From: Amery Hung <ameryhung@gmail.com>
To: netdev@vger.kernel.org
Cc: bpf@vger.kernel.org, daniel@iogearbox.net, andrii@kernel.org,
alexei.starovoitov@gmail.com, martin.lau@kernel.org,
sinquersw@gmail.com, toke@redhat.com, jhs@mojatatu.com,
jiri@resnulli.us, stfomichev@gmail.com,
ekarani.silvestre@ccc.ufcg.edu.br, yangpeihao@sjtu.edu.cn,
xiyou.wangcong@gmail.com, yepeilin.cs@gmail.com,
ameryhung@gmail.com, amery.hung@bytedance.com
Subject: [PATCH bpf-next v2 08/14] bpf: net_sched: Add a qdisc watchdog timer
Date: Fri, 20 Dec 2024 11:55:34 -0800 [thread overview]
Message-ID: <20241220195619.2022866-9-amery.hung@gmail.com> (raw)
In-Reply-To: <20241220195619.2022866-1-amery.hung@gmail.com>
From: Amery Hung <amery.hung@bytedance.com>
Add a watchdog timer to bpf qdisc. The watchdog can be used to schedule
the execution of qdisc through kfunc, bpf_qdisc_schedule(). It can be
useful for building traffic shaping scheduling algorithm, where the time
the next packet will be dequeued is known.
Signed-off-by: Amery Hung <amery.hung@bytedance.com>
---
include/linux/filter.h | 10 +++++
net/sched/bpf_qdisc.c | 92 ++++++++++++++++++++++++++++++++++++++++++
2 files changed, 102 insertions(+)
diff --git a/include/linux/filter.h b/include/linux/filter.h
index 0477254bc2d3..3bc9b741a120 100644
--- a/include/linux/filter.h
+++ b/include/linux/filter.h
@@ -469,6 +469,16 @@ static inline bool insn_is_cast_user(const struct bpf_insn *insn)
.off = 0, \
.imm = BPF_CALL_IMM(FUNC) })
+/* Kfunc call */
+
+#define BPF_CALL_KFUNC(OFF, IMM) \
+ ((struct bpf_insn) { \
+ .code = BPF_JMP | BPF_CALL, \
+ .dst_reg = 0, \
+ .src_reg = BPF_PSEUDO_KFUNC_CALL, \
+ .off = OFF, \
+ .imm = IMM })
+
/* Raw code statement block */
#define BPF_RAW_INSN(CODE, DST, SRC, OFF, IMM) \
diff --git a/net/sched/bpf_qdisc.c b/net/sched/bpf_qdisc.c
index 1c92bfcc3847..bbe7aded6f24 100644
--- a/net/sched/bpf_qdisc.c
+++ b/net/sched/bpf_qdisc.c
@@ -8,6 +8,10 @@
static struct bpf_struct_ops bpf_Qdisc_ops;
+struct bpf_sched_data {
+ struct qdisc_watchdog watchdog;
+};
+
struct bpf_sk_buff_ptr {
struct sk_buff *skb;
};
@@ -108,6 +112,46 @@ static int bpf_qdisc_btf_struct_access(struct bpf_verifier_log *log,
return 0;
}
+BTF_ID_LIST(bpf_qdisc_init_prologue_ids)
+BTF_ID(func, bpf_qdisc_init_prologue)
+
+static int bpf_qdisc_gen_prologue(struct bpf_insn *insn_buf, bool direct_write,
+ const struct bpf_prog *prog)
+{
+ struct bpf_insn *insn = insn_buf;
+
+ if (strcmp(prog->aux->attach_func_name, "init"))
+ return 0;
+
+ *insn++ = BPF_MOV64_REG(BPF_REG_6, BPF_REG_1);
+ *insn++ = BPF_LDX_MEM(BPF_DW, BPF_REG_1, BPF_REG_1, 0);
+ *insn++ = BPF_CALL_KFUNC(0, bpf_qdisc_init_prologue_ids[0]);
+ *insn++ = BPF_MOV64_REG(BPF_REG_1, BPF_REG_6);
+ *insn++ = prog->insnsi[0];
+
+ return insn - insn_buf;
+}
+
+BTF_ID_LIST(bpf_qdisc_reset_destroy_epilogue_ids)
+BTF_ID(func, bpf_qdisc_reset_destroy_epilogue)
+
+static int bpf_qdisc_gen_epilogue(struct bpf_insn *insn_buf, const struct bpf_prog *prog,
+ s16 ctx_stack_off)
+{
+ struct bpf_insn *insn = insn_buf;
+
+ if (strcmp(prog->aux->attach_func_name, "reset") &&
+ strcmp(prog->aux->attach_func_name, "destroy"))
+ return 0;
+
+ *insn++ = BPF_LDX_MEM(BPF_DW, BPF_REG_1, BPF_REG_FP, ctx_stack_off);
+ *insn++ = BPF_LDX_MEM(BPF_DW, BPF_REG_1, BPF_REG_1, 0);
+ *insn++ = BPF_CALL_KFUNC(0, bpf_qdisc_reset_destroy_epilogue_ids[0]);
+ *insn++ = BPF_EXIT_INSN();
+
+ return insn - insn_buf;
+}
+
__bpf_kfunc_start_defs();
/* bpf_skb_get_hash - Get the flow hash of an skb.
