drivers/net/ethernet/intel/i40e/i40e_lan_hmc.c

// SPDX-License-Identifier: GPL-2.0
/* Copyright(c) 2013 - 2018 Intel Corporation. */

#include "i40e.h"
#include "i40e_osdep.h"
#include "i40e_register.h"
#include "i40e_type.h"
#include "i40e_hmc.h"
#include "i40e_lan_hmc.h"
#include "i40e_prototype.h"

/* lan specific interface functions */

/**
 * i40e_align_l2obj_base - aligns base object pointer to 512 bytes
 * @offset: base address offset needing alignment
 *
 * Aligns the layer 2 function private memory so it's 512-byte aligned.
 **/
static u64 i40e_align_l2obj_base(u64 offset)
{
	u64 aligned_offset = offset;

	if ((offset % I40E_HMC_L2OBJ_BASE_ALIGNMENT) > 0)
		aligned_offset += (I40E_HMC_L2OBJ_BASE_ALIGNMENT -
				   (offset % I40E_HMC_L2OBJ_BASE_ALIGNMENT));

	return aligned_offset;
}

/**
 * i40e_calculate_l2fpm_size - calculates layer 2 FPM memory size
 * @txq_num: number of Tx queues needing backing context
 * @rxq_num: number of Rx queues needing backing context
 * @fcoe_cntx_num: amount of FCoE statefull contexts needing backing context
 * @fcoe_filt_num: number of FCoE filters needing backing context
 *
 * Calculates the maximum amount of memory for the function required, based
 * on the number of resources it must provide context for.
 **/
static u64 i40e_calculate_l2fpm_size(u32 txq_num, u32 rxq_num,
			      u32 fcoe_cntx_num, u32 fcoe_filt_num)
{
	u64 fpm_size = 0;

	fpm_size = txq_num * I40E_HMC_OBJ_SIZE_TXQ;
	fpm_size = i40e_align_l2obj_base(fpm_size);

	fpm_size += (rxq_num * I40E_HMC_OBJ_SIZE_RXQ);
	fpm_size = i40e_align_l2obj_base(fpm_size);

	fpm_size += (fcoe_cntx_num * I40E_HMC_OBJ_SIZE_FCOE_CNTX);
	fpm_size = i40e_align_l2obj_base(fpm_size);

	fpm_size += (fcoe_filt_num * I40E_HMC_OBJ_SIZE_FCOE_FILT);
	fpm_size = i40e_align_l2obj_base(fpm_size);

	return fpm_size;
}

/**
 * i40e_init_lan_hmc - initialize i40e_hmc_info struct
 * @hw: pointer to the HW structure
 * @txq_num: number of Tx queues needing backing context
 * @rxq_num: number of Rx queues needing backing context
 * @fcoe_cntx_num: amount of FCoE statefull contexts needing backing context
 * @fcoe_filt_num: number of FCoE filters needing backing context
 *
 * This function will be called once per physical function initialization.
 * It will fill out the i40e_hmc_obj_info structure for LAN objects based on
 * the driver's provided input, as well as information from the HMC itself
 * loaded from NVRAM.
 *
 * Assumptions:
 *   - HMC Resource Profile has been selected before calling this function.
 **/
int i40e_init_lan_hmc(struct i40e_hw *hw, u32 txq_num,
		      u32 rxq_num, u32 fcoe_cntx_num,
		      u32 fcoe_filt_num)
{
	struct i40e_hmc_obj_info *obj, *full_obj;
	int ret_code = 0;
	u64 l2fpm_size;
	u32 size_exp;

	hw->hmc.signature = I40E_HMC_INFO_SIGNATURE;
	hw->hmc.hmc_fn_id = hw->pf_id;

	/* allocate memory for hmc_obj */
	ret_code = i40e_allocate_virt_mem(hw, &hw->hmc.hmc_obj_virt_mem,
			sizeof(struct i40e_hmc_obj_info) * I40E_HMC_LAN_MAX);
	if (ret_code)
		goto init_lan_hmc_out;
	hw->hmc.hmc_obj = (struct i40e_hmc_obj_info *)
			  hw->hmc.hmc_obj_virt_mem.va;

	/* The full object will be used to create the LAN HMC SD */
	full_obj = &hw->hmc.hmc_obj[I40E_HMC_LAN_FULL];
	full_obj->max_cnt = 0;
	full_obj->cnt = 0;
	full_obj->base = 0;
	full_obj->size = 0;

	/* Tx queue context information */
	obj = &hw->hmc.hmc_obj[I40E_HMC_LAN_TX];
	obj->max_cnt = rd32(hw, I40E_GLHMC_LANQMAX);
	obj->cnt = txq_num;
	obj->base = 0;
	size_exp = rd32(hw, I40E_GLHMC_LANTXOBJSZ);
	obj->size = BIT_ULL(size_exp);

	/* validate values requested by driver don't exceed HMC capacity */
	if (txq_num > obj->max_cnt) {
		ret_code = I40E_ERR_INVALID_HMC_OBJ_COUNT;
		hw_dbg(hw, "i40e_init_lan_hmc: Tx context: asks for 0x%x but max allowed is 0x%x, returns error %d\n",
			  txq_num, obj->max_cnt, ret_code);
		goto init_lan_hmc_out;
	}

	/* aggregate values into the full LAN object for later */
	full_obj->max_cnt += obj->max_cnt;
	full_obj->cnt += obj->cnt;

	/* Rx queue context information */
	obj = &hw->hmc.hmc_obj[I40E_HMC_LAN_RX];
	obj->max_cnt = rd32(hw, I40E_GLHMC_LANQMAX);
	obj->cnt = rxq_num;
	obj->base = hw->hmc.hmc_obj[I40E_HMC_LAN_TX].base +
		    (hw->hmc.hmc_obj[I40E_HMC_LAN_TX].cnt *
		     hw->hmc.hmc_obj[I40E_HMC_LAN_TX].size);
	obj->base = i40e_align_l2obj_base(obj->base);
	size_exp = rd32(hw, I40E_GLHMC_LANRXOBJSZ);
	obj->size = BIT_ULL(size_exp);

