ixgbevf: Mailbox communication
The 82599 virtual function device and the master 82599 physical function device implement a mailbox utility for communication between the devices using some SRAM scratch memory and a doorbell/answering mechanism enabled via interrupt and/or polling. This C module and accompanying header file implement the base functions for use of this feature. Signed-off-by: Greg Rose <gregory.v.rose@intel.com> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Greg Rose
David S. Miller
Родитель
3047f90bd5
Коммит
cbf698dbba
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/*******************************************************************************
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Intel 82599 Virtual Function driver
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Copyright(c) 1999 - 2009 Intel Corporation.
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This program is free software; you can redistribute it and/or modify it
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under the terms and conditions of the GNU General Public License,
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version 2, as published by the Free Software Foundation.
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This program is distributed in the hope it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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more details.
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You should have received a copy of the GNU General Public License along with
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this program; if not, write to the Free Software Foundation, Inc.,
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51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
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The full GNU General Public License is included in this distribution in
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the file called "COPYING".
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Contact Information:
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e1000-devel Mailing List <e1000-devel@lists.sourceforge.net>
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Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
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*******************************************************************************/
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#include "mbx.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 acknowledgement
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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 acknowledgement
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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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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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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;
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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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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 successfuly 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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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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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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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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|
@ -0,0 +1,100 @@
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||||||
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/*******************************************************************************
|
||||||
|
|
||||||
|
Intel 82599 Virtual Function driver
|
||||||
|
Copyright(c) 1999 - 2009 Intel Corporation.
|
||||||
|
|
||||||
|
This program is free software; you can redistribute it and/or modify it
|
||||||
|
under the terms and conditions of the GNU General Public License,
|
||||||
|
version 2, as published by the Free Software Foundation.
|
||||||
|
|
||||||
|
This program is distributed in the hope it will be useful, but WITHOUT
|
||||||
|
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
||||||
|
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
|
||||||
|
more details.
|
||||||
|
|
||||||
|
You should have received a copy of the GNU General Public License along with
|
||||||
|
this program; if not, write to the Free Software Foundation, Inc.,
|
||||||
|
51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
|
||||||
|
|
||||||
|
The full GNU General Public License is included in this distribution in
|
||||||
|
the file called "COPYING".
|
||||||
|
|
||||||
|
Contact Information:
|
||||||
|
