From patchwork Tue Nov 9 09:03:16 2010 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Xin, Xiaohui" X-Patchwork-Id: 70510 X-Patchwork-Delegate: davem@davemloft.net Return-Path: X-Original-To: patchwork-incoming@ozlabs.org Delivered-To: patchwork-incoming@ozlabs.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 32A76B7125 for ; Tue, 9 Nov 2010 19:44:31 +1100 (EST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754431Ab0KIInt (ORCPT ); Tue, 9 Nov 2010 03:43:49 -0500 Received: from mga11.intel.com ([192.55.52.93]:40024 "EHLO mga11.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754210Ab0KIIlp (ORCPT ); Tue, 9 Nov 2010 03:41:45 -0500 Received: from fmsmga002.fm.intel.com ([10.253.24.26]) by fmsmga102.fm.intel.com with ESMTP; 09 Nov 2010 00:41:44 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.59,174,1288594800"; d="scan'208";a="624917763" Received: from unknown (HELO localhost.localdomain.sh.intel.com) ([10.239.36.134]) by fmsmga002.fm.intel.com with ESMTP; 09 Nov 2010 00:41:43 -0800 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.apana.org.au, jdike@linux.intel.com Cc: Xin Xiaohui Subject: [PATCH v15 11/17] Add a hook to intercept external buffers from NIC driver. Date: Tue, 9 Nov 2010 17:03:16 +0800 Message-Id: <5288ec35e729b69e9bfdc627abcecfef1ab2ec15.1289280886.git.xiaohui.xin@intel.com> X-Mailer: git-send-email 1.7.3 In-Reply-To: <1289293402-4791-1-git-send-email-xiaohui.xin@intel.com> References: <1289293402-4791-1-git-send-email-xiaohui.xin@intel.com> In-Reply-To: References: Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org From: Xin Xiaohui The hook is called in __netif_receive_skb(). Signed-off-by: Xin Xiaohui Signed-off-by: Zhao Yu Reviewed-by: Jeff Dike --- net/core/dev.c | 40 ++++++++++++++++++++++++++++++++++++++++ 1 files changed, 40 insertions(+), 0 deletions(-) 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