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 mutex_lock(&dp->mutex);
326 list_for_each_entry_safe (p, n, &dp->port_list, node)
327 if (p->port_no != ODPP_LOCAL)
332 rcu_assign_pointer(dps[dp->dp_idx], NULL);
334 dp_detach_port(get_vport_protected(dp, ODPP_LOCAL));
335 tbl_destroy(get_table_protected(dp), flow_free_tbl);
337 for (i = 0; i < DP_N_QUEUES; i++)
338 skb_queue_purge(&dp->queues[i]);
339 free_percpu(dp->stats_percpu);
341 mutex_unlock(&dp->mutex);
342 kobject_put(&dp->ifobj);
343 module_put(THIS_MODULE);
346 mutex_unlock(&dp_mutex);
351 /* Called with RTNL lock and dp_mutex. */
352 static int new_vport(struct datapath *dp, struct odp_port *odp_port, int port_no)
354 struct vport_parms parms;
357 parms.name = odp_port->devname;
358 parms.type = odp_port->type;
359 parms.config = odp_port->config;
361 parms.port_no = port_no;
364 vport = vport_add(&parms);
368 return PTR_ERR(vport);
370 rcu_assign_pointer(dp->ports[port_no], vport);
371 list_add_rcu(&vport->node, &dp->port_list);
374 dp_ifinfo_notify(RTM_NEWLINK, vport);
379 static int attach_port(int dp_idx, struct odp_port __user *portp)
382 struct odp_port port;
387 if (copy_from_user(&port, portp, sizeof port))
389 port.devname[IFNAMSIZ - 1] = '\0';
390 port.type[VPORT_TYPE_SIZE - 1] = '\0';
393 dp = get_dp_locked(dp_idx);
396 goto out_unlock_rtnl;
398 for (port_no = 1; port_no < DP_MAX_PORTS; port_no++)
399 if (!dp->ports[port_no])
405 err = new_vport(dp, &port, port_no);
409 set_internal_devs_mtu(dp);
410 dp_sysfs_add_if(get_vport_protected(dp, port_no));
412 err = put_user(port_no, &portp->port);
415 mutex_unlock(&dp->mutex);
422 int dp_detach_port(struct vport *p)
428 if (p->port_no != ODPP_LOCAL)
430 dp_ifinfo_notify(RTM_DELLINK, p);
432 /* First drop references to device. */
434 list_del_rcu(&p->node);
435 rcu_assign_pointer(p->dp->ports[p->port_no], NULL);
437 /* Then destroy it. */
445 static int detach_port(int dp_idx, int port_no)
452 if (port_no < 0 || port_no >= DP_MAX_PORTS || port_no == ODPP_LOCAL)
456 dp = get_dp_locked(dp_idx);
459 goto out_unlock_rtnl;
461 p = get_vport_protected(dp, port_no);
466 err = dp_detach_port(p);
469 mutex_unlock(&dp->mutex);
476 /* Must be called with rcu_read_lock. */
477 void dp_process_received_packet(struct vport *p, struct sk_buff *skb)
479 struct datapath *dp = p->dp;
480 struct dp_stats_percpu *stats;
481 int stats_counter_off;
482 struct sw_flow_actions *acts;
483 struct loop_counter *loop;
486 OVS_CB(skb)->vport = p;
488 if (!OVS_CB(skb)->flow) {
489 struct odp_flow_key key;
490 struct tbl_node *flow_node;
493 /* Extract flow from 'skb' into 'key'. */
494 error = flow_extract(skb, p ? p->port_no : ODPP_NONE, &key, &is_frag);
495 if (unlikely(error)) {
500 if (is_frag && dp->drop_frags) {
502 stats_counter_off = offsetof(struct dp_stats_percpu, n_frags);
507 flow_node = tbl_lookup(rcu_dereference(dp->table), &key,
508 flow_hash(&key), flow_cmp);
509 if (unlikely(!flow_node)) {
510 dp_output_control(dp, skb, _ODPL_MISS_NR,
511 (__force u64)OVS_CB(skb)->tun_id);
512 stats_counter_off = offsetof(struct dp_stats_percpu, n_missed);
516 OVS_CB(skb)->flow = flow_cast(flow_node);
519 stats_counter_off = offsetof(struct dp_stats_percpu, n_hit);
520 flow_used(OVS_CB(skb)->flow, skb);
522 acts = rcu_dereference(OVS_CB(skb)->flow->sf_acts);
524 /* Check whether we've looped too much. */
525 loop = loop_get_counter();
526 if (unlikely(++loop->count > MAX_LOOPS))
527 loop->looping = true;
528 if (unlikely(loop->looping)) {
529 loop_suppress(dp, acts);
534 /* Execute actions. */
535 execute_actions(dp, skb, &OVS_CB(skb)->flow->key, acts->actions,
538 /* Check whether sub-actions looped too much. */
539 if (unlikely(loop->looping))
540 loop_suppress(dp, acts);
543 /* Decrement loop counter. */
545 loop->looping = false;
549 /* Update datapath statistics. */
551 stats = per_cpu_ptr(dp->stats_percpu, smp_processor_id());
553 write_seqcount_begin(&stats->seqlock);
554 (*(u64 *)((u8 *)stats + stats_counter_off))++;
555 write_seqcount_end(&stats->seqlock);
560 /* Append each packet in 'skb' list to 'queue'. There will be only one packet
