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];
29 /* Protected by RTNL lock. */
30 char peer_name[IFNAMSIZ];
31 struct hlist_node hash_node;
33 /* Protected by RCU. */
36 /* Protected by RCU. */
37 struct device_config *devconf;
40 /* Protected by RTNL lock. */
41 static struct hlist_head *peer_table;
42 #define PEER_HASH_BUCKETS 256
44 static void update_peers(const char *name, struct vport *);
46 static inline struct patch_vport *patch_vport_priv(const struct vport *vport)
48 return vport_priv(vport);
52 static void free_config(struct rcu_head *rcu)
54 struct device_config *c = container_of(rcu, struct device_config, rcu);
58 static void assign_config_rcu(struct vport *vport,
59 struct device_config *new_config)
61 struct patch_vport *patch_vport = patch_vport_priv(vport);
62 struct device_config *old_config;
64 old_config = rcu_dereference(patch_vport->devconf);
65 rcu_assign_pointer(patch_vport->devconf, new_config);
66 call_rcu(&old_config->rcu, free_config);
69 static struct hlist_head *hash_bucket(const char *name)
71 unsigned int hash = full_name_hash(name, strlen(name));
72 return &peer_table[hash & (PEER_HASH_BUCKETS - 1)];
75 static int patch_init(void)
77 peer_table = kzalloc(PEER_HASH_BUCKETS * sizeof(struct hlist_head),
85 static void patch_exit(void)
90 static int set_config(struct vport *vport, const void *config)
92 struct patch_vport *patch_vport = patch_vport_priv(vport);
93 char peer_name[IFNAMSIZ];
95 strlcpy(peer_name, config, IFNAMSIZ);
97 if (!strcmp(patch_vport->name, peer_name))
100 strcpy(patch_vport->peer_name, peer_name);
105 static struct vport *patch_create(const struct vport_parms *parms)
108 struct patch_vport *patch_vport;
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 err = set_config(vport, parms->config);
123 goto error_free_vport;
125 patch_vport->devconf = kmalloc(sizeof(struct device_config), GFP_KERNEL);
126 if (!patch_vport->devconf) {
128 goto error_free_vport;
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 hlist_add_head(&patch_vport->hash_node, hash_bucket(patch_vport->peer_name));
139 rcu_assign_pointer(patch_vport->peer, vport_locate(patch_vport->peer_name));
140 update_peers(patch_vport->name, vport);
150 static int patch_modify(struct vport *vport, struct odp_port *port)
152 int err = set_config(vport, port->config);
154 struct patch_vport *patch_vport = patch_vport_priv(vport);
156 hlist_del(&patch_vport->hash_node);
157 rcu_assign_pointer(patch_vport->peer, vport_locate(patch_vport->peer_name));
158 hlist_add_head(&patch_vport->hash_node, hash_bucket(patch_vport->peer_name));
163 static void free_port_rcu(struct rcu_head *rcu)
165 struct patch_vport *patch_vport = container_of(rcu,
166 struct patch_vport, rcu);
168 kfree(patch_vport->devconf);
169 vport_free(vport_from_priv(patch_vport));
172 static int patch_destroy(struct vport *vport)
174 struct patch_vport *patch_vport = patch_vport_priv(vport);
176 update_peers(patch_vport->name, NULL);
177 hlist_del(&patch_vport->hash_node);
178 call_rcu(&patch_vport->rcu, free_port_rcu);
183 static void update_peers(const char *name, struct vport *vport)
185 struct hlist_head *bucket = hash_bucket(name);
186 struct patch_vport *peer_vport;
187 struct hlist_node *node;
189 hlist_for_each_entry(peer_vport, node, bucket, hash_node)
190 if (!strcmp(peer_vport->peer_name, name))
191 rcu_assign_pointer(peer_vport->peer, vport);
194 static int patch_set_mtu(struct vport *vport, int mtu)
196 struct patch_vport *patch_vport = patch_vport_priv(vport);
197 struct device_config *devconf;
199 devconf = kmemdup(patch_vport->devconf, sizeof(struct device_config), GFP_KERNEL);
204 assign_config_rcu(vport, devconf);
209 static int patch_set_addr(struct vport *vport, const unsigned char *addr)
211 struct patch_vport *patch_vport = patch_vport_priv(vport);
212 struct device_config *devconf;
214 devconf = kmemdup(patch_vport->devconf, sizeof(struct device_config), GFP_KERNEL);
218 memcpy(devconf->eth_addr, addr, ETH_ALEN);
219 assign_config_rcu(vport, devconf);
225 static const char *patch_get_name(const struct vport *vport)
227 const struct patch_vport *patch_vport = patch_vport_priv(vport);
228 return patch_vport->name;
231 static const unsigned char *patch_get_addr(const struct vport *vport)
233 const struct patch_vport *patch_vport = patch_vport_priv(vport);
234 return rcu_dereference(patch_vport->devconf)->eth_addr;
237 static int patch_get_mtu(const struct vport *vport)
239 const struct patch_vport *patch_vport = patch_vport_priv(vport);
240 return rcu_dereference(patch_vport->devconf)->mtu;
243 static int patch_send(struct vport *vport, struct sk_buff *skb)
245 struct patch_vport *patch_vport = patch_vport_priv(vport);
246 struct vport *peer = rcu_dereference(patch_vport->peer);
247 int skb_len = skb->len;
251 vport_record_error(vport, VPORT_E_TX_DROPPED);
256 vport_receive(peer, skb);
260 const struct vport_ops patch_vport_ops = {
262 .flags = VPORT_F_GEN_STATS,
265 .create = patch_create,
266 .modify = patch_modify,
267 .destroy = patch_destroy,
268 .set_mtu = patch_set_mtu,
269 .set_addr = patch_set_addr,
270 .get_name = patch_get_name,
271 .get_addr = patch_get_addr,
272 .get_dev_flags = vport_gen_get_dev_flags,
273 .is_running = vport_gen_is_running,
274 .get_operstate = vport_gen_get_operstate,
275 .get_mtu = patch_get_mtu,