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tsnep_main.c
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linux-6.19.14/drivers/net/ethernet/engleder/tsnep_main.c
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#define TSNEP_TX_TYPE_TSTAMP BIT(13) 71#define TSNEP_TX_TYPE_SKB_TSTAMP (TSNEP_TX_TYPE_SKB | TSNEP_TX_TYPE_TSTAMP) 72 73#define TSNEP_XDP_TX BIT(0) 74#define TSNEP_XDP_REDIRECT BIT(1) 75 76static void tsnep_enable_irq(struct tsnep_adapter *adapter, u32 mask) 77{ 78 iowrite32(mask, adapter->addr + ECM_INT_ENABLE); 79} 80 81static void tsnep_disable_irq(struct tsnep_adapter *adapter, u32 mask) 82{ 83 mask |= ECM_INT_DISABLE; 84 iowrite32(mask, adapter->addr + ECM_INT_ENABLE); 85} 86 87static irqreturn_t tsnep_irq(int irq, void *arg) 88{ 89 struct tsnep_adapter *adapter = arg; 90 u32 active = ioread32(adapter->addr + ECM_INT_ACTIVE); 91 92 /* acknowledge interrupt */ 93 if (active != 0) 94 iowrite32(active, adapter->addr + ECM_INT_ACKNOWLEDGE); 95 96 /* handle link interrupt */ 97 if ((active & ECM_INT_LINK) != 0) 98 phy_mac_interrupt(adapter->netdev->phydev); 99 100 /* handle TX/RX queue 0 interrupt */ 101 if ((active & adapter->queue[0].irq_mask) != 0) { 102 if (napi_schedule_prep(&adapter->queue[0].napi)) { 103 tsnep_disable_irq(adapter, adapter->queue[0].irq_mask); 104 /* schedule after masking to avoid races */ 105 __napi_schedule(&adapter->queue[0].napi); 106 } 107 } 108 109 return IRQ_HANDLED; 110} 111 112static irqreturn_t tsnep_irq_txrx(int irq, void *arg) 113{ 114 struct tsnep_queue *queue = arg; 115 116 /* handle TX/RX queue interrupt */ 117 if (napi_schedule_prep(&queue->napi)) { 118 tsnep_disable_irq(queue->adapter, queue->irq_mask); 119 /* schedule after masking to avoid races */ 120 __napi_schedule(&queue->napi); 121 } 122 123 return IRQ_HANDLED; 124} 125 126int tsnep_set_irq_coalesce(struct tsnep_queue *queue, u32 usecs) 127{ 128 if (usecs > TSNEP_COALESCE_USECS_MAX) 129 return -ERANGE; 130 131 usecs /= ECM_INT_DELAY_BASE_US; 132 usecs <<= ECM_INT_DELAY_SHIFT; 133 usecs &= ECM_INT_DELAY_MASK; 134 135 queue->irq_delay &= ~ECM_INT_DELAY_MASK; 136 queue->irq_delay |= usecs; 137 iowrite8(queue->irq_delay, queue->irq_delay_addr); 138 139 return 0; 140} 141 142u32 tsnep_get_irq_coalesce(struct tsnep_queue *queue) 143{ 144 u32 usecs; 145 146 usecs = (queue->irq_delay & ECM_INT_DELAY_MASK); 147 usecs >>= ECM_INT_DELAY_SHIFT; 148 usecs *= ECM_INT_DELAY_BASE_US; 149 150 return usecs; 151} 152 153static int tsnep_mdiobus_read(struct mii_bus *bus, int addr, int regnum) 154{ 155 struct tsnep_adapter *adapter = bus->priv; 156 u32 md; 157 int retval; 158 159 md = ECM_MD_READ; 160 if (!adapter->suppress_preamble) 161 md |= ECM_MD_PREAMBLE; 162 md |= (regnum << ECM_MD_ADDR_SHIFT) & ECM_MD_ADDR_MASK; 163 md |= (addr << ECM_MD_PHY_ADDR_SHIFT) & ECM_MD_PHY_ADDR_MASK; 164 iowrite32(md, adapter->addr + ECM_MD_CONTROL); 165 retval = readl_poll_timeout_atomic(adapter->addr + ECM_MD_STATUS, md, 166 !(md & ECM_MD_BUSY), 16, 1000); 167 if (retval != 0) 168 return retval; 169 170 return (md & ECM_MD_DATA_MASK) >> ECM_MD_DATA_SHIFT; 171} 172 173static int tsnep_mdiobus_write(struct mii_bus *bus, int addr, int regnum, 174 u16 val) 175{ 176 struct tsnep_adapter *adapter = bus->priv; 177 u32 md; 178 int retval; 179 180 md = ECM_MD_WRITE; 181 if (!adapter->suppress_preamble) 182 md |= ECM_MD_PREAMBLE; 183 md |= (regnum << ECM_MD_ADDR_SHIFT) & ECM_MD_ADDR_MASK; 184 md |= (addr << ECM_MD_PHY_ADDR_SHIFT) & ECM_MD_PHY_ADDR_MASK; 185 md |= ((u32)val << ECM_MD_DATA_SHIFT) & ECM_MD_DATA_MASK; 186 iowrite32(md, adapter->addr + ECM_MD_CONTROL); 187 retval = readl_poll_timeout_atomic(adapter->addr + ECM_MD_STATUS, md, 188 !(md & ECM_MD_BUSY), 16, 1000); 189 if (retval != 0) 190 return retval; 191 192 return 0; 193} 194 195static void tsnep_set_link_mode(struct tsnep_adapter *adapter) 196{ 197 u32 mode; 198 199 switch (adapter->phydev->speed) { 200 case SPEED_100: 201 mode = ECM_LINK_MODE_100; 202 break; 203 case SPEED_1000: 204 mode = ECM_LINK_MODE_1000; 205 break; 206 default: 207 mode = ECM_LINK_MODE_OFF; 208 break; 209 } 210 iowrite32(mode, adapter->addr + ECM_STATUS); 211} 212 213static void tsnep_phy_link_status_change(struct net_device *netdev) 214{ 215 struct tsnep_adapter *adapter = netdev_priv(netdev); 216 struct phy_device *phydev = netdev->phydev; 217 218 if (phydev->link) 219 tsnep_set_link_mode(adapter); 220 221 phy_print_status(netdev->phydev); 222} 223 224static int tsnep_phy_loopback(struct tsnep_adapter *adapter, bool enable) 225{ 226 int speed; 227 228 if (enable) { 229 if (adapter->phydev->autoneg == AUTONEG_DISABLE && 230 adapter->phydev->speed == SPEED_100) 231 speed = SPEED_100; 232 else 233 speed = SPEED_1000; 234 } else { 235 speed = 0; 236 } 237 238 return phy_loopback(adapter->phydev, enable, speed); 239} 240 241static int tsnep_phy_open(struct tsnep_adapter *adapter) 242{ 243 struct phy_device *phydev; 244 struct ethtool_keee ethtool_keee; 245 int retval; 246 247 retval = phy_connect_direct(adapter->netdev, adapter->phydev, 248 tsnep_phy_link_status_change, 249 adapter->phy_mode); 250 if (retval) 251 return retval; 252 phydev = adapter->netdev->phydev; 253 254 /* MAC supports only 100Mbps|1000Mbps full duplex 255 * SPE (Single Pair Ethernet) is also an option but not implemented yet 256 */ 257 phy_remove_link_mode(phydev, ETHTOOL_LINK_MODE_10baseT_Half_BIT); 258 phy_remove_link_mode(phydev, ETHTOOL_LINK_MODE_10baseT_Full_BIT); 259 phy_remove_link_mode(phydev, ETHTOOL_LINK_MODE_100baseT_Half_BIT); 260 phy_remove_link_mode(phydev, ETHTOOL_LINK_MODE_1000baseT_Half_BIT); 261 262 /* disable EEE autoneg, EEE not supported by TSNEP */ 263 memset(ðtool_keee, 0, sizeof(ethtool_keee)); 264 phy_ethtool_set_eee(adapter->phydev, ðtool_keee); 265 266 adapter->phydev->irq = PHY_MAC_INTERRUPT; 267 phy_start(adapter->phydev); 268 269 return 0; 270} 271 272static void tsnep_phy_close(struct tsnep_adapter *adapter) 273{ 274 phy_stop(adapter->netdev->phydev); 275 phy_disconnect(adapter->netdev->phydev); 276} 277 278static void tsnep_tx_ring_cleanup(struct tsnep_tx *tx) 279{ 280 struct device *dmadev = tx->adapter->dmadev; 281 int i; 282 283 memset(tx->entry, 0, sizeof(tx->entry)); 284 285 for (i = 0; i < TSNEP_RING_PAGE_COUNT; i++) { 286 if (tx->page[i]) { 287 dma_free_coherent(dmadev, PAGE_SIZE, tx->page[i], 288 tx->page_dma[i]); 289 tx->page[i] = NULL; 290 tx->page_dma[i] = 0; 291 } 292 } 293} 294 295static int tsnep_tx_ring_create(struct tsnep_tx *tx) 296{ 297 struct device *dmadev = tx->adapter->dmadev; 298 struct tsnep_tx_entry *entry; 299 struct tsnep_tx_entry *next_entry; 300 int i, j; 301 int retval; 302 303 for (i = 0; i < TSNEP_RING_PAGE_COUNT; i++) { 304 tx->page[i] = 305 dma_alloc_coherent(dmadev, PAGE_SIZE, &tx->page_dma[i], 306 GFP_KERNEL); 307 if (!tx->page[i]) { 308 retval = -ENOMEM; 309 goto alloc_failed; 310 } 311 for (j = 0; j < TSNEP_RING_ENTRIES_PER_PAGE; j++) { 312 entry = &tx->entry[TSNEP_RING_ENTRIES_PER_PAGE * i + j]; 313 entry->desc_wb = (struct tsnep_tx_desc_wb *) 314 (((u8 *)tx->page[i]) + TSNEP_DESC_SIZE * j); 315 entry->desc = (struct tsnep_tx_desc *) 316 (((u8 *)entry->desc_wb) + TSNEP_DESC_OFFSET); 317 entry->desc_dma = tx->page_dma[i] + TSNEP_DESC_SIZE * j; 318 entry->owner_user_flag = false; 319 } 320 } 321 for (i = 0; i < TSNEP_RING_SIZE; i++) { 322 entry = &tx->entry[i]; 323 next_entry = &tx->entry[(i + 1) & TSNEP_RING_MASK]; 324 entry->desc->next = __cpu_to_le64(next_entry->desc_dma); 325 } 326 327 return 0; 328 329alloc_failed: 330 tsnep_tx_ring_cleanup(tx); 331 return retval; 332} 333 334static void tsnep_tx_init(struct tsnep_tx *tx) 335{ 336 dma_addr_t dma; 337 338 dma = tx->entry[0].desc_dma | TSNEP_RESET_OWNER_COUNTER; 339 iowrite32(DMA_ADDR_LOW(dma), tx->addr + TSNEP_TX_DESC_ADDR_LOW); 340 iowrite32(DMA_ADDR_HIGH(dma), tx->addr + TSNEP_TX_DESC_ADDR_HIGH); 341 tx->write = 0; 342 tx->read = 0; 343 tx->owner_counter = 1; 344 tx->increment_owner_counter = TSNEP_RING_SIZE - 1; 345} 346 347static void tsnep_tx_enable(struct tsnep_tx *tx) 348{ 349 struct netdev_queue *nq; 350 351 nq = netdev_get_tx_queue(tx->adapter->netdev, tx->queue_index); 352 353 __netif_tx_lock_bh(nq); 354 netif_tx_wake_queue(nq); 355 __netif_tx_unlock_bh(nq); 356} 357 358static void tsnep_tx_disable(struct tsnep_tx *tx, struct napi_struct *napi) 359{ 360 struct netdev_queue *nq; 361 u32 val; 362 363 nq = netdev_get_tx_queue(tx->adapter->netdev, tx->queue_index); 364 365 __netif_tx_lock_bh(nq); 366 netif_tx_stop_queue(nq); 367 __netif_tx_unlock_bh(nq); 368 369 /* wait until TX is done in hardware */ 370 readx_poll_timeout(ioread32, tx->addr + TSNEP_CONTROL, val, 371 ((val & TSNEP_CONTROL_TX_ENABLE) == 0), 10000, 372 1000000); 373 374 /* wait until TX is also done in software */ 375 while (READ_ONCE(tx->read) != tx->write) { 376 napi_schedule(napi); 377 napi_synchronize(napi); 378 } 379} 380 381static void tsnep_tx_activate(struct tsnep_tx *tx, int index, int length, 382 bool last) 383{ 384 