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net: devlink: track netdev with devlink_port assigned

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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@nvidia.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Jiri Pirko 2022-11-02 17:02:03 +01:00 committed by Jakub Kicinski
parent d41c9dbd12
commit 02a68a47ea
3 changed files with 99 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

19
include/linux/netdevice.h
View File

@ -1999,6 +1999,11 @@ 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.
*/
@ -2349,9 +2354,22 @@ 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)
@ -2785,6 +2803,7 @@ enum netdev_cmd {
NETDEV_PRE_TYPE_CHANGE,
NETDEV_POST_TYPE_CHANGE,
NETDEV_POST_INIT,
NETDEV_PRE_UNINIT,
NETDEV_RELEASE,
NETDEV_NOTIFY_PEERS,
NETDEV_JOIN,

14
net/core/dev.c
View File

@ -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)
@ -10060,7 +10060,7 @@ 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);
@ -10107,6 +10107,8 @@ 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);
@ -10856,6 +10858,8 @@ void unregister_netdevice_many_notify(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);

75
net/core/devlink.c
View File

@ -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);
};
@ -9615,6 +9616,9 @@ 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
@ -9645,10 +9649,13 @@ 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;
@ -9675,6 +9682,12 @@ 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);
@ -9828,6 +9841,10 @@ 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);
@ -10121,6 +10138,56 @@ 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)
{