337 lines
8.2 KiB
C
337 lines
8.2 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/* Copyright(c) 1999 - 2018 Intel Corporation. */
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#include "mbx.h"
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#include "ixgbevf.h"
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/**
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* ixgbevf_poll_for_msg - Wait for message notification
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* @hw: pointer to the HW structure
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*
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* returns 0 if it successfully received a message notification
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**/
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static s32 ixgbevf_poll_for_msg(struct ixgbe_hw *hw)
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{
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struct ixgbe_mbx_info *mbx = &hw->mbx;
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int countdown = mbx->timeout;
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while (countdown && mbx->ops.check_for_msg(hw)) {
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countdown--;
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udelay(mbx->udelay);
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}
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/* if we failed, all future posted messages fail until reset */
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if (!countdown)
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mbx->timeout = 0;
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return countdown ? 0 : IXGBE_ERR_MBX;
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}
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/**
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* ixgbevf_poll_for_ack - Wait for message acknowledgment
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* @hw: pointer to the HW structure
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*
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* returns 0 if it successfully received a message acknowledgment
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**/
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static s32 ixgbevf_poll_for_ack(struct ixgbe_hw *hw)
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{
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struct ixgbe_mbx_info *mbx = &hw->mbx;
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int countdown = mbx->timeout;
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while (countdown && mbx->ops.check_for_ack(hw)) {
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countdown--;
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udelay(mbx->udelay);
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}
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/* if we failed, all future posted messages fail until reset */
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if (!countdown)
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mbx->timeout = 0;
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return countdown ? 0 : IXGBE_ERR_MBX;
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}
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/**
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* ixgbevf_read_posted_mbx - Wait for message notification and receive message
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* @hw: pointer to the HW structure
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* @msg: The message buffer
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* @size: Length of buffer
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*
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* returns 0 if it successfully received a message notification and
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* copied it into the receive buffer.
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**/
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static s32 ixgbevf_read_posted_mbx(struct ixgbe_hw *hw, u32 *msg, u16 size)
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{
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struct ixgbe_mbx_info *mbx = &hw->mbx;
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s32 ret_val = IXGBE_ERR_MBX;
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if (!mbx->ops.read)
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goto out;
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ret_val = ixgbevf_poll_for_msg(hw);
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/* if ack received read message, otherwise we timed out */
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if (!ret_val)
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ret_val = mbx->ops.read(hw, msg, size);
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out:
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return ret_val;
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}
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/**
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* ixgbevf_write_posted_mbx - Write a message to the mailbox, wait for ack
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* @hw: pointer to the HW structure
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* @msg: The message buffer
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* @size: Length of buffer
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*
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* returns 0 if it successfully copied message into the buffer and
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* received an ack to that message within delay * timeout period
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**/
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static s32 ixgbevf_write_posted_mbx(struct ixgbe_hw *hw, u32 *msg, u16 size)
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{
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struct ixgbe_mbx_info *mbx = &hw->mbx;
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s32 ret_val = IXGBE_ERR_MBX;
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/* exit if either we can't write or there isn't a defined timeout */
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if (!mbx->ops.write || !mbx->timeout)
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goto out;
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/* send msg */
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ret_val = mbx->ops.write(hw, msg, size);
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/* if msg sent wait until we receive an ack */
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if (!ret_val)
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ret_val = ixgbevf_poll_for_ack(hw);
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out:
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return ret_val;
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}
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/**
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* ixgbevf_read_v2p_mailbox - read v2p mailbox
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* @hw: pointer to the HW structure
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*
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* This function is used to read the v2p mailbox without losing the read to
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* clear status bits.
