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Vector Packet Processing
net_netmap.h
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1 /*
2  * Copyright (C) 2011-2014 Matteo Landi, Luigi Rizzo. All rights reserved.
3  *
4  * Redistribution and use in source and binary forms, with or without
5  * modification, are permitted provided that the following conditions
6  * are met:
7  *
8  * 1. Redistributions of source code must retain the above copyright
9  * notice, this list of conditions and the following disclaimer.
10  * 2. Redistributions in binary form must reproduce the above copyright
11  * notice, this list of conditions and the following disclaimer in the
12  * documentation and/or other materials provided with the distribution.
13  *
14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``S IS''AND
15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17  * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24  * SUCH DAMAGE.
25  */
26 
27 /*
28  * $FreeBSD: head/sys/net/netmap.h 251139 2013-05-30 14:07:14Z luigi $
29  *
30  * Definitions of constants and the structures used by the netmap
31  * framework, for the part visible to both kernel and userspace.
32  * Detailed info on netmap is available with "man netmap" or at
33  *
34  * http://info.iet.unipi.it/~luigi/netmap/
35  *
36  * This API is also used to communicate with the VALE software switch
37  */
38 
39 #ifndef _NET_NETMAP_H_
40 #define _NET_NETMAP_H_
41 
42 #define NETMAP_API 11 /* current API version */
43 
44 #define NETMAP_MIN_API 11 /* min and max versions accepted */
45 #define NETMAP_MAX_API 15
46 /*
47  * Some fields should be cache-aligned to reduce contention.
48  * The alignment is architecture and OS dependent, but rather than
49  * digging into OS headers to find the exact value we use an estimate
50  * that should cover most architectures.
51  */
52 #define NM_CACHE_ALIGN 128
53 
54 /*
55  * --- Netmap data structures ---
56  *
57  * The userspace data structures used by netmap are shown below.
58  * They are allocated by the kernel and mmap()ed by userspace threads.
59  * Pointers are implemented as memory offsets or indexes,
60  * so that they can be easily dereferenced in kernel and userspace.
61 
62  KERNEL (opaque, obviously)
63 
64  ====================================================================
65  |
66  USERSPACE | struct netmap_ring
67  +---->+---------------+
68  / | head,cur,tail |
69  struct netmap_if (nifp, 1 per fd) / | buf_ofs |
70  +---------------+ / | other fields |
71  | ni_tx_rings | / +===============+
72  | ni_rx_rings | / | buf_idx, len | slot[0]
73  | | / | flags, ptr |
74  | | / +---------------+
75  +===============+ / | buf_idx, len | slot[1]
76  | txring_ofs[0] | (rel.to nifp)--' | flags, ptr |
77  | txring_ofs[1] | +---------------+
78  (tx+1 entries) (num_slots entries)
79  | txring_ofs[t] | | buf_idx, len | slot[n-1]
80  +---------------+ | flags, ptr |
81  | rxring_ofs[0] | +---------------+
82  | rxring_ofs[1] |
83  (rx+1 entries)
84  | rxring_ofs[r] |
85  +---------------+
86 
87  * For each "interface" (NIC, host stack, PIPE, VALE switch port) bound to
88  * a file descriptor, the mmap()ed region contains a (logically readonly)
89  * struct netmap_if pointing to struct netmap_ring's.
90  *
91  * There is one netmap_ring per physical NIC ring, plus one tx/rx ring
92  * pair attached to the host stack (this pair is unused for non-NIC ports).
93  *
94  * All physical/host stack ports share the same memory region,
95  * so that zero-copy can be implemented between them.
96  * VALE switch ports instead have separate memory regions.
97  *
98  * The netmap_ring is the userspace-visible replica of the NIC ring.
99  * Each slot has the index of a buffer (MTU-sized and residing in the
100  * mmapped region), its length and some flags. An extra 64-bit pointer
101  * is provided for user-supplied buffers in the tx path.
102  *
103  * In user space, the buffer address is computed as
104  * (char *)ring + buf_ofs + index * NETMAP_BUF_SIZE
105  *
106  * Added in NETMAP_API 11:
107  *
108  * + NIOCREGIF can request the allocation of extra spare buffers from
109  * the same memory pool. The desired number of buffers must be in
110  * nr_arg3. The ioctl may return fewer buffers, depending on memory
111  * availability. nr_arg3 will return the actual value, and, once
112  * mapped, nifp->ni_bufs_head will be the index of the first buffer.
