drivers/net/ethernet/intel/ixgbe/ixgbe_mbx.c

   1 /*******************************************************************************
   2
   3   Intel 10 Gigabit PCI Express Linux driver
   4   Copyright(c) 1999 - 2012 Intel Corporation.
   5
   6   This program is free software; you can redistribute it and/or modify it
   7   under the terms and conditions of the GNU General Public License,
   8   version 2, as published by the Free Software Foundation.
   9
  10   This program is distributed in the hope it will be useful, but WITHOUT
  11   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12   FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  13   more details.
  14
  15   You should have received a copy of the GNU General Public License along with
  16   this program; if not, write to the Free Software Foundation, Inc.,
  17   51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
  18
  19   The full GNU General Public License is included in this distribution in
  20   the file called "COPYING".
  21
  22   Contact Information:
  23   e1000-devel Mailing List <e1000-devel@lists.sourceforge.net>
  24   Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  25
  26 *******************************************************************************/
  27
  28 #include <linux/pci.h>
  29 #include <linux/delay.h>
  30 #include "ixgbe_type.h"
  31 #include "ixgbe_common.h"
  32 #include "ixgbe_mbx.h"
  33
  34 /**
  35  *  ixgbe_read_mbx - Reads a message from the mailbox
  36  *  @hw: pointer to the HW structure
  37  *  @msg: The message buffer
  38  *  @size: Length of buffer
  39  *  @mbx_id: id of mailbox to read
  40  *
  41  *  returns SUCCESS if it successfully read message from buffer
  42  **/
  43 s32 ixgbe_read_mbx(struct ixgbe_hw *hw, u32 *msg, u16 size, u16 mbx_id)
  44 {
  45         struct ixgbe_mbx_info *mbx = &hw->mbx;
  46         s32 ret_val = IXGBE_ERR_MBX;
  47
  48         /* limit read to size of mailbox */
  49         if (size > mbx->size)
  50                 size = mbx->size;
  51
  52         if (mbx->ops.read)
  53                 ret_val = mbx->ops.read(hw, msg, size, mbx_id);
  54
  55         return ret_val;
  56 }
  57
  58 /**
  59  *  ixgbe_write_mbx - Write a message to the mailbox
  60  *  @hw: pointer to the HW structure
  61  *  @msg: The message buffer
  62  *  @size: Length of buffer
  63  *  @mbx_id: id of mailbox to write
  64  *
  65  *  returns SUCCESS if it successfully copied message into the buffer
  66  **/
  67 s32 ixgbe_write_mbx(struct ixgbe_hw *hw, u32 *msg, u16 size, u16 mbx_id)
  68 {
  69         struct ixgbe_mbx_info *mbx = &hw->mbx;
  70         s32 ret_val = 0;
  71
  72         if (size > mbx->size)
  73                 ret_val = IXGBE_ERR_MBX;
  74
  75         else if (mbx->ops.write)
  76                 ret_val = mbx->ops.write(hw, msg, size, mbx_id);
  77
  78         return ret_val;
  79 }
  80
  81 /**
  82  *  ixgbe_check_for_msg - checks to see if someone sent us mail
  83  *  @hw: pointer to the HW structure
  84  *  @mbx_id: id of mailbox to check
  85  *
  86  *  returns SUCCESS if the Status bit was found or else ERR_MBX
  87  **/
  88 s32 ixgbe_check_for_msg(struct ixgbe_hw *hw, u16 mbx_id)
  89 {
  90         struct ixgbe_mbx_info *mbx = &hw->mbx;
  91         s32 ret_val = IXGBE_ERR_MBX;
  92
