Commit 946db67f authored by Bryan O'Sullivan's avatar Bryan O'Sullivan Committed by Roland Dreier
Browse files

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: default avatarDave Olson <dave.olson@qlogic.com>
Signed-off-by: default avatarBryan O'Sullivan <bryan.osullivan@qlogic.com>
Signed-off-by: default avatarRoland Dreier <rolandd@cisco.com>
parent a89875fc

drivers/infiniband/hw/ipath/ipath_common.h

+2 −0
Original line number Diff line number Diff line
@@ -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

drivers/infiniband/hw/ipath/ipath_driver.c

+16 −0
Original line number Diff line number Diff line
@@ -1662,6 +1662,22 @@ int ipath_set_linkstate(struct ipath_devdata *dd, u8 newstate) 
		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;