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Commit dc343475 authored by Gilad Ben-Yossef's avatar Gilad Ben-Yossef Committed by David S. Miller
Browse files

Allow disabling of DSACK TCP option per route 



Add and use no DSCAK bit in the features field.

Signed-off-by: default avatarGilad Ben-Yossef <gilad@codefidence.com>
Sigend-off-by: default avatarOri Finkelman <ori@comsleep.com>
Sigend-off-by: default avatarYony Amit <yony@comsleep.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 345cda2f

include/linux/rtnetlink.h

+1 −0
Original line number Diff line number Diff line
@@ -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

{

net/ipv4/tcp_input.c

+6 −2
Original line number Diff line number Diff line
@@ -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))