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tcp: do not try to defer skbs with eor mark (MSG_EOR)
Applications using MSG_EOR are giving a strong hint to TCP stack : Subsequent sendmsg() can not append more bytes to skbs having the EOR mark. Do not try to TSO defer suchs skbs, there is really no hope. Signed-off-by: Eric Dumazet <edumazet@google.com> Acked-by: Soheil Hassas Yeganeh <soheil@google.com> Acked-by: Neal Cardwell <ncardwell@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -1944,6 +1944,10 @@ static bool tcp_tso_should_defer(struct sock *sk, struct sk_buff *skb,
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if ((skb != tcp_write_queue_tail(sk)) && (limit >= skb->len))
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if ((skb != tcp_write_queue_tail(sk)) && (limit >= skb->len))
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goto send_now;
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goto send_now;
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/* If this packet won't get more data, do not wait. */
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if (TCP_SKB_CB(skb)->eor)
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goto send_now;
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win_divisor = READ_ONCE(sock_net(sk)->ipv4.sysctl_tcp_tso_win_divisor);
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win_divisor = READ_ONCE(sock_net(sk)->ipv4.sysctl_tcp_tso_win_divisor);
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if (win_divisor) {
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if (win_divisor) {
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u32 chunk = min(tp->snd_wnd, tp->snd_cwnd * tp->mss_cache);
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u32 chunk = min(tp->snd_wnd, tp->snd_cwnd * tp->mss_cache);
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