2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (C) 2011-2016 Universita` di Pisa
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
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15 * documentation and/or other materials provided with the distribution.
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24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * Functions and macros to manipulate netmap structures and packets
34 * in userspace. See netmap(4) for more information.
36 * The address of the struct netmap_if, say nifp, is computed from the
37 * value returned from ioctl(.., NIOCREG, ...) and the mmap region:
38 * ioctl(fd, NIOCREG, &req);
39 * mem = mmap(0, ... );
40 * nifp = NETMAP_IF(mem, req.nr_nifp);
41 * (so simple, we could just do it manually)
44 * struct netmap_ring *NETMAP_TXRING(nifp, index)
45 * struct netmap_ring *NETMAP_RXRING(nifp, index)
46 * we can access ring->cur, ring->head, ring->tail, etc.
48 * ring->slot[i] gives us the i-th slot (we can access
49 * directly len, flags, buf_idx)
51 * char *buf = NETMAP_BUF(ring, x) returns a pointer to
52 * the buffer numbered x
54 * All ring indexes (head, cur, tail) should always move forward.
55 * To compute the next index in a circular ring you can use
56 * i = nm_ring_next(ring, i);
58 * To ease porting apps from pcap to netmap we supply a few fuctions
59 * that can be called to open, close, read and write on netmap in a way
60 * similar to libpcap. Note that the read/write function depend on
61 * an ioctl()/select()/poll() being issued to refill rings or push
64 * In order to use these, include #define NETMAP_WITH_LIBS
65 * in the source file that invokes these functions.
68 #ifndef _NET_NETMAP_USER_H_
69 #define _NET_NETMAP_USER_H_
71 #define NETMAP_DEVICE_NAME "/dev/netmap"
75 * we can compile userspace apps with either cygwin or msvc,
76 * and we use _WIN32 to identify windows specific code
82 #endif /* __CYGWIN__ */
85 #undef NETMAP_DEVICE_NAME
86 #define NETMAP_DEVICE_NAME "/proc/sys/DosDevices/Global/netmap"
89 #include <sys/cygwin.h>
93 #include <sys/socket.h> /* apple needs sockaddr */
94 #include <net/if.h> /* IFNAMSIZ */
96 #include <string.h> /* memset */
97 #include <sys/time.h> /* gettimeofday */
100 #define likely(x) __builtin_expect(!!(x), 1)
101 #define unlikely(x) __builtin_expect(!!(x), 0)
102 #endif /* likely and unlikely */
104 #include <net/netmap.h>
107 #define _NETMAP_OFFSET(type, ptr, offset) \
108 ((type)(void *)((char *)(ptr) + (offset)))
110 #define NETMAP_IF(_base, _ofs) _NETMAP_OFFSET(struct netmap_if *, _base, _ofs)
112 #define NETMAP_TXRING(nifp, index) _NETMAP_OFFSET(struct netmap_ring *, \
113 nifp, (nifp)->ring_ofs[index] )
115 #define NETMAP_RXRING(nifp, index) _NETMAP_OFFSET(struct netmap_ring *, \
116 nifp, (nifp)->ring_ofs[index + (nifp)->ni_tx_rings + \
117 (nifp)->ni_host_tx_rings] )
119 #define NETMAP_BUF(ring, index) \
120 ((char *)(ring) + (ring)->buf_ofs + ((index)*(ring)->nr_buf_size))
122 #define NETMAP_BUF_IDX(ring, buf) \
123 ( ((char *)(buf) - ((char *)(ring) + (ring)->buf_ofs) ) / \
124 (ring)->nr_buf_size )
127 static inline uint32_t
128 nm_ring_next(struct netmap_ring *r, uint32_t i)
130 return ( unlikely(i + 1 == r->num_slots) ? 0 : i + 1);
135 * Return 1 if we have pending transmissions in the tx ring.
