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Mon, 4 Dec 2023 12:58:01 GMT Received: from smtpav02.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 3D8352004E; Mon, 4 Dec 2023 12:58:01 +0000 (GMT) Received: from smtpav02.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 1C53B20040; Mon, 4 Dec 2023 12:58:00 +0000 (GMT) Received: from [9.179.21.199] (unknown [9.179.21.199]) by smtpav02.fra02v.mail.ibm.com (Postfix) with ESMTP; Mon, 4 Dec 2023 12:58:00 +0000 (GMT) Message-ID: Date: Mon, 4 Dec 2023 13:57:59 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH net-next v3 7/7] net/smc: manage system EID in SMC stack instead of ISM driver Content-Language: en-US To: Wen Gu , wenjia@linux.ibm.com, hca@linux.ibm.com, gor@linux.ibm.com, agordeev@linux.ibm.com, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, kgraul@linux.ibm.com, jaka@linux.ibm.com Cc: borntraeger@linux.ibm.com, svens@linux.ibm.com, alibuda@linux.alibaba.com, tonylu@linux.alibaba.com, raspl@linux.ibm.com, schnelle@linux.ibm.com, linux-s390@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org References: <1701343695-122657-1-git-send-email-guwen@linux.alibaba.com> <1701343695-122657-8-git-send-email-guwen@linux.alibaba.com> <8efa4f88-4ab1-bdd9-5705-93d62909bfa9@linux.alibaba.com> From: Alexandra Winter In-Reply-To: <8efa4f88-4ab1-bdd9-5705-93d62909bfa9@linux.alibaba.com> Content-Type: text/plain; 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Mon, 04 Dec 2023 04:58:19 -0800 (PST) On 04.12.23 13:36, Wen Gu wrote: >> Here we only check the first smcd device to determine whether we support v2. >> Which is ok, for today's platform firmware ISM devices, as they are always the same version. >> >> When you add virtual ISM devices (loopback-ism, virtio-ism) then this needs to be changed. >> IMO the logic then needs to be "if all smcd devices support v2, >> then smc_ism_v2_capable = true; >> else smc_ism_v2_capable = false;" >> > > Thank you. I will change this in the loopback-ism patch set. > > But I am wondering if loopback-ism coexists with s390 ISMv1, why smc_ism_v2_capable shouldn't be set? > Is it because the SEID generated in this way is not correct if the s390 ISMv2 does not exist? I think you're right: 'At least one IMSv2 device' is sufficient for smc_ism_v2_capable. Actually, we could even always do smc_ism_v2_capable=true, and append an empty ISMv2 device list. (I am not sure that would be a good idea...) Interesting sceanrios to consider for ism-loopback: e.g.: 2 ISMv1 device and 1 ism-loopback...