113  *
114  * The buffers are linked to each other using the first uint32_t
115  * as the index. On close, ni_bufs_head must point to the list of
116  * buffers to be released.
117  *
118  * + NIOCREGIF can request space for extra rings (and buffers)
119  * allocated in the same memory space. The number of extra rings
120  * is in nr_arg1, and is advisory. This is a no-op on NICs where
121  * the size of the memory space is fixed.
122  *
123  * + NIOCREGIF can attach to PIPE rings sharing the same memory
124  * space with a parent device. The ifname indicates the parent device,
125  * which must already exist. Flags in nr_flags indicate if we want to
126  * bind the master or slave side, the index (from nr_ringid)
127  * is just a cookie and does not need to be sequential.
128  *
129  * + NIOCREGIF can also attach to 'monitor' rings that replicate
130  * the content of specific rings, also from the same memory space.
131  *
132  * Extra flags in nr_flags support the above functions.
133  * Application libraries may use the following naming scheme:
134  * netmap:foo all NIC ring pairs
135  * netmap:foo^ only host ring pair
136  * netmap:foo+ all NIC ring + host ring pairs
137  * netmap:foo-k the k-th NIC ring pair
138  * netmap:foo{k PIPE ring pair k, master side
139  * netmap:foo}k PIPE ring pair k, slave side
140  */
141 
142 /*
143  * struct netmap_slot is a buffer descriptor
144  */
145 struct netmap_slot {
146  uint32_t buf_idx; /* buffer index */
147  uint16_t len; /* length for this slot */
148  uint16_t flags; /* buf changed, etc. */
149  uint64_t ptr; /* pointer for indirect buffers */
150 };
151 
152 /*
153  * The following flags control how the slot is used
154  */
155 
156 #define NS_BUF_CHANGED 0x0001 /* buf_idx changed */
157  /*
158  * must be set whenever buf_idx is changed (as it might be
159  * necessary to recompute the physical address and mapping)
160  *
161  * It is also set by the kernel whenever the buf_idx is
162  * changed internally (e.g., by pipes). Applications may
163  * use this information to know when they can reuse the
164  * contents of previously prepared buffers.
165  */
166 
167 #define NS_REPORT 0x0002 /* ask the hardware to report results */
168  /*
169  * Request notification when slot is used by the hardware.
170  * Normally transmit completions are handled lazily and
171  * may be unreported. This flag lets us know when a slot
172  * has been sent (e.g. to terminate the sender).
173  */
174 
175 #define NS_FORWARD 0x0004 /* pass packet 'forward' */
176  /*
177  * (Only for physical ports, rx rings with NR_FORWARD set).
178  * Slot released to the kernel (i.e. before ring->head) with
179  * this flag set are passed to the peer ring (host/NIC),
180  * thus restoring the host-NIC connection for these slots.
181  * This supports efficient traffic monitoring or firewalling.
182  */
183 
184 #define NS_NO_LEARN 0x0008 /* disable bridge learning */
185  /*
186  * On a VALE switch, do not 'learn' the source port for
187  * this buffer.
188  */
189 
190 #define NS_INDIRECT 0x0010 /* userspace buffer */
191  /*
192  * (VALE tx rings only) data is in a userspace buffer,
193  * whose address is in the 'ptr' field in the slot.
194  */
195 
196 #define NS_MOREFRAG 0x0020 /* packet has more fragments */
197  /*
198  * (VALE ports only)
199  * Set on all but the last slot of a multi-segment packet.
200  * The 'len' field refers to the individual fragment.
201  */
202 
203 #define NS_PORT_SHIFT 8
204 #define NS_PORT_MASK (0xff << NS_PORT_SHIFT)
205  /*
206  * The high 8 bits of the flag, if not zero, indicate the
207  * destination port for the VALE switch, overriding
208  * the lookup table.
209  */
210 
211 #define NS_RFRAGS(_slot) ( ((_slot)->flags >> 8) & 0xff)
212  /*
213  * (VALE rx rings only) the high 8 bits
214  * are the number of fragments.
