Add forgotten patch

0006-rtl8139-flush-queued-packets-when-RxBufPtr-is-writte.patch

@@ -0,0 +1,47 @@
+From 4044e0670486ad089367952843f17351c4f6faa0 Mon Sep 17 00:00:00 2001
+From: Stefan Hajnoczi <stefanha@redhat.com>
+Date: Wed, 22 May 2013 14:50:18 +0200
+Subject: [PATCH] rtl8139: flush queued packets when RxBufPtr is written
+
+Net queues support efficient "receive disable".  For example, tap's file
+descriptor will not be polled while its peer has receive disabled.  This
+saves CPU cycles for needlessly copying and then dropping packets which
+the peer cannot receive.
+
+rtl8139 is missing the qemu_flush_queued_packets() call that wakes the
+queue up when receive becomes possible again.
+
+As a result, the Windows 7 guest driver reaches a state where the
+rtl8139 cannot receive packets.  The driver has actually refilled the
+receive buffer but we never resume reception.
+
+The bug can be reproduced by running a large FTP 'get' inside a Windows
+7 guest:
+
+  $ qemu -netdev tap,id=tap0,...
+         -device rtl8139,netdev=tap0
+
+The Linux guest driver does not trigger the bug, probably due to a
+different buffer management strategy.
+
+Reported-by: Oliver Francke <oliver.francke@filoo.de>
+Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
+(cherry picked from commit 00b7ade807b5ce6779ddd86ce29c5521ec5c529a)
+---
+ hw/net/rtl8139.c | 3 +++
+ 1 file changed, 3 insertions(+)
+
+diff --git a/hw/net/rtl8139.c b/hw/net/rtl8139.c
+index 9369507..7993f9f 100644
+--- a/hw/net/rtl8139.c
++++ b/hw/net/rtl8139.c
+@@ -2575,6 +2575,9 @@ static void rtl8139_RxBufPtr_write(RTL8139State *s, uint32_t val)
+     /* this value is off by 16 */
+     s->RxBufPtr = MOD2(val + 0x10, s->RxBufferSize);
+ 
++    /* more buffer space may be available so try to receive */
++    qemu_flush_queued_packets(qemu_get_queue(s->nic));
++
+     DPRINTF(" CAPR write: rx buffer length %d head 0x%04x read 0x%04x\n",
+         s->RxBufferSize, s->RxBufAddr, s->RxBufPtr);
+ }