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1// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
2/*
3 * Copyright(c) 2020 - 2023 Cornelis Networks, Inc.
4 * Copyright(c) 2015 - 2018 Intel Corporation.
5 */
6
7#include <linux/mm.h>
8#include <linux/types.h>
9#include <linux/device.h>
10#include <linux/dmapool.h>
11#include <linux/slab.h>
12#include <linux/list.h>
13#include <linux/highmem.h>
14#include <linux/io.h>
15#include <linux/uio.h>
16#include <linux/rbtree.h>
17#include <linux/spinlock.h>
18#include <linux/delay.h>
19#include <linux/kthread.h>
20#include <linux/mmu_context.h>
21#include <linux/module.h>
22#include <linux/vmalloc.h>
23#include <linux/string.h>
24
25#include "hfi.h"
26#include "sdma.h"
27#include "user_sdma.h"
28#include "verbs.h" /* for the headers */
29#include "common.h" /* for struct hfi1_tid_info */
30#include "trace.h"
31
32static uint hfi1_sdma_comp_ring_size = 128;
33module_param_named(sdma_comp_size, hfi1_sdma_comp_ring_size, uint, S_IRUGO);
34MODULE_PARM_DESC(sdma_comp_size, "Size of User SDMA completion ring. Default: 128");
35
36static unsigned initial_pkt_count = 8;
37
38static int user_sdma_send_pkts(struct user_sdma_request *req, u16 maxpkts);
39static void user_sdma_txreq_cb(struct sdma_txreq *txreq, int status);
40static inline void pq_update(struct hfi1_user_sdma_pkt_q *pq);
41static void user_sdma_free_request(struct user_sdma_request *req);
42static int check_header_template(struct user_sdma_request *req,
43 struct hfi1_pkt_header *hdr, u32 lrhlen,
44 u32 datalen);
45static int set_txreq_header(struct user_sdma_request *req,
46 struct user_sdma_txreq *tx, u32 datalen);
47static int set_txreq_header_ahg(struct user_sdma_request *req,
48 struct user_sdma_txreq *tx, u32 len);
49static inline void set_comp_state(struct hfi1_user_sdma_pkt_q *pq,
50 struct hfi1_user_sdma_comp_q *cq,
51 u16 idx, enum hfi1_sdma_comp_state state,
52 int ret);
53static inline u32 set_pkt_bth_psn(__be32 bthpsn, u8 expct, u32 frags);
54static inline u32 get_lrh_len(struct hfi1_pkt_header, u32 len);
55
56static int defer_packet_queue(
57 struct sdma_engine *sde,
58 struct iowait_work *wait,
59 struct sdma_txreq *txreq,
60 uint seq,
61 bool pkts_sent);
62static void activate_packet_queue(struct iowait *wait, int reason);
63
64static int defer_packet_queue(
65 struct sdma_engine *sde,
66 struct iowait_work *wait,
67 struct sdma_txreq *txreq,
68 uint seq,
69 bool pkts_sent)
70{
71 struct hfi1_user_sdma_pkt_q *pq =
72 container_of(wait->iow, struct hfi1_user_sdma_pkt_q, busy);
73
74 write_seqlock(&sde->waitlock);
75 trace_hfi1_usdma_defer(pq, sde, &pq->busy);
76 if (sdma_progress(sde, seq, txreq))
77 goto eagain;
78 /*
79 * We are assuming that if the list is enqueued somewhere, it
80 * is to the dmawait list since that is the only place where
81 * it is supposed to be enqueued.
82 */
83 xchg(&pq->state, SDMA_PKT_Q_DEFERRED);
84 if (list_empty(&pq->busy.list)) {
85 pq->busy.lock = &sde->waitlock;
86 iowait_get_priority(&pq->busy);
87 iowait_queue(pkts_sent, &pq->busy, &sde->dmawait);
88 }
89 write_sequnlock(&sde->waitlock);
90 return -EBUSY;
91eagain:
92 write_sequnlock(&sde->waitlock);
93 return -EAGAIN;
94}
95
96static void activate_packet_queue(struct iowait *wait, int reason)
97{
98 struct hfi1_user_sdma_pkt_q *pq =
99 container_of(wait, struct hfi1_user_sdma_pkt_q, busy);
100
101 trace_hfi1_usdma_activate(pq, wait, reason);
102 xchg(&pq->state, SDMA_PKT_Q_ACTIVE);
103 wake_up(&wait->wait_dma);
104};
105
106int hfi1_user_sdma_alloc_queues(struct hfi1_ctxtdata *uctxt,
107 struct hfi1_filedata *fd)
108{
109 int ret = -ENOMEM;
110 char buf[64];
111 struct hfi1_devdata *dd;
112 struct hfi1_user_sdma_comp_q *cq;
113 struct hfi1_user_sdma_pkt_q *pq;
114
115 if (!uctxt || !fd)
116 return -EBADF;
117
118 if (!hfi1_sdma_comp_ring_size)
119 return -EINVAL;
120
121 dd = uctxt->dd;
122
123 pq = kzalloc(sizeof(*pq), GFP_KERNEL);
124 if (!pq)
125 return -ENOMEM;
126 pq->dd = dd;
127 pq->ctxt = uctxt->ctxt;
128 pq->subctxt = fd->subctxt;
129 pq->n_max_reqs = hfi1_sdma_comp_ring_size;
130 atomic_set(&pq->n_reqs, 0);
131 init_waitqueue_head(&pq->wait);
132 atomic_set(&pq->n_locked, 0);
133
134 iowait_init(&pq->busy, 0, NULL, NULL, defer_packet_queue,
135 activate_packet_queue, NULL, NULL);
136 pq->reqidx = 0;
137
138 pq->reqs = kcalloc(hfi1_sdma_comp_ring_size,
139 sizeof(*pq->reqs),
140 GFP_KERNEL);
141 if (!pq->reqs)
142 goto pq_reqs_nomem;
143
144 pq->req_in_use = bitmap_zalloc(hfi1_sdma_comp_ring_size, GFP_KERNEL);
145 if (!pq->req_in_use)
146 goto pq_reqs_no_in_use;
147
148 snprintf(buf, 64, "txreq-kmem-cache-%u-%u-%u", dd->unit, uctxt->ctxt,
149 fd->subctxt);
150 pq->txreq_cache = kmem_cache_create(buf,
151 sizeof(struct user_sdma_txreq),
152 L1_CACHE_BYTES,
153 SLAB_HWCACHE_ALIGN,
154 NULL);
155 if (!pq->txreq_cache) {
156 dd_dev_err(dd, "[%u] Failed to allocate TxReq cache\n",
157 uctxt->ctxt);
158 goto pq_txreq_nomem;
159 }
160
161 cq = kzalloc(sizeof(*cq), GFP_KERNEL);
162 if (!cq)
163 goto cq_nomem;
164
165 cq->comps = vmalloc_user(PAGE_ALIGN(sizeof(*cq->comps)
166 * hfi1_sdma_comp_ring_size));
167 if (!cq->comps)
168 goto cq_comps_nomem;
169
170 cq->nentries = hfi1_sdma_comp_ring_size;
171
172 ret = hfi1_init_system_pinning(pq);
173 if (ret)
174 goto pq_mmu_fail;
175
176 rcu_assign_pointer(fd->pq, pq);
177 fd->cq = cq;
178
179 return 0;
180
181pq_mmu_fail:
182 vfree(cq->comps);
183cq_comps_nomem:
184 kfree(cq);
185cq_nomem:
186 kmem_cache_destroy(pq->txreq_cache);
187pq_txreq_nomem:
188 bitmap_free(pq->req_in_use);
189pq_reqs_no_in_use:
190 kfree(pq->reqs);
191pq_reqs_nomem:
192 kfree(pq);
193
194 return ret;
195}
196
197static void flush_pq_iowait(struct hfi1_user_sdma_pkt_q *pq)
198{
199 unsigned long flags;
200 seqlock_t *lock = pq->busy.lock;
201
202 if (!lock)
203 return;
204 write_seqlock_irqsave(lock, flags);
205 if (!list_empty(&pq->busy.list)) {
206 list_del_init(&pq->busy.list);
207 pq->busy.lock = NULL;
208 }
209 write_sequnlock_irqrestore(lock, flags);
210}
211
212int hfi1_user_sdma_free_queues(struct hfi1_filedata *fd,
213 struct hfi1_ctxtdata *uctxt)
214{
215 struct hfi1_user_sdma_pkt_q *pq;
216
217 trace_hfi1_sdma_user_free_queues(uctxt->dd, uctxt->ctxt, fd->subctxt);
218
219 spin_lock(&fd->pq_rcu_lock);
220 pq = srcu_dereference_check(fd->pq, &fd->pq_srcu,
221 lockdep_is_held(&fd->pq_rcu_lock));
222 if (pq) {
223 rcu_assign_pointer(fd->pq, NULL);
224 spin_unlock(&fd->pq_rcu_lock);
225 synchronize_srcu(&fd->pq_srcu);
226 /* at this point there can be no more new requests */
227 iowait_sdma_drain(&pq->busy);
228 /* Wait until all requests have been freed. */
229 wait_event_interruptible(
230 pq->wait,
231 !atomic_read(&pq->n_reqs));
232 kfree(pq->reqs);
233 hfi1_free_system_pinning(pq);
234 bitmap_free(pq->req_in_use);
235 kmem_cache_destroy(pq->txreq_cache);
236 flush_pq_iowait(pq);
237 kfree(pq);
238 } else {
239 spin_unlock(&fd->pq_rcu_lock);
240 }
241 if (fd->cq) {
242 vfree(fd->cq->comps);
243 kfree(fd->cq);
244 fd->cq = NULL;
245 }
246 return 0;
247}
248
249static u8 dlid_to_selector(u16 dlid)
250{
251 static u8 mapping[256];
252 static int initialized;
253 static u8 next;
254 int hash;
255
256 if (!initialized) {
257 memset(mapping, 0xFF, 256);
258 initialized = 1;
259 }
260
261 hash = ((dlid >> 8) ^ dlid) & 0xFF;
262 if (mapping[hash] == 0xFF) {
263 mapping[hash] = next;
264 next = (next + 1) & 0x7F;
265 }
266
267 return mapping[hash];
268}
269
270/**
271 * hfi1_user_sdma_process_request() - Process and start a user sdma request
272 * @fd: valid file descriptor
273 * @iovec: array of io vectors to process
274 * @dim: overall iovec array size
275 * @count: number of io vector array entries processed
276 */
277int hfi1_user_sdma_process_request(struct hfi1_filedata *fd,
278 struct iovec *iovec, unsigned long dim,
279 unsigned long *count)
280{
281 int ret = 0, i;
282 struct hfi1_ctxtdata *uctxt = fd->uctxt;
283 struct hfi1_user_sdma_pkt_q *pq =
284 srcu_dereference(fd->pq, &fd->pq_srcu);
285 struct hfi1_user_sdma_comp_q *cq = fd->cq;
286 struct hfi1_devdata *dd = pq->dd;
287 unsigned long idx = 0;
288 u8 pcount = initial_pkt_count;
289 struct sdma_req_info info;
290 struct user_sdma_request *req;
291 u8 opcode, sc, vl;
292 u16 pkey;
293 u32 slid;
294 u16 dlid;
295 u32 selector;
296
297 if (iovec[idx].iov_len < sizeof(info) + sizeof(req->hdr)) {
298 hfi1_cdbg(
299 SDMA,
300 "[%u:%u:%u] First vector not big enough for header %lu/%lu",
301 dd->unit, uctxt->ctxt, fd->subctxt,
302 iovec[idx].iov_len, sizeof(info) + sizeof(req->hdr));
303 return -EINVAL;
304 }
305 ret = copy_from_user(&info, iovec[idx].iov_base, sizeof(info));
306 if (ret) {
307 hfi1_cdbg(SDMA, "[%u:%u:%u] Failed to copy info QW (%d)",
308 dd->unit, uctxt->ctxt, fd->subctxt, ret);
309 return -EFAULT;
310 }
311
312 trace_hfi1_sdma_user_reqinfo(dd, uctxt->ctxt, fd->subctxt,
313 (u16 *)&info);
314 if (info.comp_idx >= hfi1_sdma_comp_ring_size) {
315 hfi1_cdbg(SDMA,
316 "[%u:%u:%u:%u] Invalid comp index",
317 dd->unit, uctxt->ctxt, fd->subctxt, info.comp_idx);
318 return -EINVAL;
319 }
320
321 /*
322 * Sanity check the header io vector count. Need at least 1 vector
323 * (header) and cannot be larger than the actual io vector count.
324 */
325 if (req_iovcnt(info.ctrl) < 1 || req_iovcnt(info.ctrl) > dim) {
326 hfi1_cdbg(SDMA,
327 "[%u:%u:%u:%u] Invalid iov count %d, dim %ld",
328 dd->unit, uctxt->ctxt, fd->subctxt, info.comp_idx,
329 req_iovcnt(info.ctrl), dim);
330 return -EINVAL;
331 }
332
333 if (!info.fragsize) {
334 hfi1_cdbg(SDMA,
335 "[%u:%u:%u:%u] Request does not specify fragsize",
336 dd->unit, uctxt->ctxt, fd->subctxt, info.comp_idx);
337 return -EINVAL;
338 }
339
340 /* Try to claim the request. */
341 if (test_and_set_bit(info.comp_idx, pq->req_in_use)) {
342 hfi1_cdbg(SDMA, "[%u:%u:%u] Entry %u is in use",
343 dd->unit, uctxt->ctxt, fd->subctxt,
344 info.comp_idx);
345 return -EBADSLT;
346 }
347 /*
348 * All safety checks have been done and this request has been claimed.