	/* validate values requested by driver don't exceed HMC capacity */
	if (rxq_num > obj->max_cnt) {
		ret_code = I40E_ERR_INVALID_HMC_OBJ_COUNT;
		hw_dbg(hw, "i40e_init_lan_hmc: Rx context: asks for 0x%x but max allowed is 0x%x, returns error %d\n",
			  rxq_num, obj->max_cnt, ret_code);
		goto init_lan_hmc_out;
	}

	/* aggregate values into the full LAN object for later */
	full_obj->max_cnt += obj->max_cnt;
	full_obj->cnt += obj->cnt;

	/* FCoE context information */
	obj = &hw->hmc.hmc_obj[I40E_HMC_FCOE_CTX];
	obj->max_cnt = rd32(hw, I40E_GLHMC_FCOEMAX);
	obj->cnt = fcoe_cntx_num;
	obj->base = hw->hmc.hmc_obj[I40E_HMC_LAN_RX].base +
		    (hw->hmc.hmc_obj[I40E_HMC_LAN_RX].cnt *
		     hw->hmc.hmc_obj[I40E_HMC_LAN_RX].size);
	obj->base = i40e_align_l2obj_base(obj->base);
	size_exp = rd32(hw, I40E_GLHMC_FCOEDDPOBJSZ);
	obj->size = BIT_ULL(size_exp);

	/* validate values requested by driver don't exceed HMC capacity */
	if (fcoe_cntx_num > obj->max_cnt) {
		ret_code = I40E_ERR_INVALID_HMC_OBJ_COUNT;
		hw_dbg(hw, "i40e_init_lan_hmc: FCoE context: asks for 0x%x but max allowed is 0x%x, returns error %d\n",
			  fcoe_cntx_num, obj->max_cnt, ret_code);
		goto init_lan_hmc_out;
	}

	/* aggregate values into the full LAN object for later */
	full_obj->max_cnt += obj->max_cnt;
	full_obj->cnt += obj->cnt;

	/* FCoE filter information */
	obj = &hw->hmc.hmc_obj[I40E_HMC_FCOE_FILT];
	obj->max_cnt = rd32(hw, I40E_GLHMC_FCOEFMAX);
	obj->cnt = fcoe_filt_num;
	obj->base = hw->hmc.hmc_obj[I40E_HMC_FCOE_CTX].base +
		    (hw->hmc.hmc_obj[I40E_HMC_FCOE_CTX].cnt *
		     hw->hmc.hmc_obj[I40E_HMC_FCOE_CTX].size);
	obj->base = i40e_align_l2obj_base(obj->base);
	size_exp = rd32(hw, I40E_GLHMC_FCOEFOBJSZ);
	obj->size = BIT_ULL(size_exp);

	/* validate values requested by driver don't exceed HMC capacity */
	if (fcoe_filt_num > obj->max_cnt) {
		ret_code = I40E_ERR_INVALID_HMC_OBJ_COUNT;
		hw_dbg(hw, "i40e_init_lan_hmc: FCoE filter: asks for 0x%x but max allowed is 0x%x, returns error %d\n",
			  fcoe_filt_num, obj->max_cnt, ret_code);
		goto init_lan_hmc_out;
	}

	/* aggregate values into the full LAN object for later */
	full_obj->max_cnt += obj->max_cnt;
	full_obj->cnt += obj->cnt;

	hw->hmc.first_sd_index = 0;
	hw->hmc.sd_table.ref_cnt = 0;
	l2fpm_size = i40e_calculate_l2fpm_size(txq_num, rxq_num, fcoe_cntx_num,
					       fcoe_filt_num);
	if (NULL == hw->hmc.sd_table.sd_entry) {
		hw->hmc.sd_table.sd_cnt = (u32)
				   (l2fpm_size + I40E_HMC_DIRECT_BP_SIZE - 1) /
				   I40E_HMC_DIRECT_BP_SIZE;

		/* allocate the sd_entry members in the sd_table */
		ret_code = i40e_allocate_virt_mem(hw, &hw->hmc.sd_table.addr,
					  (sizeof(struct i40e_hmc_sd_entry) *
					  hw->hmc.sd_table.sd_cnt));
		if (ret_code)
			goto init_lan_hmc_out;
		hw->hmc.sd_table.sd_entry =
			(struct i40e_hmc_sd_entry *)hw->hmc.sd_table.addr.va;
	}
	/* store in the LAN full object for later */
	full_obj->size = l2fpm_size;

init_lan_hmc_out:
	return ret_code;
}

/**
 * i40e_remove_pd_page - Remove a page from the page descriptor table
 * @hw: pointer to the HW structure
 * @hmc_info: pointer to the HMC configuration information structure
 * @idx: segment descriptor index to find the relevant page descriptor
 *
 * This function:
 *	1. Marks the entry in pd table (for paged address mode) invalid
 *	2. write to register PMPDINV to invalidate the backing page in FV cache
 *	3. Decrement the ref count for  pd_entry
 * assumptions:
 *	1. caller can deallocate the memory used by pd after this function
 *	   returns.
 **/
static int i40e_remove_pd_page(struct i40e_hw *hw,
			       struct i40e_hmc_info *hmc_info,
			       u32 idx)
{
	int ret_code = 0;

	if (!i40e_prep_remove_pd_page(hmc_info, idx))
		ret_code = i40e_remove_pd_page_new(hw, hmc_info, idx, true);