136 * When everything is complete ring->head = ring->tail + 1 (modulo ring size)
139 nm_tx_pending(struct netmap_ring *r)
141 return nm_ring_next(r, r->tail) != r->head;
144 /* Compute the number of slots available in the netmap ring. We use
145 * ring->head as explained in the comment above nm_ring_empty(). */
146 static inline uint32_t
147 nm_ring_space(struct netmap_ring *ring)
149 int ret = ring->tail - ring->head;
151 ret += ring->num_slots;
155 #ifndef ND /* debug macros */
157 #define ND(_fmt, ...) do {} while(0)
158 #define D(_fmt, ...) \
160 struct timeval _t0; \
161 gettimeofday(&_t0, NULL); \
162 fprintf(stderr, "%03d.%06d %s [%d] " _fmt "\n", \
163 (int)(_t0.tv_sec % 1000), (int)_t0.tv_usec, \
164 __FUNCTION__, __LINE__, ##__VA_ARGS__); \
167 /* Rate limited version of "D", lps indicates how many per second */
168 #define RD(lps, format, ...) \
170 static int __t0, __cnt; \
171 struct timeval __xxts; \
172 gettimeofday(&__xxts, NULL); \
173 if (__t0 != __xxts.tv_sec) { \
174 __t0 = __xxts.tv_sec; \
177 if (__cnt++ < lps) { \
178 D(format, ##__VA_ARGS__); \
184 * this is a slightly optimized copy routine which rounds
185 * to multiple of 64 bytes and is often faster than dealing
186 * with other odd sizes. We assume there is enough room
187 * in the source and destination buffers.
190 nm_pkt_copy(const void *_src, void *_dst, int l)
192 const uint64_t *src = (const uint64_t *)_src;
193 uint64_t *dst = (uint64_t *)_dst;
195 if (unlikely(l >= 1024 || l % 64)) {
199 for (; likely(l > 0); l-=64) {
211 #ifdef NETMAP_WITH_LIBS
213 * Support for simple I/O libraries.
214 * Include other system headers required for compiling this.
217 #ifndef HAVE_NETMAP_WITH_LIBS
218 #define HAVE_NETMAP_WITH_LIBS
221 #include <sys/time.h>
222 #include <sys/mman.h>
223 #include <sys/ioctl.h>
224 #include <sys/errno.h> /* EINVAL */
225 #include <fcntl.h> /* O_RDWR */
226 #include <unistd.h> /* close() */
230 struct nm_pkthdr { /* first part is the same as pcap_pkthdr */
235 uint64_t flags; /* NM_MORE_PKTS etc */
236 #define NM_MORE_PKTS 1
238 struct netmap_slot *slot;
242 struct nm_stat { /* same as pcap_stat */
246 #ifdef WIN32 /* XXX or _WIN32 ? */
251 #define NM_ERRBUF_SIZE 512
254 struct nm_desc *self; /* point to self if netmap. */
258 int done_mmap; /* set if mem is the result of mmap */
259 struct netmap_if * const nifp;
260 uint16_t first_tx_ring, last_tx_ring, cur_tx_ring;
261 uint16_t first_rx_ring, last_rx_ring, cur_rx_ring;
262 struct nmreq req; /* also contains the nr_name = ifname */
263 struct nm_pkthdr hdr;
266 * The memory contains netmap_if, rings and then buffers.
267 * Given a pointer (e.g. to nm_inject) we can compare with
268 * mem/buf_start/buf_end to tell if it is a buffer or
269 * some other descriptor in our region.
270 * We also store a pointer to some ring as it helps in the
271 * translation from buffer indexes to addresses.
273 struct netmap_ring * const some_ring;
274 void * const buf_start;
275 void * const buf_end;
276 /* parameters from pcap_open_live */
282 /* save flags so we can restore them on close */
288 char msg[NM_ERRBUF_SIZE];
292 * when the descriptor is open correctly, d->self == d
293 * Eventually we should also use some magic number.
295 #define P2NMD(p) ((struct nm_desc *)(p))
296 #define IS_NETMAP_DESC(d) ((d) && P2NMD(d)->self == P2NMD(d))
297 #define NETMAP_FD(d) (P2NMD(d)->fd)
303 * The callback, invoked on each received packet. Same as libpcap
305 typedef void (*nm_cb_t)(u_char *, const struct nm_pkthdr *, const u_char *d);
308 *--- the pcap-like API ---
310 * nm_open() opens a file descriptor, binds to a port and maps memory.