@@ -136,6 +180,36 @@ __bpf_kfunc void bpf_qdisc_skb_drop(struct sk_buff *skb,
__qdisc_drop(skb, (struct sk_buff **)to_free_list);
}
+/* bpf_qdisc_watchdog_schedule - Schedule a qdisc to a later time using a timer.
+ * @sch: The qdisc to be scheduled.
+ * @expire: The expiry time of the timer.
+ * @delta_ns: The slack range of the timer.
+ */
+__bpf_kfunc void bpf_qdisc_watchdog_schedule(struct Qdisc *sch, u64 expire, u64 delta_ns)
+{
+ struct bpf_sched_data *q = qdisc_priv(sch);
+
+ qdisc_watchdog_schedule_range_ns(&q->watchdog, expire, delta_ns);
+}
+
+/* bpf_qdisc_init_prologue - Hidden kfunc called in prologue of .init. */
+__bpf_kfunc void bpf_qdisc_init_prologue(struct Qdisc *sch)
+{
+ struct bpf_sched_data *q = qdisc_priv(sch);
+
+ qdisc_watchdog_init(&q->watchdog, sch);
+}
+
+/* bpf_qdisc_reset_destroy_epilogue - Hidden kfunc called in epilogue of .reset
+ * and .destroy
+ */
+__bpf_kfunc void bpf_qdisc_reset_destroy_epilogue(struct Qdisc *sch)
+{
+ struct bpf_sched_data *q = qdisc_priv(sch);
+
+ qdisc_watchdog_cancel(&q->watchdog);
+}
+
__bpf_kfunc_end_defs();
BTF_KFUNCS_START(qdisc_kfunc_ids)
@@ -143,6 +217,9 @@ BTF_ID_FLAGS(func, bpf_skb_get_hash, KF_TRUSTED_ARGS)
BTF_ID_FLAGS(func, bpf_kfree_skb, KF_RELEASE)
BTF_ID_FLAGS(func, bpf_qdisc_skb_drop, KF_RELEASE)
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_KFUNCS_END(qdisc_kfunc_ids)
BTF_SET_START(qdisc_common_kfunc_set)
@@ -152,8 +229,13 @@ BTF_SET_END(qdisc_common_kfunc_set)
BTF_SET_START(qdisc_enqueue_kfunc_set)
BTF_ID(func, bpf_qdisc_skb_drop)
+BTF_ID(func, bpf_qdisc_watchdog_schedule)
BTF_SET_END(qdisc_enqueue_kfunc_set)
+BTF_SET_START(qdisc_dequeue_kfunc_set)
+BTF_ID(func, bpf_qdisc_watchdog_schedule)
+BTF_SET_END(qdisc_dequeue_kfunc_set)
+
static int bpf_qdisc_kfunc_filter(const struct bpf_prog *prog, u32 kfunc_id)
{
if (bpf_Qdisc_ops.type != btf_type_by_id(prog->aux->attach_btf,
@@ -170,6 +252,9 @@ static int bpf_qdisc_kfunc_filter(const struct bpf_prog *prog, u32 kfunc_id)
if (!strcmp(prog->aux->attach_func_name, "enqueue")) {
if (btf_id_set_contains(&qdisc_enqueue_kfunc_set, kfunc_id))
return 0;
+ } else if (!strcmp(prog->aux->attach_func_name, "dequeue")) {
+ if (btf_id_set_contains(&qdisc_dequeue_kfunc_set, kfunc_id))
+ return 0;
}
return btf_id_set_contains(&qdisc_common_kfunc_set, kfunc_id) ? 0 : -EACCES;
@@ -185,6 +270,8 @@ static const struct bpf_verifier_ops bpf_qdisc_verifier_ops = {
.get_func_proto = bpf_qdisc_get_func_proto,
.is_valid_access = bpf_qdisc_is_valid_access,
.btf_struct_access = bpf_qdisc_btf_struct_access,
+ .gen_prologue = bpf_qdisc_gen_prologue,
+ .gen_epilogue = bpf_qdisc_gen_epilogue,
};
static int bpf_qdisc_init_member(const struct btf_type *t,
@@ -200,6 +287,11 @@ static int bpf_qdisc_init_member(const struct btf_type *t,
moff = __btf_member_bit_offset(t, member) / 8;
switch (moff) {
+ case offsetof(struct Qdisc_ops, priv_size):
+ if (uqdisc_ops->priv_size)
+ return -EINVAL;
+ qdisc_ops->priv_size = sizeof(struct bpf_sched_data);
+ return 1;
case offsetof(struct Qdisc_ops, peek):
