Merge tag 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dledford/rdma

Pull rdma updates from Doug Ledford:
 "Initial roundup of 4.5 merge window patches

   - Remove usage of ib_query_device and instead store attributes in
     ib_device struct

   - Move iopoll out of block and into lib, rename to irqpoll, and use
     in several places in the rdma stack as our new completion queue
     polling library mechanism.  Update the other block drivers that
     already used iopoll to use the new mechanism too.

   - Replace the per-entry GID table locks with a single GID table lock

   - IPoIB multicast cleanup

   - Cleanups to the IB MR facility

   - Add support for 64bit extended IB counters

   - Fix for netlink oops while parsing RDMA nl messages

   - RoCEv2 support for the core IB code

   - mlx4 RoCEv2 support

   - mlx5 RoCEv2 support

   - Cross Channel support for mlx5

   - Timestamp support for mlx5

   - Atomic support for mlx5

   - Raw QP support for mlx5

   - MAINTAINERS update for mlx4/mlx5

   - Misc ocrdma, qib, nes, usNIC, cxgb3, cxgb4, mlx4, mlx5 updates

   - Add support for remote invalidate to the iSER driver (pushed
     through the RDMA tree due to dependencies, acknowledged by nab)

   - Update to NFSoRDMA (pushed through the RDMA tree due to
     dependencies, acknowledged by Bruce)"

* tag 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dledford/rdma: (169 commits)
  IB/mlx5: Unify CQ create flags check
  IB/mlx5: Expose Raw Packet QP to user space consumers
  {IB, net}/mlx5: Move the modify QP operation table to mlx5_ib
  IB/mlx5: Support setting Ethernet priority for Raw Packet QPs
  IB/mlx5: Add Raw Packet QP query functionality
  IB/mlx5: Add create and destroy functionality for Raw Packet QP
  IB/mlx5: Refactor mlx5_ib_qp to accommodate other QP types
  IB/mlx5: Allocate a Transport Domain for each ucontext
  net/mlx5_core: Warn on unsupported events of QP/RQ/SQ
  net/mlx5_core: Add RQ and SQ event handling
  net/mlx5_core: Export transport objects
  IB/mlx5: Expose CQE version to user-space
  IB/mlx5: Add CQE version 1 support to user QPs and SRQs
  IB/mlx5: Fix data validation in mlx5_ib_alloc_ucontext
  IB/sa: Fix netlink local service GFP crash
  IB/srpt: Remove redundant wc array
  IB/qib: Improve ipoib UD performance
  IB/mlx4: Advertise RoCE v2 support
  IB/mlx4: Create and use another QP1 for RoCEv2
  IB/mlx4: Enable send of RoCE QP1 packets with IP/UDP headers
  ...

1 files changed, 131 insertions, 312 deletions

diff --git a/drivers/infiniband/ulp/srpt/ib_srpt.c b/drivers/infiniband/ulp/srpt/ib_srpt.c
index bc5470c43d26..0c37fee363b1 100644
--- a/drivers/infiniband/ulp/srpt/ib_srpt.c
+++ b/drivers/infiniband/ulp/srpt/ib_srpt.c
@@ -93,6 +93,8 @@ MODULE_PARM_DESC(srpt_service_guid,
 static struct ib_client srpt_client;
 static void srpt_release_channel(struct srpt_rdma_ch *ch);
 static int srpt_queue_status(struct se_cmd *cmd);
+static void srpt_recv_done(struct ib_cq *cq, struct ib_wc *wc);
+static void srpt_send_done(struct ib_cq *cq, struct ib_wc *wc);
 
