hw/net: fix mcf_fec driver receiver

The network mcf_fec driver emulated receive side method is returning a
result of 0 causing the network layer to disable receive for this emulated
device. This results in the guest only ever receiving one packet.

Fix the recieve side processing to return the number of bytes that we
passed back through to the guest.

Signed-off-by: Greg Ungerer <gerg@uclinux.org>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-id: 1435296436-12152-5-git-send-email-gerg@uclinux.org
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

1 files changed, 3 insertions, 1 deletions

diff --git a/hw/net/mcf_fec.c b/hw/net/mcf_fec.c
index ea59017..e63af1b 100644
--- a/hw/net/mcf_fec.c
+++ b/hw/net/mcf_fec.c
@@ -413,6 +413,7 @@ static ssize_t mcf_fec_receive(NetClientState *nc, const uint8_t *buf, size_t si
     uint32_t buf_addr;
     uint8_t *crc_ptr;
     unsigned int buf_len;
+    size_t retsize;
 
     DPRINTF("do_rx len %d\n", size);
     if (!s->rx_enabled) {
@@ -432,6 +433,7 @@ static ssize_t mcf_fec_receive(NetClientState *nc, const uint8_t *buf, size_t si
         flags |= FEC_BD_LG;
     }
     addr = s->rx_descriptor;
+    retsize = size;
     while (size > 0) {
         mcf_fec_read_bd(&bd, addr);
         if ((bd.flags & FEC_BD_E) == 0) {
@@ -476,7 +478,7 @@ static ssize_t mcf_fec_receive(NetClientState *nc, const uint8_t *buf, size_t si
     s->rx_descriptor = addr;
     mcf_fec_enable_rx(s);
     mcf_fec_update(s);
-    return size;
+    return retsize;
 }
 
 static const MemoryRegionOps mcf_fec_ops = {