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Subject[RFC net-next 12/13] netdevsim: Handle SWITCHDEV_PORT_ATTR_GET event
Date
Following patches will change the way we communicate getting or setting
a port's attribute and use a blocking notifier to perform those tasks.

Prepare netdevsim to support receiving notifier events targeting
SWITCHDEV_PORT_ATTR_GET and simply translate that into the existing
switchdev_ops::switchdev_port_attr_get operation.

We register a single blocking switchdev notifier for the entire driver
instance.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
---
drivers/net/netdevsim/netdev.c | 43 +++++++++++++++++++++++++++++++++-
1 file changed, 42 insertions(+), 1 deletion(-)

diff --git a/drivers/net/netdevsim/netdev.c b/drivers/net/netdevsim/netdev.c
index 8d8e2b3f263e..817d94cec90f 100644
--- a/drivers/net/netdevsim/netdev.c
+++ b/drivers/net/netdevsim/netdev.c
@@ -168,6 +168,20 @@ static const struct switchdev_ops nsim_switchdev_ops = {
.switchdev_port_attr_get = nsim_port_attr_get,
};

+static int nsim_switchdev_port_attr_event(unsigned long event,
+ struct net_device *dev,
+ struct switchdev_notifier_port_attr_info *port_attr_info)
+{
+ int rc;
+
+ if (event != SWITCHDEV_PORT_ATTR_GET)
+ return NOTIFY_DONE;
+
+ rc = nsim_port_attr_get(dev, port_attr_info->attr);
+ port_attr_info->handled = true;
+ return notifier_from_errno(rc);
+}
+
static int nsim_init(struct net_device *dev)
{
char sdev_ddir_name[10], sdev_link_name[32];
@@ -495,6 +509,26 @@ static const struct net_device_ops nsim_netdev_ops = {
.ndo_bpf = nsim_bpf,
};

+static int nsim_swdev_blocking_event(struct notifier_block *nb,
+ unsigned long event, void *ptr)
+{
+ struct net_device *dev = switchdev_notifier_info_to_dev(ptr);
+
+ if (dev->netdev_ops != &nsim_netdev_ops)
+ return NOTIFY_DONE;
+
+ switch (event) {
+ case SWITCHDEV_PORT_ATTR_GET:
+ return nsim_switchdev_port_attr_event(event, dev, ptr);
+ }
+
+ return NOTIFY_DONE;
+}
+
+static struct notifier_block nsim_swdev_blocking_nb = {
+ .notifier_call = nsim_swdev_blocking_event,
+};
+
static void nsim_setup(struct net_device *dev)
{
ether_setup(dev);
@@ -583,10 +617,14 @@ static int __init nsim_module_init(void)
goto err_debugfs_destroy;
}

- err = bus_register(&nsim_bus);
+ err = register_switchdev_blocking_notifier(&nsim_swdev_blocking_nb);
if (err)
goto err_sdir_destroy;

+ err = bus_register(&nsim_bus);
+ if (err)
+ goto err_unreg_notifier;
+
err = nsim_devlink_init();
if (err)
goto err_unreg_bus;
@@ -601,6 +639,8 @@ static int __init nsim_module_init(void)
nsim_devlink_exit();
err_unreg_bus:
bus_unregister(&nsim_bus);
+err_unreg_notifier:
+ unregister_switchdev_blocking_notifier(&nsim_swdev_blocking_nb);
err_sdir_destroy:
debugfs_remove_recursive(nsim_sdev_ddir);
err_debugfs_destroy:
@@ -613,6 +653,7 @@ static void __exit nsim_module_exit(void)
rtnl_link_unregister(&nsim_link_ops);
nsim_devlink_exit();
bus_unregister(&nsim_bus);
+ unregister_switchdev_blocking_notifier(&nsim_swdev_blocking_nb);
debugfs_remove_recursive(nsim_sdev_ddir);
debugfs_remove_recursive(nsim_ddir);
}
--
2.17.1
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