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{
    "id": 42299,
    "url": "http://patches.dpdk.org/api/patches/42299/",
    "web_url": "http://patches.dpdk.org/patch/42299/",
    "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": "<1530776333-30318-7-git-send-email-jia.guo@intel.com>",
    "date": "2018-07-05T07:38:53",
    "name": "[V5,6/7] eal: add failure handle mechanism for hotplug",
    "commit_ref": null,
    "pull_url": null,
    "state": "superseded",
    "archived": true,
    "hash": "9df3315c6029c4a2403f53fb14d1aae29ba157c2",
    "submitter": {
        "id": 507,
        "url": "http://patches.dpdk.org/api/people/507/",
        "name": "Jeff Guo",
        "email": "jia.guo@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/42299/mbox/",
    "series": [
        {
            "id": 412,
            "url": "http://patches.dpdk.org/api/series/412/",
            "web_url": "http://patches.dpdk.org/project/dpdk/list/?series=412",
            "date": "2018-07-05T07:38:47",
            "name": "hot plug failure handle mechanism",
            "version": 5,
            "mbox": "http://patches.dpdk.org/series/412/mbox/"
        }
    ],
    "comments": "http://patches.dpdk.org/api/patches/42299/comments/",
    "check": "warning",
    "checks": "http://patches.dpdk.org/api/patches/42299/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 2.7.4",
        "Received": [
            "from [92.243.14.124] (localhost [127.0.0.1])\n\tby dpdk.org (Postfix) with ESMTP id EFC081BEC5;\n\tThu,  5 Jul 2018 09:41:24 +0200 (CEST)",
            "from mga09.intel.com (mga09.intel.com [134.134.136.24])\n\tby dpdk.org (Postfix) with ESMTP id 4A2A51BEC5\n\tfor <dev@dpdk.org>; Thu,  5 Jul 2018 09:41:23 +0200 (CEST)",
            "from fmsmga007.fm.intel.com ([10.253.24.52])\n\tby orsmga102.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384;\n\t05 Jul 2018 00:41:22 -0700",
            "from jeffguo-z170x-ud5.sh.intel.com (HELO localhost.localdomain)\n\t([10.67.104.10])\n\tby fmsmga007.fm.intel.com with ESMTP; 05 Jul 2018 00:41:19 -0700"
        ],
        "References": "<1498711073-42917-1-git-send-email-jia.guo@intel.com>\n\t<1530776333-30318-1-git-send-email-jia.guo@intel.com>",
        "X-Amp-File-Uploaded": "False",
        "X-BeenThere": "dev@dpdk.org",
        "Message-Id": "<1530776333-30318-7-git-send-email-jia.guo@intel.com>",
        "X-IronPort-AV": "E=Sophos;i=\"5.51,311,1526367600\"; d=\"scan'208\";a=\"52144080\"",
        "List-Id": "DPDK patches and discussions <dev.dpdk.org>",
        "Precedence": "list",
        "From": "Jeff Guo <jia.guo@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": "<1530776333-30318-1-git-send-email-jia.guo@intel.com>",
        "List-Subscribe": "<https://mails.dpdk.org/listinfo/dev>,\n\t<mailto:dev-request@dpdk.org?subject=subscribe>",
        "To": "stephen@networkplumber.org, bruce.richardson@intel.com,\n\tferruh.yigit@intel.com, konstantin.ananyev@intel.com,\n\tgaetan.rivet@6wind.com, jingjing.wu@intel.com, thomas@monjalon.net,\n\tmotih@mellanox.com, matan@mellanox.com, harry.van.haaren@intel.com,\n\tqi.z.zhang@intel.com, shaopeng.he@intel.com, bernard.iremonger@intel.com",
