netdev - Re: [PATCH net v2] sctp: start t5 timer only when peer.rwnd is 0 and local.state is SHUTDOWN

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Message-ID: <20150824130146.GA1097@localhost.localdomain>
Date:	Mon, 24 Aug 2015 10:01:46 -0300
From:	Marcelo Ricardo Leitner <marcelo.leitner@...il.com>
To:	Xin Long <lucien.xin@...il.com>
Cc:	network dev <netdev@...r.kernel.org>, tgraf@...radead.org,
	davem@...emloft.net
Subject: Re: [PATCH net v2] sctp: start t5 timer only when peer.rwnd is 0 and
 local.state is SHUTDOWN_PENDING

On Sun, Aug 23, 2015 at 07:30:40PM +0800, Xin Long wrote:
> when A sends a data to B, then A close() and enter into SHUTDOWN_PENDING state,
> if B neither claim his rwnd is 0 nor send SACK for this data, A will keep
> retransmitting this data util t5 timeout, Max.Retrans times can't work anymore,
> which is bad.
> 
> if B's rwnd is not 0, it should send abord after Max.Retrans times, only when
> B's rwnd == 0 and A's retransmitting beyonds Max.Retrans times, A will start
> t5 timer, which is also commit f8d960524 means, but it lacks the condition
> peer.rwnd == 0.
> 
> Fixes: f8d960524 ("sctp: Enforce retransmission limit during shutdown")
> Signed-off-by: Xin Long <lucien.xin@...il.com>

You still have typos on changelog, but at least not on keywords.
Acked-by: Marcelo Ricardo Leitner <marcelo.leitner@...il.com>

> ---
>  net/sctp/sm_statefuns.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/net/sctp/sm_statefuns.c b/net/sctp/sm_statefuns.c
> index 3ee27b7..deb9eab 100644
> --- a/net/sctp/sm_statefuns.c
> +++ b/net/sctp/sm_statefuns.c
> @@ -5412,7 +5412,8 @@ sctp_disposition_t sctp_sf_do_6_3_3_rtx(struct net *net,
>  	SCTP_INC_STATS(net, SCTP_MIB_T3_RTX_EXPIREDS);
>  
>  	if (asoc->overall_error_count >= asoc->max_retrans) {
> -		if (asoc->state == SCTP_STATE_SHUTDOWN_PENDING) {
> +		if (!q->asoc->peer.rwnd &&
> +		    asoc->state == SCTP_STATE_SHUTDOWN_PENDING) {
>  			/*
>  			 * We are here likely because the receiver had its rwnd
>  			 * closed for a while and we have not been able to
> -- 
> 2.1.0
> 
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