 /**
  * opposite_dma_dir() - Swap DMA_TO_DEVICE and DMA_FROM_DEVICE.
@@ -341,10 +343,10 @@ static void srpt_get_ioc(struct srpt_port *sport, u32 slot,
 	memset(iocp, 0, sizeof *iocp);
 	strcpy(iocp->id_string, SRPT_ID_STRING);
 	iocp->guid = cpu_to_be64(srpt_service_guid);
-	iocp->vendor_id = cpu_to_be32(sdev->dev_attr.vendor_id);
-	iocp->device_id = cpu_to_be32(sdev->dev_attr.vendor_part_id);
-	iocp->device_version = cpu_to_be16(sdev->dev_attr.hw_ver);
-	iocp->subsys_vendor_id = cpu_to_be32(sdev->dev_attr.vendor_id);
+	iocp->vendor_id = cpu_to_be32(sdev->device->attrs.vendor_id);
+	iocp->device_id = cpu_to_be32(sdev->device->attrs.vendor_part_id);
+	iocp->device_version = cpu_to_be16(sdev->device->attrs.hw_ver);
+	iocp->subsys_vendor_id = cpu_to_be32(sdev->device->attrs.vendor_id);
 	iocp->subsys_device_id = 0x0;
 	iocp->io_class = cpu_to_be16(SRP_REV16A_IB_IO_CLASS);
 	iocp->io_subclass = cpu_to_be16(SRP_IO_SUBCLASS);
@@ -453,6 +455,7 @@ static void srpt_mad_send_handler(struct ib_mad_agent *mad_agent,
  * srpt_mad_recv_handler() - MAD reception callback function.
  */
 static void srpt_mad_recv_handler(struct ib_mad_agent *mad_agent,
+				  struct ib_mad_send_buf *send_buf,
 				  struct ib_mad_recv_wc *mad_wc)
 {
 	struct srpt_port *sport = (struct srpt_port *)mad_agent->context;
@@ -778,12 +781,12 @@ static int srpt_post_recv(struct srpt_device *sdev,
 	struct ib_recv_wr wr, *bad_wr;
 
 	BUG_ON(!sdev);
-	wr.wr_id = encode_wr_id(SRPT_RECV, ioctx->ioctx.index);
-
 	list.addr = ioctx->ioctx.dma;
 	list.length = srp_max_req_size;
 	list.lkey = sdev->pd->local_dma_lkey;
 
+	ioctx->ioctx.cqe.done = srpt_recv_done;
+	wr.wr_cqe = &ioctx->ioctx.cqe;
 	wr.next = NULL;
 	wr.sg_list = &list;
 	wr.num_sge = 1;
@@ -819,8 +822,9 @@ static int srpt_post_send(struct srpt_rdma_ch *ch,
 	list.length = len;
 	list.lkey = sdev->pd->local_dma_lkey;
 
+	ioctx->ioctx.cqe.done = srpt_send_done;
 	wr.next = NULL;
-	wr.wr_id = encode_wr_id(SRPT_SEND, ioctx->ioctx.index);
+	wr.wr_cqe = &ioctx->ioctx.cqe;
 	wr.sg_list = &list;
 	wr.num_sge = 1;
 	wr.opcode = IB_WR_SEND;
@@ -1052,13 +1056,13 @@ static void srpt_unmap_sg_to_ib_sge(struct srpt_rdma_ch *ch,
 
 	BUG_ON(!ch);
 	BUG_ON(!ioctx);
-	BUG_ON(ioctx->n_rdma && !ioctx->rdma_ius);
+	BUG_ON(ioctx->n_rdma && !ioctx->rdma_wrs);
 
 	while (ioctx->n_rdma)
-		kfree(ioctx->rdma_ius[--ioctx->n_rdma].sge);
+		kfree(ioctx->rdma_wrs[--ioctx->n_rdma].wr.sg_list);
 
-	kfree(ioctx->rdma_ius);
-	ioctx->rdma_ius = NULL;
+	kfree(ioctx->rdma_wrs);
+	ioctx->rdma_wrs = NULL;
 
 	if (ioctx->mapped_sg_count) {
 		sg = ioctx->sg;
@@ -1082,7 +1086,7 @@ static int srpt_map_sg_to_ib_sge(struct srpt_rdma_ch *ch,
 	struct scatterlist *sg, *sg_orig;
 	int sg_cnt;
 	enum dma_data_direction dir;
-	struct rdma_iu *riu;
+	struct ib_rdma_wr *riu;
 	struct srp_direct_buf *db;
 	dma_addr_t dma_addr;
 	struct ib_sge *sge;
@@ -1109,23 +1113,24 @@ static int srpt_map_sg_to_ib_sge(struct srpt_rdma_ch *ch,
 
 	ioctx->mapped_sg_count = count;
 
-	if (ioctx->rdma_ius && ioctx->n_rdma_ius)
-		nrdma = ioctx->n_rdma_ius;
+	if (ioctx->rdma_wrs && ioctx->n_rdma_wrs)
+		nrdma = ioctx->n_rdma_wrs;
 	else {
 		nrdma = (count + SRPT_DEF_SG_PER_WQE - 1) / SRPT_DEF_SG_PER_WQE
 			+ ioctx->n_rbuf;
 
