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1// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
2/*
3 * Copyright(c) 2015-2020 Intel Corporation.
4 * Copyright(c) 2021 Cornelis Networks.
5 */
6
7#include <linux/spinlock.h>
8#include <linux/pci.h>
9#include <linux/io.h>
10#include <linux/delay.h>
11#include <linux/netdevice.h>
12#include <linux/vmalloc.h>
13#include <linux/module.h>
14#include <linux/prefetch.h>
15#include <rdma/ib_verbs.h>
16#include <linux/etherdevice.h>
17
18#include "hfi.h"
19#include "trace.h"
20#include "qp.h"
21#include "sdma.h"
22#include "debugfs.h"
23#include "vnic.h"
24#include "fault.h"
25
26#include "ipoib.h"
27#include "netdev.h"
28
29#undef pr_fmt
30#define pr_fmt(fmt) DRIVER_NAME ": " fmt
31
32DEFINE_MUTEX(hfi1_mutex); /* general driver use */
33
34unsigned int hfi1_max_mtu = HFI1_DEFAULT_MAX_MTU;
35module_param_named(max_mtu, hfi1_max_mtu, uint, S_IRUGO);
36MODULE_PARM_DESC(max_mtu, "Set max MTU bytes, default is " __stringify(
37 HFI1_DEFAULT_MAX_MTU));
38
39unsigned int hfi1_cu = 1;
40module_param_named(cu, hfi1_cu, uint, S_IRUGO);
41MODULE_PARM_DESC(cu, "Credit return units");
42
43unsigned long hfi1_cap_mask = HFI1_CAP_MASK_DEFAULT;
44static int hfi1_caps_set(const char *val, const struct kernel_param *kp);
45static int hfi1_caps_get(char *buffer, const struct kernel_param *kp);
46static const struct kernel_param_ops cap_ops = {
47 .set = hfi1_caps_set,
48 .get = hfi1_caps_get
49};
50module_param_cb(cap_mask, &cap_ops, &hfi1_cap_mask, S_IWUSR | S_IRUGO);
51MODULE_PARM_DESC(cap_mask, "Bit mask of enabled/disabled HW features");
52
53MODULE_LICENSE("Dual BSD/GPL");
54MODULE_DESCRIPTION("Cornelis Omni-Path Express driver");
55
56/*
57 * MAX_PKT_RCV is the max # if packets processed per receive interrupt.
58 */
59#define MAX_PKT_RECV 64
60/*
61 * MAX_PKT_THREAD_RCV is the max # of packets processed before
62 * the qp_wait_list queue is flushed.
63 */
64#define MAX_PKT_RECV_THREAD (MAX_PKT_RECV * 4)
65#define EGR_HEAD_UPDATE_THRESHOLD 16
66
67struct hfi1_ib_stats hfi1_stats;
68
69static int hfi1_caps_set(const char *val, const struct kernel_param *kp)
70{
71 int ret = 0;
72 unsigned long *cap_mask_ptr = (unsigned long *)kp->arg,
73 cap_mask = *cap_mask_ptr, value, diff,
74 write_mask = ((HFI1_CAP_WRITABLE_MASK << HFI1_CAP_USER_SHIFT) |
75 HFI1_CAP_WRITABLE_MASK);
76
77 ret = kstrtoul(val, 0, &value);
78 if (ret) {
79 pr_warn("Invalid module parameter value for 'cap_mask'\n");
80 goto done;
81 }
82 /* Get the changed bits (except the locked bit) */
83 diff = value ^ (cap_mask & ~HFI1_CAP_LOCKED_SMASK);
84
85 /* Remove any bits that are not allowed to change after driver load */
86 if (HFI1_CAP_LOCKED() && (diff & ~write_mask)) {
87 pr_warn("Ignoring non-writable capability bits %#lx\n",
88 diff & ~write_mask);
89 diff &= write_mask;
90 }
91
92 /* Mask off any reserved bits */
93 diff &= ~HFI1_CAP_RESERVED_MASK;
94 /* Clear any previously set and changing bits */
95 cap_mask &= ~diff;
96 /* Update the bits with the new capability */
97 cap_mask |= (value & diff);
98 /* Check for any kernel/user restrictions */
99 diff = (cap_mask & (HFI1_CAP_MUST_HAVE_KERN << HFI1_CAP_USER_SHIFT)) ^
100 ((cap_mask & HFI1_CAP_MUST_HAVE_KERN) << HFI1_CAP_USER_SHIFT);
101 cap_mask &= ~diff;
102 /* Set the bitmask to the final set */
103 *cap_mask_ptr = cap_mask;
104done:
105 return ret;
106}
107
108static int hfi1_caps_get(char *buffer, const struct kernel_param *kp)
109{
110 unsigned long cap_mask = *(unsigned long *)kp->arg;
111
112 cap_mask &= ~HFI1_CAP_LOCKED_SMASK;
113 cap_mask |= ((cap_mask & HFI1_CAP_K2U) << HFI1_CAP_USER_SHIFT);
114
115 return sysfs_emit(buffer, "0x%lx\n", cap_mask);
116}
117
118struct pci_dev *get_pci_dev(struct rvt_dev_info *rdi)
119{
120 struct hfi1_ibdev *ibdev = container_of(rdi, struct hfi1_ibdev, rdi);
121 struct hfi1_devdata *dd = container_of(ibdev,
122 struct hfi1_devdata, verbs_dev);
123 return dd->pcidev;
124}
125
126/*
127 * Return count of units with at least one port ACTIVE.
128 */
129int hfi1_count_active_units(void)
130{
131 struct hfi1_devdata *dd;
132 struct hfi1_pportdata *ppd;
133 unsigned long index, flags;
134 int pidx, nunits_active = 0;
135
136 xa_lock_irqsave(&hfi1_dev_table, flags);
137 xa_for_each(&hfi1_dev_table, index, dd) {
138 if (!(dd->flags & HFI1_PRESENT) || !dd->kregbase1)
139 continue;
140 for (pidx = 0; pidx < dd->num_pports; ++pidx) {
141 ppd = dd->pport + pidx;
142 if (ppd->lid && ppd->linkup) {
143 nunits_active++;
144 break;
145 }
146 }
147 }
148 xa_unlock_irqrestore(&hfi1_dev_table, flags);
149 return nunits_active;
150}
151
152/*
153 * Get address of eager buffer from it's index (allocated in chunks, not
154 * contiguous).
155 */
156static inline void *get_egrbuf(const struct hfi1_ctxtdata *rcd, u64 rhf,
157 u8 *update)
158{
159 u32 idx = rhf_egr_index(rhf), offset = rhf_egr_buf_offset(rhf);
160
161 *update |= !(idx & (rcd->egrbufs.threshold - 1)) && !offset;
162 return (void *)(((u64)(rcd->egrbufs.rcvtids[idx].addr)) +
163 (offset * RCV_BUF_BLOCK_SIZE));
164}
165
166static inline void *hfi1_get_header(struct hfi1_ctxtdata *rcd,
167 __le32 *rhf_addr)
168{
169 u32 offset = rhf_hdrq_offset(rhf_to_cpu(rhf_addr));
170
171 return (void *)(rhf_addr - rcd->rhf_offset + offset);
172}
173
174static inline struct ib_header *hfi1_get_msgheader(struct hfi1_ctxtdata *rcd,
175 __le32 *rhf_addr)
176{
177 return (struct ib_header *)hfi1_get_header(rcd, rhf_addr);
178}
179
180static inline struct hfi1_16b_header
181 *hfi1_get_16B_header(struct hfi1_ctxtdata *rcd,
182 __le32 *rhf_addr)
183{
184 return (struct hfi1_16b_header *)hfi1_get_header(rcd, rhf_addr);
185}
186
187/*
188 * Validate and encode the a given RcvArray Buffer size.
189 * The function will check whether the given size falls within
190 * allowed size ranges for the respective type and, optionally,
191 * return the proper encoding.
192 */
193int hfi1_rcvbuf_validate(u32 size, u8 type, u16 *encoded)
194{
195 if (unlikely(!PAGE_ALIGNED(size)))
196 return 0;
197 if (unlikely(size < MIN_EAGER_BUFFER))
198 return 0;
199 if (size >
200 (type == PT_EAGER ? MAX_EAGER_BUFFER : MAX_EXPECTED_BUFFER))
201 return 0;
202 if (encoded)
203 *encoded = ilog2(size / PAGE_SIZE) + 1;
204 return 1;
205}
206
207static void rcv_hdrerr(struct hfi1_ctxtdata *rcd, struct hfi1_pportdata *ppd,
208 struct hfi1_packet *packet)
209{
210 struct ib_header *rhdr = packet->hdr;
211 u32 rte = rhf_rcv_type_err(packet->rhf);
212 u32 mlid_base;
213 struct hfi1_ibport *ibp = rcd_to_iport(rcd);
214 struct hfi1_devdata *dd = ppd->dd;
215 struct hfi1_ibdev *verbs_dev = &dd->verbs_dev;
216 struct rvt_dev_info *rdi = &verbs_dev->rdi;
217
218 if ((packet->rhf & RHF_DC_ERR) &&
219 hfi1_dbg_fault_suppress_err(verbs_dev))
220 return;
221
222 if (packet->rhf & RHF_ICRC_ERR)
223 return;
224
225 if (packet->etype == RHF_RCV_TYPE_BYPASS) {
226 goto drop;
227 } else {
228 u8 lnh = ib_get_lnh(rhdr);
229
230 mlid_base = be16_to_cpu(IB_MULTICAST_LID_BASE);
231 if (lnh == HFI1_LRH_BTH) {
232 packet->ohdr = &rhdr->u.oth;
233 } else if (lnh == HFI1_LRH_GRH) {
234 packet->ohdr = &rhdr->u.l.oth;
235 packet->grh = &rhdr->u.l.grh;
236 } else {
237 goto drop;
238 }
239 }
240
241 if (packet->rhf & RHF_TID_ERR) {
242 /* For TIDERR and RC QPs preemptively schedule a NAK */
243 u32 tlen = rhf_pkt_len(packet->rhf); /* in bytes */
244 u32 dlid = ib_get_dlid(rhdr);
245 u32 qp_num;
246
247 /* Sanity check packet */
248 if (tlen < 24)
249 goto drop;
250
251 /* Check for GRH */
252 if (packet->grh) {
253 u32 vtf;
254 struct ib_grh *grh = packet->grh;
255
256 if (grh->next_hdr != IB_GRH_NEXT_HDR)
257 goto drop;
258 vtf = be32_to_cpu(grh->version_tclass_flow);
259 if ((vtf >> IB_GRH_VERSION_SHIFT) != IB_GRH_VERSION)
260 goto drop;
261 }
262
263 /* Get the destination QP number. */
264 qp_num = ib_bth_get_qpn(packet->ohdr);
265 if (dlid < mlid_base) {
266 struct rvt_qp *qp;
267 unsigned long flags;
268
269 rcu_read_lock();
270 qp = rvt_lookup_qpn(rdi, &ibp->rvp, qp_num);
271 if (!qp) {
272 rcu_read_unlock();
273 goto drop;
274 }
275
276 /*
277 * Handle only RC QPs - for other QP types drop error
278 * packet.
279 */
280 spin_lock_irqsave(&qp->r_lock, flags);
281
282 /* Check for valid receive state. */
283 if (!(ib_rvt_state_ops[qp->state] &
284 RVT_PROCESS_RECV_OK)) {
285 ibp->rvp.n_pkt_drops++;
286 }
287
288 switch (qp->ibqp.qp_type) {
289 case IB_QPT_RC:
290 hfi1_rc_hdrerr(rcd, packet, qp);
291 break;
292 default:
293 /* For now don't handle any other QP types */
294 break;
295 }
296
297 spin_unlock_irqrestore(&qp->r_lock, flags);
298 rcu_read_unlock();
299 } /* Unicast QP */
300 } /* Valid packet with TIDErr */
301
302 /* handle "RcvTypeErr" flags */
303 switch (rte) {
304 case RHF_RTE_ERROR_OP_CODE_ERR:
305 {
306 void *ebuf = NULL;
307 u8 opcode;
308
309 if (rhf_use_egr_bfr(packet->rhf))
310 ebuf = packet->ebuf;
311
312 if (!ebuf)
313 goto drop; /* this should never happen */
314
315 opcode = ib_bth_get_opcode(packet->ohdr);
316 if (opcode == IB_OPCODE_CNP) {
317 /*
318 * Only in pre-B0 h/w is the CNP_OPCODE handled
319 * via this code path.
320 */
321 struct rvt_qp *qp = NULL;
322 u32 lqpn, rqpn;
323 u16 rlid;
324 u8 svc_type, sl, sc5;
325
326 sc5 = hfi1_9B_get_sc5(rhdr, packet->rhf);
327 sl = ibp->sc_to_sl[sc5];
328
329 lqpn = ib_bth_get_qpn(packet->ohdr);
330 rcu_read_lock();
331 qp = rvt_lookup_qpn(rdi, &ibp->rvp, lqpn);
332 if (!qp) {
333 rcu_read_unlock();
334 goto drop;
335 }
336
337 switch (qp->ibqp.qp_type) {
338 case IB_QPT_UD:
339 rlid = 0;
340 rqpn = 0;
341 svc_type = IB_CC_SVCTYPE_UD;
342 break;
343 case IB_QPT_UC:
344 rlid = ib_get_slid(rhdr);
345 rqpn = qp->remote_qpn;
346 svc_type = IB_CC_SVCTYPE_UC;
347 break;
348 default:
349 rcu_read_unlock();
350 goto drop;
351 }
352
353 process_becn(ppd, sl, rlid, lqpn, rqpn, svc_type);
354 rcu_read_unlock();
355 }
356
357 packet->rhf &= ~RHF_RCV_TYPE_ERR_SMASK;
358 break;
359 }
360 default:
361 break;
362 }
363
364drop:
365 return;
366}
367
368static inline void init_packet(struct hfi1_ctxtdata *rcd,
369 struct hfi1_packet *packet)
370{
371 packet->rsize = get_hdrqentsize(rcd); /* words */
372 packet->maxcnt = get_hdrq_cnt(rcd) * packet->rsize; /* words */
373 packet->rcd = rcd;
374 packet->updegr = 0;
375 packet->etail = -1;
376 packet->rhf_addr = get_rhf_addr(rcd);
377 packet->rhf = rhf_to_cpu(packet->rhf_addr);
378 packet->rhqoff = hfi1_rcd_head(rcd);
379 packet->numpkt = 0;
380}
381
382/* We support only two types - 9B and 16B for now */
383static const hfi1_handle_cnp hfi1_handle_cnp_tbl[2] = {
384 [HFI1_PKT_TYPE_9B] = &return_cnp,
385 [HFI1_PKT_TYPE_16B] = &return_cnp_16B
386};
387
388/**
389 * hfi1_process_ecn_slowpath - Process FECN or BECN bits
390 * @qp: The packet's destination QP
391 * @pkt: The packet itself.
392 * @prescan: Is the caller the RXQ prescan
393 *
394 * Process the packet's FECN or BECN bits. By now, the packet
395 * has already been evaluated whether processing of those bit should
396 * be done.
397 * The significance of the @prescan argument is that if the caller
398 * is the RXQ prescan, a CNP will be send out instead of waiting for the
399 * normal packet processing to send an ACK with BECN set (or a CNP).
400 */
401bool hfi1_process_ecn_slowpath(struct rvt_qp *qp, struct hfi1_packet *pkt,
402 bool prescan)
403{
404 struct hfi1_ibport *ibp = to_iport(qp->ibqp.device, qp->port_num);
405 struct hfi1_pportdata *ppd = ppd_from_ibp(ibp);
406 struct ib_other_headers *ohdr = pkt->ohdr;
407 struct ib_grh *grh = pkt->grh;
408 u32 rqpn = 0;
409 u16 pkey;
410 u32 rlid, slid, dlid = 0;
411 u8 hdr_type, sc, svc_type, opcode;
412 bool is_mcast = false, ignore_fecn = false, do_cnp = false,
413 fecn, becn;
414
415 /* can be called from prescan */
416 if (pkt->etype == RHF_RCV_TYPE_BYPASS) {
417 pkey = hfi1_16B_get_pkey(pkt->hdr);
418 sc = hfi1_16B_get_sc(pkt->hdr);
419 dlid = hfi1_16B_get_dlid(pkt->hdr);
420 slid = hfi1_16B_get_slid(pkt->hdr);
421 is_mcast = hfi1_is_16B_mcast(dlid);
422 opcode = ib_bth_get_opcode(ohdr);
423 hdr_type = HFI1_PKT_TYPE_16B;
424 fecn = hfi1_16B_get_fecn(pkt->hdr);
425 becn = hfi1_16B_get_becn(pkt->hdr);
426 } else {
427 pkey = ib_bth_get_pkey(ohdr);
428 sc = hfi1_9B_get_sc5(pkt->hdr, pkt->rhf);
429 dlid = qp->ibqp.qp_type != IB_QPT_UD ? ib_get_dlid(pkt->hdr) :
430 ppd->lid;
431 slid = ib_get_slid(pkt->hdr);
432 is_mcast = (dlid > be16_to_cpu(IB_MULTICAST_LID_BASE)) &&
433 (dlid != be16_to_cpu(IB_LID_PERMISSIVE));
434 opcode = ib_bth_get_opcode(ohdr);
435 hdr_type = HFI1_PKT_TYPE_9B;
436 fecn = ib_bth_get_fecn(ohdr);
437 becn = ib_bth_get_becn(ohdr);
438 }
439
440 switch (qp->ibqp.qp_type) {
441 case IB_QPT_UD:
442 rlid = slid;
443 rqpn = ib_get_sqpn(pkt->ohdr);
444 svc_type = IB_CC_SVCTYPE_UD;
445 break;
446 case IB_QPT_SMI:
447 case IB_QPT_GSI:
448 rlid = slid;
449 rqpn = ib_get_sqpn(pkt->ohdr);
450 svc_type = IB_CC_SVCTYPE_UD;
451 break;
452 case IB_QPT_UC:
453 rlid = rdma_ah_get_dlid(&qp->remote_ah_attr);
454 rqpn = qp->remote_qpn;
455 svc_type = IB_CC_SVCTYPE_UC;
456 break;
457 case IB_QPT_RC:
458 rlid = rdma_ah_get_dlid(&qp->remote_ah_attr);
459 rqpn = qp->remote_qpn;
460 svc_type = IB_CC_SVCTYPE_RC;
461 break;
462 default:
463 return false;
464 }
465
466 ignore_fecn = is_mcast || (opcode == IB_OPCODE_CNP) ||
467 (opcode == IB_OPCODE_RC_ACKNOWLEDGE);
468 /*
469 * ACKNOWLEDGE packets do not get a CNP but this will be
470 * guarded by ignore_fecn above.
