2 * Copyright (C) 2011-2016 Universita` di Pisa
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
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22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * Functions and macros to manipulate netmap structures and packets
32 * in userspace. See netmap(4) for more information.
34 * The address of the struct netmap_if, say nifp, is computed from the
35 * value returned from ioctl(.., NIOCREG, ...) and the mmap region:
36 * ioctl(fd, NIOCREG, &req);
37 * mem = mmap(0, ... );
38 * nifp = NETMAP_IF(mem, req.nr_nifp);
39 * (so simple, we could just do it manually)
42 * struct netmap_ring *NETMAP_TXRING(nifp, index)
43 * struct netmap_ring *NETMAP_RXRING(nifp, index)
44 * we can access ring->cur, ring->head, ring->tail, etc.
46 * ring->slot[i] gives us the i-th slot (we can access
47 * directly len, flags, buf_idx)
49 * char *buf = NETMAP_BUF(ring, x) returns a pointer to
50 * the buffer numbered x
52 * All ring indexes (head, cur, tail) should always move forward.
53 * To compute the next index in a circular ring you can use
54 * i = nm_ring_next(ring, i);
56 * To ease porting apps from pcap to netmap we supply a few fuctions
57 * that can be called to open, close, read and write on netmap in a way
58 * similar to libpcap. Note that the read/write function depend on
59 * an ioctl()/select()/poll() being issued to refill rings or push
62 * In order to use these, include #define NETMAP_WITH_LIBS
63 * in the source file that invokes these functions.
66 #ifndef _NET_NETMAP_USER_H_
67 #define _NET_NETMAP_USER_H_
69 #define NETMAP_DEVICE_NAME "/dev/netmap"
73 * we can compile userspace apps with either cygwin or msvc,
74 * and we use _WIN32 to identify windows specific code
80 #endif /* __CYGWIN__ */
83 #undef NETMAP_DEVICE_NAME
84 #define NETMAP_DEVICE_NAME "/proc/sys/DosDevices/Global/netmap"
87 #include <sys/cygwin.h>
91 #include <sys/socket.h> /* apple needs sockaddr */
92 #include <net/if.h> /* IFNAMSIZ */
96 #define likely(x) __builtin_expect(!!(x), 1)
97 #define unlikely(x) __builtin_expect(!!(x), 0)
98 #endif /* likely and unlikely */
100 #include <net/netmap.h>
103 #define _NETMAP_OFFSET(type, ptr, offset) \
104 ((type)(void *)((char *)(ptr) + (offset)))
106 #define NETMAP_IF(_base, _ofs) _NETMAP_OFFSET(struct netmap_if *, _base, _ofs)
108 #define NETMAP_TXRING(nifp, index) _NETMAP_OFFSET(struct netmap_ring *, \
109 nifp, (nifp)->ring_ofs[index] )
111 #define NETMAP_RXRING(nifp, index) _NETMAP_OFFSET(struct netmap_ring *, \
112 nifp, (nifp)->ring_ofs[index + (nifp)->ni_tx_rings + 1] )
114 #define NETMAP_BUF(ring, index) \
115 ((char *)(ring) + (ring)->buf_ofs + ((index)*(ring)->nr_buf_size))
117 #define NETMAP_BUF_IDX(ring, buf) \
118 ( ((char *)(buf) - ((char *)(ring) + (ring)->buf_ofs) ) / \
119 (ring)->nr_buf_size )
122 static inline uint32_t
123 nm_ring_next(struct netmap_ring *r, uint32_t i)
125 return ( unlikely(i + 1 == r->num_slots) ? 0 : i + 1);
130 * Return 1 if we have pending transmissions in the tx ring.
131 * When everything is complete ring->head = ring->tail + 1 (modulo ring size)
134 nm_tx_pending(struct netmap_ring *r)
136 return nm_ring_next(r, r->tail) != r->head;
139 /* Compute the number of slots available in the netmap ring. We use
140 * ring->head as explained in the comment above nm_ring_empty(). */
141 static inline uint32_t
142 nm_ring_space(struct netmap_ring *ring)
144 int ret = ring->tail - ring->head;
146 ret += ring->num_slots;
151 #ifdef NETMAP_WITH_LIBS
153 * Support for simple I/O libraries.
