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);
251 mutex_lock(&dp->mutex);
253 for (i = 0; i < DP_N_QUEUES; i++)
254 skb_queue_head_init(&dp->queues[i]);
255 init_waitqueue_head(&dp->waitqueue);
257 /* Initialize kobject for bridge. This will be added as
258 * /sys/class/net/<devname>/brif later, if sysfs is enabled. */
259 dp->ifobj.kset = NULL;
260 kobject_init(&dp->ifobj, &dp_ktype);
262 /* Allocate table. */
264 rcu_assign_pointer(dp->table, tbl_create(TBL_MIN_BUCKETS));
268 /* Set up our datapath device. */
269 BUILD_BUG_ON(sizeof(internal_dev_port.devname) != sizeof(devname));
270 strcpy(internal_dev_port.devname, devname);
271 strcpy(internal_dev_port.type, "internal");
272 err = new_vport(dp, &internal_dev_port, ODPP_LOCAL);
277 goto err_destroy_table;
281 dp->stats_percpu = alloc_percpu(struct dp_stats_percpu);
282 if (!dp->stats_percpu) {
284 goto err_destroy_local_port;
287 rcu_assign_pointer(dps[dp_idx], dp);
290 mutex_unlock(&dp->mutex);
291 mutex_unlock(&dp_mutex);
296 err_destroy_local_port:
297 dp_detach_port(get_vport_protected(dp, ODPP_LOCAL));
299 tbl_destroy(get_table_protected(dp), NULL);
301 mutex_unlock(&dp->mutex);
304 module_put(THIS_MODULE);
306 mutex_unlock(&dp_mutex);
312 static int destroy_dp(int dp_idx)
320 mutex_lock(&dp_mutex);
327 mutex_lock(&dp->mutex);
329 list_for_each_entry_safe (p, n, &dp->port_list, node)
330 if (p->port_no != ODPP_LOCAL)
335 rcu_assign_pointer(dps[dp->dp_idx], NULL);
337 dp_detach_port(get_vport_protected(dp, ODPP_LOCAL));
338 tbl_destroy(get_table_protected(dp), flow_free_tbl);
340 for (i = 0; i < DP_N_QUEUES; i++)
341 skb_queue_purge(&dp->queues[i]);
342 free_percpu(dp->stats_percpu);
344 mutex_unlock(&dp->mutex);
345 kobject_put(&dp->ifobj);
346 module_put(THIS_MODULE);
349 mutex_unlock(&dp_mutex);
354 /* Called with RTNL lock and dp->mutex. */
355 static int new_vport(struct datapath *dp, struct odp_port *odp_port, int port_no)
357 struct vport_parms parms;
360 parms.name = odp_port->devname;
361 parms.type = odp_port->type;
362 parms.config = odp_port->config;
364 parms.port_no = port_no;
367 vport = vport_add(&parms);
371 return PTR_ERR(vport);
373 rcu_assign_pointer(dp->ports[port_no], vport);
374 list_add_rcu(&vport->node, &dp->port_list);
377 dp_ifinfo_notify(RTM_NEWLINK, vport);
382 static int attach_port(int dp_idx, struct odp_port __user *portp)
385 struct odp_port port;
390 if (copy_from_user(&port, portp, sizeof port))
392 port.devname[IFNAMSIZ - 1] = '\0';
393 port.type[VPORT_TYPE_SIZE - 1] = '\0';
396 dp = get_dp_locked(dp_idx);
399 goto out_unlock_rtnl;
401 for (port_no = 1; port_no < DP_MAX_PORTS; port_no++)
402 if (!dp->ports[port_no])
408 err = new_vport(dp, &port, port_no);
412 set_internal_devs_mtu(dp);
413 dp_sysfs_add_if(get_vport_protected(dp, port_no));
415 err = put_user(port_no, &portp->port);
418 mutex_unlock(&dp->mutex);
425 int dp_detach_port(struct vport *p)
431 if (p->port_no != ODPP_LOCAL)
433 dp_ifinfo_notify(RTM_DELLINK, p);
435 /* First drop references to device. */
437 list_del_rcu(&p->node);
438 rcu_assign_pointer(p->dp->ports[p->port_no], NULL);
440 /* Then destroy it. */
448 static int detach_port(int dp_idx, int port_no)
455 if (port_no < 0 || port_no >= DP_MAX_PORTS || port_no == ODPP_LOCAL)
459 dp = get_dp_locked(dp_idx);
462 goto out_unlock_rtnl;
464 p = get_vport_protected(dp, port_no);
469 err = dp_detach_port(p);
472 mutex_unlock(&dp->mutex);
479 /* Must be called with rcu_read_lock. */
480 void dp_process_received_packet(struct vport *p, struct sk_buff *skb)
482 struct datapath *dp = p->dp;
483 struct dp_stats_percpu *stats;
484 int stats_counter_off;
485 struct sw_flow_actions *acts;
486 struct loop_counter *loop;
489 OVS_CB(skb)->vport = p;
491 if (!OVS_CB(skb)->flow) {
492 struct odp_flow_key key;
493 struct tbl_node *flow_node;
496 /* Extract flow from 'skb' into 'key'. */
497 error = flow_extract(skb, p ? p->port_no : ODPP_NONE, &key, &is_frag);
498 if (unlikely(error)) {
503 if (is_frag && dp->drop_frags) {
505 stats_counter_off = offsetof(struct dp_stats_percpu, n_frags);
510 flow_node = tbl_lookup(rcu_dereference(dp->table), &key,
511 flow_hash(&key), flow_cmp);
512 if (unlikely(!flow_node)) {
513 dp_output_control(dp, skb, _ODPL_MISS_NR,
