src/ce/ce_service.c

/*
 * Copyright (c) 2013-2017 The Linux Foundation. All rights reserved.
 *
 * Previously licensed under the ISC license by Qualcomm Atheros, Inc.
 *
 *
 * Permission to use, copy, modify, and/or distribute this software for
 * any purpose with or without fee is hereby granted, provided that the
 * above copyright notice and this permission notice appear in all
 * copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL
 * WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE
 * AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
 * PERFORMANCE OF THIS SOFTWARE.
 */

/*
 * This file was originally distributed by Qualcomm Atheros, Inc.
 * under proprietary terms before Copyright ownership was assigned
 * to the Linux Foundation.
 */

#include "hif.h"
#include "hif_io32.h"
#include "ce_api.h"
#include "ce_main.h"
#include "ce_internal.h"
#include "ce_reg.h"
#include "qdf_lock.h"
#include "regtable.h"
#include "hif_main.h"
#include "hif_debug.h"
#include "hif_napi.h"

#ifdef IPA_OFFLOAD
#ifdef QCA_WIFI_3_0
#define CE_IPA_RING_INIT(ce_desc)                       \
	do {                                            \
		ce_desc->gather = 0;                    \
		ce_desc->enable_11h = 0;                \
		ce_desc->meta_data_low = 0;             \
		ce_desc->packet_result_offset = 64;     \
		ce_desc->toeplitz_hash_enable = 0;      \
		ce_desc->addr_y_search_disable = 0;     \
		ce_desc->addr_x_search_disable = 0;     \
		ce_desc->misc_int_disable = 0;          \
		ce_desc->target_int_disable = 0;        \
		ce_desc->host_int_disable = 0;          \
		ce_desc->dest_byte_swap = 0;            \
		ce_desc->byte_swap = 0;                 \
		ce_desc->type = 2;                      \
		ce_desc->tx_classify = 1;               \
		ce_desc->buffer_addr_hi = 0;            \
		ce_desc->meta_data = 0;                 \
		ce_desc->nbytes = 128;                  \
	} while (0)
#else
#define CE_IPA_RING_INIT(ce_desc)                       \
	do {                                            \
		ce_desc->byte_swap = 0;                 \
		ce_desc->nbytes = 60;                   \
		ce_desc->gather = 0;                    \
	} while (0)
#endif /* QCA_WIFI_3_0 */
#endif /* IPA_OFFLOAD */

#ifndef DATA_CE_SW_INDEX_NO_INLINE_UPDATE
#define DATA_CE_UPDATE_SWINDEX(x, scn, addr)				\
	do {                                            		\
		x = CE_SRC_RING_READ_IDX_GET_FROM_DDR(scn, addr); 	\
	} while (0);
#else
#define DATA_CE_UPDATE_SWINDEX(x, scn, addr)
#endif

static int war1_allow_sleep;
/* io32 write workaround */
static int hif_ce_war1;

/**
 * hif_ce_war_disable() - disable ce war gobally
 */
void hif_ce_war_disable(void)
{
	hif_ce_war1 = 0;
}

/**
 * hif_ce_war_enable() - enable ce war gobally
 */
void hif_ce_war_enable(void)
{
	hif_ce_war1 = 1;
}

#ifdef HIF_CONFIG_SLUB_DEBUG_ON

/**
 * struct hif_ce_event - structure for detailing a ce event
 * @type: what the event was
 * @time: when it happened
 * @descriptor: descriptor enqueued or dequeued
 * @memory: virtual address that was used
 * @index: location of the descriptor in the ce ring;
 */
struct hif_ce_desc_event {
	uint16_t index;
	enum hif_ce_event_type type;
	uint64_t time;
	union ce_desc descriptor;
	void *memory;
};

/* max history to record per copy engine */
#define HIF_CE_HISTORY_MAX 512
qdf_atomic_t hif_ce_desc_history_index[CE_COUNT_MAX];
struct hif_ce_desc_event hif_ce_desc_history[CE_COUNT_MAX][HIF_CE_HISTORY_MAX];


/**
 * get_next_record_index() - get the next record index
 * @table_index: atomic index variable to increment
 * @array_size: array size of the circular buffer
 *
 * Increment the atomic index and reserve the value.
 * Takes care of buffer wrap.
 * Guaranteed to be thread safe as long as fewer than array_size contexts
 * try to access the array.  If there are more than array_size contexts
 * trying to access the array, full locking of the recording process would
 * be needed to have sane logging.
 */
static int get_next_record_index(qdf_atomic_t *table_index, int array_size)
{
	int record_index = qdf_atomic_inc_return(table_index);

	if (record_index == array_size)
		qdf_atomic_sub(array_size, table_index);

	while (record_index >= array_size)
		record_index -= array_size;
	return record_index;
}

/**
 * hif_record_ce_desc_event() - record ce descriptor events
 * @scn: hif_softc
 * @ce_id: which ce is the event occuring on
 * @type: what happened
 * @descriptor: pointer to the descriptor posted/completed
 * @memory: virtual address of buffer related to the descriptor
 * @index: index that the descriptor was/will be at.
 */
void hif_record_ce_desc_event(struct hif_softc *scn, int ce_id,
				enum hif_ce_event_type type,
				union ce_desc *descriptor,
				void *memory, int index)
{
	int record_index = get_next_record_index(
			&hif_ce_desc_history_index[ce_id], HIF_CE_HISTORY_MAX);

	struct hif_ce_desc_event *event =
		&hif_ce_desc_history[ce_id][record_index];
	event->type = type;
	event->time = qdf_get_log_timestamp();

	if (descriptor != NULL)
		event->descriptor = *descriptor;
	else
		memset(&event->descriptor, 0, sizeof(union ce_desc));
	event->memory = memory;
	event->index = index;
}

/**
 * ce_init_ce_desc_event_log() - initialize the ce event log
 * @ce_id: copy engine id for which we are initializing the log
 * @size: size of array to dedicate
 *
 * Currently the passed size is ignored in favor of a precompiled value.
 */
void ce_init_ce_desc_event_log(int ce_id, int size)
{
	qdf_atomic_init(&hif_ce_desc_history_index[ce_id]);
}
#else
void hif_record_ce_desc_event(struct hif_softc *scn,
		int ce_id, enum hif_ce_event_type type,
		union ce_desc *descriptor, void *memory,
		int index)
{
}

inline void ce_init_ce_desc_event_log(int ce_id, int size)
{
}
#endif

#ifdef NAPI_YIELD_BUDGET_BASED
bool hif_ce_service_should_yield(struct hif_softc *scn,
				 struct CE_state *ce_state)
{
	bool yield =  hif_max_num_receives_reached(scn, ce_state->receive_count);
	return yield;
}
#else
/**
 * hif_ce_service_should_yield() - return true if the service is hogging the cpu
 * @scn: hif context
 * @ce_state: context of the copy engine being serviced
 *
 * Return: true if the service should yield
 */
bool hif_ce_service_should_yield(struct hif_softc *scn,
				 struct CE_state *ce_state)
{
	bool yield, time_limit_reached, rxpkt_thresh_reached = 0;

	time_limit_reached =
		sched_clock() > ce_state->ce_service_yield_time ? 1 : 0;

	if (!time_limit_reached)
		rxpkt_thresh_reached = hif_max_num_receives_reached
					(scn, ce_state->receive_count);

	yield =  time_limit_reached || rxpkt_thresh_reached;

	if (yield)
		hif_napi_update_yield_stats(ce_state,
					    time_limit_reached,
					    rxpkt_thresh_reached);
	return yield;
}
#endif
/*
 * Support for Copy Engine hardware, which is mainly used for
 * communication between Host and Target over a PCIe interconnect.
 */

/*
 * A single CopyEngine (CE) comprises two "rings":
 *   a source ring
 *   a destination ring
 *
 * Each ring consists of a number of descriptors which specify
 * an address, length, and meta-data.
 *
 * Typically, one side of the PCIe interconnect (Host or Target)
 * controls one ring and the other side controls the other ring.
 * The source side chooses when to initiate a transfer and it
 * chooses what to send (buffer address, length). The destination
 * side keeps a supply of "anonymous receive buffers" available and
 * it handles incoming data as it arrives (when the destination
 * recieves an interrupt).
 *
 * The sender may send a simple buffer (address/length) or it may
 * send a small list of buffers.  When a small list is sent, hardware
 * "gathers" these and they end up in a single destination buffer
 * with a single interrupt.
 *
 * There are several "contexts" managed by this layer -- more, it
 * may seem -- than should be needed. These are provided mainly for
 * maximum flexibility and especially to facilitate a simpler HIF
 * implementation. There are per-CopyEngine recv, send, and watermark
 * contexts. These are supplied by the caller when a recv, send,
 * or watermark handler is established and they are echoed back to
 * the caller when the respective callbacks are invoked. There is
 * also a per-transfer context supplied by the caller when a buffer
 * (or sendlist) is sent and when a buffer is enqueued for recv.
 * These per-transfer contexts are echoed back to the caller when
 * the buffer is sent/received.
 * Target TX harsh result toeplitz_hash_result
 */

/*
 * Guts of ce_send, used by both ce_send and ce_sendlist_send.
 * The caller takes responsibility for any needed locking.
 */

static
void war_ce_src_ring_write_idx_set(struct hif_softc *scn,
				   u32 ctrl_addr, unsigned int write_index)
{
	if (hif_ce_war1) {
		void __iomem *indicator_addr;

		indicator_addr = scn->mem + ctrl_addr + DST_WATERMARK_ADDRESS;

		if (!war1_allow_sleep
		    && ctrl_addr == CE_BASE_ADDRESS(CDC_WAR_DATA_CE)) {
			hif_write32_mb(indicator_addr,
				      (CDC_WAR_MAGIC_STR | write_index));
		} else {
			unsigned long irq_flags;

			local_irq_save(irq_flags);
			hif_write32_mb(indicator_addr, 1);

			/*
			 * PCIE write waits for ACK in IPQ8K, there is no
			 * need to read back value.
			 */
			(void)hif_read32_mb(indicator_addr);
			(void)hif_read32_mb(indicator_addr); /* conservative */

			CE_SRC_RING_WRITE_IDX_SET(scn,
						  ctrl_addr, write_index);

			hif_write32_mb(indicator_addr, 0);
			local_irq_restore(irq_flags);
		}
	} else {
		CE_SRC_RING_WRITE_IDX_SET(scn, ctrl_addr, write_index);
	}
}

#ifdef HIF_CONFIG_SLUB_DEBUG_ON
/**
 * ce_validate_nbytes() - validate nbytes for slub builds on tx descriptors
 * @nbytes: nbytes value being written into a send descriptor
 * @ce_state: context of the copy engine

 * nbytes should be non-zero and less than max configured for the copy engine
 *
 * Return: none
 */
static void ce_validate_nbytes(uint32_t nbytes, struct CE_state *ce_state)
{
	if (nbytes <= 0 || nbytes > ce_state->src_sz_max)
		QDF_BUG(0);
}
#else
static void ce_validate_nbytes(uint32_t nbytes, struct CE_state *ce_state)
{
}
#endif

static int
ce_send_nolock_legacy(struct CE_handle *copyeng,
			   void *per_transfer_context,
			   qdf_dma_addr_t buffer,
			   uint32_t nbytes,
			   uint32_t transfer_id,
			   uint32_t flags,
			   uint32_t user_flags)
{
	int status;
	struct CE_state *CE_state = (struct CE_state *)copyeng;
	struct CE_ring_state *src_ring = CE_state->src_ring;
	uint32_t ctrl_addr = CE_state->ctrl_addr;
	unsigned int nentries_mask = src_ring->nentries_mask;
	unsigned int sw_index = src_ring->sw_index;
	unsigned int write_index = src_ring->write_index;
	uint64_t dma_addr = buffer;
	struct hif_softc *scn = CE_state->scn;

	if (Q_TARGET_ACCESS_BEGIN(scn) < 0)
		return QDF_STATUS_E_FAILURE;
	if (unlikely(CE_RING_DELTA(nentries_mask,
				write_index, sw_index - 1) <= 0)) {
		OL_ATH_CE_PKT_ERROR_COUNT_INCR(scn, CE_RING_DELTA_FAIL);
		Q_TARGET_ACCESS_END(scn);
		return QDF_STATUS_E_FAILURE;
	}
	{
		enum hif_ce_event_type event_type;
		struct CE_src_desc *src_ring_base =
			(struct CE_src_desc *)src_ring->base_addr_owner_space;
		struct CE_src_desc *shadow_base =
			(struct CE_src_desc *)src_ring->shadow_base;
		struct CE_src_desc *src_desc =
			CE_SRC_RING_TO_DESC(src_ring_base, write_index);
		struct CE_src_desc *shadow_src_desc =
			CE_SRC_RING_TO_DESC(shadow_base, write_index);

