> Stephen Hemminger wrote:
> > Same thing with KVM (kernel 2.6.28) and e1000, the driver thinks it is
> up
> > (per dmesg) but the carrier is not asserted.
>
> I believe what you are seeing on KVM and vmware are unrelated. In the
> case of vmware it looks like it keeps enabling the the carrier after the
> TX hangs, whereas in the case of KVM the carrier is off as per ethtool
> so you don't have it sending any traffic.
>
> In the KVM case you may want to check to verify the interface is
> actually up in ifconfig. The only way I could reproduce the ethtool and
> dmesg results you had seen in KVM was to bring up the interface and then
> bring it down via ifconfig. My reasoning on this is the link up message
> is always associated with netif_carrier_on, and only 3 spots call
> netif_carrier_off, and of those only e1000_down could do so without
> dumping some sort of message into the dmesg log and that would only be
> called if the interface was brought back down. I've seen something like
> this before as a result of Network Manager running in the background.
>
> As for the vmware issue I'm wondering if the emulation layer implemented
> the disconnect feature in the emulated e1000 layer correctly. What is
> the ethtool output after you have disconnected the emulated interface
> from the host? Also could you send us an ethtool -d register dump from
> the interface after the disconnect?
Below is the ethtool output after a disconnect:
r...@vdut:~# ethtool eth1
Settings for eth1:
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 auto-negotiation: Yes
Speed: 1000Mb/s
Duplex: Full
Port: Twisted Pair
PHYAD: 0
Transceiver: internal
Auto-negotiation: on
Supports Wake-on: d
Wake-on: d
Current message level: 0x00000007 (7)
Link detected: yes
r...@vdut:~# ethtool -i eth1
driver: e1000
version: 7.3.21-k3-NAPI
firmware-version: N/A
bus-info: 0000:00:11.0
r...@vdut:~# ethtool -d eth1
MAC Registers
-------------
0x00000: CTRL (Device control register) 0x00C00249
Endian mode (buffers): little
Link reset: reset
Set link up: 1
Invert Loss-Of-Signal: no
Receive flow control: disabled
Transmit flow control: disabled
VLAN mode: disabled
Auto speed detect: disabled
Speed select: 1000Mb/s
Force speed: no
Force duplex: no
0x00008: STATUS (Device status register) 0x0000CB83
Duplex: full
Link up: link config
TBI mode: disabled
Link speed: 1000Mb/s
Bus type: PCI
Bus speed: 66MHz
Bus width: 32-bit
0x00100: RCTL (Receive control register) 0x00048002
Receiver: enabled
Store bad packets: disabled
Unicast promiscuous: disabled
Multicast promiscuous: disabled
Long packet: disabled
Descriptor minimum threshold size: 1/2
Broadcast accept mode: accept
VLAN filter: enabled
Canonical form indicator: disabled
Discard pause frames: filtered
Pass MAC control frames: don't pass
Receive buffer size: 2048
0x02808: RDLEN (Receive desc length) 0x00001000
0x02810: RDH (Receive desc head) 0x0000006B
0x02818: RDT (Receive desc tail) 0x00000069
0x02820: RDTR (Receive delay timer) 0x00000000
0x00400: TCTL (Transmit ctrl register) 0x0103F0FA
