ib_srp.c 54.7 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 int srp_sg_tablesize = SRP_DEF_SG_TABLESIZE;
static int srp_max_iu_len;

module_param(srp_sg_tablesize, int, 0444);
MODULE_PARM_DESC(srp_sg_tablesize,
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		 "Max number of gather/scatter entries per I/O (default is 12, max 255)");
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static int topspin_workarounds = 1;

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 int mellanox_workarounds = 1;

module_param(mellanox_workarounds, int, 0444);
MODULE_PARM_DESC(mellanox_workarounds,
		 "Enable workarounds for Mellanox SRP target bugs if != 0");

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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 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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}

static int srp_target_is_mellanox(struct srp_target_port *target)
{
	static const u8 mellanox_oui[3] = { 0x00, 0x02, 0xc9 };

	return mellanox_workarounds &&
		!memcmp(&target->ioc_guid, mellanox_oui, sizeof mellanox_oui);
}

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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 out;
	}

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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);
		ib_destroy_cq(target->recv_cq);
		goto out;
	}

	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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		ib_destroy_cq(target->send_cq);
		ib_destroy_cq(target->recv_cq);
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		goto out;
	}

	ret = srp_init_qp(target, target->qp);
	if (ret) {
		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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		goto out;
	}

out:
	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]);
	for (i = 0; i < SRP_SQ_SIZE + 1; ++i)
		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(srp_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.
408
	 */
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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 void srp_remove_work(struct work_struct *work)
440
{
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	struct srp_target_port *target =
		container_of(work, struct srp_target_port, work);
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	spin_lock_irq(target->scsi_host->host_lock);
	if (target->state != SRP_TARGET_DEAD) {
		spin_unlock_irq(target->scsi_host->host_lock);
		return;
	}
	target->state = SRP_TARGET_REMOVED;
	spin_unlock_irq(target->scsi_host->host_lock);

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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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	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)
{
	srp_unmap_data(req->scmnd, target, req);
	list_move_tail(&req->list, &target->free_reqs);
}

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);
	srp_remove_req(target, req);
}

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static int srp_reconnect_target(struct srp_target_port *target)
{
	struct ib_qp_attr qp_attr;
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	struct srp_request *req, *tmp;
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	struct ib_wc wc;
	int ret;

	spin_lock_irq(target->scsi_host->host_lock);
	if (target->state != SRP_TARGET_LIVE) {
		spin_unlock_irq(target->scsi_host->host_lock);
		return -EAGAIN;
	}
	target->state = SRP_TARGET_CONNECTING;
	spin_unlock_irq(target->scsi_host->host_lock);

	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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	spin_lock_irq(target->scsi_host->host_lock);
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	list_for_each_entry_safe(req, tmp, &target->req_queue, list)
		srp_reset_req(target, req);
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	spin_unlock_irq(target->scsi_host->host_lock);
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	target->rx_head	 = 0;
	target->tx_head	 = 0;
	target->tx_tail  = 0;

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	target->qp_in_error = 0;
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	ret = srp_connect_target(target);
	if (ret)
		goto err;

	spin_lock_irq(target->scsi_host->host_lock);
	if (target->state == SRP_TARGET_CONNECTING) {
		ret = 0;
		target->state = SRP_TARGET_LIVE;
	} else
		ret = -EAGAIN;
	spin_unlock_irq(target->scsi_host->host_lock);

	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.
	 * However, we have to defer the real removal because we might
	 * be in the context of the SCSI error handler now, which
	 * would deadlock if we call scsi_remove_host().
	 */
	spin_lock_irq(target->scsi_host->host_lock);
	if (target->state == SRP_TARGET_CONNECTING) {
		target->state = SRP_TARGET_DEAD;
D
David Howells 已提交
625
		INIT_WORK(&target->work, srp_remove_work);
626 627 628 629 630 631 632
		schedule_work(&target->work);
	}
	spin_unlock_irq(target->scsi_host->host_lock);

	return ret;
}

633
static int srp_map_fmr(struct srp_target_port *target, struct scatterlist *scat,
634 635 636 637 638 639 640 641 642
		       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;
643
	struct srp_device *dev = target->srp_host->srp_dev;
644
	struct ib_device *ibdev = dev->dev;
645
	struct scatterlist *sg;
646 647 648 649

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

650 651
	if (srp_target_is_mellanox(target) &&
	    (ib_sg_dma_address(ibdev, &scat[0]) & ~dev->fmr_page_mask))
652 653
		return -EINVAL;

654
	len = page_cnt = 0;
655 656
	scsi_for_each_sg(req->scmnd, sg, sg_cnt, i) {
		unsigned int dma_len = ib_sg_dma_len(ibdev, sg);
657

658
		if (ib_sg_dma_address(ibdev, sg) & ~dev->fmr_page_mask) {
659 660 661 662 663
			if (i > 0)
				return -EINVAL;
			else
				++page_cnt;
		}
664
		if ((ib_sg_dma_address(ibdev, sg) + dma_len) &
665 666 667 668 669 670 671
		    ~dev->fmr_page_mask) {
			if (i < sg_cnt - 1)
				return -EINVAL;
			else
				++page_cnt;
		}

672
		len += dma_len;
673 674 675 676 677 678 679 680 681 682 683
	}

	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;
684 685
	scsi_for_each_sg(req->scmnd, sg, sg_cnt, i) {
		unsigned int dma_len = ib_sg_dma_len(ibdev, sg);
686 687

		for (j = 0; j < dma_len; j += dev->fmr_page_size)
688
			dma_pages[page_cnt++] =
689
				(ib_sg_dma_address(ibdev, sg) &
690 691
				 dev->fmr_page_mask) + j;
	}
692 693

	req->fmr = ib_fmr_pool_map_phys(dev->fmr_pool,
694
					dma_pages, page_cnt, io_addr);
695 696
	if (IS_ERR(req->fmr)) {
		ret = PTR_ERR(req->fmr);
V
Vu Pham 已提交
697
		req->fmr = NULL;
698 699 700
		goto out;
	}

