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From: Feifei Wang <Feifei.Wang2@arm.com>
To: Jerin Jacob <jerinjacobk@gmail.com>
Cc: Ruifeng Wang <Ruifeng.Wang@arm.com>, dpdk-dev <dev@dpdk.org>,
	nd <nd@arm.com>,
	"Ananyev, Konstantin" <konstantin.ananyev@intel.com>,
	Stephen Hemminger <stephen@networkplumber.org>,
	David Marchand <david.marchand@redhat.com>,
	"thomas@monjalon.net" <thomas@monjalon.net>,
	Mattias Rönnblom <mattias.ronnblom@ericsson.com>, nd <nd@arm.com>
Subject: [dpdk-dev] 回复: [PATCH v7 1/5] eal: add new definitions for wait scheme
Date: Thu, 28 Oct 2021 07:40:46 +0000
Message-ID: <DB9PR08MB6923FB43F610761CAE5EAB19C8869@DB9PR08MB6923.eurprd08.prod.outlook.com> (raw)
In-Reply-To: <CALBAE1N_XGvTDuCGOLOesM9s018CvAJ2igRM0P4AhKiZH3iBRg@mail.gmail.com>



> -----邮件原件-----
> 发件人: Jerin Jacob <jerinjacobk@gmail.com>
> 发送时间: Thursday, October 28, 2021 3:16 PM
> 收件人: Feifei Wang <Feifei.Wang2@arm.com>
> 抄送: Ruifeng Wang <Ruifeng.Wang@arm.com>; dpdk-dev <dev@dpdk.org>;
> nd <nd@arm.com>; Ananyev, Konstantin <konstantin.ananyev@intel.com>;
> Stephen Hemminger <stephen@networkplumber.org>; David Marchand
> <david.marchand@redhat.com>; thomas@monjalon.net; Mattias Rönnblom
> <mattias.ronnblom@ericsson.com>
> 主题: Re: [PATCH v7 1/5] eal: add new definitions for wait scheme
> 
> On Thu, Oct 28, 2021 at 12:26 PM Feifei Wang <feifei.wang2@arm.com>
> wrote:
> >
> > Introduce macros as generic interface for address monitoring.
> > For different size, encapsulate '__LOAD_EXC_16', '__LOAD_EXC_32'
> > and '__LOAD_EXC_64' into a new macro '__LOAD_EXC'.
> >
> > Furthermore, to prevent compilation warning in arm:
> > ----------------------------------------------
> > 'warning: implicit declaration of function ...'
> > ----------------------------------------------
> > Delete 'undef' constructions for '__LOAD_EXC_xx', '__SEVL' and '__WFE'.
> > And add ‘__RTE_ARM’ for these macros to fix the namespace.
> >
> > This is because original macros are undefine at the end of the file.
> > If new macro 'rte_wait_event' calls them in other files, they will be
> > seen as 'not defined'.
> >
> > Signed-off-by: Feifei Wang <feifei.wang2@arm.com>
> > Reviewed-by: Ruifeng Wang <ruifeng.wang@arm.com>
> > ---
> 
> > +static __rte_always_inline void
> > +rte_wait_until_equal_16(volatile uint16_t *addr, uint16_t expected,
> > +               int memorder)
> > +{
> > +       uint16_t value;
> > +
> > +       assert(memorder == __ATOMIC_ACQUIRE || memorder ==
> > + __ATOMIC_RELAXED);
> 
> Assert is not good in the library, Why not RTE_BUILD_BUG_ON here
[Feifei] This line is the original code which has nothing to do with this patch, 
I can change it in the next version.
