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_tcp_all_headers(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); 423 424 napi_enable(&channel->napi); 425 } 426 } else { 427 if (add) 428 netif_napi_add(pdata->netdev, &pdata->napi, 429 xlgmac_all_poll); 430 431 napi_enable(&pdata->napi); 432 } 433} 434 435static void xlgmac_napi_disable(struct xlgmac_pdata *pdata, unsigned int del) 436{ 437 struct xlgmac_channel *channel; 438 unsigned int i; 439 440 if (pdata->per_channel_irq) { 441 channel = pdata->channel_head; 442 for (i = 0; i < pdata->channel_count; i++, channel++) { 443 napi_disable(&channel->napi); 444 445 if (del) 446 netif_napi_del(&channel->napi); 447 } 448 } else { 449 napi_disable(&pdata->napi); 450 451 if (del) 452 netif_napi_del(&pdata->napi); 453 } 454} 455 456static int xlgmac_request_irqs(struct xlgmac_pdata *pdata) 457{ 458 struct net_device *netdev = pdata->netdev; 459 struct xlgmac_channel *channel; 460 unsigned int i; 461 int ret; 462 463 ret = devm_request_irq(pdata->dev, pdata->dev_irq, xlgmac_isr, 464 IRQF_SHARED, netdev->name, pdata); 465 if (ret) { 466 netdev_alert(netdev, "error requesting irq %d\n", 467 pdata->dev_irq); 468 return ret; 469 } 470 471 if (!pdata->per_channel_irq) 472 return 0; 473 474 channel = pdata->channel_head; 475 for (i = 0; i < pdata->channel_count; i++, channel++) { 476 snprintf(channel->dma_irq_name, 477 sizeof(channel->dma_irq_name) - 1, 478 "%s-TxRx-%u", netdev_name(netdev), 479 channel->queue_index); 480 481 ret = devm_request_irq(pdata->dev, channel->dma_irq, 482 xlgmac_dma_isr, 0, 483 channel->dma_irq_name, channel); 484 if (ret) { 485 netdev_alert(netdev, "error requesting irq %d\n", 486 channel->dma_irq); 487 goto err_irq; 488 } 489 } 490 491 return 0; 492 493err_irq: 494 /* Using an unsigned int, 'i' will go to UINT_MAX and exit */ 495 for (i--, channel--; i < pdata->channel_count; i--, channel--) 496 devm_free_irq(pdata->dev, channel->dma_irq, channel); 497 498 devm_free_irq(pdata->dev, pdata->dev_irq, pdata); 499 500 return ret; 501} 502 503static void xlgmac_free_irqs(struct xlgmac_pdata *pdata) 504{ 505 struct xlgmac_channel *channel; 506 unsigned int i; 507 508 devm_free_irq(pdata->dev, pdata->dev_irq, pdata); 509 510 if (!pdata->per_channel_irq) 511 return; 512 513 channel = pdata->channel_head; 514 for (i = 0; i < pdata->channel_count; i++, channel++) 515 devm_free_irq(pdata->dev, channel->dma_irq, channel); 516} 517 518static void xlgmac_free_tx_data(struct xlgmac_pdata *pdata) 519{ 520 struct xlgmac_desc_ops *desc_ops = &pdata->desc_ops; 521 struct xlgmac_desc_data *desc_data; 522 struct xlgmac_channel *channel; 523 struct xlgmac_ring *ring; 524 unsigned int i, j; 525 526 channel = pdata->channel_head; 527 for (i = 0; i < pdata->channel_count; i++, channel++) { 528 ring = channel->tx_ring; 529 if (!ring) 530 break; 531 532 for (j = 0; j < ring->dma_desc_count; j++) { 533 desc_data = XLGMAC_GET_DESC_DATA(ring, j); 534 desc_ops->unmap_desc_data(pdata, desc_data); 535 } 536 } 537} 538 539static void xlgmac_free_rx_data(struct xlgmac_pdata *pdata) 540{ 541 struct xlgmac_desc_ops *desc_ops = &pdata->desc_ops; 542 struct xlgmac_desc_data *desc_data; 543 struct xlgmac_channel *channel; 544 struct