text: /*******************************************************************************
   *
   * Intel Ethernet Controller XL710 Family Linux Virtual Function Driver
   * Copyright(c) 2013 - 2016 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_status.h"
  #include "i40e_type.h"
  #include "i40e_register.h"
  #include "i40e_adminq.h"
  #include "i40e_prototype.h"
  
  /**
   * i40e_is_nvm_update_op - return true if this is an NVM update operation
   * @desc: API request descriptor
   **/
  static inline bool i40e_is_nvm_update_op(struct i40e_aq_desc *desc)
  {
  	return (desc->opcode == i40e_aqc_opc_nvm_erase) ||
  	       (desc->opcode == i40e_aqc_opc_nvm_update);
  }
  
  /**
   *  i40e_adminq_init_regs - Initialize AdminQ registers
   *  @hw: pointer to the hardware structure
   *
   *  This assumes the alloc_asq and alloc_arq functions have already been called
   **/
  static void i40e_adminq_init_regs(struct i40e_hw *hw)
  {
  	/* set head and tail registers in our local struct */
  	if (i40e_is_vf(hw)) {
  		hw->aq.asq.tail = I40E_VF_ATQT1;
  		hw->aq.asq.head = I40E_VF_ATQH1;
  		hw->aq.asq.len  = I40E_VF_ATQLEN1;
  		hw->aq.asq.bal  = I40E_VF_ATQBAL1;
  		hw->aq.asq.bah  = I40E_VF_ATQBAH1;
  		hw->aq.arq.tail = I40E_VF_ARQT1;
  		hw->aq.arq.head = I40E_VF_ARQH1;
  		hw->aq.arq.len  = I40E_VF_ARQLEN1;
  		hw->aq.arq.bal  = I40E_VF_ARQBAL1;
  		hw->aq.arq.bah  = I40E_VF_ARQBAH1;
  	}
  }
  
  /**
   *  i40e_alloc_adminq_asq_ring - Allocate Admin Queue send rings
   *  @hw: pointer to the hardware structure
   **/
  static i40e_status i40e_alloc_adminq_asq_ring(struct i40e_hw *hw)
  {
  	i40e_status ret_code;
  
  	ret_code = i40e_allocate_dma_mem(hw, &hw->aq.asq.desc_buf,
  					 i40e_mem_atq_ring,
  					 (hw->aq.num_asq_entries *
  					 sizeof(struct i40e_aq_desc)),
  					 I40E_ADMINQ_DESC_ALIGNMENT);
  	if (ret_code)
  		return ret_code;
  
  	ret_code = i40e_allocate_virt_mem(hw, &hw->aq.asq.cmd_buf,
  					  (hw->aq.num_asq_entries *
  					  sizeof(struct i40e_asq_cmd_details)));
  	if (ret_code) {
  		i40e_free_dma_mem(hw, &hw->aq.asq.desc_buf);
  		return ret_code;
  	}
  
  	return ret_code;
  }
  
  /**
   *  i40e_alloc_adminq_arq_ring - Allocate Admin Queue receive rings
   *  @hw: pointer to the hardware structure
   **/
  static i40e_status i40e_alloc_adminq_arq_ring(struct i40e_hw *hw)
  {
  	i40e_status ret_code;
  
  	ret_code = i40e_allocate_dma_mem(hw, &hw->aq.arq.desc_buf,
  					 i40e_mem_arq_ring,
  					 (hw->aq.num_arq_entries *
  					 sizeof(struct i40e_aq_desc)),
  					 I40E_ADMINQ_DESC_ALIGNMENT);
  
  	return ret_code;
  }
  
  /**
   *  i40e_free_adminq_asq - Free Admin Queue send rings
   *  @hw: pointer to the hardware structure
   *
   *  This assumes the posted send buffers have already been cleaned
   *  and de-allocated
   **/
  static void i40e_free_adminq_asq(struct i40e_hw *hw)
  {
  	i40e_free_dma_mem(hw, &hw->aq.asq.desc_buf);
  }
  
  /**
   *  i40e_free_adminq_arq - Free Admin Queue receive rings
   *  @hw: pointer to the hardware structure
   *
   *  This assumes the posted receive buffers have already been cleaned
   *  and de-allocated
   **/
  static void i40e_free_adminq_arq(struct i40e_hw *hw)
  {
  	i40e_free_dma_mem(hw, &hw->aq.arq.desc_buf);
  }
  
  /**
   *  i40e_alloc_arq_bufs - Allocate pre-posted buffers for the receive queue
   *  @hw: pointer to the hardware structure
   **/
  static i40e_status i40e_alloc_arq_bufs(struct i40e_hw *hw)
  {
  	i40e_status ret_code;
  	struct i40e_aq_desc *desc;
  	struct i40e_dma_mem *bi;
  	int i;
  
