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igb: fix driver reload with VF assigned to guest 

commit fa44f2f185 broke reloading of igb, when
VFs are assigned to a guest, in several ways.
1. on module load adapter->vf_data does not get properly allocated,
resulting in a null pointer exception when accessing adapter->vf_data in
igb_reset() on module reload.
 modprobe -r igb ; modprobe igb max_vfs=7
[  215.215837] igb 0000:01:00.1: removed PHC on eth1
[  216.932072] igb 0000:01:00.1: IOV Disabled
[  216.937038] igb 0000:01:00.0: removed PHC on eth0
[  217.127032] igb 0000:01:00.0: Cannot deallocate SR-IOV virtual functions while they are assigned - VFs will not be deallocated
[  217.146178] igb: Intel(R) Gigabit Ethernet Network Driver - version 5.0.5-k
[  217.154050] igb: Copyright (c) 2007-2013 Intel Corporation.
[  217.160688] igb 0000:01:00.0: Enabling SR-IOV VFs using the module parameter is deprecated - please use the pci sysfs interface.
[  217.173703] igb 0000:01:00.0: irq 103 for MSI/MSI-X
[  217.179227] igb 0000:01:00.0: irq 104 for MSI/MSI-X
[  217.184735] igb 0000:01:00.0: irq 105 for MSI/MSI-X
[  217.220082] BUG: unable to handle kernel NULL pointer dereference at 0000000000000048
[  217.228846] IP: [<ffffffffa007c5e5>] igb_reset+0xc5/0x4b0 [igb]
[  217.235472] PGD 3607ec067 PUD 36170b067 PMD 0
[  217.240461] Oops: 0002 [#1] SMP
[  217.244085] Modules linked in: igb(+) igbvf mptsas mptscsih mptbase scsi_transport_sas [last unloaded: igb]
[  217.255040] CPU: 4 PID: 4833 Comm: modprobe Not tainted 3.11.0+ #46
[...]
[  217.390007]  [<ffffffffa007fab2>] igb_probe+0x892/0xfd0 [igb]
[  217.396422]  [<ffffffff81470b3e>] local_pci_probe+0x1e/0x40
[  217.402641]  [<ffffffff81472029>] pci_device_probe+0xf9/0x110
[...]
2. A follow up issue, pci_enable_sriov() should only be called if no VFs were
still allocated on module unload. Otherwise pci_enable_sriov() gets called
multiple times in a row rendering the NIC unusable until reset.
3. simply calling igb_enable_sriov() in igb_probe_vfs() is not enough as the
interrupts need to be re-setup. Switching that to igb_pci_enable_sriov().

Signed-off-by: Stefan Assmann <sassmann@kpanic.de>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Tested-by: Sibai Li <Sibai.li@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
This commit is contained in:
Stefan Assmann 2013-09-24 05:18:39 +00:00 committed by Jeff Kirsher
parent d1c17d806b
commit 781798a11e
1 changed files with 16 additions and 21 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

37
drivers/net/ethernet/intel/igb/igb_main.c
View File

@ -182,6 +182,7 @@ static void igb_check_vf_rate_limit(struct igb_adapter *);
#ifdef CONFIG_PCI_IOV
static int igb_vf_configure(struct igb_adapter *adapter, int vf);
static int igb_pci_enable_sriov(struct pci_dev *dev, int num_vfs);
#endif
#ifdef CONFIG_PM
@ -2429,7 +2430,7 @@ static int igb_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
}
#ifdef CONFIG_PCI_IOV
static int igb_disable_sriov(struct pci_dev *pdev)
static int igb_disable_sriov(struct pci_dev *pdev)
{
struct net_device *netdev = pci_get_drvdata(pdev);
struct igb_adapter *adapter = netdev_priv(netdev);
@ -2470,27 +2471,19 @@ static int igb_enable_sriov(struct pci_dev *pdev, int num_vfs)
int err = 0;
int i;
if (!adapter->msix_entries) {
if (!adapter->msix_entries || num_vfs > 7) {
err = -EPERM;
goto out;
}
if (!num_vfs)
goto out;
else if (old_vfs && old_vfs == num_vfs)
goto out;
else if (old_vfs && old_vfs != num_vfs)
err = igb_disable_sriov(pdev);
if (err)
goto out;
if (num_vfs > 7) {
err = -EPERM;
goto out;
}
adapter->vfs_allocated_count = num_vfs;
if (old_vfs) {
dev_info(&pdev->dev, "%d pre-allocated VFs found - override max_vfs setting of %d\n",
old_vfs, max_vfs);
adapter->vfs_allocated_count = old_vfs;
} else
adapter->vfs_allocated_count = num_vfs;
adapter->vf_data = kcalloc(adapter->vfs_allocated_count,
sizeof(struct vf_data_storage), GFP_KERNEL);
@ -2504,10 +2497,12 @@ static int igb_enable_sriov(struct pci_dev *pdev, int num_vfs)
goto out;
}
err = pci_enable_sriov(pdev, adapter->vfs_allocated_count);
if (err)
goto err_out;
/* only call pci_enable_sriov() if no VFs are allocated already */
if (!old_vfs) {
err = pci_enable_sriov(pdev, adapter->vfs_allocated_count);
if (err)
goto err_out;
}
dev_info(&pdev->dev, "%d VFs allocated\n",
adapter->vfs_allocated_count);
for (i = 0; i < adapter->vfs_allocated_count; i++)
@ -2623,7 +2618,7 @@ static void igb_probe_vfs(struct igb_adapter *adapter)
return;
pci_sriov_set_totalvfs(pdev, 7);
igb_enable_sriov(pdev, max_vfs);
igb_pci_enable_sriov(pdev, max_vfs);
#endif /* CONFIG_PCI_IOV */
}