New upstream version 18.08upstream/18.08

Change-Id: I32fdf5e5016556d9c0a6d88ddaf1fc468961790a
Signed-off-by: Luca Boccassi <luca.boccassi@gmail.com>

1 files changed, 510 insertions, 0 deletions

diff --git a/kernel/linux/kni/ethtool/igb/e1000_mbx.c b/kernel/linux/kni/ethtool/igb/e1000_mbx.c
new file mode 100644
index 00000000..1be44349
--- /dev/null
+++ b/kernel/linux/kni/ethtool/igb/e1000_mbx.c
@@ -0,0 +1,510 @@
+// SPDX-License-Identifier: GPL-2.0
+/*******************************************************************************
+
+  Intel(R) Gigabit Ethernet Linux driver
+  Copyright(c) 2007-2013 Intel Corporation.
+
+  Contact Information:
+  e1000-devel Mailing List <e1000-devel@lists.sourceforge.net>
+  Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
+
+*******************************************************************************/
+
+#include "e1000_mbx.h"
+
+/**
+ *  e1000_null_mbx_check_for_flag - No-op function, return 0
+ *  @hw: pointer to the HW structure
+ **/
+static s32 e1000_null_mbx_check_for_flag(struct e1000_hw E1000_UNUSEDARG *hw,
+					 u16 E1000_UNUSEDARG mbx_id)
+{
+	DEBUGFUNC("e1000_null_mbx_check_flag");
+
+	return E1000_SUCCESS;
+}
+
+/**
+ *  e1000_null_mbx_transact - No-op function, return 0
+ *  @hw: pointer to the HW structure
+ **/
+static s32 e1000_null_mbx_transact(struct e1000_hw E1000_UNUSEDARG *hw,
+				   u32 E1000_UNUSEDARG *msg,
+				   u16 E1000_UNUSEDARG size,
+				   u16 E1000_UNUSEDARG mbx_id)
+{
+	DEBUGFUNC("e1000_null_mbx_rw_msg");
+
+	return E1000_SUCCESS;
+}
+
+/**
+ *  e1000_read_mbx - Reads a message from the mailbox
+ *  @hw: pointer to the HW structure
+ *  @msg: The message buffer
+ *  @size: Length of buffer
+ *  @mbx_id: id of mailbox to read
+ *
+ *  returns SUCCESS if it successfully read message from buffer
+ **/
+s32 e1000_read_mbx(struct e1000_hw *hw, u32 *msg, u16 size, u16 mbx_id)
+{
+	struct e1000_mbx_info *mbx = &hw->mbx;
+	s32 ret_val = -E1000_ERR_MBX;
+
+	DEBUGFUNC("e1000_read_mbx");
+
+	/* limit read to size of mailbox */
+	if (size > mbx->size)
+		size = mbx->size;
+
+	if (mbx->ops.read)
+		ret_val = mbx->ops.read(hw, msg, size, mbx_id);
+
+	return ret_val;
+}
+
+/**
+ *  e1000_write_mbx - Write a message to the mailbox
+ *  @hw: pointer to the HW structure
+ *  @msg: The message buffer
+ *  @size: Length of buffer
+ *  @mbx_id: id of mailbox to write
+ *
+ *  returns SUCCESS if it successfully copied message into the buffer
+ **/
+s32 e1000_write_mbx(struct e1000_hw *hw, u32 *msg, u16 size, u16 mbx_id)
+{
+	struct e1000_mbx_info *mbx = &hw->mbx;
+	s32 ret_val = E1000_SUCCESS;
+
+	DEBUGFUNC("e1000_write_mbx");
+
+	if (size > mbx->size)
+		ret_val = -E1000_ERR_MBX;
+
+	else if (mbx->ops.write)
+		ret_val = mbx->ops.write(hw, msg, size, mbx_id);
+
+	return ret_val;
+}
+
+/**
+ *  e1000_check_for_msg - checks to see if someone sent us mail
+ *  @hw: pointer to the HW structure
+ *  @mbx_id: id of mailbox to check
+ *
+ *  returns SUCCESS if the Status bit was found or else ERR_MBX
+ **/
+s32 e1000_check_for_msg(struct e1000_hw *hw, u16 mbx_id)
+{
