netdev - Re: [patch net-next 3/4] mlxsw: Add interface to access registers and process events

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Date:	Fri, 24 Jul 2015 07:24:53 +0200
From:	Jiri Pirko <jiri@...nulli.us>
To:	Andy Gospodarek <gospo@...ulusnetworks.com>
Cc:	netdev@...r.kernel.org, davem@...emloft.net, idosch@...lanox.com,
	eladr@...lanox.com, ogerlitz@...lanox.com, sfeldma@...il.com,
	roopa@...ulusnetworks.com, f.fainelli@...il.com, tgraf@...g.ch,
	ast@...mgrid.com, jhs@...atatu.com, daniel@...earbox.net,
	john.fastabend@...il.com, simon.horman@...ronome.com,
	linville@...driver.com, andy@...yhouse.net,
	shm@...ulusnetworks.com, nhorman@...driver.com,
	Jiri Pirko <jiri@...lanox.com>
Subject: Re: [patch net-next 3/4] mlxsw: Add interface to access registers
 and process events

Thu, Jul 23, 2015 at 11:12:20PM CEST, gospo@...ulusnetworks.com wrote:
>On Thu, Jul 23, 2015 at 05:43:35PM +0200, Jiri Pirko wrote:
>> From: Ido Schimmel <idosch@...lanox.com>
>> 
>> Add the ability to construct mailbox-style register access messages
>> called EMADs with provisions to construct and parse the registers payload.
>> Implement EMAD transaction layer which is responsible for the reliable
>> transmission of EMADs.
>> Also, add an infrastructure used by the switch driver to register for
>> particular events generated by the device.
>> 
>> Signed-off-by: Ido Schimmel <idosch@...lanox.com>
>> Signed-off-by: Jiri Pirko <jiri@...lanox.com>
>> Signed-off-by: Elad Raz <eladr@...lanox.com>
>> ---
>>  drivers/net/ethernet/mellanox/mlxsw/core.c |  736 ++++++++++++++++
>>  drivers/net/ethernet/mellanox/mlxsw/core.h |   21 +
>>  drivers/net/ethernet/mellanox/mlxsw/emad.h |  127 +++
>>  drivers/net/ethernet/mellanox/mlxsw/port.h |   19 +
>>  drivers/net/ethernet/mellanox/mlxsw/reg.h  | 1289 ++++++++++++++++++++++++++++
>>  5 files changed, 2192 insertions(+)
>>  create mode 100644 drivers/net/ethernet/mellanox/mlxsw/emad.h
>>  create mode 100644 drivers/net/ethernet/mellanox/mlxsw/reg.h
>> 
>> diff --git a/drivers/net/ethernet/mellanox/mlxsw/core.c b/drivers/net/ethernet/mellanox/mlxsw/core.c
>> index 211ec9b..bd0f692 100644
>> --- a/drivers/net/ethernet/mellanox/mlxsw/core.c
>> +++ b/drivers/net/ethernet/mellanox/mlxsw/core.c
>[...]
>> +	struct list_head event_listener_list;
>> +	struct {
>> +		struct sk_buff *resp_skb;
>> +		u64 tid;
>> +		wait_queue_head_t wait;
>> +		bool trans_active;
>> +		struct mutex lock; /* One EMAD transaction at a time. */
>> +		bool use_emad;
>> +	} emad;
>>  	struct mlxsw_core_pcpu_stats __percpu *pcpu_stats;
>>  	struct dentry *dbg_dir;
>>  	struct {
>[...]
>>  	}
>>  
>>  	INIT_LIST_HEAD(&mlxsw_core->rx_listener_list);
>> +	INIT_LIST_HEAD(&mlxsw_core->event_listener_list);
>>  	mlxsw_core->driver = mlxsw_driver;
>>  	mlxsw_core->bus = mlxsw_bus;
>>  	mlxsw_core->bus_priv = bus_priv;
>[...]
>> +	/* No reason to save item if we did not manage to register an RX
>> +	 * listener for it.
>> +	 */
>> +	list_add_rcu(&el_item->list, &mlxsw_core->event_listener_list);
>> +
>
>I see where 'event_listener_list' is defined and where entries are
>added/removed, but where is the code that would receive these events and
>presumably search this list so all handlers registered (currently just
>PUDE) can handle events?

That is handled by calling mlxsw_core_rx_listener_register.
that will add each event handler as a item to &mlxsw_core->rx_listener_list
These rx_listeners are called from mlxsw_core_skb_receive.
So event is here a special case of rx_listener. The event list is used
just to contain struct mlxsw_event_listener_item instances.

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