drivers/net/ethernet/synopsys/dwc-xlgmac-net.c

   1 /* Synopsys DesignWare Core Enterprise Ethernet (XLGMAC) Driver
   2  *
   3  * Copyright (c) 2017 Synopsys, Inc. (www.synopsys.com)
   4  *
   5  * This program is dual-licensed; you may select either version 2 of
   6  * the GNU General Public License ("GPL") or BSD license ("BSD").
   7  *
   8  * This Synopsys DWC XLGMAC software driver and associated documentation
   9  * (hereinafter the "Software") is an unsupported proprietary work of
  10  * Synopsys, Inc. unless otherwise expressly agreed to in writing between
  11  * Synopsys and you. The Software IS NOT an item of Licensed Software or a
  12  * Licensed Product under any End User Software License Agreement or
  13  * Agreement for Licensed Products with Synopsys or any supplement thereto.
  14  * Synopsys is a registered trademark of Synopsys, Inc. Other names included
  15  * in the SOFTWARE may be the trademarks of their respective owners.
  16  */
  17
  18 #include <linux/netdevice.h>
  19 #include <linux/tcp.h>
  20 #include <linux/interrupt.h>
  21
  22 #include "dwc-xlgmac.h"
  23 #include "dwc-xlgmac-reg.h"
  24
  25 static int xlgmac_one_poll(struct napi_struct *, int);
  26 static int xlgmac_all_poll(struct napi_struct *, int);
  27
  28 static inline unsigned int xlgmac_tx_avail_desc(struct xlgmac_ring *ring)
  29 {
  30         return (ring->dma_desc_count - (ring->cur - ring->dirty));
  31 }
  32
  33 static inline unsigned int xlgmac_rx_dirty_desc(struct xlgmac_ring *ring)
  34 {
  35         return (ring->cur - ring->dirty);
  36 }
  37
  38 static int xlgmac_maybe_stop_tx_queue(
  39                         struct xlgmac_channel *channel,
  40                         struct xlgmac_ring *ring,
  41                         unsigned int count)
  42 {
  43         struct xlgmac_pdata *pdata = channel->pdata;
  44
  45         if (count > xlgmac_tx_avail_desc(ring)) {
  46                 netif_info(pdata, drv, pdata->netdev,
  47                            "Tx queue stopped, not enough descriptors available\n");
  48                 netif_stop_subqueue(pdata->netdev, channel->queue_index);
  49                 ring->tx.queue_stopped = 1;
  50
  51                 /* If we haven't notified the hardware because of xmit_more
  52                  * support, tell it now
  53                  */
  54                 if (ring->tx.xmit_more)
  55                         pdata->hw_ops.tx_start_xmit(channel, ring);
  56
  57                 return NETDEV_TX_BUSY;
  58         }
  59
  60         return 0;
  61 }
  62
  63 static void xlgmac_prep_vlan(struct sk_buff *skb,
  64                              struct xlgmac_pkt_info *pkt_info)
  65 {
  66         if (skb_vlan_tag_present(skb))
  67                 pkt_info->vlan_ctag = skb_vlan_tag_get(skb);
  68 }
  69
  70 static int xlgmac_prep_tso(struct sk_buff *skb,
  71                            struct xlgmac_pkt_info *pkt_info)
  72 {
  73         int ret;
  74
  75         if (!XLGMAC_GET_REG_BITS(pkt_info->attributes,
  76                                  TX_PACKET_ATTRIBUTES_TSO_ENABLE_POS,
  77                                  TX_PACKET_ATTRIBUTES_TSO_ENABLE_LEN))
  78                 return 0;
  79
  80         ret = skb_cow_head(skb, 0);
  81         if (ret)
  82                 return ret;
  83
  84         pkt_info->header_len = skb_transport_offset(skb) + tcp_hdrlen(skb);
  85         pkt_info->tcp_header_len = tcp_hdrlen(skb);
  86         pkt_info->tcp_payload_len = skb->len - pkt_info->header_len;
  87         pkt_info->mss = skb_shinfo(skb)->gso_size;
  88
  89         XLGMAC_PR("header_len=%u\n", pkt_info->header_len);
  90         XLGMAC_PR("tcp_header_len=%u, tcp_payload_len=%u\n",
  91                   pkt_info->tcp_header_len, pkt_info->tcp_payload_len);
  92         XLGMAC_PR("mss=%u\n", pkt_info->mss);
  93
  94         /* Update the number of packets that will ultimately be transmitted
  95          * along with the extra bytes for each extra packet
  96          */
  97         pkt_info->tx_packets = skb_shinfo(skb)->gso_segs;
  98         pkt_info->tx_bytes += (pkt_info->tx_packets - 1) * pkt_info->header_len;
  99
 100         return 0;
 101 }
 102
 103 static int xlgmac_is_tso(struct sk_buff *skb)
 104 {
 105         if (skb->ip_summed != CHECKSUM_PARTIAL)
 106                 return 0;
 107
 108         if (!skb_is_gso(skb))
 109                 return 0;
 110
 111         return 1;
 112 }
 113
 114 static void xlgmac_prep_tx_pkt(struct xlgmac_pdata *pdata,
 115                                struct xlgmac_ring *ring,
 116                                struct sk_buff *skb,
 117                                struct xlgmac_pkt_info *pkt_info)
 118 {
 119         struct skb_frag_struct *frag;
 120         unsigned int context_desc;
 121         unsigned int len;
 122         unsigned int i;
 123
 124         pkt_info->skb = skb;
 125
 126         context_desc = 0;
 127         pkt_info->desc_count = 0;
 128
 129         pkt_info->tx_packets = 1;
 130         pkt_info->tx_bytes = skb->len;
 131
 132         if (xlgmac_is_tso(skb)) {
 133                 /* TSO requires an extra descriptor if mss is different */
 134                 if (skb_shinfo(skb)->gso_size != ring->tx.cur_mss) {
 135                         context_desc = 1;
 136                         pkt_info->desc_count++;
 137                 }
 138
 139                 /* TSO requires an extra descriptor for TSO header */
 140                 pkt_info->desc_count++;
 141
 142                 pkt_info->attributes = XLGMAC_SET_REG_BITS(
 143                                         pkt_info->attributes,
 144                                         TX_PACKET_ATTRIBUTES_TSO_ENABLE_POS,
 145                                         TX_PACKET_ATTRIBUTES_TSO_ENABLE_LEN,
 146                                         1);
 147                 pkt_info->attributes = XLGMAC_SET_REG_BITS(
