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77241056 | 1 | /* |
05d6ac1d | 2 | * Copyright(c) 2015, 2016 Intel Corporation. |
77241056 MM |
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 | * | |
77241056 MM |
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 | * | |
77241056 MM |
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> | |
8859b4a6 | 56 | #include <rdma/ib_verbs.h> |
77241056 MM |
57 | |
58 | #include "hfi.h" | |
59 | #include "trace.h" | |
60 | #include "qp.h" | |
61 | #include "sdma.h" | |
62 | ||
63 | #undef pr_fmt | |
64 | #define pr_fmt(fmt) DRIVER_NAME ": " fmt | |
65 | ||
66 | /* | |
67 | * The size has to be longer than this string, so we can append | |
68 | * board/chip information to it in the initialization code. | |
69 | */ | |
70 | const char ib_hfi1_version[] = HFI1_DRIVER_VERSION "\n"; | |
71 | ||
72 | DEFINE_SPINLOCK(hfi1_devs_lock); | |
73 | LIST_HEAD(hfi1_dev_list); | |
74 | DEFINE_MUTEX(hfi1_mutex); /* general driver use */ | |
75 | ||
76 | unsigned int hfi1_max_mtu = HFI1_DEFAULT_MAX_MTU; | |
77 | module_param_named(max_mtu, hfi1_max_mtu, uint, S_IRUGO); | |
78 | MODULE_PARM_DESC(max_mtu, "Set max MTU bytes, default is 8192"); | |
79 | ||
80 | unsigned int hfi1_cu = 1; | |
81 | module_param_named(cu, hfi1_cu, uint, S_IRUGO); | |
82 | MODULE_PARM_DESC(cu, "Credit return units"); | |
83 | ||
84 | unsigned long hfi1_cap_mask = HFI1_CAP_MASK_DEFAULT; | |
85 | static int hfi1_caps_set(const char *, const struct kernel_param *); | |
86 | static int hfi1_caps_get(char *, const struct kernel_param *); | |
87 | static const struct kernel_param_ops cap_ops = { | |
88 | .set = hfi1_caps_set, | |
89 | .get = hfi1_caps_get | |
90 | }; | |
91 | module_param_cb(cap_mask, &cap_ops, &hfi1_cap_mask, S_IWUSR | S_IRUGO); | |
92 | MODULE_PARM_DESC(cap_mask, "Bit mask of enabled/disabled HW features"); | |
93 | ||
94 | MODULE_LICENSE("Dual BSD/GPL"); | |
95 | MODULE_DESCRIPTION("Intel Omni-Path Architecture driver"); | |
96 | MODULE_VERSION(HFI1_DRIVER_VERSION); | |
97 | ||
98 | /* | |
99 | * MAX_PKT_RCV is the max # if packets processed per receive interrupt. | |
100 | */ | |
101 | #define MAX_PKT_RECV 64 | |
102 | #define EGR_HEAD_UPDATE_THRESHOLD 16 | |
103 | ||
104 | struct hfi1_ib_stats hfi1_stats; | |
105 | ||
106 | static int hfi1_caps_set(const char *val, const struct kernel_param *kp) | |
107 | { | |
108 | int ret = 0; | |
109 | unsigned long *cap_mask_ptr = (unsigned long *)kp->arg, | |
110 | cap_mask = *cap_mask_ptr, value, diff, | |
111 | write_mask = ((HFI1_CAP_WRITABLE_MASK << HFI1_CAP_USER_SHIFT) | | |
112 | HFI1_CAP_WRITABLE_MASK); | |
113 | ||
114 | ret = kstrtoul(val, 0, &value); | |
115 | if (ret) { | |
116 | pr_warn("Invalid module parameter value for 'cap_mask'\n"); | |
117 | goto done; | |
118 | } | |
119 | /* Get the changed bits (except the locked bit) */ | |
120 | diff = value ^ (cap_mask & ~HFI1_CAP_LOCKED_SMASK); | |
121 | ||
122 | /* Remove any bits that are not allowed to change after driver load */ | |
123 | if (HFI1_CAP_LOCKED() && (diff & ~write_mask)) { | |
124 | pr_warn("Ignoring non-writable capability bits %#lx\n", | |
125 | diff & ~write_mask); | |
126 | diff &= write_mask; | |
127 | } | |
128 | ||
129 | /* Mask off any reserved bits */ | |
130 | diff &= ~HFI1_CAP_RESERVED_MASK; | |
131 | /* Clear any previously set and changing bits */ | |
132 | cap_mask &= ~diff; | |
133 | /* Update the bits with the new capability */ | |
134 | cap_mask |= (value & diff); | |
135 | /* Check for any kernel/user restrictions */ | |
136 | diff = (cap_mask & (HFI1_CAP_MUST_HAVE_KERN << HFI1_CAP_USER_SHIFT)) ^ | |
137 | ((cap_mask & HFI1_CAP_MUST_HAVE_KERN) << HFI1_CAP_USER_SHIFT); | |
138 | cap_mask &= ~diff; | |
139 | /* Set the bitmask to the final set */ | |
140 | *cap_mask_ptr = cap_mask; | |
141 | done: | |
142 | return ret; | |
143 | } | |
144 | ||
145 | static int hfi1_caps_get(char *buffer, const struct kernel_param *kp) | |
146 | { | |
147 | unsigned long cap_mask = *(unsigned long *)kp->arg; | |
148 | ||
149 | cap_mask &= ~HFI1_CAP_LOCKED_SMASK; | |
150 | cap_mask |= ((cap_mask & HFI1_CAP_K2U) << HFI1_CAP_USER_SHIFT); | |
151 | ||
152 | return scnprintf(buffer, PAGE_SIZE, "0x%lx", cap_mask); | |
153 | } | |
154 | ||
155 | const char *get_unit_name(int unit) | |
156 | { | |
157 | static char iname[16]; | |
158 | ||
9805071e | 159 | snprintf(iname, sizeof(iname), DRIVER_NAME "_%u", unit); |
77241056 MM |
160 | return iname; |
161 | } | |
162 | ||
49dbb6cf DD |
163 | const char *get_card_name(struct rvt_dev_info *rdi) |
164 | { | |
165 | struct hfi1_ibdev *ibdev = container_of(rdi, struct hfi1_ibdev, rdi); | |
166 | struct hfi1_devdata *dd = container_of(ibdev, | |
167 | struct hfi1_devdata, verbs_dev); | |
168 | return get_unit_name(dd->unit); | |
169 | } | |
170 | ||
171 | struct pci_dev *get_pci_dev(struct rvt_dev_info *rdi) | |
172 | { | |
173 | struct hfi1_ibdev *ibdev = container_of(rdi, struct hfi1_ibdev, rdi); | |
174 | struct hfi1_devdata *dd = container_of(ibdev, | |
175 | struct hfi1_devdata, verbs_dev); | |
176 | return dd->pcidev; | |
177 | } | |
178 | ||
77241056 MM |
179 | /* |
180 | * Return count of units with at least one port ACTIVE. | |
181 | */ | |
182 | int hfi1_count_active_units(void) | |
183 | { | |
184 | struct hfi1_devdata *dd; | |
185 | struct hfi1_pportdata *ppd; | |
186 | unsigned long flags; | |
187 | int pidx, nunits_active = 0; | |
188 | ||
189 | spin_lock_irqsave(&hfi1_devs_lock, flags); | |
190 | list_for_each_entry(dd, &hfi1_dev_list, list) { | |
191 | if (!(dd->flags & HFI1_PRESENT) || !dd->kregbase) | |
192 | continue; | |
193 | for (pidx = 0; pidx < dd->num_pports; ++pidx) { | |
194 | ppd = dd->pport + pidx; | |
195 | if (ppd->lid && ppd->linkup) { | |
196 | nunits_active++; | |
197 | break; | |
198 | } | |
199 | } | |
200 | } | |
201 | spin_unlock_irqrestore(&hfi1_devs_lock, flags); | |
202 | return nunits_active; | |
203 | } | |
204 | ||
205 | /* | |
206 | * Return count of all units, optionally return in arguments | |
207 | * the number of usable (present) units, and the number of | |
208 | * ports that are up. | |
