ib_srp.c 72.6 KB
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/*
 * Copyright (c) 2005 Cisco Systems.  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.
 */

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#define pr_fmt(fmt) PFX fmt

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#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/err.h>
#include <linux/string.h>
#include <linux/parser.h>
#include <linux/random.h>
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#include <linux/jiffies.h>
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Arun Sharma 已提交
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#include <linux/atomic.h>
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#include <scsi/scsi.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_dbg.h>
#include <scsi/srp.h>
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#include <scsi/scsi_transport_srp.h>
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#include "ib_srp.h"

#define DRV_NAME	"ib_srp"
#define PFX		DRV_NAME ": "
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#define DRV_VERSION	"1.0"
#define DRV_RELDATE	"July 1, 2013"
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MODULE_AUTHOR("Roland Dreier");
MODULE_DESCRIPTION("InfiniBand SCSI RDMA Protocol initiator "
		   "v" DRV_VERSION " (" DRV_RELDATE ")");
MODULE_LICENSE("Dual BSD/GPL");

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static unsigned int srp_sg_tablesize;
static unsigned int cmd_sg_entries;
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static unsigned int indirect_sg_entries;
static bool allow_ext_sg;
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static int topspin_workarounds = 1;
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module_param(srp_sg_tablesize, uint, 0444);
MODULE_PARM_DESC(srp_sg_tablesize, "Deprecated name for cmd_sg_entries");
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module_param(cmd_sg_entries, uint, 0444);
MODULE_PARM_DESC(cmd_sg_entries,
		 "Default number of gather/scatter entries in the SRP command (default is 12, max 255)");
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module_param(indirect_sg_entries, uint, 0444);
MODULE_PARM_DESC(indirect_sg_entries,
		 "Default max number of gather/scatter entries (default is 12, max is " __stringify(SCSI_MAX_SG_CHAIN_SEGMENTS) ")");

module_param(allow_ext_sg, bool, 0444);
MODULE_PARM_DESC(allow_ext_sg,
		  "Default behavior when there are more than cmd_sg_entries S/G entries after mapping; fails the request when false (default false)");

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module_param(topspin_workarounds, int, 0444);
MODULE_PARM_DESC(topspin_workarounds,
		 "Enable workarounds for Topspin/Cisco SRP target bugs if != 0");

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static struct kernel_param_ops srp_tmo_ops;

static int srp_fast_io_fail_tmo = 15;
module_param_cb(fast_io_fail_tmo, &srp_tmo_ops, &srp_fast_io_fail_tmo,
		S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(fast_io_fail_tmo,
		 "Number of seconds between the observation of a transport"
		 " layer error and failing all I/O. \"off\" means that this"
		 " functionality is disabled.");

static int srp_dev_loss_tmo = 60;
module_param_cb(dev_loss_tmo, &srp_tmo_ops, &srp_dev_loss_tmo,
		S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(dev_loss_tmo,
		 "Maximum number of seconds that the SRP transport should"
		 " insulate transport layer errors. After this time has been"
		 " exceeded the SCSI host is removed. Should be"
		 " between 1 and " __stringify(SCSI_DEVICE_BLOCK_MAX_TIMEOUT)
		 " if fast_io_fail_tmo has not been set. \"off\" means that"
		 " this functionality is disabled.");

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static void srp_add_one(struct ib_device *device);
static void srp_remove_one(struct ib_device *device);
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static void srp_recv_completion(struct ib_cq *cq, void *target_ptr);
static void srp_send_completion(struct ib_cq *cq, void *target_ptr);
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static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event);

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static struct scsi_transport_template *ib_srp_transport_template;

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static struct ib_client srp_client = {
	.name   = "srp",
	.add    = srp_add_one,
	.remove = srp_remove_one
};

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static struct ib_sa_client srp_sa_client;

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static int srp_tmo_get(char *buffer, const struct kernel_param *kp)
{
	int tmo = *(int *)kp->arg;

	if (tmo >= 0)
		return sprintf(buffer, "%d", tmo);
	else
		return sprintf(buffer, "off");
}

static int srp_tmo_set(const char *val, const struct kernel_param *kp)
{
	int tmo, res;

	if (strncmp(val, "off", 3) != 0) {
		res = kstrtoint(val, 0, &tmo);
		if (res)
			goto out;
	} else {
		tmo = -1;
	}
	if (kp->arg == &srp_fast_io_fail_tmo)
		res = srp_tmo_valid(tmo, srp_dev_loss_tmo);
	else
		res = srp_tmo_valid(srp_fast_io_fail_tmo, tmo);
	if (res)
		goto out;
	*(int *)kp->arg = tmo;

out:
	return res;
}

static struct kernel_param_ops srp_tmo_ops = {
	.get = srp_tmo_get,
	.set = srp_tmo_set,
};

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static inline struct srp_target_port *host_to_target(struct Scsi_Host *host)
{
	return (struct srp_target_port *) host->hostdata;
}

static const char *srp_target_info(struct Scsi_Host *host)
{
	return host_to_target(host)->target_name;
}

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static int srp_target_is_topspin(struct srp_target_port *target)
{
	static const u8 topspin_oui[3] = { 0x00, 0x05, 0xad };
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	static const u8 cisco_oui[3]   = { 0x00, 0x1b, 0x0d };
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	return topspin_workarounds &&
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		(!memcmp(&target->ioc_guid, topspin_oui, sizeof topspin_oui) ||
		 !memcmp(&target->ioc_guid, cisco_oui, sizeof cisco_oui));
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}

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static struct srp_iu *srp_alloc_iu(struct srp_host *host, size_t size,
				   gfp_t gfp_mask,
				   enum dma_data_direction direction)
{
	struct srp_iu *iu;

	iu = kmalloc(sizeof *iu, gfp_mask);
	if (!iu)
		goto out;

	iu->buf = kzalloc(size, gfp_mask);
	if (!iu->buf)
		goto out_free_iu;

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	iu->dma = ib_dma_map_single(host->srp_dev->dev, iu->buf, size,
				    direction);
	if (ib_dma_mapping_error(host->srp_dev->dev, iu->dma))
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		goto out_free_buf;

	iu->size      = size;
	iu->direction = direction;

	return iu;

out_free_buf:
	kfree(iu->buf);
out_free_iu:
	kfree(iu);
out:
	return NULL;
}

static void srp_free_iu(struct srp_host *host, struct srp_iu *iu)
{
	if (!iu)
		return;

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	ib_dma_unmap_single(host->srp_dev->dev, iu->dma, iu->size,
			    iu->direction);
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	kfree(iu->buf);
	kfree(iu);
}

static void srp_qp_event(struct ib_event *event, void *context)
{
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	pr_debug("QP event %d\n", event->event);
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}

static int srp_init_qp(struct srp_target_port *target,
		       struct ib_qp *qp)
{
	struct ib_qp_attr *attr;
	int ret;

	attr = kmalloc(sizeof *attr, GFP_KERNEL);
	if (!attr)
		return -ENOMEM;

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	ret = ib_find_pkey(target->srp_host->srp_dev->dev,
			   target->srp_host->port,
			   be16_to_cpu(target->path.pkey),
			   &attr->pkey_index);
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	if (ret)
		goto out;

	attr->qp_state        = IB_QPS_INIT;
	attr->qp_access_flags = (IB_ACCESS_REMOTE_READ |
				    IB_ACCESS_REMOTE_WRITE);
	attr->port_num        = target->srp_host->port;

	ret = ib_modify_qp(qp, attr,
			   IB_QP_STATE		|
			   IB_QP_PKEY_INDEX	|
			   IB_QP_ACCESS_FLAGS	|
			   IB_QP_PORT);

out:
	kfree(attr);
	return ret;
}

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static int srp_new_cm_id(struct srp_target_port *target)
{
	struct ib_cm_id *new_cm_id;

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	new_cm_id = ib_create_cm_id(target->srp_host->srp_dev->dev,
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				    srp_cm_handler, target);
	if (IS_ERR(new_cm_id))
		return PTR_ERR(new_cm_id);

	if (target->cm_id)
		ib_destroy_cm_id(target->cm_id);
	target->cm_id = new_cm_id;

	return 0;
}

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static int srp_create_target_ib(struct srp_target_port *target)
{
	struct ib_qp_init_attr *init_attr;
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	struct ib_cq *recv_cq, *send_cq;
	struct ib_qp *qp;
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	int ret;

	init_attr = kzalloc(sizeof *init_attr, GFP_KERNEL);
	if (!init_attr)
		return -ENOMEM;

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	recv_cq = ib_create_cq(target->srp_host->srp_dev->dev,
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			       srp_recv_completion, NULL, target, SRP_RQ_SIZE,
			       target->comp_vector);
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	if (IS_ERR(recv_cq)) {
		ret = PTR_ERR(recv_cq);
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		goto err;
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	}

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	send_cq = ib_create_cq(target->srp_host->srp_dev->dev,
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			       srp_send_completion, NULL, target, SRP_SQ_SIZE,
			       target->comp_vector);
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	if (IS_ERR(send_cq)) {
		ret = PTR_ERR(send_cq);
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		goto err_recv_cq;
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	}

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	ib_req_notify_cq(recv_cq, IB_CQ_NEXT_COMP);
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	init_attr->event_handler       = srp_qp_event;
	init_attr->cap.max_send_wr     = SRP_SQ_SIZE;
	init_attr->cap.max_recv_wr     = SRP_RQ_SIZE;
	init_attr->cap.max_recv_sge    = 1;
	init_attr->cap.max_send_sge    = 1;
	init_attr->sq_sig_type         = IB_SIGNAL_ALL_WR;
	init_attr->qp_type             = IB_QPT_RC;
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	init_attr->send_cq             = send_cq;
	init_attr->recv_cq             = recv_cq;
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	qp = ib_create_qp(target->srp_host->srp_dev->pd, init_attr);
	if (IS_ERR(qp)) {
		ret = PTR_ERR(qp);
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		goto err_send_cq;
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	}

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	ret = srp_init_qp(target, qp);
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	if (ret)
		goto err_qp;
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	if (target->qp)
		ib_destroy_qp(target->qp);
	if (target->recv_cq)
		ib_destroy_cq(target->recv_cq);
	if (target->send_cq)
		ib_destroy_cq(target->send_cq);

	target->qp = qp;
	target->recv_cq = recv_cq;
	target->send_cq = send_cq;

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	kfree(init_attr);
	return 0;

err_qp:
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	ib_destroy_qp(qp);
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err_send_cq:
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	ib_destroy_cq(send_cq);
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err_recv_cq:
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	ib_destroy_cq(recv_cq);
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err:
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	kfree(init_attr);
	return ret;
}

static void srp_free_target_ib(struct srp_target_port *target)
{
	int i;

	ib_destroy_qp(target->qp);
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	ib_destroy_cq(target->send_cq);
	ib_destroy_cq(target->recv_cq);
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	target->qp = NULL;
	target->send_cq = target->recv_cq = NULL;

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	for (i = 0; i < SRP_RQ_SIZE; ++i)
		srp_free_iu(target->srp_host, target->rx_ring[i]);
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	for (i = 0; i < SRP_SQ_SIZE; ++i)
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		srp_free_iu(target->srp_host, target->tx_ring[i]);
}

static void srp_path_rec_completion(int status,
				    struct ib_sa_path_rec *pathrec,
				    void *target_ptr)
{
	struct srp_target_port *target = target_ptr;

	target->status = status;
	if (status)
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		shost_printk(KERN_ERR, target->scsi_host,
			     PFX "Got failed path rec status %d\n", status);
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	else
		target->path = *pathrec;
	complete(&target->done);
}

static int srp_lookup_path(struct srp_target_port *target)
{
	target->path.numb_path = 1;

	init_completion(&target->done);

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	target->path_query_id = ib_sa_path_rec_get(&srp_sa_client,
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						   target->srp_host->srp_dev->dev,
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						   target->srp_host->port,
						   &target->path,
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						   IB_SA_PATH_REC_SERVICE_ID	|
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						   IB_SA_PATH_REC_DGID		|
						   IB_SA_PATH_REC_SGID		|
						   IB_SA_PATH_REC_NUMB_PATH	|
						   IB_SA_PATH_REC_PKEY,
						   SRP_PATH_REC_TIMEOUT_MS,
						   GFP_KERNEL,
						   srp_path_rec_completion,
						   target, &target->path_query);
	if (target->path_query_id < 0)
		return target->path_query_id;

	wait_for_completion(&target->done);

	if (target->status < 0)
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		shost_printk(KERN_WARNING, target->scsi_host,
			     PFX "Path record query failed\n");
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	return target->status;
}

static int srp_send_req(struct srp_target_port *target)
{
	struct {
		struct ib_cm_req_param param;
		struct srp_login_req   priv;
	} *req = NULL;
	int status;

	req = kzalloc(sizeof *req, GFP_KERNEL);
	if (!req)
		return -ENOMEM;

	req->param.primary_path 	      = &target->path;
	req->param.alternate_path 	      = NULL;
	req->param.service_id 		      = target->service_id;
	req->param.qp_num 		      = target->qp->qp_num;
	req->param.qp_type 		      = target->qp->qp_type;
	req->param.private_data 	      = &req->priv;
	req->param.private_data_len 	      = sizeof req->priv;
	req->param.flow_control 	      = 1;

	get_random_bytes(&req->param.starting_psn, 4);
	req->param.starting_psn 	     &= 0xffffff;

