RDMA/efa: Implement functions that submit and complete admin commands

Add admin commands submissions/completions implementation.

Signed-off-by: Gal Pressman <galpress@amazon.com>
Reviewed-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

1 files changed, 1160 insertions, 0 deletions

diff --git a/drivers/infiniband/hw/efa/efa_com.c b/drivers/infiniband/hw/efa/efa_com.c
new file mode 100644
index 000000000000..a5c788741a04
--- /dev/null
+++ b/drivers/infiniband/hw/efa/efa_com.c
@@ -0,0 +1,1160 @@
+// SPDX-License-Identifier: GPL-2.0 OR BSD-2-Clause
+/*
+ * Copyright 2018-2019 Amazon.com, Inc. or its affiliates. All rights reserved.
+ */
+
+#include "efa_com.h"
+#include "efa_regs_defs.h"
+
+#define ADMIN_CMD_TIMEOUT_US 30000000 /* usecs */
+
+#define EFA_REG_READ_TIMEOUT_US 50000 /* usecs */
+#define EFA_MMIO_READ_INVALID 0xffffffff
+
+#define EFA_POLL_INTERVAL_MS 100 /* msecs */
+
+#define EFA_ASYNC_QUEUE_DEPTH 16
+#define EFA_ADMIN_QUEUE_DEPTH 32
+
+#define MIN_EFA_VER\
+	((EFA_ADMIN_API_VERSION_MAJOR << EFA_REGS_VERSION_MAJOR_VERSION_SHIFT) | \
+	 (EFA_ADMIN_API_VERSION_MINOR & EFA_REGS_VERSION_MINOR_VERSION_MASK))
+
+#define EFA_CTRL_MAJOR          0
+#define EFA_CTRL_MINOR          0
+#define EFA_CTRL_SUB_MINOR      1
+
+#define MIN_EFA_CTRL_VER \
+	(((EFA_CTRL_MAJOR) << \
+	(EFA_REGS_CONTROLLER_VERSION_MAJOR_VERSION_SHIFT)) | \
+	((EFA_CTRL_MINOR) << \
+	(EFA_REGS_CONTROLLER_VERSION_MINOR_VERSION_SHIFT)) | \
+	(EFA_CTRL_SUB_MINOR))
+
+#define EFA_DMA_ADDR_TO_UINT32_LOW(x)   ((u32)((u64)(x)))
+#define EFA_DMA_ADDR_TO_UINT32_HIGH(x)  ((u32)(((u64)(x)) >> 32))
+
+#define EFA_REGS_ADMIN_INTR_MASK 1
+
+enum efa_cmd_status {
+	EFA_CMD_SUBMITTED,
+	EFA_CMD_COMPLETED,
+	/* Abort - canceled by the driver */
+	EFA_CMD_ABORTED,
+};
+
+struct efa_comp_ctx {
+	struct completion wait_event;
+	struct efa_admin_acq_entry *user_cqe;
+	u32 comp_size;
+	enum efa_cmd_status status;
+	/* status from the device */
+	u8 comp_status;
+	u8 cmd_opcode;
+	u8 occupied;
+};
+
+static const char *efa_com_cmd_str(u8 cmd)
+{
+#define EFA_CMD_STR_CASE(_cmd) case EFA_ADMIN_##_cmd: return #_cmd
+
+	switch (cmd) {
+	EFA_CMD_STR_CASE(CREATE_QP);
+	EFA_CMD_STR_CASE(MODIFY_QP);
+	EFA_CMD_STR_CASE(QUERY_QP);
+	EFA_CMD_STR_CASE(DESTROY_QP);
+	EFA_CMD_STR_CASE(CREATE_AH);
+	EFA_CMD_STR_CASE(DESTROY_AH);
+	EFA_CMD_STR_CASE(REG_MR);
+	EFA_CMD_STR_CASE(DEREG_MR);
+	EFA_CMD_STR_CASE(CREATE_CQ);
+	EFA_CMD_STR_CASE(DESTROY_CQ);
+	EFA_CMD_STR_CASE(GET_FEATURE);
+	EFA_CMD_STR_CASE(SET_FEATURE);
+	EFA_CMD_STR_CASE(GET_STATS);
+	EFA_CMD_STR_CASE(ALLOC_PD);
+	EFA_CMD_STR_CASE(DEALLOC_PD);
+	EFA_CMD_STR_CASE(ALLOC_UAR);
+	EFA_CMD_STR_CASE(DEALLOC_UAR);
+	default: return "unknown command opcode";
+	}
+#undef EFA_CMD_STR_CASE
+}
+
+static u32 efa_com_reg_read32(struct efa_com_dev *edev, u16 offset)
+{
+	struct efa_com_mmio_read *mmio_read = &edev->mmio_read;
+	struct efa_admin_mmio_req_read_less_resp *read_resp;
+	unsigned long exp_time;
+	u32 mmio_read_reg;
+	u32 err;
+
+	read_resp = mmio_read->read_resp;
+
+	spin_lock(&mmio_read->lock);
+	mmio_read->seq_num++;
+
+	/* trash DMA req_id to identify when hardware is done */
+	read_resp->req_id = mmio_read->seq_num + 0x9aL;
+	mmio_read_reg = (offset << EFA_REGS_MMIO_REG_READ_REG_OFF_SHIFT) &
+			EFA_REGS_MMIO_REG_READ_REG_OFF_MASK;
+	mmio_read_reg |= mmio_read->seq_num &
+			 EFA_REGS_MMIO_REG_READ_REQ_ID_MASK;
+
+	writel(mmio_read_reg, edev->reg_bar + EFA_REGS_MMIO_REG_READ_OFF);
+
+	exp_time = jiffies + usecs_to_jiffies(mmio_read->mmio_read_timeout);
+	do {
+		if (READ_ONCE(read_resp->req_id) == mmio_read->seq_num)
+			break;
+		udelay(1);
+	} while (time_is_after_jiffies(exp_time));
+
+	if (read_resp->req_id != mmio_read->seq_num) {
+		ibdev_err(edev->efa_dev,
+			  "Reading register timed out. expected: req id[%u] offset[%#x] actual: req id[%u] offset[%#x]\n",
+			  mmio_read->seq_num, offset, read_resp->req_id,
+			  read_resp->reg_off);
+		err = EFA_MMIO_READ_INVALID;
+		goto out;
+	}
+
