netdev - Re: [PATCH net] net: sctp: Don't transition to PF state when transport has exhausted 'Path.Max.Retrans'.

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Message-ID: <20140425133021.GF14074@hmsreliant.think-freely.org>
Date:	Fri, 25 Apr 2014 09:30:21 -0400
From:	Neil Horman <nhorman@...driver.com>
To:	Karl Heiss <kheiss@...il.com>
Cc:	netdev@...r.kernel.org, linux-sctp@...r.kernel.org,
	davem@...emloft.net, vyasevich@...il.com
Subject: Re: [PATCH net] net: sctp: Don't transition to PF state when
 transport has exhausted 'Path.Max.Retrans'.

On Fri, Apr 25, 2014 at 09:28:40AM -0400, Karl Heiss wrote:
> Don't transition to the PF state on every strike after 'Path.Max.Retrans'.
> Per draft-ietf-tsvwg-sctp-failover-03 Section 5.1.6:
> 
>    Additional (PMR - PFMR) consecutive timeouts on a PF destination
>    confirm the path failure, upon which the destination transitions to the
>    Inactive state.  As described in [RFC4960], the sender (i) SHOULD notify
>    ULP about this state transition, and (ii) transmit heartbeats to the
>    Inactive destination at a lower frequency as described in Section 8.3 of
>    [RFC4960].
> 
> This also prevents sending SCTP_ADDR_UNREACHABLE to the user as the state
> bounces between SCTP_INACTIVE and SCTP_PF for each subsequent strike.
> 
> Signed-off-by: Karl Heiss <kheiss@...il.com>
> ---
>  net/sctp/sm_sideeffect.c |    3 ++-
>  1 files changed, 2 insertions(+), 1 deletions(-)
> 
> diff --git a/net/sctp/sm_sideeffect.c b/net/sctp/sm_sideeffect.c
> index 5d6883f..07f26fe 100644
> --- a/net/sctp/sm_sideeffect.c
> +++ b/net/sctp/sm_sideeffect.c
> @@ -502,7 +502,8 @@ static void sctp_do_8_2_transport_strike(sctp_cmd_seq_t *commands,
>  	if ((transport->state != SCTP_PF) &&
>  	   (transport->state != SCTP_UNCONFIRMED) &&
>  	   (asoc->pf_retrans < transport->pathmaxrxt) &&
> -	   (transport->error_count > asoc->pf_retrans)) {
> +	   (transport->error_count > asoc->pf_retrans) &&
> +	   (transport->error_count <= transport->pathmaxrxt)) {
>  
>  		sctp_assoc_control_transport(asoc, transport,
>  					     SCTP_TRANSPORT_PF,
> -- 
> 1.7.1
> 
> 
Acked-by: Neil Horman <nhorman@...driver.com>

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