sa_query.c

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/*
 * Copyright (c) 2004 Topspin Communications.  All rights reserved.
 * Copyright (c) 2005 Voltaire, Inc.  All rights reserved.
 * Copyright (c) 2006 Intel Corporation.  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.
 *
 * $Id: sa_query.c 2811 2005-07-06 18:11:43Z halr $
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/err.h>
#include <linux/random.h>
#include <linux/spinlock.h>
#include <linux/slab.h>
#include <linux/dma-mapping.h>
#include <linux/kref.h>
#include <linux/idr.h>
#include <linux/workqueue.h>

#include <rdma/ib_pack.h>
#include <rdma/ib_cache.h>
#include "sa.h"

MODULE_AUTHOR("Roland Dreier");
MODULE_DESCRIPTION("InfiniBand subnet administration query support");
MODULE_LICENSE("Dual BSD/GPL");

struct ib_sa_sm_ah {
	struct ib_ah        *ah;
	struct kref          ref;
	u16		     pkey_index;
	u8		     src_path_mask;
};

struct ib_sa_port {
	struct ib_mad_agent *agent;
	struct ib_sa_sm_ah  *sm_ah;
	struct work_struct   update_task;
	spinlock_t           ah_lock;
	u8                   port_num;
};

struct ib_sa_device {
	int                     start_port, end_port;
	struct ib_event_handler event_handler;
	struct ib_sa_port port[0];
};

struct ib_sa_query {
	void (*callback)(struct ib_sa_query *, int, struct ib_sa_mad *);
	void (*release)(struct ib_sa_query *);
	struct ib_sa_client    *client;
	struct ib_sa_port      *port;
	struct ib_mad_send_buf *mad_buf;
	struct ib_sa_sm_ah     *sm_ah;
	int			id;
};

struct ib_sa_service_query {
	void (*callback)(int, struct ib_sa_service_rec *, void *);
	void *context;
	struct ib_sa_query sa_query;
};

struct ib_sa_path_query {
	void (*callback)(int, struct ib_sa_path_rec *, void *);
	void *context;
	struct ib_sa_query sa_query;
};

struct ib_sa_mcmember_query {
	void (*callback)(int, struct ib_sa_mcmember_rec *, void *);
	void *context;
	struct ib_sa_query sa_query;
};

static void ib_sa_add_one(struct ib_device *device);
static void ib_sa_remove_one(struct ib_device *device);

static struct ib_client sa_client = {
	.name   = "sa",
	.add    = ib_sa_add_one,
	.remove = ib_sa_remove_one
};

static spinlock_t idr_lock;
static DEFINE_IDR(query_idr);

static spinlock_t tid_lock;
static u32 tid;

#define PATH_REC_FIELD(field) \
	.struct_offset_bytes = offsetof(struct ib_sa_path_rec, field),		\
	.struct_size_bytes   = sizeof ((struct ib_sa_path_rec *) 0)->field,	\
	.field_name          = "sa_path_rec:" #field

static const struct ib_field path_rec_table[] = {
	{ PATH_REC_FIELD(service_id),
	  .offset_words = 0,
	  .offset_bits  = 0,
	  .size_bits    = 64 },
	{ PATH_REC_FIELD(dgid),
	  .offset_words = 2,
	  .offset_bits  = 0,
	  .size_bits    = 128 },
	{ PATH_REC_FIELD(sgid),
	  .offset_words = 6,
	  .offset_bits  = 0,
	  .size_bits    = 128 },
	{ PATH_REC_FIELD(dlid),
	  .offset_words = 10,
	  .offset_bits  = 0,
	  .size_bits    = 16 },
	{ PATH_REC_FIELD(slid),
	  .offset_words = 10,
	  .offset_bits  = 16,
	  .size_bits    = 16 },
	{ PATH_REC_FIELD(raw_traffic),
	  .offset_words = 11,
	  .offset_bits  = 0,
	  .size_bits    = 1 },
	{ RESERVED,
	  .offset_words = 11,
	  .offset_bits  = 1,
	  .size_bits    = 3 },
	{ PATH_REC_FIELD(flow_label),
	  .offset_words = 11,
	  .offset_bits  = 4,
	  .size_bits    = 20 },
	{ PATH_REC_FIELD(hop_limit),
	  .offset_words = 11,
	  .offset_bits  = 24,
	  .size_bits    = 8 },
	{ PATH_REC_FIELD(traffic_class),
	  .offset_words = 12,
	  .offset_bits  = 0,
	  .size_bits    = 8 },
	{ PATH_REC_FIELD(reversible),
	  .offset_words = 12,
	  .offset_bits  = 8,
	  .size_bits    = 1 },
	{ PATH_REC_FIELD(numb_path),
	  .offset_words = 12,
	  .offset_bits  = 9,
	  .size_bits    = 7 },
	{ PATH_REC_FIELD(pkey),
	  .offset_words = 12,
	  .offset_bits  = 16,
	  .size_bits    = 16 },
	{ PATH_REC_FIELD(qos_class),
	  .offset_words = 13,
	  .offset_bits  = 0,
	  .size_bits    = 12 },
	{ PATH_REC_FIELD(sl),
	  .offset_words = 13,
	  .offset_bits  = 12,
	  .size_bits    = 4 },
	{ PATH_REC_FIELD(mtu_selector),
	  .offset_words = 13,
	  .offset_bits  = 16,
	  .size_bits    = 2 },
	{ PATH_REC_FIELD(mtu),
	  .offset_words = 13,
	  .offset_bits  = 18,
	  .size_bits    = 6 },
	{ PATH_REC_FIELD(rate_selector),
	  .offset_words = 13,
	  .offset_bits  = 24,
	  .size_bits    = 2 },
	{ PATH_REC_FIELD(rate),
	  .offset_words = 13,
	  .offset_bits  = 26,
	  .size_bits    = 6 },
	{ PATH_REC_FIELD(packet_life_time_selector),
	  .offset_words = 14,
	  .offset_bits  = 0,
	  .size_bits    = 2 },
	{ PATH_REC_FIELD(packet_life_time),
	  .offset_words = 14,
	  .offset_bits  = 2,
	  .size_bits    = 6 },
	{ PATH_REC_FIELD(preference),
	  .offset_words = 14,
	  .offset_bits  = 8,
	  .size_bits    = 8 },
	{ RESERVED,
	  .offset_words = 14,
	  .offset_bits  = 16,
	  .size_bits    = 48 },
};