 148                                         pkt_info->attributes,
 149                                         TX_PACKET_ATTRIBUTES_CSUM_ENABLE_POS,
 150                                         TX_PACKET_ATTRIBUTES_CSUM_ENABLE_LEN,
 151                                         1);
 152         } else if (skb->ip_summed == CHECKSUM_PARTIAL)
 153                 pkt_info->attributes = XLGMAC_SET_REG_BITS(
 154                                         pkt_info->attributes,
 155                                         TX_PACKET_ATTRIBUTES_CSUM_ENABLE_POS,
 156                                         TX_PACKET_ATTRIBUTES_CSUM_ENABLE_LEN,
 157                                         1);
 158
 159         if (skb_vlan_tag_present(skb)) {
 160                 /* VLAN requires an extra descriptor if tag is different */
 161                 if (skb_vlan_tag_get(skb) != ring->tx.cur_vlan_ctag)
 162                         /* We can share with the TSO context descriptor */
 163                         if (!context_desc) {
 164                                 context_desc = 1;
 165                                 pkt_info->desc_count++;
 166                         }
 167
 168                 pkt_info->attributes = XLGMAC_SET_REG_BITS(
 169                                         pkt_info->attributes,
 170                                         TX_PACKET_ATTRIBUTES_VLAN_CTAG_POS,
 171                                         TX_PACKET_ATTRIBUTES_VLAN_CTAG_LEN,
 172                                         1);
 173         }
 174
 175         for (len = skb_headlen(skb); len;) {
 176                 pkt_info->desc_count++;
 177                 len -= min_t(unsigned int, len, XLGMAC_TX_MAX_BUF_SIZE);
 178         }
 179
 180         for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
 181                 frag = &skb_shinfo(skb)->frags[i];
 182                 for (len = skb_frag_size(frag); len; ) {
 183                         pkt_info->desc_count++;
 184                         len -= min_t(unsigned int, len, XLGMAC_TX_MAX_BUF_SIZE);
 185                 }
 186         }
 187 }
 188
 189 static int xlgmac_calc_rx_buf_size(struct net_device *netdev, unsigned int mtu)
 190 {
 191         unsigned int rx_buf_size;
 192
 193         if (mtu > XLGMAC_JUMBO_PACKET_MTU) {
 194                 netdev_alert(netdev, "MTU exceeds maximum supported value\n");
 195                 return -EINVAL;
 196         }
 197
 198         rx_buf_size = mtu + ETH_HLEN + ETH_FCS_LEN + VLAN_HLEN;
 199         rx_buf_size = clamp_val(rx_buf_size, XLGMAC_RX_MIN_BUF_SIZE, PAGE_SIZE);
 200
 201         rx_buf_size = (rx_buf_size + XLGMAC_RX_BUF_ALIGN - 1) &
 202                       ~(XLGMAC_RX_BUF_ALIGN - 1);
 203
 204         return rx_buf_size;
 205 }
 206
 207 static void xlgmac_enable_rx_tx_ints(struct xlgmac_pdata *pdata)
 208 {
 209         struct xlgmac_hw_ops *hw_ops = &pdata->hw_ops;
 210         struct xlgmac_channel *channel;
 211         enum xlgmac_int int_id;
 212         unsigned int i;
 213
 214         channel = pdata->channel_head;
 215         for (i = 0; i < pdata->channel_count; i++, channel++) {
 216                 if (channel->tx_ring && channel->rx_ring)
 217                         int_id = XLGMAC_INT_DMA_CH_SR_TI_RI;
 218                 else if (channel->tx_ring)
 219                         int_id = XLGMAC_INT_DMA_CH_SR_TI;
 220                 else if (channel->rx_ring)
 221                         int_id = XLGMAC_INT_DMA_CH_SR_RI;
 222                 else
 223                         continue;
 224
 225                 hw_ops->enable_int(channel, int_id);
 226         }
 227 }
 228
 229 static void xlgmac_disable_rx_tx_ints(struct xlgmac_pdata *pdata)
 230 {
 231         struct xlgmac_hw_ops *hw_ops = &pdata->hw_ops;
 232         struct xlgmac_channel *channel;
 233         enum xlgmac_int int_id;
 234         unsigned int i;
 235
 236         channel = pdata->channel_head;
 237         for (i = 0; i < pdata->channel_count; i++, channel++) {
 238                 if (channel->tx_ring && channel->rx_ring)
 239                         int_id = XLGMAC_INT_DMA_CH_SR_TI_RI;
 240                 else if (channel->tx_ring)
 241                         int_id = XLGMAC_INT_DMA_CH_SR_TI;
 242                 else if (channel->rx_ring)
 243                         int_id = XLGMAC_INT_DMA_CH_SR_RI;
 244                 else
 245                         continue;
 246
 247                 hw_ops->disable_int(channel, int_id);
 248         }
 249 }
 250
 251 static irqreturn_t xlgmac_isr(int irq, void *data)
 252 {
 253         unsigned int dma_isr, dma_ch_isr, mac_isr;
 254         struct xlgmac_pdata *pdata = data;
 255         struct xlgmac_channel *channel;
 256         struct xlgmac_hw_ops *hw_ops;
 257         unsigned int i, ti, ri;
 258
 259         hw_ops = &pdata->hw_ops;
 260
 261         /* The DMA interrupt status register also reports MAC and MTL
 262          * interrupts. So for polling mode, we just need to check for
 263          * this register to be non-zero
 264          */
 265         dma_isr = readl(pdata->mac_regs + DMA_ISR);
 266         if (!dma_isr)
 267                 return IRQ_HANDLED;
 268
 269         netif_dbg(pdata, intr, pdata->netdev, "DMA_ISR=%#010x\n", dma_isr);
 270
 271         for (i = 0; i < pdata->channel_count; i++) {
 272                 if (!(dma_isr & (1 << i)))
 273                         continue;
 274
 275                 channel = pdata->channel_head + i;
 276
 277                 dma_ch_isr = readl(XLGMAC_DMA_REG(channel, DMA_CH_SR));
 278                 netif_dbg(pdata, intr, pdata->netdev, "DMA_CH%u_ISR=%#010x\n",
 279                           i, dma_ch_isr);
 280
 281                 /* The TI or RI interrupt bits may still be set even if using
 282                  * per channel DMA interrupts. Check to be sure those are not
 283                  * enabled before using the private data napi structure.
