[dpdk-dev] [PATCH 3/3] net/enic: enable link check interrupts

[Nelson Escobar <neescoba@cisco.com>]

Signed-off-by: Nelson Escobar <neescoba@cisco.com>
Reviewed-by: John Daley <johndale@cisco.com>
---
 doc/guides/nics/enic.rst       |  3 ++-
 drivers/net/enic/enic_ethdev.c |  2 +-
 drivers/net/enic/enic_main.c   | 19 ++++++++++++++++++-
 3 files changed, 21 insertions(+), 3 deletions(-)

diff --git a/doc/guides/nics/enic.rst b/doc/guides/nics/enic.rst
index 42e781e..8170286 100644
--- a/doc/guides/nics/enic.rst
+++ b/doc/guides/nics/enic.rst
@@ -76,7 +76,8 @@ Configuration information
 
     Only one interrupt per vNIC interface should be configured in the UCS
     manager regardless of the number receive/transmit queues. The ENIC PMD
-    uses this interrupt to   get information about errors in the fast path.
+    uses this interrupt to get information about link status and errors
+    in the fast path.
 
 Limitations
 -----------
diff --git a/drivers/net/enic/enic_ethdev.c b/drivers/net/enic/enic_ethdev.c
index e10c824..44105d6 100644
--- a/drivers/net/enic/enic_ethdev.c
+++ b/drivers/net/enic/enic_ethdev.c
@@ -607,7 +607,7 @@ static struct eth_driver rte_enic_pmd = {
 	.pci_drv = {
 		.name = "rte_enic_pmd",
 		.id_table = pci_id_enic_map,
-		.drv_flags = RTE_PCI_DRV_NEED_MAPPING,
+		.drv_flags = RTE_PCI_DRV_NEED_MAPPING | RTE_PCI_DRV_INTR_LSC,
 	},
 	.eth_dev_init = eth_enicpmd_dev_init,
 	.dev_private_size = sizeof(struct enic),
diff --git a/drivers/net/enic/enic_main.c b/drivers/net/enic/enic_main.c
index aaf47e6..55c7217 100644
--- a/drivers/net/enic/enic_main.c
+++ b/drivers/net/enic/enic_main.c
@@ -430,10 +430,13 @@ static void
 enic_intr_handler(__rte_unused struct rte_intr_handle *handle,
 	void *arg)
 {
-	struct enic *enic = pmd_priv((struct rte_eth_dev *)arg);
+	struct rte_eth_dev *dev = (struct rte_eth_dev *)arg;
+	struct enic *enic = pmd_priv(dev);
 
 	vnic_intr_return_all_credits(&enic->intr);
 
+	enic_link_update(enic);
+	_rte_eth_dev_callback_process(dev, RTE_ETH_EVENT_INTR_LSC);
 	enic_log_q_error(enic);
 }
 
@@ -447,6 +450,13 @@ int enic_enable(struct enic *enic)
 	eth_dev->data->dev_link.link_duplex = ETH_LINK_FULL_DUPLEX;
 	vnic_dev_notify_set(enic->vdev, -1); /* No Intr for notify */
 
+	/* vnic notification of link status has already been turned on in
+	 * enic_dev_init() which is called during probe time.  Here we are
+	 * just turning on interrupt vector 0 if needed.
+	 */
+	if (eth_dev->data->dev_conf.intr_conf.lsc)
+		vnic_dev_notify_set(enic->vdev, 0);
+
 	if (enic_clsf_init(enic))
 		dev_warning(enic, "Init of hash table for clsf failed."\
 			"Flow director feature will not work\n");
@@ -838,6 +848,13 @@ int enic_disable(struct enic *enic)
 		}
 	}
 
+	/* If we were using interrupts, set the interrupt vector to -1
+	 * to disable interrupts.  We are not disabling link notifcations,
+	 * though, as we want the polling of link status to continue working.
+	 */
+	if (enic->rte_dev->data->dev_conf.intr_conf.lsc)
+		vnic_dev_notify_set(enic->vdev, -1);
+
 	vnic_dev_set_reset_flag(enic->vdev, 1);
 	vnic_dev_notify_unset(enic->vdev);
 
-- 
2.7.0