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1// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
2/*
3 * Copyright(c) 2015 - 2019 Intel Corporation.
4 */
5
6#include <linux/net.h>
7#include <rdma/ib_smi.h>
8
9#include "hfi.h"
10#include "mad.h"
11#include "verbs_txreq.h"
12#include "trace_ibhdrs.h"
13#include "qp.h"
14
15/* We support only two types - 9B and 16B for now */
16static const hfi1_make_req hfi1_make_ud_req_tbl[2] = {
17 [HFI1_PKT_TYPE_9B] = &hfi1_make_ud_req_9B,
18 [HFI1_PKT_TYPE_16B] = &hfi1_make_ud_req_16B
19};
20
21/**
22 * ud_loopback - handle send on loopback QPs
23 * @sqp: the sending QP
24 * @swqe: the send work request
25 *
26 * This is called from hfi1_make_ud_req() to forward a WQE addressed
27 * to the same HFI.
28 * Note that the receive interrupt handler may be calling hfi1_ud_rcv()
29 * while this is being called.
30 */
31static void ud_loopback(struct rvt_qp *sqp, struct rvt_swqe *swqe)
32{
33 struct hfi1_ibport *ibp = to_iport(sqp->ibqp.device, sqp->port_num);
34 struct hfi1_pportdata *ppd;
35 struct hfi1_qp_priv *priv = sqp->priv;
36 struct rvt_qp *qp;
37 struct rdma_ah_attr *ah_attr;
38 unsigned long flags;
39 struct rvt_sge_state ssge;
40 struct rvt_sge *sge;
41 struct ib_wc wc;
42 u32 length;
43 enum ib_qp_type sqptype, dqptype;
44
45 rcu_read_lock();
46
47 qp = rvt_lookup_qpn(ib_to_rvt(sqp->ibqp.device), &ibp->rvp,
48 rvt_get_swqe_remote_qpn(swqe));
49 if (!qp) {
50 ibp->rvp.n_pkt_drops++;
51 rcu_read_unlock();
52 return;
53 }
54
55 sqptype = sqp->ibqp.qp_type == IB_QPT_GSI ?
56 IB_QPT_UD : sqp->ibqp.qp_type;
57 dqptype = qp->ibqp.qp_type == IB_QPT_GSI ?
58 IB_QPT_UD : qp->ibqp.qp_type;
59
60 if (dqptype != sqptype ||
61 !(ib_rvt_state_ops[qp->state] & RVT_PROCESS_RECV_OK)) {
62 ibp->rvp.n_pkt_drops++;
63 goto drop;
64 }
65
66 ah_attr = rvt_get_swqe_ah_attr(swqe);
67 ppd = ppd_from_ibp(ibp);
68
69 if (qp->ibqp.qp_num > 1) {
70 u16 pkey;
71 u32 slid;
72 u8 sc5 = ibp->sl_to_sc[rdma_ah_get_sl(ah_attr)];
73
74 pkey = hfi1_get_pkey(ibp, sqp->s_pkey_index);
75 slid = ppd->lid | (rdma_ah_get_path_bits(ah_attr) &
76 ((1 << ppd->lmc) - 1));
77 if (unlikely(ingress_pkey_check(ppd, pkey, sc5,
78 qp->s_pkey_index,
79 slid, false))) {
80 hfi1_bad_pkey(ibp, pkey,
81 rdma_ah_get_sl(ah_attr),
82 sqp->ibqp.qp_num, qp->ibqp.qp_num,
83 slid, rdma_ah_get_dlid(ah_attr));
84 goto drop;
85 }
86 }
87
88 /*
89 * Check that the qkey matches (except for QP0, see 9.6.1.4.1).
90 * Qkeys with the high order bit set mean use the
91 * qkey from the QP context instead of the WR (see 10.2.5).
92 */
93 if (qp->ibqp.qp_num) {
94 u32 qkey;
95
96 qkey = (int)rvt_get_swqe_remote_qkey(swqe) < 0 ?
97 sqp->qkey : rvt_get_swqe_remote_qkey(swqe);
98 if (unlikely(qkey != qp->qkey))
99 goto drop; /* silently drop per IBTA spec */
100 }
101
102 /*
103 * A GRH is expected to precede the data even if not
104 * present on the wire.
105 */
106 length = swqe->length;
107 memset(&wc, 0, sizeof(wc));
108 wc.byte_len = length + sizeof(struct ib_grh);
109
110 if (swqe->wr.opcode == IB_WR_SEND_WITH_IMM) {
111 wc.wc_flags = IB_WC_WITH_IMM;
112 wc.ex.imm_data = swqe->wr.ex.imm_data;
113 }
114
115 spin_lock_irqsave(&qp->r_lock, flags);
116
117 /*
118 * Get the next work request entry to find where to put the data.
