ceph/src/dpdk/drivers/net/ixgbe/base/ixgbe_mbx.c

   1 /*******************************************************************************
   2
   3 Copyright (c) 2001-2015, Intel Corporation
   4 All rights reserved.
   5
   6 Redistribution and use in source and binary forms, with or without
   7 modification, are permitted provided that the following conditions are met:
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  10     this list of conditions and the following disclaimer.
  11
  12  2. Redistributions in binary form must reproduce the above copyright
  13     notice, this list of conditions and the following disclaimer in the
  14     documentation and/or other materials provided with the distribution.
  15
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  18     this software without specific prior written permission.
  19
  20 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  21 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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  23 ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  24 LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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  28 CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  29 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  30 POSSIBILITY OF SUCH DAMAGE.
  31
  32 ***************************************************************************/
  33
  34 #include "ixgbe_type.h"
  35 #include "ixgbe_mbx.h"
  36
  37 /**
  38  *  ixgbe_read_mbx - Reads a message from the mailbox
  39  *  @hw: pointer to the HW structure
  40  *  @msg: The message buffer
  41  *  @size: Length of buffer
  42  *  @mbx_id: id of mailbox to read
  43  *
  44  *  returns SUCCESS if it successfully read message from buffer
  45  **/
  46 s32 ixgbe_read_mbx(struct ixgbe_hw *hw, u32 *msg, u16 size, u16 mbx_id)
  47 {
  48         struct ixgbe_mbx_info *mbx = &hw->mbx;
  49         s32 ret_val = IXGBE_ERR_MBX;
  50
  51         DEBUGFUNC("ixgbe_read_mbx");
  52
  53         /* limit read to size of mailbox */
  54         if (size > mbx->size)
  55                 size = mbx->size;
  56
  57         if (mbx->ops.read)
  58                 ret_val = mbx->ops.read(hw, msg, size, mbx_id);
  59
  60         return ret_val;
  61 }
  62
  63 /**
  64  *  ixgbe_write_mbx - Write a message to the mailbox
  65  *  @hw: pointer to the HW structure
  66  *  @msg: The message buffer
  67  *  @size: Length of buffer
  68  *  @mbx_id: id of mailbox to write
  69  *
  70  *  returns SUCCESS if it successfully copied message into the buffer
  71  **/
  72 s32 ixgbe_write_mbx(struct ixgbe_hw *hw, u32 *msg, u16 size, u16 mbx_id)
  73 {
  74         struct ixgbe_mbx_info *mbx = &hw->mbx;
  75         s32 ret_val = IXGBE_SUCCESS;
  76
  77         DEBUGFUNC("ixgbe_write_mbx");
  78
  79         if (size > mbx->size) {
  80                 ret_val = IXGBE_ERR_MBX;
  81                 ERROR_REPORT2(IXGBE_ERROR_ARGUMENT,
  82                              "Invalid mailbox message size %d", size);
  83         } else if (mbx->ops.write)
  84                 ret_val = mbx->ops.write(hw, msg, size, mbx_id);
  85
  86         return ret_val;
  87 }
  88
  89 /**
  90  *  ixgbe_check_for_msg - checks to see if someone sent us mail
  91  *  @hw: pointer to the HW structure
  92  *  @mbx_id: id of mailbox to check
  93  *
  94  *  returns SUCCESS if the Status bit was found or else ERR_MBX
  95  **/
  96 s32 ixgbe_check_for_msg(struct ixgbe_hw *hw, u16 mbx_id)
  97 {
  98         struct ixgbe_mbx_info *mbx = &hw->mbx;
  99         s32 ret_val = IXGBE_ERR_MBX;
 100
 101         DEBUGFUNC("ixgbe_check_for_msg");
 102
 103         if (mbx->ops.check_for_msg)
 104                 ret_val = mbx->ops.check_for_msg(hw, mbx_id);
 105