471 */
472 do_cnp = prescan ||
473 (opcode >= IB_OPCODE_RC_RDMA_READ_RESPONSE_FIRST &&
474 opcode <= IB_OPCODE_RC_ATOMIC_ACKNOWLEDGE) ||
475 opcode == TID_OP(READ_RESP) ||
476 opcode == TID_OP(ACK);
477
478 /* Call appropriate CNP handler */
479 if (!ignore_fecn && do_cnp && fecn)
480 hfi1_handle_cnp_tbl[hdr_type](ibp, qp, rqpn, pkey,
481 dlid, rlid, sc, grh);
482
483 if (becn) {
484 u32 lqpn = be32_to_cpu(ohdr->bth[1]) & RVT_QPN_MASK;
485 u8 sl = ibp->sc_to_sl[sc];
486
487 process_becn(ppd, sl, rlid, lqpn, rqpn, svc_type);
488 }
489 return !ignore_fecn && fecn;
490}
491
492struct ps_mdata {
493 struct hfi1_ctxtdata *rcd;
494 u32 rsize;
495 u32 maxcnt;
496 u32 ps_head;
497 u32 ps_tail;
498 u32 ps_seq;
499};
500
501static inline void init_ps_mdata(struct ps_mdata *mdata,
502 struct hfi1_packet *packet)
503{
504 struct hfi1_ctxtdata *rcd = packet->rcd;
505
506 mdata->rcd = rcd;
507 mdata->rsize = packet->rsize;
508 mdata->maxcnt = packet->maxcnt;
509 mdata->ps_head = packet->rhqoff;
510
511 if (get_dma_rtail_setting(rcd)) {
512 mdata->ps_tail = get_rcvhdrtail(rcd);
513 if (rcd->ctxt == HFI1_CTRL_CTXT)
514 mdata->ps_seq = hfi1_seq_cnt(rcd);
515 else
516 mdata->ps_seq = 0; /* not used with DMA_RTAIL */
517 } else {
518 mdata->ps_tail = 0; /* used only with DMA_RTAIL*/
519 mdata->ps_seq = hfi1_seq_cnt(rcd);
520 }
521}
522
523static inline int ps_done(struct ps_mdata *mdata, u64 rhf,
524 struct hfi1_ctxtdata *rcd)
525{
526 if (get_dma_rtail_setting(rcd))
527 return mdata->ps_head == mdata->ps_tail;
528 return mdata->ps_seq != rhf_rcv_seq(rhf);
529}
530
531static inline int ps_skip(struct ps_mdata *mdata, u64 rhf,
532 struct hfi1_ctxtdata *rcd)
533{
534 /*
535 * Control context can potentially receive an invalid rhf.
536 * Drop such packets.
537 */
538 if ((rcd->ctxt == HFI1_CTRL_CTXT) && (mdata->ps_head != mdata->ps_tail))
539 return mdata->ps_seq != rhf_rcv_seq(rhf);
540
541 return 0;
542}
543
544static inline void update_ps_mdata(struct ps_mdata *mdata,
545 struct hfi1_ctxtdata *rcd)
546{
547 mdata->ps_head += mdata->rsize;
548 if (mdata->ps_head >= mdata->maxcnt)
549 mdata->ps_head = 0;
550
551 /* Control context must do seq counting */
552 if (!get_dma_rtail_setting(rcd) ||
553 rcd->ctxt == HFI1_CTRL_CTXT)
554 mdata->ps_seq = hfi1_seq_incr_wrap(mdata->ps_seq);
555}
556
557/*
558 * prescan_rxq - search through the receive queue looking for packets
559 * containing Excplicit Congestion Notifications (FECNs, or BECNs).
560 * When an ECN is found, process the Congestion Notification, and toggle
561 * it off.
562 * This is declared as a macro to allow quick checking of the port to avoid
563 * the overhead of a function call if not enabled.
564 */
565#define prescan_rxq(rcd, packet) \
566 do { \
567 if (rcd->ppd->cc_prescan) \
568 __prescan_rxq(packet); \
569 } while (0)
570static void __prescan_rxq(struct hfi1_packet *packet)
571{
572 struct hfi1_ctxtdata *rcd = packet->rcd;
573 struct ps_mdata mdata;
574
575 init_ps_mdata(&mdata, packet);
576
577 while (1) {
578 struct hfi1_ibport *ibp = rcd_to_iport(rcd);
579 __le32 *rhf_addr = (__le32 *)rcd->rcvhdrq + mdata.ps_head +
580 packet->rcd->rhf_offset;
581 struct rvt_qp *qp;
582 struct ib_header *hdr;
583 struct rvt_dev_info *rdi = &rcd->dd->verbs_dev.rdi;
584 u64 rhf = rhf_to_cpu(rhf_addr);
585 u32 etype = rhf_rcv_type(rhf), qpn, bth1;
586 u8 lnh;
587
588 if (ps_done(&mdata, rhf, rcd))
589 break;
590
591 if (ps_skip(&mdata, rhf, rcd))
592 goto next;
593
594 if (etype != RHF_RCV_TYPE_IB)
595 goto next;
596
597 packet->hdr = hfi1_get_msgheader(packet->rcd, rhf_addr);
598 hdr = packet->hdr;
599 lnh = ib_get_lnh(hdr);
600
601 if (lnh == HFI1_LRH_BTH) {
602 packet->ohdr = &hdr->u.oth;
603 packet->grh = NULL;
604 } else if (lnh == HFI1_LRH_GRH) {
605 packet->ohdr = &hdr->u.l.oth;
606 packet->grh = &hdr->u.l.grh;
607 } else {
608 goto next; /* just in case */
609 }
610
611 if (!hfi1_may_ecn(packet))
612 goto next;
613
614 bth1 = be32_to_cpu(packet->ohdr->bth[1]);
615 qpn = bth1 & RVT_QPN_MASK;
616 rcu_read_lock();
617 qp = rvt_lookup_qpn(rdi, &ibp->rvp, qpn);
618
619 if (!qp) {
620 rcu_read_unlock();
621 goto next;
622 }
623
624 hfi1_process_ecn_slowpath(qp, packet, true);
625 rcu_read_unlock();
626
627 /* turn off BECN, FECN */
628 bth1 &= ~(IB_FECN_SMASK | IB_BECN_SMASK);
629 packet->ohdr->bth[1] = cpu_to_be32(bth1);
630next:
631 update_ps_mdata(&mdata, rcd);
632 }
633}
634
635static void process_rcv_qp_work(struct hfi1_packet *packet)
636{
637 struct rvt_qp *qp, *nqp;
638 struct hfi1_ctxtdata *rcd = packet->rcd;
639
640 /*
641 * Iterate over all QPs waiting to respond.
642 * The list won't change since the IRQ is only run on one CPU.
643 */
644 list_for_each_entry_safe(qp, nqp, &rcd->qp_wait_list, rspwait) {
645 list_del_init(&qp->rspwait);
646 if (qp->r_flags & RVT_R_RSP_NAK) {
647 qp->r_flags &= ~RVT_R_RSP_NAK;
648 packet->qp = qp;
649 hfi1_send_rc_ack(packet, 0);
650 }
651 if (qp->r_flags & RVT_R_RSP_SEND) {
652 unsigned long flags;
653
654 qp->r_flags &= ~RVT_R_RSP_SEND;
655 spin_lock_irqsave(&qp->s_lock, flags);
656 if (ib_rvt_state_ops[qp->state] &
657 RVT_PROCESS_OR_FLUSH_SEND)
658 hfi1_schedule_send(qp);
659 spin_unlock_irqrestore(&qp->s_lock, flags);
660 }
661 rvt_put_qp(qp);
662 }
663}
664
665static noinline int max_packet_exceeded(struct hfi1_packet *packet, int thread)
666{
667 if (thread) {
668 if ((packet->numpkt & (MAX_PKT_RECV_THREAD - 1)) == 0)
669 /* allow defered processing */
670 process_rcv_qp_work(packet);
671 cond_resched();
672 return RCV_PKT_OK;
673 } else {
674 this_cpu_inc(*packet->rcd->dd->rcv_limit);
675 return RCV_PKT_LIMIT;
676 }
677}
678
679static inline int check_max_packet(struct hfi1_packet *packet, int thread)
680{
681 int ret = RCV_PKT_OK;
682
683 if (unlikely((packet->numpkt & (MAX_PKT_RECV - 1)) == 0))
684 ret = max_packet_exceeded(packet, thread);
685 return ret;
686}
687
688static noinline int skip_rcv_packet(struct hfi1_packet *packet, int thread)
689{
690 int ret;
691
692 packet->rcd->dd->ctx0_seq_drop++;
693 /* Set up for the next packet */
694 packet->rhqoff += packet->rsize;
695 if (packet->rhqoff >= packet->maxcnt)
696 packet->rhqoff = 0;
697
698 packet->numpkt++;
699 ret = check_max_packet(packet, thread);
700
701 packet->rhf_addr = (__le32 *)packet->rcd->rcvhdrq + packet->rhqoff +
702 packet->rcd->rhf_offset;
703 packet->rhf = rhf_to_cpu(packet->rhf_addr);
704
705 return ret;
706}
707
708static void process_rcv_packet_napi(struct hfi1_packet *packet)
709{
710 packet->etype = rhf_rcv_type(packet->rhf);
711
712 /* total length */
713 packet->tlen = rhf_pkt_len(packet->rhf); /* in bytes */
714 /* retrieve eager buffer details */
715 packet->etail = rhf_egr_index(packet->rhf);
716 packet->ebuf = get_egrbuf(packet->rcd, packet->rhf,
717 &packet->updegr);
718 /*
719 * Prefetch the contents of the eager buffer. It is
720 * OK to send a negative length to prefetch_range().
721 * The +2 is the size of the RHF.
722 */
723 prefetch_range(packet->ebuf,
724 packet->tlen - ((packet->rcd->rcvhdrqentsize -
725 (rhf_hdrq_offset(packet->rhf)
726 + 2)) * 4));
727
728 packet->rcd->rhf_rcv_function_map[packet->etype](packet);
729 packet->numpkt++;
730
731 /* Set up for the next packet */
732 packet->rhqoff += packet->rsize;
733 if (packet->rhqoff >= packet->maxcnt)
734 packet->rhqoff = 0;
735
736 packet->rhf_addr = (__le32 *)packet->rcd->rcvhdrq + packet->rhqoff +
737 packet->rcd->rhf_offset;
738 packet->rhf = rhf_to_cpu(packet->rhf_addr);
739}
740
741static inline int process_rcv_packet(struct hfi1_packet *packet, int thread)
742{
743 int ret;
744
745 packet->etype = rhf_rcv_type(packet->rhf);
746
747 /* total length */
748 packet->tlen = rhf_pkt_len(packet->rhf); /* in bytes */
749 /* retrieve eager buffer details */
750 packet->ebuf = NULL;
751 if (rhf_use_egr_bfr(packet->rhf)) {
752 packet->etail = rhf_egr_index(packet->rhf);
753 packet->ebuf = get_egrbuf(packet->rcd, packet->rhf,
754 &packet->updegr);
755 /*
756 * Prefetch the contents of the eager buffer. It is
757 * OK to send a negative length to prefetch_range().
758 * The +2 is the size of the RHF.
759 */
760 prefetch_range(packet->ebuf,
761 packet->tlen - ((get_hdrqentsize(packet->rcd) -
762 (rhf_hdrq_offset(packet->rhf)
763 + 2)) * 4));
764 }
765
766 /*
767 * Call a type specific handler for the packet. We
768 * should be able to trust that etype won't be beyond
769 * the range of valid indexes. If so something is really
770 * wrong and we can probably just let things come
771 * crashing down. There is no need to eat another
772 * comparison in this performance critical code.
773 */
774 packet->rcd->rhf_rcv_function_map[packet->etype](packet);
775 packet->numpkt++;
776
777 /* Set up for the next packet */
778 packet->rhqoff += packet->rsize;
779 if (packet->rhqoff >= packet->maxcnt)
780 packet->rhqoff = 0;
781
782 ret = check_max_packet(packet, thread);
783
784 packet->rhf_addr = (__le32 *)packet->rcd->rcvhdrq + packet->rhqoff +
785 packet->rcd->rhf_offset;
786 packet->rhf = rhf_to_cpu(packet->rhf_addr);
787
788 return ret;
789}
790
791static inline void process_rcv_update(int last, struct hfi1_packet *packet)
792{
793 /*
794 * Update head regs etc., every 16 packets, if not last pkt,
795 * to help prevent rcvhdrq overflows, when many packets
796 * are processed and queue is nearly full.
797 * Don't request an interrupt for intermediate updates.
798 */
799 if (!last && !(packet->numpkt & 0xf)) {
800 update_usrhead(packet->rcd, packet->rhqoff, packet->updegr,
801 packet->etail, 0, 0);
802 packet->updegr = 0;
803 }
804 packet->grh = NULL;
805}
806
807static inline void finish_packet(struct hfi1_packet *packet)
808{
809 /*
810 * Nothing we need to free for the packet.
811 *
812 * The only thing we need to do is a final update and call for an
813 * interrupt
814 */
815 update_usrhead(packet->rcd, hfi1_rcd_head(packet->rcd), packet->updegr,
816 packet->etail, rcv_intr_dynamic, packet->numpkt);
817}
818
819/*
820 * handle_receive_interrupt_napi_fp - receive a packet
821 * @rcd: the context
822 * @budget: polling budget
823 *
824 * Called from interrupt handler for receive interrupt.
825 * This is the fast path interrupt handler
826 * when executing napi soft irq environment.
827 */
828int handle_receive_interrupt_napi_fp(struct hfi1_ctxtdata *rcd, int budget)
829{
830 struct hfi1_packet packet;
831
832 init_packet(rcd, &packet);
833 if (last_rcv_seq(rcd, rhf_rcv_seq(packet.rhf)))
834 goto bail;
835
836 while (packet.numpkt < budget) {
837 process_rcv_packet_napi(&packet);
838 if (hfi1_seq_incr(rcd, rhf_rcv_seq(packet.rhf)))
839 break;
840
841 process_rcv_update(0, &packet);
842 }
843 hfi1_set_rcd_head(rcd, packet.rhqoff);
844bail:
845 finish_packet(&packet);
846 return packet.numpkt;
847}
848
849/*
850 * Handle receive interrupts when using the no dma rtail option.
851 */
852int handle_receive_interrupt_nodma_rtail(struct hfi1_ctxtdata *rcd, int thread)
853{
854 int last = RCV_PKT_OK;
855 struct hfi1_packet packet;
856
857 init_packet(rcd, &packet);
858 if (last_rcv_seq(rcd, rhf_rcv_seq(packet.rhf))) {
859 last = RCV_PKT_DONE;
860 goto bail;
861 }
862
863 prescan_rxq(rcd, &packet);
864
865 while (last == RCV_PKT_OK) {
866 last = process_rcv_packet(&packet, thread);
867 if (hfi1_seq_incr(rcd, rhf_rcv_seq(packet.rhf)))
868 last = RCV_PKT_DONE;
869 process_rcv_update(last, &packet);
870 }
871 process_rcv_qp_work(&packet);
872 hfi1_set_rcd_head(rcd, packet.rhqoff);
873bail:
874 finish_packet(&packet);
875 return last;
876}
877
878int handle_receive_interrupt_dma_rtail(struct hfi1_ctxtdata *rcd, int thread)
879{
880 u32 hdrqtail;
881 int last = RCV_PKT_OK;
882 struct hfi1_packet packet;
883
884 init_packet(rcd, &packet);
885 hdrqtail = get_rcvhdrtail(rcd);
886 if (packet.rhqoff == hdrqtail) {
887 last = RCV_PKT_DONE;
888 goto bail;
889 }
890 smp_rmb(); /* prevent speculative reads of dma'ed hdrq */
891
892 prescan_rxq(rcd, &packet);
893
894 while (last == RCV_PKT_OK) {
895 last = process_rcv_packet(&packet, thread);
896 if (packet.rhqoff == hdrqtail)
897 last = RCV_PKT_DONE;
898 process_rcv_update(last, &packet);
899 }
900 process_rcv_qp_work(&packet);
901 hfi1_set_rcd_head(rcd, packet.rhqoff);
902bail:
903 finish_packet(&packet);
904 return last;
905}
906
907static void set_all_fastpath(struct hfi1_devdata *dd, struct hfi1_ctxtdata *rcd)
908{
909 u16 i;
910
911 /*
912 * For dynamically allocated kernel contexts (like vnic) switch
913 * interrupt handler only for that context. Otherwise, switch
914 * interrupt handler for all statically allocated kernel contexts.
