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 #ifndef _QED_CHAIN_H 8 #define _QED_CHAIN_H 9 10 #include <linux/types.h> 11 #include <asm/byteorder.h> 12 #include <linux/kernel.h> 13 #include <linux/list.h> 14 #include <linux/sizes.h> 15 #include <linux/slab.h> 16 #include <linux/qed/common_hsi.h> 17 18 enum qed_chain_mode { 19 /* Each Page contains a next pointer at its end */ 20 QED_CHAIN_MODE_NEXT_PTR, 21 22 /* Chain is a single page (next ptr) is not required */ 23 QED_CHAIN_MODE_SINGLE, 24 25 /* Page pointers are located in a side list */ 26 QED_CHAIN_MODE_PBL, 27 }; 28 29 enum qed_chain_use_mode { 30 QED_CHAIN_USE_TO_PRODUCE, /* Chain starts empty */ 31 QED_CHAIN_USE_TO_CONSUME, /* Chain starts full */ 32 QED_CHAIN_USE_TO_CONSUME_PRODUCE, /* Chain starts empty */ 33 }; 34 35 enum qed_chain_cnt_type { 36 /* The chain's size/prod/cons are kept in 16-bit variables */ 37 QED_CHAIN_CNT_TYPE_U16, 38 39 /* The chain's size/prod/cons are kept in 32-bit variables */ 40 QED_CHAIN_CNT_TYPE_U32, 41 }; 42 43 struct qed_chain_next { 44 struct regpair next_phys; 45 void *next_virt; 46 }; 47 48 struct qed_chain_pbl_u16 { 49 u16 prod_page_idx; 50 u16 cons_page_idx; 51 }; 52 53 struct qed_chain_pbl_u32 { 54 u32 prod_page_idx; 55 u32 cons_page_idx; 56 }; 57 58 struct qed_chain_u16 { 59 /* Cyclic index of next element to produce/consume */ 60 u16 prod_idx; 61 u16 cons_idx; 62 }; 63 64 struct qed_chain_u32 { 65 /* Cyclic index of next element to produce/consume */ 66 u32 prod_idx; 67 u32 cons_idx; 68 }; 69 70 struct addr_tbl_entry { 71 void *virt_addr; 72 dma_addr_t dma_map; 73 }; 74 75 struct qed_chain { 76 /* Fastpath portion of the chain - required for commands such 77 * as produce / consume. 78 */ 79 80 /* Point to next element to produce/consume */ 81 void *p_prod_elem; 82 void *p_cons_elem; 83 84 /* Fastpath portions of the PBL [if exists] */ 85 86 struct { 87 /* Table for keeping the virtual and physical addresses of the 88 * chain pages, respectively to the physical addresses 89 * in the pbl table. 90 */ 91 struct addr_tbl_entry *pp_addr_tbl; 92 93 union { 94 struct qed_chain_pbl_u16 u16; 95 struct qed_chain_pbl_u32 u32; 96 } c; 97 } pbl; 98 99 union { 100 struct qed_chain_u16 chain16; 101 struct qed_chain_u32 chain32; 102 } u; 103 104 /* Capacity counts only usable elements */ 105 u32 capacity; 106 u32 page_cnt; 107 108 enum qed_chain_mode mode; 109 110 /* Elements information for fast calculations */ 111 u16 elem_per_page; 112 u16 elem_per_page_mask; 113 u16 elem_size; 114 u16 next_page_mask; 115 u16 usable_per_page; 116 u8 elem_unusable; 117 118 enum qed_chain_cnt_type cnt_type; 119 120 /* Slowpath of the chain - required for initialization and destruction, 121 * but isn't involved in regular functionality. 