701 702
	buf->va  = cpu_to_be64(ib_sg_dma_address(ibdev, &scat[0]) &
			       ~dev->fmr_page_mask);
703 704 705 706 707 708 709 710 711 712 713
	buf->key = cpu_to_be32(req->fmr->fmr->rkey);
	buf->len = cpu_to_be32(len);

	ret = 0;

out:
	kfree(dma_pages);

	return ret;
}

714 715 716
static int srp_map_data(struct scsi_cmnd *scmnd, struct srp_target_port *target,
			struct srp_request *req)
{
717
	struct scatterlist *scat;
718
	struct srp_cmd *cmd = req->cmd->buf;
719
	int len, nents, count;
720
	u8 fmt = SRP_DATA_DESC_DIRECT;
721 722
	struct srp_device *dev;
	struct ib_device *ibdev;
723

724
	if (!scsi_sglist(scmnd) || scmnd->sc_data_direction == DMA_NONE)
725 726 727 728
		return sizeof (struct srp_cmd);

	if (scmnd->sc_data_direction != DMA_FROM_DEVICE &&
	    scmnd->sc_data_direction != DMA_TO_DEVICE) {
729 730 731
		shost_printk(KERN_WARNING, target->scsi_host,
			     PFX "Unhandled data direction %d\n",
			     scmnd->sc_data_direction);
732 733 734
		return -EINVAL;
	}

735 736
	nents = scsi_sg_count(scmnd);
	scat  = scsi_sglist(scmnd);
737

738
	dev = target->srp_host->srp_dev;
739 740 741
	ibdev = dev->dev;

	count = ib_dma_map_sg(ibdev, scat, nents, scmnd->sc_data_direction);
742 743 744

	fmt = SRP_DATA_DESC_DIRECT;
	len = sizeof (struct srp_cmd) +	sizeof (struct srp_direct_buf);
745

746
	if (count == 1) {
747 748 749 750 751 752
		/*
		 * 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.
		 */
753
		struct srp_direct_buf *buf = (void *) cmd->add_data;
754

755 756 757
		buf->va  = cpu_to_be64(ib_sg_dma_address(ibdev, scat));
		buf->key = cpu_to_be32(dev->mr->rkey);
		buf->len = cpu_to_be32(ib_sg_dma_len(ibdev, scat));
758
	} else if (srp_map_fmr(target, scat, count, req,
759 760 761 762 763 764
			       (void *) cmd->add_data)) {
		/*
		 * FMR mapping failed, and the scatterlist has more
		 * than one entry.  Generate an indirect memory
		 * descriptor.
		 */
765
		struct srp_indirect_buf *buf = (void *) cmd->add_data;
766
		struct scatterlist *sg;
767
		u32 datalen = 0;
768
		int i;
769

770
		fmt = SRP_DATA_DESC_INDIRECT;
771 772 773 774
		len = sizeof (struct srp_cmd) +
			sizeof (struct srp_indirect_buf) +
			count * sizeof (struct srp_direct_buf);

775 776
		scsi_for_each_sg(scmnd, sg, count, i) {
			unsigned int dma_len = ib_sg_dma_len(ibdev, sg);
777

778
			buf->desc_list[i].va  =
779
				cpu_to_be64(ib_sg_dma_address(ibdev, sg));
780
			buf->desc_list[i].key =
781 782 783
				cpu_to_be32(dev->mr->rkey);
			buf->desc_list[i].len = cpu_to_be32(dma_len);
			datalen += dma_len;
784
		}
785

786 787 788 789 790
		if (scmnd->sc_data_direction == DMA_TO_DEVICE)
			cmd->data_out_desc_cnt = count;
		else
			cmd->data_in_desc_cnt = count;

791 792
		buf->table_desc.va  =
			cpu_to_be64(req->cmd->dma + sizeof *cmd + sizeof *buf);
793
		buf->table_desc.key =
794
			cpu_to_be32(target->srp_host->srp_dev->mr->rkey);
795 796 797 798
		buf->table_desc.len =
			cpu_to_be32(count * sizeof (struct srp_direct_buf));

		buf->len = cpu_to_be32(datalen);
799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830
	}

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

	return len;
}

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;
	s32 delta;

	delta = (s32) be32_to_cpu(rsp->req_lim_delta);

	spin_lock_irqsave(target->scsi_host->host_lock, flags);

	target->req_lim += delta;

	req = &target->req_ring[rsp->tag & ~SRP_TAG_TSK_MGMT];

	if (unlikely(rsp->tag & SRP_TAG_TSK_MGMT)) {
		if (be32_to_cpu(rsp->resp_data_len) < 4)
			req->tsk_status = -1;
		else
			req->tsk_status = rsp->data[3];
		complete(&req->done);
	} else {
831
		scmnd = req->scmnd;
832
		if (!scmnd)
833 834 835
			shost_printk(KERN_ERR, target->scsi_host,
				     "Null scmnd for RSP w/tag %016llx\n",
				     (unsigned long long) rsp->tag);
836 837 838 839 840 841 842 843 844 845
		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))
846
			scsi_set_resid(scmnd, be32_to_cpu(rsp->data_out_res_cnt));
847
		else if (rsp->flags & (SRP_RSP_FLAG_DIOVER | SRP_RSP_FLAG_DIUNDER))
848
			scsi_set_resid(scmnd, be32_to_cpu(rsp->data_in_res_cnt));
849 850 851 852 853

		if (!req->tsk_mgmt) {
			scmnd->host_scribble = (void *) -1L;
			scmnd->scsi_done(scmnd);

