1 files changed, 411 insertions, 143 deletions

diff --git a/drivers/infiniband/ulp/iser/iser_verbs.c b/drivers/infiniband/ulp/iser/iser_verbs.c
index 2c4941d0656..ea01075f9f9 100644
--- a/drivers/infiniband/ulp/iser/iser_verbs.c
+++ b/drivers/infiniband/ulp/iser/iser_verbs.c
@@ -1,7 +1,7 @@
 /*
  * Copyright (c) 2004, 2005, 2006 Voltaire, Inc. All rights reserved.
  * Copyright (c) 2005, 2006 Cisco Systems.  All rights reserved.
- * Copyright (c) 2013 Mellanox Technologies. All rights reserved.
+ * Copyright (c) 2013-2014 Mellanox Technologies. 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
@@ -71,8 +71,35 @@ static void iser_event_handler(struct ib_event_handler *handler,
  */
 static int iser_create_device_ib_res(struct iser_device *device)
 {
-	int i, j;
 	struct iser_cq_desc *cq_desc;
+	struct ib_device_attr *dev_attr = &device->dev_attr;
+	int ret, i, j;
+
+	ret = ib_query_device(device->ib_device, dev_attr);
+	if (ret) {
+		pr_warn("Query device failed for %s\n", device->ib_device->name);
+		return ret;
+	}
+
+	/* Assign function handles  - based on FMR support */
+	if (device->ib_device->alloc_fmr && device->ib_device->dealloc_fmr &&
+	    device->ib_device->map_phys_fmr && device->ib_device->unmap_fmr) {
+		iser_info("FMR supported, using FMR for registration\n");
+		device->iser_alloc_rdma_reg_res = iser_create_fmr_pool;
+		device->iser_free_rdma_reg_res = iser_free_fmr_pool;
+		device->iser_reg_rdma_mem = iser_reg_rdma_mem_fmr;
+		device->iser_unreg_rdma_mem = iser_unreg_mem_fmr;
+	} else
+	if (dev_attr->device_cap_flags & IB_DEVICE_MEM_MGT_EXTENSIONS) {
+		iser_info("FastReg supported, using FastReg for registration\n");
+		device->iser_alloc_rdma_reg_res = iser_create_fastreg_pool;
+		device->iser_free_rdma_reg_res = iser_free_fastreg_pool;
+		device->iser_reg_rdma_mem = iser_reg_rdma_mem_fastreg;
+		device->iser_unreg_rdma_mem = iser_unreg_mem_fastreg;
+	} else {
+		iser_err("IB device does not support FMRs nor FastRegs, can't register memory\n");
+		return -1;
+	}
 
 	device->cqs_used = min(ISER_MAX_CQ, device->ib_device->num_comp_vectors);
 	iser_info("using %d CQs, device %s supports %d vectors\n",
@@ -178,56 +205,23 @@ static void iser_free_device_ib_res(struct iser_device *device)
 }
 
 /**
- * iser_create_ib_conn_res - Creates FMR pool and Queue-Pair (QP)
+ * iser_create_fmr_pool - Creates FMR pool and page_vector
  *
- * returns 0 on success, -1 on failure
+ * returns 0 on success, or errno code on failure
  */
-static int iser_create_ib_conn_res(struct iser_conn *ib_conn)
+int iser_create_fmr_pool(struct iser_conn *ib_conn, unsigned cmds_max)
 {
-	struct iser_device	*device;
-	struct ib_qp_init_attr	init_attr;
-	int			req_err, resp_err, ret = -ENOMEM;
+	struct iser_device *device = ib_conn->device;
 	struct ib_fmr_pool_param params;
-	int index, min_index = 0;
-
-	BUG_ON(ib_conn->device == NULL);
-
-	device = ib_conn->device;
-
-	ib_conn->login_buf = kmalloc(ISCSI_DEF_MAX_RECV_SEG_LEN +
-					ISER_RX_LOGIN_SIZE, GFP_KERNEL);
-	if (!ib_conn->login_buf)
-		goto out_err;
-
-	ib_conn->login_req_buf  = ib_conn->login_buf;
-	ib_conn->login_resp_buf = ib_conn->login_buf + ISCSI_DEF_MAX_RECV_SEG_LEN;
-
-	ib_conn->login_req_dma = ib_dma_map_single(ib_conn->device->ib_device,
-				(void *)ib_conn->login_req_buf,
-				ISCSI_DEF_MAX_RECV_SEG_LEN, DMA_TO_DEVICE);
-
-	ib_conn->login_resp_dma = ib_dma_map_single(ib_conn->device->ib_device,
-				(void *)ib_conn->login_resp_buf,
-				ISER_RX_LOGIN_SIZE, DMA_FROM_DEVICE);
+	int ret = -ENOMEM;
 
