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 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 vport_loop_counter = alloc_percpu(struct percpu_loop_counter);
120 if (!vport_loop_counter) {
125 for (i = 0; i < ARRAY_SIZE(base_vport_ops_list); i++) {
126 struct vport_ops *new_ops = base_vport_ops_list[i];
129 err = new_ops->init();
134 vport_ops_list[n_vport_types++] = new_ops;
135 else if (new_ops->flags & VPORT_F_REQUIRED) {
144 kfree(vport_ops_list);
151 static void vport_del_all(void)
158 for (i = 0; i < VPORT_HASH_BUCKETS; i++) {
159 struct hlist_head *bucket = &dev_table[i];
161 struct hlist_node *node, *next;
163 hlist_for_each_entry_safe(vport, node, next, bucket, hash_node)
172 * vport_exit - shutdown vport subsystem
174 * Called at module exit time to shutdown the vport subsystem and any
175 * initialized vport types.
177 void vport_exit(void)
183 for (i = 0; i < n_vport_types; i++) {
184 if (vport_ops_list[i]->exit)
185 vport_ops_list[i]->exit();
188 free_percpu(vport_loop_counter);
189 kfree(vport_ops_list);
193 static int do_vport_add(struct odp_vport_add *vport_config)
198 vport_config->port_type[VPORT_TYPE_SIZE - 1] = '\0';
199 vport_config->devname[IFNAMSIZ - 1] = '\0';
203 vport = vport_locate(vport_config->devname);
210 vport = vport_add(vport_config->devname, vport_config->port_type,
211 vport_config->config);
215 err = PTR_ERR(vport);
223 * vport_user_add - add vport device (for userspace callers)
225 * @uvport_config: New port configuration.
227 * Creates a new vport with the specified configuration (which is dependent
228 * on device type). This function is for userspace callers and assumes no
231 int vport_user_add(const struct odp_vport_add __user *uvport_config)
233 struct odp_vport_add vport_config;
235 if (copy_from_user(&vport_config, uvport_config, sizeof(struct odp_vport_add)))
238 return do_vport_add(&vport_config);
242 int compat_vport_user_add(struct compat_odp_vport_add *ucompat)
244 struct compat_odp_vport_add compat;
245 struct odp_vport_add vport_config;
247 if (copy_from_user(&compat, ucompat, sizeof(struct compat_odp_vport_add)))
250 memcpy(vport_config.port_type, compat.port_type, VPORT_TYPE_SIZE);
251 memcpy(vport_config.devname, compat.devname, IFNAMSIZ);
252 vport_config.config = compat_ptr(compat.config);
254 return do_vport_add(&vport_config);
258 static int do_vport_mod(struct odp_vport_mod *vport_config)
263 vport_config->devname[IFNAMSIZ - 1] = '\0';
267 vport = vport_locate(vport_config->devname);
274 err = vport_mod(vport, vport_config->config);
283 * vport_user_mod - modify existing vport device (for userspace callers)
285 * @uvport_config: New configuration for vport
287 * Modifies an existing device with the specified configuration (which is
288 * dependent on device type). This function is for userspace callers and
289 * assumes no locks are held.
291 int vport_user_mod(const struct odp_vport_mod __user *uvport_config)
293 struct odp_vport_mod vport_config;
295 if (copy_from_user(&vport_config, uvport_config, sizeof(struct odp_vport_mod)))
298 return do_vport_mod(&vport_config);
302 int compat_vport_user_mod(struct compat_odp_vport_mod *ucompat)
304 struct compat_odp_vport_mod compat;
305 struct odp_vport_mod vport_config;
307 if (copy_from_user(&compat, ucompat, sizeof(struct compat_odp_vport_mod)))
310 memcpy(vport_config.devname, compat.devname, IFNAMSIZ);
311 vport_config.config = compat_ptr(compat.config);
313 return do_vport_mod(&vport_config);
318 * vport_user_del - delete existing vport device (for userspace callers)
320 * @udevname: Name of device to delete
322 * Deletes the specified device. Detaches the device from a datapath first
323 * if it is attached. Deleting the device will fail if it does not exist or it
324 * is the datapath local port. It is also possible to fail for less obvious
325 * reasons, such as lack of memory. This function is for userspace callers and
326 * assumes no locks are held.
