Introduce a new Qdisc which is completely managed by eBPF program
of type BPF_PROG_TYPE_QDISC. It accepts two eBPF programs of
the same type, but one for enqueue and the other for dequeue.
And it interacts with Qdisc layer in two ways:
1) It relies on Qdisc watchdog to handle throttling;
2) It could pass the skb enqueue/dequeue down to child classes
The context of this eBPF program is different, as shown below:
┌──────────┬───────────────┬─────────────────────────────────┐
│ │ │ │
│ prog │ input │ output │
│ │ │ │
├──────────┼───────────────┼─────────────────────────────────┤
│ │ ctx->skb │ SCH_BPF_THROTTLE: ctx->delay │
│ │ │ │
│ enqueue │ ctx->classid │ SCH_BPF_QUEUED: None │
│ │ │ │
│ │ │ SCH_BPF_DROP: None │
│ │ │ │
│ │ │ SCH_BPF_CN: None │
│ │ │ │
│ │ │ SCH_BPF_PASS: ctx->classid │
├──────────┼───────────────┼─────────────────────────────────┤
│ │ │ SCH_BPF_THROTTLE: ctx->delay │
│ │ │ │
│ dequeue │ ctx->classid │ SCH_BPF_DEQUEUED: ctx->skb │
│ │ │ │
│ │ │ SCH_BPF_DROP: None │
│ │ │ │
│ │ │ SCH_BPF_PASS: ctx->classid │
└──────────┴───────────────┴─────────────────────────────────┘
Signed-off-by: Cong Wang <cong.wang@xxxxxxxxxxxxx>
---
include/linux/bpf_types.h | 2 +
include/uapi/linux/bpf.h | 16 ++
include/uapi/linux/pkt_sched.h | 17 ++
net/core/filter.c | 12 +
net/sched/Kconfig | 15 +
net/sched/Makefile | 1 +
net/sched/sch_bpf.c | 485 +++++++++++++++++++++++++++++++++
7 files changed, 548 insertions(+)
create mode 100644 net/sched/sch_bpf.c
diff --git a/include/linux/bpf_types.h b/include/linux/bpf_types.h
index d1ef13b08e28..4e375abe0f03 100644
--- a/include/linux/bpf_types.h
+++ b/include/linux/bpf_types.h
@@ -8,6 +8,8 @@ BPF_PROG_TYPE(BPF_PROG_TYPE_SCHED_CLS, tc_cls_act,
struct __sk_buff, struct sk_buff)
BPF_PROG_TYPE(BPF_PROG_TYPE_SCHED_ACT, tc_cls_act,
struct __sk_buff, struct sk_buff)
+BPF_PROG_TYPE(BPF_PROG_TYPE_QDISC, tc_qdisc,
+ struct __sk_buff, struct sk_buff)
BPF_PROG_TYPE(BPF_PROG_TYPE_XDP, xdp,
struct xdp_md, struct xdp_buff)
#ifdef CONFIG_CGROUP_BPF
diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h
index 994a3e42a4fa..c21fd1f189bc 100644
--- a/include/uapi/linux/bpf.h
+++ b/include/uapi/linux/bpf.h
@@ -980,6 +980,7 @@ enum bpf_prog_type {
BPF_PROG_TYPE_LSM,
BPF_PROG_TYPE_SK_LOOKUP,
BPF_PROG_TYPE_SYSCALL, /* a program that can execute syscalls */
+ BPF_PROG_TYPE_QDISC,
};
enum bpf_attach_type {
@@ -6984,4 +6985,19 @@ struct bpf_core_relo {
enum bpf_core_relo_kind kind;
};
+struct sch_bpf_ctx {
+ struct __sk_buff *skb;
+ __u32 classid;
+ __u64 delay;
+};
+
+enum {
+ SCH_BPF_QUEUED,
+ SCH_BPF_DEQUEUED = SCH_BPF_QUEUED,
+ SCH_BPF_DROP,
+ SCH_BPF_CN,
+ SCH_BPF_THROTTLE,
+ SCH_BPF_PASS,
+};
+
#endif /* _UAPI__LINUX_BPF_H__ */
diff --git a/include/uapi/linux/pkt_sched.h b/include/uapi/linux/pkt_sched.h
index 000eec106856..229af4cc54f6 100644
--- a/include/uapi/linux/pkt_sched.h