854
			srp_remove_req(target, req);
855 856 857 858 859 860 861 862 863
		} else
			req->cmd_done = 1;
	}

	spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
}

static void srp_handle_recv(struct srp_target_port *target, struct ib_wc *wc)
{
864
	struct ib_device *dev;
865 866 867
	struct srp_iu *iu;
	u8 opcode;

868
	iu = target->rx_ring[wc->wr_id];
869

870
	dev = target->srp_host->srp_dev->dev;
871 872
	ib_dma_sync_single_for_cpu(dev, iu->dma, target->max_ti_iu_len,
				   DMA_FROM_DEVICE);
873 874 875 876 877 878

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

	if (0) {
		int i;

879 880
		shost_printk(KERN_ERR, target->scsi_host,
			     PFX "recv completion, opcode 0x%02x\n", opcode);
881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900

		for (i = 0; i < wc->byte_len; ++i) {
			if (i % 8 == 0)
				printk(KERN_ERR "  [%02x] ", i);
			printk(" %02x", ((u8 *) iu->buf)[i]);
			if ((i + 1) % 8 == 0)
				printk("\n");
		}

		if (wc->byte_len % 8)
			printk("\n");
	}

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

	case SRP_T_LOGOUT:
		/* XXX Handle target logout */
901 902
		shost_printk(KERN_WARNING, target->scsi_host,
			     PFX "Got target logout request\n");
903 904 905
		break;

	default:
906 907
		shost_printk(KERN_WARNING, target->scsi_host,
			     PFX "Unhandled SRP opcode 0x%02x\n", opcode);
908 909 910
		break;
	}

911 912
	ib_dma_sync_single_for_device(dev, iu->dma, target->max_ti_iu_len,
				      DMA_FROM_DEVICE);
913 914
}

915
static void srp_recv_completion(struct ib_cq *cq, void *target_ptr)
916 917 918 919 920 921 922
{
	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) {
923
			shost_printk(KERN_ERR, target->scsi_host,
924
				     PFX "failed receive status %d\n",
925
				     wc.status);
926
			target->qp_in_error = 1;
927 928 929
			break;
		}

930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948
		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;

	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;
		}

		++target->tx_tail;
949 950 951 952 953 954 955 956 957 958 959 960
	}
}

static int __srp_post_recv(struct srp_target_port *target)
{
	struct srp_iu *iu;
	struct ib_sge list;
	struct ib_recv_wr wr, *bad_wr;
	unsigned int next;
	int ret;

	next 	 = target->rx_head & (SRP_RQ_SIZE - 1);
961
	wr.wr_id = next;
962 963 964 965
	iu 	 = target->rx_ring[next];

	list.addr   = iu->dma;
	list.length = iu->size;
966
	list.lkey   = target->srp_host->srp_dev->mr->lkey;
967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992

	wr.next     = NULL;
	wr.sg_list  = &list;
	wr.num_sge  = 1;

	ret = ib_post_recv(target->qp, &wr, &bad_wr);
	if (!ret)
		++target->rx_head;

	return ret;
}

static int srp_post_recv(struct srp_target_port *target)
{
	unsigned long flags;
	int ret;

	spin_lock_irqsave(target->scsi_host->host_lock, flags);
	ret = __srp_post_recv(target);
	spin_unlock_irqrestore(target->scsi_host->host_lock, flags);

	return ret;
}

/*
 * Must be called with target->scsi_host->host_lock held to protect
993 994
 * req_lim and tx_head.  Lock cannot be dropped between call here and
 * call to __srp_post_send().
995
 */
996 997
static struct srp_iu *__srp_get_tx_iu(struct srp_target_port *target,
					enum srp_request_type req_type)
998
{
999 1000
	s32 min = (req_type == SRP_REQ_TASK_MGMT) ? 1 : 2;

1001 1002
	srp_send_completion(target->send_cq, target);

1003 1004 1005
	if (target->tx_head - target->tx_tail >= SRP_SQ_SIZE)
		return NULL;

1006
	if (target->req_lim < min) {
1007
		++target->zero_req_lim;
1008 1009
		return NULL;
	}
1010

1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026
	return target->tx_ring[target->tx_head & SRP_SQ_SIZE];
}

/*
 * Must be called with target->scsi_host->host_lock held to protect
 * req_lim and tx_head.
 */
static int __srp_post_send(struct srp_target_port *target,
			   struct srp_iu *iu, int len)
{
	struct ib_sge list;
	struct ib_send_wr wr, *bad_wr;
	int ret = 0;

	list.addr   = iu->dma;
	list.length = len;
1027
	list.lkey   = target->srp_host->srp_dev->mr->lkey;
1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052

	wr.next       = NULL;
	wr.wr_id      = target->tx_head & SRP_SQ_SIZE;
	wr.sg_list    = &list;
	wr.num_sge    = 1;
	wr.opcode     = IB_WR_SEND;
	wr.send_flags = IB_SEND_SIGNALED;

	ret = ib_post_send(target->qp, &wr, &bad_wr);

	if (!ret) {
		++target->tx_head;
		--target->req_lim;
	}

	return ret;
}

static int srp_queuecommand(struct scsi_cmnd *scmnd,
			    void (*done)(struct scsi_cmnd *))
{
	struct srp_target_port *target = host_to_target(scmnd->device->host);
	struct srp_request *req;
	struct srp_iu *iu;
	struct srp_cmd *cmd;
1053
	struct ib_device *dev;
1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065
	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;
		done(scmnd);
		return 0;
	}

1066
	iu = __srp_get_tx_iu(target, SRP_REQ_NORMAL);
1067 1068 1069
	if (!iu)
		goto err;

1070
	dev = target->srp_host->srp_dev->dev;
1071 1072
	ib_dma_sync_single_for_cpu(dev, iu->dma, srp_max_iu_len,
				   DMA_TO_DEVICE);
1073

