2 * Copyright (c) 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 #include <linux/dcache.h>
10 #include <linux/etherdevice.h>
12 #include <linux/if_vlan.h>
13 #include <linux/kernel.h>
14 #include <linux/list.h>
15 #include <linux/mutex.h>
16 #include <linux/percpu.h>
17 #include <linux/rtnetlink.h>
18 #include <linux/compat.h>
21 #include "vport-internal_dev.h"
23 /* List of statically compiled vport implementations. Don't forget to also
24 * add yours to the list at the bottom of vport.h. */
25 static struct vport_ops *base_vport_ops_list[] = {
32 static const struct vport_ops **vport_ops_list;
33 static int n_vport_types;
35 static struct hlist_head *dev_table;
36 #define VPORT_HASH_BUCKETS 1024
38 /* We limit the number of times that we pass through vport_send() to
39 * avoid blowing out the stack in the event that we have a loop. There is
40 * a separate counter for each CPU for both interrupt and non-interrupt
41 * context in order to keep the limit deterministic for a given packet. */
42 struct percpu_loop_counter {
46 static DEFINE_PER_CPU(struct percpu_loop_counter, vport_loop_counter);
47 #define VPORT_MAX_LOOPS 5
49 /* Both RTNL lock and vport_mutex need to be held when updating dev_table.
51 * If you use vport_locate and then perform some operations, you need to hold
52 * one of these locks if you don't want the vport to be deleted out from under
55 * If you get a reference to a vport through a dp_port, it is protected
56 * by RCU and you need to hold rcu_read_lock instead when reading.
58 * If multiple locks are taken, the hierarchy is:
63 static DEFINE_MUTEX(vport_mutex);
66 * vport_lock - acquire vport lock
68 * Acquire global vport lock. See above comment about locking requirements
69 * and specific function definitions. May sleep.
73 mutex_lock(&vport_mutex);
77 * vport_unlock - release vport lock
79 * Release lock acquired with vport_lock.
81 void vport_unlock(void)
83 mutex_unlock(&vport_mutex);
86 #define ASSERT_VPORT() do { \
87 if (unlikely(!mutex_is_locked(&vport_mutex))) { \
88 printk(KERN_ERR "openvswitch: vport lock not held at %s (%d)\n", \
89 __FILE__, __LINE__); \
95 * vport_init - initialize vport subsystem
97 * Called at module load time to initialize the vport subsystem and any
98 * compiled in vport types.
105 dev_table = kzalloc(VPORT_HASH_BUCKETS * sizeof(struct hlist_head),
112 vport_ops_list = kmalloc(ARRAY_SIZE(base_vport_ops_list) *
113 sizeof(struct vport_ops *), GFP_KERNEL);
114 if (!vport_ops_list) {
116 goto error_dev_table;
119 for (i = 0; i < ARRAY_SIZE(base_vport_ops_list); i++) {
120 struct vport_ops *new_ops = base_vport_ops_list[i];
123 err = new_ops->init();
128 vport_ops_list[n_vport_types++] = new_ops;
129 else if (new_ops->flags & VPORT_F_REQUIRED) {
143 static void vport_del_all(void)
150 for (i = 0; i < VPORT_HASH_BUCKETS; i++) {
151 struct hlist_head *bucket = &dev_table[i];
153 struct hlist_node *node, *next;
155 hlist_for_each_entry_safe(vport, node, next, bucket, hash_node)
164 * vport_exit - shutdown vport subsystem
166 * Called at module exit time to shutdown the vport subsystem and any
167 * initialized vport types.
169 void vport_exit(void)
175 for (i = 0; i < n_vport_types; i++) {
176 if (vport_ops_list[i]->exit)
177 vport_ops_list[i]->exit();
180 kfree(vport_ops_list);
184 static int do_vport_add(struct odp_vport_add *vport_config)
189 vport_config->port_type[VPORT_TYPE_SIZE - 1] = '\0';
190 vport_config->devname[IFNAMSIZ - 1] = '\0';
194 vport = vport_locate(vport_config->devname);
201 vport = vport_add(vport_config->devname, vport_config->port_type,
202 vport_config->config);
206 err = PTR_ERR(vport);
214 * vport_user_add - add vport device (for userspace callers)
216 * @uvport_config: New port configuration.
