From: Christoph Hellwig <hch@infradead.org>
To: Jakub Kicinski <kuba@kernel.org>
Cc: Christoph Hellwig <hch@infradead.org>,
Dragos Tatulea <dtatulea@nvidia.com>,
"David S. Miller" <davem@davemloft.net>,
Eric Dumazet <edumazet@google.com>,
Paolo Abeni <pabeni@redhat.com>, Simon Horman <horms@kernel.org>,
Andrew Lunn <andrew+netdev@lunn.ch>, Jens Axboe <axboe@kernel.dk>,
parav@nvidia.com, Cosmin Ratio <cratiu@nvidia.com>,
Tariq Toukan <tariqt@nvidia.com>,
Pavel Begunkov <asml.silence@gmail.com>,
Mina Almasry <almasrymina@google.com>,
netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
io-uring@vger.kernel.org
Subject: Re: [PATCH v2 net-next] net: Allow SF devices to be used for ZC DMA
Date: Wed, 16 Jul 2025 04:14:04 -0700 [thread overview]
Message-ID: <aHeJfLYpkmwDvvN8@infradead.org> (raw)
In-Reply-To: <20250715060649.03b3798c@kernel.org>
On Tue, Jul 15, 2025 at 06:06:49AM -0700, Jakub Kicinski wrote:
> On Mon, 14 Jul 2025 21:39:30 -0700 Christoph Hellwig wrote:
> > > LGTM, but we need a better place for this function. netdevice.h is
> > > included directly by 1.5k files, and indirectly by probably another 5k.
> > > It's not a great place to put random helpers with 2 callers.
> > > Maybe net/netdev_rx_queue.h and net/core/netdev_rx_queue.c?
> > > I don't think it needs to be a static inline either.
> >
> > The whole concept is also buggy. Trying to get a dma-able device by
> > walking down from an upper level construct like the netdevice can't work
> > reliably. You'll need to explicitly provide the dma_device using either
> > a method or a pointer to it instead of this guesswork.
>
> Yeah, I'm pretty sure we'll end up with a method in queue ops.
> But it's not that deep, an easy thing to change.
Why not get this right now instead of adding more of the hacky parent
walking?
next prev parent reply other threads:[~2025-07-16 11:14 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-07-11 9:26 [PATCH v2 net-next] net: Allow SF devices to be used for ZC DMA Dragos Tatulea
2025-07-15 1:11 ` Jakub Kicinski
2025-07-15 4:39 ` Christoph Hellwig
2025-07-15 13:06 ` Jakub Kicinski
2025-07-16 11:14 ` Christoph Hellwig [this message]
2025-07-16 11:23 ` Parav Pandit
2025-07-21 7:00 ` Dragos Tatulea
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