1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (C) 2011-2014 Matteo Landi, Luigi Rizzo. All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 *
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``S IS''AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 #ifndef _NET_NETMAP_LEGACY_H_
30 #define _NET_NETMAP_LEGACY_H_
31
32 /*
33 * $FreeBSD$
34 *
35 * ioctl names and related fields
36 *
37 * NIOCTXSYNC, NIOCRXSYNC synchronize tx or rx queues,
38 * whose identity is set in NIOCREGIF through nr_ringid.
39 * These are non blocking and take no argument.
40 *
41 * NIOCGINFO takes a struct ifreq, the interface name is the input,
42 * the outputs are number of queues and number of descriptor
43 * for each queue (useful to set number of threads etc.).
44 * The info returned is only advisory and may change before
45 * the interface is bound to a file descriptor.
46 *
47 * NIOCREGIF takes an interface name within a struct nmre,
48 * and activates netmap mode on the interface (if possible).
49 *
50 * The argument to NIOCGINFO/NIOCREGIF overlays struct ifreq so we
51 * can pass it down to other NIC-related ioctls.
52 *
53 * The actual argument (struct nmreq) has a number of options to request
54 * different functions.
55 * The following are used in NIOCREGIF when nr_cmd == 0:
56 *
57 * nr_name (in)
58 * The name of the port (em0, valeXXX:YYY, etc.)
59 * limited to IFNAMSIZ for backward compatibility.
60 *
61 * nr_version (in/out)
62 * Must match NETMAP_API as used in the kernel, error otherwise.
63 * Always returns the desired value on output.
64 *
65 * nr_tx_slots, nr_tx_slots, nr_tx_rings, nr_rx_rings (in/out)
66 * On input, non-zero values may be used to reconfigure the port
67 * according to the requested values, but this is not guaranteed.
68 * On output the actual values in use are reported.
69 *
70 * nr_ringid (in)
71 * Indicates how rings should be bound to the file descriptors.
72 * If nr_flags != 0, then the low bits (in NETMAP_RING_MASK)
73 * are used to indicate the ring number, and nr_flags specifies
74 * the actual rings to bind. NETMAP_NO_TX_POLL is unaffected.
75 *
76 * NOTE: THE FOLLOWING (nr_flags == 0) IS DEPRECATED:
77 * If nr_flags == 0, NETMAP_HW_RING and NETMAP_SW_RING control
78 * the binding as follows:
79 * 0 (default) binds all physical rings
80 * NETMAP_HW_RING | ring number binds a single ring pair
81 * NETMAP_SW_RING binds only the host tx/rx rings
82 *
83 * NETMAP_NO_TX_POLL can be OR-ed to make select()/poll() push
84 * packets on tx rings only if POLLOUT is set.
85 * The default is to push any pending packet.
86 *
87 * NETMAP_DO_RX_POLL can be OR-ed to make select()/poll() release
88 * packets on rx rings also when POLLIN is NOT set.
89 * The default is to touch the rx ring only with POLLIN.
90 * Note that this is the opposite of TX because it
91 * reflects the common usage.
92 *
93 * NOTE: NETMAP_PRIV_MEM IS DEPRECATED, use nr_arg2 instead.
94 * NETMAP_PRIV_MEM is set on return for ports that do not use
95 * the global memory allocator.
96 * This information is not significant and applications
97 * should look at the region id in nr_arg2
98 *
99 * nr_flags is the recommended mode to indicate which rings should
100 * be bound to a file descriptor. Values are NR_REG_*
101 *
102 * nr_arg1 (in) Reserved.
103 *
104 * nr_arg2 (in/out) The identity of the memory region used.
105 * On input, 0 means the system decides autonomously,
106 * other values may try to select a specific region.
107 * On return the actual value is reported.
108 * Region '1' is the global allocator, normally shared
109 * by all interfaces. Other values are private regions.
110 * If two ports the same region zero-copy is possible.
111 *
112 * nr_arg3 (in/out) number of extra buffers to be allocated.
113 *
114 *
115 *
116 * nr_cmd (in) if non-zero indicates a special command:
117 * NETMAP_BDG_ATTACH and nr_name = vale*:ifname
118 * attaches the NIC to the switch; nr_ringid specifies
119 * which rings to use. Used by valectl -a ...
120 * nr_arg1 = NETMAP_BDG_HOST also attaches the host port
121 * as in valectl -h ...
122 *
123 * NETMAP_BDG_DETACH and nr_name = vale*:ifname
124 * disconnects a previously attached NIC.
125 * Used by valectl -d ...
126 *
127 * NETMAP_BDG_LIST
128 * list the configuration of VALE switches.
129 *
130 * NETMAP_BDG_VNET_HDR
131 * Set the virtio-net header length used by the client
132 * of a VALE switch port.
133 *
134 * NETMAP_BDG_NEWIF
135 * create a persistent VALE port with name nr_name.
136 * Used by valectl -n ...
137 *
138 * NETMAP_BDG_DELIF
139 * delete a persistent VALE port. Used by valectl -d ...
