From: Or Har-Toov <ohartoov@nvidia.com>
Add support for userspace to query resources registered on devlink
ports, allowing drivers to expose per-port resource limits and usage.
Example output:
$ devlink port resource show
pci/0000:03:00.0/196608:
name max_SFs size 20 unit entry
pci/0000:03:00.1/262144:
name max_SFs size 20 unit entry
$ devlink port resource show pci/0000:03:00.0/196608
pci/0000:03:00.0/196608:
name max_SFs size 20 unit entry
Signed-off-by: Or Har-Toov <ohartoov@nvidia.com>
Reviewed-by: Shay Drori <shayd@nvidia.com>
Reviewed-by: Moshe Shemesh <moshe@nvidia.com>
Reviewed-by: Jiri Pirko <jiri@nvidia.com>
Signed-off-by: Tariq Toukan <tariqt@nvidia.com>
---
Documentation/netlink/specs/devlink.yaml | 23 ++++++
include/uapi/linux/devlink.h | 3 +
net/devlink/devl_internal.h | 4 ++
net/devlink/netlink.c | 2 +-
net/devlink/netlink_gen.c | 32 ++++++++-
net/devlink/netlink_gen.h | 6 +-
net/devlink/resource.c | 90 +++++++++++++++++++++++-
7 files changed, 155 insertions(+), 5 deletions(-)
diff --git a/Documentation/netlink/specs/devlink.yaml b/Documentation/netlink/specs/devlink.yaml
index ee679ac14261..9b813f5fc51c 100644
--- a/Documentation/netlink/specs/devlink.yaml
+++ b/Documentation/netlink/specs/devlink.yaml
@@ -2340,3 +2340,26 @@ operations:
- bus-name
- dev-name
- port-index
+
+ -
+ name: port-resource-get
+ doc: Get port resources.
+ attribute-set: devlink
+ dont-validate: [strict]
+ do:
+ pre: devlink-nl-pre-doit-port
+ post: devlink-nl-post-doit
+ request:
+ value: 85
+ attributes: *port-id-attrs
+ reply: &port-resource-get-reply
+ value: 85
+ attributes:
+ - bus-name
+ - dev-name
+ - port-index
+ - resource-list
+ dump:
+ request:
+ attributes: *dev-id-attrs
+ reply: *port-resource-get-reply
diff --git a/include/uapi/linux/devlink.h b/include/uapi/linux/devlink.h
index e7d6b6d13470..1cabd1f6cba0 100644
--- a/include/uapi/linux/devlink.h
+++ b/include/uapi/linux/devlink.h
@@ -141,6 +141,9 @@ enum devlink_command {
DEVLINK_CMD_NOTIFY_FILTER_SET,
+ DEVLINK_CMD_PORT_RESOURCE_GET, /* can dump */
+ DEVLINK_CMD_PORT_RESOURCE_SET,
+
/* add new commands above here */
__DEVLINK_CMD_MAX,
DEVLINK_CMD_MAX = __DEVLINK_CMD_MAX - 1
diff --git a/net/devlink/devl_internal.h b/net/devlink/devl_internal.h
index 1377864383bc..ddf855bc893f 100644
--- a/net/devlink/devl_internal.h
+++ b/net/devlink/devl_internal.h
@@ -148,6 +148,10 @@ struct devlink_nl_dump_state {
struct {
u64 dump_ts;
};
+ /* DEVLINK_CMD_PORT_RESOURCE_GET - dump */
+ struct {
+ unsigned long port_index;
+ };
};
};
diff --git a/net/devlink/netlink.c b/net/devlink/netlink.c
index 593605c1b1ef..c78c31779622 100644
--- a/net/devlink/netlink.c
+++ b/net/devlink/netlink.c
@@ -367,7 +367,7 @@ struct genl_family devlink_nl_family __ro_after_init = {
.module = THIS_MODULE,
.split_ops = devlink_nl_ops,
.n_split_ops = ARRAY_SIZE(devlink_nl_ops),
- .resv_start_op = DEVLINK_CMD_SELFTESTS_RUN + 1,
+ .resv_start_op = DEVLINK_CMD_PORT_RESOURCE_GET + 1,
.mcgrps = devlink_nl_mcgrps,
.n_mcgrps = ARRAY_SIZE(devlink_nl_mcgrps),
.sock_priv_size = sizeof(struct devlink_nl_sock_priv),
