From 8c713dc93ca9a423d6af8849c9254742a1070c37 Mon Sep 17 00:00:00 2001 From: Johannes Berg Date: Sat, 12 Jun 2021 10:20:54 +0200 Subject: [PATCH] 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 Signed-off-by: Sergey Ryazanov Signed-off-by: David S. Miller --- include/net/rtnetlink.h | 8 ++++++++ net/core/rtnetlink.c | 19 ++++++++++++++----- 2 files changed, 22 insertions(+), 5 deletions(-) diff --git a/include/net/rtnetlink.h b/include/net/rtnetlink.h index 479f60ef..384e800 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 cd87c76..92c3e43 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]) { -- 2.7.4