2 * Copyright (c) 2008, 2009, 2010, 2011, 2012, 2013, 2014 Nicira, Inc.
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"
26 #include <linux/types.h>
27 #include <linux/pkt_sched.h>
31 #include <sys/epoll.h>
36 #include "dpif-provider.h"
37 #include "dynamic-string.h"
39 #include "fat-rwlock.h"
41 #include "netdev-linux.h"
42 #include "netdev-vport.h"
43 #include "netlink-notifier.h"
44 #include "netlink-socket.h"
49 #include "poll-loop.h"
54 #include "unaligned.h"
58 VLOG_DEFINE_THIS_MODULE(dpif_linux);
59 enum { MAX_PORTS = USHRT_MAX };
61 /* This ethtool flag was introduced in Linux 2.6.24, so it might be
62 * missing if we have old headers. */
63 #define ETH_FLAG_LRO (1 << 15) /* LRO is enabled */
65 struct dpif_linux_dp {
66 /* Generic Netlink header. */
69 /* struct ovs_header. */
73 const char *name; /* OVS_DP_ATTR_NAME. */
74 const uint32_t *upcall_pid; /* OVS_DP_ATTR_UPCALL_PID. */
75 uint32_t user_features; /* OVS_DP_ATTR_USER_FEATURES */
76 struct ovs_dp_stats stats; /* OVS_DP_ATTR_STATS. */
77 struct ovs_dp_megaflow_stats megaflow_stats;
78 /* OVS_DP_ATTR_MEGAFLOW_STATS.*/
81 static void dpif_linux_dp_init(struct dpif_linux_dp *);
82 static int dpif_linux_dp_from_ofpbuf(struct dpif_linux_dp *,
83 const struct ofpbuf *);
84 static void dpif_linux_dp_dump_start(struct nl_dump *);
85 static int dpif_linux_dp_transact(const struct dpif_linux_dp *request,
86 struct dpif_linux_dp *reply,
87 struct ofpbuf **bufp);
88 static int dpif_linux_dp_get(const struct dpif *, struct dpif_linux_dp *reply,
89 struct ofpbuf **bufp);
91 struct dpif_linux_flow {
92 /* Generic Netlink header. */
95 /* struct ovs_header. */
96 unsigned int nlmsg_flags;
101 * The 'stats' member points to 64-bit data that might only be aligned on
102 * 32-bit boundaries, so get_unaligned_u64() should be used to access its
105 * If 'actions' is nonnull then OVS_FLOW_ATTR_ACTIONS will be included in
106 * the Netlink version of the command, even if actions_len is zero. */
107 const struct nlattr *key; /* OVS_FLOW_ATTR_KEY. */
109 const struct nlattr *mask; /* OVS_FLOW_ATTR_MASK. */
111 const struct nlattr *actions; /* OVS_FLOW_ATTR_ACTIONS. */
113 const struct ovs_flow_stats *stats; /* OVS_FLOW_ATTR_STATS. */
114 const uint8_t *tcp_flags; /* OVS_FLOW_ATTR_TCP_FLAGS. */
115 const ovs_32aligned_u64 *used; /* OVS_FLOW_ATTR_USED. */
116 bool clear; /* OVS_FLOW_ATTR_CLEAR. */
119 static void dpif_linux_flow_init(struct dpif_linux_flow *);
120 static int dpif_linux_flow_from_ofpbuf(struct dpif_linux_flow *,
121 const struct ofpbuf *);
122 static void dpif_linux_flow_to_ofpbuf(const struct dpif_linux_flow *,
124 static int dpif_linux_flow_transact(struct dpif_linux_flow *request,
125 struct dpif_linux_flow *reply,
126 struct ofpbuf **bufp);
127 static void dpif_linux_flow_get_stats(const struct dpif_linux_flow *,
128 struct dpif_flow_stats *);
130 /* One of the dpif channels between the kernel and userspace. */
131 struct dpif_channel {
132 struct nl_sock *sock; /* Netlink socket. */
133 long long int last_poll; /* Last time this channel was polled. */
136 struct dpif_handler {
137 struct dpif_channel *channels;/* Array of channels for each handler. */
138 struct epoll_event *epoll_events;
139 int epoll_fd; /* epoll fd that includes channel socks. */
140 int n_events; /* Num events returned by epoll_wait(). */
141 int event_offset; /* Offset into 'epoll_events'. */
144 /* Datapath interface for the openvswitch Linux kernel module. */
149 /* Upcall messages. */
150 struct fat_rwlock upcall_lock;
151 struct dpif_handler *handlers;
152 uint32_t n_handlers; /* Num of upcall handlers. */
153 int uc_array_size; /* Size of 'handler->channels' and */
154 /* 'handler->epoll_events'. */
156 /* Change notification. */
157 struct nl_sock *port_notifier; /* vport multicast group subscriber. */
158 bool refresh_channels;
161 static void report_loss(struct dpif_linux *, struct dpif_channel *,
162 uint32_t ch_idx, uint32_t handler_id);
164 static struct vlog_rate_limit error_rl = VLOG_RATE_LIMIT_INIT(9999, 5);
166 /* Generic Netlink family numbers for OVS.
168 * Initialized by dpif_linux_init(). */
169 static int ovs_datapath_family;
170 static int ovs_vport_family;
171 static int ovs_flow_family;
172 static int ovs_packet_family;
174 /* Generic Netlink multicast groups for OVS.
176 * Initialized by dpif_linux_init(). */
177 static unsigned int ovs_vport_mcgroup;
179 static int dpif_linux_init(void);
180 static int open_dpif(const struct dpif_linux_dp *, struct dpif **);
181 static uint32_t dpif_linux_port_get_pid(const struct dpif *,
182 odp_port_t port_no, uint32_t hash);
183 static int dpif_linux_refresh_channels(struct dpif_linux *,
184 uint32_t n_handlers);
185 static void dpif_linux_vport_to_ofpbuf(const struct dpif_linux_vport *,
187 static int dpif_linux_vport_from_ofpbuf(struct dpif_linux_vport *,
188 const struct ofpbuf *);
190 static struct dpif_linux *
191 dpif_linux_cast(const struct dpif *dpif)
193 dpif_assert_class(dpif, &dpif_linux_class);
194 return CONTAINER_OF(dpif, struct dpif_linux, dpif);
198 dpif_linux_enumerate(struct sset *all_dps)
201 uint64_t reply_stub[NL_DUMP_BUFSIZE / 8];
202 struct ofpbuf msg, buf;
205 error = dpif_linux_init();
210 ofpbuf_use_stub(&buf, reply_stub, sizeof reply_stub);
211 dpif_linux_dp_dump_start(&dump);
212 while (nl_dump_next(&dump, &msg, &buf)) {
213 struct dpif_linux_dp dp;
215 if (!dpif_linux_dp_from_ofpbuf(&dp, &msg)) {
216 sset_add(all_dps, dp.name);
220 return nl_dump_done(&dump);
224 dpif_linux_open(const struct dpif_class *class OVS_UNUSED, const char *name,
225 bool create, struct dpif **dpifp)
227 struct dpif_linux_dp dp_request, dp;
232 error = dpif_linux_init();
237 /* Create or look up datapath. */
238 dpif_linux_dp_init(&dp_request);
240 dp_request.cmd = OVS_DP_CMD_NEW;
242 dp_request.upcall_pid = &upcall_pid;
244 /* Use OVS_DP_CMD_SET to report user features */
245 dp_request.cmd = OVS_DP_CMD_SET;
247 dp_request.name = name;
248 dp_request.user_features |= OVS_DP_F_UNALIGNED;
249 dp_request.user_features |= OVS_DP_F_VPORT_PIDS;
250 error = dpif_linux_dp_transact(&dp_request, &dp, &buf);
255 error = open_dpif(&dp, dpifp);
261 open_dpif(const struct dpif_linux_dp *dp, struct dpif **dpifp)
263 struct dpif_linux *dpif;
265 dpif = xzalloc(sizeof *dpif);
266 dpif->port_notifier = NULL;
267 fat_rwlock_init(&dpif->upcall_lock);
269 dpif_init(&dpif->dpif, &dpif_linux_class, dp->name,
270 dp->dp_ifindex, dp->dp_ifindex);
272 dpif->dp_ifindex = dp->dp_ifindex;
273 *dpifp = &dpif->dpif;
278 /* Destroys the netlink sockets pointed by the elements in 'socksp'
279 * and frees the 'socksp'. */
281 vport_del_socksp(struct nl_sock **socksp, uint32_t n_socks)
285 for (i = 0; i < n_socks; i++) {
286 nl_sock_destroy(socksp[i]);
292 /* Creates an array of netlink sockets. Returns an array of the
293 * corresponding pointers. Records the error in 'error'. */
294 static struct nl_sock **
295 vport_create_socksp(uint32_t n_socks, int *error)
297 struct nl_sock **socksp = xzalloc(n_socks * sizeof *socksp);
300 for (i = 0; i < n_socks; i++) {
301 *error = nl_sock_create(NETLINK_GENERIC, &socksp[i]);
310 vport_del_socksp(socksp, n_socks);
315 /* Given the array of pointers to netlink sockets 'socksp', returns
316 * the array of corresponding pids. If the 'socksp' is NULL, returns
317 * a single-element array of value 0. */
