On Fri, Aug 15, 2025 at 08:31:05AM -0700, Stanislav Fomichev wrote: > 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.. I see it in lore: https://lore.kernel.org/all/20250815110401.2254214-4-dtatulea@xxxxxxxxxx But it seems to have been sent to io-uring ml only and since you were not CC'ed, I guess it never reached your inbox... I should have explicitly CC'ed netdev instead of relying on get_maintainers.pl. Will do it next time. Thanks, Dragos
