drivers/net/ethernet/intel/ice/ice_controlq.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /* Copyright (c) 2018, Intel Corporation. */
   3
   4 #include "ice_common.h"
   5
   6 #define ICE_CQ_INIT_REGS(qinfo, prefix)                         \
   7 do {                                                            \
   8         (qinfo)->sq.head = prefix##_ATQH;                       \
   9         (qinfo)->sq.tail = prefix##_ATQT;                       \
  10         (qinfo)->sq.len = prefix##_ATQLEN;                      \
  11         (qinfo)->sq.bah = prefix##_ATQBAH;                      \
  12         (qinfo)->sq.bal = prefix##_ATQBAL;                      \
  13         (qinfo)->sq.len_mask = prefix##_ATQLEN_ATQLEN_M;        \
  14         (qinfo)->sq.len_ena_mask = prefix##_ATQLEN_ATQENABLE_M; \
  15         (qinfo)->sq.len_crit_mask = prefix##_ATQLEN_ATQCRIT_M;  \
  16         (qinfo)->sq.head_mask = prefix##_ATQH_ATQH_M;           \
  17         (qinfo)->rq.head = prefix##_ARQH;                       \
  18         (qinfo)->rq.tail = prefix##_ARQT;                       \
  19         (qinfo)->rq.len = prefix##_ARQLEN;                      \
  20         (qinfo)->rq.bah = prefix##_ARQBAH;                      \
  21         (qinfo)->rq.bal = prefix##_ARQBAL;                      \
  22         (qinfo)->rq.len_mask = prefix##_ARQLEN_ARQLEN_M;        \
  23         (qinfo)->rq.len_ena_mask = prefix##_ARQLEN_ARQENABLE_M; \
  24         (qinfo)->rq.len_crit_mask = prefix##_ARQLEN_ARQCRIT_M;  \
  25         (qinfo)->rq.head_mask = prefix##_ARQH_ARQH_M;           \
  26 } while (0)
  27
  28 /**
  29  * ice_adminq_init_regs - Initialize AdminQ registers
  30  * @hw: pointer to the hardware structure
  31  *
  32  * This assumes the alloc_sq and alloc_rq functions have already been called
  33  */
  34 static void ice_adminq_init_regs(struct ice_hw *hw)
  35 {
  36         struct ice_ctl_q_info *cq = &hw->adminq;
  37
  38         ICE_CQ_INIT_REGS(cq, PF_FW);
  39 }
  40
  41 /**
  42  * ice_mailbox_init_regs - Initialize Mailbox registers
  43  * @hw: pointer to the hardware structure
  44  *
  45  * This assumes the alloc_sq and alloc_rq functions have already been called
  46  */
  47 static void ice_mailbox_init_regs(struct ice_hw *hw)
  48 {
  49         struct ice_ctl_q_info *cq = &hw->mailboxq;
  50
  51         ICE_CQ_INIT_REGS(cq, PF_MBX);
  52 }
  53
  54 /**
  55  * ice_check_sq_alive
  56  * @hw: pointer to the HW struct
  57  * @cq: pointer to the specific Control queue
  58  *
  59  * Returns true if Queue is enabled else false.
  60  */
  61 bool ice_check_sq_alive(struct ice_hw *hw, struct ice_ctl_q_info *cq)
  62 {
  63         /* check both queue-length and queue-enable fields */
  64         if (cq->sq.len && cq->sq.len_mask && cq->sq.len_ena_mask)
  65                 return (rd32(hw, cq->sq.len) & (cq->sq.len_mask |
  66                                                 cq->sq.len_ena_mask)) ==
  67                         (cq->num_sq_entries | cq->sq.len_ena_mask);
  68
  69         return false;
  70 }
  71
  72 /**
  73  * ice_alloc_ctrlq_sq_ring - Allocate Control Transmit Queue (ATQ) rings
  74  * @hw: pointer to the hardware structure
  75  * @cq: pointer to the specific Control queue
  76  */
  77 static enum ice_status
  78 ice_alloc_ctrlq_sq_ring(struct ice_hw *hw, struct ice_ctl_q_info *cq)
  79 {
  80         size_t size = cq->num_sq_entries * sizeof(struct ice_aq_desc);
  81
  82         cq->sq.desc_buf.va = dmam_alloc_coherent(ice_hw_to_dev(hw), size,
  83                                                  &cq->sq.desc_buf.pa,
  84                                                  GFP_KERNEL | __GFP_ZERO);
  85         if (!cq->sq.desc_buf.va)
  86                 return ICE_ERR_NO_MEMORY;
  87         cq->sq.desc_buf.size = size;
  88
  89         cq->sq.cmd_buf = devm_kcalloc(ice_hw_to_dev(hw), cq->num_sq_entries,
  90                                       sizeof(struct ice_sq_cd), GFP_KERNEL);
  91         if (!cq->sq.cmd_buf) {
  92                 dmam_free_coherent(ice_hw_to_dev(hw), cq->sq.desc_buf.size,
  93                                    cq->sq.desc_buf.va, cq->sq.desc_buf.pa);
  94                 cq->sq.desc_buf.va = NULL;
  95                 cq->sq.desc_buf.pa = 0;
  96                 cq->sq.desc_buf.size = 0;
  97                 return ICE_ERR_NO_MEMORY;
  98         }
  99
 100         return 0;
 101 }
 102
 103 /**
 104  * ice_alloc_ctrlq_rq_ring - Allocate Control Receive Queue (ARQ) rings
 105  * @hw: pointer to the hardware structure
 106  * @cq: pointer to the specific Control queue
 107  */
 108 static enum ice_status
 109 ice_alloc_ctrlq_rq_ring(struct ice_hw *hw, struct ice_ctl_q_info *cq)
 110 {
 111         size_t size = cq->num_rq_entries * sizeof(struct ice_aq_desc);
 112
 113         cq->rq.desc_buf.va = dmam_alloc_coherent(ice_hw_to_dev(hw), size,
 114                                                  &cq->rq.desc_buf.pa,
 115                                                  GFP_KERNEL | __GFP_ZERO);
 116         if (!cq->rq.desc_buf.va)
 117                 return ICE_ERR_NO_MEMORY;
 118         cq->rq.desc_buf.size = size;
 119         return 0;
 120 }
 121
 122 /**
 123  * ice_free_cq_ring - Free control queue ring
 124  * @hw: pointer to the hardware structure
 125  * @ring: pointer to the specific control queue ring
 126  *
 127  * This assumes the posted buffers have already been cleaned
 128  * and de-allocated
 129  */
 130 static void ice_free_cq_ring(struct ice_hw *hw, struct ice_ctl_q_ring *ring)
 131 {
 132         dmam_free_coherent(ice_hw_to_dev(hw), ring->desc_buf.size,