561 * unless we broke up a GSO packet. */
562 static int queue_control_packets(struct sk_buff *skb, struct sk_buff_head *queue,
563 int queue_no, u64 arg)
565 struct sk_buff *nskb;
569 if (OVS_CB(skb)->vport)
570 port_no = OVS_CB(skb)->vport->port_no;
572 port_no = ODPP_LOCAL;
575 struct odp_msg *header;
580 err = skb_cow(skb, sizeof *header);
584 header = (struct odp_msg*)__skb_push(skb, sizeof *header);
585 header->type = queue_no;
586 header->length = skb->len;
587 header->port = port_no;
589 skb_queue_tail(queue, skb);
597 while ((skb = nskb) != NULL) {
604 int dp_output_control(struct datapath *dp, struct sk_buff *skb, int queue_no,
607 struct dp_stats_percpu *stats;
608 struct sk_buff_head *queue;
611 WARN_ON_ONCE(skb_shared(skb));
612 BUG_ON(queue_no != _ODPL_MISS_NR && queue_no != _ODPL_ACTION_NR && queue_no != _ODPL_SFLOW_NR);
613 queue = &dp->queues[queue_no];
615 if (skb_queue_len(queue) >= DP_MAX_QUEUE_LEN)
618 forward_ip_summed(skb);
620 err = vswitch_skb_checksum_setup(skb);
624 /* Break apart GSO packets into their component pieces. Otherwise
625 * userspace may try to stuff a 64kB packet into a 1500-byte MTU. */
626 if (skb_is_gso(skb)) {
627 struct sk_buff *nskb = skb_gso_segment(skb, NETIF_F_SG | NETIF_F_HW_CSUM);
637 err = queue_control_packets(skb, queue, queue_no, arg);
638 wake_up_interruptible(&dp->waitqueue);
645 stats = per_cpu_ptr(dp->stats_percpu, smp_processor_id());
647 write_seqcount_begin(&stats->seqlock);
649 write_seqcount_end(&stats->seqlock);
656 static int flush_flows(struct datapath *dp)
658 struct tbl *old_table = get_table_protected(dp);
659 struct tbl *new_table;
661 new_table = tbl_create(TBL_MIN_BUCKETS);
665 rcu_assign_pointer(dp->table, new_table);
667 tbl_deferred_destroy(old_table, flow_free_tbl);
672 static int validate_actions(const struct nlattr *actions, u32 actions_len)
674 const struct nlattr *a;
677 nla_for_each_attr(a, actions, actions_len, rem) {
678 static const u32 action_lens[ODPAT_MAX + 1] = {
680 [ODPAT_CONTROLLER] = 8,
681 [ODPAT_SET_DL_TCI] = 2,
682 [ODPAT_STRIP_VLAN] = 0,
683 [ODPAT_SET_DL_SRC] = ETH_ALEN,
684 [ODPAT_SET_DL_DST] = ETH_ALEN,
685 [ODPAT_SET_NW_SRC] = 4,
686 [ODPAT_SET_NW_DST] = 4,
687 [ODPAT_SET_NW_TOS] = 1,
688 [ODPAT_SET_TP_SRC] = 2,
689 [ODPAT_SET_TP_DST] = 2,
690 [ODPAT_SET_TUNNEL] = 8,
691 [ODPAT_SET_PRIORITY] = 4,
692 [ODPAT_POP_PRIORITY] = 0,
693 [ODPAT_DROP_SPOOFED_ARP] = 0,
695 int type = nla_type(a);
697 if (type > ODPAT_MAX || nla_len(a) != action_lens[type])
704 case ODPAT_CONTROLLER:
705 case ODPAT_STRIP_VLAN:
706 case ODPAT_SET_DL_SRC:
707 case ODPAT_SET_DL_DST:
708 case ODPAT_SET_NW_SRC:
709 case ODPAT_SET_NW_DST:
710 case ODPAT_SET_TP_SRC:
711 case ODPAT_SET_TP_DST:
712 case ODPAT_SET_TUNNEL:
713 case ODPAT_SET_PRIORITY:
714 case ODPAT_POP_PRIORITY:
715 case ODPAT_DROP_SPOOFED_ARP:
716 /* No validation needed. */
720 if (nla_get_u32(a) >= DP_MAX_PORTS)
723 case ODPAT_SET_DL_TCI:
724 if (nla_get_be16(a) & htons(VLAN_CFI_MASK))
728 case ODPAT_SET_NW_TOS:
729 if (nla_get_u8(a) & INET_ECN_MASK)
744 static struct sw_flow_actions *get_actions(const struct odp_flow *flow)
746 struct sw_flow_actions *actions;
749 actions = flow_actions_alloc(flow->actions_len);
750 error = PTR_ERR(actions);
755 if (copy_from_user(actions->actions,
756 (struct nlattr __user __force *)flow->actions,
758 goto error_free_actions;
759 error = validate_actions(actions->actions, actions->actions_len);
761 goto error_free_actions;
768 return ERR_PTR(error);
771 static void get_stats(struct sw_flow *flow, struct odp_flow_stats *stats)
774 struct timespec offset_ts, used, now_mono;
776 ktime_get_ts(&now_mono);
777 jiffies_to_timespec(jiffies - flow->used, &offset_ts);
778 set_normalized_timespec(&used, now_mono.tv_sec - offset_ts.tv_sec,
779 now_mono.tv_nsec - offset_ts.tv_nsec);
781 stats->used_sec = used.tv_sec;
782 stats->used_nsec = used.tv_nsec;
785 stats->used_nsec = 0;
788 stats->n_packets = flow->packet_count;
789 stats->n_bytes = flow->byte_count;
791 stats->tcp_flags = flow->tcp_flags;
795 static void clear_stats(struct sw_flow *flow)
