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net: hold netdev instance lock during qdisc ndo_setup_tc

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Qdisc operations that can lead to ndo_setup_tc might need
to have an instance lock. Add netdev_lock_ops/netdev_unlock_ops
invocations for all psched_rtnl_msg_handlers operations.

Cc: Cong Wang <xiyou.wangcong@gmail.com>
Cc: Jiri Pirko <jiri@resnulli.us>
Cc: Saeed Mahameed <saeed@kernel.org>
Reviewed-by: Jamal Hadi Salim <jhs@mojatatu.com>
Signed-off-by: Stanislav Fomichev <sdf@fomichev.me>
Link: https://patch.msgid.link/20250305163732.2766420-5-sdf@fomichev.me
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Stanislav Fomichev 2025-03-05 08:37:22 -08:00 • committed by Jakub Kicinski
parent 7c79cff955
commit a0527ee2df
1 changed files with 24 additions and 4 deletions
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28
net/sched/sch_api.c
View file

@ -1279,9 +1279,11 @@ static struct Qdisc *qdisc_create(struct net_device *dev,
* We replay the request because the device may
* go away in the mean time.
*/
netdev_unlock_ops(dev);
rtnl_unlock();
request_module(NET_SCH_ALIAS_PREFIX "%s", name);
rtnl_lock();
netdev_lock_ops(dev);
ops = qdisc_lookup_ops(kind);
if (ops != NULL) {
/* We will try again qdisc_lookup_ops,
@ -1591,7 +1593,11 @@ static int tc_get_qdisc(struct sk_buff *skb, struct nlmsghdr *n,
if (!dev)
return -ENODEV;
return __tc_get_qdisc(skb, n, extack, dev, tca, tcm);
netdev_lock_ops(dev);
err = __tc_get_qdisc(skb, n, extack, dev, tca, tcm);
netdev_unlock_ops(dev);
return err;
}
static bool req_create_or_replace(struct nlmsghdr *n)
@ -1828,7 +1834,9 @@ replay:
return -ENODEV;
replay = false;
netdev_lock_ops(dev);
err = __tc_modify_qdisc(skb, n, extack, dev, tca, tcm, &replay);
netdev_unlock_ops(dev);
if (replay)
goto replay;
@ -1919,17 +1927,23 @@ static int tc_dump_qdisc(struct sk_buff *skb, struct netlink_callback *cb)
s_q_idx = 0;
q_idx = 0;
netdev_lock_ops(dev);
if (tc_dump_qdisc_root(rtnl_dereference(dev->qdisc),
skb, cb, &q_idx, s_q_idx,
true, tca[TCA_DUMP_INVISIBLE]) < 0)
true, tca[TCA_DUMP_INVISIBLE]) < 0) {
netdev_unlock_ops(dev);
goto done;
}
dev_queue = dev_ingress_queue(dev);
if (dev_queue &&
tc_dump_qdisc_root(rtnl_dereference(dev_queue->qdisc_sleeping),
skb, cb, &q_idx, s_q_idx, false,
tca[TCA_DUMP_INVISIBLE]) < 0)
tca[TCA_DUMP_INVISIBLE]) < 0) {
netdev_unlock_ops(dev);
goto done;
}
netdev_unlock_ops(dev);
cont:
idx++;
@ -2308,7 +2322,11 @@ static int tc_ctl_tclass(struct sk_buff *skb, struct nlmsghdr *n,
if (!dev)
return -ENODEV;
return __tc_ctl_tclass(skb, n, extack, dev, tca, tcm);
netdev_lock_ops(dev);
err = __tc_ctl_tclass(skb, n, extack, dev, tca, tcm);
netdev_unlock_ops(dev);
return err;
}
struct qdisc_dump_args {
@ -2426,7 +2444,9 @@ static int tc_dump_tclass(struct sk_buff *skb, struct netlink_callback *cb)
if (!dev)
return 0;
netdev_lock_ops(dev);
err = __tc_dump_tclass(skb, cb, tcm, dev);
netdev_unlock_ops(dev);
dev_put(dev);