ib_isert.c 91.3 KB
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/*******************************************************************************
 * This file contains iSCSI extentions for RDMA (iSER) Verbs
 *
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 * (c) Copyright 2013 Datera, Inc.
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 *
 * Nicholas A. Bellinger <nab@linux-iscsi.org>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 ****************************************************************************/

#include <linux/string.h>
#include <linux/module.h>
#include <linux/scatterlist.h>
#include <linux/socket.h>
#include <linux/in.h>
#include <linux/in6.h>
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#include <linux/llist.h>
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#include <rdma/ib_verbs.h>
#include <rdma/rdma_cm.h>
#include <target/target_core_base.h>
#include <target/target_core_fabric.h>
#include <target/iscsi/iscsi_transport.h>
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#include <linux/semaphore.h>
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#include "isert_proto.h"
#include "ib_isert.h"

#define	ISERT_MAX_CONN		8
#define ISER_MAX_RX_CQ_LEN	(ISERT_QP_MAX_RECV_DTOS * ISERT_MAX_CONN)
#define ISER_MAX_TX_CQ_LEN	(ISERT_QP_MAX_REQ_DTOS  * ISERT_MAX_CONN)

static DEFINE_MUTEX(device_list_mutex);
static LIST_HEAD(device_list);
static struct workqueue_struct *isert_rx_wq;
static struct workqueue_struct *isert_comp_wq;

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static void
isert_unmap_cmd(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn);
static int
isert_map_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
	       struct isert_rdma_wr *wr);
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static void
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isert_unreg_rdma(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn);
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static int
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isert_reg_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
	       struct isert_rdma_wr *wr);
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static int
isert_put_response(struct iscsi_conn *conn, struct iscsi_cmd *cmd);
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static void
isert_qp_event_callback(struct ib_event *e, void *context)
{
	struct isert_conn *isert_conn = (struct isert_conn *)context;

	pr_err("isert_qp_event_callback event: %d\n", e->event);
	switch (e->event) {
	case IB_EVENT_COMM_EST:
		rdma_notify(isert_conn->conn_cm_id, IB_EVENT_COMM_EST);
		break;
	case IB_EVENT_QP_LAST_WQE_REACHED:
		pr_warn("Reached TX IB_EVENT_QP_LAST_WQE_REACHED:\n");
		break;
	default:
		break;
	}
}

static int
isert_query_device(struct ib_device *ib_dev, struct ib_device_attr *devattr)
{
	int ret;

	ret = ib_query_device(ib_dev, devattr);
	if (ret) {
		pr_err("ib_query_device() failed: %d\n", ret);
		return ret;
	}
	pr_debug("devattr->max_sge: %d\n", devattr->max_sge);
	pr_debug("devattr->max_sge_rd: %d\n", devattr->max_sge_rd);

	return 0;
}

static int
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isert_conn_setup_qp(struct isert_conn *isert_conn, struct rdma_cm_id *cma_id,
		    u8 protection)
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{
	struct isert_device *device = isert_conn->conn_device;
	struct ib_qp_init_attr attr;
	int ret, index, min_index = 0;

	mutex_lock(&device_list_mutex);
	for (index = 0; index < device->cqs_used; index++)
		if (device->cq_active_qps[index] <
		    device->cq_active_qps[min_index])
			min_index = index;
	device->cq_active_qps[min_index]++;
	pr_debug("isert_conn_setup_qp: Using min_index: %d\n", min_index);
	mutex_unlock(&device_list_mutex);

	memset(&attr, 0, sizeof(struct ib_qp_init_attr));
	attr.event_handler = isert_qp_event_callback;
	attr.qp_context = isert_conn;
	attr.send_cq = device->dev_tx_cq[min_index];
	attr.recv_cq = device->dev_rx_cq[min_index];
	attr.cap.max_send_wr = ISERT_QP_MAX_REQ_DTOS;
	attr.cap.max_recv_wr = ISERT_QP_MAX_RECV_DTOS;
	/*
	 * FIXME: Use devattr.max_sge - 2 for max_send_sge as
	 * work-around for RDMA_READ..
	 */
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	attr.cap.max_send_sge = device->dev_attr.max_sge - 2;
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	isert_conn->max_sge = attr.cap.max_send_sge;

	attr.cap.max_recv_sge = 1;
	attr.sq_sig_type = IB_SIGNAL_REQ_WR;
	attr.qp_type = IB_QPT_RC;
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	if (protection)
		attr.create_flags |= IB_QP_CREATE_SIGNATURE_EN;
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	pr_debug("isert_conn_setup_qp cma_id->device: %p\n",
		 cma_id->device);
	pr_debug("isert_conn_setup_qp conn_pd->device: %p\n",
		 isert_conn->conn_pd->device);

	ret = rdma_create_qp(cma_id, isert_conn->conn_pd, &attr);
	if (ret) {
		pr_err("rdma_create_qp failed for cma_id %d\n", ret);
		return ret;
	}
	isert_conn->conn_qp = cma_id->qp;
	pr_debug("rdma_create_qp() returned success >>>>>>>>>>>>>>>>>>>>>>>>>.\n");

	return 0;
}

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

static int
isert_alloc_rx_descriptors(struct isert_conn *isert_conn)
{
	struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
	struct iser_rx_desc *rx_desc;
	struct ib_sge *rx_sg;
	u64 dma_addr;
	int i, j;

	isert_conn->conn_rx_descs = kzalloc(ISERT_QP_MAX_RECV_DTOS *
				sizeof(struct iser_rx_desc), GFP_KERNEL);
	if (!isert_conn->conn_rx_descs)
		goto fail;

	rx_desc = isert_conn->conn_rx_descs;

	for (i = 0; i < ISERT_QP_MAX_RECV_DTOS; i++, rx_desc++)  {
		dma_addr = ib_dma_map_single(ib_dev, (void *)rx_desc,
					ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
		if (ib_dma_mapping_error(ib_dev, dma_addr))
			goto dma_map_fail;

		rx_desc->dma_addr = dma_addr;

		rx_sg = &rx_desc->rx_sg;
		rx_sg->addr = rx_desc->dma_addr;
		rx_sg->length = ISER_RX_PAYLOAD_SIZE;
		rx_sg->lkey = isert_conn->conn_mr->lkey;
	}

	isert_conn->conn_rx_desc_head = 0;
	return 0;

dma_map_fail:
	rx_desc = isert_conn->conn_rx_descs;
	for (j = 0; j < i; j++, rx_desc++) {
		ib_dma_unmap_single(ib_dev, rx_desc->dma_addr,
				    ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
	}
	kfree(isert_conn->conn_rx_descs);
	isert_conn->conn_rx_descs = NULL;
fail:
	return -ENOMEM;
}

static void
isert_free_rx_descriptors(struct isert_conn *isert_conn)
{
	struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
	struct iser_rx_desc *rx_desc;
	int i;

	if (!isert_conn->conn_rx_descs)
		return;

	rx_desc = isert_conn->conn_rx_descs;
	for (i = 0; i < ISERT_QP_MAX_RECV_DTOS; i++, rx_desc++)  {
		ib_dma_unmap_single(ib_dev, rx_desc->dma_addr,
				    ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
	}

	kfree(isert_conn->conn_rx_descs);
	isert_conn->conn_rx_descs = NULL;
}

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static void isert_cq_tx_work(struct work_struct *);
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static void isert_cq_tx_callback(struct ib_cq *, void *);
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static void isert_cq_rx_work(struct work_struct *);
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static void isert_cq_rx_callback(struct ib_cq *, void *);

static int
isert_create_device_ib_res(struct isert_device *device)
{
	struct ib_device *ib_dev = device->ib_device;
	struct isert_cq_desc *cq_desc;
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	struct ib_device_attr *dev_attr;
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	int ret = 0, i, j;

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	dev_attr = &device->dev_attr;
	ret = isert_query_device(ib_dev, dev_attr);
	if (ret)
		return ret;

