2 * Copyright (c) 2008, 2009 Nicira Networks.
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at:
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
26 #include <linux/rtnetlink.h>
27 #include <linux/ethtool.h>
28 #include <linux/sockios.h>
29 #include <netinet/in.h>
32 #include <sys/ioctl.h>
34 #include <sys/sysmacros.h>
38 #include "dynamic-string.h"
42 #include "ofp-print.h"
45 #include "poll-loop.h"
50 #define THIS_MODULE VLM_dpif
52 /* Rate limit for individual messages going to or from the datapath, output at
53 * DBG level. This is very high because, if these are enabled, it is because
54 * we really need to see them. */
55 static struct vlog_rate_limit dpmsg_rl = VLOG_RATE_LIMIT_INIT(600, 600);
57 /* Not really much point in logging many dpif errors. */
58 static struct vlog_rate_limit error_rl = VLOG_RATE_LIMIT_INIT(9999, 5);
60 static int get_minor_from_name(const char *name, unsigned int *minor);
61 static int name_to_minor(const char *name, unsigned int *minor);
62 static int lookup_minor(const char *name, unsigned int *minor);
63 static int open_by_minor(unsigned int minor, struct dpif *);
64 static int make_openvswitch_device(unsigned int minor, char **fnp);
65 static void check_rw_odp_flow(struct odp_flow *);
68 dpif_open(const char *name, struct dpif *dpif)
75 error = name_to_minor(name, &dpif->minor);
80 error = open_by_minor(dpif->minor, dpif);
85 /* We can open the device, but that doesn't mean that it's been created.
86 * If it hasn't been, then any command other than ODP_DP_CREATE will
87 * return ENODEV. Try something innocuous. */
88 listen_mask = 0; /* Make Valgrind happy. */
89 if (ioctl(dpif->fd, ODP_GET_LISTEN_MASK, &listen_mask)) {
91 if (error != ENODEV) {
92 VLOG_WARN("%s: probe returned unexpected error: %s",
93 dpif_name(dpif), strerror(error));
102 dpif_close(struct dpif *dpif)
113 do_ioctl(const struct dpif *dpif, int cmd, const char *cmd_name,
116 int error = ioctl(dpif->fd, cmd, arg) ? errno : 0;
119 VLOG_WARN_RL(&error_rl, "%s: ioctl(%s) failed (%s)",
120 dpif_name(dpif), cmd_name, strerror(error));
122 VLOG_DBG_RL(&dpmsg_rl, "%s: ioctl(%s): success",
123 dpif_name(dpif), cmd_name);
130 dpif_create(const char *name, struct dpif *dpif)
135 if (!get_minor_from_name(name, &minor)) {
136 /* Minor was specified in 'name', go ahead and create it. */
137 error = open_by_minor(minor, dpif);
142 if (!strncmp(name, "nl:", 3)) {
144 sprintf(devname, "of%u", minor);
145 error = ioctl(dpif->fd, ODP_DP_CREATE, devname) < 0 ? errno : 0;
147 error = ioctl(dpif->fd, ODP_DP_CREATE, name) < 0 ? errno : 0;
154 for (minor = 0; minor < ODP_MAX; minor++) {
155 error = open_by_minor(minor, dpif);
160 error = ioctl(dpif->fd, ODP_DP_CREATE, name) < 0 ? errno : 0;
165 if (error != EBUSY) {
174 dpif_name(const struct dpif *dpif)
180 dpif_delete(struct dpif *dpif)
182 COVERAGE_INC(dpif_destroy);
183 return do_ioctl(dpif, ODP_DP_DESTROY, "ODP_DP_DESTROY", NULL);
187 dpif_get_dp_stats(const struct dpif *dpif, struct odp_stats *stats)