		/* Update low 32 bits source descriptor address */
		shadow_src_desc->buffer_addr =
			(uint32_t)(dma_addr & 0xFFFFFFFF);
#ifdef QCA_WIFI_3_0
		shadow_src_desc->buffer_addr_hi =
			(uint32_t)((dma_addr >> 32) & 0x1F);
		user_flags |= shadow_src_desc->buffer_addr_hi;
		memcpy(&(((uint32_t *)shadow_src_desc)[1]), &user_flags,
			   sizeof(uint32_t));
#endif
		shadow_src_desc->target_int_disable = 0;
		shadow_src_desc->host_int_disable = 0;

		shadow_src_desc->meta_data = transfer_id;

		/*
		 * Set the swap bit if:
		 * typical sends on this CE are swapped (host is big-endian)
		 * and this send doesn't disable the swapping
		 * (data is not bytestream)
		 */
		shadow_src_desc->byte_swap =
			(((CE_state->attr_flags & CE_ATTR_BYTE_SWAP_DATA)
			 != 0) & ((flags & CE_SEND_FLAG_SWAP_DISABLE) == 0));
		shadow_src_desc->gather = ((flags & CE_SEND_FLAG_GATHER) != 0);
		shadow_src_desc->nbytes = nbytes;
		ce_validate_nbytes(nbytes, CE_state);

		*src_desc = *shadow_src_desc;

		src_ring->per_transfer_context[write_index] =
			per_transfer_context;

		/* Update Source Ring Write Index */
		write_index = CE_RING_IDX_INCR(nentries_mask, write_index);

		/* WORKAROUND */
		if (shadow_src_desc->gather) {
			event_type = HIF_TX_GATHER_DESC_POST;
		} else if (qdf_unlikely(CE_state->state != CE_RUNNING)) {
			event_type = HIF_TX_DESC_SOFTWARE_POST;
			CE_state->state = CE_PENDING;
		} else {
			event_type = HIF_TX_DESC_POST;
			war_ce_src_ring_write_idx_set(scn, ctrl_addr,
						      write_index);
		}

		/* src_ring->write index hasn't been updated event though
		 * the register has allready been written to.
		 */
		hif_record_ce_desc_event(scn, CE_state->id, event_type,
			(union ce_desc *) shadow_src_desc, per_transfer_context,
			src_ring->write_index);

		src_ring->write_index = write_index;
		status = QDF_STATUS_SUCCESS;
	}
	Q_TARGET_ACCESS_END(scn);
	return status;
}

int
ce_send(struct CE_handle *copyeng,
		void *per_transfer_context,
		qdf_dma_addr_t buffer,
		uint32_t nbytes,
		uint32_t transfer_id,
		uint32_t flags,
		uint32_t user_flag)
{
	struct CE_state *CE_state = (struct CE_state *)copyeng;
	int status;
	struct HIF_CE_state *hif_state = HIF_GET_CE_STATE(CE_state->scn);

	qdf_spin_lock_bh(&CE_state->ce_index_lock);
	status = hif_state->ce_services->ce_send_nolock(copyeng,
			per_transfer_context, buffer, nbytes,
			transfer_id, flags, user_flag);
	qdf_spin_unlock_bh(&CE_state->ce_index_lock);

	return status;
}

unsigned int ce_sendlist_sizeof(void)
{
	return sizeof(struct ce_sendlist);
}

void ce_sendlist_init(struct ce_sendlist *sendlist)
{
	struct ce_sendlist_s *sl = (struct ce_sendlist_s *)sendlist;

	sl->num_items = 0;
}

int
ce_sendlist_buf_add(struct ce_sendlist *sendlist,
					qdf_dma_addr_t buffer,
					uint32_t nbytes,
					uint32_t flags,
					uint32_t user_flags)
{
	struct ce_sendlist_s *sl = (struct ce_sendlist_s *)sendlist;
	unsigned int num_items = sl->num_items;
	struct ce_sendlist_item *item;

	if (num_items >= CE_SENDLIST_ITEMS_MAX) {
		QDF_ASSERT(num_items < CE_SENDLIST_ITEMS_MAX);
		return QDF_STATUS_E_RESOURCES;
	}

	item = &sl->item[num_items];
	item->send_type = CE_SIMPLE_BUFFER_TYPE;
	item->data = buffer;
	item->u.nbytes = nbytes;
	item->flags = flags;
	item->user_flags = user_flags;
	sl->num_items = num_items + 1;
	return QDF_STATUS_SUCCESS;
}

int
ce_sendlist_send(struct CE_handle *copyeng,
		 void *per_transfer_context,
		 struct ce_sendlist *sendlist, unsigned int transfer_id)
{
	struct CE_state *CE_state = (struct CE_state *)copyeng;
	struct HIF_CE_state *hif_state = HIF_GET_CE_STATE(CE_state->scn);

	return hif_state->ce_services->ce_sendlist_send(copyeng,
			per_transfer_context, sendlist, transfer_id);
}

static int
ce_sendlist_send_legacy(struct CE_handle *copyeng,
		 void *per_transfer_context,
		 struct ce_sendlist *sendlist, unsigned int transfer_id)
{
	int status = -ENOMEM;
	struct ce_sendlist_s *sl = (struct ce_sendlist_s *)sendlist;
	struct CE_state *CE_state = (struct CE_state *)copyeng;
	struct CE_ring_state *src_ring = CE_state->src_ring;
	unsigned int nentries_mask = src_ring->nentries_mask;
	unsigned int num_items = sl->num_items;
	unsigned int sw_index;
	unsigned int write_index;
	struct hif_softc *scn = CE_state->scn;

	QDF_ASSERT((num_items > 0) && (num_items < src_ring->nentries));

	qdf_spin_lock_bh(&CE_state->ce_index_lock);

	if (CE_state->scn->fastpath_mode_on && CE_state->htt_tx_data &&
	    Q_TARGET_ACCESS_BEGIN(scn) == 0) {
		src_ring->sw_index = CE_SRC_RING_READ_IDX_GET_FROM_DDR(
					       scn, CE_state->ctrl_addr);
		Q_TARGET_ACCESS_END(scn);
	}

	sw_index = src_ring->sw_index;
	write_index = src_ring->write_index;

	if (CE_RING_DELTA(nentries_mask, write_index, sw_index - 1) >=
	    num_items) {
		struct ce_sendlist_item *item;
		int i;

		/* handle all but the last item uniformly */
		for (i = 0; i < num_items - 1; i++) {
			item = &sl->item[i];
			/* TBDXXX: Support extensible sendlist_types? */
			QDF_ASSERT(item->send_type == CE_SIMPLE_BUFFER_TYPE);
			status = ce_send_nolock_legacy(copyeng,
				CE_SENDLIST_ITEM_CTXT,
				(qdf_dma_addr_t) item->data,
				item->u.nbytes, transfer_id,
				item->flags | CE_SEND_FLAG_GATHER,
				item->user_flags);
			QDF_ASSERT(status == QDF_STATUS_SUCCESS);
		}
		/* provide valid context pointer for final item */
		item = &sl->item[i];
		/* TBDXXX: Support extensible sendlist_types? */
		QDF_ASSERT(item->send_type == CE_SIMPLE_BUFFER_TYPE);
		status = ce_send_nolock_legacy(copyeng, per_transfer_context,
					(qdf_dma_addr_t) item->data,
					item->u.nbytes,
					transfer_id, item->flags,
					item->user_flags);
		QDF_ASSERT(status == QDF_STATUS_SUCCESS);
		QDF_NBUF_UPDATE_TX_PKT_COUNT((qdf_nbuf_t)per_transfer_context,
					QDF_NBUF_TX_PKT_CE);
		DPTRACE(qdf_dp_trace((qdf_nbuf_t)per_transfer_context,
			QDF_DP_TRACE_CE_PACKET_PTR_RECORD,
			(uint8_t *)&(((qdf_nbuf_t)per_transfer_context)->data),
			sizeof(((qdf_nbuf_t)per_transfer_context)->data),
			QDF_TX));
	} else {
		/*
		 * Probably not worth the additional complexity to support
		 * partial sends with continuation or notification.  We expect
		 * to use large rings and small sendlists. If we can't handle
		 * the entire request at once, punt it back to the caller.
		 */
	}
	qdf_spin_unlock_bh(&CE_state->ce_index_lock);

	return status;
}

#ifdef WLAN_FEATURE_FASTPATH
#ifdef QCA_WIFI_3_0
static inline void
ce_buffer_addr_hi_set(struct CE_src_desc *shadow_src_desc,
		      uint64_t dma_addr,
		      uint32_t user_flags)
{
	shadow_src_desc->buffer_addr_hi =
			(uint32_t)((dma_addr >> 32) & 0x1F);
	user_flags |= shadow_src_desc->buffer_addr_hi;
	memcpy(&(((uint32_t *)shadow_src_desc)[1]), &user_flags,
			sizeof(uint32_t));
}
#else
static inline void
ce_buffer_addr_hi_set(struct CE_src_desc *shadow_src_desc,
		      uint64_t dma_addr,
		      uint32_t user_flags)
{
}
#endif

#define SLOTS_PER_DATAPATH_TX 2

/**
 * ce_send_fast() CE layer Tx buffer posting function
 * @copyeng: copy engine handle
 * @msdu: msdu to be sent
 * @transfer_id: transfer_id
 * @download_len: packet download length
 *
 * Assumption : Called with an array of MSDU's
 * Function:
 * For each msdu in the array
 * 1. Check no. of available entries
 * 2. Create src ring entries (allocated in consistent memory
 * 3. Write index to h/w
 *
 * Return: No. of packets that could be sent
 */
int ce_send_fast(struct CE_handle *copyeng, qdf_nbuf_t msdu,
		 unsigned int transfer_id, uint32_t download_len)
{
	struct CE_state *ce_state = (struct CE_state *)copyeng;
	struct hif_softc *scn = ce_state->scn;
	struct hif_opaque_softc *hif_hdl = GET_HIF_OPAQUE_HDL(scn);
	struct CE_ring_state *src_ring = ce_state->src_ring;
	u_int32_t ctrl_addr = ce_state->ctrl_addr;
	unsigned int nentries_mask = src_ring->nentries_mask;
	unsigned int write_index;
	unsigned int sw_index;
	unsigned int frag_len;
	uint64_t dma_addr;
	uint32_t user_flags;
	enum hif_ce_event_type type = FAST_TX_SOFTWARE_INDEX_UPDATE;
	bool ok_to_send = true;

	qdf_spin_lock_bh(&ce_state->ce_index_lock);

	/*
	 * Request runtime PM resume if it has already suspended and make
	 * sure there is no PCIe link access.
	 */
	if (hif_pm_runtime_get(hif_hdl) != 0)
		ok_to_send = false;

	if (ok_to_send) {
		Q_TARGET_ACCESS_BEGIN(scn);
		DATA_CE_UPDATE_SWINDEX(src_ring->sw_index, scn, ctrl_addr);
	}

	write_index = src_ring->write_index;
	sw_index = src_ring->sw_index;

	hif_record_ce_desc_event(scn, ce_state->id,
				FAST_TX_SOFTWARE_INDEX_UPDATE,
				NULL, NULL, sw_index);

	if (qdf_unlikely(CE_RING_DELTA(nentries_mask, write_index, sw_index - 1)
			 < SLOTS_PER_DATAPATH_TX)) {
		HIF_ERROR("Source ring full, required %d, available %d",
		      SLOTS_PER_DATAPATH_TX,
		      CE_RING_DELTA(nentries_mask, write_index, sw_index - 1));
		OL_ATH_CE_PKT_ERROR_COUNT_INCR(scn, CE_RING_DELTA_FAIL);
		if (ok_to_send)
			Q_TARGET_ACCESS_END(scn);
		qdf_spin_unlock_bh(&ce_state->ce_index_lock);
		return 0;
	}

