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

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Date:	Mon, 30 Mar 2015 17:38:31 -0700
From:	Scott Feldman <sfeldma@...il.com>
To:	"Arad, Ronen" <ronen.arad@...el.com>
Cc:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"jiri@...nulli.us" <jiri@...nulli.us>,
	"roopa@...ulusnetworks.com" <roopa@...ulusnetworks.com>,
	"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 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.
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