 106         return ret_val;
 107 }
 108
 109 /**
 110  *  ixgbe_check_for_ack - checks to see if someone sent us ACK
 111  *  @hw: pointer to the HW structure
 112  *  @mbx_id: id of mailbox to check
 113  *
 114  *  returns SUCCESS if the Status bit was found or else ERR_MBX
 115  **/
 116 s32 ixgbe_check_for_ack(struct ixgbe_hw *hw, u16 mbx_id)
 117 {
 118         struct ixgbe_mbx_info *mbx = &hw->mbx;
 119         s32 ret_val = IXGBE_ERR_MBX;
 120
 121         DEBUGFUNC("ixgbe_check_for_ack");
 122
 123         if (mbx->ops.check_for_ack)
 124                 ret_val = mbx->ops.check_for_ack(hw, mbx_id);
 125
 126         return ret_val;
 127 }
 128
 129 /**
 130  *  ixgbe_check_for_rst - checks to see if other side has reset
 131  *  @hw: pointer to the HW structure
 132  *  @mbx_id: id of mailbox to check
 133  *
 134  *  returns SUCCESS if the Status bit was found or else ERR_MBX
 135  **/
 136 s32 ixgbe_check_for_rst(struct ixgbe_hw *hw, u16 mbx_id)
 137 {
 138         struct ixgbe_mbx_info *mbx = &hw->mbx;
 139         s32 ret_val = IXGBE_ERR_MBX;
 140
 141         DEBUGFUNC("ixgbe_check_for_rst");
 142
 143         if (mbx->ops.check_for_rst)
 144                 ret_val = mbx->ops.check_for_rst(hw, mbx_id);
 145
 146         return ret_val;
 147 }
 148
 149 /**
 150  *  ixgbe_poll_for_msg - Wait for message notification
 151  *  @hw: pointer to the HW structure
 152  *  @mbx_id: id of mailbox to write
 153  *
 154  *  returns SUCCESS if it successfully received a message notification
 155  **/
 156 STATIC s32 ixgbe_poll_for_msg(struct ixgbe_hw *hw, u16 mbx_id)
 157 {
 158         struct ixgbe_mbx_info *mbx = &hw->mbx;
 159         int countdown = mbx->timeout;
 160
 161         DEBUGFUNC("ixgbe_poll_for_msg");
 162
 163         if (!countdown || !mbx->ops.check_for_msg)
 164                 goto out;
 165
 166         while (countdown && mbx->ops.check_for_msg(hw, mbx_id)) {
 167                 countdown--;
 168                 if (!countdown)
 169                         break;
 170                 usec_delay(mbx->usec_delay);
 171         }
 172
 173         if (countdown == 0)
 174                 ERROR_REPORT2(IXGBE_ERROR_POLLING,
 175                            "Polling for VF%d mailbox message timedout", mbx_id);
 176
 177 out:
 178         return countdown ? IXGBE_SUCCESS : IXGBE_ERR_MBX;
 179 }
 180
 181 /**
 182  *  ixgbe_poll_for_ack - Wait for message acknowledgement
 183  *  @hw: pointer to the HW structure
 184  *  @mbx_id: id of mailbox to write
 185  *
 186  *  returns SUCCESS if it successfully received a message acknowledgement
 187  **/
 188 STATIC s32 ixgbe_poll_for_ack(struct ixgbe_hw *hw, u16 mbx_id)
 189 {
 190         struct ixgbe_mbx_info *mbx = &hw->mbx;
 191         int countdown = mbx->timeout;
 192
 193         DEBUGFUNC("ixgbe_poll_for_ack");
 194
 195         if (!countdown || !mbx->ops.check_for_ack)
 196                 goto out;
 197
 198         while (countdown && mbx->ops.check_for_ack(hw, mbx_id)) {
 199                 countdown--;
 200                 if (!countdown)
 201                         break;
 202                 usec_delay(mbx->usec_delay);
 203         }
 204
 205         if (countdown == 0)
 206                 ERROR_REPORT2(IXGBE_ERROR_POLLING,
 207                              "Polling for VF%d mailbox ack timedout", mbx_id);
 208
 209 out:
 210         return countdown ? IXGBE_SUCCESS : IXGBE_ERR_MBX;
 211 }
 212
 213 /**
 214  *  ixgbe_read_posted_mbx - Wait for message notification and receive message
 215  *  @hw: pointer to the HW structure
 216  *  @msg: The message buffer
 217  *  @size: Length of buffer
 218  *  @mbx_id: id of mailbox to write
 219  *
 220  *  returns SUCCESS if it successfully received a message notification and
 221  *  copied it into the receive buffer.
