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page_pool: keep pp info as long as page pool owns the page

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Currently, page->pp is cleared and set everytime the page
is recycled, which is unnecessary.

So only set the page->pp when the page is added to the page
pool and only clear it when the page is released from the
page pool.

This is also a preparation to support allocating frag page
in page pool.

Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Signed-off-by: Yunsheng Lin <linyunsheng@huawei.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Yunsheng Lin
2021-08-06 10:46:19 +08:00
committed by Jakub Kicinski
parent 2a2b6e3640
commit 57f05bc2ab
7 changed files with 22 additions and 22 deletions
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21
net/core/page_pool.c
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@@ -206,6 +206,19 @@ static bool page_pool_dma_map(struct page_pool *pool, struct page *page)
return true;
}
static void page_pool_set_pp_info(struct page_pool *pool,
struct page *page)
{
page->pp = pool;
page->pp_magic |= PP_SIGNATURE;
}
static void page_pool_clear_pp_info(struct page *page)
{
page->pp_magic = 0;
page->pp = NULL;
}
static struct page *__page_pool_alloc_page_order(struct page_pool *pool,
gfp_t gfp)
{
@@ -222,7 +235,7 @@ static struct page *__page_pool_alloc_page_order(struct page_pool *pool,
return NULL;
}
page->pp_magic |= PP_SIGNATURE;
page_pool_set_pp_info(pool, page);
/* Track how many pages are held 'in-flight' */
pool->pages_state_hold_cnt++;
@@ -266,7 +279,8 @@ static struct page *__page_pool_alloc_pages_slow(struct page_pool *pool,
put_page(page);
continue;
}
page->pp_magic |= PP_SIGNATURE;
page_pool_set_pp_info(pool, page);
pool->alloc.cache[pool->alloc.count++] = page;
/* Track how many pages are held 'in-flight' */
pool->pages_state_hold_cnt++;
@@ -345,7 +359,7 @@ void page_pool_release_page(struct page_pool *pool, struct page *page)
DMA_ATTR_SKIP_CPU_SYNC);
page_pool_set_dma_addr(page, 0);
skip_dma_unmap:
page->pp_magic = 0;
page_pool_clear_pp_info(page);
/* This may be the last page returned, releasing the pool, so
* it is not safe to reference pool afterwards.
@@ -644,7 +658,6 @@ bool page_pool_return_skb_page(struct page *page)
* The page will be returned to the pool here regardless of the
* 'flipped' fragment being in use or not.
*/
page->pp = NULL;
page_pool_put_full_page(pp, page, false);
return true;