netdev - [PATCH v3 net-next 1/7] net: page_pool: add helper function to retrieve dma addresses

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Message-Id: <20190605132009.10734-2-ivan.khoronzhuk@linaro.org>
Date:   Wed,  5 Jun 2019 16:20:03 +0300
From:   Ivan Khoronzhuk <ivan.khoronzhuk@...aro.org>
To:     grygorii.strashko@...com, hawk@...nel.org, davem@...emloft.net
Cc:     ast@...nel.org, linux-kernel@...r.kernel.org,
        linux-omap@...r.kernel.org, xdp-newbies@...r.kernel.org,
        ilias.apalodimas@...aro.org, netdev@...r.kernel.org,
        daniel@...earbox.net, jakub.kicinski@...ronome.com,
        john.fastabend@...il.com,
        Jesper Dangaard Brouer <brouer@...hat.com>,
        Ivan Khoronzhuk <ivan.khoronzhuk@...aro.org>
Subject: [PATCH v3 net-next 1/7] net: page_pool: add helper function to retrieve dma addresses

From: Ilias Apalodimas <ilias.apalodimas@...aro.org>

On a previous patch dma addr was stored in 'struct page'.
Use that to retrieve DMA addresses used by network drivers

Signed-off-by: Ilias Apalodimas <ilias.apalodimas@...aro.org>
Signed-off-by: Jesper Dangaard Brouer <brouer@...hat.com>
Signed-off-by: Ivan Khoronzhuk <ivan.khoronzhuk@...aro.org>
---
 include/net/page_pool.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/include/net/page_pool.h b/include/net/page_pool.h
index 694d055e01ef..b885d86cb7a1 100644
--- a/include/net/page_pool.h
+++ b/include/net/page_pool.h
@@ -132,6 +132,11 @@ static inline void page_pool_recycle_direct(struct page_pool *pool,
 	__page_pool_put_page(pool, page, true);
 }
 
+static inline dma_addr_t page_pool_get_dma_addr(struct page *page)
+{
+	return page->dma_addr;
+}
+
 static inline bool is_page_pool_compiled_in(void)
 {
 #ifdef CONFIG_PAGE_POOL
-- 
2.17.1