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Message-ID: <c0dba0fc07eafbdc890cbe762bac969330725635.1721851988.git.pabeni@redhat.com>
Date: Wed, 24 Jul 2024 22:24:51 +0200
From: Paolo Abeni <pabeni@...hat.com>
To: netdev@...r.kernel.org
Cc: Jakub Kicinski <kuba@...nel.org>,
	Jiri Pirko <jiri@...nulli.us>,
	Madhu Chittim <madhu.chittim@...el.com>,
	Sridhar Samudrala <sridhar.samudrala@...el.com>,
	Simon Horman <horms@...nel.org>,
	John Fastabend <john.fastabend@...il.com>,
	Sunil Kovvuri Goutham <sgoutham@...vell.com>,
	Jamal Hadi Salim <jhs@...atatu.com>
Subject: [PATCH RFC v2 05/11] netlink: spec: add shaper introspection support

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

Signed-off-by: Paolo Abeni <pabeni@...hat.com>
---
 Documentation/netlink/specs/shaper.yaml | 75 +++++++++++++++++++++++++
 include/uapi/linux/net_shaper.h         | 17 ++++++
 net/shaper/shaper.c                     | 11 ++++
 net/shaper/shaper_nl_gen.c              | 25 +++++++++
 net/shaper/shaper_nl_gen.h              |  3 +
 5 files changed, 131 insertions(+)

diff --git a/Documentation/netlink/specs/shaper.yaml b/Documentation/netlink/specs/shaper.yaml
index 7327f5596fdb..55bf4e49fb2f 100644
--- a/Documentation/netlink/specs/shaper.yaml
+++ b/Documentation/netlink/specs/shaper.yaml
@@ -169,6 +169,52 @@ attribute-sets:
         name: priority
       -
         name: weight
+  -
+    name: capabilities
+    attributes:
+      -
+        name: ifindex
+        type: u32
+      -
+        name: scope
+        type: u32
+        enum: scope
+        doc: The scope to which the queried capabilities apply
+      -
+        name: support-metric-bps
+        type: flag
+        doc: the device accepts 'bps' metric for bw-min, bw-max and burst
+      -
+        name: support-metric-pps
+        type: flag
+        doc: the device accepts 'pps' metric for bw-min, bw-max and burst
+      -
+        name: support-nesting
+        type: flag
+        doc: |
+          the device supports nesting shaper belonging to this scope
+          below 'detached' scoped shapers. Only 'queue' and 'detached'
+          scope and flag 'support-nesting'.
+      -
+        name: support-bw-min
+        type: flag
+        doc: the device supports a minimum guaranteed bw
+      -
+        name: support-bw-max
+        type: flag
+        doc: the device supports maximum bw shaping
+      -
+        name: support-burst
+        type: flag
+        doc: the device supports a maximum burst size
+      -
+        name: support-priority
+        type: flag
+        doc: the device supports priority scheduling
+      -
+        name: support-weight
+        type: flag
+        doc: the device supports weighted round robin scheduling
 
 operations:
   list:
@@ -260,3 +306,32 @@ operations:
         reply:
           attributes:
             - handle
+
+    -
+      name: cap-get
+      doc: |
+        Get / Dump the shaper capabilities supported by the given device
+      attribute-set: capabilities
+
+      do:
+        request:
+          attributes:
+            - ifindex
+            - scope
+        reply:
+          attributes: &cap-attrs
+            - support-metric-bps
+            - support-metric-pps
+            - support-nesting
+            - support-bw-min
+            - support-bw-max
+            - support-burst
+            - support-priority
+            - support-weight
+
+      dump:
+        request:
+          attributes:
+            - ifindex
+        reply:
+          attributes: *cap-attrs
diff --git a/include/uapi/linux/net_shaper.h b/include/uapi/linux/net_shaper.h
index ab3d4eb0e1ab..12d16d30472e 100644
--- a/include/uapi/linux/net_shaper.h
+++ b/include/uapi/linux/net_shaper.h
@@ -61,11 +61,28 @@ enum {
 	NET_SHAPER_A_MAX = (__NET_SHAPER_A_MAX - 1)
 };
 
