Re: [PATCH v5 2/5] can: kvaser_usb: Consolidate and unify state change handling
From: Andri Yngvason <hidden>
Date: 2015-01-21 15:00:42
Also in:
linux-can, lkml
Quoting Ahmed S. Darwish (2015-01-21 14:43:23)
Hi! On Wed, Jan 21, 2015 at 12:53:58PM +0100, Wolfgang Grandegger wrote:quoted
On Wed, 21 Jan 2015 10:33:19 +0000, Andri Yngvason [off-list ref] wrote:quoted
Quoting Ahmed S. Darwish (2015-01-20 21:45:37)quoted
From: Ahmed S. Darwish <redacted> Replace most of the can interface's state and error counters handling with the new can-dev can_change_state() mechanism. Suggested-by: Andri Yngvason <redacted> Signed-off-by: Ahmed S. Darwish <redacted> --- drivers/net/can/usb/kvaser_usb.c | 114 +++++++++++++++++++-------------------- 1 file changed, 55 insertions(+), 59 deletions(-)diff --git a/drivers/net/can/usb/kvaser_usb.cb/drivers/net/can/usb/kvaser_usb.c index 971c5f9..0386d3f 100644--- a/drivers/net/can/usb/kvaser_usb.c +++ b/drivers/net/can/usb/kvaser_usb.c...quoted
Looks good.Would be nice to see some "candump" traces as well.Sure. The USBCan-II device trace below is generated after applying all patches in the series, especially patch #3, which fixes some some invalid CAN state transitions logic in the original driver.
[...]
Afterwards, candump on a PC, Kvaser USB device on the sending end:
...
(000.008784) can0 60A [1] C1
(000.011341) can0 2A8 [8] C2 0A 00 00 00 00 00 00
(000.009873) can0 03D [7] C3 0A 00 00 00 00 00
(000.010394) can0 55C [8] C4 0A 00 00 00 00 00 00
(000.009979) can0 45A [8] C5 0A 00 00 00 00 00 00
(000.010125) can0 6E8 [8] C6 0A 00 00 00 00 00 00
(000.010149) can0 4EE [8] C7 0A 00 00 00 00 00 00
(000.010102) can0 5D2 [8] C8 0A 00 00 00 00 00 00
(000.010000) can0 61F [8] C9 0A 00 00 00 00 00 00
(000.010271) can0 5F8 [8] CA 0A 00 00 00 00 00 00
<-- Unplug the cable -->
(000.009106) can0 20000080 [8] 00 00 00 00 00 00 08 00 ERRORFRAME
bus-error
error-counter-tx-rx{{8}{0}}
(000.001872) can0 20000080 [8] 00 00 00 00 00 00 10 00 ERRORFRAME
bus-error
error-counter-tx-rx{{16}{0}}[...]
error-counter-tx-rx{{80}{0}}
(000.001910) can0 20000080 [8] 00 00 00 00 00 00 58 00 ERRORFRAME
bus-error
error-counter-tx-rx{{88}{0}}
(000.001753) can0 20000084 [8] 00 08 00 00 00 00 60 00 ERRORFRAME
controller-problem{tx-error-warning}Good.
bus-error
error-counter-tx-rx{{96}{0}}
(000.001720) can0 20000080 [8] 00 00 00 00 00 00 68 00 ERRORFRAME
bus-error
error-counter-tx-rx{{104}{0}}
(000.001876) can0 20000080 [8] 00 00 00 00 00 00 70 00 ERRORFRAME
bus-error
error-counter-tx-rx{{112}{0}}
(000.001749) can0 20000080 [8] 00 00 00 00 00 00 78 00 ERRORFRAME
bus-error
error-counter-tx-rx{{120}{0}}
(000.001771) can0 20000084 [8] 00 20 00 00 00 00 80 00 ERRORFRAME
controller-problem{tx-error-passive}Also good.
bus-error
error-counter-tx-rx{{128}{0}}
(000.001868) can0 20000080 [8] 00 00 00 00 00 00 80 00 ERRORFRAME
bus-error
error-counter-tx-rx{{128}{0}}
(000.001982) can0 20000080 [8] 00 00 00 00 00 00 80 00 ERRORFRAME
bus-error
error-counter-tx-rx{{128}{0}}
(( Then a continous flood, exactly similar to the above packet, appears.
