netdev - Re: [PATCH net 1/2] ixgbe: Allow flow hash to be set via ethtool

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Date:   Sun, 16 Apr 2023 09:46:19 -0500
From:   "Samudrala, Sridhar" <sridhar.samudrala@...el.com>
To:     Joe Damato <jdamato@...tly.com>, <intel-wired-lan@...ts.osuosl.org>
CC:     <netdev@...r.kernel.org>, <jesse.brandeburg@...el.com>,
        <anthony.l.nguyen@...el.com>, <kuba@...nel.org>
Subject: Re: [PATCH net 1/2] ixgbe: Allow flow hash to be set via ethtool



On 4/15/2023 12:48 AM, Joe Damato wrote:
> ixgbe currently returns `EINVAL` whenever the flowhash it set by ethtool
> because the ethtool code in the kernel passes a non-zero value for hfunc
> that ixgbe should allow.
> 
> When ethtool is called with `ETHTOOL_SRXFHINDIR`,
> `ethtool_set_rxfh_indir` will call ixgbe's set_rxfh function
> with `ETH_RSS_HASH_NO_CHANGE`. This value should be accepted.
> 
> When ethtool is called with `ETHTOOL_SRSSH`, `ethtool_set_rxfh` will
> call ixgbe's set_rxfh function with `rxfh.hfunc`, which appears to be
> hardcoded in ixgbe to always be `ETH_RSS_HASH_TOP`. This value should
> also be accepted.
> 
> Before this patch:
> 
> $ sudo ethtool -L eth1 combined 10
> $ sudo ethtool -X eth1 default
> Cannot set RX flow hash configuration: Invalid argument
> 
> After this patch:
> 
> $ sudo ethtool -L eth1 combined 10
> $ sudo ethtool -X eth1 default
> $ sudo ethtool -x eth1
> RX flow hash indirection table for eth1 with 10 RX ring(s):
>      0:      0     1     2     3     4     5     6     7
>      8:      8     9     0     1     2     3     4     5
>     16:      6     7     8     9     0     1     2     3
>     24:      4     5     6     7     8     9     0     1
>     ...
> 
> Signed-off-by: Joe Damato <jdamato@...tly.com>

Reviewed-by: Sridhar Samudrala <sridhar.samudrala@...el.com>

> ---
>   drivers/net/ethernet/intel/ixgbe/ixgbe_ethtool.c | 4 ++--
>   1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_ethtool.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_ethtool.c
> index 6cfc9dc16537..821dfd323fa9 100644
> --- a/drivers/net/ethernet/intel/ixgbe/ixgbe_ethtool.c
> +++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_ethtool.c
> @@ -3131,8 +3131,8 @@ static int ixgbe_set_rxfh(struct net_device *netdev, const u32 *indir,
>   	int i;
>   	u32 reta_entries = ixgbe_rss_indir_tbl_entries(adapter);
>   
> -	if (hfunc)
> -		return -EINVAL;
> +	if (hfunc != ETH_RSS_HASH_NO_CHANGE && hfunc != ETH_RSS_HASH_TOP)
> +		return -EOPNOTSUPP;
>   
>   	/* Fill out the redirection table */
>   	if (indir) {