256 lines
9.5 KiB
C
256 lines
9.5 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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#ifndef _NET_NETMAP_LEGACY_H_
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#define _NET_NETMAP_LEGACY_H_
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/*
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* $FreeBSD$
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*
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* ioctl names and related fields
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*
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* NIOCTXSYNC, NIOCRXSYNC synchronize tx or rx queues,
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* whose identity is set in NIOCREGIF through nr_ringid.
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* These are non blocking and take no argument.
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*
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* NIOCGINFO takes a struct ifreq, the interface name is the input,
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* the outputs are number of queues and number of descriptor
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* for each queue (useful to set number of threads etc.).
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* The info returned is only advisory and may change before
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* the interface is bound to a file descriptor.
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*
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* NIOCREGIF takes an interface name within a struct nmre,
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* and activates netmap mode on the interface (if possible).
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*
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* The argument to NIOCGINFO/NIOCREGIF overlays struct ifreq so we
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* can pass it down to other NIC-related ioctls.
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*
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* The actual argument (struct nmreq) has a number of options to request
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* different functions.
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* The following are used in NIOCREGIF when nr_cmd == 0:
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*
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* nr_name (in)
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* The name of the port (em0, valeXXX:YYY, etc.)
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* limited to IFNAMSIZ for backward compatibility.
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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_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_ringid (in)
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* Indicates how rings should be bound to the file descriptors.
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* If nr_flags != 0, then the low bits (in NETMAP_RING_MASK)
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* are used to indicate the ring number, and nr_flags specifies
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* the actual rings to bind. NETMAP_NO_TX_POLL is unaffected.
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*
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* NOTE: THE FOLLOWING (nr_flags == 0) IS DEPRECATED:
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* If nr_flags == 0, NETMAP_HW_RING and NETMAP_SW_RING control
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* the binding as follows:
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* 0 (default) binds all physical rings
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* NETMAP_HW_RING | ring number binds a single ring pair
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* NETMAP_SW_RING binds only the host tx/rx rings
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*
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* NETMAP_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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* NETMAP_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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* NOTE: NETMAP_PRIV_MEM IS DEPRECATED, use nr_arg2 instead.
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* NETMAP_PRIV_MEM is set on return for ports that do not use
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* the global memory allocator.
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* This information is not significant and applications
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* should look at the region id in nr_arg2
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*
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* nr_flags is the recommended mode to indicate which rings should
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* be bound to a file descriptor. Values are NR_REG_*
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*
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* nr_arg1 (in) Reserved.
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*
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* nr_arg2 (in/out) 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_arg3 (in/out) number of extra buffers to be allocated.
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*
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*
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*
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* nr_cmd (in) if non-zero indicates a special command:
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* NETMAP_BDG_ATTACH and nr_name = vale*:ifname
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* attaches the NIC to the switch; nr_ringid specifies
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* which rings to use. Used by valectl -a ...
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* nr_arg1 = NETMAP_BDG_HOST also attaches the host port
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* as in valectl -h ...
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*
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* NETMAP_BDG_DETACH and nr_name = vale*:ifname
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* disconnects a previously attached NIC.
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* Used by valectl -d ...
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*
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* NETMAP_BDG_LIST
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* list the configuration of VALE switches.
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*
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* NETMAP_BDG_VNET_HDR
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* Set the virtio-net header length used by the client
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* of a VALE switch port.
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*
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* NETMAP_BDG_NEWIF
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* create a persistent VALE port with name nr_name.
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* Used by valectl -n ...
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*
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* NETMAP_BDG_DELIF
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* delete a persistent VALE port. Used by valectl -d ...