119 */
120 if (qp->r_flags & RVT_R_REUSE_SGE) {
121 qp->r_flags &= ~RVT_R_REUSE_SGE;
122 } else {
123 int ret;
124
125 ret = rvt_get_rwqe(qp, false);
126 if (ret < 0) {
127 rvt_rc_error(qp, IB_WC_LOC_QP_OP_ERR);
128 goto bail_unlock;
129 }
130 if (!ret) {
131 if (qp->ibqp.qp_num == 0)
132 ibp->rvp.n_vl15_dropped++;
133 goto bail_unlock;
134 }
135 }
136 /* Silently drop packets which are too big. */
137 if (unlikely(wc.byte_len > qp->r_len)) {
138 qp->r_flags |= RVT_R_REUSE_SGE;
139 ibp->rvp.n_pkt_drops++;
140 goto bail_unlock;
141 }
142
143 if (rdma_ah_get_ah_flags(ah_attr) & IB_AH_GRH) {
144 struct ib_grh grh;
145 struct ib_global_route grd = *(rdma_ah_read_grh(ah_attr));
146
147 /*
148 * For loopback packets with extended LIDs, the
149 * sgid_index in the GRH is 0 and the dgid is
150 * OPA GID of the sender. While creating a response
151 * to the loopback packet, IB core creates the new
152 * sgid_index from the DGID and that will be the
153 * OPA_GID_INDEX. The new dgid is from the sgid
154 * index and that will be in the IB GID format.
155 *
156 * We now have a case where the sent packet had a
157 * different sgid_index and dgid compared to the
158 * one that was received in response.
159 *
160 * Fix this inconsistency.
161 */
162 if (priv->hdr_type == HFI1_PKT_TYPE_16B) {
163 if (grd.sgid_index == 0)
164 grd.sgid_index = OPA_GID_INDEX;
165
166 if (ib_is_opa_gid(&grd.dgid))
167 grd.dgid.global.interface_id =
168 cpu_to_be64(ppd->guids[HFI1_PORT_GUID_INDEX]);
169 }
170
171 hfi1_make_grh(ibp, &grh, &grd, 0, 0);
172 rvt_copy_sge(qp, &qp->r_sge, &grh,
173 sizeof(grh), true, false);
174 wc.wc_flags |= IB_WC_GRH;
175 } else {
176 rvt_skip_sge(&qp->r_sge, sizeof(struct ib_grh), true);
177 }
178 ssge.sg_list = swqe->sg_list + 1;
179 ssge.sge = *swqe->sg_list;
180 ssge.num_sge = swqe->wr.num_sge;
181 sge = &ssge.sge;
182 while (length) {
183 u32 len = rvt_get_sge_length(sge, length);
184
185 WARN_ON_ONCE(len == 0);
186 rvt_copy_sge(qp, &qp->r_sge, sge->vaddr, len, true, false);
187 rvt_update_sge(&ssge, len, false);
188 length -= len;
189 }
190 rvt_put_ss(&qp->r_sge);
191 if (!test_and_clear_bit(RVT_R_WRID_VALID, &qp->r_aflags))
192 goto bail_unlock;
193 wc.wr_id = qp->r_wr_id;
194 wc.status = IB_WC_SUCCESS;
195 wc.opcode = IB_WC_RECV;
196 wc.qp = &qp->ibqp;
197 wc.src_qp = sqp->ibqp.qp_num;
198 if (qp->ibqp.qp_type == IB_QPT_GSI || qp->ibqp.qp_type == IB_QPT_SMI) {
199 if (sqp->ibqp.qp_type == IB_QPT_GSI ||
200 sqp->ibqp.qp_type == IB_QPT_SMI)
201 wc.pkey_index = rvt_get_swqe_pkey_index(swqe);
202 else
203 wc.pkey_index = sqp->s_pkey_index;
204 } else {
205 wc.pkey_index = 0;
206 }
207 wc.slid = (ppd->lid | (rdma_ah_get_path_bits(ah_attr) &
208 ((1 << ppd->lmc) - 1))) & U16_MAX;
209 /* Check for loopback when the port lid is not set */
210 if (wc.slid == 0 && sqp->ibqp.qp_type == IB_QPT_GSI)
211 wc.slid = be16_to_cpu(IB_LID_PERMISSIVE);
212 wc.sl = rdma_ah_get_sl(ah_attr);
213 wc.dlid_path_bits = rdma_ah_get_dlid(ah_attr) & ((1 << ppd->lmc) - 1);
