netdev - Re: [PATCH net-next] net/smc: return ETIMEDOUT when smc_connect

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Message-ID: <20220216031307.GA2243@e02h04389.eu6sqa>
Date:   Wed, 16 Feb 2022 11:13:07 +0800
From:   "D. Wythe" <alibuda@...ux.alibaba.com>
To:     Karsten Graul <kgraul@...ux.ibm.com>
Cc:     kuba@...nel.org, davem@...emloft.net, netdev@...r.kernel.org,
        linux-s390@...r.kernel.org, linux-rdma@...r.kernel.org
Subject: Re: [PATCH net-next] net/smc: return ETIMEDOUT when
 smc_connect_clc() timeout

On Tue, Feb 15, 2022 at 02:02:37PM +0100, Karsten Graul wrote:
> On 15/02/2022 09:24, D. Wythe wrote:
> > From: "D. Wythe" <alibuda@...ux.alibaba.com>
> > 
> > When smc_connect_clc() times out, it will return -EAGAIN(tcp_recvmsg
> > retuns -EAGAIN while timeout), then this value will passed to the
> > application, which is quite confusing to the applications, makes
> > inconsistency with TCP.
> > 
> > From the manual of connect, ETIMEDOUT is more suitable, and this patch
> > try convert EAGAIN to ETIMEDOUT in that case.
> 
> You say that the sock_recvmsg() in smc_clc_wait_msg() returns -EAGAIN?
> Is there a reason why you translate it in __smc_connect() and not already in
> smc_clc_wait_msg() after the call to sock_recvmsg()?


Because other code that uses smc_clc_wait_msg() handles EAGAIN allready, 
and the only exception is smc_listen_work(), but it doesn't really matter for it. 

The most important thing is that this conversion needs to be determined according to 
the calling scene, convert in smc_clc_wait_msg() is not very suitable.

Thanks.