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From: Phil Yang <Phil.Yang@arm.com>
To: David Marchand <david.marchand@redhat.com>
Cc: dev <dev@dpdk.org>,
	Honnappa Nagarahalli <Honnappa.Nagarahalli@arm.com>,
	Ruifeng Wang <Ruifeng.Wang@arm.com>, nd <nd@arm.com>,
	Bruce Richardson <bruce.richardson@intel.com>, nd <nd@arm.com>
Subject: Re: [dpdk-dev] [PATCH v2 1/4] eal: use C11 atomic builtins for already initialized check
Date: Thu, 24 Sep 2020 03:44:20 +0000
Message-ID: <DB7PR08MB3865AFB2F5D7CEDAD447BD09E9390@DB7PR08MB3865.eurprd08.prod.outlook.com> (raw)
In-Reply-To: <CAJFAV8xJ6em=wonORV2zdDgrJSQ8XdcdBcyFZ-r0X-UkOf_4aA@mail.gmail.com>

David Marchand <david.marchand@redhat.com> writes:

> Subject: Re: [PATCH v2 1/4] eal: use C11 atomic builtins for already initialized
> check
> 
> On Wed, Sep 16, 2020 at 10:24 AM Phil Yang <phil.yang@arm.com> wrote:
> >
> > Since rte_atomicXX APIs are not allowed to be used, use C11 builtins to
> > check if EAL is already initialized.
> >
> > Signed-off-by: Phil Yang <phil.yang@arm.com>
> > Reviewed-by: Honnappa Nagarahalli <honnappa.nagarahalli@arm.com>
> > Reviewed-by: Ruifeng Wang <ruifeng.wang@arm.com>
> > ---
> >  lib/librte_eal/freebsd/eal.c | 18 ++++++++++--------
> >  lib/librte_eal/linux/eal.c   | 20 +++++++++++---------
> >  2 files changed, 21 insertions(+), 17 deletions(-)
> >
> > diff --git a/lib/librte_eal/freebsd/eal.c b/lib/librte_eal/freebsd/eal.c
> > index 798add0..9f4c7bb 100644
> > --- a/lib/librte_eal/freebsd/eal.c
> > +++ b/lib/librte_eal/freebsd/eal.c
> > @@ -665,7 +665,8 @@ rte_eal_init(int argc, char **argv)
> >  {
> >         int i, fctret, ret;
> >         pthread_t thread_id;
> > -       static rte_atomic32_t run_once = RTE_ATOMIC32_INIT(0);
> > +       static uint32_t run_once;
> > +       uint32_t has_run = 0;
> >         char cpuset[RTE_CPU_AFFINITY_STR_LEN];
> >         char thread_name[RTE_MAX_THREAD_NAME_LEN];
> >         const struct rte_config *config = rte_eal_get_configuration();
> > @@ -679,7 +680,8 @@ rte_eal_init(int argc, char **argv)
> >                 return -1;
> >         }
> >
> > -       if (!rte_atomic32_test_and_set(&run_once)) {
> > +       if (!__atomic_compare_exchange_n(&run_once, &has_run, 1, 0,
> > +                                       __ATOMIC_RELAXED, __ATOMIC_RELAXED)) {
> >                 rte_eal_init_alert("already called initialization.");
> >                 rte_errno = EALREADY;
> >                 return -1;
> > @@ -705,7 +707,7 @@ rte_eal_init(int argc, char **argv)
> >         if (fctret < 0) {
> >                 rte_eal_init_alert("Invalid 'command line' arguments.");
> >                 rte_errno = EINVAL;
> > -               rte_atomic32_clear(&run_once);
> > +               __atomic_store_n(&run_once, 0, __ATOMIC_RELAXED);
> >                 return -1;
> >         }
> >
> > @@ -715,20 +717,20 @@ rte_eal_init(int argc, char **argv)
> >         if (eal_plugins_init() < 0) {
> >                 rte_eal_init_alert("Cannot init plugins");
> >                 rte_errno = EINVAL;
> > -               rte_atomic32_clear(&run_once);
> > +               __atomic_store_n(&run_once, 0, __ATOMIC_RELAXED);
> >                 return -1;
> >         }
> >
> >         if (eal_trace_init() < 0) {
> >                 rte_eal_init_alert("Cannot init trace");
> >                 rte_errno = EFAULT;
> > -               rte_atomic32_clear(&run_once);
> > +               __atomic_store_n(&run_once, 0, __ATOMIC_RELAXED);
> >                 return -1;
> >         }
> >
> >         if (eal_option_device_parse()) {
> >                 rte_errno = ENODEV;
> > -               rte_atomic32_clear(&run_once);
> > +               __atomic_store_n(&run_once, 0, __ATOMIC_RELAXED);
> >                 return -1;
> >         }
> >
> > @@ -762,7 +764,7 @@ rte_eal_init(int argc, char **argv)
> >         if (rte_bus_scan()) {
> >                 rte_eal_init_alert("Cannot scan the buses for devices");
> >                 rte_errno = ENODEV;
> > -               rte_atomic32_clear(&run_once);
> > +               __atomic_store_n(&run_once, 0, __ATOMIC_RELAXED);
> >                 return -1;
> >         }
> >
> > @@ -790,7 +792,7 @@ rte_eal_init(int argc, char **argv)
