ib_srp.c 55.4 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.
 *
 * $Id: ib_srp.c 3932 2005-11-01 17:19:29Z roland $
 */

#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 <rdma/ib_cache.h>

#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);
static void srp_completion(struct ib_cq *cq, void *target_ptr);
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_cached_pkey(target->srp_host->srp_dev->dev,
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				  target->srp_host->port,
				  be16_to_cpu(target->path.pkey),
				  &attr->pkey_index);
	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->cq = ib_create_cq(target->srp_host->srp_dev->dev,
				  srp_completion, NULL, target, SRP_CQ_SIZE, 0);
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	if (IS_ERR(target->cq)) {
		ret = PTR_ERR(target->cq);
		goto out;
	}

	ib_req_notify_cq(target->cq, IB_CQ_NEXT_COMP);

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

	ret = srp_init_qp(target, target->qp);
	if (ret) {
		ib_destroy_qp(target->qp);
		ib_destroy_cq(target->cq);
		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);
	ib_destroy_cq(target->cq);

	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.
400
	 */
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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)
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{
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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;

	while (ib_poll_cq(target->cq, 1, &wc) > 0)
		; /* 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;
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		INIT_WORK(&target->work, srp_remove_work);
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		schedule_work(&target->work);
	}
	spin_unlock_irq(target->scsi_host->host_lock);

	return ret;
}

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static int srp_map_fmr(struct srp_target_port *target, struct scatterlist *scat,
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		       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;
633
	struct srp_device *dev = target->srp_host->srp_dev;
634
	struct ib_device *ibdev = dev->dev;
635
	struct scatterlist *sg;
636 637 638 639

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

640 641
	if (srp_target_is_mellanox(target) &&
	    (ib_sg_dma_address(ibdev, &scat[0]) & ~dev->fmr_page_mask))
642 643
		return -EINVAL;

644
	len = page_cnt = 0;
645 646
	scsi_for_each_sg(req->scmnd, sg, sg_cnt, i) {
		unsigned int dma_len = ib_sg_dma_len(ibdev, sg);
647

648
		if (ib_sg_dma_address(ibdev, sg) & ~dev->fmr_page_mask) {
649 650 651 652 653
			if (i > 0)
				return -EINVAL;
			else
				++page_cnt;
		}
654
		if ((ib_sg_dma_address(ibdev, sg) + dma_len) &
655 656 657 658 659 660 661
		    ~dev->fmr_page_mask) {
			if (i < sg_cnt - 1)
				return -EINVAL;
			else
				++page_cnt;
		}

662
		len += dma_len;
663 664 665 666 667 668 669 670 671 672 673
	}

	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;
674 675
	scsi_for_each_sg(req->scmnd, sg, sg_cnt, i) {
		unsigned int dma_len = ib_sg_dma_len(ibdev, sg);
676 677

		for (j = 0; j < dma_len; j += dev->fmr_page_size)
678
			dma_pages[page_cnt++] =
679
				(ib_sg_dma_address(ibdev, sg) &
680 681
				 dev->fmr_page_mask) + j;
	}
682 683

	req->fmr = ib_fmr_pool_map_phys(dev->fmr_pool,
684
					dma_pages, page_cnt, io_addr);
685 686
	if (IS_ERR(req->fmr)) {
		ret = PTR_ERR(req->fmr);
V
Vu Pham 已提交
687
		req->fmr = NULL;
688 689 690
		goto out;
	}

691 692
	buf->va  = cpu_to_be64(ib_sg_dma_address(ibdev, &scat[0]) &
			       ~dev->fmr_page_mask);
693 694 695 696 697 698 699 700 701 702 703
	buf->key = cpu_to_be32(req->fmr->fmr->rkey);
	buf->len = cpu_to_be32(len);

	ret = 0;

out:
	kfree(dma_pages);

	return ret;
}

704 705 706
static int srp_map_data(struct scsi_cmnd *scmnd, struct srp_target_port *target,
			struct srp_request *req)
{
707
	struct scatterlist *scat;
708
	struct srp_cmd *cmd = req->cmd->buf;
709
	int len, nents, count;
710
	u8 fmt = SRP_DATA_DESC_DIRECT;
711 712
	struct srp_device *dev;
	struct ib_device *ibdev;
713

714
	if (!scsi_sglist(scmnd) || scmnd->sc_data_direction == DMA_NONE)
715 716 717 718
		return sizeof (struct srp_cmd);

	if (scmnd->sc_data_direction != DMA_FROM_DEVICE &&
	    scmnd->sc_data_direction != DMA_TO_DEVICE) {
719 720 721
		shost_printk(KERN_WARNING, target->scsi_host,
			     PFX "Unhandled data direction %d\n",
			     scmnd->sc_data_direction);
722 723 724
		return -EINVAL;
	}

