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

#include "i40e_prototype.h"

/**
 * i40e_init_nvm_ops - Initialize NVM function pointers
 * @hw: pointer to the HW structure
 *
 * Setup the function pointers and the NVM info structure. Should be called
 * once per NVM initialization, e.g. inside the i40e_init_shared_code().
 * Please notice that the NVM term is used here (& in all methods covered
 * in this file) as an equivalent of the FLASH part mapped into the SR.
 * We are accessing FLASH always thru the Shadow RAM.
 **/
i40e_status i40e_init_nvm(struct i40e_hw *hw)
{
        struct i40e_nvm_info *nvm = &hw->nvm;
        i40e_status ret_code = 0;
        u32 fla, gens;
        u8 sr_size;

        /* The SR size is stored regardless of the nvm programming mode
         * as the blank mode may be used in the factory line.
         */
        gens = rd32(hw, I40E_GLNVM_GENS);
        sr_size = ((gens & I40E_GLNVM_GENS_SR_SIZE_MASK) >>
                           I40E_GLNVM_GENS_SR_SIZE_SHIFT);
        /* Switching to words (sr_size contains power of 2KB) */
        nvm->sr_size = BIT(sr_size) * I40E_SR_WORDS_IN_1KB;

        /* Check if we are in the normal or blank NVM programming mode */
        fla = rd32(hw, I40E_GLNVM_FLA);
        if (fla & I40E_GLNVM_FLA_LOCKED_MASK) { /* Normal programming mode */
                /* Max NVM timeout */
                nvm->timeout = I40E_MAX_NVM_TIMEOUT;
                nvm->blank_nvm_mode = false;
        } else { /* Blank programming mode */
                nvm->blank_nvm_mode = true;
                ret_code = I40E_ERR_NVM_BLANK_MODE;
                i40e_debug(hw, I40E_DEBUG_NVM, "NVM init error: unsupported blank mode.\n");
        }

        return ret_code;
}

/**
 * i40e_acquire_nvm - Generic request for acquiring the NVM ownership
 * @hw: pointer to the HW structure
 * @access: NVM access type (read or write)
 *
 * This function will request NVM ownership for reading
 * via the proper Admin Command.
 **/
i40e_status i40e_acquire_nvm(struct i40e_hw *hw,
                                       enum i40e_aq_resource_access_type access)
{
        i40e_status ret_code = 0;
        u64 gtime, timeout;
        u64 time_left = 0;

        if (hw->nvm.blank_nvm_mode)
                goto i40e_i40e_acquire_nvm_exit;

        ret_code = i40e_aq_request_resource(hw, I40E_NVM_RESOURCE_ID, access,
                                            0, &time_left, NULL);
        /* Reading the Global Device Timer */
        gtime = rd32(hw, I40E_GLVFGEN_TIMER);

        /* Store the timeout */
        hw->nvm.hw_semaphore_timeout = I40E_MS_TO_GTIME(time_left) + gtime;

        if (ret_code)
                i40e_debug(hw, I40E_DEBUG_NVM,
                           "NVM acquire type %d failed time_left=%llu ret=%d aq_err=%d\n",
                           access, time_left, ret_code, hw->aq.asq_last_status);

        if (ret_code && time_left) {
                /* Poll until the current NVM owner timeouts */
                timeout = I40E_MS_TO_GTIME(I40E_MAX_NVM_TIMEOUT) + gtime;
                while ((gtime < timeout) && time_left) {
                        usleep_range(10000, 20000);
                        gtime = rd32(hw, I40E_GLVFGEN_TIMER);
                        ret_code = i40e_aq_request_resource(hw,
                                                        I40E_NVM_RESOURCE_ID,
                                                        access, 0, &time_left,
                                                        NULL);
                        if (!ret_code) {
                                hw->nvm.hw_semaphore_timeout =
                                            I40E_MS_TO_GTIME(time_left) + gtime;
                                break;
                        }
                }
                if (ret_code) {
                        hw->nvm.hw_semaphore_timeout = 0;
                        i40e_debug(hw, I40E_DEBUG_NVM,
                                   "NVM acquire timed out, wait %llu ms before trying again. status=%d aq_err=%d\n",
                                   time_left, ret_code, hw->aq.asq_last_status);
                }
        }

i40e_i40e_acquire_nvm_exit:
        return ret_code;
}

/**
 * i40e_release_nvm - Generic request for releasing the NVM ownership
 * @hw: pointer to the HW structure
 *
 * This function will release NVM resource via the proper Admin Command.
 **/
void i40e_release_nvm(struct i40e_hw *hw)
{
        i40e_status ret_code = I40E_SUCCESS;
        u32 total_delay = 0;

        if (hw->nvm.blank_nvm_mode)
                return;

        ret_code = i40e_aq_release_resource(hw, I40E_NVM_RESOURCE_ID, 0, NULL);

        /* there are some rare cases when trying to release the resource
         * results in an admin Q timeout, so handle them correctly
         */
        while ((ret_code == I40E_ERR_ADMIN_QUEUE_TIMEOUT) &&
               (total_delay < hw->aq.asq_cmd_timeout)) {
                usleep_range(1000, 2000);
                ret_code = i40e_aq_release_resource(hw,
                                                    I40E_NVM_RESOURCE_ID,
                                                    0, NULL);
                total_delay++;
        }
}

/**
 * i40e_poll_sr_srctl_done_bit - Polls the GLNVM_SRCTL done bit
 * @hw: pointer to the HW structure
 *
 * Polls the SRCTL Shadow RAM register done bit.
 **/
static i40e_status i40e_poll_sr_srctl_done_bit(struct i40e_hw *hw)
{
        i40e_status ret_code = I40E_ERR_TIMEOUT;
        u32 srctl, wait_cnt;

        /* Poll the I40E_GLNVM_SRCTL until the done bit is set */
        for (wait_cnt = 0; wait_cnt < I40E_SRRD_SRCTL_ATTEMPTS; wait_cnt++) {
                srctl = rd32(hw, I40E_GLNVM_SRCTL);
                if (srctl & I40E_GLNVM_SRCTL_DONE_MASK) {
                        ret_code = 0;
                        break;
                }
                udelay(5);
        }
        if (ret_code == I40E_ERR_TIMEOUT)
                i40e_debug(hw, I40E_DEBUG_NVM, "Done bit in GLNVM_SRCTL not set");
        return ret_code;
}

/**
 * i40e_read_nvm_word_srctl - Reads Shadow RAM via SRCTL register
 * @hw: pointer to the HW structure
 * @offset: offset of the Shadow RAM word to read (0x000000 - 0x001FFF)
 * @data: word read from the Shadow RAM
 *
 * Reads one 16 bit word from the Shadow RAM using the GLNVM_SRCTL register.
 **/
static i40e_status i40e_read_nvm_word_srctl(struct i40e_hw *hw, u16 offset,
                                            u16 *data)
{
        i40e_status ret_code = I40E_ERR_TIMEOUT;
        u32 sr_reg;

        if (offset >= hw->nvm.sr_size) {
                i40e_debug(hw, I40E_DEBUG_NVM,
                           "NVM read error: offset %d beyond Shadow RAM limit %d\n",
                           offset, hw->nvm.sr_size);
                ret_code = I40E_ERR_PARAM;
                goto read_nvm_exit;
        }

        /* Poll the done bit first */
        ret_code = i40e_poll_sr_srctl_done_bit(hw);
        if (!ret_code) {
                /* Write the address and start reading */
                sr_reg = ((u32)offset << I40E_GLNVM_SRCTL_ADDR_SHIFT) |
                         BIT(I40E_GLNVM_SRCTL_START_SHIFT);
                wr32(hw, I40E_GLNVM_SRCTL, sr_reg);