  	/* We'll be allocating the buffer info memory first, then we can
  	 * allocate the mapped buffers for the event processing
  	 */
  
  	/* buffer_info structures do not need alignment */
  	ret_code = i40e_allocate_virt_mem(hw, &hw->aq.arq.dma_head,
  		(hw->aq.num_arq_entries * sizeof(struct i40e_dma_mem)));
  	if (ret_code)
  		goto alloc_arq_bufs;
  	hw->aq.arq.r.arq_bi = (struct i40e_dma_mem *)hw->aq.arq.dma_head.va;
  
  	/* allocate the mapped buffers */
  	for (i = 0; i < hw->aq.num_arq_entries; i++) {
  		bi = &hw->aq.arq.r.arq_bi[i];
  		ret_code = i40e_allocate_dma_mem(hw, bi,
  						 i40e_mem_arq_buf,
  						 hw->aq.arq_buf_size,
  						 I40E_ADMINQ_DESC_ALIGNMENT);
  		if (ret_code)
  			goto unwind_alloc_arq_bufs;
  
  		/* now configure the descriptors for use */
  		desc = I40E_ADMINQ_DESC(hw->aq.arq, i);
  
  		desc->flags = cpu_to_le16(I40E_AQ_FLAG_BUF);
  		if (hw->aq.arq_buf_size > I40E_AQ_LARGE_BUF)
  			desc->flags |= cpu_to_le16(I40E_AQ_FLAG_LB);
  		desc->opcode = 0;
  		/* This is in accordance with Admin queue design, there is no
  		 * register for buffer size configuration
  		 */
  		desc->datalen = cpu_to_le16((u16)bi->size);
  		desc->retval = 0;
  		desc->cookie_high = 0;
  		desc->cookie_low = 0;
  		desc->params.external.addr_high =
  			cpu_to_le32(upper_32_bits(bi->pa));
  		desc->params.external.addr_low =
  			cpu_to_le32(lower_32_bits(bi->pa));
  		desc->params.external.param0 = 0;
  		desc->params.external.param1 = 0;
  	}
  
  alloc_arq_bufs:
  	return ret_code;
  
  unwind_alloc_arq_bufs:
  	/* don't try to free the one that failed... */
  	i--;
  	for (; i >= 0; i--)
  		i40e_free_dma_mem(hw, &hw->aq.arq.r.arq_bi[i]);
  	i40e_free_virt_mem(hw, &hw->aq.arq.dma_head);
  
  	return ret_code;
  }
  
  /**
   *  i40e_alloc_asq_bufs - Allocate empty buffer structs for the send queue
   *  @hw: pointer to the hardware structure
   **/
  static i40e_status i40e_alloc_asq_bufs(struct i40e_hw *hw)
  {
  	i40e_status ret_code;
  	struct i40e_dma_mem *bi;
  	int i;
  
  	/* No mapped memory needed yet, just the buffer info structures */
  	ret_code = i40e_allocate_virt_mem(hw, &hw->aq.asq.dma_head,
  		(hw->aq.num_asq_entries * sizeof(struct i40e_dma_mem)));
  	if (ret_code)
  		goto alloc_asq_bufs;
  	hw->aq.asq.r.asq_bi = (struct i40e_dma_mem *)hw->aq.asq.dma_head.va;
  
  	/* allocate the mapped buffers */
  	for (i = 0; i < hw->aq.num_asq_entries; i++) {
  		bi = &hw->aq.asq.r.asq_bi[i];
  		ret_code = i40e_allocate_dma_mem(hw, bi,
  						 i40e_mem_asq_buf,
  						 hw->aq.asq_buf_size,
  						 I40E_ADMINQ_DESC_ALIGNMENT);
  		if (ret_code)
  			goto unwind_alloc_asq_bufs;
  	}
  alloc_asq_bufs:
  	return ret_code;
  
  unwind_alloc_asq_bufs:
  	/* don't try to free the one that failed... */
  	i--;
  	for (; i >= 0; i--)
  		i40e_free_dma_mem(hw, &hw->aq.asq.r.asq_bi[i]);
  	i40e_free_virt_mem(hw, &hw->aq.asq.dma_head);
  
  	return ret_code;
  }
  
  /**
   *  i40e_free_arq_bufs - Free receive queue buffer info elements
   *  @hw: pointer to the hardware structure
   **/
  static void i40e_free_arq_bufs(struct i40e_hw *hw)
  {
  	int i;
  
  	/* free descriptors */
  	for (i = 0; i < hw->aq.num_arq_entries; i++)
  		i40e_free_dma_mem(hw, &hw->aq.arq.r.arq_bi[i]);
  
  	/* free the descriptor memory */
  	i40e_free_dma_mem(hw, &hw->aq.arq.desc_buf);
  
