[dpdk-dev] [PATCH v2 2/4] ethdev: prevent changing of nb_q_per_pool in rte_eth_dev_check_mq_mode()

[Pawel Wodkowski <pawelx.wodkowski@intel.com>]

If SRIOV is used and device configuration does not use MQ the
RTE_ETH_DEV_SRIOV(dev).nb_q_per_pool is set to 1 in
rte_eth_dev_check_mq_mode().
This is bad becouse of two reasons:
1. Port reconfiguration from non-MQ mode to MQ mode is impossible
2. Confguring RX and TX side in different way is impossible.

This patch fix first issue by not changing
RTE_ETH_DEV_SRIOV(dev).nb_q_per_pool
and second by comparing nb_q_per_pool separately for RX
(nb_rx_q_per_pool) and
for TX (nb_tx_q_per_pool).

Signed-off-by: Pawel Wodkowski <pawelx.wodkowski@intel.com>
---
 lib/librte_ether/rte_ethdev.c |   16 ++++++++++------
 1 file changed, 10 insertions(+), 6 deletions(-)

diff --git a/lib/librte_ether/rte_ethdev.c b/lib/librte_ether/rte_ethdev.c
index 62d7f6e..85385f8 100644
--- a/lib/librte_ether/rte_ethdev.c
+++ b/lib/librte_ether/rte_ethdev.c
@@ -548,6 +548,9 @@ rte_eth_dev_check_mq_mode(uint8_t port_id, uint16_t nb_rx_q, uint16_t nb_tx_q,
 			return (-EINVAL);
 		}
 
+		uint16_t nb_rx_q_per_pool = RTE_ETH_DEV_SRIOV(dev).nb_q_per_pool;
+		uint16_t nb_tx_q_per_pool = RTE_ETH_DEV_SRIOV(dev).nb_q_per_pool;
+
 		switch (dev_conf->rxmode.mq_mode) {
 		case ETH_MQ_RX_VMDQ_DCB:
 		case ETH_MQ_RX_VMDQ_DCB_RSS:
@@ -580,8 +583,8 @@ rte_eth_dev_check_mq_mode(uint8_t port_id, uint16_t nb_rx_q, uint16_t nb_tx_q,
 		default: /* ETH_MQ_RX_VMDQ_ONLY or ETH_MQ_RX_NONE */
 			/* if nothing mq mode configure, use default scheme */
 			dev->data->dev_conf.rxmode.mq_mode = ETH_MQ_RX_VMDQ_ONLY;
-			if (RTE_ETH_DEV_SRIOV(dev).nb_q_per_pool > 1)
-				RTE_ETH_DEV_SRIOV(dev).nb_q_per_pool = 1;
+			if (nb_rx_q_per_pool > 1)
+				nb_rx_q_per_pool = 1;
 			break;
 		}
 
@@ -596,15 +599,16 @@ rte_eth_dev_check_mq_mode(uint8_t port_id, uint16_t nb_rx_q, uint16_t nb_tx_q,
 		default: /* ETH_MQ_TX_VMDQ_ONLY or ETH_MQ_TX_NONE */
 			/* if nothing mq mode configure, use default scheme */
 			dev->data->dev_conf.txmode.mq_mode = ETH_MQ_TX_VMDQ_ONLY;
+			if (nb_tx_q_per_pool > 1)
+				nb_tx_q_per_pool = 1;
 			break;
 		}
 
 		/* check valid queue number */
-		if ((nb_rx_q > RTE_ETH_DEV_SRIOV(dev).nb_q_per_pool) ||
-		    (nb_tx_q > RTE_ETH_DEV_SRIOV(dev).nb_q_per_pool)) {
+		if (nb_rx_q > nb_rx_q_per_pool || nb_tx_q > nb_tx_q_per_pool) {
 			PMD_DEBUG_TRACE("ethdev port_id=%d SRIOV active, "
-				    "queue number must less equal to %d\n",
-					port_id, RTE_ETH_DEV_SRIOV(dev).nb_q_per_pool);
+					"rx/tx queue number must less or equal to %d/%d\n",
+					port_id, nb_rx_q_per_pool, nb_tx_q_per_pool);
 			return (-EINVAL);
 		}
 	} else {
-- 
1.7.9.5