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From: Honnappa Nagarahalli <Honnappa.Nagarahalli@arm.com>
To: Morten Brørup <mb@smartsharesystems.com>,
	"Joyce Kong (Arm Technology China)" <Joyce.Kong@arm.com>,
	"dev@dpdk.org" <dev@dpdk.org>
Cc: nd <nd@arm.com>, "thomas@monjalon.net" <thomas@monjalon.net>,
	"jerinj@marvell.com" <jerinj@marvell.com>,
	"ravi1.kumar@amd.com" <ravi1.kumar@amd.com>,
	"xuanziyang2@huawei.com" <xuanziyang2@huawei.com>,
	"cloud.wangxiaoyun@huawei.com" <cloud.wangxiaoyun@huawei.com>,
	"zhouguoyang@huawei.com" <zhouguoyang@huawei.com>,
	"rmody@marvell.com" <rmody@marvell.com>,
	"shshaikh@marvell.com" <shshaikh@marvell.com>,
	"Gavin Hu (Arm Technology China)" <Gavin.Hu@arm.com>,
	Stephen Hemminger <stephen@networkplumber.org>,
	Honnappa Nagarahalli <Honnappa.Nagarahalli@arm.com>,
	nd <nd@arm.com>
Subject: Re: [dpdk-dev] [PATCH v1 1/5] lib/eal: implement the family of rte bitoperation APIs
Date: Wed, 23 Oct 2019 17:30:06 +0000
Message-ID: <VE1PR08MB51494E110A0219B79A51817E986B0@VE1PR08MB5149.eurprd08.prod.outlook.com> (raw)
In-Reply-To: <98CBD80474FA8B44BF855DF32C47DC35C60B96@smartserver.smartshare.dk>

