netdev - Re: [PATCHv3 net-next] octeontx2-pf: Add RSS multi group support

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Date:   Wed, 09 Dec 2020 11:08:24 -0800
From:   Saeed Mahameed <saeed@...nel.org>
To:     Geetha sowjanya <gakula@...vell.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     sgoutham@...vell.com, davem@...emloft.net, kuba@...nel.org,
        sbhatta@...vell.com
Subject: Re: [PATCHv3 net-next] octeontx2-pf: Add RSS multi group support

On Wed, 2020-12-09 at 22:39 +0530, Geetha sowjanya wrote:
> Hardware supports 8 RSS groups per interface. Currently we are using
> only group '0'. This patch allows user to create new RSS
> groups/contexts
> and use the same as destination for flow steering rules.
> 
> usage:
> To steer the traffic to RQ 2,3
> 
> ethtool -X eth0 weight 0 0 1 1 context new
> (It will print the allocated context id number)
> New RSS context is 1
> 
> ethtool -N eth0 flow-type tcp4 dst-port 80 context 1 loc 1
> 
> To delete the context
> ethtool -X eth0 context 1 delete
> 
> When an RSS context is removed, the active classification
> rules using this context are also removed.
> 
> Change-log:
> v2
> - Removed unrelated whitespace
> - Coverted otx2_get_rxfh() to use new function.
> 
> v3
> - Coverted otx2_set_rxfh() to use new function.
> 
> Signed-off-by: Sunil Kovvuri Goutham <sgoutham@...vell.com>
> Signed-off-by: Geetha sowjanya <gakula@...vell.com>
> ---

...

> -/* Configure RSS table and hash key */
> -static int otx2_set_rxfh(struct net_device *dev, const u32 *indir,
> -			 const u8 *hkey, const u8 hfunc)
> +static int otx2_get_rxfh_context(struct net_device *dev, u32 *indir,
> +				 u8 *hkey, u8 *hfunc, u32 rss_context)
>  {
>  	struct otx2_nic *pfvf = netdev_priv(dev);
> +	struct otx2_rss_ctx *rss_ctx;
>  	struct otx2_rss_info *rss;
>  	int idx;
>  
> -	if (hfunc != ETH_RSS_HASH_NO_CHANGE && hfunc !=
> ETH_RSS_HASH_TOP)
> -		return -EOPNOTSUPP;
> -
>  	rss = &pfvf->hw.rss_info;
>  
>  	if (!rss->enable) {
> -		netdev_err(dev, "RSS is disabled, cannot change
> settings\n");
> +		netdev_err(dev, "RSS is disabled\n");
>  		return -EIO;
>  	}

I see that you init/enable rss on open, is this is your way to block
getting rss info if device is not open ? why do you need to report an
error anyway, why not just report whatever default config you will be
setting up on next open ? 

to me reporting errors to ethtool queries when device is down is a bad
user experience.

> +	if (rss_context >= MAX_RSS_GROUPS)
> +		return -EINVAL;
> +

-ENOENT
> +	rss_ctx = rss->rss_ctx[rss_context];
> +	if (!rss_ctx)
> +		return -EINVAL;
> 

-ENOENT