diff options
Diffstat (limited to 'net/switchdev')
-rw-r--r-- | net/switchdev/switchdev.c | 169 |
1 files changed, 169 insertions, 0 deletions
diff --git a/net/switchdev/switchdev.c b/net/switchdev/switchdev.c index b7f44a23def5..8f47187dc185 100644 --- a/net/switchdev/switchdev.c +++ b/net/switchdev/switchdev.c @@ -37,6 +37,175 @@ int switchdev_parent_id_get(struct net_device *dev, EXPORT_SYMBOL_GPL(switchdev_parent_id_get); /** + * switchdev_port_attr_get - Get port attribute + * + * @dev: port device + * @attr: attribute to get + */ +int switchdev_port_attr_get(struct net_device *dev, struct switchdev_attr *attr) +{ + const struct switchdev_ops *ops = dev->switchdev_ops; + struct net_device *lower_dev; + struct list_head *iter; + struct switchdev_attr first = { + .id = SWITCHDEV_ATTR_UNDEFINED + }; + int err = -EOPNOTSUPP; + + if (ops && ops->switchdev_port_attr_get) + return ops->switchdev_port_attr_get(dev, attr); + + if (attr->flags & SWITCHDEV_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 = switchdev_port_attr_get(lower_dev, attr); + if (err) + break; + if (first.id == SWITCHDEV_ATTR_UNDEFINED) + first = *attr; + else if (memcmp(&first, attr, sizeof(*attr))) + return -ENODATA; + } + + return err; +} +EXPORT_SYMBOL_GPL(switchdev_port_attr_get); + +static int __switchdev_port_attr_set(struct net_device *dev, + struct switchdev_attr *attr) +{ + const struct switchdev_ops *ops = dev->switchdev_ops; + struct net_device *lower_dev; + struct list_head *iter; + int err = -EOPNOTSUPP; + + if (ops && ops->switchdev_port_attr_set) + return ops->switchdev_port_attr_set(dev, attr); + + if (attr->flags & SWITCHDEV_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 = __switchdev_port_attr_set(lower_dev, attr); + if (err) + break; + } + + return err; +} + +struct switchdev_attr_set_work { + struct work_struct work; + struct net_device *dev; + struct switchdev_attr attr; +}; + +static void switchdev_port_attr_set_work(struct work_struct *work) +{ + struct switchdev_attr_set_work *asw = + container_of(work, struct switchdev_attr_set_work, work); + int err; + + rtnl_lock(); + err = switchdev_port_attr_set(asw->dev, &asw->attr); + BUG_ON(err); + rtnl_unlock(); + + dev_put(asw->dev); + kfree(work); +} + +static int switchdev_port_attr_set_defer(struct net_device *dev, + struct switchdev_attr *attr) +{ + struct switchdev_attr_set_work *asw; + + asw = kmalloc(sizeof(*asw), GFP_ATOMIC); + if (!asw) + return -ENOMEM; + + INIT_WORK(&asw->work, switchdev_port_attr_set_work); + + dev_hold(dev); + asw->dev = dev; + memcpy(&asw->attr, attr, sizeof(asw->attr)); + + schedule_work(&asw->work); + + return 0; +} + +/** + * switchdev_port_attr_set - Set port attribute + * + * @dev: port device + * @attr: attribute to set + * + * Use a 2-phase prepare-commit transaction model to ensure + * system is not left in a partially updated state due to + * failure from driver/device. + */ +int switchdev_port_attr_set(struct net_device *dev, struct switchdev_attr *attr) +{ + int err; + + if (!rtnl_is_locked()) { + /* Running prepare-commit transaction across stacked + * devices requires nothing moves, so if rtnl_lock is + * not held, schedule a worker thread to hold rtnl_lock + * while setting attr. + */ + + return switchdev_port_attr_set_defer(dev, attr); + } + + /* Phase I: prepare for attr set. Driver/device should fail + * here if there are going to be issues in the commit phase, + * such as lack of resources or support. The driver/device + * should reserve resources needed for the commit phase here, + * but should not commit the attr. + */ + + attr->trans = SWITCHDEV_TRANS_PREPARE; + err = __switchdev_port_attr_set(dev, attr); + if (err) { + /* Prepare phase failed: abort the transaction. Any + * resources reserved in the prepare phase are + * released. + */ + + attr->trans = SWITCHDEV_TRANS_ABORT; + __switchdev_port_attr_set(dev, attr); + + return err; + } + + /* Phase II: commit attr set. This cannot fail as a fault + * of driver/device. If it does, it's a bug in the driver/device + * because the driver said everythings was OK in phase I. + */ + + attr->trans = SWITCHDEV_TRANS_COMMIT; + err = __switchdev_port_attr_set(dev, attr); + BUG_ON(err); + + return err; +} +EXPORT_SYMBOL_GPL(switchdev_port_attr_set); + +/** * switchdev_port_stp_update - Notify switch device port of STP * state change * @dev: port device |