 133                            ring->desc_buf.va, ring->desc_buf.pa);
 134         ring->desc_buf.va = NULL;
 135         ring->desc_buf.pa = 0;
 136         ring->desc_buf.size = 0;
 137 }
 138
 139 /**
 140  * ice_alloc_rq_bufs - Allocate pre-posted buffers for the ARQ
 141  * @hw: pointer to the hardware structure
 142  * @cq: pointer to the specific Control queue
 143  */
 144 static enum ice_status
 145 ice_alloc_rq_bufs(struct ice_hw *hw, struct ice_ctl_q_info *cq)
 146 {
 147         int i;
 148
 149         /* We'll be allocating the buffer info memory first, then we can
 150          * allocate the mapped buffers for the event processing
 151          */
 152         cq->rq.dma_head = devm_kcalloc(ice_hw_to_dev(hw), cq->num_rq_entries,
 153                                        sizeof(cq->rq.desc_buf), GFP_KERNEL);
 154         if (!cq->rq.dma_head)
 155                 return ICE_ERR_NO_MEMORY;
 156         cq->rq.r.rq_bi = (struct ice_dma_mem *)cq->rq.dma_head;
 157
 158         /* allocate the mapped buffers */
 159         for (i = 0; i < cq->num_rq_entries; i++) {
 160                 struct ice_aq_desc *desc;
 161                 struct ice_dma_mem *bi;
 162
 163                 bi = &cq->rq.r.rq_bi[i];
 164                 bi->va = dmam_alloc_coherent(ice_hw_to_dev(hw),
 165                                              cq->rq_buf_size, &bi->pa,
 166                                              GFP_KERNEL | __GFP_ZERO);
 167                 if (!bi->va)
 168                         goto unwind_alloc_rq_bufs;
 169                 bi->size = cq->rq_buf_size;
 170
 171                 /* now configure the descriptors for use */
 172                 desc = ICE_CTL_Q_DESC(cq->rq, i);
 173
 174                 desc->flags = cpu_to_le16(ICE_AQ_FLAG_BUF);
 175                 if (cq->rq_buf_size > ICE_AQ_LG_BUF)
 176                         desc->flags |= cpu_to_le16(ICE_AQ_FLAG_LB);
 177                 desc->opcode = 0;
 178                 /* This is in accordance with Admin queue design, there is no
 179                  * register for buffer size configuration
 180                  */
 181                 desc->datalen = cpu_to_le16(bi->size);
 182                 desc->retval = 0;
 183                 desc->cookie_high = 0;
 184                 desc->cookie_low = 0;
 185                 desc->params.generic.addr_high =
 186                         cpu_to_le32(upper_32_bits(bi->pa));
 187                 desc->params.generic.addr_low =
 188                         cpu_to_le32(lower_32_bits(bi->pa));
 189                 desc->params.generic.param0 = 0;
 190                 desc->params.generic.param1 = 0;
 191         }
 192         return 0;
 193
 194 unwind_alloc_rq_bufs:
 195         /* don't try to free the one that failed... */
 196         i--;
 197         for (; i >= 0; i--) {
 198                 dmam_free_coherent(ice_hw_to_dev(hw), cq->rq.r.rq_bi[i].size,
 199                                    cq->rq.r.rq_bi[i].va, cq->rq.r.rq_bi[i].pa);
 200                 cq->rq.r.rq_bi[i].va = NULL;
 201                 cq->rq.r.rq_bi[i].pa = 0;
 202                 cq->rq.r.rq_bi[i].size = 0;
 203         }
 204         cq->rq.r.rq_bi = NULL;
 205         devm_kfree(ice_hw_to_dev(hw), cq->rq.dma_head);
 206         cq->rq.dma_head = NULL;
 207
 208         return ICE_ERR_NO_MEMORY;
 209 }
 210
 211 /**
 212  * ice_alloc_sq_bufs - Allocate empty buffer structs for the ATQ
 213  * @hw: pointer to the hardware structure
 214  * @cq: pointer to the specific Control queue
 215  */
 216 static enum ice_status
 217 ice_alloc_sq_bufs(struct ice_hw *hw, struct ice_ctl_q_info *cq)
 218 {
 219         int i;
 220
 221         /* No mapped memory needed yet, just the buffer info structures */
 222         cq->sq.dma_head = devm_kcalloc(ice_hw_to_dev(hw), cq->num_sq_entries,
 223                                        sizeof(cq->sq.desc_buf), GFP_KERNEL);
 224         if (!cq->sq.dma_head)
 225                 return ICE_ERR_NO_MEMORY;
 226         cq->sq.r.sq_bi = (struct ice_dma_mem *)cq->sq.dma_head;
 227
 228         /* allocate the mapped buffers */
 229         for (i = 0; i < cq->num_sq_entries; i++) {
 230                 struct ice_dma_mem *bi;
 231
 232                 bi = &cq->sq.r.sq_bi[i];
 233                 bi->va = dmam_alloc_coherent(ice_hw_to_dev(hw),
 234                                              cq->sq_buf_size, &bi->pa,
 235                                              GFP_KERNEL | __GFP_ZERO);
 236                 if (!bi->va)
 237                         goto unwind_alloc_sq_bufs;
 238                 bi->size = cq->sq_buf_size;
 239         }
 240         return 0;
 241
 242 unwind_alloc_sq_bufs:
 243         /* don't try to free the one that failed... */
 244         i--;
 245         for (; i >= 0; i--) {
 246                 dmam_free_coherent(ice_hw_to_dev(hw), cq->sq.r.sq_bi[i].size,
 247                                    cq->sq.r.sq_bi[i].va, cq->sq.r.sq_bi[i].pa);
 248                 cq->sq.r.sq_bi[i].va = NULL;
 249                 cq->sq.r.sq_bi[i].pa = 0;
 250                 cq->sq.r.sq_bi[i].size = 0;
 251         }
 252         cq->sq.r.sq_bi = NULL;
 253         devm_kfree(ice_hw_to_dev(hw), cq->sq.dma_head);
 254         cq->sq.dma_head = NULL;
 255
 256         return ICE_ERR_NO_MEMORY;
 257 }
 258
 259 static enum ice_status
 260 ice_cfg_cq_regs(struct ice_hw *hw, struct ice_ctl_q_ring *ring, u16 num_entries)
 261 {
 262         /* Clear Head and Tail */
 263         wr32(hw, ring->head, 0);
 264         wr32(hw, ring->tail, 0);
 265
 266         /* set starting point */