514 (__force u64)OVS_CB(skb)->tun_id);
515 stats_counter_off = offsetof(struct dp_stats_percpu, n_missed);
519 OVS_CB(skb)->flow = flow_cast(flow_node);
522 stats_counter_off = offsetof(struct dp_stats_percpu, n_hit);
523 flow_used(OVS_CB(skb)->flow, skb);
525 acts = rcu_dereference(OVS_CB(skb)->flow->sf_acts);
527 /* Check whether we've looped too much. */
528 loop = loop_get_counter();
529 if (unlikely(++loop->count > MAX_LOOPS))
530 loop->looping = true;
531 if (unlikely(loop->looping)) {
532 loop_suppress(dp, acts);
537 /* Execute actions. */
538 execute_actions(dp, skb, &OVS_CB(skb)->flow->key, acts->actions,
541 /* Check whether sub-actions looped too much. */
542 if (unlikely(loop->looping))
543 loop_suppress(dp, acts);
546 /* Decrement loop counter. */
548 loop->looping = false;
552 /* Update datapath statistics. */
554 stats = per_cpu_ptr(dp->stats_percpu, smp_processor_id());
556 write_seqcount_begin(&stats->seqlock);
557 (*(u64 *)((u8 *)stats + stats_counter_off))++;
558 write_seqcount_end(&stats->seqlock);
563 /* Append each packet in 'skb' list to 'queue'. There will be only one packet
564 * unless we broke up a GSO packet. */
565 static int queue_control_packets(struct sk_buff *skb, struct sk_buff_head *queue,
566 int queue_no, u64 arg)
568 struct sk_buff *nskb;
572 if (OVS_CB(skb)->vport)
573 port_no = OVS_CB(skb)->vport->port_no;
575 port_no = ODPP_LOCAL;
578 struct odp_msg *header;
583 err = skb_cow(skb, sizeof *header);
587 header = (struct odp_msg*)__skb_push(skb, sizeof *header);
588 header->type = queue_no;
589 header->length = skb->len;
590 header->port = port_no;
592 skb_queue_tail(queue, skb);
600 while ((skb = nskb) != NULL) {
607 int dp_output_control(struct datapath *dp, struct sk_buff *skb, int queue_no,
610 struct dp_stats_percpu *stats;
611 struct sk_buff_head *queue;
614 WARN_ON_ONCE(skb_shared(skb));
615 BUG_ON(queue_no != _ODPL_MISS_NR && queue_no != _ODPL_ACTION_NR && queue_no != _ODPL_SFLOW_NR);
616 queue = &dp->queues[queue_no];
618 if (skb_queue_len(queue) >= DP_MAX_QUEUE_LEN)
621 forward_ip_summed(skb);
623 err = vswitch_skb_checksum_setup(skb);
627 /* Break apart GSO packets into their component pieces. Otherwise
628 * userspace may try to stuff a 64kB packet into a 1500-byte MTU. */
629 if (skb_is_gso(skb)) {
630 struct sk_buff *nskb = skb_gso_segment(skb, NETIF_F_SG | NETIF_F_HW_CSUM);
640 err = queue_control_packets(skb, queue, queue_no, arg);
641 wake_up_interruptible(&dp->waitqueue);
648 stats = per_cpu_ptr(dp->stats_percpu, smp_processor_id());
650 write_seqcount_begin(&stats->seqlock);
652 write_seqcount_end(&stats->seqlock);
659 static int flush_flows(struct datapath *dp)
661 struct tbl *old_table = get_table_protected(dp);
662 struct tbl *new_table;
664 new_table = tbl_create(TBL_MIN_BUCKETS);
668 rcu_assign_pointer(dp->table, new_table);
670 tbl_deferred_destroy(old_table, flow_free_tbl);
675 static int validate_actions(const struct nlattr *actions, u32 actions_len)
677 const struct nlattr *a;
680 nla_for_each_attr(a, actions, actions_len, rem) {
681 static const u32 action_lens[ODPAT_MAX + 1] = {
683 [ODPAT_CONTROLLER] = 8,
684 [ODPAT_SET_DL_TCI] = 2,
685 [ODPAT_STRIP_VLAN] = 0,
686 [ODPAT_SET_DL_SRC] = ETH_ALEN,
687 [ODPAT_SET_DL_DST] = ETH_ALEN,
688 [ODPAT_SET_NW_SRC] = 4,
689 [ODPAT_SET_NW_DST] = 4,
690 [ODPAT_SET_NW_TOS] = 1,
691 [ODPAT_SET_TP_SRC] = 2,
692 [ODPAT_SET_TP_DST] = 2,
693 [ODPAT_SET_TUNNEL] = 8,
694 [ODPAT_SET_PRIORITY] = 4,
695 [ODPAT_POP_PRIORITY] = 0,
696 [ODPAT_DROP_SPOOFED_ARP] = 0,
698 int type = nla_type(a);
700 if (type > ODPAT_MAX || nla_len(a) != action_lens[type])
707 case ODPAT_CONTROLLER:
708 case ODPAT_STRIP_VLAN:
709 case ODPAT_SET_DL_SRC:
710 case ODPAT_SET_DL_DST:
711 case ODPAT_SET_NW_SRC:
712 case ODPAT_SET_NW_DST:
713 case ODPAT_SET_TP_SRC:
714 case ODPAT_SET_TP_DST:
715 case ODPAT_SET_TUNNEL:
716 case ODPAT_SET_PRIORITY:
717 case ODPAT_POP_PRIORITY:
718 case ODPAT_DROP_SPOOFED_ARP:
719 /* No validation needed. */
723 if (nla_get_u32(a) >= DP_MAX_PORTS)
726 case ODPAT_SET_DL_TCI:
727 if (nla_get_be16(a) & htons(VLAN_CFI_MASK))
731 case ODPAT_SET_NW_TOS:
732 if (nla_get_u8(a) & INET_ECN_MASK)
747 static struct sw_flow_actions *get_actions(const struct odp_flow *flow)
749 struct sw_flow_actions *actions;
