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Commit b651957c authored by Alexander Duyck's avatar Alexander Duyck Committed by Jeff Kirsher
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fm10k: Add support for PF <-> VF mailbox 



This patch adds support for the PF <-> VF mailbox.  It functions similar to
the PF <-> SM mailbox however there are several modifications made to
improve the reliability of the mailbox itself.  In addition the PF/VF
mailbox is much smaller an only supports a total size of 16 DWORDs vs the
1024 DWORDS provided for the PF/SM mailbox.

Signed-off-by: default avatarAlexander Duyck <alexander.h.duyck@intel.com>
Signed-off-by: default avatarJeff Kirsher <jeffrey.t.kirsher@intel.com>
parent 5cd5e2e9

drivers/net/ethernet/intel/fm10k/fm10k_mbx.c

+770 −0
Original line number Original line Diff line number Diff line
@@ -511,6 +511,148 @@ static s32 fm10k_mbx_push_tail(struct fm10k_hw *hw, 
	return 0;

	return 0;

}

}





/* pre-generated data for generating the CRC based on the poly 0xAC9A. */

static const u16 fm10k_crc_16b_table[256] = {

	0x0000, 0x7956, 0xF2AC, 0x8BFA, 0xBC6D, 0xC53B, 0x4EC1, 0x3797,

	0x21EF, 0x58B9, 0xD343, 0xAA15, 0x9D82, 0xE4D4, 0x6F2E, 0x1678,

	0x43DE, 0x3A88, 0xB172, 0xC824, 0xFFB3, 0x86E5, 0x0D1F, 0x7449,

	0x6231, 0x1B67, 0x909D, 0xE9CB, 0xDE5C, 0xA70A, 0x2CF0, 0x55A6,

	0x87BC, 0xFEEA, 0x7510, 0x0C46, 0x3BD1, 0x4287, 0xC97D, 0xB02B,

	0xA653, 0xDF05, 0x54FF, 0x2DA9, 0x1A3E, 0x6368, 0xE892, 0x91C4,

	0xC462, 0xBD34, 0x36CE, 0x4F98, 0x780F, 0x0159, 0x8AA3, 0xF3F5,

	0xE58D, 0x9CDB, 0x1721, 0x6E77, 0x59E0, 0x20B6, 0xAB4C, 0xD21A,

	0x564D, 0x2F1B, 0xA4E1, 0xDDB7, 0xEA20, 0x9376, 0x188C, 0x61DA,

	0x77A2, 0x0EF4, 0x850E, 0xFC58, 0xCBCF, 0xB299, 0x3963, 0x4035,

	0x1593, 0x6CC5, 0xE73F, 0x9E69, 0xA9FE, 0xD0A8, 0x5B52, 0x2204,

	0x347C, 0x4D2A, 0xC6D0, 0xBF86, 0x8811, 0xF147, 0x7ABD, 0x03EB,

	0xD1F1, 0xA8A7, 0x235D, 0x5A0B, 0x6D9C, 0x14CA, 0x9F30, 0xE666,

	0xF01E, 0x8948, 0x02B2, 0x7BE4, 0x4C73, 0x3525, 0xBEDF, 0xC789,

	0x922F, 0xEB79, 0x6083, 0x19D5, 0x2E42, 0x5714, 0xDCEE, 0xA5B8,

	0xB3C0, 0xCA96, 0x416C, 0x383A, 0x0FAD, 0x76FB, 0xFD01, 0x8457,

	0xAC9A, 0xD5CC, 0x5E36, 0x2760, 0x10F7, 0x69A1, 0xE25B, 0x9B0D,

	0x8D75, 0xF423, 0x7FD9, 0x068F, 0x3118, 0x484E, 0xC3B4, 0xBAE2,

	0xEF44, 0x9612, 0x1DE8, 0x64BE, 0x5329, 0x2A7F, 0xA185, 0xD8D3,

	0xCEAB, 0xB7FD, 0x3C07, 0x4551, 0x72C6, 0x0B90, 0x806A, 0xF93C,

	0x2B26, 0x5270, 0xD98A, 0xA0DC, 0x974B, 0xEE1D, 0x65E7, 0x1CB1,

	0x0AC9, 0x739F, 0xF865, 0x8133, 0xB6A4, 0xCFF2, 0x4408, 0x3D5E,

	0x68F8, 0x11AE, 0x9A54, 0xE302, 0xD495, 0xADC3, 0x2639, 0x5F6F,

	0x4917, 0x3041, 0xBBBB, 0xC2ED, 0xF57A, 0x8C2C, 0x07D6, 0x7E80,

	0xFAD7, 0x8381, 0x087B, 0x712D, 0x46BA, 0x3FEC, 0xB416, 0xCD40,

	0xDB38, 0xA26E, 0x2994, 0x50C2, 0x6755, 0x1E03, 0x95F9, 0xECAF,

	0xB909, 0xC05F, 0x4BA5, 0x32F3, 0x0564, 0x7C32, 0xF7C8, 0x8E9E,

	0x98E6, 0xE1B0, 0x6A4A, 0x131C, 0x248B, 0x5DDD, 0xD627, 0xAF71,

	0x7D6B, 0x043D, 0x8FC7, 0xF691, 0xC106, 0xB850, 0x33AA, 0x4AFC,

	0x5C84, 0x25D2, 0xAE28, 0xD77E, 0xE0E9, 0x99BF, 0x1245, 0x6B13,