-	req_err  = ib_dma_mapping_error(device->ib_device, ib_conn->login_req_dma);
-	resp_err = ib_dma_mapping_error(device->ib_device, ib_conn->login_resp_dma);
+	ib_conn->fmr.page_vec = kmalloc(sizeof(*ib_conn->fmr.page_vec) +
+					(sizeof(u64)*(ISCSI_ISER_SG_TABLESIZE + 1)),
+					GFP_KERNEL);
+	if (!ib_conn->fmr.page_vec)
+		return ret;
 
-	if (req_err || resp_err) {
-		if (req_err)
-			ib_conn->login_req_dma = 0;
-		if (resp_err)
-			ib_conn->login_resp_dma = 0;
-		goto out_err;
-	}
-
-	ib_conn->page_vec = kmalloc(sizeof(struct iser_page_vec) +
-				    (sizeof(u64) * (ISCSI_ISER_SG_TABLESIZE +1)),
-				    GFP_KERNEL);
-	if (!ib_conn->page_vec)
-		goto out_err;
-
-	ib_conn->page_vec->pages = (u64 *) (ib_conn->page_vec + 1);
+	ib_conn->fmr.page_vec->pages = (u64 *)(ib_conn->fmr.page_vec + 1);
 
 	params.page_shift        = SHIFT_4K;
 	/* when the first/last SG element are not start/end *
@@ -235,25 +229,224 @@ static int iser_create_ib_conn_res(struct iser_conn *ib_conn)
 	params.max_pages_per_fmr = ISCSI_ISER_SG_TABLESIZE + 1;
 	/* make the pool size twice the max number of SCSI commands *
 	 * the ML is expected to queue, watermark for unmap at 50%  */
-	params.pool_size	 = ISCSI_DEF_XMIT_CMDS_MAX * 2;
-	params.dirty_watermark	 = ISCSI_DEF_XMIT_CMDS_MAX;
+	params.pool_size	 = cmds_max * 2;
+	params.dirty_watermark	 = cmds_max;
 	params.cache		 = 0;
 	params.flush_function	 = NULL;
 	params.access		 = (IB_ACCESS_LOCAL_WRITE  |
 				    IB_ACCESS_REMOTE_WRITE |
 				    IB_ACCESS_REMOTE_READ);
 
