[dpdk-dev] [PATCH v3] net/i40e: fix intr callback unregister by adding retry

[wangyunjian <wangyunjian@huawei.com>]

From: Yunjian Wang <wangyunjian@huawei.com>

The nic's interrupt source has some active callbacks, when
the port hotplug. Add a retry to give more port's a chance
to uninit before returning an error.

Fixes: d42aaf30008b ("i40e: support port hotplug")

Signed-off-by: Yunjian Wang <wangyunjian@huawei.com>
---
v2:
* Fix return value check
---
v3:
* Fix comment suggested by Kirill Rybalchenko
---
 drivers/net/i40e/i40e_ethdev.c | 18 +++++++++++++++---
 1 file changed, 15 insertions(+), 3 deletions(-)

diff --git a/drivers/net/i40e/i40e_ethdev.c b/drivers/net/i40e/i40e_ethdev.c
index 508b417..6bb31f6 100644
--- a/drivers/net/i40e/i40e_ethdev.c
+++ b/drivers/net/i40e/i40e_ethdev.c
@@ -1533,6 +1533,7 @@ void i40e_flex_payload_reg_set_default(struct i40e_hw *hw)
 	struct rte_flow *p_flow;
 	int ret;
 	uint8_t aq_fail = 0;
+	int retries = 0;
 
 	PMD_INIT_FUNC_TRACE();
 
@@ -1574,9 +1575,20 @@ void i40e_flex_payload_reg_set_default(struct i40e_hw *hw)
 	/* disable uio intr before callback unregister */
 	rte_intr_disable(intr_handle);
 
-	/* register callback func to eal lib */
-	rte_intr_callback_unregister(intr_handle,
-				     i40e_dev_interrupt_handler, dev);
+	/* unregister callback func to eal lib */
+	do {
+		ret = rte_intr_callback_unregister(intr_handle,
+				i40e_dev_interrupt_handler, dev);
+		if (ret >= 0) {
+			break;
+		} else if (ret != -EAGAIN) {
+			PMD_INIT_LOG(ERR,
+				 "intr callback unregister failed: %d",
+				 ret);
+			return ret;
+		}
+		i40e_msec_delay(100);
+	} while (retries++ < 5);
 
 	i40e_rm_ethtype_filter_list(pf);
 	i40e_rm_tunnel_filter_list(pf);
-- 
1.8.3.1