752 actions = flow_actions_alloc(flow->actions_len);
753 error = PTR_ERR(actions);
758 if (copy_from_user(actions->actions,
759 (struct nlattr __user __force *)flow->actions,
761 goto error_free_actions;
762 error = validate_actions(actions->actions, actions->actions_len);
764 goto error_free_actions;
771 return ERR_PTR(error);
774 static void get_stats(struct sw_flow *flow, struct odp_flow_stats *stats)
777 struct timespec offset_ts, used, now_mono;
779 ktime_get_ts(&now_mono);
780 jiffies_to_timespec(jiffies - flow->used, &offset_ts);
781 set_normalized_timespec(&used, now_mono.tv_sec - offset_ts.tv_sec,
782 now_mono.tv_nsec - offset_ts.tv_nsec);
784 stats->used_sec = used.tv_sec;
785 stats->used_nsec = used.tv_nsec;
788 stats->used_nsec = 0;
791 stats->n_packets = flow->packet_count;
792 stats->n_bytes = flow->byte_count;
794 stats->tcp_flags = flow->tcp_flags;
798 static void clear_stats(struct sw_flow *flow)
802 flow->packet_count = 0;
803 flow->byte_count = 0;
806 static int expand_table(struct datapath *dp)
808 struct tbl *old_table = get_table_protected(dp);
809 struct tbl *new_table;
811 new_table = tbl_expand(old_table);
812 if (IS_ERR(new_table))
813 return PTR_ERR(new_table);
815 rcu_assign_pointer(dp->table, new_table);
816 tbl_deferred_destroy(old_table, NULL);
821 static int do_put_flow(struct datapath *dp, struct odp_flow_put *uf,
822 struct odp_flow_stats *stats)
824 struct tbl_node *flow_node;
825 struct sw_flow *flow;
827 struct sw_flow_actions *acts = NULL;
831 hash = flow_hash(&uf->flow.key);
832 table = get_table_protected(dp);
833 flow_node = tbl_lookup(table, &uf->flow.key, hash, flow_cmp);
837 if (!(uf->flags & ODPPF_CREATE))
840 /* Expand table, if necessary, to make room. */
841 if (tbl_count(table) >= tbl_n_buckets(table)) {
842 error = expand_table(dp);
845 table = get_table_protected(dp);
851 error = PTR_ERR(flow);
854 flow->key = uf->flow.key;
857 /* Obtain actions. */
858 acts = get_actions(&uf->flow);
859 error = PTR_ERR(acts);
861 goto error_free_flow;
862 rcu_assign_pointer(flow->sf_acts, acts);
864 /* Put flow in bucket. */
865 error = tbl_insert(table, &flow->tbl_node, hash);
867 goto error_free_flow_acts;
869 memset(stats, 0, sizeof(struct odp_flow_stats));
871 /* We found a matching flow. */
872 struct sw_flow_actions *old_acts, *new_acts;
874 flow = flow_cast(flow_node);
876 /* Bail out if we're not allowed to modify an existing flow. */
878 if (!(uf->flags & ODPPF_MODIFY))
882 new_acts = get_actions(&uf->flow);
883 error = PTR_ERR(new_acts);
884 if (IS_ERR(new_acts))
887 old_acts = rcu_dereference_protected(flow->sf_acts,
888 lockdep_is_held(&dp->mutex));
889 if (old_acts->actions_len != new_acts->actions_len ||
890 memcmp(old_acts->actions, new_acts->actions,
891 old_acts->actions_len)) {
892 rcu_assign_pointer(flow->sf_acts, new_acts);
893 flow_deferred_free_acts(old_acts);
898 /* Fetch stats, then clear them if necessary. */
899 spin_lock_bh(&flow->lock);
900 get_stats(flow, stats);
901 if (uf->flags & ODPPF_ZERO_STATS)
903 spin_unlock_bh(&flow->lock);
908 error_free_flow_acts:
911 flow->sf_acts = NULL;
917 static int put_flow(struct datapath *dp, struct odp_flow_put __user *ufp)
919 struct odp_flow_stats stats;
920 struct odp_flow_put uf;
923 if (copy_from_user(&uf, ufp, sizeof(struct odp_flow_put)))
926 error = do_put_flow(dp, &uf, &stats);
930 if (copy_to_user(&ufp->flow.stats, &stats,
931 sizeof(struct odp_flow_stats)))
937 static int do_answer_query(struct datapath *dp, struct sw_flow *flow,
939 struct odp_flow_stats __user *ustats,
940 struct nlattr __user *actions,
941 u32 __user *actions_lenp)
943 struct sw_flow_actions *sf_acts;
944 struct odp_flow_stats stats;
947 spin_lock_bh(&flow->lock);
948 get_stats(flow, &stats);
949 if (query_flags & ODPFF_ZERO_TCP_FLAGS)
952 spin_unlock_bh(&flow->lock);
954 if (copy_to_user(ustats, &stats, sizeof(struct odp_flow_stats)) ||
955 get_user(actions_len, actions_lenp))
961 sf_acts = rcu_dereference_protected(flow->sf_acts,
962 lockdep_is_held(&dp->mutex));
963 if (put_user(sf_acts->actions_len, actions_lenp) ||
964 (actions && copy_to_user(actions, sf_acts->actions,
965 min(sf_acts->actions_len, actions_len))))
971 static int answer_query(struct datapath *dp, struct sw_flow *flow,