+	if (read_resp->reg_off != offset) {
+		ibdev_err(edev->efa_dev,
+			  "Reading register failed: wrong offset provided\n");
+		err = EFA_MMIO_READ_INVALID;
+		goto out;
+	}
+
+	err = read_resp->reg_val;
+out:
+	spin_unlock(&mmio_read->lock);
+	return err;
+}
+
+static int efa_com_admin_init_sq(struct efa_com_dev *edev)
+{
+	struct efa_com_admin_queue *aq = &edev->aq;
+	struct efa_com_admin_sq *sq = &aq->sq;
+	u16 size = aq->depth * sizeof(*sq->entries);
+	u32 addr_high;
+	u32 addr_low;
+	u32 aq_caps;
+
+	sq->entries =
+		dma_alloc_coherent(aq->dmadev, size, &sq->dma_addr, GFP_KERNEL);
+	if (!sq->entries)
+		return -ENOMEM;
+
+	spin_lock_init(&sq->lock);
+
+	sq->cc = 0;
+	sq->pc = 0;
+	sq->phase = 1;
+
+	sq->db_addr = (u32 __iomem *)(edev->reg_bar + EFA_REGS_AQ_PROD_DB_OFF);
+
+	addr_high = EFA_DMA_ADDR_TO_UINT32_HIGH(sq->dma_addr);
+	addr_low = EFA_DMA_ADDR_TO_UINT32_LOW(sq->dma_addr);
+
+	writel(addr_low, edev->reg_bar + EFA_REGS_AQ_BASE_LO_OFF);
+	writel(addr_high, edev->reg_bar + EFA_REGS_AQ_BASE_HI_OFF);
+
+	aq_caps = aq->depth & EFA_REGS_AQ_CAPS_AQ_DEPTH_MASK;
+	aq_caps |= (sizeof(struct efa_admin_aq_entry) <<
+			EFA_REGS_AQ_CAPS_AQ_ENTRY_SIZE_SHIFT) &
+			EFA_REGS_AQ_CAPS_AQ_ENTRY_SIZE_MASK;
+
+	writel(aq_caps, edev->reg_bar + EFA_REGS_AQ_CAPS_OFF);
+
+	return 0;
+}
+
+static int efa_com_admin_init_cq(struct efa_com_dev *edev)
+{
+	struct efa_com_admin_queue *aq = &edev->aq;
+	struct efa_com_admin_cq *cq = &aq->cq;
+	u16 size = aq->depth * sizeof(*cq->entries);
+	u32 addr_high;
+	u32 addr_low;
+	u32 acq_caps;
+
+	cq->entries =
+		dma_alloc_coherent(aq->dmadev, size, &cq->dma_addr, GFP_KERNEL);
+	if (!cq->entries)
+		return -ENOMEM;
+
+	spin_lock_init(&cq->lock);
+
+	cq->cc = 0;
+	cq->phase = 1;
+
+	addr_high = EFA_DMA_ADDR_TO_UINT32_HIGH(cq->dma_addr);
+	addr_low = EFA_DMA_ADDR_TO_UINT32_LOW(cq->dma_addr);
+
+	writel(addr_low, edev->reg_bar + EFA_REGS_ACQ_BASE_LO_OFF);
+	writel(addr_high, edev->reg_bar + EFA_REGS_ACQ_BASE_HI_OFF);
+
+	acq_caps = aq->depth & EFA_REGS_ACQ_CAPS_ACQ_DEPTH_MASK;
+	acq_caps |= (sizeof(struct efa_admin_acq_entry) <<
+			EFA_REGS_ACQ_CAPS_ACQ_ENTRY_SIZE_SHIFT) &
+			EFA_REGS_ACQ_CAPS_ACQ_ENTRY_SIZE_MASK;
+	acq_caps |= (aq->msix_vector_idx <<
+			EFA_REGS_ACQ_CAPS_ACQ_MSIX_VECTOR_SHIFT) &
+			EFA_REGS_ACQ_CAPS_ACQ_MSIX_VECTOR_MASK;
+
+	writel(acq_caps, edev->reg_bar + EFA_REGS_ACQ_CAPS_OFF);
+
+	return 0;
+}
+
+static int efa_com_admin_init_aenq(struct efa_com_dev *edev,
+				   struct efa_aenq_handlers *aenq_handlers)
+{
+	struct efa_com_aenq *aenq = &edev->aenq;
+	u32 addr_low, addr_high, aenq_caps;
+	u16 size;
+
+	if (!aenq_handlers) {
+		ibdev_err(edev->efa_dev, "aenq handlers pointer is NULL\n");
+		return -EINVAL;
+	}
+
+	size = EFA_ASYNC_QUEUE_DEPTH * sizeof(*aenq->entries);
+	aenq->entries = dma_alloc_coherent(edev->dmadev, size, &aenq->dma_addr,
+					   GFP_KERNEL);
+	if (!aenq->entries)
+		return -ENOMEM;
+
+	aenq->aenq_handlers = aenq_handlers;
+	aenq->depth = EFA_ASYNC_QUEUE_DEPTH;
+	aenq->cc = 0;
+	aenq->phase = 1;
+
+	addr_low = EFA_DMA_ADDR_TO_UINT32_LOW(aenq->dma_addr);
+	addr_high = EFA_DMA_ADDR_TO_UINT32_HIGH(aenq->dma_addr);
+
+	writel(addr_low, edev->reg_bar + EFA_REGS_AENQ_BASE_LO_OFF);
+	writel(addr_high, edev->reg_bar + EFA_REGS_AENQ_BASE_HI_OFF);
+
+	aenq_caps = aenq->depth & EFA_REGS_AENQ_CAPS_AENQ_DEPTH_MASK;
+	aenq_caps |= (sizeof(struct efa_admin_aenq_entry) <<
+		EFA_REGS_AENQ_CAPS_AENQ_ENTRY_SIZE_SHIFT) &
+		EFA_REGS_AENQ_CAPS_AENQ_ENTRY_SIZE_MASK;
+	aenq_caps |= (aenq->msix_vector_idx
+		      << EFA_REGS_AENQ_CAPS_AENQ_MSIX_VECTOR_SHIFT) &
+		     EFA_REGS_AENQ_CAPS_AENQ_MSIX_VECTOR_MASK;
+	writel(aenq_caps, edev->reg_bar + EFA_REGS_AENQ_CAPS_OFF);
+
+	/*
+	 * Init cons_db to mark that all entries in the queue
+	 * are initially available
+	 */
+	writel(edev->aenq.cc, edev->reg_bar + EFA_REGS_AENQ_CONS_DB_OFF);
+
+	return 0;
+}
+
+/* ID to be used with efa_com_get_comp_ctx */
+static u16 efa_com_alloc_ctx_id(struct efa_com_admin_queue *aq)
+{
+	u16 ctx_id;
+
