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

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Date:   Tue, 1 Sep 2020 22:05:36 +0300
From:   Moshe Shemesh <moshe@...dia.com>
To:     Jiri Pirko <jiri@...nulli.us>, 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


On 8/31/2020 1:48 PM, Jiri Pirko wrote:
> 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...
>
Not leftover, in the commit message I notified and explained why I 
exposed it.
>> +
>> 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?

Because the parameter can be NULL if not needed, see patch 01/14 
devlink_reload() called from devlink_pernet_pre_exit()


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