[PATCH net-next v2 2/2] net: stmmac: Don't set or get RSS parameters when not supported

[Lorenzo Bianconi]

> The RSS kselftests fail on stmmac, and this is partly due to the driver
> reporting bogus data for the RSS ops :
> 
>  - ethtool -x reports an indirection table and a key while the hardware
>    doesn't have any of that
>  - ethtool -X fails with -EINVAL.
> 
> Let's return early in the rss ops if we know the hardware and platform
> don't support RSS.
> 
> Signed-off-by: Maxime Chevallier <maxime.chevallier at bootlin.com>

Acked-by: Lorenzo Bianconi <lorenzo.bianconi at oss.qualcomm.com>

> ---
>  drivers/net/ethernet/stmicro/stmmac/stmmac_ethtool.c | 12 ++++++++++++
>  1 file changed, 12 insertions(+)
> 
> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_ethtool.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_ethtool.c
> index 154cc0c7623d..b78dc301d70d 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_ethtool.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_ethtool.c
> @@ -927,6 +927,9 @@ static u32 stmmac_get_rxfh_key_size(struct net_device *dev)
>  {
>  	struct stmmac_priv *priv = netdev_priv(dev);
>  
> +	if (!stmmac_rss_is_supported(priv))
> +		return 0;
> +
>  	return sizeof(priv->rss.key);
>  }
>  
> @@ -934,6 +937,9 @@ static u32 stmmac_get_rxfh_indir_size(struct net_device *dev)
>  {
>  	struct stmmac_priv *priv = netdev_priv(dev);
>  
> +	if (!stmmac_rss_is_supported(priv))
> +		return 0;
> +
>  	return ARRAY_SIZE(priv->rss.table);
>  }
>  
> @@ -943,6 +949,9 @@ static int stmmac_get_rxfh(struct net_device *dev,
>  	struct stmmac_priv *priv = netdev_priv(dev);
>  	int i;
>  
> +	if (!stmmac_rss_is_supported(priv))
> +		return -EOPNOTSUPP;
> +
>  	if (rxfh->indir) {
>  		for (i = 0; i < ARRAY_SIZE(priv->rss.table); i++)
>  			rxfh->indir[i] = priv->rss.table[i];
> @@ -962,6 +971,9 @@ static int stmmac_set_rxfh(struct net_device *dev,
>  	struct stmmac_priv *priv = netdev_priv(dev);
>  	int i;
>  
> +	if (!stmmac_rss_is_supported(priv))
> +		return -EOPNOTSUPP;
> +
>  	if (rxfh->hfunc != ETH_RSS_HASH_NO_CHANGE &&
>  	    rxfh->hfunc != ETH_RSS_HASH_TOP)
>  		return -EOPNOTSUPP;
> -- 
> 2.55.0
> 
> 
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