linux-kernel - [PATCH v4 net-next 0/3] net: skb: introduce kfree_skb_with

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Date:   Sun,  9 Jan 2022 14:36:25 +0800
From:   menglong8.dong@...il.com
To:     rostedt@...dmis.org, dsahern@...nel.org
Cc:     mingo@...hat.com, davem@...emloft.net, kuba@...nel.org,
        nhorman@...driver.com, edumazet@...gle.com,
        yoshfuji@...ux-ipv6.org, alobakin@...me, willemb@...gle.com,
        cong.wang@...edance.com, keescook@...omium.org, pabeni@...hat.com,
        talalahmad@...gle.com, haokexin@...il.com,
        ilias.apalodimas@...aro.org, memxor@...il.com, atenart@...nel.org,
        bigeasy@...utronix.de, weiwan@...gle.com, arnd@...db.de,
        vvs@...tuozzo.com, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, jonathan.lemon@...il.com,
        imagedong@...cent.com
Subject: [PATCH v4 net-next 0/3] net: skb: introduce kfree_skb_with_reason()

From: Menglong Dong <imagedong@...cent.com>

In this series patch, the interface kfree_skb_with_reason() is
introduced(), which is used to collect skb drop reason, and pass
it to 'kfree_skb' tracepoint. Therefor, 'drop_monitor' or eBPF is
able to monitor abnormal skb with detail reason.

In fact, this series patches are out of the intelligence of David
and Steve, I'm just a truck man :/

Previous discussion is here:

https://lore.kernel.org/netdev/20211118105752.1d46e990@gandalf.local.home/
https://lore.kernel.org/netdev/67b36bd8-2477-88ac-83a0-35a1eeaf40c9@gmail.com/

In the first patch, kfree_skb_with_reason() is introduced and
the 'reason' field is added to 'kfree_skb' tracepoint. In the
second patch, 'kfree_skb()' in replaced with 'kfree_skb_with_reason()'
in tcp_v4_rcv(). In the third patch, 'kfree_skb_with_reason()' is
used in __udp4_lib_rcv().

Changes since v3:
- fix some code style problems in skb.h

Changes since v2:
- rename kfree_skb_with_reason() to kfree_skb_reason()
- make kfree_skb() static inline, as Jakub suggested

Changes since v1:
- rename some drop reason, as David suggested
- add the third patch


Menglong Dong (3):
  net: bpf: handle return value of 
    BPF_CGROUP_RUN_PROG_INET{4,6}_POST_BIND()
  bpf: selftests: use C99 initializers in test_sock.c
  bpf: selftests: add bind retry for post_bind{4, 6}

 include/net/sock.h                      |   1 +
 net/ipv4/af_inet.c                      |   2 +
 net/ipv4/ping.c                         |   1 +
 net/ipv4/tcp_ipv4.c                     |   1 +
 net/ipv4/udp.c                          |   1 +
 net/ipv6/af_inet6.c                     |   2 +
 net/ipv6/ping.c                         |   1 +
 net/ipv6/tcp_ipv6.c                     |   1 +
 net/ipv6/udp.c                          |   1 +
 tools/testing/selftests/bpf/test_sock.c | 370 ++++++++++++++----------
 10 files changed, 233 insertions(+), 148 deletions(-)

-- 
2.27.0