915 */
916 if (rcd->ctxt >= dd->first_dyn_alloc_ctxt && !rcd->is_vnic) {
917 hfi1_rcd_get(rcd);
918 hfi1_set_fast(rcd);
919 hfi1_rcd_put(rcd);
920 return;
921 }
922
923 for (i = HFI1_CTRL_CTXT + 1; i < dd->num_rcv_contexts; i++) {
924 rcd = hfi1_rcd_get_by_index(dd, i);
925 if (rcd && (i < dd->first_dyn_alloc_ctxt || rcd->is_vnic))
926 hfi1_set_fast(rcd);
927 hfi1_rcd_put(rcd);
928 }
929}
930
931void set_all_slowpath(struct hfi1_devdata *dd)
932{
933 struct hfi1_ctxtdata *rcd;
934 u16 i;
935
936 /* HFI1_CTRL_CTXT must always use the slow path interrupt handler */
937 for (i = HFI1_CTRL_CTXT + 1; i < dd->num_rcv_contexts; i++) {
938 rcd = hfi1_rcd_get_by_index(dd, i);
939 if (!rcd)
940 continue;
941 if (i < dd->first_dyn_alloc_ctxt || rcd->is_vnic)
942 rcd->do_interrupt = rcd->slow_handler;
943
944 hfi1_rcd_put(rcd);
945 }
946}
947
948static bool __set_armed_to_active(struct hfi1_packet *packet)
949{
950 u8 etype = rhf_rcv_type(packet->rhf);
951 u8 sc = SC15_PACKET;
952
953 if (etype == RHF_RCV_TYPE_IB) {
954 struct ib_header *hdr = hfi1_get_msgheader(packet->rcd,
955 packet->rhf_addr);
956 sc = hfi1_9B_get_sc5(hdr, packet->rhf);
957 } else if (etype == RHF_RCV_TYPE_BYPASS) {
958 struct hfi1_16b_header *hdr = hfi1_get_16B_header(
959 packet->rcd,
960 packet->rhf_addr);
961 sc = hfi1_16B_get_sc(hdr);
962 }
963 if (sc != SC15_PACKET) {
964 int hwstate = driver_lstate(packet->rcd->ppd);
965 struct work_struct *lsaw =
966 &packet->rcd->ppd->linkstate_active_work;
967
968 if (hwstate != IB_PORT_ACTIVE) {
969 dd_dev_info(packet->rcd->dd,
970 "Unexpected link state %s\n",
971 opa_lstate_name(hwstate));
972 return false;
973 }
974
975 queue_work(packet->rcd->ppd->link_wq, lsaw);
976 return true;
977 }
978 return false;
979}
980
981/**
982 * set_armed_to_active - the fast path for armed to active
983 * @packet: the packet structure
984 *
985 * Return true if packet processing needs to bail.
986 */
987static bool set_armed_to_active(struct hfi1_packet *packet)
988{
989 if (likely(packet->rcd->ppd->host_link_state != HLS_UP_ARMED))
990 return false;
991 return __set_armed_to_active(packet);
992}
993
994/*
995 * handle_receive_interrupt - receive a packet
996 * @rcd: the context
997 *
998 * Called from interrupt handler for errors or receive interrupt.
999 * This is the slow path interrupt handler.
1000 */
1001int handle_receive_interrupt(struct hfi1_ctxtdata *rcd, int thread)
1002{
1003 struct hfi1_devdata *dd = rcd->dd;
1004 u32 hdrqtail;
1005 int needset, last = RCV_PKT_OK;
1006 struct hfi1_packet packet;
1007 int skip_pkt = 0;
1008
1009 if (!rcd->rcvhdrq)
1010 return RCV_PKT_OK;
1011 /* Control context will always use the slow path interrupt handler */
1012 needset = (rcd->ctxt == HFI1_CTRL_CTXT) ? 0 : 1;
1013
1014 init_packet(rcd, &packet);
1015
1016 if (!get_dma_rtail_setting(rcd)) {
1017 if (last_rcv_seq(rcd, rhf_rcv_seq(packet.rhf))) {
1018 last = RCV_PKT_DONE;
1019 goto bail;
1020 }
1021 hdrqtail = 0;
1022 } else {
1023 hdrqtail = get_rcvhdrtail(rcd);
1024 if (packet.rhqoff == hdrqtail) {
1025 last = RCV_PKT_DONE;
1026 goto bail;
1027 }
1028 smp_rmb(); /* prevent speculative reads of dma'ed hdrq */
1029
1030 /*
1031 * Control context can potentially receive an invalid
1032 * rhf. Drop such packets.
1033 */
1034 if (rcd->ctxt == HFI1_CTRL_CTXT)
1035 if (last_rcv_seq(rcd, rhf_rcv_seq(packet.rhf)))
1036 skip_pkt = 1;
1037 }
1038
1039 prescan_rxq(rcd, &packet);
1040
1041 while (last == RCV_PKT_OK) {
1042 if (hfi1_need_drop(dd)) {
1043 /* On to the next packet */
1044 packet.rhqoff += packet.rsize;
1045 packet.rhf_addr = (__le32 *)rcd->rcvhdrq +
1046 packet.rhqoff +
1047 rcd->rhf_offset;
1048 packet.rhf = rhf_to_cpu(packet.rhf_addr);
1049
1050 } else if (skip_pkt) {
1051 last = skip_rcv_packet(&packet, thread);
1052 skip_pkt = 0;
1053 } else {
1054 if (set_armed_to_active(&packet))
1055 goto bail;
1056 last = process_rcv_packet(&packet, thread);
1057 }
1058
1059 if (!get_dma_rtail_setting(rcd)) {
1060 if (hfi1_seq_incr(rcd, rhf_rcv_seq(packet.rhf)))
1061 last = RCV_PKT_DONE;
1062 } else {
1063 if (packet.rhqoff == hdrqtail)
1064 last = RCV_PKT_DONE;
1065 /*
1066 * Control context can potentially receive an invalid
1067 * rhf. Drop such packets.
1068 */
1069 if (rcd->ctxt == HFI1_CTRL_CTXT) {
1070 bool lseq;
1071
1072 lseq = hfi1_seq_incr(rcd,
1073 rhf_rcv_seq(packet.rhf));
1074 if (!last && lseq)
1075 skip_pkt = 1;
1076 }
1077 }
1078
1079 if (needset) {
1080 needset = false;
1081 set_all_fastpath(dd, rcd);
1082 }
1083 process_rcv_update(last, &packet);
1084 }
1085
1086 process_rcv_qp_work(&packet);
1087 hfi1_set_rcd_head(rcd, packet.rhqoff);
1088
1089bail:
1090 /*
1091 * Always write head at end, and setup rcv interrupt, even
1092 * if no packets were processed.
1093 */
1094 finish_packet(&packet);
1095 return last;
1096}
1097
1098/*
1099 * handle_receive_interrupt_napi_sp - receive a packet
1100 * @rcd: the context
1101 * @budget: polling budget
1102 *
1103 * Called from interrupt handler for errors or receive interrupt.
1104 * This is the slow path interrupt handler
1105 * when executing napi soft irq environment.
1106 */
1107int handle_receive_interrupt_napi_sp(struct hfi1_ctxtdata *rcd, int budget)
1108{
1109 struct hfi1_devdata *dd = rcd->dd;
1110 int last = RCV_PKT_OK;
1111 bool needset = true;
1112 struct hfi1_packet packet;
1113
1114 init_packet(rcd, &packet);
1115 if (last_rcv_seq(rcd, rhf_rcv_seq(packet.rhf)))
1116 goto bail;
1117
1118 while (last != RCV_PKT_DONE && packet.numpkt < budget) {
1119 if (hfi1_need_drop(dd)) {
1120 /* On to the next packet */
1121 packet.rhqoff += packet.rsize;
1122 packet.rhf_addr = (__le32 *)rcd->rcvhdrq +
1123 packet.rhqoff +
1124 rcd->rhf_offset;
1125 packet.rhf = rhf_to_cpu(packet.rhf_addr);
1126
1127 } else {
1128 if (set_armed_to_active(&packet))
1129 goto bail;
1130 process_rcv_packet_napi(&packet);
1131 }
1132
1133 if (hfi1_seq_incr(rcd, rhf_rcv_seq(packet.rhf)))
1134 last = RCV_PKT_DONE;
1135
1136 if (needset) {
1137 needset = false;
1138 set_all_fastpath(dd, rcd);
1139 }
1140
1141 process_rcv_update(last, &packet);
1142 }
1143
1144 hfi1_set_rcd_head(rcd, packet.rhqoff);
1145
1146bail:
1147 /*
1148 * Always write head at end, and setup rcv interrupt, even
1149 * if no packets were processed.
1150 */
1151 finish_packet(&packet);
1152 return packet.numpkt;
1153}
1154
1155/*
1156 * We may discover in the interrupt that the hardware link state has
1157 * changed from ARMED to ACTIVE (due to the arrival of a non-SC15 packet),
1158 * and we need to update the driver's notion of the link state. We cannot
1159 * run set_link_state from interrupt context, so we queue this function on
1160 * a workqueue.
1161 *
1162 * We delay the regular interrupt processing until after the state changes
1163 * so that the link will be in the correct state by the time any application
1164 * we wake up attempts to send a reply to any message it received.
1165 * (Subsequent receive interrupts may possibly force the wakeup before we
1166 * update the link state.)
1167 *
1168 * The rcd is freed in hfi1_free_ctxtdata after hfi1_postinit_cleanup invokes
1169 * dd->f_cleanup(dd) to disable the interrupt handler and flush workqueues,
1170 * so we're safe from use-after-free of the rcd.
1171 */
1172void receive_interrupt_work(struct work_struct *work)
1173{
1174 struct hfi1_pportdata *ppd = container_of(work, struct hfi1_pportdata,
1175 linkstate_active_work);
1176 struct hfi1_devdata *dd = ppd->dd;
1177 struct hfi1_ctxtdata *rcd;
1178 u16 i;
1179
1180 /* Received non-SC15 packet implies neighbor_normal */
1181 ppd->neighbor_normal = 1;
1182 set_link_state(ppd, HLS_UP_ACTIVE);
1183
1184 /*
1185 * Interrupt all statically allocated kernel contexts that could
1186 * have had an interrupt during auto activation.
1187 */
1188 for (i = HFI1_CTRL_CTXT; i < dd->first_dyn_alloc_ctxt; i++) {
1189 rcd = hfi1_rcd_get_by_index(dd, i);
1190 if (rcd)
1191 force_recv_intr(rcd);
1192 hfi1_rcd_put(rcd);
1193 }
1194}
1195
1196/*
1197 * Convert a given MTU size to the on-wire MAD packet enumeration.
1198 * Return -1 if the size is invalid.
1199 */
1200int mtu_to_enum(u32 mtu, int default_if_bad)
1201{
1202 switch (mtu) {
1203 case 0: return OPA_MTU_0;
1204 case 256: return OPA_MTU_256;
1205 case 512: return OPA_MTU_512;
1206 case 1024: return OPA_MTU_1024;
1207 case 2048: return OPA_MTU_2048;
1208 case 4096: return OPA_MTU_4096;
1209 case 8192: return OPA_MTU_8192;
1210 case 10240: return OPA_MTU_10240;
1211 }
1212 return default_if_bad;
1213}
1214
1215u16 enum_to_mtu(int mtu)
1216{
1217 switch (mtu) {
1218 case OPA_MTU_0: return 0;
1219 case OPA_MTU_256: return 256;
1220 case OPA_MTU_512: return 512;
1221 case OPA_MTU_1024: return 1024;
1222 case OPA_MTU_2048: return 2048;
1223 case OPA_MTU_4096: return 4096;
1224 case OPA_MTU_8192: return 8192;
1225 case OPA_MTU_10240: return 10240;
1226 default: return 0xffff;
1227 }
1228}
1229
1230/*
1231 * set_mtu - set the MTU
1232 * @ppd: the per port data
1233 *
1234 * We can handle "any" incoming size, the issue here is whether we
1235 * need to restrict our outgoing size. We do not deal with what happens
1236 * to programs that are already running when the size changes.
1237 */
1238int set_mtu(struct hfi1_pportdata *ppd)
1239{
1240 struct hfi1_devdata *dd = ppd->dd;
1241 int i, drain, ret = 0, is_up = 0;
1242
1243 ppd->ibmtu = 0;
1244 for (i = 0; i < ppd->vls_supported; i++)
1245 if (ppd->ibmtu < dd->vld[i].mtu)
1246 ppd->ibmtu = dd->vld[i].mtu;
1247 ppd->ibmaxlen = ppd->ibmtu + lrh_max_header_bytes(ppd->dd);
1248
1249 mutex_lock(&ppd->hls_lock);
1250 if (ppd->host_link_state == HLS_UP_INIT ||
1251 ppd->host_link_state == HLS_UP_ARMED ||
1252 ppd->host_link_state == HLS_UP_ACTIVE)
1253 is_up = 1;
1254
1255 drain = !is_ax(dd) && is_up;
1256
1257 if (drain)
1258 /*
1259 * MTU is specified per-VL. To ensure that no packet gets
1260 * stuck (due, e.g., to the MTU for the packet's VL being
1261 * reduced), empty the per-VL FIFOs before adjusting MTU.
1262 */
1263 ret = stop_drain_data_vls(dd);
1264
1265 if (ret) {
1266 dd_dev_err(dd, "%s: cannot stop/drain VLs - refusing to change per-VL MTUs\n",
1267 __func__);
1268 goto err;
1269 }
1270
1271 hfi1_set_ib_cfg(ppd, HFI1_IB_CFG_MTU, 0);
1272
1273 if (drain)
1274 open_fill_data_vls(dd); /* reopen all VLs */
1275
1276err:
1277 mutex_unlock(&ppd->hls_lock);
1278
1279 return ret;
1280}
1281
1282int hfi1_set_lid(struct hfi1_pportdata *ppd, u32 lid, u8 lmc)
1283{
1284 struct hfi1_devdata *dd = ppd->dd;
1285
1286 ppd->lid = lid;
1287 ppd->lmc = lmc;
1288 hfi1_set_ib_cfg(ppd, HFI1_IB_CFG_LIDLMC, 0);
1289
1290 dd_dev_info(dd, "port %u: got a lid: 0x%x\n", ppd->port, lid);
1291
1292 return 0;
1293}
1294
1295void shutdown_led_override(struct hfi1_pportdata *ppd)
1296{
1297 struct hfi1_devdata *dd = ppd->dd;
1298
1299 /*
1300 * This pairs with the memory barrier in hfi1_start_led_override to
1301 * ensure that we read the correct state of LED beaconing represented
1302 * by led_override_timer_active
1303 */
1304 smp_rmb();
1305 if (atomic_read(&ppd->led_override_timer_active)) {
1306 del_timer_sync(&ppd->led_override_timer);
1307 atomic_set(&ppd->led_override_timer_active, 0);
1308 /* Ensure the atomic_set is visible to all CPUs */
1309 smp_wmb();
1310 }
1311
1312 /* Hand control of the LED to the DC for normal operation */
1313 write_csr(dd, DCC_CFG_LED_CNTRL, 0);
1314}
1315
1316static void run_led_override(struct timer_list *t)
1317{
1318 struct hfi1_pportdata *ppd = from_timer(ppd, t, led_override_timer);
1319 struct hfi1_devdata *dd = ppd->dd;
1320 unsigned long timeout;
1321 int phase_idx;
1322
1323 if (!(dd->flags & HFI1_INITTED))
1324 return;
1325
1326 phase_idx = ppd->led_override_phase & 1;
1327
1328 setextled(dd, phase_idx);
1329
1330 timeout = ppd->led_override_vals[phase_idx];
1331
1332 /* Set up for next phase */
1333 ppd->led_override_phase = !ppd->led_override_phase;
1334
1335 mod_timer(&ppd->led_override_timer, jiffies + timeout);
1336}
1337
1338/*
1339 * To have the LED blink in a particular pattern, provide timeon and timeoff
1340 * in milliseconds.
1341 * To turn off custom blinking and return to normal operation, use
1342 * shutdown_led_override()
1343 */
1344void hfi1_start_led_override(struct hfi1_pportdata *ppd, unsigned int timeon,
1345 unsigned int timeoff)
1346{
1347 if (!(ppd->dd->flags & HFI1_INITTED))
1348 return;
1349
1350 /* Convert to jiffies for direct use in timer */
1351 ppd->led_override_vals[0] = msecs_to_jiffies(timeoff);
1352 ppd->led_override_vals[1] = msecs_to_jiffies(timeon);
1353
1354 /* Arbitrarily start from LED on phase */
1355 ppd->led_override_phase = 1;
1356
1357 /*
1358 * If the timer has not already been started, do so. Use a "quick"
1359 * timeout so the handler will be called soon to look at our request.
