1 /*- 2 * BSD LICENSE 3 * 4 * Copyright (c) 2015-2020 Amazon.com, Inc. or its affiliates. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 */ 30 #include <sys/cdefs.h> 31 __FBSDID("$FreeBSD$"); 32 33 #ifdef DEV_NETMAP 34 35 #include "ena.h" 36 #include "ena_netmap.h" 37 38 #define ENA_NETMAP_MORE_FRAMES 1 39 #define ENA_NETMAP_NO_MORE_FRAMES 0 40 #define ENA_MAX_FRAMES 16384 41 42 struct ena_netmap_ctx { 43 struct netmap_kring *kring; 44 struct ena_adapter *adapter; 45 struct netmap_adapter *na; 46 struct netmap_slot *slots; 47 struct ena_ring *ring; 48 struct ena_com_io_cq *io_cq; 49 struct ena_com_io_sq *io_sq; 50 u_int nm_i; 51 uint16_t nt; 52 uint16_t lim; 53 }; 54 55 /* Netmap callbacks */ 56 static int ena_netmap_reg(struct netmap_adapter *, int); 57 static int ena_netmap_txsync(struct netmap_kring *, int); 58 static int ena_netmap_rxsync(struct netmap_kring *, int); 59 60 /* Helper functions */ 61 static int ena_netmap_tx_frames(struct ena_netmap_ctx *); 62 static int ena_netmap_tx_frame(struct ena_netmap_ctx *); 63 static inline uint16_t ena_netmap_count_slots(struct ena_netmap_ctx *); 64 static inline uint16_t ena_netmap_packet_len(struct netmap_slot *, u_int, 65 uint16_t); 66 static int ena_netmap_copy_data(struct netmap_adapter *, 67 struct netmap_slot *, u_int, uint16_t, uint16_t, void *); 68 static int ena_netmap_map_single_slot(struct netmap_adapter *, 69 struct netmap_slot *, bus_dma_tag_t, bus_dmamap_t, void **, uint64_t *); 70 static int ena_netmap_tx_map_slots(struct ena_netmap_ctx *, 71 struct ena_tx_buffer *, void **, uint16_t *, uint16_t *); 72 static void ena_netmap_unmap_last_socket_chain(struct ena_netmap_ctx *, 73 struct ena_tx_buffer *); 74 static void ena_netmap_tx_cleanup(struct ena_netmap_ctx *); 75 static uint16_t ena_netmap_tx_clean_one(struct ena_netmap_ctx *, 76 uint16_t); 77 static inline int validate_tx_req_id(struct ena_ring *, uint16_t); 78 static int ena_netmap_rx_frames(struct ena_netmap_ctx *); 79 static int ena_netmap_rx_frame(struct ena_netmap_ctx *); 80 static int ena_netmap_rx_load_desc(struct ena_netmap_ctx *, uint16_t, 81 int *); 82 static void ena_netmap_rx_cleanup(struct ena_netmap_ctx *); 83 static void ena_netmap_fill_ctx(struct netmap_kring *, 84 struct ena_netmap_ctx *, uint16_t); 85 86 int 87 ena_netmap_attach(struct ena_adapter *adapter) 88 { 89 struct netmap_adapter na; 90 91 ena_trace(ENA_NETMAP, "netmap attach\n"); 92 93 bzero(&na, sizeof(na)); 94 na.na_flags = NAF_MOREFRAG; 95 na.ifp = adapter->ifp; 96 na.num_tx_desc = adapter->requested_tx_ring_size; 97 na.num_rx_desc = adapter->requested_rx_ring_size; 98 na.num_tx_rings = adapter->num_io_queues; 99 na.num_rx_rings = adapter->num_io_queues; 100 na.rx_buf_maxsize = adapter->buf_ring_size; 101 na.nm_txsync = ena_netmap_txsync; 102 na.nm_rxsync = ena_netmap_rxsync; 103 na.nm_register = ena_netmap_reg; 104 105 return (netmap_attach(&na)); 106 } 107 108 int 109 ena_netmap_alloc_rx_slot(struct ena_adapter *adapter, 110 struct ena_ring *rx_ring, struct ena_rx_buffer *rx_info) 111 { 112 struct netmap_adapter *na = NA(adapter->ifp); 113 struct netmap_kring *kring; 114 struct netmap_ring *ring; 115 struct netmap_slot *slot; 116 void *addr; 117 uint64_t paddr; 118 int nm_i, qid, head, lim, rc; 119 120 /* if previously allocated frag is not used */ 121 if (unlikely(rx_info->netmap_buf_idx != 0)) 122 return (0); 123 124 qid = rx_ring->qid; 125 kring = na->rx_rings[qid]; 126 nm_i = kring->nr_hwcur; 127 head = kring->rhead; 128 129 ena_trace(ENA_NETMAP | ENA_DBG, "nr_hwcur: %d, nr_hwtail: %d, " 130 "rhead: %d, rcur: %d, rtail: %d\n", kring->nr_hwcur, 131 kring->nr_hwtail, kring->rhead, kring->rcur, kring->rtail); 132 133 if ((nm_i == head) && rx_ring->initialized) { 134 ena_trace(ENA_NETMAP, "No free slots in netmap ring\n"); 135 return (ENOMEM); 