 267         wr32(hw, ring->len, (num_entries | ring->len_ena_mask));
 268         wr32(hw, ring->bal, lower_32_bits(ring->desc_buf.pa));
 269         wr32(hw, ring->bah, upper_32_bits(ring->desc_buf.pa));
 270
 271         /* Check one register to verify that config was applied */
 272         if (rd32(hw, ring->bal) != lower_32_bits(ring->desc_buf.pa))
 273                 return ICE_ERR_AQ_ERROR;
 274
 275         return 0;
 276 }
 277
 278 /**
 279  * ice_cfg_sq_regs - configure Control ATQ registers
 280  * @hw: pointer to the hardware structure
 281  * @cq: pointer to the specific Control queue
 282  *
 283  * Configure base address and length registers for the transmit queue
 284  */
 285 static enum ice_status
 286 ice_cfg_sq_regs(struct ice_hw *hw, struct ice_ctl_q_info *cq)
 287 {
 288         return ice_cfg_cq_regs(hw, &cq->sq, cq->num_sq_entries);
 289 }
 290
 291 /**
 292  * ice_cfg_rq_regs - configure Control ARQ register
 293  * @hw: pointer to the hardware structure
 294  * @cq: pointer to the specific Control queue
 295  *
 296  * Configure base address and length registers for the receive (event queue)
 297  */
 298 static enum ice_status
 299 ice_cfg_rq_regs(struct ice_hw *hw, struct ice_ctl_q_info *cq)
 300 {
 301         enum ice_status status;
 302
 303         status = ice_cfg_cq_regs(hw, &cq->rq, cq->num_rq_entries);
 304         if (status)
 305                 return status;
 306
 307         /* Update tail in the HW to post pre-allocated buffers */
 308         wr32(hw, cq->rq.tail, (u32)(cq->num_rq_entries - 1));
 309
 310         return 0;
 311 }
 312
 313 #define ICE_FREE_CQ_BUFS(hw, qi, ring)                                  \
 314 do {                                                                    \
 315         /* free descriptors */                                          \
 316         if ((qi)->ring.r.ring##_bi) {                                   \
 317                 int i;                                                  \
 318                                                                         \
 319                 for (i = 0; i < (qi)->num_##ring##_entries; i++)        \
 320                         if ((qi)->ring.r.ring##_bi[i].pa) {             \
 321                                 dmam_free_coherent(ice_hw_to_dev(hw),   \
 322                                         (qi)->ring.r.ring##_bi[i].size, \
 323                                         (qi)->ring.r.ring##_bi[i].va,   \
 324                                         (qi)->ring.r.ring##_bi[i].pa);  \
 325                                         (qi)->ring.r.ring##_bi[i].va = NULL;\
 326                                         (qi)->ring.r.ring##_bi[i].pa = 0;\
 327                                         (qi)->ring.r.ring##_bi[i].size = 0;\
 328                 }                                                       \
 329         }                                                               \
 330         /* free the buffer info list */                                 \
 331         if ((qi)->ring.cmd_buf)                                         \
 332                 devm_kfree(ice_hw_to_dev(hw), (qi)->ring.cmd_buf);      \
 333         /* free DMA head */                                             \
 334         devm_kfree(ice_hw_to_dev(hw), (qi)->ring.dma_head);             \
 335 } while (0)
 336
 337 /**
 338  * ice_init_sq - main initialization routine for Control ATQ
 339  * @hw: pointer to the hardware structure
 340  * @cq: pointer to the specific Control queue
 341  *
 342  * This is the main initialization routine for the Control Send Queue
 343  * Prior to calling this function, the driver *MUST* set the following fields
 344  * in the cq->structure:
 345  *     - cq->num_sq_entries
 346  *     - cq->sq_buf_size
 347  *
 348  * Do *NOT* hold the lock when calling this as the memory allocation routines
 349  * called are not going to be atomic context safe
 350  */
 351 static enum ice_status ice_init_sq(struct ice_hw *hw, struct ice_ctl_q_info *cq)
 352 {
 353         enum ice_status ret_code;
 354
 355         if (cq->sq.count > 0) {
 356                 /* queue already initialized */
 357                 ret_code = ICE_ERR_NOT_READY;
 358                 goto init_ctrlq_exit;
 359         }
 360
 361         /* verify input for valid configuration */
 362         if (!cq->num_sq_entries || !cq->sq_buf_size) {
 363                 ret_code = ICE_ERR_CFG;
 364                 goto init_ctrlq_exit;
 365         }
 366
 367         cq->sq.next_to_use = 0;
 368         cq->sq.next_to_clean = 0;
 369
 370         /* allocate the ring memory */
 371         ret_code = ice_alloc_ctrlq_sq_ring(hw, cq);
 372         if (ret_code)
 373                 goto init_ctrlq_exit;
 374
 375         /* allocate buffers in the rings */
 376         ret_code = ice_alloc_sq_bufs(hw, cq);
 377         if (ret_code)
 378                 goto init_ctrlq_free_rings;
 379
 380         /* initialize base registers */
 381         ret_code = ice_cfg_sq_regs(hw, cq);
 382         if (ret_code)
 383                 goto init_ctrlq_free_rings;
 384
 385         /* success! */
 386         cq->sq.count = cq->num_sq_entries;
 387         goto init_ctrlq_exit;
 388
 389 init_ctrlq_free_rings:
 390         ICE_FREE_CQ_BUFS(hw, cq, sq);
 391         ice_free_cq_ring(hw, &cq->sq);
 392
 393 init_ctrlq_exit:
 394         return ret_code;
 395 }
 396
 397 /**
 398  * ice_init_rq - initialize ARQ
 399  * @hw: pointer to the hardware structure
 400  * @cq: pointer to the specific Control queue
 401  *
 402  * The main initialization routine for the Admin Receive (Event) Queue.