  93         if (mbx->ops.check_for_msg)
  94                 ret_val = mbx->ops.check_for_msg(hw, mbx_id);
  95
  96         return ret_val;
  97 }
  98
  99 /**
 100  *  ixgbe_check_for_ack - checks to see if someone sent us ACK
 101  *  @hw: pointer to the HW structure
 102  *  @mbx_id: id of mailbox to check
 103  *
 104  *  returns SUCCESS if the Status bit was found or else ERR_MBX
 105  **/
 106 s32 ixgbe_check_for_ack(struct ixgbe_hw *hw, u16 mbx_id)
 107 {
 108         struct ixgbe_mbx_info *mbx = &hw->mbx;
 109         s32 ret_val = IXGBE_ERR_MBX;
 110
 111         if (mbx->ops.check_for_ack)
 112                 ret_val = mbx->ops.check_for_ack(hw, mbx_id);
 113
 114         return ret_val;
 115 }
 116
 117 /**
 118  *  ixgbe_check_for_rst - checks to see if other side has reset
 119  *  @hw: pointer to the HW structure
 120  *  @mbx_id: id of mailbox to check
 121  *
 122  *  returns SUCCESS if the Status bit was found or else ERR_MBX
 123  **/
 124 s32 ixgbe_check_for_rst(struct ixgbe_hw *hw, u16 mbx_id)
 125 {
 126         struct ixgbe_mbx_info *mbx = &hw->mbx;
 127         s32 ret_val = IXGBE_ERR_MBX;
 128
 129         if (mbx->ops.check_for_rst)
 130                 ret_val = mbx->ops.check_for_rst(hw, mbx_id);
 131
 132         return ret_val;
 133 }
 134
 135 /**
 136  *  ixgbe_poll_for_msg - Wait for message notification
 137  *  @hw: pointer to the HW structure
 138  *  @mbx_id: id of mailbox to write
 139  *
 140  *  returns SUCCESS if it successfully received a message notification
 141  **/
 142 static s32 ixgbe_poll_for_msg(struct ixgbe_hw *hw, u16 mbx_id)
 143 {
 144         struct ixgbe_mbx_info *mbx = &hw->mbx;
 145         int countdown = mbx->timeout;
 146
 147         if (!countdown || !mbx->ops.check_for_msg)
 148                 goto out;
 149
 150         while (countdown && mbx->ops.check_for_msg(hw, mbx_id)) {
 151                 countdown--;
 152                 if (!countdown)
 153                         break;
 154                 udelay(mbx->usec_delay);
 155         }
 156
 157 out:
 158         return countdown ? 0 : IXGBE_ERR_MBX;
 159 }
 160
 161 /**
 162  *  ixgbe_poll_for_ack - Wait for message acknowledgement
 163  *  @hw: pointer to the HW structure
 164  *  @mbx_id: id of mailbox to write
 165  *
 166  *  returns SUCCESS if it successfully received a message acknowledgement
 167  **/
 168 static s32 ixgbe_poll_for_ack(struct ixgbe_hw *hw, u16 mbx_id)
 169 {
 170         struct ixgbe_mbx_info *mbx = &hw->mbx;
 171         int countdown = mbx->timeout;
 172
 173         if (!countdown || !mbx->ops.check_for_ack)
 174                 goto out;
 175
 176         while (countdown && mbx->ops.check_for_ack(hw, mbx_id)) {
 177                 countdown--;
 178                 if (!countdown)
 179                         break;
 180                 udelay(mbx->usec_delay);
 181         }
 182
 183 out:
 184         return countdown ? 0 : IXGBE_ERR_MBX;
 185 }
 186
 187 /**
 188  *  ixgbe_read_posted_mbx - Wait for message notification and receive message
 189  *  @hw: pointer to the HW structure
 190  *  @msg: The message buffer
 191  *  @size: Length of buffer
 192  *  @mbx_id: id of mailbox to write
 193  *
 194  *  returns SUCCESS if it successfully received a message notification and
 195  *  copied it into the receive buffer.
