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[ { "id": 115597, "web_url": "https://patches.dpdk.org/comment/115597/", "msgid": "<CACKs7VBFoe1TrpZiFh8wKyaGNWRmB3H3k_+fCbMR6_1Eox62HQ@mail.gmail.com>", "list_archive_url": "https://inbox.dpdk.org/dev/CACKs7VBFoe1TrpZiFh8wKyaGNWRmB3H3k_+fCbMR6_1Eox62HQ@mail.gmail.com", "date": "2020-07-09T08:02:25", "subject": "Re: [dpdk-dev] [PATCH v2] eal: use c11 atomic built-ins for\n\tinterrupt status", "submitter": { "id": 172, "url": "https://patches.dpdk.org/api/people/172/?format=api", "name": "Stefan Puiu", "email": "stefan.puiu@gmail.com" }, "content": "Hi,\n\nNoticed 2 typos:\n\nOn Thu, Jul 9, 2020 at 9:46 AM Phil Yang <phil.yang@arm.com> wrote:\n>\n> The event status is defined as a volatile variable and shared between\n> threads. Use c11 atomic built-ins with explicit ordering instead of\n> rte_atomic ops which enforce unnecessary barriers on aarch64.\n>\n> The event status has been cleaned up by the compare-and-swap operation\n> when we free the event data, so there is no need to set it to invalid\n> after that.\n>\n> Signed-off-by: Phil Yang <phil.yang@arm.com>\n> Reviewed-by: Ruifeng Wang <ruifeng.wang@arm.com>\n> Reviewed-by: Honnappa Nagarahalli <honnappa.nagarahalli@arm.com>\n> Reviewed-by: Harman Kalra <hkalra@marvell.com>\n> ---\n> v2:\n> 1. Fixed typo.\n> 2. Updated libabigail.abignore to pass ABI check.\n> 3. Merged v1 two patches into one patch.\n>\n> devtools/libabigail.abignore | 4 +++\n> lib/librte_eal/include/rte_eal_interrupts.h | 2 +-\n> lib/librte_eal/linux/eal_interrupts.c | 48 ++++++++++++++++++++---------\n> 3 files changed, 38 insertions(+), 16 deletions(-)\n>\n> diff --git a/devtools/libabigail.abignore b/devtools/libabigail.abignore\n> index 0133f75..daa4631 100644\n> --- a/devtools/libabigail.abignore\n> +++ b/devtools/libabigail.abignore\n> @@ -48,6 +48,10 @@\n> changed_enumerators = RTE_CRYPTO_AEAD_LIST_END\n> [suppress_variable]\n> name = rte_crypto_aead_algorithm_strings\n> +; Ignore updates of epoll event\n> +[suppress_type]\n> + type_kind = struct\n> + name = rte_epoll_event\n>\n> ;;;;;;;;;;;;;;;;;;;;;;\n> ; Temporary exceptions till DPDK 20.11\n> diff --git a/lib/librte_eal/include/rte_eal_interrupts.h b/lib/librte_eal/include/rte_eal_interrupts.h\n> index 773a34a..b1e8a29 100644\n> --- a/lib/librte_eal/include/rte_eal_interrupts.h\n> +++ b/lib/librte_eal/include/rte_eal_interrupts.h\n> @@ -59,7 +59,7 @@ enum {\n>\n> /** interrupt epoll event obj, taken by epoll_event.ptr */\n> struct rte_epoll_event {\n> - volatile uint32_t status; /**< OUT: event status */\n> + uint32_t status; /**< OUT: event status */\n> int fd; /**< OUT: event fd */\n> int epfd; /**< OUT: epoll instance the ev associated with */\n> struct rte_epoll_data epdata;\n> diff --git a/lib/librte_eal/linux/eal_interrupts.c b/lib/librte_eal/linux/eal_interrupts.c\n> index 84eeaa1..7a50869 100644\n> --- a/lib/librte_eal/linux/eal_interrupts.c\n> +++ b/lib/librte_eal/linux/eal_interrupts.c\n> @@ -26,7 +26,6 @@\n> #include <rte_eal.h>\n> #include <rte_per_lcore.h>\n> #include <rte_lcore.h>\n> -#include <rte_atomic.h>\n> #include <rte_branch_prediction.h>\n> #include <rte_debug.h>\n> #include <rte_log.h>\n> @@ -1221,11 +1220,18 @@ eal_epoll_process_event(struct epoll_event *evs, unsigned int n,\n> {\n> unsigned int i, count = 0;\n> struct rte_epoll_event *rev;\n> + uint32_t valid_status;\n>\n> for (i = 0; i < n; i++) {\n> rev = evs[i].data.ptr;\n> - if (!rev || !rte_atomic32_cmpset(&rev->status, RTE_EPOLL_VALID,\n> - RTE_EPOLL_EXEC))\n> + valid_status = RTE_EPOLL_VALID;\n> + /* ACQUIRE memory ordering here pairs with RELEASE\n> + * ordering bellow acting as a lock to synchronize\ns/bellow/below\n\n> + * the event data updating.