1 /* 2 * AMD 10Gb Ethernet driver 3 * 4 * This file is available to you under your choice of the following two 5 * licenses: 6 * 7 * License 1: GPLv2 8 * 9 * Copyright (c) 2014 Advanced Micro Devices, Inc. 10 * 11 * This file is free software; you may copy, redistribute and/or modify 12 * it under the terms of the GNU General Public License as published by 13 * the Free Software Foundation, either version 2 of the License, or (at 14 * your option) any later version. 15 * 16 * This file is distributed in the hope that it will be useful, but 17 * WITHOUT ANY WARRANTY; without even the implied warranty of 18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 19 * General Public License for more details. 20 * 21 * You should have received a copy of the GNU General Public License 22 * along with this program. If not, see <http://www.gnu.org/licenses/>. 23 * 24 * This file incorporates work covered by the following copyright and 25 * permission notice: 26 * The Synopsys DWC ETHER XGMAC Software Driver and documentation 27 * (hereinafter "Software") is an unsupported proprietary work of Synopsys, 28 * Inc. unless otherwise expressly agreed to in writing between Synopsys 29 * and you. 30 * 31 * The Software IS NOT an item of Licensed Software or Licensed Product 32 * under any End User Software License Agreement or Agreement for Licensed 33 * Product with Synopsys or any supplement thereto. Permission is hereby 34 * granted, free of charge, to any person obtaining a copy of this software 35 * annotated with this license and the Software, to deal in the Software 36 * without restriction, including without limitation the rights to use, 37 * copy, modify, merge, publish, distribute, sublicense, and/or sell copies 38 * of the Software, and to permit persons to whom the Software is furnished 39 * to do so, subject to the following conditions: 40 * 41 * The above copyright notice and this permission notice shall be included 42 * in all copies or substantial portions of the Software. 43 * 44 * THIS SOFTWARE IS BEING DISTRIBUTED BY SYNOPSYS SOLELY ON AN "AS IS" 45 * BASIS AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 46 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A 47 * PARTICULAR PURPOSE ARE HEREBY DISCLAIMED. IN NO EVENT SHALL SYNOPSYS 48 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 49 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 50 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 51 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 52 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 53 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 54 * THE POSSIBILITY OF SUCH DAMAGE. 55 * 56 * 57 * License 2: Modified BSD 58 * 59 * Copyright (c) 2014 Advanced Micro Devices, Inc. 60 * All rights reserved. 61 * 62 * Redistribution and use in source and binary forms, with or without 63 * modification, are permitted provided that the following conditions are met: 64 * * Redistributions of source code must retain the above copyright 65 * notice, this list of conditions and the following disclaimer. 66 * * Redistributions in binary form must reproduce the above copyright 67 * notice, this list of conditions and the following disclaimer in the 68 * documentation and/or other materials provided with the distribution. 69 * * Neither the name of Advanced Micro Devices, Inc. nor the 70 * names of its contributors may be used to endorse or promote products 71 * derived from this software without specific prior written permission. 