--- /dev/null
+/*******************************************************************************
+
+ Intel 82599 Virtual Function driver
+ Copyright(c) 1999 - 2015 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, see <http://www.gnu.org/licenses/>.
+
+ 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
+
+*******************************************************************************/
+
+#include "mbx.h"
+#include "ixgbevf.h"
+
+/**
+ * ixgbevf_poll_for_msg - Wait for message notification
+ * @hw: pointer to the HW structure
+ *
+ * returns 0 if it successfully received a message notification
+ **/
+static s32 ixgbevf_poll_for_msg(struct ixgbe_hw *hw)
+{
+ struct ixgbe_mbx_info *mbx = &hw->mbx;
+ int countdown = mbx->timeout;
+
+ while (countdown && mbx->ops.check_for_msg(hw)) {
+ countdown--;
+ udelay(mbx->udelay);
+ }
+
+ /* if we failed, all future posted messages fail until reset */
+ if (!countdown)
+ mbx->timeout = 0;
+
+ return countdown ? 0 : IXGBE_ERR_MBX;
+}
+
+/**
+ * ixgbevf_poll_for_ack - Wait for message acknowledgment
+ * @hw: pointer to the HW structure
+ *
+ * returns 0 if it successfully received a message acknowledgment
+ **/
+static s32 ixgbevf_poll_for_ack(struct ixgbe_hw *hw)
+{
+ struct ixgbe_mbx_info *mbx = &hw->mbx;
+ int countdown = mbx->timeout;
+
+ while (countdown && mbx->ops.check_for_ack(hw)) {
+ countdown--;
+ udelay(mbx->udelay);
+ }
+
+ /* if we failed, all future posted messages fail until reset */
+ if (!countdown)
+ mbx->timeout = 0;
+
+ return countdown ? 0 : IXGBE_ERR_MBX;
+}
+
+/**
+ * ixgbevf_read_posted_mbx - Wait for message notification and receive message
+ * @hw: pointer to the HW structure
+ * @msg: The message buffer
+ * @size: Length of buffer
+ *
+ * returns 0 if it successfully received a message notification and
+ * copied it into the receive buffer.
+ **/
+static s32 ixgbevf_read_posted_mbx(struct ixgbe_hw *hw, u32 *msg, u16 size)
+{
+ struct ixgbe_mbx_info *mbx = &hw->mbx;
+ s32 ret_val = -IXGBE_ERR_MBX;
+
+ if (!mbx->ops.read)
+ goto out;
+
+ 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);
+out:
+ return ret_val;
+}
+
+/**
+ * ixgbevf_write_posted_mbx - Write a message to the mailbox, 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 delay * timeout period
+ **/
+static s32 ixgbevf_write_posted_mbx(struct ixgbe_hw *hw, u32 *msg, u16 size)
+{
+ struct ixgbe_mbx_info *mbx = &hw->mbx;
+ s32 ret_val = -IXGBE_ERR_MBX;
+
+ /* exit if either we can't write or there isn't a defined timeout */
+ if (!mbx->ops.write || !mbx->timeout)
+ goto out;
+
+ /* send msg */
+ ret_val = mbx->ops.write(hw, msg, size);
+
+ /* if msg sent wait until we receive an ack */
+ if (!ret_val)
+ ret_val = ixgbevf_poll_for_ack(hw);
+out:
+ return ret_val;
+}
+
+/**
+ * ixgbevf_read_v2p_mailbox - read v2p mailbox
+ * @hw: pointer to the HW structure
+ *
+ * This function is used to read the v2p mailbox without losing the read to
+ * clear status bits.
+ **/
+static u32 ixgbevf_read_v2p_mailbox(struct ixgbe_hw *hw)
+{
+ u32 v2p_mailbox = IXGBE_READ_REG(hw, IXGBE_VFMAILBOX);
+
+ v2p_mailbox |= hw->mbx.v2p_mailbox;
+ hw->mbx.v2p_mailbox |= v2p_mailbox & IXGBE_VFMAILBOX_R2C_BITS;
+
+ return v2p_mailbox;
+}
+
+/**
+ * ixgbevf_check_for_bit_vf - Determine if a status bit was set
+ * @hw: pointer to the HW structure
+ * @mask: bitmask for bits to be tested and cleared
+ *
+ * This function is used to check for the read to clear bits within
+ * the V2P mailbox.