+	spin_lock(&aq->comp_ctx_lock);
+	ctx_id = aq->comp_ctx_pool[aq->comp_ctx_pool_next];
+	aq->comp_ctx_pool_next++;
+	spin_unlock(&aq->comp_ctx_lock);
+
+	return ctx_id;
+}
+
+static void efa_com_dealloc_ctx_id(struct efa_com_admin_queue *aq,
+				   u16 ctx_id)
+{
+	spin_lock(&aq->comp_ctx_lock);
+	aq->comp_ctx_pool_next--;
+	aq->comp_ctx_pool[aq->comp_ctx_pool_next] = ctx_id;
+	spin_unlock(&aq->comp_ctx_lock);
+}
+
+static inline void efa_com_put_comp_ctx(struct efa_com_admin_queue *aq,
+					struct efa_comp_ctx *comp_ctx)
+{
+	u16 comp_id = comp_ctx->user_cqe->acq_common_descriptor.command &
+		      EFA_ADMIN_ACQ_COMMON_DESC_COMMAND_ID_MASK;
+
+	ibdev_dbg(aq->efa_dev, "Putting completion command_id %d\n", comp_id);
+	comp_ctx->occupied = 0;
+	efa_com_dealloc_ctx_id(aq, comp_id);
+}
+
+static struct efa_comp_ctx *efa_com_get_comp_ctx(struct efa_com_admin_queue *aq,
+						 u16 command_id, bool capture)
+{
+	if (command_id >= aq->depth) {
+		ibdev_err(aq->efa_dev,
+			  "command id is larger than the queue size. cmd_id: %u queue size %d\n",
+			  command_id, aq->depth);
+		return NULL;
+	}
+
+	if (aq->comp_ctx[command_id].occupied && capture) {
+		ibdev_err(aq->efa_dev, "Completion context is occupied\n");
+		return NULL;
+	}
+
+	if (capture) {
+		aq->comp_ctx[command_id].occupied = 1;
+		ibdev_dbg(aq->efa_dev, "Taking completion ctxt command_id %d\n",
+			  command_id);
+	}
+
+	return &aq->comp_ctx[command_id];
+}
+
+static struct efa_comp_ctx *__efa_com_submit_admin_cmd(struct efa_com_admin_queue *aq,
+						       struct efa_admin_aq_entry *cmd,
+						       size_t cmd_size_in_bytes,
+						       struct efa_admin_acq_entry *comp,
+						       size_t comp_size_in_bytes)
+{
+	struct efa_comp_ctx *comp_ctx;
+	u16 queue_size_mask;
+	u16 ctx_id;
+	u16 pi;
+
+	queue_size_mask = aq->depth - 1;
+	pi = aq->sq.pc & queue_size_mask;
+
+	ctx_id = efa_com_alloc_ctx_id(aq);
+
+	cmd->aq_common_descriptor.flags |= aq->sq.phase &
+		EFA_ADMIN_AQ_COMMON_DESC_PHASE_MASK;
+
+	cmd->aq_common_descriptor.command_id |= ctx_id &
+		EFA_ADMIN_AQ_COMMON_DESC_COMMAND_ID_MASK;
+
+	comp_ctx = efa_com_get_comp_ctx(aq, ctx_id, true);
+	if (!comp_ctx) {
+		efa_com_dealloc_ctx_id(aq, ctx_id);
+		return ERR_PTR(-EINVAL);
+	}
+
+	comp_ctx->status = EFA_CMD_SUBMITTED;
+	comp_ctx->comp_size = comp_size_in_bytes;
+	comp_ctx->user_cqe = comp;
+	comp_ctx->cmd_opcode = cmd->aq_common_descriptor.opcode;
+
+	reinit_completion(&comp_ctx->wait_event);
+
+	memcpy(&aq->sq.entries[pi], cmd, cmd_size_in_bytes);
+
+	aq->sq.pc++;
+	atomic64_inc(&aq->stats.submitted_cmd);
+
+	if ((aq->sq.pc & queue_size_mask) == 0)
+		aq->sq.phase = !aq->sq.phase;
+
+	/* barrier not needed in case of writel */
+	writel(aq->sq.pc, aq->sq.db_addr);
+
+	return comp_ctx;
+}
+
+static inline int efa_com_init_comp_ctxt(struct efa_com_admin_queue *aq)
+{
+	size_t pool_size = aq->depth * sizeof(*aq->comp_ctx_pool);
+	size_t size = aq->depth * sizeof(struct efa_comp_ctx);
+	struct efa_comp_ctx *comp_ctx;
+	u16 i;
+
+	aq->comp_ctx = devm_kzalloc(aq->dmadev, size, GFP_KERNEL);
+	aq->comp_ctx_pool = devm_kzalloc(aq->dmadev, pool_size, GFP_KERNEL);
+	if (!aq->comp_ctx || !aq->comp_ctx_pool) {
+		devm_kfree(aq->dmadev, aq->comp_ctx_pool);
+		devm_kfree(aq->dmadev, aq->comp_ctx);
+		return -ENOMEM;
+	}
+
+	for (i = 0; i < aq->depth; i++) {
+		comp_ctx = efa_com_get_comp_ctx(aq, i, false);
+		if (comp_ctx)
+			init_completion(&comp_ctx->wait_event);
+
+		aq->comp_ctx_pool[i] = i;
+	}
+
+	spin_lock_init(&aq->comp_ctx_lock);
+
+	aq->comp_ctx_pool_next = 0;
+
+	return 0;
+}
+
+static struct efa_comp_ctx *efa_com_submit_admin_cmd(struct efa_com_admin_queue *aq,
+						     struct efa_admin_aq_entry *cmd,
+						     size_t cmd_size_in_bytes,
+						     struct efa_admin_acq_entry *comp,
+						     size_t comp_size_in_bytes)
+{
+	struct efa_comp_ctx *comp_ctx;
+
+	spin_lock(&aq->sq.lock);
+	if (!test_bit(EFA_AQ_STATE_RUNNING_BIT, &aq->state)) {
+		ibdev_err(aq->efa_dev, "Admin queue is closed\n");