-		ioctx->rdma_ius = kzalloc(nrdma * sizeof *riu, GFP_KERNEL);
-		if (!ioctx->rdma_ius)
+		ioctx->rdma_wrs = kcalloc(nrdma, sizeof(*ioctx->rdma_wrs),
+				GFP_KERNEL);
+		if (!ioctx->rdma_wrs)
 			goto free_mem;
 
-		ioctx->n_rdma_ius = nrdma;
+		ioctx->n_rdma_wrs = nrdma;
 	}
 
 	db = ioctx->rbufs;
 	tsize = cmd->data_length;
 	dma_len = ib_sg_dma_len(dev, &sg[0]);
-	riu = ioctx->rdma_ius;
+	riu = ioctx->rdma_wrs;
 
 	/*
 	 * For each remote desc - calculate the #ib_sge.
@@ -1139,9 +1144,9 @@ static int srpt_map_sg_to_ib_sge(struct srpt_rdma_ch *ch,
 	     j < count && i < ioctx->n_rbuf && tsize > 0; ++i, ++riu, ++db) {
 		rsize = be32_to_cpu(db->len);
 		raddr = be64_to_cpu(db->va);
-		riu->raddr = raddr;
+		riu->remote_addr = raddr;
 		riu->rkey = be32_to_cpu(db->key);
-		riu->sge_cnt = 0;
+		riu->wr.num_sge = 0;
 
 		/* calculate how many sge required for this remote_buf */
 		while (rsize > 0 && tsize > 0) {
@@ -1165,33 +1170,35 @@ static int srpt_map_sg_to_ib_sge(struct srpt_rdma_ch *ch,
 				rsize = 0;
 			}
 
-			++riu->sge_cnt;
+			++riu->wr.num_sge;
 
-			if (rsize > 0 && riu->sge_cnt == SRPT_DEF_SG_PER_WQE) {
+			if (rsize > 0 &&
+			    riu->wr.num_sge == SRPT_DEF_SG_PER_WQE) {
 				++ioctx->n_rdma;
-				riu->sge =
-				    kmalloc(riu->sge_cnt * sizeof *riu->sge,
-					    GFP_KERNEL);
-				if (!riu->sge)
+				riu->wr.sg_list = kmalloc_array(riu->wr.num_sge,
+						sizeof(*riu->wr.sg_list),
+						GFP_KERNEL);
+				if (!riu->wr.sg_list)
 					goto free_mem;
 
 				++riu;
-				riu->sge_cnt = 0;
-				riu->raddr = raddr;
+				riu->wr.num_sge = 0;
+				riu->remote_addr = raddr;
 				riu->rkey = be32_to_cpu(db->key);
 			}
 		}
 
 		++ioctx->n_rdma;
-		riu->sge = kmalloc(riu->sge_cnt * sizeof *riu->sge,
-				   GFP_KERNEL);
-		if (!riu->sge)
+		riu->wr.sg_list = kmalloc_array(riu->wr.num_sge,
+					sizeof(*riu->wr.sg_list),
+					GFP_KERNEL);
+		if (!riu->wr.sg_list)
 			goto free_mem;
 	}
 
 	db = ioctx->rbufs;
 	tsize = cmd->data_length;
-	riu = ioctx->rdma_ius;
+	riu = ioctx->rdma_wrs;
 	sg = sg_orig;
 	dma_len = ib_sg_dma_len(dev, &sg[0]);
 	dma_addr = ib_sg_dma_address(dev, &sg[0]);
@@ -1200,7 +1207,7 @@ static int srpt_map_sg_to_ib_sge(struct srpt_rdma_ch *ch,
 	for (i = 0, j = 0;
 	     j < count && i < ioctx->n_rbuf && tsize > 0; ++i, ++riu, ++db) {
 		rsize = be32_to_cpu(db->len);
-		sge = riu->sge;
+		sge = riu->wr.sg_list;
 		k = 0;
 
 		while (rsize > 0 && tsize > 0) {
@@ -1232,9 +1239,9 @@ static int srpt_map_sg_to_ib_sge(struct srpt_rdma_ch *ch,
 			}
 
 			++k;
-			if (k == riu->sge_cnt && rsize > 0 && tsize > 0) {
+			if (k == riu->wr.num_sge && rsize > 0 && tsize > 0) {
 				++riu;
-				sge = riu->sge;
+				sge = riu->wr.sg_list;
 				k = 0;
 			} else if (rsize > 0 && tsize > 0)
 				++sge;
@@ -1277,8 +1284,8 @@ static struct srpt_send_ioctx *srpt_get_send_ioctx(struct srpt_rdma_ch *ch)
 	ioctx->n_rbuf = 0;
 	ioctx->rbufs = NULL;
 	ioctx->n_rdma = 0;
-	ioctx->n_rdma_ius = 0;
-	ioctx->rdma_ius = NULL;
+	ioctx->n_rdma_wrs = 0;
+	ioctx->rdma_wrs = NULL;
 	ioctx->mapped_sg_count = 0;
 	init_completion(&ioctx->tx_done);
 	ioctx->queue_status_only = false;
@@ -1380,118 +1387,44 @@ out:
 }
 
