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linux-sg2042
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af-packet: Use existing netdev reference for bound sockets. 

This saves a network device lookup on each packet transmitted,
for sockets that are bound to a network device.

Signed-off-by: Ben Greear <greearb@candelatech.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ben Greear 2011-06-01 07:18:53 +00:00 committed by David S. Miller
parent 160ff18a07
commit 827d978037
1 changed files with 15 additions and 12 deletions
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27
net/packet/af_packet.c
View File

@ -974,7 +974,8 @@ static int tpacket_snd(struct packet_sock *po, struct msghdr *msg)
struct sk_buff *skb;
struct net_device *dev;
__be16 proto;
int ifindex, err, reserve = 0;
bool need_rls_dev = false;
int err, reserve = 0;
void *ph;
struct sockaddr_ll *saddr = (struct sockaddr_ll *)msg->msg_name;
int tp_len, size_max;
@ -986,7 +987,7 @@ static int tpacket_snd(struct packet_sock *po, struct msghdr *msg)
err = -EBUSY;
if (saddr == NULL) {
ifindex = po->ifindex;
dev = po->prot_hook.dev;
proto = po->num;
addr = NULL;
} else {
@ -997,12 +998,12 @@ static int tpacket_snd(struct packet_sock *po, struct msghdr *msg)
+ offsetof(struct sockaddr_ll,
sll_addr)))
goto out;
ifindex = saddr->sll_ifindex;
proto = saddr->sll_protocol;
addr = saddr->sll_addr;
dev = dev_get_by_index(sock_net(&po->sk), saddr->sll_ifindex);
need_rls_dev = true;
}
dev = dev_get_by_index(sock_net(&po->sk), ifindex);
err = -ENXIO;
if (unlikely(dev == NULL))
goto out;
@ -1088,7 +1089,8 @@ out_status:
__packet_set_status(po, ph, status);
kfree_skb(skb);
out_put:
dev_put(dev);
if (need_rls_dev)
dev_put(dev);
out:
mutex_unlock(&po->pg_vec_lock);
return err;
@ -1126,8 +1128,9 @@ static int packet_snd(struct socket *sock,
struct sk_buff *skb;
struct net_device *dev;
__be16 proto;
bool need_rls_dev = false;
unsigned char *addr;
int ifindex, err, reserve = 0;
int err, reserve = 0;
struct virtio_net_hdr vnet_hdr = { 0 };
int offset = 0;
int vnet_hdr_len;
@ -1139,7 +1142,7 @@ static int packet_snd(struct socket *sock,
*/
if (saddr == NULL) {
ifindex = po->ifindex;
dev = po->prot_hook.dev;
proto = po->num;
addr = NULL;
} else {
@ -1148,13 +1151,12 @@ static int packet_snd(struct socket *sock,
goto out;
if (msg->msg_namelen < (saddr->sll_halen + offsetof(struct sockaddr_ll, sll_addr)))
goto out;
ifindex = saddr->sll_ifindex;
proto = saddr->sll_protocol;
addr = saddr->sll_addr;
dev = dev_get_by_index(sock_net(sk), saddr->sll_ifindex);
need_rls_dev = true;
}
dev = dev_get_by_index(sock_net(sk), ifindex);
err = -ENXIO;
if (dev == NULL)
goto out_unlock;
@ -1285,14 +1287,15 @@ static int packet_snd(struct socket *sock,
if (err > 0 && (err = net_xmit_errno(err)) != 0)
goto out_unlock;
dev_put(dev);
if (need_rls_dev)
dev_put(dev);
return len;
out_free:
kfree_skb(skb);
out_unlock:
if (dev)
if (dev && need_rls_dev)
dev_put(dev);
out:
return err;