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From: Max Gurtovoy <maxg@mellanox.com>
To: Logan Gunthorpe <logang@deltatee.com>,
	<linux-kernel@vger.kernel.org>, <linux-nvme@lists.infradead.org>,
	<linux-block@vger.kernel.org>, <linux-fsdevel@vger.kernel.org>
Cc: Christoph Hellwig <hch@lst.de>, Sagi Grimberg <sagi@grimberg.me>,
	"Keith Busch" <kbusch@kernel.org>, Jens Axboe <axboe@fb.com>,
	Chaitanya Kulkarni <Chaitanya.Kulkarni@wdc.com>,
	Stephen Bates <sbates@raithlin.com>
Subject: Re: [PATCH v7 11/14] nvmet-configfs: introduce passthru configfs interface
Date: Thu, 15 Aug 2019 15:46:16 +0300
Message-ID: <28a807ae-fbba-5016-3b71-04baa121e522@mellanox.com> (raw)
In-Reply-To: <20190801234514.7941-12-logang@deltatee.com>


On 8/2/2019 2:45 AM, Logan Gunthorpe wrote:
> When CONFIG_NVME_TARGET_PASSTHRU as 'passthru' directory will
> be added to each subsystem. The directory is similar to a namespace
> and has two attributes: device_path and enable. The user must set the
> path to the nvme controller's char device and write '1' to enable the
> subsystem to use passthru.
>
> Any given subsystem is prevented from enabling both a regular namespace
> and the passthru device. If one is enabled, enabling the other will
> produce an error.
>
> Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
> ---
>   drivers/nvme/target/configfs.c | 99 ++++++++++++++++++++++++++++++++++
>   drivers/nvme/target/nvmet.h    |  1 +
>   2 files changed, 100 insertions(+)
>
> diff --git a/drivers/nvme/target/configfs.c b/drivers/nvme/target/configfs.c
> index 98613a45bd3b..b15d64c19f58 100644
> --- a/drivers/nvme/target/configfs.c
> +++ b/drivers/nvme/target/configfs.c
> @@ -615,6 +615,103 @@ static const struct config_item_type nvmet_namespaces_type = {
>   	.ct_owner		= THIS_MODULE,
>   };
>   
> +#ifdef CONFIG_NVME_TARGET_PASSTHRU
> +
> +static ssize_t nvmet_passthru_device_path_show(struct config_item *item,
> +		char *page)
> +{
> +	struct nvmet_subsys *subsys = to_subsys(item->ci_parent);
> +
> +	return snprintf(page, PAGE_SIZE, "%s\n", subsys->passthru_ctrl_path);
> +}
> +
> +static ssize_t nvmet_passthru_device_path_store(struct config_item *item,
> +		const char *page, size_t count)
> +{
> +	struct nvmet_subsys *subsys = to_subsys(item->ci_parent);
> +	int ret = -ENOMEM;

seems like a redundant initialization.

> +	size_t len;
> +
> +	mutex_lock(&subsys->lock);
> +
> +	ret = -EBUSY;
> +	if (subsys->passthru_ctrl)
> +		goto out_unlock;
> +
> +	ret = -EINVAL;
> +	len = strcspn(page, "\n");
> +	if (!len)
> +		goto out_unlock;
> +
> +	kfree(subsys->passthru_ctrl_path);
> +	ret = -ENOMEM;
> +	subsys->passthru_ctrl_path = kstrndup(page, len, GFP_KERNEL);
> +	if (!subsys->passthru_ctrl_path)
> +		goto out_unlock;
> +
> +	mutex_unlock(&subsys->lock);
> +
> +	return count;
> +out_unlock:
> +	mutex_unlock(&subsys->lock);
> +	return ret;
> +}
> +CONFIGFS_ATTR(nvmet_passthru_, device_path);
> +
> +static ssize_t nvmet_passthru_enable_show(struct config_item *item,
> +		char *page)
> +{
> +	struct nvmet_subsys *subsys = to_subsys(item->ci_parent);
> +
> +	return sprintf(page, "%d\n", subsys->passthru_ctrl ? 1 : 0);
> +}
> +
> +static ssize_t nvmet_passthru_enable_store(struct config_item *item,
> +		const char *page, size_t count)
> +{
> +	struct nvmet_subsys *subsys = to_subsys(item->ci_parent);
> +	bool enable;
> +	int ret = 0;
> +
> +	if (strtobool(page, &enable))
> +		return -EINVAL;
> +
> +	if (enable)
> +		ret = nvmet_passthru_ctrl_enable(subsys);
> +	else
> +		nvmet_passthru_ctrl_disable(subsys);
> +
> +	return ret ? ret : count;
> +}
> +CONFIGFS_ATTR(nvmet_passthru_, enable);
> +
> +static struct configfs_attribute *nvmet_passthru_attrs[] = {
> +	&nvmet_passthru_attr_device_path,
> +	&nvmet_passthru_attr_enable,
> +	NULL,
> +};
> +
> +static const struct config_item_type nvmet_passthru_type = {
> +	.ct_attrs		= nvmet_passthru_attrs,
> +	.ct_owner		= THIS_MODULE,
> +};
> +
> +static void nvmet_add_passthru_group(struct nvmet_subsys *subsys)
> +{
> +	config_group_init_type_name(&subsys->passthru_group,
> +				    "passthru", &nvmet_passthru_type);
> +	configfs_add_default_group(&subsys->passthru_group,
> +				   &subsys->group);
> +}
> +
> +#else /* CONFIG_NVME_TARGET_PASSTHRU */
> +
> +static void nvmet_add_passthru_group(struct nvmet_subsys *subsys)
> +{
> +}
> +
> +#endif /* CONFIG_NVME_TARGET_PASSTHRU */
> +
>   static int nvmet_port_subsys_allow_link(struct config_item *parent,
>   		struct config_item *target)
>   {
> @@ -915,6 +1012,8 @@ static struct config_group *nvmet_subsys_make(struct config_group *group,
>   	configfs_add_default_group(&subsys->allowed_hosts_group,
>   			&subsys->group);
>   
> +	nvmet_add_passthru_group(subsys);
> +
>   	return &subsys->group;
>   }
>   
> diff --git a/drivers/nvme/target/nvmet.h b/drivers/nvme/target/nvmet.h
> index 6436cb990905..f9c593f1305d 100644
> --- a/drivers/nvme/target/nvmet.h
> +++ b/drivers/nvme/target/nvmet.h
> @@ -231,6 +231,7 @@ struct nvmet_subsys {
>   #ifdef CONFIG_NVME_TARGET_PASSTHRU
>   	struct nvme_ctrl	*passthru_ctrl;
>   	char			*passthru_ctrl_path;
> +	struct config_group	passthru_group;
>   #endif /* CONFIG_NVME_TARGET_PASSTHRU */
>   };
>   

