2 * Copyright (c) 2007, 2008, 2009, 2010 Nicira Networks.
3 * Distributed under the terms of the GNU GPL version 2.
5 * Significant portions of this file may be copied from parts of the Linux
6 * kernel, by Linus Torvalds and others.
9 /* Functions for managing the dp interface/device. */
11 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
13 #include <linux/init.h>
14 #include <linux/module.h>
16 #include <linux/if_arp.h>
17 #include <linux/if_vlan.h>
20 #include <linux/delay.h>
21 #include <linux/time.h>
22 #include <linux/etherdevice.h>
23 #include <linux/kernel.h>
24 #include <linux/kthread.h>
25 #include <linux/mutex.h>
26 #include <linux/percpu.h>
27 #include <linux/rcupdate.h>
28 #include <linux/tcp.h>
29 #include <linux/udp.h>
30 #include <linux/version.h>
31 #include <linux/ethtool.h>
32 #include <linux/wait.h>
33 #include <asm/system.h>
34 #include <asm/div64.h>
36 #include <linux/highmem.h>
37 #include <linux/netfilter_bridge.h>
38 #include <linux/netfilter_ipv4.h>
39 #include <linux/inetdevice.h>
40 #include <linux/list.h>
41 #include <linux/rculist.h>
42 #include <linux/dmi.h>
43 #include <net/inet_ecn.h>
44 #include <linux/compat.h>
46 #include "openvswitch/datapath-protocol.h"
51 #include "loop_counter.h"
52 #include "odp-compat.h"
54 #include "vport-internal_dev.h"
58 int (*dp_ioctl_hook)(struct net_device *dev, struct ifreq *rq, int cmd);
59 EXPORT_SYMBOL(dp_ioctl_hook);
61 /* Datapaths. Protected on the read side by rcu_read_lock, on the write side
64 * dp_mutex nests inside the RTNL lock: if you need both you must take the RTNL
67 * It is safe to access the datapath and vport structures with just
70 static struct datapath __rcu *dps[ODP_MAX];
71 static DEFINE_MUTEX(dp_mutex);
73 static int new_vport(struct datapath *, struct odp_port *, int port_no);
75 /* Must be called with rcu_read_lock or dp_mutex. */
76 struct datapath *get_dp(int dp_idx)
78 if (dp_idx < 0 || dp_idx >= ODP_MAX)
80 return rcu_dereference_check(dps[dp_idx], rcu_read_lock_held() ||
81 lockdep_is_held(&dp_mutex));
83 EXPORT_SYMBOL_GPL(get_dp);
85 static struct datapath *get_dp_locked(int dp_idx)
89 mutex_lock(&dp_mutex);
92 mutex_lock(&dp->mutex);
93 mutex_unlock(&dp_mutex);
97 static struct tbl *get_table_protected(const struct datapath *dp)
99 return rcu_dereference_protected(dp->table,
100 lockdep_is_held(&dp->mutex));
103 static struct vport *get_vport_protected(const struct datapath *dp,
106 return rcu_dereference_protected(dp->ports[port_no],
107 lockdep_is_held(&dp->mutex));
110 /* Must be called with rcu_read_lock or RTNL lock. */
111 const char *dp_name(const struct datapath *dp)
113 return vport_get_name(rcu_dereference_rtnl(dp->ports[ODPP_LOCAL]));
116 static inline size_t br_nlmsg_size(void)
118 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
119 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
120 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
121 + nla_total_size(4) /* IFLA_MASTER */
122 + nla_total_size(4) /* IFLA_MTU */
123 + nla_total_size(4) /* IFLA_LINK */
124 + nla_total_size(1); /* IFLA_OPERSTATE */
127 static int dp_fill_ifinfo(struct sk_buff *skb,
128 const struct vport *port,
129 int event, unsigned int flags)
131 const struct datapath *dp = port->dp;
132 int ifindex = vport_get_ifindex(port);
133 int iflink = vport_get_iflink(port);
134 struct ifinfomsg *hdr;
135 struct nlmsghdr *nlh;
143 nlh = nlmsg_put(skb, 0, 0, event, sizeof(*hdr), flags);
147 hdr = nlmsg_data(nlh);
148 hdr->ifi_family = AF_BRIDGE;
150 hdr->ifi_type = ARPHRD_ETHER;
151 hdr->ifi_index = ifindex;
152 hdr->ifi_flags = vport_get_flags(port);
155 NLA_PUT_STRING(skb, IFLA_IFNAME, vport_get_name(port));
156 NLA_PUT_U32(skb, IFLA_MASTER,
157 vport_get_ifindex(get_vport_protected(dp, ODPP_LOCAL)));
158 NLA_PUT_U32(skb, IFLA_MTU, vport_get_mtu(port));
159 #ifdef IFLA_OPERSTATE
160 NLA_PUT_U8(skb, IFLA_OPERSTATE,
161 vport_is_running(port)
162 ? vport_get_operstate(port)
166 NLA_PUT(skb, IFLA_ADDRESS, ETH_ALEN, vport_get_addr(port));
168 if (ifindex != iflink)
169 NLA_PUT_U32(skb, IFLA_LINK,iflink);
171 return nlmsg_end(skb, nlh);
174 nlmsg_cancel(skb, nlh);
178 static void dp_ifinfo_notify(int event, struct vport *port)
183 skb = nlmsg_new(br_nlmsg_size(), GFP_KERNEL);
187 err = dp_fill_ifinfo(skb, port, event, 0);
189 /* -EMSGSIZE implies BUG in br_nlmsg_size() */
190 WARN_ON(err == -EMSGSIZE);
194 rtnl_notify(skb, &init_net, 0, RTNLGRP_LINK, NULL, GFP_KERNEL);
198 rtnl_set_sk_err(&init_net, RTNLGRP_LINK, err);
201 static void release_dp(struct kobject *kobj)
203 struct datapath *dp = container_of(kobj, struct datapath, ifobj);
207 static struct kobj_type dp_ktype = {
208 .release = release_dp
211 static int create_dp(int dp_idx, const char __user *devnamep)
213 struct odp_port internal_dev_port;
214 char devname[IFNAMSIZ];
220 int retval = strncpy_from_user(devname, devnamep, IFNAMSIZ);
224 } else if (retval >= IFNAMSIZ) {
229 snprintf(devname, sizeof devname, "of%d", dp_idx);
233 mutex_lock(&dp_mutex);
235 if (!try_module_get(THIS_MODULE))
238 /* Exit early if a datapath with that number already exists.
