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devlink: define enum for attr types of dynamic attributes

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Devlink param and health reporter fmsg use attributes with dynamic type
which is determined according to a different type. Currently used values
are NLA_*. The problem is, they are not part of UAPI. They may change
which would cause a break.

To make this future safe, introduce a enum that shadows NLA_* values in
it and is part of UAPI.

Also, this allows to possibly carry types that are unrelated to NLA_*
values.

Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
Signed-off-by: Jiri Pirko <jiri@nvidia.com>
Link: https://patch.msgid.link/20250505114513.53370-3-jiri@resnulli.us
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Jiri Pirko 2025-05-05 13:45:11 +02:00 • committed by Jakub Kicinski
parent 37006af675
commit 429ac62114
5 changed files with 97 additions and 18 deletions
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24
Documentation/netlink/specs/devlink.yaml
View file

@ -202,6 +202,28 @@ definitions:
name: exception
-
name: control
-
type: enum
name: var-attr-type
entries:
-
name: u8
value: 1
-
name: u16
-
name: u32
-
name: u64
-
name: string
-
name: flag
-
name: nul_string
value: 10
-
name: binary
attribute-sets:
-
@ -498,6 +520,7 @@ attribute-sets:
-
name: param-type
type: u8
enum: var-attr-type
# TODO: fill in the attributes in between
@ -592,6 +615,7 @@ attribute-sets:
-
name: fmsg-obj-value-type
type: u8
enum: var-attr-type
# TODO: fill in the attributes in between

15
include/uapi/linux/devlink.h
View file

@ -385,6 +385,21 @@ enum devlink_linecard_state {
DEVLINK_LINECARD_STATE_MAX = __DEVLINK_LINECARD_STATE_MAX - 1
};
/* Variable attribute type. */
enum devlink_var_attr_type {
/* Following values relate to the internal NLA_* values */
DEVLINK_VAR_ATTR_TYPE_U8 = 1,
DEVLINK_VAR_ATTR_TYPE_U16,
DEVLINK_VAR_ATTR_TYPE_U32,
DEVLINK_VAR_ATTR_TYPE_U64,
DEVLINK_VAR_ATTR_TYPE_STRING,
DEVLINK_VAR_ATTR_TYPE_FLAG,
DEVLINK_VAR_ATTR_TYPE_NUL_STRING = 10,
DEVLINK_VAR_ATTR_TYPE_BINARY,
__DEVLINK_VAR_ATTR_TYPE_CUSTOM_BASE = 0x80,
/* Any possible custom types, unrelated to NLA_* values go below */
};
enum devlink_attr {
/* don't change the order or add anything between, this is ABI! */
DEVLINK_ATTR_UNSPEC,

17
net/devlink/health.c
View file

@ -930,18 +930,31 @@ EXPORT_SYMBOL_GPL(devlink_fmsg_binary_pair_put);
static int
devlink_fmsg_item_fill_type(struct devlink_fmsg_item *msg, struct sk_buff *skb)
{
enum devlink_var_attr_type var_attr_type;
switch (msg->nla_type) {
case NLA_FLAG:
var_attr_type = DEVLINK_VAR_ATTR_TYPE_FLAG;
break;
case NLA_U8:
var_attr_type = DEVLINK_VAR_ATTR_TYPE_U8;
break;
case NLA_U32:
var_attr_type = DEVLINK_VAR_ATTR_TYPE_U32;
break;
case NLA_U64:
var_attr_type = DEVLINK_VAR_ATTR_TYPE_U64;
break;
case NLA_NUL_STRING:
var_attr_type = DEVLINK_VAR_ATTR_TYPE_NUL_STRING;
break;
case NLA_BINARY:
return nla_put_u8(skb, DEVLINK_ATTR_FMSG_OBJ_VALUE_TYPE,
msg->nla_type);
var_attr_type = DEVLINK_VAR_ATTR_TYPE_BINARY;
break;
default:
return -EINVAL;
}
return nla_put_u8(skb, DEVLINK_ATTR_FMSG_OBJ_VALUE_TYPE, var_attr_type);
}
static int

