qed: Add module with basic common support

The Qlogic Everest Driver is the backend module for the QL4xxx ethernet
products by Qlogic.

This module serves two main purposes:
 1. It's responsible to contain all the common code that will be shared
    between the various drivers that would be used with said line of
    products. Flows such as chip initialization and de-initialization
    fall under this category.

 2. It would abstract the protocol-specific HW & FW components, allowing
    the protocol drivers to have a clean APIs which is detached in its
    slowpath configuration from the actual HSI.

This adds a very basic module without any protocol-specific bits.
I.e., this adds a basic implementation that almost entirely falls under
the first category.

Signed-off-by: Yuval Mintz <Yuval.Mintz@qlogic.com>
Signed-off-by: Ariel Elior <Ariel.Elior@qlogic.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 831 insertions, 0 deletions

diff --git a/drivers/net/ethernet/qlogic/qed/qed_spq.c b/drivers/net/ethernet/qlogic/qed/qed_spq.c
new file mode 100644
index 000000000000..f28ecb197309
--- /dev/null
+++ b/drivers/net/ethernet/qlogic/qed/qed_spq.c
@@ -0,0 +1,831 @@
+/* QLogic qed NIC Driver
+ * Copyright (c) 2015 QLogic Corporation
+ *
+ * This software is available under the terms of the GNU General Public License
+ * (GPL) Version 2, available from the file COPYING in the main directory of
+ * this source tree.
+ */
+
+#include <linux/types.h>
+#include <asm/byteorder.h>
+#include <linux/io.h>
+#include <linux/delay.h>
+#include <linux/dma-mapping.h>
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/list.h>
+#include <linux/pci.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/string.h>
+#include "qed.h"
+#include "qed_cxt.h"
+#include "qed_dev_api.h"
+#include "qed_hsi.h"
+#include "qed_hw.h"
+#include "qed_int.h"
+#include "qed_mcp.h"
+#include "qed_reg_addr.h"
+#include "qed_sp.h"
+
+/***************************************************************************
+* Structures & Definitions
+***************************************************************************/
+
+#define SPQ_HIGH_PRI_RESERVE_DEFAULT    (1)
+#define SPQ_BLOCK_SLEEP_LENGTH          (1000)
+
+/***************************************************************************
+* Blocking Imp. (BLOCK/EBLOCK mode)
+***************************************************************************/
+static void qed_spq_blocking_cb(struct qed_hwfn *p_hwfn,
+				void *cookie,
+				union event_ring_data *data,
+				u8 fw_return_code)
+{
+	struct qed_spq_comp_done *comp_done;
+
+	comp_done = (struct qed_spq_comp_done *)cookie;
+
+	comp_done->done			= 0x1;
+	comp_done->fw_return_code	= fw_return_code;
+
+	/* make update visible to waiting thread */
+	smp_wmb();
+}
+