 284                  */
 285                 ti = XLGMAC_GET_REG_BITS(dma_ch_isr, DMA_CH_SR_TI_POS,
 286                                          DMA_CH_SR_TI_LEN);
 287                 ri = XLGMAC_GET_REG_BITS(dma_ch_isr, DMA_CH_SR_RI_POS,
 288                                          DMA_CH_SR_RI_LEN);
 289                 if (!pdata->per_channel_irq && (ti || ri)) {
 290                         if (napi_schedule_prep(&pdata->napi)) {
 291                                 /* Disable Tx and Rx interrupts */
 292                                 xlgmac_disable_rx_tx_ints(pdata);
 293
 294                                 pdata->stats.napi_poll_isr++;
 295                                 /* Turn on polling */
 296                                 __napi_schedule_irqoff(&pdata->napi);
 297                         }
 298                 }
 299
 300                 if (XLGMAC_GET_REG_BITS(dma_ch_isr, DMA_CH_SR_TPS_POS,
 301                                         DMA_CH_SR_TPS_LEN))
 302                         pdata->stats.tx_process_stopped++;
 303
 304                 if (XLGMAC_GET_REG_BITS(dma_ch_isr, DMA_CH_SR_RPS_POS,
 305                                         DMA_CH_SR_RPS_LEN))
 306                         pdata->stats.rx_process_stopped++;
 307
 308                 if (XLGMAC_GET_REG_BITS(dma_ch_isr, DMA_CH_SR_TBU_POS,
 309                                         DMA_CH_SR_TBU_LEN))
 310                         pdata->stats.tx_buffer_unavailable++;
 311
 312                 if (XLGMAC_GET_REG_BITS(dma_ch_isr, DMA_CH_SR_RBU_POS,
 313                                         DMA_CH_SR_RBU_LEN))
 314                         pdata->stats.rx_buffer_unavailable++;
 315
 316                 /* Restart the device on a Fatal Bus Error */
 317                 if (XLGMAC_GET_REG_BITS(dma_ch_isr, DMA_CH_SR_FBE_POS,
 318                                         DMA_CH_SR_FBE_LEN)) {
 319                         pdata->stats.fatal_bus_error++;
 320                         schedule_work(&pdata->restart_work);
 321                 }
 322
 323                 /* Clear all interrupt signals */
 324                 writel(dma_ch_isr, XLGMAC_DMA_REG(channel, DMA_CH_SR));
 325         }
 326
 327         if (XLGMAC_GET_REG_BITS(dma_isr, DMA_ISR_MACIS_POS,
 328                                 DMA_ISR_MACIS_LEN)) {
 329                 mac_isr = readl(pdata->mac_regs + MAC_ISR);
 330
 331                 if (XLGMAC_GET_REG_BITS(mac_isr, MAC_ISR_MMCTXIS_POS,
 332                                         MAC_ISR_MMCTXIS_LEN))
 333                         hw_ops->tx_mmc_int(pdata);
 334
 335                 if (XLGMAC_GET_REG_BITS(mac_isr, MAC_ISR_MMCRXIS_POS,
 336                                         MAC_ISR_MMCRXIS_LEN))
 337                         hw_ops->rx_mmc_int(pdata);
 338         }
 339
 340         return IRQ_HANDLED;
 341 }
 342
 343 static irqreturn_t xlgmac_dma_isr(int irq, void *data)
 344 {
 345         struct xlgmac_channel *channel = data;
 346
 347         /* Per channel DMA interrupts are enabled, so we use the per
 348          * channel napi structure and not the private data napi structure
 349          */
 350         if (napi_schedule_prep(&channel->napi)) {
 351                 /* Disable Tx and Rx interrupts */
 352                 disable_irq_nosync(channel->dma_irq);
 353
 354                 /* Turn on polling */
 355                 __napi_schedule_irqoff(&channel->napi);
 356         }
 357
 358         return IRQ_HANDLED;
 359 }
 360
 361 static void xlgmac_tx_timer(struct timer_list *t)
 362 {
 363         struct xlgmac_channel *channel = from_timer(channel, t, tx_timer);
 364         struct xlgmac_pdata *pdata = channel->pdata;
 365         struct napi_struct *napi;
 366
 367         napi = (pdata->per_channel_irq) ? &channel->napi : &pdata->napi;
 368
 369         if (napi_schedule_prep(napi)) {
 370                 /* Disable Tx and Rx interrupts */
 371                 if (pdata->per_channel_irq)
 372                         disable_irq_nosync(channel->dma_irq);
 373                 else
 374                         xlgmac_disable_rx_tx_ints(pdata);
 375
 376                 pdata->stats.napi_poll_txtimer++;
 377                 /* Turn on polling */
 378                 __napi_schedule(napi);
 379         }
 380
 381         channel->tx_timer_active = 0;
 382 }
 383
 384 static void xlgmac_init_timers(struct xlgmac_pdata *pdata)
 385 {
 386         struct xlgmac_channel *channel;
 387         unsigned int i;
 388
 389         channel = pdata->channel_head;
 390         for (i = 0; i < pdata->channel_count; i++, channel++) {
 391                 if (!channel->tx_ring)
 392                         break;
 393
 394                 timer_setup(&channel->tx_timer, xlgmac_tx_timer, 0);
 395         }
 396 }
 397
 398 static void xlgmac_stop_timers(struct xlgmac_pdata *pdata)
 399 {
 400         struct xlgmac_channel *channel;
 401         unsigned int i;
 402
 403         channel = pdata->channel_head;
 404         for (i = 0; i < pdata->channel_count; i++, channel++) {
 405                 if (!channel->tx_ring)
 406                         break;
 407
 408                 del_timer_sync(&channel->tx_timer);
 409         }
 410 }
 411
 412 static void xlgmac_napi_enable(struct xlgmac_pdata *pdata, unsigned int add)
 413 {
 414         struct xlgmac_channel *channel;
 415         unsigned int i;
 416
 417         if (pdata->per_channel_irq) {
 418                 channel = pdata->channel_head;
 419                 for (i = 0; i < pdata->channel_count; i++, channel++) {
 420                         if (add)
 421                                 netif_napi_add(pdata->netdev, &channel->napi,
 422                                                xlgmac_one_poll,
 423                                                NAPI_POLL_WEIGHT);
 424
 425                         napi_enable(&channel->napi);
 426                 }
 427         } else {
 428                 if (add)
 429                         netif_napi_add(pdata->netdev, &pdata->napi,
 430                                        xlgmac_all_poll, NAPI_POLL_WEIGHT);
 431
 432                 napi_enable(&pdata->napi);
 433         }
 434 }
 435
 436 static void xlgmac_napi_disable(struct xlgmac_pdata *pdata, unsigned int del)
 437 {
 438         struct xlgmac_channel *channel;
 439         unsigned int i;
 440
 441         if (pdata->per_channel_irq) {
 442                 channel = pdata->channel_head;
 443                 for (i = 0; i < pdata->channel_count; i++, channel++) {
 444                         napi_disable(&channel->napi);
 445
 446                         if (del)
 447                                 netif_napi_del(&channel->napi);
 448                 }
 449         } else {
 450                 napi_disable(&pdata->napi);
 451
 452                 if (del)
 453                         netif_napi_del(&pdata->napi);
 454         }
 455 }
 456
 457 static int xlgmac_request_irqs(struct xlgmac_pdata *pdata)
