ark1668ed-bsp/linux/drivers/infiniband/core/sa_query.c

/*
 * 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.
 */

#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/xarray.h>
#include <linux/workqueue.h>
#include <uapi/linux/if_ether.h>
#include <rdma/ib_pack.h>
#include <rdma/ib_cache.h>
#include <rdma/rdma_netlink.h>
#include <net/netlink.h>
#include <uapi/rdma/ib_user_sa.h>
#include <rdma/ib_marshall.h>
#include <rdma/ib_addr.h>
#include <rdma/opa_addr.h>
#include <rdma/rdma_cm.h>
#include "sa.h"
#include "core_priv.h"

#define IB_SA_LOCAL_SVC_TIMEOUT_MIN		100
#define IB_SA_LOCAL_SVC_TIMEOUT_DEFAULT		2000
#define IB_SA_LOCAL_SVC_TIMEOUT_MAX		200000
#define IB_SA_CPI_MAX_RETRY_CNT			3
#define IB_SA_CPI_RETRY_WAIT			1000 /*msecs */
static int sa_local_svc_timeout_ms = IB_SA_LOCAL_SVC_TIMEOUT_DEFAULT;

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

enum rdma_class_port_info_type {
	RDMA_CLASS_PORT_INFO_IB,
	RDMA_CLASS_PORT_INFO_OPA
};

struct rdma_class_port_info {
	enum rdma_class_port_info_type type;
	union {
		struct ib_class_port_info ib;
		struct opa_class_port_info opa;
	};
};

struct ib_sa_classport_cache {
	bool valid;
	int retry_cnt;
	struct rdma_class_port_info data;
};

struct ib_sa_port {
	struct ib_mad_agent *agent;
	struct ib_sa_sm_ah  *sm_ah;
	struct work_struct   update_task;
	struct ib_sa_classport_cache classport_info;
	struct delayed_work ib_cpi_work;
	spinlock_t                   classport_lock; /* protects class port info set */
	spinlock_t           ah_lock;
	u32		     port_num;
};

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

struct ib_sa_query {
	void (*callback)(struct ib_sa_query *sa_query, int status,
			 struct ib_sa_mad *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;
	u32			flags;
	struct list_head	list; /* Local svc request list */
	u32			seq; /* Local svc request sequence number */
	unsigned long		timeout; /* Local svc timeout */
	u8			path_use; /* How will the pathrecord be used */
};

#define IB_SA_ENABLE_LOCAL_SERVICE	0x00000001
#define IB_SA_CANCEL			0x00000002
#define IB_SA_QUERY_OPA			0x00000004

struct ib_sa_path_query {
	void (*callback)(int status, struct sa_path_rec *rec,
			 unsigned int num_paths, void *context);
	void *context;
	struct ib_sa_query sa_query;
	struct sa_path_rec *conv_pr;
};

struct ib_sa_guidinfo_query {
	void (*callback)(int, struct ib_sa_guidinfo_rec *, void *);
	void *context;
	struct ib_sa_query sa_query;
};

struct ib_sa_classport_info_query {
	void (*callback)(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 LIST_HEAD(ib_nl_request_list);
static DEFINE_SPINLOCK(ib_nl_request_lock);
static atomic_t ib_nl_sa_request_seq;
static struct workqueue_struct *ib_nl_wq;
static struct delayed_work ib_nl_timed_work;
static const struct nla_policy ib_nl_policy[LS_NLA_TYPE_MAX] = {
	[LS_NLA_TYPE_PATH_RECORD]	= {.type = NLA_BINARY,
		.len = sizeof(struct ib_path_rec_data)},
	[LS_NLA_TYPE_TIMEOUT]		= {.type = NLA_U32},
	[LS_NLA_TYPE_SERVICE_ID]	= {.type = NLA_U64},
	[LS_NLA_TYPE_DGID]		= {.type = NLA_BINARY,
		.len = sizeof(struct rdma_nla_ls_gid)},
	[LS_NLA_TYPE_SGID]		= {.type = NLA_BINARY,
		.len = sizeof(struct rdma_nla_ls_gid)},
	[LS_NLA_TYPE_TCLASS]		= {.type = NLA_U8},
	[LS_NLA_TYPE_PKEY]		= {.type = NLA_U16},
	[LS_NLA_TYPE_QOS_CLASS]		= {.type = NLA_U16},
};


static int ib_sa_add_one(struct ib_device *device);
static void ib_sa_remove_one(struct ib_device *device, void *client_data);

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

static DEFINE_XARRAY_FLAGS(queries, XA_FLAGS_ALLOC | XA_FLAGS_LOCK_IRQ);

static DEFINE_SPINLOCK(tid_lock);
static u32 tid;

#define PATH_REC_FIELD(field) \
	.struct_offset_bytes = offsetof(struct sa_path_rec, field),	\
	.struct_size_bytes   = sizeof_field(struct sa_path_rec, 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(ib.dlid),
	  .offset_words = 10,
	  .offset_bits  = 0,
	  .size_bits    = 16 },
	{ PATH_REC_FIELD(ib.slid),
	  .offset_words = 10,
	  .offset_bits  = 16,
	  .size_bits    = 16 },
	{ PATH_REC_FIELD(ib.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 OPA_PATH_REC_FIELD(field) \
	.struct_offset_bytes = \
		offsetof(struct sa_path_rec, field), \
	.struct_size_bytes   = \
		sizeof_field(struct sa_path_rec, field),	\
	.field_name          = "sa_path_rec:" #field

static const struct ib_field opa_path_rec_table[] = {
	{ OPA_PATH_REC_FIELD(service_id),
	  .offset_words = 0,
	  .offset_bits  = 0,
	  .size_bits    = 64 },
	{ OPA_PATH_REC_FIELD(dgid),
	  .offset_words = 2,
	  .offset_bits  = 0,
	  .size_bits    = 128 },
	{ OPA_PATH_REC_FIELD(sgid),
	  .offset_words = 6,
	  .offset_bits  = 0,
	  .size_bits    = 128 },
	{ OPA_PATH_REC_FIELD(opa.dlid),
	  .offset_words = 10,
	  .offset_bits  = 0,
	  .size_bits    = 32 },
	{ OPA_PATH_REC_FIELD(opa.slid),
	  .offset_words = 11,
	  .offset_bits  = 0,
	  .size_bits    = 32 },
	{ OPA_PATH_REC_FIELD(opa.raw_traffic),
	  .offset_words = 12,
	  .offset_bits  = 0,
	  .size_bits    = 1 },
	{ RESERVED,
	  .offset_words = 12,
	  .offset_bits  = 1,
	  .size_bits    = 3 },
	{ OPA_PATH_REC_FIELD(flow_label),
	  .offset_words = 12,
	  .offset_bits  = 4,
	  .size_bits    = 20 },
	{ OPA_PATH_REC_FIELD(hop_limit),
	  .offset_words = 12,
	  .offset_bits  = 24,
	  .size_bits    = 8 },
	{ OPA_PATH_REC_FIELD(traffic_class),
	  .offset_words = 13,
	  .offset_bits  = 0,
	  .size_bits    = 8 },
	{ OPA_PATH_REC_FIELD(reversible),
	  .offset_words = 13,
	  .offset_bits  = 8,
	  .size_bits    = 1 },
	{ OPA_PATH_REC_FIELD(numb_path),
	  .offset_words = 13,
	  .offset_bits  = 9,
	  .size_bits    = 7 },
	{ OPA_PATH_REC_FIELD(pkey),
	  .offset_words = 13,
	  .offset_bits  = 16,
	  .size_bits    = 16 },
	{ OPA_PATH_REC_FIELD(opa.l2_8B),
	  .offset_words = 14,
	  .offset_bits  = 0,
	  .size_bits    = 1 },
	{ OPA_PATH_REC_FIELD(opa.l2_10B),
	  .offset_words = 14,
	  .offset_bits  = 1,
	  .size_bits    = 1 },
	{ OPA_PATH_REC_FIELD(opa.l2_9B),
	  .offset_words = 14,
	  .offset_bits  = 2,
	  .size_bits    = 1 },
	{ OPA_PATH_REC_FIELD(opa.l2_16B),
	  .offset_words = 14,
	  .offset_bits  = 3,
	  .size_bits    = 1 },
	{ RESERVED,
	  .offset_words = 14,
	  .offset_bits  = 4,
	  .size_bits    = 2 },
	{ OPA_PATH_REC_FIELD(opa.qos_type),
	  .offset_words = 14,
	  .offset_bits  = 6,
	  .size_bits    = 2 },
	{ OPA_PATH_REC_FIELD(opa.qos_priority),
	  .offset_words = 14,
	  .offset_bits  = 8,
	  .size_bits    = 8 },
	{ RESERVED,
	  .offset_words = 14,
	  .offset_bits  = 16,
	  .size_bits    = 3 },
	{ OPA_PATH_REC_FIELD(sl),
	  .offset_words = 14,
	  .offset_bits  = 19,
	  .size_bits    = 5 },
	{ RESERVED,
	  .offset_words = 14,
	  .offset_bits  = 24,
	  .size_bits    = 8 },
	{ OPA_PATH_REC_FIELD(mtu_selector),
	  .offset_words = 15,
	  .offset_bits  = 0,
	  .size_bits    = 2 },
	{ OPA_PATH_REC_FIELD(mtu),
	  .offset_words = 15,
	  .offset_bits  = 2,
	  .size_bits    = 6 },
	{ OPA_PATH_REC_FIELD(rate_selector),
	  .offset_words = 15,
	  .offset_bits  = 8,
	  .size_bits    = 2 },
	{ OPA_PATH_REC_FIELD(rate),
	  .offset_words = 15,
	  .offset_bits  = 10,
	  .size_bits    = 6 },
	{ OPA_PATH_REC_FIELD(packet_life_time_selector),
	  .offset_words = 15,
	  .offset_bits  = 16,
	  .size_bits    = 2 },
	{ OPA_PATH_REC_FIELD(packet_life_time),
	  .offset_words = 15,
	  .offset_bits  = 18,
	  .size_bits    = 6 },
	{ OPA_PATH_REC_FIELD(preference),
	  .offset_words = 15,
	  .offset_bits  = 24,
	  .size_bits    = 8 },
};