154 * Include other system headers required for compiling this.
157 #ifndef HAVE_NETMAP_WITH_LIBS
158 #define HAVE_NETMAP_WITH_LIBS
161 #include <sys/time.h>
162 #include <sys/mman.h>
163 #include <string.h> /* memset */
164 #include <sys/ioctl.h>
165 #include <sys/errno.h> /* EINVAL */
166 #include <fcntl.h> /* O_RDWR */
167 #include <unistd.h> /* close() */
171 #ifndef ND /* debug macros */
173 #define ND(_fmt, ...) do {} while(0)
174 #define D(_fmt, ...) \
176 struct timeval _t0; \
177 gettimeofday(&_t0, NULL); \
178 fprintf(stderr, "%03d.%06d %s [%d] " _fmt "\n", \
179 (int)(_t0.tv_sec % 1000), (int)_t0.tv_usec, \
180 __FUNCTION__, __LINE__, ##__VA_ARGS__); \
183 /* Rate limited version of "D", lps indicates how many per second */
184 #define RD(lps, format, ...) \
186 static int __t0, __cnt; \
187 struct timeval __xxts; \
188 gettimeofday(&__xxts, NULL); \
189 if (__t0 != __xxts.tv_sec) { \
190 __t0 = __xxts.tv_sec; \
193 if (__cnt++ < lps) { \
194 D(format, ##__VA_ARGS__); \
199 struct nm_pkthdr { /* first part is the same as pcap_pkthdr */
204 uint64_t flags; /* NM_MORE_PKTS etc */
205 #define NM_MORE_PKTS 1
207 struct netmap_slot *slot;
211 struct nm_stat { /* same as pcap_stat */
215 #ifdef WIN32 /* XXX or _WIN32 ? */
220 #define NM_ERRBUF_SIZE 512
223 struct nm_desc *self; /* point to self if netmap. */
227 int done_mmap; /* set if mem is the result of mmap */
228 struct netmap_if * const nifp;
229 uint16_t first_tx_ring, last_tx_ring, cur_tx_ring;
230 uint16_t first_rx_ring, last_rx_ring, cur_rx_ring;
231 struct nmreq req; /* also contains the nr_name = ifname */
232 struct nm_pkthdr hdr;
235 * The memory contains netmap_if, rings and then buffers.
236 * Given a pointer (e.g. to nm_inject) we can compare with
237 * mem/buf_start/buf_end to tell if it is a buffer or
238 * some other descriptor in our region.
239 * We also store a pointer to some ring as it helps in the
240 * translation from buffer indexes to addresses.
242 struct netmap_ring * const some_ring;
243 void * const buf_start;
244 void * const buf_end;
245 /* parameters from pcap_open_live */
251 /* save flags so we can restore them on close */
257 char msg[NM_ERRBUF_SIZE];
261 * when the descriptor is open correctly, d->self == d
262 * Eventually we should also use some magic number.
264 #define P2NMD(p) ((struct nm_desc *)(p))
265 #define IS_NETMAP_DESC(d) ((d) && P2NMD(d)->self == P2NMD(d))
266 #define NETMAP_FD(d) (P2NMD(d)->fd)
270 * this is a slightly optimized copy routine which rounds
271 * to multiple of 64 bytes and is often faster than dealing
272 * with other odd sizes. We assume there is enough room
273 * in the source and destination buffers.
276 nm_pkt_copy(const void *_src, void *_dst, int l)
278 const uint64_t *src = (const uint64_t *)_src;
279 uint64_t *dst = (uint64_t *)_dst;
281 if (unlikely(l >= 1024 || l % 64)) {
285 for (; likely(l > 0); l-=64) {
299 * The callback, invoked on each received packet. Same as libpcap
301 typedef void (*nm_cb_t)(u_char *, const struct nm_pkthdr *, const u_char *d);
304 *--- the pcap-like API ---
306 * nm_open() opens a file descriptor, binds to a port and maps memory.