struct tsnep_tx_entry *entry = &tx->entry[index]; 385 386 entry->properties = 0; 387 /* xdpf and zc are union with skb */ 388 if (entry->skb) { 389 entry->properties = length & TSNEP_DESC_LENGTH_MASK; 390 entry->properties |= TSNEP_DESC_INTERRUPT_FLAG; 391 if ((entry->type & TSNEP_TX_TYPE_SKB_TSTAMP) == TSNEP_TX_TYPE_SKB_TSTAMP) 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 442static 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 450static 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 483static int tsnep_tx_map(struct sk_buff *skb, struct tsnep_tx *tx, int count, 484 bool do_tstamp) 485{ 486 struct device *dmadev = tx->adapter->dmadev; 487 struct tsnep_tx_entry *entry; 488 unsigned int len; 489 int map_len = 0; 490 dma_addr_t dma; 491 int i, mapped; 492 493 for (i = 0; i < count; i++) { 494 entry = &tx->entry[(tx->write + i) & TSNEP_RING_MASK]; 495 496 if (!i) { 497 len = skb_headlen(skb); 498 if (likely(len > TSNEP_DESC_SIZE_DATA_AFTER_INLINE)) { 499 dma = dma_map_single(dmadev, skb->data, len, 500 DMA_TO_DEVICE); 501 if (dma_mapping_error(dmadev, dma)) 502 return -ENOMEM; 503 entry->type = TSNEP_TX_TYPE_SKB_MAP; 504 mapped = 1; 505 } else { 506 memcpy(&entry->desc->tx, skb->data, len); 507 entry->type = TSNEP_TX_TYPE_SKB_INLINE; 508 mapped = 0; 509 } 510 511 if (do_tstamp) 512 entry->type |= TSNEP_TX_TYPE_TSTAMP; 513 } else { 514 skb_frag_t *frag = &skb_shinfo(skb)->frags[i - 1]; 515 516 len = skb_frag_size(frag); 517 mapped = tsnep_tx_map_frag(frag, entry, dmadev, &dma); 518 if (mapped < 0) 519 return mapped; 520 } 521 522 entry->len = len; 523 if (likely(mapped)) { 524 dma_unmap_addr_set(entry, dma, dma); 525 entry->desc->tx = __cpu_to_le64(dma); 526 } 527 528 map_len += len; 529 } 530 531 return map_len; 532} 533 534static int tsnep_tx_unmap(struct tsnep_tx *tx, int index, int count) 535{ 536 struct device *dmadev = tx->adapter->dmadev; 537 struct tsnep_tx_entry *entry; 538 int map_len = 0; 539 int i; 540 541 for (i = 0; i < count; i++) { 542 entry = &tx->entry[(index + i) & TSNEP_RING_MASK]; 543 544 if (entry->len) { 545 if (entry->type & TSNEP_TX_TYPE_MAP) 546 dma_unmap_single(dmadev, 547 dma_unmap_addr(entry, dma), 548 dma_unmap_len(entry, len), 549 DMA_TO_DEVICE); 550 else if (entry->type & TSNEP_TX_TYPE_MAP_PAGE) 551 dma_unmap_page(dmadev, 552 dma_unmap_addr(entry, dma), 553 dma_unmap_len(entry, len), 554 DMA_TO_DEVICE); 555 map_len += entry->len; 556 entry->len = 0; 557 } 558 } 559 560 return map_len; 561} 562 563static netdev_tx_t tsnep_xmit_frame_ring(struct sk_buff *skb, 564 struct tsnep_tx *tx) 565{ 566 struct tsnep_tx_entry *entry; 567 bool do_tstamp = false; 568 int count = 1; 569 int length; 570 int retval; 571 int i; 572 573 if (skb_shinfo(skb)->nr_frags > 0) 574 count += skb_shinfo(skb)->nr_frags; 575 576 if (tsnep_tx_desc_available(tx) < count) { 577 /* ring full, shall not happen because queue is stopped if full 578 * below 579 */ 580 netif_stop_subqueue(tx->adapter->netdev, tx->queue_index); 581 582 return NETDEV_TX_BUSY; 583 } 584 585 entry = &tx->entry[tx->write]; 586 entry->skb = skb; 587 588 if (unlikely(skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP) && 589 tx->adapter->hwtstamp_config.tx_type == HWTSTAMP_TX_ON) { 590 skb_shinfo(skb)->tx_flags |= SKBTX_IN_PROGRESS; 591 do_tstamp = true; 592 } 593 594 retval = tsnep_tx_map(skb, tx, count, do_tstamp); 595 if (retval < 0) { 596 tsnep_tx_unmap(tx, tx->write, count); 597 dev_kfree_skb_any(entry->skb); 598 entry->skb = NULL; 599 600 tx->dropped++; 601 602 return NETDEV_TX_OK; 603 } 604 length = retval; 605 606 for (i = 0; i < count; i++) 607 tsnep_tx_activate(tx, (tx->write + i) & TSNEP_RING_MASK, length, 608 i == count - 1); 609 tx->write = (tx->write + count) & TSNEP_RING_MASK; 610 611 skb_tx_timestamp(skb); 612 613 /* descriptor properties shall be valid before hardware is notified */ 614 dma_wmb(); 615 616 iowrite32(TSNEP_CONTROL_TX_ENABLE, tx->addr + TSNEP_CONTROL); 617 618 if (tsnep_tx_desc_available(tx) < (MAX_SKB_FRAGS + 1)) { 619 /* ring can get full with next frame */ 620 netif_stop_subqueue(tx->adapter->netdev, tx->queue_index); 621 } 622 623 return NETDEV_TX_OK; 624} 625 626static int tsnep_xdp_tx_map(struct xdp_frame *xdpf, struct tsnep_tx *tx, 627 struct skb_shared_info *shinfo, int count, u32 type) 628{ 629 struct device *dmadev = tx->adapter->dmadev; 630 struct tsnep_tx_entry *entry; 631 struct page *page; 632 skb_frag_t *frag; 633 unsigned int len; 634 int map_len = 0; 635 dma_addr_t dma; 636 void *data; 637 int i; 638 639 frag = NULL; 640 len = xdpf->len; 641 for (i = 0; i < count; i++) { 642 entry = &tx->entry[(tx->write + i) & TSNEP_RING_MASK]; 643 if (type & TSNEP_TX_TYPE_XDP_NDO) { 644 data = unlikely(frag) ? skb_frag_address(frag) : 645 xdpf->data; 646 dma = dma_map_single(dmadev, data, len, DMA_TO_DEVICE); 647 if (dma_mapping_error(dmadev, dma)) 648 return -ENOMEM; 649 650 entry->type = TSNEP_TX_TYPE_XDP_NDO_MAP_PAGE; 651 } else { 652 page = unlikely(frag) ? skb_frag_page(frag) : 653 virt_to_page(xdpf->data); 654 dma = page_pool_get_dma_addr(page); 655 if (unlikely(frag)) 656 dma += skb_frag_off(frag); 657 else 658 dma += sizeof(*xdpf) + xdpf->headroom; 659 dma_sync_single_for_device(dmadev, dma, len, 660 DMA_BIDIRECTIONAL); 661 662 entry->type = TSNEP_TX_TYPE_XDP_TX; 663 } 664 665 entry->len = len; 666 dma_unmap_addr_set(entry, dma, dma); 667 668 entry->desc->tx = __cpu_to_le64(dma); 669 670 map_len += len; 671 672 if (i + 1 < count) { 673 frag = &shinfo->frags[i]; 674 len = skb_frag_size(frag); 675 } 676 } 677 678 return map_len; 679} 680 681/* This function requires __netif_tx_lock is held by the caller. */ 682static bool tsnep_xdp_xmit_frame_ring(struct xdp_frame *xdpf, 683 struct tsnep_tx *tx, u32 type) 684{ 685 struct skb_shared_info *shinfo = xdp_get_shared_info_from_frame(xdpf); 686 struct tsnep_tx_entry *entry; 687 int count, length, retval, i; 688 689 count = 1; 690 if (unlikely(xdp_frame_has_frags(xdpf))) 691 count += shinfo->nr_frags; 692 693 /* ensure that TX ring is not filled up by XDP, always MAX_SKB_FRAGS 694 * will be available for normal TX path and queue is stopped there if 695 * necessary 696 */ 697 if (tsnep_tx_desc_available(tx) < (MAX_SKB_FRAGS + 1 + count)) 698 return false; 699 700 entry = &tx->entry[tx->write]; 701 entry->xdpf = xdpf; 702 703 retval = tsnep_xdp_tx_map(xdpf, tx, shinfo, count, type); 704 if (retval < 0) { 705 tsnep_tx_unmap(tx, tx->write, count); 706 entry->xdpf = NULL; 707 708 tx->dropped++; 709 710 return false; 711 } 712 length = retval; 713 714 for (i = 0; i < count; i++) 715 tsnep_tx_activate(tx, (tx->write + i) & TSNEP_RING_MASK, length, 716 i == count - 1); 717 tx->write = (tx->write + count) & TSNEP_RING_MASK; 718 719 /* descriptor properties shall be valid before hardware is notified */ 720 dma_wmb(); 721 722 return true; 723} 724 725static void tsnep_xdp_xmit_flush(struct tsnep_tx *tx) 726{ 727 iowrite32(TSNEP_CONTROL_TX_ENABLE, tx->addr + TSNEP_CONTROL); 728} 729 730static bool tsnep_xdp_xmit_back(struct tsnep_adapter *adapter, 731 struct xdp_buff *xdp, 732 struct netdev_queue *tx_nq, struct tsnep_tx *tx, 733 bool zc) 734{ 735 struct xdp_frame *xdpf = xdp_convert_buff_to_frame(xdp); 736 bool xmit; 737 u32 type; 738 739 if (unlikely(!xdpf)) 740 return false; 741 742 /* no page pool for zero copy */ 743 if (zc) 744 type = TSNEP_TX_TYPE_XDP_NDO; 745 else 746 type = TSNEP_TX_TYPE_XDP_TX; 747 748 __netif_tx_lock(tx_nq, smp_processor_id()); 749 750 xmit = tsnep_xdp_xmit_frame_ring(xdpf, tx, type); 751 752 /* Avoid transmit queue timeout since we share it with the slow path */ 753 if (xmit) 754 txq_trans_cond_update(tx_nq); 755 756 __netif_tx_unlock(tx_nq); 757 758 return xmit; 759} 760 761static int tsnep_xdp_tx_map_zc(struct xdp_desc *xdpd, struct tsnep_tx *tx) 762{ 763 struct tsnep_tx_entry *entry; 764 dma_addr_t dma; 765 766 entry = &tx->entry[tx->write]; 767 entry->zc = true; 768 769 dma = xsk_buff_raw_get_dma(tx->xsk_pool, xdpd->addr); 770 xsk_buff_raw_dma_sync_for_device(tx->xsk_pool, dma, xdpd->len); 771 772 entry->type = TSNEP_TX_TYPE_XSK; 773 entry->len = xdpd->len; 774 775 entry->desc->tx = __cpu_to_le64(dma); 776 777 return xdpd->len; 778} 779 780static void tsnep_xdp_xmit_frame_ring_zc(struct xdp_desc *xdpd, 781 struct tsnep_tx *tx) 782{ 783 int length; 784 785 length = tsnep_xdp_tx_map_zc(xdpd, tx); 786 787 tsnep_tx_activate(tx, tx->write, length, true); 788 tx->write = (tx->write + 1) & TSNEP_RING_MASK; 789} 790 791static void tsnep_xdp_xmit_zc(struct tsnep_tx *tx) 792{ 793 int desc_available = tsnep_tx_desc_available(tx); 794 struct xdp_desc *descs = tx->xsk_pool->tx_descs; 795 int batch, i; 796 797 /* ensure that TX ring is not filled up by XDP, always MAX_SKB_FRAGS 798 * will be available for normal TX path and queue is stopped there if 799 * necessary 800 */ 801 if (desc_available <= (MAX_SKB_FRAGS + 1)) 802 return; 803 desc_available -= MAX_SKB_FRAGS + 1; 804 805 batch = xsk_tx_peek_release_desc_batch(tx->xsk_pool, desc_available); 