XDP socket is an excellent by pass kernel network transmission framework. The zero copy feature of xsk (XDP socket) needs to be supported by the driver. The performance of zero copy is very good. mlx5 and intel ixgbe already support this feature, This patch set allows virtio-net to support xsk's zerocopy xmit feature. And xsk's zerocopy rx has made major changes to virtio-net, and I hope to submit it after this patch set are received. Compared with other drivers, virtio-net does not directly obtain the dma address, so I first obtain the xsk page, and then pass the page to virtio. When recycling the sent packets, we have to distinguish between skb and xdp. Now we have to distinguish between skb, xdp, xsk. #0 #1 made some adjustments to xsk. ---------------- Performance Testing ------------ The udp package tool implemented by the interface of xsk vs sockperf(kernel udp) for performance testing: xsk zero copy xmit in virtio-net: CPU PPS MSGSIZE vhost-cpu 7.9% 511804 64 100% 13.3%% 484373 1500 100% sockperf: CPU PPS MSGSIZE vhost-cpu 100% 375227 64 89.1% 100% 307322 1500 81.5% Xuan Zhuo (8): xsk: XDP_SETUP_XSK_POOL support option check_dma xsk: support get page by addr virtio-net: xsk zero copy xmit setup virtio-net: xsk zero copy xmit implement wakeup and xmit virtio-net: xsk zero copy xmit support xsk unaligned mode virtio-net: xsk zero copy xmit kick by threshold virtio-net: poll tx call xsk zerocopy xmit virtio-net: free old xmit handle xsk drivers/net/virtio_net.c | 449 +++++++++++++++++++++++++++++++++---- include/linux/netdevice.h | 1 + include/net/xdp_sock_drv.h | 11 + net/xdp/xsk_buff_pool.c | 3 +- 4 files changed, 415 insertions(+), 49 deletions(-) -- 2.31.0