308 * ifname (netmap:foo or vale:foo) is the port name
309 * a suffix can indicate the follwing:
310 * ^ bind the host (sw) ring pair
311 * * bind host and NIC ring pairs
312 * -NN bind individual NIC ring pair
313 * {NN bind master side of pipe NN
314 * }NN bind slave side of pipe NN
315 * a suffix starting with / and the following flags,
318 * z zero copy monitor (both tx and rx)
319 * t monitor tx side (copy monitor)
320 * r monitor rx side (copy monitor)
321 * R bind only RX ring(s)
322 * T bind only TX ring(s)
324 * req provides the initial values of nmreq before parsing ifname.
325 * Remember that the ifname parsing will override the ring
326 * number in nm_ringid, and part of nm_flags;
327 * flags special functions, normally 0
328 * indicates which fields of *arg are significant
329 * arg special functions, normally NULL
330 * if passed a netmap_desc with mem != NULL,
331 * use that memory instead of mmap.
334 static struct nm_desc *nm_open(const char *ifname, const struct nmreq *req,
335 uint64_t flags, const struct nm_desc *arg);
338 * nm_open can import some fields from the parent descriptor.
339 * These flags control which ones.
340 * Also in flags you can specify NETMAP_NO_TX_POLL and NETMAP_DO_RX_POLL,
341 * which set the initial value for these flags.
342 * Note that the 16 low bits of the flags are reserved for data
343 * that may go into the nmreq.
346 NM_OPEN_NO_MMAP = 0x040000, /* reuse mmap from parent */
347 NM_OPEN_IFNAME = 0x080000, /* nr_name, nr_ringid, nr_flags */
348 NM_OPEN_ARG1 = 0x100000,
349 NM_OPEN_ARG2 = 0x200000,
350 NM_OPEN_ARG3 = 0x400000,
351 NM_OPEN_RING_CFG = 0x800000, /* tx|rx rings|slots */
356 * nm_close() closes and restores the port to its previous state
359 static int nm_close(struct nm_desc *);
362 * nm_mmap() do mmap or inherit from parent if the nr_arg2
363 * (memory block) matches.
366 static int nm_mmap(struct nm_desc *, const struct nm_desc *);
369 * nm_inject() is the same as pcap_inject()
370 * nm_dispatch() is the same as pcap_dispatch()
371 * nm_nextpkt() is the same as pcap_next()
374 static int nm_inject(struct nm_desc *, const void *, size_t);
375 static int nm_dispatch(struct nm_desc *, int, nm_cb_t, u_char *);
376 static u_char *nm_nextpkt(struct nm_desc *, struct nm_pkthdr *);
380 intptr_t _get_osfhandle(int); /* defined in io.h in windows */
383 * In windows we do not have yet native poll support, so we keep track
384 * of file descriptors associated to netmap ports to emulate poll on
385 * them and fall back on regular poll on other file descriptors.
387 struct win_netmap_fd_list {
388 struct win_netmap_fd_list *next;
390 HANDLE win_netmap_handle;
394 * list head containing all the netmap opened fd and their
395 * windows HANDLE counterparts
397 static struct win_netmap_fd_list *win_netmap_fd_list_head;
400 win_insert_fd_record(int fd)
402 struct win_netmap_fd_list *curr;
404 for (curr = win_netmap_fd_list_head; curr; curr = curr->next) {
405 if (fd == curr->win_netmap_fd) {
409 curr = calloc(1, sizeof(*curr));
410 curr->next = win_netmap_fd_list_head;
411 curr->win_netmap_fd = fd;
412 curr->win_netmap_handle = IntToPtr(_get_osfhandle(fd));
413 win_netmap_fd_list_head = curr;
417 win_remove_fd_record(int fd)
