netdev - Re: [PATCH v4 1/1] rps: core implementation

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Message-ID: <65634d660911201604y6a6a602ex57ffaf788a3a2be1@mail.gmail.com>
Date:	Fri, 20 Nov 2009 16:04:47 -0800
From:	Tom Herbert <therbert@...gle.com>
To:	Stephen Hemminger <shemminger@...tta.com>
Cc:	David Miller <davem@...emloft.net>,
	Linux Netdev List <netdev@...r.kernel.org>
Subject: Re: [PATCH v4 1/1] rps: core implementation

On Fri, Nov 20, 2009 at 3:42 PM, Stephen Hemminger
<shemminger@...tta.com> wrote:
> On Fri, 20 Nov 2009 15:28:58 -0800
> Tom Herbert <therbert@...gle.com> wrote:
>
>> @@ -861,6 +884,9 @@ struct net_device {
>>
>>       struct netdev_queue     rx_queue;
>>
>> +     struct dev_rps_maps     *dev_rps_maps;  /* Per-NAPI maps for
>> +                                                receive packet steeing */
>> +
>
> How does this work for devices with:
>   * multiqueue - one device has multiple NAPI instances

Each NAPI instance has its own map (dev_rps_maps hold the array of these maps)

>   * mulitport  - one NAPI shared by multiple devices
>
I have not tested that, so I'm not sure.  But, I believe since the per
NAPI maps are kept in the netdevice (not in napi structure) this would
mean that each of those devices has its own per NAPI rps map(s).

Tom
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