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GET /api/patches/96462/?format=api
{ "id": 96462, "url": "http://patchwork.dpdk.org/api/patches/96462/?format=api", "web_url": "http://patchwork.dpdk.org/project/dpdk/patch/20210730135533.417611-3-thomas@monjalon.net/", "project": { "id": 1, "url": "http://patchwork.dpdk.org/api/projects/1/?format=api", "name": "DPDK", "link_name": "dpdk", "list_id": "dev.dpdk.org", "list_email": "dev@dpdk.org", "web_url": "http://core.dpdk.org", "scm_url": "git://dpdk.org/dpdk", "webscm_url": "http://git.dpdk.org/dpdk", "list_archive_url": "https://inbox.dpdk.org/dev", "list_archive_url_format": "https://inbox.dpdk.org/dev/{}", "commit_url_format": "" }, "msgid": "<20210730135533.417611-3-thomas@monjalon.net>", "list_archive_url": "https://inbox.dpdk.org/dev/20210730135533.417611-3-thomas@monjalon.net", "date": "2021-07-30T13:55:28", "name": "[RFC,v2,2/7] hcdev: add event notification", "commit_ref": null, "pull_url": null, "state": "superseded", "archived": true, "hash": "9d1912567bf4ea27f8d875ab60d023ff2920e0a8", "submitter": { "id": 685, "url": "http://patchwork.dpdk.org/api/people/685/?format=api", "name": "Thomas Monjalon", "email": "thomas@monjalon.net" }, "delegate": { "id": 1, "url": "http://patchwork.dpdk.org/api/users/1/?format=api", "username": "tmonjalo", "first_name": "Thomas", "last_name": "Monjalon", "email": "thomas@monjalon.net" }, "mbox": "http://patchwork.dpdk.org/project/dpdk/patch/20210730135533.417611-3-thomas@monjalon.net/mbox/", "series": [ { "id": 18101, "url": "http://patchwork.dpdk.org/api/series/18101/?format=api", "web_url": "http://patchwork.dpdk.org/project/dpdk/list/?series=18101", "date": "2021-07-30T13:55:26", "name": "heterogeneous computing library", "version": 2, "mbox": "http://patchwork.dpdk.org/series/18101/mbox/" } ], "comments": "http://patchwork.dpdk.org/api/patches/96462/comments/", "check": "success", "checks": "http://patchwork.dpdk.org/api/patches/96462/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "<dev-bounces@dpdk.org>", "X-Original-To": "patchwork@inbox.dpdk.org", "Delivered-To": "patchwork@inbox.dpdk.org", "Received": [ "from mails.dpdk.org (mails.dpdk.org [217.70.189.124])\n\tby inbox.dpdk.org (Postfix) with ESMTP id 9862AA0A0C;\n\tFri, 30 Jul 2021 15:56:11 +0200 (CEST)", "from [217.70.189.124] (localhost [127.0.0.1])\n\tby mails.dpdk.org (Postfix) with ESMTP id 859D040DFB;\n\tFri, 30 Jul 2021 15:56:11 +0200 (CEST)", "from out1-smtp.messagingengine.com (out1-smtp.messagingengine.com\n [66.111.4.25]) by mails.dpdk.org (Postfix) with ESMTP id A35DF40141\n for <dev@dpdk.org>; Fri, 30 Jul 2021 15:56:09 +0200 (CEST)", "from compute1.internal (compute1.nyi.internal [10.202.2.41])\n by mailout.nyi.internal (Postfix) with ESMTP id 3F8CC5C00C9;\n Fri, 30 Jul 2021 09:56:09 -0400 (EDT)", "from mailfrontend1 ([10.202.2.162])\n by compute1.internal (MEProxy); Fri, 30 Jul 2021 09:56:09 -0400", "by mail.messagingengine.com (Postfix) with ESMTPA; Fri,\n 30 Jul 2021 09:56:06 -0400 (EDT)" ], "DKIM-Signature": [ "v=1; a=rsa-sha256; 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t0ea6rgNtlu0IaZvjklUdJr2G5066PlBRW5DrrJ7t/DjqSGRnU+E3FKKQM+6I4u0\n