 403  * Prior to calling this function, the driver *MUST* set the following fields
 404  * in the cq->structure:
 405  *     - cq->num_rq_entries
 406  *     - cq->rq_buf_size
 407  *
 408  * Do *NOT* hold the lock when calling this as the memory allocation routines
 409  * called are not going to be atomic context safe
 410  */
 411 static enum ice_status ice_init_rq(struct ice_hw *hw, struct ice_ctl_q_info *cq)
 412 {
 413         enum ice_status ret_code;
 414
 415         if (cq->rq.count > 0) {
 416                 /* queue already initialized */
 417                 ret_code = ICE_ERR_NOT_READY;
 418                 goto init_ctrlq_exit;
 419         }
 420
 421         /* verify input for valid configuration */
 422         if (!cq->num_rq_entries || !cq->rq_buf_size) {
 423                 ret_code = ICE_ERR_CFG;
 424                 goto init_ctrlq_exit;
 425         }
 426
 427         cq->rq.next_to_use = 0;
 428         cq->rq.next_to_clean = 0;
 429
 430         /* allocate the ring memory */
 431         ret_code = ice_alloc_ctrlq_rq_ring(hw, cq);
 432         if (ret_code)
 433                 goto init_ctrlq_exit;
 434
 435         /* allocate buffers in the rings */
 436         ret_code = ice_alloc_rq_bufs(hw, cq);
 437         if (ret_code)
 438                 goto init_ctrlq_free_rings;
 439
 440         /* initialize base registers */
 441         ret_code = ice_cfg_rq_regs(hw, cq);
 442         if (ret_code)
 443                 goto init_ctrlq_free_rings;
 444
 445         /* success! */
 446         cq->rq.count = cq->num_rq_entries;
 447         goto init_ctrlq_exit;
 448
 449 init_ctrlq_free_rings:
 450         ICE_FREE_CQ_BUFS(hw, cq, rq);
 451         ice_free_cq_ring(hw, &cq->rq);
 452
 453 init_ctrlq_exit:
 454         return ret_code;
 455 }
 456
 457 /**
 458  * ice_shutdown_sq - shutdown the Control ATQ
 459  * @hw: pointer to the hardware structure
 460  * @cq: pointer to the specific Control queue
 461  *
 462  * The main shutdown routine for the Control Transmit Queue
 463  */
 464 static enum ice_status
 465 ice_shutdown_sq(struct ice_hw *hw, struct ice_ctl_q_info *cq)
 466 {
 467         enum ice_status ret_code = 0;
 468
 469         mutex_lock(&cq->sq_lock);
 470
 471         if (!cq->sq.count) {
 472                 ret_code = ICE_ERR_NOT_READY;
 473                 goto shutdown_sq_out;
 474         }
 475
 476         /* Stop firmware AdminQ processing */
 477         wr32(hw, cq->sq.head, 0);
 478         wr32(hw, cq->sq.tail, 0);
 479         wr32(hw, cq->sq.len, 0);
 480         wr32(hw, cq->sq.bal, 0);
 481         wr32(hw, cq->sq.bah, 0);
 482
 483         cq->sq.count = 0;       /* to indicate uninitialized queue */
 484
 485         /* free ring buffers and the ring itself */
 486         ICE_FREE_CQ_BUFS(hw, cq, sq);
 487         ice_free_cq_ring(hw, &cq->sq);
 488
 489 shutdown_sq_out:
 490         mutex_unlock(&cq->sq_lock);
 491         return ret_code;
 492 }
 493
 494 /**
 495  * ice_aq_ver_check - Check the reported AQ API version.
 496  * @hw: pointer to the hardware structure
 497  *
 498  * Checks if the driver should load on a given AQ API version.
 499  *
 500  * Return: 'true' iff the driver should attempt to load. 'false' otherwise.
 501  */
 502 static bool ice_aq_ver_check(struct ice_hw *hw)
 503 {
 504         if (hw->api_maj_ver > EXP_FW_API_VER_MAJOR) {
 505                 /* Major API version is newer than expected, don't load */
 506                 dev_warn(ice_hw_to_dev(hw),
 507                          "The driver for the device stopped because the NVM image is newer than expected. You must install the most recent version of the network driver.\n");
 508                 return false;
 509         } else if (hw->api_maj_ver == EXP_FW_API_VER_MAJOR) {
 510                 if (hw->api_min_ver > (EXP_FW_API_VER_MINOR + 2))
 511                         dev_info(ice_hw_to_dev(hw),
 512                                  "The driver for the device detected a newer version of the NVM image than expected. Please install the most recent version of the network driver.\n");
 513                 else if ((hw->api_min_ver + 2) < EXP_FW_API_VER_MINOR)
 514                         dev_info(ice_hw_to_dev(hw),
 515                                  "The driver for the device detected an older version of the NVM image than expected. Please update the NVM image.\n");
 516         } else {
 517                 /* Major API version is older than expected, log a warning */
 518                 dev_info(ice_hw_to_dev(hw),
 519                          "The driver for the device detected an older version of the NVM image than expected. Please update the NVM image.\n");
 520         }
 521         return true;
 522 }
 523
 524 /**
 525  * ice_shutdown_rq - shutdown Control ARQ
 526  * @hw: pointer to the hardware structure
 527  * @cq: pointer to the specific Control queue
 528  *
 529  * The main shutdown routine for the Control Receive Queue
 530  */
 531 static enum ice_status
 532 ice_shutdown_rq(struct ice_hw *hw, struct ice_ctl_q_info *cq)
 533 {
 534         enum ice_status ret_code = 0;
 535
 536         mutex_lock(&cq->rq_lock);
 537
 538         if (!cq->rq.count) {
 539                 ret_code = ICE_ERR_NOT_READY;
 540                 goto shutdown_rq_out;
 541         }
 542
 543         /* Stop Control Queue processing */
 544         wr32(hw, cq->rq.head, 0);
 545         wr32(hw, cq->rq.tail, 0);
 546         wr32(hw, cq->rq.len, 0);
 547         wr32(hw, cq->rq.bal, 0);
 548         wr32(hw, cq->rq.bah, 0);
 549
 550         /* set rq.count to 0 to indicate uninitialized queue */
 551         cq->rq.count = 0;
 552
 553         /* free ring buffers and the ring itself */
 554         ICE_FREE_CQ_BUFS(hw, cq, rq);
 555         ice_free_cq_ring(hw, &cq->rq);
 556
 557 shutdown_rq_out:
 558         mutex_unlock(&cq->rq_lock);
 559         return ret_code;
 560 }
 561
 562 /**
 563  * ice_init_check_adminq - Check version for Admin Queue to know if its alive
 564  * @hw: pointer to the hardware structure
 565  */
 566 static enum ice_status ice_init_check_adminq(struct ice_hw *hw)
 567 {
 568         struct ice_ctl_q_info *cq = &hw->adminq;
 569         enum ice_status status;
 570
 571         status = ice_aq_get_fw_ver(hw, NULL);
 572         if (status)