419 struct win_netmap_fd_list *curr = win_netmap_fd_list_head;
420 struct win_netmap_fd_list *prev = NULL;
421 for (; curr ; prev = curr, curr = curr->next) {
422 if (fd != curr->win_netmap_fd)
424 /* found the entry */
425 if (prev == NULL) { /* we are freeing the first entry */
426 win_netmap_fd_list_head = curr->next;
428 prev->next = curr->next;
437 win_get_netmap_handle(int fd)
439 struct win_netmap_fd_list *curr;
441 for (curr = win_netmap_fd_list_head; curr; curr = curr->next) {
442 if (fd == curr->win_netmap_fd) {
443 return curr->win_netmap_handle;
450 * we need to wrap ioctl and mmap, at least for the netmap file descriptors
454 * use this function only from netmap_user.h internal functions
455 * same as ioctl, returns 0 on success and -1 on error
458 win_nm_ioctl_internal(HANDLE h, int32_t ctlCode, void *arg)
460 DWORD bReturn = 0, szIn, szOut;
461 BOOL ioctlReturnStatus;
462 void *inParam = arg, *outParam = arg;
466 szIn = sizeof(POLL_REQUEST_DATA);
467 szOut = sizeof(POLL_REQUEST_DATA);
471 szOut = sizeof(void*);
472 inParam = NULL; /* nothing on input */
480 szIn = sizeof(struct nmreq);
481 szOut = sizeof(struct nmreq);
484 D("unsupported NIOCCONFIG!");
487 default: /* a regular ioctl */
488 D("invalid ioctl %x on netmap fd", ctlCode);
492 ioctlReturnStatus = DeviceIoControl(h,
493 ctlCode, inParam, szIn,
496 // XXX note windows returns 0 on error or async call, 1 on success
497 // we could call GetLastError() to figure out what happened
498 return ioctlReturnStatus ? 0 : -1;
502 * this function is what must be called from user-space programs
503 * same as ioctl, returns 0 on success and -1 on error
506 win_nm_ioctl(int fd, int32_t ctlCode, void *arg)
508 HANDLE h = win_get_netmap_handle(fd);
511 return ioctl(fd, ctlCode, arg);
513 return win_nm_ioctl_internal(h, ctlCode, arg);
517 #define ioctl win_nm_ioctl /* from now on, within this file ... */
520 * We cannot use the native mmap on windows
521 * The only parameter used is "fd", the other ones are just declared to
522 * make this signature comparable to the FreeBSD/Linux one
525 win32_mmap_emulated(void *addr, size_t length, int prot, int flags, int fd, int32_t offset)
527 HANDLE h = win_get_netmap_handle(fd);
530 return mmap(addr, length, prot, flags, fd, offset);
534 return win_nm_ioctl_internal(h, NETMAP_MMAP, &ret) ?
535 NULL : ret.pUsermodeVirtualAddress;
539 #define mmap win32_mmap_emulated
541 #include <sys/poll.h> /* XXX needed to use the structure pollfd */
544 win_nm_poll(struct pollfd *fds, int nfds, int timeout)
548 if (nfds != 1 || fds == NULL || (h = win_get_netmap_handle(fds->fd)) == NULL) {;
549 return poll(fds, nfds, timeout);
551 POLL_REQUEST_DATA prd;
553 prd.timeout = timeout;
554 prd.events = fds->events;
556 win_nm_ioctl_internal(h, NETMAP_POLL, &prd);
557 if ((prd.revents == POLLERR) || (prd.revents == STATUS_TIMEOUT)) {
564 #define poll win_nm_poll
567 win_nm_open(char* pathname, int flags)
570 if (strcmp(pathname, NETMAP_DEVICE_NAME) == 0) {
571 int fd = open(NETMAP_DEVICE_NAME, O_RDWR);
576 win_insert_fd_record(fd);
579 return open(pathname, flags);
583 #define open win_nm_open
590 if (win_get_netmap_handle(fd) != NULL) {
591 win_remove_fd_record(fd);
597 #define close win_nm_close
602 nm_is_identifier(const char *s, const char *e)