	return ret_code;
}

/**
 * i40e_remove_sd_bp - remove a backing page from a segment descriptor
 * @hw: pointer to our HW structure
 * @hmc_info: pointer to the HMC configuration information structure
 * @idx: the page index
 *
 * This function:
 *	1. Marks the entry in sd table (for direct address mode) invalid
 *	2. write to register PMSDCMD, PMSDDATALOW(PMSDDATALOW.PMSDVALID set
 *	   to 0) and PMSDDATAHIGH to invalidate the sd page
 *	3. Decrement the ref count for the sd_entry
 * assumptions:
 *	1. caller can deallocate the memory used by backing storage after this
 *	   function returns.
 **/
static int i40e_remove_sd_bp(struct i40e_hw *hw,
			     struct i40e_hmc_info *hmc_info,
			     u32 idx)
{
	int ret_code = 0;

	if (!i40e_prep_remove_sd_bp(hmc_info, idx))
		ret_code = i40e_remove_sd_bp_new(hw, hmc_info, idx, true);

	return ret_code;
}

/**
 * i40e_create_lan_hmc_object - allocate backing store for hmc objects
 * @hw: pointer to the HW structure
 * @info: pointer to i40e_hmc_create_obj_info struct
 *
 * This will allocate memory for PDs and backing pages and populate
 * the sd and pd entries.
 **/
static int i40e_create_lan_hmc_object(struct i40e_hw *hw,
				      struct i40e_hmc_lan_create_obj_info *info)
{
	struct i40e_hmc_sd_entry *sd_entry;
	u32 pd_idx1 = 0, pd_lmt1 = 0;
	u32 pd_idx = 0, pd_lmt = 0;
	bool pd_error = false;
	u32 sd_idx, sd_lmt;
	int ret_code = 0;
	u64 sd_size;
	u32 i, j;

	if (NULL == info) {
		ret_code = I40E_ERR_BAD_PTR;
		hw_dbg(hw, "i40e_create_lan_hmc_object: bad info ptr\n");
		goto exit;
	}
	if (NULL == info->hmc_info) {
		ret_code = I40E_ERR_BAD_PTR;
		hw_dbg(hw, "i40e_create_lan_hmc_object: bad hmc_info ptr\n");
		goto exit;
	}
	if (I40E_HMC_INFO_SIGNATURE != info->hmc_info->signature) {
		ret_code = I40E_ERR_BAD_PTR;
		hw_dbg(hw, "i40e_create_lan_hmc_object: bad signature\n");
		goto exit;
	}

	if (info->start_idx >= info->hmc_info->hmc_obj[info->rsrc_type].cnt) {
		ret_code = I40E_ERR_INVALID_HMC_OBJ_INDEX;
		hw_dbg(hw, "i40e_create_lan_hmc_object: returns error %d\n",
			  ret_code);
		goto exit;
	}
	if ((info->start_idx + info->count) >
	    info->hmc_info->hmc_obj[info->rsrc_type].cnt) {
		ret_code = I40E_ERR_INVALID_HMC_OBJ_COUNT;
		hw_dbg(hw, "i40e_create_lan_hmc_object: returns error %d\n",
			  ret_code);
		goto exit;
	}

	/* find sd index and limit */
	I40E_FIND_SD_INDEX_LIMIT(info->hmc_info, info->rsrc_type,
				 info->start_idx, info->count,
				 &sd_idx, &sd_lmt);
	if (sd_idx >= info->hmc_info->sd_table.sd_cnt ||
	    sd_lmt > info->hmc_info->sd_table.sd_cnt) {
			ret_code = I40E_ERR_INVALID_SD_INDEX;
			goto exit;
	}
	/* find pd index */
	I40E_FIND_PD_INDEX_LIMIT(info->hmc_info, info->rsrc_type,
				 info->start_idx, info->count, &pd_idx,
				 &pd_lmt);

	/* This is to cover for cases where you may not want to have an SD with
	 * the full 2M memory but something smaller. By not filling out any
	 * size, the function will default the SD size to be 2M.
	 */
	if (info->direct_mode_sz == 0)
		sd_size = I40E_HMC_DIRECT_BP_SIZE;
	else
		sd_size = info->direct_mode_sz;

	/* check if all the sds are valid. If not, allocate a page and
	 * initialize it.
	 */
	for (j = sd_idx; j < sd_lmt; j++) {
		/* update the sd table entry */
		ret_code = i40e_add_sd_table_entry(hw, info->hmc_info, j,
						   info->entry_type,
						   sd_size);
		if (ret_code)
			goto exit_sd_error;
		sd_entry = &info->hmc_info->sd_table.sd_entry[j];
		if (I40E_SD_TYPE_PAGED == sd_entry->entry_type) {
			/* check if all the pds in this sd are valid. If not,
			 * allocate a page and initialize it.
			 */

			/* find pd_idx and pd_lmt in this sd */
			pd_idx1 = max(pd_idx, (j * I40E_HMC_MAX_BP_COUNT));
			pd_lmt1 = min(pd_lmt,
				      ((j + 1) * I40E_HMC_MAX_BP_COUNT));
			for (i = pd_idx1; i < pd_lmt1; i++) {
				/* update the pd table entry */
				ret_code = i40e_add_pd_table_entry(hw,
								info->hmc_info,
								i, NULL);
				if (ret_code) {
					pd_error = true;
					break;
				}
			}
			if (pd_error) {
				/* remove the backing pages from pd_idx1 to i */
				while (i && (i > pd_idx1)) {
					i40e_remove_pd_bp(hw, info->hmc_info,
							  (i - 1));
					i--;
				}
			}
		}
		if (!sd_entry->valid) {
			sd_entry->valid = true;
			switch (sd_entry->entry_type) {
			case I40E_SD_TYPE_PAGED:
				I40E_SET_PF_SD_ENTRY(hw,
					sd_entry->u.pd_table.pd_page_addr.pa,
					j, sd_entry->entry_type);
				break;
			case I40E_SD_TYPE_DIRECT:
				I40E_SET_PF_SD_ENTRY(hw, sd_entry->u.bp.addr.pa,
						     j, sd_entry->entry_type);
				break;
			default:
				ret_code = I40E_ERR_INVALID_SD_TYPE;
				goto exit;
			}
		}
	}
	goto exit;

