2b47cf4fb9
Add SYNC_KLOOP_MODE option, and add support for direct mode, where application executes the TXSYNC and RXSYNC in the context of the ioeventfd wake up callback. MFC after: 5 days
929 lines
32 KiB
C
929 lines
32 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, Luigi Rizzo. 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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*
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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 ``S 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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* Definitions of constants and the structures used by the netmap
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* framework, for the part visible to both kernel and userspace.
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* Detailed info on netmap is available with "man netmap" or at
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*
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* http://info.iet.unipi.it/~luigi/netmap/
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*
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* This API is also used to communicate with the VALE software switch
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*/
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#ifndef _NET_NETMAP_H_
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#define _NET_NETMAP_H_
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#define NETMAP_API 13 /* current API version */
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#define NETMAP_MIN_API 13 /* min and max versions accepted */
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#define NETMAP_MAX_API 15
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/*
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* Some fields should be cache-aligned to reduce contention.
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* The alignment is architecture and OS dependent, but rather than
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* digging into OS headers to find the exact value we use an estimate
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* that should cover most architectures.
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*/
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#define NM_CACHE_ALIGN 128
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/*
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* --- Netmap data structures ---
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*
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* The userspace data structures used by netmap are shown below.
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* They are allocated by the kernel and mmap()ed by userspace threads.
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* Pointers are implemented as memory offsets or indexes,
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* so that they can be easily dereferenced in kernel and userspace.
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KERNEL (opaque, obviously)
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====================================================================
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USERSPACE | struct netmap_ring
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+---->+---------------+
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/ | head,cur,tail |
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struct netmap_if (nifp, 1 per fd) / | buf_ofs |
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+---------------+ / | other fields |
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| ni_tx_rings | / +===============+
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| ni_rx_rings | / | buf_idx, len | slot[0]
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| | / | flags, ptr |
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| | / +---------------+
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+===============+ / | buf_idx, len | slot[1]
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| txring_ofs[0] | (rel.to nifp)--' | flags, ptr |
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| txring_ofs[1] | +---------------+
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(tx+1 entries) (num_slots entries)
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| txring_ofs[t] | | buf_idx, len | slot[n-1]
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+---------------+ | flags, ptr |
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| rxring_ofs[0] | +---------------+
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| rxring_ofs[1] |
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(rx+1 entries)
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| rxring_ofs[r] |
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+---------------+
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* For each "interface" (NIC, host stack, PIPE, VALE switch port) bound to
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* a file descriptor, the mmap()ed region contains a (logically readonly)
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* struct netmap_if pointing to struct netmap_ring's.
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*
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* There is one netmap_ring per physical NIC ring, plus one tx/rx ring
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* pair attached to the host stack (this pair is unused for non-NIC ports).
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*
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* All physical/host stack ports share the same memory region,
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* so that zero-copy can be implemented between them.
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* VALE switch ports instead have separate memory regions.
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*
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* The netmap_ring is the userspace-visible replica of the NIC ring.
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* Each slot has the index of a buffer (MTU-sized and residing in the
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* mmapped region), its length and some flags. An extra 64-bit pointer
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* is provided for user-supplied buffers in the tx path.
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*
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* In user space, the buffer address is computed as
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* (char *)ring + buf_ofs + index * NETMAP_BUF_SIZE
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*
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* Added in NETMAP_API 11:
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*
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* + NIOCREGIF can request the allocation of extra spare buffers from
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* the same memory pool. The desired number of buffers must be in
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* nr_arg3. The ioctl may return fewer buffers, depending on memory
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* availability. nr_arg3 will return the actual value, and, once
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* mapped, nifp->ni_bufs_head will be the index of the first buffer.
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*
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* The buffers are linked to each other using the first uint32_t
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* as the index. On close, ni_bufs_head must point to the list of
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* buffers to be released.
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*
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* + NIOCREGIF can request space for extra rings (and buffers)
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* allocated in the same memory space. The number of extra rings
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* is in nr_arg1, and is advisory. This is a no-op on NICs where
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* the size of the memory space is fixed.
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*
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* + NIOCREGIF can attach to PIPE rings sharing the same memory
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* space with a parent device. The ifname indicates the parent device,
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* which must already exist. Flags in nr_flags indicate if we want to
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* bind the master or slave side, the index (from nr_ringid)
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* is just a cookie and does not need to be sequential.
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*
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* + NIOCREGIF can also attach to 'monitor' rings that replicate
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* the content of specific rings, also from the same memory space.
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*
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* Extra flags in nr_flags support the above functions.
