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/kernel.h>
11 #include <linux/list.h>
12 #include <linux/rtnetlink.h>
16 #include "vport-generic.h"
18 struct device_config {
21 char peer_name[IFNAMSIZ];
22 unsigned char eth_addr[ETH_ALEN];
31 /* Protected by RTNL lock. */
32 struct hlist_node hash_node;
34 struct vport __rcu *peer;
35 struct device_config __rcu *devconf;
38 /* Protected by RTNL lock. */
39 static struct hlist_head *peer_table;
40 #define PEER_HASH_BUCKETS 256
42 static void update_peers(const char *name, struct vport *);
44 static inline struct patch_vport *patch_vport_priv(const struct vport *vport)
46 return vport_priv(vport);
50 static void free_config(struct rcu_head *rcu)
52 struct device_config *c = container_of(rcu, struct device_config, rcu);
56 static void assign_config_rcu(struct vport *vport,
57 struct device_config *new_config)
59 struct patch_vport *patch_vport = patch_vport_priv(vport);
60 struct device_config *old_config;
62 old_config = rtnl_dereference(patch_vport->devconf);
63 rcu_assign_pointer(patch_vport->devconf, new_config);
64 call_rcu(&old_config->rcu, free_config);
67 static struct hlist_head *hash_bucket(const char *name)
69 unsigned int hash = full_name_hash(name, strlen(name));
70 return &peer_table[hash & (PEER_HASH_BUCKETS - 1)];
73 static int patch_init(void)
75 peer_table = kzalloc(PEER_HASH_BUCKETS * sizeof(struct hlist_head),
83 static void patch_exit(void)
88 static int set_config(struct vport *vport, const void *config,
89 struct device_config *devconf)
91 struct patch_vport *patch_vport = patch_vport_priv(vport);
92 char peer_name[IFNAMSIZ];
94 strlcpy(peer_name, config, IFNAMSIZ);
96 if (!strcmp(patch_vport->name, peer_name))
99 strcpy(devconf->peer_name, peer_name);
104 static struct vport *patch_create(const struct vport_parms *parms)
107 struct patch_vport *patch_vport;
108 const char *peer_name;
111 vport = vport_alloc(sizeof(struct patch_vport), &patch_vport_ops, parms);
113 err = PTR_ERR(vport);
117 patch_vport = patch_vport_priv(vport);
119 strcpy(patch_vport->name, parms->name);
121 patch_vport->devconf = kmalloc(sizeof(struct device_config), GFP_KERNEL);
122 if (!patch_vport->devconf) {
124 goto error_free_vport;
127 err = set_config(vport, parms->config, patch_vport->devconf);
129 goto error_free_devconf;
131 vport_gen_rand_ether_addr(patch_vport->devconf->eth_addr);
133 /* Make the default MTU fairly large so that it doesn't become the
134 * bottleneck on systems using jumbo frames. */
135 patch_vport->devconf->mtu = 65535;
137 peer_name = patch_vport->devconf->peer_name;
138 hlist_add_head(&patch_vport->hash_node, hash_bucket(peer_name));
140 rcu_assign_pointer(patch_vport->peer, vport_locate(peer_name));
141 update_peers(patch_vport->name, vport);
146 kfree(patch_vport->devconf);
153 static int patch_modify(struct vport *vport, struct odp_port *port)
155 struct patch_vport *patch_vport = patch_vport_priv(vport);
156 struct device_config *devconf;
159 devconf = kmemdup(patch_vport->devconf, sizeof(struct device_config), GFP_KERNEL);
165 err = set_config(vport, port->config, devconf);
169 assign_config_rcu(vport, devconf);
171 hlist_del(&patch_vport->hash_node);
173 rcu_assign_pointer(patch_vport->peer, vport_locate(devconf->peer_name));
174 hlist_add_head(&patch_vport->hash_node, hash_bucket(devconf->peer_name));
184 static void free_port_rcu(struct rcu_head *rcu)
186 struct patch_vport *patch_vport = container_of(rcu,
187 struct patch_vport, rcu);
189 kfree(patch_vport->devconf);
190 vport_free(vport_from_priv(patch_vport));
193 static int patch_destroy(struct vport *vport)
195 struct patch_vport *patch_vport = patch_vport_priv(vport);
197 update_peers(patch_vport->name, NULL);
198 hlist_del(&patch_vport->hash_node);
199 call_rcu(&patch_vport->rcu, free_port_rcu);
204 static void update_peers(const char *name, struct vport *vport)
206 struct hlist_head *bucket = hash_bucket(name);
207 struct patch_vport *peer_vport;
208 struct hlist_node *node;
210 hlist_for_each_entry(peer_vport, node, bucket, hash_node) {
211 const char *peer_name;
213 peer_name = rtnl_dereference(peer_vport->devconf)->peer_name;
214 if (!strcmp(peer_name, name))
215 rcu_assign_pointer(peer_vport->peer, vport);
219 static int patch_set_mtu(struct vport *vport, int mtu)
221 struct patch_vport *patch_vport = patch_vport_priv(vport);
222 struct device_config *devconf;
224 devconf = kmemdup(patch_vport->devconf, sizeof(struct device_config), GFP_KERNEL);
229 assign_config_rcu(vport, devconf);
234 static int patch_set_addr(struct vport *vport, const unsigned char *addr)
236 struct patch_vport *patch_vport = patch_vport_priv(vport);
237 struct device_config *devconf;
239 devconf = kmemdup(patch_vport->devconf, sizeof(struct device_config), GFP_KERNEL);
243 memcpy(devconf->eth_addr, addr, ETH_ALEN);
244 assign_config_rcu(vport, devconf);
250 static const char *patch_get_name(const struct vport *vport)
252 const struct patch_vport *patch_vport = patch_vport_priv(vport);
253 return patch_vport->name;
256 static const unsigned char *patch_get_addr(const struct vport *vport)
258 const struct patch_vport *patch_vport = patch_vport_priv(vport);
259 return rcu_dereference_rtnl(patch_vport->devconf)->eth_addr;
262 static void patch_get_config(const struct vport *vport, void *config)
264 const struct patch_vport *patch_vport = patch_vport_priv(vport);
265 const char *peer_name;
267 peer_name = rcu_dereference_rtnl(patch_vport->devconf)->peer_name;
268 strlcpy(config, peer_name, VPORT_CONFIG_SIZE);
271 static int patch_get_mtu(const struct vport *vport)
273 const struct patch_vport *patch_vport = patch_vport_priv(vport);
274 return rcu_dereference_rtnl(patch_vport->devconf)->mtu;
277 static int patch_send(struct vport *vport, struct sk_buff *skb)
279 struct patch_vport *patch_vport = patch_vport_priv(vport);
280 struct vport *peer = rcu_dereference(patch_vport->peer);
281 int skb_len = skb->len;
285 vport_record_error(vport, VPORT_E_TX_DROPPED);
290 vport_receive(peer, skb);
294 const struct vport_ops patch_vport_ops = {
296 .flags = VPORT_F_GEN_STATS,
299 .create = patch_create,
300 .modify = patch_modify,
301 .destroy = patch_destroy,
302 .set_mtu = patch_set_mtu,
303 .set_addr = patch_set_addr,
304 .get_name = patch_get_name,
305 .get_addr = patch_get_addr,
306 .get_config = patch_get_config,
307 .get_dev_flags = vport_gen_get_dev_flags,
308 .is_running = vport_gen_is_running,
309 .get_operstate = vport_gen_get_operstate,
310 .get_mtu = patch_get_mtu,