From: "Gavin Hu (Arm Technology China)" <Gavin.Hu@arm.com> To: "Honnappa Nagarahalli" <Honnappa.Nagarahalli@arm.com>, "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>, Stephen Hemminger <stephen@networkplumber.org>, nd <nd@arm.com>, nd <nd@arm.com> Subject: Re: [dpdk-dev] [PATCH v1 1/5] lib/eal: implement the family of rte bitoperation APIs Date: Thu, 24 Oct 2019 03:38:40 +0000 Message-ID: <AM0PR08MB53634BFB048C7E894910BC638F6A0@AM0PR08MB5363.eurprd08.prod.outlook.com> (raw) In-Reply-To: <VE1PR08MB51494E110A0219B79A51817E986B0@VE1PR08MB5149.eurprd08.prod.outlook.com> > -----Original Message----- > From: Honnappa Nagarahalli <Honnappa.Nagarahalli@arm.com> > Sent: Thursday, October 24, 2019 1:30 AM > To: Morten Brørup <mb@smartsharesystems.com>; Joyce Kong (Arm > Technology China) <Joyce.Kong@arm.com>; dev@dpdk.org > Cc: nd <nd@arm.com>; thomas@monjalon.net; jerinj@marvell.com; > ravi1.kumar@amd.com; xuanziyang2@huawei.com; > cloud.wangxiaoyun@huawei.com; zhouguoyang@huawei.com; > rmody@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 > > > > > > -----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. We really come to the point for the community to give a guideline: how to generalize APIs to support multiple-sized arguments. Looks like macros was disliked by the community, for readability and debuggability reasons. Besides macros, there are an alternative: _Generic https://gcc.gnu.org/onlinedocs/gccint/GENERIC.html, but it is not supported by older gcc(<4.9), this made a hard requirement for gcc/clang. We have to compromise over all these: code duplication, readability and debuggability. /Gavin > > > > 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. >
next prev parent 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) [this message] 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 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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