ib_srp.c 78.0 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.
 */

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#define pr_fmt(fmt) PFX fmt

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#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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Arun Sharma 已提交
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#include <linux/atomic.h>
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#include <scsi/scsi.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_dbg.h>
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#include <scsi/scsi_tcq.h>
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#include <scsi/srp.h>
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#include <scsi/scsi_transport_srp.h>
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#include "ib_srp.h"

#define DRV_NAME	"ib_srp"
#define PFX		DRV_NAME ": "
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#define DRV_VERSION	"1.0"
#define DRV_RELDATE	"July 1, 2013"
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MODULE_AUTHOR("Roland Dreier");
MODULE_DESCRIPTION("InfiniBand SCSI RDMA Protocol initiator "
		   "v" DRV_VERSION " (" DRV_RELDATE ")");
MODULE_LICENSE("Dual BSD/GPL");

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static unsigned int srp_sg_tablesize;
static unsigned int cmd_sg_entries;
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static unsigned int indirect_sg_entries;
static bool allow_ext_sg;
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static int topspin_workarounds = 1;
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module_param(srp_sg_tablesize, uint, 0444);
MODULE_PARM_DESC(srp_sg_tablesize, "Deprecated name for cmd_sg_entries");
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module_param(cmd_sg_entries, uint, 0444);
MODULE_PARM_DESC(cmd_sg_entries,
		 "Default number of gather/scatter entries in the SRP command (default is 12, max 255)");
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module_param(indirect_sg_entries, uint, 0444);
MODULE_PARM_DESC(indirect_sg_entries,
		 "Default max number of gather/scatter entries (default is 12, max is " __stringify(SCSI_MAX_SG_CHAIN_SEGMENTS) ")");

module_param(allow_ext_sg, bool, 0444);
MODULE_PARM_DESC(allow_ext_sg,
		  "Default behavior when there are more than cmd_sg_entries S/G entries after mapping; fails the request when false (default false)");

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

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static struct kernel_param_ops srp_tmo_ops;

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static int srp_reconnect_delay = 10;
module_param_cb(reconnect_delay, &srp_tmo_ops, &srp_reconnect_delay,
		S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(reconnect_delay, "Time between successive reconnect attempts");

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static int srp_fast_io_fail_tmo = 15;
module_param_cb(fast_io_fail_tmo, &srp_tmo_ops, &srp_fast_io_fail_tmo,
		S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(fast_io_fail_tmo,
		 "Number of seconds between the observation of a transport"
		 " layer error and failing all I/O. \"off\" means that this"
		 " functionality is disabled.");

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static int srp_dev_loss_tmo = 600;
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module_param_cb(dev_loss_tmo, &srp_tmo_ops, &srp_dev_loss_tmo,
		S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(dev_loss_tmo,
		 "Maximum number of seconds that the SRP transport should"
		 " insulate transport layer errors. After this time has been"
		 " exceeded the SCSI host is removed. Should be"
		 " between 1 and " __stringify(SCSI_DEVICE_BLOCK_MAX_TIMEOUT)
		 " if fast_io_fail_tmo has not been set. \"off\" means that"
		 " this functionality is disabled.");

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static void srp_add_one(struct ib_device *device);
static void srp_remove_one(struct ib_device *device);
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static void srp_recv_completion(struct ib_cq *cq, void *target_ptr);
static void srp_send_completion(struct ib_cq *cq, void *target_ptr);
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static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event);

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static struct scsi_transport_template *ib_srp_transport_template;

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

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static struct ib_sa_client srp_sa_client;

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static int srp_tmo_get(char *buffer, const struct kernel_param *kp)
{
	int tmo = *(int *)kp->arg;

	if (tmo >= 0)
		return sprintf(buffer, "%d", tmo);
	else
		return sprintf(buffer, "off");
}

static int srp_tmo_set(const char *val, const struct kernel_param *kp)
{
	int tmo, res;

	if (strncmp(val, "off", 3) != 0) {
		res = kstrtoint(val, 0, &tmo);
		if (res)
			goto out;
	} else {
		tmo = -1;
	}
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	if (kp->arg == &srp_reconnect_delay)
		res = srp_tmo_valid(tmo, srp_fast_io_fail_tmo,
				    srp_dev_loss_tmo);
	else if (kp->arg == &srp_fast_io_fail_tmo)
		res = srp_tmo_valid(srp_reconnect_delay, tmo, srp_dev_loss_tmo);
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	else
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		res = srp_tmo_valid(srp_reconnect_delay, srp_fast_io_fail_tmo,
				    tmo);
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	if (res)
		goto out;
	*(int *)kp->arg = tmo;

out:
	return res;
}

static struct kernel_param_ops srp_tmo_ops = {
	.get = srp_tmo_get,
	.set = srp_tmo_set,
};

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static inline struct srp_target_port *host_to_target(struct Scsi_Host *host)
{
	return (struct srp_target_port *) host->hostdata;
}

static const char *srp_target_info(struct Scsi_Host *host)
{
	return host_to_target(host)->target_name;
}

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static int srp_target_is_topspin(struct srp_target_port *target)
{
	static const u8 topspin_oui[3] = { 0x00, 0x05, 0xad };
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	static const u8 cisco_oui[3]   = { 0x00, 0x1b, 0x0d };
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	return topspin_workarounds &&
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		(!memcmp(&target->ioc_guid, topspin_oui, sizeof topspin_oui) ||
		 !memcmp(&target->ioc_guid, cisco_oui, sizeof cisco_oui));
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}

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static struct srp_iu *srp_alloc_iu(struct srp_host *host, size_t size,
				   gfp_t gfp_mask,
				   enum dma_data_direction direction)
{
	struct srp_iu *iu;

	iu = kmalloc(sizeof *iu, gfp_mask);
	if (!iu)
		goto out;

	iu->buf = kzalloc(size, gfp_mask);
	if (!iu->buf)
		goto out_free_iu;

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	iu->dma = ib_dma_map_single(host->srp_dev->dev, iu->buf, size,
				    direction);
	if (ib_dma_mapping_error(host->srp_dev->dev, iu->dma))
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		goto out_free_buf;

	iu->size      = size;
	iu->direction = direction;

	return iu;

out_free_buf:
	kfree(iu->buf);
out_free_iu:
	kfree(iu);
out:
	return NULL;
}

static void srp_free_iu(struct srp_host *host, struct srp_iu *iu)
{
	if (!iu)
		return;

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	ib_dma_unmap_single(host->srp_dev->dev, iu->dma, iu->size,
			    iu->direction);
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	kfree(iu->buf);
	kfree(iu);
}

static void srp_qp_event(struct ib_event *event, void *context)
{
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	pr_debug("QP event %d\n", event->event);
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}

static int srp_init_qp(struct srp_target_port *target,
		       struct ib_qp *qp)
{
	struct ib_qp_attr *attr;
	int ret;

	attr = kmalloc(sizeof *attr, GFP_KERNEL);
	if (!attr)
		return -ENOMEM;

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	ret = ib_find_pkey(target->srp_host->srp_dev->dev,
			   target->srp_host->port,
			   be16_to_cpu(target->path.pkey),
			   &attr->pkey_index);
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	if (ret)
		goto out;

	attr->qp_state        = IB_QPS_INIT;
	attr->qp_access_flags = (IB_ACCESS_REMOTE_READ |
				    IB_ACCESS_REMOTE_WRITE);
	attr->port_num        = target->srp_host->port;

	ret = ib_modify_qp(qp, attr,
			   IB_QP_STATE		|
			   IB_QP_PKEY_INDEX	|
			   IB_QP_ACCESS_FLAGS	|
			   IB_QP_PORT);

out:
	kfree(attr);
	return ret;
}

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David Dillow 已提交
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static int srp_new_cm_id(struct srp_target_port *target)
{
	struct ib_cm_id *new_cm_id;

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	new_cm_id = ib_create_cm_id(target->srp_host->srp_dev->dev,
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David Dillow 已提交
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				    srp_cm_handler, target);
	if (IS_ERR(new_cm_id))
		return PTR_ERR(new_cm_id);

	if (target->cm_id)
		ib_destroy_cm_id(target->cm_id);
	target->cm_id = new_cm_id;

	return 0;
}

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static int srp_create_target_ib(struct srp_target_port *target)
{
	struct ib_qp_init_attr *init_attr;
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	struct ib_cq *recv_cq, *send_cq;
	struct ib_qp *qp;
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	int ret;

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

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

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

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	ib_req_notify_cq(recv_cq, IB_CQ_NEXT_COMP);
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	init_attr->event_handler       = srp_qp_event;
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	init_attr->cap.max_send_wr     = target->queue_size;
	init_attr->cap.max_recv_wr     = target->queue_size;
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	init_attr->cap.max_recv_sge    = 1;
	init_attr->cap.max_send_sge    = 1;
	init_attr->sq_sig_type         = IB_SIGNAL_ALL_WR;
	init_attr->qp_type             = IB_QPT_RC;
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	init_attr->send_cq             = send_cq;
	init_attr->recv_cq             = recv_cq;
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	qp = ib_create_qp(target->srp_host->srp_dev->pd, init_attr);
	if (IS_ERR(qp)) {
		ret = PTR_ERR(qp);
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		goto err_send_cq;
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	}

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	ret = srp_init_qp(target, qp);
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	if (ret)
		goto err_qp;
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	if (target->qp)
		ib_destroy_qp(target->qp);
	if (target->recv_cq)
		ib_destroy_cq(target->recv_cq);
	if (target->send_cq)
		ib_destroy_cq(target->send_cq);

	target->qp = qp;
	target->recv_cq = recv_cq;
	target->send_cq = send_cq;

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	kfree(init_attr);
	return 0;

err_qp:
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	ib_destroy_qp(qp);
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err_send_cq:
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	ib_destroy_cq(send_cq);
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err_recv_cq:
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	ib_destroy_cq(recv_cq);
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err:
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	kfree(init_attr);
	return ret;
}

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/*
 * Note: this function may be called without srp_alloc_iu_bufs() having been
 * invoked. Hence the target->[rt]x_ring checks.
 */
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static void srp_free_target_ib(struct srp_target_port *target)
{
	int i;

	ib_destroy_qp(target->qp);
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	ib_destroy_cq(target->send_cq);
	ib_destroy_cq(target->recv_cq);
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	target->qp = NULL;
	target->send_cq = target->recv_cq = NULL;

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	if (target->rx_ring) {
		for (i = 0; i < target->queue_size; ++i)
			srp_free_iu(target->srp_host, target->rx_ring[i]);
		kfree(target->rx_ring);
		target->rx_ring = NULL;
	}
	if (target->tx_ring) {
		for (i = 0; i < target->queue_size; ++i)
			srp_free_iu(target->srp_host, target->tx_ring[i]);
		kfree(target->tx_ring);
		target->tx_ring = NULL;
	}
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}

static void srp_path_rec_completion(int status,
				    struct ib_sa_path_rec *pathrec,
				    void *target_ptr)
{
	struct srp_target_port *target = target_ptr;

	target->status = status;
	if (status)
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		shost_printk(KERN_ERR, target->scsi_host,
			     PFX "Got failed path rec status %d\n", status);
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	else
		target->path = *pathrec;
	complete(&target->done);
}

static int srp_lookup_path(struct srp_target_port *target)
{
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	int ret;

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	target->path.numb_path = 1;

	init_completion(&target->done);

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	target->path_query_id = ib_sa_path_rec_get(&srp_sa_client,
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						   target->srp_host->srp_dev->dev,
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						   target->srp_host->port,
						   &target->path,
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						   IB_SA_PATH_REC_SERVICE_ID	|
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						   IB_SA_PATH_REC_DGID		|
						   IB_SA_PATH_REC_SGID		|
						   IB_SA_PATH_REC_NUMB_PATH	|
						   IB_SA_PATH_REC_PKEY,
						   SRP_PATH_REC_TIMEOUT_MS,
						   GFP_KERNEL,
						   srp_path_rec_completion,
						   target, &target->path_query);
	if (target->path_query_id < 0)
		return target->path_query_id;

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	ret = wait_for_completion_interruptible(&target->done);
	if (ret < 0)
		return ret;
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	if (target->status < 0)
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		shost_printk(KERN_WARNING, target->scsi_host,
			     PFX "Path record query failed\n");
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	return target->status;
}

static int srp_send_req(struct srp_target_port *target)
{
	struct {
		struct ib_cm_req_param param;
		struct srp_login_req   priv;
	} *req = NULL;
	int status;

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

	req->param.primary_path 	      = &target->path;
	req->param.alternate_path 	      = NULL;
	req->param.service_id 		      = target->service_id;
	req->param.qp_num 		      = target->qp->qp_num;
	req->param.qp_type 		      = target->qp->qp_type;
	req->param.private_data 	      = &req->priv;
	req->param.private_data_len 	      = sizeof req->priv;
	req->param.flow_control 	      = 1;

	get_random_bytes(&req->param.starting_psn, 4);
	req->param.starting_psn 	     &= 0xffffff;

	/*
	 * Pick some arbitrary defaults here; we could make these
	 * module parameters if anyone cared about setting them.
	 */
	req->param.responder_resources	      = 4;
	req->param.remote_cm_response_timeout = 20;
	req->param.local_cm_response_timeout  = 20;
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	req->param.retry_count                = target->tl_retry_count;
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	req->param.rnr_retry_count 	      = 7;
	req->param.max_cm_retries 	      = 15;

	req->priv.opcode     	= SRP_LOGIN_REQ;
	req->priv.tag        	= 0;
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	req->priv.req_it_iu_len = cpu_to_be32(target->max_iu_len);
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	req->priv.req_buf_fmt 	= cpu_to_be16(SRP_BUF_FORMAT_DIRECT |
					      SRP_BUF_FORMAT_INDIRECT);
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	/*
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Roland Dreier 已提交
488
	 * 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.
516
	 */
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	if (srp_target_is_topspin(target)) {
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		shost_printk(KERN_DEBUG, target->scsi_host,
			     PFX "Topspin/Cisco initiator port ID workaround "
			     "activated for target GUID %016llx\n",
			     (unsigned long long) be64_to_cpu(target->ioc_guid));
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		memset(req->priv.initiator_port_id, 0, 8);
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		memcpy(req->priv.initiator_port_id + 8,
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		       &target->srp_host->srp_dev->dev->node_guid, 8);
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	}

	status = ib_send_cm_req(target->cm_id, &req->param);

	kfree(req);

	return status;
}

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static bool srp_queue_remove_work(struct srp_target_port *target)
{
	bool changed = false;

	spin_lock_irq(&target->lock);
	if (target->state != SRP_TARGET_REMOVED) {
		target->state = SRP_TARGET_REMOVED;
		changed = true;
	}
	spin_unlock_irq(&target->lock);

	if (changed)
		queue_work(system_long_wq, &target->remove_work);

	return changed;
}

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static bool srp_change_conn_state(struct srp_target_port *target,
				  bool connected)
{
	bool changed = false;

	spin_lock_irq(&target->lock);
	if (target->connected != connected) {
		target->connected = connected;
		changed = true;
	}
	spin_unlock_irq(&target->lock);

	return changed;
}

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static void srp_disconnect_target(struct srp_target_port *target)
{
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	if (srp_change_conn_state(target, false)) {
		/* XXX should send SRP_I_LOGOUT request */
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		if (ib_send_cm_dreq(target->cm_id, NULL, 0)) {
			shost_printk(KERN_DEBUG, target->scsi_host,
				     PFX "Sending CM DREQ failed\n");
		}
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	}
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}

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static void srp_free_req_data(struct srp_target_port *target)
{
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	struct ib_device *ibdev = target->srp_host->srp_dev->dev;
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	struct srp_request *req;
	int i;

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	if (!target->req_ring)
		return;

	for (i = 0; i < target->req_ring_size; ++i) {
		req = &target->req_ring[i];
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		kfree(req->fmr_list);
		kfree(req->map_page);
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		if (req->indirect_dma_addr) {
			ib_dma_unmap_single(ibdev, req->indirect_dma_addr,
					    target->indirect_size,
					    DMA_TO_DEVICE);
		}
		kfree(req->indirect_desc);
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	}
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	kfree(target->req_ring);
	target->req_ring = NULL;
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}

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static int srp_alloc_req_data(struct srp_target_port *target)
{
	struct srp_device *srp_dev = target->srp_host->srp_dev;
	struct ib_device *ibdev = srp_dev->dev;
	struct srp_request *req;
	dma_addr_t dma_addr;
	int i, ret = -ENOMEM;

	INIT_LIST_HEAD(&target->free_reqs);

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	target->req_ring = kzalloc(target->req_ring_size *
				   sizeof(*target->req_ring), GFP_KERNEL);
	if (!target->req_ring)
		goto out;

	for (i = 0; i < target->req_ring_size; ++i) {
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		req = &target->req_ring[i];
		req->fmr_list = kmalloc(target->cmd_sg_cnt * sizeof(void *),
					GFP_KERNEL);
		req->map_page = kmalloc(SRP_FMR_SIZE * sizeof(void *),
					GFP_KERNEL);
		req->indirect_desc = kmalloc(target->indirect_size, GFP_KERNEL);
		if (!req->fmr_list || !req->map_page || !req->indirect_desc)
			goto out;

		dma_addr = ib_dma_map_single(ibdev, req->indirect_desc,
					     target->indirect_size,
					     DMA_TO_DEVICE);
		if (ib_dma_mapping_error(ibdev, dma_addr))
			goto out;

		req->indirect_dma_addr = dma_addr;
		req->index = i;
		list_add_tail(&req->list, &target->free_reqs);
	}
	ret = 0;

out:
	return ret;
}

644 645 646 647 648 649 650 651 652 653 654 655 656 657 658
/**
 * srp_del_scsi_host_attr() - Remove attributes defined in the host template.
 * @shost: SCSI host whose attributes to remove from sysfs.
 *
 * Note: Any attributes defined in the host template and that did not exist
 * before invocation of this function will be ignored.
 */
static void srp_del_scsi_host_attr(struct Scsi_Host *shost)
{
	struct device_attribute **attr;

	for (attr = shost->hostt->shost_attrs; attr && *attr; ++attr)
		device_remove_file(&shost->shost_dev, *attr);
}

659 660
static void srp_remove_target(struct srp_target_port *target)
{
661 662
	WARN_ON_ONCE(target->state != SRP_TARGET_REMOVED);

663
	srp_del_scsi_host_attr(target->scsi_host);
664
	srp_rport_get(target->rport);
665 666
	srp_remove_host(target->scsi_host);
	scsi_remove_host(target->scsi_host);
667
	srp_stop_rport_timers(target->rport);
668
	srp_disconnect_target(target);
669 670
	ib_destroy_cm_id(target->cm_id);
	srp_free_target_ib(target);
671
	cancel_work_sync(&target->tl_err_work);
672
	srp_rport_put(target->rport);
673
	srp_free_req_data(target);
674 675 676 677 678

	spin_lock(&target->srp_host->target_lock);
	list_del(&target->list);
	spin_unlock(&target->srp_host->target_lock);

679 680 681
	scsi_host_put(target->scsi_host);
}

D
David Howells 已提交
682
static void srp_remove_work(struct work_struct *work)
683
{
D
David Howells 已提交
684
	struct srp_target_port *target =
685
		container_of(work, struct srp_target_port, remove_work);
686

687
	WARN_ON_ONCE(target->state != SRP_TARGET_REMOVED);
688

689
	srp_remove_target(target);
690 691
}

692 693 694 695 696 697 698
static void srp_rport_delete(struct srp_rport *rport)
{
	struct srp_target_port *target = rport->lld_data;

	srp_queue_remove_work(target);
}

699 700
static int srp_connect_target(struct srp_target_port *target)
{
D
David Dillow 已提交
701
	int retries = 3;
702 703
	int ret;

704 705
	WARN_ON_ONCE(target->connected);

706 707
	target->qp_in_error = false;

708 709 710 711 712 713 714 715 716
	ret = srp_lookup_path(target);
	if (ret)
		return ret;

	while (1) {
		init_completion(&target->done);
		ret = srp_send_req(target);
		if (ret)
			return ret;
717 718 719
		ret = wait_for_completion_interruptible(&target->done);
		if (ret < 0)
			return ret;
720 721 722 723 724 725 726 727 728

		/*
		 * 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:
729
			srp_change_conn_state(target, true);
730 731 732 733 734 735 736 737 738 739 740
			return 0;

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

		case SRP_DLID_REDIRECT:
			break;

D
David Dillow 已提交
741 742 743 744 745 746 747 748 749 750 751 752 753 754 755
		case SRP_STALE_CONN:
			/* Our current CM id was stale, and is now in timewait.
			 * Try to reconnect with a new one.
			 */
			if (!retries-- || srp_new_cm_id(target)) {
				shost_printk(KERN_ERR, target->scsi_host, PFX
					     "giving up on stale connection\n");
				target->status = -ECONNRESET;
				return target->status;
			}

			shost_printk(KERN_ERR, target->scsi_host, PFX
				     "retrying stale connection\n");
			break;

756 757 758 759 760 761
		default:
			return target->status;
		}
	}
}

762 763 764 765
static void srp_unmap_data(struct scsi_cmnd *scmnd,
			   struct srp_target_port *target,
			   struct srp_request *req)
{
766 767 768
	struct ib_device *ibdev = target->srp_host->srp_dev->dev;
	struct ib_pool_fmr **pfmr;

769
	if (!scsi_sglist(scmnd) ||
770 771 772 773
	    (scmnd->sc_data_direction != DMA_TO_DEVICE &&
	     scmnd->sc_data_direction != DMA_FROM_DEVICE))
		return;

774 775 776
	pfmr = req->fmr_list;
	while (req->nfmr--)
		ib_fmr_pool_unmap(*pfmr++);
777

778 779
	ib_dma_unmap_sg(ibdev, scsi_sglist(scmnd), scsi_sg_count(scmnd),
			scmnd->sc_data_direction);
780 781
}

B
Bart Van Assche 已提交
782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817
/**
 * srp_claim_req - Take ownership of the scmnd associated with a request.
 * @target: SRP target port.
 * @req: SRP request.
 * @scmnd: If NULL, take ownership of @req->scmnd. If not NULL, only take
 *         ownership of @req->scmnd if it equals @scmnd.
 *
 * Return value:
 * Either NULL or a pointer to the SCSI command the caller became owner of.
 */
static struct scsi_cmnd *srp_claim_req(struct srp_target_port *target,
				       struct srp_request *req,
				       struct scsi_cmnd *scmnd)
{
	unsigned long flags;

	spin_lock_irqsave(&target->lock, flags);
	if (!scmnd) {
		scmnd = req->scmnd;
		req->scmnd = NULL;
	} else if (req->scmnd == scmnd) {
		req->scmnd = NULL;
	} else {
		scmnd = NULL;
	}
	spin_unlock_irqrestore(&target->lock, flags);

	return scmnd;
}

/**
 * srp_free_req() - Unmap data and add request to the free request list.
 */
static void srp_free_req(struct srp_target_port *target,
			 struct srp_request *req, struct scsi_cmnd *scmnd,
			 s32 req_lim_delta)
818
{
819 820
	unsigned long flags;

B
Bart Van Assche 已提交
821 822
	srp_unmap_data(scmnd, target, req);

823
	spin_lock_irqsave(&target->lock, flags);
824
	target->req_lim += req_lim_delta;
825
	list_add_tail(&req->list, &target->free_reqs);
826
	spin_unlock_irqrestore(&target->lock, flags);
827 828
}

829 830
static void srp_finish_req(struct srp_target_port *target,
			   struct srp_request *req, int result)
831
{
B
Bart Van Assche 已提交
832 833 834
	struct scsi_cmnd *scmnd = srp_claim_req(target, req, NULL);

	if (scmnd) {
835
		srp_free_req(target, req, scmnd, 0);
836
		scmnd->result = result;
B
Bart Van Assche 已提交
837 838
		scmnd->scsi_done(scmnd);
	}
839 840
}

841
static void srp_terminate_io(struct srp_rport *rport)
842
{
843 844 845
	struct srp_target_port *target = rport->lld_data;
	int i;

846
	for (i = 0; i < target->req_ring_size; ++i) {
847 848 849 850
		struct srp_request *req = &target->req_ring[i];
		srp_finish_req(target, req, DID_TRANSPORT_FAILFAST << 16);
	}
}
851

852 853 854 855 856 857 858 859 860 861 862 863 864
/*
 * It is up to the caller to ensure that srp_rport_reconnect() calls are
 * serialized and that no concurrent srp_queuecommand(), srp_abort(),
 * srp_reset_device() or srp_reset_host() calls will occur while this function
 * is in progress. One way to realize that is not to call this function
 * directly but to call srp_reconnect_rport() instead since that last function
 * serializes calls of this function via rport->mutex and also blocks
 * srp_queuecommand() calls before invoking this function.
 */
static int srp_rport_reconnect(struct srp_rport *rport)
{
	struct srp_target_port *target = rport->lld_data;
	int i, ret;
865

866 867
	srp_disconnect_target(target);
	/*
868 869 870
	 * Now get a new local CM ID so that we avoid confusing the target in
	 * case things are really fouled up. Doing so also ensures that all CM
	 * callbacks will have finished before a new QP is allocated.
871
	 */
D
David Dillow 已提交
872
	ret = srp_new_cm_id(target);
873 874 875 876 877 878 879 880 881
	/*
	 * Whether or not creating a new CM ID succeeded, create a new
	 * QP. This guarantees that all completion callback function
	 * invocations have finished before request resetting starts.
	 */
	if (ret == 0)
		ret = srp_create_target_ib(target);
	else
		srp_create_target_ib(target);
882

883
	for (i = 0; i < target->req_ring_size; ++i) {
884
		struct srp_request *req = &target->req_ring[i];
885
		srp_finish_req(target, req, DID_RESET << 16);
886
	}
887

888
	INIT_LIST_HEAD(&target->free_tx);
889
	for (i = 0; i < target->queue_size; ++i)
890
		list_add(&target->tx_ring[i]->list, &target->free_tx);
891

892 893
	if (ret == 0)
		ret = srp_connect_target(target);
894

895 896 897
	if (ret == 0)
		shost_printk(KERN_INFO, target->scsi_host,
			     PFX "reconnect succeeded\n");
898 899 900 901

	return ret;
}

902 903
static void srp_map_desc(struct srp_map_state *state, dma_addr_t dma_addr,
			 unsigned int dma_len, u32 rkey)
904
{
905
	struct srp_direct_buf *desc = state->desc;
906

907 908 909
	desc->va = cpu_to_be64(dma_addr);
	desc->key = cpu_to_be32(rkey);
	desc->len = cpu_to_be32(dma_len);
910

911 912 913 914
	state->total_len += dma_len;
	state->desc++;
	state->ndesc++;
}
915

916 917 918 919 920 921
static int srp_map_finish_fmr(struct srp_map_state *state,
			      struct srp_target_port *target)
{
	struct srp_device *dev = target->srp_host->srp_dev;
	struct ib_pool_fmr *fmr;
	u64 io_addr = 0;
922

923 924
	if (!state->npages)
		return 0;
925

926 927 928 929 930
	if (state->npages == 1) {
		srp_map_desc(state, state->base_dma_addr, state->fmr_len,
			     target->rkey);
		state->npages = state->fmr_len = 0;
		return 0;
931 932
	}

933 934 935 936
	fmr = ib_fmr_pool_map_phys(dev->fmr_pool, state->pages,
				   state->npages, io_addr);
	if (IS_ERR(fmr))
		return PTR_ERR(fmr);
937

938 939
	*state->next_fmr++ = fmr;
	state->nfmr++;
940

941 942 943 944 945 946 947 948 949 950 951 952 953
	srp_map_desc(state, 0, state->fmr_len, fmr->fmr->rkey);
	state->npages = state->fmr_len = 0;
	return 0;
}

static void srp_map_update_start(struct srp_map_state *state,
				 struct scatterlist *sg, int sg_index,
				 dma_addr_t dma_addr)
{
	state->unmapped_sg = sg;
	state->unmapped_index = sg_index;
	state->unmapped_addr = dma_addr;
}
954

955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976
static int srp_map_sg_entry(struct srp_map_state *state,
			    struct srp_target_port *target,
			    struct scatterlist *sg, int sg_index,
			    int use_fmr)
{
	struct srp_device *dev = target->srp_host->srp_dev;
	struct ib_device *ibdev = dev->dev;
	dma_addr_t dma_addr = ib_sg_dma_address(ibdev, sg);
	unsigned int dma_len = ib_sg_dma_len(ibdev, sg);
	unsigned int len;
	int ret;

	if (!dma_len)
		return 0;

	if (use_fmr == SRP_MAP_NO_FMR) {
		/* Once we're in direct map mode for a request, we don't
		 * go back to FMR mode, so no need to update anything
		 * other than the descriptor.
		 */
		srp_map_desc(state, dma_addr, dma_len, target->rkey);
		return 0;
977
	}
978

979 980 981 982 983 984 985 986 987 988 989 990 991 992
	/* If we start at an offset into the FMR page, don't merge into
	 * the current FMR. Finish it out, and use the kernel's MR for this
	 * sg entry. This is to avoid potential bugs on some SRP targets
	 * that were never quite defined, but went away when the initiator
	 * avoided using FMR on such page fragments.
	 */
	if (dma_addr & ~dev->fmr_page_mask || dma_len > dev->fmr_max_size) {
		ret = srp_map_finish_fmr(state, target);
		if (ret)
			return ret;

		srp_map_desc(state, dma_addr, dma_len, target->rkey);
		srp_map_update_start(state, NULL, 0, 0);
		return 0;
993 994
	}

995 996 997 998 999 1000 1001
	/* If this is the first sg to go into the FMR, save our position.
	 * We need to know the first unmapped entry, its index, and the
	 * first unmapped address within that entry to be able to restart
	 * mapping after an error.
	 */
	if (!state->unmapped_sg)
		srp_map_update_start(state, sg, sg_index, dma_addr);
1002

1003 1004 1005 1006 1007
	while (dma_len) {
		if (state->npages == SRP_FMR_SIZE) {
			ret = srp_map_finish_fmr(state, target);
			if (ret)
				return ret;
1008

1009 1010 1011 1012
			srp_map_update_start(state, sg, sg_index, dma_addr);
		}

		len = min_t(unsigned int, dma_len, dev->fmr_page_size);
1013

1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031
		if (!state->npages)
			state->base_dma_addr = dma_addr;
		state->pages[state->npages++] = dma_addr;
		state->fmr_len += len;
		dma_addr += len;
		dma_len -= len;
	}

	/* If the last entry of the FMR wasn't a full page, then we need to
	 * close it out and start a new one -- we can only merge at page
	 * boundries.
	 */
	ret = 0;
	if (len != dev->fmr_page_size) {
		ret = srp_map_finish_fmr(state, target);
		if (!ret)
			srp_map_update_start(state, NULL, 0, 0);
	}
1032 1033 1034
	return ret;
}

1035 1036 1037
static int srp_map_data(struct scsi_cmnd *scmnd, struct srp_target_port *target,
			struct srp_request *req)
{
1038
	struct scatterlist *scat, *sg;
1039
	struct srp_cmd *cmd = req->cmd->buf;
1040
	int i, len, nents, count, use_fmr;
1041 1042
	struct srp_device *dev;
	struct ib_device *ibdev;
1043 1044 1045 1046
	struct srp_map_state state;
	struct srp_indirect_buf *indirect_hdr;
	u32 table_len;
	u8 fmt;
1047

1048
	if (!scsi_sglist(scmnd) || scmnd->sc_data_direction == DMA_NONE)
1049 1050 1051 1052
		return sizeof (struct srp_cmd);

	if (scmnd->sc_data_direction != DMA_FROM_DEVICE &&
	    scmnd->sc_data_direction != DMA_TO_DEVICE) {
1053 1054 1055
		shost_printk(KERN_WARNING, target->scsi_host,
			     PFX "Unhandled data direction %d\n",
			     scmnd->sc_data_direction);
1056 1057 1058
		return -EINVAL;
	}

1059 1060
	nents = scsi_sg_count(scmnd);
	scat  = scsi_sglist(scmnd);
1061

1062
	dev = target->srp_host->srp_dev;
1063 1064 1065
	ibdev = dev->dev;

	count = ib_dma_map_sg(ibdev, scat, nents, scmnd->sc_data_direction);
1066 1067
	if (unlikely(count == 0))
		return -EIO;
1068 1069 1070

	fmt = SRP_DATA_DESC_DIRECT;
	len = sizeof (struct srp_cmd) +	sizeof (struct srp_direct_buf);
1071

1072
	if (count == 1) {
1073 1074 1075 1076 1077 1078
		/*
		 * 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.
		 */
1079
		struct srp_direct_buf *buf = (void *) cmd->add_data;
1080

1081
		buf->va  = cpu_to_be64(ib_sg_dma_address(ibdev, scat));
1082
		buf->key = cpu_to_be32(target->rkey);
1083
		buf->len = cpu_to_be32(ib_sg_dma_len(ibdev, scat));
1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094

		req->nfmr = 0;
		goto map_complete;
	}

	/* We have more than one scatter/gather entry, so build our indirect
	 * descriptor table, trying to merge as many entries with FMR as we
	 * can.
	 */
	indirect_hdr = (void *) cmd->add_data;

1095 1096 1097
	ib_dma_sync_single_for_cpu(ibdev, req->indirect_dma_addr,
				   target->indirect_size, DMA_TO_DEVICE);

1098
	memset(&state, 0, sizeof(state));
1099
	state.desc	= req->indirect_desc;
1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122
	state.pages	= req->map_page;
	state.next_fmr	= req->fmr_list;

	use_fmr = dev->fmr_pool ? SRP_MAP_ALLOW_FMR : SRP_MAP_NO_FMR;

	for_each_sg(scat, sg, count, i) {
		if (srp_map_sg_entry(&state, target, sg, i, use_fmr)) {
			/* FMR mapping failed, so backtrack to the first
			 * unmapped entry and continue on without using FMR.
			 */
			dma_addr_t dma_addr;
			unsigned int dma_len;

backtrack:
			sg = state.unmapped_sg;
			i = state.unmapped_index;

			dma_addr = ib_sg_dma_address(ibdev, sg);
			dma_len = ib_sg_dma_len(ibdev, sg);
			dma_len -= (state.unmapped_addr - dma_addr);
			dma_addr = state.unmapped_addr;
			use_fmr = SRP_MAP_NO_FMR;
			srp_map_desc(&state, dma_addr, dma_len, target->rkey);
1123
		}
1124
	}
1125

1126 1127
	if (use_fmr == SRP_MAP_ALLOW_FMR && srp_map_finish_fmr(&state, target))
		goto backtrack;
1128

1129 1130 1131 1132 1133
	/* We've mapped the request, now pull as much of the indirect
	 * descriptor table as we can into the command buffer. If this
	 * target is not using an external indirect table, we are
	 * guaranteed to fit into the command, as the SCSI layer won't
	 * give us more S/G entries than we allow.
1134 1135 1136 1137 1138 1139 1140
	 */
	req->nfmr = state.nfmr;
	if (state.ndesc == 1) {
		/* FMR mapping was able to collapse this to one entry,
		 * so use a direct descriptor.
		 */
		struct srp_direct_buf *buf = (void *) cmd->add_data;
1141

1142
		*buf = req->indirect_desc[0];
1143
		goto map_complete;
1144 1145
	}

1146 1147 1148 1149 1150 1151 1152 1153
	if (unlikely(target->cmd_sg_cnt < state.ndesc &&
						!target->allow_ext_sg)) {
		shost_printk(KERN_ERR, target->scsi_host,
			     "Could not fit S/G list into SRP_CMD\n");
		return -EIO;
	}

	count = min(state.ndesc, target->cmd_sg_cnt);
1154 1155 1156 1157
	table_len = state.ndesc * sizeof (struct srp_direct_buf);

	fmt = SRP_DATA_DESC_INDIRECT;
	len = sizeof(struct srp_cmd) + sizeof (struct srp_indirect_buf);
1158
	len += count * sizeof (struct srp_direct_buf);
1159

1160 1161
	memcpy(indirect_hdr->desc_list, req->indirect_desc,
	       count * sizeof (struct srp_direct_buf));
1162

1163
	indirect_hdr->table_desc.va = cpu_to_be64(req->indirect_dma_addr);
1164 1165 1166 1167 1168
	indirect_hdr->table_desc.key = cpu_to_be32(target->rkey);
	indirect_hdr->table_desc.len = cpu_to_be32(table_len);
	indirect_hdr->len = cpu_to_be32(state.total_len);

	if (scmnd->sc_data_direction == DMA_TO_DEVICE)
1169
		cmd->data_out_desc_cnt = count;
1170
	else
1171 1172 1173 1174
		cmd->data_in_desc_cnt = count;

	ib_dma_sync_single_for_device(ibdev, req->indirect_dma_addr, table_len,
				      DMA_TO_DEVICE);
1175 1176

map_complete:
1177 1178 1179 1180 1181 1182 1183 1184
	if (scmnd->sc_data_direction == DMA_TO_DEVICE)
		cmd->buf_fmt = fmt << 4;
	else
		cmd->buf_fmt = fmt;

	return len;
}

1185 1186 1187 1188 1189 1190 1191 1192
/*
 * Return an IU and possible credit to the free pool
 */
static void srp_put_tx_iu(struct srp_target_port *target, struct srp_iu *iu,
			  enum srp_iu_type iu_type)
{
	unsigned long flags;

1193
	spin_lock_irqsave(&target->lock, flags);
1194 1195 1196
	list_add(&iu->list, &target->free_tx);
	if (iu_type != SRP_IU_RSP)
		++target->req_lim;
1197
	spin_unlock_irqrestore(&target->lock, flags);
1198 1199
}

1200
/*
1201 1202
 * Must be called with target->lock held to protect req_lim and free_tx.
 * If IU is not sent, it must be returned using srp_put_tx_iu().
1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220
 *
 * Note:
 * An upper limit for the number of allocated information units for each
 * request type is:
 * - SRP_IU_CMD: SRP_CMD_SQ_SIZE, since the SCSI mid-layer never queues
 *   more than Scsi_Host.can_queue requests.
 * - SRP_IU_TSK_MGMT: SRP_TSK_MGMT_SQ_SIZE.
 * - SRP_IU_RSP: 1, since a conforming SRP target never sends more than
 *   one unanswered SRP request to an initiator.
 */
static struct srp_iu *__srp_get_tx_iu(struct srp_target_port *target,
				      enum srp_iu_type iu_type)
{
	s32 rsv = (iu_type == SRP_IU_TSK_MGMT) ? 0 : SRP_TSK_MGMT_SQ_SIZE;
	struct srp_iu *iu;

	srp_send_completion(target->send_cq, target);

1221
	if (list_empty(&target->free_tx))
1222 1223 1224
		return NULL;

	/* Initiator responses to target requests do not consume credits */
1225 1226 1227 1228 1229 1230 1231
	if (iu_type != SRP_IU_RSP) {
		if (target->req_lim <= rsv) {
			++target->zero_req_lim;
			return NULL;
		}

		--target->req_lim;
1232 1233
	}

1234
	iu = list_first_entry(&target->free_tx, struct srp_iu, list);
1235
	list_del(&iu->list);
1236 1237 1238
	return iu;
}

1239 1240
static int srp_post_send(struct srp_target_port *target,
			 struct srp_iu *iu, int len)
1241 1242 1243 1244 1245 1246
{
	struct ib_sge list;
	struct ib_send_wr wr, *bad_wr;

	list.addr   = iu->dma;
	list.length = len;
1247
	list.lkey   = target->lkey;
1248 1249

	wr.next       = NULL;
1250
	wr.wr_id      = (uintptr_t) iu;
1251 1252 1253 1254 1255
	wr.sg_list    = &list;
	wr.num_sge    = 1;
	wr.opcode     = IB_WR_SEND;
	wr.send_flags = IB_SEND_SIGNALED;

1256
	return ib_post_send(target->qp, &wr, &bad_wr);
1257 1258
}

1259
static int srp_post_recv(struct srp_target_port *target, struct srp_iu *iu)
1260 1261
{
	struct ib_recv_wr wr, *bad_wr;
1262
	struct ib_sge list;
1263 1264 1265

	list.addr   = iu->dma;
	list.length = iu->size;
1266
	list.lkey   = target->lkey;
1267 1268

	wr.next     = NULL;
1269
	wr.wr_id    = (uintptr_t) iu;
1270 1271 1272
	wr.sg_list  = &list;
	wr.num_sge  = 1;

1273
	return ib_post_recv(target->qp, &wr, &bad_wr);
1274 1275
}

1276 1277 1278 1279 1280 1281 1282
static void srp_process_rsp(struct srp_target_port *target, struct srp_rsp *rsp)
{
	struct srp_request *req;
	struct scsi_cmnd *scmnd;
	unsigned long flags;

	if (unlikely(rsp->tag & SRP_TAG_TSK_MGMT)) {
1283
		spin_lock_irqsave(&target->lock, flags);
1284
		target->req_lim += be32_to_cpu(rsp->req_lim_delta);
1285
		spin_unlock_irqrestore(&target->lock, flags);
1286

1287 1288 1289 1290
		target->tsk_mgmt_status = -1;
		if (be32_to_cpu(rsp->resp_data_len) >= 4)
			target->tsk_mgmt_status = rsp->data[3];
		complete(&target->tsk_mgmt_done);
1291
	} else {
1292
		req = &target->req_ring[rsp->tag];
B
Bart Van Assche 已提交
1293 1294
		scmnd = srp_claim_req(target, req, NULL);
		if (!scmnd) {
1295 1296 1297
			shost_printk(KERN_ERR, target->scsi_host,
				     "Null scmnd for RSP w/tag %016llx\n",
				     (unsigned long long) rsp->tag);
B
Bart Van Assche 已提交
1298 1299 1300 1301 1302 1303 1304

			spin_lock_irqsave(&target->lock, flags);
			target->req_lim += be32_to_cpu(rsp->req_lim_delta);
			spin_unlock_irqrestore(&target->lock, flags);

			return;
		}
1305 1306 1307 1308 1309 1310 1311 1312 1313 1314
		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))
1315
			scsi_set_resid(scmnd, be32_to_cpu(rsp->data_out_res_cnt));
1316
		else if (rsp->flags & (SRP_RSP_FLAG_DIOVER | SRP_RSP_FLAG_DIUNDER))
1317
			scsi_set_resid(scmnd, be32_to_cpu(rsp->data_in_res_cnt));
1318

B
Bart Van Assche 已提交
1319 1320 1321
		srp_free_req(target, req, scmnd,
			     be32_to_cpu(rsp->req_lim_delta));

1322 1323
		scmnd->host_scribble = NULL;
		scmnd->scsi_done(scmnd);
1324 1325 1326
	}
}

1327 1328 1329
static int srp_response_common(struct srp_target_port *target, s32 req_delta,
			       void *rsp, int len)
{
1330
	struct ib_device *dev = target->srp_host->srp_dev->dev;
1331 1332
	unsigned long flags;
	struct srp_iu *iu;
1333
	int err;
1334

1335
	spin_lock_irqsave(&target->lock, flags);
1336 1337
	target->req_lim += req_delta;
	iu = __srp_get_tx_iu(target, SRP_IU_RSP);
1338
	spin_unlock_irqrestore(&target->lock, flags);
1339

1340 1341 1342
	if (!iu) {
		shost_printk(KERN_ERR, target->scsi_host, PFX
			     "no IU available to send response\n");
1343
		return 1;
1344 1345 1346 1347 1348 1349
	}

	ib_dma_sync_single_for_cpu(dev, iu->dma, len, DMA_TO_DEVICE);
	memcpy(iu->buf, rsp, len);
	ib_dma_sync_single_for_device(dev, iu->dma, len, DMA_TO_DEVICE);

1350 1351
	err = srp_post_send(target, iu, len);
	if (err) {
1352 1353
		shost_printk(KERN_ERR, target->scsi_host, PFX
			     "unable to post response: %d\n", err);
1354 1355
		srp_put_tx_iu(target, iu, SRP_IU_RSP);
	}
1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390

	return err;
}

static void srp_process_cred_req(struct srp_target_port *target,
				 struct srp_cred_req *req)
{
	struct srp_cred_rsp rsp = {
		.opcode = SRP_CRED_RSP,
		.tag = req->tag,
	};
	s32 delta = be32_to_cpu(req->req_lim_delta);

	if (srp_response_common(target, delta, &rsp, sizeof rsp))
		shost_printk(KERN_ERR, target->scsi_host, PFX
			     "problems processing SRP_CRED_REQ\n");
}

static void srp_process_aer_req(struct srp_target_port *target,
				struct srp_aer_req *req)
{
	struct srp_aer_rsp rsp = {
		.opcode = SRP_AER_RSP,
		.tag = req->tag,
	};
	s32 delta = be32_to_cpu(req->req_lim_delta);

	shost_printk(KERN_ERR, target->scsi_host, PFX
		     "ignoring AER for LUN %llu\n", be64_to_cpu(req->lun));

	if (srp_response_common(target, delta, &rsp, sizeof rsp))
		shost_printk(KERN_ERR, target->scsi_host, PFX
			     "problems processing SRP_AER_REQ\n");
}

1391 1392
static void srp_handle_recv(struct srp_target_port *target, struct ib_wc *wc)
{
1393
	struct ib_device *dev = target->srp_host->srp_dev->dev;
1394
	struct srp_iu *iu = (struct srp_iu *) (uintptr_t) wc->wr_id;
1395
	int res;
1396 1397
	u8 opcode;

1398 1399
	ib_dma_sync_single_for_cpu(dev, iu->dma, target->max_ti_iu_len,
				   DMA_FROM_DEVICE);
1400 1401 1402 1403

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

	if (0) {
1404 1405
		shost_printk(KERN_ERR, target->scsi_host,
			     PFX "recv completion, opcode 0x%02x\n", opcode);
B
Bart Van Assche 已提交
1406 1407
		print_hex_dump(KERN_ERR, "", DUMP_PREFIX_OFFSET, 8, 1,
			       iu->buf, wc->byte_len, true);
1408 1409 1410 1411 1412 1413 1414
	}

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

1415 1416 1417 1418 1419 1420 1421 1422
	case SRP_CRED_REQ:
		srp_process_cred_req(target, iu->buf);
		break;

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

1423 1424
	case SRP_T_LOGOUT:
		/* XXX Handle target logout */
1425 1426
		shost_printk(KERN_WARNING, target->scsi_host,
			     PFX "Got target logout request\n");
1427 1428 1429
		break;

	default:
1430 1431
		shost_printk(KERN_WARNING, target->scsi_host,
			     PFX "Unhandled SRP opcode 0x%02x\n", opcode);
1432 1433 1434
		break;
	}

1435 1436
	ib_dma_sync_single_for_device(dev, iu->dma, target->max_ti_iu_len,
				      DMA_FROM_DEVICE);
1437

1438
	res = srp_post_recv(target, iu);
1439 1440 1441
	if (res != 0)
		shost_printk(KERN_ERR, target->scsi_host,
			     PFX "Recv failed with error code %d\n", res);
1442 1443
}

1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458
/**
 * srp_tl_err_work() - handle a transport layer error
 *
 * Note: This function may get invoked before the rport has been created,
 * hence the target->rport test.
 */
static void srp_tl_err_work(struct work_struct *work)
{
	struct srp_target_port *target;

	target = container_of(work, struct srp_target_port, tl_err_work);
	if (target->rport)
		srp_start_tl_fail_timers(target->rport);
}

1459
static void srp_handle_qp_err(enum ib_wc_status wc_status, bool send_err,
1460 1461
			      struct srp_target_port *target)
{
1462
	if (target->connected && !target->qp_in_error) {
1463 1464
		shost_printk(KERN_ERR, target->scsi_host,
			     PFX "failed %s status %d\n",
1465
			     send_err ? "send" : "receive",
1466
			     wc_status);
1467
		queue_work(system_long_wq, &target->tl_err_work);
1468
	}
1469 1470 1471
	target->qp_in_error = true;
}

1472
static void srp_recv_completion(struct ib_cq *cq, void *target_ptr)
1473 1474 1475 1476 1477 1478
{
	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) {
1479 1480 1481
		if (likely(wc.status == IB_WC_SUCCESS)) {
			srp_handle_recv(target, &wc);
		} else {
1482
			srp_handle_qp_err(wc.status, false, target);
1483
		}
1484 1485 1486 1487 1488 1489 1490
	}
}

static void srp_send_completion(struct ib_cq *cq, void *target_ptr)
{
	struct srp_target_port *target = target_ptr;
	struct ib_wc wc;
1491
	struct srp_iu *iu;
1492 1493

	while (ib_poll_cq(cq, 1, &wc) > 0) {
1494 1495 1496 1497
		if (likely(wc.status == IB_WC_SUCCESS)) {
			iu = (struct srp_iu *) (uintptr_t) wc.wr_id;
			list_add(&iu->list, &target->free_tx);
		} else {
1498
			srp_handle_qp_err(wc.status, true, target);
1499
		}
1500 1501 1502
	}
}

1503
static int srp_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *scmnd)
1504
{
1505
	struct srp_target_port *target = host_to_target(shost);
1506
	struct srp_rport *rport = target->rport;
1507 1508 1509
	struct srp_request *req;
	struct srp_iu *iu;
	struct srp_cmd *cmd;
1510
	struct ib_device *dev;
1511
	unsigned long flags;
1512
	int len, result;
1513 1514 1515 1516 1517 1518 1519 1520 1521 1522
	const bool in_scsi_eh = !in_interrupt() && current == shost->ehandler;

	/*
	 * The SCSI EH thread is the only context from which srp_queuecommand()
	 * can get invoked for blocked devices (SDEV_BLOCK /
	 * SDEV_CREATED_BLOCK). Avoid racing with srp_reconnect_rport() by
	 * locking the rport mutex if invoked from inside the SCSI EH.
	 */
	if (in_scsi_eh)
		mutex_lock(&rport->mutex);
1523

1524 1525 1526
	result = srp_chkready(target->rport);
	if (unlikely(result)) {
		scmnd->result = result;
1527
		scmnd->scsi_done(scmnd);
1528
		goto unlock_rport;
1529 1530
	}

1531
	spin_lock_irqsave(&target->lock, flags);
1532
	iu = __srp_get_tx_iu(target, SRP_IU_CMD);
1533
	if (!iu)
1534 1535 1536 1537 1538
		goto err_unlock;

	req = list_first_entry(&target->free_reqs, struct srp_request, list);
	list_del(&req->list);
	spin_unlock_irqrestore(&target->lock, flags);
1539

1540
	dev = target->srp_host->srp_dev->dev;
1541
	ib_dma_sync_single_for_cpu(dev, iu->dma, target->max_iu_len,
1542
				   DMA_TO_DEVICE);
1543 1544

	scmnd->result        = 0;
1545
	scmnd->host_scribble = (void *) req;
1546 1547 1548 1549 1550 1551

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

	cmd->opcode = SRP_CMD;
	cmd->lun    = cpu_to_be64((u64) scmnd->device->lun << 48);
1552
	cmd->tag    = req->index;
1553 1554 1555 1556 1557 1558 1559
	memcpy(cmd->cdb, scmnd->cmnd, scmnd->cmd_len);

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

	len = srp_map_data(scmnd, target, req);
	if (len < 0) {
1560 1561
		shost_printk(KERN_ERR, target->scsi_host,
			     PFX "Failed to map data\n");
1562
		goto err_iu;
1563 1564
	}

1565
	ib_dma_sync_single_for_device(dev, iu->dma, target->max_iu_len,
1566
				      DMA_TO_DEVICE);
1567

1568
	if (srp_post_send(target, iu, len)) {
1569
		shost_printk(KERN_ERR, target->scsi_host, PFX "Send failed\n");
1570 1571 1572
		goto err_unmap;
	}

1573 1574 1575 1576
unlock_rport:
	if (in_scsi_eh)
		mutex_unlock(&rport->mutex);

1577 1578 1579 1580 1581
	return 0;

err_unmap:
	srp_unmap_data(scmnd, target, req);

1582 1583 1584
err_iu:
	srp_put_tx_iu(target, iu, SRP_IU_CMD);

1585
	spin_lock_irqsave(&target->lock, flags);
1586
	list_add(&req->list, &target->free_reqs);
1587 1588

err_unlock:
1589
	spin_unlock_irqrestore(&target->lock, flags);
1590

1591 1592 1593
	if (in_scsi_eh)
		mutex_unlock(&rport->mutex);

1594 1595 1596
	return SCSI_MLQUEUE_HOST_BUSY;
}

1597 1598 1599 1600
/*
 * Note: the resources allocated in this function are freed in
 * srp_free_target_ib().
 */
1601 1602 1603 1604
static int srp_alloc_iu_bufs(struct srp_target_port *target)
{
	int i;

1605 1606 1607 1608 1609 1610 1611 1612 1613 1614
	target->rx_ring = kzalloc(target->queue_size * sizeof(*target->rx_ring),
				  GFP_KERNEL);
	if (!target->rx_ring)
		goto err_no_ring;
	target->tx_ring = kzalloc(target->queue_size * sizeof(*target->tx_ring),
				  GFP_KERNEL);
	if (!target->tx_ring)
		goto err_no_ring;

	for (i = 0; i < target->queue_size; ++i) {
1615 1616 1617 1618 1619 1620 1621
		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;
	}

1622
	for (i = 0; i < target->queue_size; ++i) {
1623
		target->tx_ring[i] = srp_alloc_iu(target->srp_host,
1624
						  target->max_iu_len,
1625 1626 1627
						  GFP_KERNEL, DMA_TO_DEVICE);
		if (!target->tx_ring[i])
			goto err;
1628 1629

		list_add(&target->tx_ring[i]->list, &target->free_tx);
1630 1631 1632 1633 1634
	}

	return 0;

err:
1635
	for (i = 0; i < target->queue_size; ++i) {
1636 1637 1638 1639
		srp_free_iu(target->srp_host, target->rx_ring[i]);
		srp_free_iu(target->srp_host, target->tx_ring[i]);
	}

1640 1641 1642 1643 1644 1645 1646

err_no_ring:
	kfree(target->tx_ring);
	target->tx_ring = NULL;
	kfree(target->rx_ring);
	target->rx_ring = NULL;

1647 1648 1649
	return -ENOMEM;
}

1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676
static uint32_t srp_compute_rq_tmo(struct ib_qp_attr *qp_attr, int attr_mask)
{
	uint64_t T_tr_ns, max_compl_time_ms;
	uint32_t rq_tmo_jiffies;

	/*
	 * According to section 11.2.4.2 in the IBTA spec (Modify Queue Pair,
	 * table 91), both the QP timeout and the retry count have to be set
	 * for RC QP's during the RTR to RTS transition.
	 */
	WARN_ON_ONCE((attr_mask & (IB_QP_TIMEOUT | IB_QP_RETRY_CNT)) !=
		     (IB_QP_TIMEOUT | IB_QP_RETRY_CNT));

	/*
	 * Set target->rq_tmo_jiffies to one second more than the largest time
	 * it can take before an error completion is generated. See also
	 * C9-140..142 in the IBTA spec for more information about how to
	 * convert the QP Local ACK Timeout value to nanoseconds.
	 */
	T_tr_ns = 4096 * (1ULL << qp_attr->timeout);
	max_compl_time_ms = qp_attr->retry_cnt * 4 * T_tr_ns;
	do_div(max_compl_time_ms, NSEC_PER_MSEC);
	rq_tmo_jiffies = msecs_to_jiffies(max_compl_time_ms + 1000);

	return rq_tmo_jiffies;
}

1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696
static void srp_cm_rep_handler(struct ib_cm_id *cm_id,
			       struct srp_login_rsp *lrsp,
			       struct srp_target_port *target)
{
	struct ib_qp_attr *qp_attr = NULL;
	int attr_mask = 0;
	int ret;
	int i;

	if (lrsp->opcode == SRP_LOGIN_RSP) {
		target->max_ti_iu_len = be32_to_cpu(lrsp->max_ti_iu_len);
		target->req_lim       = be32_to_cpu(lrsp->req_lim_delta);

		/*
		 * Reserve credits for task management so we don't
		 * bounce requests back to the SCSI mid-layer.
		 */
		target->scsi_host->can_queue
			= min(target->req_lim - SRP_TSK_MGMT_SQ_SIZE,
			      target->scsi_host->can_queue);
1697 1698 1699
		target->scsi_host->cmd_per_lun
			= min_t(int, target->scsi_host->can_queue,
				target->scsi_host->cmd_per_lun);
1700 1701 1702 1703 1704 1705 1706
	} else {
		shost_printk(KERN_WARNING, target->scsi_host,
			     PFX "Unhandled RSP opcode %#x\n", lrsp->opcode);
		ret = -ECONNRESET;
		goto error;
	}

1707
	if (!target->rx_ring) {
1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726
		ret = srp_alloc_iu_bufs(target);
		if (ret)
			goto error;
	}

	ret = -ENOMEM;
	qp_attr = kmalloc(sizeof *qp_attr, GFP_KERNEL);
	if (!qp_attr)
		goto error;

	qp_attr->qp_state = IB_QPS_RTR;
	ret = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
	if (ret)
		goto error_free;

	ret = ib_modify_qp(target->qp, qp_attr, attr_mask);
	if (ret)
		goto error_free;

1727
	for (i = 0; i < target->queue_size; i++) {
1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738
		struct srp_iu *iu = target->rx_ring[i];
		ret = srp_post_recv(target, iu);
		if (ret)
			goto error_free;
	}

	qp_attr->qp_state = IB_QPS_RTS;
	ret = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
	if (ret)
		goto error_free;

1739 1740
	target->rq_tmo_jiffies = srp_compute_rq_tmo(qp_attr, attr_mask);

1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753
	ret = ib_modify_qp(target->qp, qp_attr, attr_mask);
	if (ret)
		goto error_free;

	ret = ib_send_cm_rtu(cm_id, NULL, 0);

error_free:
	kfree(qp_attr);

error:
	target->status = ret;
}

1754 1755 1756 1757
static void srp_cm_rej_handler(struct ib_cm_id *cm_id,
			       struct ib_cm_event *event,
			       struct srp_target_port *target)
{
1758
	struct Scsi_Host *shost = target->scsi_host;
1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774
	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:
1775
		if (srp_target_is_topspin(target)) {
1776 1777 1778 1779 1780 1781 1782 1783
			/*
			 * 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);

1784 1785 1786 1787
			shost_printk(KERN_DEBUG, shost,
				     PFX "Topspin/Cisco redirect to target port GID %016llx%016llx\n",
				     (unsigned long long) be64_to_cpu(target->path.dgid.global.subnet_prefix),
				     (unsigned long long) be64_to_cpu(target->path.dgid.global.interface_id));
1788 1789 1790

			target->status = SRP_PORT_REDIRECT;
		} else {
1791 1792
			shost_printk(KERN_WARNING, shost,
				     "  REJ reason: IB_CM_REJ_PORT_REDIRECT\n");
1793 1794 1795 1796 1797
			target->status = -ECONNRESET;
		}
		break;

	case IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID:
1798 1799
		shost_printk(KERN_WARNING, shost,
			    "  REJ reason: IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID\n");
1800 1801 1802 1803 1804 1805 1806 1807 1808 1809
		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)
1810 1811
				shost_printk(KERN_WARNING, shost,
					     PFX "SRP_LOGIN_REJ: requested max_it_iu_len too large\n");
1812
			else
B
Bart Van Assche 已提交
1813 1814 1815 1816
				shost_printk(KERN_WARNING, shost, PFX
					     "SRP LOGIN from %pI6 to %pI6 REJECTED, reason 0x%08x\n",
					     target->path.sgid.raw,
					     target->orig_dgid, reason);
1817
		} else
1818 1819 1820
			shost_printk(KERN_WARNING, shost,
				     "  REJ reason: IB_CM_REJ_CONSUMER_DEFINED,"
				     " opcode 0x%02x\n", opcode);
1821 1822 1823
		target->status = -ECONNRESET;
		break;

D
David Dillow 已提交
1824 1825 1826 1827 1828
	case IB_CM_REJ_STALE_CONN:
		shost_printk(KERN_WARNING, shost, "  REJ reason: stale connection\n");
		target->status = SRP_STALE_CONN;
		break;

1829
	default:
1830 1831
		shost_printk(KERN_WARNING, shost, "  REJ reason 0x%x\n",
			     event->param.rej_rcvd.reason);
1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842
		target->status = -ECONNRESET;
	}
}

static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
{
	struct srp_target_port *target = cm_id->context;
	int comp = 0;

	switch (event->event) {
	case IB_CM_REQ_ERROR:
1843 1844
		shost_printk(KERN_DEBUG, target->scsi_host,
			     PFX "Sending CM REQ failed\n");
1845 1846 1847 1848 1849 1850
		comp = 1;
		target->status = -ECONNRESET;
		break;

	case IB_CM_REP_RECEIVED:
		comp = 1;
1851
		srp_cm_rep_handler(cm_id, event->private_data, target);
1852 1853 1854
		break;

	case IB_CM_REJ_RECEIVED:
1855
		shost_printk(KERN_DEBUG, target->scsi_host, PFX "REJ received\n");
1856 1857 1858 1859 1860
		comp = 1;

		srp_cm_rej_handler(cm_id, event, target);
		break;

1861
	case IB_CM_DREQ_RECEIVED:
1862 1863
		shost_printk(KERN_WARNING, target->scsi_host,
			     PFX "DREQ received - connection closed\n");
1864
		srp_change_conn_state(target, false);
1865
		if (ib_send_cm_drep(cm_id, NULL, 0))
1866 1867
			shost_printk(KERN_ERR, target->scsi_host,
				     PFX "Sending CM DREP failed\n");
1868
		queue_work(system_long_wq, &target->tl_err_work);
1869 1870 1871
		break;

	case IB_CM_TIMEWAIT_EXIT:
1872 1873
		shost_printk(KERN_ERR, target->scsi_host,
			     PFX "connection closed\n");
1874
		comp = 1;
1875 1876 1877 1878

		target->status = 0;
		break;

1879 1880 1881 1882 1883
	case IB_CM_MRA_RECEIVED:
	case IB_CM_DREQ_ERROR:
	case IB_CM_DREP_RECEIVED:
		break;

1884
	default:
1885 1886
		shost_printk(KERN_WARNING, target->scsi_host,
			     PFX "Unhandled CM event %d\n", event->event);
1887 1888 1889 1890 1891 1892 1893 1894 1895
		break;
	}

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

	return 0;
}

1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946
/**
 * srp_change_queue_type - changing device queue tag type
 * @sdev: scsi device struct
 * @tag_type: requested tag type
 *
 * Returns queue tag type.
 */
static int
srp_change_queue_type(struct scsi_device *sdev, int tag_type)
{
	if (sdev->tagged_supported) {
		scsi_set_tag_type(sdev, tag_type);
		if (tag_type)
			scsi_activate_tcq(sdev, sdev->queue_depth);
		else
			scsi_deactivate_tcq(sdev, sdev->queue_depth);
	} else
		tag_type = 0;

	return tag_type;
}

/**
 * srp_change_queue_depth - setting device queue depth
 * @sdev: scsi device struct
 * @qdepth: requested queue depth
 * @reason: SCSI_QDEPTH_DEFAULT/SCSI_QDEPTH_QFULL/SCSI_QDEPTH_RAMP_UP
 * (see include/scsi/scsi_host.h for definition)
 *
 * Returns queue depth.
 */
static int
srp_change_queue_depth(struct scsi_device *sdev, int qdepth, int reason)
{
	struct Scsi_Host *shost = sdev->host;
	int max_depth;
	if (reason == SCSI_QDEPTH_DEFAULT || reason == SCSI_QDEPTH_RAMP_UP) {
		max_depth = shost->can_queue;
		if (!sdev->tagged_supported)
			max_depth = 1;
		if (qdepth > max_depth)
			qdepth = max_depth;
		scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), qdepth);
	} else if (reason == SCSI_QDEPTH_QFULL)
		scsi_track_queue_full(sdev, qdepth);
	else
		return -EOPNOTSUPP;

	return sdev->queue_depth;
}

1947
static int srp_send_tsk_mgmt(struct srp_target_port *target,
1948
			     u64 req_tag, unsigned int lun, u8 func)
1949
{
1950
	struct srp_rport *rport = target->rport;
1951
	struct ib_device *dev = target->srp_host->srp_dev->dev;
1952 1953 1954
	struct srp_iu *iu;
	struct srp_tsk_mgmt *tsk_mgmt;

1955 1956 1957
	if (!target->connected || target->qp_in_error)
		return -1;

1958
	init_completion(&target->tsk_mgmt_done);
1959

1960 1961 1962 1963 1964
	/*
	 * Lock the rport mutex to avoid that srp_create_target_ib() is
	 * invoked while a task management function is being sent.
	 */
	mutex_lock(&rport->mutex);
1965
	spin_lock_irq(&target->lock);
1966
	iu = __srp_get_tx_iu(target, SRP_IU_TSK_MGMT);
1967
	spin_unlock_irq(&target->lock);
1968

1969 1970 1971
	if (!iu) {
		mutex_unlock(&rport->mutex);

1972
		return -1;
1973
	}
1974

1975 1976
	ib_dma_sync_single_for_cpu(dev, iu->dma, sizeof *tsk_mgmt,
				   DMA_TO_DEVICE);
1977 1978 1979 1980
	tsk_mgmt = iu->buf;
	memset(tsk_mgmt, 0, sizeof *tsk_mgmt);

	tsk_mgmt->opcode 	= SRP_TSK_MGMT;
1981 1982
	tsk_mgmt->lun		= cpu_to_be64((u64) lun << 48);
	tsk_mgmt->tag		= req_tag | SRP_TAG_TSK_MGMT;
1983
	tsk_mgmt->tsk_mgmt_func = func;
1984
	tsk_mgmt->task_tag	= req_tag;
1985

1986 1987
	ib_dma_sync_single_for_device(dev, iu->dma, sizeof *tsk_mgmt,
				      DMA_TO_DEVICE);
1988 1989
	if (srp_post_send(target, iu, sizeof *tsk_mgmt)) {
		srp_put_tx_iu(target, iu, SRP_IU_TSK_MGMT);
1990 1991
		mutex_unlock(&rport->mutex);

1992 1993
		return -1;
	}
1994
	mutex_unlock(&rport->mutex);
1995

1996
	if (!wait_for_completion_timeout(&target->tsk_mgmt_done,
1997
					 msecs_to_jiffies(SRP_ABORT_TIMEOUT_MS)))
1998
		return -1;
1999

2000 2001 2002
	return 0;
}

2003 2004
static int srp_abort(struct scsi_cmnd *scmnd)
{
2005
	struct srp_target_port *target = host_to_target(scmnd->device->host);
2006
	struct srp_request *req = (struct srp_request *) scmnd->host_scribble;
2007
	int ret;
2008

2009
	shost_printk(KERN_ERR, target->scsi_host, "SRP abort called\n");
2010

2011
	if (!req || !srp_claim_req(target, req, scmnd))
2012
		return SUCCESS;
2013
	if (srp_send_tsk_mgmt(target, req->index, scmnd->device->lun,
2014
			      SRP_TSK_ABORT_TASK) == 0)
2015
		ret = SUCCESS;
2016
	else if (target->rport->state == SRP_RPORT_LOST)
2017
		ret = FAST_IO_FAIL;
2018 2019
	else
		ret = FAILED;
B
Bart Van Assche 已提交
2020 2021
	srp_free_req(target, req, scmnd, 0);
	scmnd->result = DID_ABORT << 16;
2022
	scmnd->scsi_done(scmnd);
2023

2024
	return ret;
2025 2026 2027 2028
}

static int srp_reset_device(struct scsi_cmnd *scmnd)
{
2029
	struct srp_target_port *target = host_to_target(scmnd->device->host);
2030
	int i;
2031

2032
	shost_printk(KERN_ERR, target->scsi_host, "SRP reset_device called\n");
2033

2034 2035
	if (srp_send_tsk_mgmt(target, SRP_TAG_NO_REQ, scmnd->device->lun,
			      SRP_TSK_LUN_RESET))
2036
		return FAILED;
2037
	if (target->tsk_mgmt_status)
2038 2039
		return FAILED;

2040
	for (i = 0; i < target->req_ring_size; ++i) {
2041
		struct srp_request *req = &target->req_ring[i];
2042
		if (req->scmnd && req->scmnd->device == scmnd->device)
2043
			srp_finish_req(target, req, DID_RESET << 16);
2044
	}
2045 2046

	return SUCCESS;
2047 2048 2049 2050 2051 2052
}

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

2053
	shost_printk(KERN_ERR, target->scsi_host, PFX "SRP reset_host called\n");
2054

2055
	return srp_reconnect_rport(target->rport) == 0 ? SUCCESS : FAILED;
2056 2057
}

2058 2059 2060 2061 2062 2063 2064 2065 2066 2067 2068 2069 2070 2071 2072
static int srp_slave_configure(struct scsi_device *sdev)
{
	struct Scsi_Host *shost = sdev->host;
	struct srp_target_port *target = host_to_target(shost);
	struct request_queue *q = sdev->request_queue;
	unsigned long timeout;

	if (sdev->type == TYPE_DISK) {
		timeout = max_t(unsigned, 30 * HZ, target->rq_tmo_jiffies);
		blk_queue_rq_timeout(q, timeout);
	}

	return 0;
}

2073 2074
static ssize_t show_id_ext(struct device *dev, struct device_attribute *attr,
			   char *buf)
2075
{
2076
	struct srp_target_port *target = host_to_target(class_to_shost(dev));
2077 2078 2079 2080 2081

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

2082 2083
static ssize_t show_ioc_guid(struct device *dev, struct device_attribute *attr,
			     char *buf)
2084
{
2085
	struct srp_target_port *target = host_to_target(class_to_shost(dev));
2086 2087 2088 2089 2090

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

2091 2092
static ssize_t show_service_id(struct device *dev,
			       struct device_attribute *attr, char *buf)
2093
{
2094
	struct srp_target_port *target = host_to_target(class_to_shost(dev));
2095 2096 2097 2098 2099

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

2100 2101
static ssize_t show_pkey(struct device *dev, struct device_attribute *attr,
			 char *buf)
2102
{
2103
	struct srp_target_port *target = host_to_target(class_to_shost(dev));
2104 2105 2106 2107

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

B
Bart Van Assche 已提交
2108 2109 2110 2111 2112 2113 2114 2115
static ssize_t show_sgid(struct device *dev, struct device_attribute *attr,
			 char *buf)
{
	struct srp_target_port *target = host_to_target(class_to_shost(dev));

	return sprintf(buf, "%pI6\n", target->path.sgid.raw);
}

2116 2117
static ssize_t show_dgid(struct device *dev, struct device_attribute *attr,
			 char *buf)
2118
{
2119
	struct srp_target_port *target = host_to_target(class_to_shost(dev));
2120

H
Harvey Harrison 已提交
2121
	return sprintf(buf, "%pI6\n", target->path.dgid.raw);
2122 2123
}

2124 2125
static ssize_t show_orig_dgid(struct device *dev,
			      struct device_attribute *attr, char *buf)
2126
{
2127
	struct srp_target_port *target = host_to_target(class_to_shost(dev));
2128

H
Harvey Harrison 已提交
2129
	return sprintf(buf, "%pI6\n", target->orig_dgid);
2130 2131
}

2132 2133 2134 2135 2136 2137 2138 2139
static ssize_t show_req_lim(struct device *dev,
			    struct device_attribute *attr, char *buf)
{
	struct srp_target_port *target = host_to_target(class_to_shost(dev));

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

2140 2141
static ssize_t show_zero_req_lim(struct device *dev,
				 struct device_attribute *attr, char *buf)
2142
{
2143
	struct srp_target_port *target = host_to_target(class_to_shost(dev));
2144 2145 2146 2147

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

2148 2149
static ssize_t show_local_ib_port(struct device *dev,
				  struct device_attribute *attr, char *buf)
2150
{
2151
	struct srp_target_port *target = host_to_target(class_to_shost(dev));
2152 2153 2154 2155

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

2156 2157
static ssize_t show_local_ib_device(struct device *dev,
				    struct device_attribute *attr, char *buf)
2158
{
2159
	struct srp_target_port *target = host_to_target(class_to_shost(dev));
2160

2161
	return sprintf(buf, "%s\n", target->srp_host->srp_dev->dev->name);
2162 2163
}

2164 2165 2166 2167 2168 2169 2170 2171
static ssize_t show_comp_vector(struct device *dev,
				struct device_attribute *attr, char *buf)
{
	struct srp_target_port *target = host_to_target(class_to_shost(dev));

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

2172 2173 2174 2175 2176 2177 2178 2179
static ssize_t show_tl_retry_count(struct device *dev,
				   struct device_attribute *attr, char *buf)
{
	struct srp_target_port *target = host_to_target(class_to_shost(dev));

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

2180 2181 2182 2183 2184 2185 2186 2187
static ssize_t show_cmd_sg_entries(struct device *dev,
				   struct device_attribute *attr, char *buf)
{
	struct srp_target_port *target = host_to_target(class_to_shost(dev));

	return sprintf(buf, "%u\n", target->cmd_sg_cnt);
}

2188 2189 2190 2191 2192 2193 2194 2195
static ssize_t show_allow_ext_sg(struct device *dev,
				 struct device_attribute *attr, char *buf)
{
	struct srp_target_port *target = host_to_target(class_to_shost(dev));

	return sprintf(buf, "%s\n", target->allow_ext_sg ? "true" : "false");
}

2196 2197 2198 2199
static DEVICE_ATTR(id_ext,	    S_IRUGO, show_id_ext,	   NULL);
static DEVICE_ATTR(ioc_guid,	    S_IRUGO, show_ioc_guid,	   NULL);
static DEVICE_ATTR(service_id,	    S_IRUGO, show_service_id,	   NULL);
static DEVICE_ATTR(pkey,	    S_IRUGO, show_pkey,		   NULL);
B
Bart Van Assche 已提交
2200
static DEVICE_ATTR(sgid,	    S_IRUGO, show_sgid,		   NULL);
2201 2202
static DEVICE_ATTR(dgid,	    S_IRUGO, show_dgid,		   NULL);
static DEVICE_ATTR(orig_dgid,	    S_IRUGO, show_orig_dgid,	   NULL);
2203
static DEVICE_ATTR(req_lim,         S_IRUGO, show_req_lim,         NULL);
2204 2205 2206
static DEVICE_ATTR(zero_req_lim,    S_IRUGO, show_zero_req_lim,	   NULL);
static DEVICE_ATTR(local_ib_port,   S_IRUGO, show_local_ib_port,   NULL);
static DEVICE_ATTR(local_ib_device, S_IRUGO, show_local_ib_device, NULL);
2207
static DEVICE_ATTR(comp_vector,     S_IRUGO, show_comp_vector,     NULL);
2208
static DEVICE_ATTR(tl_retry_count,  S_IRUGO, show_tl_retry_count,  NULL);
2209
static DEVICE_ATTR(cmd_sg_entries,  S_IRUGO, show_cmd_sg_entries,  NULL);
2210
static DEVICE_ATTR(allow_ext_sg,    S_IRUGO, show_allow_ext_sg,    NULL);
2211 2212 2213 2214 2215 2216

static struct device_attribute *srp_host_attrs[] = {
	&dev_attr_id_ext,
	&dev_attr_ioc_guid,
	&dev_attr_service_id,
	&dev_attr_pkey,
B
Bart Van Assche 已提交
2217
	&dev_attr_sgid,
2218 2219
	&dev_attr_dgid,
	&dev_attr_orig_dgid,
2220
	&dev_attr_req_lim,
2221 2222 2223
	&dev_attr_zero_req_lim,
	&dev_attr_local_ib_port,
	&dev_attr_local_ib_device,
2224
	&dev_attr_comp_vector,
2225
	&dev_attr_tl_retry_count,
2226
	&dev_attr_cmd_sg_entries,
2227
	&dev_attr_allow_ext_sg,
2228 2229 2230
	NULL
};

2231 2232
static struct scsi_host_template srp_template = {
	.module				= THIS_MODULE,
R
Roland Dreier 已提交
2233 2234
	.name				= "InfiniBand SRP initiator",
	.proc_name			= DRV_NAME,
2235
	.slave_configure		= srp_slave_configure,
2236 2237
	.info				= srp_target_info,
	.queuecommand			= srp_queuecommand,
2238 2239
	.change_queue_depth             = srp_change_queue_depth,
	.change_queue_type              = srp_change_queue_type,
2240 2241 2242
	.eh_abort_handler		= srp_abort,
	.eh_device_reset_handler	= srp_reset_device,
	.eh_host_reset_handler		= srp_reset_host,
B
Bart Van Assche 已提交
2243
	.skip_settle_delay		= true,
2244
	.sg_tablesize			= SRP_DEF_SG_TABLESIZE,
2245
	.can_queue			= SRP_DEFAULT_CMD_SQ_SIZE,
2246
	.this_id			= -1,
2247
	.cmd_per_lun			= SRP_DEFAULT_CMD_SQ_SIZE,
2248 2249
	.use_clustering			= ENABLE_CLUSTERING,
	.shost_attrs			= srp_host_attrs
2250 2251 2252 2253
};

static int srp_add_target(struct srp_host *host, struct srp_target_port *target)
{
2254 2255 2256
	struct srp_rport_identifiers ids;
	struct srp_rport *rport;

2257 2258 2259
	sprintf(target->target_name, "SRP.T10:%016llX",
		 (unsigned long long) be64_to_cpu(target->id_ext));

2260
	if (scsi_add_host(target->scsi_host, host->srp_dev->dev->dma_device))
2261 2262
		return -ENODEV;

2263 2264
	memcpy(ids.port_id, &target->id_ext, 8);
	memcpy(ids.port_id + 8, &target->ioc_guid, 8);
2265
	ids.roles = SRP_RPORT_ROLE_TARGET;
2266 2267 2268 2269 2270 2271
	rport = srp_rport_add(target->scsi_host, &ids);
	if (IS_ERR(rport)) {
		scsi_remove_host(target->scsi_host);
		return PTR_ERR(rport);
	}

2272
	rport->lld_data = target;
2273
	target->rport = rport;
2274

2275
	spin_lock(&host->target_lock);
2276
	list_add_tail(&target->list, &host->target_list);
2277
	spin_unlock(&host->target_lock);
2278 2279 2280 2281

	target->state = SRP_TARGET_LIVE;

	scsi_scan_target(&target->scsi_host->shost_gendev,
2282
			 0, target->scsi_id, SCAN_WILD_CARD, 0);
2283 2284 2285 2286

	return 0;
}

2287
static void srp_release_dev(struct device *dev)
2288 2289
{
	struct srp_host *host =
2290
		container_of(dev, struct srp_host, dev);
2291 2292 2293 2294 2295 2296

	complete(&host->released);
}

static struct class srp_class = {
	.name    = "infiniband_srp",
2297
	.dev_release = srp_release_dev
2298 2299
};

2300 2301 2302 2303 2304 2305 2306 2307 2308 2309 2310 2311 2312 2313 2314 2315 2316 2317 2318 2319 2320 2321 2322 2323 2324 2325 2326 2327 2328 2329
/**
 * srp_conn_unique() - check whether the connection to a target is unique
 */
static bool srp_conn_unique(struct srp_host *host,
			    struct srp_target_port *target)
{
	struct srp_target_port *t;
	bool ret = false;

	if (target->state == SRP_TARGET_REMOVED)
		goto out;

	ret = true;

	spin_lock(&host->target_lock);
	list_for_each_entry(t, &host->target_list, list) {
		if (t != target &&
		    target->id_ext == t->id_ext &&
		    target->ioc_guid == t->ioc_guid &&
		    target->initiator_ext == t->initiator_ext) {
			ret = false;
			break;
		}
	}
	spin_unlock(&host->target_lock);

out:
	return ret;
}

2330 2331 2332 2333 2334 2335 2336 2337 2338 2339 2340 2341 2342 2343 2344 2345
/*
 * 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,
2346
	SRP_OPT_MAX_CMD_PER_LUN	= 1 << 6,
2347
	SRP_OPT_IO_CLASS	= 1 << 7,
2348
	SRP_OPT_INITIATOR_EXT	= 1 << 8,
2349
	SRP_OPT_CMD_SG_ENTRIES	= 1 << 9,
2350 2351
	SRP_OPT_ALLOW_EXT_SG	= 1 << 10,
	SRP_OPT_SG_TABLESIZE	= 1 << 11,
2352
	SRP_OPT_COMP_VECTOR	= 1 << 12,
2353
	SRP_OPT_TL_RETRY_COUNT	= 1 << 13,
2354
	SRP_OPT_QUEUE_SIZE	= 1 << 14,
2355 2356 2357 2358 2359 2360 2361
	SRP_OPT_ALL		= (SRP_OPT_ID_EXT	|
				   SRP_OPT_IOC_GUID	|
				   SRP_OPT_DGID		|
				   SRP_OPT_PKEY		|
				   SRP_OPT_SERVICE_ID),
};

2362
static const match_table_t srp_opt_tokens = {
2363 2364 2365 2366 2367 2368 2369
	{ 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" 	},
2370
	{ SRP_OPT_IO_CLASS,		"io_class=%x"		},
2371
	{ SRP_OPT_INITIATOR_EXT,	"initiator_ext=%s"	},
2372
	{ SRP_OPT_CMD_SG_ENTRIES,	"cmd_sg_entries=%u"	},
2373 2374
	{ SRP_OPT_ALLOW_EXT_SG,		"allow_ext_sg=%u"	},
	{ SRP_OPT_SG_TABLESIZE,		"sg_tablesize=%u"	},
2375
	{ SRP_OPT_COMP_VECTOR,		"comp_vector=%u"	},
2376
	{ SRP_OPT_TL_RETRY_COUNT,	"tl_retry_count=%u"	},
2377
	{ SRP_OPT_QUEUE_SIZE,		"queue_size=%d"		},
2378
	{ SRP_OPT_ERR,			NULL 			}
2379 2380 2381 2382 2383 2384 2385 2386 2387 2388 2389 2390 2391 2392 2393 2394 2395 2396 2397 2398 2399 2400 2401 2402 2403 2404 2405 2406
};

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);
2407 2408 2409 2410
			if (!p) {
				ret = -ENOMEM;
				goto out;
			}
2411 2412 2413 2414 2415 2416
			target->id_ext = cpu_to_be64(simple_strtoull(p, NULL, 16));
			kfree(p);
			break;

		case SRP_OPT_IOC_GUID:
			p = match_strdup(args);
2417 2418 2419 2420
			if (!p) {
				ret = -ENOMEM;
				goto out;
			}
2421 2422 2423 2424 2425 2426
			target->ioc_guid = cpu_to_be64(simple_strtoull(p, NULL, 16));
			kfree(p);
			break;

		case SRP_OPT_DGID:
			p = match_strdup(args);
2427 2428 2429 2430
			if (!p) {
				ret = -ENOMEM;
				goto out;
			}
2431
			if (strlen(p) != 32) {
2432
				pr_warn("bad dest GID parameter '%s'\n", p);
2433
				kfree(p);
2434 2435 2436 2437 2438 2439 2440
				goto out;
			}

			for (i = 0; i < 16; ++i) {
				strlcpy(dgid, p + i * 2, 3);
				target->path.dgid.raw[i] = simple_strtoul(dgid, NULL, 16);
			}
2441
			kfree(p);
2442
			memcpy(target->orig_dgid, target->path.dgid.raw, 16);
2443 2444 2445 2446
			break;

		case SRP_OPT_PKEY:
			if (match_hex(args, &token)) {
2447
				pr_warn("bad P_Key parameter '%s'\n", p);
2448 2449 2450 2451 2452 2453 2454
				goto out;
			}
			target->path.pkey = cpu_to_be16(token);
			break;

		case SRP_OPT_SERVICE_ID:
			p = match_strdup(args);
2455 2456 2457 2458
			if (!p) {
				ret = -ENOMEM;
				goto out;
			}
2459
			target->service_id = cpu_to_be64(simple_strtoull(p, NULL, 16));
2460
			target->path.service_id = target->service_id;
2461 2462 2463 2464 2465
			kfree(p);
			break;

		case SRP_OPT_MAX_SECT:
			if (match_int(args, &token)) {
2466
				pr_warn("bad max sect parameter '%s'\n", p);
2467 2468 2469 2470 2471
				goto out;
			}
			target->scsi_host->max_sectors = token;
			break;

2472 2473 2474 2475 2476 2477 2478 2479 2480 2481 2482 2483
		case SRP_OPT_QUEUE_SIZE:
			if (match_int(args, &token) || token < 1) {
				pr_warn("bad queue_size parameter '%s'\n", p);
				goto out;
			}
			target->scsi_host->can_queue = token;
			target->queue_size = token + SRP_RSP_SQ_SIZE +
					     SRP_TSK_MGMT_SQ_SIZE;
			if (!(opt_mask & SRP_OPT_MAX_CMD_PER_LUN))
				target->scsi_host->cmd_per_lun = token;
			break;

2484
		case SRP_OPT_MAX_CMD_PER_LUN:
2485
			if (match_int(args, &token) || token < 1) {
2486 2487
				pr_warn("bad max cmd_per_lun parameter '%s'\n",
					p);
2488 2489
				goto out;
			}
2490
			target->scsi_host->cmd_per_lun = token;
2491 2492
			break;

2493 2494
		case SRP_OPT_IO_CLASS:
			if (match_hex(args, &token)) {
2495
				pr_warn("bad IO class parameter '%s'\n", p);
2496 2497 2498 2499
				goto out;
			}
			if (token != SRP_REV10_IB_IO_CLASS &&
			    token != SRP_REV16A_IB_IO_CLASS) {
2500 2501 2502
				pr_warn("unknown IO class parameter value %x specified (use %x or %x).\n",
					token, SRP_REV10_IB_IO_CLASS,
					SRP_REV16A_IB_IO_CLASS);
2503 2504 2505 2506 2507
				goto out;
			}
			target->io_class = token;
			break;

2508 2509
		case SRP_OPT_INITIATOR_EXT:
			p = match_strdup(args);
2510 2511 2512 2513
			if (!p) {
				ret = -ENOMEM;
				goto out;
			}
2514 2515 2516 2517
			target->initiator_ext = cpu_to_be64(simple_strtoull(p, NULL, 16));
			kfree(p);
			break;

2518 2519
		case SRP_OPT_CMD_SG_ENTRIES:
			if (match_int(args, &token) || token < 1 || token > 255) {
2520 2521
				pr_warn("bad max cmd_sg_entries parameter '%s'\n",
					p);
2522 2523 2524 2525 2526
				goto out;
			}
			target->cmd_sg_cnt = token;
			break;

2527 2528
		case SRP_OPT_ALLOW_EXT_SG:
			if (match_int(args, &token)) {
2529
				pr_warn("bad allow_ext_sg parameter '%s'\n", p);
2530 2531 2532 2533 2534 2535 2536 2537
				goto out;
			}
			target->allow_ext_sg = !!token;
			break;

		case SRP_OPT_SG_TABLESIZE:
			if (match_int(args, &token) || token < 1 ||
					token > SCSI_MAX_SG_CHAIN_SEGMENTS) {
2538 2539
				pr_warn("bad max sg_tablesize parameter '%s'\n",
					p);
2540 2541 2542 2543 2544
				goto out;
			}
			target->sg_tablesize = token;
			break;

2545 2546 2547 2548 2549 2550 2551 2552
		case SRP_OPT_COMP_VECTOR:
			if (match_int(args, &token) || token < 0) {
				pr_warn("bad comp_vector parameter '%s'\n", p);
				goto out;
			}
			target->comp_vector = token;
			break;

2553 2554 2555 2556 2557 2558 2559 2560 2561
		case SRP_OPT_TL_RETRY_COUNT:
			if (match_int(args, &token) || token < 2 || token > 7) {
				pr_warn("bad tl_retry_count parameter '%s' (must be a number between 2 and 7)\n",
					p);
				goto out;
			}
			target->tl_retry_count = token;
			break;

2562
		default:
2563 2564
			pr_warn("unknown parameter or missing value '%s' in target creation request\n",
				p);
2565 2566 2567 2568 2569 2570 2571 2572 2573 2574
			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))
2575 2576
				pr_warn("target creation request is missing parameter '%s'\n",
					srp_opt_tokens[i].pattern);
2577

2578 2579 2580 2581 2582 2583
	if (target->scsi_host->cmd_per_lun > target->scsi_host->can_queue
	    && (opt_mask & SRP_OPT_MAX_CMD_PER_LUN))
		pr_warn("cmd_per_lun = %d > queue_size = %d\n",
			target->scsi_host->cmd_per_lun,
			target->scsi_host->can_queue);

2584 2585 2586 2587 2588
out:
	kfree(options);
	return ret;
}

2589 2590
static ssize_t srp_create_target(struct device *dev,
				 struct device_attribute *attr,
2591 2592 2593
				 const char *buf, size_t count)
{
	struct srp_host *host =
2594
		container_of(dev, struct srp_host, dev);
2595 2596
	struct Scsi_Host *target_host;
	struct srp_target_port *target;
2597
	struct ib_device *ibdev = host->srp_dev->dev;
2598
	int ret;
2599 2600 2601 2602 2603 2604

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

2605
	target_host->transportt  = ib_srp_transport_template;
2606 2607
	target_host->max_channel = 0;
	target_host->max_id      = 1;
A
Arne Redlich 已提交
2608 2609
	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
2610

2611 2612
	target = host_to_target(target_host);

2613 2614 2615 2616 2617 2618
	target->io_class	= SRP_REV16A_IB_IO_CLASS;
	target->scsi_host	= target_host;
	target->srp_host	= host;
	target->lkey		= host->srp_dev->mr->lkey;
	target->rkey		= host->srp_dev->mr->rkey;
	target->cmd_sg_cnt	= cmd_sg_entries;
2619 2620
	target->sg_tablesize	= indirect_sg_entries ? : cmd_sg_entries;
	target->allow_ext_sg	= allow_ext_sg;
2621
	target->tl_retry_count	= 7;
2622
	target->queue_size	= SRP_DEFAULT_QUEUE_SIZE;
2623

2624 2625
	mutex_lock(&host->add_target_mutex);

2626 2627 2628 2629
	ret = srp_parse_options(buf, target);
	if (ret)
		goto err;

2630 2631
	target->req_ring_size = target->queue_size - SRP_TSK_MGMT_SQ_SIZE;

2632 2633 2634 2635 2636 2637 2638 2639 2640 2641
	if (!srp_conn_unique(target->srp_host, target)) {
		shost_printk(KERN_INFO, target->scsi_host,
			     PFX "Already connected to target port with id_ext=%016llx;ioc_guid=%016llx;initiator_ext=%016llx\n",
			     be64_to_cpu(target->id_ext),
			     be64_to_cpu(target->ioc_guid),
			     be64_to_cpu(target->initiator_ext));
		ret = -EEXIST;
		goto err;
	}

2642 2643
	if (!host->srp_dev->fmr_pool && !target->allow_ext_sg &&
				target->cmd_sg_cnt < target->sg_tablesize) {
2644
		pr_warn("No FMR pool and no external indirect descriptors, limiting sg_tablesize to cmd_sg_cnt\n");
2645 2646 2647 2648 2649 2650
		target->sg_tablesize = target->cmd_sg_cnt;
	}

	target_host->sg_tablesize = target->sg_tablesize;
	target->indirect_size = target->sg_tablesize *
				sizeof (struct srp_direct_buf);
2651 2652 2653 2654
	target->max_iu_len = sizeof (struct srp_cmd) +
			     sizeof (struct srp_indirect_buf) +
			     target->cmd_sg_cnt * sizeof (struct srp_direct_buf);

2655
	INIT_WORK(&target->tl_err_work, srp_tl_err_work);
2656
	INIT_WORK(&target->remove_work, srp_remove_work);
2657 2658
	spin_lock_init(&target->lock);
	INIT_LIST_HEAD(&target->free_tx);
2659 2660 2661
	ret = srp_alloc_req_data(target);
	if (ret)
		goto err_free_mem;
2662

2663 2664 2665
	ret = ib_query_gid(ibdev, host->port, 0, &target->path.sgid);
	if (ret)
		goto err_free_mem;
2666 2667 2668

	ret = srp_create_target_ib(target);
	if (ret)
2669
		goto err_free_mem;
2670

D
David Dillow 已提交
2671 2672
	ret = srp_new_cm_id(target);
	if (ret)
2673
		goto err_free_ib;
2674 2675 2676

	ret = srp_connect_target(target);
	if (ret) {
2677 2678
		shost_printk(KERN_ERR, target->scsi_host,
			     PFX "Connection failed\n");
2679 2680 2681 2682 2683 2684 2685
		goto err_cm_id;
	}

	ret = srp_add_target(host, target);
	if (ret)
		goto err_disconnect;

B
Bart Van Assche 已提交
2686 2687 2688 2689 2690 2691 2692 2693
	shost_printk(KERN_DEBUG, target->scsi_host, PFX
		     "new target: id_ext %016llx ioc_guid %016llx pkey %04x service_id %016llx sgid %pI6 dgid %pI6\n",
		     be64_to_cpu(target->id_ext),
		     be64_to_cpu(target->ioc_guid),
		     be16_to_cpu(target->path.pkey),
		     be64_to_cpu(target->service_id),
		     target->path.sgid.raw, target->path.dgid.raw);

2694 2695 2696 2697 2698
	ret = count;

out:
	mutex_unlock(&host->add_target_mutex);
	return ret;
2699 2700 2701 2702 2703 2704 2705

err_disconnect:
	srp_disconnect_target(target);

err_cm_id:
	ib_destroy_cm_id(target->cm_id);

2706
err_free_ib:
2707 2708
	srp_free_target_ib(target);

2709 2710 2711
err_free_mem:
	srp_free_req_data(target);

2712 2713
err:
	scsi_host_put(target_host);
2714
	goto out;
2715 2716
}

2717
static DEVICE_ATTR(add_target, S_IWUSR, NULL, srp_create_target);
2718

2719 2720
static ssize_t show_ibdev(struct device *dev, struct device_attribute *attr,
			  char *buf)
2721
{
2722
	struct srp_host *host = container_of(dev, struct srp_host, dev);
2723

2724
	return sprintf(buf, "%s\n", host->srp_dev->dev->name);
2725 2726
}

2727
static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
2728

2729 2730
static ssize_t show_port(struct device *dev, struct device_attribute *attr,
			 char *buf)
2731
{
2732
	struct srp_host *host = container_of(dev, struct srp_host, dev);
2733 2734 2735 2736

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

2737
static DEVICE_ATTR(port, S_IRUGO, show_port, NULL);
2738

2739
static struct srp_host *srp_add_port(struct srp_device *device, u8 port)
2740 2741 2742 2743 2744 2745 2746 2747
{
	struct srp_host *host;

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

	INIT_LIST_HEAD(&host->target_list);
2748
	spin_lock_init(&host->target_lock);
2749
	init_completion(&host->released);
2750
	mutex_init(&host->add_target_mutex);
2751
	host->srp_dev = device;
2752 2753
	host->port = port;

2754 2755
	host->dev.class = &srp_class;
	host->dev.parent = device->dev->dma_device;
2756
	dev_set_name(&host->dev, "srp-%s-%d", device->dev->name, port);
2757

2758
	if (device_register(&host->dev))
2759
		goto free_host;
2760
	if (device_create_file(&host->dev, &dev_attr_add_target))
2761
		goto err_class;
2762
	if (device_create_file(&host->dev, &dev_attr_ibdev))
2763
		goto err_class;
2764
	if (device_create_file(&host->dev, &dev_attr_port))
2765 2766 2767 2768 2769
		goto err_class;

	return host;

err_class:
2770
	device_unregister(&host->dev);
2771

2772
free_host:
2773 2774 2775 2776 2777 2778 2779
	kfree(host);

	return NULL;
}

static void srp_add_one(struct ib_device *device)
{
2780 2781 2782
	struct srp_device *srp_dev;
	struct ib_device_attr *dev_attr;
	struct ib_fmr_pool_param fmr_param;
2783
	struct srp_host *host;
2784
	int max_pages_per_fmr, fmr_page_shift, s, e, p;
2785

2786 2787
	dev_attr = kmalloc(sizeof *dev_attr, GFP_KERNEL);
	if (!dev_attr)
2788
		return;
2789

2790
	if (ib_query_device(device, dev_attr)) {
2791
		pr_warn("Query device failed for %s\n", device->name);
2792 2793 2794 2795 2796 2797 2798 2799 2800
		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
2801 2802
	 * minimum of 4096 bytes. We're unlikely to build large sglists
	 * out of smaller entries.
2803
	 */
2804 2805 2806 2807
	fmr_page_shift		= max(12, ffs(dev_attr->page_size_cap) - 1);
	srp_dev->fmr_page_size	= 1 << fmr_page_shift;
	srp_dev->fmr_page_mask	= ~((u64) srp_dev->fmr_page_size - 1);
	srp_dev->fmr_max_size	= srp_dev->fmr_page_size * SRP_FMR_SIZE;
2808 2809 2810 2811 2812 2813 2814 2815 2816 2817 2818 2819 2820 2821 2822

	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;

2823 2824 2825 2826 2827 2828 2829 2830 2831 2832 2833 2834 2835 2836 2837 2838 2839 2840
	for (max_pages_per_fmr = SRP_FMR_SIZE;
			max_pages_per_fmr >= SRP_FMR_MIN_SIZE;
			max_pages_per_fmr /= 2, srp_dev->fmr_max_size /= 2) {
		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 = max_pages_per_fmr;
		fmr_param.page_shift	    = 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))
			break;
	}

2841 2842
	if (IS_ERR(srp_dev->fmr_pool))
		srp_dev->fmr_pool = NULL;
2843

T
Tom Tucker 已提交
2844
	if (device->node_type == RDMA_NODE_IB_SWITCH) {
2845 2846 2847 2848 2849 2850 2851 2852
		s = 0;
		e = 0;
	} else {
		s = 1;
		e = device->phys_port_cnt;
	}

	for (p = s; p <= e; ++p) {
2853
		host = srp_add_port(srp_dev, p);
2854
		if (host)
2855
			list_add_tail(&host->list, &srp_dev->dev_list);
2856 2857
	}

2858 2859 2860 2861 2862 2863 2864 2865 2866 2867 2868 2869
	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);
2870 2871 2872 2873
}

static void srp_remove_one(struct ib_device *device)
{
2874
	struct srp_device *srp_dev;
2875
	struct srp_host *host, *tmp_host;
2876
	struct srp_target_port *target;
2877

2878
	srp_dev = ib_get_client_data(device, &srp_client);
2879 2880
	if (!srp_dev)
		return;
2881

2882
	list_for_each_entry_safe(host, tmp_host, &srp_dev->dev_list, list) {
2883
		device_unregister(&host->dev);
2884 2885 2886 2887 2888 2889 2890
		/*
		 * Wait for the sysfs entry to go away, so that no new
		 * target ports can be created.
		 */
		wait_for_completion(&host->released);

		/*
2891
		 * Remove all target ports.
2892
		 */
2893
		spin_lock(&host->target_lock);
2894 2895
		list_for_each_entry(target, &host->target_list, list)
			srp_queue_remove_work(target);
2896
		spin_unlock(&host->target_lock);
2897 2898

		/*
2899
		 * Wait for target port removal tasks.
2900
		 */
2901
		flush_workqueue(system_long_wq);
2902 2903 2904 2905

		kfree(host);
	}

2906 2907 2908 2909 2910 2911
	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);
2912 2913
}

2914
static struct srp_function_template ib_srp_transport_functions = {
2915 2916
	.has_rport_state	 = true,
	.reset_timer_if_blocked	 = true,
2917
	.reconnect_delay	 = &srp_reconnect_delay,
2918 2919 2920
	.fast_io_fail_tmo	 = &srp_fast_io_fail_tmo,
	.dev_loss_tmo		 = &srp_dev_loss_tmo,
	.reconnect		 = srp_rport_reconnect,
2921
	.rport_delete		 = srp_rport_delete,
2922
	.terminate_rport_io	 = srp_terminate_io,
2923 2924
};

2925 2926 2927 2928
static int __init srp_init_module(void)
{
	int ret;

2929
	BUILD_BUG_ON(FIELD_SIZEOF(struct ib_wc, wr_id) < sizeof(void *));
2930

2931
	if (srp_sg_tablesize) {
2932
		pr_warn("srp_sg_tablesize is deprecated, please use cmd_sg_entries\n");
2933 2934 2935 2936 2937 2938 2939 2940
		if (!cmd_sg_entries)
			cmd_sg_entries = srp_sg_tablesize;
	}

	if (!cmd_sg_entries)
		cmd_sg_entries = SRP_DEF_SG_TABLESIZE;

	if (cmd_sg_entries > 255) {
2941
		pr_warn("Clamping cmd_sg_entries to 255\n");
2942
		cmd_sg_entries = 255;
2943 2944
	}

2945 2946 2947
	if (!indirect_sg_entries)
		indirect_sg_entries = cmd_sg_entries;
	else if (indirect_sg_entries < cmd_sg_entries) {
2948 2949
		pr_warn("Bumping up indirect_sg_entries to match cmd_sg_entries (%u)\n",
			cmd_sg_entries);
2950 2951 2952
		indirect_sg_entries = cmd_sg_entries;
	}

2953 2954 2955 2956 2957
	ib_srp_transport_template =
		srp_attach_transport(&ib_srp_transport_functions);
	if (!ib_srp_transport_template)
		return -ENOMEM;

2958 2959
	ret = class_register(&srp_class);
	if (ret) {
2960
		pr_err("couldn't register class infiniband_srp\n");
2961
		srp_release_transport(ib_srp_transport_template);
2962 2963 2964
		return ret;
	}

2965 2966
	ib_sa_register_client(&srp_sa_client);

2967 2968
	ret = ib_register_client(&srp_client);
	if (ret) {
2969
		pr_err("couldn't register IB client\n");
2970
		srp_release_transport(ib_srp_transport_template);
2971
		ib_sa_unregister_client(&srp_sa_client);
2972 2973 2974 2975 2976 2977 2978 2979 2980 2981
		class_unregister(&srp_class);
		return ret;
	}

	return 0;
}

static void __exit srp_cleanup_module(void)
{
	ib_unregister_client(&srp_client);
2982
	ib_sa_unregister_client(&srp_sa_client);
2983
	class_unregister(&srp_class);
2984
	srp_release_transport(ib_srp_transport_template);
2985 2986 2987 2988
}

module_init(srp_init_module);
module_exit(srp_cleanup_module);