net/i40e all packets dropped after rte_eth_dev_flow_ctrl_set

https://bugs.dpdk.org/show_bug.cgi?id=1138

            Bug ID: 1138
           Summary: net/i40e all packets dropped after
                    rte_eth_dev_flow_ctrl_set
           Product: DPDK
           Version: 21.11
          Hardware: All
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: ethdev
          Assignee: [email protected]
          Reporter: [email protected]

Target Milestone: ---

My program call rte_eth_dev_flow_ctrl_set after rte_eth_dev_start. I found that x710 dropped all packets(rx_dropped_packets in xstats).
I have used testpmd to confirm the problem:

index da29858..eb11789 100755
@@ -2928,6 +2928,16 @@ struct extmem_param {
                        continue;
                }
 
+               {
+                       struct rte_eth_fc_conf fc_conf = {
+                               .autoneg = 0,
+                               .mode = RTE_FC_NONE,
+                       };
+
+                       if (!rte_eth_dev_flow_ctrl_set(pi, &fc_conf))
+                               printf("set port %d flow ctrl\n", pi);
+               }
+
                if (port->port_status == RTE_PORT_HANDLING)
                        port->port_status = RTE_PORT_STARTED;
                else

If I stop and start the port again, packet will be received as good.

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