189 memset(stats, 0, sizeof *stats);
190 return do_ioctl(dpif, ODP_DP_STATS, "ODP_DP_STATS", stats);
194 dpif_get_drop_frags(const struct dpif *dpif, bool *drop_frags)
197 int error = do_ioctl(dpif, ODP_GET_DROP_FRAGS, "ODP_GET_DROP_FRAGS", &tmp);
198 *drop_frags = error ? tmp & 1 : false;
203 dpif_set_drop_frags(struct dpif *dpif, bool drop_frags)
205 int tmp = drop_frags;
206 return do_ioctl(dpif, ODP_SET_DROP_FRAGS, "ODP_SET_DROP_FRAGS", &tmp);
210 dpif_get_listen_mask(const struct dpif *dpif, int *listen_mask)
212 int error = do_ioctl(dpif, ODP_GET_LISTEN_MASK, "ODP_GET_LISTEN_MASK",
221 dpif_set_listen_mask(struct dpif *dpif, int listen_mask)
223 return do_ioctl(dpif, ODP_SET_LISTEN_MASK, "ODP_SET_LISTEN_MASK",
228 dpif_purge(struct dpif *dpif)
230 struct odp_stats stats;
234 COVERAGE_INC(dpif_purge);
236 error = dpif_get_dp_stats(dpif, &stats);
241 for (i = 0; i < stats.max_miss_queue + stats.max_action_queue; i++) {
243 error = dpif_recv(dpif, &buf);
245 return error == EAGAIN ? 0 : error;
253 dpif_port_add(struct dpif *dpif, const char *devname, uint16_t port_no,
256 struct odp_port port;
258 COVERAGE_INC(dpif_port_add);
259 memset(&port, 0, sizeof port);
260 strncpy(port.devname, devname, sizeof port.devname);
263 if (!ioctl(dpif->fd, ODP_PORT_ADD, &port)) {
264 VLOG_DBG_RL(&dpmsg_rl, "%s: added %s as port %"PRIu16,
265 dpif_name(dpif), devname, port_no);
268 VLOG_WARN_RL(&error_rl, "%s: failed to add %s as port %"PRIu16": %s",
269 dpif_name(dpif), devname, port_no, strerror(errno));
275 dpif_port_del(struct dpif *dpif, uint16_t port_no)
278 COVERAGE_INC(dpif_port_del);
279 return do_ioctl(dpif, ODP_PORT_DEL, "ODP_PORT_DEL", &tmp);
283 dpif_port_query_by_number(const struct dpif *dpif, uint16_t port_no,
284 struct odp_port *port)
286 memset(port, 0, sizeof *port);
287 port->port = port_no;
288 if (!ioctl(dpif->fd, ODP_PORT_QUERY, port)) {
289 VLOG_DBG_RL(&dpmsg_rl, "%s: port %"PRIu16" is device %s",
290 dpif_name(dpif), port_no, port->devname);
293 VLOG_WARN_RL(&error_rl, "%s: failed to query port %"PRIu16": %s",
294 dpif_name(dpif), port_no, strerror(errno));
300 dpif_port_query_by_name(const struct dpif *dpif, const char *devname,
301 struct odp_port *port)
303 memset(port, 0, sizeof *port);
304 strncpy(port->devname, devname, sizeof port->devname);
305 if (!ioctl(dpif->fd, ODP_PORT_QUERY, port)) {
306 VLOG_DBG_RL(&dpmsg_rl, "%s: device %s is on port %"PRIu16,
307 dpif_name(dpif), devname, port->port);
310 /* Log level is DBG here because all the current callers are interested
311 * in whether 'dpif' actually has a port 'devname', so that it's not an
312 * issue worth logging if it doesn't. */
313 VLOG_DBG_RL(&error_rl, "%s: failed to query port %s: %s",
314 dpif_name(dpif), devname, strerror(errno));
320 dpif_port_get_name(struct dpif *dpif, uint16_t port_no,
321 char *name, size_t name_size)
323 struct odp_port port;
326 assert(name_size > 0);