806 for (i = 0; i < batch; i++) 807 tsnep_xdp_xmit_frame_ring_zc(&descs[i], tx); 808 809 if (batch) { 810 /* descriptor properties shall be valid before hardware is 811 * notified 812 */ 813 dma_wmb(); 814 815 tsnep_xdp_xmit_flush(tx); 816 } 817} 818 819static bool tsnep_tx_poll(struct tsnep_tx *tx, int napi_budget) 820{ 821 struct tsnep_tx_entry *entry; 822 struct netdev_queue *nq; 823 int xsk_frames = 0; 824 int budget = 128; 825 int length; 826 int count; 827 828 nq = netdev_get_tx_queue(tx->adapter->netdev, tx->queue_index); 829 __netif_tx_lock(nq, smp_processor_id()); 830 831 do { 832 if (tx->read == tx->write) 833 break; 834 835 entry = &tx->entry[tx->read]; 836 if ((__le32_to_cpu(entry->desc_wb->properties) & 837 TSNEP_TX_DESC_OWNER_MASK) != 838 (entry->properties & TSNEP_TX_DESC_OWNER_MASK)) 839 break; 840 841 /* descriptor properties shall be read first, because valid data 842 * is signaled there 843 */ 844 dma_rmb(); 845 846 count = 1; 847 if ((entry->type & TSNEP_TX_TYPE_SKB) && 848 skb_shinfo(entry->skb)->nr_frags > 0) 849 count += skb_shinfo(entry->skb)->nr_frags; 850 else if ((entry->type & TSNEP_TX_TYPE_XDP) && 851 xdp_frame_has_frags(entry->xdpf)) 852 count += xdp_get_shared_info_from_frame(entry->xdpf)->nr_frags; 853 854 length = tsnep_tx_unmap(tx, tx->read, count); 855 856 if (((entry->type & TSNEP_TX_TYPE_SKB_TSTAMP) == TSNEP_TX_TYPE_SKB_TSTAMP) && 857 (__le32_to_cpu(entry->desc_wb->properties) & 858 TSNEP_DESC_EXTENDED_WRITEBACK_FLAG)) { 859 struct skb_shared_hwtstamps hwtstamps; 860 u64 timestamp; 861 862 if (entry->skb->sk && 863 READ_ONCE(entry->skb->sk->sk_tsflags) & SOF_TIMESTAMPING_BIND_PHC) 864 timestamp = 865 __le64_to_cpu(entry->desc_wb->counter); 866 else 867 timestamp = 868 __le64_to_cpu(entry->desc_wb->timestamp); 869 870 memset(&hwtstamps, 0, sizeof(hwtstamps)); 871 hwtstamps.hwtstamp = ns_to_ktime(timestamp); 872 873 skb_tstamp_tx(entry->skb, &hwtstamps); 874 } 875 876 if (entry->type & TSNEP_TX_TYPE_SKB) 877 napi_consume_skb(entry->skb, napi_budget); 878 else if (entry->type & TSNEP_TX_TYPE_XDP) 879 xdp_return_frame_rx_napi(entry->xdpf); 880 else 881 xsk_frames++; 882 /* xdpf and zc are union with skb */ 883 entry->skb = NULL; 884 885 tx->read = (tx->read + count) & TSNEP_RING_MASK; 886 887 tx->packets++; 888 tx->bytes += length + ETH_FCS_LEN; 889 890 budget--; 891 } while (likely(budget)); 892 893 if (tx->xsk_pool) { 894 if (xsk_frames) 895 xsk_tx_completed(tx->xsk_pool, xsk_frames); 896 if (xsk_uses_need_wakeup(tx->xsk_pool)) 897 xsk_set_tx_need_wakeup(tx->xsk_pool); 898 tsnep_xdp_xmit_zc(tx); 899 } 900 901 if ((tsnep_tx_desc_available(tx) >= ((MAX_SKB_FRAGS + 1) * 2)) && 902 netif_tx_queue_stopped(nq)) { 903 netif_tx_wake_queue(nq); 904 } 905 906 __netif_tx_unlock(nq); 907 908 return budget != 0; 909} 910 911static bool tsnep_tx_pending(struct tsnep_tx *tx) 912{ 913 struct tsnep_tx_entry *entry; 914 struct netdev_queue *nq; 915 bool pending = false; 916 917 nq = netdev_get_tx_queue(tx->adapter->netdev, tx->queue_index); 918 __netif_tx_lock(nq, smp_processor_id()); 919 920 if (tx->read != tx->write) { 921 entry = &tx->entry[tx->read]; 922 if ((__le32_to_cpu(entry->desc_wb->properties) & 923 TSNEP_TX_DESC_OWNER_MASK) == 924 (entry->properties & TSNEP_TX_DESC_OWNER_MASK)) 925 pending = true; 926 } 927 928 __netif_tx_unlock(nq); 929 930 return pending; 931} 932 933static int tsnep_tx_open(struct tsnep_tx *tx) 934{ 935 int retval; 936 937 retval = tsnep_tx_ring_create(tx); 938 if (retval) 939 return retval; 940 941 tsnep_tx_init(tx); 942 943 return 0; 944} 945 946static void tsnep_tx_close(struct tsnep_tx *tx) 947{ 948 tsnep_tx_ring_cleanup(tx); 949} 950 951static void tsnep_rx_ring_cleanup(struct tsnep_rx *rx) 952{ 953 struct device *dmadev = rx->adapter->dmadev; 954 struct tsnep_rx_entry *entry; 955 int i; 956 957 for (i = 0; i < TSNEP_RING_SIZE; i++) { 958 entry = &rx->entry[i]; 959 if (!rx->xsk_pool && entry->page) 960 page_pool_put_full_page(rx->page_pool, entry->page, 961 false); 962 if (rx->xsk_pool && entry->xdp) 963 xsk_buff_free(entry->xdp); 964 /* xdp is union with page */ 965 entry->page = NULL; 966 } 967 968 if (rx->page_pool) 969 page_pool_destroy(rx->page_pool); 970 971 memset(rx->entry, 0, sizeof(rx->entry)); 972 973 for (i = 0; i < TSNEP_RING_PAGE_COUNT; i++) { 974 if (rx->page[i]) { 975 dma_free_coherent(dmadev, PAGE_SIZE, rx->page[i], 976 rx->page_dma[i]); 977 rx->page[i] = NULL; 978 rx->page_dma[i] = 0; 979 } 980 } 981} 982 983static int tsnep_rx_ring_create(struct tsnep_rx *rx) 984{ 985 struct device *dmadev = rx->adapter->dmadev; 986 struct tsnep_rx_entry *entry; 987 struct page_pool_params pp_params = { 0 }; 988 struct tsnep_rx_entry *next_entry; 989 int i, j; 990 int retval; 991 992 for (i = 0; i < TSNEP_RING_PAGE_COUNT; i++) { 993 rx->page[i] = 994 dma_alloc_coherent(dmadev, PAGE_SIZE, &rx->page_dma[i], 995 GFP_KERNEL); 996 if (!rx->page[i]) { 997 retval = -ENOMEM; 998 goto failed; 999 } 1000 for (j = 0; j < TSNEP_RING_ENTRIES_PER_PAGE; j++) { 1001 entry = &rx->entry[TSNEP_RING_ENTRIES_PER_PAGE * i + j]; 1002 entry->desc_wb = (struct tsnep_rx_desc_wb *) 1003 (((u8 *)rx->page[i]) + TSNEP_DESC_SIZE * j); 1004 entry->desc = (struct tsnep_rx_desc *) 1005 (((u8 *)entry->desc_wb) + TSNEP_DESC_OFFSET); 1006 entry->desc_dma = rx->page_dma[i] + TSNEP_DESC_SIZE * j; 1007 } 1008 } 1009 1010 pp_params.flags = PP_FLAG_DMA_MAP | PP_FLAG_DMA_SYNC_DEV; 1011 pp_params.order = 0; 1012 pp_params.pool_size = TSNEP_RING_SIZE; 1013 pp_params.nid = dev_to_node(dmadev); 1014 pp_params.dev = dmadev; 1015 pp_params.dma_dir = DMA_BIDIRECTIONAL; 1016 pp_params.max_len = TSNEP_MAX_RX_BUF_SIZE; 1017 pp_params.offset = TSNEP_RX_OFFSET; 1018 rx->page_pool = page_pool_create(&pp_params); 1019 if (IS_ERR(rx->page_pool)) { 1020 retval = PTR_ERR(rx->page_pool); 1021 rx->page_pool = NULL; 1022 goto failed; 1023 } 1024 1025 for (i = 0; i < TSNEP_RING_SIZE; i++) { 1026 entry = &rx->entry[i]; 1027 next_entry = &rx->entry[(i + 1) & TSNEP_RING_MASK]; 1028 entry->desc->next = __cpu_to_le64(next_entry->desc_dma); 1029 } 1030 1031 return 0; 1032 1033failed: 1034 tsnep_rx_ring_cleanup(rx); 1035 return retval; 1036} 1037 1038static void tsnep_rx_init(struct tsnep_rx *rx) 1039{ 1040 dma_addr_t dma; 1041 1042 dma = rx->entry[0].desc_dma | TSNEP_RESET_OWNER_COUNTER; 1043 iowrite32(DMA_ADDR_LOW(dma), rx->addr + TSNEP_RX_DESC_ADDR_LOW); 1044 iowrite32(DMA_ADDR_HIGH(dma), rx->addr + TSNEP_RX_DESC_ADDR_HIGH); 1045 rx->write = 0; 1046 rx->read = 0; 1047 rx->owner_counter = 1; 1048 rx->increment_owner_counter = TSNEP_RING_SIZE - 1; 1049} 1050 1051static void tsnep_rx_enable(struct tsnep_rx *rx) 1052{ 1053 /* descriptor properties shall be valid before hardware is notified */ 1054 dma_wmb(); 1055 1056 iowrite32(TSNEP_CONTROL_RX_ENABLE, rx->addr + TSNEP_CONTROL); 1057} 1058 1059static void tsnep_rx_disable(struct tsnep_rx *rx) 1060{ 1061 u32 val; 1062 1063 iowrite32(TSNEP_CONTROL_RX_DISABLE, rx->addr + TSNEP_CONTROL); 1064 readx_poll_timeout(ioread32, rx->addr + TSNEP_CONTROL, val, 1065 ((val & TSNEP_CONTROL_RX_ENABLE) == 0), 10000, 1066 1000000); 1067} 1068 1069static int tsnep_rx_desc_available(struct tsnep_rx *rx) 1070{ 1071 if (rx->read <= rx->write) 1072 return TSNEP_RING_SIZE - rx->write + rx->read - 1; 1073 else 1074 return rx->read - rx->write - 1; 1075} 1076 1077static void tsnep_rx_free_page_buffer(struct tsnep_rx *rx) 1078{ 1079 struct page **page; 1080 1081 /* last entry of page_buffer is always zero, because ring cannot be 1082 * filled completely 1083 */ 1084 page = rx->page_buffer; 1085 while (*page) { 1086 page_pool_put_full_page(rx->page_pool, *page, false); 1087 *page = NULL; 1088 page++; 1089 } 1090} 1091 1092static int tsnep_rx_alloc_page_buffer(struct tsnep_rx *rx) 1093{ 1094 int i; 1095 1096 /* alloc for all ring entries except the last one, because ring cannot 1097 * be filled completely 1098 */ 1099 for (i = 0; i < TSNEP_RING_SIZE - 1; i++) { 1100 rx->page_buffer[i] = page_pool_dev_alloc_pages(rx->page_pool); 1101 if (!rx->page_buffer[i]) { 1102 tsnep_rx_free_page_buffer(rx); 1103 1104 return -ENOMEM; 1105 } 1106 } 1107 1108 return 0; 1109} 1110 1111static void tsnep_rx_set_page(struct tsnep_rx *rx, struct tsnep_rx_entry *entry, 1112 struct page *page) 1113{ 1114 entry->page = page; 1115 entry->len = TSNEP_MAX_RX_BUF_SIZE; 1116 entry->dma = page_pool_get_dma_addr(entry->page); 1117 entry->desc->rx = __cpu_to_le64(entry->dma + TSNEP_RX_OFFSET); 1118} 1119 1120static int tsnep_rx_alloc_buffer(struct tsnep_rx *rx, int index) 1121{ 1122 struct tsnep_rx_entry *entry = &rx->entry[index]; 1123 struct page *page; 1124 1125 page = page_pool_dev_alloc_pages(rx->page_pool); 1126 if (unlikely(!page)) 1127 return -ENOMEM; 1128 tsnep_rx_set_page(rx, entry, page); 1129 1130 return 0; 1131} 1132 1133static void tsnep_rx_reuse_buffer(struct tsnep_rx *rx, int index) 1134{ 1135 struct tsnep_rx_entry *entry = &rx->entry[index]; 1136 struct tsnep_rx_entry *read = &rx->entry[rx->read]; 1137 1138 tsnep_rx_set_page(rx, entry, read->page); 1139 read->page = NULL; 1140} 1141 1142static void tsnep_rx_activate(struct tsnep_rx *rx, int index) 1143{ 1144 struct tsnep_rx_entry *entry = &rx->entry[index]; 1145 1146 /* TSNEP_MAX_RX_BUF_SIZE and TSNEP_XSK_RX_BUF_SIZE are multiple of 4 */ 1147 entry->properties = entry->len & TSNEP_DESC_LENGTH_MASK; 1148 entry->properties |= TSNEP_DESC_INTERRUPT_FLAG; 1149 if (index == rx->increment_owner_counter) { 1150 rx->owner_counter++; 1151 if (rx->owner_counter == 4) 1152 rx->owner_counter = 1; 1153 rx->increment_owner_counter--; 1154 if (rx->increment_owner_counter < 0) 1155 rx->increment_owner_counter = TSNEP_RING_SIZE - 1; 1156 } 1157 entry->properties |= 1158 (rx->owner_counter << TSNEP_DESC_OWNER_COUNTER_SHIFT) & 1159 TSNEP_DESC_OWNER_COUNTER_MASK; 1160 1161 /* descriptor properties shall be written last, because valid data is 1162 * signaled there 1163 */ 1164 dma_wmb(); 1165 1166 entry->desc->properties = __cpu_to_le32(entry->properties); 1167} 1168 1169static int tsnep_rx_alloc(struct tsnep_rx *rx, int count, bool reuse) 1170{ 1171 bool alloc_failed = false; 1172 int i, index; 1173 1174 for (i = 0; i < count && !alloc_failed; i++) { 1175 index = (rx->write + i) & TSNEP_RING_MASK; 1176 1177 if (unlikely(tsnep_rx_alloc_buffer(rx, index))) { 1178 rx->alloc_failed++; 1179 alloc_failed = true; 1180 1181 /* reuse only if no other allocation was successful */ 1182 if (i == 0 && reuse) 1183 tsnep_rx_reuse_buffer(rx, index); 1184 else 1185 break; 1186 } 1187 1188 tsnep_rx_activate(rx, index); 1189 } 1190 1191 if (i) 1192 rx->write = (rx->write + i) & TSNEP_RING_MASK; 1193 1194 return i; 1195} 1196 1197static int tsnep_rx_refill(struct tsnep_rx *rx, int count, bool reuse) 1198{ 1199 int desc_refilled; 1200 1201 desc_refilled = tsnep_rx_alloc(rx, count, reuse); 1202 if (desc_refilled) 1203 tsnep_rx_enable(rx); 1204 1205 return desc_refilled; 1206} 1207 1208static void tsnep_rx_set_xdp(struct tsnep_rx *rx, struct tsnep_rx_entry *entry, 1209 struct xdp_buff *xdp) 1210{ 1211 entry->xdp = xdp; 1212 entry->len = TSNEP_XSK_RX_BUF_SIZE; 1213 entry->dma = xsk_buff_xdp_get_dma(entry->xdp); 1214 entry->desc->rx = __cpu_to_le64(entry->dma); 1215} 1216 1217static void tsnep_rx_reuse_buffer_zc(struct tsnep_rx *rx, int index) 1218{ 1219 struct tsnep_rx_entry *entry = &rx->entry[index]; 1220 struct tsnep_rx_entry *read = &rx->entry[rx->read]; 1221 1222 tsnep_rx_set_xdp(rx, entry, read->xdp); 1223 read->xdp = NULL; 1224} 1225 1226static int tsnep_rx_alloc_zc(struct tsnep_rx *rx, int count, bool reuse) 1227{ 1228 u32 allocated; 1229 int i; 1230 1231 allocated = xsk_buff_alloc_batch(rx->xsk_pool, rx->xdp_batch, count); 1232 for (i = 0; i < allocated; i++) { 1233 int index = (rx->write + i) & TSNEP_RING_MASK; 1234 struct tsnep_rx_entry *entry = &rx->entry[index]; 1235 1236 tsnep_rx_set_xdp(rx, entry, rx->xdp_batch[i]); 1237 tsnep_rx_activate(rx, index); 1238 } 1239 if (i == 0) { 1240 rx->alloc_failed++; 1241 1242 if (reuse) { 1243 tsnep_rx_reuse_buffer_zc(rx, rx->write); 1244 tsnep_rx_activate(rx, rx->write); 1245 } 1246 } 1247 1248 if (i) 1249 rx->write = (rx->write + i) & TSNEP_RING_MASK; 1250 1251 return i; 1252} 1253 1254static void tsnep_rx_free_zc(struct tsnep_rx *rx) 1255{ 1256 int i; 1257 1258 for (i = 0; i < TSNEP_RING_SIZE; i++) { 1259 struct tsnep_rx_entry *entry = &rx->entry[i]; 1260 1261 if (entry->xdp) 1262 xsk_buff_free(entry->xdp); 1263 entry->xdp = NULL; 1264 } 1265} 1266 1267static int tsnep_rx_refill_zc(struct tsnep_rx *rx, int count, bool reuse) 1268{ 1269 int desc_refilled; 1270 1271 desc_refilled = tsnep_rx_alloc_zc(rx, count, reuse); 1272 if (desc_refilled) 1273 tsnep_rx_enable(rx); 1274 1275 return desc_refilled; 1276} 1277 1278static void tsnep_xsk_rx_need_wakeup(struct tsnep_rx *rx, int desc_available) 1279{ 1280 if (desc_available) 1281 xsk_set_rx_need_wakeup(rx->xsk_pool); 1282 else 1283 xsk_clear_rx_need_wakeup(rx->xsk_pool); 1284} 1285 1286static bool tsnep_xdp_run_prog(struct tsnep_rx *rx, struct bpf_prog *prog, 1287 struct xdp_buff *xdp, int *status, 1288 struct netdev_queue *tx_nq, struct tsnep_tx *tx) 1289{ 1290 unsigned int length; 1291 unsigned int sync; 1292 u32 act; 1293 1294 length = xdp->data_end - xdp->data_hard_start - XDP_PACKET_HEADROOM; 1295 1296 act = bpf_prog_run_xdp(prog, xdp); 1297 switch (act) { 1298 case XDP_PASS: 1299 return false; 1300 case XDP_TX: 1301 if (!tsnep_xdp_xmit_back(rx->adapter, xdp, tx_nq, tx, false)) 1302 goto out_failure; 1303 *status |= TSNEP_XDP_TX; 1304 return true; 1305 case XDP_REDIRECT: 1306 if (xdp_do_redirect(rx->adapter->netdev, xdp, prog) < 0) 1307 goto out_failure; 1308 *status |= TSNEP_XDP_REDIRECT; 1309 return true; 1310 default: 1311 bpf_warn_invalid_xdp_action(rx->adapter->netdev, prog, act); 1312 fallthrough; 1313 case XDP_ABORTED: 1314out_failure: 1315 trace_xdp_exception(rx->adapter->netdev, prog, act); 1316 fallthrough; 1317 case XDP_DROP: 1318 /* Due xdp_adjust_tail: DMA sync for_device cover max len CPU 1319 * touch 1320 */ 1321 sync = xdp->data_end - xdp->data_hard_start - 1322 XDP_PACKET_HEADROOM; 1323 sync = max(sync, length); 1324 page_pool_put_page(rx->page_pool, virt_to_head_page(xdp->data), 1325 sync, true); 1326 return true; 1327 } 1328} 1329 1330static bool tsnep_xdp_run_prog_zc(struct tsnep_rx *rx, struct bpf_prog *prog, 1331 struct xdp_buff *xdp, int *status, 1332 struct netdev_queue *tx_nq, 1333 struct tsnep_tx *tx) 1334{ 1335 u32 act; 1336 1337 act = bpf_prog_run_xdp(prog, xdp); 1338 1339 /* XDP_REDIRECT is the main action for zero-copy */ 1340 if (likely(act == XDP_REDIRECT)) { 1341 if (xdp_do_redirect(rx->adapter->netdev, xdp, prog) < 0) 1342 goto out_failure; 1343 *status |= TSNEP_XDP_REDIRECT; 1344 return true; 1345 } 1346 1347 switch (act) { 1348 case XDP_PASS: 1349 return false; 1350 case XDP_TX: 1351 if (!tsnep_xdp_xmit_back(rx->adapter, xdp, tx_nq, tx, true)) 1352 goto out_failure; 1353 *status |= TSNEP_XDP_TX; 1354 return true; 1355 default: 1356 bpf_warn_invalid_xdp_action(rx->adapter->netdev, prog, act); 1357 fallthrough; 1358 case XDP_ABORTED: 1359out_failure: 1360 trace_xdp_exception(rx->adapter->netdev, prog, act); 1361 fallthrough; 1362 case XDP_DROP: 1363 xsk_buff_free(xdp); 1364 return true; 1365 } 1366} 1367 1368static void tsnep_finalize_xdp(struct tsnep_adapter *adapter, int status, 1369 struct netdev_queue *tx_nq, struct tsnep_tx *tx) 1370{ 1371 if (status & TSNEP_XDP_TX) { 1372 __netif_tx_lock(tx_nq, smp_processor_id()); 1373 tsnep_xdp_xmit_flush(tx); 1374 __netif_tx_unlock(tx_nq); 1375 } 1376 1377 if (status & TSNEP_XDP_REDIRECT) 1378 xdp_do_flush(); 1379} 1380 1381static struct sk_buff *tsnep_build_skb(struct tsnep_rx *rx, struct page *page, 1382 int length) 1383{ 1384 struct sk_buff *skb; 1385 1386 skb = napi_build_skb(page_address(page), PAGE_SIZE); 1387 if (unlikely(!skb)) 1388 return NULL; 1389 1390 /* update pointers within the skb to store the data */ 1391 skb_reserve(skb, TSNEP_RX_OFFSET + TSNEP_RX_INLINE_METADATA_SIZE); 1392 __skb_put(skb, length - ETH_FCS_LEN); 1393 1394 if (rx->adapter->hwtstamp_config.rx_filter == HWTSTAMP_FILTER_ALL) { 1395 struct skb_shared_hwtstamps *hwtstamps = skb_hwtstamps(skb); 1396 struct tsnep_rx_inline *rx_inline = 1397 (struct tsnep_rx_inline *)(page_address(page) + 1398 TSNEP_RX_OFFSET); 1399 1400 skb_shinfo(skb)->tx_flags |= 1401 SKBTX_HW_TSTAMP_NETDEV; 1402 memset(hwtstamps, 0, sizeof(*hwtstamps)); 1403 hwtstamps->netdev_data = rx_inline; 1404 } 1405 1406 skb_record_rx_queue(skb, rx->queue_index); 1407 skb->protocol = eth_type_trans(skb, rx->adapter->netdev); 1408 1409 return skb; 1410} 1411 1412static void tsnep_rx_page(struct tsnep_rx *rx, struct napi_struct *napi, 1413 struct page *page, int length) 1414{ 1415 struct sk_buff *skb; 1416 1417 skb = tsnep_build_skb(rx, page, length); 1418 if (skb) { 1419 skb_mark_for_recycle(skb); 1420 1421 rx->packets++; 1422 rx->bytes += length; 1423 if (skb->pkt_type == PACKET_MULTICAST) 1424 rx->multicast++; 1425 1426 napi_gro_receive(napi, skb); 1427 } else { 1428 page_pool_recycle_direct(rx->page_pool, page); 1429 1430 rx->dropped++; 1431 } 1432} 1433 1434static int tsnep_rx_poll(struct tsnep_rx *rx, struct napi_struct *napi, 1435 int budget) 1436{ 1437 struct device *dmadev = rx->adapter->dmadev; 1438 enum dma_data_direction dma_dir; 1439 struct tsnep_rx_entry *entry; 1440 struct netdev_queue *tx_nq; 1441 struct bpf_prog *prog; 1442 struct xdp_buff xdp; 1443 struct tsnep_tx *tx; 1444 int desc_available; 1445 int xdp_status = 0; 1446 int done = 0; 1447 int length; 1448 1449 desc_available = tsnep_rx_desc_available(rx); 1450 dma_dir = page_pool_get_dma_dir(rx->page_pool); 1451 prog = READ_ONCE(rx->adapter->xdp_prog); 1452 if (prog) { 1453 tx_nq = netdev_get_tx_queue(rx->adapter->netdev, 1454 rx->tx_queue_index); 1455 tx = &rx->adapter->tx[rx->tx_queue_index]; 1456 1457 xdp_init_buff(&xdp, PAGE_SIZE, &rx->xdp_rxq); 1458 } 1459 1460 while (likely(done < budget) && (rx->read != rx->write)) { 1461 entry = &rx->entry[rx->read]; 1462 if ((__le32_to_cpu(entry->desc_wb->properties) & 1463 TSNEP_DESC_OWNER_COUNTER_MASK) != 1464 (entry->properties & TSNEP_DESC_OWNER_COUNTER_MASK)) 1465 break; 1466 done++; 1467 1468 if (desc_available >= TSNEP_RING_RX_REFILL) { 1469 bool reuse = desc_available >= TSNEP_RING_RX_REUSE; 1470 1471 desc_available -= tsnep_rx_refill(rx, desc_available, 1472 reuse); 1473 if (!entry->page) { 1474 /* buffer has been reused for refill to prevent 1475 * empty RX ring, thus buffer cannot be used for 1476 * RX processing 1477 */ 1478 rx->read = (rx->read + 1) & TSNEP_RING_MASK; 1479 desc_available++; 1480 1481 rx->dropped++; 1482 1483 continue; 1484 } 1485 } 1486 1487 /* descriptor properties shall be read first, because valid data 1488 * is signaled there 1489 */ 1490 dma_rmb(); 1491 1492 prefetch(page_address(entry->page) + TSNEP_RX_OFFSET); 1493 length = __le32_to_cpu(entry->desc_wb->properties) & 1494 TSNEP_DESC_LENGTH_MASK; 1495 dma_sync_single_range_for_cpu(dmadev, entry->dma, 1496 TSNEP_RX_OFFSET, length, dma_dir); 1497 1498 /* RX metadata with timestamps is in front of actual data, 1499 * subtract metadata size to get length of actual data and 1500 * consider metadata size as offset of actual data during RX 1501 * processing 1502 */ 1503 length -= TSNEP_RX_INLINE_METADATA_SIZE; 1504 1505 rx->read = (rx->read + 1) & TSNEP_RING_MASK; 1506 desc_available++; 1507 1508 if (prog) { 1509 bool consume; 1510 1511 xdp_prepare_buff(&xdp, page_address(entry->page), 1512 XDP_PACKET_HEADROOM + TSNEP_RX_INLINE_METADATA_SIZE, 1513 length - ETH_FCS_LEN, false); 1514 1515 consume = tsnep_xdp_run_prog(rx, prog, &xdp, 1516 &xdp_status, tx_nq, tx); 1517 if (consume) { 1518 rx->packets++; 1519 rx->bytes += length; 1520 1521 entry->page = NULL; 1522 1523 continue; 1524 } 1525 } 1526 1527 tsnep_rx_page(rx, napi, entry->page, length); 1528 entry->page = NULL; 1529 } 1530 1531 if (xdp_status) 1532 tsnep_finalize_xdp(rx->adapter, xdp_status, tx_nq, tx); 1533 1534 if (desc_available) 1535 tsnep_rx_refill(rx, desc_available, false); 1536 1537 return done; 1538} 1539 1540static int tsnep_rx_poll_zc(struct tsnep_rx *rx, struct napi_struct *napi, 1541 int budget) 1542{ 1543 struct tsnep_rx_entry *entry; 1544 struct netdev_queue *tx_nq; 1545 struct bpf_prog *prog; 1546 struct tsnep_tx *tx; 1547 int desc_available; 1548 int xdp_status = 0; 1549 struct page *page; 1550 int done = 0; 1551 int length; 1552 1553 desc_available = tsnep_rx_desc_available(rx); 1554 prog = READ_ONCE(rx->adapter->xdp_prog); 1555 if (prog) { 1556 tx_nq = netdev_get_tx_queue(rx->adapter->netdev, 1557 rx->tx_queue_index); 1558 tx = &rx->adapter->tx[rx->tx_queue_index]; 1559 } 1560 1561 while (likely(done < budget) && (rx->read != rx->write)) { 1562 entry = &rx->entry[rx->read]; 1563 if ((__le32_to_cpu(entry->desc_wb->properties) & 1564 TSNEP_DESC_OWNER_COUNTER_MASK) != 1565 (entry->properties & TSNEP_DESC_OWNER_COUNTER_MASK)) 1566 break; 1567 done++; 1568 1569 if (desc_available >= TSNEP_RING_RX_REFILL) { 1570 bool reuse = desc_available >= TSNEP_RING_RX_REUSE; 1571 1572 desc_available -= tsnep_rx_refill_zc(rx, desc_available, 1573 reuse); 1574 if (!entry->xdp) { 1575 /* buffer has been reused for refill to prevent 1576 * empty RX ring, thus buffer cannot be used for 1577 * RX processing 1578 */ 1579 rx->read = (rx->read + 1) & TSNEP_RING_MASK; 1580 desc_available++; 1581 1582 rx->dropped++; 1583 1584 continue; 1585 } 1586 } 1587 1588 /* descriptor properties shall be read first, because valid data 1589 * is signaled there 1590 */ 1591 dma_rmb(); 1592 1593 prefetch(entry->xdp->data); 1594 length = __le32_to_cpu(entry->desc_wb->properties) & 1595 TSNEP_DESC_LENGTH_MASK; 1596 xsk_buff_set_size(entry->xdp, length - ETH_FCS_LEN); 1597 xsk_buff_dma_sync_for_cpu(entry->xdp); 1598 1599 /* RX metadata with timestamps is in front of actual data, 1600 * subtract metadata size to get length of actual data and 1601 * consider metadata size as offset of actual data during RX 1602 * processing 1603 */ 1604 length -= TSNEP_RX_INLINE_METADATA_SIZE; 1605 1606 rx->read = (rx->read + 1) & TSNEP_RING_MASK; 1607 desc_available++; 1608 1609 if (prog) { 1610 bool consume; 1611 1612 entry->xdp->data += TSNEP_RX_INLINE_METADATA_SIZE; 1613 entry->xdp->data_meta += TSNEP_RX_INLINE_METADATA_SIZE; 1614 1615 consume = tsnep_xdp_run_prog_zc(rx, prog, entry->xdp, 1616 &xdp_status, tx_nq, tx); 1617 if (consume) { 1618 rx->packets++; 1619 rx->bytes += length; 1620 1621 entry->xdp = NULL; 1622 1623 continue; 1624 } 1625 } 1626 1627 page = page_pool_dev_alloc_pages(rx->page_pool); 1628 if (page) { 1629 memcpy(page_address(page) + TSNEP_RX_OFFSET, 1630 entry->xdp->data - TSNEP_RX_INLINE_METADATA_SIZE, 1631 length + TSNEP_RX_INLINE_METADATA_SIZE); 1632 tsnep_rx_page(rx, napi, page, length); 1633 } else { 1634 rx->dropped++; 1635 } 1636 xsk_buff_free(entry->xdp); 1637 entry->xdp = NULL; 1638 } 1639 1640 if (xdp_status) 1641 tsnep_finalize_xdp(rx->adapter, xdp_status, tx_nq, tx); 1642 1643 if (desc_available) 1644 desc_available -= tsnep_rx_refill_zc(rx, desc_available, false); 1645 1646 if (xsk_uses_need_wakeup(rx->xsk_pool)) { 1647 tsnep_xsk_rx_need_wakeup(rx, desc_available); 1648 1649 return done; 1650 } 1651 1652 return desc_available ? budget : done; 1653} 1654 1655static bool tsnep_rx_pending(struct tsnep_rx *rx) 1656{ 1657 struct tsnep_rx_entry *entry; 1658 1659 if (rx->read != rx->write) { 1660 entry = &rx->entry[rx->read]; 1661 if ((__le32_to_cpu(entry->desc_wb->properties) & 1662 TSNEP_DESC_OWNER_COUNTER_MASK) == 1663 (entry->properties & TSNEP_DESC_OWNER_COUNTER_MASK)) 1664 return true; 1665 } 1666 1667 return false; 1668} 1669 1670static int tsnep_rx_open(struct tsnep_rx *rx) 1671{ 1672 int desc_available; 1673 int retval; 1674 1675 retval = tsnep_rx_ring_create(rx); 1676 if (retval) 1677 return retval; 1678 1679 tsnep_rx_init(rx); 1680 1681 desc_available = tsnep_rx_desc_available(rx); 1682 if (rx->xsk_pool) 1683 retval = tsnep_rx_alloc_zc(rx, desc_available, false); 1684 else 1685 retval = tsnep_rx_alloc(rx, desc_available, false); 1686 if (retval != desc_available) { 1687 retval = -ENOMEM; 1688 1689 goto alloc_failed; 1690 } 1691 1692 /* prealloc pages to prevent allocation failures when XSK pool is 1693 * disabled at runtime 1694 */ 1695 if (rx->xsk_pool) { 1696 retval = tsnep_rx_alloc_page_buffer(rx); 1697 if (retval) 1698 goto alloc_failed; 1699 } 1700 1701 return 0; 1702 1703alloc_failed: 1704 tsnep_rx_ring_cleanup(rx); 1705 return retval; 1706} 1707 1708static void tsnep_rx_close(struct tsnep_rx *rx) 1709{ 1710 if (rx->xsk_pool) 1711 tsnep_rx_free_page_buffer(rx); 1712 1713 tsnep_rx_ring_cleanup(rx); 1714} 1715 1716static void tsnep_rx_reopen(struct tsnep_rx *rx) 1717{ 1718 struct page **page = rx->page_buffer; 1719 int i; 1720 1721 tsnep_rx_init(rx); 1722 1723 for (i = 0; i < TSNEP_RING_SIZE; i++) { 1724 struct tsnep_rx_entry *entry = &rx->entry[i]; 1725 1726 /* defined initial values for properties are required for 1727 * correct owner counter checking 1728 */ 1729 entry->desc->properties = 0; 1730 entry->desc_wb->properties = 0; 1731 1732 /* prevent allocation failures by reusing kept pages */ 1733 if (*page) { 1734 tsnep_rx_set_page(rx, entry, *page); 1735 tsnep_rx_activate(rx, rx->write); 1736 rx->write++; 1737 1738 *page = NULL; 1739 page++; 1740 } 1741 } 1742} 1743 1744static void tsnep_rx_reopen_xsk(struct tsnep_rx *rx) 1745{ 1746 struct page **page = rx->page_buffer; 1747 u32 allocated; 1748 int i; 1749 1750 tsnep_rx_init(rx); 1751 1752 /* alloc all ring entries except the last one, because ring cannot be 1753 * filled completely, as many buffers as possible is enough as wakeup is 1754 * done if new buffers are available 1755 */ 1756 allocated = xsk_buff_alloc_batch(rx->xsk_pool, rx->xdp_batch, 1757 TSNEP_RING_SIZE - 1); 1758 1759 for (i = 0; i < TSNEP_RING_SIZE; i++) { 1760 struct tsnep_rx_entry *entry = &rx->entry[i]; 1761 1762 /* keep pages to prevent allocation failures when xsk is 1763 * disabled 1764 */ 1765 if (entry->page) { 1766 *page = entry->page; 1767 entry->page = NULL; 1768 1769 page++; 1770 } 1771 1772 /* defined initial values for properties are required for 1773 * correct owner counter checking 1774 */ 1775 entry->desc->properties = 0; 1776 entry->desc_wb->properties = 0; 1777 1778 if (allocated) { 1779 tsnep_rx_set_xdp(rx, entry, 1780 rx->xdp_batch[allocated - 1]); 1781 tsnep_rx_activate(rx, rx->write); 1782 rx->write++; 1783 1784 allocated--; 1785 } 1786 } 1787 1788 /* set need wakeup flag immediately if ring is not filled completely, 1789 * first polling would be too late as need wakeup signalisation would 1790 * be delayed for an indefinite time 1791 */ 1792 if (xsk_uses_need_wakeup(rx->xsk_pool)) 1793 tsnep_xsk_rx_need_wakeup(rx, tsnep_rx_desc_available(rx)); 1794} 1795 1796static bool tsnep_pending(struct tsnep_queue *queue) 1797{ 1798 if (queue->tx && tsnep_tx_pending(queue->tx)) 1799 return true; 1800 1801 if (queue->rx && tsnep_rx_pending(queue->rx)) 1802 return true; 1803 1804 return false; 1805} 1806 1807static int tsnep_poll(struct napi_struct *napi, int budget) 1808{ 1809 struct tsnep_queue *queue = container_of(napi, struct tsnep_queue, 1810 napi); 1811 bool complete = true; 1812 int done = 0; 1813 1814 if (queue->tx) 1815 complete = tsnep_tx_poll(queue->tx, budget); 1816 1817 /* handle case where we are called by netpoll with a budget of 0 */ 1818 if (unlikely(budget <= 0)) 1819 return budget; 1820 1821 if (queue->rx) { 1822 done = queue->rx->xsk_pool ? 