Commit | Line | Data |
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74ed6b5e | 1 | /* |
759d5768 | 2 | * Copyright (c) 2006 QLogic, Inc. All rights reserved. |
74ed6b5e BS |
3 | * Copyright (c) 2005, 2006 PathScale, Inc. All rights reserved. |
4 | * | |
5 | * This software is available to you under a choice of one of two | |
6 | * licenses. You may choose to be licensed under the terms of the GNU | |
7 | * General Public License (GPL) Version 2, available from the file | |
8 | * COPYING in the main directory of this source tree, or the | |
9 | * OpenIB.org BSD license below: | |
10 | * | |
11 | * Redistribution and use in source and binary forms, with or | |
12 | * without modification, are permitted provided that the following | |
13 | * conditions are met: | |
14 | * | |
15 | * - Redistributions of source code must retain the above | |
16 | * copyright notice, this list of conditions and the following | |
17 | * disclaimer. | |
18 | * | |
19 | * - Redistributions in binary form must reproduce the above | |
20 | * copyright notice, this list of conditions and the following | |
21 | * disclaimer in the documentation and/or other materials | |
22 | * provided with the distribution. | |
23 | * | |
24 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, | |
25 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF | |
26 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND | |
27 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS | |
28 | * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN | |
29 | * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN | |
30 | * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | |
31 | * SOFTWARE. | |
32 | */ | |
33 | ||
34 | #include <rdma/ib_smi.h> | |
35 | ||
36 | #include "ipath_verbs.h" | |
373d9915 RC |
37 | #include "ipath_kernel.h" |
38 | ||
39 | static int init_sge(struct ipath_qp *qp, struct ipath_rwqe *wqe, | |
40 | u32 *lengthp, struct ipath_sge_state *ss) | |
41 | { | |
42 | struct ipath_ibdev *dev = to_idev(qp->ibqp.device); | |
43 | int user = to_ipd(qp->ibqp.pd)->user; | |
44 | int i, j, ret; | |
45 | struct ib_wc wc; | |
46 | ||
47 | *lengthp = 0; | |
48 | for (i = j = 0; i < wqe->num_sge; i++) { | |
49 | if (wqe->sg_list[i].length == 0) | |
50 | continue; | |
51 | /* Check LKEY */ | |
52 | if ((user && wqe->sg_list[i].lkey == 0) || | |
53 | !ipath_lkey_ok(&dev->lk_table, | |
54 | j ? &ss->sg_list[j - 1] : &ss->sge, | |
55 | &wqe->sg_list[i], IB_ACCESS_LOCAL_WRITE)) | |
56 | goto bad_lkey; | |
57 | *lengthp += wqe->sg_list[i].length; | |
58 | j++; | |
59 | } | |
60 | ss->num_sge = j; | |
61 | ret = 1; | |
62 | goto bail; | |
63 | ||
64 | bad_lkey: | |
65 | wc.wr_id = wqe->wr_id; | |
66 | wc.status = IB_WC_LOC_PROT_ERR; | |
67 | wc.opcode = IB_WC_RECV; | |
68 | wc.vendor_err = 0; | |
69 | wc.byte_len = 0; | |
70 | wc.imm_data = 0; | |
71 | wc.qp_num = qp->ibqp.qp_num; | |
72 | wc.src_qp = 0; | |
73 | wc.wc_flags = 0; | |
74 | wc.pkey_index = 0; | |
75 | wc.slid = 0; | |
76 | wc.sl = 0; | |
77 | wc.dlid_path_bits = 0; | |
