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bpf: net_sched: Support updating bstats

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Add a kfunc to update Qdisc bstats when an skb is dequeued. The kfunc is
only available in .dequeue programs.

Signed-off-by: Amery Hung <amery.hung@bytedance.com>
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
Acked-by: Toke Høiland-Jørgensen <toke@redhat.com>
Link: https://patch.msgid.link/20250409214606.2000194-6-ameryhung@gmail.com
This commit is contained in:
Amery Hung 2025-04-09 14:46:01 -07:00 committed by Martin KaFai Lau
parent 7a2dafda95
commit 544e0a1f1e
1 changed files with 11 additions and 0 deletions
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11
net/sched/bpf_qdisc.c
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@ -238,6 +238,15 @@ __bpf_kfunc void bpf_qdisc_reset_destroy_epilogue(struct Qdisc *sch)
qdisc_watchdog_cancel(&q->watchdog);
}
/* bpf_qdisc_bstats_update - Update Qdisc basic statistics
* @sch: The qdisc from which an skb is dequeued.
* @skb: The skb to be dequeued.
*/
__bpf_kfunc void bpf_qdisc_bstats_update(struct Qdisc *sch, const struct sk_buff *skb)
{
bstats_update(&sch->bstats, skb);
}
__bpf_kfunc_end_defs();
BTF_KFUNCS_START(qdisc_kfunc_ids)
@ -248,6 +257,7 @@ BTF_ID_FLAGS(func, bpf_dynptr_from_skb, KF_TRUSTED_ARGS)
BTF_ID_FLAGS(func, bpf_qdisc_watchdog_schedule, KF_TRUSTED_ARGS)
BTF_ID_FLAGS(func, bpf_qdisc_init_prologue, KF_TRUSTED_ARGS)
BTF_ID_FLAGS(func, bpf_qdisc_reset_destroy_epilogue, KF_TRUSTED_ARGS)
BTF_ID_FLAGS(func, bpf_qdisc_bstats_update, KF_TRUSTED_ARGS)
BTF_KFUNCS_END(qdisc_kfunc_ids)
BTF_SET_START(qdisc_common_kfunc_set)
@ -263,6 +273,7 @@ BTF_SET_END(qdisc_enqueue_kfunc_set)
BTF_SET_START(qdisc_dequeue_kfunc_set)
BTF_ID(func, bpf_qdisc_watchdog_schedule)
BTF_ID(func, bpf_qdisc_bstats_update)
BTF_SET_END(qdisc_dequeue_kfunc_set)
enum qdisc_ops_kf_flags {