 196  **/
 197 static s32 ixgbe_read_posted_mbx(struct ixgbe_hw *hw, u32 *msg, u16 size,
 198                                  u16 mbx_id)
 199 {
 200         struct ixgbe_mbx_info *mbx = &hw->mbx;
 201         s32 ret_val = IXGBE_ERR_MBX;
 202
 203         if (!mbx->ops.read)
 204                 goto out;
 205
 206         ret_val = ixgbe_poll_for_msg(hw, mbx_id);
 207
 208         /* if ack received read message, otherwise we timed out */
 209         if (!ret_val)
 210                 ret_val = mbx->ops.read(hw, msg, size, mbx_id);
 211 out:
 212         return ret_val;
 213 }
 214
 215 /**
 216  *  ixgbe_write_posted_mbx - Write a message to the mailbox, wait for ack
 217  *  @hw: pointer to the HW structure
 218  *  @msg: The message buffer
 219  *  @size: Length of buffer
 220  *  @mbx_id: id of mailbox to write
 221  *
 222  *  returns SUCCESS if it successfully copied message into the buffer and
 223  *  received an ack to that message within delay * timeout period
 224  **/
 225 static s32 ixgbe_write_posted_mbx(struct ixgbe_hw *hw, u32 *msg, u16 size,
 226                            u16 mbx_id)
 227 {
 228         struct ixgbe_mbx_info *mbx = &hw->mbx;
 229         s32 ret_val = IXGBE_ERR_MBX;
 230
 231         /* exit if either we can't write or there isn't a defined timeout */
 232         if (!mbx->ops.write || !mbx->timeout)
 233                 goto out;
 234
 235         /* send msg */
 236         ret_val = mbx->ops.write(hw, msg, size, mbx_id);
 237
 238         /* if msg sent wait until we receive an ack */
 239         if (!ret_val)
 240                 ret_val = ixgbe_poll_for_ack(hw, mbx_id);
 241 out:
 242         return ret_val;
 243 }
 244
 245 static s32 ixgbe_check_for_bit_pf(struct ixgbe_hw *hw, u32 mask, s32 index)
 246 {
 247         u32 mbvficr = IXGBE_READ_REG(hw, IXGBE_MBVFICR(index));
 248         s32 ret_val = IXGBE_ERR_MBX;
 249
 250         if (mbvficr & mask) {
 251                 ret_val = 0;
 252                 IXGBE_WRITE_REG(hw, IXGBE_MBVFICR(index), mask);
 253         }
 254
 255         return ret_val;
 256 }
 257
 258 /**
 259  *  ixgbe_check_for_msg_pf - checks to see if the VF has sent mail
 260  *  @hw: pointer to the HW structure
 261  *  @vf_number: the VF index
 262  *
 263  *  returns SUCCESS if the VF has set the Status bit or else ERR_MBX
 264  **/
 265 static s32 ixgbe_check_for_msg_pf(struct ixgbe_hw *hw, u16 vf_number)
 266 {
 267         s32 ret_val = IXGBE_ERR_MBX;
 268         s32 index = IXGBE_MBVFICR_INDEX(vf_number);
 269         u32 vf_bit = vf_number % 16;
 270
 271         if (!ixgbe_check_for_bit_pf(hw, IXGBE_MBVFICR_VFREQ_VF1 << vf_bit,
 272                                     index)) {
 273                 ret_val = 0;
 274                 hw->mbx.stats.reqs++;
 275         }
 276
 277         return ret_val;
 278 }
 279
 280 /**
 281  *  ixgbe_check_for_ack_pf - checks to see if the VF has ACKed
 282  *  @hw: pointer to the HW structure
 283  *  @vf_number: the VF index
 284  *
 285  *  returns SUCCESS if the VF has set the Status bit or else ERR_MBX
 286  **/
 287 static s32 ixgbe_check_for_ack_pf(struct ixgbe_hw *hw, u16 vf_number)
 288 {
 289         s32 ret_val = IXGBE_ERR_MBX;
 290         s32 index = IXGBE_MBVFICR_INDEX(vf_number);
 291         u32 vf_bit = vf_number % 16;
 292
 293         if (!ixgbe_check_for_bit_pf(hw, IXGBE_MBVFICR_VFACK_VF1 << vf_bit,
 294                                     index)) {
 295                 ret_val = 0;
 296                 hw->mbx.stats.acks++;
 297         }
 298
 299         return ret_val;
 300 }
 301
 302 /**
 303  *  ixgbe_check_for_rst_pf - checks to see if the VF has reset