78 | wc.port_num = 0; | |
79 | /* Signal solicited completion event. */ | |
80 | ipath_cq_enter(to_icq(qp->ibqp.recv_cq), &wc, 1); | |
81 | ret = 0; | |
82 | bail: | |
83 | return ret; | |
84 | } | |
74ed6b5e BS |
85 | |
86 | /** | |
87 | * ipath_ud_loopback - handle send on loopback QPs | |
88 | * @sqp: the QP | |
89 | * @ss: the SGE state | |
90 | * @length: the length of the data to send | |
91 | * @wr: the work request | |
92 | * @wc: the work completion entry | |
93 | * | |
94 | * This is called from ipath_post_ud_send() to forward a WQE addressed | |
95 | * to the same HCA. | |
373d9915 RC |
96 | * Note that the receive interrupt handler may be calling ipath_ud_rcv() |
97 | * while this is being called. | |
74ed6b5e | 98 | */ |
f6f0413e BS |
99 | static void ipath_ud_loopback(struct ipath_qp *sqp, |
100 | struct ipath_sge_state *ss, | |
101 | u32 length, struct ib_send_wr *wr, | |
102 | struct ib_wc *wc) | |
74ed6b5e BS |
103 | { |
104 | struct ipath_ibdev *dev = to_idev(sqp->ibqp.device); | |
105 | struct ipath_qp *qp; | |
106 | struct ib_ah_attr *ah_attr; | |
107 | unsigned long flags; | |
108 | struct ipath_rq *rq; | |
109 | struct ipath_srq *srq; | |
110 | struct ipath_sge_state rsge; | |
111 | struct ipath_sge *sge; | |
373d9915 | 112 | struct ipath_rwq *wq; |
74ed6b5e | 113 | struct ipath_rwqe *wqe; |
373d9915 RC |
114 | void (*handler)(struct ib_event *, void *); |
115 | u32 tail; | |
116 | u32 rlen; | |
74ed6b5e BS |
117 | |
118 | qp = ipath_lookup_qpn(&dev->qp_table, wr->wr.ud.remote_qpn); | |
119 | if (!qp) | |
120 | return; | |
121 | ||
122 | /* | |
123 | * Check that the qkey matches (except for QP0, see 9.6.1.4.1). | |
124 | * Qkeys with the high order bit set mean use the | |
125 | * qkey from the QP context instead of the WR (see 10.2.5). | |
126 | */ | |
127 | if (unlikely(qp->ibqp.qp_num && | |
128 | ((int) wr->wr.ud.remote_qkey < 0 | |
129 | ? qp->qkey : wr->wr.ud.remote_qkey) != qp->qkey)) { | |
130 | /* XXX OK to lose a count once in a while. */ | |
131 | dev->qkey_violations++; | |
132 | dev->n_pkt_drops++; | |
133 | goto done; | |
134 | } | |
135 | ||
136 | /* | |
137 | * A GRH is expected to preceed the data even if not | |
138 | * present on the wire. | |
139 | */ | |
140 | wc->byte_len = length + sizeof(struct ib_grh); | |
141 | ||
142 | if (wr->opcode == IB_WR_SEND_WITH_IMM) { | |
143 | wc->wc_flags = IB_WC_WITH_IMM; | |
144 | wc->imm_data = wr->imm_data; | |
145 | } else { | |
146 | wc->wc_flags = 0; | |
147 | wc->imm_data = 0; | |
148 | } | |
149 | ||
373d9915 RC |
150 | if (wr->num_sge > 1) { |
151 | rsge.sg_list = kmalloc((wr->num_sge - 1) * | |
152 | sizeof(struct ipath_sge), | |
153 | GFP_ATOMIC); | |
154 | } else | |
155 | rsge.sg_list = NULL; | |
156 | ||
74ed6b5e BS |
157 | /* |
158 | * Get the next work request entry to find where to put the data. | |
159 | * Note that it is safe to drop the lock after changing rq->tail | |
160 | * since ipath_post_receive() won't fill the empty slot. | |
161 | */ | |
162 | if (qp->ibqp.srq) { | |
163 | srq = to_isrq(qp->ibqp.srq); | |
