libbpf: Support getsockopt XDP_OPTIONS (2761ed4b) · Commits · 戴 / test

Query XDP_OPTIONS in libbpf to determine if the zero-copy mode is active or not. Signed-off-by:

tools/lib/bpf/xsk.c

+12 −0

Original line number	Diff line number	Diff line
		@@ -65,6 +65,7 @@ struct xsk_socket {
		int xsks_map_fd;
		__u32 queue_id;
		char ifname[IFNAMSIZ];
		bool zc;
		};

		struct xsk_nl_info {
		@@ -480,6 +481,7 @@ int xsk_socket__create(struct xsk_socket *xsk_ptr, const char ifname,
		void rx_map = NULL, tx_map = NULL;
		struct sockaddr_xdp sxdp = {};
		struct xdp_mmap_offsets off;
		struct xdp_options opts;
		struct xsk_socket *xsk;
		socklen_t optlen;
		int err;
		@@ -597,6 +599,16 @@ int xsk_socket__create(struct xsk_socket *xsk_ptr, const char ifname,
		}

		xsk->prog_fd = -1;

		optlen = sizeof(opts);
		err = getsockopt(xsk->fd, SOL_XDP, XDP_OPTIONS, &opts, &optlen);
		if (err) {
		err = -errno;
		goto out_mmap_tx;
		}

		xsk->zc = opts.flags & XDP_OPTIONS_ZEROCOPY;

		if (!(xsk->config.libbpf_flags & XSK_LIBBPF_FLAGS__INHIBIT_PROG_LOAD)) {
		err = xsk_setup_xdp_prog(xsk);
		if (err)