-	ib_conn->fmr_pool = ib_create_fmr_pool(device->pd, &params);
-	ret = PTR_ERR(ib_conn->fmr_pool);
-	if (IS_ERR(ib_conn->fmr_pool) && ret != -ENOSYS) {
-		ib_conn->fmr_pool = NULL;
-		goto out_err;
-	} else if (ret == -ENOSYS) {
-		ib_conn->fmr_pool = NULL;
+	ib_conn->fmr.pool = ib_create_fmr_pool(device->pd, &params);
+	if (!IS_ERR(ib_conn->fmr.pool))
+		return 0;
+
+	/* no FMR => no need for page_vec */
+	kfree(ib_conn->fmr.page_vec);
+	ib_conn->fmr.page_vec = NULL;
+
+	ret = PTR_ERR(ib_conn->fmr.pool);
+	ib_conn->fmr.pool = NULL;
+	if (ret != -ENOSYS) {
+		iser_err("FMR allocation failed, err %d\n", ret);
+		return ret;
+	} else {
 		iser_warn("FMRs are not supported, using unaligned mode\n");
-		ret = 0;
+		return 0;
+	}
+}
+
+/**
+ * iser_free_fmr_pool - releases the FMR pool and page vec
+ */
+void iser_free_fmr_pool(struct iser_conn *ib_conn)
+{
+	iser_info("freeing conn %p fmr pool %p\n",
+		  ib_conn, ib_conn->fmr.pool);
+
+	if (ib_conn->fmr.pool != NULL)
+		ib_destroy_fmr_pool(ib_conn->fmr.pool);
+
+	ib_conn->fmr.pool = NULL;
+
+	kfree(ib_conn->fmr.page_vec);
+	ib_conn->fmr.page_vec = NULL;
+}
+
+static int
+iser_create_fastreg_desc(struct ib_device *ib_device, struct ib_pd *pd,
+			 bool pi_enable, struct fast_reg_descriptor *desc)
+{
+	int ret;
+
+	desc->data_frpl = ib_alloc_fast_reg_page_list(ib_device,
+						      ISCSI_ISER_SG_TABLESIZE + 1);
+	if (IS_ERR(desc->data_frpl)) {
+		ret = PTR_ERR(desc->data_frpl);
+		iser_err("Failed to allocate ib_fast_reg_page_list err=%d\n",
+			 ret);
+		return PTR_ERR(desc->data_frpl);
+	}
+
+	desc->data_mr = ib_alloc_fast_reg_mr(pd, ISCSI_ISER_SG_TABLESIZE + 1);
+	if (IS_ERR(desc->data_mr)) {
+		ret = PTR_ERR(desc->data_mr);
+		iser_err("Failed to allocate ib_fast_reg_mr err=%d\n", ret);
+		goto fast_reg_mr_failure;
+	}
+	desc->reg_indicators |= ISER_DATA_KEY_VALID;
+
+	if (pi_enable) {
+		struct ib_mr_init_attr mr_init_attr = {0};
+		struct iser_pi_context *pi_ctx = NULL;
+
+		desc->pi_ctx = kzalloc(sizeof(*desc->pi_ctx), GFP_KERNEL);
+		if (!desc->pi_ctx) {
+			iser_err("Failed to allocate pi context\n");
+			ret = -ENOMEM;
+			goto pi_ctx_alloc_failure;
+		}
+		pi_ctx = 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)) {
+			ret = PTR_ERR(pi_ctx->prot_frpl);
+			iser_err("Failed to allocate prot frpl ret=%d\n",
+				 ret);
+			goto prot_frpl_failure;
+		}
+
+		pi_ctx->prot_mr = ib_alloc_fast_reg_mr(pd,
+						ISCSI_ISER_SG_TABLESIZE + 1);
+		if (IS_ERR(pi_ctx->prot_mr)) {
+			ret = PTR_ERR(pi_ctx->prot_mr);
+			iser_err("Failed to allocate prot frmr ret=%d\n",
+				 ret);
+			goto prot_mr_failure;
+		}
+		desc->reg_indicators |= ISER_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)) {
+			ret = PTR_ERR(pi_ctx->sig_mr);
+			iser_err("Failed to allocate signature enabled mr err=%d\n",
+				 ret);
+			goto sig_mr_failure;
+		}
+		desc->reg_indicators |= ISER_SIG_KEY_VALID;
+	}
+	desc->reg_indicators &= ~ISER_FASTREG_PROTECTED;
+
+	iser_dbg("Create fr_desc %p page_list %p\n",
+		 desc, desc->data_frpl->page_list);
+
+	return 0;
+sig_mr_failure:
+	ib_dereg_mr(desc->pi_ctx->prot_mr);
+prot_mr_failure:
+	ib_free_fast_reg_page_list(desc->pi_ctx->prot_frpl);
+prot_frpl_failure:
+	kfree(desc->pi_ctx);
+pi_ctx_alloc_failure:
+	ib_dereg_mr(desc->data_mr);
+fast_reg_mr_failure:
+	ib_free_fast_reg_page_list(desc->data_frpl);
+
+	return ret;
+}
+
+/**
+ * iser_create_fastreg_pool - Creates pool of fast_reg descriptors
+ * for fast registration work requests.
+ * returns 0 on success, or errno code on failure
+ */
+int iser_create_fastreg_pool(struct iser_conn *ib_conn, unsigned cmds_max)
+{
+	struct iser_device	*device = ib_conn->device;
+	struct fast_reg_descriptor	*desc;
+	int i, ret;
+
+	INIT_LIST_HEAD(&ib_conn->fastreg.pool);
+	ib_conn->fastreg.pool_size = 0;
+	for (i = 0; i < cmds_max; i++) {
+		desc = kzalloc(sizeof(*desc), GFP_KERNEL);
+		if (!desc) {
+			iser_err("Failed to allocate a new fast_reg descriptor\n");
+			ret = -ENOMEM;
+			goto err;
+		}
+
+		ret = iser_create_fastreg_desc(device->ib_device, device->pd,
+					       ib_conn->pi_support, desc);
+		if (ret) {
+			iser_err("Failed to create fastreg descriptor err=%d\n",
+				 ret);
+			kfree(desc);
+			goto err;
+		}
+
+		list_add_tail(&desc->list, &ib_conn->fastreg.pool);
+		ib_conn->fastreg.pool_size++;
+	}
+
+	return 0;
+
+err:
+	iser_free_fastreg_pool(ib_conn);
+	return ret;
+}
+
+/**
+ * iser_free_fastreg_pool - releases the pool of fast_reg descriptors
+ */
+void iser_free_fastreg_pool(struct iser_conn *ib_conn)
+{
+	struct fast_reg_descriptor *desc, *tmp;
+	int i = 0;
+
+	if (list_empty(&ib_conn->fastreg.pool))
+		return;
+
+	iser_info("freeing conn %p fr pool\n", ib_conn);
+
+	list_for_each_entry_safe(desc, tmp, &ib_conn->fastreg.pool, list) {
+		list_del(&desc->list);
+		ib_free_fast_reg_page_list(desc->data_frpl);
+		ib_dereg_mr(desc->data_mr);
+		if (desc->pi_ctx) {
+			ib_free_fast_reg_page_list(desc->pi_ctx->prot_frpl);
+			ib_dereg_mr(desc->pi_ctx->prot_mr);
+			ib_destroy_mr(desc->pi_ctx->sig_mr);
+			kfree(desc->pi_ctx);
+		}
+		kfree(desc);
+		++i;
 	}
 