373d9915 | 164 | handler = srq->ibsrq.event_handler; |
74ed6b5e BS |
165 | rq = &srq->rq; |
166 | } else { | |
167 | srq = NULL; | |
373d9915 | 168 | handler = NULL; |
74ed6b5e BS |
169 | rq = &qp->r_rq; |
170 | } | |
373d9915 | 171 | |
74ed6b5e | 172 | spin_lock_irqsave(&rq->lock, flags); |
373d9915 RC |
173 | wq = rq->wq; |
174 | tail = wq->tail; | |
175 | while (1) { | |
176 | if (unlikely(tail == wq->head)) { | |
177 | spin_unlock_irqrestore(&rq->lock, flags); | |
178 | dev->n_pkt_drops++; | |
179 | goto bail_sge; | |
180 | } | |
181 | wqe = get_rwqe_ptr(rq, tail); | |
182 | if (++tail >= rq->size) | |
183 | tail = 0; | |
184 | if (init_sge(qp, wqe, &rlen, &rsge)) | |
185 | break; | |
186 | wq->tail = tail; | |
74ed6b5e BS |
187 | } |
188 | /* Silently drop packets which are too big. */ | |
373d9915 | 189 | if (wc->byte_len > rlen) { |
74ed6b5e BS |
190 | spin_unlock_irqrestore(&rq->lock, flags); |
191 | dev->n_pkt_drops++; | |
373d9915 | 192 | goto bail_sge; |
74ed6b5e | 193 | } |
373d9915 | 194 | wq->tail = tail; |
74ed6b5e | 195 | wc->wr_id = wqe->wr_id; |
373d9915 | 196 | if (handler) { |
74ed6b5e BS |
197 | u32 n; |
198 | ||
373d9915 RC |
199 | /* |
200 | * validate head pointer value and compute | |
201 | * the number of remaining WQEs. | |
202 | */ | |
203 | n = wq->head; | |
204 | if (n >= rq->size) | |
205 | n = 0; | |
206 | if (n < tail) | |
207 | n += rq->size - tail; | |
74ed6b5e | 208 | else |
373d9915 | 209 | n -= tail; |
74ed6b5e BS |
210 | if (n < srq->limit) { |
211 | struct ib_event ev; | |
212 | ||
213 | srq->limit = 0; | |
214 | spin_unlock_irqrestore(&rq->lock, flags); | |
215 | ev.device = qp->ibqp.device; | |
216 | ev.element.srq = qp->ibqp.srq; | |
217 | ev.event = IB_EVENT_SRQ_LIMIT_REACHED; | |
373d9915 | 218 | handler(&ev, srq->ibsrq.srq_context); |
74ed6b5e BS |
219 | } else |
220 | spin_unlock_irqrestore(&rq->lock, flags); | |
221 | } else | |
222 | spin_unlock_irqrestore(&rq->lock, flags); | |
373d9915 | 223 | |
74ed6b5e BS |
224 | ah_attr = &to_iah(wr->wr.ud.ah)->attr; |
225 | if (ah_attr->ah_flags & IB_AH_GRH) { | |
226 | ipath_copy_sge(&rsge, &ah_attr->grh, sizeof(struct ib_grh)); | |
227 | wc->wc_flags |= IB_WC_GRH; | |
228 | } else | |
229 | ipath_skip_sge(&rsge, sizeof(struct ib_grh)); | |
230 | sge = &ss->sge; | |
231 | while (length) { | |
232 | u32 len = sge->length; | |
233 | ||
234 | if (len > length) | |
235 | len = length; | |
236 | BUG_ON(len == 0); | |
237 | ipath_copy_sge(&rsge, sge->vaddr, len); | |
238 | sge->vaddr += len; | |
239 | sge->length -= len; | |
240 | sge->sge_length -= len; | |
241 | if (sge->sge_length == 0) { | |
242 | if (--ss->num_sge) | |
243 | *sge = *ss->sg_list++; | |
244 | } else if (sge->length == 0 && sge->mr != NULL) { | |
245 | if (++sge->n >= IPATH_SEGSZ) { | |
246 | if (++sge->m >= sge->mr->mapsz) | |
247 | break; | |
248 | sge->n = 0; | |
249 | } | |
250 | sge->vaddr = | |
251 | sge->mr->map[sge->m]->segs[sge->n].vaddr; | |
252 | sge->length = | |
253 | sge->mr->map[sge->m]->segs[sge->n].length; | |
254 | } | |