+static int qed_spq_block(struct qed_hwfn *p_hwfn,
+			 struct qed_spq_entry *p_ent,
+			 u8 *p_fw_ret)
+{
+	int sleep_count = SPQ_BLOCK_SLEEP_LENGTH;
+	struct qed_spq_comp_done *comp_done;
+	int rc;
+
+	comp_done = (struct qed_spq_comp_done *)p_ent->comp_cb.cookie;
+	while (sleep_count) {
+		/* validate we receive completion update */
+		smp_rmb();
+		if (comp_done->done == 1) {
+			if (p_fw_ret)
+				*p_fw_ret = comp_done->fw_return_code;
+			return 0;
+		}
+		usleep_range(5000, 10000);
+		sleep_count--;
+	}
+
+	DP_INFO(p_hwfn, "Ramrod is stuck, requesting MCP drain\n");
+	rc = qed_mcp_drain(p_hwfn, p_hwfn->p_main_ptt);
+	if (rc != 0)
+		DP_NOTICE(p_hwfn, "MCP drain failed\n");
+
+	/* Retry after drain */
+	sleep_count = SPQ_BLOCK_SLEEP_LENGTH;
+	while (sleep_count) {
+		/* validate we receive completion update */
+		smp_rmb();
+		if (comp_done->done == 1) {
+			if (p_fw_ret)
+				*p_fw_ret = comp_done->fw_return_code;
+			return 0;
+		}
+		usleep_range(5000, 10000);
+		sleep_count--;
+	}
+
+	if (comp_done->done == 1) {
+		if (p_fw_ret)
+			*p_fw_ret = comp_done->fw_return_code;
+		return 0;
+	}
+
+	DP_NOTICE(p_hwfn, "Ramrod is stuck, MCP drain failed\n");
+
+	return -EBUSY;
+}
+
+/***************************************************************************
+* SPQ entries inner API
+***************************************************************************/
+static int
+qed_spq_fill_entry(struct qed_hwfn *p_hwfn,
+		   struct qed_spq_entry *p_ent)
+{
+	p_ent->elem.hdr.echo = 0;
+	p_hwfn->p_spq->echo_idx++;
+	p_ent->flags = 0;
+
+	switch (p_ent->comp_mode) {
+	case QED_SPQ_MODE_EBLOCK:
+	case QED_SPQ_MODE_BLOCK:
+		p_ent->comp_cb.function = qed_spq_blocking_cb;
+		break;
+	case QED_SPQ_MODE_CB:
+		break;
+	default:
+		DP_NOTICE(p_hwfn, "Unknown SPQE completion mode %d\n",
+			  p_ent->comp_mode);
+		return -EINVAL;
+	}
+
+	DP_VERBOSE(p_hwfn, QED_MSG_SPQ,
+		   "Ramrod header: [CID 0x%08x CMD 0x%02x protocol 0x%02x] Data pointer: [%08x:%08x] Completion Mode: %s\n",
+		   p_ent->elem.hdr.cid,
+		   p_ent->elem.hdr.cmd_id,
+		   p_ent->elem.hdr.protocol_id,
+		   p_ent->elem.data_ptr.hi,
+		   p_ent->elem.data_ptr.lo,
+		   D_TRINE(p_ent->comp_mode, QED_SPQ_MODE_EBLOCK,
+			   QED_SPQ_MODE_BLOCK, "MODE_EBLOCK", "MODE_BLOCK",
+			   "MODE_CB"));
+
+	return 0;
+}
+
+/***************************************************************************
+* HSI access
+***************************************************************************/
+static void qed_spq_hw_initialize(struct qed_hwfn *p_hwfn,
+				  struct qed_spq *p_spq)
+{
+	u16				pq;
+	struct qed_cxt_info		cxt_info;
+	struct core_conn_context	*p_cxt;
+	union qed_qm_pq_params		pq_params;
+	int				rc;
+
+	cxt_info.iid = p_spq->cid;
+
+	rc = qed_cxt_get_cid_info(p_hwfn, &cxt_info);
+
+	if (rc < 0) {
