linux-kernel - Re: [PATCH v3 4/5] nvme: Implement resume_from

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Message-ID: <20161219222311.GA2056@sbauer-Z170X-UD5>
Date:   Mon, 19 Dec 2016 15:23:12 -0700
From:   Scott Bauer <scott.bauer@...el.com>
To:     Keith Busch <keith.busch@...el.com>
Cc:     linux-nvme@...ts.infradead.org, Rafael.Antognolli@...el.com,
        axboe@...com, jonathan.derrick@...el.com, viro@...iv.linux.org.uk,
        hch@...radead.org, linux-kernel@...r.kernel.org, sagi@...mberg.me
Subject: Re: [PATCH v3 4/5] nvme: Implement resume_from_suspend and SED
 Allocation code.

On Mon, Dec 19, 2016 at 04:59:54PM -0500, Keith Busch wrote:
> On Mon, Dec 19, 2016 at 12:35:48PM -0700, Scott Bauer wrote:
> > +static int nvme_sec_submit(struct nvme_ctrl *ctrl, u16 spsp, u8 secp,
> > +			   void *buffer, size_t len, u8 opcode)
> > +{
> > +	struct nvme_command cmd = { 0 };
> > +	struct nvme_ns *ns = NULL;
> > +
> > +	mutex_lock(&ctrl->namespaces_mutex);
> > +	if (!list_empty(&ctrl->namespaces))
> > +		ns = list_first_entry(&ctrl->namespaces, struct nvme_ns, list);
> > +
> > +	mutex_unlock(&ctrl->namespaces_mutex);
> > +	if (!ns)
> > +		return -ENODEV;
> > +
> > +	cmd.common.opcode = opcode;
> > +	cmd.common.nsid = ns->ns_id;
> 
> Should be:
> 
> 	cmd.common.nsid = cpu_to_le32(ns->ns_id);
> 
> But now wondering how you can send a security command to different
> namespaces. That's why I thought it'd make more sense to threa this
> through block_device, but maybe Christoph had some idea on how to get
> the same functionality without that?


I went back and reviewed the spec 1.2.1:

http://www.nvmexpress.org/wp-content/uploads/NVM_Express_1_2_1_Gold_20160603.pdf
Section 5.18 (page 140->141)

Describes the security send command type and it doesn't have any reference of
a namespace ID. Anecdotally, I just removed the ns->ns_id line from the code and
everything still works as intended. Is there another portion of the spec or errata
that requires ns_id? (I can't access 1.2.1 errta the link doesn't work).