about netmap NETMAP_HW_RING recv pcaket

[rizzo]

On Thu, Jun 28, 2012 at 09:24:59PM +0800, root at 9du.org wrote:
> in pkt-gen.c 
> tifreq.nr_ringid = (g.nthreads > 1) ? (i | NETMAP_HW_RING) : 0; 
> 
> in netmap.c 
> if (priv->np_qlast != NETMAP_HW_RING) {
> lim_tx = lim_rx = priv->np_qlast;
> }
> ....
> 
> if nthreads 2.but have 8 num_tx_rings.(ixgbe default is 8)
> looks like
> thread #1 priv->np_qfirst = 0 priv->np_qlast = 1 
> thread #2 priv->np_qfirst = 1 priv->np_qlast = 2
>  
> if packet in  num_tx_rings 2-7 will be lost some packet? 

if you decide to attach to individual rings then it is
up to you to bind enough threads as there are rings.
pkt-gen.c is only a test program, not all combinations
of options are necessary meaningful

cheers
luigi