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
*
43 patch_vport_priv(const struct vport
*vport
)
45 return vport_priv(vport
);
50 free_config(struct rcu_head
*rcu
)
52 struct device_config
*c
= container_of(rcu
, struct device_config
, rcu
);
57 assign_config_rcu(struct vport
*vport
, struct device_config
*new_config
)
59 struct patch_vport
*patch_vport
= patch_vport_priv(vport
);
60 struct device_config
*old_config
;
62 old_config
= rcu_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
*
68 hash_bucket(const char *name
)
70 unsigned int hash
= full_name_hash(name
, strlen(name
));
71 return &peer_table
[hash
& (PEER_HASH_BUCKETS
- 1)];
77 peer_table
= kzalloc(PEER_HASH_BUCKETS
* sizeof(struct hlist_head
),
92 set_config(struct vport
*vport
, const void __user
*uconfig
)
94 struct patch_vport
*patch_vport
= patch_vport_priv(vport
);
95 char peer_name
[IFNAMSIZ
];
98 retval
= strncpy_from_user(peer_name
, uconfig
, IFNAMSIZ
);
101 else if (retval
>= IFNAMSIZ
)
102 return -ENAMETOOLONG
;
104 if (!strcmp(patch_vport
->name
, peer_name
))
107 strcpy(patch_vport
->peer_name
, peer_name
);
109 if (vport_get_dp_port(vport
)) {
110 hlist_del(&patch_vport
->hash_node
);
111 rcu_assign_pointer(patch_vport
->peer
, vport_locate(patch_vport
->peer_name
));
112 hlist_add_head(&patch_vport
->hash_node
, hash_bucket(patch_vport
->peer_name
));
118 static struct vport
*
119 patch_create(const char *name
, const void __user
*config
)
122 struct patch_vport
*patch_vport
;
125 vport
= vport_alloc(sizeof(struct patch_vport
), &patch_vport_ops
);
127 err
= PTR_ERR(vport
);
131 patch_vport
= patch_vport_priv(vport
);
133 strcpy(patch_vport
->name
, name
);
135 err
= set_config(vport
, config
);
137 goto error_free_vport
;
139 patch_vport
->devconf
= kmalloc(sizeof(struct device_config
), GFP_KERNEL
);
140 if (!patch_vport
->devconf
) {
142 goto error_free_vport
;
145 vport_gen_rand_ether_addr(patch_vport
->devconf
->eth_addr
);
146 patch_vport
->devconf
->mtu
= ETH_DATA_LEN
;
157 patch_modify(struct vport
*vport
, const void __user
*config
)
159 return set_config(vport
, config
);
163 patch_destroy(struct vport
*vport
)
165 struct patch_vport
*patch_vport
= patch_vport_priv(vport
);
167 kfree(patch_vport
->devconf
);
174 update_peers(const char *name
, struct vport
*vport
)
176 struct hlist_head
*bucket
= hash_bucket(name
);
177 struct patch_vport
*peer_vport
;
178 struct hlist_node
*node
;
180 hlist_for_each_entry(peer_vport
, node
, bucket
, hash_node
)
181 if (!strcmp(peer_vport
->peer_name
, name
))
182 rcu_assign_pointer(peer_vport
->peer
, vport
);
186 patch_attach(struct vport
*vport
)
188 struct patch_vport
*patch_vport
= patch_vport_priv(vport
);
190 hlist_add_head(&patch_vport
->hash_node
, hash_bucket(patch_vport
->peer_name
));
192 rcu_assign_pointer(patch_vport
->peer
, vport_locate(patch_vport
->peer_name
));
193 update_peers(patch_vport
->name
, vport
);
199 patch_detach(struct vport
*vport
)
201 struct patch_vport
*patch_vport
= patch_vport_priv(vport
);
203 update_peers(patch_vport
->name
, NULL
);
204 rcu_assign_pointer(patch_vport
->peer
, NULL
);
206 hlist_del(&patch_vport
->hash_node
);
212 patch_set_mtu(struct vport
*vport
, int mtu
)
214 struct patch_vport
*patch_vport
= patch_vport_priv(vport
);
215 struct device_config
*devconf
;
217 devconf
= kmemdup(patch_vport
->devconf
, sizeof(struct device_config
), GFP_KERNEL
);
222 assign_config_rcu(vport
, devconf
);
228 patch_set_addr(struct vport
*vport
, const unsigned char *addr
)
230 struct patch_vport
*patch_vport
= patch_vport_priv(vport
);
231 struct device_config
*devconf
;
233 devconf
= kmemdup(patch_vport
->devconf
, sizeof(struct device_config
), GFP_KERNEL
);
237 memcpy(devconf
->eth_addr
, addr
, ETH_ALEN
);
238 assign_config_rcu(vport
, devconf
);
245 patch_get_name(const struct vport
*vport
)
247 const struct patch_vport
*patch_vport
= patch_vport_priv(vport
);
248 return patch_vport
->name
;
251 static const unsigned char *
252 patch_get_addr(const struct vport
*vport
)
254 const struct patch_vport
*patch_vport
= patch_vport_priv(vport
);
255 return rcu_dereference(patch_vport
->devconf
)->eth_addr
;
259 patch_get_mtu(const struct vport
*vport
)
261 const struct patch_vport
*patch_vport
= patch_vport_priv(vport
);
262 return rcu_dereference(patch_vport
->devconf
)->mtu
;
266 patch_send(struct vport
*vport
, struct sk_buff
*skb
)
268 struct patch_vport
*patch_vport
= patch_vport_priv(vport
);
269 struct vport
*peer
= rcu_dereference(patch_vport
->peer
);
270 int skb_len
= skb
->len
;
274 vport_record_error(vport
, VPORT_E_TX_DROPPED
);
279 vport_receive(peer
, skb
);
283 struct vport_ops patch_vport_ops
= {
285 .flags
= VPORT_F_GEN_STATS
,
288 .create
= patch_create
,
289 .modify
= patch_modify
,
290 .destroy
= patch_destroy
,
291 .attach
= patch_attach
,
292 .detach
= patch_detach
,
293 .set_mtu
= patch_set_mtu
,
294 .set_addr
= patch_set_addr
,
295 .get_name
= patch_get_name
,
296 .get_addr
= patch_get_addr
,
297 .get_dev_flags
= vport_gen_get_dev_flags
,
298 .is_running
= vport_gen_is_running
,
299 .get_operstate
= vport_gen_get_operstate
,
300 .get_mtu
= patch_get_mtu
,