Unfortunately this flooding is a firmware problem. ))
<-- Replug the cable, after a good amount of time -->Where are the reverse state transitions?
(000.520485) can0 33D [4] CB 0A 00 00
(000.002693) can0 42E [8] CC 0A 00 00 00 00 00 00
(000.001795) can0 319 [4] CD 0A 00 00
(000.002705) can0 3B1 [8] CE 0A 00 00 00 00 00 00
(000.001295) can0 4CC [2] CF 0A
(000.002205) can0 42B [6] D0 0A 00 00 00 00
(000.001620) can0 5A2 [3] D1 0A 00
(000.002636) can0 691 [8] D2 0A 00 00 00 00 00 00
(000.002615) can0 36A [8] D3 0A 00 00 00 00 00 00
(000.001729) can0 068 [4] D4 0A 00 00
(000.001195) can0 4C8 [1] D5
...
##########################################################################
Bus-off Testing:
candump on a PC, Kvaser device on the sending end. An i.mx6 ARM
board with flexcan is on the receiving end:
(000.010319) can0 5CC [8] 90 02 00 00 00 00 00 00
(000.008747) can0 679 [1] 91
(000.011442) can0 011 [8] 92 02 00 00 00 00 00 00
(000.008991) can0 631 [2] 93 02
(000.011097) can0 532 [7] 94 02 00 00 00 00 00
(000.009781) can0 0A9 [5] 95 02 00 00 00
(000.010792) can0 1DD [8] 96 02 00 00 00 00 00 00
(000.010026) can0 44E [8] 97 02 00 00 00 00 00 00
(000.010181) can0 76A [8] 98 02 00 00 00 00 00 00
(000.008867) can0 1A5 [1] 99
(000.011322) can0 2B4 [8] 9A 02 00 00 00 00 00 00
<-- Unplug the can low and high wires from the board -->
(000.009688) can0 20000080 [8] 00 00 00 00 00 00 08 00 ERRORFRAME
bus-error
error-counter-tx-rx{{8}{0}}
(000.002246) can0 20000080 [8] 00 00 00 00 00 00 10 00 ERRORFRAME
bus-error
error-counter-tx-rx{{16}{0}}
(000.002124) can0 20000080 [8] 00 00 00 00 00 00 18 00 ERRORFRAME
bus-error
error-counter-tx-rx{{24}{0}}
(000.002115) can0 20000080 [8] 00 00 00 00 00 00 20 00 ERRORFRAME
bus-error
error-counter-tx-rx{{32}{0}}
(000.002132) can0 20000080 [8] 00 00 00 00 00 00 28 00 ERRORFRAME
bus-error
error-counter-tx-rx{{40}{0}}
(000.002266) can0 20000080 [8] 00 00 00 00 00 00 30 00 ERRORFRAME
bus-error
error-counter-tx-rx{{48}{0}}
(000.002187) can0 20000080 [8] 00 00 00 00 00 00 38 00 ERRORFRAME
bus-error
error-counter-tx-rx{{56}{0}}
(000.002046) can0 20000080 [8] 00 00 00 00 00 00 40 00 ERRORFRAME
bus-error
error-counter-tx-rx{{64}{0}}
(000.002076) can0 20000080 [8] 00 00 00 00 00 00 48 00 ERRORFRAME
bus-error
error-counter-tx-rx{{72}{0}}
(000.002406) can0 20000080 [8] 00 00 00 00 00 00 50 00 ERRORFRAME
bus-error
error-counter-tx-rx{{80}{0}}
(000.001969) can0 20000080 [8] 00 00 00 00 00 00 58 00 ERRORFRAME
bus-error
error-counter-tx-rx{{88}{0}}
(000.002388) can0 20000084 [8] 00 08 00 00 00 00 60 00 ERRORFRAME
controller-problem{tx-error-warning}
bus-error
error-counter-tx-rx{{96}{0}}
(000.002021) can0 20000080 [8] 00 00 00 00 00 00 68 00 ERRORFRAME
bus-error
error-counter-tx-rx{{104}{0}}
(000.002110) can0 20000080 [8] 00 00 00 00 00 00 70 00 ERRORFRAME
bus-error
error-counter-tx-rx{{112}{0}}
(000.002155) can0 20000080 [8] 00 00 00 00 00 00 78 00 ERRORFRAME
bus-error
error-counter-tx-rx{{120}{0}}
(000.002140) can0 20000084 [8] 00 20 00 00 00 00 80 00 ERRORFRAME
controller-problem{tx-error-passive}
bus-error
error-counter-tx-rx{{128}{0}}
(000.002324) can0 20000080 [8] 00 00 00 00 00 00 80 00 ERRORFRAME
bus-error
error-counter-tx-rx{{128}{0}}
(000.002416) can0 20000080 [8] 00 00 00 00 00 00 80 00 ERRORFRAME
bus-error
error-counter-tx-rx{{128}{0}}
(000.002237) can0 20000080 [8] 00 00 00 00 00 00 80 00 ERRORFRAME
bus-error
error-counter-tx-rx{{128}{0}}
(( Then a continous flood, exactly similar to the above packet, appears ))
<-- Short-circuit the can high and low wires -->
(000.002364) can0 20000080 [8] 00 00 00 00 00 00 80 00 ERRORFRAME
bus-error
error-counter-tx-rx{{128}{0}}
(000.002108) can0 20000080 [8] 00 00 00 00 00 00 88 00 ERRORFRAME
bus-error
error-counter-tx-rx{{136}{0}}
(000.000494) can0 20000080 [8] 00 00 00 00 00 00 90 00 ERRORFRAME
bus-error
error-counter-tx-rx{{144}{0}}
(000.000523) can0 20000080 [8] 00 00 00 00 00 00 98 00 ERRORFRAME
bus-error
error-counter-tx-rx{{152}{0}}
(000.000661) can0 20000080 [8] 00 00 00 00 00 00 A0 00 ERRORFRAME
bus-error
error-counter-tx-rx{{160}{0}}
(000.000464) can0 20000080 [8] 00 00 00 00 00 00 A8 00 ERRORFRAME
bus-error
error-counter-tx-rx{{168}{0}}
(000.000534) can0 20000080 [8] 00 00 00 00 00 00 B0 00 ERRORFRAME
bus-error
error-counter-tx-rx{{176}{0}}
(000.000499) can0 20000080 [8] 00 00 00 00 00 00 B8 00 ERRORFRAME
bus-error
error-counter-tx-rx{{184}{0}}
(000.000626) can0 20000080 [8] 00 00 00 00 00 00 C0 00 ERRORFRAME
bus-error
error-counter-tx-rx{{192}{0}}
(000.000373) can0 20000080 [8] 00 00 00 00 00 00 C8 00 ERRORFRAME
bus-error
error-counter-tx-rx{{200}{0}}
(000.000627) can0 20000080 [8] 00 00 00 00 00 00 D0 00 ERRORFRAME
bus-error
error-counter-tx-rx{{208}{0}}
(000.000507) can0 20000080 [8] 00 00 00 00 00 00 D8 00 ERRORFRAME
bus-error
error-counter-tx-rx{{216}{0}}
(000.000501) can0 20000080 [8] 00 00 00 00 00 00 E0 00 ERRORFRAME
bus-error
error-counter-tx-rx{{224}{0}}
(000.000459) can0 20000080 [8] 00 00 00 00 00 00 E8 00 ERRORFRAME
bus-error
error-counter-tx-rx{{232}{0}}
(000.000606) can0 20000080 [8] 00 00 00 00 00 00 F0 00 ERRORFRAME
bus-error
error-counter-tx-rx{{240}{0}}
(000.000454) can0 20000080 [8] 00 00 00 00 00 00 F8 00 ERRORFRAME
bus-error
error-counter-tx-rx{{248}{0}}
(000.000664) can0 200000C0 [8] 00 00 00 00 00 00 00 00 ERRORFRAME
bus-off
bus-error
(( No further bus activity ))Bus-off seems OK. You could have just short circuited them without disconnecting. Reverse state transitions are missing from the logs. See comments above. -- Andri