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nvmet: add passthru io timeout value attr

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NVMeOF controller in the passsthru mode is capable of handling wide set
of I/O commands including vender specific passhtru io comands.

The vendor specific I/O commands are used to read the large drive
logs and can take longer than default NVMe commands, i.e. for
passthru requests the timeout value may differ from the passthru
controller's default timeout values (nvme-core:io_timeout).

Add a configfs attribute so that user can set the io timeout values.
In case if this configfs value is not set nvme_alloc_request() will set
the NVME_IO_TIMEOUT value when request queuedata is NULL.

Signed-off-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Chaitanya Kulkarni
2020-11-09 16:33:44 -08:00
committed by Christoph Hellwig
parent a2f6a2b8ce
commit 47e9730c26
3 changed files with 23 additions and 1 deletions
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20
drivers/nvme/target/configfs.c
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@@ -755,10 +755,30 @@ static ssize_t nvmet_passthru_admin_timeout_store(struct config_item *item,
}
CONFIGFS_ATTR(nvmet_passthru_, admin_timeout);
static ssize_t nvmet_passthru_io_timeout_show(struct config_item *item,
char *page)
{
return sprintf(page, "%u\n", to_subsys(item->ci_parent)->io_timeout);
}
static ssize_t nvmet_passthru_io_timeout_store(struct config_item *item,
const char *page, size_t count)
{
struct nvmet_subsys *subsys = to_subsys(item->ci_parent);
unsigned int timeout;
if (kstrtouint(page, 0, &timeout))
return -EINVAL;
subsys->io_timeout = timeout;
return count;
}
CONFIGFS_ATTR(nvmet_passthru_, io_timeout);
static struct configfs_attribute *nvmet_passthru_attrs[] = {
&nvmet_passthru_attr_device_path,
&nvmet_passthru_attr_enable,
&nvmet_passthru_attr_admin_timeout,
&nvmet_passthru_attr_io_timeout,
NULL,
};