                /* Poll I40E_GLNVM_SRCTL until the done bit is set */
                ret_code = i40e_poll_sr_srctl_done_bit(hw);
                if (!ret_code) {
                        sr_reg = rd32(hw, I40E_GLNVM_SRDATA);
                        *data = (u16)((sr_reg &
                                       I40E_GLNVM_SRDATA_RDDATA_MASK)
                                    >> I40E_GLNVM_SRDATA_RDDATA_SHIFT);
                }
        }
        if (ret_code)
                i40e_debug(hw, I40E_DEBUG_NVM,
                           "NVM read error: Couldn't access Shadow RAM address: 0x%x\n",
                           offset);

read_nvm_exit:
        return ret_code;
}

/**
 * i40e_read_nvm_aq - Read Shadow RAM.
 * @hw: pointer to the HW structure.
 * @module_pointer: module pointer location in words from the NVM beginning
 * @offset: offset in words from module start
 * @words: number of words to write
 * @data: buffer with words to write to the Shadow RAM
 * @last_command: tells the AdminQ that this is the last command
 *
 * Writes a 16 bit words buffer to the Shadow RAM using the admin command.
 **/
static i40e_status i40e_read_nvm_aq(struct i40e_hw *hw,
                                    u8 module_pointer, u32 offset,
                                    u16 words, void *data,
                                    bool last_command)
{
        i40e_status ret_code = I40E_ERR_NVM;
        struct i40e_asq_cmd_details cmd_details;

        memset(&cmd_details, 0, sizeof(cmd_details));
        cmd_details.wb_desc = &hw->nvm_wb_desc;

        /* Here we are checking the SR limit only for the flat memory model.
         * We cannot do it for the module-based model, as we did not acquire
         * the NVM resource yet (we cannot get the module pointer value).
         * Firmware will check the module-based model.
         */
        if ((offset + words) > hw->nvm.sr_size)
                i40e_debug(hw, I40E_DEBUG_NVM,
                           "NVM write error: offset %d beyond Shadow RAM limit %d\n",
                           (offset + words), hw->nvm.sr_size);
        else if (words > I40E_SR_SECTOR_SIZE_IN_WORDS)
                /* We can write only up to 4KB (one sector), in one AQ write */
                i40e_debug(hw, I40E_DEBUG_NVM,
                           "NVM write fail error: tried to write %d words, limit is %d.\n",
                           words, I40E_SR_SECTOR_SIZE_IN_WORDS);
        else if (((offset + (words - 1)) / I40E_SR_SECTOR_SIZE_IN_WORDS)
                 != (offset / I40E_SR_SECTOR_SIZE_IN_WORDS))
                /* A single write cannot spread over two sectors */
                i40e_debug(hw, I40E_DEBUG_NVM,
                           "NVM write error: cannot spread over two sectors in a single write offset=%d words=%d\n",
                           offset, words);
        else
                ret_code = i40e_aq_read_nvm(hw, module_pointer,
                                            2 * offset,  /*bytes*/
                                            2 * words,   /*bytes*/
                                            data, last_command, &cmd_details);

        return ret_code;
}

/**
 * i40e_read_nvm_word_aq - Reads Shadow RAM via AQ
 * @hw: pointer to the HW structure
 * @offset: offset of the Shadow RAM word to read (0x000000 - 0x001FFF)
 * @data: word read from the Shadow RAM
 *
 * Reads one 16 bit word from the Shadow RAM using the AdminQ
 **/
static i40e_status i40e_read_nvm_word_aq(struct i40e_hw *hw, u16 offset,
                                         u16 *data)
{
        i40e_status ret_code = I40E_ERR_TIMEOUT;

        ret_code = i40e_read_nvm_aq(hw, 0x0, offset, 1, data, true);
        *data = le16_to_cpu(*(__le16 *)data);

        return ret_code;
}

/**
 * __i40e_read_nvm_word - Reads nvm word, assumes caller does the locking
 * @hw: pointer to the HW structure
 * @offset: offset of the Shadow RAM word to read (0x000000 - 0x001FFF)
 * @data: word read from the Shadow RAM
 *
 * Reads one 16 bit word from the Shadow RAM.
 *
 * Do not use this function except in cases where the nvm lock is already
 * taken via i40e_acquire_nvm().
 **/
static i40e_status __i40e_read_nvm_word(struct i40e_hw *hw,
                                        u16 offset, u16 *data)
{
        if (hw->flags & I40E_HW_FLAG_AQ_SRCTL_ACCESS_ENABLE)
                return i40e_read_nvm_word_aq(hw, offset, data);

        return i40e_read_nvm_word_srctl(hw, offset, data);
}

/**
 * i40e_read_nvm_word - Reads nvm word and acquire lock if necessary
 * @hw: pointer to the HW structure
 * @offset: offset of the Shadow RAM word to read (0x000000 - 0x001FFF)
 * @data: word read from the Shadow RAM
 *
 * Reads one 16 bit word from the Shadow RAM.
 **/
i40e_status i40e_read_nvm_word(struct i40e_hw *hw, u16 offset,
                               u16 *data)
{
        i40e_status ret_code = 0;

        if (hw->flags & I40E_HW_FLAG_NVM_READ_REQUIRES_LOCK)
                ret_code = i40e_acquire_nvm(hw, I40E_RESOURCE_READ);
        if (ret_code)
                return ret_code;

        ret_code = __i40e_read_nvm_word(hw, offset, data);

        if (hw->flags & I40E_HW_FLAG_NVM_READ_REQUIRES_LOCK)
                i40e_release_nvm(hw);

        return ret_code;
}

/**
 * i40e_read_nvm_buffer_srctl - Reads Shadow RAM buffer via SRCTL register
 * @hw: pointer to the HW structure
 * @offset: offset of the Shadow RAM word to read (0x000000 - 0x001FFF).
 * @words: (in) number of words to read; (out) number of words actually read
 * @data: words read from the Shadow RAM
 *
 * Reads 16 bit words (data buffer) from the SR using the i40e_read_nvm_srrd()
 * method. The buffer read is preceded by the NVM ownership take
 * and followed by the release.
 **/
static i40e_status i40e_read_nvm_buffer_srctl(struct i40e_hw *hw, u16 offset,
                                              u16 *words, u16 *data)
{
        i40e_status ret_code = 0;
        u16 index, word;

        /* Loop thru the selected region */
        for (word = 0; word < *words; word++) {
                index = offset + word;
                ret_code = i40e_read_nvm_word_srctl(hw, index, &data[word]);
                if (ret_code)
                        break;
        }

        /* Update the number of words read from the Shadow RAM */
        *words = word;

        return ret_code;
}

/**
 * i40e_read_nvm_buffer_aq - Reads Shadow RAM buffer via AQ
 * @hw: pointer to the HW structure
 * @offset: offset of the Shadow RAM word to read (0x000000 - 0x001FFF).
 * @words: (in) number of words to read; (out) number of words actually read
 * @data: words read from the Shadow RAM
 *
 * Reads 16 bit words (data buffer) from the SR using the i40e_read_nvm_aq()
 * method. The buffer read is preceded by the NVM ownership take
 * and followed by the release.
 **/
static i40e_status i40e_read_nvm_buffer_aq(struct i40e_hw *hw, u16 offset,
                                           u16 *words, u16 *data)
{
        i40e_status ret_code;
        u16 read_size;
        bool last_cmd = false;
        u16 words_read = 0;
        u16 i = 0;

        do {
                /* Calculate number of bytes we should read in this step.
                 * FVL AQ do not allow to read more than one page at a time or
                 * to cross page boundaries.
                 */
                if (offset % I40E_SR_SECTOR_SIZE_IN_WORDS)
                        read_size = min(*words,
                                        (u16)(I40E_SR_SECTOR_SIZE_IN_WORDS -
                                      (offset % I40E_SR_SECTOR_SIZE_IN_WORDS)));
                else
                        read_size = min((*words - words_read),
                                        I40E_SR_SECTOR_SIZE_IN_WORDS);

