1 // SPDX-License-Identifier: GPL-2.0+ 2 3 #include "lan966x_main.h" 4 5 static int lan966x_fdma_channel_active(struct lan966x *lan966x) 6 { 7 return lan_rd(lan966x, FDMA_CH_ACTIVE); 8 } 9 10 static struct page *lan966x_fdma_rx_alloc_page(struct lan966x_rx *rx, 11 struct lan966x_db *db) 12 { 13 struct lan966x *lan966x = rx->lan966x; 14 dma_addr_t dma_addr; 15 struct page *page; 16 17 page = dev_alloc_pages(rx->page_order); 18 if (unlikely(!page)) 19 return NULL; 20 21 dma_addr = dma_map_page(lan966x->dev, page, 0, 22 PAGE_SIZE << rx->page_order, 23 DMA_FROM_DEVICE); 24 if (unlikely(dma_mapping_error(lan966x->dev, dma_addr))) 25 goto free_page; 26 27 db->dataptr = dma_addr; 28 29 return page; 30 31 free_page: 32 __free_pages(page, rx->page_order); 33 return NULL; 34 } 35 36 static void lan966x_fdma_rx_free_pages(struct lan966x_rx *rx) 37 { 38 struct lan966x *lan966x = rx->lan966x; 39 struct lan966x_rx_dcb *dcb; 40 struct lan966x_db *db; 41 int i, j; 42 43 for (i = 0; i < FDMA_DCB_MAX; ++i) { 44 dcb = &rx->dcbs[i]; 45 46 for (j = 0; j < FDMA_RX_DCB_MAX_DBS; ++j) { 47 db = &dcb->db[j]; 48 dma_unmap_single(lan966x->dev, 49 (dma_addr_t)db->dataptr, 50 PAGE_SIZE << rx->page_order, 51 DMA_FROM_DEVICE); 52 __free_pages(rx->page[i][j], rx->page_order); 53 } 54 } 55 } 56 57 static void lan966x_fdma_rx_add_dcb(struct lan966x_rx *rx, 58 struct lan966x_rx_dcb *dcb, 59 u64 nextptr) 60 { 61 struct lan966x_db *db; 62 int i; 63 64 for (i = 0; i < FDMA_RX_DCB_MAX_DBS; ++i) { 65 db = &dcb->db[i]; 66 db->status = FDMA_DCB_STATUS_INTR; 67 } 68 69 dcb->nextptr = FDMA_DCB_INVALID_DATA; 70 dcb->info = FDMA_DCB_INFO_DATAL(PAGE_SIZE << rx->page_order); 71 72 rx->last_entry->nextptr = nextptr; 73 rx->last_entry = dcb; 74 } 75 76 static int lan966x_fdma_rx_alloc(struct lan966x_rx *rx) 77 { 78 struct lan966x *lan966x = rx->lan966x; 79 struct lan966x_rx_dcb *dcb; 80 struct lan966x_db *db; 81 struct page *page; 82 int i, j; 83 int size; 84 85 /* calculate how many pages are needed to allocate the dcbs */ 86 size = sizeof(struct lan966x_rx_dcb) * FDMA_DCB_MAX; 87 size = ALIGN(size, PAGE_SIZE); 88 89 rx->dcbs = dma_alloc_coherent(lan966x->dev, size, &rx->dma, GFP_KERNEL); 90 if (!rx->dcbs) 91 return -ENOMEM; 92 93 rx->last_entry = rx->dcbs; 94 rx->db_index = 0; 95 rx->dcb_index = 0; 96 97 /* Now for each dcb allocate the dbs */ 98 for (i = 0; i < FDMA_DCB_MAX; ++i) { 99 dcb = &rx->dcbs[i]; 100 dcb->info = 0; 101 102 /* For each db allocate a page and map it to the DB dataptr. */ 103 for (j = 0; j < FDMA_RX_DCB_MAX_DBS; ++j) { 104 db = &dcb->db[j]; 105 page = lan966x_fdma_rx_alloc_page(rx, db); 106 if (!page) 107 return -ENOMEM; 108 109 db->status = 0; 110 rx->page[i][j] = page; 111 } 112 113 lan966x_fdma_rx_add_dcb(rx, dcb, rx->dma + sizeof(*dcb) * i); 114 } 115 116 return 0; 117 } 118 119 