	{
		struct CE_src_desc *src_ring_base =
			(struct CE_src_desc *)src_ring->base_addr_owner_space;
		struct CE_src_desc *shadow_base =
			(struct CE_src_desc *)src_ring->shadow_base;
		struct CE_src_desc *src_desc =
			CE_SRC_RING_TO_DESC(src_ring_base, write_index);
		struct CE_src_desc *shadow_src_desc =
			CE_SRC_RING_TO_DESC(shadow_base, write_index);

		hif_pm_runtime_get_noresume(hif_hdl);

		/*
		 * First fill out the ring descriptor for the HTC HTT frame
		 * header. These are uncached writes. Should we use a local
		 * structure instead?
		 */
		/* HTT/HTC header can be passed as a argument */
		dma_addr = qdf_nbuf_get_frag_paddr(msdu, 0);
		shadow_src_desc->buffer_addr = (uint32_t)(dma_addr &
							  0xFFFFFFFF);
		user_flags = qdf_nbuf_data_attr_get(msdu) & DESC_DATA_FLAG_MASK;
		ce_buffer_addr_hi_set(shadow_src_desc, dma_addr, user_flags);
			shadow_src_desc->meta_data = transfer_id;
		shadow_src_desc->nbytes = qdf_nbuf_get_frag_len(msdu, 0);
		ce_validate_nbytes(shadow_src_desc->nbytes, ce_state);
		download_len -= shadow_src_desc->nbytes;
		/*
		 * HTC HTT header is a word stream, so byte swap if CE byte
		 * swap enabled
		 */
		shadow_src_desc->byte_swap = ((ce_state->attr_flags &
					CE_ATTR_BYTE_SWAP_DATA) != 0);
		/* For the first one, it still does not need to write */
		shadow_src_desc->gather = 1;
		*src_desc = *shadow_src_desc;
		/* By default we could initialize the transfer context to this
		 * value
		 */
		src_ring->per_transfer_context[write_index] =
			CE_SENDLIST_ITEM_CTXT;
		write_index = CE_RING_IDX_INCR(nentries_mask, write_index);

		src_desc = CE_SRC_RING_TO_DESC(src_ring_base, write_index);
		shadow_src_desc = CE_SRC_RING_TO_DESC(shadow_base, write_index);
		/*
		 * Now fill out the ring descriptor for the actual data
		 * packet
		 */
		dma_addr = qdf_nbuf_get_frag_paddr(msdu, 1);
		shadow_src_desc->buffer_addr = (uint32_t)(dma_addr &
							  0xFFFFFFFF);
		/*
		 * Clear packet offset for all but the first CE desc.
		 */
		user_flags &= ~QDF_CE_TX_PKT_OFFSET_BIT_M;
		ce_buffer_addr_hi_set(shadow_src_desc, dma_addr, user_flags);
		shadow_src_desc->meta_data = transfer_id;

		/* get actual packet length */
		frag_len = qdf_nbuf_get_frag_len(msdu, 1);

		/* download remaining bytes of payload */
		shadow_src_desc->nbytes =  download_len;
		ce_validate_nbytes(shadow_src_desc->nbytes, ce_state);
		if (shadow_src_desc->nbytes > frag_len)
			shadow_src_desc->nbytes = frag_len;

		/*  Data packet is a byte stream, so disable byte swap */
		shadow_src_desc->byte_swap = 0;
		/* For the last one, gather is not set */
		shadow_src_desc->gather    = 0;
		*src_desc = *shadow_src_desc;
		src_ring->per_transfer_context[write_index] = msdu;
		write_index = CE_RING_IDX_INCR(nentries_mask, write_index);

		DPTRACE(qdf_dp_trace(msdu,
			QDF_DP_TRACE_CE_FAST_PACKET_PTR_RECORD,
			qdf_nbuf_data_addr(msdu),
			sizeof(qdf_nbuf_data(msdu)), QDF_TX));
	}

	src_ring->write_index = write_index;

	if (ok_to_send) {
		if (qdf_likely(ce_state->state == CE_RUNNING)) {
			type = FAST_TX_WRITE_INDEX_UPDATE;
			war_ce_src_ring_write_idx_set(scn, ctrl_addr,
				write_index);
			Q_TARGET_ACCESS_END(scn);
		} else
			ce_state->state = CE_PENDING;
		hif_pm_runtime_put(hif_hdl);
	}

	hif_record_ce_desc_event(scn, ce_state->id, type,
				 NULL, NULL, write_index);

	qdf_spin_unlock_bh(&ce_state->ce_index_lock);

	/* sent 1 packet */
	return 1;
}

/**
 * ce_is_fastpath_enabled() - returns true if fastpath mode is enabled
 * @scn: Handle to HIF context
 *
 * Return: true if fastpath is enabled else false.
 */
static bool ce_is_fastpath_enabled(struct hif_softc *scn)
{
	return scn->fastpath_mode_on;
}

/**
 * ce_is_fastpath_handler_registered() - return true for datapath CEs and if
 * fastpath is enabled.
 * @ce_state: handle to copy engine
 *
 * Return: true if fastpath handler is registered for datapath CE.
 */
static bool ce_is_fastpath_handler_registered(struct CE_state *ce_state)
{
	if (ce_state->fastpath_handler)
		return true;
	else
		return false;
}


#else
static inline bool ce_is_fastpath_enabled(struct hif_softc *scn)
{
	return false;
}

static inline bool ce_is_fastpath_handler_registered(struct CE_state *ce_state)
{
	return false;
}
#endif /* WLAN_FEATURE_FASTPATH */

#ifndef AH_NEED_TX_DATA_SWAP
#define AH_NEED_TX_DATA_SWAP 0
#endif

/**
 * ce_batch_send() - sends bunch of msdus at once
 * @ce_tx_hdl : pointer to CE handle
 * @msdu : list of msdus to be sent
 * @transfer_id : transfer id
 * @len : Downloaded length
 * @sendhead : sendhead
 *
 * Assumption : Called with an array of MSDU's
 * Function:
 * For each msdu in the array
 * 1. Send each msdu
 * 2. Increment write index accordinlgy.
 *
 * Return: list of msds not sent
 */
qdf_nbuf_t ce_batch_send(struct CE_handle *ce_tx_hdl,  qdf_nbuf_t msdu,
		uint32_t transfer_id, u_int32_t len, uint32_t sendhead)
{
	struct CE_state *ce_state = (struct CE_state *)ce_tx_hdl;
	struct hif_softc *scn = ce_state->scn;
	struct CE_ring_state *src_ring = ce_state->src_ring;
	u_int32_t ctrl_addr = ce_state->ctrl_addr;
	/*  A_target_id_t targid = TARGID(scn);*/

	uint32_t nentries_mask = src_ring->nentries_mask;
	uint32_t sw_index, write_index;

	struct CE_src_desc *src_desc_base =
		(struct CE_src_desc *)src_ring->base_addr_owner_space;
	uint32_t *src_desc;

	struct CE_src_desc lsrc_desc = {0};
	int deltacount = 0;
	qdf_nbuf_t freelist = NULL, hfreelist = NULL, tempnext;

	DATA_CE_UPDATE_SWINDEX(src_ring->sw_index, scn, ctrl_addr);
	sw_index = src_ring->sw_index;
	write_index = src_ring->write_index;

	deltacount = CE_RING_DELTA(nentries_mask, write_index, sw_index-1);

	while (msdu) {
		tempnext = qdf_nbuf_next(msdu);

		if (deltacount < 2) {
			if (sendhead)
				return msdu;
			HIF_ERROR("%s: Out of descriptors", __func__);
			src_ring->write_index = write_index;
			war_ce_src_ring_write_idx_set(scn, ctrl_addr,
					write_index);

			sw_index = src_ring->sw_index;
			write_index = src_ring->write_index;

			deltacount = CE_RING_DELTA(nentries_mask, write_index,
					sw_index-1);
			if (freelist == NULL) {
				freelist = msdu;
				hfreelist = msdu;
			} else {
				qdf_nbuf_set_next(freelist, msdu);
				freelist = msdu;
			}
			qdf_nbuf_set_next(msdu, NULL);
			msdu = tempnext;
			continue;
		}

		src_desc = (uint32_t *)CE_SRC_RING_TO_DESC(src_desc_base,
				write_index);

		src_desc[0]   = qdf_nbuf_get_frag_paddr(msdu, 0);

		lsrc_desc.meta_data = transfer_id;
		if (len  > msdu->len)
			len =  msdu->len;
		lsrc_desc.nbytes = len;
		/*  Data packet is a byte stream, so disable byte swap */
		lsrc_desc.byte_swap = AH_NEED_TX_DATA_SWAP;
		lsrc_desc.gather    = 0; /*For the last one, gather is not set*/

		src_desc[1] = ((uint32_t *)&lsrc_desc)[1];


		src_ring->per_transfer_context[write_index] = msdu;
		write_index = CE_RING_IDX_INCR(nentries_mask, write_index);

		if (sendhead)
			break;
		qdf_nbuf_set_next(msdu, NULL);
		msdu = tempnext;

	}


	src_ring->write_index = write_index;
	war_ce_src_ring_write_idx_set(scn, ctrl_addr, write_index);

	return hfreelist;
}

/**
 * ce_update_tx_ring() - Advance sw index.
 * @ce_tx_hdl : pointer to CE handle
 * @num_htt_cmpls : htt completions received.
 *
 * Function:
 * Increment the value of sw index of src ring
 * according to number of htt completions
 * received.
 *
 * Return: void
 */
#ifdef DATA_CE_SW_INDEX_NO_INLINE_UPDATE
void ce_update_tx_ring(struct CE_handle *ce_tx_hdl, uint32_t num_htt_cmpls)
{
	struct CE_state *ce_state = (struct CE_state *)ce_tx_hdl;
	struct CE_ring_state *src_ring = ce_state->src_ring;
	uint32_t nentries_mask = src_ring->nentries_mask;
	/*
	 * Advance the s/w index:
	 * This effectively simulates completing the CE ring descriptors
	 */
	src_ring->sw_index =
		CE_RING_IDX_ADD(nentries_mask, src_ring->sw_index,
				num_htt_cmpls);
}
#else
void ce_update_tx_ring(struct CE_handle *ce_tx_hdl, uint32_t num_htt_cmpls)
{}
#endif

/**
 * ce_send_single() - sends
 * @ce_tx_hdl : pointer to CE handle
 * @msdu : msdu to be sent
 * @transfer_id : transfer id
 * @len : Downloaded length
 *
 * Function:
 * 1. Send one msdu
 * 2. Increment write index of src ring accordinlgy.
 *
 * Return: int: CE sent status
 */
int ce_send_single(struct CE_handle *ce_tx_hdl, qdf_nbuf_t msdu,
		uint32_t transfer_id, u_int32_t len)
{
	struct CE_state *ce_state = (struct CE_state *)ce_tx_hdl;
	struct hif_softc *scn = ce_state->scn;
	struct CE_ring_state *src_ring = ce_state->src_ring;
	uint32_t ctrl_addr = ce_state->ctrl_addr;
	/*A_target_id_t targid = TARGID(scn);*/

	uint32_t nentries_mask = src_ring->nentries_mask;
	uint32_t sw_index, write_index;

	struct CE_src_desc *src_desc_base =
		(struct CE_src_desc *)src_ring->base_addr_owner_space;
	uint32_t *src_desc;

	struct CE_src_desc lsrc_desc = {0};