136 } 137 138 ring = kring->ring; 139 if (ring == NULL) { 140 device_printf(adapter->pdev, "Rx ring %d is NULL\n", qid); 141 return (EFAULT); 142 } 143 slot = &ring->slot[nm_i]; 144 145 addr = PNMB(na, slot, &paddr); 146 if (addr == NETMAP_BUF_BASE(na)) { 147 device_printf(adapter->pdev, "Bad buff in slot\n"); 148 return (EFAULT); 149 } 150 151 rc = netmap_load_map(na, adapter->rx_buf_tag, rx_info->map, addr); 152 if (rc != 0) { 153 ena_trace(ENA_WARNING, "DMA mapping error\n"); 154 return (rc); 155 } 156 bus_dmamap_sync(adapter->rx_buf_tag, rx_info->map, BUS_DMASYNC_PREREAD); 157 158 rx_info->ena_buf.paddr = paddr; 159 rx_info->ena_buf.len = ring->nr_buf_size; 160 rx_info->mbuf = NULL; 161 rx_info->netmap_buf_idx = slot->buf_idx; 162 163 slot->buf_idx = 0; 164 165 lim = kring->nkr_num_slots - 1; 166 kring->nr_hwcur = nm_next(nm_i, lim); 167 168 return (0); 169 } 170 171 void 172 ena_netmap_free_rx_slot(struct ena_adapter *adapter, 173 struct ena_ring *rx_ring, struct ena_rx_buffer *rx_info) 174 { 175 struct netmap_adapter *na; 176 struct netmap_kring *kring; 177 struct netmap_slot *slot; 178 int nm_i, qid, lim; 179 180 na = NA(adapter->ifp); 181 if (na == NULL) { 182 device_printf(adapter->pdev, "netmap adapter is NULL\n"); 183 return; 184 } 185 186 if (na->rx_rings == NULL) { 187 device_printf(adapter->pdev, "netmap rings are NULL\n"); 188 return; 189 } 190 191 qid = rx_ring->qid; 192 kring = na->rx_rings[qid]; 193 if (kring == NULL) { 194 device_printf(adapter->pdev, 195 "netmap kernel ring %d is NULL\n", qid); 196 return; 197 } 198 199 lim = kring->nkr_num_slots - 1; 200 nm_i = nm_prev(kring->nr_hwcur, lim); 201 202 if (kring->nr_mode != NKR_NETMAP_ON) 203 return; 204 205 bus_dmamap_sync(adapter->rx_buf_tag, rx_info->map, 206 BUS_DMASYNC_POSTREAD); 207 netmap_unload_map(na, adapter->rx_buf_tag, rx_info->map); 208 209 KASSERT(kring->ring == NULL, ("Netmap Rx ring is NULL\n")); 210 211 slot = &kring->ring->slot[nm_i]; 212 213 ENA_ASSERT(slot->buf_idx == 0, "Overwrite slot buf\n"); 214 slot->buf_idx = rx_info->netmap_buf_idx; 215 slot->flags = NS_BUF_CHANGED; 216 217 rx_info->netmap_buf_idx = 0; 218 kring->nr_hwcur = nm_i; 219 } 220 221 static bool 222 ena_ring_in_netmap(struct ena_adapter *adapter, int qid, enum txrx x) 223 { 224 struct netmap_adapter *na; 225 struct netmap_kring *kring; 226 227 if (adapter->ifp->if_capenable & IFCAP_NETMAP) { 228 na = NA(adapter->ifp); 229 kring = (x == NR_RX) ? na->rx_rings[qid] : na->tx_rings[qid]; 230 if (kring->nr_mode == NKR_NETMAP_ON) 231 return true; 232 } 233 return false; 234 } 235 236 bool 237 ena_tx_ring_in_netmap(struct ena_adapter *adapter, int qid) 238 { 239 return ena_ring_in_netmap(adapter, qid, NR_TX); 240 } 241 242 bool 243 ena_rx_ring_in_netmap(struct ena_adapter *adapter, int qid) 244 { 245 return ena_ring_in_netmap(adapter, qid, NR_RX); 246 } 247 248 static void 249 ena_netmap_reset_ring(struct ena_adapter *adapter, int qid, enum txrx x) 250 { 251 if (!ena_ring_in_netmap(adapter, qid, x)) 252 return; 253 254 netmap_reset(NA(adapter->ifp), x, qid, 0); 255 ena_trace(ENA_NETMAP, "%s ring %d is in netmap mode\n", 256 (x == NR_TX) ? "Tx" : "Rx", qid); 257 } 258 259 void 260 ena_netmap_reset_rx_ring(struct ena_adapter *adapter, int qid) 261 { 262 ena_netmap_reset_ring(adapter, qid, NR_RX); 263 } 264 265 void 266 ena_netmap_reset_tx_ring(struct ena_adapter *adapter, int qid) 267 { 268 ena_netmap_reset_ring(adapter, qid, NR_TX); 269 } 270 271 static int 272 ena_netmap_reg(struct netmap_adapter *na, int onoff) 273 { 274 struct ifnet *ifp = na->ifp; 275 struct ena_adapter* adapter = ifp->if_softc; 276 struct netmap_kring *kring; 277 enum txrx t; 278 int rc, i; 279 280 ENA_LOCK_LOCK(adapter); 281 ENA_FLAG_CLEAR_ATOMIC(ENA_FLAG_TRIGGER_RESET, adapter); 282 ena_down(adapter); 283 284 if (onoff) { 