Re: transmit functions of dpdk

Hi Bruce,

In my use case, I want to have three NIC TX queues per port, and want to
fill one NIC TX queue and want to empty the other queue. Is it possible
this through tx_burst or do I need to implement these queues in
applications as you suggested before. However, in this case, I would have
then one NIC TX queues and three queues in an application which actually
transmits packets to this NIC TX queue. Am I right?

Thanks,
Sachin.

On Wed, Dec 10, 2014 at 12:22 PM, Bruce Richardson <
bruce.richardson-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org> wrote:

On Wed, Dec 10, 2014 at 12:03:41PM +0100, Sachin Sharma wrote:

quoted

Dear all,

 In my algorithm, I am interested to perform  two activities - (1)
transmitting packets to a tx_queue and (2) transmitting packets from
tx_queue to a wire - separately. I have gone through the code by putting
logs in the dpdk code and found that there is a function rte_eth_tx_burst
which transmits packets to a specific queue. However, when I debugged

more

quoted

then I found that this function just calls eth_igb_xmit_pkts
from librte_pmd_e1000, and this function just directly write the packets

to

quoted

the wire by writing all packets into registers. Could you please suggest
how to implement these two functions if these are not implemented already
in dpdk?



Thanks & Regards,
Sachin.

Hi Sachin,

anything written to the NIC TX queue is automatically put onto the wire
unless
the NIC port is down or the wire is unplugged etc. What is your use-case
that you
need to do this? I would suggest doing internal buffering in your
application,
as many DPDK example applications do, and then call tx_burst to put your
packets
on the wire when you want this capability.

Regards,
/Bruce