1 /* 2 * Copyright (c) 2007, 2008, 2009 QLogic Corporation. All rights reserved. 3 * 4 * This software is available to you under a choice of one of two 5 * licenses. You may choose to be licensed under the terms of the GNU 6 * General Public License (GPL) Version 2, available from the file 7 * COPYING in the main directory of this source tree, or the 8 * OpenIB.org BSD license below: 9 * 10 * Redistribution and use in source and binary forms, with or 11 * without modification, are permitted provided that the following 12 * conditions are met: 13 * 14 * - Redistributions of source code must retain the above 15 * copyright notice, this list of conditions and the following 16 * disclaimer. 17 * 18 * - Redistributions in binary form must reproduce the above 19 * copyright notice, this list of conditions and the following 20 * disclaimer in the documentation and/or other materials 21 * provided with the distribution. 22 * 23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 30 * SOFTWARE. 31 */ 32 #include <linux/mm.h> 33 #include <linux/types.h> 34 #include <linux/device.h> 35 #include <linux/dmapool.h> 36 #include <linux/slab.h> 37 #include <linux/list.h> 38 #include <linux/highmem.h> 39 #include <linux/io.h> 40 #include <linux/uio.h> 41 #include <linux/rbtree.h> 42 #include <linux/spinlock.h> 43 #include <linux/delay.h> 44 45 #include "qib.h" 46 #include "qib_user_sdma.h" 47 48 /* minimum size of header */ 49 #define QIB_USER_SDMA_MIN_HEADER_LENGTH 64 50 /* expected size of headers (for dma_pool) */ 51 #define QIB_USER_SDMA_EXP_HEADER_LENGTH 64 52 /* attempt to drain the queue for 5secs */ 53 #define QIB_USER_SDMA_DRAIN_TIMEOUT 250 54 55 /* 56 * track how many times a process open this driver. 57 */ 58 static struct rb_root qib_user_sdma_rb_root = RB_ROOT; 59 60 struct qib_user_sdma_rb_node { 61 struct rb_node node; 62 int refcount; 63 pid_t pid; 64 }; 65 66 struct qib_user_sdma_pkt { 67 struct list_head list; /* list element */ 68 69 u8 tiddma; /* if this is NEW tid-sdma */ 70 u8 largepkt; /* this is large pkt from kmalloc */ 71 u16 frag_size; /* frag size used by PSM */ 72 u16 index; /* last header index or push index */ 73 u16 naddr; /* dimension of addr (1..3) ... */ 74 u16 addrlimit; /* addr array size */ 75 u16 tidsmidx; /* current tidsm index */ 76 u16 tidsmcount; /* tidsm array item count */ 77 u16 payload_size; /* payload size so far for header */ 78 u32 bytes_togo; /* bytes for processing */ 79 u32 counter; /* sdma pkts queued counter for this entry */ 80 struct qib_tid_session_member *tidsm; /* tid session member array */ 81 struct qib_user_sdma_queue *pq; /* which pq this pkt belongs to */ 82 u64 added; /* global descq number of entries */ 83 84 struct { 85 u16 offset; /* offset for kvaddr, addr */ 86 u16 length; /* length in page */ 87 u16 first_desc; /* first desc */ 88 u16 last_desc; /* last desc */ 89 u16 put_page; /* should we put_page? */ 90 u16 dma_mapped; /* is page dma_mapped? */ 91 u16 dma_length; /* for dma_unmap_page() */ 92 u16 padding; 93 struct page *page; /* may be NULL (coherent mem) */ 94 void *kvaddr; /* FIXME: only for pio hack */ 95 dma_addr_t addr; 96 } addr[4]; /* max pages, any more and we coalesce */ 97 }; 98 99 struct qib_user_sdma_queue { 100 /* 101 * pkts sent to dma engine are queued on this 102 * list head. the type of the elements of this 103 * list are struct qib_user_sdma_pkt... 104 */ 105 struct list_head sent; 106 107 /* 108 * Because above list will be accessed by both process and 109 * signal handler, we need a spinlock for it. 110 */ 111 spinlock_t sent_lock ____cacheline_aligned_in_smp; 112 113 /* headers with expected length are allocated from here... */ 114 char header_cache_name[64]; 115 struct dma_pool *header_cache; 116 117 /* packets are allocated from the slab cache... */ 118 char pkt_slab_name[64]; 119 struct kmem_cache *pkt_slab; 120 121 /* as packets go on the queued queue, they are counted... */ 122 u32 counter; 123 u32 sent_counter; 124 /* pending packets, not sending yet */ 125 u32 num_pending; 126 /* sending packets, not complete yet */ 127 u32 num_sending; 128 /* global descq number of entry of last sending packet */ 129 u64 added; 130 131 /* dma page table */ 132 struct rb_root dma_pages_root; 133 134 struct qib_user_sdma_rb_node *sdma_rb_node; 135 136 /* protect everything above... */ 137 struct mutex lock; 138 }; 139 140 static struct qib_user_sdma_rb_node * 141 qib_user_sdma_rb_search(struct rb_root *root, pid_t pid) 142 { 143 struct qib_user_sdma_rb_node *sdma_rb_node; 144 struct rb_node *node = root->rb_node; 145 146 while (node) { 147 sdma_rb_node = rb_entry(node, struct qib_user_sdma_rb_node, 148 node); 149 if (pid < sdma_rb_node->pid) 150 node = node->rb_left; 151 else if (pid > sdma_rb_node->pid) 152 node = node->rb_right; 153 else 154 return sdma_rb_node; 155 } 156 return NULL; 157 } 158 159 static int 160 qib_user_sdma_rb_insert(struct