net/i40e: fix check of flow director programming status

In i40e FDIR PMD code for checking programming status
function i40e_check_fdir_programming_status(), the initial value
of return value ret should be set to -1 not 0, because if DD bit of
I40E_RX_DESC_STATUS_DD is not write back, this function will return
0 to upper function, this give an error info to upper function, the
fact for this is it is time out for DD write back and it should return
-1.

Fixes: 05999aab4ca6 ("i40e: add or delete flow director")
Cc: stable@dpdk.org
Signed-off-by: Wei Zhao <wei.zhao1@intel.com>
Acked-by: Qi Zhang <qi.z.zhang@intel.com>

diff --git a/drivers/net/i40e/i40e_fdir.c b/drivers/net/i40e/i40e_fdir.c
index d41601a..2b299c7 100644 (file)
--- a/drivers/net/i40e/i40e_fdir.c
+++ b/drivers/net/i40e/i40e_fdir.c
@@ -1360,6 +1360,8 @@ i40e_check_fdir_programming_status(struct i40e_rx_queue *rxq)
                        I40E_PCI_REG_WRITE(rxq->qrx_tail, rxq->nb_rx_desc - 1);
                else
                        I40E_PCI_REG_WRITE(rxq->qrx_tail, rxq->rx_tail - 1);
+       } else {
+               ret = -1;
        }
 
        return ret;