ib_srp.c 58.1 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.
 */

#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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#include <asm/atomic.h>

#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 ": "
#define DRV_VERSION	"0.2"
#define DRV_RELDATE	"November 1, 2005"

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

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 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)
{
	printk(KERN_ERR PFX "QP event %d\n", event->event);
}

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;
	int ret;

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

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	target->recv_cq = ib_create_cq(target->srp_host->srp_dev->dev,
				       srp_recv_completion, NULL, target, SRP_RQ_SIZE, 0);
	if (IS_ERR(target->recv_cq)) {
		ret = PTR_ERR(target->recv_cq);
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		goto err;
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	}

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	target->send_cq = ib_create_cq(target->srp_host->srp_dev->dev,
				       srp_send_completion, NULL, target, SRP_SQ_SIZE, 0);
	if (IS_ERR(target->send_cq)) {
		ret = PTR_ERR(target->send_cq);
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		goto err_recv_cq;
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	}

	ib_req_notify_cq(target->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             = target->send_cq;
	init_attr->recv_cq             = target->recv_cq;
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	target->qp = ib_create_qp(target->srp_host->srp_dev->pd, init_attr);
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	if (IS_ERR(target->qp)) {
		ret = PTR_ERR(target->qp);
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		goto err_send_cq;
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	}

	ret = srp_init_qp(target, target->qp);
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	if (ret)
		goto err_qp;
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	kfree(init_attr);
	return 0;

err_qp:
	ib_destroy_qp(target->qp);

err_send_cq:
	ib_destroy_cq(target->send_cq);

err_recv_cq:
	ib_destroy_cq(target->recv_cq);

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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	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;
	req->param.retry_count 		      = 7;
	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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	 * 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;
}

static void srp_disconnect_target(struct srp_target_port *target)
{
	/* XXX should send SRP_I_LOGOUT request */

	init_completion(&target->done);
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	if (ib_send_cm_dreq(target->cm_id, NULL, 0)) {
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		shost_printk(KERN_DEBUG, target->scsi_host,
			     PFX "Sending CM DREQ failed\n");
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		return;
	}
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	wait_for_completion(&target->done);
}

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static bool srp_change_state(struct srp_target_port *target,
			    enum srp_target_state old,
			    enum srp_target_state new)
{
	bool changed = false;

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	spin_lock_irq(&target->lock);
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	if (target->state == old) {
		target->state = new;
		changed = true;
	}
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	spin_unlock_irq(&target->lock);
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	return changed;
}

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static void srp_remove_work(struct work_struct *work)
448
{
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	struct srp_target_port *target =
		container_of(work, struct srp_target_port, work);
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	if (!srp_change_state(target, SRP_TARGET_DEAD, SRP_TARGET_REMOVED))
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		return;

455
	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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	srp_remove_host(target->scsi_host);
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	scsi_remove_host(target->scsi_host);
	ib_destroy_cm_id(target->cm_id);
	srp_free_target_ib(target);
	scsi_host_put(target->scsi_host);
}

static int srp_connect_target(struct srp_target_port *target)
{
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	int retries = 3;
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	int ret;

	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:
			return 0;

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

		case SRP_DLID_REDIRECT:
			break;

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		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;

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		default:
			return target->status;
		}
	}
}

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static void srp_unmap_data(struct scsi_cmnd *scmnd,
			   struct srp_target_port *target,
			   struct srp_request *req)
{
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	if (!scsi_sglist(scmnd) ||
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	    (scmnd->sc_data_direction != DMA_TO_DEVICE &&
	     scmnd->sc_data_direction != DMA_FROM_DEVICE))
		return;

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	if (req->fmr) {
		ib_fmr_pool_unmap(req->fmr);
		req->fmr = NULL;
	}

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	ib_dma_unmap_sg(target->srp_host->srp_dev->dev, scsi_sglist(scmnd),
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			scsi_sg_count(scmnd), scmnd->sc_data_direction);
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}

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static void srp_remove_req(struct srp_target_port *target,
			   struct srp_request *req, s32 req_lim_delta)
542
{
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	unsigned long flags;

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	srp_unmap_data(req->scmnd, target, req);
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	spin_lock_irqsave(&target->lock, flags);
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	target->req_lim += req_lim_delta;
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	req->scmnd = NULL;
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	list_add_tail(&req->list, &target->free_reqs);
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	spin_unlock_irqrestore(&target->lock, flags);
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}

static void srp_reset_req(struct srp_target_port *target, struct srp_request *req)
{
	req->scmnd->result = DID_RESET << 16;
	req->scmnd->scsi_done(req->scmnd);
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	srp_remove_req(target, req, 0);
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}

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static int srp_reconnect_target(struct srp_target_port *target)
{
	struct ib_qp_attr qp_attr;
	struct ib_wc wc;
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	int i, ret;
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	if (!srp_change_state(target, SRP_TARGET_LIVE, SRP_TARGET_CONNECTING))
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		return -EAGAIN;

	srp_disconnect_target(target);
	/*
	 * Now get a new local CM ID so that we avoid confusing the
	 * target in case things are really fouled up.
	 */
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	ret = srp_new_cm_id(target);
	if (ret)
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		goto err;

	qp_attr.qp_state = IB_QPS_RESET;
	ret = ib_modify_qp(target->qp, &qp_attr, IB_QP_STATE);
	if (ret)
		goto err;

	ret = srp_init_qp(target, target->qp);
	if (ret)
		goto err;

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	while (ib_poll_cq(target->recv_cq, 1, &wc) > 0)
		; /* nothing */
	while (ib_poll_cq(target->send_cq, 1, &wc) > 0)
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		; /* nothing */

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	for (i = 0; i < SRP_CMD_SQ_SIZE; ++i) {
		struct srp_request *req = &target->req_ring[i];
		if (req->scmnd)
			srp_reset_req(target, req);
	}
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598
	INIT_LIST_HEAD(&target->free_tx);
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	for (i = 0; i < SRP_SQ_SIZE; ++i)
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		list_add(&target->tx_ring[i]->list, &target->free_tx);
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	target->qp_in_error = 0;
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	ret = srp_connect_target(target);
	if (ret)
		goto err;

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	if (!srp_change_state(target, SRP_TARGET_CONNECTING, SRP_TARGET_LIVE))
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		ret = -EAGAIN;

	return ret;

err:
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	shost_printk(KERN_ERR, target->scsi_host,
		     PFX "reconnect failed (%d), removing target port.\n", ret);
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	/*
	 * We couldn't reconnect, so kill our target port off.
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	 * However, we have to defer the real removal because we
	 * are in the context of the SCSI error handler now, which
	 * will deadlock if we call scsi_remove_host().
	 *
	 * Schedule our work inside the lock to avoid a race with
	 * the flush_scheduled_work() in srp_remove_one().
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	 */
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	spin_lock_irq(&target->lock);
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	if (target->state == SRP_TARGET_CONNECTING) {
		target->state = SRP_TARGET_DEAD;
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David Howells 已提交
628
		INIT_WORK(&target->work, srp_remove_work);
T
Tejun Heo 已提交
629
		queue_work(ib_wq, &target->work);
630
	}
631
	spin_unlock_irq(&target->lock);
632 633 634 635

	return ret;
}

636
static int srp_map_fmr(struct srp_target_port *target, struct scatterlist *scat,
637 638 639 640 641 642 643 644 645
		       int sg_cnt, struct srp_request *req,
		       struct srp_direct_buf *buf)
{
	u64 io_addr = 0;
	u64 *dma_pages;
	u32 len;
	int page_cnt;
	int i, j;
	int ret;
646
	struct srp_device *dev = target->srp_host->srp_dev;
647
	struct ib_device *ibdev = dev->dev;
648
	struct scatterlist *sg;
649 650 651 652

	if (!dev->fmr_pool)
		return -ENODEV;

