ib_srp.c 44.3 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>

#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");

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");

static const u8 topspin_oui[3] = { 0x00, 0x05, 0xad };

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);

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

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;
}

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;

	iu->dma = dma_map_single(host->dev->dma_device, iu->buf, size, direction);
	if (dma_mapping_error(iu->dma))
		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;

	dma_unmap_single(host->dev->dma_device, iu->dma, iu->size, iu->direction);
	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;

	ret = ib_find_cached_pkey(target->srp_host->dev,
				  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;

	target->cq = ib_create_cq(target->srp_host->dev, srp_completion,
				  NULL, target, SRP_CQ_SIZE);
	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;

	target->qp = ib_create_qp(target->srp_host->pd, init_attr);
	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);

	target->path_query_id = ib_sa_path_rec_get(target->srp_host->dev,
						   target->srp_host->port,
						   &target->path,
						   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;
	req->priv.req_it_iu_len = cpu_to_be32(SRP_MAX_IU_LEN);
	req->priv.req_buf_fmt 	= cpu_to_be16(SRP_BUF_FORMAT_DIRECT |
					      SRP_BUF_FORMAT_INDIRECT);
	memcpy(req->priv.initiator_port_id, target->srp_host->initiator_port_id, 16);
	/*
	 * Topspin/Cisco SRP targets will reject our login unless we
	 * zero out the first 8 bytes of our initiator port ID.  The
	 * second 8 bytes must be our local node GUID, but we always
	 * use that anyway.
	 */
	if (topspin_workarounds && !memcmp(&target->ioc_guid, topspin_oui, 3)) {
		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);
	}
	memcpy(req->priv.target_port_id,     &target->id_ext, 8);
	memcpy(req->priv.target_port_id + 8, &target->ioc_guid, 8);

	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);
}

static void srp_remove_work(void *target_ptr)
{
	struct srp_target_port *target = target_ptr;

	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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	mutex_lock(&target->srp_host->target_mutex);
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	list_del(&target->list);
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	mutex_unlock(&target->srp_host->target_mutex);
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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)
{
	struct scatterlist *scat;
	int nents;

	if (!scmnd->request_buffer ||
	    (scmnd->sc_data_direction != DMA_TO_DEVICE &&
	     scmnd->sc_data_direction != DMA_FROM_DEVICE))
		return;

	/*
	 * This handling of non-SG commands can be killed when the
	 * SCSI midlayer no longer generates non-SG commands.
	 */
	if (likely(scmnd->use_sg)) {
		nents = scmnd->use_sg;
		scat  = scmnd->request_buffer;
	} else {
		nents = 1;
		scat  = &req->fake_sg;
	}

	dma_unmap_sg(target->srp_host->dev->dma_device, scat, nents,
		     scmnd->sc_data_direction);
}

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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;
	struct srp_request *req;
	struct ib_wc wc;
	int ret;
	int i;

	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.
	 */
	new_cm_id = ib_create_cm_id(target->srp_host->dev,
				    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 */

	list_for_each_entry(req, &target->req_queue, list) {
		req->scmnd->result = DID_RESET << 16;
		req->scmnd->scsi_done(req->scmnd);
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		srp_unmap_data(req->scmnd, target, req);
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	}

	target->rx_head	 = 0;
	target->tx_head	 = 0;
	target->tx_tail  = 0;
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	INIT_LIST_HEAD(&target->free_reqs);
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	INIT_LIST_HEAD(&target->req_queue);
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	for (i = 0; i < SRP_SQ_SIZE; ++i)
		list_add_tail(&target->req_ring[i].list, &target->free_reqs);
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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;
		INIT_WORK(&target->work, srp_remove_work, target);
		schedule_work(&target->work);
	}
	spin_unlock_irq(target->scsi_host->host_lock);

	return ret;
}

static int srp_map_data(struct scsi_cmnd *scmnd, struct srp_target_port *target,
			struct srp_request *req)
{
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	struct scatterlist *scat;
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	struct srp_cmd *cmd = req->cmd->buf;
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	int len, nents, count;
	int i;
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	u8 fmt;

	if (!scmnd->request_buffer || scmnd->sc_data_direction == DMA_NONE)
		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;
	}

