netdev - Re: [RFC net-next 0/7] Provide an ism layer

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Message-ID: <80330f0e-d769-4251-be2f-a2b5adb12ef2@linux.ibm.com>
Date: Fri, 17 Jan 2025 14:00:55 +0100
From: Alexandra Winter <wintera@...ux.ibm.com>
To: dust.li@...ux.alibaba.com, Julian Ruess <julianr@...ux.ibm.com>,
        Wenjia Zhang <wenjia@...ux.ibm.com>, Jan Karcher <jaka@...ux.ibm.com>,
        Gerd Bayer <gbayer@...ux.ibm.com>, Halil Pasic <pasic@...ux.ibm.com>,
        "D. Wythe" <alibuda@...ux.alibaba.com>,
        Tony Lu <tonylu@...ux.alibaba.com>, Wen Gu <guwen@...ux.alibaba.com>,
        Peter Oberparleiter
 <oberpar@...ux.ibm.com>,
        David Miller <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, Eric Dumazet <edumazet@...gle.com>,
        Andrew Lunn <andrew+netdev@...n.ch>
Cc: Niklas Schnelle <schnelle@...ux.ibm.com>,
        Thorsten Winkler <twinkler@...ux.ibm.com>, netdev@...r.kernel.org,
        linux-s390@...r.kernel.org, Heiko Carstens <hca@...ux.ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Alexander Gordeev
 <agordeev@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ux.ibm.com>,
        Sven Schnelle <svens@...ux.ibm.com>, Simon Horman <horms@...nel.org>
Subject: Re: [RFC net-next 0/7] Provide an ism layer



On 17.01.25 03:13, Dust Li wrote:
>>>> Modular Approach: I've made the ism_loopback an independent kernel
>>>> module since dynamic enable/disable functionality is not yet supported
>>>> in SMC. Using insmod and rmmod for module management could provide the
>>>> flexibility needed in practical scenarios.
>>
>> With this proposal ism_loopback is just another ism device and SMC-D will
>> handle removal just like ism_client.remove(ism_dev) of other ism devices.
>>
>> But I understand that net/smc/ism_loopback.c today does not provide enable/disable,
>> which is a big disadvantage, I agree. The ism layer is prepared for dynamic
>> removal by ism_dev_unregister(). In case of this RFC that would only happen
>> in case of rmmod ism. Which should be improved.
>> One way to do that would be a separate ism_loopback kernel module, like you say.
>> Today ism_loopback is only 10k LOC, so I'd be fine with leaving it in the ism module.
>> I also think it is a great way for testing any ISM client, so it has benefit for
>> anybody using the ism module.
>> Another way would be e.g. an 'enable' entry in the sysfs of the loopback device.
>> (Once we agree if and how to represent ism devices in genera in sysfs).
> This works for me as well. I think it would be better to implement this
> within the common ISM layer, rather than duplicating the code in each
> device. Similar to how it's done in netdevice.
> 
> Best regards,
> Dust


Is there a specific example for enable/disable in the netdevice code, you have in mind?
Or do you mean in general how netdevice provides a common layer?
Yes, everything that is common for all devices should be provided by the network layer.