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	/* asign function handlers */
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	if (dev_attr->device_cap_flags & IB_DEVICE_MEM_MGT_EXTENSIONS &&
	    dev_attr->device_cap_flags & IB_DEVICE_SIGNATURE_HANDOVER) {
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		device->use_fastreg = 1;
		device->reg_rdma_mem = isert_reg_rdma;
		device->unreg_rdma_mem = isert_unreg_rdma;
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	} else {
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		device->use_fastreg = 0;
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		device->reg_rdma_mem = isert_map_rdma;
		device->unreg_rdma_mem = isert_unmap_cmd;
	}
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	/* Check signature cap */
	device->pi_capable = dev_attr->device_cap_flags &
			     IB_DEVICE_SIGNATURE_HANDOVER ? true : false;

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	device->cqs_used = min_t(int, num_online_cpus(),
				 device->ib_device->num_comp_vectors);
	device->cqs_used = min(ISERT_MAX_CQ, device->cqs_used);
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	pr_debug("Using %d CQs, device %s supports %d vectors support "
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		 "Fast registration %d pi_capable %d\n",
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		 device->cqs_used, device->ib_device->name,
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		 device->ib_device->num_comp_vectors, device->use_fastreg,
		 device->pi_capable);
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	device->cq_desc = kzalloc(sizeof(struct isert_cq_desc) *
				device->cqs_used, GFP_KERNEL);
	if (!device->cq_desc) {
		pr_err("Unable to allocate device->cq_desc\n");
		return -ENOMEM;
	}
	cq_desc = device->cq_desc;

	for (i = 0; i < device->cqs_used; i++) {
		cq_desc[i].device = device;
		cq_desc[i].cq_index = i;

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		INIT_WORK(&cq_desc[i].cq_rx_work, isert_cq_rx_work);
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		device->dev_rx_cq[i] = ib_create_cq(device->ib_device,
						isert_cq_rx_callback,
						isert_cq_event_callback,
						(void *)&cq_desc[i],
						ISER_MAX_RX_CQ_LEN, i);
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		if (IS_ERR(device->dev_rx_cq[i])) {
			ret = PTR_ERR(device->dev_rx_cq[i]);
			device->dev_rx_cq[i] = NULL;
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			goto out_cq;
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		}
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		INIT_WORK(&cq_desc[i].cq_tx_work, isert_cq_tx_work);
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		device->dev_tx_cq[i] = ib_create_cq(device->ib_device,
						isert_cq_tx_callback,
						isert_cq_event_callback,
						(void *)&cq_desc[i],
						ISER_MAX_TX_CQ_LEN, i);
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		if (IS_ERR(device->dev_tx_cq[i])) {
			ret = PTR_ERR(device->dev_tx_cq[i]);
			device->dev_tx_cq[i] = NULL;
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			goto out_cq;
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		}
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		ret = ib_req_notify_cq(device->dev_rx_cq[i], IB_CQ_NEXT_COMP);
		if (ret)
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			goto out_cq;

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		ret = ib_req_notify_cq(device->dev_tx_cq[i], IB_CQ_NEXT_COMP);
		if (ret)
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			goto out_cq;
	}

	return 0;

out_cq:
	for (j = 0; j < i; j++) {
		cq_desc = &device->cq_desc[j];

		if (device->dev_rx_cq[j]) {
			cancel_work_sync(&cq_desc->cq_rx_work);
			ib_destroy_cq(device->dev_rx_cq[j]);
		}
		if (device->dev_tx_cq[j]) {
			cancel_work_sync(&cq_desc->cq_tx_work);
			ib_destroy_cq(device->dev_tx_cq[j]);
		}
	}
	kfree(device->cq_desc);

	return ret;
}

static void
isert_free_device_ib_res(struct isert_device *device)
{
	struct isert_cq_desc *cq_desc;
	int i;

	for (i = 0; i < device->cqs_used; i++) {
		cq_desc = &device->cq_desc[i];

		cancel_work_sync(&cq_desc->cq_rx_work);
		cancel_work_sync(&cq_desc->cq_tx_work);
		ib_destroy_cq(device->dev_rx_cq[i]);
		ib_destroy_cq(device->dev_tx_cq[i]);
		device->dev_rx_cq[i] = NULL;
		device->dev_tx_cq[i] = NULL;
	}

	kfree(device->cq_desc);
}

static void
isert_device_try_release(struct isert_device *device)
{
	mutex_lock(&device_list_mutex);
	device->refcount--;
	if (!device->refcount) {
		isert_free_device_ib_res(device);
		list_del(&device->dev_node);
		kfree(device);
	}
	mutex_unlock(&device_list_mutex);
}

static struct isert_device *
isert_device_find_by_ib_dev(struct rdma_cm_id *cma_id)
{
	struct isert_device *device;
	int ret;

	mutex_lock(&device_list_mutex);
	list_for_each_entry(device, &device_list, dev_node) {
		if (device->ib_device->node_guid == cma_id->device->node_guid) {
			device->refcount++;
			mutex_unlock(&device_list_mutex);
			return device;
		}
	}

	device = kzalloc(sizeof(struct isert_device), GFP_KERNEL);
	if (!device) {
		mutex_unlock(&device_list_mutex);
		return ERR_PTR(-ENOMEM);
	}

	INIT_LIST_HEAD(&device->dev_node);

	device->ib_device = cma_id->device;
	ret = isert_create_device_ib_res(device);
	if (ret) {
		kfree(device);
		mutex_unlock(&device_list_mutex);
		return ERR_PTR(ret);
	}

	device->refcount++;
	list_add_tail(&device->dev_node, &device_list);
	mutex_unlock(&device_list_mutex);

	return device;
}

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static void
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isert_conn_free_fastreg_pool(struct isert_conn *isert_conn)
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{
	struct fast_reg_descriptor *fr_desc, *tmp;
	int i = 0;

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	if (list_empty(&isert_conn->conn_fr_pool))
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		return;

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	pr_debug("Freeing conn %p fastreg pool", isert_conn);
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	list_for_each_entry_safe(fr_desc, tmp,
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				 &isert_conn->conn_fr_pool, list) {
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		list_del(&fr_desc->list);
		ib_free_fast_reg_page_list(fr_desc->data_frpl);
		ib_dereg_mr(fr_desc->data_mr);
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		if (fr_desc->pi_ctx) {
			ib_free_fast_reg_page_list(fr_desc->pi_ctx->prot_frpl);
			ib_dereg_mr(fr_desc->pi_ctx->prot_mr);
			ib_destroy_mr(fr_desc->pi_ctx->sig_mr);
			kfree(fr_desc->pi_ctx);
		}
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		kfree(fr_desc);
		++i;
	}

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	if (i < isert_conn->conn_fr_pool_size)
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		pr_warn("Pool still has %d regions registered\n",
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			isert_conn->conn_fr_pool_size - i);
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}

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static int
isert_create_fr_desc(struct ib_device *ib_device, struct ib_pd *pd,
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		     struct fast_reg_descriptor *fr_desc, u8 protection)
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{
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	int ret;

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	fr_desc->data_frpl = ib_alloc_fast_reg_page_list(ib_device,
							 ISCSI_ISER_SG_TABLESIZE);
	if (IS_ERR(fr_desc->data_frpl)) {
		pr_err("Failed to allocate data frpl err=%ld\n",
		       PTR_ERR(fr_desc->data_frpl));
		return PTR_ERR(fr_desc->data_frpl);
	}

	fr_desc->data_mr = ib_alloc_fast_reg_mr(pd, ISCSI_ISER_SG_TABLESIZE);
	if (IS_ERR(fr_desc->data_mr)) {
		pr_err("Failed to allocate data frmr err=%ld\n",
		       PTR_ERR(fr_desc->data_mr));
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		ret = PTR_ERR(fr_desc->data_mr);
		goto err_data_frpl;
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	}
	pr_debug("Create fr_desc %p page_list %p\n",
		 fr_desc, fr_desc->data_frpl->page_list);
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	fr_desc->ind |= ISERT_DATA_KEY_VALID;

	if (protection) {
		struct ib_mr_init_attr mr_init_attr = {0};
		struct pi_context *pi_ctx;

