[dpdk-dev] Bulk dequeue of packets and the returned values, question

[Neil Horman]

On Sun, Sep 28, 2014 at 06:04:42PM +0000, Wiles, Roger Keith wrote:
> I am also looking at the bulk dequeue routines, which the ring can be fixed or variable. On fixed  < 0 on error is returned and 0 if successful. On a variable ring < 0 on error or n on success, but I think n can be zero in the variable case, correct?
> 
Yes, that seems right.

> If these are true then why not have the routines return  < 0 on error and >= 0 on success. Which means a dequeue from a fixed ring would return only ’requested size n’ or < 0 if you error off the 0 case. The 0 case could be OK, if you allow zero to be return on a empty ring for the fixed ring case.
> 
> Does this make sense to anyone?
> 
I agree, I don't see why the behavior is bifurcated the way it is, its
nonsensical.
Neil

> Thanks
> ++Keith
> 
> Keith Wiles, Principal Technologist with CTO office, Wind River mobile 972-213-5533
> 
>