linux-kernel - Re: [PATCH 2/3] lightnvm: do no update csecs and sos on 1.2

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Message-ID: <9C271B60-C421-4C9B-99B6-C30B65494095@cnexlabs.com>
Date:   Tue, 11 Sep 2018 11:30:23 +0000
From:   Javier Gonzalez <javier@...xlabs.com>
To:     Javier Gonzalez <javier@...xlabs.com>
CC:     Matias Bjørling <mb@...htnvm.io>,
        "Konopko, Igor J" <igor.j.konopko@...el.com>,
        "marcin.dziegielewski@...el.com" <marcin.dziegielewski@...el.com>,
        "linux-block@...r.kernel.org" <linux-block@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/3] lightnvm: do no update csecs and sos on 1.2

> On 11 Sep 2018, at 10.50, Javier Gonzalez <javier@...xlabs.com> wrote:
> 
>> On 7 Sep 2018, at 12.28, Matias Bjørling <mb@...htnvm.io> wrote:
>> 
>> On 08/29/2018 12:09 PM, Javier González wrote:
>>> In the OCSSD 2.0 spec., the sector and metadata sizes are reported though
>>> the standard nvme identify command. Thus, the lightnvm subsystem needs
>>> to update this information on the geometry structure on bootup.
>>> Since 1.2 devices report these values on the OCSSD geometry identify,
>>> avoid this update is it is unnecessary and can also corrupt the geometry
>>> if the devices does not report the nvme sizes correctly (which is not
>>> required by the OCSSD 1.2 spec either) >
>>> Signed-off-by: Javier González <javier@...xlabs.com>
>>> ---
>>> drivers/nvme/host/lightnvm.c | 3 +++
>>> 1 file changed, 3 insertions(+)
>>> diff --git a/drivers/nvme/host/lightnvm.c b/drivers/nvme/host/lightnvm.c
>>> index 5bfa354c5dd5..33ed09f8410e 100644
>>> --- a/drivers/nvme/host/lightnvm.c
>>> +++ b/drivers/nvme/host/lightnvm.c
>>> @@ -980,6 +980,9 @@ void nvme_nvm_update_nvm_info(struct nvme_ns *ns)
>>> 	struct nvm_dev *ndev = ns->ndev;
>>> 	struct nvm_geo *geo = &ndev->geo;
>>> +	if (geo->version == NVM_OCSSD_SPEC_12)
>>> +		return;
>> 
>> The lba format sizes are not explicit in 2.0 either. For a conforming drive, it should implement the NVM Command Set and expose the LBA format correctly. Although, I do get your incentive, and if it is okay with you, I'll reword the commit message to this and apply it?:
>> 
>> "1.2 devices exposes their data and metadata size through the separate
>> identify command. Make sure that the NVMe LBA format does not override
>> these values."
> 
> Sounds good. I'll resend either way as I rebased on top of for-4.20/core
> - you can change the commit as you think it suits.

Since Igor will send a patch for the OOB, can you pick this up
separately? No changes needed after rebase.

Thanks,
Javier

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