From patchwork Wed Feb 24 18:56:41 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jesper Dangaard Brouer X-Patchwork-Id: 12102279 X-Patchwork-Delegate: kuba@kernel.org Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-15.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id B230DC433E0 for ; Wed, 24 Feb 2021 18:59:15 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5D14964F11 for ; Wed, 24 Feb 2021 18:59:15 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235677AbhBXS66 (ORCPT ); Wed, 24 Feb 2021 13:58:58 -0500 Received: from us-smtp-delivery-124.mimecast.com ([216.205.24.124]:55788 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235750AbhBXS6N (ORCPT ); Wed, 24 Feb 2021 13:58:13 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1614193006; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=SA3Llh8vILJh1ORZtfVQcGyaHvHK4xGRwPJ760zHgnI=; b=CuQdz6mu0/zcFi5FS9SJqeXLzWWayMcyDKO9KCOVsQZhKrFmy7nJC3qQ+Ufj6X1H8tL8Sn wBGdjbhI+HJ8z9B30GE2EMCm0njSbu4ihS2CmqF3gkuQz7Drpfp+qh1y7gtB9lj1AzpMr1 BL/WPRMLcSIO2rFDJ2EREVLickCLaRE= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-457-BKWPuBlyMWCn288FLnXnWA-1; Wed, 24 Feb 2021 13:56:44 -0500 X-MC-Unique: BKWPuBlyMWCn288FLnXnWA-1 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.11]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id C09B0107ACF3; Wed, 24 Feb 2021 18:56:42 +0000 (UTC) Received: from firesoul.localdomain (unknown [10.40.208.7]) by smtp.corp.redhat.com (Postfix) with ESMTP id 42AD69CA0; Wed, 24 Feb 2021 18:56:42 +0000 (UTC) Received: from [192.168.42.3] (localhost [IPv6:::1]) by firesoul.localdomain (Postfix) with ESMTP id 27A7D30736C73; Wed, 24 Feb 2021 19:56:41 +0100 (CET) Subject: [PATCH RFC net-next 1/3] net: page_pool: refactor dma_map into own function page_pool_dma_map From: Jesper Dangaard Brouer To: Mel Gorman , linux-mm@kvack.org Cc: Jesper Dangaard Brouer , chuck.lever@oracle.com, netdev@vger.kernel.org, linux-nfs@vger.kernel.org, linux-kernel@vger.kernel.org Date: Wed, 24 Feb 2021 19:56:41 +0100 Message-ID: <161419300107.2718959.18302883670835746249.stgit@firesoul> In-Reply-To: <161419296941.2718959.12575257358107256094.stgit@firesoul> References: <161419296941.2718959.12575257358107256094.stgit@firesoul> User-Agent: StGit/0.19 MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org X-Patchwork-State: RFC In preparation for next patch, move the dma mapping into its own function, as this will make it easier to follow the changes. Signed-off-by: Jesper Dangaard Brouer --- net/core/page_pool.c | 49 +++++++++++++++++++++++++++++-------------------- 1 file changed, 29 insertions(+), 20 deletions(-) diff --git a/net/core/page_pool.c b/net/core/page_pool.c index ad8b0707af04..50d52aa6fbeb 100644 --- a/net/core/page_pool.c +++ b/net/core/page_pool.c @@ -180,6 +180,31 @@ static void page_pool_dma_sync_for_device(struct page_pool *pool, pool->p.dma_dir); } +static struct page * page_pool_dma_map(struct page_pool *pool, + struct page *page) +{ + dma_addr_t dma; + + /* 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_attrs(pool->p.dev, page, 0, + (PAGE_SIZE << pool->p.order), + pool->p.dma_dir, DMA_ATTR_SKIP_CPU_SYNC); + if (dma_mapping_error(pool->p.dev, dma)) { + put_page(page); + return NULL; + } + page->dma_addr = dma; + + if (pool->p.flags & PP_FLAG_DMA_SYNC_DEV) + page_pool_dma_sync_for_device(pool, page, pool->p.max_len); + + return page; +} + /* slow path */ noinline static struct page *__page_pool_alloc_pages_slow(struct page_pool *pool, @@ -187,7 +212,6 @@ static struct page *__page_pool_alloc_pages_slow(struct page_pool *pool, { struct page *page; gfp_t gfp = _gfp; - dma_addr_t dma; /* We could always set __GFP_COMP, and avoid this branch, as * prep_new_page() can handle order-0 with __GFP_COMP. @@ -211,27 +235,12 @@ static struct page *__page_pool_alloc_pages_slow(struct page_pool *pool, if (!page) return NULL; - if (!(pool->p.flags & PP_FLAG_DMA_MAP)) - goto skip_dma_map; - - /* 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_attrs(pool->p.dev, page, 0, - (PAGE_SIZE << pool->p.order), - pool->p.dma_dir, DMA_ATTR_SKIP_CPU_SYNC); - if (dma_mapping_error(pool->p.dev, dma)) { - put_page(page); - return NULL; + if (pool->p.flags & PP_FLAG_DMA_MAP) { + page = page_pool_dma_map(pool, page); + if (!page) + return NULL; } - page->dma_addr = dma; - - if (pool->p.flags & PP_FLAG_DMA_SYNC_DEV) - page_pool_dma_sync_for_device(pool, page, pool->p.max_len); -skip_dma_map: /* Track how many pages are held 'in-flight' */ pool->pages_state_hold_cnt++;