ib_srp.c 53.6 KB
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/*
 * Copyright (c) 2005 Cisco Systems.  All rights reserved.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * OpenIB.org BSD license below:
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *      - Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer.
 *
 *      - Redistributions in binary form must reproduce the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer in the documentation and/or other materials
 *        provided with the distribution.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 *
 * $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,
		 "Max number of gather/scatter entries per I/O (default is 12)");

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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->dev->dev, iu->buf, size, direction);
	if (ib_dma_mapping_error(host->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->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->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;
}

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->dev->dev, srp_completion,
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				  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->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)
		printk(KERN_ERR PFX "Got failed path rec status %d\n", status);
	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,
						   target->srp_host->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)
		printk(KERN_WARNING PFX "Path record query failed\n");

	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.
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	 */
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	if (srp_target_is_topspin(target)) {
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		printk(KERN_DEBUG PFX "Topspin/Cisco initiator port ID workaround "
		       "activated for target GUID %016llx\n",
		       (unsigned long long) be64_to_cpu(target->ioc_guid));
		memset(req->priv.initiator_port_id, 0, 8);
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		memcpy(req->priv.initiator_port_id + 8,
		       &target->srp_host->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)) {
		printk(KERN_DEBUG PFX "Sending CM DREQ failed\n");
		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)
{
	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;

		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->dev->dev, scsi_sglist(scmnd),
			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_cm_id *new_cm_id;
	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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	new_cm_id = ib_create_cm_id(target->srp_host->dev->dev,
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				    srp_cm_handler, target);
	if (IS_ERR(new_cm_id)) {
		ret = PTR_ERR(new_cm_id);
		goto err;
	}
	ib_destroy_cm_id(target->cm_id);
	target->cm_id = new_cm_id;

	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:
	printk(KERN_ERR PFX "reconnect failed (%d), removing target port.\n", ret);

	/*
	 * 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;
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	struct srp_device *dev = target->srp_host->dev;
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	struct ib_device *ibdev = dev->dev;
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	struct scatterlist *sg;
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	if (!dev->fmr_pool)
		return -ENODEV;

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

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	len = page_cnt = 0;
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	scsi_for_each_sg(req->scmnd, sg, sg_cnt, i) {
		unsigned int dma_len = ib_sg_dma_len(ibdev, sg);
614

615
		if (ib_sg_dma_address(ibdev, sg) & ~dev->fmr_page_mask) {
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			if (i > 0)
				return -EINVAL;
			else
				++page_cnt;
		}
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		if ((ib_sg_dma_address(ibdev, sg) + dma_len) &
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		    ~dev->fmr_page_mask) {
			if (i < sg_cnt - 1)
				return -EINVAL;
			else
				++page_cnt;
		}

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		len += dma_len;
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	}

	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;
641 642
	scsi_for_each_sg(req->scmnd, sg, sg_cnt, i) {
		unsigned int dma_len = ib_sg_dma_len(ibdev, sg);
643 644

		for (j = 0; j < dma_len; j += dev->fmr_page_size)
645
			dma_pages[page_cnt++] =
646
				(ib_sg_dma_address(ibdev, sg) &
647 648
				 dev->fmr_page_mask) + j;
	}
649 650

	req->fmr = ib_fmr_pool_map_phys(dev->fmr_pool,
651
					dma_pages, page_cnt, io_addr);
652 653
	if (IS_ERR(req->fmr)) {
		ret = PTR_ERR(req->fmr);
V
Vu Pham 已提交
654
		req->fmr = NULL;
655 656 657
		goto out;
	}

658 659
	buf->va  = cpu_to_be64(ib_sg_dma_address(ibdev, &scat[0]) &
			       ~dev->fmr_page_mask);
660 661 662 663 664 665 666 667 668 669 670
	buf->key = cpu_to_be32(req->fmr->fmr->rkey);
	buf->len = cpu_to_be32(len);

	ret = 0;

out:
	kfree(dma_pages);

	return ret;
}

671 672 673
static int srp_map_data(struct scsi_cmnd *scmnd, struct srp_target_port *target,
			struct srp_request *req)
{
674
	struct scatterlist *scat;
675
	struct srp_cmd *cmd = req->cmd->buf;
676
	int len, nents, count;
677
	u8 fmt = SRP_DATA_DESC_DIRECT;
678 679
	struct srp_device *dev;
	struct ib_device *ibdev;
680