	0x3EB5, 0x47E3, 0xCC19, 0xB54F, 0x82D8, 0xFB8E, 0x7074, 0x0922,

	0x1F5A, 0x660C, 0xEDF6, 0x94A0, 0xA337, 0xDA61, 0x519B, 0x28CD };



/**

 *  fm10k_crc_16b - Generate a 16 bit CRC for a region of 16 bit data

 *  @data: pointer to data to process

 *  @seed: seed value for CRC

 *  @len: length measured in 16 bits words

 *

 *  This function will generate a CRC based on the polynomial 0xAC9A and

 *  whatever value is stored in the seed variable.  Note that this

 *  value inverts the local seed and the result in order to capture all

 *  leading and trailing zeros.

 */

static u16 fm10k_crc_16b(const u32 *data, u16 seed, u16 len)

{

	u32 result = seed;



	while (len--) {

		result ^= *(data++);

		result = (result >> 8) ^ fm10k_crc_16b_table[result & 0xFF];

		result = (result >> 8) ^ fm10k_crc_16b_table[result & 0xFF];



		if (!(len--))

			break;



		result = (result >> 8) ^ fm10k_crc_16b_table[result & 0xFF];

		result = (result >> 8) ^ fm10k_crc_16b_table[result & 0xFF];

	}



	return (u16)result;

}



/**

 *  fm10k_fifo_crc - generate a CRC based off of FIFO data

 *  @fifo: pointer to FIFO

 *  @offset: offset point for start of FIFO

 *  @len: number of DWORDS words to process

 *  @seed: seed value for CRC

 *

 *  This function generates a CRC for some region of the FIFO

 **/

static u16 fm10k_fifo_crc(struct fm10k_mbx_fifo *fifo, u16 offset,

			  u16 len, u16 seed)

{

	u32 *data = fifo->buffer + offset;



	/* track when we should cross the end of the FIFO */

	offset = fifo->size - offset;



	/* if we are in 2 blocks process the end of the FIFO first */

	if (offset < len) {

		seed = fm10k_crc_16b(data, seed, offset * 2);

		data = fifo->buffer;

		len -= offset;

	}



	/* process any remaining bits */

	return fm10k_crc_16b(data, seed, len * 2);

}



/**

 *  fm10k_mbx_update_local_crc - Update the local CRC for outgoing data

 *  @mbx: pointer to mailbox

 *  @head: head index provided by remote mailbox

 *

 *  This function will generate the CRC for all data from the end of the

 *  last head update to the current one.  It uses the result of the

 *  previous CRC as the seed for this update.  The result is stored in

 *  mbx->local.

 **/

static void fm10k_mbx_update_local_crc(struct fm10k_mbx_info *mbx, u16 head)

{

	u16 len = mbx->tail_len - fm10k_mbx_index_len(mbx, head, mbx->tail);



	/* determine the offset for the start of the region to be pulled */

	head = fm10k_fifo_head_offset(&mbx->tx, mbx->pulled);



	/* update local CRC to include all of the pulled data */

	mbx->local = fm10k_fifo_crc(&mbx->tx, head, len, mbx->local);

}



/**

 *  fm10k_mbx_verify_remote_crc - Verify the CRC is correct for current data

 *  @mbx: pointer to mailbox

 *

 *  This function will take all data that has been provided from the remote

 *  end and generate a CRC for it.  This is stored in mbx->remote.  The

 *  CRC for the header is then computed and if the result is non-zero this

 *  is an error and we signal an error dropping all data and resetting the

 *  connection.

