netdev - Re: [PATCH net] s390/ism: ism driver implies smc protocol

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Message-ID: <88bd9c9d-572b-deb7-5d05-9d9432b2c071@linux.alibaba.com>
Date: Thu, 16 Nov 2023 16:26:35 +0800
From: Wen Gu <guwen@...ux.alibaba.com>
To: Gerd Bayer <gbayer@...ux.ibm.com>,
 Alexandra Winter <wintera@...ux.ibm.com>, Wenjia Zhang
 <wenjia@...ux.ibm.com>, Simon Horman <horms@...nel.org>,
 Paolo Abeni <pabeni@...hat.com>, Randy Dunlap <rdunlap@...radead.org>
Cc: Heiko Carstens <hca@...ux.ibm.com>, Vasily Gorbik <gor@...ux.ibm.com>,
 Alexander Gordeev <agordeev@...ux.ibm.com>,
 Christian Borntraeger <borntraeger@...ux.ibm.com>,
 Sven Schnelle <svens@...ux.ibm.com>, alibuda@...ux.alibaba.com,
 tonylu@...ux.alibaba.com, dust.li@...ux.alibaba.com,
 linux-s390@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH net] s390/ism: ism driver implies smc protocol



On 2023/11/14 17:17, Gerd Bayer wrote:
> Since commit a72178cfe855 ("net/smc: Fix dependency of SMC on ISM")
> you can build the ism code without selecting the SMC network protocol.
> That leaves some ism functions be reported as unused. Move these
> functions under the conditional compile with CONFIG_SMC.
> 
> Also codify the suggestion to also configure the SMC protocol in ism's
> Kconfig - but with an "imply" rather than a "select" as SMC depends on
> other config options and allow for a deliberate decision not to build
> SMC. Also, mention that in ISM's help.
> 
> Fixes: a72178cfe855 ("net/smc: Fix dependency of SMC on ISM")
> Reported-by: Randy Dunlap <rdunlap@...radead.org>
> Closes: https://lore.kernel.org/netdev/afd142a2-1fa0-46b9-8b2d-7652d41d3ab8@infradead.org/
> Signed-off-by: Gerd Bayer <gbayer@...ux.ibm.com>
> Reviewed-by: Wenjia Zhang <wenjia@...ux.ibm.com>
> ---
> 
> Hi Randy,
> 
> sorry for the long wait. We had some internal discussions about how to
> tackle this and decided to send out the short-term solution first and
> work on better isolating the ISM device and SMC protocol together
> with the work to extend ISM,
> e.g. at https://lore.kernel.org/netdev/1695568613-125057-1-git-send-email-guwen@linux.alibaba.com/
> 

Hi, Gerd

I like the idea of better isolating ISM and SMC, both from a compilation perspective
and a code perspective. If I come up with any ideas during extending ISM, I will give
a feedback.

Thanks and Regards,
Wen Gu

> Cheers, Gerd
>