From patchwork Thu Nov 4 09:05:07 2010 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Xin, Xiaohui" X-Patchwork-Id: 301432 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by demeter1.kernel.org (8.14.4/8.14.3) with ESMTP id oA48m6DH010326 for ; Thu, 4 Nov 2010 08:48:07 GMT Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754871Ab0KDIqz (ORCPT ); Thu, 4 Nov 2010 04:46:55 -0400 Received: from mga02.intel.com ([134.134.136.20]:37868 "EHLO mga02.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754430Ab0KDIoP (ORCPT ); Thu, 4 Nov 2010 04:44:15 -0400 Received: from orsmga002.jf.intel.com ([10.7.209.21]) by orsmga101.jf.intel.com with ESMTP; 04 Nov 2010 01:44:14 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.58,294,1286175600"; d="scan'208";a="570251218" Received: from gw-vmm.sh.intel.com (HELO localhost.localdomain.org) ([10.239.48.110]) by orsmga002.jf.intel.com with ESMTP; 04 Nov 2010 01:44:12 -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, herbert@gondor.hengli.com.au, jdike@linux.intel.com Cc: Xin Xiaohui Subject: [PATCH v14 11/17] Add a hook to intercept external buffers from NIC driver. Date: Thu, 4 Nov 2010 17:05:07 +0800 Message-Id: <1d5846a8be592339af246d19d99c0243855978d0.1288860477.git.xiaohui.xin@intel.com> X-Mailer: git-send-email 1.7.3 In-Reply-To: <1288861513-5707-1-git-send-email-xiaohui.xin@intel.com> References: <1288861513-5707-1-git-send-email-xiaohui.xin@intel.com> In-Reply-To: References: 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 (demeter1.kernel.org [140.211.167.41]); Thu, 04 Nov 2010 08:48:08 +0000 (UTC) diff --git a/net/core/dev.c b/net/core/dev.c index 84fbb83..bdad1c8 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -2814,6 +2814,40 @@ int __skb_bond_should_drop(struct sk_buff *skb, struct net_device *master) } EXPORT_SYMBOL(__skb_bond_should_drop); +#if defined(CONFIG_MEDIATE_PASSTHRU) || defined(CONFIG_MEDIATE_PASSTHRU_MODULE) +/* Add a hook to intercept mediate passthru(zero-copy) packets, + * and insert it to the socket queue owned by mp_port specially. + */ +static inline struct sk_buff *handle_mpassthru(struct sk_buff *skb, + struct packet_type **pt_prev, + int *ret, + struct net_device *orig_dev) +{ + struct mp_port *mp_port = NULL; + struct sock *sk = NULL; + + if (!dev_is_mpassthru(skb->dev) && !dev_is_mpassthru(orig_dev)) + return skb; + if (dev_is_mpassthru(skb->dev)) + mp_port = skb->dev->mp_port; + else if (orig_dev->master == skb->dev && dev_is_mpassthru(orig_dev)) + mp_port = orig_dev->mp_port; + + if (*pt_prev) { + *ret = deliver_skb(skb, *pt_prev, orig_dev); + *pt_prev = NULL; + } + + sk = mp_port->sock->sk; + skb_queue_tail(&sk->sk_receive_queue, skb); + sk->sk_state_change(sk); + + return NULL; +} +#else +#define handle_mpassthru(skb, pt_prev, ret, orig_dev) (skb) +#endif + static int __netif_receive_skb(struct sk_buff *skb) { struct packet_type *ptype, *pt_prev; @@ -2891,6 +2925,11 @@ static int __netif_receive_skb(struct sk_buff *skb) ncls: #endif + /* To intercept mediate passthru(zero-copy) packets here */ + skb = handle_mpassthru(skb, &pt_prev, &ret, orig_dev); + if (!skb) + goto out; + /* Handle special case of bridge or macvlan */ rx_handler = rcu_dereference(skb->dev->rx_handler); if (rx_handler) { @@ -2983,6 +3022,7 @@ err: EXPORT_SYMBOL(netdev_mp_port_prep); #endif + /** * netif_receive_skb - process receive buffer from network * @skb: buffer to process