RE: [PATCH bpf v2 00/11] bpf sockmap fixes

John Fastabend wrote:

Fixes for sockmap running against NGINX TCP tests and also on an
underprovisioned VM so that we hit error (ENOMEM) cases regularly.

The first 3 patches fix cases related to ENOMEM that were either
causing splats or data hangs.

Then 4-7 resolved cases found when running NGINX with its sockets
assigned to sockmap. These mostly have to do with handling fin/shutdown
incorrectly and ensuring epoll_wait works as expected.

Patches 8 and 9 extract some of the logic used for sockmap_listen tests
so that we can use it in other tests because it didn't make much
sense to me to add tests to the sockmap_listen cases when here we
are testing send/recv *basic* cases.

Finally patches 10 and 11 add the new tests to ensure we handle
ioctl(FIONREAD) and shutdown correctly.

To test the series I ran the NGINX compliance tests and the sockmap
selftests. For now our compliance test just runs with SK_PASS.

There are some more things to be done here, but these 11 patches
stand on their own in my opionion and fix issues we are having in
CI now. For bpf-next we can fixup/improve selftests to use the
ASSERT_* in sockmap_helpers, streamline some of the testing, and
add more tests. We also still are debugging a few additional flakes
patches coming soon.

v2: use skb_queue_empty instead of *_empty_lockless (Eric)
    oops incorrectly updated copied_seq on DROP case (Eric)
    added test for drop case copied_seq update

Sorry folks on the to line there I resent with the cc list here. I had
suppressed the CC list in the first batch.

.John