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Subject[PATCH net-next RFC v5 04/15] devlink: Add reload actions stats to dev get
Date
Expose devlink reload actions stats to the user through devlink dev
get command.

Examples:
$ devlink dev show
pci/0000:82:00.0:
stats:
reload_action_stats:
driver_reinit 2
fw_activate 1
fw_activate_no_reset 0
remote_driver_reinit 0
remote_fw_activate 0
remote_fw_activate_no_reset 0
pci/0000:82:00.1:
stats:
reload_action_stats:
driver_reinit 0
fw_activate 0
fw_activate_no_reset 0
remote_driver_reinit 1
remote_fw_activate 1
remote_fw_activate_no_reset 0

$ devlink dev show -jp
{
"dev": {
"pci/0000:82:00.0": {
"stats": {
"reload_action_stats": [ {
"driver_reinit": 2
},{
"fw_activate": 1
},{
"fw_activate_no_reset": 0
},{
"remote_driver_reinit": 0
},{
"remote_fw_activate": 0
},{
"remote_fw_activate_no_reset": 0
} ]
}
},
"pci/0000:82:00.1": {
"stats": {
"reload_action_stats": [ {
"driver_reinit": 0
},{
"fw_activate": 0
},{
"fw_activate_no_reset": 0
},{
"remote_driver_reinit": 1
},{
"remote_fw_activate": 1
},{
"remote_fw_activate_no_reset": 0
} ]
}
}
}
}

Signed-off-by: Moshe Shemesh <moshe@mellanox.com>
---
v4 -> v5:
- Add remote actions stats
- If devlink reload is not supported, show only remote_stats
v3 -> v4:
- Renamed DEVLINK_ATTR_RELOAD_ACTION_CNT to
DEVLINK_ATTR_RELOAD_ACTION_STAT
- Add stats per action per limit level
v2 -> v3:
- Add reload actions counters instead of supported reload actions
(reload actions counters are only for supported action so no need for
both)
v1 -> v2:
- Removed DEVLINK_ATTR_RELOAD_DEFAULT_LEVEL
- Removed DEVLINK_ATTR_RELOAD_LEVELS_INFO
- Have actions instead of levels
---
include/uapi/linux/devlink.h | 5 +++
net/core/devlink.c | 70 ++++++++++++++++++++++++++++++++++++
2 files changed, 75 insertions(+)

diff --git a/include/uapi/linux/devlink.h b/include/uapi/linux/devlink.h
index 0c5d942dcbd5..648d53be691e 100644
--- a/include/uapi/linux/devlink.h
+++ b/include/uapi/linux/devlink.h
@@ -497,7 +497,12 @@ enum devlink_attr {
DEVLINK_ATTR_RELOAD_ACTION, /* u8 */
DEVLINK_ATTR_RELOAD_ACTIONS_PERFORMED, /* nested */
DEVLINK_ATTR_RELOAD_ACTION_LIMIT_LEVEL, /* u8 */
+ DEVLINK_ATTR_RELOAD_ACTION_STATS, /* nested */
+ DEVLINK_ATTR_RELOAD_ACTION_STAT, /* nested */
+ DEVLINK_ATTR_RELOAD_ACTION_STAT_REMOTE, /* flag */
+ DEVLINK_ATTR_RELOAD_ACTION_STAT_VALUE, /* u32 */

+ DEVLINK_ATTR_DEV_STATS, /* nested */
/* add new attributes above here, update the policy in devlink.c */

__DEVLINK_ATTR_MAX,
diff --git a/net/core/devlink.c b/net/core/devlink.c
index 1509c2ffb98b..71aeda259e6a 100644
--- a/net/core/devlink.c
+++ b/net/core/devlink.c
@@ -501,10 +501,39 @@ devlink_reload_action_limit_level_is_supported(struct devlink *devlink,
return test_bit(limit_level, &devlink->ops->supported_reload_action_limit_levels);
}