218 * Creates a new vport with the specified configuration (which is dependent
219 * on device type). This function is for userspace callers and assumes no
222 int vport_user_add(const struct odp_vport_add __user *uvport_config)
224 struct odp_vport_add vport_config;
226 if (copy_from_user(&vport_config, uvport_config, sizeof(struct odp_vport_add)))
229 return do_vport_add(&vport_config);
233 int compat_vport_user_add(struct compat_odp_vport_add *ucompat)
235 struct compat_odp_vport_add compat;
236 struct odp_vport_add vport_config;
238 if (copy_from_user(&compat, ucompat, sizeof(struct compat_odp_vport_add)))
241 memcpy(vport_config.port_type, compat.port_type, VPORT_TYPE_SIZE);
242 memcpy(vport_config.devname, compat.devname, IFNAMSIZ);
243 vport_config.config = compat_ptr(compat.config);
245 return do_vport_add(&vport_config);
249 static int do_vport_mod(struct odp_vport_mod *vport_config)
254 vport_config->devname[IFNAMSIZ - 1] = '\0';
258 vport = vport_locate(vport_config->devname);
265 err = vport_mod(vport, vport_config->config);
274 * vport_user_mod - modify existing vport device (for userspace callers)
276 * @uvport_config: New configuration for vport
278 * Modifies an existing device with the specified configuration (which is
279 * dependent on device type). This function is for userspace callers and
280 * assumes no locks are held.
282 int vport_user_mod(const struct odp_vport_mod __user *uvport_config)
284 struct odp_vport_mod vport_config;
286 if (copy_from_user(&vport_config, uvport_config, sizeof(struct odp_vport_mod)))
289 return do_vport_mod(&vport_config);
293 int compat_vport_user_mod(struct compat_odp_vport_mod *ucompat)
295 struct compat_odp_vport_mod compat;
296 struct odp_vport_mod vport_config;
298 if (copy_from_user(&compat, ucompat, sizeof(struct compat_odp_vport_mod)))
301 memcpy(vport_config.devname, compat.devname, IFNAMSIZ);
302 vport_config.config = compat_ptr(compat.config);
304 return do_vport_mod(&vport_config);
309 * vport_user_del - delete existing vport device (for userspace callers)
311 * @udevname: Name of device to delete
313 * Deletes the specified device. Detaches the device from a datapath first
314 * if it is attached. Deleting the device will fail if it does not exist or it
315 * is the datapath local port. It is also possible to fail for less obvious
316 * reasons, such as lack of memory. This function is for userspace callers and
317 * assumes no locks are held.
319 int vport_user_del(const char __user *udevname)
321 char devname[IFNAMSIZ];
323 struct dp_port *dp_port;
327 retval = strncpy_from_user(devname, udevname, IFNAMSIZ);
330 else if (retval >= IFNAMSIZ)
331 return -ENAMETOOLONG;
335 vport = vport_locate(devname);
341 dp_port = vport_get_dp_port(vport);
343 struct datapath *dp = dp_port->dp;
345 mutex_lock(&dp->mutex);
347 if (!strcmp(dp_name(dp), devname)) {
352 err = dp_detach_port(dp_port, 0);
355 mutex_unlock(&dp->mutex);
362 err = vport_del(vport);
371 * vport_user_stats_get - retrieve device stats (for userspace callers)
373 * @ustats_req: Stats request parameters.
375 * Retrieves transmit, receive, and error stats for the given device. This
376 * function is for userspace callers and assumes no locks are held.