 */

static s32 fm10k_mbx_verify_remote_crc(struct fm10k_mbx_info *mbx)

{

	struct fm10k_mbx_fifo *fifo = &mbx->rx;

	u16 len = mbx->head_len;

	u16 offset = fm10k_fifo_tail_offset(fifo, mbx->pushed) - len;

	u16 crc;



	/* update the remote CRC if new data has been received */

	if (len)

		mbx->remote = fm10k_fifo_crc(fifo, offset, len, mbx->remote);



	/* process the full header as we have to validate the CRC */

	crc = fm10k_crc_16b(&mbx->mbx_hdr, mbx->remote, 1);



	/* notify other end if we have a problem */

	return crc ? FM10K_MBX_ERR_CRC : 0;

}



/**

/**

 *  fm10k_mbx_rx_ready - Indicates that a message is ready in the Rx FIFO

 *  fm10k_mbx_rx_ready - Indicates that a message is ready in the Rx FIFO

 *  @mbx: pointer to mailbox

 *  @mbx: pointer to mailbox
@@ -685,6 +827,204 @@ static void fm10k_mbx_write(struct fm10k_hw *hw, struct fm10k_mbx_info *mbx) 
	mbx->mbx_lock = 0;

	mbx->mbx_lock = 0;

}

}





/**

 *  fm10k_mbx_create_connect_hdr - Generate a connect mailbox header

 *  @mbx: pointer to mailbox

 *

 *  This function returns a connection mailbox header

 **/

static void fm10k_mbx_create_connect_hdr(struct fm10k_mbx_info *mbx)

{

	mbx->mbx_lock |= FM10K_MBX_REQ;



	mbx->mbx_hdr = FM10K_MSG_HDR_FIELD_SET(FM10K_MSG_CONNECT, TYPE) |

		       FM10K_MSG_HDR_FIELD_SET(mbx->head, HEAD) |

		       FM10K_MSG_HDR_FIELD_SET(mbx->rx.size - 1, CONNECT_SIZE);

}



/**

 *  fm10k_mbx_create_data_hdr - Generate a data mailbox header

 *  @mbx: pointer to mailbox

 *

 *  This function returns a data mailbox header

 **/

static void fm10k_mbx_create_data_hdr(struct fm10k_mbx_info *mbx)

{

	u32 hdr = FM10K_MSG_HDR_FIELD_SET(FM10K_MSG_DATA, TYPE) |

		  FM10K_MSG_HDR_FIELD_SET(mbx->tail, TAIL) |

		  FM10K_MSG_HDR_FIELD_SET(mbx->head, HEAD);

	struct fm10k_mbx_fifo *fifo = &mbx->tx;

	u16 crc;



	if (mbx->tail_len)

		mbx->mbx_lock |= FM10K_MBX_REQ;



	/* generate CRC for data in flight and header */

	crc = fm10k_fifo_crc(fifo, fm10k_fifo_head_offset(fifo, mbx->pulled),

			     mbx->tail_len, mbx->local);

	crc = fm10k_crc_16b(&hdr, crc, 1);



	/* load header to memory to be written */

	mbx->mbx_hdr = hdr | FM10K_MSG_HDR_FIELD_SET(crc, CRC);

}



/**

 *  fm10k_mbx_create_disconnect_hdr - Generate a disconnect mailbox header

 *  @mbx: pointer to mailbox

 *

 *  This function returns a disconnect mailbox header

 **/

static void fm10k_mbx_create_disconnect_hdr(struct fm10k_mbx_info *mbx)

{

	u32 hdr = FM10K_MSG_HDR_FIELD_SET(FM10K_MSG_DISCONNECT, TYPE) |

		  FM10K_MSG_HDR_FIELD_SET(mbx->tail, TAIL) |

		  FM10K_MSG_HDR_FIELD_SET(mbx->head, HEAD);

	u16 crc = fm10k_crc_16b(&hdr, mbx->local, 1);



	mbx->mbx_lock |= FM10K_MBX_ACK;



	/* load header to memory to be written */

	mbx->mbx_hdr = hdr | FM10K_MSG_HDR_FIELD_SET(crc, CRC);

}



/**

 *  fm10k_mbx_create_error_msg - Generate a error message

 *  @mbx: pointer to mailbox

 *  @err: local error encountered

 *

 *  This function will interpret the error provided by err, and based on

 *  that it may shift the message by 1 DWORD and then place an error header

 *  at the start of the message.

