netdev - [RFC PATCH v3 04/20] net: enable napi_pp_put

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Date: Tue, 19 Dec 2023 13:03:41 -0800
From: David Wei <dw@...idwei.uk>
To: io-uring@...r.kernel.org,
	netdev@...r.kernel.org
Cc: Jens Axboe <axboe@...nel.dk>,
	Pavel Begunkov <asml.silence@...il.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jesper Dangaard Brouer <hawk@...nel.org>,
	David Ahern <dsahern@...nel.org>,
	Mina Almasry <almasrymina@...gle.com>
Subject: [RFC PATCH v3 04/20] net: enable napi_pp_put_page for ppiov

From: Pavel Begunkov <asml.silence@...il.com>

NOT FOR UPSTREAM

Teach napi_pp_put_page() how to work with ppiov.

Signed-off-by: Pavel Begunkov <asml.silence@...il.com>
Signed-off-by: David Wei <dw@...idwei.uk>
---
 include/net/page_pool/helpers.h |  2 +-
 net/core/page_pool.c            |  3 ---
 net/core/skbuff.c               | 28 ++++++++++++++++------------
 3 files changed, 17 insertions(+), 16 deletions(-)

diff --git a/include/net/page_pool/helpers.h b/include/net/page_pool/helpers.h
index ef380ee8f205..aca3a52d0e22 100644
--- a/include/net/page_pool/helpers.h
+++ b/include/net/page_pool/helpers.h
@@ -381,7 +381,7 @@ static inline long page_pool_defrag_page(struct page *page, long nr)
 	long ret;
 
 	if (page_is_page_pool_iov(page))
-		return -EINVAL;
+		return 0;
 
 	/* If nr == pp_frag_count then we have cleared all remaining
 	 * references to the page:
diff --git a/net/core/page_pool.c b/net/core/page_pool.c
index ecf90a1ccabe..71af9835638e 100644
--- a/net/core/page_pool.c
+++ b/net/core/page_pool.c
@@ -922,9 +922,6 @@ static void page_pool_empty_alloc_cache_once(struct page_pool *pool)
 {
 	struct page *page;
 
-	if (pool->destroy_cnt)
-		return;
-
 	/* Empty alloc cache, assume caller made sure this is
 	 * no-longer in use, and page_pool_alloc_pages() cannot be
 	 * call concurrently.
diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index f44c53b0ca27..cf523d655f92 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -896,19 +896,23 @@ bool napi_pp_put_page(struct page *page, bool napi_safe)
 	bool allow_direct = false;
 	struct page_pool *pp;
 
-	page = compound_head(page);
-
-	/* page->pp_magic is OR'ed with PP_SIGNATURE after the allocation
-	 * in order to preserve any existing bits, such as bit 0 for the
-	 * head page of compound page and bit 1 for pfmemalloc page, so
-	 * mask those bits for freeing side when doing below checking,
-	 * and page_is_pfmemalloc() is checked in __page_pool_put_page()
-	 * to avoid recycling the pfmemalloc page.
-	 */
-	if (unlikely((page->pp_magic & ~0x3UL) != PP_SIGNATURE))
-		return false;
+	if (page_is_page_pool_iov(page)) {
+		pp = page_to_page_pool_iov(page)->pp;
+	} else {
+		page = compound_head(page);
+
+		/* page->pp_magic is OR'ed with PP_SIGNATURE after the allocation
+		 * in order to preserve any existing bits, such as bit 0 for the
+		 * head page of compound page and bit 1 for pfmemalloc page, so
+		 * mask those bits for freeing side when doing below checking,
+		 * and page_is_pfmemalloc() is checked in __page_pool_put_page()
+		 * to avoid recycling the pfmemalloc page.
+		 */
+		if (unlikely((page->pp_magic & ~0x3UL) != PP_SIGNATURE))
+			return false;
 
-	pp = page->pp;
+		pp = page->pp;
+	}
 
 	/* Allow direct recycle if we have reasons to believe that we are
 	 * in the same context as the consumer would run, so there's
-- 
2.39.3