1360 */
1361 if (!timer_pending(&ppd->led_override_timer)) {
1362 timer_setup(&ppd->led_override_timer, run_led_override, 0);
1363 ppd->led_override_timer.expires = jiffies + 1;
1364 add_timer(&ppd->led_override_timer);
1365 atomic_set(&ppd->led_override_timer_active, 1);
1366 /* Ensure the atomic_set is visible to all CPUs */
1367 smp_wmb();
1368 }
1369}
1370
1371/**
1372 * hfi1_reset_device - reset the chip if possible
1373 * @unit: the device to reset
1374 *
1375 * Whether or not reset is successful, we attempt to re-initialize the chip
1376 * (that is, much like a driver unload/reload). We clear the INITTED flag
1377 * so that the various entry points will fail until we reinitialize. For
1378 * now, we only allow this if no user contexts are open that use chip resources
1379 */
1380int hfi1_reset_device(int unit)
1381{
1382 int ret;
1383 struct hfi1_devdata *dd = hfi1_lookup(unit);
1384 struct hfi1_pportdata *ppd;
1385 int pidx;
1386
1387 if (!dd) {
1388 ret = -ENODEV;
1389 goto bail;
1390 }
1391
1392 dd_dev_info(dd, "Reset on unit %u requested\n", unit);
1393
1394 if (!dd->kregbase1 || !(dd->flags & HFI1_PRESENT)) {
1395 dd_dev_info(dd,
1396 "Invalid unit number %u or not initialized or not present\n",
1397 unit);
1398 ret = -ENXIO;
1399 goto bail;
1400 }
1401
1402 /* If there are any user/vnic contexts, we cannot reset */
1403 mutex_lock(&hfi1_mutex);
1404 if (dd->rcd)
1405 if (hfi1_stats.sps_ctxts) {
1406 mutex_unlock(&hfi1_mutex);
1407 ret = -EBUSY;
1408 goto bail;
1409 }
1410 mutex_unlock(&hfi1_mutex);
1411
1412 for (pidx = 0; pidx < dd->num_pports; ++pidx) {
1413 ppd = dd->pport + pidx;
1414
1415 shutdown_led_override(ppd);
1416 }
1417 if (dd->flags & HFI1_HAS_SEND_DMA)
1418 sdma_exit(dd);
1419
1420 hfi1_reset_cpu_counters(dd);
1421
1422 ret = hfi1_init(dd, 1);
1423
1424 if (ret)
1425 dd_dev_err(dd,
1426 "Reinitialize unit %u after reset failed with %d\n",
1427 unit, ret);
1428 else
1429 dd_dev_info(dd, "Reinitialized unit %u after resetting\n",
1430 unit);
1431
1432bail:
1433 return ret;
1434}
1435
1436static inline void hfi1_setup_ib_header(struct hfi1_packet *packet)
1437{
1438 packet->hdr = (struct hfi1_ib_message_header *)
1439 hfi1_get_msgheader(packet->rcd,
1440 packet->rhf_addr);
1441 packet->hlen = (u8 *)packet->rhf_addr - (u8 *)packet->hdr;
1442}
1443
1444static int hfi1_bypass_ingress_pkt_check(struct hfi1_packet *packet)
1445{
1446 struct hfi1_pportdata *ppd = packet->rcd->ppd;
1447
1448 /* slid and dlid cannot be 0 */
1449 if ((!packet->slid) || (!packet->dlid))
1450 return -EINVAL;
1451
1452 /* Compare port lid with incoming packet dlid */
1453 if ((!(hfi1_is_16B_mcast(packet->dlid))) &&
1454 (packet->dlid !=
1455 opa_get_lid(be32_to_cpu(OPA_LID_PERMISSIVE), 16B))) {
1456 if ((packet->dlid & ~((1 << ppd->lmc) - 1)) != ppd->lid)
1457 return -EINVAL;
1458 }
1459
1460 /* No multicast packets with SC15 */
1461 if ((hfi1_is_16B_mcast(packet->dlid)) && (packet->sc == 0xF))
1462 return -EINVAL;
1463
1464 /* Packets with permissive DLID always on SC15 */
1465 if ((packet->dlid == opa_get_lid(be32_to_cpu(OPA_LID_PERMISSIVE),
1466 16B)) &&
1467 (packet->sc != 0xF))
1468 return -EINVAL;
1469
1470 return 0;
1471}
1472
1473static int hfi1_setup_9B_packet(struct hfi1_packet *packet)
1474{
1475 struct hfi1_ibport *ibp = rcd_to_iport(packet->rcd);
1476 struct ib_header *hdr;
1477 u8 lnh;
1478
1479 hfi1_setup_ib_header(packet);
1480 hdr = packet->hdr;
1481
1482 lnh = ib_get_lnh(hdr);
1483 if (lnh == HFI1_LRH_BTH) {
1484 packet->ohdr = &hdr->u.oth;
1485 packet->grh = NULL;
1486 } else if (lnh == HFI1_LRH_GRH) {
1487 u32 vtf;
1488
1489 packet->ohdr = &hdr->u.l.oth;
1490 packet->grh = &hdr->u.l.grh;
1491 if (packet->grh->next_hdr != IB_GRH_NEXT_HDR)
1492 goto drop;
1493 vtf = be32_to_cpu(packet->grh->version_tclass_flow);
1494 if ((vtf >> IB_GRH_VERSION_SHIFT) != IB_GRH_VERSION)
1495 goto drop;
1496 } else {
1497 goto drop;
1498 }
1499
1500 /* Query commonly used fields from packet header */
1501 packet->payload = packet->ebuf;
1502 packet->opcode = ib_bth_get_opcode(packet->ohdr);
1503 packet->slid = ib_get_slid(hdr);
1504 packet->dlid = ib_get_dlid(hdr);
1505 if (unlikely((packet->dlid >= be16_to_cpu(IB_MULTICAST_LID_BASE)) &&
1506 (packet->dlid != be16_to_cpu(IB_LID_PERMISSIVE))))
1507 packet->dlid += opa_get_mcast_base(OPA_MCAST_NR) -
1508 be16_to_cpu(IB_MULTICAST_LID_BASE);
1509 packet->sl = ib_get_sl(hdr);
1510 packet->sc = hfi1_9B_get_sc5(hdr, packet->rhf);
1511 packet->pad = ib_bth_get_pad(packet->ohdr);
1512 packet->extra_byte = 0;
1513 packet->pkey = ib_bth_get_pkey(packet->ohdr);
1514 packet->migrated = ib_bth_is_migration(packet->ohdr);
1515
1516 return 0;
1517drop:
1518 ibp->rvp.n_pkt_drops++;
1519 return -EINVAL;
1520}
1521
1522static int hfi1_setup_bypass_packet(struct hfi1_packet *packet)
1523{
1524 /*
1525 * Bypass packets have a different header/payload split
1526 * compared to an IB packet.
1527 * Current split is set such that 16 bytes of the actual
1528 * header is in the header buffer and the remining is in
1529 * the eager buffer. We chose 16 since hfi1 driver only
1530 * supports 16B bypass packets and we will be able to
1531 * receive the entire LRH with such a split.
1532 */
1533
1534 struct hfi1_ctxtdata *rcd = packet->rcd;
1535 struct hfi1_pportdata *ppd = rcd->ppd;
1536 struct hfi1_ibport *ibp = &ppd->ibport_data;
1537 u8 l4;
1538
1539 packet->hdr = (struct hfi1_16b_header *)
1540 hfi1_get_16B_header(packet->rcd,
1541 packet->rhf_addr);
1542 l4 = hfi1_16B_get_l4(packet->hdr);
1543 if (l4 == OPA_16B_L4_IB_LOCAL) {
1544 packet->ohdr = packet->ebuf;
1545 packet->grh = NULL;
1546 packet->opcode = ib_bth_get_opcode(packet->ohdr);
1547 packet->pad = hfi1_16B_bth_get_pad(packet->ohdr);
1548 /* hdr_len_by_opcode already has an IB LRH factored in */
1549 packet->hlen = hdr_len_by_opcode[packet->opcode] +
1550 (LRH_16B_BYTES - LRH_9B_BYTES);
1551 packet->migrated = opa_bth_is_migration(packet->ohdr);
1552 } else if (l4 == OPA_16B_L4_IB_GLOBAL) {
1553 u32 vtf;
1554 u8 grh_len = sizeof(struct ib_grh);
1555
1556 packet->ohdr = packet->ebuf + grh_len;
1557 packet->grh = packet->ebuf;
1558 packet->opcode = ib_bth_get_opcode(packet->ohdr);
1559 packet->pad = hfi1_16B_bth_get_pad(packet->ohdr);
1560 /* hdr_len_by_opcode already has an IB LRH factored in */
1561 packet->hlen = hdr_len_by_opcode[packet->opcode] +
1562 (LRH_16B_BYTES - LRH_9B_BYTES) + grh_len;
1563 packet->migrated = opa_bth_is_migration(packet->ohdr);
1564
1565 if (packet->grh->next_hdr != IB_GRH_NEXT_HDR)
1566 goto drop;
1567 vtf = be32_to_cpu(packet->grh->version_tclass_flow);
1568 if ((vtf >> IB_GRH_VERSION_SHIFT) != IB_GRH_VERSION)
1569 goto drop;
1570 } else if (l4 == OPA_16B_L4_FM) {
1571 packet->mgmt = packet->ebuf;
1572 packet->ohdr = NULL;
1573 packet->grh = NULL;
1574 packet->opcode = IB_OPCODE_UD_SEND_ONLY;
1575 packet->pad = OPA_16B_L4_FM_PAD;
1576 packet->hlen = OPA_16B_L4_FM_HLEN;
1577 packet->migrated = false;
1578 } else {
1579 goto drop;
1580 }
1581
1582 /* Query commonly used fields from packet header */
1583 packet->payload = packet->ebuf + packet->hlen - LRH_16B_BYTES;
1584 packet->slid = hfi1_16B_get_slid(packet->hdr);
1585 packet->dlid = hfi1_16B_get_dlid(packet->hdr);
1586 if (unlikely(hfi1_is_16B_mcast(packet->dlid)))
1587 packet->dlid += opa_get_mcast_base(OPA_MCAST_NR) -
1588 opa_get_lid(opa_get_mcast_base(OPA_MCAST_NR),
1589 16B);
1590 packet->sc = hfi1_16B_get_sc(packet->hdr);
1591 packet->sl = ibp->sc_to_sl[packet->sc];
1592 packet->extra_byte = SIZE_OF_LT;
1593 packet->pkey = hfi1_16B_get_pkey(packet->hdr);
1594
1595 if (hfi1_bypass_ingress_pkt_check(packet))
1596 goto drop;
1597
1598 return 0;
1599drop:
1600 hfi1_cdbg(PKT, "%s: packet dropped", __func__);
1601 ibp->rvp.n_pkt_drops++;
1602 return -EINVAL;
1603}
1604
1605static void show_eflags_errs(struct hfi1_packet *packet)
1606{
1607 struct hfi1_ctxtdata *rcd = packet->rcd;
1608 u32 rte = rhf_rcv_type_err(packet->rhf);
1609
1610 dd_dev_err(rcd->dd,
1611 "receive context %d: rhf 0x%016llx, errs [ %s%s%s%s%s%s%s] rte 0x%x\n",
1612 rcd->ctxt, packet->rhf,
1613 packet->rhf & RHF_K_HDR_LEN_ERR ? "k_hdr_len " : "",
1614 packet->rhf & RHF_DC_UNC_ERR ? "dc_unc " : "",
1615 packet->rhf & RHF_DC_ERR ? "dc " : "",
1616 packet->rhf & RHF_TID_ERR ? "tid " : "",
1617 packet->rhf & RHF_LEN_ERR ? "len " : "",
1618 packet->rhf & RHF_ECC_ERR ? "ecc " : "",
1619 packet->rhf & RHF_ICRC_ERR ? "icrc " : "",
1620 rte);
1621}
1622
1623void handle_eflags(struct hfi1_packet *packet)
1624{
1625 struct hfi1_ctxtdata *rcd = packet->rcd;
1626
1627 rcv_hdrerr(rcd, rcd->ppd, packet);
1628 if (rhf_err_flags(packet->rhf))
1629 show_eflags_errs(packet);
1630}
1631
1632static void hfi1_ipoib_ib_rcv(struct hfi1_packet *packet)
1633{
1634 struct hfi1_ibport *ibp;
1635 struct net_device *netdev;
1636 struct hfi1_ctxtdata *rcd = packet->rcd;
1637 struct napi_struct *napi = rcd->napi;
1638 struct sk_buff *skb;
1639 struct hfi1_netdev_rxq *rxq = container_of(napi,
1640 struct hfi1_netdev_rxq, napi);
1641 u32 extra_bytes;
1642 u32 tlen, qpnum;
1643 bool do_work, do_cnp;
1644
1645 trace_hfi1_rcvhdr(packet);
1646
1647 hfi1_setup_ib_header(packet);
1648
1649 packet->ohdr = &((struct ib_header *)packet->hdr)->u.oth;
1650 packet->grh = NULL;
1651
1652 if (unlikely(rhf_err_flags(packet->rhf))) {
1653 handle_eflags(packet);
1654 return;
1655 }
1656
1657 qpnum = ib_bth_get_qpn(packet->ohdr);
1658 netdev = hfi1_netdev_get_data(rcd->dd, qpnum);
1659 if (!netdev)
1660 goto drop_no_nd;
1661
1662 trace_input_ibhdr(rcd->dd, packet, !!(rhf_dc_info(packet->rhf)));
1663 trace_ctxt_rsm_hist(rcd->ctxt);
1664
1665 /* handle congestion notifications */
1666 do_work = hfi1_may_ecn(packet);
1667 if (unlikely(do_work)) {
1668 do_cnp = (packet->opcode != IB_OPCODE_CNP);
1669 (void)hfi1_process_ecn_slowpath(hfi1_ipoib_priv(netdev)->qp,
1670 packet, do_cnp);
1671 }
1672
1673 /*
1674 * We have split point after last byte of DETH
1675 * lets strip padding and CRC and ICRC.
1676 * tlen is whole packet len so we need to
1677 * subtract header size as well.
1678 */
1679 tlen = packet->tlen;
1680 extra_bytes = ib_bth_get_pad(packet->ohdr) + (SIZE_OF_CRC << 2) +
1681 packet->hlen;
1682 if (unlikely(tlen < extra_bytes))
1683 goto drop;
1684
1685 tlen -= extra_bytes;
1686
1687 skb = hfi1_ipoib_prepare_skb(rxq, tlen, packet->ebuf);
1688 if (unlikely(!skb))
1689 goto drop;
1690
1691 dev_sw_netstats_rx_add(netdev, skb->len);
1692
1693 skb->dev = netdev;
1694 skb->pkt_type = PACKET_HOST;
1695 netif_receive_skb(skb);
1696
1697 return;
1698
1699drop:
1700 ++netdev->stats.rx_dropped;
1701drop_no_nd:
1702 ibp = rcd_to_iport(packet->rcd);
1703 ++ibp->rvp.n_pkt_drops;
1704}
1705
1706/*
1707 * The following functions are called by the interrupt handler. They are type
1708 * specific handlers for each packet type.
1709 */
1710static void process_receive_ib(struct hfi1_packet *packet)
1711{
1712 if (hfi1_setup_9B_packet(packet))
1713 return;
1714
1715 if (unlikely(hfi1_dbg_should_fault_rx(packet)))
1716 return;
1717
1718 trace_hfi1_rcvhdr(packet);
1719
1720 if (unlikely(rhf_err_flags(packet->rhf))) {
1721 handle_eflags(packet);
1722 return;
1723 }
1724
1725 hfi1_ib_rcv(packet);
1726}
1727
1728static void process_receive_bypass(struct hfi1_packet *packet)
1729{
1730 struct hfi1_devdata *dd = packet->rcd->dd;
1731
1732 if (hfi1_setup_bypass_packet(packet))
1733 return;
1734
1735 trace_hfi1_rcvhdr(packet);
1736
1737 if (unlikely(rhf_err_flags(packet->rhf))) {
1738 handle_eflags(packet);
1739 return;
1740 }
1741
1742 if (hfi1_16B_get_l2(packet->hdr) == 0x2) {
1743 hfi1_16B_rcv(packet);
1744 } else {
1745 dd_dev_err(dd,
1746 "Bypass packets other than 16B are not supported in normal operation. Dropping\n");
1747 incr_cntr64(&dd->sw_rcv_bypass_packet_errors);
1748 if (!(dd->err_info_rcvport.status_and_code &
1749 OPA_EI_STATUS_SMASK)) {
1750 u64 *flits = packet->ebuf;
1751
1752 if (flits && !(packet->rhf & RHF_LEN_ERR)) {
1753 dd->err_info_rcvport.packet_flit1 = flits[0];
1754 dd->err_info_rcvport.packet_flit2 =
1755 packet->tlen > sizeof(flits[0]) ?
1756 flits[1] : 0;
1757 }
1758 dd->err_info_rcvport.status_and_code |=
1759 (OPA_EI_STATUS_SMASK | BAD_L2_ERR);
1760 }
1761 }
1762}
1763
1764static void process_receive_error(struct hfi1_packet *packet)
1765{
1766 /* KHdrHCRCErr -- KDETH packet with a bad HCRC */
1767 if (unlikely(
1768 hfi1_dbg_fault_suppress_err(&packet->rcd->dd->verbs_dev) &&
1769 (rhf_rcv_type_err(packet->rhf) == RHF_RCV_TYPE_ERROR ||
1770 packet->rhf & RHF_DC_ERR)))
1771 return;
1772
1773 hfi1_setup_ib_header(packet);
1774 handle_eflags(packet);
1775
1776 if (unlikely(rhf_err_flags(packet->rhf)))
1777 dd_dev_err(packet->rcd->dd,
1778 "Unhandled error packet received. Dropping.\n");
1779}
1780
1781static void kdeth_process_expected(struct hfi1_packet *packet)
1782{
1783 hfi1_setup_9B_packet(packet);
1784 if (unlikely(hfi1_dbg_should_fault_rx(packet)))
1785 return;
1786
1787 if (unlikely(rhf_err_flags(packet->rhf))) {
1788 struct hfi1_ctxtdata *rcd = packet->rcd;
1789
1790 if (hfi1_handle_kdeth_eflags(rcd, rcd->ppd, packet))
1791 return;
1792 }
1793
1794 hfi1_kdeth_expected_rcv(packet);
1795}
1796
1797static void kdeth_process_eager(struct hfi1_packet *packet)
1798{
1799 hfi1_setup_9B_packet(packet);
1800 if (unlikely(hfi1_dbg_should_fault_rx(packet)))
1801 return;
1802
1803 trace_hfi1_rcvhdr(packet);
1804 if (unlikely(rhf_err_flags(packet->rhf))) {
1805 struct hfi1_ctxtdata *rcd = packet->rcd;
1806
1807 show_eflags_errs(packet);
1808 if (hfi1_handle_kdeth_eflags(rcd, rcd->ppd, packet))
1809 return;
1810 }
1811
1812 hfi1_kdeth_eager_rcv(packet);
1813}
1814
1815static void process_receive_invalid(struct hfi1_packet *packet)
1816{
1817 dd_dev_err(packet->rcd->dd, "Invalid packet type %d. Dropping\n",
1818 rhf_rcv_type(packet->rhf));
1819}
1820
1821#define HFI1_RCVHDR_DUMP_MAX 5
1822
1823void seqfile_dump_rcd(struct seq_file *s, struct hfi1_ctxtdata *rcd)
1824{
1825 struct hfi1_packet packet;
1826 struct ps_mdata mdata;
1827 int i;
1828
1829 seq_printf(s, "Rcd %u: RcvHdr cnt %u entsize %u %s ctrl 0x%08llx status 0x%08llx, head %llu tail %llu sw head %u\n",
1830 rcd->ctxt, get_hdrq_cnt(rcd), get_hdrqentsize(rcd),
1831 get_dma_rtail_setting(rcd) ?
