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