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[94.64.206.130]) by smtp.gmail.com with ESMTPSA id v184sm5680854wma.6.2019.03.28.07.47.22 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Thu, 28 Mar 2019 07:47:23 -0700 (PDT) From: Ilias Apalodimas To: brouer@redhat.com, netdev@vger.kernel.org Cc: tariqt@mellanox.com, davem@davemloft.net, toke@redhat.com, mcroce@redhat.com, Ilias Apalodimas Subject: [net-next, PATCH 2/2] net: page_pool: add helper funtion to unmap dma addresses Date: Thu, 28 Mar 2019 16:47:18 +0200 Message-Id: <1553784438-17503-2-git-send-email-ilias.apalodimas@linaro.org> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1553784438-17503-1-git-send-email-ilias.apalodimas@linaro.org> References: <1553784438-17503-1-git-send-email-ilias.apalodimas@linaro.org> Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org The page_pool API has no users for it's DMA capabilities yet. Unmapping DMA addresses used by network drivers will be needed for real users. commit 1567b85eb8ad ("net: page_pool: don't use page->private to store dma_addr_t") uses 'struct page' to store the addresses. This patch provides a helper for unmapping them. Signed-off-by: Ilias Apalodimas Signed-off-by: Jesper Dangaard Brouer --- 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 b885d86..ad218ce 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 897a69a..83b4ba2 100644 --- a/net/core/page_pool.c +++ b/net/core/page_pool.c @@ -189,6 +189,13 @@ 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) { -- 2.7.4