328 int vport_user_del(const char __user *udevname)
330 char devname[IFNAMSIZ];
332 struct dp_port *dp_port;
336 retval = strncpy_from_user(devname, udevname, IFNAMSIZ);
339 else if (retval >= IFNAMSIZ)
340 return -ENAMETOOLONG;
344 vport = vport_locate(devname);
350 dp_port = vport_get_dp_port(vport);
352 struct datapath *dp = dp_port->dp;
354 mutex_lock(&dp->mutex);
356 if (!strcmp(dp_name(dp), devname)) {
361 err = dp_detach_port(dp_port, 0);
364 mutex_unlock(&dp->mutex);
371 err = vport_del(vport);
380 * vport_user_stats_get - retrieve device stats (for userspace callers)
382 * @ustats_req: Stats request parameters.
384 * Retrieves transmit, receive, and error stats for the given device. This
385 * function is for userspace callers and assumes no locks are held.
387 int vport_user_stats_get(struct odp_vport_stats_req __user *ustats_req)
389 struct odp_vport_stats_req stats_req;
393 if (copy_from_user(&stats_req, ustats_req, sizeof(struct odp_vport_stats_req)))
396 stats_req.devname[IFNAMSIZ - 1] = '\0';
400 vport = vport_locate(stats_req.devname);
406 err = vport_get_stats(vport, &stats_req.stats);
412 if (copy_to_user(ustats_req, &stats_req, sizeof(struct odp_vport_stats_req)))
419 * vport_user_stats_set - sets offset device stats (for userspace callers)
421 * @ustats_req: Stats set parameters.
423 * Provides a set of transmit, receive, and error stats to be added as an
424 * offset to the collect data when stats are retreived. Some devices may not
425 * support setting the stats, in which case the result will always be
426 * -EOPNOTSUPP. This function is for userspace callers and assumes no locks
429 int vport_user_stats_set(struct odp_vport_stats_req __user *ustats_req)
431 struct odp_vport_stats_req stats_req;
435 if (copy_from_user(&stats_req, ustats_req, sizeof(struct odp_vport_stats_req)))
438 stats_req.devname[IFNAMSIZ - 1] = '\0';
443 vport = vport_locate(stats_req.devname);
449 err = vport_set_stats(vport, &stats_req.stats);
459 * vport_user_ether_get - retrieve device Ethernet address (for userspace callers)
461 * @uvport_ether: Ethernet address request parameters.
463 * Retrieves the Ethernet address of the given device. This function is for
464 * userspace callers and assumes no locks are held.
466 int vport_user_ether_get(struct odp_vport_ether __user *uvport_ether)
468 struct odp_vport_ether vport_ether;
472 if (copy_from_user(&vport_ether, uvport_ether, sizeof(struct odp_vport_ether)))
475 vport_ether.devname[IFNAMSIZ - 1] = '\0';
479 vport = vport_locate(vport_ether.devname);
486 memcpy(vport_ether.ether_addr, vport_get_addr(vport), ETH_ALEN);
493 if (copy_to_user(uvport_ether, &vport_ether, sizeof(struct odp_vport_ether)))
500 * vport_user_ether_set - set device Ethernet address (for userspace callers)
502 * @uvport_ether: Ethernet address request parameters.
504 * Sets the Ethernet address of the given device. Some devices may not support
505 * setting the Ethernet address, in which case the result will always be
506 * -EOPNOTSUPP. This function is for userspace callers and assumes no locks
509 int vport_user_ether_set(struct odp_vport_ether __user *uvport_ether)
511 struct odp_vport_ether vport_ether;
515 if (copy_from_user(&vport_ether, uvport_ether, sizeof(struct odp_vport_ether)))
518 vport_ether.devname[IFNAMSIZ - 1] = '\0';
523 vport = vport_locate(vport_ether.devname);
529 err = vport_set_addr(vport, vport_ether.ether_addr);
538 * vport_user_mtu_get - retrieve device MTU (for userspace callers)
540 * @uvport_mtu: MTU request parameters.
