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bpf: net_sched: Support implementation of Qdisc_ops in bpf

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The recent advancement in bpf such as allocated objects, bpf list and bpf
rbtree has provided powerful and flexible building blocks to realize
sophisticated packet scheduling algorithms. As struct_ops now supports
core operators in Qdisc_ops, start allowing qdisc to be implemented using
bpf struct_ops with this patch. Users can implement Qdisc_ops.{enqueue,
dequeue, init, reset, destroy} in bpf and register the qdisc dynamically
into the kernel.

Co-developed-by: Cong Wang <cong.wang@bytedance.com>
Signed-off-by: Cong Wang <cong.wang@bytedance.com>
Signed-off-by: Amery Hung <amery.hung@bytedance.com>
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
Acked-by: Cong Wang <xiyou.wangcong@gmail.com>
Acked-by: Toke Høiland-Jørgensen <toke@redhat.com>
Link: https://patch.msgid.link/20250409214606.2000194-3-ameryhung@gmail.com
This commit is contained in:
Amery Hung
2025-04-09 14:45:58 -07:00
committed by Martin KaFai Lau
parent a1b669ea16
commit c824034495
5 changed files with 235 additions and 4 deletions
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3
net/sched/sch_generic.c
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@@ -24,6 +24,7 @@
#include <linux/if_vlan.h>
#include <linux/skb_array.h>
#include <linux/if_macvlan.h>
#include <linux/bpf.h>
#include <net/sch_generic.h>
#include <net/pkt_sched.h>
#include <net/dst.h>
@@ -1078,7 +1079,7 @@ static void __qdisc_destroy(struct Qdisc *qdisc)
ops->destroy(qdisc);
lockdep_unregister_key(&qdisc->root_lock_key);
module_put(ops->owner);
bpf_module_put(ops, ops->owner);
netdev_put(dev, &qdisc->dev_tracker);
trace_qdisc_destroy(qdisc);