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From: Gavin Hu <Gavin.Hu@arm.com>
To: Stephen Hemminger <stephen@networkplumber.org>,
	Honnappa Nagarahalli <Honnappa.Nagarahalli@arm.com>
Cc: Joyce Kong <Joyce.Kong@arm.com>,
	"thomas@monjalon.net" <thomas@monjalon.net>,
	"david.marchand@redhat.com" <david.marchand@redhat.com>,
	"mb@smartsharesystems.com" <mb@smartsharesystems.com>,
	"jerinj@marvell.com" <jerinj@marvell.com>,
	"bruce.richardson@intel.com" <bruce.richardson@intel.com>,
	"ravi1.kumar@amd.com" <ravi1.kumar@amd.com>,
	"rmody@marvell.com" <rmody@marvell.com>,
	"shshaikh@marvell.com" <shshaikh@marvell.com>,
	"xuanziyang2@huawei.com" <xuanziyang2@huawei.com>,
	"cloud.wangxiaoyun@huawei.com" <cloud.wangxiaoyun@huawei.com>,
	"zhouguoyang@huawei.com" <zhouguoyang@huawei.com>,
	Phil Yang <Phil.Yang@arm.com>, nd <nd@arm.com>,
	"dev@dpdk.org" <dev@dpdk.org>, nd <nd@arm.com>
Subject: Re: [dpdk-dev] [PATCH v6 1/6] lib/eal: implement the family of rte bit operation APIs
Date: Mon, 30 Dec 2019 03:02:37 +0000
Message-ID: <VI1PR08MB537623547B9A80FC1CAC15E28F270@VI1PR08MB5376.eurprd08.prod.outlook.com> (raw)
In-Reply-To: <20191223083644.4de8e184@hermes.lan>

Hi Stephen, Honnappa,

> -----Original Message-----
> From: Stephen Hemminger <stephen@networkplumber.org>
> Sent: Tuesday, December 24, 2019 12:37 AM
> To: Honnappa Nagarahalli <Honnappa.Nagarahalli@arm.com>
> Cc: Joyce Kong <Joyce.Kong@arm.com>; thomas@monjalon.net;
> david.marchand@redhat.com; mb@smartsharesystems.com;
> jerinj@marvell.com; bruce.richardson@intel.com; ravi1.kumar@amd.com;
> rmody@marvell.com; shshaikh@marvell.com; xuanziyang2@huawei.com;
> cloud.wangxiaoyun@huawei.com; zhouguoyang@huawei.com; Phil Yang
> <Phil.Yang@arm.com>; Gavin Hu <Gavin.Hu@arm.com>; nd <nd@arm.com>;
> dev@dpdk.org
> Subject: Re: [PATCH v6 1/6] lib/eal: implement the family of rte bit operation
> APIs
> 
> On Mon, 23 Dec 2019 05:04:12 +0000
> Honnappa Nagarahalli <Honnappa.Nagarahalli@arm.com> wrote:
> 
> > <snip>
> >
> > >
> > > On Sat, 21 Dec 2019 16:07:23 +0000
> > > Honnappa Nagarahalli <Honnappa.Nagarahalli@arm.com> wrote:
> > >
> > > > Converting these into macros will help remove the size based duplication
> of
> > > APIs. I came up with the following macro:
> > > >
> > > > #define RTE_GET_BIT(nr, var, ret, memorder) \ ({ \
> > > >     if (sizeof(var) == sizeof(uint32_t)) { \
> > > >         uint32_t mask1 = 1U << (nr)%32; \
> > > >         ret = __atomic_load_n(&var, (memorder)) & mask1;\
> > > >     } \
> > > >     else {\
> > > >         uint64_t mask2 = 1UL << (nr)%64;\
> > > >         ret = __atomic_load_n(&var, (memorder)) & mask2;\
> > > >     } \
> > > > })
> > >
> > > Macros are more error prone. Especially because this is in exposed header
> file
> > That's another question I have. Why do we need to have these APIs in a
> public header file? These will add to the ABI burden as well. These APIs should
> be in a common-but-not-public header file. I am also not sure how helpful
> these APIs are for applications as these APIs seem to have considered
> requirements only from the PMDs.
