From: Vladislav Yasevich <vyasevic@redhat.com>
Date: Tue, 1 Sep 2015 15:26:46 +0000 (-0400)
Subject: rtl8139: Do not consume the packet during overflow in standard mode.
X-Git-Tag: v2.5.0-rc0~160^2~2
X-Git-Url: http://xenbits.xensource.com/gitweb?a=commitdiff_plain;h=26c4e7ca72d970d120f0f51244bc8d37458512a0;p=qemu-xen-unstable.git

rtl8139: Do not consume the packet during overflow in standard mode.

When operation in standard mode, we currently return the size
of packet during buffer overflow.  This consumes the overflow
packet.  Return 0 instead so we can re-process the overflow packet
when we have room.

This fixes issues with lost/dropped fragments of large messages.

Signed-off-by: Vladislav Yasevich <vyasevic@redhat.com>
Reviewed-by: Jason Wang <jasowang@redhat.com>
Message-id: 1441121206-6997-3-git-send-email-vyasevic@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
---

diff --git a/hw/net/rtl8139.c b/hw/net/rtl8139.c
index 960580b910..fb2c55ce0b 100644
--- a/hw/net/rtl8139.c
+++ b/hw/net/rtl8139.c
@@ -1157,7 +1157,7 @@ static ssize_t rtl8139_do_receive(NetClientState *nc, const uint8_t *buf, size_t
             s->IntrStatus |= RxOverflow;
             ++s->RxMissed;
             rtl8139_update_irq(s);
-            return size_;
+            return 0;
         }
 
         packet_header |= RxStatusOK;