net: page_pool: API cleanup and comments

Functions starting with __ usually indicate those which are exported,
but should not be called directly. Update some of those declared in the
API and make it more readable.

page_pool_unmap_page() and page_pool_release_page() were doing
exactly the same thing calling __page_pool_clean_page().  Let's
rename __page_pool_clean_page() to page_pool_release_page() and
export it in order to show up on perf logs and get rid of
page_pool_unmap_page().

Finally rename __page_pool_put_page() to page_pool_put_page() since we
can now directly call it from drivers and rename the existing
page_pool_put_page() to page_pool_put_full_page() since they do the same
thing but the latter is trying to sync the full DMA area.

This patch also updates netsec, mvneta and stmmac drivers which use
those functions.

Suggested-by: Jonathan Lemon <jonathan.lemon@gmail.com>
Acked-by: Toke Høiland-Jørgensen <toke@redhat.com>
Acked-by: Jesper Dangaard Brouer <brouer@redhat.com>
Signed-off-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 37 insertions, 33 deletions

diff --git a/net/core/page_pool.c b/net/core/page_pool.c
index 10d2b255df5e..626db912fce4 100644
--- a/net/core/page_pool.c
+++ b/net/core/page_pool.c
@@ -96,7 +96,7 @@ struct page_pool *page_pool_create(const struct page_pool_params *params)
 }
 EXPORT_SYMBOL(page_pool_create);
 
-static void __page_pool_return_page(struct page_pool *pool, struct page *page);
+static void page_pool_return_page(struct page_pool *pool, struct page *page);
 
 noinline
 static struct page *page_pool_refill_alloc_cache(struct page_pool *pool)
@@ -136,7 +136,7 @@ static struct page *page_pool_refill_alloc_cache(struct page_pool *pool)
 			 * (2) break out to fallthrough to alloc_pages_node.
 			 * This limit stress on page buddy alloactor.
 			 */
-			__page_pool_return_page(pool, page);
+			page_pool_return_page(pool, page);
 			page = NULL;
 			break;
 		}
@@ -274,18 +274,25 @@ static s32 page_pool_inflight(struct page_pool *pool)
 	return inflight;
 }
 
-/* Cleanup page_pool state from page */
-static void __page_pool_clean_page(struct page_pool *pool,
-				   struct page *page)
+/* Disconnects a page (from a page_pool).  API users can have a need
+ * to disconnect a page (from a page_pool), to allow it to be used as
+ * a regular page (that will eventually be returned to the normal
+ * page-allocator via put_page).
+ */
+void page_pool_release_page(struct page_pool *pool, struct page *page)
 {
 	dma_addr_t dma;
 	int count;
 
 	if (!(pool->p.flags & PP_FLAG_DMA_MAP))
+		/* Always account for inflight pages, even if we didn't
+		 * map them
+		 */
 		goto skip_dma_unmap;
 
 	dma = page->dma_addr;
-	/* DMA unmap */
+
+	/* When page is unmapped, it cannot be returned our pool */
 	dma_unmap_page_attrs(pool->p.dev, dma,
 			     PAGE_SIZE << pool->p.order, pool->p.dma_dir,
 			     DMA_ATTR_SKIP_CPU_SYNC);
@@ -297,21 +304,12 @@ skip_dma_unmap:
 	count = atomic_inc_return(&pool->pages_state_release_cnt);
 	trace_page_pool_state_release(pool, page, count);
 }
-
-/* unmap the page and clean our state */
-void page_pool_unmap_page(struct page_pool *pool, struct page *page)
-{
-	/* When page is unmapped, this implies page will not be
-	 * returned to page_pool.
-	 */
-	__page_pool_clean_page(pool, page);
-}
-EXPORT_SYMBOL(page_pool_unmap_page);
+EXPORT_SYMBOL(page_pool_release_page);
 
 /* Return a page to the page allocator, cleaning up our state */
-static void __page_pool_return_page(struct page_pool *pool, struct page *page)
+static void page_pool_return_page(struct page_pool *pool, struct page *page)
 {
-	__page_pool_clean_page(pool, page);
+	page_pool_release_page(pool, page);
 
 	put_page(page);
 	/* An optimization would be to call __free_pages(page, pool->p.order)
@@ -320,8 +318,7 @@ static void __page_pool_return_page(struct page_pool *pool, struct page *page)
 	 */
 }
 