681
	if (!scsi_sglist(scmnd) || scmnd->sc_data_direction == DMA_NONE)
682 683 684 685 686 687 688 689 690
		return sizeof (struct srp_cmd);

	if (scmnd->sc_data_direction != DMA_FROM_DEVICE &&
	    scmnd->sc_data_direction != DMA_TO_DEVICE) {
		printk(KERN_WARNING PFX "Unhandled data direction %d\n",
		       scmnd->sc_data_direction);
		return -EINVAL;
	}

691 692
	nents = scsi_sg_count(scmnd);
	scat  = scsi_sglist(scmnd);
693

694 695 696 697
	dev = target->srp_host->dev;
	ibdev = dev->dev;

	count = ib_dma_map_sg(ibdev, scat, nents, scmnd->sc_data_direction);
698 699 700

	fmt = SRP_DATA_DESC_DIRECT;
	len = sizeof (struct srp_cmd) +	sizeof (struct srp_direct_buf);
701

702
	if (count == 1) {
703 704 705 706 707 708
		/*
		 * 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.
		 */
709
		struct srp_direct_buf *buf = (void *) cmd->add_data;
710

711 712 713
		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));
714
	} else if (srp_map_fmr(target, scat, count, req,
715 716 717 718 719 720
			       (void *) cmd->add_data)) {
		/*
		 * FMR mapping failed, and the scatterlist has more
		 * than one entry.  Generate an indirect memory
		 * descriptor.
		 */
721
		struct srp_indirect_buf *buf = (void *) cmd->add_data;
722
		struct scatterlist *sg;
723
		u32 datalen = 0;
724
		int i;
725

726
		fmt = SRP_DATA_DESC_INDIRECT;
727 728 729 730
		len = sizeof (struct srp_cmd) +
			sizeof (struct srp_indirect_buf) +
			count * sizeof (struct srp_direct_buf);

731 732
		scsi_for_each_sg(scmnd, sg, count, i) {
			unsigned int dma_len = ib_sg_dma_len(ibdev, sg);
733

734
			buf->desc_list[i].va  =
735
				cpu_to_be64(ib_sg_dma_address(ibdev, sg));
736
			buf->desc_list[i].key =
737 738 739
				cpu_to_be32(dev->mr->rkey);
			buf->desc_list[i].len = cpu_to_be32(dma_len);
			datalen += dma_len;
740
		}
741

742 743 744 745 746
		if (scmnd->sc_data_direction == DMA_TO_DEVICE)
			cmd->data_out_desc_cnt = count;
		else
			cmd->data_in_desc_cnt = count;

747 748
		buf->table_desc.va  =
			cpu_to_be64(req->cmd->dma + sizeof *cmd + sizeof *buf);
749
		buf->table_desc.key =
750
			cpu_to_be32(target->srp_host->dev->mr->rkey);
751 752 753 754
		buf->table_desc.len =
			cpu_to_be32(count * sizeof (struct srp_direct_buf));

		buf->len = cpu_to_be32(datalen);
755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786
	}

	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 {
787
		scmnd = req->scmnd;
788 789 790 791 792 793 794 795 796 797 798 799 800
		if (!scmnd)
			printk(KERN_ERR "Null scmnd for RSP w/tag %016llx\n",
			       (unsigned long long) rsp->tag);
		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))
801
			scsi_set_resid(scmnd, be32_to_cpu(rsp->data_out_res_cnt));
802
		else if (rsp->flags & (SRP_RSP_FLAG_DIOVER | SRP_RSP_FLAG_DIUNDER))
803
			scsi_set_resid(scmnd, be32_to_cpu(rsp->data_in_res_cnt));
804 805 806 807 808

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

809
			srp_remove_req(target, req);
810 811 812 813 814 815 816 817 818
		} 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)
{
819
	struct ib_device *dev;
820 821 822 823 824
	struct srp_iu *iu;
	u8 opcode;

