net: add API to disable/enable polling

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>

2 files changed, 11 insertions, 0 deletions

diff --git a/net.h b/net.h
index 4971fcbbb5..116bb80119 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 0d8b424123..d3492de116 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,
 };