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3272686c98
The mailbox timeout routines need to be updated as they were not correctly handling the case of a mailbox timeout and could cause issues with long delays when used. Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
449 lines
11 KiB
C
449 lines
11 KiB
C
/*******************************************************************************
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Intel(R) Gigabit Ethernet Linux driver
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Copyright(c) 2007-2009 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 "e1000_mbx.h"
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/**
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* igb_read_mbx - Reads a message from 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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* @mbx_id: id of mailbox to read
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*
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* returns SUCCESS if it successfuly read message from buffer
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**/
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s32 igb_read_mbx(struct e1000_hw *hw, u32 *msg, u16 size, u16 mbx_id)
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{
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struct e1000_mbx_info *mbx = &hw->mbx;
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s32 ret_val = -E1000_ERR_MBX;
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/* limit read to size of mailbox */
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if (size > mbx->size)
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size = mbx->size;
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if (mbx->ops.read)
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ret_val = mbx->ops.read(hw, msg, size, mbx_id);
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return ret_val;
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}
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/**
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* igb_write_mbx - 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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* @mbx_id: id of mailbox to write
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*
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* returns SUCCESS if it successfully copied message into the buffer
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**/
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s32 igb_write_mbx(struct e1000_hw *hw, u32 *msg, u16 size, u16 mbx_id)
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{
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struct e1000_mbx_info *mbx = &hw->mbx;
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s32 ret_val = 0;
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if (size > mbx->size)
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ret_val = -E1000_ERR_MBX;
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else if (mbx->ops.write)
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ret_val = mbx->ops.write(hw, msg, size, mbx_id);
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return ret_val;
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}
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/**
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* igb_check_for_msg - checks to see if someone sent us mail
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* @hw: pointer to the HW structure
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* @mbx_id: id of mailbox to check
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*
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* returns SUCCESS if the Status bit was found or else ERR_MBX
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**/
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s32 igb_check_for_msg(struct e1000_hw *hw, u16 mbx_id)
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{
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struct e1000_mbx_info *mbx = &hw->mbx;
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s32 ret_val = -E1000_ERR_MBX;
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if (mbx->ops.check_for_msg)
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ret_val = mbx->ops.check_for_msg(hw, mbx_id);
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return ret_val;
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}
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/**
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* igb_check_for_ack - checks to see if someone sent us ACK
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* @hw: pointer to the HW structure
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* @mbx_id: id of mailbox to check
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*
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* returns SUCCESS if the Status bit was found or else ERR_MBX
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**/
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s32 igb_check_for_ack(struct e1000_hw *hw, u16 mbx_id)
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{
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struct e1000_mbx_info *mbx = &hw->mbx;
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s32 ret_val = -E1000_ERR_MBX;
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if (mbx->ops.check_for_ack)
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ret_val = mbx->ops.check_for_ack(hw, mbx_id);
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return ret_val;
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}
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/**
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* igb_check_for_rst - checks to see if other side has reset
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* @hw: pointer to the HW structure
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* @mbx_id: id of mailbox to check
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*
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* returns SUCCESS if the Status bit was found or else ERR_MBX
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**/
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s32 igb_check_for_rst(struct e1000_hw *hw, u16 mbx_id)
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{
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struct e1000_mbx_info *mbx = &hw->mbx;
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s32 ret_val = -E1000_ERR_MBX;
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if (mbx->ops.check_for_rst)
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ret_val = mbx->ops.check_for_rst(hw, mbx_id);
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return ret_val;
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}
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/**
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* igb_poll_for_msg - Wait for message notification
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* @hw: pointer to the HW structure
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* @mbx_id: id of mailbox to write
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*
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* returns SUCCESS if it successfully received a message notification
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**/
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static s32 igb_poll_for_msg(struct e1000_hw *hw, u16 mbx_id)
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{
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struct e1000_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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goto out;
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while (countdown && mbx->ops.check_for_msg(hw, mbx_id)) {
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countdown--;
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if (!countdown)
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break;
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udelay(mbx->usec_delay);
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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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out:
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return countdown ? 0 : -E1000_ERR_MBX;
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}
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/**
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* igb_poll_for_ack - Wait for message acknowledgement
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* @hw: pointer to the HW structure
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* @mbx_id: id of mailbox to write
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*
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* returns SUCCESS if it successfully received a message acknowledgement
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**/
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static s32 igb_poll_for_ack(struct e1000_hw *hw, u16 mbx_id)
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{
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struct e1000_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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goto out;
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while (countdown && mbx->ops.check_for_ack(hw, mbx_id)) {
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countdown--;
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if (!countdown)
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break;
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udelay(mbx->usec_delay);
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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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out:
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return countdown ? 0 : -E1000_ERR_MBX;
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}
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/**
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* igb_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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* @mbx_id: id of mailbox to write
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*
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* returns SUCCESS 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 igb_read_posted_mbx(struct e1000_hw *hw, u32 *msg, u16 size, u16 mbx_id)
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{
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struct e1000_mbx_info *mbx = &hw->mbx;
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s32 ret_val = -E1000_ERR_MBX;
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if (!mbx->ops.read)
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goto out;
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ret_val = igb_poll_for_msg(hw, mbx_id);
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if (!ret_val)
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ret_val = mbx->ops.read(hw, msg, size, mbx_id);
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out:
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return ret_val;
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}
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/**