	/*
	 * Pick some arbitrary defaults here; we could make these
	 * module parameters if anyone cared about setting them.
	 */
	req->param.responder_resources	      = 4;
	req->param.remote_cm_response_timeout = 20;
	req->param.local_cm_response_timeout  = 20;
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	req->param.retry_count                = target->tl_retry_count;
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	req->param.rnr_retry_count 	      = 7;
	req->param.max_cm_retries 	      = 15;

	req->priv.opcode     	= SRP_LOGIN_REQ;
	req->priv.tag        	= 0;
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	req->priv.req_it_iu_len = cpu_to_be32(target->max_iu_len);
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	req->priv.req_buf_fmt 	= cpu_to_be16(SRP_BUF_FORMAT_DIRECT |
					      SRP_BUF_FORMAT_INDIRECT);
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	/*
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Roland Dreier 已提交
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	 * In the published SRP specification (draft rev. 16a), the
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	 * port identifier format is 8 bytes of ID extension followed
	 * by 8 bytes of GUID.  Older drafts put the two halves in the
	 * opposite order, so that the GUID comes first.
	 *
	 * Targets conforming to these obsolete drafts can be
	 * recognized by the I/O Class they report.
	 */
	if (target->io_class == SRP_REV10_IB_IO_CLASS) {
		memcpy(req->priv.initiator_port_id,
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		       &target->path.sgid.global.interface_id, 8);
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		memcpy(req->priv.initiator_port_id + 8,
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		       &target->initiator_ext, 8);
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		memcpy(req->priv.target_port_id,     &target->ioc_guid, 8);
		memcpy(req->priv.target_port_id + 8, &target->id_ext, 8);
	} else {
		memcpy(req->priv.initiator_port_id,
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		       &target->initiator_ext, 8);
		memcpy(req->priv.initiator_port_id + 8,
		       &target->path.sgid.global.interface_id, 8);
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		memcpy(req->priv.target_port_id,     &target->id_ext, 8);
		memcpy(req->priv.target_port_id + 8, &target->ioc_guid, 8);
	}

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	/*
	 * Topspin/Cisco SRP targets will reject our login unless we
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	 * zero out the first 8 bytes of our initiator port ID and set
	 * the second 8 bytes to the local node GUID.
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	 */
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	if (srp_target_is_topspin(target)) {
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		shost_printk(KERN_DEBUG, target->scsi_host,
			     PFX "Topspin/Cisco initiator port ID workaround "
			     "activated for target GUID %016llx\n",
			     (unsigned long long) be64_to_cpu(target->ioc_guid));
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		memset(req->priv.initiator_port_id, 0, 8);
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		memcpy(req->priv.initiator_port_id + 8,
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		       &target->srp_host->srp_dev->dev->node_guid, 8);
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	}

	status = ib_send_cm_req(target->cm_id, &req->param);

	kfree(req);

	return status;
}

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static bool srp_queue_remove_work(struct srp_target_port *target)
{
	bool changed = false;

	spin_lock_irq(&target->lock);
	if (target->state != SRP_TARGET_REMOVED) {
		target->state = SRP_TARGET_REMOVED;
		changed = true;
	}
	spin_unlock_irq(&target->lock);

	if (changed)
		queue_work(system_long_wq, &target->remove_work);

	return changed;
}

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static bool srp_change_conn_state(struct srp_target_port *target,
				  bool connected)
{
	bool changed = false;

	spin_lock_irq(&target->lock);
	if (target->connected != connected) {
		target->connected = connected;
		changed = true;
	}
	spin_unlock_irq(&target->lock);

	return changed;
}

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static void srp_disconnect_target(struct srp_target_port *target)
{
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	if (srp_change_conn_state(target, false)) {
		/* XXX should send SRP_I_LOGOUT request */
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		if (ib_send_cm_dreq(target->cm_id, NULL, 0)) {
			shost_printk(KERN_DEBUG, target->scsi_host,
				     PFX "Sending CM DREQ failed\n");
		}
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	}
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}

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static void srp_free_req_data(struct srp_target_port *target)
{
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	struct ib_device *ibdev = target->srp_host->srp_dev->dev;
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	struct srp_request *req;
	int i;

	for (i = 0, req = target->req_ring; i < SRP_CMD_SQ_SIZE; ++i, ++req) {
		kfree(req->fmr_list);
		kfree(req->map_page);
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		if (req->indirect_dma_addr) {
			ib_dma_unmap_single(ibdev, req->indirect_dma_addr,
					    target->indirect_size,
					    DMA_TO_DEVICE);
		}
		kfree(req->indirect_desc);
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	}
}

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/**
 * srp_del_scsi_host_attr() - Remove attributes defined in the host template.
 * @shost: SCSI host whose attributes to remove from sysfs.
 *
 * Note: Any attributes defined in the host template and that did not exist
 * before invocation of this function will be ignored.
 */
static void srp_del_scsi_host_attr(struct Scsi_Host *shost)
{
	struct device_attribute **attr;

	for (attr = shost->hostt->shost_attrs; attr && *attr; ++attr)
		device_remove_file(&shost->shost_dev, *attr);
}

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static void srp_remove_target(struct srp_target_port *target)
{
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	WARN_ON_ONCE(target->state != SRP_TARGET_REMOVED);

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	srp_del_scsi_host_attr(target->scsi_host);
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	srp_rport_get(target->rport);
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	srp_remove_host(target->scsi_host);
	scsi_remove_host(target->scsi_host);
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	srp_disconnect_target(target);
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	ib_destroy_cm_id(target->cm_id);
	srp_free_target_ib(target);
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	cancel_work_sync(&target->tl_err_work);
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	srp_rport_put(target->rport);
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	srp_free_req_data(target);
	scsi_host_put(target->scsi_host);
}

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David Howells 已提交
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static void srp_remove_work(struct work_struct *work)
603
{
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David Howells 已提交
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	struct srp_target_port *target =
605
		container_of(work, struct srp_target_port, remove_work);
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607
	WARN_ON_ONCE(target->state != SRP_TARGET_REMOVED);
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	srp_remove_target(target);

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	spin_lock(&target->srp_host->target_lock);
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	list_del(&target->list);
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	spin_unlock(&target->srp_host->target_lock);
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}

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static void srp_rport_delete(struct srp_rport *rport)
{
	struct srp_target_port *target = rport->lld_data;

	srp_queue_remove_work(target);
}

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static int srp_connect_target(struct srp_target_port *target)
{
D
David Dillow 已提交
625
	int retries = 3;
626 627
	int ret;

628 629
	WARN_ON_ONCE(target->connected);

630 631
	target->qp_in_error = false;

632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650
	ret = srp_lookup_path(target);
	if (ret)
		return ret;

	while (1) {
		init_completion(&target->done);
		ret = srp_send_req(target);
		if (ret)
			return ret;
		wait_for_completion(&target->done);

		/*
		 * The CM event handling code will set status to
		 * SRP_PORT_REDIRECT if we get a port redirect REJ
		 * back, or SRP_DLID_REDIRECT if we get a lid/qp
		 * redirect REJ back.
		 */
		switch (target->status) {
		case 0:
651
			srp_change_conn_state(target, true);
652 653 654 655 656 657 658 659 660 661 662
			return 0;

		case SRP_PORT_REDIRECT:
			ret = srp_lookup_path(target);
			if (ret)
				return ret;
			break;

		case SRP_DLID_REDIRECT:
			break;

D
David Dillow 已提交
663 664 665 666 667 668 669 670 671 672 673 674 675 676 677
		case SRP_STALE_CONN:
			/* Our current CM id was stale, and is now in timewait.
			 * Try to reconnect with a new one.
			 */
			if (!retries-- || srp_new_cm_id(target)) {
				shost_printk(KERN_ERR, target->scsi_host, PFX
					     "giving up on stale connection\n");
				target->status = -ECONNRESET;
				return target->status;
			}

			shost_printk(KERN_ERR, target->scsi_host, PFX
				     "retrying stale connection\n");
			break;

678 679 680 681 682 683
		default:
			return target->status;
		}
	}
}

684 685 686 687
static void srp_unmap_data(struct scsi_cmnd *scmnd,
			   struct srp_target_port *target,
			   struct srp_request *req)
{
688 689 690
	struct ib_device *ibdev = target->srp_host->srp_dev->dev;
	struct ib_pool_fmr **pfmr;

691
	if (!scsi_sglist(scmnd) ||
692 693 694 695
	    (scmnd->sc_data_direction != DMA_TO_DEVICE &&
	     scmnd->sc_data_direction != DMA_FROM_DEVICE))
		return;

696 697 698
	pfmr = req->fmr_list;
	while (req->nfmr--)
		ib_fmr_pool_unmap(*pfmr++);
699

700 701
	ib_dma_unmap_sg(ibdev, scsi_sglist(scmnd), scsi_sg_count(scmnd),
			scmnd->sc_data_direction);
702 703
}

B
Bart Van Assche 已提交
704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739
/**
 * srp_claim_req - Take ownership of the scmnd associated with a request.
 * @target: SRP target port.
 * @req: SRP request.
 * @scmnd: If NULL, take ownership of @req->scmnd. If not NULL, only take
 *         ownership of @req->scmnd if it equals @scmnd.
 *
 * Return value:
 * Either NULL or a pointer to the SCSI command the caller became owner of.
 */
static struct scsi_cmnd *srp_claim_req(struct srp_target_port *target,
				       struct srp_request *req,
				       struct scsi_cmnd *scmnd)
{
	unsigned long flags;

	spin_lock_irqsave(&target->lock, flags);
	if (!scmnd) {
		scmnd = req->scmnd;
		req->scmnd = NULL;
	} else if (req->scmnd == scmnd) {
		req->scmnd = NULL;
	} else {
		scmnd = NULL;
	}
	spin_unlock_irqrestore(&target->lock, flags);

	return scmnd;
}

/**
 * srp_free_req() - Unmap data and add request to the free request list.
 */
static void srp_free_req(struct srp_target_port *target,
			 struct srp_request *req, struct scsi_cmnd *scmnd,
			 s32 req_lim_delta)
740
{
741 742
	unsigned long flags;

B
Bart Van Assche 已提交
743 744
	srp_unmap_data(scmnd, target, req);

745
	spin_lock_irqsave(&target->lock, flags);
746
	target->req_lim += req_lim_delta;
747
	list_add_tail(&req->list, &target->free_reqs);
748
	spin_unlock_irqrestore(&target->lock, flags);
749 750
}

751 752
static void srp_finish_req(struct srp_target_port *target,
			   struct srp_request *req, int result)
753
{
B
Bart Van Assche 已提交
754 755 756
	struct scsi_cmnd *scmnd = srp_claim_req(target, req, NULL);

	if (scmnd) {
757
		srp_free_req(target, req, scmnd, 0);
758
		scmnd->result = result;
B
Bart Van Assche 已提交
759 760
		scmnd->scsi_done(scmnd);
	}
761 762
}

763
static void srp_terminate_io(struct srp_rport *rport)
764
{
765 766 767 768 769 770 771 772
	struct srp_target_port *target = rport->lld_data;
	int i;

	for (i = 0; i < SRP_CMD_SQ_SIZE; ++i) {
		struct srp_request *req = &target->req_ring[i];
		srp_finish_req(target, req, DID_TRANSPORT_FAILFAST << 16);
	}
}
773

774 775 776 777 778 779 780 781 782 783 784 785 786
/*
 * It is up to the caller to ensure that srp_rport_reconnect() calls are
 * serialized and that no concurrent srp_queuecommand(), srp_abort(),
 * srp_reset_device() or srp_reset_host() calls will occur while this function
 * is in progress. One way to realize that is not to call this function
 * directly but to call srp_reconnect_rport() instead since that last function
 * serializes calls of this function via rport->mutex and also blocks
 * srp_queuecommand() calls before invoking this function.
 */
static int srp_rport_reconnect(struct srp_rport *rport)
{
	struct srp_target_port *target = rport->lld_data;
	int i, ret;
787

788 789
	srp_disconnect_target(target);
	/*
790 791 792
	 * Now get a new local CM ID so that we avoid confusing the target in
	 * case things are really fouled up. Doing so also ensures that all CM
	 * callbacks will have finished before a new QP is allocated.
793
	 */
D
David Dillow 已提交
794
	ret = srp_new_cm_id(target);
795 796 797 798 799 800 801 802 803
	/*
	 * Whether or not creating a new CM ID succeeded, create a new
	 * QP. This guarantees that all completion callback function
	 * invocations have finished before request resetting starts.
	 */
	if (ret == 0)
		ret = srp_create_target_ib(target);
	else
		srp_create_target_ib(target);
804

805 806
	for (i = 0; i < SRP_CMD_SQ_SIZE; ++i) {
		struct srp_request *req = &target->req_ring[i];
807
		srp_finish_req(target, req, DID_RESET << 16);
808
	}
809

810
	INIT_LIST_HEAD(&target->free_tx);
811
	for (i = 0; i < SRP_SQ_SIZE; ++i)
812
		list_add(&target->tx_ring[i]->list, &target->free_tx);
813

814 815
	if (ret == 0)
		ret = srp_connect_target(target);
816

817 818 819
	if (ret == 0)
		shost_printk(KERN_INFO, target->scsi_host,
			     PFX "reconnect succeeded\n");
820 821 822 823

	return ret;
}

824 825
static void srp_map_desc(struct srp_map_state *state, dma_addr_t dma_addr,
			 unsigned int dma_len, u32 rkey)
826
{
827
	struct srp_direct_buf *desc = state->desc;
828

