[PATCH net-next V4 05/12] devlink: Add dump support for device-level resources

Tariq Toukan
2026-04-01T18:51:40Z

Add dumpit handler for resource-dump command to iterate over all devlink
devices and show their resources.

$ devlink resource show
pci/0000:08:00.0:
name local_max_SFs size 508 unit entry
name external_max_SFs size 508 unit entry
pci/0000:08:00.1:
name local_max_SFs size 508 unit entry
name external_max_SFs size 508 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 | 6 +-
net/devlink/netlink_gen.c | 20 +++++-
net/devlink/netlink_gen.h | 4 +-
net/devlink/resource.c | 77 ++++++++++++++++++++++++
4 files changed, 102 insertions(+), 5 deletions(-)

diff --git a/Documentation/netlink/specs/devlink.yaml b/Documentation/netlink/specs/devlink.yaml
index b495d56b9137..c423e049c7bd 100644
--- a/Documentation/netlink/specs/devlink.yaml
+++ b/Documentation/netlink/specs/devlink.yaml
@@ -1764,13 +1764,17 @@ operations:
- bus-name
- dev-name
- index
- reply:
+ reply: &resource-dump-reply
value: 36
attributes:
- bus-name
- dev-name
- index
- resource-list
+ dump:
+ request:
+ attributes: *dev-id-attrs
+ reply: *resource-dump-reply

-
name: reload
diff --git a/net/devlink/netlink_gen.c b/net/devlink/netlink_gen.c
index eb35e80e01d1..a5a47a4c6de8 100644
--- a/net/devlink/netlink_gen.c
+++ b/net/devlink/netlink_gen.c
@@ -305,7 +305,14 @@ static const struct nla_policy devlink_resource_set_nl_policy[DEVLINK_ATTR_INDEX
};

/* DEVLINK_CMD_RESOURCE_DUMP - do */
-static const struct nla_policy devlink_resource_dump_nl_policy[DEVLINK_ATTR_INDEX + 1] = {
+static const struct nla_policy devlink_resource_dump_do_nl_policy[DEVLINK_ATTR_INDEX + 1] = {
+ [DEVLINK_ATTR_BUS_NAME] = { .type = NLA_NUL_STRING, },
+ [DEVLINK_ATTR_DEV_NAME] = { .type = NLA_NUL_STRING, },
+ [DEVLINK_ATTR_INDEX] = NLA_POLICY_FULL_RANGE(NLA_UINT, &devlink_attr_index_range),
+};
+
+/* DEVLINK_CMD_RESOURCE_DUMP - dump */
+static const struct nla_policy devlink_resource_dump_dump_nl_policy[DEVLINK_ATTR_INDEX + 1] = {
[DEVLINK_ATTR_BUS_NAME] = { .type = NLA_NUL_STRING, },
[DEVLINK_ATTR_DEV_NAME] = { .type = NLA_NUL_STRING, },
[DEVLINK_ATTR_INDEX] = NLA_POLICY_FULL_RANGE(NLA_UINT, &devlink_attr_index_range),
@@ -680,7 +687,7 @@ static const struct nla_policy devlink_notify_filter_set_nl_policy[DEVLINK_ATTR_
};

/* Ops table for devlink */
-const struct genl_split_ops devlink_nl_ops[74] = {
+const struct genl_split_ops devlink_nl_ops[75] = {
{
.cmd = DEVLINK_CMD_GET,
.validate = GENL_DONT_VALIDATE_STRICT,
@@ -958,10 +965,17 @@ const struct genl_split_ops devlink_nl_ops[74] = {
.pre_doit = devlink_nl_pre_doit,
.doit = devlink_nl_resource_dump_doit,
.post_doit = devlink_nl_post_doit,
- .policy = devlink_resource_dump_nl_policy,
+ .policy = devlink_resource_dump_do_nl_policy,
.maxattr = DEVLINK_ATTR_INDEX,
.flags = GENL_CMD_CAP_DO,
},
+ {
+ .cmd = DEVLINK_CMD_RESOURCE_DUMP,
+ .dumpit = devlink_nl_resource_dump_dumpit,
+ .policy = devlink_resource_dump_dump_nl_policy,
+ .maxattr = DEVLINK_ATTR_INDEX,
+ .flags = GENL_CMD_CAP_DUMP,
+ },
{
.cmd = DEVLINK_CMD_RELOAD,
.validate = GENL_DONT_VALIDATE_STRICT,
diff --git a/net/devlink/netlink_gen.h b/net/devlink/netlink_gen.h
index 2817d53a0eba..d79f6a0888f6 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[75];

