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Commit 7e9c2629 authored by Casey Leedom's avatar Casey Leedom Committed by David S. Miller
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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: default avatarCasey Leedom <leedom@chelsio.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 843635e0

drivers/net/cxgb4vf/cxgb4vf_main.c

+41 −0
Original line number Diff line number Diff line
@@ -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),

};



/*