 573                 goto init_ctrlq_free_rq;
 574
 575         if (!ice_aq_ver_check(hw)) {
 576                 status = ICE_ERR_FW_API_VER;
 577                 goto init_ctrlq_free_rq;
 578         }
 579
 580         return 0;
 581
 582 init_ctrlq_free_rq:
 583         ice_shutdown_rq(hw, cq);
 584         ice_shutdown_sq(hw, cq);
 585         return status;
 586 }
 587
 588 /**
 589  * ice_init_ctrlq - main initialization routine for any control Queue
 590  * @hw: pointer to the hardware structure
 591  * @q_type: specific Control queue type
 592  *
 593  * Prior to calling this function, the driver *MUST* set the following fields
 594  * in the cq->structure:
 595  *     - cq->num_sq_entries
 596  *     - cq->num_rq_entries
 597  *     - cq->rq_buf_size
 598  *     - cq->sq_buf_size
 599  *
 600  * NOTE: this function does not initialize the controlq locks
 601  */
 602 static enum ice_status ice_init_ctrlq(struct ice_hw *hw, enum ice_ctl_q q_type)
 603 {
 604         struct ice_ctl_q_info *cq;
 605         enum ice_status ret_code;
 606
 607         switch (q_type) {
 608         case ICE_CTL_Q_ADMIN:
 609                 ice_adminq_init_regs(hw);
 610                 cq = &hw->adminq;
 611                 break;
 612         case ICE_CTL_Q_MAILBOX:
 613                 ice_mailbox_init_regs(hw);
 614                 cq = &hw->mailboxq;
 615                 break;
 616         default:
 617                 return ICE_ERR_PARAM;
 618         }
 619         cq->qtype = q_type;
 620
 621         /* verify input for valid configuration */
 622         if (!cq->num_rq_entries || !cq->num_sq_entries ||
 623             !cq->rq_buf_size || !cq->sq_buf_size) {
 624                 return ICE_ERR_CFG;
 625         }
 626
 627         /* setup SQ command write back timeout */
 628         cq->sq_cmd_timeout = ICE_CTL_Q_SQ_CMD_TIMEOUT;
 629
 630         /* allocate the ATQ */
 631         ret_code = ice_init_sq(hw, cq);
 632         if (ret_code)
 633                 return ret_code;
 634
 635         /* allocate the ARQ */
 636         ret_code = ice_init_rq(hw, cq);
 637         if (ret_code)
 638                 goto init_ctrlq_free_sq;
 639
 640         /* success! */
 641         return 0;
 642
 643 init_ctrlq_free_sq:
 644         ice_shutdown_sq(hw, cq);
 645         return ret_code;
 646 }
 647
 648 /**
 649  * ice_shutdown_ctrlq - shutdown routine for any control queue
 650  * @hw: pointer to the hardware structure
 651  * @q_type: specific Control queue type
 652  *
 653  * NOTE: this function does not destroy the control queue locks.
 654  */
 655 static void ice_shutdown_ctrlq(struct ice_hw *hw, enum ice_ctl_q q_type)
 656 {
 657         struct ice_ctl_q_info *cq;
 658
 659         switch (q_type) {
 660         case ICE_CTL_Q_ADMIN:
 661                 cq = &hw->adminq;
 662                 if (ice_check_sq_alive(hw, cq))
 663                         ice_aq_q_shutdown(hw, true);
 664                 break;
 665         case ICE_CTL_Q_MAILBOX:
 666                 cq = &hw->mailboxq;
 667                 break;
 668         default:
 669                 return;
 670         }
 671
 672         ice_shutdown_sq(hw, cq);
 673         ice_shutdown_rq(hw, cq);
 674 }
 675
 676 /**
 677  * ice_shutdown_all_ctrlq - shutdown routine for all control queues
 678  * @hw: pointer to the hardware structure
 679  *
 680  * NOTE: this function does not destroy the control queue locks. The driver
 681  * may call this at runtime to shutdown and later restart control queues, such
 682  * as in response to a reset event.
 683  */
 684 void ice_shutdown_all_ctrlq(struct ice_hw *hw)
 685 {
 686         /* Shutdown FW admin queue */
 687         ice_shutdown_ctrlq(hw, ICE_CTL_Q_ADMIN);
 688         /* Shutdown PF-VF Mailbox */
 689         ice_shutdown_ctrlq(hw, ICE_CTL_Q_MAILBOX);
 690 }
 691
 692 /**
 693  * ice_init_all_ctrlq - main initialization routine for all control queues
 694  * @hw: pointer to the hardware structure
 695  *
 696  * Prior to calling this function, the driver MUST* set the following fields
 697  * in the cq->structure for all control queues:
 698  *     - cq->num_sq_entries
 699  *     - cq->num_rq_entries
 700  *     - cq->rq_buf_size
 701  *     - cq->sq_buf_size
 702  *
 703  * NOTE: this function does not initialize the controlq locks.
 704  */
 705 enum ice_status ice_init_all_ctrlq(struct ice_hw *hw)
 706 {
 707         enum ice_status status;
 708         u32 retry = 0;
 709
 710         /* Init FW admin queue */
 711         do {
 712                 status = ice_init_ctrlq(hw, ICE_CTL_Q_ADMIN);
 713                 if (status)
 714                         return status;
 715
 716                 status = ice_init_check_adminq(hw);
 717                 if (status != ICE_ERR_AQ_FW_CRITICAL)
 718                         break;
 719
 720                 ice_debug(hw, ICE_DBG_AQ_MSG, "Retry Admin Queue init due to FW critical error\n");
 721                 ice_shutdown_ctrlq(hw, ICE_CTL_Q_ADMIN);
 722                 msleep(ICE_CTL_Q_ADMIN_INIT_MSEC);
 723         } while (retry++ < ICE_CTL_Q_ADMIN_INIT_TIMEOUT);
 724
 725         if (status)
 726                 return status;
 727         /* Init Mailbox queue */
 728         return ice_init_ctrlq(hw, ICE_CTL_Q_MAILBOX);
 729 }
 730
 731 /**
 732  * ice_init_ctrlq_locks - Initialize locks for a control queue
 733  * @cq: pointer to the control queue
 734  *
 735  * Initializes the send and receive queue locks for a given control queue.
 736  */
 737 static void ice_init_ctrlq_locks(struct ice_ctl_q_info *cq)
 738 {
 739         mutex_init(&cq->sq_lock);
 740         mutex_init(&cq->rq_lock);
 741 }
 742
 743 /**
 744  * ice_create_all_ctrlq - main initialization routine for all control queues
 745  * @hw: pointer to the hardware structure
 746  *
 747  * Prior to calling this function, the driver *MUST* set the following fields
 748  * in the cq->structure for all control queues:
 749  *     - cq->num_sq_entries
 750  *     - cq->num_rq_entries
 751  *     - cq->rq_buf_size
 752  *     - cq->sq_buf_size
 753  *
 754  * This function creates all the control queue locks and then calls
 755  * ice_init_all_ctrlq. It should be called once during driver load. If the
 756  * driver needs to re-initialize control queues at run time it should call
 757  * ice_init_all_ctrlq instead.