> 
> 
> > +
> > +       __RTE_ARM_LOAD_EXC_16(addr, value, memorder)
> >         if (value != expected) {
> > -               __SEVL()
> > +                __RTE_ARM_SEVL()
> >                 do {
> > -                       __WFE()
> > -                       __LOAD_EXC_16(addr, value, memorder)
> > +                       __RTE_ARM_WFE()
> > +                       __RTE_ARM_LOAD_EXC_16(addr, value, memorder)
> >                 } while (value != expected);
> >         }
> > -#undef __LOAD_EXC_16
> >  }
> >
> >  static __rte_always_inline void
> > @@ -77,34 +124,14 @@ rte_wait_until_equal_32(volatile uint32_t *addr,
> > uint32_t expected,
> >
> >         assert(memorder == __ATOMIC_ACQUIRE || memorder ==
> > __ATOMIC_RELAXED);
> >
> > -       /*
> > -        * Atomic exclusive load from addr, it returns the 32-bit content of
> > -        * *addr while making it 'monitored',when it is written by someone
> > -        * else, the 'monitored' state is cleared and a event is generated
> > -        * implicitly to exit WFE.
> > -        */
> > -#define __LOAD_EXC_32(src, dst, memorder) {              \
> > -       if (memorder == __ATOMIC_RELAXED) {              \
> > -               asm volatile("ldxr %w[tmp], [%x[addr]]"  \
> > -                       : [tmp] "=&r" (dst)              \
> > -                       : [addr] "r"(src)                \
> > -                       : "memory");                     \
> > -       } else {                                         \
> > -               asm volatile("ldaxr %w[tmp], [%x[addr]]" \
> > -                       : [tmp] "=&r" (dst)              \
> > -                       : [addr] "r"(src)                \
> > -                       : "memory");                     \
> > -       } }
> > -
> > -       __LOAD_EXC_32(addr, value, memorder)
> > +       __RTE_ARM_LOAD_EXC_32(addr, value, memorder)
> >         if (value != expected) {
> > -               __SEVL()
> > +               __RTE_ARM_SEVL()
> >                 do {
> > -                       __WFE()
> > -                       __LOAD_EXC_32(addr, value, memorder)
> > +                       __RTE_ARM_WFE()
> > +                       __RTE_ARM_LOAD_EXC_32(addr, value, memorder)
> >                 } while (value != expected);
> >         }
> > -#undef __LOAD_EXC_32
> >  }
> >
> >  static __rte_always_inline void
> > @@ -115,38 +142,33 @@ rte_wait_until_equal_64(volatile uint64_t *addr,
> > uint64_t expected,
> >
> >         assert(memorder == __ATOMIC_ACQUIRE || memorder ==
> > __ATOMIC_RELAXED);
> 
> remove assert and change to BUILD_BUG_ON
[Feifei] OK
> 
> >
> > -       /*
> > -        * Atomic exclusive load from addr, it returns the 64-bit content of
> > -        * *addr while making it 'monitored',when it is written by someone
> > -        * else, the 'monitored' state is cleared and a event is generated
> > -        * implicitly to exit WFE.
> > -        */
> > -#define __LOAD_EXC_64(src, dst, memorder) {              \
> > -       if (memorder == __ATOMIC_RELAXED) {              \
> > -               asm volatile("ldxr %x[tmp], [%x[addr]]"  \
> > -                       : [tmp] "=&r" (dst)              \
> > -                       : [addr] "r"(src)                \
> > -                       : "memory");                     \
> > -       } else {                                         \
> > -               asm volatile("ldaxr %x[tmp], [%x[addr]]" \
> > -                       : [tmp] "=&r" (dst)              \
> > -                       : [addr] "r"(src)                \
> > -                       : "memory");                     \
> > -       } }
> > -
> > -       __LOAD_EXC_64(addr, value, memorder)
> > +       __RTE_ARM_LOAD_EXC_64(addr, value, memorder)
> >         if (value != expected) {
> > -               __SEVL()
> > +               __RTE_ARM_SEVL()
> >                 do {
> > -                       __WFE()
> > -                       __LOAD_EXC_64(addr, value, memorder)
> > +                       __RTE_ARM_WFE()
> > +                       __RTE_ARM_LOAD_EXC_64(addr, value, memorder)
> >                 } while (value != expected);
> >         }
> >  }
> > -#undef __LOAD_EXC_64
> >
> > -#undef __SEVL
> > -#undef __WFE
> > +#define rte_wait_event(addr, mask, cond, expected, memorder)              \
> > +do {                                                                      \
> > +       RTE_BUILD_BUG_ON(!__builtin_constant_p(memorder));                \
> > +       RTE_BUILD_BUG_ON(memorder != __ATOMIC_ACQUIRE &&
> \
> > +                               memorder != __ATOMIC_RELAXED);            \
> > +       uint32_t size = sizeof(*(addr)) << 3;
> 
> Add const
[Feifei] OK. 