349 */
350 trace_hfi1_sdma_user_process_request(dd, uctxt->ctxt, fd->subctxt,
351 info.comp_idx);
352 req = pq->reqs + info.comp_idx;
353 req->data_iovs = req_iovcnt(info.ctrl) - 1; /* subtract header vector */
354 req->data_len = 0;
355 req->pq = pq;
356 req->cq = cq;
357 req->ahg_idx = -1;
358 req->iov_idx = 0;
359 req->sent = 0;
360 req->seqnum = 0;
361 req->seqcomp = 0;
362 req->seqsubmitted = 0;
363 req->tids = NULL;
364 req->has_error = 0;
365 INIT_LIST_HEAD(&req->txps);
366
367 memcpy(&req->info, &info, sizeof(info));
368
369 /* The request is initialized, count it */
370 atomic_inc(&pq->n_reqs);
371
372 if (req_opcode(info.ctrl) == EXPECTED) {
373 /* expected must have a TID info and at least one data vector */
374 if (req->data_iovs < 2) {
375 SDMA_DBG(req,
376 "Not enough vectors for expected request");
377 ret = -EINVAL;
378 goto free_req;
379 }
380 req->data_iovs--;
381 }
382
383 if (!info.npkts || req->data_iovs > MAX_VECTORS_PER_REQ) {
384 SDMA_DBG(req, "Too many vectors (%u/%u)", req->data_iovs,
385 MAX_VECTORS_PER_REQ);
386 ret = -EINVAL;
387 goto free_req;
388 }
389
390 /* Copy the header from the user buffer */
391 ret = copy_from_user(&req->hdr, iovec[idx].iov_base + sizeof(info),
392 sizeof(req->hdr));
393 if (ret) {
394 SDMA_DBG(req, "Failed to copy header template (%d)", ret);
395 ret = -EFAULT;
396 goto free_req;
397 }
398
399 /* If Static rate control is not enabled, sanitize the header. */
400 if (!HFI1_CAP_IS_USET(STATIC_RATE_CTRL))
401 req->hdr.pbc[2] = 0;
402
403 /* Validate the opcode. Do not trust packets from user space blindly. */
404 opcode = (be32_to_cpu(req->hdr.bth[0]) >> 24) & 0xff;
405 if ((opcode & USER_OPCODE_CHECK_MASK) !=
406 USER_OPCODE_CHECK_VAL) {
407 SDMA_DBG(req, "Invalid opcode (%d)", opcode);
408 ret = -EINVAL;
409 goto free_req;
410 }
411 /*
412 * Validate the vl. Do not trust packets from user space blindly.
413 * VL comes from PBC, SC comes from LRH, and the VL needs to
414 * match the SC look up.
415 */
416 vl = (le16_to_cpu(req->hdr.pbc[0]) >> 12) & 0xF;
417 sc = (((be16_to_cpu(req->hdr.lrh[0]) >> 12) & 0xF) |
418 (((le16_to_cpu(req->hdr.pbc[1]) >> 14) & 0x1) << 4));
419 if (vl >= dd->pport->vls_operational ||
420 vl != sc_to_vlt(dd, sc)) {
421 SDMA_DBG(req, "Invalid SC(%u)/VL(%u)", sc, vl);
422 ret = -EINVAL;
423 goto free_req;
424 }
425
426 /* Checking P_KEY for requests from user-space */
427 pkey = (u16)be32_to_cpu(req->hdr.bth[0]);
428 slid = be16_to_cpu(req->hdr.lrh[3]);
429 if (egress_pkey_check(dd->pport, slid, pkey, sc, PKEY_CHECK_INVALID)) {
430 ret = -EINVAL;
431 goto free_req;
432 }
433
434 /*
435 * Also should check the BTH.lnh. If it says the next header is GRH then
436 * the RXE parsing will be off and will land in the middle of the KDETH
437 * or miss it entirely.
438 */
439 if ((be16_to_cpu(req->hdr.lrh[0]) & 0x3) == HFI1_LRH_GRH) {
440 SDMA_DBG(req, "User tried to pass in a GRH");
441 ret = -EINVAL;
442 goto free_req;
443 }
444
445 req->koffset = le32_to_cpu(req->hdr.kdeth.swdata[6]);
446 /*
447 * Calculate the initial TID offset based on the values of
448 * KDETH.OFFSET and KDETH.OM that are passed in.
449 */
450 req->tidoffset = KDETH_GET(req->hdr.kdeth.ver_tid_offset, OFFSET) *
451 (KDETH_GET(req->hdr.kdeth.ver_tid_offset, OM) ?
452 KDETH_OM_LARGE : KDETH_OM_SMALL);
453 trace_hfi1_sdma_user_initial_tidoffset(dd, uctxt->ctxt, fd->subctxt,
454 info.comp_idx, req->tidoffset);
455 idx++;
456
457 /* Save all the IO vector structures */
458 for (i = 0; i < req->data_iovs; i++) {
459 req->iovs[i].offset = 0;
460 INIT_LIST_HEAD(&req->iovs[i].list);
461 memcpy(&req->iovs[i].iov,
462 iovec + idx++,
463 sizeof(req->iovs[i].iov));
464 if (req->iovs[i].iov.iov_len == 0) {
465 ret = -EINVAL;
466 goto free_req;
467 }
468 req->data_len += req->iovs[i].iov.iov_len;
469 }
470 trace_hfi1_sdma_user_data_length(dd, uctxt->ctxt, fd->subctxt,
471 info.comp_idx, req->data_len);
472 if (pcount > req->info.npkts)
473 pcount = req->info.npkts;
474 /*
475 * Copy any TID info
476 * User space will provide the TID info only when the
477 * request type is EXPECTED. This is true even if there is
478 * only one packet in the request and the header is already
479 * setup. The reason for the singular TID case is that the
480 * driver needs to perform safety checks.
481 */
482 if (req_opcode(req->info.ctrl) == EXPECTED) {
483 u16 ntids = iovec[idx].iov_len / sizeof(*req->tids);
484 u32 *tmp;
485
486 if (!ntids || ntids > MAX_TID_PAIR_ENTRIES) {
487 ret = -EINVAL;
488 goto free_req;
489 }
490
491 /*
492 * We have to copy all of the tids because they may vary
493 * in size and, therefore, the TID count might not be
494 * equal to the pkt count. However, there is no way to
495 * tell at this point.
496 */
497 tmp = memdup_array_user(iovec[idx].iov_base,
498 ntids, sizeof(*req->tids));
499 if (IS_ERR(tmp)) {
500 ret = PTR_ERR(tmp);
501 SDMA_DBG(req, "Failed to copy %d TIDs (%d)",
502 ntids, ret);
503 goto free_req;
504 }
505 req->tids = tmp;
506 req->n_tids = ntids;
507 req->tididx = 0;
508 idx++;
509 }
510
511 dlid = be16_to_cpu(req->hdr.lrh[1]);
512 selector = dlid_to_selector(dlid);
513 selector += uctxt->ctxt + fd->subctxt;
514 req->sde = sdma_select_user_engine(dd, selector, vl);
515
516 if (!req->sde || !sdma_running(req->sde)) {
517 ret = -ECOMM;
518 goto free_req;
519 }
520
521 /* We don't need an AHG entry if the request contains only one packet */
522 if (req->info.npkts > 1 && HFI1_CAP_IS_USET(SDMA_AHG))
523 req->ahg_idx = sdma_ahg_alloc(req->sde);
524
525 set_comp_state(pq, cq, info.comp_idx, QUEUED, 0);
526 pq->state = SDMA_PKT_Q_ACTIVE;
527
528 /*
529 * This is a somewhat blocking send implementation.
530 * The driver will block the caller until all packets of the
531 * request have been submitted to the SDMA engine. However, it
532 * will not wait for send completions.
533 */
534 while (req->seqsubmitted != req->info.npkts) {
535 ret = user_sdma_send_pkts(req, pcount);
536 if (ret < 0) {
537 int we_ret;
538
539 if (ret != -EBUSY)
540 goto free_req;
541 we_ret = wait_event_interruptible_timeout(
542 pq->busy.wait_dma,
543 pq->state == SDMA_PKT_Q_ACTIVE,
544 msecs_to_jiffies(
545 SDMA_IOWAIT_TIMEOUT));
546 trace_hfi1_usdma_we(pq, we_ret);
547 if (we_ret <= 0)
548 flush_pq_iowait(pq);
549 }
550 }
551 *count += idx;
552 return 0;
553free_req:
554 /*
555 * If the submitted seqsubmitted == npkts, the completion routine
556 * controls the final state. If sequbmitted < npkts, wait for any
557 * outstanding packets to finish before cleaning up.
558 */
559 if (req->seqsubmitted < req->info.npkts) {
560 if (req->seqsubmitted)
561 wait_event(pq->busy.wait_dma,
562 (req->seqcomp == req->seqsubmitted - 1));
563 user_sdma_free_request(req);
564 pq_update(pq);
565 set_comp_state(pq, cq, info.comp_idx, ERROR, ret);
566 }
567 return ret;
568}
569
570static inline u32 compute_data_length(struct user_sdma_request *req,
571 struct user_sdma_txreq *tx)
572{
573 /*
574 * Determine the proper size of the packet data.
575 * The size of the data of the first packet is in the header
576 * template. However, it includes the header and ICRC, which need
577 * to be subtracted.
578 * The minimum representable packet data length in a header is 4 bytes,
579 * therefore, when the data length request is less than 4 bytes, there's
580 * only one packet, and the packet data length is equal to that of the
581 * request data length.
582 * The size of the remaining packets is the minimum of the frag
583 * size (MTU) or remaining data in the request.
584 */
585 u32 len;
586
587 if (!req->seqnum) {
588 if (req->data_len < sizeof(u32))
589 len = req->data_len;
590 else
591 len = ((be16_to_cpu(req->hdr.lrh[2]) << 2) -
592 (sizeof(tx->hdr) - 4));
593 } else if (req_opcode(req->info.ctrl) == EXPECTED) {
594 u32 tidlen = EXP_TID_GET(req->tids[req->tididx], LEN) *
595 PAGE_SIZE;
596 /*
597 * Get the data length based on the remaining space in the
598 * TID pair.
599 */
600 len = min(tidlen - req->tidoffset, (u32)req->info.fragsize);
601 /* If we've filled up the TID pair, move to the next one. */
602 if (unlikely(!len) && ++req->tididx < req->n_tids &&
603 req->tids[req->tididx]) {
604 tidlen = EXP_TID_GET(req->tids[req->tididx],
605 LEN) * PAGE_SIZE;
606 req->tidoffset = 0;
607 len = min_t(u32, tidlen, req->info.fragsize);
608 }
609 /*
610 * Since the TID pairs map entire pages, make sure that we
611 * are not going to try to send more data that we have
612 * remaining.
613 */
614 len = min(len, req->data_len - req->sent);
615 } else {
616 len = min(req->data_len - req->sent, (u32)req->info.fragsize);
617 }
618 trace_hfi1_sdma_user_compute_length(req->pq->dd,
619 req->pq->ctxt,
620 req->pq->subctxt,
621 req->info.comp_idx,
622 len);
623 return len;
624}
625
626static inline u32 pad_len(u32 len)
627{
628 if (len & (sizeof(u32) - 1))
629 len += sizeof(u32) - (len & (sizeof(u32) - 1));
630 return len;
631}
632
633static inline u32 get_lrh_len(struct hfi1_pkt_header hdr, u32 len)
634{
635 /* (Size of complete header - size of PBC) + 4B ICRC + data length */
636 return ((sizeof(hdr) - sizeof(hdr.pbc)) + 4 + len);
637}
638
639static int user_sdma_txadd_ahg(struct user_sdma_request *req,
640 struct user_sdma_txreq *tx,
641 u32 datalen)
642{
643 int ret;
644 u16 pbclen = le16_to_cpu(req->hdr.pbc[0]);
645 u32 lrhlen = get_lrh_len(req->hdr, pad_len(datalen));
646 struct hfi1_user_sdma_pkt_q *pq = req->pq;
647
648 /*
649 * Copy the request header into the tx header
650 * because the HW needs a cacheline-aligned
651 * address.
652 * This copy can be optimized out if the hdr
653 * member of user_sdma_request were also
654 * cacheline aligned.
655 */
656 memcpy(&tx->hdr, &req->hdr, sizeof(tx->hdr));
657 if (PBC2LRH(pbclen) != lrhlen) {
658 pbclen = (pbclen & 0xf000) | LRH2PBC(lrhlen);
659 tx->hdr.pbc[0] = cpu_to_le16(pbclen);
660 }
661 ret = check_header_template(req, &tx->hdr, lrhlen, datalen);
662 if (ret)
663 return ret;
664 ret = sdma_txinit_ahg(&tx->txreq, SDMA_TXREQ_F_AHG_COPY,
665 sizeof(tx->hdr) + datalen, req->ahg_idx,
666 0, NULL, 0, user_sdma_txreq_cb);
667 if (ret)
668 return ret;
669 ret = sdma_txadd_kvaddr(pq->dd, &tx->txreq, &tx->hdr, sizeof(tx->hdr));
670 if (ret)
671 sdma_txclean(pq->dd, &tx->txreq);
672 return ret;
673}
674
675static int user_sdma_send_pkts(struct user_sdma_request *req, u16 maxpkts)
676{
677 int ret = 0;
678 u16 count;
679 unsigned npkts = 0;
680 struct user_sdma_txreq *tx = NULL;
681 struct hfi1_user_sdma_pkt_q *pq = NULL;
682 struct user_sdma_iovec *iovec = NULL;
683
684 if (!req->pq)
685 return -EINVAL;
686
687 pq = req->pq;
688
689 /* If tx completion has reported an error, we are done. */
690 if (READ_ONCE(req->has_error))
691 return -EFAULT;
692
693 /*
694 * Check if we might have sent the entire request already
695 */
696 if (unlikely(req->seqnum == req->info.npkts)) {
697 if (!list_empty(&req->txps))
698 goto dosend;
699 return ret;
700 }
701
702 if (!maxpkts || maxpkts > req->info.npkts - req->seqnum)
703 maxpkts = req->info.npkts - req->seqnum;
704
705 while (npkts < maxpkts) {
706 u32 datalen = 0;
707
708 /*
709 * Check whether any of the completions have come back
710 * with errors. If so, we are not going to process any
711 * more packets from this request.