xlgmac_ring *ring; 545 unsigned int i, j; 546 547 channel = pdata->channel_head; 548 for (i = 0; i < pdata->channel_count; i++, channel++) { 549 ring = channel->rx_ring; 550 if (!ring) 551 break; 552 553 for (j = 0; j < ring->dma_desc_count; j++) { 554 desc_data = XLGMAC_GET_DESC_DATA(ring, j); 555 desc_ops->unmap_desc_data(pdata, desc_data); 556 } 557 } 558} 559 560static int xlgmac_start(struct xlgmac_pdata *pdata) 561{ 562 struct xlgmac_hw_ops *hw_ops = &pdata->hw_ops; 563 struct net_device *netdev = pdata->netdev; 564 int ret; 565 566 hw_ops->init(pdata); 567 xlgmac_napi_enable(pdata, 1); 568 569 ret = xlgmac_request_irqs(pdata); 570 if (ret) 571 goto err_napi; 572 573 hw_ops->enable_tx(pdata); 574 hw_ops->enable_rx(pdata); 575 netif_tx_start_all_queues(netdev); 576 577 return 0; 578 579err_napi: 580 xlgmac_napi_disable(pdata, 1); 581 hw_ops->exit(pdata); 582 583 return ret; 584} 585 586static void xlgmac_stop(struct xlgmac_pdata *pdata) 587{ 588 struct xlgmac_hw_ops *hw_ops = &pdata->hw_ops; 589 struct net_device *netdev = pdata->netdev; 590 struct xlgmac_channel *channel; 591 struct netdev_queue *txq; 592 unsigned int i; 593 594 netif_tx_stop_all_queues(netdev); 595 xlgmac_stop_timers(pdata); 596 hw_ops->disable_tx(pdata); 597 hw_ops->disable_rx(pdata); 598 xlgmac_free_irqs(pdata); 599 xlgmac_napi_disable(pdata, 1); 600 hw_ops->exit(pdata); 601 602 channel = pdata->channel_head; 603 for (i = 0; i < pdata->channel_count; i++, channel++) { 604 if (!channel->tx_ring) 605 continue; 606 607 txq = netdev_get_tx_queue(netdev, channel->queue_index); 608 netdev_tx_reset_queue(txq); 609 } 610} 611 612static void xlgmac_restart_dev(struct xlgmac_pdata *pdata) 613{ 614 /* If not running, "restart" will happen on open */ 615 if (!netif_running(pdata->netdev)) 616 return; 617 618 xlgmac_stop(pdata); 619 620 xlgmac_free_tx_data(pdata); 621 xlgmac_free_rx_data(pdata); 622 623 xlgmac_start(pdata); 624} 625 626static void xlgmac_restart(struct work_struct *work) 627{ 628 struct xlgmac_pdata *pdata = container_of(work, 629 struct xlgmac_pdata, 630 restart_work); 631 632 rtnl_lock(); 633 634 xlgmac_restart_dev(pdata); 635 636 rtnl_unlock(); 637} 638 639static int xlgmac_open(struct net_device *netdev) 640{ 641 struct xlgmac_pdata *pdata = netdev_priv(netdev); 642 struct xlgmac_desc_ops *desc_ops; 643 int ret; 644 645 desc_ops = &pdata->desc_ops; 646 647 /* TODO: Initialize the phy */ 648 649 /* Calculate the Rx buffer size before allocating rings */ 650 ret = xlgmac_calc_rx_buf_size(netdev, netdev->mtu); 651 if (ret < 0) 652 return ret; 653 pdata->rx_buf_size = ret; 654 655 /* Allocate the channels and rings */ 656 ret = desc_ops->alloc_channels_and_rings(pdata); 657 if (ret) 658 return ret; 659 660 INIT_WORK(&pdata->restart_work, xlgmac_restart); 661 xlgmac_init_timers(pdata); 662 663 ret = xlgmac_start(pdata); 664 if (ret) 665 goto err_channels_and_rings; 666 667 return 0; 668 669err_channels_and_rings: 670 desc_ops->free_channels_and_rings(pdata); 671 672 return ret; 673} 674 675static int xlgmac_close(struct net_device *netdev) 676{ 677 struct xlgmac_pdata *pdata = netdev_priv(netdev); 678 struct xlgmac_desc_ops *desc_ops; 679 680 desc_ops = &pdata->desc_ops; 681 682 /* Stop