328 error = dpif_port_query_by_number(dpif, port_no, &port);
330 ovs_strlcpy(name, port.devname, name_size);
338 dpif_port_list(const struct dpif *dpif,
339 struct odp_port **ports, size_t *n_ports)
341 struct odp_portvec pv;
342 struct odp_stats stats;
346 error = dpif_get_dp_stats(dpif, &stats);
351 *ports = xcalloc(1, stats.n_ports * sizeof **ports);
353 pv.n_ports = stats.n_ports;
354 error = do_ioctl(dpif, ODP_PORT_LIST, "ODP_PORT_LIST", &pv);
359 } while (pv.n_ports != stats.n_ports);
360 *n_ports = pv.n_ports;
370 dpif_port_group_set(struct dpif *dpif, uint16_t group,
371 const uint16_t ports[], size_t n_ports)
373 struct odp_port_group pg;
375 COVERAGE_INC(dpif_port_group_set);
376 assert(n_ports <= UINT16_MAX);
378 pg.ports = (uint16_t *) ports;
379 pg.n_ports = n_ports;
380 return do_ioctl(dpif, ODP_PORT_GROUP_SET, "ODP_PORT_GROUP_SET", &pg);
383 /* Careful: '*n_out' can be greater than 'n_ports' on return, if 'n_ports' is
384 * less than the number of ports in 'group'. */
386 dpif_port_group_get(const struct dpif *dpif, uint16_t group,
387 uint16_t ports[], size_t n_ports, size_t *n_out)
389 struct odp_port_group pg;
392 assert(n_ports <= UINT16_MAX);
395 pg.n_ports = n_ports;
396 error = do_ioctl(dpif, ODP_PORT_GROUP_GET, "ODP_PORT_GROUP_GET", &pg);
397 *n_out = error ? 0 : pg.n_ports;
402 dpif_flow_flush(struct dpif *dpif)
404 COVERAGE_INC(dpif_flow_flush);
405 return do_ioctl(dpif, ODP_FLOW_FLUSH, "ODP_FLOW_FLUSH", NULL);
408 static enum vlog_level
409 flow_message_log_level(int error)
411 return error ? VLL_WARN : VLL_DBG;
415 should_log_flow_message(int error)
417 return !vlog_should_drop(THIS_MODULE, flow_message_log_level(error),
418 error ? &error_rl : &dpmsg_rl);
422 log_flow_message(const struct dpif *dpif, int error,
423 const char *operation,
424 const flow_t *flow, const struct odp_flow_stats *stats,
425 const union odp_action *actions, size_t n_actions)
427 struct ds ds = DS_EMPTY_INITIALIZER;
428 ds_put_format(&ds, "%s: ", dpif_name(dpif));
430 ds_put_cstr(&ds, "failed to ");
432 ds_put_format(&ds, "%s ", operation);
434 ds_put_format(&ds, "(%s) ", strerror(error));
436 flow_format(&ds, flow);
438 ds_put_cstr(&ds, ", ");
439 format_odp_flow_stats(&ds, stats);
441 if (actions || n_actions) {
442 ds_put_cstr(&ds, ", actions:");
443 format_odp_actions(&ds, actions, n_actions);
445 vlog(THIS_MODULE, flow_message_log_level(error), "%s", ds_cstr(&ds));
450 do_flow_ioctl(const struct dpif *dpif, int cmd, struct odp_flow *flow,
451 const char *operation, bool show_stats)
453 int error = do_ioctl(dpif, cmd, NULL, flow);
454 if (error && show_stats) {
457 if (should_log_flow_message(error)) {
458 log_flow_message(dpif, error, operation, &flow->key,
459 show_stats && !error ? &flow->stats : NULL,
460 flow->actions, flow->n_actions);
466 dpif_flow_put(struct dpif *dpif, struct odp_flow_put *put)
468 int error = do_ioctl(dpif, ODP_FLOW_PUT, NULL, put);
469 COVERAGE_INC(dpif_flow_put);
470 if (should_log_flow_message(error)) {