	DATA_CE_UPDATE_SWINDEX(src_ring->sw_index, scn, ctrl_addr);
	sw_index = src_ring->sw_index;
	write_index = src_ring->write_index;

	if (qdf_unlikely(CE_RING_DELTA(nentries_mask, write_index,
					sw_index-1) < 1)) {
		/* ol_tx_stats_inc_ring_error(sc->scn->pdev_txrx_handle, 1); */
		HIF_ERROR("%s: ce send fail %d %d %d", __func__, nentries_mask,
			  write_index, sw_index);
		return 1;
	}

	src_desc = (uint32_t *)CE_SRC_RING_TO_DESC(src_desc_base, write_index);

	src_desc[0] = qdf_nbuf_get_frag_paddr(msdu, 0);

	lsrc_desc.meta_data = transfer_id;
	lsrc_desc.nbytes = len;
	/*  Data packet is a byte stream, so disable byte swap */
	lsrc_desc.byte_swap = AH_NEED_TX_DATA_SWAP;
	lsrc_desc.gather    = 0; /* For the last one, gather is not set */

	src_desc[1] = ((uint32_t *)&lsrc_desc)[1];


	src_ring->per_transfer_context[write_index] = msdu;
	write_index = CE_RING_IDX_INCR(nentries_mask, write_index);

	src_ring->write_index = write_index;
	war_ce_src_ring_write_idx_set(scn, ctrl_addr, write_index);

	return QDF_STATUS_SUCCESS;
}

/**
 * ce_recv_buf_enqueue() - enqueue a recv buffer into a copy engine
 * @coyeng: copy engine handle
 * @per_recv_context: virtual address of the nbuf
 * @buffer: physical address of the nbuf
 *
 * Return: 0 if the buffer is enqueued
 */
int
ce_recv_buf_enqueue(struct CE_handle *copyeng,
		    void *per_recv_context, qdf_dma_addr_t buffer)
{
	struct CE_state *CE_state = (struct CE_state *)copyeng;
	struct HIF_CE_state *hif_state = HIF_GET_CE_STATE(CE_state->scn);

	return hif_state->ce_services->ce_recv_buf_enqueue(copyeng,
			per_recv_context, buffer);
}

/**
 * ce_recv_buf_enqueue_legacy() - enqueue a recv buffer into a copy engine
 * @coyeng: copy engine handle
 * @per_recv_context: virtual address of the nbuf
 * @buffer: physical address of the nbuf
 *
 * Return: 0 if the buffer is enqueued
 */
static int
ce_recv_buf_enqueue_legacy(struct CE_handle *copyeng,
		    void *per_recv_context, qdf_dma_addr_t buffer)
{
	int status;
	struct CE_state *CE_state = (struct CE_state *)copyeng;
	struct CE_ring_state *dest_ring = CE_state->dest_ring;
	uint32_t ctrl_addr = CE_state->ctrl_addr;
	unsigned int nentries_mask = dest_ring->nentries_mask;
	unsigned int write_index;
	unsigned int sw_index;
	uint64_t dma_addr = buffer;
	struct hif_softc *scn = CE_state->scn;

	qdf_spin_lock_bh(&CE_state->ce_index_lock);
	write_index = dest_ring->write_index;
	sw_index = dest_ring->sw_index;

	if (Q_TARGET_ACCESS_BEGIN(scn) < 0) {
		qdf_spin_unlock_bh(&CE_state->ce_index_lock);
		return -EIO;
	}

	if ((CE_RING_DELTA(nentries_mask, write_index, sw_index - 1) > 0) ||
	    (ce_is_fastpath_enabled(scn) && CE_state->htt_rx_data)) {
		struct CE_dest_desc *dest_ring_base =
			(struct CE_dest_desc *)dest_ring->base_addr_owner_space;
		struct CE_dest_desc *dest_desc =
			CE_DEST_RING_TO_DESC(dest_ring_base, write_index);

		/* Update low 32 bit destination descriptor */
		dest_desc->buffer_addr = (uint32_t)(dma_addr & 0xFFFFFFFF);
#ifdef QCA_WIFI_3_0
		dest_desc->buffer_addr_hi =
			(uint32_t)((dma_addr >> 32) & 0x1F);
#endif
		dest_desc->nbytes = 0;

		dest_ring->per_transfer_context[write_index] =
			per_recv_context;

		hif_record_ce_desc_event(scn, CE_state->id, HIF_RX_DESC_POST,
				(union ce_desc *) dest_desc, per_recv_context,
				write_index);

		/* Update Destination Ring Write Index */
		write_index = CE_RING_IDX_INCR(nentries_mask, write_index);
		if (write_index != sw_index) {
			CE_DEST_RING_WRITE_IDX_SET(scn, ctrl_addr, write_index);
			dest_ring->write_index = write_index;
		}
		status = QDF_STATUS_SUCCESS;
	} else
		status = QDF_STATUS_E_FAILURE;

	Q_TARGET_ACCESS_END(scn);
	qdf_spin_unlock_bh(&CE_state->ce_index_lock);
	return status;
}

void
ce_send_watermarks_set(struct CE_handle *copyeng,
		       unsigned int low_alert_nentries,
		       unsigned int high_alert_nentries)
{
	struct CE_state *CE_state = (struct CE_state *)copyeng;
	uint32_t ctrl_addr = CE_state->ctrl_addr;
	struct hif_softc *scn = CE_state->scn;

	CE_SRC_RING_LOWMARK_SET(scn, ctrl_addr, low_alert_nentries);
	CE_SRC_RING_HIGHMARK_SET(scn, ctrl_addr, high_alert_nentries);
}

void
ce_recv_watermarks_set(struct CE_handle *copyeng,
		       unsigned int low_alert_nentries,
		       unsigned int high_alert_nentries)
{
	struct CE_state *CE_state = (struct CE_state *)copyeng;
	uint32_t ctrl_addr = CE_state->ctrl_addr;
	struct hif_softc *scn = CE_state->scn;

	CE_DEST_RING_LOWMARK_SET(scn, ctrl_addr,
				low_alert_nentries);
	CE_DEST_RING_HIGHMARK_SET(scn, ctrl_addr,
				high_alert_nentries);
}

unsigned int ce_send_entries_avail(struct CE_handle *copyeng)
{
	struct CE_state *CE_state = (struct CE_state *)copyeng;
	struct CE_ring_state *src_ring = CE_state->src_ring;
	unsigned int nentries_mask = src_ring->nentries_mask;
	unsigned int sw_index;
	unsigned int write_index;

	qdf_spin_lock(&CE_state->ce_index_lock);
	sw_index = src_ring->sw_index;
	write_index = src_ring->write_index;
	qdf_spin_unlock(&CE_state->ce_index_lock);

	return CE_RING_DELTA(nentries_mask, write_index, sw_index - 1);
}

unsigned int ce_recv_entries_avail(struct CE_handle *copyeng)
{
	struct CE_state *CE_state = (struct CE_state *)copyeng;
	struct CE_ring_state *dest_ring = CE_state->dest_ring;
	unsigned int nentries_mask = dest_ring->nentries_mask;
	unsigned int sw_index;
	unsigned int write_index;

	qdf_spin_lock(&CE_state->ce_index_lock);
	sw_index = dest_ring->sw_index;
	write_index = dest_ring->write_index;
	qdf_spin_unlock(&CE_state->ce_index_lock);

	return CE_RING_DELTA(nentries_mask, write_index, sw_index - 1);
}

/*
 * Guts of ce_send_entries_done.
 * The caller takes responsibility for any necessary locking.
 */
static unsigned int
ce_send_entries_done_nolock_legacy(struct hif_softc *scn,
			    struct CE_state *CE_state)
{
	struct CE_ring_state *src_ring = CE_state->src_ring;
	uint32_t ctrl_addr = CE_state->ctrl_addr;
	unsigned int nentries_mask = src_ring->nentries_mask;
	unsigned int sw_index;
	unsigned int read_index;

	sw_index = src_ring->sw_index;
	read_index = CE_SRC_RING_READ_IDX_GET(scn, ctrl_addr);

	return CE_RING_DELTA(nentries_mask, sw_index, read_index);
}

unsigned int ce_send_entries_done(struct CE_handle *copyeng)
{
	struct CE_state *CE_state = (struct CE_state *)copyeng;
	unsigned int nentries;
	struct hif_softc *scn = CE_state->scn;
	struct HIF_CE_state *hif_state = HIF_GET_CE_STATE(scn);

	qdf_spin_lock(&CE_state->ce_index_lock);
	nentries = hif_state->ce_services->ce_send_entries_done_nolock(
						CE_state->scn, CE_state);
	qdf_spin_unlock(&CE_state->ce_index_lock);

	return nentries;
}

/*
 * Guts of ce_recv_entries_done.
 * The caller takes responsibility for any necessary locking.
 */
static unsigned int
ce_recv_entries_done_nolock_legacy(struct hif_softc *scn,
			    struct CE_state *CE_state)
{
	struct CE_ring_state *dest_ring = CE_state->dest_ring;
	uint32_t ctrl_addr = CE_state->ctrl_addr;
	unsigned int nentries_mask = dest_ring->nentries_mask;
	unsigned int sw_index;
	unsigned int read_index;

	sw_index = dest_ring->sw_index;
	read_index = CE_DEST_RING_READ_IDX_GET(scn, ctrl_addr);

	return CE_RING_DELTA(nentries_mask, sw_index, read_index);
}

unsigned int ce_recv_entries_done(struct CE_handle *copyeng)
{
	struct CE_state *CE_state = (struct CE_state *)copyeng;
	unsigned int nentries;
	struct hif_softc *scn = CE_state->scn;
	struct HIF_CE_state *hif_state = HIF_GET_CE_STATE(scn);

	qdf_spin_lock(&CE_state->ce_index_lock);
	nentries = hif_state->ce_services->ce_recv_entries_done_nolock(
						CE_state->scn, CE_state);
	qdf_spin_unlock(&CE_state->ce_index_lock);

	return nentries;
}

/*
 * Guts of ce_completed_recv_next.
 * The caller takes responsibility for any necessary locking.
 */
static int
ce_completed_recv_next_nolock_legacy(struct CE_state *CE_state,
			      void **per_CE_contextp,
			      void **per_transfer_contextp,
			      qdf_dma_addr_t *bufferp,
			      unsigned int *nbytesp,
			      unsigned int *transfer_idp,
			      unsigned int *flagsp)
{
	int status;
	struct CE_ring_state *dest_ring = CE_state->dest_ring;
	unsigned int nentries_mask = dest_ring->nentries_mask;
	unsigned int sw_index = dest_ring->sw_index;
	struct hif_softc *scn = CE_state->scn;
	struct CE_dest_desc *dest_ring_base =
		(struct CE_dest_desc *)dest_ring->base_addr_owner_space;
	struct CE_dest_desc *dest_desc =
		CE_DEST_RING_TO_DESC(dest_ring_base, sw_index);
	int nbytes;
	struct CE_dest_desc dest_desc_info;
	/*
	 * By copying the dest_desc_info element to local memory, we could
	 * avoid extra memory read from non-cachable memory.
	 */
	dest_desc_info =  *dest_desc;
	nbytes = dest_desc_info.nbytes;
	if (nbytes == 0) {
		/*
		 * This closes a relatively unusual race where the Host
		 * sees the updated DRRI before the update to the
		 * corresponding descriptor has completed. We treat this
		 * as a descriptor that is not yet done.
		 */
		status = QDF_STATUS_E_FAILURE;
		goto done;
	}

	hif_record_ce_desc_event(scn, CE_state->id, HIF_RX_DESC_COMPLETION,
			(union ce_desc *) dest_desc,
			dest_ring->per_transfer_context[sw_index],
			sw_index);

	dest_desc->nbytes = 0;

	/* Return data from completed destination descriptor */
	*bufferp = HIF_CE_DESC_ADDR_TO_DMA(&dest_desc_info);
	*nbytesp = nbytes;
	*transfer_idp = dest_desc_info.meta_data;
	*flagsp = (dest_desc_info.byte_swap) ? CE_RECV_FLAG_SWAPPED : 0;

	if (per_CE_contextp)
		*per_CE_contextp = CE_state->recv_context;

	if (per_transfer_contextp) {
		*per_transfer_contextp =
			dest_ring->per_transfer_context[sw_index];
	}
	dest_ring->per_transfer_context[sw_index] = 0;  /* sanity */