319 vport_socksp_to_pids(struct nl_sock **socksp, uint32_t n_socks)
324 pids = xzalloc(sizeof *pids);
328 pids = xzalloc(n_socks * sizeof *pids);
329 for (i = 0; i < n_socks; i++) {
330 pids[i] = nl_sock_pid(socksp[i]);
337 /* Given the port number 'port_idx', extracts the pids of netlink sockets
338 * associated to the port and assigns it to 'upcall_pids'. */
340 vport_get_pids(struct dpif_linux *dpif, uint32_t port_idx,
341 uint32_t **upcall_pids)
346 /* Since the nl_sock can only be assigned in either all
347 * or none "dpif->handlers" channels, the following check
349 if (!dpif->handlers[0].channels[port_idx].sock) {
353 pids = xzalloc(dpif->n_handlers * sizeof *pids);
355 for (i = 0; i < dpif->n_handlers; i++) {
356 pids[i] = nl_sock_pid(dpif->handlers[i].channels[port_idx].sock);
365 vport_add_channels(struct dpif_linux *dpif, odp_port_t port_no,
366 struct nl_sock **socksp)
368 struct epoll_event event;
369 uint32_t port_idx = odp_to_u32(port_no);
373 if (dpif->handlers == NULL) {
377 /* We assume that the datapath densely chooses port numbers, which can
378 * therefore be used as an index into 'channels' and 'epoll_events' of
379 * 'dpif->handler'. */
380 if (port_idx >= dpif->uc_array_size) {
381 uint32_t new_size = port_idx + 1;
383 if (new_size > MAX_PORTS) {
384 VLOG_WARN_RL(&error_rl, "%s: datapath port %"PRIu32" too big",
385 dpif_name(&dpif->dpif), port_no);
389 for (i = 0; i < dpif->n_handlers; i++) {
390 struct dpif_handler *handler = &dpif->handlers[i];
392 handler->channels = xrealloc(handler->channels,
393 new_size * sizeof *handler->channels);
395 for (j = dpif->uc_array_size; j < new_size; j++) {
396 handler->channels[j].sock = NULL;
399 handler->epoll_events = xrealloc(handler->epoll_events,
400 new_size * sizeof *handler->epoll_events);
403 dpif->uc_array_size = new_size;
406 memset(&event, 0, sizeof event);
407 event.events = EPOLLIN;
408 event.data.u32 = port_idx;
410 for (i = 0; i < dpif->n_handlers; i++) {
411 struct dpif_handler *handler = &dpif->handlers[i];
413 if (epoll_ctl(handler->epoll_fd, EPOLL_CTL_ADD, nl_sock_fd(socksp[i]),
418 dpif->handlers[i].channels[port_idx].sock = socksp[i];
419 dpif->handlers[i].channels[port_idx].last_poll = LLONG_MIN;
425 for (j = 0; j < i; j++) {
426 epoll_ctl(dpif->handlers[j].epoll_fd, EPOLL_CTL_DEL,
427 nl_sock_fd(socksp[j]), NULL);
428 dpif->handlers[j].channels[port_idx].sock = NULL;
435 vport_del_channels(struct dpif_linux *dpif, odp_port_t port_no)
437 uint32_t port_idx = odp_to_u32(port_no);
440 if (!dpif->handlers || port_idx >= dpif->uc_array_size) {
444 /* Since the sock can only be assigned in either all or none
445 * of "dpif->handlers" channels, the following check would
447 if (!dpif->handlers[0].channels[port_idx].sock) {
451 for (i = 0; i < dpif->n_handlers; i++) {
452 struct dpif_handler *handler = &dpif->handlers[i];
454 epoll_ctl(handler->epoll_fd, EPOLL_CTL_DEL,
455 nl_sock_fd(handler->channels[port_idx].sock), NULL);
456 nl_sock_destroy(handler->channels[port_idx].sock);
457 handler->channels[port_idx].sock = NULL;
458 handler->event_offset = handler->n_events = 0;
463 destroy_all_channels(struct dpif_linux *dpif) OVS_REQ_WRLOCK(dpif->upcall_lock)
467 if (!dpif->handlers) {
471 for (i = 0; i < dpif->uc_array_size; i++ ) {
472 struct dpif_linux_vport vport_request;
473 uint32_t upcall_pids = 0;
475 /* Since the sock can only be assigned in either all or none
476 * of "dpif->handlers" channels, the following check would
478 if (!dpif->handlers[0].channels[i].sock) {
482 /* Turn off upcalls. */
483 dpif_linux_vport_init(&vport_request);
484 vport_request.cmd = OVS_VPORT_CMD_SET;
485 vport_request.dp_ifindex = dpif->dp_ifindex;
486 vport_request.port_no = u32_to_odp(i);
487 vport_request.upcall_pids = &upcall_pids;
488 dpif_linux_vport_transact(&vport_request, NULL, NULL);
490 vport_del_channels(dpif, u32_to_odp(i));
493 for (i = 0; i < dpif->n_handlers; i++) {
494 struct dpif_handler *handler = &dpif->handlers[i];
496 close(handler->epoll_fd);
497 free(handler->epoll_events);
498 free(handler->channels);
501 free(dpif->handlers);
502 dpif->handlers = NULL;
503 dpif->n_handlers = 0;
504 dpif->uc_array_size = 0;
508 dpif_linux_close(struct dpif *dpif_)
510 struct dpif_linux *dpif = dpif_linux_cast(dpif_);
512 nl_sock_destroy(dpif->port_notifier);
514 fat_rwlock_wrlock(&dpif->upcall_lock);
515 destroy_all_channels(dpif);
516 fat_rwlock_unlock(&dpif->upcall_lock);
518 fat_rwlock_destroy(&dpif->upcall_lock);
523 dpif_linux_destroy(struct dpif *dpif_)
525 struct dpif_linux *dpif = dpif_linux_cast(dpif_);
526 struct dpif_linux_dp dp;
528 dpif_linux_dp_init(&dp);
529 dp.cmd = OVS_DP_CMD_DEL;
530 dp.dp_ifindex = dpif->dp_ifindex;
531 return dpif_linux_dp_transact(&dp, NULL, NULL);
535 dpif_linux_run(struct dpif *dpif_)
537 struct dpif_linux *dpif = dpif_linux_cast(dpif_);
539 if (dpif->refresh_channels) {
540 dpif->refresh_channels = false;
541 fat_rwlock_wrlock(&dpif->upcall_lock);
542 dpif_linux_refresh_channels(dpif, dpif->n_handlers);
543 fat_rwlock_unlock(&dpif->upcall_lock);
548 dpif_linux_get_stats(const struct dpif *dpif_, struct dpif_dp_stats *stats)
550 struct dpif_linux_dp dp;
554 error = dpif_linux_dp_get(dpif_, &dp, &buf);
556 stats->n_hit = dp.stats.n_hit;
557 stats->n_missed = dp.stats.n_missed;
558 stats->n_lost = dp.stats.n_lost;
559 stats->n_flows = dp.stats.n_flows;
560 stats->n_masks = dp.megaflow_stats.n_masks;
561 stats->n_mask_hit = dp.megaflow_stats.n_mask_hit;
568 get_vport_type(const struct dpif_linux_vport *vport)
570 static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(5, 20);
572 switch (vport->type) {
573 case OVS_VPORT_TYPE_NETDEV: {
574 const char *type = netdev_get_type_from_name(vport->name);
576 return type ? type : "system";
579 case OVS_VPORT_TYPE_INTERNAL:
582 case OVS_VPORT_TYPE_GRE:
585 case OVS_VPORT_TYPE_GRE64:
588 case OVS_VPORT_TYPE_VXLAN:
591 case OVS_VPORT_TYPE_LISP:
594 case OVS_VPORT_TYPE_UNSPEC:
595 case __OVS_VPORT_TYPE_MAX:
599 VLOG_WARN_RL(&rl, "dp%d: port `%s' has unsupported type %u",
600 vport->dp_ifindex, vport->name, (unsigned int) vport->type);
604 static enum ovs_vport_type
605 netdev_to_ovs_vport_type(const struct netdev *netdev)
607 const char *type = netdev_get_type(netdev);
609 if (!strcmp(type, "tap") || !strcmp(type, "system")) {
610 return OVS_VPORT_TYPE_NETDEV;
611 } else if (!strcmp(type, "internal")) {
612 return OVS_VPORT_TYPE_INTERNAL;
613 } else if (strstr(type, "gre64")) {
614 return OVS_VPORT_TYPE_GRE64;
615 } else if (strstr(type, "gre")) {
616 return OVS_VPORT_TYPE_GRE;
617 } else if (!strcmp(type, "vxlan")) {
618 return OVS_VPORT_TYPE_VXLAN;
619 } else if (!strcmp(type, "lisp")) {
620 return OVS_VPORT_TYPE_LISP;
622 return OVS_VPORT_TYPE_UNSPEC;
627 dpif_linux_port_add__(struct dpif_linux *dpif, struct netdev *netdev,
628 odp_port_t *port_nop)
629 OVS_REQ_WRLOCK(dpif->upcall_lock)
631 const struct netdev_tunnel_config *tnl_cfg;
632 char namebuf[NETDEV_VPORT_NAME_BUFSIZE];
633 const char *name = netdev_vport_get_dpif_port(netdev,
634 namebuf, sizeof namebuf);
635 const char *type = netdev_get_type(netdev);
636 struct dpif_linux_vport request, reply;
638 uint64_t options_stub[64 / 8];
639 struct ofpbuf options;
640 struct nl_sock **socksp = NULL;
641 uint32_t *upcall_pids;
644 if (dpif->handlers) {
645 socksp = vport_create_socksp(dpif->n_handlers, &error);
651 dpif_linux_vport_init(&request);
