From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:42600) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1cgNpO-0004iC-NP for qemu-devel@nongnu.org; Tue, 21 Feb 2017 22:42:55 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1cgNpJ-0002uk-R7 for qemu-devel@nongnu.org; Tue, 21 Feb 2017 22:42:54 -0500 Received: from [45.249.212.187] (port=2538 helo=dggrg01-dlp.huawei.com) by eggs.gnu.org with esmtps (TLS1.0:RSA_ARCFOUR_SHA1:16) (Exim 4.71) (envelope-from ) id 1cgNpI-0002pk-Rb for qemu-devel@nongnu.org; Tue, 21 Feb 2017 22:42:49 -0500 From: zhanghailiang Date: Wed, 22 Feb 2017 11:42:02 +0800 Message-ID: <1487734936-43472-2-git-send-email-zhang.zhanghailiang@huawei.com> In-Reply-To: <1487734936-43472-1-git-send-email-zhang.zhanghailiang@huawei.com> References: <1487734936-43472-1-git-send-email-zhang.zhanghailiang@huawei.com> MIME-Version: 1.0 Content-Type: text/plain Subject: [Qemu-devel] [PATCH 01/15] net/colo: Add notifier/callback related helpers for filter List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org, dgilbert@redhat.com, zhangchen.fnst@cn.fujitsu.com Cc: lizhijian@cn.fujitsu.com, xiecl.fnst@cn.fujitsu.com, zhanghailiang , Jason Wang We will use this notifier to help COLO to notify filter object to do something, like do checkpoint, or process failover event. Cc: Jason Wang Signed-off-by: zhanghailiang --- net/colo.c | 92 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ net/colo.h | 18 ++++++++++++ 2 files changed, 110 insertions(+) diff --git a/net/colo.c b/net/colo.c index 8cc166b..1697150 100644 --- a/net/colo.c +++ b/net/colo.c @@ -15,6 +15,7 @@ #include "qemu/osdep.h" #include "trace.h" #include "net/colo.h" +#include "qapi/error.h" uint32_t connection_key_hash(const void *opaque) { @@ -209,3 +210,94 @@ Connection *connection_get(GHashTable *connection_track_table, return conn; } + +static gboolean +filter_notify_prepare(GSource *source, gint *timeout) +{ + *timeout = -1; + + return FALSE; +} + +static gboolean +filter_notify_check(GSource *source) +{ + FilterNotifier *notify = (FilterNotifier *)source; + + return notify->pfd.revents & (G_IO_IN | G_IO_HUP | G_IO_ERR); +} + +static gboolean +filter_notify_dispatch(GSource *source, + GSourceFunc callback, + gpointer user_data) +{ + FilterNotifier *notify = (FilterNotifier *)source; + int revents; + int ret; + + revents = notify->pfd.revents & notify->pfd.events; + if (revents & (G_IO_IN | G_IO_HUP | G_IO_ERR)) { + ret = event_notifier_test_and_clear(¬ify->event); + if (notify->cb) { + notify->cb(notify, ret); + } + } + return TRUE; +} + +static void +filter_notify_finalize(GSource *source) +{ + FilterNotifier *notify = (FilterNotifier *)source; + + event_notifier_cleanup(¬ify->event); +} + +static GSourceFuncs notifier_source_funcs = { + filter_notify_prepare, + filter_notify_check, + filter_notify_dispatch, + filter_notify_finalize, +}; + +FilterNotifier *filter_noitifier_new(FilterNotifierCallback *cb, + void *opaque, Error **errp) +{ + FilterNotifier *notify; + int ret; + + notify = (FilterNotifier *)g_source_new(¬ifier_source_funcs, + sizeof(FilterNotifier)); + ret = event_notifier_init(¬ify->event, false); + if (ret < 0) { + error_setg_errno(errp, -ret, "Failed to initialize event notifier"); + goto fail; + } + notify->pfd.fd = event_notifier_get_fd(¬ify->event); + notify->pfd.events = G_IO_IN | G_IO_HUP | G_IO_ERR; + notify->cb = cb; + notify->opaque = opaque; + g_source_add_poll(¬ify->source, ¬ify->pfd); + + return notify; + +fail: + g_source_destroy(¬ify->source); + return NULL; +} + +int filter_notifier_set(FilterNotifier *notify, uint64_t value) +{ + ssize_t ret; + + do { + ret = write(notify->event.wfd, &value, sizeof(value)); + } while (ret < 0 && errno == EINTR); + + /* EAGAIN is fine, a read must be pending. */ + if (ret < 0 && errno != EAGAIN) { + return -errno; + } + return 0; +} diff --git a/net/colo.h b/net/colo.h index cd9027f..00f03b5 100644 --- a/net/colo.h +++ b/net/colo.h @@ -19,6 +19,7 @@ #include "qemu/jhash.h" #include "qemu/timer.h" #include "slirp/tcp.h" +#include "qemu/event_notifier.h" #define HASHTABLE_MAX_SIZE 16384 @@ -89,4 +90,21 @@ void connection_hashtable_reset(GHashTable *connection_track_table); Packet *packet_new(const void *data, int size); void packet_destroy(void *opaque, void *user_data); +typedef void FilterNotifierCallback(void *opaque, int value); +typedef struct FilterNotifier { + GSource source; + EventNotifier event; + GPollFD pfd; + FilterNotifierCallback *cb; + void *opaque; +} FilterNotifier; + +FilterNotifier *filter_noitifier_new(FilterNotifierCallback *cb, + void *opaque, Error **errp); +int filter_notifier_set(FilterNotifier *notify, uint64_t value); + +enum { + COLO_CHECKPOINT = 2, + COLO_FAILOVER, +}; #endif /* QEMU_COLO_PROXY_H */ -- 1.8.3.1