  	/* free the dma header */
  	i40e_free_virt_mem(hw, &hw->aq.arq.dma_head);
  }
  
  /**
   *  i40e_free_asq_bufs - Free send queue buffer info elements
   *  @hw: pointer to the hardware structure
   **/
  static void i40e_free_asq_bufs(struct i40e_hw *hw)
  {
  	int i;
  
  	/* only unmap if the address is non-NULL */
  	for (i = 0; i < hw->aq.num_asq_entries; i++)
  		if (hw->aq.asq.r.asq_bi[i].pa)
  			i40e_free_dma_mem(hw, &hw->aq.asq.r.asq_bi[i]);
  
  	/* free the buffer info list */
  	i40e_free_virt_mem(hw, &hw->aq.asq.cmd_buf);
  
  	/* free the descriptor memory */
  	i40e_free_dma_mem(hw, &hw->aq.asq.desc_buf);
  
  	/* free the dma header */
  	i40e_free_virt_mem(hw, &hw->aq.asq.dma_head);
  }
  
  /**
   *  i40e_config_asq_regs - configure ASQ registers
   *  @hw: pointer to the hardware structure
   *
   *  Configure base address and length registers for the transmit queue
   **/
  static i40e_status i40e_config_asq_regs(struct i40e_hw *hw)
  {
  	i40e_status ret_code = 0;
  	u32 reg = 0;
  
  	/* Clear Head and Tail */
  	wr32(hw, hw->aq.asq.head, 0);
  	wr32(hw, hw->aq.asq.tail, 0);
  
  	/* set starting point */
  	wr32(hw, hw->aq.asq.len, (hw->aq.num_asq_entries |
  				  I40E_VF_ATQLEN1_ATQENABLE_MASK));
  	wr32(hw, hw->aq.asq.bal, lower_32_bits(hw->aq.asq.desc_buf.pa));
  	wr32(hw, hw->aq.asq.bah, upper_32_bits(hw->aq.asq.desc_buf.pa));
  
  	/* Check one register to verify that config was applied */
  	reg = rd32(hw, hw->aq.asq.bal);
  	if (reg != lower_32_bits(hw->aq.asq.desc_buf.pa))
  		ret_code = I40E_ERR_ADMIN_QUEUE_ERROR;
  
  	return ret_code;
  }
  
  /**
   *  i40e_config_arq_regs - ARQ register configuration
   *  @hw: pointer to the hardware structure
   *
   * Configure base address and length registers for the receive (event queue)
   **/
  static i40e_status i40e_config_arq_regs(struct i40e_hw *hw)
  {
  	i40e_status ret_code = 0;
  	u32 reg = 0;
  
  	/* Clear Head and Tail */
  	wr32(hw, hw->aq.arq.head, 0);
  	wr32(hw, hw->aq.arq.tail, 0);
  
  	/* set starting point */
  	wr32(hw, hw->aq.arq.len, (hw->aq.num_arq_entries |
  				  I40E_VF_ARQLEN1_ARQENABLE_MASK));
  	wr32(hw, hw->aq.arq.bal, lower_32_bits(hw->aq.arq.desc_buf.pa));
  	wr32(hw, hw->aq.arq.bah, upper_32_bits(hw->aq.arq.desc_buf.pa));
  
  	/* Update tail in the HW to post pre-allocated buffers */
  	wr32(hw, hw->aq.arq.tail, hw->aq.num_arq_entries - 1);
  
  	/* Check one register to verify that config was applied */
  	reg = rd32(hw, hw->aq.arq.bal);
  	if (reg != lower_32_bits(hw->aq.arq.desc_buf.pa))
  		ret_code = I40E_ERR_ADMIN_QUEUE_ERROR;
  
  	return ret_code;
  }
  
  /**
   *  i40e_init_asq - main initialization routine for ASQ
   *  @hw: pointer to the hardware structure
   *
   *  This is the main initialization routine for the Admin Send Queue
   *  Prior to calling this function, drivers *MUST* set the following fields
   *  in the hw->aq structure:
   *     - hw->aq.num_asq_entries
   *     - hw->aq.arq_buf_size
   *
   *  Do *NOT* hold the lock when calling this as the memory allocation routines
   *  called are not going to be atomic context safe
   **/
  static i40e_status i40e_init_asq(struct i40e_hw *hw)
  {
  	i40e_status ret_code = 0;
  
  	if (hw->aq.asq.count > 0) {
  		/* queue already initialized */
  		ret_code = I40E_ERR_NOT_READY;
  		goto init_adminq_exit;
  	}
  