+enum {
+	NET_SHAPER_A_CAPABILITIES_IFINDEX = 1,
+	NET_SHAPER_A_CAPABILITIES_SCOPE,
+	NET_SHAPER_A_CAPABILITIES_SUPPORT_METRIC_BPS,
+	NET_SHAPER_A_CAPABILITIES_SUPPORT_METRIC_PPS,
+	NET_SHAPER_A_CAPABILITIES_SUPPORT_NESTING,
+	NET_SHAPER_A_CAPABILITIES_SUPPORT_BW_MIN,
+	NET_SHAPER_A_CAPABILITIES_SUPPORT_BW_MAX,
+	NET_SHAPER_A_CAPABILITIES_SUPPORT_BURST,
+	NET_SHAPER_A_CAPABILITIES_SUPPORT_PRIORITY,
+	NET_SHAPER_A_CAPABILITIES_SUPPORT_WEIGHT,
+
+	__NET_SHAPER_A_CAPABILITIES_MAX,
+	NET_SHAPER_A_CAPABILITIES_MAX = (__NET_SHAPER_A_CAPABILITIES_MAX - 1)
+};
+
 enum {
 	NET_SHAPER_CMD_GET = 1,
 	NET_SHAPER_CMD_SET,
 	NET_SHAPER_CMD_DELETE,
 	NET_SHAPER_CMD_GROUP,
+	NET_SHAPER_CMD_CAP_GET,
 
 	__NET_SHAPER_CMD_MAX,
 	NET_SHAPER_CMD_MAX = (__NET_SHAPER_CMD_MAX - 1)
diff --git a/net/shaper/shaper.c b/net/shaper/shaper.c
index d99d000d7e7a..7b7e9a777929 100644
--- a/net/shaper/shaper.c
+++ b/net/shaper/shaper.c
@@ -836,6 +836,17 @@ int net_shaper_nl_group_doit(struct sk_buff *skb, struct genl_info *info)
 	return ret;
 }
 
+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;
+}
+
 void dev_shaper_flush(struct net_device *dev)
 {
 	struct xarray *xa = __sc_container(dev);
diff --git a/net/shaper/shaper_nl_gen.c b/net/shaper/shaper_nl_gen.c
index b444d1ff55a1..cc98d58c0862 100644
--- a/net/shaper/shaper_nl_gen.c
+++ b/net/shaper/shaper_nl_gen.c
@@ -67,6 +67,17 @@ static const struct nla_policy net_shaper_group_nl_policy[NET_SHAPER_A_OUTPUT +
 	[NET_SHAPER_A_OUTPUT] = NLA_POLICY_NESTED(net_shaper_ns_output_info_nl_policy),
 };
 
+/* NET_SHAPER_CMD_CAP_GET - do */
+static const struct nla_policy net_shaper_cap_get_do_nl_policy[NET_SHAPER_A_CAPABILITIES_SCOPE + 1] = {
+	[NET_SHAPER_A_CAPABILITIES_IFINDEX] = { .type = NLA_U32, },
+	[NET_SHAPER_A_CAPABILITIES_SCOPE] = NLA_POLICY_MAX(NLA_U32, 4),
+};
+
+/* NET_SHAPER_CMD_CAP_GET - dump */
+static const struct nla_policy net_shaper_cap_get_dump_nl_policy[NET_SHAPER_A_CAPABILITIES_IFINDEX + 1] = {
+	[NET_SHAPER_A_CAPABILITIES_IFINDEX] = { .type = NLA_U32, },
+};
+
 /* Ops table for net_shaper */
 static const struct genl_split_ops net_shaper_nl_ops[] = {
 	{
@@ -104,6 +115,20 @@ static const struct genl_split_ops net_shaper_nl_ops[] = {
 		.maxattr	= NET_SHAPER_A_OUTPUT,
 		.flags		= GENL_ADMIN_PERM | GENL_CMD_CAP_DO,
 	},
+	{
+		.cmd		= NET_SHAPER_CMD_CAP_GET,
+		.doit		= net_shaper_nl_cap_get_doit,
+		.policy		= net_shaper_cap_get_do_nl_policy,
+		.maxattr	= NET_SHAPER_A_CAPABILITIES_SCOPE,
+		.flags		= GENL_CMD_CAP_DO,
+	},
+	{
+		.cmd		= NET_SHAPER_CMD_CAP_GET,
+		.dumpit		= net_shaper_nl_cap_get_dumpit,
+		.policy		= net_shaper_cap_get_dump_nl_policy,
+		.maxattr	= NET_SHAPER_A_CAPABILITIES_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 00cee4efd21e..97fbd4502364 100644
--- a/net/shaper/shaper_nl_gen.h
+++ b/net/shaper/shaper_nl_gen.h
@@ -21,6 +21,9 @@ 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;
 
-- 
2.45.2


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