rb_root *root, struct qib_user_sdma_rb_node *new) 161 { 162 struct rb_node **node = &(root->rb_node); 163 struct rb_node *parent = NULL; 164 struct qib_user_sdma_rb_node *got; 165 166 while (*node) { 167 got = rb_entry(*node, struct qib_user_sdma_rb_node, node); 168 parent = *node; 169 if (new->pid < got->pid) 170 node = &((*node)->rb_left); 171 else if (new->pid > got->pid) 172 node = &((*node)->rb_right); 173 else 174 return 0; 175 } 176 177 rb_link_node(&new->node, parent, node); 178 rb_insert_color(&new->node, root); 179 return 1; 180 } 181 182 struct qib_user_sdma_queue * 183 qib_user_sdma_queue_create(struct device *dev, int unit, int ctxt, int sctxt) 184 { 185 struct qib_user_sdma_queue *pq = 186 kmalloc(sizeof(struct qib_user_sdma_queue), GFP_KERNEL); 187 struct qib_user_sdma_rb_node *sdma_rb_node; 188 189 if (!pq) 190 goto done; 191 192 pq->counter = 0; 193 pq->sent_counter = 0; 194 pq->num_pending = 0; 195 pq->num_sending = 0; 196 pq->added = 0; 197 pq->sdma_rb_node = NULL; 198 199 INIT_LIST_HEAD(&pq->sent); 200 spin_lock_init(&pq->sent_lock); 201 mutex_init(&pq->lock); 202 203 snprintf(pq->pkt_slab_name, sizeof(pq->pkt_slab_name), 204 "qib-user-sdma-pkts-%u-%02u.%02u", unit, ctxt, sctxt); 205 pq->pkt_slab = kmem_cache_create(pq->pkt_slab_name, 206 sizeof(struct qib_user_sdma_pkt), 207 0, 0, NULL); 208 209 if (!pq->pkt_slab) 210 goto err_kfree; 211 212 snprintf(pq->header_cache_name, sizeof(pq->header_cache_name), 213 "qib-user-sdma-headers-%u-%02u.%02u", unit, ctxt, sctxt); 214 pq->header_cache = dma_pool_create(pq->header_cache_name, 215 dev, 216 QIB_USER_SDMA_EXP_HEADER_LENGTH, 217 4, 0); 218 if (!pq->header_cache) 219 goto err_slab; 220 221 pq->dma_pages_root = RB_ROOT; 222 223 sdma_rb_node = qib_user_sdma_rb_search(&qib_user_sdma_rb_root, 224 current->pid); 225 if (sdma_rb_node) { 226 sdma_rb_node->refcount++; 227 } else { 228 sdma_rb_node = kmalloc(sizeof( 229 struct qib_user_sdma_rb_node), GFP_KERNEL); 230 if (!sdma_rb_node) 231 goto err_rb; 232 233 sdma_rb_node->refcount = 1; 234 sdma_rb_node->pid = current->pid; 235 236 qib_user_sdma_rb_insert(&qib_user_sdma_rb_root, sdma_rb_node); 237 } 238 pq->sdma_rb_node = sdma_rb_node; 239 240 goto done; 241 242 err_rb: 243 dma_pool_destroy(pq->header_cache); 244 err_slab: 245 kmem_cache_destroy(pq->pkt_slab); 246 err_kfree: 247 kfree(pq); 248 pq = NULL; 249 250 done: 251 return pq; 252 } 253 254 static void qib_user_sdma_init_frag(struct qib_user_sdma_pkt *pkt, 255 int i, u16 offset, u16 len, 256 u16 first_desc, u16 last_desc, 257 u16 put_page, u16 dma_mapped, 258 struct page *page, void *kvaddr, 259 dma_addr_t dma_addr, u16 dma_length) 260 { 261 pkt->addr[i].offset = offset; 262 pkt->addr[i].length = len; 263 pkt->addr[i].first_desc = first_desc; 264 pkt->addr[i].last_desc = last_desc; 265 pkt->addr[i].put_page = put_page; 266 pkt->addr[i].dma_mapped = dma_mapped; 267 pkt->addr[i].page = page; 268 pkt->addr[i].kvaddr = kvaddr; 269 pkt->addr[i].addr = dma_addr; 270 pkt->addr[i].dma_length = dma_length; 271 } 272 273 static void *qib_user_sdma_alloc_header(struct qib_user_sdma_queue *pq, 274 size_t len, dma_addr_t *dma_addr) 275 { 276 void *hdr; 277 278 if (len == QIB_USER_SDMA_EXP_HEADER_LENGTH) 279 hdr = dma_pool_alloc(pq->header_cache, GFP_KERNEL, 280 dma_addr); 281 else 282 hdr = NULL; 283 284 if (!hdr) { 285 hdr = kmalloc(len, GFP_KERNEL); 286 if (!hdr) 287 return NULL; 288 289 *dma_addr = 0; 290 } 291 292 return hdr; 293 } 294 295 static int qib_user_sdma_page_to_frags(const struct qib_devdata *dd, 296 struct qib_user_sdma_queue *pq, 297 struct qib_user_sdma_pkt *pkt, 298 struct page *page, u16 put, 299 u16 offset, u16 len, void *kvaddr) 300 { 301 __le16 *pbc16; 302 void *pbcvaddr; 303 struct qib_message_header *hdr; 304 u16 newlen, pbclen, lastdesc, dma_mapped; 305 u32 vcto; 306 union qib_seqnum seqnum; 307 dma_addr_t pbcdaddr; 308 dma_addr_t dma_addr = 309 dma_map_page(&dd->pcidev->dev, 310 page, offset, len, DMA_TO_DEVICE); 311 int ret = 0; 312 313 if (dma_mapping_error(&dd->pcidev->dev, dma_addr)) { 314 /* 315 * dma mapping error, pkt has not managed 316 * this page yet, return the page here so 317 * the caller can ignore this page. 318 */ 319 if (put) { 320 put_page(page); 321 } else { 322 /* coalesce case */ 323 kunmap(page); 324 __free_page(page); 325 } 326 ret = -ENOMEM; 327 goto done; 328 } 329 offset = 0; 330 dma_mapped = 1; 331 332 333 next_fragment: 334 335 /* 336 * In tid-sdma, the transfer length is restricted by 337 * receiver side current tid page length. 338 */ 339 if (pkt->tiddma && len > pkt->tidsm[pkt->tidsmidx].length) 340 newlen = pkt->tidsm[pkt->tidsmidx].length; 341 else 342 newlen = len; 343 344 /* 345 * Then the transfer length is restricted by MTU. 346 * the last descriptor flag is determined by: 347 * 1. the current packet is at frag size length. 