> > +       typeof(*(addr)) expected_value = (expected);                      \
> > +       typeof(*(addr)) value = 0;
> 
> Why zero assignment
I will delete this initialization.
>                                         \
> > +       __RTE_ARM_LOAD_EXC((addr), value, memorder, size)                 \
> 
> Assert is not good in the library, Why not RTE_BUILD_BUG_ON here
[Feifei] For __RTE_ARM_LOAD_EXC, 'size' is known until code is running.
So it cannot check 'size' in the compile time and BUILD_BUG_ON doesn't work here.
> 
> 
> > +       if ((value & (mask)) cond expected_value) {                       \
> > +               __RTE_ARM_SEVL()                                          \
> > +               do {                                                      \
> > +                       __RTE_ARM_WFE()                                   \
> > +                       __RTE_ARM_LOAD_EXC((addr), value, memorder,
> > + size) \
> 
> if the address is the type of __int128_t. This logic will fail? Could you add
> 128bit support too and remove the assert from __RTE_ARM_LOAD_EXC
[Feifei] There is no 128bit case in library. And maybe there will be 128bits case, we can
add 128 path here. Now there is assert check in  __RTE_ARM_LOAD_EXC to check
whether size is '16/32/64'.
> 
> 
> > +               } while ((value & (mask)) cond expected_value);           \
> > +       }                                                                 \
> > +} while (0)
> >
> >  #endif
> >
> > diff --git a/lib/eal/include/generic/rte_pause.h
> > b/lib/eal/include/generic/rte_pause.h
> > index 668ee4a184..d0c5b5a415 100644
> > --- a/lib/eal/include/generic/rte_pause.h
> > +++ b/lib/eal/include/generic/rte_pause.h
> > @@ -111,6 +111,34 @@ rte_wait_until_equal_64(volatile uint64_t *addr,
> uint64_t expected,
> >         while (__atomic_load_n(addr, memorder) != expected)
> >                 rte_pause();
> >  }
> > +
> > +/*
> > + * Wait until *addr breaks the condition, with a relaxed memory
> > + * ordering model meaning the loads around this API can be reordered.
> > + *
> > + * @param addr
> > + *  A pointer to the memory location.
> > + * @param mask
> > + *  A mask of value bits in interest.
> > + * @param cond
> > + *  A symbol representing the condition.
> > + * @param expected
> > + *  An expected value to be in the memory location.
> > + * @param memorder
> > + *  Two different memory orders that can be specified:
> > + *  __ATOMIC_ACQUIRE and __ATOMIC_RELAXED. These map to
> > + *  C++11 memory orders with the same names, see the C++11 standard
> > +or
> > + *  the GCC wiki on atomic synchronization for detailed definition.
