[PATCH] net/cnxk: fix crash during hotplug detach operation

[<skori@marvell.com>]

From: Sunil Kumar Kori <skori@marvell.com>

hot_plug application does not perform any port setup
configuration via rte_eth_dev_configure() API. All the probed
Ethernet ports do not contain any Rx and Tx queues.

While detaching a device via rte_eal_hotplug_remove(), CNXK
driver expects Rx and Tx queues structures populated during
reset of PFC. So application gets crashed as data->rx_queues
and data->tx_queues are NULL.

Fixes: 9544713564f5 ("net/cnxk: support priority flow control")

Signed-off-by: Sunil Kumar Kori <skori@marvell.com>
---
 drivers/net/cnxk/cnxk_ethdev_ops.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/net/cnxk/cnxk_ethdev_ops.c b/drivers/net/cnxk/cnxk_ethdev_ops.c
index f4a0562475..15d8e8efa6 100644
--- a/drivers/net/cnxk/cnxk_ethdev_ops.c
+++ b/drivers/net/cnxk/cnxk_ethdev_ops.c
@@ -1069,6 +1069,11 @@ nix_priority_flow_ctrl_configure(struct rte_eth_dev *eth_dev,
 	rx_pause = (mode == RTE_ETH_FC_FULL) || (mode == RTE_ETH_FC_RX_PAUSE);
 	tx_pause = (mode == RTE_ETH_FC_FULL) || (mode == RTE_ETH_FC_TX_PAUSE);
 
+	if (data->rx_queues == NULL || data->tx_queues == NULL) {
+		rc = 0;
+		goto exit;
+	}
+
 	/* Configure CQs */
 	memset(&fc_cfg, 0, sizeof(struct roc_nix_fc_cfg));
 	rxq = ((struct cnxk_eth_rxq_sp *)data->rx_queues[conf->rx_qid]) - 1;
-- 
2.25.1