4356 lines
122 KiB
C
4356 lines
122 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (C) 2011-2014 Matteo Landi
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* Copyright (C) 2011-2016 Luigi Rizzo
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* Copyright (C) 2011-2016 Giuseppe Lettieri
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* Copyright (C) 2011-2016 Vincenzo Maffione
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* $FreeBSD$
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*
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* This module supports memory mapped access to network devices,
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* see netmap(4).
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*
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* The module uses a large, memory pool allocated by the kernel
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* and accessible as mmapped memory by multiple userspace threads/processes.
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* The memory pool contains packet buffers and "netmap rings",
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* i.e. user-accessible copies of the interface's queues.
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*
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* Access to the network card works like this:
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* 1. a process/thread issues one or more open() on /dev/netmap, to create
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* select()able file descriptor on which events are reported.
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* 2. on each descriptor, the process issues an ioctl() to identify
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* the interface that should report events to the file descriptor.
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* 3. on each descriptor, the process issues an mmap() request to
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* map the shared memory region within the process' address space.
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* The list of interesting queues is indicated by a location in
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* the shared memory region.
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* 4. using the functions in the netmap(4) userspace API, a process
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* can look up the occupation state of a queue, access memory buffers,
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* and retrieve received packets or enqueue packets to transmit.
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* 5. using some ioctl()s the process can synchronize the userspace view
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* of the queue with the actual status in the kernel. This includes both
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* receiving the notification of new packets, and transmitting new
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* packets on the output interface.
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* 6. select() or poll() can be used to wait for events on individual
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* transmit or receive queues (or all queues for a given interface).
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*
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SYNCHRONIZATION (USER)
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The netmap rings and data structures may be shared among multiple
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user threads or even independent processes.
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Any synchronization among those threads/processes is delegated
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to the threads themselves. Only one thread at a time can be in
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a system call on the same netmap ring. The OS does not enforce
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this and only guarantees against system crashes in case of
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invalid usage.
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LOCKING (INTERNAL)
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Within the kernel, access to the netmap rings is protected as follows:
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- a spinlock on each ring, to handle producer/consumer races on
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RX rings attached to the host stack (against multiple host
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threads writing from the host stack to the same ring),
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and on 'destination' rings attached to a VALE switch
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(i.e. RX rings in VALE ports, and TX rings in NIC/host ports)
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protecting multiple active senders for the same destination)
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- an atomic variable to guarantee that there is at most one
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instance of *_*xsync() on the ring at any time.
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For rings connected to user file
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descriptors, an atomic_test_and_set() protects this, and the
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lock on the ring is not actually used.
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For NIC RX rings connected to a VALE switch, an atomic_test_and_set()
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is also used to prevent multiple executions (the driver might indeed
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already guarantee this).
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For NIC TX rings connected to a VALE switch, the lock arbitrates
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access to the queue (both when allocating buffers and when pushing
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them out).
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- *xsync() should be protected against initializations of the card.
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On FreeBSD most devices have the reset routine protected by
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a RING lock (ixgbe, igb, em) or core lock (re). lem is missing
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the RING protection on rx_reset(), this should be added.
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On linux there is an external lock on the tx path, which probably
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also arbitrates access to the reset routine. XXX to be revised
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- a per-interface core_lock protecting access from the host stack
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while interfaces may be detached from netmap mode.
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XXX there should be no need for this lock if we detach the interfaces
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only while they are down.
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--- VALE SWITCH ---
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NMG_LOCK() serializes all modifications to switches and ports.
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A switch cannot be deleted until all ports are gone.
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For each switch, an SX lock (RWlock on linux) protects
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deletion of ports. When configuring or deleting a new port, the
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lock is acquired in exclusive mode (after holding NMG_LOCK).
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When forwarding, the lock is acquired in shared mode (without NMG_LOCK).
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The lock is held throughout the entire forwarding cycle,
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during which the thread may incur in a page fault.
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Hence it is important that sleepable shared locks are used.
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On the rx ring, the per-port lock is grabbed initially to reserve
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a number of slot in the ring, then the lock is released,
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packets are copied from source to destination, and then
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the lock is acquired again and the receive ring is updated.
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(A similar thing is done on the tx ring for NIC and host stack
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ports attached to the switch)
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*/
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/* --- internals ----
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*
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* Roadmap to the code that implements the above.
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*
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* > 1. a process/thread issues one or more open() on /dev/netmap, to create
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* > select()able file descriptor on which events are reported.
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*
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* Internally, we allocate a netmap_priv_d structure, that will be
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* initialized on ioctl(NIOCREGIF). There is one netmap_priv_d
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* structure for each open().
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*
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* os-specific:
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* FreeBSD: see netmap_open() (netmap_freebsd.c)
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* linux: see linux_netmap_open() (netmap_linux.c)
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*
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* > 2. on each descriptor, the process issues an ioctl() to identify
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* > the interface that should report events to the file descriptor.
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*
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* Implemented by netmap_ioctl(), NIOCREGIF case, with nmr->nr_cmd==0.
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* Most important things happen in netmap_get_na() and
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* netmap_do_regif(), called from there. Additional details can be
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* found in the comments above those functions.
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*
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* In all cases, this action creates/takes-a-reference-to a
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* netmap_*_adapter describing the port, and allocates a netmap_if
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* and all necessary netmap rings, filling them with netmap buffers.
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*
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* In this phase, the sync callbacks for each ring are set (these are used
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* in steps 5 and 6 below). The callbacks depend on the type of adapter.
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* The adapter creation/initialization code puts them in the
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* netmap_adapter (fields na->nm_txsync and na->nm_rxsync). Then, they
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* are copied from there to the netmap_kring's during netmap_do_regif(), by
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* the nm_krings_create() callback. All the nm_krings_create callbacks
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* actually call netmap_krings_create() to perform this and the other
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* common stuff. netmap_krings_create() also takes care of the host rings,
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* if needed, by setting their sync callbacks appropriately.
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*
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* Additional actions depend on the kind of netmap_adapter that has been
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* registered:
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*
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* - netmap_hw_adapter: [netmap.c]
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* This is a system netdev/ifp with native netmap support.
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* The ifp is detached from the host stack by redirecting:
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* - transmissions (from the network stack) to netmap_transmit()
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* - receive notifications to the nm_notify() callback for
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* this adapter. The callback is normally netmap_notify(), unless
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* the ifp is attached to a bridge using bwrap, in which case it
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* is netmap_bwrap_intr_notify().
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*
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* - netmap_generic_adapter: [netmap_generic.c]
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* A system netdev/ifp without native netmap support.
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*
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* (the decision about native/non native support is taken in
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* netmap_get_hw_na(), called by netmap_get_na())
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*
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* - netmap_vp_adapter [netmap_vale.c]
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* Returned by netmap_get_bdg_na().
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* This is a persistent or ephemeral VALE port. Ephemeral ports
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* are created on the fly if they don't already exist, and are
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* always attached to a bridge.
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* Persistent VALE ports must must be created separately, and i
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* then attached like normal NICs. The NIOCREGIF we are examining
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* will find them only if they had previosly been created and
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* attached (see VALE_CTL below).
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*
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* - netmap_pipe_adapter [netmap_pipe.c]
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* Returned by netmap_get_pipe_na().
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* Both pipe ends are created, if they didn't already exist.
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*
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* - netmap_monitor_adapter [netmap_monitor.c]
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* Returned by netmap_get_monitor_na().
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* If successful, the nm_sync callbacks of the monitored adapter
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* will be intercepted by the returned monitor.
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*
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* - netmap_bwrap_adapter [netmap_vale.c]
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* Cannot be obtained in this way, see VALE_CTL below
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*
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*
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* os-specific:
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* linux: we first go through linux_netmap_ioctl() to
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* adapt the FreeBSD interface to the linux one.
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*
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*
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* > 3. on each descriptor, the process issues an mmap() request to
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* > map the shared memory region within the process' address space.
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* > The list of interesting queues is indicated by a location in
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* > the shared memory region.
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*
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* os-specific:
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* FreeBSD: netmap_mmap_single (netmap_freebsd.c).
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* linux: linux_netmap_mmap (netmap_linux.c).
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*
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* > 4. using the functions in the netmap(4) userspace API, a process
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* > can look up the occupation state of a queue, access memory buffers,
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* > and retrieve received packets or enqueue packets to transmit.
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*
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* these actions do not involve the kernel.
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*
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* > 5. using some ioctl()s the process can synchronize the userspace view
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* > of the queue with the actual status in the kernel. This includes both
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* > receiving the notification of new packets, and transmitting new
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* > packets on the output interface.
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*
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* These are implemented in netmap_ioctl(), NIOCTXSYNC and NIOCRXSYNC
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* cases. They invoke the nm_sync callbacks on the netmap_kring
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* structures, as initialized in step 2 and maybe later modified
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* by a monitor. Monitors, however, will always call the original
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* callback before doing anything else.
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*
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*
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* > 6. select() or poll() can be used to wait for events on individual
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* > transmit or receive queues (or all queues for a given interface).
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*
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* Implemented in netmap_poll(). This will call the same nm_sync()
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* callbacks as in step 5 above.
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*
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* os-specific:
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* linux: we first go through linux_netmap_poll() to adapt
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* the FreeBSD interface to the linux one.
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*
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*
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* ---- VALE_CTL -----
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*
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* VALE switches are controlled by issuing a NIOCREGIF with a non-null
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* nr_cmd in the nmreq structure. These subcommands are handled by
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* netmap_bdg_ctl() in netmap_vale.c. Persistent VALE ports are created
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* and destroyed by issuing the NETMAP_BDG_NEWIF and NETMAP_BDG_DELIF
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* subcommands, respectively.
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*
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* Any network interface known to the system (including a persistent VALE
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* port) can be attached to a VALE switch by issuing the
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* NETMAP_REQ_VALE_ATTACH command. After the attachment, persistent VALE ports
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* look exactly like ephemeral VALE ports (as created in step 2 above). The
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* attachment of other interfaces, instead, requires the creation of a
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* netmap_bwrap_adapter. Moreover, the attached interface must be put in
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* netmap mode. This may require the creation of a netmap_generic_adapter if
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* we have no native support for the interface, or if generic adapters have
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* been forced by sysctl.
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*
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* Both persistent VALE ports and bwraps are handled by netmap_get_bdg_na(),
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* called by nm_bdg_ctl_attach(), and discriminated by the nm_bdg_attach()
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* callback. In the case of the bwrap, the callback creates the
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* netmap_bwrap_adapter. The initialization of the bwrap is then
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* completed by calling netmap_do_regif() on it, in the nm_bdg_ctl()
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* callback (netmap_bwrap_bdg_ctl in netmap_vale.c).
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* A generic adapter for the wrapped ifp will be created if needed, when
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* netmap_get_bdg_na() calls netmap_get_hw_na().
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*
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*
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* ---- DATAPATHS -----
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*
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* -= SYSTEM DEVICE WITH NATIVE SUPPORT =-
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*
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* na == NA(ifp) == netmap_hw_adapter created in DEVICE_netmap_attach()
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*
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* - tx from netmap userspace:
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* concurrently:
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* 1) ioctl(NIOCTXSYNC)/netmap_poll() in process context
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* kring->nm_sync() == DEVICE_netmap_txsync()
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* 2) device interrupt handler
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* na->nm_notify() == netmap_notify()
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* - rx from netmap userspace:
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* concurrently:
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* 1) ioctl(NIOCRXSYNC)/netmap_poll() in process context
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* kring->nm_sync() == DEVICE_netmap_rxsync()
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* 2) device interrupt handler
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* na->nm_notify() == netmap_notify()
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* - rx from host stack
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* concurrently:
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* 1) host stack
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* netmap_transmit()
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* na->nm_notify == netmap_notify()
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* 2) ioctl(NIOCRXSYNC)/netmap_poll() in process context
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* kring->nm_sync() == netmap_rxsync_from_host
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* netmap_rxsync_from_host(na, NULL, NULL)
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* - tx to host stack
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* ioctl(NIOCTXSYNC)/netmap_poll() in process context
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* kring->nm_sync() == netmap_txsync_to_host
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* netmap_txsync_to_host(na)
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* nm_os_send_up()
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* FreeBSD: na->if_input() == ether_input()
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* linux: netif_rx() with NM_MAGIC_PRIORITY_RX
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*
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*
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* -= SYSTEM DEVICE WITH GENERIC SUPPORT =-
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*
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* na == NA(ifp) == generic_netmap_adapter created in generic_netmap_attach()
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*
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* - tx from netmap userspace:
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* concurrently:
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* 1) ioctl(NIOCTXSYNC)/netmap_poll() in process context
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* kring->nm_sync() == generic_netmap_txsync()
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* nm_os_generic_xmit_frame()
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* linux: dev_queue_xmit() with NM_MAGIC_PRIORITY_TX
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* ifp->ndo_start_xmit == generic_ndo_start_xmit()
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* gna->save_start_xmit == orig. dev. start_xmit
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* FreeBSD: na->if_transmit() == orig. dev if_transmit
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* 2) generic_mbuf_destructor()
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* na->nm_notify() == netmap_notify()
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* - rx from netmap userspace:
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* 1) ioctl(NIOCRXSYNC)/netmap_poll() in process context
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* kring->nm_sync() == generic_netmap_rxsync()
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* mbq_safe_dequeue()
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* 2) device driver
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* generic_rx_handler()
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* mbq_safe_enqueue()
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* na->nm_notify() == netmap_notify()
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* - rx from host stack
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* FreeBSD: same as native
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* Linux: same as native except:
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* 1) host stack
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* dev_queue_xmit() without NM_MAGIC_PRIORITY_TX
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* ifp->ndo_start_xmit == generic_ndo_start_xmit()
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* netmap_transmit()
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* na->nm_notify() == netmap_notify()
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* - tx to host stack (same as native):
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*
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*
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* -= VALE =-
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*
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* INCOMING:
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*
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* - VALE ports:
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* ioctl(NIOCTXSYNC)/netmap_poll() in process context
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* kring->nm_sync() == netmap_vp_txsync()
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*
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* - system device with native support:
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* from cable:
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* interrupt
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* na->nm_notify() == netmap_bwrap_intr_notify(ring_nr != host ring)
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* kring->nm_sync() == DEVICE_netmap_rxsync()
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* netmap_vp_txsync()
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* kring->nm_sync() == DEVICE_netmap_rxsync()
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* from host stack:
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* netmap_transmit()
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* na->nm_notify() == netmap_bwrap_intr_notify(ring_nr == host ring)
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* kring->nm_sync() == netmap_rxsync_from_host()
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* netmap_vp_txsync()
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*
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* - system device with generic support:
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* from device driver:
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* generic_rx_handler()
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* na->nm_notify() == netmap_bwrap_intr_notify(ring_nr != host ring)
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* kring->nm_sync() == generic_netmap_rxsync()
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* netmap_vp_txsync()
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* kring->nm_sync() == generic_netmap_rxsync()
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* from host stack:
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* netmap_transmit()
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* na->nm_notify() == netmap_bwrap_intr_notify(ring_nr == host ring)
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* kring->nm_sync() == netmap_rxsync_from_host()
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* netmap_vp_txsync()
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*
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* (all cases) --> nm_bdg_flush()
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* dest_na->nm_notify() == (see below)
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*
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* OUTGOING:
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*
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* - VALE ports:
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* concurrently:
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* 1) ioctl(NIOCRXSYNC)/netmap_poll() in process context
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* kring->nm_sync() == netmap_vp_rxsync()
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* 2) from nm_bdg_flush()
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* na->nm_notify() == netmap_notify()
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*
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* - system device with native support:
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* to cable:
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* na->nm_notify() == netmap_bwrap_notify()
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* netmap_vp_rxsync()
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* kring->nm_sync() == DEVICE_netmap_txsync()
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* netmap_vp_rxsync()
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* to host stack:
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* netmap_vp_rxsync()
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* kring->nm_sync() == netmap_txsync_to_host
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* netmap_vp_rxsync_locked()
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*
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* - system device with generic adapter:
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* to device driver:
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* na->nm_notify() == netmap_bwrap_notify()
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* netmap_vp_rxsync()
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* kring->nm_sync() == generic_netmap_txsync()
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* netmap_vp_rxsync()
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* to host stack:
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* netmap_vp_rxsync()
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* kring->nm_sync() == netmap_txsync_to_host
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* netmap_vp_rxsync()
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*
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*/
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/*
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* OS-specific code that is used only within this file.
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* Other OS-specific code that must be accessed by drivers
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* is present in netmap_kern.h
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*/
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#if defined(__FreeBSD__)
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#include <sys/cdefs.h> /* prerequisite */
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#include <sys/types.h>
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#include <sys/errno.h>
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#include <sys/param.h> /* defines used in kernel.h */
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#include <sys/kernel.h> /* types used in module initialization */
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#include <sys/conf.h> /* cdevsw struct, UID, GID */
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#include <sys/filio.h> /* FIONBIO */
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#include <sys/sockio.h>
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#include <sys/socketvar.h> /* struct socket */
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#include <sys/malloc.h>
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#include <sys/poll.h>
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#include <sys/proc.h>
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#include <sys/rwlock.h>
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#include <sys/socket.h> /* sockaddrs */
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#include <sys/selinfo.h>
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#include <sys/sysctl.h>
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#include <sys/jail.h>
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#include <sys/epoch.h>
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#include <net/vnet.h>
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#include <net/if.h>
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#include <net/if_var.h>
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#include <net/bpf.h> /* BIOCIMMEDIATE */
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#include <machine/bus.h> /* bus_dmamap_* */
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#include <sys/endian.h>
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#include <sys/refcount.h>
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#include <net/ethernet.h> /* ETHER_BPF_MTAP */
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#elif defined(linux)
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#include "bsd_glue.h"
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#elif defined(__APPLE__)
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#warning OSX support is only partial
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#include "osx_glue.h"
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#elif defined (_WIN32)
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#include "win_glue.h"
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#else
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#error Unsupported platform
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#endif /* unsupported */
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/*
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* common headers
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*/
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#include <net/netmap.h>
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#include <dev/netmap/netmap_kern.h>
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#include <dev/netmap/netmap_mem2.h>
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/* user-controlled variables */
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int netmap_verbose;
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#ifdef CONFIG_NETMAP_DEBUG
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int netmap_debug;
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#endif /* CONFIG_NETMAP_DEBUG */
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static int netmap_no_timestamp; /* don't timestamp on rxsync */
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int netmap_no_pendintr = 1;
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int netmap_txsync_retry = 2;
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static int netmap_fwd = 0; /* force transparent forwarding */
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/*
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* netmap_admode selects the netmap mode to use.
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* Invalid values are reset to NETMAP_ADMODE_BEST
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*/
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enum { NETMAP_ADMODE_BEST = 0, /* use native, fallback to generic */
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NETMAP_ADMODE_NATIVE, /* either native or none */
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NETMAP_ADMODE_GENERIC, /* force generic */
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NETMAP_ADMODE_LAST };
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static int netmap_admode = NETMAP_ADMODE_BEST;
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/* netmap_generic_mit controls mitigation of RX notifications for
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* the generic netmap adapter. The value is a time interval in
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* nanoseconds. */
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int netmap_generic_mit = 100*1000;
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/* We use by default netmap-aware qdiscs with generic netmap adapters,
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* even if there can be a little performance hit with hardware NICs.
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* However, using the qdisc is the safer approach, for two reasons:
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* 1) it prevents non-fifo qdiscs to break the TX notification
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* scheme, which is based on mbuf destructors when txqdisc is
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* not used.
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* 2) it makes it possible to transmit over software devices that
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* change skb->dev, like bridge, veth, ...
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*
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* Anyway users looking for the best performance should
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* use native adapters.
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*/
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#ifdef linux
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int netmap_generic_txqdisc = 1;
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#endif
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/* Default number of slots and queues for generic adapters. */
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int netmap_generic_ringsize = 1024;
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int netmap_generic_rings = 1;
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/* Non-zero to enable checksum offloading in NIC drivers */
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int netmap_generic_hwcsum = 0;
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/* Non-zero if ptnet devices are allowed to use virtio-net headers. */
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int ptnet_vnet_hdr = 1;
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/*
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* SYSCTL calls are grouped between SYSBEGIN and SYSEND to be emulated
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* in some other operating systems
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*/
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SYSBEGIN(main_init);
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SYSCTL_DECL(_dev_netmap);
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SYSCTL_NODE(_dev, OID_AUTO, netmap, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
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"Netmap args");
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SYSCTL_INT(_dev_netmap, OID_AUTO, verbose,
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CTLFLAG_RW, &netmap_verbose, 0, "Verbose mode");
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#ifdef CONFIG_NETMAP_DEBUG
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SYSCTL_INT(_dev_netmap, OID_AUTO, debug,
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CTLFLAG_RW, &netmap_debug, 0, "Debug messages");
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#endif /* CONFIG_NETMAP_DEBUG */
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SYSCTL_INT(_dev_netmap, OID_AUTO, no_timestamp,
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CTLFLAG_RW, &netmap_no_timestamp, 0, "no_timestamp");
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SYSCTL_INT(_dev_netmap, OID_AUTO, no_pendintr, CTLFLAG_RW, &netmap_no_pendintr,
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0, "Always look for new received packets.");
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SYSCTL_INT(_dev_netmap, OID_AUTO, txsync_retry, CTLFLAG_RW,
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&netmap_txsync_retry, 0, "Number of txsync loops in bridge's flush.");
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SYSCTL_INT(_dev_netmap, OID_AUTO, fwd, CTLFLAG_RW, &netmap_fwd, 0,
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"Force NR_FORWARD mode");
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SYSCTL_INT(_dev_netmap, OID_AUTO, admode, CTLFLAG_RW, &netmap_admode, 0,
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"Adapter mode. 0 selects the best option available,"
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"1 forces native adapter, 2 forces emulated adapter");
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SYSCTL_INT(_dev_netmap, OID_AUTO, generic_hwcsum, CTLFLAG_RW, &netmap_generic_hwcsum,
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0, "Hardware checksums. 0 to disable checksum generation by the NIC (default),"
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"1 to enable checksum generation by the NIC");
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SYSCTL_INT(_dev_netmap, OID_AUTO, generic_mit, CTLFLAG_RW, &netmap_generic_mit,
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0, "RX notification interval in nanoseconds");
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SYSCTL_INT(_dev_netmap, OID_AUTO, generic_ringsize, CTLFLAG_RW,
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&netmap_generic_ringsize, 0,
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"Number of per-ring slots for emulated netmap mode");
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SYSCTL_INT(_dev_netmap, OID_AUTO, generic_rings, CTLFLAG_RW,
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&netmap_generic_rings, 0,
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"Number of TX/RX queues for emulated netmap adapters");
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#ifdef linux
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SYSCTL_INT(_dev_netmap, OID_AUTO, generic_txqdisc, CTLFLAG_RW,
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&netmap_generic_txqdisc, 0, "Use qdisc for generic adapters");
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#endif
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SYSCTL_INT(_dev_netmap, OID_AUTO, ptnet_vnet_hdr, CTLFLAG_RW, &ptnet_vnet_hdr,
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0, "Allow ptnet devices to use virtio-net headers");
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SYSEND;
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NMG_LOCK_T netmap_global_lock;
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/*
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* mark the ring as stopped, and run through the locks
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* to make sure other users get to see it.
