/*-
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (C) 2011-2014 Matteo Landi, Luigi Rizzo. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``S IS''AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef _NET_NETMAP_LEGACY_H_
#define _NET_NETMAP_LEGACY_H_
/*
*
* ioctl names and related fields
*
* NIOCTXSYNC, NIOCRXSYNC synchronize tx or rx queues,
* whose identity is set in NIOCREGIF through nr_ringid.
* These are non blocking and take no argument.
*
* NIOCGINFO takes a struct ifreq, the interface name is the input,
* the outputs are number of queues and number of descriptor
* for each queue (useful to set number of threads etc.).
* The info returned is only advisory and may change before
* the interface is bound to a file descriptor.
*
* NIOCREGIF takes an interface name within a struct nmre,
* and activates netmap mode on the interface (if possible).
*
* The argument to NIOCGINFO/NIOCREGIF overlays struct ifreq so we
* can pass it down to other NIC-related ioctls.
*
* The actual argument (struct nmreq) has a number of options to request
* different functions.
* The following are used in NIOCREGIF when nr_cmd == 0:
*
* nr_name (in)
* The name of the port (em0, valeXXX:YYY, etc.)
* limited to IFNAMSIZ for backward compatibility.
*
* nr_version (in/out)
* Must match NETMAP_API as used in the kernel, error otherwise.
* Always returns the desired value on output.
*
* nr_tx_slots, nr_tx_slots, nr_tx_rings, nr_rx_rings (in/out)
* On input, non-zero values may be used to reconfigure the port
* according to the requested values, but this is not guaranteed.
* On output the actual values in use are reported.
*
* nr_ringid (in)
* Indicates how rings should be bound to the file descriptors.
* If nr_flags != 0, then the low bits (in NETMAP_RING_MASK)
* are used to indicate the ring number, and nr_flags specifies
* the actual rings to bind. NETMAP_NO_TX_POLL is unaffected.
*
* NOTE: THE FOLLOWING (nr_flags == 0) IS DEPRECATED:
* If nr_flags == 0, NETMAP_HW_RING and NETMAP_SW_RING control
* the binding as follows:
* 0 (default) binds all physical rings
* NETMAP_HW_RING | ring number binds a single ring pair
* NETMAP_SW_RING binds only the host tx/rx rings
*
* NETMAP_NO_TX_POLL can be OR-ed to make select()/poll() push
* packets on tx rings only if POLLOUT is set.
* The default is to push any pending packet.
*
* NETMAP_DO_RX_POLL can be OR-ed to make select()/poll() release
* packets on rx rings also when POLLIN is NOT set.
* The default is to touch the rx ring only with POLLIN.
* Note that this is the opposite of TX because it
* reflects the common usage.
*
* NOTE: NETMAP_PRIV_MEM IS DEPRECATED, use nr_arg2 instead.
* NETMAP_PRIV_MEM is set on return for ports that do not use
* the global memory allocator.
* This information is not significant and applications
* should look at the region id in nr_arg2
*
* nr_flags is the recommended mode to indicate which rings should
* be bound to a file descriptor. Values are NR_REG_*
*
* nr_arg1 (in) Reserved.
*
* nr_arg2 (in/out) The identity of the memory region used.
* On input, 0 means the system decides autonomously,
* other values may try to select a specific region.
* On return the actual value is reported.
* Region '1' is the global allocator, normally shared
* by all interfaces. Other values are private regions.
* If two ports the same region zero-copy is possible.
*
* nr_arg3 (in/out) number of extra buffers to be allocated.
*
*
*
* nr_cmd (in) if non-zero indicates a special command:
* NETMAP_BDG_ATTACH and nr_name = vale*:ifname
* attaches the NIC to the switch; nr_ringid specifies
* which rings to use. Used by valectl -a ...
* nr_arg1 = NETMAP_BDG_HOST also attaches the host port
* as in valectl -h ...
*
* NETMAP_BDG_DETACH and nr_name = vale*:ifname
* disconnects a previously attached NIC.
* Used by valectl -d ...
*
* NETMAP_BDG_LIST
* list the configuration of VALE switches.
*
* NETMAP_BDG_VNET_HDR
* Set the virtio-net header length used by the client
* of a VALE switch port.
*
* NETMAP_BDG_NEWIF
* create a persistent VALE port with name nr_name.
* Used by valectl -n ...
*
* NETMAP_BDG_DELIF
* delete a persistent VALE port. Used by valectl -d ...