static void lan966x_fdma_rx_free(struct lan966x_rx *rx) 120 { 121 struct lan966x *lan966x = rx->lan966x; 122 u32 size; 123 124 /* Now it is possible to do the cleanup of dcb */ 125 size = sizeof(struct lan966x_tx_dcb) * FDMA_DCB_MAX; 126 size = ALIGN(size, PAGE_SIZE); 127 dma_free_coherent(lan966x->dev, size, rx->dcbs, rx->dma); 128 } 129 130 static void lan966x_fdma_rx_start(struct lan966x_rx *rx) 131 { 132 struct lan966x *lan966x = rx->lan966x; 133 u32 mask; 134 135 /* When activating a channel, first is required to write the first DCB 136 * address and then to activate it 137 */ 138 lan_wr(lower_32_bits((u64)rx->dma), lan966x, 139 FDMA_DCB_LLP(rx->channel_id)); 140 lan_wr(upper_32_bits((u64)rx->dma), lan966x, 141 FDMA_DCB_LLP1(rx->channel_id)); 142 143 lan_wr(FDMA_CH_CFG_CH_DCB_DB_CNT_SET(FDMA_RX_DCB_MAX_DBS) | 144 FDMA_CH_CFG_CH_INTR_DB_EOF_ONLY_SET(1) | 145 FDMA_CH_CFG_CH_INJ_PORT_SET(0) | 146 FDMA_CH_CFG_CH_MEM_SET(1), 147 lan966x, FDMA_CH_CFG(rx->channel_id)); 148 149 /* Start fdma */ 150 lan_rmw(FDMA_PORT_CTRL_XTR_STOP_SET(0), 151 FDMA_PORT_CTRL_XTR_STOP, 152 lan966x, FDMA_PORT_CTRL(0)); 153 154 /* Enable interrupts */ 155 mask = lan_rd(lan966x, FDMA_INTR_DB_ENA); 156 mask = FDMA_INTR_DB_ENA_INTR_DB_ENA_GET(mask); 157 mask |= BIT(rx->channel_id); 158 lan_rmw(FDMA_INTR_DB_ENA_INTR_DB_ENA_SET(mask), 159 FDMA_INTR_DB_ENA_INTR_DB_ENA, 160 lan966x, FDMA_INTR_DB_ENA); 161 162 /* Activate the channel */ 163 lan_rmw(FDMA_CH_ACTIVATE_CH_ACTIVATE_SET(BIT(rx->channel_id)), 164 FDMA_CH_ACTIVATE_CH_ACTIVATE, 165 lan966x, FDMA_CH_ACTIVATE); 166 } 167 168 static void lan966x_fdma_rx_disable(struct lan966x_rx *rx) 169 { 170 struct lan966x *lan966x = rx->lan966x; 171 u32 val; 172 173 /* Disable the channel */ 174 lan_rmw(FDMA_CH_DISABLE_CH_DISABLE_SET(BIT(rx->channel_id)), 175 FDMA_CH_DISABLE_CH_DISABLE, 176 lan966x, FDMA_CH_DISABLE); 177 178 readx_poll_timeout_atomic(lan966x_fdma_channel_active, lan966x, 179 val, !(val & BIT(rx->channel_id)), 180 READL_SLEEP_US, READL_TIMEOUT_US); 181 182 lan_rmw(FDMA_CH_DB_DISCARD_DB_DISCARD_SET(BIT(rx->channel_id)), 183 FDMA_CH_DB_DISCARD_DB_DISCARD, 184 lan966x, FDMA_CH_DB_DISCARD); 185 } 186 187 static void lan966x_fdma_rx_reload(struct lan966x_rx *rx) 188 { 189 struct lan966x *lan966x = rx->lan966x; 190 191 lan_rmw(FDMA_CH_RELOAD_CH_RELOAD_SET(BIT(rx->channel_id)), 192 FDMA_CH_RELOAD_CH_RELOAD, 193 lan966x, FDMA_CH_RELOAD); 194 } 195 196 static void lan966x_fdma_tx_add_dcb(struct lan966x_tx *tx, 197 struct lan966x_tx_dcb *dcb) 198 { 199 dcb->nextptr = FDMA_DCB_INVALID_DATA; 200 dcb->info = 0; 201 } 202 203 static int lan966x_fdma_tx_alloc(struct lan966x_tx *tx) 204 { 205 struct lan966x *lan966x = tx->lan966x; 206 struct lan966x_tx_dcb *dcb; 207 struct lan966x_db *db; 208 int size; 209 int i, j; 210 211 tx->dcbs_buf = kcalloc(FDMA_DCB_MAX, sizeof(struct lan966x_tx_dcb_buf), 212 GFP_KERNEL); 213 if (!tx->dcbs_buf) 214 return -ENOMEM; 215 216 /* calculate how many pages are needed to allocate the dcbs */ 217 size = sizeof(struct lan966x_tx_dcb) * FDMA_DCB_MAX; 218 size = ALIGN(size, PAGE_SIZE); 219 tx->dcbs = dma_alloc_coherent(lan966x->dev, size, &tx->dma, GFP_KERNEL); 220 if (!tx->dcbs) 221 goto out; 222 223 /* Now for each dcb allocate the db */ 224 for (i = 0; i < FDMA_DCB_MAX; ++i) { 225 dcb = &tx->dcbs[i]; 226 227 for (j = 0; j < FDMA_TX_DCB_MAX_DBS; ++j) { 228 db = &dcb->db[j]; 229 db->dataptr = 0; 230 db->status = 0; 231 } 232 233 lan966x_fdma_tx_add_dcb(tx, dcb); 234 } 235 236 return 0; 237 238 out: 239 kfree(tx->dcbs_buf); 240 return -ENOMEM; 241 } 242 243 static void lan966x_fdma_tx_free(struct lan966x_tx *tx) 244 { 245 struct lan966x *lan966x = tx->lan966x; 246 int size; 247 248 kfree(tx->dcbs_buf); 249 250 size = sizeof(struct lan966x_tx_dcb) * FDMA_DCB_MAX; 251 size = ALIGN(size, PAGE_SIZE); 252 dma_free_coherent(lan966x->dev, size, tx->dcbs, tx->dma); 253 } 254 255 static void lan966x_fdma_tx_activate(struct lan966x_tx *tx) 256 { 257 struct lan966x *lan966x = tx->lan966x; 258 u32 mask; 259 260 /* When activating a channel, first is required to write the first DCB 261 * address and then to activate it 262 */ 263 lan_wr(lower_32_bits((u64)tx->dma), lan966x, 264 FDMA_DCB_LLP(tx->channel_id)); 265 lan_wr(upper_32_bits((u64)tx->dma), lan966x, 266 FDMA_DCB_LLP1(tx->channel_id)); 267 268 lan_wr(FDMA_CH_CFG_CH_DCB_DB_CNT_SET(FDMA_TX_DCB_MAX_DBS) | 269 FDMA_CH_CFG_CH_INTR_DB_EOF_ONLY_SET(1) | 270 FDMA_CH_CFG_CH_INJ_PORT_SET(0) | 271 FDMA_CH_CFG_CH_MEM_SET(1), 272 lan966x, FDMA_CH_CFG(tx->channel_id)); 273 274 /* Start fdma */ 275 lan_rmw(FDMA_PORT_CTRL_INJ_STOP_SET(0), 276 FDMA_PORT_CTRL_INJ_STOP, 277 lan966x, FDMA_PORT_CTRL(0)); 278 279 /* Enable interrupts */ 280 mask = lan_rd(lan966x, FDMA_INTR_DB_ENA); 281 mask = FDMA_INTR_DB_ENA_INTR_DB_ENA_GET(mask); 282 mask |= BIT(tx->channel_id); 283 lan_rmw(FDMA_INTR_DB_ENA_INTR_DB_ENA_SET(mask), 284 FDMA_INTR_DB_ENA_INTR_DB_ENA, 285 lan966x, FDMA_INTR_DB_ENA); 286 287 /* Activate the channel */ 288 lan_rmw(FDMA_CH_ACTIVATE_CH_ACTIVATE_SET(BIT(tx->channel_id)), 289 FDMA_CH_ACTIVATE_CH_ACTIVATE, 290 lan966x, FDMA_CH_ACTIVATE); 291 } 292 293 static void lan966x_fdma_tx_disable(struct lan966x_tx *tx) 294 { 295 struct lan966x *lan966x = tx->lan966x; 296 u32 val; 297 298 /* Disable the channel */ 299 lan_rmw(FDMA_CH_DISABLE_CH_DISABLE_SET(BIT(tx->channel_id)), 300 FDMA_CH_DISABLE_CH_DISABLE, 301 lan966x, FDMA_CH_DISABLE); 302 303 readx_poll_timeout_atomic(lan966x_fdma_channel_active, lan966x, 304 val, !