1 // SPDX-License-Identifier: (GPL-2.0-only OR BSD-3-Clause) 2 /* QLogic qed NIC Driver 3 * Copyright (c) 2015-2017 QLogic Corporation 4 * Copyright (c) 2019-2020 Marvell International Ltd. 5 */ 6 7 #include <linux/types.h> 8 #include <asm/byteorder.h> 9 #include <linux/io.h> 10 #include <linux/delay.h> 11 #include <linux/dma-mapping.h> 12 #include <linux/errno.h> 13 #include <linux/kernel.h> 14 #include <linux/list.h> 15 #include <linux/pci.h> 16 #include <linux/slab.h> 17 #include <linux/spinlock.h> 18 #include <linux/string.h> 19 #include "qed.h" 20 #include "qed_cxt.h" 21 #include "qed_dev_api.h" 22 #include "qed_hsi.h" 23 #include "qed_hw.h" 24 #include "qed_int.h" 25 #include "qed_iscsi.h" 26 #include "qed_mcp.h" 27 #include "qed_ooo.h" 28 #include "qed_reg_addr.h" 29 #include "qed_sp.h" 30 #include "qed_sriov.h" 31 #include "qed_rdma.h" 32 33 /*************************************************************************** 34 * Structures & Definitions 35 ***************************************************************************/ 36 37 #define SPQ_HIGH_PRI_RESERVE_DEFAULT (1) 38 39 #define SPQ_BLOCK_DELAY_MAX_ITER (10) 40 #define SPQ_BLOCK_DELAY_US (10) 41 #define SPQ_BLOCK_SLEEP_MAX_ITER (1000) 42 #define SPQ_BLOCK_SLEEP_MS (5) 43 44 /*************************************************************************** 45 * Blocking Imp. (BLOCK/EBLOCK mode) 46 ***************************************************************************/ 47 static void qed_spq_blocking_cb(struct qed_hwfn *p_hwfn, 48 void *cookie, 49 union event_ring_data *data, u8 fw_return_code) 50 { 51 struct qed_spq_comp_done *comp_done; 52 53 comp_done = (struct qed_spq_comp_done *)cookie; 54 55 comp_done->fw_return_code = fw_return_code; 56 57 /* Make sure completion done is visible on waiting thread */ 58 smp_store_release(&comp_done->done, 0x1); 59 } 60 61 static int __qed_spq_block(struct qed_hwfn *p_hwfn, 62 struct qed_spq_entry *p_ent, 63 u8 *p_fw_ret, bool sleep_between_iter) 64 { 65 struct qed_spq_comp_done *comp_done; 66 u32 iter_cnt; 67 68 comp_done = (struct qed_spq_comp_done *)p_ent->comp_cb.cookie; 69 iter_cnt = sleep_between_iter ? SPQ_BLOCK_SLEEP_MAX_ITER 70 : SPQ_BLOCK_DELAY_MAX_ITER; 71 72 while (iter_cnt--) { 73 /* Validate we receive completion update */ 74 if (smp_load_acquire(&comp_done->done) == 1) { /* ^^^ */ 75 if (p_fw_ret) 76 *p_fw_ret = comp_done->fw_return_code; 77 return 0; 78 } 79 80 if (sleep_between_iter) 81 msleep(SPQ_BLOCK_SLEEP_MS); 82 else 83 udelay(SPQ_BLOCK_DELAY_US); 84 } 85 86 return -EBUSY; 87 } 88 89 static int qed_spq_block(struct qed_hwfn *p_hwfn, 90 struct qed_spq_entry *p_ent, 91 u8 *p_fw_ret, bool skip_quick_poll) 92 { 93 struct qed_spq_comp_done *comp_done; 94 struct qed_ptt *p_ptt; 95 int rc; 96 97 /* A relatively short polling period w/o sleeping, to allow the FW to 98 * complete the ramrod and thus possibly to avoid the following sleeps. 99 */ 100 if (!skip_quick_poll) { 101 rc = __qed_spq_block(p_hwfn, p_ent, p_fw_ret, false); 102 if (!rc) 103 return 0; 104 } 105 106 /* Move to polling with a sleeping period between iterations */ 107 rc = __qed_spq_block(p_hwfn, p_ent, p_fw_ret, true); 108 if (!rc) 109 return 0; 110 111 p_ptt = qed_ptt_acquire(p_hwfn); 112 if (!p_ptt) { 113 DP_NOTICE(p_hwfn, "ptt, failed to acquire\n"); 114 return -EAGAIN; 115 } 116 117 DP_INFO(p_hwfn, "Ramrod is stuck, requesting MCP drain\n"); 118 rc = qed_mcp_drain(p_hwfn, p_ptt); 119 qed_ptt_release(p_hwfn, p_ptt); 120 if (rc) { 121 DP_NOTICE(p_hwfn, "MCP drain failed\n"); 122 goto err; 123 } 124 125 /* Retry after drain */ 126 rc = __qed_spq_block(p_hwfn, p_ent, p_fw_ret, true); 127 if (!rc) 128 return 0; 129 130 comp_done = (struct qed_spq_comp_done *)p_ent->comp_cb.cookie; 131 if (comp_done->done == 1) { 132 if (p_fw_ret) 133 *p_fw_ret = comp_done->fw_return_code; 134 return 0; 135 } 136 err: 137 p_ptt = qed_ptt_acquire(p_hwfn); 138 if (!p_ptt) 139 return -EBUSY; 140 qed_hw_err_notify(p_hwfn, p_ptt, QED_HW_ERR_RAMROD_FAIL, 141 "Ramrod is stuck [CID %08x cmd %02x protocol %02x echo %04x]\n", 142 le32_to_cpu(p_ent->elem.hdr.cid), 143 p_ent->elem.hdr.cmd_id, 144 p_ent->elem.hdr.protocol_id, 145 le16_to_cpu(p_ent->elem.hdr.echo)); 146 qed_ptt_release(p_hwfn, p_ptt); 147 148 return -EBUSY; 149 } 150 151 /*************************************************************************** 152 * SPQ entries inner API 153 ***************************************************************************/ 154 static int qed_spq_fill_entry(struct qed_hwfn *p_hwfn, 155 struct qed_spq_entry *p_ent) 156 { 157 p_ent->flags = 0; 158 159 switch (p_ent->comp_mode) { 160 case QED_SPQ_MODE_EBLOCK: 161 case QED_SPQ_MODE_BLOCK: 162 p_ent->comp_cb.function = qed_spq_blocking_cb; 163 break; 164 case QED_SPQ_MODE_CB: 165 break; 166 default: 167 DP_NOTICE(p_hwfn, "Unknown SPQE completion mode %d\n", 168 p_ent->comp_mode); 169 return -EINVAL; 170 } 171 172 DP_VERBOSE(p_hwfn, QED_MSG_SPQ, 173 "Ramrod header: [CID 0x%08x CMD 0x%02x protocol 0x%02x] Data pointer: [%08x:%08x] Completion Mode: %s\n", 174 p_ent->elem.hdr.cid, 175 p_ent->elem.hdr.cmd_id, 176 p_ent->elem.hdr.protocol_id, 177 p_ent->elem.data_ptr.hi, 178 p_ent->elem.data_ptr.lo, 179 D_TRINE(p_ent->comp_mode, QED_SPQ_MODE_EBLOCK, 180 QED_SPQ_MODE_BLOCK, "MODE_EBLOCK", "MODE_BLOCK", 181 "MODE_CB")); 182 183 return 0; 184 } 185 186 /*************************************************************************** 187 * HSI access 188 ***************************************************************************/ 189 static void qed_spq_hw_initialize(struct qed_hwfn *p_hwfn, 190 struct qed_spq *p_spq) 191 { 192 struct e4_core_conn_context *p_cxt; 193 struct qed_cxt_info cxt_info; 194 u16 physical_q; 195 int rc; 196 197 cxt_info.iid = p_spq->cid; 198 199 rc = qed_cxt_get_cid_info(p_hwfn, &cxt_info); 200 201 if (rc < 0) { 202 DP_NOTICE(p_hwfn, "Cannot find context info for cid=%d\n", 203 p_spq->cid); 204 return; 205 } 206 207 p_cxt = cxt_info.p_cxt; 208 209 SET_FIELD(p_cxt->xstorm_ag_context.flags10, 210 E4_XSTORM_CORE_CONN_AG_CTX_DQ_CF_EN, 1); 211 SET_FIELD(p_cxt->xstorm_ag_context.flags1, 212 E4_XSTORM_CORE_CONN_AG_CTX_DQ_CF_ACTIVE, 1); 213 SET_FIELD(p_cxt->xstorm_ag_context.flags9, 214 E4_XSTORM_CORE_CONN_AG_CTX_CONSOLID_PROD_CF_EN, 1); 215 216 /* QM physical queue */ 217 physical_q = qed_get_cm_pq_idx(p_hwfn, PQ_FLAGS_LB); 218 p_cxt->xstorm_ag_context.physical_q0 = cpu_to_le16(physical_q); 219 220 p_cxt->xstorm_st_context.spq_base_lo = 221 DMA_LO_LE(p_spq->chain.p_phys_addr); 222 p_cxt->xstorm_st_context.spq_base_hi = 223 DMA_HI_LE(p_spq->chain.p_phys_addr); 224 225 DMA_REGPAIR_LE(p_cxt->xstorm_st_context.consolid_base_addr, 226 p_hwfn->p_consq->chain.p_phys_addr); 227 } 228 229 static int qed_spq_hw_post(struct qed_hwfn *p_hwfn, 230 struct qed_spq *p_spq, struct qed_spq_entry *p_ent) 231 { 232 struct qed_chain *p_chain = &p_hwfn->p_spq->chain; 233 struct core_db_data *p_db_data = &p_spq->db_data; 234 u16 echo = qed_chain_get_prod_idx(p_chain); 235 struct slow_path_element *elem; 236 237 p_ent->elem.hdr.echo = cpu_to_le16(echo); 238 elem = qed_chain_produce(p_chain); 239 if (!elem) { 240 DP_NOTICE(p_hwfn, "Failed to produce from SPQ chain\n"); 241 