  reply index

Thread overview: 34+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-01 23:44 [PATCH v7 00/14] nvmet: add target passthru commands support Logan Gunthorpe
2019-08-01 23:45 ` [PATCH v7 01/14] nvme-core: introduce nvme_ctrl_get_by_path() Logan Gunthorpe
2019-08-14 14:20   ` Max Gurtovoy
2019-08-15 11:46   ` Max Gurtovoy
2019-08-15 15:59     ` Logan Gunthorpe
2019-08-01 23:45 ` [PATCH v7 02/14] nvme-core: export existing ctrl and ns interfaces Logan Gunthorpe
2019-08-01 23:45 ` [PATCH v7 03/14] nvmet: add return value to nvmet_add_async_event() Logan Gunthorpe
2019-08-14 14:26   ` Max Gurtovoy
2019-08-14 16:59     ` Logan Gunthorpe
2019-08-01 23:45 ` [PATCH v7 04/14] nvmet: make nvmet_copy_ns_identifier() non-static Logan Gunthorpe
2019-08-14 14:29   ` Max Gurtovoy
2019-08-15  7:15     ` Chaitanya Kulkarni
2019-08-01 23:45 ` [PATCH v7 05/14] nvmet-passthru: update KConfig with config passthru option Logan Gunthorpe
2019-08-14 14:31   ` Max Gurtovoy
2019-08-01 23:45 ` [PATCH v7 06/14] nvmet-passthru: add passthru code to process commands Logan Gunthorpe
2019-08-01 23:45 ` [PATCH v7 07/14] nvmet-passthru: add enable/disable helpers Logan Gunthorpe
2019-08-15 12:20   ` Max Gurtovoy
2019-08-15 16:02     ` Logan Gunthorpe
2019-08-01 23:45 ` [PATCH v7 08/14] nvmet-core: allow one host per passthru-ctrl Logan Gunthorpe
2019-08-15 12:36   ` Max Gurtovoy
2019-08-15 16:06     ` Logan Gunthorpe
2019-08-18 10:33       ` Max Gurtovoy
2019-08-22  0:09         ` Sagi Grimberg
2019-08-22  8:50           ` Max Gurtovoy
2019-08-22 17:41             ` Sagi Grimberg
2019-08-22 19:17               ` Sagi Grimberg
2019-08-22 19:41                 ` Logan Gunthorpe
2019-08-01 23:45 ` [PATCH v7 09/14] nvmet-core: don't check the data len for pt-ctrl Logan Gunthorpe
2019-08-01 23:45 ` [PATCH v7 10/14] nvmet-tcp: don't check data_len in nvmet_tcp_map_data() Logan Gunthorpe
2019-08-01 23:45 ` [PATCH v7 11/14] nvmet-configfs: introduce passthru configfs interface Logan Gunthorpe
2019-08-15 12:46   ` Max Gurtovoy [this message]
2019-08-01 23:45 ` [PATCH v7 12/14] block: don't check blk_rq_is_passthrough() in blk_do_io_stat() Logan Gunthorpe
2019-08-01 23:45 ` [PATCH v7 13/14] block: call blk_account_io_start() in blk_execute_rq_nowait() Logan Gunthorpe
2019-08-01 23:45 ` [PATCH v7 14/14] nvmet-passthru: support block accounting Logan Gunthorpe

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