712 */
713 if (READ_ONCE(req->has_error))
714 return -EFAULT;
715
716 tx = kmem_cache_alloc(pq->txreq_cache, GFP_KERNEL);
717 if (!tx)
718 return -ENOMEM;
719
720 tx->flags = 0;
721 tx->req = req;
722 INIT_LIST_HEAD(&tx->list);
723
724 /*
725 * For the last packet set the ACK request
726 * and disable header suppression.
727 */
728 if (req->seqnum == req->info.npkts - 1)
729 tx->flags |= (TXREQ_FLAGS_REQ_ACK |
730 TXREQ_FLAGS_REQ_DISABLE_SH);
731
732 /*
733 * Calculate the payload size - this is min of the fragment
734 * (MTU) size or the remaining bytes in the request but only
735 * if we have payload data.
736 */
737 if (req->data_len) {
738 iovec = &req->iovs[req->iov_idx];
739 if (READ_ONCE(iovec->offset) == iovec->iov.iov_len) {
740 if (++req->iov_idx == req->data_iovs) {
741 ret = -EFAULT;
742 goto free_tx;
743 }
744 iovec = &req->iovs[req->iov_idx];
745 WARN_ON(iovec->offset);
746 }
747
748 datalen = compute_data_length(req, tx);
749
750 /*
751 * Disable header suppression for the payload <= 8DWS.
752 * If there is an uncorrectable error in the receive
753 * data FIFO when the received payload size is less than
754 * or equal to 8DWS then the RxDmaDataFifoRdUncErr is
755 * not reported.There is set RHF.EccErr if the header
756 * is not suppressed.
757 */
758 if (!datalen) {
759 SDMA_DBG(req,
760 "Request has data but pkt len is 0");
761 ret = -EFAULT;
762 goto free_tx;
763 } else if (datalen <= 32) {
764 tx->flags |= TXREQ_FLAGS_REQ_DISABLE_SH;
765 }
766 }
767
768 if (req->ahg_idx >= 0) {
769 if (!req->seqnum) {
770 ret = user_sdma_txadd_ahg(req, tx, datalen);
771 if (ret)
772 goto free_tx;
773 } else {
774 int changes;
775
776 changes = set_txreq_header_ahg(req, tx,
777 datalen);
778 if (changes < 0) {
779 ret = changes;
780 goto free_tx;
781 }
782 }
783 } else {
784 ret = sdma_txinit(&tx->txreq, 0, sizeof(req->hdr) +
785 datalen, user_sdma_txreq_cb);
786 if (ret)
787 goto free_tx;
788 /*
789 * Modify the header for this packet. This only needs
790 * to be done if we are not going to use AHG. Otherwise,
791 * the HW will do it based on the changes we gave it
792 * during sdma_txinit_ahg().
793 */
794 ret = set_txreq_header(req, tx, datalen);
795 if (ret)
796 goto free_txreq;
797 }
798
799 req->koffset += datalen;
800 if (req_opcode(req->info.ctrl) == EXPECTED)
801 req->tidoffset += datalen;
802 req->sent += datalen;
803 while (datalen) {
804 ret = hfi1_add_pages_to_sdma_packet(req, tx, iovec,
805 &datalen);
806 if (ret)
807 goto free_txreq;
808 iovec = &req->iovs[req->iov_idx];
809 }
810 list_add_tail(&tx->txreq.list, &req->txps);
811 /*
812 * It is important to increment this here as it is used to
813 * generate the BTH.PSN and, therefore, can't be bulk-updated
814 * outside of the loop.
815 */
816 tx->seqnum = req->seqnum++;
817 npkts++;
818 }
819dosend:
820 ret = sdma_send_txlist(req->sde,
821 iowait_get_ib_work(&pq->busy),
822 &req->txps, &count);
823 req->seqsubmitted += count;
824 if (req->seqsubmitted == req->info.npkts) {
825 /*
826 * The txreq has already been submitted to the HW queue
827 * so we can free the AHG entry now. Corruption will not
828 * happen due to the sequential manner in which
829 * descriptors are processed.
830 */
831 if (req->ahg_idx >= 0)
832 sdma_ahg_free(req->sde, req->ahg_idx);
833 }
834 return ret;
835
836free_txreq:
837 sdma_txclean(pq->dd, &tx->txreq);
838free_tx:
839 kmem_cache_free(pq->txreq_cache, tx);
840 return ret;
841}
842
843static int check_header_template(struct user_sdma_request *req,
844 struct hfi1_pkt_header *hdr, u32 lrhlen,
845 u32 datalen)
846{
847 /*
848 * Perform safety checks for any type of packet:
849 * - transfer size is multiple of 64bytes
850 * - packet length is multiple of 4 bytes
851 * - packet length is not larger than MTU size
852 *
853 * These checks are only done for the first packet of the
854 * transfer since the header is "given" to us by user space.
855 * For the remainder of the packets we compute the values.
856 */
857 if (req->info.fragsize % PIO_BLOCK_SIZE || lrhlen & 0x3 ||
858 lrhlen > get_lrh_len(*hdr, req->info.fragsize))
859 return -EINVAL;
860
861 if (req_opcode(req->info.ctrl) == EXPECTED) {
862 /*
863 * The header is checked only on the first packet. Furthermore,
864 * we ensure that at least one TID entry is copied when the
865 * request is submitted. Therefore, we don't have to verify that
866 * tididx points to something sane.
867 */
868 u32 tidval = req->tids[req->tididx],
869 tidlen = EXP_TID_GET(tidval, LEN) * PAGE_SIZE,
870 tididx = EXP_TID_GET(tidval, IDX),
871 tidctrl = EXP_TID_GET(tidval, CTRL),
872 tidoff;
873 __le32 kval = hdr->kdeth.ver_tid_offset;
874
875 tidoff = KDETH_GET(kval, OFFSET) *
876 (KDETH_GET(req->hdr.kdeth.ver_tid_offset, OM) ?
877 KDETH_OM_LARGE : KDETH_OM_SMALL);
878 /*
879 * Expected receive packets have the following
880 * additional checks:
881 * - offset is not larger than the TID size
882 * - TIDCtrl values match between header and TID array
883 * - TID indexes match between header and TID array
884 */
885 if ((tidoff + datalen > tidlen) ||
886 KDETH_GET(kval, TIDCTRL) != tidctrl ||
887 KDETH_GET(kval, TID) != tididx)
888 return -EINVAL;
889 }
890 return 0;
891}
892
893/*
894 * Correctly set the BTH.PSN field based on type of
895 * transfer - eager packets can just increment the PSN but
896 * expected packets encode generation and sequence in the
897 * BTH.PSN field so just incrementing will result in errors.
898 */
899static inline u32 set_pkt_bth_psn(__be32 bthpsn, u8 expct, u32 frags)
900{
901 u32 val = be32_to_cpu(bthpsn),
902 mask = (HFI1_CAP_IS_KSET(EXTENDED_PSN) ? 0x7fffffffull :
903 0xffffffull),
904 psn = val & mask;
905 if (expct)
906 psn = (psn & ~HFI1_KDETH_BTH_SEQ_MASK) |
907 ((psn + frags) & HFI1_KDETH_BTH_SEQ_MASK);
908 else
909 psn = psn + frags;
910 return psn & mask;
911}
912
913static int set_txreq_header(struct user_sdma_request *req,
914 struct user_sdma_txreq *tx, u32 datalen)
915{
916 struct hfi1_user_sdma_pkt_q *pq = req->pq;
917 struct hfi1_pkt_header *hdr = &tx->hdr;
918 u8 omfactor; /* KDETH.OM */
919 u16 pbclen;
920 int ret;
921 u32 tidval = 0, lrhlen = get_lrh_len(*hdr, pad_len(datalen));
922
923 /* Copy the header template to the request before modification */
924 memcpy(hdr, &req->hdr, sizeof(*hdr));
925
926 /*
927 * Check if the PBC and LRH length are mismatched. If so
928 * adjust both in the header.
929 */
930 pbclen = le16_to_cpu(hdr->pbc[0]);
931 if (PBC2LRH(pbclen) != lrhlen) {
932 pbclen = (pbclen & 0xf000) | LRH2PBC(lrhlen);
933 hdr->pbc[0] = cpu_to_le16(pbclen);
934 hdr->lrh[2] = cpu_to_be16(lrhlen >> 2);
935 /*
936 * Third packet
937 * This is the first packet in the sequence that has
938 * a "static" size that can be used for the rest of
939 * the packets (besides the last one).
940 */
941 if (unlikely(req->seqnum == 2)) {
942 /*
943 * From this point on the lengths in both the
944 * PBC and LRH are the same until the last
945 * packet.
946 * Adjust the template so we don't have to update
947 * every packet
948 */
949 req->hdr.pbc[0] = hdr->pbc[0];
950 req->hdr.lrh[2] = hdr->lrh[2];
951 }
952 }
953 /*
954 * We only have to modify the header if this is not the
955 * first packet in the request. Otherwise, we use the
956 * header given to us.
957 */
958 if (unlikely(!req->seqnum)) {
959 ret = check_header_template(req, hdr, lrhlen, datalen);
960 if (ret)
961 return ret;
962 goto done;
963 }
964
965 hdr->bth[2] = cpu_to_be32(
966 set_pkt_bth_psn(hdr->bth[2],
967 (req_opcode(req->info.ctrl) == EXPECTED),
968 req->seqnum));
969
970 /* Set ACK request on last packet */
971 if (unlikely(tx->flags & TXREQ_FLAGS_REQ_ACK))
972 hdr->bth[2] |= cpu_to_be32(1UL << 31);
973
974 /* Set the new offset */
975 hdr->kdeth.swdata[6] = cpu_to_le32(req->koffset);
976 /* Expected packets have to fill in the new TID information */
977 if (req_opcode(req->info.ctrl) == EXPECTED) {
978 tidval = req->tids[req->tididx];
979 /*
980 * If the offset puts us at the end of the current TID,
981 * advance everything.
982 */
983 if ((req->tidoffset) == (EXP_TID_GET(tidval, LEN) *
984 PAGE_SIZE)) {
985 req->tidoffset = 0;
986 /*
987 * Since we don't copy all the TIDs, all at once,
988 * we have to check again.
989 */
990 if (++req->tididx > req->n_tids - 1 ||
991 !req->tids[req->tididx]) {
992 return -EINVAL;
993 }
994 tidval = req->tids[req->tididx];
995 }
996 omfactor = EXP_TID_GET(tidval, LEN) * PAGE_SIZE >=
997 KDETH_OM_MAX_SIZE ? KDETH_OM_LARGE_SHIFT :
998 KDETH_OM_SMALL_SHIFT;
999 /* Set KDETH.TIDCtrl based on value for this TID. */
1000 KDETH_SET(hdr->kdeth.ver_tid_offset, TIDCTRL,
1001 EXP_TID_GET(tidval, CTRL));
1002 /* Set KDETH.TID based on value for this TID */
1003 KDETH_SET(hdr->kdeth.ver_tid_offset, TID,
1004 EXP_TID_GET(tidval, IDX));
1005 /* Clear KDETH.SH when DISABLE_SH flag is set */
1006 if (unlikely(tx->flags & TXREQ_FLAGS_REQ_DISABLE_SH))
1007 KDETH_SET(hdr->kdeth.ver_tid_offset, SH, 0);
1008 /*
1009 * Set the KDETH.OFFSET and KDETH.OM based on size of
1010 * transfer.
