Re: [dpdk-dev] [PATCHv2 0/5] ethdev: add new API to retrieve RX/TX queue information

[Bruce Richardson <bruce.richardson@intel.com>]

On Thu, Jun 18, 2015 at 01:30:33PM +0000, Walukiewicz, Miroslaw wrote:
> Konstantin, 
> 
> Is there a possibility to read information about available space in NIC queue for TX.
> 
> It is quite easy to compute (or even available directly)  and very useful especially for application sending multi-descriptor packets like TCP TSO. 
> 
> Now there is no access to such information and the transmit packet function must be called to 
> be sure that there is available space.
> 
> Mirek
> 

Hi Mirek,

I'm not sure this function is the right place for such a query. It seems that
a function like you require needs to be used on the datapath, while this API
is not planned to be high-performance. I think that it might be better to
add an equivalent function to the existing RX descriptor querying function.

/Bruce

> > -----Original Message-----
> > From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of Konstantin Ananyev
> > Sent: Thursday, June 18, 2015 3:19 PM
> > To: dev@dpdk.org
> > Subject: [dpdk-dev] [PATCHv2 0/5] ethdev: add new API to retrieve RX/TX
> > queue information
> > 
> > Add the ability for the upper layer to query RX/TX queue information.
> > Right now supported for:
> > ixgbe, i40e, e1000 PMDs.
> > 
> > Konstantin Ananyev (5):
> >   ethdev: add new API to retrieve RX/TX queue information
> >   i40e: add support for eth_(rxq|txq)_info_get
> >   ixgbe: add support for eth_(rxq|txq)_info_get
> >   e1000: add support for eth_(rxq|txq)_info_get
> >   testpmd: add new command to display RX/TX queue information
> > 
> >  app/test-pmd/cmdline.c           | 48 +++++++++++++++++++++++++
> >  app/test-pmd/config.c            | 67
> > ++++++++++++++++++++++++++++++++++
> >  app/test-pmd/testpmd.h           |  2 ++
> >  drivers/net/e1000/e1000_ethdev.h | 12 +++++++
> >  drivers/net/e1000/em_ethdev.c    |  2 ++
> >  drivers/net/e1000/em_rxtx.c      | 38 ++++++++++++++++++++
> >  drivers/net/e1000/igb_ethdev.c   |  4 +++
> >  drivers/net/e1000/igb_rxtx.c     | 36 +++++++++++++++++++
> >  drivers/net/i40e/i40e_ethdev.c   |  2 ++
> >  drivers/net/i40e/i40e_ethdev.h   |  5 +++
> >  drivers/net/i40e/i40e_rxtx.c     | 42 ++++++++++++++++++++++
> >  drivers/net/ixgbe/ixgbe_ethdev.c |  4 +++
> >  drivers/net/ixgbe/ixgbe_ethdev.h |  6 ++++
> >  drivers/net/ixgbe/ixgbe_rxtx.c   | 42 ++++++++++++++++++++++
> >  lib/librte_ether/rte_ethdev.c    | 54 ++++++++++++++++++++++++++++
> >  lib/librte_ether/rte_ethdev.h    | 77
> > +++++++++++++++++++++++++++++++++++++++-
> >  16 files changed, 440 insertions(+), 1 deletion(-)
> > 
> > --
> > 1.8.5.3
>