From: "Gavin Hu (Arm Technology China)" <Gavin.Hu@arm.com>
To: Stephen Hemminger <stephen@networkplumber.org>
Cc: "dev@dpdk.org" <dev@dpdk.org>,
"thomas@monjalon.net" <thomas@monjalon.net>,
"jerinj@marvell.com" <jerinj@marvell.com>,
"hemant.agrawal@nxp.com" <hemant.agrawal@nxp.com>,
"bruce.richardson@intel.com" <bruce.richardson@intel.com>,
"chaozhu@linux.vnet.ibm.com" <chaozhu@linux.vnet.ibm.com>,
Honnappa Nagarahalli <Honnappa.Nagarahalli@arm.com>,
nd <nd@arm.com>,
"gaetan.rivet@6wind.com" <gaetan.rivet@6wind.com>,
"Gavin Hu (Arm Technology China)" <Gavin.Hu@arm.com>
Subject: Re: [dpdk-dev] [RFC 1/5] eal: add the APIs to wait until equal
Date: Mon, 1 Jul 2019 07:16:39 +0000 [thread overview]
Message-ID: <VI1PR08MB3167AB1056F5B71080AF4B6D8FF90@VI1PR08MB3167.eurprd08.prod.outlook.com> (raw)
In-Reply-To: <20190630132753.3f8139f0@hermes.lan>
Hi Stephen,
> -----Original Message-----
> From: Stephen Hemminger <stephen@networkplumber.org>
> Sent: Monday, July 1, 2019 4:28 AM
> To: Gavin Hu (Arm Technology China) <Gavin.Hu@arm.com>
> Cc: dev@dpdk.org; thomas@monjalon.net; jerinj@marvell.com;
> hemant.agrawal@nxp.com; bruce.richardson@intel.com;
> chaozhu@linux.vnet.ibm.com; Honnappa Nagarahalli
> <Honnappa.Nagarahalli@arm.com>; nd <nd@arm.com>
> Subject: Re: [dpdk-dev] [RFC 1/5] eal: add the APIs to wait until equal
>
> On Mon, 1 Jul 2019 00:21:12 +0800
> Gavin Hu <gavin.hu@arm.com> wrote:
>
> > +#ifdef RTE_USE_WFE
> > +#define rte_wait_until_equal_relaxed(addr, expected) do {\
> > + typeof(*addr) tmp; \
> > + if (__builtin_constant_p((expected))) \
> > + do { \
> > + if (sizeof(*(addr)) == 16)\
> > + asm volatile( \
> > + "sevl\n" \
> > + "1: wfe\n" \
> > + "ldxrh %w0, %1\n" \
> > + "cmp %w0, %w2\n" \
> > + "bne 1b\n" \
> > + : "=&r"(tmp) \
> > + : "Q"(*addr), "i"(expected) \
> > + : "cc", "memory"); \
> > + else if (sizeof(*(addr)) == 32)\
> > + asm volatile( \
> > + "sevl\n" \
> > + "1: wfe\n" \
> > + "ldxr %w0, %1\n" \
> > + "cmp %w0, %w2\n" \
> > + "bne 1b\n" \
> > + : "=&r"(tmp) \
> > + : "Q"(*addr), "i"(expected) \
> > + : "cc", "memory"); \
> > + else if (sizeof(*(addr)) == 64)\
> > + asm volatile( \
> > + "sevl\n" \
> > + "1: wfe\n" \
> > + "ldxr %x0, %1\n" \
> > + "cmp %x0, %x2\n" \
> > + "bne 1b\n" \
> > + : "=&r" (tmp) \
> > + : "Q"(*addr), "i"(expected) \
> > + : "cc", "memory"); \
> > + } while (0); \
> > + else \
> > + do { \
> > + if (sizeof(*(addr)) == 16)\
> > + asm volatile( \
> > + "sevl\n" \
> > + "1: wfe\n" \
> > + "ldxrh %w0, %1\n" \
> > + "cmp %w0, %w2\n" \
> > + "bne 1b\n" \
> > + : "=&r"(tmp) \
> > + : "Q"(*addr), "r"(expected) \
> > + : "cc", "memory"); \
> > + else if (sizeof(*(addr)) == 32)\
> > + asm volatile( \
> > + "sevl\n" \
> > + "1: wfe\n" \
> > + "ldxr %w0, %1\n" \
> > + "cmp %w0, %w2\n" \
> > + "bne 1b\n" \
> > + : "=&r"(tmp) \
> > + : "Q"(*addr), "r"(expected) \
> > + : "cc", "memory"); \
> > + else if (sizeof(*(addr)) == 64)\
> > + asm volatile( \
> > + "sevl\n" \
> > + "1: wfe\n" \
> > + "ldxr %x0, %1\n" \
> > + "cmp %x0, %x2\n" \
> > + "bne 1b\n" \
> > + : "=&r" (tmp) \
> > + : "Q"(*addr), "r"(expected) \
> > + : "cc", "memory"); \
> > + } while (0); \
> > +} while (0)
>
> That is a hot mess.
