pktgen patch available for perusal.

[Ben Greear <greearb@candelatech.com>]

I've completed the first pass of my changes to pktgen in 2.6.18.
Many of these features are probably DOA based on previous conversations,
but perhaps this will help someone....

Changes:
* use a nano-second timer based on the scheduler timer (TSC) for relative times, instead of get_time_of_day.
* Don't busy-spin:
    * add hook to netdevice wake tx queue to re-start when queue was stopped.
    * add logic to pktgen to register/unregister this hook.
    * accumulate delay and sleep interruptible on a queue when 1ms of sleep has accumulated
      or when the associated netdev tx-queues for pktgen devices needing to transmit are asleep.
    (This all assumes that HZ is 1000, could probably work with other HZ with minor work.)
* Add receive logic to dev.c so that pktgen can receive packets and report on various stats
   including latency, packet loss, jitter, etc.
* Remove the if-lock, primarily by making the 'add-interface' logic deferred to the
   thread's main loop.  It's likely I missed a corner case or two here, hopefully I'll
   find them all in testing...
* Add ioctl to grab all of the pktgen stats in one call.

The pktgen.[ch] patch is here:  http://www.candelatech.com/oss/pktgen.patch

The full patch, including the callback hooks (and several other features)
is located here:  http://www.candelatech.com/oss/candela_2.6.18.patch

Thanks,
Ben

-- 
Ben Greear <greearb@candelatech.com>
Candela Technologies Inc  http://www.candelatech.com