  	/* verify input for valid configuration */
  	if ((hw->aq.num_asq_entries == 0) ||
  	    (hw->aq.asq_buf_size == 0)) {
  		ret_code = I40E_ERR_CONFIG;
  		goto init_adminq_exit;
  	}
  
  	hw->aq.asq.next_to_use = 0;
  	hw->aq.asq.next_to_clean = 0;
  
  	/* allocate the ring memory */
  	ret_code = i40e_alloc_adminq_asq_ring(hw);
  	if (ret_code)
  		goto init_adminq_exit;
  
  	/* allocate buffers in the rings */
  	ret_code = i40e_alloc_asq_bufs(hw);
  	if (ret_code)
  		goto init_adminq_free_rings;
  
  	/* initialize base registers */
  	ret_code = i40e_config_asq_regs(hw);
  	if (ret_code)
  		goto init_adminq_free_rings;
  
  	/* success! */
  	hw->aq.asq.count = hw->aq.num_asq_entries;
  	goto init_adminq_exit;
  
  init_adminq_free_rings:
  	i40e_free_adminq_asq(hw);
  
  init_adminq_exit:
  	return ret_code;
  }
  
  /**
   *  i40e_init_arq - initialize ARQ
   *  @hw: pointer to the hardware structure
   *
   *  The main initialization routine for the Admin Receive (Event) Queue.
   *  Prior to calling this function, drivers *MUST* set the following fields
   *  in the hw->aq structure:
   *     - hw->aq.num_asq_entries
   *     - hw->aq.arq_buf_size
   *
   *  Do *NOT* hold the lock when calling this as the memory allocation routines
   *  called are not going to be atomic context safe
   **/
  static i40e_status i40e_init_arq(struct i40e_hw *hw)
  {
  	i40e_status ret_code = 0;
  
  	if (hw->aq.arq.count > 0) {
  		/* queue already initialized */
  		ret_code = I40E_ERR_NOT_READY;
  		goto init_adminq_exit;
  	}
  
  	/* verify input for valid configuration */
  	if ((hw->aq.num_arq_entries == 0) ||
  	    (hw->aq.arq_buf_size == 0)) {
  		ret_code = I40E_ERR_CONFIG;
  		goto init_adminq_exit;
  	}
  
  	hw->aq.arq.next_to_use = 0;
  	hw->aq.arq.next_to_clean = 0;
  
  	/* allocate the ring memory */
  	ret_code = i40e_alloc_adminq_arq_ring(hw);
  	if (ret_code)
  		goto init_adminq_exit;
  
  	/* allocate buffers in the rings */
  	ret_code = i40e_alloc_arq_bufs(hw);
  	if (ret_code)
  		goto init_adminq_free_rings;
  
  	/* initialize base registers */
  	ret_code = i40e_config_arq_regs(hw);
  	if (ret_code)
  		goto init_adminq_free_rings;
  
  	/* success! */
  	hw->aq.arq.count = hw->aq.num_arq_entries;
  	goto init_adminq_exit;
  
  init_adminq_free_rings:
  	i40e_free_adminq_arq(hw);
  
  init_adminq_exit:
  	return ret_code;
  }
  
  /**
   *  i40e_shutdown_asq - shutdown the ASQ
   *  @hw: pointer to the hardware structure
   *
   *  The main shutdown routine for the Admin Send Queue
   **/
  static i40e_status i40e_shutdown_asq(struct i40e_hw *hw)
  {
  	i40e_status ret_code = 0;
  
  	mutex_lock(&hw->aq.asq_mutex);
  
  	if (hw->aq.asq.count == 0) {
  		ret_code = I40E_ERR_NOT_READY;
  		goto shutdown_asq_out;
  	}
  
  	/* Stop firmware AdminQ processing */
  	wr32(hw, hw->aq.asq.head, 0);
  	wr32(hw, hw->aq.asq.tail, 0);
  	wr32(hw, hw->aq.asq.len, 0);
  	wr32(hw, hw->aq.asq.bal, 0);
  	wr32(hw, hw->aq.asq.bah, 0);
  
  	hw->aq.asq.count = 0; /* to indicate uninitialized queue */
  
  	/* free ring buffers */
  	i40e_free_asq_bufs(hw);
  
  shutdown_asq_out:
  	mutex_unlock(&hw->aq.asq_mutex);
  	return ret_code;
  }
  
  /**
   *  i40e_shutdown_arq - shutdown ARQ
   *  @hw: pointer to the hardware structure
   *
   *  The main shutdown routine for the Admin Receive Queue
   **/
  static i40e_status i40e_shutdown_arq(struct i40e_hw *hw)
  {
  	i40e_status ret_code = 0;
  
  	mutex_lock(&hw->aq.arq_mutex);
  
  	if (hw->aq.arq.count == 0) {
  		ret_code = I40E_ERR_NOT_READY;
  		goto shutdown_arq_out;
  	}
  