348 * 2. the current tid page is done if tid-sdma. 349 * 3. there is no more byte togo if sdma. 350 */ 351 lastdesc = 0; 352 if ((pkt->payload_size + newlen) >= pkt->frag_size) { 353 newlen = pkt->frag_size - pkt->payload_size; 354 lastdesc = 1; 355 } else if (pkt->tiddma) { 356 if (newlen == pkt->tidsm[pkt->tidsmidx].length) 357 lastdesc = 1; 358 } else { 359 if (newlen == pkt->bytes_togo) 360 lastdesc = 1; 361 } 362 363 /* fill the next fragment in this page */ 364 qib_user_sdma_init_frag(pkt, pkt->naddr, /* index */ 365 offset, newlen, /* offset, len */ 366 0, lastdesc, /* first last desc */ 367 put, dma_mapped, /* put page, dma mapped */ 368 page, kvaddr, /* struct page, virt addr */ 369 dma_addr, len); /* dma addr, dma length */ 370 pkt->bytes_togo -= newlen; 371 pkt->payload_size += newlen; 372 pkt->naddr++; 373 if (pkt->naddr == pkt->addrlimit) { 374 ret = -EFAULT; 375 goto done; 376 } 377 378 /* If there is no more byte togo. (lastdesc==1) */ 379 if (pkt->bytes_togo == 0) { 380 /* The packet is done, header is not dma mapped yet. 381 * it should be from kmalloc */ 382 if (!pkt->addr[pkt->index].addr) { 383 pkt->addr[pkt->index].addr = 384 dma_map_single(&dd->pcidev->dev, 385 pkt->addr[pkt->index].kvaddr, 386 pkt->addr[pkt->index].dma_length, 387 DMA_TO_DEVICE); 388 if (dma_mapping_error(&dd->pcidev->dev, 389 pkt->addr[pkt->index].addr)) { 390 ret = -ENOMEM; 391 goto done; 392 } 393 pkt->addr[pkt->index].dma_mapped = 1; 394 } 395 396 goto done; 397 } 398 399 /* If tid-sdma, advance tid info. */ 400 if (pkt->tiddma) { 401 pkt->tidsm[pkt->tidsmidx].length -= newlen; 402 if (pkt->tidsm[pkt->tidsmidx].length) { 403 pkt->tidsm[pkt->tidsmidx].offset += newlen; 404 } else { 405 pkt->tidsmidx++; 406 if (pkt->tidsmidx == pkt->tidsmcount) { 407 ret = -EFAULT; 408 goto done; 409 } 410 } 411 } 412 413 /* 414 * If this is NOT the last descriptor. (newlen==len) 415 * the current packet is not done yet, but the current 416 * send side page is done. 417 */ 418 if (lastdesc == 0) 419 goto done; 420 421 /* 422 * If running this driver under PSM with message size 423 * fitting into one transfer unit, it is not possible 424 * to pass this line. otherwise, it is a buggggg. 425 */ 426 427 /* 428 * Since the current packet is done, and there are more 429 * bytes togo, we need to create a new sdma header, copying 430 * from previous sdma header and modify both. 431 */ 432 pbclen = pkt->addr[pkt->index].length; 433 pbcvaddr = qib_user_sdma_alloc_header(pq, pbclen, &pbcdaddr); 434 if (!pbcvaddr) { 435 ret = -ENOMEM; 436 goto done; 437 } 438 /* Copy the previous sdma header to new sdma header */ 439 pbc16 = (__le16 *)pkt->addr[pkt->index].kvaddr; 440 memcpy(pbcvaddr, pbc16, pbclen); 441 442 /* Modify the previous sdma header */ 443 hdr = (struct qib_message_header *)&pbc16[4]; 444 445 /* New pbc length */ 446 pbc16[0] = cpu_to_le16(le16_to_cpu(pbc16[0])-(pkt->bytes_togo>>2)); 447 448 /* New packet length */ 449 hdr->lrh[2] = cpu_to_be16(le16_to_cpu(pbc16[0])); 450 451 if (pkt->tiddma) { 452 /* turn on the header suppression */ 453 hdr->iph.pkt_flags = 454 cpu_to_le16(le16_to_cpu(hdr->iph.pkt_flags)|0x2); 455 /* turn off ACK_REQ: 0x04 and EXPECTED_DONE: 0x20 */ 456 hdr->flags &= ~(0x04|0x20); 457 } else { 458 /* turn off extra bytes: 20-21 bits */ 459 hdr->bth[0] = cpu_to_be32(be32_to_cpu(hdr->bth[0])&0xFFCFFFFF); 460 /* turn off ACK_REQ: 0x04 */ 461 hdr->flags &= ~(0x04); 462 } 463 464 /* New kdeth checksum */ 465 vcto = le32_to_cpu(hdr->iph.ver_ctxt_tid_offset); 466 hdr->iph.chksum = cpu_to_le16(QIB_LRH_BTH + 467 be16_to_cpu(hdr->lrh[2]) - 468 ((vcto>>16)&0xFFFF) - (vcto&0xFFFF) - 469 le16_to_cpu(hdr->iph.pkt_flags)); 470 471 /* The packet is done, header is not dma mapped yet. 472 * it should be from kmalloc */ 473 if (!pkt->addr[pkt->index].addr) { 474 pkt->addr[pkt->index].addr = 475 dma_map_single(&dd->pcidev->dev, 476 pkt->addr[pkt->index].kvaddr, 477 pkt->addr[pkt->index].dma_length, 478 DMA_TO_DEVICE); 479 if (dma_mapping_error(&dd->pcidev->dev, 480 pkt->addr[pkt->index].addr)) { 481 ret = -ENOMEM; 482 goto done; 483 } 484 pkt->addr[pkt->index].dma_mapped = 1; 485 } 486 487 /* Modify the new sdma header */ 488 pbc16 = (__le16 *)pbcvaddr; 489 hdr = (struct qib_message_header *)&pbc16[4]; 490 491 /* New pbc length */ 492 pbc16[0] = cpu_to_le16(le16_to_cpu(pbc16[0])-(pkt->payload_size>>2)); 493 494 /* New packet length */ 495 hdr->lrh[2] = cpu_to_be16(le16_to_cpu(pbc16[0])); 496 497 if (pkt->tiddma) { 498 /* Set new tid and offset for new sdma header */ 499 hdr->iph.ver_ctxt_tid_offset = cpu_to_le32( 500 (le32_to_cpu(hdr->iph.ver_ctxt_tid_offset)&0xFF000000) + 501 (pkt->tidsm[pkt->tidsmidx].tid<<QLOGIC_IB_I_TID_SHIFT) + 502 (pkt->tidsm[pkt->tidsmidx].offset>>2)); 503 } else { 504 /* Middle protocol new packet offset */ 505 hdr->uwords[2] += pkt->payload_size; 506 } 507 508 /* New kdeth checksum */ 509 vcto = le32_to_cpu(hdr->iph.ver_ctxt_tid_offset); 510 hdr->iph.chksum = cpu_to_le16(QIB_LRH_BTH + 511 