604 for (; s != e; s++) {
605 if (!isalnum(*s) && *s != '_') {
615 nm_parse(const char *ifname, struct nm_desc *d, char *err)
618 const char *port = NULL;
619 const char *vpname = NULL;
621 uint32_t nr_ringid = 0, nr_flags;
622 char errmsg[MAXERRMSG] = "";
624 uint16_t nr_arg2 = 0;
625 enum { P_START, P_RNGSFXOK, P_GETNUM, P_FLAGS, P_FLAGSOK, P_MEMID } p_state;
629 is_vale = (ifname[0] == 'v');
631 port = index(ifname, ':');
633 snprintf(errmsg, MAXERRMSG,
634 "missing ':' in vale name");
638 if (!nm_is_identifier(ifname + 4, port)) {
639 snprintf(errmsg, MAXERRMSG, "invalid bridge name");
649 /* scan for a separator */
650 for (; *port && !index("-*^{}/@", *port); port++)
653 if (is_vale && !nm_is_identifier(vpname, port)) {
654 snprintf(errmsg, MAXERRMSG, "invalid bridge port name");
658 namelen = port - ifname;
659 if (namelen >= sizeof(d->req.nr_name)) {
660 snprintf(errmsg, MAXERRMSG, "name too long");
663 memcpy(d->req.nr_name, ifname, namelen);
664 d->req.nr_name[namelen] = '\0';
667 nr_flags = NR_REG_ALL_NIC; /* default for no suffix */
672 case '^': /* only SW ring */
673 nr_flags = NR_REG_SW;
674 p_state = P_RNGSFXOK;
676 case '*': /* NIC and SW */
677 nr_flags = NR_REG_NIC_SW;
678 p_state = P_RNGSFXOK;
680 case '-': /* one NIC ring pair */
681 nr_flags = NR_REG_ONE_NIC;
684 case '{': /* pipe (master endpoint) */
685 nr_flags = NR_REG_PIPE_MASTER;
688 case '}': /* pipe (slave endoint) */
689 nr_flags = NR_REG_PIPE_SLAVE;
692 case '/': /* start of flags */
695 case '@': /* start of memid */
699 snprintf(errmsg, MAXERRMSG, "unknown modifier: '%c'", *port);
713 snprintf(errmsg, MAXERRMSG, "unexpected character: '%c'", *port);
719 num = strtol(port, (char **)&port, 10);
720 if (num < 0 || num >= NETMAP_RING_MASK) {
721 snprintf(errmsg, MAXERRMSG, "'%ld' out of range [0, %d)",
722 num, NETMAP_RING_MASK);
725 nr_ringid = num & NETMAP_RING_MASK;
726 p_state = P_RNGSFXOK;
737 nr_flags |= NR_EXCLUSIVE;
740 nr_flags |= NR_ZCOPY_MON;
743 nr_flags |= NR_MONITOR_TX;
746 nr_flags |= NR_MONITOR_RX;
749 nr_flags |= NR_RX_RINGS_ONLY;
752 nr_flags |= NR_TX_RINGS_ONLY;
755 snprintf(errmsg, MAXERRMSG, "unrecognized flag: '%c'", *port);
763 snprintf(errmsg, MAXERRMSG, "double setting of memid");
766 num = strtol(port, (char **)&port, 10);
768 snprintf(errmsg, MAXERRMSG, "invalid memid %ld, must be >0", num);
772 p_state = P_RNGSFXOK;
776 if (p_state != P_START && p_state != P_RNGSFXOK && p_state != P_FLAGSOK) {
777 snprintf(errmsg, MAXERRMSG, "unexpected end of port name");
780 ND("flags: %s %s %s %s",
781 (nr_flags & NR_EXCLUSIVE) ? "EXCLUSIVE" : "",
782 (nr_flags & NR_ZCOPY_MON) ? "ZCOPY_MON" : "",
783 (nr_flags & NR_MONITOR_TX) ? "MONITOR_TX" : "",
784 (nr_flags & NR_MONITOR_RX) ? "MONITOR_RX" : "");
786 d->req.nr_flags |= nr_flags;
787 d->req.nr_ringid |= nr_ringid;
788 d->req.nr_arg2 = nr_arg2;
797 strncpy(err, errmsg, MAXERRMSG);
802 * Try to open, return descriptor if successful, NULL otherwise.
803 * An invalid netmap name will return errno = 0;
804 * You can pass a pointer to a pre-filled nm_desc to add special
805 * parameters. Flags is used as follows
806 * NM_OPEN_NO_MMAP use the memory from arg, only XXX avoid mmap
807 * if the nr_arg2 (memory block) matches.