*
* nr_arg1, nr_arg2, nr_arg3 (in/out) command specific
*
*
*
*/
/*
* struct nmreq overlays a struct ifreq (just the name)
*/
struct nmreq {
char nr_name[IFNAMSIZ];
uint32_t nr_version; /* API version */
uint32_t nr_offset; /* nifp offset in the shared region */
uint32_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_ringid; /* ring(s) we care about */
#define NETMAP_HW_RING 0x4000 /* single NIC ring pair */
#define NETMAP_SW_RING 0x2000 /* only host ring pair */
#define NETMAP_RING_MASK 0x0fff /* the ring number */
#define NETMAP_NO_TX_POLL 0x1000 /* no automatic txsync on poll */
#define NETMAP_DO_RX_POLL 0x8000 /* DO automatic rxsync on poll */
uint16_t nr_cmd;
#define NETMAP_BDG_ATTACH 1 /* attach the NIC */
#define NETMAP_BDG_DETACH 2 /* detach the NIC */
#define NETMAP_BDG_REGOPS 3 /* register bridge callbacks */
#define NETMAP_BDG_LIST 4 /* get bridge's info */
#define NETMAP_BDG_VNET_HDR 5 /* set the port virtio-net-hdr length */
#define NETMAP_BDG_NEWIF 6 /* create a virtual port */
#define NETMAP_BDG_DELIF 7 /* destroy a virtual port */
#define NETMAP_PT_HOST_CREATE 8 /* create ptnetmap kthreads */
#define NETMAP_PT_HOST_DELETE 9 /* delete ptnetmap kthreads */
#define NETMAP_BDG_POLLING_ON 10 /* delete polling kthread */
#define NETMAP_BDG_POLLING_OFF 11 /* delete polling kthread */
#define NETMAP_VNET_HDR_GET 12 /* get the port virtio-net-hdr length */
uint16_t nr_arg1; /* extra arguments */
#define NETMAP_BDG_HOST 1 /* nr_arg1 value for NETMAP_BDG_ATTACH */
uint16_t nr_arg2; /* id of the memory allocator */
uint32_t nr_arg3; /* req. extra buffers in NIOCREGIF */
uint32_t nr_flags; /* specify NR_REG_* mode and other flags */
#define NR_REG_MASK 0xf /* to extract NR_REG_* mode from nr_flags */
/* various modes, extends nr_ringid */
uint32_t spare2[1];
};
#ifdef _WIN32
/*
* Windows does not have _IOWR(). _IO(), _IOW() and _IOR() are defined
* in ws2def.h but not sure if they are in the form we need.
* We therefore redefine them in a convenient way to use for DeviceIoControl
* signatures.
*/
#undef _IO // ws2def.h
#define _WIN_NM_IOCTL_TYPE 40000
#define _IO(_c, _n) CTL_CODE(_WIN_NM_IOCTL_TYPE, ((_n) + 0x800) , \
METHOD_BUFFERED, FILE_ANY_ACCESS )
#define _IO_direct(_c, _n) CTL_CODE(_WIN_NM_IOCTL_TYPE, ((_n) + 0x800) , \
METHOD_OUT_DIRECT, FILE_ANY_ACCESS )
#define _IOWR(_c, _n, _s) _IO(_c, _n)
/* We havesome internal sysctl in addition to the externally visible ones */
#define NETMAP_MMAP _IO_direct('i', 160) // note METHOD_OUT_DIRECT
#define NETMAP_POLL _IO('i', 162)
/* and also two setsockopt for sysctl emulation */
#define NETMAP_SETSOCKOPT _IO('i', 140)
#define NETMAP_GETSOCKOPT _IO('i', 141)
/* These linknames are for the Netmap Core Driver */
#define NETMAP_NT_DEVICE_NAME L"\\Device\\NETMAP"
#define NETMAP_DOS_DEVICE_NAME L"\\DosDevices\\netmap"
/* Definition of a structure used to pass a virtual address within an IOCTL */
typedef struct _MEMORY_ENTRY {
PVOID pUsermodeVirtualAddress;
} MEMORY_ENTRY, *PMEMORY_ENTRY;
typedef struct _POLL_REQUEST_DATA {
int events;
int timeout;
int revents;
} POLL_REQUEST_DATA;
#endif /* _WIN32 */
/*
* Opaque structure that is passed to an external kernel
* module via ioctl(fd, NIOCCONFIG, req) for a user-owned
* bridge port (at this point ephemeral VALE interface).
*/
#define NM_IFRDATA_LEN 256
struct nm_ifreq {
char nifr_name[IFNAMSIZ];
char data[NM_IFRDATA_LEN];
};
/*
* FreeBSD uses the size value embedded in the _IOWR to determine
* how much to copy in/out. So we need it to match the actual
* data structure we pass. We put some spares in the structure
* to ease compatibility with other versions
*/
#define NIOCGINFO _IOWR('i', 145, struct nmreq) /* return IF info */
#define NIOCREGIF _IOWR('i', 146, struct nmreq) /* interface register */
#define NIOCCONFIG _IOWR('i',150, struct nm_ifreq) /* for ext. modules */
#endif /* _NET_NETMAP_LEGACY_H_ */
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