netdev - [net-next, PATCH 2/3, v2] net: page_pool: add helper function for retrieving dma direction

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Date:   Sat, 29 Jun 2019 08:23:24 +0300
From:   Ilias Apalodimas <ilias.apalodimas@...aro.org>
To:     netdev@...r.kernel.org, jaswinder.singh@...aro.org
Cc:     ard.biesheuvel@...aro.org, bjorn.topel@...el.com,
        magnus.karlsson@...el.com, brouer@...hat.com, daniel@...earbox.net,
        ast@...nel.org, makita.toshiaki@....ntt.co.jp,
        jakub.kicinski@...ronome.com, john.fastabend@...il.com,
        davem@...emloft.net, maciejromanfijalkowski@...il.com,
        Ilias Apalodimas <ilias.apalodimas@...aro.org>
Subject: [net-next, PATCH 2/3, v2] net: page_pool: add helper function for retrieving dma direction

Since the dma direction is stored in page pool params, offer an API
helper for driver that choose not to keep track of it locally

Signed-off-by: Ilias Apalodimas <ilias.apalodimas@...aro.org>
Acked-by: Jesper Dangaard Brouer <brouer@...hat.com>
---
 include/net/page_pool.h | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/include/net/page_pool.h b/include/net/page_pool.h
index f07c518ef8a5..ee9c871d2043 100644
--- a/include/net/page_pool.h
+++ b/include/net/page_pool.h
@@ -112,6 +112,15 @@ static inline struct page *page_pool_dev_alloc_pages(struct page_pool *pool)
 	return page_pool_alloc_pages(pool, gfp);
 }
 
+/* get the stored dma direction. A driver might decide to treat this locally and
+ * avoid the extra cache line from page_pool to determine the direction
+ */
+static
+inline enum dma_data_direction page_pool_get_dma_dir(struct page_pool *pool)
+{
+	return pool->p.dma_dir;
+}
+
 struct page_pool *page_pool_create(const struct page_pool_params *params);
 
 void __page_pool_free(struct page_pool *pool);
-- 
2.20.1