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

825 826 827
	dev = target->srp_host->dev->dev;
	ib_dma_sync_single_for_cpu(dev, iu->dma, target->max_ti_iu_len,
				   DMA_FROM_DEVICE);
828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862

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

	if (0) {
		int i;

		printk(KERN_ERR PFX "recv completion, opcode 0x%02x\n", opcode);

		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 */
		printk(KERN_WARNING PFX "Got target logout request\n");
		break;

	default:
		printk(KERN_WARNING PFX "Unhandled SRP opcode 0x%02x\n", opcode);
		break;
	}

863 864
	ib_dma_sync_single_for_device(dev, iu->dma, target->max_ti_iu_len,
				      DMA_FROM_DEVICE);
865 866 867 868 869 870 871 872 873 874 875 876 877
}

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) {
			printk(KERN_ERR PFX "failed %s status %d\n",
			       wc.wr_id & SRP_OP_RECV ? "receive" : "send",
			       wc.status);
878
			target->qp_in_error = 1;
879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902
			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;
903
	list.lkey   = target->srp_host->dev->mr->lkey;
904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929

	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
930 931
 * req_lim and tx_head.  Lock cannot be dropped between call here and
 * call to __srp_post_send().
932
 */
933 934
static struct srp_iu *__srp_get_tx_iu(struct srp_target_port *target,
					enum srp_request_type req_type)
935
{
936 937
	s32 min = (req_type == SRP_REQ_TASK_MGMT) ? 1 : 2;

938 939 940
	if (target->tx_head - target->tx_tail >= SRP_SQ_SIZE)
		return NULL;

941
	if (target->req_lim < min) {
942
		++target->zero_req_lim;
943 944
		return NULL;
	}
945

946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961
	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;
962
	list.lkey   = target->srp_host->dev->mr->lkey;
963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987

	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;
988
	struct ib_device *dev;
989 990 991 992 993 994 995 996 997 998 999 1000
	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;
	}

1001
	iu = __srp_get_tx_iu(target, SRP_REQ_NORMAL);
1002 1003 1004
	if (!iu)
		goto err;

1005 1006 1007
	dev = target->srp_host->dev->dev;
	ib_dma_sync_single_for_cpu(dev, iu->dma, srp_max_iu_len,
				   DMA_TO_DEVICE);
1008

1009
	req = list_entry(target->free_reqs.next, struct srp_request, list);
1010 1011 1012

	scmnd->scsi_done     = done;
	scmnd->result        = 0;
1013
	scmnd->host_scribble = (void *) (long) req->index;
1014 1015 1016 1017 1018 1019

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

	cmd->opcode = SRP_CMD;
	cmd->lun    = cpu_to_be64((u64) scmnd->device->lun << 48);
1020
	cmd->tag    = req->index;
1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038
	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) {
		printk(KERN_ERR PFX "Failed to map data\n");
		goto err;
	}

	if (__srp_post_recv(target)) {
		printk(KERN_ERR PFX "Recv failed\n");
		goto err_unmap;
	}

1039 1040
	ib_dma_sync_single_for_device(dev, iu->dma, srp_max_iu_len,
				      DMA_TO_DEVICE);
1041 1042 1043 1044 1045 1046

	if (__srp_post_send(target, iu, len)) {
		printk(KERN_ERR PFX "Send failed\n");
		goto err_unmap;
	}

1047
	list_move_tail(&req->list, &target->req_queue);
1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071

	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,
1072
						  srp_max_iu_len,
1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113
						  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)
{
	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:
1114
		if (srp_target_is_topspin(target)) {
1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 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 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196
			/*
			 * 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);

			printk(KERN_DEBUG 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));

			target->status = SRP_PORT_REDIRECT;
		} else {
			printk(KERN_WARNING "  REJ reason: IB_CM_REJ_PORT_REDIRECT\n");
			target->status = -ECONNRESET;
		}
		break;

	case IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID:
		printk(KERN_WARNING "  REJ reason: IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID\n");
		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)
				printk(KERN_WARNING PFX
				       "SRP_LOGIN_REJ: requested max_it_iu_len too large\n");
			else
				printk(KERN_WARNING PFX
				       "SRP LOGIN REJECTED, reason 0x%08x\n", reason);
		} else
			printk(KERN_WARNING "  REJ reason: IB_CM_REJ_CONSUMER_DEFINED,"
			       " opcode 0x%02x\n", opcode);
		target->status = -ECONNRESET;
		break;

	default:
		printk(KERN_WARNING "  REJ reason 0x%x\n",
		       event->param.rej_rcvd.reason);
		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:
		printk(KERN_DEBUG PFX "Sending CM REQ failed\n");
		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 {
			printk(KERN_WARNING PFX "Unhandled RSP opcode %#x\n", opcode);
			target->status = -ECONNRESET;
			break;
		}

