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| author |   Andrey Ignatov <rdna@fb.com> | 2020-05-13 18:50:27 -0700 |
|---|---|---|
| committer |   Alexei Starovoitov <ast@kernel.org> | 2020-05-14 18:30:57 -0700 |
| commit | 7aebfa1b3885b5aa29fcb4a596d0485ac463bbe8 (patch) | |
| tree | 63b1598db717838cec551892a04b6245c316539e /tools/testing/selftests/bpf/test_sock_addr.c | |
| parent | samples/bpf: xdp_redirect_cpu: Set MAX_CPUS according to NR_CPUS (diff) | |
| download | wireguard-linux-7aebfa1b3885b5aa29fcb4a596d0485ac463bbe8.tar.xz wireguard-linux-7aebfa1b3885b5aa29fcb4a596d0485ac463bbe8.zip | |
bpf: Support narrow loads from bpf_sock_addr.user_port
bpf_sock_addr.user_port supports only 4-byte load and it leads to ugly
code in BPF programs, like:
volatile __u32 user_port = ctx->user_port;
__u16 port = bpf_ntohs(user_port);
Since otherwise clang may optimize the load to be 2-byte and it's
rejected by verifier.
Add support for 1- and 2-byte loads same way as it's supported for other
fields in bpf_sock_addr like user_ip4, msg_src_ip4, etc.
Signed-off-by: Andrey Ignatov <rdna@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Yonghong Song <yhs@fb.com>
Link: https://lore.kernel.org/bpf/c1e983f4c17573032601d0b2b1f9d1274f24bc16.1589420814.git.rdna@fb.com
Diffstat (limited to '')
0 files changed, 0 insertions, 0 deletions