FreeBSD/Linux Kernel Cross Reference
sys/dev/ixgbe/ixgbe_mbx.c

     /******************************************************************************
       SPDX-License-Identifier: BSD-3-Clause
     
       Copyright (c) 2001-2020, Intel Corporation
       All rights reserved.
     
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      THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
      AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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    ******************************************************************************/
    /*$FreeBSD$*/
    
    #include "ixgbe_type.h"
    #include "ixgbe_mbx.h"
    
    /**
     * ixgbe_read_mbx - Reads a message from the mailbox
     * @hw: pointer to the HW structure
     * @msg: The message buffer
     * @size: Length of buffer
     * @mbx_id: id of mailbox to read
     *
     * returns SUCCESS if it successfully read message from buffer
     **/
    s32 ixgbe_read_mbx(struct ixgbe_hw *hw, u32 *msg, u16 size, u16 mbx_id)
    {
            struct ixgbe_mbx_info *mbx = &hw->mbx;
            s32 ret_val = IXGBE_ERR_MBX;
    
            DEBUGFUNC("ixgbe_read_mbx");
    
            /* limit read to size of mailbox */
            if (size > mbx->size)
                    size = mbx->size;
    
            if (mbx->ops.read)
                    ret_val = mbx->ops.read(hw, msg, size, mbx_id);
    
            return ret_val;
    }
    
    /**
     * ixgbe_write_mbx - Write a message to the mailbox
     * @hw: pointer to the HW structure
     * @msg: The message buffer
     * @size: Length of buffer
     * @mbx_id: id of mailbox to write
     *
     * returns SUCCESS if it successfully copied message into the buffer
     **/
    s32 ixgbe_write_mbx(struct ixgbe_hw *hw, u32 *msg, u16 size, u16 mbx_id)
    {
            struct ixgbe_mbx_info *mbx = &hw->mbx;
            s32 ret_val = IXGBE_SUCCESS;
    
            DEBUGFUNC("ixgbe_write_mbx");
    
            if (size > mbx->size) {
                    ret_val = IXGBE_ERR_MBX;
                    ERROR_REPORT2(IXGBE_ERROR_ARGUMENT,
                                 "Invalid mailbox message size %d", size);
            } else if (mbx->ops.write)
                    ret_val = mbx->ops.write(hw, msg, size, mbx_id);
    
            return ret_val;
    }
    
    /**
     * ixgbe_check_for_msg - checks to see if someone sent us mail
     * @hw: pointer to the HW structure
     * @mbx_id: id of mailbox to check
     *
     * returns SUCCESS if the Status bit was found or else ERR_MBX
     **/
    s32 ixgbe_check_for_msg(struct ixgbe_hw *hw, u16 mbx_id)
    {
           struct ixgbe_mbx_info *mbx = &hw->mbx;
           s32 ret_val = IXGBE_ERR_MBX;
   
           DEBUGFUNC("ixgbe_check_for_msg");
   
           if (mbx->ops.check_for_msg)
                   ret_val = mbx->ops.check_for_msg(hw, mbx_id);
   
           return ret_val;
   }
   
   /**
    * ixgbe_check_for_ack - checks to see if someone sent us ACK
    * @hw: pointer to the HW structure
    * @mbx_id: id of mailbox to check
    *
    * returns SUCCESS if the Status bit was found or else ERR_MBX
    **/
   s32 ixgbe_check_for_ack(struct ixgbe_hw *hw, u16 mbx_id)
   {
           struct ixgbe_mbx_info *mbx = &hw->mbx;
           s32 ret_val = IXGBE_ERR_MBX;
   
           DEBUGFUNC("ixgbe_check_for_ack");
   
           if (mbx->ops.check_for_ack)
                   ret_val = mbx->ops.check_for_ack(hw, mbx_id);
   
           return ret_val;
   }
   
   /**
    * ixgbe_check_for_rst - checks to see if other side has reset
    * @hw: pointer to the HW structure
    * @mbx_id: id of mailbox to check
    *
    * returns SUCCESS if the Status bit was found or else ERR_MBX
    **/
   s32 ixgbe_check_for_rst(struct ixgbe_hw *hw, u16 mbx_id)
   {
           struct ixgbe_mbx_info *mbx = &hw->mbx;
           s32 ret_val = IXGBE_ERR_MBX;
   
