From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jeff Kirsher Subject: [net-next-2.6 PATCH 3/3] ixgbe: add a refcnt when turning on/off FCoE offload capability Date: Thu, 21 Oct 2010 02:00:30 -0700 Message-ID: <20101021090027.12059.44871.stgit@localhost.localdomain> References: <20101021085740.12059.20577.stgit@localhost.localdomain> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Cc: netdev@vger.kernel.org, gospo@redhat.com, bphilips@novell.com, Yi Zou , Jeff Kirsher To: davem@davemloft.net Return-path: Received: from qmta08.westchester.pa.mail.comcast.net ([76.96.62.80]:34081 "EHLO qmta08.westchester.pa.mail.comcast.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755354Ab0JUJAv (ORCPT ); Thu, 21 Oct 2010 05:00:51 -0400 In-Reply-To: <20101021085740.12059.20577.stgit@localhost.localdomain> Sender: netdev-owner@vger.kernel.org List-ID: From: Yi Zou The FCoE offload is enabled/disabled per adapter, but upper FCoE protocol stack could have multiple FCoE instances created on the same physical network interface, e.g., FCoE on multiple VLAN interfaces on the same physical network interface. In this case we want to turn on FCoE offload at the first request from ndo_fcoe_enable() but only turn off FCoE offload at the very last call to ndo_fcoe_disable(). This is fixed by adding a refcnt in the per adapter FCoE structure and tear down FCoE offload when refcnt decrements to zero. Signed-off-by: Yi Zou Tested-by: Ross Brattain Signed-off-by: Jeff Kirsher --- drivers/net/ixgbe/ixgbe_fcoe.c | 6 ++++++ drivers/net/ixgbe/ixgbe_fcoe.h | 1 + 2 files changed, 7 insertions(+), 0 deletions(-) diff --git a/drivers/net/ixgbe/ixgbe_fcoe.c b/drivers/net/ixgbe/ixgbe_fcoe.c index 2f1de8b..05efa6a 100644 --- a/drivers/net/ixgbe/ixgbe_fcoe.c +++ b/drivers/net/ixgbe/ixgbe_fcoe.c @@ -604,11 +604,13 @@ int ixgbe_fcoe_enable(struct net_device *netdev) { int rc = -EINVAL; struct ixgbe_adapter *adapter = netdev_priv(netdev); + struct ixgbe_fcoe *fcoe = &adapter->fcoe; if (!(adapter->flags & IXGBE_FLAG_FCOE_CAPABLE)) goto out_enable; + atomic_inc(&fcoe->refcnt); if (adapter->flags & IXGBE_FLAG_FCOE_ENABLED) goto out_enable; @@ -648,6 +650,7 @@ int ixgbe_fcoe_disable(struct net_device *netdev) { int rc = -EINVAL; struct ixgbe_adapter *adapter = netdev_priv(netdev); + struct ixgbe_fcoe *fcoe = &adapter->fcoe; if (!(adapter->flags & IXGBE_FLAG_FCOE_CAPABLE)) goto out_disable; @@ -655,6 +658,9 @@ int ixgbe_fcoe_disable(struct net_device *netdev) if (!(adapter->flags & IXGBE_FLAG_FCOE_ENABLED)) goto out_disable; + if (!atomic_dec_and_test(&fcoe->refcnt)) + goto out_disable; + e_info(drv, "Disabling FCoE offload features.\n"); netdev->features &= ~NETIF_F_FCOE_CRC; netdev->features &= ~NETIF_F_FSO; diff --git a/drivers/net/ixgbe/ixgbe_fcoe.h b/drivers/net/ixgbe/ixgbe_fcoe.h index abf4b2b..4bc2c55 100644 --- a/drivers/net/ixgbe/ixgbe_fcoe.h +++ b/drivers/net/ixgbe/ixgbe_fcoe.h @@ -66,6 +66,7 @@ struct ixgbe_fcoe { u8 tc; u8 up; #endif + atomic_t refcnt; spinlock_t lock; struct pci_pool *pool; struct ixgbe_fcoe_ddp ddp[IXGBE_FCOE_DDP_MAX];