the device */ 683 xlgmac_stop(pdata); 684 685 /* Free the channels and rings */ 686 desc_ops->free_channels_and_rings(pdata); 687 688 return 0; 689} 690 691static void xlgmac_tx_timeout(struct net_device *netdev, unsigned int txqueue) 692{ 693 struct xlgmac_pdata *pdata = netdev_priv(netdev); 694 695 netdev_warn(netdev, "tx timeout, device restarting\n"); 696 schedule_work(&pdata->restart_work); 697} 698 699static netdev_tx_t xlgmac_xmit(struct sk_buff *skb, struct net_device *netdev) 700{ 701 struct xlgmac_pdata *pdata = netdev_priv(netdev); 702 struct xlgmac_pkt_info *tx_pkt_info; 703 struct xlgmac_desc_ops *desc_ops; 704 struct xlgmac_channel *channel; 705 struct xlgmac_hw_ops *hw_ops; 706 struct netdev_queue *txq; 707 struct xlgmac_ring *ring; 708 int ret; 709 710 desc_ops = &pdata->desc_ops; 711 hw_ops = &pdata->hw_ops; 712 713 XLGMAC_PR("skb->len = %d\n", skb->len); 714 715 channel = pdata->channel_head + skb->queue_mapping; 716 txq = netdev_get_tx_queue(netdev, channel->queue_index); 717 ring = channel->tx_ring; 718 tx_pkt_info = &ring->pkt_info; 719 720 if (skb->len == 0) { 721 netif_err(pdata, tx_err, netdev, 722 "empty skb received from stack\n"); 723 dev_kfree_skb_any(skb); 724 return NETDEV_TX_OK; 725 } 726 727 /* Prepare preliminary packet info for TX */ 728 memset(tx_pkt_info, 0, sizeof(*tx_pkt_info)); 729 xlgmac_prep_tx_pkt(pdata, ring, skb, tx_pkt_info); 730 731 /* Check that there are enough descriptors available */ 732 ret = xlgmac_maybe_stop_tx_queue(channel, ring, 733 tx_pkt_info->desc_count); 734 if (ret) 735 return ret; 736 737 ret = xlgmac_prep_tso(skb, tx_pkt_info); 738 if (ret) { 739 netif_err(pdata, tx_err, netdev, 740 "error processing TSO packet\n"); 741 dev_kfree_skb_any(skb); 742 return ret; 743 } 744 xlgmac_prep_vlan(skb, tx_pkt_info); 745 746 if (!desc_ops->map_tx_skb(channel, skb)) { 747 dev_kfree_skb_any(skb); 748 return NETDEV_TX_OK; 749 } 750 751 /* Report on the actual number of bytes (to be) sent */ 752 netdev_tx_sent_queue(txq, tx_pkt_info->tx_bytes); 753 754 /* Configure required descriptor fields for transmission */ 755 hw_ops->dev_xmit(channel); 756 757 if (netif_msg_pktdata(pdata)) 758 xlgmac_print_pkt(netdev, skb, true); 759 760 /* Stop the queue in advance if there may not be enough descriptors */ 761 xlgmac_maybe_stop_tx_queue(channel, ring, XLGMAC_TX_MAX_DESC_NR); 762 763 return NETDEV_TX_OK; 764} 765 766static void xlgmac_get_stats64(struct net_device *netdev, 767 struct rtnl_link_stats64 *s) 768{ 769 struct xlgmac_pdata *pdata = netdev_priv(netdev); 770 struct xlgmac_stats *pstats = &pdata->stats; 771 772 pdata->hw_ops.read_mmc_stats(pdata); 773 774 s->rx_packets = pstats->rxframecount_gb; 775 s->rx_bytes = pstats->rxoctetcount_gb; 776 s->rx_errors = pstats->rxframecount_gb - 777 pstats->rxbroadcastframes_g - 778 pstats->rxmulticastframes_g - 779 pstats->rxunicastframes_g; 780 s->multicast = pstats->rxmulticastframes_g; 781 s->rx_length_errors = pstats->rxlengtherror; 782 s->rx_crc_errors = pstats->rxcrcerror; 783 s->rx_fifo_errors = pstats->rxfifooverflow; 784 785 s->tx_packets = pstats->txframecount_gb; 786 s->tx_bytes = pstats->txoctetcount_gb; 787 s->tx_errors = pstats->txframecount_gb - pstats->txframecount_g; 788 