netdev - Re: [PATCH net-next V2 1/2] ethtool: Support for configurable RSS hash function

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Message-ID: <547DD74C.9070603@solarflare.com>
Date:	Tue, 2 Dec 2014 15:14:20 +0000
From:	Edward Cree <ecree@...arflare.com>
To:	Amir Vadai <amirv@...lanox.com>
CC:	"David S. Miller" <davem@...emloft.net>,
	Ben Hutchings <ben@...adent.org.uk>,
	netdev <netdev@...r.kernel.org>,
	"Solarflare linux maintainers" <linux-net-drivers@...arflare.com>,
	Shradha Shah <sshah@...arflare.com>
Subject: Re: [PATCH net-next V2 1/2] ethtool: Support for configurable RSS
 hash function

On 02/12/14 14:20, Amir Vadai wrote:
> diff --git a/drivers/net/ethernet/sfc/ethtool.c b/drivers/net/ethernet/sfc/ethtool.c
> index cad258a..2ac07c9 100644
> --- a/drivers/net/ethernet/sfc/ethtool.c
> +++ b/drivers/net/ethernet/sfc/ethtool.c
> @@ -1086,19 +1086,29 @@ static u32 efx_ethtool_get_rxfh_indir_size(struct net_device *net_dev)
>  		0 : ARRAY_SIZE(efx->rx_indir_table));
>  }
>  
> -static int efx_ethtool_get_rxfh(struct net_device *net_dev, u32 *indir, u8 *key)
> +static int efx_ethtool_get_rxfh(struct net_device *net_dev, u32 *indir, u8 *key,
> +				u8 *hfunc)
>  {
>  	struct efx_nic *efx = netdev_priv(net_dev);
>  
> -	memcpy(indir, efx->rx_indir_table, sizeof(efx->rx_indir_table));
> +	if (hfunc)
> +		*hfunc = ETH_RSS_HASH_UNKNOWN;
This should be ETH_RSS_HASH_TOP, especially as that's what you test
against in the _set_ function below.
(I don't know if we responded to your query.  If not, I can confirm
we're using Toeplitz.)
> +	if (indir)
> +		memcpy(indir, efx->rx_indir_table, sizeof(efx->rx_indir_table));
>  	return 0;
>  }
>  
> -static int efx_ethtool_set_rxfh(struct net_device *net_dev,
> -				const u32 *indir, const u8 *key)
> +static int efx_ethtool_set_rxfh(struct net_device *net_dev, const u32 *indir,
> +				const u8 *key, const u8 hfunc)
>  {
>  	struct efx_nic *efx = netdev_priv(net_dev);
>  
> +	/* We do not allow change in unsupported parameters */
> +	if (key ||
> +	    (hfunc != ETH_RSS_HASH_NO_CHANGE && hfunc != ETH_RSS_HASH_TOP))
> +		return -EOPNOTSUPP;
> +	if (!indir)
> +		return 0;
>  	memcpy(efx->rx_indir_table, indir, sizeof(efx->rx_indir_table));
>  	efx->type->rx_push_rss_config(efx);
>  	return 0;
-Edward
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