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

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Date:	Tue, 31 Mar 2015 00:22:59 +0000
From:	"Arad, Ronen" <ronen.arad@...el.com>
To:	"sfeldma@...il.com" <sfeldma@...il.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
CC:	"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



>-----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.

>+
>+	return err;
> }
> EXPORT_SYMBOL_GPL(swdev_port_attr_set);
>
>--
>1.7.10.4
>
>--
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