+ **/
+static s32 ixgbevf_check_for_bit_vf(struct ixgbe_hw *hw, u32 mask)
+{
+ u32 v2p_mailbox = ixgbevf_read_v2p_mailbox(hw);
+ s32 ret_val = IXGBE_ERR_MBX;
+
+ if (v2p_mailbox & mask)
+ ret_val = 0;
+
+ hw->mbx.v2p_mailbox &= ~mask;
+
+ return ret_val;
+}
+
+/**
+ * ixgbevf_check_for_msg_vf - checks to see if the PF has sent mail
+ * @hw: pointer to the HW structure
+ *
+ * returns 0 if the PF has set the Status bit or else ERR_MBX
+ **/
+static s32 ixgbevf_check_for_msg_vf(struct ixgbe_hw *hw)
+{
+ s32 ret_val = IXGBE_ERR_MBX;
+
+ if (!ixgbevf_check_for_bit_vf(hw, IXGBE_VFMAILBOX_PFSTS)) {
+ ret_val = 0;
+ hw->mbx.stats.reqs++;
+ }
+
+ return ret_val;
+}
+
+/**
+ * ixgbevf_check_for_ack_vf - checks to see if the PF has ACK'd
+ * @hw: pointer to the HW structure
+ *
+ * returns 0 if the PF has set the ACK bit or else ERR_MBX
+ **/
+static s32 ixgbevf_check_for_ack_vf(struct ixgbe_hw *hw)
+{
+ s32 ret_val = IXGBE_ERR_MBX;
+
+ if (!ixgbevf_check_for_bit_vf(hw, IXGBE_VFMAILBOX_PFACK)) {
+ ret_val = 0;
+ hw->mbx.stats.acks++;
+ }
+
+ return ret_val;
+}
+
+/**
+ * ixgbevf_check_for_rst_vf - checks to see if the PF has reset
+ * @hw: pointer to the HW structure
+ *
+ * returns true if the PF has set the reset done bit or else false
+ **/
+static s32 ixgbevf_check_for_rst_vf(struct ixgbe_hw *hw)
+{
+ s32 ret_val = IXGBE_ERR_MBX;
+
+ if (!ixgbevf_check_for_bit_vf(hw, (IXGBE_VFMAILBOX_RSTD |
+ IXGBE_VFMAILBOX_RSTI))) {
+ ret_val = 0;
+ hw->mbx.stats.rsts++;
+ }
+
+ return ret_val;
+}
+
+/**
+ * ixgbevf_obtain_mbx_lock_vf - obtain mailbox lock
+ * @hw: pointer to the HW structure
+ *
+ * return 0 if we obtained the mailbox lock
+ **/
+static s32 ixgbevf_obtain_mbx_lock_vf(struct ixgbe_hw *hw)
+{
+ s32 ret_val = IXGBE_ERR_MBX;
+
+ /* Take ownership of the buffer */
+ IXGBE_WRITE_REG(hw, IXGBE_VFMAILBOX, IXGBE_VFMAILBOX_VFU);
+
+ /* reserve mailbox for VF use */
+ if (ixgbevf_read_v2p_mailbox(hw) & IXGBE_VFMAILBOX_VFU)
+ ret_val = 0;
+
+ return ret_val;
+}
+
+/**
+ * ixgbevf_write_mbx_vf - Write a message to the mailbox
+ * @hw: pointer to the HW structure
+ * @msg: The message buffer
+ * @size: Length of buffer
+ *
+ * returns 0 if it successfully copied message into the buffer
+ **/
+static s32 ixgbevf_write_mbx_vf(struct ixgbe_hw *hw, u32 *msg, u16 size)
+{
+ s32 ret_val;
+ 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_write;
+
+ /* flush msg and acks as we are overwriting the message buffer */
+ ixgbevf_check_for_msg_vf(hw);
+ ixgbevf_check_for_ack_vf(hw);
+
+ /* copy the caller specified message to the mailbox memory buffer */
+ for (i = 0; i < size; i++)
+ IXGBE_WRITE_REG_ARRAY(hw, IXGBE_VFMBMEM, i, msg[i]);
+
+ /* update stats */
+ hw->mbx.stats.msgs_tx++;
+
+ /* Drop VFU and interrupt the PF to tell it a message has been sent */
+ IXGBE_WRITE_REG(hw, IXGBE_VFMAILBOX, IXGBE_VFMAILBOX_REQ);
+
+out_no_write:
+ return ret_val;
+}
+
+/**
+ * ixgbevf_read_mbx_vf - 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(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 = 0;
+ 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;
+}
+
+const struct ixgbe_mbx_operations ixgbevf_mbx_ops = {
+ .init_params = ixgbevf_init_mbx_params_vf,
+ .read = ixgbevf_read_mbx_vf,
+ .write = ixgbevf_write_mbx_vf,
+ .read_posted = ixgbevf_read_posted_mbx,
+ .write_posted = ixgbevf_write_posted_mbx,
+ .check_for_msg = ixgbevf_check_for_msg_vf,
+ .check_for_ack = ixgbevf_check_for_ack_vf,
+ .check_for_rst = ixgbevf_check_for_rst_vf,
+};
+
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