 **/

static void fm10k_mbx_create_error_msg(struct fm10k_mbx_info *mbx, s32 err)

{

	/* only generate an error message for these types */

	switch (err) {

	case FM10K_MBX_ERR_TAIL:

	case FM10K_MBX_ERR_HEAD:

	case FM10K_MBX_ERR_TYPE:

	case FM10K_MBX_ERR_SIZE:

	case FM10K_MBX_ERR_RSVD0:

	case FM10K_MBX_ERR_CRC:

		break;

	default:

		return;

	}



	mbx->mbx_lock |= FM10K_MBX_REQ;



	mbx->mbx_hdr = FM10K_MSG_HDR_FIELD_SET(FM10K_MSG_ERROR, TYPE) |

		       FM10K_MSG_HDR_FIELD_SET(err, ERR_NO) |

		       FM10K_MSG_HDR_FIELD_SET(mbx->head, HEAD);

}



/**

 *  fm10k_mbx_validate_msg_hdr - Validate common fields in the message header

 *  @mbx: pointer to mailbox

 *  @msg: message array to read

 *

 *  This function will parse up the fields in the mailbox header and return

 *  an error if the header contains any of a number of invalid configurations

 *  including unrecognized type, invalid route, or a malformed message.

 **/

static s32 fm10k_mbx_validate_msg_hdr(struct fm10k_mbx_info *mbx)

{

	u16 type, rsvd0, head, tail, size;

	const u32 *hdr = &mbx->mbx_hdr;



	type = FM10K_MSG_HDR_FIELD_GET(*hdr, TYPE);

	rsvd0 = FM10K_MSG_HDR_FIELD_GET(*hdr, RSVD0);

	tail = FM10K_MSG_HDR_FIELD_GET(*hdr, TAIL);

	head = FM10K_MSG_HDR_FIELD_GET(*hdr, HEAD);

	size = FM10K_MSG_HDR_FIELD_GET(*hdr, CONNECT_SIZE);



	if (rsvd0)

		return FM10K_MBX_ERR_RSVD0;



	switch (type) {

	case FM10K_MSG_DISCONNECT:

		/* validate that all data has been received */

		if (tail != mbx->head)

			return FM10K_MBX_ERR_TAIL;



		/* fall through */

	case FM10K_MSG_DATA:

		/* validate that head is moving correctly */

		if (!head || (head == FM10K_MSG_HDR_MASK(HEAD)))

			return FM10K_MBX_ERR_HEAD;

		if (fm10k_mbx_index_len(mbx, head, mbx->tail) > mbx->tail_len)

			return FM10K_MBX_ERR_HEAD;



		/* validate that tail is moving correctly */

		if (!tail || (tail == FM10K_MSG_HDR_MASK(TAIL)))

			return FM10K_MBX_ERR_TAIL;

		if (fm10k_mbx_index_len(mbx, mbx->head, tail) < mbx->mbmem_len)

			break;



		return FM10K_MBX_ERR_TAIL;

	case FM10K_MSG_CONNECT:

		/* validate size is in range and is power of 2 mask */

		if ((size < FM10K_VFMBX_MSG_MTU) || (size & (size + 1)))

			return FM10K_MBX_ERR_SIZE;



		/* fall through */

	case FM10K_MSG_ERROR:

		if (!head || (head == FM10K_MSG_HDR_MASK(HEAD)))

			return FM10K_MBX_ERR_HEAD;

		/* neither create nor error include a tail offset */

		if (tail)

			return FM10K_MBX_ERR_TAIL;



		break;

	default:

		return FM10K_MBX_ERR_TYPE;

	}



	return 0;

}



/**

 *  fm10k_mbx_create_reply - Generate reply based on state and remote head

 *  @mbx: pointer to mailbox

 *  @head: acknowledgement number

 *

 *  This function will generate an outgoing message based on the current

 *  mailbox state and the remote fifo head.  It will return the length

 *  of the outgoing message excluding header on success, and a negative value

 *  on error.

