[PATCH 3/4 v4] net: Fix for dst_negative_advice
From: Krishna Kumar <hidden>
Date: 2009-10-20 09:49:56
From: Krishna Kumar <redacted> dst_negative_advice() should check for changed dst and reset sk_tx_queue_mapping accordingly. Pass sock to the callers of dst_negative_advice. (sk_reset_txq is defined just for use by dst_negative_advice. The only way I could find to get around this is to move dst_negative_() from dst.h to dst.c, include sock.h in dst.c, etc) Signed-off-by: Krishna Kumar <redacted> --- include/net/dst.h | 12 ++++++++++-- net/core/sock.c | 6 ++++++ net/dccp/timer.c | 4 ++-- net/decnet/af_decnet.c | 2 +- net/ipv4/tcp_timer.c | 4 ++-- 5 files changed, 21 insertions(+), 7 deletions(-) diff -ruNp org/include/net/dst.h new/include/net/dst.h
--- org/include/net/dst.h 2009-10-16 21:30:56.000000000 +0530
+++ new/include/net/dst.h 2009-10-16 21:31:30.000000000 +0530@@ -222,11 +222,19 @@ static inline void dst_confirm(struct ds neigh_confirm(dst->neighbour); } -static inline void dst_negative_advice(struct dst_entry **dst_p) +static inline void dst_negative_advice(struct dst_entry **dst_p, + struct sock *sk) { struct dst_entry * dst = *dst_p; - if (dst && dst->ops->negative_advice) + if (dst && dst->ops->negative_advice) { *dst_p = dst->ops->negative_advice(dst); + + if (dst != *dst_p) { + extern void sk_reset_txq(struct sock *sk); + + sk_reset_txq(sk); + } + } } static inline void dst_link_failure(struct sk_buff *skb)
diff -ruNp org/net/core/sock.c new/net/core/sock.c
--- org/net/core/sock.c 2009-10-16 21:30:56.000000000 +0530
+++ new/net/core/sock.c 2009-10-16 21:32:33.000000000 +0530@@ -352,6 +352,12 @@ discard_and_relse: } EXPORT_SYMBOL(sk_receive_skb); +void sk_reset_txq(struct sock *sk) +{ + sk_tx_queue_clear(sk); +} +EXPORT_SYMBOL(sk_reset_txq); + struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie) { struct dst_entry *dst = sk->sk_dst_cache;
diff -ruNp org/net/dccp/timer.c new/net/dccp/timer.c
--- org/net/dccp/timer.c 2009-10-16 21:30:56.000000000 +0530
+++ new/net/dccp/timer.c 2009-10-16 21:31:30.000000000 +0530@@ -38,7 +38,7 @@ static int dccp_write_timeout(struct soc if (sk->sk_state == DCCP_REQUESTING || sk->sk_state == DCCP_PARTOPEN) { if (icsk->icsk_retransmits != 0) - dst_negative_advice(&sk->sk_dst_cache); + dst_negative_advice(&sk->sk_dst_cache, sk); retry_until = icsk->icsk_syn_retries ? : sysctl_dccp_request_retries; } else {
@@ -63,7 +63,7 @@ static int dccp_write_timeout(struct soc Golden words :-). */ - dst_negative_advice(&sk->sk_dst_cache); + dst_negative_advice(&sk->sk_dst_cache, sk); } retry_until = sysctl_dccp_retries2;
diff -ruNp org/net/decnet/af_decnet.c new/net/decnet/af_decnet.c
--- org/net/decnet/af_decnet.c 2009-10-16 21:30:56.000000000 +0530
+++ new/net/decnet/af_decnet.c 2009-10-16 21:31:30.000000000 +0530@@ -1955,7 +1955,7 @@ static int dn_sendmsg(struct kiocb *iocb } if ((flags & MSG_TRYHARD) && sk->sk_dst_cache) - dst_negative_advice(&sk->sk_dst_cache); + dst_negative_advice(&sk->sk_dst_cache, sk); mss = scp->segsize_rem; fctype = scp->services_rem & NSP_FC_MASK;
diff -ruNp org/net/ipv4/tcp_timer.c new/net/ipv4/tcp_timer.c
--- org/net/ipv4/tcp_timer.c 2009-10-16 21:30:56.000000000 +0530
+++ new/net/ipv4/tcp_timer.c 2009-10-16 21:31:30.000000000 +0530@@ -141,14 +141,14 @@ static int tcp_write_timeout(struct sock if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) { if (icsk->icsk_retransmits) - dst_negative_advice(&sk->sk_dst_cache); + dst_negative_advice(&sk->sk_dst_cache, sk); retry_until = icsk->icsk_syn_retries ? : sysctl_tcp_syn_retries; } else { if (retransmits_timed_out(sk, sysctl_tcp_retries1)) { /* Black hole detection */ tcp_mtu_probing(icsk, sk); - dst_negative_advice(&sk->sk_dst_cache); + dst_negative_advice(&sk->sk_dst_cache, sk); } retry_until = sysctl_tcp_retries2;