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

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
......@@ -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
{
......
......@@ -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))
......
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