Re: [Qemu-devel] [RFC PATCH 3/9] colo-proxy: add colo-proxy framework

[Zhang Chen <zhangchen.fnst@cn.fujitsu.com>]

On 11/30/2015 11:10 AM, Wen Congyang wrote:
> On 11/27/2015 08:27 PM, Zhang Chen wrote:
>> From: zhangchen <zhangchen.fnst@cn.fujitsu.com>
>>
>> Colo-proxy is a plugin of qemu netfilter
>> like filter-buffer and dump
>>
>> Signed-off-by: zhangchen <zhangchen.fnst@cn.fujitsu.com>
>> ---
>>   net/Makefile.objs |   1 +
>>   net/colo-proxy.c  | 139 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
>>   net/colo-proxy.h  |  63 +++++++++++++++++++++++++
>>   3 files changed, 203 insertions(+)
>>   create mode 100644 net/colo-proxy.c
>>   create mode 100644 net/colo-proxy.h
>>
>> diff --git a/net/Makefile.objs b/net/Makefile.objs
>> index 5fa2f97..95670f2 100644
>> --- a/net/Makefile.objs
>> +++ b/net/Makefile.objs
>> @@ -15,3 +15,4 @@ common-obj-$(CONFIG_VDE) += vde.o
>>   common-obj-$(CONFIG_NETMAP) += netmap.o
>>   common-obj-y += filter.o
>>   common-obj-y += filter-buffer.o
>> +common-obj-y += colo-proxy.o
>> diff --git a/net/colo-proxy.c b/net/colo-proxy.c
>> new file mode 100644
>> index 0000000..98c2699
>> --- /dev/null
>> +++ b/net/colo-proxy.c
>> @@ -0,0 +1,139 @@
>> +/*
>> + * COarse-grain LOck-stepping Virtual Machines for Non-stop Service (COLO)
>> + * (a.k.a. Fault Tolerance or Continuous Replication)
>> + *
>> + * Copyright (c) 2015 HUAWEI TECHNOLOGIES CO., LTD.
>> + * Copyright (c) 2015 FUJITSU LIMITED
>> + * Copyright (c) 2015 Intel Corporation
>> + *
>> + * Author: Zhang Chen <zhangchen.fnst@cn.fujitsu.com>
>> + *
>> + * This work is licensed under the terms of the GNU GPL, version 2 or
>> + * later.  See the COPYING file in the top-level directory.
>> + */
>> +
>> +#include "colo-proxy.h"
>> +
>> +#define __DEBUG__
>> +
>> +#ifdef __DEBUG__
>> +#define DEBUG(format, ...) printf(format, ##__VA_ARGS__)
>> +#else
>> +#define DEBUG(format, ...)
>> +#endif
>> +
>> +
>> +static ssize_t colo_proxy_receive_iov(NetFilterState *nf,
>> +                                         NetClientState *sender,
>> +                                         unsigned flags,
>> +                                         const struct iovec *iov,
>> +                                         int iovcnt,
>> +                                         NetPacketSent *sent_cb)
>> +{
>> +    /*
>> +     * We return size when buffer a packet, the sender will take it as
>> +     * a already sent packet, so sent_cb should not be called later.
>> +     *
>> +     */
>> +    ColoProxyState *s = FILTER_COLO_PROXY(nf);
>> +    if (s->colo_mode == COLO_PRIMARY_MODE) {
>> +         /* colo_proxy_primary_handler */
>> +    } else {
>> +         /* colo_proxy_primary_handler */
>> +    }
>> +    return iov_size(iov, iovcnt);
>> +}
>> +
>> +static void colo_proxy_cleanup(NetFilterState *nf)
>> +{
>> +     /* cleanup */
>> +}
>> +
>> +
>> +static void colo_proxy_setup(NetFilterState *nf, Error **errp)
>> +{
>> +    ColoProxyState *s = FILTER_COLO_PROXY(nf);
>> +    if (!s->addr) {
>> +        error_setg(errp, "filter colo_proxy needs 'addr' \
>> +                     property set!");
>> +        return;
>> +    }
>> +
>> +    if (nf->direction != NET_FILTER_DIRECTION_ALL) {
>> +        printf("colo need queue all packet,\
> s/need/needs/