255 | length -= len; | |
256 | } | |
257 | wc->status = IB_WC_SUCCESS; | |
258 | wc->opcode = IB_WC_RECV; | |
259 | wc->vendor_err = 0; | |
260 | wc->qp_num = qp->ibqp.qp_num; | |
261 | wc->src_qp = sqp->ibqp.qp_num; | |
262 | /* XXX do we know which pkey matched? Only needed for GSI. */ | |
263 | wc->pkey_index = 0; | |
373d9915 | 264 | wc->slid = dev->dd->ipath_lid | |
74ed6b5e BS |
265 | (ah_attr->src_path_bits & |
266 | ((1 << (dev->mkeyprot_resv_lmc & 7)) - 1)); | |
267 | wc->sl = ah_attr->sl; | |
268 | wc->dlid_path_bits = | |
269 | ah_attr->dlid & ((1 << (dev->mkeyprot_resv_lmc & 7)) - 1); | |
270 | /* Signal completion event if the solicited bit is set. */ | |
271 | ipath_cq_enter(to_icq(qp->ibqp.recv_cq), wc, | |
272 | wr->send_flags & IB_SEND_SOLICITED); | |
273 | ||
373d9915 RC |
274 | bail_sge: |
275 | kfree(rsge.sg_list); | |
74ed6b5e BS |
276 | done: |
277 | if (atomic_dec_and_test(&qp->refcount)) | |
278 | wake_up(&qp->wait); | |
279 | } | |
280 | ||
281 | /** | |
282 | * ipath_post_ud_send - post a UD send on QP | |
283 | * @qp: the QP | |
284 | * @wr: the work request | |
285 | * | |
286 | * Note that we actually send the data as it is posted instead of putting | |
287 | * the request into a ring buffer. If we wanted to use a ring buffer, | |
288 | * we would need to save a reference to the destination address in the SWQE. | |
289 | */ | |
290 | int ipath_post_ud_send(struct ipath_qp *qp, struct ib_send_wr *wr) | |
291 | { | |
292 | struct ipath_ibdev *dev = to_idev(qp->ibqp.device); | |
293 | struct ipath_other_headers *ohdr; | |
294 | struct ib_ah_attr *ah_attr; | |
295 | struct ipath_sge_state ss; | |
296 | struct ipath_sge *sg_list; | |
297 | struct ib_wc wc; | |
298 | u32 hwords; | |
299 | u32 nwords; | |
300 | u32 len; | |
301 | u32 extra_bytes; | |
302 | u32 bth0; | |
303 | u16 lrh0; | |
304 | u16 lid; | |
305 | int i; | |
306 | int ret; | |
307 | ||
308 | if (!(ib_ipath_state_ops[qp->state] & IPATH_PROCESS_SEND_OK)) { | |
309 | ret = 0; | |
310 | goto bail; | |
311 | } | |
312 | ||
313 | /* IB spec says that num_sge == 0 is OK. */ | |
314 | if (wr->num_sge > qp->s_max_sge) { | |
315 | ret = -EINVAL; | |
316 | goto bail; | |
317 | } | |
318 | ||
319 | if (wr->num_sge > 1) { | |
320 | sg_list = kmalloc((qp->s_max_sge - 1) * sizeof(*sg_list), | |
321 | GFP_ATOMIC); | |
322 | if (!sg_list) { | |
323 | ret = -ENOMEM; | |
324 | goto bail; | |
325 | } | |
326 | } else | |
327 | sg_list = NULL; | |
328 | ||
329 | /* Check the buffer to send. */ | |
330 | ss.sg_list = sg_list; | |
331 | ss.sge.mr = NULL; | |
332 | ss.sge.vaddr = NULL; | |
333 | ss.sge.length = 0; | |
334 | ss.sge.sge_length = 0; | |
335 | ss.num_sge = 0; | |
336 | len = 0; | |
337 | for (i = 0; i < wr->num_sge; i++) { | |
338 | /* Check LKEY */ | |
339 | if (to_ipd(qp->ibqp.pd)->user && wr->sg_list[i].lkey == 0) { | |
340 | ret = -EINVAL; | |
341 | goto bail; | |
342 | } | |
343 | ||
344 | if (wr->sg_list[i].length == 0) | |
345 | continue; | |
346 | if (!ipath_lkey_ok(&dev->lk_table, ss.num_sge ? | |
347 | sg_list + ss.num_sge - 1 : &ss.sge, | |