+	if (i < ib_conn->fastreg.pool_size)
+		iser_warn("pool still has %d regions registered\n",
+			  ib_conn->fastreg.pool_size - i);
+}
+
+/**
+ * iser_create_ib_conn_res - Queue-Pair (QP)
+ *
+ * returns 0 on success, -1 on failure
+ */
+static int iser_create_ib_conn_res(struct iser_conn *ib_conn)
+{
+	struct iser_device	*device;
+	struct ib_qp_init_attr	init_attr;
+	int			ret = -ENOMEM;
+	int index, min_index = 0;
+
+	BUG_ON(ib_conn->device == NULL);
+
+	device = ib_conn->device;
+
 	memset(&init_attr, 0, sizeof init_attr);
 
 	mutex_lock(&ig.connlist_mutex);
@@ -270,21 +463,26 @@ static int iser_create_ib_conn_res(struct iser_conn *ib_conn)
 	init_attr.qp_context	= (void *)ib_conn;
 	init_attr.send_cq	= device->tx_cq[min_index];
 	init_attr.recv_cq	= device->rx_cq[min_index];
-	init_attr.cap.max_send_wr  = ISER_QP_MAX_REQ_DTOS;
 	init_attr.cap.max_recv_wr  = ISER_QP_MAX_RECV_DTOS;
 	init_attr.cap.max_send_sge = 2;
 	init_attr.cap.max_recv_sge = 1;
 	init_attr.sq_sig_type	= IB_SIGNAL_REQ_WR;
 	init_attr.qp_type	= IB_QPT_RC;
+	if (ib_conn->pi_support) {
+		init_attr.cap.max_send_wr = ISER_QP_SIG_MAX_REQ_DTOS;
+		init_attr.create_flags |= IB_QP_CREATE_SIGNATURE_EN;
+	} else {
+		init_attr.cap.max_send_wr  = ISER_QP_MAX_REQ_DTOS;
+	}
 
 	ret = rdma_create_qp(ib_conn->cma_id, device->pd, &init_attr);
 	if (ret)
 		goto out_err;
 
 	ib_conn->qp = ib_conn->cma_id->qp;
-	iser_info("setting conn %p cma_id %p: fmr_pool %p qp %p\n",
+	iser_info("setting conn %p cma_id %p qp %p\n",
 		  ib_conn, ib_conn->cma_id,
-		  ib_conn->fmr_pool, ib_conn->cma_id->qp);
+		  ib_conn->cma_id->qp);
 	return ret;
 
 out_err:
@@ -293,7 +491,7 @@ out_err:
 }
 
 /**
- * releases the FMR pool and QP objects, returns 0 on success,
+ * releases the QP objects, returns 0 on success,
  * -1 on failure
  */
 static int iser_free_ib_conn_res(struct iser_conn *ib_conn)
@@ -301,13 +499,11 @@ static int iser_free_ib_conn_res(struct iser_conn *ib_conn)
 	int cq_index;
 	BUG_ON(ib_conn == NULL);
 
-	iser_info("freeing conn %p cma_id %p fmr pool %p qp %p\n",
+	iser_info("freeing conn %p cma_id %p qp %p\n",
 		  ib_conn, ib_conn->cma_id,
-		  ib_conn->fmr_pool, ib_conn->qp);
+		  ib_conn->qp);
 
 	/* qp is created only once both addr & route are resolved */
-	if (ib_conn->fmr_pool != NULL)
-		ib_destroy_fmr_pool(ib_conn->fmr_pool);
 
 	if (ib_conn->qp != NULL) {
 		cq_index = ((struct iser_cq_desc *)ib_conn->qp->recv_cq->cq_context)->cq_index;
@@ -316,21 +512,7 @@ static int iser_free_ib_conn_res(struct iser_conn *ib_conn)
 		rdma_destroy_qp(ib_conn->cma_id);
 	}
 