V
Vu Pham 已提交
1197 1198 1199 1200 1201
		if (!target->rx_ring[0]) {
			target->status = srp_alloc_iu_bufs(target);
			if (target->status)
				break;
		}
1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243

		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:
		printk(KERN_DEBUG PFX "REJ received\n");
		comp = 1;

		srp_cm_rej_handler(cm_id, event, target);
		break;

1244 1245 1246 1247
	case IB_CM_DREQ_RECEIVED:
		printk(KERN_WARNING PFX "DREQ received - connection closed\n");
		if (ib_send_cm_drep(cm_id, NULL, 0))
			printk(KERN_ERR PFX "Sending CM DREP failed\n");
1248 1249 1250 1251 1252 1253 1254 1255 1256
		break;

	case IB_CM_TIMEWAIT_EXIT:
		printk(KERN_ERR PFX "connection closed\n");

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

1257 1258 1259 1260 1261
	case IB_CM_MRA_RECEIVED:
	case IB_CM_DREQ_ERROR:
	case IB_CM_DREP_RECEIVED:
		break;

1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274
	default:
		printk(KERN_WARNING PFX "Unhandled CM event %d\n", event->event);
		break;
	}

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

	kfree(qp_attr);

	return 0;
}

1275 1276
static int srp_send_tsk_mgmt(struct srp_target_port *target,
			     struct srp_request *req, u8 func)
1277 1278 1279 1280 1281 1282
{
	struct srp_iu *iu;
	struct srp_tsk_mgmt *tsk_mgmt;

	spin_lock_irq(target->scsi_host->host_lock);

1283 1284
	if (target->state == SRP_TARGET_DEAD ||
	    target->state == SRP_TARGET_REMOVED) {
1285
		req->scmnd->result = DID_BAD_TARGET << 16;
1286 1287 1288
		goto out;
	}

1289 1290
	init_completion(&req->done);

1291
	iu = __srp_get_tx_iu(target, SRP_REQ_TASK_MGMT);
1292 1293 1294 1295 1296 1297 1298
	if (!iu)
		goto out;

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

	tsk_mgmt->opcode 	= SRP_TSK_MGMT;
1299 1300
	tsk_mgmt->lun 		= cpu_to_be64((u64) req->scmnd->device->lun << 48);
	tsk_mgmt->tag 		= req->index | SRP_TAG_TSK_MGMT;
1301
	tsk_mgmt->tsk_mgmt_func = func;
1302
	tsk_mgmt->task_tag 	= req->index;
1303 1304 1305 1306 1307 1308 1309

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

	req->tsk_mgmt = iu;

	spin_unlock_irq(target->scsi_host->host_lock);
1310

1311 1312
	if (!wait_for_completion_timeout(&req->done,
					 msecs_to_jiffies(SRP_ABORT_TIMEOUT_MS)))
1313
		return -1;
1314

1315
	return 0;
1316 1317 1318

out:
	spin_unlock_irq(target->scsi_host->host_lock);
1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331
	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;
1332 1333 1334 1335
}

static int srp_abort(struct scsi_cmnd *scmnd)
{
1336 1337 1338 1339
	struct srp_target_port *target = host_to_target(scmnd->device->host);
	struct srp_request *req;
	int ret = SUCCESS;

1340 1341
	printk(KERN_ERR "SRP abort called\n");

1342 1343
	if (target->qp_in_error)
		return FAILED;
1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362
	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;
1363 1364 1365 1366
}

static int srp_reset_device(struct scsi_cmnd *scmnd)
{
1367 1368 1369
	struct srp_target_port *target = host_to_target(scmnd->device->host);
	struct srp_request *req, *tmp;