72 * 73 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 74 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 75 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 76 * ARE DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY 77 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 78 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 79 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 80 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 81 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 82 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 83 * 84 * This file incorporates work covered by the following copyright and 85 * permission notice: 86 * The Synopsys DWC ETHER XGMAC Software Driver and documentation 87 * (hereinafter "Software") is an unsupported proprietary work of Synopsys, 88 * Inc. unless otherwise expressly agreed to in writing between Synopsys 89 * and you. 90 * 91 * The Software IS NOT an item of Licensed Software or Licensed Product 92 * under any End User Software License Agreement or Agreement for Licensed 93 * Product with Synopsys or any supplement thereto. Permission is hereby 94 * granted, free of charge, to any person obtaining a copy of this software 95 * annotated with this license and the Software, to deal in the Software 96 * without restriction, including without limitation the rights to use, 97 * copy, modify, merge, publish, distribute, sublicense, and/or sell copies 98 * of the Software, and to permit persons to whom the Software is furnished 99 * to do so, subject to the following conditions: 100 * 101 * The above copyright notice and this permission notice shall be included 102 * in all copies or substantial portions of the Software. 103 * 104 * THIS SOFTWARE IS BEING DISTRIBUTED BY SYNOPSYS SOLELY ON AN "AS IS" 105 * BASIS AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 106 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A 107 * PARTICULAR PURPOSE ARE HEREBY DISCLAIMED. IN NO EVENT SHALL SYNOPSYS 108 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 109 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 110 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 111 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 112 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 113 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 114 * THE POSSIBILITY OF SUCH DAMAGE. 115 */ 116 117 #include "xgbe.h" 118 #include "xgbe-common.h" 119 120 static void xgbe_unmap_rdata(struct xgbe_prv_data *, struct xgbe_ring_data *); 121 122 static void xgbe_free_ring(struct xgbe_prv_data *pdata, 123 struct xgbe_ring *ring) 124 { 125 struct xgbe_ring_data *rdata; 126 unsigned int i; 127 128 if (!ring) 129 return; 130 131 if (ring->rdata) { 132 for (i = 0; i < ring->rdesc_count; i++) { 133 rdata = XGBE_GET_DESC_DATA(ring, i); 134 xgbe_unmap_rdata(pdata, rdata); 135 } 136 137 kfree(ring->rdata); 138 ring->rdata = NULL; 139 } 140 141 if (ring->rx_hdr_pa.pages) { 142 dma_unmap_page(pdata->dev, ring->rx_hdr_pa.pages_dma, 143 ring->rx_hdr_pa.pages_len, DMA_FROM_DEVICE); 144 put_page(ring->rx_hdr_pa.pages); 145 146 ring->rx_hdr_pa.pages = NULL; 147 ring->rx_hdr_pa.pages_len = 0; 148 ring->rx_hdr_pa.pages_offset = 0; 149 ring->rx_hdr_pa.pages_dma = 0; 150 } 151 152 if (ring->rx_buf_pa.pages) { 153 