net/i40e: fix virtchnl message response timeout

PF driver and VF driver communicated with each other by virtual
channel message. When VF sends message to PF to enable some
offload capability, PF should response if it is successful or not.
VIRTCHNL_OP_ENABLE_VLAN_STRIPPING is a new added message and the
old PF driver doesn’t support that. So no response is received by
DPDK VF. Then VF is blocked on this message and cannot roll back.
This patch clears pending command on VF side when the waiting duration
expires to avoid blocking following communication.

Fixes: 5f0b95d59a98 ("net/i40e: support VLAN stripping for VF")
Cc: stable@dpdk.org
Signed-off-by: Beilei Xing <beilei.xing@intel.com>

diff --git a/drivers/net/i40e/i40e_ethdev_vf.c b/drivers/net/i40e/i40e_ethdev_vf.c
index dc6c794..62dea59 100644 (file)
--- a/drivers/net/i40e/i40e_ethdev_vf.c
+++ b/drivers/net/i40e/i40e_ethdev_vf.c
@@ -391,6 +391,11 @@ i40evf_execute_vf_cmd(struct rte_eth_dev *dev, struct vf_cmd_info *args)
                        rte_delay_ms(ASQ_DELAY_MS);
                        /* If don't read msg or read sys event, continue */
                } while (i++ < MAX_TRY_TIMES);
+               /* If there's no response is received, clear command */
+               if (i >= MAX_TRY_TIMES) {
+                       PMD_DRV_LOG(WARNING, "No response for %d", args->ops);
+                       _clear_cmd(vf);
+               }
                break;
        }