s->tx_dropped = netdev->stats.tx_dropped; 789} 790 791static int xlgmac_set_mac_address(struct net_device *netdev, void *addr) 792{ 793 struct xlgmac_pdata *pdata = netdev_priv(netdev); 794 struct xlgmac_hw_ops *hw_ops = &pdata->hw_ops; 795 struct sockaddr *saddr = addr; 796 797 if (!is_valid_ether_addr(saddr->sa_data)) 798 return -EADDRNOTAVAIL; 799 800 eth_hw_addr_set(netdev, saddr->sa_data); 801 802 hw_ops->set_mac_address(pdata, netdev->dev_addr); 803 804 return 0; 805} 806 807static int xlgmac_ioctl(struct net_device *netdev, 808 struct ifreq *ifreq, int cmd) 809{ 810 if (!netif_running(netdev)) 811 return -ENODEV; 812 813 return 0; 814} 815 816static int xlgmac_change_mtu(struct net_device *netdev, int mtu) 817{ 818 struct xlgmac_pdata *pdata = netdev_priv(netdev); 819 int ret; 820 821 ret = xlgmac_calc_rx_buf_size(netdev, mtu); 822 if (ret < 0) 823 return ret; 824 825 pdata->rx_buf_size = ret; 826 netdev->mtu = mtu; 827 828 xlgmac_restart_dev(pdata); 829 830 return 0; 831} 832 833static int xlgmac_vlan_rx_add_vid(struct net_device *netdev, 834 __be16 proto, 835 u16 vid) 836{ 837 struct xlgmac_pdata *pdata = netdev_priv(netdev); 838 struct xlgmac_hw_ops *hw_ops = &pdata->hw_ops; 839 840 set_bit(vid, pdata->active_vlans); 841 hw_ops->update_vlan_hash_table(pdata); 842 843 return 0; 844} 845 846static int xlgmac_vlan_rx_kill_vid(struct net_device *netdev, 847 __be16 proto, 848 u16 vid) 849{ 850 struct xlgmac_pdata *pdata = netdev_priv(netdev); 851 struct xlgmac_hw_ops *hw_ops = &pdata->hw_ops; 852 853 clear_bit(vid, pdata->active_vlans); 854 hw_ops->update_vlan_hash_table(pdata); 855 856 return 0; 857} 858 859#ifdef CONFIG_NET_POLL_CONTROLLER 860static void xlgmac_poll_controller(struct net_device *netdev) 861{ 862 struct xlgmac_pdata *pdata = netdev_priv(netdev); 863 struct xlgmac_channel *channel; 864 unsigned int i; 865 866 if (pdata->per_channel_irq) { 867 channel = pdata->channel_head; 868 for (i = 0; i < pdata->channel_count; i++, channel++) 869 xlgmac_dma_isr(channel->dma_irq, channel); 870 } else { 871 disable_irq(pdata->dev_irq); 872 xlgmac_isr(pdata->dev_irq, pdata); 873 enable_irq(pdata->dev_irq); 874 } 875} 876#endif /* CONFIG_NET_POLL_CONTROLLER */ 877 878static int xlgmac_set_features(struct net_device *netdev, 879 netdev_features_t features) 880{ 881 netdev_features_t rxhash, rxcsum, rxvlan, rxvlan_filter; 882 struct xlgmac_pdata *pdata = netdev_priv(netdev); 883 struct xlgmac_hw_ops *hw_ops = &pdata->hw_ops; 884 int ret = 0; 885 886 rxhash = pdata->netdev_features & NETIF_F_RXHASH; 887 rxcsum = pdata->netdev_features & NETIF_F_RXCSUM; 888 rxvlan = pdata->netdev_features & NETIF_F_HW_VLAN_CTAG_RX; 889 rxvlan_filter = pdata->netdev_features & NETIF_F_HW_VLAN_CTAG_FILTER; 890 891 if ((features & NETIF_F_RXHASH) && !rxhash) 892 ret = hw_ops->enable_rss(pdata); 893 else if (!(features & NETIF_F_RXHASH) && rxhash) 894 ret = hw_ops->disable_rss(pdata); 895 if (ret) 896 return ret; 897 898 if ((features & NETIF_F_RXCSUM) && !rxcsum) 899 hw_ops->enable_rx_csum(pdata); 900 else if (!(features & NETIF_F_RXCSUM) && rxcsum) 901 hw_ops->disable_rx_csum(pdata); 902 903 if ((features & NETIF_F_HW_VLAN_CTAG_RX) && !rxvlan) 904 hw_ops->enable_rx_vlan_stripping(pdata); 905 else if (!