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{
    "id": 44231,
    "url": "http://patches.dpdk.org/api/patches/44231/",
    "web_url": "http://patches.dpdk.org/patch/44231/",
    "project": {
        "id": 1,
        "url": "http://patches.dpdk.org/api/projects/1/",
        "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"
    },
    "msgid": "<db0ef3ab6e8d2306ea58512f18d5744128b791b6.1536064999.git.anatoly.burakov@intel.com>",
    "date": "2018-09-04T13:11:49",
    "name": "[14/16] malloc: allow attaching to external memory chunks",
    "commit_ref": null,
    "pull_url": null,
    "state": "superseded",
    "archived": true,
    "hash": "7c489e543165bf05e2b4514dc34db4c0731f72fb",
    "submitter": {
        "id": 4,
        "url": "http://patches.dpdk.org/api/people/4/",
        "name": "Burakov, Anatoly",
        "email": "anatoly.burakov@intel.com"
    },
    "delegate": {
        "id": 1,
        "url": "http://patches.dpdk.org/api/users/1/",
        "username": "tmonjalo",
        "first_name": "Thomas",
        "last_name": "Monjalon",
        "email": "thomas@monjalon.net"
    },
    "mbox": "http://patches.dpdk.org/patch/44231/mbox/",
    "series": [
        {
            "id": 1170,
            "url": "http://patches.dpdk.org/api/series/1170/",
            "web_url": "http://patches.dpdk.org/project/dpdk/list/?series=1170",
            "date": "2018-09-04T13:11:35",
            "name": "Support externally allocated memory in DPDK",
            "version": 1,
            "mbox": "http://patches.dpdk.org/series/1170/mbox/"
        }
    ],
    "comments": "http://patches.dpdk.org/api/patches/44231/comments/",
    "check": "success",
    "checks": "http://patches.dpdk.org/api/patches/44231/checks/",
    "tags": {},
    "headers": {
        "X-Mailman-Version": "2.1.15",
        "X-ExtLoop1": "1",
        "Errors-To": "dev-bounces@dpdk.org",
        "X-Amp-Result": "SKIPPED(no attachment in message)",
        "X-Mailer": "git-send-email 1.7.0.7",
        "Received": [
            "from [92.243.14.124] (localhost [127.0.0.1])\n\tby dpdk.org (Postfix) with ESMTP id 151045B20;\n\tTue,  4 Sep 2018 15:12:13 +0200 (CEST)",
            "from mga04.intel.com (mga04.intel.com [192.55.52.120])\n\tby dpdk.org (Postfix) with ESMTP id D8C934F9B\n\tfor <dev@dpdk.org>; Tue,  4 Sep 2018 15:12:06 +0200 (CEST)",
            "from fmsmga001.fm.intel.com ([10.253.24.23])\n\tby fmsmga104.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384;\n\t04 Sep 2018 06:11:57 -0700",
            "from irvmail001.ir.intel.com ([163.33.26.43])\n\tby fmsmga001.fm.intel.com with ESMTP; 04 Sep 2018 06:11:55 -0700",
            "from sivswdev01.ir.intel.com (sivswdev01.ir.intel.com\n\t[10.237.217.45])\n\tby irvmail001.ir.intel.com (8.14.3/8.13.6/MailSET/Hub) with ESMTP id\n\tw84DBseZ023387; Tue, 4 Sep 2018 14:11:54 +0100",
            "from sivswdev01.ir.intel.com (localhost [127.0.0.1])\n\tby sivswdev01.ir.intel.com with ESMTP id w84DBsGp024838;\n\tTue, 4 Sep 2018 14:11:54 +0100",
            "(from aburakov@localhost)\n\tby sivswdev01.ir.intel.com with LOCAL id w84DBsow024827;\n\tTue, 4 Sep 2018 14:11:54 +0100"
        ],
        "References": [
            "<cover.1536064999.git.anatoly.burakov@intel.com>",
            "<cover.1536064999.git.anatoly.burakov@intel.com>"
        ],
        "X-Amp-File-Uploaded": "False",
        "X-BeenThere": "dev@dpdk.org",
        "Message-Id": "<db0ef3ab6e8d2306ea58512f18d5744128b791b6.1536064999.git.anatoly.burakov@intel.com>",
        "X-IronPort-AV": "E=Sophos;i=\"5.53,329,1531810800\"; d=\"scan'208\";a=\"87028575\"",
        "List-Id": "DPDK patches and discussions <dev.dpdk.org>",
        "Precedence": "list",
        "From": "Anatoly Burakov <anatoly.burakov@intel.com>",
        "X-Original-To": "patchwork@dpdk.org",