285 ena_trace(ENA_NETMAP, "netmap on\n"); 286 for_rx_tx(t) { 287 for (i = 0; i <= nma_get_nrings(na, t); i++) { 288 kring = NMR(na, t)[i]; 289 if (nm_kring_pending_on(kring)) { 290 kring->nr_mode = NKR_NETMAP_ON; 291 } 292 } 293 } 294 nm_set_native_flags(na); 295 } else { 296 ena_trace(ENA_NETMAP, "netmap off\n"); 297 nm_clear_native_flags(na); 298 for_rx_tx(t) { 299 for (i = 0; i <= nma_get_nrings(na, t); i++) { 300 kring = NMR(na, t)[i]; 301 if (nm_kring_pending_off(kring)) { 302 kring->nr_mode = NKR_NETMAP_OFF; 303 } 304 } 305 } 306 } 307 308 rc = ena_up(adapter); 309 if (rc != 0) { 310 ena_trace(ENA_WARNING, "ena_up failed with rc=%d\n", rc); 311 adapter->reset_reason = ENA_REGS_RESET_DRIVER_INVALID_STATE; 312 nm_clear_native_flags(na); 313 ena_destroy_device(adapter, false); 314 ENA_FLAG_SET_ATOMIC(ENA_FLAG_DEV_UP_BEFORE_RESET, adapter); 315 rc = ena_restore_device(adapter); 316 } 317 ENA_LOCK_UNLOCK(adapter); 318 319 return (rc); 320 } 321 322 static int 323 ena_netmap_txsync(struct netmap_kring *kring, int flags) 324 { 325 struct ena_netmap_ctx ctx; 326 int rc = 0; 327 328 ena_netmap_fill_ctx(kring, &ctx, ENA_IO_TXQ_IDX(kring->ring_id)); 329 ctx.ring = &ctx.adapter->tx_ring[kring->ring_id]; 330 331 ENA_RING_MTX_LOCK(ctx.ring); 332 if (unlikely(!ENA_FLAG_ISSET(ENA_FLAG_DEV_UP, ctx.adapter))) 333 goto txsync_end; 334 335 if (unlikely(!ENA_FLAG_ISSET(ENA_FLAG_LINK_UP, ctx.adapter))) 336 goto txsync_end; 337 338 rc = ena_netmap_tx_frames(&ctx); 339 ena_netmap_tx_cleanup(&ctx); 340 341 txsync_end: 342 ENA_RING_MTX_UNLOCK(ctx.ring); 343 return (rc); 344 } 345 346 static int 347 ena_netmap_tx_frames(struct ena_netmap_ctx *ctx) 348 { 349 struct ena_ring *tx_ring = ctx->ring; 350 int rc = 0; 351 352 ctx->nm_i = ctx->kring->nr_hwcur; 353 ctx->nt = ctx->ring->next_to_use; 354 355 __builtin_prefetch(&ctx->slots[ctx->nm_i]); 356 357 while (ctx->nm_i != ctx->kring->rhead) { 358 if ((rc = ena_netmap_tx_frame(ctx)) != 0) { 359 /* 360 * When there is no empty space in Tx ring, error is 361 * still being returned. It should not be passed to the 362 * netmap, as application knows current ring state from 363 * netmap ring pointers. Returning error there could 364 * cause application to exit, but the Tx ring is commonly 365 * being full. 366 */ 367 if (rc == ENA_COM_NO_MEM) 368 rc = 0; 369 break; 370 } 371 tx_ring->acum_pkts++; 372 } 373 374 /* If any packet was sent... */ 375 if (likely(ctx->nm_i != ctx->kring->nr_hwcur)) { 376 /* ...send the doorbell to the device. */ 377 ena_com_write_sq_doorbell(ctx->io_sq); 378 counter_u64_add(ctx->ring->tx_stats.doorbells, 1); 379 tx_ring->acum_pkts = 0; 380 381 ctx->ring->next_to_use = ctx->nt; 382 ctx->kring->nr_hwcur = ctx->nm_i; 383 } 384 385 return (rc); 386 } 387 388 static int 389 ena_netmap_tx_frame(struct ena_netmap_ctx *ctx) 390 { 391 struct ena_com_tx_ctx ena_tx_ctx; 392 struct ena_adapter *adapter; 393 struct ena_ring *tx_ring; 394 struct ena_tx_buffer *tx_info; 395 uint16_t req_id; 396 uint16_t header_len; 397 uint16_t packet_len; 398 int nb_hw_desc; 399 int rc; 400 void *push_hdr; 401 402 adapter = ctx->adapter; 403 if (ena_netmap_count_slots(ctx) > adapter->max_tx_sgl_size) { 404 ena_trace(ENA_WARNING, "Too many slots per packet\n"); 405 return (EINVAL); 406 } 407 408 tx_ring = ctx->ring; 409 410 req_id = tx_ring->free_tx_ids[ctx->nt]; 411 tx_info = &tx_ring->tx_buffer_info[req_id]; 412 tx_info->num_of_bufs = 0; 413 tx_info->nm_info.sockets_used = 0; 414 415 rc = ena_netmap_tx_map_slots(ctx, tx_info, &push_hdr, &header_len, 416 &packet_len); 417 if (unlikely(rc != 0)) { 418 device_printf(adapter->pdev, "Failed to map Tx slot\n"); 419 return (rc); 420 } 421 422 bzero(&ena_tx_ctx, sizeof(struct ena_com_tx_ctx)); 423 ena_tx_ctx.ena_bufs = tx_info->bufs; 424 ena_tx_ctx.push_header = push_hdr; 425 ena_tx_ctx.num_bufs = tx_info->num_of_bufs; 426 ena_tx_ctx.req_id = req_id; 427 ena_tx_ctx.header_len = header_len; 428 429 /* There are no any offloads, as the netmap doesn't support them */ 430 431 if (tx_ring->acum_pkts == DB_THRESHOLD || 432 ena_com_is_doorbell_needed(ctx->io_sq, &ena_tx_ctx)) { 433 ena_com_write_sq_doorbell(ctx->io_sq); 434 counter_u64_add(tx_ring->tx_stats.doorbells, 1); 435 tx_ring->acum_pkts = 0; 436 } 437 438 rc = ena_com_prepare_tx(ctx->io_sq, &ena_tx_ctx, &nb_hw_desc); 439 if (unlikely(rc != 0)) { 440 if (likely(rc == ENA_COM_NO_MEM)) { 441 ena_trace(ENA_NETMAP | ENA_DBG | ENA_TXPTH, 442 "Tx ring[%d] is out of space\n", tx_ring->que->id); 443 } else { 444 device_printf(adapter->pdev, 445 "Failed to prepare Tx bufs\n"); 446 } 447 counter_u64_add(tx_ring->tx_stats.prepare_ctx_err, 1); 448 449 ena_netmap_unmap_last_socket_chain(ctx, tx_info); 450 return (rc); 451 } 452 453 counter_enter(); 454 counter_u64_add_protected(tx_ring->tx_stats.cnt, 1); 455 counter_u64_add_protected(tx_ring->tx_stats.bytes, packet_len); 456 counter_u64_add_protected(adapter->hw_stats.tx_packets, 1); 457 counter_u64_add_protected(adapter->hw_stats.tx_bytes, packet_len); 458 counter_exit(); 459 460 tx_info->tx_descs = nb_hw_desc; 461 462 ctx->nt = ENA_TX_RING_IDX_NEXT(ctx->nt, ctx->ring->ring_size); 463 464 for (unsigned int i = 0; i < tx_info->num_of_bufs; i++) 465 bus_dmamap_sync(adapter->tx_buf_tag, 466 tx_info->nm_info.map_seg[i], BUS_DMASYNC_PREWRITE); 467 468 return (0); 469 } 470 471 static inline uint16_t 472 ena_netmap_count_slots(struct ena_netmap_ctx *ctx) 473 { 474 uint16_t slots = 1; 475 uint16_t nm = ctx->nm_i; 476 477 while ((ctx->slots[nm].flags & NS_MOREFRAG) != 0) { 478 slots++; 479 nm = nm_next(nm, ctx->lim); 480 } 481 482 return slots; 483 } 484 485 static inline uint16_t 486 ena_netmap_packet_len(struct netmap_slot *slots, u_int slot_index, 487 uint16_t limit) 488 { 489 struct netmap_slot *nm_slot; 490 uint16_t packet_size = 0; 491 492 do { 493 nm_slot = &slots[slot_index]; 494 packet_size += nm_slot->len; 495 slot_index = nm_next(slot_index, limit); 496 } while ((nm_slot->flags & NS_MOREFRAG) != 0); 497 498 return packet_size; 499 } 500 501 static int 502 ena_netmap_copy_data(struct netmap_adapter *na, struct netmap_slot *slots, 503 u_int slot_index, uint16_t limit, uint16_t bytes_to_copy, void *destination) 504 { 505 struct netmap_slot *nm_slot; 506 void *slot_vaddr; 507 uint16_t packet_size; 508 uint16_t data_amount; 509 510 packet_size = 0; 511 do { 512 nm_slot = &slots[slot_index]; 513 slot_vaddr = NMB(na, nm_slot); 514 if (unlikely(slot_vaddr == NULL)) 515 return (EINVAL); 516 517 data_amount = min_t(uint16_t, bytes_to_copy, nm_slot->len); 518 memcpy(destination, slot_vaddr, data_amount); 519 bytes_to_copy -= data_amount; 520 521 slot_index = nm_next(slot_index, limit); 522 } while ((nm_slot->flags & NS_MOREFRAG) != 0 && bytes_to_copy > 0); 523 524 return (0); 525 } 526 527 static int 528 ena_netmap_map_single_slot(struct netmap_adapter *na, struct netmap_slot *slot, 529 bus_dma_tag_t dmatag, bus_dmamap_t dmamap, void **vaddr, uint64_t *paddr) 530 { 531 int rc; 532 533 *vaddr = PNMB(na, slot, paddr); 534 if (unlikely(vaddr == NULL)) { 535 ena_trace(ENA_ALERT, "Slot address is NULL\n"); 536 return (EINVAL); 537 } 538 539 rc = netmap_load_map(na, dmatag, dmamap, *vaddr); 540 if (unlikely(rc != 0)) { 541 ena_trace(ENA_ALERT, "Failed to map slot %d for DMA\n", 542 slot->buf_idx); 543 return (EINVAL); 544 } 545 546 return (0); 547 } 548 549 static int 550 ena_netmap_tx_map_slots(struct ena_netmap_ctx *ctx, 551 struct ena_tx_buffer *tx_info, void **push_hdr, uint16_t *header_len, 552 uint16_t *packet_len) 553 { 554 struct netmap_slot *slot; 555 struct ena_com_buf *ena_buf; 556 struct ena_adapter *adapter; 557 struct ena_ring *tx_ring; 558 struct ena_netmap_tx_info *nm_info; 559 bus_dmamap_t *nm_maps; 560 void *vaddr; 561 uint64_t paddr; 562 uint32_t *nm_buf_idx; 563 uint32_t slot_head_len; 564 uint32_t frag_len; 565 uint32_t remaining_len; 566 uint16_t push_len; 567 uint16_t delta; 568 int rc; 569 570 adapter = ctx->adapter; 571 tx_ring = ctx->ring; 572 ena_buf = tx_info->bufs; 573 nm_info = &tx_info->nm_info; 574 nm_maps = nm_info->map_seg; 575 nm_buf_idx = nm_info->socket_buf_idx; 576 slot = &ctx->slots[ctx->nm_i]; 577 578 slot_head_len = slot->len; 579 *packet_len = ena_netmap_packet_len(ctx->slots, ctx->nm_i, ctx->lim); 580 remaining_len = *packet_len; 581 delta = 0; 582 583 __builtin_prefetch(&ctx->slots[ctx->nm_i + 1]); 584 if (tx_ring->tx_mem_queue_type == ENA_ADMIN_PLACEMENT_POLICY_DEV) { 585 /* 586 * When the device is in LLQ mode, the driver will copy 587 * the header into the device memory space. 588 * The ena_com layer assumes that the header is in a linear 589 * memory space. 590 * This assumption might be wrong since part of the header 591 * can be in the fragmented buffers. 592 * First, check if header fits in the first slot. If not, copy 593 * it to separate buffer that will be holding linearized data. 594 */ 595 push_len = min_t(uint32_t, *packet_len, 596 tx_ring->tx_max_header_size); 597 *header_len = push_len; 598 /* If header is in linear space, just point to socket's data. */ 599 if (likely(push_len <= slot_head_len)) { 600 *push_hdr = NMB(ctx->na, slot); 601 if (unlikely(push_hdr == NULL)) { 602 device_printf(adapter->pdev, 603 "Slot vaddress is NULL\n"); 604 return (EINVAL); 605 } 606 /* 607 * Otherwise, copy whole portion of header from multiple slots 608 * to intermediate buffer. 609 */ 610 } else { 611 rc = ena_netmap_copy_data(ctx->na, 612 ctx->slots, 613 ctx->nm_i, 614 ctx->lim, 615 push_len, 616 tx_ring->push_buf_intermediate_buf); 617 if (unlikely(rc)) { 618 device_printf(adapter->pdev, 619 "Failed to copy data from slots to push_buf\n"); 620 return (EINVAL); 621 } 622 623 *push_hdr = tx_ring->push_buf_intermediate_buf; 624 counter_u64_add(tx_ring->tx_stats.llq_buffer_copy, 1); 625 626 delta = push_len - slot_head_len; 627 } 628 629 ena_trace(ENA_NETMAP | ENA_DBG | ENA_TXPTH, 630 "slot: %d header_buf->vaddr: %p push_len: %d\n", 631 slot->buf_idx, *push_hdr, push_len); 632 633 /* 634 * If header was in linear memory space, map for the dma rest of the data 635 * in the first mbuf of the mbuf chain. 636 */ 637 if (slot_head_len > push_len) { 638 rc = ena_netmap_map_single_slot(ctx->na, 639 slot, 640 adapter->tx_buf_tag, 641 *nm_maps, 642 &vaddr, 643 &paddr); 644 if (unlikely(rc != 0)) { 645 device_printf(adapter->pdev, 646 "DMA mapping error\n"); 647 return (rc); 648 } 649 nm_maps++; 650 651 ena_buf->paddr = paddr + push_len; 652 ena_buf->len = slot->len - push_len; 653 ena_buf++; 654 655 tx_info->num_of_bufs++; 656 } 657 658 remaining_len -= slot->len; 659 660 /* Save buf idx before advancing */ 661 *nm_buf_idx = slot->buf_idx; 662 nm_buf_idx++; 663 slot->buf_idx = 0; 664 665 /* Advance to the next socket */ 666 ctx->nm_i = nm_next(ctx->nm_i, ctx->lim); 667 slot = &ctx->slots[ctx->nm_i]; 668 nm_info->sockets_used++; 669 670 /* 671 * If header is in non linear space (delta > 0), then skip mbufs 672 * containing header and map the last one containing both header 673 * and the packet data. 674 * The first segment is already counted in. 675 */ 676 while (delta > 0) { 677 __builtin_prefetch(&ctx->slots[ctx->nm_i + 1]); 678 frag_len = slot->len; 679 680 /* 681 * If whole segment contains header just move to the 682 * next one and reduce delta. 683 */ 684 if (unlikely(delta >= frag_len)) { 685 delta -= frag_len; 686 } else { 687 /* 688 * Map the data and then assign it with the 689 * offsets 690 */ 691 rc = ena_netmap_map_single_slot(ctx->na, 692 slot, 693 adapter->tx_buf_tag, 694 *nm_maps, 695 &vaddr, 696 &paddr); 697 if (unlikely(rc != 0)) { 698 device_printf(adapter->pdev, 699 "DMA mapping error\n"); 700 goto error_map; 701 } 702 nm_maps++; 703 704 ena_buf->paddr = paddr + delta; 705 ena_buf->len = slot->len - delta; 706 ena_buf++; 707 708 tx_info->num_of_bufs++; 709 delta = 0; 710 } 711 712 remaining_len -= slot->len; 713 714 /* Save buf idx before advancing */ 715 *nm_buf_idx = slot->buf_idx; 716 nm_buf_idx++; 717 slot->buf_idx = 0; 718 719 /* Advance to the next socket */ 720 ctx->nm_i = nm_next(ctx->nm_i, ctx->lim); 721 slot = &ctx->slots[ctx->nm_i]; 722 nm_info->sockets_used++; 723 } 724 } else { 725 *push_hdr = NULL; 726 /* 727 * header_len is just a hint for the device. Because netmap is 728 * not giving us any information about packet header length and 729 * it is not guaranteed that all packet headers will be in the 730 * 1st slot, setting header_len to 0 is making the device ignore 731 * this value and resolve header on it's own. 732 */ 733 *header_len = 0; 734 } 735 736 /* Map all remaining data (regular routine for non-LLQ mode) */ 737 while (remaining_len > 0) { 738 __builtin_prefetch(&ctx->slots[ctx->nm_i + 1]); 739 740 rc = ena_netmap_map_single_slot(ctx->na, 741 slot, 742 adapter->tx_buf_tag, 743 *nm_maps, 744 &vaddr, 745 &paddr); 746 if (unlikely(rc != 0)) { 747 device_printf(adapter->pdev, 748 "DMA mapping error\n"); 749 goto error_map; 750 } 751 nm_maps++; 752 753 ena_buf->paddr = paddr; 754 ena_buf->len = slot->len; 755 ena_buf++; 756 757 tx_info->num_of_bufs++; 758 759 remaining_len -= slot->len; 760 761 /* Save buf idx before advancing */ 762 *nm_buf_idx = slot->buf_idx; 763 nm_buf_idx++; 764 slot->buf_idx = 0; 765 766 /* Advance to the next socket */ 767 ctx->nm_i = nm_next(ctx->nm_i, ctx->lim); 768 slot = &ctx->slots[ctx->nm_i]; 769 nm_info->sockets_used++; 770 } 771 772 return (0); 773 774 error_map: 775 ena_netmap_unmap_last_socket_chain(ctx, tx_info); 776 777 return (rc); 778 } 779 780 static void 781 ena_netmap_unmap_last_socket_chain(struct ena_netmap_ctx *ctx, 782 struct ena_tx_buffer *tx_info) 783 { 784 struct ena_netmap_tx_info *nm_info; 785 int n; 786 787 nm_info = &tx_info->nm_info; 788 789 /** 790 * As the used sockets must not be equal to the buffers used in the LLQ 791 * mode, they must be treated separately. 792 * First, unmap the DMA maps. 793 */ 794 n = tx_info->num_of_bufs; 795 while (n--) { 796 netmap_unload_map(ctx->na, ctx->adapter->tx_buf_tag, 797 nm_info->map_seg[n]); 798 } 799 tx_info->num_of_bufs = 0; 800 801 /* Next, retain the sockets back to the userspace */ 802 n = nm_info->sockets_used; 803 while (n--) { 804 ctx->slots[ctx->nm_i].buf_idx = nm_info->socket_buf_idx[n]; 805 ctx->slots[ctx->nm_i].flags = NS_BUF_CHANGED; 806 nm_info->socket_buf_idx[n] = 0; 807 ctx->nm_i = nm_prev(ctx->nm_i, ctx->lim); 808 } 809 nm_info->sockets_used = 0; 810 } 811 812 static void 813 ena_netmap_tx_cleanup(struct ena_netmap_ctx *ctx) 814 { 815 uint16_t req_id; 816 uint16_t total_tx_descs = 0; 817 818 ctx->nm_i = ctx->kring->nr_hwtail; 819 ctx->nt = ctx->ring->next_to_clean; 820 821 /* Reclaim buffers for completed transmissions */ 822 while (ena_com_tx_comp_req_id_get(ctx->io_cq, &req_id) >= 0) { 823 if (validate_tx_req_id(ctx->ring, req_id) != 0) 824 break; 825 total_tx_descs += ena_netmap_tx_clean_one(ctx, req_id); 826 } 827 828 ctx->kring->nr_hwtail = ctx->nm_i; 829 830 if (total_tx_descs > 0) { 831 /* acknowledge completion of sent packets */ 832 ctx->ring->next_to_clean = ctx->nt; 833 ena_com_comp_ack(ctx->ring->ena_com_io_sq, total_tx_descs); 834 ena_com_update_dev_comp_head(ctx->ring->ena_com_io_cq); 835 } 836 } 837 838 static uint16_t 839 ena_netmap_tx_clean_one(struct ena_netmap_ctx *ctx, uint16_t req_id) 840 { 841 struct ena_tx_buffer *tx_info; 842 struct ena_netmap_tx_info *nm_info; 843 int n; 844 845 tx_info = &ctx->ring->tx_buffer_info[req_id]; 846 nm_info = &tx_info->nm_info; 847 848 /** 849 * As the used sockets must not be equal to the buffers used in the LLQ 850 * mode, they must be treated separately. 851 * First, unmap the DMA maps. 852 */ 853 n = tx_info->num_of_bufs; 854 for (n = 0; n < tx_info->num_of_bufs; n++) { 855 netmap_unload_map(ctx->na, ctx->adapter->tx_buf_tag, 856 nm_info->map_seg[n]); 857 } 858 tx_info->num_of_bufs = 0; 859 860 /* Next, retain the sockets back to the userspace */ 861 for (n = 0; n < nm_info->sockets_used; n++) { 862 ctx->nm_i = nm_next(ctx->nm_i, ctx->lim); 863 ENA_ASSERT(ctx->slots[ctx->nm_i].buf_idx == 0, 864 "Tx idx is not 0.\n"); 865 ctx->slots[ctx->nm_i].buf_idx = nm_info->socket_buf_idx[n]; 866 ctx->slots[ctx->nm_i].flags = NS_BUF_CHANGED; 867 nm_info->socket_buf_idx[n] = 0; 868 } 869 nm_info->sockets_used = 0; 870 871 ctx->ring->free_tx_ids[ctx->nt] = req_id; 872 ctx->nt = ENA_TX_RING_IDX_NEXT(ctx->nt, ctx->lim); 873 874 return tx_info->tx_descs; 875 } 876 877 static inline int 878 validate_tx_req_id(struct ena_ring *tx_ring, uint16_t req_id) 879 { 880 struct ena_adapter *adapter = tx_ring->adapter; 881 882 if (likely(req_id < tx_ring->ring_size)) 883 return (0); 884 885 ena_trace(ENA_WARNING, "Invalid req_id: %hu\n", req_id); 886 counter_u64_add(tx_ring->tx_stats.bad_req_id, 1); 887 888 ena_trigger_reset(adapter, ENA_REGS_RESET_INV_TX_REQ_ID); 889 890 return (EFAULT); 891 } 892 893 static int 894 ena_netmap_rxsync(struct netmap_kring *kring, int flags) 895 { 896 struct ena_netmap_ctx ctx; 897 int rc; 898 899 ena_netmap_fill_ctx(kring, &ctx, ENA_IO_RXQ_IDX(kring->ring_id)); 900 ctx.ring = &ctx.adapter->rx_ring[kring->ring_id]; 901 902 if (ctx.kring->rhead > ctx.lim) { 903 /* Probably not needed to release slots from RX ring. */ 904 return (netmap_ring_reinit(ctx.kring)); 905 } 906 907 if (unlikely((if_getdrvflags(ctx.na->ifp) & IFF_DRV_RUNNING) == 0)) 908 return (0); 909 910 if (unlikely(!ENA_FLAG_ISSET(ENA_FLAG_LINK_UP, ctx.adapter))) 911 return (0); 912 913 if ((rc = ena_netmap_rx_frames(&ctx)) != 0) 914 return (rc); 915 916 ena_netmap_rx_cleanup(&ctx); 917 918 return (0); 919 } 920 921 static inline int 922 ena_netmap_rx_frames(struct ena_netmap_ctx *ctx) 923 { 924 int rc = 0; 925 int frames_counter = 0; 926 927 ctx->nt = ctx->ring->next_to_clean; 928 ctx->nm_i = ctx->kring->nr_hwtail; 929 930 while((rc = ena_netmap_rx_frame(ctx)) == ENA_NETMAP_MORE_FRAMES) { 931 frames_counter++; 932 /* In case of multiple frames, it is not an error. */ 933 rc = 0; 934 if (frames_counter > ENA_MAX_FRAMES) { 935 device_printf(ctx->adapter->pdev, 936 "Driver is stuck in the Rx loop\n"); 937 break; 938 } 939 }; 940 941 ctx->kring->nr_hwtail = ctx->nm_i; 942 ctx->kring->nr_kflags &= ~NKR_PENDINTR; 943 ctx->ring->next_to_clean = ctx->nt; 944 945 return (rc); 946 } 947 948 static inline int 949 ena_netmap_rx_frame(struct ena_netmap_ctx *ctx) 950 { 951 struct ena_com_rx_ctx ena_rx_ctx; 952 int rc, len = 0; 953 uint16_t buf, nm; 954 955 ena_rx_ctx.ena_bufs = ctx->ring->ena_bufs; 956 ena_rx_ctx.max_bufs = ctx->adapter->max_rx_sgl_size; 957 bus_dmamap_sync(ctx->io_cq->cdesc_addr.mem_handle.tag, 958 ctx->io_cq->cdesc_addr.mem_handle.map, BUS_DMASYNC_POSTREAD); 959 960 rc = ena_com_rx_pkt(ctx->io_cq, ctx->io_sq, &ena_rx_ctx); 961 if (unlikely(rc != 0)) { 962 ena_trace(ENA_ALERT, "Too many desc from the device.\n"); 963 counter_u64_add(ctx->ring->rx_stats.bad_desc_num, 1); 964 ena_trigger_reset(ctx->adapter, 965 ENA_REGS_RESET_TOO_MANY_RX_DESCS); 966 return (rc); 967 } 968 if (unlikely(ena_rx_ctx.descs == 0)) 969 return (ENA_NETMAP_NO_MORE_FRAMES); 970 971 ena_trace(ENA_NETMAP | ENA_DBG, "Rx: q %d got packet from ena. descs #:" 972 " %d l3 proto %d l4 proto %d hash: %x\n", ctx->ring->qid, 973 ena_rx_ctx.descs, ena_rx_ctx.l3_proto, ena_rx_ctx.l4_proto, 974 ena_rx_ctx.hash); 975 976 for (buf = 0; buf < ena_rx_ctx.descs; buf++) 977 if ((rc = ena_netmap_rx_load_desc(ctx, buf, &len)) != 0) 978 break; 979 /* 980 * ena_netmap_rx_load_desc doesn't know the number of descriptors. 981 * It just set flag NS_MOREFRAG to all slots, then here flag of 982 * last slot is cleared. 983 */ 984 ctx->slots[nm_prev(ctx->nm_i, ctx->lim)].flags = NS_BUF_CHANGED; 985 986 if (rc != 0) { 987 goto rx_clear_desc; 988 } 989 990 bus_dmamap_sync(ctx->io_cq->cdesc_addr.mem_handle.tag, 991 ctx->io_cq->cdesc_addr.mem_handle.map, BUS_DMASYNC_PREREAD); 992 993 counter_enter(); 994 counter_u64_add_protected(ctx->ring->rx_stats.bytes, len); 995 counter_u64_add_protected(ctx->adapter->hw_stats.rx_bytes, len); 996 counter_u64_add_protected(ctx->ring->rx_stats.cnt, 1); 997 counter_u64_add_protected(ctx->adapter->hw_stats.rx_packets, 1); 998 counter_exit(); 999 1000 return (ENA_NETMAP_MORE_FRAMES); 1001 1002 rx_clear_desc: 1003 nm = ctx->nm_i; 1004 1005 /* Remove failed packet from ring */ 1006 while(buf--) { 1007 ctx->slots[nm].flags = 0; 1008 ctx->slots[nm].len = 0; 1009 nm = nm_prev(nm, ctx->lim); 1010 } 1011 1012 return (rc); 1013 } 1014 1015 static inline int 1016 ena_netmap_rx_load_desc(struct ena_netmap_ctx *ctx, uint16_t buf, int *len) 1017 { 1018 struct ena_rx_buffer *rx_info; 1019 uint16_t req_id; 1020 int rc; 1021 1022 req_id = ctx->ring->ena_bufs[buf].req_id; 1023 rc = validate_rx_req_id(ctx->ring, req_id); 1024 if (unlikely(rc != 0)) 1025 return (rc); 1026 1027 rx_info = &ctx->ring->rx_buffer_info[req_id]; 1028 bus_dmamap_sync(ctx->adapter->rx_buf_tag, rx_info->map, 1029 BUS_DMASYNC_POSTREAD); 1030 netmap_unload_map(ctx->na, ctx->adapter->rx_buf_tag, rx_info->map); 1031 1032 ENA_ASSERT(ctx->slots[ctx->nm_i].buf_idx == 0, "Rx idx is not 0.\n"); 1033 1034 ctx->slots[ctx->nm_i].buf_idx = rx_info->netmap_buf_idx; 1035 rx_info->netmap_buf_idx = 0; 1036 /* 1037 * Set NS_MOREFRAG to all slots. 1038 * Then ena_netmap_rx_frame clears it from last one. 1039 */ 1040 ctx->slots[ctx->nm_i].flags |= NS_MOREFRAG | NS_BUF_CHANGED; 1041 ctx->slots[ctx->nm_i].len = ctx->ring->ena_bufs[buf].len; 1042 *len += ctx->slots[ctx->nm_i].len; 1043 ctx->ring->free_rx_ids[ctx->nt] = req_id; 1044 ena_trace(ENA_DBG, "rx_info %p, buf_idx %d, paddr %jx, nm: %d\n", 1045 rx_info, ctx->slots[ctx->nm_i].buf_idx, 1046 (uintmax_t)rx_info->ena_buf.paddr, ctx->nm_i); 1047 1048 ctx->nm_i = nm_next(ctx->nm_i, ctx->lim); 1049 ctx->nt = ENA_RX_RING_IDX_NEXT(ctx->nt, ctx->ring->ring_size); 1050 1051 return (0); 1052 } 1053 1054 static inline void 1055 ena_netmap_rx_cleanup(struct ena_netmap_ctx *ctx) 1056 { 1057 int refill_required; 1058 1059 refill_required = ctx->kring->rhead - ctx->kring->nr_hwcur; 1060 if (ctx->kring->nr_hwcur != ctx->kring->nr_hwtail) 1061 refill_required -= 1; 1062 1063 if (refill_required == 0) 1064 return; 1065 else if (refill_required < 0) 1066 refill_required += ctx->kring->nkr_num_slots; 1067 1068 ena_refill_rx_bufs(ctx->ring, refill_required); 1069 } 1070 1071 static inline void 1072 ena_netmap_fill_ctx(struct netmap_kring *kring, struct ena_netmap_ctx *ctx, 1073 uint16_t ena_qid) 1074 { 1075 ctx->kring = kring; 1076 ctx->na = kring->na; 1077 ctx->adapter = ctx->na->ifp->if_softc; 1078 ctx->lim = kring->nkr_num_slots - 1; 1079 ctx->io_cq = &ctx->adapter->ena_dev->io_cq_queues[ena_qid]; 1080 ctx->io_sq = &ctx->adapter->ena_dev->io_sq_queues[ena_qid]; 1081 ctx->slots = kring->ring->slot; 1082 } 1083 1084 void 1085 ena_netmap_unload(struct ena_adapter *adapter, bus_dmamap_t map) 1086 { 1087 struct netmap_adapter *na = NA(adapter->ifp); 1088 1089 netmap_unload_map(na, adapter->tx_buf_tag, map); 1090 } 1091 1092 #endif /* DEV_NETMAP */ 1093