652 request.cmd = OVS_VPORT_CMD_NEW;
653 request.dp_ifindex = dpif->dp_ifindex;
654 request.type = netdev_to_ovs_vport_type(netdev);
655 if (request.type == OVS_VPORT_TYPE_UNSPEC) {
656 VLOG_WARN_RL(&error_rl, "%s: cannot create port `%s' because it has "
657 "unsupported type `%s'",
658 dpif_name(&dpif->dpif), name, type);
659 vport_del_socksp(socksp, dpif->n_handlers);
664 if (request.type == OVS_VPORT_TYPE_NETDEV) {
665 netdev_linux_ethtool_set_flag(netdev, ETH_FLAG_LRO, "LRO", false);
668 tnl_cfg = netdev_get_tunnel_config(netdev);
669 if (tnl_cfg && tnl_cfg->dst_port != 0) {
670 ofpbuf_use_stack(&options, options_stub, sizeof options_stub);
671 nl_msg_put_u16(&options, OVS_TUNNEL_ATTR_DST_PORT,
672 ntohs(tnl_cfg->dst_port));
673 request.options = ofpbuf_data(&options);
674 request.options_len = ofpbuf_size(&options);
677 request.port_no = *port_nop;
678 upcall_pids = vport_socksp_to_pids(socksp, dpif->n_handlers);
679 request.n_upcall_pids = socksp ? dpif->n_handlers : 1;
680 request.upcall_pids = upcall_pids;
682 error = dpif_linux_vport_transact(&request, &reply, &buf);
684 *port_nop = reply.port_no;
686 if (error == EBUSY && *port_nop != ODPP_NONE) {
687 VLOG_INFO("%s: requested port %"PRIu32" is in use",
688 dpif_name(&dpif->dpif), *port_nop);
691 vport_del_socksp(socksp, dpif->n_handlers);
696 error = vport_add_channels(dpif, *port_nop, socksp);
698 VLOG_INFO("%s: could not add channel for port %s",
699 dpif_name(&dpif->dpif), name);
701 /* Delete the port. */
702 dpif_linux_vport_init(&request);
703 request.cmd = OVS_VPORT_CMD_DEL;
704 request.dp_ifindex = dpif->dp_ifindex;
705 request.port_no = *port_nop;
706 dpif_linux_vport_transact(&request, NULL, NULL);
707 vport_del_socksp(socksp, dpif->n_handlers);
721 dpif_linux_port_add(struct dpif *dpif_, struct netdev *netdev,
722 odp_port_t *port_nop)
724 struct dpif_linux *dpif = dpif_linux_cast(dpif_);
727 fat_rwlock_wrlock(&dpif->upcall_lock);
728 error = dpif_linux_port_add__(dpif, netdev, port_nop);
729 fat_rwlock_unlock(&dpif->upcall_lock);
735 dpif_linux_port_del__(struct dpif_linux *dpif, odp_port_t port_no)
736 OVS_REQ_WRLOCK(dpif->upcall_lock)
738 struct dpif_linux_vport vport;
741 dpif_linux_vport_init(&vport);
742 vport.cmd = OVS_VPORT_CMD_DEL;
743 vport.dp_ifindex = dpif->dp_ifindex;
744 vport.port_no = port_no;
745 error = dpif_linux_vport_transact(&vport, NULL, NULL);
747 vport_del_channels(dpif, port_no);
753 dpif_linux_port_del(struct dpif *dpif_, odp_port_t port_no)
755 struct dpif_linux *dpif = dpif_linux_cast(dpif_);
758 fat_rwlock_wrlock(&dpif->upcall_lock);
759 error = dpif_linux_port_del__(dpif, port_no);
760 fat_rwlock_unlock(&dpif->upcall_lock);
766 dpif_linux_port_query__(const struct dpif_linux *dpif, odp_port_t port_no,
767 const char *port_name, struct dpif_port *dpif_port)
769 struct dpif_linux_vport request;
770 struct dpif_linux_vport reply;
774 dpif_linux_vport_init(&request);
775 request.cmd = OVS_VPORT_CMD_GET;
776 request.dp_ifindex = dpif->dp_ifindex;
777 request.port_no = port_no;
778 request.name = port_name;
780 error = dpif_linux_vport_transact(&request, &reply, &buf);
782 if (reply.dp_ifindex != request.dp_ifindex) {
783 /* A query by name reported that 'port_name' is in some datapath
784 * other than 'dpif', but the caller wants to know about 'dpif'. */
786 } else if (dpif_port) {
787 dpif_port->name = xstrdup(reply.name);
788 dpif_port->type = xstrdup(get_vport_type(&reply));
789 dpif_port->port_no = reply.port_no;
797 dpif_linux_port_query_by_number(const struct dpif *dpif_, odp_port_t port_no,
798 struct dpif_port *dpif_port)
800 struct dpif_linux *dpif = dpif_linux_cast(dpif_);
802 return dpif_linux_port_query__(dpif, port_no, NULL, dpif_port);
806 dpif_linux_port_query_by_name(const struct dpif *dpif_, const char *devname,
807 struct dpif_port *dpif_port)
809 struct dpif_linux *dpif = dpif_linux_cast(dpif_);
811 return dpif_linux_port_query__(dpif, 0, devname, dpif_port);
815 dpif_linux_port_get_pid__(const struct dpif_linux *dpif, odp_port_t port_no,
817 OVS_REQ_RDLOCK(dpif->upcall_lock)
819 uint32_t port_idx = odp_to_u32(port_no);
822 if (dpif->handlers) {
823 /* The ODPP_NONE "reserved" port number uses the "ovs-system"'s
824 * channel, since it is not heavily loaded. */
825 uint32_t idx = port_idx >= dpif->uc_array_size ? 0 : port_idx;
826 struct dpif_handler *h = &dpif->handlers[hash % dpif->n_handlers];
828 pid = nl_sock_pid(h->channels[idx].sock);
835 dpif_linux_port_get_pid(const struct dpif *dpif_, odp_port_t port_no,
838 const struct dpif_linux *dpif = dpif_linux_cast(dpif_);
841 fat_rwlock_rdlock(&dpif->upcall_lock);
842 ret = dpif_linux_port_get_pid__(dpif, port_no, hash);
843 fat_rwlock_unlock(&dpif->upcall_lock);
849 dpif_linux_flow_flush(struct dpif *dpif_)
851 const struct dpif_linux *dpif = dpif_linux_cast(dpif_);
852 struct dpif_linux_flow flow;
854 dpif_linux_flow_init(&flow);
855 flow.cmd = OVS_FLOW_CMD_DEL;
856 flow.dp_ifindex = dpif->dp_ifindex;
857 return dpif_linux_flow_transact(&flow, NULL, NULL);
860 struct dpif_linux_port_state {
866 dpif_linux_port_dump_start__(const struct dpif_linux *dpif,
867 struct nl_dump *dump)
869 struct dpif_linux_vport request;
872 dpif_linux_vport_init(&request);
873 request.cmd = OVS_VPORT_CMD_GET;
874 request.dp_ifindex = dpif->dp_ifindex;
876 buf = ofpbuf_new(1024);
877 dpif_linux_vport_to_ofpbuf(&request, buf);
878 nl_dump_start(dump, NETLINK_GENERIC, buf);
883 dpif_linux_port_dump_start(const struct dpif *dpif_, void **statep)
885 struct dpif_linux *dpif = dpif_linux_cast(dpif_);
886 struct dpif_linux_port_state *state;
888 *statep = state = xmalloc(sizeof *state);
889 dpif_linux_port_dump_start__(dpif, &state->dump);
891 ofpbuf_init(&state->buf, NL_DUMP_BUFSIZE);
896 dpif_linux_port_dump_next__(const struct dpif_linux *dpif, struct nl_dump *dump,
897 struct dpif_linux_vport *vport,
898 struct ofpbuf *buffer)
903 if (!nl_dump_next(dump, &buf, buffer)) {
907 error = dpif_linux_vport_from_ofpbuf(vport, &buf);
909 VLOG_WARN_RL(&error_rl, "%s: failed to parse vport record (%s)",
910 dpif_name(&dpif->dpif), ovs_strerror(error));
916 dpif_linux_port_dump_next(const struct dpif *dpif_, void *state_,
917 struct dpif_port *dpif_port)
919 struct dpif_linux *dpif = dpif_linux_cast(dpif_);
920 struct dpif_linux_port_state *state = state_;
921 struct dpif_linux_vport vport;
924 error = dpif_linux_port_dump_next__(dpif, &state->dump, &vport,
929 dpif_port->name = CONST_CAST(char *, vport.name);
930 dpif_port->type = CONST_CAST(char *, get_vport_type(&vport));
931 dpif_port->port_no = vport.port_no;
936 dpif_linux_port_dump_done(const struct dpif *dpif_ OVS_UNUSED, void *state_)
938 struct dpif_linux_port_state *state = state_;
939 int error = nl_dump_done(&state->dump);
941 ofpbuf_uninit(&state->buf);
947 dpif_linux_port_poll(const struct dpif *dpif_, char **devnamep)
949 struct dpif_linux *dpif = dpif_linux_cast(dpif_);
951 /* Lazily create the Netlink socket to listen for notifications. */
952 if (!dpif->port_notifier) {
953 struct nl_sock *sock;
956 error = nl_sock_create(NETLINK_GENERIC, &sock);
961 error = nl_sock_join_mcgroup(sock, ovs_vport_mcgroup);
963 nl_sock_destroy(sock);
966 dpif->port_notifier = sock;
968 /* We have no idea of the current state so report that everything
974 static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 5);
975 uint64_t buf_stub[4096 / 8];