725 726
	nents = scsi_sg_count(scmnd);
	scat  = scsi_sglist(scmnd);
727

728
	dev = target->srp_host->srp_dev;
729 730 731
	ibdev = dev->dev;

	count = ib_dma_map_sg(ibdev, scat, nents, scmnd->sc_data_direction);
732 733 734

	fmt = SRP_DATA_DESC_DIRECT;
	len = sizeof (struct srp_cmd) +	sizeof (struct srp_direct_buf);
735

736
	if (count == 1) {
737 738 739 740 741 742
		/*
		 * 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.
		 */
743
		struct srp_direct_buf *buf = (void *) cmd->add_data;
744

745 746 747
		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));
748
	} else if (srp_map_fmr(target, scat, count, req,
749 750 751 752 753 754
			       (void *) cmd->add_data)) {
		/*
		 * FMR mapping failed, and the scatterlist has more
		 * than one entry.  Generate an indirect memory
		 * descriptor.
		 */
755
		struct srp_indirect_buf *buf = (void *) cmd->add_data;
756
		struct scatterlist *sg;
757
		u32 datalen = 0;
758
		int i;
759

760
		fmt = SRP_DATA_DESC_INDIRECT;
761 762 763 764
		len = sizeof (struct srp_cmd) +
			sizeof (struct srp_indirect_buf) +
			count * sizeof (struct srp_direct_buf);

765 766
		scsi_for_each_sg(scmnd, sg, count, i) {
			unsigned int dma_len = ib_sg_dma_len(ibdev, sg);
767

768
			buf->desc_list[i].va  =
769
				cpu_to_be64(ib_sg_dma_address(ibdev, sg));
770
			buf->desc_list[i].key =
771 772 773
				cpu_to_be32(dev->mr->rkey);
			buf->desc_list[i].len = cpu_to_be32(dma_len);
			datalen += dma_len;
774
		}
775

776 777 778 779 780
		if (scmnd->sc_data_direction == DMA_TO_DEVICE)
			cmd->data_out_desc_cnt = count;
		else
			cmd->data_in_desc_cnt = count;

781 782
		buf->table_desc.va  =
			cpu_to_be64(req->cmd->dma + sizeof *cmd + sizeof *buf);
783
		buf->table_desc.key =
784
			cpu_to_be32(target->srp_host->srp_dev->mr->rkey);
785 786 787 788
		buf->table_desc.len =
			cpu_to_be32(count * sizeof (struct srp_direct_buf));

		buf->len = cpu_to_be32(datalen);
789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820
	}

	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 {
821
		scmnd = req->scmnd;
822
		if (!scmnd)
823 824 825
			shost_printk(KERN_ERR, target->scsi_host,
				     "Null scmnd for RSP w/tag %016llx\n",
				     (unsigned long long) rsp->tag);
826 827 828 829 830 831 832 833 834 835
		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))
836
			scsi_set_resid(scmnd, be32_to_cpu(rsp->data_out_res_cnt));
837
		else if (rsp->flags & (SRP_RSP_FLAG_DIOVER | SRP_RSP_FLAG_DIUNDER))
838
			scsi_set_resid(scmnd, be32_to_cpu(rsp->data_in_res_cnt));
839 840 841 842 843

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

844
			srp_remove_req(target, req);
845 846 847 848 849 850 851 852 853
		} 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)
{
854
	struct ib_device *dev;
855 856 857 858 859
	struct srp_iu *iu;
	u8 opcode;

	iu = target->rx_ring[wc->wr_id & ~SRP_OP_RECV];

860
	dev = target->srp_host->srp_dev->dev;
861 862
	ib_dma_sync_single_for_cpu(dev, iu->dma, target->max_ti_iu_len,
				   DMA_FROM_DEVICE);
863 864 865 866 867 868

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

	if (0) {
		int i;

869 870
		shost_printk(KERN_ERR, target->scsi_host,
			     PFX "recv completion, opcode 0x%02x\n", opcode);
871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890

		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 */
891 892
		shost_printk(KERN_WARNING, target->scsi_host,
			     PFX "Got target logout request\n");
893 894 895
		break;

	default:
896 897
		shost_printk(KERN_WARNING, target->scsi_host,
			     PFX "Unhandled SRP opcode 0x%02x\n", opcode);
898 899 900
		break;
	}