1370 1371
	printk(KERN_ERR "SRP reset_device called\n");

1372 1373
	if (target->qp_in_error)
		return FAILED;
1374 1375 1376 1377 1378 1379 1380 1381 1382 1383
	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)
1384 1385
		if (req->scmnd->device == scmnd->device)
			srp_reset_req(target, req);
1386 1387 1388 1389

	spin_unlock_irq(target->scsi_host->host_lock);

	return SUCCESS;
1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404
}

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

	printk(KERN_ERR PFX "SRP reset_host called\n");

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

	return ret;
}

1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470
static ssize_t show_id_ext(struct class_device *cdev, char *buf)
{
	struct srp_target_port *target = host_to_target(class_to_shost(cdev));

	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));
}

static ssize_t show_ioc_guid(struct class_device *cdev, char *buf)
{
	struct srp_target_port *target = host_to_target(class_to_shost(cdev));

	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));
}

static ssize_t show_service_id(struct class_device *cdev, char *buf)
{
	struct srp_target_port *target = host_to_target(class_to_shost(cdev));

	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));
}

static ssize_t show_pkey(struct class_device *cdev, char *buf)
{
	struct srp_target_port *target = host_to_target(class_to_shost(cdev));

	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));
}

static ssize_t show_dgid(struct class_device *cdev, char *buf)
{
	struct srp_target_port *target = host_to_target(class_to_shost(cdev));

	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]));
}

1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489
static ssize_t show_orig_dgid(struct class_device *cdev, char *buf)
{
	struct srp_target_port *target = host_to_target(class_to_shost(cdev));

	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]));
}

1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500
static ssize_t show_zero_req_lim(struct class_device *cdev, char *buf)
{
	struct srp_target_port *target = host_to_target(class_to_shost(cdev));

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

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

1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519
static ssize_t show_local_ib_port(struct class_device *cdev, char *buf)
{
	struct srp_target_port *target = host_to_target(class_to_shost(cdev));

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

static ssize_t show_local_ib_device(struct class_device *cdev, char *buf)
{
	struct srp_target_port *target = host_to_target(class_to_shost(cdev));

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

static CLASS_DEVICE_ATTR(id_ext,	  S_IRUGO, show_id_ext,		 NULL);
static CLASS_DEVICE_ATTR(ioc_guid,	  S_IRUGO, show_ioc_guid,	 NULL);
static CLASS_DEVICE_ATTR(service_id,	  S_IRUGO, show_service_id,	 NULL);
static CLASS_DEVICE_ATTR(pkey,		  S_IRUGO, show_pkey,		 NULL);
static CLASS_DEVICE_ATTR(dgid,		  S_IRUGO, show_dgid,		 NULL);
1520
static CLASS_DEVICE_ATTR(orig_dgid,	  S_IRUGO, show_orig_dgid,	 NULL);
1521 1522 1523
static CLASS_DEVICE_ATTR(zero_req_lim,	  S_IRUGO, show_zero_req_lim,	 NULL);
static CLASS_DEVICE_ATTR(local_ib_port,   S_IRUGO, show_local_ib_port,	 NULL);
static CLASS_DEVICE_ATTR(local_ib_device, S_IRUGO, show_local_ib_device, NULL);
1524 1525 1526 1527 1528 1529 1530

static struct class_device_attribute *srp_host_attrs[] = {
	&class_device_attr_id_ext,
	&class_device_attr_ioc_guid,
	&class_device_attr_service_id,
	&class_device_attr_pkey,
	&class_device_attr_dgid,
1531
	&class_device_attr_orig_dgid,
1532
	&class_device_attr_zero_req_lim,
1533 1534
	&class_device_attr_local_ib_port,
	&class_device_attr_local_ib_device,
1535 1536 1537
	NULL
};

