This is a note to let you know that I've just added the patch titled
net: devlink: track netdev with devlink_port assigned
to the 6.1-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
net-devlink-track-netdev-with-devlink_port-assigned.patch
and it can be found in the queue-6.1 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 71fe4bb7e1513846e9be4229e11c805d991d4768
Author: Jiri Pirko <jiri@xxxxxxxxxxx>
Date: Wed Nov 2 17:02:03 2022 +0100
net: devlink: track netdev with devlink_port assigned
[ Upstream commit 02a68a47eadedf95748facfca6ced31fb0181d52 ]
Currently, ethernet drivers are using devlink_port_type_eth_set() and
devlink_port_type_clear() to set devlink port type and link to related
netdev.
Instead of calling them directly, let the driver use
SET_NETDEV_DEVLINK_PORT macro to assign devlink_port pointer and let
devlink to track it. Note the devlink port pointer is static during
the time netdevice is registered.
In devlink code, use per-namespace netdev notifier to track
the netdevices with devlink_port assigned and change the internal
devlink_port type and related type pointer accordingly.
Signed-off-by: Jiri Pirko <jiri@xxxxxxxxxx>
Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx>
Stable-dep-of: fef5b228dd38 ("rtnetlink: move IFLA_GSO_ tb check to validate_linkmsg")
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index eac51e22a52a8..1f8e1cff035da 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -2008,6 +2008,11 @@ enum netdev_ml_priv_type {
* registered
* @offload_xstats_l3: L3 HW stats for this netdevice.
*
+ * @devlink_port: Pointer to related devlink port structure.
+ * Assigned by a driver before netdev registration using
+ * SET_NETDEV_DEVLINK_PORT macro. This pointer is static
+ * during the time netdevice is registered.
+ *
* FIXME: cleanup struct net_device such that network protocol info
* moves out.
*/
@@ -2358,9 +2363,22 @@ struct net_device {
netdevice_tracker watchdog_dev_tracker;
netdevice_tracker dev_registered_tracker;
struct rtnl_hw_stats64 *offload_xstats_l3;
+
+ struct devlink_port *devlink_port;
};
#define to_net_dev(d) container_of(d, struct net_device, dev)
+/*
+ * Driver should use this to assign devlink port instance to a netdevice
+ * before it registers the netdevice. Therefore devlink_port is static
+ * during the netdev lifetime after it is registered.
+ */
+#define SET_NETDEV_DEVLINK_PORT(dev, port) \
+({ \
+ WARN_ON((dev)->reg_state != NETREG_UNINITIALIZED); \
+ ((dev)->devlink_port = (port)); \
+})
+
static inline bool netif_elide_gro(const struct net_device *dev)
{
if (!(dev->features & NETIF_F_GRO) || dev->xdp_prog)
@@ -2795,6 +2813,7 @@ enum netdev_cmd {
NETDEV_PRE_TYPE_CHANGE,
NETDEV_POST_TYPE_CHANGE,
NETDEV_POST_INIT,
+ NETDEV_PRE_UNINIT,
NETDEV_RELEASE,
NETDEV_NOTIFY_PEERS,
NETDEV_JOIN,
diff --git a/net/core/dev.c b/net/core/dev.c
index 93d430693ca0f..ba9a0c1a4c505 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -1621,10 +1621,10 @@ const char *netdev_cmd_to_name(enum netdev_cmd cmd)
N(UP) N(DOWN) N(REBOOT) N(CHANGE) N(REGISTER) N(UNREGISTER)
N(CHANGEMTU) N(CHANGEADDR) N(GOING_DOWN) N(CHANGENAME) N(FEAT_CHANGE)
N(BONDING_FAILOVER) N(PRE_UP) N(PRE_TYPE_CHANGE) N(POST_TYPE_CHANGE)
- N(POST_INIT) N(RELEASE) N(NOTIFY_PEERS) N(JOIN) N(CHANGEUPPER)
- N(RESEND_IGMP) N(PRECHANGEMTU) N(CHANGEINFODATA) N(BONDING_INFO)
- N(PRECHANGEUPPER) N(CHANGELOWERSTATE) N(UDP_TUNNEL_PUSH_INFO)
- N(UDP_TUNNEL_DROP_INFO) N(CHANGE_TX_QUEUE_LEN)
+ N(POST_INIT) N(PRE_UNINIT) N(RELEASE) N(NOTIFY_PEERS) N(JOIN)
+ N(CHANGEUPPER) N(RESEND_IGMP) N(PRECHANGEMTU) N(CHANGEINFODATA)
+ N(BONDING_INFO) N(PRECHANGEUPPER) N(CHANGELOWERSTATE)
+ N(UDP_TUNNEL_PUSH_INFO) N(UDP_TUNNEL_DROP_INFO) N(CHANGE_TX_QUEUE_LEN)
N(CVLAN_FILTER_PUSH_INFO) N(CVLAN_FILTER_DROP_INFO)
N(SVLAN_FILTER_PUSH_INFO) N(SVLAN_FILTER_DROP_INFO)
N(PRE_CHANGEADDR) N(OFFLOAD_XSTATS_ENABLE) N(OFFLOAD_XSTATS_DISABLE)
@@ -10064,7 +10064,7 @@ int register_netdevice(struct net_device *dev)
dev->reg_state = ret ? NETREG_UNREGISTERED : NETREG_REGISTERED;
write_unlock(&dev_base_lock);
if (ret)
- goto err_uninit;