1074
	req = list_entry(target->free_reqs.next, struct srp_request, list);
1075 1076 1077

	scmnd->scsi_done     = done;
	scmnd->result        = 0;
1078
	scmnd->host_scribble = (void *) (long) req->index;
1079 1080 1081 1082 1083 1084

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

	cmd->opcode = SRP_CMD;
	cmd->lun    = cpu_to_be64((u64) scmnd->device->lun << 48);
1085
	cmd->tag    = req->index;
1086 1087 1088 1089 1090 1091 1092 1093 1094
	memcpy(cmd->cdb, scmnd->cmnd, scmnd->cmd_len);

	req->scmnd    = scmnd;
	req->cmd      = iu;
	req->cmd_done = 0;
	req->tsk_mgmt = NULL;

	len = srp_map_data(scmnd, target, req);
	if (len < 0) {
1095 1096
		shost_printk(KERN_ERR, target->scsi_host,
			     PFX "Failed to map data\n");
1097 1098 1099 1100
		goto err;
	}

	if (__srp_post_recv(target)) {
1101
		shost_printk(KERN_ERR, target->scsi_host, PFX "Recv failed\n");
1102 1103 1104
		goto err_unmap;
	}

1105 1106
	ib_dma_sync_single_for_device(dev, iu->dma, srp_max_iu_len,
				      DMA_TO_DEVICE);
1107 1108

	if (__srp_post_send(target, iu, len)) {
1109
		shost_printk(KERN_ERR, target->scsi_host, PFX "Send failed\n");
1110 1111 1112
		goto err_unmap;
	}

1113
	list_move_tail(&req->list, &target->req_queue);
1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137

	return 0;

err_unmap:
	srp_unmap_data(scmnd, target, req);

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;
	}

	for (i = 0; i < SRP_SQ_SIZE + 1; ++i) {
		target->tx_ring[i] = srp_alloc_iu(target->srp_host,
1138
						  srp_max_iu_len,
1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163
						  GFP_KERNEL, DMA_TO_DEVICE);
		if (!target->tx_ring[i])
			goto err;
	}

	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;
	}

	for (i = 0; i < SRP_SQ_SIZE + 1; ++i) {
		srp_free_iu(target->srp_host, target->tx_ring[i]);
		target->tx_ring[i] = NULL;
	}

	return -ENOMEM;
}

static void srp_cm_rej_handler(struct ib_cm_id *cm_id,
			       struct ib_cm_event *event,
			       struct srp_target_port *target)
{
1164
	struct Scsi_Host *shost = target->scsi_host;
1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180
	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:
1181
		if (srp_target_is_topspin(target)) {
1182 1183 1184 1185 1186 1187 1188 1189
			/*
			 * 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);

1190 1191 1192 1193
			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));
1194 1195 1196

			target->status = SRP_PORT_REDIRECT;
		} else {
1197 1198
			shost_printk(KERN_WARNING, shost,
				     "  REJ reason: IB_CM_REJ_PORT_REDIRECT\n");
1199 1200 1201 1202 1203
			target->status = -ECONNRESET;
		}
		break;

	case IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID:
1204 1205
		shost_printk(KERN_WARNING, shost,
			    "  REJ reason: IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID\n");
1206 1207 1208 1209 1210 1211 1212 1213 1214 1215
		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)
1216 1217
				shost_printk(KERN_WARNING, shost,
					     PFX "SRP_LOGIN_REJ: requested max_it_iu_len too large\n");
1218
			else
1219 1220
				shost_printk(KERN_WARNING, shost,
					    PFX "SRP LOGIN REJECTED, reason 0x%08x\n", reason);
1221
		} else
1222 1223 1224
			shost_printk(KERN_WARNING, shost,
				     "  REJ reason: IB_CM_REJ_CONSUMER_DEFINED,"
				     " opcode 0x%02x\n", opcode);
1225 1226 1227
		target->status = -ECONNRESET;
		break;

D
David Dillow 已提交
1228 1229 1230 1231 1232
	case IB_CM_REJ_STALE_CONN:
		shost_printk(KERN_WARNING, shost, "  REJ reason: stale connection\n");
		target->status = SRP_STALE_CONN;
		break;

1233
	default:
1234 1235
		shost_printk(KERN_WARNING, shost, "  REJ reason 0x%x\n",
			     event->param.rej_rcvd.reason);
1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249
		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;
	struct ib_qp_attr *qp_attr = NULL;
	int attr_mask = 0;
	int comp = 0;
	int opcode = 0;

	switch (event->event) {
	case IB_CM_REQ_ERROR:
1250 1251
		shost_printk(KERN_DEBUG, target->scsi_host,
			     PFX "Sending CM REQ failed\n");
1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268
		comp = 1;
		target->status = -ECONNRESET;
		break;

	case IB_CM_REP_RECEIVED:
		comp = 1;
		opcode = *(u8 *) event->private_data;

		if (opcode == SRP_LOGIN_RSP) {
			struct srp_login_rsp *rsp = event->private_data;

			target->max_ti_iu_len = be32_to_cpu(rsp->max_ti_iu_len);
			target->req_lim       = be32_to_cpu(rsp->req_lim_delta);

			target->scsi_host->can_queue = min(target->req_lim,
							   target->scsi_host->can_queue);
		} else {
1269 1270
			shost_printk(KERN_WARNING, target->scsi_host,
				    PFX "Unhandled RSP opcode %#x\n", opcode);
1271 1272 1273 1274
			target->status = -ECONNRESET;
			break;
		}