                /* Check if this is last command, if so set proper flag */
                if ((words_read + read_size) >= *words)
                        last_cmd = true;

                ret_code = i40e_read_nvm_aq(hw, 0x0, offset, read_size,
                                            data + words_read, last_cmd);
                if (ret_code)
                        goto read_nvm_buffer_aq_exit;

                /* Increment counter for words already read and move offset to
                 * new read location
                 */
                words_read += read_size;
                offset += read_size;
        } while (words_read < *words);

        for (i = 0; i < *words; i++)
                data[i] = le16_to_cpu(((__le16 *)data)[i]);

read_nvm_buffer_aq_exit:
        *words = words_read;
        return ret_code;
}

/**
 * __i40e_read_nvm_buffer - Reads nvm buffer, caller must acquire lock
 * @hw: pointer to the HW structure
 * @offset: offset of the Shadow RAM word to read (0x000000 - 0x001FFF).
 * @words: (in) number of words to read; (out) number of words actually read
 * @data: words read from the Shadow RAM
 *
 * Reads 16 bit words (data buffer) from the SR using the i40e_read_nvm_srrd()
 * method.
 **/
static i40e_status __i40e_read_nvm_buffer(struct i40e_hw *hw,
                                          u16 offset, u16 *words,
                                          u16 *data)
{
        if (hw->flags & I40E_HW_FLAG_AQ_SRCTL_ACCESS_ENABLE)
                return i40e_read_nvm_buffer_aq(hw, offset, words, data);

        return i40e_read_nvm_buffer_srctl(hw, offset, words, data);
}

/**
 * i40e_write_nvm_aq - Writes Shadow RAM.
 * @hw: pointer to the HW structure.
 * @module_pointer: module pointer location in words from the NVM beginning
 * @offset: offset in words from module start
 * @words: number of words to write
 * @data: buffer with words to write to the Shadow RAM
 * @last_command: tells the AdminQ that this is the last command
 *
 * Writes a 16 bit words buffer to the Shadow RAM using the admin command.
 **/
static i40e_status i40e_write_nvm_aq(struct i40e_hw *hw, u8 module_pointer,
                                     u32 offset, u16 words, void *data,
                                     bool last_command)
{
        i40e_status ret_code = I40E_ERR_NVM;
        struct i40e_asq_cmd_details cmd_details;

        memset(&cmd_details, 0, sizeof(cmd_details));
        cmd_details.wb_desc = &hw->nvm_wb_desc;

        /* Here we are checking the SR limit only for the flat memory model.
         * We cannot do it for the module-based model, as we did not acquire
         * the NVM resource yet (we cannot get the module pointer value).
         * Firmware will check the module-based model.
         */
        if ((offset + words) > hw->nvm.sr_size)
                i40e_debug(hw, I40E_DEBUG_NVM,
                           "NVM write error: offset %d beyond Shadow RAM limit %d\n",
                           (offset + words), hw->nvm.sr_size);
        else if (words > I40E_SR_SECTOR_SIZE_IN_WORDS)
                /* We can write only up to 4KB (one sector), in one AQ write */
                i40e_debug(hw, I40E_DEBUG_NVM,
                           "NVM write fail error: tried to write %d words, limit is %d.\n",
                           words, I40E_SR_SECTOR_SIZE_IN_WORDS);
        else if (((offset + (words - 1)) / I40E_SR_SECTOR_SIZE_IN_WORDS)
                 != (offset / I40E_SR_SECTOR_SIZE_IN_WORDS))
                /* A single write cannot spread over two sectors */
                i40e_debug(hw, I40E_DEBUG_NVM,
                           "NVM write error: cannot spread over two sectors in a single write offset=%d words=%d\n",
                           offset, words);
        else
                ret_code = i40e_aq_update_nvm(hw, module_pointer,
                                              2 * offset,  /*bytes*/
                                              2 * words,   /*bytes*/
                                              data, last_command, 0,
                                              &cmd_details);

        return ret_code;
}

/**
 * i40e_calc_nvm_checksum - Calculates and returns the checksum
 * @hw: pointer to hardware structure
 * @checksum: pointer to the checksum
 *
 * This function calculates SW Checksum that covers the whole 64kB shadow RAM
 * except the VPD and PCIe ALT Auto-load modules. The structure and size of VPD
 * is customer specific and unknown. Therefore, this function skips all maximum
 * possible size of VPD (1kB).
 **/
static i40e_status i40e_calc_nvm_checksum(struct i40e_hw *hw,
                                                    u16 *checksum)
{
        i40e_status ret_code;
        struct i40e_virt_mem vmem;
        u16 pcie_alt_module = 0;
        u16 checksum_local = 0;
        u16 vpd_module = 0;
        u16 *data;
        u16 i = 0;

        ret_code = i40e_allocate_virt_mem(hw, &vmem,
                                    I40E_SR_SECTOR_SIZE_IN_WORDS * sizeof(u16));
        if (ret_code)
                goto i40e_calc_nvm_checksum_exit;
        data = (u16 *)vmem.va;

        /* read pointer to VPD area */
        ret_code = __i40e_read_nvm_word(hw, I40E_SR_VPD_PTR, &vpd_module);
        if (ret_code) {
                ret_code = I40E_ERR_NVM_CHECKSUM;
                goto i40e_calc_nvm_checksum_exit;
        }

        /* read pointer to PCIe Alt Auto-load module */
        ret_code = __i40e_read_nvm_word(hw, I40E_SR_PCIE_ALT_AUTO_LOAD_PTR,
                                        &pcie_alt_module);
        if (ret_code) {
                ret_code = I40E_ERR_NVM_CHECKSUM;
                goto i40e_calc_nvm_checksum_exit;
        }

        /* Calculate SW checksum that covers the whole 64kB shadow RAM
         * except the VPD and PCIe ALT Auto-load modules
         */
        for (i = 0; i < hw->nvm.sr_size; i++) {
                /* Read SR page */
                if ((i % I40E_SR_SECTOR_SIZE_IN_WORDS) == 0) {
                        u16 words = I40E_SR_SECTOR_SIZE_IN_WORDS;

                        ret_code = __i40e_read_nvm_buffer(hw, i, &words, data);
                        if (ret_code) {
                                ret_code = I40E_ERR_NVM_CHECKSUM;
                                goto i40e_calc_nvm_checksum_exit;
                        }
                }

                /* Skip Checksum word */
                if (i == I40E_SR_SW_CHECKSUM_WORD)
                        continue;
                /* Skip VPD module (convert byte size to word count) */
                if ((i >= (u32)vpd_module) &&
                    (i < ((u32)vpd_module +
                     (I40E_SR_VPD_MODULE_MAX_SIZE / 2)))) {
                        continue;
                }
                /* Skip PCIe ALT module (convert byte size to word count) */
                if ((i >= (u32)pcie_alt_module) &&
                    (i < ((u32)pcie_alt_module +
                     (I40E_SR_PCIE_ALT_MODULE_MAX_SIZE / 2)))) {
                        continue;
                }

                checksum_local += data[i % I40E_SR_SECTOR_SIZE_IN_WORDS];
        }

        *checksum = (u16)I40E_SR_SW_CHECKSUM_BASE - checksum_local;

i40e_calc_nvm_checksum_exit:
        i40e_free_virt_mem(hw, &vmem);
        return ret_code;
}