diff --git a/net/devlink/netlink_gen.c b/net/devlink/netlink_gen.c
index d6667a3f87a0..a235748d0688 100644
--- a/net/devlink/netlink_gen.c
+++ b/net/devlink/netlink_gen.c
@@ -610,8 +610,21 @@ static const struct nla_policy devlink_notify_filter_set_nl_policy[DEVLINK_ATTR_
[DEVLINK_ATTR_PORT_INDEX] = { .type = NLA_U32, },
};
+/* DEVLINK_CMD_PORT_RESOURCE_GET - do */
+static const struct nla_policy devlink_port_resource_get_do_nl_policy[DEVLINK_ATTR_PORT_INDEX + 1] = {
+ [DEVLINK_ATTR_BUS_NAME] = { .type = NLA_NUL_STRING, },
+ [DEVLINK_ATTR_DEV_NAME] = { .type = NLA_NUL_STRING, },
+ [DEVLINK_ATTR_PORT_INDEX] = { .type = NLA_U32, },
+};
+
+/* DEVLINK_CMD_PORT_RESOURCE_GET - dump */
+static const struct nla_policy devlink_port_resource_get_dump_nl_policy[DEVLINK_ATTR_DEV_NAME + 1] = {
+ [DEVLINK_ATTR_BUS_NAME] = { .type = NLA_NUL_STRING, },
+ [DEVLINK_ATTR_DEV_NAME] = { .type = NLA_NUL_STRING, },
+};
+
/* Ops table for devlink */
-const struct genl_split_ops devlink_nl_ops[75] = {
+const struct genl_split_ops devlink_nl_ops[77] = {
{
.cmd = DEVLINK_CMD_GET,
.validate = GENL_DONT_VALIDATE_STRICT,
@@ -1297,4 +1310,21 @@ const struct genl_split_ops devlink_nl_ops[75] = {
.maxattr = DEVLINK_ATTR_PORT_INDEX,
.flags = GENL_CMD_CAP_DO,
},
+ {
+ .cmd = DEVLINK_CMD_PORT_RESOURCE_GET,
+ .validate = GENL_DONT_VALIDATE_STRICT,
+ .pre_doit = devlink_nl_pre_doit_port,
+ .doit = devlink_nl_port_resource_get_doit,
+ .post_doit = devlink_nl_post_doit,
+ .policy = devlink_port_resource_get_do_nl_policy,
+ .maxattr = DEVLINK_ATTR_PORT_INDEX,
+ .flags = GENL_CMD_CAP_DO,
+ },
+ {
+ .cmd = DEVLINK_CMD_PORT_RESOURCE_GET,
+ .dumpit = devlink_nl_port_resource_get_dumpit,
+ .policy = devlink_port_resource_get_dump_nl_policy,
+ .maxattr = DEVLINK_ATTR_DEV_NAME,
+ .flags = GENL_CMD_CAP_DUMP,
+ },
};
diff --git a/net/devlink/netlink_gen.h b/net/devlink/netlink_gen.h
index d79f6a0888f6..cab9d30e913a 100644
--- a/net/devlink/netlink_gen.h
+++ b/net/devlink/netlink_gen.h
@@ -18,7 +18,7 @@ extern const struct nla_policy devlink_dl_rate_tc_bws_nl_policy[DEVLINK_RATE_TC_
extern const struct nla_policy devlink_dl_selftest_id_nl_policy[DEVLINK_ATTR_SELFTEST_ID_FLASH + 1];
/* Ops table for devlink */
-extern const struct genl_split_ops devlink_nl_ops[75];
+extern const struct genl_split_ops devlink_nl_ops[77];
int devlink_nl_pre_doit(const struct genl_split_ops *ops, struct sk_buff *skb,
struct genl_info *info);
@@ -148,5 +148,9 @@ int devlink_nl_selftests_get_dumpit(struct sk_buff *skb,
int devlink_nl_selftests_run_doit(struct sk_buff *skb, struct genl_info *info);
int devlink_nl_notify_filter_set_doit(struct sk_buff *skb,
struct genl_info *info);
+int devlink_nl_port_resource_get_doit(struct sk_buff *skb,
+ struct genl_info *info);
+int devlink_nl_port_resource_get_dumpit(struct sk_buff *skb,
+ struct netlink_callback *cb);
#endif /* _LINUX_DEVLINK_GEN_H */
diff --git a/net/devlink/resource.c b/net/devlink/resource.c
index 71f00e580f59..0a1d1610ff67 100644
--- a/net/devlink/resource.c
+++ b/net/devlink/resource.c
@@ -252,6 +252,7 @@ static int __devlink_resource_fill(struct genl_info *info,