 458 {
 459         struct net_device *netdev = pdata->netdev;
 460         struct xlgmac_channel *channel;
 461         unsigned int i;
 462         int ret;
 463
 464         ret = devm_request_irq(pdata->dev, pdata->dev_irq, xlgmac_isr,
 465                                IRQF_SHARED, netdev->name, pdata);
 466         if (ret) {
 467                 netdev_alert(netdev, "error requesting irq %d\n",
 468                              pdata->dev_irq);
 469                 return ret;
 470         }
 471
 472         if (!pdata->per_channel_irq)
 473                 return 0;
 474
 475         channel = pdata->channel_head;
 476         for (i = 0; i < pdata->channel_count; i++, channel++) {
 477                 snprintf(channel->dma_irq_name,
 478                          sizeof(channel->dma_irq_name) - 1,
 479                          "%s-TxRx-%u", netdev_name(netdev),
 480                          channel->queue_index);
 481
 482                 ret = devm_request_irq(pdata->dev, channel->dma_irq,
 483                                        xlgmac_dma_isr, 0,
 484                                        channel->dma_irq_name, channel);
 485                 if (ret) {
 486                         netdev_alert(netdev, "error requesting irq %d\n",
 487                                      channel->dma_irq);
 488                         goto err_irq;
 489                 }
 490         }
 491
 492         return 0;
 493
 494 err_irq:
 495         /* Using an unsigned int, 'i' will go to UINT_MAX and exit */
 496         for (i--, channel--; i < pdata->channel_count; i--, channel--)
 497                 devm_free_irq(pdata->dev, channel->dma_irq, channel);
 498
 499         devm_free_irq(pdata->dev, pdata->dev_irq, pdata);
 500
 501         return ret;
 502 }
 503
 504 static void xlgmac_free_irqs(struct xlgmac_pdata *pdata)
 505 {
 506         struct xlgmac_channel *channel;
 507         unsigned int i;
 508
 509         devm_free_irq(pdata->dev, pdata->dev_irq, pdata);
 510
 511         if (!pdata->per_channel_irq)
 512                 return;
 513
 514         channel = pdata->channel_head;
 515         for (i = 0; i < pdata->channel_count; i++, channel++)
 516                 devm_free_irq(pdata->dev, channel->dma_irq, channel);
 517 }
 518
 519 static void xlgmac_free_tx_data(struct xlgmac_pdata *pdata)
 520 {
 521         struct xlgmac_desc_ops *desc_ops = &pdata->desc_ops;
 522         struct xlgmac_desc_data *desc_data;
 523         struct xlgmac_channel *channel;
 524         struct xlgmac_ring *ring;
 525         unsigned int i, j;
 526
 527         channel = pdata->channel_head;
 528         for (i = 0; i < pdata->channel_count; i++, channel++) {
 529                 ring = channel->tx_ring;
 530                 if (!ring)
 531                         break;
 532
 533                 for (j = 0; j < ring->dma_desc_count; j++) {
 534                         desc_data = XLGMAC_GET_DESC_DATA(ring, j);
 535                         desc_ops->unmap_desc_data(pdata, desc_data);
 536                 }
 537         }
 538 }
 539
 540 static void xlgmac_free_rx_data(struct xlgmac_pdata *pdata)
 541 {
 542         struct xlgmac_desc_ops *desc_ops = &pdata->desc_ops;
 543         struct xlgmac_desc_data *desc_data;
 544         struct xlgmac_channel *channel;
 545         struct xlgmac_ring *ring;
 546         unsigned int i, j;
 547
 548         channel = pdata->channel_head;
 549         for (i = 0; i < pdata->channel_count; i++, channel++) {
 550                 ring = channel->rx_ring;
 551                 if (!ring)
 552                         break;
 553
 554                 for (j = 0; j < ring->dma_desc_count; j++) {
 555                         desc_data = XLGMAC_GET_DESC_DATA(ring, j);
 556                         desc_ops->unmap_desc_data(pdata, desc_data);
 557                 }
 558         }
 559 }
 560
 561 static int xlgmac_start(struct xlgmac_pdata *pdata)
 562 {
 563         struct xlgmac_hw_ops *hw_ops = &pdata->hw_ops;
 564         struct net_device *netdev = pdata->netdev;
 565         int ret;
 566
 567         hw_ops->init(pdata);
 568         xlgmac_napi_enable(pdata, 1);
 569
 570         ret = xlgmac_request_irqs(pdata);
 571         if (ret)
 572                 goto err_napi;
 573
 574         hw_ops->enable_tx(pdata);
 575         hw_ops->enable_rx(pdata);
 576         netif_tx_start_all_queues(netdev);
 577
 578         return 0;
 579
 580 err_napi:
 581         xlgmac_napi_disable(pdata, 1);
 582         hw_ops->exit(pdata);
 583
 584         return ret;
 585 }
 586
 587 static void xlgmac_stop(struct xlgmac_pdata *pdata)
 588 {
 589         struct xlgmac_hw_ops *hw_ops = &pdata->hw_ops;
 590         struct net_device *netdev = pdata->netdev;
 591         struct xlgmac_channel *channel;
 592         struct netdev_queue *txq;
 593         unsigned int i;
 594
 595         netif_tx_stop_all_queues(netdev);
 596         xlgmac_stop_timers(pdata);
 597         hw_ops->disable_tx(pdata);
 598         hw_ops->disable_rx(pdata);
 599         xlgmac_free_irqs(pdata);
 600         xlgmac_napi_disable(pdata, 1);
 601         hw_ops->exit(pdata);
 602
 603         channel = pdata->channel_head;
 604         for (i = 0; i < pdata->channel_count; i++, channel++) {
 605                 if (!channel->tx_ring)
 606                         continue;
 607
 608                 txq = netdev_get_tx_queue(netdev, channel->queue_index);
 609                 netdev_tx_reset_queue(txq);
 610         }
 611 }
 612
 613 static void xlgmac_restart_dev(struct xlgmac_pdata *pdata)
 614 {
 615         /* If not running, "restart" will happen on open */
 616         if (!netif_running(pdata->netdev))
 617                 return;
 618
 619         xlgmac_stop(pdata);
 620
 621         xlgmac_free_tx_data(pdata);
 622         xlgmac_free_rx_data(pdata);
 623
 624         xlgmac_start(pdata);
 625 }
 626
 627 static void xlgmac_restart(struct work_struct *work)
 628 {
 629         struct xlgmac_pdata *pdata = container_of(work,
 630                                                    struct xlgmac_pdata,
 631                                                    restart_work);
 632
 633         rtnl_lock();
 634
 635         xlgmac_restart_dev(pdata);
 636
 637         rtnl_unlock();
 638 }
 639
 640 static int xlgmac_open(struct net_device *netdev)
 641 {
 642         struct xlgmac_pdata *pdata = netdev_priv(netdev);
 643         struct xlgmac_desc_ops *desc_ops;
 644         int ret;
 645
 646         desc_ops = &pdata->desc_ops;
 647
 648         /* TODO: Initialize the phy */
 649
 650         /* Calculate the Rx buffer size before allocating rings */
 651         ret = xlgmac_calc_rx_buf_size(netdev, netdev->mtu);
 652         if (ret < 0)
 653                 return ret;
 654         pdata->rx_buf_size = ret;
 655
 656         /* Allocate the channels and rings */
 657         ret = desc_ops->alloc_channles_and_rings(pdata);