 **/

static s32 fm10k_mbx_create_reply(struct fm10k_hw *hw,

				  struct fm10k_mbx_info *mbx, u16 head)

{

	switch (mbx->state) {

	case FM10K_STATE_OPEN:

	case FM10K_STATE_DISCONNECT:

		/* update our checksum for the outgoing data */

		fm10k_mbx_update_local_crc(mbx, head);



		/* as long as other end recognizes us keep sending data */

		fm10k_mbx_pull_head(hw, mbx, head);



		/* generate new header based on data */

		if (mbx->tail_len || (mbx->state == FM10K_STATE_OPEN))

			fm10k_mbx_create_data_hdr(mbx);

		else

			fm10k_mbx_create_disconnect_hdr(mbx);

		break;

	case FM10K_STATE_CONNECT:

		/* send disconnect even if we aren't connected */

		fm10k_mbx_create_connect_hdr(mbx);

		break;

	case FM10K_STATE_CLOSED:

		/* generate new header based on data */

		fm10k_mbx_create_disconnect_hdr(mbx);

	default:

		break;

	}



	return 0;

}



/**

/**

 *  fm10k_mbx_reset_work- Reset internal pointers for any pending work

 *  fm10k_mbx_reset_work- Reset internal pointers for any pending work

 *  @mbx: pointer to mailbox

 *  @mbx: pointer to mailbox
@@ -730,6 +1070,359 @@ static void fm10k_mbx_update_max_size(struct fm10k_mbx_info *mbx, u16 size) 
	}

	}

}

}





/**

 *  fm10k_mbx_connect_reset - Reset following request for reset

 *  @mbx: pointer to mailbox

 *

 *  This function resets the mailbox to either a disconnected state

 *  or a connect state depending on the current mailbox state

 **/

static void fm10k_mbx_connect_reset(struct fm10k_mbx_info *mbx)

{

	/* just do a quick resysnc to start of frame */

	fm10k_mbx_reset_work(mbx);



	/* reset CRC seeds */

	mbx->local = FM10K_MBX_CRC_SEED;

	mbx->remote = FM10K_MBX_CRC_SEED;



	/* we cannot exit connect until the size is good */

	if (mbx->state == FM10K_STATE_OPEN)

		mbx->state = FM10K_STATE_CONNECT;

	else

		mbx->state = FM10K_STATE_CLOSED;

}



/**

 *  fm10k_mbx_process_connect - Process connect header

 *  @mbx: pointer to mailbox

 *  @msg: message array to process

 *

 *  This function will read an incoming connect header and reply with the

 *  appropriate message.  It will return a value indicating the number of

 *  data DWORDs on success, or will return a negative value on failure.

 **/

static s32 fm10k_mbx_process_connect(struct fm10k_hw *hw,

				     struct fm10k_mbx_info *mbx)

{

	const enum fm10k_mbx_state state = mbx->state;

	const u32 *hdr = &mbx->mbx_hdr;

	u16 size, head;



	/* we will need to pull all of the fields for verification */

	size = FM10K_MSG_HDR_FIELD_GET(*hdr, CONNECT_SIZE);

	head = FM10K_MSG_HDR_FIELD_GET(*hdr, HEAD);



	switch (state) {

	case FM10K_STATE_DISCONNECT:

	case FM10K_STATE_OPEN:

		/* reset any in-progress work */

		fm10k_mbx_connect_reset(mbx);

		break;

	case FM10K_STATE_CONNECT:

		/* we cannot exit connect until the size is good */

		if (size > mbx->rx.size) {

			mbx->max_size = mbx->rx.size - 1;

		} else {

			/* record the remote system requesting connection */

			mbx->state = FM10K_STATE_OPEN;



			fm10k_mbx_update_max_size(mbx, size);

		}

		break;

	default:

		break;

	}



	/* align our tail index to remote head index */

	mbx->tail = head;



	return fm10k_mbx_create_reply(hw, mbx, head);

}



/**

 *  fm10k_mbx_process_data - Process data header

 *  @mbx: pointer to mailbox

 *

 *  This function will read an incoming data header and reply with the

 *  appropriate message.  It will return a value indicating the number of

 *  data DWORDs on success, or will return a negative value on failure.

 **/

static s32 fm10k_mbx_process_data(struct fm10k_hw *hw,

				  struct fm10k_mbx_info *mbx)

{

	const u32 *hdr = &mbx->mbx_hdr;

	u16 head, tail;

	s32 err;



	/* we will need to pull all of the fields for verification */

	head = FM10K_MSG_HDR_FIELD_GET(*hdr, HEAD);

	tail = FM10K_MSG_HDR_FIELD_GET(*hdr, TAIL);



	/* if we are in connect just update our data and go */

	if (mbx->state == FM10K_STATE_CONNECT) {

		mbx->tail = head;

		mbx->state = FM10K_STATE_OPEN;