1832 "dma_rtail" : "nodma_rtail",
1833 read_kctxt_csr(rcd->dd, rcd->ctxt, RCV_CTXT_CTRL),
1834 read_kctxt_csr(rcd->dd, rcd->ctxt, RCV_CTXT_STATUS),
1835 read_uctxt_csr(rcd->dd, rcd->ctxt, RCV_HDR_HEAD) &
1836 RCV_HDR_HEAD_HEAD_MASK,
1837 read_uctxt_csr(rcd->dd, rcd->ctxt, RCV_HDR_TAIL),
1838 rcd->head);
1839
1840 init_packet(rcd, &packet);
1841 init_ps_mdata(&mdata, &packet);
1842
1843 for (i = 0; i < HFI1_RCVHDR_DUMP_MAX; i++) {
1844 __le32 *rhf_addr = (__le32 *)rcd->rcvhdrq + mdata.ps_head +
1845 rcd->rhf_offset;
1846 struct ib_header *hdr;
1847 u64 rhf = rhf_to_cpu(rhf_addr);
1848 u32 etype = rhf_rcv_type(rhf), qpn;
1849 u8 opcode;
1850 u32 psn;
1851 u8 lnh;
1852
1853 if (ps_done(&mdata, rhf, rcd))
1854 break;
1855
1856 if (ps_skip(&mdata, rhf, rcd))
1857 goto next;
1858
1859 if (etype > RHF_RCV_TYPE_IB)
1860 goto next;
1861
1862 packet.hdr = hfi1_get_msgheader(rcd, rhf_addr);
1863 hdr = packet.hdr;
1864
1865 lnh = be16_to_cpu(hdr->lrh[0]) & 3;
1866
1867 if (lnh == HFI1_LRH_BTH)
1868 packet.ohdr = &hdr->u.oth;
1869 else if (lnh == HFI1_LRH_GRH)
1870 packet.ohdr = &hdr->u.l.oth;
1871 else
1872 goto next; /* just in case */
1873
1874 opcode = (be32_to_cpu(packet.ohdr->bth[0]) >> 24);
1875 qpn = be32_to_cpu(packet.ohdr->bth[1]) & RVT_QPN_MASK;
1876 psn = mask_psn(be32_to_cpu(packet.ohdr->bth[2]));
1877
1878 seq_printf(s, "\tEnt %u: opcode 0x%x, qpn 0x%x, psn 0x%x\n",
1879 mdata.ps_head, opcode, qpn, psn);
1880next:
1881 update_ps_mdata(&mdata, rcd);
1882 }
1883}
1884
1885const rhf_rcv_function_ptr normal_rhf_rcv_functions[] = {
1886 [RHF_RCV_TYPE_EXPECTED] = kdeth_process_expected,
1887 [RHF_RCV_TYPE_EAGER] = kdeth_process_eager,
1888 [RHF_RCV_TYPE_IB] = process_receive_ib,
1889 [RHF_RCV_TYPE_ERROR] = process_receive_error,
1890 [RHF_RCV_TYPE_BYPASS] = process_receive_bypass,
1891 [RHF_RCV_TYPE_INVALID5] = process_receive_invalid,
1892 [RHF_RCV_TYPE_INVALID6] = process_receive_invalid,
1893 [RHF_RCV_TYPE_INVALID7] = process_receive_invalid,
1894};
1895
1896const rhf_rcv_function_ptr netdev_rhf_rcv_functions[] = {
1897 [RHF_RCV_TYPE_EXPECTED] = process_receive_invalid,
1898 [RHF_RCV_TYPE_EAGER] = process_receive_invalid,
1899 [RHF_RCV_TYPE_IB] = hfi1_ipoib_ib_rcv,
1900 [RHF_RCV_TYPE_ERROR] = process_receive_error,
1901 [RHF_RCV_TYPE_BYPASS] = hfi1_vnic_bypass_rcv,
1902 [RHF_RCV_TYPE_INVALID5] = process_receive_invalid,
1903 [RHF_RCV_TYPE_INVALID6] = process_receive_invalid,
1904 [RHF_RCV_TYPE_INVALID7] = process_receive_invalid,
1905};
1/*
2 * Copyright(c) 2015-2017 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
48#include <linux/spinlock.h>
49#include <linux/pci.h>
50#include <linux/io.h>
51#include <linux/delay.h>
52#include <linux/netdevice.h>
53#include <linux/vmalloc.h>
54#include <linux/module.h>
55#include <linux/prefetch.h>
56#include <rdma/ib_verbs.h>
57
58#include "hfi.h"
59#include "trace.h"
60#include "qp.h"
61#include "sdma.h"
62#include "debugfs.h"
63#include "vnic.h"
64
65#undef pr_fmt
66#define pr_fmt(fmt) DRIVER_NAME ": " fmt
67
68/*
69 * The size has to be longer than this string, so we can append
70 * board/chip information to it in the initialization code.
71 */
72const char ib_hfi1_version[] = HFI1_DRIVER_VERSION "\n";
73
74DEFINE_SPINLOCK(hfi1_devs_lock);
75LIST_HEAD(hfi1_dev_list);
76DEFINE_MUTEX(hfi1_mutex); /* general driver use */
77
78unsigned int hfi1_max_mtu = HFI1_DEFAULT_MAX_MTU;
79module_param_named(max_mtu, hfi1_max_mtu, uint, S_IRUGO);
80MODULE_PARM_DESC(max_mtu, "Set max MTU bytes, default is " __stringify(
81 HFI1_DEFAULT_MAX_MTU));
82
83unsigned int hfi1_cu = 1;
84module_param_named(cu, hfi1_cu, uint, S_IRUGO);
85MODULE_PARM_DESC(cu, "Credit return units");
86
87unsigned long hfi1_cap_mask = HFI1_CAP_MASK_DEFAULT;
88static int hfi1_caps_set(const char *val, const struct kernel_param *kp);
89static int hfi1_caps_get(char *buffer, const struct kernel_param *kp);
90static const struct kernel_param_ops cap_ops = {
91 .set = hfi1_caps_set,
92 .get = hfi1_caps_get
93};
94module_param_cb(cap_mask, &cap_ops, &hfi1_cap_mask, S_IWUSR | S_IRUGO);
95MODULE_PARM_DESC(cap_mask, "Bit mask of enabled/disabled HW features");
96
97MODULE_LICENSE("Dual BSD/GPL");
98MODULE_DESCRIPTION("Intel Omni-Path Architecture driver");
99
100/*
101 * MAX_PKT_RCV is the max # if packets processed per receive interrupt.
102 */
103#define MAX_PKT_RECV 64
104/*
105 * MAX_PKT_THREAD_RCV is the max # of packets processed before
106 * the qp_wait_list queue is flushed.
107 */
108#define MAX_PKT_RECV_THREAD (MAX_PKT_RECV * 4)
109#define EGR_HEAD_UPDATE_THRESHOLD 16
110
111struct hfi1_ib_stats hfi1_stats;
112
113static int hfi1_caps_set(const char *val, const struct kernel_param *kp)
114{
115 int ret = 0;
116 unsigned long *cap_mask_ptr = (unsigned long *)kp->arg,
117 cap_mask = *cap_mask_ptr, value, diff,
118 write_mask = ((HFI1_CAP_WRITABLE_MASK << HFI1_CAP_USER_SHIFT) |
119 HFI1_CAP_WRITABLE_MASK);
120
121 ret = kstrtoul(val, 0, &value);
122 if (ret) {
123 pr_warn("Invalid module parameter value for 'cap_mask'\n");
124 goto done;
125 }
126 /* Get the changed bits (except the locked bit) */
127 diff = value ^ (cap_mask & ~HFI1_CAP_LOCKED_SMASK);
128
129 /* Remove any bits that are not allowed to change after driver load */
130 if (HFI1_CAP_LOCKED() && (diff & ~write_mask)) {
131 pr_warn("Ignoring non-writable capability bits %#lx\n",
132 diff & ~write_mask);
133 diff &= write_mask;
134 }
135
136 /* Mask off any reserved bits */
137 diff &= ~HFI1_CAP_RESERVED_MASK;
138 /* Clear any previously set and changing bits */
139 cap_mask &= ~diff;
140 /* Update the bits with the new capability */
141 cap_mask |= (value & diff);
142 /* Check for any kernel/user restrictions */
143 diff = (cap_mask & (HFI1_CAP_MUST_HAVE_KERN << HFI1_CAP_USER_SHIFT)) ^
144 ((cap_mask & HFI1_CAP_MUST_HAVE_KERN) << HFI1_CAP_USER_SHIFT);
145 cap_mask &= ~diff;
146 /* Set the bitmask to the final set */
147 *cap_mask_ptr = cap_mask;
148done:
149 return ret;
150}
151
152static int hfi1_caps_get(char *buffer, const struct kernel_param *kp)
153{
154 unsigned long cap_mask = *(unsigned long *)kp->arg;
155
156 cap_mask &= ~HFI1_CAP_LOCKED_SMASK;
157 cap_mask |= ((cap_mask & HFI1_CAP_K2U) << HFI1_CAP_USER_SHIFT);
158
159 return scnprintf(buffer, PAGE_SIZE, "0x%lx", cap_mask);
160}
161
162struct pci_dev *get_pci_dev(struct rvt_dev_info *rdi)
163{
164 struct hfi1_ibdev *ibdev = container_of(rdi, struct hfi1_ibdev, rdi);
165 struct hfi1_devdata *dd = container_of(ibdev,
166 struct hfi1_devdata, verbs_dev);
167 return dd->pcidev;
168}
169
170/*
171 * Return count of units with at least one port ACTIVE.
172 */
173int hfi1_count_active_units(void)
174{
175 struct hfi1_devdata *dd;
176 struct hfi1_pportdata *ppd;
177 unsigned long flags;
178 int pidx, nunits_active = 0;
179
180 spin_lock_irqsave(&hfi1_devs_lock, flags);
181 list_for_each_entry(dd, &hfi1_dev_list, list) {
182 if (!(dd->flags & HFI1_PRESENT) || !dd->kregbase1)
183 continue;
184 for (pidx = 0; pidx < dd->num_pports; ++pidx) {
185 ppd = dd->pport + pidx;
186 if (ppd->lid && ppd->linkup) {
187 nunits_active++;
188 break;
189 }
190 }
191 }
192 spin_unlock_irqrestore(&hfi1_devs_lock, flags);
193 return nunits_active;
194}
195
196/*
197 * Get address of eager buffer from it's index (allocated in chunks, not
198 * contiguous).
199 */
200static inline void *get_egrbuf(const struct hfi1_ctxtdata *rcd, u64 rhf,
201 u8 *update)
202{
203 u32 idx = rhf_egr_index(rhf), offset = rhf_egr_buf_offset(rhf);
204
205 *update |= !(idx & (rcd->egrbufs.threshold - 1)) && !offset;
206 return (void *)(((u64)(rcd->egrbufs.rcvtids[idx].addr)) +
207 (offset * RCV_BUF_BLOCK_SIZE));
208}
209
210static inline void *hfi1_get_header(struct hfi1_devdata *dd,
211 __le32 *rhf_addr)
212{
213 u32 offset = rhf_hdrq_offset(rhf_to_cpu(rhf_addr));
214
215 return (void *)(rhf_addr - dd->rhf_offset + offset);
216}
217
218static inline struct ib_header *hfi1_get_msgheader(struct hfi1_devdata *dd,
219 __le32 *rhf_addr)
220{
221 return (struct ib_header *)hfi1_get_header(dd, rhf_addr);
222}
223
224static inline struct hfi1_16b_header
225 *hfi1_get_16B_header(struct hfi1_devdata *dd,
226 __le32 *rhf_addr)
227{
228 return (struct hfi1_16b_header *)hfi1_get_header(dd, rhf_addr);
229}
230
231/*
232 * Validate and encode the a given RcvArray Buffer size.
233 * The function will check whether the given size falls within
234 * allowed size ranges for the respective type and, optionally,
235 * return the proper encoding.
236 */
237int hfi1_rcvbuf_validate(u32 size, u8 type, u16 *encoded)
238{
239 if (unlikely(!PAGE_ALIGNED(size)))
240 return 0;
241 if (unlikely(size < MIN_EAGER_BUFFER))
242 return 0;
243 if (size >
244 (type == PT_EAGER ? MAX_EAGER_BUFFER : MAX_EXPECTED_BUFFER))
245 return 0;
246 if (encoded)
247 *encoded = ilog2(size / PAGE_SIZE) + 1;
248 return 1;
249}
250
251static void rcv_hdrerr(struct hfi1_ctxtdata *rcd, struct hfi1_pportdata *ppd,
252 struct hfi1_packet *packet)
253{
254 struct ib_header *rhdr = packet->hdr;
255 u32 rte = rhf_rcv_type_err(packet->rhf);
256 u32 mlid_base;
257 struct hfi1_ibport *ibp = rcd_to_iport(rcd);
258 struct hfi1_devdata *dd = ppd->dd;
259 struct hfi1_ibdev *verbs_dev = &dd->verbs_dev;
260 struct rvt_dev_info *rdi = &verbs_dev->rdi;
261
262 if ((packet->rhf & RHF_DC_ERR) &&
263 hfi1_dbg_fault_suppress_err(verbs_dev))
264 return;
265
266 if (packet->rhf & (RHF_VCRC_ERR | RHF_ICRC_ERR))
267 return;
268
269 if (packet->etype == RHF_RCV_TYPE_BYPASS) {
270 goto drop;
271 } else {
272 u8 lnh = ib_get_lnh(rhdr);
273
274 mlid_base = be16_to_cpu(IB_MULTICAST_LID_BASE);
275 if (lnh == HFI1_LRH_BTH) {
276 packet->ohdr = &rhdr->u.oth;
277 } else if (lnh == HFI1_LRH_GRH) {
278 packet->ohdr = &rhdr->u.l.oth;
279 packet->grh = &rhdr->u.l.grh;
280 } else {
281 goto drop;
282 }
283 }
284
285 if (packet->rhf & RHF_TID_ERR) {
286 /* For TIDERR and RC QPs preemptively schedule a NAK */
287 u32 tlen = rhf_pkt_len(packet->rhf); /* in bytes */
288 u32 dlid = ib_get_dlid(rhdr);
289 u32 qp_num;
290
291 /* Sanity check packet */
292 if (tlen < 24)
293 goto drop;
294
295 /* Check for GRH */
296 if (packet->grh) {
297 u32 vtf;
298 struct ib_grh *grh = packet->grh;
299
300 if (grh->next_hdr != IB_GRH_NEXT_HDR)
301 goto drop;
302 vtf = be32_to_cpu(grh->version_tclass_flow);
303 if ((vtf >> IB_GRH_VERSION_SHIFT) != IB_GRH_VERSION)
304 goto drop;
305 }
306
307 /* Get the destination QP number. */
308 qp_num = ib_bth_get_qpn(packet->ohdr);
309 if (dlid < mlid_base) {
310 struct rvt_qp *qp;
311 unsigned long flags;
312
313 rcu_read_lock();
314 qp = rvt_lookup_qpn(rdi, &ibp->rvp, qp_num);
315 if (!qp) {
316 rcu_read_unlock();
317 goto drop;
318 }
319
320 /*
321 * Handle only RC QPs - for other QP types drop error
322 * packet.
323 */
324 spin_lock_irqsave(&qp->r_lock, flags);
325
326 /* Check for valid receive state. */
327 if (!(ib_rvt_state_ops[qp->state] &
328 RVT_PROCESS_RECV_OK)) {
329 ibp->rvp.n_pkt_drops++;
330 }
331
332 switch (qp->ibqp.qp_type) {
333 case IB_QPT_RC:
334 hfi1_rc_hdrerr(rcd, packet, qp);
335 break;
336 default:
337 /* For now don't handle any other QP types */
338 break;
339 }
340
341 spin_unlock_irqrestore(&qp->r_lock, flags);
342 rcu_read_unlock();
343 } /* Unicast QP */
344 } /* Valid packet with TIDErr */
345
346 /* handle "RcvTypeErr" flags */
347 switch (rte) {
348 case RHF_RTE_ERROR_OP_CODE_ERR:
349 {
350 void *ebuf = NULL;
351 u8 opcode;
352
353 if (rhf_use_egr_bfr(packet->rhf))
354 ebuf = packet->ebuf;
355
356 if (!ebuf)
357 goto drop; /* this should never happen */
358
359 opcode = ib_bth_get_opcode(packet->ohdr);
360 if (opcode == IB_OPCODE_CNP) {
361 /*
362 * Only in pre-B0 h/w is the CNP_OPCODE handled
363 * via this code path.
