netdev - Re: [PATCH net-next 02/18] switchdev: flesh out get/set attr ops

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Date:	Tue, 31 Mar 2015 09:05:44 -0700
From:	Scott Feldman <sfeldma@...il.com>
To:	Roopa Prabhu <roopa@...ulusnetworks.com>
Cc:	"Arad, Ronen" <ronen.arad@...el.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"jiri@...nulli.us" <jiri@...nulli.us>,
	"linux@...ck-us.net" <linux@...ck-us.net>,
	"f.fainelli@...il.com" <f.fainelli@...il.com>
Subject: Re: [PATCH net-next 02/18] switchdev: flesh out get/set attr ops

On Tue, Mar 31, 2015 at 8:30 AM, Roopa Prabhu <roopa@...ulusnetworks.com> wrote:
>
>
> On Monday, March 30, 2015, Scott Feldman <sfeldma@...il.com> wrote:
>>
>> On Mon, Mar 30, 2015 at 5:22 PM, Arad, Ronen <ronen.arad@...el.com> wrote:
>> >
>> >
>> >>-----Original Message-----
>> >>From: netdev-owner@...r.kernel.org [mailto:netdev-owner@...r.kernel.org]
>> >> On
>> >>Behalf Of sfeldma@...il.com
>> >>Sent: Monday, March 30, 2015 1:40 AM
>> >>To: netdev@...r.kernel.org
>> >>Cc: jiri@...nulli.us; roopa@...ulusnetworks.com; linux@...ck-us.net;
>> >>f.fainelli@...il.com
>> >>Subject: [PATCH net-next 02/18] switchdev: flesh out get/set attr ops
>> >>
>> >>From: Scott Feldman <sfeldma@...il.com>
>> >>
>> > [cut]
>> >>
>> >> int swdev_port_attr_set(struct net_device *dev, struct swdev_attr
>> >> *attr)
>> >> {
>> >>-      return -EOPNOTSUPP;
>> >>+      struct swdev_attr prev = *attr;
>> >>+      int err, get_err;
>> >>+
>> >>+      get_err = swdev_port_attr_get(dev, &prev);
>> >>+
>> >>+      err = _swdev_port_attr_set(dev, attr);
>> >>+      if (err && !get_err && !(attr->flags & SWDEV_ATTR_F_NO_RECOVER))
>> >>+              /* Some err on set: revert to previous value */
>> >>+              _swdev_port_attr_set(dev, &prev);
>> >
>> > Netlink requests could contain multiple attributes within a single
>> > request.
>> > Reverting to the previous value applies only to the first
>> > swdev_port_attr_set error. It does not rollback all prior changes that
>> > were triggered by the same Netlink request.
>>
>> Since attr_set scope is a single attr across ports, it can only revert
>> that attr for those ports.  So rewinding multiple attributes needs to
>> happen above attr_set.  I guess we could have a multi_attr_set that
>> takes an array of *attrs, but something like this can be built on top
>> of attr_set.  Maybe baby steps is best first so we can see how things
>> shape up.
>
>
>  Having a multi attr set/del is necessary in some cases where the hw api may
> be able to handle more than one attr set/del. I can see this especially for
> vlans. So, it would be nice if the driver can get all attributes and do the
> necessary optimizations to program hardware.

Yup, agreed, I'm adding that for vlans for v2 so it honors the vlan
range work you recently added and the driver gets one call to install
a range-worths of vlans.
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