Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932921Ab0FEKHN (ORCPT ); Sat, 5 Jun 2010 06:07:13 -0400 Received: from mga01.intel.com ([192.55.52.88]:65455 "EHLO mga01.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932846Ab0FEKHJ (ORCPT ); Sat, 5 Jun 2010 06:07:09 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.53,366,1272870000"; d="scan'208";a="804988064" 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, herbert@gondor.hengli.com.au, jdike@linux.intel.com Cc: Xin Xiaohui Subject: [RFC PATCH v7 11/19] Use callback to deal with skb_release_data() specially. Date: Sat, 5 Jun 2010 18:14:50 +0800 Message-Id: <1275732899-5423-11-git-send-email-xiaohui.xin@intel.com> X-Mailer: git-send-email 1.5.4.4 In-Reply-To: <1275732899-5423-10-git-send-email-xiaohui.xin@intel.com> References: <1275732899-5423-1-git-send-email-xiaohui.xin@intel.com> <1275732899-5423-2-git-send-email-xiaohui.xin@intel.com> <1275732899-5423-3-git-send-email-xiaohui.xin@intel.com> <1275732899-5423-4-git-send-email-xiaohui.xin@intel.com> <1275732899-5423-5-git-send-email-xiaohui.xin@intel.com> <1275732899-5423-6-git-send-email-xiaohui.xin@intel.com> <1275732899-5423-7-git-send-email-xiaohui.xin@intel.com> <1275732899-5423-8-git-send-email-xiaohui.xin@intel.com> <1275732899-5423-9-git-send-email-xiaohui.xin@intel.com> <1275732899-5423-10-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: 1612 Lines: 49 From: Xin Xiaohui If buffer is external, then use the callback to destruct buffers. Signed-off-by: Xin Xiaohui Signed-off-by: Zhao Yu Reviewed-by: Jeff Dike --- net/core/skbuff.c | 11 +++++++++++ 1 files changed, 11 insertions(+), 0 deletions(-) diff --git a/net/core/skbuff.c b/net/core/skbuff.c index 37587f0..418457c 100644 --- a/net/core/skbuff.c +++ b/net/core/skbuff.c @@ -385,6 +385,11 @@ static void skb_clone_fraglist(struct sk_buff *skb) static void skb_release_data(struct sk_buff *skb) { + /* check if the skb has external buffers, we have use destructor_arg + * here to indicate + */ + struct skb_external_page *ext_page = skb_shinfo(skb)->destructor_arg; + if (!skb->cloned || !atomic_sub_return(skb->nohdr ? (1 << SKB_DATAREF_SHIFT) + 1 : 1, &skb_shinfo(skb)->dataref)) { @@ -397,6 +402,12 @@ static void skb_release_data(struct sk_buff *skb) if (skb_has_frags(skb)) skb_drop_fraglist(skb); + /* if the skb has external buffers, use destructor here, + * since after that skb->head will be kfree, in case skb->head + * from external buffer cannot use kfree to destroy. + */ + if (dev_is_mpassthru(skb->dev) && ext_page && ext_page->dtor) + ext_page->dtor(ext_page); kfree(skb->head); } } -- 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/