On Thu, 2 Feb 2023 06:08:30 -0500, "Michael S. Tsirkin" <mst@xxxxxxxxxx> wrote:
> 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?
ENV: Qemu with vhost.
vhost cpu | Guest APP CPU |Guest Softirq CPU | PPS
-----------------------------|---------------|------------------|------------
xmit by sockperf: 90% | 100% | | 318967
xmit by xsk: 100% | 30% | 33% | 1192064
recv by sockperf: 100% | 68% | 100% | 692288
recv by xsk: 100% | 33% | 43% | 771670
Thanks.
| | |
> |
> > 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
>
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