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authorQitao Xu <qitao.xu@bytedance.com>2021-07-14 23:03:24 -0700
committerDavid S. Miller <davem@davemloft.net>2021-07-15 10:32:38 -0700
commit70713dddf3d25a02d1952f8c5d2688c986d2f2fb (patch)
tree31d54d7e6bef0ca4e69b4e09ee3c34ea050ede7d /scripts/bin2c.c
parent851f36e40962408309ad2665bf0056c19a97881c (diff)
net_sched: introduce tracepoint trace_qdisc_enqueue()
Tracepoint trace_qdisc_enqueue() is introduced to trace skb at the entrance of TC layer on TX side. This is similar to trace_qdisc_dequeue(): 1. For both we only trace successful cases. The failure cases can be traced via trace_kfree_skb(). 2. They are called at entrance or exit of TC layer, not for each ->enqueue() or ->dequeue(). This is intentional, because we want to make trace_qdisc_enqueue() symmetric to trace_qdisc_dequeue(), which is easier to use. The return value of qdisc_enqueue() is not interesting here, we have Qdisc's drop packets in ->dequeue(), it is impossible to trace them even if we have the return value, the only way to trace them is tracing kfree_skb(). We only add information we need to trace ring buffer. If any other information is needed, it is easy to extend it without breaking ABI, see commit 3dd344ea84e1 ("net: tracepoint: exposing sk_family in all tcp:tracepoints"). Reviewed-by: Cong Wang <cong.wang@bytedance.com> Signed-off-by: Qitao Xu <qitao.xu@bytedance.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'scripts/bin2c.c')
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