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diff --git a/Documentation/nvme-io-passthru.txt b/Documentation/nvme-io-passthru.txt new file mode 100644 index 0000000..3ad5231 --- /dev/null +++ b/Documentation/nvme-io-passthru.txt @@ -0,0 +1,138 @@ +nvme-io-passthru(1) +=================== + +NAME +---- +nvme-io-passthru - Submit an arbitrary io command, return results + +SYNOPSIS +-------- +[verse] +'nvme-io-passthru' <device> [--opcode=<opcode> | -O <opcode>] + [--flags=<flags> | -f <flags>] [-rsvd=<rsvd> | -R <rsvd>] + [--namespace-id=<nsid> | -nsid <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>] + [--read | -r] [--write | -w] + [--input-file=<file> | -i <file>] + [--metadata=<file> | -M <file>] + [--timeout=<to> | -t <to>] [--show-command | -s] + [--dry-run | -d] [--raw-binary | -b] + [--prefill=<prefill> | -p <prefill>] + [--latency | -T] + [--output-format=<fmt> | -o <fmt>] [--verbose | -v] + +DESCRIPTION +----------- +Submits an arbitrary NVMe IO command and returns the applicable +results. This may be the simply the command's 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. Defaults to '0'. + +--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. If the command is a data-in (read) command, the data + returned from the device will be saved here. + +-M <file>:: +--metadata=<file>:: + If the command is a data-out (write) command, use this file + to fill the metadata buffer sent to the device. If no file is given, + assumed to use STDIN. If the command is a data-in (read) command, the + metadata returned from the device will be saved here. + +-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 + data or a structure. + +-p <prefill>:: +--prefill <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 on a data-in command. + +-T:: +--latency:: + Print out the latency the IOCTL took (in us). + +-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. + +EXAMPLES +-------- + +nvme io-passthru /dev/nvme0n1 --opcode=2 --namespace-id=1 --data-len=4096 --read --cdw10=0 --cdw11=0 --cdw12=0x70000 --raw-binary + +NVME +---- +Part of the nvme-user suite |