 758  */
 759 enum ice_status ice_create_all_ctrlq(struct ice_hw *hw)
 760 {
 761         ice_init_ctrlq_locks(&hw->adminq);
 762         ice_init_ctrlq_locks(&hw->mailboxq);
 763
 764         return ice_init_all_ctrlq(hw);
 765 }
 766
 767 /**
 768  * ice_destroy_ctrlq_locks - Destroy locks for a control queue
 769  * @cq: pointer to the control queue
 770  *
 771  * Destroys the send and receive queue locks for a given control queue.
 772  */
 773 static void ice_destroy_ctrlq_locks(struct ice_ctl_q_info *cq)
 774 {
 775         mutex_destroy(&cq->sq_lock);
 776         mutex_destroy(&cq->rq_lock);
 777 }
 778
 779 /**
 780  * ice_destroy_all_ctrlq - exit routine for all control queues
 781  * @hw: pointer to the hardware structure
 782  *
 783  * This function shuts down all the control queues and then destroys the
 784  * control queue locks. It should be called once during driver unload. The
 785  * driver should call ice_shutdown_all_ctrlq if it needs to shut down and
 786  * reinitialize control queues, such as in response to a reset event.
 787  */
 788 void ice_destroy_all_ctrlq(struct ice_hw *hw)
 789 {
 790         /* shut down all the control queues first */
 791         ice_shutdown_all_ctrlq(hw);
 792
 793         ice_destroy_ctrlq_locks(&hw->adminq);
 794         ice_destroy_ctrlq_locks(&hw->mailboxq);
 795 }
 796
 797 /**
 798  * ice_clean_sq - cleans Admin send queue (ATQ)
 799  * @hw: pointer to the hardware structure
 800  * @cq: pointer to the specific Control queue
 801  *
 802  * returns the number of free desc
 803  */
 804 static u16 ice_clean_sq(struct ice_hw *hw, struct ice_ctl_q_info *cq)
 805 {
 806         struct ice_ctl_q_ring *sq = &cq->sq;
 807         u16 ntc = sq->next_to_clean;
 808         struct ice_sq_cd *details;
 809         struct ice_aq_desc *desc;
 810
 811         desc = ICE_CTL_Q_DESC(*sq, ntc);
 812         details = ICE_CTL_Q_DETAILS(*sq, ntc);
 813
 814         while (rd32(hw, cq->sq.head) != ntc) {
 815                 ice_debug(hw, ICE_DBG_AQ_MSG, "ntc %d head %d.\n", ntc, rd32(hw, cq->sq.head));
 816                 memset(desc, 0, sizeof(*desc));
 817                 memset(details, 0, sizeof(*details));
 818                 ntc++;
 819                 if (ntc == sq->count)
 820                         ntc = 0;
 821                 desc = ICE_CTL_Q_DESC(*sq, ntc);
 822                 details = ICE_CTL_Q_DETAILS(*sq, ntc);
 823         }
 824
 825         sq->next_to_clean = ntc;
 826
 827         return ICE_CTL_Q_DESC_UNUSED(sq);
 828 }
 829
 830 /**
 831  * ice_debug_cq
 832  * @hw: pointer to the hardware structure
 833  * @desc: pointer to control queue descriptor
 834  * @buf: pointer to command buffer
 835  * @buf_len: max length of buf
 836  *
 837  * Dumps debug log about control command with descriptor contents.
 838  */
 839 static void ice_debug_cq(struct ice_hw *hw, void *desc, void *buf, u16 buf_len)
 840 {
 841         struct ice_aq_desc *cq_desc = (struct ice_aq_desc *)desc;
 842         u16 len;
 843
 844         if (!IS_ENABLED(CONFIG_DYNAMIC_DEBUG) &&
 845             !((ICE_DBG_AQ_DESC | ICE_DBG_AQ_DESC_BUF) & hw->debug_mask))
 846                 return;
 847
 848         if (!desc)
 849                 return;
 850
 851         len = le16_to_cpu(cq_desc->datalen);
 852
 853         ice_debug(hw, ICE_DBG_AQ_DESC, "CQ CMD: opcode 0x%04X, flags 0x%04X, datalen 0x%04X, retval 0x%04X\n",
 854                   le16_to_cpu(cq_desc->opcode),
 855                   le16_to_cpu(cq_desc->flags),
 856                   le16_to_cpu(cq_desc->datalen), le16_to_cpu(cq_desc->retval));
 857         ice_debug(hw, ICE_DBG_AQ_DESC, "\tcookie (h,l) 0x%08X 0x%08X\n",
 858                   le32_to_cpu(cq_desc->cookie_high),
 859                   le32_to_cpu(cq_desc->cookie_low));
 860         ice_debug(hw, ICE_DBG_AQ_DESC, "\tparam (0,1)  0x%08X 0x%08X\n",
 861                   le32_to_cpu(cq_desc->params.generic.param0),
 862                   le32_to_cpu(cq_desc->params.generic.param1));
 863         ice_debug(hw, ICE_DBG_AQ_DESC, "\taddr (h,l)   0x%08X 0x%08X\n",
 864                   le32_to_cpu(cq_desc->params.generic.addr_high),
 865                   le32_to_cpu(cq_desc->params.generic.addr_low));
 866         if (buf && cq_desc->datalen != 0) {
 867                 ice_debug(hw, ICE_DBG_AQ_DESC_BUF, "Buffer:\n");
 868                 if (buf_len < len)
 869                         len = buf_len;
 870
 871                 ice_debug_array(hw, ICE_DBG_AQ_DESC_BUF, 16, 1, (u8 *)buf, len);
 872         }
 873 }
 874
 875 /**
 876  * ice_sq_done - check if FW has processed the Admin Send Queue (ATQ)
 877  * @hw: pointer to the HW struct
 878  * @cq: pointer to the specific Control queue
 879  *
 880  * Returns true if the firmware has processed all descriptors on the
 881  * admin send queue. Returns false if there are still requests pending.
 882  */
 883 static bool ice_sq_done(struct ice_hw *hw, struct ice_ctl_q_info *cq)
 884 {
 885         /* AQ designers suggest use of head for better
 886          * timing reliability than DD bit
 887          */
 888         return rd32(hw, cq->sq.head) == cq->sq.next_to_use;
 889 }
 890
 891 /**
 892  * ice_sq_send_cmd - send command to Control Queue (ATQ)
 893  * @hw: pointer to the HW struct
 894  * @cq: pointer to the specific Control queue
 895  * @desc: prefilled descriptor describing the command (non DMA mem)
 896  * @buf: buffer to use for indirect commands (or NULL for direct commands)
 897  * @buf_size: size of buffer for indirect commands (or 0 for direct commands)
 898  * @cd: pointer to command details structure
 899  *
 900  * This is the main send command routine for the ATQ. It runs the queue,
 901  * cleans the queue, etc.