829 830 831
	desc->va = cpu_to_be64(dma_addr);
	desc->key = cpu_to_be32(rkey);
	desc->len = cpu_to_be32(dma_len);
832

833 834 835 836
	state->total_len += dma_len;
	state->desc++;
	state->ndesc++;
}
837

838 839 840 841 842 843
static int srp_map_finish_fmr(struct srp_map_state *state,
			      struct srp_target_port *target)
{
	struct srp_device *dev = target->srp_host->srp_dev;
	struct ib_pool_fmr *fmr;
	u64 io_addr = 0;
844

845 846
	if (!state->npages)
		return 0;
847

848 849 850 851 852
	if (state->npages == 1) {
		srp_map_desc(state, state->base_dma_addr, state->fmr_len,
			     target->rkey);
		state->npages = state->fmr_len = 0;
		return 0;
853 854
	}

855 856 857 858
	fmr = ib_fmr_pool_map_phys(dev->fmr_pool, state->pages,
				   state->npages, io_addr);
	if (IS_ERR(fmr))
		return PTR_ERR(fmr);
859

860 861
	*state->next_fmr++ = fmr;
	state->nfmr++;
862

863 864 865 866 867 868 869 870 871 872 873 874 875
	srp_map_desc(state, 0, state->fmr_len, fmr->fmr->rkey);
	state->npages = state->fmr_len = 0;
	return 0;
}

static void srp_map_update_start(struct srp_map_state *state,
				 struct scatterlist *sg, int sg_index,
				 dma_addr_t dma_addr)
{
	state->unmapped_sg = sg;
	state->unmapped_index = sg_index;
	state->unmapped_addr = dma_addr;
}
876

877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898
static int srp_map_sg_entry(struct srp_map_state *state,
			    struct srp_target_port *target,
			    struct scatterlist *sg, int sg_index,
			    int use_fmr)
{
	struct srp_device *dev = target->srp_host->srp_dev;
	struct ib_device *ibdev = dev->dev;
	dma_addr_t dma_addr = ib_sg_dma_address(ibdev, sg);
	unsigned int dma_len = ib_sg_dma_len(ibdev, sg);
	unsigned int len;
	int ret;

	if (!dma_len)
		return 0;

	if (use_fmr == SRP_MAP_NO_FMR) {
		/* Once we're in direct map mode for a request, we don't
		 * go back to FMR mode, so no need to update anything
		 * other than the descriptor.
		 */
		srp_map_desc(state, dma_addr, dma_len, target->rkey);
		return 0;
899
	}
900

901 902 903 904 905 906 907 908 909 910 911 912 913 914
	/* If we start at an offset into the FMR page, don't merge into
	 * the current FMR. Finish it out, and use the kernel's MR for this
	 * sg entry. This is to avoid potential bugs on some SRP targets
	 * that were never quite defined, but went away when the initiator
	 * avoided using FMR on such page fragments.
	 */
	if (dma_addr & ~dev->fmr_page_mask || dma_len > dev->fmr_max_size) {
		ret = srp_map_finish_fmr(state, target);
		if (ret)
			return ret;

		srp_map_desc(state, dma_addr, dma_len, target->rkey);
		srp_map_update_start(state, NULL, 0, 0);
		return 0;
915 916
	}

917 918 919 920 921 922 923
	/* If this is the first sg to go into the FMR, save our position.
	 * We need to know the first unmapped entry, its index, and the
	 * first unmapped address within that entry to be able to restart
	 * mapping after an error.
	 */
	if (!state->unmapped_sg)
		srp_map_update_start(state, sg, sg_index, dma_addr);
924

925 926 927 928 929
	while (dma_len) {
		if (state->npages == SRP_FMR_SIZE) {
			ret = srp_map_finish_fmr(state, target);
			if (ret)
				return ret;
930

931 932 933 934
			srp_map_update_start(state, sg, sg_index, dma_addr);
		}

		len = min_t(unsigned int, dma_len, dev->fmr_page_size);
935

936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953
		if (!state->npages)
			state->base_dma_addr = dma_addr;
		state->pages[state->npages++] = dma_addr;
		state->fmr_len += len;
		dma_addr += len;
		dma_len -= len;
	}

	/* If the last entry of the FMR wasn't a full page, then we need to
	 * close it out and start a new one -- we can only merge at page
	 * boundries.
	 */
	ret = 0;
	if (len != dev->fmr_page_size) {
		ret = srp_map_finish_fmr(state, target);
		if (!ret)
			srp_map_update_start(state, NULL, 0, 0);
	}
954 955 956
	return ret;
}

957 958 959
static int srp_map_data(struct scsi_cmnd *scmnd, struct srp_target_port *target,
			struct srp_request *req)
{
960
	struct scatterlist *scat, *sg;
961
	struct srp_cmd *cmd = req->cmd->buf;
962
	int i, len, nents, count, use_fmr;
963 964
	struct srp_device *dev;
	struct ib_device *ibdev;
965 966 967 968
	struct srp_map_state state;
	struct srp_indirect_buf *indirect_hdr;
	u32 table_len;
	u8 fmt;
969

970
	if (!scsi_sglist(scmnd) || scmnd->sc_data_direction == DMA_NONE)
971 972 973 974
		return sizeof (struct srp_cmd);

	if (scmnd->sc_data_direction != DMA_FROM_DEVICE &&
	    scmnd->sc_data_direction != DMA_TO_DEVICE) {
975 976 977
		shost_printk(KERN_WARNING, target->scsi_host,
			     PFX "Unhandled data direction %d\n",
			     scmnd->sc_data_direction);
978 979 980
		return -EINVAL;
	}

981 982
	nents = scsi_sg_count(scmnd);
	scat  = scsi_sglist(scmnd);
983

984
	dev = target->srp_host->srp_dev;
985 986 987
	ibdev = dev->dev;

	count = ib_dma_map_sg(ibdev, scat, nents, scmnd->sc_data_direction);
988 989
	if (unlikely(count == 0))
		return -EIO;
990 991 992

	fmt = SRP_DATA_DESC_DIRECT;
	len = sizeof (struct srp_cmd) +	sizeof (struct srp_direct_buf);
993

994
	if (count == 1) {
995 996 997 998 999 1000
		/*
		 * The midlayer only generated a single gather/scatter
		 * entry, or DMA mapping coalesced everything to a
		 * single entry.  So a direct descriptor along with
		 * the DMA MR suffices.
		 */
1001
		struct srp_direct_buf *buf = (void *) cmd->add_data;
1002

1003
		buf->va  = cpu_to_be64(ib_sg_dma_address(ibdev, scat));
1004
		buf->key = cpu_to_be32(target->rkey);
1005
		buf->len = cpu_to_be32(ib_sg_dma_len(ibdev, scat));
1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016

		req->nfmr = 0;
		goto map_complete;
	}

	/* We have more than one scatter/gather entry, so build our indirect
	 * descriptor table, trying to merge as many entries with FMR as we
	 * can.
	 */
	indirect_hdr = (void *) cmd->add_data;

1017 1018 1019
	ib_dma_sync_single_for_cpu(ibdev, req->indirect_dma_addr,
				   target->indirect_size, DMA_TO_DEVICE);

1020
	memset(&state, 0, sizeof(state));
1021
	state.desc	= req->indirect_desc;
1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044
	state.pages	= req->map_page;
	state.next_fmr	= req->fmr_list;

	use_fmr = dev->fmr_pool ? SRP_MAP_ALLOW_FMR : SRP_MAP_NO_FMR;

	for_each_sg(scat, sg, count, i) {
		if (srp_map_sg_entry(&state, target, sg, i, use_fmr)) {
			/* FMR mapping failed, so backtrack to the first
			 * unmapped entry and continue on without using FMR.
			 */
			dma_addr_t dma_addr;
			unsigned int dma_len;

backtrack:
			sg = state.unmapped_sg;
			i = state.unmapped_index;

			dma_addr = ib_sg_dma_address(ibdev, sg);
			dma_len = ib_sg_dma_len(ibdev, sg);
			dma_len -= (state.unmapped_addr - dma_addr);
			dma_addr = state.unmapped_addr;
			use_fmr = SRP_MAP_NO_FMR;
			srp_map_desc(&state, dma_addr, dma_len, target->rkey);
1045
		}
1046
	}
1047

1048 1049
	if (use_fmr == SRP_MAP_ALLOW_FMR && srp_map_finish_fmr(&state, target))
		goto backtrack;
1050

1051 1052 1053 1054 1055
	/* We've mapped the request, now pull as much of the indirect
	 * descriptor table as we can into the command buffer. If this
	 * target is not using an external indirect table, we are
	 * guaranteed to fit into the command, as the SCSI layer won't
	 * give us more S/G entries than we allow.
1056 1057 1058 1059 1060 1061 1062
	 */
	req->nfmr = state.nfmr;
	if (state.ndesc == 1) {
		/* FMR mapping was able to collapse this to one entry,
		 * so use a direct descriptor.
		 */
		struct srp_direct_buf *buf = (void *) cmd->add_data;
1063

1064
		*buf = req->indirect_desc[0];
1065
		goto map_complete;
1066 1067
	}

1068 1069 1070 1071 1072 1073 1074 1075
	if (unlikely(target->cmd_sg_cnt < state.ndesc &&
						!target->allow_ext_sg)) {
		shost_printk(KERN_ERR, target->scsi_host,
			     "Could not fit S/G list into SRP_CMD\n");
		return -EIO;
	}

	count = min(state.ndesc, target->cmd_sg_cnt);
1076 1077 1078 1079
	table_len = state.ndesc * sizeof (struct srp_direct_buf);

	fmt = SRP_DATA_DESC_INDIRECT;
	len = sizeof(struct srp_cmd) + sizeof (struct srp_indirect_buf);
1080
	len += count * sizeof (struct srp_direct_buf);
1081

1082 1083
	memcpy(indirect_hdr->desc_list, req->indirect_desc,
	       count * sizeof (struct srp_direct_buf));
1084

1085
	indirect_hdr->table_desc.va = cpu_to_be64(req->indirect_dma_addr);
1086 1087 1088 1089 1090
	indirect_hdr->table_desc.key = cpu_to_be32(target->rkey);
	indirect_hdr->table_desc.len = cpu_to_be32(table_len);
	indirect_hdr->len = cpu_to_be32(state.total_len);

	if (scmnd->sc_data_direction == DMA_TO_DEVICE)
1091
		cmd->data_out_desc_cnt = count;
1092
	else
1093 1094 1095 1096
		cmd->data_in_desc_cnt = count;

	ib_dma_sync_single_for_device(ibdev, req->indirect_dma_addr, table_len,
				      DMA_TO_DEVICE);
1097 1098

map_complete:
1099 1100 1101 1102 1103 1104 1105 1106
	if (scmnd->sc_data_direction == DMA_TO_DEVICE)
		cmd->buf_fmt = fmt << 4;
	else
		cmd->buf_fmt = fmt;

	return len;
}

1107 1108 1109 1110 1111 1112 1113 1114
/*
 * Return an IU and possible credit to the free pool
 */
static void srp_put_tx_iu(struct srp_target_port *target, struct srp_iu *iu,
			  enum srp_iu_type iu_type)
{
	unsigned long flags;

1115
	spin_lock_irqsave(&target->lock, flags);
1116 1117 1118
	list_add(&iu->list, &target->free_tx);
	if (iu_type != SRP_IU_RSP)
		++target->req_lim;
1119
	spin_unlock_irqrestore(&target->lock, flags);
1120 1121
}

1122
/*
1123 1124
 * Must be called with target->lock held to protect req_lim and free_tx.
 * If IU is not sent, it must be returned using srp_put_tx_iu().
1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142
 *
 * Note:
 * An upper limit for the number of allocated information units for each
 * request type is:
 * - SRP_IU_CMD: SRP_CMD_SQ_SIZE, since the SCSI mid-layer never queues
 *   more than Scsi_Host.can_queue requests.
 * - SRP_IU_TSK_MGMT: SRP_TSK_MGMT_SQ_SIZE.
 * - SRP_IU_RSP: 1, since a conforming SRP target never sends more than
 *   one unanswered SRP request to an initiator.
 */
static struct srp_iu *__srp_get_tx_iu(struct srp_target_port *target,
				      enum srp_iu_type iu_type)
{
	s32 rsv = (iu_type == SRP_IU_TSK_MGMT) ? 0 : SRP_TSK_MGMT_SQ_SIZE;
	struct srp_iu *iu;

	srp_send_completion(target->send_cq, target);

1143
	if (list_empty(&target->free_tx))
1144 1145 1146
		return NULL;

	/* Initiator responses to target requests do not consume credits */
1147 1148 1149 1150 1151 1152 1153
	if (iu_type != SRP_IU_RSP) {
		if (target->req_lim <= rsv) {
			++target->zero_req_lim;
			return NULL;
		}

		--target->req_lim;
1154 1155
	}

1156
	iu = list_first_entry(&target->free_tx, struct srp_iu, list);
1157
	list_del(&iu->list);
1158 1159 1160
	return iu;
}

1161 1162
static int srp_post_send(struct srp_target_port *target,
			 struct srp_iu *iu, int len)
1163 1164 1165 1166 1167 1168
{
	struct ib_sge list;
	struct ib_send_wr wr, *bad_wr;

	list.addr   = iu->dma;
	list.length = len;
1169
	list.lkey   = target->lkey;
1170 1171

	wr.next       = NULL;
1172
	wr.wr_id      = (uintptr_t) iu;
1173 1174 1175 1176 1177
	wr.sg_list    = &list;
	wr.num_sge    = 1;
	wr.opcode     = IB_WR_SEND;
	wr.send_flags = IB_SEND_SIGNALED;