901 902
	ib_dma_sync_single_for_device(dev, iu->dma, target->max_ti_iu_len,
				      DMA_FROM_DEVICE);
903 904 905 906 907 908 909 910 911 912
}

static void srp_completion(struct ib_cq *cq, void *target_ptr)
{
	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) {
913 914 915 916
			shost_printk(KERN_ERR, target->scsi_host,
				     PFX "failed %s status %d\n",
				     wc.wr_id & SRP_OP_RECV ? "receive" : "send",
				     wc.status);
917
			target->qp_in_error = 1;
918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941
			break;
		}

		if (wc.wr_id & SRP_OP_RECV)
			srp_handle_recv(target, &wc);
		else
			++target->tx_tail;
	}
}

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);
	wr.wr_id = next | SRP_OP_RECV;
	iu 	 = target->rx_ring[next];

	list.addr   = iu->dma;
	list.length = iu->size;
942
	list.lkey   = target->srp_host->srp_dev->mr->lkey;
943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968

	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
969 970
 * req_lim and tx_head.  Lock cannot be dropped between call here and
 * call to __srp_post_send().
971
 */
972 973
static struct srp_iu *__srp_get_tx_iu(struct srp_target_port *target,
					enum srp_request_type req_type)
974
{
975 976
	s32 min = (req_type == SRP_REQ_TASK_MGMT) ? 1 : 2;

977 978 979
	if (target->tx_head - target->tx_tail >= SRP_SQ_SIZE)
		return NULL;

980
	if (target->req_lim < min) {
981
		++target->zero_req_lim;
982 983
		return NULL;
	}
984

985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000
	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;
1001
	list.lkey   = target->srp_host->srp_dev->mr->lkey;
1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026

	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;
1027
	struct ib_device *dev;
1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039
	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;
	}

1040
	iu = __srp_get_tx_iu(target, SRP_REQ_NORMAL);
1041 1042 1043
	if (!iu)
		goto err;

1044
	dev = target->srp_host->srp_dev->dev;
1045 1046
	ib_dma_sync_single_for_cpu(dev, iu->dma, srp_max_iu_len,
				   DMA_TO_DEVICE);
1047

1048
	req = list_entry(target->free_reqs.next, struct srp_request, list);
1049 1050 1051

	scmnd->scsi_done     = done;
	scmnd->result        = 0;
1052
	scmnd->host_scribble = (void *) (long) req->index;
1053 1054 1055 1056 1057 1058

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

	cmd->opcode = SRP_CMD;
	cmd->lun    = cpu_to_be64((u64) scmnd->device->lun << 48);
1059
	cmd->tag    = req->index;
1060 1061 1062 1063 1064 1065 1066 1067 1068
	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) {
1069 1070
		shost_printk(KERN_ERR, target->scsi_host,
			     PFX "Failed to map data\n");
1071 1072 1073 1074
		goto err;
	}

	if (__srp_post_recv(target)) {
1075
		shost_printk(KERN_ERR, target->scsi_host, PFX "Recv failed\n");
1076 1077 1078
		goto err_unmap;
	}

1079 1080
	ib_dma_sync_single_for_device(dev, iu->dma, srp_max_iu_len,
				      DMA_TO_DEVICE);
1081 1082

	if (__srp_post_send(target, iu, len)) {
1083
		shost_printk(KERN_ERR, target->scsi_host, PFX "Send failed\n");
1084 1085 1086
		goto err_unmap;
	}

1087
	list_move_tail(&req->list, &target->req_queue);
1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111

	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,
1112
						  srp_max_iu_len,
1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137
						  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)
{
1138
	struct Scsi_Host *shost = target->scsi_host;
1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154
	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:
1155
		if (srp_target_is_topspin(target)) {
1156 1157 1158 1159 1160 1161 1162 1163
			/*
			 * 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);

1164 1165 1166 1167
			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));
1168 1169 1170

			target->status = SRP_PORT_REDIRECT;
		} else {
1171 1172
			shost_printk(KERN_WARNING, shost,
				     "  REJ reason: IB_CM_REJ_PORT_REDIRECT\n");
1173 1174 1175 1176 1177
			target->status = -ECONNRESET;
		}
		break;

	case IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID:
1178 1179
		shost_printk(KERN_WARNING, shost,
			    "  REJ reason: IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID\n");
1180 1181 1182 1183 1184 1185 1186 1187 1188 1189
		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)
1190 1191
				shost_printk(KERN_WARNING, shost,
					     PFX "SRP_LOGIN_REJ: requested max_it_iu_len too large\n");
1192
			else
1193 1194
				shost_printk(KERN_WARNING, shost,
					    PFX "SRP LOGIN REJECTED, reason 0x%08x\n", reason);
1195
		} else
1196 1197 1198
			shost_printk(KERN_WARNING, shost,
				     "  REJ reason: IB_CM_REJ_CONSUMER_DEFINED,"
				     " opcode 0x%02x\n", opcode);
1199 1200 1201
		target->status = -ECONNRESET;
		break;