int devlink_nl_pre_doit(const struct genl_split_ops *ops, struct sk_buff *skb,
struct genl_info *info);
@@ -80,6 +80,8 @@ int devlink_nl_dpipe_table_counters_set_doit(struct sk_buff *skb,
struct genl_info *info);
int devlink_nl_resource_set_doit(struct sk_buff *skb, struct genl_info *info);
int devlink_nl_resource_dump_doit(struct sk_buff *skb, struct genl_info *info);
+int devlink_nl_resource_dump_dumpit(struct sk_buff *skb,
+ struct netlink_callback *cb);
int devlink_nl_reload_doit(struct sk_buff *skb, struct genl_info *info);
int devlink_nl_param_get_doit(struct sk_buff *skb, struct genl_info *info);
int devlink_nl_param_get_dumpit(struct sk_buff *skb,
diff --git a/net/devlink/resource.c b/net/devlink/resource.c
index f3014ec425c4..02fb36e25c52 100644
--- a/net/devlink/resource.c
+++ b/net/devlink/resource.c
@@ -223,6 +223,31 @@ static int devlink_resource_put(struct devlink *devlink, struct sk_buff *skb,
return -EMSGSIZE;
}

+static int devlink_resource_list_fill(struct sk_buff *skb,
+ struct devlink *devlink,
+ struct list_head *resource_list_head,
+ int *idx)
+{
+ struct devlink_resource *resource;
+ int i = 0;
+ int err;
+
+ list_for_each_entry(resource, resource_list_head, list) {
+ if (i < *idx) {
+ i++;
+ continue;
+ }
+ err = devlink_resource_put(devlink, skb, resource);
+ if (err) {
+ *idx = i;
+ return err;
+ }
+ i++;
+ }
+ *idx = 0;
+ return 0;
+}
+
static int devlink_resource_fill(struct genl_info *info,
enum devlink_command cmd, int flags)
{
@@ -302,6 +327,58 @@ int devlink_nl_resource_dump_doit(struct sk_buff *skb, struct genl_info *info)
return devlink_resource_fill(info, DEVLINK_CMD_RESOURCE_DUMP, 0);
}

+static int
+devlink_nl_resource_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 nlattr *resources_attr;
+ int start_idx = state->idx;
+ void *hdr;
+ int err;
+
+ if (list_empty(&devlink->resource_list))
+ return 0;
+
+ err = -EMSGSIZE;
+ hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
+ &devlink_nl_family, flags, DEVLINK_CMD_RESOURCE_DUMP);
+ if (!hdr)
+ return err;
+
+ if (devlink_nl_put_handle(skb, devlink))
+ goto nla_put_failure;
+
+ resources_attr = nla_nest_start_noflag(skb, DEVLINK_ATTR_RESOURCE_LIST);
+ if (!resources_attr)
+ goto nla_put_failure;
+
+ err = devlink_resource_list_fill(skb, devlink,
+ &devlink->resource_list, &state->idx);
+ if (err) {
+ if (state->idx == start_idx)
+ goto resource_list_cancel;
+ nla_nest_end(skb, resources_attr);
+ genlmsg_end(skb, hdr);
+ return err;
+ }
+ nla_nest_end(skb, resources_attr);
+ genlmsg_end(skb, hdr);
+ return 0;
+
+resource_list_cancel:
+ nla_nest_cancel(skb, resources_attr);
+nla_put_failure:
+ genlmsg_cancel(skb, hdr);
+ return err;
+}
+
+int devlink_nl_resource_dump_dumpit(struct sk_buff *skb,
+ struct netlink_callback *cb)
+{
+ return devlink_nl_dumpit(skb, cb, devlink_nl_resource_dump_one);
+}
+
int devlink_resources_validate(struct devlink *devlink,
struct devlink_resource *resource,
struct genl_info *info)
--
2.44.0