215  */
216 
217 
218 /*
219  * struct netmap_ring
220  *
221  * Netmap representation of a TX or RX ring (also known as "queue").
222  * This is a queue implemented as a fixed-size circular array.
223  * At the software level the important fields are: head, cur, tail.
224  *
225  * In TX rings:
226  *
227  * head first slot available for transmission.
228  * cur wakeup point. select() and poll() will unblock
229  * when 'tail' moves past 'cur'
230  * tail (readonly) first slot reserved to the kernel
231  *
232  * [head .. tail-1] can be used for new packets to send;
233  * 'head' and 'cur' must be incremented as slots are filled
234  * with new packets to be sent;
235  * 'cur' can be moved further ahead if we need more space
236  * for new transmissions. XXX todo (2014-03-12)
237  *
238  * In RX rings:
239  *
240  * head first valid received packet
241  * cur wakeup point. select() and poll() will unblock
242  * when 'tail' moves past 'cur'
243  * tail (readonly) first slot reserved to the kernel
244  *
245  * [head .. tail-1] contain received packets;
246  * 'head' and 'cur' must be incremented as slots are consumed
247  * and can be returned to the kernel;
248  * 'cur' can be moved further ahead if we want to wait for
249  * new packets without returning the previous ones.
250  *
251  * DATA OWNERSHIP/LOCKING:
252  * The netmap_ring, and all slots and buffers in the range
253  * [head .. tail-1] are owned by the user program;
254  * the kernel only accesses them during a netmap system call
255  * and in the user thread context.
256  *
257  * Other slots and buffers are reserved for use by the kernel
258  */
259 struct netmap_ring {
260  /*
261  * buf_ofs is meant to be used through macros.
262  * It contains the offset of the buffer region from this
263  * descriptor.
264  */
265  const int64_t buf_ofs;
266  const uint32_t num_slots; /* number of slots in the ring. */
267  const uint32_t nr_buf_size;
268  const uint16_t ringid;
269  const uint16_t dir; /* 0: tx, 1: rx */
270 
271  uint32_t head; /* (u) first user slot */
272  uint32_t cur; /* (u) wakeup point */
273  uint32_t tail; /* (k) first kernel slot */
274 
275  uint32_t flags;
276 
277  struct timeval ts; /* (k) time of last *sync() */
278 
279  /* opaque room for a mutex or similar object */
280 #if !defined(_WIN32) || defined(__CYGWIN__)
281  uint8_t __attribute__((__aligned__(NM_CACHE_ALIGN))) sem[128];
282 #else
283  uint8_t __declspec(align(NM_CACHE_ALIGN)) sem[128];
284 #endif
285 
286  /* the slots follow. This struct has variable size */
287  struct netmap_slot slot[0]; /* array of slots. */
288 };
289 
290 
291 /*
292  * RING FLAGS
293  */
294 #define NR_TIMESTAMP 0x0002 /* set timestamp on *sync() */
295  /*
296  * updates the 'ts' field on each netmap syscall. This saves
297  * saves a separate gettimeofday(), and is not much worse than
298  * software timestamps generated in the interrupt handler.
299  */
300 
301 #define NR_FORWARD 0x0004 /* enable NS_FORWARD for ring */
302  /*
303  * Enables the NS_FORWARD slot flag for the ring.
304  */
305 
306 
307 /*
308  * Netmap representation of an interface and its queue(s).
309  * This is initialized by the kernel when binding a file
310  * descriptor to a port, and should be considered as readonly
311  * by user programs. The kernel never uses it.
312  *
313  * There is one netmap_if for each file descriptor on which we want
314  * to select/poll.
315  * select/poll operates on one or all pairs depending on the value of
316  * nmr_queueid passed on the ioctl.
317  */
318 struct netmap_if {
319  char ni_name[IFNAMSIZ]; /* name of the interface. */
320  const uint32_t ni_version; /* API version, currently unused */
321  const uint32_t ni_flags; /* properties */
322 #define NI_PRIV_MEM 0x1 /* private memory region */
323 
324  /*
325  * The number of packet rings available in netmap mode.
326  * Physical NICs can have different numbers of tx and rx rings.
327  * Physical NICs also have a 'host' ring pair.
