drivers/net/wireless/ath/ath11k/dp.c

// SPDX-License-Identifier: BSD-3-Clause-Clear
/*
 * Copyright (c) 2018-2019 The Linux Foundation. All rights reserved.
 */

#include <crypto/hash.h>
#include "core.h"
#include "dp_tx.h"
#include "hal_tx.h"
#include "hif.h"
#include "debug.h"
#include "dp_rx.h"
#include "peer.h"

static void ath11k_dp_htt_htc_tx_complete(struct ath11k_base *ab,
					  struct sk_buff *skb)
{
	dev_kfree_skb_any(skb);
}

void ath11k_dp_peer_cleanup(struct ath11k *ar, int vdev_id, const u8 *addr)
{
	struct ath11k_base *ab = ar->ab;
	struct ath11k_peer *peer;

	/* TODO: Any other peer specific DP cleanup */

	spin_lock_bh(&ab->base_lock);
	peer = ath11k_peer_find(ab, vdev_id, addr);
	if (!peer) {
		ath11k_warn(ab, "failed to lookup peer %pM on vdev %d\n",
			    addr, vdev_id);
		spin_unlock_bh(&ab->base_lock);
		return;
	}

	ath11k_peer_rx_tid_cleanup(ar, peer);
	crypto_free_shash(peer->tfm_mmic);
	spin_unlock_bh(&ab->base_lock);
}

int ath11k_dp_peer_setup(struct ath11k *ar, int vdev_id, const u8 *addr)
{
	struct ath11k_base *ab = ar->ab;
	struct ath11k_peer *peer;
	u32 reo_dest;
	int ret = 0, tid;
	bool rx_hash_enable = DP_RX_HASH_ENABLE;

	/* RX Hash based steering is disabled for NSS Offload */
	if (ath11k_nss_offload_enabled(ab) || !ab->rx_hash)
		rx_hash_enable = DP_RX_HASH_DISABLE;

	/* NOTE: reo_dest ring id starts from 1 unlike mac_id which starts from 0 */
	reo_dest = ar->dp.mac_id + 1;
	ret = ath11k_wmi_set_peer_param(ar, addr, vdev_id,
					WMI_PEER_SET_DEFAULT_ROUTING,
					rx_hash_enable | (reo_dest << 1));

	if (ret) {
		ath11k_warn(ab, "failed to set default routing %d peer :%pM vdev_id :%d\n",
			    ret, addr, vdev_id);
		return ret;
	}

	for (tid = 0; tid <= IEEE80211_NUM_TIDS; tid++) {
		ret = ath11k_peer_rx_tid_setup(ar, addr, vdev_id, tid, 1, 0,
					       HAL_PN_TYPE_NONE);
		if (ret) {
			ath11k_warn(ab, "failed to setup rxd tid queue for tid %d: %d\n",
				    tid, ret);
			goto peer_clean;
		}
	}

	ret = ath11k_peer_rx_frag_setup(ar, addr, vdev_id);
	if (ret) {
		ath11k_warn(ab, "failed to setup rx defrag context\n");
		return ret;
	}

	/* TODO: Setup other peer specific resource used in data path */

	return 0;

peer_clean:
	spin_lock_bh(&ab->base_lock);

	peer = ath11k_peer_find(ab, vdev_id, addr);
	if (!peer) {
		ath11k_warn(ab, "failed to find the peer to del rx tid\n");
		spin_unlock_bh(&ab->base_lock);
		return -ENOENT;
	}

	for (; tid >= 0; tid--)
		ath11k_peer_rx_tid_delete(ar, peer, tid);

	spin_unlock_bh(&ab->base_lock);

	return ret;
}

void ath11k_dp_srng_cleanup(struct ath11k_base *ab, struct dp_srng *ring)
{
	if (!ring->vaddr_unaligned)
		return;

	if (!ring->cached)
		dma_free_coherent(ab->dev, ring->size, ring->vaddr_unaligned,
				  ring->paddr_unaligned);
	else
		kfree(ring->vaddr_unaligned);

	ATH11K_MEMORY_STATS_DEC(ab, dma_alloc, ring->size);

	ring->vaddr_unaligned = NULL;
}

static int ath11k_dp_srng_find_ring_in_mask(int ring_num, const u8 *grp_mask)
{
	int ext_group_num;
	u8 mask = 1 << ring_num;

	for (ext_group_num = 0; ext_group_num < ATH11K_EXT_IRQ_GRP_NUM_MAX;
	     ext_group_num++) {
		if (mask & grp_mask[ext_group_num])
			return ext_group_num;
	}

	return -ENOENT;
}

static int ath11k_dp_srng_calculate_msi_group(struct ath11k_base *ab,
					      enum hal_ring_type type, int ring_num)
{
	const u8 *grp_mask;

	if (ath11k_nss_offload_enabled(ab)) {
		switch (type) {
		case HAL_REO_STATUS:
		case HAL_RXDMA_MONITOR_STATUS:
		case HAL_RXDMA_MONITOR_DST:
		case HAL_RXDMA_MONITOR_BUF:
			break;
		default:
			return -ENOENT;
		}
	}

	switch (type) {
	case HAL_WBM2SW_RELEASE:
		if (ring_num < 3) {
			grp_mask = &ab->hw_params.ring_mask->tx[0];
		} else if (ring_num == 3) {
			grp_mask = &ab->hw_params.ring_mask->rx_wbm_rel[0];
			ring_num = 0;
		} else {
			return -ENOENT;
		}
		break;
	case HAL_REO_EXCEPTION:
		grp_mask = &ab->hw_params.ring_mask->rx_err[0];
		break;
	case HAL_REO_DST:
		grp_mask = &ab->hw_params.ring_mask->rx[0];
		break;
	case HAL_REO_STATUS:
		grp_mask = &ab->hw_params.ring_mask->reo_status[0];
		break;
	case HAL_RXDMA_MONITOR_STATUS:
	case HAL_RXDMA_MONITOR_DST:
		grp_mask = &ab->hw_params.ring_mask->rx_mon_status[0];
		break;
	case HAL_RXDMA_DST:
		grp_mask = &ab->hw_params.ring_mask->rxdma2host[0];
		break;
	case HAL_RXDMA_BUF:
		grp_mask = &ab->hw_params.ring_mask->host2rxdma[0];
		break;
	case HAL_RXDMA_MONITOR_BUF:
	case HAL_TCL_DATA:
	case HAL_TCL_CMD:
	case HAL_REO_CMD:
	case HAL_SW2WBM_RELEASE:
	case HAL_WBM_IDLE_LINK:
	case HAL_TCL_STATUS:
	case HAL_REO_REINJECT:
	case HAL_CE_SRC:
	case HAL_CE_DST:
	case HAL_CE_DST_STATUS:
	default:
		return -ENOENT;
	}

