Proxy module will send message to qemu through nfnetlink.
Now, the message only contains the result of packets comparation.
We use a global variable 'packet_compare_different' to store the result.
And this variable should be accessed by using atomic related function,
such as 'atomic_set' 'atomic_xchg'.
Signed-off-by: zhanghailiang <zhang.zhanghaili...@huawei.com>
Signed-off-by: Li Zhijian <lizhij...@cn.fujitsu.com>
---
net/colo-nic.c | 41 +++++++++++++++++++++++++++++++++++++++++
trace-events | 1 +
2 files changed, 42 insertions(+)
diff --git a/net/colo-nic.c b/net/colo-nic.c
index f4e04af..9e08fe3 100644
--- a/net/colo-nic.c
+++ b/net/colo-nic.c
@@ -21,6 +21,7 @@
#include "net/net.h"
#include "net/colo-nic.h"
#include "qemu/error-report.h"
+#include "trace.h"
/* Remove the follow define after proxy is merged into kernel,
* using #include <libnfnetlink/libnfnetlink.h> instead.
@@ -79,6 +80,7 @@ typedef struct nic_device {
static struct nfnl_handle *nfnlh;
static struct nfnl_subsys_handle *nfnlssh;
+static int32_t packet_compare_different; /* The result of packet comparing */
QTAILQ_HEAD(, nic_device) nic_devices = QTAILQ_HEAD_INITIALIZER(nic_devices);
@@ -264,6 +266,38 @@ static int colo_proxy_send(enum nfnl_colo_msg_types
msg_type,
return ret;
}
+static int __colo_rcv_pkt(struct nlmsghdr *nlh, struct nfattr *nfa[],
+ void *data)
+{
+ /* struct nfgenmsg *nfmsg = NLMSG_DATA(nlh); */
+ int32_t result = ntohl(nfnl_get_data(nfa, NFNL_COLO_COMPARE_RESULT,
+ int32_t));
+
+ atomic_set(&packet_compare_different, result);
+ trace_colo_rcv_pkt(result);
+ return 0;
+}
+
+static struct nfnl_callback colo_nic_cb = {
+ .call = &__colo_rcv_pkt,
+ .attr_count = NFNL_COLO_KERNEL_NOTIFY_MAX,
+};
+
+static void colo_proxy_recv(void *opaque)
+{
+ unsigned char *buf = g_malloc0(2048);
+ int len;
+ int ret;
+
+ len = nfnl_recv(nfnlh, buf, 2048);
+ ret = nfnl_handle_packet(nfnlh, (char *)buf, len);
+ if (ret < 0) {/* Notify colo thread the error */
+ atomic_set(&packet_compare_different, -1);
+ error_report("call nfnl_handle_packet failed");
+ }
+ g_free(buf);
+}
+
static int check_proxy_ack(void)
{
unsigned char *buf = g_malloc0(2048);
@@ -319,6 +353,11 @@ int colo_proxy_init(enum colo_mode mode)
goto err_out;
}
+ ret = nfnl_callback_register(nfnlssh, NFCOLO_KERNEL_NOTIFY, &colo_nic_cb);
+ if (ret < 0) {
+ goto err_out;
+ }
+
/* Netlink is not a reliable protocol, So it is necessary to request proxy
* module to acknowledge in the first time.
*/
@@ -338,6 +377,8 @@ int colo_proxy_init(enum colo_mode mode)
goto err_out;
}
+ qemu_set_fd_handler(nfnl_fd(nfnlh), colo_proxy_recv, NULL, NULL);
+
return 0;
err_out:
nfnl_close(nfnlh);
diff --git a/trace-events b/trace-events
index 1ce7bba..b1c263a 100644
--- a/trace-events
+++ b/trace-events
@@ -1450,6 +1450,7 @@ colo_info_load(const char *msg) "%s"
colo_vm_state_change(const char *old, const char *new) "Change '%s' => '%s'"
colo_receive_message(const char *msg) "Receive '%s'"
colo_do_failover(void) ""
+colo_rcv_pkt(int result) "Result of net packets comparing is different: %d"
# kvm-all.c
kvm_ioctl(int type, void *arg) "type 0x%x, arg %p"
--
1.7.12.4