V
Vu Pham 已提交
1275 1276 1277 1278 1279
		if (!target->rx_ring[0]) {
			target->status = srp_alloc_iu_bufs(target);
			if (target->status)
				break;
		}
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 1313 1314 1315

		qp_attr = kmalloc(sizeof *qp_attr, GFP_KERNEL);
		if (!qp_attr) {
			target->status = -ENOMEM;
			break;
		}

		qp_attr->qp_state = IB_QPS_RTR;
		target->status = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
		if (target->status)
			break;

		target->status = ib_modify_qp(target->qp, qp_attr, attr_mask);
		if (target->status)
			break;

		target->status = srp_post_recv(target);
		if (target->status)
			break;

		qp_attr->qp_state = IB_QPS_RTS;
		target->status = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
		if (target->status)
			break;

		target->status = ib_modify_qp(target->qp, qp_attr, attr_mask);
		if (target->status)
			break;

		target->status = ib_send_cm_rtu(cm_id, NULL, 0);
		if (target->status)
			break;

		break;

	case IB_CM_REJ_RECEIVED:
1316
		shost_printk(KERN_DEBUG, target->scsi_host, PFX "REJ received\n");
1317 1318 1319 1320 1321
		comp = 1;

		srp_cm_rej_handler(cm_id, event, target);
		break;

1322
	case IB_CM_DREQ_RECEIVED:
1323 1324
		shost_printk(KERN_WARNING, target->scsi_host,
			     PFX "DREQ received - connection closed\n");
1325
		if (ib_send_cm_drep(cm_id, NULL, 0))
1326 1327
			shost_printk(KERN_ERR, target->scsi_host,
				     PFX "Sending CM DREP failed\n");
1328 1329 1330
		break;

	case IB_CM_TIMEWAIT_EXIT:
1331 1332
		shost_printk(KERN_ERR, target->scsi_host,
			     PFX "connection closed\n");
1333 1334 1335 1336 1337

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

1338 1339 1340 1341 1342
	case IB_CM_MRA_RECEIVED:
	case IB_CM_DREQ_ERROR:
	case IB_CM_DREP_RECEIVED:
		break;

1343
	default:
1344 1345
		shost_printk(KERN_WARNING, target->scsi_host,
			     PFX "Unhandled CM event %d\n", event->event);
1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356
		break;
	}

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

	kfree(qp_attr);

	return 0;
}

1357 1358
static int srp_send_tsk_mgmt(struct srp_target_port *target,
			     struct srp_request *req, u8 func)
1359 1360 1361 1362 1363 1364
{
	struct srp_iu *iu;
	struct srp_tsk_mgmt *tsk_mgmt;

	spin_lock_irq(target->scsi_host->host_lock);

1365 1366
	if (target->state == SRP_TARGET_DEAD ||
	    target->state == SRP_TARGET_REMOVED) {
1367
		req->scmnd->result = DID_BAD_TARGET << 16;
1368 1369 1370
		goto out;
	}

1371 1372
	init_completion(&req->done);

1373
	iu = __srp_get_tx_iu(target, SRP_REQ_TASK_MGMT);
1374 1375 1376 1377 1378 1379 1380
	if (!iu)
		goto out;

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

	tsk_mgmt->opcode 	= SRP_TSK_MGMT;
1381 1382
	tsk_mgmt->lun 		= cpu_to_be64((u64) req->scmnd->device->lun << 48);
	tsk_mgmt->tag 		= req->index | SRP_TAG_TSK_MGMT;
1383
	tsk_mgmt->tsk_mgmt_func = func;
1384
	tsk_mgmt->task_tag 	= req->index;
1385 1386 1387 1388 1389 1390 1391

	if (__srp_post_send(target, iu, sizeof *tsk_mgmt))
		goto out;

	req->tsk_mgmt = iu;

	spin_unlock_irq(target->scsi_host->host_lock);
1392

1393 1394
	if (!wait_for_completion_timeout(&req->done,
					 msecs_to_jiffies(SRP_ABORT_TIMEOUT_MS)))
1395
		return -1;
1396

1397
	return 0;
1398 1399 1400

out:
	spin_unlock_irq(target->scsi_host->host_lock);
1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413
	return -1;
}

static int srp_find_req(struct srp_target_port *target,
			struct scsi_cmnd *scmnd,
			struct srp_request **req)
{
	if (scmnd->host_scribble == (void *) -1L)
		return -1;

	*req = &target->req_ring[(long) scmnd->host_scribble];

	return 0;
1414 1415 1416 1417
}

static int srp_abort(struct scsi_cmnd *scmnd)
{
1418 1419 1420 1421
	struct srp_target_port *target = host_to_target(scmnd->device->host);
	struct srp_request *req;
	int ret = SUCCESS;

1422
	shost_printk(KERN_ERR, target->scsi_host, "SRP abort called\n");
1423

1424 1425
	if (target->qp_in_error)
		return FAILED;
1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444
	if (srp_find_req(target, scmnd, &req))
		return FAILED;
	if (srp_send_tsk_mgmt(target, req, SRP_TSK_ABORT_TASK))
		return FAILED;

	spin_lock_irq(target->scsi_host->host_lock);

	if (req->cmd_done) {
		srp_remove_req(target, req);
		scmnd->scsi_done(scmnd);
	} else if (!req->tsk_status) {
		srp_remove_req(target, req);
		scmnd->result = DID_ABORT << 16;
	} else
		ret = FAILED;

	spin_unlock_irq(target->scsi_host->host_lock);

	return ret;
1445 1446 1447 1448
}

static int srp_reset_device(struct scsi_cmnd *scmnd)
{
1449 1450 1451
	struct srp_target_port *target = host_to_target(scmnd->device->host);
	struct srp_request *req, *tmp;

1452
	shost_printk(KERN_ERR, target->scsi_host, "SRP reset_device called\n");
1453

