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Diffstat (limited to 'Documentation/nvme-id-ctrl.txt')
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diff --git a/Documentation/nvme-id-ctrl.txt b/Documentation/nvme-id-ctrl.txt new file mode 100644 index 0000000..b9fcffc --- /dev/null +++ b/Documentation/nvme-id-ctrl.txt @@ -0,0 +1,113 @@ +nvme-id-ctrl(1) +=============== + +NAME +---- +nvme-id-ctrl - Send NVMe Identify Controller, return result and structure + +SYNOPSIS +-------- +[verse] +'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 |