[virtio-comment] Re: [virtio-dev] Re: [virtio-comment] [PATCH v3 1/1] virtio-ism: introduce new device virtio-ism

From: Alexandra Winter <wintera@linux.ibm.com>
To: Wen Gu <guwen@linux.alibaba.com>,
	Halil Pasic <pasic@linux.ibm.com>,
	Xuan Zhuo <xuanzhuo@linux.alibaba.com>
Cc: virtio-comment@lists.oasis-open.org, hans@linux.alibaba.com,
	herongguang@linux.alibaba.com, zmlcc@linux.alibaba.com,
	dust.li@linux.alibaba.com, tonylu@linux.alibaba.com,
	zhenzao@linux.alibaba.com, helinguo@linux.alibaba.com,
	gerry@linux.alibaba.com, mst@redhat.com, cohuck@redhat.com,
	jasowang@redhat.com, Jan Kiszka <jan.kiszka@siemens.com>,
	kgraul@linux.ibm.com, wenjia@linux.ibm.com, jaka@linux.ibm.com,
	hca@linux.ibm.com, twinkler@linux.ibm.com, raspl@linux.ibm.com,
	virtio-dev@lists.oasis-open.org
Subject: [virtio-comment] Re: [virtio-dev] Re: [virtio-comment] [PATCH v3 1/1] virtio-ism: introduce new device virtio-ism
Date: Wed, 5 Apr 2023 14:39:53 +0200	[thread overview]
Message-ID: <7a9ebec0-5e87-b80f-4f2c-c4db7ae4fe84@linux.ibm.com> (raw)
In-Reply-To: <ff9b28a1-e0ee-f082-1f40-f3e149c9403e@linux.alibaba.com>

On 24.03.23 05:03, Wen Gu wrote:
> 
> 
> On 2023/3/23 22:46, Halil Pasic wrote:
> 
>> On Thu,  9 Feb 2023 11:30:56 +0800
>> Xuan Zhuo <xuanzhuo@linux.alibaba.com> wrote:
>>

...

> 
>> To get back to the things proposed here: the cdid is IMHO
>> a nice thing, and is functionally corresponding to the
>> (S)EID. But it is 16 byte wide, and I have no idea how
>> is it supposed to be used in the CLC handshake.
>>
> 
> CLC handshake carry one SEID for all the SMC-D device. Considering
> coexistence with ISM, I am not sure whether we can change or increase
> the SEID.. cc Alexandra
> 
> Thanks!
> Wen Gu

As mentioned by others, discussions are ongoing.
It would be great, if we can agree on a way to use the existing CLC handshake
for SMC-D via virtio-ism and ism-loopback.
In that case SEID needs to be unique per hardware instance, cannot be increased and
can only be changed for x86 in a non-colliding way.

An alternative would be to define new a SMC-D(?) protocol variant/version, where we
are free to define new fields (e.g. UUIDs).

Alexandra

> 
>> If this is really supposed to work with SMC and not just take
>> inspiration from it, I would like some insight from our
>> SMC experts (they are already on copy).
>>
>> Regards,
>> Halil
>>
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