struct list_head *resource_list_head,
enum devlink_command cmd, int flags)
{
+ struct devlink_port *devlink_port = info->user_ptr[1];
struct devlink *devlink = info->user_ptr[0];
struct nlattr *resources_attr;
struct sk_buff *skb = NULL;
@@ -279,9 +280,13 @@ static int __devlink_resource_fill(struct genl_info *info,
if (devlink_nl_put_handle(skb, devlink))
goto nla_put_failure;
+ if (devlink_port) {
+ if (nla_put_u32(skb, DEVLINK_ATTR_PORT_INDEX,
+ devlink_port->index))
+ goto nla_put_failure;
+ }
- resources_attr = nla_nest_start_noflag(skb,
- DEVLINK_ATTR_RESOURCE_LIST);
+ resources_attr = nla_nest_start_noflag(skb, DEVLINK_ATTR_RESOURCE_LIST);
if (!resources_attr)
goto nla_put_failure;
@@ -656,3 +661,84 @@ void devl_port_resources_unregister(struct devlink_port *devlink_port)
&devlink_port->resource_list);
}
EXPORT_SYMBOL_GPL(devl_port_resources_unregister);
+
+int devlink_nl_port_resource_get_doit(struct sk_buff *skb,
+ struct genl_info *info)
+{
+ struct devlink_port *devlink_port = info->user_ptr[1];
+
+ return __devlink_resource_fill(info, &devlink_port->resource_list,
+ DEVLINK_CMD_PORT_RESOURCE_GET, 0);
+}
+
+static int
+devlink_nl_port_resource_get_dump_one(struct sk_buff *skb,
+ struct devlink *devlink,
+ struct netlink_callback *cb, int flags)
+{
+ struct devlink_nl_dump_state *state = devlink_dump_state(cb);
+ struct devlink_port *devlink_port;
+ struct list_head *resource_list;
+ struct nlattr *resources_attr;
+ int resource_idx, start_idx;
+ unsigned long port_idx;
+ void *hdr;
+ int err;
+
+ xa_for_each_start(&devlink->ports, port_idx, devlink_port,
+ state->port_index) {
+ if (list_empty(&devlink_port->resource_list))
+ continue;
+
+ resource_idx = (port_idx == state->port_index) ? state->idx : 0;
+ start_idx = resource_idx;
+ err = -EMSGSIZE;
+
+ hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid,
+ cb->nlh->nlmsg_seq, &devlink_nl_family, flags,
+ DEVLINK_CMD_PORT_RESOURCE_GET);
+ if (!hdr)
+ return err;
+
+ if (devlink_nl_put_handle(skb, devlink) ||
+ nla_put_u32(skb, DEVLINK_ATTR_PORT_INDEX,
+ devlink_port->index))
+ goto nla_put_failure;
+
+ resources_attr =
+ nla_nest_start_noflag(skb, DEVLINK_ATTR_RESOURCE_LIST);
+ if (!resources_attr)
+ goto nla_put_failure;
+
+ resource_list = &devlink_port->resource_list;
+ err = devlink_resource_list_fill(skb, devlink, resource_list,
+ &resource_idx);
+ if (err) {
+ state->port_index = port_idx;
+ state->idx = resource_idx;
+ if (resource_idx == start_idx)
+ goto nla_put_failure_unwind;
+ nla_nest_end(skb, resources_attr);
+ genlmsg_end(skb, hdr);
+ return err;
+ }
+ nla_nest_end(skb, resources_attr);
+ genlmsg_end(skb, hdr);
+ }
+ state->port_index = 0;
+ state->idx = 0;
+ return 0;
+
+nla_put_failure_unwind:
+ nla_nest_cancel(skb, resources_attr);
+nla_put_failure:
+ genlmsg_cancel(skb, hdr);
+ return err;
+}
+
+int devlink_nl_port_resource_get_dumpit(struct sk_buff *skb,
+ struct netlink_callback *cb)
+{
+ return devlink_nl_dumpit(skb, cb,
+ devlink_nl_port_resource_get_dump_one);
+}
--
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