dma_unmap_page(pdata->dev, ring->rx_buf_pa.pages_dma, 154 ring->rx_buf_pa.pages_len, DMA_FROM_DEVICE); 155 put_page(ring->rx_buf_pa.pages); 156 157 ring->rx_buf_pa.pages = NULL; 158 ring->rx_buf_pa.pages_len = 0; 159 ring->rx_buf_pa.pages_offset = 0; 160 ring->rx_buf_pa.pages_dma = 0; 161 } 162 163 if (ring->rdesc) { 164 dma_free_coherent(pdata->dev, 165 (sizeof(struct xgbe_ring_desc) * 166 ring->rdesc_count), 167 ring->rdesc, ring->rdesc_dma); 168 ring->rdesc = NULL; 169 } 170 } 171 172 static void xgbe_free_ring_resources(struct xgbe_prv_data *pdata) 173 { 174 struct xgbe_channel *channel; 175 unsigned int i; 176 177 DBGPR("-->xgbe_free_ring_resources\n"); 178 179 for (i = 0; i < pdata->channel_count; i++) { 180 channel = pdata->channel[i]; 181 xgbe_free_ring(pdata, channel->tx_ring); 182 xgbe_free_ring(pdata, channel->rx_ring); 183 } 184 185 DBGPR("<--xgbe_free_ring_resources\n"); 186 } 187 188 static void *xgbe_alloc_node(size_t size, int node) 189 { 190 void *mem; 191 192 mem = kzalloc_node(size, GFP_KERNEL, node); 193 if (!mem) 194 mem = kzalloc(size, GFP_KERNEL); 195 196 return mem; 197 } 198 199 static void *xgbe_dma_alloc_node(struct device *dev, size_t size, 200 dma_addr_t *dma, int node) 201 { 202 void *mem; 203 int cur_node = dev_to_node(dev); 204 205 set_dev_node(dev, node); 206 mem = dma_alloc_coherent(dev, size, dma, GFP_KERNEL); 207 set_dev_node(dev, cur_node); 208 209 if (!mem) 210 mem = dma_alloc_coherent(dev, size, dma, GFP_KERNEL); 211 212 return mem; 213 } 214 215 static int xgbe_init_ring(struct xgbe_prv_data *pdata, 216 struct xgbe_ring *ring, unsigned int rdesc_count) 217 { 218 size_t size; 219 220 if (!ring) 221 return 0; 222 223 /* Descriptors */ 224 size = rdesc_count * sizeof(struct xgbe_ring_desc); 225 226 ring->rdesc_count = rdesc_count; 227 ring->rdesc = xgbe_dma_alloc_node(pdata->dev, size, &ring->rdesc_dma, 228 ring->node); 229 if (!ring->rdesc) 230 return -ENOMEM; 231 232 /* Descriptor information */ 233 size = rdesc_count * sizeof(struct xgbe_ring_data); 234 235 ring->rdata = xgbe_alloc_node(size, ring->node); 236 if (!ring->rdata) 237 return -ENOMEM; 238 239 netif_dbg(pdata, drv, pdata->netdev, 240 "rdesc=%p, rdesc_dma=%pad, rdata=%p, node=%d\n", 241 ring->rdesc, &ring->rdesc_dma, ring->rdata, ring->node); 242 243 return 0; 244 } 245 246 static int xgbe_alloc_ring_resources(struct xgbe_prv_data *pdata) 247 { 248 struct xgbe_channel *channel; 249 unsigned int i; 250 int ret; 251 252 for (i = 0; i < pdata->channel_count; i++) { 253 channel = pdata->channel[i]; 254 netif_dbg(pdata, drv, pdata->netdev, "%s - Tx ring:\n", 255 channel->name); 256 257 ret = xgbe_init_ring(pdata, channel->tx_ring, 258 pdata->tx_desc_count); 259 if (ret) { 260 netdev_alert(pdata->netdev, 261 "error initializing Tx ring\n"); 262 goto err_ring; 263 } 264 265 netif_dbg(pdata, drv, pdata->netdev, "%s - Rx ring:\n", 266 channel->name); 267 268 ret = xgbe_init_ring(pdata, channel->rx_ring, 269 pdata->rx_desc_count); 270 if (ret) { 271 netdev_alert(pdata->netdev, 272 "error initializing Rx ring\n"); 273 goto err_ring; 274 } 275 } 276 277 return 0; 278 279 err_ring: 280 xgbe_free_ring_resources(pdata); 281 282 return ret; 283 } 284 285 static int xgbe_alloc_pages(struct xgbe_prv_data *pdata, 286 struct xgbe_page_alloc *pa, int alloc_order, 287 int node) 288 { 289 struct page *pages = NULL; 290 dma_addr_t pages_dma; 291 gfp_t gfp; 292 int order, ret; 293 294 again: 