2 * Copyright (c) 2008, 2009, 2010, 2011 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.
19 #include "dpif-linux.h"
27 #include <linux/types.h>
28 #include <linux/pkt_sched.h>
29 #include <linux/rtnetlink.h>
30 #include <linux/sockios.h>
35 #include "dpif-provider.h"
37 #include "netdev-vport.h"
38 #include "netlink-socket.h"
42 #include "openvswitch/tunnel.h"
44 #include "poll-loop.h"
45 #include "rtnetlink.h"
46 #include "rtnetlink-link.h"
49 #include "unaligned.h"
53 VLOG_DEFINE_THIS_MODULE(dpif_linux);
55 struct dpif_linux_dp {
56 /* Generic Netlink header. */
59 /* struct odp_header. */
63 const char *name; /* ODP_DP_ATTR_NAME. */
64 struct odp_stats stats; /* ODP_DP_ATTR_STATS. */
65 enum odp_frag_handling ipv4_frags; /* ODP_DP_ATTR_IPV4_FRAGS. */
66 const uint32_t *sampling; /* ODP_DP_ATTR_SAMPLING. */
67 uint32_t mcgroups[DPIF_N_UC_TYPES]; /* ODP_DP_ATTR_MCGROUPS. */
70 static void dpif_linux_dp_init(struct dpif_linux_dp *);
71 static int dpif_linux_dp_from_ofpbuf(struct dpif_linux_dp *,
72 const struct ofpbuf *);
73 static void dpif_linux_dp_dump_start(struct nl_dump *);
74 static int dpif_linux_dp_transact(const struct dpif_linux_dp *request,
75 struct dpif_linux_dp *reply,
76 struct ofpbuf **bufp);
77 static int dpif_linux_dp_get(const struct dpif *, struct dpif_linux_dp *reply,
78 struct ofpbuf **bufp);
80 struct dpif_linux_flow {
81 /* Generic Netlink header. */
84 /* struct odp_header. */
85 unsigned int nlmsg_flags;
90 * The 'stats' and 'used' members point to 64-bit data that might only be
91 * aligned on 32-bit boundaries, so get_unaligned_u64() should be used to
92 * access their values. */
93 const struct nlattr *key; /* ODP_FLOW_ATTR_KEY. */
95 const struct nlattr *actions; /* ODP_FLOW_ATTR_ACTIONS. */
97 const struct odp_flow_stats *stats; /* ODP_FLOW_ATTR_STATS. */
98 const uint8_t *tcp_flags; /* ODP_FLOW_ATTR_TCP_FLAGS. */
99 const uint64_t *used; /* ODP_FLOW_ATTR_USED. */
100 bool clear; /* ODP_FLOW_ATTR_CLEAR. */
103 static void dpif_linux_flow_init(struct dpif_linux_flow *);
104 static int dpif_linux_flow_from_ofpbuf(struct dpif_linux_flow *,
105 const struct ofpbuf *);
106 static void dpif_linux_flow_to_ofpbuf(const struct dpif_linux_flow *,
108 static int dpif_linux_flow_transact(const struct dpif_linux_flow *request,
109 struct dpif_linux_flow *reply,
110 struct ofpbuf **bufp);
111 static void dpif_linux_flow_get_stats(const struct dpif_linux_flow *,
112 struct dpif_flow_stats *);
114 /* Datapath interface for the openvswitch Linux kernel module. */
119 /* Multicast group messages. */
120 struct nl_sock *mc_sock;
121 uint32_t mcgroups[DPIF_N_UC_TYPES];
122 unsigned int listen_mask;
124 /* Change notification. */
125 struct shash changed_ports; /* Ports that have changed. */
126 struct rtnetlink_notifier port_notifier;
130 static struct vlog_rate_limit error_rl = VLOG_RATE_LIMIT_INIT(9999, 5);
132 /* Generic Netlink family numbers for ODP. */
133 static int odp_datapath_family;
134 static int odp_vport_family;
135 static int odp_flow_family;
136 static int odp_packet_family;
138 /* Generic Netlink socket. */
139 static struct nl_sock *genl_sock;
141 static int dpif_linux_init(void);
142 static int open_dpif(const struct dpif_linux_dp *, struct dpif **);
143 static void dpif_linux_port_changed(const struct rtnetlink_link_change *,
146 static void dpif_linux_vport_to_ofpbuf(const struct dpif_linux_vport *,
148 static int dpif_linux_vport_from_ofpbuf(struct dpif_linux_vport *,
149 const struct ofpbuf *);
151 static struct dpif_linux *
152 dpif_linux_cast(const struct dpif *dpif)
154 dpif_assert_class(dpif, &dpif_linux_class);
155 return CONTAINER_OF(dpif, struct dpif_linux, dpif);
159 dpif_linux_enumerate(struct svec *all_dps)
165 error = dpif_linux_init();
170 dpif_linux_dp_dump_start(&dump);
171 while (nl_dump_next(&dump, &msg)) {
172 struct dpif_linux_dp dp;
174 if (!dpif_linux_dp_from_ofpbuf(&dp, &msg)) {
175 svec_add(all_dps, dp.name);
178 return nl_dump_done(&dump);
182 dpif_linux_open(const struct dpif_class *class OVS_UNUSED, const char *name,
183 bool create, struct dpif **dpifp)
185 struct dpif_linux_dp dp_request, dp;
189 error = dpif_linux_init();
194 /* Create or look up datapath. */
195 dpif_linux_dp_init(&dp_request);
196 dp_request.cmd = create ? ODP_DP_CMD_NEW : ODP_DP_CMD_GET;
197 dp_request.name = name;
198 error = dpif_linux_dp_transact(&dp_request, &dp, &buf);
202 error = open_dpif(&dp, dpifp);
209 open_dpif(const struct dpif_linux_dp *dp, struct dpif **dpifp)
211 struct dpif_linux *dpif;
