netdev - Re: [PATCH rdma-next v1 04/12] IB/opa-vnic: Virtual Network Interface Controller (VNIC) netdev

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Message-ID: <20170412192131.GB1343@mtr-leonro.local>
Date:   Wed, 12 Apr 2017 22:21:31 +0300
From:   Leon Romanovsky <leon@...nel.org>
To:     "Vishwanathapura, Niranjana" <niranjana.vishwanathapura@...el.com>
Cc:     dledford@...hat.com, linux-rdma@...r.kernel.org,
        netdev@...r.kernel.org, dennis.dalessandro@...el.com,
        ira.weiny@...el.com, Sadanand Warrier <sadanand.warrier@...el.com>,
        Sudeep Dutt <sudeep.dutt@...el.com>,
        Andrzej Kacprowski <andrzej.kacprowski@...el.com>
Subject: Re: [PATCH rdma-next v1 04/12] IB/opa-vnic: Virtual Network
 Interface Controller (VNIC) netdev

On Wed, Apr 12, 2017 at 11:31:37AM -0700, Vishwanathapura, Niranjana wrote:
> On Wed, Apr 12, 2017 at 10:08:30AM +0300, Leon Romanovsky wrote:
> > > +#define v_dbg(format, arg...) \
> > > +	netdev_dbg(adapter->netdev, format, ## arg)
> > > +#define v_err(format, arg...) \
> > > +	netdev_err(adapter->netdev, format, ## arg)
> > > +#define v_info(format, arg...) \
> > > +	netdev_info(adapter->netdev, format, ## arg)
> > > +#define v_warn(format, arg...) \
> > > +	netdev_warn(adapter->netdev, format, ## arg)
> > > +
> >
> > IMHO, these wrappers are redundant.
> >
>
> Using same constructs as some Intel standard ethernet drivers.

I'll leave this decision to Doug. IMHO open coded variant is preferable.

>
> > > +/* opa_netdev_open - activate network interface */
> > > +static int opa_netdev_open(struct net_device *netdev)
> > > +{
> > > +	struct opa_vnic_adapter *adapter = opa_vnic_priv(netdev);
> > > +	int rc;
> > > +
> > > +	rc = adapter->rn_ops->ndo_open(adapter->netdev);
> > > +	if (rc) {
> > > +		v_dbg("open failed %d\n", rc);
> > > +		return rc;
> > > +	}
> > > +
> > > +	v_info("opened\n");
> >
> > All these v_info are achieved by tracepoints (function tracer).
> >
>
> Some of these messages are useful for analysing reported logs.
> Let me change these opened/closed messges to debug level.

I agree with you regarding error messages, I disagree regarding
flow/info messages.

>
> > > +
> > > +	netdev = ibdev->alloc_rdma_netdev(ibdev, port_num,
> > > +					  RDMA_NETDEV_OPA_VNIC,
> > > +					  "veth%d", NET_NAME_UNKNOWN,
> > > +					  ether_setup);
> > > +	if (!netdev)
> > > +		return ERR_PTR(-ENOMEM);
> > > +	else if (IS_ERR(netdev))
> > > +		return ERR_CAST(netdev);
> > > +
> >
>
> > Erez and Jason came to this code for IPoIB, it is better to have same
> > error handling for all alloc_rdma_netdev callers.
> > +       if (hca->alloc_rdma_netdev) {
> > +               dev = hca->alloc_rdma_netdev(hca, port,
> > +                                            RDMA_NETDEV_IPOIB, name,
> > +                                            NET_NAME_UNKNOWN,
> > +                                            ipoib_setup_common);
> > +               if (IS_ERR_OR_NULL(dev) && PTR_ERR(dev) != -EOPNOTSUPP)
> > +                       return NULL;
> > +       }
> >
> >
>
> IPoIB handles EOPNOTSUPP differently (by assigning default operations).
> It is not applicable to OPA VNIC, hence it just returns the error code.
>
> I just noticed that IPoIB is using EOPNOTSUPP, however OPA VNIC is using
> ENOTSUPP. EOPNOTSUPP seesm to be widely used, so I will change OPA VNIC to
> use the same. Will also document this requirement in ib_verbs.h where this
> function is defined.

The ENOTSUPP is for NFS and it can't be returned to user space. The proper
error is EOPNOTSUPP.

Thanks

>
> Niranjana
>
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