1178
	return ib_post_send(target->qp, &wr, &bad_wr);
1179 1180
}

1181
static int srp_post_recv(struct srp_target_port *target, struct srp_iu *iu)
1182 1183
{
	struct ib_recv_wr wr, *bad_wr;
1184
	struct ib_sge list;
1185 1186 1187

	list.addr   = iu->dma;
	list.length = iu->size;
1188
	list.lkey   = target->lkey;
1189 1190

	wr.next     = NULL;
1191
	wr.wr_id    = (uintptr_t) iu;
1192 1193 1194
	wr.sg_list  = &list;
	wr.num_sge  = 1;

1195
	return ib_post_recv(target->qp, &wr, &bad_wr);
1196 1197
}

1198 1199 1200 1201 1202 1203 1204
static void srp_process_rsp(struct srp_target_port *target, struct srp_rsp *rsp)
{
	struct srp_request *req;
	struct scsi_cmnd *scmnd;
	unsigned long flags;

	if (unlikely(rsp->tag & SRP_TAG_TSK_MGMT)) {
1205
		spin_lock_irqsave(&target->lock, flags);
1206
		target->req_lim += be32_to_cpu(rsp->req_lim_delta);
1207
		spin_unlock_irqrestore(&target->lock, flags);
1208

1209 1210 1211 1212
		target->tsk_mgmt_status = -1;
		if (be32_to_cpu(rsp->resp_data_len) >= 4)
			target->tsk_mgmt_status = rsp->data[3];
		complete(&target->tsk_mgmt_done);
1213
	} else {
1214
		req = &target->req_ring[rsp->tag];
B
Bart Van Assche 已提交
1215 1216
		scmnd = srp_claim_req(target, req, NULL);
		if (!scmnd) {
1217 1218 1219
			shost_printk(KERN_ERR, target->scsi_host,
				     "Null scmnd for RSP w/tag %016llx\n",
				     (unsigned long long) rsp->tag);
B
Bart Van Assche 已提交
1220 1221 1222 1223 1224 1225 1226

			spin_lock_irqsave(&target->lock, flags);
			target->req_lim += be32_to_cpu(rsp->req_lim_delta);
			spin_unlock_irqrestore(&target->lock, flags);

			return;
		}
1227 1228 1229 1230 1231 1232 1233 1234 1235 1236
		scmnd->result = rsp->status;

		if (rsp->flags & SRP_RSP_FLAG_SNSVALID) {
			memcpy(scmnd->sense_buffer, rsp->data +
			       be32_to_cpu(rsp->resp_data_len),
			       min_t(int, be32_to_cpu(rsp->sense_data_len),
				     SCSI_SENSE_BUFFERSIZE));
		}

		if (rsp->flags & (SRP_RSP_FLAG_DOOVER | SRP_RSP_FLAG_DOUNDER))
1237
			scsi_set_resid(scmnd, be32_to_cpu(rsp->data_out_res_cnt));
1238
		else if (rsp->flags & (SRP_RSP_FLAG_DIOVER | SRP_RSP_FLAG_DIUNDER))
1239
			scsi_set_resid(scmnd, be32_to_cpu(rsp->data_in_res_cnt));
1240

B
Bart Van Assche 已提交
1241 1242 1243
		srp_free_req(target, req, scmnd,
			     be32_to_cpu(rsp->req_lim_delta));

1244 1245
		scmnd->host_scribble = NULL;
		scmnd->scsi_done(scmnd);
1246 1247 1248
	}
}

1249 1250 1251
static int srp_response_common(struct srp_target_port *target, s32 req_delta,
			       void *rsp, int len)
{
1252
	struct ib_device *dev = target->srp_host->srp_dev->dev;
1253 1254
	unsigned long flags;
	struct srp_iu *iu;
1255
	int err;
1256

1257
	spin_lock_irqsave(&target->lock, flags);
1258 1259
	target->req_lim += req_delta;
	iu = __srp_get_tx_iu(target, SRP_IU_RSP);
1260
	spin_unlock_irqrestore(&target->lock, flags);
1261

1262 1263 1264
	if (!iu) {
		shost_printk(KERN_ERR, target->scsi_host, PFX
			     "no IU available to send response\n");
1265
		return 1;
1266 1267 1268 1269 1270 1271
	}

	ib_dma_sync_single_for_cpu(dev, iu->dma, len, DMA_TO_DEVICE);
	memcpy(iu->buf, rsp, len);
	ib_dma_sync_single_for_device(dev, iu->dma, len, DMA_TO_DEVICE);

1272 1273
	err = srp_post_send(target, iu, len);
	if (err) {
1274 1275
		shost_printk(KERN_ERR, target->scsi_host, PFX
			     "unable to post response: %d\n", err);
1276 1277
		srp_put_tx_iu(target, iu, SRP_IU_RSP);
	}
1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312

	return err;
}

static void srp_process_cred_req(struct srp_target_port *target,
				 struct srp_cred_req *req)
{
	struct srp_cred_rsp rsp = {
		.opcode = SRP_CRED_RSP,
		.tag = req->tag,
	};
	s32 delta = be32_to_cpu(req->req_lim_delta);

	if (srp_response_common(target, delta, &rsp, sizeof rsp))
		shost_printk(KERN_ERR, target->scsi_host, PFX
			     "problems processing SRP_CRED_REQ\n");
}

static void srp_process_aer_req(struct srp_target_port *target,
				struct srp_aer_req *req)
{
	struct srp_aer_rsp rsp = {
		.opcode = SRP_AER_RSP,
		.tag = req->tag,
	};
	s32 delta = be32_to_cpu(req->req_lim_delta);

	shost_printk(KERN_ERR, target->scsi_host, PFX
		     "ignoring AER for LUN %llu\n", be64_to_cpu(req->lun));

	if (srp_response_common(target, delta, &rsp, sizeof rsp))
		shost_printk(KERN_ERR, target->scsi_host, PFX
			     "problems processing SRP_AER_REQ\n");
}

1313 1314
static void srp_handle_recv(struct srp_target_port *target, struct ib_wc *wc)
{
1315
	struct ib_device *dev = target->srp_host->srp_dev->dev;
1316
	struct srp_iu *iu = (struct srp_iu *) (uintptr_t) wc->wr_id;
1317
	int res;
1318 1319
	u8 opcode;

1320 1321
	ib_dma_sync_single_for_cpu(dev, iu->dma, target->max_ti_iu_len,
				   DMA_FROM_DEVICE);
1322 1323 1324 1325

	opcode = *(u8 *) iu->buf;

	if (0) {
1326 1327
		shost_printk(KERN_ERR, target->scsi_host,
			     PFX "recv completion, opcode 0x%02x\n", opcode);
B
Bart Van Assche 已提交
1328 1329
		print_hex_dump(KERN_ERR, "", DUMP_PREFIX_OFFSET, 8, 1,
			       iu->buf, wc->byte_len, true);
1330 1331 1332 1333 1334 1335 1336
	}

	switch (opcode) {
	case SRP_RSP:
		srp_process_rsp(target, iu->buf);
		break;

1337 1338 1339 1340 1341 1342 1343 1344
	case SRP_CRED_REQ:
		srp_process_cred_req(target, iu->buf);
		break;

	case SRP_AER_REQ:
		srp_process_aer_req(target, iu->buf);
		break;

1345 1346
	case SRP_T_LOGOUT:
		/* XXX Handle target logout */
1347 1348
		shost_printk(KERN_WARNING, target->scsi_host,
			     PFX "Got target logout request\n");
1349 1350 1351
		break;

	default:
1352 1353
		shost_printk(KERN_WARNING, target->scsi_host,
			     PFX "Unhandled SRP opcode 0x%02x\n", opcode);
1354 1355 1356
		break;
	}

1357 1358
	ib_dma_sync_single_for_device(dev, iu->dma, target->max_ti_iu_len,
				      DMA_FROM_DEVICE);
1359

1360
	res = srp_post_recv(target, iu);
1361 1362 1363
	if (res != 0)
		shost_printk(KERN_ERR, target->scsi_host,
			     PFX "Recv failed with error code %d\n", res);
1364 1365
}

1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380
/**
 * srp_tl_err_work() - handle a transport layer error
 *
 * Note: This function may get invoked before the rport has been created,
 * hence the target->rport test.
 */
static void srp_tl_err_work(struct work_struct *work)
{
	struct srp_target_port *target;

	target = container_of(work, struct srp_target_port, tl_err_work);
	if (target->rport)
		srp_start_tl_fail_timers(target->rport);
}

1381 1382 1383 1384
static void srp_handle_qp_err(enum ib_wc_status wc_status,
			      enum ib_wc_opcode wc_opcode,
			      struct srp_target_port *target)
{
1385
	if (target->connected && !target->qp_in_error) {
1386 1387 1388 1389
		shost_printk(KERN_ERR, target->scsi_host,
			     PFX "failed %s status %d\n",
			     wc_opcode & IB_WC_RECV ? "receive" : "send",
			     wc_status);
1390
		queue_work(system_long_wq, &target->tl_err_work);
1391
	}
1392 1393 1394
	target->qp_in_error = true;
}

1395
static void srp_recv_completion(struct ib_cq *cq, void *target_ptr)
1396 1397 1398 1399 1400 1401
{
	struct srp_target_port *target = target_ptr;
	struct ib_wc wc;

	ib_req_notify_cq(cq, IB_CQ_NEXT_COMP);
	while (ib_poll_cq(cq, 1, &wc) > 0) {
1402 1403 1404 1405
		if (likely(wc.status == IB_WC_SUCCESS)) {
			srp_handle_recv(target, &wc);
		} else {
			srp_handle_qp_err(wc.status, wc.opcode, target);
1406
		}
1407 1408 1409 1410 1411 1412 1413
	}
}

static void srp_send_completion(struct ib_cq *cq, void *target_ptr)
{
	struct srp_target_port *target = target_ptr;
	struct ib_wc wc;
1414
	struct srp_iu *iu;
1415 1416

	while (ib_poll_cq(cq, 1, &wc) > 0) {
1417 1418 1419 1420 1421
		if (likely(wc.status == IB_WC_SUCCESS)) {
			iu = (struct srp_iu *) (uintptr_t) wc.wr_id;
			list_add(&iu->list, &target->free_tx);
		} else {
			srp_handle_qp_err(wc.status, wc.opcode, target);
1422
		}
1423 1424 1425
	}
}

1426
static int srp_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *scmnd)
1427
{
1428
	struct srp_target_port *target = host_to_target(shost);
1429 1430 1431
	struct srp_request *req;
	struct srp_iu *iu;
	struct srp_cmd *cmd;
1432
	struct ib_device *dev;
1433
	unsigned long flags;
1434
	int len, result;
1435

1436 1437 1438
	result = srp_chkready(target->rport);
	if (unlikely(result)) {
		scmnd->result = result;
1439 1440 1441 1442
		scmnd->scsi_done(scmnd);
		return 0;
	}

1443
	spin_lock_irqsave(&target->lock, flags);
1444
	iu = __srp_get_tx_iu(target, SRP_IU_CMD);
1445
	if (!iu)
1446 1447 1448 1449 1450
		goto err_unlock;

	req = list_first_entry(&target->free_reqs, struct srp_request, list);
	list_del(&req->list);
	spin_unlock_irqrestore(&target->lock, flags);
1451

1452
	dev = target->srp_host->srp_dev->dev;
1453
	ib_dma_sync_single_for_cpu(dev, iu->dma, target->max_iu_len,
1454
				   DMA_TO_DEVICE);
1455 1456

	scmnd->result        = 0;
1457
	scmnd->host_scribble = (void *) req;
1458 1459 1460 1461 1462 1463

	cmd = iu->buf;
	memset(cmd, 0, sizeof *cmd);

	cmd->opcode = SRP_CMD;
	cmd->lun    = cpu_to_be64((u64) scmnd->device->lun << 48);
1464
	cmd->tag    = req->index;
1465 1466 1467 1468 1469 1470 1471
	memcpy(cmd->cdb, scmnd->cmnd, scmnd->cmd_len);

	req->scmnd    = scmnd;
	req->cmd      = iu;

	len = srp_map_data(scmnd, target, req);
	if (len < 0) {
1472 1473
		shost_printk(KERN_ERR, target->scsi_host,
			     PFX "Failed to map data\n");
1474
		goto err_iu;
1475 1476
	}

1477
	ib_dma_sync_single_for_device(dev, iu->dma, target->max_iu_len,
1478
				      DMA_TO_DEVICE);
1479

1480
	if (srp_post_send(target, iu, len)) {
1481
		shost_printk(KERN_ERR, target->scsi_host, PFX "Send failed\n");
1482 1483 1484 1485 1486 1487 1488 1489
		goto err_unmap;
	}

	return 0;

err_unmap:
	srp_unmap_data(scmnd, target, req);

1490 1491 1492
err_iu:
	srp_put_tx_iu(target, iu, SRP_IU_CMD);

