From:   menglong8.dong@gmail.com
To:     rostedt@goodmis.org, dsahern@kernel.org
Cc:     mingo@redhat.com, davem@davemloft.net, kuba@kernel.org,
        nhorman@tuxdriver.com, edumazet@google.com,
        yoshfuji@linux-ipv6.org, jonathan.lemon@gmail.com, alobakin@pm.me,
        keescook@chromium.org, pabeni@redhat.com, talalahmad@google.com,
        haokexin@gmail.com, imagedong@tencent.com, atenart@kernel.org,
        bigeasy@linutronix.de, weiwan@google.com, arnd@arndb.de,
        vvs@virtuozzo.com, cong.wang@bytedance.com,
        linux-kernel@vger.kernel.org, netdev@vger.kernel.org,
        mengensun@tencent.com, mungerjiang@tencent.com
Subject: [PATCH v2 net-next 0/3] net: skb: introduce kfree_skb_with_reason() and use it for tcp and udp
Date:   Thu, 30 Dec 2021 17:32:37 +0800
Message-Id: <20211230093240.1125937-1-imagedong@tencent.com>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

From: Menglong Dong <imagedong@tencent.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 v1:
- rename some drop reason, as David suggested
- add the third patch


Menglong Dong (3):
  net: skb: introduce kfree_skb_with_reason()
  net: skb: use kfree_skb_with_reason() in tcp_v4_rcv()
  net: skb: use kfree_skb_with_reason() in __udp4_lib_rcv()

 include/linux/skbuff.h     | 18 +++++++++++++++++
 include/trace/events/skb.h | 41 +++++++++++++++++++++++++++++++-------
 net/core/dev.c             |  3 ++-
 net/core/drop_monitor.c    | 10 +++++++---
 net/core/skbuff.c          | 22 +++++++++++++++++++-
 net/ipv4/tcp_ipv4.c        | 14 ++++++++++---
 net/ipv4/udp.c             | 10 ++++++++--
 7 files changed, 101 insertions(+), 17 deletions(-)

-- 
2.27.0