378 int vport_user_stats_get(struct odp_vport_stats_req __user *ustats_req)
380 struct odp_vport_stats_req stats_req;
384 if (copy_from_user(&stats_req, ustats_req, sizeof(struct odp_vport_stats_req)))
387 stats_req.devname[IFNAMSIZ - 1] = '\0';
391 vport = vport_locate(stats_req.devname);
397 err = vport_get_stats(vport, &stats_req.stats);
403 if (copy_to_user(ustats_req, &stats_req, sizeof(struct odp_vport_stats_req)))
410 * vport_user_stats_set - sets offset device stats (for userspace callers)
412 * @ustats_req: Stats set parameters.
414 * Provides a set of transmit, receive, and error stats to be added as an
415 * offset to the collect data when stats are retreived. Some devices may not
416 * support setting the stats, in which case the result will always be
417 * -EOPNOTSUPP. This function is for userspace callers and assumes no locks
420 int vport_user_stats_set(struct odp_vport_stats_req __user *ustats_req)
422 struct odp_vport_stats_req stats_req;
426 if (copy_from_user(&stats_req, ustats_req, sizeof(struct odp_vport_stats_req)))
429 stats_req.devname[IFNAMSIZ - 1] = '\0';
434 vport = vport_locate(stats_req.devname);
440 err = vport_set_stats(vport, &stats_req.stats);
450 * vport_user_ether_get - retrieve device Ethernet address (for userspace callers)
452 * @uvport_ether: Ethernet address request parameters.
454 * Retrieves the Ethernet address of the given device. This function is for
455 * userspace callers and assumes no locks are held.
457 int vport_user_ether_get(struct odp_vport_ether __user *uvport_ether)
459 struct odp_vport_ether vport_ether;
463 if (copy_from_user(&vport_ether, uvport_ether, sizeof(struct odp_vport_ether)))
466 vport_ether.devname[IFNAMSIZ - 1] = '\0';
470 vport = vport_locate(vport_ether.devname);
477 memcpy(vport_ether.ether_addr, vport_get_addr(vport), ETH_ALEN);
484 if (copy_to_user(uvport_ether, &vport_ether, sizeof(struct odp_vport_ether)))
491 * vport_user_ether_set - set device Ethernet address (for userspace callers)
493 * @uvport_ether: Ethernet address request parameters.
495 * Sets the Ethernet address of the given device. Some devices may not support
496 * setting the Ethernet address, in which case the result will always be
497 * -EOPNOTSUPP. This function is for userspace callers and assumes no locks
500 int vport_user_ether_set(struct odp_vport_ether __user *uvport_ether)
502 struct odp_vport_ether vport_ether;
506 if (copy_from_user(&vport_ether, uvport_ether, sizeof(struct odp_vport_ether)))
509 vport_ether.devname[IFNAMSIZ - 1] = '\0';
514 vport = vport_locate(vport_ether.devname);
520 err = vport_set_addr(vport, vport_ether.ether_addr);
529 * vport_user_mtu_get - retrieve device MTU (for userspace callers)
531 * @uvport_mtu: MTU request parameters.
533 * Retrieves the MTU of the given device. This function is for userspace
534 * callers and assumes no locks are held.
536 int vport_user_mtu_get(struct odp_vport_mtu __user *uvport_mtu)
538 struct odp_vport_mtu vport_mtu;
542 if (copy_from_user(&vport_mtu, uvport_mtu, sizeof(struct odp_vport_mtu)))
545 vport_mtu.devname[IFNAMSIZ - 1] = '\0';
549 vport = vport_locate(vport_mtu.devname);
555 vport_mtu.mtu = vport_get_mtu(vport);
561 if (copy_to_user(uvport_mtu, &vport_mtu, sizeof(struct odp_vport_mtu)))
568 * vport_user_mtu_set - set device MTU (for userspace callers)
570 * @uvport_mtu: MTU request parameters.