exit_sd_error:
	/* cleanup for sd entries from j to sd_idx */
	while (j && (j > sd_idx)) {
		sd_entry = &info->hmc_info->sd_table.sd_entry[j - 1];
		switch (sd_entry->entry_type) {
		case I40E_SD_TYPE_PAGED:
			pd_idx1 = max(pd_idx,
				      ((j - 1) * I40E_HMC_MAX_BP_COUNT));
			pd_lmt1 = min(pd_lmt, (j * I40E_HMC_MAX_BP_COUNT));
			for (i = pd_idx1; i < pd_lmt1; i++)
				i40e_remove_pd_bp(hw, info->hmc_info, i);
			i40e_remove_pd_page(hw, info->hmc_info, (j - 1));
			break;
		case I40E_SD_TYPE_DIRECT:
			i40e_remove_sd_bp(hw, info->hmc_info, (j - 1));
			break;
		default:
			ret_code = I40E_ERR_INVALID_SD_TYPE;
			break;
		}
		j--;
	}
exit:
	return ret_code;
}

/**
 * i40e_configure_lan_hmc - prepare the HMC backing store
 * @hw: pointer to the hw structure
 * @model: the model for the layout of the SD/PD tables
 *
 * - This function will be called once per physical function initialization.
 * - This function will be called after i40e_init_lan_hmc() and before
 *   any LAN/FCoE HMC objects can be created.
 **/
int i40e_configure_lan_hmc(struct i40e_hw *hw,
			   enum i40e_hmc_model model)
{
	struct i40e_hmc_lan_create_obj_info info;
	u8 hmc_fn_id = hw->hmc.hmc_fn_id;
	struct i40e_hmc_obj_info *obj;
	int ret_code = 0;

	/* Initialize part of the create object info struct */
	info.hmc_info = &hw->hmc;
	info.rsrc_type = I40E_HMC_LAN_FULL;
	info.start_idx = 0;
	info.direct_mode_sz = hw->hmc.hmc_obj[I40E_HMC_LAN_FULL].size;

	/* Build the SD entry for the LAN objects */
	switch (model) {
	case I40E_HMC_MODEL_DIRECT_PREFERRED:
	case I40E_HMC_MODEL_DIRECT_ONLY:
		info.entry_type = I40E_SD_TYPE_DIRECT;
		/* Make one big object, a single SD */
		info.count = 1;
		ret_code = i40e_create_lan_hmc_object(hw, &info);
		if (ret_code && (model == I40E_HMC_MODEL_DIRECT_PREFERRED))
			goto try_type_paged;
		else if (ret_code)
			goto configure_lan_hmc_out;
		/* else clause falls through the break */
		break;
	case I40E_HMC_MODEL_PAGED_ONLY:
try_type_paged:
		info.entry_type = I40E_SD_TYPE_PAGED;
		/* Make one big object in the PD table */
		info.count = 1;
		ret_code = i40e_create_lan_hmc_object(hw, &info);
		if (ret_code)
			goto configure_lan_hmc_out;
		break;
	default:
		/* unsupported type */
		ret_code = I40E_ERR_INVALID_SD_TYPE;
		hw_dbg(hw, "i40e_configure_lan_hmc: Unknown SD type: %d\n",
			  ret_code);
		goto configure_lan_hmc_out;
	}

	/* Configure and program the FPM registers so objects can be created */

	/* Tx contexts */
	obj = &hw->hmc.hmc_obj[I40E_HMC_LAN_TX];
	wr32(hw, I40E_GLHMC_LANTXBASE(hmc_fn_id),
	     (u32)((obj->base & I40E_GLHMC_LANTXBASE_FPMLANTXBASE_MASK) / 512));
	wr32(hw, I40E_GLHMC_LANTXCNT(hmc_fn_id), obj->cnt);

	/* Rx contexts */
	obj = &hw->hmc.hmc_obj[I40E_HMC_LAN_RX];
	wr32(hw, I40E_GLHMC_LANRXBASE(hmc_fn_id),
	     (u32)((obj->base & I40E_GLHMC_LANRXBASE_FPMLANRXBASE_MASK) / 512));
	wr32(hw, I40E_GLHMC_LANRXCNT(hmc_fn_id), obj->cnt);

	/* FCoE contexts */
	obj = &hw->hmc.hmc_obj[I40E_HMC_FCOE_CTX];
	wr32(hw, I40E_GLHMC_FCOEDDPBASE(hmc_fn_id),
	 (u32)((obj->base & I40E_GLHMC_FCOEDDPBASE_FPMFCOEDDPBASE_MASK) / 512));
	wr32(hw, I40E_GLHMC_FCOEDDPCNT(hmc_fn_id), obj->cnt);

	/* FCoE filters */
	obj = &hw->hmc.hmc_obj[I40E_HMC_FCOE_FILT];
	wr32(hw, I40E_GLHMC_FCOEFBASE(hmc_fn_id),
	     (u32)((obj->base & I40E_GLHMC_FCOEFBASE_FPMFCOEFBASE_MASK) / 512));
	wr32(hw, I40E_GLHMC_FCOEFCNT(hmc_fn_id), obj->cnt);

configure_lan_hmc_out:
	return ret_code;
}

/**
 * i40e_delete_lan_hmc_object - remove hmc objects
 * @hw: pointer to the HW structure
 * @info: pointer to i40e_hmc_delete_obj_info struct
 *
 * This will de-populate the SDs and PDs.  It frees
 * the memory for PDS and backing storage.  After this function is returned,
 * caller should deallocate memory allocated previously for
 * book-keeping information about PDs and backing storage.
 **/
static int i40e_delete_lan_hmc_object(struct i40e_hw *hw,
				      struct i40e_hmc_lan_delete_obj_info *info)
{
	struct i40e_hmc_pd_table *pd_table;
	u32 pd_idx, pd_lmt, rel_pd_idx;
	u32 sd_idx, sd_lmt;
	int ret_code = 0;
	u32 i, j;