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	/*
	 * This handling of non-SG commands can be killed when the
	 * SCSI midlayer no longer generates non-SG commands.
	 */
	if (likely(scmnd->use_sg)) {
		nents = scmnd->use_sg;
		scat  = scmnd->request_buffer;
	} else {
		nents = 1;
		scat  = &req->fake_sg;
		sg_init_one(scat, scmnd->request_buffer, scmnd->request_bufflen);
	}
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	count = dma_map_sg(target->srp_host->dev->dma_device, scat, nents,
			   scmnd->sc_data_direction);
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	if (count == 1) {
		struct srp_direct_buf *buf = (void *) cmd->add_data;
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		fmt = SRP_DATA_DESC_DIRECT;
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		buf->va  = cpu_to_be64(sg_dma_address(scat));
		buf->key = cpu_to_be32(target->srp_host->mr->rkey);
		buf->len = cpu_to_be32(sg_dma_len(scat));
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		len = sizeof (struct srp_cmd) +
			sizeof (struct srp_direct_buf);
	} else {
		struct srp_indirect_buf *buf = (void *) cmd->add_data;
		u32 datalen = 0;
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		fmt = SRP_DATA_DESC_INDIRECT;
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		if (scmnd->sc_data_direction == DMA_TO_DEVICE)
			cmd->data_out_desc_cnt = count;
		else
			cmd->data_in_desc_cnt = count;

		buf->table_desc.va  = cpu_to_be64(req->cmd->dma +
						  sizeof *cmd +
						  sizeof *buf);
		buf->table_desc.key =
			cpu_to_be32(target->srp_host->mr->rkey);
		buf->table_desc.len =
			cpu_to_be32(count * sizeof (struct srp_direct_buf));

		for (i = 0; i < count; ++i) {
			buf->desc_list[i].va  = cpu_to_be64(sg_dma_address(&scat[i]));
			buf->desc_list[i].key =
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				cpu_to_be32(target->srp_host->mr->rkey);
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			buf->desc_list[i].len = cpu_to_be32(sg_dma_len(&scat[i]));
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			datalen += sg_dma_len(&scat[i]);
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		}

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		buf->len = cpu_to_be32(datalen);
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		len = sizeof (struct srp_cmd) +
			sizeof (struct srp_indirect_buf) +
			count * sizeof (struct srp_direct_buf);
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	}

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

	return len;
}

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static void srp_remove_req(struct srp_target_port *target, struct srp_request *req)
621
{
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	srp_unmap_data(req->scmnd, target, req);
	list_move_tail(&req->list, &target->free_reqs);
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}

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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 {
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		scmnd = req->scmnd;
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		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))
			scmnd->resid = be32_to_cpu(rsp->data_out_res_cnt);
		else if (rsp->flags & (SRP_RSP_FLAG_DIOVER | SRP_RSP_FLAG_DIUNDER))
			scmnd->resid = be32_to_cpu(rsp->data_in_res_cnt);

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

670
			srp_remove_req(target, req);
671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799
		} else
			req->cmd_done = 1;
	}

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

static void srp_reconnect_work(void *target_ptr)
{
	struct srp_target_port *target = target_ptr;

	srp_reconnect_target(target);
}

static void srp_handle_recv(struct srp_target_port *target, struct ib_wc *wc)
{
	struct srp_iu *iu;
	u8 opcode;

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

	dma_sync_single_for_cpu(target->srp_host->dev->dma_device, iu->dma,
				target->max_ti_iu_len, DMA_FROM_DEVICE);

	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;
	}

	dma_sync_single_for_device(target->srp_host->dev->dma_device, iu->dma,
				   target->max_ti_iu_len, DMA_FROM_DEVICE);
}

static void srp_completion(struct ib_cq *cq, void *target_ptr)
{
	struct srp_target_port *target = target_ptr;
	struct ib_wc wc;
	unsigned long flags;