979 ofpbuf_use_stub(&buf, buf_stub, sizeof buf_stub);
980 error = nl_sock_recv(dpif->port_notifier, &buf, false);
982 struct dpif_linux_vport vport;
984 error = dpif_linux_vport_from_ofpbuf(&vport, &buf);
986 if (vport.dp_ifindex == dpif->dp_ifindex
987 && (vport.cmd == OVS_VPORT_CMD_NEW
988 || vport.cmd == OVS_VPORT_CMD_DEL
989 || vport.cmd == OVS_VPORT_CMD_SET)) {
990 VLOG_DBG("port_changed: dpif:%s vport:%s cmd:%"PRIu8,
991 dpif->dpif.full_name, vport.name, vport.cmd);
992 if (vport.cmd == OVS_VPORT_CMD_DEL && dpif->handlers) {
993 dpif->refresh_channels = true;
995 *devnamep = xstrdup(vport.name);
1000 } else if (error != EAGAIN) {
1001 VLOG_WARN_RL(&rl, "error reading or parsing netlink (%s)",
1002 ovs_strerror(error));
1003 nl_sock_drain(dpif->port_notifier);
1007 ofpbuf_uninit(&buf);
1015 dpif_linux_port_poll_wait(const struct dpif *dpif_)
1017 const struct dpif_linux *dpif = dpif_linux_cast(dpif_);
1019 if (dpif->port_notifier) {
1020 nl_sock_wait(dpif->port_notifier, POLLIN);
1022 poll_immediate_wake();
1027 dpif_linux_flow_get__(const struct dpif_linux *dpif,
1028 const struct nlattr *key, size_t key_len,
1029 struct dpif_linux_flow *reply, struct ofpbuf **bufp)
1031 struct dpif_linux_flow request;
1033 dpif_linux_flow_init(&request);
1034 request.cmd = OVS_FLOW_CMD_GET;
1035 request.dp_ifindex = dpif->dp_ifindex;
1037 request.key_len = key_len;
1038 return dpif_linux_flow_transact(&request, reply, bufp);
1042 dpif_linux_flow_get(const struct dpif *dpif_,
1043 const struct nlattr *key, size_t key_len,
1044 struct ofpbuf **actionsp, struct dpif_flow_stats *stats)
1046 const struct dpif_linux *dpif = dpif_linux_cast(dpif_);
1047 struct dpif_linux_flow reply;
1051 error = dpif_linux_flow_get__(dpif, key, key_len, &reply, &buf);
1054 dpif_linux_flow_get_stats(&reply, stats);
1057 ofpbuf_set_data(buf, CONST_CAST(struct nlattr *, reply.actions));
1058 ofpbuf_set_size(buf, reply.actions_len);
1068 dpif_linux_init_flow_put(struct dpif_linux *dpif, const struct dpif_flow_put *put,
1069 struct dpif_linux_flow *request)
1071 static const struct nlattr dummy_action;
1073 dpif_linux_flow_init(request);
1074 request->cmd = (put->flags & DPIF_FP_CREATE
1075 ? OVS_FLOW_CMD_NEW : OVS_FLOW_CMD_SET);
1076 request->dp_ifindex = dpif->dp_ifindex;
1077 request->key = put->key;
1078 request->key_len = put->key_len;
1079 request->mask = put->mask;
1080 request->mask_len = put->mask_len;
1081 /* Ensure that OVS_FLOW_ATTR_ACTIONS will always be included. */
1082 request->actions = (put->actions
1084 : CONST_CAST(struct nlattr *, &dummy_action));
1085 request->actions_len = put->actions_len;
1086 if (put->flags & DPIF_FP_ZERO_STATS) {
1087 request->clear = true;
1089 request->nlmsg_flags = put->flags & DPIF_FP_MODIFY ? 0 : NLM_F_CREATE;
1093 dpif_linux_flow_put(struct dpif *dpif_, const struct dpif_flow_put *put)
1095 struct dpif_linux *dpif = dpif_linux_cast(dpif_);
1096 struct dpif_linux_flow request, reply;
1100 dpif_linux_init_flow_put(dpif, put, &request);
1101 error = dpif_linux_flow_transact(&request,
1102 put->stats ? &reply : NULL,
1103 put->stats ? &buf : NULL);
1104 if (!error && put->stats) {
1105 dpif_linux_flow_get_stats(&reply, put->stats);
1112 dpif_linux_init_flow_del(struct dpif_linux *dpif, const struct dpif_flow_del *del,
1113 struct dpif_linux_flow *request)
1115 dpif_linux_flow_init(request);
1116 request->cmd = OVS_FLOW_CMD_DEL;
1117 request->dp_ifindex = dpif->dp_ifindex;
1118 request->key = del->key;
1119 request->key_len = del->key_len;
1123 dpif_linux_flow_del(struct dpif *dpif_, const struct dpif_flow_del *del)
1125 struct dpif_linux *dpif = dpif_linux_cast(dpif_);
1126 struct dpif_linux_flow request, reply;
1130 dpif_linux_init_flow_del(dpif, del, &request);
1131 error = dpif_linux_flow_transact(&request,
1132 del->stats ? &reply : NULL,
1133 del->stats ? &buf : NULL);
1134 if (!error && del->stats) {
1135 dpif_linux_flow_get_stats(&reply, del->stats);
1141 struct dpif_linux_flow_state {
1142 struct dpif_linux_flow flow;
1143 struct dpif_flow_stats stats;
1144 struct ofpbuf buffer; /* Always used to store flows. */
1145 struct ofpbuf *tmp; /* Used if kernel does not supply actions. */
1148 struct dpif_linux_flow_iter {
1149 struct nl_dump dump;
1154 dpif_linux_flow_dump_state_init(void **statep)
1156 struct dpif_linux_flow_state *state;
1158 *statep = state = xmalloc(sizeof *state);
1159 ofpbuf_init(&state->buffer, NL_DUMP_BUFSIZE);
1164 dpif_linux_flow_dump_state_uninit(void *state_)
1166 struct dpif_linux_flow_state *state = state_;
1168 ofpbuf_uninit(&state->buffer);
1169 ofpbuf_delete(state->tmp);
1174 dpif_linux_flow_dump_start(const struct dpif *dpif_, void **iterp)
1176 const struct dpif_linux *dpif = dpif_linux_cast(dpif_);
1177 struct dpif_linux_flow_iter *iter;
1178 struct dpif_linux_flow request;
1181 *iterp = iter = xmalloc(sizeof *iter);
1183 dpif_linux_flow_init(&request);
1184 request.cmd = OVS_FLOW_CMD_GET;
1185 request.dp_ifindex = dpif->dp_ifindex;
1187 buf = ofpbuf_new(1024);
1188 dpif_linux_flow_to_ofpbuf(&request, buf);
1189 nl_dump_start(&iter->dump, NETLINK_GENERIC, buf);
1191 atomic_init(&iter->status, 0);
1197 dpif_linux_flow_dump_next(const struct dpif *dpif_, void *iter_, void *state_,
1198 const struct nlattr **key, size_t *key_len,
1199 const struct nlattr **mask, size_t *mask_len,
1200 const struct nlattr **actions, size_t *actions_len,
1201 const struct dpif_flow_stats **stats)
1203 const struct dpif_linux *dpif = dpif_linux_cast(dpif_);
1204 struct dpif_linux_flow_iter *iter = iter_;
1205 struct dpif_linux_flow_state *state = state_;
1210 ofpbuf_delete(state->tmp);
1213 if (!nl_dump_next(&iter->dump, &buf, &state->buffer)) {
1217 error = dpif_linux_flow_from_ofpbuf(&state->flow, &buf);
1219 atomic_store(&iter->status, error);
1223 if (actions && !state->flow.actions) {
1224 error = dpif_linux_flow_get__(dpif, state->flow.key,
1225 state->flow.key_len,
1226 &state->flow, &state->tmp);
1227 if (error == ENOENT) {
1228 VLOG_DBG("dumped flow disappeared on get");
1230 VLOG_WARN("error fetching dumped flow: %s",
1231 ovs_strerror(error));
1237 *actions = state->flow.actions;
1238 *actions_len = state->flow.actions_len;
1241 *key = state->flow.key;
1242 *key_len = state->flow.key_len;
1245 *mask = state->flow.mask;
1246 *mask_len = state->flow.mask ? state->flow.mask_len : 0;
1249 dpif_linux_flow_get_stats(&state->flow, &state->stats);
1250 *stats = &state->stats;
1256 dpif_linux_flow_dump_next_may_destroy_keys(void *state_)
1258 struct dpif_linux_flow_state *state = state_;
1260 return ofpbuf_size(&state->buffer) ? false : true;
1264 dpif_linux_flow_dump_done(const struct dpif *dpif OVS_UNUSED, void *iter_)
1266 struct dpif_linux_flow_iter *iter = iter_;
1268 unsigned int nl_status = nl_dump_done(&iter->dump);
1270 atomic_read(&iter->status, &dump_status);
1272 return dump_status ? dump_status : nl_status;
1276 dpif_linux_encode_execute(int dp_ifindex, const struct dpif_execute *d_exec,
1279 struct ovs_header *k_exec;
1282 ofpbuf_prealloc_tailroom(buf, (64
1283 + ofpbuf_size(d_exec->packet)
1284 + ODP_KEY_METADATA_SIZE
1285 + d_exec->actions_len));
1287 nl_msg_put_genlmsghdr(buf, 0, ovs_packet_family, NLM_F_REQUEST,
1288 OVS_PACKET_CMD_EXECUTE, OVS_PACKET_VERSION);
1290 k_exec = ofpbuf_put_uninit(buf, sizeof *k_exec);
1291 k_exec->dp_ifindex = dp_ifindex;
1293 nl_msg_put_unspec(buf, OVS_PACKET_ATTR_PACKET,