216 dpif = xmalloc(sizeof *dpif);
217 error = rtnetlink_link_notifier_register(&dpif->port_notifier,
218 dpif_linux_port_changed, dpif);
223 dpif_init(&dpif->dpif, &dpif_linux_class, dp->name,
224 dp->dp_ifindex, dp->dp_ifindex);
227 dpif->mc_sock = NULL;
228 for (i = 0; i < DPIF_N_UC_TYPES; i++) {
229 dpif->mcgroups[i] = dp->mcgroups[i];
231 dpif->listen_mask = 0;
232 dpif->dp_ifindex = dp->dp_ifindex;
233 shash_init(&dpif->changed_ports);
234 dpif->change_error = false;
235 *dpifp = &dpif->dpif;
245 dpif_linux_close(struct dpif *dpif_)
247 struct dpif_linux *dpif = dpif_linux_cast(dpif_);
248 rtnetlink_link_notifier_unregister(&dpif->port_notifier);
249 shash_destroy(&dpif->changed_ports);
254 dpif_linux_destroy(struct dpif *dpif_)
256 struct dpif_linux *dpif = dpif_linux_cast(dpif_);
257 struct dpif_linux_dp dp;
259 dpif_linux_dp_init(&dp);
260 dp.cmd = ODP_DP_CMD_DEL;
261 dp.dp_ifindex = dpif->dp_ifindex;
262 return dpif_linux_dp_transact(&dp, NULL, NULL);
266 dpif_linux_get_stats(const struct dpif *dpif_, struct odp_stats *stats)
268 struct dpif_linux_dp dp;
272 error = dpif_linux_dp_get(dpif_, &dp, &buf);
281 dpif_linux_get_drop_frags(const struct dpif *dpif_, bool *drop_fragsp)
283 struct dpif_linux_dp dp;
287 error = dpif_linux_dp_get(dpif_, &dp, &buf);
289 *drop_fragsp = dp.ipv4_frags == ODP_DP_FRAG_DROP;
296 dpif_linux_set_drop_frags(struct dpif *dpif_, bool drop_frags)
298 struct dpif_linux *dpif = dpif_linux_cast(dpif_);
299 struct dpif_linux_dp dp;
301 dpif_linux_dp_init(&dp);
302 dp.cmd = ODP_DP_CMD_SET;
303 dp.dp_ifindex = dpif->dp_ifindex;
304 dp.ipv4_frags = drop_frags ? ODP_DP_FRAG_DROP : ODP_DP_FRAG_ZERO;
305 return dpif_linux_dp_transact(&dp, NULL, NULL);
309 dpif_linux_port_add(struct dpif *dpif_, struct netdev *netdev,
312 struct dpif_linux *dpif = dpif_linux_cast(dpif_);
313 const char *name = netdev_get_name(netdev);
314 const char *type = netdev_get_type(netdev);
315 struct dpif_linux_vport request, reply;
316 const struct ofpbuf *options;
320 dpif_linux_vport_init(&request);
321 request.cmd = ODP_VPORT_CMD_NEW;
322 request.dp_ifindex = dpif->dp_ifindex;
323 request.type = netdev_vport_get_vport_type(netdev);
324 if (request.type == ODP_VPORT_TYPE_UNSPEC) {
325 VLOG_WARN_RL(&error_rl, "%s: cannot create port `%s' because it has "
326 "unsupported type `%s'",
327 dpif_name(dpif_), name, type);
332 options = netdev_vport_get_options(netdev);
333 if (options && options->size) {
334 request.options = options->data;
335 request.options_len = options->size;
338 error = dpif_linux_vport_transact(&request, &reply, &buf);
340 *port_nop = reply.port_no;
348 dpif_linux_port_del(struct dpif *dpif_, uint16_t port_no)
350 struct dpif_linux *dpif = dpif_linux_cast(dpif_);
351 struct dpif_linux_vport vport;
353 dpif_linux_vport_init(&vport);
354 vport.cmd = ODP_VPORT_CMD_DEL;
355 vport.dp_ifindex = dpif->dp_ifindex;
356 vport.port_no = port_no;
357 return dpif_linux_vport_transact(&vport, NULL, NULL);
361 dpif_linux_port_query__(const struct dpif *dpif, uint32_t port_no,
362 const char *port_name, struct dpif_port *dpif_port)
364 struct dpif_linux_vport request;
365 struct dpif_linux_vport reply;
369 dpif_linux_vport_init(&request);
370 request.cmd = ODP_VPORT_CMD_GET;
371 request.dp_ifindex = dpif_linux_cast(dpif)->dp_ifindex;
372 request.port_no = port_no;
373 request.name = port_name;
375 error = dpif_linux_vport_transact(&request, &reply, &buf);
377 dpif_port->name = xstrdup(reply.name);
378 dpif_port->type = xstrdup(netdev_vport_get_netdev_type(&reply));
379 dpif_port->port_no = reply.port_no;
386 dpif_linux_port_query_by_number(const struct dpif *dpif, uint16_t port_no,
387 struct dpif_port *dpif_port)
389 return dpif_linux_port_query__(dpif, port_no, NULL, dpif_port);
393 dpif_linux_port_query_by_name(const struct dpif *dpif, const char *devname,
394 struct dpif_port *dpif_port)
396 return dpif_linux_port_query__(dpif, 0, devname, dpif_port);
400 dpif_linux_get_max_ports(const struct dpif *dpif OVS_UNUSED)
402 /* If the datapath increases its range of supported ports, then it should
403 * start reporting that. */
408 dpif_linux_flow_flush(struct dpif *dpif_)
410 struct dpif_linux *dpif = dpif_linux_cast(dpif_);
411 struct dpif_linux_flow flow;
413 dpif_linux_flow_init(&flow);
414 flow.cmd = ODP_FLOW_CMD_DEL;
415 flow.dp_ifindex = dpif->dp_ifindex;
416 return dpif_linux_flow_transact(&flow, NULL, NULL);
419 struct dpif_linux_port_state {
424 dpif_linux_port_dump_start(const struct dpif *dpif_, void **statep)
426 struct dpif_linux *dpif = dpif_linux_cast(dpif_);