        "Delivered-To": "patchwork@dpdk.org",
        "List-Unsubscribe": "<https://mails.dpdk.org/options/dev>,\n\t<mailto:dev-request@dpdk.org?subject=unsubscribe>",
        "Date": "Thu,  5 Jul 2018 15:38:53 +0800",
        "Cc": "jblunck@infradead.org, shreyansh.jain@nxp.com, dev@dpdk.org,\n\tjia.guo@intel.com, helin.zhang@intel.com",
        "List-Archive": "<http://mails.dpdk.org/archives/dev/>",
        "Subject": "[dpdk-dev] [PATCH V5 6/7] eal: add failure handle mechanism for\n\thotplug"
    },
    "content": "This patch introduces a failure handler mechanism to handle device\nhot plug removal event.\n\nFirst register sigbus handler, once sigbus error be captured, will\ncheck the failure address and accordingly remap the invalid memory\nfor the corresponding device. Bese on this mechanism, it could\nguaranty the application not to be crash when hotplug out device.\n\nSigned-off-by: Jeff Guo <jia.guo@intel.com>\n---\nv5->v4:\nadd sigbus old handler recover.\n---\n lib/librte_eal/linuxapp/eal/eal_dev.c | 111 +++++++++++++++++++++++++++++++++-\n 1 file changed, 110 insertions(+), 1 deletion(-)",
    "diff": "diff --git a/lib/librte_eal/linuxapp/eal/eal_dev.c b/lib/librte_eal/linuxapp/eal/eal_dev.c\nindex 1cf6aeb..a22cb9a 100644\n--- a/lib/librte_eal/linuxapp/eal/eal_dev.c\n+++ b/lib/librte_eal/linuxapp/eal/eal_dev.c\n@@ -4,6 +4,8 @@\n \n #include <string.h>\n #include <unistd.h>\n+#include <fcntl.h>\n+#include <signal.h>\n #include <sys/socket.h>\n #include <linux/netlink.h>\n \n@@ -14,15 +16,28 @@\n #include <rte_malloc.h>\n #include <rte_interrupts.h>\n #include <rte_alarm.h>\n+#include <rte_bus.h>\n+#include <rte_eal.h>\n+#include <rte_spinlock.h>\n+#include <rte_errno.h>\n \n #include \"eal_private.h\"\n \n static struct rte_intr_handle intr_handle = {.fd = -1 };\n static bool monitor_started;\n \n+extern struct rte_bus_list rte_bus_list;\n+\n #define EAL_UEV_MSG_LEN 4096\n #define EAL_UEV_MSG_ELEM_LEN 128\n \n+/* spinlock for device failure process */\n+static rte_spinlock_t dev_failure_lock = RTE_SPINLOCK_INITIALIZER;\n+\n+static struct sigaction sigbus_action_old;\n+\n+static int sigbus_need_recover;\n+\n static void dev_uev_handler(__rte_unused void *param);\n \n /* identify the system layer which reports this event. */\n@@ -33,6 +48,49 @@ enum eal_dev_event_subsystem {\n \tEAL_DEV_EVENT_SUBSYSTEM_MAX\n };\n \n+static void\n+sigbus_action_recover(void)\n+{\n+\tif (sigbus_need_recover) {\n+\t\tsigaction(SIGBUS, &sigbus_action_old, NULL);\n+\t\tsigbus_need_recover = 0;\n+\t}\n+}\n+\n+static void sigbus_handler(int signum, siginfo_t *info,\n+\t\t\t\tvoid *ctx __rte_unused)\n+{\n+\tint ret;\n+\n+\tRTE_LOG(INFO, EAL, \"Thread[%d] catch SIGBUS, fault address:%p\\n\",\n+\t\t(int)pthread_self(), info->si_addr);\n+\n+\trte_spinlock_lock(&dev_failure_lock);\n+\tret = rte_bus_sigbus_handler(info->si_addr);\n+\trte_spinlock_unlock(&dev_failure_lock);\n+\tif (ret == -1) {\n+\t\trte_exit(EXIT_FAILURE,\n+\t\t\t \"Failed to handle SIGBUS for hotplug, \"\n+\t\t\t \"(rte_errno: %s)!