972 u32 query_flags, struct odp_flow __user *ufp)
974 struct nlattr __user *actions;
976 if (get_user(actions, (struct nlattr __user * __user *)&ufp->actions))
979 return do_answer_query(dp, flow, query_flags,
980 &ufp->stats, actions, &ufp->actions_len);
983 static struct sw_flow *do_del_flow(struct datapath *dp, struct odp_flow_key *key)
985 struct tbl *table = get_table_protected(dp);
986 struct tbl_node *flow_node;
989 flow_node = tbl_lookup(table, key, flow_hash(key), flow_cmp);
991 return ERR_PTR(-ENOENT);
993 error = tbl_remove(table, flow_node);
995 return ERR_PTR(error);
997 /* XXX Returned flow_node's statistics might lose a few packets, since
998 * other CPUs can be using this flow. We used to synchronize_rcu() to
999 * make sure that we get completely accurate stats, but that blows our
1000 * performance, badly. */
1001 return flow_cast(flow_node);
1004 static int del_flow(struct datapath *dp, struct odp_flow __user *ufp)
1006 struct sw_flow *flow;
1010 if (copy_from_user(&uf, ufp, sizeof uf))
1013 flow = do_del_flow(dp, &uf.key);
1015 return PTR_ERR(flow);
1017 error = answer_query(dp, flow, 0, ufp);
1018 flow_deferred_free(flow);
1022 static int do_query_flows(struct datapath *dp, const struct odp_flowvec *flowvec)
1024 struct tbl *table = get_table_protected(dp);
1027 for (i = 0; i < flowvec->n_flows; i++) {
1028 struct odp_flow __user *ufp = (struct odp_flow __user __force *)&flowvec->flows[i];
1030 struct tbl_node *flow_node;
1033 if (copy_from_user(&uf, ufp, sizeof uf))
1036 flow_node = tbl_lookup(table, &uf.key, flow_hash(&uf.key), flow_cmp);
1038 error = put_user(ENOENT, &ufp->stats.error);
1040 error = answer_query(dp, flow_cast(flow_node), uf.flags, ufp);
1044 return flowvec->n_flows;
1047 struct list_flows_cbdata {
1048 struct datapath *dp;
1049 struct odp_flow __user *uflows;
1054 static int list_flow(struct tbl_node *node, void *cbdata_)
1056 struct sw_flow *flow = flow_cast(node);
1057 struct list_flows_cbdata *cbdata = cbdata_;
1058 struct odp_flow __user *ufp = &cbdata->uflows[cbdata->listed_flows++];
1061 if (copy_to_user(&ufp->key, &flow->key, sizeof flow->key))
1063 error = answer_query(cbdata->dp, flow, 0, ufp);
1067 if (cbdata->listed_flows >= cbdata->n_flows)
1068 return cbdata->listed_flows;
1072 static int do_list_flows(struct datapath *dp, const struct odp_flowvec *flowvec)
1074 struct list_flows_cbdata cbdata;
1077 if (!flowvec->n_flows)
1081 cbdata.uflows = (struct odp_flow __user __force*)flowvec->flows;
1082 cbdata.n_flows = flowvec->n_flows;
1083 cbdata.listed_flows = 0;
1085 error = tbl_foreach(get_table_protected(dp), list_flow, &cbdata);
1086 return error ? error : cbdata.listed_flows;
1089 static int do_flowvec_ioctl(struct datapath *dp, unsigned long argp,
1090 int (*function)(struct datapath *,
1091 const struct odp_flowvec *))
1093 struct odp_flowvec __user *uflowvec;
1094 struct odp_flowvec flowvec;
1097 uflowvec = (struct odp_flowvec __user *)argp;
1098 if (copy_from_user(&flowvec, uflowvec, sizeof flowvec))
1101 if (flowvec.n_flows > INT_MAX / sizeof(struct odp_flow))
1104 retval = function(dp, &flowvec);
1105 return (retval < 0 ? retval
1106 : retval == flowvec.n_flows ? 0
1107 : put_user(retval, &uflowvec->n_flows));
1110 static int do_execute(struct datapath *dp, const struct odp_execute *execute)
1112 struct odp_flow_key key;
1113 struct sk_buff *skb;
1114 struct sw_flow_actions *actions;
1120 if (execute->length < ETH_HLEN || execute->length > 65535)
1123 actions = flow_actions_alloc(execute->actions_len);
1124 if (IS_ERR(actions)) {
1125 err = PTR_ERR(actions);
1130 if (copy_from_user(actions->actions,
1131 (struct nlattr __user __force *)execute->actions, execute->actions_len))
1132 goto error_free_actions;
1134 err = validate_actions(actions->actions, execute->actions_len);
1136 goto error_free_actions;
1139 skb = alloc_skb(execute->length, GFP_KERNEL);
1141 goto error_free_actions;
1144 if (copy_from_user(skb_put(skb, execute->length),
1145 (const void __user __force *)execute->data,
1147 goto error_free_skb;
1149 skb_reset_mac_header(skb);
1152 /* Normally, setting the skb 'protocol' field would be handled by a
1153 * call to eth_type_trans(), but it assumes there's a sending
1154 * device, which we may not have. */
