[PATCH v2 net-next] Documentation: update networking/page_pool.rst with ethtool APIs

[Lorenzo Bianconi <lorenzo@kernel.org>]

Update page_pool documentation with page_pool ethtool stats APIs.

Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
---
Changes since v1:
- get rid of literal markup
---
 Documentation/networking/page_pool.rst | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/Documentation/networking/page_pool.rst b/Documentation/networking/page_pool.rst
index 5db8c263b0c6..a40203297cd3 100644
--- a/Documentation/networking/page_pool.rst
+++ b/Documentation/networking/page_pool.rst
@@ -146,6 +146,29 @@ The ``struct page_pool_recycle_stats`` has the following fields:
   * ``ring_full``: page released from page pool because the ptr ring was full
   * ``released_refcnt``: page released (and not recycled) because refcnt > 1
 
+The following APIs can be used to report page_pool stats through ethtool and
+avoid code duplication in each driver:
+
+* page_pool_ethtool_stats_get_strings(): reports page_pool ethtool stats
+  strings according to the struct page_pool_stats
+     * rx_pp_alloc_fast
+     * rx_pp_alloc_slow
+     * rx_pp_alloc_slow_ho
+     * rx_pp_alloc_empty
+     * rx_pp_alloc_refill
+     * rx_pp_alloc_waive
+     * rx_pp_recycle_cached
+     * rx_pp_recycle_cache_full
+     * rx_pp_recycle_ring
+     * rx_pp_recycle_ring_full
+     * rx_pp_recycle_released_ref
+
+* page_pool_ethtool_stats_get_count(): reports the number of stats defined in
+  the ethtool page_pool APIs
+
+* page_pool_ethtool_stats_get(u64 \*data, void \*stats): reports the page_pool statistics accounted in
+  the stats pointer in the ethtool data pointer provided by the caller
+
 Coding examples
 ===============
 
-- 
2.35.3