[Intel-wired-lan] [next PATCH v2 3/5] fm10k: Cleanup exception handling for changing queues

[Jeff Kirsher]

From: Alexander Duyck <aduyck at mirantis.com>

This patch is meant to cleanup the exception handling for the paths where
we reset the interrupts and then reconfigure them.  In all of these paths
we had very different levels of exception handling.  I have updated the
driver so that all of the paths should result in a similar state if we
fail.

Specifically the driver will now unload the mailbox interrupt, free the
queue vectors and MSI-X, and then detach the interface.

In addition for any of the PCIe related resets I have added a check with
the hw_ready function to just make sure the registers are in a readable
state prior to reopening the interface.

Signed-off-by: Alexander Duyck <aduyck at mirantis.com>
---
v2: cleaned up trailing whitespace

 drivers/net/ethernet/intel/fm10k/fm10k_netdev.c | 17 ++++++--
 drivers/net/ethernet/intel/fm10k/fm10k_pci.c    | 53 +++++++++++++++++++------
 2 files changed, 54 insertions(+), 16 deletions(-)

diff --git a/drivers/net/ethernet/intel/fm10k/fm10k_netdev.c b/drivers/net/ethernet/intel/fm10k/fm10k_netdev.c
index 4307f18..1be8083 100644
--- a/drivers/net/ethernet/intel/fm10k/fm10k_netdev.c
+++ b/drivers/net/ethernet/intel/fm10k/fm10k_netdev.c
@@ -1176,19 +1176,28 @@ int fm10k_setup_tc(struct net_device *dev, u8 tc)
 
 	err = fm10k_init_queueing_scheme(interface);
 	if (err)
-		return err;
+		goto err_queueing_scheme;
 
 	err = fm10k_mbx_request_irq(interface);
 	if (err)
-		return err;
+		goto err_mbx_irq;
 
-	if (netif_running(dev))
-		fm10k_open(dev);
+	err = netif_running(dev) ? fm10k_open(dev) : 0;
+	if (err)
+		goto err_open;
 
 	/* flag to indicate SWPRI has yet to be updated */
 	interface->flags |= FM10K_FLAG_SWPRI_CONFIG;
 
 	return 0;
+err_open:
+	fm10k_mbx_free_irq(interface);
+err_mbx_irq:
+	fm10k_clear_queueing_scheme(interface);
+err_queueing_scheme:
+	netif_device_detach(dev);
+
+	return err;
 }
 
 static int fm10k_ioctl(struct net_device *netdev, struct ifreq *ifr, int cmd)
diff --git a/drivers/net/ethernet/intel/fm10k/fm10k_pci.c b/drivers/net/ethernet/intel/fm10k/fm10k_pci.c
index 464a64d..72f782c 100644
--- a/drivers/net/ethernet/intel/fm10k/fm10k_pci.c
+++ b/drivers/net/ethernet/intel/fm10k/fm10k_pci.c
@@ -185,7 +185,13 @@ static void fm10k_reinit(struct fm10k_intfc *interface)
 	}
 
 	/* reassociate interrupts */
-	fm10k_mbx_request_irq(interface);
+	err = fm10k_mbx_request_irq(interface);
+	if (err)
+		goto err_mbx_irq;
+
+	err = fm10k_hw_ready(interface);
+	if (err)
+		goto err_open;
 
 	/* update hardware address for VFs if perm_addr has changed */
 	if (hw->mac.type == fm10k_mac_vf) {
@@ -205,14 +211,23 @@ static void fm10k_reinit(struct fm10k_intfc *interface)
 	/* reset clock */
 	fm10k_ts_reset(interface);
 
-	if (netif_running(netdev))
-		fm10k_open(netdev);
+	err = netif_running(netdev) ? fm10k_open(netdev) : 0;
+	if (err)
+		goto err_open;
 
 	fm10k_iov_resume(interface->pdev);
 
+	rtnl_unlock();
+
+	clear_bit(__FM10K_RESETTING, &interface->state);
+
+	return;
+err_open:
+	fm10k_mbx_free_irq(interface);
+err_mbx_irq:
+	fm10k_clear_queueing_scheme(interface);
 reinit_err:
-	if (err)
-		netif_device_detach(netdev);
+	netif_device_detach(netdev);
 
 	rtnl_unlock();
 
@@ -2116,16 +2131,22 @@ static int fm10k_resume(struct pci_dev *pdev)
 	rtnl_lock();
 
 	err = fm10k_init_queueing_scheme(interface);
-	if (!err) {
-		fm10k_mbx_request_irq(interface);
-		if (netif_running(netdev))
-			err = fm10k_open(netdev);
-	}
+	if (err)
+		goto err_queueing_scheme;
 
-	rtnl_unlock();
+	err = fm10k_mbx_request_irq(interface);
+	if (err)
+		goto err_mbx_irq;
 
+	err = fm10k_hw_ready(interface);
 	if (err)
-		return err;
+		goto err_open;
+
+	err = netif_running(netdev) ? fm10k_open(netdev) : 0;
+	if (err)
+		goto err_open;
+
+	rtnl_unlock();
 
 	/* assume host is not ready, to prevent race with watchdog in case we
 	 * actually don't have connection to the switch
@@ -2143,6 +2164,14 @@ static int fm10k_resume(struct pci_dev *pdev)
 	netif_device_attach(netdev);
 
 	return 0;
+err_open:
+	fm10k_mbx_free_irq(interface);
+err_mbx_irq:
+	fm10k_clear_queueing_scheme(interface);
+err_queueing_scheme:
+	rtnl_unlock();
+
+	return err;
 }
 
 /**
-- 
2.5.0