netdev - Re: [patch net-next v4 6/7] rocker: remove nowait from switchdev callbacks.

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Date:	Mon, 12 Oct 2015 23:55:11 -0700
From:	Scott Feldman <sfeldma@...il.com>
To:	Jiri Pirko <jiri@...nulli.us>
Cc:	Netdev <netdev@...r.kernel.org>,
	"David S. Miller" <davem@...emloft.net>,
	Ido Schimmel <idosch@...lanox.com>,
	Elad Raz <eladr@...lanox.com>,
	Florian Fainelli <f.fainelli@...il.com>,
	Guenter Roeck <linux@...ck-us.net>,
	Vivien Didelot <vivien.didelot@...oirfairelinux.com>,
	"andrew@...n.ch" <andrew@...n.ch>,
	john fastabend <john.fastabend@...il.com>,
	David Laight <David.Laight@...lab.com>,
	"stephen@...workplumber.org" <stephen@...workplumber.org>
Subject: Re: [patch net-next v4 6/7] rocker: remove nowait from switchdev callbacks.

On Mon, Oct 12, 2015 at 11:25 PM, Jiri Pirko <jiri@...nulli.us> wrote:
> Tue, Oct 13, 2015 at 06:02:28AM CEST, sfeldma@...il.com wrote:
>>On Mon, Oct 12, 2015 at 11:03 AM, Jiri Pirko <jiri@...nulli.us> wrote:
>>> From: Jiri Pirko <jiri@...lanox.com>
>>>
>>> No need to avoid sleeping in switchdev callbacks now, as the switchdev
>>> core allows it.
>>>
>>> Signed-off-by: Jiri Pirko <jiri@...lanox.com>
>>> ---
>>>  drivers/net/ethernet/rocker/rocker.c | 7 +++----
>>>  1 file changed, 3 insertions(+), 4 deletions(-)
>>>
>>> diff --git a/drivers/net/ethernet/rocker/rocker.c b/drivers/net/ethernet/rocker/rocker.c
>>> index bb956a5..9629c5b5 100644
>>> --- a/drivers/net/ethernet/rocker/rocker.c
>>> +++ b/drivers/net/ethernet/rocker/rocker.c
>>> @@ -3672,7 +3672,7 @@ static int rocker_port_fdb_flush(struct rocker_port *rocker_port,
>>>             rocker_port->stp_state == BR_STATE_FORWARDING)
>>>                 return 0;
>>>
>>> -       flags |= ROCKER_OP_FLAG_REMOVE;
>>> +       flags |= ROCKER_OP_FLAG_NOWAIT | ROCKER_OP_FLAG_REMOVE;
>>
>>I understand the two changes below where you're removing NOWAIT, but
>>here you're adding NOWAIT which I'm not sure how that is related to
>>the switchdev core changes.  Is this two patches?
>
> I removed ROCKER_OP_FLAG_NOWAIT from attr_set. But here in
> rocker_port_fdb_flush, which is called from attr_set, we call
> rocker_port_fdb_learn with spin lock. Therefore I had to put
> ROCKER_OP_FLAG_NOWAIT here. Before ROCKER_OP_FLAG_NOWAIT removal from
> attr_set this was there already.

Gotcha.

Acked-by: Scott Feldman <sfeldma@...il.com>
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