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* stopped must be either NR_KR_STOPPED (for unbounded stop)
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* of NR_KR_LOCKED (brief stop for mutual exclusion purposes)
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*/
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static void
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netmap_disable_ring(struct netmap_kring *kr, int stopped)
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{
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nm_kr_stop(kr, stopped);
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// XXX check if nm_kr_stop is sufficient
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mtx_lock(&kr->q_lock);
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mtx_unlock(&kr->q_lock);
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nm_kr_put(kr);
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}
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/* stop or enable a single ring */
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void
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netmap_set_ring(struct netmap_adapter *na, u_int ring_id, enum txrx t, int stopped)
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{
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if (stopped)
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netmap_disable_ring(NMR(na, t)[ring_id], stopped);
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else
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NMR(na, t)[ring_id]->nkr_stopped = 0;
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}
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/* stop or enable all the rings of na */
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void
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netmap_set_all_rings(struct netmap_adapter *na, int stopped)
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{
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int i;
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enum txrx t;
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if (!nm_netmap_on(na))
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return;
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if (netmap_verbose) {
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nm_prinf("%s: %sable all rings", na->name,
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(stopped ? "dis" : "en"));
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}
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for_rx_tx(t) {
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for (i = 0; i < netmap_real_rings(na, t); i++) {
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netmap_set_ring(na, i, t, stopped);
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}
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}
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}
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/*
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* Convenience function used in drivers. Waits for current txsync()s/rxsync()s
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* to finish and prevents any new one from starting. Call this before turning
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* netmap mode off, or before removing the hardware rings (e.g., on module
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* onload).
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*/
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void
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netmap_disable_all_rings(struct ifnet *ifp)
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{
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if (NM_NA_VALID(ifp)) {
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netmap_set_all_rings(NA(ifp), NM_KR_LOCKED);
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}
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}
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/*
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* Convenience function used in drivers. Re-enables rxsync and txsync on the
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* adapter's rings In linux drivers, this should be placed near each
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* napi_enable().
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*/
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void
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netmap_enable_all_rings(struct ifnet *ifp)
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{
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if (NM_NA_VALID(ifp)) {
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netmap_set_all_rings(NA(ifp), 0 /* enabled */);
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}
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}
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void
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netmap_make_zombie(struct ifnet *ifp)
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{
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if (NM_NA_VALID(ifp)) {
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struct netmap_adapter *na = NA(ifp);
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netmap_set_all_rings(na, NM_KR_LOCKED);
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na->na_flags |= NAF_ZOMBIE;
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netmap_set_all_rings(na, 0);
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}
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}
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void
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netmap_undo_zombie(struct ifnet *ifp)
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{
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if (NM_NA_VALID(ifp)) {
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struct netmap_adapter *na = NA(ifp);
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if (na->na_flags & NAF_ZOMBIE) {
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netmap_set_all_rings(na, NM_KR_LOCKED);
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na->na_flags &= ~NAF_ZOMBIE;
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netmap_set_all_rings(na, 0);
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}
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}
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}
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/*
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* generic bound_checking function
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*/
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u_int
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nm_bound_var(u_int *v, u_int dflt, u_int lo, u_int hi, const char *msg)
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{
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u_int oldv = *v;
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const char *op = NULL;
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if (dflt < lo)
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dflt = lo;
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if (dflt > hi)
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dflt = hi;
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if (oldv < lo) {
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*v = dflt;
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op = "Bump";
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} else if (oldv > hi) {
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*v = hi;
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op = "Clamp";
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}
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if (op && msg)
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nm_prinf("%s %s to %d (was %d)", op, msg, *v, oldv);
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return *v;
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}
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/*
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* packet-dump function, user-supplied or static buffer.
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* The destination buffer must be at least 30+4*len
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*/
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const char *
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nm_dump_buf(char *p, int len, int lim, char *dst)
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{
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static char _dst[8192];
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int i, j, i0;
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static char hex[] ="0123456789abcdef";
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char *o; /* output position */
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#define P_HI(x) hex[((x) & 0xf0)>>4]
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#define P_LO(x) hex[((x) & 0xf)]
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#define P_C(x) ((x) >= 0x20 && (x) <= 0x7e ? (x) : '.')
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if (!dst)
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dst = _dst;
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if (lim <= 0 || lim > len)
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lim = len;
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o = dst;
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sprintf(o, "buf 0x%p len %d lim %d\n", p, len, lim);
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o += strlen(o);
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/* hexdump routine */
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for (i = 0; i < lim; ) {
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sprintf(o, "%5d: ", i);
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o += strlen(o);
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memset(o, ' ', 48);
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i0 = i;
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for (j=0; j < 16 && i < lim; i++, j++) {
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o[j*3] = P_HI(p[i]);
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o[j*3+1] = P_LO(p[i]);
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}
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i = i0;
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for (j=0; j < 16 && i < lim; i++, j++)
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o[j + 48] = P_C(p[i]);
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o[j+48] = '\n';
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o += j+49;
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}
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*o = '\0';
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#undef P_HI
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#undef P_LO
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#undef P_C
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return dst;
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}
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/*
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* Fetch configuration from the device, to cope with dynamic
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* reconfigurations after loading the module.
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*/
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/* call with NMG_LOCK held */
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int
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netmap_update_config(struct netmap_adapter *na)
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{
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struct nm_config_info info;
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bzero(&info, sizeof(info));
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if (na->nm_config == NULL ||
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na->nm_config(na, &info)) {
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/* take whatever we had at init time */
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info.num_tx_rings = na->num_tx_rings;
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info.num_tx_descs = na->num_tx_desc;
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info.num_rx_rings = na->num_rx_rings;
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info.num_rx_descs = na->num_rx_desc;
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info.rx_buf_maxsize = na->rx_buf_maxsize;
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}
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if (na->num_tx_rings == info.num_tx_rings &&
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na->num_tx_desc == info.num_tx_descs &&
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na->num_rx_rings == info.num_rx_rings &&
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na->num_rx_desc == info.num_rx_descs &&
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na->rx_buf_maxsize == info.rx_buf_maxsize)
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return 0; /* nothing changed */
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if (na->active_fds == 0) {
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na->num_tx_rings = info.num_tx_rings;
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na->num_tx_desc = info.num_tx_descs;
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na->num_rx_rings = info.num_rx_rings;
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na->num_rx_desc = info.num_rx_descs;
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na->rx_buf_maxsize = info.rx_buf_maxsize;
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if (netmap_verbose)
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nm_prinf("configuration changed for %s: txring %d x %d, "
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"rxring %d x %d, rxbufsz %d",
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na->name, na->num_tx_rings, na->num_tx_desc,
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na->num_rx_rings, na->num_rx_desc, na->rx_buf_maxsize);
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return 0;
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}
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nm_prerr("WARNING: configuration changed for %s while active: "
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"txring %d x %d, rxring %d x %d, rxbufsz %d",
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na->name, info.num_tx_rings, info.num_tx_descs,
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info.num_rx_rings, info.num_rx_descs,
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info.rx_buf_maxsize);
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return 1;
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}
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/* nm_sync callbacks for the host rings */
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static int netmap_txsync_to_host(struct netmap_kring *kring, int flags);
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static int netmap_rxsync_from_host(struct netmap_kring *kring, int flags);
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/* create the krings array and initialize the fields common to all adapters.
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* The array layout is this:
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*
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* +----------+
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* na->tx_rings ----->| | \
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* | | } na->num_tx_ring
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* | | /
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* +----------+
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* | | host tx kring
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* na->rx_rings ----> +----------+
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* | | \
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* | | } na->num_rx_rings
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* | | /
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* +----------+
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* | | host rx kring
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* +----------+
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* na->tailroom ----->| | \
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* | | } tailroom bytes
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* | | /
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* +----------+
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*
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* Note: for compatibility, host krings are created even when not needed.
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* The tailroom space is currently used by vale ports for allocating leases.
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*/
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/* call with NMG_LOCK held */
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int
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netmap_krings_create(struct netmap_adapter *na, u_int tailroom)
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{
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u_int i, len, ndesc;
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struct netmap_kring *kring;
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u_int n[NR_TXRX];
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enum txrx t;
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int err = 0;
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if (na->tx_rings != NULL) {
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if (netmap_debug & NM_DEBUG_ON)
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nm_prerr("warning: krings were already created");
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return 0;
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}
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|
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/* account for the (possibly fake) host rings */
|
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n[NR_TX] = netmap_all_rings(na, NR_TX);
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n[NR_RX] = netmap_all_rings(na, NR_RX);
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len = (n[NR_TX] + n[NR_RX]) *
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(sizeof(struct netmap_kring) + sizeof(struct netmap_kring *))
|
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+ tailroom;
|
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|
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na->tx_rings = nm_os_malloc((size_t)len);
|
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if (na->tx_rings == NULL) {
|
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nm_prerr("Cannot allocate krings");
|
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return ENOMEM;
|
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}
|
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na->rx_rings = na->tx_rings + n[NR_TX];
|
|
na->tailroom = na->rx_rings + n[NR_RX];
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|
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/* link the krings in the krings array */
|
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kring = (struct netmap_kring *)((char *)na->tailroom + tailroom);
|
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for (i = 0; i < n[NR_TX] + n[NR_RX]; i++) {
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na->tx_rings[i] = kring;
|
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kring++;
|
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}
|
|
|
|
/*
|
|
* All fields in krings are 0 except the one initialized below.
|
|
* but better be explicit on important kring fields.
|
|
*/
|
|
for_rx_tx(t) {
|
|
ndesc = nma_get_ndesc(na, t);
|
|
for (i = 0; i < n[t]; i++) {
|
|
kring = NMR(na, t)[i];
|
|
bzero(kring, sizeof(*kring));
|
|
kring->notify_na = na;
|
|
kring->ring_id = i;
|
|
kring->tx = t;
|
|
kring->nkr_num_slots = ndesc;
|
|
kring->nr_mode = NKR_NETMAP_OFF;
|
|
kring->nr_pending_mode = NKR_NETMAP_OFF;
|
|
if (i < nma_get_nrings(na, t)) {
|
|
kring->nm_sync = (t == NR_TX ? na->nm_txsync : na->nm_rxsync);
|
|
} else {
|
|
if (!(na->na_flags & NAF_HOST_RINGS))
|
|
kring->nr_kflags |= NKR_FAKERING;
|
|
kring->nm_sync = (t == NR_TX ?
|
|
netmap_txsync_to_host:
|
|
netmap_rxsync_from_host);
|
|
}
|
|
kring->nm_notify = na->nm_notify;
|
|
kring->rhead = kring->rcur = kring->nr_hwcur = 0;
|
|
/*
|
|
* IMPORTANT: Always keep one slot empty.
|
|
*/
|
|
kring->rtail = kring->nr_hwtail = (t == NR_TX ? ndesc - 1 : 0);
|
|
snprintf(kring->name, sizeof(kring->name) - 1, "%s %s%d", na->name,
|
|
nm_txrx2str(t), i);
|
|
nm_prdis("ktx %s h %d c %d t %d",
|
|
kring->name, kring->rhead, kring->rcur, kring->rtail);
|
|
err = nm_os_selinfo_init(&kring->si, kring->name);
|
|
if (err) {
|
|
netmap_krings_delete(na);
|
|
return err;
|
|
}
|
|
mtx_init(&kring->q_lock, (t == NR_TX ? "nm_txq_lock" : "nm_rxq_lock"), NULL, MTX_DEF);
|
|
kring->na = na; /* setting this field marks the mutex as initialized */
|
|
}
|
|
err = nm_os_selinfo_init(&na->si[t], na->name);
|
|
if (err) {
|
|
netmap_krings_delete(na);
|
|
return err;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
/* undo the actions performed by netmap_krings_create */
|
|
/* call with NMG_LOCK held */
|
|
void
|
|
netmap_krings_delete(struct netmap_adapter *na)
|
|
{
|
|
struct netmap_kring **kring = na->tx_rings;
|
|
enum txrx t;
|
|
|
|
if (na->tx_rings == NULL) {
|
|
if (netmap_debug & NM_DEBUG_ON)
|
|
nm_prerr("warning: krings were already deleted");
|
|
return;
|
|
}
|
|
|
|
for_rx_tx(t)
|
|
nm_os_selinfo_uninit(&na->si[t]);
|
|
|
|
/* we rely on the krings layout described above */
|
|
for ( ; kring != na->tailroom; kring++) {
|
|
if ((*kring)->na != NULL)
|
|
mtx_destroy(&(*kring)->q_lock);
|
|
nm_os_selinfo_uninit(&(*kring)->si);
|
|
}
|
|
nm_os_free(na->tx_rings);
|
|
na->tx_rings = na->rx_rings = na->tailroom = NULL;
|
|
}
|
|
|
|
|
|
/*
|
|
* Destructor for NIC ports. They also have an mbuf queue
|
|
* on the rings connected to the host so we need to purge
|
|
* them first.
|
|
*/
|
|
/* call with NMG_LOCK held */
|
|
void
|
|
netmap_hw_krings_delete(struct netmap_adapter *na)
|
|
{
|
|
u_int lim = netmap_real_rings(na, NR_RX), i;
|
|
|
|
for (i = nma_get_nrings(na, NR_RX); i < lim; i++) {
|
|
struct mbq *q = &NMR(na, NR_RX)[i]->rx_queue;
|
|
nm_prdis("destroy sw mbq with len %d", mbq_len(q));
|
|
mbq_purge(q);
|
|
mbq_safe_fini(q);
|
|
}
|
|
netmap_krings_delete(na);
|
|
}
|
|
|
|
static void
|
|
netmap_mem_drop(struct netmap_adapter *na)
|
|
{
|
|
int last = netmap_mem_deref(na->nm_mem, na);
|
|
/* if the native allocator had been overrided on regif,
|
|
* restore it now and drop the temporary one
|
|
*/
|
|
if (last && na->nm_mem_prev) {
|
|
netmap_mem_put(na->nm_mem);
|
|
na->nm_mem = na->nm_mem_prev;
|
|
na->nm_mem_prev = NULL;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Undo everything that was done in netmap_do_regif(). In particular,
|
|
* call nm_register(ifp,0) to stop netmap mode on the interface and
|
|
* revert to normal operation.
|
|
*/
|
|
/* call with NMG_LOCK held */
|
|
static void netmap_unset_ringid(struct netmap_priv_d *);
|
|
static void netmap_krings_put(struct netmap_priv_d *);
|
|
void
|
|
netmap_do_unregif(struct netmap_priv_d *priv)
|
|
{
|
|
struct netmap_adapter *na = priv->np_na;
|
|
|
|
NMG_LOCK_ASSERT();
|
|
na->active_fds--;
|
|
/* unset nr_pending_mode and possibly release exclusive mode */
|
|
netmap_krings_put(priv);
|
|
|
|
#ifdef WITH_MONITOR
|
|
/* XXX check whether we have to do something with monitor
|
|
* when rings change nr_mode. */
|
|
if (na->active_fds <= 0) {
|
|
/* walk through all the rings and tell any monitor
|
|
* that the port is going to exit netmap mode
|
|
*/
|
|
netmap_monitor_stop(na);
|
|
}
|
|
#endif
|
|
|
|
if (na->active_fds <= 0 || nm_kring_pending(priv)) {
|
|
na->nm_register(na, 0);
|
|
}
|
|
|
|
/* delete rings and buffers that are no longer needed */
|
|
netmap_mem_rings_delete(na);
|
|
|
|
if (na->active_fds <= 0) { /* last instance */
|
|
/*
|
|
* (TO CHECK) We enter here
|
|
* when the last reference to this file descriptor goes
|
|
* away. This means we cannot have any pending poll()
|
|
* or interrupt routine operating on the structure.
|
|
* XXX The file may be closed in a thread while
|
|
* another thread is using it.
|
|
* Linux keeps the file opened until the last reference
|
|
* by any outstanding ioctl/poll or mmap is gone.
|
|
* FreeBSD does not track mmap()s (but we do) and
|
|
* wakes up any sleeping poll(). Need to check what
|
|
* happens if the close() occurs while a concurrent
|
|
* syscall is running.
|
|
*/
|
|
if (netmap_debug & NM_DEBUG_ON)
|
|
nm_prinf("deleting last instance for %s", na->name);
|
|
|
|
if (nm_netmap_on(na)) {
|
|
nm_prerr("BUG: netmap on while going to delete the krings");
|
|
}
|
|
|
|
na->nm_krings_delete(na);
|
|
|
|
/* restore the default number of host tx and rx rings */
|
|
if (na->na_flags & NAF_HOST_RINGS) {
|
|
na->num_host_tx_rings = 1;
|
|
na->num_host_rx_rings = 1;
|
|
} else {
|
|
na->num_host_tx_rings = 0;
|
|
na->num_host_rx_rings = 0;
|
|
}
|
|
}
|
|
|
|
/* possibily decrement counter of tx_si/rx_si users */
|
|
netmap_unset_ringid(priv);
|
|
/* delete the nifp */
|
|
netmap_mem_if_delete(na, priv->np_nifp);
|
|
/* drop the allocator */
|
|
netmap_mem_drop(na);
|
|
/* mark the priv as unregistered */
|
|
priv->np_na = NULL;
|
|
priv->np_nifp = NULL;
|
|
}
|
|
|
|
struct netmap_priv_d*
|
|
netmap_priv_new(void)
|
|
{
|
|
struct netmap_priv_d *priv;
|
|
|
|
priv = nm_os_malloc(sizeof(struct netmap_priv_d));
|
|
if (priv == NULL)
|
|
return NULL;
|
|
priv->np_refs = 1;
|
|
nm_os_get_module();
|
|
return priv;
|
|
}
|
|
|
|
/*
|
|
* Destructor of the netmap_priv_d, called when the fd is closed
|
|
* Action: undo all the things done by NIOCREGIF,
|
|
* On FreeBSD we need to track whether there are active mmap()s,
|
|
* and we use np_active_mmaps for that. On linux, the field is always 0.
|
|
* Return: 1 if we can free priv, 0 otherwise.
|
|
*
|
|
*/
|
|
/* call with NMG_LOCK held */
|
|
void
|
|
netmap_priv_delete(struct netmap_priv_d *priv)
|
|
{
|
|
struct netmap_adapter *na = priv->np_na;
|
|
|
|
/* number of active references to this fd */
|
|
if (--priv->np_refs > 0) {
|
|
return;
|
|
}
|
|
nm_os_put_module();
|
|
if (na) {
|
|
netmap_do_unregif(priv);
|
|
}
|
|
netmap_unget_na(na, priv->np_ifp);
|
|
bzero(priv, sizeof(*priv)); /* for safety */
|
|
nm_os_free(priv);
|
|
}
|
|
|
|
|
|
/* call with NMG_LOCK *not* held */
|
|
void
|
|
netmap_dtor(void *data)
|
|
{
|
|
struct netmap_priv_d *priv = data;
|
|
|
|
NMG_LOCK();
|
|
netmap_priv_delete(priv);
|
|
NMG_UNLOCK();
|
|
}
|
|
|
|
|
|
/*
|
|
* Handlers for synchronization of the rings from/to the host stack.
|
|
* These are associated to a network interface and are just another
|
|
* ring pair managed by userspace.
|
|
*
|
|
* Netmap also supports transparent forwarding (NS_FORWARD and NR_FORWARD
|
|
* flags):
|
|
*
|
|
* - Before releasing buffers on hw RX rings, the application can mark
|
|
* them with the NS_FORWARD flag. During the next RXSYNC or poll(), they
|
|
* will be forwarded to the host stack, similarly to what happened if
|
|
* the application moved them to the host TX ring.
|
|
*
|
|
* - Before releasing buffers on the host RX ring, the application can
|
|
* mark them with the NS_FORWARD flag. During the next RXSYNC or poll(),
|
|
* they will be forwarded to the hw TX rings, saving the application
|
|
* from doing the same task in user-space.
