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authorGabriel L. Somlo <gsomlo@gmail.com>2014-06-19 11:55:33 -0400
committerMichael S. Tsirkin <mst@redhat.com>2014-06-23 17:38:00 +0300
commit6a2acedb19221ddf5e6fd3fb3590ba636aa21007 (patch)
tree902c5d5bd3a5e7dec75b4abe3424fc01a6d5bf56
parentf61badf32f1870e80e579f9dac363891a226e976 (diff)
e1000: emulate auto-negotiation during external link status change
This patch emulates auto-negotiation when the network link status is modified externally (i.e. via "set_link <id> off/on"). Also, a couple of cleanup items: - unset PHY status reg. AUTONEG_COMPLETE during link_down() - set PHY status reg. AUTONEG_COMPLETE during autoneg_timer() only if we actually brought the link up. - group all checks for "can we, and should we autonegotiate?" together for more clarity. Signed-off-by: Gabriel Somlo <somlo@cmu.edu> Reviewed-by: Alexander Graf <agraf@suse.de> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
-rw-r--r--hw/net/e1000.c35
1 files changed, 19 insertions, 16 deletions
diff --git a/hw/net/e1000.c b/hw/net/e1000.c
index 57bdffde08..9c6af069aa 100644
--- a/hw/net/e1000.c
+++ b/hw/net/e1000.c
@@ -175,6 +175,7 @@ e1000_link_down(E1000State *s)
{
s->mac_reg[STATUS] &= ~E1000_STATUS_LU;
s->phy_reg[PHY_STATUS] &= ~MII_SR_LINK_STATUS;
+ s->phy_reg[PHY_STATUS] &= ~MII_SR_AUTONEG_COMPLETE;
}
static void
@@ -197,7 +198,6 @@ set_phy_ctrl(E1000State *s, int index, uint16_t val)
}
if ((val & MII_CR_AUTO_NEG_EN) && (val & MII_CR_RESTART_AUTO_NEG)) {
e1000_link_down(s);
- s->phy_reg[PHY_STATUS] &= ~MII_SR_AUTONEG_COMPLETE;
DBGOUT(PHY, "Start link auto negotiation\n");
timer_mod(s->autoneg_timer, qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL) + 500);
}
@@ -209,9 +209,9 @@ e1000_autoneg_timer(void *opaque)
E1000State *s = opaque;
if (!qemu_get_queue(s->nic)->link_down) {
e1000_link_up(s);
+ s->phy_reg[PHY_STATUS] |= MII_SR_AUTONEG_COMPLETE;
+ DBGOUT(PHY, "Auto negotiation is completed\n");
}
- s->phy_reg[PHY_STATUS] |= MII_SR_AUTONEG_COMPLETE;
- DBGOUT(PHY, "Auto negotiation is completed\n");
}
static void (*phyreg_writeops[])(E1000State *, int, uint16_t) = {
@@ -853,7 +853,16 @@ e1000_set_link_status(NetClientState *nc)
if (nc->link_down) {
e1000_link_down(s);
} else {
- e1000_link_up(s);
+ if (s->compat_flags & E1000_FLAG_AUTONEG &&
+ s->phy_reg[PHY_CTRL] & MII_CR_AUTO_NEG_EN &&
+ s->phy_reg[PHY_CTRL] & MII_CR_RESTART_AUTO_NEG &&
+ !(s->phy_reg[PHY_STATUS] & MII_SR_AUTONEG_COMPLETE)) {
+ /* emulate auto-negotiation if supported */
+ timer_mod(s->autoneg_timer,
+ qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL) + 500);
+ } else {
+ e1000_link_up(s);
+ }
}
if (s->mac_reg[STATUS] != old_status)
@@ -1279,16 +1288,13 @@ static void e1000_pre_save(void *opaque)
e1000_mit_timer(s);
}
- if (!(s->compat_flags & E1000_FLAG_AUTONEG)) {
- return;
- }
-
/*
- * If link is down and auto-negotiation is ongoing, complete
- * auto-negotiation immediately. This allows is to look at
- * MII_SR_AUTONEG_COMPLETE to infer link status on load.
+ * If link is down and auto-negotiation is supported and ongoing,
+ * complete auto-negotiation immediately. This allows us to look
+ * at MII_SR_AUTONEG_COMPLETE to infer link status on load.
*/
if (nc->link_down &&
+ s->compat_flags & E1000_FLAG_AUTONEG &&
s->phy_reg[PHY_CTRL] & MII_CR_AUTO_NEG_EN &&
s->phy_reg[PHY_CTRL] & MII_CR_RESTART_AUTO_NEG) {
s->phy_reg[PHY_STATUS] |= MII_SR_AUTONEG_COMPLETE;
@@ -1313,11 +1319,8 @@ static int e1000_post_load(void *opaque, int version_id)
* Alternatively, restart link negotiation if it was in progress. */
nc->link_down = (s->mac_reg[STATUS] & E1000_STATUS_LU) == 0;
- if (!(s->compat_flags & E1000_FLAG_AUTONEG)) {
- return 0;
- }
-
- if (s->phy_reg[PHY_CTRL] & MII_CR_AUTO_NEG_EN &&
+ if (s->compat_flags & E1000_FLAG_AUTONEG &&
+ s->phy_reg[PHY_CTRL] & MII_CR_AUTO_NEG_EN &&
s->phy_reg[PHY_CTRL] & MII_CR_RESTART_AUTO_NEG &&
!(s->phy_reg[PHY_STATUS] & MII_SR_AUTONEG_COMPLETE)) {
nc->link_down = false;