+		DP_NOTICE(p_hwfn, "Cannot find context info for cid=%d\n",
+			  p_spq->cid);
+		return;
+	}
+
+	p_cxt = cxt_info.p_cxt;
+
+	SET_FIELD(p_cxt->xstorm_ag_context.flags10,
+		  XSTORM_CORE_CONN_AG_CTX_DQ_CF_EN, 1);
+	SET_FIELD(p_cxt->xstorm_ag_context.flags1,
+		  XSTORM_CORE_CONN_AG_CTX_DQ_CF_ACTIVE, 1);
+	SET_FIELD(p_cxt->xstorm_ag_context.flags9,
+		  XSTORM_CORE_CONN_AG_CTX_CONSOLID_PROD_CF_EN, 1);
+
+	/* QM physical queue */
+	memset(&pq_params, 0, sizeof(pq_params));
+	pq_params.core.tc = LB_TC;
+	pq = qed_get_qm_pq(p_hwfn, PROTOCOLID_CORE, &pq_params);
+	p_cxt->xstorm_ag_context.physical_q0 = cpu_to_le16(pq);
+
+	p_cxt->xstorm_st_context.spq_base_lo =
+		DMA_LO_LE(p_spq->chain.p_phys_addr);
+	p_cxt->xstorm_st_context.spq_base_hi =
+		DMA_HI_LE(p_spq->chain.p_phys_addr);
+
+	p_cxt->xstorm_st_context.consolid_base_addr.lo =
+		DMA_LO_LE(p_hwfn->p_consq->chain.p_phys_addr);
+	p_cxt->xstorm_st_context.consolid_base_addr.hi =
+		DMA_HI_LE(p_hwfn->p_consq->chain.p_phys_addr);
+}
+
+static int qed_spq_hw_post(struct qed_hwfn *p_hwfn,
+			   struct qed_spq *p_spq,
+			   struct qed_spq_entry *p_ent)
+{
+	struct qed_chain		*p_chain = &p_hwfn->p_spq->chain;
+	struct slow_path_element	*elem;
+	struct core_db_data		db;
+
+	elem = qed_chain_produce(p_chain);
+	if (!elem) {
+		DP_NOTICE(p_hwfn, "Failed to produce from SPQ chain\n");
+		return -EINVAL;
+	}
+
+	*elem = p_ent->elem; /* struct assignment */
+
+	/* send a doorbell on the slow hwfn session */
+	memset(&db, 0, sizeof(db));
+	SET_FIELD(db.params, CORE_DB_DATA_DEST, DB_DEST_XCM);
+	SET_FIELD(db.params, CORE_DB_DATA_AGG_CMD, DB_AGG_CMD_SET);
+	SET_FIELD(db.params, CORE_DB_DATA_AGG_VAL_SEL,
+		  DQ_XCM_CORE_SPQ_PROD_CMD);
+	db.agg_flags = DQ_XCM_CORE_DQ_CF_CMD;
+
+	/* validate producer is up to-date */
+	rmb();
+
+	db.spq_prod = cpu_to_le16(qed_chain_get_prod_idx(p_chain));
+
+	/* do not reorder */
+	barrier();
+
+	DOORBELL(p_hwfn, qed_db_addr(p_spq->cid, DQ_DEMS_LEGACY), *(u32 *)&db);
+
+	/* make sure doorbell is rang */
+	mmiowb();
+
+	DP_VERBOSE(p_hwfn, QED_MSG_SPQ,
+		   "Doorbelled [0x%08x, CID 0x%08x] with Flags: %02x agg_params: %02x, prod: %04x\n",
+		   qed_db_addr(p_spq->cid, DQ_DEMS_LEGACY),
+		   p_spq->cid, db.params, db.agg_flags,
+		   qed_chain_get_prod_idx(p_chain));
+
+	return 0;
+}
+
+/***************************************************************************
+* Asynchronous events
+***************************************************************************/
+static int
+qed_async_event_completion(struct qed_hwfn *p_hwfn,
+			   struct event_ring_entry *p_eqe)
+{
+	DP_NOTICE(p_hwfn,
+		  "Unknown Async completion for protocol: %d\n",
+		   p_eqe->protocol_id);
+	return -EINVAL;
+}
+
+/***************************************************************************
+* EQ API
