This callback is called by main loop before polling s->fd, if it returns
false, the fd will not be polled in this iteration.
This is redundant with checks inside read callback. After this patch,
the data will be copied from s->fd to s->iov when it arrives. If the
device can't receive, it will be queued to incoming_queue, and when the
device status changes, this queue will be flushed.
Also remove the qemu_can_send_packet() check in netmap_send. If it's
true, we are good; if it's false, the qemu_sendv_packet_async would
return 0 and read poll will be disabled until netmap_send_completed is
called.
Signed-off-by: Fam Zheng <f...@redhat.com>
---
net/netmap.c | 14 ++------------
1 file changed, 2 insertions(+), 12 deletions(-)
diff --git a/net/netmap.c b/net/netmap.c
index 69300eb..19d0542 100644
--- a/net/netmap.c
+++ b/net/netmap.c
@@ -132,23 +132,13 @@ error:
return -1;
}
-/* Tell the event-loop if the netmap backend can send packets
- to the frontend. */
-static int netmap_can_send(void *opaque)
-{
- NetmapState *s = opaque;
-
- return qemu_can_send_packet(&s->nc);
-}
-
static void netmap_send(void *opaque);
static void netmap_writable(void *opaque);
/* Set the event-loop handlers for the netmap backend. */
static void netmap_update_fd_handler(NetmapState *s)
{
- qemu_set_fd_handler2(s->me.fd,
- s->read_poll ? netmap_can_send : NULL,
+ qemu_set_fd_handler2(s->me.fd, NULL,
s->read_poll ? netmap_send : NULL,
s->write_poll ? netmap_writable : NULL,
s);
@@ -317,7 +307,7 @@ static void netmap_send(void *opaque)
/* Keep sending while there are available packets into the netmap
RX ring and the forwarding path towards the peer is open. */
- while (!nm_ring_empty(ring) && qemu_can_send_packet(&s->nc)) {
+ while (!nm_ring_empty(ring)) {
uint32_t i;
uint32_t idx;
bool morefrag;
--
2.4.2