	return ath11k_dp_srng_find_ring_in_mask(ring_num, grp_mask);
}

static void ath11k_dp_srng_msi_setup(struct ath11k_base *ab,
				     struct hal_srng_params *ring_params,
				     enum hal_ring_type type, int ring_num)
{
	int msi_group_number, msi_data_count;
	u32 msi_data_start, msi_irq_start, addr_lo, addr_hi;
	int ret;

	ret = ath11k_get_user_msi_vector(ab, "DP",
					 &msi_data_count, &msi_data_start,
					 &msi_irq_start);
	if (ret)
		return;

	msi_group_number = ath11k_dp_srng_calculate_msi_group(ab, type,
							      ring_num);
	if (msi_group_number < 0) {
		ath11k_dbg(ab, ATH11K_DBG_PCI,
			   "ring not part of an ext_group; ring_type: %d,ring_num %d",
			   type, ring_num);
		ring_params->msi_addr = 0;
		ring_params->msi_data = 0;
		return;
	}

	if (msi_group_number > msi_data_count) {
		ath11k_dbg(ab, ATH11K_DBG_PCI,
			   "multiple msi_groups share one msi, msi_group_num %d",
			   msi_group_number);
	}

	ath11k_get_msi_address(ab, &addr_lo, &addr_hi);

	ring_params->msi_addr = addr_lo;
	ring_params->msi_addr |= (dma_addr_t)(((uint64_t)addr_hi) << 32);

	if (!ab->userpd_id)
		ring_params->msi_data = (msi_group_number % msi_data_count)
					+ msi_data_start;
	else
		ring_params->msi_data = ab->ipci.dp_msi_data[msi_group_number];


	ring_params->flags |= HAL_SRNG_FLAGS_MSI_INTR;
}

int ath11k_dp_srng_setup(struct ath11k_base *ab, struct dp_srng *ring,
			 enum hal_ring_type type, int ring_num,
			 int mac_id, int num_entries)
{
	struct hal_srng_params params = { 0 };
	int entry_sz = ath11k_hal_srng_get_entrysize(ab, type);
	int max_entries = ath11k_hal_srng_get_max_entries(ab, type);
	int ret;
	bool cached;
	unsigned long off;
	u8 align = HAL_RING_BASE_ALIGN;

	if (max_entries < 0 || entry_sz < 0)
		return -EINVAL;

	if (num_entries > max_entries)
		num_entries = max_entries;

	if (type == HAL_RXDMA_DIR_BUF)
		align = HAL_RXDMA_DIR_BUF_RING_BASE_ALIGN;

	/* Allocate the reo dst and tx completion rings from cacheable memory */
	switch (type) {
	case HAL_REO_DST:
	case HAL_WBM2SW_RELEASE:
	case HAL_TCL_CMD:
	case HAL_TCL_DATA:
		cached = true;
		break;
	default:
		cached = false;
	}

	if (ath11k_nss_offload_enabled(ab))
		cached = false;

	ring->size = (num_entries * entry_sz) + align - 1;

	if (!cached) {
		ring->vaddr_unaligned = dma_alloc_coherent(ab->dev, ring->size,
							   &ring->paddr_unaligned,
							   GFP_KERNEL);
	} else {
		ring->vaddr_unaligned = kzalloc(ring->size, GFP_KERNEL);
		ring->paddr_unaligned = virt_to_phys(ring->vaddr_unaligned);
	}

	if (!ring->vaddr_unaligned)
		return -ENOMEM;

	ATH11K_MEMORY_STATS_INC(ab, dma_alloc, ring->size);

	ring->paddr = (dma_addr_t) ALIGN((unsigned long)ring->paddr_unaligned,
					 align);
	off = (unsigned long)ring->paddr - (unsigned long)ring->paddr_unaligned;
	ring->vaddr = (u32 *) ((unsigned long)ring->vaddr_unaligned + off);

	params.ring_base_vaddr = ring->vaddr;
	params.ring_base_paddr = ring->paddr;
	params.num_entries = num_entries;
	ath11k_dp_srng_msi_setup(ab, &params, type, ring_num + mac_id);

	switch (type) {
	case HAL_REO_DST:
		params.intr_batch_cntr_thres_entries =
					HAL_SRNG_INT_BATCH_THRESHOLD_RX;
		params.intr_timer_thres_us = HAL_SRNG_INT_TIMER_THRESHOLD_RX;
		break;
	case HAL_RXDMA_BUF:
	case HAL_RXDMA_MONITOR_BUF:
	case HAL_RXDMA_MONITOR_STATUS:
		params.low_threshold = num_entries >> 3;
		params.flags |= HAL_SRNG_FLAGS_LOW_THRESH_INTR_EN;
		params.intr_timer_thres_us = HAL_SRNG_INT_TIMER_THRESHOLD_RX;
		/* In case of PCI chipsets, we dont have PPDU end interrupts,
		 * so MONITOR STATUS ring is reaped by receiving MSI from srng.
		 * Keep batch threshold as 8 so that an interrupt is received for
		 * every 4 frames in MONITOR_STATUS ring.
		 */
		if ((type == HAL_RXDMA_MONITOR_STATUS) &&
				(params.flags & HAL_SRNG_FLAGS_MSI_INTR))
			params.intr_batch_cntr_thres_entries = 4;
		else
			params.intr_batch_cntr_thres_entries = 0;

		break;
	case HAL_WBM2SW_RELEASE:
		if (ring_num < 3) {
			params.intr_batch_cntr_thres_entries =
					HAL_SRNG_INT_BATCH_THRESHOLD_TX;
			params.intr_timer_thres_us =
					HAL_SRNG_INT_TIMER_THRESHOLD_TX;
			break;
		}
		/* follow through when ring_num >= 3 */
		fallthrough;
	case HAL_REO_EXCEPTION:
	case HAL_REO_REINJECT:
	case HAL_REO_CMD:
	case HAL_REO_STATUS:
	case HAL_TCL_DATA:
	case HAL_TCL_CMD:
	case HAL_TCL_STATUS:
	case HAL_WBM_IDLE_LINK:
	case HAL_SW2WBM_RELEASE:
	case HAL_RXDMA_DST:
	case HAL_RXDMA_MONITOR_DST:
	case HAL_RXDMA_MONITOR_DESC:
		params.intr_batch_cntr_thres_entries =
					HAL_SRNG_INT_BATCH_THRESHOLD_OTHER;
		params.intr_timer_thres_us = HAL_SRNG_INT_TIMER_THRESHOLD_OTHER;
		break;
	case HAL_RXDMA_DIR_BUF:
		break;
	default:
		ath11k_warn(ab, "Not a valid ring type in dp :%d\n", type);
		return -EINVAL;
	}

