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

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Date:	Mon, 30 Mar 2015 18:32:09 +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>
>
>Add the basic algorithms for get/set attr ops.  Use the same recusive algo to
>walk lower devs we've used for STP updates, for example.  For get, compare
>attr
>value for each lower dev and only return success if attr values match across
>all lower devs.  For sets, set the same attr value for all lower devs.  If
>something goes wrong on one of the lower devs, revert all back to previous
>attr
>value.
>
>If lower dev recusion isn't desired, allow a flag SWDEV_ATTR_F_NO_RECURSE to
>indicate get/set only work on port (lowest) device.
>
>On set, allow a flag SWDEV_ATTR_F_NO_RECOVER to turn off automatic err
>recovery.
>
>Signed-off-by: Scott Feldman <sfeldma@...il.com>
>---
> include/net/switchdev.h   |    4 +++
> net/switchdev/switchdev.c |   71 +++++++++++++++++++++++++++++++++++++++++++-
>-
> 2 files changed, 73 insertions(+), 2 deletions(-)
>
>diff --git a/include/net/switchdev.h b/include/net/switchdev.h
>index 7b72a4f..dcf0cb7 100644
>--- a/include/net/switchdev.h
>+++ b/include/net/switchdev.h
>@@ -18,8 +18,12 @@ enum swdev_attr_id {
> 	SWDEV_ATTR_UNDEFINED,
> };
>
>+#define SWDEV_ATTR_F_NO_RECURSE		BIT(0)
>+#define SWDEV_ATTR_F_NO_RECOVER		BIT(1)
>+
> struct swdev_attr {
> 	enum swdev_attr_id attr;
>+	u32 flags;
> };
>
> struct fib_info;
>diff --git a/net/switchdev/switchdev.c b/net/switchdev/switchdev.c
>index a894fa5..f3cac92 100644
>--- a/net/switchdev/switchdev.c
>+++ b/net/switchdev/switchdev.c
>@@ -44,10 +44,67 @@ EXPORT_SYMBOL_GPL(netdev_switch_parent_id_get);
>  */
> int swdev_port_attr_get(struct net_device *dev, struct swdev_attr *attr)
> {
>-	return -EOPNOTSUPP;
>+	const struct swdev_ops *ops = dev->swdev_ops;
>+	struct net_device *lower_dev;
>+	struct list_head *iter;
>+	struct swdev_attr first = {
>+		.attr = SWDEV_ATTR_UNDEFINED
>+	};
>+	int err = -EOPNOTSUPP;
>+
>+	if (ops && ops->swdev_port_attr_get)
>+		return ops->swdev_port_attr_get(dev, attr);
>+
>+	if (attr->flags & SWDEV_ATTR_F_NO_RECURSE)
>+		return err;
>+
>+	/* Switch device port(s) may be stacked under
>+	 * bond/team/vlan dev, so recurse down to get attr on
>+	 * each port.  Return -ENODATA if attr values don't
>+	 * compare across ports.
>+	 */
>+
>+	netdev_for_each_lower_dev(dev, lower_dev, iter) {
>+		err = swdev_port_attr_get(lower_dev, attr);
>+		if (err)
>+			break;
>+		if (first.attr == SWDEV_ATTR_UNDEFINED)
>+			first = *attr;
>+		else if (memcmp(&first, attr, sizeof(*attr)))
>+			return -ENODATA;
>+	}
>+
>+	return err;
> }
> EXPORT_SYMBOL_GPL(swdev_port_attr_get);
>
>+static int _swdev_port_attr_set(struct net_device *dev, struct swdev_attr
>*attr)
>+{
>+	const struct swdev_ops *ops = dev->swdev_ops;
>+	struct net_device *lower_dev;
>+	struct list_head *iter;
>+	int err = -EOPNOTSUPP;
>+
>+	if (ops && ops->swdev_port_attr_set)
>+		return ops->swdev_port_attr_set(dev, attr);
>+
>+	if (attr->flags & SWDEV_ATTR_F_NO_RECURSE)
>+		return err;
>+
>+	/* Switch device port(s) may be stacked under
>+	 * bond/team/vlan dev, so recurse down to set attr on
>+	 * each port.
>+	 */
>+
>+	netdev_for_each_lower_dev(dev, lower_dev, iter) {
>+		err = _swdev_port_attr_set(lower_dev, attr);
>+		if (err)
>+			break;
>+	}
>+
>+	return err;
>+}
>+
> /**
>  *	swdev_port_attr_set - Set port attribute
>  *
>@@ -56,7 +113,17 @@ EXPORT_SYMBOL_GPL(swdev_port_attr_get);
>  */
> 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);

Could revering to previous value fail?
Should such failure be logged?

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