[Click] Click and e1000e

[Roman Chertov]

Adam Greenhalgh wrote:
> Hi,
> 
> I've been playing with the ixgbe driver, I have reception for a single
> queue working but am currently trying to get multiqueue support
> working.
> 
> Does any one have any thoughts on how click should handle NICs which
> support multi queuing ? Our current thinking is that each queue needs
> a separate click "poll" element to enable multithreading to work.
> However this breaks the current poll element device ownership model.

I am not sure if creating a poll element per queue is good idea, as it 
will generate a lot of wasted cycles.  I think it would be better to 
configure a PollDevice to have multiple outputs corresponding to the 
number of queues it is configured to serve.  Also, I am not sure how 
many people will want to use the Microsoft toeplitz RSS hash to enable 
multiple input queuing in the first place.

ToDevice in polling mode can be made to accept multiple input ports and 
then according to the port it would put the packet in the corresponding 
output queue.  Then the card will serve the output queues in round robin 
fashion.  I think it might be interesting to modify ToDevice further, to 
allow priority processing of the output queues.

Roman

> 
> Adam
> 
> 2008/8/18 Roman Chertov <rchertov at cs.ucsb.edu>:
>> Hello,
>>    I am not sure how many people follow e1000, list but they have made
>> a split between e1000 to e1000 and e1000e.  There is also an igb driver
>> which is pretty similar to e1000e code.  We got 6 quad-port Intel which
>> require the use of the igb driver.  I am currently trying to port the
>> igb driver to Click, and I am facing a few issues.  The main issue is
>> when the machine crashes, it has a tendency to damage the file system,
>> so that even fsck cannot fix all the issues.  I am curious if anybody
>> had issues with crashes causing fs corruption and how the minimized the
>> effects.
>>
>> Roman
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>>
>