> >                 if (ret < 0) {
> >                         rte_eal_init_alert("Cannot get hugepage information.");
> >                         rte_errno = EACCES;
> > -                       rte_atomic32_clear(&run_once);
> > +                       __atomic_store_n(&run_once, 0, __ATOMIC_RELAXED);
> >                         return -1;
> >                 }
> >         }
> > diff --git a/lib/librte_eal/linux/eal.c b/lib/librte_eal/linux/eal.c
> > index 0960f01..82a73ed 100644
> > --- a/lib/librte_eal/linux/eal.c
> > +++ b/lib/librte_eal/linux/eal.c
> > @@ -960,7 +960,8 @@ rte_eal_init(int argc, char **argv)
> >  {
> >         int i, fctret, ret;
> >         pthread_t thread_id;
> > -       static rte_atomic32_t run_once = RTE_ATOMIC32_INIT(0);
> > +       static uint32_t run_once;
> > +       uint32_t has_run = 0;
> >         const char *p;
> >         static char logid[PATH_MAX];
> >         char cpuset[RTE_CPU_AFFINITY_STR_LEN];
> > @@ -977,7 +978,8 @@ rte_eal_init(int argc, char **argv)
> >                 return -1;
> >         }
> >
> > -       if (!rte_atomic32_test_and_set(&run_once)) {
> > +       if (!__atomic_compare_exchange_n(&run_once, &has_run, 1, 0,
> > +                                       __ATOMIC_RELAXED, __ATOMIC_RELAXED)) {
> >                 rte_eal_init_alert("already called initialization.");
> >                 rte_errno = EALREADY;
> >                 return -1;
> > @@ -1005,14 +1007,14 @@ rte_eal_init(int argc, char **argv)
> >         if (fctret < 0) {
> >                 rte_eal_init_alert("Invalid 'command line' arguments.");
> >                 rte_errno = EINVAL;
> > -               rte_atomic32_clear(&run_once);
> > +               __atomic_store_n(&run_once, 0, __ATOMIC_RELAXED);
> >                 return -1;
> >         }
> >
> >         if (eal_plugins_init() < 0) {
> >                 rte_eal_init_alert("Cannot init plugins");
> >                 rte_errno = EINVAL;
> > -               rte_atomic32_clear(&run_once);
> > +               __atomic_store_n(&run_once, 0, __ATOMIC_RELAXED);
> >                 return -1;
> >         }
> >
> > @@ -1024,7 +1026,7 @@ rte_eal_init(int argc, char **argv)
> >
> >         if (eal_option_device_parse()) {
> >                 rte_errno = ENODEV;
> > -               rte_atomic32_clear(&run_once);
> > +               __atomic_store_n(&run_once, 0, __ATOMIC_RELAXED);
> >                 return -1;
> >         }
> >
> > @@ -1064,7 +1066,7 @@ rte_eal_init(int argc, char **argv)
> >         if (rte_bus_scan()) {
> >                 rte_eal_init_alert("Cannot scan the buses for devices");
> >                 rte_errno = ENODEV;
> > -               rte_atomic32_clear(&run_once);
> > +               __atomic_store_n(&run_once, 0, __ATOMIC_RELAXED);
> >                 return -1;
> >         }
> >
> > @@ -1138,7 +1140,7 @@ rte_eal_init(int argc, char **argv)
> >                 if (ret < 0) {
> >                         rte_eal_init_alert("Cannot get hugepage information.");
> >                         rte_errno = EACCES;
> > -                       rte_atomic32_clear(&run_once);
> > +                       __atomic_store_n(&run_once, 0, __ATOMIC_RELAXED);
> >                         return -1;
> >                 }
> >         }
> > @@ -1162,7 +1164,7 @@ rte_eal_init(int argc, char **argv)
> >         if (rte_eal_log_init(logid, internal_conf->syslog_facility) < 0) {
> >                 rte_eal_init_alert("Cannot init logging.");
> >                 rte_errno = ENOMEM;
> > -               rte_atomic32_clear(&run_once);
> > +               __atomic_store_n(&run_once, 0, __ATOMIC_RELAXED);
> >                 return -1;
> >         }
> >
> > @@ -1170,7 +1172,7 @@ rte_eal_init(int argc, char **argv)
> >         if (rte_eal_vfio_setup() < 0) {
> >                 rte_eal_init_alert("Cannot init VFIO");
> >                 rte_errno = EAGAIN;
> > -               rte_atomic32_clear(&run_once);
> > +               __atomic_store_n(&run_once, 0, __ATOMIC_RELAXED);
> >                 return -1;
> >         }
> >  #endif
> > --
> > 2.7.4
> >
> 
> I see no reason to include rte_atomic.h in those files after this patch.
> Did I miss something?

