Commit fc906e79 authored by Jakub Kicinski's avatar Jakub Kicinski
Browse files

Merge branch 'for-thermal-genetlink-family-bind-unbind-callbacks' 

Stanislaw Gruszka says:

====================
thermal/netlink/intel_hfi: Enable HFI feature only when required

The patchset introduces a new genetlink family bind/unbind callbacks
and thermal/netlink notifications, which allow drivers to send netlink
multicast events based on the presence of actual user-space consumers.
This functionality optimizes resource usage by allowing disabling
of features when not needed.

v1: https://lore.kernel.org/linux-pm/20240131120535.933424-1-stanislaw.gruszka@linux.intel.com//
v2: https://lore.kernel.org/linux-pm/20240206133605.1518373-1-stanislaw.gruszka@linux.intel.com/
v3: https://lore.kernel.org/linux-pm/20240209120625.1775017-1-stanislaw.gruszka@linux.intel.com/
====================

Link: https://lore.kernel.org/r/20240212161615.161935-1-stanislaw.gruszka@linux.intel.com


Signed-off-by: default avatarJakub Kicinski <kuba@kernel.org>
parents 3738d710 3de21a89

include/net/genetlink.h

+4 −0
Original line number Diff line number Diff line
@@ -41,6 +41,8 @@ struct genl_info; 
 *	do additional, common, filtering and return an error

 * @post_doit: called after an operation's doit callback, it may

 *	undo operations done by pre_doit, for example release locks

 * @bind: called when family multicast group is added to a netlink socket

 * @unbind: called when family multicast group is removed from a netlink socket

 * @module: pointer to the owning module (set to THIS_MODULE)

 * @mcgrps: multicast groups used by this family

 * @n_mcgrps: number of multicast groups
@@ -84,6 +86,8 @@ struct genl_family { 
	void			(*post_doit)(const struct genl_split_ops *ops,

					     struct sk_buff *skb,

					     struct genl_info *info);

	int			(*bind)(int mcgrp);

	void			(*unbind)(int mcgrp);

	const struct genl_ops *	ops;

	const struct genl_small_ops *small_ops;

	const struct genl_split_ops *split_ops;

net/netlink/genetlink.c

+30 −0
Original line number Diff line number Diff line
@@ -1836,6 +1836,9 @@ static int genl_bind(struct net *net, int group) 
		    !ns_capable(net->user_ns, CAP_SYS_ADMIN))

			ret = -EPERM;



		if (family->bind)

			family->bind(i);



		break;

	}
@@ -1843,12 +1846,39 @@ static int genl_bind(struct net *net, int group) 
	return ret;

}



static void genl_unbind(struct net *net, int group)

{

	const struct genl_family *family;

	unsigned int id;



	down_read(&cb_lock);



	idr_for_each_entry(&genl_fam_idr, family, id) {

		int i;



		if (family->n_mcgrps == 0)

			continue;



		i = group - family->mcgrp_offset;

		if (i < 0 || i >= family->n_mcgrps)

			continue;



		if (family->unbind)

			family->unbind(i);



		break;

	}



	up_read(&cb_lock);

}



static int __net_init genl_pernet_init(struct net *net)

{

	struct netlink_kernel_cfg cfg = {

		.input		= genl_rcv,

		.flags		= NL_CFG_F_NONROOT_RECV,

		.bind		= genl_bind,

		.unbind		= genl_unbind,

		.release	= genl_release,

	};