netlink: spec: add shaper introspection support

Allow the user-space to fine-grain query the shaping features
supported by the NIC on each domain.

Reviewed-by: Jiri Pirko <jiri@nvidia.com>
Reviewed-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Link: https://patch.msgid.link/3ddd10e450e3fe7d4b944c0d0b886d4483529ee6.1728460186.git.pabeni@redhat.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

3 files changed, 71 insertions, 0 deletions

diff --git a/net/shaper/shaper.c b/net/shaper/shaper.c
index 85ad172833fc..92c8da046391 100644
--- a/net/shaper/shaper.c
+++ b/net/shaper/shaper.c
@@ -598,6 +598,27 @@ int net_shaper_nl_post_dumpit(struct netlink_callback *cb)
 	return 0;
 }
 
+int net_shaper_nl_cap_pre_doit(const struct genl_split_ops *ops,
+			       struct sk_buff *skb, struct genl_info *info)
+{
+	return -EOPNOTSUPP;
+}
+
+void net_shaper_nl_cap_post_doit(const struct genl_split_ops *ops,
+				 struct sk_buff *skb, struct genl_info *info)
+{
+}
+
+int net_shaper_nl_cap_pre_dumpit(struct netlink_callback *cb)
+{
+	return -EOPNOTSUPP;
+}
+
+int net_shaper_nl_cap_post_dumpit(struct netlink_callback *cb)
+{
+	return -EOPNOTSUPP;
+}
+
 int net_shaper_nl_get_doit(struct sk_buff *skb, struct genl_info *info)
 {
 	struct net_shaper_binding *binding;
@@ -1126,6 +1147,17 @@ free_msg:
 	goto free_leaves;
 }
 
+int net_shaper_nl_cap_get_doit(struct sk_buff *skb, struct genl_info *info)
+{
+	return 0;
+}
+
+int net_shaper_nl_cap_get_dumpit(struct sk_buff *skb,
+				 struct netlink_callback *cb)
+{
+	return 0;
+}
+
 static void net_shaper_flush(struct net_shaper_binding *binding)
 {
 	struct net_shaper_hierarchy *hierarchy = net_shaper_hierarchy(binding);
diff --git a/net/shaper/shaper_nl_gen.c b/net/shaper/shaper_nl_gen.c
index 34185c5989e6..204c8ae8c7b1 100644
--- a/net/shaper/shaper_nl_gen.c
+++ b/net/shaper/shaper_nl_gen.c
@@ -65,6 +65,17 @@ static const struct nla_policy net_shaper_group_nl_policy[NET_SHAPER_A_LEAVES +
 	[NET_SHAPER_A_LEAVES] = NLA_POLICY_NESTED(net_shaper_leaf_info_nl_policy),
 };
 
+/* NET_SHAPER_CMD_CAP_GET - do */
+static const struct nla_policy net_shaper_cap_get_do_nl_policy[NET_SHAPER_A_CAPS_SCOPE + 1] = {
+	[NET_SHAPER_A_CAPS_IFINDEX] = { .type = NLA_U32, },
+	[NET_SHAPER_A_CAPS_SCOPE] = NLA_POLICY_MAX(NLA_U32, 3),
+};
+
+/* NET_SHAPER_CMD_CAP_GET - dump */
+static const struct nla_policy net_shaper_cap_get_dump_nl_policy[NET_SHAPER_A_CAPS_IFINDEX + 1] = {
+	[NET_SHAPER_A_CAPS_IFINDEX] = { .type = NLA_U32, },
+};
+
 /* Ops table for net_shaper */
 static const struct genl_split_ops net_shaper_nl_ops[] = {
 	{
@@ -112,6 +123,24 @@ static const struct genl_split_ops net_shaper_nl_ops[] = {
 		.maxattr	= NET_SHAPER_A_LEAVES,
 		.flags		= GENL_ADMIN_PERM | GENL_CMD_CAP_DO,
 	},
+	{
+		.cmd		= NET_SHAPER_CMD_CAP_GET,
+		.pre_doit	= net_shaper_nl_cap_pre_doit,
+		.doit		= net_shaper_nl_cap_get_doit,
+		.post_doit	= net_shaper_nl_cap_post_doit,
+		.policy		= net_shaper_cap_get_do_nl_policy,
+		.maxattr	= NET_SHAPER_A_CAPS_SCOPE,
+		.flags		= GENL_CMD_CAP_DO,
+	},
+	{
+		.cmd		= NET_SHAPER_CMD_CAP_GET,
+		.start		= net_shaper_nl_cap_pre_dumpit,
+		.dumpit		= net_shaper_nl_cap_get_dumpit,
+		.done		= net_shaper_nl_cap_post_dumpit,
+		.policy		= net_shaper_cap_get_dump_nl_policy,
+		.maxattr	= NET_SHAPER_A_CAPS_IFINDEX,
+		.flags		= GENL_CMD_CAP_DUMP,
+	},
 };
 
 struct genl_family net_shaper_nl_family __ro_after_init = {
diff --git a/net/shaper/shaper_nl_gen.h b/net/shaper/shaper_nl_gen.h
index 016cb6f3187b..cb7f9026fc23 100644
--- a/net/shaper/shaper_nl_gen.h
+++ b/net/shaper/shaper_nl_gen.h
@@ -17,17 +17,27 @@ extern const struct nla_policy net_shaper_leaf_info_nl_policy[NET_SHAPER_A_WEIGH
 
 int net_shaper_nl_pre_doit(const struct genl_split_ops *ops,
 			   struct sk_buff *skb, struct genl_info *info);
+int net_shaper_nl_cap_pre_doit(const struct genl_split_ops *ops,
+			       struct sk_buff *skb, struct genl_info *info);
 void
 net_shaper_nl_post_doit(const struct genl_split_ops *ops, struct sk_buff *skb,
 			struct genl_info *info);
+void
+net_shaper_nl_cap_post_doit(const struct genl_split_ops *ops,
+			    struct sk_buff *skb, struct genl_info *info);
 int net_shaper_nl_pre_dumpit(struct netlink_callback *cb);
+int net_shaper_nl_cap_pre_dumpit(struct netlink_callback *cb);
 int net_shaper_nl_post_dumpit(struct netlink_callback *cb);
+int net_shaper_nl_cap_post_dumpit(struct netlink_callback *cb);
 
 int net_shaper_nl_get_doit(struct sk_buff *skb, struct genl_info *info);
 int net_shaper_nl_get_dumpit(struct sk_buff *skb, struct netlink_callback *cb);
 int net_shaper_nl_set_doit(struct sk_buff *skb, struct genl_info *info);
 int net_shaper_nl_delete_doit(struct sk_buff *skb, struct genl_info *info);
 int net_shaper_nl_group_doit(struct sk_buff *skb, struct genl_info *info);
+int net_shaper_nl_cap_get_doit(struct sk_buff *skb, struct genl_info *info);
+int net_shaper_nl_cap_get_dumpit(struct sk_buff *skb,
+				 struct netlink_callback *cb);
 
 extern struct genl_family net_shaper_nl_family;