From: Bart Van Assche <bvanassche@acm.org>
Date: Wed, 11 Dec 2013 16:08:43 +0000 (+0100)
Subject: scsi_transport_srp: Add rport state diagram
X-Git-Tag: v3.14-rc1~103^2~1^10~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=31b90347dc9fb7649a8dc3ffefa52771ac30e10b;p=pandora-kernel.git

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>
---

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()" ];
+}