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 struct vport __rcu *peer;
34 struct device_config __rcu *devconf;
37 /* Protected by RTNL lock. */
38 static struct hlist_head *peer_table;
39 #define PEER_HASH_BUCKETS 256
41 static void update_peers(const char *name, struct vport *);
43 static inline struct patch_vport *patch_vport_priv(const struct vport *vport)
45 return vport_priv(vport);
49 static void free_config(struct rcu_head *rcu)
51 struct device_config *c = container_of(rcu, struct device_config, rcu);
55 static void assign_config_rcu(struct vport *vport,
56 struct device_config *new_config)
58 struct patch_vport *patch_vport = patch_vport_priv(vport);
59 struct device_config *old_config;
61 old_config = rcu_dereference(patch_vport->devconf);
62 rcu_assign_pointer(patch_vport->devconf, new_config);
63 call_rcu(&old_config->rcu, free_config);
66 static struct hlist_head *hash_bucket(const char *name)
68 unsigned int hash = full_name_hash(name, strlen(name));
69 return &peer_table[hash & (PEER_HASH_BUCKETS - 1)];
72 static int patch_init(void)
74 peer_table = kzalloc(PEER_HASH_BUCKETS * sizeof(struct hlist_head),
82 static void patch_exit(void)
87 static int set_config(struct vport *vport, const void *config)
89 struct patch_vport *patch_vport = patch_vport_priv(vport);
90 char peer_name[IFNAMSIZ];
92 strlcpy(peer_name, config, IFNAMSIZ);
94 if (!strcmp(patch_vport->name, peer_name))
97 strcpy(patch_vport->peer_name, peer_name);
102 static struct vport *patch_create(const struct vport_parms *parms)
105 struct patch_vport *patch_vport;
108 vport = vport_alloc(sizeof(struct patch_vport), &patch_vport_ops, parms);
110 err = PTR_ERR(vport);
114 patch_vport = patch_vport_priv(vport);
116 strcpy(patch_vport->name, parms->name);
118 err = set_config(vport, parms->config);
120 goto error_free_vport;
122 patch_vport->devconf = kmalloc(sizeof(struct device_config), GFP_KERNEL);
123 if (!patch_vport->devconf) {
125 goto error_free_vport;
128 vport_gen_rand_ether_addr(patch_vport->devconf->eth_addr);
130 /* Make the default MTU fairly large so that it doesn't become the
131 * bottleneck on systems using jumbo frames. */
132 patch_vport->devconf->mtu = 65535;
134 hlist_add_head(&patch_vport->hash_node, hash_bucket(patch_vport->peer_name));
136 rcu_assign_pointer(patch_vport->peer, vport_locate(patch_vport->peer_name));
137 update_peers(patch_vport->name, vport);
147 static int patch_modify(struct vport *vport, struct odp_port *port)
149 int err = set_config(vport, port->config);
151 struct patch_vport *patch_vport = patch_vport_priv(vport);
153 hlist_del(&patch_vport->hash_node);
154 rcu_assign_pointer(patch_vport->peer, vport_locate(patch_vport->peer_name));
155 hlist_add_head(&patch_vport->hash_node, hash_bucket(patch_vport->peer_name));
160 static void free_port_rcu(struct rcu_head *rcu)
162 struct patch_vport *patch_vport = container_of(rcu,
163 struct patch_vport, rcu);
165 kfree(patch_vport->devconf);
166 vport_free(vport_from_priv(patch_vport));
169 static int patch_destroy(struct vport *vport)
171 struct patch_vport *patch_vport = patch_vport_priv(vport);
173 update_peers(patch_vport->name, NULL);
174 hlist_del(&patch_vport->hash_node);
175 call_rcu(&patch_vport->rcu, free_port_rcu);
180 static void update_peers(const char *name, struct vport *vport)
182 struct hlist_head *bucket = hash_bucket(name);
183 struct patch_vport *peer_vport;
184 struct hlist_node *node;
186 hlist_for_each_entry(peer_vport, node, bucket, hash_node)
187 if (!strcmp(peer_vport->peer_name, name))
188 rcu_assign_pointer(peer_vport->peer, vport);
191 static int patch_set_mtu(struct vport *vport, int mtu)
193 struct patch_vport *patch_vport = patch_vport_priv(vport);
194 struct device_config *devconf;
196 devconf = kmemdup(patch_vport->devconf, sizeof(struct device_config), GFP_KERNEL);
201 assign_config_rcu(vport, devconf);
206 static int patch_set_addr(struct vport *vport, const unsigned char *addr)
208 struct patch_vport *patch_vport = patch_vport_priv(vport);
209 struct device_config *devconf;
211 devconf = kmemdup(patch_vport->devconf, sizeof(struct device_config), GFP_KERNEL);
215 memcpy(devconf->eth_addr, addr, ETH_ALEN);
216 assign_config_rcu(vport, devconf);
222 static const char *patch_get_name(const struct vport *vport)
224 const struct patch_vport *patch_vport = patch_vport_priv(vport);
225 return patch_vport->name;
228 static const unsigned char *patch_get_addr(const struct vport *vport)
230 const struct patch_vport *patch_vport = patch_vport_priv(vport);
231 return rcu_dereference(patch_vport->devconf)->eth_addr;
234 static int patch_get_mtu(const struct vport *vport)
236 const struct patch_vport *patch_vport = patch_vport_priv(vport);
237 return rcu_dereference(patch_vport->devconf)->mtu;
240 static int patch_send(struct vport *vport, struct sk_buff *skb)
242 struct patch_vport *patch_vport = patch_vport_priv(vport);
243 struct vport *peer = rcu_dereference(patch_vport->peer);
244 int skb_len = skb->len;
248 vport_record_error(vport, VPORT_E_TX_DROPPED);
253 vport_receive(peer, skb);
257 const struct vport_ops patch_vport_ops = {
259 .flags = VPORT_F_GEN_STATS,
262 .create = patch_create,
263 .modify = patch_modify,
264 .destroy = patch_destroy,
265 .set_mtu = patch_set_mtu,
266 .set_addr = patch_set_addr,
267 .get_name = patch_get_name,
268 .get_addr = patch_get_addr,
269 .get_dev_flags = vport_gen_get_dev_flags,
270 .is_running = vport_gen_is_running,
271 .get_operstate = vport_gen_get_operstate,
272 .get_mtu = patch_get_mtu,