#define MCMEMBER_REC_FIELD(field) \
	.struct_offset_bytes = offsetof(struct ib_sa_mcmember_rec, field),	\
	.struct_size_bytes   = sizeof_field(struct ib_sa_mcmember_rec, 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 CLASSPORTINFO_REC_FIELD(field) \
	.struct_offset_bytes = offsetof(struct ib_class_port_info, field),	\
	.struct_size_bytes   = sizeof_field(struct ib_class_port_info, field),	\
	.field_name          = "ib_class_port_info:" #field

static const struct ib_field ib_classport_info_rec_table[] = {
	{ CLASSPORTINFO_REC_FIELD(base_version),
	  .offset_words = 0,
	  .offset_bits  = 0,
	  .size_bits    = 8 },
	{ CLASSPORTINFO_REC_FIELD(class_version),
	  .offset_words = 0,
	  .offset_bits  = 8,
	  .size_bits    = 8 },
	{ CLASSPORTINFO_REC_FIELD(capability_mask),
	  .offset_words = 0,
	  .offset_bits  = 16,
	  .size_bits    = 16 },
	{ CLASSPORTINFO_REC_FIELD(cap_mask2_resp_time),
	  .offset_words = 1,
	  .offset_bits  = 0,
	  .size_bits    = 32 },
	{ CLASSPORTINFO_REC_FIELD(redirect_gid),
	  .offset_words = 2,
	  .offset_bits  = 0,
	  .size_bits    = 128 },
	{ CLASSPORTINFO_REC_FIELD(redirect_tcslfl),
	  .offset_words = 6,
	  .offset_bits  = 0,
	  .size_bits    = 32 },
	{ CLASSPORTINFO_REC_FIELD(redirect_lid),
	  .offset_words = 7,
	  .offset_bits  = 0,
	  .size_bits    = 16 },
	{ CLASSPORTINFO_REC_FIELD(redirect_pkey),
	  .offset_words = 7,
	  .offset_bits  = 16,
	  .size_bits    = 16 },

	{ CLASSPORTINFO_REC_FIELD(redirect_qp),
	  .offset_words = 8,
	  .offset_bits  = 0,
	  .size_bits    = 32 },
	{ CLASSPORTINFO_REC_FIELD(redirect_qkey),
	  .offset_words = 9,
	  .offset_bits  = 0,
	  .size_bits    = 32 },

	{ CLASSPORTINFO_REC_FIELD(trap_gid),
	  .offset_words = 10,
	  .offset_bits  = 0,
	  .size_bits    = 128 },
	{ CLASSPORTINFO_REC_FIELD(trap_tcslfl),
	  .offset_words = 14,
	  .offset_bits  = 0,
	  .size_bits    = 32 },

	{ CLASSPORTINFO_REC_FIELD(trap_lid),
	  .offset_words = 15,
	  .offset_bits  = 0,
	  .size_bits    = 16 },
	{ CLASSPORTINFO_REC_FIELD(trap_pkey),
	  .offset_words = 15,
	  .offset_bits  = 16,
	  .size_bits    = 16 },

	{ CLASSPORTINFO_REC_FIELD(trap_hlqp),
	  .offset_words = 16,
	  .offset_bits  = 0,
	  .size_bits    = 32 },
	{ CLASSPORTINFO_REC_FIELD(trap_qkey),
	  .offset_words = 17,
	  .offset_bits  = 0,
	  .size_bits    = 32 },
};

#define OPA_CLASSPORTINFO_REC_FIELD(field) \
	.struct_offset_bytes =\
		offsetof(struct opa_class_port_info, field),	\
	.struct_size_bytes   = \
		sizeof_field(struct opa_class_port_info, field),	\
	.field_name          = "opa_class_port_info:" #field

static const struct ib_field opa_classport_info_rec_table[] = {
	{ OPA_CLASSPORTINFO_REC_FIELD(base_version),
	  .offset_words = 0,
	  .offset_bits  = 0,
	  .size_bits    = 8 },
	{ OPA_CLASSPORTINFO_REC_FIELD(class_version),
	  .offset_words = 0,
	  .offset_bits  = 8,
	  .size_bits    = 8 },
	{ OPA_CLASSPORTINFO_REC_FIELD(cap_mask),
	  .offset_words = 0,
	  .offset_bits  = 16,
	  .size_bits    = 16 },
	{ OPA_CLASSPORTINFO_REC_FIELD(cap_mask2_resp_time),
	  .offset_words = 1,
	  .offset_bits  = 0,
	  .size_bits    = 32 },
	{ OPA_CLASSPORTINFO_REC_FIELD(redirect_gid),
	  .offset_words = 2,
	  .offset_bits  = 0,
	  .size_bits    = 128 },
	{ OPA_CLASSPORTINFO_REC_FIELD(redirect_tc_fl),
	  .offset_words = 6,
	  .offset_bits  = 0,
	  .size_bits    = 32 },
	{ OPA_CLASSPORTINFO_REC_FIELD(redirect_lid),
	  .offset_words = 7,
	  .offset_bits  = 0,
	  .size_bits    = 32 },
	{ OPA_CLASSPORTINFO_REC_FIELD(redirect_sl_qp),
	  .offset_words = 8,
	  .offset_bits  = 0,
	  .size_bits    = 32 },
	{ OPA_CLASSPORTINFO_REC_FIELD(redirect_qkey),
	  .offset_words = 9,
	  .offset_bits  = 0,
	  .size_bits    = 32 },
	{ OPA_CLASSPORTINFO_REC_FIELD(trap_gid),
	  .offset_words = 10,
	  .offset_bits  = 0,
	  .size_bits    = 128 },
	{ OPA_CLASSPORTINFO_REC_FIELD(trap_tc_fl),
	  .offset_words = 14,
	  .offset_bits  = 0,
	  .size_bits    = 32 },
	{ OPA_CLASSPORTINFO_REC_FIELD(trap_lid),
	  .offset_words = 15,
	  .offset_bits  = 0,
	  .size_bits    = 32 },
	{ OPA_CLASSPORTINFO_REC_FIELD(trap_hl_qp),
	  .offset_words = 16,
	  .offset_bits  = 0,
	  .size_bits    = 32 },
	{ OPA_CLASSPORTINFO_REC_FIELD(trap_qkey),
	  .offset_words = 17,
	  .offset_bits  = 0,
	  .size_bits    = 32 },
	{ OPA_CLASSPORTINFO_REC_FIELD(trap_pkey),
	  .offset_words = 18,
	  .offset_bits  = 0,
	  .size_bits    = 16 },
	{ OPA_CLASSPORTINFO_REC_FIELD(redirect_pkey),
	  .offset_words = 18,
	  .offset_bits  = 16,
	  .size_bits    = 16 },
	{ OPA_CLASSPORTINFO_REC_FIELD(trap_sl_rsvd),
	  .offset_words = 19,
	  .offset_bits  = 0,
	  .size_bits    = 8 },
	{ RESERVED,
	  .offset_words = 19,
	  .offset_bits  = 8,
	  .size_bits    = 24 },
};

#define GUIDINFO_REC_FIELD(field) \
	.struct_offset_bytes = offsetof(struct ib_sa_guidinfo_rec, field),	\
	.struct_size_bytes   = sizeof_field(struct ib_sa_guidinfo_rec, field),	\
	.field_name          = "sa_guidinfo_rec:" #field

static const struct ib_field guidinfo_rec_table[] = {
	{ GUIDINFO_REC_FIELD(lid),
	  .offset_words = 0,
	  .offset_bits  = 0,
	  .size_bits    = 16 },
	{ GUIDINFO_REC_FIELD(block_num),
	  .offset_words = 0,
	  .offset_bits  = 16,
	  .size_bits    = 8 },
	{ GUIDINFO_REC_FIELD(res1),
	  .offset_words = 0,
	  .offset_bits  = 24,
	  .size_bits    = 8 },
	{ GUIDINFO_REC_FIELD(res2),
	  .offset_words = 1,
	  .offset_bits  = 0,
	  .size_bits    = 32 },
	{ GUIDINFO_REC_FIELD(guid_info_list),
	  .offset_words = 2,
	  .offset_bits  = 0,
	  .size_bits    = 512 },
};