+++ b/include/uapi/linux/pkt_sched.h
@@ -1278,4 +1278,21 @@ enum {
#define TCA_ETS_MAX (__TCA_ETS_MAX - 1)
+#define TCA_SCH_BPF_FLAG_DIRECT _BITUL(0)
+enum {
+ TCA_SCH_BPF_UNSPEC,
+ TCA_SCH_BPF_FLAGS, /* u32 */
+ TCA_SCH_BPF_ENQUEUE_PROG_NAME, /* string */
+ TCA_SCH_BPF_ENQUEUE_PROG_FD, /* u32 */
+ TCA_SCH_BPF_ENQUEUE_PROG_ID, /* u32 */
+ TCA_SCH_BPF_ENQUEUE_PROG_TAG, /* data */
+ TCA_SCH_BPF_DEQUEUE_PROG_NAME, /* string */
+ TCA_SCH_BPF_DEQUEUE_PROG_FD, /* u32 */
+ TCA_SCH_BPF_DEQUEUE_PROG_ID, /* u32 */
+ TCA_SCH_BPF_DEQUEUE_PROG_TAG, /* data */
+ __TCA_SCH_BPF_MAX,
+};
+
+#define TCA_SCH_BPF_MAX (__TCA_SCH_BPF_MAX - 1)
+
#endif
diff --git a/net/core/filter.c b/net/core/filter.c
index bb0136e7a8e4..7a271b77a2cc 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -10655,6 +10655,18 @@ const struct bpf_prog_ops tc_cls_act_prog_ops = {
.test_run = bpf_prog_test_run_skb,
};
+const struct bpf_verifier_ops tc_qdisc_verifier_ops = {
+ .get_func_proto = tc_cls_act_func_proto,
+ .is_valid_access = tc_cls_act_is_valid_access,
+ .convert_ctx_access = tc_cls_act_convert_ctx_access,
+ .gen_prologue = tc_cls_act_prologue,
+ .gen_ld_abs = bpf_gen_ld_abs,
+};
+
+const struct bpf_prog_ops tc_qdisc_prog_ops = {
+ .test_run = bpf_prog_test_run_skb,
+};
+
const struct bpf_verifier_ops xdp_verifier_ops = {
.get_func_proto = xdp_func_proto,
.is_valid_access = xdp_is_valid_access,
diff --git a/net/sched/Kconfig b/net/sched/Kconfig
index 1e8ab4749c6c..19f68aac79b1 100644
--- a/net/sched/Kconfig
+++ b/net/sched/Kconfig
@@ -439,6 +439,21 @@ config NET_SCH_ETS
If unsure, say N.
+config NET_SCH_BPF
+ tristate "eBPF based programmable queue discipline"
+ help
+ This eBPF based queue discipline offers a way to program your
+ own packet scheduling algorithm. This is a classful qdisc which
+ also allows you to decide the hierarchy.
+
+ Say Y here if you want to use the eBPF based programmable queue
+ discipline.
+
+ To compile this driver as a module, choose M here: the module
+ will be called sch_bpf.
+
+ If unsure, say N.
+
menuconfig NET_SCH_DEFAULT
bool "Allow override default queue discipline"
help
diff --git a/net/sched/Makefile b/net/sched/Makefile
index dd14ef413fda..9ef0d579f5ff 100644
--- a/net/sched/Makefile
+++ b/net/sched/Makefile
@@ -65,6 +65,7 @@ obj-$(CONFIG_NET_SCH_FQ_PIE) += sch_fq_pie.o
obj-$(CONFIG_NET_SCH_CBS) += sch_cbs.o
obj-$(CONFIG_NET_SCH_ETF) += sch_etf.o
obj-$(CONFIG_NET_SCH_TAPRIO) += sch_taprio.o
+obj-$(CONFIG_NET_SCH_BPF) += sch_bpf.o
obj-$(CONFIG_NET_CLS_U32) += cls_u32.o
obj-$(CONFIG_NET_CLS_ROUTE4) += cls_route.o
diff --git a/net/sched/sch_bpf.c b/net/sched/sch_bpf.c
new file mode 100644
index 000000000000..2998d576708d
--- /dev/null
+++ b/net/sched/sch_bpf.c
@@ -0,0 +1,485 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Programmable Qdisc with eBPF
+ *
+ * Copyright (C) 2022, ByteDance, Cong Wang <cong.wang@xxxxxxxxxxxxx>
