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i40evf: invite vector 0 to the interrupt party 

The i40evf_irq_enable and i40evf_fire_sw_interrupt functions were
unfairly discriminating against MSI-X vector 0, just because it doesn't
handle traffic. That doesn't mean it's not essential to the operation of
the driver. This change allows the watchdog to fire vector 0 via
software, which makes the driver tolerant of dropped interrupts on that
vector.

Buck up, vector 0! You can be part of our gang!

Change-ID: I37131d955018a6b3e711e1732d21428acd0d767e
Signed-off-by: Mitch Williams <mitch.a.williams@intel.com>
Tested-by: Jim Young <jamesx.m.young@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
This commit is contained in:
Mitch Williams 2014-06-04 08:45:19 +00:00 committed by Jeff Kirsher
parent 56497978bc
commit 164ec1bfa1
1 changed files with 7 additions and 0 deletions
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7
drivers/net/ethernet/intel/i40evf/i40evf_main.c
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@ -260,6 +260,12 @@ static void i40evf_fire_sw_int(struct i40evf_adapter *adapter,
int i;
uint32_t dyn_ctl;
if (mask & 1) {
dyn_ctl = rd32(hw, I40E_VFINT_DYN_CTL01);
dyn_ctl |= I40E_VFINT_DYN_CTLN_SWINT_TRIG_MASK |
I40E_VFINT_DYN_CTLN_CLEARPBA_MASK;
wr32(hw, I40E_VFINT_DYN_CTL01, dyn_ctl);
}
for (i = 1; i < adapter->num_msix_vectors; i++) {
if (mask & (1 << i)) {
dyn_ctl = rd32(hw, I40E_VFINT_DYN_CTLN1(i - 1));
@ -278,6 +284,7 @@ void i40evf_irq_enable(struct i40evf_adapter *adapter, bool flush)
{
struct i40e_hw *hw = &adapter->hw;
i40evf_misc_irq_enable(adapter);
i40evf_irq_enable_queues(adapter, ~0);
if (flush)