From: Vlad Buslov <vladbu@mellanox.com>
To: davem@davemloft.net
Cc: netdev@vger.kernel.org, jhs@mojatatu.com,
xiyou.wangcong@gmail.com, jiri@resnulli.us,
linux-kernel@vger.kernel.org, Vlad Buslov <vladbu@mellanox.com>
Subject: [PATCH net-next v2] net: sched: don't disable bh when accessing action idr
Date: Mon, 21 May 2018 23:03:04 +0300 [thread overview]
Message-ID: <1526932984-11544-1-git-send-email-vladbu@mellanox.com> (raw)
In-Reply-To: <20180519.230258.1374885458106197707.davem@davemloft.net>
Initial net_device implementation used ingress_lock spinlock to synchronize
ingress path of device. This lock was used in both process and bh context.
In some code paths action map lock was obtained while holding ingress_lock.
Commit e1e992e52faa ("[NET_SCHED] protect action config/dump from irqs")
modified actions to always disable bh, while using action map lock, in
order to prevent deadlock on ingress_lock in softirq. This lock was removed
from net_device, so disabling bh, while accessing action map, is no longer
necessary.
Replace all action idr spinlock usage with regular calls that do not
disable bh.
Signed-off-by: Vlad Buslov <vladbu@mellanox.com>
---
net/sched/act_api.c | 20 ++++++++++----------
1 file changed, 10 insertions(+), 10 deletions(-)
diff --git a/net/sched/act_api.c b/net/sched/act_api.c
index 72251241665a..3f4cf930f809 100644
--- a/net/sched/act_api.c
+++ b/net/sched/act_api.c
@@ -77,9 +77,9 @@ static void free_tcf(struct tc_action *p)
static void tcf_idr_remove(struct tcf_idrinfo *idrinfo, struct tc_action *p)
{
- spin_lock_bh(&idrinfo->lock);
+ spin_lock(&idrinfo->lock);
idr_remove(&idrinfo->action_idr, p->tcfa_index);
- spin_unlock_bh(&idrinfo->lock);
+ spin_unlock(&idrinfo->lock);
gen_kill_estimator(&p->tcfa_rate_est);
free_tcf(p);
}
@@ -156,7 +156,7 @@ static int tcf_dump_walker(struct tcf_idrinfo *idrinfo, struct sk_buff *skb,
struct tc_action *p;
unsigned long id = 1;
- spin_lock_bh(&idrinfo->lock);
+ spin_lock(&idrinfo->lock);
s_i = cb->args[0];
@@ -191,7 +191,7 @@ static int tcf_dump_walker(struct tcf_idrinfo *idrinfo, struct sk_buff *skb,
if (index >= 0)
cb->args[0] = index + 1;
- spin_unlock_bh(&idrinfo->lock);
+ spin_unlock(&idrinfo->lock);
if (n_i) {
if (act_flags & TCA_FLAG_LARGE_DUMP_ON)
cb->args[1] = n_i;
@@ -261,9 +261,9 @@ static struct tc_action *tcf_idr_lookup(u32 index, struct tcf_idrinfo *idrinfo)
{
struct tc_action *p = NULL;
- spin_lock_bh(&idrinfo->lock);
+ spin_lock(&idrinfo->lock);
p = idr_find(&idrinfo->action_idr, index);
- spin_unlock_bh(&idrinfo->lock);
+ spin_unlock(&idrinfo->lock);
return p;
}
@@ -323,7 +323,7 @@ int tcf_idr_create(struct tc_action_net *tn, u32 index, struct nlattr *est,
}
spin_lock_init(&p->tcfa_lock);
idr_preload(GFP_KERNEL);
- spin_lock_bh(&idrinfo->lock);
+ spin_lock(&idrinfo->lock);
/* user doesn't specify an index */
if (!index) {
index = 1;
@@ -331,7 +331,7 @@ int tcf_idr_create(struct tc_action_net *tn, u32 index, struct nlattr *est,
} else {
err = idr_alloc_u32(idr, NULL, &index, index, GFP_ATOMIC);
}
- spin_unlock_bh(&idrinfo->lock);
+ spin_unlock(&idrinfo->lock);
idr_preload_end();
if (err)
goto err3;
@@ -369,9 +369,9 @@ void tcf_idr_insert(struct tc_action_net *tn, struct tc_action *a)
{
struct tcf_idrinfo *idrinfo = tn->idrinfo;
- spin_lock_bh(&idrinfo->lock);
+ spin_lock(&idrinfo->lock);
idr_replace(&idrinfo->action_idr, a, a->tcfa_index);
- spin_unlock_bh(&idrinfo->lock);
+ spin_unlock(&idrinfo->lock);
}
EXPORT_SYMBOL(tcf_idr_insert);
--
2.7.5
next prev parent reply other threads:[~2018-05-21 20:03 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-05-18 15:45 [PATCH] net: sched: don't disable bh when accessing action idr Vlad Buslov
2018-05-19 2:59 ` Cong Wang
2018-05-19 10:12 ` Vlad Buslov
2018-05-20 3:02 ` David Miller
2018-05-21 20:03 ` Vlad Buslov [this message]
2018-05-22 12:50 ` [PATCH net-next v2] " Jamal Hadi Salim
2018-05-23 1:10 ` Cong Wang
2018-05-23 6:57 ` Vlad Buslov
2018-05-23 7:32 ` Jiri Pirko
2018-05-23 8:52 ` [PATCH net-next v3] " Vlad Buslov
2018-05-23 23:14 ` Cong Wang
2018-05-24 16:54 ` Vlad Buslov
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