+ */
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/jiffies.h>
+#include <linux/string.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/skbuff.h>
+#include <linux/slab.h>
+#include <linux/filter.h>
+#include <linux/bpf.h>
+#include <net/netlink.h>
+#include <net/pkt_sched.h>
+#include <net/pkt_cls.h>
+
+#define ACT_BPF_NAME_LEN 256
+
+struct sch_bpf_prog {
+ struct bpf_prog *prog;
+ const char *name;
+};
+
+struct sch_bpf_class {
+ struct Qdisc_class_common common;
+ struct Qdisc *qdisc;
+
+ unsigned int drops;
+ unsigned int overlimits;
+ struct gnet_stats_basic_sync bstats;
+};
+
+struct sch_bpf_qdisc {
+ struct tcf_proto __rcu *filter_list; /* optional external classifier */
+ struct tcf_block *block;
+ struct Qdisc_class_hash clhash;
+ struct sch_bpf_prog enqueue_prog;
+ struct sch_bpf_prog dequeue_prog;
+
+ struct qdisc_watchdog watchdog;
+};
+
+static int sch_bpf_dump_prog(const struct sch_bpf_prog *prog, struct sk_buff *skb,
+ int name, int id, int tag)
+{
+ struct nlattr *nla;
+
+ if (prog->name &&
+ nla_put_string(skb, name, prog->name))
+ return -EMSGSIZE;
+
+ if (nla_put_u32(skb, id, prog->prog->aux->id))
+ return -EMSGSIZE;
+
+ nla = nla_reserve(skb, tag, sizeof(prog->prog->tag));
+ if (!nla)
+ return -EMSGSIZE;
+
+ memcpy(nla_data(nla), prog->prog->tag, nla_len(nla));
+ return 0;
+}
+
+static int sch_bpf_dump(struct Qdisc *sch, struct sk_buff *skb)
+{
+ struct sch_bpf_qdisc *q = qdisc_priv(sch);
+ struct nlattr *opts;
+ u32 bpf_flags = 0;
+
+ opts = nla_nest_start_noflag(skb, TCA_OPTIONS);
+ if (!opts)
+ goto nla_put_failure;
+
+ if (bpf_flags && nla_put_u32(skb, TCA_SCH_BPF_FLAGS, bpf_flags))
+ goto nla_put_failure;
+
+ if (sch_bpf_dump_prog(&q->enqueue_prog, skb, TCA_SCH_BPF_ENQUEUE_PROG_NAME,
+ TCA_SCH_BPF_ENQUEUE_PROG_ID, TCA_SCH_BPF_ENQUEUE_PROG_TAG))
+ goto nla_put_failure;
+ if (sch_bpf_dump_prog(&q->dequeue_prog, skb, TCA_SCH_BPF_DEQUEUE_PROG_NAME,
+ TCA_SCH_BPF_DEQUEUE_PROG_ID, TCA_SCH_BPF_DEQUEUE_PROG_TAG))
+ goto nla_put_failure;
+
+ return nla_nest_end(skb, opts);
+
+nla_put_failure:
+ return -1;
+}
+
+static int sch_bpf_dump_stats(struct Qdisc *sch, struct gnet_dump *d)
+{
+ return 0;
+}
+
+static struct sch_bpf_class *sch_bpf_find(struct Qdisc *sch, u32 classid)
+{
+ struct sch_bpf_qdisc *q = qdisc_priv(sch);
+ struct Qdisc_class_common *clc;
+
+ clc = qdisc_class_find(&q->clhash, classid);
+ if (!clc)
+ return NULL;
+ return container_of(clc, struct sch_bpf_class, common);
+}
+
+static int sch_bpf_enqueue(struct sk_buff *skb, struct Qdisc *sch,
+ struct sk_buff **to_free)
+{
+ struct sch_bpf_qdisc *q = qdisc_priv(sch);
+ unsigned int len = qdisc_pkt_len(skb);
+ struct sch_bpf_ctx ctx = {};
+ struct sch_bpf_class *cl;
+ int res = NET_XMIT_SUCCESS;
+ struct bpf_prog *enqueue;
+ s64 now;
+
+ enqueue = rcu_dereference(q->enqueue_prog.prog);