209 | */ | |
210 | int hfi1_count_units(int *npresentp, int *nupp) | |
211 | { | |
212 | int nunits = 0, npresent = 0, nup = 0; | |
213 | struct hfi1_devdata *dd; | |
214 | unsigned long flags; | |
215 | int pidx; | |
216 | struct hfi1_pportdata *ppd; | |
217 | ||
218 | spin_lock_irqsave(&hfi1_devs_lock, flags); | |
219 | ||
220 | list_for_each_entry(dd, &hfi1_dev_list, list) { | |
221 | nunits++; | |
222 | if ((dd->flags & HFI1_PRESENT) && dd->kregbase) | |
223 | npresent++; | |
224 | for (pidx = 0; pidx < dd->num_pports; ++pidx) { | |
225 | ppd = dd->pport + pidx; | |
226 | if (ppd->lid && ppd->linkup) | |
227 | nup++; | |
228 | } | |
229 | } | |
230 | ||
231 | spin_unlock_irqrestore(&hfi1_devs_lock, flags); | |
232 | ||
233 | if (npresentp) | |
234 | *npresentp = npresent; | |
235 | if (nupp) | |
236 | *nupp = nup; | |
237 | ||
238 | return nunits; | |
239 | } | |
240 | ||
241 | /* | |
242 | * Get address of eager buffer from it's index (allocated in chunks, not | |
243 | * contiguous). | |
244 | */ | |
245 | static inline void *get_egrbuf(const struct hfi1_ctxtdata *rcd, u64 rhf, | |
246 | u8 *update) | |
247 | { | |
248 | u32 idx = rhf_egr_index(rhf), offset = rhf_egr_buf_offset(rhf); | |
249 | ||
250 | *update |= !(idx & (rcd->egrbufs.threshold - 1)) && !offset; | |
251 | return (void *)(((u64)(rcd->egrbufs.rcvtids[idx].addr)) + | |
252 | (offset * RCV_BUF_BLOCK_SIZE)); | |
253 | } | |
254 | ||
255 | /* | |
256 | * Validate and encode the a given RcvArray Buffer size. | |
257 | * The function will check whether the given size falls within | |
258 | * allowed size ranges for the respective type and, optionally, | |
259 | * return the proper encoding. | |
260 | */ | |
261 | inline int hfi1_rcvbuf_validate(u32 size, u8 type, u16 *encoded) | |
262 | { | |
263 | if (unlikely(!IS_ALIGNED(size, PAGE_SIZE))) | |
264 | return 0; | |
265 | if (unlikely(size < MIN_EAGER_BUFFER)) | |
266 | return 0; | |
267 | if (size > | |
268 | (type == PT_EAGER ? MAX_EAGER_BUFFER : MAX_EXPECTED_BUFFER)) | |
269 | return 0; | |
270 | if (encoded) | |
271 | *encoded = ilog2(size / PAGE_SIZE) + 1; | |
272 | return 1; | |
273 | } | |
274 | ||
275 | static void rcv_hdrerr(struct hfi1_ctxtdata *rcd, struct hfi1_pportdata *ppd, | |
276 | struct hfi1_packet *packet) | |
277 | { | |
278 | struct hfi1_message_header *rhdr = packet->hdr; | |
279 | u32 rte = rhf_rcv_type_err(packet->rhf); | |
280 | int lnh = be16_to_cpu(rhdr->lrh[0]) & 3; | |
281 | struct hfi1_ibport *ibp = &ppd->ibport_data; | |
ec4274f1 DD |
282 | struct hfi1_devdata *dd = ppd->dd; |
283 | struct rvt_dev_info *rdi = &dd->verbs_dev.rdi; | |
77241056 MM |
284 | |
285 | if (packet->rhf & (RHF_VCRC_ERR | RHF_ICRC_ERR)) | |
286 | return; | |
287 | ||
288 | if (packet->rhf & RHF_TID_ERR) { | |
289 | /* For TIDERR and RC QPs preemptively schedule a NAK */ | |
290 | struct hfi1_ib_header *hdr = (struct hfi1_ib_header *)rhdr; | |
291 | struct hfi1_other_headers *ohdr = NULL; | |
292 | u32 tlen = rhf_pkt_len(packet->rhf); /* in bytes */ | |
293 | u16 lid = be16_to_cpu(hdr->lrh[1]); | |
294 | u32 qp_num; | |
295 | u32 rcv_flags = 0; | |
296 | ||
297 | /* Sanity check packet */ | |
298 | if (tlen < 24) | |
299 | goto drop; | |
300 | ||
301 | /* Check for GRH */ | |
e490974e | 302 | if (lnh == HFI1_LRH_BTH) { |
77241056 | 303 | ohdr = &hdr->u.oth; |
e490974e | 304 | } else if (lnh == HFI1_LRH_GRH) { |
77241056 MM |
305 | u32 vtf; |
306 | ||
307 | ohdr = &hdr->u.l.oth; | |
308 | if (hdr->u.l.grh.next_hdr != IB_GRH_NEXT_HDR) | |
309 | goto drop; | |
310 | vtf = be32_to_cpu(hdr->u.l.grh.version_tclass_flow); | |
311 | if ((vtf >> IB_GRH_VERSION_SHIFT) != IB_GRH_VERSION) | |
312 | goto drop; | |
313 | rcv_flags |= HFI1_HAS_GRH; | |
e490974e | 314 | } else { |
77241056 | 315 | goto drop; |
e490974e | 316 | } |
77241056 | 317 | /* Get the destination QP number. */ |
ec4274f1 | 318 | qp_num = be32_to_cpu(ohdr->bth[1]) & RVT_QPN_MASK; |
8859b4a6 | 319 | if (lid < be16_to_cpu(IB_MULTICAST_LID_BASE)) { |
895420dd | 320 | struct rvt_qp *qp; |
b77d713a | 321 | unsigned long flags; |
77241056 MM |
322 | |
323 | rcu_read_lock(); | |
ec4274f1 | 324 | qp = rvt_lookup_qpn(rdi, &ibp->rvp, qp_num); |
77241056 MM |
325 | if (!qp) { |
326 | rcu_read_unlock(); | |
327 | goto drop; | |
328 | } | |
329 | ||
330 | /* | |
331 | * Handle only RC QPs - for other QP types drop error | |
332 | * packet. | |
333 | */ | |
b77d713a | 334 | spin_lock_irqsave(&qp->r_lock, flags); |
77241056 MM |
335 | |
336 | /* Check for valid receive state. */ | |
83693bd1 DD |
337 | if (!(ib_rvt_state_ops[qp->state] & |
338 | RVT_PROCESS_RECV_OK)) { | |
4eb06882 | 339 | ibp->rvp.n_pkt_drops++; |
77241056 MM |
340 | } |
341 | ||
342 | switch (qp->ibqp.qp_type) { | |
343 | case IB_QPT_RC: | |
344 | hfi1_rc_hdrerr( | |
345 | rcd, | |
346 | hdr, | |
347 | rcv_flags, | |
348 | qp); | |
349 | break; | |
350 | default: | |
351 | /* For now don't handle any other QP types */ | |
352 | break; | |
353 | } | |
354 | ||
b77d713a | 355 | spin_unlock_irqrestore(&qp->r_lock, flags); |
77241056 MM |
356 | rcu_read_unlock(); |
357 | } /* Unicast QP */ | |
358 | } /* Valid packet with TIDErr */ | |
359 | ||
360 | /* handle "RcvTypeErr" flags */ | |
361 | switch (rte) { | |
362 | case RHF_RTE_ERROR_OP_CODE_ERR: | |
363 | { | |
364 | u32 opcode; | |
365 | void *ebuf = NULL; | |
366 | __be32 *bth = NULL; | |
367 | ||
368 | if (rhf_use_egr_bfr(packet->rhf)) | |
369 | ebuf = packet->ebuf; | |
370 | ||
d125a6c6 | 371 | if (!ebuf) |
77241056 MM |
372 | goto drop; /* this should never happen */ |
373 | ||
374 | if (lnh == HFI1_LRH_BTH) | |
375 | bth = (__be32 *)ebuf; | |
376 | else if (lnh == HFI1_LRH_GRH) | |
377 | bth = (__be32 *)((char *)ebuf + sizeof(struct ib_grh)); | |
378 | else | |
379 | goto drop; | |
380 | ||
381 | opcode = be32_to_cpu(bth[0]) >> 24; | |
382 | opcode &= 0xff; | |
383 | ||
384 | if (opcode == IB_OPCODE_CNP) { | |
385 | /* | |
386 | * Only in pre-B0 h/w is the CNP_OPCODE handled | |
624be1db | 387 | * via this code path. |
77241056 | 388 | */ |
895420dd | 389 | struct rvt_qp *qp = NULL; |
77241056 MM |
390 | u32 lqpn, rqpn; |
