[PATCH] app/testpmd: fix testpmd crash when quit with mlx5 avail_thresh enabled

[Singh, Aman Deep]

On 10/24/2022 8:44 AM, Spike Du wrote:
> When testpmd quit with mlx5 avail_thresh enabled, a rte timer handler
> delays to reconfigure rx queue to re-arm this event. However at the same
> time, testpmd is destroying rx queues.
> It's never a valid use case for mlx5 avail_thresh. Before testpmd quit,
> user should disable avail_thresh configuration to not handle the events.
> This is documented in mlx5 driver guide.
>
> To avoid the crash in such use case, check port status, if it is not
> RTE_PORT_STARTED, don't process the avail_thresh event.
>
> Fixes: 0edfc9b08316 ("app/testpmd: add Host Shaper command")
>
> Signed-off-by: Spike Du <spiked at nvidia.com>

Acked-by: Aman Singh<aman.deep.singh at intel.com>

> ---
>   drivers/net/mlx5/mlx5_testpmd.c | 9 +++++++++
>   1 file changed, 9 insertions(+)
>
> diff --git a/drivers/net/mlx5/mlx5_testpmd.c b/drivers/net/mlx5/mlx5_testpmd.c
> index ed84583..1a9ec78 100644
> --- a/drivers/net/mlx5/mlx5_testpmd.c
> +++ b/drivers/net/mlx5/mlx5_testpmd.c
> @@ -25,6 +25,7 @@
>   
>   static uint8_t host_shaper_avail_thresh_triggered[RTE_MAX_ETHPORTS];
>   #define SHAPER_DISABLE_DELAY_US 100000 /* 100ms */
> +extern struct rte_port *ports;

This might not be needed, as we have testpmd.h included.

>   
>   /**
>    * Disable the host shaper and re-arm available descriptor threshold event.
> @@ -39,7 +40,15 @@
>   	uint16_t port_id = port_rxq_id & 0xffff;
>   	uint16_t qid = (port_rxq_id >> 16) & 0xffff;
>   	struct rte_eth_rxq_info qinfo;
> +	struct rte_port *port;
>   
> +	port = &ports[port_id];
> +	if (port->port_status != RTE_PORT_STARTED) {
> +		printf("%s port_status(%d) is incorrect, stop avail_thresh "
> +		       "event processing.\n",
> +		       __func__, port->port_status);
> +		return;
> +	}
>   	printf("%s disable shaper\n", __func__);
>   	if (rte_eth_rx_queue_info_get(port_id, qid, &qinfo)) {
>   		printf("rx_queue_info_get returns error\n");