           DEBUGFUNC("ixgbe_check_for_rst");
   
           if (mbx->ops.check_for_rst)
                   ret_val = mbx->ops.check_for_rst(hw, mbx_id);
   
           return ret_val;
   }
   
   /**
    * ixgbe_poll_for_msg - Wait for message notification
    * @hw: pointer to the HW structure
    * @mbx_id: id of mailbox to write
    *
    * returns SUCCESS if it successfully received a message notification
    **/
   static s32 ixgbe_poll_for_msg(struct ixgbe_hw *hw, u16 mbx_id)
   {
           struct ixgbe_mbx_info *mbx = &hw->mbx;
           int countdown = mbx->timeout;
   
           DEBUGFUNC("ixgbe_poll_for_msg");
   
           if (!countdown || !mbx->ops.check_for_msg)
                   goto out;
   
           while (countdown && mbx->ops.check_for_msg(hw, mbx_id)) {
                   countdown--;
                   if (!countdown)
                           break;
                   usec_delay(mbx->usec_delay);
           }
   
           if (countdown == 0)
                   ERROR_REPORT2(IXGBE_ERROR_POLLING,
                              "Polling for VF%d mailbox message timedout", mbx_id);
   
   out:
           return countdown ? IXGBE_SUCCESS : IXGBE_ERR_MBX;
   }
   
   /**
    * ixgbe_poll_for_ack - Wait for message acknowledgment
    * @hw: pointer to the HW structure
    * @mbx_id: id of mailbox to write
    *
    * returns SUCCESS if it successfully received a message acknowledgment
    **/
   static s32 ixgbe_poll_for_ack(struct ixgbe_hw *hw, u16 mbx_id)
   {
           struct ixgbe_mbx_info *mbx = &hw->mbx;
           int countdown = mbx->timeout;
   
           DEBUGFUNC("ixgbe_poll_for_ack");
   
           if (!countdown || !mbx->ops.check_for_ack)
                   goto out;
   
           while (countdown && mbx->ops.check_for_ack(hw, mbx_id)) {
                   countdown--;
                   if (!countdown)
                           break;
                   usec_delay(mbx->usec_delay);
           }
   
           if (countdown == 0)
                   ERROR_REPORT2(IXGBE_ERROR_POLLING,
                                "Polling for VF%d mailbox ack timedout", mbx_id);
   
   out:
           return countdown ? IXGBE_SUCCESS : IXGBE_ERR_MBX;
   }
   
   /**
    * ixgbe_read_posted_mbx - Wait for message notification and receive message
    * @hw: pointer to the HW structure
    * @msg: The message buffer
    * @size: Length of buffer
    * @mbx_id: id of mailbox to write
    *
    * returns SUCCESS if it successfully received a message notification and
    * copied it into the receive buffer.
    **/
   s32 ixgbe_read_posted_mbx(struct ixgbe_hw *hw, u32 *msg, u16 size,
                                    u16 mbx_id)
   {
           struct ixgbe_mbx_info *mbx = &hw->mbx;
           s32 ret_val = IXGBE_ERR_MBX;
   
           DEBUGFUNC("ixgbe_read_posted_mbx");
   
           if (!mbx->ops.read)
                   goto out;
   
           ret_val = ixgbe_poll_for_msg(hw, mbx_id);
   
           /* if ack received read message, otherwise we timed out */
           if (!ret_val)
                   ret_val = mbx->ops.read(hw, msg, size, mbx_id);
   out:
           return ret_val;
   }
   
   /**
    * ixgbe_write_posted_mbx - Write a message to the mailbox, wait for ack
    * @hw: pointer to the HW structure
    * @msg: The message buffer
    * @size: Length of buffer
    * @mbx_id: id of mailbox to write
    *
    * returns SUCCESS if it successfully copied message into the buffer and
    * received an ack to that message within delay * timeout period
    **/
   s32 ixgbe_write_posted_mbx(struct ixgbe_hw *hw, u32 *msg, u16 size,
                                     u16 mbx_id)
   {
           struct ixgbe_mbx_info *mbx = &hw->mbx;
           s32 ret_val = IXGBE_ERR_MBX;
   