391 | u16 rlid; | |
392 | u8 svc_type, sl, sc5; | |
393 | ||
394 | sc5 = (be16_to_cpu(rhdr->lrh[0]) >> 12) & 0xf; | |
395 | if (rhf_dc_info(packet->rhf)) | |
396 | sc5 |= 0x10; | |
397 | sl = ibp->sc_to_sl[sc5]; | |
398 | ||
ec4274f1 | 399 | lqpn = be32_to_cpu(bth[1]) & RVT_QPN_MASK; |
77241056 | 400 | rcu_read_lock(); |
ec4274f1 | 401 | qp = rvt_lookup_qpn(rdi, &ibp->rvp, lqpn); |
d125a6c6 | 402 | if (!qp) { |
77241056 MM |
403 | rcu_read_unlock(); |
404 | goto drop; | |
405 | } | |
406 | ||
407 | switch (qp->ibqp.qp_type) { | |
408 | case IB_QPT_UD: | |
409 | rlid = 0; | |
410 | rqpn = 0; | |
411 | svc_type = IB_CC_SVCTYPE_UD; | |
412 | break; | |
413 | case IB_QPT_UC: | |
414 | rlid = be16_to_cpu(rhdr->lrh[3]); | |
415 | rqpn = qp->remote_qpn; | |
416 | svc_type = IB_CC_SVCTYPE_UC; | |
417 | break; | |
418 | default: | |
419 | goto drop; | |
420 | } | |
421 | ||
422 | process_becn(ppd, sl, rlid, lqpn, rqpn, svc_type); | |
423 | rcu_read_unlock(); | |
424 | } | |
425 | ||
426 | packet->rhf &= ~RHF_RCV_TYPE_ERR_SMASK; | |
427 | break; | |
428 | } | |
429 | default: | |
430 | break; | |
431 | } | |
432 | ||
433 | drop: | |
434 | return; | |
435 | } | |
436 | ||
437 | static inline void init_packet(struct hfi1_ctxtdata *rcd, | |
17fb4f29 | 438 | struct hfi1_packet *packet) |
77241056 | 439 | { |
77241056 MM |
440 | packet->rsize = rcd->rcvhdrqentsize; /* words */ |
441 | packet->maxcnt = rcd->rcvhdrq_cnt * packet->rsize; /* words */ | |
442 | packet->rcd = rcd; | |
443 | packet->updegr = 0; | |
444 | packet->etail = -1; | |
f4f30031 | 445 | packet->rhf_addr = get_rhf_addr(rcd); |
77241056 MM |
446 | packet->rhf = rhf_to_cpu(packet->rhf_addr); |
447 | packet->rhqoff = rcd->head; | |
448 | packet->numpkt = 0; | |
449 | packet->rcv_flags = 0; | |
450 | } | |
451 | ||
895420dd | 452 | static void process_ecn(struct rvt_qp *qp, struct hfi1_ib_header *hdr, |
77241056 | 453 | struct hfi1_other_headers *ohdr, |
977940b8 | 454 | u64 rhf, u32 bth1, struct ib_grh *grh) |
77241056 MM |
455 | { |
456 | struct hfi1_ibport *ibp = to_iport(qp->ibqp.device, qp->port_num); | |
977940b8 AK |
457 | u32 rqpn = 0; |
458 | u16 rlid; | |
77241056 | 459 | u8 sc5, svc_type; |
77241056 MM |
460 | |
461 | switch (qp->ibqp.qp_type) { | |
977940b8 AK |
462 | case IB_QPT_SMI: |
463 | case IB_QPT_GSI: | |
77241056 | 464 | case IB_QPT_UD: |
977940b8 | 465 | rlid = be16_to_cpu(hdr->lrh[3]); |
ec4274f1 | 466 | rqpn = be32_to_cpu(ohdr->u.ud.deth[1]) & RVT_QPN_MASK; |
77241056 MM |
467 | svc_type = IB_CC_SVCTYPE_UD; |
468 | break; | |
977940b8 AK |
469 | case IB_QPT_UC: |
470 | rlid = qp->remote_ah_attr.dlid; | |
471 | rqpn = qp->remote_qpn; | |
472 | svc_type = IB_CC_SVCTYPE_UC; | |
473 | break; | |
474 | case IB_QPT_RC: | |
475 | rlid = qp->remote_ah_attr.dlid; | |
476 | rqpn = qp->remote_qpn; | |
477 | svc_type = IB_CC_SVCTYPE_RC; | |
478 | break; | |
77241056 MM |
479 | default: |
480 | return; | |
481 | } | |
482 | ||
77241056 MM |
483 | sc5 = (be16_to_cpu(hdr->lrh[0]) >> 12) & 0xf; |
484 | if (rhf_dc_info(rhf)) | |
485 | sc5 |= 0x10; | |
486 | ||
977940b8 | 487 | if (bth1 & HFI1_FECN_SMASK) { |
77241056 MM |
488 | u16 pkey = (u16)be32_to_cpu(ohdr->bth[0]); |
489 | u16 dlid = be16_to_cpu(hdr->lrh[1]); | |
77241056 | 490 | |
977940b8 | 491 | return_cnp(ibp, qp, rqpn, pkey, dlid, rlid, sc5, grh); |
77241056 MM |
492 | } |
493 | ||
977940b8 | 494 | if (bth1 & HFI1_BECN_SMASK) { |
77241056 | 495 | struct hfi1_pportdata *ppd = ppd_from_ibp(ibp); |
ec4274f1 | 496 | u32 lqpn = bth1 & RVT_QPN_MASK; |
77241056 MM |
497 | u8 sl = ibp->sc_to_sl[sc5]; |
498 | ||
977940b8 | 499 | process_becn(ppd, sl, rlid, lqpn, rqpn, svc_type); |
77241056 | 500 | } |
77241056 MM |
501 | } |
502 | ||
503 | struct ps_mdata { | |
504 | struct hfi1_ctxtdata *rcd; | |
505 | u32 rsize; | |
506 | u32 maxcnt; | |
507 | u32 ps_head; | |
508 | u32 ps_tail; | |
509 | u32 ps_seq; | |
510 | }; | |
511 | ||
512 | static inline void init_ps_mdata(struct ps_mdata *mdata, | |
513 | struct hfi1_packet *packet) | |
514 | { | |
515 | struct hfi1_ctxtdata *rcd = packet->rcd; | |
516 | ||
517 | mdata->rcd = rcd; | |
518 | mdata->rsize = packet->rsize; | |
519 | mdata->maxcnt = packet->maxcnt; | |
3e7ccca0 | 520 | mdata->ps_head = packet->rhqoff; |
77241056 | 521 | |
82c2611d | 522 | if (HFI1_CAP_KGET_MASK(rcd->flags, DMA_RTAIL)) { |
3e7ccca0 | 523 | mdata->ps_tail = get_rcvhdrtail(rcd); |
82c2611d NV |
524 | if (rcd->ctxt == HFI1_CTRL_CTXT) |
525 | mdata->ps_seq = rcd->seq_cnt; | |
526 | else | |
527 | mdata->ps_seq = 0; /* not used with DMA_RTAIL */ | |
77241056 MM |
528 | } else { |
529 | mdata->ps_tail = 0; /* used only with DMA_RTAIL*/ | |
530 | mdata->ps_seq = rcd->seq_cnt; | |
531 | } | |
532 | } | |
533 | ||
82c2611d NV |
534 | static inline int ps_done(struct ps_mdata *mdata, u64 rhf, |
535 | struct hfi1_ctxtdata *rcd) | |
77241056 | 536 | { |
82c2611d | 537 | if (HFI1_CAP_KGET_MASK(rcd->flags, DMA_RTAIL)) |
77241056 MM |
538 | return mdata->ps_head == mdata->ps_tail; |
539 | return mdata->ps_seq != rhf_rcv_seq(rhf); | |
540 | } | |
541 | ||
82c2611d NV |
542 | static inline int ps_skip(struct ps_mdata *mdata, u64 rhf, |
543 | struct hfi1_ctxtdata *rcd) | |
544 | { | |
545 | /* | |
546 | * Control context can potentially receive an invalid rhf. | |
547 | * Drop such packets. | |
548 | */ | |
549 | if ((rcd->ctxt == HFI1_CTRL_CTXT) && (mdata->ps_head != mdata->ps_tail)) | |
550 | return mdata->ps_seq != rhf_rcv_seq(rhf); | |
551 | ||
552 | return 0; | |
553 | } | |
554 | ||
555 | static inline void update_ps_mdata(struct ps_mdata *mdata, | |
556 | struct hfi1_ctxtdata *rcd) | |
77241056 | 557 | { |
77241056 | 558 | mdata->ps_head += mdata->rsize; |
3e7ccca0 | 559 | if (mdata->ps_head >= mdata->maxcnt) |
77241056 | 560 | mdata->ps_head = 0; |
82c2611d NV |
561 | |
562 | /* Control context must do seq counting */ | |
563 | if (!HFI1_CAP_KGET_MASK(rcd->flags, DMA_RTAIL) || | |
564 | (rcd->ctxt == HFI1_CTRL_CTXT)) { | |
77241056 MM |
565 | if (++mdata->ps_seq > 13) |
566 | mdata->ps_seq = 1; | |
567 | } | |
568 | } | |
569 | ||
570 | /* | |
571 | * prescan_rxq - search through the receive queue looking for packets | |
