Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754197Ab0DYJRy (ORCPT ); Sun, 25 Apr 2010 05:17:54 -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 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.52,269,1270450800"; d="scan'208";a="561295823" 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: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2157 Lines: 70 From: Xin Xiaohui Currently, it can get external buffers from mp device. Signed-off-by: Xin Xiaohui Signed-off-by: Zhao Yu Reviewed-by: Jeff Dike --- include/linux/skbuff.h | 12 ++++++++++++ net/core/skbuff.c | 16 ++++++++++++++++ 2 files changed, 28 insertions(+), 0 deletions(-) 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) { -- 1.5.4.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/