122 */ 123 124 u32 page_size; 125 126 /* Base address of a pre-allocated buffer for pbl */ 127 struct { 128 __le64 *table_virt; 129 dma_addr_t table_phys; 130 size_t table_size; 131 } pbl_sp; 132 133 /* Address of first page of the chain - the address is required 134 * for fastpath operation [consume/produce] but only for the SINGLE 135 * flavour which isn't considered fastpath [== SPQ]. 136 */ 137 void *p_virt_addr; 138 dma_addr_t p_phys_addr; 139 140 /* Total number of elements [for entire chain] */ 141 u32 size; 142 143 enum qed_chain_use_mode intended_use; 144 145 bool b_external_pbl; 146 }; 147 148 struct qed_chain_init_params { 149 enum qed_chain_mode mode; 150 enum qed_chain_use_mode intended_use; 151 enum qed_chain_cnt_type cnt_type; 152 153 u32 page_size; 154 u32 num_elems; 155 size_t elem_size; 156 157 void *ext_pbl_virt; 158 dma_addr_t ext_pbl_phys; 159 }; 160 161 #define QED_CHAIN_PAGE_SIZE SZ_4K 162 163 #define ELEMS_PER_PAGE(elem_size, page_size) \ 164 ((page_size) / (elem_size)) 165 166 #define UNUSABLE_ELEMS_PER_PAGE(elem_size, mode) \ 167 (((mode) == QED_CHAIN_MODE_NEXT_PTR) ? \ 168 (u8)(1 + ((sizeof(struct qed_chain_next) - 1) / (elem_size))) : \ 169 0) 170 171 #define USABLE_ELEMS_PER_PAGE(elem_size, page_size, mode) \ 172 ((u32)(ELEMS_PER_PAGE((elem_size), (page_size)) - \ 173 UNUSABLE_ELEMS_PER_PAGE((elem_size), (mode)))) 174 175 #define QED_CHAIN_PAGE_CNT(elem_cnt, elem_size, page_size, mode) \ 176 DIV_ROUND_UP((elem_cnt), \ 177 USABLE_ELEMS_PER_PAGE((elem_size), (page_size), (mode))) 178 179 #define is_chain_u16(p) \ 180 ((p)->cnt_type == QED_CHAIN_CNT_TYPE_U16) 181 #define is_chain_u32(p) \ 182 ((p)->cnt_type == QED_CHAIN_CNT_TYPE_U32) 183 184 /* Accessors */ 185 186 static inline u16 qed_chain_get_prod_idx(const struct qed_chain *chain) 187 { 188 return chain->u.chain16.prod_idx; 189 } 190 191 static inline u16 qed_chain_get_cons_idx(const struct qed_chain *chain) 192 { 193 return chain->u.chain16.cons_idx; 194 } 195 196 static inline u32 qed_chain_get_prod_idx_u32(const struct qed_chain *chain) 197 { 198 return chain->u.chain32.prod_idx; 199 } 200 201 static inline u32 qed_chain_get_cons_idx_u32(const struct qed_chain *chain) 202 { 203 return chain->u.chain32.cons_idx; 204 } 205 206 static inline u16 qed_chain_get_elem_used(const struct qed_chain *chain) 207 { 208 u32 prod = qed_chain_get_prod_idx(chain); 209 u32 cons = qed_chain_get_cons_idx(chain); 210 u16 elem_per_page = chain->elem_per_page; 211 u16 used; 212 213 if (prod < cons) 214 prod += (u32)U16_MAX + 1; 215 216 used = (u16)(prod - cons); 217 if (chain->mode == QED_CHAIN_MODE_NEXT_PTR) 218 used -= (u16)(prod / elem_per_page - cons / elem_per_page); 219 220 return used; 221 } 222 223 static inline u16 qed_chain_get_elem_left(const struct qed_chain *chain) 224 { 225 return (u16)(chain->capacity - qed_chain_get_elem_used(chain)); 226 } 227 228 static inline u32 qed_chain_get_elem_used_u32(const struct qed_chain *chain) 229 { 230 u64 prod = qed_chain_get_prod_idx_u32(chain); 231 u64 cons = qed_chain_get_cons_idx_u32(chain); 232 u16 elem_per_page = chain->elem_per_page; 233 u32 used; 234 235 