drivers/net/ethernet/intel/i40e/i40e_hmc.c - kernel/lockdown - Git at Google

 /*******************************************************************************
  *
  * Intel Ethernet Controller XL710 Family Linux Driver
  * Copyright(c) 2013 - 2014 Intel Corporation.
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms and conditions of the GNU General Public License,
  * version 2, as published by the Free Software Foundation.
  *
  * This program is distributed in the hope it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  * more details.
  *
  * You should have received a copy of the GNU General Public License along
  * with this program.  If not, see <http://www.gnu.org/licenses/>.
  *
  * The full GNU General Public License is included in this distribution in
  * the file called "COPYING".
  *
  * Contact Information:
  * e1000-devel Mailing List <e1000-devel@lists.sourceforge.net>
  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  *
  ******************************************************************************/

 #include "i40e_osdep.h"
 #include "i40e_register.h"
 #include "i40e_status.h"
 #include "i40e_alloc.h"
 #include "i40e_hmc.h"
 #include "i40e_type.h"

 /**
  * i40e_add_sd_table_entry - Adds a segment descriptor to the table
  * @hw: pointer to our hw struct
  * @hmc_info: pointer to the HMC configuration information struct
  * @sd_index: segment descriptor index to manipulate
  * @type: what type of segment descriptor we're manipulating
  * @direct_mode_sz: size to alloc in direct mode
  **/
 i40e_status i40e_add_sd_table_entry(struct i40e_hw *hw,
 					      struct i40e_hmc_info *hmc_info,
 					      u32 sd_index,
 					      enum i40e_sd_entry_type type,
 					      u64 direct_mode_sz)
 {
 	enum i40e_memory_type mem_type __attribute__((unused));
 	struct i40e_hmc_sd_entry *sd_entry;
 	bool dma_mem_alloc_done = false;
 	struct i40e_dma_mem mem;
 	i40e_status ret_code;
 	u64 alloc_len;

 	if (NULL == hmc_info->sd_table.sd_entry) {
 		ret_code = I40E_ERR_BAD_PTR;
 		hw_dbg(hw, "i40e_add_sd_table_entry: bad sd_entry\n");
 		goto exit;
 	}

 	if (sd_index >= hmc_info->sd_table.sd_cnt) {
 		ret_code = I40E_ERR_INVALID_SD_INDEX;
 		hw_dbg(hw, "i40e_add_sd_table_entry: bad sd_index\n");
 		goto exit;
 	}

 	sd_entry = &hmc_info->sd_table.sd_entry[sd_index];
 	if (!sd_entry->valid) {
 		if (I40E_SD_TYPE_PAGED == type) {
 			mem_type = i40e_mem_pd;
 			alloc_len = I40E_HMC_PAGED_BP_SIZE;
 		} else {
 			mem_type = i40e_mem_bp_jumbo;
 			alloc_len = direct_mode_sz;
 		}

 		/* allocate a 4K pd page or 2M backing page */
 		ret_code = i40e_allocate_dma_mem(hw, &mem, mem_type, alloc_len,
 						 I40E_HMC_PD_BP_BUF_ALIGNMENT);
 		if (ret_code)
 			goto exit;
 		dma_mem_alloc_done = true;
 		if (I40E_SD_TYPE_PAGED == type) {
 			ret_code = i40e_allocate_virt_mem(hw,
 					&sd_entry->u.pd_table.pd_entry_virt_mem,
 					sizeof(struct i40e_hmc_pd_entry) * 512);
 			if (ret_code)
 				goto exit;
 			sd_entry->u.pd_table.pd_entry =
 				(struct i40e_hmc_pd_entry *)
 				sd_entry->u.pd_table.pd_entry_virt_mem.va;
 			sd_entry->u.pd_table.pd_page_addr = mem;
 		} else {
 			sd_entry->u.bp.addr = mem;
 			sd_entry->u.bp.sd_pd_index = sd_index;
 		}
 		/* initialize the sd entry */
 		hmc_info->sd_table.sd_entry[sd_index].entry_type = type;