	if (cached) {
		params.flags |= HAL_SRNG_FLAGS_CACHED;
		ring->cached = 1;
	}

	ret = ath11k_hal_srng_setup(ab, type, ring_num, mac_id, &params);
	if (ret < 0) {
		ath11k_warn(ab, "failed to setup srng: %d ring_id %d\n",
			    ret, ring_num);
		return ret;
	}

	ring->ring_id = ret;

	return 0;
}

void ath11k_dp_stop_shadow_timers(struct ath11k_base *ab)
{
	int i;

	if (!ab->hw_params.supports_shadow_regs)
		return;

	for (i = 0; i < DP_TCL_NUM_RING_MAX; i++)
		ath11k_dp_shadow_stop_timer(ab, &ab->dp.tx_ring_timer[i]);

	ath11k_dp_shadow_stop_timer(ab, &ab->dp.reo_cmd_timer);
}

static void ath11k_dp_handle_reo_status_timer(struct timer_list *timer)
{
	struct ath11k_dp *dp = from_timer(dp, timer, reo_status_timer);
	struct ath11k_base *ab = dp->ab;

	ath11k_dp_process_reo_status(ab);

	mod_timer(&dp->reo_status_timer, jiffies +
		  msecs_to_jiffies(ATH11K_REO_STATUS_POLL_TIMEOUT_MS));
}

static void ath11k_dp_stop_reo_status_timer(struct ath11k_base *ab)
{
	struct ath11k_dp *dp = &ab->dp;

	if (!ab->hw_params.reo_status_poll)
		return;

	del_timer_sync(&dp->reo_status_timer);
}

static void ath11k_dp_init_reo_status_timer(struct ath11k_base *ab)
{
	struct ath11k_dp *dp = &ab->dp;

	if (!ab->hw_params.reo_status_poll)
		return;

	timer_setup(&dp->reo_status_timer,
		    ath11k_dp_handle_reo_status_timer, 0);

	/* Trigger reo status polling periodically */
	mod_timer(&dp->reo_status_timer, jiffies +
		  msecs_to_jiffies(ATH11K_REO_STATUS_POLL_TIMEOUT_MS));
}

static void ath11k_dp_srng_common_cleanup(struct ath11k_base *ab)
{
	struct ath11k_dp *dp = &ab->dp;
	int i;

	ath11k_dp_stop_shadow_timers(ab);
	ath11k_dp_stop_reo_status_timer(ab);
	ath11k_dp_srng_cleanup(ab, &dp->wbm_desc_rel_ring);
	ath11k_dp_srng_cleanup(ab, &dp->tcl_cmd_ring);
	ath11k_dp_srng_cleanup(ab, &dp->tcl_status_ring);
	for (i = 0; i < DP_TCL_NUM_RING_MAX; i++) {
		ath11k_dp_srng_cleanup(ab, &dp->tx_ring[i].tcl_data_ring);
		ath11k_dp_srng_cleanup(ab, &dp->tx_ring[i].tcl_comp_ring);
		kfree(dp->tx_ring[i].idr_pool);
		dp->tx_ring[i].idr_pool = NULL;
	}
	ath11k_dp_srng_cleanup(ab, &dp->reo_reinject_ring);
	ath11k_dp_srng_cleanup(ab, &dp->rx_rel_ring);
	ath11k_dp_srng_cleanup(ab, &dp->reo_except_ring);
	ath11k_dp_srng_cleanup(ab, &dp->reo_cmd_ring);
	ath11k_dp_srng_cleanup(ab, &dp->reo_status_ring);
}

static int ath11k_dp_srng_common_setup(struct ath11k_base *ab)
{
	struct ath11k_dp *dp = &ab->dp;
	struct hal_srng *srng;
	int i, ret, j;
	u32 ring_hash_map;

	ath11k_dp_init_reo_status_timer(ab);

	ret = ath11k_dp_srng_setup(ab, &dp->wbm_desc_rel_ring,
				   HAL_SW2WBM_RELEASE, 0, 0,
				   DP_WBM_RELEASE_RING_SIZE);
	if (ret) {
		ath11k_warn(ab, "failed to set up wbm2sw_release ring :%d\n",
			    ret);
		goto err;
	}

	ret = ath11k_dp_srng_setup(ab, &dp->tcl_cmd_ring, HAL_TCL_CMD, 0, 0,
				   DP_TCL_CMD_RING_SIZE);
	if (ret) {
		ath11k_warn(ab, "failed to set up tcl_cmd ring :%d\n", ret);
		goto err;
	}

	if (ab->hw_params.max_tx_ring > DP_TCL_NUM_RING_MAX) {
		srng = &ab->hal.srng_list[dp->tcl_cmd_ring.ring_id];
		ath11k_hal_tx_init_data_ring(ab, srng, HAL_TCL_CMD);
	}

	ret = ath11k_dp_srng_setup(ab, &dp->tcl_status_ring, HAL_TCL_STATUS,
				   0, 0, DP_TCL_STATUS_RING_SIZE);
	if (ret) {
		ath11k_warn(ab, "failed to set up tcl_status ring :%d\n", ret);
		goto err;
	}

	for (i = 0; i < DP_TCL_NUM_RING_MAX; i++) {
		ret = ath11k_dp_srng_setup(ab, &dp->tx_ring[i].tcl_data_ring,
					   HAL_TCL_DATA, i, 0,
					   DP_TCL_DATA_RING_SIZE);
		if (ret) {
			ath11k_warn(ab, "failed to set up tcl_data ring (%d) :%d\n",
				    i, ret);
			goto err;
		}

		ret = ath11k_dp_srng_setup(ab, &dp->tx_ring[i].tcl_comp_ring,
					   HAL_WBM2SW_RELEASE, i, 0,
					   DP_TX_COMP_RING_SIZE);
		if (ret) {
			ath11k_warn(ab, "failed to set up tcl_comp ring (%d) :%d\n",
				    i, ret);
			goto err;
		}

		srng = &ab->hal.srng_list[dp->tx_ring[i].tcl_data_ring.ring_id];
		ath11k_hal_tx_init_data_ring(ab, srng, HAL_TCL_DATA);

		ath11k_dp_shadow_init_timer(ab, &dp->tx_ring_timer[i],
					    ATH11K_SHADOW_DP_TIMER_INTERVAL,
					    dp->tx_ring[i].tcl_data_ring.ring_id);

		dp->tx_ring[i].idr_pool = kcalloc(DP_TX_IDR_SIZE,
						  sizeof(struct idr_entry), GFP_KERNEL);
		if (!dp->tx_ring[i].idr_pool) {
			ath11k_warn(ab, "failed to allocate memory for idr pool ring(%d)\n", i);
			ret = -ENOMEM;
			goto err;
		}

