On Thu, Feb 02, 2023 at 07:00:25PM +0800, Xuan Zhuo wrote:
> XDP socket(AF_XDP) is an excellent bypass kernel network framework. The zero
> copy feature of xsk (XDP socket) needs to be supported by the driver. The
> performance of zero copy is very good.
Great! Any numbers to share?
> mlx5 and intel ixgbe already support
> this feature, This patch set allows virtio-net to support xsk's zerocopy xmit
> feature.
>
> Virtio-net did not support per-queue reset, so it was impossible to support XDP
> Socket Zerocopy. At present, we have completed the work of Virtio Spec and
> Kernel in Per-Queue Reset. It is time for Virtio-Net to complete the support for
> the XDP Socket Zerocopy.
>
> Virtio-net can not increase the queue at will, so xsk shares the queue with
> kernel.
>
> On the other hand, Virtio-Net does not support generate interrupt manually, so
> when we wakeup tx xmit, we used some tips. If the CPU run by TX NAPI last time
> is other CPUs, use IPI to wake up NAPI on the remote CPU. If it is also the
> local CPU, then we wake up sofrirqd.
>
> Please review.
>
> Thanks.
>
>
> Xuan Zhuo (33):
> virtio_ring: virtqueue_add() support premapped
> virtio_ring: split: virtqueue_add_split() support premapped
> virtio_ring: packed: virtqueue_add_packed() support premapped
> virtio_ring: introduce virtqueue_add_outbuf_premapped()
> virtio_ring: introduce virtqueue_add_inbuf_premapped()
> virtio_ring: introduce virtqueue_reset()
> virtio_ring: add api virtio_dma_map() for advance dma
> virtio_ring: introduce dma sync api for virtio
> xsk: xsk_buff_pool add callback for dma_sync
> xsk: support virtio DMA map
> virtio_net: rename free_old_xmit_skbs to free_old_xmit
> virtio_net: unify the code for recycling the xmit ptr
> virtio_net: virtnet_poll_tx support rescheduled
> virtio_net: independent directory
> virtio_net: move to virtio_net.h
> virtio_net: introduce virtnet_xdp_handler() to seprate the logic of
> run xdp
> virtio_net: receive_small() use virtnet_xdp_handler()
> virtio_net: receive_merageable() use virtnet_xdp_handler()
> virtio_net: introduce virtnet_tx_reset()
> virtio_net: xsk: introduce virtnet_rq_bind_xsk_pool()
> virtio_net: xsk: introduce virtnet_xsk_pool_enable()
> virtio_net: xsk: introduce xsk disable
> virtio_net: xsk: support xsk setup
> virtio_net: xsk: stop disable tx napi
> virtio_net: xsk: __free_old_xmit distinguishes xsk buffer
> virtio_net: virtnet_sq_free_unused_buf() check xsk buffer
> virtio_net: virtnet_rq_free_unused_buf() check xsk buffer
> net: introduce napi_tx_raise()
> virtio_net: xsk: tx: support tx
> virtio_net: xsk: tx: support wakeup
> virtio_net: xsk: tx: auto wakeup when free old xmit
> virtio_net: xsk: rx: introduce add_recvbuf_xsk()
> virtio_net: xsk: rx: introduce receive_xsk() to recv xsk buffer
>
> MAINTAINERS | 2 +-
> drivers/net/Kconfig | 8 +-
> drivers/net/Makefile | 2 +-
> drivers/net/virtio/Kconfig | 11 +
> drivers/net/virtio/Makefile | 8 +
> drivers/net/{virtio_net.c => virtio/main.c} | 564 +++++++-------------
> drivers/net/virtio/virtio_net.h | 317 +++++++++++
> drivers/net/virtio/xsk.c | 524 ++++++++++++++++++
> drivers/net/virtio/xsk.h | 33 ++
> drivers/virtio/virtio_ring.c | 376 +++++++++++--
> include/linux/netdevice.h | 7 +
> include/linux/virtio.h | 29 +
> include/net/xsk_buff_pool.h | 6 +
> net/core/dev.c | 11 +
> net/xdp/xsk_buff_pool.c | 79 ++-
> 15 files changed, 1541 insertions(+), 436 deletions(-)
> create mode 100644 drivers/net/virtio/Kconfig
> create mode 100644 drivers/net/virtio/Makefile
> rename drivers/net/{virtio_net.c => virtio/main.c} (92%)
> create mode 100644 drivers/net/virtio/virtio_net.h
> create mode 100644 drivers/net/virtio/xsk.c
> create mode 100644 drivers/net/virtio/xsk.h
>
> --
> 2.32.0.3.g01195cf9f
