netdev - Re: [patch net-next RFC 2/3] switchdev: allow caller to explicitly use deferred attr

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Date:	Wed, 7 Oct 2015 23:03:35 -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>, 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>
Subject: Re: [patch net-next RFC 2/3] switchdev: allow caller to explicitly
 use deferred attr_set version

On Wed, Oct 7, 2015 at 10:39 PM, Jiri Pirko <jiri@...nulli.us> wrote:
> Thu, Oct 08, 2015 at 06:27:07AM CEST, sfeldma@...il.com wrote:
>>On Wed, Oct 7, 2015 at 11:30 AM, Jiri Pirko <jiri@...nulli.us> wrote:
>>> From: Jiri Pirko <jiri@...lanox.com>
>>>
>>> Caller should know if he can call attr_set directly (when holding RTNL)
>>> or if he has to use deferred version of this function.
>>>
>>> This also allows drivers to sleep inside attr_set and report operation
>>> status back to switchdev core. Switchdev core then warns if status is
>>> not ok, instead of silent errors happening in drivers.
>>>
>>> Signed-off-by: Jiri Pirko <jiri@...lanox.com>
>>> ---
>>>  include/net/switchdev.h   |   2 +
>>>  net/bridge/br_stp.c       |   4 +-
>>>  net/switchdev/switchdev.c | 113 +++++++++++++++++++++++++---------------------
>>>  3 files changed, 65 insertions(+), 54 deletions(-)
>>>
>>> diff --git a/include/net/switchdev.h b/include/net/switchdev.h
>>> index 89266a3..320be44 100644
>>> --- a/include/net/switchdev.h
>>> +++ b/include/net/switchdev.h
>>> @@ -168,6 +168,8 @@ int switchdev_port_attr_get(struct net_device *dev,
>>>                             struct switchdev_attr *attr);
>>>  int switchdev_port_attr_set(struct net_device *dev,
>>>                             struct switchdev_attr *attr);
>>> +int switchdev_port_attr_set_deferred(struct net_device *dev,
>>> +                                    struct switchdev_attr *attr);
>>
>>Rather than adding another op, use attr->flags and define:
>>
>>#define SWITCHDEV_F_DEFERRED          BIT(x)
>>
>>So we get:
>>
>>void br_set_state(struct net_bridge_port *p, unsigned int state)
>>{
>>        struct switchdev_attr attr = {
>>                .id = SWITCHDEV_ATTR_ID_PORT_STP_STATE,
>>+              .flags = SWITCHDEV_F_DEFERRED,
>>                .u.stp_state = state,
>>        };
>>        int err;
>>
>>        p->state = state;
>>        err = switchdev_port_attr_set(p->dev, &attr);
>>        if (err && err != -EOPNOTSUPP)
>>                br_warn(p->br, "error setting offload STP state on
>>port %u(%s)\n",
>>                                (unsigned int) p->port_no,
>>p->dev->name);
>>}
>>
>>(And add obj->flags to do the same).
>
> That's what I wanted to avoid. Also because the obj is const and for
> call from work, this flag would have to be removed.

What did you want to avoid?
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