net/filter-mirror: Change filter_mirror_send interface

Change filter_mirror_send interface to make it easier
to used by other filter
Signed-off-by: NZhang Chen <zhangchen.fnst@cn.fujitsu.com>
Signed-off-by: NWen Congyang <wency@cn.fujitsu.com>
Signed-off-by: NLi Zhijian <lizhijian@cn.fujitsu.com>
Signed-off-by: NJason Wang <jasowang@redhat.com>

net/filter-mirror.c

@@ -35,11 +35,10 @@ typedef struct MirrorState {
     CharDriverState *chr_out;
 } MirrorState;
 
-static int filter_mirror_send(NetFilterState *nf,
+static int filter_mirror_send(CharDriverState *chr_out,
                               const struct iovec *iov,
                               int iovcnt)
 {
-    MirrorState *s = FILTER_MIRROR(nf);
     int ret = 0;
     ssize_t size = 0;
     uint32_t len =  0;
@@ -51,14 +50,14 @@ static int filter_mirror_send(NetFilterState *nf,
     }
 
     len = htonl(size);
-    ret = qemu_chr_fe_write_all(s->chr_out, (uint8_t *)&len, sizeof(len));
+    ret = qemu_chr_fe_write_all(chr_out, (uint8_t *)&len, sizeof(len));
     if (ret != sizeof(len)) {
         goto err;
     }
 
     buf = g_malloc(size);
     iov_to_buf(iov, iovcnt, 0, buf, size);
-    ret = qemu_chr_fe_write_all(s->chr_out, (uint8_t *)buf, size);
+    ret = qemu_chr_fe_write_all(chr_out, (uint8_t *)buf, size);
     g_free(buf);
     if (ret != size) {
         goto err;
@@ -77,9 +76,10 @@ static ssize_t filter_mirror_receive_iov(NetFilterState *nf,
                                          int iovcnt,
                                          NetPacketSent *sent_cb)
 {
+    MirrorState *s = FILTER_MIRROR(nf);
     int ret;
 
-    ret = filter_mirror_send(nf, iov, iovcnt);
+    ret = filter_mirror_send(s->chr_out, iov, iovcnt);
     if (ret) {
         error_report("filter_mirror_send failed(%s)", strerror(-ret));
     }