1294 ofpbuf_data(d_exec->packet),
1295 ofpbuf_size(d_exec->packet));
1297 key_ofs = nl_msg_start_nested(buf, OVS_PACKET_ATTR_KEY);
1298 odp_key_from_pkt_metadata(buf, &d_exec->md);
1299 nl_msg_end_nested(buf, key_ofs);
1301 nl_msg_put_unspec(buf, OVS_PACKET_ATTR_ACTIONS,
1302 d_exec->actions, d_exec->actions_len);
1306 dpif_linux_execute__(int dp_ifindex, const struct dpif_execute *execute)
1308 uint64_t request_stub[1024 / 8];
1309 struct ofpbuf request;
1312 ofpbuf_use_stub(&request, request_stub, sizeof request_stub);
1313 dpif_linux_encode_execute(dp_ifindex, execute, &request);
1314 error = nl_transact(NETLINK_GENERIC, &request, NULL);
1315 ofpbuf_uninit(&request);
1321 dpif_linux_execute(struct dpif *dpif_, struct dpif_execute *execute)
1323 const struct dpif_linux *dpif = dpif_linux_cast(dpif_);
1325 return dpif_linux_execute__(dpif->dp_ifindex, execute);
1331 dpif_linux_operate__(struct dpif_linux *dpif, struct dpif_op **ops, size_t n_ops)
1335 struct nl_transaction txn;
1337 struct ofpbuf request;
1338 uint64_t request_stub[1024 / 8];
1340 struct ofpbuf reply;
1341 uint64_t reply_stub[1024 / 8];
1344 struct nl_transaction *txnsp[MAX_OPS];
1347 ovs_assert(n_ops <= MAX_OPS);
1348 for (i = 0; i < n_ops; i++) {
1349 struct op_auxdata *aux = &auxes[i];
1350 struct dpif_op *op = ops[i];
1351 struct dpif_flow_put *put;
1352 struct dpif_flow_del *del;
1353 struct dpif_execute *execute;
1354 struct dpif_linux_flow flow;
1356 ofpbuf_use_stub(&aux->request,
1357 aux->request_stub, sizeof aux->request_stub);
1358 aux->txn.request = &aux->request;
1360 ofpbuf_use_stub(&aux->reply, aux->reply_stub, sizeof aux->reply_stub);
1361 aux->txn.reply = NULL;
1364 case DPIF_OP_FLOW_PUT:
1365 put = &op->u.flow_put;
1366 dpif_linux_init_flow_put(dpif, put, &flow);
1368 flow.nlmsg_flags |= NLM_F_ECHO;
1369 aux->txn.reply = &aux->reply;
1371 dpif_linux_flow_to_ofpbuf(&flow, &aux->request);
1374 case DPIF_OP_FLOW_DEL:
1375 del = &op->u.flow_del;
1376 dpif_linux_init_flow_del(dpif, del, &flow);
1378 flow.nlmsg_flags |= NLM_F_ECHO;
1379 aux->txn.reply = &aux->reply;
1381 dpif_linux_flow_to_ofpbuf(&flow, &aux->request);
1384 case DPIF_OP_EXECUTE:
1385 execute = &op->u.execute;
1386 dpif_linux_encode_execute(dpif->dp_ifindex, execute,
1395 for (i = 0; i < n_ops; i++) {
1396 txnsp[i] = &auxes[i].txn;
1398 nl_transact_multiple(NETLINK_GENERIC, txnsp, n_ops);
1400 for (i = 0; i < n_ops; i++) {
1401 struct op_auxdata *aux = &auxes[i];
1402 struct nl_transaction *txn = &auxes[i].txn;
1403 struct dpif_op *op = ops[i];
1404 struct dpif_flow_put *put;
1405 struct dpif_flow_del *del;
1407 op->error = txn->error;
1410 case DPIF_OP_FLOW_PUT:
1411 put = &op->u.flow_put;
1414 struct dpif_linux_flow reply;
1416 op->error = dpif_linux_flow_from_ofpbuf(&reply,
1419 dpif_linux_flow_get_stats(&reply, put->stats);
1424 memset(put->stats, 0, sizeof *put->stats);
1429 case DPIF_OP_FLOW_DEL:
1430 del = &op->u.flow_del;
1433 struct dpif_linux_flow reply;
1435 op->error = dpif_linux_flow_from_ofpbuf(&reply,
1438 dpif_linux_flow_get_stats(&reply, del->stats);
1443 memset(del->stats, 0, sizeof *del->stats);
1448 case DPIF_OP_EXECUTE:
1455 ofpbuf_uninit(&aux->request);
1456 ofpbuf_uninit(&aux->reply);
1461 dpif_linux_operate(struct dpif *dpif_, struct dpif_op **ops, size_t n_ops)
1463 struct dpif_linux *dpif = dpif_linux_cast(dpif_);
1466 size_t chunk = MIN(n_ops, MAX_OPS);
1467 dpif_linux_operate__(dpif, ops, chunk);
1473 /* Synchronizes 'channels' in 'dpif->handlers' with the set of vports
1474 * currently in 'dpif' in the kernel, by adding a new set of channels for
1475 * any kernel vport that lacks one and deleting any channels that have no
1476 * backing kernel vports. */
1478 dpif_linux_refresh_channels(struct dpif_linux *dpif, uint32_t n_handlers)
1479 OVS_REQ_WRLOCK(dpif->upcall_lock)
1481 unsigned long int *keep_channels;
1482 struct dpif_linux_vport vport;
1483 size_t keep_channels_nbits;
1484 struct nl_dump dump;
1485 uint64_t reply_stub[NL_DUMP_BUFSIZE / 8];
1490 if (dpif->n_handlers != n_handlers) {
1491 destroy_all_channels(dpif);
1492 dpif->handlers = xzalloc(n_handlers * sizeof *dpif->handlers);
1493 for (i = 0; i < n_handlers; i++) {
1494 struct dpif_handler *handler = &dpif->handlers[i];
1496 handler->epoll_fd = epoll_create(10);
1497 if (handler->epoll_fd < 0) {
1500 for (j = 0; j < i; j++) {
1501 close(dpif->handlers[j].epoll_fd);
1503 free(dpif->handlers);
1504 dpif->handlers = NULL;
1509 dpif->n_handlers = n_handlers;
1512 for (i = 0; i < n_handlers; i++) {
1513 struct dpif_handler *handler = &dpif->handlers[i];
1515 handler->event_offset = handler->n_events = 0;
1518 keep_channels_nbits = dpif->uc_array_size;
1519 keep_channels = bitmap_allocate(keep_channels_nbits);
1521 ofpbuf_use_stub(&buf, reply_stub, sizeof reply_stub);
1522 dpif_linux_port_dump_start__(dpif, &dump);
1523 while (!dpif_linux_port_dump_next__(dpif, &dump, &vport, &buf)) {
1524 uint32_t port_no = odp_to_u32(vport.port_no);
1525 uint32_t *upcall_pids = NULL;
1528 if (port_no >= dpif->uc_array_size
1529 || !vport_get_pids(dpif, port_no, &upcall_pids)) {
1530 struct nl_sock **socksp = vport_create_socksp(dpif->n_handlers,
1537 error = vport_add_channels(dpif, vport.port_no, socksp);
1539 VLOG_INFO("%s: could not add channels for port %s",
1540 dpif_name(&dpif->dpif), vport.name);
1541 vport_del_socksp(socksp, dpif->n_handlers);
1545 upcall_pids = vport_socksp_to_pids(socksp, dpif->n_handlers);
1549 /* Configure the vport to deliver misses to 'sock'. */
1550 if (vport.upcall_pids[0] == 0
1551 || vport.n_upcall_pids != dpif->n_handlers
1552 || memcmp(upcall_pids, vport.upcall_pids, n_handlers * sizeof
1554 struct dpif_linux_vport vport_request;
1556 dpif_linux_vport_init(&vport_request);
1557 vport_request.cmd = OVS_VPORT_CMD_SET;
1558 vport_request.dp_ifindex = dpif->dp_ifindex;
1559 vport_request.port_no = vport.port_no;
1560 vport_request.n_upcall_pids = dpif->n_handlers;
1561 vport_request.upcall_pids = upcall_pids;
1562 error = dpif_linux_vport_transact(&vport_request, NULL, NULL);
1564 VLOG_WARN_RL(&error_rl,
1565 "%s: failed to set upcall pid on port: %s",
1566 dpif_name(&dpif->dpif), ovs_strerror(error));
1568 if (error != ENODEV && error != ENOENT) {
1571 /* The vport isn't really there, even though the dump says
1572 * it is. Probably we just hit a race after a port
1579 if (port_no < keep_channels_nbits) {
1580 bitmap_set1(keep_channels, port_no);
1587 vport_del_channels(dpif, vport.port_no);
1589 nl_dump_done(&dump);
1590 ofpbuf_uninit(&buf);
1592 /* Discard any saved channels that we didn't reuse. */
1593 for (i = 0; i < keep_channels_nbits; i++) {
1594 if (!bitmap_is_set(keep_channels, i)) {
1595 vport_del_channels(dpif, u32_to_odp(i));
1598 free(keep_channels);
1604 dpif_linux_recv_set__(struct dpif_linux *dpif, bool enable)
1605 OVS_REQ_WRLOCK(dpif->upcall_lock)
1607 if ((dpif->handlers != NULL) == enable) {
1609 } else if (!enable) {
1610 destroy_all_channels(dpif);
1613 return dpif_linux_refresh_channels(dpif, 1);
1618 dpif_linux_recv_set(struct dpif *dpif_, bool enable)
1620 struct dpif_linux *dpif = dpif_linux_cast(dpif_);
1623 fat_rwlock_wrlock(&dpif->upcall_lock);
1624 error = dpif_linux_recv_set__(dpif, enable);
1625 fat_rwlock_unlock(&dpif->upcall_lock);
1631 dpif_linux_handlers_set(struct dpif *dpif_, uint32_t n_handlers)