|
|
*
|
|
* Transparent fowarding can be enabled per-ring, by setting the NR_FORWARD
|
|
* flag, or globally with the netmap_fwd sysctl.
|
|
*
|
|
* The transfer NIC --> host is relatively easy, just encapsulate
|
|
* into mbufs and we are done. The host --> NIC side is slightly
|
|
* harder because there might not be room in the tx ring so it
|
|
* might take a while before releasing the buffer.
|
|
*/
|
|
|
|
|
|
/*
|
|
* Pass a whole queue of mbufs to the host stack as coming from 'dst'
|
|
* We do not need to lock because the queue is private.
|
|
* After this call the queue is empty.
|
|
*/
|
|
static void
|
|
netmap_send_up(struct ifnet *dst, struct mbq *q)
|
|
{
|
|
struct mbuf *m;
|
|
struct mbuf *head = NULL, *prev = NULL;
|
|
#ifdef __FreeBSD__
|
|
struct epoch_tracker et;
|
|
|
|
NET_EPOCH_ENTER(et);
|
|
#endif /* __FreeBSD__ */
|
|
/* Send packets up, outside the lock; head/prev machinery
|
|
* is only useful for Windows. */
|
|
while ((m = mbq_dequeue(q)) != NULL) {
|
|
if (netmap_debug & NM_DEBUG_HOST)
|
|
nm_prinf("sending up pkt %p size %d", m, MBUF_LEN(m));
|
|
prev = nm_os_send_up(dst, m, prev);
|
|
if (head == NULL)
|
|
head = prev;
|
|
}
|
|
if (head)
|
|
nm_os_send_up(dst, NULL, head);
|
|
#ifdef __FreeBSD__
|
|
NET_EPOCH_EXIT(et);
|
|
#endif /* __FreeBSD__ */
|
|
mbq_fini(q);
|
|
}
|
|
|
|
|
|
/*
|
|
* Scan the buffers from hwcur to ring->head, and put a copy of those
|
|
* marked NS_FORWARD (or all of them if forced) into a queue of mbufs.
|
|
* Drop remaining packets in the unlikely event
|
|
* of an mbuf shortage.
|
|
*/
|
|
static void
|
|
netmap_grab_packets(struct netmap_kring *kring, struct mbq *q, int force)
|
|
{
|
|
u_int const lim = kring->nkr_num_slots - 1;
|
|
u_int const head = kring->rhead;
|
|
u_int n;
|
|
struct netmap_adapter *na = kring->na;
|
|
|
|
for (n = kring->nr_hwcur; n != head; n = nm_next(n, lim)) {
|
|
struct mbuf *m;
|
|
struct netmap_slot *slot = &kring->ring->slot[n];
|
|
|
|
if ((slot->flags & NS_FORWARD) == 0 && !force)
|
|
continue;
|
|
if (slot->len < 14 || slot->len > NETMAP_BUF_SIZE(na)) {
|
|
nm_prlim(5, "bad pkt at %d len %d", n, slot->len);
|
|
continue;
|
|
}
|
|
slot->flags &= ~NS_FORWARD; // XXX needed ?
|
|
/* XXX TODO: adapt to the case of a multisegment packet */
|
|
m = m_devget(NMB(na, slot), slot->len, 0, na->ifp, NULL);
|
|
|
|
if (m == NULL)
|
|
break;
|
|
mbq_enqueue(q, m);
|
|
}
|
|
}
|
|
|
|
static inline int
|
|
_nm_may_forward(struct netmap_kring *kring)
|
|
{
|
|
return ((netmap_fwd || kring->ring->flags & NR_FORWARD) &&
|
|
kring->na->na_flags & NAF_HOST_RINGS &&
|
|
kring->tx == NR_RX);
|
|
}
|
|
|
|
static inline int
|
|
nm_may_forward_up(struct netmap_kring *kring)
|
|
{
|
|
return _nm_may_forward(kring) &&
|
|
kring->ring_id != kring->na->num_rx_rings;
|
|
}
|
|
|
|
static inline int
|
|
nm_may_forward_down(struct netmap_kring *kring, int sync_flags)
|
|
{
|
|
return _nm_may_forward(kring) &&
|
|
(sync_flags & NAF_CAN_FORWARD_DOWN) &&
|
|
kring->ring_id == kring->na->num_rx_rings;
|
|
}
|
|
|
|
/*
|
|
* Send to the NIC rings packets marked NS_FORWARD between
|
|
* kring->nr_hwcur and kring->rhead.
|
|
* Called under kring->rx_queue.lock on the sw rx ring.
|
|
*
|
|
* It can only be called if the user opened all the TX hw rings,
|
|
* see NAF_CAN_FORWARD_DOWN flag.
|
|
* We can touch the TX netmap rings (slots, head and cur) since
|
|
* we are in poll/ioctl system call context, and the application
|
|
* is not supposed to touch the ring (using a different thread)
|
|
* during the execution of the system call.
|
|
*/
|
|
static u_int
|
|
netmap_sw_to_nic(struct netmap_adapter *na)
|
|
{
|
|
struct netmap_kring *kring = na->rx_rings[na->num_rx_rings];
|
|
struct netmap_slot *rxslot = kring->ring->slot;
|
|
u_int i, rxcur = kring->nr_hwcur;
|
|
u_int const head = kring->rhead;
|
|
u_int const src_lim = kring->nkr_num_slots - 1;
|
|
u_int sent = 0;
|
|
|
|
/* scan rings to find space, then fill as much as possible */
|
|
for (i = 0; i < na->num_tx_rings; i++) {
|
|
struct netmap_kring *kdst = na->tx_rings[i];
|
|
struct netmap_ring *rdst = kdst->ring;
|
|
u_int const dst_lim = kdst->nkr_num_slots - 1;
|
|
|
|
/* XXX do we trust ring or kring->rcur,rtail ? */
|
|
for (; rxcur != head && !nm_ring_empty(rdst);
|
|
rxcur = nm_next(rxcur, src_lim) ) {
|
|
struct netmap_slot *src, *dst, tmp;
|
|
u_int dst_head = rdst->head;
|
|
|
|
src = &rxslot[rxcur];
|
|
if ((src->flags & NS_FORWARD) == 0 && !netmap_fwd)
|
|
continue;
|
|
|
|
sent++;
|
|
|
|
dst = &rdst->slot[dst_head];
|
|
|
|
tmp = *src;
|
|
|
|
src->buf_idx = dst->buf_idx;
|
|
src->flags = NS_BUF_CHANGED;
|
|
|
|
dst->buf_idx = tmp.buf_idx;
|
|
dst->len = tmp.len;
|
|
dst->flags = NS_BUF_CHANGED;
|
|
|
|
rdst->head = rdst->cur = nm_next(dst_head, dst_lim);
|
|
}
|
|
/* if (sent) XXX txsync ? it would be just an optimization */
|
|
}
|
|
return sent;
|
|
}
|
|
|
|
|
|
/*
|
|
* netmap_txsync_to_host() passes packets up. We are called from a
|
|
* system call in user process context, and the only contention
|
|
* can be among multiple user threads erroneously calling
|
|
* this routine concurrently.
|
|
*/
|
|
static int
|
|
netmap_txsync_to_host(struct netmap_kring *kring, int flags)
|
|
{
|
|
struct netmap_adapter *na = kring->na;
|
|
u_int const lim = kring->nkr_num_slots - 1;
|
|
u_int const head = kring->rhead;
|
|
struct mbq q;
|
|
|
|
/* Take packets from hwcur to head and pass them up.
|
|
* Force hwcur = head since netmap_grab_packets() stops at head
|
|
*/
|
|
mbq_init(&q);
|
|
netmap_grab_packets(kring, &q, 1 /* force */);
|
|
nm_prdis("have %d pkts in queue", mbq_len(&q));
|
|
kring->nr_hwcur = head;
|
|
kring->nr_hwtail = head + lim;
|
|
if (kring->nr_hwtail > lim)
|
|
kring->nr_hwtail -= lim + 1;
|
|
|
|
netmap_send_up(na->ifp, &q);
|
|
return 0;
|
|
}
|
|
|
|
|
|
/*
|
|
* rxsync backend for packets coming from the host stack.
|
|
* They have been put in kring->rx_queue by netmap_transmit().
|
|
* We protect access to the kring using kring->rx_queue.lock
|
|
*
|
|
* also moves to the nic hw rings any packet the user has marked
|
|
* for transparent-mode forwarding, then sets the NR_FORWARD
|
|
* flag in the kring to let the caller push them out
|
|
*/
|
|
static int
|
|
netmap_rxsync_from_host(struct netmap_kring *kring, int flags)
|
|
{
|
|
struct netmap_adapter *na = kring->na;
|
|
struct netmap_ring *ring = kring->ring;
|
|
u_int nm_i, n;
|
|
u_int const lim = kring->nkr_num_slots - 1;
|
|
u_int const head = kring->rhead;
|
|
int ret = 0;
|
|
struct mbq *q = &kring->rx_queue, fq;
|
|
|
|
mbq_init(&fq); /* fq holds packets to be freed */
|
|
|
|
mbq_lock(q);
|
|
|
|
/* First part: import newly received packets */
|
|
n = mbq_len(q);
|
|
if (n) { /* grab packets from the queue */
|
|
struct mbuf *m;
|
|
uint32_t stop_i;
|
|
|
|
nm_i = kring->nr_hwtail;
|
|
stop_i = nm_prev(kring->nr_hwcur, lim);
|
|
while ( nm_i != stop_i && (m = mbq_dequeue(q)) != NULL ) {
|
|
int len = MBUF_LEN(m);
|
|
struct netmap_slot *slot = &ring->slot[nm_i];
|
|
|
|
m_copydata(m, 0, len, NMB(na, slot));
|
|
nm_prdis("nm %d len %d", nm_i, len);
|
|
if (netmap_debug & NM_DEBUG_HOST)
|
|
nm_prinf("%s", nm_dump_buf(NMB(na, slot),len, 128, NULL));
|
|
|
|
slot->len = len;
|
|
slot->flags = 0;
|
|
nm_i = nm_next(nm_i, lim);
|
|
mbq_enqueue(&fq, m);
|
|
}
|
|
kring->nr_hwtail = nm_i;
|
|
}
|
|
|
|
/*
|
|
* Second part: skip past packets that userspace has released.
|
|
*/
|
|
nm_i = kring->nr_hwcur;
|
|
if (nm_i != head) { /* something was released */
|
|
if (nm_may_forward_down(kring, flags)) {
|
|
ret = netmap_sw_to_nic(na);
|
|
if (ret > 0) {
|
|
kring->nr_kflags |= NR_FORWARD;
|
|
ret = 0;
|
|
}
|
|
}
|
|
kring->nr_hwcur = head;
|
|
}
|
|
|
|
mbq_unlock(q);
|
|
|
|
mbq_purge(&fq);
|
|
mbq_fini(&fq);
|
|
|
|
return ret;
|
|
}
|
|
|
|
|
|
/* Get a netmap adapter for the port.
|
|
*
|
|
* If it is possible to satisfy the request, return 0
|
|
* with *na containing the netmap adapter found.
|
|
* Otherwise return an error code, with *na containing NULL.
|
|
*
|
|
* When the port is attached to a bridge, we always return
|
|
* EBUSY.
|
|
* Otherwise, if the port is already bound to a file descriptor,
|
|
* then we unconditionally return the existing adapter into *na.
|
|
* In all the other cases, we return (into *na) either native,
|
|
* generic or NULL, according to the following table:
|
|
*
|
|
* native_support
|
|
* active_fds dev.netmap.admode YES NO
|
|
* -------------------------------------------------------
|
|
* >0 * NA(ifp) NA(ifp)
|
|
*
|
|
* 0 NETMAP_ADMODE_BEST NATIVE GENERIC
|
|
* 0 NETMAP_ADMODE_NATIVE NATIVE NULL
|
|
* 0 NETMAP_ADMODE_GENERIC GENERIC GENERIC
|
|
*
|
|
*/
|
|
static void netmap_hw_dtor(struct netmap_adapter *); /* needed by NM_IS_NATIVE() */
|
|
int
|
|
netmap_get_hw_na(struct ifnet *ifp, struct netmap_mem_d *nmd, struct netmap_adapter **na)
|
|
{
|
|
/* generic support */
|
|
int i = netmap_admode; /* Take a snapshot. */
|
|
struct netmap_adapter *prev_na;
|
|
int error = 0;
|
|
|
|
*na = NULL; /* default */
|
|
|
|
/* reset in case of invalid value */
|
|
if (i < NETMAP_ADMODE_BEST || i >= NETMAP_ADMODE_LAST)
|
|
i = netmap_admode = NETMAP_ADMODE_BEST;
|
|
|
|
if (NM_NA_VALID(ifp)) {
|
|
prev_na = NA(ifp);
|
|
/* If an adapter already exists, return it if
|
|
* there are active file descriptors or if
|
|
* netmap is not forced to use generic
|
|
* adapters.
|
|
*/
|
|
if (NETMAP_OWNED_BY_ANY(prev_na)
|
|
|| i != NETMAP_ADMODE_GENERIC
|
|
|| prev_na->na_flags & NAF_FORCE_NATIVE
|
|
#ifdef WITH_PIPES
|
|
/* ugly, but we cannot allow an adapter switch
|
|
* if some pipe is referring to this one
|
|
*/
|
|
|| prev_na->na_next_pipe > 0
|
|
#endif
|
|
) {
|
|
*na = prev_na;
|
|
goto assign_mem;
|
|
}
|
|
}
|
|
|
|
/* If there isn't native support and netmap is not allowed
|
|
* to use generic adapters, we cannot satisfy the request.
|
|
*/
|
|
if (!NM_IS_NATIVE(ifp) && i == NETMAP_ADMODE_NATIVE)
|
|
return EOPNOTSUPP;
|
|
|
|
/* Otherwise, create a generic adapter and return it,
|
|
* saving the previously used netmap adapter, if any.
|
|
*
|
|
* Note that here 'prev_na', if not NULL, MUST be a
|
|
* native adapter, and CANNOT be a generic one. This is
|
|
* true because generic adapters are created on demand, and
|
|
* destroyed when not used anymore. Therefore, if the adapter
|
|
* currently attached to an interface 'ifp' is generic, it
|
|
* must be that
|
|
* (NA(ifp)->active_fds > 0 || NETMAP_OWNED_BY_KERN(NA(ifp))).
|
|
* Consequently, if NA(ifp) is generic, we will enter one of
|
|
* the branches above. This ensures that we never override
|
|
* a generic adapter with another generic adapter.
|
|
*/
|
|
error = generic_netmap_attach(ifp);
|
|
if (error)
|
|
return error;
|
|
|
|
*na = NA(ifp);
|
|
|
|
assign_mem:
|
|
if (nmd != NULL && !((*na)->na_flags & NAF_MEM_OWNER) &&
|
|
(*na)->active_fds == 0 && ((*na)->nm_mem != nmd)) {
|
|
(*na)->nm_mem_prev = (*na)->nm_mem;
|
|
(*na)->nm_mem = netmap_mem_get(nmd);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* MUST BE CALLED UNDER NMG_LOCK()
|
|
*
|
|
* Get a refcounted reference to a netmap adapter attached
|
|
* to the interface specified by req.
|
|
* This is always called in the execution of an ioctl().
|
|
*
|
|
* Return ENXIO if the interface specified by the request does
|
|
* not exist, ENOTSUP if netmap is not supported by the interface,
|
|
* EBUSY if the interface is already attached to a bridge,
|
|
* EINVAL if parameters are invalid, ENOMEM if needed resources
|
|
* could not be allocated.
|
|
* If successful, hold a reference to the netmap adapter.
|
|
*
|
|
* If the interface specified by req is a system one, also keep
|
|
* a reference to it and return a valid *ifp.
|
|
*/
|
|
int
|
|
netmap_get_na(struct nmreq_header *hdr,
|
|
struct netmap_adapter **na, struct ifnet **ifp,
|
|
struct netmap_mem_d *nmd, int create)
|
|
{
|
|
struct nmreq_register *req = (struct nmreq_register *)(uintptr_t)hdr->nr_body;
|
|
int error = 0;
|
|
struct netmap_adapter *ret = NULL;
|
|
int nmd_ref = 0;
|
|
|
|
*na = NULL; /* default return value */
|
|
*ifp = NULL;
|
|
|
|
if (hdr->nr_reqtype != NETMAP_REQ_REGISTER) {
|
|
return EINVAL;
|
|
}
|
|
|
|
if (req->nr_mode == NR_REG_PIPE_MASTER ||
|
|
req->nr_mode == NR_REG_PIPE_SLAVE) {
|
|
/* Do not accept deprecated pipe modes. */
|
|
nm_prerr("Deprecated pipe nr_mode, use xx{yy or xx}yy syntax");
|
|
return EINVAL;
|
|
}
|
|
|
|
NMG_LOCK_ASSERT();
|
|
|
|
/* if the request contain a memid, try to find the
|
|
* corresponding memory region
|
|
*/
|
|
if (nmd == NULL && req->nr_mem_id) {
|
|
nmd = netmap_mem_find(req->nr_mem_id);
|
|
if (nmd == NULL)
|
|
return EINVAL;
|
|
/* keep the rereference */
|
|
nmd_ref = 1;
|
|
}
|
|
|
|
/* We cascade through all possible types of netmap adapter.
|
|
* All netmap_get_*_na() functions return an error and an na,
|
|
* with the following combinations:
|
|
*
|
|
* error na
|
|
* 0 NULL type doesn't match
|
|
* !0 NULL type matches, but na creation/lookup failed
|
|
* 0 !NULL type matches and na created/found
|
|
* !0 !NULL impossible
|
|
*/
|
|
error = netmap_get_null_na(hdr, na, nmd, create);
|
|
if (error || *na != NULL)
|
|
goto out;
|
|
|
|
/* try to see if this is a monitor port */
|
|
error = netmap_get_monitor_na(hdr, na, nmd, create);
|
|
if (error || *na != NULL)
|
|
goto out;
|
|
|
|
/* try to see if this is a pipe port */
|
|
error = netmap_get_pipe_na(hdr, na, nmd, create);
|
|
if (error || *na != NULL)
|
|
goto out;
|
|
|
|
/* try to see if this is a bridge port */
|
|
error = netmap_get_vale_na(hdr, na, nmd, create);
|
|
if (error)
|
|
goto out;
|
|
|
|
if (*na != NULL) /* valid match in netmap_get_bdg_na() */
|
|
goto out;
|
|
|
|
/*
|
|
* This must be a hardware na, lookup the name in the system.
|
|
* Note that by hardware we actually mean "it shows up in ifconfig".
|
|
* This may still be a tap, a veth/epair, or even a
|
|
* persistent VALE port.
|
|
*/
|
|
*ifp = ifunit_ref(hdr->nr_name);
|
|
if (*ifp == NULL) {
|
|
error = ENXIO;
|
|
goto out;
|
|
}
|
|
|
|
error = netmap_get_hw_na(*ifp, nmd, &ret);
|
|
if (error)
|
|
goto out;
|
|
|
|
*na = ret;
|
|
netmap_adapter_get(ret);
|
|
|
|
/*
|
|
* if the adapter supports the host rings and it is not alread open,
|
|
* try to set the number of host rings as requested by the user
|
|
*/
|
|
if (((*na)->na_flags & NAF_HOST_RINGS) && (*na)->active_fds == 0) {
|
|
if (req->nr_host_tx_rings)
|
|
(*na)->num_host_tx_rings = req->nr_host_tx_rings;
|
|
if (req->nr_host_rx_rings)
|
|
(*na)->num_host_rx_rings = req->nr_host_rx_rings;
|
|
}
|
|
nm_prdis("%s: host tx %d rx %u", (*na)->name, (*na)->num_host_tx_rings,
|
|
(*na)->num_host_rx_rings);
|
|
|
|
out:
|
|
if (error) {
|
|
if (ret)
|
|
netmap_adapter_put(ret);
|
|
if (*ifp) {
|
|
if_rele(*ifp);
|
|
*ifp = NULL;
|
|
}
|
|
}
|
|
if (nmd_ref)
|
|
netmap_mem_put(nmd);
|
|
|
|
return error;
|
|
}
|
|
|
|
/* undo netmap_get_na() */
|
|
void
|
|
netmap_unget_na(struct netmap_adapter *na, struct ifnet *ifp)
|
|
{
|
|
if (ifp)
|
|
if_rele(ifp);
|
|
if (na)
|
|
netmap_adapter_put(na);
|
|
}
|
|
|
|
|
|
#define NM_FAIL_ON(t) do { \
|
|
if (unlikely(t)) { \
|
|
nm_prlim(5, "%s: fail '" #t "' " \
|
|
"h %d c %d t %d " \
|
|
"rh %d rc %d rt %d " \
|
|
"hc %d ht %d", \
|
|
kring->name, \
|
|
head, cur, ring->tail, \
|
|
kring->rhead, kring->rcur, kring->rtail, \
|
|
kring->nr_hwcur, kring->nr_hwtail); \
|
|
return kring->nkr_num_slots; \
|
|
} \
|
|
} while (0)
|
|
|
|
/*
|
|
* validate parameters on entry for *_txsync()
|
|
* Returns ring->cur if ok, or something >= kring->nkr_num_slots
|
|
* in case of error.
|
|
*
|
|
* rhead, rcur and rtail=hwtail are stored from previous round.
|
|
* hwcur is the next packet to send to the ring.