312 * ifname (netmap:foo or vale:foo) is the port name
313 * a suffix can indicate the follwing:
314 * ^ bind the host (sw) ring pair
315 * * bind host and NIC ring pairs
316 * -NN bind individual NIC ring pair
317 * {NN bind master side of pipe NN
318 * }NN bind slave side of pipe NN
319 * a suffix starting with / and the following flags,
322 * z zero copy monitor (both tx and rx)
323 * t monitor tx side (copy monitor)
324 * r monitor rx side (copy monitor)
325 * R bind only RX ring(s)
326 * T bind only TX ring(s)
328 * req provides the initial values of nmreq before parsing ifname.
329 * Remember that the ifname parsing will override the ring
330 * number in nm_ringid, and part of nm_flags;
331 * flags special functions, normally 0
332 * indicates which fields of *arg are significant
333 * arg special functions, normally NULL
334 * if passed a netmap_desc with mem != NULL,
335 * use that memory instead of mmap.
338 static struct nm_desc *nm_open(const char *ifname, const struct nmreq *req,
339 uint64_t flags, const struct nm_desc *arg);
342 * nm_open can import some fields from the parent descriptor.
343 * These flags control which ones.
344 * Also in flags you can specify NETMAP_NO_TX_POLL and NETMAP_DO_RX_POLL,
345 * which set the initial value for these flags.
346 * Note that the 16 low bits of the flags are reserved for data
347 * that may go into the nmreq.
350 NM_OPEN_NO_MMAP = 0x040000, /* reuse mmap from parent */
351 NM_OPEN_IFNAME = 0x080000, /* nr_name, nr_ringid, nr_flags */
352 NM_OPEN_ARG1 = 0x100000,
353 NM_OPEN_ARG2 = 0x200000,
354 NM_OPEN_ARG3 = 0x400000,
355 NM_OPEN_RING_CFG = 0x800000, /* tx|rx rings|slots */
360 * nm_close() closes and restores the port to its previous state
363 static int nm_close(struct nm_desc *);
366 * nm_mmap() do mmap or inherit from parent if the nr_arg2
367 * (memory block) matches.
370 static int nm_mmap(struct nm_desc *, const struct nm_desc *);
373 * nm_inject() is the same as pcap_inject()
374 * nm_dispatch() is the same as pcap_dispatch()
375 * nm_nextpkt() is the same as pcap_next()
378 static int nm_inject(struct nm_desc *, const void *, size_t);
379 static int nm_dispatch(struct nm_desc *, int, nm_cb_t, u_char *);
380 static u_char *nm_nextpkt(struct nm_desc *, struct nm_pkthdr *);
384 intptr_t _get_osfhandle(int); /* defined in io.h in windows */
387 * In windows we do not have yet native poll support, so we keep track
388 * of file descriptors associated to netmap ports to emulate poll on
389 * them and fall back on regular poll on other file descriptors.
391 struct win_netmap_fd_list {
392 struct win_netmap_fd_list *next;
394 HANDLE win_netmap_handle;
398 * list head containing all the netmap opened fd and their
399 * windows HANDLE counterparts
401 static struct win_netmap_fd_list *win_netmap_fd_list_head;
404 win_insert_fd_record(int fd)
406 struct win_netmap_fd_list *curr;
408 for (curr = win_netmap_fd_list_head; curr; curr = curr->next) {
409 if (fd == curr->win_netmap_fd) {
413 curr = calloc(1, sizeof(*curr));
414 curr->next = win_netmap_fd_list_head;
415 curr->win_netmap_fd = fd;
416 curr->win_netmap_handle = IntToPtr(_get_osfhandle(fd));
417 win_netmap_fd_list_head = curr;
421 win_remove_fd_record(int fd)