1823 tsnep_rx_poll_zc(queue->rx, napi, budget) : 1824 tsnep_rx_poll(queue->rx, napi, budget); 1825 if (done >= budget) 1826 complete = false; 1827 } 1828 1829 /* if all work not completed, return budget and keep polling */ 1830 if (!complete) 1831 return budget; 1832 1833 if (likely(napi_complete_done(napi, done))) { 1834 tsnep_enable_irq(queue->adapter, queue->irq_mask); 1835 1836 /* reschedule if work is already pending, prevent rotten packets 1837 * which are transmitted or received after polling but before 1838 * interrupt enable 1839 */ 1840 if (tsnep_pending(queue)) { 1841 tsnep_disable_irq(queue->adapter, queue->irq_mask); 1842 napi_schedule(napi); 1843 } 1844 } 1845 1846 return min(done, budget - 1); 1847} 1848 1849static int tsnep_request_irq(struct tsnep_queue *queue, bool first) 1850{ 1851 const char *name = netdev_name(queue->adapter->netdev); 1852 irq_handler_t handler; 1853 void *dev; 1854 int retval; 1855 1856 if (first) { 1857 sprintf(queue->name, "%s-mac", name); 1858 handler = tsnep_irq; 1859 dev = queue->adapter; 1860 } else { 1861 if (queue->tx && queue->rx) 1862 snprintf(queue->name, sizeof(queue->name), "%s-txrx-%d", 1863 name, queue->rx->queue_index); 1864 else if (queue->tx) 1865 snprintf(queue->name, sizeof(queue->name), "%s-tx-%d", 1866 name, queue->tx->queue_index); 1867 else 1868 snprintf(queue->name, sizeof(queue->name), "%s-rx-%d", 1869 name, queue->rx->queue_index); 1870 handler = tsnep_irq_txrx; 1871 dev = queue; 1872 } 1873 1874 retval = request_irq(queue->irq, handler, 0, queue->name, dev); 1875 if (retval) { 1876 /* if name is empty, then interrupt won't be freed */ 1877 memset(queue->name, 0, sizeof(queue->name)); 1878 } 1879 1880 return retval; 1881} 1882 1883static void tsnep_free_irq(struct tsnep_queue *queue, bool first) 1884{ 1885 void *dev; 1886 1887 if (!strlen(queue->name)) 1888 return; 1889 1890 if (first) 1891 dev = queue->adapter; 1892 else 1893 dev = queue; 1894 1895 free_irq(queue->irq, dev); 1896 memset(queue->name, 0, sizeof(queue->name)); 1897} 1898 1899static void tsnep_queue_close(struct tsnep_queue *queue, bool first) 1900{ 1901 struct tsnep_rx *rx = queue->rx; 1902 1903 tsnep_free_irq(queue, first); 1904 1905 if (rx) { 1906 if (xdp_rxq_info_is_reg(&rx->xdp_rxq)) 1907 xdp_rxq_info_unreg(&rx->xdp_rxq); 1908 if (xdp_rxq_info_is_reg(&rx->xdp_rxq_zc)) 1909 xdp_rxq_info_unreg(&rx->xdp_rxq_zc); 1910 } 1911 1912 netif_napi_del(&queue->napi); 1913} 1914 1915static int tsnep_queue_open(struct tsnep_adapter *adapter, 1916 struct tsnep_queue *queue, bool first) 1917{ 1918 struct tsnep_rx *rx = queue->rx; 1919 struct tsnep_tx *tx = queue->tx; 1920 int retval; 1921 1922 netif_napi_add(adapter->netdev, &queue->napi, tsnep_poll); 1923 1924 if (rx) { 1925 /* choose TX queue for XDP_TX */ 1926 if (tx) 1927 rx->tx_queue_index = tx->queue_index; 1928 else if (rx->queue_index < adapter->num_tx_queues) 1929 rx->tx_queue_index = rx->queue_index; 1930 else 1931 rx->tx_queue_index = 0; 1932 1933 /* prepare both memory models to eliminate possible registration 1934 * errors when memory model is switched between page pool and 1935 * XSK pool during runtime 1936 */ 1937 retval = xdp_rxq_info_reg(&rx->xdp_rxq, adapter->netdev, 1938 rx->queue_index, queue->napi.napi_id); 1939 if (retval) 1940 goto failed; 1941 retval = xdp_rxq_info_reg_mem_model(&rx->xdp_rxq, 1942 MEM_TYPE_PAGE_POOL, 1943 rx->page_pool); 1944 if (retval) 1945 goto failed; 1946 retval = xdp_rxq_info_reg(&rx->xdp_rxq_zc, adapter->netdev, 1947 rx->queue_index, queue->napi.napi_id); 1948 if (retval) 1949 goto failed; 1950 retval = xdp_rxq_info_reg_mem_model(&rx->xdp_rxq_zc, 1951 MEM_TYPE_XSK_BUFF_POOL, 1952 NULL); 1953 if (retval) 1954 goto failed; 1955 if (rx->xsk_pool) 1956 xsk_pool_set_rxq_info(rx->xsk_pool, &rx->xdp_rxq_zc); 1957 } 1958 1959 retval = tsnep_request_irq(queue, first); 1960 if (retval) { 1961 netif_err(adapter, drv, adapter->netdev, 1962 "can't get assigned irq %d.\n", queue->irq); 1963 goto failed; 1964 } 1965 1966 return 0; 1967 1968failed: 1969 tsnep_queue_close(queue, first); 1970 1971 return retval; 1972} 1973 1974static void tsnep_queue_enable(struct tsnep_queue *queue) 1975{ 1976 struct tsnep_adapter *adapter = queue->adapter; 1977 1978 netif_napi_set_irq(&queue->napi, queue->irq); 1979 napi_enable(&queue->napi); 1980 tsnep_enable_irq(adapter, queue->irq_mask); 1981 1982 if (queue->tx) { 1983 netif_queue_set_napi(adapter->netdev, queue->tx->queue_index, 1984 NETDEV_QUEUE_TYPE_TX, &queue->napi); 1985 tsnep_tx_enable(queue->tx); 1986 } 1987 1988 if (queue->rx) { 1989 netif_queue_set_napi(adapter->netdev, queue->rx->queue_index, 1990 NETDEV_QUEUE_TYPE_RX, &queue->napi); 1991 tsnep_rx_enable(queue->rx); 1992 } 1993} 1994 1995static void tsnep_queue_disable(struct tsnep_queue *queue) 1996{ 1997 struct tsnep_adapter *adapter = queue->adapter; 1998 1999 if (queue->rx) 2000 netif_queue_set_napi(adapter->netdev, queue->rx->queue_index, 2001 NETDEV_QUEUE_TYPE_RX, NULL); 2002 2003 if (queue->tx) { 2004 tsnep_tx_disable(queue->tx, &queue->napi); 2005 netif_queue_set_napi(adapter->netdev, queue->tx->queue_index, 2006 NETDEV_QUEUE_TYPE_TX, NULL); 2007 } 2008 2009 napi_disable(&queue->napi); 2010 tsnep_disable_irq(adapter, queue->irq_mask); 2011 2012 /* disable RX after NAPI polling has been disabled, because RX can be 2013 * enabled during NAPI polling 2014 */ 2015 if (queue->rx) 2016 tsnep_rx_disable(queue->rx); 2017} 2018 2019static int tsnep_netdev_open(struct net_device *netdev) 2020{ 2021 struct tsnep_adapter *adapter = netdev_priv(netdev); 2022 int i, retval; 2023 2024 for (i = 0; i < adapter->num_queues; i++) { 2025 if (adapter->queue[i].tx) { 2026 retval = tsnep_tx_open(adapter->queue[i].tx); 2027 if (retval) 2028 goto failed; 2029 } 2030 if (adapter->queue[i].rx) { 2031 retval = tsnep_rx_open(adapter->queue[i].rx); 2032 if (retval) 2033 goto failed; 2034 } 2035 2036 retval = tsnep_queue_open(adapter, &adapter->queue[i], i == 0); 2037 if (retval) 2038 goto failed; 2039 } 2040 2041 retval = netif_set_real_num_tx_queues(adapter->netdev, 2042 adapter->num_tx_queues); 2043 if (retval) 2044 goto failed; 2045 retval = netif_set_real_num_rx_queues(adapter->netdev, 2046 adapter->num_rx_queues); 2047 if (retval) 2048 goto failed; 2049 2050 tsnep_enable_irq(adapter, ECM_INT_LINK); 2051 retval = tsnep_phy_open(adapter); 2052 if (retval) 2053 goto phy_failed; 2054 2055 for (i = 0; i < adapter->num_queues; i++) 2056 tsnep_queue_enable(&adapter->queue[i]); 2057 2058 return 0; 2059 2060phy_failed: 2061 tsnep_disable_irq(adapter, ECM_INT_LINK); 2062failed: 2063 for (i = 0; i < adapter->num_queues; i++) { 2064 tsnep_queue_close(&adapter->queue[i], i == 0); 2065 2066 if (adapter->queue[i].rx) 2067 tsnep_rx_close(adapter->queue[i].rx); 2068 if (adapter->queue[i].tx) 2069 tsnep_tx_close(adapter->queue[i].tx); 2070 } 2071 return retval; 2072} 2073 2074static int tsnep_netdev_close(struct net_device *netdev) 2075{ 2076 struct tsnep_adapter *adapter = netdev_priv(netdev); 2077 int i; 2078 2079 tsnep_disable_irq(adapter, ECM_INT_LINK); 2080 tsnep_phy_close(adapter); 2081 2082 for (i = 0; i < adapter->num_queues; i++) { 2083 tsnep_queue_disable(&adapter->queue[i]); 2084 2085 tsnep_queue_close(&adapter->queue[i], i == 0); 2086 2087 if (adapter->queue[i].rx) 2088 tsnep_rx_close(adapter->queue[i].rx); 2089 if (adapter->queue[i].tx) 2090 tsnep_tx_close(adapter->queue[i].tx); 2091 } 2092 2093 return 0; 2094} 2095 2096int tsnep_enable_xsk(struct tsnep_queue *queue, struct xsk_buff_pool *pool) 2097{ 2098 bool running = netif_running(queue->adapter->netdev); 2099 u32 frame_size; 2100 2101 frame_size = xsk_pool_get_rx_frame_size(pool); 2102 if (frame_size < TSNEP_XSK_RX_BUF_SIZE) 2103 return -EOPNOTSUPP; 2104 2105 queue->rx->page_buffer = kcalloc(TSNEP_RING_SIZE, 2106 sizeof(*queue->rx->page_buffer), 2107 GFP_KERNEL); 2108 if (!queue->rx->page_buffer) 2109 return -ENOMEM; 2110 queue->rx->xdp_batch = kcalloc(TSNEP_RING_SIZE, 2111 sizeof(*queue->rx->xdp_batch), 2112 GFP_KERNEL); 2113 if (!queue->rx->xdp_batch) { 2114 kfree(queue->rx->page_buffer); 2115 queue->rx->page_buffer = NULL; 2116 2117 return -ENOMEM; 2118 } 2119 2120 xsk_pool_set_rxq_info(pool, &queue->rx->xdp_rxq_zc); 2121 2122 if (running) 2123 tsnep_queue_disable(queue); 2124 2125 queue->tx->xsk_pool = pool; 2126 queue->rx->xsk_pool = pool; 2127 2128 if (running) { 2129 tsnep_rx_reopen_xsk(queue->rx); 