[PATCH v3] net/idpf: fix crash when launching l3fwd

[beilei.xing at intel.com]

From: Beilei Xing <beilei.xing at intel.com>

There's core dump when launching l3fwd with 1 queue 1 core. It's
because NULL pointer is used if fail to configure device.
This patch removes incorrect check during device configuration,
and checks NULL pointer when executing VIRTCHNL2_OP_DEALLOC_VECTORS.

Fixes: 549343c25db8 ("net/idpf: support device initialization")
Fixes: 70675bcc3a57 ("net/idpf: support RSS")
Fixes: 37291a68fd78 ("net/idpf: support write back based on ITR expire")

Signed-off-by: Beilei Xing <beilei.xing at intel.com>
---
v2 change: fix typo.
v3 change: check NULL pointer before virtual channel handling.

 drivers/net/idpf/idpf_ethdev.c | 10 ++--------
 1 file changed, 2 insertions(+), 8 deletions(-)

diff --git a/drivers/net/idpf/idpf_ethdev.c b/drivers/net/idpf/idpf_ethdev.c
index 20f088eb80..491ef966a7 100644
--- a/drivers/net/idpf/idpf_ethdev.c
+++ b/drivers/net/idpf/idpf_ethdev.c
@@ -372,13 +372,6 @@ idpf_dev_configure(struct rte_eth_dev *dev)
 		return -ENOTSUP;
 	}
 
-	if ((dev->data->nb_rx_queues == 1 && conf->rxmode.mq_mode != RTE_ETH_MQ_RX_NONE) ||
-	    (dev->data->nb_rx_queues > 1 && conf->rxmode.mq_mode != RTE_ETH_MQ_RX_RSS)) {
-		PMD_INIT_LOG(ERR, "Multi-queue packet distribution mode %d is not supported",
-			     conf->rxmode.mq_mode);
-		return -ENOTSUP;
-	}
-
 	if (conf->txmode.mq_mode != RTE_ETH_MQ_TX_NONE) {
 		PMD_INIT_LOG(ERR, "Multi-queue TX mode %d is not supported",
 			     conf->txmode.mq_mode);
@@ -620,7 +613,8 @@ idpf_dev_stop(struct rte_eth_dev *dev)
 
 	idpf_vc_config_irq_map_unmap(vport, false);
 
-	idpf_vc_dealloc_vectors(vport);
+	if (vport->recv_vectors != NULL)
+		idpf_vc_dealloc_vectors(vport);
 
 	vport->stopped = 1;
 
-- 
2.26.2