348 | &wr->sg_list[i], 0)) { | |
349 | ret = -EINVAL; | |
350 | goto bail; | |
351 | } | |
352 | len += wr->sg_list[i].length; | |
353 | ss.num_sge++; | |
354 | } | |
4faba98a BS |
355 | /* Check for invalid packet size. */ |
356 | if (len > ipath_layer_get_ibmtu(dev->dd)) { | |
357 | ret = -EINVAL; | |
358 | goto bail; | |
359 | } | |
74ed6b5e BS |
360 | extra_bytes = (4 - len) & 3; |
361 | nwords = (len + extra_bytes) >> 2; | |
362 | ||
363 | /* Construct the header. */ | |
364 | ah_attr = &to_iah(wr->wr.ud.ah)->attr; | |
365 | if (ah_attr->dlid == 0) { | |
366 | ret = -EINVAL; | |
367 | goto bail; | |
368 | } | |
27b678dd BS |
369 | if (ah_attr->dlid >= IPATH_MULTICAST_LID_BASE) { |
370 | if (ah_attr->dlid != IPATH_PERMISSIVE_LID) | |
74ed6b5e BS |
371 | dev->n_multicast_xmit++; |
372 | else | |
373 | dev->n_unicast_xmit++; | |
374 | } else { | |
375 | dev->n_unicast_xmit++; | |
376 | lid = ah_attr->dlid & | |
377 | ~((1 << (dev->mkeyprot_resv_lmc & 7)) - 1); | |
378 | if (unlikely(lid == ipath_layer_get_lid(dev->dd))) { | |
379 | /* | |
380 | * Pass in an uninitialized ib_wc to save stack | |
381 | * space. | |
382 | */ | |
383 | ipath_ud_loopback(qp, &ss, len, wr, &wc); | |
384 | goto done; | |
385 | } | |
386 | } | |
387 | if (ah_attr->ah_flags & IB_AH_GRH) { | |
388 | /* Header size in 32-bit words. */ | |
389 | hwords = 17; | |
27b678dd | 390 | lrh0 = IPATH_LRH_GRH; |
74ed6b5e BS |
391 | ohdr = &qp->s_hdr.u.l.oth; |
392 | qp->s_hdr.u.l.grh.version_tclass_flow = | |
393 | cpu_to_be32((6 << 28) | | |
394 | (ah_attr->grh.traffic_class << 20) | | |
395 | ah_attr->grh.flow_label); | |
396 | qp->s_hdr.u.l.grh.paylen = | |
397 | cpu_to_be16(((wr->opcode == | |
398 | IB_WR_SEND_WITH_IMM ? 6 : 5) + | |
399 | nwords + SIZE_OF_CRC) << 2); | |
400 | /* next_hdr is defined by C8-7 in ch. 8.4.1 */ | |
401 | qp->s_hdr.u.l.grh.next_hdr = 0x1B; | |
402 | qp->s_hdr.u.l.grh.hop_limit = ah_attr->grh.hop_limit; | |
403 | /* The SGID is 32-bit aligned. */ | |
404 | qp->s_hdr.u.l.grh.sgid.global.subnet_prefix = | |
405 | dev->gid_prefix; | |
406 | qp->s_hdr.u.l.grh.sgid.global.interface_id = | |
407 | ipath_layer_get_guid(dev->dd); | |
408 | qp->s_hdr.u.l.grh.dgid = ah_attr->grh.dgid; | |
409 | /* | |
410 | * Don't worry about sending to locally attached multicast | |
411 | * QPs. It is unspecified by the spec. what happens. | |
412 | */ | |
413 | } else { | |
414 | /* Header size in 32-bit words. */ | |
415 | hwords = 7; | |
27b678dd | 416 | lrh0 = IPATH_LRH_BTH; |
74ed6b5e BS |
417 | ohdr = &qp->s_hdr.u.oth; |
418 | } | |
419 | if (wr->opcode == IB_WR_SEND_WITH_IMM) { | |
420 | ohdr->u.ud.imm_data = wr->imm_data; | |
421 | wc.imm_data = wr->imm_data; | |
422 | hwords += 1; | |
423 | bth0 = IB_OPCODE_UD_SEND_ONLY_WITH_IMMEDIATE << 24; | |
424 | } else if (wr->opcode == IB_WR_SEND) { | |
425 | wc.imm_data = 0; | |
426 | bth0 = IB_OPCODE_UD_SEND_ONLY << 24; | |
427 | } else { | |
428 | ret = -EINVAL; | |
429 | goto bail; | |
430 | } | |
431 | lrh0 |= ah_attr->sl << 4; | |
432 | if (qp->ibqp.qp_type == IB_QPT_SMI) | |