808 * NM_OPEN_ARG1 use req.nr_arg1 from arg
809 * NM_OPEN_ARG2 use req.nr_arg2 from arg
810 * NM_OPEN_RING_CFG user ring config from arg
812 static struct nm_desc *
813 nm_open(const char *ifname, const struct nmreq *req,
814 uint64_t new_flags, const struct nm_desc *arg)
816 struct nm_desc *d = NULL;
817 const struct nm_desc *parent = arg;
818 char errmsg[MAXERRMSG] = "";
821 if (strncmp(ifname, "netmap:", 7) &&
822 strncmp(ifname, NM_BDG_NAME, strlen(NM_BDG_NAME))) {
823 errno = 0; /* name not recognised, not an error */
827 d = (struct nm_desc *)calloc(1, sizeof(*d));
829 snprintf(errmsg, MAXERRMSG, "nm_desc alloc failure");
833 d->self = d; /* set this early so nm_close() works */
834 d->fd = open(NETMAP_DEVICE_NAME, O_RDWR);
836 snprintf(errmsg, MAXERRMSG, "cannot open /dev/netmap: %s", strerror(errno));
843 if (!(new_flags & NM_OPEN_IFNAME)) {
844 if (nm_parse(ifname, d, errmsg) < 0)
848 d->req.nr_version = NETMAP_API;
849 d->req.nr_ringid &= NETMAP_RING_MASK;
851 /* optionally import info from parent */
852 if (IS_NETMAP_DESC(parent) && new_flags) {
853 if (new_flags & NM_OPEN_ARG1)
854 D("overriding ARG1 %d", parent->req.nr_arg1);
855 d->req.nr_arg1 = new_flags & NM_OPEN_ARG1 ?
856 parent->req.nr_arg1 : 4;
857 if (new_flags & NM_OPEN_ARG2) {
858 D("overriding ARG2 %d", parent->req.nr_arg2);
859 d->req.nr_arg2 = parent->req.nr_arg2;
861 if (new_flags & NM_OPEN_ARG3)
862 D("overriding ARG3 %d", parent->req.nr_arg3);
863 d->req.nr_arg3 = new_flags & NM_OPEN_ARG3 ?
864 parent->req.nr_arg3 : 0;
865 if (new_flags & NM_OPEN_RING_CFG) {
866 D("overriding RING_CFG");
867 d->req.nr_tx_slots = parent->req.nr_tx_slots;
868 d->req.nr_rx_slots = parent->req.nr_rx_slots;
869 d->req.nr_tx_rings = parent->req.nr_tx_rings;
870 d->req.nr_rx_rings = parent->req.nr_rx_rings;
872 if (new_flags & NM_OPEN_IFNAME) {
873 D("overriding ifname %s ringid 0x%x flags 0x%x",
874 parent->req.nr_name, parent->req.nr_ringid,
875 parent->req.nr_flags);
876 memcpy(d->req.nr_name, parent->req.nr_name,
877 sizeof(d->req.nr_name));
878 d->req.nr_ringid = parent->req.nr_ringid;
879 d->req.nr_flags = parent->req.nr_flags;
882 /* add the *XPOLL flags */
883 d->req.nr_ringid |= new_flags & (NETMAP_NO_TX_POLL | NETMAP_DO_RX_POLL);
885 if (ioctl(d->fd, NIOCREGIF, &d->req)) {
886 snprintf(errmsg, MAXERRMSG, "NIOCREGIF failed: %s", strerror(errno));
890 nr_reg = d->req.nr_flags & NR_REG_MASK;
892 if (nr_reg == NR_REG_SW) { /* host stack */
893 d->first_tx_ring = d->last_tx_ring = d->req.nr_tx_rings;
894 d->first_rx_ring = d->last_rx_ring = d->req.nr_rx_rings;
895 } else if (nr_reg == NR_REG_ALL_NIC) { /* only nic */
896 d->first_tx_ring = 0;
897 d->first_rx_ring = 0;
898 d->last_tx_ring = d->req.nr_tx_rings - 1;
899 d->last_rx_ring = d->req.nr_rx_rings - 1;
900 } else if (nr_reg == NR_REG_NIC_SW) {
901 d->first_tx_ring = 0;
902 d->first_rx_ring = 0;
903 d->last_tx_ring = d->req.nr_tx_rings;
904 d->last_rx_ring = d->req.nr_rx_rings;
905 } else if (nr_reg == NR_REG_ONE_NIC) {
906 /* XXX check validity */
907 d->first_tx_ring = d->last_tx_ring =
908 d->first_rx_ring = d->last_rx_ring = d->req.nr_ringid & NETMAP_RING_MASK;
910 d->first_tx_ring = d->last_tx_ring = 0;
911 d->first_rx_ring = d->last_rx_ring = 0;
914 /* if parent is defined, do nm_mmap() even if NM_OPEN_NO_MMAP is set */
915 if ((!(new_flags & NM_OPEN_NO_MMAP) || parent) && nm_mmap(d, parent)) {