 658         if (ret)
 659                 return ret;
 660
 661         INIT_WORK(&pdata->restart_work, xlgmac_restart);
 662         xlgmac_init_timers(pdata);
 663
 664         ret = xlgmac_start(pdata);
 665         if (ret)
 666                 goto err_channels_and_rings;
 667
 668         return 0;
 669
 670 err_channels_and_rings:
 671         desc_ops->free_channels_and_rings(pdata);
 672
 673         return ret;
 674 }
 675
 676 static int xlgmac_close(struct net_device *netdev)
 677 {
 678         struct xlgmac_pdata *pdata = netdev_priv(netdev);
 679         struct xlgmac_desc_ops *desc_ops;
 680
 681         desc_ops = &pdata->desc_ops;
 682
 683         /* Stop the device */
 684         xlgmac_stop(pdata);
 685
 686         /* Free the channels and rings */
 687         desc_ops->free_channels_and_rings(pdata);
 688
 689         return 0;
 690 }
 691
 692 static void xlgmac_tx_timeout(struct net_device *netdev)
 693 {
 694         struct xlgmac_pdata *pdata = netdev_priv(netdev);
 695
 696         netdev_warn(netdev, "tx timeout, device restarting\n");
 697         schedule_work(&pdata->restart_work);
 698 }
 699
 700 static int xlgmac_xmit(struct sk_buff *skb, struct net_device *netdev)
 701 {
 702         struct xlgmac_pdata *pdata = netdev_priv(netdev);
 703         struct xlgmac_pkt_info *tx_pkt_info;
 704         struct xlgmac_desc_ops *desc_ops;
 705         struct xlgmac_channel *channel;
 706         struct xlgmac_hw_ops *hw_ops;
 707         struct netdev_queue *txq;
 708         struct xlgmac_ring *ring;
 709         int ret;
 710
 711         desc_ops = &pdata->desc_ops;
 712         hw_ops = &pdata->hw_ops;
 713
 714         XLGMAC_PR("skb->len = %d\n", skb->len);
 715
 716         channel = pdata->channel_head + skb->queue_mapping;
 717         txq = netdev_get_tx_queue(netdev, channel->queue_index);
 718         ring = channel->tx_ring;
 719         tx_pkt_info = &ring->pkt_info;
 720
 721         if (skb->len == 0) {
 722                 netif_err(pdata, tx_err, netdev,
 723                           "empty skb received from stack\n");
 724                 dev_kfree_skb_any(skb);
 725                 return NETDEV_TX_OK;
 726         }
 727
 728         /* Prepare preliminary packet info for TX */
 729         memset(tx_pkt_info, 0, sizeof(*tx_pkt_info));
 730         xlgmac_prep_tx_pkt(pdata, ring, skb, tx_pkt_info);
 731
 732         /* Check that there are enough descriptors available */
 733         ret = xlgmac_maybe_stop_tx_queue(channel, ring,
 734                                          tx_pkt_info->desc_count);
 735         if (ret)
 736                 return ret;
 737
 738         ret = xlgmac_prep_tso(skb, tx_pkt_info);
 739         if (ret) {
 740                 netif_err(pdata, tx_err, netdev,
 741                           "error processing TSO packet\n");
 742                 dev_kfree_skb_any(skb);
 743                 return ret;
 744         }
 745         xlgmac_prep_vlan(skb, tx_pkt_info);
 746
 747         if (!desc_ops->map_tx_skb(channel, skb)) {
 748                 dev_kfree_skb_any(skb);
 749                 return NETDEV_TX_OK;
 750         }
 751
 752         /* Report on the actual number of bytes (to be) sent */
 753         netdev_tx_sent_queue(txq, tx_pkt_info->tx_bytes);
 754
 755         /* Configure required descriptor fields for transmission */
 756         hw_ops->dev_xmit(channel);
 757
 758         if (netif_msg_pktdata(pdata))
 759                 xlgmac_print_pkt(netdev, skb, true);
 760
 761         /* Stop the queue in advance if there may not be enough descriptors */
 762         xlgmac_maybe_stop_tx_queue(channel, ring, XLGMAC_TX_MAX_DESC_NR);
 763
 764         return NETDEV_TX_OK;
 765 }
 766
 767 static void xlgmac_get_stats64(struct net_device *netdev,
 768                                struct rtnl_link_stats64 *s)
 769 {
 770         struct xlgmac_pdata *pdata = netdev_priv(netdev);
 771         struct xlgmac_stats *pstats = &pdata->stats;
 772
 773         pdata->hw_ops.read_mmc_stats(pdata);
 774
 775         s->rx_packets = pstats->rxframecount_gb;
 776         s->rx_bytes = pstats->rxoctetcount_gb;
 777         s->rx_errors = pstats->rxframecount_gb -
 778                        pstats->rxbroadcastframes_g -
 779                        pstats->rxmulticastframes_g -
 780                        pstats->rxunicastframes_g;
 781         s->multicast = pstats->rxmulticastframes_g;
 782         s->rx_length_errors = pstats->rxlengtherror;
 783         s->rx_crc_errors = pstats->rxcrcerror;
 784         s->rx_fifo_errors = pstats->rxfifooverflow;
 785
 786         s->tx_packets = pstats->txframecount_gb;
 787         s->tx_bytes = pstats->txoctetcount_gb;
 788         s->tx_errors = pstats->txframecount_gb - pstats->txframecount_g;
 789         s->tx_dropped = netdev->stats.tx_dropped;
 790 }
 791
 792 static int xlgmac_set_mac_address(struct net_device *netdev, void *addr)
 793 {
 794         struct xlgmac_pdata *pdata = netdev_priv(netdev);
 795         struct xlgmac_hw_ops *hw_ops = &pdata->hw_ops;
 796         struct sockaddr *saddr = addr;
 797
 798         if (!is_valid_ether_addr(saddr->sa_data))
 799                 return -EADDRNOTAVAIL;
 800
 801         memcpy(netdev->dev_addr, saddr->sa_data, netdev->addr_len);
 802
 803         hw_ops->set_mac_address(pdata, netdev->dev_addr);
 804
 805         return 0;
 806 }
 807
 808 static int xlgmac_ioctl(struct net_device *netdev,
 809                         struct ifreq *ifreq, int cmd)
 810 {
 811         if (!netif_running(netdev))
 812                 return -ENODEV;
 813
 814         return 0;
 815 }
 816
 817 static int xlgmac_change_mtu(struct net_device *netdev, int mtu)
 818 {
 819         struct xlgmac_pdata *pdata = netdev_priv(netdev);
 820         int ret;
 821
 822         ret = xlgmac_calc_rx_buf_size(netdev, mtu);
 823         if (ret < 0)
 824                 return ret;
 825
 826         pdata->rx_buf_size = ret;
 827         netdev->mtu = mtu;
 828
 829         xlgmac_restart_dev(pdata);
 830
 831         return 0;
 832 }
 833
 834 static int xlgmac_vlan_rx_add_vid(struct net_device *netdev,
 835                                   __be16 proto,
 836                                   u16 vid)
 837 {
 838         struct xlgmac_pdata *pdata = netdev_priv(netdev);
 839         struct xlgmac_hw_ops *hw_ops = &pdata->hw_ops;
 840
 841         set_bit(vid, pdata->active_vlans);
 842         hw_ops->update_vlan_hash_table(pdata);
 843
 844         return 0;
 845 }
 846
 847 static int xlgmac_vlan_rx_kill_vid(struct net_device *netdev,
 848                                    __be16 proto,
 849                                    u16 vid)
 850 {
 851         struct xlgmac_pdata *pdata = netdev_priv(netdev);
 852         struct xlgmac_hw_ops *hw_ops = &pdata->hw_ops;
 853
 854         clear_bit(vid, pdata->active_vlans);
 855         hw_ops->update_vlan_hash_table(pdata);
 856
 857         return 0;
 858 }
