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authorVlad Buslov <vladbu@mellanox.com>2018-08-10 20:51:54 +0300
committerDavid S. Miller <davem@davemloft.net>2018-08-11 22:37:10 +0300
commit51a9f5ae653979ac4bdbd81778a10431f0177e3c (patch)
treef1722ebb58f4b1d6f03b69d98120087a2decbbca
parent4e232818bd32b29f15bef532f320a14367d172b4 (diff)
downloadlinux-51a9f5ae653979ac4bdbd81778a10431f0177e3c.tar.xz
net: core: protect rate estimator statistics pointer with lock
Extend gen_new_estimator() to also take stats_lock when re-assigning rate estimator statistics pointer. (to be used by unlocked actions) Rename 'stats_lock' to 'lock' and change argument description to explain that it is now also used for control path. Signed-off-by: Vlad Buslov <vladbu@mellanox.com> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--include/net/gen_stats.h4
-rw-r--r--net/core/gen_estimator.c21
2 files changed, 15 insertions, 10 deletions
diff --git a/include/net/gen_stats.h b/include/net/gen_stats.h
index 0304ba2ae353..883bb9085f15 100644
--- a/include/net/gen_stats.h
+++ b/include/net/gen_stats.h
@@ -59,13 +59,13 @@ int gnet_stats_finish_copy(struct gnet_dump *d);
int gen_new_estimator(struct gnet_stats_basic_packed *bstats,
struct gnet_stats_basic_cpu __percpu *cpu_bstats,
struct net_rate_estimator __rcu **rate_est,
- spinlock_t *stats_lock,
+ spinlock_t *lock,
seqcount_t *running, struct nlattr *opt);
void gen_kill_estimator(struct net_rate_estimator __rcu **ptr);
int gen_replace_estimator(struct gnet_stats_basic_packed *bstats,
struct gnet_stats_basic_cpu __percpu *cpu_bstats,
struct net_rate_estimator __rcu **ptr,
- spinlock_t *stats_lock,
+ spinlock_t *lock,
seqcount_t *running, struct nlattr *opt);
bool gen_estimator_active(struct net_rate_estimator __rcu **ptr);
bool gen_estimator_read(struct net_rate_estimator __rcu **ptr,
diff --git a/net/core/gen_estimator.c b/net/core/gen_estimator.c
index 98fd12721221..e4e442d70c2d 100644
--- a/net/core/gen_estimator.c
+++ b/net/core/gen_estimator.c
@@ -112,7 +112,7 @@ static void est_timer(struct timer_list *t)
* @bstats: basic statistics
* @cpu_bstats: bstats per cpu
* @rate_est: rate estimator statistics
- * @stats_lock: statistics lock
+ * @lock: lock for statistics and control path
* @running: qdisc running seqcount
* @opt: rate estimator configuration TLV
*
@@ -128,7 +128,7 @@ static void est_timer(struct timer_list *t)
int gen_new_estimator(struct gnet_stats_basic_packed *bstats,
struct gnet_stats_basic_cpu __percpu *cpu_bstats,
struct net_rate_estimator __rcu **rate_est,
- spinlock_t *stats_lock,
+ spinlock_t *lock,
seqcount_t *running,
struct nlattr *opt)
{
@@ -154,19 +154,22 @@ int gen_new_estimator(struct gnet_stats_basic_packed *bstats,
seqcount_init(&est->seq);
intvl_log = parm->interval + 2;
est->bstats = bstats;
- est->stats_lock = stats_lock;
+ est->stats_lock = lock;
est->running = running;
est->ewma_log = parm->ewma_log;
est->intvl_log = intvl_log;
est->cpu_bstats = cpu_bstats;
- if (stats_lock)
+ if (lock)
local_bh_disable();
est_fetch_counters(est, &b);
- if (stats_lock)
+ if (lock)
local_bh_enable();
est->last_bytes = b.bytes;
est->last_packets = b.packets;
+
+ if (lock)
+ spin_lock_bh(lock);
old = rcu_dereference_protected(*rate_est, 1);
if (old) {
del_timer_sync(&old->timer);
@@ -179,6 +182,8 @@ int gen_new_estimator(struct gnet_stats_basic_packed *bstats,
mod_timer(&est->timer, est->next_jiffies);
rcu_assign_pointer(*rate_est, est);
+ if (lock)
+ spin_unlock_bh(lock);
if (old)
kfree_rcu(old, rcu);
return 0;
@@ -209,7 +214,7 @@ EXPORT_SYMBOL(gen_kill_estimator);
* @bstats: basic statistics
* @cpu_bstats: bstats per cpu
* @rate_est: rate estimator statistics
- * @stats_lock: statistics lock
+ * @lock: lock for statistics and control path
* @running: qdisc running seqcount (might be NULL)
* @opt: rate estimator configuration TLV
*
@@ -221,11 +226,11 @@ EXPORT_SYMBOL(gen_kill_estimator);
int gen_replace_estimator(struct gnet_stats_basic_packed *bstats,
struct gnet_stats_basic_cpu __percpu *cpu_bstats,
struct net_rate_estimator __rcu **rate_est,
- spinlock_t *stats_lock,
+ spinlock_t *lock,
seqcount_t *running, struct nlattr *opt)
{
return gen_new_estimator(bstats, cpu_bstats, rate_est,
- stats_lock, running, opt);
+ lock, running, opt);
}
EXPORT_SYMBOL(gen_replace_estimator);