1633 struct dpif_linux *dpif = dpif_linux_cast(dpif_);
1636 fat_rwlock_wrlock(&dpif->upcall_lock);
1637 if (dpif->handlers) {
1638 error = dpif_linux_refresh_channels(dpif, n_handlers);
1640 fat_rwlock_unlock(&dpif->upcall_lock);
1646 dpif_linux_queue_to_priority(const struct dpif *dpif OVS_UNUSED,
1647 uint32_t queue_id, uint32_t *priority)
1649 if (queue_id < 0xf000) {
1650 *priority = TC_H_MAKE(1 << 16, queue_id + 1);
1658 parse_odp_packet(struct ofpbuf *buf, struct dpif_upcall *upcall,
1661 static const struct nl_policy ovs_packet_policy[] = {
1662 /* Always present. */
1663 [OVS_PACKET_ATTR_PACKET] = { .type = NL_A_UNSPEC,
1664 .min_len = ETH_HEADER_LEN },
1665 [OVS_PACKET_ATTR_KEY] = { .type = NL_A_NESTED },
1667 /* OVS_PACKET_CMD_ACTION only. */
1668 [OVS_PACKET_ATTR_USERDATA] = { .type = NL_A_UNSPEC, .optional = true },
1671 struct ovs_header *ovs_header;
1672 struct nlattr *a[ARRAY_SIZE(ovs_packet_policy)];
1673 struct nlmsghdr *nlmsg;
1674 struct genlmsghdr *genl;
1678 ofpbuf_use_const(&b, ofpbuf_data(buf), ofpbuf_size(buf));
1680 nlmsg = ofpbuf_try_pull(&b, sizeof *nlmsg);
1681 genl = ofpbuf_try_pull(&b, sizeof *genl);
1682 ovs_header = ofpbuf_try_pull(&b, sizeof *ovs_header);
1683 if (!nlmsg || !genl || !ovs_header
1684 || nlmsg->nlmsg_type != ovs_packet_family
1685 || !nl_policy_parse(&b, 0, ovs_packet_policy, a,
1686 ARRAY_SIZE(ovs_packet_policy))) {
1690 type = (genl->cmd == OVS_PACKET_CMD_MISS ? DPIF_UC_MISS
1691 : genl->cmd == OVS_PACKET_CMD_ACTION ? DPIF_UC_ACTION
1697 /* (Re)set ALL fields of '*upcall' on successful return. */
1698 upcall->type = type;
1699 upcall->key = CONST_CAST(struct nlattr *,
1700 nl_attr_get(a[OVS_PACKET_ATTR_KEY]));
1701 upcall->key_len = nl_attr_get_size(a[OVS_PACKET_ATTR_KEY]);
1702 upcall->userdata = a[OVS_PACKET_ATTR_USERDATA];
1704 /* Allow overwriting the netlink attribute header without reallocating. */
1705 ofpbuf_use_stub(&upcall->packet,
1706 CONST_CAST(struct nlattr *,
1707 nl_attr_get(a[OVS_PACKET_ATTR_PACKET])) - 1,
1708 nl_attr_get_size(a[OVS_PACKET_ATTR_PACKET]) +
1709 sizeof(struct nlattr));
1710 ofpbuf_set_data(&upcall->packet,
1711 (char *)ofpbuf_data(&upcall->packet) + sizeof(struct nlattr));
1712 ofpbuf_set_size(&upcall->packet, nl_attr_get_size(a[OVS_PACKET_ATTR_PACKET]));
1714 *dp_ifindex = ovs_header->dp_ifindex;
1720 dpif_linux_recv__(struct dpif_linux *dpif, uint32_t handler_id,
1721 struct dpif_upcall *upcall, struct ofpbuf *buf)
1722 OVS_REQ_RDLOCK(dpif->upcall_lock)
1724 struct dpif_handler *handler;
1727 if (!dpif->handlers || handler_id >= dpif->n_handlers) {
1731 handler = &dpif->handlers[handler_id];
1732 if (handler->event_offset >= handler->n_events) {
1735 handler->event_offset = handler->n_events = 0;
1738 retval = epoll_wait(handler->epoll_fd, handler->epoll_events,
1739 dpif->uc_array_size, 0);
1740 } while (retval < 0 && errno == EINTR);
1742 static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 1);
1743 VLOG_WARN_RL(&rl, "epoll_wait failed (%s)", ovs_strerror(errno));
1744 } else if (retval > 0) {
1745 handler->n_events = retval;
1749 while (handler->event_offset < handler->n_events) {
1750 int idx = handler->epoll_events[handler->event_offset].data.u32;
1751 struct dpif_channel *ch = &dpif->handlers[handler_id].channels[idx];
1753 handler->event_offset++;
1759 if (++read_tries > 50) {
1763 error = nl_sock_recv(ch->sock, buf, false);
1764 if (error == ENOBUFS) {
1765 /* ENOBUFS typically means that we've received so many
1766 * packets that the buffer overflowed. Try again
1767 * immediately because there's almost certainly a packet
1768 * waiting for us. */
1769 report_loss(dpif, ch, idx, handler_id);
1773 ch->last_poll = time_msec();
1775 if (error == EAGAIN) {
1781 error = parse_odp_packet(buf, upcall, &dp_ifindex);
1782 if (!error && dp_ifindex == dpif->dp_ifindex) {
1794 dpif_linux_recv(struct dpif *dpif_, uint32_t handler_id,
1795 struct dpif_upcall *upcall, struct ofpbuf *buf)
1797 struct dpif_linux *dpif = dpif_linux_cast(dpif_);
1800 fat_rwlock_rdlock(&dpif->upcall_lock);
1801 error = dpif_linux_recv__(dpif, handler_id, upcall, buf);
1802 fat_rwlock_unlock(&dpif->upcall_lock);
1808 dpif_linux_recv_wait__(struct dpif_linux *dpif, uint32_t handler_id)
1809 OVS_REQ_RDLOCK(dpif->upcall_lock)
1811 if (dpif->handlers && handler_id < dpif->n_handlers) {
1812 struct dpif_handler *handler = &dpif->handlers[handler_id];
1814 poll_fd_wait(handler->epoll_fd, POLLIN);
1819 dpif_linux_recv_wait(struct dpif *dpif_, uint32_t handler_id)
1821 struct dpif_linux *dpif = dpif_linux_cast(dpif_);
1823 fat_rwlock_rdlock(&dpif->upcall_lock);
1824 dpif_linux_recv_wait__(dpif, handler_id);
1825 fat_rwlock_unlock(&dpif->upcall_lock);
1829 dpif_linux_recv_purge__(struct dpif_linux *dpif)
1830 OVS_REQ_WRLOCK(dpif->upcall_lock)
1832 if (dpif->handlers) {
1835 for (i = 0; i < dpif->uc_array_size; i++ ) {
1836 if (!dpif->handlers[0].channels[i].sock) {
1840 for (j = 0; j < dpif->n_handlers; j++) {
1841 nl_sock_drain(dpif->handlers[j].channels[i].sock);
1848 dpif_linux_recv_purge(struct dpif *dpif_)
1850 struct dpif_linux *dpif = dpif_linux_cast(dpif_);
1852 fat_rwlock_wrlock(&dpif->upcall_lock);
1853 dpif_linux_recv_purge__(dpif);
1854 fat_rwlock_unlock(&dpif->upcall_lock);
1857 const struct dpif_class dpif_linux_class = {
1859 dpif_linux_enumerate,
1866 dpif_linux_get_stats,
1867 dpif_linux_port_add,
1868 dpif_linux_port_del,
1869 dpif_linux_port_query_by_number,
1870 dpif_linux_port_query_by_name,
1871 dpif_linux_port_get_pid,
1872 dpif_linux_port_dump_start,
1873 dpif_linux_port_dump_next,
1874 dpif_linux_port_dump_done,
1875 dpif_linux_port_poll,
1876 dpif_linux_port_poll_wait,
1877 dpif_linux_flow_get,
1878 dpif_linux_flow_put,
1879 dpif_linux_flow_del,
1880 dpif_linux_flow_flush,
1881 dpif_linux_flow_dump_state_init,
1882 dpif_linux_flow_dump_start,
1883 dpif_linux_flow_dump_next,
1884 dpif_linux_flow_dump_next_may_destroy_keys,
1885 dpif_linux_flow_dump_done,
1886 dpif_linux_flow_dump_state_uninit,
1889 dpif_linux_recv_set,
1890 dpif_linux_handlers_set,
1891 dpif_linux_queue_to_priority,
1893 dpif_linux_recv_wait,
1894 dpif_linux_recv_purge,
1898 dpif_linux_init(void)
1900 static struct ovsthread_once once = OVSTHREAD_ONCE_INITIALIZER;
1903 if (ovsthread_once_start(&once)) {
1904 error = nl_lookup_genl_family(OVS_DATAPATH_FAMILY,
1905 &ovs_datapath_family);
1907 VLOG_ERR("Generic Netlink family '%s' does not exist. "
1908 "The Open vSwitch kernel module is probably not loaded.",
1909 OVS_DATAPATH_FAMILY);
1912 error = nl_lookup_genl_family(OVS_VPORT_FAMILY, &ovs_vport_family);
1915 error = nl_lookup_genl_family(OVS_FLOW_FAMILY, &ovs_flow_family);
1918 error = nl_lookup_genl_family(OVS_PACKET_FAMILY,
1919 &ovs_packet_family);
1922 error = nl_lookup_genl_mcgroup(OVS_VPORT_FAMILY, OVS_VPORT_MCGROUP,
1923 &ovs_vport_mcgroup);
1926 ovsthread_once_done(&once);
1933 dpif_linux_is_internal_device(const char *name)
1935 struct dpif_linux_vport reply;
1939 error = dpif_linux_vport_get(name, &reply, &buf);
1942 } else if (error != ENODEV && error != ENOENT) {
1943 VLOG_WARN_RL(&error_rl, "%s: vport query failed (%s)",
1944 name, ovs_strerror(error));
1947 return reply.type == OVS_VPORT_TYPE_INTERNAL;
1950 /* Parses the contents of 'buf', which contains a "struct ovs_header" followed
1951 * by Netlink attributes, into 'vport'. Returns 0 if successful, otherwise a
1952 * positive errno value.
