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e1000: use MII status register for link up/down 

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 <bjorn@mork.no>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Bjørn Mork 2011-08-17 11:03:14 +02:00 committed by Anthony Liguori
parent 2011fe5657
commit d4044c2a6b
2 changed files with 22 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
hw/e1000.c
View File

@ -617,10 +617,13 @@ 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);

17
hw/e1000_hw.h
View File

@ -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 */