NAME

       nvme-id-ctrl - Send NVMe Identify Controller, return result and structure

SYNOPSIS

       nvme id-ctrl <device> [-v | --vendor-specific] [-b | --raw-binary]
                               [-o <fmt> | --output-format=<fmt>]

DESCRIPTION

       For the NVMe device given, sends an identify controller command and provides the result
       and returned structure.

       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 structure may be returned in one of several ways depending on the option
       flags; the structure may be parsed by the program or the raw buffer may be printed to
       stdout.

OPTIONS

       -b, --raw-binary
           Print the raw buffer to stdout. Structure is not parsed by program. This overrides the
           vendor specific and human readable options.

       -v, --vendor-specific
           In addition to parsing known fields, this option will dump the vendor specific region
           of the structure in hex with ascii interpretation.

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

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

EXAMPLES

       •   Has the program interpret the returned buffer and display the known fields in a human
           readable format:

               # nvme id-ctrl /dev/nvme0

       •   In addition to showing the known fields, has the program to display the vendor unique
           field:

               # nvme id-ctrl /dev/nvme0 --vendor-specific
               # nvme id-ctrl /dev/nvme0 -v

           The above will dump the vs buffer in hex since it doesn’t know how to interpret it.

       •   Have the program return the raw structure in binary:

               # nvme id-ctrl /dev/nvme0 --raw-binary > id_ctrl.raw
               # nvme id-ctrl /dev/nvme0 -b > id_ctrl.raw

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

       •   Alternatively you may want to send the data to another program that can parse the raw
           buffer.

               # nvme id-ctrl /dev/nvme0 --raw-binary | nvme_parse_id_ctrl

           The parse program in the above example can be a program that shows the structure in a
           way you like. The following program is such an example that will parse it and can
           accept the output through a pipe, '|', as shown in the above example, or you can 'cat'
           a saved output buffer to it.

           /* File: nvme_parse_id_ctrl.c */

           #include <linux/nvme.h>
           #include <stdio.h>
           #include <unistd.h>

           int main(int argc, char **argv)
           {
                   unsigned char buf[sizeof(struct nvme_id_ctrl)];
                   struct nvme_id_ctrl *ctrl = (struct nvme_id_ctrl *)buf;

                   if (read(STDIN_FILENO, buf, sizeof(buf)))
                           return 1;

                   printf("vid   : %#x\n", ctrl->vid);
                   printf("ssvid : %#x\n", ctrl->ssvid);
                   return 0;
           }

NVME

       Part of the nvme-user suite