423 struct win_netmap_fd_list *curr = win_netmap_fd_list_head;
424 struct win_netmap_fd_list *prev = NULL;
425 for (; curr ; prev = curr, curr = curr->next) {
426 if (fd != curr->win_netmap_fd)
428 /* found the entry */
429 if (prev == NULL) { /* we are freeing the first entry */
430 win_netmap_fd_list_head = curr->next;
432 prev->next = curr->next;
441 win_get_netmap_handle(int fd)
443 struct win_netmap_fd_list *curr;
445 for (curr = win_netmap_fd_list_head; curr; curr = curr->next) {
446 if (fd == curr->win_netmap_fd) {
447 return curr->win_netmap_handle;
454 * we need to wrap ioctl and mmap, at least for the netmap file descriptors
458 * use this function only from netmap_user.h internal functions
459 * same as ioctl, returns 0 on success and -1 on error
462 win_nm_ioctl_internal(HANDLE h, int32_t ctlCode, void *arg)
464 DWORD bReturn = 0, szIn, szOut;
465 BOOL ioctlReturnStatus;
466 void *inParam = arg, *outParam = arg;
470 szIn = sizeof(POLL_REQUEST_DATA);
471 szOut = sizeof(POLL_REQUEST_DATA);
475 szOut = sizeof(void*);
476 inParam = NULL; /* nothing on input */
484 szIn = sizeof(struct nmreq);
485 szOut = sizeof(struct nmreq);
488 D("unsupported NIOCCONFIG!");
491 default: /* a regular ioctl */
492 D("invalid ioctl %x on netmap fd", ctlCode);
496 ioctlReturnStatus = DeviceIoControl(h,
497 ctlCode, inParam, szIn,
500 // XXX note windows returns 0 on error or async call, 1 on success
501 // we could call GetLastError() to figure out what happened
502 return ioctlReturnStatus ? 0 : -1;
506 * this function is what must be called from user-space programs
507 * same as ioctl, returns 0 on success and -1 on error
510 win_nm_ioctl(int fd, int32_t ctlCode, void *arg)
512 HANDLE h = win_get_netmap_handle(fd);
515 return ioctl(fd, ctlCode, arg);
517 return win_nm_ioctl_internal(h, ctlCode, arg);
521 #define ioctl win_nm_ioctl /* from now on, within this file ... */
524 * We cannot use the native mmap on windows
525 * The only parameter used is "fd", the other ones are just declared to
526 * make this signature comparable to the FreeBSD/Linux one
529 win32_mmap_emulated(void *addr, size_t length, int prot, int flags, int fd, int32_t offset)
531 HANDLE h = win_get_netmap_handle(fd);
534 return mmap(addr, length, prot, flags, fd, offset);
538 return win_nm_ioctl_internal(h, NETMAP_MMAP, &ret) ?
539 NULL : ret.pUsermodeVirtualAddress;
543 #define mmap win32_mmap_emulated
545 #include <sys/poll.h> /* XXX needed to use the structure pollfd */
548 win_nm_poll(struct pollfd *fds, int nfds, int timeout)
552 if (nfds != 1 || fds == NULL || (h = win_get_netmap_handle(fds->fd)) == NULL) {;
553 return poll(fds, nfds, timeout);
555 POLL_REQUEST_DATA prd;
557 prd.timeout = timeout;
558 prd.events = fds->events;
560 win_nm_ioctl_internal(h, NETMAP_POLL, &prd);
561 if ((prd.revents == POLLERR) || (prd.revents == STATUS_TIMEOUT)) {
568 #define poll win_nm_poll
571 win_nm_open(char* pathname, int flags)
574 if (strcmp(pathname, NETMAP_DEVICE_NAME) == 0) {
575 int fd = open(NETMAP_DEVICE_NAME, O_RDWR);
580 win_insert_fd_record(fd);
583 return open(pathname, flags);
587 #define open win_nm_open
594 if (win_get_netmap_handle(fd) != NULL) {
595 win_remove_fd_record(fd);
601 #define close win_nm_close
606 nm_is_identifier(const char *s, const char *e)