D
David Dillow 已提交
1202 1203 1204 1205 1206
	case IB_CM_REJ_STALE_CONN:
		shost_printk(KERN_WARNING, shost, "  REJ reason: stale connection\n");
		target->status = SRP_STALE_CONN;
		break;

1207
	default:
1208 1209
		shost_printk(KERN_WARNING, shost, "  REJ reason 0x%x\n",
			     event->param.rej_rcvd.reason);
1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223
		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:
1224 1225
		shost_printk(KERN_DEBUG, target->scsi_host,
			     PFX "Sending CM REQ failed\n");
1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242
		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 {
1243 1244
			shost_printk(KERN_WARNING, target->scsi_host,
				    PFX "Unhandled RSP opcode %#x\n", opcode);
1245 1246 1247 1248
			target->status = -ECONNRESET;
			break;
		}

V
Vu Pham 已提交
1249 1250 1251 1252 1253
		if (!target->rx_ring[0]) {
			target->status = srp_alloc_iu_bufs(target);
			if (target->status)
				break;
		}
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

		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:
1290
		shost_printk(KERN_DEBUG, target->scsi_host, PFX "REJ received\n");
1291 1292 1293 1294 1295
		comp = 1;

		srp_cm_rej_handler(cm_id, event, target);
		break;

1296
	case IB_CM_DREQ_RECEIVED:
1297 1298
		shost_printk(KERN_WARNING, target->scsi_host,
			     PFX "DREQ received - connection closed\n");
1299
		if (ib_send_cm_drep(cm_id, NULL, 0))
1300 1301
			shost_printk(KERN_ERR, target->scsi_host,
				     PFX "Sending CM DREP failed\n");
1302 1303 1304
		break;

	case IB_CM_TIMEWAIT_EXIT:
1305 1306
		shost_printk(KERN_ERR, target->scsi_host,
			     PFX "connection closed\n");
1307 1308 1309 1310 1311

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

1312 1313 1314 1315 1316
	case IB_CM_MRA_RECEIVED:
	case IB_CM_DREQ_ERROR:
	case IB_CM_DREP_RECEIVED:
		break;

1317
	default:
1318 1319
		shost_printk(KERN_WARNING, target->scsi_host,
			     PFX "Unhandled CM event %d\n", event->event);
1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330
		break;
	}

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

	kfree(qp_attr);

	return 0;
}

1331 1332
static int srp_send_tsk_mgmt(struct srp_target_port *target,
			     struct srp_request *req, u8 func)
1333 1334 1335 1336 1337 1338
{
	struct srp_iu *iu;
	struct srp_tsk_mgmt *tsk_mgmt;

	spin_lock_irq(target->scsi_host->host_lock);

1339 1340
	if (target->state == SRP_TARGET_DEAD ||
	    target->state == SRP_TARGET_REMOVED) {
1341
		req->scmnd->result = DID_BAD_TARGET << 16;
1342 1343 1344
		goto out;
	}

1345 1346
	init_completion(&req->done);

1347
	iu = __srp_get_tx_iu(target, SRP_REQ_TASK_MGMT);
1348 1349 1350 1351 1352 1353 1354
	if (!iu)
		goto out;

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

	tsk_mgmt->opcode 	= SRP_TSK_MGMT;
1355 1356
	tsk_mgmt->lun 		= cpu_to_be64((u64) req->scmnd->device->lun << 48);
	tsk_mgmt->tag 		= req->index | SRP_TAG_TSK_MGMT;
1357
	tsk_mgmt->tsk_mgmt_func = func;
1358
	tsk_mgmt->task_tag 	= req->index;
1359 1360 1361 1362 1363 1364 1365

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

	req->tsk_mgmt = iu;

	spin_unlock_irq(target->scsi_host->host_lock);
1366

1367 1368
	if (!wait_for_completion_timeout(&req->done,
					 msecs_to_jiffies(SRP_ABORT_TIMEOUT_MS)))
1369
		return -1;
1370