 /**
- * srpt_handle_send_err_comp() - Process an IB_WC_SEND error completion.
- */
-static void srpt_handle_send_err_comp(struct srpt_rdma_ch *ch, u64 wr_id)
-{
-	struct srpt_send_ioctx *ioctx;
-	enum srpt_command_state state;
-	u32 index;
-
-	atomic_inc(&ch->sq_wr_avail);
-
-	index = idx_from_wr_id(wr_id);
-	ioctx = ch->ioctx_ring[index];
-	state = srpt_get_cmd_state(ioctx);
-
-	WARN_ON(state != SRPT_STATE_CMD_RSP_SENT
-		&& state != SRPT_STATE_MGMT_RSP_SENT
-		&& state != SRPT_STATE_NEED_DATA
-		&& state != SRPT_STATE_DONE);
-
-	/* If SRP_RSP sending failed, undo the ch->req_lim change. */
-	if (state == SRPT_STATE_CMD_RSP_SENT
-	    || state == SRPT_STATE_MGMT_RSP_SENT)
-		atomic_dec(&ch->req_lim);
-
-	srpt_abort_cmd(ioctx);
-}
-
-/**
- * srpt_handle_send_comp() - Process an IB send completion notification.
- */
-static void srpt_handle_send_comp(struct srpt_rdma_ch *ch,
-				  struct srpt_send_ioctx *ioctx)
-{
-	enum srpt_command_state state;
-
-	atomic_inc(&ch->sq_wr_avail);
-
-	state = srpt_set_cmd_state(ioctx, SRPT_STATE_DONE);
-
-	if (WARN_ON(state != SRPT_STATE_CMD_RSP_SENT
-		    && state != SRPT_STATE_MGMT_RSP_SENT
-		    && state != SRPT_STATE_DONE))
-		pr_debug("state = %d\n", state);
-
-	if (state != SRPT_STATE_DONE) {
-		srpt_unmap_sg_to_ib_sge(ch, ioctx);
-		transport_generic_free_cmd(&ioctx->cmd, 0);
-	} else {
-		pr_err("IB completion has been received too late for"
-		       " wr_id = %u.\n", ioctx->ioctx.index);
-	}
-}
-
-/**
- * srpt_handle_rdma_comp() - Process an IB RDMA completion notification.
- *
  * XXX: what is now target_execute_cmd used to be asynchronous, and unmapping
  * the data that has been transferred via IB RDMA had to be postponed until the
  * check_stop_free() callback.  None of this is necessary anymore and needs to
  * be cleaned up.
  */
-static void srpt_handle_rdma_comp(struct srpt_rdma_ch *ch,
-				  struct srpt_send_ioctx *ioctx,
-				  enum srpt_opcode opcode)
+static void srpt_rdma_read_done(struct ib_cq *cq, struct ib_wc *wc)
 {
+	struct srpt_rdma_ch *ch = cq->cq_context;
+	struct srpt_send_ioctx *ioctx =
+		container_of(wc->wr_cqe, struct srpt_send_ioctx, rdma_cqe);
+
 	WARN_ON(ioctx->n_rdma <= 0);
 	atomic_add(ioctx->n_rdma, &ch->sq_wr_avail);
 
-	if (opcode == SRPT_RDMA_READ_LAST) {
-		if (srpt_test_and_set_cmd_state(ioctx, SRPT_STATE_NEED_DATA,
-						SRPT_STATE_DATA_IN))
-			target_execute_cmd(&ioctx->cmd);
-		else
-			pr_err("%s[%d]: wrong state = %d\n", __func__,
-			       __LINE__, srpt_get_cmd_state(ioctx));
-	} else if (opcode == SRPT_RDMA_ABORT) {
-		ioctx->rdma_aborted = true;
-	} else {
-		WARN(true, "unexpected opcode %d\n", opcode);
+	if (unlikely(wc->status != IB_WC_SUCCESS)) {
+		pr_info("RDMA_READ for ioctx 0x%p failed with status %d\n",
+			ioctx, wc->status);
+		srpt_abort_cmd(ioctx);
+		return;
 	}
+
+	if (srpt_test_and_set_cmd_state(ioctx, SRPT_STATE_NEED_DATA,
+					SRPT_STATE_DATA_IN))
+		target_execute_cmd(&ioctx->cmd);
+	else
+		pr_err("%s[%d]: wrong state = %d\n", __func__,
+		       __LINE__, srpt_get_cmd_state(ioctx));
 }
 
