1 /* 2 * Copyright 2015 Amazon.com, Inc. or its affiliates. 3 * 4 * This software is available to you under a choice of one of two 5 * licenses. You may choose to be licensed under the terms of the GNU 6 * General Public License (GPL) Version 2, available from the file 7 * COPYING in the main directory of this source tree, or the 8 * BSD license below: 9 * 10 * Redistribution and use in source and binary forms, with or 11 * without modification, are permitted provided that the following 12 * conditions are met: 13 * 14 * - Redistributions of source code must retain the above 15 * copyright notice, this list of conditions and the following 16 * disclaimer. 17 * 18 * - Redistributions in binary form must reproduce the above 19 * copyright notice, this list of conditions and the following 20 * disclaimer in the documentation and/or other materials 21 * provided with the distribution. 22 * 23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 30 * SOFTWARE. 31 */ 32 33 #include "ena_eth_com.h" 34 35 static struct ena_eth_io_rx_cdesc_base *ena_com_get_next_rx_cdesc( 36 struct ena_com_io_cq *io_cq) 37 { 38 struct ena_eth_io_rx_cdesc_base *cdesc; 39 u16 expected_phase, head_masked; 40 u16 desc_phase; 41 42 head_masked = io_cq->head & (io_cq->q_depth - 1); 43 expected_phase = io_cq->phase; 44 45 cdesc = (struct ena_eth_io_rx_cdesc_base *)(io_cq->cdesc_addr.virt_addr 46 + (head_masked * io_cq->cdesc_entry_size_in_bytes)); 47 48 desc_phase = (READ_ONCE(cdesc->status) & ENA_ETH_IO_RX_CDESC_BASE_PHASE_MASK) >> 49 ENA_ETH_IO_RX_CDESC_BASE_PHASE_SHIFT; 50 51 if (desc_phase != expected_phase) 52 return NULL; 53 54 /* Make sure we read the rest of the descriptor after the phase bit 55 * has been read 56 */ 57 dma_rmb(); 58 59 return cdesc; 60 } 61 62 static void *get_sq_desc_regular_queue(struct ena_com_io_sq *io_sq) 63 { 64 u16 tail_masked; 65 u32 offset; 66 67 tail_masked = io_sq->tail & (io_sq->q_depth - 1); 68 69 offset = tail_masked * io_sq->desc_entry_size; 70 71 return (void *)((uintptr_t)io_sq->desc_addr.virt_addr + offset); 72 } 73 74 static int ena_com_write_bounce_buffer_to_dev(struct ena_com_io_sq *io_sq, 75 u8 *bounce_buffer) 76 { 77 struct ena_com_llq_info *llq_info = &io_sq->llq_info; 78 79 u16 dst_tail_mask; 80 u32 dst_offset; 81 82 dst_tail_mask = io_sq->tail & (io_sq->q_depth - 1); 83 dst_offset = dst_tail_mask * llq_info->desc_list_entry_size; 84 85 if (is_llq_max_tx_burst_exists(io_sq)) { 86 if (unlikely(!io_sq->entries_in_tx_burst_left)) { 87 pr_err("Error: trying to send more packets than tx burst allows\n"); 88 return -ENOSPC; 89 } 90 91 io_sq->entries_in_tx_burst_left--; 92 pr_debug("decreasing entries_in_tx_burst_left