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[
    {
        "id": 115372,
        "web_url": "https://patches.dpdk.org/comment/115372/",
        "msgid": "<CALBAE1NnD_Ye3-fgPVjW-L_t8fEuhktJVf_-W3Sbj-tOiJAWOw@mail.gmail.com>",
        "date": "2020-07-07T14:29:30",
        "subject": "Re: [dpdk-dev] [PATCH v3 4/4] eventdev: relax smp barriers with C11\n\tatomics",
        "submitter": {
            "id": 1270,
            "url": "https://patches.dpdk.org/api/people/1270/?format=api",
            "name": "Jerin Jacob",
            "email": "jerinjacobk@gmail.com"
        },
        "content": "On Tue, Jul 7, 2020 at 4:45 PM Phil Yang <phil.yang@arm.com> wrote:\n>\n> The impl_opaque field is shared between the timer arm and cancel\n> operations. Meanwhile, the state flag acts as a guard variable to\n> make sure the update of impl_opaque is synchronized. The original\n> code uses rte_smp barriers to achieve that. This patch uses C11\n> atomics with an explicit one-way memory barrier instead of full\n> barriers rte_smp_w/rmb() to avoid the unnecessary barrier on aarch64.\n>\n> Since compilers can generate the same instructions for volatile and\n> non-volatile variable in C11 __atomics built-ins, so remain the volatile\n> keyword in front of state enum to avoid the ABI break issue.\n>\n> Signed-off-by: Phil Yang <phil.yang@arm.com>\n> Reviewed-by: Dharmik Thakkar <dharmik.thakkar@arm.com>\n> Reviewed-by: Ruifeng Wang <ruifeng.wang@arm.com>\n> Acked-by: Erik Gabriel Carrillo <erik.g.carrillo@intel.com>\n\n\nCould you fix the following:\n\nWARNING:TYPO_SPELLING: 'opague' may be misspelled - perhaps 'opaque'?\n#184: FILE: lib/librte_eventdev/rte_event_timer_adapter.c:1161:\n+ * specific opague data under the correct state.\n\ntotal: 0 errors, 1 warnings, 124 lines checked\n\n\n> ---\n> v3:\n> Fix ABI issue: revert to 'volatile enum rte_event_timer_state type state'.\n>\n> v2:\n> 1. Removed implementation-specific opaque data cleanup code.\n> 2. Replaced thread fence with atomic ACQURE/RELEASE ordering on state access.\n>\n>  lib/librte_eventdev/rte_event_timer_adapter.c | 55 ++++++++++++++++++---------\n>  1 file changed, 37 insertions(+), 18 deletions(-)\n>\n> diff --git a/lib/librte_eventdev/rte_event_timer_adapter.c b/lib/librte_eventdev/rte_event_timer_adapter.c\n> index d75415c..eb2c93a 100644\n> --- a/lib/librte_eventdev/rte_event_timer_adapter.c\n> +++ b/lib/librte_eventdev/rte_event_timer_adapter.c\n> @@ -629,7 +629,8 @@ swtim_callback(struct rte_timer *tim)\n>                 sw->expired_timers[sw->n_expired_timers++] = tim;\n>                 sw->stats.evtim_exp_count++;\n>\n> -               evtim->state = RTE_EVENT_TIMER_NOT_ARMED;\n> +               __atomic_store_n(&evtim->state, RTE_EVENT_TIMER_NOT_ARMED,\n> +                               __ATOMIC_RELEASE);\n>         }\n>\n>         if (event_buffer_batch_ready(&sw->buffer)) {\n> @@ -1020,6 +1021,7 @@ __swtim_arm_burst(const struct rte_event_timer_adapter *adapter,\n>         int n_lcores;\n>         /* Timer list for this lcore is not in use. */\n>         uint16_t exp_state = 0;\n> +       enum rte_event_timer_state n_state;\n>\n>  #ifdef RTE_LIBRTE_EVENTDEV_DEBUG\n>         /* Check that the service is running. */\n> @@ -1060,30 +1062,36 @@ __swtim_arm_burst(const struct rte_event_timer_adapter *adapter,\n>         }\n>\n>         for (i = 0; i < nb_evtims; i++) {\n> -               /* Don't modify the event timer state in these cases */\n> -               if (evtims[i]->state == RTE_EVENT_TIMER_ARMED) {\n> +               n_state = __atomic_load_n(&evtims[i]->state, __ATOMIC_ACQUIRE);\n> +               if (n_state == RTE_EVENT_TIMER_ARMED) {\n>                         rte_errno = EALREADY;\n>                         break;\n> -               } else if (!