1011 */
1012 trace_hfi1_sdma_user_tid_info(
1013 pq->dd, pq->ctxt, pq->subctxt, req->info.comp_idx,
1014 req->tidoffset, req->tidoffset >> omfactor,
1015 omfactor != KDETH_OM_SMALL_SHIFT);
1016 KDETH_SET(hdr->kdeth.ver_tid_offset, OFFSET,
1017 req->tidoffset >> omfactor);
1018 KDETH_SET(hdr->kdeth.ver_tid_offset, OM,
1019 omfactor != KDETH_OM_SMALL_SHIFT);
1020 }
1021done:
1022 trace_hfi1_sdma_user_header(pq->dd, pq->ctxt, pq->subctxt,
1023 req->info.comp_idx, hdr, tidval);
1024 return sdma_txadd_kvaddr(pq->dd, &tx->txreq, hdr, sizeof(*hdr));
1025}
1026
1027static int set_txreq_header_ahg(struct user_sdma_request *req,
1028 struct user_sdma_txreq *tx, u32 datalen)
1029{
1030 u32 ahg[AHG_KDETH_ARRAY_SIZE];
1031 int idx = 0;
1032 u8 omfactor; /* KDETH.OM */
1033 struct hfi1_user_sdma_pkt_q *pq = req->pq;
1034 struct hfi1_pkt_header *hdr = &req->hdr;
1035 u16 pbclen = le16_to_cpu(hdr->pbc[0]);
1036 u32 val32, tidval = 0, lrhlen = get_lrh_len(*hdr, pad_len(datalen));
1037 size_t array_size = ARRAY_SIZE(ahg);
1038
1039 if (PBC2LRH(pbclen) != lrhlen) {
1040 /* PBC.PbcLengthDWs */
1041 idx = ahg_header_set(ahg, idx, array_size, 0, 0, 12,
1042 (__force u16)cpu_to_le16(LRH2PBC(lrhlen)));
1043 if (idx < 0)
1044 return idx;
1045 /* LRH.PktLen (we need the full 16 bits due to byte swap) */
1046 idx = ahg_header_set(ahg, idx, array_size, 3, 0, 16,
1047 (__force u16)cpu_to_be16(lrhlen >> 2));
1048 if (idx < 0)
1049 return idx;
1050 }
1051
1052 /*
1053 * Do the common updates
1054 */
1055 /* BTH.PSN and BTH.A */
1056 val32 = (be32_to_cpu(hdr->bth[2]) + req->seqnum) &
1057 (HFI1_CAP_IS_KSET(EXTENDED_PSN) ? 0x7fffffff : 0xffffff);
1058 if (unlikely(tx->flags & TXREQ_FLAGS_REQ_ACK))
1059 val32 |= 1UL << 31;
1060 idx = ahg_header_set(ahg, idx, array_size, 6, 0, 16,
1061 (__force u16)cpu_to_be16(val32 >> 16));
1062 if (idx < 0)
1063 return idx;
1064 idx = ahg_header_set(ahg, idx, array_size, 6, 16, 16,
1065 (__force u16)cpu_to_be16(val32 & 0xffff));
1066 if (idx < 0)
1067 return idx;
1068 /* KDETH.Offset */
1069 idx = ahg_header_set(ahg, idx, array_size, 15, 0, 16,
1070 (__force u16)cpu_to_le16(req->koffset & 0xffff));
1071 if (idx < 0)
1072 return idx;
1073 idx = ahg_header_set(ahg, idx, array_size, 15, 16, 16,
1074 (__force u16)cpu_to_le16(req->koffset >> 16));
1075 if (idx < 0)
1076 return idx;
1077 if (req_opcode(req->info.ctrl) == EXPECTED) {
1078 __le16 val;
1079
1080 tidval = req->tids[req->tididx];
1081
1082 /*
1083 * If the offset puts us at the end of the current TID,
1084 * advance everything.
1085 */
1086 if ((req->tidoffset) == (EXP_TID_GET(tidval, LEN) *
1087 PAGE_SIZE)) {
1088 req->tidoffset = 0;
1089 /*
1090 * Since we don't copy all the TIDs, all at once,
1091 * we have to check again.
1092 */
1093 if (++req->tididx > req->n_tids - 1 ||
1094 !req->tids[req->tididx])
1095 return -EINVAL;
1096 tidval = req->tids[req->tididx];
1097 }
1098 omfactor = ((EXP_TID_GET(tidval, LEN) *
1099 PAGE_SIZE) >=
1100 KDETH_OM_MAX_SIZE) ? KDETH_OM_LARGE_SHIFT :
1101 KDETH_OM_SMALL_SHIFT;
1102 /* KDETH.OM and KDETH.OFFSET (TID) */
1103 idx = ahg_header_set(
1104 ahg, idx, array_size, 7, 0, 16,
1105 ((!!(omfactor - KDETH_OM_SMALL_SHIFT)) << 15 |
1106 ((req->tidoffset >> omfactor)
1107 & 0x7fff)));
1108 if (idx < 0)
1109 return idx;
1110 /* KDETH.TIDCtrl, KDETH.TID, KDETH.Intr, KDETH.SH */
1111 val = cpu_to_le16(((EXP_TID_GET(tidval, CTRL) & 0x3) << 10) |
1112 (EXP_TID_GET(tidval, IDX) & 0x3ff));
1113
1114 if (unlikely(tx->flags & TXREQ_FLAGS_REQ_DISABLE_SH)) {
1115 val |= cpu_to_le16((KDETH_GET(hdr->kdeth.ver_tid_offset,
1116 INTR) <<
1117 AHG_KDETH_INTR_SHIFT));
1118 } else {
1119 val |= KDETH_GET(hdr->kdeth.ver_tid_offset, SH) ?
1120 cpu_to_le16(0x1 << AHG_KDETH_SH_SHIFT) :
1121 cpu_to_le16((KDETH_GET(hdr->kdeth.ver_tid_offset,
1122 INTR) <<
1123 AHG_KDETH_INTR_SHIFT));
1124 }
1125
1126 idx = ahg_header_set(ahg, idx, array_size,
1127 7, 16, 14, (__force u16)val);
1128 if (idx < 0)
1129 return idx;
1130 }
1131
1132 trace_hfi1_sdma_user_header_ahg(pq->dd, pq->ctxt, pq->subctxt,
1133 req->info.comp_idx, req->sde->this_idx,
1134 req->ahg_idx, ahg, idx, tidval);
1135 sdma_txinit_ahg(&tx->txreq,
1136 SDMA_TXREQ_F_USE_AHG,
1137 datalen, req->ahg_idx, idx,
1138 ahg, sizeof(req->hdr),
1139 user_sdma_txreq_cb);
1140
1141 return idx;
1142}
1143
1144/**
1145 * user_sdma_txreq_cb() - SDMA tx request completion callback.
1146 * @txreq: valid sdma tx request
1147 * @status: success/failure of request
1148 *
1149 * Called when the SDMA progress state machine gets notification that
1150 * the SDMA descriptors for this tx request have been processed by the
1151 * DMA engine. Called in interrupt context.
1152 * Only do work on completed sequences.
1153 */
1154static void user_sdma_txreq_cb(struct sdma_txreq *txreq, int status)
1155{
1156 struct user_sdma_txreq *tx =
1157 container_of(txreq, struct user_sdma_txreq, txreq);
1158 struct user_sdma_request *req;
1159 struct hfi1_user_sdma_pkt_q *pq;
1160 struct hfi1_user_sdma_comp_q *cq;
1161 enum hfi1_sdma_comp_state state = COMPLETE;
1162
1163 if (!tx->req)
1164 return;
1165
1166 req = tx->req;
1167 pq = req->pq;
1168 cq = req->cq;
1169
1170 if (status != SDMA_TXREQ_S_OK) {
1171 SDMA_DBG(req, "SDMA completion with error %d",
1172 status);
1173 WRITE_ONCE(req->has_error, 1);
1174 state = ERROR;
1175 }
1176
1177 req->seqcomp = tx->seqnum;
1178 kmem_cache_free(pq->txreq_cache, tx);
1179
1180 /* sequence isn't complete? We are done */
1181 if (req->seqcomp != req->info.npkts - 1)
1182 return;
1183
1184 user_sdma_free_request(req);
1185 set_comp_state(pq, cq, req->info.comp_idx, state, status);
1186 pq_update(pq);
1187}
1188
1189static inline void pq_update(struct hfi1_user_sdma_pkt_q *pq)
1190{
1191 if (atomic_dec_and_test(&pq->n_reqs))
1192 wake_up(&pq->wait);
1193}
1194
1195static void user_sdma_free_request(struct user_sdma_request *req)
1196{
1197 if (!list_empty(&req->txps)) {
1198 struct sdma_txreq *t, *p;
1199
1200 list_for_each_entry_safe(t, p, &req->txps, list) {
1201 struct user_sdma_txreq *tx =
1202 container_of(t, struct user_sdma_txreq, txreq);
1203 list_del_init(&t->list);
1204 sdma_txclean(req->pq->dd, t);
1205 kmem_cache_free(req->pq->txreq_cache, tx);
1206 }
1207 }
1208
1209 kfree(req->tids);
1210 clear_bit(req->info.comp_idx, req->pq->req_in_use);
1211}
1212
1213static inline void set_comp_state(struct hfi1_user_sdma_pkt_q *pq,
1214 struct hfi1_user_sdma_comp_q *cq,
1215 u16 idx, enum hfi1_sdma_comp_state state,
1216 int ret)
1217{
1218 if (state == ERROR)
1219 cq->comps[idx].errcode = -ret;
1220 smp_wmb(); /* make sure errcode is visible first */
1221 cq->comps[idx].status = state;
1222 trace_hfi1_sdma_user_completion(pq->dd, pq->ctxt, pq->subctxt,
1223 idx, state, ret);
1224}
1/*
2 * Copyright(c) 2015 - 2018 Intel Corporation.
3 *
4 * This file is provided under a dual BSD/GPLv2 license. When using or
5 * redistributing this file, you may do so under either license.
6 *
7 * GPL LICENSE SUMMARY
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of version 2 of the GNU General Public License as
11 * published by the Free Software Foundation.
12 *
13 * This program is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * General Public License for more details.
17 *
18 * BSD LICENSE
19 *
20 * Redistribution and use in source and binary forms, with or without
21 * modification, are permitted provided that the following conditions
22 * are met:
23 *
24 * - Redistributions of source code must retain the above copyright
25 * notice, this list of conditions and the following disclaimer.
26 * - Redistributions in binary form must reproduce the above copyright
27 * notice, this list of conditions and the following disclaimer in
28 * the documentation and/or other materials provided with the
29 * distribution.
30 * - Neither the name of Intel Corporation nor the names of its
31 * contributors may be used to endorse or promote products derived
32 * from this software without specific prior written permission.
33 *
34 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
35 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
36 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
37 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
38 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
39 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
40 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
41 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
42 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
43 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
44 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
45 *
46 */
47#include <linux/mm.h>
48#include <linux/types.h>
49#include <linux/device.h>
50#include <linux/dmapool.h>
51#include <linux/slab.h>
52#include <linux/list.h>
53#include <linux/highmem.h>
54#include <linux/io.h>
55#include <linux/uio.h>
56#include <linux/rbtree.h>
57#include <linux/spinlock.h>
58#include <linux/delay.h>
59#include <linux/kthread.h>
60#include <linux/mmu_context.h>
61#include <linux/module.h>
62#include <linux/vmalloc.h>
63#include <linux/string.h>
64
65#include "hfi.h"
66#include "sdma.h"
67#include "mmu_rb.h"
68#include "user_sdma.h"
69#include "verbs.h" /* for the headers */
70#include "common.h" /* for struct hfi1_tid_info */
71#include "trace.h"
72
73static uint hfi1_sdma_comp_ring_size = 128;
74module_param_named(sdma_comp_size, hfi1_sdma_comp_ring_size, uint, S_IRUGO);
75MODULE_PARM_DESC(sdma_comp_size, "Size of User SDMA completion ring. Default: 128");
76
77static unsigned initial_pkt_count = 8;
78
79static int user_sdma_send_pkts(struct user_sdma_request *req, u16 maxpkts);
80static void user_sdma_txreq_cb(struct sdma_txreq *txreq, int status);
81static inline void pq_update(struct hfi1_user_sdma_pkt_q *pq);
82static void user_sdma_free_request(struct user_sdma_request *req, bool unpin);
83static int pin_vector_pages(struct user_sdma_request *req,
84 struct user_sdma_iovec *iovec);
85static void unpin_vector_pages(struct mm_struct *mm, struct page **pages,
86 unsigned start, unsigned npages);
87static int check_header_template(struct user_sdma_request *req,
88 struct hfi1_pkt_header *hdr, u32 lrhlen,
89 u32 datalen);
90static int set_txreq_header(struct user_sdma_request *req,
91 struct user_sdma_txreq *tx, u32 datalen);
92static int set_txreq_header_ahg(struct user_sdma_request *req,
93 struct user_sdma_txreq *tx, u32 len);
94static inline void set_comp_state(struct hfi1_user_sdma_pkt_q *pq,
95 struct hfi1_user_sdma_comp_q *cq,
96 u16 idx, enum hfi1_sdma_comp_state state,
97 int ret);
98static inline u32 set_pkt_bth_psn(__be32 bthpsn, u8 expct, u32 frags);
99static inline u32 get_lrh_len(struct hfi1_pkt_header, u32 len);
100
101static int defer_packet_queue(
102 struct sdma_engine *sde,
103 struct iowait_work *wait,
104 struct sdma_txreq *txreq,
105 uint seq,
106 bool pkts_sent);
107static void activate_packet_queue(struct iowait *wait, int reason);
108static bool sdma_rb_filter(struct mmu_rb_node *node, unsigned long addr,
109 unsigned long len);
110static int sdma_rb_insert(void *arg, struct mmu_rb_node *mnode);
111static int sdma_rb_evict(void *arg, struct mmu_rb_node *mnode,
112 void *arg2, bool *stop);
113static void sdma_rb_remove(void *arg, struct mmu_rb_node *mnode);
114static int sdma_rb_invalidate(void *arg, struct mmu_rb_node *mnode);
115
116static struct mmu_rb_ops sdma_rb_ops = {
117 .filter = sdma_rb_filter,
118 .insert = sdma_rb_insert,
119 .evict = sdma_rb_evict,
120 .remove = sdma_rb_remove,
121 .invalidate = sdma_rb_invalidate
122};
123
124static int defer_packet_queue(
125 struct sdma_engine *sde,
126 struct iowait_work *wait,
127 struct sdma_txreq *txreq,
128 uint seq,
129 bool pkts_sent)
130{
131 struct hfi1_user_sdma_pkt_q *pq =
132 container_of(wait->iow, struct hfi1_user_sdma_pkt_q, busy);
133
134 write_seqlock(&sde->waitlock);
135 if (sdma_progress(sde, seq, txreq))
136 goto eagain;
137 /*
138 * We are assuming that if the list is enqueued somewhere, it
139 * is to the dmawait list since that is the only place where
140 * it is supposed to be enqueued.
