[dpdk-dev] [PATCH] i40e: Fix the clean up function for i40e, the DD bits are multiplex with descriptor type field. so cannot use "not zero" as the rule for the completion of Tx descriptor

[Zhe Tao]

If the descriptor in the position desc_to_clean_to is the context descriptor 
its type will be 0x1, so using the not expression, the device driver will 
consider the descriptor has been complete for transmission even its DTYPE field 
is still 0x1 which means NIC has't finished the operation on this descriptor. 

Signed-off-by: Zhe Tao <zhe.tao at intel.com>
---
 drivers/net/i40e/i40e_rxtx.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/net/i40e/i40e_rxtx.c b/drivers/net/i40e/i40e_rxtx.c
index 2de0ac4..5d33f62 100644
--- a/drivers/net/i40e/i40e_rxtx.c
+++ b/drivers/net/i40e/i40e_rxtx.c
@@ -574,8 +574,9 @@ i40e_xmit_cleanup(struct i40e_tx_queue *txq)
                desc_to_clean_to = (uint16_t)(desc_to_clean_to - nb_tx_desc);

        desc_to_clean_to = sw_ring[desc_to_clean_to].last_id;
-       if (!(txd[desc_to_clean_to].cmd_type_offset_bsz &
-               rte_cpu_to_le_64(I40E_TX_DESC_DTYPE_DESC_DONE))) {
+       if ((txd[desc_to_clean_to].cmd_type_offset_bsz &
+               rte_cpu_to_le_64(I40E_TXD_QW1_DTYPE_MASK)) !=
+               rte_cpu_to_le_64(I40E_TX_DESC_DTYPE_DESC_DONE)) {
                PMD_TX_FREE_LOG(DEBUG, "TX descriptor %4u is not done "
                        "(port=%d queue=%d)", desc_to_clean_to,
                                txq->port_id, txq->queue_id);
-- 
1.8.4.2