(evtims[i]->state == RTE_EVENT_TIMER_NOT_ARMED ||\n> -                            evtims[i]->state == RTE_EVENT_TIMER_CANCELED)) {\n> +               } else if (!(n_state == RTE_EVENT_TIMER_NOT_ARMED ||\n> +                            n_state == RTE_EVENT_TIMER_CANCELED)) {\n>                         rte_errno = EINVAL;\n>                         break;\n>                 }\n>\n>                 ret = check_timeout(evtims[i], adapter);\n>                 if (unlikely(ret == -1)) {\n> -                       evtims[i]->state = RTE_EVENT_TIMER_ERROR_TOOLATE;\n> +                       __atomic_store_n(&evtims[i]->state,\n> +                                       RTE_EVENT_TIMER_ERROR_TOOLATE,\n> +                                       __ATOMIC_RELAXED);\n>                         rte_errno = EINVAL;\n>                         break;\n>                 } else if (unlikely(ret == -2)) {\n> -                       evtims[i]->state = RTE_EVENT_TIMER_ERROR_TOOEARLY;\n> +                       __atomic_store_n(&evtims[i]->state,\n> +                                       RTE_EVENT_TIMER_ERROR_TOOEARLY,\n> +                                       __ATOMIC_RELAXED);\n>                         rte_errno = EINVAL;\n>                         break;\n>                 }\n>\n>                 if (unlikely(check_destination_event_queue(evtims[i],\n>                                                            adapter) < 0)) {\n> -                       evtims[i]->state = RTE_EVENT_TIMER_ERROR;\n> +                       __atomic_store_n(&evtims[i]->state,\n> +                                       RTE_EVENT_TIMER_ERROR,\n> +                                       __ATOMIC_RELAXED);\n>                         rte_errno = EINVAL;\n>                         break;\n>                 }\n> @@ -1099,13 +1107,18 @@ __swtim_arm_burst(const struct rte_event_timer_adapter *adapter,\n>                                           SINGLE, lcore_id, NULL, evtims[i]);\n>                 if (ret < 0) {\n>                         /* tim was in RUNNING or CONFIG state */\n> -                       evtims[i]->state = RTE_EVENT_TIMER_ERROR;\n> +                       __atomic_store_n(&evtims[i]->state,\n> +                                       RTE_EVENT_TIMER_ERROR,\n> +                                       __ATOMIC_RELEASE);\n>                         break;\n>                 }\n>\n> -               rte_smp_wmb();\n>                 EVTIM_LOG_DBG(\"armed an event timer\");\n> -               evtims[i]->state = RTE_EVENT_TIMER_ARMED;\n> +               /* RELEASE ordering guarantees the adapter specific value\n> +                * changes observed before the update of state.