		fr_desc->pi_ctx = kzalloc(sizeof(*fr_desc->pi_ctx), GFP_KERNEL);
		if (!fr_desc->pi_ctx) {
			pr_err("Failed to allocate pi context\n");
			ret = -ENOMEM;
			goto err_data_mr;
		}
		pi_ctx = fr_desc->pi_ctx;

		pi_ctx->prot_frpl = ib_alloc_fast_reg_page_list(ib_device,
						    ISCSI_ISER_SG_TABLESIZE);
		if (IS_ERR(pi_ctx->prot_frpl)) {
			pr_err("Failed to allocate prot frpl err=%ld\n",
			       PTR_ERR(pi_ctx->prot_frpl));
			ret = PTR_ERR(pi_ctx->prot_frpl);
			goto err_pi_ctx;
		}
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		pi_ctx->prot_mr = ib_alloc_fast_reg_mr(pd, ISCSI_ISER_SG_TABLESIZE);
		if (IS_ERR(pi_ctx->prot_mr)) {
			pr_err("Failed to allocate prot frmr err=%ld\n",
			       PTR_ERR(pi_ctx->prot_mr));
			ret = PTR_ERR(pi_ctx->prot_mr);
			goto err_prot_frpl;
		}
		fr_desc->ind |= ISERT_PROT_KEY_VALID;

		mr_init_attr.max_reg_descriptors = 2;
		mr_init_attr.flags |= IB_MR_SIGNATURE_EN;
		pi_ctx->sig_mr = ib_create_mr(pd, &mr_init_attr);
		if (IS_ERR(pi_ctx->sig_mr)) {
			pr_err("Failed to allocate signature enabled mr err=%ld\n",
			       PTR_ERR(pi_ctx->sig_mr));
			ret = PTR_ERR(pi_ctx->sig_mr);
			goto err_prot_mr;
		}
		fr_desc->ind |= ISERT_SIG_KEY_VALID;
	}
	fr_desc->ind &= ~ISERT_PROTECTED;
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	return 0;
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err_prot_mr:
	ib_dereg_mr(fr_desc->pi_ctx->prot_mr);
err_prot_frpl:
	ib_free_fast_reg_page_list(fr_desc->pi_ctx->prot_frpl);
err_pi_ctx:
	kfree(fr_desc->pi_ctx);
err_data_mr:
	ib_dereg_mr(fr_desc->data_mr);
err_data_frpl:
	ib_free_fast_reg_page_list(fr_desc->data_frpl);

	return ret;
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}

static int
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isert_conn_create_fastreg_pool(struct isert_conn *isert_conn, u8 pi_support)
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{
	struct fast_reg_descriptor *fr_desc;
	struct isert_device *device = isert_conn->conn_device;
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	struct se_session *se_sess = isert_conn->conn->sess->se_sess;
	struct se_node_acl *se_nacl = se_sess->se_node_acl;
	int i, ret, tag_num;
	/*
	 * Setup the number of FRMRs based upon the number of tags
	 * available to session in iscsi_target_locate_portal().
	 */
	tag_num = max_t(u32, ISCSIT_MIN_TAGS, se_nacl->queue_depth);
	tag_num = (tag_num * 2) + ISCSIT_EXTRA_TAGS;
522

523
	isert_conn->conn_fr_pool_size = 0;
524
	for (i = 0; i < tag_num; i++) {
525
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527
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529
530
531
		fr_desc = kzalloc(sizeof(*fr_desc), GFP_KERNEL);
		if (!fr_desc) {
			pr_err("Failed to allocate fast_reg descriptor\n");
			ret = -ENOMEM;
			goto err;
		}

532
		ret = isert_create_fr_desc(device->ib_device,
533
534
					   isert_conn->conn_pd, fr_desc,
					   pi_support);
535
536
537
		if (ret) {
			pr_err("Failed to create fastreg descriptor err=%d\n",
			       ret);
538
			kfree(fr_desc);
539
540
541
			goto err;
		}

542
543
		list_add_tail(&fr_desc->list, &isert_conn->conn_fr_pool);
		isert_conn->conn_fr_pool_size++;
544
545
	}

546
547
	pr_debug("Creating conn %p fastreg pool size=%d",
		 isert_conn, isert_conn->conn_fr_pool_size);
548
549
550
551

	return 0;

err:
552
	isert_conn_free_fastreg_pool(isert_conn);
553
554
555
	return ret;
}

556
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562
563
564
static int
isert_connect_request(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
{
	struct iscsi_np *np = cma_id->context;
	struct isert_np *isert_np = np->np_context;
	struct isert_conn *isert_conn;
	struct isert_device *device;
	struct ib_device *ib_dev = cma_id->device;
	int ret = 0;
565
566
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572
573
	u8 pi_support;

	spin_lock_bh(&np->np_thread_lock);
	if (!np->enabled) {
		spin_unlock_bh(&np->np_thread_lock);
		pr_debug("iscsi_np is not enabled, reject connect request\n");
		return rdma_reject(cma_id, NULL, 0);
	}
	spin_unlock_bh(&np->np_thread_lock);
574
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576
577
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579
580
581
582
583
584
585

	pr_debug("Entering isert_connect_request cma_id: %p, context: %p\n",
		 cma_id, cma_id->context);

	isert_conn = kzalloc(sizeof(struct isert_conn), GFP_KERNEL);
	if (!isert_conn) {
		pr_err("Unable to allocate isert_conn\n");
		return -ENOMEM;
	}
	isert_conn->state = ISER_CONN_INIT;
	INIT_LIST_HEAD(&isert_conn->conn_accept_node);
	init_completion(&isert_conn->conn_login_comp);
586
587
	init_completion(&isert_conn->conn_wait);
	init_completion(&isert_conn->conn_wait_comp_err);
588
589
	kref_init(&isert_conn->conn_kref);
	kref_get(&isert_conn->conn_kref);
590
	mutex_init(&isert_conn->conn_mutex);
591
	spin_lock_init(&isert_conn->conn_lock);
592
	INIT_LIST_HEAD(&isert_conn->conn_fr_pool);
593
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645
646

	cma_id->context = isert_conn;
	isert_conn->conn_cm_id = cma_id;
	isert_conn->responder_resources = event->param.conn.responder_resources;
	isert_conn->initiator_depth = event->param.conn.initiator_depth;
	pr_debug("Using responder_resources: %u initiator_depth: %u\n",
		 isert_conn->responder_resources, isert_conn->initiator_depth);

	isert_conn->login_buf = kzalloc(ISCSI_DEF_MAX_RECV_SEG_LEN +
					ISER_RX_LOGIN_SIZE, GFP_KERNEL);
	if (!isert_conn->login_buf) {
		pr_err("Unable to allocate isert_conn->login_buf\n");
		ret = -ENOMEM;
		goto out;
	}

	isert_conn->login_req_buf = isert_conn->login_buf;
	isert_conn->login_rsp_buf = isert_conn->login_buf +
				    ISCSI_DEF_MAX_RECV_SEG_LEN;
	pr_debug("Set login_buf: %p login_req_buf: %p login_rsp_buf: %p\n",
		 isert_conn->login_buf, isert_conn->login_req_buf,
		 isert_conn->login_rsp_buf);

	isert_conn->login_req_dma = ib_dma_map_single(ib_dev,
				(void *)isert_conn->login_req_buf,
				ISCSI_DEF_MAX_RECV_SEG_LEN, DMA_FROM_DEVICE);

	ret = ib_dma_mapping_error(ib_dev, isert_conn->login_req_dma);
	if (ret) {
		pr_err("ib_dma_mapping_error failed for login_req_dma: %d\n",
		       ret);
		isert_conn->login_req_dma = 0;
		goto out_login_buf;
	}

	isert_conn->login_rsp_dma = ib_dma_map_single(ib_dev,
					(void *)isert_conn->login_rsp_buf,
					ISER_RX_LOGIN_SIZE, DMA_TO_DEVICE);

	ret = ib_dma_mapping_error(ib_dev, isert_conn->login_rsp_dma);
	if (ret) {
		pr_err("ib_dma_mapping_error failed for login_rsp_dma: %d\n",
		       ret);
		isert_conn->login_rsp_dma = 0;
		goto out_req_dma_map;
	}

	device = isert_device_find_by_ib_dev(cma_id);
	if (IS_ERR(device)) {
		ret = PTR_ERR(device);
		goto out_rsp_dma_map;
	}

	isert_conn->conn_device = device;
647
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649
650
651
652
653
	isert_conn->conn_pd = ib_alloc_pd(isert_conn->conn_device->ib_device);
	if (IS_ERR(isert_conn->conn_pd)) {
		ret = PTR_ERR(isert_conn->conn_pd);
		pr_err("ib_alloc_pd failed for conn %p: ret=%d\n",
		       isert_conn, ret);
		goto out_pd;
	}
654