141 */
142 xchg(&pq->state, SDMA_PKT_Q_DEFERRED);
143 if (list_empty(&pq->busy.list)) {
144 pq->busy.lock = &sde->waitlock;
145 iowait_get_priority(&pq->busy);
146 iowait_queue(pkts_sent, &pq->busy, &sde->dmawait);
147 }
148 write_sequnlock(&sde->waitlock);
149 return -EBUSY;
150eagain:
151 write_sequnlock(&sde->waitlock);
152 return -EAGAIN;
153}
154
155static void activate_packet_queue(struct iowait *wait, int reason)
156{
157 struct hfi1_user_sdma_pkt_q *pq =
158 container_of(wait, struct hfi1_user_sdma_pkt_q, busy);
159 pq->busy.lock = NULL;
160 xchg(&pq->state, SDMA_PKT_Q_ACTIVE);
161 wake_up(&wait->wait_dma);
162};
163
164int hfi1_user_sdma_alloc_queues(struct hfi1_ctxtdata *uctxt,
165 struct hfi1_filedata *fd)
166{
167 int ret = -ENOMEM;
168 char buf[64];
169 struct hfi1_devdata *dd;
170 struct hfi1_user_sdma_comp_q *cq;
171 struct hfi1_user_sdma_pkt_q *pq;
172
173 if (!uctxt || !fd)
174 return -EBADF;
175
176 if (!hfi1_sdma_comp_ring_size)
177 return -EINVAL;
178
179 dd = uctxt->dd;
180
181 pq = kzalloc(sizeof(*pq), GFP_KERNEL);
182 if (!pq)
183 return -ENOMEM;
184 pq->dd = dd;
185 pq->ctxt = uctxt->ctxt;
186 pq->subctxt = fd->subctxt;
187 pq->n_max_reqs = hfi1_sdma_comp_ring_size;
188 atomic_set(&pq->n_reqs, 0);
189 init_waitqueue_head(&pq->wait);
190 atomic_set(&pq->n_locked, 0);
191 pq->mm = fd->mm;
192
193 iowait_init(&pq->busy, 0, NULL, NULL, defer_packet_queue,
194 activate_packet_queue, NULL, NULL);
195 pq->reqidx = 0;
196
197 pq->reqs = kcalloc(hfi1_sdma_comp_ring_size,
198 sizeof(*pq->reqs),
199 GFP_KERNEL);
200 if (!pq->reqs)
201 goto pq_reqs_nomem;
202
203 pq->req_in_use = kcalloc(BITS_TO_LONGS(hfi1_sdma_comp_ring_size),
204 sizeof(*pq->req_in_use),
205 GFP_KERNEL);
206 if (!pq->req_in_use)
207 goto pq_reqs_no_in_use;
208
209 snprintf(buf, 64, "txreq-kmem-cache-%u-%u-%u", dd->unit, uctxt->ctxt,
210 fd->subctxt);
211 pq->txreq_cache = kmem_cache_create(buf,
212 sizeof(struct user_sdma_txreq),
213 L1_CACHE_BYTES,
214 SLAB_HWCACHE_ALIGN,
215 NULL);
216 if (!pq->txreq_cache) {
217 dd_dev_err(dd, "[%u] Failed to allocate TxReq cache\n",
218 uctxt->ctxt);
219 goto pq_txreq_nomem;
220 }
221
222 cq = kzalloc(sizeof(*cq), GFP_KERNEL);
223 if (!cq)
224 goto cq_nomem;
225
226 cq->comps = vmalloc_user(PAGE_ALIGN(sizeof(*cq->comps)
227 * hfi1_sdma_comp_ring_size));
228 if (!cq->comps)
229 goto cq_comps_nomem;
230
231 cq->nentries = hfi1_sdma_comp_ring_size;
232
233 ret = hfi1_mmu_rb_register(pq, pq->mm, &sdma_rb_ops, dd->pport->hfi1_wq,
234 &pq->handler);
235 if (ret) {
236 dd_dev_err(dd, "Failed to register with MMU %d", ret);
237 goto pq_mmu_fail;
238 }
239
240 rcu_assign_pointer(fd->pq, pq);
241 fd->cq = cq;
242
243 return 0;
244
245pq_mmu_fail:
246 vfree(cq->comps);
247cq_comps_nomem:
248 kfree(cq);
249cq_nomem:
250 kmem_cache_destroy(pq->txreq_cache);
251pq_txreq_nomem:
252 kfree(pq->req_in_use);
253pq_reqs_no_in_use:
254 kfree(pq->reqs);
255pq_reqs_nomem:
256 kfree(pq);
257
258 return ret;
259}
260
261static void flush_pq_iowait(struct hfi1_user_sdma_pkt_q *pq)
262{
263 unsigned long flags;
264 seqlock_t *lock = pq->busy.lock;
265
266 if (!lock)
267 return;
268 write_seqlock_irqsave(lock, flags);
269 if (!list_empty(&pq->busy.list)) {
270 list_del_init(&pq->busy.list);
271 pq->busy.lock = NULL;
272 }
273 write_sequnlock_irqrestore(lock, flags);
274}
275
276int hfi1_user_sdma_free_queues(struct hfi1_filedata *fd,
277 struct hfi1_ctxtdata *uctxt)
278{
279 struct hfi1_user_sdma_pkt_q *pq;
280
281 trace_hfi1_sdma_user_free_queues(uctxt->dd, uctxt->ctxt, fd->subctxt);
282
283 spin_lock(&fd->pq_rcu_lock);
284 pq = srcu_dereference_check(fd->pq, &fd->pq_srcu,
285 lockdep_is_held(&fd->pq_rcu_lock));
286 if (pq) {
287 rcu_assign_pointer(fd->pq, NULL);
288 spin_unlock(&fd->pq_rcu_lock);
289 synchronize_srcu(&fd->pq_srcu);
290 /* at this point there can be no more new requests */
291 if (pq->handler)
292 hfi1_mmu_rb_unregister(pq->handler);
293 iowait_sdma_drain(&pq->busy);
294 /* Wait until all requests have been freed. */
295 wait_event_interruptible(
296 pq->wait,
297 !atomic_read(&pq->n_reqs));
298 kfree(pq->reqs);
299 kfree(pq->req_in_use);
300 kmem_cache_destroy(pq->txreq_cache);
301 flush_pq_iowait(pq);
302 kfree(pq);
303 } else {
304 spin_unlock(&fd->pq_rcu_lock);
305 }
306 if (fd->cq) {
307 vfree(fd->cq->comps);
308 kfree(fd->cq);
309 fd->cq = NULL;
310 }
311 return 0;
312}
313
314static u8 dlid_to_selector(u16 dlid)
315{
316 static u8 mapping[256];
317 static int initialized;
318 static u8 next;
319 int hash;
320
321 if (!initialized) {
322 memset(mapping, 0xFF, 256);
323 initialized = 1;
324 }
325
326 hash = ((dlid >> 8) ^ dlid) & 0xFF;
327 if (mapping[hash] == 0xFF) {
328 mapping[hash] = next;
329 next = (next + 1) & 0x7F;
330 }
331
332 return mapping[hash];
333}
334
335/**
336 * hfi1_user_sdma_process_request() - Process and start a user sdma request
337 * @fd: valid file descriptor
338 * @iovec: array of io vectors to process
339 * @dim: overall iovec array size
340 * @count: number of io vector array entries processed
341 */
342int hfi1_user_sdma_process_request(struct hfi1_filedata *fd,
343 struct iovec *iovec, unsigned long dim,
344 unsigned long *count)
345{
346 int ret = 0, i;
347 struct hfi1_ctxtdata *uctxt = fd->uctxt;
348 struct hfi1_user_sdma_pkt_q *pq =
349 srcu_dereference(fd->pq, &fd->pq_srcu);
350 struct hfi1_user_sdma_comp_q *cq = fd->cq;
351 struct hfi1_devdata *dd = pq->dd;
352 unsigned long idx = 0;
353 u8 pcount = initial_pkt_count;
354 struct sdma_req_info info;
355 struct user_sdma_request *req;
356 u8 opcode, sc, vl;
357 u16 pkey;
358 u32 slid;
359 u16 dlid;
360 u32 selector;
361
362 if (iovec[idx].iov_len < sizeof(info) + sizeof(req->hdr)) {
363 hfi1_cdbg(
364 SDMA,
365 "[%u:%u:%u] First vector not big enough for header %lu/%lu",
366 dd->unit, uctxt->ctxt, fd->subctxt,
367 iovec[idx].iov_len, sizeof(info) + sizeof(req->hdr));
368 return -EINVAL;
369 }
370 ret = copy_from_user(&info, iovec[idx].iov_base, sizeof(info));
371 if (ret) {
372 hfi1_cdbg(SDMA, "[%u:%u:%u] Failed to copy info QW (%d)",
373 dd->unit, uctxt->ctxt, fd->subctxt, ret);
374 return -EFAULT;
375 }
376
377 trace_hfi1_sdma_user_reqinfo(dd, uctxt->ctxt, fd->subctxt,
378 (u16 *)&info);
379 if (info.comp_idx >= hfi1_sdma_comp_ring_size) {
380 hfi1_cdbg(SDMA,
381 "[%u:%u:%u:%u] Invalid comp index",
382 dd->unit, uctxt->ctxt, fd->subctxt, info.comp_idx);
383 return -EINVAL;
384 }
385
386 /*
387 * Sanity check the header io vector count. Need at least 1 vector
388 * (header) and cannot be larger than the actual io vector count.
389 */
390 if (req_iovcnt(info.ctrl) < 1 || req_iovcnt(info.ctrl) > dim) {
391 hfi1_cdbg(SDMA,
392 "[%u:%u:%u:%u] Invalid iov count %d, dim %ld",
393 dd->unit, uctxt->ctxt, fd->subctxt, info.comp_idx,
394 req_iovcnt(info.ctrl), dim);
395 return -EINVAL;
396 }
397
398 if (!info.fragsize) {
399 hfi1_cdbg(SDMA,
400 "[%u:%u:%u:%u] Request does not specify fragsize",
401 dd->unit, uctxt->ctxt, fd->subctxt, info.comp_idx);
402 return -EINVAL;
403 }
404
405 /* Try to claim the request. */
406 if (test_and_set_bit(info.comp_idx, pq->req_in_use)) {
407 hfi1_cdbg(SDMA, "[%u:%u:%u] Entry %u is in use",
408 dd->unit, uctxt->ctxt, fd->subctxt,
409 info.comp_idx);
410 return -EBADSLT;
411 }
412 /*
413 * All safety checks have been done and this request has been claimed.
414 */
415 trace_hfi1_sdma_user_process_request(dd, uctxt->ctxt, fd->subctxt,
416 info.comp_idx);
417 req = pq->reqs + info.comp_idx;
418 req->data_iovs = req_iovcnt(info.ctrl) - 1; /* subtract header vector */
419 req->data_len = 0;
420 req->pq = pq;
421 req->cq = cq;
422 req->ahg_idx = -1;
423 req->iov_idx = 0;
424 req->sent = 0;
425 req->seqnum = 0;
426 req->seqcomp = 0;
427 req->seqsubmitted = 0;
428 req->tids = NULL;
429 req->has_error = 0;
430 INIT_LIST_HEAD(&req->txps);
431
432 memcpy(&req->info, &info, sizeof(info));
433
434 /* The request is initialized, count it */
435 atomic_inc(&pq->n_reqs);
436
437 if (req_opcode(info.ctrl) == EXPECTED) {
438 /* expected must have a TID info and at least one data vector */
439 if (req->data_iovs < 2) {
440 SDMA_DBG(req,
441 "Not enough vectors for expected request");
442 ret = -EINVAL;
443 goto free_req;
444 }
445 req->data_iovs--;
446 }
447
448 if (!info.npkts || req->data_iovs > MAX_VECTORS_PER_REQ) {
449 SDMA_DBG(req, "Too many vectors (%u/%u)", req->data_iovs,
450 MAX_VECTORS_PER_REQ);
451 ret = -EINVAL;
452 goto free_req;
453 }
454 /* Copy the header from the user buffer */
455 ret = copy_from_user(&req->hdr, iovec[idx].iov_base + sizeof(info),
456 sizeof(req->hdr));
457 if (ret) {
458 SDMA_DBG(req, "Failed to copy header template (%d)", ret);
459 ret = -EFAULT;
460 goto free_req;
461 }
462
463 /* If Static rate control is not enabled, sanitize the header. */
464 if (!HFI1_CAP_IS_USET(STATIC_RATE_CTRL))
465 req->hdr.pbc[2] = 0;
466
467 /* Validate the opcode. Do not trust packets from user space blindly. */
468 opcode = (be32_to_cpu(req->hdr.bth[0]) >> 24) & 0xff;
469 if ((opcode & USER_OPCODE_CHECK_MASK) !=
470 USER_OPCODE_CHECK_VAL) {
471 SDMA_DBG(req, "Invalid opcode (%d)", opcode);
472 ret = -EINVAL;
473 goto free_req;
474 }
475 /*
476 * Validate the vl. Do not trust packets from user space blindly.
477 * VL comes from PBC, SC comes from LRH, and the VL needs to
478 * match the SC look up.
479 */
480 vl = (le16_to_cpu(req->hdr.pbc[0]) >> 12) & 0xF;
481 sc = (((be16_to_cpu(req->hdr.lrh[0]) >> 12) & 0xF) |
482 (((le16_to_cpu(req->hdr.pbc[1]) >> 14) & 0x1) << 4));
483 if (vl >= dd->pport->vls_operational ||
484 vl != sc_to_vlt(dd, sc)) {
485 SDMA_DBG(req, "Invalid SC(%u)/VL(%u)", sc, vl);
486 ret = -EINVAL;
487 goto free_req;
488 }
489
490 /* Checking P_KEY for requests from user-space */
491 pkey = (u16)be32_to_cpu(req->hdr.bth[0]);
492 slid = be16_to_cpu(req->hdr.lrh[3]);
493 if (egress_pkey_check(dd->pport, slid, pkey, sc, PKEY_CHECK_INVALID)) {
494 ret = -EINVAL;
495 goto free_req;
496 }
497
498 /*
499 * Also should check the BTH.lnh. If it says the next header is GRH then
500 * the RXE parsing will be off and will land in the middle of the KDETH
501 * or miss it entirely.