1155 if (ntohs(eth->h_proto) >= 1536)
1156 skb->protocol = eth->h_proto;
1158 skb->protocol = htons(ETH_P_802_2);
1160 err = flow_extract(skb, -1, &key, &is_frag);
1162 goto error_free_skb;
1165 err = execute_actions(dp, skb, &key, actions->actions, actions->actions_len);
1179 static int execute_packet(struct datapath *dp, const struct odp_execute __user *executep)
1181 struct odp_execute execute;
1183 if (copy_from_user(&execute, executep, sizeof execute))
1186 return do_execute(dp, &execute);
1189 static int get_dp_stats(struct datapath *dp, struct odp_stats __user *statsp)
1191 struct tbl *table = get_table_protected(dp);
1192 struct odp_stats stats;
1195 stats.n_flows = tbl_count(table);
1196 stats.cur_capacity = tbl_n_buckets(table);
1197 stats.max_capacity = TBL_MAX_BUCKETS;
1198 stats.n_ports = dp->n_ports;
1199 stats.max_ports = DP_MAX_PORTS;
1200 stats.n_frags = stats.n_hit = stats.n_missed = stats.n_lost = 0;
1201 for_each_possible_cpu(i) {
1202 const struct dp_stats_percpu *percpu_stats;
1203 struct dp_stats_percpu local_stats;
1206 percpu_stats = per_cpu_ptr(dp->stats_percpu, i);
1209 seqcount = read_seqcount_begin(&percpu_stats->seqlock);
1210 local_stats = *percpu_stats;
1211 } while (read_seqcount_retry(&percpu_stats->seqlock, seqcount));
1213 stats.n_frags += local_stats.n_frags;
1214 stats.n_hit += local_stats.n_hit;
1215 stats.n_missed += local_stats.n_missed;
1216 stats.n_lost += local_stats.n_lost;
1218 stats.max_miss_queue = DP_MAX_QUEUE_LEN;
1219 stats.max_action_queue = DP_MAX_QUEUE_LEN;
1220 return copy_to_user(statsp, &stats, sizeof stats) ? -EFAULT : 0;
1223 /* MTU of the dp pseudo-device: ETH_DATA_LEN or the minimum of the ports */
1224 int dp_min_mtu(const struct datapath *dp)
1231 list_for_each_entry_rcu (p, &dp->port_list, node) {
1234 /* Skip any internal ports, since that's what we're trying to
1236 if (is_internal_vport(p))
1239 dev_mtu = vport_get_mtu(p);
1240 if (!mtu || dev_mtu < mtu)
1244 return mtu ? mtu : ETH_DATA_LEN;
1247 /* Sets the MTU of all datapath devices to the minimum of the ports. Must
1248 * be called with RTNL lock. */
1249 void set_internal_devs_mtu(const struct datapath *dp)
1256 mtu = dp_min_mtu(dp);
1258 list_for_each_entry_rcu (p, &dp->port_list, node) {
1259 if (is_internal_vport(p))
1260 vport_set_mtu(p, mtu);
1264 static int put_port(const struct vport *p, struct odp_port __user *uop)
1268 memset(&op, 0, sizeof op);
1271 strncpy(op.devname, vport_get_name(p), sizeof op.devname);
1272 strncpy(op.type, vport_get_type(p), sizeof op.type);
1273 vport_get_config(p, op.config);
1276 op.port = p->port_no;
1278 return copy_to_user(uop, &op, sizeof op) ? -EFAULT : 0;
1281 static int query_port(struct datapath *dp, struct odp_port __user *uport)
1283 struct odp_port port;
1284 struct vport *vport;
1286 if (copy_from_user(&port, uport, sizeof port))
1289 if (port.devname[0]) {
1290 port.devname[IFNAMSIZ - 1] = '\0';
1293 vport = vport_locate(port.devname);
1298 if (vport->dp != dp)
1301 if (port.port >= DP_MAX_PORTS)
1304 vport = get_vport_protected(dp, port.port);
1309 return put_port(vport, uport);
1312 static int do_list_ports(struct datapath *dp, struct odp_port __user *uports,
1319 list_for_each_entry_rcu (p, &dp->port_list, node) {
1320 if (put_port(p, &uports[idx]))
1322 if (idx++ >= n_ports)
1329 static int list_ports(struct datapath *dp, struct odp_portvec __user *upv)
1331 struct odp_portvec pv;
1334 if (copy_from_user(&pv, upv, sizeof pv))
1337 retval = do_list_ports(dp, (struct odp_port __user __force *)pv.ports,
1342 return put_user(retval, &upv->n_ports);
1345 static int get_listen_mask(const struct file *f)
1347 return (long)f->private_data;
1350 static void set_listen_mask(struct file *f, int listen_mask)
1352 f->private_data = (void*)(long)listen_mask;
1355 static long openvswitch_ioctl(struct file *f, unsigned int cmd,
1358 int dp_idx = iminor(f->f_dentry->d_inode);
1359 struct datapath *dp;
1360 int drop_frags, listeners, port_no;
1361 unsigned int sflow_probability;
1364 /* Handle commands with special locking requirements up front. */
1367 err = create_dp(dp_idx, (char __user *)argp);
1370 case ODP_DP_DESTROY:
1371 err = destroy_dp(dp_idx);
1374 case ODP_VPORT_ATTACH:
