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>

diff --git a/net.h b/net.h
index 4971fcbbb525cb0020d100e61f34d55f95d116be..116bb80119d10b82deb6d6bb7f5cd287a4bf3374 100644 (file)
--- 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 0d8b42412321a75d5a529560ab67ad1055b06ac9..d3492de1164d9b30cb6fb9b9e6151a84b8541b1d 100644 (file)
--- 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,
 };