 		/* increment the ref count */
 		I40E_INC_SD_REFCNT(&hmc_info->sd_table);
 	}
 	/* Increment backing page reference count */
 	if (I40E_SD_TYPE_DIRECT == sd_entry->entry_type)
 		I40E_INC_BP_REFCNT(&sd_entry->u.bp);
 exit:
 	if (ret_code)
 		if (dma_mem_alloc_done)
 			i40e_free_dma_mem(hw, &mem);

 	return ret_code;
 }

 /**
  * i40e_add_pd_table_entry - Adds page descriptor to the specified table
  * @hw: pointer to our HW structure
  * @hmc_info: pointer to the HMC configuration information structure
  * @pd_index: which page descriptor index to manipulate
  *
  * This function:
  *	1. Initializes the pd entry
  *	2. Adds pd_entry in the pd_table
  *	3. Mark the entry valid in i40e_hmc_pd_entry structure
  *	4. Initializes the pd_entry's ref count to 1
  * assumptions:
  *	1. The memory for pd should be pinned down, physically contiguous and
  *	   aligned on 4K boundary and zeroed memory.
  *	2. It should be 4K in size.
  **/
 i40e_status i40e_add_pd_table_entry(struct i40e_hw *hw,
 					      struct i40e_hmc_info *hmc_info,
 					      u32 pd_index)
 {
 	i40e_status ret_code = 0;
 	struct i40e_hmc_pd_table *pd_table;
 	struct i40e_hmc_pd_entry *pd_entry;
 	struct i40e_dma_mem mem;
 	u32 sd_idx, rel_pd_idx;
 	u64 *pd_addr;
 	u64 page_desc;

 	if (pd_index / I40E_HMC_PD_CNT_IN_SD >= hmc_info->sd_table.sd_cnt) {
 		ret_code = I40E_ERR_INVALID_PAGE_DESC_INDEX;
 		hw_dbg(hw, "i40e_add_pd_table_entry: bad pd_index\n");
 		goto exit;
 	}

 	/* find corresponding sd */
 	sd_idx = (pd_index / I40E_HMC_PD_CNT_IN_SD);
 	if (I40E_SD_TYPE_PAGED !=
 	    hmc_info->sd_table.sd_entry[sd_idx].entry_type)
 		goto exit;

 	rel_pd_idx = (pd_index % I40E_HMC_PD_CNT_IN_SD);
 	pd_table = &hmc_info->sd_table.sd_entry[sd_idx].u.pd_table;
 	pd_entry = &pd_table->pd_entry[rel_pd_idx];
 	if (!pd_entry->valid) {
 		/* allocate a 4K backing page */
 		ret_code = i40e_allocate_dma_mem(hw, &mem, i40e_mem_bp,
 						 I40E_HMC_PAGED_BP_SIZE,
 						 I40E_HMC_PD_BP_BUF_ALIGNMENT);
 		if (ret_code)
 			goto exit;

 		pd_entry->bp.addr = mem;
 		pd_entry->bp.sd_pd_index = pd_index;
 		pd_entry->bp.entry_type = I40E_SD_TYPE_PAGED;
 		/* Set page address and valid bit */
 		page_desc = mem.pa | 0x1;

 		pd_addr = (u64 *)pd_table->pd_page_addr.va;
 		pd_addr += rel_pd_idx;

 		/* Add the backing page physical address in the pd entry */
 		memcpy(pd_addr, &page_desc, sizeof(u64));

 		pd_entry->sd_index = sd_idx;
 		pd_entry->valid = true;
 		I40E_INC_PD_REFCNT(pd_table);
 	}
 	I40E_INC_BP_REFCNT(&pd_entry->bp);
 exit:
 	return ret_code;
 }

 /**
  * i40e_remove_pd_bp - remove a backing page from a page descriptor
  * @hw: pointer to our HW structure
  * @hmc_info: pointer to the HMC configuration information structure
  * @idx: the page index
  * @is_pf: distinguishes a VF from a PF
  *
  * This function:
  *	1. Marks the entry in pd tabe (for paged address mode) or in sd table
  *	   (for direct address mode) invalid.
  *	2. Write to register PMPDINV to invalidate the backing page in FV cache
  *	3. Decrement the ref count for the pd _entry
  * assumptions:
  *	1. Caller can deallocate the memory used by backing storage after this
  *	   function returns.
  **/
 i40e_status i40e_remove_pd_bp(struct i40e_hw *hw,
 					struct i40e_hmc_info *hmc_info,
 					u32 idx)
 {
 	i40e_status ret_code = 0;
 	struct i40e_hmc_pd_entry *pd_entry;
 	struct i40e_hmc_pd_table *pd_table;
 	struct i40e_hmc_sd_entry *sd_entry;
 	u32 sd_idx, rel_pd_idx;
 	u64 *pd_addr;