608 for (; s != e; s++) {
609 if (!isalnum(*s) && *s != '_') {
619 nm_parse(const char *ifname, struct nm_desc *d, char *err)
622 const char *port = NULL;
623 const char *vpname = NULL;
625 uint32_t nr_ringid = 0, nr_flags;
626 char errmsg[MAXERRMSG] = "";
628 uint16_t nr_arg2 = 0;
629 enum { P_START, P_RNGSFXOK, P_GETNUM, P_FLAGS, P_FLAGSOK, P_MEMID } p_state;
633 is_vale = (ifname[0] == 'v');
635 port = index(ifname, ':');
637 snprintf(errmsg, MAXERRMSG,
638 "missing ':' in vale name");
642 if (!nm_is_identifier(ifname + 4, port)) {
643 snprintf(errmsg, MAXERRMSG, "invalid bridge name");
653 /* scan for a separator */
654 for (; *port && !index("-*^{}/@", *port); port++)
657 if (is_vale && !nm_is_identifier(vpname, port)) {
658 snprintf(errmsg, MAXERRMSG, "invalid bridge port name");
662 namelen = port - ifname;
663 if (namelen >= sizeof(d->req.nr_name)) {
664 snprintf(errmsg, MAXERRMSG, "name too long");
667 memcpy(d->req.nr_name, ifname, namelen);
668 d->req.nr_name[namelen] = '\0';
671 nr_flags = NR_REG_ALL_NIC; /* default for no suffix */
676 case '^': /* only SW ring */
677 nr_flags = NR_REG_SW;
678 p_state = P_RNGSFXOK;
680 case '*': /* NIC and SW */
681 nr_flags = NR_REG_NIC_SW;
682 p_state = P_RNGSFXOK;
684 case '-': /* one NIC ring pair */
685 nr_flags = NR_REG_ONE_NIC;
688 case '{': /* pipe (master endpoint) */
689 nr_flags = NR_REG_PIPE_MASTER;
692 case '}': /* pipe (slave endoint) */
693 nr_flags = NR_REG_PIPE_SLAVE;
696 case '/': /* start of flags */
699 case '@': /* start of memid */
703 snprintf(errmsg, MAXERRMSG, "unknown modifier: '%c'", *port);
717 snprintf(errmsg, MAXERRMSG, "unexpected character: '%c'", *port);
723 num = strtol(port, (char **)&port, 10);
724 if (num < 0 || num >= NETMAP_RING_MASK) {
725 snprintf(errmsg, MAXERRMSG, "'%ld' out of range [0, %d)",
726 num, NETMAP_RING_MASK);
729 nr_ringid = num & NETMAP_RING_MASK;
730 p_state = P_RNGSFXOK;
741 nr_flags |= NR_EXCLUSIVE;
744 nr_flags |= NR_ZCOPY_MON;
747 nr_flags |= NR_MONITOR_TX;
750 nr_flags |= NR_MONITOR_RX;
753 nr_flags |= NR_RX_RINGS_ONLY;
756 nr_flags |= NR_TX_RINGS_ONLY;
759 snprintf(errmsg, MAXERRMSG, "unrecognized flag: '%c'", *port);
767 snprintf(errmsg, MAXERRMSG, "double setting of memid");
770 num = strtol(port, (char **)&port, 10);
772 snprintf(errmsg, MAXERRMSG, "invalid memid %ld, must be >0", num);
776 p_state = P_RNGSFXOK;
780 if (p_state != P_START && p_state != P_RNGSFXOK && p_state != P_FLAGSOK) {
781 snprintf(errmsg, MAXERRMSG, "unexpected end of port name");
784 ND("flags: %s %s %s %s",
785 (nr_flags & NR_EXCLUSIVE) ? "EXCLUSIVE" : "",
786 (nr_flags & NR_ZCOPY_MON) ? "ZCOPY_MON" : "",
787 (nr_flags & NR_MONITOR_TX) ? "MONITOR_TX" : "",
788 (nr_flags & NR_MONITOR_RX) ? "MONITOR_RX" : "");
790 d->req.nr_flags |= nr_flags;
791 d->req.nr_ringid |= nr_ringid;
792 d->req.nr_arg2 = nr_arg2;
801 strncpy(err, errmsg, MAXERRMSG);
806 * Try to open, return descriptor if successful, NULL otherwise.
807 * An invalid netmap name will return errno = 0;
808 * You can pass a pointer to a pre-filled nm_desc to add special
809 * parameters. Flags is used as follows
810 * NM_OPEN_NO_MMAP use the memory from arg, only XXX avoid mmap
811 * if the nr_arg2 (memory block) matches.