328  * Additionally, clients can request additional ring pairs to
329  * be used for internal communication.
330  */
331  const uint32_t ni_tx_rings; /* number of HW tx rings */
332  const uint32_t ni_rx_rings; /* number of HW rx rings */
333 
334  uint32_t ni_bufs_head; /* head index for extra bufs */
335  uint32_t ni_spare1[5];
336  /*
337  * The following array contains the offset of each netmap ring
338  * from this structure, in the following order:
339  * NIC tx rings (ni_tx_rings); host tx ring (1); extra tx rings;
340  * NIC rx rings (ni_rx_rings); host tx ring (1); extra rx rings.
341  *
342  * The area is filled up by the kernel on NIOCREGIF,
343  * and then only read by userspace code.
344  */
345  const ssize_t ring_ofs[0];
346 };
347 
348 
349 #ifndef NIOCREGIF
350 /*
351  * ioctl names and related fields
352  *
353  * NIOCTXSYNC, NIOCRXSYNC synchronize tx or rx queues,
354  * whose identity is set in NIOCREGIF through nr_ringid.
355  * These are non blocking and take no argument.
356  *
357  * NIOCGINFO takes a struct ifreq, the interface name is the input,
358  * the outputs are number of queues and number of descriptor
359  * for each queue (useful to set number of threads etc.).
360  * The info returned is only advisory and may change before
361  * the interface is bound to a file descriptor.
362  *
363  * NIOCREGIF takes an interface name within a struct nmre,
364  * and activates netmap mode on the interface (if possible).
365  *
366  * The argument to NIOCGINFO/NIOCREGIF overlays struct ifreq so we
367  * can pass it down to other NIC-related ioctls.
368  *
369  * The actual argument (struct nmreq) has a number of options to request
370  * different functions.
371  * The following are used in NIOCREGIF when nr_cmd == 0:
372  *
373  * nr_name (in)
374  * The name of the port (em0, valeXXX:YYY, etc.)
375  * limited to IFNAMSIZ for backward compatibility.
376  *
377  * nr_version (in/out)
378  * Must match NETMAP_API as used in the kernel, error otherwise.
379  * Always returns the desired value on output.
380  *
381  * nr_tx_slots, nr_tx_slots, nr_tx_rings, nr_rx_rings (in/out)
382  * On input, non-zero values may be used to reconfigure the port
383  * according to the requested values, but this is not guaranteed.
384  * On output the actual values in use are reported.
385  *
386  * nr_ringid (in)
387  * Indicates how rings should be bound to the file descriptors.
388  * If nr_flags != 0, then the low bits (in NETMAP_RING_MASK)
389  * are used to indicate the ring number, and nr_flags specifies
390  * the actual rings to bind. NETMAP_NO_TX_POLL is unaffected.
391  *
392  * NOTE: THE FOLLOWING (nr_flags == 0) IS DEPRECATED:
393  * If nr_flags == 0, NETMAP_HW_RING and NETMAP_SW_RING control
394  * the binding as follows:
395  * 0 (default) binds all physical rings
396  * NETMAP_HW_RING | ring number binds a single ring pair
397  * NETMAP_SW_RING binds only the host tx/rx rings
398  *
399  * NETMAP_NO_TX_POLL can be OR-ed to make select()/poll() push
400  * packets on tx rings only if POLLOUT is set.
401  * The default is to push any pending packet.
402  *
403  * NETMAP_DO_RX_POLL can be OR-ed to make select()/poll() release
404  * packets on rx rings also when POLLIN is NOT set.
405  * The default is to touch the rx ring only with POLLIN.
406  * Note that this is the opposite of TX because it
407  * reflects the common usage.
408  *
409  * NOTE: NETMAP_PRIV_MEM IS DEPRECATED, use nr_arg2 instead.
410  * NETMAP_PRIV_MEM is set on return for ports that do not use
411  * the global memory allocator.
412  * This information is not significant and applications
413  * should look at the region id in nr_arg2
414  *
415  * nr_flags is the recommended mode to indicate which rings should
416  * be bound to a file descriptor. Values are NR_REG_*
417  *
418  * nr_arg1 (in) The number of extra rings to be reserved.
419  * Especially when allocating a VALE port the system only
420  * allocates the amount of memory needed for the port.