> 
> Why do we have to wrap every C atomic builtin? What value is there in that?

The wrapping is aimed to reduce code duplication, on average 3 lines cut down to 1 line for a single core.
Overall I am thinking this bitops APIs are targeted for use by PMDs only, applications can use C11 freely.
The initial thought for the new APIs came from the idea of consolidating the scattered bit operations all over the PMDs. It is unwise to expanding to applications or libraries, as different memory orderings are required and complexity generate. 

If the use cases are limited to PMDs, a 'volatile' or a compiler barrier is sufficient therefore the number of APIs can be saved by half. 
http://inbox.dpdk.org/dev/VI1PR08MB53766C30B5CDA00FB9FCE9678F2E0@VI1PR08MB5376.eurprd08.prod.outlook.com/

Any thoughts and comments are welcome!


  reply index

Thread overview: 139+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-10-15  7:49 [dpdk-dev] [PATCH v1 0/5] implement common rte bit operation APIs in PMDs Joyce Kong
2019-10-15  7:49 ` [dpdk-dev] [PATCH v1 1/5] lib/eal: implement the family of rte bit operation APIs Joyce Kong
2019-10-15 16:53   ` Stephen Hemminger
2019-10-18  9:00     ` Joyce Kong (Arm Technology China)
2019-10-16  7:54   ` Jerin Jacob
2019-10-18  9:02     ` Joyce Kong (Arm Technology China)
2019-10-23  3:12       ` Joyce Kong (Arm Technology China)
2019-10-16 19:05   ` Stephen Hemminger
2019-10-17 13:32   ` [dpdk-dev] [PATCH v1 1/5] lib/eal: implement the family of rte bitoperation APIs Morten Brørup
2019-10-18  8:58     ` Joyce Kong (Arm Technology China)
2019-10-23  3:07       ` Joyce Kong (Arm Technology China)
2019-10-23  7:45         ` Morten Brørup
2019-10-23 17:30           ` Honnappa Nagarahalli
2019-10-24  3:38             ` Gavin Hu (Arm Technology China)
2019-11-01 13:48               ` Honnappa Nagarahalli
2019-11-03 15:45                 ` Gavin Hu (Arm Technology China)
2019-10-15  7:49 ` [dpdk-dev] [PATCH v1 2/5] net/axgbe: use common rte bit operation APIs instead Joyce Kong
2019-10-15  7:49 ` [dpdk-dev] [PATCH v1 3/5] net/bnx2x: " Joyce Kong
2019-10-15  7:50 ` [dpdk-dev] [PATCH v1 4/5] net/hinic: " Joyce Kong
2019-10-15  7:50 ` [dpdk-dev] [PATCH v1 5/5] net/qede: " Joyce Kong
2019-10-15 16:51 ` [dpdk-dev] [PATCH v1 0/5] implement common rte bit operation APIs in PMDs Stephen Hemminger
2019-10-18  9:01   ` Joyce Kong (Arm Technology China)
2019-10-23  2:54 ` [dpdk-dev] [PATCH v2 0/6] " Joyce Kong
2019-10-25 13:14   ` David Marchand
2019-10-29 16:42   ` Thomas Monjalon
2019-10-30  9:55     ` Gavin Hu (Arm Technology China)
2019-10-30 10:17       ` Thomas Monjalon
2019-10-30 12:32       ` Jerin Jacob
