提交 e93a0435 编写于 作者: E Eric Dumazet 提交者: David S. Miller

tcp: allow segment with FIN in tcp_try_coalesce()

We can allow a segment with FIN to be aggregated,
if we take care to add tcp flags,
and if skb_try_coalesce() takes care of zero sized skbs.
Signed-off-by: NEric Dumazet <edumazet@google.com>
Acked-by: NNeal Cardwell <ncardwell@google.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
上级 e11ecddf
......@@ -3936,6 +3936,7 @@ bool skb_try_coalesce(struct sk_buff *to, struct sk_buff *from,
return false;
if (len <= skb_tailroom(to)) {
if (len)
BUG_ON(skb_copy_bits(from, 0, skb_put(to, len), len));
*delta_truesize = 0;
return true;
......
......@@ -4143,9 +4143,6 @@ static bool tcp_try_coalesce(struct sock *sk,
*fragstolen = false;
if (tcp_hdr(from)->fin)
return false;
/* Its possible this segment overlaps with prior segment in queue */
if (TCP_SKB_CB(from)->seq != TCP_SKB_CB(to)->end_seq)
return false;
......@@ -4158,6 +4155,7 @@ static bool tcp_try_coalesce(struct sock *sk,
NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPRCVCOALESCE);
TCP_SKB_CB(to)->end_seq = TCP_SKB_CB(from)->end_seq;
TCP_SKB_CB(to)->ack_seq = TCP_SKB_CB(from)->ack_seq;
TCP_SKB_CB(to)->tcp_flags |= TCP_SKB_CB(from)->tcp_flags;
return true;
}
......
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