+ bpf_compute_data_pointers(skb);
+ ctx.skb = (struct __sk_buff *)skb;
+ ctx.classid = sch->handle;
+ res = bpf_prog_run(enqueue, &ctx);
+ switch (res) {
+ case SCH_BPF_THROTTLE:
+ now = ktime_get_ns();
+ qdisc_watchdog_schedule_ns(&q->watchdog, now + ctx.delay);
+ qdisc_qstats_overlimit(sch);
+ fallthrough;
+ case SCH_BPF_QUEUED:
+ return NET_XMIT_SUCCESS;
+ case SCH_BPF_CN:
+ return NET_XMIT_CN;
+ case SCH_BPF_PASS:
+ break;
+ default:
+ __qdisc_drop(skb, to_free);
+ return NET_XMIT_DROP;
+ }
+
+ cl = sch_bpf_find(sch, ctx.classid);
+ if (!cl || !cl->qdisc) {
+ if (res & __NET_XMIT_BYPASS)
+ qdisc_qstats_drop(sch);
+ __qdisc_drop(skb, to_free);
+ return res;
+ }
+
+ res = qdisc_enqueue(skb, cl->qdisc, to_free);
+ if (res != NET_XMIT_SUCCESS) {
+ if (net_xmit_drop_count(res)) {
+ qdisc_qstats_drop(sch);
+ cl->drops++;
+ }
+ return res;
+ }
+
+ sch->qstats.backlog += len;
+ sch->q.qlen++;
+ return res;
+}
+
+static struct sk_buff *sch_bpf_dequeue(struct Qdisc *sch)
+{
+ struct sch_bpf_qdisc *q = qdisc_priv(sch);
+ struct sk_buff *ret = NULL;
+ struct sch_bpf_ctx ctx = {};
+ struct bpf_prog *dequeue;
+ struct sch_bpf_class *cl;
+ s64 now;
+ int res;
+
+ dequeue = rcu_dereference(q->dequeue_prog.prog);
+ ctx.classid = sch->handle;
+ res = bpf_prog_run(dequeue, &ctx);
+ switch (res) {
+ case SCH_BPF_DEQUEUED:
+ ret = (struct sk_buff *)ctx.skb;
+ break;
+ case SCH_BPF_THROTTLE:
+ now = ktime_get_ns();
+ qdisc_watchdog_schedule_ns(&q->watchdog, now + ctx.delay);
+ qdisc_qstats_overlimit(sch);
+ cl->overlimits++;
+ return NULL;
+ case SCH_BPF_PASS:
+ cl = sch_bpf_find(sch, ctx.classid);
+ if (!cl || !cl->qdisc)
+ return NULL;
+ ret = qdisc_dequeue_peeked(cl->qdisc);
+ if (ret) {
+ qdisc_bstats_update(sch, ret);
+ qdisc_qstats_backlog_dec(sch, ret);
+ sch->q.qlen--;
+ }
+ }
+
+ return ret;
+}
+
+static struct Qdisc *sch_bpf_leaf(struct Qdisc *sch, unsigned long arg)
+{
+ struct sch_bpf_class *cl = (struct sch_bpf_class *)arg;
+
+ return cl->qdisc;
+}
+
+static int sch_bpf_graft(struct Qdisc *sch, unsigned long arg, struct Qdisc *new,
+ struct Qdisc **old, struct netlink_ext_ack *extack)
+{
+ struct sch_bpf_class *cl = (struct sch_bpf_class *)arg;
+
+ if (new)
+ *old = qdisc_replace(sch, new, &cl->qdisc);
+ return 0;
+}
+
+static unsigned long sch_bpf_bind(struct Qdisc *sch, unsigned long parent,
+ u32 classid)
+{
+ return 0;
+}
+
+static void sch_bpf_unbind(struct Qdisc *q, unsigned long cl)
+{
+}
+
+static unsigned long sch_bpf_search(struct Qdisc *sch, u32 handle)
+{
+ return (unsigned long)sch_bpf_find(sch, handle);
+}
+
+static struct tcf_block *sch_bpf_tcf_block(struct Qdisc *sch, unsigned long cl,
+ struct netlink_ext_ack *extack)
+{
+ struct sch_bpf_qdisc *q = qdisc_priv(sch);
+
+ if (cl)
+ return NULL;
+ return q->block;
+}
+
+static const struct nla_policy sch_bpf_policy[TCA_SCH_BPF_MAX + 1] = {
+ [TCA_SCH_BPF_FLAGS] = { .type = NLA_U32 },
