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authorIlias Apalodimas <ilias.apalodimas@linaro.org>2019-02-13 02:55:45 +0100
committerDavid S. Miller <davem@davemloft.net>2019-02-13 22:00:16 -0800
commit1567b85eb8ad2d0fe8d77e50118e876df565d9c7 (patch)
treed7357f5cf9befd591a7fc17bf120a4210d040eac /net/core/page_pool.c
parentc25fff7171bebb76243ccc77f0f04aafa3db87be (diff)
downloadlinux-1567b85eb8ad2d0fe8d77e50118e876df565d9c7.tar.bz2
net: page_pool: don't use page->private to store dma_addr_t
As pointed out by David Miller the current page_pool implementation stores dma_addr_t in page->private. This won't work on 32-bit platforms with 64-bit DMA addresses since the page->private is an unsigned long and the dma_addr_t a u64. A previous patch is adding dma_addr_t on struct page to accommodate this. This patch adapts the page_pool related functions to use the newly added struct for storing and retrieving DMA addresses from network drivers. Signed-off-by: Ilias Apalodimas <ilias.apalodimas@linaro.org> Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/core/page_pool.c')
-rw-r--r--net/core/page_pool.c13
1 files changed, 9 insertions, 4 deletions
diff --git a/net/core/page_pool.c b/net/core/page_pool.c
index 43a932cb609b..897a69a1477e 100644
--- a/net/core/page_pool.c
+++ b/net/core/page_pool.c
@@ -136,7 +136,9 @@ static struct page *__page_pool_alloc_pages_slow(struct page_pool *pool,
if (!(pool->p.flags & PP_FLAG_DMA_MAP))
goto skip_dma_map;
- /* Setup DMA mapping: use page->private for DMA-addr
+ /* Setup DMA mapping: use 'struct page' area for storing DMA-addr
+ * since dma_addr_t can be either 32 or 64 bits and does not always fit
+ * into page private data (i.e 32bit cpu with 64bit DMA caps)
* This mapping is kept for lifetime of page, until leaving pool.
*/
dma = dma_map_page(pool->p.dev, page, 0,
@@ -146,7 +148,7 @@ static struct page *__page_pool_alloc_pages_slow(struct page_pool *pool,
put_page(page);
return NULL;
}
- set_page_private(page, dma); /* page->private = dma; */
+ page->dma_addr = dma;
skip_dma_map:
/* When page just alloc'ed is should/must have refcnt 1. */
@@ -175,13 +177,16 @@ EXPORT_SYMBOL(page_pool_alloc_pages);
static void __page_pool_clean_page(struct page_pool *pool,
struct page *page)
{
+ dma_addr_t dma;
+
if (!(pool->p.flags & PP_FLAG_DMA_MAP))
return;
+ dma = page->dma_addr;
/* DMA unmap */
- dma_unmap_page(pool->p.dev, page_private(page),
+ dma_unmap_page(pool->p.dev, dma,
PAGE_SIZE << pool->p.order, pool->p.dma_dir);
- set_page_private(page, 0);
+ page->dma_addr = 0;
}
/* Return a page to the page allocator, cleaning up our state */