 	/* calculate index */
 	sd_idx = idx / I40E_HMC_PD_CNT_IN_SD;
 	rel_pd_idx = idx % I40E_HMC_PD_CNT_IN_SD;
 	if (sd_idx >= hmc_info->sd_table.sd_cnt) {
 		ret_code = I40E_ERR_INVALID_PAGE_DESC_INDEX;
 		hw_dbg(hw, "i40e_remove_pd_bp: bad idx\n");
 		goto exit;
 	}
 	sd_entry = &hmc_info->sd_table.sd_entry[sd_idx];
 	if (I40E_SD_TYPE_PAGED != sd_entry->entry_type) {
 		ret_code = I40E_ERR_INVALID_SD_TYPE;
 		hw_dbg(hw, "i40e_remove_pd_bp: wrong sd_entry type\n");
 		goto exit;
 	}
 	/* get the entry and decrease its ref counter */
 	pd_table = &hmc_info->sd_table.sd_entry[sd_idx].u.pd_table;
 	pd_entry = &pd_table->pd_entry[rel_pd_idx];
 	I40E_DEC_BP_REFCNT(&pd_entry->bp);
 	if (pd_entry->bp.ref_cnt)
 		goto exit;

 	/* mark the entry invalid */
 	pd_entry->valid = false;
 	I40E_DEC_PD_REFCNT(pd_table);
 	pd_addr = (u64 *)pd_table->pd_page_addr.va;
 	pd_addr += rel_pd_idx;
 	memset(pd_addr, 0, sizeof(u64));
 	I40E_INVALIDATE_PF_HMC_PD(hw, sd_idx, idx);

 	/* free memory here */
 	ret_code = i40e_free_dma_mem(hw, &(pd_entry->bp.addr));
 	if (ret_code)
 		goto exit;
 	if (!pd_table->ref_cnt)
 		i40e_free_virt_mem(hw, &pd_table->pd_entry_virt_mem);
 exit:
 	return ret_code;
 }

 /**
  * i40e_prep_remove_sd_bp - Prepares to remove a backing page from a sd entry
  * @hmc_info: pointer to the HMC configuration information structure
  * @idx: the page index
  **/
 i40e_status i40e_prep_remove_sd_bp(struct i40e_hmc_info *hmc_info,
 					     u32 idx)
 {
 	i40e_status ret_code = 0;
 	struct i40e_hmc_sd_entry *sd_entry;

 	/* get the entry and decrease its ref counter */
 	sd_entry = &hmc_info->sd_table.sd_entry[idx];
 	I40E_DEC_BP_REFCNT(&sd_entry->u.bp);
 	if (sd_entry->u.bp.ref_cnt) {
 		ret_code = I40E_ERR_NOT_READY;
 		goto exit;
 	}
 	I40E_DEC_SD_REFCNT(&hmc_info->sd_table);

 	/* mark the entry invalid */
 	sd_entry->valid = false;
 exit:
 	return ret_code;
 }

 /**
  * i40e_remove_sd_bp_new - Removes a backing page from a segment descriptor
  * @hw: pointer to our hw struct
  * @hmc_info: pointer to the HMC configuration information structure
  * @idx: the page index
  * @is_pf: used to distinguish between VF and PF
  **/
 i40e_status i40e_remove_sd_bp_new(struct i40e_hw *hw,
 					    struct i40e_hmc_info *hmc_info,
 					    u32 idx, bool is_pf)
 {
 	struct i40e_hmc_sd_entry *sd_entry;
 	i40e_status ret_code = 0;

