linux-kernel - [PATCH 01 of 33] IB/ipath - add ability to set and clear IB local loopback

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Date:	Thu, 15 Mar 2007 14:44:45 -0700
From:	Bryan O'Sullivan <bos@...hscale.com>
To:	rdreier@...co.com
Cc:	openib-general@...nfabrics.org, linux-kernel@...r.kernel.org
Subject: [PATCH 01 of 33] IB/ipath - add ability to set and clear IB local
	loopback

# HG changeset patch
# User Bryan O'Sullivan <bos@...hscale.com>
# Date 1173994464 25200
# Node ID b1d05f3486f8bba1dd3c5cbca39f06a5e1b3d6fb
# Parent  0d37971d4ab0c8b6f7a8f6e8222112321982498f
IB/ipath - add ability to set and clear IB local loopback

This is a sticky state.  It is useful for diagnosing problems with boards
versus cable/switch problems.

Signed-off-by: Dave Olson <dave.olson@...gic.com>
Signed-off-by: Bryan O'Sullivan <bryan.osullivan@...gic.com>

diff -r 0d37971d4ab0 -r b1d05f3486f8 drivers/infiniband/hw/ipath/ipath_common.h
--- a/drivers/infiniband/hw/ipath/ipath_common.h	Wed Mar 14 17:53:43 2007 -0700
+++ b/drivers/infiniband/hw/ipath/ipath_common.h	Thu Mar 15 14:34:24 2007 -0700
@@ -78,6 +78,8 @@
 #define IPATH_IB_LINKINIT		3
 #define IPATH_IB_LINKDOWN_SLEEP		4
 #define IPATH_IB_LINKDOWN_DISABLE	5
+#define IPATH_IB_LINK_LOOPBACK	6 /* enable local loopback */
+#define IPATH_IB_LINK_EXTERNAL	7 /* normal, disable local loopback */
 
 /*
  * stats maintained by the driver.  For now, at least, this is global
diff -r 0d37971d4ab0 -r b1d05f3486f8 drivers/infiniband/hw/ipath/ipath_driver.c
--- a/drivers/infiniband/hw/ipath/ipath_driver.c	Wed Mar 14 17:53:43 2007 -0700
+++ b/drivers/infiniband/hw/ipath/ipath_driver.c	Thu Mar 15 14:34:24 2007 -0700
@@ -1662,6 +1662,22 @@ int ipath_set_linkstate(struct ipath_dev
 		lstate = IPATH_LINKACTIVE;
 		break;
 
+	case IPATH_IB_LINK_LOOPBACK:
+		dev_info(&dd->pcidev->dev, "Enabling IB local loopback\n");
+		dd->ipath_ibcctrl |= INFINIPATH_IBCC_LOOPBACK;
+		ipath_write_kreg(dd, dd->ipath_kregs->kr_ibcctrl,
+				 dd->ipath_ibcctrl);
+		ret = 0;
+		goto bail; // no state change to wait for
+
+	case IPATH_IB_LINK_EXTERNAL:
+		dev_info(&dd->pcidev->dev, "Disabling IB local loopback (normal)\n");
+		dd->ipath_ibcctrl &= ~INFINIPATH_IBCC_LOOPBACK;
+		ipath_write_kreg(dd, dd->ipath_kregs->kr_ibcctrl,
+				 dd->ipath_ibcctrl);
+		ret = 0;
+		goto bail; // no state change to wait for
+
 	default:
 		ipath_dbg("Invalid linkstate 0x%x requested\n", newstate);
 		ret = -EINVAL;
-
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