-	ib_conn->fmr_pool = NULL;
 	ib_conn->qp	  = NULL;
-	kfree(ib_conn->page_vec);
-
-	if (ib_conn->login_buf) {
-		if (ib_conn->login_req_dma)
-			ib_dma_unmap_single(ib_conn->device->ib_device,
-				ib_conn->login_req_dma,
-				ISCSI_DEF_MAX_RECV_SEG_LEN, DMA_TO_DEVICE);
-		if (ib_conn->login_resp_dma)
-			ib_dma_unmap_single(ib_conn->device->ib_device,
-				ib_conn->login_resp_dma,
-				ISER_RX_LOGIN_SIZE, DMA_FROM_DEVICE);
-		kfree(ib_conn->login_buf);
-	}
 
 	return 0;
 }
@@ -399,14 +581,30 @@ static int iser_conn_state_comp_exch(struct iser_conn *ib_conn,
 	return ret;
 }
 
+void iser_release_work(struct work_struct *work)
+{
+	struct iser_conn *ib_conn;
+
+	ib_conn = container_of(work, struct iser_conn, release_work);
+
+	/* wait for .conn_stop callback */
+	wait_for_completion(&ib_conn->stop_completion);
+
+	/* wait for the qp`s post send and post receive buffers to empty */
+	wait_event_interruptible(ib_conn->wait,
+				 ib_conn->state == ISER_CONN_DOWN);
+
+	iser_conn_release(ib_conn);
+}
+
 /**
  * Frees all conn objects and deallocs conn descriptor
  */
-static void iser_conn_release(struct iser_conn *ib_conn, int can_destroy_id)
+void iser_conn_release(struct iser_conn *ib_conn)
 {
 	struct iser_device  *device = ib_conn->device;
 
-	BUG_ON(ib_conn->state != ISER_CONN_DOWN);
+	BUG_ON(ib_conn->state == ISER_CONN_UP);
 
 	mutex_lock(&ig.connlist_mutex);
 	list_del(&ib_conn->conn_list);
@@ -418,27 +616,13 @@ static void iser_conn_release(struct iser_conn *ib_conn, int can_destroy_id)
 	if (device != NULL)
 		iser_device_try_release(device);
 	/* if cma handler context, the caller actually destroy the id */
-	if (ib_conn->cma_id != NULL && can_destroy_id) {
+	if (ib_conn->cma_id != NULL) {
 		rdma_destroy_id(ib_conn->cma_id);
 		ib_conn->cma_id = NULL;
 	}
 	iscsi_destroy_endpoint(ib_conn->ep);
 }
 
-void iser_conn_get(struct iser_conn *ib_conn)
-{
-	atomic_inc(&ib_conn->refcount);
-}
-
-int iser_conn_put(struct iser_conn *ib_conn, int can_destroy_id)
-{
-	if (atomic_dec_and_test(&ib_conn->refcount)) {
-		iser_conn_release(ib_conn, can_destroy_id);
-		return 1;
-	}
-	return 0;
-}
-
 /**
  * triggers start of the disconnect procedures and wait for them to be done
  */
@@ -456,24 +640,19 @@ void iser_conn_terminate(struct iser_conn *ib_conn)
 	if (err)
 		iser_err("Failed to disconnect, conn: 0x%p err %d\n",
 			 ib_conn,err);
-
-	wait_event_interruptible(ib_conn->wait,
-				 ib_conn->state == ISER_CONN_DOWN);
-
-	iser_conn_put(ib_conn, 1); /* deref ib conn deallocate */
 }
 
-static int iser_connect_error(struct rdma_cm_id *cma_id)
+static void iser_connect_error(struct rdma_cm_id *cma_id)
 {
 	struct iser_conn *ib_conn;
+
 	ib_conn = (struct iser_conn *)cma_id->context;
 
 	ib_conn->state = ISER_CONN_DOWN;
 	wake_up_interruptible(&ib_conn->wait);
-	return iser_conn_put(ib_conn, 0); /* deref ib conn's cma id */
 }
 
-static int iser_addr_handler(struct rdma_cm_id *cma_id)
+static void iser_addr_handler(struct rdma_cm_id *cma_id)
 {
 	struct iser_device *device;
 	struct iser_conn   *ib_conn;
@@ -482,22 +661,35 @@ static int iser_addr_handler(struct rdma_cm_id *cma_id)
 	device = iser_device_find_by_ib_device(cma_id);
 	if (!device) {
 		iser_err("device lookup/creation failed\n");
-		return iser_connect_error(cma_id);
+		iser_connect_error(cma_id);
+		return;
 	}
 
 	ib_conn = (struct iser_conn *)cma_id->context;
 	ib_conn->device = device;
 