421  * If more shared memory rings are desired (e.g. for pipes),
422  * the first invocation for the same basename/allocator
423  * should specify a suitable number. Memory cannot be
424  * extended after the first allocation without closing
425  * all ports on the same region.
426  *
427  * nr_arg2 (in/out) The identity of the memory region used.
428  * On input, 0 means the system decides autonomously,
429  * other values may try to select a specific region.
430  * On return the actual value is reported.
431  * Region '1' is the global allocator, normally shared
432  * by all interfaces. Other values are private regions.
433  * If two ports the same region zero-copy is possible.
434  *
435  * nr_arg3 (in/out) number of extra buffers to be allocated.
436  *
437  *
438  *
439  * nr_cmd (in) if non-zero indicates a special command:
440  * NETMAP_BDG_ATTACH and nr_name = vale*:ifname
441  * attaches the NIC to the switch; nr_ringid specifies
442  * which rings to use. Used by vale-ctl -a ...
443  * nr_arg1 = NETMAP_BDG_HOST also attaches the host port
444  * as in vale-ctl -h ...
445  *
446  * NETMAP_BDG_DETACH and nr_name = vale*:ifname
447  * disconnects a previously attached NIC.
448  * Used by vale-ctl -d ...
449  *
450  * NETMAP_BDG_LIST
451  * list the configuration of VALE switches.
452  *
453  * NETMAP_BDG_VNET_HDR
454  * Set the virtio-net header length used by the client
455  * of a VALE switch port.
456  *
457  * NETMAP_BDG_NEWIF
458  * create a persistent VALE port with name nr_name.
459  * Used by vale-ctl -n ...
460  *
461  * NETMAP_BDG_DELIF
462  * delete a persistent VALE port. Used by vale-ctl -d ...
463  *
464  * nr_arg1, nr_arg2, nr_arg3 (in/out) command specific
465  *
466  *
467  *
468  */
469 
470 
471 /*
472  * struct nmreq overlays a struct ifreq (just the name)
473  */
474 struct nmreq {
475  char nr_name[IFNAMSIZ];
476  uint32_t nr_version; /* API version */
477  uint32_t nr_offset; /* nifp offset in the shared region */
478  uint32_t nr_memsize; /* size of the shared region */
479  uint32_t nr_tx_slots; /* slots in tx rings */
480  uint32_t nr_rx_slots; /* slots in rx rings */
481  uint16_t nr_tx_rings; /* number of tx rings */
482  uint16_t nr_rx_rings; /* number of rx rings */
483 
484  uint16_t nr_ringid; /* ring(s) we care about */
485 #define NETMAP_HW_RING 0x4000 /* single NIC ring pair */
486 #define NETMAP_SW_RING 0x2000 /* only host ring pair */
487 
488 #define NETMAP_RING_MASK 0x0fff /* the ring number */
489 
490 #define NETMAP_NO_TX_POLL 0x1000 /* no automatic txsync on poll */
491 
492 #define NETMAP_DO_RX_POLL 0x8000 /* DO automatic rxsync on poll */
493 
494  uint16_t nr_cmd;
495 #define NETMAP_BDG_ATTACH 1 /* attach the NIC */
496 #define NETMAP_BDG_DETACH 2 /* detach the NIC */
497 #define NETMAP_BDG_REGOPS 3 /* register bridge callbacks */
498 #define NETMAP_BDG_LIST 4 /* get bridge's info */
499 #define NETMAP_BDG_VNET_HDR 5 /* set the port virtio-net-hdr length */
500 #define NETMAP_BDG_OFFSET NETMAP_BDG_VNET_HDR /* deprecated alias */
501 #define NETMAP_BDG_NEWIF 6 /* create a virtual port */
502 #define NETMAP_BDG_DELIF 7 /* destroy a virtual port */
503 #define NETMAP_PT_HOST_CREATE 8 /* create ptnetmap kthreads */
504 #define NETMAP_PT_HOST_DELETE 9 /* delete ptnetmap kthreads */
505 #define NETMAP_BDG_POLLING_ON 10 /* delete polling kthread */
506 #define NETMAP_BDG_POLLING_OFF 11 /* delete polling kthread */
507 #define NETMAP_VNET_HDR_GET 12 /* get the port virtio-net-hdr length */
508  uint16_t nr_arg1; /* reserve extra rings in NIOCREGIF */