 859
 860 #ifdef CONFIG_NET_POLL_CONTROLLER
 861 static void xlgmac_poll_controller(struct net_device *netdev)
 862 {
 863         struct xlgmac_pdata *pdata = netdev_priv(netdev);
 864         struct xlgmac_channel *channel;
 865         unsigned int i;
 866
 867         if (pdata->per_channel_irq) {
 868                 channel = pdata->channel_head;
 869                 for (i = 0; i < pdata->channel_count; i++, channel++)
 870                         xlgmac_dma_isr(channel->dma_irq, channel);
 871         } else {
 872                 disable_irq(pdata->dev_irq);
 873                 xlgmac_isr(pdata->dev_irq, pdata);
 874                 enable_irq(pdata->dev_irq);
 875         }
 876 }
 877 #endif /* CONFIG_NET_POLL_CONTROLLER */
 878
 879 static int xlgmac_set_features(struct net_device *netdev,
 880                                netdev_features_t features)
 881 {
 882         netdev_features_t rxhash, rxcsum, rxvlan, rxvlan_filter;
 883         struct xlgmac_pdata *pdata = netdev_priv(netdev);
 884         struct xlgmac_hw_ops *hw_ops = &pdata->hw_ops;
 885         int ret = 0;
 886
 887         rxhash = pdata->netdev_features & NETIF_F_RXHASH;
 888         rxcsum = pdata->netdev_features & NETIF_F_RXCSUM;
 889         rxvlan = pdata->netdev_features & NETIF_F_HW_VLAN_CTAG_RX;
 890         rxvlan_filter = pdata->netdev_features & NETIF_F_HW_VLAN_CTAG_FILTER;
 891
 892         if ((features & NETIF_F_RXHASH) && !rxhash)
 893                 ret = hw_ops->enable_rss(pdata);
 894         else if (!(features & NETIF_F_RXHASH) && rxhash)
 895                 ret = hw_ops->disable_rss(pdata);
 896         if (ret)
 897                 return ret;
 898
 899         if ((features & NETIF_F_RXCSUM) && !rxcsum)
 900                 hw_ops->enable_rx_csum(pdata);
 901         else if (!(features & NETIF_F_RXCSUM) && rxcsum)
 902                 hw_ops->disable_rx_csum(pdata);
 903
 904         if ((features & NETIF_F_HW_VLAN_CTAG_RX) && !rxvlan)
 905                 hw_ops->enable_rx_vlan_stripping(pdata);
 906         else if (!(features & NETIF_F_HW_VLAN_CTAG_RX) && rxvlan)
 907                 hw_ops->disable_rx_vlan_stripping(pdata);
 908
 909         if ((features & NETIF_F_HW_VLAN_CTAG_FILTER) && !rxvlan_filter)
 910                 hw_ops->enable_rx_vlan_filtering(pdata);
 911         else if (!(features & NETIF_F_HW_VLAN_CTAG_FILTER) && rxvlan_filter)
 912                 hw_ops->disable_rx_vlan_filtering(pdata);
 913
 914         pdata->netdev_features = features;
 915
 916         return 0;
 917 }
 918
 919 static void xlgmac_set_rx_mode(struct net_device *netdev)
 920 {
 921         struct xlgmac_pdata *pdata = netdev_priv(netdev);
 922         struct xlgmac_hw_ops *hw_ops = &pdata->hw_ops;
 923
 924         hw_ops->config_rx_mode(pdata);
 925 }
 926
 927 static const struct net_device_ops xlgmac_netdev_ops = {
 928         .ndo_open               = xlgmac_open,
 929         .ndo_stop               = xlgmac_close,
 930         .ndo_start_xmit         = xlgmac_xmit,
 931         .ndo_tx_timeout         = xlgmac_tx_timeout,
 932         .ndo_get_stats64        = xlgmac_get_stats64,
 933         .ndo_change_mtu         = xlgmac_change_mtu,
 934         .ndo_set_mac_address    = xlgmac_set_mac_address,
 935         .ndo_validate_addr      = eth_validate_addr,
 936         .ndo_do_ioctl           = xlgmac_ioctl,
 937         .ndo_vlan_rx_add_vid    = xlgmac_vlan_rx_add_vid,
 938         .ndo_vlan_rx_kill_vid   = xlgmac_vlan_rx_kill_vid,
 939 #ifdef CONFIG_NET_POLL_CONTROLLER
 940         .ndo_poll_controller    = xlgmac_poll_controller,
 941 #endif
 942         .ndo_set_features       = xlgmac_set_features,
 943         .ndo_set_rx_mode        = xlgmac_set_rx_mode,
 944 };
 945
 946 const struct net_device_ops *xlgmac_get_netdev_ops(void)
 947 {
 948         return &xlgmac_netdev_ops;
 949 }
 950
 951 static void xlgmac_rx_refresh(struct xlgmac_channel *channel)
 952 {
 953         struct xlgmac_pdata *pdata = channel->pdata;
 954         struct xlgmac_ring *ring = channel->rx_ring;
 955         struct xlgmac_desc_data *desc_data;
 956         struct xlgmac_desc_ops *desc_ops;
 957         struct xlgmac_hw_ops *hw_ops;
 958
 959         desc_ops = &pdata->desc_ops;
 960         hw_ops = &pdata->hw_ops;
 961
 962         while (ring->dirty != ring->cur) {
 963                 desc_data = XLGMAC_GET_DESC_DATA(ring, ring->dirty);
 964
 965                 /* Reset desc_data values */
 966                 desc_ops->unmap_desc_data(pdata, desc_data);
 967
 968                 if (desc_ops->map_rx_buffer(pdata, ring, desc_data))
 969                         break;
 970
 971                 hw_ops->rx_desc_reset(pdata, desc_data, ring->dirty);
 972
 973                 ring->dirty++;
 974         }
 975
 976         /* Make sure everything is written before the register write */
 977         wmb();
 978
 979         /* Update the Rx Tail Pointer Register with address of
 980          * the last cleaned entry
 981          */
 982         desc_data = XLGMAC_GET_DESC_DATA(ring, ring->dirty - 1);
 983         writel(lower_32_bits(desc_data->dma_desc_addr),
 984                XLGMAC_DMA_REG(channel, DMA_CH_RDTR_LO));
 985 }
 986
 987 static struct sk_buff *xlgmac_create_skb(struct xlgmac_pdata *pdata,
 988                                          struct napi_struct *napi,
 989                                          struct xlgmac_desc_data *desc_data,
 990                                          unsigned int len)
 991 {
 992         unsigned int copy_len;
 993         struct sk_buff *skb;
 994         u8 *packet;
 995
 996         skb = napi_alloc_skb(napi, desc_data->rx.hdr.dma_len);
 997         if (!skb)
 998                 return NULL;
 999
1000         /* Start with the header buffer which may contain just the header
1001          * or the header plus data
1002          */
1003         dma_sync_single_range_for_cpu(pdata->dev, desc_data->rx.hdr.dma_base,
1004                                       desc_data->rx.hdr.dma_off,
1005                                       desc_data->rx.hdr.dma_len,
1006                                       DMA_FROM_DEVICE);
1007
1008         packet = page_address(desc_data->rx.hdr.pa.pages) +
1009                  desc_data->rx.hdr.pa.pages_offset;
1010         copy_len = (desc_data->rx.hdr_len) ? desc_data->rx.hdr_len : len;
1011         copy_len = min(desc_data->rx.hdr.dma_len, copy_len);
1012         skb_copy_to_linear_data(skb, packet, copy_len);
1013         skb_put(skb, copy_len);
1014
1015         len -= copy_len;
1016         if (len) {
1017                 /* Add the remaining data as a frag */
1018                 dma_sync_single_range_for_cpu(pdata->dev,
1019                                               desc_data->rx.buf.dma_base,
1020                                               desc_data->rx.buf.dma_off,
1021                                               desc_data->rx.buf.dma_len,