> 
> > -----Original Message-----
> > From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of Joyce Kong (Arm
> > Technology China)
> > Sent: Wednesday, October 23, 2019 5:08 AM
> >
> > > > > -----Original Message-----
> > > > > From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of Joyce Kong
> > > > > Sent: Tuesday, October 15, 2019 9:50 AM
> > > > >
> > > > > There are a lot functions of bit operations scattered and
> > duplicated
> > > > > in PMDs, consolidating them into a common API family is
> > necessary.
> > > > > Furthermore, the bit operation is mostly applied to the IO
> > devices,
> > > > > so use __ATOMIC_ACQ_REL to ensure the ordering.
> > > >
> > > > Good initiative.
> > > >
> > > > >
> > > > > Signed-off-by: Joyce Kong <joyce.kong@arm.com>
> > > > > ---
> > > > >  lib/librte_eal/common/Makefile             |  1 +
> > > > >  lib/librte_eal/common/include/rte_bitops.h | 56
> > > > > ++++++++++++++++++++++++++++++
> > > > >  lib/librte_eal/common/meson.build          |  1 +
> > > > >  3 files changed, 58 insertions(+)  create mode 100644
> > > > > lib/librte_eal/common/include/rte_bitops.h
> > > > >
> > > > > diff --git a/lib/librte_eal/common/Makefile
> > > > > b/lib/librte_eal/common/Makefile index a00d4fc..8586ca8 100644
> > > > > --- a/lib/librte_eal/common/Makefile
> > > > > +++ b/lib/librte_eal/common/Makefile
> > > > > @@ -18,6 +18,7 @@ INC += rte_malloc.h rte_keepalive.h rte_time.h
> > > > > INC
> > > > > += rte_service.h rte_service_component.h  INC += rte_bitmap.h
> > > > > rte_vfio.h rte_hypervisor.h rte_test.h  INC += rte_reciprocal.h
> > > > > rte_fbarray.h rte_uuid.h
> > > > > +INC += rte_bitops.h
> > > > >
> > > > >  GENERIC_INC := rte_atomic.h rte_byteorder.h rte_cycles.h
> > > > > rte_prefetch.h  GENERIC_INC += rte_memcpy.h rte_cpuflags.h diff
> > > > > --git a/lib/librte_eal/common/include/rte_bitops.h
> > > > > b/lib/librte_eal/common/include/rte_bitops.h
> > > > > new file mode 100644
> > > > > index 0000000..4d7c5a3
> > > > > --- /dev/null
> > > > > +++ b/lib/librte_eal/common/include/rte_bitops.h
> > > > > @@ -0,0 +1,56 @@
> > > > > +/* SPDX-License-Identifier: BSD-3-Clause
> > > > > + * Copyright(c) 2019 Arm Corporation  */
> > > > > +
> > > > > +#ifndef _RTE_BITOPS_H_
> > > > > +#define _RTE_BITOPS_H_
> > > > > +
> > > > > +/**
> > > > > + * @file
> > > > > + * Bit Operations
> > > > > + *
> > > > > + * This file defines a generic API for bit operations.
> > > > > + */
> > > > > +
> > > > > +#include <stdint.h>
> > > > > +#include <rte_atomic.h>
> > > > > +
> > > > > +static inline void
> > > > > +rte_set_bit(unsigned int nr, unsigned long *addr) {
> > > > > +	__atomic_fetch_or(addr, (1UL << nr), __ATOMIC_ACQ_REL); }
> > > > > +
> > > > > +static inline void
> > > > > +rte_clear_bit(int nr, unsigned long *addr) {
> > > > > +	__atomic_fetch_and(addr, ~(1UL << nr),
> __ATOMIC_ACQ_REL); }
> > > > > +
> > > > > +static inline int
> > > > > +rte_test_bit(int nr, unsigned long *addr) {
> > > > > +	int res;
> > > > > +	rte_mb();
> > > > > +	res = ((*addr) & (1UL << nr)) != 0;
> > > > > +	rte_mb();
> > > > > +
> > > > > +	return res;
> > > > > +}
> > > >
> > > > Why does rte_test_bit() not use any of the __atomic_xx functions
> > instead?
> > > > E.g.:
> > > >
> > > > static inline int
> > > > rte_test_bit(int nr, unsigned long *addr) {
> > > > 	return __atomic_load_n(addr, __ATOMIC_ACQUIRE); }
> > > >
> > > You re right, it's better to use __atomic_xx here to keep the
> > consistent with
> > > other APIs.
> > >
> > > > > +
> > > > > +static inline int
> > > > > +rte_test_and_set_bit(int nr, unsigned long *addr) {
> > > > > +	unsigned long mask = (1UL << nr);
> > > > > +
> > > > > +	return __atomic_fetch_or(addr, mask, __ATOMIC_ACQ_REL) &
> > > > mask; }
> > > > > +
> > > > > +static inline int
> > > > > +rte_test_and_clear_bit(int nr, unsigned long *addr) {
> > > > > +	unsigned long mask = (1UL << nr);
> > > > > +
> > > > > +	return __atomic_fetch_and(addr, ~mask, __ATOMIC_ACQ_REL)
> &
> > > > mask; }
> > > > > +#endif /* _RTE_BITOPS_H_ */
> > > > > diff --git a/lib/librte_eal/common/meson.build
> > > > > b/lib/librte_eal/common/meson.build
> > > > > index 386577c..a277cdf 100644
> > > > > --- a/lib/librte_eal/common/meson.build
> > > > > +++ b/lib/librte_eal/common/meson.build
> > > > > @@ -52,6 +52,7 @@ common_headers = files(
> > > > >  	'include/rte_alarm.h',
> > > > >  	'include/rte_branch_prediction.h',
> > > > >  	'include/rte_bus.h',
> > > > > +	'include/rte_bitops.h',
> > > > >  	'include/rte_bitmap.h',
> > > > >  	'include/rte_class.h',
> > > > >  	'include/rte_common.h',
> > > > > --
> > > > > 2.7.4
> > > > >
> > > >
> > > > These functions use unsigned long as the type of their value, like
> > > > they do in the PMDs.
> > > >
> > > > However, a generic bit operations library should preferably work
> > with
> > > > multiple types, like the __atomic_xx functions. Or use an well
> > defined
> > > > uint_NN_t type. Or have individually named functions for each type
> > size,
> > > e.g.
> > > > rte_set_bit_32() and rte_set_bit_64().
> > > >
> > > Good suggestion! And will do this in next version.
> >
> > The PMDs which use the common API now are all 32bit operation, so
> > change the definition to uint_32_t type instead of individually naming
> > functions for each type size.
> 
> Unless you are certain that all current and future I/O devices only need 32 bit,
> it should provide variants for different types, like the rte_atomic_xxx API.
Why not do these using macros? The __atomic_xxx APIs anyway work with multiple types. Then we do not have to provide variants for all sizes.

> 
> There might also be a need to support both big and little endian byte ordering?
> Perhaps the CPU uses a different byte ordering than the I/O device being
> accessed through this API. I don't know; I'm only providing half baked feedback
> on this point.


  reply index

Thread overview: 92+ 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 [this message]
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
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

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