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 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 } 188 189 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, unsigned int txqueue) 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 netdev_tx_t 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 } 1351