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cxgb4vf: Quiesce Virtual Interfaces on shutdown ... 

When a Virtual Machine is rebooted, KVM currently fails to issue a Function
Level Reset against any "Attached PCI Devices" (AKA "PCI Passthrough").  In
addition to leaving the attached device in a random state in the next booted
kernel (which sort of violates the entire idea of a reboot reseting hardware
state), this leaves our peer thinking that the link is still up.  (Note that
a bug has been filed with the KVM folks, #25332, but there's been no
response on that as of yet.)  So, we add a "->shutdown()" method for the
Virtual Function PCI Device to handle administrative shutdowns like a
reboot.

Signed-off-by: Casey Leedom <leedom@chelsio.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Casey Leedom 2011-02-14 12:56:24 +00:00 committed by David S. Miller
parent 843635e034
commit 7e9c26295b
1 changed files with 41 additions and 0 deletions
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41
drivers/net/cxgb4vf/cxgb4vf_main.c
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@ -2861,6 +2861,46 @@ static void __devexit cxgb4vf_pci_remove(struct pci_dev *pdev)
pci_release_regions(pdev);
}
/*
* "Shutdown" quiesce the device, stopping Ingress Packet and Interrupt
* delivery.
*/
static void __devexit cxgb4vf_pci_shutdown(struct pci_dev *pdev)
{
struct adapter *adapter;
int pidx;
adapter = pci_get_drvdata(pdev);
if (!adapter)
return;
/*
* Disable all Virtual Interfaces. This will shut down the
* delivery of all ingress packets into the chip for these
* Virtual Interfaces.
*/
for_each_port(adapter, pidx) {
struct net_device *netdev;
struct port_info *pi;
if (!test_bit(pidx, &adapter->registered_device_map))
continue;
netdev = adapter->port[pidx];
if (!netdev)
continue;
pi = netdev_priv(netdev);
t4vf_enable_vi(adapter, pi->viid, false, false);
}
/*
* Free up all Queues which will prevent further DMA and
* Interrupts allowing various internal pathways to drain.
*/
t4vf_free_sge_resources(adapter);
}
/*
* PCI Device registration data structures.
*/
@ -2894,6 +2934,7 @@ static struct pci_driver cxgb4vf_driver = {
.id_table = cxgb4vf_pci_tbl,
.probe = cxgb4vf_pci_probe,
.remove = __devexit_p(cxgb4vf_pci_remove),
.shutdown = __devexit_p(cxgb4vf_pci_shutdown),
};
/*