1954 * 'vport' will contain pointers into 'buf', so the caller should not free
1955 * 'buf' while 'vport' is still in use. */
1957 dpif_linux_vport_from_ofpbuf(struct dpif_linux_vport *vport,
1958 const struct ofpbuf *buf)
1960 static const struct nl_policy ovs_vport_policy[] = {
1961 [OVS_VPORT_ATTR_PORT_NO] = { .type = NL_A_U32 },
1962 [OVS_VPORT_ATTR_TYPE] = { .type = NL_A_U32 },
1963 [OVS_VPORT_ATTR_NAME] = { .type = NL_A_STRING, .max_len = IFNAMSIZ },
1964 [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NL_A_UNSPEC },
1965 [OVS_VPORT_ATTR_STATS] = { NL_POLICY_FOR(struct ovs_vport_stats),
1967 [OVS_VPORT_ATTR_OPTIONS] = { .type = NL_A_NESTED, .optional = true },
1970 struct nlattr *a[ARRAY_SIZE(ovs_vport_policy)];
1971 struct ovs_header *ovs_header;
1972 struct nlmsghdr *nlmsg;
1973 struct genlmsghdr *genl;
1976 dpif_linux_vport_init(vport);
1978 ofpbuf_use_const(&b, ofpbuf_data(buf), ofpbuf_size(buf));
1979 nlmsg = ofpbuf_try_pull(&b, sizeof *nlmsg);
1980 genl = ofpbuf_try_pull(&b, sizeof *genl);
1981 ovs_header = ofpbuf_try_pull(&b, sizeof *ovs_header);
1982 if (!nlmsg || !genl || !ovs_header
1983 || nlmsg->nlmsg_type != ovs_vport_family
1984 || !nl_policy_parse(&b, 0, ovs_vport_policy, a,
1985 ARRAY_SIZE(ovs_vport_policy))) {
1989 vport->cmd = genl->cmd;
1990 vport->dp_ifindex = ovs_header->dp_ifindex;
1991 vport->port_no = nl_attr_get_odp_port(a[OVS_VPORT_ATTR_PORT_NO]);
1992 vport->type = nl_attr_get_u32(a[OVS_VPORT_ATTR_TYPE]);
1993 vport->name = nl_attr_get_string(a[OVS_VPORT_ATTR_NAME]);
1994 if (a[OVS_VPORT_ATTR_UPCALL_PID]) {
1995 vport->n_upcall_pids = nl_attr_get_size(a[OVS_VPORT_ATTR_UPCALL_PID])
1996 / (sizeof *vport->upcall_pids);
1997 vport->upcall_pids = nl_attr_get(a[OVS_VPORT_ATTR_UPCALL_PID]);
2000 if (a[OVS_VPORT_ATTR_STATS]) {
2001 vport->stats = nl_attr_get(a[OVS_VPORT_ATTR_STATS]);
2003 if (a[OVS_VPORT_ATTR_OPTIONS]) {
2004 vport->options = nl_attr_get(a[OVS_VPORT_ATTR_OPTIONS]);
2005 vport->options_len = nl_attr_get_size(a[OVS_VPORT_ATTR_OPTIONS]);
2010 /* Appends to 'buf' (which must initially be empty) a "struct ovs_header"
2011 * followed by Netlink attributes corresponding to 'vport'. */
2013 dpif_linux_vport_to_ofpbuf(const struct dpif_linux_vport *vport,
2016 struct ovs_header *ovs_header;
2018 nl_msg_put_genlmsghdr(buf, 0, ovs_vport_family, NLM_F_REQUEST | NLM_F_ECHO,
2019 vport->cmd, OVS_VPORT_VERSION);
2021 ovs_header = ofpbuf_put_uninit(buf, sizeof *ovs_header);
2022 ovs_header->dp_ifindex = vport->dp_ifindex;
2024 if (vport->port_no != ODPP_NONE) {
2025 nl_msg_put_odp_port(buf, OVS_VPORT_ATTR_PORT_NO, vport->port_no);
2028 if (vport->type != OVS_VPORT_TYPE_UNSPEC) {
2029 nl_msg_put_u32(buf, OVS_VPORT_ATTR_TYPE, vport->type);
2033 nl_msg_put_string(buf, OVS_VPORT_ATTR_NAME, vport->name);
2036 if (vport->upcall_pids) {
2037 nl_msg_put_unspec(buf, OVS_VPORT_ATTR_UPCALL_PID,
2039 vport->n_upcall_pids * sizeof *vport->upcall_pids);
2043 nl_msg_put_unspec(buf, OVS_VPORT_ATTR_STATS,
2044 vport->stats, sizeof *vport->stats);
2047 if (vport->options) {
2048 nl_msg_put_nested(buf, OVS_VPORT_ATTR_OPTIONS,
2049 vport->options, vport->options_len);
2053 /* Clears 'vport' to "empty" values. */
2055 dpif_linux_vport_init(struct dpif_linux_vport *vport)
2057 memset(vport, 0, sizeof *vport);
2058 vport->port_no = ODPP_NONE;
2061 /* Executes 'request' in the kernel datapath. If the command fails, returns a
2062 * positive errno value. Otherwise, if 'reply' and 'bufp' are null, returns 0
2063 * without doing anything else. If 'reply' and 'bufp' are nonnull, then the
2064 * result of the command is expected to be an ovs_vport also, which is decoded
2065 * and stored in '*reply' and '*bufp'. The caller must free '*bufp' when the
2066 * reply is no longer needed ('reply' will contain pointers into '*bufp'). */
2068 dpif_linux_vport_transact(const struct dpif_linux_vport *request,
2069 struct dpif_linux_vport *reply,
2070 struct ofpbuf **bufp)
2072 struct ofpbuf *request_buf;
2075 ovs_assert((reply != NULL) == (bufp != NULL));
2077 error = dpif_linux_init();
2081 dpif_linux_vport_init(reply);
2086 request_buf = ofpbuf_new(1024);
2087 dpif_linux_vport_to_ofpbuf(request, request_buf);
2088 error = nl_transact(NETLINK_GENERIC, request_buf, bufp);
2089 ofpbuf_delete(request_buf);
2093 error = dpif_linux_vport_from_ofpbuf(reply, *bufp);
2096 dpif_linux_vport_init(reply);
2097 ofpbuf_delete(*bufp);
2104 /* Obtains information about the kernel vport named 'name' and stores it into
2105 * '*reply' and '*bufp'. The caller must free '*bufp' when the reply is no
2106 * longer needed ('reply' will contain pointers into '*bufp'). */
2108 dpif_linux_vport_get(const char *name, struct dpif_linux_vport *reply,
2109 struct ofpbuf **bufp)
2111 struct dpif_linux_vport request;
2113 dpif_linux_vport_init(&request);
2114 request.cmd = OVS_VPORT_CMD_GET;
2115 request.name = name;
2117 return dpif_linux_vport_transact(&request, reply, bufp);
2120 /* Parses the contents of 'buf', which contains a "struct ovs_header" followed
2121 * by Netlink attributes, into 'dp'. Returns 0 if successful, otherwise a
2122 * positive errno value.
2124 * 'dp' will contain pointers into 'buf', so the caller should not free 'buf'
2125 * while 'dp' is still in use. */
2127 dpif_linux_dp_from_ofpbuf(struct dpif_linux_dp *dp, const struct ofpbuf *buf)
2129 static const struct nl_policy ovs_datapath_policy[] = {
2130 [OVS_DP_ATTR_NAME] = { .type = NL_A_STRING, .max_len = IFNAMSIZ },
2131 [OVS_DP_ATTR_STATS] = { NL_POLICY_FOR(struct ovs_dp_stats),
2133 [OVS_DP_ATTR_MEGAFLOW_STATS] = {
2134 NL_POLICY_FOR(struct ovs_dp_megaflow_stats),
2138 struct nlattr *a[ARRAY_SIZE(ovs_datapath_policy)];
2139 struct ovs_header *ovs_header;
2140 struct nlmsghdr *nlmsg;
2141 struct genlmsghdr *genl;
2144 dpif_linux_dp_init(dp);
2146 ofpbuf_use_const(&b, ofpbuf_data(buf), ofpbuf_size(buf));
2147 nlmsg = ofpbuf_try_pull(&b, sizeof *nlmsg);
2148 genl = ofpbuf_try_pull(&b, sizeof *genl);
2149 ovs_header = ofpbuf_try_pull(&b, sizeof *ovs_header);
2150 if (!nlmsg || !genl || !ovs_header
2151 || nlmsg->nlmsg_type != ovs_datapath_family
2152 || !nl_policy_parse(&b, 0, ovs_datapath_policy, a,
2153 ARRAY_SIZE(ovs_datapath_policy))) {
2157 dp->cmd = genl->cmd;
2158 dp->dp_ifindex = ovs_header->dp_ifindex;
2159 dp->name = nl_attr_get_string(a[OVS_DP_ATTR_NAME]);
2160 if (a[OVS_DP_ATTR_STATS]) {
2161 /* Can't use structure assignment because Netlink doesn't ensure
2162 * sufficient alignment for 64-bit members. */
2163 memcpy(&dp->stats, nl_attr_get(a[OVS_DP_ATTR_STATS]),
2167 if (a[OVS_DP_ATTR_MEGAFLOW_STATS]) {
2168 /* Can't use structure assignment because Netlink doesn't ensure
2169 * sufficient alignment for 64-bit members. */
2170 memcpy(&dp->megaflow_stats, nl_attr_get(a[OVS_DP_ATTR_MEGAFLOW_STATS]),
2171 sizeof dp->megaflow_stats);
2177 /* Appends to 'buf' the Generic Netlink message described by 'dp'. */
2179 dpif_linux_dp_to_ofpbuf(const struct dpif_linux_dp *dp, struct ofpbuf *buf)
2181 struct ovs_header *ovs_header;
2183 nl_msg_put_genlmsghdr(buf, 0, ovs_datapath_family,
2184 NLM_F_REQUEST | NLM_F_ECHO, dp->cmd,
2185 OVS_DATAPATH_VERSION);
2187 ovs_header = ofpbuf_put_uninit(buf, sizeof *ovs_header);
2188 ovs_header->dp_ifindex = dp->dp_ifindex;
2191 nl_msg_put_string(buf, OVS_DP_ATTR_NAME, dp->name);
2194 if (dp->upcall_pid) {
2195 nl_msg_put_u32(buf, OVS_DP_ATTR_UPCALL_PID, *dp->upcall_pid);
2198 if (dp->user_features) {
2199 nl_msg_put_u32(buf, OVS_DP_ATTR_USER_FEATURES, dp->user_features);
2202 /* Skip OVS_DP_ATTR_STATS since we never have a reason to serialize it. */
2205 /* Clears 'dp' to "empty" values. */
2207 dpif_linux_dp_init(struct dpif_linux_dp *dp)
2209 memset(dp, 0, sizeof *dp);
2210 dp->megaflow_stats.n_masks = UINT32_MAX;
2211 dp->megaflow_stats.n_mask_hit = UINT64_MAX;
2215 dpif_linux_dp_dump_start(struct nl_dump *dump)
2217 struct dpif_linux_dp request;
2220 dpif_linux_dp_init(&request);
2221 request.cmd = OVS_DP_CMD_GET;
2223 buf = ofpbuf_new(1024);
2224 dpif_linux_dp_to_ofpbuf(&request, buf);
2225 nl_dump_start(dump, NETLINK_GENERIC, buf);
2229 /* Executes 'request' in the kernel datapath. If the command fails, returns a
2230 * positive errno value. Otherwise, if 'reply' and 'bufp' are null, returns 0
2231 * without doing anything else. If 'reply' and 'bufp' are nonnull, then the
2232 * result of the command is expected to be of the same form, which is decoded
2233 * and stored in '*reply' and '*bufp'. The caller must free '*bufp' when the
2234 * reply is no longer needed ('reply' will contain pointers into '*bufp'). */
2236 dpif_linux_dp_transact(const struct dpif_linux_dp *request,
2237 struct dpif_linux_dp *reply, struct ofpbuf **bufp)
2239 struct ofpbuf *request_buf;
2242 ovs_assert((reply != NULL) == (bufp != NULL));
2244 request_buf = ofpbuf_new(1024);
2245 dpif_linux_dp_to_ofpbuf(request, request_buf);
2246 error = nl_transact(NETLINK_GENERIC, request_buf, bufp);
2247 ofpbuf_delete(request_buf);
2250 dpif_linux_dp_init(reply);
2252 error = dpif_linux_dp_from_ofpbuf(reply, *bufp);
2255 ofpbuf_delete(*bufp);
2262 /* Obtains information about 'dpif_' and stores it into '*reply' and '*bufp'.
