NOTES.
- * The stored value for avbps is scaled by 2^5, so that maximal
- rate is ~1Gbit, avpps is scaled by 2^10.
-
+ * avbps is scaled by 2^5, avpps is scaled by 2^10.
+ * both values are reported as 32 bit unsigned values. bps can
+ overflow for fast links : max speed being 34360Mbit/sec
* Minimal interval is HZ/4=250msec (it is the greatest common divisor
for HZ=100 and HZ=1024 8)), maximal interval
is (HZ*2^EST_MAX_INTERVAL)/4 = 8sec. Shorter intervals
struct gen_estimator
{
struct list_head list;
- struct gnet_stats_basic *bstats;
+ struct gnet_stats_basic_packed *bstats;
struct gnet_stats_rate_est *rate_est;
spinlock_t *stats_lock;
int ewma_log;
u64 last_bytes;
+ u64 avbps;
u32 last_packets;
u32 avpps;
- u32 avbps;
struct rcu_head e_rcu;
struct rb_node node;
};
rcu_read_lock();
list_for_each_entry_rcu(e, &elist[idx].list, list) {
u64 nbytes;
+ u64 brate;
u32 npackets;
u32 rate;
nbytes = e->bstats->bytes;
npackets = e->bstats->packets;
- rate = (nbytes - e->last_bytes)<<(7 - idx);
+ brate = (nbytes - e->last_bytes)<<(7 - idx);
e->last_bytes = nbytes;
- e->avbps += ((long)rate - (long)e->avbps) >> e->ewma_log;
+ e->avbps += (brate >> e->ewma_log) - (e->avbps >> e->ewma_log);
e->rate_est->bps = (e->avbps+0xF)>>5;
rate = (npackets - e->last_packets)<<(12 - idx);
e->last_packets = npackets;
- e->avpps += ((long)rate - (long)e->avpps) >> e->ewma_log;
+ e->avpps += (rate >> e->ewma_log) - (e->avpps >> e->ewma_log);
e->rate_est->pps = (e->avpps+0x1FF)>>10;
skip:
read_unlock(&est_lock);
rb_insert_color(&est->node, &est_root);
}
-static struct gen_estimator *gen_find_node(struct gnet_stats_basic *bstats,
- struct gnet_stats_rate_est *rate_est)
+static
+struct gen_estimator *gen_find_node(const struct gnet_stats_basic_packed *bstats,
+ const struct gnet_stats_rate_est *rate_est)
{
struct rb_node *p = est_root.rb_node;
*
* NOTE: Called under rtnl_mutex
*/
-int gen_new_estimator(struct gnet_stats_basic *bstats,
+int gen_new_estimator(struct gnet_stats_basic_packed *bstats,
struct gnet_stats_rate_est *rate_est,
spinlock_t *stats_lock,
struct nlattr *opt)
*
* NOTE: Called under rtnl_mutex
*/
-void gen_kill_estimator(struct gnet_stats_basic *bstats,
+void gen_kill_estimator(struct gnet_stats_basic_packed *bstats,
struct gnet_stats_rate_est *rate_est)
{
struct gen_estimator *e;
*
* Returns 0 on success or a negative error code.
*/
-int gen_replace_estimator(struct gnet_stats_basic *bstats,
+int gen_replace_estimator(struct gnet_stats_basic_packed *bstats,
struct gnet_stats_rate_est *rate_est,
spinlock_t *stats_lock, struct nlattr *opt)
{
/**
* gen_estimator_active - test if estimator is currently in use
+ * @bstats: basic statistics
* @rate_est: rate estimator statistics
*
- * Returns 1 if estimator is active, and 0 if not.
+ * Returns true if estimator is active, and false if not.
*/
-int gen_estimator_active(const struct gnet_stats_rate_est *rate_est)
+bool gen_estimator_active(const struct gnet_stats_basic_packed *bstats,
+ const struct gnet_stats_rate_est *rate_est)
{
- int idx;
- struct gen_estimator *e;
-
ASSERT_RTNL();
- for (idx=0; idx <= EST_MAX_INTERVAL; idx++) {
- if (!elist[idx].timer.function)
- continue;
-
- list_for_each_entry(e, &elist[idx].list, list) {
- if (e->rate_est == rate_est)
- return 1;
- }
- }
- return 0;
+ return gen_find_node(bstats, rate_est) != NULL;
}
EXPORT_SYMBOL(gen_estimator_active);