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

[Mina Almasry]

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

Reviewed-by: Mina Almasry <almasrymina@xxxxxxxxxx>

-- 
Thanks,
Mina