653
	if (ib_sg_dma_address(ibdev, &scat[0]) & ~dev->fmr_page_mask)
654 655
		return -EINVAL;

656
	len = page_cnt = 0;
657 658
	scsi_for_each_sg(req->scmnd, sg, sg_cnt, i) {
		unsigned int dma_len = ib_sg_dma_len(ibdev, sg);
659

660
		if (ib_sg_dma_address(ibdev, sg) & ~dev->fmr_page_mask) {
661 662 663 664 665
			if (i > 0)
				return -EINVAL;
			else
				++page_cnt;
		}
666
		if ((ib_sg_dma_address(ibdev, sg) + dma_len) &
667 668 669 670 671 672 673
		    ~dev->fmr_page_mask) {
			if (i < sg_cnt - 1)
				return -EINVAL;
			else
				++page_cnt;
		}

674
		len += dma_len;
675 676 677 678 679 680 681 682 683 684 685
	}

	page_cnt += len >> dev->fmr_page_shift;
	if (page_cnt > SRP_FMR_SIZE)
		return -ENOMEM;

	dma_pages = kmalloc(sizeof (u64) * page_cnt, GFP_ATOMIC);
	if (!dma_pages)
		return -ENOMEM;

	page_cnt = 0;
686 687
	scsi_for_each_sg(req->scmnd, sg, sg_cnt, i) {
		unsigned int dma_len = ib_sg_dma_len(ibdev, sg);
688 689

		for (j = 0; j < dma_len; j += dev->fmr_page_size)
690
			dma_pages[page_cnt++] =
691
				(ib_sg_dma_address(ibdev, sg) &
692 693
				 dev->fmr_page_mask) + j;
	}
694 695

	req->fmr = ib_fmr_pool_map_phys(dev->fmr_pool,
696
					dma_pages, page_cnt, io_addr);
697 698
	if (IS_ERR(req->fmr)) {
		ret = PTR_ERR(req->fmr);
V
Vu Pham 已提交
699
		req->fmr = NULL;
700 701 702
		goto out;
	}

703 704
	buf->va  = cpu_to_be64(ib_sg_dma_address(ibdev, &scat[0]) &
			       ~dev->fmr_page_mask);
705 706 707 708 709 710 711 712 713 714 715
	buf->key = cpu_to_be32(req->fmr->fmr->rkey);
	buf->len = cpu_to_be32(len);

	ret = 0;

out:
	kfree(dma_pages);

	return ret;
}

716 717 718
static int srp_map_data(struct scsi_cmnd *scmnd, struct srp_target_port *target,
			struct srp_request *req)
{
719
	struct scatterlist *scat;
720
	struct srp_cmd *cmd = req->cmd->buf;
721
	int len, nents, count;
722
	u8 fmt = SRP_DATA_DESC_DIRECT;
723 724
	struct srp_device *dev;
	struct ib_device *ibdev;
725

726
	if (!scsi_sglist(scmnd) || scmnd->sc_data_direction == DMA_NONE)
727 728 729 730
		return sizeof (struct srp_cmd);

	if (scmnd->sc_data_direction != DMA_FROM_DEVICE &&
	    scmnd->sc_data_direction != DMA_TO_DEVICE) {
731 732 733
		shost_printk(KERN_WARNING, target->scsi_host,
			     PFX "Unhandled data direction %d\n",
			     scmnd->sc_data_direction);
734 735 736
		return -EINVAL;
	}

737 738
	nents = scsi_sg_count(scmnd);
	scat  = scsi_sglist(scmnd);
739

740
	dev = target->srp_host->srp_dev;
741 742 743
	ibdev = dev->dev;

	count = ib_dma_map_sg(ibdev, scat, nents, scmnd->sc_data_direction);
744 745 746

	fmt = SRP_DATA_DESC_DIRECT;
	len = sizeof (struct srp_cmd) +	sizeof (struct srp_direct_buf);
747

748
	if (count == 1) {
749 750 751 752 753 754
		/*
		 * 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.
		 */
755
		struct srp_direct_buf *buf = (void *) cmd->add_data;
756

757
		buf->va  = cpu_to_be64(ib_sg_dma_address(ibdev, scat));
758
		buf->key = cpu_to_be32(target->rkey);
759
		buf->len = cpu_to_be32(ib_sg_dma_len(ibdev, scat));
760
	} else if (srp_map_fmr(target, scat, count, req,
761 762 763 764 765 766
			       (void *) cmd->add_data)) {
		/*
		 * FMR mapping failed, and the scatterlist has more
		 * than one entry.  Generate an indirect memory
		 * descriptor.
		 */
767
		struct srp_indirect_buf *buf = (void *) cmd->add_data;
768
		struct scatterlist *sg;
769
		u32 datalen = 0;
770
		int i;
771

772
		fmt = SRP_DATA_DESC_INDIRECT;
773 774 775 776
		len = sizeof (struct srp_cmd) +
			sizeof (struct srp_indirect_buf) +
			count * sizeof (struct srp_direct_buf);

777 778
		scsi_for_each_sg(scmnd, sg, count, i) {
			unsigned int dma_len = ib_sg_dma_len(ibdev, sg);
779

780
			buf->desc_list[i].va  =
781
				cpu_to_be64(ib_sg_dma_address(ibdev, sg));
782
			buf->desc_list[i].key =
783
				cpu_to_be32(target->rkey);
784 785
			buf->desc_list[i].len = cpu_to_be32(dma_len);
			datalen += dma_len;
786
		}
787

788 789 790 791 792
		if (scmnd->sc_data_direction == DMA_TO_DEVICE)
			cmd->data_out_desc_cnt = count;
		else
			cmd->data_in_desc_cnt = count;

793 794
		buf->table_desc.va  =
			cpu_to_be64(req->cmd->dma + sizeof *cmd + sizeof *buf);
795
		buf->table_desc.key =
796
			cpu_to_be32(target->rkey);
797 798 799 800
		buf->table_desc.len =
			cpu_to_be32(count * sizeof (struct srp_direct_buf));

		buf->len = cpu_to_be32(datalen);
801 802 803 804 805 806 807 808 809 810
	}

	if (scmnd->sc_data_direction == DMA_TO_DEVICE)
		cmd->buf_fmt = fmt << 4;
	else
		cmd->buf_fmt = fmt;

	return len;
}

811 812 813 814 815 816 817 818
/*
 * 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;

