From: Jerin Jacob <jerin.jacob@caviumnetworks.com>
To: Bruce Richardson <bruce.richardson@intel.com>
Cc: <dev@dpdk.org>, <thomas.monjalon@6wind.com>,
<hemant.agrawal@nxp.com>, <gage.eads@intel.com>,
<harry.van.haaren@intel.com>
Subject: Re: [dpdk-dev] [PATCH v2 1/6] eventdev: introduce event driven programming model
Date: Thu, 8 Dec 2016 00:23:03 +0530 [thread overview]
Message-ID: <20161207185303.GA7001@svelivela-lt.caveonetworks.com> (raw)
In-Reply-To: <20161206165119.GB22224@bricha3-MOBL3.ger.corp.intel.com>
On Tue, Dec 06, 2016 at 04:51:19PM +0000, Bruce Richardson wrote:
> On Tue, Dec 06, 2016 at 09:22:15AM +0530, Jerin Jacob wrote:
> > In a polling model, lcores poll ethdev ports and associated
> > rx queues directly to look for packet. In an event driven model,
> > by contrast, lcores call the scheduler that selects packets for
> > them based on programmer-specified criteria. Eventdev library
> > adds support for event driven programming model, which offer
> > applications automatic multicore scaling, dynamic load balancing,
> > pipelining, packet ingress order maintenance and
> > synchronization services to simplify application packet processing.
> >
> > By introducing event driven programming model, DPDK can support
> > both polling and event driven programming models for packet processing,
> > and applications are free to choose whatever model
> > (or combination of the two) that best suits their needs.
> >
> > This patch adds the eventdev specification header file.
> >
> > Signed-off-by: Jerin Jacob <jerin.jacob@caviumnetworks.com>
> > ---
> > + /** WORD1 */
> > + RTE_STD_C11
> > + union {
> > + uint64_t u64;
> > + /**< Opaque 64-bit value */
> > + uintptr_t event_ptr;
> > + /**< Opaque event pointer */
>
> Since we have a uint64_t member of the union, might this be better as a
> void * rather than uintptr_t?
No strong opinion here. For me, uintptr_t looks clean.
But, It is OK to change to void* as per your input.
>
> > + struct rte_mbuf *mbuf;
> > + /**< mbuf pointer if dequeued event is associated with mbuf */
> > + };
> > +};
> > +
> <snip>
> > +/**
> > + * Link multiple source event queues supplied in *rte_event_queue_link*
> > + * structure as *queue_id* to the destination event port designated by its
> > + * *port_id* on the event device designated by its *dev_id*.
> > + *
> > + * The link establishment shall enable the event port *port_id* from
> > + * receiving events from the specified event queue *queue_id*
> > + *
> > + * An event queue may link to one or more event ports.
> > + * The number of links can be established from an event queue to event port is
> > + * implementation defined.
> > + *
> > + * Event queue(s) to event port link establishment can be changed at runtime
> > + * without re-configuring the device to support scaling and to reduce the
> > + * latency of critical work by establishing the link with more event ports
> > + * at runtime.
>
> I think this might need to be clarified. The device doesn't need to be
> reconfigured, but does it need to be stopped? In SW implementation, this
> affects how much we have to make things thread-safe. At minimum I think
> we should limit this to having only one thread call the function at a
> time, but we may allow enqueue dequeue ops from the data plane to run
> in parallel.
Cavium implementation can change it at runtime without re-configuring or stopping
the device to support runtime load balancing from the application perspective.
AFAIK, link establishment is _NOT_ fast path API. But the application
can invoke it from worker thread whenever there is a need for re-wiring
the queue to port connection for better explicit load balancing. IMO, A
software implementation with lock is fine here as we don't use this in
fastpath.
Thoughts?
>
> > + *
> > + * @param dev_id
> > + * The identifier of the device.
> > + *
> > + *
> > + */
> > +int
> > +rte_event_port_link(uint8_t dev_id, uint8_t port_id,
> > + const struct rte_event_queue_link link[],
> > + uint16_t nb_links);
> > +
> > +/**
> > + * Unlink multiple source event queues supplied in *queues* from the destination
> > + * event port designated by its *port_id* on the event device designated
> > + * by its *dev_id*.
