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[87.205.71.93]) by smtp.gmail.com with ESMTPSA id t26sm2667986lfp.296.2020.11.16.01.35.22 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 16 Nov 2020 01:35:23 -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 7/8] libbpf: add API to get XSK/XDP caps Date: Mon, 16 Nov 2020 10:34:51 +0100 Message-Id: <20201116093452.7541-8-marekx.majtyka@intel.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20201116093452.7541-1-marekx.majtyka@intel.com> References: <20201116093452.7541-1-marekx.majtyka@intel.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org From: Marek Majtyka Add public xsk API to read supported XDP functions of a netdev: - XDP driver mode (SKB, DRV), - XSK bind mode (COPY, ZEROCOPY). Signed-off-by: Marek Majtyka --- tools/lib/bpf/libbpf.map | 1 + tools/lib/bpf/xsk.c | 51 +++++++++++++++++++++++++++++++++++++++- tools/lib/bpf/xsk.h | 3 ++- 3 files changed, 53 insertions(+), 2 deletions(-) diff --git a/tools/lib/bpf/libbpf.map b/tools/lib/bpf/libbpf.map index 29ff4807b909..0867dd078a65 100644 --- a/tools/lib/bpf/libbpf.map +++ b/tools/lib/bpf/libbpf.map @@ -345,4 +345,5 @@ LIBBPF_0.3.0 { btf__parse_split; btf__new_empty_split; btf__new_split; + xsk_socket__get_caps; } LIBBPF_0.2.0; diff --git a/tools/lib/bpf/xsk.c b/tools/lib/bpf/xsk.c index 7951f7ea6db3..433c58fbed68 100644 --- a/tools/lib/bpf/xsk.c +++ b/tools/lib/bpf/xsk.c @@ -15,7 +15,6 @@ #include #include #include -#include #include #include #include @@ -31,6 +30,7 @@ #include #include "bpf.h" +#include "ethtool.h" #include "libbpf.h" #include "libbpf_internal.h" #include "xsk.h" @@ -931,3 +931,52 @@ void xsk_socket__delete(struct xsk_socket *xsk) close(xsk->fd); free(xsk); } + +int xsk_socket__get_caps(const char *ifname, __u32 *xdp_caps, __u16 *bind_caps) +{ + struct ethnl_params param; + int ret; + + if (!xdp_caps || !bind_caps || !ifname || + (strnlen(ifname, IFNAMSIZ) >= IFNAMSIZ)) + return -EINVAL; + + param.nl_family = ETHTOOL_GENL_NAME; + param.xdp_zc_flags = 0; + param.ifname = ifname; + param.xdp_flags = 0; + + /* First, get the netlink family id */ + ret = libbpf_ethnl_get_ethtool_family_id(¶m); + if (ret) + return ret; + + /* Second, get number of features */ + param.features = 0; + ret = libbpf_ethnl_get_netdev_features(¶m); + if (ret) + return ret; + + /* Third, get the features description */ + ret = libbpf_ethnl_get_netdev_features(¶m); + if (ret) + return ret; + + *xdp_caps = XDP_FLAGS_SKB_MODE; + *bind_caps = XDP_COPY; + + if (param.xdp_idx == -1 || param.xdp_zc_idx == -1) + return 0; + + /* Finally, get features flags and process it */ + ret = libbpf_ethnl_get_active_bits(¶m); + if (!ret) { + if (param.xdp_flags) { + *xdp_caps |= XDP_FLAGS_DRV_MODE; + if (param.xdp_zc_flags) + *bind_caps |= XDP_ZEROCOPY; + } + } + + return ret; +} diff --git a/tools/lib/bpf/xsk.h b/tools/lib/bpf/xsk.h index 1069c46364ff..ae29004570b2 100644 --- a/tools/lib/bpf/xsk.h +++ b/tools/lib/bpf/xsk.h @@ -247,7 +247,8 @@ xsk_socket__create_shared(struct xsk_socket **xsk_ptr, /* Returns 0 for success and -EBUSY if the umem is still in use. */ LIBBPF_API int xsk_umem__delete(struct xsk_umem *umem); LIBBPF_API void xsk_socket__delete(struct xsk_socket *xsk); - +LIBBPF_API int xsk_socket__get_caps(const char *ifname, __u32 *xdp_caps, + __u16 *bind_caps); #ifdef __cplusplus } /* extern "C" */ #endif