Merge branch 'Make 2-byte access to bpf_sk_lookup->remote_port endian-agnostic'

Merge branch 'Make 2-byte access to bpf_sk_lookup->remote_port endian-agnostic'

Jakub Sitnicki says:

====================

This patch set is a result of a discussion we had around the RFC patchset from
Ilya [1]. The fix for the narrow loads from the RFC series is still relevant,
but this series does not depend on it. Nor is it required to unbreak sk_lookup
tests on BE, if this series gets applied.

To summarize the takeaways from [1]:

 1) we want to make 2-byte load from ctx->remote_port portable across LE and BE,
 2) we keep the 4-byte load from ctx->remote_port as it is today - result varies
    on endianess of the platform.

[1] https://lore.kernel.org/bpf/20220222182559.2865596-2-iii@linux.ibm.com/

v1 -> v2:
- Remove needless check that 4-byte load is from &ctx->remote_port offset
  (Martin)

[v1]: https://lore.kernel.org/bpf/20220317165826.1099418-1-jakub@cloudflare.com/
====================

Signed-off-by: Alexei Starovoitov <ast@kernel.org>