  	/* Stop firmware AdminQ processing */
  	wr32(hw, hw->aq.arq.head, 0);
  	wr32(hw, hw->aq.arq.tail, 0);
  	wr32(hw, hw->aq.arq.len, 0);
  	wr32(hw, hw->aq.arq.bal, 0);
  	wr32(hw, hw->aq.arq.bah, 0);
  
  	hw->aq.arq.count = 0; /* to indicate uninitialized queue */
  
  	/* free ring buffers */
  	i40e_free_arq_bufs(hw);
  
  shutdown_arq_out:
  	mutex_unlock(&hw->aq.arq_mutex);
  	return ret_code;
  }
  
  /**
   *  i40evf_init_adminq - main initialization routine for Admin Queue
   *  @hw: pointer to the hardware structure
   *
   *  Prior to calling this function, drivers *MUST* set the following fields
   *  in the hw->aq structure:
   *     - hw->aq.num_asq_entries
   *     - hw->aq.num_arq_entries
   *     - hw->aq.arq_buf_size
   *     - hw->aq.asq_buf_size
   **/
  i40e_status i40evf_init_adminq(struct i40e_hw *hw)
  {
  	i40e_status ret_code;
  
  	/* verify input for valid configuration */
  	if ((hw->aq.num_arq_entries == 0) ||
  	    (hw->aq.num_asq_entries == 0) ||
  	    (hw->aq.arq_buf_size == 0) ||
  	    (hw->aq.asq_buf_size == 0)) {
  		ret_code = I40E_ERR_CONFIG;
  		goto init_adminq_exit;
  	}
  
  	/* Set up register offsets */
  	i40e_adminq_init_regs(hw);
  
  	/* setup ASQ command write back timeout */
  	hw->aq.asq_cmd_timeout = I40E_ASQ_CMD_TIMEOUT;
  
  	/* allocate the ASQ */
  	ret_code = i40e_init_asq(hw);
  	if (ret_code)
  		goto init_adminq_destroy_locks;
  
  	/* allocate the ARQ */
  	ret_code = i40e_init_arq(hw);
  	if (ret_code)
  		goto init_adminq_free_asq;
  
  	/* success! */
  	goto init_adminq_exit;
  
  init_adminq_free_asq:
  	i40e_shutdown_asq(hw);
  init_adminq_destroy_locks:
  
  init_adminq_exit:
  	return ret_code;
  }
  
  /**
   *  i40evf_shutdown_adminq - shutdown routine for the Admin Queue
   *  @hw: pointer to the hardware structure
   **/
  i40e_status i40evf_shutdown_adminq(struct i40e_hw *hw)
  {
  	i40e_status ret_code = 0;
  
  	if (i40evf_check_asq_alive(hw))
  		i40evf_aq_queue_shutdown(hw, true);
  
  	i40e_shutdown_asq(hw);
  	i40e_shutdown_arq(hw);
  
  	if (hw->nvm_buff.va)
  		i40e_free_virt_mem(hw, &hw->nvm_buff);
  
  	return ret_code;
  }
  
  /**
   *  i40e_clean_asq - cleans Admin send queue
   *  @hw: pointer to the hardware structure
   *
   *  returns the number of free desc
   **/
  static u16 i40e_clean_asq(struct i40e_hw *hw)
  {
  	struct i40e_adminq_ring *asq = &(hw->aq.asq);
  	struct i40e_asq_cmd_details *details;
  	u16 ntc = asq->next_to_clean;
  	struct i40e_aq_desc desc_cb;
  	struct i40e_aq_desc *desc;
  
  	desc = I40E_ADMINQ_DESC(*asq, ntc);
  	details = I40E_ADMINQ_DETAILS(*asq, ntc);
  	while (rd32(hw, hw->aq.asq.head) != ntc) {
  		i40e_debug(hw, I40E_DEBUG_AQ_MESSAGE,
  			   "ntc %d head %d.\n", ntc, rd32(hw, hw->aq.asq.head));
  
  		if (details->callback) {
  			I40E_ADMINQ_CALLBACK cb_func =
  					(I40E_ADMINQ_CALLBACK)details->callback;
  			desc_cb = *desc;
  			cb_func(hw, &desc_cb);
  		}
  		memset((void *)desc, 0, sizeof(struct i40e_aq_desc));
  		memset((void *)details, 0,
  		       sizeof(struct i40e_asq_cmd_details));
  		ntc++;
  		if (ntc == asq->count)
  			ntc = 0;
  		desc = I40E_ADMINQ_DESC(*asq, ntc);
  		details = I40E_ADMINQ_DETAILS(*asq, ntc);
  	}
  
  	asq->next_to_clean = ntc;
  
  	return I40E_DESC_UNUSED(asq);
  }
  
  /**
   *  i40evf_asq_done - check if FW has processed the Admin Send Queue
   *  @hw: pointer to the hw struct
   *
   *  Returns true if the firmware has processed all descriptors on the
   *  admin send queue. Returns false if there are still requests pending.
   **/
  bool i40evf_asq_done(struct i40e_hw *hw)
  {
  	/* AQ designers suggest use of head for better
  	 * timing reliability than DD bit
  	 */
  	return rd32(hw, hw->aq.asq.head) == hw->aq.asq.next_to_use;
  