572 * Sets the MTU of the given device. Some devices may not support setting the
573 * MTU, in which case the result will always be -EOPNOTSUPP. This function is
574 * for userspace callers and assumes no locks are held.
576 int vport_user_mtu_set(struct odp_vport_mtu __user *uvport_mtu)
578 struct odp_vport_mtu vport_mtu;
582 if (copy_from_user(&vport_mtu, uvport_mtu, sizeof(struct odp_vport_mtu)))
585 vport_mtu.devname[IFNAMSIZ - 1] = '\0';
590 vport = vport_locate(vport_mtu.devname);
596 err = vport_set_mtu(vport, vport_mtu.mtu);
604 static struct hlist_head *hash_bucket(const char *name)
606 unsigned int hash = full_name_hash(name, strlen(name));
607 return &dev_table[hash & (VPORT_HASH_BUCKETS - 1)];
611 * vport_locate - find a port that has already been created
613 * @name: name of port to find
615 * Either RTNL or vport lock must be acquired before calling this function
616 * and held while using the found port. See the locking comments at the
619 struct vport *vport_locate(const char *name)
621 struct hlist_head *bucket = hash_bucket(name);
623 struct hlist_node *node;
625 if (unlikely(!mutex_is_locked(&vport_mutex) && !rtnl_is_locked())) {
626 printk(KERN_ERR "openvswitch: neither RTNL nor vport lock held in vport_locate\n");
632 hlist_for_each_entry(vport, node, bucket, hash_node)
633 if (!strcmp(name, vport_get_name(vport)))
643 static void register_vport(struct vport *vport)
645 hlist_add_head(&vport->hash_node, hash_bucket(vport_get_name(vport)));
648 static void unregister_vport(struct vport *vport)
650 hlist_del(&vport->hash_node);
654 * vport_alloc - allocate and initialize new vport
656 * @priv_size: Size of private data area to allocate.
657 * @ops: vport device ops
659 * Allocate and initialize a new vport defined by @ops. The vport will contain
660 * a private data area of size @priv_size that can be accessed using
661 * vport_priv(). vports that are no longer needed should be released with
664 struct vport *vport_alloc(int priv_size, const struct vport_ops *ops)
669 alloc_size = sizeof(struct vport);
671 alloc_size = ALIGN(alloc_size, VPORT_ALIGN);
672 alloc_size += priv_size;
675 vport = kzalloc(alloc_size, GFP_KERNEL);
677 return ERR_PTR(-ENOMEM);
681 if (vport->ops->flags & VPORT_F_GEN_STATS) {
682 vport->percpu_stats = alloc_percpu(struct vport_percpu_stats);
683 if (!vport->percpu_stats)
684 return ERR_PTR(-ENOMEM);
686 spin_lock_init(&vport->stats_lock);
693 * vport_free - uninitialize and free vport
695 * @vport: vport to free
697 * Frees a vport allocated with vport_alloc() when it is no longer needed.
699 void vport_free(struct vport *vport)
701 if (vport->ops->flags & VPORT_F_GEN_STATS)
702 free_percpu(vport->percpu_stats);
708 * vport_add - add vport device (for kernel callers)
710 * @name: Name of new device.
711 * @type: Type of new device (to be matched against types in registered vport
713 * @config: Device type specific configuration. Userspace pointer.
715 * Creates a new vport with the specified configuration (which is dependent
716 * on device type). Both RTNL and vport locks must be held.
718 struct vport *vport_add(const char *name, const char *type, const void __user *config)
727 for (i = 0; i < n_vport_types; i++) {
728 if (!strcmp(vport_ops_list[i]->type, type)) {
729 vport = vport_ops_list[i]->create(name, config);
731 err = PTR_ERR(vport);
735 register_vport(vport);
747 * vport_mod - modify existing vport device (for kernel callers)
749 * @vport: vport to modify.
750 * @config: Device type specific configuration. Userspace pointer.
752 * Modifies an existing device with the specified configuration (which is
753 * dependent on device type). Both RTNL and vport locks must be held.
