[PATCH bpf-next v3 03/16] libbpf: Support getsockopt XDP_OPTIONS
From: Maxim Mikityanskiy <hidden>
Date: 2019-05-24 09:35:22
Also in:
bpf
Subsystem:
bpf [general] (safe dynamic programs and tools), bpf [library] (libbpf), the rest · Maintainers:
Alexei Starovoitov, Daniel Borkmann, Andrii Nakryiko, Eduard Zingerman, Kumar Kartikeya Dwivedi, Linus Torvalds
Query XDP_OPTIONS in libbpf to determine if the zero-copy mode is active or not. Signed-off-by: Maxim Mikityanskiy <redacted> Acked-by: Saeed Mahameed <redacted> --- tools/lib/bpf/xsk.c | 11 +++++++++++ 1 file changed, 11 insertions(+)
diff --git a/tools/lib/bpf/xsk.c b/tools/lib/bpf/xsk.c
index 38667b62f1fe..bedd747db81a 100644
--- a/tools/lib/bpf/xsk.c
+++ b/tools/lib/bpf/xsk.c@@ -67,6 +67,7 @@ struct xsk_socket { int xsks_map_fd; __u32 queue_id; char ifname[IFNAMSIZ]; + bool zc; }; struct xsk_nl_info {
@@ -527,6 +528,7 @@ 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;
@@ -646,6 +648,15 @@ int xsk_socket__create(struct xsk_socket **xsk_ptr, const char *ifname, xsk->qidconf_map_fd = -1; xsk->xsks_map_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)
--
2.19.1