kindZRWgri00U113wQhOc/x7MEk4jgRXqYSG3EqPN/WJrZlHPjsLEPDJ885gyK1Q\n soIOBJuc0cS1JCX0QuIACJG0iOyzfNYxBl9BsEYMYWqrTfp75qOo3YpK1b1+JL2y\n khi53NZgUFTdYQ==" ], "X-ME-Sender": "<xms:9wQEYRnSq42y_rThlHhXTCjMzFUoVqfGjSbAgcr-x1evkHwYfnumNg>\n <xme:9wQEYc0G7VVPe-VgIzGetZ5JhSgss6CsLdcKvIgfgpaWOdBiiH3bilmoGPgJVzEL7\n _9RtkQnlQ93KyVUTQ>", "X-ME-Received": "\n <xmr:9wQEYXprZIw-LjVp-TAdFsrv_MxwPa__TEz4AZFEH3mdjQzD_bFKlz9nBaX5e6wHY4YpSgi6MJ7zXDRH3TUCkYcLqczfZWs>", "X-ME-Proxy-Cause": "\n gggruggvucftvghtrhhoucdtuddrgedvtddrheehgdeiiecutefuodetggdotefrodftvf\n curfhrohhfihhlvgemucfhrghsthforghilhdpqfgfvfdpuffrtefokffrpgfnqfghnecu\n uegrihhlohhuthemuceftddtnecusecvtfgvtghiphhivghnthhsucdlqddutddtmdenuc\n fjughrpefhvffufffkofgjfhgggfestdekredtredttdenucfhrhhomhepvfhhohhmrghs\n ucfoohhnjhgrlhhonhcuoehthhhomhgrshesmhhonhhjrghlohhnrdhnvghtqeenucggtf\n frrghtthgvrhhnpedvhefgiedvjeegtdevheefhfetleefgfeivefgffevfeejgedtgfeu\n tdehtdegveenucevlhhushhtvghrufhiiigvpedtnecurfgrrhgrmhepmhgrihhlfhhroh\n hmpehthhhomhgrshesmhhonhhjrghlohhnrdhnvght", "X-ME-Proxy": "<xmx:9wQEYRnLrCQcsAiH5f_z-0xALMdvnMuSv0-qs6CnYjWvWrQIt9uMNg>\n <xmx:9wQEYf2zWgErb6s7wVtF0H_Ugs8yLAqWusZmiCX9KJvjikqlvW9FKA>\n <xmx:9wQEYQuNduVotHB1I5p1halLc8ZhVF-SSXhYnEk-UFmbb1kMdZcsuQ>\n <xmx:-QQEYYImTRnQn-L1CXF-lQ5XN2QQOF07eewQJnllf5U5z_GnAjWGNg>", "From": "Thomas Monjalon <thomas@monjalon.net>", "To": "dev@dpdk.org", "Cc": "Stephen Hemminger <stephen@networkplumber.org>,\n David Marchand <david.marchand@redhat.com>,\n Andrew Rybchenko <andrew.rybchenko@oktetlabs.ru>,\n Haiyue Wang <haiyue.wang@intel.com>,\n Honnappa Nagarahalli <honnappa.nagarahalli@arm.com>,\n Jerin Jacob <jerinj@marvell.com>, Ferruh Yigit <ferruh.yigit@intel.com>,\n Elena Agostini <eagostini@nvidia.com>, Ray Kinsella <mdr@ashroe.eu>", "Date": "Fri, 30 Jul 2021 15:55:28 +0200", "Message-Id": "<20210730135533.417611-3-thomas@monjalon.net>", "X-Mailer": "git-send-email 2.31.1", "In-Reply-To": "<20210730135533.417611-1-thomas@monjalon.net>", "References": "<20210602203531.2288645-1-thomas@monjalon.net>\n <20210730135533.417611-1-thomas@monjalon.net>", "MIME-Version": "1.0", "Content-Transfer-Encoding": "8bit", "Subject": "[dpdk-dev] [RFC PATCH v2 2/7] hcdev: add event notification", "X-BeenThere": "dev@dpdk.org", "X-Mailman-Version": "2.1.29", "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>" }, "content": "Callback functions may be registered for a device event.\nCallback management is per-process and not thread-safe.\n\nThe events RTE_HCDEV_EVENT_NEW and RTE_HCDEV_EVENT_DEL\nare notified respectively after creation and before removal\nof a device, as part of the library functions.\nSome future events may be emitted from drivers.\n\nSigned-off-by: Thomas Monjalon <thomas@monjalon.net>\n---\n lib/hcdev/hcdev.c | 137 +++++++++++++++++++++++++++++++++++++++\n lib/hcdev/hcdev_driver.h | 7 ++\n lib/hcdev/rte_hcdev.h | 71 ++++++++++++++++++++\n lib/hcdev/version.map | 3 +\n 4 files changed, 218 insertions(+)", "diff": "diff --git a/lib/hcdev/hcdev.c b/lib/hcdev/hcdev.c\nindex ea587b3713..2a7ce1ccd8 100644\n--- a/lib/hcdev/hcdev.c\n+++ b/lib/hcdev/hcdev.c\n@@ -3,6 +3,7 @@\n */\n \n #include <rte_eal.h>\n+#include <rte_tailq.h>\n #include <rte_string_fns.h>\n #include <rte_errno.h>\n #include <rte_log.h>\n@@ -27,6 +28,15 @@ static int16_t hcdev_max;\n /* Number of currently valid devices */\n static int16_t hcdev_count;\n \n+/* Event callback object */\n+struct rte_hcdev_callback {\n+\tTAILQ_ENTRY(rte_hcdev_callback) next;\n+\trte_hcdev_callback_t *function;\n+\tvoid *user_data;\n+\tenum rte_hcdev_event event;\n+};\n+static void hcdev_free_callbacks(struct rte_hcdev *dev);\n+\n int\n rte_hcdev_init(size_t dev_max)\n {\n@@ -166,6 +176,7 @@ rte_hcdev_allocate(const char *name)\n \tdev->info.name = dev->name;\n \tdev->info.dev_id = dev_id;\n \tdev->info.numa_node = -1;\n+\tTAILQ_INIT(&dev->callbacks);\n \n \thcdev_count++;\n \tHCDEV_LOG(DEBUG, \"new device %s (id %d) of total %d\",\n@@ -180,6 +191,7 @@ rte_hcdev_complete_new(struct rte_hcdev *dev)\n \t\treturn;\n \n \tdev->state = RTE_HCDEV_STATE_INITIALIZED;\n+\trte_hcdev_notify(dev, RTE_HCDEV_EVENT_NEW);\n }\n \n int\n@@ -192,6 +204,9 @@ rte_hcdev_release(struct rte_hcdev *dev)\n \n \tHCDEV_LOG(DEBUG, \"free device %s (id %d)\",\n \t\t\tdev->info.name, dev->info.dev_id);\n+\trte_hcdev_notify(dev, RTE_HCDEV_EVENT_DEL);\n+\n+\thcdev_free_callbacks(dev);\n \tdev->state = RTE_HCDEV_STATE_UNUSED;\n \thcdev_count--;\n \n@@ -224,6 +239,128 @@ rte_hcdev_close(int16_t dev_id)\n \treturn firsterr;\n }\n \n+int\n+rte_hcdev_callback_register(int16_t dev_id, enum rte_hcdev_event event,\n+\t\trte_hcdev_callback_t *function, void *user_data)\n+{\n+\tint16_t next_dev, last_dev;\n+\tstruct rte_hcdev_callback_list *callbacks;\n+\tstruct rte_hcdev_callback *callback;\n+\n+\tif (!rte_hcdev_is_valid(dev_id) && dev_id != RTE_HCDEV_ID_ANY) {\n+\t\tHCDEV_LOG(ERR, \"register callback of invalid ID %d\", dev_id);\n+\t\trte_errno = ENODEV;\n+\t\treturn -rte_errno;\n+\t}\n+\tif (function == NULL) {\n+\t\tHCDEV_LOG(ERR, \"cannot register callback without function\");\n+\t\trte_errno = EINVAL;\n+\t\treturn -rte_errno;\n+\t}\n+\n+\tif (dev_id == RTE_HCDEV_ID_ANY) {\n+\t\tnext_dev = 0;\n+\t\tlast_dev = hcdev_max - 1;\n+\t} else {\n+\t\tnext_dev = last_dev = dev_id;\n+\t}\n+\tdo {\n+\t\tcallbacks = &hcdevs[next_dev].callbacks;\n+\n+\t\t/* check if not already registered */\n+\t\tTAILQ_FOREACH(callback, callbacks, next) {\n+\t\t\tif (callback->event == event &&\n+\t\t\t\t\tcallback->function == function &&\n+\t\t\t\t\tcallback->user_data == user_data) {\n+\t\t\t\tHCDEV_LOG(INFO, \"callback already registered\");\n+\t\t\t\treturn 0;\n+\t\t\t}\n+\t\t}\n+\n+\t\tcallback = malloc(sizeof(*callback));\n+\t\tif (callback == NULL) {\n+\t\t\tHCDEV_LOG(ERR, \"cannot allocate callback\");\n+\t\t\treturn -ENOMEM;\n+\t\t}\n+\t\tcallback->function = function;\n+\t\tcallback->user_data = user_data;\n+\t\tcallback->event = event;\n+\t\tTAILQ_INSERT_TAIL(callbacks, callback, next);\n+\n+\t} while (++next_dev <= last_dev);\n+\n+\treturn 0;\n+}\n+\n+int\n+rte_hcdev_callback_unregister(int16_t dev_id, enum rte_hcdev_event event,\n+\t\trte_hcdev_callback_t *function, void *user_data)\n+{\n+\tint16_t next_dev, last_dev;\n+\tstruct rte_hcdev_callback_list *callbacks;\n+\tstruct rte_hcdev_callback *callback, *next_callback;\n+\n+\tif (!rte_hcdev_is_valid(dev_id) && dev_id != RTE_HCDEV_ID_ANY) {\n+\t\tHCDEV_LOG(ERR, \"unregister callback of invalid ID %d\", dev_id);\n+\t\trte_errno = ENODEV;\n+\t\treturn -rte_errno;\n+\t}\n+\tif (function == NULL) {\n+\t\tHCDEV_LOG(ERR, \"cannot unregister callback without function\");\n+\t\trte_errno = EINVAL;\n+\t\treturn -rte_errno;\n+\t}\n+\n+\tif (dev_id == RTE_HCDEV_ID_ANY) {\n+\t\tnext_dev = 0;\n+\t\tlast_dev = hcdev_max - 1;\n+\t} else {\n+\t\tnext_dev = last_dev = dev_id;\n+\t}\n+\n+\tdo {\n+\t\tcallbacks = &hcdevs[next_dev].callbacks;\n+\t\tTAILQ_FOREACH_SAFE(callback, callbacks, next, next_callback) {\n+\t\t\tif (callback->event != event ||\n+\t\t\t\t\tcallback->function != function ||\n+\t\t\t\t\t(callback->user_data != user_data &&\n+\t\t\t\t\tuser_data != (void *)-1))\n+\t\t\t\tcontinue;\n+\t\t\tTAILQ_REMOVE(callbacks, callback, next);\n+\t\t\tfree(callback);\n+\t\t}\n+\t} while (++next_dev <= last_dev);\n+\n+\treturn 0;\n+}\n+\n+static void\n+hcdev_free_callbacks(struct rte_hcdev *dev)\n+{\n+\tstruct rte_hcdev_callback_list *callbacks;\n+\tstruct rte_hcdev_callback *callback, *next_callback;\n+\n+\tcallbacks = &dev->callbacks;\n+\tTAILQ_FOREACH_SAFE(callback, callbacks, next, next_callback) {\n+\t\tTAILQ_REMOVE(callbacks, callback, next);\n+\t\tfree(callback);\n+\t}\n+}\n+\n+void\n+rte_hcdev_notify(struct rte_hcdev *dev, enum rte_hcdev_event event)\n+{\n+\tint16_t dev_id;\n+\tstruct rte_hcdev_callback *callback;\n+\n+\tdev_id = dev->info.dev_id;\n+\tTAILQ_FOREACH(callback, &dev->callbacks, next) {\n+\t\tif (callback->event != event || callback->function == NULL)\n+\t\t\tcontinue;\n+\t\tcallback->function(dev_id, event, callback->user_data);\n+\t}\n+}\n+\n int\n rte_hcdev_info_get(int16_t dev_id, struct rte_hcdev_info *info)\n {\ndiff --git a/lib/hcdev/hcdev_driver.h b/lib/hcdev/hcdev_driver.h\nindex ca23cb9b9f..80d11bd612 100644\n--- a/lib/hcdev/hcdev_driver.h\n+++ b/lib/hcdev/hcdev_driver.h\n@@ -12,6 +12,7 @@\n #define RTE_HCDEV_DRIVER_H\n \n #include <stdint.h>\n+#include <sys/queue.h>\n \n #include <rte_dev.h>\n \n@@ -43,6 +44,8 @@ struct rte_hcdev {\n \tstruct rte_hcdev_info info;\n \t/* Driver functions. */\n \tstruct rte_hcdev_ops ops;\n+\t/* Event callback list. */\n+\tTAILQ_HEAD(rte_hcdev_callback_list, rte_hcdev_callback) callbacks;\n \t/* Current state (used or not) in the running process. */\n \tenum rte_hcdev_state state; /* Updated by this library. */\n \t/* Driver-specific private data for the running process. */\n@@ -64,4 +67,8 @@ void rte_hcdev_complete_new(struct rte_hcdev *dev);\n __rte_internal\n int rte_hcdev_release(struct rte_hcdev *dev);\n \n+/* Call registered callbacks. No multi-process event. */\n+__rte_internal\n+void rte_hcdev_notify(struct rte_hcdev *dev, enum rte_hcdev_event);\n+\n #endif /* RTE_HCDEV_DRIVER_H */\ndiff --git a/lib/hcdev/rte_hcdev.h b/lib/hcdev/rte_hcdev.h\nindex 83f58193c1..8131e4045a 100644\n--- a/lib/hcdev/rte_hcdev.h\n+++ b/lib/hcdev/rte_hcdev.h\n@@ -17,6 +17,7 @@\n *\n * The API is not thread-safe.\n * Device management must be done by a single thread.\n+ * TODO device rwlock for callback list\n *\n * @warning\n * @b EXPERIMENTAL: this API may change without prior notice.