+	struct e1000_mbx_info *mbx = &hw->mbx;
+	s32 ret_val = -E1000_ERR_MBX;
+
+	DEBUGFUNC("e1000_check_for_msg");
+
+	if (mbx->ops.check_for_msg)
+		ret_val = mbx->ops.check_for_msg(hw, mbx_id);
+
+	return ret_val;
+}
+
+/**
+ *  e1000_check_for_ack - checks to see if someone sent us ACK
+ *  @hw: pointer to the HW structure
+ *  @mbx_id: id of mailbox to check
+ *
+ *  returns SUCCESS if the Status bit was found or else ERR_MBX
+ **/
+s32 e1000_check_for_ack(struct e1000_hw *hw, u16 mbx_id)
+{
+	struct e1000_mbx_info *mbx = &hw->mbx;
+	s32 ret_val = -E1000_ERR_MBX;
+
+	DEBUGFUNC("e1000_check_for_ack");
+
+	if (mbx->ops.check_for_ack)
+		ret_val = mbx->ops.check_for_ack(hw, mbx_id);
+
+	return ret_val;
+}
+
+/**
+ *  e1000_check_for_rst - checks to see if other side has reset
+ *  @hw: pointer to the HW structure
+ *  @mbx_id: id of mailbox to check
+ *
+ *  returns SUCCESS if the Status bit was found or else ERR_MBX
+ **/
+s32 e1000_check_for_rst(struct e1000_hw *hw, u16 mbx_id)
+{
+	struct e1000_mbx_info *mbx = &hw->mbx;
+	s32 ret_val = -E1000_ERR_MBX;
+
+	DEBUGFUNC("e1000_check_for_rst");
+
+	if (mbx->ops.check_for_rst)
+		ret_val = mbx->ops.check_for_rst(hw, mbx_id);
+
+	return ret_val;
+}
+
+/**
+ *  e1000_poll_for_msg - Wait for message notification
+ *  @hw: pointer to the HW structure
+ *  @mbx_id: id of mailbox to write
+ *
+ *  returns SUCCESS if it successfully received a message notification
+ **/
+static s32 e1000_poll_for_msg(struct e1000_hw *hw, u16 mbx_id)
+{
+	struct e1000_mbx_info *mbx = &hw->mbx;
+	int countdown = mbx->timeout;
+
+	DEBUGFUNC("e1000_poll_for_msg");
+
+	if (!countdown || !mbx->ops.check_for_msg)
+		goto out;
+
+	while (countdown && mbx->ops.check_for_msg(hw, mbx_id)) {
+		countdown--;
+		if (!countdown)
+			break;
+		usec_delay(mbx->usec_delay);
+	}
+
+	/* if we failed, all future posted messages fail until reset */
+	if (!countdown)
+		mbx->timeout = 0;
+out:
+	return countdown ? E1000_SUCCESS : -E1000_ERR_MBX;
+}
+
+/**
+ *  e1000_poll_for_ack - Wait for message acknowledgement
+ *  @hw: pointer to the HW structure
+ *  @mbx_id: id of mailbox to write
+ *
+ *  returns SUCCESS if it successfully received a message acknowledgement
+ **/
+static s32 e1000_poll_for_ack(struct e1000_hw *hw, u16 mbx_id)
+{
+	struct e1000_mbx_info *mbx = &hw->mbx;
+	int countdown = mbx->timeout;
+
+	DEBUGFUNC("e1000_poll_for_ack");
+
+	if (!countdown || !mbx->ops.check_for_ack)
+		goto out;
+
+	while (countdown && mbx->ops.check_for_ack(hw, mbx_id)) {
+		countdown--;
+		if (!countdown)
+			break;
+		usec_delay(mbx->usec_delay);
+	}
+
+	/* if we failed, all future posted messages fail until reset */
+	if (!countdown)
+		mbx->timeout = 0;
+out:
+	return countdown ? E1000_SUCCESS : -E1000_ERR_MBX;
+}
+
+/**
+ *  e1000_read_posted_mbx - Wait for message notification and receive message
+ *  @hw: pointer to the HW structure
+ *  @msg: The message buffer
+ *  @size: Length of buffer
+ *  @mbx_id: id of mailbox to write
+ *
+ *  returns SUCCESS if it successfully received a message notification and
+ *  copied it into the receive buffer.
