netdev - Re: [PATCH net-next 0/7] net/smc: implement SMCv2.1 virtual ISM device support

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Date: Fri, 24 Nov 2023 14:11:33 +0100
From: Wenjia Zhang <wenjia@...ux.ibm.com>
To: Wen Gu <guwen@...ux.alibaba.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,
        kgraul@...ux.ibm.com, jaka@...ux.ibm.com
Cc: borntraeger@...ux.ibm.com, svens@...ux.ibm.com, alibuda@...ux.alibaba.com,
        tonylu@...ux.alibaba.com, raspl@...ux.ibm.com, schnelle@...ux.ibm.com,
        linux-s390@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next 0/7] net/smc: implement SMCv2.1 virtual ISM
 device support



On 19.11.23 14:57, Wen Gu wrote:
> The fourth edition of SMCv2 adds the SMC version 2.1 feature updates for
> SMC-Dv2 with virtual ISM. Virtual ISM are created and supported mainly by
> OS or hypervisor software, comparable to IBM ISM which is based on platform
> firmware or hardware.
> 
> With the introduction of virtual ISM, SMCv2.1 makes some updates:
> 
> - Introduce feature bitmask to indicate supplemental features.
> - Reserve a range of CHIDs for virtual ISM.
> - Support extended GIDs (128 bits) in CLC handshake.
> 
> So this patch set aims to implement these updates in Linux kernel. And it
> acts as the first part of the new version of [1].
> 
> [1] https://lore.kernel.org/netdev/1695568613-125057-1-git-send-email-guwen@linux.alibaba.com/
> 
> Wen Gu (7):
>    net/smc: Rename some variable 'fce' to 'fce_v2x' for clarity
>    net/smc: support SMCv2.x supplemental features negotiation
>    net/smc: introduce virtual ISM device support feature
>    net/smc: define a reserved CHID range for virtual ISM devices
>    net/smc: compatible with 128-bits extend GID of virtual ISM device
>    net/smc: disable SEID on non-s390 archs where virtual ISM may be used
>    net/smc: manage system EID in SMC stack instead of ISM driver
> 
>   drivers/s390/net/ism.h     |  6 ---
>   drivers/s390/net/ism_drv.c | 54 +++++++--------------------
>   include/linux/ism.h        |  1 -
>   include/net/smc.h          | 16 +++++---
>   net/smc/af_smc.c           | 68 ++++++++++++++++++++++++++-------
>   net/smc/smc.h              |  7 ++++
>   net/smc/smc_clc.c          | 93 ++++++++++++++++++++++++++++++++--------------
>   net/smc/smc_clc.h          | 22 +++++++----
>   net/smc/smc_core.c         | 30 ++++++++++-----
>   net/smc/smc_core.h         |  8 ++--
>   net/smc/smc_diag.c         |  7 +++-
>   net/smc/smc_ism.c          | 57 ++++++++++++++++++++--------
>   net/smc/smc_ism.h          | 31 +++++++++++++++-
>   net/smc/smc_pnet.c         |  4 +-
>   14 files changed, 269 insertions(+), 135 deletions(-)
> 

Hi Wen Gu,

Just FYI, the review is still on going and some tests on our plateform 
still need to do. I'll give you my comments as soon as the testing is 
done. I think it would be at the beginning of next week.

Thanks,
Wenjia