1371
	return 0;
1372 1373 1374

out:
	spin_unlock_irq(target->scsi_host->host_lock);
1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387
	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;
1388 1389 1390 1391
}

static int srp_abort(struct scsi_cmnd *scmnd)
{
1392 1393 1394 1395
	struct srp_target_port *target = host_to_target(scmnd->device->host);
	struct srp_request *req;
	int ret = SUCCESS;

1396
	shost_printk(KERN_ERR, target->scsi_host, "SRP abort called\n");
1397

1398 1399
	if (target->qp_in_error)
		return FAILED;
1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418
	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;
1419 1420 1421 1422
}

static int srp_reset_device(struct scsi_cmnd *scmnd)
{
1423 1424 1425
	struct srp_target_port *target = host_to_target(scmnd->device->host);
	struct srp_request *req, *tmp;

1426
	shost_printk(KERN_ERR, target->scsi_host, "SRP reset_device called\n");
1427

1428 1429
	if (target->qp_in_error)
		return FAILED;
1430 1431 1432 1433 1434 1435 1436 1437 1438 1439
	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)
1440 1441
		if (req->scmnd->device == scmnd->device)
			srp_reset_req(target, req);
1442 1443 1444 1445

	spin_unlock_irq(target->scsi_host->host_lock);

	return SUCCESS;
1446 1447 1448 1449 1450 1451 1452
}

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

1453
	shost_printk(KERN_ERR, target->scsi_host, PFX "SRP reset_host called\n");
1454 1455 1456 1457 1458 1459 1460

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

	return ret;
}

1461 1462
static ssize_t show_id_ext(struct device *dev, struct device_attribute *attr,
			   char *buf)
1463
{
1464
	struct srp_target_port *target = host_to_target(class_to_shost(dev));
1465 1466 1467 1468 1469 1470 1471 1472 1473

	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));
}

1474 1475
static ssize_t show_ioc_guid(struct device *dev, struct device_attribute *attr,
			     char *buf)
1476
{
1477
	struct srp_target_port *target = host_to_target(class_to_shost(dev));
1478 1479 1480 1481 1482 1483 1484 1485 1486

	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));
}

1487 1488
static ssize_t show_service_id(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->service_id));
}

1500 1501
static ssize_t show_pkey(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

	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));
}

1512 1513
static ssize_t show_dgid(struct device *dev, struct device_attribute *attr,
			 char *buf)
1514
{
1515
	struct srp_target_port *target = host_to_target(class_to_shost(dev));
1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531

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

	return sprintf(buf, "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
		       be16_to_cpu(((__be16 *) target->path.dgid.raw)[0]),
		       be16_to_cpu(((__be16 *) target->path.dgid.raw)[1]),
		       be16_to_cpu(((__be16 *) target->path.dgid.raw)[2]),
		       be16_to_cpu(((__be16 *) target->path.dgid.raw)[3]),
		       be16_to_cpu(((__be16 *) target->path.dgid.raw)[4]),
		       be16_to_cpu(((__be16 *) target->path.dgid.raw)[5]),
		       be16_to_cpu(((__be16 *) target->path.dgid.raw)[6]),
		       be16_to_cpu(((__be16 *) target->path.dgid.raw)[7]));
}

1532 1533
static ssize_t show_orig_dgid(struct device *dev,
			      struct device_attribute *attr, char *buf)
1534
{
1535
	struct srp_target_port *target = host_to_target(class_to_shost(dev));
1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551

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

	return sprintf(buf, "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
		       be16_to_cpu(target->orig_dgid[0]),
		       be16_to_cpu(target->orig_dgid[1]),
		       be16_to_cpu(target->orig_dgid[2]),
		       be16_to_cpu(target->orig_dgid[3]),
		       be16_to_cpu(target->orig_dgid[4]),
		       be16_to_cpu(target->orig_dgid[5]),
		       be16_to_cpu(target->orig_dgid[6]),
		       be16_to_cpu(target->orig_dgid[7]));
}

1552 1553
static ssize_t show_zero_req_lim(struct device *dev,
				 struct device_attribute *attr, char *buf)
1554
{
1555
	struct srp_target_port *target = host_to_target(class_to_shost(dev));
1556 1557 1558 1559 1560 1561 1562 1563

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

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

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

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

1572 1573
static ssize_t show_local_ib_device(struct device *dev,
				    struct device_attribute *attr, char *buf)
1574
{
1575
	struct srp_target_port *target = host_to_target(class_to_shost(dev));
1576

1577
	return sprintf(buf, "%s\n", target->srp_host->srp_dev->dev->name);
1578 1579
}

1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599
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,
1600 1601 1602
	NULL
};

