netdev - [PATCH bpf v3 0/3] bpf, sockmap complete fixes for avail bytes

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Message-Id: <20230926035300.135096-1-john.fastabend@gmail.com>
Date: Mon, 25 Sep 2023 20:52:57 -0700
From: John Fastabend <john.fastabend@...il.com>
To: daniel@...earbox.net,
	ast@...nel.org,
	andrii@...nel.org,
	jakub@...udflare.com
Cc: john.fastabend@...il.com,
	bpf@...r.kernel.org,
	netdev@...r.kernel.org,
	edumazet@...gle.com
Subject: [PATCH bpf v3 0/3] bpf, sockmap complete fixes for avail bytes

With e5c6de5fa0258 ("bpf, sockmap: Incorrectly handling copied_seq") we
started fixing the available bytes accounting by moving copied_seq to
where the user actually reads the bytes.

However we missed handling MSG_PEEK correctly and we need to ensure
that we don't kfree_skb() a skb off the receive_queue when the
copied_seq number is not incremented by user reads for some time.

v2: drop seq var in tcp_read_skb its no longer necessary per Jakub's
    suggestion
v3: drop tcp_sock as well its also not used anymore. sorry for the extra
    noise there.

John Fastabend (3):
  bpf: tcp_read_skb needs to pop skb regardless of seq
  bpf: sockmap, do not inc copied_seq when PEEK flag set
  bpf: sockmap, add tests for MSG_F_PEEK

 net/ipv4/tcp.c                                | 10 +---
 net/ipv4/tcp_bpf.c                            |  4 +-
 .../selftests/bpf/prog_tests/sockmap_basic.c  | 52 +++++++++++++++++++
 3 files changed, 57 insertions(+), 9 deletions(-)

-- 
2.33.0