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authorMenglong Dong <imagedong@tencent.com>2022-01-09 14:36:26 +0800
committerJakub Kicinski <kuba@kernel.org>2022-01-09 16:30:34 -0800
commitc504e5c2f9648a1e5c2be01e8c3f59d394192bd3 (patch)
tree7b0bfa659d35796ab251cccfc8ad6e9ed264df89 /include/trace
parent342402c426902c59491b43d3056a1039e5ca02db (diff)
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: Menglong Dong <imagedong@tencent.com> Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'include/trace')
-rw-r--r--include/trace/events/skb.h36
1 files changed, 29 insertions, 7 deletions
diff --git a/include/trace/events/skb.h b/include/trace/events/skb.h
index 9e92f22eb086..294c61bbe44b 100644
--- a/include/trace/events/skb.h
+++ b/include/trace/events/skb.h
@@ -9,29 +9,51 @@
#include <linux/netdevice.h>
#include <linux/tracepoint.h>
+#define TRACE_SKB_DROP_REASON \
+ EM(SKB_DROP_REASON_NOT_SPECIFIED, NOT_SPECIFIED) \
+ EMe(SKB_DROP_REASON_MAX, MAX)
+
+#undef EM
+#undef EMe
+
+#define EM(a, b) TRACE_DEFINE_ENUM(a);
+#define EMe(a, b) TRACE_DEFINE_ENUM(a);
+
+TRACE_SKB_DROP_REASON
+
+#undef EM
+#undef EMe
+#define EM(a, b) { a, #b },
+#define EMe(a, b) { a, #b }
+
/*
* Tracepoint for free an sk_buff:
*/
TRACE_EVENT(kfree_skb,
- TP_PROTO(struct sk_buff *skb, void *location),
+ TP_PROTO(struct sk_buff *skb, void *location,
+ enum skb_drop_reason reason),
- TP_ARGS(skb, location),
+ TP_ARGS(skb, location, reason),
TP_STRUCT__entry(
- __field( void *, skbaddr )
- __field( void *, location )
- __field( unsigned short, protocol )
+ __field(void *, skbaddr)
+ __field(void *, location)
+ __field(unsigned short, protocol)
+ __field(enum skb_drop_reason, reason)
),
TP_fast_assign(
__entry->skbaddr = skb;
__entry->location = location;
__entry->protocol = ntohs(skb->protocol);
+ __entry->reason = reason;
),
- TP_printk("skbaddr=%p protocol=%u location=%p",
- __entry->skbaddr, __entry->protocol, __entry->location)
+ TP_printk("skbaddr=%p protocol=%u location=%p reason: %s",
+ __entry->skbaddr, __entry->protocol, __entry->location,
+ __print_symbolic(__entry->reason,
+ TRACE_SKB_DROP_REASON))
);
TRACE_EVENT(consume_skb,