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Message-ID: <4739e642-7fb9-46e2-bef4-77646d343455@gmail.com> Date: Tue, 19 Aug 2025 16:56:10 +0100 From: Pavel Begunkov <asml.silence@...il.com> To: Dragos Tatulea <dtatulea@...dia.com>, almasrymina@...gle.com, "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, Simon Horman <horms@...nel.org> Cc: cratiu@...dia.com, tariqt@...dia.com, parav@...dia.com, Christoph Hellwig <hch@...radead.org>, netdev@...r.kernel.org, linux-kernel@...r.kernel.org Subject: Re: [RFC net-next v3 1/7] queue_api: add support for fetching per queue DMA dev On 8/15/25 12:03, Dragos Tatulea wrote: > For zerocopy (io_uring, devmem), there is an assumption that the > parent device can do DMA. However that is not always the case: > - Scalable Function netdevs [1] have the DMA device in the grandparent. > - For Multi-PF netdevs [2] queues can be associated to different DMA > devices. > > This patch introduces the a queue based interface for allowing drivers > to expose a different DMA device for zerocopy. > > [1] Documentation/networking/device_drivers/ethernet/mellanox/mlx5/switchdev.rst > [2] Documentation/networking/multi-pf-netdev.rst > > Signed-off-by: Dragos Tatulea <dtatulea@...dia.com> > --- > include/net/netdev_queues.h | 20 ++++++++++++++++++++ > 1 file changed, 20 insertions(+) Assuming it'll be moved and uninlined Reviewed-by: Pavel Begunkov <asml.silence@...il.com> -- Pavel Begunkov
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