2263 * The caller must free '*bufp' when the reply is no longer needed ('reply'
2264 * will contain pointers into '*bufp'). */
2266 dpif_linux_dp_get(const struct dpif *dpif_, struct dpif_linux_dp *reply,
2267 struct ofpbuf **bufp)
2269 struct dpif_linux *dpif = dpif_linux_cast(dpif_);
2270 struct dpif_linux_dp request;
2272 dpif_linux_dp_init(&request);
2273 request.cmd = OVS_DP_CMD_GET;
2274 request.dp_ifindex = dpif->dp_ifindex;
2276 return dpif_linux_dp_transact(&request, reply, bufp);
2279 /* Parses the contents of 'buf', which contains a "struct ovs_header" followed
2280 * by Netlink attributes, into 'flow'. Returns 0 if successful, otherwise a
2281 * positive errno value.
2283 * 'flow' will contain pointers into 'buf', so the caller should not free 'buf'
2284 * while 'flow' is still in use. */
2286 dpif_linux_flow_from_ofpbuf(struct dpif_linux_flow *flow,
2287 const struct ofpbuf *buf)
2289 static const struct nl_policy ovs_flow_policy[] = {
2290 [OVS_FLOW_ATTR_KEY] = { .type = NL_A_NESTED },
2291 [OVS_FLOW_ATTR_MASK] = { .type = NL_A_NESTED, .optional = true },
2292 [OVS_FLOW_ATTR_ACTIONS] = { .type = NL_A_NESTED, .optional = true },
2293 [OVS_FLOW_ATTR_STATS] = { NL_POLICY_FOR(struct ovs_flow_stats),
2295 [OVS_FLOW_ATTR_TCP_FLAGS] = { .type = NL_A_U8, .optional = true },
2296 [OVS_FLOW_ATTR_USED] = { .type = NL_A_U64, .optional = true },
2297 /* The kernel never uses OVS_FLOW_ATTR_CLEAR. */
2300 struct nlattr *a[ARRAY_SIZE(ovs_flow_policy)];
2301 struct ovs_header *ovs_header;
2302 struct nlmsghdr *nlmsg;
2303 struct genlmsghdr *genl;
2306 dpif_linux_flow_init(flow);
2308 ofpbuf_use_const(&b, ofpbuf_data(buf), ofpbuf_size(buf));
2309 nlmsg = ofpbuf_try_pull(&b, sizeof *nlmsg);
2310 genl = ofpbuf_try_pull(&b, sizeof *genl);
2311 ovs_header = ofpbuf_try_pull(&b, sizeof *ovs_header);
2312 if (!nlmsg || !genl || !ovs_header
2313 || nlmsg->nlmsg_type != ovs_flow_family
2314 || !nl_policy_parse(&b, 0, ovs_flow_policy, a,
2315 ARRAY_SIZE(ovs_flow_policy))) {
2319 flow->nlmsg_flags = nlmsg->nlmsg_flags;
2320 flow->dp_ifindex = ovs_header->dp_ifindex;
2321 flow->key = nl_attr_get(a[OVS_FLOW_ATTR_KEY]);
2322 flow->key_len = nl_attr_get_size(a[OVS_FLOW_ATTR_KEY]);
2324 if (a[OVS_FLOW_ATTR_MASK]) {
2325 flow->mask = nl_attr_get(a[OVS_FLOW_ATTR_MASK]);
2326 flow->mask_len = nl_attr_get_size(a[OVS_FLOW_ATTR_MASK]);
2328 if (a[OVS_FLOW_ATTR_ACTIONS]) {
2329 flow->actions = nl_attr_get(a[OVS_FLOW_ATTR_ACTIONS]);
2330 flow->actions_len = nl_attr_get_size(a[OVS_FLOW_ATTR_ACTIONS]);
2332 if (a[OVS_FLOW_ATTR_STATS]) {
2333 flow->stats = nl_attr_get(a[OVS_FLOW_ATTR_STATS]);
2335 if (a[OVS_FLOW_ATTR_TCP_FLAGS]) {
2336 flow->tcp_flags = nl_attr_get(a[OVS_FLOW_ATTR_TCP_FLAGS]);
2338 if (a[OVS_FLOW_ATTR_USED]) {
2339 flow->used = nl_attr_get(a[OVS_FLOW_ATTR_USED]);
2344 /* Appends to 'buf' (which must initially be empty) a "struct ovs_header"
2345 * followed by Netlink attributes corresponding to 'flow'. */
2347 dpif_linux_flow_to_ofpbuf(const struct dpif_linux_flow *flow,
2350 struct ovs_header *ovs_header;
2352 nl_msg_put_genlmsghdr(buf, 0, ovs_flow_family,
2353 NLM_F_REQUEST | flow->nlmsg_flags,
2354 flow->cmd, OVS_FLOW_VERSION);
2356 ovs_header = ofpbuf_put_uninit(buf, sizeof *ovs_header);
2357 ovs_header->dp_ifindex = flow->dp_ifindex;
2359 if (flow->key_len) {
2360 nl_msg_put_unspec(buf, OVS_FLOW_ATTR_KEY, flow->key, flow->key_len);
2363 if (flow->mask_len) {
2364 nl_msg_put_unspec(buf, OVS_FLOW_ATTR_MASK, flow->mask, flow->mask_len);
2367 if (flow->actions || flow->actions_len) {
2368 nl_msg_put_unspec(buf, OVS_FLOW_ATTR_ACTIONS,
2369 flow->actions, flow->actions_len);
2372 /* We never need to send these to the kernel. */
2373 ovs_assert(!flow->stats);
2374 ovs_assert(!flow->tcp_flags);
2375 ovs_assert(!flow->used);
2378 nl_msg_put_flag(buf, OVS_FLOW_ATTR_CLEAR);
2382 /* Clears 'flow' to "empty" values. */
2384 dpif_linux_flow_init(struct dpif_linux_flow *flow)
2386 memset(flow, 0, sizeof *flow);
2389 /* Executes 'request' in the kernel datapath. If the command fails, returns a
2390 * positive errno value. Otherwise, if 'reply' and 'bufp' are null, returns 0
2391 * without doing anything else. If 'reply' and 'bufp' are nonnull, then the
2392 * result of the command is expected to be a flow also, which is decoded and
2393 * stored in '*reply' and '*bufp'. The caller must free '*bufp' when the reply
2394 * is no longer needed ('reply' will contain pointers into '*bufp'). */
2396 dpif_linux_flow_transact(struct dpif_linux_flow *request,
2397 struct dpif_linux_flow *reply, struct ofpbuf **bufp)
2399 struct ofpbuf *request_buf;
2402 ovs_assert((reply != NULL) == (bufp != NULL));
2405 request->nlmsg_flags |= NLM_F_ECHO;
2408 request_buf = ofpbuf_new(1024);
2409 dpif_linux_flow_to_ofpbuf(request, request_buf);
2410 error = nl_transact(NETLINK_GENERIC, request_buf, bufp);
2411 ofpbuf_delete(request_buf);
2415 error = dpif_linux_flow_from_ofpbuf(reply, *bufp);
2418 dpif_linux_flow_init(reply);
2419 ofpbuf_delete(*bufp);
2427 dpif_linux_flow_get_stats(const struct dpif_linux_flow *flow,
2428 struct dpif_flow_stats *stats)
2431 stats->n_packets = get_unaligned_u64(&flow->stats->n_packets);
2432 stats->n_bytes = get_unaligned_u64(&flow->stats->n_bytes);
2434 stats->n_packets = 0;
2437 stats->used = flow->used ? get_32aligned_u64(flow->used) : 0;
2438 stats->tcp_flags = flow->tcp_flags ? *flow->tcp_flags : 0;
2441 /* Logs information about a packet that was recently lost in 'ch' (in
2444 report_loss(struct dpif_linux *dpif, struct dpif_channel *ch, uint32_t ch_idx,
2445 uint32_t handler_id)
2447 static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(5, 5);
2450 if (VLOG_DROP_WARN(&rl)) {
2455 if (ch->last_poll != LLONG_MIN) {
2456 ds_put_format(&s, " (last polled %lld ms ago)",
2457 time_msec() - ch->last_poll);
2460 VLOG_WARN("%s: lost packet on port channel %u of handler %u",
2461 dpif_name(&dpif->dpif), ch_idx, handler_id);