799 flow->packet_count = 0;
800 flow->byte_count = 0;
803 static int expand_table(struct datapath *dp)
805 struct tbl *old_table = get_table_protected(dp);
806 struct tbl *new_table;
808 new_table = tbl_expand(old_table);
809 if (IS_ERR(new_table))
810 return PTR_ERR(new_table);
812 rcu_assign_pointer(dp->table, new_table);
813 tbl_deferred_destroy(old_table, NULL);
818 static int do_put_flow(struct datapath *dp, struct odp_flow_put *uf,
819 struct odp_flow_stats *stats)
821 struct tbl_node *flow_node;
822 struct sw_flow *flow;
824 struct sw_flow_actions *acts = NULL;
828 hash = flow_hash(&uf->flow.key);
829 table = get_table_protected(dp);
830 flow_node = tbl_lookup(table, &uf->flow.key, hash, flow_cmp);
834 if (!(uf->flags & ODPPF_CREATE))
837 /* Expand table, if necessary, to make room. */
838 if (tbl_count(table) >= tbl_n_buckets(table)) {
839 error = expand_table(dp);
842 table = get_table_protected(dp);
848 error = PTR_ERR(flow);
851 flow->key = uf->flow.key;
854 /* Obtain actions. */
855 acts = get_actions(&uf->flow);
856 error = PTR_ERR(acts);
858 goto error_free_flow;
859 rcu_assign_pointer(flow->sf_acts, acts);
861 /* Put flow in bucket. */
862 error = tbl_insert(table, &flow->tbl_node, hash);
864 goto error_free_flow_acts;
866 memset(stats, 0, sizeof(struct odp_flow_stats));
868 /* We found a matching flow. */
869 struct sw_flow_actions *old_acts, *new_acts;
871 flow = flow_cast(flow_node);
873 /* Bail out if we're not allowed to modify an existing flow. */
875 if (!(uf->flags & ODPPF_MODIFY))
879 new_acts = get_actions(&uf->flow);
880 error = PTR_ERR(new_acts);
881 if (IS_ERR(new_acts))
884 old_acts = rcu_dereference_protected(flow->sf_acts,
885 lockdep_is_held(&dp->mutex));
886 if (old_acts->actions_len != new_acts->actions_len ||
887 memcmp(old_acts->actions, new_acts->actions,
888 old_acts->actions_len)) {
889 rcu_assign_pointer(flow->sf_acts, new_acts);
890 flow_deferred_free_acts(old_acts);
895 /* Fetch stats, then clear them if necessary. */
896 spin_lock_bh(&flow->lock);
897 get_stats(flow, stats);
898 if (uf->flags & ODPPF_ZERO_STATS)
900 spin_unlock_bh(&flow->lock);
905 error_free_flow_acts:
908 flow->sf_acts = NULL;
914 static int put_flow(struct datapath *dp, struct odp_flow_put __user *ufp)
916 struct odp_flow_stats stats;
917 struct odp_flow_put uf;
920 if (copy_from_user(&uf, ufp, sizeof(struct odp_flow_put)))
923 error = do_put_flow(dp, &uf, &stats);
927 if (copy_to_user(&ufp->flow.stats, &stats,
928 sizeof(struct odp_flow_stats)))
934 static int do_answer_query(struct datapath *dp, struct sw_flow *flow,
936 struct odp_flow_stats __user *ustats,
937 struct nlattr __user *actions,
938 u32 __user *actions_lenp)
940 struct sw_flow_actions *sf_acts;
941 struct odp_flow_stats stats;
944 spin_lock_bh(&flow->lock);
945 get_stats(flow, &stats);
946 if (query_flags & ODPFF_ZERO_TCP_FLAGS)
949 spin_unlock_bh(&flow->lock);
951 if (copy_to_user(ustats, &stats, sizeof(struct odp_flow_stats)) ||
952 get_user(actions_len, actions_lenp))
958 sf_acts = rcu_dereference_protected(flow->sf_acts,
959 lockdep_is_held(&dp->mutex));
960 if (put_user(sf_acts->actions_len, actions_lenp) ||
961 (actions && copy_to_user(actions, sf_acts->actions,
962 min(sf_acts->actions_len, actions_len))))
968 static int answer_query(struct datapath *dp, struct sw_flow *flow,
969 u32 query_flags, struct odp_flow __user *ufp)
971 struct nlattr __user *actions;
973 if (get_user(actions, (struct nlattr __user * __user *)&ufp->actions))
976 return do_answer_query(dp, flow, query_flags,
977 &ufp->stats, actions, &ufp->actions_len);
980 static struct sw_flow *do_del_flow(struct datapath *dp, struct odp_flow_key *key)
982 struct tbl *table = get_table_protected(dp);
983 struct tbl_node *flow_node;
986 flow_node = tbl_lookup(table, key, flow_hash(key), flow_cmp);
988 return ERR_PTR(-ENOENT);
990 error = tbl_remove(table, flow_node);
992 return ERR_PTR(error);
994 /* XXX Returned flow_node's statistics might lose a few packets, since
995 * other CPUs can be using this flow. We used to synchronize_rcu() to
