netdev - RE: [net-next v5 07/15] net/mlx5: SF, Add auxiliary device support

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Date:   Wed, 16 Dec 2020 05:19:15 +0000
From:   Parav Pandit <parav@...dia.com>
To:     Jakub Kicinski <kuba@...nel.org>, Saeed Mahameed <saeed@...nel.org>
CC:     "David S. Miller" <davem@...emloft.net>,
        Jason Gunthorpe <jgg@...dia.com>,
        Leon Romanovsky <leonro@...dia.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
        David Ahern <dsahern@...nel.org>,
        Jacob Keller <jacob.e.keller@...el.com>,
        Sridhar Samudrala <sridhar.samudrala@...el.com>,
        "david.m.ertman@...el.com" <david.m.ertman@...el.com>,
        "dan.j.williams@...el.com" <dan.j.williams@...el.com>,
        "kiran.patil@...el.com" <kiran.patil@...el.com>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        Vu Pham <vuhuong@...dia.com>,
        Saeed Mahameed <saeedm@...dia.com>
Subject: RE: [net-next v5 07/15] net/mlx5: SF, Add auxiliary device support



> From: Jakub Kicinski <kuba@...nel.org>
> Sent: Wednesday, December 16, 2020 6:14 AM
> 
> On Tue, 15 Dec 2020 01:03:50 -0800 Saeed Mahameed wrote:
> > +static ssize_t sfnum_show(struct device *dev, struct device_attribute
> > +*attr, char *buf) {
> > +	struct auxiliary_device *adev = container_of(dev, struct
> auxiliary_device, dev);
> > +	struct mlx5_sf_dev *sf_dev = container_of(adev, struct mlx5_sf_dev,
> > +adev);
> > +
> > +	return scnprintf(buf, PAGE_SIZE, "%u\n", sf_dev->sfnum); } static
> > +DEVICE_ATTR_RO(sfnum);
> > +
> > +static struct attribute *sf_device_attrs[] = {
> > +	&dev_attr_sfnum.attr,
> > +	NULL,
> > +};
> > +
> > +static const struct attribute_group sf_attr_group = {
> > +	.attrs = sf_device_attrs,
> > +};
> > +
> > +static const struct attribute_group *sf_attr_groups[2] = {
> > +	&sf_attr_group,
> > +	NULL
> > +};
> 
> Why the sysfs attribute? Devlink should be able to report device name so
> there's no need for a tie in from the other end.
There isn't a need to enforce a devlink instance creation either, those mlx5 driver does it.
systemd/udev looks after the sysfs attributes, so its parent device, similar to how phys_port_name etc looked for representor side.