-/**
- * srpt_handle_rdma_err_comp() - Process an IB RDMA error completion.
- */
-static void srpt_handle_rdma_err_comp(struct srpt_rdma_ch *ch,
-				      struct srpt_send_ioctx *ioctx,
-				      enum srpt_opcode opcode)
+static void srpt_rdma_write_done(struct ib_cq *cq, struct ib_wc *wc)
 {
-	enum srpt_command_state state;
+	struct srpt_send_ioctx *ioctx =
+		container_of(wc->wr_cqe, struct srpt_send_ioctx, rdma_cqe);
 
-	state = srpt_get_cmd_state(ioctx);
-	switch (opcode) {
-	case SRPT_RDMA_READ_LAST:
-		if (ioctx->n_rdma <= 0) {
-			pr_err("Received invalid RDMA read"
-			       " error completion with idx %d\n",
-			       ioctx->ioctx.index);
-			break;
-		}
-		atomic_add(ioctx->n_rdma, &ch->sq_wr_avail);
-		if (state == SRPT_STATE_NEED_DATA)
-			srpt_abort_cmd(ioctx);
-		else
-			pr_err("%s[%d]: wrong state = %d\n",
-			       __func__, __LINE__, state);
-		break;
-	case SRPT_RDMA_WRITE_LAST:
-		break;
-	default:
-		pr_err("%s[%d]: opcode = %u\n", __func__, __LINE__, opcode);
-		break;
+	if (unlikely(wc->status != IB_WC_SUCCESS)) {
+		pr_info("RDMA_WRITE for ioctx 0x%p failed with status %d\n",
+			ioctx, wc->status);
+		srpt_abort_cmd(ioctx);
 	}
 }
 
@@ -1926,32 +1859,26 @@ out:
 	return;
 }
 
-static void srpt_process_rcv_completion(struct ib_cq *cq,
-					struct srpt_rdma_ch *ch,
-					struct ib_wc *wc)
+static void srpt_recv_done(struct ib_cq *cq, struct ib_wc *wc)
 {
-	struct srpt_device *sdev = ch->sport->sdev;
-	struct srpt_recv_ioctx *ioctx;
-	u32 index;
+	struct srpt_rdma_ch *ch = cq->cq_context;
+	struct srpt_recv_ioctx *ioctx =
+		container_of(wc->wr_cqe, struct srpt_recv_ioctx, ioctx.cqe);
 
-	index = idx_from_wr_id(wc->wr_id);
 	if (wc->status == IB_WC_SUCCESS) {
 		int req_lim;
 
 		req_lim = atomic_dec_return(&ch->req_lim);
 		if (unlikely(req_lim < 0))
 			pr_err("req_lim = %d < 0\n", req_lim);
-		ioctx = sdev->ioctx_ring[index];
 		srpt_handle_new_iu(ch, ioctx, NULL);
 	} else {
-		pr_info("receiving failed for idx %u with status %d\n",
-			index, wc->status);
+		pr_info("receiving failed for ioctx %p with status %d\n",
+			ioctx, wc->status);
 	}
 }
 
 /**
- * srpt_process_send_completion() - Process an IB send completion.
- *
  * Note: Although this has not yet been observed during tests, at least in
  * theory it is possible that the srpt_get_send_ioctx() call invoked by
  * srpt_handle_new_iu() fails. This is possible because the req_lim_delta
@@ -1964,109 +1891,52 @@ static void srpt_process_rcv_completion(struct ib_cq *cq,
  * are queued on cmd_wait_list. The code below processes these delayed
  * requests one at a time.
  */
-static void srpt_process_send_completion(struct ib_cq *cq,
-					 struct srpt_rdma_ch *ch,
-					 struct ib_wc *wc)
+static void srpt_send_done(struct ib_cq *cq, struct ib_wc *wc)
 {
-	struct srpt_send_ioctx *send_ioctx;
-	uint32_t index;
-	enum srpt_opcode opcode;
+	struct srpt_rdma_ch *ch = cq->cq_context;
+	struct srpt_send_ioctx *ioctx =
+		container_of(wc->wr_cqe, struct srpt_send_ioctx, ioctx.cqe);
+	enum srpt_command_state state;
 