  }
  
  /**
   *  i40evf_asq_send_command - send command to Admin Queue
   *  @hw: pointer to the hw struct
   *  @desc: prefilled descriptor describing the command (non DMA mem)
   *  @buff: buffer to use for indirect commands
   *  @buff_size: size of buffer for indirect commands
   *  @cmd_details: pointer to command details structure
   *
   *  This is the main send command driver routine for the Admin Queue send
   *  queue.  It runs the queue, cleans the queue, etc
   **/
  i40e_status i40evf_asq_send_command(struct i40e_hw *hw,
  				struct i40e_aq_desc *desc,
  				void *buff, /* can be NULL */
  				u16  buff_size,
  				struct i40e_asq_cmd_details *cmd_details)
  {
  	i40e_status status = 0;
  	struct i40e_dma_mem *dma_buff = NULL;
  	struct i40e_asq_cmd_details *details;
  	struct i40e_aq_desc *desc_on_ring;
  	bool cmd_completed = false;
  	u16  retval = 0;
  	u32  val = 0;
  
  	mutex_lock(&hw->aq.asq_mutex);
  
  	if (hw->aq.asq.count == 0) {
  		i40e_debug(hw, I40E_DEBUG_AQ_MESSAGE,
  			   "AQTX: Admin queue not initialized.\n");
  		status = I40E_ERR_QUEUE_EMPTY;
  		goto asq_send_command_error;
  	}
  
  	hw->aq.asq_last_status = I40E_AQ_RC_OK;
  
  	val = rd32(hw, hw->aq.asq.head);
  	if (val >= hw->aq.num_asq_entries) {
  		i40e_debug(hw, I40E_DEBUG_AQ_MESSAGE,
  			   "AQTX: head overrun at %d\n", val);
  		status = I40E_ERR_QUEUE_EMPTY;
  		goto asq_send_command_error;
  	}
  
  	details = I40E_ADMINQ_DETAILS(hw->aq.asq, hw->aq.asq.next_to_use);
  	if (cmd_details) {
  		*details = *cmd_details;
  
  		/* If the cmd_details are defined copy the cookie.  The
  		 * cpu_to_le32 is not needed here because the data is ignored
  		 * by the FW, only used by the driver
  		 */
  		if (details->cookie) {
  			desc->cookie_high =
  				cpu_to_le32(upper_32_bits(details->cookie));
  			desc->cookie_low =
  				cpu_to_le32(lower_32_bits(details->cookie));
  		}
  	} else {
  		memset(details, 0, sizeof(struct i40e_asq_cmd_details));
  	}
  
  	/* clear requested flags and then set additional flags if defined */
  	desc->flags &= ~cpu_to_le16(details->flags_dis);
  	desc->flags |= cpu_to_le16(details->flags_ena);
  
  	if (buff_size > hw->aq.asq_buf_size) {
  		i40e_debug(hw,
  			   I40E_DEBUG_AQ_MESSAGE,
  			   "AQTX: Invalid buffer size: %d.\n",
  			   buff_size);
  		status = I40E_ERR_INVALID_SIZE;
  		goto asq_send_command_error;
  	}
  
  	if (details->postpone && !details->async) {
  		i40e_debug(hw,
  			   I40E_DEBUG_AQ_MESSAGE,
  			   "AQTX: Async flag not set along with postpone flag");
  		status = I40E_ERR_PARAM;
  		goto asq_send_command_error;
  	}
  
  	/* call clean and check queue available function to reclaim the
  	 * descriptors that were processed by FW, the function returns the
  	 * number of desc available
  	 */
  	/* the clean function called here could be called in a separate thread
  	 * in case of asynchronous completions
  	 */
  	if (i40e_clean_asq(hw) == 0) {
  		i40e_debug(hw,
  			   I40E_DEBUG_AQ_MESSAGE,
  			   "AQTX: Error queue is full.\n");
  		status = I40E_ERR_ADMIN_QUEUE_FULL;
  		goto asq_send_command_error;
  	}
  
  	/* initialize the temp desc pointer with the right desc */
  	desc_on_ring = I40E_ADMINQ_DESC(hw->aq.asq, hw->aq.asq.next_to_use);
  