/**
 * i40e_update_nvm_checksum - Updates the NVM checksum
 * @hw: pointer to hardware structure
 *
 * NVM ownership must be acquired before calling this function and released
 * on ARQ completion event reception by caller.
 * This function will commit SR to NVM.
 **/
i40e_status i40e_update_nvm_checksum(struct i40e_hw *hw)
{
        i40e_status ret_code;
        u16 checksum;
        __le16 le_sum;

        ret_code = i40e_calc_nvm_checksum(hw, &checksum);
        le_sum = cpu_to_le16(checksum);
        if (!ret_code)
                ret_code = i40e_write_nvm_aq(hw, 0x00, I40E_SR_SW_CHECKSUM_WORD,
                                             1, &le_sum, true);

        return ret_code;
}

/**
 * i40e_validate_nvm_checksum - Validate EEPROM checksum
 * @hw: pointer to hardware structure
 * @checksum: calculated checksum
 *
 * Performs checksum calculation and validates the NVM SW checksum. If the
 * caller does not need checksum, the value can be NULL.
 **/
i40e_status i40e_validate_nvm_checksum(struct i40e_hw *hw,
                                                 u16 *checksum)
{
        i40e_status ret_code = 0;
        u16 checksum_sr = 0;
        u16 checksum_local = 0;

        /* We must acquire the NVM lock in order to correctly synchronize the
         * NVM accesses across multiple PFs. Without doing so it is possible
         * for one of the PFs to read invalid data potentially indicating that
         * the checksum is invalid.
         */
        ret_code = i40e_acquire_nvm(hw, I40E_RESOURCE_READ);
        if (ret_code)
                return ret_code;
        ret_code = i40e_calc_nvm_checksum(hw, &checksum_local);
        __i40e_read_nvm_word(hw, I40E_SR_SW_CHECKSUM_WORD, &checksum_sr);
        i40e_release_nvm(hw);
        if (ret_code)
                return ret_code;

        /* Verify read checksum from EEPROM is the same as
         * calculated checksum
         */
        if (checksum_local != checksum_sr)
                ret_code = I40E_ERR_NVM_CHECKSUM;

        /* If the user cares, return the calculated checksum */
        if (checksum)
                *checksum = checksum_local;

        return ret_code;
}

static i40e_status i40e_nvmupd_state_init(struct i40e_hw *hw,
                                          struct i40e_nvm_access *cmd,
                                          u8 *bytes, int *perrno);
static i40e_status i40e_nvmupd_state_reading(struct i40e_hw *hw,
                                             struct i40e_nvm_access *cmd,
                                             u8 *bytes, int *perrno);
static i40e_status i40e_nvmupd_state_writing(struct i40e_hw *hw,
                                             struct i40e_nvm_access *cmd,
                                             u8 *bytes, int *errno);
static enum i40e_nvmupd_cmd i40e_nvmupd_validate_command(struct i40e_hw *hw,
                                                struct i40e_nvm_access *cmd,
                                                int *perrno);
static i40e_status i40e_nvmupd_nvm_erase(struct i40e_hw *hw,
                                         struct i40e_nvm_access *cmd,
                                         int *perrno);
static i40e_status i40e_nvmupd_nvm_write(struct i40e_hw *hw,
                                         struct i40e_nvm_access *cmd,
                                         u8 *bytes, int *perrno);
static i40e_status i40e_nvmupd_nvm_read(struct i40e_hw *hw,
                                        struct i40e_nvm_access *cmd,
                                        u8 *bytes, int *perrno);
static i40e_status i40e_nvmupd_exec_aq(struct i40e_hw *hw,
                                       struct i40e_nvm_access *cmd,
                                       u8 *bytes, int *perrno);
static i40e_status i40e_nvmupd_get_aq_result(struct i40e_hw *hw,
                                             struct i40e_nvm_access *cmd,
                                             u8 *bytes, int *perrno);
static i40e_status i40e_nvmupd_get_aq_event(struct i40e_hw *hw,
                                            struct i40e_nvm_access *cmd,
                                            u8 *bytes, int *perrno);
static inline u8 i40e_nvmupd_get_module(u32 val)
{
        return (u8)(val & I40E_NVM_MOD_PNT_MASK);
}
static inline u8 i40e_nvmupd_get_transaction(u32 val)
{
        return (u8)((val & I40E_NVM_TRANS_MASK) >> I40E_NVM_TRANS_SHIFT);
}

static inline u8 i40e_nvmupd_get_preservation_flags(u32 val)
{
        return (u8)((val & I40E_NVM_PRESERVATION_FLAGS_MASK) >>
                    I40E_NVM_PRESERVATION_FLAGS_SHIFT);
}

static const char * const i40e_nvm_update_state_str[] = {
        "I40E_NVMUPD_INVALID",
        "I40E_NVMUPD_READ_CON",
        "I40E_NVMUPD_READ_SNT",
        "I40E_NVMUPD_READ_LCB",
        "I40E_NVMUPD_READ_SA",
        "I40E_NVMUPD_WRITE_ERA",
        "I40E_NVMUPD_WRITE_CON",
        "I40E_NVMUPD_WRITE_SNT",
        "I40E_NVMUPD_WRITE_LCB",
        "I40E_NVMUPD_WRITE_SA",
        "I40E_NVMUPD_CSUM_CON",
        "I40E_NVMUPD_CSUM_SA",
        "I40E_NVMUPD_CSUM_LCB",
        "I40E_NVMUPD_STATUS",
        "I40E_NVMUPD_EXEC_AQ",
        "I40E_NVMUPD_GET_AQ_RESULT",
        "I40E_NVMUPD_GET_AQ_EVENT",
};

/**
 * i40e_nvmupd_command - Process an NVM update command
 * @hw: pointer to hardware structure
 * @cmd: pointer to nvm update command
 * @bytes: pointer to the data buffer
 * @perrno: pointer to return error code
 *
 * Dispatches command depending on what update state is current
 **/
i40e_status i40e_nvmupd_command(struct i40e_hw *hw,
                                struct i40e_nvm_access *cmd,
                                u8 *bytes, int *perrno)
{
        i40e_status status;
        enum i40e_nvmupd_cmd upd_cmd;

        /* assume success */
        *perrno = 0;

        /* early check for status command and debug msgs */
        upd_cmd = i40e_nvmupd_validate_command(hw, cmd, perrno);

        i40e_debug(hw, I40E_DEBUG_NVM, "%s state %d nvm_release_on_hold %d opc 0x%04x cmd 0x%08x config 0x%08x offset 0x%08x data_size 0x%08x\n",
                   i40e_nvm_update_state_str[upd_cmd],
                   hw->nvmupd_state,
                   hw->nvm_release_on_done, hw->nvm_wait_opcode,
                   cmd->command, cmd->config, cmd->offset, cmd->data_size);

        if (upd_cmd == I40E_NVMUPD_INVALID) {
                *perrno = -EFAULT;
                i40e_debug(hw, I40E_DEBUG_NVM,
                           "i40e_nvmupd_validate_command returns %d errno %d\n",
                           upd_cmd, *perrno);
        }

        /* a status request returns immediately rather than
         * going into the state machine
         */
        if (upd_cmd == I40E_NVMUPD_STATUS) {
                if (!cmd->data_size) {
                        *perrno = -EFAULT;
                        return I40E_ERR_BUF_TOO_SHORT;
                }

                bytes[0] = hw->nvmupd_state;

                if (cmd->data_size >= 4) {
                        bytes[1] = 0;
                        *((u16 *)&bytes[2]) = hw->nvm_wait_opcode;
                }

                /* Clear error status on read */
                if (hw->nvmupd_state == I40E_NVMUPD_STATE_ERROR)
                        hw->nvmupd_state = I40E_NVMUPD_STATE_INIT;

                return 0;
        }

        /* Clear status even it is not read and log */
        if (hw->nvmupd_state == I40E_NVMUPD_STATE_ERROR) {
                i40e_debug(hw, I40E_DEBUG_NVM,
                           "Clearing I40E_NVMUPD_STATE_ERROR state without reading\n");
                hw->nvmupd_state = I40E_NVMUPD_STATE_INIT;
        }