\", strerror(rte_errno));\n+\t} else if (ret == 1) {\n+\t\tif (sigbus_action_old.sa_handler)\n+\t\t\t(*(sigbus_action_old.sa_handler))(signum);\n+\t\telse\n+\t\t\trte_exit(EXIT_FAILURE,\n+\t\t\t\t \"Failed to handle generic SIGBUS!\");\n+\t}\n+\n+\tRTE_LOG(INFO, EAL, \"Success to handle SIGBUS for hotplug!\\n\");\n+}\n+\n+static int cmp_dev_name(const struct rte_device *dev,\n+\tconst void *_name)\n+{\n+\tconst char *name = _name;\n+\n+\treturn strcmp(dev->name, name);\n+}\n+\n static int\n dev_uev_socket_fd_create(void)\n {\n@@ -147,6 +205,9 @@ dev_uev_handler(__rte_unused void *param)\n \tstruct rte_dev_event uevent;\n \tint ret;\n \tchar buf[EAL_UEV_MSG_LEN];\n+\tstruct rte_bus *bus;\n+\tstruct rte_device *dev;\n+\tconst char *busname;\n \n \tmemset(&uevent, 0, sizeof(struct rte_dev_event));\n \tmemset(buf, 0, EAL_UEV_MSG_LEN);\n@@ -171,13 +232,50 @@ dev_uev_handler(__rte_unused void *param)\n \tRTE_LOG(DEBUG, EAL, \"receive uevent(name:%s, type:%d, subsystem:%d)\\n\",\n \t\tuevent.devname, uevent.type, uevent.subsystem);\n \n-\tif (uevent.devname)\n+\tswitch (uevent.subsystem) {\n+\tcase EAL_DEV_EVENT_SUBSYSTEM_PCI:\n+\tcase EAL_DEV_EVENT_SUBSYSTEM_UIO:\n+\t\tbusname = \"pci\";\n+\t\tbreak;\n+\tdefault:\n+\t\tbreak;\n+\t}\n+\n+\tif (uevent.devname) {\n+\t\tif (uevent.type == RTE_DEV_EVENT_REMOVE) {\n+\t\t\trte_spinlock_lock(&dev_failure_lock);\n+\t\t\tbus = rte_bus_find_by_name(busname);\n+\t\t\tif (bus == NULL) {\n+\t\t\t\tRTE_LOG(ERR, EAL, \"Cannot find bus (%s)\\n\",\n+\t\t\t\t\tbusname);\n+\t\t\t\treturn;\n+\t\t\t}\n+\n+\t\t\tdev = bus->find_device(NULL, cmp_dev_name,\n+\t\t\t\t\t       uevent.devname);\n+\t\t\tif (dev == NULL) {\n+\t\t\t\tRTE_LOG(ERR, EAL, \"Cannot find device (%s) on \"\n+\t\t\t\t\t\"bus (%s)\\n\", uevent.devname, busname);\n+\t\t\t\treturn;\n+\t\t\t}\n+\n+\t\t\tret = bus->hotplug_failure_handler(dev);\n+\t\t\trte_spinlock_unlock(&dev_failure_lock);\n+\t\t\tif (ret) {\n+\t\t\t\tRTE_LOG(ERR, EAL, \"Can not handle hotplug for \"\n+\t\t\t\t\t\"device (%s)\\n\", dev->name);\n+\t\t\t\treturn;\n+\t\t\t}\n+\t\t}\n \t\tdev_callback_process(uevent.devname, uevent.type);\n+\t}\n }\n \n int __rte_experimental\n rte_dev_event_monitor_start(void)\n {\n+\tsigset_t mask;\n+\tstruct sigaction action;\n \tint ret;\n \n \tif (monitor_started)\n@@ -197,6 +295,14 @@ rte_dev_event_monitor_start(void)\n \t\treturn -1;\n \t}\n \n+\t/* register sigbus handler */\n+\tsigemptyset(&mask);\n+\tsigaddset(&mask, SIGBUS);\n+\taction.sa_flags = SA_SIGINFO;\n+\taction.sa_mask = mask;\n+\taction.sa_sigaction = sigbus_handler;\n+\tsigbus_need_recover = !sigaction(SIGBUS, &action, &sigbus_action_old);\n+\n \tmonitor_started = true;\n \n \treturn 0;\n@@ -217,8 +323,11 @@ rte_dev_event_monitor_stop(void)\n \t\treturn ret;\n \t}\n \n+\tsigbus_action_recover();\n+\n \tclose(intr_handle.fd);\n \tintr_handle.fd = -1;\n \tmonitor_started = false;\n+\n \treturn 0;\n }\n",
    "prefixes": [
        "V5",
        "6/7"
    ]
}