Overview ======== This patchset adds a new PMD driver for AF_XDP which is a proposed faster version of AF_PACKET interface in Linux, see below links [1] [2] for details of AF_XDP introduction:
AF_XDP roadmap ============== - AF_XDP is included in upstream kernel since 4.18, and AF_XDP support in libbpf has been merged in bpf-next/master. [3] - Now i40e and ixgbe drivers have supported zero copy mode. Change logs =========== changes vs RFC sent by Qi last Aug: - Re-work base on AF_XDP's interface changes since the new libbpf has provided higher-level APIs that hide many of the details of the AP_XDP uapi. After the rework, it helps to reduce 300+ lines of code. - multi-queues is not supported due to current libbpf doesn't support multi-sockets on a single umem. - No extra steps to load xdp program manually, since the current behavior of libbpf would load a default xdp program when user calls xsk_socket__create. userspace application only needs to handle the cleanup. How to try ========== 1. take the latest bpf-next/master, build kernel and replace your host kernel with it. make sure you turn on XDP sockets when compiling Networking support --> Networking options --> [ * ] XDP sockets 2. build libbpf in tools/lib/bpf, and copy the libbpf.a and libbpf.so to /usr/lib64 cd tools/lib/bpf make 3. extra steps to build dpdk Add below lines to drivers/net/af_xdp/Makefile CFLAGS += -I/<your linux src root>/tools/include CFLAGS += -I/<your linux src root>/tools/lib/bpf add below line to config/common_linuxapp to enble the config for af_xdp pmd CONFIG_RTE_LIBRTE_PMD_AF_XDP=y 4. start testpmd ./build/app/testpmd -c 0xc -n 4 --vdev eth_af_xdp,iface=enp59s0f0,queue=0 -- -i --rxq=1 --txq=1 in this case, default xdp program will be loaded and linked to queue 0 of enp59s0f0, network traffics travel to queue 0 will be redirected to af_xdp socket. [1] https://lwn.net/Articles/750845/ [2] https://fosdem.org/2018/schedule/event/af_xdp/ [3] https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git/commit/?id=143bdc2e27b44d2559596424bfb017d578be33eb Xiaolong Ye (6): net/af_xdp: introduce AF_XDP PMD driver lib/mbuf: enable parse flags when create mempool lib/mempool: allow page size aligned mempool net/af_xdp: use mbuf mempool for buffer management net/af_xdp: enable zero copy app/testpmd: add mempool flags parameter MAINTAINERS | 6 + app/test-pmd/parameters.c | 12 + app/test-pmd/testpmd.c | 17 +- app/test-pmd/testpmd.h | 1 + config/common_base | 5 + doc/guides/nics/af_xdp.rst | 43 + doc/guides/rel_notes/release_18_11.rst | 7 + drivers/net/Makefile | 1 + drivers/net/af_xdp/Makefile | 31 + drivers/net/af_xdp/meson.build | 7 + drivers/net/af_xdp/rte_eth_af_xdp.c | 988 ++++++++++++++++++ drivers/net/af_xdp/rte_pmd_af_xdp_version.map | 4 + lib/librte_mbuf/rte_mbuf.c | 15 +- lib/librte_mbuf/rte_mbuf.h | 8 +- lib/librte_mempool/rte_mempool.c | 3 + lib/librte_mempool/rte_mempool.h | 1 + mk/rte.app.mk | 1 + 17 files changed, 1139 insertions(+), 11 deletions(-) create mode 100644 doc/guides/nics/af_xdp.rst create mode 100644 drivers/net/af_xdp/Makefile create mode 100644 drivers/net/af_xdp/meson.build create mode 100644 drivers/net/af_xdp/rte_eth_af_xdp.c create mode 100644 drivers/net/af_xdp/rte_pmd_af_xdp_version.map -- 2.17.1