 	/* get the entry and decrease its ref counter */
 	sd_entry = &hmc_info->sd_table.sd_entry[idx];
 	if (is_pf) {
 		I40E_CLEAR_PF_SD_ENTRY(hw, idx, I40E_SD_TYPE_DIRECT);
 	} else {
 		ret_code = I40E_NOT_SUPPORTED;
 		goto exit;
 	}
 	ret_code = i40e_free_dma_mem(hw, &(sd_entry->u.bp.addr));
 	if (ret_code)
 		goto exit;
 exit:
 	return ret_code;
 }

 /**
  * i40e_prep_remove_pd_page - Prepares to remove a PD page from sd entry.
  * @hmc_info: pointer to the HMC configuration information structure
  * @idx: segment descriptor index to find the relevant page descriptor
  **/
 i40e_status i40e_prep_remove_pd_page(struct i40e_hmc_info *hmc_info,
 					       u32 idx)
 {
 	i40e_status ret_code = 0;
 	struct i40e_hmc_sd_entry *sd_entry;

 	sd_entry = &hmc_info->sd_table.sd_entry[idx];

 	if (sd_entry->u.pd_table.ref_cnt) {
 		ret_code = I40E_ERR_NOT_READY;
 		goto exit;
 	}

 	/* mark the entry invalid */
 	sd_entry->valid = false;

 	I40E_DEC_SD_REFCNT(&hmc_info->sd_table);
 exit:
 	return ret_code;
 }

 /**
  * i40e_remove_pd_page_new - Removes a PD page from sd entry.
  * @hw: pointer to our hw struct
  * @hmc_info: pointer to the HMC configuration information structure
  * @idx: segment descriptor index to find the relevant page descriptor
  * @is_pf: used to distinguish between VF and PF
  **/
 i40e_status i40e_remove_pd_page_new(struct i40e_hw *hw,
 					      struct i40e_hmc_info *hmc_info,
 					      u32 idx, bool is_pf)
 {
 	i40e_status ret_code = 0;
 	struct i40e_hmc_sd_entry *sd_entry;

 	sd_entry = &hmc_info->sd_table.sd_entry[idx];
 	if (is_pf) {
 		I40E_CLEAR_PF_SD_ENTRY(hw, idx, I40E_SD_TYPE_PAGED);
 	} else {
 		ret_code = I40E_NOT_SUPPORTED;
 		goto exit;
 	}
 	/* free memory here */
 	ret_code = i40e_free_dma_mem(hw, &(sd_entry->u.pd_table.pd_page_addr));
 	if (ret_code)
 		goto exit;
 exit:
 	return ret_code;
 }
	/*******************************************************************************
	*
	* Intel Ethernet Controller XL710 Family Linux Driver
	* Copyright(c) 2013 - 2014 Intel Corporation.
	*
	* This program is free software; you can redistribute it and/or modify it
	* under the terms and conditions of the GNU General Public License,
	* version 2, as published by the Free Software Foundation.
	*
	* This program is distributed in the hope it will be useful, but WITHOUT
	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
	* more details.
	*
	* You should have received a copy of the GNU General Public License along
	* with this program. If not, see <http://www.gnu.org/licenses/>.
	*
	* The full GNU General Public License is included in this distribution in
	* the file called "COPYING".
	*
	* Contact Information:
	* e1000-devel Mailing List <e1000-devel@lists.sourceforge.net>
	* Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
	*
	******************************************************************************/

	#include "i40e_osdep.h"
	#include "i40e_register.h"
	#include "i40e_status.h"
	#include "i40e_alloc.h"
	#include "i40e_hmc.h"
	#include "i40e_type.h"

	/**
	* i40e_add_sd_table_entry - Adds a segment descriptor to the table
	* @hw: pointer to our hw struct
	* @hmc_info: pointer to the HMC configuration information struct
	* @sd_index: segment descriptor index to manipulate
	* @type: what type of segment descriptor we're manipulating
	* @direct_mode_sz: size to alloc in direct mode
	**/
	i40e_status i40e_add_sd_table_entry(struct i40e_hw *hw,
	struct i40e_hmc_info *hmc_info,
	u32 sd_index,
	enum i40e_sd_entry_type type,
	u64 direct_mode_sz)
	{
	enum i40e_memory_type mem_type __attribute__((unused));
	struct i40e_hmc_sd_entry *sd_entry;
	bool dma_mem_alloc_done = false;
	struct i40e_dma_mem mem;
	i40e_status ret_code;
	u64 alloc_len;

