[Qemu-devel] [PATCH 1/2] e1000: no need auto-negotiation if link was down

[Amos Kong <akong@redhat.com>]

Commit b9d03e352cb6b31a66545763f6a1e20c9abf0c2c added link
auto-negotiation emulation, it would always set link up by
callback function. Problem exists if original link status
was down, link status should not be changed in auto-negotiation.

Signed-off-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Amos Kong <akong@redhat.com>
---
 hw/e1000.c |    5 +++++
 1 file changed, 5 insertions(+)

diff --git a/hw/e1000.c b/hw/e1000.c
index 92fb00a..eebcd1d 100644
--- a/hw/e1000.c
+++ b/hw/e1000.c
@@ -164,6 +164,11 @@ static void
 set_phy_ctrl(E1000State *s, int index, uint16_t val)
 {
     if ((val & MII_CR_AUTO_NEG_EN) && (val & MII_CR_RESTART_AUTO_NEG)) {
+        /* no need auto-negotiation if link was down */
+        if (s->nic->nc.link_down) {
+            s->phy_reg[PHY_STATUS] |= MII_SR_AUTONEG_COMPLETE;
+            return;
+        }
         s->nic->nc.link_down = true;
         e1000_link_down(s);
         s->phy_reg[PHY_STATUS] &= ~MII_SR_AUTONEG_COMPLETE;
-- 
1.7.10.1