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**/
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static u32 ixgbevf_read_v2p_mailbox(struct ixgbe_hw *hw)
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{
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u32 v2p_mailbox = IXGBE_READ_REG(hw, IXGBE_VFMAILBOX);
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v2p_mailbox |= hw->mbx.v2p_mailbox;
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hw->mbx.v2p_mailbox |= v2p_mailbox & IXGBE_VFMAILBOX_R2C_BITS;
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return v2p_mailbox;
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}
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/**
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* ixgbevf_check_for_bit_vf - Determine if a status bit was set
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* @hw: pointer to the HW structure
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* @mask: bitmask for bits to be tested and cleared
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*
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* This function is used to check for the read to clear bits within
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* the V2P mailbox.
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**/
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static s32 ixgbevf_check_for_bit_vf(struct ixgbe_hw *hw, u32 mask)
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{
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u32 v2p_mailbox = ixgbevf_read_v2p_mailbox(hw);
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s32 ret_val = IXGBE_ERR_MBX;
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if (v2p_mailbox & mask)
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ret_val = 0;
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hw->mbx.v2p_mailbox &= ~mask;
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return ret_val;
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}
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/**
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* ixgbevf_check_for_msg_vf - checks to see if the PF has sent mail
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* @hw: pointer to the HW structure
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*
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* returns 0 if the PF has set the Status bit or else ERR_MBX
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**/
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static s32 ixgbevf_check_for_msg_vf(struct ixgbe_hw *hw)
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{
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s32 ret_val = IXGBE_ERR_MBX;
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if (!ixgbevf_check_for_bit_vf(hw, IXGBE_VFMAILBOX_PFSTS)) {
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ret_val = 0;
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hw->mbx.stats.reqs++;
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}
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return ret_val;
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}
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/**
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* ixgbevf_check_for_ack_vf - checks to see if the PF has ACK'd
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* @hw: pointer to the HW structure
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*
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* returns 0 if the PF has set the ACK bit or else ERR_MBX
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**/
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static s32 ixgbevf_check_for_ack_vf(struct ixgbe_hw *hw)
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{
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s32 ret_val = IXGBE_ERR_MBX;
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if (!ixgbevf_check_for_bit_vf(hw, IXGBE_VFMAILBOX_PFACK)) {
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ret_val = 0;
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hw->mbx.stats.acks++;
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}
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return ret_val;
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}
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/**
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* ixgbevf_check_for_rst_vf - checks to see if the PF has reset
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* @hw: pointer to the HW structure
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*
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* returns true if the PF has set the reset done bit or else false
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**/
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static s32 ixgbevf_check_for_rst_vf(struct ixgbe_hw *hw)
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{
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s32 ret_val = IXGBE_ERR_MBX;
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if (!ixgbevf_check_for_bit_vf(hw, (IXGBE_VFMAILBOX_RSTD |
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IXGBE_VFMAILBOX_RSTI))) {
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ret_val = 0;
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hw->mbx.stats.rsts++;
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}
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return ret_val;
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}
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/**
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* ixgbevf_obtain_mbx_lock_vf - obtain mailbox lock
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* @hw: pointer to the HW structure
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*
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* return 0 if we obtained the mailbox lock
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**/
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static s32 ixgbevf_obtain_mbx_lock_vf(struct ixgbe_hw *hw)
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{
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s32 ret_val = IXGBE_ERR_MBX;
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/* Take ownership of the buffer */
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IXGBE_WRITE_REG(hw, IXGBE_VFMAILBOX, IXGBE_VFMAILBOX_VFU);
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/* reserve mailbox for VF use */
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if (ixgbevf_read_v2p_mailbox(hw) & IXGBE_VFMAILBOX_VFU)
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ret_val = 0;
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return ret_val;
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}
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/**
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* ixgbevf_write_mbx_vf - Write a message to the mailbox
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* @hw: pointer to the HW structure
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* @msg: The message buffer
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* @size: Length of buffer
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*
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* returns 0 if it successfully copied message into the buffer
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**/