(features & NETIF_F_HW_VLAN_CTAG_RX) && rxvlan) 906 hw_ops->disable_rx_vlan_stripping(pdata); 907 908 if ((features & NETIF_F_HW_VLAN_CTAG_FILTER) && !rxvlan_filter) 909 hw_ops->enable_rx_vlan_filtering(pdata); 910 else if (!(features & NETIF_F_HW_VLAN_CTAG_FILTER) && rxvlan_filter) 911 hw_ops->disable_rx_vlan_filtering(pdata); 912 913 pdata->netdev_features = features; 914 915 return 0; 916} 917 918static void xlgmac_set_rx_mode(struct net_device *netdev) 919{ 920 struct xlgmac_pdata *pdata = netdev_priv(netdev); 921 struct xlgmac_hw_ops *hw_ops = &pdata->hw_ops; 922 923 hw_ops->config_rx_mode(pdata); 924} 925 926static const struct net_device_ops xlgmac_netdev_ops = { 927 .ndo_open = xlgmac_open, 928 .ndo_stop = xlgmac_close, 929 .ndo_start_xmit = xlgmac_xmit, 930 .ndo_tx_timeout = xlgmac_tx_timeout, 931 .ndo_get_stats64 = xlgmac_get_stats64, 932 .ndo_change_mtu = xlgmac_change_mtu, 933 .ndo_set_mac_address = xlgmac_set_mac_address, 934 .ndo_validate_addr = eth_validate_addr, 935 .ndo_eth_ioctl = xlgmac_ioctl, 936 .ndo_vlan_rx_add_vid = xlgmac_vlan_rx_add_vid, 937 .ndo_vlan_rx_kill_vid = xlgmac_vlan_rx_kill_vid, 938#ifdef CONFIG_NET_POLL_CONTROLLER 939 .ndo_poll_controller = xlgmac_poll_controller, 940#endif 941 .ndo_set_features = xlgmac_set_features, 942 .ndo_set_rx_mode = xlgmac_set_rx_mode, 943}; 944 945const struct net_device_ops *xlgmac_get_netdev_ops(void) 946{ 947 return &xlgmac_netdev_ops; 948} 949 950static void xlgmac_rx_refresh(struct xlgmac_channel *channel) 951{ 952 struct xlgmac_pdata *pdata = channel->pdata; 953 struct xlgmac_ring *ring = channel->rx_ring; 954 struct xlgmac_desc_data *desc_data; 955 struct xlgmac_desc_ops *desc_ops; 956 struct xlgmac_hw_ops *hw_ops; 957 958 desc_ops = &pdata->desc_ops; 959 hw_ops = &pdata->hw_ops; 960 961 while (ring->dirty != ring->cur) { 962 desc_data = XLGMAC_GET_DESC_DATA(ring, ring->dirty); 963 964 /* Reset desc_data values */ 965 desc_ops->unmap_desc_data(pdata, desc_data); 966 967 if (desc_ops->map_rx_buffer(pdata, ring, desc_data)) 968 break; 969 970 hw_ops->rx_desc_reset(pdata, desc_data, ring->dirty); 971 972 ring->dirty++; 973 } 974 975 /* Make sure everything is written before the register write */ 976 wmb(); 977 978 /* Update the Rx Tail Pointer Register with address of 979 * the last cleaned entry 980 */ 981 desc_data = XLGMAC_GET_DESC_DATA(ring, ring->dirty - 1); 982 writel(lower_32_bits(desc_data->dma_desc_addr), 983 XLGMAC_DMA_REG(channel, DMA_CH_RDTR_LO)); 984} 985 986static struct sk_buff *xlgmac_create_skb(struct xlgmac_pdata *pdata, 987 struct napi_struct *napi, 988 struct xlgmac_desc_data *desc_data, 989 unsigned int len) 990{ 991 unsigned int copy_len; 992 struct sk_buff *skb; 993 u8 *packet; 994 995 skb = napi_alloc_skb(napi, desc_data->rx.hdr.dma_len); 996 if (!skb) 997 return NULL; 998 999 /* Start with the header buffer which may contain just the header 1000 * or the header plus data 1001 */ 1002 dma_sync_single_range_for_cpu(pdata->dev, desc_data->rx.hdr.dma_base, 1003 desc_data->rx.hdr.dma_off, 1004 desc_data->rx.hdr.dma_len, 1005 DMA_FROM_DEVICE); 1006 1007 packet = page_address(desc_data->rx.hdr.pa.pages) + 1008 desc_data->rx.hdr.pa.pages_offset; 1009 copy_len = (desc_data->rx.hdr_len) ? desc_data->rx.hdr_len : len; 1010 copy_len = min(desc_data->rx.hdr.dma_len, copy_len); 1011 skb_copy_to_linear_data(skb, packet, copy_len); 1012 skb_put(skb, copy_len); 1013 1014 len -= copy_len; 1015 if (len) { 1016 /* Add the remaining data as a frag */ 1017 dma_sync_single_range_for_cpu(pdata->dev, 1018 desc_data->rx.buf.dma_base, 1019 desc_data->rx.buf.dma_off, 1020 desc_data->rx.buf.dma_len, 1021 DMA_FROM_DEVICE); 1022 1023 skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, 1024 desc_data->rx.buf.pa.pages, 1025 desc_data->rx.buf.pa.pages_offset, 1026 len, desc_data->rx.buf.dma_len); 1027 desc_data->rx.buf.pa.pages = NULL; 1028 } 1029 1030 return skb; 1031} 1032 1033static int xlgmac_tx_poll(struct xlgmac_channel *channel) 1034{ 1035 struct xlgmac_pdata *pdata = channel->pdata; 1036 struct xlgmac_ring *ring = channel->tx_ring; 1037 struct net_device *netdev = pdata->netdev; 1038 unsigned int tx_packets = 0, tx_bytes = 0; 1039 struct xlgmac_desc_data *desc_data; 1040 struct xlgmac_dma_desc *dma_desc; 1041 struct xlgmac_desc_ops *desc_ops; 1042 struct xlgmac_hw_ops *hw_ops; 1043 struct netdev_queue *txq; 1044 int processed = 0; 1045 unsigned int cur; 1046 1047 desc_ops = &pdata->desc_ops; 1048 hw_ops = &pdata->hw_ops; 1049 1050 /* Nothing to do if there isn't a Tx ring for this channel */ 1051 if (!ring) 1052 return 0; 1053 1054 cur = ring->cur; 1055 1056 /* Be sure we get ring->cur before accessing descriptor data */ 1057 smp_rmb(); 1058 1059 txq = netdev_get_tx_queue(netdev, channel->queue_index); 1060 1061 while ((processed < XLGMAC_TX_DESC_MAX_PROC) && 1062 (ring->dirty != cur)) { 1063 desc_data = XLGMAC_GET_DESC_DATA(ring, ring->dirty); 1064 dma_desc = desc_data->dma_desc; 1065 1066 if (!hw_ops->tx_complete(dma_desc)) 1067 break; 1068 1069 /* Make sure descriptor fields are read after reading 1070 * the OWN bit 1071 */ 1072 dma_rmb(); 1073 1074 if (netif_msg_tx_done(pdata)) 1075 xlgmac_dump_tx_desc(pdata, ring, ring->dirty, 1, 0); 1076 1077 if (hw_ops->is_last_desc(dma_desc)) { 1078 tx_packets += desc_data->tx.packets; 1079 tx_bytes += desc_data->tx.bytes; 1080 } 1081 1082 /* Free the SKB and reset the descriptor for re-use */ 1083 desc_ops->unmap_desc_data(pdata, desc_data); 1084 hw_ops->tx_desc_reset(desc_data); 1085 1086 processed++; 1087 ring->dirty++; 1088 } 1089 1090 if (!processed) 1091 return 0; 1092 1093 netdev_tx_completed_queue(txq, tx_packets, tx_bytes); 1094 1095 if ((ring->tx.queue_stopped == 1) && 1096 (xlgmac_tx_avail_desc(ring) > XLGMAC_TX_DESC_MIN_FREE)) { 1097 ring->tx.queue_stopped = 0; 1098 netif_tx_wake_queue(txq); 1099 } 1100 1101 XLGMAC_PR("processed=%d\n", processed); 1102 1103 return processed; 1104} 1105 1106static int xlgmac_rx_poll(struct xlgmac_channel *channel, int budget) 1107{ 1108 struct xlgmac_pdata *pdata = channel->pdata; 1109 struct xlgmac_ring *ring = channel->rx_ring; 1110 struct net_device *netdev = pdata->netdev; 1111 unsigned int len, dma_desc_len, max_len; 1112 unsigned int context_next, context; 1113 struct xlgmac_desc_data *desc_data; 1114 struct xlgmac_pkt_info *pkt_info; 1115 unsigned int incomplete, error; 1116 struct xlgmac_hw_ops *hw_ops; 1117 unsigned int received = 0; 1118 struct