be16_to_cpu(hdr->lrh[2]) - 512 ((vcto>>16)&0xFFFF) - (vcto&0xFFFF) - 513 le16_to_cpu(hdr->iph.pkt_flags)); 514 515 /* Next sequence number in new sdma header */ 516 seqnum.val = be32_to_cpu(hdr->bth[2]); 517 if (pkt->tiddma) 518 seqnum.seq++; 519 else 520 seqnum.pkt++; 521 hdr->bth[2] = cpu_to_be32(seqnum.val); 522 523 /* Init new sdma header. */ 524 qib_user_sdma_init_frag(pkt, pkt->naddr, /* index */ 525 0, pbclen, /* offset, len */ 526 1, 0, /* first last desc */ 527 0, 0, /* put page, dma mapped */ 528 NULL, pbcvaddr, /* struct page, virt addr */ 529 pbcdaddr, pbclen); /* dma addr, dma length */ 530 pkt->index = pkt->naddr; 531 pkt->payload_size = 0; 532 pkt->naddr++; 533 if (pkt->naddr == pkt->addrlimit) { 534 ret = -EFAULT; 535 goto done; 536 } 537 538 /* Prepare for next fragment in this page */ 539 if (newlen != len) { 540 if (dma_mapped) { 541 put = 0; 542 dma_mapped = 0; 543 page = NULL; 544 kvaddr = NULL; 545 } 546 len -= newlen; 547 offset += newlen; 548 549 goto next_fragment; 550 } 551 552 done: 553 return ret; 554 } 555 556 /* we've too many pages in the iovec, coalesce to a single page */ 557 static int qib_user_sdma_coalesce(const struct qib_devdata *dd, 558 struct qib_user_sdma_queue *pq, 559 struct qib_user_sdma_pkt *pkt, 560 const struct iovec *iov, 561 unsigned long niov) 562 { 563 int ret = 0; 564 struct page *page = alloc_page(GFP_KERNEL); 565 void *mpage_save; 566 char *mpage; 567 int i; 568 int len = 0; 569 570 if (!page) { 571 ret = -ENOMEM; 572 goto done; 573 } 574 575 mpage = kmap(page); 576 mpage_save = mpage; 577 for (i = 0; i < niov; i++) { 578 int cfur; 579 580 cfur = copy_from_user(mpage, 581 iov[i].iov_base, iov[i].iov_len); 582 if (cfur) { 583 ret = -EFAULT; 584 goto free_unmap; 585 } 586 587 mpage += iov[i].iov_len; 588 len += iov[i].iov_len; 589 } 590 591 ret = qib_user_sdma_page_to_frags(dd, pq, pkt, 592 page, 0, 0, len, mpage_save); 593 goto done; 594 595 free_unmap: 596 kunmap(page); 597 __free_page(page); 598 done: 599 return ret; 600 } 601 602 /* 603 * How many pages in this iovec element? 604 */ 605 static int qib_user_sdma_num_pages(const struct iovec *iov) 606 { 607 const unsigned long addr = (unsigned long) iov->iov_base; 608 const unsigned long len = iov->iov_len; 609 const unsigned long spage = addr & PAGE_MASK; 610 const unsigned long epage = (addr + len - 1) & PAGE_MASK; 611 612 return 1 + ((epage - spage) >> PAGE_SHIFT); 613 } 614 615 static void qib_user_sdma_free_pkt_frag(struct device *dev, 616 struct qib_user_sdma_queue *pq, 617 struct qib_user_sdma_pkt *pkt, 618 int frag) 619 { 620 const int i = frag; 621 622 if (pkt->addr[i].page) { 623 /* only user data has page */ 624 if (pkt->addr[i].dma_mapped) 625 dma_unmap_page(dev, 626 pkt->addr[i].addr, 627 pkt->addr[i].dma_length, 628 DMA_TO_DEVICE); 629 630 if (pkt->addr[i].kvaddr) 631 kunmap(pkt->addr[i].page); 632 633 if (pkt->addr[i].put_page) 634 put_page(pkt->addr[i].page); 635 else 636 __free_page(pkt->addr[i].page); 637 } else if (pkt->addr[i].kvaddr) { 638 /* for headers */ 639 if (pkt->addr[i].dma_mapped) { 640 /* from kmalloc & dma mapped */ 641 dma_unmap_single(dev, 642 pkt->addr[i].addr, 643 pkt->addr[i].dma_length, 644 DMA_TO_DEVICE); 645 kfree(pkt->addr[i].kvaddr); 646 } else if (pkt->addr[i].addr) { 647 /* free coherent mem from cache... */ 648 dma_pool_free(pq->header_cache, 649 pkt->addr[i].kvaddr, pkt->addr[i].addr); 650 } else { 651 /* from kmalloc but not dma mapped */ 652 kfree(pkt->addr[i].kvaddr); 653 } 654 } 655 } 656 657 /* return number of pages pinned... */ 658 static int qib_user_sdma_pin_pages(const struct qib_devdata *dd, 659 struct qib_user_sdma_queue *pq, 660 struct qib_user_sdma_pkt *pkt, 661 unsigned long addr, int tlen, int npages) 662 { 663 struct page *pages[8]; 664 int i, j; 665 int ret = 0; 666 667 while (npages) { 668 if (npages > 8) 669 j = 8; 670 else 671 j = npages; 672 673 ret = get_user_pages_fast(addr, j, FOLL_LONGTERM, pages); 674 if (ret != j) { 675 i = 0; 676 j = ret; 677 ret = -ENOMEM; 678 goto free_pages; 679 } 680 681 for (i = 0; i < j; i++) { 682 /* map the pages... */ 683 unsigned long fofs = addr & ~PAGE_MASK; 684 int flen = ((fofs + tlen) > PAGE_SIZE) ? 