	if (NULL == hmc_info->sd_table.sd_entry) {
	ret_code = I40E_ERR_BAD_PTR;
	hw_dbg(hw, "i40e_add_sd_table_entry: bad sd_entry\n");
	goto exit;
	}

	if (sd_index >= hmc_info->sd_table.sd_cnt) {
	ret_code = I40E_ERR_INVALID_SD_INDEX;
	hw_dbg(hw, "i40e_add_sd_table_entry: bad sd_index\n");
	goto exit;
	}

	sd_entry = &hmc_info->sd_table.sd_entry[sd_index];
	if (!sd_entry->valid) {
	if (I40E_SD_TYPE_PAGED == type) {
	mem_type = i40e_mem_pd;
	alloc_len = I40E_HMC_PAGED_BP_SIZE;
	} else {
	mem_type = i40e_mem_bp_jumbo;
	alloc_len = direct_mode_sz;
	}

	/* allocate a 4K pd page or 2M backing page */
	ret_code = i40e_allocate_dma_mem(hw, &mem, mem_type, alloc_len,
	I40E_HMC_PD_BP_BUF_ALIGNMENT);
	if (ret_code)
	goto exit;
	dma_mem_alloc_done = true;
	if (I40E_SD_TYPE_PAGED == type) {
	ret_code = i40e_allocate_virt_mem(hw,
	&sd_entry->u.pd_table.pd_entry_virt_mem,
	sizeof(struct i40e_hmc_pd_entry) * 512);
	if (ret_code)
	goto exit;
	sd_entry->u.pd_table.pd_entry =
	(struct i40e_hmc_pd_entry *)
	sd_entry->u.pd_table.pd_entry_virt_mem.va;
	sd_entry->u.pd_table.pd_page_addr = mem;
	} else {
	sd_entry->u.bp.addr = mem;
	sd_entry->u.bp.sd_pd_index = sd_index;
	}
	/* initialize the sd entry */
	hmc_info->sd_table.sd_entry[sd_index].entry_type = type;

	/* increment the ref count */
	I40E_INC_SD_REFCNT(&hmc_info->sd_table);
	}
	/* Increment backing page reference count */
	if (I40E_SD_TYPE_DIRECT == sd_entry->entry_type)
	I40E_INC_BP_REFCNT(&sd_entry->u.bp);
	exit:
	if (ret_code)
	if (dma_mem_alloc_done)
	i40e_free_dma_mem(hw, &mem);

	return ret_code;
	}

	/**
	* i40e_add_pd_table_entry - Adds page descriptor to the specified table
	* @hw: pointer to our HW structure
	* @hmc_info: pointer to the HMC configuration information structure
	* @pd_index: which page descriptor index to manipulate
	*
	* This function:
	* 1. Initializes the pd entry
	* 2. Adds pd_entry in the pd_table
	* 3. Mark the entry valid in i40e_hmc_pd_entry structure
	* 4. Initializes the pd_entry's ref count to 1
	* assumptions:
	* 1. The memory for pd should be pinned down, physically contiguous and
	* aligned on 4K boundary and zeroed memory.
	* 2. It should be 4K in size.
	**/
	i40e_status i40e_add_pd_table_entry(struct i40e_hw *hw,
	struct i40e_hmc_info *hmc_info,
	u32 pd_index)
	{
	i40e_status ret_code = 0;
	struct i40e_hmc_pd_table *pd_table;
	struct i40e_hmc_pd_entry *pd_entry;
	struct i40e_dma_mem mem;
	u32 sd_idx, rel_pd_idx;
	u64 *pd_addr;
	u64 page_desc;

	if (pd_index / I40E_HMC_PD_CNT_IN_SD >= hmc_info->sd_table.sd_cnt) {
	ret_code = I40E_ERR_INVALID_PAGE_DESC_INDEX;
	hw_dbg(hw, "i40e_add_pd_table_entry: bad pd_index\n");
	goto exit;
	}