1375 err = attach_port(dp_idx, (struct odp_port __user *)argp);
1378 case ODP_VPORT_DETACH:
1379 err = get_user(port_no, (int __user *)argp);
1381 err = detach_port(dp_idx, port_no);
1385 err = vport_user_mod((struct odp_port __user *)argp);
1388 case ODP_VPORT_STATS_GET:
1389 err = vport_user_stats_get((struct odp_vport_stats_req __user *)argp);
1392 case ODP_VPORT_STATS_SET:
1393 err = vport_user_stats_set((struct odp_vport_stats_req __user *)argp);
1396 case ODP_VPORT_ETHER_GET:
1397 err = vport_user_ether_get((struct odp_vport_ether __user *)argp);
1400 case ODP_VPORT_ETHER_SET:
1401 err = vport_user_ether_set((struct odp_vport_ether __user *)argp);
1404 case ODP_VPORT_MTU_GET:
1405 err = vport_user_mtu_get((struct odp_vport_mtu __user *)argp);
1408 case ODP_VPORT_MTU_SET:
1409 err = vport_user_mtu_set((struct odp_vport_mtu __user *)argp);
1413 dp = get_dp_locked(dp_idx);
1420 err = get_dp_stats(dp, (struct odp_stats __user *)argp);
1423 case ODP_GET_DROP_FRAGS:
1424 err = put_user(dp->drop_frags, (int __user *)argp);
1427 case ODP_SET_DROP_FRAGS:
1428 err = get_user(drop_frags, (int __user *)argp);
1432 if (drop_frags != 0 && drop_frags != 1)
1434 dp->drop_frags = drop_frags;
1438 case ODP_GET_LISTEN_MASK:
1439 err = put_user(get_listen_mask(f), (int __user *)argp);
1442 case ODP_SET_LISTEN_MASK:
1443 err = get_user(listeners, (int __user *)argp);
1447 if (listeners & ~ODPL_ALL)
1450 set_listen_mask(f, listeners);
1453 case ODP_GET_SFLOW_PROBABILITY:
1454 err = put_user(dp->sflow_probability, (unsigned int __user *)argp);
1457 case ODP_SET_SFLOW_PROBABILITY:
1458 err = get_user(sflow_probability, (unsigned int __user *)argp);
1460 dp->sflow_probability = sflow_probability;
1463 case ODP_VPORT_QUERY:
1464 err = query_port(dp, (struct odp_port __user *)argp);
1467 case ODP_VPORT_LIST:
1468 err = list_ports(dp, (struct odp_portvec __user *)argp);
1471 case ODP_FLOW_FLUSH:
1472 err = flush_flows(dp);
1476 err = put_flow(dp, (struct odp_flow_put __user *)argp);
1480 err = del_flow(dp, (struct odp_flow __user *)argp);
1484 err = do_flowvec_ioctl(dp, argp, do_query_flows);
1488 err = do_flowvec_ioctl(dp, argp, do_list_flows);
1492 err = execute_packet(dp, (struct odp_execute __user *)argp);
1499 mutex_unlock(&dp->mutex);
1504 static int dp_has_packet_of_interest(struct datapath *dp, int listeners)
1507 for (i = 0; i < DP_N_QUEUES; i++) {
1508 if (listeners & (1 << i) && !skb_queue_empty(&dp->queues[i]))
1514 #ifdef CONFIG_COMPAT
1515 static int compat_list_ports(struct datapath *dp, struct compat_odp_portvec __user *upv)
1517 struct compat_odp_portvec pv;
1520 if (copy_from_user(&pv, upv, sizeof pv))
1523 retval = do_list_ports(dp, compat_ptr(pv.ports), pv.n_ports);
1527 return put_user(retval, &upv->n_ports);
1530 static int compat_get_flow(struct odp_flow *flow, const struct compat_odp_flow __user *compat)
1532 compat_uptr_t actions;
1534 if (!access_ok(VERIFY_READ, compat, sizeof(struct compat_odp_flow)) ||
1535 __copy_from_user(&flow->stats, &compat->stats, sizeof(struct odp_flow_stats)) ||
1536 __copy_from_user(&flow->key, &compat->key, sizeof(struct odp_flow_key)) ||
1537 __get_user(actions, &compat->actions) ||
1538 __get_user(flow->actions_len, &compat->actions_len) ||
1539 __get_user(flow->flags, &compat->flags))
1542 flow->actions = (struct nlattr __force *)compat_ptr(actions);
1546 static int compat_put_flow(struct datapath *dp, struct compat_odp_flow_put __user *ufp)
1548 struct odp_flow_stats stats;
1549 struct odp_flow_put fp;
1552 if (compat_get_flow(&fp.flow, &ufp->flow) ||
1553 get_user(fp.flags, &ufp->flags))
1556 error = do_put_flow(dp, &fp, &stats);
1560 if (copy_to_user(&ufp->flow.stats, &stats,
1561 sizeof(struct odp_flow_stats)))
1567 static int compat_answer_query(struct datapath *dp, struct sw_flow *flow,
1569 struct compat_odp_flow __user *ufp)
1571 compat_uptr_t actions;
1573 if (get_user(actions, &ufp->actions))
1576 return do_answer_query(dp, flow, query_flags, &ufp->stats,
1577 compat_ptr(actions), &ufp->actions_len);
1580 static int compat_del_flow(struct datapath *dp, struct compat_odp_flow __user *ufp)
1582 struct sw_flow *flow;
1586 if (compat_get_flow(&uf, ufp))
1589 flow = do_del_flow(dp, &uf.key);
1591 return PTR_ERR(flow);
1593 error = compat_answer_query(dp, flow, 0, ufp);