542 * Retrieves the MTU of the given device. This function is for userspace
543 * callers and assumes no locks are held.
545 int vport_user_mtu_get(struct odp_vport_mtu __user *uvport_mtu)
547 struct odp_vport_mtu vport_mtu;
551 if (copy_from_user(&vport_mtu, uvport_mtu, sizeof(struct odp_vport_mtu)))
554 vport_mtu.devname[IFNAMSIZ - 1] = '\0';
558 vport = vport_locate(vport_mtu.devname);
564 vport_mtu.mtu = vport_get_mtu(vport);
570 if (copy_to_user(uvport_mtu, &vport_mtu, sizeof(struct odp_vport_mtu)))
577 * vport_user_mtu_set - set device MTU (for userspace callers)
579 * @uvport_mtu: MTU request parameters.
581 * Sets the MTU of the given device. Some devices may not support setting the
582 * MTU, in which case the result will always be -EOPNOTSUPP. This function is
583 * for userspace callers and assumes no locks are held.
585 int vport_user_mtu_set(struct odp_vport_mtu __user *uvport_mtu)
587 struct odp_vport_mtu vport_mtu;
591 if (copy_from_user(&vport_mtu, uvport_mtu, sizeof(struct odp_vport_mtu)))
594 vport_mtu.devname[IFNAMSIZ - 1] = '\0';
599 vport = vport_locate(vport_mtu.devname);
605 err = vport_set_mtu(vport, vport_mtu.mtu);
613 static struct hlist_head *hash_bucket(const char *name)
615 unsigned int hash = full_name_hash(name, strlen(name));
616 return &dev_table[hash & (VPORT_HASH_BUCKETS - 1)];
620 * vport_locate - find a port that has already been created
622 * @name: name of port to find
624 * Either RTNL or vport lock must be acquired before calling this function
625 * and held while using the found port. See the locking comments at the
628 struct vport *vport_locate(const char *name)
630 struct hlist_head *bucket = hash_bucket(name);
632 struct hlist_node *node;
634 if (unlikely(!mutex_is_locked(&vport_mutex) && !rtnl_is_locked())) {
635 printk(KERN_ERR "openvswitch: neither RTNL nor vport lock held in vport_locate\n");
641 hlist_for_each_entry(vport, node, bucket, hash_node)
642 if (!strcmp(name, vport_get_name(vport)))
652 static void register_vport(struct vport *vport)
654 hlist_add_head(&vport->hash_node, hash_bucket(vport_get_name(vport)));
657 static void unregister_vport(struct vport *vport)
659 hlist_del(&vport->hash_node);
663 * vport_alloc - allocate and initialize new vport
665 * @priv_size: Size of private data area to allocate.
666 * @ops: vport device ops
668 * Allocate and initialize a new vport defined by @ops. The vport will contain
669 * a private data area of size @priv_size that can be accessed using
670 * vport_priv(). vports that are no longer needed should be released with
673 struct vport *vport_alloc(int priv_size, const struct vport_ops *ops)
678 alloc_size = sizeof(struct vport);
680 alloc_size = ALIGN(alloc_size, VPORT_ALIGN);
681 alloc_size += priv_size;
684 vport = kzalloc(alloc_size, GFP_KERNEL);
686 return ERR_PTR(-ENOMEM);
690 if (vport->ops->flags & VPORT_F_GEN_STATS) {
691 vport->percpu_stats = alloc_percpu(struct vport_percpu_stats);
692 if (!vport->percpu_stats)
693 return ERR_PTR(-ENOMEM);
695 spin_lock_init(&vport->stats_lock);
702 * vport_free - uninitialize and free vport
704 * @vport: vport to free
706 * Frees a vport allocated with vport_alloc() when it is no longer needed.
708 void vport_free(struct vport *vport)
710 if (vport->ops->flags & VPORT_F_GEN_STATS)
711 free_percpu(vport->percpu_stats);
717 * vport_add - add vport device (for kernel callers)
719 * @name: Name of new device.
720 * @type: Type of new device (to be matched against types in registered vport
722 * @config: Device type specific configuration. Userspace pointer.