996 * make sure that we get completely accurate stats, but that blows our
997 * performance, badly. */
998 return flow_cast(flow_node);
1001 static int del_flow(struct datapath *dp, struct odp_flow __user *ufp)
1003 struct sw_flow *flow;
1007 if (copy_from_user(&uf, ufp, sizeof uf))
1010 flow = do_del_flow(dp, &uf.key);
1012 return PTR_ERR(flow);
1014 error = answer_query(dp, flow, 0, ufp);
1015 flow_deferred_free(flow);
1019 static int do_query_flows(struct datapath *dp, const struct odp_flowvec *flowvec)
1021 struct tbl *table = get_table_protected(dp);
1024 for (i = 0; i < flowvec->n_flows; i++) {
1025 struct odp_flow __user *ufp = (struct odp_flow __user __force *)&flowvec->flows[i];
1027 struct tbl_node *flow_node;
1030 if (copy_from_user(&uf, ufp, sizeof uf))
1033 flow_node = tbl_lookup(table, &uf.key, flow_hash(&uf.key), flow_cmp);
1035 error = put_user(ENOENT, &ufp->stats.error);
1037 error = answer_query(dp, flow_cast(flow_node), uf.flags, ufp);
1041 return flowvec->n_flows;
1044 struct list_flows_cbdata {
1045 struct datapath *dp;
1046 struct odp_flow __user *uflows;
1051 static int list_flow(struct tbl_node *node, void *cbdata_)
1053 struct sw_flow *flow = flow_cast(node);
1054 struct list_flows_cbdata *cbdata = cbdata_;
1055 struct odp_flow __user *ufp = &cbdata->uflows[cbdata->listed_flows++];
1058 if (copy_to_user(&ufp->key, &flow->key, sizeof flow->key))
1060 error = answer_query(cbdata->dp, flow, 0, ufp);
1064 if (cbdata->listed_flows >= cbdata->n_flows)
1065 return cbdata->listed_flows;
1069 static int do_list_flows(struct datapath *dp, const struct odp_flowvec *flowvec)
1071 struct list_flows_cbdata cbdata;
1074 if (!flowvec->n_flows)
1078 cbdata.uflows = (struct odp_flow __user __force*)flowvec->flows;
1079 cbdata.n_flows = flowvec->n_flows;
1080 cbdata.listed_flows = 0;
1082 error = tbl_foreach(get_table_protected(dp), list_flow, &cbdata);
1083 return error ? error : cbdata.listed_flows;
1086 static int do_flowvec_ioctl(struct datapath *dp, unsigned long argp,
1087 int (*function)(struct datapath *,
1088 const struct odp_flowvec *))
1090 struct odp_flowvec __user *uflowvec;
1091 struct odp_flowvec flowvec;
1094 uflowvec = (struct odp_flowvec __user *)argp;
1095 if (copy_from_user(&flowvec, uflowvec, sizeof flowvec))
1098 if (flowvec.n_flows > INT_MAX / sizeof(struct odp_flow))
1101 retval = function(dp, &flowvec);
1102 return (retval < 0 ? retval
1103 : retval == flowvec.n_flows ? 0
1104 : put_user(retval, &uflowvec->n_flows));
1107 static int do_execute(struct datapath *dp, const struct odp_execute *execute)
1109 struct odp_flow_key key;
1110 struct sk_buff *skb;
1111 struct sw_flow_actions *actions;
1117 if (execute->length < ETH_HLEN || execute->length > 65535)
1120 actions = flow_actions_alloc(execute->actions_len);
1121 if (IS_ERR(actions)) {
1122 err = PTR_ERR(actions);
1127 if (copy_from_user(actions->actions,
1128 (struct nlattr __user __force *)execute->actions, execute->actions_len))
1129 goto error_free_actions;
1131 err = validate_actions(actions->actions, execute->actions_len);
1133 goto error_free_actions;
1136 skb = alloc_skb(execute->length, GFP_KERNEL);
1138 goto error_free_actions;
1141 if (copy_from_user(skb_put(skb, execute->length),
1142 (const void __user __force *)execute->data,
1144 goto error_free_skb;
1146 skb_reset_mac_header(skb);
1149 /* Normally, setting the skb 'protocol' field would be handled by a
1150 * call to eth_type_trans(), but it assumes there's a sending
1151 * device, which we may not have. */
1152 if (ntohs(eth->h_proto) >= 1536)
1153 skb->protocol = eth->h_proto;
1155 skb->protocol = htons(ETH_P_802_2);
1157 err = flow_extract(skb, -1, &key, &is_frag);
1159 goto error_free_skb;
1162 err = execute_actions(dp, skb, &key, actions->actions, actions->actions_len);
1176 static int execute_packet(struct datapath *dp, const struct odp_execute __user *executep)
1178 struct odp_execute execute;
1180 if (copy_from_user(&execute, executep, sizeof execute))
1183 return do_execute(dp, &execute);
1186 static int get_dp_stats(struct datapath *dp, struct odp_stats __user *statsp)
