From mboxrd@z Thu Jan  1 00:00:00 1970
From: freeman.zhang1992@gmail.com (Freeman Zhang)
Date: Tue, 24 Mar 2015 09:34:02 +0800
Subject: Writing driver for a net device which does not support interrupt
In-Reply-To: <55104654.3020406@pjd.me.uk>
References: <550FF047.90103@gmail.com> <55104654.3020406@pjd.me.uk>
Message-ID: <5510BF0A.3000108@gmail.com>
To: kernelnewbies@lists.kernelnewbies.org
List-Id: kernelnewbies.lists.kernelnewbies.org

Hi phil,

Thanks for your reply! I googled timer, it might be a solution except
that interval granularity is a little bit large. This device is for high
performance network. I'm not sure whether the missmatch will cause problem.

And I just figured another potential solution, to use soft interrupt to
active NAPI. I will spend some time to varify these ideas.


Thanks again!
Freeman

-------- Original Message --------
> 
> 
> On 23/03/15 10:51, Freeman Zhang wrote:
>> I'm writing a net device driver for my final project in college. But the
>> half-finished device doesn't support interrupt yet(those hardware
>> guys...)
>>
>> So I'm wondering if there is some way to poll the device for its status
>> and events.
> 
> You should take a look at kernel timers, this is a rather old resource
> and was just the first hit in a google search but it should still be
> relevant.
> 
> http://www.ibm.com/developerworks/library/l-timers-list/
> 
> Kernel timers will sort of prepare you for interrupts i.e. a kernel
> timer will fire every $time_value and you can put your code which should
> normally run during an interrupt in the callback code.
> 
> I've used kernel timers to debug interrupts on our hardware devices,
> i.e. there have been times when the hardware has stopped raising
> interrupts and I've put timers in to cover this. For example a new
> firmware might work fine, but have completely broken interrupts or not
> fire interrupts often enough and timers can prove to the hardware guys
> that it's interrupts at fault ;)
> 
> hint: you might also want to look at tasklets and have your timer
> callback just call a tasklet.
> 
> Phil

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