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Date:   Fri, 7 Aug 2020 15:15:52 +0200
From:   Oleksij Rempel <o.rempel@...gutronix.de>
To:     Zhang Changzhong <zhangchangzhong@...wei.com>
Cc:     robin@...tonic.nl, linux@...pel-privat.de, kernel@...gutronix.de,
        socketcan@...tkopp.net, mkl@...gutronix.de, davem@...emloft.net,
        kuba@...nel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-can@...r.kernel.org
Subject: Re: [PATCH net 0/4] support multipacket broadcast message

On Fri, Aug 07, 2020 at 05:36:38PM +0800, Zhang Changzhong wrote:
> Hi Oleksij,
> 
> We have tested this j1939 stack according to SAE J1939-21. It works fine for
> most cases, but when we test multipacket broadcast message function we found
> the receiver can't receive those packets.
> 
> You can reproduce on CAN bus or vcan, for vcan case use cangw to connect vcan0
> and vcan1:
> sudo cangw -A -s vcan0 -d vcan1 -e
> sudo cangw -A -s vcan1 -d vcan0 -e
> 
> To reproduce it use following commands:
> testj1939 -B -r vcan1:0x90 &
> testj1939 -B -s20 vcan0:0x80 :,0x12300
> 
> Besides, candump receives correct packets while testj1939 receives nothing.

Ok, thank you!

i'm able to reproduce it and added following test:
https://github.com/linux-can/can-tests/blob/master/j1939/j1939_ac_1k_bam_local0.sh

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