[dpdk-dev] [PATCH 2/2] net/virtio: register/unregister intr handler on start/stop

["Charles (Chas) Williams" <ciwillia@brocade.com>]

From: Brian Russell <brussell@brocade.com>

Register and unregister the virtio interrupt handler when the device is
started and stopped.

Signed-off-by: Brian Russell <brussell@brocade.com>
---
 drivers/net/virtio/virtio_ethdev.c | 26 +++++++++++++++-----------
 1 file changed, 15 insertions(+), 11 deletions(-)

diff --git a/drivers/net/virtio/virtio_ethdev.c b/drivers/net/virtio/virtio_ethdev.c
index eff0545..103e778 100644
--- a/drivers/net/virtio/virtio_ethdev.c
+++ b/drivers/net/virtio/virtio_ethdev.c
@@ -1581,11 +1581,6 @@ eth_virtio_dev_init(struct rte_eth_dev *eth_dev)
 	if (ret < 0)
 		return ret;
 
-	/* Setup interrupt callback  */
-	if (eth_dev->data->dev_flags & RTE_ETH_DEV_INTR_LSC)
-		rte_intr_callback_register(eth_dev->intr_handle,
-			virtio_interrupt_handler, eth_dev);
-
 	return 0;
 }
 
@@ -1607,11 +1602,6 @@ eth_virtio_dev_uninit(struct rte_eth_dev *eth_dev)
 	rte_free(eth_dev->data->mac_addrs);
 	eth_dev->data->mac_addrs = NULL;
 
-	/* reset interrupt callback  */
-	if (eth_dev->data->dev_flags & RTE_ETH_DEV_INTR_LSC)
-		rte_intr_callback_unregister(eth_dev->intr_handle,
-						virtio_interrupt_handler,
-						eth_dev);
 	if (eth_dev->device)
 		rte_pci_unmap_device(RTE_ETH_DEV_TO_PCI(eth_dev));
 
@@ -1730,6 +1720,12 @@ virtio_dev_start(struct rte_eth_dev *dev)
 	    dev->data->dev_conf.intr_conf.rxq) {
 		rte_intr_disable(dev->intr_handle);
 
+		/* Setup interrupt callback  */
+		if (dev->data->dev_flags & RTE_ETH_DEV_INTR_LSC)
+			rte_intr_callback_register(dev->intr_handle,
+						   virtio_interrupt_handler,
+						   dev);
+
 		if (rte_intr_enable(dev->intr_handle) < 0) {
 			PMD_DRV_LOG(ERR, "interrupt enable failed");
 			return -EIO;
@@ -1834,9 +1830,17 @@ virtio_dev_stop(struct rte_eth_dev *dev)
 		return;
 	hw->started = false;
 
-	if (intr_conf->lsc || intr_conf->rxq)
+	if (intr_conf->lsc || intr_conf->rxq) {
 		rte_intr_disable(dev->intr_handle);
 
+		/* Reset interrupt callback  */
+		if (dev->data->dev_flags & RTE_ETH_DEV_INTR_LSC) {
+			rte_intr_callback_unregister(dev->intr_handle,
+						     virtio_interrupt_handler,
+						     dev);
+		}
+	}
+
 	memset(&link, 0, sizeof(link));
 	virtio_dev_atomic_write_link_status(dev, &link);
 }
-- 
2.1.4