520 lines
13 KiB
C
520 lines
13 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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if (!countdown || !mbx->ops.check_for_msg)
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return IXGBE_ERR_CONFIG;
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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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return countdown ? 0 : IXGBE_ERR_TIMEOUT;
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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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if (!countdown || !mbx->ops.check_for_ack)
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return IXGBE_ERR_CONFIG;
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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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return countdown ? 0 : IXGBE_ERR_TIMEOUT;
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}
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/**
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* ixgbevf_read_mailbox_vf - read VF's mailbox register
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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 mailbox register dedicated for VF without
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* losing the read to clear status bits.
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**/
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static u32 ixgbevf_read_mailbox_vf(struct ixgbe_hw *hw)
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{
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u32 vf_mailbox = IXGBE_READ_REG(hw, IXGBE_VFMAILBOX);
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vf_mailbox |= hw->mbx.vf_mailbox;
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hw->mbx.vf_mailbox |= vf_mailbox & IXGBE_VFMAILBOX_R2C_BITS;
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return vf_mailbox;
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}
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/**
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* ixgbevf_clear_msg_vf - clear PF status bit
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* @hw: pointer to the HW structure
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*
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* This function is used to clear PFSTS bit in the VFMAILBOX register
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**/
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static void ixgbevf_clear_msg_vf(struct ixgbe_hw *hw)
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{
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u32 vf_mailbox = ixgbevf_read_mailbox_vf(hw);
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if (vf_mailbox & IXGBE_VFMAILBOX_PFSTS) {
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hw->mbx.stats.reqs++;
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hw->mbx.vf_mailbox &= ~IXGBE_VFMAILBOX_PFSTS;
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}
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}
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/**
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* ixgbevf_clear_ack_vf - clear PF ACK bit
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* @hw: pointer to the HW structure
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*
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* This function is used to clear PFACK bit in the VFMAILBOX register
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**/
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static void ixgbevf_clear_ack_vf(struct ixgbe_hw *hw)
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{
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u32 vf_mailbox = ixgbevf_read_mailbox_vf(hw);
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if (vf_mailbox & IXGBE_VFMAILBOX_PFACK) {
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hw->mbx.stats.acks++;
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hw->mbx.vf_mailbox &= ~IXGBE_VFMAILBOX_PFACK;
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}
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}
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/**
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* ixgbevf_clear_rst_vf - clear PF reset bit
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* @hw: pointer to the HW structure
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*
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* This function is used to clear reset indication and reset done bit in
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* VFMAILBOX register after reset the shared resources and the reset sequence.
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**/
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static void ixgbevf_clear_rst_vf(struct ixgbe_hw *hw)
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{
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u32 vf_mailbox = ixgbevf_read_mailbox_vf(hw);
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if (vf_mailbox & (IXGBE_VFMAILBOX_RSTI | IXGBE_VFMAILBOX_RSTD)) {
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hw->mbx.stats.rsts++;
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hw->mbx.vf_mailbox &= ~(IXGBE_VFMAILBOX_RSTI |
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IXGBE_VFMAILBOX_RSTD);
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}
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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 vf_mailbox = ixgbevf_read_mailbox_vf(hw);
