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devlink: Allocate devlink directly in requested net namespace

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There is no need in extra call indirection and check from impossible
flow where someone tries to set namespace without prior call
to devlink_alloc().

Instead of this extra logic and additional EXPORT_SYMBOL, use specialized
devlink allocation function that receives net namespace as an argument.

Such specialized API allows clear view when devlink initialized in wrong
net namespace and/or kernel users don't try to change devlink namespace
under the hood.

Reviewed-by: Jiri Pirko <jiri@nvidia.com>
Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Leon Romanovsky 2021-07-29 20:19:25 +03:00 committed by Jakub Kicinski
parent 05a7f4a8df
commit 2671345504
3 changed files with 22 additions and 22 deletions
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4
drivers/net/netdevsim/dev.c
View File

@ -1431,10 +1431,10 @@ int nsim_dev_probe(struct nsim_bus_dev *nsim_bus_dev)
struct devlink *devlink;
int err;
devlink = devlink_alloc(&nsim_dev_devlink_ops, sizeof(*nsim_dev));
devlink = devlink_alloc_ns(&nsim_dev_devlink_ops, sizeof(*nsim_dev),
nsim_bus_dev->initial_net);
if (!devlink)
return -ENOMEM;
devlink_net_set(devlink, nsim_bus_dev->initial_net);
nsim_dev = devlink_priv(devlink);
nsim_dev->nsim_bus_dev = nsim_bus_dev;
nsim_dev->switch_id.id_len = sizeof(nsim_dev->switch_id.id);

14
include/net/devlink.h
View File

@ -1540,8 +1540,18 @@ static inline struct devlink *netdev_to_devlink(struct net_device *dev)
struct ib_device;
struct net *devlink_net(const struct devlink *devlink);
void devlink_net_set(struct devlink *devlink, struct net *net);
struct devlink *devlink_alloc(const struct devlink_ops *ops, size_t priv_size);
/* This call is intended for software devices that can create
* devlink instances in other namespaces than init_net.
*
* Drivers that operate on real HW must use devlink_alloc() instead.
*/
struct devlink *devlink_alloc_ns(const struct devlink_ops *ops,
size_t priv_size, struct net *net);
static inline struct devlink *devlink_alloc(const struct devlink_ops *ops,
size_t priv_size)
{
return devlink_alloc_ns(ops, priv_size, &init_net);
}
int devlink_register(struct devlink *devlink, struct device *dev);
void devlink_unregister(struct devlink *devlink);
void devlink_reload_enable(struct devlink *devlink);

26
net/core/devlink.c
View File

@ -108,19 +108,6 @@ struct net *devlink_net(const struct devlink *devlink)
}
EXPORT_SYMBOL_GPL(devlink_net);
static void __devlink_net_set(struct devlink *devlink, struct net *net)
{
write_pnet(&devlink->_net, net);
}
void devlink_net_set(struct devlink *devlink, struct net *net)
{
if (WARN_ON(devlink->dev))
return;
__devlink_net_set(devlink, net);
}
EXPORT_SYMBOL_GPL(devlink_net_set);
static struct devlink *devlink_get_from_attrs(struct net *net,
struct nlattr **attrs)
{
@ -3921,7 +3908,7 @@ static int devlink_reload(struct devlink *devlink, struct net *dest_net,
return err;
if (dest_net && !net_eq(dest_net, curr_net))
__devlink_net_set(devlink, dest_net);
write_pnet(&devlink->_net, dest_net);
err = devlink->ops->reload_up(devlink, action, limit, actions_performed, extack);
devlink_reload_failed_set(devlink, !!err);
@ -8776,15 +8763,18 @@ static bool devlink_reload_actions_valid(const struct devlink_ops *ops)
}
/**
* devlink_alloc - Allocate new devlink instance resources
* devlink_alloc_ns - Allocate new devlink instance resources
* in specific namespace
*
* @ops: ops
* @priv_size: size of user private data
* @net: net namespace
*
* Allocate new devlink instance resources, including devlink index
* and name.
*/
struct devlink *devlink_alloc(const struct devlink_ops *ops, size_t priv_size)
struct devlink *devlink_alloc_ns(const struct devlink_ops *ops,
size_t priv_size, struct net *net)
{
struct devlink *devlink;
@ -8799,7 +8789,7 @@ struct devlink *devlink_alloc(const struct devlink_ops *ops, size_t priv_size)
return NULL;
devlink->ops = ops;
xa_init_flags(&devlink->snapshot_ids, XA_FLAGS_ALLOC);
__devlink_net_set(devlink, &init_net);
write_pnet(&devlink->_net, net);
INIT_LIST_HEAD(&devlink->port_list);
INIT_LIST_HEAD(&devlink->rate_list);
INIT_LIST_HEAD(&devlink->sb_list);
@ -8815,7 +8805,7 @@ struct devlink *devlink_alloc(const struct devlink_ops *ops, size_t priv_size)
mutex_init(&devlink->reporters_lock);
return devlink;
}
EXPORT_SYMBOL_GPL(devlink_alloc);
EXPORT_SYMBOL_GPL(devlink_alloc_ns);
/**
* devlink_register - Register devlink instance