           DEBUGFUNC("ixgbe_write_posted_mbx");
   
           /* exit if either we can't write or there isn't a defined timeout */
           if (!mbx->ops.write || !mbx->timeout)
                   goto out;
   
           /* send msg */
           ret_val = mbx->ops.write(hw, msg, size, mbx_id);
   
           /* if msg sent wait until we receive an ack */
           if (!ret_val)
                   ret_val = ixgbe_poll_for_ack(hw, mbx_id);
   out:
           return ret_val;
   }
   
   /**
    * ixgbe_init_mbx_ops_generic - Initialize MB function pointers
    * @hw: pointer to the HW structure
    *
    * Setups up the mailbox read and write message function pointers
    **/
   void ixgbe_init_mbx_ops_generic(struct ixgbe_hw *hw)
   {
           struct ixgbe_mbx_info *mbx = &hw->mbx;
   
           mbx->ops.read_posted = ixgbe_read_posted_mbx;
           mbx->ops.write_posted = ixgbe_write_posted_mbx;
   }
   
   /**
    * ixgbe_read_v2p_mailbox - read v2p mailbox
    * @hw: pointer to the HW structure
    *
    * This function is used to read the v2p mailbox without losing the read to
    * clear status bits.
    **/
   static u32 ixgbe_read_v2p_mailbox(struct ixgbe_hw *hw)
   {
           u32 v2p_mailbox = IXGBE_READ_REG(hw, IXGBE_VFMAILBOX);
   
           v2p_mailbox |= hw->mbx.v2p_mailbox;
           hw->mbx.v2p_mailbox |= v2p_mailbox & IXGBE_VFMAILBOX_R2C_BITS;
   
           return v2p_mailbox;
   }
   
   /**
    * ixgbe_check_for_bit_vf - Determine if a status bit was set
    * @hw: pointer to the HW structure
    * @mask: bitmask for bits to be tested and cleared
    *
    * This function is used to check for the read to clear bits within
    * the V2P mailbox.
    **/
   static s32 ixgbe_check_for_bit_vf(struct ixgbe_hw *hw, u32 mask)
   {
           u32 v2p_mailbox = ixgbe_read_v2p_mailbox(hw);
           s32 ret_val = IXGBE_ERR_MBX;
   
           if (v2p_mailbox & mask)
                   ret_val = IXGBE_SUCCESS;
   
           hw->mbx.v2p_mailbox &= ~mask;
   
           return ret_val;
   }
   
   /**
    * ixgbe_check_for_msg_vf - checks to see if the PF has sent mail
    * @hw: pointer to the HW structure
    * @mbx_id: id of mailbox to check
    *
    * returns SUCCESS if the PF has set the Status bit or else ERR_MBX
    **/
   static s32 ixgbe_check_for_msg_vf(struct ixgbe_hw *hw, u16 mbx_id)
   {
           s32 ret_val = IXGBE_ERR_MBX;
   
           UNREFERENCED_1PARAMETER(mbx_id);
           DEBUGFUNC("ixgbe_check_for_msg_vf");
   
           if (!ixgbe_check_for_bit_vf(hw, IXGBE_VFMAILBOX_PFSTS)) {
                   ret_val = IXGBE_SUCCESS;
                   hw->mbx.stats.reqs++;
           }
   
           return ret_val;
   }
   
   /**
    * ixgbe_check_for_ack_vf - checks to see if the PF has ACK'd
    * @hw: pointer to the HW structure
    * @mbx_id: id of mailbox to check
    *
    * returns SUCCESS if the PF has set the ACK bit or else ERR_MBX
    **/
   static s32 ixgbe_check_for_ack_vf(struct ixgbe_hw *hw, u16 mbx_id)
   {
           s32 ret_val = IXGBE_ERR_MBX;
   