2130 tsnep_queue_enable(queue); 2131 } 2132 2133 return 0; 2134} 2135 2136void tsnep_disable_xsk(struct tsnep_queue *queue) 2137{ 2138 bool running = netif_running(queue->adapter->netdev); 2139 2140 if (running) 2141 tsnep_queue_disable(queue); 2142 2143 tsnep_rx_free_zc(queue->rx); 2144 2145 queue->rx->xsk_pool = NULL; 2146 queue->tx->xsk_pool = NULL; 2147 2148 if (running) { 2149 tsnep_rx_reopen(queue->rx); 2150 tsnep_queue_enable(queue); 2151 } 2152 2153 kfree(queue->rx->xdp_batch); 2154 queue->rx->xdp_batch = NULL; 2155 kfree(queue->rx->page_buffer); 2156 queue->rx->page_buffer = NULL; 2157} 2158 2159static netdev_tx_t tsnep_netdev_xmit_frame(struct sk_buff *skb, 2160 struct net_device *netdev) 2161{ 2162 struct tsnep_adapter *adapter = netdev_priv(netdev); 2163 u16 queue_mapping = skb_get_queue_mapping(skb); 2164 2165 if (queue_mapping >= adapter->num_tx_queues) 2166 queue_mapping = 0; 2167 2168 return tsnep_xmit_frame_ring(skb, &adapter->tx[queue_mapping]); 2169} 2170 2171static void tsnep_netdev_set_multicast(struct net_device *netdev) 2172{ 2173 struct tsnep_adapter *adapter = netdev_priv(netdev); 2174 2175 u16 rx_filter = 0; 2176 2177 /* configured MAC address and broadcasts are never filtered */ 2178 if (netdev->flags & IFF_PROMISC) { 2179 rx_filter |= TSNEP_RX_FILTER_ACCEPT_ALL_MULTICASTS; 2180 rx_filter |= TSNEP_RX_FILTER_ACCEPT_ALL_UNICASTS; 2181 } else if (!netdev_mc_empty(netdev) || (netdev->flags & IFF_ALLMULTI)) { 2182 rx_filter |= TSNEP_RX_FILTER_ACCEPT_ALL_MULTICASTS; 2183 } 2184 iowrite16(rx_filter, adapter->addr + TSNEP_RX_FILTER); 2185} 2186 2187static void tsnep_netdev_get_stats64(struct net_device *netdev, 2188 struct rtnl_link_stats64 *stats) 2189{ 2190 struct tsnep_adapter *adapter = netdev_priv(netdev); 2191 u32 reg; 2192 u32 val; 2193 int i; 2194 2195 for (i = 0; i < adapter->num_tx_queues; i++) { 2196 stats->tx_packets += adapter->tx[i].packets; 2197 stats->tx_bytes += adapter->tx[i].bytes; 2198 stats->tx_dropped += adapter->tx[i].dropped; 2199 } 2200 for (i = 0; i < adapter->num_rx_queues; i++) { 2201 stats->rx_packets += adapter->rx[i].packets; 2202 stats->rx_bytes += adapter->rx[i].bytes; 2203 stats->rx_dropped += adapter->rx[i].dropped; 2204 stats->multicast += adapter->rx[i].multicast; 2205 2206 reg = ioread32(adapter->addr + TSNEP_QUEUE(i) + 2207 TSNEP_RX_STATISTIC); 2208 val = (reg & TSNEP_RX_STATISTIC_NO_DESC_MASK) >> 2209 TSNEP_RX_STATISTIC_NO_DESC_SHIFT; 2210 stats->rx_dropped += val; 2211 val = (reg & TSNEP_RX_STATISTIC_BUFFER_TOO_SMALL_MASK) >> 2212 TSNEP_RX_STATISTIC_BUFFER_TOO_SMALL_SHIFT; 2213 stats->rx_dropped += val; 2214 val = (reg & TSNEP_RX_STATISTIC_FIFO_OVERFLOW_MASK) >> 2215 TSNEP_RX_STATISTIC_FIFO_OVERFLOW_SHIFT; 2216 stats->rx_errors += val; 2217 stats->rx_fifo_errors += val; 2218 val = (reg & TSNEP_RX_STATISTIC_INVALID_FRAME_MASK) >> 2219 TSNEP_RX_STATISTIC_INVALID_FRAME_SHIFT; 2220 stats->rx_errors += val; 2221 stats->rx_frame_errors += val; 2222 } 2223 2224 reg = ioread32(adapter->addr + ECM_STAT); 2225 val = (reg & ECM_STAT_RX_ERR_MASK) >> ECM_STAT_RX_ERR_SHIFT; 2226 stats->rx_errors += val; 2227 val = (reg & ECM_STAT_INV_FRM_MASK) >> ECM_STAT_INV_FRM_SHIFT; 2228 stats->rx_errors += val; 2229 stats->rx_crc_errors += val; 2230 val = (reg & ECM_STAT_FWD_RX_ERR_MASK) >> ECM_STAT_FWD_RX_ERR_SHIFT; 2231 stats->rx_errors += val; 2232} 2233 2234static void tsnep_mac_set_address(struct tsnep_adapter *adapter, u8 *addr) 2235{ 2236 iowrite32(*(u32 *)addr, adapter->addr + TSNEP_MAC_ADDRESS_LOW); 2237 iowrite16(*(u16 *)(addr + sizeof(u32)), 2238 adapter->addr + TSNEP_MAC_ADDRESS_HIGH); 2239 2240 ether_addr_copy(adapter->mac_address, addr); 2241 netif_info(adapter, drv, adapter->netdev, "MAC address set to %pM\n", 2242 addr); 2243} 2244 2245static int tsnep_netdev_set_mac_address(struct net_device *netdev, void *addr) 2246{ 2247 struct tsnep_adapter *adapter = netdev_priv(netdev); 2248 struct sockaddr *sock_addr = addr; 2249 int retval; 2250 2251 retval = eth_prepare_mac_addr_change(netdev, sock_addr); 2252 if (retval) 2253 return retval; 2254 eth_hw_addr_set(netdev, sock_addr->sa_data); 2255 tsnep_mac_set_address(adapter, sock_addr->sa_data); 2256 2257 return 0; 2258} 2259 2260static int tsnep_netdev_set_features(struct net_device *netdev, 2261 netdev_features_t features) 2262{ 2263 struct tsnep_adapter *adapter = netdev_priv(netdev); 2264 netdev_features_t changed = netdev->features ^ features; 2265 bool enable; 2266 int retval = 0; 2267 2268 if (changed & NETIF_F_LOOPBACK) { 2269 enable = !!(features & NETIF_F_LOOPBACK); 2270 retval = tsnep_phy_loopback(adapter, enable); 2271 } 2272 2273 return retval; 2274} 2275 2276static ktime_t tsnep_netdev_get_tstamp(struct net_device *netdev, 2277 const struct skb_shared_hwtstamps *hwtstamps, 2278 bool cycles) 2279{ 2280 struct tsnep_rx_inline *rx_inline = hwtstamps->netdev_data; 2281 u64 timestamp; 2282 2283 if (cycles) 2284 timestamp = __le64_to_cpu(rx_inline->counter); 2285 else 2286 timestamp = __le64_to_cpu(rx_inline->timestamp); 2287 2288 return ns_to_ktime(timestamp); 2289} 2290 2291static int tsnep_netdev_bpf(struct net_device *dev, struct netdev_bpf *bpf) 2292{ 2293 struct tsnep_adapter *adapter = netdev_priv(dev); 2294 2295 switch (bpf->command) { 2296 case XDP_SETUP_PROG: 2297 return tsnep_xdp_setup_prog(adapter, bpf->prog, bpf->extack); 2298 case XDP_SETUP_XSK_POOL: 2299 return tsnep_xdp_setup_pool(adapter, bpf->xsk.pool, 2300 bpf->xsk.queue_id); 2301 default: 2302 return -EOPNOTSUPP; 2303 } 2304} 2305 2306static struct tsnep_tx *tsnep_xdp_get_tx(struct tsnep_adapter *adapter, u32 cpu) 2307{ 2308 if (cpu >= TSNEP_MAX_QUEUES) 2309 cpu &= TSNEP_MAX_QUEUES - 1; 2310 2311 while (cpu >= adapter->num_tx_queues) 2312 cpu -= adapter->num_tx_queues; 2313 2314 return &adapter->tx[cpu]; 2315} 2316 2317static int tsnep_netdev_xdp_xmit(struct net_device *dev, int n, 2318 struct xdp_frame **xdp, u32 flags) 2319{ 2320 struct tsnep_adapter *adapter = netdev_priv(dev); 2321 u32 cpu = smp_processor_id(); 2322 struct netdev_queue *nq; 2323 struct tsnep_tx *tx; 2324 int nxmit; 2325 bool xmit; 2326 2327 if (unlikely(flags & ~XDP_XMIT_FLAGS_MASK)) 2328 return -EINVAL; 2329 2330 tx = tsnep_xdp_get_tx(adapter, cpu); 2331 nq = netdev_get_tx_queue(adapter->netdev, tx->queue_index); 2332 2333 __netif_tx_lock(nq, cpu); 2334 2335 for (nxmit = 0; nxmit < n; nxmit++) { 2336 xmit = tsnep_xdp_xmit_frame_ring(xdp[nxmit], tx, 2337 TSNEP_TX_TYPE_XDP_NDO); 2338 if (!xmit) 2339 break; 2340 2341 /* avoid transmit queue timeout since we share it with the slow 2342 * path 2343 */ 2344 txq_trans_cond_update(nq); 2345 } 2346 2347 if (flags & XDP_XMIT_FLUSH) 2348 tsnep_xdp_xmit_flush(tx); 2349 2350 __netif_tx_unlock(nq); 2351 2352 return nxmit; 2353} 2354 2355static int tsnep_netdev_xsk_wakeup(struct net_device *dev, u32 queue_id, 2356 u32 flags) 2357{ 2358 struct tsnep_adapter *adapter = netdev_priv(dev); 2359 struct tsnep_queue *queue; 2360 2361 if (queue_id >= adapter->num_rx_queues || 2362 queue_id >= adapter->num_tx_queues) 2363 return -EINVAL; 2364 2365 queue = &adapter->queue[queue_id]; 2366 2367 if (!napi_if_scheduled_mark_missed(&queue->napi)) 2368 napi_schedule(&queue->napi); 2369 2370 return 0; 2371} 2372 2373static const struct net_device_ops tsnep_netdev_ops = { 2374 .ndo_open = tsnep_netdev_open, 2375 .ndo_stop = tsnep_netdev_close, 2376 .ndo_start_xmit = tsnep_netdev_xmit_frame, 2377 .ndo_eth_ioctl = phy_do_ioctl_running, 2378 .ndo_set_rx_mode = tsnep_netdev_set_multicast, 2379 .ndo_get_stats64 = tsnep_netdev_get_stats64, 2380 .ndo_set_mac_address = tsnep_netdev_set_mac_address, 2381 .ndo_set_features = tsnep_netdev_set_features, 2382 .ndo_get_tstamp = tsnep_netdev_get_tstamp, 2383 .ndo_setup_tc = tsnep_tc_setup, 2384 .ndo_bpf = tsnep_netdev_bpf, 2385 .ndo_xdp_xmit = tsnep_netdev_xdp_xmit, 2386 .ndo_xsk_wakeup = tsnep_netdev_xsk_wakeup, 2387 .ndo_hwtstamp_get = tsnep_ptp_hwtstamp_get, 2388 .ndo_hwtstamp_set = tsnep_ptp_hwtstamp_set, 2389}; 2390 2391static int tsnep_mac_init(struct tsnep_adapter *adapter) 2392{ 2393 int retval; 2394 2395 /* initialize RX filtering, at least configured MAC address and 2396 * broadcast are not filtered 2397 */ 2398 iowrite16(0, adapter->addr + TSNEP_RX_FILTER); 2399 2400 /* try to get MAC address in the following order: 2401 * - device tree 2402 * - valid MAC address already set 2403 * - MAC address register if valid 2404 * - random MAC address 2405 */ 2406 retval = of_get_mac_address(adapter->pdev->dev.of_node, 2407 adapter->mac_address); 2408 if (retval == -EPROBE_DEFER) 2409 return retval; 2410 if (retval && !is_valid_ether_addr(adapter->mac_address)) { 2411 *(u32 *)adapter->mac_address = 2412 ioread32(adapter->addr + TSNEP_MAC_ADDRESS_LOW); 2413 *(u16 *)(adapter->mac_address + sizeof(u32)) = 2414 ioread16(adapter->addr + TSNEP_MAC_ADDRESS_HIGH); 2415 if (!is_valid_ether_addr(adapter->mac_address)) 2416 eth_random_addr(adapter->mac_address); 2417 } 2418 2419 