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udp: use limited socket backlog

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Make udp adapt to the limited socket backlog change.

Cc: "David S. Miller" <[email protected]>
Cc: Alexey Kuznetsov <[email protected]>
Cc: "Pekka Savola (ipv6)" <[email protected]>
Cc: Patrick McHardy <[email protected]>
Signed-off-by: Zhu Yi <[email protected]>
Acked-by: Eric Dumazet <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Zhu Yi 2010-03-04 18:01:42 +00:00 • committed by David S. Miller
commit 55349790d7
2 changed files with 22 additions and 12 deletions
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28
net/ipv6/udp.c
View file

@ -583,16 +583,20 @@ static void flush_stack(struct sock **stack, unsigned int count,
bh_lock_sock(sk);
if (!sock_owned_by_user(sk))
udpv6_queue_rcv_skb(sk, skb1);
else
sk_add_backlog(sk, skb1);
else if (sk_add_backlog_limited(sk, skb1)) {
kfree_skb(skb1);
bh_unlock_sock(sk);
goto drop;
}
bh_unlock_sock(sk);
} else {
atomic_inc(&sk->sk_drops);
UDP6_INC_STATS_BH(sock_net(sk),
UDP_MIB_RCVBUFERRORS, IS_UDPLITE(sk));
UDP6_INC_STATS_BH(sock_net(sk),
UDP_MIB_INERRORS, IS_UDPLITE(sk));
continue;
}
drop:
atomic_inc(&sk->sk_drops);
UDP6_INC_STATS_BH(sock_net(sk),
UDP_MIB_RCVBUFERRORS, IS_UDPLITE(sk));
UDP6_INC_STATS_BH(sock_net(sk),
UDP_MIB_INERRORS, IS_UDPLITE(sk));
}
}
/*
@ -754,8 +758,12 @@ int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable,
bh_lock_sock(sk);
if (!sock_owned_by_user(sk))
udpv6_queue_rcv_skb(sk, skb);
else
sk_add_backlog(sk, skb);
else if (sk_add_backlog_limited(sk, skb)) {
atomic_inc(&sk->sk_drops);
bh_unlock_sock(sk);
sock_put(sk);
goto discard;
}
bh_unlock_sock(sk);
sock_put(sk);
return 0;