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Fri, 23 Apr 2021 10:14:30 GMT Received: from d06av22.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 18B584C044; Fri, 23 Apr 2021 10:14:54 +0000 (GMT) Received: from d06av22.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 024644C040; Fri, 23 Apr 2021 10:14:54 +0000 (GMT) Received: from t480-pf1aa2c2.fritz.box (unknown [9.145.12.22]) by d06av22.portsmouth.uk.ibm.com (Postfix) with ESMTPS; Fri, 23 Apr 2021 10:14:53 +0000 (GMT) Received: from bblock by t480-pf1aa2c2.fritz.box with local (Exim 4.94) (envelope-from ) id 1lZspp-003mXD-Dj; Fri, 23 Apr 2021 12:14:53 +0200 Date: Fri, 23 Apr 2021 12:14:53 +0200 From: Benjamin Block To: James Smart Cc: Muneendra Kumar M , Benjamin Block , linux-block@vger.kernel.org, linux-scsi@vger.kernel.org, tj@kernel.org, linux-nvme@lists.infradead.org, hare@suse.de, emilne@redhat.com, mkumar@redhat.com, Steffen Maier Subject: Re: [PATCH v9 03/13] nvme: Added a newsysfs attribute appid_store Message-ID: References: <1617750397-26466-1-git-send-email-muneendra.kumar@broadcom.com> <1617750397-26466-4-git-send-email-muneendra.kumar@broadcom.com> <2eec720b-401a-32b4-80e6-900e136939b3@gmail.com> Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline In-Reply-To: <2eec720b-401a-32b4-80e6-900e136939b3@gmail.com> Sender: Benjamin Block X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: FO7eqQttv71Aw5OYgSl3W1FIYevepe1P X-Proofpoint-GUID: yFfvZg9kXtk3PpT38l9WXK9ZLvW5OBLP Content-Transfer-Encoding: 8bit X-Proofpoint-UnRewURL: 0 URL was un-rewritten MIME-Version: 1.0 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.391,18.0.761 definitions=2021-04-23_03:2021-04-23,2021-04-23 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 adultscore=0 impostorscore=0 suspectscore=0 priorityscore=1501 clxscore=1015 mlxlogscore=999 malwarescore=0 phishscore=0 mlxscore=0 spamscore=0 lowpriorityscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2104060000 definitions=main-2104230062 Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org On Thu, Apr 22, 2021 at 04:29:10PM -0700, James Smart wrote: > On 4/20/2021 4:09 AM, Benjamin Block wrote: > > On Tue, Apr 20, 2021 at 12:24:41PM +0530, Muneendra Kumar M wrote: > > > Hi Benjamin, > > > > > > > > --- > > > > > drivers/nvme/host/fc.c | 73 > > > > > +++++++++++++++++++++++++++++++++++++++++- > > > > > 1 file changed, 72 insertions(+), 1 deletion(-) > > > > > > > Hmm, I wonder why only NVMe-FC? Or is this just for the moment? We also > > > > have the FC transport class for SCSI; I assume this could feed the same > > > > IDs into the LLDs. > > > > > > At present it supports only for SCSI-FC . > > > > It does? By adding it to the implementation under `drivers/nvme/host/`? > > I am confused. > > Yeah, this is a little odd. > > This history is: we know we need to merge the scsi fc transport and the nvme > fc transport as the two independent things are creating difficulties and > duplications (devloss is an example). But it's a bit of work to change this > as it will move where the objects are in the topology tree. > > As we tried to figure out how to do the interaction with cgroups, we wanted > to support SCSI and nvme. If you look at how this new attribute sets the > vmid, it's somewhat generic - it just sets the fc appid field on a cgrp id. > There's really nothing that says the cgrp is on a block device that is scsi > or is nvme. It should work on devices regardless of their underlying > protocol type. Which then left the question - where to place such an > attribute. > > Given this is an "fc service" and as we knew the transport will be merged > eventually we picked to put it under /sys/class/fc point which is where we > expect to root the common transport. Ah ok, I think I confused it with the already existing `/sys/class/fc_host`/`/sys/class/fc_transport/`/..., but thats something different. Yeah, having some common ancestor makes sense, if the HBA offers multiple ULPs. > This class point happens to be owned/created by the nvme fc host code > for requesting nve-fc rediscovery events. It is odd that it creates a > requirement to load the nvme-fc transport in order to set values for > scsi fc devices, but we deemed it acceptable. Well, I mean, right now I don't have a immediate need for zfcp in this regard, so I don't want to blow this out of proportions. But like I said, we (zfcp) don't have a NVMe personality, so we never hook into NVMe-FC. > Guess we need to get going on that merged transport... Feel free to reach out, if there is anything coming up. -- Best Regards, Benjamin Block / Linux on IBM Z Kernel Development / IBM Systems IBM Deutschland Research & Development GmbH / https://www.ibm.com/privacy Vorsitz. 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Fri, 23 Apr 2021 10:14:30 GMT Received: from d06av22.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 18B584C044; Fri, 23 Apr 2021 10:14:54 +0000 (GMT) Received: from d06av22.