tcp: simplify tcp_mark_skb_lost

This patch consolidates and simplifes the loss marking logic used
by a few loss detections (RACK, RFC6675, NewReno). Previously
each detection uses a subset of several intertwined subroutines.
This unncessary complexity has led to bugs (and fixes of bug fixes).

tcp_mark_skb_lost now is the single one routine to mark a packet loss
when a loss detection caller deems an skb ist lost:

   1. rewind tp->retransmit_hint_skb if skb has lower sequence or
      all lost ones have been retransmitted.

   2. book-keeping: adjust flags and counts depending on if skb was
      retransmitted or not.

Signed-off-by: Yuchung Cheng <ycheng@google.com>
Signed-off-by: Neal Cardwell <ncardwell@google.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 1cf4fcf..63417c4 100644 (file)
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -1006,7 +1006,11 @@ static void tcp_check_sack_reordering(struct sock *sk, const u32 low_seq,
                      ts ? LINUX_MIB_TCPTSREORDER : LINUX_MIB_TCPSACKREORDER);
 }
 
-/* This must be called before lost_out is incremented */
+ /* This must be called before lost_out or retrans_out are updated
+  * on a new loss, because we want to know if all skbs previously
+  * known to be lost have already been retransmitted, indicating
+  * that this newly lost skb is our next skb to retransmit.
+  */
 static void tcp_verify_retransmit_hint(struct tcp_sock *tp, struct sk_buff *skb)
 {
        if ((!tp->retransmit_skb_hint && tp->retrans_out >= tp->lost_out) ||
@@ -1018,32 +1022,25 @@ static void tcp_verify_retransmit_hint(struct tcp_sock *tp, struct sk_buff *skb)
 
 void tcp_mark_skb_lost(struct sock *sk, struct sk_buff *skb)
 {
+       __u8 sacked = TCP_SKB_CB(skb)->sacked;
        struct tcp_sock *tp = tcp_sk(sk);
 
-       tcp_skb_mark_lost_uncond_verify(tp, skb);
-       if (TCP_SKB_CB(skb)->sacked & TCPCB_SACKED_RETRANS) {
-               /* Account for retransmits that are lost again */
-               TCP_SKB_CB(skb)->sacked &= ~TCPCB_SACKED_RETRANS;
-               tp->retrans_out -= tcp_skb_pcount(skb);
-               NET_ADD_STATS(sock_net(sk), LINUX_MIB_TCPLOSTRETRANSMIT,
-                             tcp_skb_pcount(skb));
-       }
-}
-
-/* Sum the number of packets on the wire we have marked as lost.
- * There are two cases we care about here:
- * a) Packet hasn't been marked lost (nor retransmitted),
- *    and this is the first loss.
- * b) Packet has been marked both lost and retransmitted,
- *    and this means we think it was lost again.
- */
-static void tcp_sum_lost(struct tcp_sock *tp, struct sk_buff *skb)
-{
-       __u8 sacked = TCP_SKB_CB(skb)->sacked;
+       if (sacked & TCPCB_SACKED_ACKED)
+               return;
 
-       if (!(sacked & TCPCB_LOST) ||
-           ((sacked & TCPCB_LOST) && (sacked & TCPCB_SACKED_RETRANS)))
-               tp->lost += tcp_skb_pcount(skb);
+       tcp_verify_retransmit_hint(tp, skb);
+       if (sacked & TCPCB_LOST) {
+               if (sacked & TCPCB_SACKED_RETRANS) {
+                       /* Account for retransmits that are lost again */
+                       TCP_SKB_CB(skb)->sacked &= ~TCPCB_SACKED_RETRANS;
+                       tp->retrans_out -= tcp_skb_pcount(skb);
+                       NET_ADD_STATS(sock_net(sk), LINUX_MIB_TCPLOSTRETRANSMIT,
+                                     tcp_skb_pcount(skb));
+               }
+       } else {
+               tp->lost_out += tcp_skb_pcount(skb);
+               TCP_SKB_CB(skb)->sacked |= TCPCB_LOST;
+       }
 }
 
 static void tcp_skb_mark_lost(struct tcp_sock *tp, struct sk_buff *skb)
@@ -1057,17 +1054,6 @@ static void tcp_skb_mark_lost(struct tcp_sock *tp, struct sk_buff *skb)
        }
 }
 
-void tcp_skb_mark_lost_uncond_verify(struct tcp_sock *tp, struct sk_buff *skb)
-{
-       tcp_verify_retransmit_hint(tp, skb);
-
-       tcp_sum_lost(tp, skb);
-       if (!(TCP_SKB_CB(skb)->sacked & (TCPCB_LOST|TCPCB_SACKED_ACKED))) {
-               tp->lost_out += tcp_skb_pcount(skb);
-               TCP_SKB_CB(skb)->sacked |= TCPCB_LOST;
-       }
-}
-
 /* Updates the delivered and delivered_ce counts */
 static void tcp_count_delivered(struct tcp_sock *tp, u32 delivered,
                                bool ece_ack)
@@ -2688,8 +2674,7 @@ void tcp_simple_retransmit(struct sock *sk)
        unsigned int mss = tcp_current_mss(sk);
 
        skb_rbtree_walk(skb, &sk->tcp_rtx_queue) {
-               if (tcp_skb_seglen(skb) > mss &&
-                   !(TCP_SKB_CB(skb)->sacked & TCPCB_SACKED_ACKED))
+               if (tcp_skb_seglen(skb) > mss)
                        tcp_mark_skb_lost(sk, skb);
        }