916 snprintf(errmsg, MAXERRMSG, "mmap failed: %s", strerror(errno));
921 #ifdef DEBUG_NETMAP_USER
922 { /* debugging code */
925 D("%s tx %d .. %d %d rx %d .. %d %d", ifname,
926 d->first_tx_ring, d->last_tx_ring, d->req.nr_tx_rings,
927 d->first_rx_ring, d->last_rx_ring, d->req.nr_rx_rings);
928 for (i = 0; i <= d->req.nr_tx_rings; i++) {
929 struct netmap_ring *r = NETMAP_TXRING(d->nifp, i);
930 D("TX%d %p h %d c %d t %d", i, r, r->head, r->cur, r->tail);
932 for (i = 0; i <= d->req.nr_rx_rings; i++) {
933 struct netmap_ring *r = NETMAP_RXRING(d->nifp, i);
934 D("RX%d %p h %d c %d t %d", i, r, r->head, r->cur, r->tail);
937 #endif /* debugging */
939 d->cur_tx_ring = d->first_tx_ring;
940 d->cur_rx_ring = d->first_rx_ring;
946 D("%s %s", errmsg, ifname);
954 nm_close(struct nm_desc *d)
957 * ugly trick to avoid unused warnings
959 static void *__xxzt[] __attribute__ ((unused)) =
960 { (void *)nm_open, (void *)nm_inject,
961 (void *)nm_dispatch, (void *)nm_nextpkt } ;
963 if (d == NULL || d->self != d)
965 if (d->done_mmap && d->mem)
966 munmap(d->mem, d->memsize);
971 bzero(d, sizeof(*d));
978 nm_mmap(struct nm_desc *d, const struct nm_desc *parent)
980 //XXX TODO: check if mmap is already done
982 if (IS_NETMAP_DESC(parent) && parent->mem &&
983 parent->req.nr_arg2 == d->req.nr_arg2) {
984 /* do not mmap, inherit from parent */
985 D("do not mmap, inherit from parent");
986 d->memsize = parent->memsize;
987 d->mem = parent->mem;
989 /* XXX TODO: check if memsize is too large (or there is overflow) */
990 d->memsize = d->req.nr_memsize;
991 d->mem = mmap(0, d->memsize, PROT_WRITE | PROT_READ, MAP_SHARED,
993 if (d->mem == MAP_FAILED) {
999 struct netmap_if *nifp = NETMAP_IF(d->mem, d->req.nr_offset);
1000 struct netmap_ring *r = NETMAP_RXRING(nifp, d->first_rx_ring);
1001 if ((void *)r == (void *)nifp) {
1002 /* the descriptor is open for TX only */
1003 r = NETMAP_TXRING(nifp, d->first_tx_ring);
1006 *(struct netmap_if **)(uintptr_t)&(d->nifp) = nifp;
1007 *(struct netmap_ring **)(uintptr_t)&d->some_ring = r;
1008 *(void **)(uintptr_t)&d->buf_start = NETMAP_BUF(r, 0);
1009 *(void **)(uintptr_t)&d->buf_end =
1010 (char *)d->mem + d->memsize;
1020 * Same prototype as pcap_inject(), only need to cast.
1023 nm_inject(struct nm_desc *d, const void *buf, size_t size)
1025 u_int c, n = d->last_tx_ring - d->first_tx_ring + 1,
1026 ri = d->cur_tx_ring;
1028 for (c = 0; c < n ; c++, ri++) {
1029 /* compute current ring to use */
1030 struct netmap_ring *ring;
1034 if (ri > d->last_tx_ring)
1035 ri = d->first_tx_ring;
1036 ring = NETMAP_TXRING(d->nifp, ri);
1039 while (rem > ring->nr_buf_size && j != ring->tail) {
1040 rem -= ring->nr_buf_size;
1041 j = nm_ring_next(ring, j);
1043 if (j == ring->tail && rem > 0)
1047 idx = ring->slot[i].buf_idx;
1048 ring->slot[i].len = ring->nr_buf_size;
1049 ring->slot[i].flags = NS_MOREFRAG;
1050 nm_pkt_copy(buf, NETMAP_BUF(ring, idx), ring->nr_buf_size);
1051 i = nm_ring_next(ring, i);
1052 buf = (char *)buf + ring->nr_buf_size;
1054 idx = ring->slot[i].buf_idx;
1055 ring->slot[i].len = rem;
1056 ring->slot[i].flags = 0;
1057 nm_pkt_copy(buf, NETMAP_BUF(ring, idx), rem);
1058 ring->head = ring->cur = nm_ring_next(ring, i);
1059 d->cur_tx_ring = ri;
1062 return 0; /* fail */
1067 * Same prototype as pcap_dispatch(), only need to cast.