#define RDMA_PRIMARY_PATH_MAX_REC_NUM 3

static inline void ib_sa_disable_local_svc(struct ib_sa_query *query)
{
	query->flags &= ~IB_SA_ENABLE_LOCAL_SERVICE;
}

static inline int ib_sa_query_cancelled(struct ib_sa_query *query)
{
	return (query->flags & IB_SA_CANCEL);
}

static void ib_nl_set_path_rec_attrs(struct sk_buff *skb,
				     struct ib_sa_query *query)
{
	struct sa_path_rec *sa_rec = query->mad_buf->context[1];
	struct ib_sa_mad *mad = query->mad_buf->mad;
	ib_sa_comp_mask comp_mask = mad->sa_hdr.comp_mask;
	u16 val16;
	u64 val64;
	struct rdma_ls_resolve_header *header;

	query->mad_buf->context[1] = NULL;

	/* Construct the family header first */
	header = skb_put(skb, NLMSG_ALIGN(sizeof(*header)));
	strscpy_pad(header->device_name,
		    dev_name(&query->port->agent->device->dev),
		    LS_DEVICE_NAME_MAX);
	header->port_num = query->port->port_num;

	if ((comp_mask & IB_SA_PATH_REC_REVERSIBLE) &&
	    sa_rec->reversible != 0)
		query->path_use = LS_RESOLVE_PATH_USE_ALL;
	else
		query->path_use = LS_RESOLVE_PATH_USE_UNIDIRECTIONAL;
	header->path_use = query->path_use;

	/* Now build the attributes */
	if (comp_mask & IB_SA_PATH_REC_SERVICE_ID) {
		val64 = be64_to_cpu(sa_rec->service_id);
		nla_put(skb, RDMA_NLA_F_MANDATORY | LS_NLA_TYPE_SERVICE_ID,
			sizeof(val64), &val64);
	}
	if (comp_mask & IB_SA_PATH_REC_DGID)
		nla_put(skb, RDMA_NLA_F_MANDATORY | LS_NLA_TYPE_DGID,
			sizeof(sa_rec->dgid), &sa_rec->dgid);
	if (comp_mask & IB_SA_PATH_REC_SGID)
		nla_put(skb, RDMA_NLA_F_MANDATORY | LS_NLA_TYPE_SGID,
			sizeof(sa_rec->sgid), &sa_rec->sgid);
	if (comp_mask & IB_SA_PATH_REC_TRAFFIC_CLASS)
		nla_put(skb, RDMA_NLA_F_MANDATORY | LS_NLA_TYPE_TCLASS,
			sizeof(sa_rec->traffic_class), &sa_rec->traffic_class);

	if (comp_mask & IB_SA_PATH_REC_PKEY) {
		val16 = be16_to_cpu(sa_rec->pkey);
		nla_put(skb, RDMA_NLA_F_MANDATORY | LS_NLA_TYPE_PKEY,
			sizeof(val16), &val16);
	}
	if (comp_mask & IB_SA_PATH_REC_QOS_CLASS) {
		val16 = be16_to_cpu(sa_rec->qos_class);
		nla_put(skb, RDMA_NLA_F_MANDATORY | LS_NLA_TYPE_QOS_CLASS,
			sizeof(val16), &val16);
	}
}

static int ib_nl_get_path_rec_attrs_len(ib_sa_comp_mask comp_mask)
{
	int len = 0;

	if (comp_mask & IB_SA_PATH_REC_SERVICE_ID)
		len += nla_total_size(sizeof(u64));
	if (comp_mask & IB_SA_PATH_REC_DGID)
		len += nla_total_size(sizeof(struct rdma_nla_ls_gid));
	if (comp_mask & IB_SA_PATH_REC_SGID)
		len += nla_total_size(sizeof(struct rdma_nla_ls_gid));
	if (comp_mask & IB_SA_PATH_REC_TRAFFIC_CLASS)
		len += nla_total_size(sizeof(u8));
	if (comp_mask & IB_SA_PATH_REC_PKEY)
		len += nla_total_size(sizeof(u16));
	if (comp_mask & IB_SA_PATH_REC_QOS_CLASS)
		len += nla_total_size(sizeof(u16));

	/*
	 * Make sure that at least some of the required comp_mask bits are
	 * set.
	 */
	if (WARN_ON(len == 0))
		return len;

	/* Add the family header */
	len += NLMSG_ALIGN(sizeof(struct rdma_ls_resolve_header));

	return len;
}

static int ib_nl_make_request(struct ib_sa_query *query, gfp_t gfp_mask)
{
	struct sk_buff *skb = NULL;
	struct nlmsghdr *nlh;
	void *data;
	struct ib_sa_mad *mad;
	int len;
	unsigned long flags;
	unsigned long delay;
	gfp_t gfp_flag;
	int ret;

	INIT_LIST_HEAD(&query->list);
	query->seq = (u32)atomic_inc_return(&ib_nl_sa_request_seq);

	mad = query->mad_buf->mad;
	len = ib_nl_get_path_rec_attrs_len(mad->sa_hdr.comp_mask);
	if (len <= 0)
		return -EMSGSIZE;

	skb = nlmsg_new(len, gfp_mask);
	if (!skb)
		return -ENOMEM;

	/* Put nlmsg header only for now */
	data = ibnl_put_msg(skb, &nlh, query->seq, 0, RDMA_NL_LS,
			    RDMA_NL_LS_OP_RESOLVE, NLM_F_REQUEST);
	if (!data) {
		nlmsg_free(skb);
		return -EMSGSIZE;
	}

	/* Add attributes */
	ib_nl_set_path_rec_attrs(skb, query);

	/* Repair the nlmsg header length */
	nlmsg_end(skb, nlh);

	gfp_flag = ((gfp_mask & GFP_ATOMIC) == GFP_ATOMIC) ? GFP_ATOMIC :
		GFP_NOWAIT;

	spin_lock_irqsave(&ib_nl_request_lock, flags);
	ret = rdma_nl_multicast(&init_net, skb, RDMA_NL_GROUP_LS, gfp_flag);

	if (ret)
		goto out;

	/* Put the request on the list.*/
	delay = msecs_to_jiffies(sa_local_svc_timeout_ms);
	query->timeout = delay + jiffies;
	list_add_tail(&query->list, &ib_nl_request_list);
	/* Start the timeout if this is the only request */
	if (ib_nl_request_list.next == &query->list)
		queue_delayed_work(ib_nl_wq, &ib_nl_timed_work, delay);

out:
	spin_unlock_irqrestore(&ib_nl_request_lock, flags);

	return ret;
}

static int ib_nl_cancel_request(struct ib_sa_query *query)
{
	unsigned long flags;
	struct ib_sa_query *wait_query;
	int found = 0;

	spin_lock_irqsave(&ib_nl_request_lock, flags);
	list_for_each_entry(wait_query, &ib_nl_request_list, list) {
		/* Let the timeout to take care of the callback */
		if (query == wait_query) {
			query->flags |= IB_SA_CANCEL;
			query->timeout = jiffies;
			list_move(&query->list, &ib_nl_request_list);
			found = 1;
			mod_delayed_work(ib_nl_wq, &ib_nl_timed_work, 1);
			break;
		}
	}
	spin_unlock_irqrestore(&ib_nl_request_lock, flags);

	return found;
}

static void send_handler(struct ib_mad_agent *agent,
			 struct ib_mad_send_wc *mad_send_wc);

static void ib_nl_process_good_resolve_rsp(struct ib_sa_query *query,
					   const struct nlmsghdr *nlh)
{
	struct sa_path_rec recs[RDMA_PRIMARY_PATH_MAX_REC_NUM];
	struct ib_sa_path_query *path_query;
	struct ib_path_rec_data *rec_data;
	struct ib_mad_send_wc mad_send_wc;
	const struct nlattr *head, *curr;
	struct ib_sa_mad *mad = NULL;
	int len, rem, status = -EIO;
	unsigned int num_prs = 0;
	u32 mask = 0;

	if (!query->callback)
		goto out;

	path_query = container_of(query, struct ib_sa_path_query, sa_query);
	mad = query->mad_buf->mad;

	head = (const struct nlattr *) nlmsg_data(nlh);
	len = nlmsg_len(nlh);
	switch (query->path_use) {
	case LS_RESOLVE_PATH_USE_UNIDIRECTIONAL:
		mask = IB_PATH_PRIMARY | IB_PATH_OUTBOUND;
		break;