214 wc.port_num = qp->port_num;
215 /* Signal completion event if the solicited bit is set. */
216 rvt_recv_cq(qp, &wc, swqe->wr.send_flags & IB_SEND_SOLICITED);
217 ibp->rvp.n_loop_pkts++;
218bail_unlock:
219 spin_unlock_irqrestore(&qp->r_lock, flags);
220drop:
221 rcu_read_unlock();
222}
223
224static void hfi1_make_bth_deth(struct rvt_qp *qp, struct rvt_swqe *wqe,
225 struct ib_other_headers *ohdr,
226 u16 *pkey, u32 extra_bytes, bool bypass)
227{
228 u32 bth0;
229 struct hfi1_ibport *ibp;
230
231 ibp = to_iport(qp->ibqp.device, qp->port_num);
232 if (wqe->wr.opcode == IB_WR_SEND_WITH_IMM) {
233 ohdr->u.ud.imm_data = wqe->wr.ex.imm_data;
234 bth0 = IB_OPCODE_UD_SEND_ONLY_WITH_IMMEDIATE << 24;
235 } else {
236 bth0 = IB_OPCODE_UD_SEND_ONLY << 24;
237 }
238
239 if (wqe->wr.send_flags & IB_SEND_SOLICITED)
240 bth0 |= IB_BTH_SOLICITED;
241 bth0 |= extra_bytes << 20;
242 if (qp->ibqp.qp_type == IB_QPT_GSI || qp->ibqp.qp_type == IB_QPT_SMI)
243 *pkey = hfi1_get_pkey(ibp, rvt_get_swqe_pkey_index(wqe));
244 else
245 *pkey = hfi1_get_pkey(ibp, qp->s_pkey_index);
246 if (!bypass)
247 bth0 |= *pkey;
248 ohdr->bth[0] = cpu_to_be32(bth0);
249 ohdr->bth[1] = cpu_to_be32(rvt_get_swqe_remote_qpn(wqe));
250 ohdr->bth[2] = cpu_to_be32(mask_psn(wqe->psn));
251 /*
252 * Qkeys with the high order bit set mean use the
253 * qkey from the QP context instead of the WR (see 10.2.5).
254 */
255 ohdr->u.ud.deth[0] =
256 cpu_to_be32((int)rvt_get_swqe_remote_qkey(wqe) < 0 ? qp->qkey :
257 rvt_get_swqe_remote_qkey(wqe));
258 ohdr->u.ud.deth[1] = cpu_to_be32(qp->ibqp.qp_num);
259}
260
261void hfi1_make_ud_req_9B(struct rvt_qp *qp, struct hfi1_pkt_state *ps,
262 struct rvt_swqe *wqe)
263{
264 u32 nwords, extra_bytes;
265 u16 len, slid, dlid, pkey;
266 u16 lrh0 = 0;
267 u8 sc5;
268 struct hfi1_qp_priv *priv = qp->priv;
269 struct ib_other_headers *ohdr;
270 struct rdma_ah_attr *ah_attr;
271 struct hfi1_pportdata *ppd;
272 struct hfi1_ibport *ibp;
273 struct ib_grh *grh;
274
275 ibp = to_iport(qp->ibqp.device, qp->port_num);
276 ppd = ppd_from_ibp(ibp);
277 ah_attr = rvt_get_swqe_ah_attr(wqe);
278
279 extra_bytes = -wqe->length & 3;
280 nwords = ((wqe->length + extra_bytes) >> 2) + SIZE_OF_CRC;
281 /* header size in dwords LRH+BTH+DETH = (8+12+8)/4. */
282 ps->s_txreq->hdr_dwords = 7;
283 if (wqe->wr.opcode == IB_WR_SEND_WITH_IMM)
284 ps->s_txreq->hdr_dwords++;
285
286 if (rdma_ah_get_ah_flags(ah_attr) & IB_AH_GRH) {
287 grh = &ps->s_txreq->phdr.hdr.ibh.u.l.grh;
288 ps->s_txreq->hdr_dwords +=
289 hfi1_make_grh(ibp, grh, rdma_ah_read_grh(ah_attr),
290 ps->s_txreq->hdr_dwords - LRH_9B_DWORDS,
291 nwords);
292 lrh0 = HFI1_LRH_GRH;
293 ohdr = &ps->s_txreq->phdr.hdr.ibh.u.l.oth;
294 } else {
295 lrh0 = HFI1_LRH_BTH;
296 ohdr = &ps->s_txreq->phdr.hdr.ibh.u.oth;
297 }
298
299 sc5 = ibp->sl_to_sc[rdma_ah_get_sl(ah_attr)];
300 lrh0 |= (rdma_ah_get_sl(ah_attr) & 0xf) << 4;
301 if (qp->ibqp.qp_type == IB_QPT_SMI) {