1188 struct tbl *table = get_table_protected(dp);
1189 struct odp_stats stats;
1192 stats.n_flows = tbl_count(table);
1193 stats.cur_capacity = tbl_n_buckets(table);
1194 stats.max_capacity = TBL_MAX_BUCKETS;
1195 stats.n_ports = dp->n_ports;
1196 stats.max_ports = DP_MAX_PORTS;
1197 stats.n_frags = stats.n_hit = stats.n_missed = stats.n_lost = 0;
1198 for_each_possible_cpu(i) {
1199 const struct dp_stats_percpu *percpu_stats;
1200 struct dp_stats_percpu local_stats;
1203 percpu_stats = per_cpu_ptr(dp->stats_percpu, i);
1206 seqcount = read_seqcount_begin(&percpu_stats->seqlock);
1207 local_stats = *percpu_stats;
1208 } while (read_seqcount_retry(&percpu_stats->seqlock, seqcount));
1210 stats.n_frags += local_stats.n_frags;
1211 stats.n_hit += local_stats.n_hit;
1212 stats.n_missed += local_stats.n_missed;
1213 stats.n_lost += local_stats.n_lost;
1215 stats.max_miss_queue = DP_MAX_QUEUE_LEN;
1216 stats.max_action_queue = DP_MAX_QUEUE_LEN;
1217 return copy_to_user(statsp, &stats, sizeof stats) ? -EFAULT : 0;
1220 /* MTU of the dp pseudo-device: ETH_DATA_LEN or the minimum of the ports */
1221 int dp_min_mtu(const struct datapath *dp)
1228 list_for_each_entry_rcu (p, &dp->port_list, node) {
1231 /* Skip any internal ports, since that's what we're trying to
1233 if (is_internal_vport(p))
1236 dev_mtu = vport_get_mtu(p);
1237 if (!mtu || dev_mtu < mtu)
1241 return mtu ? mtu : ETH_DATA_LEN;
1244 /* Sets the MTU of all datapath devices to the minimum of the ports. Must
1245 * be called with RTNL lock. */
1246 void set_internal_devs_mtu(const struct datapath *dp)
1253 mtu = dp_min_mtu(dp);
1255 list_for_each_entry_rcu (p, &dp->port_list, node) {
1256 if (is_internal_vport(p))
1257 vport_set_mtu(p, mtu);
1261 static int put_port(const struct vport *p, struct odp_port __user *uop)
1265 memset(&op, 0, sizeof op);
1268 strncpy(op.devname, vport_get_name(p), sizeof op.devname);
1269 strncpy(op.type, vport_get_type(p), sizeof op.type);
1270 vport_get_config(p, op.config);
1273 op.port = p->port_no;
1275 return copy_to_user(uop, &op, sizeof op) ? -EFAULT : 0;
1278 static int query_port(struct datapath *dp, struct odp_port __user *uport)
1280 struct odp_port port;
1281 struct vport *vport;
1283 if (copy_from_user(&port, uport, sizeof port))
1286 if (port.devname[0]) {
1287 port.devname[IFNAMSIZ - 1] = '\0';
1290 vport = vport_locate(port.devname);
1295 if (vport->dp != dp)
1298 if (port.port >= DP_MAX_PORTS)
1301 vport = get_vport_protected(dp, port.port);
1306 return put_port(vport, uport);
1309 static int do_list_ports(struct datapath *dp, struct odp_port __user *uports,
1316 list_for_each_entry_rcu (p, &dp->port_list, node) {
1317 if (put_port(p, &uports[idx]))
1319 if (idx++ >= n_ports)
1326 static int list_ports(struct datapath *dp, struct odp_portvec __user *upv)
1328 struct odp_portvec pv;
1331 if (copy_from_user(&pv, upv, sizeof pv))
1334 retval = do_list_ports(dp, (struct odp_port __user __force *)pv.ports,
1339 return put_user(retval, &upv->n_ports);
1342 static int get_listen_mask(const struct file *f)
1344 return (long)f->private_data;
1347 static void set_listen_mask(struct file *f, int listen_mask)
1349 f->private_data = (void*)(long)listen_mask;
1352 static long openvswitch_ioctl(struct file *f, unsigned int cmd,
1355 int dp_idx = iminor(f->f_dentry->d_inode);
1356 struct datapath *dp;
1357 int drop_frags, listeners, port_no;
1358 unsigned int sflow_probability;
1361 /* Handle commands with special locking requirements up front. */
1364 err = create_dp(dp_idx, (char __user *)argp);
1367 case ODP_DP_DESTROY:
1368 err = destroy_dp(dp_idx);
1371 case ODP_VPORT_ATTACH:
1372 err = attach_port(dp_idx, (struct odp_port __user *)argp);
1375 case ODP_VPORT_DETACH:
1376 err = get_user(port_no, (int __user *)argp);
1378 err = detach_port(dp_idx, port_no);
1382 err = vport_user_mod((struct odp_port __user *)argp);
1385 case ODP_VPORT_STATS_GET:
1386 err = vport_user_stats_get((struct odp_vport_stats_req __user *)argp);
1389 case ODP_VPORT_STATS_SET:
1390 err = vport_user_stats_set((struct odp_vport_stats_req __user *)argp);
