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From: "Ananyev, Konstantin" <konstantin.ananyev@intel.com>
To: "Ananyev, Konstantin" <konstantin.ananyev@intel.com>,
	Honnappa Nagarahalli <honnappa.nagarahalli@arm.com>,
	"olivier.matz@6wind.com" <olivier.matz@6wind.com>
Cc: "gavin.hu@arm.com" <gavin.hu@arm.com>,
	"dev@dpdk.org" <dev@dpdk.org>, "nd@arm.com" <nd@arm.com>
Subject: Re: [dpdk-dev] [RFC 1/1] lib/ring: add scatter gather and serial	dequeue APIs
Date: Wed, 26 Feb 2020 23:21:00 +0000
Message-ID: <SN6PR11MB255861F72AD2F8F236A739629AEA0@SN6PR11MB2558.namprd11.prod.outlook.com> (raw)
In-Reply-To: <SN6PR11MB25583DDB5F09983CCE9DB5769AEA0@SN6PR11MB2558.namprd11.prod.outlook.com>

> > +/**
> > + * @internal Reserve ring elements to enqueue several objects on the ring
> > + *
> > + * @param r
> > + *   A pointer to the ring structure.
> > + * @param esize
> > + *   The size of ring element, in bytes. It must be a multiple of 4.
> > + *   This must be the same value used while creating the ring. Otherwise
> > + *   the results are undefined.
> > + * @param n
> > + *   The number of elements to reserve in the ring.
> > + * @param behavior
> > + *   RTE_RING_QUEUE_FIXED:    Reserve a fixed number of elements from a ring
> > + *   RTE_RING_QUEUE_VARIABLE: Reserve as many elements as possible from ring
> > + * @param is_sp
> > + *   Indicates whether to use single producer or multi-producer reserve
> > + * @param old_head
> > + *   Producer's head index before reservation.
> > + * @param new_head
> > + *   Producer's head index after reservation.
> > + * @param free_space
> > + *   returns the amount of space after the reserve operation has finished.
> > + *   It is not updated if the number of reserved elements is zero.
> > + * @param dst1
> > + *   Pointer to location in the ring to copy the data.
> > + * @param n1
> > + *   Number of elements to copy at dst1
> > + * @param dst2
> > + *   In case of ring wrap around, this pointer provides the location to
> > + *   copy the remaining elements. The number of elements to copy at this
> > + *   location is equal to (number of elements reserved - n1)
> > + * @return
> > + *   Actual number of elements reserved.
> > + *   If behavior == RTE_RING_QUEUE_FIXED, this will be 0 or n only.
> > + */
> > +static __rte_always_inline unsigned int
> > +__rte_ring_do_enqueue_elem_reserve(struct rte_ring *r, unsigned int esize,
> 
> 
> I do understand the purpose of reserve, then either commit/abort for serial sync mode,
> but what is the purpose of non-serial version of reserve/commit?
> In serial  MP/MC case, after _reserve_(n) you always have to do

Typo, meant 'in on-serial MP/MP case' of course. 

> _commit_(n) - you can't reduce number of elements, or do _abort_.
> Again you cannot avoid memcpy(n) here anyhow.
> So what is the point of these functions for non-serial case?
> 
> BTW, I think it would be good to have serial version of _enqueue_ too.

  reply	other threads:[~2020-02-26 23:21 UTC|newest]

