netdev - Re: [PATCH net] net/smc: Fix lookup of netdev by using ib_device_get

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Message-ID: <CAKYAXd9QD5N-mYdGv5Sf1Bx6uBUwghCOWfvYC=_PC_2wDvao+w@mail.gmail.com>
Date: Fri, 8 Nov 2024 08:40:40 +0900
From: Namjae Jeon <linkinjeon@...nel.org>
To: Halil Pasic <pasic@...ux.ibm.com>
Cc: Leon Romanovsky <leon@...nel.org>, Wenjia Zhang <wenjia@...ux.ibm.com>, 
	Wen Gu <guwen@...ux.alibaba.com>, "D. Wythe" <alibuda@...ux.alibaba.com>, 
	Tony Lu <tonylu@...ux.alibaba.com>, David Miller <davem@...emloft.net>, 
	Jakub Kicinski <kuba@...nel.org>, Eric Dumazet <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>, 
	netdev@...r.kernel.org, linux-rdma@...r.kernel.org, 
	linux-s390@...r.kernel.org, Heiko Carstens <hca@...ux.ibm.com>, 
	Jan Karcher <jaka@...ux.ibm.com>, Gerd Bayer <gbayer@...ux.ibm.com>, 
	Alexandra Winter <wintera@...ux.ibm.com>, Nils Hoppmann <niho@...ux.ibm.com>, 
	Niklas Schnell <schnelle@...ux.ibm.com>, Thorsten Winkler <twinkler@...ux.ibm.com>, 
	Karsten Graul <kgraul@...ux.ibm.com>, Stefan Raspl <raspl@...ux.ibm.com>, 
	Aswin K <aswin@...ux.ibm.com>, linux-cifs@...r.kernel.org, 
	Kangjing Huang <huangkangjing@...il.com>
Subject: Re: [PATCH net] net/smc: Fix lookup of netdev by using ib_device_get_netdev()

On Thu, Nov 7, 2024 at 9:00 PM Halil Pasic <pasic@...ux.ibm.com> wrote:
>
> On Wed, 6 Nov 2024 15:59:10 +0200
> Leon Romanovsky <leon@...nel.org> wrote:
>
> > > Does  fs/smb/server/transport_rdma.c qualify as inside of RDMA core code?
> >
> > RDMA core code is drivers/infiniband/core/*.
>
> Understood. So this is a violation of the no direct access to the
> callbacks rule.
>
> >
> > > I would guess it is not, and I would not actually mind sending a patch
> > > but I have trouble figuring out the logic behind  commit ecce70cf17d9
> > > ("ksmbd: fix missing RDMA-capable flag for IPoIB device in
> > > ksmbd_rdma_capable_netdev()").
> >
> > It is strange version of RDMA-CM. All other ULPs use RDMA-CM to avoid
> > GID, netdev and fabric complexity.
>
> I'm not familiar enough with either of the subsystems. Based on your
> answer my guess is that it ain't outright bugous but still a layering
> violation. Copying linux-cifs@...r.kernel.org so that
> the smb are aware.
Could you please elaborate what the violation is ?
I would also appreciate it if you could suggest to me how to fix this.

Thanks.
>
> Thank you very much for all the explanations!
>
> Regards,
> Halil
>