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* Application libraries may use the following naming scheme:
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* netmap:foo all NIC ring pairs
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* netmap:foo^ only host ring pair
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* netmap:foo+ all NIC ring + host ring pairs
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* netmap:foo-k the k-th NIC ring pair
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* netmap:foo{k PIPE ring pair k, master side
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* netmap:foo}k PIPE ring pair k, slave side
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*
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* Some notes about host rings:
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*
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* + The RX host ring is used to store those packets that the host network
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* stack is trying to transmit through a NIC queue, but only if that queue
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* is currently in netmap mode. Netmap will not intercept host stack mbufs
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* designated to NIC queues that are not in netmap mode. As a consequence,
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* registering a netmap port with netmap:foo^ is not enough to intercept
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* mbufs in the RX host ring; the netmap port should be registered with
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* netmap:foo*, or another registration should be done to open at least a
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* NIC TX queue in netmap mode.
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*
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* + Netmap is not currently able to deal with intercepted trasmit mbufs which
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* require offloadings like TSO, UFO, checksumming offloadings, etc. It is
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* responsibility of the user to disable those offloadings (e.g. using
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* ifconfig on FreeBSD or ethtool -K on Linux) for an interface that is being
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* used in netmap mode. If the offloadings are not disabled, GSO and/or
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* unchecksummed packets may be dropped immediately or end up in the host RX
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* ring, and will be dropped as soon as the packet reaches another netmap
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* adapter.
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*/
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/*
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* struct netmap_slot is a buffer descriptor
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*/
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struct netmap_slot {
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uint32_t buf_idx; /* buffer index */
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uint16_t len; /* length for this slot */
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uint16_t flags; /* buf changed, etc. */
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uint64_t ptr; /* pointer for indirect buffers */
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};
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/*
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* The following flags control how the slot is used
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*/
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#define NS_BUF_CHANGED 0x0001 /* buf_idx changed */
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/*
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* must be set whenever buf_idx is changed (as it might be
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* necessary to recompute the physical address and mapping)
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*
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* It is also set by the kernel whenever the buf_idx is
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* changed internally (e.g., by pipes). Applications may
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* use this information to know when they can reuse the
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* contents of previously prepared buffers.
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*/
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#define NS_REPORT 0x0002 /* ask the hardware to report results */
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/*
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* Request notification when slot is used by the hardware.
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* Normally transmit completions are handled lazily and
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* may be unreported. This flag lets us know when a slot
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* has been sent (e.g. to terminate the sender).
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*/
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#define NS_FORWARD 0x0004 /* pass packet 'forward' */
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/*
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* (Only for physical ports, rx rings with NR_FORWARD set).
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* Slot released to the kernel (i.e. before ring->head) with
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* this flag set are passed to the peer ring (host/NIC),
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* thus restoring the host-NIC connection for these slots.
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* This supports efficient traffic monitoring or firewalling.
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*/
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#define NS_NO_LEARN 0x0008 /* disable bridge learning */
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/*
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* On a VALE switch, do not 'learn' the source port for
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* this buffer.
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*/
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#define NS_INDIRECT 0x0010 /* userspace buffer */
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/*
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* (VALE tx rings only) data is in a userspace buffer,
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* whose address is in the 'ptr' field in the slot.
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*/
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#define NS_MOREFRAG 0x0020 /* packet has more fragments */
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/*
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* (VALE ports, ptnetmap ports and some NIC ports, e.g.
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* ixgbe and i40e on Linux)
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* Set on all but the last slot of a multi-segment packet.
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* The 'len' field refers to the individual fragment.
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*/
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#define NS_PORT_SHIFT 8
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#define NS_PORT_MASK (0xff << NS_PORT_SHIFT)
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/*
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* The high 8 bits of the flag, if not zero, indicate the
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* destination port for the VALE switch, overriding
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* the lookup table.
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*/
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#define NS_RFRAGS(_slot) ( ((_slot)->flags >> 8) & 0xff)
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/*
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* (VALE rx rings only) the high 8 bits
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* are the number of fragments.
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*/
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#define NETMAP_MAX_FRAGS 64 /* max number of fragments */
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/*
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* struct netmap_ring
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*
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* Netmap representation of a TX or RX ring (also known as "queue").
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* This is a queue implemented as a fixed-size circular array.
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* At the software level the important fields are: head, cur, tail.
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*
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* In TX rings:
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*
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* head first slot available for transmission.
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* cur wakeup point. select() and poll() will unblock
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* when 'tail' moves past 'cur'
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* tail (readonly) first slot reserved to the kernel
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*
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* [head .. tail-1] can be used for new packets to send;
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* 'head' and 'cur' must be incremented as slots are filled
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* with new packets to be sent;
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* 'cur' can be moved further ahead if we need more space
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* for new transmissions. XXX todo (2014-03-12)
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*
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* In RX rings:
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*
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* head first valid received packet
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* cur wakeup point. select() and poll() will unblock
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* when 'tail' moves past 'cur'
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* tail (readonly) first slot reserved to the kernel
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*
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* [head .. tail-1] contain received packets;
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* 'head' and 'cur' must be incremented as slots are consumed
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* and can be returned to the kernel;
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* 'cur' can be moved further ahead if we want to wait for
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* new packets without returning the previous ones.
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*
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* DATA OWNERSHIP/LOCKING:
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* The netmap_ring, and all slots and buffers in the range
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* [head .. tail-1] are owned by the user program;
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* the kernel only accesses them during a netmap system call
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* and in the user thread context.
