netdev - [PATCH bpf-next 0/3] sockmap/ktls: Simplify how we restore sk

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Date:   Mon, 17 Feb 2020 12:15:27 +0000
From:   Jakub Sitnicki <jakub@...udflare.com>
To:     bpf@...r.kernel.org
Cc:     netdev@...r.kernel.org, kernel-team@...udflare.com,
        Daniel Borkmann <daniel@...earbox.net>,
        John Fastabend <john.fastabend@...il.com>
Subject: [PATCH bpf-next 0/3] sockmap/ktls: Simplify how we restore sk_prot callbacks

This series has been split out from "Extend SOCKMAP to store listening
sockets" [0]. I think it stands on its own, and makes the latter series
smaller, which will make the review easier, hopefully.

The essence is that we don't need to do a complicated dance in
sk_psock_restore_proto, if we agree that the contract with tcp_update_ulp
is to restore callbacks even when the socket doesn't use ULP. This is what
tcp_update_ulp currently does, and we just make use of it.

Series is accompanied by a test for a particularly tricky case of restoring
callbacks when we have both sockmap and tls callbacks configured in
sk->sk_prot.

[0] https://lore.kernel.org/bpf/20200127131057.150941-1-jakub@cloudflare.com/

Jakub Sitnicki (3):
  bpf, sk_msg: Let ULP restore sk_proto and write_space callback
  bpf, sk_msg: Don't clear saved sock proto on restore
  selftests/bpf: Test unhashing kTLS socket after removing from map

 include/linux/skmsg.h                         |  17 +--
 .../selftests/bpf/prog_tests/sockmap_ktls.c   | 123 ++++++++++++++++++
 2 files changed, 124 insertions(+), 16 deletions(-)
 create mode 100644 tools/testing/selftests/bpf/prog_tests/sockmap_ktls.c

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2.24.1