           UNREFERENCED_1PARAMETER(mbx_id);
           DEBUGFUNC("ixgbe_check_for_ack_vf");
   
           if (!ixgbe_check_for_bit_vf(hw, IXGBE_VFMAILBOX_PFACK)) {
                   ret_val = IXGBE_SUCCESS;
                   hw->mbx.stats.acks++;
           }
   
           return ret_val;
   }
   
   /**
    * ixgbe_check_for_rst_vf - checks to see if the PF has reset
    * @hw: pointer to the HW structure
    * @mbx_id: id of mailbox to check
    *
    * returns true if the PF has set the reset done bit or else false
    **/
   static s32 ixgbe_check_for_rst_vf(struct ixgbe_hw *hw, u16 mbx_id)
   {
           s32 ret_val = IXGBE_ERR_MBX;
   
           UNREFERENCED_1PARAMETER(mbx_id);
           DEBUGFUNC("ixgbe_check_for_rst_vf");
   
           if (!ixgbe_check_for_bit_vf(hw, (IXGBE_VFMAILBOX_RSTD |
               IXGBE_VFMAILBOX_RSTI))) {
                   ret_val = IXGBE_SUCCESS;
                   hw->mbx.stats.rsts++;
           }
   
           return ret_val;
   }
   
   /**
    * ixgbe_obtain_mbx_lock_vf - obtain mailbox lock
    * @hw: pointer to the HW structure
    *
    * return SUCCESS if we obtained the mailbox lock
    **/
   static s32 ixgbe_obtain_mbx_lock_vf(struct ixgbe_hw *hw)
   {
           s32 ret_val = IXGBE_ERR_MBX;
   
           DEBUGFUNC("ixgbe_obtain_mbx_lock_vf");
   
           /* Take ownership of the buffer */
           IXGBE_WRITE_REG(hw, IXGBE_VFMAILBOX, IXGBE_VFMAILBOX_VFU);
   
           /* reserve mailbox for vf use */
           if (ixgbe_read_v2p_mailbox(hw) & IXGBE_VFMAILBOX_VFU)
                   ret_val = IXGBE_SUCCESS;
   
           return ret_val;
   }
   
   /**
    * ixgbe_write_mbx_vf - Write a message to the mailbox
    * @hw: pointer to the HW structure
    * @msg: The message buffer
    * @size: Length of buffer
    * @mbx_id: id of mailbox to write
    *
    * returns SUCCESS if it successfully copied message into the buffer
    **/
   static s32 ixgbe_write_mbx_vf(struct ixgbe_hw *hw, u32 *msg, u16 size,
                                 u16 mbx_id)
   {
           s32 ret_val;
           u16 i;
   
           UNREFERENCED_1PARAMETER(mbx_id);
   
           DEBUGFUNC("ixgbe_write_mbx_vf");
   
           /* lock the mailbox to prevent pf/vf race condition */
           ret_val = ixgbe_obtain_mbx_lock_vf(hw);
           if (ret_val)
                   goto out_no_write;
   
           /* flush msg and acks as we are overwriting the message buffer */
           ixgbe_check_for_msg_vf(hw, 0);
           ixgbe_check_for_ack_vf(hw, 0);
   
           /* copy the caller specified message to the mailbox memory buffer */
           for (i = 0; i < size; i++)
                   IXGBE_WRITE_REG_ARRAY(hw, IXGBE_VFMBMEM, i, msg[i]);
   
           /* update stats */
           hw->mbx.stats.msgs_tx++;
   
           /* Drop VFU and interrupt the PF to tell it a message has been sent */
           IXGBE_WRITE_REG(hw, IXGBE_VFMAILBOX, IXGBE_VFMAILBOX_REQ);
   
   out_no_write:
           return ret_val;
   }
   
   /**
    * ixgbe_read_mbx_vf - Reads a message from the inbox intended for vf
    * @hw: pointer to the HW structure
    * @msg: The message buffer
    * @size: Length of buffer
    * @mbx_id: id of mailbox to read
    *
    * returns SUCCESS if it successfully read message from buffer
    **/
   static s32 ixgbe_read_mbx_vf(struct ixgbe_hw *hw, u32 *msg, u16 size,
                                u16 mbx_id)
   {
           s32 ret_val = IXGBE_SUCCESS;
           u16 i;
   
