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SubjectRe: [RFC Patch 1/3] netpoll: add generic support for bridge and bonding devices
Matt Mackall wrote:
> On Mon, 2010-03-22 at 04:17 -0400, Amerigo Wang wrote:
>> This whole patchset is for adding netpoll support to bridge and bonding
>> devices. I already tested it for bridge, bonding, bridge over bonding,
>> and bonding over bridge. It looks fine now.
>
> Ages ago, Jeff Moyer took a run at this, added him to the cc: on the off
> chance he still cares.
>
>> Please comment.
>>
>>
>> To make bridge and bonding support netpoll, we need to adjust
>> some netpoll generic code. This patch does the following things:
>>
>> 1) introduce two new priv_flags for struct net_device:
>> IFF_IN_NETPOLL which identifies we are processing a netpoll;
>> IFF_DISABLE_NETPOLL is used to disable netpoll support for a device
>> at run-time;
>
> This one is a little worrisome. I've tried to keep the netpoll code
> restricted to as tight an area as possible. Adding new flags like these
> that random drivers might try to fiddle with seems like a good way for a
> driver writer to get in trouble. Also flag space is filling up.


Somewhat, but currently I don't have other way to replace this.
Any suggestions?

>
>> 2) introduce three new methods for netdev_ops:
>> ->ndo_netpoll_setup() is used to setup netpoll for a device;
>> ->ndo_netpoll_xmit() is used to transmit netpoll requests;
>> ->ndo_netpoll_cleanup() is used to clean up netpoll when a device is
>> removed.
>
> Seems like a lot of interface for something to be used by only a couple
> core drivers. Hopefully Dave has an opinion here.
>

Yeah, I worry about this too, maybe we can group those methods
for netpoll together into another struct, and just put a pointer
here?

Thanks!


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