Transmitter: enabled
Pad short packets: enabled
Software XOFF Transmission: disabled
Re-transmit on late collision: enabled
0x03808: TDLEN (Transmit desc length) 0x00001000
0x03810: TDH (Transmit desc head) 0x00000000
0x03818: TDT (Transmit desc tail) 0x00000000
0x03820: TIDV (Transmit delay timer) 0x00000008
PHY type: M88
After the interface is disconnected it gets a tx hang:
Mar 9 15:01:18 vyatta kernel: [ 493.002709] e1000: eth1:
e1000_clean_tx_irq: Detected Tx Unit Hang
Mar 9 15:01:18 vyatta kernel: [ 493.002716] Tx Queue <0>
Mar 9 15:01:18 vyatta kernel: [ 493.002718] TDH <0>
Mar 9 15:01:18 vyatta kernel: [ 493.002719] TDT <2>
Mar 9 15:01:18 vyatta kernel: [ 493.002720] next_to_use <2>
Mar 9 15:01:18 vyatta kernel: [ 493.002721] next_to_clean <0>
Mar 9 15:01:18 vyatta kernel: [ 493.002722] buffer_info[next_to_clean]
Mar 9 15:01:18 vyatta kernel: [ 493.002724] time_stamp
<bb75>
Mar 9 15:01:18 vyatta kernel: [ 493.002725] next_to_watch <0>
Mar 9 15:01:18 vyatta kernel: [ 493.002726] jiffies
<bc7a>
Mar 9 15:01:18 vyatta kernel: [ 493.002727] next_to_watch.status <0>
Mar 9 15:01:20 vyatta kernel: [ 495.002000] e1000: eth1:
e1000_clean_tx_irq: Detected Tx Unit Hang
Mar 9 15:01:20 vyatta kernel: [ 495.002004] Tx Queue <0>
Mar 9 15:01:20 vyatta kernel: [ 495.002005] TDH <0>
Mar 9 15:01:20 vyatta kernel: [ 495.002006] TDT <2>
Mar 9 15:01:20 vyatta kernel: [ 495.002007] next_to_use <2>
Mar 9 15:01:20 vyatta kernel: [ 495.002008] next_to_clean <0>
Mar 9 15:01:20 vyatta kernel: [ 495.002009] buffer_info[next_to_clean]
Mar 9 15:01:20 vyatta kernel: [ 495.002011] time_stamp
<bb75>
Mar 9 15:01:20 vyatta kernel: [ 495.002012] next_to_watch <0>
Mar 9 15:01:20 vyatta kernel: [ 495.002013] jiffies
<be6e>
Mar 9 15:01:20 vyatta kernel: [ 495.002014] next_to_watch.status <0>
Mar 9 15:01:22 vyatta kernel: [ 497.002315] e1000: eth1:
e1000_clean_tx_irq: Detected Tx Unit Hang
Mar 9 15:01:22 vyatta kernel: [ 497.002318] Tx Queue <0>
Mar 9 15:01:22 vyatta kernel: [ 497.002320] TDH <0>
Mar 9 15:01:22 vyatta kernel: [ 497.002321] TDT <2>
Mar 9 15:01:22 vyatta kernel: [ 497.002322] next_to_use <2>
Mar 9 15:01:22 vyatta kernel: [ 497.002323] next_to_clean <0>
Mar 9 15:01:22 vyatta kernel: [ 497.002325] buffer_info[next_to_clean]
Mar 9 15:01:22 vyatta kernel: [ 497.002326] time_stamp
<bb75>
Mar 9 15:01:22 vyatta kernel: [ 497.002327] next_to_watch <0>
Mar 9 15:01:22 vyatta kernel: [ 497.002328] jiffies
<c062>
Mar 9 15:01:22 vyatta kernel: [ 497.002329] next_to_watch.status <0>
Mar 9 15:01:23 vyatta kernel: [ 498.001260] ------------[ cut here
]------------
Mar 9 15:01:23 vyatta kernel: [ 498.001283] WARNING: at
net/sched/sch_generic.c:226 dev_watchdog+0xca/0x11b()
Mar 9 15:01:23 vyatta kernel: [ 498.001329] Modules linked in:
ipt_REJECT ipt_LOG xt_multiport xt_tcpudp xt_comment ip6table_raw
ip6table_mangle ip6table_filter ip6_tables iptable_mangle iptable_nat
iptable_filter xt_NOTRACK iptable_raw ip_tables x_tables nf_nat_pptp
nf_conntrack_pptp nf_conntrack_proto_gre nf_nat_h323 nf_conntrack_h323