\n> +                */\n> +               __atomic_store_n(&evtims[i]->state, RTE_EVENT_TIMER_ARMED,\n> +                               __ATOMIC_RELEASE);\n>         }\n>\n>         if (i < nb_evtims)\n> @@ -1132,6 +1145,7 @@ swtim_cancel_burst(const struct rte_event_timer_adapter *adapter,\n>         struct rte_timer *timp;\n>         uint64_t opaque;\n>         struct swtim *sw = swtim_pmd_priv(adapter);\n> +       enum rte_event_timer_state n_state;\n>\n>  #ifdef RTE_LIBRTE_EVENTDEV_DEBUG\n>         /* Check that the service is running. */\n> @@ -1143,16 +1157,18 @@ swtim_cancel_burst(const struct rte_event_timer_adapter *adapter,\n>\n>         for (i = 0; i < nb_evtims; i++) {\n>                 /* Don't modify the event timer state in these cases */\n> -               if (evtims[i]->state == RTE_EVENT_TIMER_CANCELED) {\n> +               /* ACQUIRE ordering guarantees the access of implementation\n> +                * specific opague data under the correct state.\n> +                */\n> +               n_state = __atomic_load_n(&evtims[i]->state, __ATOMIC_ACQUIRE);\n> +               if (n_state == RTE_EVENT_TIMER_CANCELED) {\n>                         rte_errno = EALREADY;\n>                         break;\n> -               } else if (evtims[i]->state != RTE_EVENT_TIMER_ARMED) {\n> +               } else if (n_state != RTE_EVENT_TIMER_ARMED) {\n>                         rte_errno = EINVAL;\n>                         break;\n>                 }\n>\n> -               rte_smp_rmb();\n> -\n>                 opaque = evtims[i]->impl_opaque[0];\n>                 timp = (struct rte_timer *)(uintptr_t)opaque;\n>                 RTE_ASSERT(timp != NULL);\n> @@ -1166,9 +1182,12 @@ swtim_cancel_burst(const struct rte_event_timer_adapter *adapter,\n>\n>                 rte_mempool_put(sw->tim_pool, (void **)timp);\n>\n> -               evtims[i]->state = RTE_EVENT_TIMER_CANCELED;\n> -\n> -               rte_smp_wmb();\n> +               /* The RELEASE ordering here pairs with atomic ordering\n> +                * to make sure the state update data observed between\n> +                * threads.\n> +                */\n> +               __atomic_store_n(&evtims[i]->state, RTE_EVENT_TIMER_CANCELED,\n> +                               __ATOMIC_RELEASE);\n>         }\n>\n>         return i;\n> --\n> 2.7.4\n>",
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            "References": "<1593667604-12029-1-git-send-email-phil.yang@arm.com>\n <1594120403-17643-1-git-send-email-phil.yang@arm.com>\n <1594120403-17643-4-git-send-email-phil.yang@arm.com>",
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            "Date": "Tue, 7 Jul 2020 19:59:30 +0530",
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            ],
            "Subject": "Re: [dpdk-dev] [PATCH v3 4/4] eventdev: relax smp barriers with C11\n\tatomics",
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            "From": "Jerin Jacob <jerinjacobk@gmail.com>",
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            "Cc": "Thomas Monjalon <thomas@monjalon.net>,\n Erik Gabriel Carrillo <erik.g.carrillo@intel.com>,\n dpdk-dev <dev@dpdk.org>, Jerin Jacob <jerinj@marvell.com>,\n Honnappa Nagarahalli <Honnappa.Nagarahalli@arm.com>,\n David Christensen <drc@linux.vnet.ibm.com>,\n \"Ruifeng Wang (Arm Technology China)\" <Ruifeng.Wang@arm.com>,\n Dharmik Thakkar <Dharmik.Thakkar@arm.com>, nd <nd@arm.com>,\n David Marchand <david.marchand@redhat.com>, Ray Kinsella <mdr@ashroe.eu>,\n Neil Horman <nhorman@tuxdriver.com>, dodji@redhat.com",
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            "To": "Phil Yang <phil.yang@arm.com>"
        }
    },
    {
        "id": 115384,
        "web_url": "https://patches.dpdk.org/comment/115384/",
        "msgid": "<VE1PR08MB464017605A7E64CD8BF59EC1E9660@VE1PR08MB4640.eurprd08.prod.outlook.com>",
        "date": "2020-07-07T15:56:53",