+ [TCA_SCH_BPF_ENQUEUE_PROG_FD] = { .type = NLA_U32 },
+ [TCA_SCH_BPF_ENQUEUE_PROG_NAME] = { .type = NLA_NUL_STRING,
+ .len = ACT_BPF_NAME_LEN },
+ [TCA_SCH_BPF_DEQUEUE_PROG_FD] = { .type = NLA_U32 },
+ [TCA_SCH_BPF_DEQUEUE_PROG_NAME] = { .type = NLA_NUL_STRING,
+ .len = ACT_BPF_NAME_LEN },
+};
+
+static int bpf_init_prog(struct nlattr *fd, struct nlattr *name, struct sch_bpf_prog *prog)
+{
+ char *prog_name = NULL;
+ struct bpf_prog *fp;
+ u32 bpf_fd;
+
+ if (!fd)
+ return -EINVAL;
+ bpf_fd = nla_get_u32(fd);
+
+ fp = bpf_prog_get_type(bpf_fd, BPF_PROG_TYPE_QDISC);
+ if (IS_ERR(fp))
+ return PTR_ERR(fp);
+
+ if (name) {
+ prog_name = nla_memdup(name, GFP_KERNEL);
+ if (!prog_name) {
+ bpf_prog_put(fp);
+ return -ENOMEM;
+ }
+ }
+
+ prog->name = prog_name;
+ prog->prog = fp;
+ return 0;
+}
+
+static void bpf_cleanup_prog(struct sch_bpf_prog *prog)
+{
+ if (prog->prog)
+ bpf_prog_put(prog->prog);
+ kfree(prog->name);
+}
+
+static int sch_bpf_change(struct Qdisc *sch, struct nlattr *opt,
+ struct netlink_ext_ack *extack)
+{
+ struct sch_bpf_qdisc *q = qdisc_priv(sch);
+ struct nlattr *tb[TCA_SCH_BPF_MAX + 1];
+ int err;
+
+ if (!opt)
+ return -EINVAL;
+
+ err = nla_parse_nested_deprecated(tb, TCA_SCH_BPF_MAX, opt,
+ sch_bpf_policy, NULL);
+ if (err < 0)
+ return err;
+
+ if (tb[TCA_SCH_BPF_FLAGS]) {
+ u32 bpf_flags = nla_get_u32(tb[TCA_SCH_BPF_FLAGS]);
+
+ if (bpf_flags & ~TCA_SCH_BPF_FLAG_DIRECT)
+ return -EINVAL;
+ }
+
+ err = bpf_init_prog(tb[TCA_SCH_BPF_ENQUEUE_PROG_FD],
+ tb[TCA_SCH_BPF_ENQUEUE_PROG_NAME], &q->enqueue_prog);
+ if (err)
+ return err;
+ err = bpf_init_prog(tb[TCA_SCH_BPF_DEQUEUE_PROG_FD],
+ tb[TCA_SCH_BPF_DEQUEUE_PROG_NAME], &q->dequeue_prog);
+ return err;
+}
+
+static int sch_bpf_init(struct Qdisc *sch, struct nlattr *opt,
+ struct netlink_ext_ack *extack)
+{
+ struct sch_bpf_qdisc *q = qdisc_priv(sch);
+ int err;
+
+ qdisc_watchdog_init(&q->watchdog, sch);
+ if (opt) {
+ err = sch_bpf_change(sch, opt, extack);
+ if (err)
+ return err;
+ }
+
+ err = tcf_block_get(&q->block, &q->filter_list, sch, extack);
+ if (err)
+ return err;
+
+ return qdisc_class_hash_init(&q->clhash);
+}
+
+static void sch_bpf_reset(struct Qdisc *sch)
+{
+ struct sch_bpf_qdisc *q = qdisc_priv(sch);
+
+ qdisc_watchdog_cancel(&q->watchdog);
+}
+
+static void sch_bpf_destroy(struct Qdisc *sch)
+{
+ struct sch_bpf_qdisc *q = qdisc_priv(sch);
+
+ qdisc_watchdog_cancel(&q->watchdog);
+ tcf_block_put(q->block);
+ qdisc_class_hash_destroy(&q->clhash);
+ bpf_cleanup_prog(&q->enqueue_prog);
+ bpf_cleanup_prog(&q->dequeue_prog);
+}
+
+static int sch_bpf_change_class(struct Qdisc *sch, u32 classid,
+ u32 parentid, struct nlattr **tca,
+ unsigned long *arg,
+ struct netlink_ext_ack *extack)
+{
+ struct sch_bpf_class *cl = (struct sch_bpf_class *)*arg;
+ struct sch_bpf_qdisc *q = qdisc_priv(sch);
+
+ if (!cl) {