724 * Creates a new vport with the specified configuration (which is dependent
725 * on device type). Both RTNL and vport locks must be held.
727 struct vport *vport_add(const char *name, const char *type, const void __user *config)
736 for (i = 0; i < n_vport_types; i++) {
737 if (!strcmp(vport_ops_list[i]->type, type)) {
738 vport = vport_ops_list[i]->create(name, config);
740 err = PTR_ERR(vport);
744 register_vport(vport);
756 * vport_mod - modify existing vport device (for kernel callers)
758 * @vport: vport to modify.
759 * @config: Device type specific configuration. Userspace pointer.
761 * Modifies an existing device with the specified configuration (which is
762 * dependent on device type). Both RTNL and vport locks must be held.
764 int vport_mod(struct vport *vport, const void __user *config)
769 if (vport->ops->modify)
770 return vport->ops->modify(vport, config);
776 * vport_del - delete existing vport device (for kernel callers)
778 * @vport: vport to delete.
780 * Deletes the specified device. The device must not be currently attached to
781 * a datapath. It is possible to fail for reasons such as lack of memory.
782 * Both RTNL and vport locks must be held.
784 int vport_del(struct vport *vport)
788 BUG_ON(vport_get_dp_port(vport));
790 unregister_vport(vport);
792 return vport->ops->destroy(vport);
796 * vport_attach - attach a vport to a datapath
798 * @vport: vport to attach.
799 * @dp_port: Datapath port to attach the vport to.
801 * Attaches a vport to a specific datapath so that packets may be exchanged.
802 * Both ports must be currently unattached. @dp_port must be successfully
803 * attached to a vport before it is connected to a datapath and must not be
804 * modified while connected. RTNL lock and the appropriate DP mutex must be held.
806 int vport_attach(struct vport *vport, struct dp_port *dp_port)
813 if (vport_get_dp_port(vport))
816 if (vport->ops->attach) {
819 err = vport->ops->attach(vport);
824 dp_port->vport = vport;
825 rcu_assign_pointer(vport->dp_port, dp_port);
831 * vport_detach - detach a vport from a datapath
833 * @vport: vport to detach.
835 * Detaches a vport from a datapath. May fail for a variety of reasons,
836 * including lack of memory. RTNL lock and the appropriate DP mutex must be held.
838 int vport_detach(struct vport *vport)
840 struct dp_port *dp_port;
844 dp_port = vport_get_dp_port(vport);
848 dp_port->vport = NULL;
849 rcu_assign_pointer(vport->dp_port, NULL);
851 if (vport->ops->detach)
852 return vport->ops->detach(vport);
858 * vport_set_mtu - set device MTU (for kernel callers)
860 * @vport: vport on which to set MTU.
863 * Sets the MTU of the given device. Some devices may not support setting the
864 * MTU, in which case the result will always be -EOPNOTSUPP. RTNL lock must
867 int vport_set_mtu(struct vport *vport, int mtu)
874 if (vport->ops->set_mtu) {
877 ret = vport->ops->set_mtu(vport, mtu);
879 if (!ret && !is_internal_vport(vport)) {
880 struct dp_port *dp_port = vport_get_dp_port(vport);
883 set_internal_devs_mtu(dp_port->dp);
892 * vport_set_addr - set device Ethernet address (for kernel callers)
894 * @vport: vport on which to set Ethernet address.
895 * @addr: New address.
897 * Sets the Ethernet address of the given device. Some devices may not support
898 * setting the Ethernet address, in which case the result will always be
899 * -EOPNOTSUPP. RTNL lock must be held.
901 int vport_set_addr(struct vport *vport, const unsigned char *addr)
905 if (!is_valid_ether_addr(addr))
906 return -EADDRNOTAVAIL;
908 if (vport->ops->set_addr)
909 return vport->ops->set_addr(vport, addr);
915 * vport_set_stats - sets offset device stats (for kernel callers)
917 * @vport: vport on which to set stats
918 * @stats: stats to set
920 * Provides a set of transmit, receive, and error stats to be added as an
921 * offset to the collect data when stats are retreived. Some devices may not
922 * support setting the stats, in which case the result will always be
923 * -EOPNOTSUPP. RTNL lock must be held.
