netdev - [RFC PATCH v3 01/20] net: page_pool: add ppiov mangling helper

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Date: Tue, 19 Dec 2023 13:03:38 -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 01/20] net: page_pool: add ppiov mangling helper

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

NOT FOR UPSTREAM

The final version will depend on how ppiov looks like, but add a
convenience helper for now.

Signed-off-by: Pavel Begunkov <asml.silence@...il.com>
Signed-off-by: David Wei <dw@...idwei.uk>
---
 include/net/page_pool/helpers.h | 5 +++++
 net/core/page_pool.c            | 2 +-
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/include/net/page_pool/helpers.h b/include/net/page_pool/helpers.h
index 95f4d579cbc4..92804c499833 100644
--- a/include/net/page_pool/helpers.h
+++ b/include/net/page_pool/helpers.h
@@ -86,6 +86,11 @@ static inline u64 *page_pool_ethtool_stats_get(u64 *data, void *stats)
 
 /* page_pool_iov support */
 
+static inline struct page *page_pool_mangle_ppiov(struct page_pool_iov *ppiov)
+{
+	return (struct page *)((unsigned long)ppiov | PP_DEVMEM);
+}
+
 static inline struct dmabuf_genpool_chunk_owner *
 page_pool_iov_owner(const struct page_pool_iov *ppiov)
 {
diff --git a/net/core/page_pool.c b/net/core/page_pool.c
index c0bc62ee77c6..38eff947f679 100644
--- a/net/core/page_pool.c
+++ b/net/core/page_pool.c
@@ -1074,7 +1074,7 @@ static struct page *mp_dmabuf_devmem_alloc_pages(struct page_pool *pool,
 	pool->pages_state_hold_cnt++;
 	trace_page_pool_state_hold(pool, (struct page *)ppiov,
 				   pool->pages_state_hold_cnt);
-	return (struct page *)((unsigned long)ppiov | PP_DEVMEM);
+	return page_pool_mangle_ppiov(ppiov);
 }
 
 static void mp_dmabuf_devmem_destroy(struct page_pool *pool)
-- 
2.39.3