-	index = idx_from_wr_id(wc->wr_id);
-	opcode = opcode_from_wr_id(wc->wr_id);
-	send_ioctx = ch->ioctx_ring[index];
-	if (wc->status == IB_WC_SUCCESS) {
-		if (opcode == SRPT_SEND)
-			srpt_handle_send_comp(ch, send_ioctx);
-		else {
-			WARN_ON(opcode != SRPT_RDMA_ABORT &&
-				wc->opcode != IB_WC_RDMA_READ);
-			srpt_handle_rdma_comp(ch, send_ioctx, opcode);
-		}
+	state = srpt_set_cmd_state(ioctx, SRPT_STATE_DONE);
+
+	WARN_ON(state != SRPT_STATE_CMD_RSP_SENT &&
+		state != SRPT_STATE_MGMT_RSP_SENT);
+
+	atomic_inc(&ch->sq_wr_avail);
+
+	if (wc->status != IB_WC_SUCCESS) {
+		pr_info("sending response for ioctx 0x%p failed"
+			" with status %d\n", ioctx, wc->status);
+
+		atomic_dec(&ch->req_lim);
+		srpt_abort_cmd(ioctx);
+		goto out;
+	}
+
+	if (state != SRPT_STATE_DONE) {
+		srpt_unmap_sg_to_ib_sge(ch, ioctx);
+		transport_generic_free_cmd(&ioctx->cmd, 0);
 	} else {
-		if (opcode == SRPT_SEND) {
-			pr_info("sending response for idx %u failed"
-				" with status %d\n", index, wc->status);
-			srpt_handle_send_err_comp(ch, wc->wr_id);
-		} else if (opcode != SRPT_RDMA_MID) {
-			pr_info("RDMA t %d for idx %u failed with"
-				" status %d\n", opcode, index, wc->status);
-			srpt_handle_rdma_err_comp(ch, send_ioctx, opcode);
-		}
+		pr_err("IB completion has been received too late for"
+		       " wr_id = %u.\n", ioctx->ioctx.index);
 	}
 
-	while (unlikely(opcode == SRPT_SEND
-			&& !list_empty(&ch->cmd_wait_list)
-			&& srpt_get_ch_state(ch) == CH_LIVE
-			&& (send_ioctx = srpt_get_send_ioctx(ch)) != NULL)) {
+out:
+	while (!list_empty(&ch->cmd_wait_list) &&
+	       srpt_get_ch_state(ch) == CH_LIVE &&
+	       (ioctx = srpt_get_send_ioctx(ch)) != NULL) {
 		struct srpt_recv_ioctx *recv_ioctx;
 
 		recv_ioctx = list_first_entry(&ch->cmd_wait_list,
 					      struct srpt_recv_ioctx,
 					      wait_list);
 		list_del(&recv_ioctx->wait_list);
-		srpt_handle_new_iu(ch, recv_ioctx, send_ioctx);
-	}
-}
-
-static void srpt_process_completion(struct ib_cq *cq, struct srpt_rdma_ch *ch)
-{
-	struct ib_wc *const wc = ch->wc;
-	int i, n;
-
-	WARN_ON(cq != ch->cq);
-
-	ib_req_notify_cq(cq, IB_CQ_NEXT_COMP);
-	while ((n = ib_poll_cq(cq, ARRAY_SIZE(ch->wc), wc)) > 0) {
-		for (i = 0; i < n; i++) {
-			if (opcode_from_wr_id(wc[i].wr_id) == SRPT_RECV)
-				srpt_process_rcv_completion(cq, ch, &wc[i]);
-			else
-				srpt_process_send_completion(cq, ch, &wc[i]);
-		}
+		srpt_handle_new_iu(ch, recv_ioctx, ioctx);
 	}
 }
 
