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

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Message-ID: <547DD8F9.8030403@dev.mellanox.co.il>
Date:	Tue, 02 Dec 2014 17:21:29 +0200
From:	Eyal Perry <eyalpe@....mellanox.co.il>
To:	Edward Cree <ecree@...arflare.com>, 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 12/2/2014 17:14 PM, Edward Cree wrote:
> 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.)
Sending V3...
>> +	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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