1454 1455
	if (target->qp_in_error)
		return FAILED;
1456 1457 1458 1459 1460 1461 1462 1463 1464 1465
	if (srp_find_req(target, scmnd, &req))
		return FAILED;
	if (srp_send_tsk_mgmt(target, req, SRP_TSK_LUN_RESET))
		return FAILED;
	if (req->tsk_status)
		return FAILED;

	spin_lock_irq(target->scsi_host->host_lock);

	list_for_each_entry_safe(req, tmp, &target->req_queue, list)
1466 1467
		if (req->scmnd->device == scmnd->device)
			srp_reset_req(target, req);
1468 1469 1470 1471

	spin_unlock_irq(target->scsi_host->host_lock);

	return SUCCESS;
1472 1473 1474 1475 1476 1477 1478
}

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

1479
	shost_printk(KERN_ERR, target->scsi_host, PFX "SRP reset_host called\n");
1480 1481 1482 1483 1484 1485 1486

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

	return ret;
}

1487 1488
static ssize_t show_id_ext(struct device *dev, struct device_attribute *attr,
			   char *buf)
1489
{
1490
	struct srp_target_port *target = host_to_target(class_to_shost(dev));
1491 1492 1493 1494 1495 1496 1497 1498 1499

	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));
}

1500 1501
static ssize_t show_ioc_guid(struct device *dev, struct device_attribute *attr,
			     char *buf)
1502
{
1503
	struct srp_target_port *target = host_to_target(class_to_shost(dev));
1504 1505 1506 1507 1508 1509 1510 1511 1512

	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));
}

1513 1514
static ssize_t show_service_id(struct device *dev,
			       struct device_attribute *attr, char *buf)
1515
{
1516
	struct srp_target_port *target = host_to_target(class_to_shost(dev));
1517 1518 1519 1520 1521 1522 1523 1524 1525

	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));
}

1526 1527
static ssize_t show_pkey(struct device *dev, struct device_attribute *attr,
			 char *buf)
1528
{
1529
	struct srp_target_port *target = host_to_target(class_to_shost(dev));
1530 1531 1532 1533 1534 1535 1536 1537

	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));
}

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

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

H
Harvey Harrison 已提交
1547
	return sprintf(buf, "%pI6\n", target->path.dgid.raw);
1548 1549
}

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

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

H
Harvey Harrison 已提交
1559
	return sprintf(buf, "%pI6\n", target->orig_dgid);
1560 1561
}

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

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

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

1574 1575
static ssize_t show_local_ib_port(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

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

1582 1583
static ssize_t show_local_ib_device(struct device *dev,
				    struct device_attribute *attr, char *buf)
1584
{
1585
	struct srp_target_port *target = host_to_target(class_to_shost(dev));
1586

1587
	return sprintf(buf, "%s\n", target->srp_host->srp_dev->dev->name);
1588 1589
}

1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609
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);
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);

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,
	&dev_attr_zero_req_lim,
	&dev_attr_local_ib_port,
	&dev_attr_local_ib_device,
1610 1611 1612
	NULL
};

1613 1614
static struct scsi_host_template srp_template = {
	.module				= THIS_MODULE,
R
Roland Dreier 已提交
1615 1616
	.name				= "InfiniBand SRP initiator",
	.proc_name			= DRV_NAME,
1617 1618 1619 1620 1621 1622 1623 1624
	.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,
	.can_queue			= SRP_SQ_SIZE,
	.this_id			= -1,
	.cmd_per_lun			= SRP_SQ_SIZE,
1625 1626
	.use_clustering			= ENABLE_CLUSTERING,
	.shost_attrs			= srp_host_attrs
1627 1628 1629 1630
};

static int srp_add_target(struct srp_host *host, struct srp_target_port *target)
{
1631 1632 1633
	struct srp_rport_identifiers ids;
	struct srp_rport *rport;

1634 1635 1636
	sprintf(target->target_name, "SRP.T10:%016llX",
		 (unsigned long long) be64_to_cpu(target->id_ext));

1637
	if (scsi_add_host(target->scsi_host, host->srp_dev->dev->dma_device))
1638 1639
		return -ENODEV;

1640 1641
	memcpy(ids.port_id, &target->id_ext, 8);
	memcpy(ids.port_id + 8, &target->ioc_guid, 8);
1642
	ids.roles = SRP_RPORT_ROLE_TARGET;
1643 1644 1645 1646 1647 1648
	rport = srp_rport_add(target->scsi_host, &ids);
	if (IS_ERR(rport)) {
		scsi_remove_host(target->scsi_host);
		return PTR_ERR(rport);
	}

1649
	spin_lock(&host->target_lock);
1650
	list_add_tail(&target->list, &host->target_list);
1651
	spin_unlock(&host->target_lock);
1652 1653 1654 1655

	target->state = SRP_TARGET_LIVE;

	scsi_scan_target(&target->scsi_host->shost_gendev,
1656
			 0, target->scsi_id, SCAN_WILD_CARD, 0);
1657 1658 1659 1660

	return 0;
}

1661
static void srp_release_dev(struct device *dev)
1662 1663
{
	struct srp_host *host =
1664
		container_of(dev, struct srp_host, dev);
1665 1666 1667 1668 1669 1670

	complete(&host->released);
}

static struct class srp_class = {
	.name    = "infiniband_srp",
1671
	.dev_release = srp_release_dev
1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689
};

/*
 * 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,
1690
	SRP_OPT_MAX_CMD_PER_LUN	= 1 << 6,
1691
	SRP_OPT_IO_CLASS	= 1 << 7,
1692
	SRP_OPT_INITIATOR_EXT	= 1 << 8,
1693 1694 1695 1696 1697 1698 1699
	SRP_OPT_ALL		= (SRP_OPT_ID_EXT	|
				   SRP_OPT_IOC_GUID	|
				   SRP_OPT_DGID		|
				   SRP_OPT_PKEY		|
				   SRP_OPT_SERVICE_ID),
};