		/* Reset id to default */
		for (j = 0; j < DP_TX_IDR_SIZE; j++)
			dp->tx_ring[i].idr_pool[j].id = -1;
	}

	ret = ath11k_dp_srng_setup(ab, &dp->reo_reinject_ring, HAL_REO_REINJECT,
				   0, 0, DP_REO_REINJECT_RING_SIZE);
	if (ret) {
		ath11k_warn(ab, "failed to set up reo_reinject ring :%d\n",
			    ret);
		goto err;
	}

	ret = ath11k_dp_srng_setup(ab, &dp->rx_rel_ring, HAL_WBM2SW_RELEASE,
				   3, 0, DP_RX_RELEASE_RING_SIZE);
	if (ret) {
		ath11k_warn(ab, "failed to set up rx_rel ring :%d\n", ret);
		goto err;
	}

	ret = ath11k_dp_srng_setup(ab, &dp->reo_except_ring, HAL_REO_EXCEPTION,
				   0, 0, DP_REO_EXCEPTION_RING_SIZE);
	if (ret) {
		ath11k_warn(ab, "failed to set up reo_exception ring :%d\n",
			    ret);
		goto err;
	}

	ret = ath11k_dp_srng_setup(ab, &dp->reo_cmd_ring, HAL_REO_CMD,
				   0, 0, DP_REO_CMD_RING_SIZE);
	if (ret) {
		ath11k_warn(ab, "failed to set up reo_cmd ring :%d\n", ret);
		goto err;
	}

	srng = &ab->hal.srng_list[dp->reo_cmd_ring.ring_id];
	ath11k_hal_reo_init_cmd_ring(ab, srng);

	ath11k_dp_shadow_init_timer(ab, &dp->reo_cmd_timer,
				    ATH11K_SHADOW_CTRL_TIMER_INTERVAL,
				    dp->reo_cmd_ring.ring_id);

	ret = ath11k_dp_srng_setup(ab, &dp->reo_status_ring, HAL_REO_STATUS,
				   0, 0, DP_REO_STATUS_RING_SIZE);
	if (ret) {
		ath11k_warn(ab, "failed to set up reo_status ring :%d\n", ret);
		goto err;
	}

	/* When hash based routing of rx packet is enabled, 32 entries to map
	 * the hash values to the ring will be configured. Each hash entry uses
	 * three bits to map to a particular ring. The ring mapping will be
	 * 0:TCL, 1:SW1, 2:SW2, 3:SW3, 4:SW4, 5:Release, 6:FW and 7:Not used.
	 */
	ring_hash_map = ab->hw_params.hw_ops->get_reo_dest_remap_config();

	ath11k_hal_reo_hw_setup(ab, ring_hash_map);

	ab->rx_hash = ring_hash_map;

	return 0;

err:
	ath11k_dp_srng_common_cleanup(ab);

	return ret;
}

static void ath11k_dp_scatter_idle_link_desc_cleanup(struct ath11k_base *ab)
{
	struct ath11k_dp *dp = &ab->dp;
	struct hal_wbm_idle_scatter_list *slist = dp->scatter_list;
	int i;

	for (i = 0; i < DP_IDLE_SCATTER_BUFS_MAX; i++) {
		if (!slist[i].vaddr)
			continue;

		dma_free_coherent(ab->dev, HAL_WBM_IDLE_SCATTER_BUF_SIZE_MAX,
				  slist[i].vaddr, slist[i].paddr);
		slist[i].vaddr = NULL;
		ATH11K_MEMORY_STATS_DEC(ab, dma_alloc, HAL_WBM_IDLE_SCATTER_BUF_SIZE_MAX);
	}
}

static int ath11k_dp_scatter_idle_link_desc_setup(struct ath11k_base *ab,
						  int size,
						  u32 n_link_desc_bank,
						  u32 n_link_desc,
						  u32 last_bank_sz)
{
	struct ath11k_dp *dp = &ab->dp;
	struct dp_link_desc_bank *link_desc_banks = dp->link_desc_banks;
	struct hal_wbm_idle_scatter_list *slist = dp->scatter_list;
	u32 n_entries_per_buf;
	int num_scatter_buf, scatter_idx;
	struct hal_wbm_link_desc *scatter_buf;
	int align_bytes, n_entries;
	dma_addr_t paddr;
	int rem_entries;
	int i;
	int ret = 0;
	u32 end_offset;

	n_entries_per_buf = HAL_WBM_IDLE_SCATTER_BUF_SIZE /
		ath11k_hal_srng_get_entrysize(ab, HAL_WBM_IDLE_LINK);
	num_scatter_buf = DIV_ROUND_UP(size, HAL_WBM_IDLE_SCATTER_BUF_SIZE);

	if (num_scatter_buf > DP_IDLE_SCATTER_BUFS_MAX)
		return -EINVAL;

	for (i = 0; i < num_scatter_buf; i++) {
		slist[i].vaddr = dma_alloc_coherent(ab->dev,
						    HAL_WBM_IDLE_SCATTER_BUF_SIZE_MAX,
						    &slist[i].paddr, GFP_KERNEL);
		if (!slist[i].vaddr) {
			ret = -ENOMEM;
			goto err;
		}
		ATH11K_MEMORY_STATS_INC(ab, dma_alloc, HAL_WBM_IDLE_SCATTER_BUF_SIZE_MAX);
	}

	scatter_idx = 0;
	scatter_buf = slist[scatter_idx].vaddr;
	rem_entries = n_entries_per_buf;

