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" 119 120 121 static void xgbe_unmap_skb(struct xgbe_prv_data *, struct xgbe_ring_data *); 122 123 static void xgbe_free_ring(struct xgbe_prv_data *pdata, 124 struct xgbe_ring *ring) 125 { 126 struct xgbe_ring_data *rdata; 127 unsigned int i; 128 129 if (!ring) 130 return; 131 132 if (ring->rdata) { 133 for (i = 0; i < ring->rdesc_count; i++) { 134 rdata = GET_DESC_DATA(ring, i); 135 xgbe_unmap_skb(pdata, rdata); 136 } 137 138 kfree(ring->rdata); 139 ring->rdata = NULL; 140 } 141 142 if (ring->rdesc) { 143 dma_free_coherent(pdata->dev, 144 (sizeof(struct xgbe_ring_desc) * 145 ring->rdesc_count), 146 ring->rdesc, ring->rdesc_dma); 147 ring->rdesc = NULL; 148 } 149 } 150 151 static void xgbe_free_ring_resources(struct xgbe_prv_data *pdata) 152 { 153 struct xgbe_channel *channel; 154 unsigned int i; 155 156 DBGPR("-->xgbe_free_ring_resources\n"); 157 158 channel = pdata->channel; 159 for (i = 0; i < pdata->channel_count; i++, channel++) { 160 xgbe_free_ring(pdata, channel->tx_ring); 161 xgbe_free_ring(pdata, channel->rx_ring); 162 } 163 164 DBGPR("<--xgbe_free_ring_resources\n"); 165 } 166 167 static int xgbe_init_ring(struct xgbe_prv_data *pdata, 168 struct xgbe_ring *ring, unsigned int rdesc_count) 169 { 170 DBGPR("-->xgbe_init_ring\n"); 171 172 if (!ring) 173 return 0; 174 175 /* Descriptors */ 176 ring->rdesc_count = rdesc_count; 177 ring->rdesc = dma_alloc_coherent(pdata->dev, 178 (sizeof(struct xgbe_ring_desc) * 179 rdesc_count), &ring->rdesc_dma, 180 GFP_KERNEL); 181 if (!ring->rdesc) 182 return -ENOMEM; 183 184 /* Descriptor information */ 185 ring->rdata = kcalloc(rdesc_count, sizeof(struct xgbe_ring_data), 186 GFP_KERNEL); 187 if (!ring->rdata) 188 return -ENOMEM; 189 190 DBGPR(" rdesc=0x%p, rdesc_dma=0x%llx, rdata=0x%p\n", 191 ring->rdesc, ring->rdesc_dma, ring->rdata); 192 193 DBGPR("<--xgbe_init_ring\n"); 194 195 return 0; 196 } 197 198 static int xgbe_alloc_ring_resources(struct xgbe_prv_data *pdata) 199 { 200 struct xgbe_channel *channel; 201 unsigned int i; 202 int ret; 203 204 DBGPR("-->xgbe_alloc_ring_resources\n"); 205 206 channel = pdata->channel; 207 for (i = 0; i < pdata->channel_count; i++, channel++) { 208 DBGPR(" %s - tx_ring:\n", channel->name); 209 ret = xgbe_init_ring(pdata, channel->tx_ring, 210 pdata->tx_desc_count); 211 if (ret) { 212 netdev_alert(pdata->netdev, 213 "error initializing Tx ring\n"); 214 goto err_ring; 215 } 216 217 DBGPR(" %s - rx_ring:\n", channel->name); 218 ret = xgbe_init_ring(pdata, channel->rx_ring, 219 pdata->rx_desc_count); 220 if (ret) { 221 netdev_alert(pdata->netdev, 222 "error initializing Tx ring\n"); 223 goto err_ring; 224 } 225 } 226 227 DBGPR("<--xgbe_alloc_ring_resources\n"); 228 229 return 0; 230 231 err_ring: 232 xgbe_free_ring_resources(pdata); 233 234 return ret; 235 } 236 237 static void