	case LS_RESOLVE_PATH_USE_ALL:
		mask = IB_PATH_PRIMARY;
		break;

	case LS_RESOLVE_PATH_USE_GMP:
	default:
		mask = IB_PATH_PRIMARY | IB_PATH_GMP |
			IB_PATH_BIDIRECTIONAL;
		break;
	}

	nla_for_each_attr(curr, head, len, rem) {
		if (curr->nla_type != LS_NLA_TYPE_PATH_RECORD)
			continue;

		rec_data = nla_data(curr);
		if ((rec_data->flags & mask) != mask)
			continue;

		if ((query->flags & IB_SA_QUERY_OPA) ||
		    path_query->conv_pr) {
			mad->mad_hdr.method |= IB_MGMT_METHOD_RESP;
			memcpy(mad->data, rec_data->path_rec,
			       sizeof(rec_data->path_rec));
			query->callback(query, 0, mad);
			goto out;
		}

		status = 0;
		ib_unpack(path_rec_table, ARRAY_SIZE(path_rec_table),
			  rec_data->path_rec, &recs[num_prs]);
		recs[num_prs].flags = rec_data->flags;
		recs[num_prs].rec_type = SA_PATH_REC_TYPE_IB;
		sa_path_set_dmac_zero(&recs[num_prs]);

		num_prs++;
		if (num_prs >= RDMA_PRIMARY_PATH_MAX_REC_NUM)
			break;
	}

	if (!status) {
		mad->mad_hdr.method |= IB_MGMT_METHOD_RESP;
		path_query->callback(status, recs, num_prs,
				     path_query->context);
	} else
		query->callback(query, status, mad);

out:
	mad_send_wc.send_buf = query->mad_buf;
	mad_send_wc.status = IB_WC_SUCCESS;
	send_handler(query->mad_buf->mad_agent, &mad_send_wc);
}

static void ib_nl_request_timeout(struct work_struct *work)
{
	unsigned long flags;
	struct ib_sa_query *query;
	unsigned long delay;
	struct ib_mad_send_wc mad_send_wc;
	int ret;

	spin_lock_irqsave(&ib_nl_request_lock, flags);
	while (!list_empty(&ib_nl_request_list)) {
		query = list_entry(ib_nl_request_list.next,
				   struct ib_sa_query, list);

		if (time_after(query->timeout, jiffies)) {
			delay = query->timeout - jiffies;
			if ((long)delay <= 0)
				delay = 1;
			queue_delayed_work(ib_nl_wq, &ib_nl_timed_work, delay);
			break;
		}

		list_del(&query->list);
		ib_sa_disable_local_svc(query);
		/* Hold the lock to protect against query cancellation */
		if (ib_sa_query_cancelled(query))
			ret = -1;
		else
			ret = ib_post_send_mad(query->mad_buf, NULL);
		if (ret) {
			mad_send_wc.send_buf = query->mad_buf;
			mad_send_wc.status = IB_WC_WR_FLUSH_ERR;
			spin_unlock_irqrestore(&ib_nl_request_lock, flags);
			send_handler(query->port->agent, &mad_send_wc);
			spin_lock_irqsave(&ib_nl_request_lock, flags);
		}
	}
	spin_unlock_irqrestore(&ib_nl_request_lock, flags);
}

int ib_nl_handle_set_timeout(struct sk_buff *skb,
			     struct nlmsghdr *nlh,
			     struct netlink_ext_ack *extack)
{
	int timeout, delta, abs_delta;
	const struct nlattr *attr;
	unsigned long flags;
	struct ib_sa_query *query;
	long delay = 0;
	struct nlattr *tb[LS_NLA_TYPE_MAX];
	int ret;

	if (!(nlh->nlmsg_flags & NLM_F_REQUEST) ||
	    !(NETLINK_CB(skb).sk))
		return -EPERM;

	ret = nla_parse_deprecated(tb, LS_NLA_TYPE_MAX - 1, nlmsg_data(nlh),
				   nlmsg_len(nlh), ib_nl_policy, NULL);
	attr = (const struct nlattr *)tb[LS_NLA_TYPE_TIMEOUT];
	if (ret || !attr)
		goto settimeout_out;

	timeout = *(int *) nla_data(attr);
	if (timeout < IB_SA_LOCAL_SVC_TIMEOUT_MIN)
		timeout = IB_SA_LOCAL_SVC_TIMEOUT_MIN;
	if (timeout > IB_SA_LOCAL_SVC_TIMEOUT_MAX)
		timeout = IB_SA_LOCAL_SVC_TIMEOUT_MAX;

	spin_lock_irqsave(&ib_nl_request_lock, flags);

	delta = timeout - sa_local_svc_timeout_ms;
	if (delta < 0)
		abs_delta = -delta;
	else
		abs_delta = delta;

	if (delta != 0) {
		sa_local_svc_timeout_ms = timeout;
		list_for_each_entry(query, &ib_nl_request_list, list) {
			if (delta < 0 && abs_delta > query->timeout)
				query->timeout = 0;
			else
				query->timeout += delta;

			/* Get the new delay from the first entry */
			if (!delay) {
				delay = query->timeout - jiffies;
				if (delay <= 0)
					delay = 1;
			}
		}
		if (delay)
			mod_delayed_work(ib_nl_wq, &ib_nl_timed_work,
					 (unsigned long)delay);
	}

	spin_unlock_irqrestore(&ib_nl_request_lock, flags);

settimeout_out:
	return 0;
}

static inline int ib_nl_is_good_resolve_resp(const struct nlmsghdr *nlh)
{
	struct nlattr *tb[LS_NLA_TYPE_MAX];
	int ret;

	if (nlh->nlmsg_flags & RDMA_NL_LS_F_ERR)
		return 0;

	ret = nla_parse_deprecated(tb, LS_NLA_TYPE_MAX - 1, nlmsg_data(nlh),
				   nlmsg_len(nlh), ib_nl_policy, NULL);
	if (ret)
		return 0;

	return 1;
}

int ib_nl_handle_resolve_resp(struct sk_buff *skb,
			      struct nlmsghdr *nlh,
			      struct netlink_ext_ack *extack)
{
	unsigned long flags;
	struct ib_sa_query *query = NULL, *iter;
	struct ib_mad_send_buf *send_buf;
	struct ib_mad_send_wc mad_send_wc;
	int ret;

	if ((nlh->nlmsg_flags & NLM_F_REQUEST) ||
	    !(NETLINK_CB(skb).sk))
		return -EPERM;

	spin_lock_irqsave(&ib_nl_request_lock, flags);
	list_for_each_entry(iter, &ib_nl_request_list, list) {
		/*
		 * If the query is cancelled, let the timeout routine
		 * take care of it.
		 */
		if (nlh->nlmsg_seq == iter->seq) {
			if (!ib_sa_query_cancelled(iter)) {
				list_del(&iter->list);
				query = iter;
			}
			break;
		}
	}

	if (!query) {
		spin_unlock_irqrestore(&ib_nl_request_lock, flags);
		goto resp_out;
	}

	send_buf = query->mad_buf;

	if (!ib_nl_is_good_resolve_resp(nlh)) {
		/* if the result is a failure, send out the packet via IB */
		ib_sa_disable_local_svc(query);
		ret = ib_post_send_mad(query->mad_buf, NULL);
		spin_unlock_irqrestore(&ib_nl_request_lock, flags);
		if (ret) {
			mad_send_wc.send_buf = send_buf;
			mad_send_wc.status = IB_WC_GENERAL_ERR;
			send_handler(query->port->agent, &mad_send_wc);
		}
	} else {
		spin_unlock_irqrestore(&ib_nl_request_lock, flags);
		ib_nl_process_good_resolve_rsp(query, nlh);
	}

resp_out:
	return 0;
}

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

	rdma_destroy_ah(sm_ah->ah, 0);
	kfree(sm_ah);
}

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_send_buf *mad_buf;

	xa_lock_irqsave(&queries, flags);
	if (xa_load(&queries, id) != query) {
		xa_unlock_irqrestore(&queries, flags);
		return;
	}
	mad_buf = query->mad_buf;
	xa_unlock_irqrestore(&queries, flags);

	/*
	 * If the query is still on the netlink request list, schedule
	 * it to be cancelled by the timeout routine. Otherwise, it has been
	 * sent to the MAD layer and has to be cancelled from there.
	 */
	if (!ib_nl_cancel_request(query))
		ib_cancel_mad(mad_buf);
}
EXPORT_SYMBOL(ib_sa_cancel_query);

static u8 get_src_path_mask(struct ib_device *device, u32 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;
}

static int init_ah_attr_grh_fields(struct ib_device *device, u32 port_num,
				   struct sa_path_rec *rec,
				   struct rdma_ah_attr *ah_attr,
				   const struct ib_gid_attr *gid_attr)
{
	enum ib_gid_type type = sa_conv_pathrec_to_gid_type(rec);

	if (!gid_attr) {
		gid_attr = rdma_find_gid_by_port(device, &rec->sgid, type,
						 port_num, NULL);
		if (IS_ERR(gid_attr))
			return PTR_ERR(gid_attr);
	} else
		rdma_hold_gid_attr(gid_attr);

	rdma_move_grh_sgid_attr(ah_attr, &rec->dgid,
				be32_to_cpu(rec->flow_label),
				rec->hop_limit,	rec->traffic_class,
				gid_attr);
	return 0;
}