	if (NULL == info) {
		ret_code = I40E_ERR_BAD_PTR;
		hw_dbg(hw, "i40e_delete_hmc_object: bad info ptr\n");
		goto exit;
	}
	if (NULL == info->hmc_info) {
		ret_code = I40E_ERR_BAD_PTR;
		hw_dbg(hw, "i40e_delete_hmc_object: bad info->hmc_info ptr\n");
		goto exit;
	}
	if (I40E_HMC_INFO_SIGNATURE != info->hmc_info->signature) {
		ret_code = I40E_ERR_BAD_PTR;
		hw_dbg(hw, "i40e_delete_hmc_object: bad hmc_info->signature\n");
		goto exit;
	}

	if (NULL == info->hmc_info->sd_table.sd_entry) {
		ret_code = I40E_ERR_BAD_PTR;
		hw_dbg(hw, "i40e_delete_hmc_object: bad sd_entry\n");
		goto exit;
	}

	if (NULL == info->hmc_info->hmc_obj) {
		ret_code = I40E_ERR_BAD_PTR;
		hw_dbg(hw, "i40e_delete_hmc_object: bad hmc_info->hmc_obj\n");
		goto exit;
	}
	if (info->start_idx >= info->hmc_info->hmc_obj[info->rsrc_type].cnt) {
		ret_code = I40E_ERR_INVALID_HMC_OBJ_INDEX;
		hw_dbg(hw, "i40e_delete_hmc_object: returns error %d\n",
			  ret_code);
		goto exit;
	}

	if ((info->start_idx + info->count) >
	    info->hmc_info->hmc_obj[info->rsrc_type].cnt) {
		ret_code = I40E_ERR_INVALID_HMC_OBJ_COUNT;
		hw_dbg(hw, "i40e_delete_hmc_object: returns error %d\n",
			  ret_code);
		goto exit;
	}

	I40E_FIND_PD_INDEX_LIMIT(info->hmc_info, info->rsrc_type,
				 info->start_idx, info->count, &pd_idx,
				 &pd_lmt);

	for (j = pd_idx; j < pd_lmt; j++) {
		sd_idx = j / I40E_HMC_PD_CNT_IN_SD;

		if (I40E_SD_TYPE_PAGED !=
		    info->hmc_info->sd_table.sd_entry[sd_idx].entry_type)
			continue;

		rel_pd_idx = j % I40E_HMC_PD_CNT_IN_SD;

		pd_table =
			&info->hmc_info->sd_table.sd_entry[sd_idx].u.pd_table;
		if (pd_table->pd_entry[rel_pd_idx].valid) {
			ret_code = i40e_remove_pd_bp(hw, info->hmc_info, j);
			if (ret_code)
				goto exit;
		}
	}

	/* find sd index and limit */
	I40E_FIND_SD_INDEX_LIMIT(info->hmc_info, info->rsrc_type,
				 info->start_idx, info->count,
				 &sd_idx, &sd_lmt);
	if (sd_idx >= info->hmc_info->sd_table.sd_cnt ||
	    sd_lmt > info->hmc_info->sd_table.sd_cnt) {
		ret_code = I40E_ERR_INVALID_SD_INDEX;
		goto exit;
	}

	for (i = sd_idx; i < sd_lmt; i++) {
		if (!info->hmc_info->sd_table.sd_entry[i].valid)
			continue;
		switch (info->hmc_info->sd_table.sd_entry[i].entry_type) {
		case I40E_SD_TYPE_DIRECT:
			ret_code = i40e_remove_sd_bp(hw, info->hmc_info, i);
			if (ret_code)
				goto exit;
			break;
		case I40E_SD_TYPE_PAGED:
			ret_code = i40e_remove_pd_page(hw, info->hmc_info, i);
			if (ret_code)
				goto exit;
			break;
		default:
			break;
		}
	}
exit:
	return ret_code;
}

/**
 * i40e_shutdown_lan_hmc - Remove HMC backing store, free allocated memory
 * @hw: pointer to the hw structure
 *
 * This must be called by drivers as they are shutting down and being
 * removed from the OS.
 **/
int i40e_shutdown_lan_hmc(struct i40e_hw *hw)
{
	struct i40e_hmc_lan_delete_obj_info info;
	int ret_code;

	info.hmc_info = &hw->hmc;
	info.rsrc_type = I40E_HMC_LAN_FULL;
	info.start_idx = 0;
	info.count = 1;

	/* delete the object */
	ret_code = i40e_delete_lan_hmc_object(hw, &info);

	/* free the SD table entry for LAN */
	i40e_free_virt_mem(hw, &hw->hmc.sd_table.addr);
	hw->hmc.sd_table.sd_cnt = 0;
	hw->hmc.sd_table.sd_entry = NULL;

	/* free memory used for hmc_obj */
	i40e_free_virt_mem(hw, &hw->hmc.hmc_obj_virt_mem);
	hw->hmc.hmc_obj = NULL;

	return ret_code;
}

#define I40E_HMC_STORE(_struct, _ele)		\
	offsetof(struct _struct, _ele),		\
	sizeof_field(struct _struct, _ele)

struct i40e_context_ele {
	u16 offset;
	u16 size_of;
	u16 width;
	u16 lsb;
};