140 *
141 * nr_arg1, nr_arg2, nr_arg3 (in/out) command specific
142 *
143 *
144 *
145 */
146
147
148 /*
149 * struct nmreq overlays a struct ifreq (just the name)
150 */
151 struct nmreq {
152 char nr_name[IFNAMSIZ];
153 uint32_t nr_version; /* API version */
154 uint32_t nr_offset; /* nifp offset in the shared region */
155 uint32_t nr_memsize; /* size of the shared region */
156 uint32_t nr_tx_slots; /* slots in tx rings */
157 uint32_t nr_rx_slots; /* slots in rx rings */
158 uint16_t nr_tx_rings; /* number of tx rings */
159 uint16_t nr_rx_rings; /* number of rx rings */
160
161 uint16_t nr_ringid; /* ring(s) we care about */
162 #define NETMAP_HW_RING 0x4000 /* single NIC ring pair */
163 #define NETMAP_SW_RING 0x2000 /* only host ring pair */
164
165 #define NETMAP_RING_MASK 0x0fff /* the ring number */
166
167 #define NETMAP_NO_TX_POLL 0x1000 /* no automatic txsync on poll */
168
169 #define NETMAP_DO_RX_POLL 0x8000 /* DO automatic rxsync on poll */
170
171 uint16_t nr_cmd;
172 #define NETMAP_BDG_ATTACH 1 /* attach the NIC */
173 #define NETMAP_BDG_DETACH 2 /* detach the NIC */
174 #define NETMAP_BDG_REGOPS 3 /* register bridge callbacks */
175 #define NETMAP_BDG_LIST 4 /* get bridge's info */
176 #define NETMAP_BDG_VNET_HDR 5 /* set the port virtio-net-hdr length */
177 #define NETMAP_BDG_NEWIF 6 /* create a virtual port */
178 #define NETMAP_BDG_DELIF 7 /* destroy a virtual port */
179 #define NETMAP_PT_HOST_CREATE 8 /* create ptnetmap kthreads */
180 #define NETMAP_PT_HOST_DELETE 9 /* delete ptnetmap kthreads */
181 #define NETMAP_BDG_POLLING_ON 10 /* delete polling kthread */
182 #define NETMAP_BDG_POLLING_OFF 11 /* delete polling kthread */
183 #define NETMAP_VNET_HDR_GET 12 /* get the port virtio-net-hdr length */
184 uint16_t nr_arg1; /* extra arguments */
185 #define NETMAP_BDG_HOST 1 /* nr_arg1 value for NETMAP_BDG_ATTACH */
186
187 uint16_t nr_arg2; /* id of the memory allocator */
188 uint32_t nr_arg3; /* req. extra buffers in NIOCREGIF */
189 uint32_t nr_flags; /* specify NR_REG_* mode and other flags */
190 #define NR_REG_MASK 0xf /* to extract NR_REG_* mode from nr_flags */
191 /* various modes, extends nr_ringid */
192 uint32_t spare2[1];
193 };
194
195 #ifdef _WIN32
196 /*
197 * Windows does not have _IOWR(). _IO(), _IOW() and _IOR() are defined
198 * in ws2def.h but not sure if they are in the form we need.
199 * We therefore redefine them in a convenient way to use for DeviceIoControl
200 * signatures.
201 */
202 #undef _IO // ws2def.h
203 #define _WIN_NM_IOCTL_TYPE 40000
204 #define _IO(_c, _n) CTL_CODE(_WIN_NM_IOCTL_TYPE, ((_n) + 0x800) , \
205 METHOD_BUFFERED, FILE_ANY_ACCESS )
206 #define _IO_direct(_c, _n) CTL_CODE(_WIN_NM_IOCTL_TYPE, ((_n) + 0x800) , \
207 METHOD_OUT_DIRECT, FILE_ANY_ACCESS )
208
209 #define _IOWR(_c, _n, _s) _IO(_c, _n)
210
211 /* We havesome internal sysctl in addition to the externally visible ones */
212 #define NETMAP_MMAP _IO_direct('i', 160) // note METHOD_OUT_DIRECT
213 #define NETMAP_POLL _IO('i', 162)
214
215 /* and also two setsockopt for sysctl emulation */
216 #define NETMAP_SETSOCKOPT _IO('i', 140)
217 #define NETMAP_GETSOCKOPT _IO('i', 141)
218
219
220 /* These linknames are for the Netmap Core Driver */
221 #define NETMAP_NT_DEVICE_NAME L"\\Device\\NETMAP"
222 #define NETMAP_DOS_DEVICE_NAME L"\\DosDevices\\netmap"
223
224 /* Definition of a structure used to pass a virtual address within an IOCTL */
225 typedef struct _MEMORY_ENTRY {
226 PVOID pUsermodeVirtualAddress;
227 } MEMORY_ENTRY, *PMEMORY_ENTRY;
228
229 typedef struct _POLL_REQUEST_DATA {
230 int events;
231 int timeout;
232 int revents;
233 } POLL_REQUEST_DATA;
234 #endif /* _WIN32 */
235
236 /*
237 * Opaque structure that is passed to an external kernel
238 * module via ioctl(fd, NIOCCONFIG, req) for a user-owned
239 * bridge port (at this point ephemeral VALE interface).
240 */
241 #define NM_IFRDATA_LEN 256
242 struct nm_ifreq {
243 char nifr_name[IFNAMSIZ];
244 char data[NM_IFRDATA_LEN];
245 };
246
247 /*
248 * FreeBSD uses the size value embedded in the _IOWR to determine
249 * how much to copy in/out. So we need it to match the actual
250 * data structure we pass. We put some spares in the structure
251 * to ease compatibility with other versions
252 */
253 #define NIOCGINFO _IOWR('i', 145, struct nmreq) /* return IF info */
254 #define NIOCREGIF _IOWR('i', 146, struct nmreq) /* interface register */
255 #define NIOCCONFIG _IOWR('i',150, struct nm_ifreq) /* for ext. modules */
256
257 #endif /* _NET_NETMAP_LEGACY_H_ */
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