1493
	spin_lock_irqsave(&target->lock, flags);
1494
	list_add(&req->list, &target->free_reqs);
1495 1496

err_unlock:
1497
	spin_unlock_irqrestore(&target->lock, flags);
1498

1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513
	return SCSI_MLQUEUE_HOST_BUSY;
}

static int srp_alloc_iu_bufs(struct srp_target_port *target)
{
	int i;

	for (i = 0; i < SRP_RQ_SIZE; ++i) {
		target->rx_ring[i] = srp_alloc_iu(target->srp_host,
						  target->max_ti_iu_len,
						  GFP_KERNEL, DMA_FROM_DEVICE);
		if (!target->rx_ring[i])
			goto err;
	}

1514
	for (i = 0; i < SRP_SQ_SIZE; ++i) {
1515
		target->tx_ring[i] = srp_alloc_iu(target->srp_host,
1516
						  target->max_iu_len,
1517 1518 1519
						  GFP_KERNEL, DMA_TO_DEVICE);
		if (!target->tx_ring[i])
			goto err;
1520 1521

		list_add(&target->tx_ring[i]->list, &target->free_tx);
1522 1523 1524 1525 1526 1527 1528 1529 1530 1531
	}

	return 0;

err:
	for (i = 0; i < SRP_RQ_SIZE; ++i) {
		srp_free_iu(target->srp_host, target->rx_ring[i]);
		target->rx_ring[i] = NULL;
	}

1532
	for (i = 0; i < SRP_SQ_SIZE; ++i) {
1533 1534 1535 1536 1537 1538 1539
		srp_free_iu(target->srp_host, target->tx_ring[i]);
		target->tx_ring[i] = NULL;
	}

	return -ENOMEM;
}

1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566
static uint32_t srp_compute_rq_tmo(struct ib_qp_attr *qp_attr, int attr_mask)
{
	uint64_t T_tr_ns, max_compl_time_ms;
	uint32_t rq_tmo_jiffies;

	/*
	 * According to section 11.2.4.2 in the IBTA spec (Modify Queue Pair,
	 * table 91), both the QP timeout and the retry count have to be set
	 * for RC QP's during the RTR to RTS transition.
	 */
	WARN_ON_ONCE((attr_mask & (IB_QP_TIMEOUT | IB_QP_RETRY_CNT)) !=
		     (IB_QP_TIMEOUT | IB_QP_RETRY_CNT));

	/*
	 * Set target->rq_tmo_jiffies to one second more than the largest time
	 * it can take before an error completion is generated. See also
	 * C9-140..142 in the IBTA spec for more information about how to
	 * convert the QP Local ACK Timeout value to nanoseconds.
	 */
	T_tr_ns = 4096 * (1ULL << qp_attr->timeout);
	max_compl_time_ms = qp_attr->retry_cnt * 4 * T_tr_ns;
	do_div(max_compl_time_ms, NSEC_PER_MSEC);
	rq_tmo_jiffies = msecs_to_jiffies(max_compl_time_ms + 1000);

	return rq_tmo_jiffies;
}

1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625
static void srp_cm_rep_handler(struct ib_cm_id *cm_id,
			       struct srp_login_rsp *lrsp,
			       struct srp_target_port *target)
{
	struct ib_qp_attr *qp_attr = NULL;
	int attr_mask = 0;
	int ret;
	int i;

	if (lrsp->opcode == SRP_LOGIN_RSP) {
		target->max_ti_iu_len = be32_to_cpu(lrsp->max_ti_iu_len);
		target->req_lim       = be32_to_cpu(lrsp->req_lim_delta);

		/*
		 * Reserve credits for task management so we don't
		 * bounce requests back to the SCSI mid-layer.
		 */
		target->scsi_host->can_queue
			= min(target->req_lim - SRP_TSK_MGMT_SQ_SIZE,
			      target->scsi_host->can_queue);
	} else {
		shost_printk(KERN_WARNING, target->scsi_host,
			     PFX "Unhandled RSP opcode %#x\n", lrsp->opcode);
		ret = -ECONNRESET;
		goto error;
	}

	if (!target->rx_ring[0]) {
		ret = srp_alloc_iu_bufs(target);
		if (ret)
			goto error;
	}

	ret = -ENOMEM;
	qp_attr = kmalloc(sizeof *qp_attr, GFP_KERNEL);
	if (!qp_attr)
		goto error;

	qp_attr->qp_state = IB_QPS_RTR;
	ret = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
	if (ret)
		goto error_free;

	ret = ib_modify_qp(target->qp, qp_attr, attr_mask);
	if (ret)
		goto error_free;

	for (i = 0; i < SRP_RQ_SIZE; i++) {
		struct srp_iu *iu = target->rx_ring[i];
		ret = srp_post_recv(target, iu);
		if (ret)
			goto error_free;
	}

	qp_attr->qp_state = IB_QPS_RTS;
	ret = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
	if (ret)
		goto error_free;

1626 1627
	target->rq_tmo_jiffies = srp_compute_rq_tmo(qp_attr, attr_mask);

1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640
	ret = ib_modify_qp(target->qp, qp_attr, attr_mask);
	if (ret)
		goto error_free;

	ret = ib_send_cm_rtu(cm_id, NULL, 0);

error_free:
	kfree(qp_attr);

error:
	target->status = ret;
}

1641 1642 1643 1644
static void srp_cm_rej_handler(struct ib_cm_id *cm_id,
			       struct ib_cm_event *event,
			       struct srp_target_port *target)
{
1645
	struct Scsi_Host *shost = target->scsi_host;
1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661
	struct ib_class_port_info *cpi;
	int opcode;

	switch (event->param.rej_rcvd.reason) {
	case IB_CM_REJ_PORT_CM_REDIRECT:
		cpi = event->param.rej_rcvd.ari;
		target->path.dlid = cpi->redirect_lid;
		target->path.pkey = cpi->redirect_pkey;
		cm_id->remote_cm_qpn = be32_to_cpu(cpi->redirect_qp) & 0x00ffffff;
		memcpy(target->path.dgid.raw, cpi->redirect_gid, 16);

		target->status = target->path.dlid ?
			SRP_DLID_REDIRECT : SRP_PORT_REDIRECT;
		break;

	case IB_CM_REJ_PORT_REDIRECT:
1662
		if (srp_target_is_topspin(target)) {
1663 1664 1665 1666 1667 1668 1669 1670
			/*
			 * Topspin/Cisco SRP gateways incorrectly send
			 * reject reason code 25 when they mean 24
			 * (port redirect).
			 */
			memcpy(target->path.dgid.raw,
			       event->param.rej_rcvd.ari, 16);

1671 1672 1673 1674
			shost_printk(KERN_DEBUG, shost,
				     PFX "Topspin/Cisco redirect to target port GID %016llx%016llx\n",
				     (unsigned long long) be64_to_cpu(target->path.dgid.global.subnet_prefix),
				     (unsigned long long) be64_to_cpu(target->path.dgid.global.interface_id));
1675 1676 1677

			target->status = SRP_PORT_REDIRECT;
		} else {
1678 1679
			shost_printk(KERN_WARNING, shost,
				     "  REJ reason: IB_CM_REJ_PORT_REDIRECT\n");
1680 1681 1682 1683 1684
			target->status = -ECONNRESET;
		}
		break;

	case IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID:
1685 1686
		shost_printk(KERN_WARNING, shost,
			    "  REJ reason: IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID\n");
1687 1688 1689 1690 1691 1692 1693 1694 1695 1696
		target->status = -ECONNRESET;
		break;

	case IB_CM_REJ_CONSUMER_DEFINED:
		opcode = *(u8 *) event->private_data;
		if (opcode == SRP_LOGIN_REJ) {
			struct srp_login_rej *rej = event->private_data;
			u32 reason = be32_to_cpu(rej->reason);

			if (reason == SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE)
1697 1698
				shost_printk(KERN_WARNING, shost,
					     PFX "SRP_LOGIN_REJ: requested max_it_iu_len too large\n");
1699
			else
1700 1701
				shost_printk(KERN_WARNING, shost,
					    PFX "SRP LOGIN REJECTED, reason 0x%08x\n", reason);
1702
		} else
1703 1704 1705
			shost_printk(KERN_WARNING, shost,
				     "  REJ reason: IB_CM_REJ_CONSUMER_DEFINED,"
				     " opcode 0x%02x\n", opcode);
1706 1707 1708
		target->status = -ECONNRESET;
		break;

D
David Dillow 已提交
1709 1710 1711 1712 1713
	case IB_CM_REJ_STALE_CONN:
		shost_printk(KERN_WARNING, shost, "  REJ reason: stale connection\n");
		target->status = SRP_STALE_CONN;
		break;

1714
	default:
1715 1716
		shost_printk(KERN_WARNING, shost, "  REJ reason 0x%x\n",
			     event->param.rej_rcvd.reason);
1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727
		target->status = -ECONNRESET;
	}
}

static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
{
	struct srp_target_port *target = cm_id->context;
	int comp = 0;

	switch (event->event) {
	case IB_CM_REQ_ERROR:
1728 1729
		shost_printk(KERN_DEBUG, target->scsi_host,
			     PFX "Sending CM REQ failed\n");
1730 1731 1732 1733 1734 1735
		comp = 1;
		target->status = -ECONNRESET;
		break;

	case IB_CM_REP_RECEIVED:
		comp = 1;
1736
		srp_cm_rep_handler(cm_id, event->private_data, target);
1737 1738 1739
		break;

	case IB_CM_REJ_RECEIVED:
1740
		shost_printk(KERN_DEBUG, target->scsi_host, PFX "REJ received\n");
1741 1742 1743 1744 1745
		comp = 1;

		srp_cm_rej_handler(cm_id, event, target);
		break;

1746
	case IB_CM_DREQ_RECEIVED:
1747 1748
		shost_printk(KERN_WARNING, target->scsi_host,
			     PFX "DREQ received - connection closed\n");
1749
		srp_change_conn_state(target, false);
1750
		if (ib_send_cm_drep(cm_id, NULL, 0))
1751 1752
			shost_printk(KERN_ERR, target->scsi_host,
				     PFX "Sending CM DREP failed\n");
1753
		queue_work(system_long_wq, &target->tl_err_work);
1754 1755 1756
		break;

	case IB_CM_TIMEWAIT_EXIT:
1757 1758
		shost_printk(KERN_ERR, target->scsi_host,
			     PFX "connection closed\n");
1759 1760 1761 1762

		target->status = 0;
		break;

1763 1764 1765 1766 1767
	case IB_CM_MRA_RECEIVED:
	case IB_CM_DREQ_ERROR:
	case IB_CM_DREP_RECEIVED:
		break;

1768
	default:
1769 1770
		shost_printk(KERN_WARNING, target->scsi_host,
			     PFX "Unhandled CM event %d\n", event->event);
1771 1772 1773 1774 1775 1776 1777 1778 1779
		break;
	}

	if (comp)
		complete(&target->done);

	return 0;
}

1780
static int srp_send_tsk_mgmt(struct srp_target_port *target,
1781
			     u64 req_tag, unsigned int lun, u8 func)
1782
{
1783
	struct ib_device *dev = target->srp_host->srp_dev->dev;
1784 1785 1786
	struct srp_iu *iu;
	struct srp_tsk_mgmt *tsk_mgmt;

1787 1788 1789
	if (!target->connected || target->qp_in_error)
		return -1;

1790
	init_completion(&target->tsk_mgmt_done);
1791

1792
	spin_lock_irq(&target->lock);
1793
	iu = __srp_get_tx_iu(target, SRP_IU_TSK_MGMT);
1794
	spin_unlock_irq(&target->lock);
1795

1796
	if (!iu)
1797
		return -1;
1798

1799 1800
	ib_dma_sync_single_for_cpu(dev, iu->dma, sizeof *tsk_mgmt,
				   DMA_TO_DEVICE);
1801 1802 1803 1804
	tsk_mgmt = iu->buf;
	memset(tsk_mgmt, 0, sizeof *tsk_mgmt);

	tsk_mgmt->opcode 	= SRP_TSK_MGMT;
1805 1806
	tsk_mgmt->lun		= cpu_to_be64((u64) lun << 48);
	tsk_mgmt->tag		= req_tag | SRP_TAG_TSK_MGMT;
1807
	tsk_mgmt->tsk_mgmt_func = func;
1808
	tsk_mgmt->task_tag	= req_tag;
1809

1810 1811
	ib_dma_sync_single_for_device(dev, iu->dma, sizeof *tsk_mgmt,
				      DMA_TO_DEVICE);
1812 1813 1814 1815
	if (srp_post_send(target, iu, sizeof *tsk_mgmt)) {
		srp_put_tx_iu(target, iu, SRP_IU_TSK_MGMT);
		return -1;
	}
1816

1817
	if (!wait_for_completion_timeout(&target->tsk_mgmt_done,
1818
					 msecs_to_jiffies(SRP_ABORT_TIMEOUT_MS)))
1819
		return -1;
1820

1821 1822 1823
	return 0;
}

1824 1825
static int srp_abort(struct scsi_cmnd *scmnd)
{
1826
	struct srp_target_port *target = host_to_target(scmnd->device->host);
1827
	struct srp_request *req = (struct srp_request *) scmnd->host_scribble;
1828
	int ret;
1829