433 | lrh0 |= 0xF000; /* Set VL (see ch. 13.5.3.1) */ | |
434 | qp->s_hdr.lrh[0] = cpu_to_be16(lrh0); | |
435 | qp->s_hdr.lrh[1] = cpu_to_be16(ah_attr->dlid); /* DEST LID */ | |
436 | qp->s_hdr.lrh[2] = cpu_to_be16(hwords + nwords + SIZE_OF_CRC); | |
437 | lid = ipath_layer_get_lid(dev->dd); | |
438 | if (lid) { | |
439 | lid |= ah_attr->src_path_bits & | |
440 | ((1 << (dev->mkeyprot_resv_lmc & 7)) - 1); | |
441 | qp->s_hdr.lrh[3] = cpu_to_be16(lid); | |
442 | } else | |
443 | qp->s_hdr.lrh[3] = IB_LID_PERMISSIVE; | |
444 | if (wr->send_flags & IB_SEND_SOLICITED) | |
445 | bth0 |= 1 << 23; | |
446 | bth0 |= extra_bytes << 20; | |
27b678dd | 447 | bth0 |= qp->ibqp.qp_type == IB_QPT_SMI ? IPATH_DEFAULT_P_KEY : |
74ed6b5e BS |
448 | ipath_layer_get_pkey(dev->dd, qp->s_pkey_index); |
449 | ohdr->bth[0] = cpu_to_be32(bth0); | |
450 | /* | |
451 | * Use the multicast QP if the destination LID is a multicast LID. | |
452 | */ | |
27b678dd BS |
453 | ohdr->bth[1] = ah_attr->dlid >= IPATH_MULTICAST_LID_BASE && |
454 | ah_attr->dlid != IPATH_PERMISSIVE_LID ? | |
455 | __constant_cpu_to_be32(IPATH_MULTICAST_QPN) : | |
74ed6b5e BS |
456 | cpu_to_be32(wr->wr.ud.remote_qpn); |
457 | /* XXX Could lose a PSN count but not worth locking */ | |
27b678dd | 458 | ohdr->bth[2] = cpu_to_be32(qp->s_next_psn++ & IPATH_PSN_MASK); |
74ed6b5e BS |
459 | /* |
460 | * Qkeys with the high order bit set mean use the | |
461 | * qkey from the QP context instead of the WR (see 10.2.5). | |
462 | */ | |
463 | ohdr->u.ud.deth[0] = cpu_to_be32((int)wr->wr.ud.remote_qkey < 0 ? | |
464 | qp->qkey : wr->wr.ud.remote_qkey); | |
465 | ohdr->u.ud.deth[1] = cpu_to_be32(qp->ibqp.qp_num); | |
466 | if (ipath_verbs_send(dev->dd, hwords, (u32 *) &qp->s_hdr, | |
467 | len, &ss)) | |
468 | dev->n_no_piobuf++; | |
469 | ||
470 | done: | |
471 | /* Queue the completion status entry. */ | |
472 | if (!test_bit(IPATH_S_SIGNAL_REQ_WR, &qp->s_flags) || | |
473 | (wr->send_flags & IB_SEND_SIGNALED)) { | |
474 | wc.wr_id = wr->wr_id; | |
475 | wc.status = IB_WC_SUCCESS; | |
476 | wc.vendor_err = 0; | |
477 | wc.opcode = IB_WC_SEND; | |
478 | wc.byte_len = len; | |
479 | wc.qp_num = qp->ibqp.qp_num; | |
480 | wc.src_qp = 0; | |
481 | wc.wc_flags = 0; | |
482 | /* XXX initialize other fields? */ | |
483 | ipath_cq_enter(to_icq(qp->ibqp.send_cq), &wc, 0); | |
484 | } | |
485 | kfree(sg_list); | |
486 | ||
487 | ret = 0; | |
488 | ||
489 | bail: | |
490 | return ret; | |
491 | } | |
492 | ||
493 | /** | |
494 | * ipath_ud_rcv - receive an incoming UD packet | |
495 | * @dev: the device the packet came in on | |
496 | * @hdr: the packet header | |
497 | * @has_grh: true if the packet has a GRH | |
498 | * @data: the packet data | |
499 | * @tlen: the packet length | |
500 | * @qp: the QP the packet came on | |
501 | * | |
502 | * This is called from ipath_qp_rcv() to process an incoming UD packet | |
503 | * for the given QP. | |
504 | * Called at interrupt level. | |
505 | */ | |
506 | void ipath_ud_rcv(struct ipath_ibdev *dev, struct ipath_ib_header *hdr, | |