+***************************************************************************/
+void qed_eq_prod_update(struct qed_hwfn *p_hwfn,
+			u16 prod)
+{
+	u32 addr = GTT_BAR0_MAP_REG_USDM_RAM +
+		   USTORM_EQE_CONS_OFFSET(p_hwfn->rel_pf_id);
+
+	REG_WR16(p_hwfn, addr, prod);
+
+	/* keep prod updates ordered */
+	mmiowb();
+}
+
+int qed_eq_completion(struct qed_hwfn *p_hwfn,
+		      void *cookie)
+
+{
+	struct qed_eq *p_eq = cookie;
+	struct qed_chain *p_chain = &p_eq->chain;
+	int rc = 0;
+
+	/* take a snapshot of the FW consumer */
+	u16 fw_cons_idx = le16_to_cpu(*p_eq->p_fw_cons);
+
+	DP_VERBOSE(p_hwfn, QED_MSG_SPQ, "fw_cons_idx %x\n", fw_cons_idx);
+
+	/* Need to guarantee the fw_cons index we use points to a usuable
+	 * element (to comply with our chain), so our macros would comply
+	 */
+	if ((fw_cons_idx & qed_chain_get_usable_per_page(p_chain)) ==
+	    qed_chain_get_usable_per_page(p_chain))
+		fw_cons_idx += qed_chain_get_unusable_per_page(p_chain);
+
+	/* Complete current segment of eq entries */
+	while (fw_cons_idx != qed_chain_get_cons_idx(p_chain)) {
+		struct event_ring_entry *p_eqe = qed_chain_consume(p_chain);
+
+		if (!p_eqe) {
+			rc = -EINVAL;
+			break;
+		}
+
+		DP_VERBOSE(p_hwfn, QED_MSG_SPQ,
+			   "op %x prot %x res0 %x echo %x fwret %x flags %x\n",
+			   p_eqe->opcode,
+			   p_eqe->protocol_id,
+			   p_eqe->reserved0,
+			   le16_to_cpu(p_eqe->echo),
+			   p_eqe->fw_return_code,
+			   p_eqe->flags);
+
+		if (GET_FIELD(p_eqe->flags, EVENT_RING_ENTRY_ASYNC)) {
+			if (qed_async_event_completion(p_hwfn, p_eqe))
+				rc = -EINVAL;
+		} else if (qed_spq_completion(p_hwfn,
+					      p_eqe->echo,
+					      p_eqe->fw_return_code,
+					      &p_eqe->data)) {
+			rc = -EINVAL;
+		}
+
+		qed_chain_recycle_consumed(p_chain);
+	}
+
+	qed_eq_prod_update(p_hwfn, qed_chain_get_prod_idx(p_chain));
+
+	return rc;
+}
+
+struct qed_eq *qed_eq_alloc(struct qed_hwfn *p_hwfn,
+			    u16 num_elem)
+{
+	struct qed_eq *p_eq;
+
+	/* Allocate EQ struct */
+	p_eq = kzalloc(sizeof(*p_eq), GFP_ATOMIC);
+	if (!p_eq) {
+		DP_NOTICE(p_hwfn, "Failed to allocate `struct qed_eq'\n");
+		return NULL;
+	}
+
+	/* Allocate and initialize EQ chain*/
+	if (qed_chain_alloc(p_hwfn->cdev,
+			    QED_CHAIN_USE_TO_PRODUCE,
+			    QED_CHAIN_MODE_PBL,
+			    num_elem,
+			    sizeof(union event_ring_element),
+			    &p_eq->chain)) {
+		DP_NOTICE(p_hwfn, "Failed to allocate eq chain\n");
+		goto eq_allocate_fail;
+	}
+
+	/* register EQ completion on the SP SB */
+	qed_int_register_cb(p_hwfn,
+			    qed_eq_completion,
+			    p_eq,
+			    &p_eq->eq_sb_index,
+			    &p_eq->p_fw_cons);
+
+	return p_eq;
+
+eq_allocate_fail:
+	qed_eq_free(p_hwfn, p_eq);
+	return NULL;
+}
+
+void qed_eq_setup(struct qed_hwfn *p_hwfn,
+		  struct qed_eq *p_eq)
+{
+	qed_chain_reset(&p_eq->chain);
+}
+