239 * (We don't use -EEXIST because that's ambiguous with 'devname'
240 * conflicting with an existing network device name.) */
246 dp = kzalloc(sizeof *dp, GFP_KERNEL);
249 INIT_LIST_HEAD(&dp->port_list);
250 mutex_init(&dp->mutex);
252 for (i = 0; i < DP_N_QUEUES; i++)
253 skb_queue_head_init(&dp->queues[i]);
254 init_waitqueue_head(&dp->waitqueue);
256 /* Initialize kobject for bridge. This will be added as
257 * /sys/class/net/<devname>/brif later, if sysfs is enabled. */
258 dp->ifobj.kset = NULL;
259 kobject_init(&dp->ifobj, &dp_ktype);
261 /* Allocate table. */
263 rcu_assign_pointer(dp->table, tbl_create(TBL_MIN_BUCKETS));
267 /* Set up our datapath device. */
268 BUILD_BUG_ON(sizeof(internal_dev_port.devname) != sizeof(devname));
269 strcpy(internal_dev_port.devname, devname);
270 strcpy(internal_dev_port.type, "internal");
271 err = new_vport(dp, &internal_dev_port, ODPP_LOCAL);
276 goto err_destroy_table;
280 dp->stats_percpu = alloc_percpu(struct dp_stats_percpu);
281 if (!dp->stats_percpu) {
283 goto err_destroy_local_port;
286 rcu_assign_pointer(dps[dp_idx], dp);
289 mutex_unlock(&dp_mutex);
294 err_destroy_local_port:
295 dp_detach_port(get_vport_protected(dp, ODPP_LOCAL));
297 tbl_destroy(get_table_protected(dp), NULL);
301 module_put(THIS_MODULE);
303 mutex_unlock(&dp_mutex);
309 static int destroy_dp(int dp_idx)
317 mutex_lock(&dp_mutex);
324 list_for_each_entry_safe (p, n, &dp->port_list, node)
325 if (p->port_no != ODPP_LOCAL)
330 rcu_assign_pointer(dps[dp->dp_idx], NULL);
332 dp_detach_port(get_vport_protected(dp, ODPP_LOCAL));
333 tbl_destroy(get_table_protected(dp), flow_free_tbl);
335 for (i = 0; i < DP_N_QUEUES; i++)
336 skb_queue_purge(&dp->queues[i]);
337 free_percpu(dp->stats_percpu);
339 kobject_put(&dp->ifobj);
340 module_put(THIS_MODULE);
343 mutex_unlock(&dp_mutex);
348 /* Called with RTNL lock and dp_mutex. */
349 static int new_vport(struct datapath *dp, struct odp_port *odp_port, int port_no)
351 struct vport_parms parms;
354 parms.name = odp_port->devname;
355 parms.type = odp_port->type;
356 parms.config = odp_port->config;
358 parms.port_no = port_no;
361 vport = vport_add(&parms);
365 return PTR_ERR(vport);
367 rcu_assign_pointer(dp->ports[port_no], vport);
368 list_add_rcu(&vport->node, &dp->port_list);
371 dp_ifinfo_notify(RTM_NEWLINK, vport);
376 static int attach_port(int dp_idx, struct odp_port __user *portp)
379 struct odp_port port;
384 if (copy_from_user(&port, portp, sizeof port))
386 port.devname[IFNAMSIZ - 1] = '\0';
387 port.type[VPORT_TYPE_SIZE - 1] = '\0';
390 dp = get_dp_locked(dp_idx);
393 goto out_unlock_rtnl;
395 for (port_no = 1; port_no < DP_MAX_PORTS; port_no++)
396 if (!dp->ports[port_no])
402 err = new_vport(dp, &port, port_no);
406 set_internal_devs_mtu(dp);
407 dp_sysfs_add_if(get_vport_protected(dp, port_no));
409 err = put_user(port_no, &portp->port);
412 mutex_unlock(&dp->mutex);
419 int dp_detach_port(struct vport *p)
425 if (p->port_no != ODPP_LOCAL)
427 dp_ifinfo_notify(RTM_DELLINK, p);
429 /* First drop references to device. */
431 list_del_rcu(&p->node);
432 rcu_assign_pointer(p->dp->ports[p->port_no], NULL);
434 /* Then destroy it. */
442 static int detach_port(int dp_idx, int port_no)
449 if (port_no < 0 || port_no >= DP_MAX_PORTS || port_no == ODPP_LOCAL)
453 dp = get_dp_locked(dp_idx);
456 goto out_unlock_rtnl;
458 p = get_vport_protected(dp, port_no);
463 err = dp_detach_port(p);
466 mutex_unlock(&dp->mutex);
473 /* Must be called with rcu_read_lock. */
474 void dp_process_received_packet(struct vport *p, struct sk_buff *skb)
476 struct datapath *dp = p->dp;
477 struct dp_stats_percpu *stats;
478 int stats_counter_off;
479 struct sw_flow_actions *acts;
480 struct loop_counter *loop;
483 OVS_CB(skb)->vport = p;
485 if (!OVS_CB(skb)->flow) {
486 struct odp_flow_key key;
487 struct tbl_node *flow_node;
490 /* Extract flow from 'skb' into 'key'. */
491 error = flow_extract(skb, p ? p->port_no : ODPP_NONE, &key, &is_frag);
492 if (unlikely(error)) {
497 if (is_frag && dp->drop_frags) {
499 stats_counter_off = offsetof(struct dp_stats_percpu, n_frags);
504 flow_node = tbl_lookup(rcu_dereference(dp->table), &key,
505 flow_hash(&key), flow_cmp);
506 if (unlikely(!flow_node)) {
507 dp_output_control(dp, skb, _ODPL_MISS_NR,
508 (__force u64)OVS_CB(skb)->tun_id);
509 stats_counter_off = offsetof(struct dp_stats_percpu, n_missed);
513 OVS_CB(skb)->flow = flow_cast(flow_node);
516 stats_counter_off = offsetof(struct dp_stats_percpu, n_hit);
517 flow_used(OVS_CB(skb)->flow, skb);
519 acts = rcu_dereference(OVS_CB(skb)->flow->sf_acts);
521 /* Check whether we've looped too much. */
522 loop = loop_get_counter();
523 if (unlikely(++loop->count > MAX_LOOPS))
524 loop->looping = true;
525 if (unlikely(loop->looping)) {
526 loop_suppress(dp, acts);
531 /* Execute actions. */
