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Date: Sat, 3 Oct 2020 11:00:12 +0200
From: Jiri Pirko <jiri@...nulli.us>
To: Moshe Shemesh <moshe@...lanox.com>
Cc: "David S. Miller" <davem@...emloft.net>,
Jakub Kicinski <kuba@...nel.org>, Jiri Pirko <jiri@...dia.com>,
netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next 04/16] devlink: Add reload stats
Thu, Oct 01, 2020 at 03:59:07PM CEST, moshe@...lanox.com wrote:
>Add reload stats to hold the history per reload action type and limit.
>
>For example, the number of times fw_activate has been performed on this
>device since the driver module was added or if the firmware activation
>was performed with or without reset.
>
>Add devlink notification on stats update.
>
>Expose devlink reload stats to the user through devlink dev get command.
>
>Examples:
>$ devlink dev show
>pci/0000:82:00.0:
> stats:
> reload_stats:
> driver_reinit 2
> fw_activate 1
> fw_activate_no_reset 0
>pci/0000:82:00.1:
> stats:
> reload_stats:
> driver_reinit 1
> fw_activate 0
> fw_activate_no_reset 0
>
>$ devlink dev show -jp
>{
> "dev": {
> "pci/0000:82:00.0": {
> "stats": {
> "reload_stats": [ {
Just "reload". No need to repeat "stats" here.
> "driver_reinit": 2
> },{
> "fw_activate": 1
> },{
> "fw_activate_no_reset": 0
> } ]
> }
> },
> "pci/0000:82:00.1": {
> "stats": {
> "reload_stats": [ {
> "driver_reinit": 1
> },{
> "fw_activate": 0
> },{
> "fw_activate_no_reset": 0
> } ]
> }
> }
> }
>}
>
>Signed-off-by: Moshe Shemesh <moshe@...lanox.com>
>---
>RFCv5 -> v1:
>- Changed the stats output structure, have 2 stats, one for local and
>one for remote
>- Resplit this patch and the next one by remote/local reload stast
>instead of set/get reload stats
>- Add helper function devlink_reload_stats_put()
>RFCv4 -> RFCv5:
>- Add separate reload action stats for updating on remote actions
>- Protect from updating remote actions stats during reload_down()/up()
>RFCv3 -> RFCv4:
>- Renamed reload_actions_cnts to reload_action_stats
>- Add devlink notifications on stats update
>- Renamed devlink_reload_actions_implicit_actions_performed() and add
> function comment in code
>RFCv2 -> RFCv3:
>- New patch
>---
> include/net/devlink.h | 7 +++
> include/uapi/linux/devlink.h | 5 ++
> net/core/devlink.c | 97 ++++++++++++++++++++++++++++++++++++
> 3 files changed, 109 insertions(+)
>
>diff --git a/include/net/devlink.h b/include/net/devlink.h
>index 43dde69086e5..0f3bd23b6c04 100644
>--- a/include/net/devlink.h
>+++ b/include/net/devlink.h
>@@ -20,6 +20,9 @@
> #include <uapi/linux/devlink.h>
> #include <linux/xarray.h>
>
>+#define DEVLINK_RELOAD_STATS_ARRAY_SIZE \
>+ (__DEVLINK_RELOAD_LIMIT_MAX * __DEVLINK_RELOAD_ACTION_MAX)
>+
> struct devlink_ops;
>
> struct devlink {
>@@ -38,6 +41,7 @@ struct devlink {
> struct list_head trap_policer_list;
> const struct devlink_ops *ops;
> struct xarray snapshot_ids;
>+ u32 reload_stats[DEVLINK_RELOAD_STATS_ARRAY_SIZE];
> struct device *dev;
> possible_net_t _net;
> struct mutex lock; /* Serializes access to devlink instance specific objects such as
>@@ -1470,6 +1474,9 @@ void
> devlink_health_reporter_recovery_done(struct devlink_health_reporter *reporter);
>
> bool devlink_is_reload_failed(const struct devlink *devlink);
>+void devlink_remote_reload_actions_performed(struct devlink *devlink,
>+ enum devlink_reload_limit limit,
>+ unsigned long actions_performed);
Leftover, please remove/move.