           DEBUGFUNC("ixgbe_read_mbx_vf");
           UNREFERENCED_1PARAMETER(mbx_id);
   
           /* lock the mailbox to prevent pf/vf race condition */
           ret_val = ixgbe_obtain_mbx_lock_vf(hw);
           if (ret_val)
                   goto out_no_read;
   
           /* copy the message from the mailbox memory buffer */
           for (i = 0; i < size; i++)
                   msg[i] = IXGBE_READ_REG_ARRAY(hw, IXGBE_VFMBMEM, i);
   
           /* Acknowledge receipt and release mailbox, then we're done */
           IXGBE_WRITE_REG(hw, IXGBE_VFMAILBOX, IXGBE_VFMAILBOX_ACK);
   
           /* update stats */
           hw->mbx.stats.msgs_rx++;
   
   out_no_read:
           return ret_val;
   }
   
   /**
    * ixgbe_init_mbx_params_vf - set initial values for vf mailbox
    * @hw: pointer to the HW structure
    *
    * Initializes the hw->mbx struct to correct values for vf mailbox
    */
   void ixgbe_init_mbx_params_vf(struct ixgbe_hw *hw)
   {
           struct ixgbe_mbx_info *mbx = &hw->mbx;
   
           /* start mailbox as timed out and let the reset_hw call set the timeout
            * value to begin communications */
           mbx->timeout = 0;
           mbx->usec_delay = IXGBE_VF_MBX_INIT_DELAY;
   
           mbx->size = IXGBE_VFMAILBOX_SIZE;
   
           mbx->ops.read = ixgbe_read_mbx_vf;
           mbx->ops.write = ixgbe_write_mbx_vf;
           mbx->ops.read_posted = ixgbe_read_posted_mbx;
           mbx->ops.write_posted = ixgbe_write_posted_mbx;
           mbx->ops.check_for_msg = ixgbe_check_for_msg_vf;
           mbx->ops.check_for_ack = ixgbe_check_for_ack_vf;
           mbx->ops.check_for_rst = ixgbe_check_for_rst_vf;
   
           mbx->stats.msgs_tx = 0;
           mbx->stats.msgs_rx = 0;
           mbx->stats.reqs = 0;
           mbx->stats.acks = 0;
           mbx->stats.rsts = 0;
   }
   
   static s32 ixgbe_check_for_bit_pf(struct ixgbe_hw *hw, u32 mask, s32 index)
   {
           u32 mbvficr = IXGBE_READ_REG(hw, IXGBE_MBVFICR(index));
           s32 ret_val = IXGBE_ERR_MBX;
   
           if (mbvficr & mask) {
                   ret_val = IXGBE_SUCCESS;
                   IXGBE_WRITE_REG(hw, IXGBE_MBVFICR(index), mask);
           }
   
           return ret_val;
   }
   
   /**
    * ixgbe_check_for_msg_pf - checks to see if the VF has sent mail
    * @hw: pointer to the HW structure
    * @vf_number: the VF index
    *
    * returns SUCCESS if the VF has set the Status bit or else ERR_MBX
    **/
   static s32 ixgbe_check_for_msg_pf(struct ixgbe_hw *hw, u16 vf_number)
   {
           s32 ret_val = IXGBE_ERR_MBX;
           s32 index = IXGBE_MBVFICR_INDEX(vf_number);
           u32 vf_bit = vf_number % 16;
   
           DEBUGFUNC("ixgbe_check_for_msg_pf");
   
           if (!ixgbe_check_for_bit_pf(hw, IXGBE_MBVFICR_VFREQ_VF1 << vf_bit,
                                       index)) {
                   ret_val = IXGBE_SUCCESS;
                   hw->mbx.stats.reqs++;
           }
   
           return ret_val;
   }
   
   /**
    * ixgbe_check_for_ack_pf - checks to see if the VF has ACKed
    * @hw: pointer to the HW structure
    * @vf_number: the VF index
    *
    * returns SUCCESS if the VF has set the Status bit or else ERR_MBX
    **/
   static s32 ixgbe_check_for_ack_pf(struct ixgbe_hw *hw, u16 vf_number)
   {
           s32 ret_val = IXGBE_ERR_MBX;
           s32 index = IXGBE_MBVFICR_INDEX(vf_number);
           u32 vf_bit = vf_number % 16;
   