/**
 * ib_init_ah_attr_from_path - Initialize address handle attributes based on
 *   an SA path record.
 * @device: Device associated ah attributes initialization.
 * @port_num: Port on the specified device.
 * @rec: path record entry to use for ah attributes initialization.
 * @ah_attr: address handle attributes to initialization from path record.
 * @gid_attr: SGID attribute to consider during initialization.
 *
 * When ib_init_ah_attr_from_path() returns success,
 * (a) for IB link layer it optionally contains a reference to SGID attribute
 * when GRH is present for IB link layer.
 * (b) for RoCE link layer it contains a reference to SGID attribute.
 * User must invoke rdma_destroy_ah_attr() to release reference to SGID
 * attributes which are initialized using ib_init_ah_attr_from_path().
 */
int ib_init_ah_attr_from_path(struct ib_device *device, u32 port_num,
			      struct sa_path_rec *rec,
			      struct rdma_ah_attr *ah_attr,
			      const struct ib_gid_attr *gid_attr)
{
	int ret = 0;

	memset(ah_attr, 0, sizeof(*ah_attr));
	ah_attr->type = rdma_ah_find_type(device, port_num);
	rdma_ah_set_sl(ah_attr, rec->sl);
	rdma_ah_set_port_num(ah_attr, port_num);
	rdma_ah_set_static_rate(ah_attr, rec->rate);

	if (sa_path_is_roce(rec)) {
		ret = roce_resolve_route_from_path(rec, gid_attr);
		if (ret)
			return ret;

		memcpy(ah_attr->roce.dmac, sa_path_get_dmac(rec), ETH_ALEN);
	} else {
		rdma_ah_set_dlid(ah_attr, be32_to_cpu(sa_path_get_dlid(rec)));
		if (sa_path_is_opa(rec) &&
		    rdma_ah_get_dlid(ah_attr) == be16_to_cpu(IB_LID_PERMISSIVE))
			rdma_ah_set_make_grd(ah_attr, true);

		rdma_ah_set_path_bits(ah_attr,
				      be32_to_cpu(sa_path_get_slid(rec)) &
				      get_src_path_mask(device, port_num));
	}

	if (rec->hop_limit > 0 || sa_path_is_roce(rec))
		ret = init_ah_attr_grh_fields(device, port_num,
					      rec, ah_attr, gid_attr);
	return ret;
}
EXPORT_SYMBOL(ib_init_ah_attr_from_path);

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

	spin_lock_irqsave(&query->port->ah_lock, flags);
	if (!query->port->sm_ah) {
		spin_unlock_irqrestore(&query->port->ah_lock, flags);
		return -EAGAIN;
	}
	kref_get(&query->port->sm_ah->ref);
	query->sm_ah = query->port->sm_ah;
	spin_unlock_irqrestore(&query->port->ah_lock, flags);

	/*
	 * Always check if sm_ah has valid dlid assigned,
	 * before querying for class port info
	 */
	if ((rdma_query_ah(query->sm_ah->ah, &ah_attr) < 0) ||
	    !rdma_is_valid_unicast_lid(&ah_attr)) {
		kref_put(&query->sm_ah->ref, free_sm_ah);
		return -EAGAIN;
	}
	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,
					    ((query->flags & IB_SA_QUERY_OPA) ?
					     OPA_MGMT_BASE_VERSION :
					     IB_MGMT_BASE_VERSION));
	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_query *query, struct ib_mad_agent *agent)
{
	struct ib_sa_mad *mad = query->mad_buf->mad;
	unsigned long flags;

	memset(mad, 0, sizeof *mad);

	if (query->flags & IB_SA_QUERY_OPA) {
		mad->mad_hdr.base_version  = OPA_MGMT_BASE_VERSION;
		mad->mad_hdr.class_version = OPA_SA_CLASS_VERSION;
	} else {
		mad->mad_hdr.base_version  = IB_MGMT_BASE_VERSION;
		mad->mad_hdr.class_version = IB_SA_CLASS_VERSION;
	}
	mad->mad_hdr.mgmt_class    = IB_MGMT_CLASS_SUBN_ADM;
	spin_lock_irqsave(&tid_lock, flags);
	mad->mad_hdr.tid           =
		cpu_to_be64(((u64) agent->hi_tid) << 32 | tid++);
	spin_unlock_irqrestore(&tid_lock, flags);
}

static int send_mad(struct ib_sa_query *query, unsigned long timeout_ms,
		    gfp_t gfp_mask)
{
	unsigned long flags;
	int ret, id;
	const int nmbr_sa_query_retries = 10;

	xa_lock_irqsave(&queries, flags);
	ret = __xa_alloc(&queries, &id, query, xa_limit_32b, gfp_mask);
	xa_unlock_irqrestore(&queries, flags);
	if (ret < 0)
		return ret;

	query->mad_buf->timeout_ms  = timeout_ms / nmbr_sa_query_retries;
	query->mad_buf->retries = nmbr_sa_query_retries;
	if (!query->mad_buf->timeout_ms) {
		/* Special case, very small timeout_ms */
		query->mad_buf->timeout_ms = 1;
		query->mad_buf->retries = timeout_ms;
	}
	query->mad_buf->context[0] = query;
	query->id = id;

	if ((query->flags & IB_SA_ENABLE_LOCAL_SERVICE) &&
	    (!(query->flags & IB_SA_QUERY_OPA))) {
		if (rdma_nl_chk_listeners(RDMA_NL_GROUP_LS)) {
			if (!ib_nl_make_request(query, gfp_mask))
				return id;
		}
		ib_sa_disable_local_svc(query);
	}

	ret = ib_post_send_mad(query->mad_buf, NULL);
	if (ret) {
		xa_lock_irqsave(&queries, flags);
		__xa_erase(&queries, id);
		xa_unlock_irqrestore(&queries, flags);
	}

	/*
	 * It's not safe to dereference query any more, because the
	 * send may already have completed and freed the query in
	 * another context.
	 */
	return ret ? ret : id;
}

void ib_sa_unpack_path(void *attribute, struct sa_path_rec *rec)
{
	ib_unpack(path_rec_table, ARRAY_SIZE(path_rec_table), attribute, rec);
}
EXPORT_SYMBOL(ib_sa_unpack_path);

void ib_sa_pack_path(struct sa_path_rec *rec, void *attribute)
{
	ib_pack(path_rec_table, ARRAY_SIZE(path_rec_table), rec, attribute);
}
EXPORT_SYMBOL(ib_sa_pack_path);

static bool ib_sa_opa_pathrecord_support(struct ib_sa_client *client,
					 struct ib_sa_device *sa_dev,
					 u32 port_num)
{
	struct ib_sa_port *port;
	unsigned long flags;
	bool ret = false;

	port = &sa_dev->port[port_num - sa_dev->start_port];
	spin_lock_irqsave(&port->classport_lock, flags);
	if (!port->classport_info.valid)
		goto ret;

	if (port->classport_info.data.type == RDMA_CLASS_PORT_INFO_OPA)
		ret = opa_get_cpi_capmask2(&port->classport_info.data.opa) &
			OPA_CLASS_PORT_INFO_PR_SUPPORT;
ret:
	spin_unlock_irqrestore(&port->classport_lock, flags);
	return ret;
}

enum opa_pr_supported {
	PR_NOT_SUPPORTED,
	PR_OPA_SUPPORTED,
	PR_IB_SUPPORTED
};

