liquidio: VF interrupt initialization cleanup

Set initialization state variable to (reflect interrupt initialization) at
correct time (immediately after having configured interrupts).  This fixes
problem of inconsistent IRQ allocation in case of [obscure] failure when
negotiating with PF driver during init.

Clean-up of interrupt enablement during initialization & avoid potential
race condition with chip-specific code (i.e. perform interrupt control in
main driver module).  Added explanatory comments regarding interrupt
enablement.

Signed-off-by: Rick Farrington <ricardo.farrington@cavium.com>
Signed-off-by: Satanand Burla <satananda.burla@cavium.com>
Signed-off-by: Felix Manlunas <felix.manlunas@cavium.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/cavium/liquidio/cn23xx_vf_device.c

@@ -431,11 +431,6 @@ int cn23xx_octeon_pfvf_handshake(struct octeon_device *oct)
 	mbox_cmd.fn = (octeon_mbox_callback_t)octeon_pfvf_hs_callback;
 	mbox_cmd.fn_arg = &status;
 
-	/* Interrupts are not enabled at this point.
-	 * Enable them with default oq ticks
-	 */
-	oct->fn_list.enable_interrupt(oct, OCTEON_ALL_INTR);
-
 	octeon_mbox_write(oct, &mbox_cmd);
 
 	atomic_set(&status, 0);
@@ -444,11 +439,6 @@ int cn23xx_octeon_pfvf_handshake(struct octeon_device *oct)
 		schedule_timeout_uninterruptible(1);
 	} while ((!atomic_read(&status)) && (count++ < 100000));
 
-	/* Disable the interrupt so that the interrupsts will be reenabled
-	 * with the oq ticks received from the PF
-	 */
-	oct->fn_list.disable_interrupt(oct, OCTEON_ALL_INTR);
-
 	ret = atomic_read(&status);
 	if (!ret) {
 		dev_err(&oct->pci_dev->dev, "octeon_pfvf_handshake timeout\n");

drivers/net/ethernet/cavium/liquidio/lio_vf_main.c

@@ -3188,13 +3188,28 @@ static int octeon_device_init(struct octeon_device *oct)
 	if (octeon_setup_interrupt(oct))
 		return 1;
 
-	if (cn23xx_octeon_pfvf_handshake(oct))
-		return 1;
+	atomic_set(&oct->status, OCT_DEV_INTR_SET_DONE);
+
+	/* ***************************************************************
+	 * The interrupts need to be enabled for the PF<-->VF handshake.
+	 * They are [re]-enabled after the PF<-->VF handshake so that the
+	 * correct OQ tick value is used (i.e. the value retrieved from
+	 * the PF as part of the handshake).
+	 */
 
 	/* Enable Octeon device interrupts */
 	oct->fn_list.enable_interrupt(oct, OCTEON_ALL_INTR);
 
-	atomic_set(&oct->status, OCT_DEV_INTR_SET_DONE);
+	if (cn23xx_octeon_pfvf_handshake(oct))
+		return 1;
+
+	/* Here we [re]-enable the interrupts so that the correct OQ tick value
+	 * is used (i.e. the value that was retrieved during the handshake)
+	 */
+
+	/* Enable Octeon device interrupts */
+	oct->fn_list.enable_interrupt(oct, OCTEON_ALL_INTR);
+	/* *************************************************************** */
 
 	/* Enable the input and output queues for this Octeon device */
 	if (oct->fn_list.enable_io_queues(oct)) {