+ cl = kzalloc(sizeof(*cl), GFP_KERNEL);
+ if (!cl)
+ return -ENOBUFS;
+ qdisc_class_hash_insert(&q->clhash, &cl->common);
+ }
+
+ qdisc_class_hash_grow(sch, &q->clhash);
+ *arg = (unsigned long)cl;
+ return 0;
+}
+
+static int sch_bpf_delete(struct Qdisc *sch, unsigned long arg,
+ struct netlink_ext_ack *extack)
+{
+ struct sch_bpf_class *cl = (struct sch_bpf_class *)arg;
+ struct sch_bpf_qdisc *q = qdisc_priv(sch);
+
+ qdisc_class_hash_remove(&q->clhash, &cl->common);
+ if (cl->qdisc)
+ qdisc_put(cl->qdisc);
+ return 0;
+}
+
+static int sch_bpf_dump_class(struct Qdisc *sch, unsigned long arg,
+ struct sk_buff *skb, struct tcmsg *tcm)
+{
+ return 0;
+}
+
+static int
+sch_bpf_dump_class_stats(struct Qdisc *sch, unsigned long arg, struct gnet_dump *d)
+{
+ struct sch_bpf_class *cl = (struct sch_bpf_class *)arg;
+ struct gnet_stats_queue qs = {
+ .drops = cl->drops,
+ .overlimits = cl->overlimits,
+ };
+ __u32 qlen = 0;
+
+ if (cl->qdisc)
+ qdisc_qstats_qlen_backlog(cl->qdisc, &qlen, &qs.backlog);
+ else
+ qlen = 0;
+
+ if (gnet_stats_copy_basic(d, NULL, &cl->bstats, true) < 0 ||
+ gnet_stats_copy_queue(d, NULL, &qs, qlen) < 0)
+ return -1;
+ return 0;
+}
+
+static void sch_bpf_walk(struct Qdisc *sch, struct qdisc_walker *arg)
+{
+ struct sch_bpf_qdisc *q = qdisc_priv(sch);
+ struct sch_bpf_class *cl;
+ unsigned int i;
+
+ if (arg->stop)
+ return;
+
+ for (i = 0; i < q->clhash.hashsize; i++) {
+ hlist_for_each_entry(cl, &q->clhash.hash[i], common.hnode) {
+ if (arg->count < arg->skip) {
+ arg->count++;
+ continue;
+ }
+ if (arg->fn(sch, (unsigned long)cl, arg) < 0) {
+ arg->stop = 1;
+ return;
+ }
+ arg->count++;
+ }
+ }
+}
+
+static const struct Qdisc_class_ops sch_bpf_class_ops = {
+ .graft = sch_bpf_graft,
+ .leaf = sch_bpf_leaf,
+ .find = sch_bpf_search,
+ .change = sch_bpf_change_class,
+ .delete = sch_bpf_delete,
+ .tcf_block = sch_bpf_tcf_block,
+ .bind_tcf = sch_bpf_bind,
+ .unbind_tcf = sch_bpf_unbind,
+ .dump = sch_bpf_dump_class,
+ .dump_stats = sch_bpf_dump_class_stats,
+ .walk = sch_bpf_walk,
+};
+
+static struct Qdisc_ops sch_bpf_qdisc_ops __read_mostly = {
+ .cl_ops = &sch_bpf_class_ops,
+ .id = "bpf",
+ .priv_size = sizeof(struct sch_bpf_qdisc),
+ .enqueue = sch_bpf_enqueue,
+ .dequeue = sch_bpf_dequeue,
+ .peek = qdisc_peek_dequeued,
+ .init = sch_bpf_init,
+ .reset = sch_bpf_reset,
+ .destroy = sch_bpf_destroy,
+ .change = sch_bpf_change,
+ .dump = sch_bpf_dump,
+ .dump_stats = sch_bpf_dump_stats,
+ .owner = THIS_MODULE,
+};
+
+static int __init sch_bpf_mod_init(void)
+{
+ return register_qdisc(&sch_bpf_qdisc_ops);
+}
+
+static void __exit sch_bpf_mod_exit(void)
+{
+ unregister_qdisc(&sch_bpf_qdisc_ops);
+}
+
+module_init(sch_bpf_mod_init)
+module_exit(sch_bpf_mod_exit)
+MODULE_AUTHOR("Cong Wang");
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("eBPF queue discipline");
--
2.34.1
