[2/2] qede: make driver accept bigger rss tables

  We found some dpdk applications blindly pass fixed side rss hash tables,
and do not check driver/device capabilities.

Moreover, many other drivers do not do such a strong check as well.

So here we fix it, making qede accept any size rss_key. For larger key
tables we just crop it with notice trace message.

CC: stable@dpdk.org
Signed-off-by: Igor Russkikh <irusskikh@marvell.com>
---
 drivers/net/qede/qede_ethdev.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
  

On Sun, Feb 21, 2021 at 4:47 PM Igor Russkikh <irusskikh@marvell.com> wrote:
>
> We found some dpdk applications blindly pass fixed side rss hash tables,
> and do not check driver/device capabilities.
>
> Moreover, many other drivers do not do such a strong check as well.
>
> So here we fix it, making qede accept any size rss_key. For larger key
> tables we just crop it with notice trace message.
>
> CC: stable@dpdk.org
> Signed-off-by: Igor Russkikh <irusskikh@marvell.com>

HI @Rasesh Mody  @Shahed Shaikh

Could you review this series?


> ---
>  drivers/net/qede/qede_ethdev.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/net/qede/qede_ethdev.c b/drivers/net/qede/qede_ethdev.c
> index ab5f5b106..7363d98f2 100644
> --- a/drivers/net/qede/qede_ethdev.c
> +++ b/drivers/net/qede/qede_ethdev.c
> @@ -2139,8 +2139,8 @@ int qede_rss_hash_update(struct rte_eth_dev *eth_dev,
>                 /* RSS hash key */
>                 if (key) {
>                         if (len > (ECORE_RSS_KEY_SIZE * sizeof(uint32_t))) {
> -                               DP_ERR(edev, "RSS key length exceeds limit\n");
> -                               return -EINVAL;
> +                               len = ECORE_RSS_KEY_SIZE * sizeof(uint32_t);
> +                               DP_NOTICE(edev, false, "RSS key length exceeds limit\n");
>                         }
>                         DP_INFO(edev, "Applying user supplied hash key\n");
>                         rss_params.update_rss_key = 1;
> --
> 2.25.1
>
  

> -----Original Message-----
> From: Igor Russkikh <irusskikh@marvell.com>
> Sent: Sunday, February 21, 2021 4:47 PM
> To: dev@dpdk.org
> Cc: Rasesh Mody <rmody@marvell.com>; Devendra Singh Rawat
> <dsinghrawat@marvell.com>; Igor Russkikh <irusskikh@marvell.com>;
> stable@dpdk.org
> Subject: [PATCH 2/2] qede: make driver accept bigger rss tables
> 
> We found some dpdk applications blindly pass fixed side rss hash tables, and
> do not check driver/device capabilities.
> 
> Moreover, many other drivers do not do such a strong check as well.
> 
> So here we fix it, making qede accept any size rss_key. For larger key tables we
> just crop it with notice trace message.
> 
> CC: stable@dpdk.org
> Signed-off-by: Igor Russkikh <irusskikh@marvell.com>
> ---
>  drivers/net/qede/qede_ethdev.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/net/qede/qede_ethdev.c b/drivers/net/qede/qede_ethdev.c
> index ab5f5b106..7363d98f2 100644
> --- a/drivers/net/qede/qede_ethdev.c
> +++ b/drivers/net/qede/qede_ethdev.c
> @@ -2139,8 +2139,8 @@ int qede_rss_hash_update(struct rte_eth_dev
> *eth_dev,
>  		/* RSS hash key */
>  		if (key) {
>  			if (len > (ECORE_RSS_KEY_SIZE * sizeof(uint32_t))) {
> -				DP_ERR(edev, "RSS key length exceeds
> limit\n");
> -				return -EINVAL;
> +				len = ECORE_RSS_KEY_SIZE * sizeof(uint32_t);
> +				DP_NOTICE(edev, false, "RSS key length
> exceeds limit\n");

IMO, it will be better if the log message also states that RSS key is trimmed to 'len' size.

Thanks,
Devendra
  

> IMO, it will be better if the log message also states that RSS key is trimmed to 'len' size.

Resent v2, thanks.

Devendra, please take these two patches into our internal codebase as well.

Igor
  

Sure Igor, I will do that.

Thanks,
Devendra

> -----Original Message-----
> From: Igor Russkikh <irusskikh@marvell.com>
> Sent: Friday, March 19, 2021 3:18 PM
> To: Devendra Singh Rawat <dsinghrawat@marvell.com>; dev@dpdk.org
> Cc: Rasesh Mody <rmody@marvell.com>; stable@dpdk.org
> Subject: RE: [PATCH 2/2] qede: make driver accept bigger rss tables
> 
> 
> > IMO, it will be better if the log message also states that RSS key is trimmed to
> 'len' size.
> 
> Resent v2, thanks.
> 
> Devendra, please take these two patches into our internal codebase as well.
> 
> Igor