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tcp: tcp_mark_head_lost is only valid for sack-tcp
so tcp_is_sack/reno checks are removed from tcp_mark_head_lost. Signed-off-by: zhang kai <zhangkaiheb@126.com> Acked-by: Neal Cardwell <ncardwell@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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parent
c75a33c84b
commit
636ef28d6e
1 changed files with 7 additions and 25 deletions
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@ -2183,8 +2183,7 @@ static bool tcp_time_to_recover(struct sock *sk, int flag)
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}
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/* Detect loss in event "A" above by marking head of queue up as lost.
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* For non-SACK(Reno) senders, the first "packets" number of segments
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* are considered lost. For RFC3517 SACK, a segment is considered lost if it
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* For RFC3517 SACK, a segment is considered lost if it
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* has at least tp->reordering SACKed seqments above it; "packets" refers to
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* the maximum SACKed segments to pass before reaching this limit.
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*/
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@ -2192,10 +2191,9 @@ static void tcp_mark_head_lost(struct sock *sk, int packets, int mark_head)
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{
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struct tcp_sock *tp = tcp_sk(sk);
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struct sk_buff *skb;
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int cnt, oldcnt, lost;
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unsigned int mss;
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int cnt;
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/* Use SACK to deduce losses of new sequences sent during recovery */
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const u32 loss_high = tcp_is_sack(tp) ? tp->snd_nxt : tp->high_seq;
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const u32 loss_high = tp->snd_nxt;
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WARN_ON(packets > tp->packets_out);
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skb = tp->lost_skb_hint;
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@ -2218,26 +2216,11 @@ static void tcp_mark_head_lost(struct sock *sk, int packets, int mark_head)
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if (after(TCP_SKB_CB(skb)->end_seq, loss_high))
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break;
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oldcnt = cnt;
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if (tcp_is_reno(tp) ||
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(TCP_SKB_CB(skb)->sacked & TCPCB_SACKED_ACKED))
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if (TCP_SKB_CB(skb)->sacked & TCPCB_SACKED_ACKED)
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cnt += tcp_skb_pcount(skb);
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if (cnt > packets) {
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if (tcp_is_sack(tp) ||
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(TCP_SKB_CB(skb)->sacked & TCPCB_SACKED_ACKED) ||
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(oldcnt >= packets))
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break;
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mss = tcp_skb_mss(skb);
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/* If needed, chop off the prefix to mark as lost. */
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lost = (packets - oldcnt) * mss;
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if (lost < skb->len &&
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tcp_fragment(sk, TCP_FRAG_IN_RTX_QUEUE, skb,
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lost, mss, GFP_ATOMIC) < 0)
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break;
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cnt = packets;
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}
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if (cnt > packets)
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break;
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tcp_skb_mark_lost(tp, skb);
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@ -2849,8 +2832,7 @@ static void tcp_fastretrans_alert(struct sock *sk, const u32 prior_snd_una,
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if (tcp_try_undo_partial(sk, prior_snd_una))
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return;
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/* Partial ACK arrived. Force fast retransmit. */
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do_lost = tcp_is_reno(tp) ||
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tcp_force_fast_retransmit(sk);
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do_lost = tcp_force_fast_retransmit(sk);
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}
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if (tcp_try_undo_dsack(sk)) {
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tcp_try_keep_open(sk);
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