427 struct dpif_linux_port_state *state;
428 struct dpif_linux_vport request;
431 *statep = state = xmalloc(sizeof *state);
433 dpif_linux_vport_init(&request);
434 request.cmd = ODP_DP_CMD_GET;
435 request.dp_ifindex = dpif->dp_ifindex;
437 buf = ofpbuf_new(1024);
438 dpif_linux_vport_to_ofpbuf(&request, buf);
439 nl_dump_start(&state->dump, genl_sock, buf);
446 dpif_linux_port_dump_next(const struct dpif *dpif OVS_UNUSED, void *state_,
447 struct dpif_port *dpif_port)
449 struct dpif_linux_port_state *state = state_;
450 struct dpif_linux_vport vport;
454 if (!nl_dump_next(&state->dump, &buf)) {
458 error = dpif_linux_vport_from_ofpbuf(&vport, &buf);
463 dpif_port->name = (char *) vport.name;
464 dpif_port->type = (char *) netdev_vport_get_netdev_type(&vport);
465 dpif_port->port_no = vport.port_no;
470 dpif_linux_port_dump_done(const struct dpif *dpif OVS_UNUSED, void *state_)
472 struct dpif_linux_port_state *state = state_;
473 int error = nl_dump_done(&state->dump);
479 dpif_linux_port_poll(const struct dpif *dpif_, char **devnamep)
481 struct dpif_linux *dpif = dpif_linux_cast(dpif_);
483 if (dpif->change_error) {
484 dpif->change_error = false;
485 shash_clear(&dpif->changed_ports);
487 } else if (!shash_is_empty(&dpif->changed_ports)) {
488 struct shash_node *node = shash_first(&dpif->changed_ports);
489 *devnamep = shash_steal(&dpif->changed_ports, node);
497 dpif_linux_port_poll_wait(const struct dpif *dpif_)
499 struct dpif_linux *dpif = dpif_linux_cast(dpif_);
500 if (!shash_is_empty(&dpif->changed_ports) || dpif->change_error) {
501 poll_immediate_wake();
503 rtnetlink_link_notifier_wait();
508 dpif_linux_flow_get(const struct dpif *dpif_,
509 const struct nlattr *key, size_t key_len,
510 struct ofpbuf **actionsp, struct dpif_flow_stats *stats)
512 struct dpif_linux *dpif = dpif_linux_cast(dpif_);
513 struct dpif_linux_flow request, reply;
517 dpif_linux_flow_init(&request);
518 request.cmd = ODP_FLOW_CMD_GET;
519 request.dp_ifindex = dpif->dp_ifindex;
521 request.key_len = key_len;
522 error = dpif_linux_flow_transact(&request, &reply, &buf);
525 dpif_linux_flow_get_stats(&reply, stats);
528 buf->data = (void *) reply.actions;
529 buf->size = reply.actions_len;
539 dpif_linux_flow_put(struct dpif *dpif_, enum dpif_flow_put_flags flags,
540 const struct nlattr *key, size_t key_len,
541 const struct nlattr *actions, size_t actions_len,
542 struct dpif_flow_stats *stats)
544 struct dpif_linux *dpif = dpif_linux_cast(dpif_);
545 struct dpif_linux_flow request, reply;
549 dpif_linux_flow_init(&request);
550 request.cmd = flags & DPIF_FP_CREATE ? ODP_FLOW_CMD_NEW : ODP_FLOW_CMD_SET;
551 request.dp_ifindex = dpif->dp_ifindex;
553 request.key_len = key_len;
554 request.actions = actions;
555 request.actions_len = actions_len;
556 if (flags & DPIF_FP_ZERO_STATS) {
557 request.clear = true;
559 request.nlmsg_flags = flags & DPIF_FP_MODIFY ? 0 : NLM_F_CREATE;
560 error = dpif_linux_flow_transact(&request,
561 stats ? &reply : NULL,
562 stats ? &buf : NULL);
563 if (!error && stats) {
564 dpif_linux_flow_get_stats(&reply, stats);
571 dpif_linux_flow_del(struct dpif *dpif_,
572 const struct nlattr *key, size_t key_len,
573 struct dpif_flow_stats *stats)
575 struct dpif_linux *dpif = dpif_linux_cast(dpif_);
576 struct dpif_linux_flow request, reply;
580 dpif_linux_flow_init(&request);
581 request.cmd = ODP_FLOW_CMD_DEL;
582 request.dp_ifindex = dpif->dp_ifindex;
584 request.key_len = key_len;
585 error = dpif_linux_flow_transact(&request,
586 stats ? &reply : NULL,
587 stats ? &buf : NULL);
588 if (!error && stats) {
589 dpif_linux_flow_get_stats(&reply, stats);
595 struct dpif_linux_flow_state {
597 struct dpif_linux_flow flow;
598 struct dpif_flow_stats stats;
602 dpif_linux_flow_dump_start(const struct dpif *dpif_, void **statep)
604 struct dpif_linux *dpif = dpif_linux_cast(dpif_);
605 struct dpif_linux_flow_state *state;
606 struct dpif_linux_flow request;
609 *statep = state = xmalloc(sizeof *state);
611 dpif_linux_flow_init(&request);
612 request.cmd = ODP_DP_CMD_GET;
613 request.dp_ifindex = dpif->dp_ifindex;
615 buf = ofpbuf_new(1024);
616 dpif_linux_flow_to_ofpbuf(&request, buf);
617 nl_dump_start(&state->dump, genl_sock, buf);
624 dpif_linux_flow_dump_next(const struct dpif *dpif_ OVS_UNUSED, void *state_,
625 const struct nlattr **key, size_t *key_len,
626 const struct nlattr **actions, size_t *actions_len,
627 const struct dpif_flow_stats **stats)
629 struct dpif_linux_flow_state *state = state_;