+void qed_eq_free(struct qed_hwfn *p_hwfn,
+		 struct qed_eq *p_eq)
+{
+	if (!p_eq)
+		return;
+	qed_chain_free(p_hwfn->cdev, &p_eq->chain);
+	kfree(p_eq);
+}
+
+/***************************************************************************
+* Slow hwfn Queue (spq)
+***************************************************************************/
+void qed_spq_setup(struct qed_hwfn *p_hwfn)
+{
+	struct qed_spq		*p_spq	= p_hwfn->p_spq;
+	struct qed_spq_entry	*p_virt = NULL;
+	dma_addr_t		p_phys	= 0;
+	unsigned int		i	= 0;
+
+	INIT_LIST_HEAD(&p_spq->pending);
+	INIT_LIST_HEAD(&p_spq->completion_pending);
+	INIT_LIST_HEAD(&p_spq->free_pool);
+	INIT_LIST_HEAD(&p_spq->unlimited_pending);
+	spin_lock_init(&p_spq->lock);
+
+	/* SPQ empty pool */
+	p_phys	= p_spq->p_phys + offsetof(struct qed_spq_entry, ramrod);
+	p_virt	= p_spq->p_virt;
+
+	for (i = 0; i < p_spq->chain.capacity; i++) {
+		p_virt->elem.data_ptr.hi = DMA_HI_LE(p_phys);
+		p_virt->elem.data_ptr.lo = DMA_LO_LE(p_phys);
+
+		list_add_tail(&p_virt->list, &p_spq->free_pool);
+
+		p_virt++;
+		p_phys += sizeof(struct qed_spq_entry);
+	}
+
+	/* Statistics */
+	p_spq->normal_count		= 0;
+	p_spq->comp_count		= 0;
+	p_spq->comp_sent_count		= 0;
+	p_spq->unlimited_pending_count	= 0;
+	p_spq->echo_idx			= 0;
+
+	/* SPQ cid, cannot fail */
+	qed_cxt_acquire_cid(p_hwfn, PROTOCOLID_CORE, &p_spq->cid);
+	qed_spq_hw_initialize(p_hwfn, p_spq);
+
+	/* reset the chain itself */
+	qed_chain_reset(&p_spq->chain);
+}
+
+int qed_spq_alloc(struct qed_hwfn *p_hwfn)
+{
+	struct qed_spq		*p_spq	= NULL;
+	dma_addr_t		p_phys	= 0;
+	struct qed_spq_entry	*p_virt = NULL;
+
+	/* SPQ struct */
+	p_spq =
+		kzalloc(sizeof(struct qed_spq), GFP_ATOMIC);
+	if (!p_spq) {
+		DP_NOTICE(p_hwfn, "Failed to allocate `struct qed_spq'\n");
+		return -ENOMEM;
+	}
+
+	/* SPQ ring  */
+	if (qed_chain_alloc(p_hwfn->cdev,
+			    QED_CHAIN_USE_TO_PRODUCE,
+			    QED_CHAIN_MODE_SINGLE,
+			    0,   /* N/A when the mode is SINGLE */
+			    sizeof(struct slow_path_element),
+			    &p_spq->chain)) {
+		DP_NOTICE(p_hwfn, "Failed to allocate spq chain\n");
+		goto spq_allocate_fail;
+	}
+
+	/* allocate and fill the SPQ elements (incl. ramrod data list) */
+	p_virt = dma_alloc_coherent(&p_hwfn->cdev->pdev->dev,
+				    p_spq->chain.capacity *
+				    sizeof(struct qed_spq_entry),
+				    &p_phys,
+				    GFP_KERNEL);
+
+	if (!p_virt)
+		goto spq_allocate_fail;
+
+	p_spq->p_virt = p_virt;
+	p_spq->p_phys = p_phys;
+	p_hwfn->p_spq = p_spq;
+
+	return 0;
+
+spq_allocate_fail:
+	qed_chain_free(p_hwfn->cdev, &p_spq->chain);
+	kfree(p_spq);
+	return -ENOMEM;
+}
+
+void qed_spq_free(struct qed_hwfn *p_hwfn)
+{
+	struct qed_spq *p_spq = p_hwfn->p_spq;
+
+	if (!p_spq)
+		return;
+
+	if (p_spq->p_virt)
+		dma_free_coherent(&p_hwfn->cdev->pdev->dev,
+				  p_spq->chain.capacity *
