From mboxrd@z Thu Jan 1 00:00:00 1970 From: xiaohui.xin@intel.com Subject: [RFC][PATCH v6 03/19] Export 2 func for device to assign/deassign new strucure Date: Fri, 21 May 2010 17:30:19 +0800 Message-ID: <1274434235-5929-4-git-send-email-xiaohui.xin@intel.com> References: <1274434235-5929-1-git-send-email-xiaohui.xin@intel.com> <1274434235-5929-2-git-send-email-xiaohui.xin@intel.com> <1274434235-5929-3-git-send-email-xiaohui.xin@intel.com> Cc: Xin Xiaohui To: netdev@vger.kernel.org, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, mst@redhat.com, mingo@elte.hu, davem@davemloft.net, jdike@linux.intel.com Return-path: In-Reply-To: <1274434235-5929-3-git-send-email-xiaohui.xin@intel.com> Sender: kvm-owner@vger.kernel.org List-Id: netdev.vger.kernel.org From: Xin Xiaohui Signed-off-by: Xin Xiaohui Signed-off-by: Zhao Yu Reviewed-by: Jeff Dike --- include/linux/netdevice.h | 3 +++ net/core/dev.c | 28 ++++++++++++++++++++++++++++ 2 files changed, 31 insertions(+), 0 deletions(-) diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h index bae725c..efb575a 100644 --- a/include/linux/netdevice.h +++ b/include/linux/netdevice.h @@ -1592,6 +1592,9 @@ extern gro_result_t napi_frags_finish(struct napi_struct *napi, gro_result_t ret); extern struct sk_buff * napi_frags_skb(struct napi_struct *napi); extern gro_result_t napi_gro_frags(struct napi_struct *napi); +extern int netdev_mp_port_attach(struct net_device *dev, + struct mpassthru_port *port); +extern void netdev_mp_port_detach(struct net_device *dev); static inline void napi_free_frags(struct napi_struct *napi) { diff --git a/net/core/dev.c b/net/core/dev.c index f769098..ecbb6b1 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -2469,6 +2469,34 @@ void netif_nit_deliver(struct sk_buff *skb) rcu_read_unlock(); } +/* Export two functions to assign/de-assign mp_port pointer + * to a net device. + */ + +int netdev_mp_port_attach(struct net_device *dev, + struct mpassthru_port *port) +{ + /* locked by mp_mutex */ + if (rcu_dereference(dev->mp_port)) + return -EBUSY; + + rcu_assign_pointer(dev->mp_port, port); + + return 0; +} +EXPORT_SYMBOL(netdev_mp_port_attach); + +void netdev_mp_port_detach(struct net_device *dev) +{ + /* locked by mp_mutex */ + if (!rcu_dereference(dev->mp_port)) + return; + + rcu_assign_pointer(dev->mp_port, NULL); + synchronize_rcu(); +} +EXPORT_SYMBOL(netdev_mp_port_detach); + /** * netif_receive_skb - process receive buffer from network * @skb: buffer to process -- 1.5.4.4