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*
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* Other slots and buffers are reserved for use by the kernel
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*/
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struct netmap_ring {
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/*
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* buf_ofs is meant to be used through macros.
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* It contains the offset of the buffer region from this
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* descriptor.
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*/
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const int64_t buf_ofs;
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const uint32_t num_slots; /* number of slots in the ring. */
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const uint32_t nr_buf_size;
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const uint16_t ringid;
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const uint16_t dir; /* 0: tx, 1: rx */
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uint32_t head; /* (u) first user slot */
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uint32_t cur; /* (u) wakeup point */
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uint32_t tail; /* (k) first kernel slot */
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uint32_t flags;
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struct timeval ts; /* (k) time of last *sync() */
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/* opaque room for a mutex or similar object */
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#if !defined(_WIN32) || defined(__CYGWIN__)
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uint8_t __attribute__((__aligned__(NM_CACHE_ALIGN))) sem[128];
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#else
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uint8_t __declspec(align(NM_CACHE_ALIGN)) sem[128];
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#endif
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/* the slots follow. This struct has variable size */
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struct netmap_slot slot[0]; /* array of slots. */
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};
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/*
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* RING FLAGS
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*/
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#define NR_TIMESTAMP 0x0002 /* set timestamp on *sync() */
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/*
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* updates the 'ts' field on each netmap syscall. This saves
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* saves a separate gettimeofday(), and is not much worse than
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* software timestamps generated in the interrupt handler.
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*/
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#define NR_FORWARD 0x0004 /* enable NS_FORWARD for ring */
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/*
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* Enables the NS_FORWARD slot flag for the ring.
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*/
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/*
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* Helper functions for kernel and userspace
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*/
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/*
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* Check if space is available in the ring. We use ring->head, which
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* points to the next netmap slot to be published to netmap. It is
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* possible that the applications moves ring->cur ahead of ring->tail
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* (e.g., by setting ring->cur <== ring->tail), if it wants more slots
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* than the ones currently available, and it wants to be notified when
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* more arrive. See netmap(4) for more details and examples.
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*/
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static inline int
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nm_ring_empty(struct netmap_ring *ring)
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{
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return (ring->head == ring->tail);
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}
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/*
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* Netmap representation of an interface and its queue(s).
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* This is initialized by the kernel when binding a file
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* descriptor to a port, and should be considered as readonly
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* by user programs. The kernel never uses it.
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*
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* There is one netmap_if for each file descriptor on which we want
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* to select/poll.
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* select/poll operates on one or all pairs depending on the value of
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* nmr_queueid passed on the ioctl.
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*/
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struct netmap_if {
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char ni_name[IFNAMSIZ]; /* name of the interface. */
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const uint32_t ni_version; /* API version, currently unused */
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const uint32_t ni_flags; /* properties */
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#define NI_PRIV_MEM 0x1 /* private memory region */
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/*
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* The number of packet rings available in netmap mode.
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* Physical NICs can have different numbers of tx and rx rings.
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* Physical NICs also have a 'host' ring pair.
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* Additionally, clients can request additional ring pairs to
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* be used for internal communication.
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*/
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const uint32_t ni_tx_rings; /* number of HW tx rings */
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const uint32_t ni_rx_rings; /* number of HW rx rings */
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uint32_t ni_bufs_head; /* head index for extra bufs */
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uint32_t ni_spare1[5];
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/*
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* The following array contains the offset of each netmap ring
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* from this structure, in the following order:
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* NIC tx rings (ni_tx_rings); host tx ring (1); extra tx rings;
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* NIC rx rings (ni_rx_rings); host tx ring (1); extra rx rings.
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*
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* The area is filled up by the kernel on NIOCREGIF,
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* and then only read by userspace code.
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*/
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const ssize_t ring_ofs[0];
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};
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/* Legacy interface to interact with a netmap control device.
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* Included for backward compatibility. The user should not include this
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* file directly. */
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#include "netmap_legacy.h"
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/*
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* New API to control netmap control devices. New applications should only use
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* nmreq_xyz structs with the NIOCCTRL ioctl() command.
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*
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* NIOCCTRL takes a nmreq_header struct, which contains the required
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* API version, the name of a netmap port, a command type, and pointers
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* to request body and options.
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*
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* nr_name (in)
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* The name of the port (em0, valeXXX:YYY, eth0{pn1 etc.)
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*
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* nr_version (in/out)
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* Must match NETMAP_API as used in the kernel, error otherwise.
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* Always returns the desired value on output.
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*
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* nr_reqtype (in)
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* One of the NETMAP_REQ_* command types below
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*
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* nr_body (in)
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* Pointer to a command-specific struct, described by one
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* of the struct nmreq_xyz below.
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*
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* nr_options (in)
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* Command specific options, if any.
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*
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* A NETMAP_REQ_REGISTER command activates netmap mode on the netmap
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* port (e.g. physical interface) specified by nmreq_header.nr_name.