+				  sizeof(struct qed_spq_entry),
+				  p_spq->p_virt,
+				  p_spq->p_phys);
+
+	qed_chain_free(p_hwfn->cdev, &p_spq->chain);
+	;
+	kfree(p_spq);
+}
+
+int
+qed_spq_get_entry(struct qed_hwfn *p_hwfn,
+		  struct qed_spq_entry **pp_ent)
+{
+	struct qed_spq *p_spq = p_hwfn->p_spq;
+	struct qed_spq_entry *p_ent = NULL;
+	int rc = 0;
+
+	spin_lock_bh(&p_spq->lock);
+
+	if (list_empty(&p_spq->free_pool)) {
+		p_ent = kzalloc(sizeof(*p_ent), GFP_ATOMIC);
+		if (!p_ent) {
+			rc = -ENOMEM;
+			goto out_unlock;
+		}
+		p_ent->queue = &p_spq->unlimited_pending;
+	} else {
+		p_ent = list_first_entry(&p_spq->free_pool,
+					 struct qed_spq_entry,
+					 list);
+		list_del(&p_ent->list);
+		p_ent->queue = &p_spq->pending;
+	}
+
+	*pp_ent = p_ent;
+
+out_unlock:
+	spin_unlock_bh(&p_spq->lock);
+	return rc;
+}
+
+/* Locked variant; Should be called while the SPQ lock is taken */
+static void __qed_spq_return_entry(struct qed_hwfn *p_hwfn,
+				   struct qed_spq_entry *p_ent)
+{
+	list_add_tail(&p_ent->list, &p_hwfn->p_spq->free_pool);
+}
+
+void qed_spq_return_entry(struct qed_hwfn *p_hwfn,
+			  struct qed_spq_entry *p_ent)
+{
+	spin_lock_bh(&p_hwfn->p_spq->lock);
+	__qed_spq_return_entry(p_hwfn, p_ent);
+	spin_unlock_bh(&p_hwfn->p_spq->lock);
+}
+
+/**
+ * @brief qed_spq_add_entry - adds a new entry to the pending
+ *        list. Should be used while lock is being held.
+ *
+ * Addes an entry to the pending list is there is room (en empty
+ * element is available in the free_pool), or else places the
+ * entry in the unlimited_pending pool.
+ *
+ * @param p_hwfn
+ * @param p_ent
+ * @param priority
+ *
+ * @return int
+ */
+static int
+qed_spq_add_entry(struct qed_hwfn *p_hwfn,
+		  struct qed_spq_entry *p_ent,
+		  enum spq_priority priority)
+{
+	struct qed_spq *p_spq = p_hwfn->p_spq;
+
+	if (p_ent->queue == &p_spq->unlimited_pending) {
+		struct qed_spq_entry *p_en2;
+
+		if (list_empty(&p_spq->free_pool)) {
+			list_add_tail(&p_ent->list, &p_spq->unlimited_pending);
+			p_spq->unlimited_pending_count++;
+
+			return 0;
+		}
+
+		p_en2 = list_first_entry(&p_spq->free_pool,
+					 struct qed_spq_entry,
+					 list);
+		list_del(&p_en2->list);
+
+		/* Strcut assignment */
+		*p_en2 = *p_ent;
+
+		kfree(p_ent);
+
+		p_ent = p_en2;
+	}
+
+	/* entry is to be placed in 'pending' queue */
+	switch (priority) {
+	case QED_SPQ_PRIORITY_NORMAL:
+		list_add_tail(&p_ent->list, &p_spq->pending);
+		p_spq->normal_count++;
+		break;
+	case QED_SPQ_PRIORITY_HIGH:
+		list_add(&p_ent->list, &p_spq->pending);
+		p_spq->high_count++;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+/***************************************************************************
+* Accessor
+***************************************************************************/