return -EINVAL; 242 } 243 244 *elem = p_ent->elem; /* struct assignment */ 245 246 /* send a doorbell on the slow hwfn session */ 247 p_db_data->spq_prod = cpu_to_le16(qed_chain_get_prod_idx(p_chain)); 248 249 /* make sure the SPQE is updated before the doorbell */ 250 wmb(); 251 252 DOORBELL(p_hwfn, p_spq->db_addr_offset, *(u32 *)p_db_data); 253 254 /* make sure doorbell is rang */ 255 wmb(); 256 257 DP_VERBOSE(p_hwfn, QED_MSG_SPQ, 258 "Doorbelled [0x%08x, CID 0x%08x] with Flags: %02x agg_params: %02x, prod: %04x\n", 259 p_spq->db_addr_offset, 260 p_spq->cid, 261 p_db_data->params, 262 p_db_data->agg_flags, qed_chain_get_prod_idx(p_chain)); 263 264 return 0; 265 } 266 267 /*************************************************************************** 268 * Asynchronous events 269 ***************************************************************************/ 270 static int 271 qed_async_event_completion(struct qed_hwfn *p_hwfn, 272 struct event_ring_entry *p_eqe) 273 { 274 qed_spq_async_comp_cb cb; 275 276 if (!p_hwfn->p_spq || (p_eqe->protocol_id >= MAX_PROTOCOL_TYPE)) 277 return -EINVAL; 278 279 cb = p_hwfn->p_spq->async_comp_cb[p_eqe->protocol_id]; 280 if (cb) { 281 return cb(p_hwfn, p_eqe->opcode, p_eqe->echo, 282 &p_eqe->data, p_eqe->fw_return_code); 283 } else { 284 DP_NOTICE(p_hwfn, 285 "Unknown Async completion for protocol: %d\n", 286 p_eqe->protocol_id); 287 return -EINVAL; 288 } 289 } 290 291 int 292 qed_spq_register_async_cb(struct qed_hwfn *p_hwfn, 293 enum protocol_type protocol_id, 294 qed_spq_async_comp_cb cb) 295 { 296 if (!p_hwfn->p_spq || (protocol_id >= MAX_PROTOCOL_TYPE)) 297 return -EINVAL; 298 299 p_hwfn->p_spq->async_comp_cb[protocol_id] = cb; 300 return 0; 301 } 302 303 void 304 qed_spq_unregister_async_cb(struct qed_hwfn *p_hwfn, 305 enum protocol_type protocol_id) 306 { 307 if (!p_hwfn->p_spq || (protocol_id >= MAX_PROTOCOL_TYPE)) 308 return; 309 310 p_hwfn->p_spq->async_comp_cb[protocol_id] = NULL; 311 } 312 313 /*************************************************************************** 314 * EQ API 315 ***************************************************************************/ 316 void qed_eq_prod_update(struct qed_hwfn *p_hwfn, u16 prod) 317 { 318 u32 addr = GTT_BAR0_MAP_REG_USDM_RAM + 319 USTORM_EQE_CONS_OFFSET(p_hwfn->rel_pf_id); 320 321 REG_WR16(p_hwfn, addr, prod); 322 } 323 324 int qed_eq_completion(struct qed_hwfn *p_hwfn, void *cookie) 325 { 326 struct qed_eq *p_eq = cookie; 327 struct qed_chain *p_chain = &p_eq->chain; 328 int rc = 0; 329 330 /* take a snapshot of the FW consumer */ 331 u16 fw_cons_idx = le16_to_cpu(*p_eq->p_fw_cons); 332 333 DP_VERBOSE(p_hwfn, QED_MSG_SPQ, "fw_cons_idx %x\n", fw_cons_idx); 334 335 /* Need to guarantee the fw_cons index we use points to a usuable 336 * element (to comply with our chain), so our macros would comply 337 */ 338 if ((fw_cons_idx & qed_chain_get_usable_per_page(p_chain)) == 339 qed_chain_get_usable_per_page(p_chain)) 340 fw_cons_idx += qed_chain_get_unusable_per_page(p_chain); 341 342 /* Complete current segment of eq entries */ 343 while (fw_cons_idx != qed_chain_get_cons_idx(p_chain)) { 344 struct event_ring_entry *p_eqe = qed_chain_consume(p_chain); 345 346 if (!p_eqe) { 347 rc = -EINVAL; 348 break; 349 } 350 351 DP_VERBOSE(p_hwfn, QED_MSG_SPQ, 352 "op %x prot %x res0 %x echo %x fwret %x flags %x\n", 353 p_eqe->opcode, 354 p_eqe->protocol_id, 355 p_eqe->reserved0, 356 le16_to_cpu(p_eqe->echo), 357 p_eqe->fw_return_code, 358 p_eqe->flags); 359 360 if (GET_FIELD(p_eqe->flags, EVENT_RING_ENTRY_ASYNC)) { 361 if (qed_async_event_completion(p_hwfn, p_eqe)) 362 rc = -EINVAL; 363 } else if (qed_spq_completion(p_hwfn, 364 p_eqe->echo, 365 p_eqe->fw_return_code, 366 &p_eqe->data)) { 367 rc = -EINVAL; 368 } 369 370 qed_chain_recycle_consumed(p_chain); 371 } 372 373 qed_eq_prod_update(p_hwfn, qed_chain_get_prod_idx(p_chain)); 374 375 /* Attempt to post pending requests */ 376 spin_lock_bh(&p_hwfn->p_spq->lock); 377 rc = qed_spq_pend_post(p_hwfn); 378 spin_unlock_bh(&p_hwfn->p_spq->lock); 379 380 return rc; 381 } 382 383 int qed_eq_alloc(struct qed_hwfn *p_hwfn, u16 num_elem) 384 { 385 struct qed_eq *p_eq; 386 387 /* Allocate EQ struct */ 388 p_eq = kzalloc(sizeof(*p_eq), GFP_KERNEL); 389 if (!p_eq) 390 return -ENOMEM; 391 392 /* Allocate and initialize EQ chain*/ 393 if (qed_chain_alloc(p_hwfn->cdev, 394 QED_CHAIN_USE_TO_PRODUCE, 395 QED_CHAIN_MODE_PBL, 396 QED_CHAIN_CNT_TYPE_U16, 397 num_elem, 398 sizeof(union event_ring_element), 399 &p_eq->chain, NULL)) 400 goto eq_allocate_fail; 401 402 /* register EQ completion on the SP SB */ 403 qed_int_register_cb(p_hwfn, qed_eq_completion, 404 p_eq, &p_eq->eq_sb_index, &p_eq->p_fw_cons); 405 406 p_hwfn->p_eq = p_eq; 407 return 0; 408 409 eq_allocate_fail: 410 kfree(p_eq); 411 return -ENOMEM; 412 } 413 414 void qed_eq_setup(struct qed_hwfn *p_hwfn) 415 { 416 qed_chain_reset(&p_hwfn->p_eq->chain); 417 } 418 419 void qed_eq_free(struct qed_hwfn *p_hwfn) 420 { 421 if (!p_hwfn->p_eq) 422 return; 423 424 qed_chain_free(p_hwfn->cdev, &p_hwfn->p_eq->chain); 425 426 kfree(p_hwfn->p_eq); 427 p_hwfn->p_eq = NULL; 428 } 429 430 /*************************************************************************** 431 * CQE API - manipulate EQ functionality 432 ***************************************************************************/ 433 static int qed_cqe_completion(struct qed_hwfn *p_hwfn, 434 struct eth_slow_path_rx_cqe *cqe, 435 enum protocol_type protocol) 436 { 437 if (IS_VF(p_hwfn->cdev)) 438 return 0; 439 440 /* @@@tmp - it's possible we'll eventually want to handle some 441 * actual commands that can arrive here, but for now this is only 442 * used to complete the ramrod using the echo value on the cqe 443 */ 444 return qed_spq_completion(p_hwfn, cqe->echo, 0, NULL); 445 } 446 447 int qed_eth_cqe_completion(struct qed_hwfn *p_hwfn, 448 struct eth_slow_path_rx_cqe *cqe) 449 { 450 int rc; 451 452 rc = qed_cqe_completion(p_hwfn, cqe, PROTOCOLID_ETH); 453 if (rc) 454 DP_NOTICE(p_hwfn, 455 "Failed to handle RXQ CQE [cmd 0x%02x]\n", 456 cqe->ramrod_cmd_id); 457 458 return rc; 459 } 460 461 /*************************************************************************** 462 * Slow hwfn Queue (spq) 463 ***************************************************************************/ 464 void qed_spq_setup(struct qed_hwfn *p_hwfn) 465 { 466 struct qed_spq *p_spq = p_hwfn->p_spq; 467 struct qed_spq_entry *p_virt = NULL; 468 struct core_db_data *p_db_data; 469 void __iomem *db_addr; 470 dma_addr_t p_phys = 0; 471 u32 i, capacity; 472 int rc; 473 474 INIT_LIST_HEAD(&p_spq->pending); 475 INIT_LIST_HEAD(&p_spq->completion_pending); 476 INIT_LIST_HEAD(&p_spq->free_pool); 477 INIT_LIST_HEAD(&p_spq->unlimited_pending); 478 spin_lock_init(&p_spq->lock); 479 480 /* SPQ empty pool */ 481 p_phys = p_spq->p_phys + offsetof(struct qed_spq_entry, ramrod); 482 p_virt = p_spq->p_virt; 483 484 capacity = qed_chain_get_capacity(&p_spq->chain); 485 for (i = 0; i < capacity; i++) { 486 DMA_REGPAIR_LE(p_virt->elem.data_ptr, p_phys); 487 488 list_add_tail(&p_virt->list, &p_spq->free_pool); 489 490 p_virt++; 491 p_phys += sizeof(struct qed_spq_entry); 492 } 493 494 /* Statistics */ 495 p_spq->normal_count = 0; 496 p_spq->comp_count = 0; 497 p_spq->comp_sent_count = 0; 498 p_spq->unlimited_pending_count = 0; 499 500 bitmap_zero(p_spq->p_comp_bitmap, SPQ_RING_SIZE); 501 p_spq->comp_bitmap_idx = 0; 502 503 /* SPQ cid, cannot fail */ 504 qed_cxt_acquire_cid(p_hwfn, PROTOCOLID_CORE, &p_spq->cid); 505 qed_spq_hw_initialize(p_hwfn, p_spq); 506 507 /* reset the chain itself */ 508 qed_chain_reset(&p_spq->chain); 509 510 /* Initialize the address/data of the SPQ doorbell */ 511 p_spq->db_addr_offset = qed_db_addr(p_spq->cid, DQ_DEMS_LEGACY); 512 p_db_data = &p_spq->db_data; 513 memset(p_db_data, 0, sizeof(*p_db_data)); 514 SET_FIELD(p_db_data->params, CORE_DB_DATA_DEST, DB_DEST_XCM); 515 SET_FIELD(p_db_data->params, CORE_DB_DATA_AGG_CMD, DB_AGG_CMD_MAX); 516 SET_FIELD(p_db_data->params, CORE_DB_DATA_AGG_VAL_SEL, 517 DQ_XCM_CORE_SPQ_PROD_CMD); 518 p_db_data->agg_flags = DQ_XCM_CORE_DQ_CF_CMD; 519 520 /* Register the SPQ doorbell with the doorbell recovery mechanism */ 521 db_addr = (void __iomem *)((u8 __iomem *)p_hwfn->doorbells + 522 p_spq->db_addr_offset); 523 rc = qed_db_recovery_add(p_hwfn->cdev, db_addr, &p_spq->db_data, 524 DB_REC_WIDTH_32B, DB_REC_KERNEL); 525 if (rc) 526 DP_INFO(p_hwfn, 527 "Failed to register the SPQ doorbell with the doorbell recovery mechanism\n"); 528 } 529 530 int qed_spq_alloc(struct qed_hwfn *p_hwfn) 531 { 532 struct qed_spq_entry *p_virt = NULL; 533 struct qed_spq *p_spq = NULL; 534 dma_addr_t p_phys = 0; 535 u32 capacity; 536 537 /* SPQ struct */ 538 p_spq = kzalloc(sizeof(struct qed_spq), GFP_KERNEL); 539 if (!p_spq) 540 return -ENOMEM; 541 542 /* SPQ ring */ 543 if (qed_chain_alloc(p_hwfn->cdev, 544 QED_CHAIN_USE_TO_PRODUCE, 545 QED_CHAIN_MODE_SINGLE, 546 QED_CHAIN_CNT_TYPE_U16, 547 0, /* N/A when the mode is SINGLE */ 548 sizeof(struct slow_path_element), 549 &p_spq->chain, NULL)) 550 goto spq_allocate_fail; 551 552 /* allocate and fill the SPQ elements (incl. ramrod data list) */ 553 capacity = qed_chain_get_capacity(&p_spq->chain); 554 p_virt = dma_alloc_coherent(&p_hwfn->cdev->pdev->dev, 555 capacity * sizeof(struct qed_spq_entry), 556 &p_phys, GFP_KERNEL); 557 if (!p_virt) 558 goto spq_allocate_fail; 559 560 p_spq->p_virt = p_virt; 561 p_spq->p_phys = p_phys; 562 p_hwfn->p_spq = p_spq; 563 564 return 0; 565 566 spq_allocate_fail: 567 qed_chain_free(p_hwfn->cdev, &p_spq->chain); 568 kfree(p_spq); 569 return -ENOMEM; 570 } 571 572 void qed_spq_free(struct qed_hwfn *p_hwfn) 573 { 574 struct qed_spq *p_spq = p_hwfn->p_spq; 575 void __iomem *db_addr; 576 u32 capacity; 577 578 if (!p_spq) 579 return; 580 581 /* Delete the SPQ doorbell from the doorbell recovery mechanism */ 582 db_addr = (void __iomem *)((u8 __iomem *)p_hwfn->doorbells + 583 p_spq->db_addr_offset); 584 qed_db_recovery_del(p_hwfn->cdev, db_addr, &p_spq->db_data); 585 586 if (p_spq->p_virt) { 587 capacity = qed_chain_get_capacity(&p_spq->chain); 588 dma_free_coherent(&p_hwfn->cdev->pdev->dev, 589 capacity * 590 sizeof(struct qed_spq_entry), 591 p_spq->p_virt, p_spq->p_phys); 592 } 593 594 qed_chain_free(p_hwfn->cdev, &p_spq->chain); 595 kfree(p_spq); 596 p_hwfn->p_spq = NULL; 597 } 598 599 int qed_spq_get_entry(struct qed_hwfn *p_hwfn, struct qed_spq_entry **pp_ent) 600 { 601 struct qed_spq *p_spq = p_hwfn->p_spq; 602 struct qed_spq_entry *p_ent = NULL; 603 int rc = 0; 604 605 spin_lock_bh(&p_spq->lock); 606 607 if (list_empty(&p_spq->free_pool)) { 608 p_ent = kzalloc(sizeof(*p_ent), GFP_ATOMIC); 609 if (!p_ent) { 610 DP_NOTICE(p_hwfn, 611 "Failed to allocate an SPQ entry for a pending ramrod\n"); 612 rc = -ENOMEM; 613 goto out_unlock; 614 } 615 p_ent->queue = &p_spq->unlimited_pending; 616 } else { 617 p_ent = list_first_entry(&p_spq->free_pool, 618 struct qed_spq_entry, list); 619 list_del(&p_ent->list); 620 p_ent->queue = &p_spq->pending; 621 } 622 623 *pp_ent = p_ent; 624 625 out_unlock: 626 spin_unlock_bh(&p_spq->lock); 627 return rc; 628 } 629 630 /* Locked variant; Should be called while the SPQ lock is taken */ 631 static void __qed_spq_return_entry(struct qed_hwfn *p_hwfn, 632 struct qed_spq_entry *p_ent) 633 { 634 list_add_tail(&p_ent->list, &p_hwfn->p_spq->free_pool); 635 } 636 637 void qed_spq_return_entry(struct qed_hwfn *p_hwfn, struct qed_spq_entry *p_ent) 638 { 639 spin_lock_bh(&p_hwfn->p_spq->lock); 640 __qed_spq_return_entry(p_hwfn, p_ent); 641 spin_unlock_bh(&p_hwfn->p_spq->lock); 642 } 643 644 /** 645 * @brief qed_spq_add_entry - adds a new entry to the pending 646 * list. Should be used while lock is being held. 647 * 648 * Addes an entry to the pending list is there is room (en empty 649 * element is available in the free_pool), or else places the 650 * entry in the unlimited_pending pool. 651 * 652 * @param p_hwfn 653 * @param p_ent 654 * @param priority 655 * 656 * @return int 657 */ 658 static int qed_spq_add_entry(struct qed_hwfn *p_hwfn, 659 struct qed_spq_entry *p_ent, 660 enum spq_priority priority) 661 { 662 struct qed_spq *p_spq = p_hwfn->p_spq; 663 664 if (p_ent->queue == &p_spq->unlimited_pending) { 665 666 if (list_empty(&p_spq->free_pool)) { 667 list_add_tail(&p_ent->list, &p_spq->unlimited_pending); 668 p_spq->unlimited_pending_count++; 669 670 return 0; 671 } else { 672 struct qed_spq_entry *p_en2; 673 674 p_en2 = list_first_entry(&p_spq->free_pool, 675 struct qed_spq_entry, list); 676 list_del(&p_en2->list); 677 678 /* Copy the ring element physical pointer to the new 679 * entry, since we are about to override the entire ring 680 * entry and don't want to lose the pointer. 681 */ 682 p_ent->elem.data_ptr = p_en2->elem.data_ptr; 683 684 *p_en2 = *p_ent; 685 686 /* EBLOCK responsible to free the allocated p_ent */ 687 if (p_ent->comp_mode != QED_SPQ_MODE_EBLOCK) 688 kfree(p_ent); 689 else 690 p_ent->post_ent = p_en2; 691 692 p_ent = p_en2; 693 } 694 } 695 696 /* entry is to be placed in 'pending' queue */ 697 switch (priority) { 698 case QED_SPQ_PRIORITY_NORMAL: 699 list_add_tail(&p_ent->list, &p_spq->pending); 700 p_spq->normal_count++; 701 break; 702 case QED_SPQ_PRIORITY_HIGH: 703 list_add(&p_ent->list, &p_spq->pending); 704 p_spq->high_count++; 705 break; 706 default: 707 return -EINVAL; 708 } 709 710 return 0; 711 } 712 713 /*************************************************************************** 714 * Accessor 715 ***************************************************************************/ 716 u32 qed_spq_get_cid(struct qed_hwfn *p_hwfn) 717 { 718 if (!p_hwfn->p_spq) 719 return 0xffffffff; /* illegal */ 720 return p_hwfn->p_spq->cid; 721 } 722 723 /*************************************************************************** 724 * Posting new Ramrods 725 ***************************************************************************/ 726 static int qed_spq_post_list(struct qed_hwfn *p_hwfn, 727 struct list_head *head, u32 keep_reserve) 728 { 729 struct qed_spq *p_spq = p_hwfn->p_spq; 730 int rc; 731 732 while (qed_chain_get_elem_left(&p_spq->chain) > keep_reserve && 733 !list_empty(head)) { 734 struct qed_spq_entry *p_ent = 735 list_first_entry(head, struct qed_spq_entry, list); 736 list_move_tail(&p_ent->list, &p_spq->completion_pending); 737 p_spq->comp_sent_count++; 738 739 rc = qed_spq_hw_post(p_hwfn, p_spq, p_ent); 740 if (rc) { 741 list_del(&p_ent->list); 742 __qed_spq_return_entry(p_hwfn, p_ent); 743 return rc; 744 } 745 } 746 747 return 0; 748 } 749 750 int qed_spq_pend_post(struct qed_hwfn *p_hwfn) 751 { 752 struct qed_spq *p_spq = p_hwfn->p_spq; 753 struct qed_spq_entry *p_ent = NULL; 754 755 while (!list_empty(&p_spq->free_pool)) { 756 if (list_empty(&p_spq->unlimited_pending)) 757 break; 758 759 p_ent = list_first_entry(&p_spq->unlimited_pending, 760 struct qed_spq_entry, list); 761 if (!p_ent) 762 return -EINVAL; 763 764 list_del(&p_ent->list); 765 766 qed_spq_add_entry(p_hwfn, p_ent, p_ent->priority); 767 } 768 769 return qed_spq_post_list(p_hwfn, &p_spq->pending, 770 SPQ_HIGH_PRI_RESERVE_DEFAULT); 771 } 772 773 static void qed_spq_recov_set_ret_code(struct qed_spq_entry *p_ent, 774 u8 *fw_return_code) 775 { 776 if (!fw_return_code) 777 return; 778 779 if (p_ent->elem.hdr.protocol_id == PROTOCOLID_ROCE || 780 p_ent->elem.hdr.protocol_id == PROTOCOLID_IWARP) 781 *fw_return_code = RDMA_RETURN_OK; 782 } 783 784 /* Avoid overriding of SPQ entries when getting out-of-order completions, by 785 * marking the completions in a bitmap and increasing the chain consumer only 786 * for the first successive completed entries. 787 */ 788 static void qed_spq_comp_bmap_update(struct qed_hwfn *p_hwfn, __le16 echo) 789 { 790 u16 pos = le16_to_cpu(echo) % SPQ_RING_SIZE; 791 struct qed_spq *p_spq = p_hwfn->p_spq; 792 793 __set_bit(pos, p_spq->p_comp_bitmap); 794 while (test_bit(p_spq->comp_bitmap_idx, 795 p_spq->p_comp_bitmap)) { 796 __clear_bit(p_spq->comp_bitmap_idx, 797 p_spq->p_comp_bitmap); 798 p_spq->comp_bitmap_idx++; 799 qed_chain_return_produced(&p_spq->chain); 800 } 801 } 802 803 int qed_spq_post(struct qed_hwfn *p_hwfn, 804 struct qed_spq_entry *p_ent, u8 *fw_return_code) 805 { 806 int rc = 0; 807 struct qed_spq *p_spq = p_hwfn ? p_hwfn->p_spq : NULL; 808 bool b_ret_ent = true; 809 bool eblock; 810 811 if (!p_hwfn) 812 return -EINVAL; 813 814 if (!p_ent) { 815 DP_NOTICE(p_hwfn, "Got a NULL pointer\n"); 816 return -EINVAL; 817 } 818 819 if (p_hwfn->cdev->recov_in_prog) { 820 DP_VERBOSE(p_hwfn, 821 QED_MSG_SPQ, 822 "Recovery is in progress. Skip spq post [cmd %02x protocol %02x]\n", 823 p_ent->elem.hdr.cmd_id, p_ent->elem.hdr.protocol_id); 824 825 /* Let the flow complete w/o any error handling */ 826 qed_spq_recov_set_ret_code(p_ent, fw_return_code); 827 return 0; 828 } 829 830 /* Complete the entry */ 831 rc = qed_spq_fill_entry(p_hwfn, p_ent); 832 833 spin_lock_bh(&p_spq->lock); 834 835 /* Check return value after LOCK is taken for cleaner error flow */ 836 if (rc) 837 goto spq_post_fail; 838 839 /* Check if entry is in block mode before qed_spq_add_entry, 840 * which might kfree p_ent. 841 */ 842 eblock = (p_ent->comp_mode == QED_SPQ_MODE_EBLOCK); 843 844 /* Add the request to the pending queue */ 845 rc = qed_spq_add_entry(p_hwfn, p_ent, p_ent->priority); 846 if (rc) 847 goto spq_post_fail; 848 849 rc = qed_spq_pend_post(p_hwfn); 850 if (rc) { 851 /* Since it's possible that pending failed for a different 852 * entry [although unlikely], the failed entry was already 853 * dealt with; No need to return it here. 854 */ 855 b_ret_ent = false; 856 goto spq_post_fail; 857 } 858 859 spin_unlock_bh(&p_spq->lock); 860 861 if (eblock) { 862 /* For entries in QED BLOCK mode, the completion code cannot 863 * perform the necessary cleanup - if it did, we couldn't 864 * access p_ent here to see whether it's successful or not. 865 * Thus, after gaining the answer perform the cleanup here. 866 */ 867 rc = qed_spq_block(p_hwfn, p_ent, fw_return_code, 868 p_ent->queue == &p_spq->unlimited_pending); 869 870 if (p_ent->queue == &p_spq->unlimited_pending) { 871 struct qed_spq_entry *p_post_ent = p_ent->post_ent; 872 873 kfree(p_ent); 874 875 /* Return the entry which was actually posted */ 876 p_ent = p_post_ent; 877 } 878 879 if (rc) 880 goto spq_post_fail2; 881 882 /* return to pool */ 883 qed_spq_return_entry(p_hwfn, p_ent); 884 } 885 return rc; 886 887 spq_post_fail2: 888 spin_lock_bh(&p_spq->lock); 889 list_del(&p_ent->list); 890 qed_spq_comp_bmap_update(p_hwfn, p_ent->elem.hdr.echo); 891 892 spq_post_fail: 893 /* return to the free pool */ 894 if (b_ret_ent) 895 __qed_spq_return_entry(p_hwfn, p_ent); 896 spin_unlock_bh(&p_spq->lock); 897 898 return rc; 899 } 900 901 int qed_spq_completion(struct qed_hwfn *p_hwfn, 902 __le16 echo, 903 u8 fw_return_code, 904 union event_ring_data *p_data) 905 { 906 struct qed_spq *p_spq; 907 struct qed_spq_entry *p_ent = NULL; 908 struct qed_spq_entry *tmp; 909 struct qed_spq_entry *found = NULL; 910 911 if (!p_hwfn) 912 return -EINVAL; 913 914 p_spq = p_hwfn->p_spq; 915 if (!p_spq) 916 return -EINVAL; 917 918 spin_lock_bh(&p_spq->lock); 919 list_for_each_entry_safe(p_ent, tmp, &p_spq->completion_pending, list) { 920 if (p_ent->elem.hdr.echo == echo) { 921 list_del(&p_ent->list); 922 qed_spq_comp_bmap_update(p_hwfn, echo); 923 p_spq->comp_count++; 924 found = p_ent; 925 break; 926 } 927 928 /* This is relatively uncommon - depends on scenarios 929 * which have mutliple per-PF sent ramrods. 930 */ 931 DP_VERBOSE(p_hwfn, QED_MSG_SPQ, 932 "Got completion for echo %04x - doesn't match echo %04x in completion pending list\n", 933 le16_to_cpu(echo), 934 le16_to_cpu(p_ent->elem.hdr.echo)); 935 } 936 937 /* Release lock before callback, as callback may post 938 * an additional ramrod. 939 */ 940 spin_unlock_bh(&p_spq->lock); 941 942 if (!found) { 943 DP_NOTICE(p_hwfn, 944 "Failed to find an entry this EQE [echo %04x] completes\n", 945 le16_to_cpu(echo)); 946 return -EEXIST; 947 } 948 949 DP_VERBOSE(p_hwfn, QED_MSG_SPQ, 950 "Complete EQE [echo %04x]: func %p cookie %p)\n", 951 le16_to_cpu(echo), 952 p_ent->comp_cb.function, p_ent->comp_cb.cookie); 953 if (found->comp_cb.function) 954 found->comp_cb.function(p_hwfn, found->comp_cb.cookie, p_data, 955 fw_return_code); 956 else 957 DP_VERBOSE(p_hwfn, 958 QED_MSG_SPQ, 959 "Got a completion without a callback function\n"); 960 961 if (found->comp_mode != QED_SPQ_MODE_EBLOCK) 962 /* EBLOCK is responsible for returning its own entry into the 963 * free list. 964 */ 965 qed_spq_return_entry(p_hwfn, found); 966 967 return 0; 968 } 969 970 int qed_consq_alloc(struct qed_hwfn *p_hwfn) 971 { 972 struct qed_consq *p_consq; 973 974 /* Allocate ConsQ struct */ 975 p_consq = kzalloc(sizeof(*p_consq), GFP_KERNEL); 976 if (!p_consq) 977 return -ENOMEM; 978 979 /* Allocate and initialize EQ chain*/ 980 if (qed_chain_alloc(p_hwfn->cdev, 981 QED_CHAIN_USE_TO_PRODUCE, 982 QED_CHAIN_MODE_PBL, 983 QED_CHAIN_CNT_TYPE_U16, 984 QED_CHAIN_PAGE_SIZE / 0x80, 985 0x80, &p_consq->chain, NULL)) 986 goto consq_allocate_fail; 987 988 p_hwfn->p_consq = p_consq; 989 return 0; 990 991 consq_allocate_fail: 992 kfree(p_consq); 993 return -ENOMEM; 994 } 995 996 void qed_consq_setup(struct qed_hwfn *p_hwfn) 997 { 998 qed_chain_reset(&p_hwfn->p_consq->chain); 999 } 1000 1001 void qed_consq_free(struct qed_hwfn *p_hwfn) 1002 { 1003 if (!p_hwfn->p_consq) 1004 return; 1005 1006 qed_chain_free(p_hwfn->cdev, &p_hwfn->p_consq->chain); 1007 1008 kfree(p_hwfn->p_consq); 1009 p_hwfn->p_consq = NULL; 1010 } 1011