1603 1604
static struct scsi_host_template srp_template = {
	.module				= THIS_MODULE,
R
Roland Dreier 已提交
1605 1606
	.name				= "InfiniBand SRP initiator",
	.proc_name			= DRV_NAME,
1607 1608 1609 1610 1611 1612 1613 1614
	.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,
1615 1616
	.use_clustering			= ENABLE_CLUSTERING,
	.shost_attrs			= srp_host_attrs
1617 1618 1619 1620
};

static int srp_add_target(struct srp_host *host, struct srp_target_port *target)
{
1621 1622 1623
	struct srp_rport_identifiers ids;
	struct srp_rport *rport;

1624 1625 1626
	sprintf(target->target_name, "SRP.T10:%016llX",
		 (unsigned long long) be64_to_cpu(target->id_ext));

1627
	if (scsi_add_host(target->scsi_host, host->srp_dev->dev->dma_device))
1628 1629
		return -ENODEV;

1630 1631
	memcpy(ids.port_id, &target->id_ext, 8);
	memcpy(ids.port_id + 8, &target->ioc_guid, 8);
1632
	ids.roles = SRP_RPORT_ROLE_TARGET;
1633 1634 1635 1636 1637 1638
	rport = srp_rport_add(target->scsi_host, &ids);
	if (IS_ERR(rport)) {
		scsi_remove_host(target->scsi_host);
		return PTR_ERR(rport);
	}

1639
	spin_lock(&host->target_lock);
1640
	list_add_tail(&target->list, &host->target_list);
1641
	spin_unlock(&host->target_lock);
1642 1643 1644 1645

	target->state = SRP_TARGET_LIVE;

	scsi_scan_target(&target->scsi_host->shost_gendev,
1646
			 0, target->scsi_id, SCAN_WILD_CARD, 0);
1647 1648 1649 1650

	return 0;
}

1651
static void srp_release_dev(struct device *dev)
1652 1653
{
	struct srp_host *host =
1654
		container_of(dev, struct srp_host, dev);
1655 1656 1657 1658 1659 1660

	complete(&host->released);
}

static struct class srp_class = {
	.name    = "infiniband_srp",
1661
	.dev_release = srp_release_dev
1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679
};

/*
 * 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,
1680
	SRP_OPT_MAX_CMD_PER_LUN	= 1 << 6,
1681
	SRP_OPT_IO_CLASS	= 1 << 7,
1682
	SRP_OPT_INITIATOR_EXT	= 1 << 8,
1683 1684 1685 1686 1687 1688 1689 1690
	SRP_OPT_ALL		= (SRP_OPT_ID_EXT	|
				   SRP_OPT_IOC_GUID	|
				   SRP_OPT_DGID		|
				   SRP_OPT_PKEY		|
				   SRP_OPT_SERVICE_ID),
};

static match_table_t srp_opt_tokens = {
1691 1692 1693 1694 1695 1696 1697
	{ 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" 	},
1698
	{ SRP_OPT_IO_CLASS,		"io_class=%x"		},
1699
	{ SRP_OPT_INITIATOR_EXT,	"initiator_ext=%s"	},
1700
	{ SRP_OPT_ERR,			NULL 			}
1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728
};

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);
1729 1730 1731 1732
			if (!p) {
				ret = -ENOMEM;
				goto out;
			}
1733 1734 1735 1736 1737 1738
			target->id_ext = cpu_to_be64(simple_strtoull(p, NULL, 16));
			kfree(p);
			break;

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

		case SRP_OPT_DGID:
			p = match_strdup(args);
1749 1750 1751 1752
			if (!p) {
				ret = -ENOMEM;
				goto out;
			}
1753 1754
			if (strlen(p) != 32) {
				printk(KERN_WARNING PFX "bad dest GID parameter '%s'\n", p);
1755
				kfree(p);
1756 1757 1758 1759 1760 1761 1762
				goto out;
			}

			for (i = 0; i < 16; ++i) {
				strlcpy(dgid, p + i * 2, 3);
				target->path.dgid.raw[i] = simple_strtoul(dgid, NULL, 16);
			}
1763
			kfree(p);
1764
			memcpy(target->orig_dgid, target->path.dgid.raw, 16);
1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776
			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);
1777 1778 1779 1780
			if (!p) {
				ret = -ENOMEM;
				goto out;
			}
1781
			target->service_id = cpu_to_be64(simple_strtoull(p, NULL, 16));
1782
			target->path.service_id = target->service_id;
1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793
			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;

1794 1795 1796 1797 1798 1799 1800 1801
		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;