> > + *
> > + * The unlink establishment shall disable the event port *port_id* from
> > + * receiving events from the specified event queue *queue_id*
> > + *
> > + * Event queue(s) to event port unlink establishment can be changed at runtime
> > + * without re-configuring the device.
>
> Clarify, as above with link call.
Same as above.
>
> > + *
next prev parent reply other threads:[~2016-12-07 18:53 UTC|newest]
Thread overview: 109+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-11-18 5:44 [dpdk-dev] [PATCH 0/4] libeventdev API and northbound implementation Jerin Jacob
2016-11-18 5:44 ` [dpdk-dev] [PATCH 1/4] eventdev: introduce event driven programming model Jerin Jacob
2016-11-23 18:39 ` Thomas Monjalon
2016-11-24 1:59 ` Jerin Jacob
2016-11-24 12:26 ` Bruce Richardson
2016-11-24 15:35 ` Thomas Monjalon
2016-11-25 0:23 ` Jerin Jacob
2016-11-25 11:00 ` Bruce Richardson
2016-11-25 13:09 ` Thomas Monjalon
2016-11-26 0:57 ` Jerin Jacob
2016-11-28 9:10 ` Bruce Richardson
2016-11-26 2:54 ` Jerin Jacob
2016-11-28 9:16 ` Bruce Richardson
2016-11-28 11:30 ` Thomas Monjalon
2016-11-29 4:01 ` Jerin Jacob
2016-11-29 10:00 ` Bruce Richardson
2016-11-25 11:59 ` Van Haaren, Harry
2016-11-25 12:09 ` Richardson, Bruce
2016-11-24 16:24 ` Bruce Richardson
2016-11-24 19:30 ` Jerin Jacob
2016-12-06 3:52 ` [dpdk-dev] [PATCH v2 0/6] libeventdev API and northbound implementation Jerin Jacob
2016-12-06 3:52 ` [dpdk-dev] [PATCH v2 1/6] eventdev: introduce event driven programming model Jerin Jacob
2016-12-06 16:51 ` Bruce Richardson
2016-12-07 18:53 ` Jerin Jacob [this message]
2016-12-08 9:30 ` Bruce Richardson
2016-12-08 20:41 ` Jerin Jacob
2016-12-09 15:11 ` Bruce Richardson
2016-12-14 6:55 ` Jerin Jacob
2016-12-07 10:57 ` Van Haaren, Harry
2016-12-08 1:24 ` Jerin Jacob
2016-12-08 11:02 ` Van Haaren, Harry
2016-12-14 13:13 ` Jerin Jacob
2016-12-14 15:15 ` Bruce Richardson
2016-12-15 16:54 ` Van Haaren, Harry
2016-12-07 11:12 ` Bruce Richardson
2016-12-08 1:48 ` Jerin Jacob
2016-12-08 9:57 ` Bruce Richardson
2016-12-14 6:40 ` Jerin Jacob
2016-12-14 15:19 ` Bruce Richardson
2016-12-15 13:39 ` Jerin Jacob
2016-12-06 3:52 ` [dpdk-dev] [PATCH v2 2/6] eventdev: define southbound driver interface Jerin Jacob
2016-12-06 3:52 ` [dpdk-dev] [PATCH v2 3/6] eventdev: implement the northbound APIs Jerin Jacob
2016-12-06 17:17 ` Bruce Richardson
2016-12-07 17:02 ` Jerin Jacob
2016-12-08 9:59 ` Bruce Richardson
2016-12-14 6:28 ` Jerin Jacob
2016-12-06 3:52 ` [dpdk-dev] [PATCH v2 4/6] eventdev: implement PMD registration functions Jerin Jacob
2016-12-06 3:52 ` [dpdk-dev] [PATCH v2 5/6] event/skeleton: add skeleton eventdev driver Jerin Jacob
2016-12-06 3:52 ` [dpdk-dev] [PATCH v2 6/6] app/test: unit test case for eventdev APIs Jerin Jacob