1830
	shost_printk(KERN_ERR, target->scsi_host, "SRP abort called\n");
1831

1832
	if (!req || !srp_claim_req(target, req, scmnd))
1833
		return FAILED;
1834
	if (srp_send_tsk_mgmt(target, req->index, scmnd->device->lun,
1835
			      SRP_TSK_ABORT_TASK) == 0)
1836
		ret = SUCCESS;
1837
	else if (target->rport->state == SRP_RPORT_LOST)
1838
		ret = FAST_IO_FAIL;
1839 1840
	else
		ret = FAILED;
B
Bart Van Assche 已提交
1841 1842
	srp_free_req(target, req, scmnd, 0);
	scmnd->result = DID_ABORT << 16;
1843
	scmnd->scsi_done(scmnd);
1844

1845
	return ret;
1846 1847 1848 1849
}

static int srp_reset_device(struct scsi_cmnd *scmnd)
{
1850
	struct srp_target_port *target = host_to_target(scmnd->device->host);
1851
	int i;
1852

1853
	shost_printk(KERN_ERR, target->scsi_host, "SRP reset_device called\n");
1854

1855 1856
	if (srp_send_tsk_mgmt(target, SRP_TAG_NO_REQ, scmnd->device->lun,
			      SRP_TSK_LUN_RESET))
1857
		return FAILED;
1858
	if (target->tsk_mgmt_status)
1859 1860
		return FAILED;

1861 1862
	for (i = 0; i < SRP_CMD_SQ_SIZE; ++i) {
		struct srp_request *req = &target->req_ring[i];
1863
		if (req->scmnd && req->scmnd->device == scmnd->device)
1864
			srp_finish_req(target, req, DID_RESET << 16);
1865
	}
1866 1867

	return SUCCESS;
1868 1869 1870 1871 1872 1873
}

static int srp_reset_host(struct scsi_cmnd *scmnd)
{
	struct srp_target_port *target = host_to_target(scmnd->device->host);

1874
	shost_printk(KERN_ERR, target->scsi_host, PFX "SRP reset_host called\n");
1875

1876
	return srp_reconnect_rport(target->rport) == 0 ? SUCCESS : FAILED;
1877 1878
}

1879 1880 1881 1882 1883 1884 1885 1886 1887 1888 1889 1890 1891 1892 1893
static int srp_slave_configure(struct scsi_device *sdev)
{
	struct Scsi_Host *shost = sdev->host;
	struct srp_target_port *target = host_to_target(shost);
	struct request_queue *q = sdev->request_queue;
	unsigned long timeout;

	if (sdev->type == TYPE_DISK) {
		timeout = max_t(unsigned, 30 * HZ, target->rq_tmo_jiffies);
		blk_queue_rq_timeout(q, timeout);
	}

	return 0;
}

1894 1895
static ssize_t show_id_ext(struct device *dev, struct device_attribute *attr,
			   char *buf)
1896
{
1897
	struct srp_target_port *target = host_to_target(class_to_shost(dev));
1898 1899 1900 1901 1902

	return sprintf(buf, "0x%016llx\n",
		       (unsigned long long) be64_to_cpu(target->id_ext));
}

1903 1904
static ssize_t show_ioc_guid(struct device *dev, struct device_attribute *attr,
			     char *buf)
1905
{
1906
	struct srp_target_port *target = host_to_target(class_to_shost(dev));
1907 1908 1909 1910 1911

	return sprintf(buf, "0x%016llx\n",
		       (unsigned long long) be64_to_cpu(target->ioc_guid));
}

1912 1913
static ssize_t show_service_id(struct device *dev,
			       struct device_attribute *attr, char *buf)
1914
{
1915
	struct srp_target_port *target = host_to_target(class_to_shost(dev));
1916 1917 1918 1919 1920

	return sprintf(buf, "0x%016llx\n",
		       (unsigned long long) be64_to_cpu(target->service_id));
}

1921 1922
static ssize_t show_pkey(struct device *dev, struct device_attribute *attr,
			 char *buf)
1923
{
1924
	struct srp_target_port *target = host_to_target(class_to_shost(dev));
1925 1926 1927 1928

	return sprintf(buf, "0x%04x\n", be16_to_cpu(target->path.pkey));
}

1929 1930
static ssize_t show_dgid(struct device *dev, struct device_attribute *attr,
			 char *buf)
1931
{
1932
	struct srp_target_port *target = host_to_target(class_to_shost(dev));
1933

H
Harvey Harrison 已提交
1934
	return sprintf(buf, "%pI6\n", target->path.dgid.raw);
1935 1936
}

1937 1938
static ssize_t show_orig_dgid(struct device *dev,
			      struct device_attribute *attr, char *buf)
1939
{
1940
	struct srp_target_port *target = host_to_target(class_to_shost(dev));
1941

H
Harvey Harrison 已提交
1942
	return sprintf(buf, "%pI6\n", target->orig_dgid);
1943 1944
}

1945 1946 1947 1948 1949 1950 1951 1952
static ssize_t show_req_lim(struct device *dev,
			    struct device_attribute *attr, char *buf)
{
	struct srp_target_port *target = host_to_target(class_to_shost(dev));

	return sprintf(buf, "%d\n", target->req_lim);
}

1953 1954
static ssize_t show_zero_req_lim(struct device *dev,
				 struct device_attribute *attr, char *buf)
1955
{
1956
	struct srp_target_port *target = host_to_target(class_to_shost(dev));
1957 1958 1959 1960

	return sprintf(buf, "%d\n", target->zero_req_lim);
}

1961 1962
static ssize_t show_local_ib_port(struct device *dev,
				  struct device_attribute *attr, char *buf)
1963
{
1964
	struct srp_target_port *target = host_to_target(class_to_shost(dev));
1965 1966 1967 1968

	return sprintf(buf, "%d\n", target->srp_host->port);
}

1969 1970
static ssize_t show_local_ib_device(struct device *dev,
				    struct device_attribute *attr, char *buf)
1971
{
1972
	struct srp_target_port *target = host_to_target(class_to_shost(dev));
1973

1974
	return sprintf(buf, "%s\n", target->srp_host->srp_dev->dev->name);
1975 1976
}

1977 1978 1979 1980 1981 1982 1983 1984
static ssize_t show_comp_vector(struct device *dev,
				struct device_attribute *attr, char *buf)
{
	struct srp_target_port *target = host_to_target(class_to_shost(dev));

	return sprintf(buf, "%d\n", target->comp_vector);
}

1985 1986 1987 1988 1989 1990 1991 1992
static ssize_t show_tl_retry_count(struct device *dev,
				   struct device_attribute *attr, char *buf)
{
	struct srp_target_port *target = host_to_target(class_to_shost(dev));

	return sprintf(buf, "%d\n", target->tl_retry_count);
}

1993 1994 1995 1996 1997 1998 1999 2000
static ssize_t show_cmd_sg_entries(struct device *dev,
				   struct device_attribute *attr, char *buf)
{
	struct srp_target_port *target = host_to_target(class_to_shost(dev));

	return sprintf(buf, "%u\n", target->cmd_sg_cnt);
}

2001 2002 2003 2004 2005 2006 2007 2008
static ssize_t show_allow_ext_sg(struct device *dev,
				 struct device_attribute *attr, char *buf)
{
	struct srp_target_port *target = host_to_target(class_to_shost(dev));

	return sprintf(buf, "%s\n", target->allow_ext_sg ? "true" : "false");
}

2009 2010 2011 2012 2013 2014
static DEVICE_ATTR(id_ext,	    S_IRUGO, show_id_ext,	   NULL);
static DEVICE_ATTR(ioc_guid,	    S_IRUGO, show_ioc_guid,	   NULL);
static DEVICE_ATTR(service_id,	    S_IRUGO, show_service_id,	   NULL);
static DEVICE_ATTR(pkey,	    S_IRUGO, show_pkey,		   NULL);
static DEVICE_ATTR(dgid,	    S_IRUGO, show_dgid,		   NULL);
static DEVICE_ATTR(orig_dgid,	    S_IRUGO, show_orig_dgid,	   NULL);
2015
static DEVICE_ATTR(req_lim,         S_IRUGO, show_req_lim,         NULL);
2016 2017 2018
static DEVICE_ATTR(zero_req_lim,    S_IRUGO, show_zero_req_lim,	   NULL);
static DEVICE_ATTR(local_ib_port,   S_IRUGO, show_local_ib_port,   NULL);
static DEVICE_ATTR(local_ib_device, S_IRUGO, show_local_ib_device, NULL);
2019
static DEVICE_ATTR(comp_vector,     S_IRUGO, show_comp_vector,     NULL);
2020
static DEVICE_ATTR(tl_retry_count,  S_IRUGO, show_tl_retry_count,  NULL);
2021
static DEVICE_ATTR(cmd_sg_entries,  S_IRUGO, show_cmd_sg_entries,  NULL);
2022
static DEVICE_ATTR(allow_ext_sg,    S_IRUGO, show_allow_ext_sg,    NULL);
2023 2024 2025 2026 2027 2028 2029 2030

static struct device_attribute *srp_host_attrs[] = {
	&dev_attr_id_ext,
	&dev_attr_ioc_guid,
	&dev_attr_service_id,
	&dev_attr_pkey,
	&dev_attr_dgid,
	&dev_attr_orig_dgid,
2031
	&dev_attr_req_lim,
2032 2033 2034
	&dev_attr_zero_req_lim,
	&dev_attr_local_ib_port,
	&dev_attr_local_ib_device,
2035
	&dev_attr_comp_vector,
2036
	&dev_attr_tl_retry_count,
2037
	&dev_attr_cmd_sg_entries,
2038
	&dev_attr_allow_ext_sg,
2039 2040 2041
	NULL
};

2042 2043
static struct scsi_host_template srp_template = {
	.module				= THIS_MODULE,
R
Roland Dreier 已提交
2044 2045
	.name				= "InfiniBand SRP initiator",
	.proc_name			= DRV_NAME,
2046
	.slave_configure		= srp_slave_configure,
2047 2048 2049 2050 2051
	.info				= srp_target_info,
	.queuecommand			= srp_queuecommand,
	.eh_abort_handler		= srp_abort,
	.eh_device_reset_handler	= srp_reset_device,
	.eh_host_reset_handler		= srp_reset_host,
B
Bart Van Assche 已提交
2052
	.skip_settle_delay		= true,
2053
	.sg_tablesize			= SRP_DEF_SG_TABLESIZE,
2054
	.can_queue			= SRP_CMD_SQ_SIZE,
2055
	.this_id			= -1,
2056
	.cmd_per_lun			= SRP_CMD_SQ_SIZE,
2057 2058
	.use_clustering			= ENABLE_CLUSTERING,
	.shost_attrs			= srp_host_attrs
2059 2060 2061 2062
};

static int srp_add_target(struct srp_host *host, struct srp_target_port *target)
{
2063 2064 2065
	struct srp_rport_identifiers ids;
	struct srp_rport *rport;

2066 2067 2068
	sprintf(target->target_name, "SRP.T10:%016llX",
		 (unsigned long long) be64_to_cpu(target->id_ext));

2069
	if (scsi_add_host(target->scsi_host, host->srp_dev->dev->dma_device))
2070 2071
		return -ENODEV;

2072 2073
	memcpy(ids.port_id, &target->id_ext, 8);
	memcpy(ids.port_id + 8, &target->ioc_guid, 8);
2074
	ids.roles = SRP_RPORT_ROLE_TARGET;
2075 2076 2077 2078 2079 2080
	rport = srp_rport_add(target->scsi_host, &ids);
	if (IS_ERR(rport)) {
		scsi_remove_host(target->scsi_host);
		return PTR_ERR(rport);
	}

2081
	rport->lld_data = target;
2082
	target->rport = rport;
2083

2084
	spin_lock(&host->target_lock);
2085
	list_add_tail(&target->list, &host->target_list);
2086
	spin_unlock(&host->target_lock);
2087 2088 2089 2090

	target->state = SRP_TARGET_LIVE;

	scsi_scan_target(&target->scsi_host->shost_gendev,
2091
			 0, target->scsi_id, SCAN_WILD_CARD, 0);
2092 2093 2094 2095

	return 0;
}

2096
static void srp_release_dev(struct device *dev)
2097 2098
{
	struct srp_host *host =
2099
		container_of(dev, struct srp_host, dev);
2100 2101 2102 2103 2104 2105

	complete(&host->released);
}

static struct class srp_class = {
	.name    = "infiniband_srp",
2106
	.dev_release = srp_release_dev
2107 2108
};

