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page_pool: Add function to batch and return stats 

Adds a function page_pool_get_stats which can be used by drivers to obtain
stats for a specified page_pool.

Signed-off-by: Joe Damato <jdamato@fastly.com>
Acked-by: Jesper Dangaard Brouer <brouer@redhat.com>
Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Joe Damato 2022-03-01 23:55:49 -08:00 committed by David S. Miller
parent ad6fa1e1ab
commit 6b95e3388b
2 changed files with 42 additions and 0 deletions
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17
include/net/page_pool.h
View File

@ -107,6 +107,23 @@ struct page_pool_recycle_stats {
* refcnt
*/
};
/* This struct wraps the above stats structs so users of the
* page_pool_get_stats API can pass a single argument when requesting the
* stats for the page pool.
*/
struct page_pool_stats {
struct page_pool_alloc_stats alloc_stats;
struct page_pool_recycle_stats recycle_stats;
};
/*
* Drivers that wish to harvest page pool stats and report them to users
* (perhaps via ethtool, debugfs, or another mechanism) can allocate a
* struct page_pool_stats call page_pool_get_stats to get stats for the specified pool.
*/
bool page_pool_get_stats(struct page_pool *pool,
struct page_pool_stats *stats);
#endif
struct page_pool {

25
net/core/page_pool.c
View File

@ -35,6 +35,31 @@
struct page_pool_recycle_stats __percpu *s = pool->recycle_stats; \
this_cpu_inc(s->__stat); \
} while (0)
bool page_pool_get_stats(struct page_pool *pool,
struct page_pool_stats *stats)
{
int cpu = 0;
if (!stats)
return false;
memcpy(&stats->alloc_stats, &pool->alloc_stats, sizeof(pool->alloc_stats));
for_each_possible_cpu(cpu) {
const struct page_pool_recycle_stats *pcpu =
per_cpu_ptr(pool->recycle_stats, cpu);
stats->recycle_stats.cached += pcpu->cached;
stats->recycle_stats.cache_full += pcpu->cache_full;
stats->recycle_stats.ring += pcpu->ring;
stats->recycle_stats.ring_full += pcpu->ring_full;
stats->recycle_stats.released_refcnt += pcpu->released_refcnt;
}
return true;
}
EXPORT_SYMBOL(page_pool_get_stats);
#else
#define alloc_stat_inc(pool, __stat)
#define recycle_stat_inc(pool, __stat)