[dpdk-dev] [PATCH] bonding: fix bond link detect in non-interrupt mode

[John Daley <johndale@cisco.com>]

From: Nelson Escobar <neescoba@cisco.com>

Stopping then re-starting a bond interface containing slaves that
used polling for link detection caused the bond to think all slave
links were down and inactive.

Move the start of the polling for link from slave_add() to
bond_ethdev_start() and in bond_ethdev_stop() make sure we clear
the last_link_status of the slaves.

Signed-off-by: Nelson Escobar <neescoba@cisco.com>
Signed-off-by: John Daley <johndale@cisco.com>
---
 drivers/net/bonding/rte_eth_bond_pmd.c | 27 +++++++++++++++++----------
 1 file changed, 17 insertions(+), 10 deletions(-)

diff --git a/drivers/net/bonding/rte_eth_bond_pmd.c b/drivers/net/bonding/rte_eth_bond_pmd.c
index fb26d35..f0960c6 100644
--- a/drivers/net/bonding/rte_eth_bond_pmd.c
+++ b/drivers/net/bonding/rte_eth_bond_pmd.c
@@ -1454,18 +1454,11 @@ slave_add(struct bond_dev_private *internals,
 	slave_details->port_id = slave_eth_dev->data->port_id;
 	slave_details->last_link_status = 0;
 
-	/* If slave device doesn't support interrupts then we need to enabled
-	 * polling to monitor link status */
+	/* Mark slave devices that don't support interrupts so we can
+	 * compensate when we start the bond
+	 */
 	if (!(slave_eth_dev->data->dev_flags & RTE_ETH_DEV_INTR_LSC)) {
 		slave_details->link_status_poll_enabled = 1;
-
-		if (!internals->link_status_polling_enabled) {
-			internals->link_status_polling_enabled = 1;
-
-			rte_eal_alarm_set(internals->link_status_polling_interval_ms * 1000,
-					bond_ethdev_slave_link_status_change_monitor,
-					(void *)&rte_eth_devices[internals->port_id]);
-		}
 	}
 
 	slave_details->link_status_wait_to_complete = 0;
@@ -1550,6 +1543,18 @@ bond_ethdev_start(struct rte_eth_dev *eth_dev)
 					eth_dev->data->port_id, internals->slaves[i].port_id);
 			return -1;
 		}
+		/* We will need to poll for link status if any slave doesn't
+		 * support interrupts
+		 */
+		if (internals->slaves[i].link_status_poll_enabled)
+			internals->link_status_polling_enabled = 1;
+	}
+	/* start polling if needed */
+	if (internals->link_status_polling_enabled) {
+		rte_eal_alarm_set(
+			internals->link_status_polling_interval_ms * 1000,
+			bond_ethdev_slave_link_status_change_monitor,
+			(void *)&rte_eth_devices[internals->port_id]);
 	}
 
 	if (internals->user_defined_primary_port)
@@ -1622,6 +1627,8 @@ bond_ethdev_stop(struct rte_eth_dev *eth_dev)
 
 	internals->active_slave_count = 0;
 	internals->link_status_polling_enabled = 0;
+	for (i = 0; i < internals->slave_count; i++)
+		internals->slaves[i].last_link_status = 0;
 
 	eth_dev->data->dev_link.link_status = 0;
 	eth_dev->data->dev_started = 0;
-- 
2.7.0