685 (PAGE_SIZE - fofs) : tlen; 686 687 ret = qib_user_sdma_page_to_frags(dd, pq, pkt, 688 pages[i], 1, fofs, flen, NULL); 689 if (ret < 0) { 690 /* current page has beed taken 691 * care of inside above call. 692 */ 693 i++; 694 goto free_pages; 695 } 696 697 addr += flen; 698 tlen -= flen; 699 } 700 701 npages -= j; 702 } 703 704 goto done; 705 706 /* if error, return all pages not managed by pkt */ 707 free_pages: 708 while (i < j) 709 put_page(pages[i++]); 710 711 done: 712 return ret; 713 } 714 715 static int qib_user_sdma_pin_pkt(const struct qib_devdata *dd, 716 struct qib_user_sdma_queue *pq, 717 struct qib_user_sdma_pkt *pkt, 718 const struct iovec *iov, 719 unsigned long niov) 720 { 721 int ret = 0; 722 unsigned long idx; 723 724 for (idx = 0; idx < niov; idx++) { 725 const int npages = qib_user_sdma_num_pages(iov + idx); 726 const unsigned long addr = (unsigned long) iov[idx].iov_base; 727 728 ret = qib_user_sdma_pin_pages(dd, pq, pkt, addr, 729 iov[idx].iov_len, npages); 730 if (ret < 0) 731 goto free_pkt; 732 } 733 734 goto done; 735 736 free_pkt: 737 /* we need to ignore the first entry here */ 738 for (idx = 1; idx < pkt->naddr; idx++) 739 qib_user_sdma_free_pkt_frag(&dd->pcidev->dev, pq, pkt, idx); 740 741 /* need to dma unmap the first entry, this is to restore to 742 * the original state so that caller can free the memory in 743 * error condition. Caller does not know if dma mapped or not*/ 744 if (pkt->addr[0].dma_mapped) { 745 dma_unmap_single(&dd->pcidev->dev, 746 pkt->addr[0].addr, 747 pkt->addr[0].dma_length, 748 DMA_TO_DEVICE); 749 pkt->addr[0].addr = 0; 750 pkt->addr[0].dma_mapped = 0; 751 } 752 753 done: 754 return ret; 755 } 756 757 static int qib_user_sdma_init_payload(const struct qib_devdata *dd, 758 struct qib_user_sdma_queue *pq, 759 struct qib_user_sdma_pkt *pkt, 760 const struct iovec *iov, 761 unsigned long niov, int npages) 762 { 763 int ret = 0; 764 765 if (pkt->frag_size == pkt->bytes_togo && 766 npages >= ARRAY_SIZE(pkt->addr)) 767 ret = qib_user_sdma_coalesce(dd, pq, pkt, iov, niov); 768 else 769 ret = qib_user_sdma_pin_pkt(dd, pq, pkt, iov, niov); 770 771 return ret; 772 } 773 774 /* free a packet list -- return counter value of last packet */ 775 static void qib_user_sdma_free_pkt_list(struct device *dev, 776 struct qib_user_sdma_queue *pq, 777 struct list_head *list) 778 { 779 struct qib_user_sdma_pkt *pkt, *pkt_next; 780 781 list_for_each_entry_safe(pkt, pkt_next, list, list) { 782 int i; 783 784 for (i = 0; i < pkt->naddr; i++) 785 qib_user_sdma_free_pkt_frag(dev, pq, pkt, i); 786 787 if (pkt->largepkt) 788 kfree(pkt); 789 else 790 kmem_cache_free(pq->pkt_slab, pkt); 791 } 792 INIT_LIST_HEAD(list); 793 } 794 795 /* 796 * copy headers, coalesce etc -- pq->lock must be held 797 * 798 * we queue all the packets to list, returning the 799 * number of bytes total. list must be empty initially, 800 * as, if there is an error we clean it... 801 */ 802 static int qib_user_sdma_queue_pkts(const struct qib_devdata *dd, 803 struct qib_pportdata *ppd, 804 struct qib_user_sdma_queue *pq, 805 const struct iovec *iov, 806 unsigned long niov, 807 struct list_head *list, 808 int *maxpkts, int *ndesc) 809 { 810 unsigned long idx = 0; 811 int ret = 0; 812 int npkts = 0; 813 __le32 *pbc; 814 dma_addr_t dma_addr; 815 struct qib_user_sdma_pkt *pkt = NULL; 816 size_t len; 817 size_t nw; 818 u32 counter = pq->counter; 819 u16 frag_size; 820 821 while (idx < niov && npkts < *maxpkts) { 822 const unsigned long addr = (unsigned long) iov[idx].iov_base; 823 const unsigned long idx_save = idx; 824 unsigned pktnw; 825 unsigned pktnwc; 826 int nfrags = 0; 827 int npages = 0; 828 int bytes_togo = 0; 829 int tiddma = 0; 830 int cfur; 831 832 len = iov[idx].iov_len; 833 nw = len >> 2; 834 835 if (len < QIB_USER_SDMA_MIN_HEADER_LENGTH || 836 len > PAGE_SIZE || len & 3 || addr & 3) { 837 ret = -EINVAL; 838 goto free_list; 839 } 840 841 pbc = qib_user_sdma_alloc_header(pq, len, &dma_addr); 842 if (!pbc) { 843 ret = -ENOMEM; 844 goto free_list; 845 } 846 847 cfur = copy_from_user(pbc, iov[idx].iov_base, len); 848 if (cfur) { 849 ret = -EFAULT; 850 goto free_pbc; 851 } 852 853 /* 854 * This assignment is a bit strange. it's because the 855 * the pbc counts the number of 32 bit words in the full 856 * packet _except_ the first word of the pbc itself... 857 */ 858 pktnwc = nw - 1; 859 860 /* 861 * pktnw computation yields the number of 32 bit words 862 * that the caller has indicated in the PBC. note that 863 * this is one less than the total number of words that 864 * goes to the send DMA engine as the first 32 bit word 865 * of the PBC itself is not counted. Armed with this count, 866 * we can verify that the packet is consistent with the 867 * iovec lengths. 868 */ 869 pktnw = le32_to_cpu(*pbc) & 0xFFFF; 870 if (pktnw < pktnwc) { 871 ret = -EINVAL; 872 goto free_pbc; 873 } 874 875 idx++; 876 while (pktnwc < pktnw && idx < niov) { 877 const size_t slen = iov[idx].iov_len; 878 const unsigned long faddr = 879 (unsigned long) iov[idx].iov_base; 880 881 if (slen & 3 || faddr & 3 || !slen) { 882 ret = -EINVAL; 883 goto free_pbc; 884 } 885 886 npages += qib_user_sdma_num_pages(&iov[idx]); 887 888 bytes_togo += slen; 889 pktnwc += slen >> 2; 890 idx++; 891 nfrags++; 892 } 893 894 if (pktnwc != pktnw) { 895 ret = -EINVAL; 896 goto free_pbc; 897 } 898 899 frag_size = ((le32_to_cpu(*pbc))>>16) & 0xFFFF; 900 if (((frag_size ? frag_size : bytes_togo) + len) > 901 ppd->ibmaxlen) { 902 ret = -EINVAL; 903 goto free_pbc; 904 } 905 906 if (frag_size) { 907 int pktsize, tidsmsize, n; 908 909 n = npages*((2*PAGE_SIZE/frag_size)+1); 910 pktsize = sizeof(*pkt) + sizeof(pkt->addr[0])*n; 911 912 /* 913 * Determine if this is tid-sdma or just sdma. 914 */ 915 tiddma = (((le32_to_cpu(pbc[7])>> 916 QLOGIC_IB_I_TID_SHIFT)& 917 QLOGIC_IB_I_TID_MASK) != 918 QLOGIC_IB_I_TID_MASK); 919 920 if (tiddma) 921 tidsmsize = iov[idx].iov_len; 922 else 923 tidsmsize = 0; 924 925 pkt = kmalloc(pktsize+tidsmsize, GFP_KERNEL); 926 if (!pkt) { 927 ret = -ENOMEM; 928 goto free_pbc; 929 } 930 pkt->largepkt = 1; 931 pkt->frag_size = frag_size; 932 pkt->addrlimit = n + ARRAY_SIZE(pkt->addr); 933 934 if (tiddma) { 935 char *tidsm = (char *)pkt + pktsize; 936 937 cfur = copy_from_user(tidsm, 938 iov[idx].iov_base, tidsmsize); 939 if (cfur) { 940 ret = -EFAULT; 941 goto free_pkt; 942 } 943 pkt->tidsm = 944 (struct qib_tid_session_member *)tidsm; 945 pkt->tidsmcount = tidsmsize/ 946 sizeof(struct qib_tid_session_member); 947 pkt->tidsmidx = 0; 948 idx++; 949 } 950 951 /* 952 * pbc 'fill1' field is borrowed to pass frag size, 953 * we need to clear it after picking frag size, the 954 * hardware requires this field to be zero. 955 */ 956 *pbc = cpu_to_le32(le32_to_cpu(*pbc) & 0x0000FFFF); 957 } else { 958 pkt = kmem_cache_alloc(pq->pkt_slab, GFP_KERNEL); 959 if (!pkt) { 960 ret = -ENOMEM; 961 goto free_pbc; 962 } 963 pkt->largepkt = 0; 964 pkt->frag_size = bytes_togo; 965 pkt->addrlimit = ARRAY_SIZE(pkt->addr); 966 } 967 pkt->bytes_togo = bytes_togo; 968 pkt->payload_size = 0; 969 pkt->counter = counter; 970 pkt->tiddma = tiddma; 971 972 /* setup the first header */ 973 qib_user_sdma_init_frag(pkt, 0, /* index */ 974 0, len, /* offset, len */ 975 1, 0, /* first last desc */ 976 0, 0, /* put page, dma mapped */ 977 NULL, pbc, /* struct page, virt addr */ 978 dma_addr, len); /* dma addr, dma length */ 979 pkt->index = 0; 980 pkt->naddr = 1; 981 982 if (nfrags) { 983 ret = qib_user_sdma_init_payload(dd, pq, pkt, 984 iov + idx_save + 1, 985 nfrags, npages); 986 if (ret < 0) 987 goto free_pkt; 988 } else { 989 /* since there is no payload, mark the 990 * header as the last desc. */ 991 pkt->addr[0].last_desc = 1; 992 993 if (dma_addr == 0) { 994 /* 995 * the header is not dma mapped yet. 996 * it should be from kmalloc. 997 */ 998 dma_addr = dma_map_single(&dd->pcidev->dev, 999 pbc, len, DMA_TO_DEVICE); 1000 if (dma_mapping_error(&dd->pcidev->dev, 1001 dma_addr)) { 1002 ret = -ENOMEM; 1003 goto free_pkt; 1004 } 1005 pkt->addr[0].addr = dma_addr; 1006 pkt->addr[0].dma_mapped = 1; 1007 } 1008 } 1009 1010 counter++; 1011 npkts++; 1012 pkt->pq = pq; 1013 pkt->index = 0; /* reset index for push on hw */ 1014 *ndesc += pkt->naddr; 1015 1016 list_add_tail(&pkt->list, list); 1017 } 1018 1019 *maxpkts = npkts; 1020 ret = idx; 1021 goto done; 1022 1023 free_pkt: 1024 if (pkt->largepkt) 1025 kfree(pkt); 1026 else 1027 kmem_cache_free(pq->pkt_slab, pkt); 1028 free_pbc: 1029 if (dma_addr) 1030 dma_pool_free(pq->header_cache, pbc, dma_addr); 1031 else 1032 kfree(pbc); 1033 free_list: 1034 qib_user_sdma_free_pkt_list(&dd->pcidev->dev, pq, list); 1035 done: 1036 return ret; 1037 } 1038 1039 static void qib_user_sdma_set_complete_counter(struct qib_user_sdma_queue *pq, 1040 u32 c) 1041 { 1042 pq->sent_counter = c; 1043 } 1044 1045 /* try to clean out queue -- needs pq->lock */ 1046 static int qib_user_sdma_queue_clean(struct qib_pportdata *ppd, 1047 struct qib_user_sdma_queue *pq) 1048 { 1049 struct qib_devdata *dd = ppd->dd; 1050 struct list_head free_list; 1051 struct qib_user_sdma_pkt *pkt; 1052 struct qib_user_sdma_pkt *pkt_prev; 1053 unsigned long flags; 1054 int ret = 0; 1055 1056 if (!pq->num_sending) 1057 return 0; 1058 1059 INIT_LIST_HEAD(&free_list); 1060 1061 /* 1062 * We need this spin lock here because interrupt handler 1063 * might modify this list in qib_user_sdma_send_desc(), also 1064 * we can not get interrupted, otherwise it is a deadlock. 1065 */ 1066 spin_lock_irqsave(&pq->sent_lock, flags); 1067 list_for_each_entry_safe(pkt, pkt_prev, &pq->sent, list) { 1068 s64 descd = ppd->sdma_descq_removed - pkt->added; 1069 1070 if (descd < 0) 1071 break; 1072 1073 list_move_tail(&pkt->list, &free_list); 1074 1075 /* one more packet cleaned */ 1076 ret++; 1077 pq->num_sending--; 1078 } 1079 spin_unlock_irqrestore(&pq->sent_lock, flags); 1080 1081 if (!list_empty(&free_list)) { 1082 u32 counter; 1083 1084 pkt = list_entry(free_list.prev, 1085 struct qib_user_sdma_pkt, list); 1086 counter = pkt->counter; 1087 1088 qib_user_sdma_free_pkt_list(&dd->pcidev->dev, pq, &free_list); 1089 qib_user_sdma_set_complete_counter(pq, counter); 1090 } 1091 1092 return ret; 1093 } 1094 1095 void qib_user_sdma_queue_destroy(struct qib_user_sdma_queue *pq) 1096 { 1097 if (!pq) 1098 return; 1099 1100 pq->sdma_rb_node->refcount--; 1101 if (pq->sdma_rb_node->refcount == 0) { 1102 rb_erase(&pq->sdma_rb_node->node, &qib_user_sdma_rb_root); 1103 kfree(pq->sdma_rb_node); 1104 } 1105 dma_pool_destroy(pq->header_cache); 1106 