nvme-get-feature - Gets an NVMe feature, returns applicable results

       Submits an NVMe Get Feature admin command and returns the applicable results. This may be the feature’s
       value, or may also include a feature structure if the feature requires it (ex: LBA Range Type).

       The <device> parameter is mandatory and may be either the NVMe character device (ex: /dev/nvme0), or a
       namespace block device (ex: /dev/nvme0n1).

       On success, the returned feature’s structure (if applicable) may be returned in one of several ways
       depending on the option flags; the structure may parsed by the program and printed in a readable format
       if it is a known structure, displayed in hex, or the raw buffer may be printed to stdout for another
       program to parse.

       •   Retrieves the feature for Number of Queues, or feature id 7:

               # nvme get-feature /dev/nvme0 -f 7

       •   The following retrieves the feature for the LBA Range Type, which implicitly requires a buffer and
           will be printed to the screen in human readable format:

               # nvme get-feature /dev/nvme0 -f 3

       •   Retrieves the feature for the some vendor specific feature and specifically requesting a buffer be
           allocate for this feature, which will be displayed to the user in as a hex dump:

               # nvme get-feature /dev/nvme0 -f 0xc0 -l 512

           Get feature with UUID index

           # nvme get-feature /dev/nvme0 -f 0xc0 -l 512 -U 0x1

       •   The following retrieves the feature for the LBA Range Type, which implicitly requires a buffer and
           will be saved to a file in its raw format:

               # nvme get-feature /dev/nvme0 -f 3 --raw-binary > lba_range.raw

           It is probably a bad idea to not redirect stdout when using this mode.

       nvme-get-feature - Gets an NVMe feature, returns applicable results

       Part of the nvme-user suite

NVMe                                               02/16/2025                                NVME-GET-FEATURE(1)

       -n <nsid>, --namespace-id=<nsid>
           Retrieve the feature for the given nsid. This is optional and most features do not use this value.

       -f <fid>, --feature-id=<fid>
           The feature id to send with the command. Value provided should be in hex.

       -s <select>, --sel=<select>
           Select (SEL): This field specifies which value of the attributes to return in the provided data:
           ┌────────┬────────────────────────┐
           │ Select │ Description            │
           ├────────┼────────────────────────┤
           │ 0      │ Current                │
           ├────────┼────────────────────────┤
           │ 1      │ Default                │
           ├────────┼────────────────────────┤
           │ 2      │ Saved                  │
           ├────────┼────────────────────────┤
           │ 3      │ Supported capabilities │
           ├────────┼────────────────────────┤
           │ 4-7    │ Reserved               │
           └────────┴────────────────────────┘

       -U <uuid-index>, --uuid-index=<uuid-index>
           UUID Index of the feature

       -l <data-len>, --data-len=<data-len>
           The data length for the buffer returned for this feature. Most known features do not use this value.
           The exception is LBA Range Type

       -c <cdw11>, --cdw11=<cdw11>
           The value for command dword 11, if applicable.

       -b, --raw-binary
           Print the raw feature buffer to stdout if the feature returns a structure.

       -H, --human-readable
           This option will parse and format many of the bit fields into human-readable formats.

       -C, --changed
           This option will show feature changed.

       -o <fmt>, --output-format=<fmt>
           Set the reporting format to normal, json or binary. Only one output format can be used at a time.

       -v, --verbose
           Increase the information detail in the output.

       -t <timeout>, --timeout=<timeout>
           Override default timeout value. In milliseconds.

nvmeget-feature <device> [--namespace-id=<nsid> | -n <nsid>]
                               [--feature-id=<fid> | -f <fid>]
                               [--uuid-index=<uuid-index> | -U <uuid_index>]
                               [--data-len=<data-len> | -l <data-len>]
                               [--sel=<select> | -s <select>]
                               [--raw-binary | -b] [--cdw11=<cdw11> | -c <cdw11>]
                               [--human-readable | -H] [--changed | -C]
                               [--output-format=<fmt> | -o <fmt>] [--verbose | -v]
                               [--timeout=<timeout> | -t <timeout>]