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net: devlink: introduce nested devlink entity for line card

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For the purpose of exposing device info and allow flash update which is
going to be implemented in follow-up patches, introduce a possibility
for a line card to expose relation to nested devlink entity. The nested
devlink entity represents the line card.

Example:

$ devlink lc show pci/0000:01:00.0 lc 1
pci/0000:01:00.0:
  lc 1 state active type 16x100G nested_devlink auxiliary/mlxsw_core.lc.0
    supported_types:
       16x100G
$ devlink dev show auxiliary/mlxsw_core.lc.0
auxiliary/mlxsw_core.lc.0

Signed-off-by: Jiri Pirko <jiri@nvidia.com>
Acked-by: Jakub Kicinski <kuba@kernel.org>
Reviewed-by: Ido Schimmel <idosch@nvidia.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Jiri Pirko 2022-07-25 10:29:16 +02:00 committed by Jakub Kicinski
parent 294c4f57cf
commit 7b2d9a1a50
3 changed files with 46 additions and 0 deletions
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2
include/net/devlink.h
View file

@ -1580,6 +1580,8 @@ void devlink_linecard_provision_clear(struct devlink_linecard *linecard);
void devlink_linecard_provision_fail(struct devlink_linecard *linecard);
void devlink_linecard_activate(struct devlink_linecard *linecard);
void devlink_linecard_deactivate(struct devlink_linecard *linecard);
void devlink_linecard_nested_dl_set(struct devlink_linecard *linecard,
struct devlink *nested_devlink);
int devl_sb_register(struct devlink *devlink, unsigned int sb_index,
u32 size, u16 ingress_pools_count,
u16 egress_pools_count, u16 ingress_tc_count,

2
include/uapi/linux/devlink.h
View file

@ -576,6 +576,8 @@ enum devlink_attr {
DEVLINK_ATTR_LINECARD_TYPE, /* string */
DEVLINK_ATTR_LINECARD_SUPPORTED_TYPES, /* nested */
DEVLINK_ATTR_NESTED_DEVLINK, /* nested */
/* add new attributes above here, update the policy in devlink.c */
__DEVLINK_ATTR_MAX,

42
net/core/devlink.c
View file

@ -89,6 +89,7 @@ struct devlink_linecard {
const char *type;
struct devlink_linecard_type *types;
unsigned int types_count;
struct devlink *nested_devlink;
};
/**
@ -856,6 +857,24 @@ static int devlink_nl_put_handle(struct sk_buff *msg, struct devlink *devlink)
return 0;
}
static int devlink_nl_put_nested_handle(struct sk_buff *msg, struct devlink *devlink)
{
struct nlattr *nested_attr;
nested_attr = nla_nest_start(msg, DEVLINK_ATTR_NESTED_DEVLINK);
if (!nested_attr)
return -EMSGSIZE;
if (devlink_nl_put_handle(msg, devlink))
goto nla_put_failure;
nla_nest_end(msg, nested_attr);
return 0;
nla_put_failure:
nla_nest_cancel(msg, nested_attr);
return -EMSGSIZE;
}
struct devlink_reload_combination {
enum devlink_reload_action action;
enum devlink_reload_limit limit;
@ -2135,6 +2154,10 @@ static int devlink_nl_linecard_fill(struct sk_buff *msg,
nla_nest_end(msg, attr);
}
if (linecard->nested_devlink &&
devlink_nl_put_nested_handle(msg, linecard->nested_devlink))
goto nla_put_failure;
genlmsg_end(msg, hdr);
return 0;
@ -10255,6 +10278,7 @@ EXPORT_SYMBOL_GPL(devlink_linecard_provision_set);
void devlink_linecard_provision_clear(struct devlink_linecard *linecard)
{
mutex_lock(&linecard->state_lock);
WARN_ON(linecard->nested_devlink);
linecard->state = DEVLINK_LINECARD_STATE_UNPROVISIONED;
linecard->type = NULL;
devlink_linecard_notify(linecard, DEVLINK_CMD_LINECARD_NEW);
@ -10273,6 +10297,7 @@ EXPORT_SYMBOL_GPL(devlink_linecard_provision_clear);
void devlink_linecard_provision_fail(struct devlink_linecard *linecard)
{
mutex_lock(&linecard->state_lock);
WARN_ON(linecard->nested_devlink);
linecard->state = DEVLINK_LINECARD_STATE_PROVISIONING_FAILED;
devlink_linecard_notify(linecard, DEVLINK_CMD_LINECARD_NEW);
mutex_unlock(&linecard->state_lock);
@ -10320,6 +10345,23 @@ void devlink_linecard_deactivate(struct devlink_linecard *linecard)
}
EXPORT_SYMBOL_GPL(devlink_linecard_deactivate);
/**
* devlink_linecard_nested_dl_set - Attach/detach nested devlink
* instance to linecard.
*
* @linecard: devlink linecard
* @nested_devlink: devlink instance to attach or NULL to detach
*/
void devlink_linecard_nested_dl_set(struct devlink_linecard *linecard,
struct devlink *nested_devlink)
{
mutex_lock(&linecard->state_lock);
linecard->nested_devlink = nested_devlink;
devlink_linecard_notify(linecard, DEVLINK_CMD_LINECARD_NEW);
mutex_unlock(&linecard->state_lock);
}
EXPORT_SYMBOL_GPL(devlink_linecard_nested_dl_set);
int devl_sb_register(struct devlink *devlink, unsigned int sb_index,
u32 size, u16 ingress_pools_count,
u16 egress_pools_count, u16 ingress_tc_count,