1070 nm_dispatch(struct nm_desc *d, int cnt, nm_cb_t cb, u_char *arg)
1072 int n = d->last_rx_ring - d->first_rx_ring + 1;
1073 int c, got = 0, ri = d->cur_rx_ring;
1075 d->hdr.flags = NM_MORE_PKTS;
1080 /* cnt == -1 means infinite, but rings have a finite amount
1081 * of buffers and the int is large enough that we never wrap,
1082 * so we can omit checking for -1
1084 for (c=0; c < n && cnt != got; c++, ri++) {
1085 /* compute current ring to use */
1086 struct netmap_ring *ring;
1088 if (ri > d->last_rx_ring)
1089 ri = d->first_rx_ring;
1090 ring = NETMAP_RXRING(d->nifp, ri);
1091 for ( ; !nm_ring_empty(ring) && cnt != got; got++) {
1094 struct netmap_slot *slot;
1095 if (d->hdr.buf) { /* from previous round */
1096 cb(arg, &d->hdr, d->hdr.buf);
1099 slot = &ring->slot[i];
1100 idx = slot->buf_idx;
1101 /* d->cur_rx_ring doesn't change inside this loop, but
1102 * set it here, so it reflects d->hdr.buf's ring */
1103 d->cur_rx_ring = ri;
1105 oldbuf = d->hdr.buf = (u_char *)NETMAP_BUF(ring, idx);
1106 // __builtin_prefetch(buf);
1107 d->hdr.len = d->hdr.caplen = slot->len;
1108 while (slot->flags & NS_MOREFRAG) {
1110 u_int oldlen = slot->len;
1111 i = nm_ring_next(ring, i);
1112 slot = &ring->slot[i];
1113 d->hdr.len += slot->len;
1114 nbuf = (u_char *)NETMAP_BUF(ring, slot->buf_idx);
1115 if (oldbuf != NULL && nbuf - oldbuf == ring->nr_buf_size &&
1116 oldlen == ring->nr_buf_size) {
1117 d->hdr.caplen += slot->len;
1123 d->hdr.ts = ring->ts;
1124 ring->head = ring->cur = nm_ring_next(ring, i);
1127 if (d->hdr.buf) { /* from previous round */
1129 cb(arg, &d->hdr, d->hdr.buf);
1135 nm_nextpkt(struct nm_desc *d, struct nm_pkthdr *hdr)
1137 int ri = d->cur_rx_ring;
1140 /* compute current ring to use */
1141 struct netmap_ring *ring = NETMAP_RXRING(d->nifp, ri);
1142 if (!nm_ring_empty(ring)) {
1143 u_int i = ring->cur;
1144 u_int idx = ring->slot[i].buf_idx;
1145 u_char *buf = (u_char *)NETMAP_BUF(ring, idx);
1147 // __builtin_prefetch(buf);
1149 hdr->len = hdr->caplen = ring->slot[i].len;
1150 ring->cur = nm_ring_next(ring, i);
1151 /* we could postpone advancing head if we want
1152 * to hold the buffer. This can be supported in
1155 ring->head = ring->cur;
1156 d->cur_rx_ring = ri;
1160 if (ri > d->last_rx_ring)
1161 ri = d->first_rx_ring;
1162 } while (ri != d->cur_rx_ring);
1163 return NULL; /* nothing found */
1166 #endif /* !HAVE_NETMAP_WITH_LIBS */
1168 #endif /* NETMAP_WITH_LIBS */
1170 #endif /* _NET_NETMAP_USER_H_ */