nf_nat_sip nf_conntrack_sip nf_nat_proto_gre nf_nat_tftp nf_nat_ftp nf_nat
nf_conntrack_ipv4 nf_defrag_ipv4 nf_conntrack_tftp nf_conntrack_ftp
nf_conntrack ipv6 md_mod psmouse serio_raw vmxnet pcspkr parport_pc
parport i2c_piix4 i2c_core container ac button shpchp intel_agp
pci_hotplug agpgart evdev vfat fat ext2 mbcache battery squashfs loop
unionfs nls_utf8 isofs nls_base zlib_inflate ide_generic ide_gd_mod
ide_cd_mod cdrom ata_generic ata_piix libata floppy mptspi mptscsih
mptbase scsi_transport_spi scsi_mod e1000 piix ide_pci_generic ide_core
thermal processor fan thermal_sys
Mar 9 15:01:23 vyatta kernel: [ 498.001638] Pid: 0, comm: swapper
Tainted: G W 2.6.28-1-586-vyatta #1
Mar 9 15:01:23 vyatta kernel: [ 498.001642] Call Trace:
Mar 9 15:01:23 vyatta kernel: [ 498.001665] [<c0123393>]
warn_slowpath+0x61/0x78
Mar 9 15:01:23 vyatta kernel: [ 498.001673] [<c0104b00>]
invalidate_interrupt+0x20/0x30
Mar 9 15:01:23 vyatta kernel: [ 498.001679] [<c0108b01>]
nommu_map_single+0x2b/0x42
Mar 9 15:01:23 vyatta kernel: [ 498.002158] [<f81385d8>]
pci_map_single+0x2b/0x30 [e1000]
Mar 9 15:01:23 vyatta kernel: [ 498.002176] [<f813a7bf>]
e1000_alloc_rx_buffers+0x155/0x223 [e1000]
Mar 9 15:01:23 vyatta kernel: [ 498.002193] [<f813c493>]
e1000_clean_rx_irq+0x3ec/0x41d [e1000]
Mar 9 15:01:23 vyatta kernel: [ 498.002204] [<c01e1f1e>]
strlcpy+0x14/0x3e
Mar 9 15:01:23 vyatta kernel: [ 498.002209] [<c026ca25>]
dev_watchdog+0xca/0x11b
Mar 9 15:01:23 vyatta kernel: [ 498.002218] [<c0133951>]
run_posix_cpu_timers+0x86/0x5ae
Mar 9 15:01:23 vyatta kernel: [ 498.002223] [<c0108bc2>]
get_cycles+0xf/0x1d
Mar 9 15:01:23 vyatta kernel: [ 498.002227] [<c0108bd6>]
read_tsc+0x6/0x22
Mar 9 15:01:23 vyatta kernel: [ 498.002231] [<c01370f5>]
clocksource_read+0x5/0x6
Mar 9 15:01:23 vyatta kernel: [ 498.002236] [<c0110815>]
lapic_next_event+0x10/0x13
Mar 9 15:01:23 vyatta kernel: [ 498.002241] [<c0139bed>]
clockevents_program_event+0xd1/0xe0
Mar 9 15:01:23 vyatta kernel: [ 498.002246] [<c026c95b>]
dev_watchdog+0x0/0x11b
Mar 9 15:01:23 vyatta kernel: [ 498.002250] [<c026c95b>]
dev_watchdog+0x0/0x11b
Mar 9 15:01:23 vyatta kernel: [ 498.002255] [<c012a282>]
run_timer_softirq+0x10e/0x167
Mar 9 15:01:23 vyatta kernel: [ 498.002259] [<c026c95b>]
dev_watchdog+0x0/0x11b
Mar 9 15:01:23 vyatta kernel: [ 498.002264] [<c01270be>]
__do_softirq+0x7e/0xfe
Mar 9 15:01:23 vyatta kernel: [ 498.002269] [<c0127170>]
do_softirq+0x32/0x36
Mar 9 15:01:23 vyatta kernel: [ 498.002273] [<c01273c2>]
irq_exit+0x38/0x76
Mar 9 15:01:23 vyatta kernel: [ 498.002278] [<c0110f9e>]
smp_apic_timer_interrupt+0x63/0x6d
Mar 9 15:01:23 vyatta kernel: [ 498.002282] [<c0104bc8>]
apic_timer_interrupt+0x28/0x30
Mar 9 15:01:23 vyatta kernel: [ 498.002287] [<c01097c9>]
default_idle+0x2d/0x40
Mar 9 15:01:23 vyatta kernel: [ 498.002290] [<c01028b9>]
cpu_idle+0x68/0x89
Mar 9 15:01:23 vyatta kernel: [ 498.002328] ---[ end trace
4eaa2a86a8e2da22 ]---
Mar 9 15:01:23 vyatta vyatta-zebra[2000]: interface eth1 index 2 changed
<UP,BROADCAST,MULTICAST>.
stig
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