532 execute_actions(dp, skb, &OVS_CB(skb)->flow->key, acts->actions,
535 /* Check whether sub-actions looped too much. */
536 if (unlikely(loop->looping))
537 loop_suppress(dp, acts);
540 /* Decrement loop counter. */
542 loop->looping = false;
546 /* Update datapath statistics. */
548 stats = per_cpu_ptr(dp->stats_percpu, smp_processor_id());
550 write_seqcount_begin(&stats->seqlock);
551 (*(u64 *)((u8 *)stats + stats_counter_off))++;
552 write_seqcount_end(&stats->seqlock);
557 /* Append each packet in 'skb' list to 'queue'. There will be only one packet
558 * unless we broke up a GSO packet. */
559 static int queue_control_packets(struct sk_buff *skb, struct sk_buff_head *queue,
560 int queue_no, u64 arg)
562 struct sk_buff *nskb;
566 if (OVS_CB(skb)->vport)
567 port_no = OVS_CB(skb)->vport->port_no;
569 port_no = ODPP_LOCAL;
572 struct odp_msg *header;
577 err = skb_cow(skb, sizeof *header);
581 header = (struct odp_msg*)__skb_push(skb, sizeof *header);
582 header->type = queue_no;
583 header->length = skb->len;
584 header->port = port_no;
586 skb_queue_tail(queue, skb);
594 while ((skb = nskb) != NULL) {
601 int dp_output_control(struct datapath *dp, struct sk_buff *skb, int queue_no,
604 struct dp_stats_percpu *stats;
605 struct sk_buff_head *queue;
608 WARN_ON_ONCE(skb_shared(skb));
609 BUG_ON(queue_no != _ODPL_MISS_NR && queue_no != _ODPL_ACTION_NR && queue_no != _ODPL_SFLOW_NR);
610 queue = &dp->queues[queue_no];
612 if (skb_queue_len(queue) >= DP_MAX_QUEUE_LEN)
615 forward_ip_summed(skb);
617 err = vswitch_skb_checksum_setup(skb);
621 /* Break apart GSO packets into their component pieces. Otherwise
622 * userspace may try to stuff a 64kB packet into a 1500-byte MTU. */
623 if (skb_is_gso(skb)) {
624 struct sk_buff *nskb = skb_gso_segment(skb, NETIF_F_SG | NETIF_F_HW_CSUM);
634 err = queue_control_packets(skb, queue, queue_no, arg);
635 wake_up_interruptible(&dp->waitqueue);
642 stats = per_cpu_ptr(dp->stats_percpu, smp_processor_id());
644 write_seqcount_begin(&stats->seqlock);
646 write_seqcount_end(&stats->seqlock);
653 static int flush_flows(struct datapath *dp)
655 struct tbl *old_table = get_table_protected(dp);
656 struct tbl *new_table;
658 new_table = tbl_create(TBL_MIN_BUCKETS);
662 rcu_assign_pointer(dp->table, new_table);
664 tbl_deferred_destroy(old_table, flow_free_tbl);
669 static int validate_actions(const struct nlattr *actions, u32 actions_len)
671 const struct nlattr *a;
674 nla_for_each_attr(a, actions, actions_len, rem) {
675 static const u32 action_lens[ODPAT_MAX + 1] = {
677 [ODPAT_CONTROLLER] = 8,
678 [ODPAT_SET_DL_TCI] = 2,
679 [ODPAT_STRIP_VLAN] = 0,
680 [ODPAT_SET_DL_SRC] = ETH_ALEN,
681 [ODPAT_SET_DL_DST] = ETH_ALEN,
682 [ODPAT_SET_NW_SRC] = 4,
683 [ODPAT_SET_NW_DST] = 4,
684 [ODPAT_SET_NW_TOS] = 1,
685 [ODPAT_SET_TP_SRC] = 2,
686 [ODPAT_SET_TP_DST] = 2,
687 [ODPAT_SET_TUNNEL] = 8,
688 [ODPAT_SET_PRIORITY] = 4,
689 [ODPAT_POP_PRIORITY] = 0,
690 [ODPAT_DROP_SPOOFED_ARP] = 0,
692 int type = nla_type(a);
694 if (type > ODPAT_MAX || nla_len(a) != action_lens[type])
701 case ODPAT_CONTROLLER:
702 case ODPAT_STRIP_VLAN:
703 case ODPAT_SET_DL_SRC:
704 case ODPAT_SET_DL_DST:
705 case ODPAT_SET_NW_SRC:
706 case ODPAT_SET_NW_DST:
707 case ODPAT_SET_TP_SRC:
708 case ODPAT_SET_TP_DST:
709 case ODPAT_SET_TUNNEL:
710 case ODPAT_SET_PRIORITY:
711 case ODPAT_POP_PRIORITY:
712 case ODPAT_DROP_SPOOFED_ARP:
713 /* No validation needed. */
717 if (nla_get_u32(a) >= DP_MAX_PORTS)
720 case ODPAT_SET_DL_TCI:
721 if (nla_get_be16(a) & htons(VLAN_CFI_MASK))
725 case ODPAT_SET_NW_TOS:
726 if (nla_get_u8(a) & INET_ECN_MASK)
741 static struct sw_flow_actions *get_actions(const struct odp_flow *flow)
743 struct sw_flow_actions *actions;
746 actions = flow_actions_alloc(flow->actions_len);
747 error = PTR_ERR(actions);
752 if (copy_from_user(actions->actions,
753 (struct nlattr __user __force *)flow->actions,
755 goto error_free_actions;
756 error = validate_actions(actions->actions, actions->actions_len);
758 goto error_free_actions;
765 return ERR_PTR(error);
768 static void get_stats(struct sw_flow *flow, struct odp_flow_stats *stats)
771 struct timespec offset_ts, used, now_mono;
773 ktime_get_ts(&now_mono);
774 jiffies_to_timespec(jiffies - flow->used, &offset_ts);
775 set_normalized_timespec(&used, now_mono.tv_sec - offset_ts.tv_sec,
776 now_mono.tv_nsec - offset_ts.tv_nsec);
778 stats->used_sec = used.tv_sec;
779 stats->used_nsec = used.tv_nsec;
782 stats->used_nsec = 0;
785 stats->n_packets = flow->packet_count;
786 stats->n_bytes = flow->byte_count;
788 stats->tcp_flags = flow->tcp_flags;
792 static void clear_stats(struct sw_flow *flow)
796 flow->packet_count = 0;
797 flow->byte_count = 0;
800 static int expand_table(struct datapath *dp)
802 struct tbl *old_table = get_table_protected(dp);
803 struct tbl *new_table;
805 new_table = tbl_expand(old_table);
806 if (IS_ERR(new_table))
