From b283e56faf06fbf470176f2aa17f19957756f611 Mon Sep 17 00:00:00 2001 From: Mathieu Desnoyers Date: Fri, 29 Jul 2022 15:37:43 -0400 Subject: [PATCH] fix: net: skb: introduce kfree_skb_reason() (v5.15.58..v5.16) See upstream commit : commit c504e5c2f9648a1e5c2be01e8c3f59d394192bd3 Author: Menglong Dong Date: Sun Jan 9 14:36:26 2022 +0800 net: skb: introduce kfree_skb_reason() Introduce the interface kfree_skb_reason(), which is able to pass the reason why the skb is dropped to 'kfree_skb' tracepoint. Add the 'reason' field to 'trace_kfree_skb', therefor user can get more detail information about abnormal skb with 'drop_monitor' or eBPF. All drop reasons are defined in the enum 'skb_drop_reason', and they will be print as string in 'kfree_skb' tracepoint in format of 'reason: XXX'. ( Maybe the reasons should be defined in a uapi header file, so that user space can use them? ) Signed-off-by: Mathieu Desnoyers Change-Id: Ib3c039207739dad10f097cf76474e0822e351273 --- instrumentation/events/lttng-module/skb.h | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/instrumentation/events/lttng-module/skb.h b/instrumentation/events/lttng-module/skb.h index 00495e75..6e363020 100644 --- a/instrumentation/events/lttng-module/skb.h +++ b/instrumentation/events/lttng-module/skb.h @@ -13,7 +13,9 @@ /* * Tracepoint for free an sk_buff: */ -#if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,17,0)) +#if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,17,0) \ + || LTTNG_KERNEL_RANGE(5,15,58, 5,16,0)) + LTTNG_TRACEPOINT_ENUM(skb_drop_reason, TP_ENUM_VALUES( ctf_enum_value("NOT_SPECIFIED", SKB_DROP_REASON_NOT_SPECIFIED) -- 2.34.1