kmem_cache_destroy(pq->pkt_slab); 1107 kfree(pq); 1108 } 1109 1110 /* clean descriptor queue, returns > 0 if some elements cleaned */ 1111 static int qib_user_sdma_hwqueue_clean(struct qib_pportdata *ppd) 1112 { 1113 int ret; 1114 unsigned long flags; 1115 1116 spin_lock_irqsave(&ppd->sdma_lock, flags); 1117 ret = qib_sdma_make_progress(ppd); 1118 spin_unlock_irqrestore(&ppd->sdma_lock, flags); 1119 1120 return ret; 1121 } 1122 1123 /* we're in close, drain packets so that we can cleanup successfully... */ 1124 void qib_user_sdma_queue_drain(struct qib_pportdata *ppd, 1125 struct qib_user_sdma_queue *pq) 1126 { 1127 struct qib_devdata *dd = ppd->dd; 1128 unsigned long flags; 1129 int i; 1130 1131 if (!pq) 1132 return; 1133 1134 for (i = 0; i < QIB_USER_SDMA_DRAIN_TIMEOUT; i++) { 1135 mutex_lock(&pq->lock); 1136 if (!pq->num_pending && !pq->num_sending) { 1137 mutex_unlock(&pq->lock); 1138 break; 1139 } 1140 qib_user_sdma_hwqueue_clean(ppd); 1141 qib_user_sdma_queue_clean(ppd, pq); 1142 mutex_unlock(&pq->lock); 1143 msleep(20); 1144 } 1145 1146 if (pq->num_pending || pq->num_sending) { 1147 struct qib_user_sdma_pkt *pkt; 1148 struct qib_user_sdma_pkt *pkt_prev; 1149 struct list_head free_list; 1150 1151 mutex_lock(&pq->lock); 1152 spin_lock_irqsave(&ppd->sdma_lock, flags); 1153 /* 1154 * Since we hold sdma_lock, it is safe without sent_lock. 1155 */ 1156 if (pq->num_pending) { 1157 list_for_each_entry_safe(pkt, pkt_prev, 1158 &ppd->sdma_userpending, list) { 1159 if (pkt->pq == pq) { 1160 list_move_tail(&pkt->list, &pq->sent); 1161 pq->num_pending--; 1162 pq->num_sending++; 1163 } 1164 } 1165 } 1166 spin_unlock_irqrestore(&ppd->sdma_lock, flags); 1167 1168 qib_dev_err(dd, "user sdma lists not empty: forcing!\n"); 1169 INIT_LIST_HEAD(&free_list); 1170 list_splice_init(&pq->sent, &free_list); 1171 pq->num_sending = 0; 1172 qib_user_sdma_free_pkt_list(&dd->pcidev->dev, pq, &free_list); 1173 mutex_unlock(&pq->lock); 1174 } 1175 } 1176 1177 static inline __le64 qib_sdma_make_desc0(u8 gen, 1178 u64 addr, u64 dwlen, u64 dwoffset) 1179 { 1180 return cpu_to_le64(/* SDmaPhyAddr[31:0] */ 1181 ((addr & 0xfffffffcULL) << 32) | 1182 /* SDmaGeneration[1:0] */ 1183 ((gen & 3ULL) << 30) | 1184 /* SDmaDwordCount[10:0] */ 1185 ((dwlen & 0x7ffULL) << 16) | 1186 /* SDmaBufOffset[12:2] */ 1187 (dwoffset & 0x7ffULL)); 1188 } 1189 1190 static inline __le64 qib_sdma_make_first_desc0(__le64 descq) 1191 { 1192 return descq | cpu_to_le64(1ULL << 12); 1193 } 1194 1195 static inline __le64 qib_sdma_make_last_desc0(__le64 descq) 1196 { 1197 /* last */ /* dma head */ 1198 return descq | cpu_to_le64(1ULL << 11 | 1ULL << 13); 1199 } 1200 1201 static inline __le64 qib_sdma_make_desc1(u64 addr) 1202 { 1203 /* SDmaPhyAddr[47:32] */ 1204 return cpu_to_le64(addr >> 32); 1205 } 1206 1207 static void qib_user_sdma_send_frag(struct qib_pportdata *ppd, 1208 struct qib_user_sdma_pkt *pkt, int idx, 1209 unsigned ofs, u16 tail, u8 gen) 1210 { 1211 const u64 addr = (u64) pkt->addr[idx].addr + 1212 (u64) pkt->addr[idx].offset; 1213 const u64 dwlen = (u64) pkt->addr[idx].length / 4; 1214 __le64 *descqp; 1215 __le64 descq0; 1216 1217 descqp = &ppd->sdma_descq[tail].qw[0]; 1218 1219 descq0 = qib_sdma_make_desc0(gen, addr, dwlen, ofs); 1220 if (pkt->addr[idx].first_desc) 1221 descq0 = qib_sdma_make_first_desc0(descq0); 1222 if (pkt->addr[idx].last_desc) { 1223 descq0 = qib_sdma_make_last_desc0(descq0); 1224 if (ppd->sdma_intrequest) { 1225 descq0 |= cpu_to_le64(1ULL << 15); 1226 ppd->sdma_intrequest = 0; 1227 } 1228 } 1229 1230 descqp[0] = descq0; 1231 descqp[1] = qib_sdma_make_desc1(addr); 1232 } 1233 1234 void qib_user_sdma_send_desc(struct qib_pportdata *ppd, 1235 struct list_head *pktlist) 1236 { 1237 struct qib_devdata *dd = ppd->dd; 1238 u16 nfree, nsent; 1239 u16 tail, tail_c; 1240 u8 gen, gen_c; 1241 1242 nfree = qib_sdma_descq_freecnt(ppd); 1243 if (!nfree) 1244 return; 1245 1246 retry: 1247 nsent = 0; 1248 tail_c = tail = ppd->sdma_descq_tail; 1249 gen_c = gen = ppd->sdma_generation; 1250 while (!list_empty(pktlist)) { 1251 struct qib_user_sdma_pkt *pkt = 1252 list_entry(pktlist->next, struct qib_user_sdma_pkt, 1253 list); 1254 int i, j, c = 0; 1255 unsigned ofs = 0; 1256 u16 dtail = tail; 1257 1258 for (i = pkt->index; i < pkt->naddr && nfree; i++) { 1259 qib_user_sdma_send_frag(ppd, pkt, i, ofs, tail, gen); 1260 ofs += pkt->addr[i].length >> 2; 1261 1262 if (++tail == ppd->sdma_descq_cnt) { 1263 tail = 0; 1264 ++gen; 1265 ppd->sdma_intrequest = 1; 1266 } else if (tail == (ppd->sdma_descq_cnt>>1)) { 1267 ppd->sdma_intrequest = 1; 1268 } 1269 nfree--; 1270 if (pkt->addr[i].last_desc == 0) 1271 continue; 1272 1273 /* 1274 * If the packet is >= 2KB mtu equivalent, we 1275 * have to use the large buffers, and have to 1276 * mark each descriptor as part of a large 1277 * buffer packet. 