---

yaml --- r: 170885 b: refs/heads/master c: dc34347 h: refs/heads/master i: 170883: 1132c0a v: v3
git-mirror · Oct 29, 2009 · e222bd6 · e222bd6
1 parent 2791292
commit e222bd6
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Showing 3 changed files with 8 additions and 3 deletions.
diff --git a/[refs] b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 345cda2fd695534be5a4494f1b59da9daed33663
+refs/heads/master: dc343475ed062e13fc260acccaab91d7d80fd5b2
diff --git a/trunk/include/linux/rtnetlink.h b/trunk/include/linux/rtnetlink.h
@@ -381,6 +381,7 @@ enum
 #define RTAX_FEATURE_NO_TSTAMP	0x00000004
 #define RTAX_FEATURE_ALLFRAG	0x00000008
 #define RTAX_FEATURE_NO_WSCALE	0x00000010
+#define RTAX_FEATURE_NO_DSACK	0x00000020
 
 struct rta_session
 {

diff --git a/trunk/net/ipv4/tcp_input.c b/trunk/net/ipv4/tcp_input.c
@@ -4080,8 +4080,10 @@ static inline int tcp_sack_extend(struct tcp_sack_block *sp, u32 seq,
 static void tcp_dsack_set(struct sock *sk, u32 seq, u32 end_seq)
 {
 	struct tcp_sock *tp = tcp_sk(sk);
+	struct dst_entry *dst = __sk_dst_get(sk);
 
-	if (tcp_is_sack(tp) && sysctl_tcp_dsack) {
+	if (tcp_is_sack(tp) && sysctl_tcp_dsack &&
+	    !dst_feature(dst, RTAX_FEATURE_NO_DSACK)) {
 		int mib_idx;
 
 		if (before(seq, tp->rcv_nxt))
@@ -4110,13 +4112,15 @@ static void tcp_dsack_extend(struct sock *sk, u32 seq, u32 end_seq)
 static void tcp_send_dupack(struct sock *sk, struct sk_buff *skb)
 {
 	struct tcp_sock *tp = tcp_sk(sk);
+	struct dst_entry *dst = __sk_dst_get(sk);
 
 	if (TCP_SKB_CB(skb)->end_seq != TCP_SKB_CB(skb)->seq &&
 	    before(TCP_SKB_CB(skb)->seq, tp->rcv_nxt)) {
 		NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_DELAYEDACKLOST);
 		tcp_enter_quickack_mode(sk);
 
-		if (tcp_is_sack(tp) && sysctl_tcp_dsack) {
+		if (tcp_is_sack(tp) && sysctl_tcp_dsack &&
+		    !dst_feature(dst, RTAX_FEATURE_NO_DSACK)) {
 			u32 end_seq = TCP_SKB_CB(skb)->end_seq;
 
 			if (after(TCP_SKB_CB(skb)->end_seq, tp->rcv_nxt))