of queue %d to %d\n", 93 io_sq->qid, io_sq->entries_in_tx_burst_left); 94 } 95 96 /* Make sure everything was written into the bounce buffer before 97 * writing the bounce buffer to the device 98 */ 99 wmb(); 100 101 /* The line is completed. Copy it to dev */ 102 __iowrite64_copy(io_sq->desc_addr.pbuf_dev_addr + dst_offset, 103 bounce_buffer, (llq_info->desc_list_entry_size) / 8); 104 105 io_sq->tail++; 106 107 /* Switch phase bit in case of wrap around */ 108 if (unlikely((io_sq->tail & (io_sq->q_depth - 1)) == 0)) 109 io_sq->phase ^= 1; 110 111 return 0; 112 } 113 114 static int ena_com_write_header_to_bounce(struct ena_com_io_sq *io_sq, 115 u8 *header_src, 116 u16 header_len) 117 { 118 struct ena_com_llq_pkt_ctrl *pkt_ctrl = &io_sq->llq_buf_ctrl; 119 struct ena_com_llq_info *llq_info = &io_sq->llq_info; 120 u8 *bounce_buffer = pkt_ctrl->curr_bounce_buf; 121 u16 header_offset; 122 123 if (unlikely(io_sq->mem_queue_type == ENA_ADMIN_PLACEMENT_POLICY_HOST)) 124 return 0; 125 126 header_offset = 127 llq_info->descs_num_before_header * io_sq->desc_entry_size; 128 129 if (unlikely((header_offset + header_len) > 130 llq_info->desc_list_entry_size)) { 131 pr_err("trying to write header larger than llq entry can accommodate\n"); 132 return -EFAULT; 133 } 134 135 if (unlikely(!bounce_buffer)) { 136 pr_err("bounce buffer is NULL\n"); 137 return -EFAULT; 138 } 139 140 memcpy(bounce_buffer + header_offset, header_src, header_len); 141 142 return 0; 143 } 144 145 static void *get_sq_desc_llq(struct ena_com_io_sq *io_sq) 146 { 147 struct ena_com_llq_pkt_ctrl *pkt_ctrl = &io_sq->llq_buf_ctrl; 148 u8 *bounce_buffer; 149 void *sq_desc; 150 151 bounce_buffer = pkt_ctrl->curr_bounce_buf; 152 153 if (unlikely(!bounce_buffer)) { 154 pr_err("bounce buffer is NULL\n"); 155 return NULL; 156 } 157 158 sq_desc = bounce_buffer + pkt_ctrl->idx * io_sq->desc_entry_size; 159 pkt_ctrl->idx++; 160 pkt_ctrl->descs_left_in_line--; 161 162 return sq_desc; 163 } 164 165 static int ena_com_close_bounce_buffer(struct ena_com_io_sq *io_sq) 166 { 167 struct ena_com_llq_pkt_ctrl *pkt_ctrl = &io_sq->llq_buf_ctrl; 168 struct ena_com_llq_info *llq_info = &io_sq->llq_info; 169 int rc; 170 171 if (unlikely(io_sq->mem_queue_type == ENA_ADMIN_PLACEMENT_POLICY_HOST)) 172 return 0; 173 174 /* bounce buffer was used, so write it and get a new one */ 175 if (pkt_ctrl->idx) { 176 rc = ena_com_write_bounce_buffer_to_dev(io_sq, 177 pkt_ctrl->curr_bounce_buf); 178 if (unlikely(rc)) 179 return rc; 180 181 pkt_ctrl->curr_bounce_buf = 182 ena_com_get_next_bounce_buffer(&io_sq->bounce_buf_ctrl); 183 memset(io_sq->llq_buf_ctrl.curr_bounce_buf, 184 0x0, llq_info->desc_list_entry_size); 