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Date:   Tue, 3 Aug 2021 22:18:37 +0300
From:   Grygorii Strashko <grygorii.strashko@...com>
To:     Vladimir Oltean <vladimir.oltean@....com>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Jakub Kicinski <kuba@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Florian Fainelli <f.fainelli@...il.com>,
        Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Jiri Pirko <jiri@...nulli.us>,
        Ido Schimmel <idosch@...sch.org>,
        Roopa Prabhu <roopa@...dia.com>,
        Nikolay Aleksandrov <nikolay@...dia.com>,
        Stephen Hemminger <stephen@...workplumber.org>,
        "bridge@...ts.linux-foundation.org" 
        <bridge@...ts.linux-foundation.org>,
        Arnd Bergmann <arnd@...nel.org>
Subject: Re: [PATCH net-next 0/2] Convert switchdev_bridge_port_{,un}offload
 to notifiers



On 03/08/2021 21:15, Vladimir Oltean wrote:
> On Tue, Aug 03, 2021 at 08:11:56PM +0300, Grygorii Strashko wrote:
>> I've tested builds, but was not able to test bridge itself on TI am57x platform.
>>
>> 1) See warning
>> [    3.958496] ------------[ cut here ]------------
>> [    3.963165] WARNING: CPU: 0 PID: 1 at lib/refcount.c:25 fib_create_info+0xae8/0xbd4
>> [    3.970855] refcount_t: addition on 0; use-after-free.
>> [    3.976043] Modules linked in: autofs4
>> [    3.979827] CPU: 0 PID: 1 Comm: systemd Not tainted 5.14.0-rc4-next-20210802-00002-g5003e4ac441d-dirty #5
>> [    3.989440] Hardware name: Generic DRA72X (Flattened Device Tree)
>> [    3.995574] [<c0111098>] (unwind_backtrace) from [<c010b834>] (show_stack+0x10/0x14)
>> [    4.003356] [<c010b834>] (show_stack) from [<c09da808>] (dump_stack_lvl+0x40/0x4c)
>> [    4.010986] [<c09da808>] (dump_stack_lvl) from [<c0137b44>] (__warn+0xd8/0x100)
>> [    4.018341] [<c0137b44>] (__warn) from [<c09d6368>] (warn_slowpath_fmt+0x94/0xbc)
>> [    4.025848] [<c09d6368>] (warn_slowpath_fmt) from [<c08f68d4>] (fib_create_info+0xae8/0xbd4)
>> [    4.034332] [<c08f68d4>] (fib_create_info) from [<c08f99c4>] (fib_table_insert+0x5c/0x604¢·†AËÕìÍ_¡
>>
>> 2) see warnings and "ip link add name br0 type bridge" just stuck
>> [  158.032135] unregister_netdevice: waiting for lo to become free. Usage count = 3
>>
>> It might not be related to this series.
> 
> 100% not me.
> 
> See if you have David Ahern's bug fix, and if you do, try to see what
> other refcount conversion patches Yajun Deng did, revert them one by one
> and see if any one fixes the issue:
> https://patchwork.kernel.org/project/netdevbpf/patch/20210802160221.27263-1-dsahern@kernel.org/
> 

Yep. That's it.
build ok,
   CONFIG_TI_CPSW_SWITCHDEV=y
   CONFIG_BRIDGE=m

basic bridge with ping - ok.

Tested-by: Grygorii Strashko <grygorii.strashko@...com>

-- 
Best regards,
grygorii

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