807 return PTR_ERR(new_table);
809 rcu_assign_pointer(dp->table, new_table);
810 tbl_deferred_destroy(old_table, NULL);
815 static int do_put_flow(struct datapath *dp, struct odp_flow_put *uf,
816 struct odp_flow_stats *stats)
818 struct tbl_node *flow_node;
819 struct sw_flow *flow;
821 struct sw_flow_actions *acts = NULL;
825 hash = flow_hash(&uf->flow.key);
826 table = get_table_protected(dp);
827 flow_node = tbl_lookup(table, &uf->flow.key, hash, flow_cmp);
831 if (!(uf->flags & ODPPF_CREATE))
834 /* Expand table, if necessary, to make room. */
835 if (tbl_count(table) >= tbl_n_buckets(table)) {
836 error = expand_table(dp);
839 table = get_table_protected(dp);
845 error = PTR_ERR(flow);
848 flow->key = uf->flow.key;
851 /* Obtain actions. */
852 acts = get_actions(&uf->flow);
853 error = PTR_ERR(acts);
855 goto error_free_flow;
856 rcu_assign_pointer(flow->sf_acts, acts);
858 /* Put flow in bucket. */
859 error = tbl_insert(table, &flow->tbl_node, hash);
861 goto error_free_flow_acts;
863 memset(stats, 0, sizeof(struct odp_flow_stats));
865 /* We found a matching flow. */
866 struct sw_flow_actions *old_acts, *new_acts;
868 flow = flow_cast(flow_node);
870 /* Bail out if we're not allowed to modify an existing flow. */
872 if (!(uf->flags & ODPPF_MODIFY))
876 new_acts = get_actions(&uf->flow);
877 error = PTR_ERR(new_acts);
878 if (IS_ERR(new_acts))
881 old_acts = rcu_dereference_protected(flow->sf_acts,
882 lockdep_is_held(&dp->mutex));
883 if (old_acts->actions_len != new_acts->actions_len ||
884 memcmp(old_acts->actions, new_acts->actions,
885 old_acts->actions_len)) {
886 rcu_assign_pointer(flow->sf_acts, new_acts);
887 flow_deferred_free_acts(old_acts);
892 /* Fetch stats, then clear them if necessary. */
893 spin_lock_bh(&flow->lock);
894 get_stats(flow, stats);
895 if (uf->flags & ODPPF_ZERO_STATS)
897 spin_unlock_bh(&flow->lock);
902 error_free_flow_acts:
905 flow->sf_acts = NULL;
911 static int put_flow(struct datapath *dp, struct odp_flow_put __user *ufp)
913 struct odp_flow_stats stats;
914 struct odp_flow_put uf;
917 if (copy_from_user(&uf, ufp, sizeof(struct odp_flow_put)))
920 error = do_put_flow(dp, &uf, &stats);
924 if (copy_to_user(&ufp->flow.stats, &stats,
925 sizeof(struct odp_flow_stats)))
931 static int do_answer_query(struct datapath *dp, struct sw_flow *flow,
933 struct odp_flow_stats __user *ustats,
934 struct nlattr __user *actions,
935 u32 __user *actions_lenp)
937 struct sw_flow_actions *sf_acts;
938 struct odp_flow_stats stats;
941 spin_lock_bh(&flow->lock);
942 get_stats(flow, &stats);
943 if (query_flags & ODPFF_ZERO_TCP_FLAGS)
946 spin_unlock_bh(&flow->lock);
948 if (copy_to_user(ustats, &stats, sizeof(struct odp_flow_stats)) ||
949 get_user(actions_len, actions_lenp))
955 sf_acts = rcu_dereference_protected(flow->sf_acts,
956 lockdep_is_held(&dp->mutex));
957 if (put_user(sf_acts->actions_len, actions_lenp) ||
958 (actions && copy_to_user(actions, sf_acts->actions,
959 min(sf_acts->actions_len, actions_len))))
965 static int answer_query(struct datapath *dp, struct sw_flow *flow,
966 u32 query_flags, struct odp_flow __user *ufp)
968 struct nlattr __user *actions;
970 if (get_user(actions, (struct nlattr __user * __user *)&ufp->actions))
973 return do_answer_query(dp, flow, query_flags,
974 &ufp->stats, actions, &ufp->actions_len);
977 static struct sw_flow *do_del_flow(struct datapath *dp, struct odp_flow_key *key)
979 struct tbl *table = get_table_protected(dp);
980 struct tbl_node *flow_node;
983 flow_node = tbl_lookup(table, key, flow_hash(key), flow_cmp);
985 return ERR_PTR(-ENOENT);
987 error = tbl_remove(table, flow_node);
989 return ERR_PTR(error);
991 /* XXX Returned flow_node's statistics might lose a few packets, since
992 * other CPUs can be using this flow. We used to synchronize_rcu() to
993 * make sure that we get completely accurate stats, but that blows our
994 * performance, badly. */
995 return flow_cast(flow_node);
998 static int del_flow(struct datapath *dp, struct odp_flow __user *ufp)
1000 struct sw_flow *flow;
1004 if (copy_from_user(&uf, ufp, sizeof uf))
1007 flow = do_del_flow(dp, &uf.key);
1009 return PTR_ERR(flow);
1011 error = answer_query(dp, flow, 0, ufp);
1012 flow_deferred_free(flow);
1016 static int do_query_flows(struct datapath *dp, const struct odp_flowvec *flowvec)
1018 struct tbl *table = get_table_protected(dp);
1021 for (i = 0; i < flowvec->n_flows; i++) {
1022 struct odp_flow __user *ufp = (struct odp_flow __user __force *)&flowvec->flows[i];
1024 struct tbl_node *flow_node;
1027 if (copy_from_user(&uf, ufp, sizeof uf))
1030 flow_node = tbl_lookup(table, &uf.key, flow_hash(&uf.key), flow_cmp);
1032 error = put_user(ENOENT, &ufp->stats.error);
1034 error = answer_query(dp, flow_cast(flow_node), uf.flags, ufp);
1038 return flowvec->n_flows;
1041 struct list_flows_cbdata {
1042 struct datapath *dp;