185 } 186 187 pkt_ctrl->idx = 0; 188 pkt_ctrl->descs_left_in_line = llq_info->descs_num_before_header; 189 return 0; 190 } 191 192 static void *get_sq_desc(struct ena_com_io_sq *io_sq) 193 { 194 if (io_sq->mem_queue_type == ENA_ADMIN_PLACEMENT_POLICY_DEV) 195 return get_sq_desc_llq(io_sq); 196 197 return get_sq_desc_regular_queue(io_sq); 198 } 199 200 static int ena_com_sq_update_llq_tail(struct ena_com_io_sq *io_sq) 201 { 202 struct ena_com_llq_pkt_ctrl *pkt_ctrl = &io_sq->llq_buf_ctrl; 203 struct ena_com_llq_info *llq_info = &io_sq->llq_info; 204 int rc; 205 206 if (!pkt_ctrl->descs_left_in_line) { 207 rc = ena_com_write_bounce_buffer_to_dev(io_sq, 208 pkt_ctrl->curr_bounce_buf); 209 if (unlikely(rc)) 210 return rc; 211 212 pkt_ctrl->curr_bounce_buf = 213 ena_com_get_next_bounce_buffer(&io_sq->bounce_buf_ctrl); 214 memset(io_sq->llq_buf_ctrl.curr_bounce_buf, 215 0x0, llq_info->desc_list_entry_size); 216 217 pkt_ctrl->idx = 0; 218 if (unlikely(llq_info->desc_stride_ctrl == ENA_ADMIN_SINGLE_DESC_PER_ENTRY)) 219 pkt_ctrl->descs_left_in_line = 1; 220 else 221 pkt_ctrl->descs_left_in_line = 222 llq_info->desc_list_entry_size / io_sq->desc_entry_size; 223 } 224 225 return 0; 226 } 227 228 static int ena_com_sq_update_tail(struct ena_com_io_sq *io_sq) 229 { 230 if (io_sq->mem_queue_type == ENA_ADMIN_PLACEMENT_POLICY_DEV) 231 return ena_com_sq_update_llq_tail(io_sq); 232 233 io_sq->tail++; 234 235 /* Switch phase bit in case of wrap around */ 236 if (unlikely((io_sq->tail & (io_sq->q_depth - 1)) == 0)) 237 io_sq->phase ^= 1; 238 239 return 0; 240 } 241 242 static struct ena_eth_io_rx_cdesc_base * 243 ena_com_rx_cdesc_idx_to_ptr(struct ena_com_io_cq *io_cq, u16 idx) 244 { 245 idx &= (io_cq->q_depth - 1); 246 return (struct ena_eth_io_rx_cdesc_base *) 247 ((uintptr_t)io_cq->cdesc_addr.virt_addr + 248 idx * io_cq->cdesc_entry_size_in_bytes); 249 } 250 251 static u16 ena_com_cdesc_rx_pkt_get(struct ena_com_io_cq *io_cq, 252 u16 *first_cdesc_idx) 253 { 254 struct ena_eth_io_rx_cdesc_base *cdesc; 255 u16 count = 0, head_masked; 256 u32 last = 0; 257 258 do { 259 cdesc = ena_com_get_next_rx_cdesc(io_cq); 260 if (!cdesc) 261 break; 262 263 ena_com_cq_inc_head(io_cq); 264 count++; 265 last = (READ_ONCE(cdesc->status) & ENA_ETH_IO_RX_CDESC_BASE_LAST_MASK) >> 266 ENA_ETH_IO_RX_CDESC_BASE_LAST_SHIFT; 267 } while (!last); 268 269 if (last) { 270 *first_cdesc_idx = io_cq->cur_rx_pkt_cdesc_start_idx; 271 count += io_cq->cur_rx_pkt_cdesc_count; 272 273 head_masked = io_cq->head & (io_cq->q_depth - 1); 274 275 io_cq->cur_rx_pkt_cdesc_count = 0; 276 io_cq->cur_rx_pkt_cdesc_start_idx = head_masked; 277 278 pr_debug("ena q_id: %d packets were