|
|
*
|
|
* We want
|
|
* hwcur <= *rhead <= head <= cur <= tail = *rtail <= hwtail
|
|
*
|
|
* hwcur, rhead, rtail and hwtail are reliable
|
|
*/
|
|
u_int
|
|
nm_txsync_prologue(struct netmap_kring *kring, struct netmap_ring *ring)
|
|
{
|
|
u_int head = ring->head; /* read only once */
|
|
u_int cur = ring->cur; /* read only once */
|
|
u_int n = kring->nkr_num_slots;
|
|
|
|
nm_prdis(5, "%s kcur %d ktail %d head %d cur %d tail %d",
|
|
kring->name,
|
|
kring->nr_hwcur, kring->nr_hwtail,
|
|
ring->head, ring->cur, ring->tail);
|
|
#if 1 /* kernel sanity checks; but we can trust the kring. */
|
|
NM_FAIL_ON(kring->nr_hwcur >= n || kring->rhead >= n ||
|
|
kring->rtail >= n || kring->nr_hwtail >= n);
|
|
#endif /* kernel sanity checks */
|
|
/*
|
|
* user sanity checks. We only use head,
|
|
* A, B, ... are possible positions for head:
|
|
*
|
|
* 0 A rhead B rtail C n-1
|
|
* 0 D rtail E rhead F n-1
|
|
*
|
|
* B, F, D are valid. A, C, E are wrong
|
|
*/
|
|
if (kring->rtail >= kring->rhead) {
|
|
/* want rhead <= head <= rtail */
|
|
NM_FAIL_ON(head < kring->rhead || head > kring->rtail);
|
|
/* and also head <= cur <= rtail */
|
|
NM_FAIL_ON(cur < head || cur > kring->rtail);
|
|
} else { /* here rtail < rhead */
|
|
/* we need head outside rtail .. rhead */
|
|
NM_FAIL_ON(head > kring->rtail && head < kring->rhead);
|
|
|
|
/* two cases now: head <= rtail or head >= rhead */
|
|
if (head <= kring->rtail) {
|
|
/* want head <= cur <= rtail */
|
|
NM_FAIL_ON(cur < head || cur > kring->rtail);
|
|
} else { /* head >= rhead */
|
|
/* cur must be outside rtail..head */
|
|
NM_FAIL_ON(cur > kring->rtail && cur < head);
|
|
}
|
|
}
|
|
if (ring->tail != kring->rtail) {
|
|
nm_prlim(5, "%s tail overwritten was %d need %d", kring->name,
|
|
ring->tail, kring->rtail);
|
|
ring->tail = kring->rtail;
|
|
}
|
|
kring->rhead = head;
|
|
kring->rcur = cur;
|
|
return head;
|
|
}
|
|
|
|
|
|
/*
|
|
* validate parameters on entry for *_rxsync()
|
|
* Returns ring->head if ok, kring->nkr_num_slots on error.
|
|
*
|
|
* For a valid configuration,
|
|
* hwcur <= head <= cur <= tail <= hwtail
|
|
*
|
|
* We only consider head and cur.
|
|
* hwcur and hwtail are reliable.
|
|
*
|
|
*/
|
|
u_int
|
|
nm_rxsync_prologue(struct netmap_kring *kring, struct netmap_ring *ring)
|
|
{
|
|
uint32_t const n = kring->nkr_num_slots;
|
|
uint32_t head, cur;
|
|
|
|
nm_prdis(5,"%s kc %d kt %d h %d c %d t %d",
|
|
kring->name,
|
|
kring->nr_hwcur, kring->nr_hwtail,
|
|
ring->head, ring->cur, ring->tail);
|
|
/*
|
|
* Before storing the new values, we should check they do not
|
|
* move backwards. However:
|
|
* - head is not an issue because the previous value is hwcur;
|
|
* - cur could in principle go back, however it does not matter
|
|
* because we are processing a brand new rxsync()
|
|
*/
|
|
cur = kring->rcur = ring->cur; /* read only once */
|
|
head = kring->rhead = ring->head; /* read only once */
|
|
#if 1 /* kernel sanity checks */
|
|
NM_FAIL_ON(kring->nr_hwcur >= n || kring->nr_hwtail >= n);
|
|
#endif /* kernel sanity checks */
|
|
/* user sanity checks */
|
|
if (kring->nr_hwtail >= kring->nr_hwcur) {
|
|
/* want hwcur <= rhead <= hwtail */
|
|
NM_FAIL_ON(head < kring->nr_hwcur || head > kring->nr_hwtail);
|
|
/* and also rhead <= rcur <= hwtail */
|
|
NM_FAIL_ON(cur < head || cur > kring->nr_hwtail);
|
|
} else {
|
|
/* we need rhead outside hwtail..hwcur */
|
|
NM_FAIL_ON(head < kring->nr_hwcur && head > kring->nr_hwtail);
|
|
/* two cases now: head <= hwtail or head >= hwcur */
|
|
if (head <= kring->nr_hwtail) {
|
|
/* want head <= cur <= hwtail */
|
|
NM_FAIL_ON(cur < head || cur > kring->nr_hwtail);
|
|
} else {
|
|
/* cur must be outside hwtail..head */
|
|
NM_FAIL_ON(cur < head && cur > kring->nr_hwtail);
|
|
}
|
|
}
|
|
if (ring->tail != kring->rtail) {
|
|
nm_prlim(5, "%s tail overwritten was %d need %d",
|
|
kring->name,
|
|
ring->tail, kring->rtail);
|
|
ring->tail = kring->rtail;
|
|
}
|
|
return head;
|
|
}
|
|
|
|
|
|
/*
|
|
* Error routine called when txsync/rxsync detects an error.
|
|
* Can't do much more than resetting head = cur = hwcur, tail = hwtail
|
|
* Return 1 on reinit.
|
|
*
|
|
* This routine is only called by the upper half of the kernel.
|
|
* It only reads hwcur (which is changed only by the upper half, too)
|
|
* and hwtail (which may be changed by the lower half, but only on
|
|
* a tx ring and only to increase it, so any error will be recovered
|
|
* on the next call). For the above, we don't strictly need to call
|
|
* it under lock.
|
|
*/
|
|
int
|
|
netmap_ring_reinit(struct netmap_kring *kring)
|
|
{
|
|
struct netmap_ring *ring = kring->ring;
|
|
u_int i, lim = kring->nkr_num_slots - 1;
|
|
int errors = 0;
|
|
|
|
// XXX KASSERT nm_kr_tryget
|
|
nm_prlim(10, "called for %s", kring->name);
|
|
// XXX probably wrong to trust userspace
|
|
kring->rhead = ring->head;
|
|
kring->rcur = ring->cur;
|
|
kring->rtail = ring->tail;
|
|
|
|
if (ring->cur > lim)
|
|
errors++;
|
|
if (ring->head > lim)
|
|
errors++;
|
|
if (ring->tail > lim)
|
|
errors++;
|
|
for (i = 0; i <= lim; i++) {
|
|
u_int idx = ring->slot[i].buf_idx;
|
|
u_int len = ring->slot[i].len;
|
|
if (idx < 2 || idx >= kring->na->na_lut.objtotal) {
|
|
nm_prlim(5, "bad index at slot %d idx %d len %d ", i, idx, len);
|
|
ring->slot[i].buf_idx = 0;
|
|
ring->slot[i].len = 0;
|
|
} else if (len > NETMAP_BUF_SIZE(kring->na)) {
|
|
ring->slot[i].len = 0;
|
|
nm_prlim(5, "bad len at slot %d idx %d len %d", i, idx, len);
|
|
}
|
|
}
|
|
if (errors) {
|
|
nm_prlim(10, "total %d errors", errors);
|
|
nm_prlim(10, "%s reinit, cur %d -> %d tail %d -> %d",
|
|
kring->name,
|
|
ring->cur, kring->nr_hwcur,
|
|
ring->tail, kring->nr_hwtail);
|
|
ring->head = kring->rhead = kring->nr_hwcur;
|
|
ring->cur = kring->rcur = kring->nr_hwcur;
|
|
ring->tail = kring->rtail = kring->nr_hwtail;
|
|
}
|
|
return (errors ? 1 : 0);
|
|
}
|
|
|
|
/* interpret the ringid and flags fields of an nmreq, by translating them
|
|
* into a pair of intervals of ring indices:
|
|
*
|
|
* [priv->np_txqfirst, priv->np_txqlast) and
|
|
* [priv->np_rxqfirst, priv->np_rxqlast)
|
|
*
|
|
*/
|
|
int
|
|
netmap_interp_ringid(struct netmap_priv_d *priv, struct nmreq_header *hdr)
|
|
{
|
|
struct netmap_adapter *na = priv->np_na;
|
|
struct nmreq_register *reg = (struct nmreq_register *)hdr->nr_body;
|
|
int excluded_direction[] = { NR_TX_RINGS_ONLY, NR_RX_RINGS_ONLY };
|
|
enum txrx t;
|
|
u_int j;
|
|
u_int nr_flags = reg->nr_flags, nr_mode = reg->nr_mode,
|
|
nr_ringid = reg->nr_ringid;
|
|
|
|
for_rx_tx(t) {
|
|
if (nr_flags & excluded_direction[t]) {
|
|
priv->np_qfirst[t] = priv->np_qlast[t] = 0;
|
|
continue;
|
|
}
|
|
switch (nr_mode) {
|
|
case NR_REG_ALL_NIC:
|
|
case NR_REG_NULL:
|
|
priv->np_qfirst[t] = 0;
|
|
priv->np_qlast[t] = nma_get_nrings(na, t);
|
|
nm_prdis("ALL/PIPE: %s %d %d", nm_txrx2str(t),
|
|
priv->np_qfirst[t], priv->np_qlast[t]);
|
|
break;
|
|
case NR_REG_SW:
|
|
case NR_REG_NIC_SW:
|
|
if (!(na->na_flags & NAF_HOST_RINGS)) {
|
|
nm_prerr("host rings not supported");
|
|
return EINVAL;
|
|
}
|
|
priv->np_qfirst[t] = (nr_mode == NR_REG_SW ?
|
|
nma_get_nrings(na, t) : 0);
|
|
priv->np_qlast[t] = netmap_all_rings(na, t);
|
|
nm_prdis("%s: %s %d %d", nr_mode == NR_REG_SW ? "SW" : "NIC+SW",
|
|
nm_txrx2str(t),
|
|
priv->np_qfirst[t], priv->np_qlast[t]);
|
|
break;
|
|
case NR_REG_ONE_NIC:
|
|
if (nr_ringid >= na->num_tx_rings &&
|
|
nr_ringid >= na->num_rx_rings) {
|
|
nm_prerr("invalid ring id %d", nr_ringid);
|
|
return EINVAL;
|
|
}
|
|
/* if not enough rings, use the first one */
|
|
j = nr_ringid;
|
|
if (j >= nma_get_nrings(na, t))
|
|
j = 0;
|
|
priv->np_qfirst[t] = j;
|
|
priv->np_qlast[t] = j + 1;
|
|
nm_prdis("ONE_NIC: %s %d %d", nm_txrx2str(t),
|
|
priv->np_qfirst[t], priv->np_qlast[t]);
|
|
break;
|
|
case NR_REG_ONE_SW:
|
|
if (!(na->na_flags & NAF_HOST_RINGS)) {
|
|
nm_prerr("host rings not supported");
|
|
return EINVAL;
|
|
}
|
|
if (nr_ringid >= na->num_host_tx_rings &&
|
|
nr_ringid >= na->num_host_rx_rings) {
|
|
nm_prerr("invalid ring id %d", nr_ringid);
|
|
return EINVAL;
|
|
}
|
|
/* if not enough rings, use the first one */
|
|
j = nr_ringid;
|
|
if (j >= nma_get_host_nrings(na, t))
|
|
j = 0;
|
|
priv->np_qfirst[t] = nma_get_nrings(na, t) + j;
|
|
priv->np_qlast[t] = nma_get_nrings(na, t) + j + 1;
|
|
nm_prdis("ONE_SW: %s %d %d", nm_txrx2str(t),
|
|
priv->np_qfirst[t], priv->np_qlast[t]);
|
|
break;
|
|
default:
|
|
nm_prerr("invalid regif type %d", nr_mode);
|
|
return EINVAL;
|
|
}
|
|
}
|
|
priv->np_flags = nr_flags;
|
|
|
|
/* Allow transparent forwarding mode in the host --> nic
|
|
* direction only if all the TX hw rings have been opened. */
|
|
if (priv->np_qfirst[NR_TX] == 0 &&
|
|
priv->np_qlast[NR_TX] >= na->num_tx_rings) {
|
|
priv->np_sync_flags |= NAF_CAN_FORWARD_DOWN;
|
|
}
|
|
|
|
if (netmap_verbose) {
|
|
nm_prinf("%s: tx [%d,%d) rx [%d,%d) id %d",
|
|
na->name,
|
|
priv->np_qfirst[NR_TX],
|
|
priv->np_qlast[NR_TX],
|
|
priv->np_qfirst[NR_RX],
|
|
priv->np_qlast[NR_RX],
|
|
nr_ringid);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
|
|
/*
|
|
* Set the ring ID. For devices with a single queue, a request
|
|
* for all rings is the same as a single ring.
|
|
*/
|
|
static int
|
|
netmap_set_ringid(struct netmap_priv_d *priv, struct nmreq_header *hdr)
|
|
{
|
|
struct netmap_adapter *na = priv->np_na;
|
|
struct nmreq_register *reg = (struct nmreq_register *)hdr->nr_body;
|
|
int error;
|
|
enum txrx t;
|
|
|
|
error = netmap_interp_ringid(priv, hdr);
|
|
if (error) {
|
|
return error;
|
|
}
|
|
|
|
priv->np_txpoll = (reg->nr_flags & NR_NO_TX_POLL) ? 0 : 1;
|
|
|
|
/* optimization: count the users registered for more than
|
|
* one ring, which are the ones sleeping on the global queue.
|
|
* The default netmap_notify() callback will then
|
|
* avoid signaling the global queue if nobody is using it
|
|
*/
|
|
for_rx_tx(t) {
|
|
if (nm_si_user(priv, t))
|
|
na->si_users[t]++;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void
|
|
netmap_unset_ringid(struct netmap_priv_d *priv)
|
|
{
|
|
struct netmap_adapter *na = priv->np_na;
|
|
enum txrx t;
|
|
|
|
for_rx_tx(t) {
|
|
if (nm_si_user(priv, t))
|
|
na->si_users[t]--;
|
|
priv->np_qfirst[t] = priv->np_qlast[t] = 0;
|
|
}
|
|
priv->np_flags = 0;
|
|
priv->np_txpoll = 0;
|
|
priv->np_kloop_state = 0;
|
|
}
|
|
|
|
#define within_sel(p_, t_, i_) \
|
|
((i_) < (p_)->np_qlast[(t_)])
|
|
#define nonempty_sel(p_, t_) \
|
|
(within_sel((p_), (t_), (p_)->np_qfirst[(t_)]))
|
|
#define foreach_selected_ring(p_, t_, i_, kring_) \
|
|
for ((t_) = nonempty_sel((p_), NR_RX) ? NR_RX : NR_TX, \
|
|
(i_) = (p_)->np_qfirst[(t_)]; \
|
|
(t_ == NR_RX || \
|
|
(t == NR_TX && within_sel((p_), (t_), (i_)))) && \
|
|
((kring_) = NMR((p_)->np_na, (t_))[(i_)]); \
|
|
(i_) = within_sel((p_), (t_), (i_) + 1) ? (i_) + 1 : \
|
|
(++(t_) < NR_TXRX ? (p_)->np_qfirst[(t_)] : (i_)))
|
|
|
|
|
|
/* Set the nr_pending_mode for the requested rings.
|
|
* If requested, also try to get exclusive access to the rings, provided
|
|
* the rings we want to bind are not exclusively owned by a previous bind.
|
|
*/
|
|
static int
|
|
netmap_krings_get(struct netmap_priv_d *priv)
|
|
{
|
|
struct netmap_adapter *na = priv->np_na;
|
|
u_int i;
|
|
struct netmap_kring *kring;
|
|
int excl = (priv->np_flags & NR_EXCLUSIVE);
|
|
enum txrx t;
|
|
|
|
if (netmap_debug & NM_DEBUG_ON)
|
|
nm_prinf("%s: grabbing tx [%d, %d) rx [%d, %d)",
|
|
na->name,
|
|
priv->np_qfirst[NR_TX],
|
|
priv->np_qlast[NR_TX],
|
|
priv->np_qfirst[NR_RX],
|
|
priv->np_qlast[NR_RX]);
|
|
|
|
/* first round: check that all the requested rings
|
|
* are neither alread exclusively owned, nor we
|
|
* want exclusive ownership when they are already in use
|
|
*/
|
|
foreach_selected_ring(priv, t, i, kring) {
|
|
if ((kring->nr_kflags & NKR_EXCLUSIVE) ||
|
|
(kring->users && excl))
|
|
{
|
|
nm_prdis("ring %s busy", kring->name);
|
|
return EBUSY;
|
|
}
|
|
}
|
|
|
|
/* second round: increment usage count (possibly marking them
|
|
* as exclusive) and set the nr_pending_mode
|
|
*/
|
|
foreach_selected_ring(priv, t, i, kring) {
|
|
kring->users++;
|
|
if (excl)
|
|
kring->nr_kflags |= NKR_EXCLUSIVE;
|
|
kring->nr_pending_mode = NKR_NETMAP_ON;
|
|
}
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
/* Undo netmap_krings_get(). This is done by clearing the exclusive mode
|
|
* if was asked on regif, and unset the nr_pending_mode if we are the
|
|
* last users of the involved rings. */
|
|
static void
|
|
netmap_krings_put(struct netmap_priv_d *priv)
|
|
{
|
|
u_int i;
|
|
struct netmap_kring *kring;
|
|
int excl = (priv->np_flags & NR_EXCLUSIVE);
|
|
enum txrx t;
|
|
|
|
nm_prdis("%s: releasing tx [%d, %d) rx [%d, %d)",
|
|
na->name,
|
|
priv->np_qfirst[NR_TX],
|
|
priv->np_qlast[NR_TX],
|
|
priv->np_qfirst[NR_RX],
|
|
priv->np_qlast[MR_RX]);
|
|
|
|
foreach_selected_ring(priv, t, i, kring) {
|
|
if (excl)
|
|
kring->nr_kflags &= ~NKR_EXCLUSIVE;
|
|
kring->users--;
|
|
if (kring->users == 0)
|
|
kring->nr_pending_mode = NKR_NETMAP_OFF;
|
|
}
|
|
}
|
|
|
|
static int
|
|
nm_priv_rx_enabled(struct netmap_priv_d *priv)
|
|
{
|
|
return (priv->np_qfirst[NR_RX] != priv->np_qlast[NR_RX]);
|
|
}
|
|
|
|
/* Validate the CSB entries for both directions (atok and ktoa).
|
|
* To be called under NMG_LOCK(). */
|
|
static int
|
|
netmap_csb_validate(struct netmap_priv_d *priv, struct nmreq_opt_csb *csbo)
|
|
{
|
|
struct nm_csb_atok *csb_atok_base =
|
|
(struct nm_csb_atok *)(uintptr_t)csbo->csb_atok;
|
|
struct nm_csb_ktoa *csb_ktoa_base =
|
|
(struct nm_csb_ktoa *)(uintptr_t)csbo->csb_ktoa;
|
|
enum txrx t;
|
|
int num_rings[NR_TXRX], tot_rings;
|
|
size_t entry_size[2];
|
|
void *csb_start[2];
|
|
int i;
|
|
|
|
if (priv->np_kloop_state & NM_SYNC_KLOOP_RUNNING) {
|
|
nm_prerr("Cannot update CSB while kloop is running");
|
|
return EBUSY;
|
|
}
|
|
|
|
tot_rings = 0;
|
|
for_rx_tx(t) {
|
|
num_rings[t] = priv->np_qlast[t] - priv->np_qfirst[t];
|
|
tot_rings += num_rings[t];
|
|
}
|
|
if (tot_rings <= 0)
|
|
return 0;
|
|
|
|
if (!(priv->np_flags & NR_EXCLUSIVE)) {
|
|
nm_prerr("CSB mode requires NR_EXCLUSIVE");
|
|
return EINVAL;
|
|
}
|
|
|
|
entry_size[0] = sizeof(*csb_atok_base);
|
|
entry_size[1] = sizeof(*csb_ktoa_base);
|
|
csb_start[0] = (void *)csb_atok_base;
|
|
csb_start[1] = (void *)csb_ktoa_base;
|
|
|
|
for (i = 0; i < 2; i++) {
|
|
/* On Linux we could use access_ok() to simplify
|
|
* the validation. However, the advantage of
|
|
* this approach is that it works also on
|
|
* FreeBSD. */
|
|
size_t csb_size = tot_rings * entry_size[i];
|
|
void *tmp;
|
|
int err;
|
|
|
|
if ((uintptr_t)csb_start[i] & (entry_size[i]-1)) {
|
|
nm_prerr("Unaligned CSB address");
|
|
return EINVAL;
|
|
}
|
|
|
|
tmp = nm_os_malloc(csb_size);
|
|
if (!tmp)
|
|
return ENOMEM;
|
|
if (i == 0) {
|
|
/* Application --> kernel direction. */
|
|
err = copyin(csb_start[i], tmp, csb_size);
|
|
} else {
|
|
/* Kernel --> application direction. */
|
|
memset(tmp, 0, csb_size);
|
|
err = copyout(tmp, csb_start[i], csb_size);
|
|
}
|
|
nm_os_free(tmp);
|
|
if (err) {
|
|
nm_prerr("Invalid CSB address");
|
|
return err;
|
|
}
|
|
}
|
|
|
|
priv->np_csb_atok_base = csb_atok_base;
|
|
priv->np_csb_ktoa_base = csb_ktoa_base;
|
|
|
|
/* Initialize the CSB. */
|
|
for_rx_tx(t) {
|
|
for (i = 0; i < num_rings[t]; i++) {
|
|
struct netmap_kring *kring =
|
|
NMR(priv->np_na, t)[i + priv->np_qfirst[t]];
|
|
struct nm_csb_atok *csb_atok = csb_atok_base + i;
|
|
struct nm_csb_ktoa *csb_ktoa = csb_ktoa_base + i;
|
|
|
|
if (t == NR_RX) {
|
|
csb_atok += num_rings[NR_TX];
|
|
csb_ktoa += num_rings[NR_TX];
|
|
}
|
|
|
|
CSB_WRITE(csb_atok, head, kring->rhead);
|
|
CSB_WRITE(csb_atok, cur, kring->rcur);
|
|
CSB_WRITE(csb_atok, appl_need_kick, 1);
|
|
CSB_WRITE(csb_atok, sync_flags, 1);
|
|
CSB_WRITE(csb_ktoa, hwcur, kring->nr_hwcur);
|
|
CSB_WRITE(csb_ktoa, hwtail, kring->nr_hwtail);
|
|
CSB_WRITE(csb_ktoa, kern_need_kick, 1);
|
|
|
|
nm_prinf("csb_init for kring %s: head %u, cur %u, "
|
|
"hwcur %u, hwtail %u", kring->name,
|
|
kring->rhead, kring->rcur, kring->nr_hwcur,
|
|
kring->nr_hwtail);
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Ensure that the netmap adapter can support the given MTU.
