[PATCH net] tcp: ipv4: initialize unicast_sock sk_pacing_rate

[PATCH net] tcp: ipv4: initialize unicast_sock sk_pacing_rate

[Eric Dumazet]

From: Eric Dumazet <edumazet@google.com>

When I added sk_pacing_rate field, I forgot to initialize its value
in the per cpu unicast_sock used in ip_send_unicast_reply()

This means that for sch_fq users, RST packets, or ACK packets sent
on behalf of TIME_WAIT sockets might be sent to slowly or even dropped
once we reach the per flow limit.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Fixes: 95bd09eb2750 ("tcp: TSO packets automatic sizing")
---
 net/ipv4/ip_output.c |    1 +
 1 file changed, 1 insertion(+)

diff --git a/net/ipv4/ip_output.c b/net/ipv4/ip_output.c
index b50861b22b6bea036b1a99ddf141d7ed2d6cf6cd..38a20a9cca1af327618c816e0695e92e8e152bb5 100644
--- a/net/ipv4/ip_output.c
+++ b/net/ipv4/ip_output.c
@@ -1517,6 +1517,7 @@ static DEFINE_PER_CPU(struct inet_sock, unicast_sock) = {
 		.sk_wmem_alloc	= ATOMIC_INIT(1),
 		.sk_allocation	= GFP_ATOMIC,
 		.sk_flags	= (1UL << SOCK_USE_WRITE_QUEUE),
+		.sk_pacing_rate = ~0U,
 	},
 	.pmtudisc	= IP_PMTUDISC_WANT,
 	.uc_ttl		= -1,

Re: [PATCH net] tcp: ipv4: initialize unicast_sock sk_pacing_rate

[David Miller]

From: Eric Dumazet <eric.dumazet@gmail.com>
Date: Wed, 28 Jan 2015 05:47:11 -0800

> From: Eric Dumazet <edumazet@google.com>
> 
> When I added sk_pacing_rate field, I forgot to initialize its value
> in the per cpu unicast_sock used in ip_send_unicast_reply()
> 
> This means that for sch_fq users, RST packets, or ACK packets sent
> on behalf of TIME_WAIT sockets might be sent to slowly or even dropped
> once we reach the per flow limit.
> 
> Signed-off-by: Eric Dumazet <edumazet@google.com>
> Fixes: 95bd09eb2750 ("tcp: TSO packets automatic sizing")

Applied and queued up for -stable, thanks.