	/* find corresponding sd */
	sd_idx = (pd_index / I40E_HMC_PD_CNT_IN_SD);
	if (I40E_SD_TYPE_PAGED !=
	hmc_info->sd_table.sd_entry[sd_idx].entry_type)
	goto exit;

	rel_pd_idx = (pd_index % I40E_HMC_PD_CNT_IN_SD);
	pd_table = &hmc_info->sd_table.sd_entry[sd_idx].u.pd_table;
	pd_entry = &pd_table->pd_entry[rel_pd_idx];
	if (!pd_entry->valid) {
	/* allocate a 4K backing page */
	ret_code = i40e_allocate_dma_mem(hw, &mem, i40e_mem_bp,
	I40E_HMC_PAGED_BP_SIZE,
	I40E_HMC_PD_BP_BUF_ALIGNMENT);
	if (ret_code)
	goto exit;

	pd_entry->bp.addr = mem;
	pd_entry->bp.sd_pd_index = pd_index;
	pd_entry->bp.entry_type = I40E_SD_TYPE_PAGED;
	/* Set page address and valid bit */
	page_desc = mem.pa \| 0x1;

	pd_addr = (u64 *)pd_table->pd_page_addr.va;
	pd_addr += rel_pd_idx;

	/* Add the backing page physical address in the pd entry */
	memcpy(pd_addr, &page_desc, sizeof(u64));

	pd_entry->sd_index = sd_idx;
	pd_entry->valid = true;
	I40E_INC_PD_REFCNT(pd_table);
	}
	I40E_INC_BP_REFCNT(&pd_entry->bp);
	exit:
	return ret_code;
	}

	/**
	* i40e_remove_pd_bp - remove a backing page from a page descriptor
	* @hw: pointer to our HW structure
	* @hmc_info: pointer to the HMC configuration information structure
	* @idx: the page index
	* @is_pf: distinguishes a VF from a PF
	*
	* This function:
	* 1. Marks the entry in pd tabe (for paged address mode) or in sd table
	* (for direct address mode) invalid.
	* 2. Write to register PMPDINV to invalidate the backing page in FV cache
	* 3. Decrement the ref count for the pd _entry
	* assumptions:
	* 1. Caller can deallocate the memory used by backing storage after this
	* function returns.
	**/
	i40e_status i40e_remove_pd_bp(struct i40e_hw *hw,
	struct i40e_hmc_info *hmc_info,
	u32 idx)
	{
	i40e_status ret_code = 0;
	struct i40e_hmc_pd_entry *pd_entry;
	struct i40e_hmc_pd_table *pd_table;
	struct i40e_hmc_sd_entry *sd_entry;
	u32 sd_idx, rel_pd_idx;
	u64 *pd_addr;

	/* calculate index */
	sd_idx = idx / I40E_HMC_PD_CNT_IN_SD;
	rel_pd_idx = idx % I40E_HMC_PD_CNT_IN_SD;
	if (sd_idx >= hmc_info->sd_table.sd_cnt) {
	ret_code = I40E_ERR_INVALID_PAGE_DESC_INDEX;
	hw_dbg(hw, "i40e_remove_pd_bp: bad idx\n");
	goto exit;
	}
	sd_entry = &hmc_info->sd_table.sd_entry[sd_idx];
	if (I40E_SD_TYPE_PAGED != sd_entry->entry_type) {
	ret_code = I40E_ERR_INVALID_SD_TYPE;
	hw_dbg(hw, "i40e_remove_pd_bp: wrong sd_entry type\n");
	goto exit;
	}
	/* get the entry and decrease its ref counter */
	pd_table = &hmc_info->sd_table.sd_entry[sd_idx].u.pd_table;
	pd_entry = &pd_table->pd_entry[rel_pd_idx];
	I40E_DEC_BP_REFCNT(&pd_entry->bp);
	if (pd_entry->bp.ref_cnt)
	goto exit;

	/* mark the entry invalid */
	pd_entry->valid = false;
	I40E_DEC_PD_REFCNT(pd_table);
	pd_addr = (u64 *)pd_table->pd_page_addr.va;
	pd_addr += rel_pd_idx;
	memset(pd_addr, 0, sizeof(u64));
	I40E_INVALIDATE_PF_HMC_PD(hw, sd_idx, idx);