napi_struct *napi; 1119 struct sk_buff *skb; 1120 int packet_count = 0; 1121 1122 hw_ops = &pdata->hw_ops; 1123 1124 /* Nothing to do if there isn't a Rx ring for this channel */ 1125 if (!ring) 1126 return 0; 1127 1128 incomplete = 0; 1129 context_next = 0; 1130 1131 napi = (pdata->per_channel_irq) ? &channel->napi : &pdata->napi; 1132 1133 desc_data = XLGMAC_GET_DESC_DATA(ring, ring->cur); 1134 pkt_info = &ring->pkt_info; 1135 while (packet_count < budget) { 1136 /* First time in loop see if we need to restore state */ 1137 if (!received && desc_data->state_saved) { 1138 skb = desc_data->state.skb; 1139 error = desc_data->state.error; 1140 len = desc_data->state.len; 1141 } else { 1142 memset(pkt_info, 0, sizeof(*pkt_info)); 1143 skb = NULL; 1144 error = 0; 1145 len = 0; 1146 } 1147 1148read_again: 1149 desc_data = XLGMAC_GET_DESC_DATA(ring, ring->cur); 1150 1151 if (xlgmac_rx_dirty_desc(ring) > XLGMAC_RX_DESC_MAX_DIRTY) 1152 xlgmac_rx_refresh(channel); 1153 1154 if (hw_ops->dev_read(channel)) 1155 break; 1156 1157 received++; 1158 ring->cur++; 1159 1160 incomplete = XLGMAC_GET_REG_BITS( 1161 pkt_info->attributes, 1162 RX_PACKET_ATTRIBUTES_INCOMPLETE_POS, 1163 RX_PACKET_ATTRIBUTES_INCOMPLETE_LEN); 1164 context_next = XLGMAC_GET_REG_BITS( 1165 pkt_info->attributes, 1166 RX_PACKET_ATTRIBUTES_CONTEXT_NEXT_POS, 1167 RX_PACKET_ATTRIBUTES_CONTEXT_NEXT_LEN); 1168 context = XLGMAC_GET_REG_BITS( 1169 pkt_info->attributes, 1170 RX_PACKET_ATTRIBUTES_CONTEXT_POS, 1171 RX_PACKET_ATTRIBUTES_CONTEXT_LEN); 1172 1173 /* Earlier error, just drain the remaining data */ 1174 if ((incomplete || context_next) && error) 1175 goto read_again; 1176 1177 if (error || pkt_info->errors) { 1178 if (pkt_info->errors) 1179 netif_err(pdata, rx_err, netdev, 1180 "error in received packet\n"); 1181 dev_kfree_skb(skb); 1182 goto next_packet; 1183 } 1184 1185 if (!context) { 1186 /* Length is cumulative, get this descriptor's length */ 1187 dma_desc_len = desc_data->rx.len - len; 1188 len += dma_desc_len; 1189 1190 if (dma_desc_len && !skb) { 1191 skb = xlgmac_create_skb(pdata, napi, desc_data, 1192 dma_desc_len); 1193 if (!skb) 1194 error = 1; 1195 } else if (dma_desc_len) { 1196 dma_sync_single_range_for_cpu( 1197 pdata->dev, 1198 desc_data->rx.buf.dma_base, 1199 desc_data->rx.buf.dma_off, 1200 desc_data->rx.buf.dma_len, 1201 DMA_FROM_DEVICE); 1202 1203 skb_add_rx_frag( 1204 skb, skb_shinfo(skb)->nr_frags, 1205 desc_data->rx.buf.pa.pages, 1206 desc_data->rx.buf.pa.pages_offset, 1207 dma_desc_len, 1208 desc_data->rx.buf.dma_len); 1209 desc_data->rx.buf.pa.pages = NULL; 1210 } 1211 } 1212 1213 if (incomplete || context_next) 1214 goto read_again; 1215 1216 if (!skb) 1217 goto next_packet; 1218 1219 /* Be sure we don't exceed the configured MTU */ 1220 max_len = netdev->mtu + ETH_HLEN; 1221 if (!