	/* Update sw_index */
	sw_index = CE_RING_IDX_INCR(nentries_mask, sw_index);
	dest_ring->sw_index = sw_index;
	status = QDF_STATUS_SUCCESS;

done:
	return status;
}

int
ce_completed_recv_next(struct CE_handle *copyeng,
		       void **per_CE_contextp,
		       void **per_transfer_contextp,
		       qdf_dma_addr_t *bufferp,
		       unsigned int *nbytesp,
		       unsigned int *transfer_idp, unsigned int *flagsp)
{
	struct CE_state *CE_state = (struct CE_state *)copyeng;
	int status;
	struct hif_softc *scn = CE_state->scn;
	struct HIF_CE_state *hif_state = HIF_GET_CE_STATE(scn);
	struct ce_ops *ce_services;

	ce_services = hif_state->ce_services;
	qdf_spin_lock_bh(&CE_state->ce_index_lock);
	status =
		ce_services->ce_completed_recv_next_nolock(CE_state,
				per_CE_contextp, per_transfer_contextp, bufferp,
					      nbytesp, transfer_idp, flagsp);
	qdf_spin_unlock_bh(&CE_state->ce_index_lock);

	return status;
}

QDF_STATUS
ce_revoke_recv_next(struct CE_handle *copyeng,
		    void **per_CE_contextp,
		    void **per_transfer_contextp, qdf_dma_addr_t *bufferp)
{
	struct CE_state *CE_state = (struct CE_state *)copyeng;
	struct HIF_CE_state *hif_state = HIF_GET_CE_STATE(CE_state->scn);

	return hif_state->ce_services->ce_revoke_recv_next(copyeng,
			per_CE_contextp, per_transfer_contextp, bufferp);
}
/* NB: Modeled after ce_completed_recv_next_nolock */
static QDF_STATUS
ce_revoke_recv_next_legacy(struct CE_handle *copyeng,
		    void **per_CE_contextp,
		    void **per_transfer_contextp, qdf_dma_addr_t *bufferp)
{
	struct CE_state *CE_state;
	struct CE_ring_state *dest_ring;
	unsigned int nentries_mask;
	unsigned int sw_index;
	unsigned int write_index;
	QDF_STATUS status;
	struct hif_softc *scn;

	CE_state = (struct CE_state *)copyeng;
	dest_ring = CE_state->dest_ring;
	if (!dest_ring)
		return QDF_STATUS_E_FAILURE;

	scn = CE_state->scn;
	qdf_spin_lock(&CE_state->ce_index_lock);
	nentries_mask = dest_ring->nentries_mask;
	sw_index = dest_ring->sw_index;
	write_index = dest_ring->write_index;
	if (write_index != sw_index) {
		struct CE_dest_desc *dest_ring_base =
			(struct CE_dest_desc *)dest_ring->
			    base_addr_owner_space;
		struct CE_dest_desc *dest_desc =
			CE_DEST_RING_TO_DESC(dest_ring_base, sw_index);

		/* Return data from completed destination descriptor */
		*bufferp = HIF_CE_DESC_ADDR_TO_DMA(dest_desc);

		if (per_CE_contextp)
			*per_CE_contextp = CE_state->recv_context;

		if (per_transfer_contextp) {
			*per_transfer_contextp =
				dest_ring->per_transfer_context[sw_index];
		}
		dest_ring->per_transfer_context[sw_index] = 0;  /* sanity */

		/* Update sw_index */
		sw_index = CE_RING_IDX_INCR(nentries_mask, sw_index);
		dest_ring->sw_index = sw_index;
		status = QDF_STATUS_SUCCESS;
	} else {
		status = QDF_STATUS_E_FAILURE;
	}
	qdf_spin_unlock(&CE_state->ce_index_lock);

	return status;
}

/*
 * Guts of ce_completed_send_next.
 * The caller takes responsibility for any necessary locking.
 */
static int
ce_completed_send_next_nolock_legacy(struct CE_state *CE_state,
			      void **per_CE_contextp,
			      void **per_transfer_contextp,
			      qdf_dma_addr_t *bufferp,
			      unsigned int *nbytesp,
			      unsigned int *transfer_idp,
			      unsigned int *sw_idx,
			      unsigned int *hw_idx,
			      uint32_t *toeplitz_hash_result)
{
	int status = QDF_STATUS_E_FAILURE;
	struct CE_ring_state *src_ring = CE_state->src_ring;
	uint32_t ctrl_addr = CE_state->ctrl_addr;
	unsigned int nentries_mask = src_ring->nentries_mask;
	unsigned int sw_index = src_ring->sw_index;
	unsigned int read_index;
	struct hif_softc *scn = CE_state->scn;

	if (src_ring->hw_index == sw_index) {
		/*
		 * The SW completion index has caught up with the cached
		 * version of the HW completion index.
		 * Update the cached HW completion index to see whether
		 * the SW has really caught up to the HW, or if the cached
		 * value of the HW index has become stale.
		 */
		if (Q_TARGET_ACCESS_BEGIN(scn) < 0)
			return QDF_STATUS_E_FAILURE;
		src_ring->hw_index =
			CE_SRC_RING_READ_IDX_GET_FROM_DDR(scn, ctrl_addr);
		if (Q_TARGET_ACCESS_END(scn) < 0)
			return QDF_STATUS_E_FAILURE;
	}
	read_index = src_ring->hw_index;

	if (sw_idx)
		*sw_idx = sw_index;

	if (hw_idx)
		*hw_idx = read_index;

	if ((read_index != sw_index) && (read_index != 0xffffffff)) {
		struct CE_src_desc *shadow_base =
			(struct CE_src_desc *)src_ring->shadow_base;
		struct CE_src_desc *shadow_src_desc =
			CE_SRC_RING_TO_DESC(shadow_base, sw_index);
#ifdef QCA_WIFI_3_0
		struct CE_src_desc *src_ring_base =
			(struct CE_src_desc *)src_ring->base_addr_owner_space;
		struct CE_src_desc *src_desc =
			CE_SRC_RING_TO_DESC(src_ring_base, sw_index);
#endif
		hif_record_ce_desc_event(scn, CE_state->id,
				HIF_TX_DESC_COMPLETION,
				(union ce_desc *) shadow_src_desc,
				src_ring->per_transfer_context[sw_index],
				sw_index);

		/* Return data from completed source descriptor */
		*bufferp = HIF_CE_DESC_ADDR_TO_DMA(shadow_src_desc);
		*nbytesp = shadow_src_desc->nbytes;
		*transfer_idp = shadow_src_desc->meta_data;
#ifdef QCA_WIFI_3_0
		*toeplitz_hash_result = src_desc->toeplitz_hash_result;
#else
		*toeplitz_hash_result = 0;
#endif
		if (per_CE_contextp)
			*per_CE_contextp = CE_state->send_context;

		if (per_transfer_contextp) {
			*per_transfer_contextp =
				src_ring->per_transfer_context[sw_index];
		}
		src_ring->per_transfer_context[sw_index] = 0;   /* sanity */

		/* Update sw_index */
		sw_index = CE_RING_IDX_INCR(nentries_mask, sw_index);
		src_ring->sw_index = sw_index;
		status = QDF_STATUS_SUCCESS;
	}

	return status;
}

QDF_STATUS
ce_cancel_send_next(struct CE_handle *copyeng,
		void **per_CE_contextp,
		void **per_transfer_contextp,
		qdf_dma_addr_t *bufferp,
		unsigned int *nbytesp,
		unsigned int *transfer_idp,
		uint32_t *toeplitz_hash_result)
{
	struct CE_state *CE_state = (struct CE_state *)copyeng;
	struct HIF_CE_state *hif_state = HIF_GET_CE_STATE(CE_state->scn);

	return hif_state->ce_services->ce_cancel_send_next
		(copyeng, per_CE_contextp, per_transfer_contextp,
		 bufferp, nbytesp, transfer_idp, toeplitz_hash_result);
}

/* NB: Modeled after ce_completed_send_next */
static QDF_STATUS
ce_cancel_send_next_legacy(struct CE_handle *copyeng,
		void **per_CE_contextp,
		void **per_transfer_contextp,
		qdf_dma_addr_t *bufferp,
		unsigned int *nbytesp,
		unsigned int *transfer_idp,
		uint32_t *toeplitz_hash_result)
{
	struct CE_state *CE_state;
	struct CE_ring_state *src_ring;
	unsigned int nentries_mask;
	unsigned int sw_index;
	unsigned int write_index;
	QDF_STATUS status;
	struct hif_softc *scn;

	CE_state = (struct CE_state *)copyeng;
	src_ring = CE_state->src_ring;
	if (!src_ring)
		return QDF_STATUS_E_FAILURE;

	scn = CE_state->scn;
	qdf_spin_lock(&CE_state->ce_index_lock);
	nentries_mask = src_ring->nentries_mask;
	sw_index = src_ring->sw_index;
	write_index = src_ring->write_index;

	if (write_index != sw_index) {
		struct CE_src_desc *src_ring_base =
			(struct CE_src_desc *)src_ring->base_addr_owner_space;
		struct CE_src_desc *src_desc =
			CE_SRC_RING_TO_DESC(src_ring_base, sw_index);

		/* Return data from completed source descriptor */
		*bufferp = HIF_CE_DESC_ADDR_TO_DMA(src_desc);
		*nbytesp = src_desc->nbytes;
		*transfer_idp = src_desc->meta_data;
#ifdef QCA_WIFI_3_0
		*toeplitz_hash_result = src_desc->toeplitz_hash_result;
#else
		*toeplitz_hash_result = 0;
#endif

		if (per_CE_contextp)
			*per_CE_contextp = CE_state->send_context;

		if (per_transfer_contextp) {
			*per_transfer_contextp =
				src_ring->per_transfer_context[sw_index];
		}
		src_ring->per_transfer_context[sw_index] = 0;   /* sanity */

		/* Update sw_index */
		sw_index = CE_RING_IDX_INCR(nentries_mask, sw_index);
		src_ring->sw_index = sw_index;
		status = QDF_STATUS_SUCCESS;
	} else {
		status = QDF_STATUS_E_FAILURE;
	}
	qdf_spin_unlock(&CE_state->ce_index_lock);

	return status;
}

/* Shift bits to convert IS_*_RING_*_WATERMARK_MASK to CE_WM_FLAG_*_* */
#define CE_WM_SHFT 1

int
ce_completed_send_next(struct CE_handle *copyeng,
		       void **per_CE_contextp,
		       void **per_transfer_contextp,
		       qdf_dma_addr_t *bufferp,
		       unsigned int *nbytesp,
		       unsigned int *transfer_idp,
		       unsigned int *sw_idx,
		       unsigned int *hw_idx,
		       unsigned int *toeplitz_hash_result)
{
	struct CE_state *CE_state = (struct CE_state *)copyeng;
	struct hif_softc *scn = CE_state->scn;
	struct HIF_CE_state *hif_state = HIF_GET_CE_STATE(scn);
	struct ce_ops *ce_services;
	int status;

	ce_services = hif_state->ce_services;
	qdf_spin_lock_bh(&CE_state->ce_index_lock);
	status =
		ce_services->ce_completed_send_next_nolock(CE_state,
					per_CE_contextp, per_transfer_contextp,
					bufferp, nbytesp, transfer_idp, sw_idx,
					      hw_idx, toeplitz_hash_result);
	qdf_spin_unlock_bh(&CE_state->ce_index_lock);

	return status;
}

#ifdef ATH_11AC_TXCOMPACT
/* CE engine descriptor reap
 * Similar to ce_per_engine_service , Only difference is ce_per_engine_service
 * does recieve and reaping of completed descriptor ,
 * This function only handles reaping of Tx complete descriptor.
 * The Function is called from threshold reap  poll routine
 * hif_send_complete_check so should not countain recieve functionality
 * within it .
 */

void ce_per_engine_servicereap(struct hif_softc *scn, unsigned int ce_id)
{
	void *CE_context;
	void *transfer_context;
	qdf_dma_addr_t buf;
	unsigned int nbytes;
	unsigned int id;
	unsigned int sw_idx, hw_idx;
	uint32_t toeplitz_hash_result;
	struct CE_state *CE_state = scn->ce_id_to_state[ce_id];
	struct HIF_CE_state *hif_state = HIF_GET_CE_STATE(scn);

	if (Q_TARGET_ACCESS_BEGIN(scn) < 0)
		return;

	hif_record_ce_desc_event(scn, ce_id, HIF_CE_REAP_ENTRY,
			NULL, NULL, 0);

