Re: [dpdk-dev] [PATCH v2] eventdev: use links map to unlink queues

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

On Tue, Dec 12, 2017 at 04:08:12PM +0000, Eads, Gage wrote:
>
>
> > -----Original Message-----
> > From: Pavan Nikhilesh [mailto:pbhagavatula@caviumnetworks.com]
> > Sent: Tuesday, December 12, 2017 3:34 AM
> > To: jerin.jacob@caviumnetworks.com; Richardson, Bruce
> > <bruce.richardson@intel.com>; Van Haaren, Harry
> > <harry.van.haaren@intel.com>; Eads, Gage <gage.eads@intel.com>;
> > hemant.agrawal@nxp.com; nipun.gupta@nxp.com; Rao, Nikhil
> > <nikhil.rao@intel.com>; santosh.shukla@caviumnetworks.com
> > Cc: dev@dpdk.org; Pavan Nikhilesh <pbhagavatula@caviumnetworks.com>
> > Subject: [dpdk-dev] [PATCH v2] eventdev: use links map to unlink queues
> >
> > The octeontx event device doesn't store the queues to port mapping as a result
> > it cannot return the exact number of queues unlinked from a port when
> > application wants to unlink all the queues mapped (supplies queues param as
> > NULL).
> >
> > Using links_map we can determine the exact queues mapped to a specific port
> > and unlink them.
> >
> > Signed-off-by: Pavan Nikhilesh <pbhagavatula@caviumnetworks.com>
> > ---
> >  lib/librte_eventdev/rte_eventdev.c | 33 ++++++++++++++++++++++++++-------
> >  1 file changed, 26 insertions(+), 7 deletions(-)
> >
> > diff --git a/lib/librte_eventdev/rte_eventdev.c
> > b/lib/librte_eventdev/rte_eventdev.c
> > index e0c2a78..b43ffbf 100644
> > --- a/lib/librte_eventdev/rte_eventdev.c
> > +++ b/lib/librte_eventdev/rte_eventdev.c
> > @@ -888,7 +888,8 @@ rte_event_port_unlink(uint8_t dev_id, uint8_t port_id,  {
> >  	struct rte_eventdev *dev;
> >  	uint8_t all_queues[RTE_EVENT_MAX_QUEUES_PER_DEV];
> > -	int i, diag;
> > +	uint8_t linked_queues[RTE_EVENT_MAX_QUEUES_PER_DEV];
> > +	int i, diag, j;
> >  	uint16_t *links_map;
> >
> >  	RTE_EVENTDEV_VALID_DEVID_OR_ERRNO_RET(dev_id, -EINVAL, 0);
> > @@ -906,13 +907,34 @@ rte_event_port_unlink(uint8_t dev_id, uint8_t
> > port_id,
> >  		return 0;
> >  	}
> >
> > +	links_map = dev->data->links_map;
> > +	/* Point links_map to this port specific area */
> > +	links_map += (port_id * RTE_EVENT_MAX_QUEUES_PER_DEV);
> > +
> >  	if (queues == NULL) {
> > -		for (i = 0; i < dev->data->nb_queues; i++)
> > -			all_queues[i] = i;
> > +		j = 0;
> > +		for (i = 0; i < dev->data->nb_queues; i++) {
> > +			if (links_map[i] !=
> > +
> > 	EVENT_QUEUE_SERVICE_PRIORITY_INVALID) {
> > +				all_queues[j] = i;
> > +				j++;
> > +			}
> > +		}
> >  		queues = all_queues;
> > -		nb_unlinks = dev->data->nb_queues;
> > +	} else {
> > +		j = 0;
> > +		for (i = 0; i < nb_unlinks; i++) {
> > +			if (links_map[queues[i]] ==
> > +
> > 	EVENT_QUEUE_SERVICE_PRIORITY_INVALID)
> > +				break;
> > +
> > +			linked_queues[j] = queues[i];
> > +			j++;
> > +		}
> > +		queues = linked_queues;
> >  	}
> >
>
> Looks good. If you want, you can simplify the else case like so:
>
> +	} else {
> +		for (j = 0; j < nb_unlinks; j++)
> +			if (links_map[queues[j]] ==
> +					EVENT_QUEUE_SERVICE_PRIORITY_INVALID)
> +				break;
> +	}

Thanks Gage, will clean up 'linked_queues' and send v3.

Pavan
>
> Up to you. Either way:
> Acked-by: Gage Eads <gage.eads@intel.com>