364 */
365 struct rvt_qp *qp = NULL;
366 u32 lqpn, rqpn;
367 u16 rlid;
368 u8 svc_type, sl, sc5;
369
370 sc5 = hfi1_9B_get_sc5(rhdr, packet->rhf);
371 sl = ibp->sc_to_sl[sc5];
372
373 lqpn = ib_bth_get_qpn(packet->ohdr);
374 rcu_read_lock();
375 qp = rvt_lookup_qpn(rdi, &ibp->rvp, lqpn);
376 if (!qp) {
377 rcu_read_unlock();
378 goto drop;
379 }
380
381 switch (qp->ibqp.qp_type) {
382 case IB_QPT_UD:
383 rlid = 0;
384 rqpn = 0;
385 svc_type = IB_CC_SVCTYPE_UD;
386 break;
387 case IB_QPT_UC:
388 rlid = ib_get_slid(rhdr);
389 rqpn = qp->remote_qpn;
390 svc_type = IB_CC_SVCTYPE_UC;
391 break;
392 default:
393 rcu_read_unlock();
394 goto drop;
395 }
396
397 process_becn(ppd, sl, rlid, lqpn, rqpn, svc_type);
398 rcu_read_unlock();
399 }
400
401 packet->rhf &= ~RHF_RCV_TYPE_ERR_SMASK;
402 break;
403 }
404 default:
405 break;
406 }
407
408drop:
409 return;
410}
411
412static inline void init_packet(struct hfi1_ctxtdata *rcd,
413 struct hfi1_packet *packet)
414{
415 packet->rsize = rcd->rcvhdrqentsize; /* words */
416 packet->maxcnt = rcd->rcvhdrq_cnt * packet->rsize; /* words */
417 packet->rcd = rcd;
418 packet->updegr = 0;
419 packet->etail = -1;
420 packet->rhf_addr = get_rhf_addr(rcd);
421 packet->rhf = rhf_to_cpu(packet->rhf_addr);
422 packet->rhqoff = rcd->head;
423 packet->numpkt = 0;
424}
425
426/* We support only two types - 9B and 16B for now */
427static const hfi1_handle_cnp hfi1_handle_cnp_tbl[2] = {
428 [HFI1_PKT_TYPE_9B] = &return_cnp,
429 [HFI1_PKT_TYPE_16B] = &return_cnp_16B
430};
431
432void hfi1_process_ecn_slowpath(struct rvt_qp *qp, struct hfi1_packet *pkt,
433 bool do_cnp)
434{
435 struct hfi1_ibport *ibp = to_iport(qp->ibqp.device, qp->port_num);
436 struct hfi1_pportdata *ppd = ppd_from_ibp(ibp);
437 struct ib_other_headers *ohdr = pkt->ohdr;
438 struct ib_grh *grh = pkt->grh;
439 u32 rqpn = 0, bth1;
440 u16 pkey;
441 u32 rlid, slid, dlid = 0;
442 u8 hdr_type, sc, svc_type;
443 bool is_mcast = false;
444
445 /* can be called from prescan */
446 if (pkt->etype == RHF_RCV_TYPE_BYPASS) {
447 is_mcast = hfi1_is_16B_mcast(dlid);
448 pkey = hfi1_16B_get_pkey(pkt->hdr);
449 sc = hfi1_16B_get_sc(pkt->hdr);
450 dlid = hfi1_16B_get_dlid(pkt->hdr);
451 slid = hfi1_16B_get_slid(pkt->hdr);
452 hdr_type = HFI1_PKT_TYPE_16B;
453 } else {
454 is_mcast = (dlid > be16_to_cpu(IB_MULTICAST_LID_BASE)) &&
455 (dlid != be16_to_cpu(IB_LID_PERMISSIVE));
456 pkey = ib_bth_get_pkey(ohdr);
457 sc = hfi1_9B_get_sc5(pkt->hdr, pkt->rhf);
458 dlid = ib_get_dlid(pkt->hdr);
459 slid = ib_get_slid(pkt->hdr);
460 hdr_type = HFI1_PKT_TYPE_9B;
461 }
462
463 switch (qp->ibqp.qp_type) {
464 case IB_QPT_UD:
465 dlid = ppd->lid;
466 rlid = slid;
467 rqpn = ib_get_sqpn(pkt->ohdr);
468 svc_type = IB_CC_SVCTYPE_UD;
469 break;
470 case IB_QPT_SMI:
471 case IB_QPT_GSI:
472 rlid = slid;
473 rqpn = ib_get_sqpn(pkt->ohdr);
474 svc_type = IB_CC_SVCTYPE_UD;
475 break;
476 case IB_QPT_UC:
477 rlid = rdma_ah_get_dlid(&qp->remote_ah_attr);
478 rqpn = qp->remote_qpn;
479 svc_type = IB_CC_SVCTYPE_UC;
480 break;
481 case IB_QPT_RC:
482 rlid = rdma_ah_get_dlid(&qp->remote_ah_attr);
483 rqpn = qp->remote_qpn;
484 svc_type = IB_CC_SVCTYPE_RC;
485 break;
486 default:
487 return;
488 }
489
490 bth1 = be32_to_cpu(ohdr->bth[1]);
491 /* Call appropriate CNP handler */
492 if (do_cnp && (bth1 & IB_FECN_SMASK))
493 hfi1_handle_cnp_tbl[hdr_type](ibp, qp, rqpn, pkey,
494 dlid, rlid, sc, grh);
495
496 if (!is_mcast && (bth1 & IB_BECN_SMASK)) {
497 u32 lqpn = bth1 & RVT_QPN_MASK;
498 u8 sl = ibp->sc_to_sl[sc];
499
500 process_becn(ppd, sl, rlid, lqpn, rqpn, svc_type);
501 }
502
503}
504
505struct ps_mdata {
506 struct hfi1_ctxtdata *rcd;
507 u32 rsize;
508 u32 maxcnt;
509 u32 ps_head;
510 u32 ps_tail;
511 u32 ps_seq;
512};
513
514static inline void init_ps_mdata(struct ps_mdata *mdata,
515 struct hfi1_packet *packet)
516{
517 struct hfi1_ctxtdata *rcd = packet->rcd;
518
519 mdata->rcd = rcd;
520 mdata->rsize = packet->rsize;
521 mdata->maxcnt = packet->maxcnt;
522 mdata->ps_head = packet->rhqoff;
523
524 if (HFI1_CAP_KGET_MASK(rcd->flags, DMA_RTAIL)) {
525 mdata->ps_tail = get_rcvhdrtail(rcd);
526 if (rcd->ctxt == HFI1_CTRL_CTXT)
527 mdata->ps_seq = rcd->seq_cnt;
528 else
529 mdata->ps_seq = 0; /* not used with DMA_RTAIL */
530 } else {
531 mdata->ps_tail = 0; /* used only with DMA_RTAIL*/
532 mdata->ps_seq = rcd->seq_cnt;
533 }
534}
535
536static inline int ps_done(struct ps_mdata *mdata, u64 rhf,
537 struct hfi1_ctxtdata *rcd)
538{
539 if (HFI1_CAP_KGET_MASK(rcd->flags, DMA_RTAIL))
540 return mdata->ps_head == mdata->ps_tail;
541 return mdata->ps_seq != rhf_rcv_seq(rhf);
542}
543
544static inline int ps_skip(struct ps_mdata *mdata, u64 rhf,
545 struct hfi1_ctxtdata *rcd)
546{
547 /*
548 * Control context can potentially receive an invalid rhf.
549 * Drop such packets.
550 */
551 if ((rcd->ctxt == HFI1_CTRL_CTXT) && (mdata->ps_head != mdata->ps_tail))
552 return mdata->ps_seq != rhf_rcv_seq(rhf);
553
554 return 0;
555}
556
557static inline void update_ps_mdata(struct ps_mdata *mdata,
558 struct hfi1_ctxtdata *rcd)
559{
560 mdata->ps_head += mdata->rsize;
561 if (mdata->ps_head >= mdata->maxcnt)
562 mdata->ps_head = 0;
563
564 /* Control context must do seq counting */
565 if (!HFI1_CAP_KGET_MASK(rcd->flags, DMA_RTAIL) ||
566 (rcd->ctxt == HFI1_CTRL_CTXT)) {
567 if (++mdata->ps_seq > 13)
568 mdata->ps_seq = 1;
569 }
570}
571
572/*
573 * prescan_rxq - search through the receive queue looking for packets
574 * containing Excplicit Congestion Notifications (FECNs, or BECNs).
575 * When an ECN is found, process the Congestion Notification, and toggle
576 * it off.
577 * This is declared as a macro to allow quick checking of the port to avoid
578 * the overhead of a function call if not enabled.
579 */
580#define prescan_rxq(rcd, packet) \
581 do { \
582 if (rcd->ppd->cc_prescan) \
583 __prescan_rxq(packet); \
584 } while (0)
585static void __prescan_rxq(struct hfi1_packet *packet)
586{
587 struct hfi1_ctxtdata *rcd = packet->rcd;
588 struct ps_mdata mdata;
589
590 init_ps_mdata(&mdata, packet);
591
592 while (1) {
593 struct hfi1_devdata *dd = rcd->dd;
594 struct hfi1_ibport *ibp = rcd_to_iport(rcd);
595 __le32 *rhf_addr = (__le32 *)rcd->rcvhdrq + mdata.ps_head +
596 dd->rhf_offset;
597 struct rvt_qp *qp;
598 struct ib_header *hdr;
599 struct rvt_dev_info *rdi = &dd->verbs_dev.rdi;
600 u64 rhf = rhf_to_cpu(rhf_addr);
601 u32 etype = rhf_rcv_type(rhf), qpn, bth1;
602 int is_ecn = 0;
603 u8 lnh;
604
605 if (ps_done(&mdata, rhf, rcd))
606 break;
607
608 if (ps_skip(&mdata, rhf, rcd))
609 goto next;
610
611 if (etype != RHF_RCV_TYPE_IB)
612 goto next;
613
614 packet->hdr = hfi1_get_msgheader(dd, rhf_addr);
615 hdr = packet->hdr;
616 lnh = ib_get_lnh(hdr);
617
618 if (lnh == HFI1_LRH_BTH) {
619 packet->ohdr = &hdr->u.oth;
620 packet->grh = NULL;
621 } else if (lnh == HFI1_LRH_GRH) {
622 packet->ohdr = &hdr->u.l.oth;
623 packet->grh = &hdr->u.l.grh;
624 } else {
625 goto next; /* just in case */
626 }
627
628 bth1 = be32_to_cpu(packet->ohdr->bth[1]);
629 is_ecn = !!(bth1 & (IB_FECN_SMASK | IB_BECN_SMASK));
630
631 if (!is_ecn)
632 goto next;
633
634 qpn = bth1 & RVT_QPN_MASK;
635 rcu_read_lock();
636 qp = rvt_lookup_qpn(rdi, &ibp->rvp, qpn);
637
638 if (!qp) {
639 rcu_read_unlock();
640 goto next;
641 }
642
643 process_ecn(qp, packet, true);
644 rcu_read_unlock();
645
646 /* turn off BECN, FECN */
647 bth1 &= ~(IB_FECN_SMASK | IB_BECN_SMASK);
648 packet->ohdr->bth[1] = cpu_to_be32(bth1);
649next:
650 update_ps_mdata(&mdata, rcd);
651 }
652}
653
654static void process_rcv_qp_work(struct hfi1_packet *packet)
655{
656 struct rvt_qp *qp, *nqp;
657 struct hfi1_ctxtdata *rcd = packet->rcd;
658
659 /*
660 * Iterate over all QPs waiting to respond.
661 * The list won't change since the IRQ is only run on one CPU.
662 */
663 list_for_each_entry_safe(qp, nqp, &rcd->qp_wait_list, rspwait) {
664 list_del_init(&qp->rspwait);
665 if (qp->r_flags & RVT_R_RSP_NAK) {
666 qp->r_flags &= ~RVT_R_RSP_NAK;
667 packet->qp = qp;
668 hfi1_send_rc_ack(packet, 0);
669 }
670 if (qp->r_flags & RVT_R_RSP_SEND) {
671 unsigned long flags;
672
673 qp->r_flags &= ~RVT_R_RSP_SEND;
674 spin_lock_irqsave(&qp->s_lock, flags);
675 if (ib_rvt_state_ops[qp->state] &
676 RVT_PROCESS_OR_FLUSH_SEND)
677 hfi1_schedule_send(qp);
678 spin_unlock_irqrestore(&qp->s_lock, flags);
679 }
680 rvt_put_qp(qp);
681 }
682}
683
684static noinline int max_packet_exceeded(struct hfi1_packet *packet, int thread)
685{
686 if (thread) {
687 if ((packet->numpkt & (MAX_PKT_RECV_THREAD - 1)) == 0)
688 /* allow defered processing */
689 process_rcv_qp_work(packet);
690 cond_resched();
691 return RCV_PKT_OK;
692 } else {
693 this_cpu_inc(*packet->rcd->dd->rcv_limit);
694 return RCV_PKT_LIMIT;
695 }
696}
697
698static inline int check_max_packet(struct hfi1_packet *packet, int thread)
699{
700 int ret = RCV_PKT_OK;
701
702 if (unlikely((packet->numpkt & (MAX_PKT_RECV - 1)) == 0))
703 ret = max_packet_exceeded(packet, thread);
704 return ret;
705}
706
707static noinline int skip_rcv_packet(struct hfi1_packet *packet, int thread)
708{
709 int ret;
710
711 /* Set up for the next packet */
712 packet->rhqoff += packet->rsize;
713 if (packet->rhqoff >= packet->maxcnt)
714 packet->rhqoff = 0;
715
716 packet->numpkt++;
717 ret = check_max_packet(packet, thread);
718
719 packet->rhf_addr = (__le32 *)packet->rcd->rcvhdrq + packet->rhqoff +
720 packet->rcd->dd->rhf_offset;
721 packet->rhf = rhf_to_cpu(packet->rhf_addr);
722
723 return ret;
724}
725
726static inline int process_rcv_packet(struct hfi1_packet *packet, int thread)
727{
728 int ret;
729
730 packet->etype = rhf_rcv_type(packet->rhf);
731
732 /* total length */
733 packet->tlen = rhf_pkt_len(packet->rhf); /* in bytes */
734 /* retrieve eager buffer details */
735 packet->ebuf = NULL;
736 if (rhf_use_egr_bfr(packet->rhf)) {
737 packet->etail = rhf_egr_index(packet->rhf);
738 packet->ebuf = get_egrbuf(packet->rcd, packet->rhf,
739 &packet->updegr);
740 /*
741 * Prefetch the contents of the eager buffer. It is
742 * OK to send a negative length to prefetch_range().
743 * The +2 is the size of the RHF.
744 */
745 prefetch_range(packet->ebuf,
746 packet->tlen - ((packet->rcd->rcvhdrqentsize -
747 (rhf_hdrq_offset(packet->rhf)
748 + 2)) * 4));
749 }
750
751 /*
752 * Call a type specific handler for the packet. We
753 * should be able to trust that etype won't be beyond
754 * the range of valid indexes. If so something is really
755 * wrong and we can probably just let things come
756 * crashing down. There is no need to eat another
757 * comparison in this performance critical code.
758 */
759 packet->rcd->dd->rhf_rcv_function_map[packet->etype](packet);
760 packet->numpkt++;
761
762 /* Set up for the next packet */
763 packet->rhqoff += packet->rsize;
764 if (packet->rhqoff >= packet->maxcnt)
765 packet->rhqoff = 0;
766
767 ret = check_max_packet(packet, thread);
768
769 packet->rhf_addr = (__le32 *)packet->rcd->rcvhdrq + packet->rhqoff +
770 packet->rcd->dd->rhf_offset;
771 packet->rhf = rhf_to_cpu(packet->rhf_addr);
772
773 return ret;
774}
775
776static inline void process_rcv_update(int last, struct hfi1_packet *packet)
777{
778 /*
779 * Update head regs etc., every 16 packets, if not last pkt,
780 * to help prevent rcvhdrq overflows, when many packets
781 * are processed and queue is nearly full.
782 * Don't request an interrupt for intermediate updates.
783 */
784 if (!last && !(packet->numpkt & 0xf)) {
785 update_usrhead(packet->rcd, packet->rhqoff, packet->updegr,
786 packet->etail, 0, 0);
787 packet->updegr = 0;
788 }
789 packet->grh = NULL;
790}
791
792static inline void finish_packet(struct hfi1_packet *packet)
793{
794 /*
795 * Nothing we need to free for the packet.
796 *
797 * The only thing we need to do is a final update and call for an
798 * interrupt
799 */
800 update_usrhead(packet->rcd, packet->rcd->head, packet->updegr,
801 packet->etail, rcv_intr_dynamic, packet->numpkt);
802}
803
804/*
805 * Handle receive interrupts when using the no dma rtail option.
806 */
807int handle_receive_interrupt_nodma_rtail(struct hfi1_ctxtdata *rcd, int thread)
808{
809 u32 seq;
810 int last = RCV_PKT_OK;
811 struct hfi1_packet packet;
812
813 init_packet(rcd, &packet);
814 seq = rhf_rcv_seq(packet.rhf);
815 if (seq != rcd->seq_cnt) {
816 last = RCV_PKT_DONE;
817 goto bail;
818 }
819
820 prescan_rxq(rcd, &packet);
821
822 while (last == RCV_PKT_OK) {
823 last = process_rcv_packet(&packet, thread);
824 seq = rhf_rcv_seq(packet.rhf);
825 if (++rcd->seq_cnt > 13)
826 rcd->seq_cnt = 1;
827 if (seq != rcd->seq_cnt)
828 last = RCV_PKT_DONE;
829 process_rcv_update(last, &packet);
830 }
831 process_rcv_qp_work(&packet);
832 rcd->head = packet.rhqoff;
833bail:
834 finish_packet(&packet);
835 return last;
836}
837
838int handle_receive_interrupt_dma_rtail(struct hfi1_ctxtdata *rcd, int thread)
839{
840 u32 hdrqtail;
841 int last = RCV_PKT_OK;
842 struct hfi1_packet packet;
843
844 init_packet(rcd, &packet);
845 hdrqtail = get_rcvhdrtail(rcd);
846 if (packet.rhqoff == hdrqtail) {
847 last = RCV_PKT_DONE;
848 goto bail;
849 }
850 smp_rmb(); /* prevent speculative reads of dma'ed hdrq */
851
852 prescan_rxq(rcd, &packet);
853
854 while (last == RCV_PKT_OK) {
855 last = process_rcv_packet(&packet, thread);
856 if (packet.rhqoff == hdrqtail)
857 last = RCV_PKT_DONE;
858 process_rcv_update(last, &packet);
859 }
860 process_rcv_qp_work(&packet);
861 rcd->head = packet.rhqoff;
862bail:
863 finish_packet(&packet);
864 return last;
865}
866
867static inline void set_nodma_rtail(struct hfi1_devdata *dd, u16 ctxt)
868{
869 struct hfi1_ctxtdata *rcd;
870 u16 i;
871
872 /*
873 * For dynamically allocated kernel contexts (like vnic) switch
874 * interrupt handler only for that context. Otherwise, switch
875 * interrupt handler for all statically allocated kernel contexts.