	/* Since this function is called from both user context and
	 * tasklet context the spinlock has to lock the bottom halves.
	 * This fix assumes that ATH_11AC_TXCOMPACT flag is always
	 * enabled in TX polling mode. If this is not the case, more
	 * bottom halve spin lock changes are needed. Due to data path
	 * performance concern, after internal discussion we've decided
	 * to make minimum change, i.e., only address the issue occured
	 * in this function. The possible negative effect of this minimum
	 * change is that, in the future, if some other function will also
	 * be opened to let the user context to use, those cases need to be
	 * addressed by change spin_lock to spin_lock_bh also.
	 */

	qdf_spin_lock_bh(&CE_state->ce_index_lock);

	if (CE_state->send_cb) {
		{
			struct ce_ops *ce_services = hif_state->ce_services;
			/* Pop completed send buffers and call the
			 * registered send callback for each
			 */
			while (ce_services->ce_completed_send_next_nolock
				 (CE_state, &CE_context,
				  &transfer_context, &buf,
				  &nbytes, &id, &sw_idx, &hw_idx,
				  &toeplitz_hash_result) ==
				  QDF_STATUS_SUCCESS) {
				if (ce_id != CE_HTT_H2T_MSG) {
					qdf_spin_unlock_bh(
						&CE_state->ce_index_lock);
					CE_state->send_cb(
						(struct CE_handle *)
						CE_state, CE_context,
						transfer_context, buf,
						nbytes, id, sw_idx, hw_idx,
						toeplitz_hash_result);
					qdf_spin_lock_bh(
						&CE_state->ce_index_lock);
				} else {
					struct HIF_CE_pipe_info *pipe_info =
						(struct HIF_CE_pipe_info *)
						CE_context;

					qdf_spin_lock_bh(&pipe_info->
						 completion_freeq_lock);
					pipe_info->num_sends_allowed++;
					qdf_spin_unlock_bh(&pipe_info->
						   completion_freeq_lock);
				}
			}
		}
	}

	qdf_spin_unlock_bh(&CE_state->ce_index_lock);

	hif_record_ce_desc_event(scn, ce_id, HIF_CE_REAP_EXIT,
			NULL, NULL, 0);
	Q_TARGET_ACCESS_END(scn);
}

#endif /*ATH_11AC_TXCOMPACT */

/*
 * Number of times to check for any pending tx/rx completion on
 * a copy engine, this count should be big enough. Once we hit
 * this threashold we'll not check for any Tx/Rx comlpetion in same
 * interrupt handling. Note that this threashold is only used for
 * Rx interrupt processing, this can be used tor Tx as well if we
 * suspect any infinite loop in checking for pending Tx completion.
 */
#define CE_TXRX_COMP_CHECK_THRESHOLD 20

#ifdef WLAN_FEATURE_FASTPATH
/**
 * ce_fastpath_rx_handle() - Updates write_index and calls fastpath msg handler
 * @ce_state: handle to copy engine state
 * @cmpl_msdus: Rx msdus
 * @num_cmpls: number of Rx msdus
 * @ctrl_addr: CE control address
 *
 * Return: None
 */
static void ce_fastpath_rx_handle(struct CE_state *ce_state,
				  qdf_nbuf_t *cmpl_msdus, uint32_t num_cmpls,
				  uint32_t ctrl_addr)
{
	struct hif_softc *scn = ce_state->scn;
	struct CE_ring_state *dest_ring = ce_state->dest_ring;
	uint32_t nentries_mask = dest_ring->nentries_mask;
	uint32_t write_index;

	qdf_spin_unlock(&ce_state->ce_index_lock);
	(ce_state->fastpath_handler)(ce_state->context,	cmpl_msdus, num_cmpls);
	qdf_spin_lock(&ce_state->ce_index_lock);

	/* Update Destination Ring Write Index */
	write_index = dest_ring->write_index;
	write_index = CE_RING_IDX_ADD(nentries_mask, write_index, num_cmpls);

	hif_record_ce_desc_event(scn, ce_state->id,
			FAST_RX_WRITE_INDEX_UPDATE,
			NULL, NULL, write_index);

	CE_DEST_RING_WRITE_IDX_SET(scn, ctrl_addr, write_index);
	dest_ring->write_index = write_index;
}

#define MSG_FLUSH_NUM 32
/**
 * ce_per_engine_service_fast() - CE handler routine to service fastpath msgs
 * @scn: hif_context
 * @ce_id: Copy engine ID
 * 1) Go through the CE ring, and find the completions
 * 2) For valid completions retrieve context (nbuf) for per_transfer_context[]
 * 3) Unmap buffer & accumulate in an array.
 * 4) Call message handler when array is full or when exiting the handler
 *
 * Return: void
 */

static void ce_per_engine_service_fast(struct hif_softc *scn, int ce_id)
{
	struct CE_state *ce_state = scn->ce_id_to_state[ce_id];
	struct hif_opaque_softc *hif_hdl = GET_HIF_OPAQUE_HDL(scn);
	struct CE_ring_state *dest_ring = ce_state->dest_ring;
	struct CE_dest_desc *dest_ring_base =
		(struct CE_dest_desc *)dest_ring->base_addr_owner_space;

	uint32_t nentries_mask = dest_ring->nentries_mask;
	uint32_t sw_index = dest_ring->sw_index;
	uint32_t nbytes;
	qdf_nbuf_t nbuf;
	dma_addr_t paddr;
	struct CE_dest_desc *dest_desc;
	qdf_nbuf_t cmpl_msdus[MSG_FLUSH_NUM];
	uint32_t ctrl_addr = ce_state->ctrl_addr;
	uint32_t nbuf_cmpl_idx = 0;
	unsigned int more_comp_cnt = 0;

more_data:
	for (;;) {

		dest_desc = CE_DEST_RING_TO_DESC(dest_ring_base,
						 sw_index);

		/*
		 * The following 2 reads are from non-cached memory
		 */
		nbytes = dest_desc->nbytes;

		/* If completion is invalid, break */
		if (qdf_unlikely(nbytes == 0))
			break;


		/*
		 * Build the nbuf list from valid completions
		 */
		nbuf = dest_ring->per_transfer_context[sw_index];

		/*
		 * No lock is needed here, since this is the only thread
		 * that accesses the sw_index
		 */
		sw_index = CE_RING_IDX_INCR(nentries_mask, sw_index);

		/*
		 * CAREFUL : Uncached write, but still less expensive,
		 * since most modern caches use "write-combining" to
		 * flush multiple cache-writes all at once.
		 */
		dest_desc->nbytes = 0;

		/*
		 * Per our understanding this is not required on our
		 * since we are doing the same cache invalidation
		 * operation on the same buffer twice in succession,
		 * without any modifiication to this buffer by CPU in
		 * between.
		 * However, this code with 2 syncs in succession has
		 * been undergoing some testing at a customer site,
		 * and seemed to be showing no problems so far. Would
		 * like to validate from the customer, that this line
		 * is really not required, before we remove this line
		 * completely.
		 */
		paddr = QDF_NBUF_CB_PADDR(nbuf);

		qdf_mem_dma_sync_single_for_cpu(scn->qdf_dev, paddr,
				(skb_end_pointer(nbuf) - (nbuf)->data),
				DMA_FROM_DEVICE);

		qdf_nbuf_put_tail(nbuf, nbytes);

		qdf_assert_always(nbuf->data != NULL);

		QDF_NBUF_CB_RX_CTX_ID(nbuf) =
				hif_get_rx_ctx_id(ce_state->id, hif_hdl);
		cmpl_msdus[nbuf_cmpl_idx++] = nbuf;

		/*
		 * we are not posting the buffers back instead
		 * reusing the buffers
		 */
		if (nbuf_cmpl_idx == MSG_FLUSH_NUM) {
			hif_record_ce_desc_event(scn, ce_state->id,
						 FAST_RX_SOFTWARE_INDEX_UPDATE,
						 NULL, NULL, sw_index);
			dest_ring->sw_index = sw_index;
			ce_fastpath_rx_handle(ce_state, cmpl_msdus,
					      MSG_FLUSH_NUM, ctrl_addr);

			ce_state->receive_count += MSG_FLUSH_NUM;
			if (qdf_unlikely(hif_ce_service_should_yield(
						scn, ce_state))) {
				ce_state->force_break = 1;
				qdf_atomic_set(&ce_state->rx_pending, 1);
				return;
			}

			nbuf_cmpl_idx = 0;
			more_comp_cnt = 0;
		}
	}

	hif_record_ce_desc_event(scn, ce_state->id,
				 FAST_RX_SOFTWARE_INDEX_UPDATE,
				 NULL, NULL, sw_index);

	dest_ring->sw_index = sw_index;

	/*
	 * If there are not enough completions to fill the array,
	 * just call the message handler here
	 */
	if (nbuf_cmpl_idx) {
		ce_fastpath_rx_handle(ce_state, cmpl_msdus,
				      nbuf_cmpl_idx, ctrl_addr);

		ce_state->receive_count += nbuf_cmpl_idx;
		if (qdf_unlikely(hif_ce_service_should_yield(scn, ce_state))) {
			ce_state->force_break = 1;
			qdf_atomic_set(&ce_state->rx_pending, 1);
			return;
		}

		/* check for more packets after upper layer processing */
		nbuf_cmpl_idx = 0;
		more_comp_cnt = 0;
		goto more_data;
	}
	qdf_atomic_set(&ce_state->rx_pending, 0);
	CE_ENGINE_INT_STATUS_CLEAR(scn, ctrl_addr,
				   HOST_IS_COPY_COMPLETE_MASK);

	if (ce_recv_entries_done_nolock_legacy(scn, ce_state)) {
		if (more_comp_cnt++ < CE_TXRX_COMP_CHECK_THRESHOLD) {
			goto more_data;
		} else {
			HIF_ERROR("%s:Potential infinite loop detected during Rx processing nentries_mask:0x%x sw read_idx:0x%x hw read_idx:0x%x",
				  __func__, nentries_mask,
				  ce_state->dest_ring->sw_index,
				  CE_DEST_RING_READ_IDX_GET(scn, ctrl_addr));
		}
	}
#ifdef NAPI_YIELD_BUDGET_BASED
	/* Caution : Before you modify this code, please refer hif_napi_poll function
	to understand how napi_complete gets called and make the necessary changes
	Force break has to be done till WIN disables the interrupt at source */
	ce_state->force_break = 1;
#endif
}

#else
static void ce_per_engine_service_fast(struct hif_softc *scn, int ce_id)
{
}
#endif /* WLAN_FEATURE_FASTPATH */

/* Maximum amount of time in nano seconds before which the CE per engine service
 * should yield. ~1 jiffie.
 */
#define CE_PER_ENGINE_SERVICE_MAX_YIELD_TIME_NS (10 * 1000 * 1000)

/*
 * Guts of interrupt handler for per-engine interrupts on a particular CE.
 *
 * Invokes registered callbacks for recv_complete,
 * send_complete, and watermarks.
 *
 * Returns: number of messages processed
 */
int ce_per_engine_service(struct hif_softc *scn, unsigned int CE_id)
{
	struct CE_state *CE_state = scn->ce_id_to_state[CE_id];
	uint32_t ctrl_addr = CE_state->ctrl_addr;
	struct HIF_CE_state *hif_state = HIF_GET_CE_STATE(scn);
	void *CE_context;
	void *transfer_context;
	qdf_dma_addr_t buf;
	unsigned int nbytes;
	unsigned int id;
	unsigned int flags;
	unsigned int more_comp_cnt = 0;
	unsigned int more_snd_comp_cnt = 0;
	unsigned int sw_idx, hw_idx;
	uint32_t toeplitz_hash_result;
	uint32_t mode = hif_get_conparam(scn);

	if (hif_is_nss_wifi_enabled(scn) && (CE_state->htt_rx_data))
		return CE_state->receive_count;

	if (Q_TARGET_ACCESS_BEGIN(scn) < 0) {
		HIF_ERROR("[premature rc=0]");
		return 0; /* no work done */
	}

	/* Clear force_break flag and re-initialize receive_count to 0 */
	CE_state->receive_count = 0;
	CE_state->force_break = 0;
	CE_state->ce_service_yield_time =
		sched_clock() +
		(unsigned long long)CE_PER_ENGINE_SERVICE_MAX_YIELD_TIME_NS;


	qdf_spin_lock(&CE_state->ce_index_lock);
	/*
	 * With below check we make sure CE we are handling is datapath CE and
	 * fastpath is enabled.
	 */
	if (ce_is_fastpath_handler_registered(CE_state)) {
		/* For datapath only Rx CEs */
		ce_per_engine_service_fast(scn, CE_id);
		goto unlock_end;
	}

more_completions:
	if (CE_state->recv_cb) {

		/* Pop completed recv buffers and call
		 * the registered recv callback for each
		 */
		while (hif_state->ce_services->ce_completed_recv_next_nolock
				(CE_state, &CE_context, &transfer_context,
				&buf, &nbytes, &id, &flags) ==
				QDF_STATUS_SUCCESS) {
			qdf_spin_unlock(&CE_state->ce_index_lock);
			CE_state->recv_cb((struct CE_handle *)CE_state,
					  CE_context, transfer_context, buf,
					  nbytes, id, flags);