           DEBUGFUNC("ixgbe_check_for_ack_pf");
   
           if (!ixgbe_check_for_bit_pf(hw, IXGBE_MBVFICR_VFACK_VF1 << vf_bit,
                                       index)) {
                   ret_val = IXGBE_SUCCESS;
                   hw->mbx.stats.acks++;
           }
   
           return ret_val;
   }
   
   /**
    * ixgbe_check_for_rst_pf - checks to see if the VF has reset
    * @hw: pointer to the HW structure
    * @vf_number: the VF index
    *
    * returns SUCCESS if the VF has set the Status bit or else ERR_MBX
    **/
   static s32 ixgbe_check_for_rst_pf(struct ixgbe_hw *hw, u16 vf_number)
   {
           u32 reg_offset = (vf_number < 32) ? 0 : 1;
           u32 vf_shift = vf_number % 32;
           u32 vflre = 0;
           s32 ret_val = IXGBE_ERR_MBX;
   
           DEBUGFUNC("ixgbe_check_for_rst_pf");
   
           switch (hw->mac.type) {
           case ixgbe_mac_82599EB:
                   vflre = IXGBE_READ_REG(hw, IXGBE_VFLRE(reg_offset));
                   break;
           case ixgbe_mac_X550:
           case ixgbe_mac_X550EM_x:
           case ixgbe_mac_X550EM_a:
           case ixgbe_mac_X540:
                   vflre = IXGBE_READ_REG(hw, IXGBE_VFLREC(reg_offset));
                   break;
           default:
                   break;
           }
   
           if (vflre & (1 << vf_shift)) {
                   ret_val = IXGBE_SUCCESS;
                   IXGBE_WRITE_REG(hw, IXGBE_VFLREC(reg_offset), (1 << vf_shift));
                   hw->mbx.stats.rsts++;
           }
   
           return ret_val;
   }
   
   /**
    * ixgbe_obtain_mbx_lock_pf - obtain mailbox lock
    * @hw: pointer to the HW structure
    * @vf_number: the VF index
    *
    * return SUCCESS if we obtained the mailbox lock
    **/
   static s32 ixgbe_obtain_mbx_lock_pf(struct ixgbe_hw *hw, u16 vf_number)
   {
           s32 ret_val = IXGBE_ERR_MBX;
           u32 p2v_mailbox;
   
           DEBUGFUNC("ixgbe_obtain_mbx_lock_pf");
   
           /* Take ownership of the buffer */
           IXGBE_WRITE_REG(hw, IXGBE_PFMAILBOX(vf_number), IXGBE_PFMAILBOX_PFU);
   
           /* reserve mailbox for vf use */
           p2v_mailbox = IXGBE_READ_REG(hw, IXGBE_PFMAILBOX(vf_number));
           if (p2v_mailbox & IXGBE_PFMAILBOX_PFU)
                   ret_val = IXGBE_SUCCESS;
           else
                   ERROR_REPORT2(IXGBE_ERROR_POLLING,
                              "Failed to obtain mailbox lock for VF%d", vf_number);
   
   
           return ret_val;
   }
   
   /**
    * ixgbe_write_mbx_pf - Places a message in the mailbox
    * @hw: pointer to the HW structure
    * @msg: The message buffer
    * @size: Length of buffer
    * @vf_number: the VF index
    *
    * returns SUCCESS if it successfully copied message into the buffer
    **/
   static s32 ixgbe_write_mbx_pf(struct ixgbe_hw *hw, u32 *msg, u16 size,
                                 u16 vf_number)
   {
           s32 ret_val;
           u16 i;
   
           DEBUGFUNC("ixgbe_write_mbx_pf");
   