+ **/
+s32 e1000_read_posted_mbx(struct e1000_hw *hw, u32 *msg, u16 size, u16 mbx_id)
+{
+	struct e1000_mbx_info *mbx = &hw->mbx;
+	s32 ret_val = -E1000_ERR_MBX;
+
+	DEBUGFUNC("e1000_read_posted_mbx");
+
+	if (!mbx->ops.read)
+		goto out;
+
+	ret_val = e1000_poll_for_msg(hw, mbx_id);
+
+	/* if ack received read message, otherwise we timed out */
+	if (!ret_val)
+		ret_val = mbx->ops.read(hw, msg, size, mbx_id);
+out:
+	return ret_val;
+}
+
+/**
+ *  e1000_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
+ *  @mbx_id: id of mailbox to write
+ *
+ *  returns SUCCESS if it successfully copied message into the buffer and
+ *  received an ack to that message within delay * timeout period
+ **/
+s32 e1000_write_posted_mbx(struct e1000_hw *hw, u32 *msg, u16 size, u16 mbx_id)
+{
+	struct e1000_mbx_info *mbx = &hw->mbx;
+	s32 ret_val = -E1000_ERR_MBX;
+
+	DEBUGFUNC("e1000_write_posted_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, mbx_id);
+
+	/* if msg sent wait until we receive an ack */
+	if (!ret_val)
+		ret_val = e1000_poll_for_ack(hw, mbx_id);
+out:
+	return ret_val;
+}
+
+/**
+ *  e1000_init_mbx_ops_generic - Initialize mbx function pointers
+ *  @hw: pointer to the HW structure
+ *
+ *  Sets the function pointers to no-op functions
+ **/
+void e1000_init_mbx_ops_generic(struct e1000_hw *hw)
+{
+	struct e1000_mbx_info *mbx = &hw->mbx;
+	mbx->ops.init_params = e1000_null_ops_generic;
+	mbx->ops.read = e1000_null_mbx_transact;
+	mbx->ops.write = e1000_null_mbx_transact;
+	mbx->ops.check_for_msg = e1000_null_mbx_check_for_flag;
+	mbx->ops.check_for_ack = e1000_null_mbx_check_for_flag;
+	mbx->ops.check_for_rst = e1000_null_mbx_check_for_flag;
+	mbx->ops.read_posted = e1000_read_posted_mbx;
+	mbx->ops.write_posted = e1000_write_posted_mbx;
+}
+
+static s32 e1000_check_for_bit_pf(struct e1000_hw *hw, u32 mask)
+{
+	u32 mbvficr = E1000_READ_REG(hw, E1000_MBVFICR);
+	s32 ret_val = -E1000_ERR_MBX;
+
+	if (mbvficr & mask) {
+		ret_val = E1000_SUCCESS;
+		E1000_WRITE_REG(hw, E1000_MBVFICR, mask);
+	}
+
+	return ret_val;
+}
+
+/**
+ *  e1000_check_for_msg_pf - checks to see if the VF has sent mail
+ *  @hw: pointer to the HW structure
+ *  @vf_number: the VF index
+ *
+ *  returns SUCCESS if the VF has set the Status bit or else ERR_MBX
+ **/
+static s32 e1000_check_for_msg_pf(struct e1000_hw *hw, u16 vf_number)
+{
+	s32 ret_val = -E1000_ERR_MBX;
+
+	DEBUGFUNC("e1000_check_for_msg_pf");
+
+	if (!e1000_check_for_bit_pf(hw, E1000_MBVFICR_VFREQ_VF1 << vf_number)) {