	for (i = 0; i < n_link_desc_bank; i++) {
		align_bytes = link_desc_banks[i].vaddr -
			      link_desc_banks[i].vaddr_unaligned;
		n_entries = (DP_LINK_DESC_ALLOC_SIZE_THRESH - align_bytes) /
			     HAL_LINK_DESC_SIZE;
		paddr = link_desc_banks[i].paddr;
		while (n_entries) {
			ath11k_hal_set_link_desc_addr(scatter_buf, i, paddr);
			n_entries--;
			paddr += HAL_LINK_DESC_SIZE;
			if (rem_entries) {
				rem_entries--;
				scatter_buf++;
				continue;
			}

			rem_entries = n_entries_per_buf;
			scatter_idx++;
			scatter_buf = slist[scatter_idx].vaddr;
		}
	}

	end_offset = (scatter_buf - slist[scatter_idx].vaddr) *
		     sizeof(struct hal_wbm_link_desc);
	ath11k_hal_setup_link_idle_list(ab, slist, num_scatter_buf,
					n_link_desc, end_offset);

	return 0;

err:
	ath11k_dp_scatter_idle_link_desc_cleanup(ab);

	return ret;
}

static void
ath11k_dp_link_desc_bank_free(struct ath11k_base *ab,
			      struct dp_link_desc_bank *link_desc_banks)
{
	int i;

	for (i = 0; i < DP_LINK_DESC_BANKS_MAX; i++) {
		if (link_desc_banks[i].vaddr_unaligned) {
			dma_free_coherent(ab->dev,
					  link_desc_banks[i].size,
					  link_desc_banks[i].vaddr_unaligned,
					  link_desc_banks[i].paddr_unaligned);
			link_desc_banks[i].vaddr_unaligned = NULL;
			ATH11K_MEMORY_STATS_DEC(ab, dma_alloc, link_desc_banks[i].size);
		}
	}
}

static int ath11k_dp_link_desc_bank_alloc(struct ath11k_base *ab,
					  struct dp_link_desc_bank *desc_bank,
					  int n_link_desc_bank,
					  int last_bank_sz)
{
	struct ath11k_dp *dp = &ab->dp;
	int i;
	int ret = 0;
	int desc_sz = DP_LINK_DESC_ALLOC_SIZE_THRESH;

	for (i = 0; i < n_link_desc_bank; i++) {
		if (i == (n_link_desc_bank - 1) && last_bank_sz)
			desc_sz = last_bank_sz;

		desc_bank[i].vaddr_unaligned =
					dma_alloc_coherent(ab->dev, desc_sz,
							   &desc_bank[i].paddr_unaligned,
							   GFP_KERNEL);
		if (!desc_bank[i].vaddr_unaligned) {
			ret = -ENOMEM;
			goto err;
		}

		desc_bank[i].vaddr = PTR_ALIGN(desc_bank[i].vaddr_unaligned,
					       HAL_LINK_DESC_ALIGN);
		desc_bank[i].paddr = desc_bank[i].paddr_unaligned +
				     ((unsigned long)desc_bank[i].vaddr -
				      (unsigned long)desc_bank[i].vaddr_unaligned);
		desc_bank[i].size = desc_sz;
		ATH11K_MEMORY_STATS_INC(ab, dma_alloc, desc_bank[i].size);
	}

	return 0;

err:
	ath11k_dp_link_desc_bank_free(ab, dp->link_desc_banks);

	return ret;
}

void ath11k_dp_link_desc_cleanup(struct ath11k_base *ab,
				 struct dp_link_desc_bank *desc_bank,
				 u32 ring_type, struct dp_srng *ring)
{
	ath11k_dp_link_desc_bank_free(ab, desc_bank);

	if (ring_type != HAL_RXDMA_MONITOR_DESC) {
		ath11k_dp_srng_cleanup(ab, ring);
		ath11k_dp_scatter_idle_link_desc_cleanup(ab);
	}
}

static int ath11k_wbm_idle_ring_setup(struct ath11k_base *ab, u32 *n_link_desc)
{
	struct ath11k_dp *dp = &ab->dp;
	u32 n_mpdu_link_desc, n_mpdu_queue_desc;
	u32 n_tx_msdu_link_desc, n_rx_msdu_link_desc;
	int ret = 0;

	n_mpdu_link_desc = (DP_NUM_TIDS_MAX * DP_AVG_MPDUS_PER_TID_MAX) /
			   HAL_NUM_MPDUS_PER_LINK_DESC;

	n_mpdu_queue_desc = n_mpdu_link_desc /
			    HAL_NUM_MPDU_LINKS_PER_QUEUE_DESC;

	n_tx_msdu_link_desc = (DP_NUM_TIDS_MAX * DP_AVG_FLOWS_PER_TID *
			       DP_AVG_MSDUS_PER_FLOW) /
			      HAL_NUM_TX_MSDUS_PER_LINK_DESC;

	n_rx_msdu_link_desc = (DP_NUM_TIDS_MAX * DP_AVG_MPDUS_PER_TID_MAX *
			       DP_AVG_MSDUS_PER_MPDU) /
			      HAL_NUM_RX_MSDUS_PER_LINK_DESC;

	*n_link_desc = n_mpdu_link_desc + n_mpdu_queue_desc +
		      n_tx_msdu_link_desc + n_rx_msdu_link_desc;

	if (*n_link_desc & (*n_link_desc - 1))
		*n_link_desc = 1 << fls(*n_link_desc);

	ret = ath11k_dp_srng_setup(ab, &dp->wbm_idle_ring,
				   HAL_WBM_IDLE_LINK, 0, 0, *n_link_desc);
	if (ret) {
		ath11k_warn(ab, "failed to setup wbm_idle_ring: %d\n", ret);
		return ret;
	}
	return ret;
}

int ath11k_dp_link_desc_setup(struct ath11k_base *ab,
			      struct dp_link_desc_bank *link_desc_banks,
			      u32 ring_type, struct hal_srng *srng,
			      u32 n_link_desc)
{
	u32 tot_mem_sz;
	u32 n_link_desc_bank, last_bank_sz;
	u32 entry_sz, align_bytes, n_entries;
	u32 paddr;
	u32 *desc;
	int i, ret;

	tot_mem_sz = n_link_desc * HAL_LINK_DESC_SIZE;
	tot_mem_sz += HAL_LINK_DESC_ALIGN;

	if (tot_mem_sz <= DP_LINK_DESC_ALLOC_SIZE_THRESH) {
		n_link_desc_bank = 1;
		last_bank_sz = tot_mem_sz;
	} else {
		n_link_desc_bank = tot_mem_sz /
				   (DP_LINK_DESC_ALLOC_SIZE_THRESH -
				    HAL_LINK_DESC_ALIGN);
		last_bank_sz = tot_mem_sz %
			       (DP_LINK_DESC_ALLOC_SIZE_THRESH -
				HAL_LINK_DESC_ALIGN);

		if (last_bank_sz)
			n_link_desc_bank += 1;
	}

	if (n_link_desc_bank > DP_LINK_DESC_BANKS_MAX)
		return -EINVAL;

	ret = ath11k_dp_link_desc_bank_alloc(ab, link_desc_banks,
					     n_link_desc_bank, last_bank_sz);
	if (ret)
		return ret;