        /* Acquire lock to prevent race condition where adminq_task
         * can execute after i40e_nvmupd_nvm_read/write but before state
         * variables (nvm_wait_opcode, nvm_release_on_done) are updated.
         *
         * During NVMUpdate, it is observed that lock could be held for
         * ~5ms for most commands. However lock is held for ~60ms for
         * NVMUPD_CSUM_LCB command.
         */
        mutex_lock(&hw->aq.arq_mutex);
        switch (hw->nvmupd_state) {
        case I40E_NVMUPD_STATE_INIT:
                status = i40e_nvmupd_state_init(hw, cmd, bytes, perrno);
                break;

        case I40E_NVMUPD_STATE_READING:
                status = i40e_nvmupd_state_reading(hw, cmd, bytes, perrno);
                break;

        case I40E_NVMUPD_STATE_WRITING:
                status = i40e_nvmupd_state_writing(hw, cmd, bytes, perrno);
                break;

        case I40E_NVMUPD_STATE_INIT_WAIT:
        case I40E_NVMUPD_STATE_WRITE_WAIT:
                /* if we need to stop waiting for an event, clear
                 * the wait info and return before doing anything else
                 */
                if (cmd->offset == 0xffff) {
                        i40e_nvmupd_clear_wait_state(hw);
                        status = 0;
                        break;
                }

                status = I40E_ERR_NOT_READY;
                *perrno = -EBUSY;
                break;

        default:
                /* invalid state, should never happen */
                i40e_debug(hw, I40E_DEBUG_NVM,
                           "NVMUPD: no such state %d\n", hw->nvmupd_state);
                status = I40E_NOT_SUPPORTED;
                *perrno = -ESRCH;
                break;
        }

        mutex_unlock(&hw->aq.arq_mutex);
        return status;
}

/**
 * i40e_nvmupd_state_init - Handle NVM update state Init
 * @hw: pointer to hardware structure
 * @cmd: pointer to nvm update command buffer
 * @bytes: pointer to the data buffer
 * @perrno: pointer to return error code
 *
 * Process legitimate commands of the Init state and conditionally set next
 * state. Reject all other commands.
 **/
static i40e_status i40e_nvmupd_state_init(struct i40e_hw *hw,
                                          struct i40e_nvm_access *cmd,
                                          u8 *bytes, int *perrno)
{
        i40e_status status = 0;
        enum i40e_nvmupd_cmd upd_cmd;

        upd_cmd = i40e_nvmupd_validate_command(hw, cmd, perrno);

        switch (upd_cmd) {
        case I40E_NVMUPD_READ_SA:
                status = i40e_acquire_nvm(hw, I40E_RESOURCE_READ);
                if (status) {
                        *perrno = i40e_aq_rc_to_posix(status,
                                                     hw->aq.asq_last_status);
                } else {
                        status = i40e_nvmupd_nvm_read(hw, cmd, bytes, perrno);
                        i40e_release_nvm(hw);
                }
                break;

        case I40E_NVMUPD_READ_SNT:
                status = i40e_acquire_nvm(hw, I40E_RESOURCE_READ);
                if (status) {
                        *perrno = i40e_aq_rc_to_posix(status,
                                                     hw->aq.asq_last_status);
                } else {
                        status = i40e_nvmupd_nvm_read(hw, cmd, bytes, perrno);
                        if (status)
                                i40e_release_nvm(hw);
                        else
                                hw->nvmupd_state = I40E_NVMUPD_STATE_READING;
                }
                break;

        case I40E_NVMUPD_WRITE_ERA:
                status = i40e_acquire_nvm(hw, I40E_RESOURCE_WRITE);
                if (status) {
                        *perrno = i40e_aq_rc_to_posix(status,
                                                     hw->aq.asq_last_status);
                } else {
                        status = i40e_nvmupd_nvm_erase(hw, cmd, perrno);
                        if (status) {
                                i40e_release_nvm(hw);
                        } else {
                                hw->nvm_release_on_done = true;
                                hw->nvm_wait_opcode = i40e_aqc_opc_nvm_erase;
                                hw->nvmupd_state = I40E_NVMUPD_STATE_INIT_WAIT;
                        }
                }
                break;

        case I40E_NVMUPD_WRITE_SA:
                status = i40e_acquire_nvm(hw, I40E_RESOURCE_WRITE);
                if (status) {
                        *perrno = i40e_aq_rc_to_posix(status,
                                                     hw->aq.asq_last_status);
                } else {
                        status = i40e_nvmupd_nvm_write(hw, cmd, bytes, perrno);
                        if (status) {
                                i40e_release_nvm(hw);
                        } else {
                                hw->nvm_release_on_done = true;
                                hw->nvm_wait_opcode = i40e_aqc_opc_nvm_update;
                                hw->nvmupd_state = I40E_NVMUPD_STATE_INIT_WAIT;
                        }
                }
                break;

        case I40E_NVMUPD_WRITE_SNT:
                status = i40e_acquire_nvm(hw, I40E_RESOURCE_WRITE);
                if (status) {
                        *perrno = i40e_aq_rc_to_posix(status,
                                                     hw->aq.asq_last_status);
                } else {
                        status = i40e_nvmupd_nvm_write(hw, cmd, bytes, perrno);
                        if (status) {
                                i40e_release_nvm(hw);
                        } else {
                                hw->nvm_wait_opcode = i40e_aqc_opc_nvm_update;
                                hw->nvmupd_state = I40E_NVMUPD_STATE_WRITE_WAIT;
                        }
                }
                break;

        case I40E_NVMUPD_CSUM_SA:
                status = i40e_acquire_nvm(hw, I40E_RESOURCE_WRITE);
                if (status) {
                        *perrno = i40e_aq_rc_to_posix(status,
                                                     hw->aq.asq_last_status);
                } else {
                        status = i40e_update_nvm_checksum(hw);
                        if (status) {
                                *perrno = hw->aq.asq_last_status ?
                                   i40e_aq_rc_to_posix(status,
                                                       hw->aq.asq_last_status) :
                                   -EIO;
                                i40e_release_nvm(hw);
                        } else {
                                hw->nvm_release_on_done = true;
                                hw->nvm_wait_opcode = i40e_aqc_opc_nvm_update;
                                hw->nvmupd_state = I40E_NVMUPD_STATE_INIT_WAIT;
                        }
                }
                break;

        case I40E_NVMUPD_EXEC_AQ:
                status = i40e_nvmupd_exec_aq(hw, cmd, bytes, perrno);
                break;

        case I40E_NVMUPD_GET_AQ_RESULT:
                status = i40e_nvmupd_get_aq_result(hw, cmd, bytes, perrno);
                break;

        case I40E_NVMUPD_GET_AQ_EVENT:
                status = i40e_nvmupd_get_aq_event(hw, cmd, bytes, perrno);
                break;

        default:
                i40e_debug(hw, I40E_DEBUG_NVM,
                           "NVMUPD: bad cmd %s in init state\n",
                           i40e_nvm_update_state_str[upd_cmd]);
                status = I40E_ERR_NVM;
                *perrno = -ESRCH;
                break;
        }
        return status;
}