633 if (!nl_dump_next(&state->dump, &buf)) {
637 error = dpif_linux_flow_from_ofpbuf(&state->flow, &buf);
640 *key = state->flow.key;
641 *key_len = state->flow.key_len;
644 *actions = state->flow.actions;
645 *actions_len = state->flow.actions_len;
648 dpif_linux_flow_get_stats(&state->flow, &state->stats);
649 *stats = &state->stats;
656 dpif_linux_flow_dump_done(const struct dpif *dpif OVS_UNUSED, void *state_)
658 struct dpif_linux_flow_state *state = state_;
659 int error = nl_dump_done(&state->dump);
665 dpif_linux_execute(struct dpif *dpif_,
666 const struct nlattr *actions, size_t actions_len,
667 const struct ofpbuf *packet)
669 struct dpif_linux *dpif = dpif_linux_cast(dpif_);
670 struct odp_header *execute;
674 buf = ofpbuf_new(128 + actions_len + packet->size);
676 nl_msg_put_genlmsghdr(buf, 0, odp_packet_family, NLM_F_REQUEST,
677 ODP_PACKET_CMD_EXECUTE, 1);
679 execute = ofpbuf_put_uninit(buf, sizeof *execute);
680 execute->dp_ifindex = dpif->dp_ifindex;
682 nl_msg_put_unspec(buf, ODP_PACKET_ATTR_PACKET, packet->data, packet->size);
683 nl_msg_put_unspec(buf, ODP_PACKET_ATTR_ACTIONS, actions, actions_len);
685 error = nl_sock_transact(genl_sock, buf, NULL);
691 dpif_linux_recv_get_mask(const struct dpif *dpif_, int *listen_mask)
693 struct dpif_linux *dpif = dpif_linux_cast(dpif_);
694 *listen_mask = dpif->listen_mask;
699 dpif_linux_recv_set_mask(struct dpif *dpif_, int listen_mask)
701 struct dpif_linux *dpif = dpif_linux_cast(dpif_);
705 if (listen_mask == dpif->listen_mask) {
707 } else if (!listen_mask) {
708 nl_sock_destroy(dpif->mc_sock);
709 dpif->mc_sock = NULL;
710 dpif->listen_mask = 0;
712 } else if (!dpif->mc_sock) {
713 error = nl_sock_create(NETLINK_GENERIC, &dpif->mc_sock);
719 /* Unsubscribe from old groups. */
720 for (i = 0; i < DPIF_N_UC_TYPES; i++) {
721 if (dpif->listen_mask & (1u << i)) {
722 nl_sock_leave_mcgroup(dpif->mc_sock, dpif->mcgroups[i]);
726 /* Update listen_mask. */
727 dpif->listen_mask = listen_mask;
729 /* Subscribe to new groups. */
731 for (i = 0; i < DPIF_N_UC_TYPES; i++) {
732 if (dpif->listen_mask & (1u << i)) {
735 retval = nl_sock_join_mcgroup(dpif->mc_sock, dpif->mcgroups[i]);
745 dpif_linux_get_sflow_probability(const struct dpif *dpif_,
746 uint32_t *probability)
748 struct dpif_linux_dp dp;
752 error = dpif_linux_dp_get(dpif_, &dp, &buf);
754 *probability = dp.sampling ? *dp.sampling : 0;
761 dpif_linux_set_sflow_probability(struct dpif *dpif_, uint32_t probability)
763 struct dpif_linux *dpif = dpif_linux_cast(dpif_);
764 struct dpif_linux_dp dp;
766 dpif_linux_dp_init(&dp);
767 dp.cmd = ODP_DP_CMD_SET;
768 dp.dp_ifindex = dpif->dp_ifindex;
769 dp.sampling = &probability;
770 return dpif_linux_dp_transact(&dp, NULL, NULL);
774 dpif_linux_queue_to_priority(const struct dpif *dpif OVS_UNUSED,
775 uint32_t queue_id, uint32_t *priority)
777 if (queue_id < 0xf000) {
778 *priority = TC_H_MAKE(1 << 16, queue_id + 1);
786 parse_odp_packet(struct ofpbuf *buf, struct dpif_upcall *upcall,
789 static const struct nl_policy odp_packet_policy[] = {
790 /* Always present. */
791 [ODP_PACKET_ATTR_PACKET] = { .type = NL_A_UNSPEC,
792 .min_len = ETH_HEADER_LEN },
793 [ODP_PACKET_ATTR_KEY] = { .type = NL_A_NESTED },
795 /* ODP_PACKET_CMD_ACTION only. */
796 [ODP_PACKET_ATTR_USERDATA] = { .type = NL_A_U64, .optional = true },
798 /* ODP_PACKET_CMD_SAMPLE only. */
799 [ODP_PACKET_ATTR_SAMPLE_POOL] = { .type = NL_A_U32, .optional = true },
800 [ODP_PACKET_ATTR_ACTIONS] = { .type = NL_A_NESTED, .optional = true },
803 struct odp_header *odp_header;
804 struct nlattr *a[ARRAY_SIZE(odp_packet_policy)];
805 struct nlmsghdr *nlmsg;
806 struct genlmsghdr *genl;
810 ofpbuf_use_const(&b, buf->data, buf->size);
812 nlmsg = ofpbuf_try_pull(&b, sizeof *nlmsg);
813 genl = ofpbuf_try_pull(&b, sizeof *genl);
814 odp_header = ofpbuf_try_pull(&b, sizeof *odp_header);
815 if (!nlmsg || !genl || !odp_header
816 || nlmsg->nlmsg_type != odp_packet_family
817 || !nl_policy_parse(&b, 0, odp_packet_policy, a,
818 ARRAY_SIZE(odp_packet_policy))) {
822 type = (genl->cmd == ODP_PACKET_CMD_MISS ? DPIF_UC_MISS
823 : genl->cmd == ODP_PACKET_CMD_ACTION ? DPIF_UC_ACTION
824 : genl->cmd == ODP_PACKET_CMD_SAMPLE ? DPIF_UC_SAMPLE
830 memset(upcall, 0, sizeof *upcall);
832 upcall->packet = buf;
833 upcall->packet->data = (void *) nl_attr_get(a[ODP_PACKET_ATTR_PACKET]);
834 upcall->packet->size = nl_attr_get_size(a[ODP_PACKET_ATTR_PACKET]);
835 upcall->key = (void *) nl_attr_get(a[ODP_PACKET_ATTR_KEY]);
836 upcall->key_len = nl_attr_get_size(a[ODP_PACKET_ATTR_KEY]);