        "List-Post": "<mailto:dev@dpdk.org>",
        "Return-Path": "<dev-bounces@dpdk.org>",
        "Sender": "\"dev\" <dev-bounces@dpdk.org>",
        "List-Help": "<mailto:dev-request@dpdk.org?subject=help>",
        "In-Reply-To": [
            "<cover.1536064999.git.anatoly.burakov@intel.com>",
            "<cover.1536064999.git.anatoly.burakov@intel.com>"
        ],
        "List-Subscribe": "<https://mails.dpdk.org/listinfo/dev>,\n\t<mailto:dev-request@dpdk.org?subject=subscribe>",
        "To": "dev@dpdk.org",
        "Delivered-To": "patchwork@dpdk.org",
        "List-Unsubscribe": "<https://mails.dpdk.org/options/dev>,\n\t<mailto:dev-request@dpdk.org?subject=unsubscribe>",
        "Date": "Tue,  4 Sep 2018 14:11:49 +0100",
        "Cc": "laszlo.madarassy@ericsson.com, laszlo.vadkerti@ericsson.com,\n\tandras.kovacs@ericsson.com, winnie.tian@ericsson.com,\n\tdaniel.andrasi@ericsson.com, janos.kobor@ericsson.com,\n\tsrinath.mannam@broadcom.com, scott.branden@broadcom.com,\n\tajit.khaparde@broadcom.com, keith.wiles@intel.com,\n\tbruce.richardson@intel.com, thomas@monjalon.net",
        "List-Archive": "<http://mails.dpdk.org/archives/dev/>",
        "Subject": "[dpdk-dev] [PATCH 14/16] malloc: allow attaching to external memory\n\tchunks"
    },
    "content": "In order to use external memory in multiple processes, we need to\nattach to primary process's memseg lists, so add a new API to do\nthat. It is the responsibility of the user to ensure that memory\nis accessible and that it has been previously added to the malloc\nheap by another process.\n\nSigned-off-by: Anatoly Burakov <anatoly.burakov@intel.com>\n---\n lib/librte_eal/common/include/rte_malloc.h | 32 +++++++++\n lib/librte_eal/common/rte_malloc.c         | 83 ++++++++++++++++++++++\n lib/librte_eal/rte_eal_version.map         |  1 +\n 3 files changed, 116 insertions(+)",
    "diff": "diff --git a/lib/librte_eal/common/include/rte_malloc.h b/lib/librte_eal/common/include/rte_malloc.h\nindex 9bbe8e3af..37af0e481 100644\n--- a/lib/librte_eal/common/include/rte_malloc.h\n+++ b/lib/librte_eal/common/include/rte_malloc.h\n@@ -268,6 +268,10 @@ rte_malloc_get_socket_stats(int socket,\n  *\n  * @note Multiple memory chunks can be added to the same heap\n  *\n+ * @note Before accessing this memory in other processes, it needs to be\n+ *   attached in each of those processes by calling\n+ *   ``rte_malloc_heap_memory_attach`` in each other process.\n+ *\n  * @note Memory must be previously allocated for DPDK to be able to use it as a\n  *   malloc heap. Failing to do so will result in undefined behavior, up to and\n  *   including segmentation faults.\n@@ -329,12 +333,38 @@ rte_malloc_heap_memory_add(const char *heap_name, void *va_addr, size_t len,\n int __rte_experimental\n rte_malloc_heap_memory_remove(const char *heap_name, void *va_addr, size_t len);\n \n+/**\n+ * Attach to an already existing chunk of external memory in another process.\n+ *\n+ * @note This function must be called before any attempt is made to use an\n+ *   already existing external memory chunk. This function does *not* need to\n+ *   be called if a call to ``rte_malloc_heap_memory_add`` was made in the\n+ *   current process.\n+ *\n+ * @param heap_name\n+ *   Heap name to which this chunk of memory belongs\n+ * @param va_addr\n+ *   Start address of memory chunk to attach to\n+ * @param len\n+ *   Length of memory chunk to attach to\n+ * @return\n+ *   0 on successful attach\n+ *   -1 on unsuccessful attach, with rte_errno set to indicate cause for error:\n+ *     EINVAL - one of the parameters was invalid\n+ *     EPERM  - attempted to attach memory to a reserved heap\n+ *     ENOENT - heap or memory chunk was not found\n+ */\n+int __rte_experimental\n+rte_malloc_heap_memory_attach(const char *heap_name, void *va_addr, size_t len);\n+\n /**\n  * Creates a new empty malloc heap with a specified name.