509 #define NETMAP_BDG_HOST 1 /* attach the host stack on ATTACH */
510 
511  uint16_t nr_arg2;
512  uint32_t nr_arg3; /* req. extra buffers in NIOCREGIF */
513  uint32_t nr_flags;
514  /* various modes, extends nr_ringid */
515  uint32_t spare2[1];
516 };
517 
518 #define NR_REG_MASK 0xf /* values for nr_flags */
519 enum { NR_REG_DEFAULT = 0, /* backward compat, should not be used. */
526 };
527 /* monitor uses the NR_REG to select the rings to monitor */
528 #define NR_MONITOR_TX 0x100
529 #define NR_MONITOR_RX 0x200
530 #define NR_ZCOPY_MON 0x400
531 /* request exclusive access to the selected rings */
532 #define NR_EXCLUSIVE 0x800
533 /* request ptnetmap host support */
534 #define NR_PASSTHROUGH_HOST NR_PTNETMAP_HOST /* deprecated */
535 #define NR_PTNETMAP_HOST 0x1000
536 #define NR_RX_RINGS_ONLY 0x2000
537 #define NR_TX_RINGS_ONLY 0x4000
538 /* Applications set this flag if they are able to deal with virtio-net headers,
539  * that is send/receive frames that start with a virtio-net header.
540  * If not set, NIOCREGIF will fail with netmap ports that require applications
541  * to use those headers. If the flag is set, the application can use the
542  * NETMAP_VNET_HDR_GET command to figure out the header length. */
543 #define NR_ACCEPT_VNET_HDR 0x8000
544 
545 
546 /*
547  * Windows does not have _IOWR(). _IO(), _IOW() and _IOR() are defined
548  * in ws2def.h but not sure if they are in the form we need.
549  * XXX so we redefine them
550  * in a convenient way to use for DeviceIoControl signatures
551  */
552 #ifdef _WIN32
553 #undef _IO // ws2def.h
554 #define _WIN_NM_IOCTL_TYPE 40000
555 #define _IO(_c, _n) CTL_CODE(_WIN_NM_IOCTL_TYPE, ((_n) + 0x800) , \
556  METHOD_BUFFERED, FILE_ANY_ACCESS )
557 #define _IO_direct(_c, _n) CTL_CODE(_WIN_NM_IOCTL_TYPE, ((_n) + 0x800) , \
558  METHOD_OUT_DIRECT, FILE_ANY_ACCESS )
559 
560 #define _IOWR(_c, _n, _s) _IO(_c, _n)
561 
562 /* We havesome internal sysctl in addition to the externally visible ones */
563 #define NETMAP_MMAP _IO_direct('i', 160) // note METHOD_OUT_DIRECT
564 #define NETMAP_POLL _IO('i', 162)
565 
566 /* and also two setsockopt for sysctl emulation */
567 #define NETMAP_SETSOCKOPT _IO('i', 140)
568 #define NETMAP_GETSOCKOPT _IO('i', 141)
569 
570 
571 //These linknames are for the Netmap Core Driver
572 #define NETMAP_NT_DEVICE_NAME L"\\Device\\NETMAP"
573 #define NETMAP_DOS_DEVICE_NAME L"\\DosDevices\\netmap"
574 
575 //Definition of a structure used to pass a virtual address within an IOCTL
576 typedef struct _MEMORY_ENTRY {
577  PVOID pUsermodeVirtualAddress;
578 } MEMORY_ENTRY, *PMEMORY_ENTRY;
579 
580 typedef struct _POLL_REQUEST_DATA {
581  int events;
582  int timeout;
583  int revents;
584 } POLL_REQUEST_DATA;
585 
586 #endif /* _WIN32 */
587 
588 /*
589  * FreeBSD uses the size value embedded in the _IOWR to determine
590  * how much to copy in/out. So we need it to match the actual
591  * data structure we pass. We put some spares in the structure
592  * to ease compatibility with other versions
593  */
594 #define NIOCGINFO _IOWR('i', 145, struct nmreq) /* return IF info */
595 #define NIOCREGIF _IOWR('i', 146, struct nmreq) /* interface register */
596 #define NIOCTXSYNC _IO('i', 148) /* sync tx queues */
597 #define NIOCRXSYNC _IO('i', 149) /* sync rx queues */
598 #define NIOCCONFIG _IOWR('i',150, struct nm_ifreq) /* for ext. modules */
599 #endif /* !NIOCREGIF */
600 
601 
602 /*
603  * Helper functions for kernel and userspace
604  */
605 
606 /*
607  * check if space is available in the ring.
