SRP_DAEMON(8)

NAME
srp_daemon - Discovers SRP targets in an InfiniBand Fabric

SYNOPSIS
srp_daemon [-vVcaeon] [-d umad-device | -i infiniband-device [-p port-num] | -j dev:port] [-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 and 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 an SRP target. When there is a change of capabilities, srp_daemon checks if the machine has turned into an SRP 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 (the 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 nor with -j.

-p port-num
    Work on port port-num (default 1). This option must be used with -i and should not be used with -d nor with -j.

-j dev:port
    Work on port number port of InfiniBand device dev. This option should not be used with -d, -i nor with -p.

-d umad-device
    Use device file umad-device (default /dev/infiniband/umad0) This option should not be used with -i, -p nor with -j.

-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. This is the same behavior as that of ibsrpdm.

-e  Execute the connection command, i.e., make the connection to the target.

-o  Perform only one rescan and exit just like 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.

--systemd
    Enable systemd integration.

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>