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static s32 ixgbevf_write_mbx_vf(struct ixgbe_hw *hw, u32 *msg, u16 size)
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{
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s32 ret_val;
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u16 i;
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/* lock the mailbox to prevent PF/VF race condition */
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ret_val = ixgbevf_obtain_mbx_lock_vf(hw);
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if (ret_val)
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goto out_no_write;
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/* flush msg and acks as we are overwriting the message buffer */
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ixgbevf_check_for_msg_vf(hw);
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ixgbevf_check_for_ack_vf(hw);
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/* copy the caller specified message to the mailbox memory buffer */
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for (i = 0; i < size; i++)
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IXGBE_WRITE_REG_ARRAY(hw, IXGBE_VFMBMEM, i, msg[i]);
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/* update stats */
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hw->mbx.stats.msgs_tx++;
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/* Drop VFU and interrupt the PF to tell it a message has been sent */
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IXGBE_WRITE_REG(hw, IXGBE_VFMAILBOX, IXGBE_VFMAILBOX_REQ);
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out_no_write:
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return ret_val;
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}
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/**
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* ixgbevf_read_mbx_vf - Reads a message from the inbox intended for VF
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* @hw: pointer to the HW structure
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* @msg: The message buffer
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* @size: Length of buffer
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*
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* returns 0 if it successfully read message from buffer
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**/
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static s32 ixgbevf_read_mbx_vf(struct ixgbe_hw *hw, u32 *msg, u16 size)
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{
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s32 ret_val = 0;
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u16 i;
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/* lock the mailbox to prevent PF/VF race condition */
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ret_val = ixgbevf_obtain_mbx_lock_vf(hw);
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if (ret_val)
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goto out_no_read;
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/* copy the message from the mailbox memory buffer */
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for (i = 0; i < size; i++)
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msg[i] = IXGBE_READ_REG_ARRAY(hw, IXGBE_VFMBMEM, i);
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/* Acknowledge receipt and release mailbox, then we're done */
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IXGBE_WRITE_REG(hw, IXGBE_VFMAILBOX, IXGBE_VFMAILBOX_ACK);
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/* update stats */
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hw->mbx.stats.msgs_rx++;
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out_no_read:
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return ret_val;
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}
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/**
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* ixgbevf_init_mbx_params_vf - set initial values for VF mailbox
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* @hw: pointer to the HW structure
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*
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* Initializes the hw->mbx struct to correct values for VF mailbox
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*/
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static s32 ixgbevf_init_mbx_params_vf(struct ixgbe_hw *hw)
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{
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struct ixgbe_mbx_info *mbx = &hw->mbx;
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/* start mailbox as timed out and let the reset_hw call set the timeout
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* value to begin communications
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*/
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mbx->timeout = 0;
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mbx->udelay = IXGBE_VF_MBX_INIT_DELAY;
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mbx->size = IXGBE_VFMAILBOX_SIZE;
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mbx->stats.msgs_tx = 0;
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mbx->stats.msgs_rx = 0;
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mbx->stats.reqs = 0;
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mbx->stats.acks = 0;
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mbx->stats.rsts = 0;
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return 0;
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}
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const struct ixgbe_mbx_operations ixgbevf_mbx_ops = {
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.init_params = ixgbevf_init_mbx_params_vf,
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.read = ixgbevf_read_mbx_vf,
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.write = ixgbevf_write_mbx_vf,
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.read_posted = ixgbevf_read_posted_mbx,
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.write_posted = ixgbevf_write_posted_mbx,
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.check_for_msg = ixgbevf_check_for_msg_vf,
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.check_for_ack = ixgbevf_check_for_ack_vf,
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.check_for_rst = ixgbevf_check_for_rst_vf,
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};
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/* Mailbox operations when running on Hyper-V.
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* On Hyper-V, PF/VF communication is not through the
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* hardware mailbox; this communication is through
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* a software mediated path.
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* Most mail box operations are noop while running on
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* Hyper-V.
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*/
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const struct ixgbe_mbx_operations ixgbevf_hv_mbx_ops = {
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.init_params = ixgbevf_init_mbx_params_vf,
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.check_for_rst = ixgbevf_check_for_rst_vf,
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};
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