 /**
- * srpt_completion() - IB completion queue callback function.
- *
- * Notes:
- * - It is guaranteed that a completion handler will never be invoked
- *   concurrently on two different CPUs for the same completion queue. See also
- *   Documentation/infiniband/core_locking.txt and the implementation of
- *   handle_edge_irq() in kernel/irq/chip.c.
- * - When threaded IRQs are enabled, completion handlers are invoked in thread
- *   context instead of interrupt context.
- */
-static void srpt_completion(struct ib_cq *cq, void *ctx)
-{
-	struct srpt_rdma_ch *ch = ctx;
-
-	wake_up_interruptible(&ch->wait_queue);
-}
-
-static int srpt_compl_thread(void *arg)
-{
-	struct srpt_rdma_ch *ch;
-
-	/* Hibernation / freezing of the SRPT kernel thread is not supported. */
-	current->flags |= PF_NOFREEZE;
-
-	ch = arg;
-	BUG_ON(!ch);
-	pr_info("Session %s: kernel thread %s (PID %d) started\n",
-		ch->sess_name, ch->thread->comm, current->pid);
-	while (!kthread_should_stop()) {
-		wait_event_interruptible(ch->wait_queue,
-			(srpt_process_completion(ch->cq, ch),
-			 kthread_should_stop()));
-	}
-	pr_info("Session %s: kernel thread %s (PID %d) stopped\n",
-		ch->sess_name, ch->thread->comm, current->pid);
-	return 0;
-}
-
-/**
  * srpt_create_ch_ib() - Create receive and send completion queues.
  */
 static int srpt_create_ch_ib(struct srpt_rdma_ch *ch)
@@ -2075,7 +1945,6 @@ static int srpt_create_ch_ib(struct srpt_rdma_ch *ch)
 	struct srpt_port *sport = ch->sport;
 	struct srpt_device *sdev = sport->sdev;
 	u32 srp_sq_size = sport->port_attrib.srp_sq_size;
-	struct ib_cq_init_attr cq_attr = {};
 	int ret;
 
 	WARN_ON(ch->rq_size < 1);
@@ -2086,9 +1955,8 @@ static int srpt_create_ch_ib(struct srpt_rdma_ch *ch)
 		goto out;
 
 retry:
-	cq_attr.cqe = ch->rq_size + srp_sq_size;
-	ch->cq = ib_create_cq(sdev->device, srpt_completion, NULL, ch,
-			      &cq_attr);
+	ch->cq = ib_alloc_cq(sdev->device, ch, ch->rq_size + srp_sq_size,
+			0 /* XXX: spread CQs */, IB_POLL_WORKQUEUE);
 	if (IS_ERR(ch->cq)) {
 		ret = PTR_ERR(ch->cq);
 		pr_err("failed to create CQ cqe= %d ret= %d\n",
@@ -2131,18 +1999,6 @@ retry:
 	if (ret)
 		goto err_destroy_qp;
 
-	init_waitqueue_head(&ch->wait_queue);
-
-	pr_debug("creating thread for session %s\n", ch->sess_name);
-
-	ch->thread = kthread_run(srpt_compl_thread, ch, "ib_srpt_compl");
-	if (IS_ERR(ch->thread)) {
-		pr_err("failed to create kernel thread %ld\n",
-		       PTR_ERR(ch->thread));
-		ch->thread = NULL;
-		goto err_destroy_qp;
-	}
-
 out:
 	kfree(qp_init);
 	return ret;
@@ -2150,17 +2006,14 @@ out:
 err_destroy_qp:
 	ib_destroy_qp(ch->qp);
 err_destroy_cq:
-	ib_destroy_cq(ch->cq);
+	ib_free_cq(ch->cq);
 	goto out;
 }
 
 static void srpt_destroy_ch_ib(struct srpt_rdma_ch *ch)
 {
-	if (ch->thread)
-		kthread_stop(ch->thread);
-
 	ib_destroy_qp(ch->qp);
-	ib_destroy_cq(ch->cq);
+	ib_free_cq(ch->cq);
 }
 
 /**
@@ -2808,12 +2661,8 @@ static int srpt_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
 static int srpt_perform_rdmas(struct srpt_rdma_ch *ch,
 			      struct srpt_send_ioctx *ioctx)
 {
-	struct ib_rdma_wr wr;
 	struct ib_send_wr *bad_wr;
-	struct rdma_iu *riu;
-	int i;
-	int ret;
-	int sq_wr_avail;
+	int sq_wr_avail, ret, i;
 	enum dma_data_direction dir;
 	const int n_rdma = ioctx->n_rdma;
 
@@ -2829,59 +2678,32 @@ static int srpt_perform_rdmas(struct srpt_rdma_ch *ch,
 		}
 	}
 