295 order = alloc_order; 296 297 /* Try to obtain pages, decreasing order if necessary */ 298 gfp = GFP_ATOMIC | __GFP_COLD | __GFP_COMP | __GFP_NOWARN; 299 while (order >= 0) { 300 pages = alloc_pages_node(node, gfp, order); 301 if (pages) 302 break; 303 304 order--; 305 } 306 307 /* If we couldn't get local pages, try getting from anywhere */ 308 if (!pages && (node != NUMA_NO_NODE)) { 309 node = NUMA_NO_NODE; 310 goto again; 311 } 312 313 if (!pages) 314 return -ENOMEM; 315 316 /* Map the pages */ 317 pages_dma = dma_map_page(pdata->dev, pages, 0, 318 PAGE_SIZE << order, DMA_FROM_DEVICE); 319 ret = dma_mapping_error(pdata->dev, pages_dma); 320 if (ret) { 321 put_page(pages); 322 return ret; 323 } 324 325 pa->pages = pages; 326 pa->pages_len = PAGE_SIZE << order; 327 pa->pages_offset = 0; 328 pa->pages_dma = pages_dma; 329 330 return 0; 331 } 332 333 static void xgbe_set_buffer_data(struct xgbe_buffer_data *bd, 334 struct xgbe_page_alloc *pa, 335 unsigned int len) 336 { 337 get_page(pa->pages); 338 bd->pa = *pa; 339 340 bd->dma_base = pa->pages_dma; 341 bd->dma_off = pa->pages_offset; 342 bd->dma_len = len; 343 344 pa->pages_offset += len; 345 if ((pa->pages_offset + len) > pa->pages_len) { 346 /* This data descriptor is responsible for unmapping page(s) */ 347 bd->pa_unmap = *pa; 348 349 /* Get a new allocation next time */ 350 pa->pages = NULL; 351 pa->pages_len = 0; 352 pa->pages_offset = 0; 353 pa->pages_dma = 0; 354 } 355 } 356 357 static int xgbe_map_rx_buffer(struct xgbe_prv_data *pdata, 358 struct xgbe_ring *ring, 359 struct xgbe_ring_data *rdata) 360 { 361 int ret; 362 363 if (!ring->rx_hdr_pa.pages) { 364 ret = xgbe_alloc_pages(pdata, &ring->rx_hdr_pa, 0, ring->node); 365 if (ret) 366 return ret; 367 } 368 369 if (!ring->rx_buf_pa.pages) { 370 ret = xgbe_alloc_pages(pdata, &ring->rx_buf_pa, 371 PAGE_ALLOC_COSTLY_ORDER, ring->node); 372 if (ret) 373 return ret; 374 } 375 376 /* Set up the header page info */ 377 xgbe_set_buffer_data(&rdata->rx.hdr, &ring->rx_hdr_pa, 378 XGBE_SKB_ALLOC_SIZE); 379 380 /* Set up the buffer page info */ 381 xgbe_set_buffer_data(&rdata->rx.buf, &ring->rx_buf_pa, 382 pdata->rx_buf_size); 383 384 return 0; 385 } 386 387 static void xgbe_wrapper_tx_descriptor_init(struct xgbe_prv_data *pdata) 388 { 389 struct xgbe_hw_if *hw_if = &pdata->hw_if; 390 struct xgbe_channel *channel; 391 struct xgbe_ring *ring; 392 struct xgbe_ring_data *rdata; 393 struct xgbe_ring_desc *rdesc; 394 dma_addr_t rdesc_dma; 395 unsigned int i, j; 396 397 DBGPR("-->xgbe_wrapper_tx_descriptor_init\n"); 398 399 for (i = 0; i < pdata->channel_count; i++) { 400 channel = pdata->channel[i]; 401 ring = channel->tx_ring; 402 if (!ring) 403 break; 404 405 rdesc = ring->rdesc; 406 rdesc_dma = ring->rdesc_dma; 407 408 for (j = 0; j < ring->rdesc_count; j++) { 409 rdata = XGBE_GET_DESC_DATA(ring, j); 410 411 rdata->rdesc = rdesc; 412 rdata->rdesc_dma = rdesc_dma; 413 414 rdesc++; 415 rdesc_dma += sizeof(struct xgbe_ring_desc); 416 } 417 418 ring->cur = 0; 419 ring->dirty = 0; 420 memset(&ring->tx, 0, sizeof(ring->tx)); 421 422 hw_if->tx_desc_init(channel); 423 } 424 425 DBGPR("<--xgbe_wrapper_tx_descriptor_init\n"); 426 } 427 428 static void xgbe_wrapper_rx_descriptor_init(struct xgbe_prv_data *pdata) 429 { 430 struct xgbe_hw_if *hw_if = &pdata->hw_if; 431 struct xgbe_channel *channel; 432 struct xgbe_ring *ring; 433 struct xgbe_ring_desc *rdesc; 434 struct