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* The request body (struct nmreq_register) has several arguments to
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* specify how the port is to be registered.
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*
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* nr_tx_slots, nr_tx_slots, nr_tx_rings, nr_rx_rings (in/out)
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* On input, non-zero values may be used to reconfigure the port
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* according to the requested values, but this is not guaranteed.
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* On output the actual values in use are reported.
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*
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* nr_mode (in)
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* Indicate what set of rings must be bound to the netmap
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* device (e.g. all NIC rings, host rings only, NIC and
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* host rings, ...). Values are in NR_REG_*.
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*
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* nr_ringid (in)
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* If nr_mode == NR_REG_ONE_NIC (only a single couple of TX/RX
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* rings), indicate which NIC TX and/or RX ring is to be bound
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* (0..nr_*x_rings-1).
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*
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* nr_flags (in)
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* Indicate special options for how to open the port.
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*
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* NR_NO_TX_POLL can be OR-ed to make select()/poll() push
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* packets on tx rings only if POLLOUT is set.
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* The default is to push any pending packet.
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*
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* NR_DO_RX_POLL can be OR-ed to make select()/poll() release
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* packets on rx rings also when POLLIN is NOT set.
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* The default is to touch the rx ring only with POLLIN.
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* Note that this is the opposite of TX because it
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* reflects the common usage.
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*
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* Other options are NR_MONITOR_TX, NR_MONITOR_RX, NR_ZCOPY_MON,
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* NR_EXCLUSIVE, NR_RX_RINGS_ONLY, NR_TX_RINGS_ONLY and
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* NR_ACCEPT_VNET_HDR.
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*
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* nr_mem_id (in/out)
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* The identity of the memory region used.
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* On input, 0 means the system decides autonomously,
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* other values may try to select a specific region.
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* On return the actual value is reported.
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* Region '1' is the global allocator, normally shared
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* by all interfaces. Other values are private regions.
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* If two ports the same region zero-copy is possible.
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*
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* nr_extra_bufs (in/out)
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* Number of extra buffers to be allocated.
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*
|
|
* The other NETMAP_REQ_* commands are described below.
|
|
*
|
|
*/
|
|
|
|
/* maximum size of a request, including all options */
|
|
#define NETMAP_REQ_MAXSIZE 4096
|
|
|
|
/* Header common to all request options. */
|
|
struct nmreq_option {
|
|
/* Pointer ot the next option. */
|
|
uint64_t nro_next;
|
|
/* Option type. */
|
|
uint32_t nro_reqtype;
|
|
/* (out) status of the option:
|
|
* 0: recognized and processed
|
|
* !=0: errno value
|
|
*/
|
|
uint32_t nro_status;
|
|
/* Option size, used only for options that can have variable size
|
|
* (e.g. because they contain arrays). For fixed-size options this
|
|
* field should be set to zero. */
|
|
uint64_t nro_size;
|
|
};
|
|
|
|
/* Header common to all requests. Do not reorder these fields, as we need
|
|
* the second one (nr_reqtype) to know how much to copy from/to userspace. */
|
|
struct nmreq_header {
|
|
uint16_t nr_version; /* API version */
|
|
uint16_t nr_reqtype; /* nmreq type (NETMAP_REQ_*) */
|
|
uint32_t nr_reserved; /* must be zero */
|
|
#define NETMAP_REQ_IFNAMSIZ 64
|
|
char nr_name[NETMAP_REQ_IFNAMSIZ]; /* port name */
|
|
uint64_t nr_options; /* command-specific options */
|
|
uint64_t nr_body; /* ptr to nmreq_xyz struct */
|
|
};
|
|
|
|
enum {
|
|
/* Register a netmap port with the device. */
|
|
NETMAP_REQ_REGISTER = 1,
|
|
/* Get information from a netmap port. */
|
|
NETMAP_REQ_PORT_INFO_GET,
|
|
/* Attach a netmap port to a VALE switch. */
|
|
NETMAP_REQ_VALE_ATTACH,
|
|
/* Detach a netmap port from a VALE switch. */
|
|
NETMAP_REQ_VALE_DETACH,
|
|
/* List the ports attached to a VALE switch. */
|
|
NETMAP_REQ_VALE_LIST,
|
|
/* Set the port header length (was virtio-net header length). */
|
|
NETMAP_REQ_PORT_HDR_SET,
|
|
/* Get the port header length (was virtio-net header length). */
|
|
NETMAP_REQ_PORT_HDR_GET,
|
|
/* Create a new persistent VALE port. */
|
|
NETMAP_REQ_VALE_NEWIF,
|
|
/* Delete a persistent VALE port. */
|
|
NETMAP_REQ_VALE_DELIF,
|
|
/* Enable polling kernel thread(s) on an attached VALE port. */
|
|
NETMAP_REQ_VALE_POLLING_ENABLE,
|
|
/* Disable polling kernel thread(s) on an attached VALE port. */
|
|
NETMAP_REQ_VALE_POLLING_DISABLE,
|
|
/* Get info about the pools of a memory allocator. */
|
|
NETMAP_REQ_POOLS_INFO_GET,
|
|
/* Start an in-kernel loop that syncs the rings periodically or
|
|
* on notifications. The loop runs in the context of the ioctl
|
|
* syscall, and only stops on NETMAP_REQ_SYNC_KLOOP_STOP. */
|
|
NETMAP_REQ_SYNC_KLOOP_START,
|
|
/* Stops the thread executing the in-kernel loop. The thread
|
|
* returns from the ioctl syscall. */
|
|
NETMAP_REQ_SYNC_KLOOP_STOP,
|
|
/* Enable CSB mode on a registered netmap control device. */
|
|
NETMAP_REQ_CSB_ENABLE,
|
|
};
|
|
|
|
enum {
|
|
/* On NETMAP_REQ_REGISTER, ask netmap to use memory allocated
|
|
* from user-space allocated memory pools (e.g. hugepages).
