On 08/15, Dragos Tatulea wrote: > For TCP zerocopy rx (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. > > The series adds an API for getting the DMA device for a netdev queue. > Drivers that have special requirements can implement the newly added > queue management op. Otherwise the parent will still be used as before. > > This series continues with switching to this API for io_uring zcrx and > devmem and adds a ndo_queue_dma_dev op for mlx5. > > The last part of the series changes devmem rx bind to get the DMA device > per queue and blocks the case when multiple queues use different DMA > devices. The tx bind is left as is. > > [1] Documentation/networking/device_drivers/ethernet/mellanox/mlx5/switchdev.rst > [2] Documentation/networking/multi-pf-netdev.rst > > Signed-off-by: Dragos Tatulea <dtatulea@xxxxxxxxxx> > > ---- > Changes sice v2 [3]: > - Downgraded to RFC status until consensus is reached. > - Implemented more generic approach as discussed during > v2 review. > - Refactor devmem to get DMA device for multiple rx queues for > multi PF netdev support. > - Renamed series with a more generic name. > > Changes since v1 [2]: > - Dropped the Fixes tag. > - Added more documentation as requeseted. > - Renamed the patch title to better reflect its purpose. > > Changes since RFC [1]: > - Upgraded from RFC status. > - Dropped driver specific bits for generic solution. > - Implemented single patch as a fix as requested in RFC. > - Handling of multi-PF netdevs will be handled in a subsequent patch > series. > > [1] RFC: https://lore.kernel.org/all/20250702172433.1738947-2-dtatulea@xxxxxxxxxx/ > [2] v1: https://lore.kernel.org/all/20250709124059.516095-2-dtatulea@xxxxxxxxxx/ > [3] v2: https://lore.kernel.org/all/20250711092634.2733340-2-dtatulea@xxxxxxxxxx/ > --- > Dragos Tatulea (7): > queue_api: add support for fetching per queue DMA dev [..] > io_uring/zcrx: add support for custom DMA devices Did something happen to 2/7? I don't see it in my mailbox and in the lore..