812 * NM_OPEN_ARG1 use req.nr_arg1 from arg
813 * NM_OPEN_ARG2 use req.nr_arg2 from arg
814 * NM_OPEN_RING_CFG user ring config from arg
816 static struct nm_desc *
817 nm_open(const char *ifname, const struct nmreq *req,
818 uint64_t new_flags, const struct nm_desc *arg)
820 struct nm_desc *d = NULL;
821 const struct nm_desc *parent = arg;
822 char errmsg[MAXERRMSG] = "";
825 if (strncmp(ifname, "netmap:", 7) &&
826 strncmp(ifname, NM_BDG_NAME, strlen(NM_BDG_NAME))) {
827 errno = 0; /* name not recognised, not an error */
831 d = (struct nm_desc *)calloc(1, sizeof(*d));
833 snprintf(errmsg, MAXERRMSG, "nm_desc alloc failure");
837 d->self = d; /* set this early so nm_close() works */
838 d->fd = open(NETMAP_DEVICE_NAME, O_RDWR);
840 snprintf(errmsg, MAXERRMSG, "cannot open /dev/netmap: %s", strerror(errno));
847 if (!(new_flags & NM_OPEN_IFNAME)) {
848 if (nm_parse(ifname, d, errmsg) < 0)
852 d->req.nr_version = NETMAP_API;
853 d->req.nr_ringid &= NETMAP_RING_MASK;
855 /* optionally import info from parent */
856 if (IS_NETMAP_DESC(parent) && new_flags) {
857 if (new_flags & NM_OPEN_ARG1)
858 D("overriding ARG1 %d", parent->req.nr_arg1);
859 d->req.nr_arg1 = new_flags & NM_OPEN_ARG1 ?
860 parent->req.nr_arg1 : 4;
861 if (new_flags & NM_OPEN_ARG2) {
862 D("overriding ARG2 %d", parent->req.nr_arg2);
863 d->req.nr_arg2 = parent->req.nr_arg2;
865 if (new_flags & NM_OPEN_ARG3)
866 D("overriding ARG3 %d", parent->req.nr_arg3);
867 d->req.nr_arg3 = new_flags & NM_OPEN_ARG3 ?
868 parent->req.nr_arg3 : 0;
869 if (new_flags & NM_OPEN_RING_CFG) {
870 D("overriding RING_CFG");
871 d->req.nr_tx_slots = parent->req.nr_tx_slots;
872 d->req.nr_rx_slots = parent->req.nr_rx_slots;
873 d->req.nr_tx_rings = parent->req.nr_tx_rings;
874 d->req.nr_rx_rings = parent->req.nr_rx_rings;
876 if (new_flags & NM_OPEN_IFNAME) {
877 D("overriding ifname %s ringid 0x%x flags 0x%x",
878 parent->req.nr_name, parent->req.nr_ringid,
879 parent->req.nr_flags);
880 memcpy(d->req.nr_name, parent->req.nr_name,
881 sizeof(d->req.nr_name));
882 d->req.nr_ringid = parent->req.nr_ringid;
883 d->req.nr_flags = parent->req.nr_flags;
886 /* add the *XPOLL flags */
887 d->req.nr_ringid |= new_flags & (NETMAP_NO_TX_POLL | NETMAP_DO_RX_POLL);
889 if (ioctl(d->fd, NIOCREGIF, &d->req)) {
890 snprintf(errmsg, MAXERRMSG, "NIOCREGIF failed: %s", strerror(errno));
894 nr_reg = d->req.nr_flags & NR_REG_MASK;
896 if (nr_reg == NR_REG_SW) { /* host stack */
897 d->first_tx_ring = d->last_tx_ring = d->req.nr_tx_rings;
898 d->first_rx_ring = d->last_rx_ring = d->req.nr_rx_rings;
899 } else if (nr_reg == NR_REG_ALL_NIC) { /* only nic */
900 d->first_tx_ring = 0;
901 d->first_rx_ring = 0;
902 d->last_tx_ring = d->req.nr_tx_rings - 1;
903 d->last_rx_ring = d->req.nr_rx_rings - 1;
904 } else if (nr_reg == NR_REG_NIC_SW) {
905 d->first_tx_ring = 0;
906 d->first_rx_ring = 0;
907 d->last_tx_ring = d->req.nr_tx_rings;
908 d->last_rx_ring = d->req.nr_rx_rings;
909 } else if (nr_reg == NR_REG_ONE_NIC) {
910 /* XXX check validity */
911 d->first_tx_ring = d->last_tx_ring =
912 d->first_rx_ring = d->last_rx_ring = d->req.nr_ringid & NETMAP_RING_MASK;
914 d->first_tx_ring = d->last_tx_ring = 0;
915 d->first_rx_ring = d->last_rx_ring = 0;
918 /* if parent is defined, do nm_mmap() even if NM_OPEN_NO_MMAP is set */
919 if ((!(new_flags & NM_OPEN_NO_MMAP) || parent) && nm_mmap(d, parent)) {