completed. first desc idx %u descs# %d\n", 279 io_cq->qid, *first_cdesc_idx, count); 280 } else { 281 io_cq->cur_rx_pkt_cdesc_count += count; 282 count = 0; 283 } 284 285 return count; 286 } 287 288 static int ena_com_create_and_store_tx_meta_desc(struct ena_com_io_sq *io_sq, 289 struct ena_com_tx_ctx *ena_tx_ctx) 290 { 291 struct ena_eth_io_tx_meta_desc *meta_desc = NULL; 292 struct ena_com_tx_meta *ena_meta = &ena_tx_ctx->ena_meta; 293 294 meta_desc = get_sq_desc(io_sq); 295 memset(meta_desc, 0x0, sizeof(struct ena_eth_io_tx_meta_desc)); 296 297 meta_desc->len_ctrl |= ENA_ETH_IO_TX_META_DESC_META_DESC_MASK; 298 299 meta_desc->len_ctrl |= ENA_ETH_IO_TX_META_DESC_EXT_VALID_MASK; 300 301 /* bits 0-9 of the mss */ 302 meta_desc->word2 |= (ena_meta->mss << 303 ENA_ETH_IO_TX_META_DESC_MSS_LO_SHIFT) & 304 ENA_ETH_IO_TX_META_DESC_MSS_LO_MASK; 305 /* bits 10-13 of the mss */ 306 meta_desc->len_ctrl |= ((ena_meta->mss >> 10) << 307 ENA_ETH_IO_TX_META_DESC_MSS_HI_SHIFT) & 308 ENA_ETH_IO_TX_META_DESC_MSS_HI_MASK; 309 310 /* Extended meta desc */ 311 meta_desc->len_ctrl |= ENA_ETH_IO_TX_META_DESC_ETH_META_TYPE_MASK; 312 meta_desc->len_ctrl |= ENA_ETH_IO_TX_META_DESC_META_STORE_MASK; 313 meta_desc->len_ctrl |= (io_sq->phase << 314 ENA_ETH_IO_TX_META_DESC_PHASE_SHIFT) & 315 ENA_ETH_IO_TX_META_DESC_PHASE_MASK; 316 317 meta_desc->len_ctrl |= ENA_ETH_IO_TX_META_DESC_FIRST_MASK; 318 meta_desc->word2 |= ena_meta->l3_hdr_len & 319 ENA_ETH_IO_TX_META_DESC_L3_HDR_LEN_MASK; 320 meta_desc->word2 |= (ena_meta->l3_hdr_offset << 321 ENA_ETH_IO_TX_META_DESC_L3_HDR_OFF_SHIFT) & 322 ENA_ETH_IO_TX_META_DESC_L3_HDR_OFF_MASK; 323 324 meta_desc->word2 |= (ena_meta->l4_hdr_len << 325 ENA_ETH_IO_TX_META_DESC_L4_HDR_LEN_IN_WORDS_SHIFT) & 326 ENA_ETH_IO_TX_META_DESC_L4_HDR_LEN_IN_WORDS_MASK; 327 328 meta_desc->len_ctrl |= ENA_ETH_IO_TX_META_DESC_META_STORE_MASK; 329 330 /* Cached the meta desc */ 331 memcpy(&io_sq->cached_tx_meta, ena_meta, 332 sizeof(struct ena_com_tx_meta)); 333 334 return ena_com_sq_update_tail(io_sq); 335 } 336 337 static void ena_com_rx_set_flags(struct ena_com_rx_ctx *ena_rx_ctx, 338 struct ena_eth_io_rx_cdesc_base *cdesc) 339 { 340 ena_rx_ctx->l3_proto = cdesc->status & 341 ENA_ETH_IO_RX_CDESC_BASE_L3_PROTO_IDX_MASK; 342 ena_rx_ctx->l4_proto = 343 (cdesc->status & ENA_ETH_IO_RX_CDESC_BASE_L4_PROTO_IDX_MASK) >> 344 ENA_ETH_IO_RX_CDESC_BASE_L4_PROTO_IDX_SHIFT; 345 ena_rx_ctx->l3_csum_err = 346 !!((cdesc->status & ENA_ETH_IO_RX_CDESC_BASE_L3_CSUM_ERR_MASK) >> 347 ENA_ETH_IO_RX_CDESC_BASE_L3_CSUM_ERR_SHIFT); 348 ena_rx_ctx->l4_csum_err = 349 !!((cdesc->status & ENA_ETH_IO_RX_CDESC_BASE_L4_CSUM_ERR_MASK) >> 350 ENA_ETH_IO_RX_CDESC_BASE_L4_CSUM_ERR_SHIFT); 351 ena_rx_ctx->l4_csum_checked = 352 !!((cdesc->status & ENA_ETH_IO_RX_CDESC_BASE_L4_CSUM_CHECKED_MASK) >> 353 ENA_ETH_IO_RX_CDESC_BASE_L4_CSUM_CHECKED_SHIFT); 354 ena_rx_ctx->hash = cdesc->hash; 355 ena_rx_ctx->frag = 356 (cdesc->status & ENA_ETH_IO_RX_CDESC_BASE_IPV4_FRAG_MASK) >> 357 ENA_ETH_IO_RX_CDESC_BASE_IPV4_FRAG_SHIFT; 358 359 pr_debug("ena_rx_ctx->l3_proto %d ena_rx_ctx->l4_proto %d\nena_rx_ctx->l3_csum_err %d ena_rx_ctx->l4_csum_err %d\nhash frag %d frag: %d cdesc_status: %x\n", 360 ena_rx_ctx->l3_proto, ena_rx_ctx->l4_proto, 361 ena_rx_ctx->l3_csum_err, ena_rx_ctx->l4_csum_err, 362 ena_rx_ctx->hash, ena_rx_ctx->frag, cdesc->status); 363 } 364 365 /*****************************************************************************/ 366 /***************************** API **********************************/ 367 /*****************************************************************************/ 368 369 int ena_com_prepare_tx(struct ena_com_io_sq *io_sq, 370 struct ena_com_tx_ctx *ena_tx_ctx, 371 int *nb_hw_desc) 372 { 373 struct ena_eth_io_tx_desc *desc = NULL; 374 struct ena_com_buf *ena_bufs = ena_tx_ctx->ena_bufs; 375 void *buffer_to_push = ena_tx_ctx->push_header; 376 u16 header_len = ena_tx_ctx->header_len; 377 u16 num_bufs = ena_tx_ctx->num_bufs; 378 u16 start_tail = io_sq->tail; 379 int i, rc; 380 bool have_meta; 381 u64 addr_hi; 382 383 WARN(io_sq->direction != ENA_COM_IO_QUEUE_DIRECTION_TX, "wrong Q type"); 384 385 /* num_bufs +1 for potential meta desc */ 386 if (unlikely(!ena_com_sq_have_enough_space(io_sq, num_bufs + 1))) { 387 pr_debug("Not enough space in the tx queue\n"); 388 return -ENOMEM; 389 } 390 391 if (unlikely(header_len > io_sq->tx_max_header_size)) { 392 pr_err("header size is too large %d max header: %d\n", 393 header_len, io_sq->tx_max_header_size); 394 return -EINVAL; 395 } 396 397 if (unlikely(io_sq->mem_queue_type == ENA_ADMIN_PLACEMENT_POLICY_DEV && 398 !buffer_to_push)) 399 return -EINVAL; 400 401 rc = ena_com_write_header_to_bounce(io_sq, buffer_to_push, header_len); 402 if (unlikely(rc)) 403 return rc; 404 405 have_meta = ena_tx_ctx->meta_valid && ena_com_meta_desc_changed(io_sq, 406 ena_tx_ctx); 407 if (have_meta) { 408 rc = ena_com_create_and_store_tx_meta_desc(io_sq, ena_tx_ctx); 409 if (unlikely(rc)) 410 return rc; 411 } 412 413 /* If the caller doesn't want to send packets */ 414 if (unlikely(!num_bufs && !header_len)) { 415 rc = ena_com_close_bounce_buffer(io_sq); 416 *nb_hw_desc = io_sq->tail - start_tail; 417 return rc; 418 } 419 420 desc = get_sq_desc(io_sq); 421 if (unlikely(!desc)) 422 return -EFAULT; 423 memset(desc, 0x0, sizeof(struct ena_eth_io_tx_desc)); 424 425 /* Set first desc when we don't have meta descriptor */ 426 if (!have_meta) 427 desc->len_ctrl |= ENA_ETH_IO_TX_DESC_FIRST_MASK; 428 429 desc->buff_addr_hi_hdr_sz |= (header_len << 430 ENA_ETH_IO_TX_DESC_HEADER_LENGTH_SHIFT) & 431 ENA_ETH_IO_TX_DESC_HEADER_LENGTH_MASK; 432 desc->len_ctrl |= (io_sq->phase << ENA_ETH_IO_TX_DESC_PHASE_SHIFT) & 433 ENA_ETH_IO_TX_DESC_PHASE_MASK; 434 435 desc->len_ctrl |= ENA_ETH_IO_TX_DESC_COMP_REQ_MASK; 436 437 /* Bits 0-9 */ 438 desc->meta_ctrl |= (ena_tx_ctx->req_id << 439 ENA_ETH_IO_TX_DESC_REQ_ID_LO_SHIFT) & 440 ENA_ETH_IO_TX_DESC_REQ_ID_LO_MASK; 441 442 desc->meta_ctrl |= (ena_tx_ctx->df << 443 ENA_ETH_IO_TX_DESC_DF_SHIFT) & 444 ENA_ETH_IO_TX_DESC_DF_MASK; 445 446 /* Bits 10-15 */ 447 desc->len_ctrl |= ((ena_tx_ctx->req_id >> 10) << 448 ENA_ETH_IO_TX_DESC_REQ_ID_HI_SHIFT) & 449 ENA_ETH_IO_TX_DESC_REQ_ID_HI_MASK; 450 451 if (ena_tx_ctx->meta_valid) { 452 desc->meta_ctrl |= (ena_tx_ctx->tso_enable << 453 ENA_ETH_IO_TX_DESC_TSO_EN_SHIFT) & 454 ENA_ETH_IO_TX_DESC_TSO_EN_MASK; 455 desc->meta_ctrl |= ena_tx_ctx->l3_proto & 456 ENA_ETH_IO_TX_DESC_L3_PROTO_IDX_MASK; 457 desc->meta_ctrl |= (ena_tx_ctx->l4_proto << 458 ENA_ETH_IO_TX_DESC_L4_PROTO_IDX_SHIFT) & 459 ENA_ETH_IO_TX_DESC_L4_PROTO_IDX_MASK; 460 desc->meta_ctrl |= (ena_tx_ctx->l3_csum_enable << 461 ENA_ETH_IO_TX_DESC_L3_CSUM_EN_SHIFT) & 462 ENA_ETH_IO_TX_DESC_L3_CSUM_EN_MASK; 463 desc->meta_ctrl |= (ena_tx_ctx->l4_csum_enable << 464 ENA_ETH_IO_TX_DESC_L4_CSUM_EN_SHIFT) & 465 ENA_ETH_IO_TX_DESC_L4_CSUM_EN_MASK; 466 desc->meta_ctrl |= (ena_tx_ctx->l4_csum_partial << 467 ENA_ETH_IO_TX_DESC_L4_CSUM_PARTIAL_SHIFT) & 468 ENA_ETH_IO_TX_DESC_L4_CSUM_PARTIAL_MASK; 469 } 470 471 for (i = 0; i < num_bufs; i++) { 472 /* The first desc share the same desc as the header */ 473 if (likely(i != 0)) { 474 rc = ena_com_sq_update_tail(io_sq); 475 if (unlikely(rc)) 476 return rc; 477 478 desc = get_sq_desc(io_sq); 479 if (unlikely(!desc)) 480 return -EFAULT; 481 482 memset(desc, 0x0, sizeof(struct ena_eth_io_tx_desc)); 483 484 desc->len_ctrl |= (io_sq->phase << 485 ENA_ETH_IO_TX_DESC_PHASE_SHIFT) & 486 ENA_ETH_IO_TX_DESC_PHASE_MASK; 487 } 488 489 desc->len_ctrl |= ena_bufs->len & 490 ENA_ETH_IO_TX_DESC_LENGTH_MASK; 491 492 addr_hi = ((ena_bufs->paddr & 493 GENMASK_ULL(io_sq->dma_addr_bits - 1, 32)) >> 32); 494 495 desc->buff_addr_lo = (u32)ena_bufs->paddr; 496 desc->buff_addr_hi_hdr_sz |= addr_hi & 497 ENA_ETH_IO_TX_DESC_ADDR_HI_MASK; 498 ena_bufs++; 499 } 500 501 /* set the last desc indicator */ 502 desc->len_ctrl |= ENA_ETH_IO_TX_DESC_LAST_MASK; 503 504 rc = ena_com_sq_update_tail(io_sq); 505 if (unlikely(rc)) 506 return rc; 507 508 rc = ena_com_close_bounce_buffer(io_sq); 509 510 *nb_hw_desc = io_sq->tail - start_tail; 511 return rc; 512 } 513 514 int ena_com_rx_pkt(struct ena_com_io_cq *io_cq, 515 struct ena_com_io_sq *io_sq, 516 struct ena_com_rx_ctx *ena_rx_ctx) 517 { 518 struct ena_com_rx_buf_info *ena_buf = &ena_rx_ctx->ena_bufs[0]; 519 struct ena_eth_io_rx_cdesc_base *cdesc = NULL; 520 u16 cdesc_idx = 0; 521 u16 nb_hw_desc; 522 u16 i = 0; 523 524 WARN(io_cq->direction != ENA_COM_IO_QUEUE_DIRECTION_RX, "wrong Q type"); 525 526 nb_hw_desc = ena_com_cdesc_rx_pkt_get(io_cq, &cdesc_idx); 527 if (nb_hw_desc == 0) { 528 ena_rx_ctx->descs = nb_hw_desc; 529 return 0; 530 } 531 532 pr_debug("fetch rx packet: queue %d completed desc: %d\n", io_cq->qid, 533 nb_hw_desc); 534 535 if (unlikely(nb_hw_desc > ena_rx_ctx->max_bufs)) { 536 pr_err("Too many RX cdescs (%d) > MAX(%d)\n", nb_hw_desc, 537 ena_rx_ctx->max_bufs); 538 return -ENOSPC; 539 } 540 541 cdesc = ena_com_rx_cdesc_idx_to_ptr(io_cq, cdesc_idx); 542 ena_rx_ctx->pkt_offset = cdesc->offset; 543 544 do { 545 ena_buf[i].len = cdesc->length; 546 ena_buf[i].req_id = cdesc->req_id; 547 548 if (++i >= nb_hw_desc) 549 break; 550 551 cdesc = ena_com_rx_cdesc_idx_to_ptr(io_cq, cdesc_idx + i); 552 553 } while (1); 554 555 /* Update SQ head ptr */ 556 io_sq->next_to_comp += nb_hw_desc; 557 558 pr_debug("[%s][QID#%d] Updating SQ head to: %d\n", __func__, io_sq->qid, 559 io_sq->next_to_comp); 560 561 /* Get rx flags from the last pkt */ 562 ena_com_rx_set_flags(ena_rx_ctx, cdesc); 563 564 ena_rx_ctx->descs = nb_hw_desc; 565 return 0; 566 } 567 568 int ena_com_add_single_rx_desc(struct ena_com_io_sq *io_sq, 569 struct ena_com_buf *ena_buf, 570 u16 req_id) 571 { 572 struct ena_eth_io_rx_desc *desc; 573 574 WARN(io_sq->direction != ENA_COM_IO_QUEUE_DIRECTION_RX, "wrong Q type"); 575 576 if (unlikely(!ena_com_sq_have_enough_space(io_sq, 1))) 577 return -ENOSPC; 578 579 desc = get_sq_desc(io_sq); 580 if (unlikely(!desc)) 581 return -EFAULT; 582 583 memset(desc, 0x0, sizeof(struct ena_eth_io_rx_desc)); 584 585 desc->length = ena_buf->len; 586 587 desc->ctrl = ENA_ETH_IO_RX_DESC_FIRST_MASK | 588 ENA_ETH_IO_RX_DESC_LAST_MASK | 589 (io_sq->phase & ENA_ETH_IO_RX_DESC_PHASE_MASK) | 590 ENA_ETH_IO_RX_DESC_COMP_REQ_MASK; 591 592 desc->req_id = req_id; 593 594 desc->buff_addr_lo = (u32)ena_buf->paddr; 595 desc->buff_addr_hi = 596 ((ena_buf->paddr & GENMASK_ULL(io_sq->dma_addr_bits - 1, 32)) >> 32); 597 598 return ena_com_sq_update_tail(io_sq); 599 } 600 601 bool ena_com_cq_empty(struct ena_com_io_cq *io_cq) 602 { 603 struct ena_eth_io_rx_cdesc_base *cdesc; 604 605 cdesc = ena_com_get_next_rx_cdesc(io_cq); 606 if (cdesc) 607 return false; 608 else 609 return true; 610 } 611