/* LAN Tx Queue Context */
static struct i40e_context_ele i40e_hmc_txq_ce_info[] = {
					     /* Field      Width    LSB */
	{I40E_HMC_STORE(i40e_hmc_obj_txq, head),           13,      0 },
	{I40E_HMC_STORE(i40e_hmc_obj_txq, new_context),     1,     30 },
	{I40E_HMC_STORE(i40e_hmc_obj_txq, base),           57,     32 },
	{I40E_HMC_STORE(i40e_hmc_obj_txq, fc_ena),          1,     89 },
	{I40E_HMC_STORE(i40e_hmc_obj_txq, timesync_ena),    1,     90 },
	{I40E_HMC_STORE(i40e_hmc_obj_txq, fd_ena),          1,     91 },
	{I40E_HMC_STORE(i40e_hmc_obj_txq, alt_vlan_ena),    1,     92 },
	{I40E_HMC_STORE(i40e_hmc_obj_txq, cpuid),           8,     96 },
/* line 1 */
	{I40E_HMC_STORE(i40e_hmc_obj_txq, thead_wb),       13,  0 + 128 },
	{I40E_HMC_STORE(i40e_hmc_obj_txq, head_wb_ena),     1, 32 + 128 },
	{I40E_HMC_STORE(i40e_hmc_obj_txq, qlen),           13, 33 + 128 },
	{I40E_HMC_STORE(i40e_hmc_obj_txq, tphrdesc_ena),    1, 46 + 128 },
	{I40E_HMC_STORE(i40e_hmc_obj_txq, tphrpacket_ena),  1, 47 + 128 },
	{I40E_HMC_STORE(i40e_hmc_obj_txq, tphwdesc_ena),    1, 48 + 128 },
	{I40E_HMC_STORE(i40e_hmc_obj_txq, head_wb_addr),   64, 64 + 128 },
/* line 7 */
	{I40E_HMC_STORE(i40e_hmc_obj_txq, crc),            32,  0 + (7 * 128) },
	{I40E_HMC_STORE(i40e_hmc_obj_txq, rdylist),        10, 84 + (7 * 128) },
	{I40E_HMC_STORE(i40e_hmc_obj_txq, rdylist_act),     1, 94 + (7 * 128) },
	{ 0 }
};

/* LAN Rx Queue Context */
static struct i40e_context_ele i40e_hmc_rxq_ce_info[] = {
					 /* Field      Width    LSB */
	{ I40E_HMC_STORE(i40e_hmc_obj_rxq, head),        13,	0   },
	{ I40E_HMC_STORE(i40e_hmc_obj_rxq, cpuid),        8,	13  },
	{ I40E_HMC_STORE(i40e_hmc_obj_rxq, base),        57,	32  },
	{ I40E_HMC_STORE(i40e_hmc_obj_rxq, qlen),        13,	89  },
	{ I40E_HMC_STORE(i40e_hmc_obj_rxq, dbuff),        7,	102 },
	{ I40E_HMC_STORE(i40e_hmc_obj_rxq, hbuff),        5,	109 },
	{ I40E_HMC_STORE(i40e_hmc_obj_rxq, dtype),        2,	114 },
	{ I40E_HMC_STORE(i40e_hmc_obj_rxq, dsize),        1,	116 },
	{ I40E_HMC_STORE(i40e_hmc_obj_rxq, crcstrip),     1,	117 },
	{ I40E_HMC_STORE(i40e_hmc_obj_rxq, fc_ena),       1,	118 },
	{ I40E_HMC_STORE(i40e_hmc_obj_rxq, l2tsel),       1,	119 },
	{ I40E_HMC_STORE(i40e_hmc_obj_rxq, hsplit_0),     4,	120 },
	{ I40E_HMC_STORE(i40e_hmc_obj_rxq, hsplit_1),     2,	124 },
	{ I40E_HMC_STORE(i40e_hmc_obj_rxq, showiv),       1,	127 },
	{ I40E_HMC_STORE(i40e_hmc_obj_rxq, rxmax),       14,	174 },
	{ I40E_HMC_STORE(i40e_hmc_obj_rxq, tphrdesc_ena), 1,	193 },
	{ I40E_HMC_STORE(i40e_hmc_obj_rxq, tphwdesc_ena), 1,	194 },
	{ I40E_HMC_STORE(i40e_hmc_obj_rxq, tphdata_ena),  1,	195 },
	{ I40E_HMC_STORE(i40e_hmc_obj_rxq, tphhead_ena),  1,	196 },
	{ I40E_HMC_STORE(i40e_hmc_obj_rxq, lrxqthresh),   3,	198 },
	{ I40E_HMC_STORE(i40e_hmc_obj_rxq, prefena),      1,	201 },
	{ 0 }
};

/**
 * i40e_write_byte - replace HMC context byte
 * @hmc_bits: pointer to the HMC memory
 * @ce_info: a description of the struct to be read from
 * @src: the struct to be read from
 **/
static void i40e_write_byte(u8 *hmc_bits,
			    struct i40e_context_ele *ce_info,
			    u8 *src)
{
	u8 src_byte, dest_byte, mask;
	u8 *from, *dest;
	u16 shift_width;

	/* copy from the next struct field */
	from = src + ce_info->offset;

	/* prepare the bits and mask */
	shift_width = ce_info->lsb % 8;
	mask = (u8)(BIT(ce_info->width) - 1);

	src_byte = *from;
	src_byte &= mask;

	/* shift to correct alignment */
	mask <<= shift_width;
	src_byte <<= shift_width;

	/* get the current bits from the target bit string */
	dest = hmc_bits + (ce_info->lsb / 8);

	memcpy(&dest_byte, dest, sizeof(dest_byte));

	dest_byte &= ~mask;	/* get the bits not changing */
	dest_byte |= src_byte;	/* add in the new bits */

	/* put it all back */
	memcpy(dest, &dest_byte, sizeof(dest_byte));
}

/**
 * i40e_write_word - replace HMC context word
 * @hmc_bits: pointer to the HMC memory
 * @ce_info: a description of the struct to be read from
 * @src: the struct to be read from
 **/
static void i40e_write_word(u8 *hmc_bits,
			    struct i40e_context_ele *ce_info,
			    u8 *src)
{
	u16 src_word, mask;
	u8 *from, *dest;
	u16 shift_width;
	__le16 dest_word;

	/* copy from the next struct field */
	from = src + ce_info->offset;