+ goto err_uninit_notify;
__netdev_update_features(dev);
@@ -10111,6 +10111,8 @@ int register_netdevice(struct net_device *dev)
out:
return ret;
+err_uninit_notify:
+ call_netdevice_notifiers(NETDEV_PRE_UNINIT, dev);
err_uninit:
if (dev->netdev_ops->ndo_uninit)
dev->netdev_ops->ndo_uninit(dev);
@@ -10857,6 +10859,8 @@ void unregister_netdevice_many(struct list_head *head)
netdev_name_node_alt_flush(dev);
netdev_name_node_free(dev->name_node);
+ call_netdevice_notifiers(NETDEV_PRE_UNINIT, dev);
+
if (dev->netdev_ops->ndo_uninit)
dev->netdev_ops->ndo_uninit(dev);
diff --git a/net/core/devlink.c b/net/core/devlink.c
index 79cfba316438c..4d167d3e84c62 100644
--- a/net/core/devlink.c
+++ b/net/core/devlink.c
@@ -71,6 +71,7 @@ struct devlink {
refcount_t refcount;
struct completion comp;
struct rcu_head rcu;
+ struct notifier_block netdevice_nb;
char priv[] __aligned(NETDEV_ALIGN);
};
@@ -9618,6 +9619,9 @@ void devlink_set_features(struct devlink *devlink, u64 features)
}
EXPORT_SYMBOL_GPL(devlink_set_features);
+static int devlink_netdevice_event(struct notifier_block *nb,
+ unsigned long event, void *ptr);
+
/**
* devlink_alloc_ns - Allocate new devlink instance resources
* in specific namespace
@@ -9648,10 +9652,13 @@ struct devlink *devlink_alloc_ns(const struct devlink_ops *ops,
ret = xa_alloc_cyclic(&devlinks, &devlink->index, devlink, xa_limit_31b,
&last_id, GFP_KERNEL);
- if (ret < 0) {
- kfree(devlink);
- return NULL;
- }
+ if (ret < 0)
+ goto err_xa_alloc;
+
+ devlink->netdevice_nb.notifier_call = devlink_netdevice_event;
+ ret = register_netdevice_notifier_net(net, &devlink->netdevice_nb);
+ if (ret)
+ goto err_register_netdevice_notifier;
devlink->dev = dev;
devlink->ops = ops;
@@ -9678,6 +9685,12 @@ struct devlink *devlink_alloc_ns(const struct devlink_ops *ops,
init_completion(&devlink->comp);
return devlink;
+
+err_register_netdevice_notifier:
+ xa_erase(&devlinks, devlink->index);
+err_xa_alloc:
+ kfree(devlink);
+ return NULL;
}
EXPORT_SYMBOL_GPL(devlink_alloc_ns);
@@ -9831,6 +9844,10 @@ void devlink_free(struct devlink *devlink)
WARN_ON(!list_empty(&devlink->port_list));
xa_destroy(&devlink->snapshot_ids);
+
+ unregister_netdevice_notifier_net(devlink_net(devlink),
+ &devlink->netdevice_nb);
+
xa_erase(&devlinks, devlink->index);
kfree(devlink);
@@ -10124,6 +10141,56 @@ void devlink_port_type_clear(struct devlink_port *devlink_port)
}
EXPORT_SYMBOL_GPL(devlink_port_type_clear);
+static int devlink_netdevice_event(struct notifier_block *nb,
+ unsigned long event, void *ptr)
+{
+ struct net_device *netdev = netdev_notifier_info_to_dev(ptr);
+ struct devlink_port *devlink_port = netdev->devlink_port;
+ struct devlink *devlink;
+
+ devlink = container_of(nb, struct devlink, netdevice_nb);
+
+ if (!devlink_port || devlink_port->devlink != devlink)
+ return NOTIFY_OK;
+
+ switch (event) {
+ case NETDEV_POST_INIT:
+ /* Set the type but not netdev pointer. It is going to be set
+ * later on by NETDEV_REGISTER event. Happens once during
+ * netdevice register
+ */
+ __devlink_port_type_set(devlink_port, DEVLINK_PORT_TYPE_ETH,
+ NULL, true);
+ break;
+ case NETDEV_REGISTER:
+ /* Set the netdev on top of previously set type. Note this
+ * event happens also during net namespace change so here
+ * we take into account netdev pointer appearing in this
+ * namespace.
+ */
+ __devlink_port_type_set(devlink_port, DEVLINK_PORT_TYPE_ETH,
+ netdev, true);
+ break;
+ case NETDEV_UNREGISTER:
+ /* Clear netdev pointer, but not the type. This event happens
+ * also during net namespace change so we need to clear
+ * pointer to netdev that is going to another net namespace.
+ */
+ __devlink_port_type_set(devlink_port, DEVLINK_PORT_TYPE_ETH,
+ NULL, true);
+ break;
+ case NETDEV_PRE_UNINIT:
+ /* Clear the type and the netdev pointer. Happens one during
+ * netdevice unregister.
+ */
+ __devlink_port_type_set(devlink_port, DEVLINK_PORT_TYPE_NOTSET,
+ NULL, true);
+ break;
+ }
+
+ return NOTIFY_OK;
+}
+
static int __devlink_port_attrs_set(struct devlink_port *devlink_port,
enum devlink_port_flavour flavour)
{
