From: "Toke Høiland-Jørgensen" <toke@redhat.com>
To: Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
netdev@vger.kernel.org, bpf@vger.kernel.org
Cc: "Toke Høiland-Jørgensen" <toke@redhat.com>
Subject: [PATCH] libbpf: Don't error out if getsockopt() fails for XDP_OPTIONS
Date: Mon, 9 Sep 2019 18:46:19 +0100 [thread overview]
Message-ID: <20190909174619.1735-1-toke@redhat.com> (raw)
The xsk_socket__create() function fails and returns an error if it cannot
get the XDP_OPTIONS through getsockopt(). However, support for XDP_OPTIONS
was not added until kernel 5.3, so this means that creating XSK sockets
always fails on older kernels.
Since the option is just used to set the zero-copy flag in the xsk struct,
there really is no need to error out if the getsockopt() call fails.
Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com>
---
tools/lib/bpf/xsk.c | 8 ++------
1 file changed, 2 insertions(+), 6 deletions(-)
diff --git a/tools/lib/bpf/xsk.c b/tools/lib/bpf/xsk.c
index 680e63066cf3..598e487d9ce8 100644
--- a/tools/lib/bpf/xsk.c
+++ b/tools/lib/bpf/xsk.c
@@ -603,12 +603,8 @@ int xsk_socket__create(struct xsk_socket **xsk_ptr, const char *ifname,
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 (!err)
+ xsk->zc = opts.flags & XDP_OPTIONS_ZEROCOPY;
if (!(xsk->config.libbpf_flags & XSK_LIBBPF_FLAGS__INHIBIT_PROG_LOAD)) {
err = xsk_setup_xdp_prog(xsk);
--
2.23.0
next reply other threads:[~2019-09-09 17:46 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-09 17:46 Toke Høiland-Jørgensen [this message]
2019-09-09 17:53 ` [PATCH] libbpf: Don't error out if getsockopt() fails for XDP_OPTIONS Yonghong Song
2019-09-09 23:06 ` Toke Høiland-Jørgensen
2019-09-13 18:53 ` Yonghong Song
2019-09-16 5:09 ` Björn Töpel
2019-09-16 8:08 ` Daniel Borkmann
2019-09-16 12:31 ` Toke Høiland-Jørgensen
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