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Date: Tue, 4 Jan 2022 11:21:31 +0800 From: menglong8.dong@...il.com To: rostedt@...dmis.org, kuba@...nel.org, dsahern@...nel.org Cc: mingo@...hat.com, davem@...emloft.net, nhorman@...driver.com, edumazet@...gle.com, yoshfuji@...ux-ipv6.org, jonathan.lemon@...il.com, alobakin@...me, keescook@...omium.org, cong.wang@...edance.com, talalahmad@...gle.com, haokexin@...il.com, imagedong@...cent.com, atenart@...nel.org, bigeasy@...utronix.de, weiwan@...gle.com, arnd@...db.de, pabeni@...hat.com, vvs@...tuozzo.com, linux-kernel@...r.kernel.org, netdev@...r.kernel.org, mengensun@...cent.com, mungerjiang@...cent.com Subject: [PATCH v3 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 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: skb: introduce kfree_skb_reason() net: skb: use kfree_skb_reason() in tcp_v4_rcv() net: skb: use kfree_skb_reason() in __udp4_lib_rcv() include/linux/skbuff.h | 28 +++++++++++++++++++++++++- include/trace/events/skb.h | 40 +++++++++++++++++++++++++++++++------- net/core/dev.c | 3 ++- net/core/drop_monitor.c | 10 +++++++--- net/core/skbuff.c | 12 +++++++----- net/ipv4/tcp_ipv4.c | 14 ++++++++++--- net/ipv4/udp.c | 10 ++++++++-- 7 files changed, 95 insertions(+), 22 deletions(-) -- 2.27.0
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