/*
 * opa_pr_query_possible - Check if current PR query can be an OPA query.
 *
 * Returns PR_NOT_SUPPORTED if a path record query is not
 * possible, PR_OPA_SUPPORTED if an OPA path record query
 * is possible and PR_IB_SUPPORTED if an IB path record
 * query is possible.
 */
static int opa_pr_query_possible(struct ib_sa_client *client,
				 struct ib_sa_device *sa_dev,
				 struct ib_device *device, u32 port_num)
{
	struct ib_port_attr port_attr;

	if (ib_query_port(device, port_num, &port_attr))
		return PR_NOT_SUPPORTED;

	if (ib_sa_opa_pathrecord_support(client, sa_dev, port_num))
		return PR_OPA_SUPPORTED;

	if (port_attr.lid >= be16_to_cpu(IB_MULTICAST_LID_BASE))
		return PR_NOT_SUPPORTED;
	else
		return PR_IB_SUPPORTED;
}

static void ib_sa_path_rec_callback(struct ib_sa_query *sa_query,
				    int status, struct ib_sa_mad *mad)
{
	struct ib_sa_path_query *query =
		container_of(sa_query, struct ib_sa_path_query, sa_query);
	struct sa_path_rec rec = {};

	if (!mad) {
		query->callback(status, NULL, 0, query->context);
		return;
	}

	if (sa_query->flags & IB_SA_QUERY_OPA) {
		ib_unpack(opa_path_rec_table, ARRAY_SIZE(opa_path_rec_table),
			  mad->data, &rec);
		rec.rec_type = SA_PATH_REC_TYPE_OPA;
		query->callback(status, &rec, 1, query->context);
		return;
	}

	ib_unpack(path_rec_table, ARRAY_SIZE(path_rec_table),
		  mad->data, &rec);
	rec.rec_type = SA_PATH_REC_TYPE_IB;
	sa_path_set_dmac_zero(&rec);

	if (query->conv_pr) {
		struct sa_path_rec opa;

		memset(&opa, 0, sizeof(struct sa_path_rec));
		sa_convert_path_ib_to_opa(&opa, &rec);
		query->callback(status, &opa, 1, query->context);
	} else {
		query->callback(status, &rec, 1, query->context);
	}
}

static void ib_sa_path_rec_release(struct ib_sa_query *sa_query)
{
	struct ib_sa_path_query *query =
		container_of(sa_query, struct ib_sa_path_query, sa_query);

	kfree(query->conv_pr);
	kfree(query);
}

/**
 * ib_sa_path_rec_get - Start a Path get query
 * @client:SA client
 * @device:device to send query on
 * @port_num: port number to send query on
 * @rec:Path Record to send in query
 * @comp_mask:component mask to send in query
 * @timeout_ms:time to wait for response
 * @gfp_mask:GFP mask to use for internal allocations
 * @callback:function called when query completes, times out or is
 * canceled
 * @context:opaque user context passed to callback
 * @sa_query:query context, used to cancel query
 *
 * Send a Path Record Get query to the SA to look up a path.  The
 * callback function will be called when the query completes (or
 * fails); status is 0 for a successful response, -EINTR if the query
 * is canceled, -ETIMEDOUT is the query timed out, or -EIO if an error
 * occurred sending the query.  The resp parameter of the callback is
 * only valid if status is 0.
 *
 * If the return value of ib_sa_path_rec_get() is negative, it is an
 * error code.  Otherwise it is a query ID that can be used to cancel
 * the query.
 */
int ib_sa_path_rec_get(struct ib_sa_client *client,
		       struct ib_device *device, u32 port_num,
		       struct sa_path_rec *rec,
		       ib_sa_comp_mask comp_mask,
		       unsigned long timeout_ms, gfp_t gfp_mask,
		       void (*callback)(int status,
					struct sa_path_rec *resp,
					unsigned int num_paths, void *context),
		       void *context,
		       struct ib_sa_query **sa_query)
{
	struct ib_sa_path_query *query;
	struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client);
	struct ib_sa_port   *port;
	struct ib_mad_agent *agent;
	struct ib_sa_mad *mad;
	enum opa_pr_supported status;
	int ret;

	if (!sa_dev)
		return -ENODEV;

	if ((rec->rec_type != SA_PATH_REC_TYPE_IB) &&
	    (rec->rec_type != SA_PATH_REC_TYPE_OPA))
		return -EINVAL;

	port  = &sa_dev->port[port_num - sa_dev->start_port];
	agent = port->agent;

	query = kzalloc(sizeof(*query), gfp_mask);
	if (!query)
		return -ENOMEM;

	query->sa_query.port     = port;
	if (rec->rec_type == SA_PATH_REC_TYPE_OPA) {
		status = opa_pr_query_possible(client, sa_dev, device, port_num);
		if (status == PR_NOT_SUPPORTED) {
			ret = -EINVAL;
			goto err1;
		} else if (status == PR_OPA_SUPPORTED) {
			query->sa_query.flags |= IB_SA_QUERY_OPA;
		} else {
			query->conv_pr =
				kmalloc(sizeof(*query->conv_pr), gfp_mask);
			if (!query->conv_pr) {
				ret = -ENOMEM;
				goto err1;
			}
		}
	}

	ret = alloc_mad(&query->sa_query, gfp_mask);
	if (ret)
		goto err2;

	ib_sa_client_get(client);
	query->sa_query.client = client;
	query->callback        = callback;
	query->context         = context;

	mad = query->sa_query.mad_buf->mad;
	init_mad(&query->sa_query, agent);

	query->sa_query.callback = callback ? ib_sa_path_rec_callback : NULL;
	query->sa_query.release  = ib_sa_path_rec_release;
	mad->mad_hdr.method	 = IB_MGMT_METHOD_GET;
	mad->mad_hdr.attr_id	 = cpu_to_be16(IB_SA_ATTR_PATH_REC);
	mad->sa_hdr.comp_mask	 = comp_mask;

	if (query->sa_query.flags & IB_SA_QUERY_OPA) {
		ib_pack(opa_path_rec_table, ARRAY_SIZE(opa_path_rec_table),
			rec, mad->data);
	} else if (query->conv_pr) {
		sa_convert_path_opa_to_ib(query->conv_pr, rec);
		ib_pack(path_rec_table, ARRAY_SIZE(path_rec_table),
			query->conv_pr, mad->data);
	} else {
		ib_pack(path_rec_table, ARRAY_SIZE(path_rec_table),
			rec, mad->data);
	}

	*sa_query = &query->sa_query;

	query->sa_query.flags |= IB_SA_ENABLE_LOCAL_SERVICE;
	query->sa_query.mad_buf->context[1] = (query->conv_pr) ?
						query->conv_pr : rec;

	ret = send_mad(&query->sa_query, timeout_ms, gfp_mask);
	if (ret < 0)
		goto err3;

	return ret;

err3:
	*sa_query = NULL;
	ib_sa_client_put(query->sa_query.client);
	free_mad(&query->sa_query);
err2:
	kfree(query->conv_pr);
err1:
	kfree(query);
	return ret;
}
EXPORT_SYMBOL(ib_sa_path_rec_get);

static void ib_sa_mcmember_rec_callback(struct ib_sa_query *sa_query,
					int status, struct ib_sa_mad *mad)
{
	struct ib_sa_mcmember_query *query =
		container_of(sa_query, struct ib_sa_mcmember_query, sa_query);

	if (mad) {
		struct ib_sa_mcmember_rec rec;

		ib_unpack(mcmember_rec_table, ARRAY_SIZE(mcmember_rec_table),
			  mad->data, &rec);
		query->callback(status, &rec, query->context);
	} else
		query->callback(status, NULL, query->context);
}

static void ib_sa_mcmember_rec_release(struct ib_sa_query *sa_query)
{
	kfree(container_of(sa_query, struct ib_sa_mcmember_query, sa_query));
}

int ib_sa_mcmember_rec_query(struct ib_sa_client *client,
			     struct ib_device *device, u32 port_num,
			     u8 method,
			     struct ib_sa_mcmember_rec *rec,
			     ib_sa_comp_mask comp_mask,
			     unsigned long timeout_ms, gfp_t gfp_mask,
			     void (*callback)(int status,
					      struct ib_sa_mcmember_rec *resp,
					      void *context),
			     void *context,
			     struct ib_sa_query **sa_query)
{
	struct ib_sa_mcmember_query *query;
	struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client);
	struct ib_sa_port   *port;
	struct ib_mad_agent *agent;
	struct ib_sa_mad *mad;
	int ret;

	if (!sa_dev)
		return -ENODEV;

	port  = &sa_dev->port[port_num - sa_dev->start_port];
	agent = port->agent;

	query = kzalloc(sizeof(*query), gfp_mask);
	if (!query)
		return -ENOMEM;

	query->sa_query.port     = port;
	ret = alloc_mad(&query->sa_query, gfp_mask);
	if (ret)
		goto err1;

	ib_sa_client_get(client);
	query->sa_query.client = client;
	query->callback        = callback;
	query->context         = context;

	mad = query->sa_query.mad_buf->mad;
	init_mad(&query->sa_query, agent);

	query->sa_query.callback = callback ? ib_sa_mcmember_rec_callback : NULL;
	query->sa_query.release  = ib_sa_mcmember_rec_release;
	mad->mad_hdr.method	 = method;
	mad->mad_hdr.attr_id	 = cpu_to_be16(IB_SA_ATTR_MC_MEMBER_REC);
	mad->sa_hdr.comp_mask	 = comp_mask;

	ib_pack(mcmember_rec_table, ARRAY_SIZE(mcmember_rec_table),
		rec, mad->data);