572 | * containing Excplicit Congestion Notifications (FECNs, or BECNs). | |
573 | * When an ECN is found, process the Congestion Notification, and toggle | |
574 | * it off. | |
6c9e50f8 VM |
575 | * This is declared as a macro to allow quick checking of the port to avoid |
576 | * the overhead of a function call if not enabled. | |
77241056 | 577 | */ |
6c9e50f8 VM |
578 | #define prescan_rxq(rcd, packet) \ |
579 | do { \ | |
580 | if (rcd->ppd->cc_prescan) \ | |
581 | __prescan_rxq(packet); \ | |
582 | } while (0) | |
583 | static void __prescan_rxq(struct hfi1_packet *packet) | |
77241056 MM |
584 | { |
585 | struct hfi1_ctxtdata *rcd = packet->rcd; | |
586 | struct ps_mdata mdata; | |
587 | ||
77241056 MM |
588 | init_ps_mdata(&mdata, packet); |
589 | ||
590 | while (1) { | |
591 | struct hfi1_devdata *dd = rcd->dd; | |
592 | struct hfi1_ibport *ibp = &rcd->ppd->ibport_data; | |
50e5dcbe | 593 | __le32 *rhf_addr = (__le32 *)rcd->rcvhdrq + mdata.ps_head + |
77241056 | 594 | dd->rhf_offset; |
895420dd | 595 | struct rvt_qp *qp; |
77241056 MM |
596 | struct hfi1_ib_header *hdr; |
597 | struct hfi1_other_headers *ohdr; | |
598 | struct ib_grh *grh = NULL; | |
ec4274f1 | 599 | struct rvt_dev_info *rdi = &dd->verbs_dev.rdi; |
77241056 | 600 | u64 rhf = rhf_to_cpu(rhf_addr); |
977940b8 | 601 | u32 etype = rhf_rcv_type(rhf), qpn, bth1; |
77241056 MM |
602 | int is_ecn = 0; |
603 | u8 lnh; | |
604 | ||
82c2611d | 605 | if (ps_done(&mdata, rhf, rcd)) |
77241056 MM |
606 | break; |
607 | ||
82c2611d NV |
608 | if (ps_skip(&mdata, rhf, rcd)) |
609 | goto next; | |
610 | ||
77241056 MM |
611 | if (etype != RHF_RCV_TYPE_IB) |
612 | goto next; | |
613 | ||
614 | hdr = (struct hfi1_ib_header *) | |
615 | hfi1_get_msgheader(dd, rhf_addr); | |
616 | lnh = be16_to_cpu(hdr->lrh[0]) & 3; | |
617 | ||
e490974e | 618 | if (lnh == HFI1_LRH_BTH) { |
77241056 | 619 | ohdr = &hdr->u.oth; |
e490974e | 620 | } else if (lnh == HFI1_LRH_GRH) { |
77241056 MM |
621 | ohdr = &hdr->u.l.oth; |
622 | grh = &hdr->u.l.grh; | |
e490974e | 623 | } else { |
77241056 | 624 | goto next; /* just in case */ |
e490974e | 625 | } |
977940b8 AK |
626 | bth1 = be32_to_cpu(ohdr->bth[1]); |
627 | is_ecn = !!(bth1 & (HFI1_FECN_SMASK | HFI1_BECN_SMASK)); | |
77241056 MM |
628 | |
629 | if (!is_ecn) | |
630 | goto next; | |
631 | ||
ec4274f1 | 632 | qpn = bth1 & RVT_QPN_MASK; |
77241056 | 633 | rcu_read_lock(); |
ec4274f1 | 634 | qp = rvt_lookup_qpn(rdi, &ibp->rvp, qpn); |
77241056 | 635 | |
d125a6c6 | 636 | if (!qp) { |
77241056 MM |
637 | rcu_read_unlock(); |
638 | goto next; | |
639 | } | |
640 | ||
977940b8 | 641 | process_ecn(qp, hdr, ohdr, rhf, bth1, grh); |
77241056 | 642 | rcu_read_unlock(); |
977940b8 AK |
643 | |
644 | /* turn off BECN, FECN */ | |
645 | bth1 &= ~(HFI1_FECN_SMASK | HFI1_BECN_SMASK); | |
646 | ohdr->bth[1] = cpu_to_be32(bth1); | |
77241056 | 647 | next: |
82c2611d | 648 | update_ps_mdata(&mdata, rcd); |
77241056 MM |
649 | } |
650 | } | |
82c2611d NV |
651 | |
652 | static inline int skip_rcv_packet(struct hfi1_packet *packet, int thread) | |
653 | { | |
654 | int ret = RCV_PKT_OK; | |
655 | ||
656 | /* Set up for the next packet */ | |
657 | packet->rhqoff += packet->rsize; | |
658 | if (packet->rhqoff >= packet->maxcnt) | |
659 | packet->rhqoff = 0; | |
660 | ||
661 | packet->numpkt++; | |
662 | if (unlikely((packet->numpkt & (MAX_PKT_RECV - 1)) == 0)) { | |
663 | if (thread) { | |
664 | cond_resched(); | |
665 | } else { | |
666 | ret = RCV_PKT_LIMIT; | |
667 | this_cpu_inc(*packet->rcd->dd->rcv_limit); | |
668 | } | |
669 | } | |
670 | ||
671 | packet->rhf_addr = (__le32 *)packet->rcd->rcvhdrq + packet->rhqoff + | |
672 | packet->rcd->dd->rhf_offset; | |
673 | packet->rhf = rhf_to_cpu(packet->rhf_addr); | |
674 | ||
675 | return ret; | |
676 | } | |
77241056 | 677 | |
f4f30031 | 678 | static inline int process_rcv_packet(struct hfi1_packet *packet, int thread) |
77241056 MM |
679 | { |
680 | int ret = RCV_PKT_OK; | |
681 | ||
682 | packet->hdr = hfi1_get_msgheader(packet->rcd->dd, | |
683 | packet->rhf_addr); | |
684 | packet->hlen = (u8 *)packet->rhf_addr - (u8 *)packet->hdr; | |
685 | packet->etype = rhf_rcv_type(packet->rhf); | |
686 | /* total length */ | |
687 | packet->tlen = rhf_pkt_len(packet->rhf); /* in bytes */ | |
688 | /* retrieve eager buffer details */ | |
689 | packet->ebuf = NULL; | |
690 | if (rhf_use_egr_bfr(packet->rhf)) { | |
691 | packet->etail = rhf_egr_index(packet->rhf); | |
692 | packet->ebuf = get_egrbuf(packet->rcd, packet->rhf, | |
693 | &packet->updegr); | |
694 | /* | |
695 | * Prefetch the contents of the eager buffer. It is | |
696 | * OK to send a negative length to prefetch_range(). | |
697 | * The +2 is the size of the RHF. | |
698 | */ | |
699 | prefetch_range(packet->ebuf, | |
17fb4f29 JJ |
700 | packet->tlen - ((packet->rcd->rcvhdrqentsize - |
701 | (rhf_hdrq_offset(packet->rhf) | |
702 | + 2)) * 4)); | |
77241056 MM |
703 | } |
704 | ||
705 | /* | |
706 | * Call a type specific handler for the packet. We | |
707 | * should be able to trust that etype won't be beyond | |
708 | * the range of valid indexes. If so something is really | |
709 | * wrong and we can probably just let things come | |
710 | * crashing down. There is no need to eat another | |
711 | * comparison in this performance critical code. | |
712 | */ | |
713 | packet->rcd->dd->rhf_rcv_function_map[packet->etype](packet); | |
714 | packet->numpkt++; | |
715 | ||
716 | /* Set up for the next packet */ | |
717 | packet->rhqoff += packet->rsize; | |
718 | if (packet->rhqoff >= packet->maxcnt) | |
719 | packet->rhqoff = 0; | |
720 | ||
f4f30031 DL |
721 | if (unlikely((packet->numpkt & (MAX_PKT_RECV - 1)) == 0)) { |
722 | if (thread) { | |
723 | cond_resched(); | |
724 | } else { | |
725 | ret = RCV_PKT_LIMIT; | |
726 | this_cpu_inc(*packet->rcd->dd->rcv_limit); | |
727 | } | |
77241056 MM |
728 | } |
729 | ||
50e5dcbe | 730 | packet->rhf_addr = (__le32 *)packet->rcd->rcvhdrq + packet->rhqoff + |
77241056 MM |
731 | packet->rcd->dd->rhf_offset; |
732 | packet->rhf = rhf_to_cpu(packet->rhf_addr); | |
733 | ||