			/*
			 * EV #112693 -
			 * [Peregrine][ES1][WB342][Win8x86][Performance]
			 * BSoD_0x133 occurred in VHT80 UDP_DL
			 * Break out DPC by force if number of loops in
			 * hif_pci_ce_recv_data reaches MAX_NUM_OF_RECEIVES
			 * to avoid spending too long time in
			 * DPC for each interrupt handling. Schedule another
			 * DPC to avoid data loss if we had taken
			 * force-break action before apply to Windows OS
			 * only currently, Linux/MAC os can expand to their
			 * platform if necessary
			 */

			/* Break the receive processes by
			 * force if force_break set up
			 */
			if (qdf_unlikely(CE_state->force_break)) {
				qdf_atomic_set(&CE_state->rx_pending, 1);
				goto target_access_end;
			}
			qdf_spin_lock(&CE_state->ce_index_lock);
		}
	}

	/*
	 * Attention: We may experience potential infinite loop for below
	 * While Loop during Sending Stress test.
	 * Resolve the same way as Receive Case (Refer to EV #112693)
	 */

	if (CE_state->send_cb) {
		/* Pop completed send buffers and call
		 * the registered send callback for each
		 */

#ifdef ATH_11AC_TXCOMPACT
		while (hif_state->ce_services->ce_completed_send_next_nolock
			 (CE_state, &CE_context,
			 &transfer_context, &buf, &nbytes,
			 &id, &sw_idx, &hw_idx,
			 &toeplitz_hash_result) == QDF_STATUS_SUCCESS) {

			if (CE_id != CE_HTT_H2T_MSG ||
			    QDF_IS_EPPING_ENABLED(mode)) {
				qdf_spin_unlock(&CE_state->ce_index_lock);
				CE_state->send_cb((struct CE_handle *)CE_state,
						  CE_context, transfer_context,
						  buf, nbytes, id, sw_idx,
						  hw_idx, toeplitz_hash_result);
				qdf_spin_lock(&CE_state->ce_index_lock);
			} else {
				struct HIF_CE_pipe_info *pipe_info =
					(struct HIF_CE_pipe_info *)CE_context;

				qdf_spin_lock(&pipe_info->
					      completion_freeq_lock);
				pipe_info->num_sends_allowed++;
				qdf_spin_unlock(&pipe_info->
						completion_freeq_lock);
			}
		}
#else                           /*ATH_11AC_TXCOMPACT */
		while (hif_state->ce_services->ce_completed_send_next_nolock
			 (CE_state, &CE_context,
			  &transfer_context, &buf, &nbytes,
			  &id, &sw_idx, &hw_idx,
			  &toeplitz_hash_result) == QDF_STATUS_SUCCESS) {
			qdf_spin_unlock(&CE_state->ce_index_lock);
			CE_state->send_cb((struct CE_handle *)CE_state,
				  CE_context, transfer_context, buf,
				  nbytes, id, sw_idx, hw_idx,
				  toeplitz_hash_result);
			qdf_spin_lock(&CE_state->ce_index_lock);
		}
#endif /*ATH_11AC_TXCOMPACT */
	}

more_watermarks:
	if (CE_state->misc_cbs) {
		if (CE_state->watermark_cb &&
				hif_state->ce_services->watermark_int(CE_state,
					&flags)) {
			qdf_spin_unlock(&CE_state->ce_index_lock);
			/* Convert HW IS bits to software flags */
			CE_state->watermark_cb((struct CE_handle *)CE_state,
					CE_state->wm_context, flags);
			qdf_spin_lock(&CE_state->ce_index_lock);
		}
	}

	/*
	 * Clear the misc interrupts (watermark) that were handled above,
	 * and that will be checked again below.
	 * Clear and check for copy-complete interrupts again, just in case
	 * more copy completions happened while the misc interrupts were being
	 * handled.
	 */
	if (!ce_srng_based(scn))
		CE_ENGINE_INT_STATUS_CLEAR(scn, ctrl_addr,
				   CE_WATERMARK_MASK |
				   HOST_IS_COPY_COMPLETE_MASK);

	/*
	 * Now that per-engine interrupts are cleared, verify that
	 * no recv interrupts arrive while processing send interrupts,
	 * and no recv or send interrupts happened while processing
	 * misc interrupts.Go back and check again.Keep checking until
	 * we find no more events to process.
	 */
	if (CE_state->recv_cb &&
		hif_state->ce_services->ce_recv_entries_done_nolock(scn,
				CE_state)) {
		if (QDF_IS_EPPING_ENABLED(mode) ||
		    more_comp_cnt++ < CE_TXRX_COMP_CHECK_THRESHOLD) {
			goto more_completions;
		} else {
			HIF_ERROR(
				"%s:Potential infinite loop detected during Rx processing nentries_mask:0x%x sw read_idx:0x%x hw read_idx:0x%x",
				__func__, CE_state->dest_ring->nentries_mask,
				CE_state->dest_ring->sw_index,
				CE_DEST_RING_READ_IDX_GET(scn,
							  CE_state->ctrl_addr));
		}
	}

	if (CE_state->send_cb &&
		hif_state->ce_services->ce_send_entries_done_nolock(scn,
				CE_state)) {
		if (QDF_IS_EPPING_ENABLED(mode) ||
		    more_snd_comp_cnt++ < CE_TXRX_COMP_CHECK_THRESHOLD) {
			goto more_completions;
		} else {
			HIF_ERROR(
				"%s:Potential infinite loop detected during send completion nentries_mask:0x%x sw read_idx:0x%x hw read_idx:0x%x",
				__func__, CE_state->src_ring->nentries_mask,
				CE_state->src_ring->sw_index,
				CE_SRC_RING_READ_IDX_GET(scn,
							 CE_state->ctrl_addr));
		}
	}

	if (CE_state->misc_cbs && CE_state->watermark_cb) {
		if (hif_state->ce_services->watermark_int(CE_state, &flags))
			goto more_watermarks;
	}

	qdf_atomic_set(&CE_state->rx_pending, 0);

unlock_end:
	qdf_spin_unlock(&CE_state->ce_index_lock);
target_access_end:
	if (Q_TARGET_ACCESS_END(scn) < 0)
		HIF_ERROR("<--[premature rc=%d]", CE_state->receive_count);
	return CE_state->receive_count;
}

/*
 * Handler for per-engine interrupts on ALL active CEs.
 * This is used in cases where the system is sharing a
 * single interrput for all CEs
 */

void ce_per_engine_service_any(int irq, struct hif_softc *scn)
{
	int CE_id;
	uint32_t intr_summary;

	if (Q_TARGET_ACCESS_BEGIN(scn) < 0)
		return;

	if (!qdf_atomic_read(&scn->tasklet_from_intr)) {
		for (CE_id = 0; CE_id < scn->ce_count; CE_id++) {
			struct CE_state *CE_state = scn->ce_id_to_state[CE_id];

			if (qdf_atomic_read(&CE_state->rx_pending)) {
				qdf_atomic_set(&CE_state->rx_pending, 0);
				ce_per_engine_service(scn, CE_id);
			}
		}

		Q_TARGET_ACCESS_END(scn);
		return;
	}

	intr_summary = CE_INTERRUPT_SUMMARY(scn);

	for (CE_id = 0; intr_summary && (CE_id < scn->ce_count); CE_id++) {
		if (intr_summary & (1 << CE_id))
			intr_summary &= ~(1 << CE_id);
		else
			continue;       /* no intr pending on this CE */

		ce_per_engine_service(scn, CE_id);
	}

	Q_TARGET_ACCESS_END(scn);
}

/*
 * Adjust interrupts for the copy complete handler.
 * If it's needed for either send or recv, then unmask
 * this interrupt; otherwise, mask it.
 *
 * Called with target_lock held.
 */
static void
ce_per_engine_handler_adjust_legacy(struct CE_state *CE_state,
			     int disable_copy_compl_intr)
{
	uint32_t ctrl_addr = CE_state->ctrl_addr;
	struct hif_softc *scn = CE_state->scn;

	CE_state->disable_copy_compl_intr = disable_copy_compl_intr;

	if (Q_TARGET_ACCESS_BEGIN(scn) < 0)
		return;

	if ((!disable_copy_compl_intr) &&
	    (CE_state->send_cb || CE_state->recv_cb))
		CE_COPY_COMPLETE_INTR_ENABLE(scn, ctrl_addr);
	else
		CE_COPY_COMPLETE_INTR_DISABLE(scn, ctrl_addr);

	if (CE_state->watermark_cb)
		CE_WATERMARK_INTR_ENABLE(scn, ctrl_addr);
	 else
		CE_WATERMARK_INTR_DISABLE(scn, ctrl_addr);
	Q_TARGET_ACCESS_END(scn);
}

/*Iterate the CE_state list and disable the compl interrupt
 * if it has been registered already.
 */
void ce_disable_any_copy_compl_intr_nolock(struct hif_softc *scn)
{
	int CE_id;

	if (Q_TARGET_ACCESS_BEGIN(scn) < 0)
		return;

	for (CE_id = 0; CE_id < scn->ce_count; CE_id++) {
		struct CE_state *CE_state = scn->ce_id_to_state[CE_id];
		uint32_t ctrl_addr = CE_state->ctrl_addr;

		/* if the interrupt is currently enabled, disable it */
		if (!CE_state->disable_copy_compl_intr
		    && (CE_state->send_cb || CE_state->recv_cb))
			CE_COPY_COMPLETE_INTR_DISABLE(scn, ctrl_addr);

		if (CE_state->watermark_cb)
			CE_WATERMARK_INTR_DISABLE(scn, ctrl_addr);
	}
	Q_TARGET_ACCESS_END(scn);
}

void ce_enable_any_copy_compl_intr_nolock(struct hif_softc *scn)
{
	int CE_id;

	if (Q_TARGET_ACCESS_BEGIN(scn) < 0)
		return;

	for (CE_id = 0; CE_id < scn->ce_count; CE_id++) {
		struct CE_state *CE_state = scn->ce_id_to_state[CE_id];
		uint32_t ctrl_addr = CE_state->ctrl_addr;

		/*
		 * If the CE is supposed to have copy complete interrupts
		 * enabled (i.e. there a callback registered, and the
		 * "disable" flag is not set), then re-enable the interrupt.
		 */
		if (!CE_state->disable_copy_compl_intr
		    && (CE_state->send_cb || CE_state->recv_cb))
			CE_COPY_COMPLETE_INTR_ENABLE(scn, ctrl_addr);

		if (CE_state->watermark_cb)
			CE_WATERMARK_INTR_ENABLE(scn, ctrl_addr);
	}
	Q_TARGET_ACCESS_END(scn);
}

/**
 * ce_send_cb_register(): register completion handler
 * @copyeng: CE_state representing the ce we are adding the behavior to
 * @fn_ptr: callback that the ce should use when processing tx completions
 * @disable_interrupts: if the interupts should be enabled or not.
 *
 * Caller should guarantee that no transactions are in progress before
 * switching the callback function.
 *
 * Registers the send context before the fn pointer so that if the cb is valid
 * the context should be valid.
 *
 * Beware that currently this function will enable completion interrupts.
 */
void
ce_send_cb_register(struct CE_handle *copyeng,
		    ce_send_cb fn_ptr,
		    void *ce_send_context, int disable_interrupts)
{
	struct CE_state *CE_state = (struct CE_state *)copyeng;
	struct hif_softc *scn;
	struct HIF_CE_state *hif_state;

	if (CE_state == NULL) {
		HIF_ERROR("%s: Error CE state = NULL", __func__);
		return;
	}
	scn = CE_state->scn;
	hif_state = HIF_GET_CE_STATE(scn);
	if (hif_state == NULL) {
		HIF_ERROR("%s: Error HIF state = NULL", __func__);
		return;
	}
	CE_state->send_context = ce_send_context;
	CE_state->send_cb = fn_ptr;
	hif_state->ce_services->ce_per_engine_handler_adjust(CE_state,
							disable_interrupts);
}