1022                                               DMA_FROM_DEVICE);
1023
1024                 skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags,
1025                                 desc_data->rx.buf.pa.pages,
1026                                 desc_data->rx.buf.pa.pages_offset,
1027                                 len, desc_data->rx.buf.dma_len);
1028                 desc_data->rx.buf.pa.pages = NULL;
1029         }
1030
1031         return skb;
1032 }
1033
1034 static int xlgmac_tx_poll(struct xlgmac_channel *channel)
1035 {
1036         struct xlgmac_pdata *pdata = channel->pdata;
1037         struct xlgmac_ring *ring = channel->tx_ring;
1038         struct net_device *netdev = pdata->netdev;
1039         unsigned int tx_packets = 0, tx_bytes = 0;
1040         struct xlgmac_desc_data *desc_data;
1041         struct xlgmac_dma_desc *dma_desc;
1042         struct xlgmac_desc_ops *desc_ops;
1043         struct xlgmac_hw_ops *hw_ops;
1044         struct netdev_queue *txq;
1045         int processed = 0;
1046         unsigned int cur;
1047
1048         desc_ops = &pdata->desc_ops;
1049         hw_ops = &pdata->hw_ops;
1050
1051         /* Nothing to do if there isn't a Tx ring for this channel */
1052         if (!ring)
1053                 return 0;
1054
1055         cur = ring->cur;
1056
1057         /* Be sure we get ring->cur before accessing descriptor data */
1058         smp_rmb();
1059
1060         txq = netdev_get_tx_queue(netdev, channel->queue_index);
1061
1062         while ((processed < XLGMAC_TX_DESC_MAX_PROC) &&
1063                (ring->dirty != cur)) {
1064                 desc_data = XLGMAC_GET_DESC_DATA(ring, ring->dirty);
1065                 dma_desc = desc_data->dma_desc;
1066
1067                 if (!hw_ops->tx_complete(dma_desc))
1068                         break;
1069
1070                 /* Make sure descriptor fields are read after reading
1071                  * the OWN bit
1072                  */
1073                 dma_rmb();
1074
1075                 if (netif_msg_tx_done(pdata))
1076                         xlgmac_dump_tx_desc(pdata, ring, ring->dirty, 1, 0);
1077
1078                 if (hw_ops->is_last_desc(dma_desc)) {
1079                         tx_packets += desc_data->tx.packets;
1080                         tx_bytes += desc_data->tx.bytes;
1081                 }
1082
1083                 /* Free the SKB and reset the descriptor for re-use */
1084                 desc_ops->unmap_desc_data(pdata, desc_data);
1085                 hw_ops->tx_desc_reset(desc_data);
1086
1087                 processed++;
1088                 ring->dirty++;
1089         }
1090
1091         if (!processed)
1092                 return 0;
1093
1094         netdev_tx_completed_queue(txq, tx_packets, tx_bytes);
1095
1096         if ((ring->tx.queue_stopped == 1) &&
1097             (xlgmac_tx_avail_desc(ring) > XLGMAC_TX_DESC_MIN_FREE)) {
1098                 ring->tx.queue_stopped = 0;
1099                 netif_tx_wake_queue(txq);
1100         }
1101
1102         XLGMAC_PR("processed=%d\n", processed);
1103
1104         return processed;
1105 }
1106
1107 static int xlgmac_rx_poll(struct xlgmac_channel *channel, int budget)
1108 {
1109         struct xlgmac_pdata *pdata = channel->pdata;
1110         struct xlgmac_ring *ring = channel->rx_ring;
1111         struct net_device *netdev = pdata->netdev;
1112         unsigned int len, dma_desc_len, max_len;
1113         unsigned int context_next, context;
1114         struct xlgmac_desc_data *desc_data;
1115         struct xlgmac_pkt_info *pkt_info;
1116         unsigned int incomplete, error;
1117         struct xlgmac_hw_ops *hw_ops;
1118         unsigned int received = 0;
1119         struct napi_struct *napi;
1120         struct sk_buff *skb;
1121         int packet_count = 0;
1122
1123         hw_ops = &pdata->hw_ops;
1124
1125         /* Nothing to do if there isn't a Rx ring for this channel */
1126         if (!ring)
1127                 return 0;
1128
1129         incomplete = 0;
1130         context_next = 0;
1131
1132         napi = (pdata->per_channel_irq) ? &channel->napi : &pdata->napi;
1133
1134         desc_data = XLGMAC_GET_DESC_DATA(ring, ring->cur);
1135         pkt_info = &ring->pkt_info;
1136         while (packet_count < budget) {
1137                 /* First time in loop see if we need to restore state */
1138                 if (!received && desc_data->state_saved) {
1139                         skb = desc_data->state.skb;
1140                         error = desc_data->state.error;
1141                         len = desc_data->state.len;
1142                 } else {
1143                         memset(pkt_info, 0, sizeof(*pkt_info));
1144                         skb = NULL;
1145                         error = 0;
1146                         len = 0;
1147                 }
1148
1149 read_again:
1150                 desc_data = XLGMAC_GET_DESC_DATA(ring, ring->cur);
1151
1152                 if (xlgmac_rx_dirty_desc(ring) > XLGMAC_RX_DESC_MAX_DIRTY)
1153                         xlgmac_rx_refresh(channel);
1154
1155                 if (hw_ops->dev_read(channel))
1156                         break;
1157
1158                 received++;
1159                 ring->cur++;
1160
1161                 incomplete = XLGMAC_GET_REG_BITS(
1162                                         pkt_info->attributes,
1163                                         RX_PACKET_ATTRIBUTES_INCOMPLETE_POS,
1164                                         RX_PACKET_ATTRIBUTES_INCOMPLETE_LEN);
1165                 context_next = XLGMAC_GET_REG_BITS(
1166                                         pkt_info->attributes,
1167                                         RX_PACKET_ATTRIBUTES_CONTEXT_NEXT_POS,
1168                                         RX_PACKET_ATTRIBUTES_CONTEXT_NEXT_LEN);
1169                 context = XLGMAC_GET_REG_BITS(
1170                                         pkt_info->attributes,
1171                                         RX_PACKET_ATTRIBUTES_CONTEXT_POS,
1172                                         RX_PACKET_ATTRIBUTES_CONTEXT_LEN);
1173
1174                 /* Earlier error, just drain the remaining data */
1175                 if ((incomplete || context_next) && error)
1176                         goto read_again;
1177
1178                 if (error || pkt_info->errors) {
1179                         if (pkt_info->errors)
1180                                 netif_err(pdata, rx_err, netdev,
1181                                           "error in received packet\n");
1182                         dev_kfree_skb(skb);
1183                         goto next_packet;
1184                 }
1185
1186                 if (!context) {
1187                         /* Length is cumulative, get this descriptor's length */
1188                         dma_desc_len = desc_data->rx.len - len;
1189                         len += dma_desc_len;
1190
1191                         if (dma_desc_len && !skb) {