1538 1539
static struct scsi_host_template srp_template = {
	.module				= THIS_MODULE,
R
Roland Dreier 已提交
1540 1541
	.name				= "InfiniBand SRP initiator",
	.proc_name			= DRV_NAME,
1542 1543 1544 1545 1546 1547 1548 1549
	.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,
1550
	.use_clustering			= ENABLE_CLUSTERING,
D
David Dillow 已提交
1551
	.use_sg_chaining		= ENABLE_SG_CHAINING,
1552
	.shost_attrs			= srp_host_attrs
1553 1554 1555 1556
};

static int srp_add_target(struct srp_host *host, struct srp_target_port *target)
{
1557 1558 1559
	struct srp_rport_identifiers ids;
	struct srp_rport *rport;

1560 1561 1562
	sprintf(target->target_name, "SRP.T10:%016llX",
		 (unsigned long long) be64_to_cpu(target->id_ext));

1563
	if (scsi_add_host(target->scsi_host, host->dev->dev->dma_device))
1564 1565
		return -ENODEV;

1566 1567
	memcpy(ids.port_id, &target->id_ext, 8);
	memcpy(ids.port_id + 8, &target->ioc_guid, 8);
1568
	ids.roles = SRP_RPORT_ROLE_TARGET;
1569 1570 1571 1572 1573 1574
	rport = srp_rport_add(target->scsi_host, &ids);
	if (IS_ERR(rport)) {
		scsi_remove_host(target->scsi_host);
		return PTR_ERR(rport);
	}

1575
	spin_lock(&host->target_lock);
1576
	list_add_tail(&target->list, &host->target_list);
1577
	spin_unlock(&host->target_lock);
1578 1579 1580 1581

	target->state = SRP_TARGET_LIVE;

	scsi_scan_target(&target->scsi_host->shost_gendev,
1582
			 0, target->scsi_id, SCAN_WILD_CARD, 0);
1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615

	return 0;
}

static void srp_release_class_dev(struct class_device *class_dev)
{
	struct srp_host *host =
		container_of(class_dev, struct srp_host, class_dev);

	complete(&host->released);
}

static struct class srp_class = {
	.name    = "infiniband_srp",
	.release = srp_release_class_dev
};

/*
 * 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,
1616
	SRP_OPT_MAX_CMD_PER_LUN	= 1 << 6,
1617
	SRP_OPT_IO_CLASS	= 1 << 7,
1618
	SRP_OPT_INITIATOR_EXT	= 1 << 8,
1619 1620 1621 1622 1623 1624 1625 1626
	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 = {
1627 1628 1629 1630 1631 1632 1633
	{ 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" 	},
1634
	{ SRP_OPT_IO_CLASS,		"io_class=%x"		},
1635
	{ SRP_OPT_INITIATOR_EXT,	"initiator_ext=%s"	},
1636
	{ SRP_OPT_ERR,			NULL 			}
1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664
};

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);
1665 1666 1667 1668
			if (!p) {
				ret = -ENOMEM;
				goto out;
			}
1669 1670 1671 1672 1673 1674
			target->id_ext = cpu_to_be64(simple_strtoull(p, NULL, 16));
			kfree(p);
			break;

		case SRP_OPT_IOC_GUID:
			p = match_strdup(args);
1675 1676 1677 1678
			if (!p) {
				ret = -ENOMEM;
				goto out;
			}
1679 1680 1681 1682 1683 1684
			target->ioc_guid = cpu_to_be64(simple_strtoull(p, NULL, 16));
			kfree(p);
			break;

		case SRP_OPT_DGID:
			p = match_strdup(args);
1685 1686 1687 1688
			if (!p) {
				ret = -ENOMEM;
				goto out;
			}
1689 1690
			if (strlen(p) != 32) {
				printk(KERN_WARNING PFX "bad dest GID parameter '%s'\n", p);
1691
				kfree(p);
1692 1693 1694 1695 1696 1697 1698
				goto out;
			}

			for (i = 0; i < 16; ++i) {
				strlcpy(dgid, p + i * 2, 3);
				target->path.dgid.raw[i] = simple_strtoul(dgid, NULL, 16);
			}
1699
			kfree(p);
1700
			memcpy(target->orig_dgid, target->path.dgid.raw, 16);
1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712
			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);
1713 1714 1715 1716
			if (!p) {
				ret = -ENOMEM;
				goto out;
			}
1717
			target->service_id = cpu_to_be64(simple_strtoull(p, NULL, 16));
1718
			target->path.service_id = target->service_id;
1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729
			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;