 222  **/
 223 s32 ixgbe_read_posted_mbx(struct ixgbe_hw *hw, u32 *msg, u16 size, u16 mbx_id)
 224 {
 225         struct ixgbe_mbx_info *mbx = &hw->mbx;
 226         s32 ret_val = IXGBE_ERR_MBX;
 227
 228         DEBUGFUNC("ixgbe_read_posted_mbx");
 229
 230         if (!mbx->ops.read)
 231                 goto out;
 232
 233         ret_val = ixgbe_poll_for_msg(hw, mbx_id);
 234
 235         /* if ack received read message, otherwise we timed out */
 236         if (!ret_val)
 237                 ret_val = mbx->ops.read(hw, msg, size, mbx_id);
 238 out:
 239         return ret_val;
 240 }
 241
 242 /**
 243  *  ixgbe_write_posted_mbx - Write a message to the mailbox, wait for ack
 244  *  @hw: pointer to the HW structure
 245  *  @msg: The message buffer
 246  *  @size: Length of buffer
 247  *  @mbx_id: id of mailbox to write
 248  *
 249  *  returns SUCCESS if it successfully copied message into the buffer and
 250  *  received an ack to that message within delay * timeout period
 251  **/
 252 s32 ixgbe_write_posted_mbx(struct ixgbe_hw *hw, u32 *msg, u16 size,
 253                            u16 mbx_id)
 254 {
 255         struct ixgbe_mbx_info *mbx = &hw->mbx;
 256         s32 ret_val = IXGBE_ERR_MBX;
 257
 258         DEBUGFUNC("ixgbe_write_posted_mbx");
 259
 260         /* exit if either we can't write or there isn't a defined timeout */
 261         if (!mbx->ops.write || !mbx->timeout)
 262                 goto out;
 263
 264         /* send msg */
 265         ret_val = mbx->ops.write(hw, msg, size, mbx_id);
 266
 267         /* if msg sent wait until we receive an ack */
 268         if (!ret_val)
 269                 ret_val = ixgbe_poll_for_ack(hw, mbx_id);
 270 out:
 271         return ret_val;
 272 }
 273
 274 /**
 275  *  ixgbe_init_mbx_ops_generic - Initialize MB function pointers
 276  *  @hw: pointer to the HW structure
 277  *
 278  *  Setups up the mailbox read and write message function pointers
 279  **/
 280 void ixgbe_init_mbx_ops_generic(struct ixgbe_hw *hw)
 281 {
 282         struct ixgbe_mbx_info *mbx = &hw->mbx;
 283
 284         mbx->ops.read_posted = ixgbe_read_posted_mbx;
 285         mbx->ops.write_posted = ixgbe_write_posted_mbx;
 286 }
 287
 288 /**
 289  *  ixgbe_read_v2p_mailbox - read v2p mailbox
 290  *  @hw: pointer to the HW structure
 291  *
 292  *  This function is used to read the v2p mailbox without losing the read to
 293  *  clear status bits.
 294  **/
 295 STATIC u32 ixgbe_read_v2p_mailbox(struct ixgbe_hw *hw)
 296 {
 297         u32 v2p_mailbox = IXGBE_READ_REG(hw, IXGBE_VFMAILBOX);
 298
 299         v2p_mailbox |= hw->mbx.v2p_mailbox;
 300         hw->mbx.v2p_mailbox |= v2p_mailbox & IXGBE_VFMAILBOX_R2C_BITS;
 301
 302         return v2p_mailbox;
 303 }
 304
 305 /**
 306  *  ixgbe_check_for_bit_vf - Determine if a status bit was set
 307  *  @hw: pointer to the HW structure
 308  *  @mask: bitmask for bits to be tested and cleared
 309  *
 310  *  This function is used to check for the read to clear bits within
 311  *  the V2P mailbox.