+		spin_unlock(&aq->sq.lock);
+		return ERR_PTR(-ENODEV);
+	}
+
+	comp_ctx = __efa_com_submit_admin_cmd(aq, cmd, cmd_size_in_bytes, comp,
+					      comp_size_in_bytes);
+	spin_unlock(&aq->sq.lock);
+	if (IS_ERR(comp_ctx))
+		clear_bit(EFA_AQ_STATE_RUNNING_BIT, &aq->state);
+
+	return comp_ctx;
+}
+
+static void efa_com_handle_single_admin_completion(struct efa_com_admin_queue *aq,
+						   struct efa_admin_acq_entry *cqe)
+{
+	struct efa_comp_ctx *comp_ctx;
+	u16 cmd_id;
+
+	cmd_id = cqe->acq_common_descriptor.command &
+		 EFA_ADMIN_ACQ_COMMON_DESC_COMMAND_ID_MASK;
+
+	comp_ctx = efa_com_get_comp_ctx(aq, cmd_id, false);
+	if (!comp_ctx) {
+		ibdev_err(aq->efa_dev,
+			  "comp_ctx is NULL. Changing the admin queue running state\n");
+		clear_bit(EFA_AQ_STATE_RUNNING_BIT, &aq->state);
+		return;
+	}
+
+	comp_ctx->status = EFA_CMD_COMPLETED;
+	comp_ctx->comp_status = cqe->acq_common_descriptor.status;
+	if (comp_ctx->user_cqe)
+		memcpy(comp_ctx->user_cqe, cqe, comp_ctx->comp_size);
+
+	if (!test_bit(EFA_AQ_STATE_POLLING_BIT, &aq->state))
+		complete(&comp_ctx->wait_event);
+}
+
+static void efa_com_handle_admin_completion(struct efa_com_admin_queue *aq)
+{
+	struct efa_admin_acq_entry *cqe;
+	u16 queue_size_mask;
+	u16 comp_num = 0;
+	u8 phase;
+	u16 ci;
+
+	queue_size_mask = aq->depth - 1;
+
+	ci = aq->cq.cc & queue_size_mask;
+	phase = aq->cq.phase;
+
+	cqe = &aq->cq.entries[ci];
+
+	/* Go over all the completions */
+	while ((READ_ONCE(cqe->acq_common_descriptor.flags) &
+		EFA_ADMIN_ACQ_COMMON_DESC_PHASE_MASK) == phase) {
+		/*
+		 * Do not read the rest of the completion entry before the
+		 * phase bit was validated
+		 */
+		dma_rmb();
+		efa_com_handle_single_admin_completion(aq, cqe);
+
+		ci++;
+		comp_num++;
+		if (ci == aq->depth) {
+			ci = 0;
+			phase = !phase;
+		}
+
+		cqe = &aq->cq.entries[ci];
+	}
+
+	aq->cq.cc += comp_num;
+	aq->cq.phase = phase;
+	aq->sq.cc += comp_num;
+	atomic64_add(comp_num, &aq->stats.completed_cmd);
+}
+
+static int efa_com_comp_status_to_errno(u8 comp_status)
+{
+	switch (comp_status) {
+	case EFA_ADMIN_SUCCESS:
+		return 0;
+	case EFA_ADMIN_RESOURCE_ALLOCATION_FAILURE:
+		return -ENOMEM;
+	case EFA_ADMIN_UNSUPPORTED_OPCODE:
+		return -EOPNOTSUPP;
+	case EFA_ADMIN_BAD_OPCODE:
+	case EFA_ADMIN_MALFORMED_REQUEST:
+	case EFA_ADMIN_ILLEGAL_PARAMETER:
+	case EFA_ADMIN_UNKNOWN_ERROR:
+		return -EINVAL;
+	default:
+		return -EINVAL;
+	}
+}
+
+static int efa_com_wait_and_process_admin_cq_polling(struct efa_comp_ctx *comp_ctx,
+						     struct efa_com_admin_queue *aq)
+{
+	unsigned long timeout;
+	unsigned long flags;
+	int err;
+
+	timeout = jiffies + usecs_to_jiffies(aq->completion_timeout);
+
+	while (1) {
+		spin_lock_irqsave(&aq->cq.lock, flags);
+		efa_com_handle_admin_completion(aq);
+		spin_unlock_irqrestore(&aq->cq.lock, flags);
+
+		if (comp_ctx->status != EFA_CMD_SUBMITTED)
+			break;
+
+		if (time_is_before_jiffies(timeout)) {
+			ibdev_err(aq->efa_dev,
+				  "Wait for completion (polling) timeout\n");
+			/* EFA didn't have any completion */
+			atomic64_inc(&aq->stats.no_completion);
+
+			clear_bit(EFA_AQ_STATE_RUNNING_BIT, &aq->state);
+			err = -ETIME;
+			goto out;
+		}
+
+		msleep(aq->poll_interval);
+	}
+
+	if (comp_ctx->status == EFA_CMD_ABORTED) {
+		ibdev_err(aq->efa_dev, "Command was aborted\n");
+		atomic64_inc(&aq->stats.aborted_cmd);
+		err = -ENODEV;
+		goto out;
+	}
+
+	WARN_ONCE(comp_ctx->status != EFA_CMD_COMPLETED,
+		  "Invalid completion status %d\n", comp_ctx->status);
+
+	err = efa_com_comp_status_to_errno(comp_ctx->comp_status);
+out:
+	efa_com_put_comp_ctx(aq, comp_ctx);
+	return err;
+}
+
+static int efa_com_wait_and_process_admin_cq_interrupts(struct efa_comp_ctx *comp_ctx,
+							struct efa_com_admin_queue *aq)
+{
+	unsigned long flags;
+	int err;
+
+	wait_for_completion_timeout(&comp_ctx->wait_event,
+				    usecs_to_jiffies(aq->completion_timeout));
+
+	/*
+	 * In case the command wasn't completed find out the root cause.