819
	spin_lock_irqsave(&target->lock, flags);
820 821 822
	list_add(&iu->list, &target->free_tx);
	if (iu_type != SRP_IU_RSP)
		++target->req_lim;
823
	spin_unlock_irqrestore(&target->lock, flags);
824 825
}

826
/*
827 828
 * 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().
829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846
 *
 * 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);

847
	if (list_empty(&target->free_tx))
848 849 850
		return NULL;

	/* Initiator responses to target requests do not consume credits */
851 852 853 854 855 856 857
	if (iu_type != SRP_IU_RSP) {
		if (target->req_lim <= rsv) {
			++target->zero_req_lim;
			return NULL;
		}

		--target->req_lim;
858 859
	}

860
	iu = list_first_entry(&target->free_tx, struct srp_iu, list);
861
	list_del(&iu->list);
862 863 864
	return iu;
}

865 866
static int srp_post_send(struct srp_target_port *target,
			 struct srp_iu *iu, int len)
867 868 869 870 871 872
{
	struct ib_sge list;
	struct ib_send_wr wr, *bad_wr;

	list.addr   = iu->dma;
	list.length = len;
873
	list.lkey   = target->lkey;
874 875

	wr.next       = NULL;
876
	wr.wr_id      = (uintptr_t) iu;
877 878 879 880 881
	wr.sg_list    = &list;
	wr.num_sge    = 1;
	wr.opcode     = IB_WR_SEND;
	wr.send_flags = IB_SEND_SIGNALED;

882
	return ib_post_send(target->qp, &wr, &bad_wr);
883 884
}

885
static int srp_post_recv(struct srp_target_port *target, struct srp_iu *iu)
886 887
{
	struct ib_recv_wr wr, *bad_wr;
888
	struct ib_sge list;
889 890 891

	list.addr   = iu->dma;
	list.length = iu->size;
892
	list.lkey   = target->lkey;
893 894

	wr.next     = NULL;
895
	wr.wr_id    = (uintptr_t) iu;
896 897 898
	wr.sg_list  = &list;
	wr.num_sge  = 1;

899
	return ib_post_recv(target->qp, &wr, &bad_wr);
900 901
}

902 903 904 905 906 907 908
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)) {
909
		spin_lock_irqsave(&target->lock, flags);
910
		target->req_lim += be32_to_cpu(rsp->req_lim_delta);
911
		spin_unlock_irqrestore(&target->lock, flags);
912

913 914 915 916
		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);
917
	} else {
918
		req = &target->req_ring[rsp->tag];
919
		scmnd = req->scmnd;
920
		if (!scmnd)
921 922 923
			shost_printk(KERN_ERR, target->scsi_host,
				     "Null scmnd for RSP w/tag %016llx\n",
				     (unsigned long long) rsp->tag);
924 925 926 927 928 929 930 931 932 933
		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))
934
			scsi_set_resid(scmnd, be32_to_cpu(rsp->data_out_res_cnt));
935
		else if (rsp->flags & (SRP_RSP_FLAG_DIOVER | SRP_RSP_FLAG_DIUNDER))
936
			scsi_set_resid(scmnd, be32_to_cpu(rsp->data_in_res_cnt));
937

938
		srp_remove_req(target, req, be32_to_cpu(rsp->req_lim_delta));
939 940
		scmnd->host_scribble = NULL;
		scmnd->scsi_done(scmnd);
941 942 943
	}
}

944 945 946
static int srp_response_common(struct srp_target_port *target, s32 req_delta,
			       void *rsp, int len)
{
947
	struct ib_device *dev = target->srp_host->srp_dev->dev;
948 949
	unsigned long flags;
	struct srp_iu *iu;
950
	int err;
951

952
	spin_lock_irqsave(&target->lock, flags);
953 954
	target->req_lim += req_delta;
	iu = __srp_get_tx_iu(target, SRP_IU_RSP);
955
	spin_unlock_irqrestore(&target->lock, flags);
956

957 958 959
	if (!iu) {
		shost_printk(KERN_ERR, target->scsi_host, PFX
			     "no IU available to send response\n");
960
		return 1;
961 962 963 964 965 966
	}

	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);

967 968
	err = srp_post_send(target, iu, len);
	if (err) {
969 970
		shost_printk(KERN_ERR, target->scsi_host, PFX
			     "unable to post response: %d\n", err);
971 972
		srp_put_tx_iu(target, iu, SRP_IU_RSP);
	}
973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007

	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");
}

1008 1009
static void srp_handle_recv(struct srp_target_port *target, struct ib_wc *wc)
{
1010 1011
	struct ib_device *dev = target->srp_host->srp_dev->dev;
	struct srp_iu *iu = (struct srp_iu *) wc->wr_id;
1012
	int res;
1013 1014
	u8 opcode;

1015 1016
	ib_dma_sync_single_for_cpu(dev, iu->dma, target->max_ti_iu_len,
				   DMA_FROM_DEVICE);
1017 1018 1019 1020

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

	if (0) {
1021 1022
		shost_printk(KERN_ERR, target->scsi_host,
			     PFX "recv completion, opcode 0x%02x\n", opcode);
B
Bart Van Assche 已提交
1023 1024
		print_hex_dump(KERN_ERR, "", DUMP_PREFIX_OFFSET, 8, 1,
			       iu->buf, wc->byte_len, true);
1025 1026 1027 1028 1029 1030 1031
	}

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

1032 1033 1034 1035 1036 1037 1038 1039
	case SRP_CRED_REQ:
		srp_process_cred_req(target, iu->buf);
		break;

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

1040 1041
	case SRP_T_LOGOUT:
		/* XXX Handle target logout */
1042 1043
		shost_printk(KERN_WARNING, target->scsi_host,
			     PFX "Got target logout request\n");
1044 1045 1046
		break;

	default:
1047 1048
		shost_printk(KERN_WARNING, target->scsi_host,
			     PFX "Unhandled SRP opcode 0x%02x\n", opcode);
1049 1050 1051
		break;
	}

1052 1053
	ib_dma_sync_single_for_device(dev, iu->dma, target->max_ti_iu_len,
				      DMA_FROM_DEVICE);
1054

1055
	res = srp_post_recv(target, iu);
1056 1057 1058
	if (res != 0)
		shost_printk(KERN_ERR, target->scsi_host,
			     PFX "Recv failed with error code %d\n", res);
1059 1060
}

1061
static void srp_recv_completion(struct ib_cq *cq, void *target_ptr)
1062 1063 1064 1065 1066 1067 1068
{
	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) {
		if (wc.status) {
1069
			shost_printk(KERN_ERR, target->scsi_host,
1070
				     PFX "failed receive status %d\n",
1071
				     wc.status);
1072
			target->qp_in_error = 1;
1073 1074 1075
			break;
		}

1076 1077 1078 1079 1080 1081 1082 1083
		srp_handle_recv(target, &wc);
	}
}

static void srp_send_completion(struct ib_cq *cq, void *target_ptr)
{
	struct srp_target_port *target = target_ptr;
	struct ib_wc wc;
1084
	struct srp_iu *iu;
1085 1086 1087 1088 1089 1090 1091 1092 1093 1094

	while (ib_poll_cq(cq, 1, &wc) > 0) {
		if (wc.status) {
			shost_printk(KERN_ERR, target->scsi_host,
				     PFX "failed send status %d\n",
				     wc.status);
			target->qp_in_error = 1;
			break;
		}