755 int vport_mod(struct vport *vport, const void __user *config)
760 if (vport->ops->modify)
761 return vport->ops->modify(vport, config);
767 * vport_del - delete existing vport device (for kernel callers)
769 * @vport: vport to delete.
771 * Deletes the specified device. The device must not be currently attached to
772 * a datapath. It is possible to fail for reasons such as lack of memory.
773 * Both RTNL and vport locks must be held.
775 int vport_del(struct vport *vport)
779 BUG_ON(vport_get_dp_port(vport));
781 unregister_vport(vport);
783 return vport->ops->destroy(vport);
787 * vport_attach - attach a vport to a datapath
789 * @vport: vport to attach.
790 * @dp_port: Datapath port to attach the vport to.
792 * Attaches a vport to a specific datapath so that packets may be exchanged.
793 * Both ports must be currently unattached. @dp_port must be successfully
794 * attached to a vport before it is connected to a datapath and must not be
795 * modified while connected. RTNL lock and the appropriate DP mutex must be held.
797 int vport_attach(struct vport *vport, struct dp_port *dp_port)
801 if (vport_get_dp_port(vport))
804 if (vport->ops->attach) {
807 err = vport->ops->attach(vport);
812 rcu_assign_pointer(vport->dp_port, dp_port);
818 * vport_detach - detach a vport from a datapath
820 * @vport: vport to detach.
822 * Detaches a vport from a datapath. May fail for a variety of reasons,
823 * including lack of memory. RTNL lock and the appropriate DP mutex must be held.
825 int vport_detach(struct vport *vport)
827 struct dp_port *dp_port;
831 dp_port = vport_get_dp_port(vport);
835 rcu_assign_pointer(vport->dp_port, NULL);
837 if (vport->ops->detach)
838 return vport->ops->detach(vport);
844 * vport_set_mtu - set device MTU (for kernel callers)
846 * @vport: vport on which to set MTU.
849 * Sets the MTU of the given device. Some devices may not support setting the
850 * MTU, in which case the result will always be -EOPNOTSUPP. RTNL lock must
853 int vport_set_mtu(struct vport *vport, int mtu)
860 if (vport->ops->set_mtu) {
863 ret = vport->ops->set_mtu(vport, mtu);
865 if (!ret && !is_internal_vport(vport)) {
866 struct dp_port *dp_port = vport_get_dp_port(vport);
869 set_internal_devs_mtu(dp_port->dp);
878 * vport_set_addr - set device Ethernet address (for kernel callers)
880 * @vport: vport on which to set Ethernet address.
881 * @addr: New address.
883 * Sets the Ethernet address of the given device. Some devices may not support
884 * setting the Ethernet address, in which case the result will always be
885 * -EOPNOTSUPP. RTNL lock must be held.
887 int vport_set_addr(struct vport *vport, const unsigned char *addr)
891 if (!is_valid_ether_addr(addr))
892 return -EADDRNOTAVAIL;
894 if (vport->ops->set_addr)
895 return vport->ops->set_addr(vport, addr);
901 * vport_set_stats - sets offset device stats (for kernel callers)
903 * @vport: vport on which to set stats
904 * @stats: stats to set
906 * Provides a set of transmit, receive, and error stats to be added as an
907 * offset to the collect data when stats are retreived. Some devices may not
908 * support setting the stats, in which case the result will always be
909 * -EOPNOTSUPP. RTNL lock must be held.
911 int vport_set_stats(struct vport *vport, struct odp_vport_stats *stats)
915 if (vport->ops->flags & VPORT_F_GEN_STATS) {
916 spin_lock_bh(&vport->stats_lock);
917 memcpy(&vport->offset_stats, stats, sizeof(struct odp_vport_stats));
918 spin_unlock_bh(&vport->stats_lock);
921 } else if (vport->ops->set_stats)
922 return vport->ops->set_stats(vport, stats);
928 * vport_get_name - retrieve device name
930 * @vport: vport from which to retrieve the name.