           /* lock the mailbox to prevent pf/vf race condition */
           ret_val = ixgbe_obtain_mbx_lock_pf(hw, vf_number);
           if (ret_val)
                   goto out_no_write;
   
           /* flush msg and acks as we are overwriting the message buffer */
           ixgbe_check_for_msg_pf(hw, vf_number);
           ixgbe_check_for_ack_pf(hw, vf_number);
   
           /* copy the caller specified message to the mailbox memory buffer */
           for (i = 0; i < size; i++)
                   IXGBE_WRITE_REG_ARRAY(hw, IXGBE_PFMBMEM(vf_number), i, msg[i]);
   
           /* Interrupt VF to tell it a message has been sent and release buffer*/
           IXGBE_WRITE_REG(hw, IXGBE_PFMAILBOX(vf_number), IXGBE_PFMAILBOX_STS);
   
           /* update stats */
           hw->mbx.stats.msgs_tx++;
   
   out_no_write:
           return ret_val;
   
   }
   
   /**
    * ixgbe_read_mbx_pf - Read a message from the mailbox
    * @hw: pointer to the HW structure
    * @msg: The message buffer
    * @size: Length of buffer
    * @vf_number: the VF index
    *
    * This function copies a message from the mailbox buffer to the caller's
    * memory buffer.  The presumption is that the caller knows that there was
    * a message due to a VF request so no polling for message is needed.
    **/
   static s32 ixgbe_read_mbx_pf(struct ixgbe_hw *hw, u32 *msg, u16 size,
                                u16 vf_number)
   {
           s32 ret_val;
           u16 i;
   
           DEBUGFUNC("ixgbe_read_mbx_pf");
   
           /* lock the mailbox to prevent pf/vf race condition */
           ret_val = ixgbe_obtain_mbx_lock_pf(hw, vf_number);
           if (ret_val)
                   goto out_no_read;
   
           /* copy the message to the mailbox memory buffer */
           for (i = 0; i < size; i++)
                   msg[i] = IXGBE_READ_REG_ARRAY(hw, IXGBE_PFMBMEM(vf_number), i);
   
           /* Acknowledge the message and release buffer */
           IXGBE_WRITE_REG(hw, IXGBE_PFMAILBOX(vf_number), IXGBE_PFMAILBOX_ACK);
   
           /* update stats */
           hw->mbx.stats.msgs_rx++;
   
   out_no_read:
           return ret_val;
   }
   
   /**
    * ixgbe_init_mbx_params_pf - set initial values for pf mailbox
    * @hw: pointer to the HW structure
    *
    * Initializes the hw->mbx struct to correct values for pf mailbox
    */
   void ixgbe_init_mbx_params_pf(struct ixgbe_hw *hw)
   {
           struct ixgbe_mbx_info *mbx = &hw->mbx;
   
           if (hw->mac.type != ixgbe_mac_82599EB &&
               hw->mac.type != ixgbe_mac_X550 &&
               hw->mac.type != ixgbe_mac_X550EM_x &&
               hw->mac.type != ixgbe_mac_X550EM_a &&
               hw->mac.type != ixgbe_mac_X540)
                   return;
   
           mbx->timeout = 0;
           mbx->usec_delay = 0;
   
           mbx->size = IXGBE_VFMAILBOX_SIZE;
   
           mbx->ops.read = ixgbe_read_mbx_pf;
           mbx->ops.write = ixgbe_write_mbx_pf;
           mbx->ops.read_posted = ixgbe_read_posted_mbx;
           mbx->ops.write_posted = ixgbe_write_posted_mbx;
           mbx->ops.check_for_msg = ixgbe_check_for_msg_pf;
           mbx->ops.check_for_ack = ixgbe_check_for_ack_pf;
           mbx->ops.check_for_rst = ixgbe_check_for_rst_pf;
   
           mbx->stats.msgs_tx = 0;
           mbx->stats.msgs_rx = 0;
           mbx->stats.reqs = 0;
           mbx->stats.acks = 0;
           mbx->stats.rsts = 0;
   }

Cache object: d0a34e7625b2c23fe2547b1fed5889a7