> > + */
> > +#define rte_wait_event(addr, mask, cond, expected, memorder)
> \
> > +do {                                                                               \
> > +       RTE_BUILD_BUG_ON(!__builtin_constant_p(memorder));
> \
> > +       RTE_BUILD_BUG_ON(memorder != __ATOMIC_ACQUIRE &&
> \
> > +                               memorder != __ATOMIC_RELAXED);                     \
> > +       typeof(*(addr)) expected_value = (expected);                               \
> > +       while ((__atomic_load_n((addr), (memorder)) & (mask)) cond
> expected_value) \
> > +               rte_pause();                                                       \
> > +} while (0)
> >  #endif
> >
> >  #endif /* _RTE_PAUSE_H_ */
> > --
> > 2.25.1
> >

  reply	other threads:[~2021-10-28  7:41 UTC|newest]

Thread overview: 113+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-02  5:32 [dpdk-dev] [RFC PATCH v1 0/5] add new API for wait until scheme Feifei Wang
2021-09-02  5:32 ` [dpdk-dev] [RFC PATCH v1 1/5] eal: " Feifei Wang
2021-09-02  5:32 ` [dpdk-dev] [RFC PATCH v1 2/5] eal: use wait until scheme for read pflock Feifei Wang
2021-09-02  5:32 ` [dpdk-dev] [RFC PATCH v1 3/5] eal: use wait until scheme for mcslock Feifei Wang
2021-09-02  5:32 ` [dpdk-dev] [RFC PATCH v1 4/5] lib/bpf: use wait until scheme for Rx/Tx iteration Feifei Wang
2021-09-02  5:32 ` [dpdk-dev] [RFC PATCH v1 5/5] lib/distributor: use wait until scheme Feifei Wang
2021-09-02 15:22 ` [dpdk-dev] [RFC PATCH v1 0/5] add new API for " Stephen Hemminger
2021-09-03  7:02   ` [dpdk-dev] 回复: " Feifei Wang
2021-09-23  9:58 ` [dpdk-dev] [RFC PATCH v2 0/5] add new definitions for wait scheme Feifei Wang
2021-09-23  9:58   ` [dpdk-dev] [RFC PATCH v2 1/5] eal: " Feifei Wang
2021-09-23  9:58   ` [dpdk-dev] [RFC PATCH v2 2/5] eal: use wait event for read pflock Feifei Wang
2021-09-23  9:59   ` [dpdk-dev] [RFC PATCH v2 3/5] eal: use wait event scheme for mcslock Feifei Wang
2021-09-23  9:59   ` [dpdk-dev] [RFC PATCH v2 4/5] lib/bpf: use wait event scheme for Rx/Tx iteration Feifei Wang
2021-09-24 18:07     ` Ananyev, Konstantin
2021-09-26  2:19       ` [dpdk-dev] 回复: " Feifei Wang
2021-09-23  9:59   ` [dpdk-dev] [RFC PATCH v2 5/5] lib/distributor: use wait event scheme Feifei Wang
2021-09-26  6:32 ` [dpdk-dev] [RFC PATCH v3 0/5] add new definitions for wait scheme Feifei Wang
2021-09-26  6:32   ` [dpdk-dev] [RFC PATCH v3 1/5] eal: " Feifei Wang
2021-10-07 16:18     ` Ananyev, Konstantin
2021-10-12  8:09       ` [dpdk-dev] 回复: " Feifei Wang
2021-10-13 15:03         ` [dpdk-dev] " Ananyev, Konstantin
2021-10-13 17:00           ` Stephen Hemminger
2021-10-14  3:14             ` [dpdk-dev] 回复: " Feifei Wang
2021-10-14  3:08           ` Feifei Wang
2021-09-26  6:32   ` [dpdk-dev] [RFC PATCH v3 2/5] eal: use wait event for read pflock Feifei Wang
2021-09-26  6:33   ` [dpdk-dev] [RFC PATCH v3 3/5] eal: use wait event scheme for mcslock Feifei Wang
2021-09-26  6:33   ` [dpdk-dev] [RFC PATCH v3 4/5] lib/bpf: use wait event scheme for Rx/Tx iteration Feifei Wang
2021-10-07 15:50     ` Ananyev, Konstantin