	}



	/* abort on message size errors */

	err = fm10k_mbx_push_tail(hw, mbx, tail);

	if (err < 0)

		return err;



	/* verify the checksum on the incoming data */

	err = fm10k_mbx_verify_remote_crc(mbx);

	if (err)

		return err;



	/* process messages if we have received any */

	fm10k_mbx_dequeue_rx(hw, mbx);



	return fm10k_mbx_create_reply(hw, mbx, head);

}



/**

 *  fm10k_mbx_process_disconnect - Process disconnect header

 *  @mbx: pointer to mailbox

 *

 *  This function will read an incoming disconnect header and reply with the

 *  appropriate message.  It will return a value indicating the number of

 *  data DWORDs on success, or will return a negative value on failure.

 **/

static s32 fm10k_mbx_process_disconnect(struct fm10k_hw *hw,

					struct fm10k_mbx_info *mbx)

{

	const enum fm10k_mbx_state state = mbx->state;

	const u32 *hdr = &mbx->mbx_hdr;

	u16 head, tail;

	s32 err;



	/* we will need to pull all of the fields for verification */

	head = FM10K_MSG_HDR_FIELD_GET(*hdr, HEAD);

	tail = FM10K_MSG_HDR_FIELD_GET(*hdr, TAIL);



	/* We should not be receiving disconnect if Rx is incomplete */

	if (mbx->pushed)

		return FM10K_MBX_ERR_TAIL;



	/* we have already verified mbx->head == tail so we know this is 0 */

	mbx->head_len = 0;



	/* verify the checksum on the incoming header is correct */

	err = fm10k_mbx_verify_remote_crc(mbx);

	if (err)

		return err;



	switch (state) {

	case FM10K_STATE_DISCONNECT:

	case FM10K_STATE_OPEN:

		/* state doesn't change if we still have work to do */

		if (!fm10k_mbx_tx_complete(mbx))

			break;



		/* verify the head indicates we completed all transmits */

		if (head != mbx->tail)

			return FM10K_MBX_ERR_HEAD;



		/* reset any in-progress work */

		fm10k_mbx_connect_reset(mbx);

		break;

	default:

		break;

	}



	return fm10k_mbx_create_reply(hw, mbx, head);

}



/**

 *  fm10k_mbx_process_error - Process error header

 *  @mbx: pointer to mailbox

 *

 *  This function will read an incoming error header and reply with the

 *  appropriate message.  It will return a value indicating the number of

 *  data DWORDs on success, or will return a negative value on failure.

 **/

static s32 fm10k_mbx_process_error(struct fm10k_hw *hw,

				   struct fm10k_mbx_info *mbx)

{

	const u32 *hdr = &mbx->mbx_hdr;

	s32 err_no;

	u16 head;



	/* we will need to pull all of the fields for verification */

	head = FM10K_MSG_HDR_FIELD_GET(*hdr, HEAD);



	/* we only have lower 10 bits of error number os add upper bits */

	err_no = FM10K_MSG_HDR_FIELD_GET(*hdr, ERR_NO);

	err_no |= ~FM10K_MSG_HDR_MASK(ERR_NO);



	switch (mbx->state) {

	case FM10K_STATE_OPEN:

	case FM10K_STATE_DISCONNECT:

		/* flush any uncompleted work */

		fm10k_mbx_reset_work(mbx);



		/* reset CRC seeds */

		mbx->local = FM10K_MBX_CRC_SEED;

		mbx->remote = FM10K_MBX_CRC_SEED;



		/* reset tail index and size to prepare for reconnect */

		mbx->tail = head;



		/* if open then reset max_size and go back to connect */

		if (mbx->state == FM10K_STATE_OPEN) {

			mbx->state = FM10K_STATE_CONNECT;

			break;

		}



		/* send a connect message to get data flowing again */

		fm10k_mbx_create_connect_hdr(mbx);

		return 0;

	default:

		break;

	}



	return fm10k_mbx_create_reply(hw, mbx, mbx->tail);

}



/**

 *  fm10k_mbx_process - Process mailbox interrupt

 *  @hw: pointer to hardware structure

 *  @mbx: pointer to mailbox

 *

 *  This function will process incoming mailbox events and generate mailbox

 *  replies.  It will return a value indicating the number of DWORDs

 *  transmitted excluding header on success or a negative value on error.