655
656
657
658
659
660
661
662
	isert_conn->conn_mr = ib_get_dma_mr(isert_conn->conn_pd,
					   IB_ACCESS_LOCAL_WRITE);
	if (IS_ERR(isert_conn->conn_mr)) {
		ret = PTR_ERR(isert_conn->conn_mr);
		pr_err("ib_get_dma_mr failed for conn %p: ret=%d\n",
		       isert_conn, ret);
		goto out_mr;
	}
663

664
	pi_support = np->tpg_np->tpg->tpg_attrib.t10_pi;
665
666
667
668
669
670
671
	if (pi_support && !device->pi_capable) {
		pr_err("Protection information requested but not supported\n");
		ret = -EINVAL;
		goto out_mr;
	}

	ret = isert_conn_setup_qp(isert_conn, cma_id, pi_support);
672
673
674
675
	if (ret)
		goto out_conn_dev;

	mutex_lock(&isert_np->np_accept_mutex);
676
	list_add_tail(&isert_conn->conn_accept_node, &isert_np->np_accept_list);
677
678
	mutex_unlock(&isert_np->np_accept_mutex);

679
680
	pr_debug("isert_connect_request() up np_sem np: %p\n", np);
	up(&isert_np->np_sem);
681
682
683
	return 0;

out_conn_dev:
684
685
686
687
	ib_dereg_mr(isert_conn->conn_mr);
out_mr:
	ib_dealloc_pd(isert_conn->conn_pd);
out_pd:
688
689
690
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694
695
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697
698
699
700
701
702
703
704
705
706
707
708
709
710
	isert_device_try_release(device);
out_rsp_dma_map:
	ib_dma_unmap_single(ib_dev, isert_conn->login_rsp_dma,
			    ISER_RX_LOGIN_SIZE, DMA_TO_DEVICE);
out_req_dma_map:
	ib_dma_unmap_single(ib_dev, isert_conn->login_req_dma,
			    ISCSI_DEF_MAX_RECV_SEG_LEN, DMA_FROM_DEVICE);
out_login_buf:
	kfree(isert_conn->login_buf);
out:
	kfree(isert_conn);
	return ret;
}

static void
isert_connect_release(struct isert_conn *isert_conn)
{
	struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
	struct isert_device *device = isert_conn->conn_device;
	int cq_index;

	pr_debug("Entering isert_connect_release(): >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n");

711
712
	if (device && device->use_fastreg)
		isert_conn_free_fastreg_pool(isert_conn);
713

714
715
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718
719
720
721
722
723
724
725
	if (isert_conn->conn_qp) {
		cq_index = ((struct isert_cq_desc *)
			isert_conn->conn_qp->recv_cq->cq_context)->cq_index;
		pr_debug("isert_connect_release: cq_index: %d\n", cq_index);
		isert_conn->conn_device->cq_active_qps[cq_index]--;

		rdma_destroy_qp(isert_conn->conn_cm_id);
	}

	isert_free_rx_descriptors(isert_conn);
	rdma_destroy_id(isert_conn->conn_cm_id);

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728
	ib_dereg_mr(isert_conn->conn_mr);
	ib_dealloc_pd(isert_conn->conn_pd);

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	if (isert_conn->login_buf) {
		ib_dma_unmap_single(ib_dev, isert_conn->login_rsp_dma,
				    ISER_RX_LOGIN_SIZE, DMA_TO_DEVICE);
		ib_dma_unmap_single(ib_dev, isert_conn->login_req_dma,
				    ISCSI_DEF_MAX_RECV_SEG_LEN,
				    DMA_FROM_DEVICE);
		kfree(isert_conn->login_buf);
	}
	kfree(isert_conn);

	if (device)
		isert_device_try_release(device);

	pr_debug("Leaving isert_connect_release >>>>>>>>>>>>\n");
}

static void
isert_connected_handler(struct rdma_cm_id *cma_id)
{
	return;
}

static void
isert_release_conn_kref(struct kref *kref)
{
	struct isert_conn *isert_conn = container_of(kref,
				struct isert_conn, conn_kref);

	pr_debug("Calling isert_connect_release for final kref %s/%d\n",
		 current->comm, current->pid);

	isert_connect_release(isert_conn);
}

static void
isert_put_conn(struct isert_conn *isert_conn)
{
	kref_put(&isert_conn->conn_kref, isert_release_conn_kref);
}

static void
isert_disconnect_work(struct work_struct *work)
{
	struct isert_conn *isert_conn = container_of(work,
				struct isert_conn, conn_logout_work);

	pr_debug("isert_disconnect_work(): >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n");
776
	mutex_lock(&isert_conn->conn_mutex);
777
778
	if (isert_conn->state == ISER_CONN_UP)
		isert_conn->state = ISER_CONN_TERMINATING;
779
780
781

	if (isert_conn->post_recv_buf_count == 0 &&
	    atomic_read(&isert_conn->post_send_buf_count) == 0) {
782
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784
785
786
787
788
		mutex_unlock(&isert_conn->conn_mutex);
		goto wake_up;
	}
	if (!isert_conn->conn_cm_id) {
		mutex_unlock(&isert_conn->conn_mutex);
		isert_put_conn(isert_conn);
		return;
789
	}
790
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792
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795
796
	if (!isert_conn->logout_posted) {
		pr_debug("Calling rdma_disconnect for !logout_posted from"
			 " isert_disconnect_work\n");
		rdma_disconnect(isert_conn->conn_cm_id);
		mutex_unlock(&isert_conn->conn_mutex);
		iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
		goto wake_up;
797
	}
798
	mutex_unlock(&isert_conn->conn_mutex);
799

800
wake_up:
801
	complete(&isert_conn->conn_wait);
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	isert_put_conn(isert_conn);
}

static void
isert_disconnected_handler(struct rdma_cm_id *cma_id)
{
	struct isert_conn *isert_conn = (struct isert_conn *)cma_id->context;

	INIT_WORK(&isert_conn->conn_logout_work, isert_disconnect_work);
	schedule_work(&isert_conn->conn_logout_work);
}

static int
isert_cma_handler(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
{
	int ret = 0;

	pr_debug("isert_cma_handler: event %d status %d conn %p id %p\n",
		 event->event, event->status, cma_id->context, cma_id);

	switch (event->event) {
	case RDMA_CM_EVENT_CONNECT_REQUEST:
		pr_debug("RDMA_CM_EVENT_CONNECT_REQUEST: >>>>>>>>>>>>>>>\n");
		ret = isert_connect_request(cma_id, event);
		break;
	case RDMA_CM_EVENT_ESTABLISHED:
		pr_debug("RDMA_CM_EVENT_ESTABLISHED >>>>>>>>>>>>>>\n");
		isert_connected_handler(cma_id);
		break;
	case RDMA_CM_EVENT_DISCONNECTED:
		pr_debug("RDMA_CM_EVENT_DISCONNECTED: >>>>>>>>>>>>>>\n");
		isert_disconnected_handler(cma_id);
		break;
	case RDMA_CM_EVENT_DEVICE_REMOVAL:
	case RDMA_CM_EVENT_ADDR_CHANGE:
		break;
	case RDMA_CM_EVENT_CONNECT_ERROR:
	default:
		pr_err("Unknown RDMA CMA event: %d\n", event->event);
		break;
	}

	if (ret != 0) {
		pr_err("isert_cma_handler failed RDMA_CM_EVENT: 0x%08x %d\n",
		       event->event, ret);
		dump_stack();
	}

