linux-kernel - Re: [PATCH v5 0/4] UIO_MEM_DMA

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Message-ID: <20240206075436.4d6b11f2@kernel.org>
Date: Tue, 6 Feb 2024 07:54:36 -0800
From: Jakub Kicinski <kuba@...nel.org>
To: Alexander Lobakin <aleksander.lobakin@...el.com>
Cc: Chris Leech <cleech@...hat.com>, Greg Kroah-Hartman
 <gregkh@...uxfoundation.org>, Nilesh Javali <njavali@...vell.com>,
 Christoph Hellwig <hch@....de>, John Meneghini <jmeneghi@...hat.com>, Lee
 Duncan <lduncan@...e.com>, Mike Christie <michael.christie@...cle.com>,
 Hannes Reinecke <hare@...nel.org>, netdev@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org,
 GR-QLogic-Storage-Upstream@...vell.com
Subject: Re: [PATCH v5 0/4] UIO_MEM_DMA_COHERENT for cnic/bnx2/bnx2x

On Mon, 5 Feb 2024 11:51:00 -0800 Chris Leech wrote:
> > IIRC Jakub mentioned some time ago that he doesn't want to see
> > third-party userspace <-> kernel space communication in the networking
> > drivers, to me this looks exactly like that :z  
> 
> This isn't something anyone likes, but it's an interface that's been in
> the kernel and in use since 2009.  I'm trying to see if it can be fixed
> "enough" to keep existing users functioning.  If not, maybe the cnic
> interface and the stacking protocol drivers (bnx2i/bnx2fc) should be
> marked as broken.

Yeah, is this one of the "converged Ethernet" monstrosities from
the 2000s. All the companies which went deep into this stuff are
now defunct AFAIK, and we're left holding the bag.

Yay.