Re: [PATCH 3/5] app/proc-info: fix never show RSS info

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

On 3/15/2023 11:00 AM, Dongdong Liu wrote:

> From: Jie Hai <haijie1@huawei.com>
> 
> Command show-port shows rss info only if rss_conf.rss_key
> is not null but it will never be true. This patch allocates
> memory for rss_conf.rss_key and makes it possible to show
> rss info.
> 

Why 'rss_conf.rss_key == NULL' case is never true?

'rss_key' is pointer and 'rte_eth_dev_rss_hash_conf_get()' doesn't
allocate it, so can't it be NULL?


> Fixes: 8a37f37fc243 ("app/procinfo: add --show-port")
> Cc: stable@dpdk.org
> 
> Signed-off-by: Jie Hai <haijie1@huawei.com>
> Signed-off-by: Dongdong Liu <liudongdong3@huawei.com>
> ---
>  app/proc-info/main.c | 26 +++++++++++++++++---------
>  1 file changed, 17 insertions(+), 9 deletions(-)
> 
> diff --git a/app/proc-info/main.c b/app/proc-info/main.c
> index 53e852a07c..878ce37e8b 100644
> --- a/app/proc-info/main.c
> +++ b/app/proc-info/main.c
> @@ -823,6 +823,7 @@ show_port(void)
>                 struct rte_eth_fc_conf fc_conf;
>                 struct rte_ether_addr mac;
>                 struct rte_eth_dev_owner owner;
> +               uint8_t *rss_key;
> 
>                 /* Skip if port is not in mask */
>                 if ((enabled_port_mask & (1ul << i)) == 0)
> @@ -981,19 +982,26 @@ show_port(void)
>                         printf("\n");
>                 }
> 
> +               rss_key = rte_malloc(NULL,
> +                       dev_info.hash_key_size * sizeof(uint8_t), 0);
> +               if (rss_key == NULL)
> +                       return;
> +
> +               rss_conf.rss_key = rss_key;
> +               rss_conf.rss_key_len = dev_info.hash_key_size;
>                 ret = rte_eth_dev_rss_hash_conf_get(i, &rss_conf);
>                 if (ret == 0) {
> -                       if (rss_conf.rss_key) {
> -                               printf("  - RSS\n");
> -                               printf("\t  -- RSS len %u key (hex):",
> -                                               rss_conf.rss_key_len);
> -                               for (k = 0; k < rss_conf.rss_key_len; k++)
> -                                       printf(" %x", rss_conf.rss_key[k]);
> -                               printf("\t  -- hf 0x%"PRIx64"\n",
> -                                               rss_conf.rss_hf);
> -                       }
> +                       printf("  - RSS\n");
> +                       printf("\t  -- RSS len %u key (hex):",
> +                                       rss_conf.rss_key_len);
> +                       for (k = 0; k < rss_conf.rss_key_len; k++)
> +                               printf(" %x", rss_conf.rss_key[k]);
> +                       printf("\t  -- hf 0x%"PRIx64"\n",
> +                                       rss_conf.rss_hf);
>                 }
> 
> +               rte_free(rss_key);
> +
>  #ifdef RTE_LIB_SECURITY
>                 show_security_context(i, true);
>  #endif
> --
> 2.22.0
>