linux-kernel - Re: [PATCH v4 7/8] nvmet: allow overriding the NVMe VS via configfs

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Date:   Sun, 4 Jun 2017 18:08:42 +0300
From:   Sagi Grimberg <sagi@...mberg.me>
To:     Johannes Thumshirn <jthumshirn@...e.de>,
        Christoph Hellwig <hch@....de>,
        Keith Busch <keith.busch@...el.com>
Cc:     Hannes Reinecke <hare@...e.de>, maxg@...lanox.com,
        Linux NVMe Mailinglist <linux-nvme@...ts.infradead.org>,
        Linux Kernel Mailinglist <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 7/8] nvmet: allow overriding the NVMe VS via configfs



On 04/06/17 13:36, Johannes Thumshirn wrote:
> Allow overriding the announced NVMe Version of a via configfs.
> 
> This is particularly helpful when debugging new features for the host
> or target side without bumping the hard coded version (as the target
> might not be fully compliant to the announced version yet).
> 
> Signed-off-by: Johannes Thumshirn <jthumshirn@...e.de>
> ---
>   drivers/nvme/target/configfs.c | 34 ++++++++++++++++++++++++++++++++++
>   include/linux/nvme.h           |  4 ++++
>   2 files changed, 38 insertions(+)
> 
> diff --git a/drivers/nvme/target/configfs.c b/drivers/nvme/target/configfs.c
> index 16f9f6e3a084..45421d4308a4 100644
> --- a/drivers/nvme/target/configfs.c
> +++ b/drivers/nvme/target/configfs.c
> @@ -650,8 +650,42 @@ static ssize_t nvmet_subsys_attr_allow_any_host_store(struct config_item *item,
>   
>   CONFIGFS_ATTR(nvmet_subsys_, attr_allow_any_host);
>   
> +static ssize_t nvmet_subsys_version_show(struct config_item *item,
> +					      char *page)
> +{
> +	struct nvmet_subsys *subsys = to_subsys(item);
> +	int major, minor, tertiary;
> +	u32 ver;
> +
> +	ver = subsys->ver;
> +	major = NVME_MAJOR(ver);
> +	minor = NVME_MINOR(ver);
> +	tertiary = NVME_TERRIARY(ver);
> +
> +	return snprintf(page, PAGE_SIZE, "%d %d %d\n", major, minor, tertiary);

Nit: maybe a dot separator would be better? e.g. "1.3.0" rather than
"1 3 0"

Otherwise looks good,

Reviewed-by: Sagi Grimberg <sagi@...mberg.me>