linux-kernel - Re: [PATCH net-next v4 1/7] queue_api: add support for fetching per queue DMA dev

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Message-ID: <CAHS8izNto5Na=jAyXhvm0ocL4mA0pUXmXMcn4bwnNvQbA81hzg@mail.gmail.com>
Date: Wed, 20 Aug 2025 15:48:32 -0700
From: Mina Almasry <almasrymina@...gle.com>
To: Dragos Tatulea <dtatulea@...dia.com>
Cc: asml.silence@...il.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>, cratiu@...dia.com, parav@...dia.com, 
	netdev@...r.kernel.org, sdf@...a.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next v4 1/7] queue_api: add support for fetching per
 queue DMA dev

On Wed, Aug 20, 2025 at 10:13 AM Dragos Tatulea <dtatulea@...dia.com> 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>
> Reviewed-by: Pavel Begunkov <asml.silence@...il.com>

Reviewed-by: Mina Almasry <almasrymina@...gle.com>

-- 
Thanks,
Mina