|
|
* @return EINVAL if the na cannot be set to mtu, 0 otherwise.
|
|
*/
|
|
int
|
|
netmap_buf_size_validate(const struct netmap_adapter *na, unsigned mtu) {
|
|
unsigned nbs = NETMAP_BUF_SIZE(na);
|
|
|
|
if (mtu <= na->rx_buf_maxsize) {
|
|
/* The MTU fits a single NIC slot. We only
|
|
* Need to check that netmap buffers are
|
|
* large enough to hold an MTU. NS_MOREFRAG
|
|
* cannot be used in this case. */
|
|
if (nbs < mtu) {
|
|
nm_prerr("error: netmap buf size (%u) "
|
|
"< device MTU (%u)", nbs, mtu);
|
|
return EINVAL;
|
|
}
|
|
} else {
|
|
/* More NIC slots may be needed to receive
|
|
* or transmit a single packet. Check that
|
|
* the adapter supports NS_MOREFRAG and that
|
|
* netmap buffers are large enough to hold
|
|
* the maximum per-slot size. */
|
|
if (!(na->na_flags & NAF_MOREFRAG)) {
|
|
nm_prerr("error: large MTU (%d) needed "
|
|
"but %s does not support "
|
|
"NS_MOREFRAG", mtu,
|
|
na->ifp->if_xname);
|
|
return EINVAL;
|
|
} else if (nbs < na->rx_buf_maxsize) {
|
|
nm_prerr("error: using NS_MOREFRAG on "
|
|
"%s requires netmap buf size "
|
|
">= %u", na->ifp->if_xname,
|
|
na->rx_buf_maxsize);
|
|
return EINVAL;
|
|
} else {
|
|
nm_prinf("info: netmap application on "
|
|
"%s needs to support "
|
|
"NS_MOREFRAG "
|
|
"(MTU=%u,netmap_buf_size=%u)",
|
|
na->ifp->if_xname, mtu, nbs);
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
|
|
/*
|
|
* possibly move the interface to netmap-mode.
|
|
* If success it returns a pointer to netmap_if, otherwise NULL.
|
|
* This must be called with NMG_LOCK held.
|
|
*
|
|
* The following na callbacks are called in the process:
|
|
*
|
|
* na->nm_config() [by netmap_update_config]
|
|
* (get current number and size of rings)
|
|
*
|
|
* We have a generic one for linux (netmap_linux_config).
|
|
* The bwrap has to override this, since it has to forward
|
|
* the request to the wrapped adapter (netmap_bwrap_config).
|
|
*
|
|
*
|
|
* na->nm_krings_create()
|
|
* (create and init the krings array)
|
|
*
|
|
* One of the following:
|
|
*
|
|
* * netmap_hw_krings_create, (hw ports)
|
|
* creates the standard layout for the krings
|
|
* and adds the mbq (used for the host rings).
|
|
*
|
|
* * netmap_vp_krings_create (VALE ports)
|
|
* add leases and scratchpads
|
|
*
|
|
* * netmap_pipe_krings_create (pipes)
|
|
* create the krings and rings of both ends and
|
|
* cross-link them
|
|
*
|
|
* * netmap_monitor_krings_create (monitors)
|
|
* avoid allocating the mbq
|
|
*
|
|
* * netmap_bwrap_krings_create (bwraps)
|
|
* create both the brap krings array,
|
|
* the krings array of the wrapped adapter, and
|
|
* (if needed) the fake array for the host adapter
|
|
*
|
|
* na->nm_register(, 1)
|
|
* (put the adapter in netmap mode)
|
|
*
|
|
* This may be one of the following:
|
|
*
|
|
* * netmap_hw_reg (hw ports)
|
|
* checks that the ifp is still there, then calls
|
|
* the hardware specific callback;
|
|
*
|
|
* * netmap_vp_reg (VALE ports)
|
|
* If the port is connected to a bridge,
|
|
* set the NAF_NETMAP_ON flag under the
|
|
* bridge write lock.
|
|
*
|
|
* * netmap_pipe_reg (pipes)
|
|
* inform the other pipe end that it is no
|
|
* longer responsible for the lifetime of this
|
|
* pipe end
|
|
*
|
|
* * netmap_monitor_reg (monitors)
|
|
* intercept the sync callbacks of the monitored
|
|
* rings
|
|
*
|
|
* * netmap_bwrap_reg (bwraps)
|
|
* cross-link the bwrap and hwna rings,
|
|
* forward the request to the hwna, override
|
|
* the hwna notify callback (to get the frames
|
|
* coming from outside go through the bridge).
|
|
*
|
|
*
|
|
*/
|
|
int
|
|
netmap_do_regif(struct netmap_priv_d *priv, struct netmap_adapter *na,
|
|
struct nmreq_header *hdr)
|
|
{
|
|
struct netmap_if *nifp = NULL;
|
|
int error;
|
|
|
|
NMG_LOCK_ASSERT();
|
|
priv->np_na = na; /* store the reference */
|
|
error = netmap_mem_finalize(na->nm_mem, na);
|
|
if (error)
|
|
goto err;
|
|
|
|
if (na->active_fds == 0) {
|
|
|
|
/* cache the allocator info in the na */
|
|
error = netmap_mem_get_lut(na->nm_mem, &na->na_lut);
|
|
if (error)
|
|
goto err_drop_mem;
|
|
nm_prdis("lut %p bufs %u size %u", na->na_lut.lut, na->na_lut.objtotal,
|
|
na->na_lut.objsize);
|
|
|
|
/* ring configuration may have changed, fetch from the card */
|
|
netmap_update_config(na);
|
|
}
|
|
|
|
/* compute the range of tx and rx rings to monitor */
|
|
error = netmap_set_ringid(priv, hdr);
|
|
if (error)
|
|
goto err_put_lut;
|
|
|
|
if (na->active_fds == 0) {
|
|
/*
|
|
* If this is the first registration of the adapter,
|
|
* perform sanity checks and create the in-kernel view
|
|
* of the netmap rings (the netmap krings).
|
|
*/
|
|
if (na->ifp && nm_priv_rx_enabled(priv)) {
|
|
/* This netmap adapter is attached to an ifnet. */
|
|
unsigned mtu = nm_os_ifnet_mtu(na->ifp);
|
|
|
|
nm_prdis("%s: mtu %d rx_buf_maxsize %d netmap_buf_size %d",
|
|
na->name, mtu, na->rx_buf_maxsize, NETMAP_BUF_SIZE(na));
|
|
|
|
if (na->rx_buf_maxsize == 0) {
|
|
nm_prerr("%s: error: rx_buf_maxsize == 0", na->name);
|
|
error = EIO;
|
|
goto err_drop_mem;
|
|
}
|
|
|
|
error = netmap_buf_size_validate(na, mtu);
|
|
if (error)
|
|
goto err_drop_mem;
|
|
}
|
|
|
|
/*
|
|
* Depending on the adapter, this may also create
|
|
* the netmap rings themselves
|
|
*/
|
|
error = na->nm_krings_create(na);
|
|
if (error)
|
|
goto err_put_lut;
|
|
|
|
}
|
|
|
|
/* now the krings must exist and we can check whether some
|
|
* previous bind has exclusive ownership on them, and set
|
|
* nr_pending_mode
|
|
*/
|
|
error = netmap_krings_get(priv);
|
|
if (error)
|
|
goto err_del_krings;
|
|
|
|
/* create all needed missing netmap rings */
|
|
error = netmap_mem_rings_create(na);
|
|
if (error)
|
|
goto err_rel_excl;
|
|
|
|
/* in all cases, create a new netmap if */
|
|
nifp = netmap_mem_if_new(na, priv);
|
|
if (nifp == NULL) {
|
|
error = ENOMEM;
|
|
goto err_rel_excl;
|
|
}
|
|
|
|
if (nm_kring_pending(priv)) {
|
|
/* Some kring is switching mode, tell the adapter to
|
|
* react on this. */
|
|
error = na->nm_register(na, 1);
|
|
if (error)
|
|
goto err_del_if;
|
|
}
|
|
|
|
/* Commit the reference. */
|
|
na->active_fds++;
|
|
|
|
/*
|
|
* advertise that the interface is ready by setting np_nifp.
|
|
* The barrier is needed because readers (poll, *SYNC and mmap)
|
|
* check for priv->np_nifp != NULL without locking
|
|
*/
|
|
mb(); /* make sure previous writes are visible to all CPUs */
|
|
priv->np_nifp = nifp;
|
|
|
|
return 0;
|
|
|
|
err_del_if:
|
|
netmap_mem_if_delete(na, nifp);
|
|
err_rel_excl:
|
|
netmap_krings_put(priv);
|
|
netmap_mem_rings_delete(na);
|
|
err_del_krings:
|
|
if (na->active_fds == 0)
|
|
na->nm_krings_delete(na);
|
|
err_put_lut:
|
|
if (na->active_fds == 0)
|
|
memset(&na->na_lut, 0, sizeof(na->na_lut));
|
|
err_drop_mem:
|
|
netmap_mem_drop(na);
|
|
err:
|
|
priv->np_na = NULL;
|
|
return error;
|
|
}
|
|
|
|
|
|
/*
|
|
* update kring and ring at the end of rxsync/txsync.
|
|
*/
|
|
static inline void
|
|
nm_sync_finalize(struct netmap_kring *kring)
|
|
{
|
|
/*
|
|
* Update ring tail to what the kernel knows
|
|
* After txsync: head/rhead/hwcur might be behind cur/rcur
|
|
* if no carrier.
|
|
*/
|
|
kring->ring->tail = kring->rtail = kring->nr_hwtail;
|
|
|
|
nm_prdis(5, "%s now hwcur %d hwtail %d head %d cur %d tail %d",
|
|
kring->name, kring->nr_hwcur, kring->nr_hwtail,
|
|
kring->rhead, kring->rcur, kring->rtail);
|
|
}
|
|
|
|
/* set ring timestamp */
|
|
static inline void
|
|
ring_timestamp_set(struct netmap_ring *ring)
|
|
{
|
|
if (netmap_no_timestamp == 0 || ring->flags & NR_TIMESTAMP) {
|
|
microtime(&ring->ts);
|
|
}
|
|
}
|
|
|
|
static int nmreq_copyin(struct nmreq_header *, int);
|
|
static int nmreq_copyout(struct nmreq_header *, int);
|
|
static int nmreq_checkoptions(struct nmreq_header *);
|
|
|
|
/*
|
|
* ioctl(2) support for the "netmap" device.
|
|
*
|
|
* Following a list of accepted commands:
|
|
* - NIOCCTRL device control API
|
|
* - NIOCTXSYNC sync TX rings
|
|
* - NIOCRXSYNC sync RX rings
|
|
* - SIOCGIFADDR just for convenience
|
|
* - NIOCGINFO deprecated (legacy API)
|
|
* - NIOCREGIF deprecated (legacy API)
|
|
*
|
|
* Return 0 on success, errno otherwise.
|
|
*/
|
|
int
|
|
netmap_ioctl(struct netmap_priv_d *priv, u_long cmd, caddr_t data,
|
|
struct thread *td, int nr_body_is_user)
|
|
{
|
|
struct mbq q; /* packets from RX hw queues to host stack */
|
|
struct netmap_adapter *na = NULL;
|
|
struct netmap_mem_d *nmd = NULL;
|
|
struct ifnet *ifp = NULL;
|
|
int error = 0;
|
|
u_int i, qfirst, qlast;
|
|
struct netmap_kring **krings;
|
|
int sync_flags;
|
|
enum txrx t;
|
|
|
|
switch (cmd) {
|
|
case NIOCCTRL: {
|
|
struct nmreq_header *hdr = (struct nmreq_header *)data;
|
|
|
|
if (hdr->nr_version < NETMAP_MIN_API ||
|
|
hdr->nr_version > NETMAP_MAX_API) {
|
|
nm_prerr("API mismatch: got %d need %d",
|
|
hdr->nr_version, NETMAP_API);
|
|
return EINVAL;
|
|
}
|
|
|
|
/* Make a kernel-space copy of the user-space nr_body.
|
|
* For convenince, the nr_body pointer and the pointers
|
|
* in the options list will be replaced with their
|
|
* kernel-space counterparts. The original pointers are
|
|
* saved internally and later restored by nmreq_copyout
|
|
*/
|
|
error = nmreq_copyin(hdr, nr_body_is_user);
|
|
if (error) {
|
|
return error;
|
|
}
|
|
|
|
/* Sanitize hdr->nr_name. */
|
|
hdr->nr_name[sizeof(hdr->nr_name) - 1] = '\0';
|
|
|
|
switch (hdr->nr_reqtype) {
|
|
case NETMAP_REQ_REGISTER: {
|
|
struct nmreq_register *req =
|
|
(struct nmreq_register *)(uintptr_t)hdr->nr_body;
|
|
struct netmap_if *nifp;
|
|
|
|
/* Protect access to priv from concurrent requests. */
|
|
NMG_LOCK();
|
|
do {
|
|
struct nmreq_option *opt;
|
|
u_int memflags;
|
|
|
|
if (priv->np_nifp != NULL) { /* thread already registered */
|
|
error = EBUSY;
|
|
break;
|
|
}
|
|
|
|
#ifdef WITH_EXTMEM
|
|
opt = nmreq_getoption(hdr, NETMAP_REQ_OPT_EXTMEM);
|
|
if (opt != NULL) {
|
|
struct nmreq_opt_extmem *e =
|
|
(struct nmreq_opt_extmem *)opt;
|
|
|
|
nmd = netmap_mem_ext_create(e->nro_usrptr,
|
|
&e->nro_info, &error);
|
|
opt->nro_status = error;
|
|
if (nmd == NULL)
|
|
break;
|
|
}
|
|
#endif /* WITH_EXTMEM */
|
|
|
|
if (nmd == NULL && req->nr_mem_id) {
|
|
/* find the allocator and get a reference */
|
|
nmd = netmap_mem_find(req->nr_mem_id);
|
|
if (nmd == NULL) {
|
|
if (netmap_verbose) {
|
|
nm_prerr("%s: failed to find mem_id %u",
|
|
hdr->nr_name, req->nr_mem_id);
|
|
}
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
}
|
|
/* find the interface and a reference */
|
|
error = netmap_get_na(hdr, &na, &ifp, nmd,
|
|
1 /* create */); /* keep reference */
|
|
if (error)
|
|
break;
|
|
if (NETMAP_OWNED_BY_KERN(na)) {
|
|
error = EBUSY;
|
|
break;
|
|
}
|
|
|
|
if (na->virt_hdr_len && !(req->nr_flags & NR_ACCEPT_VNET_HDR)) {
|
|
nm_prerr("virt_hdr_len=%d, but application does "
|
|
"not accept it", na->virt_hdr_len);
|
|
error = EIO;
|
|
break;
|
|
}
|
|
|
|
error = netmap_do_regif(priv, na, hdr);
|
|
if (error) { /* reg. failed, release priv and ref */
|
|
break;
|
|
}
|
|
|
|
opt = nmreq_getoption(hdr, NETMAP_REQ_OPT_CSB);
|
|
if (opt != NULL) {
|
|
struct nmreq_opt_csb *csbo =
|
|
(struct nmreq_opt_csb *)opt;
|
|
error = netmap_csb_validate(priv, csbo);
|
|
opt->nro_status = error;
|
|
if (error) {
|
|
netmap_do_unregif(priv);
|
|
break;
|
|
}
|
|
}
|
|
|
|
nifp = priv->np_nifp;
|
|
|
|
/* return the offset of the netmap_if object */
|
|
req->nr_rx_rings = na->num_rx_rings;
|
|
req->nr_tx_rings = na->num_tx_rings;
|
|
req->nr_rx_slots = na->num_rx_desc;
|
|
req->nr_tx_slots = na->num_tx_desc;
|
|
req->nr_host_tx_rings = na->num_host_tx_rings;
|
|
req->nr_host_rx_rings = na->num_host_rx_rings;
|
|
error = netmap_mem_get_info(na->nm_mem, &req->nr_memsize, &memflags,
|
|
&req->nr_mem_id);
|
|
if (error) {
|
|
netmap_do_unregif(priv);
|
|
break;
|
|
}
|
|
if (memflags & NETMAP_MEM_PRIVATE) {
|
|
*(uint32_t *)(uintptr_t)&nifp->ni_flags |= NI_PRIV_MEM;
|
|
}
|
|
for_rx_tx(t) {
|
|
priv->np_si[t] = nm_si_user(priv, t) ?
