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authorJohannes Berg <johannes.berg@intel.com>2021-06-12 11:20:54 +0300
committerDavid S. Miller <davem@davemloft.net>2021-06-12 23:16:45 +0300
commit8c713dc93ca9a423d6af8849c9254742a1070c37 (patch)
tree0e1fd314f469a3ddadf83411fc74df9ca35ff8b4
parent73214a690c50a134bd364e1a4430e0e7ac81a8d8 (diff)
downloadlinux-8c713dc93ca9a423d6af8849c9254742a1070c37.tar.xz
rtnetlink: add alloc() method to rtnl_link_ops
In order to make rtnetlink ops that can create different kinds of devices, like what we want to add to the WWAN framework, the priv_size and setup parameters aren't quite sufficient. Make this easier to manage by allowing ops to allocate their own netdev via an @alloc method that gets the tb netlink data. Signed-off-by: Johannes Berg <johannes.berg@intel.com> Signed-off-by: Sergey Ryazanov <ryazanov.s.a@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--include/net/rtnetlink.h8
-rw-r--r--net/core/rtnetlink.c19
2 files changed, 22 insertions, 5 deletions
diff --git a/include/net/rtnetlink.h b/include/net/rtnetlink.h
index 479f60ef54c0..384e800665f2 100644
--- a/include/net/rtnetlink.h
+++ b/include/net/rtnetlink.h
@@ -37,6 +37,9 @@ static inline int rtnl_msg_family(const struct nlmsghdr *nlh)
* @maxtype: Highest device specific netlink attribute number
* @policy: Netlink policy for device specific attribute validation
* @validate: Optional validation function for netlink/changelink parameters
+ * @alloc: netdev allocation function, can be %NULL and is then used
+ * in place of alloc_netdev_mqs(), in this case @priv_size
+ * and @setup are unused. Returns a netdev or ERR_PTR().
* @priv_size: sizeof net_device private space
* @setup: net_device setup function
* @newlink: Function for configuring and registering a new device
@@ -63,6 +66,11 @@ struct rtnl_link_ops {
const char *kind;
size_t priv_size;
+ struct net_device *(*alloc)(struct nlattr *tb[],
+ const char *ifname,
+ unsigned char name_assign_type,
+ unsigned int num_tx_queues,
+ unsigned int num_rx_queues);
void (*setup)(struct net_device *dev);
bool netns_refund;
diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index cd87c7661c72..92c3e43db812 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -376,12 +376,12 @@ int __rtnl_link_register(struct rtnl_link_ops *ops)
if (rtnl_link_ops_get(ops->kind))
return -EEXIST;
- /* The check for setup is here because if ops
+ /* The check for alloc/setup is here because if ops
* does not have that filled up, it is not possible
* to use the ops for creating device. So do not
* fill up dellink as well. That disables rtnl_dellink.
*/
- if (ops->setup && !ops->dellink)
+ if ((ops->alloc || ops->setup) && !ops->dellink)
ops->dellink = unregister_netdevice_queue;
list_add_tail(&ops->list, &link_ops);
@@ -3165,8 +3165,17 @@ struct net_device *rtnl_create_link(struct net *net, const char *ifname,
return ERR_PTR(-EINVAL);
}
- dev = alloc_netdev_mqs(ops->priv_size, ifname, name_assign_type,
- ops->setup, num_tx_queues, num_rx_queues);
+ if (ops->alloc) {
+ dev = ops->alloc(tb, ifname, name_assign_type,
+ num_tx_queues, num_rx_queues);
+ if (IS_ERR(dev))
+ return dev;
+ } else {
+ dev = alloc_netdev_mqs(ops->priv_size, ifname,
+ name_assign_type, ops->setup,
+ num_tx_queues, num_rx_queues);
+ }
+
if (!dev)
return ERR_PTR(-ENOMEM);
@@ -3399,7 +3408,7 @@ replay:
return -EOPNOTSUPP;
}
- if (!ops->setup)
+ if (!ops->alloc && !ops->setup)
return -EOPNOTSUPP;
if (!ifname[0]) {