+		ret_val = E1000_SUCCESS;
+		hw->mbx.stats.reqs++;
+	}
+
+	return ret_val;
+}
+
+/**
+ *  e1000_check_for_ack_pf - checks to see if the VF has ACKed
+ *  @hw: pointer to the HW structure
+ *  @vf_number: the VF index
+ *
+ *  returns SUCCESS if the VF has set the Status bit or else ERR_MBX
+ **/
+static s32 e1000_check_for_ack_pf(struct e1000_hw *hw, u16 vf_number)
+{
+	s32 ret_val = -E1000_ERR_MBX;
+
+	DEBUGFUNC("e1000_check_for_ack_pf");
+
+	if (!e1000_check_for_bit_pf(hw, E1000_MBVFICR_VFACK_VF1 << vf_number)) {
+		ret_val = E1000_SUCCESS;
+		hw->mbx.stats.acks++;
+	}
+
+	return ret_val;
+}
+
+/**
+ *  e1000_check_for_rst_pf - checks to see if the VF has reset
+ *  @hw: pointer to the HW structure
+ *  @vf_number: the VF index
+ *
+ *  returns SUCCESS if the VF has set the Status bit or else ERR_MBX
+ **/
+static s32 e1000_check_for_rst_pf(struct e1000_hw *hw, u16 vf_number)
+{
+	u32 vflre = E1000_READ_REG(hw, E1000_VFLRE);
+	s32 ret_val = -E1000_ERR_MBX;
+
+	DEBUGFUNC("e1000_check_for_rst_pf");
+
+	if (vflre & (1 << vf_number)) {
+		ret_val = E1000_SUCCESS;
+		E1000_WRITE_REG(hw, E1000_VFLRE, (1 << vf_number));
+		hw->mbx.stats.rsts++;
+	}
+
+	return ret_val;
+}
+
+/**
+ *  e1000_obtain_mbx_lock_pf - obtain mailbox lock
+ *  @hw: pointer to the HW structure
+ *  @vf_number: the VF index
+ *
+ *  return SUCCESS if we obtained the mailbox lock
+ **/
+static s32 e1000_obtain_mbx_lock_pf(struct e1000_hw *hw, u16 vf_number)
+{
+	s32 ret_val = -E1000_ERR_MBX;
+	u32 p2v_mailbox;
+
+	DEBUGFUNC("e1000_obtain_mbx_lock_pf");
+
+	/* Take ownership of the buffer */
+	E1000_WRITE_REG(hw, E1000_P2VMAILBOX(vf_number), E1000_P2VMAILBOX_PFU);
+
+	/* reserve mailbox for vf use */
+	p2v_mailbox = E1000_READ_REG(hw, E1000_P2VMAILBOX(vf_number));
+	if (p2v_mailbox & E1000_P2VMAILBOX_PFU)
+		ret_val = E1000_SUCCESS;
+
+	return ret_val;
+}
+
+/**
+ *  e1000_write_mbx_pf - Places a message in the mailbox
+ *  @hw: pointer to the HW structure
+ *  @msg: The message buffer
+ *  @size: Length of buffer
+ *  @vf_number: the VF index
+ *
+ *  returns SUCCESS if it successfully copied message into the buffer
+ **/
+static s32 e1000_write_mbx_pf(struct e1000_hw *hw, u32 *msg, u16 size,
+			      u16 vf_number)
+{
+	s32 ret_val;
+	u16 i;
+
+	DEBUGFUNC("e1000_write_mbx_pf");
+
+	/* lock the mailbox to prevent pf/vf race condition */
+	ret_val = e1000_obtain_mbx_lock_pf(hw, vf_number);
+	if (ret_val)
+		goto out_no_write;
+
+	/* flush msg and acks as we are overwriting the message buffer */
+	e1000_check_for_msg_pf(hw, vf_number);