920 snprintf(errmsg, MAXERRMSG, "mmap failed: %s", strerror(errno));
925 #ifdef DEBUG_NETMAP_USER
926 { /* debugging code */
929 D("%s tx %d .. %d %d rx %d .. %d %d", ifname,
930 d->first_tx_ring, d->last_tx_ring, d->req.nr_tx_rings,
931 d->first_rx_ring, d->last_rx_ring, d->req.nr_rx_rings);
932 for (i = 0; i <= d->req.nr_tx_rings; i++) {
933 struct netmap_ring *r = NETMAP_TXRING(d->nifp, i);
934 D("TX%d %p h %d c %d t %d", i, r, r->head, r->cur, r->tail);
936 for (i = 0; i <= d->req.nr_rx_rings; i++) {
937 struct netmap_ring *r = NETMAP_RXRING(d->nifp, i);
938 D("RX%d %p h %d c %d t %d", i, r, r->head, r->cur, r->tail);
941 #endif /* debugging */
943 d->cur_tx_ring = d->first_tx_ring;
944 d->cur_rx_ring = d->first_rx_ring;
950 D("%s %s", errmsg, ifname);
958 nm_close(struct nm_desc *d)
961 * ugly trick to avoid unused warnings
963 static void *__xxzt[] __attribute__ ((unused)) =
964 { (void *)nm_open, (void *)nm_inject,
965 (void *)nm_dispatch, (void *)nm_nextpkt } ;
967 if (d == NULL || d->self != d)
969 if (d->done_mmap && d->mem)
970 munmap(d->mem, d->memsize);
975 bzero(d, sizeof(*d));
982 nm_mmap(struct nm_desc *d, const struct nm_desc *parent)
984 //XXX TODO: check if mmap is already done
986 if (IS_NETMAP_DESC(parent) && parent->mem &&
987 parent->req.nr_arg2 == d->req.nr_arg2) {
988 /* do not mmap, inherit from parent */
989 D("do not mmap, inherit from parent");
990 d->memsize = parent->memsize;
991 d->mem = parent->mem;
993 /* XXX TODO: check if memsize is too large (or there is overflow) */
994 d->memsize = d->req.nr_memsize;
995 d->mem = mmap(0, d->memsize, PROT_WRITE | PROT_READ, MAP_SHARED,
997 if (d->mem == MAP_FAILED) {
1003 struct netmap_if *nifp = NETMAP_IF(d->mem, d->req.nr_offset);
1004 struct netmap_ring *r = NETMAP_RXRING(nifp, d->first_rx_ring);
1005 if ((void *)r == (void *)nifp) {
1006 /* the descriptor is open for TX only */
1007 r = NETMAP_TXRING(nifp, d->first_tx_ring);
1010 *(struct netmap_if **)(uintptr_t)&(d->nifp) = nifp;
1011 *(struct netmap_ring **)(uintptr_t)&d->some_ring = r;
1012 *(void **)(uintptr_t)&d->buf_start = NETMAP_BUF(r, 0);
1013 *(void **)(uintptr_t)&d->buf_end =
1014 (char *)d->mem + d->memsize;
1024 * Same prototype as pcap_inject(), only need to cast.
1027 nm_inject(struct nm_desc *d, const void *buf, size_t size)
1029 u_int c, n = d->last_tx_ring - d->first_tx_ring + 1,
1030 ri = d->cur_tx_ring;
1032 for (c = 0; c < n ; c++, ri++) {
1033 /* compute current ring to use */
1034 struct netmap_ring *ring;
1038 if (ri > d->last_tx_ring)
1039 ri = d->first_tx_ring;
1040 ring = NETMAP_TXRING(d->nifp, ri);
1043 while (rem > ring->nr_buf_size && j != ring->tail) {
1044 rem -= ring->nr_buf_size;
1045 j = nm_ring_next(ring, j);
1047 if (j == ring->tail && rem > 0)
1051 idx = ring->slot[i].buf_idx;
1052 ring->slot[i].len = ring->nr_buf_size;
1053 ring->slot[i].flags = NS_MOREFRAG;
1054 nm_pkt_copy(buf, NETMAP_BUF(ring, idx), ring->nr_buf_size);
1055 i = nm_ring_next(ring, i);
1056 buf = (char *)buf + ring->nr_buf_size;
1058 idx = ring->slot[i].buf_idx;
1059 ring->slot[i].len = rem;
1060 ring->slot[i].flags = 0;
1061 nm_pkt_copy(buf, NETMAP_BUF(ring, idx), rem);
1062 ring->head = ring->cur = nm_ring_next(ring, i);
1063 d->cur_tx_ring = ri;
1066 return 0; /* fail */
1071 * Same prototype as pcap_dispatch(), only need to cast.