tsnep_mac_set_address(adapter, adapter->mac_address); 2420 eth_hw_addr_set(adapter->netdev, adapter->mac_address); 2421 2422 return 0; 2423} 2424 2425static int tsnep_mdio_init(struct tsnep_adapter *adapter) 2426{ 2427 struct device_node *np = adapter->pdev->dev.of_node; 2428 int retval; 2429 2430 if (np) { 2431 np = of_get_child_by_name(np, "mdio"); 2432 if (!np) 2433 return 0; 2434 2435 adapter->suppress_preamble = 2436 of_property_read_bool(np, "suppress-preamble"); 2437 } 2438 2439 adapter->mdiobus = devm_mdiobus_alloc(&adapter->pdev->dev); 2440 if (!adapter->mdiobus) { 2441 retval = -ENOMEM; 2442 2443 goto out; 2444 } 2445 2446 adapter->mdiobus->priv = (void *)adapter; 2447 adapter->mdiobus->parent = &adapter->pdev->dev; 2448 adapter->mdiobus->read = tsnep_mdiobus_read; 2449 adapter->mdiobus->write = tsnep_mdiobus_write; 2450 adapter->mdiobus->name = TSNEP "-mdiobus"; 2451 snprintf(adapter->mdiobus->id, MII_BUS_ID_SIZE, "%s", 2452 adapter->pdev->name); 2453 2454 /* do not scan broadcast address */ 2455 adapter->mdiobus->phy_mask = 0x0000001; 2456 2457 retval = of_mdiobus_register(adapter->mdiobus, np); 2458 2459out: 2460 of_node_put(np); 2461 2462 return retval; 2463} 2464 2465static int tsnep_phy_init(struct tsnep_adapter *adapter) 2466{ 2467 struct device_node *phy_node; 2468 int retval; 2469 2470 retval = of_get_phy_mode(adapter->pdev->dev.of_node, 2471 &adapter->phy_mode); 2472 if (retval) 2473 adapter->phy_mode = PHY_INTERFACE_MODE_GMII; 2474 2475 phy_node = of_parse_phandle(adapter->pdev->dev.of_node, "phy-handle", 2476 0); 2477 adapter->phydev = of_phy_find_device(phy_node); 2478 of_node_put(phy_node); 2479 if (!adapter->phydev && adapter->mdiobus) 2480 adapter->phydev = phy_find_first(adapter->mdiobus); 2481 if (!adapter->phydev) 2482 return -EIO; 2483 2484 return 0; 2485} 2486 2487static int tsnep_queue_init(struct tsnep_adapter *adapter, int queue_count) 2488{ 2489 u32 irq_mask = ECM_INT_TX_0 | ECM_INT_RX_0; 2490 char name[8]; 2491 int i; 2492 int retval; 2493 2494 /* one TX/RX queue pair for netdev is mandatory */ 2495 if (platform_irq_count(adapter->pdev) == 1) 2496 retval = platform_get_irq(adapter->pdev, 0); 2497 else 2498 retval = platform_get_irq_byname(adapter->pdev, "mac"); 2499 if (retval < 0) 2500 return retval; 2501 adapter->num_tx_queues = 1; 2502 adapter->num_rx_queues = 1; 2503 adapter->num_queues = 1; 2504 adapter->queue[0].adapter = adapter; 2505 adapter->queue[0].irq = retval; 2506 adapter->queue[0].tx = &adapter->tx[0]; 2507 adapter->queue[0].tx->adapter = adapter; 2508 adapter->queue[0].tx->addr = adapter->addr + TSNEP_QUEUE(0); 2509 adapter->queue[0].tx->queue_index = 0; 2510 adapter->queue[0].rx = &adapter->rx[0]; 2511 adapter->queue[0].rx->adapter = adapter; 2512 adapter->queue[0].rx->addr = adapter->addr + TSNEP_QUEUE(0); 2513 adapter->queue[0].rx->queue_index = 0; 2514 adapter->queue[0].irq_mask = irq_mask; 2515 adapter->queue[0].irq_delay_addr = adapter->addr + ECM_INT_DELAY; 2516 retval = tsnep_set_irq_coalesce(&adapter->queue[0], 2517 TSNEP_COALESCE_USECS_DEFAULT); 2518 if (retval < 0) 2519 return retval; 2520 2521 adapter->netdev->irq = adapter->queue[0].irq; 2522 2523 /* add additional TX/RX queue pairs only if dedicated interrupt is 2524 * available 2525 */ 2526 for (i = 1; i < queue_count; i++) { 2527 sprintf(name, "txrx-%d", i); 2528 retval = platform_get_irq_byname_optional(adapter->pdev, name); 2529 if (retval < 0) 2530 break; 2531 2532 adapter->num_tx_queues++; 2533 adapter->num_rx_queues++; 2534 adapter->num_queues++; 2535 adapter->queue[i].adapter = adapter; 2536 adapter->queue[i].irq = retval; 2537 adapter->queue[i].tx = &adapter->tx[i]; 2538 adapter->queue[i].tx->adapter = adapter; 2539 adapter->queue[i].tx->addr = adapter->addr + TSNEP_QUEUE(i); 2540 adapter->queue[i].tx->queue_index = i; 2541 adapter->queue[i].rx = &adapter->rx[i]; 2542 adapter->queue[i].rx->adapter = adapter; 2543 adapter->queue[i].rx->addr = adapter->addr + TSNEP_QUEUE(i); 2544 adapter->queue[i].rx->queue_index = i; 2545 adapter->queue[i].irq_mask = 2546 irq_mask << (ECM_INT_TXRX_SHIFT * i); 2547 adapter->queue[i].irq_delay_addr = 2548 adapter->addr + ECM_INT_DELAY + ECM_INT_DELAY_OFFSET * i; 2549 retval = tsnep_set_irq_coalesce(&adapter->queue[i], 2550 TSNEP_COALESCE_USECS_DEFAULT); 2551 if (retval < 0) 2552 return retval; 2553 } 2554 2555 return 0; 2556} 2557 2558static int tsnep_probe(struct platform_device *pdev) 2559{ 2560 struct tsnep_adapter *adapter; 2561 struct net_device *netdev; 2562 struct resource *io; 2563 u32 type; 2564 int revision; 2565 int version; 2566 int queue_count; 2567 int retval; 2568 2569 netdev = devm_alloc_etherdev_mqs(&pdev->dev, 2570 sizeof(struct tsnep_adapter), 2571 TSNEP_MAX_QUEUES, TSNEP_MAX_QUEUES); 2572 if (!netdev) 2573 return -ENODEV; 2574 SET_NETDEV_DEV(netdev, &pdev->dev); 2575 adapter = netdev_priv(netdev); 2576 platform_set_drvdata(pdev, adapter); 2577 adapter->pdev = pdev; 2578 adapter->dmadev = &pdev->dev; 2579 adapter->netdev = netdev; 2580 adapter->msg_enable = NETIF_MSG_DRV | NETIF_MSG_PROBE | 2581 NETIF_MSG_LINK | NETIF_MSG_IFUP | 2582 NETIF_MSG_IFDOWN | NETIF_MSG_TX_QUEUED; 2583 2584 netdev->min_mtu = ETH_MIN_MTU; 2585 netdev->max_mtu = TSNEP_MAX_FRAME_SIZE; 2586 2587 mutex_init(&adapter->gate_control_lock); 2588 mutex_init(&adapter->rxnfc_lock); 2589 INIT_LIST_HEAD(&adapter->rxnfc_rules); 2590 2591 adapter->addr = devm_platform_get_and_ioremap_resource(pdev, 0, &io); 2592 if (IS_ERR(adapter->addr)) 2593 return PTR_ERR(adapter->addr); 2594 netdev->mem_start = io->start; 2595 netdev->mem_end = io->end; 2596 2597 type = ioread32(adapter->addr + ECM_TYPE); 2598 revision = (type & ECM_REVISION_MASK) >> ECM_REVISION_SHIFT; 2599 version = (type & ECM_VERSION_MASK) >> ECM_VERSION_SHIFT; 2600 queue_count = (type & ECM_QUEUE_COUNT_MASK) >> ECM_QUEUE_COUNT_SHIFT; 2601 adapter->gate_control = type & ECM_GATE_CONTROL; 2602 adapter->rxnfc_max = TSNEP_RX_ASSIGN_ETHER_TYPE_COUNT; 2603 2604 tsnep_disable_irq(adapter, ECM_INT_ALL); 2605 2606 retval = tsnep_queue_init(adapter, queue_count); 2607 if (retval) 2608 return retval; 2609 2610 retval = dma_set_mask_and_coherent(&adapter->pdev->dev, 2611 DMA_BIT_MASK(64)); 2612 if (retval) { 2613 dev_err(&adapter->pdev->dev, "no usable DMA configuration.\n"); 2614 return retval; 2615 } 2616 2617 retval = tsnep_mac_init(adapter); 2618 if (retval) 2619 return retval; 2620 2621 retval = tsnep_mdio_init(adapter); 2622 if (retval) 2623 goto mdio_init_failed; 2624 2625 retval = tsnep_phy_init(adapter); 2626 if (retval) 2627 goto phy_init_failed; 2628 2629 retval = tsnep_ptp_init(adapter); 2630 if (retval) 2631 goto ptp_init_failed; 2632 2633 retval = tsnep_tc_init(adapter); 2634 if (retval) 2635 goto tc_init_failed; 2636 2637 retval = tsnep_rxnfc_init(adapter); 2638 if (retval) 2639 goto rxnfc_init_failed; 2640 2641 netdev->netdev_ops = &tsnep_netdev_ops; 2642 netdev->ethtool_ops = &tsnep_ethtool_ops; 2643 netdev->features = NETIF_F_SG; 2644 netdev->hw_features = netdev->features | NETIF_F_LOOPBACK; 2645 2646 netdev->xdp_features = NETDEV_XDP_ACT_BASIC | NETDEV_XDP_ACT_REDIRECT | 2647 NETDEV_XDP_ACT_NDO_XMIT | 2648 NETDEV_XDP_ACT_NDO_XMIT_SG | 2649 NETDEV_XDP_ACT_XSK_ZEROCOPY; 2650 2651 /* carrier off reporting is important to ethtool even BEFORE open */ 2652 netif_carrier_off(netdev); 2653 2654 retval = register_netdev(netdev); 2655 if (retval) 2656 goto register_failed; 2657 2658 dev_info(&adapter->pdev->dev, "device version %d.%02d\n", version, 2659 revision); 2660 if (adapter->gate_control) 2661 dev_info(&adapter->pdev->dev, "gate control detected\n"); 2662 2663 return 0; 2664 2665register_failed: 2666 tsnep_rxnfc_cleanup(adapter); 2667rxnfc_init_failed: 2668 tsnep_tc_cleanup(adapter); 2669tc_init_failed: 2670 tsnep_ptp_cleanup(adapter); 2671ptp_init_failed: 2672phy_init_failed: 2673 if (adapter->mdiobus) 2674 mdiobus_unregister(adapter->mdiobus); 2675mdio_init_failed: 2676 return retval; 2677} 2678 2679static void tsnep_remove(struct platform_device *pdev) 2680{ 2681 struct tsnep_adapter *adapter = platform_get_drvdata(pdev); 2682 2683 unregister_netdev(adapter->netdev); 2684 2685 tsnep_rxnfc_cleanup(adapter); 2686 2687 tsnep_tc_cleanup(adapter); 2688 2689 tsnep_ptp_cleanup(adapter); 2690 2691 if (adapter->mdiobus) 2692 mdiobus_unregister(adapter->mdiobus); 2693 2694 tsnep_disable_irq(adapter, ECM_INT_ALL); 2695} 2696 2697static const struct of_device_id tsnep_of_match[] = { 2698 { .compatible = "engleder,tsnep", }, 2699{ }, 2700}; 2701MODULE_DEVICE_TABLE(of, tsnep_of_match); 2702 2703static struct platform_driver tsnep_driver = { 2704 .driver = { 2705 .name = TSNEP, 2706 .of_match_table = tsnep_of_match, 2707 }, 2708 .probe = tsnep_probe, 2709 .remove = tsnep_remove, 2710}; 2711module_platform_driver(tsnep_driver); 2712 2713MODULE_AUTHOR("Gerhard Engleder <gerhard@engleder-embedded.com>"); 2714MODULE_DESCRIPTION("TSN endpoint Ethernet MAC driver"); 2715MODULE_LICENSE("GPL");
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