1192                                 skb = xlgmac_create_skb(pdata, napi, desc_data,
1193                                                         dma_desc_len);
1194                                 if (!skb)
1195                                         error = 1;
1196                         } else if (dma_desc_len) {
1197                                 dma_sync_single_range_for_cpu(
1198                                                 pdata->dev,
1199                                                 desc_data->rx.buf.dma_base,
1200                                                 desc_data->rx.buf.dma_off,
1201                                                 desc_data->rx.buf.dma_len,
1202                                                 DMA_FROM_DEVICE);
1203
1204                                 skb_add_rx_frag(
1205                                         skb, skb_shinfo(skb)->nr_frags,
1206                                         desc_data->rx.buf.pa.pages,
1207                                         desc_data->rx.buf.pa.pages_offset,
1208                                         dma_desc_len,
1209                                         desc_data->rx.buf.dma_len);
1210                                 desc_data->rx.buf.pa.pages = NULL;
1211                         }
1212                 }
1213
1214                 if (incomplete || context_next)
1215                         goto read_again;
1216
1217                 if (!skb)
1218                         goto next_packet;
1219
1220                 /* Be sure we don't exceed the configured MTU */
1221                 max_len = netdev->mtu + ETH_HLEN;
1222                 if (!(netdev->features & NETIF_F_HW_VLAN_CTAG_RX) &&
1223                     (skb->protocol == htons(ETH_P_8021Q)))
1224                         max_len += VLAN_HLEN;
1225
1226                 if (skb->len > max_len) {
1227                         netif_err(pdata, rx_err, netdev,
1228                                   "packet length exceeds configured MTU\n");
1229                         dev_kfree_skb(skb);
1230                         goto next_packet;
1231                 }
1232
1233                 if (netif_msg_pktdata(pdata))
1234                         xlgmac_print_pkt(netdev, skb, false);
1235
1236                 skb_checksum_none_assert(skb);
1237                 if (XLGMAC_GET_REG_BITS(pkt_info->attributes,
1238                                         RX_PACKET_ATTRIBUTES_CSUM_DONE_POS,
1239                                     RX_PACKET_ATTRIBUTES_CSUM_DONE_LEN))
1240                         skb->ip_summed = CHECKSUM_UNNECESSARY;
1241
1242                 if (XLGMAC_GET_REG_BITS(pkt_info->attributes,
1243                                         RX_PACKET_ATTRIBUTES_VLAN_CTAG_POS,
1244                                     RX_PACKET_ATTRIBUTES_VLAN_CTAG_LEN)) {
1245                         __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q),
1246                                                pkt_info->vlan_ctag);
1247                         pdata->stats.rx_vlan_packets++;
1248                 }
1249
1250                 if (XLGMAC_GET_REG_BITS(pkt_info->attributes,
1251                                         RX_PACKET_ATTRIBUTES_RSS_HASH_POS,
1252                                     RX_PACKET_ATTRIBUTES_RSS_HASH_LEN))
1253                         skb_set_hash(skb, pkt_info->rss_hash,
1254                                      pkt_info->rss_hash_type);
1255
1256                 skb->dev = netdev;
1257                 skb->protocol = eth_type_trans(skb, netdev);
1258                 skb_record_rx_queue(skb, channel->queue_index);
1259
1260                 napi_gro_receive(napi, skb);
1261
1262 next_packet:
1263                 packet_count++;
1264         }
1265
1266         /* Check if we need to save state before leaving */
1267         if (received && (incomplete || context_next)) {
1268                 desc_data = XLGMAC_GET_DESC_DATA(ring, ring->cur);
1269                 desc_data->state_saved = 1;
1270                 desc_data->state.skb = skb;
1271                 desc_data->state.len = len;
1272                 desc_data->state.error = error;
1273         }
1274
1275         XLGMAC_PR("packet_count = %d\n", packet_count);
1276
1277         return packet_count;
1278 }
1279
1280 static int xlgmac_one_poll(struct napi_struct *napi, int budget)
1281 {
1282         struct xlgmac_channel *channel = container_of(napi,
1283                                                 struct xlgmac_channel,
1284                                                 napi);
1285         int processed = 0;
1286
1287         XLGMAC_PR("budget=%d\n", budget);
1288
1289         /* Cleanup Tx ring first */
1290         xlgmac_tx_poll(channel);
1291
1292         /* Process Rx ring next */
1293         processed = xlgmac_rx_poll(channel, budget);
1294
1295         /* If we processed everything, we are done */
1296         if (processed < budget) {
1297                 /* Turn off polling */
1298                 napi_complete_done(napi, processed);
1299
1300                 /* Enable Tx and Rx interrupts */
1301                 enable_irq(channel->dma_irq);
1302         }
1303
1304         XLGMAC_PR("received = %d\n", processed);
1305
1306         return processed;
1307 }
1308
1309 static int xlgmac_all_poll(struct napi_struct *napi, int budget)
1310 {
1311         struct xlgmac_pdata *pdata = container_of(napi,
1312                                                    struct xlgmac_pdata,
1313                                                    napi);
1314         struct xlgmac_channel *channel;
1315         int processed, last_processed;
1316         int ring_budget;
1317         unsigned int i;
1318
1319         XLGMAC_PR("budget=%d\n", budget);
1320
1321         processed = 0;
1322         ring_budget = budget / pdata->rx_ring_count;
1323         do {
1324                 last_processed = processed;
1325
1326                 channel = pdata->channel_head;
1327                 for (i = 0; i < pdata->channel_count; i++, channel++) {
1328                         /* Cleanup Tx ring first */
1329                         xlgmac_tx_poll(channel);
1330
1331                         /* Process Rx ring next */
1332                         if (ring_budget > (budget - processed))
1333                                 ring_budget = budget - processed;
1334                         processed += xlgmac_rx_poll(channel, ring_budget);
1335                 }
1336         } while ((processed < budget) && (processed != last_processed));
1337
1338         /* If we processed everything, we are done */
1339         if (processed < budget) {
1340                 /* Turn off polling */
1341                 napi_complete_done(napi, processed);
1342
1343                 /* Enable Tx and Rx interrupts */
1344                 xlgmac_enable_rx_tx_ints(pdata);
1345         }
1346
1347         XLGMAC_PR("received = %d\n", processed);
1348
1349         return processed;
1350 }