Re: [PATCH 1/2] app/testpmd: fix quit testpmd with vfs and pf

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

On 2/17/2022 10:14 AM, wenxuanx.wu@intel.com wrote:
> From: wenxuan wu <wenxuanx.wu@intel.com>
> 
> 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 that release our allocated ports in reverse
> order,add two macros RTE_ETH_FOREACH_DEV_REVERSE_OWNED_BY and
> RTE_ETH_FOREACH_DEV_REVERSE,which would be used in quit procedure of
> testpmd, error is fixed.
> 
> Fixes: d3a274ce9dee ("app/testpmd: handle SIGINT and SIGTERM")
> Cc: stable@dpdk.org
> 
> Signed-off-by: wenxuan wu <wenxuanx.wu@intel.com>
> ---
>   app/test-pmd/testpmd.c | 4 ++--
>   1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/app/test-pmd/testpmd.c b/app/test-pmd/testpmd.c
> index e1da961311..698b6d8cc4 100644
> --- a/app/test-pmd/testpmd.c
> +++ b/app/test-pmd/testpmd.c
> @@ -3384,12 +3384,12 @@ pmd_test_exit(void)
>   #endif
>   	if (ports != NULL) {
>   		no_link_check = 1;
> -		RTE_ETH_FOREACH_DEV(pt_id) {
> +		RTE_ETH_FOREACH_DEV_REVERSE(pt_id) {

This fix assumes PF is always probed before VFs (so PF has smaller
port id than VF).

I am not sure if this is guaranteed, ports ported based on scan
in the sysfs folder.

Instead, what do you think PF port stop/close fail when there
are still VFs probed? I think PF driver can know if there are
VFs ported.

>   			printf("\nStopping port %d...\n", pt_id);
>   			fflush(stdout);
>   			stop_port(pt_id);
>   		}
> -		RTE_ETH_FOREACH_DEV(pt_id) {
> +		RTE_ETH_FOREACH_DEV_REVERSE(pt_id) {
>   			printf("\nShutting down port %d...\n", pt_id);
>   			fflush(stdout);
>   			close_port(pt_id);