-	ioctx->rdma_aborted = false;
-	ret = 0;
-	riu = ioctx->rdma_ius;
-	memset(&wr, 0, sizeof wr);
-
-	for (i = 0; i < n_rdma; ++i, ++riu) {
-		if (dir == DMA_FROM_DEVICE) {
-			wr.wr.opcode = IB_WR_RDMA_WRITE;
-			wr.wr.wr_id = encode_wr_id(i == n_rdma - 1 ?
-						SRPT_RDMA_WRITE_LAST :
-						SRPT_RDMA_MID,
-						ioctx->ioctx.index);
-		} else {
-			wr.wr.opcode = IB_WR_RDMA_READ;
-			wr.wr.wr_id = encode_wr_id(i == n_rdma - 1 ?
-						SRPT_RDMA_READ_LAST :
-						SRPT_RDMA_MID,
-						ioctx->ioctx.index);
-		}
-		wr.wr.next = NULL;
-		wr.remote_addr = riu->raddr;
-		wr.rkey = riu->rkey;
-		wr.wr.num_sge = riu->sge_cnt;
-		wr.wr.sg_list = riu->sge;
+	for (i = 0; i < n_rdma; i++) {
+		struct ib_send_wr *wr = &ioctx->rdma_wrs[i].wr;
 
-		/* only get completion event for the last rdma write */
-		if (i == (n_rdma - 1) && dir == DMA_TO_DEVICE)
-			wr.wr.send_flags = IB_SEND_SIGNALED;
+		wr->opcode = (dir == DMA_FROM_DEVICE) ?
+				IB_WR_RDMA_WRITE : IB_WR_RDMA_READ;
 
-		ret = ib_post_send(ch->qp, &wr.wr, &bad_wr);
-		if (ret)
-			break;
+		if (i == n_rdma - 1) {
+			/* only get completion event for the last rdma read */
+			if (dir == DMA_TO_DEVICE) {
+				wr->send_flags = IB_SEND_SIGNALED;
+				ioctx->rdma_cqe.done = srpt_rdma_read_done;
+			} else {
+				ioctx->rdma_cqe.done = srpt_rdma_write_done;
+			}
+			wr->wr_cqe = &ioctx->rdma_cqe;
+			wr->next = NULL;
+		} else {
+			wr->wr_cqe = NULL;
+			wr->next = &ioctx->rdma_wrs[i + 1].wr;
+		}
 	}
 
+	ret = ib_post_send(ch->qp, &ioctx->rdma_wrs->wr, &bad_wr);
 	if (ret)
 		pr_err("%s[%d]: ib_post_send() returned %d for %d/%d\n",
 				 __func__, __LINE__, ret, i, n_rdma);
-	if (ret && i > 0) {
-		wr.wr.num_sge = 0;
-		wr.wr.wr_id = encode_wr_id(SRPT_RDMA_ABORT, ioctx->ioctx.index);
-		wr.wr.send_flags = IB_SEND_SIGNALED;
-		while (ch->state == CH_LIVE &&
-			ib_post_send(ch->qp, &wr.wr, &bad_wr) != 0) {
-			pr_info("Trying to abort failed RDMA transfer [%d]\n",
-				ioctx->ioctx.index);
-			msleep(1000);
-		}
-		while (ch->state != CH_RELEASING && !ioctx->rdma_aborted) {
-			pr_info("Waiting until RDMA abort finished [%d]\n",
-				ioctx->ioctx.index);
-			msleep(1000);
-		}
-	}
 out:
 	if (unlikely(dir == DMA_TO_DEVICE && ret < 0))
 		atomic_add(n_rdma, &ch->sq_wr_avail);
@@ -3190,14 +3012,11 @@ static void srpt_add_one(struct ib_device *device)
 	init_waitqueue_head(&sdev->ch_releaseQ);
 	spin_lock_init(&sdev->spinlock);
 
-	if (ib_query_device(device, &sdev->dev_attr))
-		goto free_dev;
-
 	sdev->pd = ib_alloc_pd(device);
 	if (IS_ERR(sdev->pd))
 		goto free_dev;
 
-	sdev->srq_size = min(srpt_srq_size, sdev->dev_attr.max_srq_wr);
+	sdev->srq_size = min(srpt_srq_size, sdev->device->attrs.max_srq_wr);
 
 	srq_attr.event_handler = srpt_srq_event;
 	srq_attr.srq_context = (void *)sdev;
@@ -3211,7 +3030,7 @@ static void srpt_add_one(struct ib_device *device)
 		goto err_pd;
 
 	pr_debug("%s: create SRQ #wr= %d max_allow=%d dev= %s\n",
-		 __func__, sdev->srq_size, sdev->dev_attr.max_srq_wr,
+		 __func__, sdev->srq_size, sdev->device->attrs.max_srq_wr,
 		 device->name);
 
 	if (!srpt_service_guid)