net_sched: introduce eBPF based Qdisc

Signed-off-by: Cong Wang <cong.wang@bytedance.com>
0day-ci · Dec 24, 2021 · 3281415 · 3281415
1 parent 98f7877
commit 3281415
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Showing 6 changed files with 571 additions and 0 deletions.
diff --git 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_SCHED_QDISC, tc_cls_act,
+//	      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
@@ -950,6 +950,7 @@ 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_SCHED_QDISC,
 };
 
 enum bpf_attach_type {
@@ -6489,4 +6490,18 @@ 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_OK,
+	SCH_BPF_QUEUED,
+	SCH_BPF_DROP,
+	SCH_BPF_THROTTLE,
+	SCH_BPF_CONTINUE,
+};
+
 #endif /* _UAPI__LINUX_BPF_H__ */
diff --git a/include/uapi/linux/pkt_sched.h b/include/uapi/linux/pkt_sched.h
@@ -1267,4 +1267,21 @@ 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/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
@@ -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