 **/

static s32 fm10k_mbx_process(struct fm10k_hw *hw,

			     struct fm10k_mbx_info *mbx)

{

	s32 err;



	/* we do not read mailbox if closed */

	if (mbx->state == FM10K_STATE_CLOSED)

		return 0;



	/* copy data from mailbox */

	err = fm10k_mbx_read(hw, mbx);

	if (err)

		return err;



	/* validate type, source, and destination */

	err = fm10k_mbx_validate_msg_hdr(mbx);

	if (err < 0)

		goto msg_err;



	switch (FM10K_MSG_HDR_FIELD_GET(mbx->mbx_hdr, TYPE)) {

	case FM10K_MSG_CONNECT:

		err = fm10k_mbx_process_connect(hw, mbx);

		break;

	case FM10K_MSG_DATA:

		err = fm10k_mbx_process_data(hw, mbx);

		break;

	case FM10K_MSG_DISCONNECT:

		err = fm10k_mbx_process_disconnect(hw, mbx);

		break;

	case FM10K_MSG_ERROR:

		err = fm10k_mbx_process_error(hw, mbx);

		break;

	default:

		err = FM10K_MBX_ERR_TYPE;

		break;

	}



msg_err:

	/* notify partner of errors on our end */

	if (err < 0)

		fm10k_mbx_create_error_msg(mbx, err);



	/* copy data from mailbox */

	fm10k_mbx_write(hw, mbx);



	return err;

}



/**

 *  fm10k_mbx_disconnect - Shutdown mailbox connection

 *  @hw: pointer to hardware structure

 *  @mbx: pointer to mailbox

 *

 *  This function will shut down the mailbox.  It places the mailbox first

 *  in the disconnect state, it then allows up to a predefined timeout for

 *  the mailbox to transition to close on its own.  If this does not occur

 *  then the mailbox will be forced into the closed state.

 *

 *  Any mailbox transactions not completed before calling this function

 *  are not guaranteed to complete and may be dropped.

 **/

static void fm10k_mbx_disconnect(struct fm10k_hw *hw,

				 struct fm10k_mbx_info *mbx)

{

	int timeout = mbx->timeout ? FM10K_MBX_DISCONNECT_TIMEOUT : 0;



	/* Place mbx in ready to disconnect state */

	mbx->state = FM10K_STATE_DISCONNECT;



	/* trigger interrupt to start shutdown process */

	fm10k_write_reg(hw, mbx->mbx_reg, FM10K_MBX_REQ |

					  FM10K_MBX_INTERRUPT_DISABLE);

	do {

		udelay(FM10K_MBX_POLL_DELAY);

		mbx->ops.process(hw, mbx);

		timeout -= FM10K_MBX_POLL_DELAY;

	} while ((timeout > 0) && (mbx->state != FM10K_STATE_CLOSED));



	/* in case we didn't close just force the mailbox into shutdown */

	fm10k_mbx_connect_reset(mbx);

	fm10k_mbx_update_max_size(mbx, 0);



	fm10k_write_reg(hw, mbx->mbmem_reg, 0);

}



/**

 *  fm10k_mbx_connect - Start mailbox connection

 *  @hw: pointer to hardware structure

 *  @mbx: pointer to mailbox

 *

 *  This function will initiate a mailbox connection.  It will populate the

 *  mailbox with a broadcast connect message and then initialize the lock.

 *  This is safe since the connect message is a single DWORD so the mailbox

 *  transaction is guaranteed to be atomic.

 *

 *  This function will return an error if the mailbox has not been initiated

 *  or is currently in use.

 **/

static s32 fm10k_mbx_connect(struct fm10k_hw *hw, struct fm10k_mbx_info *mbx)

{

	/* we cannot connect an uninitialized mailbox */

	if (!mbx->rx.buffer)

		return FM10K_MBX_ERR_NO_SPACE;



	/* we cannot connect an already connected mailbox */

	if (mbx->state != FM10K_STATE_CLOSED)

		return FM10K_MBX_ERR_BUSY;



	/* mailbox timeout can now become active */

	mbx->timeout = FM10K_MBX_INIT_TIMEOUT;



	/* Place mbx in ready to connect state */

	mbx->state = FM10K_STATE_CONNECT;



	/* initialize header of remote mailbox */

	fm10k_mbx_create_disconnect_hdr(mbx);

	fm10k_write_reg(hw, mbx->mbmem_reg ^ mbx->mbmem_len, mbx->mbx_hdr);



	/* enable interrupt and notify other party of new message */

	mbx->mbx_lock = FM10K_MBX_REQ_INTERRUPT | FM10K_MBX_ACK_INTERRUPT |

			FM10K_MBX_INTERRUPT_ENABLE;