|
|
*/
|
|
NETMAP_REQ_OPT_EXTMEM = 1,
|
|
|
|
/* ON NETMAP_REQ_SYNC_KLOOP_START, ask netmap to use eventfd-based
|
|
* notifications to synchronize the kernel loop with the application.
|
|
*/
|
|
NETMAP_REQ_OPT_SYNC_KLOOP_EVENTFDS,
|
|
|
|
/* On NETMAP_REQ_REGISTER, ask netmap to work in CSB mode, where
|
|
* head, cur and tail pointers are not exchanged through the
|
|
* struct netmap_ring header, but rather using an user-provided
|
|
* memory area (see struct nm_csb_atok and struct nm_csb_ktoa).
|
|
*/
|
|
NETMAP_REQ_OPT_CSB,
|
|
|
|
/* An extension to NETMAP_REQ_OPT_SYNC_KLOOP_EVENTFDS, which specifies
|
|
* if the TX and/or RX rings are synced in the context of the VM exit.
|
|
* This requires the 'ioeventfd' fields to be valid (cannot be < 0).
|
|
*/
|
|
NETMAP_REQ_OPT_SYNC_KLOOP_MODE,
|
|
};
|
|
|
|
/*
|
|
* nr_reqtype: NETMAP_REQ_REGISTER
|
|
* Bind (register) a netmap port to this control device.
|
|
*/
|
|
struct nmreq_register {
|
|
uint64_t nr_offset; /* nifp offset in the shared region */
|
|
uint64_t nr_memsize; /* size of the shared region */
|
|
uint32_t nr_tx_slots; /* slots in tx rings */
|
|
uint32_t nr_rx_slots; /* slots in rx rings */
|
|
uint16_t nr_tx_rings; /* number of tx rings */
|
|
uint16_t nr_rx_rings; /* number of rx rings */
|
|
|
|
uint16_t nr_mem_id; /* id of the memory allocator */
|
|
uint16_t nr_ringid; /* ring(s) we care about */
|
|
uint32_t nr_mode; /* specify NR_REG_* modes */
|
|
uint32_t nr_extra_bufs; /* number of requested extra buffers */
|
|
|
|
uint64_t nr_flags; /* additional flags (see below) */
|
|
/* monitors use nr_ringid and nr_mode to select the rings to monitor */
|
|
#define NR_MONITOR_TX 0x100
|
|
#define NR_MONITOR_RX 0x200
|
|
#define NR_ZCOPY_MON 0x400
|
|
/* request exclusive access to the selected rings */
|
|
#define NR_EXCLUSIVE 0x800
|
|
/* 0x1000 unused */
|
|
#define NR_RX_RINGS_ONLY 0x2000
|
|
#define NR_TX_RINGS_ONLY 0x4000
|
|
/* Applications set this flag if they are able to deal with virtio-net headers,
|
|
* that is send/receive frames that start with a virtio-net header.
|
|
* If not set, NIOCREGIF will fail with netmap ports that require applications
|
|
* to use those headers. If the flag is set, the application can use the
|
|
* NETMAP_VNET_HDR_GET command to figure out the header length. */
|
|
#define NR_ACCEPT_VNET_HDR 0x8000
|
|
/* The following two have the same meaning of NETMAP_NO_TX_POLL and
|
|
* NETMAP_DO_RX_POLL. */
|
|
#define NR_DO_RX_POLL 0x10000
|
|
#define NR_NO_TX_POLL 0x20000
|
|
};
|
|
|
|
/* Valid values for nmreq_register.nr_mode (see above). */
|
|
enum { NR_REG_DEFAULT = 0, /* backward compat, should not be used. */
|
|
NR_REG_ALL_NIC = 1,
|
|
NR_REG_SW = 2,
|
|
NR_REG_NIC_SW = 3,
|
|
NR_REG_ONE_NIC = 4,
|
|
NR_REG_PIPE_MASTER = 5, /* deprecated, use "x{y" port name syntax */
|
|
NR_REG_PIPE_SLAVE = 6, /* deprecated, use "x}y" port name syntax */
|
|
NR_REG_NULL = 7,
|
|
};
|
|
|
|
/* A single ioctl number is shared by all the new API command.
