linux-kernel - Re: [PATCH net-next RFC v3 02/14] devlink: Add reload actions counters

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Date:   Mon, 31 Aug 2020 12:48:27 +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@...lanox.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next RFC v3 02/14] devlink: Add reload actions
 counters

Sun, Aug 30, 2020 at 05:27:22PM CEST, moshe@...lanox.com wrote:
>Add reload actions counters to hold the history per reload action type.
>For example, the number of times fw_activate has been done on this
>device since the driver module was added or if the firmware activation
>was done with or without reset.
>The function devlink_reload_actions_cnts_update() is exported to enable
>also drivers update on reload actions done, for example in case firmware
>activation with reset finished successfully but was initiated by remote
>host.
>
>Signed-off-by: Moshe Shemesh <moshe@...lanox.com>
>---
>v2 -> v3:
>- New patch
>---
> include/net/devlink.h |  2 ++
> net/core/devlink.c    | 24 +++++++++++++++++++++---
> 2 files changed, 23 insertions(+), 3 deletions(-)
>
>diff --git a/include/net/devlink.h b/include/net/devlink.h
>index b8f0152a1fff..0547f0707d92 100644
>--- a/include/net/devlink.h
>+++ b/include/net/devlink.h
>@@ -38,6 +38,7 @@ struct devlink {
> 	struct list_head trap_policer_list;
> 	const struct devlink_ops *ops;
> 	struct xarray snapshot_ids;
>+	u32 reload_actions_cnts[DEVLINK_RELOAD_ACTION_MAX];
> 	struct device *dev;
> 	possible_net_t _net;
> 	struct mutex lock; /* Serializes access to devlink instance specific objects such as
>@@ -1372,6 +1373,7 @@ void
> devlink_health_reporter_recovery_done(struct devlink_health_reporter *reporter);
> 
> bool devlink_is_reload_failed(const struct devlink *devlink);
>+void devlink_reload_actions_cnts_update(struct devlink *devlink, unsigned long actions_done);
> 
> void devlink_flash_update_begin_notify(struct devlink *devlink);
> void devlink_flash_update_end_notify(struct devlink *devlink);
>diff --git a/net/core/devlink.c b/net/core/devlink.c
>index 8d4137ad40db..20a29c34ff71 100644
>--- a/net/core/devlink.c
>+++ b/net/core/devlink.c
>@@ -2969,10 +2969,23 @@ bool devlink_is_reload_failed(const struct devlink *devlink)
> }
> EXPORT_SYMBOL_GPL(devlink_is_reload_failed);
> 
>+void devlink_reload_actions_cnts_update(struct devlink *devlink, unsigned long actions_done)
>+{
>+	int action;
>+
>+	for (action = 0; action < DEVLINK_RELOAD_ACTION_MAX; action++) {
>+		if (!test_bit(action, &actions_done))
>+			continue;
>+		devlink->reload_actions_cnts[action]++;
>+	}
>+}
>+EXPORT_SYMBOL_GPL(devlink_reload_actions_cnts_update);

I don't follow why this is an exported symbol if you only use it from
this .c. Looks like a leftover...


>+
> static int devlink_reload(struct devlink *devlink, struct net *dest_net,
> 			  enum devlink_reload_action action, struct netlink_ext_ack *extack,
>-			  unsigned long *actions_done)
>+			  unsigned long *actions_done_out)
> {
>+	unsigned long actions_done;
> 	int err;
> 
> 	if (!devlink->reload_enabled)
>@@ -2985,9 +2998,14 @@ static int devlink_reload(struct devlink *devlink, struct net *dest_net,
> 	if (dest_net && !net_eq(dest_net, devlink_net(devlink)))
> 		devlink_reload_netns_change(devlink, dest_net);
> 
>-	err = devlink->ops->reload_up(devlink, action, extack, actions_done);
>+	err = devlink->ops->reload_up(devlink, action, extack, &actions_done);
> 	devlink_reload_failed_set(devlink, !!err);
>-	return err;
>+	if (err)
>+		return err;
>+	devlink_reload_actions_cnts_update(devlink, actions_done);
>+	if (actions_done_out)
>+		*actions_done_out = actions_done;

Why don't you just use the original actions_done directly without having
extra local variable?


>+	return 0;
> }
> 
> static int
>-- 
>2.17.1
>