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 024644C040; Fri, 23 Apr 2021 10:14:54 +0000 (GMT) Received: from t480-pf1aa2c2.fritz.box (unknown [9.145.12.22]) by d06av22.portsmouth.uk.ibm.com (Postfix) with ESMTPS; Fri, 23 Apr 2021 10:14:53 +0000 (GMT) Received: from bblock by t480-pf1aa2c2.fritz.box with local (Exim 4.94) (envelope-from ) id 1lZspp-003mXD-Dj; Fri, 23 Apr 2021 12:14:53 +0200 Date: Fri, 23 Apr 2021 12:14:53 +0200 From: Benjamin Block To: James Smart Cc: Muneendra Kumar M , Benjamin Block , linux-block@vger.kernel.org, linux-scsi@vger.kernel.org, tj@kernel.org, linux-nvme@lists.infradead.org, hare@suse.de, emilne@redhat.com, mkumar@redhat.com, Steffen Maier Subject: Re: [PATCH v9 03/13] nvme: Added a newsysfs attribute appid_store Message-ID: References: <1617750397-26466-1-git-send-email-muneendra.kumar@broadcom.com> <1617750397-26466-4-git-send-email-muneendra.kumar@broadcom.com> <2eec720b-401a-32b4-80e6-900e136939b3@gmail.com> Content-Disposition: inline In-Reply-To: <2eec720b-401a-32b4-80e6-900e136939b3@gmail.com> X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: FO7eqQttv71Aw5OYgSl3W1FIYevepe1P X-Proofpoint-GUID: yFfvZg9kXtk3PpT38l9WXK9ZLvW5OBLP X-Proofpoint-UnRewURL: 0 URL was un-rewritten MIME-Version: 1.0 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.391, 18.0.761 definitions=2021-04-23_03:2021-04-23, 2021-04-23 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 adultscore=0 impostorscore=0 suspectscore=0 priorityscore=1501 clxscore=1015 mlxlogscore=999 malwarescore=0 phishscore=0 mlxscore=0 spamscore=0 lowpriorityscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2104060000 definitions=main-2104230062 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210423_031506_030972_8DE1DCA7 X-CRM114-Status: GOOD ( 38.98 ) X-BeenThere: linux-nvme@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Sender: "Linux-nvme" Errors-To: linux-nvme-bounces+linux-nvme=archiver.kernel.org@lists.infradead.org On Thu, Apr 22, 2021 at 04:29:10PM -0700, James Smart wrote: > On 4/20/2021 4:09 AM, Benjamin Block wrote: > > On Tue, Apr 20, 2021 at 12:24:41PM +0530, Muneendra Kumar M wrote: > > > Hi Benjamin, > > > = > > > > > --- > > > > > drivers/nvme/host/fc.c | 73 > > > > > +++++++++++++++++++++++++++++++++++++++++- > > > > > 1 file changed, 72 insertions(+), 1 deletion(-) > > > = > > > > Hmm, I wonder why only NVMe-FC? Or is this just for the moment? We = also > > > > have the FC transport class for SCSI; I assume this could feed the = same > > > > IDs into the LLDs. > > > = > > > At present it supports only for SCSI-FC . > > = > > It does? By adding it to the implementation under `drivers/nvme/host/`? > > I am confused. > = > Yeah, this is a little odd. > = > This history is: we know we need to merge the scsi fc transport and the n= vme > fc transport as the two independent things are creating difficulties and > duplications (devloss is an example). But it's a bit of work to change th= is > as it will move where the objects are in the topology tree. > = > As we tried to figure out how to do the interaction with cgroups, we want= ed > to support SCSI and nvme. If you look at how this new attribute sets the > vmid, it's somewhat generic - it just sets the fc appid field on a cgrp i= d. > There's really nothing that says the cgrp is on a block device that is sc= si > or is nvme. It should work on devices regardless of their underlying > protocol type. Which then left the question - where to place such an > attribute. > = > Given this is an "fc service" and as we knew the transport will be merged > eventually we picked to put it under /sys/class/fc point which is where we > expect to root the common transport. = Ah ok, I think I confused it with the already existing `/sys/class/fc_host`/`/sys/class/fc_transport/`/..., but thats something different. Yeah, having some common ancestor makes sense, if the HBA offers multiple ULPs. > This class point happens to be owned/created by the nvme fc host code > for requesting nve-fc rediscovery events. It is odd that it creates a > requirement to load the nvme-fc transport in order to set values for > scsi fc devices, but we deemed it acceptable. Well, I mean, right now I don't have a immediate need for zfcp in this regard, so I don't want to blow this out of proportions. But like I said, we (zfcp) don't have a NVMe personality, so we never hook into NVMe-FC. > Guess we need to get going on that merged transport... Feel free to reach out, if there is anything coming up. -- = Best Regards, Benjamin Block / Linux on IBM Z Kernel Development / IBM Sys= tems IBM Deutschland Research & Development GmbH / https://www.ibm.com/pri= vacy Vorsitz. AufsR.: Gregor Pillen / Gesch=E4ftsf=FChrung: Dirk = Wittkopp Sitz der Gesellschaft: B=F6blingen / Registergericht: AmtsG Stuttgart, HRB = 243294 _______________________________________________ Linux-nvme mailing list Linux-nvme@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-nvme