1043 struct odp_flow __user *uflows;
1048 static int list_flow(struct tbl_node *node, void *cbdata_)
1050 struct sw_flow *flow = flow_cast(node);
1051 struct list_flows_cbdata *cbdata = cbdata_;
1052 struct odp_flow __user *ufp = &cbdata->uflows[cbdata->listed_flows++];
1055 if (copy_to_user(&ufp->key, &flow->key, sizeof flow->key))
1057 error = answer_query(cbdata->dp, flow, 0, ufp);
1061 if (cbdata->listed_flows >= cbdata->n_flows)
1062 return cbdata->listed_flows;
1066 static int do_list_flows(struct datapath *dp, const struct odp_flowvec *flowvec)
1068 struct list_flows_cbdata cbdata;
1071 if (!flowvec->n_flows)
1075 cbdata.uflows = (struct odp_flow __user __force*)flowvec->flows;
1076 cbdata.n_flows = flowvec->n_flows;
1077 cbdata.listed_flows = 0;
1079 error = tbl_foreach(get_table_protected(dp), list_flow, &cbdata);
1080 return error ? error : cbdata.listed_flows;
1083 static int do_flowvec_ioctl(struct datapath *dp, unsigned long argp,
1084 int (*function)(struct datapath *,
1085 const struct odp_flowvec *))
1087 struct odp_flowvec __user *uflowvec;
1088 struct odp_flowvec flowvec;
1091 uflowvec = (struct odp_flowvec __user *)argp;
1092 if (copy_from_user(&flowvec, uflowvec, sizeof flowvec))
1095 if (flowvec.n_flows > INT_MAX / sizeof(struct odp_flow))
1098 retval = function(dp, &flowvec);
1099 return (retval < 0 ? retval
1100 : retval == flowvec.n_flows ? 0
1101 : put_user(retval, &uflowvec->n_flows));
1104 static int do_execute(struct datapath *dp, const struct odp_execute *execute)
1106 struct odp_flow_key key;
1107 struct sk_buff *skb;
1108 struct sw_flow_actions *actions;
1114 if (execute->length < ETH_HLEN || execute->length > 65535)
1117 actions = flow_actions_alloc(execute->actions_len);
1118 if (IS_ERR(actions)) {
1119 err = PTR_ERR(actions);
1124 if (copy_from_user(actions->actions,
1125 (struct nlattr __user __force *)execute->actions, execute->actions_len))
1126 goto error_free_actions;
1128 err = validate_actions(actions->actions, execute->actions_len);
1130 goto error_free_actions;
1133 skb = alloc_skb(execute->length, GFP_KERNEL);
1135 goto error_free_actions;
1138 if (copy_from_user(skb_put(skb, execute->length),
1139 (const void __user __force *)execute->data,
1141 goto error_free_skb;
1143 skb_reset_mac_header(skb);
1146 /* Normally, setting the skb 'protocol' field would be handled by a
1147 * call to eth_type_trans(), but it assumes there's a sending
1148 * device, which we may not have. */
1149 if (ntohs(eth->h_proto) >= 1536)
1150 skb->protocol = eth->h_proto;
1152 skb->protocol = htons(ETH_P_802_2);
1154 err = flow_extract(skb, -1, &key, &is_frag);
1156 goto error_free_skb;
1159 err = execute_actions(dp, skb, &key, actions->actions, actions->actions_len);
1173 static int execute_packet(struct datapath *dp, const struct odp_execute __user *executep)
1175 struct odp_execute execute;
1177 if (copy_from_user(&execute, executep, sizeof execute))
1180 return do_execute(dp, &execute);
1183 static int get_dp_stats(struct datapath *dp, struct odp_stats __user *statsp)
1185 struct tbl *table = get_table_protected(dp);
1186 struct odp_stats stats;
1189 stats.n_flows = tbl_count(table);
1190 stats.cur_capacity = tbl_n_buckets(table);
1191 stats.max_capacity = TBL_MAX_BUCKETS;
1192 stats.n_ports = dp->n_ports;
1193 stats.max_ports = DP_MAX_PORTS;
1194 stats.n_frags = stats.n_hit = stats.n_missed = stats.n_lost = 0;
1195 for_each_possible_cpu(i) {
1196 const struct dp_stats_percpu *percpu_stats;
1197 struct dp_stats_percpu local_stats;
1200 percpu_stats = per_cpu_ptr(dp->stats_percpu, i);
1203 seqcount = read_seqcount_begin(&percpu_stats->seqlock);
1204 local_stats = *percpu_stats;
1205 } while (read_seqcount_retry(&percpu_stats->seqlock, seqcount));
1207 stats.n_frags += local_stats.n_frags;
1208 stats.n_hit += local_stats.n_hit;
1209 stats.n_missed += local_stats.n_missed;
1210 stats.n_lost += local_stats.n_lost;
1212 stats.max_miss_queue = DP_MAX_QUEUE_LEN;
1213 stats.max_action_queue = DP_MAX_QUEUE_LEN;
1214 return copy_to_user(statsp, &stats, sizeof stats) ? -EFAULT : 0;
1217 /* MTU of the dp pseudo-device: ETH_DATA_LEN or the minimum of the ports */
1218 int dp_min_mtu(const struct datapath *dp)
1225 list_for_each_entry_rcu (p, &dp->port_list, node) {
1228 /* Skip any internal ports, since that's what we're trying to
1230 if (is_internal_vport(p))
1233 dev_mtu = vport_get_mtu(p);
1234 if (!mtu || dev_mtu < mtu)
1238 return mtu ? mtu : ETH_DATA_LEN;
1241 /* Sets the MTU of all datapath devices to the minimum of the ports. Must
1242 * be called with RTNL lock. */
1243 void set_internal_devs_mtu(const struct datapath *dp)
1250 mtu = dp_min_mtu(dp);
1252 list_for_each_entry_rcu (p, &dp->port_list, node) {
1253 if (is_internal_vport(p))
1254 vport_set_mtu(p, mtu);
1258 static int put_port(const struct vport *p, struct odp_port __user *uop)