> Macro's are harder to maintain and offer no benefit over inline functions.
During our internal review, I ever used C11 _Generic to generalize the API to take different types of arguments.
That makes the API look much simpler and better, but it poses a hard requirement for C11 and gcc 4.9+.
That means, Gaetan's patch, as shown below, has to be reverted, otherwise there are compiling errors.
https://gcc.gnu.org/wiki/C11Status
$ git show ea7726a6
commit ea7726a6ee4b2b63313c4a198522a8dcea70c13d
Author: Gaetan Rivet <gaetan.rivet@6wind.com>
Date: Thu Jul 20 14:27:53 2017 +0200
net/failsafe: fix build on FreeBSD 10 with GCC 4.8
diff --git a/drivers/net/failsafe/Makefile b/drivers/net/failsafe/Makefile
index 32aaaa2..d516d36 100644
--- a/drivers/net/failsafe/Makefile
+++ b/drivers/net/failsafe/Makefile
@@ -50,7 +50,7 @@ SRCS-$(CONFIG_RTE_LIBRTE_PMD_FAILSAFE) += failsafe_flow.c
# No exported include files
# Basic CFLAGS:
-CFLAGS += -std=c11 -Wextra
+CFLAGS += -std=gnu99 -Wextra
next prev parent reply other threads:[~2019-07-01 7:16 UTC|newest]
Thread overview: 168+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-06-30 16:21 [dpdk-dev] [RFC 0/5] use WFE for locks and ring on aarch64 Gavin Hu
2019-06-30 16:21 ` [dpdk-dev] [RFC 1/5] eal: add the APIs to wait until equal Gavin Hu
2019-06-30 20:27 ` Stephen Hemminger
2019-07-01 7:16 ` Gavin Hu (Arm Technology China) [this message]
2019-07-01 7:43 ` Thomas Monjalon
2019-07-02 14:07 ` Gavin Hu (Arm Technology China)
2019-07-01 9:58 ` Pavan Nikhilesh Bhagavatula
2019-07-02 14:08 ` Gavin Hu (Arm Technology China)
2019-06-30 16:21 ` [dpdk-dev] [RFC 2/5] ticketlock: use new API to reduce contention on aarch64 Gavin Hu
2019-06-30 16:21 ` [dpdk-dev] [RFC 3/5] ring: use wfe to wait for ring tail update " Gavin Hu
2019-06-30 16:21 ` [dpdk-dev] [RFC 4/5] spinlock: use wfe to reduce contention " Gavin Hu
2019-06-30 16:21 ` [dpdk-dev] [RFC 5/5] config: add WFE config entry for aarch64 Gavin Hu
2019-06-30 20:29 ` [dpdk-dev] [RFC 0/5] use WFE for locks and ring on aarch64 Stephen Hemminger
2019-07-01 9:12 ` Gavin Hu (Arm Technology China)
2019-07-03 8:58 ` [dpdk-dev] [RFC v2 " Gavin Hu
2019-07-03 8:58 ` [dpdk-dev] [RFC v2 1/5] eal: add the APIs to wait until equal Gavin Hu
2019-07-20 6:46 ` [dpdk-dev] [EXT] " Pavan Nikhilesh Bhagavatula
2019-07-03 8:58 ` [dpdk-dev] [RFC v2 2/5] ticketlock: use new API to reduce contention on aarch64 Gavin Hu
2019-07-20 6:57 ` Pavan Nikhilesh Bhagavatula
2019-07-03 8:58 ` [dpdk-dev] [RFC v2 3/5] ring: use wfe to wait for ring tail update " Gavin Hu