+	 * There might be 2 kinds of errors
+	 * 1) No completion (timeout reached)
+	 * 2) There is completion but the device didn't get any msi-x interrupt.
+	 */
+	if (comp_ctx->status == EFA_CMD_SUBMITTED) {
+		spin_lock_irqsave(&aq->cq.lock, flags);
+		efa_com_handle_admin_completion(aq);
+		spin_unlock_irqrestore(&aq->cq.lock, flags);
+
+		atomic64_inc(&aq->stats.no_completion);
+
+		if (comp_ctx->status == EFA_CMD_COMPLETED)
+			ibdev_err(aq->efa_dev,
+				  "The device sent a completion but the driver didn't receive any MSI-X interrupt for admin cmd %s(%d) status %d (ctx: 0x%p, sq producer: %d, sq consumer: %d, cq consumer: %d)\n",
+				  efa_com_cmd_str(comp_ctx->cmd_opcode),
+				  comp_ctx->cmd_opcode, comp_ctx->status,
+				  comp_ctx, aq->sq.pc, aq->sq.cc, aq->cq.cc);
+		else
+			ibdev_err(aq->efa_dev,
+				  "The device didn't send any completion for admin cmd %s(%d) status %d (ctx 0x%p, sq producer: %d, sq consumer: %d, cq consumer: %d)\n",
+				  efa_com_cmd_str(comp_ctx->cmd_opcode),
+				  comp_ctx->cmd_opcode, comp_ctx->status,
+				  comp_ctx, aq->sq.pc, aq->sq.cc, aq->cq.cc);
+
+		clear_bit(EFA_AQ_STATE_RUNNING_BIT, &aq->state);
+		err = -ETIME;
+		goto out;
+	}
+
+	err = efa_com_comp_status_to_errno(comp_ctx->comp_status);
+out:
+	efa_com_put_comp_ctx(aq, comp_ctx);
+	return err;
+}
+
+/*
+ * There are two types to wait for completion.
+ * Polling mode - wait until the completion is available.
+ * Async mode - wait on wait queue until the completion is ready
+ * (or the timeout expired).
+ * It is expected that the IRQ called efa_com_handle_admin_completion
+ * to mark the completions.
+ */
+static int efa_com_wait_and_process_admin_cq(struct efa_comp_ctx *comp_ctx,
+					     struct efa_com_admin_queue *aq)
+{
+	if (test_bit(EFA_AQ_STATE_POLLING_BIT, &aq->state))
+		return efa_com_wait_and_process_admin_cq_polling(comp_ctx, aq);
+
+	return efa_com_wait_and_process_admin_cq_interrupts(comp_ctx, aq);
+}
+
+/**
+ * efa_com_cmd_exec - Execute admin command
+ * @aq: admin queue.
+ * @cmd: the admin command to execute.
+ * @cmd_size: the command size.
+ * @comp: command completion return entry.
+ * @comp_size: command completion size.
+ * Submit an admin command and then wait until the device will return a
+ * completion.
+ * The completion will be copied into comp.
+ *
+ * @return - 0 on success, negative value on failure.
+ */
+int efa_com_cmd_exec(struct efa_com_admin_queue *aq,
+		     struct efa_admin_aq_entry *cmd,
+		     size_t cmd_size,
+		     struct efa_admin_acq_entry *comp,
+		     size_t comp_size)
+{
+	struct efa_comp_ctx *comp_ctx;
+	int err;
+
+	might_sleep();
+
+	/* In case of queue FULL */
+	down(&aq->avail_cmds);
+
+	ibdev_dbg(aq->efa_dev, "%s (opcode %d)\n",
+		  efa_com_cmd_str(cmd->aq_common_descriptor.opcode),
+		  cmd->aq_common_descriptor.opcode);
+	comp_ctx = efa_com_submit_admin_cmd(aq, cmd, cmd_size, comp, comp_size);
+	if (IS_ERR(comp_ctx)) {
+		ibdev_err(aq->efa_dev,
+			  "Failed to submit command %s (opcode %u) err %ld\n",
+			  efa_com_cmd_str(cmd->aq_common_descriptor.opcode),
+			  cmd->aq_common_descriptor.opcode, PTR_ERR(comp_ctx));
+
+		up(&aq->avail_cmds);
+		return PTR_ERR(comp_ctx);
+	}
+
+	err = efa_com_wait_and_process_admin_cq(comp_ctx, aq);
+	if (err)
+		ibdev_err(aq->efa_dev,
+			  "Failed to process command %s (opcode %u) comp_status %d err %d\n",
+			  efa_com_cmd_str(cmd->aq_common_descriptor.opcode),
+			  cmd->aq_common_descriptor.opcode,
+			  comp_ctx->comp_status, err);
+
+	up(&aq->avail_cmds);
+
+	return err;
+}
+
+/**
+ * efa_com_abort_admin_commands - Abort all the outstanding admin commands.
+ * @edev: EFA communication layer struct
+ *
+ * This method aborts all the outstanding admin commands.
+ * The caller should then call efa_com_wait_for_abort_completion to make sure
+ * all the commands were completed.
+ */
+static void efa_com_abort_admin_commands(struct efa_com_dev *edev)
+{
+	struct efa_com_admin_queue *aq = &edev->aq;
+	struct efa_comp_ctx *comp_ctx;
+	unsigned long flags;
+	u16 i;
+
+	spin_lock(&aq->sq.lock);
+	spin_lock_irqsave(&aq->cq.lock, flags);
+	for (i = 0; i < aq->depth; i++) {
+		comp_ctx = efa_com_get_comp_ctx(aq, i, false);
+		if (!comp_ctx)
+			break;
+
+		comp_ctx->status = EFA_CMD_ABORTED;
+
+		complete(&comp_ctx->wait_event);
+	}
+	spin_unlock_irqrestore(&aq->cq.lock, flags);
+	spin_unlock(&aq->sq.lock);
+}
+
+/**
+ * efa_com_wait_for_abort_completion - Wait for admin commands abort.
+ * @edev: EFA communication layer struct
+ *
+ * This method wait until all the outstanding admin commands will be completed.