1730 1731 1732 1733 1734 1735 1736 1737
		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;

1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752
		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;

1753 1754
		case SRP_OPT_INITIATOR_EXT:
			p = match_strdup(args);
1755 1756 1757 1758
			if (!p) {
				ret = -ENOMEM;
				goto out;
			}
1759 1760 1761 1762
			target->initiator_ext = cpu_to_be64(simple_strtoull(p, NULL, 16));
			kfree(p);
			break;

1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799
		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;
}

static ssize_t srp_create_target(struct class_device *class_dev,
				 const char *buf, size_t count)
{
	struct srp_host *host =
		container_of(class_dev, struct srp_host, class_dev);
	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;

1800
	target_host->transportt = ib_srp_transport_template;
A
Arne Redlich 已提交
1801 1802
	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
1803

1804 1805
	target = host_to_target(target_host);

1806
	target->io_class   = SRP_REV16A_IB_IO_CLASS;
1807 1808 1809
	target->scsi_host  = target_host;
	target->srp_host   = host;

1810
	INIT_LIST_HEAD(&target->free_reqs);
1811
	INIT_LIST_HEAD(&target->req_queue);
1812 1813 1814 1815
	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);
	}
1816 1817 1818 1819 1820

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

1821
	ib_get_cached_gid(host->dev->dev, host->port, 0, &target->path.sgid);
1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841

	printk(KERN_DEBUG PFX "new target: id_ext %016llx ioc_guid %016llx pkey %04x "
	       "service_id %016llx dgid %04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
	       (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;

1842
	target->cm_id = ib_create_cm_id(host->dev->dev, srp_cm_handler, target);
1843 1844 1845 1846 1847
	if (IS_ERR(target->cm_id)) {
		ret = PTR_ERR(target->cm_id);
		goto err_free;
	}

1848
	target->qp_in_error = 0;
1849 1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879 1880 1881 1882
	ret = srp_connect_target(target);
	if (ret) {
		printk(KERN_ERR PFX "Connection failed\n");
		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;
}

static CLASS_DEVICE_ATTR(add_target, S_IWUSR, NULL, srp_create_target);

static ssize_t show_ibdev(struct class_device *class_dev, char *buf)
{
	struct srp_host *host =
		container_of(class_dev, struct srp_host, class_dev);

1883
	return sprintf(buf, "%s\n", host->dev->dev->name);
1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897
}

static CLASS_DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);

static ssize_t show_port(struct class_device *class_dev, char *buf)
{
	struct srp_host *host =
		container_of(class_dev, struct srp_host, class_dev);

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

static CLASS_DEVICE_ATTR(port, S_IRUGO, show_port, NULL);

1898
static struct srp_host *srp_add_port(struct srp_device *device, u8 port)
1899 1900 1901 1902 1903 1904 1905 1906
{
	struct srp_host *host;

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

	INIT_LIST_HEAD(&host->target_list);
1907
	spin_lock_init(&host->target_lock);
1908 1909 1910 1911 1912
	init_completion(&host->released);
	host->dev  = device;
	host->port = port;

	host->class_dev.class = &srp_class;
1913
	host->class_dev.dev   = device->dev->dma_device;
1914
	snprintf(host->class_dev.class_id, BUS_ID_SIZE, "srp-%s-%d",
1915
		 device->dev->name, port);
1916 1917

	if (class_device_register(&host->class_dev))
1918
		goto free_host;
1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929 1930
	if (class_device_create_file(&host->class_dev, &class_device_attr_add_target))
		goto err_class;
	if (class_device_create_file(&host->class_dev, &class_device_attr_ibdev))
		goto err_class;
	if (class_device_create_file(&host->class_dev, &class_device_attr_port))
		goto err_class;

	return host;

err_class:
	class_device_unregister(&host->class_dev);

1931
free_host:
1932 1933 1934 1935 1936 1937 1938
	kfree(host);

	return NULL;
}

static void srp_add_one(struct ib_device *device)
{
1939 1940 1941
	struct srp_device *srp_dev;
	struct ib_device_attr *dev_attr;
	struct ib_fmr_pool_param fmr_param;
1942 1943 1944
	struct srp_host *host;
	int s, e, p;