2019-07-03 8:58 ` [dpdk-dev] [RFC v2 4/5] spinlock: use wfe to reduce contention " Gavin Hu
2019-07-20 6:59 ` Pavan Nikhilesh Bhagavatula
2019-07-03 8:58 ` [dpdk-dev] [RFC v2 5/5] config: add WFE config entry for aarch64 Gavin Hu
2019-07-20 7:03 ` Pavan Nikhilesh Bhagavatula
2019-07-23 15:47 ` Gavin Hu (Arm Technology China)
2019-07-23 15:43 ` [dpdk-dev] [PATCH v3 0/5] use WFE for locks and ring on aarch64 Gavin Hu
2019-07-23 19:15 ` Honnappa Nagarahalli
2019-07-23 21:27 ` Thomas Monjalon
2019-07-24 2:44 ` Honnappa Nagarahalli
2019-07-24 7:43 ` Thomas Monjalon
2019-07-23 15:43 ` [dpdk-dev] [PATCH v3 1/5] eal: add the APIs to wait until equal Gavin Hu
2019-07-24 11:52 ` [dpdk-dev] [EXT] " Jerin Jacob Kollanukkaran
2019-07-24 18:10 ` Gavin Hu (Arm Technology China)
2019-07-23 15:43 ` [dpdk-dev] [PATCH v3 2/5] ticketlock: use new API to reduce contention on aarch64 Gavin Hu
2019-07-23 15:43 ` [dpdk-dev] [PATCH v3 3/5] ring: use wfe to wait for ring tail update " Gavin Hu
2019-07-23 15:43 ` [dpdk-dev] [PATCH v3 4/5] spinlock: use wfe to reduce contention " Gavin Hu
2019-07-24 12:17 ` [dpdk-dev] [EXT] " Jerin Jacob Kollanukkaran
2019-07-23 15:43 ` [dpdk-dev] [PATCH v3 5/5] config: add WFE config entry for aarch64 Gavin Hu
2019-07-23 18:05 ` Stephen Hemminger
2019-07-23 19:10 ` Honnappa Nagarahalli
2019-07-24 17:59 ` Gavin Hu (Arm Technology China)
2019-07-24 12:25 ` [dpdk-dev] [EXT] " Jerin Jacob Kollanukkaran
2019-08-22 6:12 ` [dpdk-dev] [PATCH v4 0/6] use WFE for locks and ring on aarch64 Gavin Hu
2019-10-16 8:08 ` David Marchand
2019-10-24 20:26 ` David Christensen
2019-08-22 6:12 ` [dpdk-dev] [PATCH v4 1/6] bus/fslmc: fix the conflicting dmb function Gavin Hu
2019-08-22 6:12 ` [dpdk-dev] [PATCH v4 2/6] eal: add the APIs to wait until equal Gavin Hu
2019-09-11 12:26 ` Jerin Jacob
2019-09-12 8:25 ` Gavin Hu (Arm Technology China)
2019-08-22 6:12 ` [dpdk-dev] [PATCH v4 3/6] ticketlock: use new API to reduce contention on aarch64 Gavin Hu
2019-08-22 6:12 ` [dpdk-dev] [PATCH v4 4/6] ring: use wfe to wait for ring tail update " Gavin Hu
2019-08-22 6:12 ` [dpdk-dev] [PATCH v4 5/6] spinlock: use wfe to reduce contention " Gavin Hu
[not found] ` <CY4PR1801MB1863AF9695BB10930E817D78DEB00@CY4PR1801MB1863.namprd18.prod.outlook.com>
[not found] ` <VI1PR08MB5376BEBCC1FD1E03F0B8A8848FB00@VI1PR08MB5376.eurprd08.prod.outlook.com>
2019-09-14 15:21 ` [dpdk-dev] [EXT] " Gavin Hu (Arm Technology China)
2019-08-22 6:12 ` [dpdk-dev] [PATCH v4 6/6] config: add WFE config entry for aarch64 Gavin Hu
2019-09-12 11:24 ` [dpdk-dev] [PATCH v5 0/8] use WFE " Gavin Hu