	/* Setup link desc idle list for HW internal usage */
	entry_sz = ath11k_hal_srng_get_entrysize(ab, ring_type);
	tot_mem_sz = entry_sz * n_link_desc;

	/* Setup scatter desc list when the total memory requirement is more */
	if (tot_mem_sz > DP_LINK_DESC_ALLOC_SIZE_THRESH &&
	    ring_type != HAL_RXDMA_MONITOR_DESC) {
		ret = ath11k_dp_scatter_idle_link_desc_setup(ab, tot_mem_sz,
							     n_link_desc_bank,
							     n_link_desc,
							     last_bank_sz);
		if (ret) {
			ath11k_warn(ab, "failed to setup scatting idle list descriptor :%d\n",
				    ret);
			goto fail_desc_bank_free;
		}

		return 0;
	}

	spin_lock_bh(&srng->lock);

	ath11k_hal_srng_access_begin(ab, srng);

	for (i = 0; i < n_link_desc_bank; i++) {
		align_bytes = link_desc_banks[i].vaddr -
			      link_desc_banks[i].vaddr_unaligned;
		n_entries = (link_desc_banks[i].size - align_bytes) /
			    HAL_LINK_DESC_SIZE;
		paddr = link_desc_banks[i].paddr;
		while (n_entries &&
		       (desc = ath11k_hal_srng_src_get_next_entry(ab, srng))) {
			ath11k_hal_set_link_desc_addr((struct hal_wbm_link_desc *)desc,
						      i, paddr);
			n_entries--;
			paddr += HAL_LINK_DESC_SIZE;
		}
	}

	ath11k_hal_srng_access_end(ab, srng);

	spin_unlock_bh(&srng->lock);

	return 0;

fail_desc_bank_free:
	ath11k_dp_link_desc_bank_free(ab, link_desc_banks);

	return ret;
}

int ath11k_dp_service_srng(struct ath11k_base *ab,
			   struct ath11k_ext_irq_grp *irq_grp,
			   int budget)
{
	struct napi_struct *napi = &irq_grp->napi;
	int grp_id = irq_grp->grp_id;
	int work_done = 0;
	int i = 0, j;
	int tot_work_done = 0;
	bool nss_offload;
	int original_budget = budget;

	if (budget != ab->napi_poll_budget)
		budget = ab->napi_poll_budget;

	/* Processing of offloaded rings are not required */
	nss_offload = ath11k_nss_offload_enabled(ab);

	if (!nss_offload && ab->hw_params.ring_mask->tx[grp_id]) {
		i = __fls(ab->hw_params.ring_mask->tx[grp_id]);
			ath11k_dp_tx_completion_handler(ab, i);
	}

	if (!nss_offload && ab->hw_params.ring_mask->rx_err[grp_id]) {
		work_done = ath11k_dp_process_rx_err(ab, napi, budget);
		budget -= work_done;
		tot_work_done += work_done;
		if (budget <= 0)
			goto done;
	}

	if (!nss_offload && ab->hw_params.ring_mask->rx_wbm_rel[grp_id]) {
		work_done = ath11k_dp_rx_process_wbm_err(ab,
							 napi,
							 budget);
		budget -= work_done;
		tot_work_done += work_done;

		if (budget <= 0)
			goto done;
	}

	if (!nss_offload && ab->hw_params.ring_mask->rx[grp_id]) {
		i =  fls(ab->hw_params.ring_mask->rx[grp_id]) - 1;
		work_done = ath11k_dp_process_rx(ab, i, napi,
						 budget);
		budget -= work_done;
		tot_work_done += work_done;
		if (budget <= 0)
			goto done;
	}

	if (ab->hw_params.ring_mask->rx_mon_status[grp_id]) {
		for (i = 0; i < ab->num_radios; i++) {
			for (j = 0; j < ab->hw_params.num_rxmda_per_pdev; j++) {
				int id = i * ab->hw_params.num_rxmda_per_pdev + j;

				if (ab->hw_params.ring_mask->rx_mon_status[grp_id] &
					BIT(id)) {
					work_done =
						ath11k_dp_rx_process_mon_rings(ab,
									       id,
									       napi,
									       budget);
					budget -= work_done;
					tot_work_done += work_done;

					if (budget <= 0)
						goto done;
				}
			}
		}
	}

	if (ab->hw_params.ring_mask->reo_status[grp_id])
		ath11k_dp_process_reo_status(ab);

	for (i = 0; !nss_offload && i < ab->num_radios; i++) {
		for (j = 0; j < ab->hw_params.num_rxmda_per_pdev; j++) {
			int id = i * ab->hw_params.num_rxmda_per_pdev + j;

			if (ab->hw_params.ring_mask->rxdma2host[grp_id] & BIT(id)) {
				work_done = ath11k_dp_process_rxdma_err(ab, id, budget);
				budget -= work_done;
				tot_work_done += work_done;
			}

			if (budget <= 0)
				goto done;

			if (ab->hw_params.ring_mask->host2rxdma[grp_id] & BIT(id)) {
				struct ath11k *ar = ath11k_ab_to_ar(ab, id);
				struct ath11k_pdev_dp *dp = &ar->dp;
				struct dp_rxdma_ring *rx_ring = &dp->rx_refill_buf_ring;

				ath11k_dp_rxbufs_replenish(ab, id, rx_ring, 0,
							   HAL_RX_BUF_RBM_SW3_BM,
							   GFP_ATOMIC, NULL);
			}
		}
	}
	/* TODO: Implement handler for other interrupts */

