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336 lines
8.2 KiB
336 lines
8.2 KiB
// 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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