	/* prepare the bits and mask */
	shift_width = ce_info->lsb % 8;
	mask = BIT(ce_info->width) - 1;

	/* don't swizzle the bits until after the mask because the mask bits
	 * will be in a different bit position on big endian machines
	 */
	src_word = *(u16 *)from;
	src_word &= mask;

	/* shift to correct alignment */
	mask <<= shift_width;
	src_word <<= shift_width;

	/* get the current bits from the target bit string */
	dest = hmc_bits + (ce_info->lsb / 8);

	memcpy(&dest_word, dest, sizeof(dest_word));

	dest_word &= ~(cpu_to_le16(mask));	/* get the bits not changing */
	dest_word |= cpu_to_le16(src_word);	/* add in the new bits */

	/* put it all back */
	memcpy(dest, &dest_word, sizeof(dest_word));
}

/**
 * i40e_write_dword - replace HMC context dword
 * @hmc_bits: pointer to the HMC memory
 * @ce_info: a description of the struct to be read from
 * @src: the struct to be read from
 **/
static void i40e_write_dword(u8 *hmc_bits,
			     struct i40e_context_ele *ce_info,
			     u8 *src)
{
	u32 src_dword, mask;
	u8 *from, *dest;
	u16 shift_width;
	__le32 dest_dword;

	/* copy from the next struct field */
	from = src + ce_info->offset;

	/* prepare the bits and mask */
	shift_width = ce_info->lsb % 8;

	/* if the field width is exactly 32 on an x86 machine, then the shift
	 * operation will not work because the SHL instructions count is masked
	 * to 5 bits so the shift will do nothing
	 */
	if (ce_info->width < 32)
		mask = BIT(ce_info->width) - 1;
	else
		mask = ~(u32)0;

	/* don't swizzle the bits until after the mask because the mask bits
	 * will be in a different bit position on big endian machines
	 */
	src_dword = *(u32 *)from;
	src_dword &= mask;

	/* shift to correct alignment */
	mask <<= shift_width;
	src_dword <<= shift_width;

	/* get the current bits from the target bit string */
	dest = hmc_bits + (ce_info->lsb / 8);

	memcpy(&dest_dword, dest, sizeof(dest_dword));

	dest_dword &= ~(cpu_to_le32(mask));	/* get the bits not changing */
	dest_dword |= cpu_to_le32(src_dword);	/* add in the new bits */

	/* put it all back */
	memcpy(dest, &dest_dword, sizeof(dest_dword));
}

/**
 * i40e_write_qword - replace HMC context qword
 * @hmc_bits: pointer to the HMC memory
 * @ce_info: a description of the struct to be read from
 * @src: the struct to be read from
 **/
static void i40e_write_qword(u8 *hmc_bits,
			     struct i40e_context_ele *ce_info,
			     u8 *src)
{
	u64 src_qword, mask;
	u8 *from, *dest;
	u16 shift_width;
	__le64 dest_qword;

	/* copy from the next struct field */
	from = src + ce_info->offset;

	/* prepare the bits and mask */
	shift_width = ce_info->lsb % 8;

	/* if the field width is exactly 64 on an x86 machine, then the shift
	 * operation will not work because the SHL instructions count is masked
	 * to 6 bits so the shift will do nothing
	 */
	if (ce_info->width < 64)
		mask = BIT_ULL(ce_info->width) - 1;
	else
		mask = ~(u64)0;

	/* don't swizzle the bits until after the mask because the mask bits
	 * will be in a different bit position on big endian machines
	 */
	src_qword = *(u64 *)from;
	src_qword &= mask;

	/* shift to correct alignment */
	mask <<= shift_width;
	src_qword <<= shift_width;

	/* get the current bits from the target bit string */
	dest = hmc_bits + (ce_info->lsb / 8);

	memcpy(&dest_qword, dest, sizeof(dest_qword));

	dest_qword &= ~(cpu_to_le64(mask));	/* get the bits not changing */
	dest_qword |= cpu_to_le64(src_qword);	/* add in the new bits */

	/* put it all back */
	memcpy(dest, &dest_qword, sizeof(dest_qword));
}

/**
 * i40e_clear_hmc_context - zero out the HMC context bits
 * @hw:       the hardware struct
 * @context_bytes: pointer to the context bit array (DMA memory)
 * @hmc_type: the type of HMC resource
 **/
static int i40e_clear_hmc_context(struct i40e_hw *hw,
				  u8 *context_bytes,
				  enum i40e_hmc_lan_rsrc_type hmc_type)
{
	/* clean the bit array */
	memset(context_bytes, 0, (u32)hw->hmc.hmc_obj[hmc_type].size);

	return 0;
}

/**
 * i40e_set_hmc_context - replace HMC context bits
 * @context_bytes: pointer to the context bit array
 * @ce_info:  a description of the struct to be filled
 * @dest:     the struct to be filled
 **/
static int i40e_set_hmc_context(u8 *context_bytes,
				struct i40e_context_ele *ce_info,
				u8 *dest)
{
	int f;

	for (f = 0; ce_info[f].width != 0; f++) {

		/* we have to deal with each element of the HMC using the
		 * correct size so that we are correct regardless of the
		 * endianness of the machine
		 */
		switch (ce_info[f].size_of) {
		case 1:
			i40e_write_byte(context_bytes, &ce_info[f], dest);
			break;
		case 2:
			i40e_write_word(context_bytes, &ce_info[f], dest);
			break;
		case 4:
			i40e_write_dword(context_bytes, &ce_info[f], dest);
			break;
		case 8:
			i40e_write_qword(context_bytes, &ce_info[f], dest);
			break;
		}
	}

