Mapping memory between kernel and user space

[Sri Ram Vemulpali]

Hi Santosa,

   Can you please be more explicit. I do manage buffers internally in
my module.
Some cases if it full I will lose data. Can you please provide more
detailed explanation
on how to approach this. Thanks.

--Sri

On Wed, Feb 9, 2011 at 10:21 PM, Mulyadi Santosa
<mulyadi.santosa at gmail.com> wrote:
> On Thu, Feb 10, 2011 at 06:45, Sri Ram Vemulpali
> <sri.ram.gmu06 at gmail.com> wrote:
>> Hi all,
>>
>>  How do I map some space between kernel and user space. Can anyone
>> point me in to right direction. I was trying to map the packets from
>> my netfilter function to kernel user space, to avoid over head of
>> copying. Thanks in advance.
>
> Not trying to discourage you, but I assume your "filtering" function
> will be engaged many many times in the case of rapid traffic...thus,
> the buffer might grow rapidly too, right? In that case, are you sure
> direct mapping could cope with it? Well unless you're ready to loose
> some data .....
>
> Anyway, I think you can do that by reserve the buffer in user space
> and the get_user_page() them. As the bridge, a unique device with
> ioctl() might do the job.
>
> --
> regards,
>
> Mulyadi Santosa
> Freelance Linux trainer and consultant
>
> blog: the-hydra.blogspot.com
> training: mulyaditraining.blogspot.com
>



-- 
Regards,
Sri.