xgbe_wrapper_tx_descriptor_init(struct xgbe_prv_data *pdata) 238 { 239 struct xgbe_hw_if *hw_if = &pdata->hw_if; 240 struct xgbe_channel *channel; 241 struct xgbe_ring *ring; 242 struct xgbe_ring_data *rdata; 243 struct xgbe_ring_desc *rdesc; 244 dma_addr_t rdesc_dma; 245 unsigned int i, j; 246 247 DBGPR("-->xgbe_wrapper_tx_descriptor_init\n"); 248 249 channel = pdata->channel; 250 for (i = 0; i < pdata->channel_count; i++, channel++) { 251 ring = channel->tx_ring; 252 if (!ring) 253 break; 254 255 rdesc = ring->rdesc; 256 rdesc_dma = ring->rdesc_dma; 257 258 for (j = 0; j < ring->rdesc_count; j++) { 259 rdata = GET_DESC_DATA(ring, j); 260 261 rdata->rdesc = rdesc; 262 rdata->rdesc_dma = rdesc_dma; 263 264 rdesc++; 265 rdesc_dma += sizeof(struct xgbe_ring_desc); 266 } 267 268 ring->cur = 0; 269 ring->dirty = 0; 270 ring->tx.queue_stopped = 0; 271 272 hw_if->tx_desc_init(channel); 273 } 274 275 DBGPR("<--xgbe_wrapper_tx_descriptor_init\n"); 276 } 277 278 static void xgbe_wrapper_rx_descriptor_init(struct xgbe_prv_data *pdata) 279 { 280 struct xgbe_hw_if *hw_if = &pdata->hw_if; 281 struct xgbe_channel *channel; 282 struct xgbe_ring *ring; 283 struct xgbe_ring_desc *rdesc; 284 struct xgbe_ring_data *rdata; 285 dma_addr_t rdesc_dma, skb_dma; 286 struct sk_buff *skb = NULL; 287 unsigned int i, j; 288 289 DBGPR("-->xgbe_wrapper_rx_descriptor_init\n"); 290 291 channel = pdata->channel; 292 for (i = 0; i < pdata->channel_count; i++, channel++) { 293 ring = channel->rx_ring; 294 if (!ring) 295 break; 296 297 rdesc = ring->rdesc; 298 rdesc_dma = ring->rdesc_dma; 299 300 for (j = 0; j < ring->rdesc_count; j++) { 301 rdata = GET_DESC_DATA(ring, j); 302 303 rdata->rdesc = rdesc; 304 rdata->rdesc_dma = rdesc_dma; 305 306 /* Allocate skb & assign to each rdesc */ 307 skb = dev_alloc_skb(pdata->rx_buf_size); 308 if (skb == NULL) 309 break; 310 skb_dma = dma_map_single(pdata->dev, skb->data, 311 pdata->rx_buf_size, 312 DMA_FROM_DEVICE); 313 if (dma_mapping_error(pdata->dev, skb_dma)) { 314 netdev_alert(pdata->netdev, 315 "failed to do the dma map\n"); 316 dev_kfree_skb_any(skb); 317 break; 318 } 319 rdata->skb = skb; 320 rdata->skb_dma = skb_dma; 321 rdata->skb_dma_len = pdata->rx_buf_size; 322 323 rdesc++; 324 rdesc_dma += sizeof(struct xgbe_ring_desc); 325 } 326 327 ring->cur = 0; 328 ring->dirty = 0; 329 ring->rx.realloc_index = 0; 330 ring->rx.realloc_threshold = 0; 331 332 hw_if->rx_desc_init(channel); 333 } 334 335 DBGPR("<--xgbe_wrapper_rx_descriptor_init\n"); 336 } 337 338 static void xgbe_unmap_skb(struct xgbe_prv_data *pdata, 339 struct xgbe_ring_data *rdata) 340 { 341 if (rdata->skb_dma) { 342 if (rdata->mapped_as_page) { 343 dma_unmap_page(pdata->dev, rdata->skb_dma, 344 rdata->skb_dma_len, DMA_TO_DEVICE); 345 } else { 346 dma_unmap_single(pdata->dev, rdata->skb_dma, 347 rdata->skb_dma_len, DMA_TO_DEVICE); 348 } 349 rdata->skb_dma = 