xgbe_ring_data *rdata; 435 dma_addr_t rdesc_dma; 436 unsigned int i, j; 437 438 DBGPR("-->xgbe_wrapper_rx_descriptor_init\n"); 439 440 for (i = 0; i < pdata->channel_count; i++) { 441 channel = pdata->channel[i]; 442 ring = channel->rx_ring; 443 if (!ring) 444 break; 445 446 rdesc = ring->rdesc; 447 rdesc_dma = ring->rdesc_dma; 448 449 for (j = 0; j < ring->rdesc_count; j++) { 450 rdata = XGBE_GET_DESC_DATA(ring, j); 451 452 rdata->rdesc = rdesc; 453 rdata->rdesc_dma = rdesc_dma; 454 455 if (xgbe_map_rx_buffer(pdata, ring, rdata)) 456 break; 457 458 rdesc++; 459 rdesc_dma += sizeof(struct xgbe_ring_desc); 460 } 461 462 ring->cur = 0; 463 ring->dirty = 0; 464 465 hw_if->rx_desc_init(channel); 466 } 467 468 DBGPR("<--xgbe_wrapper_rx_descriptor_init\n"); 469 } 470 471 static void xgbe_unmap_rdata(struct xgbe_prv_data *pdata, 472 struct xgbe_ring_data *rdata) 473 { 474 if (rdata->skb_dma) { 475 if (rdata->mapped_as_page) { 476 dma_unmap_page(pdata->dev, rdata->skb_dma, 477 rdata->skb_dma_len, DMA_TO_DEVICE); 478 } else { 479 dma_unmap_single(pdata->dev, rdata->skb_dma, 480 rdata->skb_dma_len, DMA_TO_DEVICE); 481 } 482 rdata->skb_dma = 0; 483 rdata->skb_dma_len = 0; 484 } 485 486 if (rdata->skb) { 487 dev_kfree_skb_any(rdata->skb); 488 rdata->skb = NULL; 489 } 490 491 if (rdata->rx.hdr.pa.pages) 492 put_page(rdata->rx.hdr.pa.pages); 493 494 if (rdata->rx.hdr.pa_unmap.pages) { 495 dma_unmap_page(pdata->dev, rdata->rx.hdr.pa_unmap.pages_dma, 496 rdata->rx.hdr.pa_unmap.pages_len, 497 DMA_FROM_DEVICE); 498 put_page(rdata->rx.hdr.pa_unmap.pages); 499 } 500 501 if (rdata->rx.buf.pa.pages) 502 put_page(rdata->rx.buf.pa.pages); 503 504 if (rdata->rx.buf.pa_unmap.pages) { 505 dma_unmap_page(pdata->dev, rdata->rx.buf.pa_unmap.pages_dma, 506 rdata->rx.buf.pa_unmap.pages_len, 507 DMA_FROM_DEVICE); 508 put_page(rdata->rx.buf.pa_unmap.pages); 509 } 510 511 memset(&rdata->tx, 0, sizeof(rdata->tx)); 512 memset(&rdata->rx, 0, sizeof(rdata->rx)); 513 514 rdata->mapped_as_page = 0; 515 516 if (rdata->state_saved) { 517 rdata->state_saved = 0; 518 rdata->state.skb = NULL; 519 rdata->state.len = 0; 520 rdata->state.error = 0; 521 } 522 } 523 524 static int xgbe_map_tx_skb(struct xgbe_channel *channel, struct sk_buff *skb) 525 { 526 struct xgbe_prv_data *pdata = channel->pdata; 527 struct xgbe_ring *ring = channel->tx_ring; 528 struct xgbe_ring_data *rdata; 529 struct xgbe_packet_data *packet; 530 struct skb_frag_struct *frag; 531 dma_addr_t skb_dma; 532 unsigned int start_index, cur_index; 533 unsigned int offset, tso, vlan, datalen, len; 534 unsigned int i; 535 536 DBGPR("-->xgbe_map_tx_skb: cur = %d\n", ring->cur); 537 538 offset = 0; 539 start_index = ring->cur; 540 cur_index = ring->cur; 541 542 packet = &ring->packet_data; 543 packet->rdesc_count = 0; 544 packet->length = 0; 545 546 tso = XGMAC_GET_BITS(packet->attributes, TX_PACKET_ATTRIBUTES, 547 TSO_ENABLE); 548 vlan = XGMAC_GET_BITS(packet->attributes, TX_PACKET_ATTRIBUTES, 549 VLAN_CTAG); 550 551 /* Save space for a context descriptor if needed */ 552 if ((tso && (packet->mss != ring->tx.cur_mss)) || 553 (vlan && (packet->vlan_ctag != ring->tx.cur_vlan_ctag))) 554 cur_index++; 555 rdata = XGBE_GET_DESC_DATA(ring, cur_index); 556 557 if (tso) { 558 /* Map the TSO header */ 559 skb_dma = dma_map_single(pdata->dev, skb->data, 560 packet->header_len, DMA_TO_DEVICE); 561 if (dma_mapping_error(pdata->dev, skb_dma)) { 562 