NAME¶
srp_daemon - Discovers SRP targets in an InfiniBand Fabric
SYNOPSIS¶
srp_daemon [-vVcaeon] [-d umad-device | -i infiniband-device
[-p port-num]] [-t timeout(ms)] [-r retries] [-R
Rescan-time] [-f rules-File]
DESCRIPTION¶
Discovers and connects to InfiniBand SCSI RDMA Protocol (SRP) targets in an IB
fabric.
Each srp_daemon instance operates on one local port. Upon boot it performs a
full rescan of the fabric then waits for an srp_daemon event. An srp_daemon
event can be a join of a new machine to the fabric, a change in the
capabilities of a machine, an SA change, or an expiration of a predefined
timeout.
When a new machine joins the fabric, srp_daemon checks if it is a target. When
there is a change of capabilities, srp_daemon checks if the machine has turned
into a target. When there is an SA change or a timeout expiration, srp_daemon
performs a full rescan of the fabric.
For each target srp_daemon finds, it checks if it should connect to this target
according to its rules (default rules file is /etc/srp_daemon.conf) and if it
is already connected to the local port. If it should connect to this target
and if it is not connected yet, srp_daemon can either print the target details
or connect to it.
OPTIONS¶
- -v
- Print more verbose output
- -V
- Print even more verbose output (debug mode)
- -i infiniband-device
- Work on infiniband-device. This option should not be used with
-d.
- -p port-num
- Work on port port-num (default 1). This option must be used with -i
and should not be used with -d.
- -d umad-device
- Use device file umad-device (default /dev/infiniband/umad0) This
option should not be used with -i or -p.
- -c
- Generate output suitable for piping directly to a
/sys/class/infiniband_srp/srp-<device>-<port>/add_target
file.
- -a
- Prints all the targets in the fabric, not only targets that are not
connected through the local port. (The same as ibsrpdm.)
- -e
- Execute the connection command, i.e., make the connection to the
target.
- -o
- Perform only one rescan and exit. (The same as ibsrpdm.)
- -R Rescan-time
- Force a complete rescan every Rescan-time seconds. If -R is not
specified, no timeout rescans will be performed.
- -T retry-Timeout
- Retries to connect to existing target after retry-Timeout seconds.
If -R is not specified, uses 5 Seconds timeout. if retry-Timeout is 0,
will not try to reconnect. The reason srp_daemon retries to connect to the
target is because there may be a rare scnerio in which srp_daemon will try
to connect to add a target when the target is about to be removed, but is
not removed yet.
- -f rules-File
- Decide to which targets to connect according to the rules in
rules-File. If -f is not specified, uses the default rules
file /etc/srp_daemon.conf. Each line in the rules-File is a rule
which can be either an allow connection or a disallow connection according
to the first character in the line (a or d accordingly). The rest of the
line is values for id_ext, ioc_guid, dgid, service_id. Please take a look
at the example section for an example of the file. srp_daemon decide
whether to allow or disallow each target according to first rule that
match the target. If no rule matches the target, the target is allowed and
will be connected. In an allow rule it is possible to set attributes for
the connection to the target. Supported attributes are max_cmd_per_lun and
max_sect.
- -t timeout
- Use timeout of timeout msec for MAD responses (default: 5
sec).
- -r retries
- Perform retries retries on each send to MAD (default: 3
retries).
- -n
- New format - use also initiator_ext in the connection command.
FILES¶
/etc/srp_daemon.conf - Default rules configuration file that indicates to which
targets to connect. Can be overridden using the
-f rules-File
option. Each line in this file is a rule which can be either an allow
connection or a disallow connection according to the first character in the
line (a or d accordingly). The rest of the line is values for id_ext,
ioc_guid, dgid, service_id. Please take a look at the example section for an
example of the file. srp_daemon decide whether to allow or disallow each
target according to first rule that match the target. If no rule matches the
target, the target is allowed and will be connected. In an allow rule it is
possible to set attributes for the connection to the target. Supported
attributes are max_cmd_per_lun and max_sect.
EXAMPLES¶
srp_daemon -e -i mthca0 -p 1 -R 60 (Connects to the targets accessible through
port 1 of mthca0. Performs a complete rescan every minute)
srp_daemon -o -c -a (Prints the connection commands for the targets in the
fabric and exits - similar to ibsrpdm)
srp_daemon -e -f rules.txt (Connects to the targets allowed in the rules file
rules.txt)
An example for a rules configuration file (such as /etc/srp_daemon.conf)
------------------------------------------------------------------------
# Rules file example
# This is a comment
# disallow the following dgid
d dgid=fe800000000000000002c90200402bd5
# allow target with the following ioc_guid
a ioc_guid=00a0b80200402bd7
# allow target with the following id_ext and ioc_guid. And setting max_cmd_per_lun to 31.
a id_ext=200500A0B81146A1,ioc_guid=00a0b80200402bef,max_cmd_per_lun=31
# disallow all the rest
d
SEE ALSO¶
ibsrpdm(1)
AUTHORS¶
- Roland Dreier
- <rolandd@cisco.com>
- Ishai Rabinovitz
- <ishai@mellanox.co.il>