if (prod < cons) 236 prod += (u64)U32_MAX + 1; 237 238 used = (u32)(prod - cons); 239 if (chain->mode == QED_CHAIN_MODE_NEXT_PTR) 240 used -= (u32)(prod / elem_per_page - cons / elem_per_page); 241 242 return used; 243 } 244 245 static inline u32 qed_chain_get_elem_left_u32(const struct qed_chain *chain) 246 { 247 return chain->capacity - qed_chain_get_elem_used_u32(chain); 248 } 249 250 static inline u16 qed_chain_get_usable_per_page(const struct qed_chain *chain) 251 { 252 return chain->usable_per_page; 253 } 254 255 static inline u8 qed_chain_get_unusable_per_page(const struct qed_chain *chain) 256 { 257 return chain->elem_unusable; 258 } 259 260 static inline u32 qed_chain_get_page_cnt(const struct qed_chain *chain) 261 { 262 return chain->page_cnt; 263 } 264 265 static inline dma_addr_t qed_chain_get_pbl_phys(const struct qed_chain *chain) 266 { 267 return chain->pbl_sp.table_phys; 268 } 269 270 /** 271 * qed_chain_advance_page(): Advance the next element across pages for a 272 * linked chain. 273 * 274 * @p_chain: P_chain. 275 * @p_next_elem: P_next_elem. 276 * @idx_to_inc: Idx_to_inc. 277 * @page_to_inc: page_to_inc. 278 * 279 * Return: Void. 280 */ 281 static inline void 282 qed_chain_advance_page(struct qed_chain *p_chain, 283 void **p_next_elem, void *idx_to_inc, void *page_to_inc) 284 { 285 struct qed_chain_next *p_next = NULL; 286 u32 page_index = 0; 287 288 switch (p_chain->mode) { 289 case QED_CHAIN_MODE_NEXT_PTR: 290 p_next = *p_next_elem; 291 *p_next_elem = p_next->next_virt; 292 if (is_chain_u16(p_chain)) 293 *(u16 *)idx_to_inc += p_chain->elem_unusable; 294 else 295 *(u32 *)idx_to_inc += p_chain->elem_unusable; 296 break; 297 case QED_CHAIN_MODE_SINGLE: 298 *p_next_elem = p_chain->p_virt_addr; 299 break; 300 301 case QED_CHAIN_MODE_PBL: 302 if (is_chain_u16(p_chain)) { 303 if (++(*(u16 *)page_to_inc) == p_chain->page_cnt) 304 *(u16 *)page_to_inc = 0; 305 page_index = *(u16 *)page_to_inc; 306 } else { 307 if (++(*(u32 *)page_to_inc) == p_chain->page_cnt) 308 *(u32 *)page_to_inc = 0; 309 page_index = *(u32 *)page_to_inc; 310 } 311 *p_next_elem = p_chain->pbl.pp_addr_tbl[page_index].virt_addr; 312 } 313 } 314 315 #define is_unusable_idx(p, idx) \ 316 (((p)->u.chain16.idx & (p)->elem_per_page_mask) == (p)->usable_per_page) 317 318 #define is_unusable_idx_u32(p, idx) \ 319 (((p)->u.chain32.idx & (p)->elem_per_page_mask) == (p)->usable_per_page) 320 #define is_unusable_next_idx(p, idx) \ 321 ((((p)->u.chain16.idx + 1) & (p)->elem_per_page_mask) == \ 322 (p)->usable_per_page) 323 324 #define is_unusable_next_idx_u32(p, idx) \ 325 ((((p)->u.chain32.idx + 1) & (p)->elem_per_page_mask) == \ 326 (p)->usable_per_page) 327 328 #define test_and_skip(p, idx) \ 329 do { \ 330 if (is_chain_u16(p)) { \ 331 if (is_unusable_idx(p, idx)) \ 332 (p)->u.chain16.idx += (p)->elem_unusable; \ 333 } else { \ 334 if (is_unusable_idx_u32(p, idx)) \ 335 (p)->u.chain32.idx += (p)->elem_unusable; \ 336 } \ 337 } while (0) 338 339 /** 340 * qed_chain_return_produced(): A chain in which the driver "Produces" 341 * elements should use this API 342 * to indicate previous produced elements 343 * are now consumed. 344 * 345 * @p_chain: Chain. 346 * 347 * Return: Void. 348 */ 349 static inline void qed_chain_return_produced(struct qed_chain *p_chain) 350 { 351 if (is_chain_u16(p_chain)) 352 p_chain->u.chain16.cons_idx++; 353 else 354 p_chain->u.chain32.cons_idx++; 355 test_and_skip(p_chain, cons_idx); 356 } 357 358 /** 359 * qed_chain_produce(): A chain in which the driver "Produces" 360 * elements should use this to get a pointer to 361 * the next element which can be "Produced". It's driver 362 * responsibility to validate that the chain has room for 363 * new element. 364 * 365 * @p_chain: Chain. 366 * 367 * Return: void*, a pointer to next element. 368 */ 369 static inline void *qed_chain_produce(struct qed_chain *p_chain) 370 { 371 void *p_ret = NULL, *p_prod_idx, *p_prod_page_idx; 372 373 if (is_chain_u16(p_chain)) { 374 if ((p_chain->u.chain16.prod_idx & 375 p_chain->elem_per_page_mask) == p_chain->next_page_mask) { 376 p_prod_idx = &p_chain->u.chain16.prod_idx; 377 p_prod_page_idx = &p_chain->pbl.c.u16.prod_page_idx; 378 qed_chain_advance_page(p_chain, &p_chain->p_prod_elem, 379 p_prod_idx, p_prod_page_idx); 380 } 381 p_chain->u.chain16.prod_idx++; 382 } else { 383 if ((p_chain->u.chain32.prod_idx & 384 p_chain->elem_per_page_mask) == p_chain->next_page_mask) { 385 p_prod_idx = &p_chain->u.chain32.prod_idx; 386 p_prod_page_idx = &p_chain->pbl.c.u32.prod_page_idx; 387 qed_chain_advance_page(p_chain, &p_chain->p_prod_elem, 388 p_prod_idx, p_prod_page_idx); 389 } 390 p_chain->u.chain32.prod_idx++; 391 } 392 393 p_ret = p_chain->p_prod_elem; 394 p_chain->p_prod_elem = (void *)(((u8 *)p_chain->p_prod_elem) + 395 p_chain->elem_size); 396 397 return p_ret; 398 } 399 400 /** 401 * qed_chain_get_capacity(): Get the maximum number of BDs in chain 402 * 403 * @p_chain: Chain. 404 * 405 * Return: number of unusable BDs. 406 */ 407 static inline u32 qed_chain_get_capacity(struct qed_chain *p_chain) 408 { 409 return p_chain->capacity; 410 } 411 412 /** 413 * qed_chain_recycle_consumed(): Returns an element which was 414 * previously consumed; 415 * Increments producers so they could 416 * be written to FW. 417 * 418 * @p_chain: Chain. 419 * 420 * Return: Void. 421 */ 422 static inline void qed_chain_recycle_consumed(struct qed_chain *p_chain) 423 { 424 test_and_skip(p_chain, prod_idx); 425 if (is_chain_u16(p_chain)) 426 p_chain->u.chain16.prod_idx++; 427 else 428 p_chain->u.chain32.prod_idx++; 429 } 430 431 /** 432 * qed_chain_consume(): A Chain in which the driver utilizes data written 433 * by a different source (i.e., FW) should use this to 434 * access passed buffers. 435 * 436 * @p_chain: Chain. 437 * 438 * Return: void*, a pointer to the next buffer written. 439 */ 440 static inline void *qed_chain_consume(struct qed_chain *p_chain) 441 { 442 void *p_ret = NULL, *p_cons_idx, *p_cons_page_idx; 443 444 if (is_chain_u16(p_chain)) { 445 if ((p_chain->u.chain16.cons_idx & 446 p_chain->elem_per_page_mask) == p_chain->next_page_mask) { 447 p_cons_idx = &p_chain->u.chain16.cons_idx; 448 p_cons_page_idx = &p_chain->pbl.c.u16.cons_page_idx; 449 qed_chain_advance_page(p_chain, &p_chain->p_cons_elem, 450 p_cons_idx, p_cons_page_idx); 451 } 452 p_chain->u.chain16.cons_idx++; 453 } else { 454 if ((p_chain->u.chain32.cons_idx & 455 p_chain->elem_per_page_mask) == p_chain->next_page_mask) { 456 p_cons_idx = &p_chain->u.chain32.cons_idx; 457 p_cons_page_idx = &p_chain->pbl.c.u32.cons_page_idx; 458 qed_chain_advance_page(p_chain, &p_chain->p_cons_elem, 459 p_cons_idx, p_cons_page_idx); 460 } 461 p_chain->u.chain32.cons_idx++; 462 } 463 464 p_ret = p_chain->p_cons_elem; 465 p_chain->p_cons_elem = (void *)(((u8 *)p_chain->p_cons_elem) + 466 p_chain->elem_size); 467 468 return p_ret; 469 } 470 471 /** 472 * qed_chain_reset(): Resets the chain to its start state. 473 * 474 * @p_chain: pointer to a previously allocated chain. 475 * 476 * Return Void. 477 */ 478 static inline void qed_chain_reset(struct qed_chain *p_chain) 479 { 480 u32 i; 481 482 if (is_chain_u16(p_chain)) { 483 p_chain->u.chain16.prod_idx = 0; 484 p_chain->u.chain16.cons_idx = 0; 485 } else { 486 p_chain->u.chain32.prod_idx = 0; 487 p_chain->u.chain32.cons_idx = 0; 488 } 489 p_chain->p_cons_elem = p_chain->p_virt_addr; 490 p_chain->p_prod_elem = p_chain->p_virt_addr; 491 492 if (p_chain->mode == QED_CHAIN_MODE_PBL) { 493 /* Use (page_cnt - 1) as a reset value for the prod/cons page's 494 * indices, to avoid unnecessary page advancing on the first 495 * call to qed_chain_produce/consume. Instead, the indices 496 * will be advanced to page_cnt and then will be wrapped to 0. 497 */ 498 u32 reset_val = p_chain->page_cnt - 1; 499 500 if (is_chain_u16(p_chain)) { 501 p_chain->pbl.c.u16.prod_page_idx = (u16)reset_val; 502 p_chain->pbl.c.u16.cons_page_idx = (u16)reset_val; 503 } else { 504 p_chain->pbl.c.u32.prod_page_idx = reset_val; 505 p_chain->pbl.c.u32.cons_page_idx = reset_val; 506 } 507 } 508 509 switch (p_chain->intended_use) { 510 case QED_CHAIN_USE_TO_CONSUME: 511 /* produce empty elements */ 512 for (i = 0; i < p_chain->capacity; i++) 513 qed_chain_recycle_consumed(p_chain); 514 break; 515 516 case QED_CHAIN_USE_TO_CONSUME_PRODUCE: 517 case QED_CHAIN_USE_TO_PRODUCE: 518 default: 519 /* Do nothing */ 520 break; 521 } 522 } 523 524 /** 525 * qed_chain_get_last_elem(): Returns a pointer to the last element of the 526 * chain. 527 * 528 * @p_chain: Chain. 529 * 530 * Return: void*. 531 */ 532 static inline void *qed_chain_get_last_elem(struct qed_chain *p_chain) 533 { 534 struct qed_chain_next *p_next = NULL; 535 void *p_virt_addr = NULL; 536 u32 size, last_page_idx; 537 538 if (!p_chain->p_virt_addr) 539 goto out; 540 541 switch (p_chain->mode) { 542 case QED_CHAIN_MODE_NEXT_PTR: 543 size = p_chain->elem_size * p_chain->usable_per_page; 544 p_virt_addr = p_chain->p_virt_addr; 545 p_next = (struct qed_chain_next *)((u8 *)p_virt_addr + size); 546 while (p_next->next_virt != p_chain->p_virt_addr) { 547 p_virt_addr = p_next->next_virt; 548 p_next = (struct qed_chain_next *)((u8 *)p_virt_addr + 549 size); 550 } 551 break; 552 case QED_CHAIN_MODE_SINGLE: 553 p_virt_addr = p_chain->p_virt_addr; 554 break; 555 case QED_CHAIN_MODE_PBL: 556 last_page_idx = p_chain->page_cnt - 1; 557 p_virt_addr = p_chain->pbl.pp_addr_tbl[last_page_idx].virt_addr; 558 break; 559 } 560 /* p_virt_addr points at this stage to the last page of the chain */ 561 size = p_chain->elem_size * (p_chain->usable_per_page - 1); 562 p_virt_addr = (u8 *)p_virt_addr + size; 563 out: 564 return p_virt_addr; 565 } 566 567 /** 568 * qed_chain_set_prod(): sets the prod to the given value. 569 * 570 * @p_chain: Chain. 571 * @prod_idx: Prod Idx. 572 * @p_prod_elem: Prod elem. 573 * 574 * Return Void. 575 */ 576 static inline void qed_chain_set_prod(struct qed_chain *p_chain, 577 u32 prod_idx, void *p_prod_elem) 578 { 579 if (p_chain->mode == QED_CHAIN_MODE_PBL) { 580 u32 cur_prod, page_mask, page_cnt, page_diff; 581 582 cur_prod = is_chain_u16(p_chain) ? p_chain->u.chain16.prod_idx : 583 p_chain->u.chain32.prod_idx; 584 585 /* Assume that number of elements in a page is power of 2 */ 586 page_mask = ~p_chain->elem_per_page_mask; 587 588 /* Use "cur_prod - 1" and "prod_idx - 1" since producer index 589 * reaches the first element of next page before the page index 590 * is incremented. See qed_chain_produce(). 591 * Index wrap around is not a problem because the difference 592 * between current and given producer indices is always 593 * positive and lower than the chain's capacity. 594 */ 595 page_diff = (((cur_prod - 1) & page_mask) - 596 ((prod_idx - 1) & page_mask)) / 597 p_chain->elem_per_page; 598 599 page_cnt = qed_chain_get_page_cnt(p_chain); 600 if (is_chain_u16(p_chain)) 601 p_chain->pbl.c.u16.prod_page_idx = 602 (p_chain->pbl.c.u16.prod_page_idx - 603 page_diff + page_cnt) % page_cnt; 604 else 605 p_chain->pbl.c.u32.prod_page_idx = 606 (p_chain->pbl.c.u32.prod_page_idx - 607 page_diff + page_cnt) % page_cnt; 608 } 609 610 if (is_chain_u16(p_chain)) 611 p_chain->u.chain16.prod_idx = (u16) prod_idx; 612 else 613 p_chain->u.chain32.prod_idx = prod_idx; 614 p_chain->p_prod_elem = p_prod_elem; 615 } 616 617 /** 618 * qed_chain_pbl_zero_mem(): set chain memory to 0. 619 * 620 * @p_chain: Chain. 621 * 622 * Return: Void. 623 */ 624 static inline void qed_chain_pbl_zero_mem(struct qed_chain *p_chain) 625 { 626 u32 i, page_cnt; 627 628 if (p_chain->mode != QED_CHAIN_MODE_PBL) 629 return; 630 631 page_cnt = qed_chain_get_page_cnt(p_chain); 632 633 for (i = 0; i < page_cnt; i++) 634 memset(p_chain->pbl.pp_addr_tbl[i].virt_addr, 0, 635 p_chain->page_size); 636 } 637 638 #endif 639