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Date: Tue, 27 Jun 2017 13:38:21 +0530
From: Jerin Jacob <jerin.jacob@caviumnetworks.com>
To: "Eads, Gage" <gage.eads@intel.com>
Cc: "dev@dpdk.org" <dev@dpdk.org>,
"Richardson, Bruce" <bruce.richardson@intel.com>,
"Van Haaren, Harry" <harry.van.haaren@intel.com>,
"hemant.agrawal@nxp.com" <hemant.agrawal@nxp.com>,
"nipun.gupta@nxp.com" <nipun.gupta@nxp.com>,
"Vangati, Narender" <narender.vangati@intel.com>,
"Rao, Nikhil" <nikhil.rao@intel.com>
Message-ID: <20170627080820.GA14276@jerin>
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Subject: Re: [dpdk-dev] [PATCH] eventdev: add producer enqueue hint
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-----Original Message-----
> Date: Mon, 26 Jun 2017 15:44:10 +0000
> From: "Eads, Gage" <gage.eads@intel.com>
> To: Jerin Jacob <jerin.jacob@caviumnetworks.com>, "dev@dpdk.org"
> <dev@dpdk.org>
> CC: "Richardson, Bruce" <bruce.richardson@intel.com>, "Van Haaren, Harry"
> <harry.van.haaren@intel.com>, "hemant.agrawal@nxp.com"
> <hemant.agrawal@nxp.com>, "nipun.gupta@nxp.com" <nipun.gupta@nxp.com>,
> "Vangati, Narender" <narender.vangati@intel.com>, "Rao, Nikhil"
> <nikhil.rao@intel.com>
> Subject: RE: [dpdk-dev] [PATCH] eventdev: add producer enqueue hint
>
>
>
> > -----Original Message-----
> > From: Jerin Jacob [mailto:jerin.jacob@caviumnetworks.com]
> > Sent: Monday, June 12, 2017 6:46 AM
> > To: dev@dpdk.org
> > Cc: Richardson, Bruce <bruce.richardson@intel.com>; Van Haaren, Harry
> > <harry.van.haaren@intel.com>; hemant.agrawal@nxp.com; Eads, Gage
> > <gage.eads@intel.com>; nipun.gupta@nxp.com; Vangati, Narender
> > <narender.vangati@intel.com>; Rao, Nikhil <nikhil.rao@intel.com>; Jerin Jacob
> > <jerin.jacob@caviumnetworks.com>
> > Subject: [dpdk-dev] [PATCH] eventdev: add producer enqueue hint
> >
> > Some PMD like OCTEONTX can have optimized handling of events if the PMD
> > knows it is a producer pattern in advance.
> > For instance, OCTEONTX PMD can support burst mode if op ==
> > RTE_EVENT_OP_NEW.
> >
> > Since the event producer initialize(set all_op_new == 1) the event object before
> > the main producer loop, This scheme does not call for any performance
> > regression on other PMDs.
> >
> > Signed-off-by: Jerin Jacob <jerin.jacob@caviumnetworks.com>
> > ---
> > Another option is to add a flag in enqueue API or have parallel enqueue API.
> > ---
> > drivers/event/octeontx/ssovf_worker.c | 12 ++++++++++--
> > lib/librte_eventdev/rte_eventdev.h | 10 +++++++++-
> > 2 files changed, 19 insertions(+), 3 deletions(-)
> >
> > diff --git a/drivers/event/octeontx/ssovf_worker.c
> > b/drivers/event/octeontx/ssovf_worker.c
> > index ad3fe684d..209c595cf 100644
> > --- a/drivers/event/octeontx/ssovf_worker.c
> > +++ b/drivers/event/octeontx/ssovf_worker.c
> > @@ -196,8 +196,16 @@ ssows_enq(void *port, const struct rte_event *ev)
> > uint16_t __hot ssows_enq_burst(void *port, const struct rte_event ev[],
> > uint16_t nb_events) {
> > - RTE_SET_USED(nb_events);
> > - return ssows_enq(port, ev);
> > + uint16_t i;
> > + struct ssows *ws = port;
> > +
> > + if (ev[0].all_op_new) {
> > + rte_smp_wmb();
> > + for (i = 0; i < nb_events; i++)
> > + ssows_new_event(ws, &ev[i]);
> > + return i;
> > + } else
> > + return ssows_enq(port, ev);
> > }
> >
> > void
> > diff --git a/lib/librte_eventdev/rte_eventdev.h
> > b/lib/librte_eventdev/rte_eventdev.h
> > index a248fe90e..1c1a46593 100644
> > --- a/lib/librte_eventdev/rte_eventdev.h
> > +++ b/lib/librte_eventdev/rte_eventdev.h
> > @@ -933,7 +933,15 @@ struct rte_event {
> > * and is undefined on dequeue.
> > * @see RTE_EVENT_OP_NEW, (RTE_EVENT_OP_*)
> > */
> > - uint8_t rsvd:4;
> > + uint8_t all_op_new:1;
> > + /**< Valid only with event enqueue operation - This hint
> > + * indicates that the enqueue request has only the
> > + * events with op == RTE_EVENT_OP_NEW.
> > + * The event producer, typically use this pattern to
> > + * inject the events to eventdev.
> > + * @see RTE_EVENT_OP_NEW
> > rte_event_enqueue_burst()
> > + */
> > + uint8_t rsvd:3;
> > /**< Reserved for future use */
> > uint8_t sched_type:2;
> > /**< Scheduler synchronization type
> > (RTE_SCHED_TYPE_*)
> > --
> > 2.13.1
>
> I slightly prefer the parallel enqueue API -- I can see folks making the mistake of setting all_op_new without setting the op to RTE_EVENT_OP_NEW, and later adding a "forward-only" enqueue API could be interesting for the sw PMD -- but this looks fine to me. Curious if others have any thoughts.
If forward-only parallel enqueue API interesting for the SW PMD then I
can drop this one and introduce forward-only API. Let me know if others
have any thoughts?