925 int vport_set_stats(struct vport *vport, struct odp_vport_stats *stats)
929 if (vport->ops->flags & VPORT_F_GEN_STATS) {
930 spin_lock_bh(&vport->stats_lock);
931 memcpy(&vport->offset_stats, stats, sizeof(struct odp_vport_stats));
932 spin_unlock_bh(&vport->stats_lock);
935 } else if (vport->ops->set_stats)
936 return vport->ops->set_stats(vport, stats);
942 * vport_get_name - retrieve device name
944 * @vport: vport from which to retrieve the name.
946 * Retrieves the name of the given device. Either RTNL lock or rcu_read_lock
947 * must be held for the entire duration that the name is in use.
949 const char *vport_get_name(const struct vport *vport)
951 return vport->ops->get_name(vport);
955 * vport_get_type - retrieve device type
957 * @vport: vport from which to retrieve the type.
959 * Retrieves the type of the given device. Either RTNL lock or rcu_read_lock
960 * must be held for the entire duration that the type is in use.
962 const char *vport_get_type(const struct vport *vport)
964 return vport->ops->type;
968 * vport_get_addr - retrieve device Ethernet address (for kernel callers)
970 * @vport: vport from which to retrieve the Ethernet address.
972 * Retrieves the Ethernet address of the given device. Either RTNL lock or
973 * rcu_read_lock must be held for the entire duration that the Ethernet address
976 const unsigned char *vport_get_addr(const struct vport *vport)
978 return vport->ops->get_addr(vport);
982 * vport_get_dp_port - retrieve attached datapath port
984 * @vport: vport from which to retrieve the datapath port.
986 * Retrieves the attached datapath port or null if not attached. Either RTNL
987 * lock or rcu_read_lock must be held for the entire duration that the datapath
988 * port is being accessed.
990 struct dp_port *vport_get_dp_port(const struct vport *vport)
992 return rcu_dereference(vport->dp_port);
996 * vport_get_kobj - retrieve associated kobj
998 * @vport: vport from which to retrieve the associated kobj
1000 * Retrieves the associated kobj or null if no kobj. The returned kobj is
1001 * valid for as long as the vport exists.
1003 struct kobject *vport_get_kobj(const struct vport *vport)
1005 if (vport->ops->get_kobj)
1006 return vport->ops->get_kobj(vport);
1012 * vport_get_stats - retrieve device stats (for kernel callers)
1014 * @vport: vport from which to retrieve the stats
1015 * @stats: location to store stats
1017 * Retrieves transmit, receive, and error stats for the given device.
1019 int vport_get_stats(struct vport *vport, struct odp_vport_stats *stats)
1021 struct odp_vport_stats dev_stats;
1022 struct odp_vport_stats *dev_statsp = NULL;
1025 if (vport->ops->get_stats) {
1026 if (vport->ops->flags & VPORT_F_GEN_STATS)
1027 dev_statsp = &dev_stats;
1032 err = vport->ops->get_stats(vport, dev_statsp);
1039 if (vport->ops->flags & VPORT_F_GEN_STATS) {
1042 /* We potentially have 3 sources of stats that need to be
1043 * combined: those we have collected (split into err_stats and
1044 * percpu_stats), offset_stats from set_stats(), and device
1045 * error stats from get_stats() (for errors that happen
1046 * downstream and therefore aren't reported through our
1047 * vport_record_error() function). */
1049 spin_lock_bh(&vport->stats_lock);
1051 memcpy(stats, &vport->offset_stats, sizeof(struct odp_vport_stats));
1053 stats->rx_errors += vport->err_stats.rx_errors
1054 + vport->err_stats.rx_frame_err
1055 + vport->err_stats.rx_over_err
1056 + vport->err_stats.rx_crc_err;
1057 stats->tx_errors += vport->err_stats.tx_errors;
1058 stats->tx_dropped += vport->err_stats.tx_dropped;
1059 stats->rx_dropped += vport->err_stats.rx_dropped;
1060 stats->rx_over_err += vport->err_stats.rx_over_err;
1061 stats->rx_crc_err += vport->err_stats.rx_crc_err;
1062 stats->rx_frame_err += vport->err_stats.rx_frame_err;
1063 stats->collisions += vport->err_stats.collisions;