\n@@ -31,6 +32,11 @@ extern \"C\" {\n \n /** Empty device ID. */\n #define RTE_HCDEV_ID_NONE -1\n+/** Catch-all device ID. */\n+#define RTE_HCDEV_ID_ANY INT16_MIN\n+\n+/** Catch-all callback data. */\n+#define RTE_HCDEV_CALLBACK_ANY_DATA ((void *)-1)\n \n /** Store device info. */\n struct rte_hcdev_info {\n@@ -46,6 +52,18 @@ struct rte_hcdev_info {\n \tint16_t numa_node;\n };\n \n+/** Flags passed in notification callback. */\n+enum rte_hcdev_event {\n+\t/** Device is just initialized. */\n+\tRTE_HCDEV_EVENT_NEW,\n+\t/** Device is going to be released. */\n+\tRTE_HCDEV_EVENT_DEL,\n+};\n+\n+/** Prototype of event callback function. */\n+typedef void (rte_hcdev_callback_t)(int16_t dev_id,\n+\t\tenum rte_hcdev_event event, void *user_data);\n+\n /**\n * @warning\n * @b EXPERIMENTAL: this API may change without prior notice.\n@@ -142,6 +160,59 @@ int16_t rte_hcdev_find_next(int16_t dev_id);\n __rte_experimental\n int rte_hcdev_close(int16_t dev_id);\n \n+/**\n+ * @warning\n+ * @b EXPERIMENTAL: this API may change without prior notice.\n+ *\n+ * Register a function as event callback.\n+ * A function may be registered multiple times for different events.\n+ *\n+ * @param dev_id\n+ * Device ID to get notified about.\n+ * RTE_HCDEV_ID_ANY means all devices.\n+ * @param event\n+ * Device event to be registered for.\n+ * @param function\n+ * Callback function to be called on event.\n+ * @param user_data\n+ * Optional parameter passed in the callback.\n+ *\n+ * @return\n+ * 0 on success, -rte_errno otherwise:\n+ * - ENODEV if invalid dev_id\n+ * - EINVAL if NULL function\n+ * - ENOMEM if out of memory\n+ */\n+__rte_experimental\n+int rte_hcdev_callback_register(int16_t dev_id, enum rte_hcdev_event event,\n+\t\trte_hcdev_callback_t *function, void *user_data);\n+\n+/**\n+ * @warning\n+ * @b EXPERIMENTAL: this API may change without prior notice.\n+ *\n+ * Unregister for an event.\n+ *\n+ * @param dev_id\n+ * Device ID to be silenced.\n+ * RTE_HCDEV_ID_ANY means all devices.\n+ * @param event\n+ * Registered event.\n+ * @param function\n+ * Registered function.\n+ * @param user_data\n+ * Optional parameter as registered.\n+ * RTE_HCDEV_CALLBACK_ANY_DATA is a catch-all.\n+ *\n+ * @return\n+ * 0 on success, -rte_errno otherwise:\n+ * - ENODEV if invalid dev_id\n+ * - EINVAL if NULL function\n+ */\n+__rte_experimental\n+int rte_hcdev_callback_unregister(int16_t dev_id, enum rte_hcdev_event event,\n+\t\trte_hcdev_callback_t *function, void *user_data);\n+\n /**\n * @warning\n * @b EXPERIMENTAL: this API may change without prior notice.\ndiff --git a/lib/hcdev/version.map b/lib/hcdev/version.map\nindex bc6dae6de7..24a5a5a7c4 100644\n--- a/lib/hcdev/version.map\n+++ b/lib/hcdev/version.map\n@@ -2,6 +2,8 @@ EXPERIMENTAL {\n \tglobal:\n \n \t# added in 21.11\n+\trte_hcdev_callback_register;\n+\trte_hcdev_callback_unregister;\n \trte_hcdev_close;\n \trte_hcdev_count_avail;\n \trte_hcdev_find_next;\n@@ -16,5 +18,6 @@ INTERNAL {\n \trte_hcdev_allocate;\n \trte_hcdev_complete_new;\n \trte_hcdev_get_by_name;\n+\trte_hcdev_notify;\n \trte_hcdev_release;\n };\n", "prefixes": [ "RFC", "v2", "2/7" ] }