Thread overview: 69+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-02-24 20:39 [dpdk-dev] [RFC 0/1] " Honnappa Nagarahalli
2020-02-24 20:39 ` [dpdk-dev] [RFC 1/1] " Honnappa Nagarahalli
2020-02-26 20:38   ` Ananyev, Konstantin
2020-02-26 23:21     ` Ananyev, Konstantin [this message]
2020-02-28  0:18     ` Honnappa Nagarahalli
2020-03-02 18:20       ` Ananyev, Konstantin
2020-03-04 23:21         ` Honnappa Nagarahalli
2020-03-05 18:26           ` Ananyev, Konstantin
2020-03-25 20:43             ` Honnappa Nagarahalli
2020-10-06 13:29 ` [dpdk-dev] [RFC v2 0/1] lib/ring: add scatter gather APIs Honnappa Nagarahalli
2020-10-06 13:29   ` [dpdk-dev] [RFC v2 1/1] " Honnappa Nagarahalli
2020-10-07  8:27     ` Olivier Matz
2020-10-08 20:44       ` Honnappa Nagarahalli
2020-10-08 20:47         ` Honnappa Nagarahalli
2020-10-09  7:33         ` Olivier Matz
2020-10-09  8:05           ` Ananyev, Konstantin
2020-10-09 22:54             ` Honnappa Nagarahalli
2020-10-12 17:06               ` Ananyev, Konstantin
2020-10-12 16:20     ` Ananyev, Konstantin
2020-10-12 22:31       ` Honnappa Nagarahalli
2020-10-13 11:38         ` Ananyev, Konstantin
2020-10-23  4:43 ` [dpdk-dev] [PATCH v3 0/5] lib/ring: add zero copy APIs Honnappa Nagarahalli
2020-10-23  4:43   ` [dpdk-dev] [PATCH v3 1/5] test/ring: fix the memory dump size Honnappa Nagarahalli
2020-10-23 13:24     ` Ananyev, Konstantin
2020-10-23  4:43   ` [dpdk-dev] [PATCH v3 2/5] lib/ring: add zero copy APIs Honnappa Nagarahalli
2020-10-23 13:59     ` Ananyev, Konstantin
2020-10-24 15:45       ` Honnappa Nagarahalli
2020-10-23  4:43   ` [dpdk-dev] [PATCH v3 3/5] test/ring: move common function to header file Honnappa Nagarahalli
2020-10-23 14:22     ` Ananyev, Konstantin
2020-10-23 23:54       ` Honnappa Nagarahalli
2020-10-24  0:29         ` Stephen Hemminger
2020-10-24  0:31           ` Honnappa Nagarahalli
2020-10-23  4:43   ` [dpdk-dev] [PATCH v3 4/5] test/ring: add functional tests for zero copy APIs Honnappa Nagarahalli
2020-10-23 14:20     ` Ananyev, Konstantin
2020-10-23 22:47       ` Honnappa Nagarahalli
2020-10-23  4:43   ` [dpdk-dev] [PATCH v3 5/5] test/ring: add stress " Honnappa Nagarahalli
2020-10-23 14:11     ` Ananyev, Konstantin
2020-10-24 16:11 ` [dpdk-dev] [PATCH v4 0/8] lib/ring: add " Honnappa Nagarahalli
2020-10-24 16:11   ` [dpdk-dev] [PATCH v4 1/8] " Honnappa Nagarahalli
2020-10-24 16:11   ` [dpdk-dev] [PATCH v4 2/8] test/ring: move common function to header file Honnappa Nagarahalli
2020-10-24 16:11   ` [dpdk-dev] [PATCH v4 3/8] test/ring: add functional tests for zero copy APIs Honnappa Nagarahalli
2020-10-24 16:11   ` [dpdk-dev] [PATCH v4 4/8] test/ring: add stress " Honnappa Nagarahalli
2020-10-24 16:11   ` [dpdk-dev] [PATCH v4 5/8] doc/ring: add zero copy peek APIs Honnappa Nagarahalli
2020-10-24 16:11   ` [dpdk-dev] [PATCH v4 6/8] test/ring: fix the memory dump size Honnappa Nagarahalli
2020-10-24 16:11   ` [dpdk-dev] [PATCH v4 7/8] test/ring: remove unnecessary braces Honnappa Nagarahalli
2020-10-24 16:11   ` [dpdk-dev] [PATCH v4 8/8] test/ring: user uintptr_t instead of unsigned long Honnappa Nagarahalli
2020-10-24 16:18   ` [dpdk-dev] [PATCH v4 0/8] lib/ring: add zero copy APIs Honnappa Nagarahalli
2020-10-25  7:16     ` David Marchand
2020-10-25  8:14       ` Thomas Monjalon
2020-10-25  5:45 ` [dpdk-dev] [PATCH v5 " Honnappa Nagarahalli
2020-10-25  5:45   ` [dpdk-dev] [PATCH v5 1/8] " Honnappa Nagarahalli
2020-10-27 14:11     ` Ananyev, Konstantin
2020-10-25  5:45   ` [dpdk-dev] [PATCH v5 2/8] test/ring: move common function to header file Honnappa Nagarahalli
2020-10-27 13:51     ` Ananyev, Konstantin
2020-10-25  5:45   ` [dpdk-dev] [PATCH v5 3/8] test/ring: add functional tests for zero copy APIs Honnappa Nagarahalli
2020-10-25  5:45   ` [dpdk-dev] [PATCH v5 4/8] test/ring: add stress " Honnappa Nagarahalli
2020-10-25  5:45   ` [dpdk-dev] [PATCH v5 5/8] doc/ring: add zero copy peek APIs Honnappa Nagarahalli
2020-10-27 14:11     ` Ananyev, Konstantin
2020-10-29 10:52     ` David Marchand
2020-10-29 11:28       ` Ananyev, Konstantin
2020-10-29 12:35         ` David Marchand
2020-10-29 17:29           ` Honnappa Nagarahalli
2020-10-25  5:45   ` [dpdk-dev] [PATCH v5 6/8] test/ring: fix the memory dump size Honnappa Nagarahalli
2020-10-25  5:45   ` [dpdk-dev] [PATCH v5 7/8] test/ring: remove unnecessary braces Honnappa Nagarahalli
2020-10-27 14:13     ` Ananyev, Konstantin
2020-10-25  5:45   ` [dpdk-dev] [PATCH v5 8/8] test/ring: user uintptr_t instead of unsigned long Honnappa Nagarahalli
2020-10-27 14:14     ` Ananyev, Konstantin
2020-10-29 13:57   ` [dpdk-dev] [PATCH v5 0/8] lib/ring: add zero copy APIs David Marchand
2020-10-29 22:11     ` Honnappa Nagarahalli

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