2019-09-12 11:24 ` [dpdk-dev] [PATCH v5 1/8] config: add WFE config entry " Gavin Hu
2019-09-12 15:48 ` Jerin Jacob
2019-09-13 16:01 ` Gavin Hu (Arm Technology China)
2019-09-12 11:24 ` [dpdk-dev] [PATCH v5 2/8] bus/fslmc: fix the conflicting dmb function Gavin Hu
2019-09-12 11:24 ` [dpdk-dev] [PATCH v5 3/8] eal: add the APIs to wait until equal Gavin Hu
2019-09-12 16:11 ` Jerin Jacob
2019-09-13 17:05 ` Gavin Hu (Arm Technology China)
2019-09-12 11:24 ` [dpdk-dev] [PATCH v5 4/8] spinlock: use wfe to reduce contention on aarch64 Gavin Hu
2019-09-12 11:24 ` [dpdk-dev] [PATCH v5 5/8] ticketlock: use new API " Gavin Hu
2019-09-12 16:14 ` Jerin Jacob
2019-09-12 11:24 ` [dpdk-dev] [PATCH v5 6/8] ring: use wfe to wait for ring tail update " Gavin Hu
2019-09-12 11:24 ` [dpdk-dev] [PATCH v5 7/8] net/thunderx: use new API to save cycles " Gavin Hu
2019-09-12 16:15 ` Jerin Jacob
2019-09-12 11:24 ` [dpdk-dev] [PATCH v5 8/8] event/opdl: " Gavin Hu
2019-09-12 16:16 ` Jerin Jacob
2019-09-14 14:59 ` [dpdk-dev] [PATCH v6 0/7] use WFE for aarch64 Gavin Hu
2019-09-26 13:41 ` Jerin Jacob
2019-09-27 5:45 ` Gavin Hu (Arm Technology China)
2019-09-14 14:59 ` [dpdk-dev] [PATCH v6 1/7] bus/fslmc: fix the conflicting dmb function Gavin Hu
2019-09-14 14:59 ` [dpdk-dev] [PATCH v6 2/7] eal: add the APIs to wait until equal Gavin Hu
2019-09-14 14:59 ` [dpdk-dev] [PATCH v6 3/7] spinlock: use wfe to reduce contention on aarch64 Gavin Hu
2019-09-14 14:59 ` [dpdk-dev] [PATCH v6 4/7] ticketlock: use new API " Gavin Hu
2019-09-14 14:59 ` [dpdk-dev] [PATCH v6 5/7] ring: use wfe to wait for ring tail update " Gavin Hu
2019-09-14 14:59 ` [dpdk-dev] [PATCH v6 6/7] net/thunderx: use new API to save cycles " Gavin Hu
2019-09-14 14:59 ` [dpdk-dev] [PATCH v6 7/7] event/opdl: " Gavin Hu
2019-09-27 5:41 ` [dpdk-dev] [PATCH v7 0/7] use WFE for aarch64 Gavin Hu
2019-10-17 18:37 ` David Marchand
2019-09-27 5:41 ` [dpdk-dev] [PATCH v7 1/7] bus/fslmc: fix the conflicting dmb function Gavin Hu
2019-09-27 8:24 ` Hemant Agrawal
2019-10-17 15:06 ` David Marchand
2019-09-27 5:41 ` [dpdk-dev] [PATCH v7 2/7] eal: add the APIs to wait until equal Gavin Hu
2019-09-27 11:03 ` Jerin Jacob
2019-10-17 13:14 ` Ananyev, Konstantin
2019-10-21 7:21 ` Gavin Hu (Arm Technology China)
2019-10-17 15:45 ` David Marchand
2019-10-21 7:38 ` Gavin Hu (Arm Technology China)
2019-10-21 19:17 ` David Marchand
2019-10-17 16:44 ` Ananyev, Konstantin
2019-10-23 16:20 ` Gavin Hu (Arm Technology China)
2019-10-23 16:29 ` Gavin Hu (Arm Technology China)
2019-10-24 10:21 ` Ananyev, Konstantin
