e1000: PHY loopback mode support

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>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

diff --git a/hw/e1000.c b/hw/e1000.c
index 4e787bc2cf2a1480e9c898088867ba65218ec31c..4a09e39975f4d7eccf48f7012aae816a6807ba60 100644 (file)
--- a/hw/e1000.c
+++ b/hw/e1000.c
@@ -391,6 +391,16 @@ fcs_len(E1000State *s)
     return (s->mac_reg[RCTL] & E1000_RCTL_SECRC) ? 0 : 4;
 }
 
+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)
 {
@@ -440,9 +450,9 @@ 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];