	*sa_query = &query->sa_query;

	ret = send_mad(&query->sa_query, timeout_ms, gfp_mask);
	if (ret < 0)
		goto err2;

	return ret;

err2:
	*sa_query = NULL;
	ib_sa_client_put(query->sa_query.client);
	free_mad(&query->sa_query);

err1:
	kfree(query);
	return ret;
}

/* Support GuidInfoRecord */
static void ib_sa_guidinfo_rec_callback(struct ib_sa_query *sa_query,
					int status, struct ib_sa_mad *mad)
{
	struct ib_sa_guidinfo_query *query =
		container_of(sa_query, struct ib_sa_guidinfo_query, sa_query);

	if (mad) {
		struct ib_sa_guidinfo_rec rec;

		ib_unpack(guidinfo_rec_table, ARRAY_SIZE(guidinfo_rec_table),
			  mad->data, &rec);
		query->callback(status, &rec, query->context);
	} else
		query->callback(status, NULL, query->context);
}

static void ib_sa_guidinfo_rec_release(struct ib_sa_query *sa_query)
{
	kfree(container_of(sa_query, struct ib_sa_guidinfo_query, sa_query));
}

int ib_sa_guid_info_rec_query(struct ib_sa_client *client,
			      struct ib_device *device, u32 port_num,
			      struct ib_sa_guidinfo_rec *rec,
			      ib_sa_comp_mask comp_mask, u8 method,
			      unsigned long timeout_ms, gfp_t gfp_mask,
			      void (*callback)(int status,
					       struct ib_sa_guidinfo_rec *resp,
					       void *context),
			      void *context,
			      struct ib_sa_query **sa_query)
{
	struct ib_sa_guidinfo_query *query;
	struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client);
	struct ib_sa_port *port;
	struct ib_mad_agent *agent;
	struct ib_sa_mad *mad;
	int ret;

	if (!sa_dev)
		return -ENODEV;

	if (method != IB_MGMT_METHOD_GET &&
	    method != IB_MGMT_METHOD_SET &&
	    method != IB_SA_METHOD_DELETE) {
		return -EINVAL;
	}

	port  = &sa_dev->port[port_num - sa_dev->start_port];
	agent = port->agent;

	query = kzalloc(sizeof(*query), gfp_mask);
	if (!query)
		return -ENOMEM;

	query->sa_query.port = port;
	ret = alloc_mad(&query->sa_query, gfp_mask);
	if (ret)
		goto err1;

	ib_sa_client_get(client);
	query->sa_query.client = client;
	query->callback        = callback;
	query->context         = context;

	mad = query->sa_query.mad_buf->mad;
	init_mad(&query->sa_query, agent);

	query->sa_query.callback = callback ? ib_sa_guidinfo_rec_callback : NULL;
	query->sa_query.release  = ib_sa_guidinfo_rec_release;

	mad->mad_hdr.method	 = method;
	mad->mad_hdr.attr_id	 = cpu_to_be16(IB_SA_ATTR_GUID_INFO_REC);
	mad->sa_hdr.comp_mask	 = comp_mask;

	ib_pack(guidinfo_rec_table, ARRAY_SIZE(guidinfo_rec_table), rec,
		mad->data);

	*sa_query = &query->sa_query;

	ret = send_mad(&query->sa_query, timeout_ms, gfp_mask);
	if (ret < 0)
		goto err2;

	return ret;

err2:
	*sa_query = NULL;
	ib_sa_client_put(query->sa_query.client);
	free_mad(&query->sa_query);

err1:
	kfree(query);
	return ret;
}
EXPORT_SYMBOL(ib_sa_guid_info_rec_query);

struct ib_classport_info_context {
	struct completion	done;
	struct ib_sa_query	*sa_query;
};

static void ib_classportinfo_cb(void *context)
{
	struct ib_classport_info_context *cb_ctx = context;

	complete(&cb_ctx->done);
}

static void ib_sa_classport_info_rec_callback(struct ib_sa_query *sa_query,
					      int status, struct ib_sa_mad *mad)
{
	unsigned long flags;
	struct ib_sa_classport_info_query *query =
		container_of(sa_query, struct ib_sa_classport_info_query, sa_query);
	struct ib_sa_classport_cache *info = &sa_query->port->classport_info;

	if (mad) {
		if (sa_query->flags & IB_SA_QUERY_OPA) {
			struct opa_class_port_info rec;

			ib_unpack(opa_classport_info_rec_table,
				  ARRAY_SIZE(opa_classport_info_rec_table),
				  mad->data, &rec);

			spin_lock_irqsave(&sa_query->port->classport_lock,
					  flags);
			if (!status && !info->valid) {
				memcpy(&info->data.opa, &rec,
				       sizeof(info->data.opa));

				info->valid = true;
				info->data.type = RDMA_CLASS_PORT_INFO_OPA;
			}
			spin_unlock_irqrestore(&sa_query->port->classport_lock,
					       flags);

		} else {
			struct ib_class_port_info rec;

			ib_unpack(ib_classport_info_rec_table,
				  ARRAY_SIZE(ib_classport_info_rec_table),
				  mad->data, &rec);

			spin_lock_irqsave(&sa_query->port->classport_lock,
					  flags);
			if (!status && !info->valid) {
				memcpy(&info->data.ib, &rec,
				       sizeof(info->data.ib));

				info->valid = true;
				info->data.type = RDMA_CLASS_PORT_INFO_IB;
			}
			spin_unlock_irqrestore(&sa_query->port->classport_lock,
					       flags);
		}
	}
	query->callback(query->context);
}

static void ib_sa_classport_info_rec_release(struct ib_sa_query *sa_query)
{
	kfree(container_of(sa_query, struct ib_sa_classport_info_query,
			   sa_query));
}

static int ib_sa_classport_info_rec_query(struct ib_sa_port *port,
					  unsigned long timeout_ms,
					  void (*callback)(void *context),
					  void *context,
					  struct ib_sa_query **sa_query)
{
	struct ib_mad_agent *agent;
	struct ib_sa_classport_info_query *query;
	struct ib_sa_mad *mad;
	gfp_t gfp_mask = GFP_KERNEL;
	int ret;

	agent = port->agent;

	query = kzalloc(sizeof(*query), gfp_mask);
	if (!query)
		return -ENOMEM;

	query->sa_query.port = port;
	query->sa_query.flags |= rdma_cap_opa_ah(port->agent->device,
						 port->port_num) ?
				 IB_SA_QUERY_OPA : 0;
	ret = alloc_mad(&query->sa_query, gfp_mask);
	if (ret)
		goto err_free;

	query->callback = callback;
	query->context = context;

	mad = query->sa_query.mad_buf->mad;
	init_mad(&query->sa_query, agent);

	query->sa_query.callback = ib_sa_classport_info_rec_callback;
	query->sa_query.release  = ib_sa_classport_info_rec_release;
	mad->mad_hdr.method	 = IB_MGMT_METHOD_GET;
	mad->mad_hdr.attr_id	 = cpu_to_be16(IB_SA_ATTR_CLASS_PORTINFO);
	mad->sa_hdr.comp_mask	 = 0;
	*sa_query = &query->sa_query;

	ret = send_mad(&query->sa_query, timeout_ms, gfp_mask);
	if (ret < 0)
		goto err_free_mad;

	return ret;

err_free_mad:
	*sa_query = NULL;
	free_mad(&query->sa_query);

err_free:
	kfree(query);
	return ret;
}

static void update_ib_cpi(struct work_struct *work)
{
	struct ib_sa_port *port =
		container_of(work, struct ib_sa_port, ib_cpi_work.work);
	struct ib_classport_info_context *cb_context;
	unsigned long flags;
	int ret;

	/* If the classport info is valid, nothing
	 * to do here.
	 */
	spin_lock_irqsave(&port->classport_lock, flags);
	if (port->classport_info.valid) {
		spin_unlock_irqrestore(&port->classport_lock, flags);
		return;
	}
	spin_unlock_irqrestore(&port->classport_lock, flags);

	cb_context = kmalloc(sizeof(*cb_context), GFP_KERNEL);
	if (!cb_context)
		goto err_nomem;

	init_completion(&cb_context->done);

	ret = ib_sa_classport_info_rec_query(port, 3000,
					     ib_classportinfo_cb, cb_context,
					     &cb_context->sa_query);
	if (ret < 0)
		goto free_cb_err;
	wait_for_completion(&cb_context->done);
free_cb_err:
	kfree(cb_context);
	spin_lock_irqsave(&port->classport_lock, flags);

