Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757236Ab0G2LEm (ORCPT ); Thu, 29 Jul 2010 07:04:42 -0400 Received: from mga11.intel.com ([192.55.52.93]:58755 "EHLO mga11.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756937Ab0G2LBc (ORCPT ); Thu, 29 Jul 2010 07:01:32 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.55,279,1278313200"; d="scan'208";a="590877574" 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 v8 10/16] Add a hook to intercept external buffers from NIC driver. Date: Thu, 29 Jul 2010 19:14:42 +0800 Message-Id: <1280402088-5849-11-git-send-email-xiaohui.xin@intel.com> X-Mailer: git-send-email 1.5.4.4 In-Reply-To: <1280402088-5849-10-git-send-email-xiaohui.xin@intel.com> References: <1280402088-5849-1-git-send-email-xiaohui.xin@intel.com> <1280402088-5849-2-git-send-email-xiaohui.xin@intel.com> <1280402088-5849-3-git-send-email-xiaohui.xin@intel.com> <1280402088-5849-4-git-send-email-xiaohui.xin@intel.com> <1280402088-5849-5-git-send-email-xiaohui.xin@intel.com> <1280402088-5849-6-git-send-email-xiaohui.xin@intel.com> <1280402088-5849-7-git-send-email-xiaohui.xin@intel.com> <1280402088-5849-8-git-send-email-xiaohui.xin@intel.com> <1280402088-5849-9-git-send-email-xiaohui.xin@intel.com> <1280402088-5849-10-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: 2036 Lines: 71 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 | 35 +++++++++++++++++++++++++++++++++++ 1 files changed, 35 insertions(+), 0 deletions(-) diff --git a/net/core/dev.c b/net/core/dev.c index 636f11b..4b379b1 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 mpassthru_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; -- 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/