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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: Alexander Duyck <alexander.h.duyck@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
This commit is contained in:
Alexander Duyck 2014-09-20 19:51:27 -04:00 committed by Jeff Kirsher
parent 5cd5e2e982
commit b651957c20
2 changed files with 834 additions and 0 deletions
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770
drivers/net/ethernet/intel/fm10k/fm10k_mbx.c
View File

@ -511,6 +511,148 @@ static s32 fm10k_mbx_push_tail(struct fm10k_hw *hw,
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
* @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;
}
/**
* 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
* @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
* @msg_data: handlers for mailbox events
@ -805,6 +1498,83 @@ static s32 fm10k_mbx_register_handlers(struct fm10k_mbx_info *mbx,
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
* @mbx: pointer to mailbox

64
drivers/net/ethernet/intel/fm10k/fm10k_mbx.h
View File

@ -99,6 +99,39 @@ enum fm10k_mbx_state {
FM10K_STATE_DISCONNECT,
};
/* PF/VF Mailbox header format
* 3 2 1 0
* 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Size/Err_no/CRC | Rsvd0 | Head | Tail | Type |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*
* The layout above describes the format for the header used in the PF/VF
* mailbox. The header is broken out into the following fields:
* Type: There are 4 supported message types
* 0x8: Data header - used to transport message data
* 0xC: Connect header - used to establish connection
* 0xD: Disconnect header - used to tear down a connection
* 0xE: Error header - used to address message exceptions
* Tail: Tail index for local FIFO
* Tail index actually consists of two parts. The MSB of
* the head is a loop tracker, it is 0 on an even numbered
* loop through the FIFO, and 1 on the odd numbered loops.
* To get the actual mailbox offset based on the tail it
* is necessary to add bit 3 to bit 0 and clear bit 3. This
* gives us a valid range of 0x1 - 0xE.
* Head: Head index for remote FIFO
* Head index follows the same format as the tail index.
* Rsvd0: Reserved 0 portion of the mailbox header
* CRC: Running CRC for all data since connect plus current message header
* Size: Maximum message size - Applies only to connect headers
* The maximum message size is provided during connect to avoid
* jamming the mailbox with messages that do not fit.
* Err_no: Error number - Applies only to error headers
* The error number provides a indication of the type of error
* experienced.
*/
/* macros for retriving and setting header values */
#define FM10K_MSG_HDR_MASK(name) \
((0x1u << FM10K_MSG_##name##_SIZE) - 1)
@ -107,6 +140,35 @@ enum fm10k_mbx_state {
#define FM10K_MSG_HDR_FIELD_GET(value, name) \
((u16)((value) >> FM10K_MSG_##name##_SHIFT) & FM10K_MSG_HDR_MASK(name))
/* offsets shared between all headers */
#define FM10K_MSG_TYPE_SHIFT 0
#define FM10K_MSG_TYPE_SIZE 4
#define FM10K_MSG_TAIL_SHIFT 4
#define FM10K_MSG_TAIL_SIZE 4
#define FM10K_MSG_HEAD_SHIFT 8
#define FM10K_MSG_HEAD_SIZE 4
#define FM10K_MSG_RSVD0_SHIFT 12
#define FM10K_MSG_RSVD0_SIZE 4
/* offsets for data/disconnect headers */
#define FM10K_MSG_CRC_SHIFT 16
#define FM10K_MSG_CRC_SIZE 16
/* offsets for connect headers */
#define FM10K_MSG_CONNECT_SIZE_SHIFT 16
#define FM10K_MSG_CONNECT_SIZE_SIZE 16
/* offsets for error headers */
#define FM10K_MSG_ERR_NO_SHIFT 16
#define FM10K_MSG_ERR_NO_SIZE 16
enum fm10k_msg_type {
FM10K_MSG_DATA = 0x8,
FM10K_MSG_CONNECT = 0xC,
FM10K_MSG_DISCONNECT = 0xD,
FM10K_MSG_ERROR = 0xE,
};
/* HNI/SM Mailbox FIFO format
* 3 2 1 0
* 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0
@ -237,6 +299,8 @@ struct fm10k_mbx_info {
u32 buffer[FM10K_MBX_BUFFER_SIZE];
};
s32 fm10k_pfvf_mbx_init(struct fm10k_hw *, struct fm10k_mbx_info *,
const struct fm10k_msg_data *, u8);
s32 fm10k_sm_mbx_init(struct fm10k_hw *, struct fm10k_mbx_info *,
const struct fm10k_msg_data *);