#define MCMEMBER_REC_FIELD(field) \
	.struct_offset_bytes = offsetof(struct ib_sa_mcmember_rec, field),	\
	.struct_size_bytes   = sizeof ((struct ib_sa_mcmember_rec *) 0)->field,	\
	.field_name          = "sa_mcmember_rec:" #field

static const struct ib_field mcmember_rec_table[] = {
	{ MCMEMBER_REC_FIELD(mgid),
	  .offset_words = 0,
	  .offset_bits  = 0,
	  .size_bits    = 128 },
	{ MCMEMBER_REC_FIELD(port_gid),
	  .offset_words = 4,
	  .offset_bits  = 0,
	  .size_bits    = 128 },
	{ MCMEMBER_REC_FIELD(qkey),
	  .offset_words = 8,
	  .offset_bits  = 0,
	  .size_bits    = 32 },
	{ MCMEMBER_REC_FIELD(mlid),
	  .offset_words = 9,
	  .offset_bits  = 0,
	  .size_bits    = 16 },
	{ MCMEMBER_REC_FIELD(mtu_selector),
	  .offset_words = 9,
	  .offset_bits  = 16,
	  .size_bits    = 2 },
	{ MCMEMBER_REC_FIELD(mtu),
	  .offset_words = 9,
	  .offset_bits  = 18,
	  .size_bits    = 6 },
	{ MCMEMBER_REC_FIELD(traffic_class),
	  .offset_words = 9,
	  .offset_bits  = 24,
	  .size_bits    = 8 },
	{ MCMEMBER_REC_FIELD(pkey),
	  .offset_words = 10,
	  .offset_bits  = 0,
	  .size_bits    = 16 },
	{ MCMEMBER_REC_FIELD(rate_selector),
	  .offset_words = 10,
	  .offset_bits  = 16,
	  .size_bits    = 2 },
	{ MCMEMBER_REC_FIELD(rate),
	  .offset_words = 10,
	  .offset_bits  = 18,
	  .size_bits    = 6 },
	{ MCMEMBER_REC_FIELD(packet_life_time_selector),
	  .offset_words = 10,
	  .offset_bits  = 24,
	  .size_bits    = 2 },
	{ MCMEMBER_REC_FIELD(packet_life_time),
	  .offset_words = 10,
	  .offset_bits  = 26,
	  .size_bits    = 6 },
	{ MCMEMBER_REC_FIELD(sl),
	  .offset_words = 11,
	  .offset_bits  = 0,
	  .size_bits    = 4 },
	{ MCMEMBER_REC_FIELD(flow_label),
	  .offset_words = 11,
	  .offset_bits  = 4,
	  .size_bits    = 20 },
	{ MCMEMBER_REC_FIELD(hop_limit),
	  .offset_words = 11,
	  .offset_bits  = 24,
	  .size_bits    = 8 },
	{ MCMEMBER_REC_FIELD(scope),
	  .offset_words = 12,
	  .offset_bits  = 0,
	  .size_bits    = 4 },
	{ MCMEMBER_REC_FIELD(join_state),
	  .offset_words = 12,
	  .offset_bits  = 4,
	  .size_bits    = 4 },
	{ MCMEMBER_REC_FIELD(proxy_join),
	  .offset_words = 12,
	  .offset_bits  = 8,
	  .size_bits    = 1 },
	{ RESERVED,
	  .offset_words = 12,
	  .offset_bits  = 9,
	  .size_bits    = 23 },
};