1074 nm_dispatch(struct nm_desc *d, int cnt, nm_cb_t cb, u_char *arg)
1076 int n = d->last_rx_ring - d->first_rx_ring + 1;
1077 int c, got = 0, ri = d->cur_rx_ring;
1079 d->hdr.flags = NM_MORE_PKTS;
1084 /* cnt == -1 means infinite, but rings have a finite amount
1085 * of buffers and the int is large enough that we never wrap,
1086 * so we can omit checking for -1
1088 for (c=0; c < n && cnt != got; c++, ri++) {
1089 /* compute current ring to use */
1090 struct netmap_ring *ring;
1092 if (ri > d->last_rx_ring)
1093 ri = d->first_rx_ring;
1094 ring = NETMAP_RXRING(d->nifp, ri);
1095 for ( ; !nm_ring_empty(ring) && cnt != got; got++) {
1098 struct netmap_slot *slot;
1099 if (d->hdr.buf) { /* from previous round */
1100 cb(arg, &d->hdr, d->hdr.buf);
1103 slot = &ring->slot[i];
1104 idx = slot->buf_idx;
1105 /* d->cur_rx_ring doesn't change inside this loop, but
1106 * set it here, so it reflects d->hdr.buf's ring */
1107 d->cur_rx_ring = ri;
1109 oldbuf = d->hdr.buf = (u_char *)NETMAP_BUF(ring, idx);
1110 // __builtin_prefetch(buf);
1111 d->hdr.len = d->hdr.caplen = slot->len;
1112 while (slot->flags & NS_MOREFRAG) {
1114 u_int oldlen = slot->len;
1115 i = nm_ring_next(ring, i);
1116 slot = &ring->slot[i];
1117 d->hdr.len += slot->len;
1118 nbuf = (u_char *)NETMAP_BUF(ring, slot->buf_idx);
1119 if (oldbuf != NULL && nbuf - oldbuf == ring->nr_buf_size &&
1120 oldlen == ring->nr_buf_size) {
1121 d->hdr.caplen += slot->len;
1127 d->hdr.ts = ring->ts;
1128 ring->head = ring->cur = nm_ring_next(ring, i);
1131 if (d->hdr.buf) { /* from previous round */
1133 cb(arg, &d->hdr, d->hdr.buf);
1139 nm_nextpkt(struct nm_desc *d, struct nm_pkthdr *hdr)
1141 int ri = d->cur_rx_ring;
1144 /* compute current ring to use */
1145 struct netmap_ring *ring = NETMAP_RXRING(d->nifp, ri);
1146 if (!nm_ring_empty(ring)) {
1147 u_int i = ring->cur;
1148 u_int idx = ring->slot[i].buf_idx;
1149 u_char *buf = (u_char *)NETMAP_BUF(ring, idx);
1151 // __builtin_prefetch(buf);
1153 hdr->len = hdr->caplen = ring->slot[i].len;
1154 ring->cur = nm_ring_next(ring, i);
1155 /* we could postpone advancing head if we want
1156 * to hold the buffer. This can be supported in
1159 ring->head = ring->cur;
1160 d->cur_rx_ring = ri;
1164 if (ri > d->last_rx_ring)
1165 ri = d->first_rx_ring;
1166 } while (ri != d->cur_rx_ring);
1167 return NULL; /* nothing found */
1170 #endif /* !HAVE_NETMAP_WITH_LIBS */
1172 #endif /* NETMAP_WITH_LIBS */
1174 #endif /* _NET_NETMAP_USER_H_ */