0; 350 rdata->skb_dma_len = 0; 351 } 352 353 if (rdata->skb) { 354 dev_kfree_skb_any(rdata->skb); 355 rdata->skb = NULL; 356 } 357 358 rdata->tso_header = 0; 359 rdata->len = 0; 360 rdata->interrupt = 0; 361 rdata->mapped_as_page = 0; 362 } 363 364 static int xgbe_map_tx_skb(struct xgbe_channel *channel, struct sk_buff *skb) 365 { 366 struct xgbe_prv_data *pdata = channel->pdata; 367 struct xgbe_ring *ring = channel->tx_ring; 368 struct xgbe_ring_data *rdata; 369 struct xgbe_packet_data *packet; 370 struct skb_frag_struct *frag; 371 dma_addr_t skb_dma; 372 unsigned int start_index, cur_index; 373 unsigned int offset, tso, vlan, datalen, len; 374 unsigned int i; 375 376 DBGPR("-->xgbe_map_tx_skb: cur = %d\n", ring->cur); 377 378 offset = 0; 379 start_index = ring->cur; 380 cur_index = ring->cur; 381 382 packet = &ring->packet_data; 383 packet->rdesc_count = 0; 384 packet->length = 0; 385 386 tso = XGMAC_GET_BITS(packet->attributes, TX_PACKET_ATTRIBUTES, 387 TSO_ENABLE); 388 vlan = XGMAC_GET_BITS(packet->attributes, TX_PACKET_ATTRIBUTES, 389 VLAN_CTAG); 390 391 /* Save space for a context descriptor if needed */ 392 if ((tso && (packet->mss != ring->tx.cur_mss)) || 393 (vlan && (packet->vlan_ctag != ring->tx.cur_vlan_ctag))) 394 cur_index++; 395 rdata = GET_DESC_DATA(ring, cur_index); 396 397 if (tso) { 398 DBGPR(" TSO packet\n"); 399 400 /* Map the TSO header */ 401 skb_dma = dma_map_single(pdata->dev, skb->data, 402 packet->header_len, DMA_TO_DEVICE); 403 if (dma_mapping_error(pdata->dev, skb_dma)) { 404 netdev_alert(pdata->netdev, "dma_map_single failed\n"); 405 goto err_out; 406 } 407 rdata->skb_dma = skb_dma; 408 rdata->skb_dma_len = packet->header_len; 409 rdata->tso_header = 1; 410 411 offset = packet->header_len; 412 413 packet->length += packet->header_len; 414 415 cur_index++; 416 rdata = GET_DESC_DATA(ring, cur_index); 417 } 418 419 /* Map the (remainder of the) packet */ 420 for (datalen = skb_headlen(skb) - offset; datalen; ) { 421 len = min_t(unsigned int, datalen, TX_MAX_BUF_SIZE); 422 423 skb_dma = dma_map_single(pdata->dev, skb->data + offset, len, 424 DMA_TO_DEVICE); 425 if (dma_mapping_error(pdata->dev, skb_dma)) { 426 netdev_alert(pdata->netdev, "dma_map_single failed\n"); 427 goto err_out; 428 } 429 rdata->skb_dma = skb_dma; 430 rdata->skb_dma_len = len; 431 DBGPR(" skb data: index=%u, dma=0x%llx, len=%u\n", 432 cur_index, skb_dma, len); 433 434 datalen -= len; 435 offset += len; 436 437 packet->length += len; 438 439 cur_index++; 440 rdata = GET_DESC_DATA(ring, cur_index); 441 } 442 443 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { 444 DBGPR(" mapping frag %u\n", i); 445 446 frag = &skb_shinfo(skb)->frags[i]; 447 offset = 0; 448 449 for (datalen = skb_frag_size(frag); datalen; ) { 450 len = min_t(unsigned int, datalen, TX_MAX_BUF_SIZE); 451 452 skb_dma = skb_frag_dma_map(pdata->dev, frag, offset, 