|
|
* Demultiplexing is done using the hdr.nr_reqtype field.
|
|
* FreeBSD uses the size value embedded in the _IOWR to determine
|
|
* how much to copy in/out, so we define the ioctl() command
|
|
* specifying only nmreq_header, and copyin/copyout the rest. */
|
|
#define NIOCCTRL _IOWR('i', 151, struct nmreq_header)
|
|
|
|
/* The ioctl commands to sync TX/RX netmap rings.
|
|
* NIOCTXSYNC, NIOCRXSYNC synchronize tx or rx queues,
|
|
* whose identity is set in NIOCREGIF through nr_ringid.
|
|
* These are non blocking and take no argument. */
|
|
#define NIOCTXSYNC _IO('i', 148) /* sync tx queues */
|
|
#define NIOCRXSYNC _IO('i', 149) /* sync rx queues */
|
|
|
|
/*
|
|
* nr_reqtype: NETMAP_REQ_PORT_INFO_GET
|
|
* Get information about a netmap port, including number of rings.
|
|
* slots per ring, id of the memory allocator, etc. The netmap
|
|
* control device used for this operation does not need to be bound
|
|
* to a netmap port.
|
|
*/
|
|
struct nmreq_port_info_get {
|
|
uint64_t nr_memsize; /* size of the shared region */
|
|
uint32_t nr_tx_slots; /* slots in tx rings */
|
|
uint32_t nr_rx_slots; /* slots in rx rings */
|
|
uint16_t nr_tx_rings; /* number of tx rings */
|
|
uint16_t nr_rx_rings; /* number of rx rings */
|
|
uint16_t nr_mem_id; /* memory allocator id (in/out) */
|
|
uint16_t pad1;
|
|
};
|
|
|
|
#define NM_BDG_NAME "vale" /* prefix for bridge port name */
|
|
|
|
/*
|
|
* nr_reqtype: NETMAP_REQ_VALE_ATTACH
|
|
* Attach a netmap port to a VALE switch. Both the name of the netmap
|
|
* port and the VALE switch are specified through the nr_name argument.
|
|
* The attach operation could need to register a port, so at least
|
|
* the same arguments are available.
|
|
* port_index will contain the index where the port has been attached.
|
|
*/
|
|
struct nmreq_vale_attach {
|
|
struct nmreq_register reg;
|
|
uint32_t port_index;
|
|
uint32_t pad1;
|
|
};
|
|
|
|
/*
|
|
* nr_reqtype: NETMAP_REQ_VALE_DETACH
|
|
* Detach a netmap port from a VALE switch. Both the name of the netmap
|
|
* port and the VALE switch are specified through the nr_name argument.
|
|
* port_index will contain the index where the port was attached.
|
|
*/
|
|
struct nmreq_vale_detach {
|
|
uint32_t port_index;
|
|
uint32_t pad1;
|
|
};
|
|
|
|
/*
|
|
* nr_reqtype: NETMAP_REQ_VALE_LIST
|
|
* List the ports of a VALE switch.
|
|
*/
|
|
struct nmreq_vale_list {
|
|
/* Name of the VALE port (valeXXX:YYY) or empty. */
|
|
uint16_t nr_bridge_idx;
|
|
uint16_t pad1;
|
|
uint32_t nr_port_idx;
|
|
};
|
|
|
|
/*
|
|
* nr_reqtype: NETMAP_REQ_PORT_HDR_SET or NETMAP_REQ_PORT_HDR_GET
|
|
* Set or get the port header length of the port identified by hdr.nr_name.
|
|
* The control device does not need to be bound to a netmap port.
|
|
*/
|
|
struct nmreq_port_hdr {
|
|
uint32_t nr_hdr_len;
|
|
uint32_t pad1;
|
|
};
|
|
|
|
/*
|
|
* nr_reqtype: NETMAP_REQ_VALE_NEWIF
|
|
* Create a new persistent VALE port.
|
|
*/
|
|
struct nmreq_vale_newif {
|
|
uint32_t nr_tx_slots; /* slots in tx rings */
|
|
uint32_t nr_rx_slots; /* slots in rx rings */
|
|
uint16_t nr_tx_rings; /* number of tx rings */
|
|
uint16_t nr_rx_rings; /* number of rx rings */
|
|
uint16_t nr_mem_id; /* id of the memory allocator */
|
|
uint16_t pad1;
|
|
};
|
|
|
|
/*
|
|
* nr_reqtype: NETMAP_REQ_VALE_POLLING_ENABLE or NETMAP_REQ_VALE_POLLING_DISABLE
|
|
* Enable or disable polling kthreads on a VALE port.
