fm10k: Cleanup exception handling for changing queues

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@mirantis.com>
Reviewed-by: Bruce Allan <bruce.w.allan@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Orabug: 25394529
(cherry picked from commit 09f8a82b6abbff279f41ac2892707d3f0f32d00c)
Signed-off-by: Jack Vogel <jack.vogel@oracle.com>

diff --git a/drivers/net/ethernet/intel/fm10k/fm10k_netdev.c b/drivers/net/ethernet/intel/fm10k/fm10k_netdev.c
index d9854d39576d46281a8fa60f2584d7cad46f890e..99e49d35512e8abb909e24fdf86ba9e3be9ff7cf 100644 (file)
--- a/drivers/net/ethernet/intel/fm10k/fm10k_netdev.c
+++ b/drivers/net/ethernet/intel/fm10k/fm10k_netdev.c
@@ -1153,6 +1153,7 @@ static struct rtnl_link_stats64 *fm10k_get_stats64(struct net_device *netdev,
 int fm10k_setup_tc(struct net_device *dev, u8 tc)
 {
        struct fm10k_intfc *interface = netdev_priv(dev);
+       int err;
 
        /* Currently only the PF supports priority classes */
        if (tc && (interface->hw.mac.type != fm10k_mac_pf))
@@ -1177,17 +1178,30 @@ int fm10k_setup_tc(struct net_device *dev, u8 tc)
        netdev_reset_tc(dev);
        netdev_set_num_tc(dev, tc);
 
-       fm10k_init_queueing_scheme(interface);
+       err = fm10k_init_queueing_scheme(interface);
+       if (err)
+               goto err_queueing_scheme;
 
-       fm10k_mbx_request_irq(interface);
+       err = fm10k_mbx_request_irq(interface);
+       if (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 020f6dce41544cd69f21f5bbd2d14df67b01bf6b..202468f07edece5c7dfd38896e1c0276548d8f92 100644 (file)
--- a/drivers/net/ethernet/intel/fm10k/fm10k_pci.c
+++ b/drivers/net/ethernet/intel/fm10k/fm10k_pci.c
@@ -186,7 +186,13 @@ 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) {
@@ -206,14 +212,23 @@ 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();
 
@@ -2131,16 +2146,22 @@ 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
@@ -2158,6 +2179,14 @@ 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;
 }
 
 /**