[dpdk-dev] [PATCH v4] eventdev: add errno-style return values
Jerin Jacob
jerin.jacob at caviumnetworks.com
Wed Mar 22 07:53:53 CET 2017
On Tue, Mar 21, 2017 at 08:38:25PM +0000, Eads, Gage wrote:
>
>
> > -----Original Message-----
> > From: Jerin Jacob [mailto:jerin.jacob at caviumnetworks.com]
> > Sent: Tuesday, March 21, 2017 6:06 AM
> > To: Eads, Gage <gage.eads at intel.com>
> > Cc: dev at dpdk.org; Richardson, Bruce <bruce.richardson at intel.com>;
> > hemant.agrawal at nxp.com; Van Haaren, Harry <harry.van.haaren at intel.com>;
> > nipun.gupta at nxp.com
> > Subject: Re: [PATCH v4] eventdev: add errno-style return values
> >
> > On Fri, Mar 17, 2017 at 09:51:28AM -0500, Gage Eads wrote:
> > > From: "Eads, Gage" <gage.eads at intel.com>
> > >
> > > This commit adds rte_errno return values to rte_event_enqueue_burst()
> > > and rte_event_dequeue_burst().
> > >
> > > These return values allows user software to differentiate between an
> > > invalid argument (such as an invalid queue_id or sched_type in an
> > > enqueued
> > > event) and backpressure from the event device.
> > >
> > > The port and device ID checks are placed in RTE_LIBRTE_EVENTDEV_DEBUG
> > > header guards to avoid the performance hit in non-debug execution.
> > >
> > > Signed-off-by: Gage Eads <gage.eads at intel.com>
> > > ---
> > > Changes for v2:
> > > - Remove rte_errno initialization
> > > Changes for v3:
> > > - Fix checkpatch and check-git-log.sh errors Changes for v4:
> > > - v3 was incorrectly based on v1, v4 is instead based on v2's
> > > changes
> > >
> > > lib/librte_eventdev/rte_eventdev.h | 40
> > > +++++++++++++++++++++++++++++++++++---
> > > 1 file changed, 37 insertions(+), 3 deletions(-)
> > >
> > > diff --git a/lib/librte_eventdev/rte_eventdev.h
> > > b/lib/librte_eventdev/rte_eventdev.h
> > > index 2b30a35..a45c81a 100644
> > > --- a/lib/librte_eventdev/rte_eventdev.h
> > > +++ b/lib/librte_eventdev/rte_eventdev.h
> > > @@ -245,6 +245,7 @@ extern "C" {
> > >
> > > #include <rte_common.h>
> > > #include <rte_memory.h>
> > > +#include <rte_errno.h>
> > >
> > > struct rte_mbuf; /* we just use mbuf pointers; no need to include
> > > rte_mbuf.h */
> > >
> > > @@ -1118,9 +1119,14 @@ rte_event_schedule(uint8_t dev_id)
> > > * The number of event objects actually enqueued on the event device. The
> > > * return value can be less than the value of the *nb_events* parameter
> > when
> > > * the event devices queue is full or if invalid parameters are specified in a
> > > - * *rte_event*. If return value is less than *nb_events*, the remaining
> > events
> > > - * at the end of ev[] are not consumed,and the caller has to take care of
> > them
> > > - *
> > > + * *rte_event*. If the return value is less than *nb_events*, the remaining
> > > + * events at the end of ev[] are not consumed and the caller has to take
> > care
> > > + * of them, and rte_errno is set accordingly. Possible errno values include:
> > > + * -(-EINVAL) The port ID is invalid, device ID is invalid, an event's queue
> > > + * ID is invalid, or an event's sched type doesn't match the
> > > + * capabilities of the destination queue.
> > > + * -(-ENOSPC) The event port was backpressured and unable to enqueue
> > > + * one or more events.
> >
> > Some reason you haven't addressed the comments in v2.i.e add a note that -
> > ENOSPC applicable only for *closed system*
> >
> > http://dpdk.org/ml/archives/dev/2017-March/060352.html
> >
>
> Will fix.
>
> >
> > > * @see rte_event_port_enqueue_depth()
> > > */
> > > static inline uint16_t
> > > @@ -1129,6 +1135,20 @@ rte_event_enqueue_burst(uint8_t dev_id, uint8_t
> > > port_id, {
> > > struct rte_eventdev *dev = &rte_eventdevs[dev_id];
> > >
> > > +#ifdef RTE_LIBRTE_EVENTDEV_DEBUG
> >
> > Some reason you haven't addressed the comments in v2.i.e Not fixed the build
> > issue.
> > http://dpdk.org/ml/archives/dev/2017-March/060352.html
> >
> > You can reproduce it by setting CONFIG_RTE_LIBRTE_EVENTDEV_DEBUG=y in
> > common config.
> >
> > We have two approaches to fix it
> > 1/ Pollute lib/librte_eventdev/rte_eventdev.h header with implementation
> > specific header files
> >
> > Or
> >
> > 2/ Have neat pmd debug common function in rte_eventdev_pmd.h.Let all PMD
> > driver call it by including rte_eventdev_pmd.h
> >
>
> I'd prefer to avoid the issue by dropping the debug message and RTE_EVENTDEV_DETACHED, like so:
>
> #ifdef RTE_LIBRTE_EVENTDEV_DEBUG
> if (dev_id >= RTE_EVENT_MAX_DEVS || !rte_eventdevs[dev_id].attached) {
> rte_errno = -EINVAL;
> return 0;
> }
>
> if (port_id >= dev->data->nb_ports) {
> rte_errno = -EINVAL;
> return 0;
> }
> #endif
>
> What do you think?
Looks good to me.
More information about the dev
mailing list