2019-10-30 13:02         ` Morten Brørup
2019-10-31 10:39           ` Gavin Hu (Arm Technology China)
2019-10-23  2:54 ` [dpdk-dev] [PATCH v2 1/6] lib/eal: implement the family of rte bit operation APIs Joyce Kong
2019-10-23  3:09   ` Honnappa Nagarahalli
2019-10-23  4:56   ` Jerin Jacob
2019-10-23  7:46   ` Morten Brørup
2019-10-23  2:54 ` [dpdk-dev] [PATCH v2 2/6] test/iobitops: add io bit operation test case Joyce Kong
2019-10-23  2:54 ` [dpdk-dev] [PATCH v2 3/6] net/axgbe: use common rte bit operation APIs instead Joyce Kong
2019-10-23  3:16   ` Honnappa Nagarahalli
2019-10-23  2:54 ` [dpdk-dev] [PATCH v2 4/6] net/bnx2x: " Joyce Kong
2019-10-23  2:54 ` [dpdk-dev] [PATCH v2 5/6] net/hinic: " Joyce Kong
2019-10-23  2:54 ` [dpdk-dev] [PATCH v2 6/6] net/qede: " Joyce Kong
2019-11-18 10:06 ` [dpdk-dev] [PATCH v3 0/6] implement common rte bit operation APIs in PMDs Joyce Kong
2019-11-18 10:06 ` [dpdk-dev] [PATCH v3 1/6] lib/eal: implement the family of rte bit operation APIs Joyce Kong
2019-11-18 10:52   ` [dpdk-dev] [PATCH v3 1/6] lib/eal: implement the family of rte bitoperation APIs Morten Brørup
2019-11-19  9:22     ` Joyce Kong (Arm Technology China)
2019-11-18 10:06 ` [dpdk-dev] [PATCH v3 2/6] test/bitops: add bit operation test case Joyce Kong
2019-11-18 10:06 ` [dpdk-dev] [PATCH v3 3/6] net/axgbe: use common rte bit operation APIs instead Joyce Kong
2019-11-18 10:06 ` [dpdk-dev] [PATCH v3 4/6] net/bnx2x: " Joyce Kong
2019-11-18 10:06 ` [dpdk-dev] [PATCH v3 5/6] net/qede: " Joyce Kong
2019-11-18 10:06 ` [dpdk-dev] [PATCH v3 6/6] net/hinic: " Joyce Kong
2019-11-20 10:12 ` [dpdk-dev] [PATCH v4 0/6] implement common rte bit operation APIs in PMDs Joyce Kong
2019-11-20 10:12 ` [dpdk-dev] [PATCH v4 1/6] lib/eal: implement the family of rte bit operation APIs Joyce Kong
2019-11-20 13:40   ` [dpdk-dev] [PATCH v4 1/6] lib/eal: implement the family of rte bitoperation APIs Morten Brørup
2019-11-20 10:12 ` [dpdk-dev] [PATCH v4 2/6] test/bitops: add bit operation test case Joyce Kong
2019-11-20 10:12 ` [dpdk-dev] [PATCH v4 3/6] net/axgbe: use common rte bit operation APIs instead Joyce Kong
2019-11-20 10:12 ` [dpdk-dev] [PATCH v4 4/6] net/bnx2x: " Joyce Kong
2019-11-20 10:12 ` [dpdk-dev] [PATCH v4 5/6] net/qede: " Joyce Kong
2019-11-20 10:12 ` [dpdk-dev] [PATCH v4 6/6] net/hinic: " Joyce Kong
2019-11-28  6:44 ` [dpdk-dev] [PATCH v5 0/6] implement common rte bit operation APIs in PMDs Joyce Kong
2019-11-28  6:44 ` [dpdk-dev] [PATCH v5 1/6] lib/eal: implement the family of rte bit operation APIs Joyce Kong
2019-11-28  6:44 ` [dpdk-dev] [PATCH v5 2/6] test/bitops: add bit operation test case Joyce Kong