1262 memset(&op, 0, sizeof op);
1265 strncpy(op.devname, vport_get_name(p), sizeof op.devname);
1266 strncpy(op.type, vport_get_type(p), sizeof op.type);
1267 vport_get_config(p, op.config);
1270 op.port = p->port_no;
1272 return copy_to_user(uop, &op, sizeof op) ? -EFAULT : 0;
1275 static int query_port(struct datapath *dp, struct odp_port __user *uport)
1277 struct odp_port port;
1278 struct vport *vport;
1280 if (copy_from_user(&port, uport, sizeof port))
1283 if (port.devname[0]) {
1284 port.devname[IFNAMSIZ - 1] = '\0';
1287 vport = vport_locate(port.devname);
1292 if (vport->dp != dp)
1295 if (port.port >= DP_MAX_PORTS)
1298 vport = get_vport_protected(dp, port.port);
1303 return put_port(vport, uport);
1306 static int do_list_ports(struct datapath *dp, struct odp_port __user *uports,
1313 list_for_each_entry_rcu (p, &dp->port_list, node) {
1314 if (put_port(p, &uports[idx]))
1316 if (idx++ >= n_ports)
1323 static int list_ports(struct datapath *dp, struct odp_portvec __user *upv)
1325 struct odp_portvec pv;
1328 if (copy_from_user(&pv, upv, sizeof pv))
1331 retval = do_list_ports(dp, (struct odp_port __user __force *)pv.ports,
1336 return put_user(retval, &upv->n_ports);
1339 static int get_listen_mask(const struct file *f)
1341 return (long)f->private_data;
1344 static void set_listen_mask(struct file *f, int listen_mask)
1346 f->private_data = (void*)(long)listen_mask;
1349 static long openvswitch_ioctl(struct file *f, unsigned int cmd,
1352 int dp_idx = iminor(f->f_dentry->d_inode);
1353 struct datapath *dp;
1354 int drop_frags, listeners, port_no;
1355 unsigned int sflow_probability;
1358 /* Handle commands with special locking requirements up front. */
1361 err = create_dp(dp_idx, (char __user *)argp);
1364 case ODP_DP_DESTROY:
1365 err = destroy_dp(dp_idx);
1368 case ODP_VPORT_ATTACH:
1369 err = attach_port(dp_idx, (struct odp_port __user *)argp);
1372 case ODP_VPORT_DETACH:
1373 err = get_user(port_no, (int __user *)argp);
1375 err = detach_port(dp_idx, port_no);
1379 err = vport_user_mod((struct odp_port __user *)argp);
1382 case ODP_VPORT_STATS_GET:
1383 err = vport_user_stats_get((struct odp_vport_stats_req __user *)argp);
1386 case ODP_VPORT_STATS_SET:
1387 err = vport_user_stats_set((struct odp_vport_stats_req __user *)argp);
1390 case ODP_VPORT_ETHER_GET:
1391 err = vport_user_ether_get((struct odp_vport_ether __user *)argp);
1394 case ODP_VPORT_ETHER_SET:
1395 err = vport_user_ether_set((struct odp_vport_ether __user *)argp);
1398 case ODP_VPORT_MTU_GET:
1399 err = vport_user_mtu_get((struct odp_vport_mtu __user *)argp);
1402 case ODP_VPORT_MTU_SET:
1403 err = vport_user_mtu_set((struct odp_vport_mtu __user *)argp);
1407 dp = get_dp_locked(dp_idx);
1414 err = get_dp_stats(dp, (struct odp_stats __user *)argp);
1417 case ODP_GET_DROP_FRAGS:
1418 err = put_user(dp->drop_frags, (int __user *)argp);
1421 case ODP_SET_DROP_FRAGS:
1422 err = get_user(drop_frags, (int __user *)argp);
1426 if (drop_frags != 0 && drop_frags != 1)
1428 dp->drop_frags = drop_frags;
1432 case ODP_GET_LISTEN_MASK:
1433 err = put_user(get_listen_mask(f), (int __user *)argp);
1436 case ODP_SET_LISTEN_MASK:
1437 err = get_user(listeners, (int __user *)argp);
1441 if (listeners & ~ODPL_ALL)
1444 set_listen_mask(f, listeners);
1447 case ODP_GET_SFLOW_PROBABILITY:
1448 err = put_user(dp->sflow_probability, (unsigned int __user *)argp);
1451 case ODP_SET_SFLOW_PROBABILITY:
1452 err = get_user(sflow_probability, (unsigned int __user *)argp);
1454 dp->sflow_probability = sflow_probability;
1457 case ODP_VPORT_QUERY:
1458 err = query_port(dp, (struct odp_port __user *)argp);
1461 case ODP_VPORT_LIST:
1462 err = list_ports(dp, (struct odp_portvec __user *)argp);
1465 case ODP_FLOW_FLUSH:
1466 err = flush_flows(dp);
1470 err = put_flow(dp, (struct odp_flow_put __user *)argp);
1474 err = del_flow(dp, (struct odp_flow __user *)argp);
1478 err = do_flowvec_ioctl(dp, argp, do_query_flows);
1482 err = do_flowvec_ioctl(dp, argp, do_list_flows);
1486 err = execute_packet(dp, (struct odp_execute __user *)argp);
1493 mutex_unlock(&dp->mutex);
1498 static int dp_has_packet_of_interest(struct datapath *dp, int listeners)
1501 for (i = 0; i < DP_N_QUEUES; i++) {
1502 if (listeners & (1 << i) && !skb_queue_empty(&dp->queues[i]))
1508 #ifdef CONFIG_COMPAT
1509 static int compat_list_ports(struct datapath *dp, struct compat_odp_portvec __user *upv)
1511 struct compat_odp_portvec pv;
1514 if (copy_from_user(&pv, upv, sizeof pv))
1517 retval = do_list_ports(dp, compat_ptr(pv.ports), pv.n_ports);
1521 return put_user(retval, &upv->n_ports);
1524 static int compat_get_flow(struct odp_flow *flow, const struct compat_odp_flow __user *compat)
1526 compat_uptr_t actions;
1528 if (!access_ok(VERIFY_READ, compat, sizeof(struct compat_odp_flow)) ||
1529 __copy_from_user(&flow->stats, &compat->stats, sizeof(struct odp_flow_stats)) ||
