net/i40e: fix intr callback unregister by adding retry

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")
Cc: stable@dpdk.org
Signed-off-by: Yunjian Wang <wangyunjian@huawei.com>
Reviewed-by: Kirill Rybalchenko <kirill.rybalchenko@intel.com>
Acked-by: Qi Zhang <qi.z.zhang@intel.com>

diff --git a/drivers/net/i40e/i40e_ethdev.c b/drivers/net/i40e/i40e_ethdev.c
index f9408b0..d0bf4e3 100644 (file)
--- a/drivers/net/i40e/i40e_ethdev.c
+++ b/drivers/net/i40e/i40e_ethdev.c
@@ -1505,6 +1505,7 @@ eth_i40e_dev_uninit(struct rte_eth_dev *dev)
        struct rte_flow *p_flow;
        int ret;
        uint8_t aq_fail = 0;
+       int retries = 0;
 
        PMD_INIT_FUNC_TRACE();
 
@@ -1546,9 +1547,20 @@ eth_i40e_dev_uninit(struct rte_eth_dev *dev)
        /* 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(500);
+       } while (retries++ < 5);
 
        i40e_rm_ethtype_filter_list(pf);
        i40e_rm_tunnel_filter_list(pf);