2019-11-28  6:44 ` [dpdk-dev] [PATCH v5 3/6] net/axgbe: use common rte bit operation APIs instead Joyce Kong
2019-12-02  6:09   ` Gavin Hu (Arm Technology China)
2019-12-02  9:12     ` Thomas Monjalon
2019-12-02  9:24       ` [dpdk-dev] [PATCH v5 3/6] net/axgbe: use common rte bitoperation " Morten Brørup
2019-12-02  9:30         ` Thomas Monjalon
2019-12-02 16:53         ` Stephen Hemminger
2019-12-03  6:52           ` Gavin Hu (Arm Technology China)
2019-11-28  6:44 ` [dpdk-dev] [PATCH v5 4/6] net/bnx2x: use common rte bit operation " Joyce Kong
2019-11-28  6:44 ` [dpdk-dev] [PATCH v5 5/6] net/qede: " Joyce Kong
2019-11-28  6:44 ` [dpdk-dev] [PATCH v5 6/6] net/hinic: " Joyce Kong
2019-12-18  6:00 ` [dpdk-dev] [PATCH v6 0/6] implement common rte bit operation APIs in PMDs Joyce Kong
2019-12-18  6:55   ` Gavin Hu
2020-01-17 13:03   ` David Marchand
2019-12-18  6:00 ` [dpdk-dev] [PATCH v6 1/6] lib/eal: implement the family of rte bit operation APIs Joyce Kong
2019-12-20  6:52   ` Honnappa Nagarahalli
2019-12-21 16:07     ` Honnappa Nagarahalli
2019-12-21 18:07       ` Stephen Hemminger
2019-12-23  5:04         ` Honnappa Nagarahalli
2019-12-23 16:36           ` Stephen Hemminger
2019-12-30  3:02             ` Gavin Hu [this message]
2020-01-07  0:44               ` Honnappa Nagarahalli
2020-01-07  1:26                 ` Stephen Hemminger
2020-01-07  4:41                   ` Honnappa Nagarahalli
2020-01-07  0:41             ` Honnappa Nagarahalli
2019-12-21 18:08       ` Stephen Hemminger
2019-12-23  5:45         ` Honnappa Nagarahalli
2019-12-23  8:59       ` Jerin Jacob
2019-12-18  6:00 ` [dpdk-dev] [PATCH v6 2/6] test/bitops: add bit operation test case Joyce Kong
2019-12-18  6:00 ` [dpdk-dev] [PATCH v6 3/6] net/axgbe: use common rte bit operation APIs instead Joyce Kong
2019-12-18  6:00 ` [dpdk-dev] [PATCH v6 4/6] net/bnx2x: " Joyce Kong
2019-12-18  6:00 ` [dpdk-dev] [PATCH v6 5/6] net/qede: " Joyce Kong
2019-12-18  6:00 ` [dpdk-dev] [PATCH v6 6/6] net/hinic: " Joyce Kong
2020-03-09  9:54 ` [dpdk-dev] [PATCH v7 0/6] implement common rte bit operation APIs in PMDs Joyce Kong
2020-03-09  9:54 ` [dpdk-dev] [PATCH v7 1/6] lib/eal: implement the family of PMD bit operation APIs Joyce Kong
2020-03-09 15:50   ` Stephen Hemminger
2020-03-31 22:35   ` Thomas Monjalon
2020-04-01  8:27     ` Gavin Hu
2020-04-01  9:45       ` Thomas Monjalon
2020-04-02  7:20         ` Gavin Hu
2020-04-02  8:07           ` Thomas Monjalon
2020-04-02  8:11             ` Jerin Jacob
2020-04-02  9:02               ` Gavin Hu
2020-03-09  9:54 ` [dpdk-dev] [PATCH v7 2/6] test/pmdbitops: add PMD bit operation test case Joyce Kong