734 | return ret; | |
735 | } | |
736 | ||
737 | static inline void process_rcv_update(int last, struct hfi1_packet *packet) | |
738 | { | |
739 | /* | |
740 | * Update head regs etc., every 16 packets, if not last pkt, | |
741 | * to help prevent rcvhdrq overflows, when many packets | |
742 | * are processed and queue is nearly full. | |
743 | * Don't request an interrupt for intermediate updates. | |
744 | */ | |
745 | if (!last && !(packet->numpkt & 0xf)) { | |
746 | update_usrhead(packet->rcd, packet->rhqoff, packet->updegr, | |
747 | packet->etail, 0, 0); | |
748 | packet->updegr = 0; | |
749 | } | |
750 | packet->rcv_flags = 0; | |
751 | } | |
752 | ||
753 | static inline void finish_packet(struct hfi1_packet *packet) | |
754 | { | |
77241056 MM |
755 | /* |
756 | * Nothing we need to free for the packet. | |
757 | * | |
758 | * The only thing we need to do is a final update and call for an | |
759 | * interrupt | |
760 | */ | |
761 | update_usrhead(packet->rcd, packet->rcd->head, packet->updegr, | |
762 | packet->etail, rcv_intr_dynamic, packet->numpkt); | |
77241056 MM |
763 | } |
764 | ||
765 | static inline void process_rcv_qp_work(struct hfi1_packet *packet) | |
766 | { | |
77241056 | 767 | struct hfi1_ctxtdata *rcd; |
895420dd | 768 | struct rvt_qp *qp, *nqp; |
77241056 MM |
769 | |
770 | rcd = packet->rcd; | |
771 | rcd->head = packet->rhqoff; | |
772 | ||
773 | /* | |
774 | * Iterate over all QPs waiting to respond. | |
775 | * The list won't change since the IRQ is only run on one CPU. | |
776 | */ | |
777 | list_for_each_entry_safe(qp, nqp, &rcd->qp_wait_list, rspwait) { | |
778 | list_del_init(&qp->rspwait); | |
54d10c1e DD |
779 | if (qp->r_flags & RVT_R_RSP_NAK) { |
780 | qp->r_flags &= ~RVT_R_RSP_NAK; | |
77241056 MM |
781 | hfi1_send_rc_ack(rcd, qp, 0); |
782 | } | |
54d10c1e | 783 | if (qp->r_flags & RVT_R_RSP_SEND) { |
77241056 MM |
784 | unsigned long flags; |
785 | ||
54d10c1e | 786 | qp->r_flags &= ~RVT_R_RSP_SEND; |
77241056 | 787 | spin_lock_irqsave(&qp->s_lock, flags); |
83693bd1 DD |
788 | if (ib_rvt_state_ops[qp->state] & |
789 | RVT_PROCESS_OR_FLUSH_SEND) | |
77241056 MM |
790 | hfi1_schedule_send(qp); |
791 | spin_unlock_irqrestore(&qp->s_lock, flags); | |
792 | } | |
793 | if (atomic_dec_and_test(&qp->refcount)) | |
794 | wake_up(&qp->wait); | |
795 | } | |
796 | } | |
797 | ||
798 | /* | |
799 | * Handle receive interrupts when using the no dma rtail option. | |
800 | */ | |
f4f30031 | 801 | int handle_receive_interrupt_nodma_rtail(struct hfi1_ctxtdata *rcd, int thread) |
77241056 MM |
802 | { |
803 | u32 seq; | |
f4f30031 | 804 | int last = RCV_PKT_OK; |
77241056 MM |
805 | struct hfi1_packet packet; |
806 | ||
807 | init_packet(rcd, &packet); | |
808 | seq = rhf_rcv_seq(packet.rhf); | |
f4f30031 DL |
809 | if (seq != rcd->seq_cnt) { |
810 | last = RCV_PKT_DONE; | |
77241056 | 811 | goto bail; |
f4f30031 | 812 | } |
77241056 | 813 | |
6c9e50f8 | 814 | prescan_rxq(rcd, &packet); |
77241056 | 815 | |
f4f30031 DL |
816 | while (last == RCV_PKT_OK) { |
817 | last = process_rcv_packet(&packet, thread); | |
77241056 MM |
818 | seq = rhf_rcv_seq(packet.rhf); |
819 | if (++rcd->seq_cnt > 13) | |
820 | rcd->seq_cnt = 1; | |
821 | if (seq != rcd->seq_cnt) | |
f4f30031 | 822 | last = RCV_PKT_DONE; |
77241056 MM |
823 | process_rcv_update(last, &packet); |
824 | } | |
825 | process_rcv_qp_work(&packet); | |
826 | bail: | |
827 | finish_packet(&packet); | |
f4f30031 | 828 | return last; |
77241056 MM |
829 | } |
830 | ||
f4f30031 | 831 | int handle_receive_interrupt_dma_rtail(struct hfi1_ctxtdata *rcd, int thread) |
77241056 MM |
832 | { |
833 | u32 hdrqtail; | |
f4f30031 | 834 | int last = RCV_PKT_OK; |
77241056 MM |
835 | struct hfi1_packet packet; |
836 | ||
837 | init_packet(rcd, &packet); | |
838 | hdrqtail = get_rcvhdrtail(rcd); | |
f4f30031 DL |
839 | if (packet.rhqoff == hdrqtail) { |
840 | last = RCV_PKT_DONE; | |
77241056 | 841 | goto bail; |
f4f30031 | 842 | } |
77241056 MM |
843 | smp_rmb(); /* prevent speculative reads of dma'ed hdrq */ |
844 | ||
6c9e50f8 | 845 | prescan_rxq(rcd, &packet); |
77241056 | 846 | |
f4f30031 DL |
847 | while (last == RCV_PKT_OK) { |
848 | last = process_rcv_packet(&packet, thread); | |
77241056 | 849 | if (packet.rhqoff == hdrqtail) |
f4f30031 | 850 | last = RCV_PKT_DONE; |
77241056 MM |
851 | process_rcv_update(last, &packet); |
852 | } | |
853 | process_rcv_qp_work(&packet); | |
854 | bail: | |
855 | finish_packet(&packet); | |
f4f30031 | 856 | return last; |
77241056 MM |
857 | } |
858 | ||
859 | static inline void set_all_nodma_rtail(struct hfi1_devdata *dd) | |
860 | { | |
861 | int i; | |
862 | ||
82c2611d | 863 | for (i = HFI1_CTRL_CTXT + 1; i < dd->first_user_ctxt; i++) |
77241056 MM |
864 | dd->rcd[i]->do_interrupt = |
865 | &handle_receive_interrupt_nodma_rtail; | |
866 | } | |
867 | ||
868 | static inline void set_all_dma_rtail(struct hfi1_devdata *dd) | |
869 | { | |
870 | int i; | |
871 | ||
82c2611d | 872 | for (i = HFI1_CTRL_CTXT + 1; i < dd->first_user_ctxt; i++) |
77241056 MM |
873 | dd->rcd[i]->do_interrupt = |
874 | &handle_receive_interrupt_dma_rtail; | |
875 | } | |
876 | ||
fb9036dd JS |
877 | void set_all_slowpath(struct hfi1_devdata *dd) |
878 | { | |
879 | int i; | |
880 | ||
881 | /* HFI1_CTRL_CTXT must always use the slow path interrupt handler */ | |
882 | for (i = HFI1_CTRL_CTXT + 1; i < dd->first_user_ctxt; i++) | |
883 | dd->rcd[i]->do_interrupt = &handle_receive_interrupt; | |
884 | } | |
885 | ||
886 | static inline int set_armed_to_active(struct hfi1_ctxtdata *rcd, | |
887 | struct hfi1_packet packet, | |
888 | struct hfi1_devdata *dd) | |
889 | { | |
890 | struct work_struct *lsaw = &rcd->ppd->linkstate_active_work; | |
891 | struct hfi1_message_header *hdr = hfi1_get_msgheader(packet.rcd->dd, | |
892 | packet.rhf_addr); | |
893 | ||
894 | if (hdr2sc(hdr, packet.rhf) != 0xf) { | |
895 | int hwstate = read_logical_state(dd); | |
896 | ||
897 | if (hwstate != LSTATE_ACTIVE) { | |
898 | dd_dev_info(dd, "Unexpected link state %d\n", hwstate); | |
899 | return 0; | |
900 | } | |
901 | ||
902 | queue_work(rcd->ppd->hfi1_wq, lsaw); | |
