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>
15 #include "vport-generic.h"
17 struct device_config {
20 unsigned char eth_addr[ETH_ALEN];
27 /* Protected by RTNL lock. */
28 char peer_name[IFNAMSIZ];
29 struct hlist_node hash_node;
31 /* Protected by RCU. */
34 /* Protected by RCU. */
35 struct device_config *devconf;
38 /* Protected by RTNL lock. */
39 static struct hlist_head *peer_table;
40 #define PEER_HASH_BUCKETS 256
42 static inline struct patch_vport *patch_vport_priv(const struct vport *vport)
44 return vport_priv(vport);
48 static void free_config(struct rcu_head *rcu)
50 struct device_config *c = container_of(rcu, struct device_config, rcu);
54 static void assign_config_rcu(struct vport *vport,
55 struct device_config *new_config)
57 struct patch_vport *patch_vport = patch_vport_priv(vport);
58 struct device_config *old_config;
60 old_config = rcu_dereference(patch_vport->devconf);
61 rcu_assign_pointer(patch_vport->devconf, new_config);
62 call_rcu(&old_config->rcu, free_config);
65 static struct hlist_head *hash_bucket(const char *name)
67 unsigned int hash = full_name_hash(name, strlen(name));
68 return &peer_table[hash & (PEER_HASH_BUCKETS - 1)];
71 static int patch_init(void)
73 peer_table = kzalloc(PEER_HASH_BUCKETS * sizeof(struct hlist_head),
81 static void patch_exit(void)
86 static int set_config(struct vport *vport, const void __user *uconfig)
88 struct patch_vport *patch_vport = patch_vport_priv(vport);
89 char peer_name[IFNAMSIZ];
92 retval = strncpy_from_user(peer_name, uconfig, IFNAMSIZ);
95 else if (retval >= IFNAMSIZ)
98 if (!strcmp(patch_vport->name, peer_name))
101 strcpy(patch_vport->peer_name, peer_name);
103 if (vport_get_dp_port(vport)) {
104 hlist_del(&patch_vport->hash_node);
105 rcu_assign_pointer(patch_vport->peer, vport_locate(patch_vport->peer_name));
106 hlist_add_head(&patch_vport->hash_node, hash_bucket(patch_vport->peer_name));
112 static struct vport *patch_create(const char *name, const void __user *config)
115 struct patch_vport *patch_vport;
118 vport = vport_alloc(sizeof(struct patch_vport), &patch_vport_ops);
120 err = PTR_ERR(vport);
124 patch_vport = patch_vport_priv(vport);
126 strcpy(patch_vport->name, name);
128 err = set_config(vport, config);
130 goto error_free_vport;
132 patch_vport->devconf = kmalloc(sizeof(struct device_config), GFP_KERNEL);
133 if (!patch_vport->devconf) {
135 goto error_free_vport;
138 vport_gen_rand_ether_addr(patch_vport->devconf->eth_addr);
139 patch_vport->devconf->mtu = ETH_DATA_LEN;
149 static int patch_modify(struct vport *vport, const void __user *config)
151 return set_config(vport, config);
154 static int patch_destroy(struct vport *vport)
156 struct patch_vport *patch_vport = patch_vport_priv(vport);
158 kfree(patch_vport->devconf);
164 static void update_peers(const char *name, struct vport *vport)
166 struct hlist_head *bucket = hash_bucket(name);
167 struct patch_vport *peer_vport;
168 struct hlist_node *node;
170 hlist_for_each_entry(peer_vport, node, bucket, hash_node)
171 if (!strcmp(peer_vport->peer_name, name))
172 rcu_assign_pointer(peer_vport->peer, vport);
175 static int patch_attach(struct vport *vport)
177 struct patch_vport *patch_vport = patch_vport_priv(vport);
179 hlist_add_head(&patch_vport->hash_node, hash_bucket(patch_vport->peer_name));
181 rcu_assign_pointer(patch_vport->peer, vport_locate(patch_vport->peer_name));
182 update_peers(patch_vport->name, vport);
187 static int patch_detach(struct vport *vport)
189 struct patch_vport *patch_vport = patch_vport_priv(vport);
191 update_peers(patch_vport->name, NULL);
192 rcu_assign_pointer(patch_vport->peer, NULL);
194 hlist_del(&patch_vport->hash_node);
199 static int patch_set_mtu(struct vport *vport, int mtu)
201 struct patch_vport *patch_vport = patch_vport_priv(vport);
202 struct device_config *devconf;
204 devconf = kmemdup(patch_vport->devconf, sizeof(struct device_config), GFP_KERNEL);
209 assign_config_rcu(vport, devconf);
214 static int patch_set_addr(struct vport *vport, const unsigned char *addr)
216 struct patch_vport *patch_vport = patch_vport_priv(vport);
217 struct device_config *devconf;
219 devconf = kmemdup(patch_vport->devconf, sizeof(struct device_config), GFP_KERNEL);
223 memcpy(devconf->eth_addr, addr, ETH_ALEN);
224 assign_config_rcu(vport, devconf);
230 static const char *patch_get_name(const struct vport *vport)
232 const struct patch_vport *patch_vport = patch_vport_priv(vport);
233 return patch_vport->name;
236 static const unsigned char *patch_get_addr(const struct vport *vport)
238 const struct patch_vport *patch_vport = patch_vport_priv(vport);
239 return rcu_dereference(patch_vport->devconf)->eth_addr;
242 static int patch_get_mtu(const struct vport *vport)
244 const struct patch_vport *patch_vport = patch_vport_priv(vport);
245 return rcu_dereference(patch_vport->devconf)->mtu;
248 static int patch_send(struct vport *vport, struct sk_buff *skb)
250 struct patch_vport *patch_vport = patch_vport_priv(vport);
251 struct vport *peer = rcu_dereference(patch_vport->peer);
252 int skb_len = skb->len;
256 vport_record_error(vport, VPORT_E_TX_DROPPED);
261 vport_receive(peer, skb);
265 struct vport_ops patch_vport_ops = {
267 .flags = VPORT_F_GEN_STATS,
270 .create = patch_create,
271 .modify = patch_modify,
272 .destroy = patch_destroy,
273 .attach = patch_attach,
274 .detach = patch_detach,
275 .set_mtu = patch_set_mtu,
276 .set_addr = patch_set_addr,
277 .get_name = patch_get_name,
278 .get_addr = patch_get_addr,
279 .get_dev_flags = vport_gen_get_dev_flags,
280 .is_running = vport_gen_is_running,
281 .get_operstate = vport_gen_get_operstate,
282 .get_mtu = patch_get_mtu,