\n  *\n  * @note Heaps created via this call will automatically get assigned a unique\n  *   socket ID, which can be found using ``rte_malloc_heap_get_socket()``\n  *\n+ * @note This function has to only be called in one process.\n+ *\n  * @param heap_name\n  *   Name of the heap to create.\n  *\n@@ -357,6 +387,8 @@ rte_malloc_heap_create(const char *heap_name);\n  * @note This function will return a failure result if not all memory segments\n  *   were removed from the heap prior to its destruction\n  *\n+ * @note This function has to only be called in one process.\n+ *\n  * @param heap_name\n  *   Name of the heap to create.\n  *\ndiff --git a/lib/librte_eal/common/rte_malloc.c b/lib/librte_eal/common/rte_malloc.c\nindex 5093c4a46..2ed173466 100644\n--- a/lib/librte_eal/common/rte_malloc.c\n+++ b/lib/librte_eal/common/rte_malloc.c\n@@ -393,6 +393,89 @@ rte_malloc_heap_memory_remove(const char *heap_name, void *va_addr, size_t len)\n \treturn ret;\n }\n \n+struct sync_mem_walk_arg {\n+\tvoid *va_addr;\n+\tsize_t len;\n+\tint result;\n+};\n+\n+static int\n+attach_mem_walk(const struct rte_memseg_list *msl, void *arg)\n+{\n+\tstruct rte_mem_config *mcfg = rte_eal_get_configuration()->mem_config;\n+\tstruct sync_mem_walk_arg *wa = arg;\n+\tsize_t len = msl->page_sz * msl->memseg_arr.len;\n+\n+\tif (msl->base_va == wa->va_addr &&\n+\t\t\tlen == wa->len) {\n+\t\tstruct rte_memseg_list *found_msl;\n+\t\tint msl_idx, ret;\n+\n+\t\t/* msl is const */\n+\t\tmsl_idx = msl - mcfg->memsegs;\n+\t\tfound_msl = &mcfg->memsegs[msl_idx];\n+\n+\t\tret = rte_fbarray_attach(&found_msl->memseg_arr);\n+\n+\t\tif (ret < 0)\n+\t\t\twa->result = -rte_errno;\n+\t\telse\n+\t\t\twa->result = 0;\n+\t\treturn 1;\n+\t}\n+\treturn 0;\n+}\n+\n+int\n+rte_malloc_heap_memory_attach(const char *heap_name, void *va_addr, size_t len)\n+{\n+\tstruct rte_mem_config *mcfg = rte_eal_get_configuration()->mem_config;\n+\tstruct malloc_heap *heap = NULL;\n+\tstruct sync_mem_walk_arg wa;\n+\tint ret;\n+\n+\tif (heap_name == NULL || va_addr == NULL || len == 0 ||\n+\t\t\tstrnlen(heap_name, RTE_HEAP_NAME_MAX_LEN) == 0 ||\n+\t\t\tstrnlen(heap_name, RTE_HEAP_NAME_MAX_LEN) ==\n+\t\t\t\tRTE_HEAP_NAME_MAX_LEN) {\n+\t\trte_errno = EINVAL;\n+\t\treturn -1;\n+\t}\n+\trte_rwlock_read_lock(&mcfg->memory_hotplug_lock);\n+\n+\t/* find our heap */\n+\theap = find_named_heap(heap_name);\n+\tif (heap == NULL) {\n+\t\trte_errno = ENOENT;\n+\t\tret = -1;\n+\t\tgoto unlock;\n+\t}\n+\t/* we shouldn't be able to attach to internal heaps */\n+\tif (heap->socket_id < RTE_MAX_NUMA_NODES) {\n+\t\trte_errno = EPERM;\n+\t\tret = -1;\n+\t\tgoto unlock;\n+\t}\n+\n+\t/* find corresponding memseg list to attach to */\n+\twa.va_addr = va_addr;\n+\twa.len = len;\n+\twa.result = -ENOENT; /* fail unless explicitly told to succeed */\n+\n+\t/* we're already holding a read lock */\n+\trte_memseg_list_walk_thread_unsafe(attach_mem_walk, &wa);\n+\n+\tif (wa.result < 0) {\n+\t\trte_errno = -wa.result;\n+\t\tret = -1;\n+\t} else {\n+\t\tret = 0;\n+\t}\n+unlock:\n+\trte_rwlock_read_unlock(&mcfg->memory_hotplug_lock);\n+\treturn ret;\n+}\n+\n int\n rte_malloc_heap_create(const char *heap_name)\n {\ndiff --git a/lib/librte_eal/rte_eal_version.map b/lib/librte_eal/rte_eal_version.map\nindex f10c34130..822c5693a 100644\n--- a/lib/librte_eal/rte_eal_version.map\n+++ b/lib/librte_eal/rte_eal_version.map\n@@ -315,6 +315,7 @@ EXPERIMENTAL {\n \trte_malloc_heap_destroy;\n \trte_malloc_heap_get_socket;\n \trte_malloc_heap_memory_add;\n+\trte_malloc_heap_memory_attach;\n \trte_malloc_heap_memory_remove;\n \trte_mem_alloc_validator_register;\n \trte_mem_alloc_validator_unregister;\n",
    "prefixes": [
        "14/16"
    ]
}