Hello Wolfgang,
Hi Wolfgang,
On 12/11/2011 07:33 PM, Wolfgang Zarre wrote:
Hello Wolfgang,
On 12/07/2011 02:42 PM, Wolfgang Grandegger wrote:
Hi Wolfgang,
On 12/06/2011 10:08 PM, Wolfgang Zarre wrote:
...
Let me know if You need more or some other tests.
You could provoke some state changes or bus-off conditions to see if the
berr-counter shows reasonable results. I'm currently consolidating and
unifying error state and bus-off handling. Would be nice if you could do
some further tests when I have the patches ready...
I just pushed the mentioned modifications to the "devel" branch of my
"wg-linux-can-next" [1] repository. You can get it as shown below:
$ git clone --reference=<some-recent-net-next-tree> \
git://gitorious.org/~wgrandegger/linux-can/wg-linux-can-next.git
$ git checkout -b devel devel
[1] https://gitorious.org/~wgrandegger/linux-can/wg-linux-can-next
Wolfgang.
OK, I was trying so far and You will find below the results.
Just FYI the states on the PLC side couldn't be verified because the
function
provided by the manufacturer is not working at all and CAN analyser was not
available.
We are running CANopen and therefore the PLC will send automatically a
heartbeat.
I produced the bus-off state through a short circuit between L/H which was
working as expected.
A bit odd was that on the second try I had to reload the module
because a ip down/up was not enough.
Oops, not good.
But might be in connection with the strange behaviour of the PLC.
Let me know if You would need further tests or different procedure.
The state changes are reported via error messages, which you can list
with "candump -td -e any,0:0,#FFFFFFFF" with the attached patch.
Thanks, I'll try this with the next series of tests.
Producing L/H short circuit for 2 seconds
dmesg:
[ 885.409058] cc770_isa cc770_isa.0: can0: status interrupt (0x5b)
[ 885.420475] cc770_isa cc770_isa.0: can0: status interrupt (0xc5)
[ 885.420496] cc770_isa cc770_isa.0: can0: bus-off
ip -d -s link show can0
4: can0:<NO-CARRIER,NOARP,UP,ECHO> mtu 16 qdisc pfifo_fast state DOWN
qlen 10
link/can
can state BUS-OFF (berr-counter tx 92 rx 103) restart-ms 0
bitrate 500000 sample-point 0.875
tq 125 prop-seg 6 phase-seg1 7 phase-seg2 2 sjw 1
cc770: tseg1 1..16 tseg2 1..8 sjw 1..4 brp 1..64 brp-inc 1
clock 8000000
re-started bus-errors arbit-lost error-warn error-pass bus-off
0 0 0 1 0 1
RX: bytes packets errors dropped overrun mcast
544 382 0 0 0 0
TX: bytes packets errors dropped carrier collsns
30 29 0 0 0 0
Sending and receiving stops.
Trying to recover on PC:
ip link set can0 down;
ip -d -s link show can0
4: can0:<NOARP,ECHO> mtu 16 qdisc pfifo_fast state DOWN qlen 10
link/can
can state STOPPED (berr-counter tx 92 rx 103) restart-ms 0
bitrate 500000 sample-point 0.875
tq 125 prop-seg 6 phase-seg1 7 phase-seg2 2 sjw 1
cc770: tseg1 1..16 tseg2 1..8 sjw 1..4 brp 1..64 brp-inc 1
clock 8000000
re-started bus-errors arbit-lost error-warn error-pass bus-off
0 0 0 1 0 1
RX: bytes packets errors dropped overrun mcast
544 382 0 0 0 0
TX: bytes packets errors dropped carrier collsns
30 29 0 1 0 0
ip link set can0 up type can bitrate 500000;
dmesg:
[ 1090.937778] cc770_isa cc770_isa.0: can0: setting BTR0=0x00 BTR1=0x1c
[ 1090.937869] cc770_isa cc770_isa.0: can0: Message object 15 for RX
data, RTR, SFF and EFF
[ 1090.937885] cc770_isa cc770_isa.0: can0: Message object 11 for TX
data, RTR, SFF and EFF
[ 1090.938050] ADDRCONF(NETDEV_CHANGE): can0: link becomes ready
[ 1090.940769] cc770_isa cc770_isa.0: can0: status interrupt (0x5)
ip -d -s link show can0
4: can0:<NOARP,UP,LOWER_UP,ECHO> mtu 16 qdisc pfifo_fast state UP qlen 10
link/can
can state ERROR-ACTIVE (berr-counter tx 0 rx 0) restart-ms 0
bitrate 500000 sample-point 0.875
tq 125 prop-seg 6 phase-seg1 7 phase-seg2 2 sjw 1
cc770: tseg1 1..16 tseg2 1..8 sjw 1..4 brp 1..64 brp-inc 1
clock 8000000
re-started bus-errors arbit-lost error-warn error-pass bus-off
0 0 0 1 0 1
RX: bytes packets errors dropped overrun mcast
552 383 0 0 0 0
TX: bytes packets errors dropped carrier collsns
30 29 0 1 0 0
PLC in unknown state but not sending heartbeat,
Rebooting PLC
Hm, does it work if you do the bus-off recovery manually with?
# ip link set can0 up type can restart
... or automatically with?
# ip link set can0 up type can restart-ms 5000
Ah, ok, good point, will try out as well with the next series of tests
Anyway, rebooting/reloading should never be necessary. I will check on
my i82572.
-----------------------------------------
Disconnecting cable for around 4 seconds:
dmesg:
[ 2339.660283] cc770_isa cc770_isa.0: can0: status interrupt (0x5b)
ip -d -s link show can0
6: can0:<NOARP,UP,LOWER_UP,ECHO> mtu 16 qdisc pfifo_fast state UNKNOWN
qlen 10
link/can
can state ERROR-WARNING (berr-counter tx 128 rx 128) restart-ms 0
bitrate 500000 sample-point 0.875
tq 125 prop-seg 6 phase-seg1 7 phase-seg2 2 sjw 1
cc770: tseg1 1..16 tseg2 1..8 sjw 1..4 brp 1..64 brp-inc 1
clock 8000000
re-started bus-errors arbit-lost error-warn error-pass bus-off
0 0 0 1 0 0
RX: bytes packets errors dropped overrun mcast
459 298 0 0 0 0
TX: bytes packets errors dropped carrier collsns
193 192 0 0 0 0
TX and RX berr-counter are>= 128. I wonder why error passive was not
reached.
Hmmm, that is a good question and You are right > 127 should be error-passive,
anyway, just realised now, what means then 'error-warning' because I just
know error-active, error-passive and bus-off.
Connecting again:
ip -d -s link show can0
6: can0:<NOARP,UP,LOWER_UP,ECHO> mtu 16 qdisc pfifo_fast state UNKNOWN
qlen 10
link/can
can state ERROR-WARNING (berr-counter tx 120 rx 0) restart-ms 0
bitrate 500000 sample-point 0.875
tq 125 prop-seg 6 phase-seg1 7 phase-seg2 2 sjw 1
cc770: tseg1 1..16 tseg2 1..8 sjw 1..4 brp 1..64 brp-inc 1
clock 8000000
re-started bus-errors arbit-lost error-warn error-pass bus-off
0 0 0 1 0 0
RX: bytes packets errors dropped overrun mcast
473 311 0 0 0 0
TX: bytes packets errors dropped carrier collsns
200 200 0 0 0 0
After some time (around 125 seconds):
dmesg:
[ 2387.172008] cc770_isa cc770_isa.0: can0: status interrupt (0x18)
ip -d -s link show can0
6: can0:<NOARP,UP,LOWER_UP,ECHO> mtu 16 qdisc pfifo_fast state UNKNOWN
qlen 10
link/can
can state ERROR-ACTIVE (berr-counter tx 29 rx 0) restart-ms 0
bitrate 500000 sample-point 0.875
tq 125 prop-seg 6 phase-seg1 7 phase-seg2 2 sjw 1
cc770: tseg1 1..16 tseg2 1..8 sjw 1..4 brp 1..64 brp-inc 1
clock 8000000
re-started bus-errors arbit-lost error-warn error-pass bus-off
0 0 0 1 0 0
RX: bytes packets errors dropped overrun mcast
616 447 0 0 0 0
TX: bytes packets errors dropped carrier collsns
291 291 0 0 0 0
OK, the state is back to error active (counter< 96).
Thanks for testing...
You are welcome, however, I have to thank You for Your work done.
So, I'll try as soon as I can another series of tests and may be
You let me know if You have patches I should include as well.
Wolfgang.
Thanks
Wolfgang
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