|
|
&na->si[t] : &NMR(na, t)[priv->np_qfirst[t]]->si;
|
|
}
|
|
|
|
if (req->nr_extra_bufs) {
|
|
if (netmap_verbose)
|
|
nm_prinf("requested %d extra buffers",
|
|
req->nr_extra_bufs);
|
|
req->nr_extra_bufs = netmap_extra_alloc(na,
|
|
&nifp->ni_bufs_head, req->nr_extra_bufs);
|
|
if (netmap_verbose)
|
|
nm_prinf("got %d extra buffers", req->nr_extra_bufs);
|
|
}
|
|
req->nr_offset = netmap_mem_if_offset(na->nm_mem, nifp);
|
|
|
|
error = nmreq_checkoptions(hdr);
|
|
if (error) {
|
|
netmap_do_unregif(priv);
|
|
break;
|
|
}
|
|
|
|
/* store ifp reference so that priv destructor may release it */
|
|
priv->np_ifp = ifp;
|
|
} while (0);
|
|
if (error) {
|
|
netmap_unget_na(na, ifp);
|
|
}
|
|
/* release the reference from netmap_mem_find() or
|
|
* netmap_mem_ext_create()
|
|
*/
|
|
if (nmd)
|
|
netmap_mem_put(nmd);
|
|
NMG_UNLOCK();
|
|
break;
|
|
}
|
|
|
|
case NETMAP_REQ_PORT_INFO_GET: {
|
|
struct nmreq_port_info_get *req =
|
|
(struct nmreq_port_info_get *)(uintptr_t)hdr->nr_body;
|
|
|
|
NMG_LOCK();
|
|
do {
|
|
u_int memflags;
|
|
|
|
if (hdr->nr_name[0] != '\0') {
|
|
/* Build a nmreq_register out of the nmreq_port_info_get,
|
|
* so that we can call netmap_get_na(). */
|
|
struct nmreq_register regreq;
|
|
bzero(®req, sizeof(regreq));
|
|
regreq.nr_mode = NR_REG_ALL_NIC;
|
|
regreq.nr_tx_slots = req->nr_tx_slots;
|
|
regreq.nr_rx_slots = req->nr_rx_slots;
|
|
regreq.nr_tx_rings = req->nr_tx_rings;
|
|
regreq.nr_rx_rings = req->nr_rx_rings;
|
|
regreq.nr_host_tx_rings = req->nr_host_tx_rings;
|
|
regreq.nr_host_rx_rings = req->nr_host_rx_rings;
|
|
regreq.nr_mem_id = req->nr_mem_id;
|
|
|
|
/* get a refcount */
|
|
hdr->nr_reqtype = NETMAP_REQ_REGISTER;
|
|
hdr->nr_body = (uintptr_t)®req;
|
|
error = netmap_get_na(hdr, &na, &ifp, NULL, 1 /* create */);
|
|
hdr->nr_reqtype = NETMAP_REQ_PORT_INFO_GET; /* reset type */
|
|
hdr->nr_body = (uintptr_t)req; /* reset nr_body */
|
|
if (error) {
|
|
na = NULL;
|
|
ifp = NULL;
|
|
break;
|
|
}
|
|
nmd = na->nm_mem; /* get memory allocator */
|
|
} else {
|
|
nmd = netmap_mem_find(req->nr_mem_id ? req->nr_mem_id : 1);
|
|
if (nmd == NULL) {
|
|
if (netmap_verbose)
|
|
nm_prerr("%s: failed to find mem_id %u",
|
|
hdr->nr_name,
|
|
req->nr_mem_id ? req->nr_mem_id : 1);
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
}
|
|
|
|
error = netmap_mem_get_info(nmd, &req->nr_memsize, &memflags,
|
|
&req->nr_mem_id);
|
|
if (error)
|
|
break;
|
|
if (na == NULL) /* only memory info */
|
|
break;
|
|
netmap_update_config(na);
|
|
req->nr_rx_rings = na->num_rx_rings;
|
|
req->nr_tx_rings = na->num_tx_rings;
|
|
req->nr_rx_slots = na->num_rx_desc;
|
|
req->nr_tx_slots = na->num_tx_desc;
|
|
req->nr_host_tx_rings = na->num_host_tx_rings;
|
|
req->nr_host_rx_rings = na->num_host_rx_rings;
|
|
} while (0);
|
|
netmap_unget_na(na, ifp);
|
|
NMG_UNLOCK();
|
|
break;
|
|
}
|
|
#ifdef WITH_VALE
|
|
case NETMAP_REQ_VALE_ATTACH: {
|
|
error = netmap_vale_attach(hdr, NULL /* userspace request */);
|
|
break;
|
|
}
|
|
|
|
case NETMAP_REQ_VALE_DETACH: {
|
|
error = netmap_vale_detach(hdr, NULL /* userspace request */);
|
|
break;
|
|
}
|
|
|
|
case NETMAP_REQ_VALE_LIST: {
|
|
error = netmap_vale_list(hdr);
|
|
break;
|
|
}
|
|
|
|
case NETMAP_REQ_PORT_HDR_SET: {
|
|
struct nmreq_port_hdr *req =
|
|
(struct nmreq_port_hdr *)(uintptr_t)hdr->nr_body;
|
|
/* Build a nmreq_register out of the nmreq_port_hdr,
|
|
* so that we can call netmap_get_bdg_na(). */
|
|
struct nmreq_register regreq;
|
|
bzero(®req, sizeof(regreq));
|
|
regreq.nr_mode = NR_REG_ALL_NIC;
|
|
|
|
/* For now we only support virtio-net headers, and only for
|
|
* VALE ports, but this may change in future. Valid lengths
|
|
* for the virtio-net header are 0 (no header), 10 and 12. */
|
|
if (req->nr_hdr_len != 0 &&
|
|
req->nr_hdr_len != sizeof(struct nm_vnet_hdr) &&
|
|
req->nr_hdr_len != 12) {
|
|
if (netmap_verbose)
|
|
nm_prerr("invalid hdr_len %u", req->nr_hdr_len);
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
NMG_LOCK();
|
|
hdr->nr_reqtype = NETMAP_REQ_REGISTER;
|
|
hdr->nr_body = (uintptr_t)®req;
|
|
error = netmap_get_vale_na(hdr, &na, NULL, 0);
|
|
hdr->nr_reqtype = NETMAP_REQ_PORT_HDR_SET;
|
|
hdr->nr_body = (uintptr_t)req;
|
|
if (na && !error) {
|
|
struct netmap_vp_adapter *vpna =
|
|
(struct netmap_vp_adapter *)na;
|
|
na->virt_hdr_len = req->nr_hdr_len;
|
|
if (na->virt_hdr_len) {
|
|
vpna->mfs = NETMAP_BUF_SIZE(na);
|
|
}
|
|
if (netmap_verbose)
|
|
nm_prinf("Using vnet_hdr_len %d for %p", na->virt_hdr_len, na);
|
|
netmap_adapter_put(na);
|
|
} else if (!na) {
|
|
error = ENXIO;
|
|
}
|
|
NMG_UNLOCK();
|
|
break;
|
|
}
|
|
|
|
case NETMAP_REQ_PORT_HDR_GET: {
|
|
/* Get vnet-header length for this netmap port */
|
|
struct nmreq_port_hdr *req =
|
|
(struct nmreq_port_hdr *)(uintptr_t)hdr->nr_body;
|
|
/* Build a nmreq_register out of the nmreq_port_hdr,
|
|
* so that we can call netmap_get_bdg_na(). */
|
|
struct nmreq_register regreq;
|
|
struct ifnet *ifp;
|
|
|
|
bzero(®req, sizeof(regreq));
|
|
regreq.nr_mode = NR_REG_ALL_NIC;
|
|
NMG_LOCK();
|
|
hdr->nr_reqtype = NETMAP_REQ_REGISTER;
|
|
hdr->nr_body = (uintptr_t)®req;
|
|
error = netmap_get_na(hdr, &na, &ifp, NULL, 0);
|
|
hdr->nr_reqtype = NETMAP_REQ_PORT_HDR_GET;
|
|
hdr->nr_body = (uintptr_t)req;
|
|
if (na && !error) {
|
|
req->nr_hdr_len = na->virt_hdr_len;
|
|
}
|
|
netmap_unget_na(na, ifp);
|
|
NMG_UNLOCK();
|
|
break;
|
|
}
|
|
|
|
case NETMAP_REQ_VALE_NEWIF: {
|
|
error = nm_vi_create(hdr);
|
|
break;
|
|
}
|
|
|
|
case NETMAP_REQ_VALE_DELIF: {
|
|
error = nm_vi_destroy(hdr->nr_name);
|
|
break;
|
|
}
|
|
|
|
case NETMAP_REQ_VALE_POLLING_ENABLE:
|
|
case NETMAP_REQ_VALE_POLLING_DISABLE: {
|
|
error = nm_bdg_polling(hdr);
|
|
break;
|
|
}
|
|
#endif /* WITH_VALE */
|
|
case NETMAP_REQ_POOLS_INFO_GET: {
|
|
/* Get information from the memory allocator used for
|
|
* hdr->nr_name. */
|
|
struct nmreq_pools_info *req =
|
|
(struct nmreq_pools_info *)(uintptr_t)hdr->nr_body;
|
|
NMG_LOCK();
|
|
do {
|
|
/* Build a nmreq_register out of the nmreq_pools_info,
|
|
* so that we can call netmap_get_na(). */
|
|
struct nmreq_register regreq;
|
|
bzero(®req, sizeof(regreq));
|
|
regreq.nr_mem_id = req->nr_mem_id;
|
|
regreq.nr_mode = NR_REG_ALL_NIC;
|
|
|
|
hdr->nr_reqtype = NETMAP_REQ_REGISTER;
|
|
hdr->nr_body = (uintptr_t)®req;
|
|
error = netmap_get_na(hdr, &na, &ifp, NULL, 1 /* create */);
|
|
hdr->nr_reqtype = NETMAP_REQ_POOLS_INFO_GET; /* reset type */
|
|
hdr->nr_body = (uintptr_t)req; /* reset nr_body */
|
|
if (error) {
|
|
na = NULL;
|
|
ifp = NULL;
|
|
break;
|
|
}
|
|
nmd = na->nm_mem; /* grab the memory allocator */
|
|
if (nmd == NULL) {
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
|
|
/* Finalize the memory allocator, get the pools
|
|
* information and release the allocator. */
|
|
error = netmap_mem_finalize(nmd, na);
|
|
if (error) {
|
|
break;
|
|
}
|
|
error = netmap_mem_pools_info_get(req, nmd);
|
|
netmap_mem_drop(na);
|
|
} while (0);
|
|
netmap_unget_na(na, ifp);
|
|
NMG_UNLOCK();
|
|
break;
|
|
}
|
|
|
|
case NETMAP_REQ_CSB_ENABLE: {
|
|
struct nmreq_option *opt;
|
|
|
|
opt = nmreq_getoption(hdr, NETMAP_REQ_OPT_CSB);
|
|
if (opt == NULL) {
|
|
error = EINVAL;
|
|
} else {
|
|
struct nmreq_opt_csb *csbo =
|
|
(struct nmreq_opt_csb *)opt;
|
|
NMG_LOCK();
|
|
error = netmap_csb_validate(priv, csbo);
|
|
NMG_UNLOCK();
|
|
opt->nro_status = error;
|
|
}
|
|
break;
|
|
}
|
|
|
|
case NETMAP_REQ_SYNC_KLOOP_START: {
|
|
error = netmap_sync_kloop(priv, hdr);
|
|
break;
|
|
}
|
|
|
|
case NETMAP_REQ_SYNC_KLOOP_STOP: {
|
|
error = netmap_sync_kloop_stop(priv);
|
|
break;
|
|
}
|
|
|
|
default: {
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
}
|
|
/* Write back request body to userspace and reset the
|
|
* user-space pointer. */
|
|
error = nmreq_copyout(hdr, error);
|
|
break;
|
|
}
|
|
|
|
case NIOCTXSYNC:
|
|
case NIOCRXSYNC: {
|
|
if (unlikely(priv->np_nifp == NULL)) {
|
|
error = ENXIO;
|
|
break;
|
|
}
|
|
mb(); /* make sure following reads are not from cache */
|
|
|
|
if (unlikely(priv->np_csb_atok_base)) {
|
|
nm_prerr("Invalid sync in CSB mode");
|
|
error = EBUSY;
|
|
break;
|
|
}
|
|
|
|
na = priv->np_na; /* we have a reference */
|
|
|
|
mbq_init(&q);
|
|
t = (cmd == NIOCTXSYNC ? NR_TX : NR_RX);
|
|
krings = NMR(na, t);
|
|
qfirst = priv->np_qfirst[t];
|
|
qlast = priv->np_qlast[t];
|
|
sync_flags = priv->np_sync_flags;
|
|
|
|
for (i = qfirst; i < qlast; i++) {
|
|
struct netmap_kring *kring = krings[i];
|
|
struct netmap_ring *ring = kring->ring;
|
|
|
|
if (unlikely(nm_kr_tryget(kring, 1, &error))) {
|
|
error = (error ? EIO : 0);
|
|
continue;
|
|
}
|
|
|
|
if (cmd == NIOCTXSYNC) {
|
|
if (netmap_debug & NM_DEBUG_TXSYNC)
|
|
nm_prinf("pre txsync ring %d cur %d hwcur %d",
|
|
i, ring->cur,
|
|
kring->nr_hwcur);
|
|
if (nm_txsync_prologue(kring, ring) >= kring->nkr_num_slots) {
|
|
netmap_ring_reinit(kring);
|
|
} else if (kring->nm_sync(kring, sync_flags | NAF_FORCE_RECLAIM) == 0) {
|
|
nm_sync_finalize(kring);
|
|
}
|
|
if (netmap_debug & NM_DEBUG_TXSYNC)
|
|
nm_prinf("post txsync ring %d cur %d hwcur %d",
|
|
i, ring->cur,
|
|
kring->nr_hwcur);
|
|
} else {
|
|
if (nm_rxsync_prologue(kring, ring) >= kring->nkr_num_slots) {
|
|
netmap_ring_reinit(kring);
|
|
}
|
|
if (nm_may_forward_up(kring)) {
|
|
/* transparent forwarding, see netmap_poll() */
|
|
netmap_grab_packets(kring, &q, netmap_fwd);
|
|
}
|
|
if (kring->nm_sync(kring, sync_flags | NAF_FORCE_READ) == 0) {
|
|
nm_sync_finalize(kring);
|
|
}
|
|
ring_timestamp_set(ring);
|
|
}
|
|
nm_kr_put(kring);
|
|
}
|
|
|
|
if (mbq_peek(&q)) {
|
|
netmap_send_up(na->ifp, &q);
|
|
}
|
|
|
|
break;
|
|
}
|
|
|
|
default: {
|
|
return netmap_ioctl_legacy(priv, cmd, data, td);
|
|
break;
|
|
}
|
|
}
|
|
|
|
return (error);
|
|
}
|
|
|
|
size_t
|
|
nmreq_size_by_type(uint16_t nr_reqtype)
|
|
{
|
|
switch (nr_reqtype) {
|
|
case NETMAP_REQ_REGISTER:
|
|
return sizeof(struct nmreq_register);
|
|
case NETMAP_REQ_PORT_INFO_GET:
|
|
return sizeof(struct nmreq_port_info_get);
|
|
case NETMAP_REQ_VALE_ATTACH:
|
|
return sizeof(struct nmreq_vale_attach);
|
|
case NETMAP_REQ_VALE_DETACH:
|
|
return sizeof(struct nmreq_vale_detach);
|
|
case NETMAP_REQ_VALE_LIST:
|
|
return sizeof(struct nmreq_vale_list);
|
|
case NETMAP_REQ_PORT_HDR_SET:
|
|
case NETMAP_REQ_PORT_HDR_GET:
|
|
return sizeof(struct nmreq_port_hdr);
|
|
case NETMAP_REQ_VALE_NEWIF:
|
|
return sizeof(struct nmreq_vale_newif);
|
|
case NETMAP_REQ_VALE_DELIF:
|
|
case NETMAP_REQ_SYNC_KLOOP_STOP:
|
|
case NETMAP_REQ_CSB_ENABLE:
|
|
return 0;
|
|
case NETMAP_REQ_VALE_POLLING_ENABLE:
|
|
case NETMAP_REQ_VALE_POLLING_DISABLE:
|
|
return sizeof(struct nmreq_vale_polling);
|
|
case NETMAP_REQ_POOLS_INFO_GET:
|
|
return sizeof(struct nmreq_pools_info);
|
|
case NETMAP_REQ_SYNC_KLOOP_START:
|
|
return sizeof(struct nmreq_sync_kloop_start);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static size_t
|
|
nmreq_opt_size_by_type(uint32_t nro_reqtype, uint64_t nro_size)
|
|
{
|
|
size_t rv = sizeof(struct nmreq_option);
|
|
#ifdef NETMAP_REQ_OPT_DEBUG
|
|
if (nro_reqtype & NETMAP_REQ_OPT_DEBUG)
|
|
return (nro_reqtype & ~NETMAP_REQ_OPT_DEBUG);
|
|
#endif /* NETMAP_REQ_OPT_DEBUG */
|
|
switch (nro_reqtype) {
|
|
#ifdef WITH_EXTMEM
|
|
case NETMAP_REQ_OPT_EXTMEM:
|
|
rv = sizeof(struct nmreq_opt_extmem);
|
|
break;
|
|
#endif /* WITH_EXTMEM */
|
|
case NETMAP_REQ_OPT_SYNC_KLOOP_EVENTFDS:
|
|
if (nro_size >= rv)
|
|
rv = nro_size;
|
|
break;
|
|
case NETMAP_REQ_OPT_CSB:
|
|
rv = sizeof(struct nmreq_opt_csb);
|
|
break;
|
|
case NETMAP_REQ_OPT_SYNC_KLOOP_MODE:
|
|
rv = sizeof(struct nmreq_opt_sync_kloop_mode);
|
|
break;
|
|
}
|
|
/* subtract the common header */
|
|
return rv - sizeof(struct nmreq_option);
|
|
}
|
|
|
|
/*
|
|
* nmreq_copyin: create an in-kernel version of the request.
|
|
*
|
|
* We build the following data structure:
|
|
*
|
|
* hdr -> +-------+ buf
|
|
* | | +---------------+
|
|
* +-------+ |usr body ptr |
|
|
* |options|-. +---------------+
|
|
* +-------+ | |usr options ptr|
|
|
* |body |--------->+---------------+
|
|
* +-------+ | | |
|
|
* | | copy of body |
|
|
* | | |
|
|
* | +---------------+
|
|
* | | NULL |
|
|
* | +---------------+
|
|
* | .---| |\
|
|
* | | +---------------+ |
|
|
* | .------| | |
|
|
* | | | +---------------+ \ option table
|
|
* | | | | ... | / indexed by option
|
|
* | | | +---------------+ | type
|
|
* | | | | | |
|
|
* | | | +---------------+/
|
|
* | | | |usr next ptr 1 |
|
|
* `-|----->+---------------+
|
|
* | | | copy of opt 1 |
|
|
* | | | |
|
|
* | | .-| nro_next |
|
|
* | | | +---------------+
|
|
* | | | |usr next ptr 2 |
|
|
* | `-`>+---------------+
|
|
* | | copy of opt 2 |
|
|
* | | |
|
|
* | .-| nro_next |
|
|
* | | +---------------+
|
|
* | | | |
|
|
* ~ ~ ~ ... ~
|
|
* | .-| |
|
|
* `----->+---------------+
|
|
* | |usr next ptr n |
|
|
* `>+---------------+
|
|
* | copy of opt n |
|
|
* | |
|
|
* | nro_next(NULL)|
|
|
* +---------------+
|
|
*
|
|
* The options and body fields of the hdr structure are overwritten
|
|
* with in-kernel valid pointers inside the buf. The original user
|
|
* pointers are saved in the buf and restored on copyout.
|
|
* The list of options is copied and the pointers adjusted. The
|
|
* original pointers are saved before the option they belonged.
|
|
*
|
|
* The option table has an entry for every availabe option. Entries
|
|
* for options that have not been passed contain NULL.
|
|
*
|
|
*/
|
|
|
|
int
|
|
nmreq_copyin(struct nmreq_header *hdr, int nr_body_is_user)
|
|
{
|
|
size_t rqsz, optsz, bufsz;
|
|
int error = 0;
|
|
char *ker = NULL, *p;
|
|
struct nmreq_option **next, *src, **opt_tab;
|
|
struct nmreq_option buf;
|
|
uint64_t *ptrs;
|
|
|
|
if (hdr->nr_reserved) {
|
|
if (netmap_verbose)
|
|
nm_prerr("nr_reserved must be zero");
|
|
return EINVAL;
|
|
}
|
|
|
|
if (!nr_body_is_user)
|
|
return 0;
|
|
|
|
hdr->nr_reserved = nr_body_is_user;
|
|
|
|
/* compute the total size of the buffer */
|
|
rqsz = nmreq_size_by_type(hdr->nr_reqtype);
|
|
if (rqsz > NETMAP_REQ_MAXSIZE) {
|
|
error = EMSGSIZE;
|
|
goto out_err;
|
|
}
|
|
if ((rqsz && hdr->nr_body == (uintptr_t)NULL) ||
|
|
(!rqsz && hdr->nr_body != (uintptr_t)NULL)) {
|
|
/* Request body expected, but not found; or
|
|
* request body found but unexpected. */
|
|
if (netmap_verbose)
|
|
nm_prerr("nr_body expected but not found, or vice versa");
|
|
error = EINVAL;
|
|
goto out_err;
|
|
}
|
|
|
|
bufsz = 2 * sizeof(void *) + rqsz +
|
|
NETMAP_REQ_OPT_MAX * sizeof(opt_tab);
|
|
/* compute the size of the buf below the option table.
|
|
* It must contain a copy of every received option structure.
|
|
* For every option we also need to store a copy of the user
|
|
* list pointer.
|
|
*/
|
|
optsz = 0;
|
|
for (src = (struct nmreq_option *)(uintptr_t)hdr->nr_options; src;
|
|
src = (struct nmreq_option *)(uintptr_t)buf.nro_next)
|
|
{
|
|
error = copyin(src, &buf, sizeof(*src));
|
|
if (error)
|
|
goto out_err;
|
|
optsz += sizeof(*src);
|
|
optsz += nmreq_opt_size_by_type(buf.nro_reqtype, buf.nro_size);
|
|
if (rqsz + optsz > NETMAP_REQ_MAXSIZE) {
|
|
error = EMSGSIZE;
|
|
goto out_err;
|
|
}
|
|
bufsz += sizeof(void *);
|
|
}
|
|
bufsz += optsz;
|
|
|
|
ker = nm_os_malloc(bufsz);
|
|
if (ker == NULL) {
|
|
error = ENOMEM;
|
|
goto out_err;
|
|
}
|
|
p = ker; /* write pointer into the buffer */
|
|
|
|
/* make a copy of the user pointers */
|
|
ptrs = (uint64_t*)p;
|
|
*ptrs++ = hdr->nr_body;
|
|
*ptrs++ = hdr->nr_options;
|
|
p = (char *)ptrs;
|
|
|
|
/* copy the body */
|
|
error = copyin((void *)(uintptr_t)hdr->nr_body, p, rqsz);
|
|
if (error)
|
|
goto out_restore;
|
|
/* overwrite the user pointer with the in-kernel one */
|
|
hdr->nr_body = (uintptr_t)p;
|
|
p += rqsz;
|
|
/* start of the options table */
|
|
opt_tab = (struct nmreq_option **)p;
|
|
p += sizeof(opt_tab) * NETMAP_REQ_OPT_MAX;
|
|
|
|
/* copy the options */
|
|
next = (struct nmreq_option **)&hdr->nr_options;
|
|
src = *next;
|
|
while (src) {
|
|
struct nmreq_option *opt;
|
|
|
|
/* copy the option header */
|
|
ptrs = (uint64_t *)p;
|
|
opt = (struct nmreq_option *)(ptrs + 1);
|
|
error = copyin(src, opt, sizeof(*src));
|
|
if (error)
|
|
goto out_restore;
|
|
/* make a copy of the user next pointer */
|
|
*ptrs = opt->nro_next;
|
|
/* overwrite the user pointer with the in-kernel one */
|
|
*next = opt;
|
|
|
|
/* initialize the option as not supported.
|
|
* Recognized options will update this field.
|
|
*/
|
|
opt->nro_status = EOPNOTSUPP;
|
|
|
|
/* check for invalid types */
|
|
if (opt->nro_reqtype < 1) {
|
|
if (netmap_verbose)
|
|
nm_prinf("invalid option type: %u", opt->nro_reqtype);
|
|
opt->nro_status = EINVAL;
|
|
error = EINVAL;
|
|
goto next;
|
|
}
|
|
|
|
if (opt->nro_reqtype >= NETMAP_REQ_OPT_MAX) {
|
|
/* opt->nro_status is already EOPNOTSUPP */
|
|
error = EOPNOTSUPP;
|
|
goto next;
|
|
}
|
|
|
|
/* if the type is valid, index the option in the table
|
|
* unless it is a duplicate.