932 * Retrieves the name of the given device. Either RTNL lock or rcu_read_lock
933 * must be held for the entire duration that the name is in use.
935 const char *vport_get_name(const struct vport *vport)
937 return vport->ops->get_name(vport);
941 * vport_get_type - retrieve device type
943 * @vport: vport from which to retrieve the type.
945 * Retrieves the type of the given device. Either RTNL lock or rcu_read_lock
946 * must be held for the entire duration that the type is in use.
948 const char *vport_get_type(const struct vport *vport)
950 return vport->ops->type;
954 * vport_get_addr - retrieve device Ethernet address (for kernel callers)
956 * @vport: vport from which to retrieve the Ethernet address.
958 * Retrieves the Ethernet address of the given device. Either RTNL lock or
959 * rcu_read_lock must be held for the entire duration that the Ethernet address
962 const unsigned char *vport_get_addr(const struct vport *vport)
964 return vport->ops->get_addr(vport);
968 * vport_get_dp_port - retrieve attached datapath port
970 * @vport: vport from which to retrieve the datapath port.
972 * Retrieves the attached datapath port or null if not attached. Either RTNL
973 * lock or rcu_read_lock must be held for the entire duration that the datapath
974 * port is being accessed.
976 struct dp_port *vport_get_dp_port(const struct vport *vport)
978 return rcu_dereference(vport->dp_port);
982 * vport_get_kobj - retrieve associated kobj
984 * @vport: vport from which to retrieve the associated kobj
986 * Retrieves the associated kobj or null if no kobj. The returned kobj is
987 * valid for as long as the vport exists.
989 struct kobject *vport_get_kobj(const struct vport *vport)
991 if (vport->ops->get_kobj)
992 return vport->ops->get_kobj(vport);
998 * vport_get_stats - retrieve device stats (for kernel callers)
1000 * @vport: vport from which to retrieve the stats
1001 * @stats: location to store stats
1003 * Retrieves transmit, receive, and error stats for the given device.
1005 int vport_get_stats(struct vport *vport, struct odp_vport_stats *stats)
1007 struct odp_vport_stats dev_stats;
1008 struct odp_vport_stats *dev_statsp = NULL;
1011 if (vport->ops->get_stats) {
1012 if (vport->ops->flags & VPORT_F_GEN_STATS)
1013 dev_statsp = &dev_stats;
1018 err = vport->ops->get_stats(vport, dev_statsp);
1025 if (vport->ops->flags & VPORT_F_GEN_STATS) {
1028 /* We potentially have 3 sources of stats that need to be
1029 * combined: those we have collected (split into err_stats and
1030 * percpu_stats), offset_stats from set_stats(), and device
1031 * error stats from get_stats() (for errors that happen
1032 * downstream and therefore aren't reported through our
1033 * vport_record_error() function). */
1035 spin_lock_bh(&vport->stats_lock);
1037 memcpy(stats, &vport->offset_stats, sizeof(struct odp_vport_stats));
1039 stats->rx_errors += vport->err_stats.rx_errors
1040 + vport->err_stats.rx_frame_err
1041 + vport->err_stats.rx_over_err
1042 + vport->err_stats.rx_crc_err;
1043 stats->tx_errors += vport->err_stats.tx_errors;
1044 stats->tx_dropped += vport->err_stats.tx_dropped;
1045 stats->rx_dropped += vport->err_stats.rx_dropped;
1046 stats->rx_over_err += vport->err_stats.rx_over_err;
1047 stats->rx_crc_err += vport->err_stats.rx_crc_err;
1048 stats->rx_frame_err += vport->err_stats.rx_frame_err;
1049 stats->collisions += vport->err_stats.collisions;
1051 spin_unlock_bh(&vport->stats_lock);
1054 stats->rx_errors += dev_statsp->rx_errors;
1055 stats->tx_errors += dev_statsp->tx_errors;
1056 stats->rx_dropped += dev_statsp->rx_dropped;
1057 stats->tx_dropped += dev_statsp->tx_dropped;
