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Message-ID: <0e5fcb58af18ce3537be4652f2a805d3f0cb331e.1724165948.git.pabeni@redhat.com>
Date: Tue, 20 Aug 2024 17:12:28 +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>,
Donald Hunter <donald.hunter@...il.com>
Subject: [PATCH v4 net-next 07/12] 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/net_shaper.yaml | 84 +++++++++++++++++++++
include/uapi/linux/net_shaper.h | 17 +++++
net/shaper/shaper.c | 22 ++++++
net/shaper/shaper_nl_gen.c | 27 +++++++
net/shaper/shaper_nl_gen.h | 8 ++
5 files changed, 158 insertions(+)
diff --git a/Documentation/netlink/specs/net_shaper.yaml b/Documentation/netlink/specs/net_shaper.yaml
index a2b7900646ae..64d827176a61 100644
--- a/Documentation/netlink/specs/net_shaper.yaml
+++ b/Documentation/netlink/specs/net_shaper.yaml
@@ -20,6 +20,11 @@ doc: |
The user can query the running configuration via the @get operation.
+ Different devices can provide different feature set, e.g. with no
+ support for complex scheduling hierarchy, or for some shaping
+ parameters. The user can introspect the HW capabilities via the
+ @cap-get operation.
+
definitions:
-
type: enum
@@ -187,6 +192,52 @@ 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 'node' scoped shapers. Only 'queue' and 'node'
+ scope can have flag 'support-nesting'.
+ -
+ name: support-bw-min
+ type: flag
+ doc: The device supports a minimum guaranteed B/W.
+ -
+ name: support-bw-max
+ type: flag
+ doc: The device supports maximum B/W 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:
@@ -287,3 +338,36 @@ operations:
- root
reply:
attributes: *ns-binding
+
+ -
+ name: cap-get
+ doc: |
+ Get / Dump the shaper capabilities supported by the given device.
+ attribute-set: capabilities
+
+ do:
+ pre: net-shaper-nl-cap-pre-doit
+ post: net-shaper-nl-cap-post-doit
+ request:
+ attributes:
+ - ifindex
+ - scope
+ reply:
+ attributes: &cap-attrs
+ - ifindex
+ - scope
+ - 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 05917f10b021..70d9639f9345 100644
--- a/include/uapi/linux/net_shaper.h
+++ b/include/uapi/linux/net_shaper.h
@@ -60,11 +60,28 @@ 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 e5282c5bebe1..d3bb0ee1a18a 100644
--- a/net/shaper/shaper.c
+++ b/net/shaper/shaper.c
@@ -501,6 +501,17 @@ void net_shaper_nl_post_doit(const struct genl_split_ops *ops,
netdev_put(dev, NULL);
}
+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_get_doit(struct sk_buff *skb, struct genl_info *info)
{
struct net_device *dev = info->user_ptr[0];
@@ -1052,6 +1063,17 @@ 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 net_shaper_flush(struct net_device *dev)
{
struct xarray *xa = net_shaper_cache_container(dev);
diff --git a/net/shaper/shaper_nl_gen.c b/net/shaper/shaper_nl_gen.c
index b0a4bdf1f00a..04f9cbf3aee0 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_ROOT + 1]
[NET_SHAPER_A_ROOT] = NLA_POLICY_NESTED(net_shaper_root_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, 3),
+};
+
+/* 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[] = {
{
@@ -112,6 +123,22 @@ static const struct genl_split_ops net_shaper_nl_ops[] = {
.maxattr = NET_SHAPER_A_ROOT,
.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_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 9b0682c83a07..6cec8903f25b 100644
--- a/net/shaper/shaper_nl_gen.h
+++ b/net/shaper/shaper_nl_gen.h
@@ -18,15 +18,23 @@ extern const struct nla_policy net_shaper_root_info_nl_policy[NET_SHAPER_A_PAREN
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_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;
--
2.45.2
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