	/* generate and load connect header into mailbox */

	fm10k_mbx_create_connect_hdr(mbx);

	fm10k_mbx_write(hw, mbx);



	return 0;

}



/**

/**

 *  fm10k_mbx_validate_handlers - Validate layout of message parsing data

 *  fm10k_mbx_validate_handlers - Validate layout of message parsing data

 *  @msg_data: handlers for mailbox events

 *  @msg_data: handlers for mailbox events
@@ -805,6 +1498,83 @@ static s32 fm10k_mbx_register_handlers(struct fm10k_mbx_info *mbx, 
	return 0;

	return 0;

}

}





/**

 *  fm10k_pfvf_mbx_init - Initialize mailbox memory for PF/VF mailbox

 *  @hw: pointer to hardware structure

 *  @mbx: pointer to mailbox

 *  @msg_data: handlers for mailbox events

 *  @id: ID reference for PF as it supports up to 64 PF/VF mailboxes

 *

 *  This function initializes the mailbox for use.  It will split the

 *  buffer provided an use that th populate both the Tx and Rx FIFO by

 *  evenly splitting it.  In order to allow for easy masking of head/tail

 *  the value reported in size must be a power of 2 and is reported in

 *  DWORDs, not bytes.  Any invalid values will cause the mailbox to return

 *  error.

 **/

s32 fm10k_pfvf_mbx_init(struct fm10k_hw *hw, struct fm10k_mbx_info *mbx,

			const struct fm10k_msg_data *msg_data, u8 id)

{

	/* initialize registers */

	switch (hw->mac.type) {

	case fm10k_mac_pf:

		/* there are only 64 VF <-> PF mailboxes */

		if (id < 64) {

			mbx->mbx_reg = FM10K_MBX(id);

			mbx->mbmem_reg = FM10K_MBMEM_VF(id, 0);

			break;

		}

		/* fallthough */

	default:

		return FM10K_MBX_ERR_NO_MBX;

	}



	/* start out in closed state */

	mbx->state = FM10K_STATE_CLOSED;



	/* validate layout of handlers before assigning them */

	if (fm10k_mbx_validate_handlers(msg_data))

		return FM10K_ERR_PARAM;



	/* initialize the message handlers */

	mbx->msg_data = msg_data;



	/* start mailbox as timed out and let the reset_hw call

	 * set the timeout value to begin communications

	 */

	mbx->timeout = 0;

	mbx->udelay = FM10K_MBX_INIT_DELAY;



	/* initalize tail and head */

	mbx->tail = 1;

	mbx->head = 1;



	/* initialize CRC seeds */

	mbx->local = FM10K_MBX_CRC_SEED;

	mbx->remote = FM10K_MBX_CRC_SEED;



	/* Split buffer for use by Tx/Rx FIFOs */

	mbx->max_size = FM10K_MBX_MSG_MAX_SIZE;

	mbx->mbmem_len = FM10K_VFMBMEM_VF_XOR;



	/* initialize the FIFOs, sizes are in 4 byte increments */

	fm10k_fifo_init(&mbx->tx, mbx->buffer, FM10K_MBX_TX_BUFFER_SIZE);

	fm10k_fifo_init(&mbx->rx, &mbx->buffer[FM10K_MBX_TX_BUFFER_SIZE],

			FM10K_MBX_RX_BUFFER_SIZE);



	/* initialize function pointers */

	mbx->ops.connect = fm10k_mbx_connect;

	mbx->ops.disconnect = fm10k_mbx_disconnect;

	mbx->ops.rx_ready = fm10k_mbx_rx_ready;

	mbx->ops.tx_ready = fm10k_mbx_tx_ready;

	mbx->ops.tx_complete = fm10k_mbx_tx_complete;

	mbx->ops.enqueue_tx = fm10k_mbx_enqueue_tx;

	mbx->ops.process = fm10k_mbx_process;

	mbx->ops.register_handlers = fm10k_mbx_register_handlers;



	return 0;

}



/**

/**

 *  fm10k_sm_mbx_create_data_hdr - Generate a mailbox header for local FIFO

 *  fm10k_sm_mbx_create_data_hdr - Generate a mailbox header for local FIFO

 *  @mbx: pointer to mailbox

 *  @mbx: pointer to mailbox

drivers/net/ethernet/intel/fm10k/fm10k_mbx.h

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