2109 2110 2111 2112 2113 2114 2115 2116 2117 2118 2119 2120 2121 2122 2123 2124 2125 2126 2127 2128 2129 2130 2131 2132 2133 2134 2135 2136 2137 2138
/**
 * srp_conn_unique() - check whether the connection to a target is unique
 */
static bool srp_conn_unique(struct srp_host *host,
			    struct srp_target_port *target)
{
	struct srp_target_port *t;
	bool ret = false;

	if (target->state == SRP_TARGET_REMOVED)
		goto out;

	ret = true;

	spin_lock(&host->target_lock);
	list_for_each_entry(t, &host->target_list, list) {
		if (t != target &&
		    target->id_ext == t->id_ext &&
		    target->ioc_guid == t->ioc_guid &&
		    target->initiator_ext == t->initiator_ext) {
			ret = false;
			break;
		}
	}
	spin_unlock(&host->target_lock);

out:
	return ret;
}

2139 2140 2141 2142 2143 2144 2145 2146 2147 2148 2149 2150 2151 2152 2153 2154
/*
 * Target ports are added by writing
 *
 *     id_ext=<SRP ID ext>,ioc_guid=<SRP IOC GUID>,dgid=<dest GID>,
 *     pkey=<P_Key>,service_id=<service ID>
 *
 * to the add_target sysfs attribute.
 */
enum {
	SRP_OPT_ERR		= 0,
	SRP_OPT_ID_EXT		= 1 << 0,
	SRP_OPT_IOC_GUID	= 1 << 1,
	SRP_OPT_DGID		= 1 << 2,
	SRP_OPT_PKEY		= 1 << 3,
	SRP_OPT_SERVICE_ID	= 1 << 4,
	SRP_OPT_MAX_SECT	= 1 << 5,
2155
	SRP_OPT_MAX_CMD_PER_LUN	= 1 << 6,
2156
	SRP_OPT_IO_CLASS	= 1 << 7,
2157
	SRP_OPT_INITIATOR_EXT	= 1 << 8,
2158
	SRP_OPT_CMD_SG_ENTRIES	= 1 << 9,
2159 2160
	SRP_OPT_ALLOW_EXT_SG	= 1 << 10,
	SRP_OPT_SG_TABLESIZE	= 1 << 11,
2161
	SRP_OPT_COMP_VECTOR	= 1 << 12,
2162
	SRP_OPT_TL_RETRY_COUNT	= 1 << 13,
2163 2164 2165 2166 2167 2168 2169
	SRP_OPT_ALL		= (SRP_OPT_ID_EXT	|
				   SRP_OPT_IOC_GUID	|
				   SRP_OPT_DGID		|
				   SRP_OPT_PKEY		|
				   SRP_OPT_SERVICE_ID),
};

2170
static const match_table_t srp_opt_tokens = {
2171 2172 2173 2174 2175 2176 2177
	{ SRP_OPT_ID_EXT,		"id_ext=%s" 		},
	{ SRP_OPT_IOC_GUID,		"ioc_guid=%s" 		},
	{ SRP_OPT_DGID,			"dgid=%s" 		},
	{ SRP_OPT_PKEY,			"pkey=%x" 		},
	{ SRP_OPT_SERVICE_ID,		"service_id=%s"		},
	{ SRP_OPT_MAX_SECT,		"max_sect=%d" 		},
	{ SRP_OPT_MAX_CMD_PER_LUN,	"max_cmd_per_lun=%d" 	},
2178
	{ SRP_OPT_IO_CLASS,		"io_class=%x"		},
2179
	{ SRP_OPT_INITIATOR_EXT,	"initiator_ext=%s"	},
2180
	{ SRP_OPT_CMD_SG_ENTRIES,	"cmd_sg_entries=%u"	},
2181 2182
	{ SRP_OPT_ALLOW_EXT_SG,		"allow_ext_sg=%u"	},
	{ SRP_OPT_SG_TABLESIZE,		"sg_tablesize=%u"	},
2183
	{ SRP_OPT_COMP_VECTOR,		"comp_vector=%u"	},
2184
	{ SRP_OPT_TL_RETRY_COUNT,	"tl_retry_count=%u"	},
2185
	{ SRP_OPT_ERR,			NULL 			}
2186 2187 2188 2189 2190 2191 2192 2193 2194 2195 2196 2197 2198 2199 2200 2201 2202 2203 2204 2205 2206 2207 2208 2209 2210 2211 2212 2213
};

static int srp_parse_options(const char *buf, struct srp_target_port *target)
{
	char *options, *sep_opt;
	char *p;
	char dgid[3];
	substring_t args[MAX_OPT_ARGS];
	int opt_mask = 0;
	int token;
	int ret = -EINVAL;
	int i;

	options = kstrdup(buf, GFP_KERNEL);
	if (!options)
		return -ENOMEM;

	sep_opt = options;
	while ((p = strsep(&sep_opt, ",")) != NULL) {
		if (!*p)
			continue;

		token = match_token(p, srp_opt_tokens, args);
		opt_mask |= token;

		switch (token) {
		case SRP_OPT_ID_EXT:
			p = match_strdup(args);
2214 2215 2216 2217
			if (!p) {
				ret = -ENOMEM;
				goto out;
			}
2218 2219 2220 2221 2222 2223
			target->id_ext = cpu_to_be64(simple_strtoull(p, NULL, 16));
			kfree(p);
			break;

		case SRP_OPT_IOC_GUID:
			p = match_strdup(args);
2224 2225 2226 2227
			if (!p) {
				ret = -ENOMEM;
				goto out;
			}
2228 2229 2230 2231 2232 2233
			target->ioc_guid = cpu_to_be64(simple_strtoull(p, NULL, 16));
			kfree(p);
			break;

		case SRP_OPT_DGID:
			p = match_strdup(args);
2234 2235 2236 2237
			if (!p) {
				ret = -ENOMEM;
				goto out;
			}
2238
			if (strlen(p) != 32) {
2239
				pr_warn("bad dest GID parameter '%s'\n", p);
2240
				kfree(p);
2241 2242 2243 2244 2245 2246 2247
				goto out;
			}

			for (i = 0; i < 16; ++i) {
				strlcpy(dgid, p + i * 2, 3);
				target->path.dgid.raw[i] = simple_strtoul(dgid, NULL, 16);
			}
2248
			kfree(p);
2249
			memcpy(target->orig_dgid, target->path.dgid.raw, 16);
2250 2251 2252 2253
			break;

		case SRP_OPT_PKEY:
			if (match_hex(args, &token)) {
2254
				pr_warn("bad P_Key parameter '%s'\n", p);
2255 2256 2257 2258 2259 2260 2261
				goto out;
			}
			target->path.pkey = cpu_to_be16(token);
			break;

		case SRP_OPT_SERVICE_ID:
			p = match_strdup(args);
2262 2263 2264 2265
			if (!p) {
				ret = -ENOMEM;
				goto out;
			}
2266
			target->service_id = cpu_to_be64(simple_strtoull(p, NULL, 16));
2267
			target->path.service_id = target->service_id;
2268 2269 2270 2271 2272
			kfree(p);
			break;

		case SRP_OPT_MAX_SECT:
			if (match_int(args, &token)) {
2273
				pr_warn("bad max sect parameter '%s'\n", p);
2274 2275 2276 2277 2278
				goto out;
			}
			target->scsi_host->max_sectors = token;
			break;

2279 2280
		case SRP_OPT_MAX_CMD_PER_LUN:
			if (match_int(args, &token)) {
2281 2282
				pr_warn("bad max cmd_per_lun parameter '%s'\n",
					p);
2283 2284
				goto out;
			}
2285
			target->scsi_host->cmd_per_lun = min(token, SRP_CMD_SQ_SIZE);
2286 2287
			break;

2288 2289
		case SRP_OPT_IO_CLASS:
			if (match_hex(args, &token)) {
2290
				pr_warn("bad IO class parameter '%s'\n", p);
2291 2292 2293 2294
				goto out;
			}
			if (token != SRP_REV10_IB_IO_CLASS &&
			    token != SRP_REV16A_IB_IO_CLASS) {
2295 2296 2297
				pr_warn("unknown IO class parameter value %x specified (use %x or %x).\n",
					token, SRP_REV10_IB_IO_CLASS,
					SRP_REV16A_IB_IO_CLASS);
2298 2299 2300 2301 2302
				goto out;
			}
			target->io_class = token;
			break;

2303 2304
		case SRP_OPT_INITIATOR_EXT:
			p = match_strdup(args);
2305 2306 2307 2308
			if (!p) {
				ret = -ENOMEM;
				goto out;
			}
2309 2310 2311 2312
			target->initiator_ext = cpu_to_be64(simple_strtoull(p, NULL, 16));
			kfree(p);
			break;

2313 2314
		case SRP_OPT_CMD_SG_ENTRIES:
			if (match_int(args, &token) || token < 1 || token > 255) {
2315 2316
				pr_warn("bad max cmd_sg_entries parameter '%s'\n",
					p);
2317 2318 2319 2320 2321
				goto out;
			}
			target->cmd_sg_cnt = token;
			break;

2322 2323
		case SRP_OPT_ALLOW_EXT_SG:
			if (match_int(args, &token)) {
2324
				pr_warn("bad allow_ext_sg parameter '%s'\n", p);
2325 2326 2327 2328 2329 2330 2331 2332
				goto out;
			}
			target->allow_ext_sg = !!token;
			break;

		case SRP_OPT_SG_TABLESIZE:
			if (match_int(args, &token) || token < 1 ||
					token > SCSI_MAX_SG_CHAIN_SEGMENTS) {
2333 2334
				pr_warn("bad max sg_tablesize parameter '%s'\n",
					p);
2335 2336 2337 2338 2339
				goto out;
			}
			target->sg_tablesize = token;
			break;

2340 2341 2342 2343 2344 2345 2346 2347
		case SRP_OPT_COMP_VECTOR:
			if (match_int(args, &token) || token < 0) {
				pr_warn("bad comp_vector parameter '%s'\n", p);
				goto out;
			}
			target->comp_vector = token;
			break;

2348 2349 2350 2351 2352 2353 2354 2355 2356
		case SRP_OPT_TL_RETRY_COUNT:
			if (match_int(args, &token) || token < 2 || token > 7) {
				pr_warn("bad tl_retry_count parameter '%s' (must be a number between 2 and 7)\n",
					p);
				goto out;
			}
			target->tl_retry_count = token;
			break;

2357
		default:
2358 2359
			pr_warn("unknown parameter or missing value '%s' in target creation request\n",
				p);
2360 2361 2362 2363 2364 2365 2366 2367 2368 2369
			goto out;
		}
	}

	if ((opt_mask & SRP_OPT_ALL) == SRP_OPT_ALL)
		ret = 0;
	else
		for (i = 0; i < ARRAY_SIZE(srp_opt_tokens); ++i)
			if ((srp_opt_tokens[i].token & SRP_OPT_ALL) &&
			    !(srp_opt_tokens[i].token & opt_mask))
2370 2371
				pr_warn("target creation request is missing parameter '%s'\n",
					srp_opt_tokens[i].pattern);
2372 2373 2374 2375 2376 2377

out:
	kfree(options);
	return ret;
}

2378 2379
static ssize_t srp_create_target(struct device *dev,
				 struct device_attribute *attr,
2380 2381 2382
				 const char *buf, size_t count)
{
	struct srp_host *host =
2383
		container_of(dev, struct srp_host, dev);
2384 2385
	struct Scsi_Host *target_host;
	struct srp_target_port *target;
2386 2387
	struct ib_device *ibdev = host->srp_dev->dev;
	dma_addr_t dma_addr;
2388
	int i, ret;
2389 2390 2391 2392 2393 2394

	target_host = scsi_host_alloc(&srp_template,
				      sizeof (struct srp_target_port));
	if (!target_host)
		return -ENOMEM;

2395
	target_host->transportt  = ib_srp_transport_template;
2396 2397
	target_host->max_channel = 0;
	target_host->max_id      = 1;
A
Arne Redlich 已提交
2398 2399
	target_host->max_lun     = SRP_MAX_LUN;
	target_host->max_cmd_len = sizeof ((struct srp_cmd *) (void *) 0L)->cdb;
R
Roland Dreier 已提交
2400

2401 2402
	target = host_to_target(target_host);

2403 2404 2405 2406 2407 2408
	target->io_class	= SRP_REV16A_IB_IO_CLASS;
	target->scsi_host	= target_host;
	target->srp_host	= host;
	target->lkey		= host->srp_dev->mr->lkey;
	target->rkey		= host->srp_dev->mr->rkey;
	target->cmd_sg_cnt	= cmd_sg_entries;
2409 2410
	target->sg_tablesize	= indirect_sg_entries ? : cmd_sg_entries;
	target->allow_ext_sg	= allow_ext_sg;
2411
	target->tl_retry_count	= 7;
2412 2413 2414 2415 2416

	ret = srp_parse_options(buf, target);
	if (ret)
		goto err;

2417 2418 2419 2420 2421 2422 2423 2424 2425 2426
	if (!srp_conn_unique(target->srp_host, target)) {
		shost_printk(KERN_INFO, target->scsi_host,
			     PFX "Already connected to target port with id_ext=%016llx;ioc_guid=%016llx;initiator_ext=%016llx\n",
			     be64_to_cpu(target->id_ext),
			     be64_to_cpu(target->ioc_guid),
			     be64_to_cpu(target->initiator_ext));
		ret = -EEXIST;
		goto err;
	}

2427 2428
	if (!host->srp_dev->fmr_pool && !target->allow_ext_sg &&
				target->cmd_sg_cnt < target->sg_tablesize) {
2429
		pr_warn("No FMR pool and no external indirect descriptors, limiting sg_tablesize to cmd_sg_cnt\n");
2430 2431 2432 2433 2434 2435
		target->sg_tablesize = target->cmd_sg_cnt;
	}

	target_host->sg_tablesize = target->sg_tablesize;
	target->indirect_size = target->sg_tablesize *
				sizeof (struct srp_direct_buf);
2436 2437 2438 2439
	target->max_iu_len = sizeof (struct srp_cmd) +
			     sizeof (struct srp_indirect_buf) +
			     target->cmd_sg_cnt * sizeof (struct srp_direct_buf);