1095 1096
		iu = (struct srp_iu *) wc.wr_id;
		list_add(&iu->list, &target->free_tx);
1097 1098 1099
	}
}

1100
static int srp_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *scmnd)
1101
{
1102
	struct srp_target_port *target = host_to_target(shost);
1103 1104 1105
	struct srp_request *req;
	struct srp_iu *iu;
	struct srp_cmd *cmd;
1106
	struct ib_device *dev;
1107
	unsigned long flags;
1108 1109 1110 1111 1112 1113 1114 1115
	int len;

	if (target->state == SRP_TARGET_CONNECTING)
		goto err;

	if (target->state == SRP_TARGET_DEAD ||
	    target->state == SRP_TARGET_REMOVED) {
		scmnd->result = DID_BAD_TARGET << 16;
1116
		scmnd->scsi_done(scmnd);
1117 1118 1119
		return 0;
	}

1120
	spin_lock_irqsave(&target->lock, flags);
1121
	iu = __srp_get_tx_iu(target, SRP_IU_CMD);
1122
	if (!iu)
1123 1124 1125 1126 1127
		goto err_unlock;

	req = list_first_entry(&target->free_reqs, struct srp_request, list);
	list_del(&req->list);
	spin_unlock_irqrestore(&target->lock, flags);
1128

1129
	dev = target->srp_host->srp_dev->dev;
1130
	ib_dma_sync_single_for_cpu(dev, iu->dma, target->max_iu_len,
1131
				   DMA_TO_DEVICE);
1132 1133

	scmnd->result        = 0;
1134
	scmnd->host_scribble = (void *) req;
1135 1136 1137 1138 1139 1140

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

	cmd->opcode = SRP_CMD;
	cmd->lun    = cpu_to_be64((u64) scmnd->device->lun << 48);
1141
	cmd->tag    = req->index;
1142 1143 1144 1145 1146 1147 1148
	memcpy(cmd->cdb, scmnd->cmnd, scmnd->cmd_len);

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

	len = srp_map_data(scmnd, target, req);
	if (len < 0) {
1149 1150
		shost_printk(KERN_ERR, target->scsi_host,
			     PFX "Failed to map data\n");
1151
		goto err_iu;
1152 1153
	}

1154
	ib_dma_sync_single_for_device(dev, iu->dma, target->max_iu_len,
1155
				      DMA_TO_DEVICE);
1156

1157
	if (srp_post_send(target, iu, len)) {
1158
		shost_printk(KERN_ERR, target->scsi_host, PFX "Send failed\n");
1159 1160 1161 1162 1163 1164 1165 1166
		goto err_unmap;
	}

	return 0;

err_unmap:
	srp_unmap_data(scmnd, target, req);

1167 1168 1169
err_iu:
	srp_put_tx_iu(target, iu, SRP_IU_CMD);

1170
	spin_lock_irqsave(&target->lock, flags);
1171
	list_add(&req->list, &target->free_reqs);
1172 1173

err_unlock:
1174
	spin_unlock_irqrestore(&target->lock, flags);
1175

1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191
err:
	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;
	}

1192
	for (i = 0; i < SRP_SQ_SIZE; ++i) {
1193
		target->tx_ring[i] = srp_alloc_iu(target->srp_host,
1194
						  target->max_iu_len,
1195 1196 1197
						  GFP_KERNEL, DMA_TO_DEVICE);
		if (!target->tx_ring[i])
			goto err;
1198 1199

		list_add(&target->tx_ring[i]->list, &target->free_tx);
1200 1201 1202 1203 1204 1205 1206 1207 1208 1209
	}

	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;
	}

1210
	for (i = 0; i < SRP_SQ_SIZE; ++i) {
1211 1212 1213 1214 1215 1216 1217
		srp_free_iu(target->srp_host, target->tx_ring[i]);
		target->tx_ring[i] = NULL;
	}

	return -ENOMEM;
}

1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289
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;

	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;
}

1290 1291 1292 1293
static void srp_cm_rej_handler(struct ib_cm_id *cm_id,
			       struct ib_cm_event *event,
			       struct srp_target_port *target)
{
1294
	struct Scsi_Host *shost = target->scsi_host;
1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310
	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:
1311
		if (srp_target_is_topspin(target)) {
1312 1313 1314 1315 1316 1317 1318 1319
			/*
			 * 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);

1320 1321 1322 1323
			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));
1324 1325 1326

			target->status = SRP_PORT_REDIRECT;
		} else {
1327 1328
			shost_printk(KERN_WARNING, shost,
				     "  REJ reason: IB_CM_REJ_PORT_REDIRECT\n");
1329 1330 1331 1332 1333
			target->status = -ECONNRESET;
		}
		break;

	case IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID:
1334 1335
		shost_printk(KERN_WARNING, shost,
			    "  REJ reason: IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID\n");
1336 1337 1338 1339 1340 1341 1342 1343 1344 1345
		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)
1346 1347
				shost_printk(KERN_WARNING, shost,
					     PFX "SRP_LOGIN_REJ: requested max_it_iu_len too large\n");
1348
			else
1349 1350
				shost_printk(KERN_WARNING, shost,
					    PFX "SRP LOGIN REJECTED, reason 0x%08x\n", reason);
1351
		} else
1352 1353 1354
			shost_printk(KERN_WARNING, shost,
				     "  REJ reason: IB_CM_REJ_CONSUMER_DEFINED,"
				     " opcode 0x%02x\n", opcode);
1355 1356 1357
		target->status = -ECONNRESET;
		break;

D
David Dillow 已提交
1358 1359 1360 1361 1362
	case IB_CM_REJ_STALE_CONN:
		shost_printk(KERN_WARNING, shost, "  REJ reason: stale connection\n");
		target->status = SRP_STALE_CONN;
		break;

1363
	default:
1364 1365
		shost_printk(KERN_WARNING, shost, "  REJ reason 0x%x\n",
			     event->param.rej_rcvd.reason);
1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376
		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:
1377 1378
		shost_printk(KERN_DEBUG, target->scsi_host,
			     PFX "Sending CM REQ failed\n");
1379 1380 1381 1382 1383 1384
		comp = 1;
		target->status = -ECONNRESET;
		break;

	case IB_CM_REP_RECEIVED:
		comp = 1;
1385
		srp_cm_rep_handler(cm_id, event->private_data, target);
1386 1387 1388
		break;

	case IB_CM_REJ_RECEIVED:
1389
		shost_printk(KERN_DEBUG, target->scsi_host, PFX "REJ received\n");
1390 1391 1392 1393 1394
		comp = 1;

		srp_cm_rej_handler(cm_id, event, target);
		break;