1393 case ODP_VPORT_ETHER_GET:
1394 err = vport_user_ether_get((struct odp_vport_ether __user *)argp);
1397 case ODP_VPORT_ETHER_SET:
1398 err = vport_user_ether_set((struct odp_vport_ether __user *)argp);
1401 case ODP_VPORT_MTU_GET:
1402 err = vport_user_mtu_get((struct odp_vport_mtu __user *)argp);
1405 case ODP_VPORT_MTU_SET:
1406 err = vport_user_mtu_set((struct odp_vport_mtu __user *)argp);
1410 dp = get_dp_locked(dp_idx);
1417 err = get_dp_stats(dp, (struct odp_stats __user *)argp);
1420 case ODP_GET_DROP_FRAGS:
1421 err = put_user(dp->drop_frags, (int __user *)argp);
1424 case ODP_SET_DROP_FRAGS:
1425 err = get_user(drop_frags, (int __user *)argp);
1429 if (drop_frags != 0 && drop_frags != 1)
1431 dp->drop_frags = drop_frags;
1435 case ODP_GET_LISTEN_MASK:
1436 err = put_user(get_listen_mask(f), (int __user *)argp);
1439 case ODP_SET_LISTEN_MASK:
1440 err = get_user(listeners, (int __user *)argp);
1444 if (listeners & ~ODPL_ALL)
1447 set_listen_mask(f, listeners);
1450 case ODP_GET_SFLOW_PROBABILITY:
1451 err = put_user(dp->sflow_probability, (unsigned int __user *)argp);
1454 case ODP_SET_SFLOW_PROBABILITY:
1455 err = get_user(sflow_probability, (unsigned int __user *)argp);
1457 dp->sflow_probability = sflow_probability;
1460 case ODP_VPORT_QUERY:
1461 err = query_port(dp, (struct odp_port __user *)argp);
1464 case ODP_VPORT_LIST:
1465 err = list_ports(dp, (struct odp_portvec __user *)argp);
1468 case ODP_FLOW_FLUSH:
1469 err = flush_flows(dp);
1473 err = put_flow(dp, (struct odp_flow_put __user *)argp);
1477 err = del_flow(dp, (struct odp_flow __user *)argp);
1481 err = do_flowvec_ioctl(dp, argp, do_query_flows);
1485 err = do_flowvec_ioctl(dp, argp, do_list_flows);
1489 err = execute_packet(dp, (struct odp_execute __user *)argp);
1496 mutex_unlock(&dp->mutex);
1501 static int dp_has_packet_of_interest(struct datapath *dp, int listeners)
1504 for (i = 0; i < DP_N_QUEUES; i++) {
1505 if (listeners & (1 << i) && !skb_queue_empty(&dp->queues[i]))
1511 #ifdef CONFIG_COMPAT
1512 static int compat_list_ports(struct datapath *dp, struct compat_odp_portvec __user *upv)
1514 struct compat_odp_portvec pv;
1517 if (copy_from_user(&pv, upv, sizeof pv))
1520 retval = do_list_ports(dp, compat_ptr(pv.ports), pv.n_ports);
1524 return put_user(retval, &upv->n_ports);
1527 static int compat_get_flow(struct odp_flow *flow, const struct compat_odp_flow __user *compat)
1529 compat_uptr_t actions;
1531 if (!access_ok(VERIFY_READ, compat, sizeof(struct compat_odp_flow)) ||
1532 __copy_from_user(&flow->stats, &compat->stats, sizeof(struct odp_flow_stats)) ||
1533 __copy_from_user(&flow->key, &compat->key, sizeof(struct odp_flow_key)) ||
1534 __get_user(actions, &compat->actions) ||
1535 __get_user(flow->actions_len, &compat->actions_len) ||
1536 __get_user(flow->flags, &compat->flags))
1539 flow->actions = (struct nlattr __force *)compat_ptr(actions);
1543 static int compat_put_flow(struct datapath *dp, struct compat_odp_flow_put __user *ufp)
1545 struct odp_flow_stats stats;
1546 struct odp_flow_put fp;
1549 if (compat_get_flow(&fp.flow, &ufp->flow) ||
1550 get_user(fp.flags, &ufp->flags))
1553 error = do_put_flow(dp, &fp, &stats);
1557 if (copy_to_user(&ufp->flow.stats, &stats,
1558 sizeof(struct odp_flow_stats)))
1564 static int compat_answer_query(struct datapath *dp, struct sw_flow *flow,
1566 struct compat_odp_flow __user *ufp)
1568 compat_uptr_t actions;
1570 if (get_user(actions, &ufp->actions))
1573 return do_answer_query(dp, flow, query_flags, &ufp->stats,
1574 compat_ptr(actions), &ufp->actions_len);
1577 static int compat_del_flow(struct datapath *dp, struct compat_odp_flow __user *ufp)
1579 struct sw_flow *flow;
1583 if (compat_get_flow(&uf, ufp))
1586 flow = do_del_flow(dp, &uf.key);
1588 return PTR_ERR(flow);
1590 error = compat_answer_query(dp, flow, 0, ufp);
1591 flow_deferred_free(flow);
1595 static int compat_query_flows(struct datapath *dp,
1596 struct compat_odp_flow __user *flows,
1599 struct tbl *table = get_table_protected(dp);
1602 for (i = 0; i < n_flows; i++) {
1603 struct compat_odp_flow __user *ufp = &flows[i];
