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

[wangyunjian]

From: Yunjian Wang <wangyunj...@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 <wangyunj...@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