looking for decent, current online discussion of user-space drivers

looking for decent, current online discussion of user-space drivers

[Robert P. J. Day]

  a colleague asks me about the implications of porting a pile of code
from a non-linux embedded OS to linux, and simply rewriting most of it
as user-space drivers, as opposed to a total rewrite to kernel code.
i'm in no way an authority on user-space drivers, so i'm looking for
any decent, up-to-date discussions, not so much on the technical
aspects, but more the *implications* of doing this.

  i'm aware of mmap(), and i'm reading up on UIO, and i've found a few
online pieces that look informative:

http://www.embedded.com/design/operating-systems/4401769/Device-drivers-in-user-space
http://www.enea.com/Documents/Resources/Whitepapers/Enea-User-Space-Drivers-in-Linux_Whitepaper_2013.pdf

so is there something that elaborates on both the pros and cons of
doing this? in particular, are there any nice examples of this that
can be downloaded, built and played with? thanks muchly.

rday

-- 

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Robert P. J. Day                                 Ottawa, Ontario, CANADA
                        http://crashcourse.ca

Twitter:                                       http://twitter.com/rpjday
LinkedIn:                               http://ca.linkedin.com/in/rpjday
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looking for decent, current online discussion of user-space drivers

[Anupam Kapoor]

>>>>> [2015-11-17T15:43:52+0530]: "Robert P. J. Day" (rpjday):
,----[ rpjday ]
| ....
| in particular, are there any nice examples of this that
| can be downloaded, built and played with? thanks muchly.
`----
there is snabbswitch (https://github.com/SnabbCo/snabbswitch) where
folks have written 82599 (intel-10g card) driver in lua
(https://github.com/SnabbCo/snabbswitch/tree/master/src/apps/intel)

might be useful...

--
kind regards
anupam

looking for decent, current online discussion of user-space drivers

[Robert P. J. Day]

On Tue, 17 Nov 2015, Anupam Kapoor wrote:

>
> >>>>> [2015-11-17T15:43:52+0530]: "Robert P. J. Day" (rpjday):
> ,----[ rpjday ]
> | ....
> | in particular, are there any nice examples of this that
> | can be downloaded, built and played with? thanks muchly.
> `----
> there is snabbswitch (https://github.com/SnabbCo/snabbswitch) where
> folks have written 82599 (intel-10g card) driver in lua
> (https://github.com/SnabbCo/snabbswitch/tree/master/src/apps/intel)
>
> might be useful...

   ooooh, yes, thanks for the link. just to keep track of what i
collect, i started a new wiki page:

http://www.crashcourse.ca/wiki/index.php/User_space_drivers

i'll add anything else that pops up that looks like it's useful.

rday

-- 

========================================================================
Robert P. J. Day                                 Ottawa, Ontario, CANADA
                        http://crashcourse.ca

Twitter:                                       http://twitter.com/rpjday
LinkedIn:                               http://ca.linkedin.com/in/rpjday
========================================================================