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Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Simon Horman Cc: cratiu@nvidia.com, tariqt@nvidia.com, parav@nvidia.com, Christoph Hellwig , netdev@vger.kernel.org, linux-kernel@vger.kernel.org References: <20250815110401.2254214-2-dtatulea@nvidia.com> <20250815110401.2254214-3-dtatulea@nvidia.com> Content-Language: en-US From: Pavel Begunkov In-Reply-To: <20250815110401.2254214-3-dtatulea@nvidia.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit 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 > --- > include/net/netdev_queues.h | 20 ++++++++++++++++++++ > 1 file changed, 20 insertions(+) Assuming it'll be moved and uninlined Reviewed-by: Pavel Begunkov -- Pavel Begunkov