+	/* connection T10-PI support */
+	if (iser_pi_enable) {
+		if (!(device->dev_attr.device_cap_flags &
+		      IB_DEVICE_SIGNATURE_HANDOVER)) {
+			iser_warn("T10-PI requested but not supported on %s, "
+				  "continue without T10-PI\n",
+				  ib_conn->device->ib_device->name);
+			ib_conn->pi_support = false;
+		} else {
+			ib_conn->pi_support = true;
+		}
+	}
+
 	ret = rdma_resolve_route(cma_id, 1000);
 	if (ret) {
 		iser_err("resolve route failed: %d\n", ret);
-		return iser_connect_error(cma_id);
+		iser_connect_error(cma_id);
+		return;
 	}
-
-	return 0;
 }
 
-static int iser_route_handler(struct rdma_cm_id *cma_id)
+static void iser_route_handler(struct rdma_cm_id *cma_id)
 {
 	struct rdma_conn_param conn_param;
 	int    ret;
@@ -525,33 +717,40 @@ static int iser_route_handler(struct rdma_cm_id *cma_id)
 		goto failure;
 	}
 
-	return 0;
+	return;
 failure:
-	return iser_connect_error(cma_id);
+	iser_connect_error(cma_id);
 }
 
 static void iser_connected_handler(struct rdma_cm_id *cma_id)
 {
 	struct iser_conn *ib_conn;
+	struct ib_qp_attr attr;
+	struct ib_qp_init_attr init_attr;
+
+	(void)ib_query_qp(cma_id->qp, &attr, ~0, &init_attr);
+	iser_info("remote qpn:%x my qpn:%x\n", attr.dest_qp_num, cma_id->qp->qp_num);
 
 	ib_conn = (struct iser_conn *)cma_id->context;
-	ib_conn->state = ISER_CONN_UP;
-	wake_up_interruptible(&ib_conn->wait);
+	if (iser_conn_state_comp_exch(ib_conn, ISER_CONN_PENDING, ISER_CONN_UP))
+		wake_up_interruptible(&ib_conn->wait);
 }
 
-static int iser_disconnected_handler(struct rdma_cm_id *cma_id)
+static void iser_disconnected_handler(struct rdma_cm_id *cma_id)
 {
 	struct iser_conn *ib_conn;
-	int ret;
 
 	ib_conn = (struct iser_conn *)cma_id->context;
 
 	/* getting here when the state is UP means that the conn is being *
 	 * terminated asynchronously from the iSCSI layer's perspective.  */
 	if (iser_conn_state_comp_exch(ib_conn, ISER_CONN_UP,
-				      ISER_CONN_TERMINATING))
-		iscsi_conn_failure(ib_conn->iser_conn->iscsi_conn,
-				   ISCSI_ERR_CONN_FAILED);
+					ISER_CONN_TERMINATING)){
+		if (ib_conn->iscsi_conn)
+			iscsi_conn_failure(ib_conn->iscsi_conn, ISCSI_ERR_CONN_FAILED);
+		else
+			iser_err("iscsi_iser connection isn't bound\n");
+	}
 
 	/* Complete the termination process if no posts are pending */
 	if (ib_conn->post_recv_buf_count == 0 &&
@@ -559,24 +758,19 @@ static int iser_disconnected_handler(struct rdma_cm_id *cma_id)
 		ib_conn->state = ISER_CONN_DOWN;
 		wake_up_interruptible(&ib_conn->wait);
 	}
-
-	ret = iser_conn_put(ib_conn, 0); /* deref ib conn's cma id */
-	return ret;
 }
 
 static int iser_cma_handler(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
 {
-	int ret = 0;
-
 	iser_info("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_ADDR_RESOLVED:
-		ret = iser_addr_handler(cma_id);
+		iser_addr_handler(cma_id);
 		break;
 	case RDMA_CM_EVENT_ROUTE_RESOLVED:
-		ret = iser_route_handler(cma_id);
+		iser_route_handler(cma_id);
 		break;
 	case RDMA_CM_EVENT_ESTABLISHED:
 		iser_connected_handler(cma_id);
@@ -586,18 +780,18 @@ static int iser_cma_handler(struct rdma_cm_id *cma_id, struct rdma_cm_event *eve
 	case RDMA_CM_EVENT_CONNECT_ERROR:
 	case RDMA_CM_EVENT_UNREACHABLE:
 	case RDMA_CM_EVENT_REJECTED:
-		ret = iser_connect_error(cma_id);
+		iser_connect_error(cma_id);
 		break;
 	case RDMA_CM_EVENT_DISCONNECTED:
 	case RDMA_CM_EVENT_DEVICE_REMOVAL:
 	case RDMA_CM_EVENT_ADDR_CHANGE:
-		ret = iser_disconnected_handler(cma_id);
+		iser_disconnected_handler(cma_id);
 		break;
 	default:
 		iser_err("Unexpected RDMA CM event (%d)\n", event->event);
 		break;
 	}
-	return ret;
+	return 0;
 }
 