471 struct ds operation = DS_EMPTY_INITIALIZER;
472 ds_put_cstr(&operation, "put");
473 if (put->flags & ODPPF_CREATE) {
474 ds_put_cstr(&operation, "[create]");
476 if (put->flags & ODPPF_MODIFY) {
477 ds_put_cstr(&operation, "[modify]");
479 if (put->flags & ODPPF_ZERO_STATS) {
480 ds_put_cstr(&operation, "[zero]");
482 #define ODPPF_ALL (ODPPF_CREATE | ODPPF_MODIFY | ODPPF_ZERO_STATS)
483 if (put->flags & ~ODPPF_ALL) {
484 ds_put_format(&operation, "[%x]", put->flags & ~ODPPF_ALL);
486 log_flow_message(dpif, error, ds_cstr(&operation), &put->flow.key,
487 !error ? &put->flow.stats : NULL,
488 put->flow.actions, put->flow.n_actions);
489 ds_destroy(&operation);
495 dpif_flow_del(struct dpif *dpif, struct odp_flow *flow)
497 COVERAGE_INC(dpif_flow_del);
498 check_rw_odp_flow(flow);
499 memset(&flow->stats, 0, sizeof flow->stats);
500 return do_flow_ioctl(dpif, ODP_FLOW_DEL, flow, "delete flow", true);
504 dpif_flow_get(const struct dpif *dpif, struct odp_flow *flow)
506 COVERAGE_INC(dpif_flow_query);
507 check_rw_odp_flow(flow);
508 memset(&flow->stats, 0, sizeof flow->stats);
509 return do_flow_ioctl(dpif, ODP_FLOW_GET, flow, "get flow", true);
513 dpif_flow_get_multiple(const struct dpif *dpif,
514 struct odp_flow flows[], size_t n)
516 struct odp_flowvec fv;
519 COVERAGE_ADD(dpif_flow_query_multiple, n);
522 for (i = 0; i < n; i++) {
523 check_rw_odp_flow(&flows[i]);
525 return do_ioctl(dpif, ODP_FLOW_GET_MULTIPLE, "ODP_FLOW_GET_MULTIPLE",
530 dpif_flow_list(const struct dpif *dpif, struct odp_flow flows[], size_t n,
533 struct odp_flowvec fv;
537 COVERAGE_INC(dpif_flow_query_list);
540 if (RUNNING_ON_VALGRIND) {
541 memset(flows, 0, n * sizeof *flows);
543 for (i = 0; i < n; i++) {
544 flows[i].actions = NULL;
545 flows[i].n_actions = 0;
548 error = do_ioctl(dpif, ODP_FLOW_LIST, NULL, &fv);
551 VLOG_WARN_RL(&error_rl, "%s: flow list failed (%s)",
552 dpif_name(dpif), strerror(error));
554 COVERAGE_ADD(dpif_flow_query_list_n, fv.n_flows);
556 VLOG_DBG_RL(&dpmsg_rl, "%s: listed %zu flows",
557 dpif_name(dpif), *n_out);
563 dpif_flow_list_all(const struct dpif *dpif,
564 struct odp_flow **flowsp, size_t *np)
566 struct odp_stats stats;
567 struct odp_flow *flows;
574 error = dpif_get_dp_stats(dpif, &stats);
579 flows = xmalloc(sizeof *flows * stats.n_flows);
580 error = dpif_flow_list(dpif, flows, stats.n_flows, &n_flows);
586 if (stats.n_flows != n_flows) {
587 VLOG_WARN_RL(&error_rl, "%s: datapath stats reported %"PRIu32" "
588 "flows but flow listing reported %zu",
589 dpif_name(dpif), stats.n_flows, n_flows);
597 dpif_execute(struct dpif *dpif, uint16_t in_port,
598 const union odp_action actions[], size_t n_actions,
599 const struct ofpbuf *buf)
603 COVERAGE_INC(dpif_execute);
605 struct odp_execute execute;
606 memset(&execute, 0, sizeof execute);
607 execute.in_port = in_port;
608 execute.actions = (union odp_action *) actions;
609 execute.n_actions = n_actions;
610 execute.data = buf->data;
611 execute.length = buf->size;
