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From: Honnappa Nagarahalli <Honnappa.Nagarahalli@arm.com>
To: "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>,
	"stephen@networkplumber.org" <stephen@networkplumber.org>,
	"mb@smartsharesystems.com" <mb@smartsharesystems.com>,
	"Gavin Hu (Arm Technology China)" <Gavin.Hu@arm.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>,
	Honnappa Nagarahalli <Honnappa.Nagarahalli@arm.com>,
	nd <nd@arm.com>
Subject: Re: [dpdk-dev] [PATCH v2 1/6] lib/eal: implement the family of rte bit operation APIs
Date: Wed, 23 Oct 2019 03:09:55 +0000
Message-ID: <VE1PR08MB51492E7284D1C913890B9991986B0@VE1PR08MB5149.eurprd08.prod.outlook.com> (raw)
In-Reply-To: <1571799298-18873-2-git-send-email-joyce.kong@arm.com>

Hi Joyce,
	Thanks for the patch, few comments.

<snip>

> 
> 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.
The APIs are not taking memory ordering as a parameter. This presents the same problem as the rte_atomic_xxx APIs. IMO, the APIs should take memory ordering as a parameter.

> 
> Signed-off-by: Joyce Kong <joyce.kong@arm.com>
> Reviewed-by: Gavin Hu <gavin.hu@arm.com>
> ---
>  lib/librte_eal/common/Makefile                |   1 +
>  lib/librte_eal/common/include/rte_io_bitops.h | 112
> ++++++++++++++++++++++++++
>  lib/librte_eal/common/meson.build             |   1 +
>  3 files changed, 114 insertions(+)
>  create mode 100644 lib/librte_eal/common/include/rte_io_bitops.h
> 
> diff --git a/lib/librte_eal/common/Makefile
> b/lib/librte_eal/common/Makefile index a00d4fc..3831313 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_io_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_io_bitops.h
> b/lib/librte_eal/common/include/rte_io_bitops.h
> new file mode 100644
> index 0000000..5f778b8
> --- /dev/null
> +++ b/lib/librte_eal/common/include/rte_io_bitops.h
> @@ -0,0 +1,112 @@
> +/* SPDX-License-Identifier: BSD-3-Clause
> + * Copyright(c) 2019 Arm Limited
> + */
> +
> +#ifndef _RTE_IO_BITOPS_H_
> +#define _RTE_IO_BITOPS_H_
> +
> +/**
> + * @file
> + * Bit Operations
> + *
> + * This file defines a generic API for bit operations.
> + */
> +
> +#include <rte_lcore.h>
> +
> +/**
> + * Get a bit.
> + *
> + * @param nr
> + *   The bit to get.
> + * @param addr
> + *   The address to count from.
> + * @return
> + *   The value of the bit.
> + */
> +static inline int32_t
> +rte_io_get_bit(uint32_t nr, uint64_t *addr) {
> +	return __atomic_load_n(addr, __ATOMIC_ACQUIRE) & (1UL << nr); }
Some use cases might need 'relaxed' memory order for this API. So, the user of this API should be able to provide the memory order.

> +
> +/**
> + * Set a bit to 1.
> + *
> + * @param nr
> + *   The bit to set.
> + * @param addr
> + *   The address to count from.
> + */
> +static inline void
> +rte_io_set_bit(uint32_t nr, uint64_t *addr) {
> +	__atomic_fetch_or(addr, (1UL << nr), __ATOMIC_ACQ_REL); }
Some use cases might need 'release' or 'relaxed' memory order.
Similar requirements apply to other APIs too.

> +
> +/**
> + * Set a bit to 0.
> + *
> + * @param nr
> + *   The bit to set.
> + * @param addr
> + *   The address to count from.
> + */
> +static inline void
> +rte_io_clear_bit(int32_t nr, uint64_t *addr) {
> +	__atomic_fetch_and(addr, ~(1UL << nr), __ATOMIC_ACQ_REL); }
> +
> +/**
> + * Test if a bit is 1.
> + *
> + * @param nr
> + *   The bit to test.
> + * @param addr
> + *   The address to count from.
> + * @return
> + *   1 if the bit is 1; else 0.
> + */
> +static inline int32_t
> +rte_io_test_bit(int32_t nr, uint64_t *addr) {
> +	return (__atomic_load_n(addr, __ATOMIC_ACQUIRE) & (1UL <<
> nr)) != 0; }
> +
> +/**
> + * Set a bit to 1 and return its old value.
> + *
> + * @param nr
> + *   The bit to set.
> + * @param addr
> + *   The address to count from.
> + * @return
> + *   The old value of the bit.
> + */
> +static inline int32_t
> +rte_io_test_and_set_bit(int32_t nr, uint64_t *addr) {
> +	unsigned long mask = (1UL << nr);
> +
> +	return __atomic_fetch_or(addr, mask, __ATOMIC_ACQ_REL) &
> mask; }
> +
> +/**
> + * Set a bit to 0 and return its old value.
> + *
> + * @param nr
> + *   The bit to set.
> + * @param addr
> + *   The address to count from.
> + * @return
> + *   The old value of the bit.
> + */
> +static inline int32_t
> +rte_io_test_and_clear_bit(int32_t nr, uint64_t *addr) {
> +	unsigned long mask = (1UL << nr);
> +
> +	return __atomic_fetch_and(addr, ~mask, __ATOMIC_ACQ_REL) &
> mask; }
> +#endif /* _RTE_IO_BITOPS_H_ */
> diff --git a/lib/librte_eal/common/meson.build
> b/lib/librte_eal/common/meson.build
> index 386577c..0a65d04 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_io_bitops.h',
>  	'include/rte_bitmap.h',
>  	'include/rte_class.h',
>  	'include/rte_common.h',
> --
> 2.7.4


  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
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 [this message]
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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