1065 spin_unlock_bh(&vport->stats_lock);
1068 stats->rx_errors += dev_statsp->rx_errors;
1069 stats->tx_errors += dev_statsp->tx_errors;
1070 stats->rx_dropped += dev_statsp->rx_dropped;
1071 stats->tx_dropped += dev_statsp->tx_dropped;
1072 stats->rx_over_err += dev_statsp->rx_over_err;
1073 stats->rx_crc_err += dev_statsp->rx_crc_err;
1074 stats->rx_frame_err += dev_statsp->rx_frame_err;
1075 stats->collisions += dev_statsp->collisions;
1078 for_each_possible_cpu(i) {
1079 const struct vport_percpu_stats *percpu_stats;
1081 percpu_stats = per_cpu_ptr(vport->percpu_stats, i);
1082 stats->rx_bytes += percpu_stats->rx_bytes;
1083 stats->rx_packets += percpu_stats->rx_packets;
1084 stats->tx_bytes += percpu_stats->tx_bytes;
1085 stats->tx_packets += percpu_stats->tx_packets;
1097 * vport_get_flags - retrieve device flags
1099 * @vport: vport from which to retrieve the flags
1101 * Retrieves the flags of the given device. Either RTNL lock or rcu_read_lock
1104 unsigned vport_get_flags(const struct vport *vport)
1106 return vport->ops->get_dev_flags(vport);
1110 * vport_get_flags - check whether device is running
1112 * @vport: vport on which to check status.
1114 * Checks whether the given device is running. Either RTNL lock or
1115 * rcu_read_lock must be held.
1117 int vport_is_running(const struct vport *vport)
1119 return vport->ops->is_running(vport);
1123 * vport_get_flags - retrieve device operating state
1125 * @vport: vport from which to check status
1127 * Retrieves the RFC2863 operstate of the given device. Either RTNL lock or
1128 * rcu_read_lock must be held.
1130 unsigned char vport_get_operstate(const struct vport *vport)
1132 return vport->ops->get_operstate(vport);
1136 * vport_get_ifindex - retrieve device system interface index
1138 * @vport: vport from which to retrieve index
1140 * Retrieves the system interface index of the given device. Not all devices
1141 * will have system indexes, in which case the index of the datapath local
1142 * port is returned. Returns a negative index on error. Either RTNL lock or
1143 * rcu_read_lock must be held.
1145 int vport_get_ifindex(const struct vport *vport)
1147 const struct dp_port *dp_port;
1149 if (vport->ops->get_ifindex)
1150 return vport->ops->get_ifindex(vport);
1152 /* If we don't actually have an ifindex, use the local port's.
1153 * Userspace doesn't check it anyways. */
1154 dp_port = vport_get_dp_port(vport);
1158 return vport_get_ifindex(dp_port->dp->ports[ODPP_LOCAL]->vport);
1162 * vport_get_iflink - retrieve device system link index
1164 * @vport: vport from which to retrieve index
1166 * Retrieves the system link index of the given device. The link is the index
1167 * of the interface on which the packet will actually be sent. In most cases
1168 * this is the same as the ifindex but may be different for tunnel devices.
1169 * Returns a negative index on error. Either RTNL lock or rcu_read_lock must
1172 int vport_get_iflink(const struct vport *vport)
1174 if (vport->ops->get_iflink)
1175 return vport->ops->get_iflink(vport);
1177 /* If we don't have an iflink, use the ifindex. In most cases they
1179 return vport_get_ifindex(vport);
1183 * vport_get_mtu - retrieve device MTU (for kernel callers)
1185 * @vport: vport from which to retrieve MTU
1187 * Retrieves the MTU of the given device. Either RTNL lock or rcu_read_lock
1190 int vport_get_mtu(const struct vport *vport)
1192 return vport->ops->get_mtu(vport);
1196 * vport_receive - pass up received packet to the datapath for processing
1198 * @vport: vport that received the packet
1199 * @skb: skb that was received
1201 * Must be called with rcu_read_lock. The packet cannot be shared and
1202 * skb->data should point to the Ethernet header. The caller must have already
1203 * called compute_ip_summed() to initialize the checksumming fields.
