When vhost is bound to a backend device, we need to stop polling it when
vhost is started, and restart polling when vhost is stopped.
Add an API for that for use by vhost, and implement in tap backend.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
(cherry picked from commit ceb696159d569db5b2a7659ce38752398c236742)
---
 net.h     |    3 +++
 net/tap.c |    8 ++++++++
 2 files changed, 11 insertions(+), 0 deletions(-)

diff --git a/net.h b/net.h
index 4971fcb..116bb80 100644
--- a/net.h
+++ b/net.h
@@ -1,6 +1,7 @@
 #ifndef QEMU_NET_H
 #define QEMU_NET_H
 
+#include <stdbool.h>
 #include "qemu-queue.h"
 #include "qemu-common.h"
 #include "qdict.h"
@@ -36,6 +37,7 @@ typedef enum {
     NET_CLIENT_TYPE_DUMP
 } net_client_type;
 
+typedef void (NetPoll)(VLANClientState *, bool enable);
 typedef int (NetCanReceive)(VLANClientState *);
 typedef ssize_t (NetReceive)(VLANClientState *, const uint8_t *, size_t);
 typedef ssize_t (NetReceiveIOV)(VLANClientState *, const struct iovec *, int);
@@ -51,6 +53,7 @@ typedef struct NetClientInfo {
     NetCanReceive *can_receive;
     NetCleanup *cleanup;
     LinkStatusChanged *link_status_changed;
+    NetPoll *poll;
 } NetClientInfo;
 
 struct VLANClientState {
diff --git a/net/tap.c b/net/tap.c
index 0d8b424..d3492de 100644
--- a/net/tap.c
+++ b/net/tap.c
@@ -262,6 +262,13 @@ static void tap_cleanup(VLANClientState *nc)
     close(s->fd);
 }
 
+static void tap_poll(VLANClientState *nc, bool enable)
+{
+    TAPState *s = DO_UPCAST(TAPState, nc, nc);
+    tap_read_poll(s, enable);
+    tap_write_poll(s, enable);
+}
+
 /* fd support */
 
 static NetClientInfo net_tap_info = {
@@ -270,6 +277,7 @@ static NetClientInfo net_tap_info = {
     .receive = tap_receive,
     .receive_raw = tap_receive_raw,
     .receive_iov = tap_receive_iov,
+    .poll = tap_poll,
     .cleanup = tap_cleanup,
 };
 
-- 
1.6.6.144.g5c3af