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	tcp: use limited socket backlog
Make tcp adapt to the limited socket backlog change. Cc: "David S. Miller" <davem@davemloft.net> Cc: Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> Cc: "Pekka Savola (ipv6)" <pekkas@netcore.fi> Cc: Patrick McHardy <kaber@trash.net> Signed-off-by: Zhu Yi <yi.zhu@intel.com> Acked-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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					 2 changed files with 8 additions and 4 deletions
				
			
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			@ -1682,8 +1682,10 @@ int tcp_v4_rcv(struct sk_buff *skb)
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			if (!tcp_prequeue(sk, skb))
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				ret = tcp_v4_do_rcv(sk, skb);
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		}
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	} else
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		sk_add_backlog(sk, skb);
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	} else if (sk_add_backlog_limited(sk, skb)) {
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		bh_unlock_sock(sk);
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		goto discard_and_relse;
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	}
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	bh_unlock_sock(sk);
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	sock_put(sk);
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			@ -1740,8 +1740,10 @@ static int tcp_v6_rcv(struct sk_buff *skb)
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			if (!tcp_prequeue(sk, skb))
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				ret = tcp_v6_do_rcv(sk, skb);
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		}
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	} else
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		sk_add_backlog(sk, skb);
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	} else if (sk_add_backlog_limited(sk, skb)) {
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		bh_unlock_sock(sk);
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		goto discard_and_relse;
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	}
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	bh_unlock_sock(sk);
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	sock_put(sk);
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