linux-kernel - [RFC 05/19] page_pool: use netmem alloc/put API in __page_pool_alloc_pages

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20250509115126.63190-6-byungchul@sk.com>
Date: Fri,  9 May 2025 20:51:12 +0900
From: Byungchul Park <byungchul@...com>
To: willy@...radead.org,
	netdev@...r.kernel.org
Cc: linux-kernel@...r.kernel.org,
	linux-mm@...ck.org,
	kernel_team@...ynix.com,
	kuba@...nel.org,
	almasrymina@...gle.com,
	ilias.apalodimas@...aro.org,
	harry.yoo@...cle.com,
	hawk@...nel.org,
	akpm@...ux-foundation.org,
	ast@...nel.org,
	daniel@...earbox.net,
	davem@...emloft.net,
	john.fastabend@...il.com,
	andrew+netdev@...n.ch,
	edumazet@...gle.com,
	pabeni@...hat.com,
	vishal.moola@...il.com
Subject: [RFC 05/19] page_pool: use netmem alloc/put API in __page_pool_alloc_pages_slow()

Use netmem alloc/put API instead of page alloc/put API in
__page_pool_alloc_pages_slow().

While at it, improved some comments.

Signed-off-by: Byungchul Park <byungchul@...com>
---
 net/core/page_pool.c | 23 ++++++++++++-----------
 1 file changed, 12 insertions(+), 11 deletions(-)

diff --git a/net/core/page_pool.c b/net/core/page_pool.c
index c03caa11fc606..57ad133e6dc8c 100644
--- a/net/core/page_pool.c
+++ b/net/core/page_pool.c
@@ -531,7 +531,7 @@ static noinline netmem_ref __page_pool_alloc_pages_slow(struct page_pool *pool,
 	unsigned int pp_order = pool->p.order;
 	bool dma_map = pool->dma_map;
 	netmem_ref netmem;
-	int i, nr_pages;
+	int i, nr_netmems;
 
 	/* Don't support bulk alloc for high-order pages */
 	if (unlikely(pp_order))
@@ -541,21 +541,21 @@ static noinline netmem_ref __page_pool_alloc_pages_slow(struct page_pool *pool,
 	if (unlikely(pool->alloc.count > 0))
 		return pool->alloc.cache[--pool->alloc.count];
 
-	/* Mark empty alloc.cache slots "empty" for alloc_pages_bulk */
+	/* Mark empty alloc.cache slots "empty" for alloc_netmems_bulk_node() */
 	memset(&pool->alloc.cache, 0, sizeof(void *) * bulk);
 
-	nr_pages = alloc_pages_bulk_node(gfp, pool->p.nid, bulk,
-					 (struct page **)pool->alloc.cache);
-	if (unlikely(!nr_pages))
+	nr_netmems = alloc_netmems_bulk_node(gfp, pool->p.nid, bulk,
+					   pool->alloc.cache);
+	if (unlikely(!nr_netmems))
 		return 0;
 
-	/* Pages have been filled into alloc.cache array, but count is zero and
-	 * page element have not been (possibly) DMA mapped.
+	/* Netmems have been filled into alloc.cache array, but count is
+	 * zero and elements have not been (possibly) DMA mapped.
 	 */
-	for (i = 0; i < nr_pages; i++) {
+	for (i = 0; i < nr_netmems; i++) {
 		netmem = pool->alloc.cache[i];
 		if (dma_map && unlikely(!page_pool_dma_map(pool, netmem))) {
-			put_page(netmem_to_page(netmem));
+			put_netmem(netmem);
 			continue;
 		}
 
@@ -567,7 +567,7 @@ static noinline netmem_ref __page_pool_alloc_pages_slow(struct page_pool *pool,
 					   pool->pages_state_hold_cnt);
 	}
 
-	/* Return last page */
+	/* Return the last netmem */
 	if (likely(pool->alloc.count > 0)) {
 		netmem = pool->alloc.cache[--pool->alloc.count];
 		alloc_stat_inc(pool, slow);
@@ -575,7 +575,8 @@ static noinline netmem_ref __page_pool_alloc_pages_slow(struct page_pool *pool,
 		netmem = 0;
 	}
 
-	/* When page just alloc'ed is should/must have refcnt 1. */
+	/* When a netmem has been just allocated, it should/must have
+	 * refcnt 1. */
 	return netmem;
 }
 
-- 
2.17.1