+u32 qed_spq_get_cid(struct qed_hwfn *p_hwfn)
+{
+	if (!p_hwfn->p_spq)
+		return 0xffffffff;      /* illegal */
+	return p_hwfn->p_spq->cid;
+}
+
+/***************************************************************************
+* Posting new Ramrods
+***************************************************************************/
+static int qed_spq_post_list(struct qed_hwfn *p_hwfn,
+			     struct list_head *head,
+			     u32 keep_reserve)
+{
+	struct qed_spq *p_spq = p_hwfn->p_spq;
+	int rc;
+
+	while (qed_chain_get_elem_left(&p_spq->chain) > keep_reserve &&
+	       !list_empty(head)) {
+		struct qed_spq_entry *p_ent =
+			list_first_entry(head, struct qed_spq_entry, list);
+		list_del(&p_ent->list);
+		list_add_tail(&p_ent->list, &p_spq->completion_pending);
+		p_spq->comp_sent_count++;
+
+		rc = qed_spq_hw_post(p_hwfn, p_spq, p_ent);
+		if (rc) {
+			list_del(&p_ent->list);
+			__qed_spq_return_entry(p_hwfn, p_ent);
+			return rc;
+		}
+	}
+
+	return 0;
+}
+
+static int qed_spq_pend_post(struct qed_hwfn *p_hwfn)
+{
+	struct qed_spq *p_spq = p_hwfn->p_spq;
+	struct qed_spq_entry *p_ent = NULL;
+
+	while (!list_empty(&p_spq->free_pool)) {
+		if (list_empty(&p_spq->unlimited_pending))
+			break;
+
+		p_ent = list_first_entry(&p_spq->unlimited_pending,
+					 struct qed_spq_entry,
+					 list);
+		if (!p_ent)
+			return -EINVAL;
+
+		list_del(&p_ent->list);
+
+		qed_spq_add_entry(p_hwfn, p_ent, p_ent->priority);
+	}
+
+	return qed_spq_post_list(p_hwfn, &p_spq->pending,
+				 SPQ_HIGH_PRI_RESERVE_DEFAULT);
+}
+
+int qed_spq_post(struct qed_hwfn *p_hwfn,
+		 struct qed_spq_entry *p_ent,
+		 u8 *fw_return_code)
+{
+	int rc = 0;
+	struct qed_spq *p_spq = p_hwfn ? p_hwfn->p_spq : NULL;
+	bool b_ret_ent = true;
+
+	if (!p_hwfn)
+		return -EINVAL;
+
+	if (!p_ent) {
+		DP_NOTICE(p_hwfn, "Got a NULL pointer\n");
+		return -EINVAL;
+	}
+
+	/* Complete the entry */
+	rc = qed_spq_fill_entry(p_hwfn, p_ent);
+
+	spin_lock_bh(&p_spq->lock);
+
+	/* Check return value after LOCK is taken for cleaner error flow */
+	if (rc)
+		goto spq_post_fail;
+
+	/* Add the request to the pending queue */
+	rc = qed_spq_add_entry(p_hwfn, p_ent, p_ent->priority);
+	if (rc)
+		goto spq_post_fail;
+
+	rc = qed_spq_pend_post(p_hwfn);
+	if (rc) {
+		/* Since it's possible that pending failed for a different
+		 * entry [although unlikely], the failed entry was already
+		 * dealt with; No need to return it here.
+		 */
+		b_ret_ent = false;
+		goto spq_post_fail;
+	}
+
+	spin_unlock_bh(&p_spq->lock);
+
+	if (p_ent->comp_mode == QED_SPQ_MODE_EBLOCK) {
+		/* For entries in QED BLOCK mode, the completion code cannot
+		 * perform the necessary cleanup - if it did, we couldn't
+		 * access p_ent here to see whether it's successful or not.
+		 * Thus, after gaining the answer perform the cleanup here.