        "subject": "Re: [dpdk-dev] [PATCH v3 4/4] eventdev: relax smp barriers with C11\n atomics",
        "submitter": {
            "id": 833,
            "url": "https://patches.dpdk.org/api/people/833/?format=api",
            "name": "Phil Yang",
            "email": "phil.yang@arm.com"
        },
        "content": "> -----Original Message-----\n> From: Jerin Jacob <jerinjacobk@gmail.com>\n> Sent: Tuesday, July 7, 2020 10:30 PM\n> To: Phil Yang <Phil.Yang@arm.com>\n> Cc: thomas@monjalon.net; Erik Gabriel Carrillo <erik.g.carrillo@intel.com>;\n> dpdk-dev <dev@dpdk.org>; jerinj@marvell.com; Honnappa Nagarahalli\n> <Honnappa.Nagarahalli@arm.com>; David Christensen\n> <drc@linux.vnet.ibm.com>; Ruifeng Wang <Ruifeng.Wang@arm.com>;\n> Dharmik Thakkar <Dharmik.Thakkar@arm.com>; nd <nd@arm.com>; David\n> Marchand <david.marchand@redhat.com>; Ray Kinsella <mdr@ashroe.eu>;\n> Neil Horman <nhorman@tuxdriver.com>; dodji@redhat.com\n> Subject: Re: [dpdk-dev] [PATCH v3 4/4] eventdev: relax smp barriers with\n> C11 atomics\n> \n> On Tue, Jul 7, 2020 at 4:45 PM Phil Yang <phil.yang@arm.com> wrote:\n> >\n> > The impl_opaque field is shared between the timer arm and cancel\n> > operations. Meanwhile, the state flag acts as a guard variable to\n> > make sure the update of impl_opaque is synchronized. The original\n> > code uses rte_smp barriers to achieve that. This patch uses C11\n> > atomics with an explicit one-way memory barrier instead of full\n> > barriers rte_smp_w/rmb() to avoid the unnecessary barrier on aarch64.\n> >\n> > Since compilers can generate the same instructions for volatile and\n> > non-volatile variable in C11 __atomics built-ins, so remain the volatile\n> > keyword in front of state enum to avoid the ABI break issue.\n> >\n> > Signed-off-by: Phil Yang <phil.yang@arm.com>\n> > Reviewed-by: Dharmik Thakkar <dharmik.thakkar@arm.com>\n> > Reviewed-by: Ruifeng Wang <ruifeng.wang@arm.com>\n> > Acked-by: Erik Gabriel Carrillo <erik.g.carrillo@intel.com>\n> \n> \n> Could you fix the following:\n> \n> WARNING:TYPO_SPELLING: 'opague' may be misspelled - perhaps 'opaque'?\n> #184: FILE: lib/librte_eventdev/rte_event_timer_adapter.c:1161:\n> + * specific opague data under the correct state.\nDone. \n\nThanks,\nPhil",
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            "References": "<1593667604-12029-1-git-send-email-phil.yang@arm.com>\n <1594120403-17643-1-git-send-email-phil.yang@arm.com>\n <1594120403-17643-4-git-send-email-phil.yang@arm.com>\n <CALBAE1NnD_Ye3-fgPVjW-L_t8fEuhktJVf_-W3Sbj-tOiJAWOw@mail.gmail.com>",
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            "CC": "\"thomas@monjalon.net\" <thomas@monjalon.net>, Erik Gabriel Carrillo\n <erik.g.carrillo@intel.com>, dpdk-dev <dev@dpdk.org>, \"jerinj@marvell.com\"\n <jerinj@marvell.com>, Honnappa Nagarahalli <Honnappa.Nagarahalli@arm.com>,\n David Christensen <drc@linux.vnet.ibm.com>, Ruifeng Wang\n <Ruifeng.Wang@arm.com>, Dharmik Thakkar <Dharmik.Thakkar@arm.com>, nd\n <nd@arm.com>, David Marchand <david.marchand@redhat.com>, Ray Kinsella\n <mdr@ashroe.eu>, Neil Horman <nhorman@tuxdriver.com>, \"dodji@redhat.com\"\n <dodji@redhat.com>",
            "Thread-Topic": "[dpdk-dev] [PATCH v3 4/4] eventdev: relax smp barriers with C11\n atomics",
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            "Subject": "Re: [dpdk-dev] [PATCH v3 4/4] eventdev: relax smp barriers with C11\n atomics",
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