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* igb_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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* @mbx_id: id of mailbox to write
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*
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* returns SUCCESS 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 igb_write_posted_mbx(struct e1000_hw *hw, u32 *msg, u16 size, u16 mbx_id)
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{
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struct e1000_mbx_info *mbx = &hw->mbx;
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s32 ret_val = -E1000_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, mbx_id);
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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 = igb_poll_for_ack(hw, mbx_id);
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out:
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return ret_val;
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}
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static s32 igb_check_for_bit_pf(struct e1000_hw *hw, u32 mask)
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{
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u32 mbvficr = rd32(E1000_MBVFICR);
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s32 ret_val = -E1000_ERR_MBX;
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if (mbvficr & mask) {
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ret_val = 0;
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wr32(E1000_MBVFICR, mask);
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}
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return ret_val;
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}
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/**
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* igb_check_for_msg_pf - checks to see if the VF has sent mail
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* @hw: pointer to the HW structure
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* @vf_number: the VF index
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*
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* returns SUCCESS if the VF has set the Status bit or else ERR_MBX
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**/
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static s32 igb_check_for_msg_pf(struct e1000_hw *hw, u16 vf_number)
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{
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s32 ret_val = -E1000_ERR_MBX;
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if (!igb_check_for_bit_pf(hw, E1000_MBVFICR_VFREQ_VF1 << vf_number)) {
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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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* igb_check_for_ack_pf - checks to see if the VF has ACKed
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* @hw: pointer to the HW structure
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* @vf_number: the VF index
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*
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* returns SUCCESS if the VF has set the Status bit or else ERR_MBX
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**/
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static s32 igb_check_for_ack_pf(struct e1000_hw *hw, u16 vf_number)
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{
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s32 ret_val = -E1000_ERR_MBX;
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if (!igb_check_for_bit_pf(hw, E1000_MBVFICR_VFACK_VF1 << vf_number)) {
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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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* igb_check_for_rst_pf - checks to see if the VF has reset
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* @hw: pointer to the HW structure
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* @vf_number: the VF index
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*
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* returns SUCCESS if the VF has set the Status bit or else ERR_MBX
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**/
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static s32 igb_check_for_rst_pf(struct e1000_hw *hw, u16 vf_number)
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{
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u32 vflre = rd32(E1000_VFLRE);
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s32 ret_val = -E1000_ERR_MBX;
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if (vflre & (1 << vf_number)) {
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ret_val = 0;
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wr32(E1000_VFLRE, (1 << vf_number));
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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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* igb_obtain_mbx_lock_pf - obtain mailbox lock
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* @hw: pointer to the HW structure
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* @vf_number: the VF index
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*
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* return SUCCESS if we obtained the mailbox lock
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**/
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static s32 igb_obtain_mbx_lock_pf(struct e1000_hw *hw, u16 vf_number)
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{
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s32 ret_val = -E1000_ERR_MBX;
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u32 p2v_mailbox;
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/* Take ownership of the buffer */
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wr32(E1000_P2VMAILBOX(vf_number), E1000_P2VMAILBOX_PFU);
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/* reserve mailbox for vf use */
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p2v_mailbox = rd32(E1000_P2VMAILBOX(vf_number));
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if (p2v_mailbox & E1000_P2VMAILBOX_PFU)
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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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* igb_write_mbx_pf - Places a message in 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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* @vf_number: the VF index
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*
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* returns SUCCESS if it successfully copied message into the buffer
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**/
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static s32 igb_write_mbx_pf(struct e1000_hw *hw, u32 *msg, u16 size,
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u16 vf_number)
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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 = igb_obtain_mbx_lock_pf(hw, vf_number);
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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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igb_check_for_msg_pf(hw, vf_number);
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igb_check_for_ack_pf(hw, vf_number);
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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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array_wr32(E1000_VMBMEM(vf_number), i, msg[i]);
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/* Interrupt VF to tell it a message has been sent and release buffer*/
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wr32(E1000_P2VMAILBOX(vf_number), E1000_P2VMAILBOX_STS);
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/* update stats */
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hw->mbx.stats.msgs_tx++;
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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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* igb_read_mbx_pf - Read a message from 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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* @vf_number: the VF index
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*
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* This function copies a message from the mailbox buffer to the caller's
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* memory buffer. The presumption is that the caller knows that there was
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* a message due to a VF request so no polling for message is needed.
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**/
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static s32 igb_read_mbx_pf(struct e1000_hw *hw, u32 *msg, u16 size,
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u16 vf_number)
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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 = igb_obtain_mbx_lock_pf(hw, vf_number);
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if (ret_val)
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goto out_no_read;
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/* copy the message to the mailbox memory buffer */
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for (i = 0; i < size; i++)
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msg[i] = array_rd32(E1000_VMBMEM(vf_number), i);
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/* Acknowledge the message and release buffer */
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wr32(E1000_P2VMAILBOX(vf_number), E1000_P2VMAILBOX_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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* e1000_init_mbx_params_pf - set initial values for pf 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 pf mailbox
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*/
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s32 igb_init_mbx_params_pf(struct e1000_hw *hw)
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{
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struct e1000_mbx_info *mbx = &hw->mbx;
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if (hw->mac.type == e1000_82576) {
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mbx->timeout = 0;
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mbx->usec_delay = 0;
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mbx->size = E1000_VFMAILBOX_SIZE;
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mbx->ops.read = igb_read_mbx_pf;
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mbx->ops.write = igb_write_mbx_pf;
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mbx->ops.read_posted = igb_read_posted_mbx;
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mbx->ops.write_posted = igb_write_posted_mbx;
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mbx->ops.check_for_msg = igb_check_for_msg_pf;
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mbx->ops.check_for_ack = igb_check_for_ack_pf;
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mbx->ops.check_for_rst = igb_check_for_rst_pf;
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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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}
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return 0;
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}
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