  	/* if the desc is available copy the temp desc to the right place */
  	*desc_on_ring = *desc;
  
  	/* if buff is not NULL assume indirect command */
  	if (buff != NULL) {
  		dma_buff = &(hw->aq.asq.r.asq_bi[hw->aq.asq.next_to_use]);
  		/* copy the user buff into the respective DMA buff */
  		memcpy(dma_buff->va, buff, buff_size);
  		desc_on_ring->datalen = cpu_to_le16(buff_size);
  
  		/* Update the address values in the desc with the pa value
  		 * for respective buffer
  		 */
  		desc_on_ring->params.external.addr_high =
  				cpu_to_le32(upper_32_bits(dma_buff->pa));
  		desc_on_ring->params.external.addr_low =
  				cpu_to_le32(lower_32_bits(dma_buff->pa));
  	}
  
  	/* bump the tail */
  	i40e_debug(hw, I40E_DEBUG_AQ_MESSAGE, "AQTX: desc and buffer:\n");
  	i40evf_debug_aq(hw, I40E_DEBUG_AQ_COMMAND, (void *)desc_on_ring,
  			buff, buff_size);
  	(hw->aq.asq.next_to_use)++;
  	if (hw->aq.asq.next_to_use == hw->aq.asq.count)
  		hw->aq.asq.next_to_use = 0;
  	if (!details->postpone)
  		wr32(hw, hw->aq.asq.tail, hw->aq.asq.next_to_use);
  
  	/* if cmd_details are not defined or async flag is not set,
  	 * we need to wait for desc write back
  	 */
  	if (!details->async && !details->postpone) {
  		u32 total_delay = 0;
  
  		do {
  			/* AQ designers suggest use of head for better
  			 * timing reliability than DD bit
  			 */
  			if (i40evf_asq_done(hw))
  				break;
  			usleep_range(1000, 2000);
  			total_delay++;
  		} while (total_delay < hw->aq.asq_cmd_timeout);
  	}
  
  	/* if ready, copy the desc back to temp */
  	if (i40evf_asq_done(hw)) {
  		*desc = *desc_on_ring;
  		if (buff != NULL)
  			memcpy(buff, dma_buff->va, buff_size);
  		retval = le16_to_cpu(desc->retval);
  		if (retval != 0) {
  			i40e_debug(hw,
  				   I40E_DEBUG_AQ_MESSAGE,
  				   "AQTX: Command completed with error 0x%X.\n",
  				   retval);
  
  			/* strip off FW internal code */
  			retval &= 0xff;
  		}
  		cmd_completed = true;
  		if ((enum i40e_admin_queue_err)retval == I40E_AQ_RC_OK)
  			status = 0;
  		else
  			status = I40E_ERR_ADMIN_QUEUE_ERROR;
  		hw->aq.asq_last_status = (enum i40e_admin_queue_err)retval;
  	}
  
  	i40e_debug(hw, I40E_DEBUG_AQ_MESSAGE,
  		   "AQTX: desc and buffer writeback:\n");
  	i40evf_debug_aq(hw, I40E_DEBUG_AQ_COMMAND, (void *)desc, buff,
  			buff_size);
  
  	/* save writeback aq if requested */
  	if (details->wb_desc)
  		*details->wb_desc = *desc_on_ring;
  
  	/* update the error if time out occurred */
  	if ((!cmd_completed) &&
  	    (!details->async && !details->postpone)) {
  		i40e_debug(hw,
  			   I40E_DEBUG_AQ_MESSAGE,
  			   "AQTX: Writeback timeout.\n");
  		status = I40E_ERR_ADMIN_QUEUE_TIMEOUT;
  	}
  
  asq_send_command_error:
  	mutex_unlock(&hw->aq.asq_mutex);
  	return status;
  }
  
  /**
   *  i40evf_fill_default_direct_cmd_desc - AQ descriptor helper function
   *  @desc:     pointer to the temp descriptor (non DMA mem)
   *  @opcode:   the opcode can be used to decide which flags to turn off or on
   *
   *  Fill the desc with default values
   **/
  void i40evf_fill_default_direct_cmd_desc(struct i40e_aq_desc *desc,
  				       u16 opcode)
  {
  	/* zero out the desc */
  	memset((void *)desc, 0, sizeof(struct i40e_aq_desc));
  	desc->opcode = cpu_to_le16(opcode);
  	desc->flags = cpu_to_le16(I40E_AQ_FLAG_SI);
  }
  
