/*******************************************************************************
 *
 * 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_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.
 **/
i40e_status 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;
        i40e_status 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 i40e_status i40e_remove_pd_page(struct i40e_hw *hw,
                                                 struct i40e_hmc_info *hmc_info,
                                                 u32 idx)
{
        i40e_status 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 i40e_status i40e_remove_sd_bp(struct i40e_hw *hw,
                                               struct i40e_hmc_info *hmc_info,
                                               u32 idx)
{
        i40e_status 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 i40e_status i40e_create_lan_hmc_object(struct i40e_hw *hw,
                                struct i40e_hmc_lan_create_obj_info *info)
{
        i40e_status ret_code = 0;
        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;
        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.
 **/
i40e_status i40e_configure_lan_hmc(struct i40e_hw *hw,
                                             enum i40e_hmc_model model)
{
        struct i40e_hmc_lan_create_obj_info info;
        i40e_status ret_code = 0;
        u8 hmc_fn_id = hw->hmc.hmc_fn_id;
        struct i40e_hmc_obj_info *obj;

        /* 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_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 i40e_status i40e_delete_lan_hmc_object(struct i40e_hw *hw,
                                struct i40e_hmc_lan_delete_obj_info *info)
{
        i40e_status ret_code = 0;
        struct i40e_hmc_pd_table *pd_table;
        u32 pd_idx, pd_lmt, rel_pd_idx;
        u32 sd_idx, sd_lmt;
        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.
 **/
i40e_status i40e_shutdown_lan_hmc(struct i40e_hw *hw)
{
        struct i40e_hmc_lan_delete_obj_info info;
        i40e_status 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),         \
        FIELD_SIZEOF(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 = 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 i40e_status 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 i40e_status 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
 * @hmc_info: pointer to i40e_hmc_info struct
 * @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
i40e_status i40e_hmc_get_object_va(struct i40e_hmc_info *hmc_info,
                                        u8 **object_base,
                                        enum i40e_hmc_lan_rsrc_type rsrc_type,

                                        u32 obj_idx)
{
        u32 obj_offset_in_sd, obj_offset_in_pd;
        i40e_status ret_code = 0;
        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;

        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
 **/
i40e_status i40e_clear_lan_tx_queue_context(struct i40e_hw *hw,
                                                      u16 queue)
{
        i40e_status err;
        u8 *context_bytes;

        err = i40e_hmc_get_object_va(&hw->hmc, &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
 **/
i40e_status i40e_set_lan_tx_queue_context(struct i40e_hw *hw,
                                                    u16 queue,
                                                    struct i40e_hmc_obj_txq *s)
{
        i40e_status err;
        u8 *context_bytes;

        err = i40e_hmc_get_object_va(&hw->hmc, &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
 **/
i40e_status i40e_clear_lan_rx_queue_context(struct i40e_hw *hw,
                                                      u16 queue)
{
        i40e_status err;
        u8 *context_bytes;

        err = i40e_hmc_get_object_va(&hw->hmc, &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
 **/
i40e_status i40e_set_lan_rx_queue_context(struct i40e_hw *hw,
                                                    u16 queue,
                                                    struct i40e_hmc_obj_rxq *s)
{
        i40e_status err;
        u8 *context_bytes;

        err = i40e_hmc_get_object_va(&hw->hmc, &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);
}