2020-03-09  9:54 ` [dpdk-dev] [PATCH v7 3/6] net/axgbe: use common rte bit operation APIs instead Joyce Kong
2020-03-09  9:54 ` [dpdk-dev] [PATCH v7 4/6] net/bnx2x: " Joyce Kong
2020-03-09  9:54 ` [dpdk-dev] [PATCH v7 5/6] net/qede: " Joyce Kong
2020-03-09  9:54 ` [dpdk-dev] [PATCH v7 6/6] net/hinic: " Joyce Kong
2020-04-16  5:38 ` [dpdk-dev] [PATCH v8 0/6] implement common bit operation APIs Joyce Kong
2020-04-16  5:38 ` [dpdk-dev] [PATCH v8 1/6] lib/eal: implement the family of " Joyce Kong
2020-04-16 18:55   ` [dpdk-dev] [PATCH v8 1/6] lib/eal: implement the family of commonbit " Morten Brørup
2020-04-17  8:18     ` Joyce Kong
2020-04-17  9:38   ` [dpdk-dev] [PATCH v8 1/6] lib/eal: implement the family of common bit " Jerin Jacob
2020-04-20  2:46     ` Joyce Kong
2020-04-16  5:38 ` [dpdk-dev] [PATCH v8 2/6] test/bitops: add bit operation test case Joyce Kong
2020-04-16  5:38 ` [dpdk-dev] [PATCH v8 3/6] net/axgbe: use common rte bit operation APIs instead Joyce Kong
2020-04-16  5:38 ` [dpdk-dev] [PATCH v8 4/6] net/bnx2x: " Joyce Kong
2020-04-16  5:38 ` [dpdk-dev] [PATCH v8 5/6] net/qede: " Joyce Kong
2020-04-16  5:38 ` [dpdk-dev] [PATCH v8 6/6] net/hinic: " Joyce Kong
2020-04-24  3:21 ` [dpdk-dev] [PATCH v9 0/6] implement common bit operation APIs Joyce Kong
2020-04-24  3:21 ` [dpdk-dev] [PATCH v9 1/6] lib/eal: implement the family of " Joyce Kong
2020-04-24  8:08   ` Thomas Monjalon
2020-04-26  2:07     ` Joyce Kong
2020-04-25 19:59   ` Thomas Monjalon
2020-04-26  7:18     ` Joyce Kong
2020-04-26  9:23       ` Thomas Monjalon
2020-04-24  3:21 ` [dpdk-dev] [PATCH v9 2/6] test/bitops: add bit operation test case Joyce Kong
2020-04-24  3:21 ` [dpdk-dev] [PATCH v9 3/6] net/axgbe: use common rte bit operation APIs instead Joyce Kong
2020-04-24  3:21 ` [dpdk-dev] [PATCH v9 4/6] net/bnx2x: " Joyce Kong
2020-04-24  3:21 ` [dpdk-dev] [PATCH v9 5/6] net/qede: " Joyce Kong
2020-04-24  3:21 ` [dpdk-dev] [PATCH v9 6/6] net/hinic: " Joyce Kong
2020-04-27  7:58 ` [dpdk-dev] [PATCH v10 0/6] implement common bit operation APIs Joyce Kong
2020-06-16 12:36   ` Thomas Monjalon
2020-04-27  7:58 ` [dpdk-dev] [PATCH v10 1/6] lib/eal: implement the family of " Joyce Kong
2020-04-27  7:58 ` [dpdk-dev] [PATCH v10 2/6] test/bitops: add bit operation test case Joyce Kong
2020-04-27  7:58 ` [dpdk-dev] [PATCH v10 3/6] net/axgbe: use common rte bit operation APIs instead Joyce Kong
2020-04-27  7:58 ` [dpdk-dev] [PATCH v10 4/6] net/bnx2x: " Joyce Kong
2020-04-27  7:58 ` [dpdk-dev] [PATCH v10 5/6] net/qede: " Joyce Kong
2020-04-27  7:58 ` [dpdk-dev] [PATCH v10 6/6] net/hinic: " Joyce Kong
2020-06-16 12:31   ` Thomas Monjalon

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