 304  *  @hw: pointer to the HW structure
 305  *  @vf_number: the VF index
 306  *
 307  *  returns SUCCESS if the VF has set the Status bit or else ERR_MBX
 308  **/
 309 static s32 ixgbe_check_for_rst_pf(struct ixgbe_hw *hw, u16 vf_number)
 310 {
 311         u32 reg_offset = (vf_number < 32) ? 0 : 1;
 312         u32 vf_shift = vf_number % 32;
 313         u32 vflre = 0;
 314         s32 ret_val = IXGBE_ERR_MBX;
 315
 316         switch (hw->mac.type) {
 317         case ixgbe_mac_82599EB:
 318                 vflre = IXGBE_READ_REG(hw, IXGBE_VFLRE(reg_offset));
 319                 break;
 320         case ixgbe_mac_X540:
 321                 vflre = IXGBE_READ_REG(hw, IXGBE_VFLREC(reg_offset));
 322                 break;
 323         default:
 324                 break;
 325         }
 326
 327         if (vflre & (1 << vf_shift)) {
 328                 ret_val = 0;
 329                 IXGBE_WRITE_REG(hw, IXGBE_VFLREC(reg_offset), (1 << vf_shift));
 330                 hw->mbx.stats.rsts++;
 331         }
 332
 333         return ret_val;
 334 }
 335
 336 /**
 337  *  ixgbe_obtain_mbx_lock_pf - obtain mailbox lock
 338  *  @hw: pointer to the HW structure
 339  *  @vf_number: the VF index
 340  *
 341  *  return SUCCESS if we obtained the mailbox lock
 342  **/
 343 static s32 ixgbe_obtain_mbx_lock_pf(struct ixgbe_hw *hw, u16 vf_number)
 344 {
 345         s32 ret_val = IXGBE_ERR_MBX;
 346         u32 p2v_mailbox;
 347
 348         /* Take ownership of the buffer */
 349         IXGBE_WRITE_REG(hw, IXGBE_PFMAILBOX(vf_number), IXGBE_PFMAILBOX_PFU);
 350
 351         /* reserve mailbox for vf use */
 352         p2v_mailbox = IXGBE_READ_REG(hw, IXGBE_PFMAILBOX(vf_number));
 353         if (p2v_mailbox & IXGBE_PFMAILBOX_PFU)
 354                 ret_val = 0;
 355
 356         return ret_val;
 357 }
 358
 359 /**
 360  *  ixgbe_write_mbx_pf - Places a message in the mailbox
 361  *  @hw: pointer to the HW structure
 362  *  @msg: The message buffer
 363  *  @size: Length of buffer
 364  *  @vf_number: the VF index
 365  *
 366  *  returns SUCCESS if it successfully copied message into the buffer
 367  **/
 368 static s32 ixgbe_write_mbx_pf(struct ixgbe_hw *hw, u32 *msg, u16 size,
 369                               u16 vf_number)
 370 {
 371         s32 ret_val;
 372         u16 i;
 373
 374         /* lock the mailbox to prevent pf/vf race condition */
 375         ret_val = ixgbe_obtain_mbx_lock_pf(hw, vf_number);
 376         if (ret_val)
 377                 goto out_no_write;
 378
 379         /* flush msg and acks as we are overwriting the message buffer */
 380         ixgbe_check_for_msg_pf(hw, vf_number);
 381         ixgbe_check_for_ack_pf(hw, vf_number);
 382
 383         /* copy the caller specified message to the mailbox memory buffer */
 384         for (i = 0; i < size; i++)
 385                 IXGBE_WRITE_REG_ARRAY(hw, IXGBE_PFMBMEM(vf_number), i, msg[i]);
 386
 387         /* Interrupt VF to tell it a message has been sent and release buffer*/
 388         IXGBE_WRITE_REG(hw, IXGBE_PFMAILBOX(vf_number), IXGBE_PFMAILBOX_STS);
 389
 390         /* update stats */
 391         hw->mbx.stats.msgs_tx++;
 392
 393 out_no_write:
 394         return ret_val;
 395
 396 }
 397
 398 /**
 399  *  ixgbe_read_mbx_pf - Read a message from the mailbox
 400  *  @hw: pointer to the HW structure
 401  *  @msg: The message buffer
 402  *  @size: Length of buffer
 403  *  @vf_number: the VF index
 404  *
 405  *  This function copies a message from the mailbox buffer to the caller's
 406  *  memory buffer.  The presumption is that the caller knows that there was
 407  *  a message due to a VF request so no polling for message is needed.