502 */
503 if ((be16_to_cpu(req->hdr.lrh[0]) & 0x3) == HFI1_LRH_GRH) {
504 SDMA_DBG(req, "User tried to pass in a GRH");
505 ret = -EINVAL;
506 goto free_req;
507 }
508
509 req->koffset = le32_to_cpu(req->hdr.kdeth.swdata[6]);
510 /*
511 * Calculate the initial TID offset based on the values of
512 * KDETH.OFFSET and KDETH.OM that are passed in.
513 */
514 req->tidoffset = KDETH_GET(req->hdr.kdeth.ver_tid_offset, OFFSET) *
515 (KDETH_GET(req->hdr.kdeth.ver_tid_offset, OM) ?
516 KDETH_OM_LARGE : KDETH_OM_SMALL);
517 trace_hfi1_sdma_user_initial_tidoffset(dd, uctxt->ctxt, fd->subctxt,
518 info.comp_idx, req->tidoffset);
519 idx++;
520
521 /* Save all the IO vector structures */
522 for (i = 0; i < req->data_iovs; i++) {
523 req->iovs[i].offset = 0;
524 INIT_LIST_HEAD(&req->iovs[i].list);
525 memcpy(&req->iovs[i].iov,
526 iovec + idx++,
527 sizeof(req->iovs[i].iov));
528 ret = pin_vector_pages(req, &req->iovs[i]);
529 if (ret) {
530 req->data_iovs = i;
531 goto free_req;
532 }
533 req->data_len += req->iovs[i].iov.iov_len;
534 }
535 trace_hfi1_sdma_user_data_length(dd, uctxt->ctxt, fd->subctxt,
536 info.comp_idx, req->data_len);
537 if (pcount > req->info.npkts)
538 pcount = req->info.npkts;
539 /*
540 * Copy any TID info
541 * User space will provide the TID info only when the
542 * request type is EXPECTED. This is true even if there is
543 * only one packet in the request and the header is already
544 * setup. The reason for the singular TID case is that the
545 * driver needs to perform safety checks.
546 */
547 if (req_opcode(req->info.ctrl) == EXPECTED) {
548 u16 ntids = iovec[idx].iov_len / sizeof(*req->tids);
549 u32 *tmp;
550
551 if (!ntids || ntids > MAX_TID_PAIR_ENTRIES) {
552 ret = -EINVAL;
553 goto free_req;
554 }
555
556 /*
557 * We have to copy all of the tids because they may vary
558 * in size and, therefore, the TID count might not be
559 * equal to the pkt count. However, there is no way to
560 * tell at this point.
561 */
562 tmp = memdup_user(iovec[idx].iov_base,
563 ntids * sizeof(*req->tids));
564 if (IS_ERR(tmp)) {
565 ret = PTR_ERR(tmp);
566 SDMA_DBG(req, "Failed to copy %d TIDs (%d)",
567 ntids, ret);
568 goto free_req;
569 }
570 req->tids = tmp;
571 req->n_tids = ntids;
572 req->tididx = 0;
573 idx++;
574 }
575
576 dlid = be16_to_cpu(req->hdr.lrh[1]);
577 selector = dlid_to_selector(dlid);
578 selector += uctxt->ctxt + fd->subctxt;
579 req->sde = sdma_select_user_engine(dd, selector, vl);
580
581 if (!req->sde || !sdma_running(req->sde)) {
582 ret = -ECOMM;
583 goto free_req;
584 }
585
586 /* We don't need an AHG entry if the request contains only one packet */
587 if (req->info.npkts > 1 && HFI1_CAP_IS_USET(SDMA_AHG))
588 req->ahg_idx = sdma_ahg_alloc(req->sde);
589
590 set_comp_state(pq, cq, info.comp_idx, QUEUED, 0);
591 pq->state = SDMA_PKT_Q_ACTIVE;
592
593 /*
594 * This is a somewhat blocking send implementation.
595 * The driver will block the caller until all packets of the
596 * request have been submitted to the SDMA engine. However, it
597 * will not wait for send completions.
598 */
599 while (req->seqsubmitted != req->info.npkts) {
600 ret = user_sdma_send_pkts(req, pcount);
601 if (ret < 0) {
602 if (ret != -EBUSY)
603 goto free_req;
604 if (wait_event_interruptible_timeout(
605 pq->busy.wait_dma,
606 pq->state == SDMA_PKT_Q_ACTIVE,
607 msecs_to_jiffies(
608 SDMA_IOWAIT_TIMEOUT)) <= 0)
609 flush_pq_iowait(pq);
610 }
611 }
612 *count += idx;
613 return 0;
614free_req:
615 /*
616 * If the submitted seqsubmitted == npkts, the completion routine
617 * controls the final state. If sequbmitted < npkts, wait for any
618 * outstanding packets to finish before cleaning up.
619 */
620 if (req->seqsubmitted < req->info.npkts) {
621 if (req->seqsubmitted)
622 wait_event(pq->busy.wait_dma,
623 (req->seqcomp == req->seqsubmitted - 1));
624 user_sdma_free_request(req, true);
625 pq_update(pq);
626 set_comp_state(pq, cq, info.comp_idx, ERROR, ret);
627 }
628 return ret;
629}
630
631static inline u32 compute_data_length(struct user_sdma_request *req,
632 struct user_sdma_txreq *tx)
633{
634 /*
635 * Determine the proper size of the packet data.
636 * The size of the data of the first packet is in the header
637 * template. However, it includes the header and ICRC, which need
638 * to be subtracted.
639 * The minimum representable packet data length in a header is 4 bytes,
640 * therefore, when the data length request is less than 4 bytes, there's
641 * only one packet, and the packet data length is equal to that of the
642 * request data length.
643 * The size of the remaining packets is the minimum of the frag
644 * size (MTU) or remaining data in the request.
645 */
646 u32 len;
647
648 if (!req->seqnum) {
649 if (req->data_len < sizeof(u32))
650 len = req->data_len;
651 else
652 len = ((be16_to_cpu(req->hdr.lrh[2]) << 2) -
653 (sizeof(tx->hdr) - 4));
654 } else if (req_opcode(req->info.ctrl) == EXPECTED) {
655 u32 tidlen = EXP_TID_GET(req->tids[req->tididx], LEN) *
656 PAGE_SIZE;
657 /*
658 * Get the data length based on the remaining space in the
659 * TID pair.
660 */
661 len = min(tidlen - req->tidoffset, (u32)req->info.fragsize);
662 /* If we've filled up the TID pair, move to the next one. */
663 if (unlikely(!len) && ++req->tididx < req->n_tids &&
664 req->tids[req->tididx]) {
665 tidlen = EXP_TID_GET(req->tids[req->tididx],
666 LEN) * PAGE_SIZE;
667 req->tidoffset = 0;
668 len = min_t(u32, tidlen, req->info.fragsize);
669 }
670 /*
671 * Since the TID pairs map entire pages, make sure that we
672 * are not going to try to send more data that we have
673 * remaining.
674 */
675 len = min(len, req->data_len - req->sent);
676 } else {
677 len = min(req->data_len - req->sent, (u32)req->info.fragsize);
678 }
679 trace_hfi1_sdma_user_compute_length(req->pq->dd,
680 req->pq->ctxt,
681 req->pq->subctxt,
682 req->info.comp_idx,
683 len);
684 return len;
685}
686
687static inline u32 pad_len(u32 len)
688{
689 if (len & (sizeof(u32) - 1))
690 len += sizeof(u32) - (len & (sizeof(u32) - 1));
691 return len;
692}
693
694static inline u32 get_lrh_len(struct hfi1_pkt_header hdr, u32 len)
695{
696 /* (Size of complete header - size of PBC) + 4B ICRC + data length */
697 return ((sizeof(hdr) - sizeof(hdr.pbc)) + 4 + len);
698}
699
700static int user_sdma_txadd_ahg(struct user_sdma_request *req,
701 struct user_sdma_txreq *tx,
702 u32 datalen)
703{
704 int ret;
705 u16 pbclen = le16_to_cpu(req->hdr.pbc[0]);
706 u32 lrhlen = get_lrh_len(req->hdr, pad_len(datalen));
707 struct hfi1_user_sdma_pkt_q *pq = req->pq;
708
709 /*
710 * Copy the request header into the tx header
711 * because the HW needs a cacheline-aligned
712 * address.
713 * This copy can be optimized out if the hdr
714 * member of user_sdma_request were also
715 * cacheline aligned.
716 */
717 memcpy(&tx->hdr, &req->hdr, sizeof(tx->hdr));
718 if (PBC2LRH(pbclen) != lrhlen) {
719 pbclen = (pbclen & 0xf000) | LRH2PBC(lrhlen);
720 tx->hdr.pbc[0] = cpu_to_le16(pbclen);
721 }
722 ret = check_header_template(req, &tx->hdr, lrhlen, datalen);
723 if (ret)
724 return ret;
725 ret = sdma_txinit_ahg(&tx->txreq, SDMA_TXREQ_F_AHG_COPY,
726 sizeof(tx->hdr) + datalen, req->ahg_idx,
727 0, NULL, 0, user_sdma_txreq_cb);
728 if (ret)
729 return ret;
730 ret = sdma_txadd_kvaddr(pq->dd, &tx->txreq, &tx->hdr, sizeof(tx->hdr));
731 if (ret)
732 sdma_txclean(pq->dd, &tx->txreq);
733 return ret;
734}
735
736static int user_sdma_txadd(struct user_sdma_request *req,
737 struct user_sdma_txreq *tx,
738 struct user_sdma_iovec *iovec, u32 datalen,
739 u32 *queued_ptr, u32 *data_sent_ptr,
740 u64 *iov_offset_ptr)
741{
742 int ret;
743 unsigned int pageidx, len;
744 unsigned long base, offset;
745 u64 iov_offset = *iov_offset_ptr;
746 u32 queued = *queued_ptr, data_sent = *data_sent_ptr;
747 struct hfi1_user_sdma_pkt_q *pq = req->pq;
748
749 base = (unsigned long)iovec->iov.iov_base;
750 offset = offset_in_page(base + iovec->offset + iov_offset);
751 pageidx = (((iovec->offset + iov_offset + base) - (base & PAGE_MASK)) >>
752 PAGE_SHIFT);
753 len = offset + req->info.fragsize > PAGE_SIZE ?
754 PAGE_SIZE - offset : req->info.fragsize;
755 len = min((datalen - queued), len);
756 ret = sdma_txadd_page(pq->dd, &tx->txreq, iovec->pages[pageidx],
757 offset, len);
758 if (ret) {
759 SDMA_DBG(req, "SDMA txreq add page failed %d\n", ret);
760 return ret;
761 }
762 iov_offset += len;
763 queued += len;
764 data_sent += len;
765 if (unlikely(queued < datalen && pageidx == iovec->npages &&
766 req->iov_idx < req->data_iovs - 1)) {
767 iovec->offset += iov_offset;
768 iovec = &req->iovs[++req->iov_idx];
769 iov_offset = 0;
770 }
771
772 *queued_ptr = queued;
773 *data_sent_ptr = data_sent;
774 *iov_offset_ptr = iov_offset;
775 return ret;
776}
777
778static int user_sdma_send_pkts(struct user_sdma_request *req, u16 maxpkts)
779{
780 int ret = 0;
781 u16 count;
782 unsigned npkts = 0;
783 struct user_sdma_txreq *tx = NULL;
784 struct hfi1_user_sdma_pkt_q *pq = NULL;
785 struct user_sdma_iovec *iovec = NULL;
786
787 if (!req->pq)
788 return -EINVAL;
789
790 pq = req->pq;
791
792 /* If tx completion has reported an error, we are done. */
793 if (READ_ONCE(req->has_error))
794 return -EFAULT;
795
796 /*
797 * Check if we might have sent the entire request already
798 */
799 if (unlikely(req->seqnum == req->info.npkts)) {
800 if (!list_empty(&req->txps))
801 goto dosend;
802 return ret;
803 }
804
805 if (!maxpkts || maxpkts > req->info.npkts - req->seqnum)
806 maxpkts = req->info.npkts - req->seqnum;
807
808 while (npkts < maxpkts) {
809 u32 datalen = 0, queued = 0, data_sent = 0;
810 u64 iov_offset = 0;
811
812 /*
813 * Check whether any of the completions have come back
814 * with errors. If so, we are not going to process any
815 * more packets from this request.
816 */
817 if (READ_ONCE(req->has_error))
818 return -EFAULT;
819
820 tx = kmem_cache_alloc(pq->txreq_cache, GFP_KERNEL);
821 if (!tx)
822 return -ENOMEM;
823
824 tx->flags = 0;
825 tx->req = req;
826 INIT_LIST_HEAD(&tx->list);
827
828 /*
829 * For the last packet set the ACK request
830 * and disable header suppression.
831 */
832 if (req->seqnum == req->info.npkts - 1)
833 tx->flags |= (TXREQ_FLAGS_REQ_ACK |
834 TXREQ_FLAGS_REQ_DISABLE_SH);
835
836 /*
837 * Calculate the payload size - this is min of the fragment
838 * (MTU) size or the remaining bytes in the request but only
839 * if we have payload data.
840 */
841 if (req->data_len) {
842 iovec = &req->iovs[req->iov_idx];
843 if (READ_ONCE(iovec->offset) == iovec->iov.iov_len) {
844 if (++req->iov_idx == req->data_iovs) {
845 ret = -EFAULT;
846 goto free_tx;
847 }
848 iovec = &req->iovs[req->iov_idx];
849 WARN_ON(iovec->offset);
850 }
851
852 datalen = compute_data_length(req, tx);
853
854 /*
855 * Disable header suppression for the payload <= 8DWS.