2016-12-06 16:46 ` [dpdk-dev] [PATCH v2 0/6] libeventdev API and northbound implementation Bruce Richardson
2016-12-21 9:25 ` [dpdk-dev] [PATCH v4 " Jerin Jacob
2016-12-21 9:25 ` [dpdk-dev] [PATCH v4 1/6] eventdev: introduce event driven programming model Jerin Jacob
2017-01-25 16:32 ` Eads, Gage
2017-01-25 16:36 ` Richardson, Bruce
2017-01-25 16:53 ` Eads, Gage
2017-01-25 22:36 ` Eads, Gage
2017-01-26 9:39 ` Jerin Jacob
2017-01-26 20:39 ` Eads, Gage
2017-01-27 10:03 ` Bruce Richardson
2017-01-30 10:42 ` Jerin Jacob
2017-02-02 11:18 ` Nipun Gupta
2017-02-02 14:09 ` Jerin Jacob
2017-02-03 6:38 ` Nipun Gupta
2017-02-03 10:58 ` Hemant Agrawal
2017-02-07 4:59 ` Jerin Jacob
2016-12-21 9:25 ` [dpdk-dev] [PATCH v4 2/6] eventdev: define southbound driver interface Jerin Jacob
2017-02-02 11:19 ` Nipun Gupta
2017-02-02 11:34 ` Bruce Richardson
2017-02-02 12:53 ` Nipun Gupta
2017-02-02 13:58 ` Bruce Richardson
2017-02-03 5:59 ` Nipun Gupta
2016-12-21 9:25 ` [dpdk-dev] [PATCH v4 3/6] eventdev: implement the northbound APIs Jerin Jacob
2017-02-02 11:19 ` Nipun Gupta
2017-02-02 14:32 ` Jerin Jacob
2017-02-03 6:59 ` Nipun Gupta
2016-12-21 9:25 ` [dpdk-dev] [PATCH v4 4/6] eventdev: implement PMD registration functions Jerin Jacob
2017-02-02 11:20 ` Nipun Gupta
2017-02-05 13:04 ` Jerin Jacob
2016-12-21 9:25 ` [dpdk-dev] [PATCH v4 5/6] event/skeleton: add skeleton eventdev driver Jerin Jacob
2016-12-21 9:25 ` [dpdk-dev] [PATCH v4 6/6] app/test: unit test case for eventdev APIs Jerin Jacob
2016-11-18 5:45 ` [dpdk-dev] [PATCH 2/4] eventdev: implement the northbound APIs Jerin Jacob
2016-11-21 17:45 ` Eads, Gage
2016-11-21 19:13 ` Jerin Jacob
2016-11-21 19:31 ` Jerin Jacob
2016-11-22 15:15 ` Eads, Gage
2016-11-22 18:19 ` Jerin Jacob
2016-11-22 19:43 ` Eads, Gage
2016-11-22 20:00 ` Jerin Jacob
2016-11-22 22:48 ` Eads, Gage
2016-11-22 23:43 ` Jerin Jacob
2016-11-28 15:53 ` Eads, Gage
2016-11-29 2:01 ` Jerin Jacob
2016-11-29 3:43 ` Jerin Jacob
2016-11-29 5:46 ` Eads, Gage
2016-11-23 9:57 ` Bruce Richardson
2016-11-23 19:18 ` Thomas Monjalon
2016-11-25 4:17 ` Jerin Jacob
2016-11-25 9:55 ` Richardson, Bruce
2016-11-25 23:08 ` Jerin Jacob
2016-11-18 5:45 ` [dpdk-dev] [PATCH 3/4] event/skeleton: add skeleton eventdev driver Jerin Jacob
2016-11-18 5:45 ` [dpdk-dev] [PATCH 4/4] app/test: unit test case for eventdev APIs Jerin Jacob
2016-11-18 15:25 ` [dpdk-dev] [PATCH 0/4] libeventdev API and northbound implementation Bruce Richardson
2016-11-18 16:04 ` Bruce Richardson
2016-11-18 19:27 ` Jerin Jacob
2016-11-21 9:40 ` Thomas Monjalon
2016-11-21 9:57 ` Bruce Richardson
2016-11-22 0:11 ` Thomas Monjalon
2016-11-22 2:00 ` Yuanhan Liu
2016-11-22 9:05 ` Shreyansh Jain
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