\n> + */\n> + if (!rev || !__atomic_compare_exchange_n(&rev->status,\n> + &valid_status, RTE_EPOLL_EXEC, 0,\n> + __ATOMIC_ACQUIRE, __ATOMIC_RELAXED))\n> continue;\n>\n> events[count].status = RTE_EPOLL_VALID;\n> @@ -1237,8 +1243,11 @@ eal_epoll_process_event(struct epoll_event *evs, unsigned int n,\n> rev->epdata.cb_fun(rev->fd,\n> rev->epdata.cb_arg);\n>\n> - rte_compiler_barrier();\n> - rev->status = RTE_EPOLL_VALID;\n> + /* the status update should be observed after\n> + * the other fields changes.\ns/fields changes/fields change/\n\nThanks,\nStefan.\n\n> + */\n> + __atomic_store_n(&rev->status, RTE_EPOLL_VALID,\n> + __ATOMIC_RELEASE);\n> count++;\n> }\n> return count;\n> @@ -1308,10 +1317,14 @@ rte_epoll_wait(int epfd, struct rte_epoll_event *events,\n> static inline void\n> eal_epoll_data_safe_free(struct rte_epoll_event *ev)\n> {\n> - while (!rte_atomic32_cmpset(&ev->status, RTE_EPOLL_VALID,\n> - RTE_EPOLL_INVALID))\n> - while (ev->status != RTE_EPOLL_VALID)\n> + uint32_t valid_status = RTE_EPOLL_VALID;\n> + while (!__atomic_compare_exchange_n(&ev->status, &valid_status,\n> + RTE_EPOLL_INVALID, 0, __ATOMIC_ACQUIRE, __ATOMIC_RELAXED)) {\n> + while (__atomic_load_n(&ev->status,\n> + __ATOMIC_RELAXED) != RTE_EPOLL_VALID)\n> rte_pause();\n> + valid_status = RTE_EPOLL_VALID;\n> + }\n> memset(&ev->epdata, 0, sizeof(ev->epdata));\n> ev->fd = -1;\n> ev->epfd = -1;\n> @@ -1333,7 +1346,8 @@ rte_epoll_ctl(int epfd, int op, int fd,\n> epfd = rte_intr_tls_epfd();\n>\n> if (op == EPOLL_CTL_ADD) {\n> - event->status = RTE_EPOLL_VALID;\n> + __atomic_store_n(&event->status, RTE_EPOLL_VALID,\n> + __ATOMIC_RELAXED);\n> event->fd = fd; /* ignore fd in event */\n> event->epfd = epfd;\n> ev.data.ptr = (void *)event;\n> @@ -1345,11 +1359,13 @@ rte_epoll_ctl(int epfd, int op, int fd,\n> op, fd, strerror(errno));\n> if (op == EPOLL_CTL_ADD)\n> /* rollback status when CTL_ADD fail */\n> - event->status = RTE_EPOLL_INVALID;\n> + __atomic_store_n(&event->status, RTE_EPOLL_INVALID,\n> + __ATOMIC_RELAXED);\n> return -1;\n> }\n>\n> - if (op == EPOLL_CTL_DEL && event->status != RTE_EPOLL_INVALID)\n> + if (op == EPOLL_CTL_DEL && __atomic_load_n(&event->status,\n> + __ATOMIC_RELAXED) != RTE_EPOLL_INVALID)\n> eal_epoll_data_safe_free(event);\n>\n> return 0;\n> @@ -1378,7 +1394,8 @@ rte_intr_rx_ctl(struct rte_intr_handle *intr_handle, int epfd,\n> case RTE_INTR_EVENT_ADD:\n> epfd_op = EPOLL_CTL_ADD;\n> rev = &intr_handle->elist[efd_idx];\n> - if (rev->status != RTE_EPOLL_INVALID) {\n> + if (__atomic_load_n(&rev->status,\n> + __ATOMIC_RELAXED) != RTE_EPOLL_INVALID) {\n> RTE_LOG(INFO, EAL, \"Event already been added.\\n\");\n> return -EEXIST;\n> }\n> @@ -1401,7 +1418,8 @@ rte_intr_rx_ctl(struct rte_intr_handle *intr_handle, int epfd,\n> case RTE_INTR_EVENT_DEL:\n> epfd_op = EPOLL_CTL_DEL;\n> rev = &intr_handle->elist[efd_idx];\n> - if (rev->status == RTE_EPOLL_INVALID) {\n> + if (__atomic_load_n(&rev->status,\n> + __ATOMIC_RELAXED) == RTE_EPOLL_INVALID) {\n> RTE_LOG(INFO, EAL, \"Event does not exist.