1700
static const match_table_t srp_opt_tokens = {
1701 1702 1703 1704 1705 1706 1707
	{ 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" 	},
1708
	{ SRP_OPT_IO_CLASS,		"io_class=%x"		},
1709
	{ SRP_OPT_INITIATOR_EXT,	"initiator_ext=%s"	},
1710
	{ SRP_OPT_ERR,			NULL 			}
1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738
};

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);
1739 1740 1741 1742
			if (!p) {
				ret = -ENOMEM;
				goto out;
			}
1743 1744 1745 1746 1747 1748
			target->id_ext = cpu_to_be64(simple_strtoull(p, NULL, 16));
			kfree(p);
			break;

		case SRP_OPT_IOC_GUID:
			p = match_strdup(args);
1749 1750 1751 1752
			if (!p) {
				ret = -ENOMEM;
				goto out;
			}
1753 1754 1755 1756 1757 1758
			target->ioc_guid = cpu_to_be64(simple_strtoull(p, NULL, 16));
			kfree(p);
			break;

		case SRP_OPT_DGID:
			p = match_strdup(args);
1759 1760 1761 1762
			if (!p) {
				ret = -ENOMEM;
				goto out;
			}
1763 1764
			if (strlen(p) != 32) {
				printk(KERN_WARNING PFX "bad dest GID parameter '%s'\n", p);
1765
				kfree(p);
1766 1767 1768 1769 1770 1771 1772
				goto out;
			}

			for (i = 0; i < 16; ++i) {
				strlcpy(dgid, p + i * 2, 3);
				target->path.dgid.raw[i] = simple_strtoul(dgid, NULL, 16);
			}
1773
			kfree(p);
1774
			memcpy(target->orig_dgid, target->path.dgid.raw, 16);
1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786
			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);
1787 1788 1789 1790
			if (!p) {
				ret = -ENOMEM;
				goto out;
			}
1791
			target->service_id = cpu_to_be64(simple_strtoull(p, NULL, 16));
1792
			target->path.service_id = target->service_id;
1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803
			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;

1804 1805 1806 1807 1808 1809 1810 1811
		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;
			}
			target->scsi_host->cmd_per_lun = min(token, SRP_SQ_SIZE);
			break;

1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826
		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;

1827 1828
		case SRP_OPT_INITIATOR_EXT:
			p = match_strdup(args);
1829 1830 1831 1832
			if (!p) {
				ret = -ENOMEM;
				goto out;
			}
1833 1834 1835 1836
			target->initiator_ext = cpu_to_be64(simple_strtoull(p, NULL, 16));
			kfree(p);
			break;

1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856 1857 1858
		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;
}

1859 1860
static ssize_t srp_create_target(struct device *dev,
				 struct device_attribute *attr,
1861 1862 1863
				 const char *buf, size_t count)
{
	struct srp_host *host =
1864
		container_of(dev, struct srp_host, dev);
1865 1866 1867 1868 1869 1870 1871 1872 1873 1874
	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;

1875
	target_host->transportt = ib_srp_transport_template;
A
Arne Redlich 已提交
1876 1877
	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
1878

1879 1880
	target = host_to_target(target_host);

1881
	target->io_class   = SRP_REV16A_IB_IO_CLASS;
1882 1883 1884
	target->scsi_host  = target_host;
	target->srp_host   = host;

1885
	INIT_LIST_HEAD(&target->free_reqs);
1886
	INIT_LIST_HEAD(&target->req_queue);
1887 1888 1889 1890
	for (i = 0; i < SRP_SQ_SIZE; ++i) {
		target->req_ring[i].index = i;
		list_add_tail(&target->req_ring[i].list, &target->free_reqs);
	}
1891 1892 1893 1894 1895

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

1896
	ib_query_gid(host->srp_dev->dev, host->port, 0, &target->path.sgid);
1897

1898 1899
	shost_printk(KERN_DEBUG, target->scsi_host, PFX
		     "new target: id_ext %016llx ioc_guid %016llx pkey %04x "
H
Harvey Harrison 已提交
1900
		     "service_id %016llx dgid %pI6\n",
1901 1902 1903 1904
	       (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),
1905
	       target->path.dgid.raw);
1906 1907 1908 1909 1910

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

D
David Dillow 已提交
1911 1912
	ret = srp_new_cm_id(target);
	if (ret)
1913 1914
		goto err_free;

1915
	target->qp_in_error = 0;
1916 1917
	ret = srp_connect_target(target);
	if (ret) {
1918 1919
		shost_printk(KERN_ERR, target->scsi_host,
			     PFX "Connection failed\n");
1920 1921 1922 1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943
		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;
}

1944
static DEVICE_ATTR(add_target, S_IWUSR, NULL, srp_create_target);
1945

1946 1947
static ssize_t show_ibdev(struct device *dev, struct device_attribute *attr,
			  char *buf)
1948
{
1949
	struct srp_host *host = container_of(dev, struct srp_host, dev);
1950

1951
	return sprintf(buf, "%s\n", host->srp_dev->dev->name);
1952 1953
}

1954
static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
1955

1956 1957
static ssize_t show_port(struct device *dev, struct device_attribute *attr,
			 char *buf)
1958
{
1959
	struct srp_host *host = container_of(dev, struct srp_host, dev);
1960 1961 1962 1963

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

1964
static DEVICE_ATTR(port, S_IRUGO, show_port, NULL);
1965

1966
static struct srp_host *srp_add_port(struct srp_device *device, u8 port)
1967 1968 1969 1970 1971 1972 1973 1974
{
	struct srp_host *host;

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

	INIT_LIST_HEAD(&host->target_list);
1975
	spin_lock_init(&host->target_lock);
1976
	init_completion(&host->released);
1977
	host->srp_dev = device;
1978 1979
	host->port = port;