+static int devlink_reload_action_stat_put(struct sk_buff *msg, enum devlink_reload_action action,
+ enum devlink_reload_action_limit_level limit_level,
+ bool is_remote, u32 value)
+{
+ struct nlattr *reload_action_stat;
+
+ reload_action_stat = nla_nest_start(msg, DEVLINK_ATTR_RELOAD_ACTION_STAT);
+ if (!reload_action_stat)
+ return -EMSGSIZE;
+
+ if (nla_put_u8(msg, DEVLINK_ATTR_RELOAD_ACTION, action))
+ goto nla_put_failure;
+ if (nla_put_u8(msg, DEVLINK_ATTR_RELOAD_ACTION_LIMIT_LEVEL, limit_level))
+ goto nla_put_failure;
+ if (is_remote && nla_put_flag(msg, DEVLINK_ATTR_RELOAD_ACTION_STAT_REMOTE))
+ goto nla_put_failure;
+ if (nla_put_u32(msg, DEVLINK_ATTR_RELOAD_ACTION_STAT_VALUE, value))
+ goto nla_put_failure;
+ nla_nest_end(msg, reload_action_stat);
+ return 0;
+
+nla_put_failure:
+ nla_nest_cancel(msg, reload_action_stat);
+ return -EMSGSIZE;
+}
+
static int devlink_nl_fill(struct sk_buff *msg, struct devlink *devlink,
enum devlink_command cmd, u32 portid,
u32 seq, int flags)
{
+ struct nlattr *dev_stats, *reload_action_stats;
+ int i, j, stat_idx;
+ u32 value;
void *hdr;

hdr = genlmsg_put(msg, portid, seq, &devlink_nl_family, flags, cmd);
@@ -516,9 +545,50 @@ static int devlink_nl_fill(struct sk_buff *msg, struct devlink *devlink,
if (nla_put_u8(msg, DEVLINK_ATTR_RELOAD_FAILED, devlink->reload_failed))
goto nla_put_failure;

+ dev_stats = nla_nest_start(msg, DEVLINK_ATTR_DEV_STATS);
+ if (!dev_stats)
+ goto nla_put_failure;
+ reload_action_stats = nla_nest_start(msg, DEVLINK_ATTR_RELOAD_ACTION_STATS);
+ if (!reload_action_stats)
+ goto dev_stats_nest_cancel;
+
+ for (j = 0; j <= DEVLINK_RELOAD_ACTION_LIMIT_LEVEL_MAX; j++) {
+ if (!devlink_reload_action_limit_level_is_supported(devlink, j))
+ continue;
+ for (i = 0; i <= DEVLINK_RELOAD_ACTION_MAX; i++) {
+ if (!devlink_reload_action_is_supported(devlink, i) ||
+ devlink_reload_combination_is_invalid(i, j))
+ continue;
+
+ stat_idx = j * __DEVLINK_RELOAD_ACTION_MAX + i;
+ value = devlink->reload_action_stats[stat_idx];
+ if (devlink_reload_action_stat_put(msg, i, j, false, value))
+ goto reload_action_stats_nest_cancel;
+ }
+ }
+
+ for (j = 0; j <= DEVLINK_RELOAD_ACTION_LIMIT_LEVEL_MAX; j++) {
+ for (i = 0; i <= DEVLINK_RELOAD_ACTION_MAX; i++) {
+ if (i == DEVLINK_RELOAD_ACTION_UNSPEC ||
+ devlink_reload_combination_is_invalid(i, j))
+ continue;
+
+ stat_idx = j * __DEVLINK_RELOAD_ACTION_MAX + i;
+ value = devlink->remote_reload_action_stats[stat_idx];
+ if (devlink_reload_action_stat_put(msg, i, j, true, value))
+ goto reload_action_stats_nest_cancel;
+ }
+ }
+
+ nla_nest_end(msg, reload_action_stats);
+ nla_nest_end(msg, dev_stats);
genlmsg_end(msg, hdr);
return 0;

+dev_stats_nest_cancel:
+ nla_nest_cancel(msg, dev_stats);
+reload_action_stats_nest_cancel:
+ nla_nest_cancel(msg, reload_action_stats);
nla_put_failure:
genlmsg_cancel(msg, hdr);
return -EMSGSIZE;
--
2.17.1
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