 312  **/
 313 STATIC s32 ixgbe_check_for_bit_vf(struct ixgbe_hw *hw, u32 mask)
 314 {
 315         u32 v2p_mailbox = ixgbe_read_v2p_mailbox(hw);
 316         s32 ret_val = IXGBE_ERR_MBX;
 317
 318         if (v2p_mailbox & mask)
 319                 ret_val = IXGBE_SUCCESS;
 320
 321         hw->mbx.v2p_mailbox &= ~mask;
 322
 323         return ret_val;
 324 }
 325
 326 /**
 327  *  ixgbe_check_for_msg_vf - checks to see if the PF has sent mail
 328  *  @hw: pointer to the HW structure
 329  *  @mbx_id: id of mailbox to check
 330  *
 331  *  returns SUCCESS if the PF has set the Status bit or else ERR_MBX
 332  **/
 333 STATIC s32 ixgbe_check_for_msg_vf(struct ixgbe_hw *hw, u16 mbx_id)
 334 {
 335         s32 ret_val = IXGBE_ERR_MBX;
 336
 337         UNREFERENCED_1PARAMETER(mbx_id);
 338         DEBUGFUNC("ixgbe_check_for_msg_vf");
 339
 340         if (!ixgbe_check_for_bit_vf(hw, IXGBE_VFMAILBOX_PFSTS)) {
 341                 ret_val = IXGBE_SUCCESS;
 342                 hw->mbx.stats.reqs++;
 343         }
 344
 345         return ret_val;
 346 }
 347
 348 /**
 349  *  ixgbe_check_for_ack_vf - checks to see if the PF has ACK'd
 350  *  @hw: pointer to the HW structure
 351  *  @mbx_id: id of mailbox to check
 352  *
 353  *  returns SUCCESS if the PF has set the ACK bit or else ERR_MBX
 354  **/
 355 STATIC s32 ixgbe_check_for_ack_vf(struct ixgbe_hw *hw, u16 mbx_id)
 356 {
 357         s32 ret_val = IXGBE_ERR_MBX;
 358
 359         UNREFERENCED_1PARAMETER(mbx_id);
 360         DEBUGFUNC("ixgbe_check_for_ack_vf");
 361
 362         if (!ixgbe_check_for_bit_vf(hw, IXGBE_VFMAILBOX_PFACK)) {
 363                 ret_val = IXGBE_SUCCESS;
 364                 hw->mbx.stats.acks++;
 365         }
 366
 367         return ret_val;
 368 }
 369
 370 /**
 371  *  ixgbe_check_for_rst_vf - checks to see if the PF has reset
 372  *  @hw: pointer to the HW structure
 373  *  @mbx_id: id of mailbox to check
 374  *
 375  *  returns true if the PF has set the reset done bit or else false
 376  **/
 377 STATIC s32 ixgbe_check_for_rst_vf(struct ixgbe_hw *hw, u16 mbx_id)
 378 {
 379         s32 ret_val = IXGBE_ERR_MBX;
 380
 381         UNREFERENCED_1PARAMETER(mbx_id);
 382         DEBUGFUNC("ixgbe_check_for_rst_vf");
 383
 384         if (!ixgbe_check_for_bit_vf(hw, (IXGBE_VFMAILBOX_RSTD |
 385             IXGBE_VFMAILBOX_RSTI))) {
 386                 ret_val = IXGBE_SUCCESS;
 387                 hw->mbx.stats.rsts++;
 388         }
 389
 390         return ret_val;
 391 }
 392
 393 /**
 394  *  ixgbe_obtain_mbx_lock_vf - obtain mailbox lock
 395  *  @hw: pointer to the HW structure
 396  *
 397  *  return SUCCESS if we obtained the mailbox lock
 398  **/
 399 STATIC s32 ixgbe_obtain_mbx_lock_vf(struct ixgbe_hw *hw)
 400 {
 401         s32 ret_val = IXGBE_ERR_MBX;
 402
 403         DEBUGFUNC("ixgbe_obtain_mbx_lock_vf");
 404
 405         /* Take ownership of the buffer */
 406         IXGBE_WRITE_REG(hw, IXGBE_VFMAILBOX, IXGBE_VFMAILBOX_VFU);
 407
 408         /* reserve mailbox for vf use */
 409         if (ixgbe_read_v2p_mailbox(hw) & IXGBE_VFMAILBOX_VFU)
 410                 ret_val = IXGBE_SUCCESS;
 411
 412         return ret_val;
 413 }
 414
 415 /**
 416  *  ixgbe_write_mbx_vf - Write a message to the mailbox
 417  *  @hw: pointer to the HW structure
 418  *  @msg: The message buffer