1395
	case IB_CM_DREQ_RECEIVED:
1396 1397
		shost_printk(KERN_WARNING, target->scsi_host,
			     PFX "DREQ received - connection closed\n");
1398
		if (ib_send_cm_drep(cm_id, NULL, 0))
1399 1400
			shost_printk(KERN_ERR, target->scsi_host,
				     PFX "Sending CM DREP failed\n");
1401 1402 1403
		break;

	case IB_CM_TIMEWAIT_EXIT:
1404 1405
		shost_printk(KERN_ERR, target->scsi_host,
			     PFX "connection closed\n");
1406 1407 1408 1409 1410

		comp = 1;
		target->status = 0;
		break;

1411 1412 1413 1414 1415
	case IB_CM_MRA_RECEIVED:
	case IB_CM_DREQ_ERROR:
	case IB_CM_DREP_RECEIVED:
		break;

1416
	default:
1417 1418
		shost_printk(KERN_WARNING, target->scsi_host,
			     PFX "Unhandled CM event %d\n", event->event);
1419 1420 1421 1422 1423 1424 1425 1426 1427
		break;
	}

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

	return 0;
}

1428
static int srp_send_tsk_mgmt(struct srp_target_port *target,
1429
			     u64 req_tag, unsigned int lun, u8 func)
1430
{
1431
	struct ib_device *dev = target->srp_host->srp_dev->dev;
1432 1433 1434
	struct srp_iu *iu;
	struct srp_tsk_mgmt *tsk_mgmt;

1435
	if (target->state == SRP_TARGET_DEAD ||
1436
	    target->state == SRP_TARGET_REMOVED)
1437
		return -1;
1438

1439
	init_completion(&target->tsk_mgmt_done);
1440

1441
	spin_lock_irq(&target->lock);
1442
	iu = __srp_get_tx_iu(target, SRP_IU_TSK_MGMT);
1443
	spin_unlock_irq(&target->lock);
1444

1445
	if (!iu)
1446
		return -1;
1447

1448 1449
	ib_dma_sync_single_for_cpu(dev, iu->dma, sizeof *tsk_mgmt,
				   DMA_TO_DEVICE);
1450 1451 1452 1453
	tsk_mgmt = iu->buf;
	memset(tsk_mgmt, 0, sizeof *tsk_mgmt);

	tsk_mgmt->opcode 	= SRP_TSK_MGMT;
1454 1455
	tsk_mgmt->lun		= cpu_to_be64((u64) lun << 48);
	tsk_mgmt->tag		= req_tag | SRP_TAG_TSK_MGMT;
1456
	tsk_mgmt->tsk_mgmt_func = func;
1457
	tsk_mgmt->task_tag	= req_tag;
1458

1459 1460
	ib_dma_sync_single_for_device(dev, iu->dma, sizeof *tsk_mgmt,
				      DMA_TO_DEVICE);
1461 1462 1463 1464
	if (srp_post_send(target, iu, sizeof *tsk_mgmt)) {
		srp_put_tx_iu(target, iu, SRP_IU_TSK_MGMT);
		return -1;
	}
1465

1466
	if (!wait_for_completion_timeout(&target->tsk_mgmt_done,
1467
					 msecs_to_jiffies(SRP_ABORT_TIMEOUT_MS)))
1468
		return -1;
1469

1470 1471 1472
	return 0;
}

1473 1474
static int srp_abort(struct scsi_cmnd *scmnd)
{
1475
	struct srp_target_port *target = host_to_target(scmnd->device->host);
1476
	struct srp_request *req = (struct srp_request *) scmnd->host_scribble;
1477 1478
	int ret = SUCCESS;

1479
	shost_printk(KERN_ERR, target->scsi_host, "SRP abort called\n");
1480

1481
	if (!req || target->qp_in_error)
1482
		return FAILED;
1483 1484
	if (srp_send_tsk_mgmt(target, req->index, scmnd->device->lun,
			      SRP_TSK_ABORT_TASK))
1485 1486
		return FAILED;

1487 1488
	if (req->scmnd) {
		if (!target->tsk_mgmt_status) {
1489
			srp_remove_req(target, req, 0);
1490 1491 1492 1493
			scmnd->result = DID_ABORT << 16;
		} else
			ret = FAILED;
	}
1494 1495

	return ret;
1496 1497 1498 1499
}

static int srp_reset_device(struct scsi_cmnd *scmnd)
{
1500
	struct srp_target_port *target = host_to_target(scmnd->device->host);
1501
	int i;
1502

1503
	shost_printk(KERN_ERR, target->scsi_host, "SRP reset_device called\n");
1504

1505 1506
	if (target->qp_in_error)
		return FAILED;
1507 1508
	if (srp_send_tsk_mgmt(target, SRP_TAG_NO_REQ, scmnd->device->lun,
			      SRP_TSK_LUN_RESET))
1509
		return FAILED;
1510
	if (target->tsk_mgmt_status)
1511 1512
		return FAILED;

1513 1514
	for (i = 0; i < SRP_CMD_SQ_SIZE; ++i) {
		struct srp_request *req = &target->req_ring[i];
1515
		if (req->scmnd && req->scmnd->device == scmnd->device)
1516
			srp_reset_req(target, req);
1517
	}
1518 1519

	return SUCCESS;
1520 1521 1522 1523 1524 1525 1526
}

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

1527
	shost_printk(KERN_ERR, target->scsi_host, PFX "SRP reset_host called\n");
1528 1529 1530 1531 1532 1533 1534

	if (!srp_reconnect_target(target))
		ret = SUCCESS;

	return ret;
}

1535 1536
static ssize_t show_id_ext(struct device *dev, struct device_attribute *attr,
			   char *buf)
1537
{
1538
	struct srp_target_port *target = host_to_target(class_to_shost(dev));
1539 1540 1541 1542 1543 1544 1545 1546 1547

	if (target->state == SRP_TARGET_DEAD ||
	    target->state == SRP_TARGET_REMOVED)
		return -ENODEV;

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

1548 1549
static ssize_t show_ioc_guid(struct device *dev, struct device_attribute *attr,
			     char *buf)
1550
{
1551
	struct srp_target_port *target = host_to_target(class_to_shost(dev));
1552 1553 1554 1555 1556 1557 1558 1559 1560

	if (target->state == SRP_TARGET_DEAD ||
	    target->state == SRP_TARGET_REMOVED)
		return -ENODEV;

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

1561 1562
static ssize_t show_service_id(struct device *dev,
			       struct device_attribute *attr, char *buf)
1563
{
1564
	struct srp_target_port *target = host_to_target(class_to_shost(dev));
1565 1566 1567 1568 1569 1570 1571 1572 1573

	if (target->state == SRP_TARGET_DEAD ||
	    target->state == SRP_TARGET_REMOVED)
		return -ENODEV;

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

1574 1575
static ssize_t show_pkey(struct device *dev, struct device_attribute *attr,
			 char *buf)
1576
{
1577
	struct srp_target_port *target = host_to_target(class_to_shost(dev));
1578 1579 1580 1581 1582 1583 1584 1585

	if (target->state == SRP_TARGET_DEAD ||
	    target->state == SRP_TARGET_REMOVED)
		return -ENODEV;

