netdev - Re: [PATCH net] net/smc: Forward wakeup to smc socket waitqueue after fallback

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Message-ID: <a11cc19d-a2c0-32e0-7534-11dac5f6753e@linux.ibm.com>
Date:   Mon, 31 Jan 2022 08:39:52 +0100
From:   Karsten Graul <kgraul@...ux.ibm.com>
To:     Wen Gu <guwen@...ux.alibaba.com>, davem@...emloft.net,
        kuba@...nel.org
Cc:     linux-s390@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH net] net/smc: Forward wakeup to smc socket waitqueue after
 fallback

On 26/01/2022 16:33, Wen Gu wrote:
> When we replace TCP with SMC and a fallback occurs, there may be
> some socket waitqueue entries remaining in smc socket->wq, such
> as eppoll_entries inserted by userspace applications.
> 
> After the fallback, data flows over TCP/IP and only clcsocket->wq
> will be woken up. Applications can't be notified by the entries
> which were inserted in smc socket->wq before fallback. So we need
> a mechanism to wake up smc socket->wq at the same time if some
> entries remaining in it.

Acked-by: Karsten Graul <kgraul@...ux.ibm.com>