1605 struct tbl_node *flow_node;
1608 if (compat_get_flow(&uf, ufp))
1611 flow_node = tbl_lookup(table, &uf.key, flow_hash(&uf.key), flow_cmp);
1613 error = put_user(ENOENT, &ufp->stats.error);
1615 error = compat_answer_query(dp, flow_cast(flow_node),
1623 struct compat_list_flows_cbdata {
1624 struct datapath *dp;
1625 struct compat_odp_flow __user *uflows;
1630 static int compat_list_flow(struct tbl_node *node, void *cbdata_)
1632 struct sw_flow *flow = flow_cast(node);
1633 struct compat_list_flows_cbdata *cbdata = cbdata_;
1634 struct compat_odp_flow __user *ufp = &cbdata->uflows[cbdata->listed_flows++];
1637 if (copy_to_user(&ufp->key, &flow->key, sizeof flow->key))
1639 error = compat_answer_query(cbdata->dp, flow, 0, ufp);
1643 if (cbdata->listed_flows >= cbdata->n_flows)
1644 return cbdata->listed_flows;
1648 static int compat_list_flows(struct datapath *dp,
1649 struct compat_odp_flow __user *flows, u32 n_flows)
1651 struct compat_list_flows_cbdata cbdata;
1658 cbdata.uflows = flows;
1659 cbdata.n_flows = n_flows;
1660 cbdata.listed_flows = 0;
1662 error = tbl_foreach(get_table_protected(dp), compat_list_flow, &cbdata);
1663 return error ? error : cbdata.listed_flows;
1666 static int compat_flowvec_ioctl(struct datapath *dp, unsigned long argp,
1667 int (*function)(struct datapath *,
1668 struct compat_odp_flow __user *,
1671 struct compat_odp_flowvec __user *uflowvec;
1672 struct compat_odp_flow __user *flows;
1673 struct compat_odp_flowvec flowvec;
1676 uflowvec = compat_ptr(argp);
1677 if (!access_ok(VERIFY_WRITE, uflowvec, sizeof *uflowvec) ||
1678 copy_from_user(&flowvec, uflowvec, sizeof flowvec))
1681 if (flowvec.n_flows > INT_MAX / sizeof(struct compat_odp_flow))
1684 flows = compat_ptr(flowvec.flows);
1685 if (!access_ok(VERIFY_WRITE, flows,
1686 flowvec.n_flows * sizeof(struct compat_odp_flow)))
1689 retval = function(dp, flows, flowvec.n_flows);
1690 return (retval < 0 ? retval
1691 : retval == flowvec.n_flows ? 0
1692 : put_user(retval, &uflowvec->n_flows));
1695 static int compat_execute(struct datapath *dp, const struct compat_odp_execute __user *uexecute)
1697 struct odp_execute execute;
1698 compat_uptr_t actions;
1701 if (!access_ok(VERIFY_READ, uexecute, sizeof(struct compat_odp_execute)) ||
1702 __get_user(actions, &uexecute->actions) ||
1703 __get_user(execute.actions_len, &uexecute->actions_len) ||
1704 __get_user(data, &uexecute->data) ||
1705 __get_user(execute.length, &uexecute->length))
1708 execute.actions = (struct nlattr __force *)compat_ptr(actions);
1709 execute.data = (const void __force *)compat_ptr(data);
1711 return do_execute(dp, &execute);
1714 static long openvswitch_compat_ioctl(struct file *f, unsigned int cmd, unsigned long argp)
1716 int dp_idx = iminor(f->f_dentry->d_inode);
1717 struct datapath *dp;
1721 case ODP_DP_DESTROY:
1722 case ODP_FLOW_FLUSH:
1723 /* Ioctls that don't need any translation at all. */
1724 return openvswitch_ioctl(f, cmd, argp);
1727 case ODP_VPORT_ATTACH:
1728 case ODP_VPORT_DETACH:
1730 case ODP_VPORT_MTU_SET:
1731 case ODP_VPORT_MTU_GET:
1732 case ODP_VPORT_ETHER_SET:
1733 case ODP_VPORT_ETHER_GET:
1734 case ODP_VPORT_STATS_SET:
1735 case ODP_VPORT_STATS_GET:
1737 case ODP_GET_DROP_FRAGS:
1738 case ODP_SET_DROP_FRAGS:
1739 case ODP_SET_LISTEN_MASK:
1740 case ODP_GET_LISTEN_MASK:
1741 case ODP_SET_SFLOW_PROBABILITY:
1742 case ODP_GET_SFLOW_PROBABILITY:
1743 case ODP_VPORT_QUERY:
1744 /* Ioctls that just need their pointer argument extended. */
1745 return openvswitch_ioctl(f, cmd, (unsigned long)compat_ptr(argp));
1748 dp = get_dp_locked(dp_idx);
1754 case ODP_VPORT_LIST32:
1755 err = compat_list_ports(dp, compat_ptr(argp));
1758 case ODP_FLOW_PUT32:
1759 err = compat_put_flow(dp, compat_ptr(argp));
1762 case ODP_FLOW_DEL32:
1763 err = compat_del_flow(dp, compat_ptr(argp));
1766 case ODP_FLOW_GET32:
1767 err = compat_flowvec_ioctl(dp, argp, compat_query_flows);
1770 case ODP_FLOW_LIST32:
1771 err = compat_flowvec_ioctl(dp, argp, compat_list_flows);
1775 err = compat_execute(dp, compat_ptr(argp));
1782 mutex_unlock(&dp->mutex);