 419  *  @size: Length of buffer
 420  *  @mbx_id: id of mailbox to write
 421  *
 422  *  returns SUCCESS if it successfully copied message into the buffer
 423  **/
 424 STATIC s32 ixgbe_write_mbx_vf(struct ixgbe_hw *hw, u32 *msg, u16 size,
 425                               u16 mbx_id)
 426 {
 427         s32 ret_val;
 428         u16 i;
 429
 430         UNREFERENCED_1PARAMETER(mbx_id);
 431
 432         DEBUGFUNC("ixgbe_write_mbx_vf");
 433
 434         /* lock the mailbox to prevent pf/vf race condition */
 435         ret_val = ixgbe_obtain_mbx_lock_vf(hw);
 436         if (ret_val)
 437                 goto out_no_write;
 438
 439         /* flush msg and acks as we are overwriting the message buffer */
 440         ixgbe_check_for_msg_vf(hw, 0);
 441         ixgbe_check_for_ack_vf(hw, 0);
 442
 443         /* copy the caller specified message to the mailbox memory buffer */
 444         for (i = 0; i < size; i++)
 445                 IXGBE_WRITE_REG_ARRAY(hw, IXGBE_VFMBMEM, i, msg[i]);
 446
 447         /*
 448          * Complete the remaining mailbox data registers with zero to reset
 449          * the data sent in a previous exchange (in either side) with the PF,
 450          * including exchanges performed by another Guest OS to which that VF
 451          * was previously assigned.
 452          */
 453         while (i < hw->mbx.size) {
 454                 IXGBE_WRITE_REG_ARRAY(hw, IXGBE_VFMBMEM, i, 0);
 455                 i++;
 456         }
 457
 458         /* update stats */
 459         hw->mbx.stats.msgs_tx++;
 460
 461         /* Drop VFU and interrupt the PF to tell it a message has been sent */
 462         IXGBE_WRITE_REG(hw, IXGBE_VFMAILBOX, IXGBE_VFMAILBOX_REQ);
 463
 464 out_no_write:
 465         return ret_val;
 466 }
 467
 468 /**
 469  *  ixgbe_read_mbx_vf - Reads a message from the inbox intended for vf
 470  *  @hw: pointer to the HW structure
 471  *  @msg: The message buffer
 472  *  @size: Length of buffer
 473  *  @mbx_id: id of mailbox to read
 474  *
 475  *  returns SUCCESS if it successfully read message from buffer
 476  **/
 477 STATIC s32 ixgbe_read_mbx_vf(struct ixgbe_hw *hw, u32 *msg, u16 size,
 478                              u16 mbx_id)
 479 {
 480         s32 ret_val = IXGBE_SUCCESS;
 481         u16 i;
 482
 483         DEBUGFUNC("ixgbe_read_mbx_vf");
 484         UNREFERENCED_1PARAMETER(mbx_id);
 485
 486         /* lock the mailbox to prevent pf/vf race condition */
 487         ret_val = ixgbe_obtain_mbx_lock_vf(hw);
 488         if (ret_val)
 489                 goto out_no_read;
 490
 491         /* copy the message from the mailbox memory buffer */
 492         for (i = 0; i < size; i++)
 493                 msg[i] = IXGBE_READ_REG_ARRAY(hw, IXGBE_VFMBMEM, i);
 494
 495         /* Acknowledge receipt and release mailbox, then we're done */
 496         IXGBE_WRITE_REG(hw, IXGBE_VFMAILBOX, IXGBE_VFMAILBOX_ACK);
 497
 498         /* update stats */
 499         hw->mbx.stats.msgs_rx++;
 500
 501 out_no_read:
 502         return ret_val;
 503 }
 504
 505 /**
 506  *  ixgbe_init_mbx_params_vf - set initial values for vf mailbox
 507  *  @hw: pointer to the HW structure
 508  *
 509  *  Initializes the hw->mbx struct to correct values for vf mailbox
 510  */
 511 void ixgbe_init_mbx_params_vf(struct ixgbe_hw *hw)
 512 {
 513         struct ixgbe_mbx_info *mbx = &hw->mbx;
