linux/drivers/net/ethernet/synopsys/dwc-xlgmac-net.c
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   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
  25static int xlgmac_one_poll(struct napi_struct *, int);
  26static int xlgmac_all_poll(struct napi_struct *, int);
  27
  28static inline unsigned int xlgmac_tx_avail_desc(struct xlgmac_ring *ring)
  29{
  30        return (ring->dma_desc_count - (ring->cur - ring->dirty));
  31}
  32
  33static inline unsigned int xlgmac_rx_dirty_desc(struct xlgmac_ring *ring)
  34{
  35        return (ring->cur - ring->dirty);
  36}
  37
  38static 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
  63static 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
  70static 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
 103static 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
 114static 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        skb_frag_t *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
 189static 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
 207static 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
 229static 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
 251static 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
 343static 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
 361static 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
 384static 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
 398static 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
 412static 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
 436static 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
 457static 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
 494err_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
 504static 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
 519static 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
 540static 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
 561static 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
 580err_napi:
 581        xlgmac_napi_disable(pdata, 1);
 582        hw_ops->exit(pdata);
 583
 584        return ret;
 585}
 586
 587static 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
 613static 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
 627static 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
 640static 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
 670err_channels_and_rings:
 671        desc_ops->free_channels_and_rings(pdata);
 672
 673        return ret;
 674}
 675
 676static 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
 692static 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
 700static 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
 767static 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
 792static 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
 808static 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
 817static 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
 834static 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
 847static 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
 861static 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
 879static 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
 919static 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
 927static 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
 946const struct net_device_ops *xlgmac_get_netdev_ops(void)
 947{
 948        return &xlgmac_netdev_ops;
 949}
 950
 951static 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
 987static 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
1034static 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
1107static 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
1149read_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
1262next_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
1280static 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
1309static 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}
1351