837 upcall->userdata = (a[ODP_PACKET_ATTR_USERDATA]
838 ? nl_attr_get_u64(a[ODP_PACKET_ATTR_USERDATA])
840 upcall->sample_pool = (a[ODP_PACKET_ATTR_SAMPLE_POOL]
841 ? nl_attr_get_u32(a[ODP_PACKET_ATTR_SAMPLE_POOL])
843 if (a[ODP_PACKET_ATTR_ACTIONS]) {
844 upcall->actions = (void *) nl_attr_get(a[ODP_PACKET_ATTR_ACTIONS]);
845 upcall->actions_len = nl_attr_get_size(a[ODP_PACKET_ATTR_ACTIONS]);
848 *dp_ifindex = odp_header->dp_ifindex;
854 dpif_linux_recv(struct dpif *dpif_, struct dpif_upcall *upcall)
856 struct dpif_linux *dpif = dpif_linux_cast(dpif_);
861 if (!dpif->mc_sock) {
865 for (i = 0; i < 50; i++) {
868 error = nl_sock_recv(dpif->mc_sock, &buf, false);
873 error = parse_odp_packet(buf, upcall, &dp_ifindex);
875 && dp_ifindex == dpif->dp_ifindex
876 && dpif->listen_mask & (1u << upcall->type)) {
890 dpif_linux_recv_wait(struct dpif *dpif_)
892 struct dpif_linux *dpif = dpif_linux_cast(dpif_);
894 nl_sock_wait(dpif->mc_sock, POLLIN);
899 dpif_linux_recv_purge(struct dpif *dpif_)
901 struct dpif_linux *dpif = dpif_linux_cast(dpif_);
904 nl_sock_drain(dpif->mc_sock);
908 const struct dpif_class dpif_linux_class = {
912 dpif_linux_enumerate,
915 NULL, /* get_all_names */
917 dpif_linux_get_stats,
918 dpif_linux_get_drop_frags,
919 dpif_linux_set_drop_frags,
922 dpif_linux_port_query_by_number,
923 dpif_linux_port_query_by_name,
924 dpif_linux_get_max_ports,
925 dpif_linux_port_dump_start,
926 dpif_linux_port_dump_next,
927 dpif_linux_port_dump_done,
928 dpif_linux_port_poll,
929 dpif_linux_port_poll_wait,
933 dpif_linux_flow_flush,
934 dpif_linux_flow_dump_start,
935 dpif_linux_flow_dump_next,
936 dpif_linux_flow_dump_done,
938 dpif_linux_recv_get_mask,
939 dpif_linux_recv_set_mask,
940 dpif_linux_get_sflow_probability,
941 dpif_linux_set_sflow_probability,
942 dpif_linux_queue_to_priority,
944 dpif_linux_recv_wait,
945 dpif_linux_recv_purge,
949 dpif_linux_init(void)
951 static int error = -1;
954 error = nl_lookup_genl_family(ODP_DATAPATH_FAMILY,
955 &odp_datapath_family);
957 VLOG_ERR("Generic Netlink family '%s' does not exist. "
958 "The Open vSwitch kernel module is probably not loaded.",
959 ODP_DATAPATH_FAMILY);
962 error = nl_lookup_genl_family(ODP_VPORT_FAMILY, &odp_vport_family);
965 error = nl_lookup_genl_family(ODP_FLOW_FAMILY, &odp_flow_family);
968 error = nl_lookup_genl_family(ODP_PACKET_FAMILY,
972 error = nl_sock_create(NETLINK_GENERIC, &genl_sock);
980 dpif_linux_is_internal_device(const char *name)
982 struct dpif_linux_vport reply;
986 error = dpif_linux_vport_get(name, &reply, &buf);
989 } else if (error != ENODEV) {
990 VLOG_WARN_RL(&error_rl, "%s: vport query failed (%s)",
991 name, strerror(error));
994 return reply.type == ODP_VPORT_TYPE_INTERNAL;
998 dpif_linux_port_changed(const struct rtnetlink_link_change *change,
1001 struct dpif_linux *dpif = dpif_;
1004 if (change->master_ifindex == dpif->dp_ifindex
1005 && (change->nlmsg_type == RTM_NEWLINK
1006 || change->nlmsg_type == RTM_DELLINK))
1008 /* Our datapath changed, either adding a new port or deleting an
1010 shash_add_once(&dpif->changed_ports, change->ifname, NULL);
1013 dpif->change_error = true;
1017 /* Parses the contents of 'buf', which contains a "struct odp_header" followed
1018 * by Netlink attributes, into 'vport'. Returns 0 if successful, otherwise a
1019 * positive errno value.
1021 * 'vport' will contain pointers into 'buf', so the caller should not free
1022 * 'buf' while 'vport' is still in use. */
1024 dpif_linux_vport_from_ofpbuf(struct dpif_linux_vport *vport,
1025 const struct ofpbuf *buf)
1027 static const struct nl_policy odp_vport_policy[] = {
1028 [ODP_VPORT_ATTR_PORT_NO] = { .type = NL_A_U32 },
1029 [ODP_VPORT_ATTR_TYPE] = { .type = NL_A_U32 },
1030 [ODP_VPORT_ATTR_NAME] = { .type = NL_A_STRING, .max_len = IFNAMSIZ },
1031 [ODP_VPORT_ATTR_STATS] = { .type = NL_A_UNSPEC,
1032 .min_len = sizeof(struct rtnl_link_stats64),
1033 .max_len = sizeof(struct rtnl_link_stats64),
1035 [ODP_VPORT_ATTR_ADDRESS] = { .type = NL_A_UNSPEC,
1036 .min_len = ETH_ADDR_LEN,
1037 .max_len = ETH_ADDR_LEN,
1039 [ODP_VPORT_ATTR_MTU] = { .type = NL_A_U32, .optional = true },
1040 [ODP_VPORT_ATTR_OPTIONS] = { .type = NL_A_NESTED, .optional = true },
1041 [ODP_VPORT_ATTR_IFINDEX] = { .type = NL_A_U32, .optional = true },
1042 [ODP_VPORT_ATTR_IFLINK] = { .type = NL_A_U32, .optional = true },
1045 struct nlattr *a[ARRAY_SIZE(odp_vport_policy)];
1046 struct odp_header *odp_header;
1047 struct nlmsghdr *nlmsg;
1048 struct genlmsghdr *genl;
1051 dpif_linux_vport_init(vport);