 514
 515         /* start mailbox as timed out and let the reset_hw call set the timeout
 516          * value to begin communications */
 517         mbx->timeout = 0;
 518         mbx->usec_delay = IXGBE_VF_MBX_INIT_DELAY;
 519
 520         mbx->size = IXGBE_VFMAILBOX_SIZE;
 521
 522         mbx->ops.read = ixgbe_read_mbx_vf;
 523         mbx->ops.write = ixgbe_write_mbx_vf;
 524         mbx->ops.read_posted = ixgbe_read_posted_mbx;
 525         mbx->ops.write_posted = ixgbe_write_posted_mbx;
 526         mbx->ops.check_for_msg = ixgbe_check_for_msg_vf;
 527         mbx->ops.check_for_ack = ixgbe_check_for_ack_vf;
 528         mbx->ops.check_for_rst = ixgbe_check_for_rst_vf;
 529
 530         mbx->stats.msgs_tx = 0;
 531         mbx->stats.msgs_rx = 0;
 532         mbx->stats.reqs = 0;
 533         mbx->stats.acks = 0;
 534         mbx->stats.rsts = 0;
 535 }
 536
 537 STATIC s32 ixgbe_check_for_bit_pf(struct ixgbe_hw *hw, u32 mask, s32 index)
 538 {
 539         u32 mbvficr = IXGBE_READ_REG(hw, IXGBE_MBVFICR(index));
 540         s32 ret_val = IXGBE_ERR_MBX;
 541
 542         if (mbvficr & mask) {
 543                 ret_val = IXGBE_SUCCESS;
 544                 IXGBE_WRITE_REG(hw, IXGBE_MBVFICR(index), mask);
 545         }
 546
 547         return ret_val;
 548 }
 549
 550 /**
 551  *  ixgbe_check_for_msg_pf - checks to see if the VF has sent mail
 552  *  @hw: pointer to the HW structure
 553  *  @vf_number: the VF index
 554  *
 555  *  returns SUCCESS if the VF has set the Status bit or else ERR_MBX
 556  **/
 557 STATIC s32 ixgbe_check_for_msg_pf(struct ixgbe_hw *hw, u16 vf_number)
 558 {
 559         s32 ret_val = IXGBE_ERR_MBX;
 560         s32 index = IXGBE_MBVFICR_INDEX(vf_number);
 561         u32 vf_bit = vf_number % 16;
 562
 563         DEBUGFUNC("ixgbe_check_for_msg_pf");
 564
 565         if (!ixgbe_check_for_bit_pf(hw, IXGBE_MBVFICR_VFREQ_VF1 << vf_bit,
 566                                     index)) {
 567                 ret_val = IXGBE_SUCCESS;
 568                 hw->mbx.stats.reqs++;
 569         }
 570
 571         return ret_val;
 572 }
 573
 574 /**
 575  *  ixgbe_check_for_ack_pf - checks to see if the VF has ACKed
 576  *  @hw: pointer to the HW structure
 577  *  @vf_number: the VF index
 578  *
 579  *  returns SUCCESS if the VF has set the Status bit or else ERR_MBX
 580  **/
 581 STATIC s32 ixgbe_check_for_ack_pf(struct ixgbe_hw *hw, u16 vf_number)
 582 {
 583         s32 ret_val = IXGBE_ERR_MBX;
 584         s32 index = IXGBE_MBVFICR_INDEX(vf_number);
 585         u32 vf_bit = vf_number % 16;
 586
 587         DEBUGFUNC("ixgbe_check_for_ack_pf");
 588
 589         if (!ixgbe_check_for_bit_pf(hw, IXGBE_MBVFICR_VFACK_VF1 << vf_bit,
 590                                     index)) {
 591                 ret_val = IXGBE_SUCCESS;
 592                 hw->mbx.stats.acks++;
 593         }
 594
 595         return ret_val;
 596 }
 597
 598 /**
 599  *  ixgbe_check_for_rst_pf - checks to see if the VF has reset
 600  *  @hw: pointer to the HW structure
 601  *  @vf_number: the VF index
 602  *
 603  *  returns SUCCESS if the VF has set the Status bit or else ERR_MBX
 604  **/
 605 STATIC s32 ixgbe_check_for_rst_pf(struct ixgbe_hw *hw, u16 vf_number)
 606 {
 607         u32 reg_offset = (vf_number < 32) ? 0 : 1;
 608         u32 vf_shift = vf_number % 32;
