netdev - Re: [PATCH V2 net 1/1] net/ipv4: disable SMC TCP option with SYN Cookies

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Date:   Sun, 25 Mar 2018 20:54:20 -0400 (EDT)
From:   David Miller <davem@...emloft.net>
To:     ubraun@...ux.vnet.ibm.com
Cc:     netdev@...r.kernel.org, linux-s390@...r.kernel.org,
        schwidefsky@...ibm.com, heiko.carstens@...ibm.com,
        raspl@...ux.vnet.ibm.com, hwippel@...ux.vnet.ibm.com,
        eric.dumazet@...il.com
Subject: Re: [PATCH V2 net 1/1] net/ipv4: disable SMC TCP option with SYN
 Cookies

From: Ursula Braun <ubraun@...ux.vnet.ibm.com>
Date: Fri, 23 Mar 2018 11:05:45 +0100

> From: Hans Wippel <hwippel@...ux.vnet.ibm.com>
> 
> Currently, the SMC experimental TCP option in a SYN packet is lost on
> the server side when SYN Cookies are active. However, the corresponding
> SYNACK sent back to the client contains the SMC option. This causes an
> inconsistent view of the SMC capabilities on the client and server.
> 
> This patch disables the SMC option in the SYNACK when SYN Cookies are
> active to avoid this issue.
> 
> Fixes: 60e2a7780793b ("tcp: TCP experimental option for SMC")
> Signed-off-by: Hans Wippel <hwippel@...ux.vnet.ibm.com>
> Signed-off-by: Ursula Braun <ubraun@...ux.vnet.ibm.com>

Applied, thank you.