1594 flow_deferred_free(flow);
1598 static int compat_query_flows(struct datapath *dp,
1599 struct compat_odp_flow __user *flows,
1602 struct tbl *table = get_table_protected(dp);
1605 for (i = 0; i < n_flows; i++) {
1606 struct compat_odp_flow __user *ufp = &flows[i];
1608 struct tbl_node *flow_node;
1611 if (compat_get_flow(&uf, ufp))
1614 flow_node = tbl_lookup(table, &uf.key, flow_hash(&uf.key), flow_cmp);
1616 error = put_user(ENOENT, &ufp->stats.error);
1618 error = compat_answer_query(dp, flow_cast(flow_node),
1626 struct compat_list_flows_cbdata {
1627 struct datapath *dp;
1628 struct compat_odp_flow __user *uflows;
1633 static int compat_list_flow(struct tbl_node *node, void *cbdata_)
1635 struct sw_flow *flow = flow_cast(node);
1636 struct compat_list_flows_cbdata *cbdata = cbdata_;
1637 struct compat_odp_flow __user *ufp = &cbdata->uflows[cbdata->listed_flows++];
1640 if (copy_to_user(&ufp->key, &flow->key, sizeof flow->key))
1642 error = compat_answer_query(cbdata->dp, flow, 0, ufp);
1646 if (cbdata->listed_flows >= cbdata->n_flows)
1647 return cbdata->listed_flows;
1651 static int compat_list_flows(struct datapath *dp,
1652 struct compat_odp_flow __user *flows, u32 n_flows)
1654 struct compat_list_flows_cbdata cbdata;
1661 cbdata.uflows = flows;
1662 cbdata.n_flows = n_flows;
1663 cbdata.listed_flows = 0;
1665 error = tbl_foreach(get_table_protected(dp), compat_list_flow, &cbdata);
1666 return error ? error : cbdata.listed_flows;
1669 static int compat_flowvec_ioctl(struct datapath *dp, unsigned long argp,
1670 int (*function)(struct datapath *,
1671 struct compat_odp_flow __user *,
1674 struct compat_odp_flowvec __user *uflowvec;
1675 struct compat_odp_flow __user *flows;
1676 struct compat_odp_flowvec flowvec;
1679 uflowvec = compat_ptr(argp);
1680 if (!access_ok(VERIFY_WRITE, uflowvec, sizeof *uflowvec) ||
1681 copy_from_user(&flowvec, uflowvec, sizeof flowvec))
1684 if (flowvec.n_flows > INT_MAX / sizeof(struct compat_odp_flow))
1687 flows = compat_ptr(flowvec.flows);
1688 if (!access_ok(VERIFY_WRITE, flows,
1689 flowvec.n_flows * sizeof(struct compat_odp_flow)))
1692 retval = function(dp, flows, flowvec.n_flows);
1693 return (retval < 0 ? retval
1694 : retval == flowvec.n_flows ? 0
1695 : put_user(retval, &uflowvec->n_flows));
1698 static int compat_execute(struct datapath *dp, const struct compat_odp_execute __user *uexecute)
1700 struct odp_execute execute;
1701 compat_uptr_t actions;
1704 if (!access_ok(VERIFY_READ, uexecute, sizeof(struct compat_odp_execute)) ||
1705 __get_user(actions, &uexecute->actions) ||
1706 __get_user(execute.actions_len, &uexecute->actions_len) ||
1707 __get_user(data, &uexecute->data) ||
1708 __get_user(execute.length, &uexecute->length))
1711 execute.actions = (struct nlattr __force *)compat_ptr(actions);
1712 execute.data = (const void __force *)compat_ptr(data);
1714 return do_execute(dp, &execute);
1717 static long openvswitch_compat_ioctl(struct file *f, unsigned int cmd, unsigned long argp)
1719 int dp_idx = iminor(f->f_dentry->d_inode);
1720 struct datapath *dp;
1724 case ODP_DP_DESTROY:
1725 case ODP_FLOW_FLUSH:
1726 /* Ioctls that don't need any translation at all. */
1727 return openvswitch_ioctl(f, cmd, argp);
1730 case ODP_VPORT_ATTACH:
1731 case ODP_VPORT_DETACH:
1733 case ODP_VPORT_MTU_SET:
1734 case ODP_VPORT_MTU_GET:
1735 case ODP_VPORT_ETHER_SET:
1736 case ODP_VPORT_ETHER_GET:
1737 case ODP_VPORT_STATS_SET:
1738 case ODP_VPORT_STATS_GET:
1740 case ODP_GET_DROP_FRAGS:
1741 case ODP_SET_DROP_FRAGS:
1742 case ODP_SET_LISTEN_MASK:
1743 case ODP_GET_LISTEN_MASK:
1744 case ODP_SET_SFLOW_PROBABILITY:
1745 case ODP_GET_SFLOW_PROBABILITY:
1746 case ODP_VPORT_QUERY:
1747 /* Ioctls that just need their pointer argument extended. */
1748 return openvswitch_ioctl(f, cmd, (unsigned long)compat_ptr(argp));
1751 dp = get_dp_locked(dp_idx);
1757 case ODP_VPORT_LIST32:
1758 err = compat_list_ports(dp, compat_ptr(argp));
1761 case ODP_FLOW_PUT32:
1762 err = compat_put_flow(dp, compat_ptr(argp));
1765 case ODP_FLOW_DEL32:
1766 err = compat_del_flow(dp, compat_ptr(argp));
1769 case ODP_FLOW_GET32:
1770 err = compat_flowvec_ioctl(dp, argp, compat_query_flows);
1773 case ODP_FLOW_LIST32:
