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

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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: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Jakub Kicinski 2024-02-15 17:49:24 -08:00
commit fc906e7922
2 changed files with 34 additions and 0 deletions
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4
include/net/genetlink.h
View File

@ -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;

30
net/netlink/genetlink.c
View File

@ -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,
};