1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816
		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;

1817 1818
		case SRP_OPT_INITIATOR_EXT:
			p = match_strdup(args);
1819 1820 1821 1822
			if (!p) {
				ret = -ENOMEM;
				goto out;
			}
1823 1824 1825 1826
			target->initiator_ext = cpu_to_be64(simple_strtoull(p, NULL, 16));
			kfree(p);
			break;

1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848
		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;
}

1849 1850
static ssize_t srp_create_target(struct device *dev,
				 struct device_attribute *attr,
1851 1852 1853
				 const char *buf, size_t count)
{
	struct srp_host *host =
1854
		container_of(dev, struct srp_host, dev);
1855 1856 1857 1858 1859 1860 1861 1862 1863 1864
	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;

1865
	target_host->transportt = ib_srp_transport_template;
A
Arne Redlich 已提交
1866 1867
	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
1868

1869 1870
	target = host_to_target(target_host);

1871
	target->io_class   = SRP_REV16A_IB_IO_CLASS;
1872 1873 1874
	target->scsi_host  = target_host;
	target->srp_host   = host;

1875
	INIT_LIST_HEAD(&target->free_reqs);
1876
	INIT_LIST_HEAD(&target->req_queue);
1877 1878 1879 1880
	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);
	}
1881 1882 1883 1884 1885

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

1886 1887
	ib_get_cached_gid(host->srp_dev->dev, host->port, 0,
			  &target->path.sgid);
1888

1889 1890 1891
	shost_printk(KERN_DEBUG, target->scsi_host, PFX
		     "new target: id_ext %016llx ioc_guid %016llx pkey %04x "
		     "service_id %016llx dgid %04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908
	       (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),
	       (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[0]),
	       (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[2]),
	       (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[4]),
	       (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[6]),
	       (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[8]),
	       (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[10]),
	       (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[12]),
	       (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[14]));

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

D
David Dillow 已提交
1909 1910
	ret = srp_new_cm_id(target);
	if (ret)
1911 1912
		goto err_free;

1913
	target->qp_in_error = 0;
1914 1915
	ret = srp_connect_target(target);
	if (ret) {
1916 1917
		shost_printk(KERN_ERR, target->scsi_host,
			     PFX "Connection failed\n");
1918 1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941
		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;
}

1942
static DEVICE_ATTR(add_target, S_IWUSR, NULL, srp_create_target);
1943

1944 1945
static ssize_t show_ibdev(struct device *dev, struct device_attribute *attr,
			  char *buf)
1946
{
1947
	struct srp_host *host = container_of(dev, struct srp_host, dev);
1948

1949
	return sprintf(buf, "%s\n", host->srp_dev->dev->name);
1950 1951
}

1952
static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
1953

1954 1955
static ssize_t show_port(struct device *dev, struct device_attribute *attr,
			 char *buf)
1956
{
1957
	struct srp_host *host = container_of(dev, struct srp_host, dev);
1958 1959 1960 1961

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

1962
static DEVICE_ATTR(port, S_IRUGO, show_port, NULL);
1963

1964
static struct srp_host *srp_add_port(struct srp_device *device, u8 port)
1965 1966 1967 1968 1969 1970 1971 1972
{
	struct srp_host *host;

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

	INIT_LIST_HEAD(&host->target_list);
1973
	spin_lock_init(&host->target_lock);
1974
	init_completion(&host->released);
1975
	host->srp_dev = device;
1976 1977
	host->port = port;

1978 1979 1980
	host->dev.class = &srp_class;
	host->dev.parent = device->dev->dma_device;
	snprintf(host->dev.bus_id, BUS_ID_SIZE, "srp-%s-%d",
1981
		 device->dev->name, port);
1982

1983
	if (device_register(&host->dev))
1984
		goto free_host;
1985
	if (device_create_file(&host->dev, &dev_attr_add_target))
1986
		goto err_class;
1987
	if (device_create_file(&host->dev, &dev_attr_ibdev))
1988
		goto err_class;
1989
	if (device_create_file(&host->dev, &dev_attr_port))
1990 1991 1992 1993 1994
		goto err_class;

	return host;

err_class:
1995
	device_unregister(&host->dev);
1996

1997
free_host:
1998 1999 2000 2001 2002 2003 2004
	kfree(host);

	return NULL;
}

static void srp_add_one(struct ib_device *device)
{
2005 2006 2007
	struct srp_device *srp_dev;
	struct ib_device_attr *dev_attr;
	struct ib_fmr_pool_param fmr_param;
2008 2009 2010
	struct srp_host *host;
	int s, e, p;