1058 stats->rx_over_err += dev_statsp->rx_over_err;
1059 stats->rx_crc_err += dev_statsp->rx_crc_err;
1060 stats->rx_frame_err += dev_statsp->rx_frame_err;
1061 stats->collisions += dev_statsp->collisions;
1064 for_each_possible_cpu(i) {
1065 const struct vport_percpu_stats *percpu_stats;
1067 percpu_stats = per_cpu_ptr(vport->percpu_stats, i);
1068 stats->rx_bytes += percpu_stats->rx_bytes;
1069 stats->rx_packets += percpu_stats->rx_packets;
1070 stats->tx_bytes += percpu_stats->tx_bytes;
1071 stats->tx_packets += percpu_stats->tx_packets;
1083 * vport_get_flags - retrieve device flags
1085 * @vport: vport from which to retrieve the flags
1087 * Retrieves the flags of the given device. Either RTNL lock or rcu_read_lock
1090 unsigned vport_get_flags(const struct vport *vport)
1092 return vport->ops->get_dev_flags(vport);
1096 * vport_get_flags - check whether device is running
1098 * @vport: vport on which to check status.
1100 * Checks whether the given device is running. Either RTNL lock or
1101 * rcu_read_lock must be held.
1103 int vport_is_running(const struct vport *vport)
1105 return vport->ops->is_running(vport);
1109 * vport_get_flags - retrieve device operating state
1111 * @vport: vport from which to check status
1113 * Retrieves the RFC2863 operstate of the given device. Either RTNL lock or
1114 * rcu_read_lock must be held.
1116 unsigned char vport_get_operstate(const struct vport *vport)
1118 return vport->ops->get_operstate(vport);
1122 * vport_get_ifindex - retrieve device system interface index
1124 * @vport: vport from which to retrieve index
1126 * Retrieves the system interface index of the given device. Not all devices
1127 * will have system indexes, in which case the index of the datapath local
1128 * port is returned. Returns a negative index on error. Either RTNL lock or
1129 * rcu_read_lock must be held.
1131 int vport_get_ifindex(const struct vport *vport)
1133 const struct dp_port *dp_port;
1135 if (vport->ops->get_ifindex)
1136 return vport->ops->get_ifindex(vport);
1138 /* If we don't actually have an ifindex, use the local port's.
1139 * Userspace doesn't check it anyways. */
1140 dp_port = vport_get_dp_port(vport);
1144 return vport_get_ifindex(dp_port->dp->ports[ODPP_LOCAL]->vport);
1148 * vport_get_iflink - retrieve device system link index
1150 * @vport: vport from which to retrieve index
1152 * Retrieves the system link index of the given device. The link is the index
1153 * of the interface on which the packet will actually be sent. In most cases
1154 * this is the same as the ifindex but may be different for tunnel devices.
1155 * Returns a negative index on error. Either RTNL lock or rcu_read_lock must
1158 int vport_get_iflink(const struct vport *vport)
1160 if (vport->ops->get_iflink)
1161 return vport->ops->get_iflink(vport);
1163 /* If we don't have an iflink, use the ifindex. In most cases they
1165 return vport_get_ifindex(vport);
1169 * vport_get_mtu - retrieve device MTU (for kernel callers)
1171 * @vport: vport from which to retrieve MTU
1173 * Retrieves the MTU of the given device. Either RTNL lock or rcu_read_lock
1176 int vport_get_mtu(const struct vport *vport)
1178 return vport->ops->get_mtu(vport);
1182 * vport_receive - pass up received packet to the datapath for processing
1184 * @vport: vport that received the packet
1185 * @skb: skb that was received
1187 * Must be called with rcu_read_lock. The packet cannot be shared and
1188 * skb->data should point to the Ethernet header. The caller must have already
1189 * called compute_ip_summed() to initialize the checksumming fields.