507 | int has_grh, void *data, u32 tlen, struct ipath_qp *qp) | |
508 | { | |
509 | struct ipath_other_headers *ohdr; | |
510 | int opcode; | |
511 | u32 hdrsize; | |
512 | u32 pad; | |
74ed6b5e BS |
513 | struct ib_wc wc; |
514 | u32 qkey; | |
515 | u32 src_qp; | |
74ed6b5e BS |
516 | u16 dlid; |
517 | int header_in_data; | |
518 | ||
519 | /* Check for GRH */ | |
520 | if (!has_grh) { | |
521 | ohdr = &hdr->u.oth; | |
522 | hdrsize = 8 + 12 + 8; /* LRH + BTH + DETH */ | |
523 | qkey = be32_to_cpu(ohdr->u.ud.deth[0]); | |
524 | src_qp = be32_to_cpu(ohdr->u.ud.deth[1]); | |
525 | header_in_data = 0; | |
526 | } else { | |
527 | ohdr = &hdr->u.l.oth; | |
528 | hdrsize = 8 + 40 + 12 + 8; /* LRH + GRH + BTH + DETH */ | |
529 | /* | |
530 | * The header with GRH is 68 bytes and the core driver sets | |
531 | * the eager header buffer size to 56 bytes so the last 12 | |
532 | * bytes of the IB header is in the data buffer. | |
533 | */ | |
534 | header_in_data = | |
535 | ipath_layer_get_rcvhdrentsize(dev->dd) == 16; | |
536 | if (header_in_data) { | |
537 | qkey = be32_to_cpu(((__be32 *) data)[1]); | |
538 | src_qp = be32_to_cpu(((__be32 *) data)[2]); | |
539 | data += 12; | |
540 | } else { | |
541 | qkey = be32_to_cpu(ohdr->u.ud.deth[0]); | |
542 | src_qp = be32_to_cpu(ohdr->u.ud.deth[1]); | |
543 | } | |
544 | } | |
27b678dd | 545 | src_qp &= IPATH_QPN_MASK; |
74ed6b5e BS |
546 | |
547 | /* | |
548 | * Check that the permissive LID is only used on QP0 | |
549 | * and the QKEY matches (see 9.6.1.4.1 and 9.6.1.5.1). | |
550 | */ | |
551 | if (qp->ibqp.qp_num) { | |
552 | if (unlikely(hdr->lrh[1] == IB_LID_PERMISSIVE || | |
553 | hdr->lrh[3] == IB_LID_PERMISSIVE)) { | |
554 | dev->n_pkt_drops++; | |
555 | goto bail; | |
556 | } | |
557 | if (unlikely(qkey != qp->qkey)) { | |
558 | /* XXX OK to lose a count once in a while. */ | |
559 | dev->qkey_violations++; | |
560 | dev->n_pkt_drops++; | |
561 | goto bail; | |
562 | } | |
563 | } else if (hdr->lrh[1] == IB_LID_PERMISSIVE || | |
564 | hdr->lrh[3] == IB_LID_PERMISSIVE) { | |
565 | struct ib_smp *smp = (struct ib_smp *) data; | |
566 | ||
567 | if (smp->mgmt_class != IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) { | |
568 | dev->n_pkt_drops++; | |
569 | goto bail; | |
570 | } | |
571 | } | |
572 | ||
573 | /* Get the number of bytes the message was padded by. */ | |
574 | pad = (be32_to_cpu(ohdr->bth[0]) >> 20) & 3; | |
575 | if (unlikely(tlen < (hdrsize + pad + 4))) { | |
576 | /* Drop incomplete packets. */ | |
577 | dev->n_pkt_drops++; | |
578 | goto bail; | |
579 | } | |
580 | tlen -= hdrsize + pad + 4; | |
581 | ||
582 | /* Drop invalid MAD packets (see 13.5.3.1). */ | |
583 | if (unlikely((qp->ibqp.qp_num == 0 && | |
584 | (tlen != 256 || | |
585 | (be16_to_cpu(hdr->lrh[0]) >> 12) != 15)) || | |
586 | (qp->ibqp.qp_num == 1 && | |
587 | (tlen != 256 || | |
588 | (be16_to_cpu(hdr->lrh[0]) >> 12) == 15)))) { | |
589 | dev->n_pkt_drops++; | |
590 | goto bail; | |
591 | } | |
592 | ||
593 | /* | |