612 error = do_ioctl(dpif, ODP_EXECUTE, NULL, &execute);
617 if (!(error ? VLOG_DROP_WARN(&error_rl) : VLOG_DROP_DBG(&dpmsg_rl))) {
618 struct ds ds = DS_EMPTY_INITIALIZER;
619 char *packet = ofp_packet_to_string(buf->data, buf->size, buf->size);
620 ds_put_format(&ds, "%s: execute ", dpif_name(dpif));
621 format_odp_actions(&ds, actions, n_actions);
623 ds_put_format(&ds, " failed (%s)", strerror(error));
625 ds_put_format(&ds, " on packet %s", packet);
626 vlog(THIS_MODULE, error ? VLL_WARN : VLL_DBG, "%s", ds_cstr(&ds));
634 dpif_recv(struct dpif *dpif, struct ofpbuf **bufp)
640 buf = ofpbuf_new(65536);
641 retval = read(dpif->fd, ofpbuf_tail(buf), ofpbuf_tailroom(buf));
644 if (error != EAGAIN) {
645 VLOG_WARN_RL(&error_rl, "%s: read failed: %s",
646 dpif_name(dpif), strerror(error));
648 } else if (retval >= sizeof(struct odp_msg)) {
649 struct odp_msg *msg = buf->data;
650 if (msg->length <= retval) {
652 if (VLOG_IS_DBG_ENABLED()) {
653 void *payload = msg + 1;
654 size_t length = buf->size - sizeof *msg;
655 char *s = ofp_packet_to_string(payload, length, length);
656 VLOG_DBG_RL(&dpmsg_rl, "%s: received %s message of length "
657 "%zu on port %"PRIu16": %s", dpif_name(dpif),
658 (msg->type == _ODPL_MISS_NR ? "miss"
659 : msg->type == _ODPL_ACTION_NR ? "action"
661 msg->length - sizeof(struct odp_msg),
666 COVERAGE_INC(dpif_recv);
669 VLOG_WARN_RL(&error_rl, "%s: discarding message truncated "
670 "from %zu bytes to %d",
671 dpif_name(dpif), msg->length, retval);
674 } else if (!retval) {
675 VLOG_WARN_RL(&error_rl, "%s: unexpected end of file", dpif_name(dpif));
678 VLOG_WARN_RL(&error_rl,
679 "%s: discarding too-short message (%d bytes)",
680 dpif_name(dpif), retval);
690 dpif_recv_wait(struct dpif *dpif)
692 poll_fd_wait(dpif->fd, POLLIN);
696 dpif_get_netflow_ids(const struct dpif *dpif,
697 uint8_t *engine_type, uint8_t *engine_id)
699 *engine_type = *engine_id = dpif->minor;
704 struct nl_sock *sock;
709 dpifmon_create(const char *datapath_name, struct dpifmon **monp)
712 char local_name[IFNAMSIZ];
715 mon = *monp = xmalloc(sizeof *mon);
717 error = dpif_open(datapath_name, &mon->dpif);
721 error = dpif_port_get_name(&mon->dpif, ODPP_LOCAL,
722 local_name, sizeof local_name);
724 goto error_close_dpif;
727 mon->local_ifindex = if_nametoindex(local_name);
728 if (!mon->local_ifindex) {
730 VLOG_WARN("could not get ifindex of %s device: %s",
731 local_name, strerror(errno));
732 goto error_close_dpif;
735 error = nl_sock_create(NETLINK_ROUTE, RTNLGRP_LINK, 0, 0, &mon->sock);
737 VLOG_WARN("could not create rtnetlink socket: %s", strerror(error));
738 goto error_close_dpif;
744 dpif_close(&mon->dpif);
752 dpifmon_destroy(struct dpifmon *mon)
755 dpif_close(&mon->dpif);
756 nl_sock_destroy(mon->sock);
761 dpifmon_poll(struct dpifmon *mon, char **devnamep)
763 static struct vlog_rate_limit slow_rl = VLOG_RATE_LIMIT_INIT(1, 5);
764 static const struct nl_policy rtnlgrp_link_policy[] = {