|
|
*/
|
|
struct nmreq_vale_polling {
|
|
uint32_t nr_mode;
|
|
#define NETMAP_POLLING_MODE_SINGLE_CPU 1
|
|
#define NETMAP_POLLING_MODE_MULTI_CPU 2
|
|
uint32_t nr_first_cpu_id;
|
|
uint32_t nr_num_polling_cpus;
|
|
uint32_t pad1;
|
|
};
|
|
|
|
/*
|
|
* nr_reqtype: NETMAP_REQ_POOLS_INFO_GET
|
|
* Get info about the pools of the memory allocator of the netmap
|
|
* port specified by hdr.nr_name and nr_mem_id. The netmap control
|
|
* device used for this operation does not need to be bound to a netmap
|
|
* port.
|
|
*/
|
|
struct nmreq_pools_info {
|
|
uint64_t nr_memsize;
|
|
uint16_t nr_mem_id; /* in/out argument */
|
|
uint16_t pad1[3];
|
|
uint64_t nr_if_pool_offset;
|
|
uint32_t nr_if_pool_objtotal;
|
|
uint32_t nr_if_pool_objsize;
|
|
uint64_t nr_ring_pool_offset;
|
|
uint32_t nr_ring_pool_objtotal;
|
|
uint32_t nr_ring_pool_objsize;
|
|
uint64_t nr_buf_pool_offset;
|
|
uint32_t nr_buf_pool_objtotal;
|
|
uint32_t nr_buf_pool_objsize;
|
|
};
|
|
|
|
/*
|
|
* nr_reqtype: NETMAP_REQ_SYNC_KLOOP_START
|
|
* Start an in-kernel loop that syncs the rings periodically or on
|
|
* notifications. The loop runs in the context of the ioctl syscall,
|
|
* and only stops on NETMAP_REQ_SYNC_KLOOP_STOP.
|
|
* The registered netmap port must be open in CSB mode.
|
|
*/
|
|
struct nmreq_sync_kloop_start {
|
|
/* Sleeping is the default synchronization method for the kloop.
|
|
* The 'sleep_us' field specifies how many microsconds to sleep for
|
|
* when there is no work to do, before doing another kloop iteration.
|
|
*/
|
|
uint32_t sleep_us;
|
|
uint32_t pad1;
|
|
};
|
|
|
|
/* A CSB entry for the application --> kernel direction. */
|
|
struct nm_csb_atok {
|
|
uint32_t head; /* AW+ KR+ the head of the appl netmap_ring */
|
|
uint32_t cur; /* AW+ KR+ the cur of the appl netmap_ring */
|
|
uint32_t appl_need_kick; /* AW+ KR+ kern --> appl notification enable */
|
|
uint32_t sync_flags; /* AW+ KR+ the flags of the appl [tx|rx]sync() */
|
|
uint32_t pad[12]; /* pad to a 64 bytes cacheline */
|
|
};
|
|
|
|
/* A CSB entry for the application <-- kernel direction. */
|
|
struct nm_csb_ktoa {
|
|
uint32_t hwcur; /* AR+ KW+ the hwcur of the kern netmap_kring */
|
|
uint32_t hwtail; /* AR+ KW+ the hwtail of the kern netmap_kring */
|
|
uint32_t kern_need_kick; /* AR+ KW+ appl-->kern notification enable */
|
|
uint32_t pad[13];
|
|
};
|
|
|
|
#ifdef __linux__
|
|
|
|
#ifdef __KERNEL__
|
|
#define nm_stst_barrier smp_wmb
|
|
#define nm_ldld_barrier smp_rmb
|
|
#define nm_stld_barrier smp_mb
|
|
#else /* !__KERNEL__ */
|
|
static inline void nm_stst_barrier(void)
|
|
{
|
|
/* A memory barrier with release semantic has the combined
|
|
* effect of a store-store barrier and a load-store barrier,
|
|
* which is fine for us. */
|
|
__atomic_thread_fence(__ATOMIC_RELEASE);
|
|
}
|
|
static inline void nm_ldld_barrier(void)
|
|
{
|
|
/* A memory barrier with acquire semantic has the combined
|
|
* effect of a load-load barrier and a store-load barrier,
|
|
* which is fine for us. */
|
|
__atomic_thread_fence(__ATOMIC_ACQUIRE);
|
|
}
|
|
#endif /* !__KERNEL__ */
|
|
|
|
#elif defined(__FreeBSD__)
|
|
|
|
#ifdef _KERNEL
|
|
#define nm_stst_barrier atomic_thread_fence_rel
|
|
#define nm_ldld_barrier atomic_thread_fence_acq
|
|
#define nm_stld_barrier atomic_thread_fence_seq_cst
|
|
#else /* !_KERNEL */
|
|
#include <stdatomic.h>
|
|
static inline void nm_stst_barrier(void)
|
|
{
|
|
atomic_thread_fence(memory_order_release);
|
|
}
|
|
static inline void nm_ldld_barrier(void)
|
|
{
|
|
atomic_thread_fence(memory_order_acquire);
|
|
}
|
|
#endif /* !_KERNEL */
|
|
|
|
#else /* !__linux__ && !__FreeBSD__ */
|
|
#error "OS not supported"
|
|
#endif /* !__linux__ && !__FreeBSD__ */
|
|
|
|
/* Application side of sync-kloop: Write ring pointers (cur, head) to the CSB.