2019-10-24 10:52 ` Gavin Hu (Arm Technology China)
2019-09-27 5:41 ` [dpdk-dev] [PATCH v7 3/7] spinlock: use wfe to reduce contention on aarch64 Gavin Hu
2019-10-17 18:27 ` David Marchand
2019-10-18 5:45 ` Gavin Hu (Arm Technology China)
2019-10-21 7:27 ` Gavin Hu (Arm Technology China)
2019-09-27 5:41 ` [dpdk-dev] [PATCH v7 4/7] ticketlock: use new API " Gavin Hu
2019-09-27 5:41 ` [dpdk-dev] [PATCH v7 5/7] ring: use wfe to wait for ring tail update " Gavin Hu
2019-09-27 5:41 ` [dpdk-dev] [PATCH v7 6/7] net/thunderx: use new API to save cycles " Gavin Hu
2019-09-27 5:41 ` [dpdk-dev] [PATCH v7 7/7] event/opdl: " Gavin Hu
2019-10-21 9:47 ` [dpdk-dev] [PATCH v8 0/6] use WFE for aarch64 Gavin Hu
2019-10-21 9:47 ` [dpdk-dev] [PATCH v8 1/6] bus/fslmc: fix the conflicting dmb function Gavin Hu
2019-10-21 19:00 ` David Marchand
2019-10-21 9:47 ` [dpdk-dev] [PATCH v8 2/6] eal: add the APIs to wait until equal Gavin Hu
2019-10-21 19:19 ` David Marchand
2019-10-22 9:36 ` Ananyev, Konstantin
2019-10-22 10:17 ` David Marchand
2019-10-22 16:05 ` Gavin Hu (Arm Technology China)
2019-10-22 16:03 ` Gavin Hu (Arm Technology China)
2019-10-21 9:47 ` [dpdk-dev] [PATCH v8 3/6] spinlock: use wfe to reduce contention on aarch64 Gavin Hu
2019-10-21 9:47 ` [dpdk-dev] [PATCH v8 4/6] ticketlock: use new API " Gavin Hu
2019-10-21 9:47 ` [dpdk-dev] [PATCH v8 5/6] net/thunderx: use new API to save cycles " Gavin Hu
2019-10-21 9:47 ` [dpdk-dev] [PATCH v8 6/6] event/opdl: " Gavin Hu
2019-10-24 10:42 ` [dpdk-dev] [PATCH v9 0/5] use WFE for aarch64 Gavin Hu
2019-10-24 10:42 ` [dpdk-dev] [PATCH v9 1/5] bus/fslmc: fix the conflicting dmb function Gavin Hu
2019-10-24 10:42 ` [dpdk-dev] [PATCH v9 2/5] eal: add the APIs to wait until equal Gavin Hu
2019-10-24 13:52 ` Ananyev, Konstantin
2019-10-24 13:57 ` Ananyev, Konstantin
2019-10-24 17:00 ` Gavin Hu (Arm Technology China)
2019-10-24 10:42 ` [dpdk-dev] [PATCH v9 3/5] ticketlock: use new API to reduce contention on aarch64 Gavin Hu
2019-10-24 10:42 ` [dpdk-dev] [PATCH v9 4/5] net/thunderx: use new API to save cycles " Gavin Hu
2019-10-24 10:42 ` [dpdk-dev] [PATCH v9 5/5] event/opdl: " Gavin Hu
2019-10-25 15:39 ` [dpdk-dev] [PATCH v10 0/5] use WFE for aarch64 Gavin Hu
2019-10-25 15:39 ` [dpdk-dev] [PATCH v10 1/5] bus/fslmc: fix the conflicting dmb function Gavin Hu
2019-10-25 15:39 ` [dpdk-dev] [PATCH v10 2/5] eal: add the APIs to wait until equal Gavin Hu
2019-10-25 17:27 ` Ananyev, Konstantin
2019-10-27 13:03 ` Gavin Hu (Arm Technology China)
2019-10-25 15:39 ` [dpdk-dev] [PATCH v10 3/5] ticketlock: use new API to reduce contention on aarch64 Gavin Hu
