From 461473595d1dd1131cb060c460c87ca7b652939e Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Bj=C3=B8rn=20Mork?= Date: Wed, 17 Aug 2011 11:03:14 +0200 Subject: [PATCH] e1000: use MII status register for link up/down MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Some guests will use the standard MII status register to verify link state. They will not notice link changes unless this register is updated. Verified with Linux 3.0 and Windows XP guests. Without this patch, ethtool will report speed and duplex as unknown when the link is down, but still report the link as up. This is because the Linux e1000 driver checks the mac_reg[STATUS] register link state before it checks speed and duplex, but uses the phy_reg[PHY_STATUS] register for the actual link state check. Fix by updating both registers on link state changes. Linux guest before: (qemu) set_link e1000.0 off kvm-sid:~# ethtool eth0 Settings for eth0: Supported ports: [ TP ] Supported link modes: 10baseT/Half 10baseT/Full 100baseT/Half 100baseT/Full 1000baseT/Full Supports auto-negotiation: Yes Advertised link modes: 10baseT/Half 10baseT/Full 100baseT/Half 100baseT/Full 1000baseT/Full Advertised pause frame use: No Advertised auto-negotiation: Yes Speed: Unknown! Duplex: Unknown! (255) Port: Twisted Pair PHYAD: 0 Transceiver: internal Auto-negotiation: on MDI-X: Unknown Supports Wake-on: umbg Wake-on: d Current message level: 0x00000007 (7) drv probe link Link detected: yes (qemu) set_link e1000.0 on Linux guest after: (qemu) set_link e1000.0 off [ 63.384221] e1000: eth0 NIC Link is Down kvm-sid:~# ethtool eth0 Settings for eth0: Supported ports: [ TP ] Supported link modes: 10baseT/Half 10baseT/Full 100baseT/Half 100baseT/Full 1000baseT/Full Supports auto-negotiation: Yes Advertised link modes: 10baseT/Half 10baseT/Full 100baseT/Half 100baseT/Full 1000baseT/Full Advertised pause frame use: No Advertised auto-negotiation: Yes Speed: Unknown! Duplex: Unknown! (255) Port: Twisted Pair PHYAD: 0 Transceiver: internal Auto-negotiation: on MDI-X: Unknown Supports Wake-on: umbg Wake-on: d Current message level: 0x00000007 (7) drv probe link Link detected: no (qemu) set_link e1000.0 on [ 84.304582] e1000: eth0 NIC Link is Up 1000 Mbps Full Duplex, Flow Control: RX Signed-off-by: Bjørn Mork Signed-off-by: Anthony Liguori (cherry picked from commit d4044c2a6b9ba4a00dd653f515a4b0ebfcb7e125) Signed-off-by: Andreas Färber --- hw/e1000.c | 7 +++++-- hw/e1000_hw.h | 17 +++++++++++++++++ 2 files changed, 22 insertions(+), 2 deletions(-) diff --git a/hw/e1000.c b/hw/e1000.c index 96d84f9..e4d9ab5 100644 --- a/hw/e1000.c +++ b/hw/e1000.c @@ -624,10 +624,13 @@ e1000_set_link_status(VLANClientState *nc) E1000State *s = DO_UPCAST(NICState, nc, nc)->opaque; uint32_t old_status = s->mac_reg[STATUS]; - if (nc->link_down) + if (nc->link_down) { s->mac_reg[STATUS] &= ~E1000_STATUS_LU; - else + s->phy_reg[PHY_STATUS] &= ~MII_SR_LINK_STATUS; + } else { s->mac_reg[STATUS] |= E1000_STATUS_LU; + s->phy_reg[PHY_STATUS] |= MII_SR_LINK_STATUS; + } if (s->mac_reg[STATUS] != old_status) set_ics(s, 0, E1000_ICR_LSC); diff --git a/hw/e1000_hw.h b/hw/e1000_hw.h index 9bd8a4b..2e341ac 100644 --- a/hw/e1000_hw.h +++ b/hw/e1000_hw.h @@ -349,6 +349,23 @@ #define M88E1000_PHY_VCO_REG_BIT8 0x100 /* Bits 8 & 11 are adjusted for */ #define M88E1000_PHY_VCO_REG_BIT11 0x800 /* improved BER performance */ +/* PHY Status Register */ +#define MII_SR_EXTENDED_CAPS 0x0001 /* Extended register capabilities */ +#define MII_SR_JABBER_DETECT 0x0002 /* Jabber Detected */ +#define MII_SR_LINK_STATUS 0x0004 /* Link Status 1 = link */ +#define MII_SR_AUTONEG_CAPS 0x0008 /* Auto Neg Capable */ +#define MII_SR_REMOTE_FAULT 0x0010 /* Remote Fault Detect */ +#define MII_SR_AUTONEG_COMPLETE 0x0020 /* Auto Neg Complete */ +#define MII_SR_PREAMBLE_SUPPRESS 0x0040 /* Preamble may be suppressed */ +#define MII_SR_EXTENDED_STATUS 0x0100 /* Ext. status info in Reg 0x0F */ +#define MII_SR_100T2_HD_CAPS 0x0200 /* 100T2 Half Duplex Capable */ +#define MII_SR_100T2_FD_CAPS 0x0400 /* 100T2 Full Duplex Capable */ +#define MII_SR_10T_HD_CAPS 0x0800 /* 10T Half Duplex Capable */ +#define MII_SR_10T_FD_CAPS 0x1000 /* 10T Full Duplex Capable */ +#define MII_SR_100X_HD_CAPS 0x2000 /* 100X Half Duplex Capable */ +#define MII_SR_100X_FD_CAPS 0x4000 /* 100X Full Duplex Capable */ +#define MII_SR_100T4_CAPS 0x8000 /* 100T4 Capable */ + /* Interrupt Cause Read */ #define E1000_ICR_TXDW 0x00000001 /* Transmit desc written back */ #define E1000_ICR_TXQE 0x00000002 /* Transmit Queue empty */ -- 1.7.11.2