+	e1000_check_for_ack_pf(hw, vf_number);
+
+	/* copy the caller specified message to the mailbox memory buffer */
+	for (i = 0; i < size; i++)
+		E1000_WRITE_REG_ARRAY(hw, E1000_VMBMEM(vf_number), i, msg[i]);
+
+	/* Interrupt VF to tell it a message has been sent and release buffer*/
+	E1000_WRITE_REG(hw, E1000_P2VMAILBOX(vf_number), E1000_P2VMAILBOX_STS);
+
+	/* update stats */
+	hw->mbx.stats.msgs_tx++;
+
+out_no_write:
+	return ret_val;
+
+}
+
+/**
+ *  e1000_read_mbx_pf - Read a message from the mailbox
+ *  @hw: pointer to the HW structure
+ *  @msg: The message buffer
+ *  @size: Length of buffer
+ *  @vf_number: the VF index
+ *
+ *  This function copies a message from the mailbox buffer to the caller's
+ *  memory buffer.  The presumption is that the caller knows that there was
+ *  a message due to a VF request so no polling for message is needed.
+ **/
+static s32 e1000_read_mbx_pf(struct e1000_hw *hw, u32 *msg, u16 size,
+			     u16 vf_number)
+{
+	s32 ret_val;
+	u16 i;
+
+	DEBUGFUNC("e1000_read_mbx_pf");
+
+	/* lock the mailbox to prevent pf/vf race condition */
+	ret_val = e1000_obtain_mbx_lock_pf(hw, vf_number);
+	if (ret_val)
+		goto out_no_read;
+
+	/* copy the message to the mailbox memory buffer */
+	for (i = 0; i < size; i++)
+		msg[i] = E1000_READ_REG_ARRAY(hw, E1000_VMBMEM(vf_number), i);
+
+	/* Acknowledge the message and release buffer */
+	E1000_WRITE_REG(hw, E1000_P2VMAILBOX(vf_number), E1000_P2VMAILBOX_ACK);
+
+	/* update stats */
+	hw->mbx.stats.msgs_rx++;
+
+out_no_read:
+	return ret_val;
+}
+
+/**
+ *  e1000_init_mbx_params_pf - set initial values for pf mailbox
+ *  @hw: pointer to the HW structure
+ *
+ *  Initializes the hw->mbx struct to correct values for pf mailbox
+ */
+s32 e1000_init_mbx_params_pf(struct e1000_hw *hw)
+{
+	struct e1000_mbx_info *mbx = &hw->mbx;
+
+	switch (hw->mac.type) {
+	case e1000_82576:
+	case e1000_i350:
+	case e1000_i354:
+		mbx->timeout = 0;
+		mbx->usec_delay = 0;
+
+		mbx->size = E1000_VFMAILBOX_SIZE;
+
+		mbx->ops.read = e1000_read_mbx_pf;
+		mbx->ops.write = e1000_write_mbx_pf;
+		mbx->ops.read_posted = e1000_read_posted_mbx;
+		mbx->ops.write_posted = e1000_write_posted_mbx;
+		mbx->ops.check_for_msg = e1000_check_for_msg_pf;
+		mbx->ops.check_for_ack = e1000_check_for_ack_pf;
+		mbx->ops.check_for_rst = e1000_check_for_rst_pf;
+
+		mbx->stats.msgs_tx = 0;
+		mbx->stats.msgs_rx = 0;
+		mbx->stats.reqs = 0;
+		mbx->stats.acks = 0;
+		mbx->stats.rsts = 0;
+	default:
+		return E1000_SUCCESS;
+	}
+}