+		 */
+		rc = qed_spq_block(p_hwfn, p_ent, fw_return_code);
+		if (rc)
+			goto spq_post_fail2;
+
+		/* return to pool */
+		qed_spq_return_entry(p_hwfn, p_ent);
+	}
+	return rc;
+
+spq_post_fail2:
+	spin_lock_bh(&p_spq->lock);
+	list_del(&p_ent->list);
+	qed_chain_return_produced(&p_spq->chain);
+
+spq_post_fail:
+	/* return to the free pool */
+	if (b_ret_ent)
+		__qed_spq_return_entry(p_hwfn, p_ent);
+	spin_unlock_bh(&p_spq->lock);
+
+	return rc;
+}
+
+int qed_spq_completion(struct qed_hwfn *p_hwfn,
+		       __le16 echo,
+		       u8 fw_return_code,
+		       union event_ring_data *p_data)
+{
+	struct qed_spq		*p_spq;
+	struct qed_spq_entry	*p_ent = NULL;
+	struct qed_spq_entry	*tmp;
+	struct qed_spq_entry	*found = NULL;
+	int			rc;
+
+	if (!p_hwfn)
+		return -EINVAL;
+
+	p_spq = p_hwfn->p_spq;
+	if (!p_spq)
+		return -EINVAL;
+
+	spin_lock_bh(&p_spq->lock);
+	list_for_each_entry_safe(p_ent, tmp, &p_spq->completion_pending,
+				 list) {
+		if (p_ent->elem.hdr.echo == echo) {
+			list_del(&p_ent->list);
+
+			qed_chain_return_produced(&p_spq->chain);
+			p_spq->comp_count++;
+			found = p_ent;
+			break;
+		}
+	}
+
+	/* Release lock before callback, as callback may post
+	 * an additional ramrod.
+	 */
+	spin_unlock_bh(&p_spq->lock);
+
+	if (!found) {
+		DP_NOTICE(p_hwfn,
+			  "Failed to find an entry this EQE completes\n");
+		return -EEXIST;
+	}
+
+	DP_VERBOSE(p_hwfn, QED_MSG_SPQ, "Complete: func %p cookie %p)\n",
+		   p_ent->comp_cb.function, p_ent->comp_cb.cookie);
+	if (found->comp_cb.function)
+		found->comp_cb.function(p_hwfn, found->comp_cb.cookie, p_data,
+					fw_return_code);
+
+	if (found->comp_mode != QED_SPQ_MODE_EBLOCK)
+		/* EBLOCK is responsible for freeing its own entry */
+		qed_spq_return_entry(p_hwfn, found);
+
+	/* Attempt to post pending requests */
+	spin_lock_bh(&p_spq->lock);
+	rc = qed_spq_pend_post(p_hwfn);
+	spin_unlock_bh(&p_spq->lock);
+
+	return rc;
+}
+
+struct qed_consq *qed_consq_alloc(struct qed_hwfn *p_hwfn)
+{
+	struct qed_consq *p_consq;
+
+	/* Allocate ConsQ struct */
+	p_consq = kzalloc(sizeof(*p_consq), GFP_ATOMIC);
+	if (!p_consq) {
+		DP_NOTICE(p_hwfn, "Failed to allocate `struct qed_consq'\n");
+		return NULL;
+	}
+
+	/* Allocate and initialize EQ chain*/
+	if (qed_chain_alloc(p_hwfn->cdev,
+			    QED_CHAIN_USE_TO_PRODUCE,
+			    QED_CHAIN_MODE_PBL,
+			    QED_CHAIN_PAGE_SIZE / 0x80,
+			    0x80,
+			    &p_consq->chain)) {
+		DP_NOTICE(p_hwfn, "Failed to allocate consq chain");
+		goto consq_allocate_fail;
+	}
+
+	return p_consq;
+
+consq_allocate_fail:
+	qed_consq_free(p_hwfn, p_consq);
+	return NULL;
+}
+
+void qed_consq_setup(struct qed_hwfn *p_hwfn,
+		     struct qed_consq *p_consq)
+{
+	qed_chain_reset(&p_consq->chain);
+}
+
+void qed_consq_free(struct qed_hwfn *p_hwfn,
+		    struct qed_consq *p_consq)
+{
+	if (!p_consq)
+		return;
+	qed_chain_free(p_hwfn->cdev, &p_consq->chain);
+	kfree(p_consq);
+}