aoe: module parameter for device timeout

The aoe_deadsecs module parameter sets the number of seconds that
elapse before a nonresponsive AoE device is marked as dead.

This is runtime settable in sysfs or settable with a module load or
kernel boot parameter.

Signed-off-by: "Ed L. Cashin" <ecashin@coraid.com>
Acked-by: Alan Cox <alan@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/block/aoe/aoecmd.c b/drivers/block/aoe/aoecmd.c
index 9ebc98a..f2b8f55 100644 (file)
--- a/drivers/block/aoe/aoecmd.c
+++ b/drivers/block/aoe/aoecmd.c
@@ -15,7 +15,10 @@
 #define TIMERTICK (HZ / 10)
 #define MINTIMER (2 * TIMERTICK)
 #define MAXTIMER (HZ << 1)
-#define MAXWAIT (60 * 3)       /* After MAXWAIT seconds, give up and fail dev */
+
+static int aoe_deadsecs = 60 * 3;
+module_param(aoe_deadsecs, int, 0644);
+MODULE_PARM_DESC(aoe_deadsecs, "After aoe_deadsecs seconds, give up and fail dev.");
 
 struct sk_buff *
 new_skb(ulong len)
@@ -373,7 +376,7 @@ rexmit_timer(ulong vp)
                if (f->tag != FREETAG && tsince(f->tag) >= timeout) {
                        n = f->waited += timeout;
                        n /= HZ;
-                       if (n > MAXWAIT) { /* waited too long.  device failure. */
+                       if (n > aoe_deadsecs) { /* waited too long for response */
                                aoedev_downdev(d);
                                break;
                        }