|
|
*/
|
|
if (opt_tab[opt->nro_reqtype] != NULL) {
|
|
if (netmap_verbose)
|
|
nm_prinf("duplicate option: %u", opt->nro_reqtype);
|
|
opt->nro_status = EINVAL;
|
|
opt_tab[opt->nro_reqtype]->nro_status = EINVAL;
|
|
error = EINVAL;
|
|
goto next;
|
|
}
|
|
opt_tab[opt->nro_reqtype] = opt;
|
|
|
|
p = (char *)(opt + 1);
|
|
|
|
/* copy the option body */
|
|
optsz = nmreq_opt_size_by_type(opt->nro_reqtype,
|
|
opt->nro_size);
|
|
if (optsz) {
|
|
/* the option body follows the option header */
|
|
error = copyin(src + 1, p, optsz);
|
|
if (error)
|
|
goto out_restore;
|
|
p += optsz;
|
|
}
|
|
|
|
next:
|
|
/* move to next option */
|
|
next = (struct nmreq_option **)&opt->nro_next;
|
|
src = *next;
|
|
}
|
|
if (error)
|
|
nmreq_copyout(hdr, error);
|
|
return error;
|
|
|
|
out_restore:
|
|
ptrs = (uint64_t *)ker;
|
|
hdr->nr_body = *ptrs++;
|
|
hdr->nr_options = *ptrs++;
|
|
hdr->nr_reserved = 0;
|
|
nm_os_free(ker);
|
|
out_err:
|
|
return error;
|
|
}
|
|
|
|
static int
|
|
nmreq_copyout(struct nmreq_header *hdr, int rerror)
|
|
{
|
|
struct nmreq_option *src, *dst;
|
|
void *ker = (void *)(uintptr_t)hdr->nr_body, *bufstart;
|
|
uint64_t *ptrs;
|
|
size_t bodysz;
|
|
int error;
|
|
|
|
if (!hdr->nr_reserved)
|
|
return rerror;
|
|
|
|
/* restore the user pointers in the header */
|
|
ptrs = (uint64_t *)ker - 2;
|
|
bufstart = ptrs;
|
|
hdr->nr_body = *ptrs++;
|
|
src = (struct nmreq_option *)(uintptr_t)hdr->nr_options;
|
|
hdr->nr_options = *ptrs;
|
|
|
|
if (!rerror) {
|
|
/* copy the body */
|
|
bodysz = nmreq_size_by_type(hdr->nr_reqtype);
|
|
error = copyout(ker, (void *)(uintptr_t)hdr->nr_body, bodysz);
|
|
if (error) {
|
|
rerror = error;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
/* copy the options */
|
|
dst = (struct nmreq_option *)(uintptr_t)hdr->nr_options;
|
|
while (src) {
|
|
size_t optsz;
|
|
uint64_t next;
|
|
|
|
/* restore the user pointer */
|
|
next = src->nro_next;
|
|
ptrs = (uint64_t *)src - 1;
|
|
src->nro_next = *ptrs;
|
|
|
|
/* always copy the option header */
|
|
error = copyout(src, dst, sizeof(*src));
|
|
if (error) {
|
|
rerror = error;
|
|
goto out;
|
|
}
|
|
|
|
/* copy the option body only if there was no error */
|
|
if (!rerror && !src->nro_status) {
|
|
optsz = nmreq_opt_size_by_type(src->nro_reqtype,
|
|
src->nro_size);
|
|
if (optsz) {
|
|
error = copyout(src + 1, dst + 1, optsz);
|
|
if (error) {
|
|
rerror = error;
|
|
goto out;
|
|
}
|
|
}
|
|
}
|
|
src = (struct nmreq_option *)(uintptr_t)next;
|
|
dst = (struct nmreq_option *)(uintptr_t)*ptrs;
|
|
}
|
|
|
|
|
|
out:
|
|
hdr->nr_reserved = 0;
|
|
nm_os_free(bufstart);
|
|
return rerror;
|
|
}
|
|
|
|
struct nmreq_option *
|
|
nmreq_getoption(struct nmreq_header *hdr, uint16_t reqtype)
|
|
{
|
|
struct nmreq_option **opt_tab;
|
|
|
|
if (!hdr->nr_options)
|
|
return NULL;
|
|
|
|
opt_tab = (struct nmreq_option **)((uintptr_t)hdr->nr_options) -
|
|
(NETMAP_REQ_OPT_MAX + 1);
|
|
return opt_tab[reqtype];
|
|
}
|
|
|
|
static int
|
|
nmreq_checkoptions(struct nmreq_header *hdr)
|
|
{
|
|
struct nmreq_option *opt;
|
|
/* return error if there is still any option
|
|
* marked as not supported
|
|
*/
|
|
|
|
for (opt = (struct nmreq_option *)(uintptr_t)hdr->nr_options; opt;
|
|
opt = (struct nmreq_option *)(uintptr_t)opt->nro_next)
|
|
if (opt->nro_status == EOPNOTSUPP)
|
|
return EOPNOTSUPP;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* select(2) and poll(2) handlers for the "netmap" device.
|
|
*
|
|
* Can be called for one or more queues.
|
|
* Return true the event mask corresponding to ready events.
|
|
* If there are no ready events (and 'sr' is not NULL), do a
|
|
* selrecord on either individual selinfo or on the global one.
|
|
* Device-dependent parts (locking and sync of tx/rx rings)
|
|
* are done through callbacks.
|
|
*
|
|
* On linux, arguments are really pwait, the poll table, and 'td' is struct file *
|
|
* The first one is remapped to pwait as selrecord() uses the name as an
|
|
* hidden argument.
|
|
*/
|
|
int
|
|
netmap_poll(struct netmap_priv_d *priv, int events, NM_SELRECORD_T *sr)
|
|
{
|
|
struct netmap_adapter *na;
|
|
struct netmap_kring *kring;
|
|
struct netmap_ring *ring;
|
|
u_int i, want[NR_TXRX], revents = 0;
|
|
NM_SELINFO_T *si[NR_TXRX];
|
|
#define want_tx want[NR_TX]
|
|
#define want_rx want[NR_RX]
|
|
struct mbq q; /* packets from RX hw queues to host stack */
|
|
|
|
/*
|
|
* In order to avoid nested locks, we need to "double check"
|
|
* txsync and rxsync if we decide to do a selrecord().
|
|
* retry_tx (and retry_rx, later) prevent looping forever.
|
|
*/
|
|
int retry_tx = 1, retry_rx = 1;
|
|
|
|
/* Transparent mode: send_down is 1 if we have found some
|
|
* packets to forward (host RX ring --> NIC) during the rx
|
|
* scan and we have not sent them down to the NIC yet.
|
|
* Transparent mode requires to bind all rings to a single
|
|
* file descriptor.
|
|
*/
|
|
int send_down = 0;
|
|
int sync_flags = priv->np_sync_flags;
|
|
|
|
mbq_init(&q);
|
|
|
|
if (unlikely(priv->np_nifp == NULL)) {
|
|
return POLLERR;
|
|
}
|
|
mb(); /* make sure following reads are not from cache */
|
|
|
|
na = priv->np_na;
|
|
|
|
if (unlikely(!nm_netmap_on(na)))
|
|
return POLLERR;
|
|
|
|
if (unlikely(priv->np_csb_atok_base)) {
|
|
nm_prerr("Invalid poll in CSB mode");
|
|
return POLLERR;
|
|
}
|
|
|
|
if (netmap_debug & NM_DEBUG_ON)
|
|
nm_prinf("device %s events 0x%x", na->name, events);
|
|
want_tx = events & (POLLOUT | POLLWRNORM);
|
|
want_rx = events & (POLLIN | POLLRDNORM);
|
|
|
|
/*
|
|
* If the card has more than one queue AND the file descriptor is
|
|
* bound to all of them, we sleep on the "global" selinfo, otherwise
|
|
* we sleep on individual selinfo (FreeBSD only allows two selinfo's
|
|
* per file descriptor).
|
|
* The interrupt routine in the driver wake one or the other
|
|
* (or both) depending on which clients are active.
|
|
*
|
|
* rxsync() is only called if we run out of buffers on a POLLIN.
|
|
* txsync() is called if we run out of buffers on POLLOUT, or
|
|
* there are pending packets to send. The latter can be disabled
|
|
* passing NETMAP_NO_TX_POLL in the NIOCREG call.
|
|
*/
|
|
si[NR_RX] = priv->np_si[NR_RX];
|
|
si[NR_TX] = priv->np_si[NR_TX];
|
|
|
|
#ifdef __FreeBSD__
|
|
/*
|
|
* We start with a lock free round which is cheap if we have
|
|
* slots available. If this fails, then lock and call the sync
|
|
* routines. We can't do this on Linux, as the contract says
|
|
* that we must call nm_os_selrecord() unconditionally.
|
|
*/
|
|
if (want_tx) {
|
|
const enum txrx t = NR_TX;
|
|
for (i = priv->np_qfirst[t]; i < priv->np_qlast[t]; i++) {
|
|
kring = NMR(na, t)[i];
|
|
if (kring->ring->cur != kring->ring->tail) {
|
|
/* Some unseen TX space is available, so what
|
|
* we don't need to run txsync. */
|
|
revents |= want[t];
|
|
want[t] = 0;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
if (want_rx) {
|
|
const enum txrx t = NR_RX;
|
|
int rxsync_needed = 0;
|
|
|
|
for (i = priv->np_qfirst[t]; i < priv->np_qlast[t]; i++) {
|
|
kring = NMR(na, t)[i];
|
|
if (kring->ring->cur == kring->ring->tail
|
|
|| kring->rhead != kring->ring->head) {
|
|
/* There are no unseen packets on this ring,
|
|
* or there are some buffers to be returned
|
|
* to the netmap port. We therefore go ahead
|
|
* and run rxsync. */
|
|
rxsync_needed = 1;
|
|
break;
|
|
}
|
|
}
|
|
if (!rxsync_needed) {
|
|
revents |= want_rx;
|
|
want_rx = 0;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
#ifdef linux
|
|
/* The selrecord must be unconditional on linux. */
|
|
nm_os_selrecord(sr, si[NR_RX]);
|
|
nm_os_selrecord(sr, si[NR_TX]);
|
|
#endif /* linux */
|
|
|
|
/*
|
|
* If we want to push packets out (priv->np_txpoll) or
|
|
* want_tx is still set, we must issue txsync calls
|
|
* (on all rings, to avoid that the tx rings stall).
|
|
* Fortunately, normal tx mode has np_txpoll set.
|
|
*/
|
|
if (priv->np_txpoll || want_tx) {
|
|
/*
|
|
* The first round checks if anyone is ready, if not
|
|
* do a selrecord and another round to handle races.
|
|
* want_tx goes to 0 if any space is found, and is
|
|
* used to skip rings with no pending transmissions.
|
|
*/
|
|
flush_tx:
|
|
for (i = priv->np_qfirst[NR_TX]; i < priv->np_qlast[NR_TX]; i++) {
|
|
int found = 0;
|
|
|
|
kring = na->tx_rings[i];
|
|
ring = kring->ring;
|
|
|
|
/*
|
|
* Don't try to txsync this TX ring if we already found some
|
|
* space in some of the TX rings (want_tx == 0) and there are no
|
|
* TX slots in this ring that need to be flushed to the NIC
|
|
* (head == hwcur).
|
|
*/
|
|
if (!send_down && !want_tx && ring->head == kring->nr_hwcur)
|
|
continue;
|
|
|
|
if (nm_kr_tryget(kring, 1, &revents))
|
|
continue;
|
|
|
|
if (nm_txsync_prologue(kring, ring) >= kring->nkr_num_slots) {
|
|
netmap_ring_reinit(kring);
|
|
revents |= POLLERR;
|
|
} else {
|
|
if (kring->nm_sync(kring, sync_flags))
|
|
revents |= POLLERR;
|
|
else
|
|
nm_sync_finalize(kring);
|
|
}
|
|
|
|
/*
|
|
* If we found new slots, notify potential
|
|
* listeners on the same ring.
|
|
* Since we just did a txsync, look at the copies
|
|
* of cur,tail in the kring.
|
|
*/
|
|
found = kring->rcur != kring->rtail;
|
|
nm_kr_put(kring);
|
|
if (found) { /* notify other listeners */
|
|
revents |= want_tx;
|
|
want_tx = 0;
|
|
#ifndef linux
|
|
kring->nm_notify(kring, 0);
|
|
#endif /* linux */
|
|
}
|
|
}
|
|
/* if there were any packet to forward we must have handled them by now */
|
|
send_down = 0;
|
|
if (want_tx && retry_tx && sr) {
|
|
#ifndef linux
|
|
nm_os_selrecord(sr, si[NR_TX]);
|
|
#endif /* !linux */
|
|
retry_tx = 0;
|
|
goto flush_tx;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* If want_rx is still set scan receive rings.
|
|
* Do it on all rings because otherwise we starve.
|
|
*/
|
|
if (want_rx) {
|
|
/* two rounds here for race avoidance */
|
|
do_retry_rx:
|
|
for (i = priv->np_qfirst[NR_RX]; i < priv->np_qlast[NR_RX]; i++) {
|
|
int found = 0;
|
|
|
|
kring = na->rx_rings[i];
|
|
ring = kring->ring;
|
|
|
|
if (unlikely(nm_kr_tryget(kring, 1, &revents)))
|
|
continue;
|
|
|
|
if (nm_rxsync_prologue(kring, ring) >= kring->nkr_num_slots) {
|
|
netmap_ring_reinit(kring);
|
|
revents |= POLLERR;
|
|
}
|
|
/* now we can use kring->rcur, rtail */
|
|
|
|
/*
|
|
* transparent mode support: collect packets from
|
|
* hw rxring(s) that have been released by the user
|
|
*/
|
|
if (nm_may_forward_up(kring)) {
|
|
netmap_grab_packets(kring, &q, netmap_fwd);
|
|
}
|
|
|
|
/* Clear the NR_FORWARD flag anyway, it may be set by
|
|
* the nm_sync() below only on for the host RX ring (see
|
|
* netmap_rxsync_from_host()). */
|
|
kring->nr_kflags &= ~NR_FORWARD;
|
|
if (kring->nm_sync(kring, sync_flags))
|
|
revents |= POLLERR;
|
|
else
|
|
nm_sync_finalize(kring);
|
|
send_down |= (kring->nr_kflags & NR_FORWARD);
|
|
ring_timestamp_set(ring);
|
|
found = kring->rcur != kring->rtail;
|
|
nm_kr_put(kring);
|
|
if (found) {
|
|
revents |= want_rx;
|
|
retry_rx = 0;
|
|
#ifndef linux
|
|
kring->nm_notify(kring, 0);
|
|
#endif /* linux */
|
|
}
|
|
}
|
|
|
|
#ifndef linux
|
|
if (retry_rx && sr) {
|
|
nm_os_selrecord(sr, si[NR_RX]);
|
|
}
|
|
#endif /* !linux */
|
|
if (send_down || retry_rx) {
|
|
retry_rx = 0;
|
|
if (send_down)
|
|
goto flush_tx; /* and retry_rx */
|
|
else
|
|
goto do_retry_rx;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Transparent mode: released bufs (i.e. between kring->nr_hwcur and
|
|
* ring->head) marked with NS_FORWARD on hw rx rings are passed up
|
|
* to the host stack.
|
|
*/
|
|
|
|
if (mbq_peek(&q)) {
|
|
netmap_send_up(na->ifp, &q);
|
|
}
|
|
|
|
return (revents);
|
|
#undef want_tx
|
|
#undef want_rx
|
|
}
|
|
|
|
int
|
|
nma_intr_enable(struct netmap_adapter *na, int onoff)
|
|
{
|
|
bool changed = false;
|
|
enum txrx t;
|
|
int i;
|
|
|
|
for_rx_tx(t) {
|
|
for (i = 0; i < nma_get_nrings(na, t); i++) {
|
|
struct netmap_kring *kring = NMR(na, t)[i];
|
|
int on = !(kring->nr_kflags & NKR_NOINTR);
|
|
|
|
if (!!onoff != !!on) {
|
|
changed = true;
|
|
}
|
|
if (onoff) {
|
|
kring->nr_kflags &= ~NKR_NOINTR;
|
|
} else {
|
|
kring->nr_kflags |= NKR_NOINTR;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (!changed) {
|
|
return 0; /* nothing to do */
|
|
}
|
|
|
|
if (!na->nm_intr) {
|
|
nm_prerr("Cannot %s interrupts for %s", onoff ? "enable" : "disable",
|
|
na->name);
|
|
return -1;
|
|
}
|
|
|
|
na->nm_intr(na, onoff);
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
/*-------------------- driver support routines -------------------*/
|
|
|
|
/* default notify callback */
|
|
static int
|
|
netmap_notify(struct netmap_kring *kring, int flags)
|
|
{
|
|
struct netmap_adapter *na = kring->notify_na;
|
|
enum txrx t = kring->tx;
|
|
|
|
nm_os_selwakeup(&kring->si);
|
|
/* optimization: avoid a wake up on the global
|
|
* queue if nobody has registered for more
|
|
* than one ring
|
|
*/
|
|
if (na->si_users[t] > 0)
|
|
nm_os_selwakeup(&na->si[t]);
|
|
|
|
return NM_IRQ_COMPLETED;
|
|
}
|
|
|
|
/* called by all routines that create netmap_adapters.
|
|
* provide some defaults and get a reference to the
|
|
* memory allocator
|
|
*/
|
|
int
|
|
netmap_attach_common(struct netmap_adapter *na)
|
|
{
|
|
if (!na->rx_buf_maxsize) {
|
|
/* Set a conservative default (larger is safer). */
|
|
na->rx_buf_maxsize = PAGE_SIZE;
|
|
}
|
|
|
|
#ifdef __FreeBSD__
|
|
if (na->na_flags & NAF_HOST_RINGS && na->ifp) {
|
|
na->if_input = na->ifp->if_input; /* for netmap_send_up */
|
|
}
|
|
na->pdev = na; /* make sure netmap_mem_map() is called */
|
|
#endif /* __FreeBSD__ */
|
|
if (na->na_flags & NAF_HOST_RINGS) {
|
|
if (na->num_host_rx_rings == 0)
|
|
na->num_host_rx_rings = 1;
|
|
if (na->num_host_tx_rings == 0)
|
|
na->num_host_tx_rings = 1;
|
|
}
|
|
if (na->nm_krings_create == NULL) {
|
|
/* we assume that we have been called by a driver,
|
|
* since other port types all provide their own
|
|
* nm_krings_create
|
|
*/
|
|
na->nm_krings_create = netmap_hw_krings_create;
|
|
na->nm_krings_delete = netmap_hw_krings_delete;
|
|
}
|
|
if (na->nm_notify == NULL)
|
|
na->nm_notify = netmap_notify;
|
|
na->active_fds = 0;
|
|
|
|
if (na->nm_mem == NULL) {
|
|
/* use the global allocator */
|
|
na->nm_mem = netmap_mem_get(&nm_mem);
|
|
}
|
|
#ifdef WITH_VALE
|
|
if (na->nm_bdg_attach == NULL)
|
|
/* no special nm_bdg_attach callback. On VALE
|
|
* attach, we need to interpose a bwrap
|
|
*/
|
|
na->nm_bdg_attach = netmap_default_bdg_attach;
|
|
#endif
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Wrapper for the register callback provided netmap-enabled
|
|
* hardware drivers.
|
|
* nm_iszombie(na) means that the driver module has been
|
|
* unloaded, so we cannot call into it.
|
|
* nm_os_ifnet_lock() must guarantee mutual exclusion with
|
|
* module unloading.
|
|
*/
|
|
static int
|
|
netmap_hw_reg(struct netmap_adapter *na, int onoff)
|
|
{
|
|
struct netmap_hw_adapter *hwna =
|
|
(struct netmap_hw_adapter*)na;
|
|
int error = 0;
|
|
|
|
nm_os_ifnet_lock();
|
|
|
|
if (nm_iszombie(na)) {
|
|
if (onoff) {
|
|
error = ENXIO;
|
|
} else if (na != NULL) {
|
|
na->na_flags &= ~NAF_NETMAP_ON;
|
|
}
|
|
goto out;
|
|
}
|
|
|
|
error = hwna->nm_hw_register(na, onoff);
|
|
|
|
out:
|
|
nm_os_ifnet_unlock();
|
|
|
|
return error;
|
|
}
|
|
|
|
static void
|
|
netmap_hw_dtor(struct netmap_adapter *na)
|
|
{
|
|
if (na->ifp == NULL)
|
|
return;
|
|
|
|
NM_DETACH_NA(na->ifp);
|
|
}
|
|
|
|
|
|
/*
|
|
* Allocate a netmap_adapter object, and initialize it from the
|
|
* 'arg' passed by the driver on attach.
|
|
* We allocate a block of memory of 'size' bytes, which has room
|
|
* for struct netmap_adapter plus additional room private to
|
|
* the caller.
|
|
* Return 0 on success, ENOMEM otherwise.