/**
 * i40e_nvmupd_state_reading - Handle NVM update state Reading
 * @hw: pointer to hardware structure
 * @cmd: pointer to nvm update command buffer
 * @bytes: pointer to the data buffer
 * @perrno: pointer to return error code
 *
 * NVM ownership is already held.  Process legitimate commands and set any
 * change in state; reject all other commands.
 **/
static i40e_status i40e_nvmupd_state_reading(struct i40e_hw *hw,
                                             struct i40e_nvm_access *cmd,
                                             u8 *bytes, int *perrno)
{
        i40e_status status = 0;
        enum i40e_nvmupd_cmd upd_cmd;

        upd_cmd = i40e_nvmupd_validate_command(hw, cmd, perrno);

        switch (upd_cmd) {
        case I40E_NVMUPD_READ_SA:
        case I40E_NVMUPD_READ_CON:
                status = i40e_nvmupd_nvm_read(hw, cmd, bytes, perrno);
                break;

        case I40E_NVMUPD_READ_LCB:
                status = i40e_nvmupd_nvm_read(hw, cmd, bytes, perrno);
                i40e_release_nvm(hw);
                hw->nvmupd_state = I40E_NVMUPD_STATE_INIT;
                break;

        default:
                i40e_debug(hw, I40E_DEBUG_NVM,
                           "NVMUPD: bad cmd %s in reading state.\n",
                           i40e_nvm_update_state_str[upd_cmd]);
                status = I40E_NOT_SUPPORTED;
                *perrno = -ESRCH;
                break;
        }
        return status;
}

/**
 * i40e_nvmupd_state_writing - Handle NVM update state Writing
 * @hw: pointer to hardware structure
 * @cmd: pointer to nvm update command buffer
 * @bytes: pointer to the data buffer
 * @perrno: pointer to return error code
 *
 * NVM ownership is already held.  Process legitimate commands and set any
 * change in state; reject all other commands

 **/
static i40e_status i40e_nvmupd_state_writing(struct i40e_hw *hw,
                                             struct i40e_nvm_access *cmd,
                                             u8 *bytes, int *perrno)
{
        i40e_status status = 0;
        enum i40e_nvmupd_cmd upd_cmd;
        bool retry_attempt = false;

        upd_cmd = i40e_nvmupd_validate_command(hw, cmd, perrno);

retry:
        switch (upd_cmd) {
        case I40E_NVMUPD_WRITE_CON:
                status = i40e_nvmupd_nvm_write(hw, cmd, bytes, perrno);
                if (!status) {
                        hw->nvm_wait_opcode = i40e_aqc_opc_nvm_update;
                        hw->nvmupd_state = I40E_NVMUPD_STATE_WRITE_WAIT;
                }
                break;

        case I40E_NVMUPD_WRITE_LCB:
                status = i40e_nvmupd_nvm_write(hw, cmd, bytes, perrno);
                if (status) {
                        *perrno = hw->aq.asq_last_status ?
                                   i40e_aq_rc_to_posix(status,
                                                       hw->aq.asq_last_status) :
                                   -EIO;
                        hw->nvmupd_state = I40E_NVMUPD_STATE_INIT;
                } else {
                        hw->nvm_release_on_done = true;
                        hw->nvm_wait_opcode = i40e_aqc_opc_nvm_update;
                        hw->nvmupd_state = I40E_NVMUPD_STATE_INIT_WAIT;
                }
                break;

        case I40E_NVMUPD_CSUM_CON:
                /* Assumes the caller has acquired the nvm */
                status = i40e_update_nvm_checksum(hw);
                if (status) {
                        *perrno = hw->aq.asq_last_status ?
                                   i40e_aq_rc_to_posix(status,
                                                       hw->aq.asq_last_status) :
                                   -EIO;
                        hw->nvmupd_state = I40E_NVMUPD_STATE_INIT;
                } else {
                        hw->nvm_wait_opcode = i40e_aqc_opc_nvm_update;
                        hw->nvmupd_state = I40E_NVMUPD_STATE_WRITE_WAIT;
                }
                break;

        case I40E_NVMUPD_CSUM_LCB:
                /* Assumes the caller has acquired the nvm */
                status = i40e_update_nvm_checksum(hw);
                if (status) {
                        *perrno = hw->aq.asq_last_status ?
                                   i40e_aq_rc_to_posix(status,
                                                       hw->aq.asq_last_status) :
                                   -EIO;
                        hw->nvmupd_state = I40E_NVMUPD_STATE_INIT;
                } else {
                        hw->nvm_release_on_done = true;
                        hw->nvm_wait_opcode = i40e_aqc_opc_nvm_update;
                        hw->nvmupd_state = I40E_NVMUPD_STATE_INIT_WAIT;
                }
                break;

        default:
                i40e_debug(hw, I40E_DEBUG_NVM,
                           "NVMUPD: bad cmd %s in writing state.\n",
                           i40e_nvm_update_state_str[upd_cmd]);
                status = I40E_NOT_SUPPORTED;
                *perrno = -ESRCH;
                break;
        }

        /* In some circumstances, a multi-write transaction takes longer
         * than the default 3 minute timeout on the write semaphore.  If
         * the write failed with an EBUSY status, this is likely the problem,
         * so here we try to reacquire the semaphore then retry the write.
         * We only do one retry, then give up.
         */
        if (status && (hw->aq.asq_last_status == I40E_AQ_RC_EBUSY) &&
            !retry_attempt) {
                i40e_status old_status = status;
                u32 old_asq_status = hw->aq.asq_last_status;
                u32 gtime;

                gtime = rd32(hw, I40E_GLVFGEN_TIMER);
                if (gtime >= hw->nvm.hw_semaphore_timeout) {
                        i40e_debug(hw, I40E_DEBUG_ALL,
                                   "NVMUPD: write semaphore expired (%d >= %lld), retrying\n",
                                   gtime, hw->nvm.hw_semaphore_timeout);
                        i40e_release_nvm(hw);
                        status = i40e_acquire_nvm(hw, I40E_RESOURCE_WRITE);
                        if (status) {
                                i40e_debug(hw, I40E_DEBUG_ALL,
                                           "NVMUPD: write semaphore reacquire failed aq_err = %d\n",
                                           hw->aq.asq_last_status);
                                status = old_status;
                                hw->aq.asq_last_status = old_asq_status;
                        } else {
                                retry_attempt = true;
                                goto retry;
                        }
                }
        }

        return status;
}

/**
 * i40e_nvmupd_clear_wait_state - clear wait state on hw
 * @hw: pointer to the hardware structure
 **/
void i40e_nvmupd_clear_wait_state(struct i40e_hw *hw)
{
        i40e_debug(hw, I40E_DEBUG_NVM,
                   "NVMUPD: clearing wait on opcode 0x%04x\n",
                   hw->nvm_wait_opcode);

        if (hw->nvm_release_on_done) {
                i40e_release_nvm(hw);
                hw->nvm_release_on_done = false;
        }
        hw->nvm_wait_opcode = 0;

        if (hw->aq.arq_last_status) {
                hw->nvmupd_state = I40E_NVMUPD_STATE_ERROR;
                return;
        }

        switch (hw->nvmupd_state) {
        case I40E_NVMUPD_STATE_INIT_WAIT:
                hw->nvmupd_state = I40E_NVMUPD_STATE_INIT;
                break;

        case I40E_NVMUPD_STATE_WRITE_WAIT:
                hw->nvmupd_state = I40E_NVMUPD_STATE_WRITING;
                break;

        default:
                break;
        }
}

/**
 * i40e_nvmupd_check_wait_event - handle NVM update operation events
 * @hw: pointer to the hardware structure
 * @opcode: the event that just happened
 * @desc: AdminQ descriptor
 **/
void i40e_nvmupd_check_wait_event(struct i40e_hw *hw, u16 opcode,
                                  struct i40e_aq_desc *desc)
{
        u32 aq_desc_len = sizeof(struct i40e_aq_desc);

        if (opcode == hw->nvm_wait_opcode) {
                memcpy(&hw->nvm_aq_event_desc, desc, aq_desc_len);
                i40e_nvmupd_clear_wait_state(hw);
        }
}

