netdev - Re: [PATCH net] net/smc: use the correct ndev to find pnetid by pnetid table

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Message-ID: <20250104084011.15446a17@kernel.org>
Date: Sat, 4 Jan 2025 08:40:11 -0800
From: Jakub Kicinski <kuba@...nel.org>
To: wenjia@...ux.ibm.com, jaka@...ux.ibm.com, alibuda@...ux.alibaba.com,
 tonylu@...ux.alibaba.com, guwen@...ux.alibaba.com
Cc: Guangguan Wang <guangguan.wang@...ux.alibaba.com>, PASIC@...ibm.com,
 davem@...emloft.net, edumazet@...gle.com, pabeni@...hat.com,
 horms@...nel.org, linux-rdma@...r.kernel.org, linux-s390@...r.kernel.org,
 netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net] net/smc: use the correct ndev to find pnetid by
 pnetid table

On Fri, 27 Dec 2024 12:04:55 +0800 Guangguan Wang wrote:
> The command 'smc_pnet -a -I <ethx> <pnetid>' will add <pnetid>
> to the pnetid table and will attach the <pnetid> to net device
> whose name is <ethx>. But When do SMCR by <ethx>, in function
> smc_pnet_find_roce_by_pnetid, it will use <ethx>'s base ndev's
> pnetid to match rdma device, not <ethx>'s pnetid. The asymmetric
> use of the pnetid seems weird. Sometimes it is difficult to know
> the hierarchy of net device what may make it difficult to configure
> the pnetid and to use the pnetid. Looking into the history of
> commit, it was the commit 890a2cb4a966 ("net/smc: rework pnet table")
> that changes the ndev from the <ethx> to the <ethx>'s base ndev
> when finding pnetid by pnetid table. It seems a mistake.
> 
> This patch changes the ndev back to the <ethx> when finding pnetid
> by pnetid table.

SMC maintainers, please review..