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s32 ret_val = IXGBE_ERR_MBX;
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if (vf_mailbox & mask)
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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_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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ixgbevf_clear_ack_vf(hw);
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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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ixgbevf_clear_rst_vf(hw);
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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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struct ixgbe_mbx_info *mbx = &hw->mbx;
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s32 ret_val = IXGBE_ERR_CONFIG;
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int countdown = mbx->timeout;
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u32 vf_mailbox;
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if (!mbx->timeout)
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return ret_val;
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while (countdown--) {
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/* Reserve mailbox for VF use */
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vf_mailbox = ixgbevf_read_mailbox_vf(hw);
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vf_mailbox |= IXGBE_VFMAILBOX_VFU;
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IXGBE_WRITE_REG(hw, IXGBE_VFMAILBOX, vf_mailbox);
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/* Verify that VF is the owner of the lock */
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if (ixgbevf_read_mailbox_vf(hw) & IXGBE_VFMAILBOX_VFU) {
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ret_val = 0;
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break;
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}
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/* Wait a bit before trying again */
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udelay(mbx->udelay);
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}
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if (ret_val)
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ret_val = IXGBE_ERR_TIMEOUT;
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return ret_val;
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}
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/**
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* ixgbevf_release_mbx_lock_vf - release mailbox lock
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* @hw: pointer to the HW structure
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**/
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static void ixgbevf_release_mbx_lock_vf(struct ixgbe_hw *hw)
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{
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u32 vf_mailbox;
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/* Return ownership of the buffer */
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vf_mailbox = ixgbevf_read_mailbox_vf(hw);
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vf_mailbox &= ~IXGBE_VFMAILBOX_VFU;
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IXGBE_WRITE_REG(hw, IXGBE_VFMAILBOX, vf_mailbox);
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}
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/**
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* ixgbevf_release_mbx_lock_vf_legacy - release mailbox lock
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* @hw: pointer to the HW structure
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**/
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static void ixgbevf_release_mbx_lock_vf_legacy(struct ixgbe_hw *__always_unused hw)
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{
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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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u32 vf_mailbox;
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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_clear_msg_vf(hw);
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ixgbevf_clear_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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/* interrupt the PF to tell it a message has been sent */
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vf_mailbox = ixgbevf_read_mailbox_vf(hw);
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vf_mailbox |= IXGBE_VFMAILBOX_REQ;
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IXGBE_WRITE_REG(hw, IXGBE_VFMAILBOX, vf_mailbox);
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/* if msg sent wait until we receive an ack */
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ret_val = ixgbevf_poll_for_ack(hw);
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out_no_write:
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hw->mbx.ops.release(hw);
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return ret_val;
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}
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/**
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* ixgbevf_write_mbx_vf_legacy - 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_legacy(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_clear_msg_vf(hw);
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ixgbevf_check_for_ack_vf(hw);