/**
 * i40e_nvmupd_validate_command - Validate given command
 * @hw: pointer to hardware structure
 * @cmd: pointer to nvm update command buffer
 * @perrno: pointer to return error code
 *
 * Return one of the valid command types or I40E_NVMUPD_INVALID
 **/
static enum i40e_nvmupd_cmd i40e_nvmupd_validate_command(struct i40e_hw *hw,
                                                 struct i40e_nvm_access *cmd,
                                                 int *perrno)
{
        enum i40e_nvmupd_cmd upd_cmd;
        u8 module, transaction;

        /* anything that doesn't match a recognized case is an error */
        upd_cmd = I40E_NVMUPD_INVALID;

        transaction = i40e_nvmupd_get_transaction(cmd->config);
        module = i40e_nvmupd_get_module(cmd->config);

        /* limits on data size */
        if ((cmd->data_size < 1) ||
            (cmd->data_size > I40E_NVMUPD_MAX_DATA)) {
                i40e_debug(hw, I40E_DEBUG_NVM,
                           "i40e_nvmupd_validate_command data_size %d\n",
                           cmd->data_size);
                *perrno = -EFAULT;
                return I40E_NVMUPD_INVALID;
        }

        switch (cmd->command) {
        case I40E_NVM_READ:
                switch (transaction) {
                case I40E_NVM_CON:
                        upd_cmd = I40E_NVMUPD_READ_CON;
                        break;
                case I40E_NVM_SNT:
                        upd_cmd = I40E_NVMUPD_READ_SNT;
                        break;
                case I40E_NVM_LCB:
                        upd_cmd = I40E_NVMUPD_READ_LCB;
                        break;
                case I40E_NVM_SA:
                        upd_cmd = I40E_NVMUPD_READ_SA;
                        break;
                case I40E_NVM_EXEC:
                        if (module == 0xf)
                                upd_cmd = I40E_NVMUPD_STATUS;
                        else if (module == 0)
                                upd_cmd = I40E_NVMUPD_GET_AQ_RESULT;
                        break;
                case I40E_NVM_AQE:
                        upd_cmd = I40E_NVMUPD_GET_AQ_EVENT;
                        break;
                }
                break;

        case I40E_NVM_WRITE:
                switch (transaction) {
                case I40E_NVM_CON:
                        upd_cmd = I40E_NVMUPD_WRITE_CON;
                        break;
                case I40E_NVM_SNT:
                        upd_cmd = I40E_NVMUPD_WRITE_SNT;
                        break;
                case I40E_NVM_LCB:
                        upd_cmd = I40E_NVMUPD_WRITE_LCB;
                        break;
                case I40E_NVM_SA:
                        upd_cmd = I40E_NVMUPD_WRITE_SA;
                        break;
                case I40E_NVM_ERA:
                        upd_cmd = I40E_NVMUPD_WRITE_ERA;
                        break;
                case I40E_NVM_CSUM:
                        upd_cmd = I40E_NVMUPD_CSUM_CON;
                        break;
                case (I40E_NVM_CSUM|I40E_NVM_SA):
                        upd_cmd = I40E_NVMUPD_CSUM_SA;
                        break;
                case (I40E_NVM_CSUM|I40E_NVM_LCB):
                        upd_cmd = I40E_NVMUPD_CSUM_LCB;
                        break;
                case I40E_NVM_EXEC:
                        if (module == 0)
                                upd_cmd = I40E_NVMUPD_EXEC_AQ;
                        break;
                }
                break;
        }

        return upd_cmd;
}

/**
 * i40e_nvmupd_exec_aq - Run an AQ command
 * @hw: pointer to hardware structure
 * @cmd: pointer to nvm update command buffer
 * @bytes: pointer to the data buffer
 * @perrno: pointer to return error code
 *
 * cmd structure contains identifiers and data buffer
 **/
static i40e_status i40e_nvmupd_exec_aq(struct i40e_hw *hw,
                                       struct i40e_nvm_access *cmd,
                                       u8 *bytes, int *perrno)
{
        struct i40e_asq_cmd_details cmd_details;
        i40e_status status;
        struct i40e_aq_desc *aq_desc;
        u32 buff_size = 0;
        u8 *buff = NULL;
        u32 aq_desc_len;
        u32 aq_data_len;

        i40e_debug(hw, I40E_DEBUG_NVM, "NVMUPD: %s\n", __func__);
        if (cmd->offset == 0xffff)
                return 0;

        memset(&cmd_details, 0, sizeof(cmd_details));
        cmd_details.wb_desc = &hw->nvm_wb_desc;

        aq_desc_len = sizeof(struct i40e_aq_desc);
        memset(&hw->nvm_wb_desc, 0, aq_desc_len);

        /* get the aq descriptor */
        if (cmd->data_size < aq_desc_len) {
                i40e_debug(hw, I40E_DEBUG_NVM,
                           "NVMUPD: not enough aq desc bytes for exec, size %d < %d\n",
                           cmd->data_size, aq_desc_len);
                *perrno = -EINVAL;
                return I40E_ERR_PARAM;
        }
        aq_desc = (struct i40e_aq_desc *)bytes;

        /* if data buffer needed, make sure it's ready */
        aq_data_len = cmd->data_size - aq_desc_len;
        buff_size = max_t(u32, aq_data_len, le16_to_cpu(aq_desc->datalen));
        if (buff_size) {
                if (!hw->nvm_buff.va) {
                        status = i40e_allocate_virt_mem(hw, &hw->nvm_buff,
                                                        hw->aq.asq_buf_size);
                        if (status)
                                i40e_debug(hw, I40E_DEBUG_NVM,
                                           "NVMUPD: i40e_allocate_virt_mem for exec buff failed, %d\n",
                                           status);
                }

                if (hw->nvm_buff.va) {
                        buff = hw->nvm_buff.va;
                        memcpy(buff, &bytes[aq_desc_len], aq_data_len);
                }
        }

        if (cmd->offset)
                memset(&hw->nvm_aq_event_desc, 0, aq_desc_len);

        /* and away we go! */
        status = i40e_asq_send_command(hw, aq_desc, buff,
                                       buff_size, &cmd_details);
        if (status) {
                i40e_debug(hw, I40E_DEBUG_NVM,
                           "i40e_nvmupd_exec_aq err %s aq_err %s\n",
                           i40e_stat_str(hw, status),
                           i40e_aq_str(hw, hw->aq.asq_last_status));
                *perrno = i40e_aq_rc_to_posix(status, hw->aq.asq_last_status);
                return status;
        }

        /* should we wait for a followup event? */
        if (cmd->offset) {
                hw->nvm_wait_opcode = cmd->offset;
                hw->nvmupd_state = I40E_NVMUPD_STATE_INIT_WAIT;
        }

        return status;
}

/**
 * i40e_nvmupd_get_aq_result - Get the results from the previous exec_aq
 * @hw: pointer to hardware structure
 * @cmd: pointer to nvm update command buffer
 * @bytes: pointer to the data buffer
 * @perrno: pointer to return error code
 *
 * cmd structure contains identifiers and data buffer
 **/
static i40e_status i40e_nvmupd_get_aq_result(struct i40e_hw *hw,
                                             struct i40e_nvm_access *cmd,
                                             u8 *bytes, int *perrno)
{
        u32 aq_total_len;
        u32 aq_desc_len;
        int remainder;
        u8 *buff;

        i40e_debug(hw, I40E_DEBUG_NVM, "NVMUPD: %s\n", __func__);

        aq_desc_len = sizeof(struct i40e_aq_desc);
        aq_total_len = aq_desc_len + le16_to_cpu(hw->nvm_wb_desc.datalen);

