[Qemu-devel] [PATCH 15/16] net: determine if packets can be sent before net queue deliver packets

[Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>]

From: Zhi Yong Wu <wuzhy@linux.vnet.ibm.com>

Reviewed-by:   Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Zhi Yong Wu <wuzhy@linux.vnet.ibm.com>
Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
---
 net/queue.c      |    9 +++++----
 net/slirp.c      |    7 -------
 slirp/if.c       |    5 -----
 slirp/libslirp.h |    1 -
 4 files changed, 5 insertions(+), 17 deletions(-)

diff --git a/net/queue.c b/net/queue.c
index 0afd783..e8030aa 100644
--- a/net/queue.c
+++ b/net/queue.c
@@ -176,8 +176,8 @@ ssize_t qemu_net_queue_send(NetQueue *queue,
 {
     ssize_t ret;
 
-    if (queue->delivering) {
-        return qemu_net_queue_append(queue, sender, flags, data, size, NULL);
+    if (queue->delivering || !qemu_can_send_packet(sender)) {
+        return qemu_net_queue_append(queue, sender, flags, data, size, sent_cb);
     }
 
     ret = qemu_net_queue_deliver(queue, sender, flags, data, size);
@@ -200,8 +200,9 @@ ssize_t qemu_net_queue_send_iov(NetQueue *queue,
 {
     ssize_t ret;
 
-    if (queue->delivering) {
-        return qemu_net_queue_append_iov(queue, sender, flags, iov, iovcnt, NULL);
+    if (queue->delivering || !qemu_can_send_packet(sender)) {
+        return qemu_net_queue_append_iov(queue, sender, flags,
+                                         iov, iovcnt, sent_cb);
     }
 
     ret = qemu_net_queue_deliver_iov(queue, sender, flags, iov, iovcnt);
diff --git a/net/slirp.c b/net/slirp.c
index 594cf10..c5771b9 100644
--- a/net/slirp.c
+++ b/net/slirp.c
@@ -97,13 +97,6 @@ static void slirp_smb_cleanup(SlirpState *s);
 static inline void slirp_smb_cleanup(SlirpState *s) { }
 #endif
 
-int slirp_can_output(void *opaque)
-{
-    SlirpState *s = opaque;
-
-    return qemu_can_send_packet(&s->nc);
-}
-
 void slirp_output(void *opaque, const uint8_t *pkt, int pkt_len)
 {
     SlirpState *s = opaque;
diff --git a/slirp/if.c b/slirp/if.c
index 096cf6f..533295d 100644
--- a/slirp/if.c
+++ b/slirp/if.c
@@ -177,11 +177,6 @@ void if_start(Slirp *slirp)
     }
 
     while (ifm_next) {
-        /* check if we can really output */
-        if (!slirp_can_output(slirp->opaque)) {
-            break;
-        }
-
         ifm = ifm_next;
         from_batchq = next_from_batchq;
 
diff --git a/slirp/libslirp.h b/slirp/libslirp.h
index 77527ad..9b471b5 100644
--- a/slirp/libslirp.h
+++ b/slirp/libslirp.h
@@ -25,7 +25,6 @@ void slirp_select_poll(fd_set *readfds, fd_set *writefds, fd_set *xfds,
 void slirp_input(Slirp *slirp, const uint8_t *pkt, int pkt_len);
 
 /* you must provide the following functions: */
-int slirp_can_output(void *opaque);
 void slirp_output(void *opaque, const uint8_t *pkt, int pkt_len);
 
 int slirp_add_hostfwd(Slirp *slirp, int is_udp,
-- 
1.7.10.4