fix

thanks for review
zhangchen

>> +                    please startup colo-proxy with queue=all\n");
>> +        return;
>> +    }
>> +
>> +    s->sockfd = -1;
>> +    s->has_failover = false;
>> +    colo_do_checkpoint = false;
>> +    g_queue_init(&s->unprocessed_connections);
>> +
>> +    if (!strcmp(mode, PRIMARY_MODE)) {
>> +        s->colo_mode = COLO_PRIMARY_MODE;
>> +    } else if (!strcmp(mode, SECONDARY_MODE)) {
>> +        s->colo_mode = COLO_SECONDARY_MODE;
>> +    } else {
>> +        error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "mode",
>> +                    "primary or secondary");
>> +        return;
>> +    }
>> +}
>> +
>> +static void colo_proxy_class_init(ObjectClass *oc, void *data)
>> +{
>> +    NetFilterClass *nfc = NETFILTER_CLASS(oc);
>> +
>> +    nfc->setup = colo_proxy_setup;
>> +    nfc->cleanup = colo_proxy_cleanup;
>> +    nfc->receive_iov = colo_proxy_receive_iov;
>> +}
>> +
>> +static char *colo_proxy_get_mode(Object *obj, Error **errp)
>> +{
>> +    return g_strdup(mode);
>> +}
>> +
>> +static void colo_proxy_set_mode(Object *obj, const char *value, Error **errp)
>> +{
>> +    g_free(mode);
>> +    mode = g_strdup(value);
>> +}
>> +
>> +static char *colo_proxy_get_addr(Object *obj, Error **errp)
>> +{
>> +    ColoProxyState *s = FILTER_COLO_PROXY(obj);
>> +
>> +    return g_strdup(s->addr);
>> +}
>> +
>> +static void colo_proxy_set_addr(Object *obj, const char *value, Error **errp)
>> +{
>> +    ColoProxyState *s = FILTER_COLO_PROXY(obj);
>> +    g_free(s->addr);
>> +    s->addr = g_strdup(value);
> You can parse the address here, and can find the format error as early as possible.

ok,it will fix in next version

>> +}
>> +
>> +static void colo_proxy_init(Object *obj)
>> +{
>> +    object_property_add_str(obj, "mode", colo_proxy_get_mode,
>> +                            colo_proxy_set_mode, NULL);
>> +    object_property_add_str(obj, "addr", colo_proxy_get_addr,
>> +                            colo_proxy_set_addr, NULL);
>> +}
>> +
>> +static const TypeInfo colo_proxy_info = {
>> +    .name = TYPE_FILTER_COLO_PROXY,
>> +    .parent = TYPE_NETFILTER,
>> +    .class_init = colo_proxy_class_init,
>> +    .instance_init = colo_proxy_init,
>> +    .instance_size = sizeof(ColoProxyState),
>> +};
>> +
>> +static void register_types(void)
>> +{
>> +    type_register_static(&colo_proxy_info);
>> +}
>> +
>> +type_init(register_types);
>> diff --git a/net/colo-proxy.h b/net/colo-proxy.h
>> new file mode 100644
>> index 0000000..94afbc7
>> --- /dev/null
>> +++ b/net/colo-proxy.h
>> @@ -0,0 +1,63 @@
>> +/*
>> + * COarse-grain LOck-stepping Virtual Machines for Non-stop Service (COLO)
>> + * (a.k.a. Fault Tolerance or Continuous Replication)
>> + *
>> + * Copyright (c) 2015 HUAWEI TECHNOLOGIES CO., LTD.
>> + * Copyright (c) 2015 FUJITSU LIMITED
>> + * Copyright (c) 2015 Intel Corporation
>> + *
>> + * Author: Zhang Chen <zhangchen.fnst@cn.fujitsu.com>
>> + *
>> + * This work is licensed under the terms of the GNU GPL, version 2 or
>> + * later.  See the COPYING file in the top-level directory.
>> + */
>> +
>> +
>> +#ifndef QEMU_COLO_PROXY_H
>> +#define QEMU_COLO_PROXY_H
>> +
>> +#include "net/filter.h"
>> +#include "net/queue.h"
>> +#include "qemu-common.h"
>> +#include "qemu/iov.h"
>> +#include "qapi/qmp/qerror.h"
>> +#include "qapi-visit.h"
>> +#include "qom/object.h"
>> +#include "qemu/sockets.h"
>> +#include "qemu/main-loop.h"
>> +#include <netinet/if_ether.h>
>> +#include "qemu/jhash.h"
>> +#include "qemu/coroutine.h"
> Don't include too many header files here. You should only include the header files
> which will be used in this header file.

ok,I will move some to colo-proxy.c

>> +
>> +#define FILTER_COLO_PROXY(obj) \
>> +    OBJECT_CHECK(ColoProxyState, (obj), TYPE_FILTER_COLO_PROXY)
>> +
>> +#define TYPE_FILTER_COLO_PROXY "colo-proxy"
>> +#define PRIMARY_MODE "primary"
>> +#define SECONDARY_MODE "secondary"
>> +
>> +typedef enum {
>> +    COLO_PRIMARY_MODE,               /* primary mode  */
>> +    COLO_SECONDARY_MODE,             /* secondary mode */
>> +} mode_type;
>> +
>> +typedef struct ColoProxyState {
>> +    NetFilterState parent_obj;
>> +    NetQueue *incoming_queue;        /* guest normal net queue */
>> +    NetFilterDirection direction;    /* packet direction */
>> +    mode_type colo_mode;             /* colo mode (primary or
>> +                                      * secondary)
>> +                                      */
>> +    char *addr;                       /* primary colo connect addr
>> +                                      * or secondary server addr
>> +                                      */
>> +    int sockfd;                      /* primary client socket fd or
>> +                                      * secondary server socket fd
>> +                                      */
>> +    bool has_failover;               /* colo failover flag */
>> +    GHashTable *unprocessed_packets; /* hashtable to save connection */
>> +    GQueue unprocessed_connections;  /* to save unprocessed_connections */
>> +    Coroutine *co;
>> +} ColoProxyState;
>> +
>> +#endif /* QEMU_COLO_PROXY_H */
>>
> .
>