[dpdk-stable] [PATCH v3] net/i40e: fix FDIR check programming status error

[Zhao Wei]

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 at intel.com>

---

v2:
-fix patch error in ret value set.

v3:
-fix patch check warning.
---
 drivers/net/i40e/i40e_fdir.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/i40e/i40e_fdir.c b/drivers/net/i40e/i40e_fdir.c
index d41601a..2b299c7 100644
--- 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;
-- 
2.7.5