608  */
609 static inline int
611 {
612  return (ring->cur == ring->tail);
613 }
614 
615 /*
616  * Opaque structure that is passed to an external kernel
617  * module via ioctl(fd, NIOCCONFIG, req) for a user-owned
618  * bridge port (at this point ephemeral VALE interface).
619  */
620 #define NM_IFRDATA_LEN 256
621 struct nm_ifreq {
622  char nifr_name[IFNAMSIZ];
623  char data[NM_IFRDATA_LEN];
624 };
625 
626 /*
627  * netmap kernel thread configuration
628  */
629 /* bhyve/vmm.ko MSIX parameters for IOCTL */
631  uint64_t msg;
632  uint64_t addr;
633 };
634 
635 /* IOCTL parameters */
636 struct nm_kth_ioctl {
637  u_long com;
638  /* TODO: use union */
639  union {
640  struct ptn_vmm_ioctl_msix msix;
641  } data;
642 };
643 
644 /* Configuration of a ptnetmap ring */
646  uint64_t ioeventfd; /* eventfd in linux, tsleep() parameter in FreeBSD */
647  uint64_t irqfd; /* eventfd in linux, ioctl fd in FreeBSD */
648  struct nm_kth_ioctl ioctl; /* ioctl parameter to send irq (only used in bhyve/FreeBSD) */
649 };
650 #endif /* _NET_NETMAP_H_ */
uint16_t nr_ringid
Definition: net_netmap.h:484
const uint32_t num_slots
Definition: net_netmap.h:266
uint32_t nr_rx_slots
Definition: net_netmap.h:480
uint64_t irqfd
Definition: net_netmap.h:647
uint16_t nr_rx_rings
Definition: net_netmap.h:482
uint32_t nr_offset
Definition: net_netmap.h:477
uint32_t flags
Definition: net_netmap.h:275
uint16_t nr_tx_rings
Definition: net_netmap.h:481
uint16_t flags
Definition: net_netmap.h:148
const int64_t buf_ofs
Definition: net_netmap.h:265
static int nm_ring_empty(struct netmap_ring *ring)
Definition: net_netmap.h:610
uint32_t cur
Definition: net_netmap.h:272
uint32_t nr_tx_slots
Definition: net_netmap.h:479
uint32_t nr_memsize
Definition: net_netmap.h:478
const uint32_t ni_tx_rings
Definition: net_netmap.h:331
uint16_t nr_arg1
Definition: net_netmap.h:508
uint16_t len
Definition: net_netmap.h:147
#define NM_IFRDATA_LEN
Definition: net_netmap.h:620
uint64_t ptr
Definition: net_netmap.h:149
const uint32_t ni_rx_rings
Definition: net_netmap.h:332
uint32_t ni_bufs_head
Definition: net_netmap.h:334
const uint32_t ni_version
Definition: net_netmap.h:320
uint32_t nr_version
Definition: net_netmap.h:476
uint32_t buf_idx
Definition: net_netmap.h:146
u_long com
Definition: net_netmap.h:637
#define NM_CACHE_ALIGN
Definition: net_netmap.h:52
uint64_t ioeventfd
Definition: net_netmap.h:646
uint32_t head
Definition: net_netmap.h:271
uint32_t tail
Definition: net_netmap.h:273
const uint16_t dir
Definition: net_netmap.h:269
const uint32_t nr_buf_size
Definition: net_netmap.h:267
uint32_t nr_arg3
Definition: net_netmap.h:512
const uint16_t ringid
Definition: net_netmap.h:268
uint16_t nr_arg2
Definition: net_netmap.h:511
uint16_t nr_cmd
Definition: net_netmap.h:494
const uint32_t ni_flags
Definition: net_netmap.h:321
uint32_t nr_flags
Definition: net_netmap.h:513