 void iser_conn_init(struct iser_conn *ib_conn)
@@ -606,7 +800,7 @@ void iser_conn_init(struct iser_conn *ib_conn)
 	init_waitqueue_head(&ib_conn->wait);
 	ib_conn->post_recv_buf_count = 0;
 	atomic_set(&ib_conn->post_send_buf_count, 0);
-	atomic_set(&ib_conn->refcount, 1); /* ref ib conn allocation */
+	init_completion(&ib_conn->stop_completion);
 	INIT_LIST_HEAD(&ib_conn->conn_list);
 	spin_lock_init(&ib_conn->lock);
 }
@@ -634,7 +828,6 @@ int iser_connect(struct iser_conn   *ib_conn,
 
 	ib_conn->state = ISER_CONN_PENDING;
 
-	iser_conn_get(ib_conn); /* ref ib conn's cma id */
 	ib_conn->cma_id = rdma_create_id(iser_cma_handler,
 					     (void *)ib_conn,
 					     RDMA_PS_TCP, IB_QPT_RC);
@@ -671,9 +864,8 @@ id_failure:
 	ib_conn->cma_id = NULL;
 addr_failure:
 	ib_conn->state = ISER_CONN_DOWN;
-	iser_conn_put(ib_conn, 1); /* deref ib conn's cma id */
 connect_failure:
-	iser_conn_put(ib_conn, 1); /* deref ib conn deallocate */
+	iser_conn_release(ib_conn);
 	return err;
 }
 
@@ -694,7 +886,7 @@ int iser_reg_page_vec(struct iser_conn     *ib_conn,
 	page_list = page_vec->pages;
 	io_addr	  = page_list[0];
 
-	mem  = ib_fmr_pool_map_phys(ib_conn->fmr_pool,
+	mem  = ib_fmr_pool_map_phys(ib_conn->fmr.pool,
 				    page_list,
 				    page_vec->length,
 				    io_addr);
@@ -709,7 +901,7 @@ int iser_reg_page_vec(struct iser_conn     *ib_conn,
 	mem_reg->rkey  = mem->fmr->rkey;
 	mem_reg->len   = page_vec->length * SIZE_4K;
 	mem_reg->va    = io_addr;
-	mem_reg->is_fmr = 1;
+	mem_reg->is_mr = 1;
 	mem_reg->mem_h = (void *)mem;
 
 	mem_reg->va   += page_vec->offset;
@@ -727,12 +919,18 @@ int iser_reg_page_vec(struct iser_conn     *ib_conn,
 }
 
 /**
- * Unregister (previosuly registered) memory.
+ * Unregister (previosuly registered using FMR) memory.
+ * If memory is non-FMR does nothing.
  */
-void iser_unreg_mem(struct iser_mem_reg *reg)
+void iser_unreg_mem_fmr(struct iscsi_iser_task *iser_task,
+			enum iser_data_dir cmd_dir)
 {
+	struct iser_mem_reg *reg = &iser_task->rdma_regd[cmd_dir].reg;
 	int ret;
 
+	if (!reg->is_mr)
+		return;
+
 	iser_dbg("PHYSICAL Mem.Unregister mem_h %p\n",reg->mem_h);
 
 	ret = ib_fmr_pool_unmap((struct ib_pool_fmr *)reg->mem_h);
@@ -742,6 +940,23 @@ void iser_unreg_mem(struct iser_mem_reg *reg)
 	reg->mem_h = NULL;
 }
 
+void iser_unreg_mem_fastreg(struct iscsi_iser_task *iser_task,
+			    enum iser_data_dir cmd_dir)
+{
+	struct iser_mem_reg *reg = &iser_task->rdma_regd[cmd_dir].reg;
+	struct iser_conn *ib_conn = iser_task->ib_conn;
+	struct fast_reg_descriptor *desc = reg->mem_h;
+
+	if (!reg->is_mr)
+		return;
+
+	reg->mem_h = NULL;
+	reg->is_mr = 0;
+	spin_lock_bh(&ib_conn->lock);
+	list_add_tail(&desc->list, &ib_conn->fastreg.pool);
+	spin_unlock_bh(&ib_conn->lock);
+}
+
 int iser_post_recvl(struct iser_conn *ib_conn)
 {
 	struct ib_recv_wr rx_wr, *rx_wr_failed;
@@ -779,7 +994,7 @@ int iser_post_recvm(struct iser_conn *ib_conn, int count)
 		rx_wr->sg_list	= &rx_desc->rx_sg;
 		rx_wr->num_sge	= 1;
 		rx_wr->next	= rx_wr + 1;
-		my_rx_head = (my_rx_head + 1) & (ISER_QP_MAX_RECV_DTOS - 1);
+		my_rx_head = (my_rx_head + 1) & ib_conn->qp_max_recv_dtos_mask;
 	}
 
 	rx_wr--;
@@ -839,7 +1054,7 @@ static void iser_handle_comp_error(struct iser_tx_desc *desc,
 		 * perspective.                                             */
 		if (iser_conn_state_comp_exch(ib_conn, ISER_CONN_UP,
 		    ISER_CONN_TERMINATING))
-			iscsi_conn_failure(ib_conn->iser_conn->iscsi_conn,
+			iscsi_conn_failure(ib_conn->iscsi_conn,
 					   ISCSI_ERR_CONN_FAILED);
 
