From patchwork Thu Sep 30 14:04:27 2010 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Xin, Xiaohui" X-Patchwork-Id: 220102 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 o8UDpwuZ024517 for ; Thu, 30 Sep 2010 13:52:02 GMT Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756338Ab0I3NsR (ORCPT ); Thu, 30 Sep 2010 09:48:17 -0400 Received: from mga03.intel.com ([143.182.124.21]:30013 "EHLO mga03.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756282Ab0I3NrI (ORCPT ); Thu, 30 Sep 2010 09:47:08 -0400 Received: from azsmga001.ch.intel.com ([10.2.17.19]) by azsmga101.ch.intel.com with ESMTP; 30 Sep 2010 06:47:08 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.57,259,1283756400"; d="scan'208";a="330506238" Received: from unknown (HELO localhost.localdomain.sh.intel.com) ([10.239.36.37]) by azsmga001.ch.intel.com with ESMTP; 30 Sep 2010 06:47:06 -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 v12 10/17] Add a hook to intercept external buffers from NIC driver. Date: Thu, 30 Sep 2010 22:04:27 +0800 Message-Id: X-Mailer: git-send-email 1.7.3 In-Reply-To: <1285855474-12110-1-git-send-email-xiaohui.xin@intel.com> References: <1285855474-12110-1-git-send-email-xiaohui.xin@intel.com> In-Reply-To: <59d8a50047ee01e26658fd676d26c0162b79e5fd.1285853725.git.xiaohui.xin@intel.com> References: <59d8a50047ee01e26658fd676d26c0162b79e5fd.1285853725.git.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 (demeter1.kernel.org [140.211.167.41]); Thu, 30 Sep 2010 13:52:03 +0000 (UTC) diff --git a/net/core/dev.c b/net/core/dev.c index c11e32c..83172b8 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -2517,6 +2517,37 @@ err: EXPORT_SYMBOL(netdev_mp_port_prep); #endif +#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)) + return skb; + mp_port = skb->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 + /** * netif_receive_skb - process receive buffer from network * @skb: buffer to process @@ -2598,6 +2629,10 @@ 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; skb = handle_bridge(skb, &pt_prev, &ret, orig_dev); if (!skb) goto out;