	return ret;
}

static int
isert_post_recv(struct isert_conn *isert_conn, u32 count)
{
	struct ib_recv_wr *rx_wr, *rx_wr_failed;
	int i, ret;
	unsigned int rx_head = isert_conn->conn_rx_desc_head;
	struct iser_rx_desc *rx_desc;

	for (rx_wr = isert_conn->conn_rx_wr, i = 0; i < count; i++, rx_wr++) {
		rx_desc		= &isert_conn->conn_rx_descs[rx_head];
		rx_wr->wr_id	= (unsigned long)rx_desc;
		rx_wr->sg_list	= &rx_desc->rx_sg;
		rx_wr->num_sge	= 1;
		rx_wr->next	= rx_wr + 1;
		rx_head = (rx_head + 1) & (ISERT_QP_MAX_RECV_DTOS - 1);
	}

	rx_wr--;
	rx_wr->next = NULL; /* mark end of work requests list */

	isert_conn->post_recv_buf_count += count;
	ret = ib_post_recv(isert_conn->conn_qp, isert_conn->conn_rx_wr,
				&rx_wr_failed);
	if (ret) {
		pr_err("ib_post_recv() failed with ret: %d\n", ret);
		isert_conn->post_recv_buf_count -= count;
	} else {
		pr_debug("isert_post_recv(): Posted %d RX buffers\n", count);
		isert_conn->conn_rx_desc_head = rx_head;
	}
	return ret;
}

static int
isert_post_send(struct isert_conn *isert_conn, struct iser_tx_desc *tx_desc)
{
	struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
	struct ib_send_wr send_wr, *send_wr_failed;
	int ret;

	ib_dma_sync_single_for_device(ib_dev, tx_desc->dma_addr,
				      ISER_HEADERS_LEN, DMA_TO_DEVICE);

	send_wr.next	= NULL;
	send_wr.wr_id	= (unsigned long)tx_desc;
	send_wr.sg_list	= tx_desc->tx_sg;
	send_wr.num_sge	= tx_desc->num_sge;
	send_wr.opcode	= IB_WR_SEND;
	send_wr.send_flags = IB_SEND_SIGNALED;

	atomic_inc(&isert_conn->post_send_buf_count);

	ret = ib_post_send(isert_conn->conn_qp, &send_wr, &send_wr_failed);
	if (ret) {
		pr_err("ib_post_send() failed, ret: %d\n", ret);
		atomic_dec(&isert_conn->post_send_buf_count);
	}

	return ret;
}

static void
isert_create_send_desc(struct isert_conn *isert_conn,
		       struct isert_cmd *isert_cmd,
		       struct iser_tx_desc *tx_desc)
{
	struct ib_device *ib_dev = isert_conn->conn_cm_id->device;

	ib_dma_sync_single_for_cpu(ib_dev, tx_desc->dma_addr,
				   ISER_HEADERS_LEN, DMA_TO_DEVICE);

	memset(&tx_desc->iser_header, 0, sizeof(struct iser_hdr));
	tx_desc->iser_header.flags = ISER_VER;

	tx_desc->num_sge = 1;
	tx_desc->isert_cmd = isert_cmd;

	if (tx_desc->tx_sg[0].lkey != isert_conn->conn_mr->lkey) {
		tx_desc->tx_sg[0].lkey = isert_conn->conn_mr->lkey;
		pr_debug("tx_desc %p lkey mismatch, fixing\n", tx_desc);
	}
}

static int
isert_init_tx_hdrs(struct isert_conn *isert_conn,
		   struct iser_tx_desc *tx_desc)
{
	struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
	u64 dma_addr;

	dma_addr = ib_dma_map_single(ib_dev, (void *)tx_desc,
			ISER_HEADERS_LEN, DMA_TO_DEVICE);
	if (ib_dma_mapping_error(ib_dev, dma_addr)) {
		pr_err("ib_dma_mapping_error() failed\n");
		return -ENOMEM;
	}

	tx_desc->dma_addr = dma_addr;
	tx_desc->tx_sg[0].addr	= tx_desc->dma_addr;
	tx_desc->tx_sg[0].length = ISER_HEADERS_LEN;
	tx_desc->tx_sg[0].lkey = isert_conn->conn_mr->lkey;

	pr_debug("isert_init_tx_hdrs: Setup tx_sg[0].addr: 0x%llx length: %u"
		 " lkey: 0x%08x\n", tx_desc->tx_sg[0].addr,
		 tx_desc->tx_sg[0].length, tx_desc->tx_sg[0].lkey);

	return 0;
}

static void
963
964
isert_init_send_wr(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
		   struct ib_send_wr *send_wr, bool coalesce)
965
{
966
967
	struct iser_tx_desc *tx_desc = &isert_cmd->tx_desc;

968
969
970
	isert_cmd->rdma_wr.iser_ib_op = ISER_IB_SEND;
	send_wr->wr_id = (unsigned long)&isert_cmd->tx_desc;
	send_wr->opcode = IB_WR_SEND;
971
	send_wr->sg_list = &tx_desc->tx_sg[0];
972
	send_wr->num_sge = isert_cmd->tx_desc.num_sge;
973
974
975
976
	/*
	 * Coalesce send completion interrupts by only setting IB_SEND_SIGNALED
	 * bit for every ISERT_COMP_BATCH_COUNT number of ib_post_send() calls.
	 */
977
978
	mutex_lock(&isert_conn->conn_mutex);
	if (coalesce && isert_conn->state == ISER_CONN_UP &&
979
	    ++isert_conn->conn_comp_batch < ISERT_COMP_BATCH_COUNT) {
980
		tx_desc->llnode_active = true;
981
		llist_add(&tx_desc->comp_llnode, &isert_conn->conn_comp_llist);
982
		mutex_unlock(&isert_conn->conn_mutex);
983
984
985
986
		return;
	}
	isert_conn->conn_comp_batch = 0;
	tx_desc->comp_llnode_batch = llist_del_all(&isert_conn->conn_comp_llist);
987
	mutex_unlock(&isert_conn->conn_mutex);
988
989

	send_wr->send_flags = IB_SEND_SIGNALED;
990
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1056
}

static int
isert_rdma_post_recvl(struct isert_conn *isert_conn)
{
	struct ib_recv_wr rx_wr, *rx_wr_fail;
	struct ib_sge sge;
	int ret;

	memset(&sge, 0, sizeof(struct ib_sge));
	sge.addr = isert_conn->login_req_dma;
	sge.length = ISER_RX_LOGIN_SIZE;
	sge.lkey = isert_conn->conn_mr->lkey;

	pr_debug("Setup sge: addr: %llx length: %d 0x%08x\n",
		sge.addr, sge.length, sge.lkey);

	memset(&rx_wr, 0, sizeof(struct ib_recv_wr));
	rx_wr.wr_id = (unsigned long)isert_conn->login_req_buf;
	rx_wr.sg_list = &sge;
	rx_wr.num_sge = 1;

	isert_conn->post_recv_buf_count++;
	ret = ib_post_recv(isert_conn->conn_qp, &rx_wr, &rx_wr_fail);
	if (ret) {
		pr_err("ib_post_recv() failed: %d\n", ret);
		isert_conn->post_recv_buf_count--;
	}

	pr_debug("ib_post_recv(): returned success >>>>>>>>>>>>>>>>>>>>>>>>\n");
	return ret;
}

static int
isert_put_login_tx(struct iscsi_conn *conn, struct iscsi_login *login,
		   u32 length)
{
	struct isert_conn *isert_conn = conn->context;
	struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
	struct iser_tx_desc *tx_desc = &isert_conn->conn_login_tx_desc;
	int ret;

	isert_create_send_desc(isert_conn, NULL, tx_desc);

	memcpy(&tx_desc->iscsi_header, &login->rsp[0],
	       sizeof(struct iscsi_hdr));

	isert_init_tx_hdrs(isert_conn, tx_desc);

	if (length > 0) {
		struct ib_sge *tx_dsg = &tx_desc->tx_sg[1];

		ib_dma_sync_single_for_cpu(ib_dev, isert_conn->login_rsp_dma,
					   length, DMA_TO_DEVICE);

		memcpy(isert_conn->login_rsp_buf, login->rsp_buf, length);

		ib_dma_sync_single_for_device(ib_dev, isert_conn->login_rsp_dma,
					      length, DMA_TO_DEVICE);

		tx_dsg->addr	= isert_conn->login_rsp_dma;
		tx_dsg->length	= length;
		tx_dsg->lkey	= isert_conn->conn_mr->lkey;
		tx_desc->num_sge = 2;
	}
	if (!login->login_failed) {
		if (login->login_complete) {
1057
1058
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1060
1061
1062
1063
1064
1065
1066
1067
1068
			if (isert_conn->conn_device->use_fastreg) {
				u8 pi_support = login->np->tpg_np->tpg->tpg_attrib.t10_pi;

				ret = isert_conn_create_fastreg_pool(isert_conn,
								     pi_support);
				if (ret) {
					pr_err("Conn: %p failed to create"
					       " fastreg pool\n", isert_conn);
					return ret;
				}
			}