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

1586 1587
static ssize_t show_dgid(struct device *dev, struct device_attribute *attr,
			 char *buf)
1588
{
1589
	struct srp_target_port *target = host_to_target(class_to_shost(dev));
1590 1591 1592 1593 1594

	if (target->state == SRP_TARGET_DEAD ||
	    target->state == SRP_TARGET_REMOVED)
		return -ENODEV;

H
Harvey Harrison 已提交
1595
	return sprintf(buf, "%pI6\n", target->path.dgid.raw);
1596 1597
}

1598 1599
static ssize_t show_orig_dgid(struct device *dev,
			      struct device_attribute *attr, char *buf)
1600
{
1601
	struct srp_target_port *target = host_to_target(class_to_shost(dev));
1602 1603 1604 1605 1606

	if (target->state == SRP_TARGET_DEAD ||
	    target->state == SRP_TARGET_REMOVED)
		return -ENODEV;

H
Harvey Harrison 已提交
1607
	return sprintf(buf, "%pI6\n", target->orig_dgid);
1608 1609
}

1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621
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));

	if (target->state == SRP_TARGET_DEAD ||
	    target->state == SRP_TARGET_REMOVED)
		return -ENODEV;

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

1622 1623
static ssize_t show_zero_req_lim(struct device *dev,
				 struct device_attribute *attr, char *buf)
1624
{
1625
	struct srp_target_port *target = host_to_target(class_to_shost(dev));
1626 1627 1628 1629 1630 1631 1632 1633

	if (target->state == SRP_TARGET_DEAD ||
	    target->state == SRP_TARGET_REMOVED)
		return -ENODEV;

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

1634 1635
static ssize_t show_local_ib_port(struct device *dev,
				  struct device_attribute *attr, char *buf)
1636
{
1637
	struct srp_target_port *target = host_to_target(class_to_shost(dev));
1638 1639 1640 1641

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

1642 1643
static ssize_t show_local_ib_device(struct device *dev,
				    struct device_attribute *attr, char *buf)
1644
{
1645
	struct srp_target_port *target = host_to_target(class_to_shost(dev));
1646

1647
	return sprintf(buf, "%s\n", target->srp_host->srp_dev->dev->name);
1648 1649
}

1650 1651 1652 1653 1654 1655 1656 1657
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);
}

1658 1659 1660 1661 1662 1663
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);
1664
static DEVICE_ATTR(req_lim,         S_IRUGO, show_req_lim,         NULL);
1665 1666 1667
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);
1668
static DEVICE_ATTR(cmd_sg_entries,  S_IRUGO, show_cmd_sg_entries,  NULL);
1669 1670 1671 1672 1673 1674 1675 1676

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,
1677
	&dev_attr_req_lim,
1678 1679 1680
	&dev_attr_zero_req_lim,
	&dev_attr_local_ib_port,
	&dev_attr_local_ib_device,
1681
	&dev_attr_cmd_sg_entries,
1682 1683 1684
	NULL
};

1685 1686
static struct scsi_host_template srp_template = {
	.module				= THIS_MODULE,
R
Roland Dreier 已提交
1687 1688
	.name				= "InfiniBand SRP initiator",
	.proc_name			= DRV_NAME,
1689 1690 1691 1692 1693
	.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,
1694
	.sg_tablesize			= SRP_DEF_SG_TABLESIZE,
1695
	.can_queue			= SRP_CMD_SQ_SIZE,
1696
	.this_id			= -1,
1697
	.cmd_per_lun			= SRP_CMD_SQ_SIZE,
1698 1699
	.use_clustering			= ENABLE_CLUSTERING,
	.shost_attrs			= srp_host_attrs
1700 1701 1702 1703
};

static int srp_add_target(struct srp_host *host, struct srp_target_port *target)
{
1704 1705 1706
	struct srp_rport_identifiers ids;
	struct srp_rport *rport;

1707 1708 1709
	sprintf(target->target_name, "SRP.T10:%016llX",
		 (unsigned long long) be64_to_cpu(target->id_ext));

1710
	if (scsi_add_host(target->scsi_host, host->srp_dev->dev->dma_device))
1711 1712
		return -ENODEV;

1713 1714
	memcpy(ids.port_id, &target->id_ext, 8);
	memcpy(ids.port_id + 8, &target->ioc_guid, 8);
1715
	ids.roles = SRP_RPORT_ROLE_TARGET;
1716 1717 1718 1719 1720 1721
	rport = srp_rport_add(target->scsi_host, &ids);
	if (IS_ERR(rport)) {
		scsi_remove_host(target->scsi_host);
		return PTR_ERR(rport);
	}

1722
	spin_lock(&host->target_lock);
1723
	list_add_tail(&target->list, &host->target_list);
1724
	spin_unlock(&host->target_lock);
1725 1726 1727 1728

	target->state = SRP_TARGET_LIVE;

	scsi_scan_target(&target->scsi_host->shost_gendev,
1729
			 0, target->scsi_id, SCAN_WILD_CARD, 0);
1730 1731 1732 1733

	return 0;
}

1734
static void srp_release_dev(struct device *dev)
1735 1736
{
	struct srp_host *host =
1737
		container_of(dev, struct srp_host, dev);
1738 1739 1740 1741 1742 1743

	complete(&host->released);
}

static struct class srp_class = {
	.name    = "infiniband_srp",
1744
	.dev_release = srp_release_dev
1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762
};

/*
 * 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,
1763
	SRP_OPT_MAX_CMD_PER_LUN	= 1 << 6,
1764
	SRP_OPT_IO_CLASS	= 1 << 7,
1765
	SRP_OPT_INITIATOR_EXT	= 1 << 8,
1766
	SRP_OPT_CMD_SG_ENTRIES	= 1 << 9,
1767 1768 1769 1770 1771 1772 1773
	SRP_OPT_ALL		= (SRP_OPT_ID_EXT	|
				   SRP_OPT_IOC_GUID	|
				   SRP_OPT_DGID		|
				   SRP_OPT_PKEY		|
				   SRP_OPT_SERVICE_ID),
};

1774
static const match_table_t srp_opt_tokens = {
1775 1776 1777 1778 1779 1780 1781
	{ 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" 	},
1782
	{ SRP_OPT_IO_CLASS,		"io_class=%x"		},
1783
	{ SRP_OPT_INITIATOR_EXT,	"initiator_ext=%s"	},
1784
	{ SRP_OPT_CMD_SG_ENTRIES,	"cmd_sg_entries=%u"	},
1785
	{ SRP_OPT_ERR,			NULL 			}
1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813
};