|
|
*/
|
|
int
|
|
netmap_attach_ext(struct netmap_adapter *arg, size_t size, int override_reg)
|
|
{
|
|
struct netmap_hw_adapter *hwna = NULL;
|
|
struct ifnet *ifp = NULL;
|
|
|
|
if (size < sizeof(struct netmap_hw_adapter)) {
|
|
if (netmap_debug & NM_DEBUG_ON)
|
|
nm_prerr("Invalid netmap adapter size %d", (int)size);
|
|
return EINVAL;
|
|
}
|
|
|
|
if (arg == NULL || arg->ifp == NULL) {
|
|
if (netmap_debug & NM_DEBUG_ON)
|
|
nm_prerr("either arg or arg->ifp is NULL");
|
|
return EINVAL;
|
|
}
|
|
|
|
if (arg->num_tx_rings == 0 || arg->num_rx_rings == 0) {
|
|
if (netmap_debug & NM_DEBUG_ON)
|
|
nm_prerr("%s: invalid rings tx %d rx %d",
|
|
arg->name, arg->num_tx_rings, arg->num_rx_rings);
|
|
return EINVAL;
|
|
}
|
|
|
|
ifp = arg->ifp;
|
|
if (NM_NA_CLASH(ifp)) {
|
|
/* If NA(ifp) is not null but there is no valid netmap
|
|
* adapter it means that someone else is using the same
|
|
* pointer (e.g. ax25_ptr on linux). This happens for
|
|
* instance when also PF_RING is in use. */
|
|
nm_prerr("Error: netmap adapter hook is busy");
|
|
return EBUSY;
|
|
}
|
|
|
|
hwna = nm_os_malloc(size);
|
|
if (hwna == NULL)
|
|
goto fail;
|
|
hwna->up = *arg;
|
|
hwna->up.na_flags |= NAF_HOST_RINGS | NAF_NATIVE;
|
|
strlcpy(hwna->up.name, ifp->if_xname, sizeof(hwna->up.name));
|
|
if (override_reg) {
|
|
hwna->nm_hw_register = hwna->up.nm_register;
|
|
hwna->up.nm_register = netmap_hw_reg;
|
|
}
|
|
if (netmap_attach_common(&hwna->up)) {
|
|
nm_os_free(hwna);
|
|
goto fail;
|
|
}
|
|
netmap_adapter_get(&hwna->up);
|
|
|
|
NM_ATTACH_NA(ifp, &hwna->up);
|
|
|
|
nm_os_onattach(ifp);
|
|
|
|
if (arg->nm_dtor == NULL) {
|
|
hwna->up.nm_dtor = netmap_hw_dtor;
|
|
}
|
|
|
|
if_printf(ifp, "netmap queues/slots: TX %d/%d, RX %d/%d\n",
|
|
hwna->up.num_tx_rings, hwna->up.num_tx_desc,
|
|
hwna->up.num_rx_rings, hwna->up.num_rx_desc);
|
|
return 0;
|
|
|
|
fail:
|
|
nm_prerr("fail, arg %p ifp %p na %p", arg, ifp, hwna);
|
|
return (hwna ? EINVAL : ENOMEM);
|
|
}
|
|
|
|
|
|
int
|
|
netmap_attach(struct netmap_adapter *arg)
|
|
{
|
|
return netmap_attach_ext(arg, sizeof(struct netmap_hw_adapter),
|
|
1 /* override nm_reg */);
|
|
}
|
|
|
|
|
|
void
|
|
NM_DBG(netmap_adapter_get)(struct netmap_adapter *na)
|
|
{
|
|
if (!na) {
|
|
return;
|
|
}
|
|
|
|
refcount_acquire(&na->na_refcount);
|
|
}
|
|
|
|
|
|
/* returns 1 iff the netmap_adapter is destroyed */
|
|
int
|
|
NM_DBG(netmap_adapter_put)(struct netmap_adapter *na)
|
|
{
|
|
if (!na)
|
|
return 1;
|
|
|
|
if (!refcount_release(&na->na_refcount))
|
|
return 0;
|
|
|
|
if (na->nm_dtor)
|
|
na->nm_dtor(na);
|
|
|
|
if (na->tx_rings) { /* XXX should not happen */
|
|
if (netmap_debug & NM_DEBUG_ON)
|
|
nm_prerr("freeing leftover tx_rings");
|
|
na->nm_krings_delete(na);
|
|
}
|
|
netmap_pipe_dealloc(na);
|
|
if (na->nm_mem)
|
|
netmap_mem_put(na->nm_mem);
|
|
bzero(na, sizeof(*na));
|
|
nm_os_free(na);
|
|
|
|
return 1;
|
|
}
|
|
|
|
/* nm_krings_create callback for all hardware native adapters */
|
|
int
|
|
netmap_hw_krings_create(struct netmap_adapter *na)
|
|
{
|
|
int ret = netmap_krings_create(na, 0);
|
|
if (ret == 0) {
|
|
/* initialize the mbq for the sw rx ring */
|
|
u_int lim = netmap_real_rings(na, NR_RX), i;
|
|
for (i = na->num_rx_rings; i < lim; i++) {
|
|
mbq_safe_init(&NMR(na, NR_RX)[i]->rx_queue);
|
|
}
|
|
nm_prdis("initialized sw rx queue %d", na->num_rx_rings);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
* Called on module unload by the netmap-enabled drivers
|
|
*/
|
|
void
|
|
netmap_detach(struct ifnet *ifp)
|
|
{
|
|
struct netmap_adapter *na = NA(ifp);
|
|
|
|
if (!na)
|
|
return;
|
|
|
|
NMG_LOCK();
|
|
netmap_set_all_rings(na, NM_KR_LOCKED);
|
|
/*
|
|
* if the netmap adapter is not native, somebody
|
|
* changed it, so we can not release it here.
|
|
* The NAF_ZOMBIE flag will notify the new owner that
|
|
* the driver is gone.
|
|
*/
|
|
if (!(na->na_flags & NAF_NATIVE) || !netmap_adapter_put(na)) {
|
|
na->na_flags |= NAF_ZOMBIE;
|
|
}
|
|
/* give active users a chance to notice that NAF_ZOMBIE has been
|
|
* turned on, so that they can stop and return an error to userspace.
|
|
* Note that this becomes a NOP if there are no active users and,
|
|
* therefore, the put() above has deleted the na, since now NA(ifp) is
|
|
* NULL.
|
|
*/
|
|
netmap_enable_all_rings(ifp);
|
|
NMG_UNLOCK();
|
|
}
|
|
|
|
|
|
/*
|
|
* Intercept packets from the network stack and pass them
|
|
* to netmap as incoming packets on the 'software' ring.
|
|
*
|
|
* We only store packets in a bounded mbq and then copy them
|
|
* in the relevant rxsync routine.
|
|
*
|
|
* We rely on the OS to make sure that the ifp and na do not go
|
|
* away (typically the caller checks for IFF_DRV_RUNNING or the like).
|
|
* In nm_register() or whenever there is a reinitialization,
|
|
* we make sure to make the mode change visible here.
|
|
*/
|
|
int
|
|
netmap_transmit(struct ifnet *ifp, struct mbuf *m)
|
|
{
|
|
struct netmap_adapter *na = NA(ifp);
|
|
struct netmap_kring *kring, *tx_kring;
|
|
u_int len = MBUF_LEN(m);
|
|
u_int error = ENOBUFS;
|
|
unsigned int txr;
|
|
struct mbq *q;
|
|
int busy;
|
|
u_int i;
|
|
|
|
i = MBUF_TXQ(m);
|
|
if (i >= na->num_host_rx_rings) {
|
|
i = i % na->num_host_rx_rings;
|
|
}
|
|
kring = NMR(na, NR_RX)[nma_get_nrings(na, NR_RX) + i];
|
|
|
|
// XXX [Linux] we do not need this lock
|
|
// if we follow the down/configure/up protocol -gl
|
|
// mtx_lock(&na->core_lock);
|
|
|
|
if (!nm_netmap_on(na)) {
|
|
nm_prerr("%s not in netmap mode anymore", na->name);
|
|
error = ENXIO;
|
|
goto done;
|
|
}
|
|
|
|
txr = MBUF_TXQ(m);
|
|
if (txr >= na->num_tx_rings) {
|
|
txr %= na->num_tx_rings;
|
|
}
|
|
tx_kring = NMR(na, NR_TX)[txr];
|
|
|
|
if (tx_kring->nr_mode == NKR_NETMAP_OFF) {
|
|
return MBUF_TRANSMIT(na, ifp, m);
|
|
}
|
|
|
|
q = &kring->rx_queue;
|
|
|
|
// XXX reconsider long packets if we handle fragments
|
|
if (len > NETMAP_BUF_SIZE(na)) { /* too long for us */
|
|
nm_prerr("%s from_host, drop packet size %d > %d", na->name,
|
|
len, NETMAP_BUF_SIZE(na));
|
|
goto done;
|
|
}
|
|
|
|
if (!netmap_generic_hwcsum) {
|
|
if (nm_os_mbuf_has_csum_offld(m)) {
|
|
nm_prlim(1, "%s drop mbuf that needs checksum offload", na->name);
|
|
goto done;
|
|
}
|
|
}
|
|
|
|
if (nm_os_mbuf_has_seg_offld(m)) {
|
|
nm_prlim(1, "%s drop mbuf that needs generic segmentation offload", na->name);
|
|
goto done;
|
|
}
|
|
|
|
#ifdef __FreeBSD__
|
|
ETHER_BPF_MTAP(ifp, m);
|
|
#endif /* __FreeBSD__ */
|
|
|
|
/* protect against netmap_rxsync_from_host(), netmap_sw_to_nic()
|
|
* and maybe other instances of netmap_transmit (the latter
|
|
* not possible on Linux).
|
|
* We enqueue the mbuf only if we are sure there is going to be
|
|
* enough room in the host RX ring, otherwise we drop it.
|
|
*/
|
|
mbq_lock(q);
|
|
|
|
busy = kring->nr_hwtail - kring->nr_hwcur;
|
|
if (busy < 0)
|
|
busy += kring->nkr_num_slots;
|
|
if (busy + mbq_len(q) >= kring->nkr_num_slots - 1) {
|
|
nm_prlim(2, "%s full hwcur %d hwtail %d qlen %d", na->name,
|
|
kring->nr_hwcur, kring->nr_hwtail, mbq_len(q));
|
|
} else {
|
|
mbq_enqueue(q, m);
|
|
nm_prdis(2, "%s %d bufs in queue", na->name, mbq_len(q));
|
|
/* notify outside the lock */
|
|
m = NULL;
|
|
error = 0;
|
|
}
|
|
mbq_unlock(q);
|
|
|
|
done:
|
|
if (m)
|
|
m_freem(m);
|
|
/* unconditionally wake up listeners */
|
|
kring->nm_notify(kring, 0);
|
|
/* this is normally netmap_notify(), but for nics
|
|
* connected to a bridge it is netmap_bwrap_intr_notify(),
|
|
* that possibly forwards the frames through the switch
|
|
*/
|
|
|
|
return (error);
|
|
}
|
|
|
|
|
|
/*
|
|
* Reset function to be called by the driver routines when reinitializing
|
|
* a hardware ring. The driver is in charge of locking to protect the kring
|
|
* while this operation is being performed. This is normally achieved by
|
|
* calling netmap_disable_all_rings() before triggering a reset.
|
|
* If the kring is not in netmap mode, return NULL to inform the caller
|
|
* that this is the case.
|
|
* If the kring is in netmap mode, set hwofs so that the netmap indices
|
|
* seen by userspace (head/cut/tail) do not change, although the internal
|
|
* NIC indices have been reset to 0.
|
|
* In any case, adjust kring->nr_mode.
|
|
*/
|
|
struct netmap_slot *
|
|
netmap_reset(struct netmap_adapter *na, enum txrx tx, u_int n,
|
|
u_int new_cur)
|
|
{
|
|
struct netmap_kring *kring;
|
|
u_int new_hwtail, new_hwofs;
|
|
|
|
if (!nm_native_on(na)) {
|
|
nm_prdis("interface not in native netmap mode");
|
|
return NULL; /* nothing to reinitialize */
|
|
}
|
|
|
|
if (tx == NR_TX) {
|
|
if (n >= na->num_tx_rings)
|
|
return NULL;
|
|
kring = na->tx_rings[n];
|
|
/*
|
|
* Set hwofs to rhead, so that slots[rhead] is mapped to
|
|
* the NIC internal slot 0, and thus the netmap buffer
|
|
* at rhead is the next to be transmitted. Transmissions
|
|
* that were pending before the reset are considered as
|
|
* sent, so that we can have hwcur = rhead. All the slots
|
|
* are now owned by the user, so we can also reinit hwtail.
|
|
*/
|
|
new_hwofs = kring->rhead;
|
|
new_hwtail = nm_prev(kring->rhead, kring->nkr_num_slots - 1);
|
|
} else {
|
|
if (n >= na->num_rx_rings)
|
|
return NULL;
|
|
kring = na->rx_rings[n];
|
|
/*
|
|
* Set hwofs to hwtail, so that slots[hwtail] is mapped to
|
|
* the NIC internal slot 0, and thus the netmap buffer
|
|
* at hwtail is the next to be given to the NIC.
|
|
* Unread slots (the ones in [rhead,hwtail[) are owned by
|
|
* the user, and thus the caller cannot give them
|
|
* to the NIC right now.
|
|
*/
|
|
new_hwofs = kring->nr_hwtail;
|
|
new_hwtail = kring->nr_hwtail;
|
|
}
|
|
if (kring->nr_pending_mode == NKR_NETMAP_OFF) {
|
|
kring->nr_mode = NKR_NETMAP_OFF;
|
|
return NULL;
|
|
}
|
|
if (netmap_verbose) {
|
|
nm_prinf("%s, hc %u->%u, ht %u->%u, ho %u->%u", kring->name,
|
|
kring->nr_hwcur, kring->rhead,
|
|
kring->nr_hwtail, new_hwtail,
|
|
kring->nkr_hwofs, new_hwofs);
|
|
}
|
|
kring->nr_hwcur = kring->rhead;
|
|
kring->nr_hwtail = new_hwtail;
|
|
kring->nkr_hwofs = new_hwofs;
|
|
|
|
/*
|
|
* Wakeup on the individual and global selwait
|
|
* We do the wakeup here, but the ring is not yet reconfigured.
|
|
* However, we are under lock so there are no races.
|
|
*/
|
|
kring->nr_mode = NKR_NETMAP_ON;
|
|
kring->nm_notify(kring, 0);
|
|
return kring->ring->slot;
|
|
}
|
|
|
|
|
|
/*
|
|
* Dispatch rx/tx interrupts to the netmap rings.
|
|
*
|
|
* "work_done" is non-null on the RX path, NULL for the TX path.
|
|
* We rely on the OS to make sure that there is only one active
|
|
* instance per queue, and that there is appropriate locking.
|
|
*
|
|
* The 'notify' routine depends on what the ring is attached to.
|
|
* - for a netmap file descriptor, do a selwakeup on the individual
|
|
* waitqueue, plus one on the global one if needed
|
|
* (see netmap_notify)
|
|
* - for a nic connected to a switch, call the proper forwarding routine
|
|
* (see netmap_bwrap_intr_notify)
|
|
*/
|
|
int
|
|
netmap_common_irq(struct netmap_adapter *na, u_int q, u_int *work_done)
|
|
{
|
|
struct netmap_kring *kring;
|
|
enum txrx t = (work_done ? NR_RX : NR_TX);
|
|
|
|
q &= NETMAP_RING_MASK;
|
|
|
|
if (netmap_debug & (NM_DEBUG_RXINTR|NM_DEBUG_TXINTR)) {
|
|
nm_prlim(5, "received %s queue %d", work_done ? "RX" : "TX" , q);
|
|
}
|
|
|
|
if (q >= nma_get_nrings(na, t))
|
|
return NM_IRQ_PASS; // not a physical queue
|
|
|
|
kring = NMR(na, t)[q];
|
|
|
|
if (kring->nr_mode == NKR_NETMAP_OFF) {
|
|
return NM_IRQ_PASS;
|
|
}
|
|
|
|
if (t == NR_RX) {
|
|
kring->nr_kflags |= NKR_PENDINTR; // XXX atomic ?
|
|
*work_done = 1; /* do not fire napi again */
|
|
}
|
|
|
|
return kring->nm_notify(kring, 0);
|
|
}
|
|
|
|
|
|
/*
|
|
* Default functions to handle rx/tx interrupts from a physical device.
|
|
* "work_done" is non-null on the RX path, NULL for the TX path.
|
|
*
|
|
* If the card is not in netmap mode, simply return NM_IRQ_PASS,
|
|
* so that the caller proceeds with regular processing.
|
|
* Otherwise call netmap_common_irq().
|
|
*
|
|
* If the card is connected to a netmap file descriptor,
|
|
* do a selwakeup on the individual queue, plus one on the global one
|
|
* if needed (multiqueue card _and_ there are multiqueue listeners),
|
|
* and return NR_IRQ_COMPLETED.
|
|
*
|
|
* Finally, if called on rx from an interface connected to a switch,
|
|
* calls the proper forwarding routine.
|
|
*/
|
|
int
|
|
netmap_rx_irq(struct ifnet *ifp, u_int q, u_int *work_done)
|
|
{
|
|
struct netmap_adapter *na = NA(ifp);
|
|
|
|
/*
|
|
* XXX emulated netmap mode sets NAF_SKIP_INTR so
|
|
* we still use the regular driver even though the previous
|
|
* check fails. It is unclear whether we should use
|
|
* nm_native_on() here.
|
|
*/
|
|
if (!nm_netmap_on(na))
|
|
return NM_IRQ_PASS;
|
|
|
|
if (na->na_flags & NAF_SKIP_INTR) {
|
|
nm_prdis("use regular interrupt");
|
|
return NM_IRQ_PASS;
|
|
}
|
|
|
|
return netmap_common_irq(na, q, work_done);
|
|
}
|
|
|
|
/* set/clear native flags and if_transmit/netdev_ops */
|
|
void
|
|
nm_set_native_flags(struct netmap_adapter *na)
|
|
{
|
|
struct ifnet *ifp = na->ifp;
|
|
|
|
/* We do the setup for intercepting packets only if we are the
|
|
* first user of this adapter. */
|
|
if (na->active_fds > 0) {
|
|
return;
|
|
}
|
|
|
|
na->na_flags |= NAF_NETMAP_ON;
|
|
nm_os_onenter(ifp);
|
|
nm_update_hostrings_mode(na);
|
|
}
|
|
|
|
void
|
|
nm_clear_native_flags(struct netmap_adapter *na)
|
|
{
|
|
struct ifnet *ifp = na->ifp;
|
|
|
|
/* We undo the setup for intercepting packets only if we are the
|
|
* last user of this adapter. */
|
|
if (na->active_fds > 0) {
|
|
return;
|
|
}
|
|
|
|
nm_update_hostrings_mode(na);
|
|
nm_os_onexit(ifp);
|
|
|
|
na->na_flags &= ~NAF_NETMAP_ON;
|
|
}
|
|
|
|
void
|
|
netmap_krings_mode_commit(struct netmap_adapter *na, int onoff)
|
|
{
|
|
enum txrx t;
|
|
|
|
for_rx_tx(t) {
|
|
int i;
|
|
|
|
for (i = 0; i < netmap_real_rings(na, t); i++) {
|
|
struct netmap_kring *kring = NMR(na, t)[i];
|
|
|
|
if (onoff && nm_kring_pending_on(kring))
|
|
kring->nr_mode = NKR_NETMAP_ON;
|
|
else if (!onoff && nm_kring_pending_off(kring))
|
|
kring->nr_mode = NKR_NETMAP_OFF;
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Module loader and unloader
|
|
*
|
|
* netmap_init() creates the /dev/netmap device and initializes
|
|
* all global variables. Returns 0 on success, errno on failure
|
|
* (but there is no chance)
|
|
*
|
|
* netmap_fini() destroys everything.
|
|
*/
|
|
|
|
static struct cdev *netmap_dev; /* /dev/netmap character device. */
|
|
extern struct cdevsw netmap_cdevsw;
|
|
|
|
|
|
void
|
|
netmap_fini(void)
|
|
{
|
|
if (netmap_dev)
|
|
destroy_dev(netmap_dev);
|
|
/* we assume that there are no longer netmap users */
|
|
nm_os_ifnet_fini();
|
|
netmap_uninit_bridges();
|
|
netmap_mem_fini();
|
|
NMG_LOCK_DESTROY();
|
|
nm_prinf("netmap: unloaded module.");
|
|
}
|
|
|
|
|
|
int
|
|
netmap_init(void)
|
|
{
|
|
int error;
|
|
|
|
NMG_LOCK_INIT();
|
|
|
|
error = netmap_mem_init();
|
|
if (error != 0)
|
|
goto fail;
|
|
/*
|
|
* MAKEDEV_ETERNAL_KLD avoids an expensive check on syscalls
|
|
* when the module is compiled in.
|
|
* XXX could use make_dev_credv() to get error number
|
|
*/
|
|
netmap_dev = make_dev_credf(MAKEDEV_ETERNAL_KLD,
|
|
&netmap_cdevsw, 0, NULL, UID_ROOT, GID_WHEEL, 0600,
|
|
"netmap");
|
|
if (!netmap_dev)
|
|
goto fail;
|
|
|
|
error = netmap_init_bridges();
|
|
if (error)
|
|
goto fail;
|
|
|
|
#ifdef __FreeBSD__
|
|
nm_os_vi_init_index();
|
|
#endif
|
|
|
|
error = nm_os_ifnet_init();
|
|
if (error)
|
|
goto fail;
|
|
|
|
nm_prinf("netmap: loaded module");
|
|
return (0);
|
|
fail:
|
|
netmap_fini();
|
|
return (EINVAL); /* may be incorrect */
|
|
}
|