1069
1070
1071
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1080
1081
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1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
			ret = isert_alloc_rx_descriptors(isert_conn);
			if (ret)
				return ret;

			ret = isert_post_recv(isert_conn, ISERT_MIN_POSTED_RX);
			if (ret)
				return ret;

			isert_conn->state = ISER_CONN_UP;
			goto post_send;
		}

		ret = isert_rdma_post_recvl(isert_conn);
		if (ret)
			return ret;
	}
post_send:
	ret = isert_post_send(isert_conn, tx_desc);
	if (ret)
		return ret;

	return 0;
}

static void
isert_rx_login_req(struct iser_rx_desc *rx_desc, int rx_buflen,
		   struct isert_conn *isert_conn)
{
	struct iscsi_conn *conn = isert_conn->conn;
	struct iscsi_login *login = conn->conn_login;
	int size;

	if (!login) {
		pr_err("conn->conn_login is NULL\n");
		dump_stack();
		return;
	}

	if (login->first_request) {
		struct iscsi_login_req *login_req =
			(struct iscsi_login_req *)&rx_desc->iscsi_header;
		/*
		 * Setup the initial iscsi_login values from the leading
		 * login request PDU.
		 */
		login->leading_connection = (!login_req->tsih) ? 1 : 0;
		login->current_stage =
			(login_req->flags & ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK)
			 >> 2;
		login->version_min	= login_req->min_version;
		login->version_max	= login_req->max_version;
		memcpy(login->isid, login_req->isid, 6);
		login->cmd_sn		= be32_to_cpu(login_req->cmdsn);
		login->init_task_tag	= login_req->itt;
		login->initial_exp_statsn = be32_to_cpu(login_req->exp_statsn);
		login->cid		= be16_to_cpu(login_req->cid);
		login->tsih		= be16_to_cpu(login_req->tsih);
	}

	memcpy(&login->req[0], (void *)&rx_desc->iscsi_header, ISCSI_HDR_LEN);

	size = min(rx_buflen, MAX_KEY_VALUE_PAIRS);
	pr_debug("Using login payload size: %d, rx_buflen: %d MAX_KEY_VALUE_PAIRS: %d\n",
		 size, rx_buflen, MAX_KEY_VALUE_PAIRS);
	memcpy(login->req_buf, &rx_desc->data[0], size);

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1137
1138
1139
	if (login->first_request) {
		complete(&isert_conn->conn_login_comp);
		return;
	}
	schedule_delayed_work(&conn->login_work, 0);
1140
1141
1142
}

static struct iscsi_cmd
1143
*isert_allocate_cmd(struct iscsi_conn *conn)
1144
1145
1146
{
	struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
	struct isert_cmd *isert_cmd;
1147
	struct iscsi_cmd *cmd;
1148

1149
	cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
1150
1151
	if (!cmd) {
		pr_err("Unable to allocate iscsi_cmd + isert_cmd\n");
1152
1153
		return NULL;
	}
1154
	isert_cmd = iscsit_priv_cmd(cmd);
1155
	isert_cmd->conn = isert_conn;
1156
	isert_cmd->iscsi_cmd = cmd;
1157

1158
	return cmd;
1159
1160
1161
1162
}

static int
isert_handle_scsi_cmd(struct isert_conn *isert_conn,
1163
1164
		      struct isert_cmd *isert_cmd, struct iscsi_cmd *cmd,
		      struct iser_rx_desc *rx_desc, unsigned char *buf)
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{
	struct iscsi_conn *conn = isert_conn->conn;
	struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
	struct scatterlist *sg;
	int imm_data, imm_data_len, unsol_data, sg_nents, rc;
	bool dump_payload = false;

	rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
	if (rc < 0)
		return rc;

	imm_data = cmd->immediate_data;
	imm_data_len = cmd->first_burst_len;
	unsol_data = cmd->unsolicited_data;

	rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
	if (rc < 0) {
		return 0;
	} else if (rc > 0) {
		dump_payload = true;
		goto sequence_cmd;
	}

	if (!imm_data)
		return 0;

	sg = &cmd->se_cmd.t_data_sg[0];
	sg_nents = max(1UL, DIV_ROUND_UP(imm_data_len, PAGE_SIZE));

	pr_debug("Copying Immediate SG: %p sg_nents: %u from %p imm_data_len: %d\n",
		 sg, sg_nents, &rx_desc->data[0], imm_data_len);

	sg_copy_from_buffer(sg, sg_nents, &rx_desc->data[0], imm_data_len);

	cmd->write_data_done += imm_data_len;

	if (cmd->write_data_done == cmd->se_cmd.data_length) {
		spin_lock_bh(&cmd->istate_lock);
		cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
		cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
		spin_unlock_bh(&cmd->istate_lock);
	}

sequence_cmd:
1209
	rc = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
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1266
1267
1268
1269

	if (!rc && dump_payload == false && unsol_data)
		iscsit_set_unsoliticed_dataout(cmd);

	return 0;
}

static int
isert_handle_iscsi_dataout(struct isert_conn *isert_conn,
			   struct iser_rx_desc *rx_desc, unsigned char *buf)
{
	struct scatterlist *sg_start;
	struct iscsi_conn *conn = isert_conn->conn;
	struct iscsi_cmd *cmd = NULL;
	struct iscsi_data *hdr = (struct iscsi_data *)buf;
	u32 unsol_data_len = ntoh24(hdr->dlength);
	int rc, sg_nents, sg_off, page_off;

	rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
	if (rc < 0)
		return rc;
	else if (!cmd)
		return 0;
	/*
	 * FIXME: Unexpected unsolicited_data out
	 */
	if (!cmd->unsolicited_data) {
		pr_err("Received unexpected solicited data payload\n");
		dump_stack();
		return -1;
	}

	pr_debug("Unsolicited DataOut unsol_data_len: %u, write_data_done: %u, data_length: %u\n",
		 unsol_data_len, cmd->write_data_done, cmd->se_cmd.data_length);

	sg_off = cmd->write_data_done / PAGE_SIZE;
	sg_start = &cmd->se_cmd.t_data_sg[sg_off];
	sg_nents = max(1UL, DIV_ROUND_UP(unsol_data_len, PAGE_SIZE));
	page_off = cmd->write_data_done % PAGE_SIZE;
	/*
	 * FIXME: Non page-aligned unsolicited_data out
	 */
	if (page_off) {
		pr_err("Received unexpected non-page aligned data payload\n");
		dump_stack();
		return -1;
	}
	pr_debug("Copying DataOut: sg_start: %p, sg_off: %u sg_nents: %u from %p %u\n",
		 sg_start, sg_off, sg_nents, &rx_desc->data[0], unsol_data_len);

	sg_copy_from_buffer(sg_start, sg_nents, &rx_desc->data[0],
			    unsol_data_len);

	rc = iscsit_check_dataout_payload(cmd, hdr, false);
	if (rc < 0)
		return rc;

	return 0;
}

1270
1271
static int
isert_handle_nop_out(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1272
1273
		     struct iscsi_cmd *cmd, struct iser_rx_desc *rx_desc,
		     unsigned char *buf)
1274
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1279
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1288
{
	struct iscsi_conn *conn = isert_conn->conn;
	struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
	int rc;