2440
	INIT_WORK(&target->tl_err_work, srp_tl_err_work);
2441
	INIT_WORK(&target->remove_work, srp_remove_work);
2442 2443 2444 2445 2446 2447 2448 2449 2450 2451
	spin_lock_init(&target->lock);
	INIT_LIST_HEAD(&target->free_tx);
	INIT_LIST_HEAD(&target->free_reqs);
	for (i = 0; i < SRP_CMD_SQ_SIZE; ++i) {
		struct srp_request *req = &target->req_ring[i];

		req->fmr_list = kmalloc(target->cmd_sg_cnt * sizeof (void *),
					GFP_KERNEL);
		req->map_page = kmalloc(SRP_FMR_SIZE * sizeof (void *),
					GFP_KERNEL);
2452 2453
		req->indirect_desc = kmalloc(target->indirect_size, GFP_KERNEL);
		if (!req->fmr_list || !req->map_page || !req->indirect_desc)
2454 2455
			goto err_free_mem;

2456 2457 2458 2459 2460 2461 2462
		dma_addr = ib_dma_map_single(ibdev, req->indirect_desc,
					     target->indirect_size,
					     DMA_TO_DEVICE);
		if (ib_dma_mapping_error(ibdev, dma_addr))
			goto err_free_mem;

		req->indirect_dma_addr = dma_addr;
2463 2464 2465 2466
		req->index = i;
		list_add_tail(&req->list, &target->free_reqs);
	}

2467
	ib_query_gid(ibdev, host->port, 0, &target->path.sgid);
2468

2469 2470
	shost_printk(KERN_DEBUG, target->scsi_host, PFX
		     "new target: id_ext %016llx ioc_guid %016llx pkey %04x "
H
Harvey Harrison 已提交
2471
		     "service_id %016llx dgid %pI6\n",
2472 2473 2474 2475
	       (unsigned long long) be64_to_cpu(target->id_ext),
	       (unsigned long long) be64_to_cpu(target->ioc_guid),
	       be16_to_cpu(target->path.pkey),
	       (unsigned long long) be64_to_cpu(target->service_id),
2476
	       target->path.dgid.raw);
2477 2478 2479

	ret = srp_create_target_ib(target);
	if (ret)
2480
		goto err_free_mem;
2481

D
David Dillow 已提交
2482 2483
	ret = srp_new_cm_id(target);
	if (ret)
2484
		goto err_free_ib;
2485 2486 2487

	ret = srp_connect_target(target);
	if (ret) {
2488 2489
		shost_printk(KERN_ERR, target->scsi_host,
			     PFX "Connection failed\n");
2490 2491 2492 2493 2494 2495 2496 2497 2498 2499 2500 2501 2502 2503 2504
		goto err_cm_id;
	}

	ret = srp_add_target(host, target);
	if (ret)
		goto err_disconnect;

	return count;

err_disconnect:
	srp_disconnect_target(target);

err_cm_id:
	ib_destroy_cm_id(target->cm_id);

2505
err_free_ib:
2506 2507
	srp_free_target_ib(target);

2508 2509 2510
err_free_mem:
	srp_free_req_data(target);

2511 2512 2513 2514 2515 2516
err:
	scsi_host_put(target_host);

	return ret;
}

2517
static DEVICE_ATTR(add_target, S_IWUSR, NULL, srp_create_target);
2518

2519 2520
static ssize_t show_ibdev(struct device *dev, struct device_attribute *attr,
			  char *buf)
2521
{
2522
	struct srp_host *host = container_of(dev, struct srp_host, dev);
2523

2524
	return sprintf(buf, "%s\n", host->srp_dev->dev->name);
2525 2526
}

2527
static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
2528

2529 2530
static ssize_t show_port(struct device *dev, struct device_attribute *attr,
			 char *buf)
2531
{
2532
	struct srp_host *host = container_of(dev, struct srp_host, dev);
2533 2534 2535 2536

	return sprintf(buf, "%d\n", host->port);
}

2537
static DEVICE_ATTR(port, S_IRUGO, show_port, NULL);
2538

2539
static struct srp_host *srp_add_port(struct srp_device *device, u8 port)
2540 2541 2542 2543 2544 2545 2546 2547
{
	struct srp_host *host;

	host = kzalloc(sizeof *host, GFP_KERNEL);
	if (!host)
		return NULL;

	INIT_LIST_HEAD(&host->target_list);
2548
	spin_lock_init(&host->target_lock);
2549
	init_completion(&host->released);
2550
	host->srp_dev = device;
2551 2552
	host->port = port;

2553 2554
	host->dev.class = &srp_class;
	host->dev.parent = device->dev->dma_device;
2555
	dev_set_name(&host->dev, "srp-%s-%d", device->dev->name, port);
2556

2557
	if (device_register(&host->dev))
2558
		goto free_host;
2559
	if (device_create_file(&host->dev, &dev_attr_add_target))
2560
		goto err_class;
2561
	if (device_create_file(&host->dev, &dev_attr_ibdev))
2562
		goto err_class;
2563
	if (device_create_file(&host->dev, &dev_attr_port))
2564 2565 2566 2567 2568
		goto err_class;

	return host;

err_class:
2569
	device_unregister(&host->dev);
2570

2571
free_host:
2572 2573 2574 2575 2576 2577 2578
	kfree(host);

	return NULL;
}

static void srp_add_one(struct ib_device *device)
{
2579 2580 2581
	struct srp_device *srp_dev;
	struct ib_device_attr *dev_attr;
	struct ib_fmr_pool_param fmr_param;
2582
	struct srp_host *host;
2583
	int max_pages_per_fmr, fmr_page_shift, s, e, p;
2584

2585 2586
	dev_attr = kmalloc(sizeof *dev_attr, GFP_KERNEL);
	if (!dev_attr)
2587
		return;
2588

2589
	if (ib_query_device(device, dev_attr)) {
2590
		pr_warn("Query device failed for %s\n", device->name);
2591 2592 2593 2594 2595 2596 2597 2598 2599
		goto free_attr;
	}

	srp_dev = kmalloc(sizeof *srp_dev, GFP_KERNEL);
	if (!srp_dev)
		goto free_attr;

	/*
	 * Use the smallest page size supported by the HCA, down to a
2600 2601
	 * minimum of 4096 bytes. We're unlikely to build large sglists
	 * out of smaller entries.
2602
	 */
2603 2604 2605 2606
	fmr_page_shift		= max(12, ffs(dev_attr->page_size_cap) - 1);
	srp_dev->fmr_page_size	= 1 << fmr_page_shift;
	srp_dev->fmr_page_mask	= ~((u64) srp_dev->fmr_page_size - 1);
	srp_dev->fmr_max_size	= srp_dev->fmr_page_size * SRP_FMR_SIZE;
2607 2608 2609 2610 2611 2612 2613 2614 2615 2616 2617 2618 2619 2620 2621

	INIT_LIST_HEAD(&srp_dev->dev_list);

	srp_dev->dev = device;
	srp_dev->pd  = ib_alloc_pd(device);
	if (IS_ERR(srp_dev->pd))
		goto free_dev;

	srp_dev->mr = ib_get_dma_mr(srp_dev->pd,
				    IB_ACCESS_LOCAL_WRITE |
				    IB_ACCESS_REMOTE_READ |
				    IB_ACCESS_REMOTE_WRITE);
	if (IS_ERR(srp_dev->mr))
		goto err_pd;

2622 2623 2624 2625 2626 2627 2628 2629 2630 2631 2632 2633 2634 2635 2636 2637 2638 2639
	for (max_pages_per_fmr = SRP_FMR_SIZE;
			max_pages_per_fmr >= SRP_FMR_MIN_SIZE;
			max_pages_per_fmr /= 2, srp_dev->fmr_max_size /= 2) {
		memset(&fmr_param, 0, sizeof fmr_param);
		fmr_param.pool_size	    = SRP_FMR_POOL_SIZE;
		fmr_param.dirty_watermark   = SRP_FMR_DIRTY_SIZE;
		fmr_param.cache		    = 1;
		fmr_param.max_pages_per_fmr = max_pages_per_fmr;
		fmr_param.page_shift	    = fmr_page_shift;
		fmr_param.access	    = (IB_ACCESS_LOCAL_WRITE |
					       IB_ACCESS_REMOTE_WRITE |
					       IB_ACCESS_REMOTE_READ);

		srp_dev->fmr_pool = ib_create_fmr_pool(srp_dev->pd, &fmr_param);
		if (!IS_ERR(srp_dev->fmr_pool))
			break;
	}

2640 2641
	if (IS_ERR(srp_dev->fmr_pool))
		srp_dev->fmr_pool = NULL;
2642

T
Tom Tucker 已提交
2643
	if (device->node_type == RDMA_NODE_IB_SWITCH) {
2644 2645 2646 2647 2648 2649 2650 2651
		s = 0;
		e = 0;
	} else {
		s = 1;
		e = device->phys_port_cnt;
	}

	for (p = s; p <= e; ++p) {
2652
		host = srp_add_port(srp_dev, p);
2653
		if (host)
2654
			list_add_tail(&host->list, &srp_dev->dev_list);
2655 2656
	}

2657 2658 2659 2660 2661 2662 2663 2664 2665 2666 2667 2668
	ib_set_client_data(device, &srp_client, srp_dev);

	goto free_attr;

err_pd:
	ib_dealloc_pd(srp_dev->pd);

free_dev:
	kfree(srp_dev);

free_attr:
	kfree(dev_attr);
2669 2670 2671 2672
}

static void srp_remove_one(struct ib_device *device)
{
2673
	struct srp_device *srp_dev;
2674
	struct srp_host *host, *tmp_host;
2675
	struct srp_target_port *target;
2676

2677
	srp_dev = ib_get_client_data(device, &srp_client);
2678 2679
	if (!srp_dev)
		return;
2680

2681
	list_for_each_entry_safe(host, tmp_host, &srp_dev->dev_list, list) {
2682
		device_unregister(&host->dev);
2683 2684 2685 2686 2687 2688 2689
		/*
		 * Wait for the sysfs entry to go away, so that no new
		 * target ports can be created.
		 */
		wait_for_completion(&host->released);

		/*
2690
		 * Remove all target ports.
2691
		 */
2692
		spin_lock(&host->target_lock);
2693 2694
		list_for_each_entry(target, &host->target_list, list)
			srp_queue_remove_work(target);
2695
		spin_unlock(&host->target_lock);
2696 2697

		/*
2698
		 * Wait for target port removal tasks.
2699
		 */
2700
		flush_workqueue(system_long_wq);
2701 2702 2703 2704

		kfree(host);
	}

2705 2706 2707 2708 2709 2710
	if (srp_dev->fmr_pool)
		ib_destroy_fmr_pool(srp_dev->fmr_pool);
	ib_dereg_mr(srp_dev->mr);
	ib_dealloc_pd(srp_dev->pd);

	kfree(srp_dev);
2711 2712
}

2713
static struct srp_function_template ib_srp_transport_functions = {
2714 2715 2716 2717 2718
	.has_rport_state	 = true,
	.reset_timer_if_blocked	 = true,
	.fast_io_fail_tmo	 = &srp_fast_io_fail_tmo,
	.dev_loss_tmo		 = &srp_dev_loss_tmo,
	.reconnect		 = srp_rport_reconnect,
2719
	.rport_delete		 = srp_rport_delete,
2720
	.terminate_rport_io	 = srp_terminate_io,
2721 2722
};

2723 2724 2725 2726
static int __init srp_init_module(void)
{
	int ret;

2727
	BUILD_BUG_ON(FIELD_SIZEOF(struct ib_wc, wr_id) < sizeof(void *));
2728

2729
	if (srp_sg_tablesize) {
2730
		pr_warn("srp_sg_tablesize is deprecated, please use cmd_sg_entries\n");
2731 2732 2733 2734 2735 2736 2737 2738
		if (!cmd_sg_entries)
			cmd_sg_entries = srp_sg_tablesize;
	}

	if (!cmd_sg_entries)
		cmd_sg_entries = SRP_DEF_SG_TABLESIZE;

	if (cmd_sg_entries > 255) {
2739
		pr_warn("Clamping cmd_sg_entries to 255\n");
2740
		cmd_sg_entries = 255;
2741 2742
	}

2743 2744 2745
	if (!indirect_sg_entries)
		indirect_sg_entries = cmd_sg_entries;
	else if (indirect_sg_entries < cmd_sg_entries) {
2746 2747
		pr_warn("Bumping up indirect_sg_entries to match cmd_sg_entries (%u)\n",
			cmd_sg_entries);
2748 2749 2750
		indirect_sg_entries = cmd_sg_entries;
	}

2751 2752 2753 2754 2755
	ib_srp_transport_template =
		srp_attach_transport(&ib_srp_transport_functions);
	if (!ib_srp_transport_template)
		return -ENOMEM;

2756 2757
	ret = class_register(&srp_class);
	if (ret) {
2758
		pr_err("couldn't register class infiniband_srp\n");
2759
		srp_release_transport(ib_srp_transport_template);
2760 2761 2762
		return ret;
	}

2763 2764
	ib_sa_register_client(&srp_sa_client);

2765 2766
	ret = ib_register_client(&srp_client);
	if (ret) {
2767
		pr_err("couldn't register IB client\n");
2768
		srp_release_transport(ib_srp_transport_template);
2769
		ib_sa_unregister_client(&srp_sa_client);
2770 2771 2772 2773 2774 2775 2776 2777 2778 2779
		class_unregister(&srp_class);
		return ret;
	}

	return 0;
}

static void __exit srp_cleanup_module(void)
{
	ib_unregister_client(&srp_client);
2780
	ib_sa_unregister_client(&srp_sa_client);
2781
	class_unregister(&srp_class);
2782
	srp_release_transport(ib_srp_transport_template);
2783 2784 2785 2786
}

module_init(srp_init_module);
module_exit(srp_cleanup_module);