  /**
   *  i40evf_clean_arq_element
   *  @hw: pointer to the hw struct
   *  @e: event info from the receive descriptor, includes any buffers
   *  @pending: number of events that could be left to process
   *
   *  This function cleans one Admin Receive Queue element and returns
   *  the contents through e.  It can also return how many events are
   *  left to process through 'pending'
   **/
  i40e_status i40evf_clean_arq_element(struct i40e_hw *hw,
  					     struct i40e_arq_event_info *e,
  					     u16 *pending)
  {
  	i40e_status ret_code = 0;
  	u16 ntc = hw->aq.arq.next_to_clean;
  	struct i40e_aq_desc *desc;
  	struct i40e_dma_mem *bi;
  	u16 desc_idx;
  	u16 datalen;
  	u16 flags;
  	u16 ntu;
  
  	/* pre-clean the event info */
  	memset(&e->desc, 0, sizeof(e->desc));
  
  	/* take the lock before we start messing with the ring */
  	mutex_lock(&hw->aq.arq_mutex);
  
  	if (hw->aq.arq.count == 0) {
  		i40e_debug(hw, I40E_DEBUG_AQ_MESSAGE,
  			   "AQRX: Admin queue not initialized.\n");
  		ret_code = I40E_ERR_QUEUE_EMPTY;
  		goto clean_arq_element_err;
  	}
  
  	/* set next_to_use to head */
  	ntu = (rd32(hw, hw->aq.arq.head) & I40E_VF_ARQH1_ARQH_MASK);
  	if (ntu == ntc) {
  		/* nothing to do - shouldn't need to update ring's values */
  		ret_code = I40E_ERR_ADMIN_QUEUE_NO_WORK;
  		goto clean_arq_element_out;
  	}
  
  	/* now clean the next descriptor */
  	desc = I40E_ADMINQ_DESC(hw->aq.arq, ntc);
  	desc_idx = ntc;
  
  	flags = le16_to_cpu(desc->flags);
  	if (flags & I40E_AQ_FLAG_ERR) {
  		ret_code = I40E_ERR_ADMIN_QUEUE_ERROR;
  		hw->aq.arq_last_status =
  			(enum i40e_admin_queue_err)le16_to_cpu(desc->retval);
  		i40e_debug(hw,
  			   I40E_DEBUG_AQ_MESSAGE,
  			   "AQRX: Event received with error 0x%X.\n",
  			   hw->aq.arq_last_status);
  	}
  
  	e->desc = *desc;
  	datalen = le16_to_cpu(desc->datalen);
  	e->msg_len = min(datalen, e->buf_len);
  	if (e->msg_buf != NULL && (e->msg_len != 0))
  		memcpy(e->msg_buf, hw->aq.arq.r.arq_bi[desc_idx].va,
  		       e->msg_len);
  
  	i40e_debug(hw, I40E_DEBUG_AQ_MESSAGE, "AQRX: desc and buffer:\n");
  	i40evf_debug_aq(hw, I40E_DEBUG_AQ_COMMAND, (void *)desc, e->msg_buf,
  			hw->aq.arq_buf_size);
  
  	/* Restore the original datalen and buffer address in the desc,
  	 * FW updates datalen to indicate the event message
  	 * size
  	 */
  	bi = &hw->aq.arq.r.arq_bi[ntc];
  	memset((void *)desc, 0, sizeof(struct i40e_aq_desc));
  
  	desc->flags = cpu_to_le16(I40E_AQ_FLAG_BUF);
  	if (hw->aq.arq_buf_size > I40E_AQ_LARGE_BUF)
  		desc->flags |= cpu_to_le16(I40E_AQ_FLAG_LB);
  	desc->datalen = cpu_to_le16((u16)bi->size);
  	desc->params.external.addr_high = cpu_to_le32(upper_32_bits(bi->pa));
  	desc->params.external.addr_low = cpu_to_le32(lower_32_bits(bi->pa));
  
  	/* set tail = the last cleaned desc index. */
  	wr32(hw, hw->aq.arq.tail, ntc);
  	/* ntc is updated to tail + 1 */
  	ntc++;
  	if (ntc == hw->aq.num_arq_entries)
  		ntc = 0;
  	hw->aq.arq.next_to_clean = ntc;
  	hw->aq.arq.next_to_use = ntu;
  
  clean_arq_element_out:
  	/* Set pending if needed, unlock and return */
  	if (pending != NULL)
  		*pending = (ntc > ntu ? hw->aq.arq.count : 0) + (ntu - ntc);
  
  clean_arq_element_err:
  	mutex_unlock(&hw->aq.arq_mutex);
  
  	return ret_code;
  }
  
  void i40evf_resume_aq(struct i40e_hw *hw)
  {
  	/* Registers are reset after PF reset */
  	hw->aq.asq.next_to_use = 0;
  	hw->aq.asq.next_to_clean = 0;
  
  	i40e_config_asq_regs(hw);
  
  	hw->aq.arq.next_to_use = 0;
  	hw->aq.arq.next_to_clean = 0;
  
  	i40e_config_arq_regs(hw);
  }
  