1980 1981
	host->dev.class = &srp_class;
	host->dev.parent = device->dev->dma_device;
1982
	dev_set_name(&host->dev, "srp-%s-%d", device->dev->name, port);
1983

1984
	if (device_register(&host->dev))
1985
		goto free_host;
1986
	if (device_create_file(&host->dev, &dev_attr_add_target))
1987
		goto err_class;
1988
	if (device_create_file(&host->dev, &dev_attr_ibdev))
1989
		goto err_class;
1990
	if (device_create_file(&host->dev, &dev_attr_port))
1991 1992 1993 1994 1995
		goto err_class;

	return host;

err_class:
1996
	device_unregister(&host->dev);
1997

1998
free_host:
1999 2000 2001 2002 2003 2004 2005
	kfree(host);

	return NULL;
}

static void srp_add_one(struct ib_device *device)
{
2006 2007 2008
	struct srp_device *srp_dev;
	struct ib_device_attr *dev_attr;
	struct ib_fmr_pool_param fmr_param;
2009 2010 2011
	struct srp_host *host;
	int s, e, p;

2012 2013
	dev_attr = kmalloc(sizeof *dev_attr, GFP_KERNEL);
	if (!dev_attr)
2014
		return;
2015

2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032
	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;
2033
	srp_dev->fmr_page_mask  = ~((u64) srp_dev->fmr_page_size - 1);
2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060 2061

	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;
2062

T
Tom Tucker 已提交
2063
	if (device->node_type == RDMA_NODE_IB_SWITCH) {
2064 2065 2066 2067 2068 2069 2070 2071
		s = 0;
		e = 0;
	} else {
		s = 1;
		e = device->phys_port_cnt;
	}

	for (p = s; p <= e; ++p) {
2072
		host = srp_add_port(srp_dev, p);
2073
		if (host)
2074
			list_add_tail(&host->list, &srp_dev->dev_list);
2075 2076
	}

2077 2078 2079 2080 2081 2082 2083 2084 2085 2086 2087 2088
	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);
2089 2090 2091 2092
}

static void srp_remove_one(struct ib_device *device)
{
2093
	struct srp_device *srp_dev;
2094 2095 2096 2097
	struct srp_host *host, *tmp_host;
	LIST_HEAD(target_list);
	struct srp_target_port *target, *tmp_target;

2098
	srp_dev = ib_get_client_data(device, &srp_client);
2099

2100
	list_for_each_entry_safe(host, tmp_host, &srp_dev->dev_list, list) {
2101
		device_unregister(&host->dev);
2102 2103 2104 2105 2106 2107 2108 2109 2110 2111
		/*
		 * 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.
		 */
2112
		spin_lock(&host->target_lock);
2113
		list_for_each_entry(target, &host->target_list, list) {
2114 2115 2116
			spin_lock_irq(target->scsi_host->host_lock);
			target->state = SRP_TARGET_REMOVED;
			spin_unlock_irq(target->scsi_host->host_lock);
2117
		}
2118
		spin_unlock(&host->target_lock);
2119 2120 2121 2122 2123 2124 2125 2126 2127 2128

		/*
		 * Wait for any reconnection tasks that may have
		 * started before we marked our target ports as
		 * removed, and any target port removal tasks.
		 */
		flush_scheduled_work();

		list_for_each_entry_safe(target, tmp_target,
					 &host->target_list, list) {
2129
			srp_remove_host(target->scsi_host);
2130
			scsi_remove_host(target->scsi_host);
2131 2132 2133 2134 2135 2136 2137 2138 2139
			srp_disconnect_target(target);
			ib_destroy_cm_id(target->cm_id);
			srp_free_target_ib(target);
			scsi_host_put(target->scsi_host);
		}

		kfree(host);
	}

2140 2141 2142 2143 2144 2145
	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);
2146 2147
}

2148 2149 2150
static struct srp_function_template ib_srp_transport_functions = {
};

2151 2152 2153 2154
static int __init srp_init_module(void)
{
	int ret;

2155 2156 2157 2158 2159
	if (srp_sg_tablesize > 255) {
		printk(KERN_WARNING PFX "Clamping srp_sg_tablesize to 255\n");
		srp_sg_tablesize = 255;
	}

2160 2161 2162 2163 2164
	ib_srp_transport_template =
		srp_attach_transport(&ib_srp_transport_functions);
	if (!ib_srp_transport_template)
		return -ENOMEM;

2165 2166 2167 2168 2169
	srp_template.sg_tablesize = srp_sg_tablesize;
	srp_max_iu_len = (sizeof (struct srp_cmd) +
			  sizeof (struct srp_indirect_buf) +
			  srp_sg_tablesize * 16);

2170 2171 2172
	ret = class_register(&srp_class);
	if (ret) {
		printk(KERN_ERR PFX "couldn't register class infiniband_srp\n");
2173
		srp_release_transport(ib_srp_transport_template);
2174 2175 2176
		return ret;
	}

2177 2178
	ib_sa_register_client(&srp_sa_client);

2179 2180 2181
	ret = ib_register_client(&srp_client);
	if (ret) {
		printk(KERN_ERR PFX "couldn't register IB client\n");
2182
		srp_release_transport(ib_srp_transport_template);
2183
		ib_sa_unregister_client(&srp_sa_client);
2184 2185 2186 2187 2188 2189 2190 2191 2192 2193
		class_unregister(&srp_class);
		return ret;
	}

	return 0;
}

static void __exit srp_cleanup_module(void)
{
	ib_unregister_client(&srp_client);
2194
	ib_sa_unregister_client(&srp_sa_client);
2195
	class_unregister(&srp_class);
2196
	srp_release_transport(ib_srp_transport_template);
2197 2198 2199 2200
}

module_init(srp_init_module);
module_exit(srp_cleanup_module);