 408  **/
 409 static s32 ixgbe_read_mbx_pf(struct ixgbe_hw *hw, u32 *msg, u16 size,
 410                              u16 vf_number)
 411 {
 412         s32 ret_val;
 413         u16 i;
 414
 415         /* lock the mailbox to prevent pf/vf race condition */
 416         ret_val = ixgbe_obtain_mbx_lock_pf(hw, vf_number);
 417         if (ret_val)
 418                 goto out_no_read;
 419
 420         /* copy the message to the mailbox memory buffer */
 421         for (i = 0; i < size; i++)
 422                 msg[i] = IXGBE_READ_REG_ARRAY(hw, IXGBE_PFMBMEM(vf_number), i);
 423
 424         /* Acknowledge the message and release buffer */
 425         IXGBE_WRITE_REG(hw, IXGBE_PFMAILBOX(vf_number), IXGBE_PFMAILBOX_ACK);
 426
 427         /* update stats */
 428         hw->mbx.stats.msgs_rx++;
 429
 430 out_no_read:
 431         return ret_val;
 432 }
 433
 434 #ifdef CONFIG_PCI_IOV
 435 /**
 436  *  ixgbe_init_mbx_params_pf - set initial values for pf mailbox
 437  *  @hw: pointer to the HW structure
 438  *
 439  *  Initializes the hw->mbx struct to correct values for pf mailbox
 440  */
 441 void ixgbe_init_mbx_params_pf(struct ixgbe_hw *hw)
 442 {
 443         struct ixgbe_mbx_info *mbx = &hw->mbx;
 444
 445         if (hw->mac.type != ixgbe_mac_82599EB &&
 446             hw->mac.type != ixgbe_mac_X540)
 447                 return;
 448
 449         mbx->timeout = 0;
 450         mbx->usec_delay = 0;
 451
 452         mbx->stats.msgs_tx = 0;
 453         mbx->stats.msgs_rx = 0;
 454         mbx->stats.reqs = 0;
 455         mbx->stats.acks = 0;
 456         mbx->stats.rsts = 0;
 457
 458         mbx->size = IXGBE_VFMAILBOX_SIZE;
 459 }
 460 #endif /* CONFIG_PCI_IOV */
 461
 462 struct ixgbe_mbx_operations mbx_ops_generic = {
 463         .read                   = ixgbe_read_mbx_pf,
 464         .write                  = ixgbe_write_mbx_pf,
 465         .read_posted            = ixgbe_read_posted_mbx,
 466         .write_posted           = ixgbe_write_posted_mbx,
 467         .check_for_msg          = ixgbe_check_for_msg_pf,
 468         .check_for_ack          = ixgbe_check_for_ack_pf,
 469         .check_for_rst          = ixgbe_check_for_rst_pf,
 470 };
 471