1053 ofpbuf_use_const(&b, buf->data, buf->size);
1054 nlmsg = ofpbuf_try_pull(&b, sizeof *nlmsg);
1055 genl = ofpbuf_try_pull(&b, sizeof *genl);
1056 odp_header = ofpbuf_try_pull(&b, sizeof *odp_header);
1057 if (!nlmsg || !genl || !odp_header
1058 || nlmsg->nlmsg_type != odp_vport_family
1059 || !nl_policy_parse(&b, 0, odp_vport_policy, a,
1060 ARRAY_SIZE(odp_vport_policy))) {
1064 vport->cmd = genl->cmd;
1065 vport->dp_ifindex = odp_header->dp_ifindex;
1066 vport->port_no = nl_attr_get_u32(a[ODP_VPORT_ATTR_PORT_NO]);
1067 vport->type = nl_attr_get_u32(a[ODP_VPORT_ATTR_TYPE]);
1068 vport->name = nl_attr_get_string(a[ODP_VPORT_ATTR_NAME]);
1069 if (a[ODP_VPORT_ATTR_STATS]) {
1070 vport->stats = nl_attr_get(a[ODP_VPORT_ATTR_STATS]);
1072 if (a[ODP_VPORT_ATTR_ADDRESS]) {
1073 vport->address = nl_attr_get(a[ODP_VPORT_ATTR_ADDRESS]);
1075 if (a[ODP_VPORT_ATTR_MTU]) {
1076 vport->mtu = nl_attr_get_u32(a[ODP_VPORT_ATTR_MTU]);
1078 if (a[ODP_VPORT_ATTR_OPTIONS]) {
1079 vport->options = nl_attr_get(a[ODP_VPORT_ATTR_OPTIONS]);
1080 vport->options_len = nl_attr_get_size(a[ODP_VPORT_ATTR_OPTIONS]);
1082 if (a[ODP_VPORT_ATTR_IFINDEX]) {
1083 vport->ifindex = nl_attr_get_u32(a[ODP_VPORT_ATTR_IFINDEX]);
1085 if (a[ODP_VPORT_ATTR_IFLINK]) {
1086 vport->iflink = nl_attr_get_u32(a[ODP_VPORT_ATTR_IFLINK]);
1091 /* Appends to 'buf' (which must initially be empty) a "struct odp_header"
1092 * followed by Netlink attributes corresponding to 'vport'. */
1094 dpif_linux_vport_to_ofpbuf(const struct dpif_linux_vport *vport,
1097 struct odp_header *odp_header;
1099 nl_msg_put_genlmsghdr(buf, 0, odp_vport_family, NLM_F_REQUEST | NLM_F_ECHO,
1102 odp_header = ofpbuf_put_uninit(buf, sizeof *odp_header);
1103 odp_header->dp_ifindex = vport->dp_ifindex;
1105 if (vport->port_no != UINT32_MAX) {
1106 nl_msg_put_u32(buf, ODP_VPORT_ATTR_PORT_NO, vport->port_no);
1109 if (vport->type != ODP_VPORT_TYPE_UNSPEC) {
1110 nl_msg_put_u32(buf, ODP_VPORT_ATTR_TYPE, vport->type);
1114 nl_msg_put_string(buf, ODP_VPORT_ATTR_NAME, vport->name);
1118 nl_msg_put_unspec(buf, ODP_VPORT_ATTR_STATS,
1119 vport->stats, sizeof *vport->stats);
1122 if (vport->address) {
1123 nl_msg_put_unspec(buf, ODP_VPORT_ATTR_ADDRESS,
1124 vport->address, ETH_ADDR_LEN);
1128 nl_msg_put_u32(buf, ODP_VPORT_ATTR_MTU, vport->mtu);
1131 if (vport->options) {
1132 nl_msg_put_nested(buf, ODP_VPORT_ATTR_OPTIONS,
1133 vport->options, vport->options_len);
1136 if (vport->ifindex) {
1137 nl_msg_put_u32(buf, ODP_VPORT_ATTR_IFINDEX, vport->ifindex);
1140 if (vport->iflink) {
1141 nl_msg_put_u32(buf, ODP_VPORT_ATTR_IFLINK, vport->iflink);
1145 /* Clears 'vport' to "empty" values. */
1147 dpif_linux_vport_init(struct dpif_linux_vport *vport)
1149 memset(vport, 0, sizeof *vport);
1150 vport->port_no = UINT32_MAX;
1153 /* Executes 'request' in the kernel datapath. If the command fails, returns a
1154 * positive errno value. Otherwise, if 'reply' and 'bufp' are null, returns 0
1155 * without doing anything else. If 'reply' and 'bufp' are nonnull, then the
1156 * result of the command is expected to be an odp_vport also, which is decoded
1157 * and stored in '*reply' and '*bufp'. The caller must free '*bufp' when the
1158 * reply is no longer needed ('reply' will contain pointers into '*bufp'). */
1160 dpif_linux_vport_transact(const struct dpif_linux_vport *request,
1161 struct dpif_linux_vport *reply,
1162 struct ofpbuf **bufp)
1164 struct ofpbuf *request_buf;
1167 assert((reply != NULL) == (bufp != NULL));
1169 request_buf = ofpbuf_new(1024);
1170 dpif_linux_vport_to_ofpbuf(request, request_buf);
1171 error = nl_sock_transact(genl_sock, request_buf, bufp);
1172 ofpbuf_delete(request_buf);
1176 error = dpif_linux_vport_from_ofpbuf(reply, *bufp);
1179 dpif_linux_vport_init(reply);
1180 ofpbuf_delete(*bufp);
1187 /* Obtains information about the kernel vport named 'name' and stores it into
1188 * '*reply' and '*bufp'. The caller must free '*bufp' when the reply is no
1189 * longer needed ('reply' will contain pointers into '*bufp'). */
1191 dpif_linux_vport_get(const char *name, struct dpif_linux_vport *reply,
1192 struct ofpbuf **bufp)
1194 struct dpif_linux_vport request;
1196 dpif_linux_vport_init(&request);
1197 request.cmd = ODP_VPORT_CMD_GET;
1198 request.name = name;
1200 return dpif_linux_vport_transact(&request, reply, bufp);
1203 /* Parses the contents of 'buf', which contains a "struct odp_header" followed
1204 * by Netlink attributes, into 'dp'. Returns 0 if successful, otherwise a
1205 * positive errno value.