453 len, DMA_TO_DEVICE); 454 if (dma_mapping_error(pdata->dev, skb_dma)) { 455 netdev_alert(pdata->netdev, 456 "skb_frag_dma_map failed\n"); 457 goto err_out; 458 } 459 rdata->skb_dma = skb_dma; 460 rdata->skb_dma_len = len; 461 rdata->mapped_as_page = 1; 462 DBGPR(" skb data: index=%u, dma=0x%llx, len=%u\n", 463 cur_index, skb_dma, len); 464 465 datalen -= len; 466 offset += len; 467 468 packet->length += len; 469 470 cur_index++; 471 rdata = GET_DESC_DATA(ring, cur_index); 472 } 473 } 474 475 /* Save the skb address in the last entry */ 476 rdata->skb = skb; 477 478 /* Save the number of descriptor entries used */ 479 packet->rdesc_count = cur_index - start_index; 480 481 DBGPR("<--xgbe_map_tx_skb: count=%u\n", packet->rdesc_count); 482 483 return packet->rdesc_count; 484 485 err_out: 486 while (start_index < cur_index) { 487 rdata = GET_DESC_DATA(ring, start_index++); 488 xgbe_unmap_skb(pdata, rdata); 489 } 490 491 DBGPR("<--xgbe_map_tx_skb: count=0\n"); 492 493 return 0; 494 } 495 496 static void xgbe_realloc_skb(struct xgbe_channel *channel) 497 { 498 struct xgbe_prv_data *pdata = channel->pdata; 499 struct xgbe_hw_if *hw_if = &pdata->hw_if; 500 struct xgbe_ring *ring = channel->rx_ring; 501 struct xgbe_ring_data *rdata; 502 struct sk_buff *skb = NULL; 503 dma_addr_t skb_dma; 504 int i; 505 506 DBGPR("-->xgbe_realloc_skb: rx_ring->rx.realloc_index = %u\n", 507 ring->rx.realloc_index); 508 509 for (i = 0; i < ring->dirty; i++) { 510 rdata = GET_DESC_DATA(ring, ring->rx.realloc_index); 511 512 /* Reset rdata values */ 513 xgbe_unmap_skb(pdata, rdata); 514 515 /* Allocate skb & assign to each rdesc */ 516 skb = dev_alloc_skb(pdata->rx_buf_size); 517 if (skb == NULL) { 518 netdev_alert(pdata->netdev, 519 "failed to allocate skb\n"); 520 break; 521 } 522 skb_dma = dma_map_single(pdata->dev, skb->data, 523 pdata->rx_buf_size, DMA_FROM_DEVICE); 524 if (dma_mapping_error(pdata->dev, skb_dma)) { 525 netdev_alert(pdata->netdev, 526 "failed to do the dma map\n"); 527 dev_kfree_skb_any(skb); 528 break; 529 } 530 rdata->skb = skb; 531 rdata->skb_dma = skb_dma; 532 rdata->skb_dma_len = pdata->rx_buf_size; 533 534 hw_if->rx_desc_reset(rdata); 535 536 ring->rx.realloc_index++; 537 } 538 ring->dirty = 0; 539 540 DBGPR("<--xgbe_realloc_skb\n"); 541 } 542 543 void xgbe_init_function_ptrs_desc(struct xgbe_desc_if *desc_if) 544 { 545 DBGPR("-->xgbe_init_function_ptrs_desc\n"); 546 547 desc_if->alloc_ring_resources = xgbe_alloc_ring_resources; 548 desc_if->free_ring_resources = xgbe_free_ring_resources; 549 desc_if->map_tx_skb = xgbe_map_tx_skb; 550 desc_if->realloc_skb = xgbe_realloc_skb; 551 desc_if->unmap_skb = xgbe_unmap_skb; 552 desc_if->wrapper_tx_desc_init = xgbe_wrapper_tx_descriptor_init; 553 desc_if->wrapper_rx_desc_init = xgbe_wrapper_rx_descriptor_init; 554 555 DBGPR("<--xgbe_init_function_ptrs_desc\n"); 556 } 557