+ */
+static void efa_com_wait_for_abort_completion(struct efa_com_dev *edev)
+{
+	struct efa_com_admin_queue *aq = &edev->aq;
+	int i;
+
+	/* all mine */
+	for (i = 0; i < aq->depth; i++)
+		down(&aq->avail_cmds);
+
+	/* let it go */
+	for (i = 0; i < aq->depth; i++)
+		up(&aq->avail_cmds);
+}
+
+static void efa_com_admin_flush(struct efa_com_dev *edev)
+{
+	struct efa_com_admin_queue *aq = &edev->aq;
+
+	clear_bit(EFA_AQ_STATE_RUNNING_BIT, &aq->state);
+
+	efa_com_abort_admin_commands(edev);
+	efa_com_wait_for_abort_completion(edev);
+}
+
+/**
+ * efa_com_admin_destroy - Destroy the admin and the async events queues.
+ * @edev: EFA communication layer struct
+ */
+void efa_com_admin_destroy(struct efa_com_dev *edev)
+{
+	struct efa_com_admin_queue *aq = &edev->aq;
+	struct efa_com_aenq *aenq = &edev->aenq;
+	struct efa_com_admin_cq *cq = &aq->cq;
+	struct efa_com_admin_sq *sq = &aq->sq;
+	u16 size;
+
+	efa_com_admin_flush(edev);
+
+	devm_kfree(edev->dmadev, aq->comp_ctx_pool);
+	devm_kfree(edev->dmadev, aq->comp_ctx);
+
+	size = aq->depth * sizeof(*sq->entries);
+	dma_free_coherent(edev->dmadev, size, sq->entries, sq->dma_addr);
+
+	size = aq->depth * sizeof(*cq->entries);
+	dma_free_coherent(edev->dmadev, size, cq->entries, cq->dma_addr);
+
+	size = aenq->depth * sizeof(*aenq->entries);
+	dma_free_coherent(edev->dmadev, size, aenq->entries, aenq->dma_addr);
+}
+
+/**
+ * efa_com_set_admin_polling_mode - Set the admin completion queue polling mode
+ * @edev: EFA communication layer struct
+ * @polling: Enable/Disable polling mode
+ *
+ * Set the admin completion mode.
+ */
+void efa_com_set_admin_polling_mode(struct efa_com_dev *edev, bool polling)
+{
+	u32 mask_value = 0;
+
+	if (polling)
+		mask_value = EFA_REGS_ADMIN_INTR_MASK;
+
+	writel(mask_value, edev->reg_bar + EFA_REGS_INTR_MASK_OFF);
+	if (polling)
+		set_bit(EFA_AQ_STATE_POLLING_BIT, &edev->aq.state);
+	else
+		clear_bit(EFA_AQ_STATE_POLLING_BIT, &edev->aq.state);
+}
+
+static void efa_com_stats_init(struct efa_com_dev *edev)
+{
+	atomic64_t *s = (atomic64_t *)&edev->aq.stats;
+	int i;
+
+	for (i = 0; i < sizeof(edev->aq.stats) / sizeof(*s); i++, s++)
+		atomic64_set(s, 0);
+}
+
+/**
+ * efa_com_admin_init - Init the admin and the async queues
+ * @edev: EFA communication layer struct
+ * @aenq_handlers: Those handlers to be called upon event.
+ *
+ * Initialize the admin submission and completion queues.
+ * Initialize the asynchronous events notification queues.
+ *
+ * @return - 0 on success, negative value on failure.
+ */
+int efa_com_admin_init(struct efa_com_dev *edev,
+		       struct efa_aenq_handlers *aenq_handlers)
+{
+	struct efa_com_admin_queue *aq = &edev->aq;
+	u32 timeout;
+	u32 dev_sts;
+	u32 cap;
+	int err;
+
+	dev_sts = efa_com_reg_read32(edev, EFA_REGS_DEV_STS_OFF);
+	if (!(dev_sts & EFA_REGS_DEV_STS_READY_MASK)) {
+		ibdev_err(edev->efa_dev,
+			  "Device isn't ready, abort com init %#x\n", dev_sts);
+		return -ENODEV;
+	}
+
+	aq->depth = EFA_ADMIN_QUEUE_DEPTH;
+
+	aq->dmadev = edev->dmadev;
+	aq->efa_dev = edev->efa_dev;
+	set_bit(EFA_AQ_STATE_POLLING_BIT, &aq->state);
+
+	sema_init(&aq->avail_cmds, aq->depth);
+
+	efa_com_stats_init(edev);
+
+	err = efa_com_init_comp_ctxt(aq);
+	if (err)
+		return err;
+
+	err = efa_com_admin_init_sq(edev);
+	if (err)
+		goto err_destroy_comp_ctxt;
+
+	err = efa_com_admin_init_cq(edev);
+	if (err)
+		goto err_destroy_sq;
+
+	efa_com_set_admin_polling_mode(edev, false);
+
+	err = efa_com_admin_init_aenq(edev, aenq_handlers);
+	if (err)
+		goto err_destroy_cq;
+
+	cap = efa_com_reg_read32(edev, EFA_REGS_CAPS_OFF);
+	timeout = (cap & EFA_REGS_CAPS_ADMIN_CMD_TO_MASK) >>
+		  EFA_REGS_CAPS_ADMIN_CMD_TO_SHIFT;
+	if (timeout)
+		/* the resolution of timeout reg is 100ms */
+		aq->completion_timeout = timeout * 100000;
+	else
+		aq->completion_timeout = ADMIN_CMD_TIMEOUT_US;
+
+	aq->poll_interval = EFA_POLL_INTERVAL_MS;
+
+	set_bit(EFA_AQ_STATE_RUNNING_BIT, &aq->state);
+
+	return 0;
+
+err_destroy_cq:
+	dma_free_coherent(edev->dmadev, aq->depth * sizeof(*aq->cq.entries),
+			  aq->cq.entries, aq->cq.dma_addr);
+err_destroy_sq:
+	dma_free_coherent(edev->dmadev, aq->depth * sizeof(*aq->sq.entries),
+			  aq->sq.entries, aq->sq.dma_addr);
+err_destroy_comp_ctxt:
+	devm_kfree(edev->dmadev, aq->comp_ctx);
+
+	return err;
+}
+
+/**
+ * efa_com_admin_q_comp_intr_handler - admin queue interrupt handler
+ * @edev: EFA communication layer struct
+ *
+ * This method goes over the admin completion queue and wakes up
+ * all the pending threads that wait on the commands wait event.