 		/* no more non completed posts to the QP, complete the
@@ -868,9 +1083,11 @@ static int iser_drain_tx_cq(struct iser_device  *device, int cq_index)
 					IB_WC_SEND, wc.opcode);
 		} else {
 			iser_err("tx id %llx status %d vend_err %x\n",
-				wc.wr_id, wc.status, wc.vendor_err);
-			atomic_dec(&ib_conn->post_send_buf_count);
-			iser_handle_comp_error(tx_desc, ib_conn);
+				 wc.wr_id, wc.status, wc.vendor_err);
+			if (wc.wr_id != ISER_FASTREG_LI_WRID) {
+				atomic_dec(&ib_conn->post_send_buf_count);
+				iser_handle_comp_error(tx_desc, ib_conn);
+			}
 		}
 		completed_tx++;
 	}
@@ -888,8 +1105,12 @@ static void iser_cq_tasklet_fn(unsigned long data)
 	 struct iser_rx_desc *desc;
 	 unsigned long	     xfer_len;
 	struct iser_conn *ib_conn;
-	int completed_tx, completed_rx;
-	completed_tx = completed_rx = 0;
+	int completed_tx, completed_rx = 0;
+
+	/* First do tx drain, so in a case where we have rx flushes and a successful
+	 * tx completion we will still go through completion error handling.
+	 */
+	completed_tx = iser_drain_tx_cq(device, cq_index);
 
 	while (ib_poll_cq(cq, 1, &wc) == 1) {
 		desc	 = (struct iser_rx_desc *) (unsigned long) wc.wr_id;
@@ -917,7 +1138,6 @@ static void iser_cq_tasklet_fn(unsigned long data)
 	 * " would not cause interrupts to be missed"                       */
 	ib_req_notify_cq(cq, IB_CQ_NEXT_COMP);
 
-	completed_tx += iser_drain_tx_cq(device, cq_index);
 	iser_dbg("got %d rx %d tx completions\n", completed_rx, completed_tx);
 }
 
@@ -929,3 +1149,51 @@ static void iser_cq_callback(struct ib_cq *cq, void *cq_context)
 
 	tasklet_schedule(&device->cq_tasklet[cq_index]);
 }
+
+u8 iser_check_task_pi_status(struct iscsi_iser_task *iser_task,
+			     enum iser_data_dir cmd_dir, sector_t *sector)
+{
+	struct iser_mem_reg *reg = &iser_task->rdma_regd[cmd_dir].reg;
+	struct fast_reg_descriptor *desc = reg->mem_h;
+	unsigned long sector_size = iser_task->sc->device->sector_size;
+	struct ib_mr_status mr_status;
+	int ret;
+
+	if (desc && desc->reg_indicators & ISER_FASTREG_PROTECTED) {
+		desc->reg_indicators &= ~ISER_FASTREG_PROTECTED;
+		ret = ib_check_mr_status(desc->pi_ctx->sig_mr,
+					 IB_MR_CHECK_SIG_STATUS, &mr_status);
+		if (ret) {
+			pr_err("ib_check_mr_status failed, ret %d\n", ret);
+			goto err;
+		}
+
+		if (mr_status.fail_status & IB_MR_CHECK_SIG_STATUS) {
+			sector_t sector_off = mr_status.sig_err.sig_err_offset;
+
+			do_div(sector_off, sector_size + 8);
+			*sector = scsi_get_lba(iser_task->sc) + sector_off;
+
+			pr_err("PI error found type %d at sector %llx "
+			       "expected %x vs actual %x\n",
+			       mr_status.sig_err.err_type,
+			       (unsigned long long)*sector,
+			       mr_status.sig_err.expected,
+			       mr_status.sig_err.actual);
+
+			switch (mr_status.sig_err.err_type) {
+			case IB_SIG_BAD_GUARD:
+				return 0x1;
+			case IB_SIG_BAD_REFTAG:
+				return 0x3;
+			case IB_SIG_BAD_APPTAG:
+				return 0x2;
+			}
+		}
+	}
+
+	return 0;
+err:
+	/* Not alot we can do here, return ambiguous guard error */
+	return 0x1;
+}