876 */
877 if (ctxt >= dd->first_dyn_alloc_ctxt) {
878 rcd = hfi1_rcd_get_by_index_safe(dd, ctxt);
879 if (rcd) {
880 rcd->do_interrupt =
881 &handle_receive_interrupt_nodma_rtail;
882 hfi1_rcd_put(rcd);
883 }
884 return;
885 }
886
887 for (i = HFI1_CTRL_CTXT + 1; i < dd->first_dyn_alloc_ctxt; i++) {
888 rcd = hfi1_rcd_get_by_index(dd, i);
889 if (rcd)
890 rcd->do_interrupt =
891 &handle_receive_interrupt_nodma_rtail;
892 hfi1_rcd_put(rcd);
893 }
894}
895
896static inline void set_dma_rtail(struct hfi1_devdata *dd, u16 ctxt)
897{
898 struct hfi1_ctxtdata *rcd;
899 u16 i;
900
901 /*
902 * For dynamically allocated kernel contexts (like vnic) switch
903 * interrupt handler only for that context. Otherwise, switch
904 * interrupt handler for all statically allocated kernel contexts.
905 */
906 if (ctxt >= dd->first_dyn_alloc_ctxt) {
907 rcd = hfi1_rcd_get_by_index_safe(dd, ctxt);
908 if (rcd) {
909 rcd->do_interrupt =
910 &handle_receive_interrupt_dma_rtail;
911 hfi1_rcd_put(rcd);
912 }
913 return;
914 }
915
916 for (i = HFI1_CTRL_CTXT + 1; i < dd->first_dyn_alloc_ctxt; i++) {
917 rcd = hfi1_rcd_get_by_index(dd, i);
918 if (rcd)
919 rcd->do_interrupt =
920 &handle_receive_interrupt_dma_rtail;
921 hfi1_rcd_put(rcd);
922 }
923}
924
925void set_all_slowpath(struct hfi1_devdata *dd)
926{
927 struct hfi1_ctxtdata *rcd;
928 u16 i;
929
930 /* HFI1_CTRL_CTXT must always use the slow path interrupt handler */
931 for (i = HFI1_CTRL_CTXT + 1; i < dd->num_rcv_contexts; i++) {
932 rcd = hfi1_rcd_get_by_index(dd, i);
933 if (!rcd)
934 continue;
935 if (i < dd->first_dyn_alloc_ctxt || rcd->is_vnic)
936 rcd->do_interrupt = &handle_receive_interrupt;
937
938 hfi1_rcd_put(rcd);
939 }
940}
941
942static inline int set_armed_to_active(struct hfi1_ctxtdata *rcd,
943 struct hfi1_packet *packet,
944 struct hfi1_devdata *dd)
945{
946 struct work_struct *lsaw = &rcd->ppd->linkstate_active_work;
947 u8 etype = rhf_rcv_type(packet->rhf);
948 u8 sc = SC15_PACKET;
949
950 if (etype == RHF_RCV_TYPE_IB) {
951 struct ib_header *hdr = hfi1_get_msgheader(packet->rcd->dd,
952 packet->rhf_addr);
953 sc = hfi1_9B_get_sc5(hdr, packet->rhf);
954 } else if (etype == RHF_RCV_TYPE_BYPASS) {
955 struct hfi1_16b_header *hdr = hfi1_get_16B_header(
956 packet->rcd->dd,
957 packet->rhf_addr);
958 sc = hfi1_16B_get_sc(hdr);
959 }
960 if (sc != SC15_PACKET) {
961 int hwstate = driver_lstate(rcd->ppd);
962
963 if (hwstate != IB_PORT_ACTIVE) {
964 dd_dev_info(dd,
965 "Unexpected link state %s\n",
966 opa_lstate_name(hwstate));
967 return 0;
968 }
969
970 queue_work(rcd->ppd->link_wq, lsaw);
971 return 1;
972 }
973 return 0;
974}
975
976/*
977 * handle_receive_interrupt - receive a packet
978 * @rcd: the context
979 *
980 * Called from interrupt handler for errors or receive interrupt.
981 * This is the slow path interrupt handler.
982 */
983int handle_receive_interrupt(struct hfi1_ctxtdata *rcd, int thread)
984{
985 struct hfi1_devdata *dd = rcd->dd;
986 u32 hdrqtail;
987 int needset, last = RCV_PKT_OK;
988 struct hfi1_packet packet;
989 int skip_pkt = 0;
990
991 /* Control context will always use the slow path interrupt handler */
992 needset = (rcd->ctxt == HFI1_CTRL_CTXT) ? 0 : 1;
993
994 init_packet(rcd, &packet);
995
996 if (!HFI1_CAP_KGET_MASK(rcd->flags, DMA_RTAIL)) {
997 u32 seq = rhf_rcv_seq(packet.rhf);
998
999 if (seq != rcd->seq_cnt) {
1000 last = RCV_PKT_DONE;
1001 goto bail;
1002 }
1003 hdrqtail = 0;
1004 } else {
1005 hdrqtail = get_rcvhdrtail(rcd);
1006 if (packet.rhqoff == hdrqtail) {
1007 last = RCV_PKT_DONE;
1008 goto bail;
1009 }
1010 smp_rmb(); /* prevent speculative reads of dma'ed hdrq */
1011
1012 /*
1013 * Control context can potentially receive an invalid
1014 * rhf. Drop such packets.
1015 */
1016 if (rcd->ctxt == HFI1_CTRL_CTXT) {
1017 u32 seq = rhf_rcv_seq(packet.rhf);
1018
1019 if (seq != rcd->seq_cnt)
1020 skip_pkt = 1;
1021 }
1022 }
1023
1024 prescan_rxq(rcd, &packet);
1025
1026 while (last == RCV_PKT_OK) {
1027 if (unlikely(dd->do_drop &&
1028 atomic_xchg(&dd->drop_packet, DROP_PACKET_OFF) ==
1029 DROP_PACKET_ON)) {
1030 dd->do_drop = 0;
1031
1032 /* On to the next packet */
1033 packet.rhqoff += packet.rsize;
1034 packet.rhf_addr = (__le32 *)rcd->rcvhdrq +
1035 packet.rhqoff +
1036 dd->rhf_offset;
1037 packet.rhf = rhf_to_cpu(packet.rhf_addr);
1038
1039 } else if (skip_pkt) {
1040 last = skip_rcv_packet(&packet, thread);
1041 skip_pkt = 0;
1042 } else {
1043 /* Auto activate link on non-SC15 packet receive */
1044 if (unlikely(rcd->ppd->host_link_state ==
1045 HLS_UP_ARMED) &&
1046 set_armed_to_active(rcd, &packet, dd))
1047 goto bail;
1048 last = process_rcv_packet(&packet, thread);
1049 }
1050
1051 if (!HFI1_CAP_KGET_MASK(rcd->flags, DMA_RTAIL)) {
1052 u32 seq = rhf_rcv_seq(packet.rhf);
1053
1054 if (++rcd->seq_cnt > 13)
1055 rcd->seq_cnt = 1;
1056 if (seq != rcd->seq_cnt)
1057 last = RCV_PKT_DONE;
1058 if (needset) {
1059 dd_dev_info(dd, "Switching to NO_DMA_RTAIL\n");
1060 set_nodma_rtail(dd, rcd->ctxt);
1061 needset = 0;
1062 }
1063 } else {
1064 if (packet.rhqoff == hdrqtail)
1065 last = RCV_PKT_DONE;
1066 /*
1067 * Control context can potentially receive an invalid
1068 * rhf. Drop such packets.
1069 */
1070 if (rcd->ctxt == HFI1_CTRL_CTXT) {
1071 u32 seq = rhf_rcv_seq(packet.rhf);
1072
1073 if (++rcd->seq_cnt > 13)
1074 rcd->seq_cnt = 1;
1075 if (!last && (seq != rcd->seq_cnt))
1076 skip_pkt = 1;
1077 }
1078
1079 if (needset) {
1080 dd_dev_info(dd,
1081 "Switching to DMA_RTAIL\n");
1082 set_dma_rtail(dd, rcd->ctxt);
1083 needset = 0;
1084 }
1085 }
1086
1087 process_rcv_update(last, &packet);
1088 }
1089
1090 process_rcv_qp_work(&packet);
1091 rcd->head = packet.rhqoff;
1092
1093bail:
1094 /*
1095 * Always write head at end, and setup rcv interrupt, even
1096 * if no packets were processed.
1097 */
1098 finish_packet(&packet);
1099 return last;
1100}
1101
1102/*
1103 * We may discover in the interrupt that the hardware link state has
1104 * changed from ARMED to ACTIVE (due to the arrival of a non-SC15 packet),
1105 * and we need to update the driver's notion of the link state. We cannot
1106 * run set_link_state from interrupt context, so we queue this function on
1107 * a workqueue.
1108 *
1109 * We delay the regular interrupt processing until after the state changes
1110 * so that the link will be in the correct state by the time any application
1111 * we wake up attempts to send a reply to any message it received.
1112 * (Subsequent receive interrupts may possibly force the wakeup before we
1113 * update the link state.)
1114 *
1115 * The rcd is freed in hfi1_free_ctxtdata after hfi1_postinit_cleanup invokes
1116 * dd->f_cleanup(dd) to disable the interrupt handler and flush workqueues,
1117 * so we're safe from use-after-free of the rcd.
1118 */
1119void receive_interrupt_work(struct work_struct *work)
1120{
1121 struct hfi1_pportdata *ppd = container_of(work, struct hfi1_pportdata,
1122 linkstate_active_work);
1123 struct hfi1_devdata *dd = ppd->dd;
1124 struct hfi1_ctxtdata *rcd;
1125 u16 i;
1126
1127 /* Received non-SC15 packet implies neighbor_normal */
1128 ppd->neighbor_normal = 1;
1129 set_link_state(ppd, HLS_UP_ACTIVE);
1130
1131 /*
1132 * Interrupt all statically allocated kernel contexts that could
1133 * have had an interrupt during auto activation.
1134 */
1135 for (i = HFI1_CTRL_CTXT; i < dd->first_dyn_alloc_ctxt; i++) {
1136 rcd = hfi1_rcd_get_by_index(dd, i);
1137 if (rcd)
1138 force_recv_intr(rcd);
1139 hfi1_rcd_put(rcd);
1140 }
1141}
1142
1143/*
1144 * Convert a given MTU size to the on-wire MAD packet enumeration.
1145 * Return -1 if the size is invalid.
1146 */
1147int mtu_to_enum(u32 mtu, int default_if_bad)
1148{
1149 switch (mtu) {
1150 case 0: return OPA_MTU_0;
1151 case 256: return OPA_MTU_256;
1152 case 512: return OPA_MTU_512;
1153 case 1024: return OPA_MTU_1024;
1154 case 2048: return OPA_MTU_2048;
1155 case 4096: return OPA_MTU_4096;
1156 case 8192: return OPA_MTU_8192;
1157 case 10240: return OPA_MTU_10240;
1158 }
1159 return default_if_bad;
1160}
1161
1162u16 enum_to_mtu(int mtu)
1163{
1164 switch (mtu) {
1165 case OPA_MTU_0: return 0;
1166 case OPA_MTU_256: return 256;
1167 case OPA_MTU_512: return 512;
1168 case OPA_MTU_1024: return 1024;
1169 case OPA_MTU_2048: return 2048;
1170 case OPA_MTU_4096: return 4096;
1171 case OPA_MTU_8192: return 8192;
1172 case OPA_MTU_10240: return 10240;
1173 default: return 0xffff;
1174 }
1175}
1176
1177/*
1178 * set_mtu - set the MTU
1179 * @ppd: the per port data
1180 *
1181 * We can handle "any" incoming size, the issue here is whether we
1182 * need to restrict our outgoing size. We do not deal with what happens
1183 * to programs that are already running when the size changes.
1184 */
1185int set_mtu(struct hfi1_pportdata *ppd)
1186{
1187 struct hfi1_devdata *dd = ppd->dd;
1188 int i, drain, ret = 0, is_up = 0;
1189
1190 ppd->ibmtu = 0;
1191 for (i = 0; i < ppd->vls_supported; i++)
1192 if (ppd->ibmtu < dd->vld[i].mtu)
1193 ppd->ibmtu = dd->vld[i].mtu;
1194 ppd->ibmaxlen = ppd->ibmtu + lrh_max_header_bytes(ppd->dd);
1195
1196 mutex_lock(&ppd->hls_lock);
1197 if (ppd->host_link_state == HLS_UP_INIT ||
1198 ppd->host_link_state == HLS_UP_ARMED ||
1199 ppd->host_link_state == HLS_UP_ACTIVE)
1200 is_up = 1;
1201
1202 drain = !is_ax(dd) && is_up;
1203
1204 if (drain)
1205 /*
1206 * MTU is specified per-VL. To ensure that no packet gets
1207 * stuck (due, e.g., to the MTU for the packet's VL being
1208 * reduced), empty the per-VL FIFOs before adjusting MTU.
1209 */
1210 ret = stop_drain_data_vls(dd);
1211
1212 if (ret) {
1213 dd_dev_err(dd, "%s: cannot stop/drain VLs - refusing to change per-VL MTUs\n",
1214 __func__);
1215 goto err;
1216 }
1217
1218 hfi1_set_ib_cfg(ppd, HFI1_IB_CFG_MTU, 0);
1219
1220 if (drain)
1221 open_fill_data_vls(dd); /* reopen all VLs */
1222
1223err:
1224 mutex_unlock(&ppd->hls_lock);
1225
1226 return ret;
1227}
1228
1229int hfi1_set_lid(struct hfi1_pportdata *ppd, u32 lid, u8 lmc)
1230{
1231 struct hfi1_devdata *dd = ppd->dd;
1232
1233 ppd->lid = lid;
1234 ppd->lmc = lmc;
1235 hfi1_set_ib_cfg(ppd, HFI1_IB_CFG_LIDLMC, 0);
1236
1237 dd_dev_info(dd, "port %u: got a lid: 0x%x\n", ppd->port, lid);
1238
1239 return 0;
1240}
1241
1242void shutdown_led_override(struct hfi1_pportdata *ppd)
1243{
1244 struct hfi1_devdata *dd = ppd->dd;
1245
1246 /*
1247 * This pairs with the memory barrier in hfi1_start_led_override to
1248 * ensure that we read the correct state of LED beaconing represented
1249 * by led_override_timer_active
1250 */
1251 smp_rmb();
1252 if (atomic_read(&ppd->led_override_timer_active)) {
1253 del_timer_sync(&ppd->led_override_timer);
1254 atomic_set(&ppd->led_override_timer_active, 0);
1255 /* Ensure the atomic_set is visible to all CPUs */
1256 smp_wmb();
1257 }
1258
1259 /* Hand control of the LED to the DC for normal operation */
1260 write_csr(dd, DCC_CFG_LED_CNTRL, 0);
1261}
1262
1263static void run_led_override(struct timer_list *t)
1264{
1265 struct hfi1_pportdata *ppd = from_timer(ppd, t, led_override_timer);
1266 struct hfi1_devdata *dd = ppd->dd;
1267 unsigned long timeout;
1268 int phase_idx;
1269
1270 if (!(dd->flags & HFI1_INITTED))
1271 return;
1272
1273 phase_idx = ppd->led_override_phase & 1;
1274
1275 setextled(dd, phase_idx);
1276
1277 timeout = ppd->led_override_vals[phase_idx];
1278
1279 /* Set up for next phase */
1280 ppd->led_override_phase = !ppd->led_override_phase;
1281
1282 mod_timer(&ppd->led_override_timer, jiffies + timeout);
1283}
1284
1285/*
1286 * To have the LED blink in a particular pattern, provide timeon and timeoff
1287 * in milliseconds.
1288 * To turn off custom blinking and return to normal operation, use
1289 * shutdown_led_override()
1290 */
1291void hfi1_start_led_override(struct hfi1_pportdata *ppd, unsigned int timeon,
1292 unsigned int timeoff)
1293{
1294 if (!(ppd->dd->flags & HFI1_INITTED))
1295 return;
1296
1297 /* Convert to jiffies for direct use in timer */
1298 ppd->led_override_vals[0] = msecs_to_jiffies(timeoff);
1299 ppd->led_override_vals[1] = msecs_to_jiffies(timeon);
1300
1301 /* Arbitrarily start from LED on phase */
1302 ppd->led_override_phase = 1;
1303
1304 /*
1305 * If the timer has not already been started, do so. Use a "quick"
1306 * timeout so the handler will be called soon to look at our request.