No, it is not needed anymore. 
Will remove them.


Thanks,
Phil

> 
> 
> --
> David Marchand


  reply	other threads:[~2020-09-24  3:44 UTC|newest]

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-09-11  3:29 [dpdk-dev] [PATCH 0/4] use C11 atomic builtins for libs Phil Yang
2020-09-11  3:29 ` [dpdk-dev] [PATCH 1/4] eal: use C11 atomic builtins for already initialized check Phil Yang
2020-09-11  3:29 ` [dpdk-dev] [PATCH 2/4] bbdev: use C11 atomic builtins for device processing counter Phil Yang
2020-09-11  3:29 ` [dpdk-dev] [PATCH 3/4] power: use C11 atomic builtins for power in use state update Phil Yang
2020-09-11  3:29 ` [dpdk-dev] [PATCH 4/4] ethdev: use C11 atomic builtins for link status update Phil Yang
2020-09-15 15:12 ` [dpdk-dev] [PATCH 0/4] use C11 atomic builtins for libs David Marchand
2020-09-16  7:32   ` Phil Yang
2020-09-16  8:23 ` [dpdk-dev] [PATCH v2 " Phil Yang
2020-09-16  8:23   ` [dpdk-dev] [PATCH v2 1/4] eal: use C11 atomic builtins for already initialized check Phil Yang
2020-09-23 13:06     ` David Marchand
2020-09-24  3:44       ` Phil Yang [this message]
2020-09-16  8:23   ` [dpdk-dev] [PATCH v2 2/4] bbdev: use C11 atomic builtins for device processing counter Phil Yang
2020-09-16  8:23   ` [dpdk-dev] [PATCH v2 3/4] power: use C11 atomic builtins for power in use state update Phil Yang
2020-09-16  8:23   ` [dpdk-dev] [PATCH v2 4/4] ethdev: use C11 atomic builtins for link status update Phil Yang
2020-09-17 16:08     ` Andrew Rybchenko
2020-09-23 13:18   ` [dpdk-dev] [PATCH v2 0/4] use C11 atomic builtins for libs David Marchand
2020-09-24  3:47     ` Phil Yang
2020-09-24  5:39   ` [dpdk-dev] [PATCH v3 " Phil Yang
2020-09-24  5:39     ` [dpdk-dev] [PATCH v3 1/4] eal: use C11 atomic builtins for already initialized check Phil Yang
2020-09-24  5:39     ` [dpdk-dev] [PATCH v3 2/4] bbdev: use C11 atomic builtins for device processing counter Phil Yang
2020-09-24 22:01       ` Chautru, Nicolas
2020-09-24 22:44         ` Honnappa Nagarahalli
2020-09-24 23:20           ` Chautru, Nicolas
2020-09-24  5:39     ` [dpdk-dev] [PATCH v3 3/4] power: use C11 atomic builtins for power in use state update Phil Yang
2020-09-24  8:34       ` David Hunt
2020-09-24  5:39     ` [dpdk-dev] [PATCH v3 4/4] ethdev: use C11 atomic builtins for link status update Phil Yang
2020-09-25 13:59     ` [dpdk-dev] [PATCH v3 0/4] use C11 atomic builtins for libs David Marchand

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