aoe: update documentation to better reflect aoe-plus-udev usage

Signed-off-by: Ed Cashin <ecashin@coraid.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 32 insertions, 17 deletions

diff --git a/Documentation/aoe/aoe.txt b/Documentation/aoe/aoe.txt
index b3e47560346..bfc9cb19abc 100644
--- a/Documentation/aoe/aoe.txt
+++ b/Documentation/aoe/aoe.txt
@@ -1,3 +1,8 @@
+ATA over Ethernet is a network protocol that provides simple access to
+block storage on the LAN.
+
+  http://support.coraid.com/documents/AoEr11.txt
+
 The EtherDrive (R) HOWTO for 2.6 and 3.x kernels is found at ...
 
   http://support.coraid.com/support/linux/EtherDrive-2.6-HOWTO.html
@@ -26,20 +31,12 @@ CREATING DEVICE NODES
   There is a udev-install.sh script that shows how to install these
   rules on your system.
 
-  If you are not using udev, two scripts are provided in
-  Documentation/aoe as examples of static device node creation for
-  using the aoe driver.
-
-    rm -rf /dev/etherd
-    sh Documentation/aoe/mkdevs.sh /dev/etherd
-
-  ... or to make just one shelf's worth of block device nodes ...
-
-    sh Documentation/aoe/mkshelf.sh /dev/etherd 0
-
   There is also an autoload script that shows how to edit
   /etc/modprobe.d/aoe.conf to ensure that the aoe module is loaded when
-  necessary.
+  necessary.  Preloading the aoe module is preferable to autoloading,
+  however, because AoE discovery takes a few seconds.  It can be
+  confusing when an AoE device is not present the first time the a
+  command is run but appears a second later.
 
 USING DEVICE NODES
 
@@ -54,9 +51,9 @@ USING DEVICE NODES
   "echo > /dev/etherd/discover" tells the driver to find out what AoE
   devices are available.
 
-  These character devices may disappear and be replaced by sysfs
-  counterparts.  Using the commands in aoetools insulates users from
-  these implementation details.
+  In the future these character devices may disappear and be replaced
+  by sysfs counterparts.  Using the commands in aoetools insulates
+  users from these implementation details.
 
   The block devices are named like this:
 
@@ -79,8 +76,8 @@ USING SYSFS
   The netif attribute is the network interface on the localhost
   through which we are communicating with the remote AoE device.
 
-  There is a script in this directory that formats this information
-  in a convenient way.  Users with aoetools can use the aoe-stat
+  There is a script in this directory that formats this information in
+  a convenient way.  Users with aoetools should use the aoe-stat
   command.
 
   root@makki root# sh Documentation/aoe/status.sh 
@@ -124,3 +121,21 @@ DRIVER OPTIONS
   usage example for the module parameter.
 
     modprobe aoe_iflist="eth1 eth3"
+
+  The aoe_deadsecs module parameter determines the maximum number of
+  seconds that the driver will wait for an AoE device to provide a
+  response to an AoE command.  After aoe_deadsecs seconds have
+  elapsed, the AoE device will be marked as "down".
+
+  The aoe_maxout module parameter has a default of 128.  This is the
+  maximum number of unresponded packets that will be sent to an AoE
+  target at one time.
+
+  The aoe_dyndevs module parameter defaults to 1, meaning that the
+  driver will assign a block device minor number to a discovered AoE
+  target based on the order of its discovery.  With dynamic minor
+  device numbers in use, a greater range of AoE shelf and slot
+  addresses can be supported.  Users with udev will never have to
+  think about minor numbers.  Using aoe_dyndevs=0 allows device nodes
+  to be pre-created using a static minor-number scheme with the
+  aoe-mkshelf script in the aoetools.