1774 err = compat_flowvec_ioctl(dp, argp, compat_list_flows);
1778 err = compat_execute(dp, compat_ptr(argp));
1785 mutex_unlock(&dp->mutex);
1791 /* Unfortunately this function is not exported so this is a verbatim copy
1792 * from net/core/datagram.c in 2.6.30. */
1793 static int skb_copy_and_csum_datagram(const struct sk_buff *skb, int offset,
1794 u8 __user *to, int len,
1797 int start = skb_headlen(skb);
1799 int i, copy = start - offset;
1806 *csump = csum_and_copy_to_user(skb->data + offset, to, copy,
1810 if ((len -= copy) == 0)
1817 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1820 WARN_ON(start > offset + len);
1822 end = start + skb_shinfo(skb)->frags[i].size;
1823 if ((copy = end - offset) > 0) {
1827 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
1828 struct page *page = frag->page;
1833 csum2 = csum_and_copy_to_user(vaddr +
1840 *csump = csum_block_add(*csump, csum2, pos);
1850 if (skb_shinfo(skb)->frag_list) {
1851 struct sk_buff *list = skb_shinfo(skb)->frag_list;
1853 for (; list; list=list->next) {
1856 WARN_ON(start > offset + len);
1858 end = start + list->len;
1859 if ((copy = end - offset) > 0) {
1863 if (skb_copy_and_csum_datagram(list,
1868 *csump = csum_block_add(*csump, csum2, pos);
1869 if ((len -= copy) == 0)
1885 static ssize_t openvswitch_read(struct file *f, char __user *buf,
1886 size_t nbytes, loff_t *ppos)
1888 int listeners = get_listen_mask(f);
1889 int dp_idx = iminor(f->f_dentry->d_inode);
1890 struct datapath *dp = get_dp_locked(dp_idx);
1891 struct sk_buff *skb;
1892 size_t copy_bytes, tot_copy_bytes;
1898 if (nbytes == 0 || !listeners)
1904 for (i = 0; i < DP_N_QUEUES; i++) {
1905 if (listeners & (1 << i)) {
1906 skb = skb_dequeue(&dp->queues[i]);
1912 if (f->f_flags & O_NONBLOCK) {
1917 wait_event_interruptible(dp->waitqueue,
1918 dp_has_packet_of_interest(dp,
1921 if (signal_pending(current)) {
1922 retval = -ERESTARTSYS;
1927 mutex_unlock(&dp->mutex);
1929 copy_bytes = tot_copy_bytes = min_t(size_t, skb->len, nbytes);
1932 if (skb->ip_summed == CHECKSUM_PARTIAL) {
1933 if (copy_bytes == skb->len) {
1935 u16 csum_start, csum_offset;
1937 get_skb_csum_pointers(skb, &csum_start, &csum_offset);
1938 csum_start -= skb_headroom(skb);
1940 BUG_ON(csum_start >= skb_headlen(skb));
1941 retval = skb_copy_and_csum_datagram(skb, csum_start, buf + csum_start,
1942 copy_bytes - csum_start, &csum);
1944 __sum16 __user *csump;
1946 copy_bytes = csum_start;
1947 csump = (__sum16 __user *)(buf + csum_start + csum_offset);
1949 BUG_ON((char __user *)csump + sizeof(__sum16) >
1951 put_user(csum_fold(csum), csump);
1954 retval = skb_checksum_help(skb);
1961 iov.iov_len = copy_bytes;
1962 retval = skb_copy_datagram_iovec(skb, 0, &iov, iov.iov_len);
1966 retval = tot_copy_bytes;
1972 mutex_unlock(&dp->mutex);
1976 static unsigned int openvswitch_poll(struct file *file, poll_table *wait)
1978 int dp_idx = iminor(file->f_dentry->d_inode);
1979 struct datapath *dp = get_dp_locked(dp_idx);
1984 poll_wait(file, &dp->waitqueue, wait);
1985 if (dp_has_packet_of_interest(dp, get_listen_mask(file)))
1986 mask |= POLLIN | POLLRDNORM;
1987 mutex_unlock(&dp->mutex);
1989 mask = POLLIN | POLLRDNORM | POLLHUP;
1994 static struct file_operations openvswitch_fops = {
1995 .owner = THIS_MODULE,
1996 .read = openvswitch_read,
1997 .poll = openvswitch_poll,
1998 .unlocked_ioctl = openvswitch_ioctl,
1999 #ifdef CONFIG_COMPAT
2000 .compat_ioctl = openvswitch_compat_ioctl,
2006 static int __init dp_init(void)
2008 struct sk_buff *dummy_skb;
2011 BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > sizeof(dummy_skb->cb));
2013 printk("Open vSwitch %s, built "__DATE__" "__TIME__"\n", VERSION BUILDNR);
2021 goto error_flow_exit;
2023 err = register_netdevice_notifier(&dp_device_notifier);
2025 goto error_vport_exit;
2027 major = register_chrdev(0, "openvswitch", &openvswitch_fops);
2029 goto error_unreg_notifier;
2033 error_unreg_notifier:
2034 unregister_netdevice_notifier(&dp_device_notifier);
2043 static void dp_cleanup(void)
2046 unregister_chrdev(major, "openvswitch");
2047 unregister_netdevice_notifier(&dp_device_notifier);
2052 module_init(dp_init);
2053 module_exit(dp_cleanup);
2055 MODULE_DESCRIPTION("Open vSwitch switching datapath");
2056 MODULE_LICENSE("GPL");