[PATCH] examples/vdpa: fix disabled VirtQ statistics query

[Maxime Coquelin]

"examples/vdpa: fix disabled virtqueue statistics query"

On 2/24/22 14:24, Xueming Li wrote:
> Quit VirtQ statistics query instead of reporting error.
> 
> Fixes: 6505865aa8ed ("examples/vdpa: add statistics show command")
> Cc: stable at dpdk.org
> 
> Signed-off-by: Xueming Li <xuemingl at nvidia.com>
> ---
>   examples/vdpa/main.c | 21 +++++++++++++++++++--
>   1 file changed, 19 insertions(+), 2 deletions(-)
> 
> diff --git a/examples/vdpa/main.c b/examples/vdpa/main.c
> index 5ab07655aed..bd66deca85c 100644
> --- a/examples/vdpa/main.c
> +++ b/examples/vdpa/main.c
> @@ -391,7 +391,9 @@ static void cmd_device_stats_parsed(void *parsed_result, struct cmdline *cl,
>   	struct rte_vdpa_device *vdev = rte_vdpa_find_device_by_name(res->bdf);
>   	struct vdpa_port *vport = NULL;
>   	uint32_t first, last;
> +	int vq_disabled = -1;
>   	int i;
> +	int ret;
>   
>   	if (!vdev) {
>   		RTE_LOG(ERR, VDPA, "Invalid device: %s.\n",
> @@ -449,8 +451,20 @@ static void cmd_device_stats_parsed(void *parsed_result, struct cmdline *cl,
>   	cmdline_printf(cl, "\nDevice %s:\n", res->bdf);
>   	for (; first <= last; first++) {
>   		memset(vport->stats, 0, sizeof(*vport->stats) * vport->stats_n);
> -		if (rte_vdpa_get_stats(vport->dev, (int)first, vport->stats,
> -					vport->stats_n) <= 0) {
> +		ret = rte_vdpa_get_stats(vport->dev, (int)first, vport->stats,
> +						vport->stats_n);
> +		if (ret == 0) {
> +			/* VQ disabled. */
> +			if (vq_disabled == -1)
> +				vq_disabled = (int)first;
> +			continue;
> +		}
> +		if (vq_disabled != -1) {
> +			cmdline_printf(cl, "\tVirtq %d - %d disabled\n",
> +				       vq_disabled, (int)first - 1);
> +			vq_disabled = -1;
> +		}
> +		if (ret < 0) {
>   			RTE_LOG(ERR, VDPA, "Failed to get vdpa queue statistics"
>   				" for device %s qid %d.\n", res->bdf,
>   				(int)first);
> @@ -464,6 +478,9 @@ static void cmd_device_stats_parsed(void *parsed_result, struct cmdline *cl,
>   				vport->stats[i].value);
>   		}
>   	}
> +	if (vq_disabled != -1)
> +		cmdline_printf(cl, "\tVirtq %d - %d disabled\n",
> +			       vq_disabled, (int)first - 1);
>   }
>   
>   cmdline_parse_token_string_t cmd_device_stats_ =

It is not clear to me how it is going to look like, could you paste some
logs?