2011 2012
	dev_attr = kmalloc(sizeof *dev_attr, GFP_KERNEL);
	if (!dev_attr)
2013
		return;
2014

2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031
	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;
2032
	srp_dev->fmr_page_mask  = ~((u64) srp_dev->fmr_page_size - 1);
2033 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

	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;
2061

T
Tom Tucker 已提交
2062
	if (device->node_type == RDMA_NODE_IB_SWITCH) {
2063 2064 2065 2066 2067 2068 2069 2070
		s = 0;
		e = 0;
	} else {
		s = 1;
		e = device->phys_port_cnt;
	}

	for (p = s; p <= e; ++p) {
2071
		host = srp_add_port(srp_dev, p);
2072
		if (host)
2073
			list_add_tail(&host->list, &srp_dev->dev_list);
2074 2075
	}

2076 2077 2078 2079 2080 2081 2082 2083 2084 2085 2086 2087
	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);
2088 2089 2090 2091
}

static void srp_remove_one(struct ib_device *device)
{
2092
	struct srp_device *srp_dev;
2093 2094 2095 2096
	struct srp_host *host, *tmp_host;
	LIST_HEAD(target_list);
	struct srp_target_port *target, *tmp_target;

2097
	srp_dev = ib_get_client_data(device, &srp_client);
2098

2099
	list_for_each_entry_safe(host, tmp_host, &srp_dev->dev_list, list) {
2100
		device_unregister(&host->dev);
2101 2102 2103 2104 2105 2106 2107 2108 2109 2110
		/*
		 * 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.
		 */
2111
		spin_lock(&host->target_lock);
2112
		list_for_each_entry(target, &host->target_list, list) {
2113 2114 2115
			spin_lock_irq(target->scsi_host->host_lock);
			target->state = SRP_TARGET_REMOVED;
			spin_unlock_irq(target->scsi_host->host_lock);
2116
		}
2117
		spin_unlock(&host->target_lock);
2118 2119 2120 2121 2122 2123 2124 2125 2126 2127

		/*
		 * 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) {
2128
			srp_remove_host(target->scsi_host);
2129
			scsi_remove_host(target->scsi_host);
2130 2131 2132 2133 2134 2135 2136 2137 2138
			srp_disconnect_target(target);
			ib_destroy_cm_id(target->cm_id);
			srp_free_target_ib(target);
			scsi_host_put(target->scsi_host);
		}

		kfree(host);
	}

2139 2140 2141 2142 2143 2144
	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);
2145 2146
}

2147 2148 2149
static struct srp_function_template ib_srp_transport_functions = {
};

2150 2151 2152 2153
static int __init srp_init_module(void)
{
	int ret;

2154 2155 2156 2157 2158
	if (srp_sg_tablesize > 255) {
		printk(KERN_WARNING PFX "Clamping srp_sg_tablesize to 255\n");
		srp_sg_tablesize = 255;
	}

2159 2160 2161 2162 2163
	ib_srp_transport_template =
		srp_attach_transport(&ib_srp_transport_functions);
	if (!ib_srp_transport_template)
		return -ENOMEM;

2164 2165 2166 2167 2168
	srp_template.sg_tablesize = srp_sg_tablesize;
	srp_max_iu_len = (sizeof (struct srp_cmd) +
			  sizeof (struct srp_indirect_buf) +
			  srp_sg_tablesize * 16);

2169 2170 2171
	ret = class_register(&srp_class);
	if (ret) {
		printk(KERN_ERR PFX "couldn't register class infiniband_srp\n");
2172
		srp_release_transport(ib_srp_transport_template);
2173 2174 2175
		return ret;
	}

2176 2177
	ib_sa_register_client(&srp_sa_client);

2178 2179 2180
	ret = ib_register_client(&srp_client);
	if (ret) {
		printk(KERN_ERR PFX "couldn't register IB client\n");
2181
		srp_release_transport(ib_srp_transport_template);
2182
		ib_sa_unregister_client(&srp_sa_client);
2183 2184 2185 2186 2187 2188 2189 2190 2191 2192
		class_unregister(&srp_class);
		return ret;
	}

	return 0;
}

static void __exit srp_cleanup_module(void)
{
	ib_unregister_client(&srp_client);
2193
	ib_sa_unregister_client(&srp_sa_client);
2194
	class_unregister(&srp_class);
2195
	srp_release_transport(ib_srp_transport_template);
2196 2197 2198 2199
}

module_init(srp_init_module);
module_exit(srp_cleanup_module);