[PATCH net-next v1 02/11] net: page_pool: add helper function to unmap dma addresses

Jesper Dangaard Brouer
2019-06-13T18:28:23Z

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>
---
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)
{