1945 1946
	dev_attr = kmalloc(sizeof *dev_attr, GFP_KERNEL);
	if (!dev_attr)
1947
		return;
1948

1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965
	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;
1966
	srp_dev->fmr_page_mask  = ~((u64) srp_dev->fmr_page_size - 1);
1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994

	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;
1995

T
Tom Tucker 已提交
1996
	if (device->node_type == RDMA_NODE_IB_SWITCH) {
1997 1998 1999 2000 2001 2002 2003 2004
		s = 0;
		e = 0;
	} else {
		s = 1;
		e = device->phys_port_cnt;
	}

	for (p = s; p <= e; ++p) {
2005
		host = srp_add_port(srp_dev, p);
2006
		if (host)
2007
			list_add_tail(&host->list, &srp_dev->dev_list);
2008 2009
	}

2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021
	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);
2022 2023 2024 2025
}

static void srp_remove_one(struct ib_device *device)
{
2026
	struct srp_device *srp_dev;
2027 2028 2029 2030
	struct srp_host *host, *tmp_host;
	LIST_HEAD(target_list);
	struct srp_target_port *target, *tmp_target;

2031
	srp_dev = ib_get_client_data(device, &srp_client);
2032

2033
	list_for_each_entry_safe(host, tmp_host, &srp_dev->dev_list, list) {
2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044
		class_device_unregister(&host->class_dev);
		/*
		 * 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.
		 */
2045
		spin_lock(&host->target_lock);
2046
		list_for_each_entry(target, &host->target_list, list) {
2047 2048 2049
			spin_lock_irq(target->scsi_host->host_lock);
			target->state = SRP_TARGET_REMOVED;
			spin_unlock_irq(target->scsi_host->host_lock);
2050
		}
2051
		spin_unlock(&host->target_lock);
2052 2053 2054 2055 2056 2057 2058 2059 2060 2061

		/*
		 * 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) {
2062
			srp_remove_host(target->scsi_host);
2063
			scsi_remove_host(target->scsi_host);
2064 2065 2066 2067 2068 2069 2070 2071 2072
			srp_disconnect_target(target);
			ib_destroy_cm_id(target->cm_id);
			srp_free_target_ib(target);
			scsi_host_put(target->scsi_host);
		}

		kfree(host);
	}

2073 2074 2075 2076 2077 2078
	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);
2079 2080
}

2081 2082 2083
static struct srp_function_template ib_srp_transport_functions = {
};

2084 2085 2086 2087
static int __init srp_init_module(void)
{
	int ret;

2088 2089 2090 2091 2092
	ib_srp_transport_template =
		srp_attach_transport(&ib_srp_transport_functions);
	if (!ib_srp_transport_template)
		return -ENOMEM;

2093 2094 2095 2096 2097
	srp_template.sg_tablesize = srp_sg_tablesize;
	srp_max_iu_len = (sizeof (struct srp_cmd) +
			  sizeof (struct srp_indirect_buf) +
			  srp_sg_tablesize * 16);

2098 2099 2100
	ret = class_register(&srp_class);
	if (ret) {
		printk(KERN_ERR PFX "couldn't register class infiniband_srp\n");
2101
		srp_release_transport(ib_srp_transport_template);
2102 2103 2104
		return ret;
	}

2105 2106
	ib_sa_register_client(&srp_sa_client);

2107 2108 2109
	ret = ib_register_client(&srp_client);
	if (ret) {
		printk(KERN_ERR PFX "couldn't register IB client\n");
2110
		srp_release_transport(ib_srp_transport_template);
2111
		ib_sa_unregister_client(&srp_sa_client);
2112 2113 2114 2115 2116 2117 2118 2119 2120 2121
		class_unregister(&srp_class);
		return ret;
	}

	return 0;
}

static void __exit srp_cleanup_module(void)
{
	ib_unregister_client(&srp_client);
2122
	ib_sa_unregister_client(&srp_sa_client);
2123
	class_unregister(&srp_class);
2124
	srp_release_transport(ib_srp_transport_template);
2125 2126 2127 2128
}

module_init(srp_init_module);
module_exit(srp_cleanup_module);