done:
	// Don't call napi_complete_done() if there is more work to do
	if (tot_work_done >= ab->napi_poll_budget)
		tot_work_done = original_budget;
	return tot_work_done;
}
EXPORT_SYMBOL(ath11k_dp_service_srng);

void ath11k_dp_pdev_free(struct ath11k_base *ab, bool ureg_dbgfs)
{
	struct ath11k *ar;
	int i;

	del_timer_sync(&ab->mon_reap_timer);

	for (i = 0; i < ab->num_radios; i++) {
		ar = ab->pdevs[i].ar;
		ath11k_dp_rx_pdev_free(ab, i);
		if (ureg_dbgfs)
			ath11k_debugfs_unregister(ar);
		ath11k_dp_rx_pdev_mon_detach(ar);
	}
}

void ath11k_dp_pdev_pre_alloc(struct ath11k_base *ab)
{
	struct ath11k *ar;
	struct ath11k_pdev_dp *dp;
	int i;
	int j;

	for (i = 0; i <  ab->num_radios; i++) {
		ar = ab->pdevs[i].ar;
		dp = &ar->dp;
		dp->mac_id = i;
		idr_init(&dp->rx_refill_buf_ring.bufs_idr);
		spin_lock_init(&dp->rx_refill_buf_ring.idr_lock);
		atomic_set(&dp->num_tx_pending, 0);
		init_waitqueue_head(&dp->tx_empty_waitq);
		for (j = 0; j < ab->hw_params.num_rxmda_per_pdev; j++) {
			idr_init(&dp->rx_mon_status_refill_ring[j].bufs_idr);
			spin_lock_init(&dp->rx_mon_status_refill_ring[j].idr_lock);
		}
		idr_init(&dp->rxdma_mon_buf_ring.bufs_idr);
		spin_lock_init(&dp->rxdma_mon_buf_ring.idr_lock);
	}
}

int ath11k_dp_pdev_alloc(struct ath11k_base *ab)
{
	struct ath11k *ar;
	int ret;
	int i;

	/* TODO:Per-pdev rx ring unlike tx ring which is mapped to different AC's */
	for (i = 0; i < ab->num_radios; i++) {
		ar = ab->pdevs[i].ar;
		ret = ath11k_dp_rx_pdev_alloc(ab, i);
		if (ret) {
			ath11k_warn(ab, "failed to allocate pdev rx for pdev_id :%d\n",
				    i);
			goto err;
		}
		ret = ath11k_dp_rx_pdev_mon_attach(ar);
		if (ret) {
			ath11k_warn(ab, "failed to initialize mon pdev %d\n",
				    i);
			goto err;
		}
	}

	return 0;

err:
	ath11k_dp_pdev_free(ab, true);

	return ret;
}

int ath11k_dp_htt_connect(struct ath11k_dp *dp)
{
	struct ath11k_htc_svc_conn_req conn_req;
	struct ath11k_htc_svc_conn_resp conn_resp;
	int status;

	memset(&conn_req, 0, sizeof(conn_req));
	memset(&conn_resp, 0, sizeof(conn_resp));

	conn_req.ep_ops.ep_tx_complete = ath11k_dp_htt_htc_tx_complete;
	conn_req.ep_ops.ep_rx_complete = ath11k_dp_htt_htc_t2h_msg_handler;

	/* connect to control service */
	conn_req.service_id = ATH11K_HTC_SVC_ID_HTT_DATA_MSG;

	status = ath11k_htc_connect_service(&dp->ab->htc, &conn_req,
					    &conn_resp);

	if (status)
		return status;

	dp->eid = conn_resp.eid;

	return 0;
}

static void ath11k_dp_update_vdev_search(struct ath11k_vif *arvif)
{
	 /* When v2_map_support is true:for STA mode, enable address
	  * search index, tcl uses ast_hash value in the descriptor.
	  * When v2_map_support is false: for STA mode, dont' enable
	  * address search index.
	  */
	switch (arvif->vdev_type) {
	case WMI_VDEV_TYPE_STA:
		if (arvif->ar->ab->hw_params.htt_peer_map_v2) {
			arvif->hal_addr_search_flags = HAL_TX_ADDRX_EN;
			arvif->search_type = HAL_TX_ADDR_SEARCH_INDEX;
		} else {
			arvif->hal_addr_search_flags = HAL_TX_ADDRY_EN;
			arvif->search_type = HAL_TX_ADDR_SEARCH_DEFAULT;
		}
		break;
	case WMI_VDEV_TYPE_AP:
	case WMI_VDEV_TYPE_IBSS:
		arvif->hal_addr_search_flags = HAL_TX_ADDRX_EN;
		arvif->search_type = HAL_TX_ADDR_SEARCH_DEFAULT;
		break;
	case WMI_VDEV_TYPE_MONITOR:
	default:
		return;
	}
}

void ath11k_dp_vdev_tx_attach(struct ath11k *ar, struct ath11k_vif *arvif)
{
	arvif->tcl_metadata |= FIELD_PREP(HTT_TCL_META_DATA_TYPE, 1) |
			       FIELD_PREP(HTT_TCL_META_DATA_VDEV_ID,
					  arvif->vdev_id) |
			       FIELD_PREP(HTT_TCL_META_DATA_PDEV_ID,
					  ar->pdev->pdev_id);

	/* set HTT extension valid bit to 0 by default */
	arvif->tcl_metadata &= ~HTT_TCL_META_DATA_VALID_HTT;

	ath11k_dp_update_vdev_search(arvif);
}

void ath11k_dp_sta_tx_attach(struct ath11k_sta *arsta, int peer_id)
{
	arsta->tcl_metadata |= FIELD_PREP(HTT_TCL_META_DATA_TYPE, 0) |
			       FIELD_PREP(HTT_TCL_META_DATA_PEER_ID, peer_id);

