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| -rw-r--r-- | Documentation/nvme-admin-passthru.txt | 133 |
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diff --git a/Documentation/nvme-admin-passthru.txt b/Documentation/nvme-admin-passthru.txt new file mode 100644 index 0000000..ce452fa --- /dev/null +++ b/Documentation/nvme-admin-passthru.txt @@ -0,0 +1,133 @@ +nvme-admin-passthru(1) +====================== + +NAME +---- +nvme-admin-passthru - Submit an arbitrary admin command, return results + +SYNOPSIS +-------- +[verse] +'nvme-admin-passthru' <device> [--opcode=<opcode> | -o <opcode>] + [--flags=<flags> | -f <flags>] [-rsvd=<rsvd> | -R <rsvd>] + [--namespace-id=<nsid>] [--cdw2=<cdw2>] [--cdw3=<cdw3>] + [--cdw10=<cdw10>] [--cdw11=<cdw11>] [--cdw12=<cdw12>] + [--cdw13=<cdw13>] [--cdw14=<cdw14>] [--cdw15=<cdw15>] + [--data-len=<data-len> | -l <data-len>] + [--metadata-len=<len> | -m <len>] + [--input-file=<file> | -i <file>] + [--read | -r ] [--write | -w] + [--timeout=<to> | -t <to>] + [--show-command | -s] + [--dry-run | -d] + [--raw-binary | -b] + [--prefill=<prefill> | -p <prefill>] + [--latency | -T] + +DESCRIPTION +----------- +Submits an arbitrary NVMe admin command and returns the applicable +results. This may be the simply the commands result and status, or may +also include a buffer if the command returns one. This command does no +interpretation of the opcodes or options. + +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 structure (if applicable) may be returned in +one of several ways depending on the option flags; the structure may +printed by the program as a hex dump, or may be returned as a raw buffer +printed to stdout for another program to parse. + +OPTIONS +------- +-o <opcode>:: +--opcode=<opcode>:: + The NVMe opcode to send to the device in the command + +-f <flags>:: +--flags=<flags>:: + The NVMe command flags to send to the device in the command + +-R <rsvd>:: +--rsvd=<rsvd>:: + The value for the reserved field in the command. + +-n <nsid>:: +--namespace-id=<nsid>:: + The value for the ns-id in the command. + +--cdw[2-3,10-15]=<cdw>:: + Specifies the command dword value for that specified entry in + the command + +-r:: +--read:: +-w:: +--write:: + Used for the data-direction for the command and required for + commands sending/receiving data. Don't use both read and write + at the same time. + +-i <file>:: +--input-file=<file>:: + If the command is a data-out (write) command, use this file + to fill the buffer sent to the device. If no file is given, + assumed to use STDIN. + +-l <data-len>:: +--data-len=<data-len>:: + The data length for the buffer used for this command. + +-m <data-len>:: +--metadata-len=<data-len>:: + The metadata length for the buffer used for this command. + +-s:: +--show-cmd:: + Print out the command to be sent. + +-d:: +--dry-run:: + Do not actually send the command. If want to use --dry-run option, + --show-cmd option _must_ be set. Otherwise --dry-run option will be + _ignored_. + +-b:: +--raw-binary:: + Print the raw returned buffer to stdout if the command returns + a structure. + +-p:: +--prefill:: + Prefill the buffer with a predetermined byte value. Defaults to 0. + This may be useful if the data you are writing is shorter + than the required buffer, and you need to pad it with a known + value. It may also be useful if you need to confirm if a device + is overwriting a buffer for a data-in command. + +-T:: +--latency:: + Print out the latency the IOCTL took (in us). + +EXAMPLES +-------- +* The following will run the admin command with opcode=6 and cdw10=1, which + corresponds to an identify controller command. This example requires the + data-len param be 4096, which is the size of the returned structure. The -r + option is used because it is a data-in command ++ +------------ +# nvme admin-passthru /dev/nvme0 --opcode=06 --data-len=4096 --cdw10=1 -r +------------ ++ + +* Or if you want to save that structure to a file: ++ +------------ +# nvme admin-passthru /dev/nvme0 --opcode=06 --data-len=4096 --cdw10=1 -r -b > id_ns.raw +------------ + +NVME +---- +Part of the nvme-user suite |