+ *
+ * @note: Should be called after MSI-X interrupt.
+ */
+void efa_com_admin_q_comp_intr_handler(struct efa_com_dev *edev)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&edev->aq.cq.lock, flags);
+	efa_com_handle_admin_completion(&edev->aq);
+	spin_unlock_irqrestore(&edev->aq.cq.lock, flags);
+}
+
+/*
+ * efa_handle_specific_aenq_event:
+ * return the handler that is relevant to the specific event group
+ */
+static efa_aenq_handler efa_com_get_specific_aenq_cb(struct efa_com_dev *edev,
+						     u16 group)
+{
+	struct efa_aenq_handlers *aenq_handlers = edev->aenq.aenq_handlers;
+
+	if (group < EFA_MAX_HANDLERS && aenq_handlers->handlers[group])
+		return aenq_handlers->handlers[group];
+
+	return aenq_handlers->unimplemented_handler;
+}
+
+/**
+ * efa_com_aenq_intr_handler - AENQ interrupt handler
+ * @edev: EFA communication layer struct
+ * @data: Data of interrupt handler.
+ *
+ * Go over the async event notification queue and call the proper aenq handler.
+ */
+void efa_com_aenq_intr_handler(struct efa_com_dev *edev, void *data)
+{
+	struct efa_admin_aenq_common_desc *aenq_common;
+	struct efa_com_aenq *aenq = &edev->aenq;
+	struct efa_admin_aenq_entry *aenq_e;
+	efa_aenq_handler handler_cb;
+	u32 processed = 0;
+	u8 phase;
+	u32 ci;
+
+	ci = aenq->cc & (aenq->depth - 1);
+	phase = aenq->phase;
+	aenq_e = &aenq->entries[ci]; /* Get first entry */
+	aenq_common = &aenq_e->aenq_common_desc;
+
+	/* Go over all the events */
+	while ((READ_ONCE(aenq_common->flags) &
+		EFA_ADMIN_AENQ_COMMON_DESC_PHASE_MASK) == phase) {
+		/*
+		 * Do not read the rest of the completion entry before the
+		 * phase bit was validated
+		 */
+		dma_rmb();
+
+		/* Handle specific event*/
+		handler_cb = efa_com_get_specific_aenq_cb(edev,
+							  aenq_common->group);
+		handler_cb(data, aenq_e); /* call the actual event handler*/
+
+		/* Get next event entry */
+		ci++;
+		processed++;
+
+		if (ci == aenq->depth) {
+			ci = 0;
+			phase = !phase;
+		}
+		aenq_e = &aenq->entries[ci];
+		aenq_common = &aenq_e->aenq_common_desc;
+	}
+
+	aenq->cc += processed;
+	aenq->phase = phase;
+
+	/* Don't update aenq doorbell if there weren't any processed events */
+	if (!processed)
+		return;
+
+	/* barrier not needed in case of writel */
+	writel(aenq->cc, edev->reg_bar + EFA_REGS_AENQ_CONS_DB_OFF);
+}
+
+static void efa_com_mmio_reg_read_resp_addr_init(struct efa_com_dev *edev)
+{
+	struct efa_com_mmio_read *mmio_read = &edev->mmio_read;
+	u32 addr_high;
+	u32 addr_low;
+
+	/* dma_addr_bits is unknown at this point */
+	addr_high = (mmio_read->read_resp_dma_addr >> 32) & GENMASK(31, 0);
+	addr_low = mmio_read->read_resp_dma_addr & GENMASK(31, 0);
+
+	writel(addr_high, edev->reg_bar + EFA_REGS_MMIO_RESP_HI_OFF);
+	writel(addr_low, edev->reg_bar + EFA_REGS_MMIO_RESP_LO_OFF);
+}
+
+int efa_com_mmio_reg_read_init(struct efa_com_dev *edev)
+{
+	struct efa_com_mmio_read *mmio_read = &edev->mmio_read;
+
+	spin_lock_init(&mmio_read->lock);
+	mmio_read->read_resp =
+		dma_alloc_coherent(edev->dmadev, sizeof(*mmio_read->read_resp),
+				   &mmio_read->read_resp_dma_addr, GFP_KERNEL);
+	if (!mmio_read->read_resp)
+		return -ENOMEM;
+
+	efa_com_mmio_reg_read_resp_addr_init(edev);
+
+	mmio_read->read_resp->req_id = 0;
+	mmio_read->seq_num = 0;
+	mmio_read->mmio_read_timeout = EFA_REG_READ_TIMEOUT_US;
+
+	return 0;
+}
+
+void efa_com_mmio_reg_read_destroy(struct efa_com_dev *edev)
+{
+	struct efa_com_mmio_read *mmio_read = &edev->mmio_read;
+
+	dma_free_coherent(edev->dmadev, sizeof(*mmio_read->read_resp),
+			  mmio_read->read_resp, mmio_read->read_resp_dma_addr);
+}
+
+int efa_com_validate_version(struct efa_com_dev *edev)
+{
+	u32 ctrl_ver_masked;
+	u32 ctrl_ver;
+	u32 ver;
+
+	/*
+	 * Make sure the EFA version and the controller version are at least
+	 * as the driver expects
+	 */
+	ver = efa_com_reg_read32(edev, EFA_REGS_VERSION_OFF);
+	ctrl_ver = efa_com_reg_read32(edev,
+				      EFA_REGS_CONTROLLER_VERSION_OFF);
+
+	ibdev_dbg(edev->efa_dev, "efa device version: %d.%d\n",
+		  (ver & EFA_REGS_VERSION_MAJOR_VERSION_MASK) >>
+			  EFA_REGS_VERSION_MAJOR_VERSION_SHIFT,
+		  ver & EFA_REGS_VERSION_MINOR_VERSION_MASK);
+
+	if (ver < MIN_EFA_VER) {
+		ibdev_err(edev->efa_dev,
+			  "EFA version is lower than the minimal version the driver supports\n");
+		return -EOPNOTSUPP;
+	}
+
+	ibdev_dbg(edev->efa_dev,
+		  "efa controller version: %d.%d.%d implementation version %d\n",
+		  (ctrl_ver & EFA_REGS_CONTROLLER_VERSION_MAJOR_VERSION_MASK) >>
+			  EFA_REGS_CONTROLLER_VERSION_MAJOR_VERSION_SHIFT,
+		  (ctrl_ver & EFA_REGS_CONTROLLER_VERSION_MINOR_VERSION_MASK) >>
+			  EFA_REGS_CONTROLLER_VERSION_MINOR_VERSION_SHIFT,
+		  (ctrl_ver & EFA_REGS_CONTROLLER_VERSION_SUBMINOR_VERSION_MASK),
+		  (ctrl_ver & EFA_REGS_CONTROLLER_VERSION_IMPL_ID_MASK) >>
+			  EFA_REGS_CONTROLLER_VERSION_IMPL_ID_SHIFT);
+
+	ctrl_ver_masked =
+		(ctrl_ver & EFA_REGS_CONTROLLER_VERSION_MAJOR_VERSION_MASK) |
+		(ctrl_ver & EFA_REGS_CONTROLLER_VERSION_MINOR_VERSION_MASK) |
+		(ctrl_ver & EFA_REGS_CONTROLLER_VERSION_SUBMINOR_VERSION_MASK);
+
+	/* Validate the ctrl version without the implementation ID */
+	if (ctrl_ver_masked < MIN_EFA_CTRL_VER) {
+		ibdev_err(edev->efa_dev,
+			  "EFA ctrl version is lower than the minimal ctrl version the driver supports\n");
+		return -EOPNOTSUPP;
+	}
+
+	return 0;
+}
+
+/**
+ * efa_com_get_dma_width - Retrieve physical dma address width the device
+ * supports.