903 | return 1; | |
904 | } | |
905 | return 0; | |
906 | } | |
907 | ||
77241056 MM |
908 | /* |
909 | * handle_receive_interrupt - receive a packet | |
910 | * @rcd: the context | |
911 | * | |
912 | * Called from interrupt handler for errors or receive interrupt. | |
913 | * This is the slow path interrupt handler. | |
914 | */ | |
f4f30031 | 915 | int handle_receive_interrupt(struct hfi1_ctxtdata *rcd, int thread) |
77241056 | 916 | { |
77241056 MM |
917 | struct hfi1_devdata *dd = rcd->dd; |
918 | u32 hdrqtail; | |
82c2611d | 919 | int needset, last = RCV_PKT_OK; |
77241056 | 920 | struct hfi1_packet packet; |
82c2611d NV |
921 | int skip_pkt = 0; |
922 | ||
923 | /* Control context will always use the slow path interrupt handler */ | |
924 | needset = (rcd->ctxt == HFI1_CTRL_CTXT) ? 0 : 1; | |
77241056 MM |
925 | |
926 | init_packet(rcd, &packet); | |
927 | ||
82c2611d | 928 | if (!HFI1_CAP_KGET_MASK(rcd->flags, DMA_RTAIL)) { |
77241056 MM |
929 | u32 seq = rhf_rcv_seq(packet.rhf); |
930 | ||
f4f30031 DL |
931 | if (seq != rcd->seq_cnt) { |
932 | last = RCV_PKT_DONE; | |
77241056 | 933 | goto bail; |
f4f30031 | 934 | } |
77241056 MM |
935 | hdrqtail = 0; |
936 | } else { | |
937 | hdrqtail = get_rcvhdrtail(rcd); | |
f4f30031 DL |
938 | if (packet.rhqoff == hdrqtail) { |
939 | last = RCV_PKT_DONE; | |
77241056 | 940 | goto bail; |
f4f30031 | 941 | } |
77241056 | 942 | smp_rmb(); /* prevent speculative reads of dma'ed hdrq */ |
82c2611d NV |
943 | |
944 | /* | |
945 | * Control context can potentially receive an invalid | |
946 | * rhf. Drop such packets. | |
947 | */ | |
948 | if (rcd->ctxt == HFI1_CTRL_CTXT) { | |
949 | u32 seq = rhf_rcv_seq(packet.rhf); | |
950 | ||
951 | if (seq != rcd->seq_cnt) | |
952 | skip_pkt = 1; | |
953 | } | |
77241056 MM |
954 | } |
955 | ||
6c9e50f8 | 956 | prescan_rxq(rcd, &packet); |
77241056 | 957 | |
f4f30031 | 958 | while (last == RCV_PKT_OK) { |
17fb4f29 JJ |
959 | if (unlikely(dd->do_drop && |
960 | atomic_xchg(&dd->drop_packet, DROP_PACKET_OFF) == | |
961 | DROP_PACKET_ON)) { | |
77241056 MM |
962 | dd->do_drop = 0; |
963 | ||
964 | /* On to the next packet */ | |
965 | packet.rhqoff += packet.rsize; | |
50e5dcbe | 966 | packet.rhf_addr = (__le32 *)rcd->rcvhdrq + |
77241056 MM |
967 | packet.rhqoff + |
968 | dd->rhf_offset; | |
969 | packet.rhf = rhf_to_cpu(packet.rhf_addr); | |
970 | ||
82c2611d NV |
971 | } else if (skip_pkt) { |
972 | last = skip_rcv_packet(&packet, thread); | |
973 | skip_pkt = 0; | |
77241056 | 974 | } else { |
fb9036dd JS |
975 | /* Auto activate link on non-SC15 packet receive */ |
976 | if (unlikely(rcd->ppd->host_link_state == | |
977 | HLS_UP_ARMED) && | |
978 | set_armed_to_active(rcd, packet, dd)) | |
979 | goto bail; | |
f4f30031 | 980 | last = process_rcv_packet(&packet, thread); |
77241056 MM |
981 | } |
982 | ||
82c2611d | 983 | if (!HFI1_CAP_KGET_MASK(rcd->flags, DMA_RTAIL)) { |
77241056 MM |
984 | u32 seq = rhf_rcv_seq(packet.rhf); |
985 | ||
986 | if (++rcd->seq_cnt > 13) | |
987 | rcd->seq_cnt = 1; | |
988 | if (seq != rcd->seq_cnt) | |
f4f30031 | 989 | last = RCV_PKT_DONE; |
77241056 | 990 | if (needset) { |
17fb4f29 | 991 | dd_dev_info(dd, "Switching to NO_DMA_RTAIL\n"); |
77241056 MM |
992 | set_all_nodma_rtail(dd); |
993 | needset = 0; | |
994 | } | |
995 | } else { | |
996 | if (packet.rhqoff == hdrqtail) | |
f4f30031 | 997 | last = RCV_PKT_DONE; |
82c2611d NV |
998 | /* |
999 | * Control context can potentially receive an invalid | |
1000 | * rhf. Drop such packets. | |
1001 | */ | |
1002 | if (rcd->ctxt == HFI1_CTRL_CTXT) { | |
1003 | u32 seq = rhf_rcv_seq(packet.rhf); | |
1004 | ||
1005 | if (++rcd->seq_cnt > 13) | |
1006 | rcd->seq_cnt = 1; | |
1007 | if (!last && (seq != rcd->seq_cnt)) | |
1008 | skip_pkt = 1; | |
1009 | } | |
1010 | ||
77241056 MM |
1011 | if (needset) { |
1012 | dd_dev_info(dd, | |
1013 | "Switching to DMA_RTAIL\n"); | |
1014 | set_all_dma_rtail(dd); | |
1015 | needset = 0; | |
1016 | } | |
1017 | } | |
1018 | ||
1019 | process_rcv_update(last, &packet); | |
1020 | } | |
1021 | ||
1022 | process_rcv_qp_work(&packet); | |
1023 | ||
1024 | bail: | |
1025 | /* | |
1026 | * Always write head at end, and setup rcv interrupt, even | |
1027 | * if no packets were processed. | |
1028 | */ | |
1029 | finish_packet(&packet); | |
f4f30031 | 1030 | return last; |
77241056 MM |
1031 | } |
1032 | ||
fb9036dd JS |
1033 | /* |
1034 | * We may discover in the interrupt that the hardware link state has | |
1035 | * changed from ARMED to ACTIVE (due to the arrival of a non-SC15 packet), | |
1036 | * and we need to update the driver's notion of the link state. We cannot | |
1037 | * run set_link_state from interrupt context, so we queue this function on | |
1038 | * a workqueue. | |
1039 | * | |
1040 | * We delay the regular interrupt processing until after the state changes | |
1041 | * so that the link will be in the correct state by the time any application | |
1042 | * we wake up attempts to send a reply to any message it received. | |
1043 | * (Subsequent receive interrupts may possibly force the wakeup before we | |
1044 | * update the link state.) | |
1045 | * | |
1046 | * The rcd is freed in hfi1_free_ctxtdata after hfi1_postinit_cleanup invokes | |
1047 | * dd->f_cleanup(dd) to disable the interrupt handler and flush workqueues, | |
1048 | * so we're safe from use-after-free of the rcd. | |
1049 | */ | |
1050 | void receive_interrupt_work(struct work_struct *work) | |
1051 | { | |
1052 | struct hfi1_pportdata *ppd = container_of(work, struct hfi1_pportdata, | |
1053 | linkstate_active_work); | |
1054 | struct hfi1_devdata *dd = ppd->dd; | |
1055 | int i; | |
1056 | ||
1057 | /* Received non-SC15 packet implies neighbor_normal */ | |
1058 | ppd->neighbor_normal = 1; | |
1059 | set_link_state(ppd, HLS_UP_ACTIVE); | |
1060 | ||
1061 | /* | |
1062 | * Interrupt all kernel contexts that could have had an | |
1063 | * interrupt during auto activation. | |
1064 | */ | |
1065 | for (i = HFI1_CTRL_CTXT; i < dd->first_user_ctxt; i++) | |
1066 | force_recv_intr(dd->rcd[i]); | |
1067 | } | |
1068 | ||
77241056 MM |
