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nvme: add function to get ZNS max open zones

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Add a function to get the number of max open zones for a zoned
namespace.

The value inside the identify namespace struct is a 0's based value,
where 0xffffffff means unlimited.
If unlimited, the addition will overflow and return 0,
which is the intended value to represent unlimited for this API.

Signed-off-by: Niklas Cassel <niklas.cassel@wdc.com>
Change-Id: I4223146bc1ddf90486892a0af5fe5ce006dc5fd3
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/6442
Community-CI: Broadcom CI
Community-CI: Mellanox Build Bot
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>
Reviewed-by: sunshihao <sunshihao@huawei.com>
Reviewed-by: Shuhei Matsumoto <shuhei.matsumoto.xt@hitachi.com>
This commit is contained in:
Niklas Cassel 2021-02-16 12:40:55 +00:00 committed by Tomasz Zawadzki
parent 74c43a7446
commit bb5330c06d
3 changed files with 26 additions and 0 deletions
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17
include/spdk/nvme_zns.h
View File

@ -96,6 +96,23 @@ uint64_t spdk_nvme_zns_ns_get_zone_size(struct spdk_nvme_ns *ns);
*/
uint64_t spdk_nvme_zns_ns_get_num_zones(struct spdk_nvme_ns *ns);
/**
* Get the maximum number of open zones for the given namespace.
*
* An open zone is a zone in any of the zone states:
* EXPLICIT OPEN or IMPLICIT OPEN.
*
* If this value is 0, there is no limit.
*
* This function is thread safe and can be called at any point while the controller
* is attached to the SPDK NVMe driver.
*
* \param ns Namespace to query.
*
* \return the maximum number of open zones.
*/
uint32_t spdk_nvme_zns_ns_get_max_open_zones(struct spdk_nvme_ns *ns);
/**
* Get the Zoned Namespace Command Set Specific Identify Controller data
* as defined by the NVMe Zoned Namespace Command Set Specification.

8
lib/nvme/nvme_zns.c
View File

@ -60,6 +60,14 @@ spdk_nvme_zns_ns_get_num_zones(struct spdk_nvme_ns *ns)
return spdk_nvme_ns_get_num_sectors(ns) / spdk_nvme_zns_ns_get_zone_size_sectors(ns);
}
uint32_t
spdk_nvme_zns_ns_get_max_open_zones(struct spdk_nvme_ns *ns)
{
const struct spdk_nvme_zns_ns_data *nsdata_zns = spdk_nvme_zns_ns_get_data(ns);
return nsdata_zns->mor + 1;
}
const struct spdk_nvme_zns_ctrlr_data *
spdk_nvme_zns_ctrlr_get_data(struct spdk_nvme_ctrlr *ctrlr)
{

1
lib/nvme/spdk_nvme.map
View File

@ -173,6 +173,7 @@
spdk_nvme_zns_ns_get_zone_size_sectors;
spdk_nvme_zns_ns_get_zone_size;
spdk_nvme_zns_ns_get_num_zones;
spdk_nvme_zns_ns_get_max_open_zones;
spdk_nvme_zns_ctrlr_get_data;
spdk_nvme_zns_ctrlr_get_max_zone_append_size;
spdk_nvme_zns_zone_append;