This is just an update to my previous message. Being proactive, I was
looking at the tg3.c source to see if I could help trace down the problem.
I added a printk to the following code snippet from tg3_timer() in tg3.c
from 2.4.21-pre7:
} else if (tp->tg3_flags & TG3_FLAG_POLL_SERDES) {
u32 mac_stat = tr32(MAC_STATUS);
int need_setup = 0;
printk(KERN_DEBUG "%s: mac_stat = 0x%08X netif_carrier_ok = %d\n",
__FILE__,
mac_stat,
netif_carrier_ok(tp->dev));
if (netif_carrier_ok(tp->dev) &&
(mac_stat & MAC_STATUS_LNKSTATE_CHANGED)) {
need_setup = 1;
}
if (! netif_carrier_ok(tp->dev) &&
(mac_stat & MAC_STATUS_PCS_SYNCED)) {
need_setup = 1;
}
if (need_setup) {
tw32(MAC_MODE,
(tp->mac_mode &
~MAC_MODE_PORT_MODE_MASK));
tr32(MAC_MODE);
udelay(40);
tw32(MAC_MODE, tp->mac_mode);
tr32(MAC_MODE);
udelay(40);
tg3_setup_phy(tp);
}
}
With this added printk, I repeated the test:
(cable plugged in)
ifconfig eth0 up
tg3: eth0: Link is up at 1000 Mbps, full duplex.
tg3: eth0: Flow control is on for TX and on for RX.
tg3.c: mac_stat = 0x00C00403 netif_carrier_ok = 1
and the last message repeats every second...
(cable unplugged)
tg3.c: mac_stat = 0x04C01413 netif_carrier_ok = 1
tg3: eth0: Link is down.
tg3.c: mac_stat = 0x04C0141A netif_carrier_ok = 0
and the last message repeats every second...
(cable plugged back in)
tg3.c: mac_stat = 0x04C0141F netif_carrier_ok = 0
tg3: eth0: Link is up at 1000 Mbps, full duplex.
tg3: eth0: Flow control is on for TX and on for RX.
tg3.c: mac_stat = 0x04C00403 netif_carrier_ok = 1
and the last message repeats every second...
ifconfig eth0 down
(cable unplugged)
ifconfig eth0 up
tg3: eth0: Link is down.
tg3.c: mac_stat = 0x00C00400 netif_carrier_ok = 0
and the last message repeats every second...
(cable plugged in)
tg3.c: mac_stat = 0x00C00400 netif_carrier_ok = 0
and the last message repeats every second...
So, the problem seems to be that the value of mac_stat doesn't change when
the cable is plugged in if the interface was brought up with the cable
unplugged. Also notice that the value of mac_stat is 0x04C0141A if the
interface was brought up with the cable plugged in but subsequently
unplugged, but 0x00C00400 if the interface was brought up with the cable
unplugged. I hope this helps.
Anthony J. Battersby
Cybernetics
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