 609         u32 vflre = 0;
 610         s32 ret_val = IXGBE_ERR_MBX;
 611
 612         DEBUGFUNC("ixgbe_check_for_rst_pf");
 613
 614         switch (hw->mac.type) {
 615         case ixgbe_mac_82599EB:
 616                 vflre = IXGBE_READ_REG(hw, IXGBE_VFLRE(reg_offset));
 617                 break;
 618         case ixgbe_mac_X550:
 619         case ixgbe_mac_X550EM_x:
 620         case ixgbe_mac_X550EM_a:
 621         case ixgbe_mac_X540:
 622                 vflre = IXGBE_READ_REG(hw, IXGBE_VFLREC(reg_offset));
 623                 break;
 624         default:
 625                 break;
 626         }
 627
 628         if (vflre & (1 << vf_shift)) {
 629                 ret_val = IXGBE_SUCCESS;
 630                 IXGBE_WRITE_REG(hw, IXGBE_VFLREC(reg_offset), (1 << vf_shift));
 631                 hw->mbx.stats.rsts++;
 632         }
 633
 634         return ret_val;
 635 }
 636
 637 /**
 638  *  ixgbe_obtain_mbx_lock_pf - obtain mailbox lock
 639  *  @hw: pointer to the HW structure
 640  *  @vf_number: the VF index
 641  *
 642  *  return SUCCESS if we obtained the mailbox lock
 643  **/
 644 STATIC s32 ixgbe_obtain_mbx_lock_pf(struct ixgbe_hw *hw, u16 vf_number)
 645 {
 646         s32 ret_val = IXGBE_ERR_MBX;
 647         u32 p2v_mailbox;
 648
 649         DEBUGFUNC("ixgbe_obtain_mbx_lock_pf");
 650
 651         /* Take ownership of the buffer */
 652         IXGBE_WRITE_REG(hw, IXGBE_PFMAILBOX(vf_number), IXGBE_PFMAILBOX_PFU);
 653
 654         /* reserve mailbox for vf use */
 655         p2v_mailbox = IXGBE_READ_REG(hw, IXGBE_PFMAILBOX(vf_number));
 656         if (p2v_mailbox & IXGBE_PFMAILBOX_PFU)
 657                 ret_val = IXGBE_SUCCESS;
 658         else
 659                 ERROR_REPORT2(IXGBE_ERROR_POLLING,
 660                            "Failed to obtain mailbox lock for VF%d", vf_number);
 661
 662
 663         return ret_val;
 664 }
 665
 666 /**
 667  *  ixgbe_write_mbx_pf - Places a message in the mailbox
 668  *  @hw: pointer to the HW structure
 669  *  @msg: The message buffer
 670  *  @size: Length of buffer
 671  *  @vf_number: the VF index
 672  *
 673  *  returns SUCCESS if it successfully copied message into the buffer
 674  **/
 675 STATIC s32 ixgbe_write_mbx_pf(struct ixgbe_hw *hw, u32 *msg, u16 size,
 676                               u16 vf_number)
 677 {
 678         s32 ret_val;
 679         u16 i;
 680
 681         DEBUGFUNC("ixgbe_write_mbx_pf");
 682
 683         /* lock the mailbox to prevent pf/vf race condition */
 684         ret_val = ixgbe_obtain_mbx_lock_pf(hw, vf_number);
 685         if (ret_val)
 686                 goto out_no_write;
 687
 688         /* flush msg and acks as we are overwriting the message buffer */
 689         ixgbe_check_for_msg_pf(hw, vf_number);
 690         ixgbe_check_for_ack_pf(hw, vf_number);
 691
 692         /* copy the caller specified message to the mailbox memory buffer */
 693         for (i = 0; i < size; i++)
 694                 IXGBE_WRITE_REG_ARRAY(hw, IXGBE_PFMBMEM(vf_number), i, msg[i]);
 695
 696         /*
 697          * Complete the remaining mailbox data registers with zero to reset
 698          * the data sent in a previous exchange (in either side) with the VF,
 699          * including exchanges performed by another Guest OS to which that VF
 700          * was previously assigned.
