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Document the passthru commands.

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Reviewed by: bcr@ (earlier version)
Differential Revision: https://reviews.freebsd.org/D24639
This commit is contained in:
Warner Losh 2020-05-01 20:29:51 +00:00
parent a41b48ea12
commit e2d6a6e938
2 changed files with 71 additions and 1 deletions
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70
sbin/nvmecontrol/nvmecontrol.8
View File

@ -194,6 +194,14 @@
.\" .Nm
.\" .Ic wdc purge-monitor
.\" .Aq device-id
.Nm
.Ic admin-passthru
.Op args
.Aq Ar device-id
.Nm
.Ic io-passthru
.Op args
.Aq Ar namespace-id
.Sh DESCRIPTION
NVM Express (NVMe) is a storage protocol standard, for SSDs and other
high-speed storage devices over PCI Express.
@ -466,6 +474,68 @@ the drive's serial number and the type of dump it is followed
by .bin.
These logs must be sent to the vendor for analysis.
This tool only provides a way to extract them.
.Ss passthru
The
.Dq admin-passthru
and
.Dq io-passthru
commands send NVMe commands to
either the administrative or the data part of the device.
These commands are expected to be compatible with nvme-cli.
Please see
.St The NVMe Standard
for details.
.Bl -tag -width 16n
.It Fl o -opcode Ar opcode
Opcode to send.
.It Fl 2 -cdw2 Ar value
32-bit value for CDW2.
.It Fl 3 -cdw3 Ar value
32-bit value for CDW3.
.It Fl 4 -cdw10 Ar value
32-bit value for CDW10.
.It Fl 5 -cdw11 Ar value
32-bit value for CDW11.
.It Fl 6 -cdw12 Ar value
32-bit value for CDW12.
.It Fl 7 -cdw13 Ar value
32-bit value for CDW13.
.It Fl 8 -cdw14 Ar value
32-bit value for CDW14.
.It Fl 9 -cdw15 Ar value
32-bit value for CDW15.
.It Fl l -data-len
Length of the data for I/O (bytes).
.It Fl m -metadata-len
Length of the metadata segment for command (bytes).
This is ignored and not implemented in
.Xr nvme 4 .
.It Fl f -flags
Nvme command flags.
.It Fl n -namespace-id
Namespace ID for command (Ignored).
.It Fl p -prefill
Value to prefill payload with.
.It Fl b -raw-binary
Output in binary format (otherwise a hex dump is produced).
.It Fl d -dry-run
Do not actually execute the command, but perform sanity checks on it.
.It Fl r -read
Command reads data from the device.
.It Fl s -show-command
Show all the command values on stdout.
.It Fl w -write
Command writes data to the device.
.El
Send arbitrary commands to the device.
Can be used to extract vendor specific logs.
Transfers to/from the device possible, but limited to
.Dv MAXPHYS
bytes.
Commands either read data or write it, but not both.
Commands needing metadata are not supported by the
.Xr nvme 4
drive.
.Sh DEVICE NAMES
Where
.Aq Ar namespace-id

2
sbin/nvmecontrol/passthru.c
View File

@ -292,7 +292,7 @@ static struct cmd io_pass_cmd = {
.ctx_size = sizeof(struct options),
.opts = opts,
.args = args,
.descr = "Send a pass through Admin command to the specified device",
.descr = "Send a pass through I/O command to the specified device",
};
CMD_COMMAND(admin_pass_cmd);