[etherlab-users] Waiting for network receive?

[Raz Ben Yehuda]

I was looking at the code and they map the datagram directly to user
space and has a skb ring size of 2 frames. data cannot be available for
a re-write until it is acked by the interrupt completion of the ethernet
device. 
You need to query the skb->users counter and check when it is
decremented back -- meaning when transmission complete takes place.

I believe the curretn design might cause problem in heavy traffic or in
preempt rt when the transmit complete threaded interrupt has a "too" low
priority.

On Thu, 2012-06-28 at 19:38 +0200, Johnathan Van Why wrote:
> The software system we are setting up needs to be able to send an
> EtherCAT frame, then wait until the network data is available for
> processing to resume (rather than wait until the next cycle time). Is
> there any way to do that with the EtherCAT Master? This is a userspace
> application.
> 
> Thanks for any help,
> Johnathan Van Why
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> etherlab-users mailing list
> etherlab-users at etherlab.org
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