	/* set HTT extension valid bit to 0 by default */
	arsta->tcl_metadata &= ~HTT_TCL_META_DATA_VALID_HTT;
}

static int ath11k_dp_tx_pending_cleanup(struct ath11k_base *ab, void *skb)
{
	struct sk_buff *msdu = skb;

	dma_unmap_single(ab->dev, ATH11K_SKB_CB(msdu)->paddr, msdu->len,
			 DMA_TO_DEVICE);

	dev_kfree_skb_any(msdu);

	return 0;
}

void ath11k_dp_free(struct ath11k_base *ab)
{
	struct ath11k_dp *dp = &ab->dp;
	size_t size = 0;
	int i, j;

	size = sizeof(struct hal_wbm_release_ring) * DP_TX_COMP_RING_SIZE;

	ath11k_dp_link_desc_cleanup(ab, dp->link_desc_banks,
				    HAL_WBM_IDLE_LINK, &dp->wbm_idle_ring);

	for (i = 0; i < DP_TCL_NUM_RING_MAX; i++) {
		struct dp_tx_ring *tx_ring = &dp->tx_ring[i];
		spin_lock_bh(&tx_ring->tx_idr_lock);
		for(j = 0; j < DP_TX_IDR_SIZE; j++) {

			if (test_and_clear_bit(j, tx_ring->idrs))
				ath11k_dp_tx_pending_cleanup(ab, tx_ring->idr_pool[j].buf);
		}

		spin_unlock_bh(&tx_ring->tx_idr_lock);
	}

	ath11k_dp_srng_common_cleanup(ab);

	ath11k_dp_reo_cmd_list_cleanup(ab);

	for (i = 0; i < DP_TCL_NUM_RING_MAX; i++) {
		ATH11K_MEMORY_STATS_DEC(ab, malloc_size, size);
		kfree(dp->tx_ring[i].tx_status);
	}

	/* Deinit any SOC level resource */
}

int ath11k_dp_alloc(struct ath11k_base *ab)
{
	struct ath11k_dp *dp = &ab->dp;
	struct hal_srng *srng = NULL;
	size_t size = 0;
	u32 n_link_desc = 0;
	int ret;
	int i;

	dp->ab = ab;

	INIT_LIST_HEAD(&dp->reo_cmd_list);
	INIT_LIST_HEAD(&dp->reo_cmd_cache_flush_list);
	INIT_LIST_HEAD(&dp->dp_full_mon_mpdu_list);
	spin_lock_init(&dp->reo_cmd_lock);

	dp->reo_cmd_cache_flush_count = 0;

	ret = ath11k_wbm_idle_ring_setup(ab, &n_link_desc);
	if (ret) {
		ath11k_warn(ab, "failed to setup wbm_idle_ring: %d\n", ret);
		return ret;
	}

	srng = &ab->hal.srng_list[dp->wbm_idle_ring.ring_id];

	ret = ath11k_dp_link_desc_setup(ab, dp->link_desc_banks,
					HAL_WBM_IDLE_LINK, srng, n_link_desc);
	if (ret) {
		ath11k_warn(ab, "failed to setup link desc: %d\n", ret);
		return ret;
	}

	ret = ath11k_dp_srng_common_setup(ab);
	if (ret)
		goto fail_link_desc_cleanup;

	size = sizeof(struct hal_wbm_release_ring) * DP_TX_COMP_RING_SIZE;

	for (i = 0; i < DP_TCL_NUM_RING_MAX; i++) {
		idr_init(&dp->tx_ring[i].txbuf_idr);
		spin_lock_init(&dp->tx_ring[i].tx_idr_lock);
		dp->tx_ring[i].tcl_data_ring_id = i;

		dp->tx_ring[i].tx_status_head = 0;
		dp->tx_ring[i].tx_status_tail = DP_TX_COMP_RING_SIZE - 1;
		dp->tx_ring[i].tx_status = kmalloc(size, GFP_KERNEL);
		if (!dp->tx_ring[i].tx_status) {
			ret = -ENOMEM;
			goto fail_cmn_srng_cleanup;
		}
		ATH11K_MEMORY_STATS_INC(ab, malloc_size, size);
	}

	for (i = 0; i < ab->hw_params.num_dscp_tid_map_tbl; i++)
		ath11k_hal_tx_set_dscp_tid_map(ab, i);

	ab->napi_poll_budget = NAPI_POLL_WEIGHT;
	/* Init any SOC level resource for DP */

	return 0;

fail_cmn_srng_cleanup:
	ath11k_dp_srng_common_cleanup(ab);

fail_link_desc_cleanup:
	ath11k_dp_link_desc_cleanup(ab, dp->link_desc_banks,
				    HAL_WBM_IDLE_LINK, &dp->wbm_idle_ring);

	return ret;
}

static void ath11k_dp_shadow_timer_handler(struct timer_list *t)
{
	struct ath11k_hp_update_timer *update_timer = from_timer(update_timer,
								 t, timer);
	struct ath11k_base *ab = update_timer->ab;
	struct hal_srng	*srng = &ab->hal.srng_list[update_timer->ring_id];

	spin_lock_bh(&srng->lock);

	/* when the timer is fired, the handler checks whether there
	 * are new TX happened. The handler updates HP only when there
	 * are no TX operations during the timeout interval, and stop
	 * the timer. Timer will be started again when TX happens again.
	 */
	if (update_timer->timer_tx_num != update_timer->tx_num) {
		update_timer->timer_tx_num = update_timer->tx_num;
		mod_timer(&update_timer->timer, jiffies +
		  msecs_to_jiffies(update_timer->interval));
	} else {
		update_timer->started = false;
		ath11k_hal_srng_shadow_update_hp_tp(ab, srng);
	}

	spin_unlock_bh(&srng->lock);
}

void ath11k_dp_shadow_start_timer(struct ath11k_base *ab,
				  struct hal_srng *srng,
				  struct ath11k_hp_update_timer *update_timer)
{
	lockdep_assert_held(&srng->lock);

	if (!ab->hw_params.supports_shadow_regs)
		return;

	update_timer->tx_num++;

	if (update_timer->started)
		return;

	update_timer->started = true;
	update_timer->timer_tx_num = update_timer->tx_num;
	mod_timer(&update_timer->timer, jiffies +
		  msecs_to_jiffies(update_timer->interval));
}

void ath11k_dp_shadow_stop_timer(struct ath11k_base *ab,
				 struct ath11k_hp_update_timer *update_timer)
{
	if (!ab->hw_params.supports_shadow_regs)
		return;

	if (!update_timer->init)
		return;

	del_timer_sync(&update_timer->timer);
}

void ath11k_dp_shadow_init_timer(struct ath11k_base *ab,
				 struct ath11k_hp_update_timer *update_timer,
				 u32 interval, u32 ring_id)
{
	if (!ab->hw_params.supports_shadow_regs)
		return;

	update_timer->tx_num = 0;
	update_timer->timer_tx_num = 0;
	update_timer->ab = ab;
	update_timer->ring_id = ring_id;
	update_timer->interval = interval;
	update_timer->init = true;
	timer_setup(&update_timer->timer,
		    ath11k_dp_shadow_timer_handler, 0);
}