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iavf: restore MSI state on reset

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commit 7e4dcc1396 upstream.

If the PF experiences an FLR, the VF's MSI and MSI-X configuration will
be conveniently and silently removed in the process. When this happens,
reset recovery will appear to complete normally but no traffic will
pass. The netdev watchdog will helpfully notify everyone of this issue.

To prevent such public embarrassment, restore MSI configuration at every
reset. For normal resets, this will do no harm, but for VF resets
resulting from a PF FLR, this will keep the VF working.

Fixes: 5eae00c57f ("i40evf: main driver core")
Signed-off-by: Mitch Williams <mitch.a.williams@intel.com>
Tested-by: George Kuruvinakunnel <george.kuruvinakunnel@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Mitch Williams 2021-06-04 09:53:28 -07:00 • committed by Greg Kroah-Hartman
commit aada0b3f33
1 changed files with 1 additions and 0 deletions
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drivers/net/ethernet/intel/iavf/iavf_main.c
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@ -2139,6 +2139,7 @@ static void iavf_reset_task(struct work_struct *work)
}
pci_set_master(adapter->pdev);
pci_restore_msi_state(adapter->pdev);
if (i == IAVF_RESET_WAIT_COMPLETE_COUNT) {
dev_err(&adapter->pdev->dev, "Reset never finished (%x)\n",