virtio: fix crash in statistics functions

This initialisation of nb_rx_queues and nb_tx_queues has been removed
from eth_virtio_dev_init.

The nb_rx_queues and nb_tx_queues were being initialised in
eth_virtio_dev_init before the tx_queues and rx_queues arrays were
allocated.

The arrays are allocated when the ethdev port is configured and the
nb_tx_queues and nb_rx_queues are initialised.

If any of the following functions were called before the ethdev
port was configured there was a segmentation fault because
rx_queues and tx_queues were NULL:

rte_eth_stats_get
rte_eth_stats_reset
rte_eth_xstats_get
rte_eth_xstats_reset

Fixes: 823ad647950a ("virtio: support multiple queues")

Signed-off-by: Bernard Iremonger <bernard.iremonger@intel.com>
Acked-by: Konstantin Ananyev <konstantin.ananyev@intel.com>
Acked-by: Yuanhan Liu <yuanhan.liu@linux.intel.com>

diff --git a/drivers/net/virtio/virtio_ethdev.c b/drivers/net/virtio/virtio_ethdev.c
index ec18fd0..ebefdb4 100644 (file)
--- a/drivers/net/virtio/virtio_ethdev.c
+++ b/drivers/net/virtio/virtio_ethdev.c
@@ -1131,9 +1131,6 @@ eth_virtio_dev_init(struct rte_eth_dev *eth_dev)
                hw->max_tx_queues = 1;
        }
 
-       eth_dev->data->nb_rx_queues = hw->max_rx_queues;
-       eth_dev->data->nb_tx_queues = hw->max_tx_queues;
-
        PMD_INIT_LOG(DEBUG, "hw->max_rx_queues=%d   hw->max_tx_queues=%d",
                        hw->max_rx_queues, hw->max_tx_queues);
        PMD_INIT_LOG(DEBUG, "port %d vendorID=0x%x deviceID=0x%x",