1278 */ 1279 if (ofs > dd->piosize2kmax_dwords) { 1280 for (j = pkt->index; j <= i; j++) { 1281 ppd->sdma_descq[dtail].qw[0] |= 1282 cpu_to_le64(1ULL << 14); 1283 if (++dtail == ppd->sdma_descq_cnt) 1284 dtail = 0; 1285 } 1286 } 1287 c += i + 1 - pkt->index; 1288 pkt->index = i + 1; /* index for next first */ 1289 tail_c = dtail = tail; 1290 gen_c = gen; 1291 ofs = 0; /* reset for next packet */ 1292 } 1293 1294 ppd->sdma_descq_added += c; 1295 nsent += c; 1296 if (pkt->index == pkt->naddr) { 1297 pkt->added = ppd->sdma_descq_added; 1298 pkt->pq->added = pkt->added; 1299 pkt->pq->num_pending--; 1300 spin_lock(&pkt->pq->sent_lock); 1301 pkt->pq->num_sending++; 1302 list_move_tail(&pkt->list, &pkt->pq->sent); 1303 spin_unlock(&pkt->pq->sent_lock); 1304 } 1305 if (!nfree || (nsent<<2) > ppd->sdma_descq_cnt) 1306 break; 1307 } 1308 1309 /* advance the tail on the chip if necessary */ 1310 if (ppd->sdma_descq_tail != tail_c) { 1311 ppd->sdma_generation = gen_c; 1312 dd->f_sdma_update_tail(ppd, tail_c); 1313 } 1314 1315 if (nfree && !list_empty(pktlist)) 1316 goto retry; 1317 } 1318 1319 /* pq->lock must be held, get packets on the wire... */ 1320 static int qib_user_sdma_push_pkts(struct qib_pportdata *ppd, 1321 struct qib_user_sdma_queue *pq, 1322 struct list_head *pktlist, int count) 1323 { 1324 unsigned long flags; 1325 1326 if (unlikely(!(ppd->lflags & QIBL_LINKACTIVE))) 1327 return -ECOMM; 1328 1329 /* non-blocking mode */ 1330 if (pq->sdma_rb_node->refcount > 1) { 1331 spin_lock_irqsave(&ppd->sdma_lock, flags); 1332 if (unlikely(!__qib_sdma_running(ppd))) { 1333 spin_unlock_irqrestore(&ppd->sdma_lock, flags); 1334 return -ECOMM; 1335 } 1336 pq->num_pending += count; 1337 list_splice_tail_init(pktlist, &ppd->sdma_userpending); 1338 qib_user_sdma_send_desc(ppd, &ppd->sdma_userpending); 1339 spin_unlock_irqrestore(&ppd->sdma_lock, flags); 1340 return 0; 1341 } 1342 1343 /* In this case, descriptors from this process are not 1344 * linked to ppd pending queue, interrupt handler 1345 * won't update this process, it is OK to directly 1346 * modify without sdma lock. 1347 */ 1348 1349 1350 pq->num_pending += count; 1351 /* 1352 * Blocking mode for single rail process, we must 1353 * release/regain sdma_lock to give other process 1354 * chance to make progress. This is important for 1355 * performance. 1356 */ 1357 do { 1358 spin_lock_irqsave(&ppd->sdma_lock, flags); 1359 if (unlikely(!__qib_sdma_running(ppd))) { 1360 spin_unlock_irqrestore(&ppd->sdma_lock, flags); 1361 return -ECOMM; 1362 } 1363 qib_user_sdma_send_desc(ppd, pktlist); 1364 if (!list_empty(pktlist)) 1365 qib_sdma_make_progress(ppd); 1366 spin_unlock_irqrestore(&ppd->sdma_lock, flags); 1367 } while (!list_empty(pktlist)); 1368 1369 return 0; 1370 } 1371 1372 int qib_user_sdma_writev(struct qib_ctxtdata *rcd, 1373 struct qib_user_sdma_queue *pq, 1374 const struct iovec *iov, 1375 unsigned long dim) 1376 { 1377 struct qib_devdata *dd = rcd->dd; 1378 struct qib_pportdata *ppd = rcd->ppd; 1379 int ret = 0; 1380 struct list_head list; 1381 int npkts = 0; 1382 1383 INIT_LIST_HEAD(&list); 1384 1385 mutex_lock(&pq->lock); 1386 1387 /* why not -ECOMM like qib_user_sdma_push_pkts() below? */ 1388 if (!qib_sdma_running(ppd)) 1389 goto done_unlock; 1390 1391 /* if I have packets not complete yet */ 1392 if (pq->added > ppd->sdma_descq_removed) 1393 qib_user_sdma_hwqueue_clean(ppd); 1394 /* if I have complete packets to be freed */ 1395 if (pq->num_sending) 1396 qib_user_sdma_queue_clean(ppd, pq); 1397 1398 while (dim) { 1399 int mxp = 1; 1400 int ndesc = 0; 1401 1402 ret = qib_user_sdma_queue_pkts(dd, ppd, pq, 1403 iov, dim, &list, &mxp, &ndesc); 1404 if (ret < 0) 1405 goto done_unlock; 1406 else { 1407 dim -= ret; 1408 iov += ret; 1409 } 1410 1411 /* force packets onto the sdma hw queue... */ 1412 if (!list_empty(&list)) { 1413 /* 1414 * Lazily clean hw queue. 1415 */ 1416 if (qib_sdma_descq_freecnt(ppd) < ndesc) { 1417 qib_user_sdma_hwqueue_clean(ppd); 1418 if (pq->num_sending) 1419 qib_user_sdma_queue_clean(ppd, pq); 1420 } 1421 1422 ret = qib_user_sdma_push_pkts(ppd, pq, &list, mxp); 1423 if (ret < 0) 1424 goto done_unlock; 1425 else { 1426 npkts += mxp; 1427 pq->counter += mxp; 1428 } 1429 } 1430 } 1431 1432 done_unlock: 1433 if (!list_empty(&list)) 1434 qib_user_sdma_free_pkt_list(&dd->pcidev->dev, pq, &list); 1435 mutex_unlock(&pq->lock); 1436 1437 return (ret < 0) ? ret : npkts; 1438 } 1439 1440 int qib_user_sdma_make_progress(struct qib_pportdata *ppd, 1441 struct qib_user_sdma_queue *pq) 1442 { 1443 int ret = 0; 1444 1445 mutex_lock(&pq->lock); 1446 qib_user_sdma_hwqueue_clean(ppd); 1447 ret = qib_user_sdma_queue_clean(ppd, pq); 1448 mutex_unlock(&pq->lock); 1449 1450 return ret; 1451 } 1452 1453 u32 qib_user_sdma_complete_counter(const struct qib_user_sdma_queue *pq) 1454 { 1455 return pq ? pq->sent_counter : 0; 1456 } 1457 1458 u32 qib_user_sdma_inflight_counter(struct qib_user_sdma_queue *pq) 1459 { 1460 return pq ? pq->counter : 0; 1461 } 1462