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[87.205.71.93]) by smtp.gmail.com with ESMTPSA id t26sm2667986lfp.296.2020.11.16.01.35.08 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 16 Nov 2020 01:35:10 -0800 (PST) From: alardam@gmail.com X-Google-Original-From: marekx.majtyka@intel.com To: magnus.karlsson@intel.com, bjorn.topel@intel.com, andrii.nakryiko@gmail.com, kuba@kernel.org, ast@kernel.org, daniel@iogearbox.net, netdev@vger.kernel.org, davem@davemloft.net, john.fastabend@gmail.com, hawk@kernel.org, toke@redhat.com Cc: maciej.fijalkowski@intel.com, jonathan.lemon@gmail.com, bpf@vger.kernel.org, jeffrey.t.kirsher@intel.com, maciejromanfijalkowski@gmail.com, intel-wired-lan@lists.osuosl.org, Marek Majtyka Subject: [PATCH 0/8] New netdev feature flags for XDP Date: Mon, 16 Nov 2020 10:34:44 +0100 Message-Id: <20201116093452.7541-1-marekx.majtyka@intel.com> X-Mailer: git-send-email 2.20.1 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org From: Marek Majtyka Implement support for checking if a netdev has native XDP and AF_XDP zero copy support. Previously, there was no way to do this other than to try to create an AF_XDP socket on the interface or load an XDP program and see if it worked. This commit changes this by extending existing netdev_features in the following way: * xdp - full XDP support (XDP_{TX, PASS, DROP, ABORT, REDIRECT}) * af-xdp-zc - AF_XDP zero copy support NICs supporting these features are updated by turning the corresponding netdev feature flags on. NOTE: Only the compilation check was performed for: - ice, - igb, - mlx5, - bnxt, - dpaa2, - mvmeta, - mvpp2, - qede, - sfc, - netsec, - cpsw, - xen, - virtio_net. Libbpf library is extended in order to provide a simple API for gathering information about XDP supported capabilities of a netdev. This API utilizes netlink interface towards kernel. With this function it is possible to get xsk supported options for netdev beforehand. The new API is used in core xsk code as well as in the xdpsock sample. These new flags also solve the problem with strict recognition of zero copy support. The problem is that there are drivers out there that only support XDP partially, so it is possible to successfully load the XDP program in native mode, but it will still not be able to support zero-copy as it does not have XDP_REDIRECT support. With af-xdp-zc flag the check is possible and trivial. Marek Majtyka (8): net: ethtool: extend netdev_features flag set drivers/net: turn XDP flags on xsk: add usage of xdp netdev_features flags xsk: add check for full support of XDP in bind libbpf: extend netlink attribute API libbpf: add functions to get XSK modes libbpf: add API to get XSK/XDP caps samples/bpf/xdp: apply netdev XDP/XSK modes info drivers/net/ethernet/broadcom/bnxt/bnxt.c | 1 + .../net/ethernet/freescale/dpaa2/dpaa2-eth.c | 1 + drivers/net/ethernet/intel/i40e/i40e_main.c | 2 + drivers/net/ethernet/intel/ice/ice_main.c | 4 + drivers/net/ethernet/intel/igb/igb_main.c | 2 + drivers/net/ethernet/intel/ixgbe/ixgbe_main.c | 3 + drivers/net/ethernet/marvell/mvneta.c | 1 + .../net/ethernet/marvell/mvpp2/mvpp2_main.c | 1 + .../net/ethernet/mellanox/mlx5/core/en_main.c | 2 + drivers/net/ethernet/qlogic/qede/qede_main.c | 1 + drivers/net/ethernet/sfc/efx.c | 1 + drivers/net/ethernet/socionext/netsec.c | 1 + drivers/net/ethernet/ti/cpsw.c | 2 + drivers/net/ethernet/ti/cpsw_new.c | 2 + drivers/net/tun.c | 4 + drivers/net/veth.c | 1 + drivers/net/virtio_net.c | 1 + drivers/net/xen-netfront.c | 1 + include/linux/netdev_features.h | 6 + include/net/xdp.h | 13 + include/net/xdp_sock_drv.h | 11 + include/uapi/linux/if_xdp.h | 1 + net/ethtool/common.c | 2 + net/xdp/xsk.c | 4 +- net/xdp/xsk_buff_pool.c | 21 +- samples/bpf/xdpsock_user.c | 117 +++++- tools/include/uapi/linux/ethtool.h | 44 ++ tools/include/uapi/linux/if_xdp.h | 1 + tools/lib/bpf/ethtool.h | 49 +++ tools/lib/bpf/libbpf.h | 1 + tools/lib/bpf/libbpf.map | 1 + tools/lib/bpf/netlink.c | 379 +++++++++++++++++- tools/lib/bpf/nlattr.c | 105 +++++ tools/lib/bpf/nlattr.h | 22 + tools/lib/bpf/xsk.c | 54 ++- tools/lib/bpf/xsk.h | 3 +- 36 files changed, 845 insertions(+), 20 deletions(-) create mode 100644 tools/lib/bpf/ethtool.h