1069 | /* |
1070 | * Convert a given MTU size to the on-wire MAD packet enumeration. | |
1071 | * Return -1 if the size is invalid. | |
1072 | */ | |
1073 | int mtu_to_enum(u32 mtu, int default_if_bad) | |
1074 | { | |
1075 | switch (mtu) { | |
1076 | case 0: return OPA_MTU_0; | |
1077 | case 256: return OPA_MTU_256; | |
1078 | case 512: return OPA_MTU_512; | |
1079 | case 1024: return OPA_MTU_1024; | |
1080 | case 2048: return OPA_MTU_2048; | |
1081 | case 4096: return OPA_MTU_4096; | |
1082 | case 8192: return OPA_MTU_8192; | |
1083 | case 10240: return OPA_MTU_10240; | |
1084 | } | |
1085 | return default_if_bad; | |
1086 | } | |
1087 | ||
1088 | u16 enum_to_mtu(int mtu) | |
1089 | { | |
1090 | switch (mtu) { | |
1091 | case OPA_MTU_0: return 0; | |
1092 | case OPA_MTU_256: return 256; | |
1093 | case OPA_MTU_512: return 512; | |
1094 | case OPA_MTU_1024: return 1024; | |
1095 | case OPA_MTU_2048: return 2048; | |
1096 | case OPA_MTU_4096: return 4096; | |
1097 | case OPA_MTU_8192: return 8192; | |
1098 | case OPA_MTU_10240: return 10240; | |
1099 | default: return 0xffff; | |
1100 | } | |
1101 | } | |
1102 | ||
1103 | /* | |
1104 | * set_mtu - set the MTU | |
1105 | * @ppd: the per port data | |
1106 | * | |
1107 | * We can handle "any" incoming size, the issue here is whether we | |
1108 | * need to restrict our outgoing size. We do not deal with what happens | |
1109 | * to programs that are already running when the size changes. | |
1110 | */ | |
1111 | int set_mtu(struct hfi1_pportdata *ppd) | |
1112 | { | |
1113 | struct hfi1_devdata *dd = ppd->dd; | |
1114 | int i, drain, ret = 0, is_up = 0; | |
1115 | ||
1116 | ppd->ibmtu = 0; | |
1117 | for (i = 0; i < ppd->vls_supported; i++) | |
1118 | if (ppd->ibmtu < dd->vld[i].mtu) | |
1119 | ppd->ibmtu = dd->vld[i].mtu; | |
1120 | ppd->ibmaxlen = ppd->ibmtu + lrh_max_header_bytes(ppd->dd); | |
1121 | ||
1122 | mutex_lock(&ppd->hls_lock); | |
d0d236ea JJ |
1123 | if (ppd->host_link_state == HLS_UP_INIT || |
1124 | ppd->host_link_state == HLS_UP_ARMED || | |
1125 | ppd->host_link_state == HLS_UP_ACTIVE) | |
77241056 MM |
1126 | is_up = 1; |
1127 | ||
1128 | drain = !is_ax(dd) && is_up; | |
1129 | ||
1130 | if (drain) | |
1131 | /* | |
1132 | * MTU is specified per-VL. To ensure that no packet gets | |
1133 | * stuck (due, e.g., to the MTU for the packet's VL being | |
1134 | * reduced), empty the per-VL FIFOs before adjusting MTU. | |
1135 | */ | |
1136 | ret = stop_drain_data_vls(dd); | |
1137 | ||
1138 | if (ret) { | |
1139 | dd_dev_err(dd, "%s: cannot stop/drain VLs - refusing to change per-VL MTUs\n", | |
1140 | __func__); | |
1141 | goto err; | |
1142 | } | |
1143 | ||
1144 | hfi1_set_ib_cfg(ppd, HFI1_IB_CFG_MTU, 0); | |
1145 | ||
1146 | if (drain) | |
1147 | open_fill_data_vls(dd); /* reopen all VLs */ | |
1148 | ||
1149 | err: | |
1150 | mutex_unlock(&ppd->hls_lock); | |
1151 | ||
1152 | return ret; | |
1153 | } | |
1154 | ||
1155 | int hfi1_set_lid(struct hfi1_pportdata *ppd, u32 lid, u8 lmc) | |
1156 | { | |
1157 | struct hfi1_devdata *dd = ppd->dd; | |
1158 | ||
1159 | ppd->lid = lid; | |
1160 | ppd->lmc = lmc; | |
1161 | hfi1_set_ib_cfg(ppd, HFI1_IB_CFG_LIDLMC, 0); | |
1162 | ||
1163 | dd_dev_info(dd, "IB%u:%u got a lid: 0x%x\n", dd->unit, ppd->port, lid); | |
1164 | ||
1165 | return 0; | |
1166 | } | |
1167 | ||
91ab4ed3 EH |
1168 | void shutdown_led_override(struct hfi1_pportdata *ppd) |
1169 | { | |
1170 | struct hfi1_devdata *dd = ppd->dd; | |
1171 | ||
1172 | if (atomic_read(&ppd->led_override_timer_active)) { | |
1173 | del_timer_sync(&ppd->led_override_timer); | |
1174 | atomic_set(&ppd->led_override_timer_active, 0); | |
1175 | } | |
1176 | ||
1177 | /* Shut off LEDs after we are sure timer is not running */ | |
1178 | setextled(dd, 0); | |
1179 | } | |
77241056 MM |
1180 | |
1181 | static void run_led_override(unsigned long opaque) | |
1182 | { | |
1183 | struct hfi1_pportdata *ppd = (struct hfi1_pportdata *)opaque; | |
1184 | struct hfi1_devdata *dd = ppd->dd; | |
91ab4ed3 EH |
1185 | unsigned long timeout; |
1186 | int phase_idx; | |
77241056 MM |
1187 | |
1188 | if (!(dd->flags & HFI1_INITTED)) | |
1189 | return; | |
1190 | ||
91ab4ed3 EH |
1191 | phase_idx = ppd->led_override_phase & 1; |
1192 | setextled(dd, phase_idx); | |
1193 | ||
1194 | timeout = ppd->led_override_vals[phase_idx]; | |
1195 | /* Set up for next phase */ | |
1196 | ppd->led_override_phase = !ppd->led_override_phase; | |
77241056 MM |
1197 | |
1198 | /* | |
1199 | * don't re-fire the timer if user asked for it to be off; we let | |
1200 | * it fire one more time after they turn it off to simplify | |
1201 | */ | |
1202 | if (ppd->led_override_vals[0] || ppd->led_override_vals[1]) | |
91ab4ed3 EH |
1203 | mod_timer(&ppd->led_override_timer, jiffies + timeout); |
1204 | else | |
1205 | /* Hand control of the LED to the DC for normal operation */ | |
1206 | write_csr(dd, DCC_CFG_LED_CNTRL, 0); | |
77241056 MM |
1207 | } |
1208 | ||
91ab4ed3 EH |
1209 | /* |
1210 | * To have the LED blink in a particular pattern, provide timeon and timeoff | |
1211 | * in milliseconds. To turn off custom blinking and return to normal operation, | |
1212 | * provide timeon = timeoff = 0. | |
1213 | */ | |
1214 | void hfi1_set_led_override(struct hfi1_pportdata *ppd, unsigned int timeon, | |
1215 | unsigned int timeoff) | |
77241056 MM |
1216 | { |
1217 | struct hfi1_devdata *dd = ppd->dd; | |
77241056 MM |
1218 | |
1219 | if (!(dd->flags & HFI1_INITTED)) | |
1220 | return; | |
1221 | ||
91ab4ed3 EH |
1222 | /* Convert to jiffies for direct use in timer */ |
1223 | ppd->led_override_vals[0] = msecs_to_jiffies(timeoff); | |
1224 | ppd->led_override_vals[1] = msecs_to_jiffies(timeon); | |
1225 | ppd->led_override_phase = 1; /* Arbitrarily start from LED on phase */ | |
77241056 MM |
1226 | |
1227 | /* | |
1228 | * If the timer has not already been started, do so. Use a "quick" | |
1229 | * timeout so the function will be called soon, to look at our request. | |
1230 | */ | |
1231 | if (atomic_inc_return(&ppd->led_override_timer_active) == 1) { | |
1232 | /* Need to start timer */ | |