 701          */
 702         while (i < hw->mbx.size) {
 703                 IXGBE_WRITE_REG_ARRAY(hw, IXGBE_PFMBMEM(vf_number), i, 0);
 704                 i++;
 705         }
 706
 707         /* Interrupt VF to tell it a message has been sent and release buffer*/
 708         IXGBE_WRITE_REG(hw, IXGBE_PFMAILBOX(vf_number), IXGBE_PFMAILBOX_STS);
 709
 710         /* update stats */
 711         hw->mbx.stats.msgs_tx++;
 712
 713 out_no_write:
 714         return ret_val;
 715
 716 }
 717
 718 /**
 719  *  ixgbe_read_mbx_pf - Read a message from the mailbox
 720  *  @hw: pointer to the HW structure
 721  *  @msg: The message buffer
 722  *  @size: Length of buffer
 723  *  @vf_number: the VF index
 724  *
 725  *  This function copies a message from the mailbox buffer to the caller's
 726  *  memory buffer.  The presumption is that the caller knows that there was
 727  *  a message due to a VF request so no polling for message is needed.
 728  **/
 729 STATIC s32 ixgbe_read_mbx_pf(struct ixgbe_hw *hw, u32 *msg, u16 size,
 730                              u16 vf_number)
 731 {
 732         s32 ret_val;
 733         u16 i;
 734
 735         DEBUGFUNC("ixgbe_read_mbx_pf");
 736
 737         /* lock the mailbox to prevent pf/vf race condition */
 738         ret_val = ixgbe_obtain_mbx_lock_pf(hw, vf_number);
 739         if (ret_val)
 740                 goto out_no_read;
 741
 742         /* copy the message to the mailbox memory buffer */
 743         for (i = 0; i < size; i++)
 744                 msg[i] = IXGBE_READ_REG_ARRAY(hw, IXGBE_PFMBMEM(vf_number), i);
 745
 746         /* Acknowledge the message and release buffer */
 747         IXGBE_WRITE_REG(hw, IXGBE_PFMAILBOX(vf_number), IXGBE_PFMAILBOX_ACK);
 748
 749         /* update stats */
 750         hw->mbx.stats.msgs_rx++;
 751
 752 out_no_read:
 753         return ret_val;
 754 }
 755
 756 /**
 757  *  ixgbe_init_mbx_params_pf - set initial values for pf mailbox
 758  *  @hw: pointer to the HW structure
 759  *
 760  *  Initializes the hw->mbx struct to correct values for pf mailbox
 761  */
 762 void ixgbe_init_mbx_params_pf(struct ixgbe_hw *hw)
 763 {
 764         struct ixgbe_mbx_info *mbx = &hw->mbx;
 765
 766         if (hw->mac.type != ixgbe_mac_82599EB &&
 767             hw->mac.type != ixgbe_mac_X550 &&
 768             hw->mac.type != ixgbe_mac_X550EM_x &&
 769             hw->mac.type != ixgbe_mac_X550EM_a &&
 770             hw->mac.type != ixgbe_mac_X540)
 771                 return;
 772
 773         mbx->timeout = 0;
 774         mbx->usec_delay = 0;
 775
 776         mbx->size = IXGBE_VFMAILBOX_SIZE;
 777
 778         mbx->ops.read = ixgbe_read_mbx_pf;
 779         mbx->ops.write = ixgbe_write_mbx_pf;
 780         mbx->ops.read_posted = ixgbe_read_posted_mbx;
 781         mbx->ops.write_posted = ixgbe_write_posted_mbx;
 782         mbx->ops.check_for_msg = ixgbe_check_for_msg_pf;
 783         mbx->ops.check_for_ack = ixgbe_check_for_ack_pf;
 784         mbx->ops.check_for_rst = ixgbe_check_for_rst_pf;
 785
 786         mbx->stats.msgs_tx = 0;
 787         mbx->stats.msgs_rx = 0;
 788         mbx->stats.reqs = 0;
 789         mbx->stats.acks = 0;
 790         mbx->stats.rsts = 0;
 791 }