	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);
			spin_lock_irqsave(target->scsi_host->host_lock, flags);
			if (target->state == SRP_TARGET_LIVE)
				schedule_work(&target->work);
			spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
			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;
	list.lkey   = target->srp_host->mr->lkey;

	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
800 801
 * req_lim and tx_head.  Lock cannot be dropped between call here and
 * call to __srp_post_send().
802 803 804 805 806 807
 */
static struct srp_iu *__srp_get_tx_iu(struct srp_target_port *target)
{
	if (target->tx_head - target->tx_tail >= SRP_SQ_SIZE)
		return NULL;

808 809 810 811 812 813 814
	if (unlikely(target->req_lim < 1)) {
		if (printk_ratelimit())
			printk(KERN_DEBUG PFX "Target has req_lim %d\n",
			       target->req_lim);
		return NULL;
	}

815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875
	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;
	list.lkey   = target->srp_host->mr->lkey;

	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;
	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;
	}

	iu = __srp_get_tx_iu(target);
	if (!iu)
		goto err;

	dma_sync_single_for_cpu(target->srp_host->dev->dma_device, iu->dma,
				SRP_MAX_IU_LEN, DMA_TO_DEVICE);

876
	req = list_entry(target->free_reqs.next, struct srp_request, list);
877 878 879

	scmnd->scsi_done     = done;
	scmnd->result        = 0;
880
	scmnd->host_scribble = (void *) (long) req->index;
881 882 883 884 885 886

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

	cmd->opcode = SRP_CMD;
	cmd->lun    = cpu_to_be64((u64) scmnd->device->lun << 48);
887
	cmd->tag    = req->index;
888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913
	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;
	}

	dma_sync_single_for_device(target->srp_host->dev->dma_device, iu->dma,
				   SRP_MAX_IU_LEN, DMA_TO_DEVICE);

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

914
	list_move_tail(&req->list, &target->req_queue);
915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 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 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136

	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,
						  SRP_MAX_IU_LEN,
						  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:
		if (topspin_workarounds &&
		    !memcmp(&target->ioc_guid, topspin_oui, 3)) {
			/*
			 * 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;
		}

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

		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;

	case IB_CM_MRA_RECEIVED:
		printk(KERN_ERR PFX "MRA received\n");
		break;

	case IB_CM_DREP_RECEIVED:
		break;

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

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

	default:
		printk(KERN_WARNING PFX "Unhandled CM event %d\n", event->event);
		break;
	}

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

	kfree(qp_attr);

	return 0;
}

1137 1138
static int srp_send_tsk_mgmt(struct srp_target_port *target,
			     struct srp_request *req, u8 func)
1139 1140 1141 1142 1143 1144
{
	struct srp_iu *iu;
	struct srp_tsk_mgmt *tsk_mgmt;

	spin_lock_irq(target->scsi_host->host_lock);

1145 1146
	if (target->state == SRP_TARGET_DEAD ||
	    target->state == SRP_TARGET_REMOVED) {
1147
		req->scmnd->result = DID_BAD_TARGET << 16;
1148 1149 1150
		goto out;
	}

1151 1152 1153 1154 1155 1156 1157 1158 1159 1160
	init_completion(&req->done);

	iu = __srp_get_tx_iu(target);
	if (!iu)
		goto out;

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

	tsk_mgmt->opcode 	= SRP_TSK_MGMT;
1161 1162
	tsk_mgmt->lun 		= cpu_to_be64((u64) req->scmnd->device->lun << 48);
	tsk_mgmt->tag 		= req->index | SRP_TAG_TSK_MGMT;
1163
	tsk_mgmt->tsk_mgmt_func = func;
1164
	tsk_mgmt->task_tag 	= req->index;
1165 1166 1167 1168 1169 1170 1171

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

	req->tsk_mgmt = iu;

	spin_unlock_irq(target->scsi_host->host_lock);
1172

1173 1174
	if (!wait_for_completion_timeout(&req->done,
					 msecs_to_jiffies(SRP_ABORT_TIMEOUT_MS)))
1175
		return -1;
1176