	/* If the classport info is still not valid, the query should have
	 * failed for some reason. Retry issuing the query
	 */
	if (!port->classport_info.valid) {
		port->classport_info.retry_cnt++;
		if (port->classport_info.retry_cnt <=
		    IB_SA_CPI_MAX_RETRY_CNT) {
			unsigned long delay =
				msecs_to_jiffies(IB_SA_CPI_RETRY_WAIT);

			queue_delayed_work(ib_wq, &port->ib_cpi_work, delay);
		}
	}
	spin_unlock_irqrestore(&port->classport_lock, flags);

err_nomem:
	return;
}

static void send_handler(struct ib_mad_agent *agent,
			 struct ib_mad_send_wc *mad_send_wc)
{
	struct ib_sa_query *query = mad_send_wc->send_buf->context[0];
	unsigned long flags;

	if (query->callback)
		switch (mad_send_wc->status) {
		case IB_WC_SUCCESS:
			/* No callback -- already got recv */
			break;
		case IB_WC_RESP_TIMEOUT_ERR:
			query->callback(query, -ETIMEDOUT, NULL);
			break;
		case IB_WC_WR_FLUSH_ERR:
			query->callback(query, -EINTR, NULL);
			break;
		default:
			query->callback(query, -EIO, NULL);
			break;
		}

	xa_lock_irqsave(&queries, flags);
	__xa_erase(&queries, query->id);
	xa_unlock_irqrestore(&queries, flags);

	free_mad(query);
	if (query->client)
		ib_sa_client_put(query->client);
	query->release(query);
}

static void recv_handler(struct ib_mad_agent *mad_agent,
			 struct ib_mad_send_buf *send_buf,
			 struct ib_mad_recv_wc *mad_recv_wc)
{
	struct ib_sa_query *query;

	if (!send_buf)
		return;

	query = send_buf->context[0];
	if (query->callback) {
		if (mad_recv_wc->wc->status == IB_WC_SUCCESS)
			query->callback(query,
					mad_recv_wc->recv_buf.mad->mad_hdr.status ?
					-EINVAL : 0,
					(struct ib_sa_mad *) mad_recv_wc->recv_buf.mad);
		else
			query->callback(query, -EIO, NULL);
	}

	ib_free_recv_mad(mad_recv_wc);
}

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;
	struct ib_port_attr port_attr;
	struct rdma_ah_attr   ah_attr;
	bool grh_required;

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

	new_ah = kmalloc(sizeof(*new_ah), GFP_KERNEL);
	if (!new_ah)
		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))
		pr_err("Couldn't find index for default PKey\n");

	memset(&ah_attr, 0, sizeof(ah_attr));
	ah_attr.type = rdma_ah_find_type(port->agent->device,
					 port->port_num);
	rdma_ah_set_dlid(&ah_attr, port_attr.sm_lid);
	rdma_ah_set_sl(&ah_attr, port_attr.sm_sl);
	rdma_ah_set_port_num(&ah_attr, port->port_num);

	grh_required = rdma_is_grh_required(port->agent->device,
					    port->port_num);

	/*
	 * The OPA sm_lid of 0xFFFF needs special handling so that it can be
	 * differentiated from a permissive LID of 0xFFFF.  We set the
	 * grh_required flag here so the SA can program the DGID in the
	 * address handle appropriately
	 */
	if (ah_attr.type == RDMA_AH_ATTR_TYPE_OPA &&
	    (grh_required ||
	     port_attr.sm_lid == be16_to_cpu(IB_LID_PERMISSIVE)))
		rdma_ah_set_make_grd(&ah_attr, true);

	if (ah_attr.type == RDMA_AH_ATTR_TYPE_IB && grh_required) {
		rdma_ah_set_ah_flags(&ah_attr, IB_AH_GRH);
		rdma_ah_set_subnet_prefix(&ah_attr,
					  cpu_to_be64(port_attr.subnet_prefix));
		rdma_ah_set_interface_id(&ah_attr,
					 cpu_to_be64(IB_SA_WELL_KNOWN_GUID));
	}

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

	spin_lock_irq(&port->ah_lock);
	if (port->sm_ah)
		kref_put(&port->sm_ah->ref, free_sm_ah);
	port->sm_ah = new_ah;
	spin_unlock_irq(&port->ah_lock);
}

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) {
		unsigned long flags;
		struct ib_sa_device *sa_dev =
			container_of(handler, typeof(*sa_dev), event_handler);
		u32 port_num = event->element.port_num - sa_dev->start_port;
		struct ib_sa_port *port = &sa_dev->port[port_num];

		if (!rdma_cap_ib_sa(handler->device, port->port_num))
			return;

		spin_lock_irqsave(&port->ah_lock, flags);
		if (port->sm_ah)
			kref_put(&port->sm_ah->ref, free_sm_ah);
		port->sm_ah = NULL;
		spin_unlock_irqrestore(&port->ah_lock, flags);

		if (event->event == IB_EVENT_SM_CHANGE ||
		    event->event == IB_EVENT_CLIENT_REREGISTER ||
		    event->event == IB_EVENT_LID_CHANGE ||
		    event->event == IB_EVENT_PORT_ACTIVE) {
			unsigned long delay =
				msecs_to_jiffies(IB_SA_CPI_RETRY_WAIT);

			spin_lock_irqsave(&port->classport_lock, flags);
			port->classport_info.valid = false;
			port->classport_info.retry_cnt = 0;
			spin_unlock_irqrestore(&port->classport_lock, flags);
			queue_delayed_work(ib_wq,
					   &port->ib_cpi_work, delay);
		}
		queue_work(ib_wq, &sa_dev->port[port_num].update_task);
	}
}

static int ib_sa_add_one(struct ib_device *device)
{
	struct ib_sa_device *sa_dev;
	int s, e, i;
	int count = 0;
	int ret;

	s = rdma_start_port(device);
	e = rdma_end_port(device);

	sa_dev = kzalloc(struct_size(sa_dev, port,
				     size_add(size_sub(e, s), 1)),
			 GFP_KERNEL);
	if (!sa_dev)
		return -ENOMEM;

	sa_dev->start_port = s;
	sa_dev->end_port   = e;

	for (i = 0; i <= e - s; ++i) {
		spin_lock_init(&sa_dev->port[i].ah_lock);
		if (!rdma_cap_ib_sa(device, i + 1))
			continue;

		sa_dev->port[i].sm_ah    = NULL;
		sa_dev->port[i].port_num = i + s;

		spin_lock_init(&sa_dev->port[i].classport_lock);
		sa_dev->port[i].classport_info.valid = false;

		sa_dev->port[i].agent =
			ib_register_mad_agent(device, i + s, IB_QPT_GSI,
					      NULL, 0, send_handler,
					      recv_handler, sa_dev, 0);
		if (IS_ERR(sa_dev->port[i].agent)) {
			ret = PTR_ERR(sa_dev->port[i].agent);
			goto err;
		}

		INIT_WORK(&sa_dev->port[i].update_task, update_sm_ah);
		INIT_DELAYED_WORK(&sa_dev->port[i].ib_cpi_work,
				  update_ib_cpi);

		count++;
	}

	if (!count) {
		ret = -EOPNOTSUPP;
		goto free;
	}

	ib_set_client_data(device, &sa_client, sa_dev);

	/*
	 * We register our event handler after everything is set up,
	 * and then update our cached info after the event handler is
	 * registered to avoid any problems if a port changes state
	 * during our initialization.
	 */

	INIT_IB_EVENT_HANDLER(&sa_dev->event_handler, device, ib_sa_event);
	ib_register_event_handler(&sa_dev->event_handler);

	for (i = 0; i <= e - s; ++i) {
		if (rdma_cap_ib_sa(device, i + 1))
			update_sm_ah(&sa_dev->port[i].update_task);
	}

	return 0;

err:
	while (--i >= 0) {
		if (rdma_cap_ib_sa(device, i + 1))
			ib_unregister_mad_agent(sa_dev->port[i].agent);
	}
free:
	kfree(sa_dev);
	return ret;
}

static void ib_sa_remove_one(struct ib_device *device, void *client_data)
{
	struct ib_sa_device *sa_dev = client_data;
	int i;

	ib_unregister_event_handler(&sa_dev->event_handler);
	flush_workqueue(ib_wq);

	for (i = 0; i <= sa_dev->end_port - sa_dev->start_port; ++i) {
		if (rdma_cap_ib_sa(device, i + 1)) {
			cancel_delayed_work_sync(&sa_dev->port[i].ib_cpi_work);
			ib_unregister_mad_agent(sa_dev->port[i].agent);
			if (sa_dev->port[i].sm_ah)
				kref_put(&sa_dev->port[i].sm_ah->ref, free_sm_ah);
		}

	}

	kfree(sa_dev);
}

int ib_sa_init(void)
{
	int ret;

	get_random_bytes(&tid, sizeof tid);

	atomic_set(&ib_nl_sa_request_seq, 0);

	ret = ib_register_client(&sa_client);
	if (ret) {
		pr_err("Couldn't register ib_sa client\n");
		goto err1;
	}

	ret = mcast_init();
	if (ret) {
		pr_err("Couldn't initialize multicast handling\n");
		goto err2;
	}

	ib_nl_wq = alloc_ordered_workqueue("ib_nl_sa_wq", WQ_MEM_RECLAIM);
	if (!ib_nl_wq) {
		ret = -ENOMEM;
		goto err3;
	}

	INIT_DELAYED_WORK(&ib_nl_timed_work, ib_nl_request_timeout);

	return 0;

err3:
	mcast_cleanup();
err2:
	ib_unregister_client(&sa_client);
err1:
	return ret;
}

void ib_sa_cleanup(void)
{
	cancel_delayed_work(&ib_nl_timed_work);
	destroy_workqueue(ib_nl_wq);
	mcast_cleanup();
	ib_unregister_client(&sa_client);
	WARN_ON(!xa_empty(&queries));
}