 902  */
 903 enum ice_status
 904 ice_sq_send_cmd(struct ice_hw *hw, struct ice_ctl_q_info *cq,
 905                 struct ice_aq_desc *desc, void *buf, u16 buf_size,
 906                 struct ice_sq_cd *cd)
 907 {
 908         struct ice_dma_mem *dma_buf = NULL;
 909         struct ice_aq_desc *desc_on_ring;
 910         bool cmd_completed = false;
 911         enum ice_status status = 0;
 912         struct ice_sq_cd *details;
 913         u32 total_delay = 0;
 914         u16 retval = 0;
 915         u32 val = 0;
 916
 917         /* if reset is in progress return a soft error */
 918         if (hw->reset_ongoing)
 919                 return ICE_ERR_RESET_ONGOING;
 920         mutex_lock(&cq->sq_lock);
 921
 922         cq->sq_last_status = ICE_AQ_RC_OK;
 923
 924         if (!cq->sq.count) {
 925                 ice_debug(hw, ICE_DBG_AQ_MSG, "Control Send queue not initialized.\n");
 926                 status = ICE_ERR_AQ_EMPTY;
 927                 goto sq_send_command_error;
 928         }
 929
 930         if ((buf && !buf_size) || (!buf && buf_size)) {
 931                 status = ICE_ERR_PARAM;
 932                 goto sq_send_command_error;
 933         }
 934
 935         if (buf) {
 936                 if (buf_size > cq->sq_buf_size) {
 937                         ice_debug(hw, ICE_DBG_AQ_MSG, "Invalid buffer size for Control Send queue: %d.\n",
 938                                   buf_size);
 939                         status = ICE_ERR_INVAL_SIZE;
 940                         goto sq_send_command_error;
 941                 }
 942
 943                 desc->flags |= cpu_to_le16(ICE_AQ_FLAG_BUF);
 944                 if (buf_size > ICE_AQ_LG_BUF)
 945                         desc->flags |= cpu_to_le16(ICE_AQ_FLAG_LB);
 946         }
 947
 948         val = rd32(hw, cq->sq.head);
 949         if (val >= cq->num_sq_entries) {
 950                 ice_debug(hw, ICE_DBG_AQ_MSG, "head overrun at %d in the Control Send Queue ring\n",
 951                           val);
 952                 status = ICE_ERR_AQ_EMPTY;
 953                 goto sq_send_command_error;
 954         }
 955
 956         details = ICE_CTL_Q_DETAILS(cq->sq, cq->sq.next_to_use);
 957         if (cd)
 958                 *details = *cd;
 959         else
 960                 memset(details, 0, sizeof(*details));
 961
 962         /* Call clean and check queue available function to reclaim the
 963          * descriptors that were processed by FW/MBX; the function returns the
 964          * number of desc available. The clean function called here could be
 965          * called in a separate thread in case of asynchronous completions.
 966          */
 967         if (ice_clean_sq(hw, cq) == 0) {
 968                 ice_debug(hw, ICE_DBG_AQ_MSG, "Error: Control Send Queue is full.\n");
 969                 status = ICE_ERR_AQ_FULL;
 970                 goto sq_send_command_error;
 971         }
 972
 973         /* initialize the temp desc pointer with the right desc */
 974         desc_on_ring = ICE_CTL_Q_DESC(cq->sq, cq->sq.next_to_use);
 975
 976         /* if the desc is available copy the temp desc to the right place */
 977         memcpy(desc_on_ring, desc, sizeof(*desc_on_ring));
 978
 979         /* if buf is not NULL assume indirect command */
 980         if (buf) {
 981                 dma_buf = &cq->sq.r.sq_bi[cq->sq.next_to_use];
 982                 /* copy the user buf into the respective DMA buf */
 983                 memcpy(dma_buf->va, buf, buf_size);
 984                 desc_on_ring->datalen = cpu_to_le16(buf_size);
 985
 986                 /* Update the address values in the desc with the pa value
 987                  * for respective buffer
 988                  */
 989                 desc_on_ring->params.generic.addr_high =
 990                         cpu_to_le32(upper_32_bits(dma_buf->pa));
 991                 desc_on_ring->params.generic.addr_low =
 992                         cpu_to_le32(lower_32_bits(dma_buf->pa));
 993         }
 994
 995         /* Debug desc and buffer */
 996         ice_debug(hw, ICE_DBG_AQ_DESC, "ATQ: Control Send queue desc and buffer:\n");
 997
 998         ice_debug_cq(hw, (void *)desc_on_ring, buf, buf_size);
 999
1000         (cq->sq.next_to_use)++;
1001         if (cq->sq.next_to_use == cq->sq.count)
1002                 cq->sq.next_to_use = 0;
1003         wr32(hw, cq->sq.tail, cq->sq.next_to_use);
1004
1005         do {
1006                 if (ice_sq_done(hw, cq))
1007                         break;
1008
1009                 udelay(ICE_CTL_Q_SQ_CMD_USEC);
1010                 total_delay++;
1011         } while (total_delay < cq->sq_cmd_timeout);
1012
1013         /* if ready, copy the desc back to temp */
1014         if (ice_sq_done(hw, cq)) {
1015                 memcpy(desc, desc_on_ring, sizeof(*desc));
1016                 if (buf) {
1017                         /* get returned length to copy */
1018                         u16 copy_size = le16_to_cpu(desc->datalen);
1019
1020                         if (copy_size > buf_size) {
1021                                 ice_debug(hw, ICE_DBG_AQ_MSG, "Return len %d > than buf len %d\n",
1022                                           copy_size, buf_size);
1023                                 status = ICE_ERR_AQ_ERROR;
1024                         } else {
1025                                 memcpy(buf, dma_buf->va, copy_size);
1026                         }
1027                 }
1028                 retval = le16_to_cpu(desc->retval);
1029                 if (retval) {
1030                         ice_debug(hw, ICE_DBG_AQ_MSG, "Control Send Queue command 0x%04X completed with error 0x%X\n",
1031                                   le16_to_cpu(desc->opcode),
1032                                   retval);
1033
1034                         /* strip off FW internal code */
1035                         retval &= 0xff;
1036                 }
1037                 cmd_completed = true;
1038                 if (!status && retval != ICE_AQ_RC_OK)
1039                         status = ICE_ERR_AQ_ERROR;
1040                 cq->sq_last_status = (enum ice_aq_err)retval;
1041         }
1042
1043         ice_debug(hw, ICE_DBG_AQ_MSG, "ATQ: desc and buffer writeback:\n");
1044
1045         ice_debug_cq(hw, (void *)desc, buf, buf_size);
1046
1047         /* save writeback AQ if requested */
1048         if (details->wb_desc)
1049                 memcpy(details->wb_desc, desc_on_ring,
1050                        sizeof(*details->wb_desc));
1051
1052         /* update the error if time out occurred */
1053         if (!cmd_completed) {
1054                 if (rd32(hw, cq->rq.len) & cq->rq.len_crit_mask ||
1055                     rd32(hw, cq->sq.len) & cq->sq.len_crit_mask) {
1056                         ice_debug(hw, ICE_DBG_AQ_MSG, "Critical FW error.\n");
1057                         status = ICE_ERR_AQ_FW_CRITICAL;
1058                 } else {
1059                         ice_debug(hw, ICE_DBG_AQ_MSG, "Control Send Queue Writeback timeout.\n");
1060                         status = ICE_ERR_AQ_TIMEOUT;
1061                 }
1062         }
1063
1064 sq_send_command_error:
1065         mutex_unlock(&cq->sq_lock);
1066         return status;
1067 }
1068
1069 /**
1070  * ice_fill_dflt_direct_cmd_desc - AQ descriptor helper function
1071  * @desc: pointer to the temp descriptor (non DMA mem)
1072  * @opcode: the opcode can be used to decide which flags to turn off or on
1073  *
1074  * Fill the desc with default values
1075  */
1076 void ice_fill_dflt_direct_cmd_desc(struct ice_aq_desc *desc, u16 opcode)
1077 {
1078         /* zero out the desc */
1079         memset(desc, 0, sizeof(*desc));
1080         desc->opcode = cpu_to_le16(opcode);
1081         desc->flags = cpu_to_le16(ICE_AQ_FLAG_SI);
1082 }
1083
1084 /**
1085  * ice_clean_rq_elem
1086  * @hw: pointer to the HW struct
1087  * @cq: pointer to the specific Control queue
1088  * @e: event info from the receive descriptor, includes any buffers
1089  * @pending: number of events that could be left to process
1090  *
1091  * This function cleans one Admin Receive Queue element and returns
1092  * the contents through e. It can also return how many events are
1093  * left to process through 'pending'.
1094  */
1095 enum ice_status
1096 ice_clean_rq_elem(struct ice_hw *hw, struct ice_ctl_q_info *cq,
1097                   struct ice_rq_event_info *e, u16 *pending)
1098 {
1099         u16 ntc = cq->rq.next_to_clean;
1100         enum ice_status ret_code = 0;
1101         struct ice_aq_desc *desc;
1102         struct ice_dma_mem *bi;
1103         u16 desc_idx;
1104         u16 datalen;
1105         u16 flags;
1106         u16 ntu;
1107
1108         /* pre-clean the event info */
1109         memset(&e->desc, 0, sizeof(e->desc));
1110
1111         /* take the lock before we start messing with the ring */
1112         mutex_lock(&cq->rq_lock);
1113
1114         if (!cq->rq.count) {
1115                 ice_debug(hw, ICE_DBG_AQ_MSG, "Control Receive queue not initialized.\n");
1116                 ret_code = ICE_ERR_AQ_EMPTY;
1117                 goto clean_rq_elem_err;
1118         }
1119
1120         /* set next_to_use to head */
1121         ntu = (u16)(rd32(hw, cq->rq.head) & cq->rq.head_mask);
1122
1123         if (ntu == ntc) {
1124                 /* nothing to do - shouldn't need to update ring's values */
1125                 ret_code = ICE_ERR_AQ_NO_WORK;
1126                 goto clean_rq_elem_out;
1127         }
1128
1129         /* now clean the next descriptor */
1130         desc = ICE_CTL_Q_DESC(cq->rq, ntc);
1131         desc_idx = ntc;
1132
1133         cq->rq_last_status = (enum ice_aq_err)le16_to_cpu(desc->retval);
1134         flags = le16_to_cpu(desc->flags);
1135         if (flags & ICE_AQ_FLAG_ERR) {
1136                 ret_code = ICE_ERR_AQ_ERROR;
1137                 ice_debug(hw, ICE_DBG_AQ_MSG, "Control Receive Queue Event 0x%04X received with error 0x%X\n",
1138                           le16_to_cpu(desc->opcode),
1139                           cq->rq_last_status);
1140         }
1141         memcpy(&e->desc, desc, sizeof(e->desc));
1142         datalen = le16_to_cpu(desc->datalen);
1143         e->msg_len = min_t(u16, datalen, e->buf_len);
1144         if (e->msg_buf && e->msg_len)
1145                 memcpy(e->msg_buf, cq->rq.r.rq_bi[desc_idx].va, e->msg_len);
1146
1147         ice_debug(hw, ICE_DBG_AQ_DESC, "ARQ: desc and buffer:\n");
1148
1149         ice_debug_cq(hw, (void *)desc, e->msg_buf, cq->rq_buf_size);
1150
1151         /* Restore the original datalen and buffer address in the desc,
1152          * FW updates datalen to indicate the event message size
1153          */
1154         bi = &cq->rq.r.rq_bi[ntc];
1155         memset(desc, 0, sizeof(*desc));
1156
1157         desc->flags = cpu_to_le16(ICE_AQ_FLAG_BUF);
1158         if (cq->rq_buf_size > ICE_AQ_LG_BUF)
1159                 desc->flags |= cpu_to_le16(ICE_AQ_FLAG_LB);
1160         desc->datalen = cpu_to_le16(bi->size);
1161         desc->params.generic.addr_high = cpu_to_le32(upper_32_bits(bi->pa));
1162         desc->params.generic.addr_low = cpu_to_le32(lower_32_bits(bi->pa));
1163
1164         /* set tail = the last cleaned desc index. */
1165         wr32(hw, cq->rq.tail, ntc);
1166         /* ntc is updated to tail + 1 */
1167         ntc++;
1168         if (ntc == cq->num_rq_entries)
1169                 ntc = 0;
1170         cq->rq.next_to_clean = ntc;
1171         cq->rq.next_to_use = ntu;
1172
1173 clean_rq_elem_out:
1174         /* Set pending if needed, unlock and return */
1175         if (pending) {
1176                 /* re-read HW head to calculate actual pending messages */
1177                 ntu = (u16)(rd32(hw, cq->rq.head) & cq->rq.head_mask);
1178                 *pending = (u16)((ntc > ntu ? cq->rq.count : 0) + (ntu - ntc));
1179         }
1180 clean_rq_elem_err:
1181         mutex_unlock(&cq->rq_lock);
1182
1183         return ret_code;
1184 }