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ixgbevf_clear_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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u32 vf_mailbox;
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s32 ret_val;
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u16 i;
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/* check if there is a message from PF */
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ret_val = ixgbevf_check_for_msg_vf(hw);
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if (ret_val)
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return ret_val;
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ixgbevf_clear_msg_vf(hw);
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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 */
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vf_mailbox = ixgbevf_read_mailbox_vf(hw);
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vf_mailbox |= IXGBE_VFMAILBOX_ACK;
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IXGBE_WRITE_REG(hw, IXGBE_VFMAILBOX, vf_mailbox);
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||
|
|
|
||
|
|
/* update stats */
|
||
|
|
hw->mbx.stats.msgs_rx++;
|
||
|
|
|
||
|
|
return ret_val;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* ixgbevf_read_mbx_vf_legacy - Reads a message from the inbox intended for VF
|
||
|
|
* @hw: pointer to the HW structure
|
||
|
|
* @msg: The message buffer
|
||
|
|
* @size: Length of buffer
|
||
|
|
*
|
||
|
|
* returns 0 if it successfully read message from buffer
|
||
|
|
**/
|
||
|
|
static s32 ixgbevf_read_mbx_vf_legacy(struct ixgbe_hw *hw, u32 *msg, u16 size)
|
||
|
|
{
|
||
|
|
s32 ret_val = 0;
|
||
|
|
u16 i;
|
||
|
|
|
||
|
|
/* lock the mailbox to prevent PF/VF race condition */
|
||
|
|
ret_val = ixgbevf_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;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* ixgbevf_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
|
||
|
|
*/
|
||
|
|
static s32 ixgbevf_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 = IXGBE_VF_MBX_INIT_TIMEOUT;
|
||
|
|
mbx->udelay = IXGBE_VF_MBX_INIT_DELAY;
|
||
|
|
|
||
|
|
mbx->size = IXGBE_VFMAILBOX_SIZE;
|
||
|
|
|
||
|
|
mbx->stats.msgs_tx = 0;
|
||
|
|
mbx->stats.msgs_rx = 0;
|
||
|
|
mbx->stats.reqs = 0;
|
||
|
|
mbx->stats.acks = 0;
|
||
|
|
mbx->stats.rsts = 0;
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* ixgbevf_poll_mbx - Wait for message and read it from the mailbox
|
||
|
|
* @hw: pointer to the HW structure
|
||
|
|
* @msg: The message buffer
|
||
|
|
* @size: Length of buffer
|
||
|
|
*
|
||
|
|
* returns 0 if it successfully read message from buffer
|
||
|
|
**/
|
||
|
|
s32 ixgbevf_poll_mbx(struct ixgbe_hw *hw, u32 *msg, u16 size)
|
||
|
|
{
|
||
|
|
struct ixgbe_mbx_info *mbx = &hw->mbx;
|
||
|
|
s32 ret_val = IXGBE_ERR_CONFIG;
|
||
|
|
|
||
|
|
if (!mbx->ops.read || !mbx->ops.check_for_msg || !mbx->timeout)
|
||
|
|
return ret_val;
|
||
|
|
|
||
|
|
/* limit read to size of mailbox */
|
||
|
|
if (size > mbx->size)
|
||
|
|
size = mbx->size;
|
||
|
|
|
||
|
|
ret_val = ixgbevf_poll_for_msg(hw);
|
||
|
|
/* if ack received read message, otherwise we timed out */
|
||
|
|
if (!ret_val)
|
||
|
|
ret_val = mbx->ops.read(hw, msg, size);
|
||
|
|
|
||
|
|
return ret_val;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* ixgbevf_write_mbx - Write a message to the mailbox and wait for ACK
|
||
|
|
* @hw: pointer to the HW structure
|
||
|
|
* @msg: The message buffer
|
||
|
|
* @size: Length of buffer
|
||
|
|
*
|
||
|
|
* returns 0 if it successfully copied message into the buffer and
|
||
|
|
* received an ACK to that message within specified period
|
||
|
|
**/
|
||
|
|
s32 ixgbevf_write_mbx(struct ixgbe_hw *hw, u32 *msg, u16 size)
|
||
|
|
{
|
||
|
|
struct ixgbe_mbx_info *mbx = &hw->mbx;
|
||
|
|
s32 ret_val = IXGBE_ERR_CONFIG;
|
||
|
|
|
||
|
|
/**
|
||
|
|
* exit if either we can't write, release
|
||
|
|
* or there is no timeout defined
|
||
|
|
*/
|
||
|
|
if (!mbx->ops.write || !mbx->ops.check_for_ack || !mbx->ops.release ||
|
||
|
|
!mbx->timeout)
|
||
|
|
return ret_val;
|
||
|
|
|
||
|
|
if (size > mbx->size)
|
||
|
|
ret_val = IXGBE_ERR_PARAM;
|
||
|
|
else
|
||
|
|
ret_val = mbx->ops.write(hw, msg, size);
|
||
|
|
|
||
|
|
return ret_val;
|
||
|
|
}
|
||
|
|
|
||
|
|
const struct ixgbe_mbx_operations ixgbevf_mbx_ops = {
|
||
|
|
.init_params = ixgbevf_init_mbx_params_vf,
|
||
|
|
.release = ixgbevf_release_mbx_lock_vf,
|
||
|
|
.read = ixgbevf_read_mbx_vf,
|
||
|
|
.write = ixgbevf_write_mbx_vf,
|
||
|
|
.check_for_msg = ixgbevf_check_for_msg_vf,
|
||
|
|
.check_for_ack = ixgbevf_check_for_ack_vf,
|
||
|
|
.check_for_rst = ixgbevf_check_for_rst_vf,
|
||
|
|
};
|
||
|
|
|
||
|
|
const struct ixgbe_mbx_operations ixgbevf_mbx_ops_legacy = {
|
||
|
|
.init_params = ixgbevf_init_mbx_params_vf,
|
||
|
|
.release = ixgbevf_release_mbx_lock_vf_legacy,
|
||
|
|
.read = ixgbevf_read_mbx_vf_legacy,
|
||
|
|
.write = ixgbevf_write_mbx_vf_legacy,
|
||
|
|
.check_for_msg = ixgbevf_check_for_msg_vf,
|
||
|
|
.check_for_ack = ixgbevf_check_for_ack_vf,
|
||
|
|
.check_for_rst = ixgbevf_check_for_rst_vf,
|
||
|
|
};
|
||
|
|
|
||
|
|
/* Mailbox operations when running on Hyper-V.
|
||
|
|
* On Hyper-V, PF/VF communication is not through the
|
||
|
|
* hardware mailbox; this communication is through
|
||
|
|
* a software mediated path.
|
||
|
|
* Most mail box operations are noop while running on
|
||
|
|
* Hyper-V.
|
||
|
|
*/
|
||
|
|
const struct ixgbe_mbx_operations ixgbevf_hv_mbx_ops = {
|
||
|
|
.init_params = ixgbevf_init_mbx_params_vf,
|
||
|
|
.check_for_rst = ixgbevf_check_for_rst_vf,
|
||
|
|
};
|