1207 * 'dp' will contain pointers into 'buf', so the caller should not free 'buf'
1208 * while 'dp' is still in use. */
1210 dpif_linux_dp_from_ofpbuf(struct dpif_linux_dp *dp, const struct ofpbuf *buf)
1212 static const struct nl_policy odp_datapath_policy[] = {
1213 [ODP_DP_ATTR_NAME] = { .type = NL_A_STRING, .max_len = IFNAMSIZ },
1214 [ODP_DP_ATTR_STATS] = { .type = NL_A_UNSPEC,
1215 .min_len = sizeof(struct odp_stats),
1216 .max_len = sizeof(struct odp_stats),
1218 [ODP_DP_ATTR_IPV4_FRAGS] = { .type = NL_A_U32, .optional = true },
1219 [ODP_DP_ATTR_SAMPLING] = { .type = NL_A_U32, .optional = true },
1220 [ODP_DP_ATTR_MCGROUPS] = { .type = NL_A_NESTED, .optional = true },
1223 struct nlattr *a[ARRAY_SIZE(odp_datapath_policy)];
1224 struct odp_header *odp_header;
1225 struct nlmsghdr *nlmsg;
1226 struct genlmsghdr *genl;
1229 dpif_linux_dp_init(dp);
1231 ofpbuf_use_const(&b, buf->data, buf->size);
1232 nlmsg = ofpbuf_try_pull(&b, sizeof *nlmsg);
1233 genl = ofpbuf_try_pull(&b, sizeof *genl);
1234 odp_header = ofpbuf_try_pull(&b, sizeof *odp_header);
1235 if (!nlmsg || !genl || !odp_header
1236 || nlmsg->nlmsg_type != odp_datapath_family
1237 || !nl_policy_parse(&b, 0, odp_datapath_policy, a,
1238 ARRAY_SIZE(odp_datapath_policy))) {
1242 dp->cmd = genl->cmd;
1243 dp->dp_ifindex = odp_header->dp_ifindex;
1244 dp->name = nl_attr_get_string(a[ODP_DP_ATTR_NAME]);
1245 if (a[ODP_DP_ATTR_STATS]) {
1246 /* Can't use structure assignment because Netlink doesn't ensure
1247 * sufficient alignment for 64-bit members. */
1248 memcpy(&dp->stats, nl_attr_get(a[ODP_DP_ATTR_STATS]),
1251 if (a[ODP_DP_ATTR_IPV4_FRAGS]) {
1252 dp->ipv4_frags = nl_attr_get_u32(a[ODP_DP_ATTR_IPV4_FRAGS]);
1254 if (a[ODP_DP_ATTR_SAMPLING]) {
1255 dp->sampling = nl_attr_get(a[ODP_DP_ATTR_SAMPLING]);
1258 if (a[ODP_DP_ATTR_MCGROUPS]) {
1259 static const struct nl_policy odp_mcgroup_policy[] = {
1260 [ODP_PACKET_CMD_MISS] = { .type = NL_A_U32, .optional = true },
1261 [ODP_PACKET_CMD_ACTION] = { .type = NL_A_U32, .optional = true },
1262 [ODP_PACKET_CMD_SAMPLE] = { .type = NL_A_U32, .optional = true },
1265 struct nlattr *mcgroups[ARRAY_SIZE(odp_mcgroup_policy)];
1267 if (!nl_parse_nested(a[ODP_DP_ATTR_MCGROUPS], odp_mcgroup_policy,
1268 mcgroups, ARRAY_SIZE(odp_mcgroup_policy))) {
1272 if (mcgroups[ODP_PACKET_CMD_MISS]) {
1273 dp->mcgroups[DPIF_UC_MISS]
1274 = nl_attr_get_u32(mcgroups[ODP_PACKET_CMD_MISS]);
1276 if (mcgroups[ODP_PACKET_CMD_ACTION]) {
1277 dp->mcgroups[DPIF_UC_ACTION]
1278 = nl_attr_get_u32(mcgroups[ODP_PACKET_CMD_ACTION]);
1280 if (mcgroups[ODP_PACKET_CMD_SAMPLE]) {
1281 dp->mcgroups[DPIF_UC_SAMPLE]
1282 = nl_attr_get_u32(mcgroups[ODP_PACKET_CMD_SAMPLE]);
1289 /* Appends to 'buf' the Generic Netlink message described by 'dp'. */
1291 dpif_linux_dp_to_ofpbuf(const struct dpif_linux_dp *dp, struct ofpbuf *buf)
1293 struct odp_header *odp_header;
1295 nl_msg_put_genlmsghdr(buf, 0, odp_datapath_family,
1296 NLM_F_REQUEST | NLM_F_ECHO, dp->cmd, 1);
1298 odp_header = ofpbuf_put_uninit(buf, sizeof *odp_header);
1299 odp_header->dp_ifindex = dp->dp_ifindex;
1302 nl_msg_put_string(buf, ODP_DP_ATTR_NAME, dp->name);
1305 /* Skip ODP_DP_ATTR_STATS since we never have a reason to serialize it. */
1307 if (dp->ipv4_frags) {
1308 nl_msg_put_u32(buf, ODP_DP_ATTR_IPV4_FRAGS, dp->ipv4_frags);
1312 nl_msg_put_u32(buf, ODP_DP_ATTR_SAMPLING, *dp->sampling);
1316 /* Clears 'dp' to "empty" values. */
1318 dpif_linux_dp_init(struct dpif_linux_dp *dp)
1320 memset(dp, 0, sizeof *dp);
1324 dpif_linux_dp_dump_start(struct nl_dump *dump)
1326 struct dpif_linux_dp request;
1329 dpif_linux_dp_init(&request);
1330 request.cmd = ODP_DP_CMD_GET;
1332 buf = ofpbuf_new(1024);
1333 dpif_linux_dp_to_ofpbuf(&request, buf);
1334 nl_dump_start(dump, genl_sock, buf);
1338 /* Executes 'request' in the kernel datapath. If the command fails, returns a
1339 * positive errno value. Otherwise, if 'reply' and 'bufp' are null, returns 0
1340 * without doing anything else. If 'reply' and 'bufp' are nonnull, then the
1341 * result of the command is expected to be of the same form, which is decoded
1342 * and stored in '*reply' and '*bufp'. The caller must free '*bufp' when the
1343 * reply is no longer needed ('reply' will contain pointers into '*bufp'). */
1345 dpif_linux_dp_transact(const struct dpif_linux_dp *request,
1346 struct dpif_linux_dp *reply, struct ofpbuf **bufp)
1348 struct ofpbuf *request_buf;
1351 assert((reply != NULL) == (bufp != NULL));
1353 request_buf = ofpbuf_new(1024);
1354 dpif_linux_dp_to_ofpbuf(request, request_buf);
1355 error = nl_sock_transact(genl_sock, request_buf, bufp);
1356 ofpbuf_delete(request_buf);
1360 error = dpif_linux_dp_from_ofpbuf(reply, *bufp);
1363 dpif_linux_dp_init(reply);
1364 ofpbuf_delete(*bufp);
1371 /* Obtains information about 'dpif_' and stores it into '*reply' and '*bufp'.
1372 * The caller must free '*bufp' when the reply is no longer needed ('reply'
1373 * will contain pointers into '*bufp'). */
1375 dpif_linux_dp_get(const struct dpif *dpif_, struct dpif_linux_dp *reply,
1376 struct ofpbuf **bufp)
1378 struct dpif_linux *dpif = dpif_linux_cast(dpif_);
1379 struct dpif_linux_dp request;
1381 dpif_linux_dp_init(&request);
1382 request.cmd = ODP_DP_CMD_GET;
1383 request.dp_ifindex = dpif->dp_ifindex;
1385 return dpif_linux_dp_transact(&request, reply, bufp);
1388 /* Parses the contents of 'buf', which contains a "struct odp_header" followed
1389 * by Netlink attributes, into 'flow'. Returns 0 if successful, otherwise a
1390 * positive errno value.
