Allow the user-space to fine-grain query the shaping features
supported by the NIC on each domain.
Signed-off-by: Paolo Abeni <pab...@redhat.com>
---
v5 -> v6:
- shorter cap-related names
v4 -> v5:
- added pre/post helpers for dump op
---
Documentation/netlink/specs/net_shaper.yaml | 88 +++++++++++++++++++++
include/uapi/linux/net_shaper.h | 17 ++++
net/shaper/shaper.c | 32 ++++++++
net/shaper/shaper_nl_gen.c | 29 +++++++
net/shaper/shaper_nl_gen.h | 10 +++
5 files changed, 176 insertions(+)
diff --git a/Documentation/netlink/specs/net_shaper.yaml
b/Documentation/netlink/specs/net_shaper.yaml
index bbea2a91aa09..2c11b9861e65 100644
--- a/Documentation/netlink/specs/net_shaper.yaml
+++ b/Documentation/netlink/specs/net_shaper.yaml
@@ -26,6 +26,11 @@ doc: |
The user can query the running configuration via the @get operation.
+ Different devices can provide different feature sets, 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
@@ -148,6 +153,53 @@ attribute-sets:
name: priority
-
name: weight
+ -
+ name: caps
+ attributes:
+ -
+ name: ifindex
+ type: u32
+ doc: Interface index queried for shapers capabilities.
+ -
+ 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:
@@ -273,3 +325,39 @@ operations:
- leaves
reply:
attributes: *ns-binding
+
+ -
+ name: cap-get
+ doc: |
+ Get the shaper capabilities supported by the given device
+ for the specified scope.
+ attribute-set: caps
+
+ 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:
+ pre: net-shaper-nl-cap-pre-dumpit
+ post: net-shaper-nl-cap-post-dumpit
+ request:
+ attributes:
+ - ifindex
+ reply:
+ attributes: *cap-attrs
diff --git a/include/uapi/linux/net_shaper.h b/include/uapi/linux/net_shaper.h
index 9e3fa63618ee..d8834b59f7d7 100644
--- a/include/uapi/linux/net_shaper.h
+++ b/include/uapi/linux/net_shaper.h
@@ -65,11 +65,28 @@ enum {
NET_SHAPER_A_HANDLE_MAX = (__NET_SHAPER_A_HANDLE_MAX - 1)
};
+enum {
+ NET_SHAPER_A_CAPS_IFINDEX = 1,
+ NET_SHAPER_A_CAPS_SCOPE,
+ NET_SHAPER_A_CAPS_SUPPORT_METRIC_BPS,
+ NET_SHAPER_A_CAPS_SUPPORT_METRIC_PPS,
+ NET_SHAPER_A_CAPS_SUPPORT_NESTING,
+ NET_SHAPER_A_CAPS_SUPPORT_BW_MIN,
+ NET_SHAPER_A_CAPS_SUPPORT_BW_MAX,
+ NET_SHAPER_A_CAPS_SUPPORT_BURST,
+ NET_SHAPER_A_CAPS_SUPPORT_PRIORITY,
+ NET_SHAPER_A_CAPS_SUPPORT_WEIGHT,
+
+ __NET_SHAPER_A_CAPS_MAX,
+ NET_SHAPER_A_CAPS_MAX = (__NET_SHAPER_A_CAPS_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 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 @@ int net_shaper_nl_group_doit(struct sk_buff *skb, struct
genl_info *info)
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;
--
2.45.2
