[PATCH 01/11] net/txgbe: add Tx queue maximum limit

[Jiawen Wu]

Limit TX queue maximum to 64 when neither VT nor DCB are enabled,
since hardware doesn't support it.

Fixes: 75cbb1f0e8a6 ("net/txgbe: add device configuration")
Cc: sta...@dpdk.org

Signed-off-by: Jiawen Wu <jiawe...@trustnetic.com>
---
 drivers/net/txgbe/txgbe_ethdev.c | 13 +++++++++++++
 drivers/net/txgbe/txgbe_ethdev.h |  1 +
 2 files changed, 14 insertions(+)

diff --git a/drivers/net/txgbe/txgbe_ethdev.c b/drivers/net/txgbe/txgbe_ethdev.c
index 15911a3621..479cd810f8 100644
--- a/drivers/net/txgbe/txgbe_ethdev.c
+++ b/drivers/net/txgbe/txgbe_ethdev.c
@@ -1499,6 +1499,19 @@ txgbe_check_mq_mode(struct rte_eth_dev *dev)
                                return -EINVAL;
                        }
                }
+
+               /*
+                * When DCB/VT is off, maximum number of queues changes
+                */
+               if (dev_conf->txmode.mq_mode == RTE_ETH_MQ_TX_NONE) {
+                       if (nb_tx_q > TXGBE_NONE_MODE_TX_NB_QUEUES) {
+                               PMD_INIT_LOG(ERR,
+                                            "Neither VT nor DCB are enabled, "
+                                            "nb_tx_q > %d.",
+                                            TXGBE_NONE_MODE_TX_NB_QUEUES);
+                               return -EINVAL;
+                       }
+               }
        }
        return 0;
 }
diff --git a/drivers/net/txgbe/txgbe_ethdev.h b/drivers/net/txgbe/txgbe_ethdev.h
index 6b296d6fd1..7feb45d0cf 100644
--- a/drivers/net/txgbe/txgbe_ethdev.h
+++ b/drivers/net/txgbe/txgbe_ethdev.h
@@ -41,6 +41,7 @@
 /*Default value of Max Rx Queue*/
 #define TXGBE_MAX_RX_QUEUE_NUM 128
 #define TXGBE_VMDQ_DCB_NB_QUEUES     TXGBE_MAX_RX_QUEUE_NUM
+#define TXGBE_NONE_MODE_TX_NB_QUEUES 64
 
 #ifndef NBBY
 #define NBBY   8       /* number of bits in a byte */
-- 
2.27.0