selftests/bpf: Update sockopt_sk test to the use bpf_set_retval

Browse source

The tests would break without this patch, because at one point it calls
  getsockopt(fd, SOL_TCP, TCP_ZEROCOPY_RECEIVE, &buf, &optlen)
This getsockopt receives the kernel-set -EINVAL. Prior to this patch
series, the eBPF getsockopt hook's -EPERM would override kernel's
-EINVAL, however, after this patch series, return 0's automatic
-EPERM will not; the eBPF prog has to explicitly bpf_set_retval(-EPERM)
if that is wanted.

I also removed the explicit mentions of EPERM in the comments in the
prog.

Signed-off-by: YiFei Zhu <zhuyifei@google.com>
Reviewed-by: Stanislav Fomichev <sdf@google.com>
Link: https://lore.kernel.org/r/4f20b77cb46812dbc2bdcd7e3fa87c7573bde55e.1639619851.git.zhuyifei@google.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

...

This commit is contained in:

YiFei Zhu 2021-12-16 02:04:29 +00:00 • committed by Alexei Starovoitov

parent b8bff6f890

commit 1080ef5cc0

2 changed files with 18 additions and 18 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

4

tools/testing/selftests/bpf/prog_tests/sockopt_sk.c

View file

32

tools/testing/selftests/bpf/progs/sockopt_sk.c

View file