	rc = iscsit_setup_nop_out(conn, cmd, hdr);
	if (rc < 0)
		return rc;
	/*
	 * FIXME: Add support for NOPOUT payload using unsolicited RDMA payload
	 */

	return iscsit_process_nop_out(conn, cmd, hdr);
}

1289
1290
static int
isert_handle_text_cmd(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1291
1292
		      struct iscsi_cmd *cmd, struct iser_rx_desc *rx_desc,
		      struct iscsi_text *hdr)
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{
	struct iscsi_conn *conn = isert_conn->conn;
	u32 payload_length = ntoh24(hdr->dlength);
	int rc;
	unsigned char *text_in;

	rc = iscsit_setup_text_cmd(conn, cmd, hdr);
	if (rc < 0)
		return rc;

	text_in = kzalloc(payload_length, GFP_KERNEL);
	if (!text_in) {
		pr_err("Unable to allocate text_in of payload_length: %u\n",
		       payload_length);
		return -ENOMEM;
	}
	cmd->text_in_ptr = text_in;

	memcpy(cmd->text_in_ptr, &rx_desc->data[0], payload_length);

	return iscsit_process_text_cmd(conn, cmd, hdr);
}

1316
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1322
static int
isert_rx_opcode(struct isert_conn *isert_conn, struct iser_rx_desc *rx_desc,
		uint32_t read_stag, uint64_t read_va,
		uint32_t write_stag, uint64_t write_va)
{
	struct iscsi_hdr *hdr = &rx_desc->iscsi_header;
	struct iscsi_conn *conn = isert_conn->conn;
1323
	struct iscsi_session *sess = conn->sess;
1324
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1327
1328
	struct iscsi_cmd *cmd;
	struct isert_cmd *isert_cmd;
	int ret = -EINVAL;
	u8 opcode = (hdr->opcode & ISCSI_OPCODE_MASK);

1329
1330
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1333
1334
1335
	if (sess->sess_ops->SessionType &&
	   (!(opcode & ISCSI_OP_TEXT) || !(opcode & ISCSI_OP_LOGOUT))) {
		pr_err("Got illegal opcode: 0x%02x in SessionType=Discovery,"
		       " ignoring\n", opcode);
		return 0;
	}

1336
1337
	switch (opcode) {
	case ISCSI_OP_SCSI_CMD:
1338
		cmd = isert_allocate_cmd(conn);
1339
1340
1341
		if (!cmd)
			break;

1342
		isert_cmd = iscsit_priv_cmd(cmd);
1343
1344
1345
1346
1347
		isert_cmd->read_stag = read_stag;
		isert_cmd->read_va = read_va;
		isert_cmd->write_stag = write_stag;
		isert_cmd->write_va = write_va;

1348
		ret = isert_handle_scsi_cmd(isert_conn, isert_cmd, cmd,
1349
1350
1351
					rx_desc, (unsigned char *)hdr);
		break;
	case ISCSI_OP_NOOP_OUT:
1352
		cmd = isert_allocate_cmd(conn);
1353
1354
1355
		if (!cmd)
			break;

1356
1357
		isert_cmd = iscsit_priv_cmd(cmd);
		ret = isert_handle_nop_out(isert_conn, isert_cmd, cmd,
1358
					   rx_desc, (unsigned char *)hdr);
1359
1360
1361
1362
1363
1364
		break;
	case ISCSI_OP_SCSI_DATA_OUT:
		ret = isert_handle_iscsi_dataout(isert_conn, rx_desc,
						(unsigned char *)hdr);
		break;
	case ISCSI_OP_SCSI_TMFUNC:
1365
		cmd = isert_allocate_cmd(conn);
1366
1367
1368
1369
1370
1371
1372
		if (!cmd)
			break;

		ret = iscsit_handle_task_mgt_cmd(conn, cmd,
						(unsigned char *)hdr);
		break;
	case ISCSI_OP_LOGOUT:
1373
		cmd = isert_allocate_cmd(conn);
1374
1375
1376
1377
1378
1379
1380
1381
1382
		if (!cmd)
			break;

		ret = iscsit_handle_logout_cmd(conn, cmd, (unsigned char *)hdr);
		if (ret > 0)
			wait_for_completion_timeout(&conn->conn_logout_comp,
						    SECONDS_FOR_LOGOUT_COMP *
						    HZ);
		break;
1383
	case ISCSI_OP_TEXT:
1384
		cmd = isert_allocate_cmd(conn);
1385
1386
1387
		if (!cmd)
			break;

1388
1389
		isert_cmd = iscsit_priv_cmd(cmd);
		ret = isert_handle_text_cmd(isert_conn, isert_cmd, cmd,
1390
1391
					    rx_desc, (struct iscsi_text *)hdr);
		break;
1392
1393
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1480
1481
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1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
	default:
		pr_err("Got unknown iSCSI OpCode: 0x%02x\n", opcode);
		dump_stack();
		break;
	}

	return ret;
}

static void
isert_rx_do_work(struct iser_rx_desc *rx_desc, struct isert_conn *isert_conn)
{
	struct iser_hdr *iser_hdr = &rx_desc->iser_header;
	uint64_t read_va = 0, write_va = 0;
	uint32_t read_stag = 0, write_stag = 0;
	int rc;

	switch (iser_hdr->flags & 0xF0) {
	case ISCSI_CTRL:
		if (iser_hdr->flags & ISER_RSV) {
			read_stag = be32_to_cpu(iser_hdr->read_stag);
			read_va = be64_to_cpu(iser_hdr->read_va);
			pr_debug("ISER_RSV: read_stag: 0x%08x read_va: 0x%16llx\n",
				 read_stag, (unsigned long long)read_va);
		}
		if (iser_hdr->flags & ISER_WSV) {
			write_stag = be32_to_cpu(iser_hdr->write_stag);
			write_va = be64_to_cpu(iser_hdr->write_va);
			pr_debug("ISER_WSV: write__stag: 0x%08x write_va: 0x%16llx\n",
				 write_stag, (unsigned long long)write_va);
		}

		pr_debug("ISER ISCSI_CTRL PDU\n");
		break;
	case ISER_HELLO:
		pr_err("iSER Hello message\n");
		break;
	default:
		pr_warn("Unknown iSER hdr flags: 0x%02x\n", iser_hdr->flags);
		break;
	}

	rc = isert_rx_opcode(isert_conn, rx_desc,
			     read_stag, read_va, write_stag, write_va);
}

static void
isert_rx_completion(struct iser_rx_desc *desc, struct isert_conn *isert_conn,
		    unsigned long xfer_len)
{
	struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
	struct iscsi_hdr *hdr;
	u64 rx_dma;
	int rx_buflen, outstanding;

	if ((char *)desc == isert_conn->login_req_buf) {
		rx_dma = isert_conn->login_req_dma;
		rx_buflen = ISER_RX_LOGIN_SIZE;
		pr_debug("ISER login_buf: Using rx_dma: 0x%llx, rx_buflen: %d\n",
			 rx_dma, rx_buflen);
	} else {
		rx_dma = desc->dma_addr;
		rx_buflen = ISER_RX_PAYLOAD_SIZE;
		pr_debug("ISER req_buf: Using rx_dma: 0x%llx, rx_buflen: %d\n",
			 rx_dma, rx_buflen);
	}

	ib_dma_sync_single_for_cpu(ib_dev, rx_dma, rx_buflen, DMA_FROM_DEVICE);

	hdr = &desc->iscsi_header;
	pr_debug("iSCSI opcode: 0x%02x, ITT: 0x%08x, flags: 0x%02x dlen: %d\n",
		 hdr->opcode, hdr->itt, hdr->flags,
		 (int)(xfer_len - ISER_HEADERS_LEN));

	if ((char *)desc == isert_conn->login_req_buf)
		isert_rx_login_req(desc, xfer_len - ISER_HEADERS_LEN,
				   isert_conn);
	else
		isert_rx_do_work(desc, isert_conn);

	ib_dma_sync_single_for_device(ib_dev, rx_dma, rx_buflen,
				      DMA_FROM_DEVICE);

	isert_conn->post_recv_buf_count--;
	pr_debug("iSERT: Decremented post_recv_buf_count: %d\n",
		 isert_conn->post_recv_buf_count);

	if ((char *)desc == isert_conn->login_req_buf)
		return;

	outstanding = isert_conn->post_recv_buf_count;
	if (outstanding + ISERT_MIN_POSTED_RX <= ISERT_QP_MAX_RECV_DTOS) {
		int err, count = min(ISERT_QP_MAX_RECV_DTOS - outstanding,
				ISERT_MIN_POSTED_RX);
		err = isert_post_recv(isert_conn, count);
		if (err) {
			pr_err("isert_post_recv() count: %d failed, %d\n",
			       count, err);
		}
	}
}