a3faf606 | 1233 | setup_timer(&ppd->led_override_timer, run_led_override, |
17fb4f29 | 1234 | (unsigned long)ppd); |
a3faf606 | 1235 | |
77241056 MM |
1236 | ppd->led_override_timer.expires = jiffies + 1; |
1237 | add_timer(&ppd->led_override_timer); | |
1238 | } else { | |
1239 | if (ppd->led_override_vals[0] || ppd->led_override_vals[1]) | |
1240 | mod_timer(&ppd->led_override_timer, jiffies + 1); | |
1241 | atomic_dec(&ppd->led_override_timer_active); | |
1242 | } | |
1243 | } | |
1244 | ||
1245 | /** | |
1246 | * hfi1_reset_device - reset the chip if possible | |
1247 | * @unit: the device to reset | |
1248 | * | |
1249 | * Whether or not reset is successful, we attempt to re-initialize the chip | |
1250 | * (that is, much like a driver unload/reload). We clear the INITTED flag | |
1251 | * so that the various entry points will fail until we reinitialize. For | |
1252 | * now, we only allow this if no user contexts are open that use chip resources | |
1253 | */ | |
1254 | int hfi1_reset_device(int unit) | |
1255 | { | |
1256 | int ret, i; | |
1257 | struct hfi1_devdata *dd = hfi1_lookup(unit); | |
1258 | struct hfi1_pportdata *ppd; | |
1259 | unsigned long flags; | |
1260 | int pidx; | |
1261 | ||
1262 | if (!dd) { | |
1263 | ret = -ENODEV; | |
1264 | goto bail; | |
1265 | } | |
1266 | ||
1267 | dd_dev_info(dd, "Reset on unit %u requested\n", unit); | |
1268 | ||
1269 | if (!dd->kregbase || !(dd->flags & HFI1_PRESENT)) { | |
1270 | dd_dev_info(dd, | |
17fb4f29 JJ |
1271 | "Invalid unit number %u or not initialized or not present\n", |
1272 | unit); | |
77241056 MM |
1273 | ret = -ENXIO; |
1274 | goto bail; | |
1275 | } | |
1276 | ||
1277 | spin_lock_irqsave(&dd->uctxt_lock, flags); | |
1278 | if (dd->rcd) | |
1279 | for (i = dd->first_user_ctxt; i < dd->num_rcv_contexts; i++) { | |
1280 | if (!dd->rcd[i] || !dd->rcd[i]->cnt) | |
1281 | continue; | |
1282 | spin_unlock_irqrestore(&dd->uctxt_lock, flags); | |
1283 | ret = -EBUSY; | |
1284 | goto bail; | |
1285 | } | |
1286 | spin_unlock_irqrestore(&dd->uctxt_lock, flags); | |
1287 | ||
1288 | for (pidx = 0; pidx < dd->num_pports; ++pidx) { | |
1289 | ppd = dd->pport + pidx; | |
77241056 | 1290 | |
91ab4ed3 | 1291 | shutdown_led_override(ppd); |
77241056 MM |
1292 | } |
1293 | if (dd->flags & HFI1_HAS_SEND_DMA) | |
1294 | sdma_exit(dd); | |
1295 | ||
1296 | hfi1_reset_cpu_counters(dd); | |
1297 | ||
1298 | ret = hfi1_init(dd, 1); | |
1299 | ||
1300 | if (ret) | |
1301 | dd_dev_err(dd, | |
17fb4f29 JJ |
1302 | "Reinitialize unit %u after reset failed with %d\n", |
1303 | unit, ret); | |
77241056 MM |
1304 | else |
1305 | dd_dev_info(dd, "Reinitialized unit %u after resetting\n", | |
17fb4f29 | 1306 | unit); |
77241056 MM |
1307 | |
1308 | bail: | |
1309 | return ret; | |
1310 | } | |
1311 | ||
1312 | void handle_eflags(struct hfi1_packet *packet) | |
1313 | { | |
1314 | struct hfi1_ctxtdata *rcd = packet->rcd; | |
1315 | u32 rte = rhf_rcv_type_err(packet->rhf); | |
1316 | ||
77241056 | 1317 | rcv_hdrerr(rcd, rcd->ppd, packet); |
a03a03e9 IH |
1318 | if (rhf_err_flags(packet->rhf)) |
1319 | dd_dev_err(rcd->dd, | |
1320 | "receive context %d: rhf 0x%016llx, errs [ %s%s%s%s%s%s%s%s] rte 0x%x\n", | |
1321 | rcd->ctxt, packet->rhf, | |
1322 | packet->rhf & RHF_K_HDR_LEN_ERR ? "k_hdr_len " : "", | |
1323 | packet->rhf & RHF_DC_UNC_ERR ? "dc_unc " : "", | |
1324 | packet->rhf & RHF_DC_ERR ? "dc " : "", | |
1325 | packet->rhf & RHF_TID_ERR ? "tid " : "", | |
1326 | packet->rhf & RHF_LEN_ERR ? "len " : "", | |
1327 | packet->rhf & RHF_ECC_ERR ? "ecc " : "", | |
1328 | packet->rhf & RHF_VCRC_ERR ? "vcrc " : "", | |
1329 | packet->rhf & RHF_ICRC_ERR ? "icrc " : "", | |
1330 | rte); | |
77241056 MM |
1331 | } |
1332 | ||
1333 | /* | |
1334 | * The following functions are called by the interrupt handler. They are type | |
1335 | * specific handlers for each packet type. | |
1336 | */ | |
1337 | int process_receive_ib(struct hfi1_packet *packet) | |
1338 | { | |
1339 | trace_hfi1_rcvhdr(packet->rcd->ppd->dd, | |
1340 | packet->rcd->ctxt, | |
1341 | rhf_err_flags(packet->rhf), | |
1342 | RHF_RCV_TYPE_IB, | |
1343 | packet->hlen, | |
1344 | packet->tlen, | |
1345 | packet->updegr, | |
1346 | rhf_egr_index(packet->rhf)); | |
1347 | ||
1348 | if (unlikely(rhf_err_flags(packet->rhf))) { | |
1349 | handle_eflags(packet); | |
1350 | return RHF_RCV_CONTINUE; | |
1351 | } | |
1352 | ||
1353 | hfi1_ib_rcv(packet); | |
1354 | return RHF_RCV_CONTINUE; | |
1355 | } | |
1356 | ||
1357 | int process_receive_bypass(struct hfi1_packet *packet) | |
1358 | { | |
1359 | if (unlikely(rhf_err_flags(packet->rhf))) | |
1360 | handle_eflags(packet); | |
1361 | ||
1362 | dd_dev_err(packet->rcd->dd, | |
17fb4f29 | 1363 | "Bypass packets are not supported in normal operation. Dropping\n"); |
77241056 MM |
1364 | return RHF_RCV_CONTINUE; |
1365 | } | |
1366 | ||
1367 | int process_receive_error(struct hfi1_packet *packet) | |
1368 | { | |
1369 | handle_eflags(packet); | |
1370 | ||
1371 | if (unlikely(rhf_err_flags(packet->rhf))) | |
1372 | dd_dev_err(packet->rcd->dd, | |
1373 | "Unhandled error packet received. Dropping.\n"); | |
1374 | ||
1375 | return RHF_RCV_CONTINUE; | |
1376 | } | |
1377 | ||
1378 | int kdeth_process_expected(struct hfi1_packet *packet) | |
1379 | { | |
1380 | if (unlikely(rhf_err_flags(packet->rhf))) | |
1381 | handle_eflags(packet); | |
1382 | ||
1383 | dd_dev_err(packet->rcd->dd, | |
1384 | "Unhandled expected packet received. Dropping.\n"); | |
1385 | return RHF_RCV_CONTINUE; | |
1386 | } | |
1387 | ||
1388 | int kdeth_process_eager(struct hfi1_packet *packet) | |
1389 | { | |
1390 | if (unlikely(rhf_err_flags(packet->rhf))) | |
1391 | handle_eflags(packet); | |
1392 | ||
1393 | dd_dev_err(packet->rcd->dd, | |
1394 | "Unhandled eager packet received. Dropping.\n"); | |
1395 | return RHF_RCV_CONTINUE; | |
1396 | } | |
1397 | ||
1398 | int process_receive_invalid(struct hfi1_packet *packet) | |
1399 | { | |
1400 | dd_dev_err(packet->rcd->dd, "Invalid packet type %d. Dropping\n", | |
17fb4f29 | 1401 | rhf_rcv_type(packet->rhf)); |
77241056 MM |
1402 | return RHF_RCV_CONTINUE; |
1403 | } |