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authorBart Van Assche <bvanassche@acm.org>2013-12-11 17:08:43 +0100
committerRoland Dreier <roland@purestorage.com>2014-01-21 10:46:17 -0800
commit31b90347dc9fb7649a8dc3ffefa52771ac30e10b (patch)
tree644fce867ee0e85d4d9ec8e77713ad212c5c3345 /Documentation/scsi
parent93079162bf0ed2934c7b0c3ee93ba894df8fb3cd (diff)
scsi_transport_srp: Add rport state diagram
Add a diagram in Documentation/scsi/scsi_transport_srp that illustrates the rport state transitions. Signed-off-by: Bart Van Assche <bvanassche@acm.org> Signed-off-by: Roland Dreier <roland@purestorage.com>
Diffstat (limited to 'Documentation/scsi')
-rw-r--r--Documentation/scsi/scsi_transport_srp/Makefile7
-rw-r--r--Documentation/scsi/scsi_transport_srp/rport_state_diagram.dot26
2 files changed, 33 insertions, 0 deletions
diff --git a/Documentation/scsi/scsi_transport_srp/Makefile b/Documentation/scsi/scsi_transport_srp/Makefile
new file mode 100644
index 000000000000..5f6b567e955c
--- /dev/null
+++ b/Documentation/scsi/scsi_transport_srp/Makefile
@@ -0,0 +1,7 @@
+all: rport_state_diagram.svg rport_state_diagram.png
+
+rport_state_diagram.svg: rport_state_diagram.dot
+ dot -Tsvg -o $@ $<
+
+rport_state_diagram.png: rport_state_diagram.dot
+ dot -Tpng -o $@ $<
diff --git a/Documentation/scsi/scsi_transport_srp/rport_state_diagram.dot b/Documentation/scsi/scsi_transport_srp/rport_state_diagram.dot
new file mode 100644
index 000000000000..75d610d6411a
--- /dev/null
+++ b/Documentation/scsi/scsi_transport_srp/rport_state_diagram.dot
@@ -0,0 +1,26 @@
+digraph srp_initiator {
+ node [shape = doublecircle]; running lost;
+ node [shape = circle];
+
+ {
+ rank = min;
+ running_rta [ label = "running;\nreconnect\ntimer\nactive" ];
+ };
+ running [ label = "running;\nreconnect\ntimer\nstopped" ];
+ blocked;
+ failfast [ label = "fail I/O\nfast" ];
+ lost;
+
+ running -> running_rta [ label = "fast_io_fail_tmo = off and\ndev_loss_tmo = off;\nsrp_start_tl_fail_timers()" ];
+ running_rta -> running [ label = "fast_io_fail_tmo = off and\ndev_loss_tmo = off;\nreconnecting succeeded" ];
+ running -> blocked [ label = "fast_io_fail_tmo >= 0 or\ndev_loss_tmo >= 0;\nsrp_start_tl_fail_timers()" ];
+ running -> failfast [ label = "fast_io_fail_tmo = off and\ndev_loss_tmo = off;\nreconnecting failed\n" ];
+ blocked -> failfast [ label = "fast_io_fail_tmo\nexpired or\nreconnecting\nfailed" ];
+ blocked -> lost [ label = "dev_loss_tmo\nexpired or\nsrp_stop_rport_timers()" ];
+ failfast -> lost [ label = "dev_loss_tmo\nexpired or\nsrp_stop_rport_timers()" ];
+ blocked -> running [ label = "reconnecting\nsucceeded" ];
+ failfast -> failfast [ label = "reconnecting\nfailed" ];
+ failfast -> running [ label = "reconnecting\nsucceeded" ];
+ running -> lost [ label = "srp_stop_rport_timers()" ];
+ running_rta -> lost [ label = "srp_stop_rport_timers()" ];
+}

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