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From:   Ivan Khoronzhuk <ivan.khoronzhuk@linaro.org>
To:     grygorii.strashko@ti.com, hawk@kernel.org, davem@davemloft.net
Cc:     ast@kernel.org, linux-kernel@vger.kernel.org,
        linux-omap@vger.kernel.org, xdp-newbies@vger.kernel.org,
        ilias.apalodimas@linaro.org, netdev@vger.kernel.org,
        daniel@iogearbox.net, jakub.kicinski@netronome.com,
        john.fastabend@gmail.com,
        Jesper Dangaard Brouer <brouer@redhat.com>,
        Ivan Khoronzhuk <ivan.khoronzhuk@linaro.org>
Subject: [PATCH v2 net-next 2/7] net: page_pool: add helper function to unmap dma addresses
Date:   Thu, 30 May 2019 21:20:34 +0300
Message-Id: <20190530182039.4945-3-ivan.khoronzhuk@linaro.org>
In-Reply-To: <20190530182039.4945-1-ivan.khoronzhuk@linaro.org>
References: <20190530182039.4945-1-ivan.khoronzhuk@linaro.org>
Sender: linux-kernel-owner@vger.kernel.org
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From: Ilias Apalodimas <ilias.apalodimas@linaro.org>

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

Signed-off-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
Signed-off-by: Ivan Khoronzhuk <ivan.khoronzhuk@linaro.org>
---
 include/net/page_pool.h | 1 +
 net/core/page_pool.c    | 7 +++++++
 2 files changed, 8 insertions(+)

diff --git a/include/net/page_pool.h b/include/net/page_pool.h
index b885d86cb7a1..ad218cef88c5 100644
--- a/include/net/page_pool.h
+++ b/include/net/page_pool.h
@@ -110,6 +110,7 @@ static inline struct page *page_pool_dev_alloc_pages(struct page_pool *pool)
 struct page_pool *page_pool_create(const struct page_pool_params *params);
 
 void page_pool_destroy(struct page_pool *pool);
+void page_pool_unmap_page(struct page_pool *pool, struct page *page);
 
 /* Never call this directly, use helpers below */
 void __page_pool_put_page(struct page_pool *pool,
diff --git a/net/core/page_pool.c b/net/core/page_pool.c
index 5b2252c6d49b..205af7bd6d09 100644
--- a/net/core/page_pool.c
+++ b/net/core/page_pool.c
@@ -190,6 +190,13 @@ static void __page_pool_clean_page(struct page_pool *pool,
 	page->dma_addr = 0;
 }
 
+/* unmap the page and clean our state */
+void page_pool_unmap_page(struct page_pool *pool, struct page *page)
+{
+	__page_pool_clean_page(pool, page);
+}
+EXPORT_SYMBOL(page_pool_unmap_page);
+
 /* Return a page to the page allocator, cleaning up our state */
 static void __page_pool_return_page(struct page_pool *pool, struct page *page)
 {
-- 
2.17.1