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i40evf: allow channel bonding of VFs

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In some modes, bonding would not enslave VF interfaces. This is due to
bonding calling change_mtu and the immediately calling open. Because of
the asynchronous nature of the admin queue mechanism, the VF returns
-EBUSY to the open call, because it knows the previous operation hasn't
finished yet. This causes bonding to fail with a less-than-useful error
message.

To fix this, remove the check for pending operations at the beginning of
open. But this introduces a new bug where the driver will panic on a
quick close/open cycle. To fix that, we add a new driver state,
__I40EVF_DOWN_PENDING, that the driver enters when down is called. The
driver finally transitions to a fully DOWN state when it receives
confirmation from the PF driver that all the queues are disabled. This
allows open to complete even if there is a pending mtu change, and
bonding is finally happy.

Change-ID: I06f4c7e435d5bacbfceaa7c3f209e0ff04be21cc
Signed-off-by: Mitch Williams <mitch.a.williams@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
This commit is contained in:
Mitch Williams 2015-12-09 15:50:27 -08:00 committed by Jeff Kirsher
parent 48b1804ee3
commit 209dc4daf2
3 changed files with 8 additions and 4 deletions
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1
drivers/net/ethernet/intel/i40evf/i40evf.h
View File

@ -173,6 +173,7 @@ enum i40evf_state_t {
__I40EVF_RESETTING, /* in reset */
/* Below here, watchdog is running */
__I40EVF_DOWN, /* ready, can be opened */
__I40EVF_DOWN_PENDING, /* descending, waiting for watchdog */
__I40EVF_TESTING, /* in ethtool self-test */
__I40EVF_RUNNING, /* opened, working */
};

9
drivers/net/ethernet/intel/i40evf/i40evf_main.c
View File

@ -1032,7 +1032,7 @@ void i40evf_down(struct i40evf_adapter *adapter)
struct net_device *netdev = adapter->netdev;
struct i40evf_mac_filter *f;
if (adapter->state == __I40EVF_DOWN)
if (adapter->state <= __I40EVF_DOWN_PENDING)
return;
while (test_and_set_bit(__I40EVF_IN_CRITICAL_TASK,
@ -2142,7 +2142,8 @@ static int i40evf_open(struct net_device *netdev)
dev_err(&adapter->pdev->dev, "Unable to open device due to PF driver failure.\n");
return -EIO;
}
if (adapter->state != __I40EVF_DOWN || adapter->aq_required)
if (adapter->state != __I40EVF_DOWN)
return -EBUSY;
/* allocate transmit descriptors */
@ -2197,14 +2198,14 @@ static int i40evf_close(struct net_device *netdev)
{
struct i40evf_adapter *adapter = netdev_priv(netdev);
if (adapter->state <= __I40EVF_DOWN)
if (adapter->state <= __I40EVF_DOWN_PENDING)
return 0;
set_bit(__I40E_DOWN, &adapter->vsi.state);
i40evf_down(adapter);
adapter->state = __I40EVF_DOWN;
adapter->state = __I40EVF_DOWN_PENDING;
i40evf_free_traffic_irqs(adapter);
return 0;

2
drivers/net/ethernet/intel/i40evf/i40evf_virtchnl.c
View File

@ -804,6 +804,8 @@ void i40evf_virtchnl_completion(struct i40evf_adapter *adapter,
case I40E_VIRTCHNL_OP_DISABLE_QUEUES:
i40evf_free_all_tx_resources(adapter);
i40evf_free_all_rx_resources(adapter);
if (adapter->state == __I40EVF_DOWN_PENDING)
adapter->state = __I40EVF_DOWN;
break;
case I40E_VIRTCHNL_OP_VERSION:
case I40E_VIRTCHNL_OP_CONFIG_IRQ_MAP: