netdev - [Patch bpf v3 0/8] sock_map: some bug fixes and improvements

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Message-Id: <20210527011155.10097-1-xiyou.wangcong@gmail.com>
Date:   Wed, 26 May 2021 18:11:47 -0700
From:   Cong Wang <xiyou.wangcong@...il.com>
To:     netdev@...r.kernel.org
Cc:     bpf@...r.kernel.org, Cong Wang <cong.wang@...edance.com>
Subject: [Patch bpf v3 0/8] sock_map: some bug fixes and improvements

From: Cong Wang <cong.wang@...edance.com>

This patchset contains a few bug fixes and improvements for sock_map.

Patch 1 improves recvmsg() accuracy for UDP, patch 2 improves UDP
non-blocking read() by retrying on EAGAIN. With both of them, the
failure rate of the UDP test case goes down from 10% to 1%.

Patch 3 is memory leak fix I posted, no change since v1. The rest
patches address similar memory leaks or improve error handling,
including one increases sk_drops counter for error cases. Please
check each patch description for more details.

---
v3: add another bug fix as patch 4
    update patch 5 accordingly
    address John's review on the last patch
    fix a few typos in patch descriptions

v2: group all patches together
    set max for retries of EAGAIN

Cong Wang (8):
  skmsg: improve udp_bpf_recvmsg() accuracy
  selftests/bpf: Retry for EAGAIN in udp_redir_to_connected()
  udp: fix a memory leak in udp_read_sock()
  skmsg: clear skb redirect pointer before dropping it
  skmsg: fix a memory leak in sk_psock_verdict_apply()
  skmsg: teach sk_psock_verdict_apply() to return errors
  skmsg: pass source psock to sk_psock_skb_redirect()
  skmsg: increase sk->sk_drops when dropping packets

 include/linux/skmsg.h                         |  2 -
 net/core/skmsg.c                              | 82 +++++++++----------
 net/ipv4/tcp_bpf.c                            | 24 +++++-
 net/ipv4/udp.c                                |  2 +
 net/ipv4/udp_bpf.c                            | 47 +++++++++--
 .../selftests/bpf/prog_tests/sockmap_listen.c |  7 +-
 6 files changed, 112 insertions(+), 52 deletions(-)

-- 
2.25.1