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);
1814 1815 1816 1817
			if (!p) {
				ret = -ENOMEM;
				goto out;
			}
1818 1819 1820 1821 1822 1823
			target->id_ext = cpu_to_be64(simple_strtoull(p, NULL, 16));
			kfree(p);
			break;

		case SRP_OPT_IOC_GUID:
			p = match_strdup(args);
1824 1825 1826 1827
			if (!p) {
				ret = -ENOMEM;
				goto out;
			}
1828 1829 1830 1831 1832 1833
			target->ioc_guid = cpu_to_be64(simple_strtoull(p, NULL, 16));
			kfree(p);
			break;

		case SRP_OPT_DGID:
			p = match_strdup(args);
1834 1835 1836 1837
			if (!p) {
				ret = -ENOMEM;
				goto out;
			}
1838 1839
			if (strlen(p) != 32) {
				printk(KERN_WARNING PFX "bad dest GID parameter '%s'\n", p);
1840
				kfree(p);
1841 1842 1843 1844 1845 1846 1847
				goto out;
			}

			for (i = 0; i < 16; ++i) {
				strlcpy(dgid, p + i * 2, 3);
				target->path.dgid.raw[i] = simple_strtoul(dgid, NULL, 16);
			}
1848
			kfree(p);
1849
			memcpy(target->orig_dgid, target->path.dgid.raw, 16);
1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861
			break;

		case SRP_OPT_PKEY:
			if (match_hex(args, &token)) {
				printk(KERN_WARNING PFX "bad P_Key parameter '%s'\n", p);
				goto out;
			}
			target->path.pkey = cpu_to_be16(token);
			break;

		case SRP_OPT_SERVICE_ID:
			p = match_strdup(args);
1862 1863 1864 1865
			if (!p) {
				ret = -ENOMEM;
				goto out;
			}
1866
			target->service_id = cpu_to_be64(simple_strtoull(p, NULL, 16));
1867
			target->path.service_id = target->service_id;
1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878
			kfree(p);
			break;

		case SRP_OPT_MAX_SECT:
			if (match_int(args, &token)) {
				printk(KERN_WARNING PFX "bad max sect parameter '%s'\n", p);
				goto out;
			}
			target->scsi_host->max_sectors = token;
			break;

1879 1880 1881 1882 1883
		case SRP_OPT_MAX_CMD_PER_LUN:
			if (match_int(args, &token)) {
				printk(KERN_WARNING PFX "bad max cmd_per_lun parameter '%s'\n", p);
				goto out;
			}
1884
			target->scsi_host->cmd_per_lun = min(token, SRP_CMD_SQ_SIZE);
1885 1886
			break;

1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901
		case SRP_OPT_IO_CLASS:
			if (match_hex(args, &token)) {
				printk(KERN_WARNING PFX "bad  IO class parameter '%s' \n", p);
				goto out;
			}
			if (token != SRP_REV10_IB_IO_CLASS &&
			    token != SRP_REV16A_IB_IO_CLASS) {
				printk(KERN_WARNING PFX "unknown IO class parameter value"
				       " %x specified (use %x or %x).\n",
				       token, SRP_REV10_IB_IO_CLASS, SRP_REV16A_IB_IO_CLASS);
				goto out;
			}
			target->io_class = token;
			break;

1902 1903
		case SRP_OPT_INITIATOR_EXT:
			p = match_strdup(args);
1904 1905 1906 1907
			if (!p) {
				ret = -ENOMEM;
				goto out;
			}
1908 1909 1910 1911
			target->initiator_ext = cpu_to_be64(simple_strtoull(p, NULL, 16));
			kfree(p);
			break;

1912 1913 1914 1915 1916 1917 1918 1919
		case SRP_OPT_CMD_SG_ENTRIES:
			if (match_int(args, &token) || token < 1 || token > 255) {
				printk(KERN_WARNING PFX "bad max cmd_sg_entries parameter '%s'\n", p);
				goto out;
			}
			target->cmd_sg_cnt = token;
			break;

1920 1921 1922 1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941
		default:
			printk(KERN_WARNING PFX "unknown parameter or missing value "
			       "'%s' in target creation request\n", p);
			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))
				printk(KERN_WARNING PFX "target creation request is "
				       "missing parameter '%s'\n",
				       srp_opt_tokens[i].pattern);

out:
	kfree(options);
	return ret;
}

1942 1943
static ssize_t srp_create_target(struct device *dev,
				 struct device_attribute *attr,
1944 1945 1946
				 const char *buf, size_t count)
{
	struct srp_host *host =
1947
		container_of(dev, struct srp_host, dev);
1948 1949 1950 1951 1952 1953 1954 1955 1956 1957
	struct Scsi_Host *target_host;
	struct srp_target_port *target;
	int ret;
	int i;

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

1958
	target_host->transportt  = ib_srp_transport_template;
A
Arne Redlich 已提交
1959 1960
	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
1961

1962 1963
	target = host_to_target(target_host);

1964 1965 1966 1967 1968 1969
	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;
1970

1971
	spin_lock_init(&target->lock);
1972
	INIT_LIST_HEAD(&target->free_tx);
1973
	INIT_LIST_HEAD(&target->free_reqs);
1974
	for (i = 0; i < SRP_CMD_SQ_SIZE; ++i) {
1975 1976 1977
		target->req_ring[i].index = i;
		list_add_tail(&target->req_ring[i].list, &target->free_reqs);
	}
1978 1979 1980 1981 1982

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

1983 1984 1985 1986 1987
	target_host->sg_tablesize = target->cmd_sg_cnt;
	target->max_iu_len = sizeof (struct srp_cmd) +
			     sizeof (struct srp_indirect_buf) +
			     target->cmd_sg_cnt * sizeof (struct srp_direct_buf);

1988
	ib_query_gid(host->srp_dev->dev, host->port, 0, &target->path.sgid);
1989

1990 1991
	shost_printk(KERN_DEBUG, target->scsi_host, PFX
		     "new target: id_ext %016llx ioc_guid %016llx pkey %04x "
H
Harvey Harrison 已提交
1992
		     "service_id %016llx dgid %pI6\n",
1993 1994 1995 1996
	       (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),
1997
	       target->path.dgid.raw);
1998 1999 2000 2001 2002

	ret = srp_create_target_ib(target);
	if (ret)
		goto err;

D
David Dillow 已提交
2003 2004
	ret = srp_new_cm_id(target);
	if (ret)
2005 2006
		goto err_free;

2007
	target->qp_in_error = 0;
2008 2009
	ret = srp_connect_target(target);
	if (ret) {
2010 2011
		shost_printk(KERN_ERR, target->scsi_host,
			     PFX "Connection failed\n");
2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035
		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);

err_free:
	srp_free_target_ib(target);

err:
	scsi_host_put(target_host);

	return ret;
}

2036
static DEVICE_ATTR(add_target, S_IWUSR, NULL, srp_create_target);
2037

2038 2039
static ssize_t show_ibdev(struct device *dev, struct device_attribute *attr,
			  char *buf)
2040
{
2041
	struct srp_host *host = container_of(dev, struct srp_host, dev);
2042

2043
	return sprintf(buf, "%s\n", host->srp_dev->dev->name);
2044 2045
}

2046
static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
2047

2048 2049
static ssize_t show_port(struct device *dev, struct device_attribute *attr,
			 char *buf)
2050
{
2051
	struct srp_host *host = container_of(dev, struct srp_host, dev);
2052 2053 2054 2055

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

2056
static DEVICE_ATTR(port, S_IRUGO, show_port, NULL);
2057

2058
static struct srp_host *srp_add_port(struct srp_device *device, u8 port)
2059 2060 2061 2062 2063 2064 2065 2066
{
	struct srp_host *host;

