Re: [PATCH v2] app/testpmd: fix quit testpmd with vfs and pf

[Ferruh Yigit <ferruh.yigit@xilinx.com>]

On 6/21/2022 10:03 AM, Ke Zhang wrote:
> When testpmd startups with pf and vfs,this error occurs when quitting,
> results in pf is released before vfs ,so the vf would access an
> freed heap memory.
> 
> The solution is two steps:
> 1. Fetch the valid port value from RTE_ETH_FOREACH_DEV.
> 2. free the port in reverse order.
> 
> Fixes: 08fd782b8454 ("app/testpmd: fix quit to stop all ports before close")
> Cc: stable@dpdk.org
> 
> Signed-off-by: Ke Zhang <ke1x.zhang@intel.com>
> ---
>   app/test-pmd/testpmd.c | 27 ++++++++++++++++++++++-----
>   1 file changed, 22 insertions(+), 5 deletions(-)
> 
> diff --git a/app/test-pmd/testpmd.c b/app/test-pmd/testpmd.c
> index 04c39adc21..67b4941942 100644
> --- a/app/test-pmd/testpmd.c
> +++ b/app/test-pmd/testpmd.c
> @@ -3491,17 +3491,34 @@ pmd_test_exit(void)
>   		}
>   	}
>   #endif
> +	portid_t ethports[RTE_MAX_ETHPORTS];
> +	int count;
> +	int index;

Hi Ke,

These variables only used in the 'if' block, to reduce the scope of them 
can you please move them at the very top of the block:

if (ports != NULL) {
	portid_t ethports[RTE_MAX_ETHPORTS];
	int count = 0;
	int index;

	no_link_check = 1;
...

>   	if (ports != NULL) {
>   		no_link_check = 1;
> +		count = 0;
> +
> +		/* Fetch the valid port id from port list*/
>   		RTE_ETH_FOREACH_DEV(pt_id) {
> -			printf("\nStopping port %d...\n", pt_id);
> +			ethports[count] = pt_id;
> +			count++;
> +		}
> +
> +		/*
> +		 * Free the port from Reverse order, as general,
> +		 * PF port < VF port， VF should be free before PF
> +		 * be free.
> +		 */
> +		for (index = count - 1 ; index >= 0 ; index--) {
> +			printf("\nStopping port %d...\n", ethports[index]);
>   			fflush(stdout);
> -			stop_port(pt_id);
> +			stop_port(ethports[index]);
>   		}
> -		RTE_ETH_FOREACH_DEV(pt_id) {
> -			printf("\nShutting down port %d...\n", pt_id);
> +
> +		for (index = count - 1 ; index >= 0 ; index--) {
> +			printf("\nShutting down port %d...\n", ethports[index]);
>   			fflush(stdout);
> -			close_port(pt_id);
> +			close_port(ethports[index]);
>   		}
>   	}
>