1177
	return 0;
1178 1179 1180

out:
	spin_unlock_irq(target->scsi_host->host_lock);
1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193
	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;
1194 1195 1196 1197
}

static int srp_abort(struct scsi_cmnd *scmnd)
{
1198 1199 1200 1201
	struct srp_target_port *target = host_to_target(scmnd->device->host);
	struct srp_request *req;
	int ret = SUCCESS;

1202 1203
	printk(KERN_ERR "SRP abort called\n");

1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222
	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;
1223 1224 1225 1226
}

static int srp_reset_device(struct scsi_cmnd *scmnd)
{
1227 1228 1229
	struct srp_target_port *target = host_to_target(scmnd->device->host);
	struct srp_request *req, *tmp;

1230 1231
	printk(KERN_ERR "SRP reset_device called\n");

1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243
	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)
		if (req->scmnd->device == scmnd->device) {
			req->scmnd->result = DID_RESET << 16;
1244
			req->scmnd->scsi_done(req->scmnd);
1245 1246 1247 1248 1249 1250
			srp_remove_req(target, req);
		}

	spin_unlock_irq(target->scsi_host->host_lock);

	return SUCCESS;
1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265
}

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;
}

1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346
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]));
}

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);

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,
	NULL
};

1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358
static struct scsi_host_template srp_template = {
	.module				= THIS_MODULE,
	.name				= DRV_NAME,
	.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,
	.sg_tablesize			= SRP_MAX_INDIRECT,
	.cmd_per_lun			= SRP_SQ_SIZE,
1359 1360
	.use_clustering			= ENABLE_CLUSTERING,
	.shost_attrs			= srp_host_attrs
1361 1362 1363 1364 1365 1366 1367 1368 1369 1370
};

static int srp_add_target(struct srp_host *host, struct srp_target_port *target)
{
	sprintf(target->target_name, "SRP.T10:%016llX",
		 (unsigned long long) be64_to_cpu(target->id_ext));

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

1371
	mutex_lock(&host->target_mutex);
1372
	list_add_tail(&target->list, &host->target_list);
1373
	mutex_unlock(&host->target_mutex);
1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 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

	target->state = SRP_TARGET_LIVE;

	/* XXX: are we supposed to have a definition of SCAN_WILD_CARD ?? */
	scsi_scan_target(&target->scsi_host->shost_gendev,
			 0, target->scsi_id, ~0, 0);

	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,
	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 = {
	{ 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_ERR,		NULL 		}
};

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);
			target->id_ext = cpu_to_be64(simple_strtoull(p, NULL, 16));
			kfree(p);
			break;

		case SRP_OPT_IOC_GUID:
			p = match_strdup(args);
			target->ioc_guid = cpu_to_be64(simple_strtoull(p, NULL, 16));
			kfree(p);
			break;

		case SRP_OPT_DGID:
			p = match_strdup(args);
			if (strlen(p) != 32) {
				printk(KERN_WARNING PFX "bad dest GID parameter '%s'\n", p);
1470
				kfree(p);
1471 1472 1473 1474 1475 1476 1477
				goto out;
			}

			for (i = 0; i < 16; ++i) {
				strlcpy(dgid, p + i * 2, 3);
				target->path.dgid.raw[i] = simple_strtoul(dgid, NULL, 16);
			}
1478
			kfree(p);
1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539
			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);
			target->service_id = cpu_to_be64(simple_strtoull(p, NULL, 16));
			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;

		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;

R
Roland Dreier 已提交
1540 1541
	target_host->max_lun = SRP_MAX_LUN;

1542 1543 1544 1545 1546 1547 1548 1549
	target = host_to_target(target_host);
	memset(target, 0, sizeof *target);

	target->scsi_host  = target_host;
	target->srp_host   = host;

	INIT_WORK(&target->work, srp_reconnect_work, target);

1550
	INIT_LIST_HEAD(&target->free_reqs);
1551
	INIT_LIST_HEAD(&target->req_queue);
1552 1553 1554 1555
	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);
	}
1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636

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

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

	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;

	target->cm_id = ib_create_cm_id(host->dev, srp_cm_handler, target);
	if (IS_ERR(target->cm_id)) {
		ret = PTR_ERR(target->cm_id);
		goto err_free;
	}

	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);

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

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);

1637
static struct srp_host *srp_add_port(struct ib_device *device, u8 port)
1638 1639 1640 1641 1642 1643 1644 1645
{
	struct srp_host *host;

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

	INIT_LIST_HEAD(&host->target_list);
1646
	mutex_init(&host->target_mutex);
1647 1648 1649 1650 1651
	init_completion(&host->released);
	host->dev  = device;
	host->port = port;

	host->initiator_port_id[7] = port;
1652
	memcpy(host->initiator_port_id + 8, &device->node_guid, 8);
1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703

	host->pd   = ib_alloc_pd(device);
	if (IS_ERR(host->pd))
		goto err_free;

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

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

	if (class_device_register(&host->class_dev))
		goto err_mr;
	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);

err_mr:
	ib_dereg_mr(host->mr);

err_pd:
	ib_dealloc_pd(host->pd);

err_free:
	kfree(host);

	return NULL;
}

static void srp_add_one(struct ib_device *device)
{
	struct list_head *dev_list;
	struct srp_host *host;
	int s, e, p;

	dev_list = kmalloc(sizeof *dev_list, GFP_KERNEL);
	if (!dev_list)
1704
		return;
1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716

	INIT_LIST_HEAD(dev_list);

	if (device->node_type == IB_NODE_SWITCH) {
		s = 0;
		e = 0;
	} else {
		s = 1;
		e = device->phys_port_cnt;
	}

	for (p = s; p <= e; ++p) {
1717
		host = srp_add_port(device, p);
1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746
		if (host)
			list_add_tail(&host->list, dev_list);
	}

	ib_set_client_data(device, &srp_client, dev_list);
}

static void srp_remove_one(struct ib_device *device)
{
	struct list_head *dev_list;
	struct srp_host *host, *tmp_host;
	LIST_HEAD(target_list);
	struct srp_target_port *target, *tmp_target;
	unsigned long flags;

	dev_list = ib_get_client_data(device, &srp_client);

	list_for_each_entry_safe(host, tmp_host, dev_list, list) {
		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.
		 */
1747
		mutex_lock(&host->target_mutex);
1748 1749 1750 1751 1752 1753 1754
		list_for_each_entry_safe(target, tmp_target,
					 &host->target_list, list) {
			spin_lock_irqsave(target->scsi_host->host_lock, flags);
			if (target->state != SRP_TARGET_REMOVED)
				target->state = SRP_TARGET_REMOVED;
			spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
		}
1755
		mutex_unlock(&host->target_mutex);
1756 1757 1758 1759 1760 1761 1762 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 1800 1801 1802 1803 1804 1805 1806 1807 1808

		/*
		 * 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) {
			scsi_remove_host(target->scsi_host);
			srp_disconnect_target(target);
			ib_destroy_cm_id(target->cm_id);
			srp_free_target_ib(target);
			scsi_host_put(target->scsi_host);
		}

		ib_dereg_mr(host->mr);
		ib_dealloc_pd(host->pd);
		kfree(host);
	}

	kfree(dev_list);
}

static int __init srp_init_module(void)
{
	int ret;

	ret = class_register(&srp_class);
	if (ret) {
		printk(KERN_ERR PFX "couldn't register class infiniband_srp\n");
		return ret;
	}

	ret = ib_register_client(&srp_client);
	if (ret) {
		printk(KERN_ERR PFX "couldn't register IB client\n");
		class_unregister(&srp_class);
		return ret;
	}

	return 0;
}

static void __exit srp_cleanup_module(void)
{
	ib_unregister_client(&srp_client);
	class_unregister(&srp_class);
}

module_init(srp_init_module);
module_exit(srp_cleanup_module);