/**
 * ce_recv_cb_register(): register completion handler
 * @copyeng: CE_state representing the ce we are adding the behavior to
 * @fn_ptr: callback that the ce should use when processing rx completions
 * @disable_interrupts: if the interupts should be enabled or not.
 *
 * Registers the send context before the fn pointer so that if the cb is valid
 * the context should be valid.
 *
 * Caller should guarantee that no transactions are in progress before
 * switching the callback function.
 */
void
ce_recv_cb_register(struct CE_handle *copyeng,
		    CE_recv_cb fn_ptr,
		    void *CE_recv_context, int disable_interrupts)
{
	struct CE_state *CE_state = (struct CE_state *)copyeng;
	struct hif_softc *scn;
	struct HIF_CE_state *hif_state;

	if (CE_state == NULL) {
		HIF_ERROR("%s: ERROR CE state = NULL", __func__);
		return;
	}
	scn = CE_state->scn;
	hif_state = HIF_GET_CE_STATE(scn);
	if (hif_state == NULL) {
		HIF_ERROR("%s: Error HIF state = NULL", __func__);
		return;
	}
	CE_state->recv_context = CE_recv_context;
	CE_state->recv_cb = fn_ptr;
	hif_state->ce_services->ce_per_engine_handler_adjust(CE_state,
							disable_interrupts);
}

/**
 * ce_watermark_cb_register(): register completion handler
 * @copyeng: CE_state representing the ce we are adding the behavior to
 * @fn_ptr: callback that the ce should use when processing watermark events
 *
 * Caller should guarantee that no watermark events are being processed before
 * switching the callback function.
 */
void
ce_watermark_cb_register(struct CE_handle *copyeng,
			 CE_watermark_cb fn_ptr, void *CE_wm_context)
{
	struct CE_state *CE_state = (struct CE_state *)copyeng;
	struct hif_softc *scn = CE_state->scn;
	struct HIF_CE_state *hif_state = HIF_GET_CE_STATE(scn);

	CE_state->watermark_cb = fn_ptr;
	CE_state->wm_context = CE_wm_context;
	hif_state->ce_services->ce_per_engine_handler_adjust(CE_state,
							0);
	if (fn_ptr)
		CE_state->misc_cbs = 1;
}

bool ce_get_rx_pending(struct hif_softc *scn)
{
	int CE_id;

	for (CE_id = 0; CE_id < scn->ce_count; CE_id++) {
		struct CE_state *CE_state = scn->ce_id_to_state[CE_id];

		if (qdf_atomic_read(&CE_state->rx_pending))
			return true;
	}

	return false;
}

/**
 * ce_check_rx_pending() - ce_check_rx_pending
 * @CE_state: context of the copy engine to check
 *
 * Return: true if there per_engine_service
 *	didn't process all the rx descriptors.
 */
bool ce_check_rx_pending(struct CE_state *CE_state)
{
	if (qdf_atomic_read(&CE_state->rx_pending))
		return true;
	else
		return false;
}

#ifdef IPA_OFFLOAD
/**
 * ce_ipa_get_resource() - get uc resource on copyengine
 * @ce: copyengine context
 * @ce_sr_base_paddr: copyengine source ring base physical address
 * @ce_sr_ring_size: copyengine source ring size
 * @ce_reg_paddr: copyengine register physical address
 *
 * Copy engine should release resource to micro controller
 * Micro controller needs
 *  - Copy engine source descriptor base address
 *  - Copy engine source descriptor size
 *  - PCI BAR address to access copy engine regiser
 *
 * Return: None
 */
void ce_ipa_get_resource(struct CE_handle *ce,
			 qdf_dma_addr_t *ce_sr_base_paddr,
			 uint32_t *ce_sr_ring_size,
			 qdf_dma_addr_t *ce_reg_paddr)
{
	struct CE_state *CE_state = (struct CE_state *)ce;
	uint32_t ring_loop;
	struct CE_src_desc *ce_desc;
	qdf_dma_addr_t phy_mem_base;
	struct hif_softc *scn = CE_state->scn;

	if (CE_UNUSED == CE_state->state) {
		*ce_sr_base_paddr = 0;
		*ce_sr_ring_size = 0;
		return;
	}

	/* Update default value for descriptor */
	for (ring_loop = 0; ring_loop < CE_state->src_ring->nentries;
	     ring_loop++) {
		ce_desc = (struct CE_src_desc *)
			  ((char *)CE_state->src_ring->base_addr_owner_space +
			   ring_loop * (sizeof(struct CE_src_desc)));
		CE_IPA_RING_INIT(ce_desc);
	}

	/* Get BAR address */
	hif_read_phy_mem_base(CE_state->scn, &phy_mem_base);

	*ce_sr_base_paddr = CE_state->src_ring->base_addr_CE_space;
	*ce_sr_ring_size = (uint32_t) (CE_state->src_ring->nentries *
		sizeof(struct CE_src_desc));
	*ce_reg_paddr = phy_mem_base + CE_BASE_ADDRESS(CE_state->id) +
			SR_WR_INDEX_ADDRESS;
}
#endif /* IPA_OFFLOAD */

static bool ce_check_int_watermark(struct CE_state *CE_state,
				   unsigned int *flags)
{
	uint32_t ce_int_status;
	uint32_t ctrl_addr = CE_state->ctrl_addr;
	struct hif_softc *scn = CE_state->scn;

	ce_int_status = CE_ENGINE_INT_STATUS_GET(scn, ctrl_addr);
	if (ce_int_status & CE_WATERMARK_MASK) {
		/* Convert HW IS bits to software flags */
		*flags =
			(ce_int_status & CE_WATERMARK_MASK) >>
			CE_WM_SHFT;
		return true;
	}

	return false;
}

static void ce_legacy_src_ring_setup(struct hif_softc *scn, uint32_t ce_id,
			struct CE_ring_state *src_ring,
			struct CE_attr *attr)
{
	uint32_t ctrl_addr;
	uint64_t dma_addr;

	QDF_ASSERT(ce_id < scn->ce_count);
	ctrl_addr = CE_BASE_ADDRESS(ce_id);

	src_ring->hw_index =
		CE_SRC_RING_READ_IDX_GET_FROM_REGISTER(scn, ctrl_addr);
	src_ring->sw_index = src_ring->hw_index;
	src_ring->write_index =
		CE_SRC_RING_WRITE_IDX_GET_FROM_REGISTER(scn, ctrl_addr);
	dma_addr = src_ring->base_addr_CE_space;
	CE_SRC_RING_BASE_ADDR_SET(scn, ctrl_addr,
			(uint32_t)(dma_addr & 0xFFFFFFFF));

	/* if SR_BA_ADDRESS_HIGH register exists */
	if (is_register_supported(SR_BA_ADDRESS_HIGH)) {
		uint32_t tmp;

		tmp = CE_SRC_RING_BASE_ADDR_HIGH_GET(
				scn, ctrl_addr);
		tmp &= ~0x1F;
		dma_addr = ((dma_addr >> 32) & 0x1F)|tmp;
		CE_SRC_RING_BASE_ADDR_HIGH_SET(scn,
				ctrl_addr, (uint32_t)dma_addr);
	}
	CE_SRC_RING_SZ_SET(scn, ctrl_addr, src_ring->nentries);
	CE_SRC_RING_DMAX_SET(scn, ctrl_addr, attr->src_sz_max);
#ifdef BIG_ENDIAN_HOST
	/* Enable source ring byte swap for big endian host */
	CE_SRC_RING_BYTE_SWAP_SET(scn, ctrl_addr, 1);
#endif
	CE_SRC_RING_LOWMARK_SET(scn, ctrl_addr, 0);
	CE_SRC_RING_HIGHMARK_SET(scn, ctrl_addr, src_ring->nentries);

}

static void ce_legacy_dest_ring_setup(struct hif_softc *scn, uint32_t ce_id,
				struct CE_ring_state *dest_ring,
				struct CE_attr *attr)
{
	uint32_t ctrl_addr;
	uint64_t dma_addr;

	QDF_ASSERT(ce_id < scn->ce_count);
	ctrl_addr = CE_BASE_ADDRESS(ce_id);
	dest_ring->sw_index =
		CE_DEST_RING_READ_IDX_GET_FROM_REGISTER(scn, ctrl_addr);
	dest_ring->write_index =
		CE_DEST_RING_WRITE_IDX_GET_FROM_REGISTER(scn, ctrl_addr);
	dma_addr = dest_ring->base_addr_CE_space;
	CE_DEST_RING_BASE_ADDR_SET(scn, ctrl_addr,
			(uint32_t)(dma_addr & 0xFFFFFFFF));

	/* if DR_BA_ADDRESS_HIGH exists */
	if (is_register_supported(DR_BA_ADDRESS_HIGH)) {
		uint32_t tmp;

		tmp = CE_DEST_RING_BASE_ADDR_HIGH_GET(scn,
				ctrl_addr);
		tmp &= ~0x1F;
		dma_addr = ((dma_addr >> 32) & 0x1F)|tmp;
		CE_DEST_RING_BASE_ADDR_HIGH_SET(scn,
				ctrl_addr, (uint32_t)dma_addr);
	}

	CE_DEST_RING_SZ_SET(scn, ctrl_addr, dest_ring->nentries);
#ifdef BIG_ENDIAN_HOST
	/* Enable Dest ring byte swap for big endian host */
	CE_DEST_RING_BYTE_SWAP_SET(scn, ctrl_addr, 1);
#endif
	CE_DEST_RING_LOWMARK_SET(scn, ctrl_addr, 0);
	CE_DEST_RING_HIGHMARK_SET(scn, ctrl_addr, dest_ring->nentries);
}

static uint32_t ce_get_desc_size_legacy(uint8_t ring_type)
{
	switch (ring_type) {
	case CE_RING_SRC:
		return sizeof(struct CE_src_desc);
	case CE_RING_DEST:
		return sizeof(struct CE_dest_desc);
	case CE_RING_STATUS:
		qdf_assert(0);
		return 0;
	default:
		return 0;
	}

	return 0;
}

static void ce_ring_setup_legacy(struct hif_softc *scn, uint8_t ring_type,
		uint32_t ce_id, struct CE_ring_state *ring,
		struct CE_attr *attr)
{
	switch (ring_type) {
	case CE_RING_SRC:
		ce_legacy_src_ring_setup(scn, ce_id, ring, attr);
		break;
	case CE_RING_DEST:
		ce_legacy_dest_ring_setup(scn, ce_id, ring, attr);
		break;
	case CE_RING_STATUS:
	default:
		qdf_assert(0);
		break;
	}
}

static void ce_prepare_shadow_register_v2_cfg_legacy(struct hif_softc *scn,
			    struct pld_shadow_reg_v2_cfg **shadow_config,
			    int *num_shadow_registers_configured)
{
	*num_shadow_registers_configured = 0;
	*shadow_config = NULL;
}

struct ce_ops ce_service_legacy = {
	.ce_get_desc_size = ce_get_desc_size_legacy,
	.ce_ring_setup = ce_ring_setup_legacy,
	.ce_sendlist_send = ce_sendlist_send_legacy,
	.ce_completed_recv_next_nolock = ce_completed_recv_next_nolock_legacy,
	.ce_revoke_recv_next = ce_revoke_recv_next_legacy,
	.ce_cancel_send_next = ce_cancel_send_next_legacy,
	.ce_recv_buf_enqueue = ce_recv_buf_enqueue_legacy,
	.ce_per_engine_handler_adjust = ce_per_engine_handler_adjust_legacy,
	.ce_send_nolock = ce_send_nolock_legacy,
	.watermark_int = ce_check_int_watermark,
	.ce_completed_send_next_nolock = ce_completed_send_next_nolock_legacy,
	.ce_recv_entries_done_nolock = ce_recv_entries_done_nolock_legacy,
	.ce_send_entries_done_nolock = ce_send_entries_done_nolock_legacy,
	.ce_prepare_shadow_register_v2_cfg =
		ce_prepare_shadow_register_v2_cfg_legacy,
};


struct ce_ops *ce_services_legacy()
{
	return &ce_service_legacy;
}