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Message-ID: <20260205142833.1727929-4-tariqt@nvidia.com>
Date: Thu, 5 Feb 2026 16:28:29 +0200
From: Tariq Toukan <tariqt@...dia.com>
To: Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>, Andrew Lunn <andrew+netdev@...n.ch>, "David
S. Miller" <davem@...emloft.net>
CC: Donald Hunter <donald.hunter@...il.com>, Jiri Pirko <jiri@...nulli.us>,
Jonathan Corbet <corbet@....net>, Saeed Mahameed <saeedm@...dia.com>, "Leon
Romanovsky" <leon@...nel.org>, Tariq Toukan <tariqt@...dia.com>, Mark Bloch
<mbloch@...dia.com>, Shuah Khan <shuah@...nel.org>, <netdev@...r.kernel.org>,
<linux-kernel@...r.kernel.org>, <linux-doc@...r.kernel.org>,
<linux-rdma@...r.kernel.org>, <linux-kselftest@...r.kernel.org>, Gal Pressman
<gal@...dia.com>, Moshe Shemesh <moshe@...dia.com>, Shay Drori
<shayd@...dia.com>, Jiri Pirko <jiri@...dia.com>, Or Har-Toov
<ohartoov@...dia.com>
Subject: [PATCH net-next V2 3/7] devlink: Add port resource netlink command
From: Or Har-Toov <ohartoov@...dia.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@...dia.com>
Reviewed-by: Shay Drori <shayd@...dia.com>
Signed-off-by: Tariq Toukan <tariqt@...dia.com>
---
Documentation/netlink/specs/devlink.yaml | 23 ++++++
include/uapi/linux/devlink.h | 3 +
net/devlink/netlink.c | 2 +-
net/devlink/netlink_gen.c | 32 ++++++-
net/devlink/netlink_gen.h | 6 +-
net/devlink/resource.c | 101 +++++++++++++++++++++++
6 files changed, 164 insertions(+), 3 deletions(-)
diff --git a/Documentation/netlink/specs/devlink.yaml b/Documentation/netlink/specs/devlink.yaml
index 837112da6738..0290db1b8393 100644
--- a/Documentation/netlink/specs/devlink.yaml
+++ b/Documentation/netlink/specs/devlink.yaml
@@ -2336,3 +2336,26 @@ 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/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 f4c61c2b4f22..692d7862183a 100644
--- a/net/devlink/netlink_gen.c
+++ b/net/devlink/netlink_gen.c
@@ -604,8 +604,21 @@ 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[74] = {
+const struct genl_split_ops devlink_nl_ops[76] = {
{
.cmd = DEVLINK_CMD_GET,
.validate = GENL_DONT_VALIDATE_STRICT,
@@ -1284,4 +1297,21 @@ const struct genl_split_ops devlink_nl_ops[74] = {
.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 2817d53a0eba..204a665d2fd2 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[74];
+extern const struct genl_split_ops devlink_nl_ops[76];
int devlink_nl_pre_doit(const struct genl_split_ops *ops, struct sk_buff *skb,
struct genl_info *info);
@@ -146,5 +146,9 @@ 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 1b06a1f408fa..42ad7c96a740 100644
--- a/net/devlink/resource.c
+++ b/net/devlink/resource.c
@@ -227,6 +227,7 @@ static int devlink_resource_fill(struct genl_info *info,
struct list_head *resource_list,
enum devlink_command cmd, int flags)
{
+ struct devlink_port *devlink_port = info->user_ptr[1];
struct devlink *devlink = info->user_ptr[0];
struct devlink_resource *resource;
struct nlattr *resources_attr;
@@ -257,6 +258,10 @@ static int devlink_resource_fill(struct genl_info *info,
if (devlink_nl_put_handle(skb, devlink))
goto nla_put_failure;
+ if (devlink_port && 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)
@@ -576,3 +581,99 @@ void devl_port_resources_unregister(struct devlink_port *devlink_port)
&devlink_port->resource_list);
}
EXPORT_SYMBOL_GPL(devl_port_resources_unregister);
+
+static int devlink_nl_port_resource_fill(struct sk_buff *msg,
+ struct devlink_port *devlink_port,
+ enum devlink_command cmd,
+ u32 portid, u32 seq, int flags)
+{
+ struct devlink *devlink = devlink_port->devlink;
+ struct devlink_resource *resource;
+ struct nlattr *resources_attr;
+ void *hdr;
+
+ if (list_empty(&devlink_port->resource_list))
+ return 0;
+
+ hdr = genlmsg_put(msg, portid, seq, &devlink_nl_family, flags, cmd);
+ if (!hdr)
+ return -EMSGSIZE;
+
+ if (devlink_nl_put_handle(msg, devlink))
+ goto nla_put_failure;
+ if (nla_put_u32(msg, DEVLINK_ATTR_PORT_INDEX, devlink_port->index))
+ goto nla_put_failure;
+
+ resources_attr = nla_nest_start_noflag(msg, DEVLINK_ATTR_RESOURCE_LIST);
+ if (!resources_attr)
+ goto nla_put_failure;
+
+ list_for_each_entry(resource, &devlink_port->resource_list, list) {
+ if (devlink_resource_put(devlink, msg, resource)) {
+ nla_nest_cancel(msg, resources_attr);
+ goto nla_put_failure;
+ }
+ }
+ nla_nest_end(msg, resources_attr);
+ genlmsg_end(msg, hdr);
+ return 0;
+
+nla_put_failure:
+ genlmsg_cancel(msg, hdr);
+ return -EMSGSIZE;
+}
+
+int devlink_nl_port_resource_get_doit(struct sk_buff *skb,
+ struct genl_info *info)
+{
+ struct devlink_port *devlink_port = info->user_ptr[1];
+ struct sk_buff *msg;
+ int err;
+
+ msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
+ if (!msg)
+ return -ENOMEM;
+
+ err = devlink_nl_port_resource_fill(msg, devlink_port,
+ DEVLINK_CMD_PORT_RESOURCE_GET,
+ info->snd_portid, info->snd_seq, 0);
+ if (err) {
+ nlmsg_free(msg);
+ return err;
+ }
+
+ return genlmsg_reply(msg, info);
+}
+
+static int
+devlink_nl_port_resource_get_dump_one(struct sk_buff *msg,
+ struct devlink *devlink,
+ struct netlink_callback *cb, int flags)
+{
+ enum devlink_command cmd = DEVLINK_CMD_PORT_RESOURCE_GET;
+ struct devlink_nl_dump_state *state = devlink_dump_state(cb);
+ struct devlink_port *devlink_port;
+ unsigned long port_index;
+ int err;
+
+ xa_for_each_start(&devlink->ports, port_index, devlink_port,
+ state->idx) {
+ err = devlink_nl_port_resource_fill(msg, devlink_port,
+ cmd,
+ NETLINK_CB(cb->skb).portid,
+ cb->nlh->nlmsg_seq, flags);
+ if (err) {
+ state->idx = port_index;
+ return err;
+ }
+ }
+
+ return 0;
+}
+
+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);
+}
--
2.44.0
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