From 4321de4497b24fbf22389331f4ecd4039a451aa9 Mon Sep 17 00:00:00 2001 From: Alexander Lobakin Date: Tue, 7 May 2024 13:20:25 +0200 Subject: [PATCH] page_pool: check for DMA sync shortcut earlier We can save a couple more function calls in the Page Pool code if we check for dma_need_sync() earlier, just when we test pp->p.dma_sync. Move both these checks into an inline wrapper and call the PP wrapper over the generic DMA sync function only when both are true. You can't cache the result of dma_need_sync() in &page_pool, as it may change anytime if an SWIOTLB buffer is allocated or mapped. Signed-off-by: Alexander Lobakin Signed-off-by: Christoph Hellwig --- net/core/page_pool.c | 33 +++++++++++++++++++-------------- 1 file changed, 19 insertions(+), 14 deletions(-) diff --git a/net/core/page_pool.c b/net/core/page_pool.c index c2819ff03dd25..4f9d1bd7f4d18 100644 --- a/net/core/page_pool.c +++ b/net/core/page_pool.c @@ -398,16 +398,26 @@ static struct page *__page_pool_get_cached(struct page_pool *pool) return page; } -static void page_pool_dma_sync_for_device(struct page_pool *pool, - struct page *page, - unsigned int dma_sync_size) +static void __page_pool_dma_sync_for_device(const struct page_pool *pool, + struct page *page, + u32 dma_sync_size) { +#if defined(CONFIG_HAS_DMA) && defined(CONFIG_DMA_NEED_SYNC) dma_addr_t dma_addr = page_pool_get_dma_addr(page); dma_sync_size = min(dma_sync_size, pool->p.max_len); - dma_sync_single_range_for_device(pool->p.dev, dma_addr, - pool->p.offset, dma_sync_size, - pool->p.dma_dir); + __dma_sync_single_for_device(pool->p.dev, dma_addr + pool->p.offset, + dma_sync_size, pool->p.dma_dir); +#endif +} + +static __always_inline void +page_pool_dma_sync_for_device(const struct page_pool *pool, + struct page *page, + u32 dma_sync_size) +{ + if (pool->dma_sync && dma_dev_need_sync(pool->p.dev)) + __page_pool_dma_sync_for_device(pool, page, dma_sync_size); } static bool page_pool_dma_map(struct page_pool *pool, struct page *page) @@ -429,8 +439,7 @@ static bool page_pool_dma_map(struct page_pool *pool, struct page *page) if (page_pool_set_dma_addr(page, dma)) goto unmap_failed; - if (pool->dma_sync) - page_pool_dma_sync_for_device(pool, page, pool->p.max_len); + page_pool_dma_sync_for_device(pool, page, pool->p.max_len); return true; @@ -699,9 +708,7 @@ __page_pool_put_page(struct page_pool *pool, struct page *page, if (likely(__page_pool_page_can_be_recycled(page))) { /* Read barrier done in page_ref_count / READ_ONCE */ - if (pool->dma_sync) - page_pool_dma_sync_for_device(pool, page, - dma_sync_size); + page_pool_dma_sync_for_device(pool, page, dma_sync_size); if (allow_direct && in_softirq() && page_pool_recycle_in_cache(page, pool)) @@ -812,9 +819,7 @@ static struct page *page_pool_drain_frag(struct page_pool *pool, return NULL; if (__page_pool_page_can_be_recycled(page)) { - if (pool->dma_sync) - page_pool_dma_sync_for_device(pool, page, -1); - + page_pool_dma_sync_for_device(pool, page, -1); return page; } -- 2.30.2