+ * @edev: EFA communication layer struct
+ *
+ * Retrieve the maximum physical address bits the device can handle.
+ *
+ * @return: > 0 on Success and negative value otherwise.
+ */
+int efa_com_get_dma_width(struct efa_com_dev *edev)
+{
+	u32 caps = efa_com_reg_read32(edev, EFA_REGS_CAPS_OFF);
+	int width;
+
+	width = (caps & EFA_REGS_CAPS_DMA_ADDR_WIDTH_MASK) >>
+		EFA_REGS_CAPS_DMA_ADDR_WIDTH_SHIFT;
+
+	ibdev_dbg(edev->efa_dev, "DMA width: %d\n", width);
+
+	if (width < 32 || width > 64) {
+		ibdev_err(edev->efa_dev, "DMA width illegal value: %d\n", width);
+		return -EINVAL;
+	}
+
+	edev->dma_addr_bits = width;
+
+	return width;
+}
+
+static int wait_for_reset_state(struct efa_com_dev *edev, u32 timeout,
+				u16 exp_state)
+{
+	u32 val, i;
+
+	for (i = 0; i < timeout; i++) {
+		val = efa_com_reg_read32(edev, EFA_REGS_DEV_STS_OFF);
+
+		if ((val & EFA_REGS_DEV_STS_RESET_IN_PROGRESS_MASK) ==
+		    exp_state)
+			return 0;
+
+		ibdev_dbg(edev->efa_dev, "Reset indication val %d\n", val);
+		msleep(EFA_POLL_INTERVAL_MS);
+	}
+
+	return -ETIME;
+}
+
+/**
+ * efa_com_dev_reset - Perform device FLR to the device.
+ * @edev: EFA communication layer struct
+ * @reset_reason: Specify what is the trigger for the reset in case of an error.
+ *
+ * @return - 0 on success, negative value on failure.
+ */
+int efa_com_dev_reset(struct efa_com_dev *edev,
+		      enum efa_regs_reset_reason_types reset_reason)
+{
+	u32 stat, timeout, cap, reset_val;
+	int err;
+
+	stat = efa_com_reg_read32(edev, EFA_REGS_DEV_STS_OFF);
+	cap = efa_com_reg_read32(edev, EFA_REGS_CAPS_OFF);
+
+	if (!(stat & EFA_REGS_DEV_STS_READY_MASK)) {
+		ibdev_err(edev->efa_dev,
+			  "Device isn't ready, can't reset device\n");
+		return -EINVAL;
+	}
+
+	timeout = (cap & EFA_REGS_CAPS_RESET_TIMEOUT_MASK) >>
+		  EFA_REGS_CAPS_RESET_TIMEOUT_SHIFT;
+	if (!timeout) {
+		ibdev_err(edev->efa_dev, "Invalid timeout value\n");
+		return -EINVAL;
+	}
+
+	/* start reset */
+	reset_val = EFA_REGS_DEV_CTL_DEV_RESET_MASK;
+	reset_val |= (reset_reason << EFA_REGS_DEV_CTL_RESET_REASON_SHIFT) &
+		     EFA_REGS_DEV_CTL_RESET_REASON_MASK;
+	writel(reset_val, edev->reg_bar + EFA_REGS_DEV_CTL_OFF);
+
+	/* reset clears the mmio readless address, restore it */
+	efa_com_mmio_reg_read_resp_addr_init(edev);
+
+	err = wait_for_reset_state(edev, timeout,
+				   EFA_REGS_DEV_STS_RESET_IN_PROGRESS_MASK);
+	if (err) {
+		ibdev_err(edev->efa_dev, "Reset indication didn't turn on\n");
+		return err;
+	}
+
+	/* reset done */
+	writel(0, edev->reg_bar + EFA_REGS_DEV_CTL_OFF);
+	err = wait_for_reset_state(edev, timeout, 0);
+	if (err) {
+		ibdev_err(edev->efa_dev, "Reset indication didn't turn off\n");
+		return err;
+	}
+
+	timeout = (cap & EFA_REGS_CAPS_ADMIN_CMD_TO_MASK) >>
+		  EFA_REGS_CAPS_ADMIN_CMD_TO_SHIFT;
+	if (timeout)
+		/* the resolution of timeout reg is 100ms */
+		edev->aq.completion_timeout = timeout * 100000;
+	else
+		edev->aq.completion_timeout = ADMIN_CMD_TIMEOUT_US;
+
+	return 0;
+}