From patchwork Sun Apr 25 09:19:53 2010 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Xin, Xiaohui" X-Patchwork-Id: 94916 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by demeter.kernel.org (8.14.3/8.14.3) with ESMTP id o3P9LrGo030605 for ; Sun, 25 Apr 2010 09:21:54 GMT Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753391Ab0DYJRf (ORCPT ); Sun, 25 Apr 2010 05:17:35 -0400 Received: from mga11.intel.com ([192.55.52.93]:14281 "EHLO mga11.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752808Ab0DYJRR (ORCPT ); Sun, 25 Apr 2010 05:17:17 -0400 Received: from fmsmga002.fm.intel.com ([10.253.24.26]) by fmsmga102.fm.intel.com with ESMTP; 25 Apr 2010 02:16:00 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.52,269,1270450800"; d="scan'208";a="561295823" Received: from unknown (HELO localhost.localdomain) ([10.239.36.200]) by fmsmga002.fm.intel.com with ESMTP; 25 Apr 2010 02:16:29 -0700 From: xiaohui.xin@intel.com To: netdev@vger.kernel.org, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, mst@redhat.com, mingo@elte.hu, davem@davemloft.net, jdike@linux.intel.com Cc: Xin Xiaohui Subject: [RFC][PATCH v4 06/18] Add interface to get external buffers. Date: Sun, 25 Apr 2010 17:19:53 +0800 Message-Id: <1272187206-18534-6-git-send-email-xiaohui.xin@intel.com> X-Mailer: git-send-email 1.5.4.4 In-Reply-To: <1272187206-18534-5-git-send-email-xiaohui.xin@intel.com> References: <1272187206-18534-1-git-send-email-xiaohui.xin@intel.com> <1272187206-18534-2-git-send-email-xiaohui.xin@intel.com> <1272187206-18534-3-git-send-email-xiaohui.xin@intel.com> <1272187206-18534-4-git-send-email-xiaohui.xin@intel.com> <1272187206-18534-5-git-send-email-xiaohui.xin@intel.com> Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org X-Greylist: IP, sender and recipient auto-whitelisted, not delayed by milter-greylist-4.2.3 (demeter.kernel.org [140.211.167.41]); Sun, 25 Apr 2010 09:21:54 +0000 (UTC) diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h index 3104e7d..96799f5 100644 --- a/include/linux/skbuff.h +++ b/include/linux/skbuff.h @@ -1525,6 +1525,18 @@ static inline void netdev_free_page(struct net_device *dev, struct page *page) __free_page(page); } +extern struct skb_external_page *netdev_alloc_external_pages( + struct net_device *dev, + struct sk_buff *skb, int npages); + +static inline struct skb_external_page *netdev_alloc_external_page( + struct net_device *dev, + struct sk_buff *skb, unsigned int size) +{ + return netdev_alloc_external_pages(dev, skb, + DIV_ROUND_UP(size, PAGE_SIZE)); +} + /** * skb_clone_writable - is the header of a clone writable * @skb: buffer to check diff --git a/net/core/skbuff.c b/net/core/skbuff.c index 93c4e06..6345acc 100644 --- a/net/core/skbuff.c +++ b/net/core/skbuff.c @@ -278,6 +278,22 @@ struct page *__netdev_alloc_page(struct net_device *dev, gfp_t gfp_mask) } EXPORT_SYMBOL(__netdev_alloc_page); +struct skb_external_page *netdev_alloc_external_pages(struct net_device *dev, + struct sk_buff *skb, int npages) +{ + struct mpassthru_port *port; + struct skb_external_page *ext_page = NULL; + + port = rcu_dereference(dev->mp_port); + if (!port) + goto out; + BUG_ON(npages > port->npages); + ext_page = port->ctor(port, skb, npages); +out: + return ext_page; +} +EXPORT_SYMBOL(netdev_alloc_external_pages); + void skb_add_rx_frag(struct sk_buff *skb, int i, struct page *page, int off, int size) {