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From: bugzilla@dpdk.org
To: dev@dpdk.org
Subject: [Bug 1138] net/i40e all packets dropped after
 rte_eth_dev_flow_ctrl_set
Date: Thu, 01 Dec 2022 02:30:47 +0000
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X-Bugzilla-Component: ethdev
X-Bugzilla-Version: 21.11
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https://bugs.dpdk.org/show_bug.cgi?id=3D1138

            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: dev@dpdk.org
          Reporter: hanshuang87@gmail.com
  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:

diff --git a/app/test-pmd/testpmd.c b/app/test-pmd/testpmd.c
index da29858..eb11789 100755
--- a/app/test-pmd/testpmd.c
+++ b/app/test-pmd/testpmd.c
@@ -2928,6 +2928,16 @@ struct extmem_param {
                        continue;
                }

+               {
+                       struct rte_eth_fc_conf fc_conf =3D {
+                               .autoneg =3D 0,
+                               .mode =3D 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 =3D=3D RTE_PORT_HANDLING)
                        port->port_status =3D RTE_PORT_STARTED;
                else

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

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