[dpdk-dev] [PATCH] net/i40e: fix FDIR check programming status error

[Wei Zhao <wei.zhao1@intel.com>]

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")
Signed-off-by: Wei Zhao <wei.zhao1@intel.com>
---
 drivers/net/i40e/i40e_fdir.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/i40e/i40e_fdir.c b/drivers/net/i40e/i40e_fdir.c
index d41601a..b958bf6 100644
--- a/drivers/net/i40e/i40e_fdir.c
+++ b/drivers/net/i40e/i40e_fdir.c
@@ -1315,7 +1315,7 @@ i40e_check_fdir_programming_status(struct i40e_rx_queue *rxq)
 	uint32_t rx_status;
 	uint32_t len, id;
 	uint32_t error;
-	int ret = 0;
+	int ret = -1;
 
 	rxdp = &rxq->rx_ring[rxq->rx_tail];
 	qword1 = rte_le_to_cpu_64(rxdp->wb.qword1.status_error_len);
@@ -1360,6 +1360,7 @@ 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);
+		ret = 0;
 	}
 
 	return ret;
-- 
2.7.5