2021-10-07 17:40       ` Ananyev, Konstantin
2021-10-20  6:20         ` [dpdk-dev] 回复: " Feifei Wang
2021-09-26  6:33   ` [dpdk-dev] [RFC PATCH v3 5/5] lib/distributor: use wait event scheme Feifei Wang
2021-10-20  8:45   ` [dpdk-dev] [PATCH v4 0/5] add new definitions for wait scheme Feifei Wang
2021-10-20  8:45     ` [dpdk-dev] [PATCH v4 1/5] eal: " Feifei Wang
2021-10-21 16:24       ` Ananyev, Konstantin
2021-10-25  9:20         ` [dpdk-dev] 回复: " Feifei Wang
2021-10-25 14:28           ` [dpdk-dev] " Ananyev, Konstantin
2021-10-26  1:08             ` [dpdk-dev] 回复: " Feifei Wang
2021-10-22  0:10       ` [dpdk-dev] " Jerin Jacob
2021-10-25  9:30         ` [dpdk-dev] 回复: " Feifei Wang
2021-10-25  9:43           ` [dpdk-dev] " Jerin Jacob
2021-10-26  1:11             ` [dpdk-dev] 回复: " Feifei Wang
2021-10-20  8:45     ` [dpdk-dev] [PATCH v4 2/5] eal: use wait event for read pflock Feifei Wang
2021-10-20  8:45     ` [dpdk-dev] [PATCH v4 3/5] eal: use wait event scheme for mcslock Feifei Wang
2021-10-20  8:45     ` [dpdk-dev] [PATCH v4 4/5] lib/bpf: use wait event scheme for Rx/Tx iteration Feifei Wang
2021-10-20  8:45     ` [dpdk-dev] [PATCH v4 5/5] lib/distributor: use wait event scheme Feifei Wang
2021-10-26  8:01 ` [dpdk-dev] [PATCH v5 0/5] add new definitions for wait scheme Feifei Wang
2021-10-26  8:02   ` [dpdk-dev] [PATCH v5 1/5] eal: " Feifei Wang
2021-10-26  8:08     ` [dpdk-dev] 回复: " Feifei Wang
2021-10-26  9:46       ` [dpdk-dev] " Ananyev, Konstantin
2021-10-26  9:59         ` Ananyev, Konstantin
2021-10-27  6:56           ` [dpdk-dev] 回复: " Feifei Wang
2021-10-26  8:02   ` [dpdk-dev] [PATCH v5 2/5] eal: use wait event for read pflock Feifei Wang
2021-10-26  8:02   ` [dpdk-dev] [PATCH v5 3/5] eal: use wait event scheme for mcslock Feifei Wang
2021-10-26  8:02   ` [dpdk-dev] [PATCH v5 4/5] lib/bpf: use wait event scheme for Rx/Tx iteration Feifei Wang
2021-10-26  8:18     ` [dpdk-dev] 回复: " Feifei Wang
2021-10-26  9:43       ` [dpdk-dev] " Ananyev, Konstantin
2021-10-26 12:56         ` Ananyev, Konstantin
2021-10-27  7:04           ` [dpdk-dev] 回复: " Feifei Wang
2021-10-27  7:31             ` Feifei Wang
2021-10-27 14:47             ` [dpdk-dev] " Ananyev, Konstantin
2021-10-28  6:24               ` [dpdk-dev] 回复: " Feifei Wang
2021-10-26  8:02   ` [dpdk-dev] [PATCH v5 5/5] lib/distributor: use wait event scheme Feifei Wang
2021-10-27  8:10 ` [dpdk-dev] [PATCH v6 0/4] add new definitions for wait scheme Feifei Wang
2021-10-27  8:10   ` [dpdk-dev] [PATCH v6 1/4] eal: " Feifei Wang
2021-10-27  8:10   ` [dpdk-dev] [PATCH v6 2/4] eal: use wait event for read pflock Feifei Wang
2021-10-27  8:10   ` [dpdk-dev] [PATCH v6 3/4] eal: use wait event scheme for mcslock Feifei Wang
2021-10-27 11:16     ` Mattias Rönnblom
2021-10-28  6:32       ` [dpdk-dev] 回复: " Feifei Wang
2021-10-27  8:10   ` [dpdk-dev] [PATCH v6 4/4] lib/distributor: use wait event scheme Feifei Wang
2021-10-27 10:57   ` [dpdk-dev] [PATCH v6 0/4] add new definitions for wait scheme Jerin Jacob
2021-10-28  6:33     ` [dpdk-dev] 回复: " Feifei Wang
