Commit 454d3e1a authored by Davide Caratti's avatar Davide Caratti Committed by David S. Miller

net/sched: sch_ets: properly init all active DRR list handles

leaf classes of ETS qdiscs are served in strict priority or deficit round
robin (DRR), depending on the value of 'nstrict'. Since this value can be
changed while traffic is running, we need to be sure that the active list
of DRR classes can be updated at any time, so:

1) call INIT_LIST_HEAD(&alist) on all leaf classes in .init(), before the
   first packet hits any of them.
2) ensure that 'alist' is not overwritten with zeros when a leaf class is
   no more strict priority nor DRR (i.e. array elements beyond 'nbands').

Link: https://lore.kernel.org/netdev/YS%2FoZ+f0Nr8eQkzH@dcaratti.users.ipa.redhat.comSuggested-by: default avatarCong Wang <cong.wang@bytedance.com>
Signed-off-by: default avatarDavide Caratti <dcaratti@redhat.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent d5ac07df
......@@ -661,7 +661,6 @@ static int ets_qdisc_change(struct Qdisc *sch, struct nlattr *opt,
q->nbands = nbands;
for (i = nstrict; i < q->nstrict; i++) {
INIT_LIST_HEAD(&q->classes[i].alist);
if (q->classes[i].qdisc->q.qlen) {
list_add_tail(&q->classes[i].alist, &q->active);
q->classes[i].deficit = quanta[i];
......@@ -687,7 +686,11 @@ static int ets_qdisc_change(struct Qdisc *sch, struct nlattr *opt,
ets_offload_change(sch);
for (i = q->nbands; i < oldbands; i++) {
qdisc_put(q->classes[i].qdisc);
memset(&q->classes[i], 0, sizeof(q->classes[i]));
q->classes[i].qdisc = NULL;
q->classes[i].quantum = 0;
q->classes[i].deficit = 0;
memset(&q->classes[i].bstats, 0, sizeof(q->classes[i].bstats));
memset(&q->classes[i].qstats, 0, sizeof(q->classes[i].qstats));
}
return 0;
}
......@@ -696,7 +699,7 @@ static int ets_qdisc_init(struct Qdisc *sch, struct nlattr *opt,
struct netlink_ext_ack *extack)
{
struct ets_sched *q = qdisc_priv(sch);
int err;
int err, i;
if (!opt)
return -EINVAL;
......@@ -706,6 +709,9 @@ static int ets_qdisc_init(struct Qdisc *sch, struct nlattr *opt,
return err;
INIT_LIST_HEAD(&q->active);
for (i = 0; i < TCQ_ETS_MAX_BANDS; i++)
INIT_LIST_HEAD(&q->classes[i].alist);
return ets_qdisc_change(sch, opt, extack);
}
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment