Hi all: Now, some drivers support the zero-copy feature of AF_XDP sockets, which can significantly reduce CPU utilization for XDP programs. This patch set allows TUN to also support the AF_XDP Tx zero-copy feature. It is based on Linux 6.8.0+(openEuler 23.09) and has successfully passed Netperf and Netserver stress testing with multiple streams between VM A and VM B, using AF_XDP and OVS. The performance testing was performed on a Intel E5-2620 2.40GHz machine. Traffic were generated/send through TUN(testpmd txonly with AF_XDP) to VM (testpmd rxonly in guest). +------+---------+---------+---------+ | | copy |zero-copy| speedup | +------+---------+---------+---------+ | UDP | Mpps | Mpps | % | | 64 | 2.5 | 4.0 | 60% | | 512 | 2.1 | 3.6 | 71% | | 1024 | 1.9 | 3.3 | 73% | +------+---------+---------+---------+ Yunjian Wang (3): xsk: Remove non-zero 'dma_page' check in xp_assign_dev vhost_net: Call peek_len when using xdp tun: AF_XDP Tx zero-copy support drivers/net/tun.c | 177 ++++++++++++++++++++++++++++++++++++++-- drivers/vhost/net.c | 21 +++-- include/linux/if_tun.h | 32 ++++++++ net/xdp/xsk_buff_pool.c | 7 -- 4 files changed, 220 insertions(+), 17 deletions(-) -- 2.41.0
