Re: [dpdk-dev] [PATCH 1/2] net/octeontx: add channel to port id mapping

[Pavan Nikhilesh Bhagavatula <pbhagavatula@caviumnetworks.com>]

On Fri, Dec 08, 2017 at 09:39:00AM -0800, Ferruh Yigit wrote:
> On 12/8/2017 3:08 AM, Pavan Nikhilesh Bhagavatula wrote:
> > On Thu, Dec 07, 2017 at 04:41:04PM -0800, Ferruh Yigit wrote:
> >> On 11/28/2017 6:58 AM, Pavan Nikhilesh wrote:
> >>> The channel to port id map is used by event octeontx to map the received
> >>> wqe to the respective ethdev port.
> >>>
> >>> Signed-off-by: Pavan Nikhilesh <pbhagavatula@caviumnetworks.com>
> >>
> >> <...>
> >>
> >>> @@ -52,12 +52,18 @@
> >>>  #define OCTEONTX_VDEV_NR_PORT_ARG		("nr_port")
> >>>  #define OCTEONTX_MAX_NAME_LEN			32
> >>>
> >>> +#define OCTEONTX_MAX_BGX_PORTS			4
> >>> +#define OCTEONTX_MAX_LMAC_PER_BGX		4
> >>> +
> >>>  static inline struct octeontx_nic *
> >>>  octeontx_pmd_priv(struct rte_eth_dev *dev)
> >>>  {
> >>>  	return dev->data->dev_private;
> >>>  }
> >>>
> >>> +uint16_t __rte_cache_aligned
> >>> +octeontx_pchan_map[OCTEONTX_MAX_BGX_PORTS][OCTEONTX_MAX_LMAC_PER_BGX];
> >>
> >> defining global variable in header is generally not good a idea, is there a
> >> reason why not variable defined in octeontx_ethdev.c and exported here, so that
> >> both octeontx ethdev and eventdev can use it?
> >
> > The reason extern definition in .h and declaration in .c is not done is that
> > it would break shared compilation.
>
> This should work, you can put object into .so and access from application and/or
> other shared libraries. I did a quick test, and seems working, is there anything
> I am missing.
>
> > The other approach is to do it in  octeontx_mempool area but it wouldnt make
> > sense.
> > I could use the mempool approach if it sounds good to you (or) let me know
> > if any alternate approach comes to your mind.
> >
> >>
> >> btw, is build time dependency between octeontx ethdev and eventdev documented
> >> somewhere?
> >
> > Currently, there is no build time dependency between event_octeontx and
> > eth_octeontx i.e everything builds fine with CONFIG_RTE_LIBRTE_OCTEONTX_PMD=n.
>
> octeontx eventdev is using a variable from octeontx ethdev header, how can be
> there is no build time dependency?
>
Hi Ferruh,

I misread the order in which thing are built. I will send out a v2 with the
suggested changes soon.

Thanks,
Pavan

> >
> > Thanks,
> > Pavan
> >
>