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

	INIT_LIST_HEAD(&host->target_list);
2067
	spin_lock_init(&host->target_lock);
2068
	init_completion(&host->released);
2069
	host->srp_dev = device;
2070 2071
	host->port = port;

2072 2073
	host->dev.class = &srp_class;
	host->dev.parent = device->dev->dma_device;
2074
	dev_set_name(&host->dev, "srp-%s-%d", device->dev->name, port);
2075

2076
	if (device_register(&host->dev))
2077
		goto free_host;
2078
	if (device_create_file(&host->dev, &dev_attr_add_target))
2079
		goto err_class;
2080
	if (device_create_file(&host->dev, &dev_attr_ibdev))
2081
		goto err_class;
2082
	if (device_create_file(&host->dev, &dev_attr_port))
2083 2084 2085 2086 2087
		goto err_class;

	return host;

err_class:
2088
	device_unregister(&host->dev);
2089

2090
free_host:
2091 2092 2093 2094 2095 2096 2097
	kfree(host);

	return NULL;
}

static void srp_add_one(struct ib_device *device)
{
2098 2099 2100
	struct srp_device *srp_dev;
	struct ib_device_attr *dev_attr;
	struct ib_fmr_pool_param fmr_param;
2101 2102 2103
	struct srp_host *host;
	int s, e, p;

2104 2105
	dev_attr = kmalloc(sizeof *dev_attr, GFP_KERNEL);
	if (!dev_attr)
2106
		return;
2107

2108 2109 2110 2111 2112 2113 2114 2115 2116 2117 2118 2119 2120 2121 2122 2123 2124
	if (ib_query_device(device, dev_attr)) {
		printk(KERN_WARNING PFX "Query device failed for %s\n",
		       device->name);
		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
	 * minimum of 512 bytes (which is the smallest sector that a
	 * SCSI command will ever carry).
	 */
	srp_dev->fmr_page_shift = max(9, ffs(dev_attr->page_size_cap) - 1);
	srp_dev->fmr_page_size  = 1 << srp_dev->fmr_page_shift;
2125
	srp_dev->fmr_page_mask  = ~((u64) srp_dev->fmr_page_size - 1);
2126 2127 2128 2129 2130 2131 2132 2133 2134 2135 2136 2137 2138 2139 2140 2141 2142 2143 2144 2145 2146 2147 2148 2149 2150 2151 2152 2153

	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;

	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 = SRP_FMR_SIZE;
	fmr_param.page_shift	    = srp_dev->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))
		srp_dev->fmr_pool = NULL;
2154

T
Tom Tucker 已提交
2155
	if (device->node_type == RDMA_NODE_IB_SWITCH) {
2156 2157 2158 2159 2160 2161 2162 2163
		s = 0;
		e = 0;
	} else {
		s = 1;
		e = device->phys_port_cnt;
	}

	for (p = s; p <= e; ++p) {
2164
		host = srp_add_port(srp_dev, p);
2165
		if (host)
2166
			list_add_tail(&host->list, &srp_dev->dev_list);
2167 2168
	}

2169 2170 2171 2172 2173 2174 2175 2176 2177 2178 2179 2180
	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);
2181 2182 2183 2184
}

static void srp_remove_one(struct ib_device *device)
{
2185
	struct srp_device *srp_dev;
2186 2187 2188 2189
	struct srp_host *host, *tmp_host;
	LIST_HEAD(target_list);
	struct srp_target_port *target, *tmp_target;

2190
	srp_dev = ib_get_client_data(device, &srp_client);
2191

2192
	list_for_each_entry_safe(host, tmp_host, &srp_dev->dev_list, list) {
2193
		device_unregister(&host->dev);
2194 2195 2196 2197 2198 2199 2200 2201 2202 2203
		/*
		 * Wait for the sysfs entry to go away, so that no new
		 * target ports can be created.
		 */
		wait_for_completion(&host->released);

		/*
		 * Mark all target ports as removed, so we stop queueing
		 * commands and don't try to reconnect.
		 */
2204
		spin_lock(&host->target_lock);
2205
		list_for_each_entry(target, &host->target_list, list) {
2206
			spin_lock_irq(&target->lock);
2207
			target->state = SRP_TARGET_REMOVED;
2208
			spin_unlock_irq(&target->lock);
2209
		}
2210
		spin_unlock(&host->target_lock);
2211 2212 2213 2214 2215 2216

		/*
		 * Wait for any reconnection tasks that may have
		 * started before we marked our target ports as
		 * removed, and any target port removal tasks.
		 */
T
Tejun Heo 已提交
2217
		flush_workqueue(ib_wq);
2218 2219 2220

		list_for_each_entry_safe(target, tmp_target,
					 &host->target_list, list) {
2221
			srp_remove_host(target->scsi_host);
2222
			scsi_remove_host(target->scsi_host);
2223 2224 2225 2226 2227 2228 2229 2230 2231
			srp_disconnect_target(target);
			ib_destroy_cm_id(target->cm_id);
			srp_free_target_ib(target);
			scsi_host_put(target->scsi_host);
		}

		kfree(host);
	}

2232 2233 2234 2235 2236 2237
	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);
2238 2239
}

2240 2241 2242
static struct srp_function_template ib_srp_transport_functions = {
};

2243 2244 2245 2246
static int __init srp_init_module(void)
{
	int ret;

2247
	BUILD_BUG_ON(FIELD_SIZEOF(struct ib_wc, wr_id) < sizeof(void *));
2248

2249 2250 2251 2252 2253 2254 2255 2256 2257 2258 2259 2260
	if (srp_sg_tablesize) {
		printk(KERN_WARNING PFX "srp_sg_tablesize is deprecated, please use cmd_sg_entries\n");
		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) {
		printk(KERN_WARNING PFX "Clamping cmd_sg_entries to 255\n");
		cmd_sg_entries = 255;
2261 2262
	}

2263 2264 2265 2266 2267
	ib_srp_transport_template =
		srp_attach_transport(&ib_srp_transport_functions);
	if (!ib_srp_transport_template)
		return -ENOMEM;

2268 2269 2270
	ret = class_register(&srp_class);
	if (ret) {
		printk(KERN_ERR PFX "couldn't register class infiniband_srp\n");
2271
		srp_release_transport(ib_srp_transport_template);
2272 2273 2274
		return ret;
	}

2275 2276
	ib_sa_register_client(&srp_sa_client);

2277 2278 2279
	ret = ib_register_client(&srp_client);
	if (ret) {
		printk(KERN_ERR PFX "couldn't register IB client\n");
2280
		srp_release_transport(ib_srp_transport_template);
2281
		ib_sa_unregister_client(&srp_sa_client);
2282 2283 2284 2285 2286 2287 2288 2289 2290 2291
		class_unregister(&srp_class);
		return ret;
	}

	return 0;
}

static void __exit srp_cleanup_module(void)
{
	ib_unregister_client(&srp_client);
2292
	ib_sa_unregister_client(&srp_sa_client);
2293
	class_unregister(&srp_class);
2294
	srp_release_transport(ib_srp_transport_template);
2295 2296 2297 2298
}

module_init(srp_init_module);
module_exit(srp_cleanup_module);