2021-10-28  6:56 ` [dpdk-dev] [PATCH v7 0/5] " Feifei Wang
2021-10-28  6:56   ` [dpdk-dev] [PATCH v7 1/5] eal: " Feifei Wang
2021-10-28  7:15     ` Jerin Jacob
2021-10-28  7:40       ` Feifei Wang [this message]
2021-10-28  7:51         ` Jerin Jacob
2021-10-28  9:27           ` [dpdk-dev] 回复: " Feifei Wang
2021-10-28 13:14     ` [dpdk-dev] " Ananyev, Konstantin
2021-10-28  6:56   ` [dpdk-dev] [PATCH v7 2/5] eal: use wait event for read pflock Feifei Wang
2021-10-28  6:56   ` [dpdk-dev] [PATCH v7 3/5] eal: use wait event scheme for mcslock Feifei Wang
2021-10-28  7:02     ` Jerin Jacob
2021-10-28  7:14       ` [dpdk-dev] 回复: " Feifei Wang
2021-10-28  6:56   ` [dpdk-dev] [PATCH v7 4/5] lib/bpf: use wait event scheme for Rx/Tx iteration Feifei Wang
2021-10-28 13:15     ` Ananyev, Konstantin
2021-10-28  6:56   ` [dpdk-dev] [PATCH v7 5/5] lib/distributor: use wait event scheme Feifei Wang
2021-10-29  8:20 ` [dpdk-dev] [PATCH v8 0/5] add new definitions for wait scheme Feifei Wang
2021-10-29  8:20   ` [dpdk-dev] [PATCH v8 1/5] eal: " Feifei Wang
2021-10-29 13:54     ` Jerin Jacob
2021-10-31  8:38     ` David Marchand
2021-11-01  2:29       ` [dpdk-dev] 回复: " Feifei Wang
2021-10-29  8:20   ` [dpdk-dev] [PATCH v8 2/5] eal: use wait event for read pflock Feifei Wang
2021-10-29 13:55     ` Jerin Jacob
2021-10-31  8:37     ` David Marchand
2021-10-29  8:20   ` [dpdk-dev] [PATCH v8 3/5] eal: use wait event scheme for mcslock Feifei Wang
2021-10-29 13:55     ` Jerin Jacob
2021-10-31  8:37     ` David Marchand
2021-10-29  8:20   ` [dpdk-dev] [PATCH v8 4/5] lib/bpf: use wait event scheme for Rx/Tx iteration Feifei Wang
2021-10-31  8:37     ` David Marchand
2021-10-29  8:20   ` [dpdk-dev] [PATCH v8 5/5] lib/distributor: use wait event scheme Feifei Wang
2021-10-29 13:58     ` Jerin Jacob
2021-10-31  8:38       ` David Marchand
2021-11-01 12:44       ` David Hunt
2021-11-01  6:00 ` [dpdk-dev] [PATCH v9 0/5] add new helper for wait scheme Feifei Wang
2021-11-01  6:00   ` [dpdk-dev] [PATCH v9 1/5] eal: add a new generic " Feifei Wang
2021-11-01  6:00   ` [dpdk-dev] [PATCH v9 2/5] pflock: use wait until scheme for read pflock Feifei Wang
2021-11-03 14:46     ` David Marchand
2021-11-04  1:24       ` [dpdk-dev] 回复: " Feifei Wang
2021-11-01  6:00   ` [dpdk-dev] [PATCH v9 3/5] mcslock: use wait until scheme for mcslock Feifei Wang
2021-11-01  6:00   ` [dpdk-dev] [PATCH v9 4/5] bpf: use wait until scheme for Rx/Tx iteration Feifei Wang
2021-11-01  6:00   ` [dpdk-dev] [PATCH v9 5/5] distributor: use wait until scheme Feifei Wang
2021-11-01 16:05     ` Pattan, Reshma
2021-11-02  2:00       ` [dpdk-dev] 回复: " Feifei Wang
2021-11-03 14:55   ` [dpdk-dev] [PATCH v9 0/5] add new helper for wait scheme David Marchand

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	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 dev dev/ http://inbox.dpdk.org/dev \
		dev@dpdk.org
	public-inbox-index dev

Example config snippet for mirrors.
Newsgroup available over NNTP:
	nntp://inbox.dpdk.org/inbox.dpdk.dev


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git