netdev - Re: [PATCH V3 net-next 1/2] liquidio: switchdev support for LiquidIO NIC

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Date:   Wed, 1 Nov 2017 13:14:06 -0700
From:   Jakub Kicinski <kubakici@...pl>
To:     Felix Manlunas <felix.manlunas@...ium.com>,
        Andrew Lunn <andrew@...n.ch>
Cc:     davem@...emloft.net, netdev@...r.kernel.org,
        raghu.vatsavayi@...ium.com, derek.chickles@...ium.com,
        satananda.burla@...ium.com, vijaya.guvva@...ium.com,
        Or Gerlitz <gerlitz.or@...il.com>, michael.chan@...adcom.com,
        Saeed Mahameed <saeedm@...lanox.com>
Subject: Re: [PATCH V3 net-next 1/2] liquidio: switchdev support for
 LiquidIO NIC

On Wed, 1 Nov 2017 12:29:48 -0700, Felix Manlunas wrote:
> > > +lio_vf_rep_phys_port_name(struct net_device *dev,
> > > +			  char *buf, size_t len)
> > > +{
> > > +	struct lio_vf_rep_desc *vf_rep = netdev_priv(dev);
> > > +	struct octeon_device *oct = vf_rep->oct;
> > > +	int ret;
> > > +
> > > +	ret = snprintf(buf, len, "pf%dvf%d", oct->pf_num,
> > > +		       vf_rep->ifidx - oct->pf_num * 64 - 1);
> > > +	if (ret >= len)
> > > +		return -EOPNOTSUPP;  
> > 
> > EOPNOTSUPP seems an odd return code for too short a buffer?  
> 
> We will replace that with ENOBUFS in a future patch.

Strangely enough mlx5 and bnxt also use EOPNOTSUPP if string doesn't
fit.  Others use EINVAL, IMHO that's more appropriate.