netdev_alert(pdata->netdev, "dma_map_single failed\n"); 563 goto err_out; 564 } 565 rdata->skb_dma = skb_dma; 566 rdata->skb_dma_len = packet->header_len; 567 netif_dbg(pdata, tx_queued, pdata->netdev, 568 "skb header: index=%u, dma=%pad, len=%u\n", 569 cur_index, &skb_dma, packet->header_len); 570 571 offset = packet->header_len; 572 573 packet->length += packet->header_len; 574 575 cur_index++; 576 rdata = XGBE_GET_DESC_DATA(ring, cur_index); 577 } 578 579 /* Map the (remainder of the) packet */ 580 for (datalen = skb_headlen(skb) - offset; datalen; ) { 581 len = min_t(unsigned int, datalen, XGBE_TX_MAX_BUF_SIZE); 582 583 skb_dma = dma_map_single(pdata->dev, skb->data + offset, len, 584 DMA_TO_DEVICE); 585 if (dma_mapping_error(pdata->dev, skb_dma)) { 586 netdev_alert(pdata->netdev, "dma_map_single failed\n"); 587 goto err_out; 588 } 589 rdata->skb_dma = skb_dma; 590 rdata->skb_dma_len = len; 591 netif_dbg(pdata, tx_queued, pdata->netdev, 592 "skb data: index=%u, dma=%pad, len=%u\n", 593 cur_index, &skb_dma, len); 594 595 datalen -= len; 596 offset += len; 597 598 packet->length += len; 599 600 cur_index++; 601 rdata = XGBE_GET_DESC_DATA(ring, cur_index); 602 } 603 604 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { 605 netif_dbg(pdata, tx_queued, pdata->netdev, 606 "mapping frag %u\n", i); 607 608 frag = &skb_shinfo(skb)->frags[i]; 609 offset = 0; 610 611 for (datalen = skb_frag_size(frag); datalen; ) { 612 len = min_t(unsigned int, datalen, 613 XGBE_TX_MAX_BUF_SIZE); 614 615 skb_dma = skb_frag_dma_map(pdata->dev, frag, offset, 616 len, DMA_TO_DEVICE); 617 if (dma_mapping_error(pdata->dev, skb_dma)) { 618 netdev_alert(pdata->netdev, 619 "skb_frag_dma_map failed\n"); 620 goto err_out; 621 } 622 rdata->skb_dma = skb_dma; 623 rdata->skb_dma_len = len; 624 rdata->mapped_as_page = 1; 625 netif_dbg(pdata, tx_queued, pdata->netdev, 626 "skb frag: index=%u, dma=%pad, len=%u\n", 627 cur_index, &skb_dma, len); 628 629 datalen -= len; 630 offset += len; 631 632 packet->length += len; 633 634 cur_index++; 635 rdata = XGBE_GET_DESC_DATA(ring, cur_index); 636 } 637 } 638 639 /* Save the skb address in the last entry. We always have some data 640 * that has been mapped so rdata is always advanced past the last 641 * piece of mapped data - use the entry pointed to by cur_index - 1. 642 */ 643 rdata = XGBE_GET_DESC_DATA(ring, cur_index - 1); 644 rdata->skb = skb; 645 646 /* Save the number of descriptor entries used */ 647 packet->rdesc_count = cur_index - start_index; 648 649 DBGPR("<--xgbe_map_tx_skb: count=%u\n", packet->rdesc_count); 650 651 return packet->rdesc_count; 652 653 err_out: 654 while (start_index < cur_index) { 655 rdata = XGBE_GET_DESC_DATA(ring, start_index++); 656 xgbe_unmap_rdata(pdata, rdata); 657 } 658 659 DBGPR("<--xgbe_map_tx_skb: count=0\n"); 660 661 return 0; 662 } 663 664 void xgbe_init_function_ptrs_desc(struct xgbe_desc_if *desc_if) 665 { 666 DBGPR("-->xgbe_init_function_ptrs_desc\n"); 667 668 desc_if->alloc_ring_resources = xgbe_alloc_ring_resources; 669 desc_if->free_ring_resources = xgbe_free_ring_resources; 670 desc_if->map_tx_skb = xgbe_map_tx_skb; 671 desc_if->map_rx_buffer = xgbe_map_rx_buffer; 672 desc_if->unmap_rdata = xgbe_unmap_rdata; 673 desc_if->wrapper_tx_desc_init = xgbe_wrapper_tx_descriptor_init; 674 desc_if->wrapper_rx_desc_init = xgbe_wrapper_rx_descriptor_init; 675 676 DBGPR("<--xgbe_init_function_ptrs_desc\n"); 677 } 678