(netdev->features & NETIF_F_HW_VLAN_CTAG_RX) && 1222 (skb->protocol == htons(ETH_P_8021Q))) 1223 max_len += VLAN_HLEN; 1224 1225 if (skb->len > max_len) { 1226 netif_err(pdata, rx_err, netdev, 1227 "packet length exceeds configured MTU\n"); 1228 dev_kfree_skb(skb); 1229 goto next_packet; 1230 } 1231 1232 if (netif_msg_pktdata(pdata)) 1233 xlgmac_print_pkt(netdev, skb, false); 1234 1235 skb_checksum_none_assert(skb); 1236 if (XLGMAC_GET_REG_BITS(pkt_info->attributes, 1237 RX_PACKET_ATTRIBUTES_CSUM_DONE_POS, 1238 RX_PACKET_ATTRIBUTES_CSUM_DONE_LEN)) 1239 skb->ip_summed = CHECKSUM_UNNECESSARY; 1240 1241 if (XLGMAC_GET_REG_BITS(pkt_info->attributes, 1242 RX_PACKET_ATTRIBUTES_VLAN_CTAG_POS, 1243 RX_PACKET_ATTRIBUTES_VLAN_CTAG_LEN)) { 1244 __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), 1245 pkt_info->vlan_ctag); 1246 pdata->stats.rx_vlan_packets++; 1247 } 1248 1249 if (XLGMAC_GET_REG_BITS(pkt_info->attributes, 1250 RX_PACKET_ATTRIBUTES_RSS_HASH_POS, 1251 RX_PACKET_ATTRIBUTES_RSS_HASH_LEN)) 1252 skb_set_hash(skb, pkt_info->rss_hash, 1253 pkt_info->rss_hash_type); 1254 1255 skb->dev = netdev; 1256 skb->protocol = eth_type_trans(skb, netdev); 1257 skb_record_rx_queue(skb, channel->queue_index); 1258 1259 napi_gro_receive(napi, skb); 1260 1261next_packet: 1262 packet_count++; 1263 } 1264 1265 /* Check if we need to save state before leaving */ 1266 if (received && (incomplete || context_next)) { 1267 desc_data = XLGMAC_GET_DESC_DATA(ring, ring->cur); 1268 desc_data->state_saved = 1; 1269 desc_data->state.skb = skb; 1270 desc_data->state.len = len; 1271 desc_data->state.error = error; 1272 } 1273 1274 XLGMAC_PR("packet_count = %d\n", packet_count); 1275 1276 return packet_count; 1277} 1278 1279static int xlgmac_one_poll(struct napi_struct *napi, int budget) 1280{ 1281 struct xlgmac_channel *channel = container_of(napi, 1282 struct xlgmac_channel, 1283 napi); 1284 int processed = 0; 1285 1286 XLGMAC_PR("budget=%d\n", budget); 1287 1288 /* Cleanup Tx ring first */ 1289 xlgmac_tx_poll(channel); 1290 1291 /* Process Rx ring next */ 1292 processed = xlgmac_rx_poll(channel, budget); 1293 1294 /* If we processed everything, we are done */ 1295 if (processed < budget) { 1296 /* Turn off polling */ 1297 napi_complete_done(napi, processed); 1298 1299 /* Enable Tx and Rx interrupts */ 1300 enable_irq(channel->dma_irq); 1301 } 1302 1303 XLGMAC_PR("received = %d\n", processed); 1304 1305 return processed; 1306} 1307 1308static int xlgmac_all_poll(struct napi_struct *napi, int budget) 1309{ 1310 struct xlgmac_pdata *pdata = container_of(napi, 1311 struct xlgmac_pdata, 1312 napi); 1313 struct xlgmac_channel *channel; 1314 int processed, last_processed; 1315 int ring_budget; 1316 unsigned int i; 1317 1318 XLGMAC_PR("budget=%d\n", budget); 1319 1320 processed = 0; 1321 ring_budget = budget / pdata->rx_ring_count; 1322 do { 1323 last_processed = processed; 1324 1325 channel = pdata->channel_head; 1326 for (i = 0; i < pdata->channel_count; i++, channel++) { 1327 /* Cleanup Tx ring first */ 1328 xlgmac_tx_poll(channel); 1329 1330 /* Process Rx ring next */ 1331 if (ring_budget > (budget - processed)) 1332 ring_budget = budget - processed; 1333 processed += xlgmac_rx_poll(channel, ring_budget); 1334 } 1335 } while ((processed < budget) && (processed != last_processed)); 1336 1337 /* If we processed everything, we are done */ 1338 if (processed < budget) { 1339 /* Turn off polling */ 1340 napi_complete_done(napi, processed); 1341 1342 /* Enable Tx and Rx interrupts */ 1343 xlgmac_enable_rx_tx_ints(pdata); 1344 } 1345 1346 XLGMAC_PR("received = %d\n", processed); 1347 1348 return processed; 1349} 1350