        /* check offset range */
        if (cmd->offset > aq_total_len) {
                i40e_debug(hw, I40E_DEBUG_NVM, "%s: offset too big %d > %d\n",
                           __func__, cmd->offset, aq_total_len);
                *perrno = -EINVAL;
                return I40E_ERR_PARAM;
        }

        /* check copylength range */
        if (cmd->data_size > (aq_total_len - cmd->offset)) {
                int new_len = aq_total_len - cmd->offset;

                i40e_debug(hw, I40E_DEBUG_NVM, "%s: copy length %d too big, trimming to %d\n",
                           __func__, cmd->data_size, new_len);
                cmd->data_size = new_len;
        }

        remainder = cmd->data_size;
        if (cmd->offset < aq_desc_len) {
                u32 len = aq_desc_len - cmd->offset;

                len = min(len, cmd->data_size);
                i40e_debug(hw, I40E_DEBUG_NVM, "%s: aq_desc bytes %d to %d\n",
                           __func__, cmd->offset, cmd->offset + len);

                buff = ((u8 *)&hw->nvm_wb_desc) + cmd->offset;
                memcpy(bytes, buff, len);

                bytes += len;
                remainder -= len;
                buff = hw->nvm_buff.va;
        } else {
                buff = hw->nvm_buff.va + (cmd->offset - aq_desc_len);
        }

        if (remainder > 0) {
                int start_byte = buff - (u8 *)hw->nvm_buff.va;

                i40e_debug(hw, I40E_DEBUG_NVM, "%s: databuf bytes %d to %d\n",
                           __func__, start_byte, start_byte + remainder);
                memcpy(bytes, buff, remainder);
        }

        return 0;
}

/**
 * i40e_nvmupd_get_aq_event - Get the Admin Queue event from previous exec_aq
 * @hw: pointer to hardware structure
 * @cmd: pointer to nvm update command buffer
 * @bytes: pointer to the data buffer
 * @perrno: pointer to return error code
 *
 * cmd structure contains identifiers and data buffer
 **/
static i40e_status i40e_nvmupd_get_aq_event(struct i40e_hw *hw,
                                            struct i40e_nvm_access *cmd,
                                            u8 *bytes, int *perrno)
{
        u32 aq_total_len;
        u32 aq_desc_len;

        i40e_debug(hw, I40E_DEBUG_NVM, "NVMUPD: %s\n", __func__);

        aq_desc_len = sizeof(struct i40e_aq_desc);
        aq_total_len = aq_desc_len + le16_to_cpu(hw->nvm_aq_event_desc.datalen);

        /* check copylength range */
        if (cmd->data_size > aq_total_len) {
                i40e_debug(hw, I40E_DEBUG_NVM,
                           "%s: copy length %d too big, trimming to %d\n",
                           __func__, cmd->data_size, aq_total_len);
                cmd->data_size = aq_total_len;
        }

        memcpy(bytes, &hw->nvm_aq_event_desc, cmd->data_size);

        return 0;
}

/**
 * i40e_nvmupd_nvm_read - Read NVM
 * @hw: pointer to hardware structure
 * @cmd: pointer to nvm update command buffer
 * @bytes: pointer to the data buffer
 * @perrno: pointer to return error code
 *
 * cmd structure contains identifiers and data buffer
 **/
static i40e_status i40e_nvmupd_nvm_read(struct i40e_hw *hw,
                                        struct i40e_nvm_access *cmd,
                                        u8 *bytes, int *perrno)
{
        struct i40e_asq_cmd_details cmd_details;
        i40e_status status;
        u8 module, transaction;
        bool last;

        transaction = i40e_nvmupd_get_transaction(cmd->config);
        module = i40e_nvmupd_get_module(cmd->config);
        last = (transaction == I40E_NVM_LCB) || (transaction == I40E_NVM_SA);

        memset(&cmd_details, 0, sizeof(cmd_details));
        cmd_details.wb_desc = &hw->nvm_wb_desc;

        status = i40e_aq_read_nvm(hw, module, cmd->offset, (u16)cmd->data_size,
                                  bytes, last, &cmd_details);
        if (status) {
                i40e_debug(hw, I40E_DEBUG_NVM,
                           "i40e_nvmupd_nvm_read mod 0x%x  off 0x%x  len 0x%x\n",
                           module, cmd->offset, cmd->data_size);
                i40e_debug(hw, I40E_DEBUG_NVM,
                           "i40e_nvmupd_nvm_read status %d aq %d\n",
                           status, hw->aq.asq_last_status);
                *perrno = i40e_aq_rc_to_posix(status, hw->aq.asq_last_status);
        }

        return status;
}

/**
 * i40e_nvmupd_nvm_erase - Erase an NVM module
 * @hw: pointer to hardware structure
 * @cmd: pointer to nvm update command buffer
 * @perrno: pointer to return error code
 *
 * module, offset, data_size and data are in cmd structure
 **/
static i40e_status i40e_nvmupd_nvm_erase(struct i40e_hw *hw,
                                         struct i40e_nvm_access *cmd,
                                         int *perrno)
{
        i40e_status status = 0;
        struct i40e_asq_cmd_details cmd_details;
        u8 module, transaction;
        bool last;

        transaction = i40e_nvmupd_get_transaction(cmd->config);
        module = i40e_nvmupd_get_module(cmd->config);
        last = (transaction & I40E_NVM_LCB);

        memset(&cmd_details, 0, sizeof(cmd_details));
        cmd_details.wb_desc = &hw->nvm_wb_desc;

        status = i40e_aq_erase_nvm(hw, module, cmd->offset, (u16)cmd->data_size,
                                   last, &cmd_details);
        if (status) {
                i40e_debug(hw, I40E_DEBUG_NVM,
                           "i40e_nvmupd_nvm_erase mod 0x%x  off 0x%x len 0x%x\n",
                           module, cmd->offset, cmd->data_size);
                i40e_debug(hw, I40E_DEBUG_NVM,
                           "i40e_nvmupd_nvm_erase status %d aq %d\n",
                           status, hw->aq.asq_last_status);
                *perrno = i40e_aq_rc_to_posix(status, hw->aq.asq_last_status);
        }

        return status;
}

/**
 * i40e_nvmupd_nvm_write - Write NVM
 * @hw: pointer to hardware structure
 * @cmd: pointer to nvm update command buffer
 * @bytes: pointer to the data buffer
 * @perrno: pointer to return error code
 *
 * module, offset, data_size and data are in cmd structure
 **/
static i40e_status i40e_nvmupd_nvm_write(struct i40e_hw *hw,
                                         struct i40e_nvm_access *cmd,
                                         u8 *bytes, int *perrno)
{
        i40e_status status = 0;
        struct i40e_asq_cmd_details cmd_details;
        u8 module, transaction;
        u8 preservation_flags;
        bool last;

        transaction = i40e_nvmupd_get_transaction(cmd->config);
        module = i40e_nvmupd_get_module(cmd->config);
        last = (transaction & I40E_NVM_LCB);
        preservation_flags = i40e_nvmupd_get_preservation_flags(cmd->config);

        memset(&cmd_details, 0, sizeof(cmd_details));
        cmd_details.wb_desc = &hw->nvm_wb_desc;

        status = i40e_aq_update_nvm(hw, module, cmd->offset,
                                    (u16)cmd->data_size, bytes, last,
                                    preservation_flags, &cmd_details);
        if (status) {
                i40e_debug(hw, I40E_DEBUG_NVM,
                           "i40e_nvmupd_nvm_write mod 0x%x off 0x%x len 0x%x\n",
                           module, cmd->offset, cmd->data_size);
                i40e_debug(hw, I40E_DEBUG_NVM,
                           "i40e_nvmupd_nvm_write status %d aq %d\n",
                           status, hw->aq.asq_last_status);
                *perrno = i40e_aq_rc_to_posix(status, hw->aq.asq_last_status);
        }

        return status;
}