(val & BIT(tx->channel_id)), 305 READL_SLEEP_US, READL_TIMEOUT_US); 306 307 lan_rmw(FDMA_CH_DB_DISCARD_DB_DISCARD_SET(BIT(tx->channel_id)), 308 FDMA_CH_DB_DISCARD_DB_DISCARD, 309 lan966x, FDMA_CH_DB_DISCARD); 310 311 tx->activated = false; 312 } 313 314 static void lan966x_fdma_tx_reload(struct lan966x_tx *tx) 315 { 316 struct lan966x *lan966x = tx->lan966x; 317 318 /* Write the registers to reload the channel */ 319 lan_rmw(FDMA_CH_RELOAD_CH_RELOAD_SET(BIT(tx->channel_id)), 320 FDMA_CH_RELOAD_CH_RELOAD, 321 lan966x, FDMA_CH_RELOAD); 322 } 323 324 static void lan966x_fdma_wakeup_netdev(struct lan966x *lan966x) 325 { 326 struct lan966x_port *port; 327 int i; 328 329 for (i = 0; i < lan966x->num_phys_ports; ++i) { 330 port = lan966x->ports[i]; 331 if (!port) 332 continue; 333 334 if (netif_queue_stopped(port->dev)) 335 netif_wake_queue(port->dev); 336 } 337 } 338 339 static void lan966x_fdma_stop_netdev(struct lan966x *lan966x) 340 { 341 struct lan966x_port *port; 342 int i; 343 344 for (i = 0; i < lan966x->num_phys_ports; ++i) { 345 port = lan966x->ports[i]; 346 if (!port) 347 continue; 348 349 netif_stop_queue(port->dev); 350 } 351 } 352 353 static void lan966x_fdma_tx_clear_buf(struct lan966x *lan966x, int weight) 354 { 355 struct lan966x_tx *tx = &lan966x->tx; 356 struct lan966x_tx_dcb_buf *dcb_buf; 357 struct lan966x_db *db; 358 unsigned long flags; 359 bool clear = false; 360 int i; 361 362 spin_lock_irqsave(&lan966x->tx_lock, flags); 363 for (i = 0; i < FDMA_DCB_MAX; ++i) { 364 dcb_buf = &tx->dcbs_buf[i]; 365 366 if (!dcb_buf->used) 367 continue; 368 369 db = &tx->dcbs[i].db[0]; 370 if (!(db->status & FDMA_DCB_STATUS_DONE)) 371 continue; 372 373 dcb_buf->dev->stats.tx_packets++; 374 dcb_buf->dev->stats.tx_bytes += dcb_buf->skb->len; 375 376 dcb_buf->used = false; 377 dma_unmap_single(lan966x->dev, 378 dcb_buf->dma_addr, 379 dcb_buf->skb->len, 380 DMA_TO_DEVICE); 381 if (!dcb_buf->ptp) 382 dev_kfree_skb_any(dcb_buf->skb); 383 384 clear = true; 385 } 386 387 if (clear) 388 lan966x_fdma_wakeup_netdev(lan966x); 389 390 spin_unlock_irqrestore(&lan966x->tx_lock, flags); 391 } 392 393 static bool lan966x_fdma_rx_more_frames(struct lan966x_rx *rx) 394 { 395 struct lan966x_db *db; 396 397 /* Check if there is any data */ 398 db = &rx->dcbs[rx->dcb_index].db[rx->db_index]; 399 if (unlikely(!(db->status & FDMA_DCB_STATUS_DONE))) 400 return false; 401 402 return true; 403 } 404 405 static struct sk_buff *lan966x_fdma_rx_get_frame(struct lan966x_rx *rx) 406 { 407 struct lan966x *lan966x = rx->lan966x; 408 u64 src_port, timestamp; 409 struct lan966x_db *db; 410 struct sk_buff *skb; 411 struct page *page; 412 413 /* Get the received frame and unmap it */ 414 db = &rx->dcbs[rx->dcb_index].db[rx->db_index]; 415 page = rx->page[rx->dcb_index][rx->db_index]; 416 skb = build_skb(page_address(page), PAGE_SIZE << rx->page_order); 417 if (unlikely(!skb)) 418 goto unmap_page; 419 420 dma_unmap_single(lan966x->dev, (dma_addr_t)db->dataptr, 421 FDMA_DCB_STATUS_BLOCKL(db->status), 422 DMA_FROM_DEVICE); 423 skb_put(skb, FDMA_DCB_STATUS_BLOCKL(db->status)); 424 425 lan966x_ifh_get_src_port(skb->data, &src_port); 426 lan966x_ifh_get_timestamp(skb->data, ×tamp); 427 428 if (WARN_ON(src_port >= lan966x->num_phys_ports)) 429 goto free_skb; 430 431 skb->dev = lan966x->ports[src_port]->dev; 432 skb_pull(skb, IFH_LEN * sizeof(u32)); 433 434 if (likely(!(skb->dev->features & NETIF_F_RXFCS))) 435 skb_trim(skb, skb->len - ETH_FCS_LEN); 436 437 lan966x_ptp_rxtstamp(lan966x, skb, timestamp); 438 skb->protocol = eth_type_trans(skb, skb->dev); 439 440 if (lan966x->bridge_mask & BIT(src_port)) { 441 skb->offload_fwd_mark = 1; 442 443 skb_reset_network_header(skb); 444 if (!lan966x_hw_offload(lan966x, src_port, skb)) 445 skb->offload_fwd_mark = 0; 446 } 447 448 skb->dev->stats.rx_bytes += skb->len; 449 skb->dev->stats.rx_packets++; 450 451 return skb; 452 453 free_skb: 454 kfree_skb(skb); 455 unmap_page: 456 dma_unmap_page(lan966x->dev, (dma_addr_t)db->dataptr, 457 FDMA_DCB_STATUS_BLOCKL(db->status), 458 DMA_FROM_DEVICE); 459 __free_pages(page, rx->page_order); 460 461 return NULL; 462 } 463 464 static int lan966x_fdma_napi_poll(struct napi_struct *napi, int weight) 465 { 466 struct lan966x *lan966x = container_of(napi, struct lan966x, napi); 467 struct lan966x_rx *rx = &lan966x->rx; 468 int dcb_reload = rx->dcb_index; 469 struct lan966x_rx_dcb *old_dcb; 470 struct lan966x_db *db; 471 struct sk_buff *skb; 472 struct page *page; 473 int counter = 0; 474 u64 nextptr; 475 476 lan966x_fdma_tx_clear_buf(lan966x, weight); 477 478 /* Get all received skb */ 479 while (counter < weight) { 480 if (!lan966x_fdma_rx_more_frames(rx)) 481 break; 482 483 skb = lan966x_fdma_rx_get_frame(rx); 484 485 rx->page[rx->dcb_index][rx->db_index] = NULL; 486 rx->dcb_index++; 487 rx->dcb_index &= FDMA_DCB_MAX - 1; 488 489 if (!skb) 490 break; 491 492 napi_gro_receive(&lan966x->napi, skb); 493 counter++; 494 } 495 496 /* Allocate new pages and map them */ 497 while (dcb_reload != rx->dcb_index) { 498 db = &rx->dcbs[dcb_reload].db[rx->db_index]; 499 page = lan966x_fdma_rx_alloc_page(rx, db); 500 if (unlikely(!page)) 501 break; 502 rx->page[dcb_reload][rx->db_index] = page; 503 504 old_dcb = &rx->dcbs[dcb_reload]; 505 dcb_reload++; 506 dcb_reload &= FDMA_DCB_MAX - 1; 507 508 nextptr = rx->dma + ((unsigned long)old_dcb - 509 (unsigned long)rx->dcbs); 510 lan966x_fdma_rx_add_dcb(rx, old_dcb, nextptr); 511 lan966x_fdma_rx_reload(rx); 512 } 513 514 if (counter < weight && napi_complete_done(napi, counter)) 515 lan_wr(0xff, lan966x, FDMA_INTR_DB_ENA); 516 517 return counter; 518 } 519 520 irqreturn_t lan966x_fdma_irq_handler(int irq, void *args) 521 { 522 struct lan966x *lan966x = args; 523 u32 db, err, err_type; 524 525 db = lan_rd(lan966x, FDMA_INTR_DB); 526 err = lan_rd(lan966x, FDMA_INTR_ERR); 527 528 if (db) { 529 lan_wr(0, lan966x, FDMA_INTR_DB_ENA); 530 lan_wr(db, lan966x, FDMA_INTR_DB); 531 532 napi_schedule(&lan966x->napi); 533 } 534 535 if (err) { 536 err_type = lan_rd(lan966x, FDMA_ERRORS); 537 538 WARN(1, "Unexpected error: %d, error_type: %d\n", err, err_type); 539 540 lan_wr(err, lan966x, FDMA_INTR_ERR); 541 lan_wr(err_type, lan966x, FDMA_ERRORS); 542 } 543 544 return IRQ_HANDLED; 545 } 546 547 static int lan966x_fdma_get_next_dcb(struct lan966x_tx *tx) 548 { 549 struct lan966x_tx_dcb_buf *dcb_buf; 550 int i; 551 552 for (i = 0; i < FDMA_DCB_MAX; ++i) { 553 dcb_buf = &tx->dcbs_buf[i]; 554 if (!dcb_buf->used && i != tx->last_in_use) 555 return i; 556 } 557 558 return -1; 559 } 560 561 int lan966x_fdma_xmit(struct sk_buff *skb, __be32 *ifh, struct net_device *dev) 562 { 563 struct lan966x_port *port = netdev_priv(dev); 564 struct lan966x *lan966x = port->lan966x; 565 struct lan966x_tx_dcb_buf *next_dcb_buf; 566 struct lan966x_tx_dcb *next_dcb, *dcb; 567 struct lan966x_tx *tx = &lan966x->tx; 568 struct lan966x_db *next_db; 569 int needed_headroom; 570 int needed_tailroom; 571 dma_addr_t dma_addr; 572 int next_to_use; 573 int err; 574 575 /* Get next index */ 576 next_to_use = lan966x_fdma_get_next_dcb(tx); 577 if (next_to_use < 0) { 578 netif_stop_queue(dev); 579 return NETDEV_TX_BUSY; 580 } 581 582 if (skb_put_padto(skb, ETH_ZLEN)) { 583 dev->stats.tx_dropped++; 584 return NETDEV_TX_OK; 585 } 586 587 /* skb processing */ 588 needed_headroom = max_t(int, IFH_LEN * sizeof(u32) - skb_headroom(skb), 0); 589 needed_tailroom = max_t(int, ETH_FCS_LEN - skb_tailroom(skb), 0); 590 if (needed_headroom || needed_tailroom || skb_header_cloned(skb)) { 591 err = pskb_expand_head(skb, needed_headroom, needed_tailroom, 592 GFP_ATOMIC); 593 if (unlikely(err)) { 594 dev->stats.tx_dropped++; 595 err = NETDEV_TX_OK; 596 goto release; 597 } 598 } 599 600 skb_tx_timestamp(skb); 601 skb_push(skb, IFH_LEN * sizeof(u32)); 602 memcpy(skb->data, ifh, IFH_LEN * sizeof(u32)); 603 skb_put(skb, 4); 604 605 dma_addr = dma_map_single(lan966x->dev, skb->data, skb->len, 606 DMA_TO_DEVICE); 607 if (dma_mapping_error(lan966x->dev, dma_addr)) { 608 dev->stats.tx_dropped++; 609 err = NETDEV_TX_OK; 610 goto release; 611 } 612 613 /* Setup next dcb */ 614 next_dcb = &tx->dcbs[next_to_use]; 615 next_dcb->nextptr = FDMA_DCB_INVALID_DATA; 616 617 next_db = &next_dcb->db[0]; 618 next_db->dataptr = dma_addr; 619 next_db->status = FDMA_DCB_STATUS_SOF | 620 FDMA_DCB_STATUS_EOF | 621 FDMA_DCB_STATUS_INTR | 622 FDMA_DCB_STATUS_BLOCKO(0) | 623 FDMA_DCB_STATUS_BLOCKL(skb->len); 624 625 /* Fill up the buffer */ 626 next_dcb_buf = &tx->dcbs_buf[next_to_use]; 627 next_dcb_buf->skb = skb; 628 next_dcb_buf->dma_addr = dma_addr; 629 next_dcb_buf->used = true; 630 next_dcb_buf->ptp = false; 631 next_dcb_buf->dev = dev; 632 633 if (skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP && 634 LAN966X_SKB_CB(skb)->rew_op == IFH_REW_OP_TWO_STEP_PTP) 635 next_dcb_buf->ptp = true; 636 637 if (likely(lan966x->tx.activated)) { 638 /* Connect current dcb to the next db */ 639 dcb = &tx->dcbs[tx->last_in_use]; 640 dcb->nextptr = tx->dma + (next_to_use * 641 sizeof(struct lan966x_tx_dcb)); 642 643 lan966x_fdma_tx_reload(tx); 644 } else { 645 /* Because it is first time, then just activate */ 646 lan966x->tx.activated = true; 647 lan966x_fdma_tx_activate(tx); 648 } 649 650 /* Move to next dcb because this last in use */ 651 tx->last_in_use = next_to_use; 652 653 return NETDEV_TX_OK; 654 655 release: 656 if (skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP && 657 LAN966X_SKB_CB(skb)->rew_op == IFH_REW_OP_TWO_STEP_PTP) 658 lan966x_ptp_txtstamp_release(port, skb); 659 660 dev_kfree_skb_any(skb); 661 return err; 662 } 663 664 static int lan966x_fdma_get_max_mtu(struct lan966x *lan966x) 665 { 666 int max_mtu = 0; 667 int i; 668 669 for (i = 0; i < lan966x->num_phys_ports; ++i) { 670 int mtu; 671 672 if (!lan966x->ports[i]) 673 continue; 674 675 mtu = lan966x->ports[i]->dev->mtu; 676 if (mtu > max_mtu) 677 max_mtu = mtu; 678 } 679 680 return max_mtu; 681 } 682 683 static int lan966x_qsys_sw_status(struct lan966x *lan966x) 684 { 685 return lan_rd(lan966x, QSYS_SW_STATUS(CPU_PORT)); 686 } 687 688 static int lan966x_fdma_reload(struct lan966x *lan966x, int new_mtu) 689 { 690 void *rx_dcbs, *tx_dcbs, *tx_dcbs_buf; 691 dma_addr_t rx_dma, tx_dma; 692 u32 size; 693 int err; 694 695 /* Store these for later to free them */ 696 rx_dma = lan966x->rx.dma; 697 tx_dma = lan966x->tx.dma; 698 rx_dcbs = lan966x->rx.dcbs; 699 tx_dcbs = lan966x->tx.dcbs; 700 tx_dcbs_buf = lan966x->tx.dcbs_buf; 701 702 napi_synchronize(&lan966x->napi); 703 napi_disable(&lan966x->napi); 704 lan966x_fdma_stop_netdev(lan966x); 705 706 lan966x_fdma_rx_disable(&lan966x->rx); 707 lan966x_fdma_rx_free_pages(&lan966x->rx); 708 lan966x->rx.page_order = round_up(new_mtu, PAGE_SIZE) / PAGE_SIZE - 1; 709 err = lan966x_fdma_rx_alloc(&lan966x->rx); 710 if (err) 711 goto restore; 712 lan966x_fdma_rx_start(&lan966x->rx); 713 714 size = sizeof(struct lan966x_rx_dcb) * FDMA_DCB_MAX; 715 size = ALIGN(size, PAGE_SIZE); 716 dma_free_coherent(lan966x->dev, size, rx_dcbs, rx_dma); 717 718 lan966x_fdma_tx_disable(&lan966x->tx); 719 err = lan966x_fdma_tx_alloc(&lan966x->tx); 720 if (err) 721 goto restore_tx; 722 723 size = sizeof(struct lan966x_tx_dcb) * FDMA_DCB_MAX; 724 size = ALIGN(size, PAGE_SIZE); 725 dma_free_coherent(lan966x->dev, size, tx_dcbs, tx_dma); 726 727 kfree(tx_dcbs_buf); 728 729 lan966x_fdma_wakeup_netdev(lan966x); 730 napi_enable(&lan966x->napi); 731 732 return err; 733 restore: 734 lan966x->rx.dma = rx_dma; 735 lan966x->rx.dcbs = rx_dcbs; 736 lan966x_fdma_rx_start(&lan966x->rx); 737 738 restore_tx: 739 lan966x->tx.dma = tx_dma; 740 lan966x->tx.dcbs = tx_dcbs; 741 lan966x->tx.dcbs_buf = tx_dcbs_buf; 742 743 return err; 744 } 745 746 int lan966x_fdma_change_mtu(struct lan966x *lan966x) 747 { 748 int max_mtu; 749 int err; 750 u32 val; 751 752 max_mtu = lan966x_fdma_get_max_mtu(lan966x); 753 max_mtu += IFH_LEN * sizeof(u32); 754 755 if (round_up(max_mtu, PAGE_SIZE) / PAGE_SIZE - 1 == 756 lan966x->rx.page_order) 757 return 0; 758 759 /* Disable the CPU port */ 760 lan_rmw(QSYS_SW_PORT_MODE_PORT_ENA_SET(0), 761 QSYS_SW_PORT_MODE_PORT_ENA, 762 lan966x, QSYS_SW_PORT_MODE(CPU_PORT)); 763 764 /* Flush the CPU queues */ 765 readx_poll_timeout(lan966x_qsys_sw_status, lan966x, 766 val, !(QSYS_SW_STATUS_EQ_AVAIL_GET(val)), 767 READL_SLEEP_US, READL_TIMEOUT_US); 768 769 /* Add a sleep in case there are frames between the queues and the CPU 770 * port 771 */ 772 usleep_range(1000, 2000); 773 774 err = lan966x_fdma_reload(lan966x, max_mtu); 775 776 /* Enable back the CPU port */ 777 lan_rmw(QSYS_SW_PORT_MODE_PORT_ENA_SET(1), 778 QSYS_SW_PORT_MODE_PORT_ENA, 779 lan966x, QSYS_SW_PORT_MODE(CPU_PORT)); 780 781 return err; 782 } 783 784 void lan966x_fdma_netdev_init(struct lan966x *lan966x, struct net_device *dev) 785 { 786 if (lan966x->fdma_ndev) 787 return; 788 789 lan966x->fdma_ndev = dev; 790 netif_napi_add(dev, &lan966x->napi, lan966x_fdma_napi_poll, 791 NAPI_POLL_WEIGHT); 792 napi_enable(&lan966x->napi); 793 } 794 795 void lan966x_fdma_netdev_deinit(struct lan966x *lan966x, struct net_device *dev) 796 { 797 if (lan966x->fdma_ndev == dev) { 798 netif_napi_del(&lan966x->napi); 799 lan966x->fdma_ndev = NULL; 800 } 801 } 802 803 int lan966x_fdma_init(struct lan966x *lan966x) 804 { 805 int err; 806 807 if (!lan966x->fdma) 808 return 0; 809 810 lan966x->rx.lan966x = lan966x; 811 lan966x->rx.channel_id = FDMA_XTR_CHANNEL; 812 lan966x->tx.lan966x = lan966x; 813 lan966x->tx.channel_id = FDMA_INJ_CHANNEL; 814 lan966x->tx.last_in_use = -1; 815 816 err = lan966x_fdma_rx_alloc(&lan966x->rx); 817 if (err) 818 return err; 819 820 err = lan966x_fdma_tx_alloc(&lan966x->tx); 821 if (err) { 822 lan966x_fdma_rx_free(&lan966x->rx); 823 return err; 824 } 825 826 lan966x_fdma_rx_start(&lan966x->rx); 827 828 return 0; 829 } 830 831 void lan966x_fdma_deinit(struct lan966x *lan966x) 832 { 833 if (!lan966x->fdma) 834 return; 835 836 lan966x_fdma_rx_disable(&lan966x->rx); 837 lan966x_fdma_tx_disable(&lan966x->tx); 838 839 napi_synchronize(&lan966x->napi); 840 napi_disable(&lan966x->napi); 841 842 lan966x_fdma_rx_free_pages(&lan966x->rx); 843 lan966x_fdma_rx_free(&lan966x->rx); 844 lan966x_fdma_tx_free(&lan966x->tx); 845 } 846