netdev - [PATCH net v2 0/2] add drop reason when do fragment

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Message-Id: <1761301212-34487-1-git-send-email-liyonglong@chinatelecom.cn>
Date: Fri, 24 Oct 2025 18:20:10 +0800
From: Yonglong Li <liyonglong@...natelecom.cn>
To: netdev@...r.kernel.org
Cc: davem@...emloft.net,
	dsahern@...nel.org,
	edumazet@...gle.com,
	pabeni@...hat.com,
	kuba@...nel.org,
	horms@...nel.org,
	liyonglong@...natelecom.cn
Subject: [PATCH net v2 0/2] add drop reason when do fragment

Add two new drop reasons FRAG_FAILED, FRAG_OUTPUT_FAILED.
And use drop reasons to trace do fragment.


Reasons show up as:

perf record -e skb:kfree_skb -a; perf script

  swapper 0 [005] 154.086537: skb:kfree_skb: ... location=ip6_fragment reason: PKT_TOO_BIG
  swapper 0 [005] 154.086540: skb:kfree_skb: ... location=ip6_fragment reason: PKT_TOO_BIG
  swapper 0 [005] 154.086544: skb:kfree_skb: ... location=ip6_fragment reason: PKT_TOO_BIG

Yonglong Li (2):
  net: ip: add drop reasons when handling ip fragments
  net: ipv6: use drop reasons in ip6_fragment

 include/net/dropreason-core.h |  6 ++++++
 net/ipv4/ip_output.c          | 17 ++++++++++++-----
 net/ipv6/ip6_output.c         | 16 ++++++++++++----
 3 files changed, 30 insertions(+), 9 deletions(-)

-- 
1.8.3.1