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1501
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1506
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static int
isert_map_data_buf(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
		   struct scatterlist *sg, u32 nents, u32 length, u32 offset,
		   enum iser_ib_op_code op, struct isert_data_buf *data)
{
	struct ib_device *ib_dev = isert_conn->conn_cm_id->device;

	data->dma_dir = op == ISER_IB_RDMA_WRITE ?
			      DMA_TO_DEVICE : DMA_FROM_DEVICE;

	data->len = length - offset;
	data->offset = offset;
	data->sg_off = data->offset / PAGE_SIZE;

	data->sg = &sg[data->sg_off];
	data->nents = min_t(unsigned int, nents - data->sg_off,
					  ISCSI_ISER_SG_TABLESIZE);
	data->len = min_t(unsigned int, data->len, ISCSI_ISER_SG_TABLESIZE *
					PAGE_SIZE);

	data->dma_nents = ib_dma_map_sg(ib_dev, data->sg, data->nents,
					data->dma_dir);
	if (unlikely(!data->dma_nents)) {
		pr_err("Cmd: unable to dma map SGs %p\n", sg);
		return -EINVAL;
	}

	pr_debug("Mapped cmd: %p count: %u sg: %p sg_nents: %u rdma_len %d\n",
		 isert_cmd, data->dma_nents, data->sg, data->nents, data->len);

	return 0;
}

static void
isert_unmap_data_buf(struct isert_conn *isert_conn, struct isert_data_buf *data)
{
	struct ib_device *ib_dev = isert_conn->conn_cm_id->device;

	ib_dma_unmap_sg(ib_dev, data->sg, data->nents, data->dma_dir);
	memset(data, 0, sizeof(*data));
}



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static void
isert_unmap_cmd(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn)
{
	struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;

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	pr_debug("isert_unmap_cmd: %p\n", isert_cmd);
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	if (wr->data.sg) {
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		pr_debug("isert_unmap_cmd: %p unmap_sg op\n", isert_cmd);
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		isert_unmap_data_buf(isert_conn, &wr->data);
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	}

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	if (wr->send_wr) {
		pr_debug("isert_unmap_cmd: %p free send_wr\n", isert_cmd);
		kfree(wr->send_wr);
		wr->send_wr = NULL;
	}
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	if (wr->ib_sge) {
		pr_debug("isert_unmap_cmd: %p free ib_sge\n", isert_cmd);
		kfree(wr->ib_sge);
		wr->ib_sge = NULL;
	}
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}

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static void
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isert_unreg_rdma(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn)
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{
	struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
	LIST_HEAD(unmap_list);

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	pr_debug("unreg_fastreg_cmd: %p\n", isert_cmd);
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	if (wr->fr_desc) {
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		pr_debug("unreg_fastreg_cmd: %p free fr_desc %p\n",
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			 isert_cmd, wr->fr_desc);
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		if (wr->fr_desc->ind & ISERT_PROTECTED) {
			isert_unmap_data_buf(isert_conn, &wr->prot);
			wr->fr_desc->ind &= ~ISERT_PROTECTED;
		}
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		spin_lock_bh(&isert_conn->conn_lock);
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		list_add_tail(&wr->fr_desc->list, &isert_conn->conn_fr_pool);
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		spin_unlock_bh(&isert_conn->conn_lock);
		wr->fr_desc = NULL;
	}

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	if (wr->data.sg) {
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		pr_debug("unreg_fastreg_cmd: %p unmap_sg op\n", isert_cmd);
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		isert_unmap_data_buf(isert_conn, &wr->data);
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	}

	wr->ib_sge = NULL;
	wr->send_wr = NULL;
}

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static void
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isert_put_cmd(struct isert_cmd *isert_cmd, bool comp_err)
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{
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	struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
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	struct isert_conn *isert_conn = isert_cmd->conn;
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	struct iscsi_conn *conn = isert_conn->conn;
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	struct isert_device *device = isert_conn->conn_device;
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	pr_debug("Entering isert_put_cmd: %p\n", isert_cmd);

	switch (cmd->iscsi_opcode) {
	case ISCSI_OP_SCSI_CMD:
		spin_lock_bh(&conn->cmd_lock);
		if (!list_empty(&cmd->i_conn_node))
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			list_del_init(&cmd->i_conn_node);
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		spin_unlock_bh(&conn->cmd_lock);

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		if (cmd->data_direction == DMA_TO_DEVICE) {
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			iscsit_stop_dataout_timer(cmd);
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			/*
			 * Check for special case during comp_err where
			 * WRITE_PENDING has been handed off from core,
			 * but requires an extra target_put_sess_cmd()
			 * before transport_generic_free_cmd() below.
			 */
			if (comp_err &&
			    cmd->se_cmd.t_state == TRANSPORT_WRITE_PENDING) {
				struct se_cmd *se_cmd = &cmd->se_cmd;

				target_put_sess_cmd(se_cmd->se_sess, se_cmd);
			}
		}
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		device->unreg_rdma_mem(isert_cmd, isert_conn);
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		transport_generic_free_cmd(&cmd->se_cmd, 0);
		break;
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	case ISCSI_OP_SCSI_TMFUNC:
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		spin_lock_bh(&conn->cmd_lock);
		if (!list_empty(&cmd->i_conn_node))
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			list_del_init(&cmd->i_conn_node);
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		spin_unlock_bh(&conn->cmd_lock);

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		transport_generic_free_cmd(&cmd->se_cmd, 0);
		break;
	case ISCSI_OP_REJECT:
	case ISCSI_OP_NOOP_OUT:
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	case ISCSI_OP_TEXT:
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		spin_lock_bh(&conn->cmd_lock);
		if (!list_empty(&cmd->i_conn_node))
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			list_del_init(&cmd->i_conn_node);
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		spin_unlock_bh(&conn->cmd_lock);

		/*
		 * Handle special case for REJECT when iscsi_add_reject*() has
		 * overwritten the original iscsi_opcode assignment, and the
		 * associated cmd->se_cmd needs to be released.
		 */
		if (cmd->se_cmd.se_tfo != NULL) {
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			pr_debug("Calling transport_generic_free_cmd from"
				 " isert_put_cmd for 0x%02x\n",
				 cmd->iscsi_opcode);
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			transport_generic_free_cmd(&cmd->se_cmd, 0);
			break;
		}
		/*
		 * Fall-through
		 */
	default:
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		iscsit_release_cmd(cmd);
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		break;
	}
}

static void
isert_unmap_tx_desc(struct iser_tx_desc *tx_desc, struct ib_device *ib_dev)
{
	if (tx_desc->dma_addr != 0) {
		pr_debug("Calling ib_dma_unmap_single for tx_desc->dma_addr\n");
		ib_dma_unmap_single(ib_dev, tx_desc->dma_addr,
				    ISER_HEADERS_LEN, DMA_TO_DEVICE);
		tx_desc->dma_addr = 0;
	}
}

static void
isert_completion_put(struct iser_tx_desc *tx_desc, struct isert_cmd *isert_cmd,
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		     struct ib_device *ib_dev, bool comp_err)
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{
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	if (isert_cmd->pdu_buf_dma != 0) {
		pr_debug("Calling ib_dma_unmap_single for isert_cmd->pdu_buf_dma\n");
		ib_dma_unmap_single(ib_dev, isert_cmd->pdu_buf_dma,
				    isert_cmd->pdu_buf_len, DMA_TO_DEVICE);
		isert_cmd->pdu_buf_dma = 0;
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