1205 void vport_receive(struct vport *vport, struct sk_buff *skb)
1207 struct dp_port *dp_port = vport_get_dp_port(vport);
1210 vport_record_error(vport, VPORT_E_RX_DROPPED);
1216 if (vport->ops->flags & VPORT_F_GEN_STATS) {
1217 struct vport_percpu_stats *stats;
1221 stats = per_cpu_ptr(vport->percpu_stats, smp_processor_id());
1222 stats->rx_packets++;
1223 stats->rx_bytes += skb->len;
1228 if (!(vport->ops->flags & VPORT_F_TUN_ID))
1229 OVS_CB(skb)->tun_id = 0;
1231 dp_process_received_packet(dp_port, skb);
1234 static inline unsigned packet_length(const struct sk_buff *skb)
1236 unsigned length = skb->len - ETH_HLEN;
1238 if (skb->protocol == htons(ETH_P_8021Q))
1239 length -= VLAN_HLEN;
1245 * vport_send - send a packet on a device
1247 * @vport: vport on which to send the packet
1250 * Sends the given packet and returns the length of data sent. Either RTNL
1251 * lock or rcu_read_lock must be held.
1253 int vport_send(struct vport *vport, struct sk_buff *skb)
1259 loop_count = &per_cpu_ptr(vport_loop_counter, get_cpu())->count[!!in_interrupt()];
1262 if (unlikely(*loop_count > VPORT_MAX_LOOPS)) {
1263 if (net_ratelimit())
1264 printk(KERN_WARNING "%s: dropping packet that has looped more than %d times\n",
1265 dp_name(vport_get_dp_port(vport)->dp), VPORT_MAX_LOOPS);
1269 mtu = vport_get_mtu(vport);
1270 if (unlikely(packet_length(skb) > mtu && !skb_is_gso(skb))) {
1271 if (net_ratelimit())
1272 printk(KERN_WARNING "%s: dropped over-mtu packet: %d > %d\n",
1273 dp_name(vport_get_dp_port(vport)->dp), packet_length(skb), mtu);
1277 sent = vport->ops->send(vport, skb);
1279 if (vport->ops->flags & VPORT_F_GEN_STATS && sent > 0) {
1280 struct vport_percpu_stats *stats;
1284 stats = per_cpu_ptr(vport->percpu_stats, smp_processor_id());
1285 stats->tx_packets++;
1286 stats->tx_bytes += sent;
1296 vport_record_error(vport, VPORT_E_TX_DROPPED);
1305 * vport_record_error - indicate device error to generic stats layer
1307 * @vport: vport that encountered the error
1308 * @err_type: one of enum vport_err_type types to indicate the error type
1310 * If using the vport generic stats layer indicate that an error of the given
1313 void vport_record_error(struct vport *vport, enum vport_err_type err_type)
1315 if (vport->ops->flags & VPORT_F_GEN_STATS) {
1317 spin_lock_bh(&vport->stats_lock);
1320 case VPORT_E_RX_DROPPED:
1321 vport->err_stats.rx_dropped++;
1324 case VPORT_E_RX_ERROR:
1325 vport->err_stats.rx_errors++;
1328 case VPORT_E_RX_FRAME:
1329 vport->err_stats.rx_frame_err++;
1332 case VPORT_E_RX_OVER:
1333 vport->err_stats.rx_over_err++;
1336 case VPORT_E_RX_CRC:
1337 vport->err_stats.rx_crc_err++;
1340 case VPORT_E_TX_DROPPED:
1341 vport->err_stats.tx_dropped++;
1344 case VPORT_E_TX_ERROR:
1345 vport->err_stats.tx_errors++;
1348 case VPORT_E_COLLISION:
1349 vport->err_stats.collisions++;
1353 spin_unlock_bh(&vport->stats_lock);