#define SERVICE_REC_FIELD(field) \
	.struct_offset_bytes = offsetof(struct ib_sa_service_rec, field),	\
	.struct_size_bytes   = sizeof ((struct ib_sa_service_rec *) 0)->field,	\
	.field_name          = "sa_service_rec:" #field

static const struct ib_field service_rec_table[] = {
	{ SERVICE_REC_FIELD(id),
	  .offset_words = 0,
	  .offset_bits  = 0,
	  .size_bits    = 64 },
	{ SERVICE_REC_FIELD(gid),
	  .offset_words = 2,
	  .offset_bits  = 0,
	  .size_bits    = 128 },
	{ SERVICE_REC_FIELD(pkey),
	  .offset_words = 6,
	  .offset_bits  = 0,
	  .size_bits    = 16 },
	{ SERVICE_REC_FIELD(lease),
	  .offset_words = 7,
	  .offset_bits  = 0,
	  .size_bits    = 32 },
	{ SERVICE_REC_FIELD(key),
	  .offset_words = 8,
	  .offset_bits  = 0,
	  .size_bits    = 128 },
	{ SERVICE_REC_FIELD(name),
	  .offset_words = 12,
	  .offset_bits  = 0,
	  .size_bits    = 64*8 },
	{ SERVICE_REC_FIELD(data8),
	  .offset_words = 28,
	  .offset_bits  = 0,
	  .size_bits    = 16*8 },
	{ SERVICE_REC_FIELD(data16),
	  .offset_words = 32,
	  .offset_bits  = 0,
	  .size_bits    = 8*16 },
	{ SERVICE_REC_FIELD(data32),
	  .offset_words = 36,
	  .offset_bits  = 0,
	  .size_bits    = 4*32 },
	{ SERVICE_REC_FIELD(data64),
	  .offset_words = 40,
	  .offset_bits  = 0,
	  .size_bits    = 2*64 },
};

static void free_sm_ah(struct kref *kref)
{
	struct ib_sa_sm_ah *sm_ah = container_of(kref, struct ib_sa_sm_ah, ref);

	ib_destroy_ah(sm_ah->ah);
	kfree(sm_ah);
}

static void update_sm_ah(struct work_struct *work)
{
	struct ib_sa_port *port =
		container_of(work, struct ib_sa_port, update_task);
	struct ib_sa_sm_ah *new_ah, *old_ah;
	struct ib_port_attr port_attr;
	struct ib_ah_attr   ah_attr;

	if (ib_query_port(port->agent->device, port->port_num, &port_attr)) {
		printk(KERN_WARNING "Couldn't query port\n");
		return;
	}

	new_ah = kmalloc(sizeof *new_ah, GFP_KERNEL);
	if (!new_ah) {
		printk(KERN_WARNING "Couldn't allocate new SM AH\n");
		return;
	}

	kref_init(&new_ah->ref);
	new_ah->src_path_mask = (1 << port_attr.lmc) - 1;

	new_ah->pkey_index = 0;
	if (ib_find_pkey(port->agent->device, port->port_num,
			 IB_DEFAULT_PKEY_FULL, &new_ah->pkey_index))
		printk(KERN_ERR "Couldn't find index for default PKey\n");

	memset(&ah_attr, 0, sizeof ah_attr);
	ah_attr.dlid     = port_attr.sm_lid;
	ah_attr.sl       = port_attr.sm_sl;
	ah_attr.port_num = port->port_num;

	new_ah->ah = ib_create_ah(port->agent->qp->pd, &ah_attr);
	if (IS_ERR(new_ah->ah)) {
		printk(KERN_WARNING "Couldn't create new SM AH\n");
		kfree(new_ah);
		return;
	}

	spin_lock_irq(&port->ah_lock);
	old_ah = port->sm_ah;
	port->sm_ah = new_ah;
	spin_unlock_irq(&port->ah_lock);

	if (old_ah)
		kref_put(&old_ah->ref, free_sm_ah);
}

static void ib_sa_event(struct ib_event_handler *handler, struct ib_event *event)
{
	if (event->event == IB_EVENT_PORT_ERR    ||
	    event->event == IB_EVENT_PORT_ACTIVE ||
	    event->event == IB_EVENT_LID_CHANGE  ||
	    event->event == IB_EVENT_PKEY_CHANGE ||
	    event->event == IB_EVENT_SM_CHANGE   ||
	    event->event == IB_EVENT_CLIENT_REREGISTER) {
		struct ib_sa_device *sa_dev;
		sa_dev = container_of(handler, typeof(*sa_dev), event_handler);

		schedule_work(&sa_dev->port[event->element.port_num -
					    sa_dev->start_port].update_task);
	}
}

void ib_sa_register_client(struct ib_sa_client *client)
{
	atomic_set(&client->users, 1);
	init_completion(&client->comp);
}
EXPORT_SYMBOL(ib_sa_register_client);

void ib_sa_unregister_client(struct ib_sa_client *client)
{
	ib_sa_client_put(client);
	wait_for_completion(&client->comp);
}
EXPORT_SYMBOL(ib_sa_unregister_client);

