path: root/drivers/infiniband/hw/ipath/ipath_mad.c

/*
 * Copyright (c) 2006 QLogic, Inc. All rights reserved.
 * Copyright (c) 2005, 2006 PathScale, Inc. All rights reserved.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * OpenIB.org BSD license below:
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *      - Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer.
 *
 *      - Redistributions in binary form must reproduce the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer in the documentation and/or other materials
 *        provided with the distribution.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#include <rdma/ib_smi.h>

#include "ipath_kernel.h"
#include "ipath_verbs.h"
#include "ipath_common.h"

#define IB_SMP_UNSUP_VERSION	__constant_htons(0x0004)
#define IB_SMP_UNSUP_METHOD	__constant_htons(0x0008)
#define IB_SMP_UNSUP_METH_ATTR	__constant_htons(0x000C)
#define IB_SMP_INVALID_FIELD	__constant_htons(0x001C)

static int reply(struct ib_smp *smp)
{
	/*
	 * The verbs framework will handle the directed/LID route
	 * packet changes.
	 */
	smp->method = IB_MGMT_METHOD_GET_RESP;
	if (smp->mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
		smp->status |= IB_SMP_DIRECTION;
	return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY;
}

static int recv_subn_get_nodedescription(struct ib_smp *smp,
					 struct ib_device *ibdev)
{
	if (smp->attr_mod)
		smp->status |= IB_SMP_INVALID_FIELD;

	strncpy(smp->data, ibdev->node_desc, sizeof(smp->data));

	return reply(smp);
}

struct nodeinfo {
	u8 base_version;
	u8 class_version;
	u8 node_type;
	u8 num_ports;
	__be64 sys_guid;
	__be64 node_guid;
	__be64 port_guid;
	__be16 partition_cap;
	__be16 device_id;
	__be32 revision;
	u8 local_port_num;
	u8 vendor_id[3];
} __attribute__ ((packed));

static int recv_subn_get_nodeinfo(struct ib_smp *smp,
				  struct ib_device *ibdev, u8 port)
{
	struct nodeinfo *nip = (struct nodeinfo *)&smp->data;
	struct ipath_devdata *dd = to_idev(ibdev)->dd;
	u32 vendor, majrev, minrev;

	/* GUID 0 is illegal */
	if (smp->attr_mod || (dd->ipath_guid == 0))
		smp->status |= IB_SMP_INVALID_FIELD;

	nip->base_version = 1;
	nip->class_version = 1;
	nip->node_type = 1;	/* channel adapter */
	/*
	 * XXX The num_ports value will need a layer function to get
	 * the value if we ever have more than one IB port on a chip.
	 * We will also need to get the GUID for the port.
	 */
	nip->num_ports = ibdev->phys_port_cnt;
	/* This is already in network order */
	nip->sys_guid = to_idev(ibdev)->sys_image_guid;
	nip->node_guid = dd->ipath_guid;
	nip->port_guid = nip->sys_guid;
	nip->partition_cap = cpu_to_be16(ipath_get_npkeys(dd));
	nip->device_id = cpu_to_be16(dd->ipath_deviceid);
	majrev = dd->ipath_majrev;
	minrev = dd->ipath_minrev;
	nip->revision = cpu_to_be32((majrev << 16) | minrev);
	nip->local_port_num = port;
	vendor = dd->ipath_vendorid;
	nip->vendor_id[0] = 0;
	nip->vendor_id[1] = vendor >> 8;
	nip->vendor_id[2] = vendor;

	return reply(smp);
}

static int recv_subn_get_guidinfo(struct ib_smp *smp,
				  struct ib_device *ibdev)
{
	u32 startgx = 8 * be32_to_cpu(smp->attr_mod);
	__be64 *p = (__be64 *) smp->data;

	/* 32 blocks of 8 64-bit GUIDs per block */

	memset(smp->data, 0, sizeof(smp->data));

	/*
	 * We only support one GUID for now.  If this changes, the
	 * portinfo.guid_cap field needs to be updated too.
	 */
	if (startgx == 0) {
		__be64 g = to_idev(ibdev)->dd->ipath_guid;
		if (g == 0)
			/* GUID 0 is illegal */
			smp->status |= IB_SMP_INVALID_FIELD;
		else
			/* The first is a copy of the read-only HW GUID. */
			*p = g;
	} else
		smp->status |= IB_SMP_INVALID_FIELD;

	return reply(smp);
}


static int get_overrunthreshold(struct ipath_devdata *dd)
{
	return (dd->ipath_ibcctrl >>
		INFINIPATH_IBCC_OVERRUNTHRESHOLD_SHIFT) &
		INFINIPATH_IBCC_OVERRUNTHRESHOLD_MASK;
}

/**
 * set_overrunthreshold - set the overrun threshold
 * @dd: the infinipath device
 * @n: the new threshold
 *
 * Note that this will only take effect when the link state changes.
 */
static int set_overrunthreshold(struct ipath_devdata *dd, unsigned n)
{
	unsigned v;

	v = (dd->ipath_ibcctrl >> INFINIPATH_IBCC_OVERRUNTHRESHOLD_SHIFT) &
		INFINIPATH_IBCC_OVERRUNTHRESHOLD_MASK;
	if (v != n) {
		dd->ipath_ibcctrl &=
			~(INFINIPATH_IBCC_OVERRUNTHRESHOLD_MASK <<
			  INFINIPATH_IBCC_OVERRUNTHRESHOLD_SHIFT);
		dd->ipath_ibcctrl |=
			(u64) n << INFINIPATH_IBCC_OVERRUNTHRESHOL