29
net/devlink/netlink_gen.c
View file

@ -10,6 +10,33 @@
#include <uapi/linux/devlink.h>
/* Sparse enums validation callbacks */
static int
devlink_attr_param_type_validate(const struct nlattr *attr,
struct netlink_ext_ack *extack)
{
switch (nla_get_u8(attr)) {
case DEVLINK_VAR_ATTR_TYPE_U8:
fallthrough;
case DEVLINK_VAR_ATTR_TYPE_U16:
fallthrough;
case DEVLINK_VAR_ATTR_TYPE_U32:
fallthrough;
case DEVLINK_VAR_ATTR_TYPE_U64:
fallthrough;
case DEVLINK_VAR_ATTR_TYPE_STRING:
fallthrough;
case DEVLINK_VAR_ATTR_TYPE_FLAG:
fallthrough;
case DEVLINK_VAR_ATTR_TYPE_NUL_STRING:
fallthrough;
case DEVLINK_VAR_ATTR_TYPE_BINARY:
return 0;
}
NL_SET_ERR_MSG_ATTR(extack, attr, "invalid enum value");
return -EINVAL;
}
/* Common nested types */
const struct nla_policy devlink_dl_port_function_nl_policy[DEVLINK_PORT_FN_ATTR_CAPS + 1] = {
[DEVLINK_PORT_FUNCTION_ATTR_HW_ADDR] = { .type = NLA_BINARY, },
@ -273,7 +300,7 @@ static const struct nla_policy devlink_param_set_nl_policy[DEVLINK_ATTR_PARAM_VA
[DEVLINK_ATTR_BUS_NAME] = { .type = NLA_NUL_STRING, },
[DEVLINK_ATTR_DEV_NAME] = { .type = NLA_NUL_STRING, },
[DEVLINK_ATTR_PARAM_NAME] = { .type = NLA_NUL_STRING, },
[DEVLINK_ATTR_PARAM_TYPE] = { .type = NLA_U8, },
[DEVLINK_ATTR_PARAM_TYPE] = NLA_POLICY_VALIDATE_FN(NLA_U8, &devlink_attr_param_type_validate),
[DEVLINK_ATTR_PARAM_VALUE_CMODE] = NLA_POLICY_MAX(NLA_U8, 2),
};

30
net/devlink/param.c
View file

@ -167,19 +167,19 @@ static int devlink_param_set(struct devlink *devlink,
}
static int
devlink_param_type_to_nla_type(enum devlink_param_type param_type)
devlink_param_type_to_var_attr_type(enum devlink_param_type param_type)
{
switch (param_type) {
case DEVLINK_PARAM_TYPE_U8:
return NLA_U8;
return DEVLINK_VAR_ATTR_TYPE_U8;
case DEVLINK_PARAM_TYPE_U16:
return NLA_U16;
return DEVLINK_VAR_ATTR_TYPE_U16;
case DEVLINK_PARAM_TYPE_U32:
return NLA_U32;
return DEVLINK_VAR_ATTR_TYPE_U32;
case DEVLINK_PARAM_TYPE_STRING:
return NLA_STRING;
return DEVLINK_VAR_ATTR_TYPE_STRING;
case DEVLINK_PARAM_TYPE_BOOL:
return NLA_FLAG;
return DEVLINK_VAR_ATTR_TYPE_FLAG;
default:
return -EINVAL;
}
@ -247,7 +247,7 @@ static int devlink_nl_param_fill(struct sk_buff *msg, struct devlink *devlink,
struct devlink_param_gset_ctx ctx;
struct nlattr *param_values_list;
struct nlattr *param_attr;
int nla_type;
int var_attr_type;
void *hdr;
int err;
int i;
@ -294,10 +294,10 @@ static int devlink_nl_param_fill(struct sk_buff *msg, struct devlink *devlink,
if (param->generic && nla_put_flag(msg, DEVLINK_ATTR_PARAM_GENERIC))
goto param_nest_cancel;
nla_type = devlink_param_type_to_nla_type(param->type);
if (nla_type < 0)
var_attr_type = devlink_param_type_to_var_attr_type(param->type);
if (var_attr_type < 0)
goto param_nest_cancel;
if (nla_put_u8(msg, DEVLINK_ATTR_PARAM_TYPE, nla_type))
if (nla_put_u8(msg, DEVLINK_ATTR_PARAM_TYPE, var_attr_type))
goto param_nest_cancel;
param_values_list = nla_nest_start_noflag(msg,
@ -420,19 +420,19 @@ devlink_param_type_get_from_info(struct genl_info *info,
return -EINVAL;
switch (nla_get_u8(info->attrs[DEVLINK_ATTR_PARAM_TYPE])) {
case NLA_U8:
case DEVLINK_VAR_ATTR_TYPE_U8:
*param_type = DEVLINK_PARAM_TYPE_U8;
break;
case NLA_U16:
case DEVLINK_VAR_ATTR_TYPE_U16:
*param_type = DEVLINK_PARAM_TYPE_U16;
break;
case NLA_U32:
case DEVLINK_VAR_ATTR_TYPE_U32:
*param_type = DEVLINK_PARAM_TYPE_U32;
break;
case NLA_STRING:
case DEVLINK_VAR_ATTR_TYPE_STRING:
*param_type = DEVLINK_PARAM_TYPE_STRING;
break;
case NLA_FLAG:
case DEVLINK_VAR_ATTR_TYPE_FLAG:
*param_type = DEVLINK_PARAM_TYPE_BOOL;
break;
default: