1 // SPDX-License-Identifier: GPL-2.0 2 /* Copyright (C) 2021 Gerhard Engleder <gerhard@engleder-embedded.com> */ 3 4 /* TSN endpoint Ethernet MAC driver 5 * 6 * The TSN endpoint Ethernet MAC is a FPGA based network device for real-time 7 * communication. It is designed for endpoints within TSN (Time Sensitive 8 * Networking) networks; e.g., for PLCs in the industrial automation case. 9 * 10 * It supports multiple TX/RX queue pairs. The first TX/RX queue pair is used 11 * by the driver. 12 * 13 * More information can be found here: 14 * - www.embedded-experts.at/tsn 15 * - www.engleder-embedded.com 16 */ 17 18 #include "tsnep.h" 19 #include "tsnep_hw.h" 20 21 #include <linux/module.h> 22 #include <linux/of.h> 23 #include <linux/of_net.h> 24 #include <linux/of_mdio.h> 25 #include <linux/interrupt.h> 26 #include <linux/etherdevice.h> 27 #include <linux/phy.h> 28 #include <linux/iopoll.h> 29 #include <linux/bpf.h> 30 #include <linux/bpf_trace.h> 31 #include <net/page_pool/helpers.h> 32 #include <net/xdp_sock_drv.h> 33 34 #define TSNEP_RX_OFFSET (max(NET_SKB_PAD, XDP_PACKET_HEADROOM) + NET_IP_ALIGN) 35 #define TSNEP_HEADROOM ALIGN(TSNEP_RX_OFFSET, 4) 36 #define TSNEP_MAX_RX_BUF_SIZE (PAGE_SIZE - TSNEP_HEADROOM - \ 37 SKB_DATA_ALIGN(sizeof(struct skb_shared_info))) 38 /* XSK buffer shall store at least Q-in-Q frame */ 39 #define TSNEP_XSK_RX_BUF_SIZE (ALIGN(TSNEP_RX_INLINE_METADATA_SIZE + \ 40 ETH_FRAME_LEN + ETH_FCS_LEN + \ 41 VLAN_HLEN * 2, 4)) 42 43 #ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT 44 #define DMA_ADDR_HIGH(dma_addr) ((u32)(((dma_addr) >> 32) & 0xFFFFFFFF)) 45 #else 46 #define DMA_ADDR_HIGH(dma_addr) ((u32)(0)) 47 #endif 48 #define DMA_ADDR_LOW(dma_addr) ((u32)((dma_addr) & 0xFFFFFFFF)) 49 50 #define TSNEP_COALESCE_USECS_DEFAULT 64 51 #define TSNEP_COALESCE_USECS_MAX ((ECM_INT_DELAY_MASK >> ECM_INT_DELAY_SHIFT) * \ 52 ECM_INT_DELAY_BASE_US + ECM_INT_DELAY_BASE_US - 1) 53 54 /* mapping type */ 55 #define TSNEP_TX_TYPE_MAP BIT(0) 56 #define TSNEP_TX_TYPE_MAP_PAGE BIT(1) 57 #define TSNEP_TX_TYPE_INLINE BIT(2) 58 /* buffer type */ 59 #define TSNEP_TX_TYPE_SKB BIT(8) 60 #define TSNEP_TX_TYPE_SKB_MAP (TSNEP_TX_TYPE_SKB | TSNEP_TX_TYPE_MAP) 61 #define TSNEP_TX_TYPE_SKB_INLINE (TSNEP_TX_TYPE_SKB | TSNEP_TX_TYPE_INLINE) 62 #define TSNEP_TX_TYPE_SKB_FRAG BIT(9) 63 #define TSNEP_TX_TYPE_SKB_FRAG_MAP_PAGE (TSNEP_TX_TYPE_SKB_FRAG | TSNEP_TX_TYPE_MAP_PAGE) 64 #define TSNEP_TX_TYPE_SKB_FRAG_INLINE (TSNEP_TX_TYPE_SKB_FRAG | TSNEP_TX_TYPE_INLINE) 65 #define TSNEP_TX_TYPE_XDP_TX BIT(10) 66 #define TSNEP_TX_TYPE_XDP_NDO BIT(11) 67 #define TSNEP_TX_TYPE_XDP_NDO_MAP_PAGE (TSNEP_TX_TYPE_XDP_NDO | TSNEP_TX_TYPE_MAP_PAGE) 68 #define TSNEP_TX_TYPE_XDP (TSNEP_TX_TYPE_XDP_TX | TSNEP_TX_TYPE_XDP_NDO) 69 #define TSNEP_TX_TYPE_XSK BIT(12) 70 71 #define TSNEP_XDP_TX BIT(0) 72 #define TSNEP_XDP_REDIRECT BIT(1) 73 74 static void tsnep_enable_irq(struct tsnep_adapter *adapter, u32 mask) 75 { 76 iowrite32(mask, adapter->addr + ECM_INT_ENABLE); 77 } 78 79 static void tsnep_disable_irq(struct tsnep_adapter *adapter, u32 mask) 80 { 81 mask |= ECM_INT_DISABLE; 82 iowrite32(mask, adapter->addr + ECM_INT_ENABLE); 83 } 84 85 static irqreturn_t tsnep_irq(int irq, void *arg) 86 { 87 struct tsnep_adapter *adapter = arg; 88 u32 active = ioread32(adapter->addr + ECM_INT_ACTIVE); 89 90 /* acknowledge interrupt */ 91 if (active != 0) 92 iowrite32(active, adapter->addr + ECM_INT_ACKNOWLEDGE); 93 94 /* handle link interrupt */ 95 if ((active & ECM_INT_LINK) != 0) 96 phy_mac_interrupt(adapter->netdev->phydev); 97 98 /* handle TX/RX queue 0 interrupt */ 99 if ((active & adapter->queue[0].irq_mask) != 0) { 100 if (napi_schedule_prep(&adapter->queue[0].napi)) { 101 tsnep_disable_irq(adapter, adapter->queue[0].irq_mask); 102 /* schedule after masking to avoid races */ 103 __napi_schedule(&adapter->queue[0].napi); 104 } 105 } 106 107 return IRQ_HANDLED; 108 } 109 110 static irqreturn_t tsnep_irq_txrx(int irq, void *arg) 111 { 112 struct tsnep_queue *queue = arg; 113 114 /* handle TX/RX queue interrupt */ 115 if (napi_schedule_prep(&queue->napi)) { 116 tsnep_disable_irq(queue->adapter, queue->irq_mask); 117 /* schedule after masking to avoid races */ 118 __napi_schedule(&queue->napi); 119 } 120 121 return IRQ_HANDLED; 122 } 123 124 int tsnep_set_irq_coalesce(struct tsnep_queue *queue, u32 usecs) 125 { 126 if (usecs > TSNEP_COALESCE_USECS_MAX) 127 return -ERANGE; 128 129 usecs /= ECM_INT_DELAY_BASE_US; 130 usecs <<= ECM_INT_DELAY_SHIFT; 131 usecs &= ECM_INT_DELAY_MASK; 132 133 queue->irq_delay &= ~ECM_INT_DELAY_MASK; 134 queue->irq_delay |= usecs; 135 iowrite8(queue->irq_delay, queue->irq_delay_addr); 136 137 return 0; 138 } 139 140 u32 tsnep_get_irq_coalesce(struct tsnep_queue *queue) 141 { 142 u32 usecs; 143 144 usecs = (queue->irq_delay & ECM_INT_DELAY_MASK); 145 usecs >>= ECM_INT_DELAY_SHIFT; 146 usecs *= ECM_INT_DELAY_BASE_US; 147 148 return usecs; 149 } 150 151 static int tsnep_mdiobus_read(struct mii_bus *bus, int addr, int regnum) 152 { 153 struct tsnep_adapter *adapter = bus->priv; 154 u32 md; 155 int retval; 156 157 md = ECM_MD_READ; 158 if (!adapter->suppress_preamble) 159 md |= ECM_MD_PREAMBLE; 160 md |= (regnum << ECM_MD_ADDR_SHIFT) & ECM_MD_ADDR_MASK; 161 md |= (addr << ECM_MD_PHY_ADDR_SHIFT) & ECM_MD_PHY_ADDR_MASK; 162 iowrite32(md, adapter->addr + ECM_MD_CONTROL); 163 retval = readl_poll_timeout_atomic(adapter->addr + ECM_MD_STATUS, md, 164 !(md & ECM_MD_BUSY), 16, 1000); 165 if (retval != 0) 166 return retval; 167 168 return (md & ECM_MD_DATA_MASK) >> ECM_MD_DATA_SHIFT; 169 } 170 171 static int tsnep_mdiobus_write(struct mii_bus *bus, int addr, int regnum, 172 u16 val) 173 { 174 struct tsnep_adapter *adapter = bus->priv; 175 u32 md; 176 int retval; 177 178 md = ECM_MD_WRITE; 179 if (!adapter->suppress_preamble) 180 md |= ECM_MD_PREAMBLE; 181 md |= (regnum << ECM_MD_ADDR_SHIFT) & ECM_MD_ADDR_MASK; 182 md |= (addr << ECM_MD_PHY_ADDR_SHIFT) & ECM_MD_PHY_ADDR_MASK; 183 md |= ((u32)val << ECM_MD_DATA_SHIFT) & ECM_MD_DATA_MASK; 184 iowrite32(md, adapter->addr + ECM_MD_CONTROL); 185 retval = readl_poll_timeout_atomic(adapter->addr + ECM_MD_STATUS, md, 186 !(md & ECM_MD_BUSY), 16, 1000); 187 if (retval != 0) 188 return retval; 189 190 return 0; 191 } 192 193 static void tsnep_set_link_mode(struct tsnep_adapter *adapter) 194 { 195 u32 mode; 196 197 switch (adapter->phydev->speed) { 198 case SPEED_100: 199 mode = ECM_LINK_MODE_100; 200 break; 201 case SPEED_1000: 202 mode = ECM_LINK_MODE_1000; 203 break; 204 default: 205 mode = ECM_LINK_MODE_OFF; 206 break; 207 } 208 iowrite32(mode, adapter->addr + ECM_STATUS); 209 } 210 211 static void tsnep_phy_link_status_change(struct net_device *netdev) 212 { 213 struct tsnep_adapter *adapter = netdev_priv(netdev); 214 struct phy_device *phydev = netdev->phydev; 215 216 if (phydev->link) 217 tsnep_set_link_mode(adapter); 218 219 phy_print_status(netdev->phydev); 220 } 221 222 static int tsnep_phy_loopback(struct tsnep_adapter *adapter, bool enable) 223 { 224 int retval; 225 226 retval = phy_loopback(adapter->phydev, enable); 227 228 /* PHY link state change is not signaled if loopback is enabled, it 229 * would delay a working loopback anyway, let's ensure that loopback 230 * is working immediately by setting link mode directly 231 */ 232 if (!retval && enable) { 233 netif_carrier_on(adapter->netdev); 234 tsnep_set_link_mode(adapter); 235 } 236 237 return retval; 238 } 239 240 static int tsnep_phy_open(struct tsnep_adapter *adapter) 241 { 242 struct phy_device *phydev; 243 struct ethtool_keee ethtool_keee; 244 int retval; 245 246 retval = phy_connect_direct(adapter->netdev, adapter->phydev, 247 tsnep_phy_link_status_change, 248 adapter->phy_mode); 249 if (retval) 250 return retval; 251 phydev = adapter->netdev->phydev; 252 253 /* MAC supports only 100Mbps|1000Mbps full duplex 254 * SPE (Single Pair Ethernet) is also an option but not implemented yet 255 */ 256 phy_remove_link_mode(phydev, ETHTOOL_LINK_MODE_10baseT_Half_BIT); 257 phy_remove_link_mode(phydev, ETHTOOL_LINK_MODE_10baseT_Full_BIT); 258 phy_remove_link_mode(phydev, ETHTOOL_LINK_MODE_100baseT_Half_BIT); 259 phy_remove_link_mode(phydev, ETHTOOL_LINK_MODE_1000baseT_Half_BIT); 260 261 /* disable EEE autoneg, EEE not supported by TSNEP */ 262 memset(ðtool_keee, 0, sizeof(ethtool_keee)); 263 phy_ethtool_set_eee(adapter->phydev, ðtool_keee); 264 265 adapter->phydev->irq = PHY_MAC_INTERRUPT; 266 phy_start(adapter->phydev); 267 268 return 0; 269 } 270 271 static void tsnep_phy_close(struct tsnep_adapter *adapter) 272 { 273 phy_stop(adapter->netdev->phydev); 274 phy_disconnect(adapter->netdev->phydev); 275 } 276 277 static void tsnep_tx_ring_cleanup(struct tsnep_tx *tx) 278 { 279 struct device *dmadev = tx->adapter->dmadev; 280 int i; 281 282 memset(tx->entry, 0, sizeof(tx->entry)); 283 284 for (i = 0; i < TSNEP_RING_PAGE_COUNT; i++) { 285 if (tx->page[i]) { 286 dma_free_coherent(dmadev, PAGE_SIZE, tx->page[i], 287 tx->page_dma[i]); 288 tx->page[i] = NULL; 289 tx->page_dma[i] = 0; 290 } 291 } 292 } 293 294 static int tsnep_tx_ring_create(struct tsnep_tx *tx) 295 { 296 struct device *dmadev = tx->adapter->dmadev; 297 struct tsnep_tx_entry *entry; 298 struct tsnep_tx_entry *next_entry; 299 int i, j; 300 int retval; 301 302 for (i = 0; i < TSNEP_RING_PAGE_COUNT; i++) { 303 tx->page[i] = 304 dma_alloc_coherent(dmadev, PAGE_SIZE, &tx->page_dma[i], 305 GFP_KERNEL); 306 if (!tx->page[i]) { 307 retval = -ENOMEM; 308 goto alloc_failed; 309 } 310 for (j = 0; j < TSNEP_RING_ENTRIES_PER_PAGE; j++) { 311 entry = &tx->entry[TSNEP_RING_ENTRIES_PER_PAGE * i + j]; 312 entry->desc_wb = (struct tsnep_tx_desc_wb *) 313 (((u8 *)tx->page[i]) + TSNEP_DESC_SIZE * j); 314 entry->desc = (struct tsnep_tx_desc *) 315 (((u8 *)entry->desc_wb) + TSNEP_DESC_OFFSET); 316 entry->desc_dma = tx->page_dma[i] + TSNEP_DESC_SIZE * j; 317 entry->owner_user_flag = false; 318 } 319 } 320 for (i = 0; i < TSNEP_RING_SIZE; i++) { 321 entry = &tx->entry[i]; 322 next_entry = &tx->entry[(i + 1) & TSNEP_RING_MASK]; 323 entry->desc->next = __cpu_to_le64(next_entry->desc_dma); 324 } 325 326 return 0; 327 328 alloc_failed: 329 tsnep_tx_ring_cleanup(tx); 330 return retval; 331 } 332 333 static void tsnep_tx_init(struct tsnep_tx *tx) 334 { 335 dma_addr_t dma; 336 337 dma = tx->entry[0].desc_dma | TSNEP_RESET_OWNER_COUNTER; 338 iowrite32(DMA_ADDR_LOW(dma), tx->addr + TSNEP_TX_DESC_ADDR_LOW); 339 iowrite32(DMA_ADDR_HIGH(dma), tx->addr + TSNEP_TX_DESC_ADDR_HIGH); 340 tx->write = 0; 341 tx->read = 0; 342 tx->owner_counter = 1; 343 tx->increment_owner_counter = TSNEP_RING_SIZE - 1; 344 } 345 346 static void tsnep_tx_enable(struct tsnep_tx *tx) 347 { 348 struct netdev_queue *nq; 349 350 nq = netdev_get_tx_queue(tx->adapter->netdev, tx->queue_index); 351 352 __netif_tx_lock_bh(nq); 353 netif_tx_wake_queue(nq); 354 __netif_tx_unlock_bh(nq); 355 } 356 357 static void tsnep_tx_disable(struct tsnep_tx *tx, struct napi_struct *napi) 358 { 359 struct netdev_queue *nq; 360 u32 val; 361 362 nq = netdev_get_tx_queue(tx->adapter->netdev, tx->queue_index); 363 364 __netif_tx_lock_bh(nq); 365 netif_tx_stop_queue(nq); 366 __netif_tx_unlock_bh(nq); 367 368 /* wait until TX is done in hardware */ 369 readx_poll_timeout(ioread32, tx->addr + TSNEP_CONTROL, val, 370 ((val & TSNEP_CONTROL_TX_ENABLE) == 0), 10000, 371 1000000); 372 373 /* wait until TX is also done in software */ 374 while (READ_ONCE(tx->read) != tx->write) { 375 napi_schedule(napi); 376 napi_synchronize(napi); 377 } 378 } 379 380 static void tsnep_tx_activate(struct tsnep_tx *tx, int index, int length, 381 bool last) 382 { 383 struct tsnep_tx_entry *entry = &tx->entry[index]; 384 385 entry->properties = 0; 386 /* xdpf and zc are union with skb */ 387 if (entry->skb) { 388 entry->properties = length & TSNEP_DESC_LENGTH_MASK; 389 entry->properties |= TSNEP_DESC_INTERRUPT_FLAG; 390 if ((entry->type & TSNEP_TX_TYPE_SKB) && 391 (skb_shinfo(entry->skb)->tx_flags & SKBTX_IN_PROGRESS)) 392 entry->properties |= TSNEP_DESC_EXTENDED_WRITEBACK_FLAG; 393 394 /* toggle user flag to prevent false acknowledge 395 * 396 * Only the first fragment is acknowledged. For all other 397 * fragments no acknowledge is done and the last written owner 398 * counter stays in the writeback descriptor. Therefore, it is 399 * possible that the last written owner counter is identical to 400 * the new incremented owner counter and a false acknowledge is 401 * detected before the real acknowledge has been done by 402 * hardware. 403 * 404 * The user flag is used to prevent this situation. The user 405 * flag is copied to the writeback descriptor by the hardware 406 * and is used as additional acknowledge data. By toggeling the 407 * user flag only for the first fragment (which is 408 * acknowledged), it is guaranteed that the last acknowledge 409 * done for this descriptor has used a different user flag and 410 * cannot be detected as false acknowledge. 411 */ 412 entry->owner_user_flag = !entry->owner_user_flag; 413 } 414 if (last) 415 entry->properties |= TSNEP_TX_DESC_LAST_FRAGMENT_FLAG; 416 if (index == tx->increment_owner_counter) { 417 tx->owner_counter++; 418 if (tx->owner_counter == 4) 419 tx->owner_counter = 1; 420 tx->increment_owner_counter--; 421 if (tx->increment_owner_counter < 0) 422 tx->increment_owner_counter = TSNEP_RING_SIZE - 1; 423 } 424 entry->properties |= 425 (tx->owner_counter << TSNEP_DESC_OWNER_COUNTER_SHIFT) & 426 TSNEP_DESC_OWNER_COUNTER_MASK; 427 if (entry->owner_user_flag) 428 entry->properties |= TSNEP_TX_DESC_OWNER_USER_FLAG; 429 entry->desc->more_properties = 430 __cpu_to_le32(entry->len & TSNEP_DESC_LENGTH_MASK); 431 if (entry->type & TSNEP_TX_TYPE_INLINE) 432 entry->properties |= TSNEP_TX_DESC_DATA_AFTER_DESC_FLAG; 433 434 /* descriptor properties shall be written last, because valid data is 435 * signaled there 436 */ 437 dma_wmb(); 438 439 entry->desc->properties = __cpu_to_le32(entry->properties); 440 } 441 442 static int tsnep_tx_desc_available(struct tsnep_tx *tx) 443 { 444 if (tx->read <= tx->write) 445 return TSNEP_RING_SIZE - tx->write + tx->read - 1; 446 else 447 return tx->read - tx->write - 1; 448 } 449 450 static int tsnep_tx_map_frag(skb_frag_t *frag, struct tsnep_tx_entry *entry, 451 struct device *dmadev, dma_addr_t *dma) 452 { 453 unsigned int len; 454 int mapped; 455 456 len = skb_frag_size(frag); 457 if (likely(len > TSNEP_DESC_SIZE_DATA_AFTER_INLINE)) { 458 *dma = skb_frag_dma_map(dmadev, frag, 0, len, DMA_TO_DEVICE); 459 if (dma_mapping_error(dmadev, *dma)) 460 return -ENOMEM; 461 entry->type = TSNEP_TX_TYPE_SKB_FRAG_MAP_PAGE; 462 mapped = 1; 463 } else { 464 void *fragdata = skb_frag_address_safe(frag); 465 466 if (likely(fragdata)) { 467 memcpy(&entry->desc->tx, fragdata, len); 468 } else { 469 struct page *page = skb_frag_page(frag); 470 471 fragdata = kmap_local_page(page); 472 memcpy(&entry->desc->tx, fragdata + skb_frag_off(frag), 473 len); 474 kunmap_local(fragdata); 475 } 476 entry->type = TSNEP_TX_TYPE_SKB_FRAG_INLINE; 477 mapped = 0; 478 } 479 480 return mapped; 481 } 482 483 static int tsnep_tx_map(struct sk_buff *skb, struct tsnep_tx *tx, int count) 484 { 485 struct device *dmadev = tx->adapter->dmadev; 486 struct tsnep_tx_entry *entry; 487 unsigned int len; 488 int map_len = 0; 489 dma_addr_t dma; 490 int i, mapped; 491 492 for (i = 0; i < count; i++) { 493 entry = &tx->entry[(tx->write + i) & TSNEP_RING_MASK]; 494 495 if (!i) { 496 len = skb_headlen(skb); 497 if (likely(len > TSNEP_DESC_SIZE_DATA_AFTER_INLINE)) { 498 dma = dma_map_single(dmadev, skb->data, len, 499 DMA_TO_DEVICE); 500 if (dma_mapping_error(dmadev, dma)) 501 return -ENOMEM; 502 entry->type = TSNEP_TX_TYPE_SKB_MAP; 503 mapped = 1; 504 } else { 505 memcpy(&entry->desc->tx, skb->data, len); 506 entry->type = TSNEP_TX_TYPE_SKB_INLINE; 507 mapped = 0; 508 } 509 } else { 510 skb_frag_t *frag = &skb_shinfo(skb)->frags[i - 1]; 511 512 len = skb_frag_size(frag); 513 mapped = tsnep_tx_map_frag(frag, entry, dmadev, &dma); 514 if (mapped < 0) 515 return mapped; 516 } 517 518 entry->len = len; 519 if (likely(mapped)) { 520 dma_unmap_addr_set(entry, dma, dma); 521 entry->desc->tx = __cpu_to_le64(dma); 522 } 523 524 map_len += len; 525 } 526 527 return map_len; 528 } 529 530 static int tsnep_tx_unmap(struct tsnep_tx *tx, int index, int count) 531 { 532 struct device *dmadev = tx->adapter->dmadev; 533 struct tsnep_tx_entry *entry; 534 int map_len = 0; 535 int i; 536 537 for (i = 0; i < count; i++) { 538 entry = &tx->entry[(index + i) & TSNEP_RING_MASK]; 539 540 if (entry->len) { 541 if (entry->type & TSNEP_TX_TYPE_MAP) 542 dma_unmap_single(dmadev, 543 dma_unmap_addr(entry, dma), 544 dma_unmap_len(entry, len), 545 DMA_TO_DEVICE); 546 else if (entry->type & TSNEP_TX_TYPE_MAP_PAGE) 547 dma_unmap_page(dmadev, 548 dma_unmap_addr(entry, dma), 549 dma_unmap_len(entry, len), 550 DMA_TO_DEVICE); 551 map_len += entry->len; 552 entry->len = 0; 553 } 554 } 555 556 return map_len; 557 } 558 559 static netdev_tx_t tsnep_xmit_frame_ring(struct sk_buff *skb, 560 struct tsnep_tx *tx) 561 { 562 int count = 1; 563 struct tsnep_tx_entry *entry; 564 int length; 565 int i; 566 int retval; 567 568 if (skb_shinfo(skb)->nr_frags > 0) 569 count += skb_shinfo(skb)->nr_frags; 570 571 if (tsnep_tx_desc_available(tx) < count) { 572 /* ring full, shall not happen because queue is stopped if full 573 * below 574 */ 575 netif_stop_subqueue(tx->adapter->netdev, tx->queue_index); 576 577 return NETDEV_TX_BUSY; 578 } 579 580 entry = &tx->entry[tx->write]; 581 entry->skb = skb; 582 583 retval = tsnep_tx_map(skb, tx, count); 584 if (retval < 0) { 585 tsnep_tx_unmap(tx, tx->write, count); 586 dev_kfree_skb_any(entry->skb); 587 entry->skb = NULL; 588 589 tx->dropped++; 590 591 return NETDEV_TX_OK; 592 } 593 length = retval; 594 595 if (skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP) 596 skb_shinfo(skb)->tx_flags |= SKBTX_IN_PROGRESS; 597 598 for (i = 0; i < count; i++) 599 tsnep_tx_activate(tx, (tx->write + i) & TSNEP_RING_MASK, length, 600 i == count - 1); 601 tx->write = (tx->write + count) & TSNEP_RING_MASK; 602 603 skb_tx_timestamp(skb); 604 605 /* descriptor properties shall be valid before hardware is notified */ 606 dma_wmb(); 607 608 iowrite32(TSNEP_CONTROL_TX_ENABLE, tx->addr + TSNEP_CONTROL); 609 610 if (tsnep_tx_desc_available(tx) < (MAX_SKB_FRAGS + 1)) { 611 /* ring can get full with next frame */ 612 netif_stop_subqueue(tx->adapter->netdev, tx->queue_index); 613 } 614 615 return NETDEV_TX_OK; 616 } 617 618 static int tsnep_xdp_tx_map(struct xdp_frame *xdpf, struct tsnep_tx *tx, 619 struct skb_shared_info *shinfo, int count, u32 type) 620 { 621 struct device *dmadev = tx->adapter->dmadev; 622 struct tsnep_tx_entry *entry; 623 struct page *page; 624 skb_frag_t *frag; 625 unsigned int len; 626 int map_len = 0; 627 dma_addr_t dma; 628 void *data; 629 int i; 630 631 frag = NULL; 632 len = xdpf->len; 633 for (i = 0; i < count; i++) { 634 entry = &tx->entry[(tx->write + i) & TSNEP_RING_MASK]; 635 if (type & TSNEP_TX_TYPE_XDP_NDO) { 636 data = unlikely(frag) ? skb_frag_address(frag) : 637 xdpf->data; 638 dma = dma_map_single(dmadev, data, len, DMA_TO_DEVICE); 639 if (dma_mapping_error(dmadev, dma)) 640 return -ENOMEM; 641 642 entry->type = TSNEP_TX_TYPE_XDP_NDO_MAP_PAGE; 643 } else { 644 page = unlikely(frag) ? skb_frag_page(frag) : 645 virt_to_page(xdpf->data); 646 dma = page_pool_get_dma_addr(page); 647 if (unlikely(frag)) 648 dma += skb_frag_off(frag); 649 else 650 dma += sizeof(*xdpf) + xdpf->headroom; 651 dma_sync_single_for_device(dmadev, dma, len, 652 DMA_BIDIRECTIONAL); 653 654 entry->type = TSNEP_TX_TYPE_XDP_TX; 655 } 656 657 entry->len = len; 658 dma_unmap_addr_set(entry, dma, dma); 659 660 entry->desc->tx = __cpu_to_le64(dma); 661 662 map_len += len; 663 664 if (i + 1 < count) { 665 frag = &shinfo->frags[i]; 666 len = skb_frag_size(frag); 667 } 668 } 669 670 return map_len; 671 } 672 673 /* This function requires __netif_tx_lock is held by the caller. */ 674 static bool tsnep_xdp_xmit_frame_ring(struct xdp_frame *xdpf, 675 struct tsnep_tx *tx, u32 type) 676 { 677 struct skb_shared_info *shinfo = xdp_get_shared_info_from_frame(xdpf); 678 struct tsnep_tx_entry *entry; 679 int count, length, retval, i; 680 681 count = 1; 682 if (unlikely(xdp_frame_has_frags(xdpf))) 683 count += shinfo->nr_frags; 684 685 /* ensure that TX ring is not filled up by XDP, always MAX_SKB_FRAGS 686 * will be available for normal TX path and queue is stopped there if 687 * necessary 688 */ 689 if (tsnep_tx_desc_available(tx) < (MAX_SKB_FRAGS + 1 + count)) 690 return false; 691 692 entry = &tx->entry[tx->write]; 693 entry->xdpf = xdpf; 694 695 retval = tsnep_xdp_tx_map(xdpf, tx, shinfo, count, type); 696 if (retval < 0) { 697 tsnep_tx_unmap(tx, tx->write, count); 698 entry->xdpf = NULL; 699 700 tx->dropped++; 701 702 return false; 703 } 704 length = retval; 705 706 for (i = 0; i < count; i++) 707 tsnep_tx_activate(tx, (tx->write + i) & TSNEP_RING_MASK, length, 708 i == count - 1); 709 tx->write = (tx->write + count) & TSNEP_RING_MASK; 710 711 /* descriptor properties shall be valid before hardware is notified */ 712 dma_wmb(); 713 714 return true; 715 } 716 717 static void tsnep_xdp_xmit_flush(struct tsnep_tx *tx) 718 { 719 iowrite32(TSNEP_CONTROL_TX_ENABLE, tx->addr + TSNEP_CONTROL); 720 } 721 722 static bool tsnep_xdp_xmit_back(struct tsnep_adapter *adapter, 723 struct xdp_buff *xdp, 724 struct netdev_queue *tx_nq, struct tsnep_tx *tx) 725 { 726 struct xdp_frame *xdpf = xdp_convert_buff_to_frame(xdp); 727 bool xmit; 728 729 if (unlikely(!xdpf)) 730 return false; 731 732 __netif_tx_lock(tx_nq, smp_processor_id()); 733 734 xmit = tsnep_xdp_xmit_frame_ring(xdpf, tx, TSNEP_TX_TYPE_XDP_TX); 735 736 /* Avoid transmit queue timeout since we share it with the slow path */ 737 if (xmit) 738 txq_trans_cond_update(tx_nq); 739 740 __netif_tx_unlock(tx_nq); 741 742 return xmit; 743 } 744 745 static int tsnep_xdp_tx_map_zc(struct xdp_desc *xdpd, struct tsnep_tx *tx) 746 { 747 struct tsnep_tx_entry *entry; 748 dma_addr_t dma; 749 750 entry = &tx->entry[tx->write]; 751 entry->zc = true; 752 753 dma = xsk_buff_raw_get_dma(tx->xsk_pool, xdpd->addr); 754 xsk_buff_raw_dma_sync_for_device(tx->xsk_pool, dma, xdpd->len); 755 756 entry->type = TSNEP_TX_TYPE_XSK; 757 entry->len = xdpd->len; 758 759 entry->desc->tx = __cpu_to_le64(dma); 760 761 return xdpd->len; 762 } 763 764 static void tsnep_xdp_xmit_frame_ring_zc(struct xdp_desc *xdpd, 765 struct tsnep_tx *tx) 766 { 767 int length; 768 769 length = tsnep_xdp_tx_map_zc(xdpd, tx); 770 771 tsnep_tx_activate(tx, tx->write, length, true); 772 tx->write = (tx->write + 1) & TSNEP_RING_MASK; 773 } 774 775 static void tsnep_xdp_xmit_zc(struct tsnep_tx *tx) 776 { 777 int desc_available = tsnep_tx_desc_available(tx); 778 struct xdp_desc *descs = tx->xsk_pool->tx_descs; 779 int batch, i; 780 781 /* ensure that TX ring is not filled up by XDP, always MAX_SKB_FRAGS 782 * will be available for normal TX path and queue is stopped there if 783 * necessary 784 */ 785 if (desc_available <= (MAX_SKB_FRAGS + 1)) 786 return; 787 desc_available -= MAX_SKB_FRAGS + 1; 788 789 batch = xsk_tx_peek_release_desc_batch(tx->xsk_pool, desc_available); 790 for (i = 0; i < batch; i++) 791 tsnep_xdp_xmit_frame_ring_zc(&descs[i], tx); 792 793 if (batch) { 794 /* descriptor properties shall be valid before hardware is 795 * notified 796 */ 797 dma_wmb(); 798 799 tsnep_xdp_xmit_flush(tx); 800 } 801 } 802 803 static bool tsnep_tx_poll(struct tsnep_tx *tx, int napi_budget) 804 { 805 struct tsnep_tx_entry *entry; 806 struct netdev_queue *nq; 807 int xsk_frames = 0; 808 int budget = 128; 809 int length; 810 int count; 811 812 nq = netdev_get_tx_queue(tx->adapter->netdev, tx->queue_index); 813 __netif_tx_lock(nq, smp_processor_id()); 814 815 do { 816 if (tx->read == tx->write) 817 break; 818 819 entry = &tx->entry[tx->read]; 820 if ((__le32_to_cpu(entry->desc_wb->properties) & 821 TSNEP_TX_DESC_OWNER_MASK) != 822 (entry->properties & TSNEP_TX_DESC_OWNER_MASK)) 823 break; 824 825 /* descriptor properties shall be read first, because valid data 826 * is signaled there 827 */ 828 dma_rmb(); 829 830 count = 1; 831 if ((entry->type & TSNEP_TX_TYPE_SKB) && 832 skb_shinfo(entry->skb)->nr_frags > 0) 833 count += skb_shinfo(entry->skb)->nr_frags; 834 else if ((entry->type & TSNEP_TX_TYPE_XDP) && 835 xdp_frame_has_frags(entry->xdpf)) 836 count += xdp_get_shared_info_from_frame(entry->xdpf)->nr_frags; 837 838 length = tsnep_tx_unmap(tx, tx->read, count); 839 840 if ((entry->type & TSNEP_TX_TYPE_SKB) && 841 (skb_shinfo(entry->skb)->tx_flags & SKBTX_IN_PROGRESS) && 842 (__le32_to_cpu(entry->desc_wb->properties) & 843 TSNEP_DESC_EXTENDED_WRITEBACK_FLAG)) { 844 struct skb_shared_hwtstamps hwtstamps; 845 u64 timestamp; 846 847 if (skb_shinfo(entry->skb)->tx_flags & 848 SKBTX_HW_TSTAMP_USE_CYCLES) 849 timestamp = 850 __le64_to_cpu(entry->desc_wb->counter); 851 else 852 timestamp = 853 __le64_to_cpu(entry->desc_wb->timestamp); 854 855 memset(&hwtstamps, 0, sizeof(hwtstamps)); 856 hwtstamps.hwtstamp = ns_to_ktime(timestamp); 857 858 skb_tstamp_tx(entry->skb, &hwtstamps); 859 } 860 861 if (entry->type & TSNEP_TX_TYPE_SKB) 862 napi_consume_skb(entry->skb, napi_budget); 863 else if (entry->type & TSNEP_TX_TYPE_XDP) 864 xdp_return_frame_rx_napi(entry->xdpf); 865 else 866 xsk_frames++; 867 /* xdpf and zc are union with skb */ 868 entry->skb = NULL; 869 870 tx->read = (tx->read + count) & TSNEP_RING_MASK; 871 872 tx->packets++; 873 tx->bytes += length + ETH_FCS_LEN; 874 875 budget--; 876 } while (likely(budget)); 877 878 if (tx->xsk_pool) { 879 if (xsk_frames) 880 xsk_tx_completed(tx->xsk_pool, xsk_frames); 881 if (xsk_uses_need_wakeup(tx->xsk_pool)) 882 xsk_set_tx_need_wakeup(tx->xsk_pool); 883 tsnep_xdp_xmit_zc(tx); 884 } 885 886 if ((tsnep_tx_desc_available(tx) >= ((MAX_SKB_FRAGS + 1) * 2)) && 887 netif_tx_queue_stopped(nq)) { 888 netif_tx_wake_queue(nq); 889 } 890 891 __netif_tx_unlock(nq); 892 893 return budget != 0; 894 } 895 896 static bool tsnep_tx_pending(struct tsnep_tx *tx) 897 { 898 struct tsnep_tx_entry *entry; 899 struct netdev_queue *nq; 900 bool pending = false; 901 902 nq = netdev_get_tx_queue(tx->adapter->netdev, tx->queue_index); 903 __netif_tx_lock(nq, smp_processor_id()); 904 905 if (tx->read != tx->write) { 906 entry = &tx->entry[tx->read]; 907 if ((__le32_to_cpu(entry->desc_wb->properties) & 908 TSNEP_TX_DESC_OWNER_MASK) == 909 (entry->properties & TSNEP_TX_DESC_OWNER_MASK)) 910 pending = true; 911 } 912 913 __netif_tx_unlock(nq); 914 915 return pending; 916 } 917 918 static int tsnep_tx_open(struct tsnep_tx *tx) 919 { 920 int retval; 921 922 retval = tsnep_tx_ring_create(tx); 923 if (retval) 924 return retval; 925 926 tsnep_tx_init(tx); 927 928 return 0; 929 } 930 931 static void tsnep_tx_close(struct tsnep_tx *tx) 932 { 933 tsnep_tx_ring_cleanup(tx); 934 } 935 936 static void tsnep_rx_ring_cleanup(struct tsnep_rx *rx) 937 { 938 struct device *dmadev = rx->adapter->dmadev; 939 struct tsnep_rx_entry *entry; 940 int i; 941 942 for (i = 0; i < TSNEP_RING_SIZE; i++) { 943 entry = &rx->entry[i]; 944 if (!rx->xsk_pool && entry->page) 945 page_pool_put_full_page(rx->page_pool, entry->page, 946 false); 947 if (rx->xsk_pool && entry->xdp) 948 xsk_buff_free(entry->xdp); 949 /* xdp is union with page */ 950 entry->page = NULL; 951 } 952 953 if (rx->page_pool) 954 page_pool_destroy(rx->page_pool); 955 956 memset(rx->entry, 0, sizeof(rx->entry)); 957 958 for (i = 0; i < TSNEP_RING_PAGE_COUNT; i++) { 959 if (rx->page[i]) { 960 dma_free_coherent(dmadev, PAGE_SIZE, rx->page[i], 961 rx->page_dma[i]); 962 rx->page[i] = NULL; 963 rx->page_dma[i] = 0; 964 } 965 } 966 } 967 968 static int tsnep_rx_ring_create(struct tsnep_rx *rx) 969 { 970 struct device *dmadev = rx->adapter->dmadev; 971 struct tsnep_rx_entry *entry; 972 struct page_pool_params pp_params = { 0 }; 973 struct tsnep_rx_entry *next_entry; 974 int i, j; 975 int retval; 976 977 for (i = 0; i < TSNEP_RING_PAGE_COUNT; i++) { 978 rx->page[i] = 979 dma_alloc_coherent(dmadev, PAGE_SIZE, &rx->page_dma[i], 980 GFP_KERNEL); 981 if (!rx->page[i]) { 982 retval = -ENOMEM; 983 goto failed; 984 } 985 for (j = 0; j < TSNEP_RING_ENTRIES_PER_PAGE; j++) { 986 entry = &rx->entry[TSNEP_RING_ENTRIES_PER_PAGE * i + j]; 987 entry->desc_wb = (struct tsnep_rx_desc_wb *) 988 (((u8 *)rx->page[i]) + TSNEP_DESC_SIZE * j); 989 entry->desc = (struct tsnep_rx_desc *) 990 (((u8 *)entry->desc_wb) + TSNEP_DESC_OFFSET); 991 entry->desc_dma = rx->page_dma[i] + TSNEP_DESC_SIZE * j; 992 } 993 } 994 995 pp_params.flags = PP_FLAG_DMA_MAP | PP_FLAG_DMA_SYNC_DEV; 996 pp_params.order = 0; 997 pp_params.pool_size = TSNEP_RING_SIZE; 998 pp_params.nid = dev_to_node(dmadev); 999 pp_params.dev = dmadev; 1000 pp_params.dma_dir = DMA_BIDIRECTIONAL; 1001 pp_params.max_len = TSNEP_MAX_RX_BUF_SIZE; 1002 pp_params.offset = TSNEP_RX_OFFSET; 1003 rx->page_pool = page_pool_create(&pp_params); 1004 if (IS_ERR(rx->page_pool)) { 1005 retval = PTR_ERR(rx->page_pool); 1006 rx->page_pool = NULL; 1007 goto failed; 1008 } 1009 1010 for (i = 0; i < TSNEP_RING_SIZE; i++) { 1011 entry = &rx->entry[i]; 1012 next_entry = &rx->entry[(i + 1) & TSNEP_RING_MASK]; 1013 entry->desc->next = __cpu_to_le64(next_entry->desc_dma); 1014 } 1015 1016 return 0; 1017 1018 failed: 1019 tsnep_rx_ring_cleanup(rx); 1020 return retval; 1021 } 1022 1023 static void tsnep_rx_init(struct tsnep_rx *rx) 1024 { 1025 dma_addr_t dma; 1026 1027 dma = rx->entry[0].desc_dma | TSNEP_RESET_OWNER_COUNTER; 1028 iowrite32(DMA_ADDR_LOW(dma), rx->addr + TSNEP_RX_DESC_ADDR_LOW); 1029 iowrite32(DMA_ADDR_HIGH(dma), rx->addr + TSNEP_RX_DESC_ADDR_HIGH); 1030 rx->write = 0; 1031 rx->read = 0; 1032 rx->owner_counter = 1; 1033 rx->increment_owner_counter = TSNEP_RING_SIZE - 1; 1034 } 1035 1036 static void tsnep_rx_enable(struct tsnep_rx *rx) 1037 { 1038 /* descriptor properties shall be valid before hardware is notified */ 1039 dma_wmb(); 1040 1041 iowrite32(TSNEP_CONTROL_RX_ENABLE, rx->addr + TSNEP_CONTROL); 1042 } 1043 1044 static void tsnep_rx_disable(struct tsnep_rx *rx) 1045 { 1046 u32 val; 1047 1048 iowrite32(TSNEP_CONTROL_RX_DISABLE, rx->addr + TSNEP_CONTROL); 1049 readx_poll_timeout(ioread32, rx->addr + TSNEP_CONTROL, val, 1050 ((val & TSNEP_CONTROL_RX_ENABLE) == 0), 10000, 1051 1000000); 1052 } 1053 1054 static int tsnep_rx_desc_available(struct tsnep_rx *rx) 1055 { 1056 if (rx->read <= rx->write) 1057 return TSNEP_RING_SIZE - rx->write + rx->read - 1; 1058 else 1059 return rx->read - rx->write - 1; 1060 } 1061 1062 static void tsnep_rx_free_page_buffer(struct tsnep_rx *rx) 1063 { 1064 struct page **page; 1065 1066 /* last entry of page_buffer is always zero, because ring cannot be 1067 * filled completely 1068 */ 1069 page = rx->page_buffer; 1070 while (*page) { 1071 page_pool_put_full_page(rx->page_pool, *page, false); 1072 *page = NULL; 1073 page++; 1074 } 1075 } 1076 1077 static int tsnep_rx_alloc_page_buffer(struct tsnep_rx *rx) 1078 { 1079 int i; 1080 1081 /* alloc for all ring entries except the last one, because ring cannot 1082 * be filled completely 1083 */ 1084 for (i = 0; i < TSNEP_RING_SIZE - 1; i++) { 1085 rx->page_buffer[i] = page_pool_dev_alloc_pages(rx->page_pool); 1086 if (!rx->page_buffer[i]) { 1087 tsnep_rx_free_page_buffer(rx); 1088 1089 return -ENOMEM; 1090 } 1091 } 1092 1093 return 0; 1094 } 1095 1096 static void tsnep_rx_set_page(struct tsnep_rx *rx, struct tsnep_rx_entry *entry, 1097 struct page *page) 1098 { 1099 entry->page = page; 1100 entry->len = TSNEP_MAX_RX_BUF_SIZE; 1101 entry->dma = page_pool_get_dma_addr(entry->page); 1102 entry->desc->rx = __cpu_to_le64(entry->dma + TSNEP_RX_OFFSET); 1103 } 1104 1105 static int tsnep_rx_alloc_buffer(struct tsnep_rx *rx, int index) 1106 { 1107 struct tsnep_rx_entry *entry = &rx->entry[index]; 1108 struct page *page; 1109 1110 page = page_pool_dev_alloc_pages(rx->page_pool); 1111 if (unlikely(!page)) 1112 return -ENOMEM; 1113 tsnep_rx_set_page(rx, entry, page); 1114 1115 return 0; 1116 } 1117 1118 static void tsnep_rx_reuse_buffer(struct tsnep_rx *rx, int index) 1119 { 1120 struct tsnep_rx_entry *entry = &rx->entry[index]; 1121 struct tsnep_rx_entry *read = &rx->entry[rx->read]; 1122 1123 tsnep_rx_set_page(rx, entry, read->page); 1124 read->page = NULL; 1125 } 1126 1127 static void tsnep_rx_activate(struct tsnep_rx *rx, int index) 1128 { 1129 struct tsnep_rx_entry *entry = &rx->entry[index]; 1130 1131 /* TSNEP_MAX_RX_BUF_SIZE and TSNEP_XSK_RX_BUF_SIZE are multiple of 4 */ 1132 entry->properties = entry->len & TSNEP_DESC_LENGTH_MASK; 1133 entry->properties |= TSNEP_DESC_INTERRUPT_FLAG; 1134 if (index == rx->increment_owner_counter) { 1135 rx->owner_counter++; 1136 if (rx->owner_counter == 4) 1137 rx->owner_counter = 1; 1138 rx->increment_owner_counter--; 1139 if (rx->increment_owner_counter < 0) 1140 rx->increment_owner_counter = TSNEP_RING_SIZE - 1; 1141 } 1142 entry->properties |= 1143 (rx->owner_counter << TSNEP_DESC_OWNER_COUNTER_SHIFT) & 1144 TSNEP_DESC_OWNER_COUNTER_MASK; 1145 1146 /* descriptor properties shall be written last, because valid data is 1147 * signaled there 1148 */ 1149 dma_wmb(); 1150 1151 entry->desc->properties = __cpu_to_le32(entry->properties); 1152 } 1153 1154 static int tsnep_rx_alloc(struct tsnep_rx *rx, int count, bool reuse) 1155 { 1156 bool alloc_failed = false; 1157 int i, index; 1158 1159 for (i = 0; i < count && !alloc_failed; i++) { 1160 index = (rx->write + i) & TSNEP_RING_MASK; 1161 1162 if (unlikely(tsnep_rx_alloc_buffer(rx, index))) { 1163 rx->alloc_failed++; 1164 alloc_failed = true; 1165 1166 /* reuse only if no other allocation was successful */ 1167 if (i == 0 && reuse) 1168 tsnep_rx_reuse_buffer(rx, index); 1169 else 1170 break; 1171 } 1172 1173 tsnep_rx_activate(rx, index); 1174 } 1175 1176 if (i) 1177 rx->write = (rx->write + i) & TSNEP_RING_MASK; 1178 1179 return i; 1180 } 1181 1182 static int tsnep_rx_refill(struct tsnep_rx *rx, int count, bool reuse) 1183 { 1184 int desc_refilled; 1185 1186 desc_refilled = tsnep_rx_alloc(rx, count, reuse); 1187 if (desc_refilled) 1188 tsnep_rx_enable(rx); 1189 1190 return desc_refilled; 1191 } 1192 1193 static void tsnep_rx_set_xdp(struct tsnep_rx *rx, struct tsnep_rx_entry *entry, 1194 struct xdp_buff *xdp) 1195 { 1196 entry->xdp = xdp; 1197 entry->len = TSNEP_XSK_RX_BUF_SIZE; 1198 entry->dma = xsk_buff_xdp_get_dma(entry->xdp); 1199 entry->desc->rx = __cpu_to_le64(entry->dma); 1200 } 1201 1202 static void tsnep_rx_reuse_buffer_zc(struct tsnep_rx *rx, int index) 1203 { 1204 struct tsnep_rx_entry *entry = &rx->entry[index]; 1205 struct tsnep_rx_entry *read = &rx->entry[rx->read]; 1206 1207 tsnep_rx_set_xdp(rx, entry, read->xdp); 1208 read->xdp = NULL; 1209 } 1210 1211 static int tsnep_rx_alloc_zc(struct tsnep_rx *rx, int count, bool reuse) 1212 { 1213 u32 allocated; 1214 int i; 1215 1216 allocated = xsk_buff_alloc_batch(rx->xsk_pool, rx->xdp_batch, count); 1217 for (i = 0; i < allocated; i++) { 1218 int index = (rx->write + i) & TSNEP_RING_MASK; 1219 struct tsnep_rx_entry *entry = &rx->entry[index]; 1220 1221 tsnep_rx_set_xdp(rx, entry, rx->xdp_batch[i]); 1222 tsnep_rx_activate(rx, index); 1223 } 1224 if (i == 0) { 1225 rx->alloc_failed++; 1226 1227 if (reuse) { 1228 tsnep_rx_reuse_buffer_zc(rx, rx->write); 1229 tsnep_rx_activate(rx, rx->write); 1230 } 1231 } 1232 1233 if (i) 1234 rx->write = (rx->write + i) & TSNEP_RING_MASK; 1235 1236 return i; 1237 } 1238 1239 static void tsnep_rx_free_zc(struct tsnep_rx *rx) 1240 { 1241 int i; 1242 1243 for (i = 0; i < TSNEP_RING_SIZE; i++) { 1244 struct tsnep_rx_entry *entry = &rx->entry[i]; 1245 1246 if (entry->xdp) 1247 xsk_buff_free(entry->xdp); 1248 entry->xdp = NULL; 1249 } 1250 } 1251 1252 static int tsnep_rx_refill_zc(struct tsnep_rx *rx, int count, bool reuse) 1253 { 1254 int desc_refilled; 1255 1256 desc_refilled = tsnep_rx_alloc_zc(rx, count, reuse); 1257 if (desc_refilled) 1258 tsnep_rx_enable(rx); 1259 1260 return desc_refilled; 1261 } 1262 1263 static void tsnep_xsk_rx_need_wakeup(struct tsnep_rx *rx, int desc_available) 1264 { 1265 if (desc_available) 1266 xsk_set_rx_need_wakeup(rx->xsk_pool); 1267 else 1268 xsk_clear_rx_need_wakeup(rx->xsk_pool); 1269 } 1270 1271 static bool tsnep_xdp_run_prog(struct tsnep_rx *rx, struct bpf_prog *prog, 1272 struct xdp_buff *xdp, int *status, 1273 struct netdev_queue *tx_nq, struct tsnep_tx *tx) 1274 { 1275 unsigned int length; 1276 unsigned int sync; 1277 u32 act; 1278 1279 length = xdp->data_end - xdp->data_hard_start - XDP_PACKET_HEADROOM; 1280 1281 act = bpf_prog_run_xdp(prog, xdp); 1282 switch (act) { 1283 case XDP_PASS: 1284 return false; 1285 case XDP_TX: 1286 if (!tsnep_xdp_xmit_back(rx->adapter, xdp, tx_nq, tx)) 1287 goto out_failure; 1288 *status |= TSNEP_XDP_TX; 1289 return true; 1290 case XDP_REDIRECT: 1291 if (xdp_do_redirect(rx->adapter->netdev, xdp, prog) < 0) 1292 goto out_failure; 1293 *status |= TSNEP_XDP_REDIRECT; 1294 return true; 1295 default: 1296 bpf_warn_invalid_xdp_action(rx->adapter->netdev, prog, act); 1297 fallthrough; 1298 case XDP_ABORTED: 1299 out_failure: 1300 trace_xdp_exception(rx->adapter->netdev, prog, act); 1301 fallthrough; 1302 case XDP_DROP: 1303 /* Due xdp_adjust_tail: DMA sync for_device cover max len CPU 1304 * touch 1305 */ 1306 sync = xdp->data_end - xdp->data_hard_start - 1307 XDP_PACKET_HEADROOM; 1308 sync = max(sync, length); 1309 page_pool_put_page(rx->page_pool, virt_to_head_page(xdp->data), 1310 sync, true); 1311 return true; 1312 } 1313 } 1314 1315 static bool tsnep_xdp_run_prog_zc(struct tsnep_rx *rx, struct bpf_prog *prog, 1316 struct xdp_buff *xdp, int *status, 1317 struct netdev_queue *tx_nq, 1318 struct tsnep_tx *tx) 1319 { 1320 u32 act; 1321 1322 act = bpf_prog_run_xdp(prog, xdp); 1323 1324 /* XDP_REDIRECT is the main action for zero-copy */ 1325 if (likely(act == XDP_REDIRECT)) { 1326 if (xdp_do_redirect(rx->adapter->netdev, xdp, prog) < 0) 1327 goto out_failure; 1328 *status |= TSNEP_XDP_REDIRECT; 1329 return true; 1330 } 1331 1332 switch (act) { 1333 case XDP_PASS: 1334 return false; 1335 case XDP_TX: 1336 if (!tsnep_xdp_xmit_back(rx->adapter, xdp, tx_nq, tx)) 1337 goto out_failure; 1338 *status |= TSNEP_XDP_TX; 1339 return true; 1340 default: 1341 bpf_warn_invalid_xdp_action(rx->adapter->netdev, prog, act); 1342 fallthrough; 1343 case XDP_ABORTED: 1344 out_failure: 1345 trace_xdp_exception(rx->adapter->netdev, prog, act); 1346 fallthrough; 1347 case XDP_DROP: 1348 xsk_buff_free(xdp); 1349 return true; 1350 } 1351 } 1352 1353 static void tsnep_finalize_xdp(struct tsnep_adapter *adapter, int status, 1354 struct netdev_queue *tx_nq, struct tsnep_tx *tx) 1355 { 1356 if (status & TSNEP_XDP_TX) { 1357 __netif_tx_lock(tx_nq, smp_processor_id()); 1358 tsnep_xdp_xmit_flush(tx); 1359 __netif_tx_unlock(tx_nq); 1360 } 1361 1362 if (status & TSNEP_XDP_REDIRECT) 1363 xdp_do_flush(); 1364 } 1365 1366 static struct sk_buff *tsnep_build_skb(struct tsnep_rx *rx, struct page *page, 1367 int length) 1368 { 1369 struct sk_buff *skb; 1370 1371 skb = napi_build_skb(page_address(page), PAGE_SIZE); 1372 if (unlikely(!skb)) 1373 return NULL; 1374 1375 /* update pointers within the skb to store the data */ 1376 skb_reserve(skb, TSNEP_RX_OFFSET + TSNEP_RX_INLINE_METADATA_SIZE); 1377 __skb_put(skb, length - ETH_FCS_LEN); 1378 1379 if (rx->adapter->hwtstamp_config.rx_filter == HWTSTAMP_FILTER_ALL) { 1380 struct skb_shared_hwtstamps *hwtstamps = skb_hwtstamps(skb); 1381 struct tsnep_rx_inline *rx_inline = 1382 (struct tsnep_rx_inline *)(page_address(page) + 1383 TSNEP_RX_OFFSET); 1384 1385 skb_shinfo(skb)->tx_flags |= 1386 SKBTX_HW_TSTAMP_NETDEV; 1387 memset(hwtstamps, 0, sizeof(*hwtstamps)); 1388 hwtstamps->netdev_data = rx_inline; 1389 } 1390 1391 skb_record_rx_queue(skb, rx->queue_index); 1392 skb->protocol = eth_type_trans(skb, rx->adapter->netdev); 1393 1394 return skb; 1395 } 1396 1397 static void tsnep_rx_page(struct tsnep_rx *rx, struct napi_struct *napi, 1398 struct page *page, int length) 1399 { 1400 struct sk_buff *skb; 1401 1402 skb = tsnep_build_skb(rx, page, length); 1403 if (skb) { 1404 skb_mark_for_recycle(skb); 1405 1406 rx->packets++; 1407 rx->bytes += length; 1408 if (skb->pkt_type == PACKET_MULTICAST) 1409 rx->multicast++; 1410 1411 napi_gro_receive(napi, skb); 1412 } else { 1413 page_pool_recycle_direct(rx->page_pool, page); 1414 1415 rx->dropped++; 1416 } 1417 } 1418 1419 static int tsnep_rx_poll(struct tsnep_rx *rx, struct napi_struct *napi, 1420 int budget) 1421 { 1422 struct device *dmadev = rx->adapter->dmadev; 1423 enum dma_data_direction dma_dir; 1424 struct tsnep_rx_entry *entry; 1425 struct netdev_queue *tx_nq; 1426 struct bpf_prog *prog; 1427 struct xdp_buff xdp; 1428 struct tsnep_tx *tx; 1429 int desc_available; 1430 int xdp_status = 0; 1431 int done = 0; 1432 int length; 1433 1434 desc_available = tsnep_rx_desc_available(rx); 1435 dma_dir = page_pool_get_dma_dir(rx->page_pool); 1436 prog = READ_ONCE(rx->adapter->xdp_prog); 1437 if (prog) { 1438 tx_nq = netdev_get_tx_queue(rx->adapter->netdev, 1439 rx->tx_queue_index); 1440 tx = &rx->adapter->tx[rx->tx_queue_index]; 1441 1442 xdp_init_buff(&xdp, PAGE_SIZE, &rx->xdp_rxq); 1443 } 1444 1445 while (likely(done < budget) && (rx->read != rx->write)) { 1446 entry = &rx->entry[rx->read]; 1447 if ((__le32_to_cpu(entry->desc_wb->properties) & 1448 TSNEP_DESC_OWNER_COUNTER_MASK) != 1449 (entry->properties & TSNEP_DESC_OWNER_COUNTER_MASK)) 1450 break; 1451 done++; 1452 1453 if (desc_available >= TSNEP_RING_RX_REFILL) { 1454 bool reuse = desc_available >= TSNEP_RING_RX_REUSE; 1455 1456 desc_available -= tsnep_rx_refill(rx, desc_available, 1457 reuse); 1458 if (!entry->page) { 1459 /* buffer has been reused for refill to prevent 1460 * empty RX ring, thus buffer cannot be used for 1461 * RX processing 1462 */ 1463 rx->read = (rx->read + 1) & TSNEP_RING_MASK; 1464 desc_available++; 1465 1466 rx->dropped++; 1467 1468 continue; 1469 } 1470 } 1471 1472 /* descriptor properties shall be read first, because valid data 1473 * is signaled there 1474 */ 1475 dma_rmb(); 1476 1477 prefetch(page_address(entry->page) + TSNEP_RX_OFFSET); 1478 length = __le32_to_cpu(entry->desc_wb->properties) & 1479 TSNEP_DESC_LENGTH_MASK; 1480 dma_sync_single_range_for_cpu(dmadev, entry->dma, 1481 TSNEP_RX_OFFSET, length, dma_dir); 1482 1483 /* RX metadata with timestamps is in front of actual data, 1484 * subtract metadata size to get length of actual data and 1485 * consider metadata size as offset of actual data during RX 1486 * processing 1487 */ 1488 length -= TSNEP_RX_INLINE_METADATA_SIZE; 1489 1490 rx->read = (rx->read + 1) & TSNEP_RING_MASK; 1491 desc_available++; 1492 1493 if (prog) { 1494 bool consume; 1495 1496 xdp_prepare_buff(&xdp, page_address(entry->page), 1497 XDP_PACKET_HEADROOM + TSNEP_RX_INLINE_METADATA_SIZE, 1498 length - ETH_FCS_LEN, false); 1499 1500 consume = tsnep_xdp_run_prog(rx, prog, &xdp, 1501 &xdp_status, tx_nq, tx); 1502 if (consume) { 1503 rx->packets++; 1504 rx->bytes += length; 1505 1506 entry->page = NULL; 1507 1508 continue; 1509 } 1510 } 1511 1512 tsnep_rx_page(rx, napi, entry->page, length); 1513 entry->page = NULL; 1514 } 1515 1516 if (xdp_status) 1517 tsnep_finalize_xdp(rx->adapter, xdp_status, tx_nq, tx); 1518 1519 if (desc_available) 1520 tsnep_rx_refill(rx, desc_available, false); 1521 1522 return done; 1523 } 1524 1525 static int tsnep_rx_poll_zc(struct tsnep_rx *rx, struct napi_struct *napi, 1526 int budget) 1527 { 1528 struct tsnep_rx_entry *entry; 1529 struct netdev_queue *tx_nq; 1530 struct bpf_prog *prog; 1531 struct tsnep_tx *tx; 1532 int desc_available; 1533 int xdp_status = 0; 1534 struct page *page; 1535 int done = 0; 1536 int length; 1537 1538 desc_available = tsnep_rx_desc_available(rx); 1539 prog = READ_ONCE(rx->adapter->xdp_prog); 1540 if (prog) { 1541 tx_nq = netdev_get_tx_queue(rx->adapter->netdev, 1542 rx->tx_queue_index); 1543 tx = &rx->adapter->tx[rx->tx_queue_index]; 1544 } 1545 1546 while (likely(done < budget) && (rx->read != rx->write)) { 1547 entry = &rx->entry[rx->read]; 1548 if ((__le32_to_cpu(entry->desc_wb->properties) & 1549 TSNEP_DESC_OWNER_COUNTER_MASK) != 1550 (entry->properties & TSNEP_DESC_OWNER_COUNTER_MASK)) 1551 break; 1552 done++; 1553 1554 if (desc_available >= TSNEP_RING_RX_REFILL) { 1555 bool reuse = desc_available >= TSNEP_RING_RX_REUSE; 1556 1557 desc_available -= tsnep_rx_refill_zc(rx, desc_available, 1558 reuse); 1559 if (!entry->xdp) { 1560 /* buffer has been reused for refill to prevent 1561 * empty RX ring, thus buffer cannot be used for 1562 * RX processing 1563 */ 1564 rx->read = (rx->read + 1) & TSNEP_RING_MASK; 1565 desc_available++; 1566 1567 rx->dropped++; 1568 1569 continue; 1570 } 1571 } 1572 1573 /* descriptor properties shall be read first, because valid data 1574 * is signaled there 1575 */ 1576 dma_rmb(); 1577 1578 prefetch(entry->xdp->data); 1579 length = __le32_to_cpu(entry->desc_wb->properties) & 1580 TSNEP_DESC_LENGTH_MASK; 1581 xsk_buff_set_size(entry->xdp, length - ETH_FCS_LEN); 1582 xsk_buff_dma_sync_for_cpu(entry->xdp, rx->xsk_pool); 1583 1584 /* RX metadata with timestamps is in front of actual data, 1585 * subtract metadata size to get length of actual data and 1586 * consider metadata size as offset of actual data during RX 1587 * processing 1588 */ 1589 length -= TSNEP_RX_INLINE_METADATA_SIZE; 1590 1591 rx->read = (rx->read + 1) & TSNEP_RING_MASK; 1592 desc_available++; 1593 1594 if (prog) { 1595 bool consume; 1596 1597 entry->xdp->data += TSNEP_RX_INLINE_METADATA_SIZE; 1598 entry->xdp->data_meta += TSNEP_RX_INLINE_METADATA_SIZE; 1599 1600 consume = tsnep_xdp_run_prog_zc(rx, prog, entry->xdp, 1601 &xdp_status, tx_nq, tx); 1602 if (consume) { 1603 rx->packets++; 1604 rx->bytes += length; 1605 1606 entry->xdp = NULL; 1607 1608 continue; 1609 } 1610 } 1611 1612 page = page_pool_dev_alloc_pages(rx->page_pool); 1613 if (page) { 1614 memcpy(page_address(page) + TSNEP_RX_OFFSET, 1615 entry->xdp->data - TSNEP_RX_INLINE_METADATA_SIZE, 1616 length + TSNEP_RX_INLINE_METADATA_SIZE); 1617 tsnep_rx_page(rx, napi, page, length); 1618 } else { 1619 rx->dropped++; 1620 } 1621 xsk_buff_free(entry->xdp); 1622 entry->xdp = NULL; 1623 } 1624 1625 if (xdp_status) 1626 tsnep_finalize_xdp(rx->adapter, xdp_status, tx_nq, tx); 1627 1628 if (desc_available) 1629 desc_available -= tsnep_rx_refill_zc(rx, desc_available, false); 1630 1631 if (xsk_uses_need_wakeup(rx->xsk_pool)) { 1632 tsnep_xsk_rx_need_wakeup(rx, desc_available); 1633 1634 return done; 1635 } 1636 1637 return desc_available ? budget : done; 1638 } 1639 1640 static bool tsnep_rx_pending(struct tsnep_rx *rx) 1641 { 1642 struct tsnep_rx_entry *entry; 1643 1644 if (rx->read != rx->write) { 1645 entry = &rx->entry[rx->read]; 1646 if ((__le32_to_cpu(entry->desc_wb->properties) & 1647 TSNEP_DESC_OWNER_COUNTER_MASK) == 1648 (entry->properties & TSNEP_DESC_OWNER_COUNTER_MASK)) 1649 return true; 1650 } 1651 1652 return false; 1653 } 1654 1655 static int tsnep_rx_open(struct tsnep_rx *rx) 1656 { 1657 int desc_available; 1658 int retval; 1659 1660 retval = tsnep_rx_ring_create(rx); 1661 if (retval) 1662 return retval; 1663 1664 tsnep_rx_init(rx); 1665 1666 desc_available = tsnep_rx_desc_available(rx); 1667 if (rx->xsk_pool) 1668 retval = tsnep_rx_alloc_zc(rx, desc_available, false); 1669 else 1670 retval = tsnep_rx_alloc(rx, desc_available, false); 1671 if (retval != desc_available) { 1672 retval = -ENOMEM; 1673 1674 goto alloc_failed; 1675 } 1676 1677 /* prealloc pages to prevent allocation failures when XSK pool is 1678 * disabled at runtime 1679 */ 1680 if (rx->xsk_pool) { 1681 retval = tsnep_rx_alloc_page_buffer(rx); 1682 if (retval) 1683 goto alloc_failed; 1684 } 1685 1686 return 0; 1687 1688 alloc_failed: 1689 tsnep_rx_ring_cleanup(rx); 1690 return retval; 1691 } 1692 1693 static void tsnep_rx_close(struct tsnep_rx *rx) 1694 { 1695 if (rx->xsk_pool) 1696 tsnep_rx_free_page_buffer(rx); 1697 1698 tsnep_rx_ring_cleanup(rx); 1699 } 1700 1701 static void tsnep_rx_reopen(struct tsnep_rx *rx) 1702 { 1703 struct page **page = rx->page_buffer; 1704 int i; 1705 1706 tsnep_rx_init(rx); 1707 1708 for (i = 0; i < TSNEP_RING_SIZE; i++) { 1709 struct tsnep_rx_entry *entry = &rx->entry[i]; 1710 1711 /* defined initial values for properties are required for 1712 * correct owner counter checking 1713 */ 1714 entry->desc->properties = 0; 1715 entry->desc_wb->properties = 0; 1716 1717 /* prevent allocation failures by reusing kept pages */ 1718 if (*page) { 1719 tsnep_rx_set_page(rx, entry, *page); 1720 tsnep_rx_activate(rx, rx->write); 1721 rx->write++; 1722 1723 *page = NULL; 1724 page++; 1725 } 1726 } 1727 } 1728 1729 static void tsnep_rx_reopen_xsk(struct tsnep_rx *rx) 1730 { 1731 struct page **page = rx->page_buffer; 1732 u32 allocated; 1733 int i; 1734 1735 tsnep_rx_init(rx); 1736 1737 /* alloc all ring entries except the last one, because ring cannot be 1738 * filled completely, as many buffers as possible is enough as wakeup is 1739 * done if new buffers are available 1740 */ 1741 allocated = xsk_buff_alloc_batch(rx->xsk_pool, rx->xdp_batch, 1742 TSNEP_RING_SIZE - 1); 1743 1744 for (i = 0; i < TSNEP_RING_SIZE; i++) { 1745 struct tsnep_rx_entry *entry = &rx->entry[i]; 1746 1747 /* keep pages to prevent allocation failures when xsk is 1748 * disabled 1749 */ 1750 if (entry->page) { 1751 *page = entry->page; 1752 entry->page = NULL; 1753 1754 page++; 1755 } 1756 1757 /* defined initial values for properties are required for 1758 * correct owner counter checking 1759 */ 1760 entry->desc->properties = 0; 1761 entry->desc_wb->properties = 0; 1762 1763 if (allocated) { 1764 tsnep_rx_set_xdp(rx, entry, 1765 rx->xdp_batch[allocated - 1]); 1766 tsnep_rx_activate(rx, rx->write); 1767 rx->write++; 1768 1769 allocated--; 1770 } 1771 } 1772 1773 /* set need wakeup flag immediately if ring is not filled completely, 1774 * first polling would be too late as need wakeup signalisation would 1775 * be delayed for an indefinite time 1776 */ 1777 if (xsk_uses_need_wakeup(rx->xsk_pool)) 1778 tsnep_xsk_rx_need_wakeup(rx, tsnep_rx_desc_available(rx)); 1779 } 1780 1781 static bool tsnep_pending(struct tsnep_queue *queue) 1782 { 1783 if (queue->tx && tsnep_tx_pending(queue->tx)) 1784 return true; 1785 1786 if (queue->rx && tsnep_rx_pending(queue->rx)) 1787 return true; 1788 1789 return false; 1790 } 1791 1792 static int tsnep_poll(struct napi_struct *napi, int budget) 1793 { 1794 struct tsnep_queue *queue = container_of(napi, struct tsnep_queue, 1795 napi); 1796 bool complete = true; 1797 int done = 0; 1798 1799 if (queue->tx) 1800 complete = tsnep_tx_poll(queue->tx, budget); 1801 1802 /* handle case where we are called by netpoll with a budget of 0 */ 1803 if (unlikely(budget <= 0)) 1804 return budget; 1805 1806 if (queue->rx) { 1807 done = queue->rx->xsk_pool ? 1808 tsnep_rx_poll_zc(queue->rx, napi, budget) : 1809 tsnep_rx_poll(queue->rx, napi, budget); 1810 if (done >= budget) 1811 complete = false; 1812 } 1813 1814 /* if all work not completed, return budget and keep polling */ 1815 if (!complete) 1816 return budget; 1817 1818 if (likely(napi_complete_done(napi, done))) { 1819 tsnep_enable_irq(queue->adapter, queue->irq_mask); 1820 1821 /* reschedule if work is already pending, prevent rotten packets 1822 * which are transmitted or received after polling but before 1823 * interrupt enable 1824 */ 1825 if (tsnep_pending(queue)) { 1826 tsnep_disable_irq(queue->adapter, queue->irq_mask); 1827 napi_schedule(napi); 1828 } 1829 } 1830 1831 return min(done, budget - 1); 1832 } 1833 1834 static int tsnep_request_irq(struct tsnep_queue *queue, bool first) 1835 { 1836 const char *name = netdev_name(queue->adapter->netdev); 1837 irq_handler_t handler; 1838 void *dev; 1839 int retval; 1840 1841 if (first) { 1842 sprintf(queue->name, "%s-mac", name); 1843 handler = tsnep_irq; 1844 dev = queue->adapter; 1845 } else { 1846 if (queue->tx && queue->rx) 1847 snprintf(queue->name, sizeof(queue->name), "%s-txrx-%d", 1848 name, queue->rx->queue_index); 1849 else if (queue->tx) 1850 snprintf(queue->name, sizeof(queue->name), "%s-tx-%d", 1851 name, queue->tx->queue_index); 1852 else 1853 snprintf(queue->name, sizeof(queue->name), "%s-rx-%d", 1854 name, queue->rx->queue_index); 1855 handler = tsnep_irq_txrx; 1856 dev = queue; 1857 } 1858 1859 retval = request_irq(queue->irq, handler, 0, queue->name, dev); 1860 if (retval) { 1861 /* if name is empty, then interrupt won't be freed */ 1862 memset(queue->name, 0, sizeof(queue->name)); 1863 } 1864 1865 return retval; 1866 } 1867 1868 static void tsnep_free_irq(struct tsnep_queue *queue, bool first) 1869 { 1870 void *dev; 1871 1872 if (!strlen(queue->name)) 1873 return; 1874 1875 if (first) 1876 dev = queue->adapter; 1877 else 1878 dev = queue; 1879 1880 free_irq(queue->irq, dev); 1881 memset(queue->name, 0, sizeof(queue->name)); 1882 } 1883 1884 static void tsnep_queue_close(struct tsnep_queue *queue, bool first) 1885 { 1886 struct tsnep_rx *rx = queue->rx; 1887 1888 tsnep_free_irq(queue, first); 1889 1890 if (rx) { 1891 if (xdp_rxq_info_is_reg(&rx->xdp_rxq)) 1892 xdp_rxq_info_unreg(&rx->xdp_rxq); 1893 if (xdp_rxq_info_is_reg(&rx->xdp_rxq_zc)) 1894 xdp_rxq_info_unreg(&rx->xdp_rxq_zc); 1895 } 1896 1897 netif_napi_del(&queue->napi); 1898 } 1899 1900 static int tsnep_queue_open(struct tsnep_adapter *adapter, 1901 struct tsnep_queue *queue, bool first) 1902 { 1903 struct tsnep_rx *rx = queue->rx; 1904 struct tsnep_tx *tx = queue->tx; 1905 int retval; 1906 1907 netif_napi_add(adapter->netdev, &queue->napi, tsnep_poll); 1908 1909 if (rx) { 1910 /* choose TX queue for XDP_TX */ 1911 if (tx) 1912 rx->tx_queue_index = tx->queue_index; 1913 else if (rx->queue_index < adapter->num_tx_queues) 1914 rx->tx_queue_index = rx->queue_index; 1915 else 1916 rx->tx_queue_index = 0; 1917 1918 /* prepare both memory models to eliminate possible registration 1919 * errors when memory model is switched between page pool and 1920 * XSK pool during runtime 1921 */ 1922 retval = xdp_rxq_info_reg(&rx->xdp_rxq, adapter->netdev, 1923 rx->queue_index, queue->napi.napi_id); 1924 if (retval) 1925 goto failed; 1926 retval = xdp_rxq_info_reg_mem_model(&rx->xdp_rxq, 1927 MEM_TYPE_PAGE_POOL, 1928 rx->page_pool); 1929 if (retval) 1930 goto failed; 1931 retval = xdp_rxq_info_reg(&rx->xdp_rxq_zc, adapter->netdev, 1932 rx->queue_index, queue->napi.napi_id); 1933 if (retval) 1934 goto failed; 1935 retval = xdp_rxq_info_reg_mem_model(&rx->xdp_rxq_zc, 1936 MEM_TYPE_XSK_BUFF_POOL, 1937 NULL); 1938 if (retval) 1939 goto failed; 1940 if (rx->xsk_pool) 1941 xsk_pool_set_rxq_info(rx->xsk_pool, &rx->xdp_rxq_zc); 1942 } 1943 1944 retval = tsnep_request_irq(queue, first); 1945 if (retval) { 1946 netif_err(adapter, drv, adapter->netdev, 1947 "can't get assigned irq %d.\n", queue->irq); 1948 goto failed; 1949 } 1950 1951 return 0; 1952 1953 failed: 1954 tsnep_queue_close(queue, first); 1955 1956 return retval; 1957 } 1958 1959 static void tsnep_queue_enable(struct tsnep_queue *queue) 1960 { 1961 napi_enable(&queue->napi); 1962 tsnep_enable_irq(queue->adapter, queue->irq_mask); 1963 1964 if (queue->tx) 1965 tsnep_tx_enable(queue->tx); 1966 1967 if (queue->rx) 1968 tsnep_rx_enable(queue->rx); 1969 } 1970 1971 static void tsnep_queue_disable(struct tsnep_queue *queue) 1972 { 1973 if (queue->tx) 1974 tsnep_tx_disable(queue->tx, &queue->napi); 1975 1976 napi_disable(&queue->napi); 1977 tsnep_disable_irq(queue->adapter, queue->irq_mask); 1978 1979 /* disable RX after NAPI polling has been disabled, because RX can be 1980 * enabled during NAPI polling 1981 */ 1982 if (queue->rx) 1983 tsnep_rx_disable(queue->rx); 1984 } 1985 1986 static int tsnep_netdev_open(struct net_device *netdev) 1987 { 1988 struct tsnep_adapter *adapter = netdev_priv(netdev); 1989 int i, retval; 1990 1991 for (i = 0; i < adapter->num_queues; i++) { 1992 if (adapter->queue[i].tx) { 1993 retval = tsnep_tx_open(adapter->queue[i].tx); 1994 if (retval) 1995 goto failed; 1996 } 1997 if (adapter->queue[i].rx) { 1998 retval = tsnep_rx_open(adapter->queue[i].rx); 1999 if (retval) 2000 goto failed; 2001 } 2002 2003 retval = tsnep_queue_open(adapter, &adapter->queue[i], i == 0); 2004 if (retval) 2005 goto failed; 2006 } 2007 2008 retval = netif_set_real_num_tx_queues(adapter->netdev, 2009 adapter->num_tx_queues); 2010 if (retval) 2011 goto failed; 2012 retval = netif_set_real_num_rx_queues(adapter->netdev, 2013 adapter->num_rx_queues); 2014 if (retval) 2015 goto failed; 2016 2017 tsnep_enable_irq(adapter, ECM_INT_LINK); 2018 retval = tsnep_phy_open(adapter); 2019 if (retval) 2020 goto phy_failed; 2021 2022 for (i = 0; i < adapter->num_queues; i++) 2023 tsnep_queue_enable(&adapter->queue[i]); 2024 2025 return 0; 2026 2027 phy_failed: 2028 tsnep_disable_irq(adapter, ECM_INT_LINK); 2029 failed: 2030 for (i = 0; i < adapter->num_queues; i++) { 2031 tsnep_queue_close(&adapter->queue[i], i == 0); 2032 2033 if (adapter->queue[i].rx) 2034 tsnep_rx_close(adapter->queue[i].rx); 2035 if (adapter->queue[i].tx) 2036 tsnep_tx_close(adapter->queue[i].tx); 2037 } 2038 return retval; 2039 } 2040 2041 static int tsnep_netdev_close(struct net_device *netdev) 2042 { 2043 struct tsnep_adapter *adapter = netdev_priv(netdev); 2044 int i; 2045 2046 tsnep_disable_irq(adapter, ECM_INT_LINK); 2047 tsnep_phy_close(adapter); 2048 2049 for (i = 0; i < adapter->num_queues; i++) { 2050 tsnep_queue_disable(&adapter->queue[i]); 2051 2052 tsnep_queue_close(&adapter->queue[i], i == 0); 2053 2054 if (adapter->queue[i].rx) 2055 tsnep_rx_close(adapter->queue[i].rx); 2056 if (adapter->queue[i].tx) 2057 tsnep_tx_close(adapter->queue[i].tx); 2058 } 2059 2060 return 0; 2061 } 2062 2063 int tsnep_enable_xsk(struct tsnep_queue *queue, struct xsk_buff_pool *pool) 2064 { 2065 bool running = netif_running(queue->adapter->netdev); 2066 u32 frame_size; 2067 2068 frame_size = xsk_pool_get_rx_frame_size(pool); 2069 if (frame_size < TSNEP_XSK_RX_BUF_SIZE) 2070 return -EOPNOTSUPP; 2071 2072 queue->rx->page_buffer = kcalloc(TSNEP_RING_SIZE, 2073 sizeof(*queue->rx->page_buffer), 2074 GFP_KERNEL); 2075 if (!queue->rx->page_buffer) 2076 return -ENOMEM; 2077 queue->rx->xdp_batch = kcalloc(TSNEP_RING_SIZE, 2078 sizeof(*queue->rx->xdp_batch), 2079 GFP_KERNEL); 2080 if (!queue->rx->xdp_batch) { 2081 kfree(queue->rx->page_buffer); 2082 queue->rx->page_buffer = NULL; 2083 2084 return -ENOMEM; 2085 } 2086 2087 xsk_pool_set_rxq_info(pool, &queue->rx->xdp_rxq_zc); 2088 2089 if (running) 2090 tsnep_queue_disable(queue); 2091 2092 queue->tx->xsk_pool = pool; 2093 queue->rx->xsk_pool = pool; 2094 2095 if (running) { 2096 tsnep_rx_reopen_xsk(queue->rx); 2097 tsnep_queue_enable(queue); 2098 } 2099 2100 return 0; 2101 } 2102 2103 void tsnep_disable_xsk(struct tsnep_queue *queue) 2104 { 2105 bool running = netif_running(queue->adapter->netdev); 2106 2107 if (running) 2108 tsnep_queue_disable(queue); 2109 2110 tsnep_rx_free_zc(queue->rx); 2111 2112 queue->rx->xsk_pool = NULL; 2113 queue->tx->xsk_pool = NULL; 2114 2115 if (running) { 2116 tsnep_rx_reopen(queue->rx); 2117 tsnep_queue_enable(queue); 2118 } 2119 2120 kfree(queue->rx->xdp_batch); 2121 queue->rx->xdp_batch = NULL; 2122 kfree(queue->rx->page_buffer); 2123 queue->rx->page_buffer = NULL; 2124 } 2125 2126 static netdev_tx_t tsnep_netdev_xmit_frame(struct sk_buff *skb, 2127 struct net_device *netdev) 2128 { 2129 struct tsnep_adapter *adapter = netdev_priv(netdev); 2130 u16 queue_mapping = skb_get_queue_mapping(skb); 2131 2132 if (queue_mapping >= adapter->num_tx_queues) 2133 queue_mapping = 0; 2134 2135 return tsnep_xmit_frame_ring(skb, &adapter->tx[queue_mapping]); 2136 } 2137 2138 static int tsnep_netdev_ioctl(struct net_device *netdev, struct ifreq *ifr, 2139 int cmd) 2140 { 2141 if (!netif_running(netdev)) 2142 return -EINVAL; 2143 if (cmd == SIOCSHWTSTAMP || cmd == SIOCGHWTSTAMP) 2144 return tsnep_ptp_ioctl(netdev, ifr, cmd); 2145 return phy_mii_ioctl(netdev->phydev, ifr, cmd); 2146 } 2147 2148 static void tsnep_netdev_set_multicast(struct net_device *netdev) 2149 { 2150 struct tsnep_adapter *adapter = netdev_priv(netdev); 2151 2152 u16 rx_filter = 0; 2153 2154 /* configured MAC address and broadcasts are never filtered */ 2155 if (netdev->flags & IFF_PROMISC) { 2156 rx_filter |= TSNEP_RX_FILTER_ACCEPT_ALL_MULTICASTS; 2157 rx_filter |= TSNEP_RX_FILTER_ACCEPT_ALL_UNICASTS; 2158 } else if (!netdev_mc_empty(netdev) || (netdev->flags & IFF_ALLMULTI)) { 2159 rx_filter |= TSNEP_RX_FILTER_ACCEPT_ALL_MULTICASTS; 2160 } 2161 iowrite16(rx_filter, adapter->addr + TSNEP_RX_FILTER); 2162 } 2163 2164 static void tsnep_netdev_get_stats64(struct net_device *netdev, 2165 struct rtnl_link_stats64 *stats) 2166 { 2167 struct tsnep_adapter *adapter = netdev_priv(netdev); 2168 u32 reg; 2169 u32 val; 2170 int i; 2171 2172 for (i = 0; i < adapter->num_tx_queues; i++) { 2173 stats->tx_packets += adapter->tx[i].packets; 2174 stats->tx_bytes += adapter->tx[i].bytes; 2175 stats->tx_dropped += adapter->tx[i].dropped; 2176 } 2177 for (i = 0; i < adapter->num_rx_queues; i++) { 2178 stats->rx_packets += adapter->rx[i].packets; 2179 stats->rx_bytes += adapter->rx[i].bytes; 2180 stats->rx_dropped += adapter->rx[i].dropped; 2181 stats->multicast += adapter->rx[i].multicast; 2182 2183 reg = ioread32(adapter->addr + TSNEP_QUEUE(i) + 2184 TSNEP_RX_STATISTIC); 2185 val = (reg & TSNEP_RX_STATISTIC_NO_DESC_MASK) >> 2186 TSNEP_RX_STATISTIC_NO_DESC_SHIFT; 2187 stats->rx_dropped += val; 2188 val = (reg & TSNEP_RX_STATISTIC_BUFFER_TOO_SMALL_MASK) >> 2189 TSNEP_RX_STATISTIC_BUFFER_TOO_SMALL_SHIFT; 2190 stats->rx_dropped += val; 2191 val = (reg & TSNEP_RX_STATISTIC_FIFO_OVERFLOW_MASK) >> 2192 TSNEP_RX_STATISTIC_FIFO_OVERFLOW_SHIFT; 2193 stats->rx_errors += val; 2194 stats->rx_fifo_errors += val; 2195 val = (reg & TSNEP_RX_STATISTIC_INVALID_FRAME_MASK) >> 2196 TSNEP_RX_STATISTIC_INVALID_FRAME_SHIFT; 2197 stats->rx_errors += val; 2198 stats->rx_frame_errors += val; 2199 } 2200 2201 reg = ioread32(adapter->addr + ECM_STAT); 2202 val = (reg & ECM_STAT_RX_ERR_MASK) >> ECM_STAT_RX_ERR_SHIFT; 2203 stats->rx_errors += val; 2204 val = (reg & ECM_STAT_INV_FRM_MASK) >> ECM_STAT_INV_FRM_SHIFT; 2205 stats->rx_errors += val; 2206 stats->rx_crc_errors += val; 2207 val = (reg & ECM_STAT_FWD_RX_ERR_MASK) >> ECM_STAT_FWD_RX_ERR_SHIFT; 2208 stats->rx_errors += val; 2209 } 2210 2211 static void tsnep_mac_set_address(struct tsnep_adapter *adapter, u8 *addr) 2212 { 2213 iowrite32(*(u32 *)addr, adapter->addr + TSNEP_MAC_ADDRESS_LOW); 2214 iowrite16(*(u16 *)(addr + sizeof(u32)), 2215 adapter->addr + TSNEP_MAC_ADDRESS_HIGH); 2216 2217 ether_addr_copy(adapter->mac_address, addr); 2218 netif_info(adapter, drv, adapter->netdev, "MAC address set to %pM\n", 2219 addr); 2220 } 2221 2222 static int tsnep_netdev_set_mac_address(struct net_device *netdev, void *addr) 2223 { 2224 struct tsnep_adapter *adapter = netdev_priv(netdev); 2225 struct sockaddr *sock_addr = addr; 2226 int retval; 2227 2228 retval = eth_prepare_mac_addr_change(netdev, sock_addr); 2229 if (retval) 2230 return retval; 2231 eth_hw_addr_set(netdev, sock_addr->sa_data); 2232 tsnep_mac_set_address(adapter, sock_addr->sa_data); 2233 2234 return 0; 2235 } 2236 2237 static int tsnep_netdev_set_features(struct net_device *netdev, 2238 netdev_features_t features) 2239 { 2240 struct tsnep_adapter *adapter = netdev_priv(netdev); 2241 netdev_features_t changed = netdev->features ^ features; 2242 bool enable; 2243 int retval = 0; 2244 2245 if (changed & NETIF_F_LOOPBACK) { 2246 enable = !!(features & NETIF_F_LOOPBACK); 2247 retval = tsnep_phy_loopback(adapter, enable); 2248 } 2249 2250 return retval; 2251 } 2252 2253 static ktime_t tsnep_netdev_get_tstamp(struct net_device *netdev, 2254 const struct skb_shared_hwtstamps *hwtstamps, 2255 bool cycles) 2256 { 2257 struct tsnep_rx_inline *rx_inline = hwtstamps->netdev_data; 2258 u64 timestamp; 2259 2260 if (cycles) 2261 timestamp = __le64_to_cpu(rx_inline->counter); 2262 else 2263 timestamp = __le64_to_cpu(rx_inline->timestamp); 2264 2265 return ns_to_ktime(timestamp); 2266 } 2267 2268 static int tsnep_netdev_bpf(struct net_device *dev, struct netdev_bpf *bpf) 2269 { 2270 struct tsnep_adapter *adapter = netdev_priv(dev); 2271 2272 switch (bpf->command) { 2273 case XDP_SETUP_PROG: 2274 return tsnep_xdp_setup_prog(adapter, bpf->prog, bpf->extack); 2275 case XDP_SETUP_XSK_POOL: 2276 return tsnep_xdp_setup_pool(adapter, bpf->xsk.pool, 2277 bpf->xsk.queue_id); 2278 default: 2279 return -EOPNOTSUPP; 2280 } 2281 } 2282 2283 static struct tsnep_tx *tsnep_xdp_get_tx(struct tsnep_adapter *adapter, u32 cpu) 2284 { 2285 if (cpu >= TSNEP_MAX_QUEUES) 2286 cpu &= TSNEP_MAX_QUEUES - 1; 2287 2288 while (cpu >= adapter->num_tx_queues) 2289 cpu -= adapter->num_tx_queues; 2290 2291 return &adapter->tx[cpu]; 2292 } 2293 2294 static int tsnep_netdev_xdp_xmit(struct net_device *dev, int n, 2295 struct xdp_frame **xdp, u32 flags) 2296 { 2297 struct tsnep_adapter *adapter = netdev_priv(dev); 2298 u32 cpu = smp_processor_id(); 2299 struct netdev_queue *nq; 2300 struct tsnep_tx *tx; 2301 int nxmit; 2302 bool xmit; 2303 2304 if (unlikely(flags & ~XDP_XMIT_FLAGS_MASK)) 2305 return -EINVAL; 2306 2307 tx = tsnep_xdp_get_tx(adapter, cpu); 2308 nq = netdev_get_tx_queue(adapter->netdev, tx->queue_index); 2309 2310 __netif_tx_lock(nq, cpu); 2311 2312 for (nxmit = 0; nxmit < n; nxmit++) { 2313 xmit = tsnep_xdp_xmit_frame_ring(xdp[nxmit], tx, 2314 TSNEP_TX_TYPE_XDP_NDO); 2315 if (!xmit) 2316 break; 2317 2318 /* avoid transmit queue timeout since we share it with the slow 2319 * path 2320 */ 2321 txq_trans_cond_update(nq); 2322 } 2323 2324 if (flags & XDP_XMIT_FLUSH) 2325 tsnep_xdp_xmit_flush(tx); 2326 2327 __netif_tx_unlock(nq); 2328 2329 return nxmit; 2330 } 2331 2332 static int tsnep_netdev_xsk_wakeup(struct net_device *dev, u32 queue_id, 2333 u32 flags) 2334 { 2335 struct tsnep_adapter *adapter = netdev_priv(dev); 2336 struct tsnep_queue *queue; 2337 2338 if (queue_id >= adapter->num_rx_queues || 2339 queue_id >= adapter->num_tx_queues) 2340 return -EINVAL; 2341 2342 queue = &adapter->queue[queue_id]; 2343 2344 if (!napi_if_scheduled_mark_missed(&queue->napi)) 2345 napi_schedule(&queue->napi); 2346 2347 return 0; 2348 } 2349 2350 static const struct net_device_ops tsnep_netdev_ops = { 2351 .ndo_open = tsnep_netdev_open, 2352 .ndo_stop = tsnep_netdev_close, 2353 .ndo_start_xmit = tsnep_netdev_xmit_frame, 2354 .ndo_eth_ioctl = tsnep_netdev_ioctl, 2355 .ndo_set_rx_mode = tsnep_netdev_set_multicast, 2356 .ndo_get_stats64 = tsnep_netdev_get_stats64, 2357 .ndo_set_mac_address = tsnep_netdev_set_mac_address, 2358 .ndo_set_features = tsnep_netdev_set_features, 2359 .ndo_get_tstamp = tsnep_netdev_get_tstamp, 2360 .ndo_setup_tc = tsnep_tc_setup, 2361 .ndo_bpf = tsnep_netdev_bpf, 2362 .ndo_xdp_xmit = tsnep_netdev_xdp_xmit, 2363 .ndo_xsk_wakeup = tsnep_netdev_xsk_wakeup, 2364 }; 2365 2366 static int tsnep_mac_init(struct tsnep_adapter *adapter) 2367 { 2368 int retval; 2369 2370 /* initialize RX filtering, at least configured MAC address and 2371 * broadcast are not filtered 2372 */ 2373 iowrite16(0, adapter->addr + TSNEP_RX_FILTER); 2374 2375 /* try to get MAC address in the following order: 2376 * - device tree 2377 * - valid MAC address already set 2378 * - MAC address register if valid 2379 * - random MAC address 2380 */ 2381 retval = of_get_mac_address(adapter->pdev->dev.of_node, 2382 adapter->mac_address); 2383 if (retval == -EPROBE_DEFER) 2384 return retval; 2385 if (retval && !is_valid_ether_addr(adapter->mac_address)) { 2386 *(u32 *)adapter->mac_address = 2387 ioread32(adapter->addr + TSNEP_MAC_ADDRESS_LOW); 2388 *(u16 *)(adapter->mac_address + sizeof(u32)) = 2389 ioread16(adapter->addr + TSNEP_MAC_ADDRESS_HIGH); 2390 if (!is_valid_ether_addr(adapter->mac_address)) 2391 eth_random_addr(adapter->mac_address); 2392 } 2393 2394 tsnep_mac_set_address(adapter, adapter->mac_address); 2395 eth_hw_addr_set(adapter->netdev, adapter->mac_address); 2396 2397 return 0; 2398 } 2399 2400 static int tsnep_mdio_init(struct tsnep_adapter *adapter) 2401 { 2402 struct device_node *np = adapter->pdev->dev.of_node; 2403 int retval; 2404 2405 if (np) { 2406 np = of_get_child_by_name(np, "mdio"); 2407 if (!np) 2408 return 0; 2409 2410 adapter->suppress_preamble = 2411 of_property_read_bool(np, "suppress-preamble"); 2412 } 2413 2414 adapter->mdiobus = devm_mdiobus_alloc(&adapter->pdev->dev); 2415 if (!adapter->mdiobus) { 2416 retval = -ENOMEM; 2417 2418 goto out; 2419 } 2420 2421 adapter->mdiobus->priv = (void *)adapter; 2422 adapter->mdiobus->parent = &adapter->pdev->dev; 2423 adapter->mdiobus->read = tsnep_mdiobus_read; 2424 adapter->mdiobus->write = tsnep_mdiobus_write; 2425 adapter->mdiobus->name = TSNEP "-mdiobus"; 2426 snprintf(adapter->mdiobus->id, MII_BUS_ID_SIZE, "%s", 2427 adapter->pdev->name); 2428 2429 /* do not scan broadcast address */ 2430 adapter->mdiobus->phy_mask = 0x0000001; 2431 2432 retval = of_mdiobus_register(adapter->mdiobus, np); 2433 2434 out: 2435 of_node_put(np); 2436 2437 return retval; 2438 } 2439 2440 static int tsnep_phy_init(struct tsnep_adapter *adapter) 2441 { 2442 struct device_node *phy_node; 2443 int retval; 2444 2445 retval = of_get_phy_mode(adapter->pdev->dev.of_node, 2446 &adapter->phy_mode); 2447 if (retval) 2448 adapter->phy_mode = PHY_INTERFACE_MODE_GMII; 2449 2450 phy_node = of_parse_phandle(adapter->pdev->dev.of_node, "phy-handle", 2451 0); 2452 adapter->phydev = of_phy_find_device(phy_node); 2453 of_node_put(phy_node); 2454 if (!adapter->phydev && adapter->mdiobus) 2455 adapter->phydev = phy_find_first(adapter->mdiobus); 2456 if (!adapter->phydev) 2457 return -EIO; 2458 2459 return 0; 2460 } 2461 2462 static int tsnep_queue_init(struct tsnep_adapter *adapter, int queue_count) 2463 { 2464 u32 irq_mask = ECM_INT_TX_0 | ECM_INT_RX_0; 2465 char name[8]; 2466 int i; 2467 int retval; 2468 2469 /* one TX/RX queue pair for netdev is mandatory */ 2470 if (platform_irq_count(adapter->pdev) == 1) 2471 retval = platform_get_irq(adapter->pdev, 0); 2472 else 2473 retval = platform_get_irq_byname(adapter->pdev, "mac"); 2474 if (retval < 0) 2475 return retval; 2476 adapter->num_tx_queues = 1; 2477 adapter->num_rx_queues = 1; 2478 adapter->num_queues = 1; 2479 adapter->queue[0].adapter = adapter; 2480 adapter->queue[0].irq = retval; 2481 adapter->queue[0].tx = &adapter->tx[0]; 2482 adapter->queue[0].tx->adapter = adapter; 2483 adapter->queue[0].tx->addr = adapter->addr + TSNEP_QUEUE(0); 2484 adapter->queue[0].tx->queue_index = 0; 2485 adapter->queue[0].rx = &adapter->rx[0]; 2486 adapter->queue[0].rx->adapter = adapter; 2487 adapter->queue[0].rx->addr = adapter->addr + TSNEP_QUEUE(0); 2488 adapter->queue[0].rx->queue_index = 0; 2489 adapter->queue[0].irq_mask = irq_mask; 2490 adapter->queue[0].irq_delay_addr = adapter->addr + ECM_INT_DELAY; 2491 retval = tsnep_set_irq_coalesce(&adapter->queue[0], 2492 TSNEP_COALESCE_USECS_DEFAULT); 2493 if (retval < 0) 2494 return retval; 2495 2496 adapter->netdev->irq = adapter->queue[0].irq; 2497 2498 /* add additional TX/RX queue pairs only if dedicated interrupt is 2499 * available 2500 */ 2501 for (i = 1; i < queue_count; i++) { 2502 sprintf(name, "txrx-%d", i); 2503 retval = platform_get_irq_byname_optional(adapter->pdev, name); 2504 if (retval < 0) 2505 break; 2506 2507 adapter->num_tx_queues++; 2508 adapter->num_rx_queues++; 2509 adapter->num_queues++; 2510 adapter->queue[i].adapter = adapter; 2511 adapter->queue[i].irq = retval; 2512 adapter->queue[i].tx = &adapter->tx[i]; 2513 adapter->queue[i].tx->adapter = adapter; 2514 adapter->queue[i].tx->addr = adapter->addr + TSNEP_QUEUE(i); 2515 adapter->queue[i].tx->queue_index = i; 2516 adapter->queue[i].rx = &adapter->rx[i]; 2517 adapter->queue[i].rx->adapter = adapter; 2518 adapter->queue[i].rx->addr = adapter->addr + TSNEP_QUEUE(i); 2519 adapter->queue[i].rx->queue_index = i; 2520 adapter->queue[i].irq_mask = 2521 irq_mask << (ECM_INT_TXRX_SHIFT * i); 2522 adapter->queue[i].irq_delay_addr = 2523 adapter->addr + ECM_INT_DELAY + ECM_INT_DELAY_OFFSET * i; 2524 retval = tsnep_set_irq_coalesce(&adapter->queue[i], 2525 TSNEP_COALESCE_USECS_DEFAULT); 2526 if (retval < 0) 2527 return retval; 2528 } 2529 2530 return 0; 2531 } 2532 2533 static int tsnep_probe(struct platform_device *pdev) 2534 { 2535 struct tsnep_adapter *adapter; 2536 struct net_device *netdev; 2537 struct resource *io; 2538 u32 type; 2539 int revision; 2540 int version; 2541 int queue_count; 2542 int retval; 2543 2544 netdev = devm_alloc_etherdev_mqs(&pdev->dev, 2545 sizeof(struct tsnep_adapter), 2546 TSNEP_MAX_QUEUES, TSNEP_MAX_QUEUES); 2547 if (!netdev) 2548 return -ENODEV; 2549 SET_NETDEV_DEV(netdev, &pdev->dev); 2550 adapter = netdev_priv(netdev); 2551 platform_set_drvdata(pdev, adapter); 2552 adapter->pdev = pdev; 2553 adapter->dmadev = &pdev->dev; 2554 adapter->netdev = netdev; 2555 adapter->msg_enable = NETIF_MSG_DRV | NETIF_MSG_PROBE | 2556 NETIF_MSG_LINK | NETIF_MSG_IFUP | 2557 NETIF_MSG_IFDOWN | NETIF_MSG_TX_QUEUED; 2558 2559 netdev->min_mtu = ETH_MIN_MTU; 2560 netdev->max_mtu = TSNEP_MAX_FRAME_SIZE; 2561 2562 mutex_init(&adapter->gate_control_lock); 2563 mutex_init(&adapter->rxnfc_lock); 2564 INIT_LIST_HEAD(&adapter->rxnfc_rules); 2565 2566 adapter->addr = devm_platform_get_and_ioremap_resource(pdev, 0, &io); 2567 if (IS_ERR(adapter->addr)) 2568 return PTR_ERR(adapter->addr); 2569 netdev->mem_start = io->start; 2570 netdev->mem_end = io->end; 2571 2572 type = ioread32(adapter->addr + ECM_TYPE); 2573 revision = (type & ECM_REVISION_MASK) >> ECM_REVISION_SHIFT; 2574 version = (type & ECM_VERSION_MASK) >> ECM_VERSION_SHIFT; 2575 queue_count = (type & ECM_QUEUE_COUNT_MASK) >> ECM_QUEUE_COUNT_SHIFT; 2576 adapter->gate_control = type & ECM_GATE_CONTROL; 2577 adapter->rxnfc_max = TSNEP_RX_ASSIGN_ETHER_TYPE_COUNT; 2578 2579 tsnep_disable_irq(adapter, ECM_INT_ALL); 2580 2581 retval = tsnep_queue_init(adapter, queue_count); 2582 if (retval) 2583 return retval; 2584 2585 retval = dma_set_mask_and_coherent(&adapter->pdev->dev, 2586 DMA_BIT_MASK(64)); 2587 if (retval) { 2588 dev_err(&adapter->pdev->dev, "no usable DMA configuration.\n"); 2589 return retval; 2590 } 2591 2592 retval = tsnep_mac_init(adapter); 2593 if (retval) 2594 return retval; 2595 2596 retval = tsnep_mdio_init(adapter); 2597 if (retval) 2598 goto mdio_init_failed; 2599 2600 retval = tsnep_phy_init(adapter); 2601 if (retval) 2602 goto phy_init_failed; 2603 2604 retval = tsnep_ptp_init(adapter); 2605 if (retval) 2606 goto ptp_init_failed; 2607 2608 retval = tsnep_tc_init(adapter); 2609 if (retval) 2610 goto tc_init_failed; 2611 2612 retval = tsnep_rxnfc_init(adapter); 2613 if (retval) 2614 goto rxnfc_init_failed; 2615 2616 netdev->netdev_ops = &tsnep_netdev_ops; 2617 netdev->ethtool_ops = &tsnep_ethtool_ops; 2618 netdev->features = NETIF_F_SG; 2619 netdev->hw_features = netdev->features | NETIF_F_LOOPBACK; 2620 2621 netdev->xdp_features = NETDEV_XDP_ACT_BASIC | NETDEV_XDP_ACT_REDIRECT | 2622 NETDEV_XDP_ACT_NDO_XMIT | 2623 NETDEV_XDP_ACT_NDO_XMIT_SG | 2624 NETDEV_XDP_ACT_XSK_ZEROCOPY; 2625 2626 /* carrier off reporting is important to ethtool even BEFORE open */ 2627 netif_carrier_off(netdev); 2628 2629 retval = register_netdev(netdev); 2630 if (retval) 2631 goto register_failed; 2632 2633 dev_info(&adapter->pdev->dev, "device version %d.%02d\n", version, 2634 revision); 2635 if (adapter->gate_control) 2636 dev_info(&adapter->pdev->dev, "gate control detected\n"); 2637 2638 return 0; 2639 2640 register_failed: 2641 tsnep_rxnfc_cleanup(adapter); 2642 rxnfc_init_failed: 2643 tsnep_tc_cleanup(adapter); 2644 tc_init_failed: 2645 tsnep_ptp_cleanup(adapter); 2646 ptp_init_failed: 2647 phy_init_failed: 2648 if (adapter->mdiobus) 2649 mdiobus_unregister(adapter->mdiobus); 2650 mdio_init_failed: 2651 return retval; 2652 } 2653 2654 static void tsnep_remove(struct platform_device *pdev) 2655 { 2656 struct tsnep_adapter *adapter = platform_get_drvdata(pdev); 2657 2658 unregister_netdev(adapter->netdev); 2659 2660 tsnep_rxnfc_cleanup(adapter); 2661 2662 tsnep_tc_cleanup(adapter); 2663 2664 tsnep_ptp_cleanup(adapter); 2665 2666 if (adapter->mdiobus) 2667 mdiobus_unregister(adapter->mdiobus); 2668 2669 tsnep_disable_irq(adapter, ECM_INT_ALL); 2670 } 2671 2672 static const struct of_device_id tsnep_of_match[] = { 2673 { .compatible = "engleder,tsnep", }, 2674 { }, 2675 }; 2676 MODULE_DEVICE_TABLE(of, tsnep_of_match); 2677 2678 static struct platform_driver tsnep_driver = { 2679 .driver = { 2680 .name = TSNEP, 2681 .of_match_table = tsnep_of_match, 2682 }, 2683 .probe = tsnep_probe, 2684 .remove_new = tsnep_remove, 2685 }; 2686 module_platform_driver(tsnep_driver); 2687 2688 MODULE_AUTHOR("Gerhard Engleder <gerhard@engleder-embedded.com>"); 2689 MODULE_DESCRIPTION("TSN endpoint Ethernet MAC driver"); 2690 MODULE_LICENSE("GPL"); 2691