1392 * 'flow' will contain pointers into 'buf', so the caller should not free 'buf'
1393 * while 'flow' is still in use. */
1395 dpif_linux_flow_from_ofpbuf(struct dpif_linux_flow *flow,
1396 const struct ofpbuf *buf)
1398 static const struct nl_policy odp_flow_policy[] = {
1399 [ODP_FLOW_ATTR_KEY] = { .type = NL_A_NESTED },
1400 [ODP_FLOW_ATTR_ACTIONS] = { .type = NL_A_NESTED, .optional = true },
1401 [ODP_FLOW_ATTR_STATS] = { .type = NL_A_UNSPEC,
1402 .min_len = sizeof(struct odp_flow_stats),
1403 .max_len = sizeof(struct odp_flow_stats),
1405 [ODP_FLOW_ATTR_TCP_FLAGS] = { .type = NL_A_U8, .optional = true },
1406 [ODP_FLOW_ATTR_USED] = { .type = NL_A_U64, .optional = true },
1407 /* The kernel never uses ODP_FLOW_ATTR_CLEAR. */
1410 struct nlattr *a[ARRAY_SIZE(odp_flow_policy)];
1411 struct odp_header *odp_header;
1412 struct nlmsghdr *nlmsg;
1413 struct genlmsghdr *genl;
1416 dpif_linux_flow_init(flow);
1418 ofpbuf_use_const(&b, buf->data, buf->size);
1419 nlmsg = ofpbuf_try_pull(&b, sizeof *nlmsg);
1420 genl = ofpbuf_try_pull(&b, sizeof *genl);
1421 odp_header = ofpbuf_try_pull(&b, sizeof *odp_header);
1422 if (!nlmsg || !genl || !odp_header
1423 || nlmsg->nlmsg_type != odp_flow_family
1424 || !nl_policy_parse(&b, 0, odp_flow_policy, a,
1425 ARRAY_SIZE(odp_flow_policy))) {
1429 flow->nlmsg_flags = nlmsg->nlmsg_flags;
1430 flow->dp_ifindex = odp_header->dp_ifindex;
1431 flow->key = nl_attr_get(a[ODP_FLOW_ATTR_KEY]);
1432 flow->key_len = nl_attr_get_size(a[ODP_FLOW_ATTR_KEY]);
1433 if (a[ODP_FLOW_ATTR_ACTIONS]) {
1434 flow->actions = nl_attr_get(a[ODP_FLOW_ATTR_ACTIONS]);
1435 flow->actions_len = nl_attr_get_size(a[ODP_FLOW_ATTR_ACTIONS]);
1437 if (a[ODP_FLOW_ATTR_STATS]) {
1438 flow->stats = nl_attr_get(a[ODP_FLOW_ATTR_STATS]);
1440 if (a[ODP_FLOW_ATTR_TCP_FLAGS]) {
1441 flow->tcp_flags = nl_attr_get(a[ODP_FLOW_ATTR_TCP_FLAGS]);
1446 /* Appends to 'buf' (which must initially be empty) a "struct odp_header"
1447 * followed by Netlink attributes corresponding to 'flow'. */
1449 dpif_linux_flow_to_ofpbuf(const struct dpif_linux_flow *flow,
1452 struct odp_header *odp_header;
1454 nl_msg_put_genlmsghdr(buf, 0, odp_flow_family,
1455 NLM_F_REQUEST | flow->nlmsg_flags, flow->cmd, 1);
1457 odp_header = ofpbuf_put_uninit(buf, sizeof *odp_header);
1458 odp_header->dp_ifindex = flow->dp_ifindex;
1460 if (flow->key_len) {
1461 nl_msg_put_unspec(buf, ODP_FLOW_ATTR_KEY, flow->key, flow->key_len);
1464 if (flow->actions_len) {
1465 nl_msg_put_unspec(buf, ODP_FLOW_ATTR_ACTIONS,
1466 flow->actions, flow->actions_len);
1469 /* We never need to send these to the kernel. */
1470 assert(!flow->stats);
1471 assert(!flow->tcp_flags);
1472 assert(!flow->used);
1475 nl_msg_put_flag(buf, ODP_FLOW_ATTR_CLEAR);
1479 /* Clears 'flow' to "empty" values. */
1481 dpif_linux_flow_init(struct dpif_linux_flow *flow)
1483 memset(flow, 0, sizeof *flow);
1486 /* Executes 'request' in the kernel datapath. If the command fails, returns a
1487 * positive errno value. Otherwise, if 'reply' and 'bufp' are null, returns 0
1488 * without doing anything else. If 'reply' and 'bufp' are nonnull, then the
1489 * result of the command is expected to be a flow also, which is decoded and
1490 * stored in '*reply' and '*bufp'. The caller must free '*bufp' when the reply
1491 * is no longer needed ('reply' will contain pointers into '*bufp'). */
1493 dpif_linux_flow_transact(const struct dpif_linux_flow *request,
1494 struct dpif_linux_flow *reply, struct ofpbuf **bufp)
1496 struct ofpbuf *request_buf;
1499 assert((reply != NULL) == (bufp != NULL));
1501 request_buf = ofpbuf_new(1024);
1502 dpif_linux_flow_to_ofpbuf(request, request_buf);
1503 error = nl_sock_transact(genl_sock, request_buf, bufp);
1504 ofpbuf_delete(request_buf);
1508 error = dpif_linux_flow_from_ofpbuf(reply, *bufp);
1511 dpif_linux_flow_init(reply);
1512 ofpbuf_delete(*bufp);
1520 dpif_linux_flow_get_stats(const struct dpif_linux_flow *flow,
1521 struct dpif_flow_stats *stats)
1524 stats->n_packets = get_unaligned_u64(&flow->stats->n_packets);
1525 stats->n_bytes = get_unaligned_u64(&flow->stats->n_bytes);
1527 stats->n_packets = 0;
1530 stats->used = flow->used ? get_unaligned_u64(flow->used) : 0;
1531 stats->tcp_flags = flow->tcp_flags ? *flow->tcp_flags : 0;