856 * If there is an uncorrectable error in the receive
857 * data FIFO when the received payload size is less than
858 * or equal to 8DWS then the RxDmaDataFifoRdUncErr is
859 * not reported.There is set RHF.EccErr if the header
860 * is not suppressed.
861 */
862 if (!datalen) {
863 SDMA_DBG(req,
864 "Request has data but pkt len is 0");
865 ret = -EFAULT;
866 goto free_tx;
867 } else if (datalen <= 32) {
868 tx->flags |= TXREQ_FLAGS_REQ_DISABLE_SH;
869 }
870 }
871
872 if (req->ahg_idx >= 0) {
873 if (!req->seqnum) {
874 ret = user_sdma_txadd_ahg(req, tx, datalen);
875 if (ret)
876 goto free_tx;
877 } else {
878 int changes;
879
880 changes = set_txreq_header_ahg(req, tx,
881 datalen);
882 if (changes < 0) {
883 ret = changes;
884 goto free_tx;
885 }
886 }
887 } else {
888 ret = sdma_txinit(&tx->txreq, 0, sizeof(req->hdr) +
889 datalen, user_sdma_txreq_cb);
890 if (ret)
891 goto free_tx;
892 /*
893 * Modify the header for this packet. This only needs
894 * to be done if we are not going to use AHG. Otherwise,
895 * the HW will do it based on the changes we gave it
896 * during sdma_txinit_ahg().
897 */
898 ret = set_txreq_header(req, tx, datalen);
899 if (ret)
900 goto free_txreq;
901 }
902
903 /*
904 * If the request contains any data vectors, add up to
905 * fragsize bytes to the descriptor.
906 */
907 while (queued < datalen &&
908 (req->sent + data_sent) < req->data_len) {
909 ret = user_sdma_txadd(req, tx, iovec, datalen,
910 &queued, &data_sent, &iov_offset);
911 if (ret)
912 goto free_txreq;
913 }
914 /*
915 * The txreq was submitted successfully so we can update
916 * the counters.
917 */
918 req->koffset += datalen;
919 if (req_opcode(req->info.ctrl) == EXPECTED)
920 req->tidoffset += datalen;
921 req->sent += data_sent;
922 if (req->data_len)
923 iovec->offset += iov_offset;
924 list_add_tail(&tx->txreq.list, &req->txps);
925 /*
926 * It is important to increment this here as it is used to
927 * generate the BTH.PSN and, therefore, can't be bulk-updated
928 * outside of the loop.
929 */
930 tx->seqnum = req->seqnum++;
931 npkts++;
932 }
933dosend:
934 ret = sdma_send_txlist(req->sde,
935 iowait_get_ib_work(&pq->busy),
936 &req->txps, &count);
937 req->seqsubmitted += count;
938 if (req->seqsubmitted == req->info.npkts) {
939 /*
940 * The txreq has already been submitted to the HW queue
941 * so we can free the AHG entry now. Corruption will not
942 * happen due to the sequential manner in which
943 * descriptors are processed.
944 */
945 if (req->ahg_idx >= 0)
946 sdma_ahg_free(req->sde, req->ahg_idx);
947 }
948 return ret;
949
950free_txreq:
951 sdma_txclean(pq->dd, &tx->txreq);
952free_tx:
953 kmem_cache_free(pq->txreq_cache, tx);
954 return ret;
955}
956
957static u32 sdma_cache_evict(struct hfi1_user_sdma_pkt_q *pq, u32 npages)
958{
959 struct evict_data evict_data;
960
961 evict_data.cleared = 0;
962 evict_data.target = npages;
963 hfi1_mmu_rb_evict(pq->handler, &evict_data);
964 return evict_data.cleared;
965}
966
967static int pin_sdma_pages(struct user_sdma_request *req,
968 struct user_sdma_iovec *iovec,
969 struct sdma_mmu_node *node,
970 int npages)
971{
972 int pinned, cleared;
973 struct page **pages;
974 struct hfi1_user_sdma_pkt_q *pq = req->pq;
975
976 pages = kcalloc(npages, sizeof(*pages), GFP_KERNEL);
977 if (!pages)
978 return -ENOMEM;
979 memcpy(pages, node->pages, node->npages * sizeof(*pages));
980
981 npages -= node->npages;
982retry:
983 if (!hfi1_can_pin_pages(pq->dd, pq->mm,
984 atomic_read(&pq->n_locked), npages)) {
985 cleared = sdma_cache_evict(pq, npages);
986 if (cleared >= npages)
987 goto retry;
988 }
989 pinned = hfi1_acquire_user_pages(pq->mm,
990 ((unsigned long)iovec->iov.iov_base +
991 (node->npages * PAGE_SIZE)), npages, 0,
992 pages + node->npages);
993 if (pinned < 0) {
994 kfree(pages);
995 return pinned;
996 }
997 if (pinned != npages) {
998 unpin_vector_pages(pq->mm, pages, node->npages, pinned);
999 return -EFAULT;
1000 }
1001 kfree(node->pages);
1002 node->rb.len = iovec->iov.iov_len;
1003 node->pages = pages;
1004 atomic_add(pinned, &pq->n_locked);
1005 return pinned;
1006}
1007
1008static void unpin_sdma_pages(struct sdma_mmu_node *node)
1009{
1010 if (node->npages) {
1011 unpin_vector_pages(node->pq->mm, node->pages, 0, node->npages);
1012 atomic_sub(node->npages, &node->pq->n_locked);
1013 }
1014}
1015
1016static int pin_vector_pages(struct user_sdma_request *req,
1017 struct user_sdma_iovec *iovec)
1018{
1019 int ret = 0, pinned, npages;
1020 struct hfi1_user_sdma_pkt_q *pq = req->pq;
1021 struct sdma_mmu_node *node = NULL;
1022 struct mmu_rb_node *rb_node;
1023 struct iovec *iov;
1024 bool extracted;
1025
1026 extracted =
1027 hfi1_mmu_rb_remove_unless_exact(pq->handler,
1028 (unsigned long)
1029 iovec->iov.iov_base,
1030 iovec->iov.iov_len, &rb_node);
1031 if (rb_node) {
1032 node = container_of(rb_node, struct sdma_mmu_node, rb);
1033 if (!extracted) {
1034 atomic_inc(&node->refcount);
1035 iovec->pages = node->pages;
1036 iovec->npages = node->npages;
1037 iovec->node = node;
1038 return 0;
1039 }
1040 }
1041
1042 if (!node) {
1043 node = kzalloc(sizeof(*node), GFP_KERNEL);
1044 if (!node)
1045 return -ENOMEM;
1046
1047 node->rb.addr = (unsigned long)iovec->iov.iov_base;
1048 node->pq = pq;
1049 atomic_set(&node->refcount, 0);
1050 }
1051
1052 iov = &iovec->iov;
1053 npages = num_user_pages((unsigned long)iov->iov_base, iov->iov_len);
1054 if (node->npages < npages) {
1055 pinned = pin_sdma_pages(req, iovec, node, npages);
1056 if (pinned < 0) {
1057 ret = pinned;
1058 goto bail;
1059 }
1060 node->npages += pinned;
1061 npages = node->npages;
1062 }
1063 iovec->pages = node->pages;
1064 iovec->npages = npages;
1065 iovec->node = node;
1066
1067 ret = hfi1_mmu_rb_insert(req->pq->handler, &node->rb);
1068 if (ret) {
1069 iovec->node = NULL;
1070 goto bail;
1071 }
1072 return 0;
1073bail:
1074 unpin_sdma_pages(node);
1075 kfree(node);
1076 return ret;
1077}
1078
1079static void unpin_vector_pages(struct mm_struct *mm, struct page **pages,
1080 unsigned start, unsigned npages)
1081{
1082 hfi1_release_user_pages(mm, pages + start, npages, false);
1083 kfree(pages);
1084}
1085
1086static int check_header_template(struct user_sdma_request *req,
1087 struct hfi1_pkt_header *hdr, u32 lrhlen,
1088 u32 datalen)
1089{
1090 /*
1091 * Perform safety checks for any type of packet:
1092 * - transfer size is multiple of 64bytes
1093 * - packet length is multiple of 4 bytes
1094 * - packet length is not larger than MTU size
1095 *
1096 * These checks are only done for the first packet of the
1097 * transfer since the header is "given" to us by user space.
1098 * For the remainder of the packets we compute the values.
1099 */
1100 if (req->info.fragsize % PIO_BLOCK_SIZE || lrhlen & 0x3 ||
1101 lrhlen > get_lrh_len(*hdr, req->info.fragsize))
1102 return -EINVAL;
1103
1104 if (req_opcode(req->info.ctrl) == EXPECTED) {
1105 /*
1106 * The header is checked only on the first packet. Furthermore,
1107 * we ensure that at least one TID entry is copied when the
1108 * request is submitted. Therefore, we don't have to verify that
1109 * tididx points to something sane.
1110 */
1111 u32 tidval = req->tids[req->tididx],
1112 tidlen = EXP_TID_GET(tidval, LEN) * PAGE_SIZE,
1113 tididx = EXP_TID_GET(tidval, IDX),
1114 tidctrl = EXP_TID_GET(tidval, CTRL),
1115 tidoff;
1116 __le32 kval = hdr->kdeth.ver_tid_offset;
1117
1118 tidoff = KDETH_GET(kval, OFFSET) *
1119 (KDETH_GET(req->hdr.kdeth.ver_tid_offset, OM) ?
1120 KDETH_OM_LARGE : KDETH_OM_SMALL);
1121 /*
1122 * Expected receive packets have the following
1123 * additional checks:
1124 * - offset is not larger than the TID size
1125 * - TIDCtrl values match between header and TID array
1126 * - TID indexes match between header and TID array
1127 */
1128 if ((tidoff + datalen > tidlen) ||
1129 KDETH_GET(kval, TIDCTRL) != tidctrl ||
1130 KDETH_GET(kval, TID) != tididx)
1131 return -EINVAL;
1132 }
1133 return 0;
1134}
1135
1136/*
1137 * Correctly set the BTH.PSN field based on type of
1138 * transfer - eager packets can just increment the PSN but
1139 * expected packets encode generation and sequence in the
1140 * BTH.PSN field so just incrementing will result in errors.
1141 */
1142static inline u32 set_pkt_bth_psn(__be32 bthpsn, u8 expct, u32 frags)
1143{
1144 u32 val = be32_to_cpu(bthpsn),
1145 mask = (HFI1_CAP_IS_KSET(EXTENDED_PSN) ? 0x7fffffffull :
1146 0xffffffull),
1147 psn = val & mask;
1148 if (expct)
1149 psn = (psn & ~HFI1_KDETH_BTH_SEQ_MASK) |
1150 ((psn + frags) & HFI1_KDETH_BTH_SEQ_MASK);
1151 else
1152 psn = psn + frags;
1153 return psn & mask;
1154}
1155
1156static int set_txreq_header(struct user_sdma_request *req,
1157 struct user_sdma_txreq *tx, u32 datalen)
1158{
1159 struct hfi1_user_sdma_pkt_q *pq = req->pq;
1160 struct hfi1_pkt_header *hdr = &tx->hdr;
1161 u8 omfactor; /* KDETH.OM */
1162 u16 pbclen;
1163 int ret;
1164 u32 tidval = 0, lrhlen = get_lrh_len(*hdr, pad_len(datalen));
1165
1166 /* Copy the header template to the request before modification */
1167 memcpy(hdr, &req->hdr, sizeof(*hdr));
1168
1169 /*
1170 * Check if the PBC and LRH length are mismatched. If so
1171 * adjust both in the header.
1172 */
1173 pbclen = le16_to_cpu(hdr->pbc[0]);
1174 if (PBC2LRH(pbclen) != lrhlen) {
1175 pbclen = (pbclen & 0xf000) | LRH2PBC(lrhlen);
1176 hdr->pbc[0] = cpu_to_le16(pbclen);
1177 hdr->lrh[2] = cpu_to_be16(lrhlen >> 2);
1178 /*
1179 * Third packet
1180 * This is the first packet in the sequence that has
1181 * a "static" size that can be used for the rest of
1182 * the packets (besides the last one).
1183 */
1184 if (unlikely(req->seqnum == 2)) {
1185 /*
1186 * From this point on the lengths in both the
1187 * PBC and LRH are the same until the last
1188 * packet.
1189 * Adjust the template so we don't have to update
1190 * every packet
1191 */
1192 req->hdr.pbc[0] = hdr->pbc[0];
1193 req->hdr.lrh[2] = hdr->lrh[2];
1194 }
1195 }
1196 /*
1197 * We only have to modify the header if this is not the
1198 * first packet in the request. Otherwise, we use the
1199 * header given to us.
1200 */
1201 if (unlikely(!req->seqnum)) {
1202 ret = check_header_template(req, hdr, lrhlen, datalen);
1203 if (ret)
1204 return ret;
1205 goto done;
1206 }
1207
1208 hdr->bth[2] = cpu_to_be32(
1209 set_pkt_bth_psn(hdr->bth[2],
1210 (req_opcode(req->info.ctrl) == EXPECTED),
1211 req->seqnum));
1212
1213 /* Set ACK request on last packet */
1214 if (unlikely(tx->flags & TXREQ_FLAGS_REQ_ACK))
1215 hdr->bth[2] |= cpu_to_be32(1UL << 31);
1216
1217 /* Set the new offset */
1218 hdr->kdeth.swdata[6] = cpu_to_le32(req->koffset);
1219 /* Expected packets have to fill in the new TID information */
1220 if (req_opcode(req->info.ctrl) == EXPECTED) {
1221 tidval = req->tids[req->tididx];
1222 /*
1223 * If the offset puts us at the end of the current TID,
1224 * advance everything.