-static bool __page_pool_recycle_into_ring(struct page_pool *pool,
-				   struct page *page)
+static bool page_pool_recycle_in_ring(struct page_pool *pool, struct page *page)
 {
 	int ret;
 	/* BH protection not needed if current is serving softirq */
@@ -338,7 +335,7 @@ static bool __page_pool_recycle_into_ring(struct page_pool *pool,
  *
  * Caller must provide appropriate safe context.
  */
-static bool __page_pool_recycle_direct(struct page *page,
+static bool page_pool_recycle_in_cache(struct page *page,
 				       struct page_pool *pool)
 {
 	if (unlikely(pool->alloc.count == PP_ALLOC_CACHE_SIZE))
@@ -357,8 +354,14 @@ static bool pool_page_reusable(struct page_pool *pool, struct page *page)
 	return !page_is_pfmemalloc(page);
 }
 
-void __page_pool_put_page(struct page_pool *pool, struct page *page,
-			  unsigned int dma_sync_size, bool allow_direct)
+/* If the page refcnt == 1, this will try to recycle the page.
+ * if PP_FLAG_DMA_SYNC_DEV is set, we'll try to sync the DMA area for
+ * the configured size min(dma_sync_size, pool->max_len).
+ * If the page refcnt != 1, then the page will be returned to memory
+ * subsystem.
+ */
+void page_pool_put_page(struct page_pool *pool, struct page *page,
+			unsigned int dma_sync_size, bool allow_direct)
 {
 	/* This allocator is optimized for the XDP mode that uses
 	 * one-frame-per-page, but have fallbacks that act like the
@@ -375,12 +378,12 @@ void __page_pool_put_page(struct page_pool *pool, struct page *page,
 						      dma_sync_size);
 
 		if (allow_direct && in_serving_softirq())
-			if (__page_pool_recycle_direct(page, pool))
+			if (page_pool_recycle_in_cache(page, pool))
 				return;
 
-		if (!__page_pool_recycle_into_ring(pool, page)) {
+		if (!page_pool_recycle_in_ring(pool, page)) {
 			/* Cache full, fallback to free pages */
-			__page_pool_return_page(pool, page);
+			page_pool_return_page(pool, page);
 		}
 		return;
 	}
@@ -397,12 +400,13 @@ void __page_pool_put_page(struct page_pool *pool, struct page *page,
 	 * doing refcnt based recycle tricks, meaning another process
 	 * will be invoking put_page.
 	 */
-	__page_pool_clean_page(pool, page);
+	/* Do not replace this with page_pool_return_page() */
+	page_pool_release_page(pool, page);
 	put_page(page);
 }
-EXPORT_SYMBOL(__page_pool_put_page);
+EXPORT_SYMBOL(page_pool_put_page);
 
-static void __page_pool_empty_ring(struct page_pool *pool)
+static void page_pool_empty_ring(struct page_pool *pool)
 {
 	struct page *page;
 
@@ -413,7 +417,7 @@ static void __page_pool_empty_ring(struct page_pool *pool)
 			pr_crit("%s() page_pool refcnt %d violation\n",
 				__func__, page_ref_count(page));
 
-		__page_pool_return_page(pool, page);
+		page_pool_return_page(pool, page);
 	}
 }
 
@@ -443,7 +447,7 @@ static void page_pool_empty_alloc_cache_once(struct page_pool *pool)
 	 */
 	while (pool->alloc.count) {
 		page = pool->alloc.cache[--pool->alloc.count];
-		__page_pool_return_page(pool, page);
+		page_pool_return_page(pool, page);
 	}
 }
 
@@ -455,7 +459,7 @@ static void page_pool_scrub(struct page_pool *pool)
 	/* No more consumers should exist, but producers could still
 	 * be in-flight.
 	 */
-	__page_pool_empty_ring(pool);
+	page_pool_empty_ring(pool);
 }
 
 static int page_pool_release(struct page_pool *pool)
@@ -529,7 +533,7 @@ void page_pool_update_nid(struct page_pool *pool, int new_nid)
 	/* Flush pool alloc cache, as refill will check NUMA node */
 	while (pool->alloc.count) {
 		page = pool->alloc.cache[--pool->alloc.count];
-		__page_pool_return_page(pool, page);
+		page_pool_return_page(pool, page);
 	}
 }
 EXPORT_SYMBOL(page_pool_update_nid);