2 * Copyright (c) 2010, 2011 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"
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 patch_config __rcu *patchconf;
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 patch_config *c = container_of(rcu, struct patch_config, rcu);
56 static void assign_config_rcu(struct vport *vport,
57 struct patch_config *new_config)
59 struct patch_vport *patch_vport = patch_vport_priv(vport);
60 struct patch_config *old_config;
62 old_config = rtnl_dereference(patch_vport->patchconf);
63 rcu_assign_pointer(patch_vport->patchconf, 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 const struct nla_policy patch_policy[ODP_PATCH_ATTR_MAX + 1] = {
89 #ifdef HAVE_NLA_NUL_STRING
90 [ODP_PATCH_ATTR_PEER] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
94 static int patch_set_config(struct vport *vport, const struct nlattr *options,
95 struct patch_config *patchconf)
97 struct patch_vport *patch_vport = patch_vport_priv(vport);
98 struct nlattr *a[ODP_PATCH_ATTR_MAX + 1];
99 const char *peer_name;
105 err = nla_parse_nested(a, ODP_PATCH_ATTR_MAX, options, patch_policy);
109 if (!a[ODP_PATCH_ATTR_PEER] || VERIFY_NUL_STRING(a[ODP_PATCH_ATTR_PEER], IFNAMSIZ - 1))
112 peer_name = nla_data(a[ODP_PATCH_ATTR_PEER]);
113 if (!strcmp(patch_vport->name, peer_name))
116 strcpy(patchconf->peer_name, peer_name);
121 static struct vport *patch_create(const struct vport_parms *parms)
124 struct patch_vport *patch_vport;
125 const char *peer_name;
126 struct patch_config *patchconf;
129 vport = vport_alloc(sizeof(struct patch_vport), &patch_vport_ops, parms);
131 err = PTR_ERR(vport);
135 patch_vport = patch_vport_priv(vport);
137 strcpy(patch_vport->name, parms->name);
139 patchconf = kmalloc(sizeof(struct patch_config), GFP_KERNEL);
142 goto error_free_vport;
145 err = patch_set_config(vport, parms->options, patchconf);
147 goto error_free_patchconf;
149 vport_gen_rand_ether_addr(patchconf->eth_addr);
151 /* Make the default MTU fairly large so that it doesn't become the
152 * bottleneck on systems using jumbo frames. */
153 patchconf->mtu = 65535;
155 rcu_assign_pointer(patch_vport->patchconf, patchconf);
157 peer_name = patchconf->peer_name;
158 hlist_add_head(&patch_vport->hash_node, hash_bucket(peer_name));
159 rcu_assign_pointer(patch_vport->peer, vport_locate(peer_name));
160 update_peers(patch_vport->name, vport);
164 error_free_patchconf:
172 static void free_port_rcu(struct rcu_head *rcu)
174 struct patch_vport *patch_vport = container_of(rcu,
175 struct patch_vport, rcu);
177 kfree((struct patch_config __force *)patch_vport->patchconf);
178 vport_free(vport_from_priv(patch_vport));
181 static int patch_destroy(struct vport *vport)
183 struct patch_vport *patch_vport = patch_vport_priv(vport);
185 update_peers(patch_vport->name, NULL);
186 hlist_del(&patch_vport->hash_node);
187 call_rcu(&patch_vport->rcu, free_port_rcu);
192 static int patch_set_options(struct vport *vport, struct nlattr *options)
194 struct patch_vport *patch_vport = patch_vport_priv(vport);
195 struct patch_config *patchconf;
198 patchconf = kmemdup(rtnl_dereference(patch_vport->patchconf),
199 sizeof(struct patch_config), GFP_KERNEL);
205 err = patch_set_config(vport, options, patchconf);
209 assign_config_rcu(vport, patchconf);
211 hlist_del(&patch_vport->hash_node);
213 rcu_assign_pointer(patch_vport->peer, vport_locate(patchconf->peer_name));
214 hlist_add_head(&patch_vport->hash_node, hash_bucket(patchconf->peer_name));
224 static void update_peers(const char *name, struct vport *vport)
226 struct hlist_head *bucket = hash_bucket(name);
227 struct patch_vport *peer_vport;
228 struct hlist_node *node;
230 hlist_for_each_entry(peer_vport, node, bucket, hash_node) {
231 const char *peer_name;
233 peer_name = rtnl_dereference(peer_vport->patchconf)->peer_name;
234 if (!strcmp(peer_name, name))
235 rcu_assign_pointer(peer_vport->peer, vport);
239 static int patch_set_mtu(struct vport *vport, int mtu)
241 struct patch_vport *patch_vport = patch_vport_priv(vport);
242 struct patch_config *patchconf;
244 patchconf = kmemdup(rtnl_dereference(patch_vport->patchconf),
245 sizeof(struct patch_config), GFP_KERNEL);
249 patchconf->mtu = mtu;
250 assign_config_rcu(vport, patchconf);
255 static int patch_set_addr(struct vport *vport, const unsigned char *addr)
257 struct patch_vport *patch_vport = patch_vport_priv(vport);
258 struct patch_config *patchconf;
260 patchconf = kmemdup(rtnl_dereference(patch_vport->patchconf),
261 sizeof(struct patch_config), GFP_KERNEL);
265 memcpy(patchconf->eth_addr, addr, ETH_ALEN);
266 assign_config_rcu(vport, patchconf);
272 static const char *patch_get_name(const struct vport *vport)
274 const struct patch_vport *patch_vport = patch_vport_priv(vport);
275 return patch_vport->name;
278 static const unsigned char *patch_get_addr(const struct vport *vport)
280 const struct patch_vport *patch_vport = patch_vport_priv(vport);
281 return rcu_dereference_rtnl(patch_vport->patchconf)->eth_addr;
284 static int patch_get_options(const struct vport *vport, struct sk_buff *skb)
286 struct patch_vport *patch_vport = patch_vport_priv(vport);
287 struct patch_config *patchconf = rcu_dereference_rtnl(patch_vport->patchconf);
289 return nla_put_string(skb, ODP_PATCH_ATTR_PEER, patchconf->peer_name);
292 static int patch_get_mtu(const struct vport *vport)
294 const struct patch_vport *patch_vport = patch_vport_priv(vport);
295 return rcu_dereference_rtnl(patch_vport->patchconf)->mtu;
298 static int patch_send(struct vport *vport, struct sk_buff *skb)
300 struct patch_vport *patch_vport = patch_vport_priv(vport);
301 struct vport *peer = rcu_dereference(patch_vport->peer);
302 int skb_len = skb->len;
306 vport_record_error(vport, VPORT_E_TX_DROPPED);
311 vport_receive(peer, skb);
315 const struct vport_ops patch_vport_ops = {
316 .type = ODP_VPORT_TYPE_PATCH,
317 .flags = VPORT_F_GEN_STATS,
320 .create = patch_create,
321 .destroy = patch_destroy,
322 .set_mtu = patch_set_mtu,
323 .set_addr = patch_set_addr,
324 .get_name = patch_get_name,
325 .get_addr = patch_get_addr,
326 .get_options = patch_get_options,
327 .set_options = patch_set_options,
328 .get_dev_flags = vport_gen_get_dev_flags,
329 .is_running = vport_gen_is_running,
330 .get_operstate = vport_gen_get_operstate,
331 .get_mtu = patch_get_mtu,