1225 */
1226 if ((req->tidoffset) == (EXP_TID_GET(tidval, LEN) *
1227 PAGE_SIZE)) {
1228 req->tidoffset = 0;
1229 /*
1230 * Since we don't copy all the TIDs, all at once,
1231 * we have to check again.
1232 */
1233 if (++req->tididx > req->n_tids - 1 ||
1234 !req->tids[req->tididx]) {
1235 return -EINVAL;
1236 }
1237 tidval = req->tids[req->tididx];
1238 }
1239 omfactor = EXP_TID_GET(tidval, LEN) * PAGE_SIZE >=
1240 KDETH_OM_MAX_SIZE ? KDETH_OM_LARGE_SHIFT :
1241 KDETH_OM_SMALL_SHIFT;
1242 /* Set KDETH.TIDCtrl based on value for this TID. */
1243 KDETH_SET(hdr->kdeth.ver_tid_offset, TIDCTRL,
1244 EXP_TID_GET(tidval, CTRL));
1245 /* Set KDETH.TID based on value for this TID */
1246 KDETH_SET(hdr->kdeth.ver_tid_offset, TID,
1247 EXP_TID_GET(tidval, IDX));
1248 /* Clear KDETH.SH when DISABLE_SH flag is set */
1249 if (unlikely(tx->flags & TXREQ_FLAGS_REQ_DISABLE_SH))
1250 KDETH_SET(hdr->kdeth.ver_tid_offset, SH, 0);
1251 /*
1252 * Set the KDETH.OFFSET and KDETH.OM based on size of
1253 * transfer.
1254 */
1255 trace_hfi1_sdma_user_tid_info(
1256 pq->dd, pq->ctxt, pq->subctxt, req->info.comp_idx,
1257 req->tidoffset, req->tidoffset >> omfactor,
1258 omfactor != KDETH_OM_SMALL_SHIFT);
1259 KDETH_SET(hdr->kdeth.ver_tid_offset, OFFSET,
1260 req->tidoffset >> omfactor);
1261 KDETH_SET(hdr->kdeth.ver_tid_offset, OM,
1262 omfactor != KDETH_OM_SMALL_SHIFT);
1263 }
1264done:
1265 trace_hfi1_sdma_user_header(pq->dd, pq->ctxt, pq->subctxt,
1266 req->info.comp_idx, hdr, tidval);
1267 return sdma_txadd_kvaddr(pq->dd, &tx->txreq, hdr, sizeof(*hdr));
1268}
1269
1270static int set_txreq_header_ahg(struct user_sdma_request *req,
1271 struct user_sdma_txreq *tx, u32 datalen)
1272{
1273 u32 ahg[AHG_KDETH_ARRAY_SIZE];
1274 int idx = 0;
1275 u8 omfactor; /* KDETH.OM */
1276 struct hfi1_user_sdma_pkt_q *pq = req->pq;
1277 struct hfi1_pkt_header *hdr = &req->hdr;
1278 u16 pbclen = le16_to_cpu(hdr->pbc[0]);
1279 u32 val32, tidval = 0, lrhlen = get_lrh_len(*hdr, pad_len(datalen));
1280 size_t array_size = ARRAY_SIZE(ahg);
1281
1282 if (PBC2LRH(pbclen) != lrhlen) {
1283 /* PBC.PbcLengthDWs */
1284 idx = ahg_header_set(ahg, idx, array_size, 0, 0, 12,
1285 (__force u16)cpu_to_le16(LRH2PBC(lrhlen)));
1286 if (idx < 0)
1287 return idx;
1288 /* LRH.PktLen (we need the full 16 bits due to byte swap) */
1289 idx = ahg_header_set(ahg, idx, array_size, 3, 0, 16,
1290 (__force u16)cpu_to_be16(lrhlen >> 2));
1291 if (idx < 0)
1292 return idx;
1293 }
1294
1295 /*
1296 * Do the common updates
1297 */
1298 /* BTH.PSN and BTH.A */
1299 val32 = (be32_to_cpu(hdr->bth[2]) + req->seqnum) &
1300 (HFI1_CAP_IS_KSET(EXTENDED_PSN) ? 0x7fffffff : 0xffffff);
1301 if (unlikely(tx->flags & TXREQ_FLAGS_REQ_ACK))
1302 val32 |= 1UL << 31;
1303 idx = ahg_header_set(ahg, idx, array_size, 6, 0, 16,
1304 (__force u16)cpu_to_be16(val32 >> 16));
1305 if (idx < 0)
1306 return idx;
1307 idx = ahg_header_set(ahg, idx, array_size, 6, 16, 16,
1308 (__force u16)cpu_to_be16(val32 & 0xffff));
1309 if (idx < 0)
1310 return idx;
1311 /* KDETH.Offset */
1312 idx = ahg_header_set(ahg, idx, array_size, 15, 0, 16,
1313 (__force u16)cpu_to_le16(req->koffset & 0xffff));
1314 if (idx < 0)
1315 return idx;
1316 idx = ahg_header_set(ahg, idx, array_size, 15, 16, 16,
1317 (__force u16)cpu_to_le16(req->koffset >> 16));
1318 if (idx < 0)
1319 return idx;
1320 if (req_opcode(req->info.ctrl) == EXPECTED) {
1321 __le16 val;
1322
1323 tidval = req->tids[req->tididx];
1324
1325 /*
1326 * If the offset puts us at the end of the current TID,
1327 * advance everything.
1328 */
1329 if ((req->tidoffset) == (EXP_TID_GET(tidval, LEN) *
1330 PAGE_SIZE)) {
1331 req->tidoffset = 0;
1332 /*
1333 * Since we don't copy all the TIDs, all at once,
1334 * we have to check again.
1335 */
1336 if (++req->tididx > req->n_tids - 1 ||
1337 !req->tids[req->tididx])
1338 return -EINVAL;
1339 tidval = req->tids[req->tididx];
1340 }
1341 omfactor = ((EXP_TID_GET(tidval, LEN) *
1342 PAGE_SIZE) >=
1343 KDETH_OM_MAX_SIZE) ? KDETH_OM_LARGE_SHIFT :
1344 KDETH_OM_SMALL_SHIFT;
1345 /* KDETH.OM and KDETH.OFFSET (TID) */
1346 idx = ahg_header_set(
1347 ahg, idx, array_size, 7, 0, 16,
1348 ((!!(omfactor - KDETH_OM_SMALL_SHIFT)) << 15 |
1349 ((req->tidoffset >> omfactor)
1350 & 0x7fff)));
1351 if (idx < 0)
1352 return idx;
1353 /* KDETH.TIDCtrl, KDETH.TID, KDETH.Intr, KDETH.SH */
1354 val = cpu_to_le16(((EXP_TID_GET(tidval, CTRL) & 0x3) << 10) |
1355 (EXP_TID_GET(tidval, IDX) & 0x3ff));
1356
1357 if (unlikely(tx->flags & TXREQ_FLAGS_REQ_DISABLE_SH)) {
1358 val |= cpu_to_le16((KDETH_GET(hdr->kdeth.ver_tid_offset,
1359 INTR) <<
1360 AHG_KDETH_INTR_SHIFT));
1361 } else {
1362 val |= KDETH_GET(hdr->kdeth.ver_tid_offset, SH) ?
1363 cpu_to_le16(0x1 << AHG_KDETH_SH_SHIFT) :
1364 cpu_to_le16((KDETH_GET(hdr->kdeth.ver_tid_offset,
1365 INTR) <<
1366 AHG_KDETH_INTR_SHIFT));
1367 }
1368
1369 idx = ahg_header_set(ahg, idx, array_size,
1370 7, 16, 14, (__force u16)val);
1371 if (idx < 0)
1372 return idx;
1373 }
1374
1375 trace_hfi1_sdma_user_header_ahg(pq->dd, pq->ctxt, pq->subctxt,
1376 req->info.comp_idx, req->sde->this_idx,
1377 req->ahg_idx, ahg, idx, tidval);
1378 sdma_txinit_ahg(&tx->txreq,
1379 SDMA_TXREQ_F_USE_AHG,
1380 datalen, req->ahg_idx, idx,
1381 ahg, sizeof(req->hdr),
1382 user_sdma_txreq_cb);
1383
1384 return idx;
1385}
1386
1387/**
1388 * user_sdma_txreq_cb() - SDMA tx request completion callback.
1389 * @txreq: valid sdma tx request
1390 * @status: success/failure of request
1391 *
1392 * Called when the SDMA progress state machine gets notification that
1393 * the SDMA descriptors for this tx request have been processed by the
1394 * DMA engine. Called in interrupt context.
1395 * Only do work on completed sequences.
1396 */
1397static void user_sdma_txreq_cb(struct sdma_txreq *txreq, int status)
1398{
1399 struct user_sdma_txreq *tx =
1400 container_of(txreq, struct user_sdma_txreq, txreq);
1401 struct user_sdma_request *req;
1402 struct hfi1_user_sdma_pkt_q *pq;
1403 struct hfi1_user_sdma_comp_q *cq;
1404 enum hfi1_sdma_comp_state state = COMPLETE;
1405
1406 if (!tx->req)
1407 return;
1408
1409 req = tx->req;
1410 pq = req->pq;
1411 cq = req->cq;
1412
1413 if (status != SDMA_TXREQ_S_OK) {
1414 SDMA_DBG(req, "SDMA completion with error %d",
1415 status);
1416 WRITE_ONCE(req->has_error, 1);
1417 state = ERROR;
1418 }
1419
1420 req->seqcomp = tx->seqnum;
1421 kmem_cache_free(pq->txreq_cache, tx);
1422
1423 /* sequence isn't complete? We are done */
1424 if (req->seqcomp != req->info.npkts - 1)
1425 return;
1426
1427 user_sdma_free_request(req, false);
1428 set_comp_state(pq, cq, req->info.comp_idx, state, status);
1429 pq_update(pq);
1430}
1431
1432static inline void pq_update(struct hfi1_user_sdma_pkt_q *pq)
1433{
1434 if (atomic_dec_and_test(&pq->n_reqs))
1435 wake_up(&pq->wait);
1436}
1437
1438static void user_sdma_free_request(struct user_sdma_request *req, bool unpin)
1439{
1440 int i;
1441
1442 if (!list_empty(&req->txps)) {
1443 struct sdma_txreq *t, *p;
1444
1445 list_for_each_entry_safe(t, p, &req->txps, list) {
1446 struct user_sdma_txreq *tx =
1447 container_of(t, struct user_sdma_txreq, txreq);
1448 list_del_init(&t->list);
1449 sdma_txclean(req->pq->dd, t);
1450 kmem_cache_free(req->pq->txreq_cache, tx);
1451 }
1452 }
1453
1454 for (i = 0; i < req->data_iovs; i++) {
1455 struct sdma_mmu_node *node = req->iovs[i].node;
1456
1457 if (!node)
1458 continue;
1459
1460 req->iovs[i].node = NULL;
1461
1462 if (unpin)
1463 hfi1_mmu_rb_remove(req->pq->handler,
1464 &node->rb);
1465 else
1466 atomic_dec(&node->refcount);
1467 }
1468
1469 kfree(req->tids);
1470 clear_bit(req->info.comp_idx, req->pq->req_in_use);
1471}
1472
1473static inline void set_comp_state(struct hfi1_user_sdma_pkt_q *pq,
1474 struct hfi1_user_sdma_comp_q *cq,
1475 u16 idx, enum hfi1_sdma_comp_state state,
1476 int ret)
1477{
1478 if (state == ERROR)
1479 cq->comps[idx].errcode = -ret;
1480 smp_wmb(); /* make sure errcode is visible first */
1481 cq->comps[idx].status = state;
1482 trace_hfi1_sdma_user_completion(pq->dd, pq->ctxt, pq->subctxt,
1483 idx, state, ret);
1484}
1485
1486static bool sdma_rb_filter(struct mmu_rb_node *node, unsigned long addr,
1487 unsigned long len)
1488{
1489 return (bool)(node->addr == addr);
1490}
1491
1492static int sdma_rb_insert(void *arg, struct mmu_rb_node *mnode)
1493{
1494 struct sdma_mmu_node *node =
1495 container_of(mnode, struct sdma_mmu_node, rb);
1496
1497 atomic_inc(&node->refcount);
1498 return 0;
1499}
1500
1501/*
1502 * Return 1 to remove the node from the rb tree and call the remove op.
1503 *
1504 * Called with the rb tree lock held.
1505 */
1506static int sdma_rb_evict(void *arg, struct mmu_rb_node *mnode,
1507 void *evict_arg, bool *stop)
1508{
1509 struct sdma_mmu_node *node =
1510 container_of(mnode, struct sdma_mmu_node, rb);
1511 struct evict_data *evict_data = evict_arg;
1512
1513 /* is this node still being used? */
1514 if (atomic_read(&node->refcount))
1515 return 0; /* keep this node */
1516
1517 /* this node will be evicted, add its pages to our count */
1518 evict_data->cleared += node->npages;
1519
1520 /* have enough pages been cleared? */
1521 if (evict_data->cleared >= evict_data->target)
1522 *stop = true;
1523
1524 return 1; /* remove this node */
1525}
1526
1527static void sdma_rb_remove(void *arg, struct mmu_rb_node *mnode)
1528{
1529 struct sdma_mmu_node *node =
1530 container_of(mnode, struct sdma_mmu_node, rb);
1531
1532 unpin_sdma_pages(node);
1533 kfree(node);
1534}
1535
1536static int sdma_rb_invalidate(void *arg, struct mmu_rb_node *mnode)
1537{
1538 struct sdma_mmu_node *node =
1539 container_of(mnode, struct sdma_mmu_node, rb);
1540
1541 if (!atomic_read(&node->refcount))
1542 return 1;
1543 return 0;
1544}