* Re: [PATCH] net/ipv4: fix the conditions of entering TCP_CA_Disorder state
2013-08-06 0:45 [PATCH] net/ipv4: fix the conditions of entering TCP_CA_Disorder state Dong Fang
@ 2013-08-05 18:16 ` Eric Dumazet
0 siblings, 0 replies; 2+ messages in thread
From: Eric Dumazet @ 2013-08-05 18:16 UTC (permalink / raw)
To: Dong Fang; +Cc: davem, kuznet, jmorris, yoshfuji, kaber, netdev, linux-kernel
On Mon, 2013-08-05 at 20:45 -0400, Dong Fang wrote:
> if have some packets loss by network, the kernel can't reach here, we can see
> the tcp_time_to_recover() function:
>
> static bool tcp_time_to_recover(struct sock *sk, int flag)
> {
> struct tcp_sock *tp = tcp_sk(sk);
> __u32 packets_out;
>
> /* Trick#1: The loss is proven. */
> if (tp->lost_out)
> return true;
> //...
> }
>
> when it return true, the following condition will be failed:
>
> //...
> if (!tcp_time_to_recover(sk, flag)) {
> tcp_try_to_open(sk, flag, prior_unsacked);
> return;
> }
> //...
>
I honestly do not understand this changelog, and how it is related to
the patch.
Also its not 'net/ipv4:' issue but 'tcp:' one
Could you please explain the issue again ?
Thanks !
^ permalink raw reply [flat|nested] 2+ messages in thread
* [PATCH] net/ipv4: fix the conditions of entering TCP_CA_Disorder state
@ 2013-08-06 0:45 Dong Fang
2013-08-05 18:16 ` Eric Dumazet
0 siblings, 1 reply; 2+ messages in thread
From: Dong Fang @ 2013-08-06 0:45 UTC (permalink / raw)
To: davem, kuznet, jmorris, yoshfuji, kaber; +Cc: netdev, linux-kernel, Dong Fang
if have some packets loss by network, the kernel can't reach here, we can see
the tcp_time_to_recover() function:
static bool tcp_time_to_recover(struct sock *sk, int flag)
{
struct tcp_sock *tp = tcp_sk(sk);
__u32 packets_out;
/* Trick#1: The loss is proven. */
if (tp->lost_out)
return true;
//...
}
when it return true, the following condition will be failed:
//...
if (!tcp_time_to_recover(sk, flag)) {
tcp_try_to_open(sk, flag, prior_unsacked);
return;
}
//...
Signed-off-by: Dong Fang <yp.fangdong@gmail.com>
---
net/ipv4/tcp_input.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 28af45a..8ab31c1 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -2449,7 +2449,7 @@ static void tcp_try_keep_open(struct sock *sk)
struct tcp_sock *tp = tcp_sk(sk);
int state = TCP_CA_Open;
- if (tcp_left_out(tp) || tcp_any_retrans_done(sk))
+ if (tp->sacked_out || tcp_any_retrans_done(sk))
state = TCP_CA_Disorder;
if (inet_csk(sk)->icsk_ca_state != state) {
--
1.7.1
^ permalink raw reply related [flat|nested] 2+ messages in thread
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2013-08-05 18:16 ` Eric Dumazet
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