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net: sched: gred: dynamically allocate tc_gred_qopt_offload

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The tc_gred_qopt_offload structure has grown too big to be on the
stack for 32-bit architectures after recent changes.

net/sched/sch_gred.c:903:13: error: stack frame size (1180) exceeds limit (1024) in 'gred_destroy' [-Werror,-Wframe-larger-than]
net/sched/sch_gred.c:310:13: error: stack frame size (1212) exceeds limit (1024) in 'gred_offload' [-Werror,-Wframe-larger-than]

Use dynamic allocation per qdisc to avoid this.

Fixes: 50dc9a8572 ("net: sched: Merge Qdisc::bstats and Qdisc::cpu_bstats data types")
Fixes: 67c9e6270f ("net: sched: Protect Qdisc::bstats with u64_stats")
Suggested-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Link: https://lore.kernel.org/r/20211026100711.nalhttf6mbe6sudx@linutronix.de
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Arnd Bergmann 2021-10-26 12:07:11 +02:00 committed by Jakub Kicinski
parent 4796e2518a
commit f25c0515c5
1 changed files with 30 additions and 20 deletions
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50
net/sched/sch_gred.c
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@ -56,6 +56,7 @@ struct gred_sched {
u32 DPs;
u32 def;
struct red_vars wred_set;
struct tc_gred_qopt_offload *opt;
};
static inline int gred_wred_mode(struct gred_sched *table)
@ -311,42 +312,43 @@ static void gred_offload(struct Qdisc *sch, enum tc_gred_command command)
{
struct gred_sched *table = qdisc_priv(sch);
struct net_device *dev = qdisc_dev(sch);
struct tc_gred_qopt_offload opt = {
.command = command,
.handle = sch->handle,
.parent = sch->parent,
};
struct tc_gred_qopt_offload *opt = table->opt;
if (!tc_can_offload(dev) || !dev->netdev_ops->ndo_setup_tc)
return;
memset(opt, 0, sizeof(*opt));
opt->command = command;
opt->handle = sch->handle;
opt->parent = sch->parent;
if (command == TC_GRED_REPLACE) {
unsigned int i;
opt.set.grio_on = gred_rio_mode(table);
opt.set.wred_on = gred_wred_mode(table);
opt.set.dp_cnt = table->DPs;
opt.set.dp_def = table->def;
opt->set.grio_on = gred_rio_mode(table);
opt->set.wred_on = gred_wred_mode(table);
opt->set.dp_cnt = table->DPs;
opt->set.dp_def = table->def;
for (i = 0; i < table->DPs; i++) {
struct gred_sched_data *q = table->tab[i];
if (!q)
continue;
opt.set.tab[i].present = true;
opt.set.tab[i].limit = q->limit;
opt.set.tab[i].prio = q->prio;
opt.set.tab[i].min = q->parms.qth_min >> q->parms.Wlog;
opt.set.tab[i].max = q->parms.qth_max >> q->parms.Wlog;
opt.set.tab[i].is_ecn = gred_use_ecn(q);
opt.set.tab[i].is_harddrop = gred_use_harddrop(q);
opt.set.tab[i].probability = q->parms.max_P;
opt.set.tab[i].backlog = &q->backlog;
opt->set.tab[i].present = true;
opt->set.tab[i].limit = q->limit;
opt->set.tab[i].prio = q->prio;
opt->set.tab[i].min = q->parms.qth_min >> q->parms.Wlog;
opt->set.tab[i].max = q->parms.qth_max >> q->parms.Wlog;
opt->set.tab[i].is_ecn = gred_use_ecn(q);
opt->set.tab[i].is_harddrop = gred_use_harddrop(q);
opt->set.tab[i].probability = q->parms.max_P;
opt->set.tab[i].backlog = &q->backlog;
}
opt.set.qstats = &sch->qstats;
opt->set.qstats = &sch->qstats;
}
dev->netdev_ops->ndo_setup_tc(dev, TC_SETUP_QDISC_GRED, &opt);
dev->netdev_ops->ndo_setup_tc(dev, TC_SETUP_QDISC_GRED, opt);
}
static int gred_offload_dump_stats(struct Qdisc *sch)
@ -731,6 +733,7 @@ err_unlock_free:
static int gred_init(struct Qdisc *sch, struct nlattr *opt,
struct netlink_ext_ack *extack)
{
struct gred_sched *table = qdisc_priv(sch);
struct nlattr *tb[TCA_GRED_MAX + 1];
int err;
@ -754,6 +757,12 @@ static int gred_init(struct Qdisc *sch, struct nlattr *opt,
sch->limit = qdisc_dev(sch)->tx_queue_len
* psched_mtu(qdisc_dev(sch));
if (qdisc_dev(sch)->netdev_ops->ndo_setup_tc) {
table->opt = kzalloc(sizeof(*table->opt), GFP_KERNEL);
if (!table->opt)
return -ENOMEM;
}
return gred_change_table_def(sch, tb[TCA_GRED_DPS], extack);
}
@ -910,6 +919,7 @@ static void gred_destroy(struct Qdisc *sch)
gred_destroy_vq(table->tab[i]);
}
gred_offload(sch, TC_GRED_DESTROY);
kfree(table->opt);
}
static struct Qdisc_ops gred_qdisc_ops __read_mostly = {