	return 0;
}

/**
 * i40e_hmc_get_object_va - retrieves an object's virtual address
 * @hw: the hardware struct, from which we obtain the i40e_hmc_info pointer
 * @object_base: pointer to u64 to get the va
 * @rsrc_type: the hmc resource type
 * @obj_idx: hmc object index
 *
 * This function retrieves the object's virtual address from the object
 * base pointer.  This function is used for LAN Queue contexts.
 **/
static
int i40e_hmc_get_object_va(struct i40e_hw *hw, u8 **object_base,
			   enum i40e_hmc_lan_rsrc_type rsrc_type,
			   u32 obj_idx)
{
	struct i40e_hmc_info *hmc_info = &hw->hmc;
	u32 obj_offset_in_sd, obj_offset_in_pd;
	struct i40e_hmc_sd_entry *sd_entry;
	struct i40e_hmc_pd_entry *pd_entry;
	u32 pd_idx, pd_lmt, rel_pd_idx;
	u64 obj_offset_in_fpm;
	u32 sd_idx, sd_lmt;
	int ret_code = 0;

	if (NULL == hmc_info) {
		ret_code = I40E_ERR_BAD_PTR;
		hw_dbg(hw, "i40e_hmc_get_object_va: bad hmc_info ptr\n");
		goto exit;
	}
	if (NULL == hmc_info->hmc_obj) {
		ret_code = I40E_ERR_BAD_PTR;
		hw_dbg(hw, "i40e_hmc_get_object_va: bad hmc_info->hmc_obj ptr\n");
		goto exit;
	}
	if (NULL == object_base) {
		ret_code = I40E_ERR_BAD_PTR;
		hw_dbg(hw, "i40e_hmc_get_object_va: bad object_base ptr\n");
		goto exit;
	}
	if (I40E_HMC_INFO_SIGNATURE != hmc_info->signature) {
		ret_code = I40E_ERR_BAD_PTR;
		hw_dbg(hw, "i40e_hmc_get_object_va: bad hmc_info->signature\n");
		goto exit;
	}
	if (obj_idx >= hmc_info->hmc_obj[rsrc_type].cnt) {
		hw_dbg(hw, "i40e_hmc_get_object_va: returns error %d\n",
			  ret_code);
		ret_code = I40E_ERR_INVALID_HMC_OBJ_INDEX;
		goto exit;
	}
	/* find sd index and limit */
	I40E_FIND_SD_INDEX_LIMIT(hmc_info, rsrc_type, obj_idx, 1,
				 &sd_idx, &sd_lmt);

	sd_entry = &hmc_info->sd_table.sd_entry[sd_idx];
	obj_offset_in_fpm = hmc_info->hmc_obj[rsrc_type].base +
			    hmc_info->hmc_obj[rsrc_type].size * obj_idx;

	if (I40E_SD_TYPE_PAGED == sd_entry->entry_type) {
		I40E_FIND_PD_INDEX_LIMIT(hmc_info, rsrc_type, obj_idx, 1,
					 &pd_idx, &pd_lmt);
		rel_pd_idx = pd_idx % I40E_HMC_PD_CNT_IN_SD;
		pd_entry = &sd_entry->u.pd_table.pd_entry[rel_pd_idx];
		obj_offset_in_pd = (u32)(obj_offset_in_fpm %
					 I40E_HMC_PAGED_BP_SIZE);
		*object_base = (u8 *)pd_entry->bp.addr.va + obj_offset_in_pd;
	} else {
		obj_offset_in_sd = (u32)(obj_offset_in_fpm %
					 I40E_HMC_DIRECT_BP_SIZE);
		*object_base = (u8 *)sd_entry->u.bp.addr.va + obj_offset_in_sd;
	}
exit:
	return ret_code;
}

/**
 * i40e_clear_lan_tx_queue_context - clear the HMC context for the queue
 * @hw:    the hardware struct
 * @queue: the queue we care about
 **/
int i40e_clear_lan_tx_queue_context(struct i40e_hw *hw,
				    u16 queue)
{
	u8 *context_bytes;
	int err;

	err = i40e_hmc_get_object_va(hw, &context_bytes,
				     I40E_HMC_LAN_TX, queue);
	if (err < 0)
		return err;

	return i40e_clear_hmc_context(hw, context_bytes, I40E_HMC_LAN_TX);
}

/**
 * i40e_set_lan_tx_queue_context - set the HMC context for the queue
 * @hw:    the hardware struct
 * @queue: the queue we care about
 * @s:     the struct to be filled
 **/
int i40e_set_lan_tx_queue_context(struct i40e_hw *hw,
				  u16 queue,
				  struct i40e_hmc_obj_txq *s)
{
	u8 *context_bytes;
	int err;

	err = i40e_hmc_get_object_va(hw, &context_bytes,
				     I40E_HMC_LAN_TX, queue);
	if (err < 0)
		return err;

	return i40e_set_hmc_context(context_bytes,
				    i40e_hmc_txq_ce_info, (u8 *)s);
}

/**
 * i40e_clear_lan_rx_queue_context - clear the HMC context for the queue
 * @hw:    the hardware struct
 * @queue: the queue we care about
 **/
int i40e_clear_lan_rx_queue_context(struct i40e_hw *hw,
				    u16 queue)
{
	u8 *context_bytes;
	int err;

	err = i40e_hmc_get_object_va(hw, &context_bytes,
				     I40E_HMC_LAN_RX, queue);
	if (err < 0)
		return err;

	return i40e_clear_hmc_context(hw, context_bytes, I40E_HMC_LAN_RX);
}

/**
 * i40e_set_lan_rx_queue_context - set the HMC context for the queue
 * @hw:    the hardware struct
 * @queue: the queue we care about
 * @s:     the struct to be filled
 **/
int i40e_set_lan_rx_queue_context(struct i40e_hw *hw,
				  u16 queue,
				  struct i40e_hmc_obj_rxq *s)
{
	u8 *context_bytes;
	int err;

	err = i40e_hmc_get_object_va(hw, &context_bytes,
				     I40E_HMC_LAN_RX, queue);
	if (err < 0)
		return err;

	return i40e_set_hmc_context(context_bytes,
				    i40e_hmc_rxq_ce_info, (u8 *)s);
}