1788 /* Unfortunately this function is not exported so this is a verbatim copy
1789 * from net/core/datagram.c in 2.6.30. */
1790 static int skb_copy_and_csum_datagram(const struct sk_buff *skb, int offset,
1791 u8 __user *to, int len,
1794 int start = skb_headlen(skb);
1796 int i, copy = start - offset;
1803 *csump = csum_and_copy_to_user(skb->data + offset, to, copy,
1807 if ((len -= copy) == 0)
1814 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1817 WARN_ON(start > offset + len);
1819 end = start + skb_shinfo(skb)->frags[i].size;
1820 if ((copy = end - offset) > 0) {
1824 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
1825 struct page *page = frag->page;
1830 csum2 = csum_and_copy_to_user(vaddr +
1837 *csump = csum_block_add(*csump, csum2, pos);
1847 if (skb_shinfo(skb)->frag_list) {
1848 struct sk_buff *list = skb_shinfo(skb)->frag_list;
1850 for (; list; list=list->next) {
1853 WARN_ON(start > offset + len);
1855 end = start + list->len;
1856 if ((copy = end - offset) > 0) {
1860 if (skb_copy_and_csum_datagram(list,
1865 *csump = csum_block_add(*csump, csum2, pos);
1866 if ((len -= copy) == 0)
1882 static ssize_t openvswitch_read(struct file *f, char __user *buf,
1883 size_t nbytes, loff_t *ppos)
1885 int listeners = get_listen_mask(f);
1886 int dp_idx = iminor(f->f_dentry->d_inode);
1887 struct datapath *dp = get_dp_locked(dp_idx);
1888 struct sk_buff *skb;
1889 size_t copy_bytes, tot_copy_bytes;
1895 if (nbytes == 0 || !listeners)
1901 for (i = 0; i < DP_N_QUEUES; i++) {
1902 if (listeners & (1 << i)) {
1903 skb = skb_dequeue(&dp->queues[i]);
1909 if (f->f_flags & O_NONBLOCK) {
1914 wait_event_interruptible(dp->waitqueue,
1915 dp_has_packet_of_interest(dp,
1918 if (signal_pending(current)) {
1919 retval = -ERESTARTSYS;
1924 mutex_unlock(&dp->mutex);
1926 copy_bytes = tot_copy_bytes = min_t(size_t, skb->len, nbytes);
1929 if (skb->ip_summed == CHECKSUM_PARTIAL) {
1930 if (copy_bytes == skb->len) {
1932 u16 csum_start, csum_offset;
1934 get_skb_csum_pointers(skb, &csum_start, &csum_offset);
1935 csum_start -= skb_headroom(skb);
1937 BUG_ON(csum_start >= skb_headlen(skb));
1938 retval = skb_copy_and_csum_datagram(skb, csum_start, buf + csum_start,
1939 copy_bytes - csum_start, &csum);
1941 __sum16 __user *csump;
1943 copy_bytes = csum_start;
1944 csump = (__sum16 __user *)(buf + csum_start + csum_offset);
1946 BUG_ON((char __user *)csump + sizeof(__sum16) >
1948 put_user(csum_fold(csum), csump);
1951 retval = skb_checksum_help(skb);
1958 iov.iov_len = copy_bytes;
1959 retval = skb_copy_datagram_iovec(skb, 0, &iov, iov.iov_len);
1963 retval = tot_copy_bytes;
1969 mutex_unlock(&dp->mutex);
1973 static unsigned int openvswitch_poll(struct file *file, poll_table *wait)
1975 int dp_idx = iminor(file->f_dentry->d_inode);
1976 struct datapath *dp = get_dp_locked(dp_idx);
1981 poll_wait(file, &dp->waitqueue, wait);
1982 if (dp_has_packet_of_interest(dp, get_listen_mask(file)))
1983 mask |= POLLIN | POLLRDNORM;
1984 mutex_unlock(&dp->mutex);
1986 mask = POLLIN | POLLRDNORM | POLLHUP;
1991 static struct file_operations openvswitch_fops = {
1992 .read = openvswitch_read,
1993 .poll = openvswitch_poll,
1994 .unlocked_ioctl = openvswitch_ioctl,
1995 #ifdef CONFIG_COMPAT
1996 .compat_ioctl = openvswitch_compat_ioctl,
2002 static int __init dp_init(void)
2004 struct sk_buff *dummy_skb;
2007 BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > sizeof(dummy_skb->cb));
2009 printk("Open vSwitch %s, built "__DATE__" "__TIME__"\n", VERSION BUILDNR);
2017 goto error_flow_exit;
2019 err = register_netdevice_notifier(&dp_device_notifier);
2021 goto error_vport_exit;
2023 major = register_chrdev(0, "openvswitch", &openvswitch_fops);
2025 goto error_unreg_notifier;
2029 error_unreg_notifier:
2030 unregister_netdevice_notifier(&dp_device_notifier);
2039 static void dp_cleanup(void)
2042 unregister_chrdev(major, "openvswitch");
2043 unregister_netdevice_notifier(&dp_device_notifier);
2048 module_init(dp_init);
2049 module_exit(dp_cleanup);
2051 MODULE_DESCRIPTION("Open vSwitch switching datapath");
2052 MODULE_LICENSE("GPL");