[bpf-next PATCH v2 0/3] Hash support for sock

[John Fastabend <john.fastabend@gmail.com>]

In the original sockmap implementation we got away with using an
array similar to devmap. However, unlike devmap where an ifindex
has a nice 1:1 function into the map we have found some use cases
with sockets that need to be referenced using longer keys.

This series adds support for a sockhash map reusing as much of
the sockmap code as possible. I made the decision to add sockhash
specific helpers vs trying to generalize the existing helpers
because (a) they have sockmap in the name and (b) the keys are
different types. I prefer to be explicit here rather than play
type games or do something else tricky.

To test this we duplicate all the sockmap testing except swap out
the sockmap with a sockhash.

v2: fix file stats and add v2 tag

---

John Fastabend (3):
      bpf: sockmap, refactor sockmap routines to work with hashmap
      bpf: sockmap, add hash map support
      bpf: selftest additions for SOCKHASH


 include/linux/bpf.h                              |    8 
 include/linux/bpf_types.h                        |    1 
 include/linux/filter.h                           |    3 
 include/net/tcp.h                                |    3 
 include/uapi/linux/bpf.h                         |    6 
 kernel/bpf/core.c                                |    1 
 kernel/bpf/sockmap.c                             |  638 +++++++++++++++++++---
 kernel/bpf/verifier.c                            |   14 
 net/core/filter.c                                |   89 ++-
 tools/bpf/bpftool/map.c                          |    1 
 tools/include/uapi/linux/bpf.h                   |    6 
 tools/testing/selftests/bpf/Makefile             |    3 
 tools/testing/selftests/bpf/test_sockhash_kern.c |    4 
 tools/testing/selftests/bpf/test_sockmap.c       |   27 +
 tools/testing/selftests/bpf/test_sockmap_kern.c  |  340 ------------
 tools/testing/selftests/bpf/test_sockmap_kern.h  |  340 ++++++++++++
 16 files changed, 1034 insertions(+), 450 deletions(-)
 create mode 100644 tools/testing/selftests/bpf/test_sockhash_kern.c
 create mode 100644 tools/testing/selftests/bpf/test_sockmap_kern.h