594 | * A GRH is expected to preceed the data even if not | |
595 | * present on the wire. | |
596 | */ | |
597 | wc.byte_len = tlen + sizeof(struct ib_grh); | |
598 | ||
599 | /* | |
600 | * The opcode is in the low byte when its in network order | |
601 | * (top byte when in host order). | |
602 | */ | |
603 | opcode = be32_to_cpu(ohdr->bth[0]) >> 24; | |
604 | if (qp->ibqp.qp_num > 1 && | |
605 | opcode == IB_OPCODE_UD_SEND_ONLY_WITH_IMMEDIATE) { | |
606 | if (header_in_data) { | |
607 | wc.imm_data = *(__be32 *) data; | |
608 | data += sizeof(__be32); | |
609 | } else | |
610 | wc.imm_data = ohdr->u.ud.imm_data; | |
611 | wc.wc_flags = IB_WC_WITH_IMM; | |
612 | hdrsize += sizeof(u32); | |
613 | } else if (opcode == IB_OPCODE_UD_SEND_ONLY) { | |
614 | wc.imm_data = 0; | |
615 | wc.wc_flags = 0; | |
616 | } else { | |
617 | dev->n_pkt_drops++; | |
618 | goto bail; | |
619 | } | |
620 | ||
621 | /* | |
622 | * Get the next work request entry to find where to put the data. | |
74ed6b5e | 623 | */ |
373d9915 RC |
624 | if (qp->r_reuse_sge) |
625 | qp->r_reuse_sge = 0; | |
626 | else if (!ipath_get_rwqe(qp, 0)) { | |
fba75200 BS |
627 | /* |
628 | * Count VL15 packets dropped due to no receive buffer. | |
629 | * Otherwise, count them as buffer overruns since usually, | |
630 | * the HW will be able to receive packets even if there are | |
631 | * no QPs with posted receive buffers. | |
632 | */ | |
633 | if (qp->ibqp.qp_num == 0) | |
634 | dev->n_vl15_dropped++; | |
635 | else | |
636 | dev->rcv_errors++; | |
74ed6b5e BS |
637 | goto bail; |
638 | } | |
639 | /* Silently drop packets which are too big. */ | |
373d9915 RC |
640 | if (wc.byte_len > qp->r_len) { |
641 | qp->r_reuse_sge = 1; | |
74ed6b5e BS |
642 | dev->n_pkt_drops++; |
643 | goto bail; | |
644 | } | |
74ed6b5e BS |
645 | if (has_grh) { |
646 | ipath_copy_sge(&qp->r_sge, &hdr->u.l.grh, | |
647 | sizeof(struct ib_grh)); | |
648 | wc.wc_flags |= IB_WC_GRH; | |
649 | } else | |
650 | ipath_skip_sge(&qp->r_sge, sizeof(struct ib_grh)); | |
651 | ipath_copy_sge(&qp->r_sge, data, | |
652 | wc.byte_len - sizeof(struct ib_grh)); | |
373d9915 | 653 | wc.wr_id = qp->r_wr_id; |
74ed6b5e BS |
654 | wc.status = IB_WC_SUCCESS; |
655 | wc.opcode = IB_WC_RECV; | |
656 | wc.vendor_err = 0; | |
657 | wc.qp_num = qp->ibqp.qp_num; | |
658 | wc.src_qp = src_qp; | |
659 | /* XXX do we know which pkey matched? Only needed for GSI. */ | |
660 | wc.pkey_index = 0; | |
661 | wc.slid = be16_to_cpu(hdr->lrh[3]); | |
662 | wc.sl = (be16_to_cpu(hdr->lrh[0]) >> 4) & 0xF; | |
663 | dlid = be16_to_cpu(hdr->lrh[1]); | |
664 | /* | |
665 | * Save the LMC lower bits if the destination LID is a unicast LID. | |
666 | */ | |
27b678dd | 667 | wc.dlid_path_bits = dlid >= IPATH_MULTICAST_LID_BASE ? 0 : |
74ed6b5e BS |
668 | dlid & ((1 << (dev->mkeyprot_resv_lmc & 7)) - 1); |
669 | /* Signal completion event if the solicited bit is set. */ | |
670 | ipath_cq_enter(to_icq(qp->ibqp.recv_cq), &wc, | |
671 | (ohdr->bth[0] & | |
672 | __constant_cpu_to_be32(1 << 23)) != 0); | |
673 | ||
674 | bail:; | |
675 | } |