1530 __copy_from_user(&flow->key, &compat->key, sizeof(struct odp_flow_key)) ||
1531 __get_user(actions, &compat->actions) ||
1532 __get_user(flow->actions_len, &compat->actions_len) ||
1533 __get_user(flow->flags, &compat->flags))
1536 flow->actions = (struct nlattr __force *)compat_ptr(actions);
1540 static int compat_put_flow(struct datapath *dp, struct compat_odp_flow_put __user *ufp)
1542 struct odp_flow_stats stats;
1543 struct odp_flow_put fp;
1546 if (compat_get_flow(&fp.flow, &ufp->flow) ||
1547 get_user(fp.flags, &ufp->flags))
1550 error = do_put_flow(dp, &fp, &stats);
1554 if (copy_to_user(&ufp->flow.stats, &stats,
1555 sizeof(struct odp_flow_stats)))
1561 static int compat_answer_query(struct datapath *dp, struct sw_flow *flow,
1563 struct compat_odp_flow __user *ufp)
1565 compat_uptr_t actions;
1567 if (get_user(actions, &ufp->actions))
1570 return do_answer_query(dp, flow, query_flags, &ufp->stats,
1571 compat_ptr(actions), &ufp->actions_len);
1574 static int compat_del_flow(struct datapath *dp, struct compat_odp_flow __user *ufp)
1576 struct sw_flow *flow;
1580 if (compat_get_flow(&uf, ufp))
1583 flow = do_del_flow(dp, &uf.key);
1585 return PTR_ERR(flow);
1587 error = compat_answer_query(dp, flow, 0, ufp);
1588 flow_deferred_free(flow);
1592 static int compat_query_flows(struct datapath *dp,
1593 struct compat_odp_flow __user *flows,
1596 struct tbl *table = get_table_protected(dp);
1599 for (i = 0; i < n_flows; i++) {
1600 struct compat_odp_flow __user *ufp = &flows[i];
1602 struct tbl_node *flow_node;
1605 if (compat_get_flow(&uf, ufp))
1608 flow_node = tbl_lookup(table, &uf.key, flow_hash(&uf.key), flow_cmp);
1610 error = put_user(ENOENT, &ufp->stats.error);
1612 error = compat_answer_query(dp, flow_cast(flow_node),
1620 struct compat_list_flows_cbdata {
1621 struct datapath *dp;
1622 struct compat_odp_flow __user *uflows;
1627 static int compat_list_flow(struct tbl_node *node, void *cbdata_)
1629 struct sw_flow *flow = flow_cast(node);
1630 struct compat_list_flows_cbdata *cbdata = cbdata_;
1631 struct compat_odp_flow __user *ufp = &cbdata->uflows[cbdata->listed_flows++];
1634 if (copy_to_user(&ufp->key, &flow->key, sizeof flow->key))
1636 error = compat_answer_query(cbdata->dp, flow, 0, ufp);
1640 if (cbdata->listed_flows >= cbdata->n_flows)
1641 return cbdata->listed_flows;
1645 static int compat_list_flows(struct datapath *dp,
1646 struct compat_odp_flow __user *flows, u32 n_flows)
1648 struct compat_list_flows_cbdata cbdata;
1655 cbdata.uflows = flows;
1656 cbdata.n_flows = n_flows;
1657 cbdata.listed_flows = 0;
1659 error = tbl_foreach(get_table_protected(dp), compat_list_flow, &cbdata);
1660 return error ? error : cbdata.listed_flows;
1663 static int compat_flowvec_ioctl(struct datapath *dp, unsigned long argp,
1664 int (*function)(struct datapath *,
1665 struct compat_odp_flow __user *,
1668 struct compat_odp_flowvec __user *uflowvec;
1669 struct compat_odp_flow __user *flows;
1670 struct compat_odp_flowvec flowvec;
1673 uflowvec = compat_ptr(argp);
1674 if (!access_ok(VERIFY_WRITE, uflowvec, sizeof *uflowvec) ||
1675 copy_from_user(&flowvec, uflowvec, sizeof flowvec))
1678 if (flowvec.n_flows > INT_MAX / sizeof(struct compat_odp_flow))
1681 flows = compat_ptr(flowvec.flows);
1682 if (!access_ok(VERIFY_WRITE, flows,
1683 flowvec.n_flows * sizeof(struct compat_odp_flow)))
1686 retval = function(dp, flows, flowvec.n_flows);
1687 return (retval < 0 ? retval
1688 : retval == flowvec.n_flows ? 0
1689 : put_user(retval, &uflowvec->n_flows));
1692 static int compat_execute(struct datapath *dp, const struct compat_odp_execute __user *uexecute)
1694 struct odp_execute execute;
1695 compat_uptr_t actions;
1698 if (!access_ok(VERIFY_READ, uexecute, sizeof(struct compat_odp_execute)) ||
1699 __get_user(actions, &uexecute->actions) ||
1700 __get_user(execute.actions_len, &uexecute->actions_len) ||
1701 __get_user(data, &uexecute->data) ||
1702 __get_user(execute.length, &uexecute->length))
1705 execute.actions = (struct nlattr __force *)compat_ptr(actions);
1706 execute.data = (const void __force *)compat_ptr(data);
1708 return do_execute(dp, &execute);
1711 static long openvswitch_compat_ioctl(struct file *f, unsigned int cmd, unsigned long argp)
1713 int dp_idx = iminor(f->f_dentry->d_inode);
1714 struct datapath *dp;
1718 case ODP_DP_DESTROY:
1719 case ODP_FLOW_FLUSH:
1720 /* Ioctls that don't need any translation at all. */
1721 return openvswitch_ioctl(f, cmd, argp);
1724 case ODP_VPORT_ATTACH:
1725 case ODP_VPORT_DETACH:
1727 case ODP_VPORT_MTU_SET:
1728 case ODP_VPORT_MTU_GET:
1729 case ODP_VPORT_ETHER_SET:
1730 case ODP_VPORT_ETHER_GET:
1731 case ODP_VPORT_STATS_SET:
1732 case ODP_VPORT_STATS_GET:
1734 case ODP_GET_DROP_FRAGS:
1735 case ODP_SET_DROP_FRAGS:
1736 case ODP_SET_LISTEN_MASK:
1737 case ODP_GET_LISTEN_MASK:
