netdev - [PATCH net-next 4/4] net_sched: sch_fq: add TCA_FQ

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Date: Sun,  1 Oct 2023 14:51:02 +0000
From: Eric Dumazet <edumazet@...gle.com>
To: "David S . Miller" <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>, 
	Paolo Abeni <pabeni@...hat.com>
Cc: Willem de Bruijn <willemb@...gle.com>, Soheil Hassas Yeganeh <soheil@...gle.com>, 
	Neal Cardwell <ncardwell@...gle.com>, Jamal Hadi Salim <jhs@...atatu.com>, 
	Cong Wang <xiyou.wangcong@...il.com>, Jiri Pirko <jiri@...nulli.us>, netdev@...r.kernel.org, 
	eric.dumazet@...il.com, Eric Dumazet <edumazet@...gle.com>
Subject: [PATCH net-next 4/4] net_sched: sch_fq: add TCA_FQ_WEIGHTS attribute

This attribute can be used to tune the per band weight
and report them in "tc qdisc show" output:

qdisc fq 802f: parent 1:9 limit 100000p flow_limit 500p buckets 1024 orphan_mask 1023
 quantum 8364b initial_quantum 41820b low_rate_threshold 550Kbit
 refill_delay 40ms timer_slack 10us horizon 10s horizon_drop
 bands 3 priomap 1 2 2 2 1 2 0 0 1 1 1 1 1 1 1 1 weights 589824 196608 65536
 Sent 236460814 bytes 792991 pkt (dropped 0, overlimits 0 requeues 0)
 rate 25816bit 10pps backlog 0b 0p requeues 0
  flows 4 (inactive 4 throttled 0)
  gc 0 throttled 19 latency 17.6us fastpath 773882

Signed-off-by: Eric Dumazet <edumazet@...gle.com>
---
 include/uapi/linux/pkt_sched.h |  3 +++
 net/sched/sch_fq.c             | 32 ++++++++++++++++++++++++++++++++
 2 files changed, 35 insertions(+)

diff --git a/include/uapi/linux/pkt_sched.h b/include/uapi/linux/pkt_sched.h
index ec5ab44d41a2493130670870dc9e68c71187740f..f762a10bfb78ed896d8a5b936045a956d97b3831 100644
--- a/include/uapi/linux/pkt_sched.h
+++ b/include/uapi/linux/pkt_sched.h
@@ -943,12 +943,15 @@ enum {
 
 	TCA_FQ_PRIOMAP,		/* prio2band */
 
+	TCA_FQ_WEIGHTS,		/* Weights for each band */
+
 	__TCA_FQ_MAX
 };
 
 #define TCA_FQ_MAX	(__TCA_FQ_MAX - 1)
 
 #define FQ_BANDS 3
+#define FQ_MIN_WEIGHT 16384
 
 struct tc_fq_qd_stats {
 	__u64	gc_flows;
diff --git a/net/sched/sch_fq.c b/net/sched/sch_fq.c
index 1bae145750a66f769bd30f1db09203f725801249..1a411fe36c79a86635f319c230a045d653571700 100644
--- a/net/sched/sch_fq.c
+++ b/net/sched/sch_fq.c
@@ -919,6 +919,10 @@ static const struct nla_policy fq_policy[TCA_FQ_MAX + 1] = {
 			.type = NLA_BINARY,
 			.len = sizeof(struct tc_prio_qopt),
 		},
+	[TCA_FQ_WEIGHTS]		= {
+			.type = NLA_BINARY,
+			.len = FQ_BANDS * sizeof(s32),
+		},
 };
 
 /* compress a u8 array with all elems <= 3 to an array of 2-bit fields */
@@ -941,6 +945,24 @@ static void fq_prio2band_decompress_crumb(const u8 *in, u8 *out)
 		out[i] = fq_prio2band(in, i);
 }
 
+static int fq_load_weights(struct fq_sched_data *q,
+			   const struct nlattr *attr,
+			   struct netlink_ext_ack *extack)
+{
+	s32 *weights = nla_data(attr);
+	int i;
+
+	for (i = 0; i < FQ_BANDS; i++) {
+		if (weights[i] < FQ_MIN_WEIGHT) {
+			NL_SET_ERR_MSG_MOD(extack, "Incorrect weight");
+			return -EINVAL;
+		}
+	}
+	for (i = 0; i < FQ_BANDS; i++)
+		q->band_flows[i].quantum = weights[i];
+	return 0;
+}
+
 static int fq_load_priomap(struct fq_sched_data *q,
 			   const struct nlattr *attr,
 			   struct netlink_ext_ack *extack)
@@ -1039,6 +1061,9 @@ static int fq_change(struct Qdisc *sch, struct nlattr *opt,
 	if (!err && tb[TCA_FQ_PRIOMAP])
 		err = fq_load_priomap(q, tb[TCA_FQ_PRIOMAP], extack);
 
+	if (!err && tb[TCA_FQ_WEIGHTS])
+		err = fq_load_weights(q, tb[TCA_FQ_WEIGHTS], extack);
+
 	if (tb[TCA_FQ_ORPHAN_MASK])
 		q->orphan_mask = nla_get_u32(tb[TCA_FQ_ORPHAN_MASK]);
 
@@ -1141,6 +1166,7 @@ static int fq_dump(struct Qdisc *sch, struct sk_buff *skb)
 	};
 	u64 horizon = q->horizon;
 	struct nlattr *opts;
+	s32 weights[3];
 
 	opts = nla_nest_start_noflag(skb, TCA_OPTIONS);
 	if (opts == NULL)
@@ -1174,6 +1200,12 @@ static int fq_dump(struct Qdisc *sch, struct sk_buff *skb)
 	if (nla_put(skb, TCA_FQ_PRIOMAP, sizeof(prio), &prio))
 		goto nla_put_failure;
 
+	weights[0] = q->band_flows[0].quantum;
+	weights[1] = q->band_flows[1].quantum;
+	weights[2] = q->band_flows[2].quantum;
+	if (nla_put(skb, TCA_FQ_WEIGHTS, sizeof(weights), &weights))
+		goto nla_put_failure;
+
 	return nla_nest_end(skb, opts);
 
 nla_put_failure:
-- 
2.42.0.582.g8ccd20d70d-goog