e1000-devel Mailing List <e1000-devel@lists.sourceforge.net>
|
||||||
|
Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
|
||||||
|
|
||||||
|
*******************************************************************************/
|
||||||
|
|
||||||
|
#ifndef _IXGBE_MBX_H_
|
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|
#define _IXGBE_MBX_H_
|
||||||
|
|
||||||
|
#include "vf.h"
|
||||||
|
|
||||||
|
#define IXGBE_VFMAILBOX_SIZE 16 /* 16 32 bit words - 64 bytes */
|
||||||
|
#define IXGBE_ERR_MBX -100
|
||||||
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|
||||||
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#define IXGBE_VFMAILBOX 0x002FC
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#define IXGBE_VFMBMEM 0x00200
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||||||
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||||||
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/* Define mailbox register bits */
|
||||||
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#define IXGBE_VFMAILBOX_REQ 0x00000001 /* Request for PF Ready bit */
|
||||||
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#define IXGBE_VFMAILBOX_ACK 0x00000002 /* Ack PF message received */
|
||||||
|
#define IXGBE_VFMAILBOX_VFU 0x00000004 /* VF owns the mailbox buffer */
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||||||
|
#define IXGBE_VFMAILBOX_PFU 0x00000008 /* PF owns the mailbox buffer */
|
||||||
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#define IXGBE_VFMAILBOX_PFSTS 0x00000010 /* PF wrote a message in the MB */
|
||||||
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#define IXGBE_VFMAILBOX_PFACK 0x00000020 /* PF ack the previous VF msg */
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||||||
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#define IXGBE_VFMAILBOX_RSTI 0x00000040 /* PF has reset indication */
|
||||||
|
#define IXGBE_VFMAILBOX_RSTD 0x00000080 /* PF has indicated reset done */
|
||||||
|
#define IXGBE_VFMAILBOX_R2C_BITS 0x000000B0 /* All read to clear bits */
|
||||||
|
|
||||||
|
#define IXGBE_PFMAILBOX(x) (0x04B00 + (4 * x))
|
||||||
|
#define IXGBE_PFMBMEM(vfn) (0x13000 + (64 * vfn))
|
||||||
|
|
||||||
|
#define IXGBE_PFMAILBOX_STS 0x00000001 /* Initiate message send to VF */
|
||||||
|
#define IXGBE_PFMAILBOX_ACK 0x00000002 /* Ack message recv'd from VF */
|
||||||
|
#define IXGBE_PFMAILBOX_VFU 0x00000004 /* VF owns the mailbox buffer */
|
||||||
|
#define IXGBE_PFMAILBOX_PFU 0x00000008 /* PF owns the mailbox buffer */
|
||||||
|
#define IXGBE_PFMAILBOX_RVFU 0x00000010 /* Reset VFU - used when VF stuck */
|
||||||
|
|
||||||
|
#define IXGBE_MBVFICR_VFREQ_MASK 0x0000FFFF /* bits for VF messages */
|
||||||
|
#define IXGBE_MBVFICR_VFREQ_VF1 0x00000001 /* bit for VF 1 message */
|
||||||
|
#define IXGBE_MBVFICR_VFACK_MASK 0xFFFF0000 /* bits for VF acks */
|
||||||
|
#define IXGBE_MBVFICR_VFACK_VF1 0x00010000 /* bit for VF 1 ack */
|
||||||
|
|
||||||
|
|
||||||
|
/* If it's a IXGBE_VF_* msg then it originates in the VF and is sent to the
|
||||||
|
* PF. The reverse is true if it is IXGBE_PF_*.
|
||||||
|
* Message ACK's are the value or'd with 0xF0000000
|
||||||
|
*/
|
||||||
|
#define IXGBE_VT_MSGTYPE_ACK 0x80000000 /* Messages below or'd with
|
||||||
|
* this are the ACK */
|
||||||
|
#define IXGBE_VT_MSGTYPE_NACK 0x40000000 /* Messages below or'd with
|
||||||
|
* this are the NACK */
|
||||||
|
#define IXGBE_VT_MSGTYPE_CTS 0x20000000 /* Indicates that VF is still
|
||||||
|
* clear to send requests */
|
||||||
|
#define IXGBE_VT_MSGINFO_SHIFT 16
|
||||||
|
/* bits 23:16 are used for exra info for certain messages */
|
||||||
|
#define IXGBE_VT_MSGINFO_MASK (0xFF << IXGBE_VT_MSGINFO_SHIFT)
|
||||||
|
|
||||||
|
#define IXGBE_VF_RESET 0x01 /* VF requests reset */
|
||||||
|
#define IXGBE_VF_SET_MAC_ADDR 0x02 /* VF requests PF to set MAC addr */
|
||||||
|
#define IXGBE_VF_SET_MULTICAST 0x03 /* VF requests PF to set MC addr */
|
||||||
|
#define IXGBE_VF_SET_VLAN 0x04 /* VF requests PF to set VLAN */
|
||||||
|
#define IXGBE_VF_SET_LPE 0x05 /* VF requests PF to set VMOLR.LPE */
|
||||||
|
|
||||||
|
/* length of permanent address message returned from PF */
|
||||||
|
#define IXGBE_VF_PERMADDR_MSG_LEN 4
|
||||||
|
/* word in permanent address message with the current multicast type */
|
||||||
|
#define IXGBE_VF_MC_TYPE_WORD 3
|
||||||
|
|
||||||
|
#define IXGBE_PF_CONTROL_MSG 0x0100 /* PF control message */
|
||||||
|
|
||||||
|
#define IXGBE_VF_MBX_INIT_TIMEOUT 2000 /* number of retries on mailbox */
|
||||||
|
#define IXGBE_VF_MBX_INIT_DELAY 500 /* microseconds between retries */
|
||||||
|
|
||||||
|
/* forward declaration of the HW struct */
|
||||||
|
struct ixgbe_hw;
|
||||||
|
|
||||||
|
s32 ixgbevf_init_mbx_params_vf(struct ixgbe_hw *);
|
||||||
|
|
||||||
|
#endif /* _IXGBE_MBX_H_ */
|
||||||
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