29c1732480
Add the necessary functions in the SRP transport module to allow an SRP initiator driver to implement transport layer error handling similar to the functionality already provided by the FC transport layer. This includes: - Support for implementing fast_io_fail_tmo, the time that should elapse after having detected a transport layer problem and before failing I/O. - Support for implementing dev_loss_tmo, the time that should elapse after having detected a transport layer problem and before removing a remote port. Signed-off-by: Bart Van Assche <bvanassche@acm.org> Acked-by: David Dillow <dillowda@ornl.gov> Signed-off-by: Roland Dreier <roland@purestorage.com>
51 lines
2.1 KiB
Plaintext
51 lines
2.1 KiB
Plaintext
What: /sys/class/srp_remote_ports/port-<h>:<n>/delete
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Date: June 1, 2012
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KernelVersion: 3.7
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Contact: linux-scsi@vger.kernel.org, linux-rdma@vger.kernel.org
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Description: Instructs an SRP initiator to disconnect from a target and to
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remove all LUNs imported from that target.
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What: /sys/class/srp_remote_ports/port-<h>:<n>/dev_loss_tmo
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Date: February 1, 2014
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KernelVersion: 3.13
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Contact: linux-scsi@vger.kernel.org, linux-rdma@vger.kernel.org
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Description: Number of seconds the SCSI layer will wait after a transport
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layer error has been observed before removing a target port.
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Zero means immediate removal. Setting this attribute to "off"
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will disable the dev_loss timer.
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What: /sys/class/srp_remote_ports/port-<h>:<n>/fast_io_fail_tmo
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Date: February 1, 2014
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KernelVersion: 3.13
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Contact: linux-scsi@vger.kernel.org, linux-rdma@vger.kernel.org
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Description: Number of seconds the SCSI layer will wait after a transport
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layer error has been observed before failing I/O. Zero means
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failing I/O immediately. Setting this attribute to "off" will
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disable the fast_io_fail timer.
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What: /sys/class/srp_remote_ports/port-<h>:<n>/port_id
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Date: June 27, 2007
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KernelVersion: 2.6.24
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Contact: linux-scsi@vger.kernel.org
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Description: 16-byte local SRP port identifier in hexadecimal format. An
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example: 4c:49:4e:55:58:20:56:49:4f:00:00:00:00:00:00:00.
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What: /sys/class/srp_remote_ports/port-<h>:<n>/roles
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Date: June 27, 2007
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KernelVersion: 2.6.24
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Contact: linux-scsi@vger.kernel.org
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Description: Role of the remote port. Either "SRP Initiator" or "SRP Target".
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What: /sys/class/srp_remote_ports/port-<h>:<n>/state
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Date: February 1, 2014
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KernelVersion: 3.13
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Contact: linux-scsi@vger.kernel.org, linux-rdma@vger.kernel.org
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Description: State of the transport layer used for communication with the
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remote port. "running" if the transport layer is operational;
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"blocked" if a transport layer error has been encountered but
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the fast_io_fail_tmo timer has not yet fired; "fail-fast"
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after the fast_io_fail_tmo timer has fired and before the
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"dev_loss_tmo" timer has fired; "lost" after the
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"dev_loss_tmo" timer has fired and before the port is finally
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removed.
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