/**
 * ib_sa_cancel_query - try to cancel an SA query
 * @id:ID of query to cancel
 * @query:query pointer to cancel
 *
 * Try to cancel an SA query.  If the id and query don't match up or
 * the query has already completed, nothing is done.  Otherwise the
 * query is canceled and will complete with a status of -EINTR.
 */
void ib_sa_cancel_query(int id, struct ib_sa_query *query)
{
	unsigned long flags;
	struct ib_mad_agent *agent;
	struct ib_mad_send_buf *mad_buf;

	spin_lock_irqsave(&idr_lock, flags);
	if (idr_find(&query_idr, id) != query) {
		spin_unlock_irqrestore(&idr_lock, flags);
		return;
	}
	agent = query->port->agent;
	mad_buf = query->mad_buf;
	spin_unlock_irqrestore(&idr_lock, flags);

	ib_cancel_mad(agent, mad_buf);
}
EXPORT_SYMBOL(ib_sa_cancel_query);

static u8 get_src_path_mask(struct ib_device *device, u8 port_num)
{
	struct ib_sa_device *sa_dev;
	struct ib_sa_port   *port;
	unsigned long flags;
	u8 src_path_mask;

	sa_dev = ib_get_client_data(device, &sa_client);
	if (!sa_dev)
		return 0x7f;

	port  = &sa_dev->port[port_num - sa_dev->start_port];
	spin_lock_irqsave(&port->ah_lock, flags);
	src_path_mask = port->sm_ah ? port->sm_ah->src_path_mask : 0x7f;
	spin_unlock_irqrestore(&port->ah_lock, flags);

	return src_path_mask;
}

int ib_init_ah_from_path(struct ib_device *device, u8 port_num,
			 struct ib_sa_path_rec *rec, struct ib_ah_attr *ah_attr)
{
	int ret;
	u16 gid_index;

	memset(ah_attr, 0, sizeof *ah_attr);
	ah_attr->dlid = be16_to_cpu(rec->dlid);
	ah_attr->sl = rec->sl;
	ah_attr->src_path_bits = be16_to_cpu(rec->slid) &
				 get_src_path_mask(device, port_num);
	ah_attr->port_num = port_num;
	ah_attr->static_rate = rec->rate;

	if (rec->hop_limit > 1) {
		ah_attr->ah_flags = IB_AH_GRH;
		ah_attr->grh.dgid = rec->dgid;

		ret = ib_find_cached_gid(device, &rec->sgid, &port_num,
					 &gid_index);
		if (ret)
			return ret;

		ah_attr->grh.sgid_index    = gid_index;
		ah_attr->grh.flow_label    = be32_to_cpu(rec->flow_label);
		ah_attr->grh.hop_limit     = rec->hop_limit;
		ah_attr->grh.traffic_class = rec->traffic_class;
	}
	return 0;
}
EXPORT_SYMBOL(ib_init_ah_from_path);

static int alloc_mad(struct ib_sa_query *query, gfp_t gfp_mask)
{
	unsigned long flags;

	spin_lock_irqsave(&query->port->ah_lock, flags);
	kref_get(&query->port->sm_ah->ref);
	query->sm_ah = query->port->sm_ah;
	spin_unlock_irqrestore(&query->port->ah_lock, flags);

	query->mad_buf = ib_create_send_mad(query->port->agent, 1,
					    query->sm_ah->pkey_index,
					    0, IB_MGMT_SA_HDR, IB_MGMT_SA_DATA,
					    gfp_mask);
	if (IS_ERR(query->mad_buf)) {
		kref_put(&query->sm_ah->ref, free_sm_ah);
		return -ENOMEM;
	}

	query->mad_buf->ah = query->sm_ah->ah;

	return 0;
}

static void free_mad(struct ib_sa_query *query)
{
	ib_free_send_mad(query->mad_buf);
	kref_put(&query->sm_ah->ref, free_sm_ah);
}

static void init_mad(struct ib_sa_mad *mad, struct ib_mad_agent *agent)
{
	unsigned long flags;

	memset(mad, 0, sizeof *mad);