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*
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* nr_arg1, nr_arg2, nr_arg3 (in/out) command specific
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*
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*
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*
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*/
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/*
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* struct nmreq overlays a struct ifreq (just the name)
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*/
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struct nmreq {
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char nr_name[IFNAMSIZ];
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uint32_t nr_version; /* API version */
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uint32_t nr_offset; /* nifp offset in the shared region */
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uint32_t nr_memsize; /* size of the shared region */
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uint32_t nr_tx_slots; /* slots in tx rings */
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uint32_t nr_rx_slots; /* slots in rx rings */
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uint16_t nr_tx_rings; /* number of tx rings */
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uint16_t nr_rx_rings; /* number of rx rings */
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uint16_t nr_ringid; /* ring(s) we care about */
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#define NETMAP_HW_RING 0x4000 /* single NIC ring pair */
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#define NETMAP_SW_RING 0x2000 /* only host ring pair */
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#define NETMAP_RING_MASK 0x0fff /* the ring number */
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#define NETMAP_NO_TX_POLL 0x1000 /* no automatic txsync on poll */
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#define NETMAP_DO_RX_POLL 0x8000 /* DO automatic rxsync on poll */
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uint16_t nr_cmd;
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#define NETMAP_BDG_ATTACH 1 /* attach the NIC */
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#define NETMAP_BDG_DETACH 2 /* detach the NIC */
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#define NETMAP_BDG_REGOPS 3 /* register bridge callbacks */
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#define NETMAP_BDG_LIST 4 /* get bridge's info */
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#define NETMAP_BDG_VNET_HDR 5 /* set the port virtio-net-hdr length */
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#define NETMAP_BDG_NEWIF 6 /* create a virtual port */
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#define NETMAP_BDG_DELIF 7 /* destroy a virtual port */
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#define NETMAP_PT_HOST_CREATE 8 /* create ptnetmap kthreads */
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#define NETMAP_PT_HOST_DELETE 9 /* delete ptnetmap kthreads */
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#define NETMAP_BDG_POLLING_ON 10 /* delete polling kthread */
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#define NETMAP_BDG_POLLING_OFF 11 /* delete polling kthread */
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#define NETMAP_VNET_HDR_GET 12 /* get the port virtio-net-hdr length */
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uint16_t nr_arg1; /* extra arguments */
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#define NETMAP_BDG_HOST 1 /* nr_arg1 value for NETMAP_BDG_ATTACH */
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uint16_t nr_arg2; /* id of the memory allocator */
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uint32_t nr_arg3; /* req. extra buffers in NIOCREGIF */
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uint32_t nr_flags; /* specify NR_REG_* mode and other flags */
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#define NR_REG_MASK 0xf /* to extract NR_REG_* mode from nr_flags */
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/* various modes, extends nr_ringid */
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uint32_t spare2[1];
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};
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#ifdef _WIN32
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/*
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* Windows does not have _IOWR(). _IO(), _IOW() and _IOR() are defined
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* in ws2def.h but not sure if they are in the form we need.
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* We therefore redefine them in a convenient way to use for DeviceIoControl
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* signatures.
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*/
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#undef _IO // ws2def.h
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#define _WIN_NM_IOCTL_TYPE 40000
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#define _IO(_c, _n) CTL_CODE(_WIN_NM_IOCTL_TYPE, ((_n) + 0x800) , \
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METHOD_BUFFERED, FILE_ANY_ACCESS )
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#define _IO_direct(_c, _n) CTL_CODE(_WIN_NM_IOCTL_TYPE, ((_n) + 0x800) , \
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METHOD_OUT_DIRECT, FILE_ANY_ACCESS )
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#define _IOWR(_c, _n, _s) _IO(_c, _n)
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/* We havesome internal sysctl in addition to the externally visible ones */
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#define NETMAP_MMAP _IO_direct('i', 160) // note METHOD_OUT_DIRECT
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#define NETMAP_POLL _IO('i', 162)
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/* and also two setsockopt for sysctl emulation */
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#define NETMAP_SETSOCKOPT _IO('i', 140)
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#define NETMAP_GETSOCKOPT _IO('i', 141)
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/* These linknames are for the Netmap Core Driver */
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#define NETMAP_NT_DEVICE_NAME L"\\Device\\NETMAP"
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#define NETMAP_DOS_DEVICE_NAME L"\\DosDevices\\netmap"
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/* Definition of a structure used to pass a virtual address within an IOCTL */
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typedef struct _MEMORY_ENTRY {
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PVOID pUsermodeVirtualAddress;
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} MEMORY_ENTRY, *PMEMORY_ENTRY;
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typedef struct _POLL_REQUEST_DATA {
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int events;
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int timeout;
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int revents;
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} POLL_REQUEST_DATA;
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#endif /* _WIN32 */
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/*
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* Opaque structure that is passed to an external kernel
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* module via ioctl(fd, NIOCCONFIG, req) for a user-owned
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* bridge port (at this point ephemeral VALE interface).
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*/
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#define NM_IFRDATA_LEN 256
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struct nm_ifreq {
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char nifr_name[IFNAMSIZ];
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char data[NM_IFRDATA_LEN];
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};
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/*
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* FreeBSD uses the size value embedded in the _IOWR to determine
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* how much to copy in/out. So we need it to match the actual
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* data structure we pass. We put some spares in the structure
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* to ease compatibility with other versions
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*/
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#define NIOCGINFO _IOWR('i', 145, struct nmreq) /* return IF info */
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#define NIOCREGIF _IOWR('i', 146, struct nmreq) /* interface register */
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#define NIOCCONFIG _IOWR('i',150, struct nm_ifreq) /* for ext. modules */
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#endif /* _NET_NETMAP_LEGACY_H_ */
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