1307 */
1308 if (!timer_pending(&ppd->led_override_timer)) {
1309 timer_setup(&ppd->led_override_timer, run_led_override, 0);
1310 ppd->led_override_timer.expires = jiffies + 1;
1311 add_timer(&ppd->led_override_timer);
1312 atomic_set(&ppd->led_override_timer_active, 1);
1313 /* Ensure the atomic_set is visible to all CPUs */
1314 smp_wmb();
1315 }
1316}
1317
1318/**
1319 * hfi1_reset_device - reset the chip if possible
1320 * @unit: the device to reset
1321 *
1322 * Whether or not reset is successful, we attempt to re-initialize the chip
1323 * (that is, much like a driver unload/reload). We clear the INITTED flag
1324 * so that the various entry points will fail until we reinitialize. For
1325 * now, we only allow this if no user contexts are open that use chip resources
1326 */
1327int hfi1_reset_device(int unit)
1328{
1329 int ret;
1330 struct hfi1_devdata *dd = hfi1_lookup(unit);
1331 struct hfi1_pportdata *ppd;
1332 int pidx;
1333
1334 if (!dd) {
1335 ret = -ENODEV;
1336 goto bail;
1337 }
1338
1339 dd_dev_info(dd, "Reset on unit %u requested\n", unit);
1340
1341 if (!dd->kregbase1 || !(dd->flags & HFI1_PRESENT)) {
1342 dd_dev_info(dd,
1343 "Invalid unit number %u or not initialized or not present\n",
1344 unit);
1345 ret = -ENXIO;
1346 goto bail;
1347 }
1348
1349 /* If there are any user/vnic contexts, we cannot reset */
1350 mutex_lock(&hfi1_mutex);
1351 if (dd->rcd)
1352 if (hfi1_stats.sps_ctxts) {
1353 mutex_unlock(&hfi1_mutex);
1354 ret = -EBUSY;
1355 goto bail;
1356 }
1357 mutex_unlock(&hfi1_mutex);
1358
1359 for (pidx = 0; pidx < dd->num_pports; ++pidx) {
1360 ppd = dd->pport + pidx;
1361
1362 shutdown_led_override(ppd);
1363 }
1364 if (dd->flags & HFI1_HAS_SEND_DMA)
1365 sdma_exit(dd);
1366
1367 hfi1_reset_cpu_counters(dd);
1368
1369 ret = hfi1_init(dd, 1);
1370
1371 if (ret)
1372 dd_dev_err(dd,
1373 "Reinitialize unit %u after reset failed with %d\n",
1374 unit, ret);
1375 else
1376 dd_dev_info(dd, "Reinitialized unit %u after resetting\n",
1377 unit);
1378
1379bail:
1380 return ret;
1381}
1382
1383static inline void hfi1_setup_ib_header(struct hfi1_packet *packet)
1384{
1385 packet->hdr = (struct hfi1_ib_message_header *)
1386 hfi1_get_msgheader(packet->rcd->dd,
1387 packet->rhf_addr);
1388 packet->hlen = (u8 *)packet->rhf_addr - (u8 *)packet->hdr;
1389}
1390
1391static int hfi1_bypass_ingress_pkt_check(struct hfi1_packet *packet)
1392{
1393 struct hfi1_pportdata *ppd = packet->rcd->ppd;
1394
1395 /* slid and dlid cannot be 0 */
1396 if ((!packet->slid) || (!packet->dlid))
1397 return -EINVAL;
1398
1399 /* Compare port lid with incoming packet dlid */
1400 if ((!(hfi1_is_16B_mcast(packet->dlid))) &&
1401 (packet->dlid !=
1402 opa_get_lid(be32_to_cpu(OPA_LID_PERMISSIVE), 16B))) {
1403 if (packet->dlid != ppd->lid)
1404 return -EINVAL;
1405 }
1406
1407 /* No multicast packets with SC15 */
1408 if ((hfi1_is_16B_mcast(packet->dlid)) && (packet->sc == 0xF))
1409 return -EINVAL;
1410
1411 /* Packets with permissive DLID always on SC15 */
1412 if ((packet->dlid == opa_get_lid(be32_to_cpu(OPA_LID_PERMISSIVE),
1413 16B)) &&
1414 (packet->sc != 0xF))
1415 return -EINVAL;
1416
1417 return 0;
1418}
1419
1420static int hfi1_setup_9B_packet(struct hfi1_packet *packet)
1421{
1422 struct hfi1_ibport *ibp = rcd_to_iport(packet->rcd);
1423 struct ib_header *hdr;
1424 u8 lnh;
1425
1426 hfi1_setup_ib_header(packet);
1427 hdr = packet->hdr;
1428
1429 lnh = ib_get_lnh(hdr);
1430 if (lnh == HFI1_LRH_BTH) {
1431 packet->ohdr = &hdr->u.oth;
1432 packet->grh = NULL;
1433 } else if (lnh == HFI1_LRH_GRH) {
1434 u32 vtf;
1435
1436 packet->ohdr = &hdr->u.l.oth;
1437 packet->grh = &hdr->u.l.grh;
1438 if (packet->grh->next_hdr != IB_GRH_NEXT_HDR)
1439 goto drop;
1440 vtf = be32_to_cpu(packet->grh->version_tclass_flow);
1441 if ((vtf >> IB_GRH_VERSION_SHIFT) != IB_GRH_VERSION)
1442 goto drop;
1443 } else {
1444 goto drop;
1445 }
1446
1447 /* Query commonly used fields from packet header */
1448 packet->payload = packet->ebuf;
1449 packet->opcode = ib_bth_get_opcode(packet->ohdr);
1450 packet->slid = ib_get_slid(hdr);
1451 packet->dlid = ib_get_dlid(hdr);
1452 if (unlikely((packet->dlid >= be16_to_cpu(IB_MULTICAST_LID_BASE)) &&
1453 (packet->dlid != be16_to_cpu(IB_LID_PERMISSIVE))))
1454 packet->dlid += opa_get_mcast_base(OPA_MCAST_NR) -
1455 be16_to_cpu(IB_MULTICAST_LID_BASE);
1456 packet->sl = ib_get_sl(hdr);
1457 packet->sc = hfi1_9B_get_sc5(hdr, packet->rhf);
1458 packet->pad = ib_bth_get_pad(packet->ohdr);
1459 packet->extra_byte = 0;
1460 packet->pkey = ib_bth_get_pkey(packet->ohdr);
1461 packet->migrated = ib_bth_is_migration(packet->ohdr);
1462
1463 return 0;
1464drop:
1465 ibp->rvp.n_pkt_drops++;
1466 return -EINVAL;
1467}
1468
1469static int hfi1_setup_bypass_packet(struct hfi1_packet *packet)
1470{
1471 /*
1472 * Bypass packets have a different header/payload split
1473 * compared to an IB packet.
1474 * Current split is set such that 16 bytes of the actual
1475 * header is in the header buffer and the remining is in
1476 * the eager buffer. We chose 16 since hfi1 driver only
1477 * supports 16B bypass packets and we will be able to
1478 * receive the entire LRH with such a split.
1479 */
1480
1481 struct hfi1_ctxtdata *rcd = packet->rcd;
1482 struct hfi1_pportdata *ppd = rcd->ppd;
1483 struct hfi1_ibport *ibp = &ppd->ibport_data;
1484 u8 l4;
1485 u8 grh_len;
1486
1487 packet->hdr = (struct hfi1_16b_header *)
1488 hfi1_get_16B_header(packet->rcd->dd,
1489 packet->rhf_addr);
1490 packet->hlen = (u8 *)packet->rhf_addr - (u8 *)packet->hdr;
1491
1492 l4 = hfi1_16B_get_l4(packet->hdr);
1493 if (l4 == OPA_16B_L4_IB_LOCAL) {
1494 grh_len = 0;
1495 packet->ohdr = packet->ebuf;
1496 packet->grh = NULL;
1497 } else if (l4 == OPA_16B_L4_IB_GLOBAL) {
1498 u32 vtf;
1499
1500 grh_len = sizeof(struct ib_grh);
1501 packet->ohdr = packet->ebuf + grh_len;
1502 packet->grh = packet->ebuf;
1503 if (packet->grh->next_hdr != IB_GRH_NEXT_HDR)
1504 goto drop;
1505 vtf = be32_to_cpu(packet->grh->version_tclass_flow);
1506 if ((vtf >> IB_GRH_VERSION_SHIFT) != IB_GRH_VERSION)
1507 goto drop;
1508 } else {
1509 goto drop;
1510 }
1511
1512 /* Query commonly used fields from packet header */
1513 packet->opcode = ib_bth_get_opcode(packet->ohdr);
1514 /* hdr_len_by_opcode already has an IB LRH factored in */
1515 packet->hlen = hdr_len_by_opcode[packet->opcode] +
1516 (LRH_16B_BYTES - LRH_9B_BYTES) + grh_len;
1517 packet->payload = packet->ebuf + packet->hlen - LRH_16B_BYTES;
1518 packet->slid = hfi1_16B_get_slid(packet->hdr);
1519 packet->dlid = hfi1_16B_get_dlid(packet->hdr);
1520 if (unlikely(hfi1_is_16B_mcast(packet->dlid)))
1521 packet->dlid += opa_get_mcast_base(OPA_MCAST_NR) -
1522 opa_get_lid(opa_get_mcast_base(OPA_MCAST_NR),
1523 16B);
1524 packet->sc = hfi1_16B_get_sc(packet->hdr);
1525 packet->sl = ibp->sc_to_sl[packet->sc];
1526 packet->pad = hfi1_16B_bth_get_pad(packet->ohdr);
1527 packet->extra_byte = SIZE_OF_LT;
1528 packet->pkey = hfi1_16B_get_pkey(packet->hdr);
1529 packet->migrated = opa_bth_is_migration(packet->ohdr);
1530
1531 if (hfi1_bypass_ingress_pkt_check(packet))
1532 goto drop;
1533
1534 return 0;
1535drop:
1536 hfi1_cdbg(PKT, "%s: packet dropped\n", __func__);
1537 ibp->rvp.n_pkt_drops++;
1538 return -EINVAL;
1539}
1540
1541void handle_eflags(struct hfi1_packet *packet)
1542{
1543 struct hfi1_ctxtdata *rcd = packet->rcd;
1544 u32 rte = rhf_rcv_type_err(packet->rhf);
1545
1546 rcv_hdrerr(rcd, rcd->ppd, packet);
1547 if (rhf_err_flags(packet->rhf))
1548 dd_dev_err(rcd->dd,
1549 "receive context %d: rhf 0x%016llx, errs [ %s%s%s%s%s%s%s%s] rte 0x%x\n",
1550 rcd->ctxt, packet->rhf,
1551 packet->rhf & RHF_K_HDR_LEN_ERR ? "k_hdr_len " : "",
1552 packet->rhf & RHF_DC_UNC_ERR ? "dc_unc " : "",
1553 packet->rhf & RHF_DC_ERR ? "dc " : "",
1554 packet->rhf & RHF_TID_ERR ? "tid " : "",
1555 packet->rhf & RHF_LEN_ERR ? "len " : "",
1556 packet->rhf & RHF_ECC_ERR ? "ecc " : "",
1557 packet->rhf & RHF_VCRC_ERR ? "vcrc " : "",
1558 packet->rhf & RHF_ICRC_ERR ? "icrc " : "",
1559 rte);
1560}
1561
1562/*
1563 * The following functions are called by the interrupt handler. They are type
1564 * specific handlers for each packet type.
1565 */
1566int process_receive_ib(struct hfi1_packet *packet)
1567{
1568 if (unlikely(hfi1_dbg_fault_packet(packet)))
1569 return RHF_RCV_CONTINUE;
1570
1571 if (hfi1_setup_9B_packet(packet))
1572 return RHF_RCV_CONTINUE;
1573
1574 trace_hfi1_rcvhdr(packet);
1575
1576 if (unlikely(rhf_err_flags(packet->rhf))) {
1577 handle_eflags(packet);
1578 return RHF_RCV_CONTINUE;
1579 }
1580
1581 hfi1_ib_rcv(packet);
1582 return RHF_RCV_CONTINUE;
1583}
1584
1585static inline bool hfi1_is_vnic_packet(struct hfi1_packet *packet)
1586{
1587 /* Packet received in VNIC context via RSM */
1588 if (packet->rcd->is_vnic)
1589 return true;
1590
1591 if ((hfi1_16B_get_l2(packet->ebuf) == OPA_16B_L2_TYPE) &&
1592 (hfi1_16B_get_l4(packet->ebuf) == OPA_16B_L4_ETHR))
1593 return true;
1594
1595 return false;
1596}
1597
1598int process_receive_bypass(struct hfi1_packet *packet)
1599{
1600 struct hfi1_devdata *dd = packet->rcd->dd;
1601
1602 if (hfi1_is_vnic_packet(packet)) {
1603 hfi1_vnic_bypass_rcv(packet);
1604 return RHF_RCV_CONTINUE;
1605 }
1606
1607 if (hfi1_setup_bypass_packet(packet))
1608 return RHF_RCV_CONTINUE;
1609
1610 trace_hfi1_rcvhdr(packet);
1611
1612 if (unlikely(rhf_err_flags(packet->rhf))) {
1613 handle_eflags(packet);
1614 return RHF_RCV_CONTINUE;
1615 }
1616
1617 if (hfi1_16B_get_l2(packet->hdr) == 0x2) {
1618 hfi1_16B_rcv(packet);
1619 } else {
1620 dd_dev_err(dd,
1621 "Bypass packets other than 16B are not supported in normal operation. Dropping\n");
1622 incr_cntr64(&dd->sw_rcv_bypass_packet_errors);
1623 if (!(dd->err_info_rcvport.status_and_code &
1624 OPA_EI_STATUS_SMASK)) {
1625 u64 *flits = packet->ebuf;
1626
1627 if (flits && !(packet->rhf & RHF_LEN_ERR)) {
1628 dd->err_info_rcvport.packet_flit1 = flits[0];
1629 dd->err_info_rcvport.packet_flit2 =
1630 packet->tlen > sizeof(flits[0]) ?
1631 flits[1] : 0;
1632 }
1633 dd->err_info_rcvport.status_and_code |=
1634 (OPA_EI_STATUS_SMASK | BAD_L2_ERR);
1635 }
1636 }
1637 return RHF_RCV_CONTINUE;
1638}
1639
1640int process_receive_error(struct hfi1_packet *packet)
1641{
1642 /* KHdrHCRCErr -- KDETH packet with a bad HCRC */
1643 if (unlikely(
1644 hfi1_dbg_fault_suppress_err(&packet->rcd->dd->verbs_dev) &&
1645 rhf_rcv_type_err(packet->rhf) == 3))
1646 return RHF_RCV_CONTINUE;
1647
1648 hfi1_setup_ib_header(packet);
1649 handle_eflags(packet);
1650
1651 if (unlikely(rhf_err_flags(packet->rhf)))
1652 dd_dev_err(packet->rcd->dd,
1653 "Unhandled error packet received. Dropping.\n");
1654
1655 return RHF_RCV_CONTINUE;
1656}
1657
1658int kdeth_process_expected(struct hfi1_packet *packet)
1659{
1660 if (unlikely(hfi1_dbg_fault_packet(packet)))
1661 return RHF_RCV_CONTINUE;
1662
1663 hfi1_setup_ib_header(packet);
1664 if (unlikely(rhf_err_flags(packet->rhf)))
1665 handle_eflags(packet);
1666
1667 dd_dev_err(packet->rcd->dd,
1668 "Unhandled expected packet received. Dropping.\n");
1669 return RHF_RCV_CONTINUE;
1670}
1671
1672int kdeth_process_eager(struct hfi1_packet *packet)
1673{
1674 hfi1_setup_ib_header(packet);
1675 if (unlikely(rhf_err_flags(packet->rhf)))
1676 handle_eflags(packet);
1677 if (unlikely(hfi1_dbg_fault_packet(packet)))
1678 return RHF_RCV_CONTINUE;
1679
1680 dd_dev_err(packet->rcd->dd,
1681 "Unhandled eager packet received. Dropping.\n");
1682 return RHF_RCV_CONTINUE;
1683}
1684
1685int process_receive_invalid(struct hfi1_packet *packet)
1686{
1687 dd_dev_err(packet->rcd->dd, "Invalid packet type %d. Dropping\n",
1688 rhf_rcv_type(packet->rhf));
1689 return RHF_RCV_CONTINUE;
1690}
1691
1692void seqfile_dump_rcd(struct seq_file *s, struct hfi1_ctxtdata *rcd)
1693{
1694 struct hfi1_packet packet;
1695 struct ps_mdata mdata;
1696
1697 seq_printf(s, "Rcd %u: RcvHdr cnt %u entsize %u %s head %llu tail %llu\n",
1698 rcd->ctxt, rcd->rcvhdrq_cnt, rcd->rcvhdrqentsize,
1699 HFI1_CAP_KGET_MASK(rcd->flags, DMA_RTAIL) ?
1700 "dma_rtail" : "nodma_rtail",
1701 read_uctxt_csr(rcd->dd, rcd->ctxt, RCV_HDR_HEAD) &
1702 RCV_HDR_HEAD_HEAD_MASK,
1703 read_uctxt_csr(rcd->dd, rcd->ctxt, RCV_HDR_TAIL));
1704
1705 init_packet(rcd, &packet);
1706 init_ps_mdata(&mdata, &packet);
1707
1708 while (1) {
1709 struct hfi1_devdata *dd = rcd->dd;
1710 __le32 *rhf_addr = (__le32 *)rcd->rcvhdrq + mdata.ps_head +
1711 dd->rhf_offset;
1712 struct ib_header *hdr;
1713 u64 rhf = rhf_to_cpu(rhf_addr);
1714 u32 etype = rhf_rcv_type(rhf), qpn;
1715 u8 opcode;
1716 u32 psn;
1717 u8 lnh;
1718
1719 if (ps_done(&mdata, rhf, rcd))
1720 break;
1721
1722 if (ps_skip(&mdata, rhf, rcd))
1723 goto next;
1724
1725 if (etype > RHF_RCV_TYPE_IB)
1726 goto next;
1727
1728 packet.hdr = hfi1_get_msgheader(dd, rhf_addr);
1729 hdr = packet.hdr;
1730
1731 lnh = be16_to_cpu(hdr->lrh[0]) & 3;
1732
1733 if (lnh == HFI1_LRH_BTH)
1734 packet.ohdr = &hdr->u.oth;
1735 else if (lnh == HFI1_LRH_GRH)
1736 packet.ohdr = &hdr->u.l.oth;
1737 else
1738 goto next; /* just in case */
1739
1740 opcode = (be32_to_cpu(packet.ohdr->bth[0]) >> 24);
1741 qpn = be32_to_cpu(packet.ohdr->bth[1]) & RVT_QPN_MASK;
1742 psn = mask_psn(be32_to_cpu(packet.ohdr->bth[2]));
1743
1744 seq_printf(s, "\tEnt %u: opcode 0x%x, qpn 0x%x, psn 0x%x\n",
1745 mdata.ps_head, opcode, qpn, psn);
1746next:
1747 update_ps_mdata(&mdata, rcd);
1748 }
1749}