linux-kernel - Re: [PATCH net-next 09/15] net/smc: introduce loopback-ism statistics attributes

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Date: Tue, 20 Feb 2024 10:45:19 +0800
From: Wen Gu <guwen@...ux.alibaba.com>
To: Wenjia Zhang <wenjia@...ux.ibm.com>, wintera@...ux.ibm.com,
 hca@...ux.ibm.com, gor@...ux.ibm.com, agordeev@...ux.ibm.com,
 davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
 pabeni@...hat.com, jaka@...ux.ibm.com
Cc: borntraeger@...ux.ibm.com, svens@...ux.ibm.com,
 alibuda@...ux.alibaba.com, tonylu@...ux.alibaba.com,
 linux-s390@...r.kernel.org, netdev@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next 09/15] net/smc: introduce loopback-ism statistics
 attributes

On 2024/2/16 22:24, Wenjia Zhang wrote:
> 
> 
> On 11.01.24 13:00, Wen Gu wrote:
>> This introduces some statistics attributes of loopback-ism. They can be
>> read from /sys/devices/virtual/smc/loopback-ism/{xfer_tytes|dmbs_cnt}.
>>
>> Signed-off-by: Wen Gu <guwen@...ux.alibaba.com>
>> ---
>>   net/smc/smc_loopback.c | 74 ++++++++++++++++++++++++++++++++++++++++++
>>   net/smc/smc_loopback.h | 22 +++++++++++++
>>   2 files changed, 96 insertions(+)
>>
> 
> I've read the comments from Jiri and your answer. I can understand your thought. However, from the perspective of the 
> end user, it makes more sense to integetrate the stats info into 'smcd stats'. Otherwise, it would make users confused 
> to find out with which tool to check which statisic infornation. Sure, some improvement of the smc-tools is also needed

Thank you Wenjia.

Let's draw an analogy with RDMA devices, which is used in SMC-R. If we want
to check the RNIC status or statistics, we may use rdma statistic command, or
ibv_devinfo command, or check file under /sys/class/infiniband/mlx5_0. These
provide details or attributes related to *devices*.

Since s390 ISM can be used out of SMC, I guess it also has its own way (other
than smc-tools) to check the statistic?

What we can see in smcr stats or smcd stats command is about statistic or
status of SMC *protocol* layer, such as DMB status, Tx/Rx, connections, fallbacks.

If we put the underlying devices's statistics into smc-tools, should we also
put RNIC statistics or s390 ISM statistics into smcr stat or smcd stat? and
for each futures device that can be used by SMC-R/SMC-D, should we update them
into smcr stat and smcd stat? And the attributes of each devices may be different,
should we add entries in smcd stat for each of them?

After considering the above things, I believe that the details of the underlying
device should not be exposed to smc(smc-tools). What do you think?

Thanks!