	/* free memory here */
	ret_code = i40e_free_dma_mem(hw, &(pd_entry->bp.addr));
	if (ret_code)
	goto exit;
	if (!pd_table->ref_cnt)
	i40e_free_virt_mem(hw, &pd_table->pd_entry_virt_mem);
	exit:
	return ret_code;
	}

	/**
	* i40e_prep_remove_sd_bp - Prepares to remove a backing page from a sd entry
	* @hmc_info: pointer to the HMC configuration information structure
	* @idx: the page index
	**/
	i40e_status i40e_prep_remove_sd_bp(struct i40e_hmc_info *hmc_info,
	u32 idx)
	{
	i40e_status ret_code = 0;
	struct i40e_hmc_sd_entry *sd_entry;

	/* get the entry and decrease its ref counter */
	sd_entry = &hmc_info->sd_table.sd_entry[idx];
	I40E_DEC_BP_REFCNT(&sd_entry->u.bp);
	if (sd_entry->u.bp.ref_cnt) {
	ret_code = I40E_ERR_NOT_READY;
	goto exit;
	}
	I40E_DEC_SD_REFCNT(&hmc_info->sd_table);

	/* mark the entry invalid */
	sd_entry->valid = false;
	exit:
	return ret_code;
	}

	/**
	* i40e_remove_sd_bp_new - Removes a backing page from a segment descriptor
	* @hw: pointer to our hw struct
	* @hmc_info: pointer to the HMC configuration information structure
	* @idx: the page index
	* @is_pf: used to distinguish between VF and PF
	**/
	i40e_status i40e_remove_sd_bp_new(struct i40e_hw *hw,
	struct i40e_hmc_info *hmc_info,
	u32 idx, bool is_pf)
	{
	struct i40e_hmc_sd_entry *sd_entry;
	i40e_status ret_code = 0;

	/* get the entry and decrease its ref counter */
	sd_entry = &hmc_info->sd_table.sd_entry[idx];
	if (is_pf) {
	I40E_CLEAR_PF_SD_ENTRY(hw, idx, I40E_SD_TYPE_DIRECT);
	} else {
	ret_code = I40E_NOT_SUPPORTED;
	goto exit;
	}
	ret_code = i40e_free_dma_mem(hw, &(sd_entry->u.bp.addr));
	if (ret_code)
	goto exit;
	exit:
	return ret_code;
	}

	/**
	* i40e_prep_remove_pd_page - Prepares to remove a PD page from sd entry.
	* @hmc_info: pointer to the HMC configuration information structure
	* @idx: segment descriptor index to find the relevant page descriptor
	**/
	i40e_status i40e_prep_remove_pd_page(struct i40e_hmc_info *hmc_info,
	u32 idx)
	{
	i40e_status ret_code = 0;
	struct i40e_hmc_sd_entry *sd_entry;

	sd_entry = &hmc_info->sd_table.sd_entry[idx];

	if (sd_entry->u.pd_table.ref_cnt) {
	ret_code = I40E_ERR_NOT_READY;
	goto exit;
	}

	/* mark the entry invalid */
	sd_entry->valid = false;

	I40E_DEC_SD_REFCNT(&hmc_info->sd_table);
	exit:
	return ret_code;
	}

	/**
	* i40e_remove_pd_page_new - Removes a PD page from sd entry.
	* @hw: pointer to our hw struct
	* @hmc_info: pointer to the HMC configuration information structure
	* @idx: segment descriptor index to find the relevant page descriptor
	* @is_pf: used to distinguish between VF and PF
	**/
	i40e_status i40e_remove_pd_page_new(struct i40e_hw *hw,
	struct i40e_hmc_info *hmc_info,
	u32 idx, bool is_pf)
	{
	i40e_status ret_code = 0;
	struct i40e_hmc_sd_entry *sd_entry;

	sd_entry = &hmc_info->sd_table.sd_entry[idx];
	if (is_pf) {
	I40E_CLEAR_PF_SD_ENTRY(hw, idx, I40E_SD_TYPE_PAGED);
	} else {
	ret_code = I40E_NOT_SUPPORTED;
	goto exit;
	}
	/* free memory here */
	ret_code = i40e_free_dma_mem(hw, &(sd_entry->u.pd_table.pd_page_addr));
	if (ret_code)
	goto exit;
	exit:
	return ret_code;
	}