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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>
This commit is contained in:
Vlad Buslov 2018-08-10 20:51:54 +03:00 committed by David S. Miller
parent 4e232818bd
commit 51a9f5ae65
2 changed files with 15 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
include/net/gen_stats.h
View File

@ -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,

21
net/core/gen_estimator.c
View File

@ -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);