qdisc_ops->peek = qdisc_peek_dequeued;
return 0;
--
2.47.0
next prev parent reply other threads:[~2024-12-20 19:56 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-12-20 19:55 [PATCH bpf-next v2 00/14] bpf qdisc Amery Hung
2024-12-20 19:55 ` [PATCH bpf-next v2 01/14] bpf: Support getting referenced kptr from struct_ops argument Amery Hung
2025-01-23 9:57 ` Eduard Zingerman
2025-01-23 19:41 ` Amery Hung
2024-12-20 19:55 ` [PATCH bpf-next v2 02/14] selftests/bpf: Test referenced kptr arguments of struct_ops programs Amery Hung
2025-01-23 9:57 ` Eduard Zingerman
2025-01-24 0:04 ` Amery Hung
2024-12-20 19:55 ` [PATCH bpf-next v2 03/14] bpf: Allow struct_ops prog to return referenced kptr Amery Hung
2025-01-15 15:25 ` Ming Lei
2025-01-23 9:57 ` Eduard Zingerman
2025-01-23 18:19 ` Eduard Zingerman
2024-12-20 19:55 ` [PATCH bpf-next v2 04/14] selftests/bpf: Test returning referenced kptr from struct_ops programs Amery Hung
2025-01-23 9:58 ` Eduard Zingerman
2024-12-20 19:55 ` [PATCH bpf-next v2 05/14] bpf: net_sched: Support implementation of Qdisc_ops in bpf Amery Hung
2025-01-09 15:00 ` Amery Hung
2025-01-10 0:28 ` Martin KaFai Lau
2025-01-10 1:20 ` Jakub Kicinski
2024-12-20 19:55 ` [PATCH bpf-next v2 06/14] bpf: net_sched: Add basic bpf qdisc kfuncs Amery Hung
2025-01-10 0:24 ` Martin KaFai Lau
2025-01-10 18:00 ` Amery Hung
2024-12-20 19:55 ` [PATCH bpf-next v2 07/14] bpf: Search and add kfuncs in struct_ops prologue and epilogue Amery Hung
2024-12-20 19:55 ` Amery Hung [this message]
2025-01-09 0:20 ` [PATCH bpf-next v2 08/14] bpf: net_sched: Add a qdisc watchdog timer Martin KaFai Lau
2025-01-09 15:00 ` Amery Hung
2024-12-20 19:55 ` [PATCH bpf-next v2 09/14] bpf: net_sched: Support updating bstats Amery Hung
2024-12-20 19:55 ` [PATCH bpf-next v2 10/14] bpf: net_sched: Support updating qstats Amery Hung
2024-12-20 19:55 ` [PATCH bpf-next v2 11/14] bpf: net_sched: Allow writing to more Qdisc members Amery Hung
2024-12-20 19:55 ` [PATCH bpf-next v2 12/14] libbpf: Support creating and destroying qdisc Amery Hung
2024-12-20 19:55 ` [PATCH bpf-next v2 13/14] selftests: Add a basic fifo qdisc test Amery Hung
2025-01-10 0:05 ` Martin KaFai Lau
2024-12-20 19:55 ` [PATCH bpf-next v2 14/14] selftests: Add a bpf fq qdisc to selftest Amery Hung
2025-01-09 23:36 ` Martin KaFai Lau
2025-01-02 17:29 ` [PATCH bpf-next v2 00/14] bpf qdisc Toke Høiland-Jørgensen
2025-01-10 1:43 ` Martin KaFai Lau
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20241220195619.2022866-9-amery.hung@gmail.com \
--to=ameryhung@gmail.com \
--cc=alexei.starovoitov@gmail.com \
--cc=amery.hung@bytedance.com \
--cc=andrii@kernel.org \
--cc=bpf@vger.kernel.org \
--cc=daniel@iogearbox.net \
--cc=ekarani.silvestre@ccc.ufcg.edu.br \
--cc=jhs@mojatatu.com \
--cc=jiri@resnulli.us \
--cc=martin.lau@kernel.org \
--cc=netdev@vger.kernel.org \
--cc=sinquersw@gmail.com \
--cc=stfomichev@gmail.com \
--cc=toke@redhat.com \
--cc=xiyou.wangcong@gmail.com \
--cc=yangpeihao@sjtu.edu.cn \
--cc=yepeilin.cs@gmail.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox