ib_srp.c 79.3 KB
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/*
 * Copyright (c) 2005 Cisco Systems.  All rights reserved.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * OpenIB.org BSD license below:
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *      - Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer.
 *
 *      - Redistributions in binary form must reproduce the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer in the documentation and/or other materials
 *        provided with the distribution.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

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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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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)
{
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	struct srp_device *dev = target->srp_host->srp_dev;
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	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(dev->dev, srp_recv_completion, NULL, target,
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			       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(dev->dev, srp_send_completion, NULL, target,
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			       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(dev->pd, init_attr);
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	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
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	 * In the published SRP specification (draft rev. 16a), the
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	 * port identifier format is 8 bytes of ID extension followed
	 * by 8 bytes of GUID.  Older drafts put the two halves in the
	 * opposite order, so that the GUID comes first.
	 *
	 * Targets conforming to these obsolete drafts can be
	 * recognized by the I/O Class they report.
	 */
	if (target->io_class == SRP_REV10_IB_IO_CLASS) {
		memcpy(req->priv.initiator_port_id,
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		       &target->path.sgid.global.interface_id, 8);
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		memcpy(req->priv.initiator_port_id + 8,
499
		       &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.
515
	 */
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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;
}

643 644 645 646 647 648 649 650 651 652 653 654 655 656 657
/**
 * 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);
}

658 659
static void srp_remove_target(struct srp_target_port *target)
{
660 661
	WARN_ON_ONCE(target->state != SRP_TARGET_REMOVED);

662
	srp_del_scsi_host_attr(target->scsi_host);
663
	srp_rport_get(target->rport);
664 665
	srp_remove_host(target->scsi_host);
	scsi_remove_host(target->scsi_host);
666
	srp_stop_rport_timers(target->rport);
667
	srp_disconnect_target(target);
668 669
	ib_destroy_cm_id(target->cm_id);
	srp_free_target_ib(target);
670
	cancel_work_sync(&target->tl_err_work);
671
	srp_rport_put(target->rport);
672
	srp_free_req_data(target);
673 674 675 676 677

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

678 679 680
	scsi_host_put(target->scsi_host);
}

D
David Howells 已提交
681
static void srp_remove_work(struct work_struct *work)
682
{
D
David Howells 已提交
683
	struct srp_target_port *target =
684
		container_of(work, struct srp_target_port, remove_work);
685

686
	WARN_ON_ONCE(target->state != SRP_TARGET_REMOVED);
687

688
	srp_remove_target(target);
689 690
}

691 692 693 694 695 696 697
static void srp_rport_delete(struct srp_rport *rport)
{
	struct srp_target_port *target = rport->lld_data;

	srp_queue_remove_work(target);
}

698 699
static int srp_connect_target(struct srp_target_port *target)
{
D
David Dillow 已提交
700
	int retries = 3;
701 702
	int ret;

703 704
	WARN_ON_ONCE(target->connected);

705 706
	target->qp_in_error = false;

707 708 709 710 711 712 713 714 715
	ret = srp_lookup_path(target);
	if (ret)
		return ret;

	while (1) {
		init_completion(&target->done);
		ret = srp_send_req(target);
		if (ret)
			return ret;
716 717 718
		ret = wait_for_completion_interruptible(&target->done);
		if (ret < 0)
			return ret;
719 720 721 722 723 724 725 726 727

		/*
		 * 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:
728
			srp_change_conn_state(target, true);
729 730 731 732 733 734 735 736 737 738 739
			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
740 741 742 743 744 745 746 747 748 749 750 751 752 753 754
		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;

755 756 757 758 759 760
		default:
			return target->status;
		}
	}
}

761 762 763 764
static void srp_unmap_data(struct scsi_cmnd *scmnd,
			   struct srp_target_port *target,
			   struct srp_request *req)
{
765 766 767
	struct ib_device *ibdev = target->srp_host->srp_dev->dev;
	struct ib_pool_fmr **pfmr;

768
	if (!scsi_sglist(scmnd) ||
769 770 771 772
	    (scmnd->sc_data_direction != DMA_TO_DEVICE &&
	     scmnd->sc_data_direction != DMA_FROM_DEVICE))
		return;

773 774 775
	pfmr = req->fmr_list;
	while (req->nfmr--)
		ib_fmr_pool_unmap(*pfmr++);
776

777 778
	ib_dma_unmap_sg(ibdev, scsi_sglist(scmnd), scsi_sg_count(scmnd),
			scmnd->sc_data_direction);
779 780
}

B
Bart Van Assche 已提交
781 782 783 784
/**
 * srp_claim_req - Take ownership of the scmnd associated with a request.
 * @target: SRP target port.
 * @req: SRP request.
785
 * @sdev: If not NULL, only take ownership for this SCSI device.
B
Bart Van Assche 已提交
786 787 788 789 790 791 792 793
 * @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,
794
				       struct scsi_device *sdev,
B
Bart Van Assche 已提交
795 796 797 798 799
				       struct scsi_cmnd *scmnd)
{
	unsigned long flags;

	spin_lock_irqsave(&target->lock, flags);
800 801 802
	if (req->scmnd &&
	    (!sdev || req->scmnd->device == sdev) &&
	    (!scmnd || req->scmnd == scmnd)) {
B
Bart Van Assche 已提交
803 804 805 806 807 808 809 810 811 812 813 814
		scmnd = req->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.
815 816 817 818
 * @target: SRP target port.
 * @req:    Request to be freed.
 * @scmnd:  SCSI command associated with @req.
 * @req_lim_delta: Amount to be added to @target->req_lim.
B
Bart Van Assche 已提交
819 820 821 822
 */
static void srp_free_req(struct srp_target_port *target,
			 struct srp_request *req, struct scsi_cmnd *scmnd,
			 s32 req_lim_delta)
823
{
824 825
	unsigned long flags;

B
Bart Van Assche 已提交
826 827
	srp_unmap_data(scmnd, target, req);

828
	spin_lock_irqsave(&target->lock, flags);
829
	target->req_lim += req_lim_delta;
830
	list_add_tail(&req->list, &target->free_reqs);
831
	spin_unlock_irqrestore(&target->lock, flags);
832 833
}

834
static void srp_finish_req(struct srp_target_port *target,
835 836
			   struct srp_request *req, struct scsi_device *sdev,
			   int result)
837
{
838
	struct scsi_cmnd *scmnd = srp_claim_req(target, req, sdev, NULL);
B
Bart Van Assche 已提交
839 840

	if (scmnd) {
841
		srp_free_req(target, req, scmnd, 0);
842
		scmnd->result = result;
B
Bart Van Assche 已提交
843 844
		scmnd->scsi_done(scmnd);
	}
845 846
}

847
static void srp_terminate_io(struct srp_rport *rport)
848
{
849
	struct srp_target_port *target = rport->lld_data;
850 851
	struct Scsi_Host *shost = target->scsi_host;
	struct scsi_device *sdev;
852 853
	int i;

854 855 856 857 858 859 860
	/*
	 * Invoking srp_terminate_io() while srp_queuecommand() is running
	 * is not safe. Hence the warning statement below.
	 */
	shost_for_each_device(sdev, shost)
		WARN_ON_ONCE(sdev->request_queue->request_fn_active);

861
	for (i = 0; i < target->req_ring_size; ++i) {
862
		struct srp_request *req = &target->req_ring[i];
863
		srp_finish_req(target, req, NULL, DID_TRANSPORT_FAILFAST << 16);
864 865
	}
}
866

867 868 869 870 871 872 873 874 875 876 877 878 879
/*
 * 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;
880

881 882
	srp_disconnect_target(target);
	/*
883 884 885
	 * 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.
886
	 */
D
David Dillow 已提交
887
	ret = srp_new_cm_id(target);
888 889 890 891 892 893 894 895 896
	/*
	 * 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);
897

898
	for (i = 0; i < target->req_ring_size; ++i) {
899
		struct srp_request *req = &target->req_ring[i];
900
		srp_finish_req(target, req, NULL, DID_RESET << 16);
901
	}
902

903
	INIT_LIST_HEAD(&target->free_tx);
904
	for (i = 0; i < target->queue_size; ++i)
905
		list_add(&target->tx_ring[i]->list, &target->free_tx);
906

907 908
	if (ret == 0)
		ret = srp_connect_target(target);
909

910 911 912
	if (ret == 0)
		shost_printk(KERN_INFO, target->scsi_host,
			     PFX "reconnect succeeded\n");
913 914 915 916

	return ret;
}

917 918
static void srp_map_desc(struct srp_map_state *state, dma_addr_t dma_addr,
			 unsigned int dma_len, u32 rkey)
919
{
920
	struct srp_direct_buf *desc = state->desc;
921

922 923 924
	desc->va = cpu_to_be64(dma_addr);
	desc->key = cpu_to_be32(rkey);
	desc->len = cpu_to_be32(dma_len);
925

926 927 928 929
	state->total_len += dma_len;
	state->desc++;
	state->ndesc++;
}
930

931 932 933 934 935 936
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;
937

938 939 940 941
	fmr = ib_fmr_pool_map_phys(dev->fmr_pool, state->pages,
				   state->npages, io_addr);
	if (IS_ERR(fmr))
		return PTR_ERR(fmr);
942

943 944
	*state->next_fmr++ = fmr;
	state->nfmr++;
945

946
	srp_map_desc(state, 0, state->fmr_len, fmr->fmr->rkey);
947

948 949 950
	return 0;
}

951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972
static int srp_finish_mapping(struct srp_map_state *state,
			      struct srp_target_port *target)
{
	int ret = 0;

	if (state->npages == 0)
		return 0;

	if (state->npages == 1)
		srp_map_desc(state, state->base_dma_addr, state->fmr_len,
			     target->rkey);
	else
		ret = srp_map_finish_fmr(state, target);

	if (ret == 0) {
		state->npages = 0;
		state->fmr_len = 0;
	}

	return ret;
}

973 974 975 976 977 978 979 980
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;
}
981

982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003
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;
1004
	}
1005

1006 1007 1008 1009 1010 1011 1012
	/* 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) {
1013
		ret = srp_finish_mapping(state, target);
1014 1015 1016 1017 1018 1019
		if (ret)
			return ret;

		srp_map_desc(state, dma_addr, dma_len, target->rkey);
		srp_map_update_start(state, NULL, 0, 0);
		return 0;
1020 1021
	}

1022 1023 1024 1025 1026 1027 1028
	/* 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);
1029

1030 1031
	while (dma_len) {
		if (state->npages == SRP_FMR_SIZE) {
1032
			ret = srp_finish_mapping(state, target);
1033 1034
			if (ret)
				return ret;
1035

1036 1037 1038 1039
			srp_map_update_start(state, sg, sg_index, dma_addr);
		}

		len = min_t(unsigned int, dma_len, dev->fmr_page_size);
1040

1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054
		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) {
1055
		ret = srp_finish_mapping(state, target);
1056 1057 1058
		if (!ret)
			srp_map_update_start(state, NULL, 0, 0);
	}
1059 1060 1061
	return ret;
}

1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097
static void srp_map_fmr(struct srp_map_state *state,
			struct srp_target_port *target, struct srp_request *req,
			struct scatterlist *scat, int count)
{
	struct srp_device *dev = target->srp_host->srp_dev;
	struct ib_device *ibdev = dev->dev;
	struct scatterlist *sg;
	int i, use_fmr;

	state->desc	= req->indirect_desc;
	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);
		}
	}

1098
	if (use_fmr == SRP_MAP_ALLOW_FMR && srp_finish_mapping(state, target))
1099 1100 1101 1102 1103
		goto backtrack;

	req->nfmr = state->nfmr;
}

1104 1105 1106
static int srp_map_data(struct scsi_cmnd *scmnd, struct srp_target_port *target,
			struct srp_request *req)
{
1107
	struct scatterlist *scat;
1108
	struct srp_cmd *cmd = req->cmd->buf;
1109
	int len, nents, count;
1110 1111
	struct srp_device *dev;
	struct ib_device *ibdev;
1112 1113 1114 1115
	struct srp_map_state state;
	struct srp_indirect_buf *indirect_hdr;
	u32 table_len;
	u8 fmt;
1116

1117
	if (!scsi_sglist(scmnd) || scmnd->sc_data_direction == DMA_NONE)
1118 1119 1120 1121
		return sizeof (struct srp_cmd);

	if (scmnd->sc_data_direction != DMA_FROM_DEVICE &&
	    scmnd->sc_data_direction != DMA_TO_DEVICE) {
1122 1123 1124
		shost_printk(KERN_WARNING, target->scsi_host,
			     PFX "Unhandled data direction %d\n",
			     scmnd->sc_data_direction);
1125 1126 1127
		return -EINVAL;
	}

1128 1129
	nents = scsi_sg_count(scmnd);
	scat  = scsi_sglist(scmnd);
1130

1131
	dev = target->srp_host->srp_dev;
1132 1133 1134
	ibdev = dev->dev;

	count = ib_dma_map_sg(ibdev, scat, nents, scmnd->sc_data_direction);
1135 1136
	if (unlikely(count == 0))
		return -EIO;
1137 1138 1139

	fmt = SRP_DATA_DESC_DIRECT;
	len = sizeof (struct srp_cmd) +	sizeof (struct srp_direct_buf);
1140

1141
	if (count == 1) {
1142 1143 1144 1145 1146 1147
		/*
		 * 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.
		 */
1148
		struct srp_direct_buf *buf = (void *) cmd->add_data;
1149

1150
		buf->va  = cpu_to_be64(ib_sg_dma_address(ibdev, scat));
1151
		buf->key = cpu_to_be32(target->rkey);
1152
		buf->len = cpu_to_be32(ib_sg_dma_len(ibdev, scat));
1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163

		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;

1164 1165 1166
	ib_dma_sync_single_for_cpu(ibdev, req->indirect_dma_addr,
				   target->indirect_size, DMA_TO_DEVICE);

1167
	memset(&state, 0, sizeof(state));
1168
	srp_map_fmr(&state, target, req, scat, count);
1169

1170 1171 1172 1173 1174
	/* 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.
1175 1176 1177 1178 1179 1180
	 */
	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;
1181

1182
		*buf = req->indirect_desc[0];
1183
		goto map_complete;
1184 1185
	}

1186 1187 1188 1189 1190 1191 1192 1193
	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);
1194 1195 1196 1197
	table_len = state.ndesc * sizeof (struct srp_direct_buf);

	fmt = SRP_DATA_DESC_INDIRECT;
	len = sizeof(struct srp_cmd) + sizeof (struct srp_indirect_buf);
1198
	len += count * sizeof (struct srp_direct_buf);
1199

1200 1201
	memcpy(indirect_hdr->desc_list, req->indirect_desc,
	       count * sizeof (struct srp_direct_buf));
1202

1203
	indirect_hdr->table_desc.va = cpu_to_be64(req->indirect_dma_addr);
1204 1205 1206 1207 1208
	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)
1209
		cmd->data_out_desc_cnt = count;
1210
	else
1211 1212 1213 1214
		cmd->data_in_desc_cnt = count;

	ib_dma_sync_single_for_device(ibdev, req->indirect_dma_addr, table_len,
				      DMA_TO_DEVICE);
1215 1216

map_complete:
1217 1218 1219 1220 1221 1222 1223 1224
	if (scmnd->sc_data_direction == DMA_TO_DEVICE)
		cmd->buf_fmt = fmt << 4;
	else
		cmd->buf_fmt = fmt;

	return len;
}

1225 1226 1227 1228 1229 1230 1231 1232
/*
 * 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;

1233
	spin_lock_irqsave(&target->lock, flags);
1234 1235 1236
	list_add(&iu->list, &target->free_tx);
	if (iu_type != SRP_IU_RSP)
		++target->req_lim;
1237
	spin_unlock_irqrestore(&target->lock, flags);
1238 1239
}

1240
/*
1241 1242
 * 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().
1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260
 *
 * 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);

1261
	if (list_empty(&target->free_tx))
1262 1263 1264
		return NULL;

	/* Initiator responses to target requests do not consume credits */
1265 1266 1267 1268 1269 1270 1271
	if (iu_type != SRP_IU_RSP) {
		if (target->req_lim <= rsv) {
			++target->zero_req_lim;
			return NULL;
		}

		--target->req_lim;
1272 1273
	}

1274
	iu = list_first_entry(&target->free_tx, struct srp_iu, list);
1275
	list_del(&iu->list);
1276 1277 1278
	return iu;
}

1279 1280
static int srp_post_send(struct srp_target_port *target,
			 struct srp_iu *iu, int len)
1281 1282 1283 1284 1285 1286
{
	struct ib_sge list;
	struct ib_send_wr wr, *bad_wr;

	list.addr   = iu->dma;
	list.length = len;
1287
	list.lkey   = target->lkey;
1288 1289

	wr.next       = NULL;
1290
	wr.wr_id      = (uintptr_t) iu;
1291 1292 1293 1294 1295
	wr.sg_list    = &list;
	wr.num_sge    = 1;
	wr.opcode     = IB_WR_SEND;
	wr.send_flags = IB_SEND_SIGNALED;

1296
	return ib_post_send(target->qp, &wr, &bad_wr);
1297 1298
}

1299
static int srp_post_recv(struct srp_target_port *target, struct srp_iu *iu)
1300 1301
{
	struct ib_recv_wr wr, *bad_wr;
1302
	struct ib_sge list;
1303 1304 1305

	list.addr   = iu->dma;
	list.length = iu->size;
1306
	list.lkey   = target->lkey;
1307 1308

	wr.next     = NULL;
1309
	wr.wr_id    = (uintptr_t) iu;
1310 1311 1312
	wr.sg_list  = &list;
	wr.num_sge  = 1;

1313
	return ib_post_recv(target->qp, &wr, &bad_wr);
1314 1315
}

1316 1317 1318 1319 1320 1321 1322
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)) {
1323
		spin_lock_irqsave(&target->lock, flags);
1324
		target->req_lim += be32_to_cpu(rsp->req_lim_delta);
1325
		spin_unlock_irqrestore(&target->lock, flags);
1326

1327 1328 1329 1330
		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);
1331
	} else {
1332
		req = &target->req_ring[rsp->tag];
1333
		scmnd = srp_claim_req(target, req, NULL, NULL);
B
Bart Van Assche 已提交
1334
		if (!scmnd) {
1335 1336 1337
			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
1338 1339 1340 1341 1342 1343 1344

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

			return;
		}
1345 1346 1347 1348 1349 1350 1351 1352 1353 1354
		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))
1355
			scsi_set_resid(scmnd, be32_to_cpu(rsp->data_out_res_cnt));
1356
		else if (rsp->flags & (SRP_RSP_FLAG_DIOVER | SRP_RSP_FLAG_DIUNDER))
1357
			scsi_set_resid(scmnd, be32_to_cpu(rsp->data_in_res_cnt));
1358

B
Bart Van Assche 已提交
1359 1360 1361
		srp_free_req(target, req, scmnd,
			     be32_to_cpu(rsp->req_lim_delta));

1362 1363
		scmnd->host_scribble = NULL;
		scmnd->scsi_done(scmnd);
1364 1365 1366
	}
}

1367 1368 1369
static int srp_response_common(struct srp_target_port *target, s32 req_delta,
			       void *rsp, int len)
{
1370
	struct ib_device *dev = target->srp_host->srp_dev->dev;
1371 1372
	unsigned long flags;
	struct srp_iu *iu;
1373
	int err;
1374

1375
	spin_lock_irqsave(&target->lock, flags);
1376 1377
	target->req_lim += req_delta;
	iu = __srp_get_tx_iu(target, SRP_IU_RSP);
1378
	spin_unlock_irqrestore(&target->lock, flags);
1379

1380 1381 1382
	if (!iu) {
		shost_printk(KERN_ERR, target->scsi_host, PFX
			     "no IU available to send response\n");
1383
		return 1;
1384 1385 1386 1387 1388 1389
	}

	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);

1390 1391
	err = srp_post_send(target, iu, len);
	if (err) {
1392 1393
		shost_printk(KERN_ERR, target->scsi_host, PFX
			     "unable to post response: %d\n", err);
1394 1395
		srp_put_tx_iu(target, iu, SRP_IU_RSP);
	}
1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430

	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");
}

1431 1432
static void srp_handle_recv(struct srp_target_port *target, struct ib_wc *wc)
{
1433
	struct ib_device *dev = target->srp_host->srp_dev->dev;
1434
	struct srp_iu *iu = (struct srp_iu *) (uintptr_t) wc->wr_id;
1435
	int res;
1436 1437
	u8 opcode;

1438 1439
	ib_dma_sync_single_for_cpu(dev, iu->dma, target->max_ti_iu_len,
				   DMA_FROM_DEVICE);
1440 1441 1442 1443

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

	if (0) {
1444 1445
		shost_printk(KERN_ERR, target->scsi_host,
			     PFX "recv completion, opcode 0x%02x\n", opcode);
B
Bart Van Assche 已提交
1446 1447
		print_hex_dump(KERN_ERR, "", DUMP_PREFIX_OFFSET, 8, 1,
			       iu->buf, wc->byte_len, true);
1448 1449 1450 1451 1452 1453 1454
	}

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

1455 1456 1457 1458 1459 1460 1461 1462
	case SRP_CRED_REQ:
		srp_process_cred_req(target, iu->buf);
		break;

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

1463 1464
	case SRP_T_LOGOUT:
		/* XXX Handle target logout */
1465 1466
		shost_printk(KERN_WARNING, target->scsi_host,
			     PFX "Got target logout request\n");
1467 1468 1469
		break;

	default:
1470 1471
		shost_printk(KERN_WARNING, target->scsi_host,
			     PFX "Unhandled SRP opcode 0x%02x\n", opcode);
1472 1473 1474
		break;
	}

1475 1476
	ib_dma_sync_single_for_device(dev, iu->dma, target->max_ti_iu_len,
				      DMA_FROM_DEVICE);
1477

1478
	res = srp_post_recv(target, iu);
1479 1480 1481
	if (res != 0)
		shost_printk(KERN_ERR, target->scsi_host,
			     PFX "Recv failed with error code %d\n", res);
1482 1483
}

1484 1485
/**
 * srp_tl_err_work() - handle a transport layer error
1486
 * @work: Work structure embedded in an SRP target port.
1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499
 *
 * 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);
}

1500
static void srp_handle_qp_err(enum ib_wc_status wc_status, bool send_err,
1501 1502
			      struct srp_target_port *target)
{
1503
	if (target->connected && !target->qp_in_error) {
1504 1505
		shost_printk(KERN_ERR, target->scsi_host,
			     PFX "failed %s status %d\n",
1506
			     send_err ? "send" : "receive",
1507
			     wc_status);
1508
		queue_work(system_long_wq, &target->tl_err_work);
1509
	}
1510 1511 1512
	target->qp_in_error = true;
}

1513
static void srp_recv_completion(struct ib_cq *cq, void *target_ptr)
1514 1515 1516 1517 1518 1519
{
	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) {
1520 1521 1522
		if (likely(wc.status == IB_WC_SUCCESS)) {
			srp_handle_recv(target, &wc);
		} else {
1523
			srp_handle_qp_err(wc.status, false, target);
1524
		}
1525 1526 1527 1528 1529 1530 1531
	}
}

static void srp_send_completion(struct ib_cq *cq, void *target_ptr)
{
	struct srp_target_port *target = target_ptr;
	struct ib_wc wc;
1532
	struct srp_iu *iu;
1533 1534

	while (ib_poll_cq(cq, 1, &wc) > 0) {
1535 1536 1537 1538
		if (likely(wc.status == IB_WC_SUCCESS)) {
			iu = (struct srp_iu *) (uintptr_t) wc.wr_id;
			list_add(&iu->list, &target->free_tx);
		} else {
1539
			srp_handle_qp_err(wc.status, true, target);
1540
		}
1541 1542 1543
	}
}

1544
static int srp_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *scmnd)
1545
{
1546
	struct srp_target_port *target = host_to_target(shost);
1547
	struct srp_rport *rport = target->rport;
1548 1549 1550
	struct srp_request *req;
	struct srp_iu *iu;
	struct srp_cmd *cmd;
1551
	struct ib_device *dev;
1552
	unsigned long flags;
1553
	int len, result;
1554 1555 1556 1557 1558 1559 1560 1561 1562 1563
	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);
1564

1565 1566 1567
	result = srp_chkready(target->rport);
	if (unlikely(result)) {
		scmnd->result = result;
1568
		scmnd->scsi_done(scmnd);
1569
		goto unlock_rport;
1570 1571
	}

1572
	spin_lock_irqsave(&target->lock, flags);
1573
	iu = __srp_get_tx_iu(target, SRP_IU_CMD);
1574
	if (!iu)
1575 1576 1577 1578 1579
		goto err_unlock;

	req = list_first_entry(&target->free_reqs, struct srp_request, list);
	list_del(&req->list);
	spin_unlock_irqrestore(&target->lock, flags);
1580

1581
	dev = target->srp_host->srp_dev->dev;
1582
	ib_dma_sync_single_for_cpu(dev, iu->dma, target->max_iu_len,
1583
				   DMA_TO_DEVICE);
1584 1585

	scmnd->result        = 0;
1586
	scmnd->host_scribble = (void *) req;
1587 1588 1589 1590 1591 1592

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

	cmd->opcode = SRP_CMD;
	cmd->lun    = cpu_to_be64((u64) scmnd->device->lun << 48);
1593
	cmd->tag    = req->index;
1594 1595 1596 1597 1598 1599 1600
	memcpy(cmd->cdb, scmnd->cmnd, scmnd->cmd_len);

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

	len = srp_map_data(scmnd, target, req);
	if (len < 0) {
1601 1602
		shost_printk(KERN_ERR, target->scsi_host,
			     PFX "Failed to map data\n");
1603
		goto err_iu;
1604 1605
	}

1606
	ib_dma_sync_single_for_device(dev, iu->dma, target->max_iu_len,
1607
				      DMA_TO_DEVICE);
1608

1609
	if (srp_post_send(target, iu, len)) {
1610
		shost_printk(KERN_ERR, target->scsi_host, PFX "Send failed\n");
1611 1612 1613
		goto err_unmap;
	}

1614 1615 1616 1617
unlock_rport:
	if (in_scsi_eh)
		mutex_unlock(&rport->mutex);

1618 1619 1620 1621 1622
	return 0;

err_unmap:
	srp_unmap_data(scmnd, target, req);

1623 1624 1625
err_iu:
	srp_put_tx_iu(target, iu, SRP_IU_CMD);

1626 1627 1628 1629 1630 1631
	/*
	 * Avoid that the loops that iterate over the request ring can
	 * encounter a dangling SCSI command pointer.
	 */
	req->scmnd = NULL;

1632
	spin_lock_irqsave(&target->lock, flags);
1633
	list_add(&req->list, &target->free_reqs);
1634 1635

err_unlock:
1636
	spin_unlock_irqrestore(&target->lock, flags);
1637

1638 1639 1640
	if (in_scsi_eh)
		mutex_unlock(&rport->mutex);

1641 1642 1643
	return SCSI_MLQUEUE_HOST_BUSY;
}

1644 1645 1646 1647
/*
 * Note: the resources allocated in this function are freed in
 * srp_free_target_ib().
 */
1648 1649 1650 1651
static int srp_alloc_iu_bufs(struct srp_target_port *target)
{
	int i;

1652 1653 1654 1655 1656 1657 1658 1659 1660 1661
	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) {
1662 1663 1664 1665 1666 1667 1668
		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;
	}

1669
	for (i = 0; i < target->queue_size; ++i) {
1670
		target->tx_ring[i] = srp_alloc_iu(target->srp_host,
1671
						  target->max_iu_len,
1672 1673 1674
						  GFP_KERNEL, DMA_TO_DEVICE);
		if (!target->tx_ring[i])
			goto err;
1675 1676

		list_add(&target->tx_ring[i]->list, &target->free_tx);
1677 1678 1679 1680 1681
	}

	return 0;

err:
1682
	for (i = 0; i < target->queue_size; ++i) {
1683 1684 1685 1686
		srp_free_iu(target->srp_host, target->rx_ring[i]);
		srp_free_iu(target->srp_host, target->tx_ring[i]);
	}

1687 1688 1689 1690 1691 1692 1693

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

1694 1695 1696
	return -ENOMEM;
}

1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723
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;
}

1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743
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);
1744 1745 1746
		target->scsi_host->cmd_per_lun
			= min_t(int, target->scsi_host->can_queue,
				target->scsi_host->cmd_per_lun);
1747 1748 1749 1750 1751 1752 1753
	} else {
		shost_printk(KERN_WARNING, target->scsi_host,
			     PFX "Unhandled RSP opcode %#x\n", lrsp->opcode);
		ret = -ECONNRESET;
		goto error;
	}

1754
	if (!target->rx_ring) {
1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773
		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;

1774
	for (i = 0; i < target->queue_size; i++) {
1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785
		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;

1786 1787
	target->rq_tmo_jiffies = srp_compute_rq_tmo(qp_attr, attr_mask);

1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800
	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;
}

1801 1802 1803 1804
static void srp_cm_rej_handler(struct ib_cm_id *cm_id,
			       struct ib_cm_event *event,
			       struct srp_target_port *target)
{
1805
	struct Scsi_Host *shost = target->scsi_host;
1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821
	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:
1822
		if (srp_target_is_topspin(target)) {
1823 1824 1825 1826 1827 1828 1829 1830
			/*
			 * 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);

1831 1832 1833 1834
			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));
1835 1836 1837

			target->status = SRP_PORT_REDIRECT;
		} else {
1838 1839
			shost_printk(KERN_WARNING, shost,
				     "  REJ reason: IB_CM_REJ_PORT_REDIRECT\n");
1840 1841 1842 1843 1844
			target->status = -ECONNRESET;
		}
		break;

	case IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID:
1845 1846
		shost_printk(KERN_WARNING, shost,
			    "  REJ reason: IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID\n");
1847 1848 1849 1850 1851 1852 1853 1854 1855 1856
		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)
1857 1858
				shost_printk(KERN_WARNING, shost,
					     PFX "SRP_LOGIN_REJ: requested max_it_iu_len too large\n");
1859
			else
B
Bart Van Assche 已提交
1860 1861 1862 1863
				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);
1864
		} else
1865 1866 1867
			shost_printk(KERN_WARNING, shost,
				     "  REJ reason: IB_CM_REJ_CONSUMER_DEFINED,"
				     " opcode 0x%02x\n", opcode);
1868 1869 1870
		target->status = -ECONNRESET;
		break;

D
David Dillow 已提交
1871 1872 1873 1874 1875
	case IB_CM_REJ_STALE_CONN:
		shost_printk(KERN_WARNING, shost, "  REJ reason: stale connection\n");
		target->status = SRP_STALE_CONN;
		break;

1876
	default:
1877 1878
		shost_printk(KERN_WARNING, shost, "  REJ reason 0x%x\n",
			     event->param.rej_rcvd.reason);
1879 1880 1881 1882 1883 1884 1885 1886 1887 1888 1889
		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:
1890 1891
		shost_printk(KERN_DEBUG, target->scsi_host,
			     PFX "Sending CM REQ failed\n");
1892 1893 1894 1895 1896 1897
		comp = 1;
		target->status = -ECONNRESET;
		break;

	case IB_CM_REP_RECEIVED:
		comp = 1;
1898
		srp_cm_rep_handler(cm_id, event->private_data, target);
1899 1900 1901
		break;

	case IB_CM_REJ_RECEIVED:
1902
		shost_printk(KERN_DEBUG, target->scsi_host, PFX "REJ received\n");
1903 1904 1905 1906 1907
		comp = 1;

		srp_cm_rej_handler(cm_id, event, target);
		break;

1908
	case IB_CM_DREQ_RECEIVED:
1909 1910
		shost_printk(KERN_WARNING, target->scsi_host,
			     PFX "DREQ received - connection closed\n");
1911
		srp_change_conn_state(target, false);
1912
		if (ib_send_cm_drep(cm_id, NULL, 0))
1913 1914
			shost_printk(KERN_ERR, target->scsi_host,
				     PFX "Sending CM DREP failed\n");
1915
		queue_work(system_long_wq, &target->tl_err_work);
1916 1917 1918
		break;

	case IB_CM_TIMEWAIT_EXIT:
1919 1920
		shost_printk(KERN_ERR, target->scsi_host,
			     PFX "connection closed\n");
1921
		comp = 1;
1922 1923 1924 1925

		target->status = 0;
		break;

1926 1927 1928 1929 1930
	case IB_CM_MRA_RECEIVED:
	case IB_CM_DREQ_ERROR:
	case IB_CM_DREP_RECEIVED:
		break;

1931
	default:
1932 1933
		shost_printk(KERN_WARNING, target->scsi_host,
			     PFX "Unhandled CM event %d\n", event->event);
1934 1935 1936 1937 1938 1939 1940 1941 1942
		break;
	}

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

	return 0;
}

1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993
/**
 * 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;
}

1994
static int srp_send_tsk_mgmt(struct srp_target_port *target,
1995
			     u64 req_tag, unsigned int lun, u8 func)
1996
{
1997
	struct srp_rport *rport = target->rport;
1998
	struct ib_device *dev = target->srp_host->srp_dev->dev;
1999 2000 2001
	struct srp_iu *iu;
	struct srp_tsk_mgmt *tsk_mgmt;

2002 2003 2004
	if (!target->connected || target->qp_in_error)
		return -1;

2005
	init_completion(&target->tsk_mgmt_done);
2006

2007 2008 2009 2010 2011
	/*
	 * 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);
2012
	spin_lock_irq(&target->lock);
2013
	iu = __srp_get_tx_iu(target, SRP_IU_TSK_MGMT);
2014
	spin_unlock_irq(&target->lock);
2015

2016 2017 2018
	if (!iu) {
		mutex_unlock(&rport->mutex);

2019
		return -1;
2020
	}
2021

2022 2023
	ib_dma_sync_single_for_cpu(dev, iu->dma, sizeof *tsk_mgmt,
				   DMA_TO_DEVICE);
2024 2025 2026 2027
	tsk_mgmt = iu->buf;
	memset(tsk_mgmt, 0, sizeof *tsk_mgmt);

	tsk_mgmt->opcode 	= SRP_TSK_MGMT;
2028 2029
	tsk_mgmt->lun		= cpu_to_be64((u64) lun << 48);
	tsk_mgmt->tag		= req_tag | SRP_TAG_TSK_MGMT;
2030
	tsk_mgmt->tsk_mgmt_func = func;
2031
	tsk_mgmt->task_tag	= req_tag;
2032

2033 2034
	ib_dma_sync_single_for_device(dev, iu->dma, sizeof *tsk_mgmt,
				      DMA_TO_DEVICE);
2035 2036
	if (srp_post_send(target, iu, sizeof *tsk_mgmt)) {
		srp_put_tx_iu(target, iu, SRP_IU_TSK_MGMT);
2037 2038
		mutex_unlock(&rport->mutex);

2039 2040
		return -1;
	}
2041
	mutex_unlock(&rport->mutex);
2042

2043
	if (!wait_for_completion_timeout(&target->tsk_mgmt_done,
2044
					 msecs_to_jiffies(SRP_ABORT_TIMEOUT_MS)))
2045
		return -1;
2046

2047 2048 2049
	return 0;
}

2050 2051
static int srp_abort(struct scsi_cmnd *scmnd)
{
2052
	struct srp_target_port *target = host_to_target(scmnd->device->host);
2053
	struct srp_request *req = (struct srp_request *) scmnd->host_scribble;
2054
	int ret;
2055

2056
	shost_printk(KERN_ERR, target->scsi_host, "SRP abort called\n");
2057

2058
	if (!req || !srp_claim_req(target, req, NULL, scmnd))
2059
		return SUCCESS;
2060
	if (srp_send_tsk_mgmt(target, req->index, scmnd->device->lun,
2061
			      SRP_TSK_ABORT_TASK) == 0)
2062
		ret = SUCCESS;
2063
	else if (target->rport->state == SRP_RPORT_LOST)
2064
		ret = FAST_IO_FAIL;
2065 2066
	else
		ret = FAILED;
B
Bart Van Assche 已提交
2067 2068
	srp_free_req(target, req, scmnd, 0);
	scmnd->result = DID_ABORT << 16;
2069
	scmnd->scsi_done(scmnd);
2070

2071
	return ret;
2072 2073 2074 2075
}

static int srp_reset_device(struct scsi_cmnd *scmnd)
{
2076
	struct srp_target_port *target = host_to_target(scmnd->device->host);
2077
	int i;
2078

2079
	shost_printk(KERN_ERR, target->scsi_host, "SRP reset_device called\n");
2080

2081 2082
	if (srp_send_tsk_mgmt(target, SRP_TAG_NO_REQ, scmnd->device->lun,
			      SRP_TSK_LUN_RESET))
2083
		return FAILED;
2084
	if (target->tsk_mgmt_status)
2085 2086
		return FAILED;

2087
	for (i = 0; i < target->req_ring_size; ++i) {
2088
		struct srp_request *req = &target->req_ring[i];
2089
		srp_finish_req(target, req, scmnd->device, DID_RESET << 16);
2090
	}
2091 2092

	return SUCCESS;
2093 2094 2095 2096 2097 2098
}

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

2099
	shost_printk(KERN_ERR, target->scsi_host, PFX "SRP reset_host called\n");
2100

2101
	return srp_reconnect_rport(target->rport) == 0 ? SUCCESS : FAILED;
2102 2103
}

2104 2105 2106 2107 2108 2109 2110 2111 2112 2113 2114 2115 2116 2117 2118
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;
}

2119 2120
static ssize_t show_id_ext(struct device *dev, struct device_attribute *attr,
			   char *buf)
2121
{
2122
	struct srp_target_port *target = host_to_target(class_to_shost(dev));
2123 2124 2125 2126 2127

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

2128 2129
static ssize_t show_ioc_guid(struct device *dev, struct device_attribute *attr,
			     char *buf)
2130
{
2131
	struct srp_target_port *target = host_to_target(class_to_shost(dev));
2132 2133 2134 2135 2136

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

2137 2138
static ssize_t show_service_id(struct device *dev,
			       struct device_attribute *attr, char *buf)
2139
{
2140
	struct srp_target_port *target = host_to_target(class_to_shost(dev));
2141 2142 2143 2144 2145

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

2146 2147
static ssize_t show_pkey(struct device *dev, struct device_attribute *attr,
			 char *buf)
2148
{
2149
	struct srp_target_port *target = host_to_target(class_to_shost(dev));
2150 2151 2152 2153

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

B
Bart Van Assche 已提交
2154 2155 2156 2157 2158 2159 2160 2161
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);
}

2162 2163
static ssize_t show_dgid(struct device *dev, struct device_attribute *attr,
			 char *buf)
2164
{
2165
	struct srp_target_port *target = host_to_target(class_to_shost(dev));
2166

H
Harvey Harrison 已提交
2167
	return sprintf(buf, "%pI6\n", target->path.dgid.raw);
2168 2169
}

2170 2171
static ssize_t show_orig_dgid(struct device *dev,
			      struct device_attribute *attr, char *buf)
2172
{
2173
	struct srp_target_port *target = host_to_target(class_to_shost(dev));
2174

H
Harvey Harrison 已提交
2175
	return sprintf(buf, "%pI6\n", target->orig_dgid);
2176 2177
}

2178 2179 2180 2181 2182 2183 2184 2185
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);
}

2186 2187
static ssize_t show_zero_req_lim(struct device *dev,
				 struct device_attribute *attr, char *buf)
2188
{
2189
	struct srp_target_port *target = host_to_target(class_to_shost(dev));
2190 2191 2192 2193

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

2194 2195
static ssize_t show_local_ib_port(struct device *dev,
				  struct device_attribute *attr, char *buf)
2196
{
2197
	struct srp_target_port *target = host_to_target(class_to_shost(dev));
2198 2199 2200 2201

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

2202 2203
static ssize_t show_local_ib_device(struct device *dev,
				    struct device_attribute *attr, char *buf)
2204
{
2205
	struct srp_target_port *target = host_to_target(class_to_shost(dev));
2206

2207
	return sprintf(buf, "%s\n", target->srp_host->srp_dev->dev->name);
2208 2209
}

2210 2211 2212 2213 2214 2215 2216 2217
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);
}

2218 2219 2220 2221 2222 2223 2224 2225
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);
}

2226 2227 2228 2229 2230 2231 2232 2233
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);
}

2234 2235 2236 2237 2238 2239 2240 2241
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");
}

2242 2243 2244 2245
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
2246
static DEVICE_ATTR(sgid,	    S_IRUGO, show_sgid,		   NULL);
2247 2248
static DEVICE_ATTR(dgid,	    S_IRUGO, show_dgid,		   NULL);
static DEVICE_ATTR(orig_dgid,	    S_IRUGO, show_orig_dgid,	   NULL);
2249
static DEVICE_ATTR(req_lim,         S_IRUGO, show_req_lim,         NULL);
2250 2251 2252
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);
2253
static DEVICE_ATTR(comp_vector,     S_IRUGO, show_comp_vector,     NULL);
2254
static DEVICE_ATTR(tl_retry_count,  S_IRUGO, show_tl_retry_count,  NULL);
2255
static DEVICE_ATTR(cmd_sg_entries,  S_IRUGO, show_cmd_sg_entries,  NULL);
2256
static DEVICE_ATTR(allow_ext_sg,    S_IRUGO, show_allow_ext_sg,    NULL);
2257 2258 2259 2260 2261 2262

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
2263
	&dev_attr_sgid,
2264 2265
	&dev_attr_dgid,
	&dev_attr_orig_dgid,
2266
	&dev_attr_req_lim,
2267 2268 2269
	&dev_attr_zero_req_lim,
	&dev_attr_local_ib_port,
	&dev_attr_local_ib_device,
2270
	&dev_attr_comp_vector,
2271
	&dev_attr_tl_retry_count,
2272
	&dev_attr_cmd_sg_entries,
2273
	&dev_attr_allow_ext_sg,
2274 2275 2276
	NULL
};

2277 2278
static struct scsi_host_template srp_template = {
	.module				= THIS_MODULE,
R
Roland Dreier 已提交
2279 2280
	.name				= "InfiniBand SRP initiator",
	.proc_name			= DRV_NAME,
2281
	.slave_configure		= srp_slave_configure,
2282 2283
	.info				= srp_target_info,
	.queuecommand			= srp_queuecommand,
2284 2285
	.change_queue_depth             = srp_change_queue_depth,
	.change_queue_type              = srp_change_queue_type,
2286 2287 2288
	.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
2289
	.skip_settle_delay		= true,
2290
	.sg_tablesize			= SRP_DEF_SG_TABLESIZE,
2291
	.can_queue			= SRP_DEFAULT_CMD_SQ_SIZE,
2292
	.this_id			= -1,
2293
	.cmd_per_lun			= SRP_DEFAULT_CMD_SQ_SIZE,
2294 2295
	.use_clustering			= ENABLE_CLUSTERING,
	.shost_attrs			= srp_host_attrs
2296 2297 2298 2299
};

static int srp_add_target(struct srp_host *host, struct srp_target_port *target)
{
2300 2301 2302
	struct srp_rport_identifiers ids;
	struct srp_rport *rport;

2303 2304 2305
	sprintf(target->target_name, "SRP.T10:%016llX",
		 (unsigned long long) be64_to_cpu(target->id_ext));

2306
	if (scsi_add_host(target->scsi_host, host->srp_dev->dev->dma_device))
2307 2308
		return -ENODEV;

2309 2310
	memcpy(ids.port_id, &target->id_ext, 8);
	memcpy(ids.port_id + 8, &target->ioc_guid, 8);
2311
	ids.roles = SRP_RPORT_ROLE_TARGET;
2312 2313 2314 2315 2316 2317
	rport = srp_rport_add(target->scsi_host, &ids);
	if (IS_ERR(rport)) {
		scsi_remove_host(target->scsi_host);
		return PTR_ERR(rport);
	}

2318
	rport->lld_data = target;
2319
	target->rport = rport;
2320

2321
	spin_lock(&host->target_lock);
2322
	list_add_tail(&target->list, &host->target_list);
2323
	spin_unlock(&host->target_lock);
2324 2325 2326 2327

	target->state = SRP_TARGET_LIVE;

	scsi_scan_target(&target->scsi_host->shost_gendev,
2328
			 0, target->scsi_id, SCAN_WILD_CARD, 0);
2329 2330 2331 2332

	return 0;
}

2333
static void srp_release_dev(struct device *dev)
2334 2335
{
	struct srp_host *host =
2336
		container_of(dev, struct srp_host, dev);
2337 2338 2339 2340 2341 2342

	complete(&host->released);
}

static struct class srp_class = {
	.name    = "infiniband_srp",
2343
	.dev_release = srp_release_dev
2344 2345
};

2346 2347
/**
 * srp_conn_unique() - check whether the connection to a target is unique
2348 2349
 * @host:   SRP host.
 * @target: SRP target port.
2350 2351 2352 2353 2354 2355 2356 2357 2358 2359 2360 2361 2362 2363 2364 2365 2366 2367 2368 2369 2370 2371 2372 2373 2374 2375 2376 2377
 */
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;
}

2378 2379 2380 2381 2382 2383 2384 2385 2386 2387 2388 2389 2390 2391 2392 2393
/*
 * 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,
2394
	SRP_OPT_MAX_CMD_PER_LUN	= 1 << 6,
2395
	SRP_OPT_IO_CLASS	= 1 << 7,
2396
	SRP_OPT_INITIATOR_EXT	= 1 << 8,
2397
	SRP_OPT_CMD_SG_ENTRIES	= 1 << 9,
2398 2399
	SRP_OPT_ALLOW_EXT_SG	= 1 << 10,
	SRP_OPT_SG_TABLESIZE	= 1 << 11,
2400
	SRP_OPT_COMP_VECTOR	= 1 << 12,
2401
	SRP_OPT_TL_RETRY_COUNT	= 1 << 13,
2402
	SRP_OPT_QUEUE_SIZE	= 1 << 14,
2403 2404 2405 2406 2407 2408 2409
	SRP_OPT_ALL		= (SRP_OPT_ID_EXT	|
				   SRP_OPT_IOC_GUID	|
				   SRP_OPT_DGID		|
				   SRP_OPT_PKEY		|
				   SRP_OPT_SERVICE_ID),
};

2410
static const match_table_t srp_opt_tokens = {
2411 2412 2413 2414 2415 2416 2417
	{ 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" 	},
2418
	{ SRP_OPT_IO_CLASS,		"io_class=%x"		},
2419
	{ SRP_OPT_INITIATOR_EXT,	"initiator_ext=%s"	},
2420
	{ SRP_OPT_CMD_SG_ENTRIES,	"cmd_sg_entries=%u"	},
2421 2422
	{ SRP_OPT_ALLOW_EXT_SG,		"allow_ext_sg=%u"	},
	{ SRP_OPT_SG_TABLESIZE,		"sg_tablesize=%u"	},
2423
	{ SRP_OPT_COMP_VECTOR,		"comp_vector=%u"	},
2424
	{ SRP_OPT_TL_RETRY_COUNT,	"tl_retry_count=%u"	},
2425
	{ SRP_OPT_QUEUE_SIZE,		"queue_size=%d"		},
2426
	{ SRP_OPT_ERR,			NULL 			}
2427 2428 2429 2430 2431 2432 2433 2434 2435 2436 2437 2438 2439 2440 2441 2442 2443 2444 2445 2446 2447 2448 2449 2450 2451 2452 2453 2454
};

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);
2455 2456 2457 2458
			if (!p) {
				ret = -ENOMEM;
				goto out;
			}
2459 2460 2461 2462 2463 2464
			target->id_ext = cpu_to_be64(simple_strtoull(p, NULL, 16));
			kfree(p);
			break;

		case SRP_OPT_IOC_GUID:
			p = match_strdup(args);
2465 2466 2467 2468
			if (!p) {
				ret = -ENOMEM;
				goto out;
			}
2469 2470 2471 2472 2473 2474
			target->ioc_guid = cpu_to_be64(simple_strtoull(p, NULL, 16));
			kfree(p);
			break;

		case SRP_OPT_DGID:
			p = match_strdup(args);
2475 2476 2477 2478
			if (!p) {
				ret = -ENOMEM;
				goto out;
			}
2479
			if (strlen(p) != 32) {
2480
				pr_warn("bad dest GID parameter '%s'\n", p);
2481
				kfree(p);
2482 2483 2484 2485 2486 2487 2488
				goto out;
			}

			for (i = 0; i < 16; ++i) {
				strlcpy(dgid, p + i * 2, 3);
				target->path.dgid.raw[i] = simple_strtoul(dgid, NULL, 16);
			}
2489
			kfree(p);
2490
			memcpy(target->orig_dgid, target->path.dgid.raw, 16);
2491 2492 2493 2494
			break;

		case SRP_OPT_PKEY:
			if (match_hex(args, &token)) {
2495
				pr_warn("bad P_Key parameter '%s'\n", p);
2496 2497 2498 2499 2500 2501 2502
				goto out;
			}
			target->path.pkey = cpu_to_be16(token);
			break;

		case SRP_OPT_SERVICE_ID:
			p = match_strdup(args);
2503 2504 2505 2506
			if (!p) {
				ret = -ENOMEM;
				goto out;
			}
2507
			target->service_id = cpu_to_be64(simple_strtoull(p, NULL, 16));
2508
			target->path.service_id = target->service_id;
2509 2510 2511 2512 2513
			kfree(p);
			break;

		case SRP_OPT_MAX_SECT:
			if (match_int(args, &token)) {
2514
				pr_warn("bad max sect parameter '%s'\n", p);
2515 2516 2517 2518 2519
				goto out;
			}
			target->scsi_host->max_sectors = token;
			break;

2520 2521 2522 2523 2524 2525 2526 2527 2528 2529 2530 2531
		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;

2532
		case SRP_OPT_MAX_CMD_PER_LUN:
2533
			if (match_int(args, &token) || token < 1) {
2534 2535
				pr_warn("bad max cmd_per_lun parameter '%s'\n",
					p);
2536 2537
				goto out;
			}
2538
			target->scsi_host->cmd_per_lun = token;
2539 2540
			break;

2541 2542
		case SRP_OPT_IO_CLASS:
			if (match_hex(args, &token)) {
2543
				pr_warn("bad IO class parameter '%s'\n", p);
2544 2545 2546 2547
				goto out;
			}
			if (token != SRP_REV10_IB_IO_CLASS &&
			    token != SRP_REV16A_IB_IO_CLASS) {
2548 2549 2550
				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);
2551 2552 2553 2554 2555
				goto out;
			}
			target->io_class = token;
			break;

2556 2557
		case SRP_OPT_INITIATOR_EXT:
			p = match_strdup(args);
2558 2559 2560 2561
			if (!p) {
				ret = -ENOMEM;
				goto out;
			}
2562 2563 2564 2565
			target->initiator_ext = cpu_to_be64(simple_strtoull(p, NULL, 16));
			kfree(p);
			break;

2566 2567
		case SRP_OPT_CMD_SG_ENTRIES:
			if (match_int(args, &token) || token < 1 || token > 255) {
2568 2569
				pr_warn("bad max cmd_sg_entries parameter '%s'\n",
					p);
2570 2571 2572 2573 2574
				goto out;
			}
			target->cmd_sg_cnt = token;
			break;

2575 2576
		case SRP_OPT_ALLOW_EXT_SG:
			if (match_int(args, &token)) {
2577
				pr_warn("bad allow_ext_sg parameter '%s'\n", p);
2578 2579 2580 2581 2582 2583 2584 2585
				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) {
2586 2587
				pr_warn("bad max sg_tablesize parameter '%s'\n",
					p);
2588 2589 2590 2591 2592
				goto out;
			}
			target->sg_tablesize = token;
			break;

2593 2594 2595 2596 2597 2598 2599 2600
		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;

2601 2602 2603 2604 2605 2606 2607 2608 2609
		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;

2610
		default:
2611 2612
			pr_warn("unknown parameter or missing value '%s' in target creation request\n",
				p);
2613 2614 2615 2616 2617 2618 2619 2620 2621 2622
			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))
2623 2624
				pr_warn("target creation request is missing parameter '%s'\n",
					srp_opt_tokens[i].pattern);
2625

2626 2627 2628 2629 2630 2631
	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);

2632 2633 2634 2635 2636
out:
	kfree(options);
	return ret;
}

2637 2638
static ssize_t srp_create_target(struct device *dev,
				 struct device_attribute *attr,
2639 2640 2641
				 const char *buf, size_t count)
{
	struct srp_host *host =
2642
		container_of(dev, struct srp_host, dev);
2643 2644
	struct Scsi_Host *target_host;
	struct srp_target_port *target;
2645
	struct ib_device *ibdev = host->srp_dev->dev;
2646
	int ret;
2647 2648 2649 2650 2651 2652

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

2653
	target_host->transportt  = ib_srp_transport_template;
2654 2655
	target_host->max_channel = 0;
	target_host->max_id      = 1;
A
Arne Redlich 已提交
2656 2657
	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
2658

2659 2660
	target = host_to_target(target_host);

2661 2662 2663 2664 2665 2666
	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;
2667 2668
	target->sg_tablesize	= indirect_sg_entries ? : cmd_sg_entries;
	target->allow_ext_sg	= allow_ext_sg;
2669
	target->tl_retry_count	= 7;
2670
	target->queue_size	= SRP_DEFAULT_QUEUE_SIZE;
2671

2672 2673
	mutex_lock(&host->add_target_mutex);

2674 2675 2676 2677
	ret = srp_parse_options(buf, target);
	if (ret)
		goto err;

2678 2679
	target->req_ring_size = target->queue_size - SRP_TSK_MGMT_SQ_SIZE;

2680 2681 2682 2683 2684 2685 2686 2687 2688 2689
	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;
	}

2690 2691
	if (!host->srp_dev->fmr_pool && !target->allow_ext_sg &&
				target->cmd_sg_cnt < target->sg_tablesize) {
2692
		pr_warn("No FMR pool and no external indirect descriptors, limiting sg_tablesize to cmd_sg_cnt\n");
2693 2694 2695 2696 2697 2698
		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);
2699 2700 2701 2702
	target->max_iu_len = sizeof (struct srp_cmd) +
			     sizeof (struct srp_indirect_buf) +
			     target->cmd_sg_cnt * sizeof (struct srp_direct_buf);

2703
	INIT_WORK(&target->tl_err_work, srp_tl_err_work);
2704
	INIT_WORK(&target->remove_work, srp_remove_work);
2705 2706
	spin_lock_init(&target->lock);
	INIT_LIST_HEAD(&target->free_tx);
2707 2708 2709
	ret = srp_alloc_req_data(target);
	if (ret)
		goto err_free_mem;
2710

2711 2712 2713
	ret = ib_query_gid(ibdev, host->port, 0, &target->path.sgid);
	if (ret)
		goto err_free_mem;
2714 2715 2716

	ret = srp_create_target_ib(target);
	if (ret)
2717
		goto err_free_mem;
2718

D
David Dillow 已提交
2719 2720
	ret = srp_new_cm_id(target);
	if (ret)
2721
		goto err_free_ib;
2722 2723 2724

	ret = srp_connect_target(target);
	if (ret) {
2725 2726
		shost_printk(KERN_ERR, target->scsi_host,
			     PFX "Connection failed\n");
2727 2728 2729 2730 2731 2732 2733
		goto err_cm_id;
	}

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

B
Bart Van Assche 已提交
2734 2735 2736 2737 2738 2739 2740 2741
	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);

2742 2743 2744 2745 2746
	ret = count;

out:
	mutex_unlock(&host->add_target_mutex);
	return ret;
2747 2748 2749 2750 2751 2752 2753

err_disconnect:
	srp_disconnect_target(target);

err_cm_id:
	ib_destroy_cm_id(target->cm_id);

2754
err_free_ib:
2755 2756
	srp_free_target_ib(target);

2757 2758 2759
err_free_mem:
	srp_free_req_data(target);

2760 2761
err:
	scsi_host_put(target_host);
2762
	goto out;
2763 2764
}

2765
static DEVICE_ATTR(add_target, S_IWUSR, NULL, srp_create_target);
2766

2767 2768
static ssize_t show_ibdev(struct device *dev, struct device_attribute *attr,
			  char *buf)
2769
{
2770
	struct srp_host *host = container_of(dev, struct srp_host, dev);
2771

2772
	return sprintf(buf, "%s\n", host->srp_dev->dev->name);
2773 2774
}

2775
static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
2776

2777 2778
static ssize_t show_port(struct device *dev, struct device_attribute *attr,
			 char *buf)
2779
{
2780
	struct srp_host *host = container_of(dev, struct srp_host, dev);
2781 2782 2783 2784

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

2785
static DEVICE_ATTR(port, S_IRUGO, show_port, NULL);
2786

2787
static struct srp_host *srp_add_port(struct srp_device *device, u8 port)
2788 2789 2790 2791 2792 2793 2794 2795
{
	struct srp_host *host;

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

	INIT_LIST_HEAD(&host->target_list);
2796
	spin_lock_init(&host->target_lock);
2797
	init_completion(&host->released);
2798
	mutex_init(&host->add_target_mutex);
2799
	host->srp_dev = device;
2800 2801
	host->port = port;

2802 2803
	host->dev.class = &srp_class;
	host->dev.parent = device->dev->dma_device;
2804
	dev_set_name(&host->dev, "srp-%s-%d", device->dev->name, port);
2805

2806
	if (device_register(&host->dev))
2807
		goto free_host;
2808
	if (device_create_file(&host->dev, &dev_attr_add_target))
2809
		goto err_class;
2810
	if (device_create_file(&host->dev, &dev_attr_ibdev))
2811
		goto err_class;
2812
	if (device_create_file(&host->dev, &dev_attr_port))
2813 2814 2815 2816 2817
		goto err_class;

	return host;

err_class:
2818
	device_unregister(&host->dev);
2819

2820
free_host:
2821 2822 2823 2824 2825 2826 2827
	kfree(host);

	return NULL;
}

static void srp_add_one(struct ib_device *device)
{
2828 2829 2830
	struct srp_device *srp_dev;
	struct ib_device_attr *dev_attr;
	struct ib_fmr_pool_param fmr_param;
2831
	struct srp_host *host;
2832
	int max_pages_per_fmr, fmr_page_shift, s, e, p;
2833

2834 2835
	dev_attr = kmalloc(sizeof *dev_attr, GFP_KERNEL);
	if (!dev_attr)
2836
		return;
2837

2838
	if (ib_query_device(device, dev_attr)) {
2839
		pr_warn("Query device failed for %s\n", device->name);
2840 2841 2842 2843 2844 2845 2846 2847 2848
		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
2849 2850
	 * minimum of 4096 bytes. We're unlikely to build large sglists
	 * out of smaller entries.
2851
	 */
2852 2853 2854 2855
	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;
2856 2857 2858 2859 2860 2861 2862 2863 2864 2865 2866 2867 2868 2869 2870

	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;

2871 2872 2873 2874 2875 2876 2877 2878 2879 2880 2881 2882 2883 2884 2885 2886 2887 2888
	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;
	}

2889 2890
	if (IS_ERR(srp_dev->fmr_pool))
		srp_dev->fmr_pool = NULL;
2891

T
Tom Tucker 已提交
2892
	if (device->node_type == RDMA_NODE_IB_SWITCH) {
2893 2894 2895 2896 2897 2898 2899 2900
		s = 0;
		e = 0;
	} else {
		s = 1;
		e = device->phys_port_cnt;
	}

	for (p = s; p <= e; ++p) {
2901
		host = srp_add_port(srp_dev, p);
2902
		if (host)
2903
			list_add_tail(&host->list, &srp_dev->dev_list);
2904 2905
	}

2906 2907 2908 2909 2910 2911 2912 2913 2914 2915 2916 2917
	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);
2918 2919 2920 2921
}

static void srp_remove_one(struct ib_device *device)
{
2922
	struct srp_device *srp_dev;
2923
	struct srp_host *host, *tmp_host;
2924
	struct srp_target_port *target;
2925

2926
	srp_dev = ib_get_client_data(device, &srp_client);
2927 2928
	if (!srp_dev)
		return;
2929

2930
	list_for_each_entry_safe(host, tmp_host, &srp_dev->dev_list, list) {
2931
		device_unregister(&host->dev);
2932 2933 2934 2935 2936 2937 2938
		/*
		 * Wait for the sysfs entry to go away, so that no new
		 * target ports can be created.
		 */
		wait_for_completion(&host->released);

		/*
2939
		 * Remove all target ports.
2940
		 */
2941
		spin_lock(&host->target_lock);
2942 2943
		list_for_each_entry(target, &host->target_list, list)
			srp_queue_remove_work(target);
2944
		spin_unlock(&host->target_lock);
2945 2946

		/*
2947
		 * Wait for target port removal tasks.
2948
		 */
2949
		flush_workqueue(system_long_wq);
2950 2951 2952 2953

		kfree(host);
	}

2954 2955 2956 2957 2958 2959
	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);
2960 2961
}

2962
static struct srp_function_template ib_srp_transport_functions = {
2963 2964
	.has_rport_state	 = true,
	.reset_timer_if_blocked	 = true,
2965
	.reconnect_delay	 = &srp_reconnect_delay,
2966 2967 2968
	.fast_io_fail_tmo	 = &srp_fast_io_fail_tmo,
	.dev_loss_tmo		 = &srp_dev_loss_tmo,
	.reconnect		 = srp_rport_reconnect,
2969
	.rport_delete		 = srp_rport_delete,
2970
	.terminate_rport_io	 = srp_terminate_io,
2971 2972
};

2973 2974 2975 2976
static int __init srp_init_module(void)
{
	int ret;

2977
	BUILD_BUG_ON(FIELD_SIZEOF(struct ib_wc, wr_id) < sizeof(void *));
2978

2979
	if (srp_sg_tablesize) {
2980
		pr_warn("srp_sg_tablesize is deprecated, please use cmd_sg_entries\n");
2981 2982 2983 2984 2985 2986 2987 2988
		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) {
2989
		pr_warn("Clamping cmd_sg_entries to 255\n");
2990
		cmd_sg_entries = 255;
2991 2992
	}

2993 2994 2995
	if (!indirect_sg_entries)
		indirect_sg_entries = cmd_sg_entries;
	else if (indirect_sg_entries < cmd_sg_entries) {
2996 2997
		pr_warn("Bumping up indirect_sg_entries to match cmd_sg_entries (%u)\n",
			cmd_sg_entries);
2998 2999 3000
		indirect_sg_entries = cmd_sg_entries;
	}

3001 3002 3003 3004 3005
	ib_srp_transport_template =
		srp_attach_transport(&ib_srp_transport_functions);
	if (!ib_srp_transport_template)
		return -ENOMEM;

3006 3007
	ret = class_register(&srp_class);
	if (ret) {
3008
		pr_err("couldn't register class infiniband_srp\n");
3009
		srp_release_transport(ib_srp_transport_template);
3010 3011 3012
		return ret;
	}

3013 3014
	ib_sa_register_client(&srp_sa_client);

3015 3016
	ret = ib_register_client(&srp_client);
	if (ret) {
3017
		pr_err("couldn't register IB client\n");
3018
		srp_release_transport(ib_srp_transport_template);
3019
		ib_sa_unregister_client(&srp_sa_client);
3020 3021 3022 3023 3024 3025 3026 3027 3028 3029
		class_unregister(&srp_class);
		return ret;
	}

	return 0;
}

static void __exit srp_cleanup_module(void)
{
	ib_unregister_client(&srp_client);
3030
	ib_sa_unregister_client(&srp_sa_client);
3031
	class_unregister(&srp_class);
3032
	srp_release_transport(ib_srp_transport_template);
3033 3034 3035 3036
}

module_init(srp_init_module);
module_exit(srp_cleanup_module);