765 [IFLA_IFNAME] = { .type = NL_A_STRING },
766 [IFLA_MASTER] = { .type = NL_A_U32, .optional = true },
768 struct nlattr *attrs[ARRAY_SIZE(rtnlgrp_link_policy)];
774 error = nl_sock_recv(mon->sock, &buf, false);
777 if (!nl_policy_parse(buf, NLMSG_HDRLEN + sizeof(struct ifinfomsg),
779 attrs, ARRAY_SIZE(rtnlgrp_link_policy))) {
780 VLOG_WARN_RL(&slow_rl, "received bad rtnl message");
783 const char *devname = nl_attr_get_string(attrs[IFLA_IFNAME]);
786 if (attrs[IFLA_MASTER]) {
787 uint32_t master_ifindex = nl_attr_get_u32(attrs[IFLA_MASTER]);
788 for_us = master_ifindex == mon->local_ifindex;
790 /* It's for us if that device is one of our ports. */
791 struct odp_port port;
792 for_us = !dpif_port_query_by_name(mon->dpif, devname, &port);
796 /* Not for us, try again. */
798 COVERAGE_INC(dpifmon_poll_false_wakeup);
801 COVERAGE_INC(dpifmon_poll_changed);
802 *devnamep = xstrdup(devname);
812 VLOG_WARN_RL(&slow_rl, "dpifmon socket overflowed");
816 VLOG_WARN_RL(&slow_rl, "error on dpifmon socket: %s", strerror(error));
823 dpifmon_run(struct dpifmon *mon UNUSED)
825 /* Nothing to do in this implementation. */
829 dpifmon_wait(struct dpifmon *mon)
831 nl_sock_wait(mon->sock, POLLIN);
834 static int get_openvswitch_major(void);
835 static int get_major(const char *target, int default_major);
838 lookup_minor(const char *name, unsigned int *minor)
840 struct ethtool_drvinfo drvinfo;
846 sock = socket(AF_INET, SOCK_DGRAM, 0);
848 VLOG_WARN("socket(AF_INET) failed: %s", strerror(errno));
853 memset(&ifr, 0, sizeof ifr);
854 strncpy(ifr.ifr_name, name, sizeof ifr.ifr_name);
855 ifr.ifr_data = (caddr_t) &drvinfo;
857 memset(&drvinfo, 0, sizeof drvinfo);
858 drvinfo.cmd = ETHTOOL_GDRVINFO;
859 if (ioctl(sock, SIOCETHTOOL, &ifr)) {
860 VLOG_WARN("ioctl(SIOCETHTOOL) failed: %s", strerror(errno));
862 goto error_close_sock;
865 if (strcmp(drvinfo.driver, "openvswitch")) {
866 VLOG_WARN("%s is not an openvswitch device", name);
868 goto error_close_sock;
871 if (!isdigit(drvinfo.bus_info[0])) {
872 VLOG_WARN("%s ethtool info does not contain an openvswitch minor",
875 goto error_close_sock;
878 *minor = atoi(drvinfo.bus_info);
889 make_openvswitch_device(unsigned int minor, char **fnp)
891 dev_t dev = makedev(get_openvswitch_major(), minor);
892 const char dirname[] = "/dev/net";
897 sprintf(fn, "%s/dp%d", dirname, minor);
899 if (!S_ISCHR(s.st_mode)) {
900 VLOG_WARN_RL(&error_rl, "%s is not a character device, fixing",
902 } else if (s.st_rdev != dev) {
903 VLOG_WARN_RL(&error_rl,
904 "%s is device %u:%u instead of %u:%u, fixing",
905 fn, major(s.st_rdev), minor(s.st_rdev),
906 major(dev), minor(dev));
911 VLOG_WARN_RL(&error_rl, "%s: unlink failed (%s)",
912 fn, strerror(errno));
915 } else if (errno == ENOENT) {
916 if (stat(dirname, &s)) {
917 if (errno == ENOENT) {
918 if (mkdir(dirname, 0755)) {
919 VLOG_WARN_RL(&error_rl, "%s: mkdir failed (%s)",
920 dirname, strerror(errno));
924 VLOG_WARN_RL(&error_rl, "%s: stat failed (%s)",