1738 case ODP_SET_SFLOW_PROBABILITY:
1739 case ODP_GET_SFLOW_PROBABILITY:
1740 case ODP_VPORT_QUERY:
1741 /* Ioctls that just need their pointer argument extended. */
1742 return openvswitch_ioctl(f, cmd, (unsigned long)compat_ptr(argp));
1745 dp = get_dp_locked(dp_idx);
1751 case ODP_VPORT_LIST32:
1752 err = compat_list_ports(dp, compat_ptr(argp));
1755 case ODP_FLOW_PUT32:
1756 err = compat_put_flow(dp, compat_ptr(argp));
1759 case ODP_FLOW_DEL32:
1760 err = compat_del_flow(dp, compat_ptr(argp));
1763 case ODP_FLOW_GET32:
1764 err = compat_flowvec_ioctl(dp, argp, compat_query_flows);
1767 case ODP_FLOW_LIST32:
1768 err = compat_flowvec_ioctl(dp, argp, compat_list_flows);
1772 err = compat_execute(dp, compat_ptr(argp));
1779 mutex_unlock(&dp->mutex);
1785 /* Unfortunately this function is not exported so this is a verbatim copy
1786 * from net/core/datagram.c in 2.6.30. */
1787 static int skb_copy_and_csum_datagram(const struct sk_buff *skb, int offset,
1788 u8 __user *to, int len,
1791 int start = skb_headlen(skb);
1793 int i, copy = start - offset;
1800 *csump = csum_and_copy_to_user(skb->data + offset, to, copy,
1804 if ((len -= copy) == 0)
1811 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1814 WARN_ON(start > offset + len);
1816 end = start + skb_shinfo(skb)->frags[i].size;
1817 if ((copy = end - offset) > 0) {
1821 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
1822 struct page *page = frag->page;
1827 csum2 = csum_and_copy_to_user(vaddr +
1834 *csump = csum_block_add(*csump, csum2, pos);
1844 if (skb_shinfo(skb)->frag_list) {
1845 struct sk_buff *list = skb_shinfo(skb)->frag_list;
1847 for (; list; list=list->next) {
1850 WARN_ON(start > offset + len);
1852 end = start + list->len;
1853 if ((copy = end - offset) > 0) {
1857 if (skb_copy_and_csum_datagram(list,
1862 *csump = csum_block_add(*csump, csum2, pos);
1863 if ((len -= copy) == 0)
1879 static ssize_t openvswitch_read(struct file *f, char __user *buf,
1880 size_t nbytes, loff_t *ppos)
1882 int listeners = get_listen_mask(f);
1883 int dp_idx = iminor(f->f_dentry->d_inode);
1884 struct datapath *dp = get_dp_locked(dp_idx);
1885 struct sk_buff *skb;
1886 size_t copy_bytes, tot_copy_bytes;
1892 if (nbytes == 0 || !listeners)
1898 for (i = 0; i < DP_N_QUEUES; i++) {
1899 if (listeners & (1 << i)) {
1900 skb = skb_dequeue(&dp->queues[i]);
1906 if (f->f_flags & O_NONBLOCK) {
1911 wait_event_interruptible(dp->waitqueue,
1912 dp_has_packet_of_interest(dp,
1915 if (signal_pending(current)) {
1916 retval = -ERESTARTSYS;
1921 mutex_unlock(&dp->mutex);
1923 copy_bytes = tot_copy_bytes = min_t(size_t, skb->len, nbytes);
1926 if (skb->ip_summed == CHECKSUM_PARTIAL) {
1927 if (copy_bytes == skb->len) {
1929 u16 csum_start, csum_offset;
1931 get_skb_csum_pointers(skb, &csum_start, &csum_offset);
1932 csum_start -= skb_headroom(skb);
1934 BUG_ON(csum_start >= skb_headlen(skb));
1935 retval = skb_copy_and_csum_datagram(skb, csum_start, buf + csum_start,
1936 copy_bytes - csum_start, &csum);
1938 __sum16 __user *csump;
1940 copy_bytes = csum_start;
1941 csump = (__sum16 __user *)(buf + csum_start + csum_offset);
1943 BUG_ON((char __user *)csump + sizeof(__sum16) >
1945 put_user(csum_fold(csum), csump);
1948 retval = skb_checksum_help(skb);
1955 iov.iov_len = copy_bytes;
1956 retval = skb_copy_datagram_iovec(skb, 0, &iov, iov.iov_len);
1960 retval = tot_copy_bytes;
1966 mutex_unlock(&dp->mutex);
1970 static unsigned int openvswitch_poll(struct file *file, poll_table *wait)
1972 int dp_idx = iminor(file->f_dentry->d_inode);
1973 struct datapath *dp = get_dp_locked(dp_idx);
1978 poll_wait(file, &dp->waitqueue, wait);
1979 if (dp_has_packet_of_interest(dp, get_listen_mask(file)))
1980 mask |= POLLIN | POLLRDNORM;
1981 mutex_unlock(&dp->mutex);
1983 mask = POLLIN | POLLRDNORM | POLLHUP;
1988 static struct file_operations openvswitch_fops = {
1989 .read = openvswitch_read,
1990 .poll = openvswitch_poll,
1991 .unlocked_ioctl = openvswitch_ioctl,
1992 #ifdef CONFIG_COMPAT
1993 .compat_ioctl = openvswitch_compat_ioctl,
1999 static int __init dp_init(void)
2001 struct sk_buff *dummy_skb;
2004 BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > sizeof(dummy_skb->cb));
2006 printk("Open vSwitch %s, built "__DATE__" "__TIME__"\n", VERSION BUILDNR);
2014 goto error_flow_exit;
2016 err = register_netdevice_notifier(&dp_device_notifier);
2018 goto error_vport_exit;
2020 major = register_chrdev(0, "openvswitch", &openvswitch_fops);
2022 goto error_unreg_notifier;
2026 error_unreg_notifier:
2027 unregister_netdevice_notifier(&dp_device_notifier);
2036 static void dp_cleanup(void)
2039 unregister_chrdev(major, "openvswitch");
2040 unregister_netdevice_notifier(&dp_device_notifier);
2045 module_init(dp_init);
2046 module_exit(dp_cleanup);
2048 MODULE_DESCRIPTION("Open vSwitch switching datapath");
2049 MODULE_LICENSE("GPL");