|
|
* This routine is coupled with sync_kloop_kernel_read(). */
|
|
static inline void
|
|
nm_sync_kloop_appl_write(struct nm_csb_atok *atok, uint32_t cur,
|
|
uint32_t head)
|
|
{
|
|
/* Issue a first store-store barrier to make sure writes to the
|
|
* netmap ring do not overcome updates on atok->cur and atok->head. */
|
|
nm_stst_barrier();
|
|
|
|
/*
|
|
* We need to write cur and head to the CSB but we cannot do it atomically.
|
|
* There is no way we can prevent the host from reading the updated value
|
|
* of one of the two and the old value of the other. However, if we make
|
|
* sure that the host never reads a value of head more recent than the
|
|
* value of cur we are safe. We can allow the host to read a value of cur
|
|
* more recent than the value of head, since in the netmap ring cur can be
|
|
* ahead of head and cur cannot wrap around head because it must be behind
|
|
* tail. Inverting the order of writes below could instead result into the
|
|
* host to think head went ahead of cur, which would cause the sync
|
|
* prologue to fail.
|
|
*
|
|
* The following memory barrier scheme is used to make this happen:
|
|
*
|
|
* Guest Host
|
|
*
|
|
* STORE(cur) LOAD(head)
|
|
* wmb() <-----------> rmb()
|
|
* STORE(head) LOAD(cur)
|
|
*
|
|
*/
|
|
atok->cur = cur;
|
|
nm_stst_barrier();
|
|
atok->head = head;
|
|
}
|
|
|
|
/* Application side of sync-kloop: Read kring pointers (hwcur, hwtail) from
|
|
* the CSB. This routine is coupled with sync_kloop_kernel_write(). */
|
|
static inline void
|
|
nm_sync_kloop_appl_read(struct nm_csb_ktoa *ktoa, uint32_t *hwtail,
|
|
uint32_t *hwcur)
|
|
{
|
|
/*
|
|
* We place a memory barrier to make sure that the update of hwtail never
|
|
* overtakes the update of hwcur.
|
|
* (see explanation in sync_kloop_kernel_write).
|
|
*/
|
|
*hwtail = ktoa->hwtail;
|
|
nm_ldld_barrier();
|
|
*hwcur = ktoa->hwcur;
|
|
|
|
/* Make sure that loads from ktoa->hwtail and ktoa->hwcur are not delayed
|
|
* after the loads from the netmap ring. */
|
|
nm_ldld_barrier();
|
|
}
|
|
|
|
/*
|
|
* data for NETMAP_REQ_OPT_* options
|
|
*/
|
|
|
|
struct nmreq_opt_sync_kloop_eventfds {
|
|
struct nmreq_option nro_opt; /* common header */
|
|
/* An array of N entries for bidirectional notifications between
|
|
* the kernel loop and the application. The number of entries and
|
|
* their order must agree with the CSB arrays passed in the
|
|
* NETMAP_REQ_OPT_CSB option. Each entry contains a file descriptor
|
|
* backed by an eventfd.
|
|
*
|
|
* If any of the 'ioeventfd' entries is < 0, the event loop uses
|
|
* the sleeping synchronization strategy (according to sleep_us),
|
|
* and keeps kern_need_kick always disabled.
|
|
* Each 'irqfd' can be < 0, and in that case the corresponding queue
|
|
* is never notified.
|
|
*/
|
|
struct {
|
|
/* Notifier for the application --> kernel loop direction. */
|
|
int32_t ioeventfd;
|
|
/* Notifier for the kernel loop --> application direction. */
|
|
int32_t irqfd;
|
|
} eventfds[0];
|
|
};
|
|
|
|
struct nmreq_opt_sync_kloop_mode {
|
|
struct nmreq_option nro_opt; /* common header */
|
|
#define NM_OPT_SYNC_KLOOP_DIRECT_TX (1 << 0)
|
|
#define NM_OPT_SYNC_KLOOP_DIRECT_RX (1 << 1)
|
|
uint32_t mode;
|
|
};
|
|
|
|
struct nmreq_opt_extmem {
|
|
struct nmreq_option nro_opt; /* common header */
|
|
uint64_t nro_usrptr; /* (in) ptr to usr memory */
|
|
struct nmreq_pools_info nro_info; /* (in/out) */
|
|
};
|
|
|
|
struct nmreq_opt_csb {
|
|
struct nmreq_option nro_opt;
|
|
|
|
/* Array of CSB entries for application --> kernel communication
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* (N entries). */
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uint64_t csb_atok;
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/* Array of CSB entries for kernel --> application communication
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* (N entries). */
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uint64_t csb_ktoa;
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};
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#endif /* _NET_NETMAP_H_ */
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