>
> void devlink_flash_update_begin_notify(struct devlink *devlink);
> void devlink_flash_update_end_notify(struct devlink *devlink);
>diff --git a/include/uapi/linux/devlink.h b/include/uapi/linux/devlink.h
>index cc5dc4c07b4a..97e0137f6201 100644
>--- a/include/uapi/linux/devlink.h
>+++ b/include/uapi/linux/devlink.h
>@@ -526,6 +526,11 @@ enum devlink_attr {
> DEVLINK_ATTR_RELOAD_ACTIONS_PERFORMED, /* u64 */
> DEVLINK_ATTR_RELOAD_LIMIT, /* u8 */
>
>+ DEVLINK_ATTR_DEV_STATS, /* nested */
>+ DEVLINK_ATTR_RELOAD_STATS, /* nested */
>+ DEVLINK_ATTR_RELOAD_STATS_ENTRY, /* nested */
>+ DEVLINK_ATTR_RELOAD_STATS_VALUE, /* u32 */
>+
> /* 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 6de7d6aa6ed1..05516f1e4c3e 100644
>--- a/net/core/devlink.c
>+++ b/net/core/devlink.c
>@@ -500,10 +500,68 @@ devlink_reload_limit_is_supported(struct devlink *devlink, enum devlink_reload_l
> return test_bit(limit, &devlink->ops->reload_limits);
> }
>
>+static int devlink_reload_stat_put(struct sk_buff *msg, enum devlink_reload_action action,
>+ enum devlink_reload_limit limit, u32 value)
>+{
>+ struct nlattr *reload_stats_entry;
>+
>+ reload_stats_entry = nla_nest_start(msg, DEVLINK_ATTR_RELOAD_STATS_ENTRY);
>+ if (!reload_stats_entry)
>+ return -EMSGSIZE;
>+
>+ if (nla_put_u8(msg, DEVLINK_ATTR_RELOAD_ACTION, action))
>+ goto nla_put_failure;
>+ if (nla_put_u8(msg, DEVLINK_ATTR_RELOAD_LIMIT, limit))
>+ goto nla_put_failure;
>+ if (nla_put_u32(msg, DEVLINK_ATTR_RELOAD_STATS_VALUE, value))
>+ goto nla_put_failure;
>+ nla_nest_end(msg, reload_stats_entry);
>+ return 0;
>+
>+nla_put_failure:
>+ nla_nest_cancel(msg, reload_stats_entry);
>+ return -EMSGSIZE;
>+}
>+
>+static int devlink_reload_stats_put(struct sk_buff *msg, struct devlink *devlink)
>+{
>+ struct nlattr *reload_stats_attr;
>+ int i, j, stat_idx;
>+ u32 value;
>+
>+ reload_stats_attr = nla_nest_start(msg, DEVLINK_ATTR_RELOAD_STATS);
>+
>+ if (!reload_stats_attr)
>+ return -EMSGSIZE;
>+
>+ for (j = 0; j <= DEVLINK_RELOAD_LIMIT_MAX; j++) {
>+ if (j != DEVLINK_RELOAD_LIMIT_UNSPEC &&
You should check limit_unspec during driver register, not here.
>+ !devlink_reload_limit_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_stats[stat_idx];
>+ if (devlink_reload_stat_put(msg, i, j, value))
>+ goto nla_put_failure;
>+ }
>+ }
>+ nla_nest_end(msg, reload_stats_attr);
>+ return 0;
>+
>+nla_put_failure:
>+ nla_nest_cancel(msg, reload_stats_attr);
>+ 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;
> void *hdr;
>
> hdr = genlmsg_put(msg, portid, seq, &devlink_nl_family, flags, cmd);
>@@ -515,9 +573,19 @@ 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);
Avoid the "DEV". Just "DEVLINK_ATTR_STATS" is enough.
>+ if (!dev_stats)
>+ goto nla_put_failure;
>+
>+ if (devlink_reload_stats_put(msg, devlink))
>+ goto dev_stats_nest_cancel;
>+
>+ nla_nest_end(msg, dev_stats);
> genlmsg_end(msg, hdr);
> return 0;
>
>+dev_stats_nest_cancel:
>+ nla_nest_cancel(msg, dev_stats);
> nla_put_failure:
> genlmsg_cancel(msg, hdr);
> return -EMSGSIZE;
>@@ -3004,6 +3072,34 @@ bool devlink_is_reload_failed(const struct devlink *devlink)
> }
> EXPORT_SYMBOL_GPL(devlink_is_reload_failed);
>
>+static void
>+__devlink_reload_stats_update(struct devlink *devlink, u32 *reload_stats,
>+ enum devlink_reload_limit limit, unsigned long actions_performed)
>+{
>+ int stat_idx;
>+ int action;
>+
>+ if (!actions_performed)
>+ return;
>+
>+ if (WARN_ON(limit > DEVLINK_RELOAD_LIMIT_MAX))
I don't understand the reason for this check and warn on. You should
sanitize this in the caller (I think you already do that).
>+ return;
>+ for (action = 0; action <= DEVLINK_RELOAD_ACTION_MAX; action++) {
>+ if (!test_bit(action, &actions_performed))
>+ continue;
>+ stat_idx = limit * __DEVLINK_RELOAD_ACTION_MAX + action;
>+ reload_stats[stat_idx]++;
>+ }
>+ devlink_notify(devlink, DEVLINK_CMD_NEW);
>+}
>+
>+static void
>+devlink_reload_stats_update(struct devlink *devlink, enum devlink_reload_limit limit,
>+ unsigned long actions_performed)
>+{
>+ __devlink_reload_stats_update(devlink, devlink->reload_stats, limit, actions_performed);
>+}
>+
> static int devlink_reload(struct devlink *devlink, struct net *dest_net,
> enum devlink_reload_action action, enum devlink_reload_limit limit,
> struct netlink_ext_ack *extack, unsigned long *actions_performed)
>@@ -3026,6 +3122,7 @@ static int devlink_reload(struct devlink *devlink, struct net *dest_net,
> return err;
>
> WARN_ON(!test_bit(action, actions_performed));
>+ devlink_reload_stats_update(devlink, limit, *actions_performed);
> return 0;
> }
>
>--
>2.18.2
>
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