\\n\");\n> return -EPERM;\n> }\n> @@ -1426,12 +1444,12 @@ rte_intr_free_epoll_fd(struct rte_intr_handle *intr_handle)\n>\n> for (i = 0; i < intr_handle->nb_efd; i++) {\n> rev = &intr_handle->elist[i];\n> - if (rev->status == RTE_EPOLL_INVALID)\n> + if (__atomic_load_n(&rev->status,\n> + __ATOMIC_RELAXED) == RTE_EPOLL_INVALID)\n> continue;\n> if (rte_epoll_ctl(rev->epfd, EPOLL_CTL_DEL, rev->fd, rev)) {\n> /* force free if the entry valid */\n> eal_epoll_data_safe_free(rev);\n> - rev->status = RTE_EPOLL_INVALID;\n> }\n> }\n> }\n> --\n> 2.7.4\n>", "headers": { "Return-Path": "<dev-bounces@dpdk.org>", "X-Original-To": "patchwork@inbox.dpdk.org", "Delivered-To": "patchwork@inbox.dpdk.org", "Received": [ "from dpdk.org (dpdk.org [92.243.14.124])\n\tby inbox.dpdk.org (Postfix) with ESMTP id 5AB14A0526;\n\tThu, 9 Jul 2020 10:02:39 +0200 (CEST)", "from [92.243.14.124] (localhost [127.0.0.1])\n\tby dpdk.org (Postfix) with ESMTP id 0CAE61DCDF;\n\tThu, 9 Jul 2020 10:02:39 +0200 (CEST)", "from mail-pl1-f195.google.com (mail-pl1-f195.google.com\n [209.85.214.195]) by dpdk.org (Postfix) with ESMTP id 1D2A81DCDA\n for <dev@dpdk.org>; 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charset=\"UTF-8\"", "Subject": "Re: [dpdk-dev] [PATCH v2] eal: use c11 atomic built-ins for\n\tinterrupt status", "X-BeenThere": "dev@dpdk.org", "X-Mailman-Version": "2.1.15", "Precedence": "list", "List-Id": "DPDK patches and discussions <dev.dpdk.org>", "List-Unsubscribe": "<https://mails.dpdk.org/options/dev>,\n <mailto:dev-request@dpdk.org?subject=unsubscribe>", "List-Archive": "<http://mails.dpdk.org/archives/dev/>", "List-Post": "<mailto:dev@dpdk.org>", "List-Help": "<mailto:dev-request@dpdk.org?subject=help>", "List-Subscribe": "<https://mails.dpdk.org/listinfo/dev>,\n <mailto:dev-request@dpdk.org?subject=subscribe>", "Errors-To": "dev-bounces@dpdk.org", "Sender": "\"dev\" <dev-bounces@dpdk.org>" }, "addressed": null }, { "id": 115598, "web_url": "https://patches.dpdk.org/comment/115598/", "msgid": "<VE1PR08MB46407F5B6B35446065D280B3E9640@VE1PR08MB4640.eurprd08.prod.outlook.com>", "list_archive_url": "https://inbox.dpdk.org/dev/VE1PR08MB46407F5B6B35446065D280B3E9640@VE1PR08MB4640.eurprd08.prod.outlook.com", "date": "2020-07-09T08:07:42", "subject": "Re: [dpdk-dev] [PATCH v2] eal: use c11 atomic built-ins for\n interrupt status", "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: Stefan Puiu <stefan.puiu@gmail.com>\n> Sent: Thursday, July 9, 2020 4:02 PM\n> To: Phil Yang <Phil.Yang@arm.com>\n> Cc: david.marchand@redhat.com; dev@dpdk.org; mdr@ashroe.eu;\n> aconole@redhat.com; drc@linux.vnet.ibm.com; Honnappa Nagarahalli\n> <Honnappa.Nagarahalli@arm.com>; Ruifeng Wang\n> <Ruifeng.Wang@arm.com>; nd <nd@arm.com>; dodji@redhat.com; Neil\n> Horman <nhorman@tuxdriver.com>; hkalra@marvell.com\n> Subject: Re: [dpdk-dev] [PATCH v2] eal: use c11 atomic built-ins for interrupt\n> status\n> \n> Hi,\n> \n> Noticed 2 typos:\nHi Stefan,\n\nThanks for your feedback.\nWill do.\n\nThanks,\nPhil\n\n<snip>", "headers": { "Return-Path": "<dev-bounces@dpdk.org>", "X-Original-To": "patchwork@inbox.dpdk.org", "Delivered-To": "patchwork@inbox.dpdk.org", "Received": [ "from dpdk.org (dpdk.org [92.243.14.124])\n\tby inbox.dpdk.org (Postfix) with ESMTP id 52346A0526;\n\tThu, 9 Jul 2020 10:07:54 +0200 (CEST)", "from [92.243.14.124] (localhost [127.0.0.1])\n\tby dpdk.org (Postfix) with ESMTP id A4DAC1B75C;\n\tThu, 9 Jul 2020 10:07:53 +0200 (CEST)", "from EUR03-DB5-obe.outbound.protection.outlook.com\n (mail-eopbgr40080.outbound.protection.outlook.com [40.107.4.80])\n by dpdk.org (Postfix) with ESMTP id B5F981DBB\n for <dev@dpdk.org>; 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