2019-10-25 15:39 ` [dpdk-dev] [PATCH v10 4/5] net/thunderx: use new API to save cycles " Gavin Hu
2019-10-25 15:39 ` [dpdk-dev] [PATCH v10 5/5] event/opdl: " Gavin Hu
2019-10-27 12:52 ` [dpdk-dev] [PATCH v11 0/5] use WFE for aarch64 Gavin Hu
2019-10-27 12:52 ` [dpdk-dev] [PATCH v11 1/5] bus/fslmc: fix the conflicting dmb function Gavin Hu
2019-10-27 12:52 ` [dpdk-dev] [PATCH v11 2/5] eal: add the APIs to wait until equal Gavin Hu
2019-10-27 20:49 ` David Marchand
2019-10-28 5:08 ` Gavin Hu (Arm Technology China)
2019-10-27 22:19 ` Ananyev, Konstantin
2019-10-28 5:04 ` Gavin Hu (Arm Technology China)
2019-10-27 12:52 ` [dpdk-dev] [PATCH v11 3/5] ticketlock: use new API to reduce contention on aarch64 Gavin Hu
2019-10-27 12:52 ` [dpdk-dev] [PATCH v11 4/5] net/thunderx: use new API to save cycles " Gavin Hu
2019-10-27 12:52 ` [dpdk-dev] [PATCH v11 5/5] event/opdl: " Gavin Hu
2019-11-04 15:32 ` [dpdk-dev] [PATCH v12 0/5] use WFE for aarch64 Gavin Hu
2019-11-04 15:32 ` [dpdk-dev] [PATCH v12 1/5] bus/fslmc: fix the conflicting dmb function Gavin Hu
2019-11-04 15:32 ` [dpdk-dev] [PATCH v12 2/5] eal: add the APIs to wait until equal Gavin Hu
2019-11-07 15:03 ` Ananyev, Konstantin
2019-11-04 15:32 ` [dpdk-dev] [PATCH v12 3/5] ticketlock: use new API to reduce contention on aarch64 Gavin Hu
2019-11-04 15:32 ` [dpdk-dev] [PATCH v12 4/5] net/thunderx: use new API to save cycles " Gavin Hu
2019-11-04 15:32 ` [dpdk-dev] [PATCH v12 5/5] event/opdl: " Gavin Hu
2019-11-07 21:35 ` [dpdk-dev] [PATCH v13 0/5] use WFE for aarch64 David Marchand
2019-11-07 21:35 ` [dpdk-dev] [PATCH v13 1/5] bus/fslmc: fix the conflicting dmb function David Marchand
2019-12-10 6:13 ` Honnappa Nagarahalli
2019-11-07 21:35 ` [dpdk-dev] [PATCH v13 2/5] eal: add the APIs to wait until equal David Marchand
2019-11-08 16:38 ` Ananyev, Konstantin
2019-11-08 17:00 ` Thomas Monjalon
2019-11-08 18:36 ` Ananyev, Konstantin
2019-11-11 5:11 ` Jerin Jacob
2019-11-11 5:51 ` Gavin Hu (Arm Technology China)
2019-12-10 7:51 ` Honnappa Nagarahalli
2020-01-16 21:38 ` David Marchand
2020-01-17 2:46 ` Gavin Hu
2019-11-07 21:35 ` [dpdk-dev] [PATCH v13 3/5] ticketlock: use new API to reduce contention on aarch64 David Marchand
2019-11-07 21:35 ` [dpdk-dev] [PATCH v13 4/5] net/thunderx: use new API to save cycles " David Marchand
2019-11-07 21:35 ` [dpdk-dev] [PATCH v13 5/5] event/opdl: " David Marchand
2020-01-17 11:15 ` [dpdk-dev] [PATCH v13 0/5] use WFE for aarch64 David Marchand
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