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authorIlpo Järvinen <ilpo.jarvinen@helsinki.fi>2007-03-25 00:03:23 -0400
committerDavid S. Miller <davem@sunset.davemloft.net>2007-10-10 19:47:50 -0400
commitd738cd8fca948e45d53120247cb7a5f5be3ca09e (patch)
treeb2136bcfa2802a21b41de72eb4f6dc338a0bd321 /net/ipv4
parentd961db358f41033a8fc7b62948bc7cff1b4bb1fe (diff)
[TCP]: Add highest_sack seqno, points to globally highest SACK
It is guaranteed to be valid only when !tp->sacked_out. In most cases this seqno is available in the last ACK but there is no guarantee for that. The new fast recovery loss marking algorithm needs this as entry point. Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@helsinki.fi> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4')
-rw-r--r--net/ipv4/tcp_input.c8
1 files changed, 7 insertions, 1 deletions
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index f893e90061eb..813f2049b85d 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -979,8 +979,10 @@ tcp_sacktag_write_queue(struct sock *sk, struct sk_buff *ack_skb, u32 prior_snd_
979 int i; 979 int i;
980 int first_sack_index; 980 int first_sack_index;
981 981
982 if (!tp->sacked_out) 982 if (!tp->sacked_out) {
983 tp->fackets_out = 0; 983 tp->fackets_out = 0;
984 tp->highest_sack = tp->snd_una;
985 }
984 prior_fackets = tp->fackets_out; 986 prior_fackets = tp->fackets_out;
985 987
986 /* Check for D-SACK. */ 988 /* Check for D-SACK. */
@@ -1217,6 +1219,10 @@ tcp_sacktag_write_queue(struct sock *sk, struct sk_buff *ack_skb, u32 prior_snd_
1217 1219
1218 if (fack_count > tp->fackets_out) 1220 if (fack_count > tp->fackets_out)
1219 tp->fackets_out = fack_count; 1221 tp->fackets_out = fack_count;
1222
1223 if (after(TCP_SKB_CB(skb)->seq,
1224 tp->highest_sack))
1225 tp->highest_sack = TCP_SKB_CB(skb)->seq;
1220 } else { 1226 } else {
1221 if (dup_sack && (sacked&TCPCB_RETRANS)) 1227 if (dup_sack && (sacked&TCPCB_RETRANS))
1222 reord = min(fack_count, reord); 1228 reord = min(fack_count, reord);