[OpenWrt-Devel] [PATCH 2/5] lantiq/xrx200-net: fix PCE_MAPx handling

John Crispin blogic at openwrt.org
Tue Feb 23 02:40:42 EST 2016

On 22/02/2016 19:05, Felix Fietkau wrote:
> On 2016-02-22 13:17, Martin Schiller wrote:
>> On 02/20/2016 at 10:59 AM, Felix Fietkau wrote:
>>> On 2016-02-18 14:13, Martin Schiller wrote:
>>>> Remove unnecessary MPMAP (PCE_MAP1) initialization and make
>>>> and UUCMAP (PCE_MAP3) configurable from user space.
>>>> Signed-off-by: Martin Schiller <mschiller at tdt.de>
>>> This looks a lot like a low level implementation detail that should not
>>> be exposed to the configuration. Please provide an explanation of how
>>> exactly these port map registers works, so we can figure out a way to
>>> set it dynamically from within the driver.
>>> - Felix
>> MPMAP is the map of ports to which incoming frames shall be sent for
>> monitoring.
>> There are a lot of other registers where you can configure which kind of
>> frames shall be monitored. So adding ports to the MPMAP without further
>> configuration doesn't make sense, and so the MPMAP initialization should
>> be removed.
>> DMCPMAP is the map of ports to which incoming unknown multicast and
>> broadcast frames shall be sent.
>> UUCMAP ist he map of ports to which incoming unknown unicast frames
>> shall be sent.
>>  I introduced this configure options, because they were helpful to figure
>> out the behaivor of this mappings while I was "fighting" with the LAN/WAN port
>> separation, but there is actually no really strong need to have access to this
>> registers from userspace.
>> So my thought was that it won't hurt or break anything else when I add the
>> opportunity to change this register values from userspace.
> I don't like this kind of random debug stuff in swconfig. How about you
> add a plain debugfs interface instead that can read/write any register.
> - Felix

i agree. i will mark the series as "changes requested". i wish we could
just have a quick phone call to see how to best fix this in the kernel
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