925 dirname, strerror(errno));
930 VLOG_WARN_RL(&error_rl, "%s: stat failed (%s)", fn, strerror(errno));
934 /* The device needs to be created. */
935 if (mknod(fn, S_IFCHR | 0700, dev)) {
936 VLOG_WARN_RL(&error_rl,
937 "%s: creating character device %u:%u failed (%s)",
938 fn, major(dev), minor(dev), strerror(errno));
949 get_openvswitch_major(void)
951 static unsigned int openvswitch_major;
952 if (!openvswitch_major) {
953 enum { DEFAULT_MAJOR = 248 };
954 openvswitch_major = get_major("openvswitch", DEFAULT_MAJOR);
956 return openvswitch_major;
960 get_major(const char *target, int default_major)
962 const char fn[] = "/proc/devices";
967 file = fopen(fn, "r");
969 VLOG_ERR("opening %s failed (%s)", fn, strerror(errno));
973 for (ln = 1; fgets(line, sizeof line, file); ln++) {
977 if (!strncmp(line, "Character", 9) || line[0] == '\0') {
979 } else if (!strncmp(line, "Block", 5)) {
980 /* We only want character devices, so skip the rest of the file. */
982 } else if (sscanf(line, "%d %63s", &major, name)) {
983 if (!strcmp(name, target)) {
990 VLOG_WARN("%s:%d: syntax error", fn, ln);
996 VLOG_ERR("%s: %s major not found (is the module loaded?), using "
997 "default major %d", fn, target, default_major);
999 VLOG_INFO("using default major %d for %s", default_major, target);
1000 return default_major;
1004 name_to_minor(const char *name, unsigned int *minor)
1006 if (!get_minor_from_name(name, minor)) {
1009 return lookup_minor(name, minor);
1013 get_minor_from_name(const char *name, unsigned int *minor)
1015 if (!strncmp(name, "dp", 2) && isdigit(name[2])) {
1016 *minor = atoi(name + 2);
1018 } else if (!strncmp(name, "nl:", 3) && isdigit(name[3])) {
1019 /* This is for compatibility only and will be dropped. */
1020 *minor = atoi(name + 3);
1028 open_by_minor(unsigned int minor, struct dpif *dpif)
1036 error = make_openvswitch_device(minor, &fn);
1041 fd = open(fn, O_RDONLY | O_NONBLOCK);
1044 VLOG_WARN("%s: open failed (%s)", fn, strerror(error));
1050 dpif->name = xasprintf("dp%u", dpif->minor);
1051 dpif->minor = minor;
1056 /* There is a tendency to construct odp_flow objects on the stack and to
1057 * forget to properly initialize their "actions" and "n_actions" members.
1058 * When this happens, we get memory corruption because the kernel
1059 * writes through the random pointer that is in the "actions" member.
1061 * This function attempts to combat the problem by:
1063 * - Forcing a segfault if "actions" points to an invalid region (instead
1064 * of just getting back EFAULT, which can be easily missed in the log).
1066 * - Storing a distinctive value that is likely to cause an
1067 * easy-to-identify error later if it is dereferenced, etc.
1069 * - Triggering a warning on uninitialized memory from Valgrind if
1070 * "actions" or "n_actions" was not initialized.
1073 check_rw_odp_flow(struct odp_flow *flow)
1075 if (flow->n_actions) {
1076 memset(&flow->actions[0], 0xcc, sizeof flow->actions[0]);