[Qemu-devel] [PATCH 3/7] e1000: PHY loopback mode support

[Jason Wang <jasowang@redhat.com>]

The missing of loopback mode prevent the running of self diagnosis
program in guest. This patch adds this support.

After this patch, loopback test of ethtool were passed in guest.

Signed-off-by: Jason Wang <jasowang@redhat.com>
---
 hw/e1000.c |   14 ++++++++++++--
 1 files changed, 12 insertions(+), 2 deletions(-)

diff --git a/hw/e1000.c b/hw/e1000.c
index dd6a97d..bc26a0c 100644
--- a/hw/e1000.c
+++ b/hw/e1000.c
@@ -352,6 +352,16 @@ fcs_len(E1000State *s)
 }
 
 static void
+e1000_send_packet(E1000State *s, const uint8_t *buf, int size)
+{
+    if (s->phy_reg[PHY_CTRL] & MII_CR_LOOPBACK) {
+        s->nic->nc.info->receive(&s->nic->nc, buf, size);
+    } else {
+        qemu_send_packet(&s->nic->nc, buf, size);
+    }
+}
+
+static void
 xmit_seg(E1000State *s)
 {
     uint16_t len, *sp;
@@ -400,9 +410,9 @@ xmit_seg(E1000State *s)
         memmove(tp->vlan, tp->data, 4);
         memmove(tp->data, tp->data + 4, 8);
         memcpy(tp->data + 8, tp->vlan_header, 4);
-        qemu_send_packet(&s->nic->nc, tp->vlan, tp->size + 4);
+        e1000_send_packet(s, tp->vlan, tp->size + 4);
     } else
-        qemu_send_packet(&s->nic->nc, tp->data, tp->size);
+        e1000_send_packet(s, tp->data, tp->size);
     s->mac_reg[TPT]++;
     s->mac_reg[GPTC]++;
     n = s->mac_reg[TOTL];