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net_sched: sch_fq: add TCA_FQ_WEIGHTS attribute

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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@google.com>
Acked-by: Dave Taht <dave.taht@gmail.com>
Reviewed-by: Willem de Bruijn <willemb@google.com>
Reviewed-by: Toke Høiland-Jørgensen <toke@redhat.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Eric Dumazet 2023-10-02 13:17:38 +00:00 • committed by Paolo Abeni
parent 29f834aa32
commit 49e7265fd0
2 changed files with 36 additions and 0 deletions
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3
include/uapi/linux/pkt_sched.h
View file

@ -943,12 +943,15 @@ enum {
TCA_FQ_PRIOMAP, /* prio2band */ TCA_FQ_PRIOMAP, /* prio2band */
TCA_FQ_WEIGHTS, /* Weights for each band */
__TCA_FQ_MAX __TCA_FQ_MAX
}; };
#define TCA_FQ_MAX (__TCA_FQ_MAX - 1) #define TCA_FQ_MAX (__TCA_FQ_MAX - 1)
#define FQ_BANDS 3 #define FQ_BANDS 3
#define FQ_MIN_WEIGHT 16384
struct tc_fq_qd_stats { struct tc_fq_qd_stats {
__u64 gc_flows; __u64 gc_flows;

33
net/sched/sch_fq.c
View file

@ -919,6 +919,10 @@ static const struct nla_policy fq_policy[TCA_FQ_MAX + 1] = {
.type = NLA_BINARY, .type = NLA_BINARY,
.len = sizeof(struct tc_prio_qopt), .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 */ /* compress a u8 array with all elems <= 3 to an array of 2-bit fields */
@ -941,6 +945,25 @@ static void fq_prio2band_decompress_crumb(const u8 *in, u8 *out)
out[i] = fq_prio2band(in, i); 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_FMT_MOD(extack, "Weight %d less that minimum allowed %d",
weights[i], FQ_MIN_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, static int fq_load_priomap(struct fq_sched_data *q,
const struct nlattr *attr, const struct nlattr *attr,
struct netlink_ext_ack *extack) struct netlink_ext_ack *extack)
@ -1040,6 +1063,9 @@ static int fq_change(struct Qdisc *sch, struct nlattr *opt,
if (!err && tb[TCA_FQ_PRIOMAP]) if (!err && tb[TCA_FQ_PRIOMAP])
err = fq_load_priomap(q, tb[TCA_FQ_PRIOMAP], extack); 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]) if (tb[TCA_FQ_ORPHAN_MASK])
q->orphan_mask = nla_get_u32(tb[TCA_FQ_ORPHAN_MASK]); q->orphan_mask = nla_get_u32(tb[TCA_FQ_ORPHAN_MASK]);
@ -1142,6 +1168,7 @@ static int fq_dump(struct Qdisc *sch, struct sk_buff *skb)
}; };
u64 horizon = q->horizon; u64 horizon = q->horizon;
struct nlattr *opts; struct nlattr *opts;
s32 weights[3];
opts = nla_nest_start_noflag(skb, TCA_OPTIONS); opts = nla_nest_start_noflag(skb, TCA_OPTIONS);
if (opts == NULL) if (opts == NULL)
@ -1175,6 +1202,12 @@ static int fq_dump(struct Qdisc *sch, struct sk_buff *skb)
if (nla_put(skb, TCA_FQ_PRIOMAP, sizeof(prio), &prio)) if (nla_put(skb, TCA_FQ_PRIOMAP, sizeof(prio), &prio))
goto nla_put_failure; 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); return nla_nest_end(skb, opts);
nla_put_failure: nla_put_failure: