Subject: Re: [PATCH net-next-2.6 v2] can: Topcliff: PCH_CAN driver: Add Flow control,

From: "Tomoya MORINAGA" <tomoya-linux-ECg8zkTtlr0C6LszWs/[email-masked]>
Date: Mon, 22 Nov 2010 14:20:19 +0900

On Friday, November 19, 2010 5:57 PM,  wrote :
> Could you please do the same testing while triggering a bus-off? After
> the test, the output of "ip -d -s link" would be interesting as well.

I show the result below.

[root@localhost can]# ip -d -s link
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    RX: bytes  packets  errors  dropped overrun mcast
    2280       40       0       0       0       0
    TX: bytes  packets  errors  dropped carrier collsns
    2280       40       0       0       0       0
2: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 00:40:26:c0:8a:31 brd ff:ff:ff:ff:ff:ff
    RX: bytes  packets  errors  dropped overrun mcast
    10119825   10809    0       0       0       664
    TX: bytes  packets  errors  dropped carrier collsns
    979543     6434     0       0       0       0
3: pan0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN
    link/ether de:02:85:50:76:f6 brd ff:ff:ff:ff:ff:ff
    RX: bytes  packets  errors  dropped overrun mcast
    0          0        0       0       0       0
    TX: bytes  packets  errors  dropped carrier collsns
    0          0        0       0       0       0
8: can0: <NOARP,UP,LOWER_UP,ECHO> mtu 16 qdisc pfifo_fast state UNKNOWN qlen 10
    link/can
    can state ERROR-PASSIVE restart-ms 0
    bitrate 125000 sample-point 0.875
    tq 500 prop-seg 6 phase-seg1 7 phase-seg2 2 sjw 1
    pch_can: tseg1 1..16 tseg2 1..8 sjw 1..4 brp 1..1024 brp-inc 1
    clock 50000000
    re-started bus-errors arbit-lost error-warn error-pass bus-off
    0          156295     0          156284     156280     0
    RX: bytes  packets  errors  dropped overrun mcast
    1250360    156295   156295  0       0       0
    TX: bytes  packets  errors  dropped carrier collsns
    0          0        0       0       0       0
[root@localhost can]#

------
Thanks,

Tomoya MORINAGA
OKI SEMICONDUCTOR CO., LTD.

----- Original Message ----- 
From: "Wolfgang Grandegger" <[email-masked]>
To: "Tomoya MORINAGA" <tomoya-linux-ECg8zkTtlr0C6LszWs/[email-masked]>
Cc: "David S. Miller" <davem-fT/PcQaiUtIeIZ0/[email-masked]>; "Wolfram Sang" <[email-masked]>; "Christian Pellegrin"
<[email-masked]>; "Barry Song" <[email-masked]>; "Samuel Ortiz" <sameo-VuQAYsv1563Yd54FQh9/[email-masked]>;
<[email-masked]>; <[email-masked]>; <[email-masked]>;
<[email-masked]>; <[email-masked]>; <[email-masked]>; <[email-masked]>; "Masayuki
Ohtake" <masa-korg-ECg8zkTtlr0C6LszWs/[email-masked]>; <[email-masked]>; <[email-masked]>
Sent: Friday, November 19, 2010 5:57 PM
Subject: Re: [PATCH net-next-2.6 v2] can: Topcliff: PCH_CAN driver: Add Flow control,

> Hi Tomoya,
>
> On 11/19/2010 08:36 AM, Tomoya MORINAGA wrote:
> > On Tuesday, November 16, 2010 7:16 PM, Wolfgang Grandegger wrote :
> >
> >>> ......It seems the same line continues forever.
> >>
> >> Yes, it will continue until you connect the cable, that's normal
> >> behavior. But that's not the full sequence. Could you please repeat the
> >> test as shown below:
> >>
> >>   First start the following command in a *separate* session.
> >>   # candump any,0:0,#FFFFFFFF"
> >>
> >>   Then setup and start the CAN controller:
> >>   # ip link set can0 up type can bitrate 125000
> >>   # cansend can0 123#deadbeef
> >>
> >
> > I show the result of the above command below,
> >
> > [root@localhost can-utils]# candump any,0:0,#FFFFFFFF
> >   can0  20000020  [8] 00 00 00 00 00 00 08 00   ERRORFRAME
> >   can0  20000020  [8] 00 00 00 00 00 00 10 00   ERRORFRAME
> >   can0  20000020  [8] 00 00 00 00 00 00 18 00   ERRORFRAME
> >   can0  20000020  [8] 00 00 00 00 00 00 20 00   ERRORFRAME
> >   can0  20000020  [8] 00 00 00 00 00 00 28 00   ERRORFRAME
> >   can0  20000020  [8] 00 00 00 00 00 00 30 00   ERRORFRAME
> >   can0  20000020  [8] 00 00 00 00 00 00 38 00   ERRORFRAME
> >   can0  20000020  [8] 00 00 00 00 00 00 40 00   ERRORFRAME
> >   can0  20000020  [8] 00 00 00 00 00 00 48 00   ERRORFRAME
> >   can0  20000020  [8] 00 00 00 00 00 00 50 00   ERRORFRAME
> >   can0  20000020  [8] 00 00 00 00 00 00 58 00   ERRORFRAME
>
> The above lines describe bus errors. Therefore it should be
>
>     can0  20000088  [8] 00 00 80 19 00 00 58 00   ERRORFRAME
>
> >   can0  20000024  [8] 00 00 00 00 00 00 60 00   ERRORFRAME
>
> The TX error counter has reached 96 signaling a can error state change
> to "error warning".
>
> >   can0  20000024  [8] 00 08 00 00 00 00 68 00   ERRORFRAME
>
> CAN_ERR_CRTL in the id and CAN_ERR_CRTL_TX_WARNING in data[1], but ...
>
> >   can0  20000024  [8] 00 08 00 00 00 00 70 00   ERRORFRAME
>
> the state change should be signaled only *once*.
>
> >   can0  20000024  [8] 00 08 00 00 00 00 78 00   ERRORFRAME
> >   can0  20000024  [8] 00 28 00 00 00 00 80 00   ERRORFRAME
>
> "Error passive" state is reached and CAN_ERR_CRTL_TX_PASSIVE sould be
> set in data[1], but CAN_ERR_CRTL_TX_WARNING should be removed.
>
> >   can0  20000024  [8] 00 28 00 00 00 00 80 00   ERRORFRAME
> >   can0  20000024  [8] 00 28 00 00 00 00 80 00   ERRORFRAME
> >   can0  20000024  [8] 00 28 00 00 00 00 80 00   ERRORFRAME
>
> Sounds magic, well, I'm going to prepare a patch as soon as your pending
> patch series is applied.
>
> Could you please do the same testing while triggering a bus-off? After
> the test, the output of "ip -d -s link" would be interesting as well.
>
> Thanks,
>
> Wolfgang.
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