From mboxrd@z Thu Jan 1 00:00:00 1970 From: xiaohui.xin@intel.com Subject: [PATCH v11 10/17] Add a hook to intercept external buffers from NIC driver. Date: Sat, 25 Sep 2010 12:27:28 +0800 Message-ID: <22aaeb00a5bd57d8b76ad714f495823c1db06927.1285385607.git.xiaohui.xin@intel.com> References: <1285388855-27410-1-git-send-email-xiaohui.xin@intel.com> Cc: Xin Xiaohui To: netdev@vger.kernel.org, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, mingo@elte.hu, davem@davemloft.net, herbert@gondor.hengli.com.au, jdike@linux.intel.com Return-path: Received: from mga02.intel.com ([134.134.136.20]:47863 "EHLO mga02.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750793Ab0IYEKq (ORCPT ); Sat, 25 Sep 2010 00:10:46 -0400 In-Reply-To: <1285388855-27410-1-git-send-email-xiaohui.xin@intel.com> In-Reply-To: <59d8a50047ee01e26658fd676d26c0162b79e5fd.1285385607.git.xiaohui.xin@intel.com> References: <59d8a50047ee01e26658fd676d26c0162b79e5fd.1285385607.git.xiaohui.xin@intel.com> Sender: netdev-owner@vger.kernel.org List-ID: 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; -- 1.7.3