1191 void vport_receive(struct vport *vport, struct sk_buff *skb)
1193 struct dp_port *dp_port = vport_get_dp_port(vport);
1196 vport_record_error(vport, VPORT_E_RX_DROPPED);
1202 if (vport->ops->flags & VPORT_F_GEN_STATS) {
1203 struct vport_percpu_stats *stats;
1207 stats = per_cpu_ptr(vport->percpu_stats, smp_processor_id());
1208 stats->rx_packets++;
1209 stats->rx_bytes += skb->len;
1214 if (!(vport->ops->flags & VPORT_F_TUN_ID))
1215 OVS_CB(skb)->tun_id = 0;
1217 dp_process_received_packet(dp_port, skb);
1220 static inline unsigned packet_length(const struct sk_buff *skb)
1222 unsigned length = skb->len - ETH_HLEN;
1224 if (skb->protocol == htons(ETH_P_8021Q))
1225 length -= VLAN_HLEN;
1231 * vport_send - send a packet on a device
1233 * @vport: vport on which to send the packet
1236 * Sends the given packet and returns the length of data sent. Either RTNL
1237 * lock or rcu_read_lock must be held.
1239 int vport_send(struct vport *vport, struct sk_buff *skb)
1245 loop_count = &get_cpu_var(vport_loop_counter).count[!!in_interrupt()];
1248 if (unlikely(*loop_count > VPORT_MAX_LOOPS)) {
1249 if (net_ratelimit())
1250 printk(KERN_WARNING "%s: dropping packet that has looped more than %d times\n",
1251 dp_name(vport_get_dp_port(vport)->dp), VPORT_MAX_LOOPS);
1255 mtu = vport_get_mtu(vport);
1256 if (unlikely(packet_length(skb) > mtu && !skb_is_gso(skb))) {
1257 if (net_ratelimit())
1258 printk(KERN_WARNING "%s: dropped over-mtu packet: %d > %d\n",
1259 dp_name(vport_get_dp_port(vport)->dp), packet_length(skb), mtu);
1263 sent = vport->ops->send(vport, skb);
1265 if (vport->ops->flags & VPORT_F_GEN_STATS && sent > 0) {
1266 struct vport_percpu_stats *stats;
1270 stats = per_cpu_ptr(vport->percpu_stats, smp_processor_id());
1271 stats->tx_packets++;
1272 stats->tx_bytes += sent;
1282 vport_record_error(vport, VPORT_E_TX_DROPPED);
1285 put_cpu_var(vport_loop_counter);
1291 * vport_record_error - indicate device error to generic stats layer
1293 * @vport: vport that encountered the error
1294 * @err_type: one of enum vport_err_type types to indicate the error type
1296 * If using the vport generic stats layer indicate that an error of the given
1299 void vport_record_error(struct vport *vport, enum vport_err_type err_type)
1301 if (vport->ops->flags & VPORT_F_GEN_STATS) {
1303 spin_lock_bh(&vport->stats_lock);
1306 case VPORT_E_RX_DROPPED:
1307 vport->err_stats.rx_dropped++;
1310 case VPORT_E_RX_ERROR:
1311 vport->err_stats.rx_errors++;
1314 case VPORT_E_RX_FRAME:
1315 vport->err_stats.rx_frame_err++;
1318 case VPORT_E_RX_OVER:
1319 vport->err_stats.rx_over_err++;
1322 case VPORT_E_RX_CRC:
1323 vport->err_stats.rx_crc_err++;
1326 case VPORT_E_TX_DROPPED:
1327 vport->err_stats.tx_dropped++;
1330 case VPORT_E_TX_ERROR:
1331 vport->err_stats.tx_errors++;
1334 case VPORT_E_COLLISION:
1335 vport->err_stats.collisions++;
1339 spin_unlock_bh(&vport->stats_lock);