linux-kernel - Re: [PATCH net v3] virtio_net: Do not send RSS key if it is not supported

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Date: Wed, 3 Apr 2024 05:53:12 -0700
From: Breno Leitao <leitao@...ian.org>
To: "Michael S. Tsirkin" <mst@...hat.com>
Cc: hengqi@...ux.alibaba.com, xuanzhuo@...ux.alibaba.com,
	Jason Wang <jasowang@...hat.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Andrew Melnychenko <andrew@...nix.com>, rbc@...a.com,
	riel@...riel.com, stable@...r.kernel.org, qemu-devel@...gnu.org,
	"open list:VIRTIO CORE AND NET DRIVERS" <virtualization@...ts.linux.dev>,
	"open list:NETWORKING DRIVERS" <netdev@...r.kernel.org>,
	open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net v3] virtio_net: Do not send RSS key if it is not
 supported

On Sun, Mar 31, 2024 at 04:20:30PM -0400, Michael S. Tsirkin wrote:
> On Fri, Mar 29, 2024 at 10:16:41AM -0700, Breno Leitao wrote:
> > @@ -3814,13 +3815,24 @@ static int virtnet_set_rxfh(struct net_device *dev,
> >  		return -EOPNOTSUPP;
> >  
> >  	if (rxfh->indir) {
> > +		if (!vi->has_rss)
> > +			return -EOPNOTSUPP;
> > +
> >  		for (i = 0; i < vi->rss_indir_table_size; ++i)
> >  			vi->ctrl->rss.indirection_table[i] = rxfh->indir[i];
> > +		update = true;
> >  	}
> > -	if (rxfh->key)
> > +
> > +	if (rxfh->key) {
> > +		if (!vi->has_rss && !vi->has_rss_hash_report)
> > +			return -EOPNOTSUPP;
> 
> 
> What's the logic here? Is it || or &&? A comment can't hurt.

If txfh carries a key, then the device needs to has either has_rss or
has_rss_hash_report "features".

These are basically virtio features VIRTIO_NET_F_HASH_REPORT and
VIRTIO_NET_F_RSS that are set at virtio_probe.

I will add the comment and respin the series.