302 lrh0 |= 0xF000; /* Set VL (see ch. 13.5.3.1) */
303 priv->s_sc = 0xf;
304 } else {
305 lrh0 |= (sc5 & 0xf) << 12;
306 priv->s_sc = sc5;
307 }
308
309 dlid = opa_get_lid(rdma_ah_get_dlid(ah_attr), 9B);
310 if (dlid == be16_to_cpu(IB_LID_PERMISSIVE)) {
311 slid = be16_to_cpu(IB_LID_PERMISSIVE);
312 } else {
313 u16 lid = (u16)ppd->lid;
314
315 if (lid) {
316 lid |= rdma_ah_get_path_bits(ah_attr) &
317 ((1 << ppd->lmc) - 1);
318 slid = lid;
319 } else {
320 slid = be16_to_cpu(IB_LID_PERMISSIVE);
321 }
322 }
323 hfi1_make_bth_deth(qp, wqe, ohdr, &pkey, extra_bytes, false);
324 len = ps->s_txreq->hdr_dwords + nwords;
325
326 /* Setup the packet */
327 ps->s_txreq->phdr.hdr.hdr_type = HFI1_PKT_TYPE_9B;
328 hfi1_make_ib_hdr(&ps->s_txreq->phdr.hdr.ibh,
329 lrh0, len, dlid, slid);
330}
331
332void hfi1_make_ud_req_16B(struct rvt_qp *qp, struct hfi1_pkt_state *ps,
333 struct rvt_swqe *wqe)
334{
335 struct hfi1_qp_priv *priv = qp->priv;
336 struct ib_other_headers *ohdr;
337 struct rdma_ah_attr *ah_attr;
338 struct hfi1_pportdata *ppd;
339 struct hfi1_ibport *ibp;
340 u32 dlid, slid, nwords, extra_bytes;
341 u32 dest_qp = rvt_get_swqe_remote_qpn(wqe);
342 u32 src_qp = qp->ibqp.qp_num;
343 u16 len, pkey;
344 u8 l4, sc5;
345 bool is_mgmt = false;
346
347 ibp = to_iport(qp->ibqp.device, qp->port_num);
348 ppd = ppd_from_ibp(ibp);
349 ah_attr = rvt_get_swqe_ah_attr(wqe);
350
351 /*
352 * Build 16B Management Packet if either the destination
353 * or source queue pair number is 0 or 1.
354 */
355 if (dest_qp == 0 || src_qp == 0 || dest_qp == 1 || src_qp == 1) {
356 /* header size in dwords 16B LRH+L4_FM = (16+8)/4. */
357 ps->s_txreq->hdr_dwords = 6;
358 is_mgmt = true;
359 } else {
360 /* header size in dwords 16B LRH+BTH+DETH = (16+12+8)/4. */
361 ps->s_txreq->hdr_dwords = 9;
362 if (wqe->wr.opcode == IB_WR_SEND_WITH_IMM)
363 ps->s_txreq->hdr_dwords++;
364 }
365
366 /* SW provides space for CRC and LT for bypass packets. */
367 extra_bytes = hfi1_get_16b_padding((ps->s_txreq->hdr_dwords << 2),
368 wqe->length);
369 nwords = ((wqe->length + extra_bytes + SIZE_OF_LT) >> 2) + SIZE_OF_CRC;
370
371 if ((rdma_ah_get_ah_flags(ah_attr) & IB_AH_GRH) &&
372 hfi1_check_mcast(rdma_ah_get_dlid(ah_attr))) {
373 struct ib_grh *grh;
374 struct ib_global_route *grd = rdma_ah_retrieve_grh(ah_attr);
375 /*
376 * Ensure OPA GIDs are transformed to IB gids
377 * before creating the GRH.
378 */
379 if (grd->sgid_index == OPA_GID_INDEX) {
380 dd_dev_warn(ppd->dd, "Bad sgid_index. sgid_index: %d\n",
381 grd->sgid_index);
382 grd->sgid_index = 0;
383 }
384 grh = &ps->s_txreq->phdr.hdr.opah.u.l.grh;
385 ps->s_txreq->hdr_dwords += hfi1_make_grh(
386 ibp, grh, grd,
387 ps->s_txreq->hdr_dwords - LRH_16B_DWORDS,
388 nwords);
389 ohdr = &ps->s_txreq->phdr.hdr.opah.u.l.oth;
390 l4 = OPA_16B_L4_IB_GLOBAL;
391 } else {
392 ohdr = &ps->s_txreq->phdr.hdr.opah.u.oth;
393 l4 = OPA_16B_L4_IB_LOCAL;
394 }
395
396 sc5 = ibp->sl_to_sc[rdma_ah_get_sl(ah_attr)];
397 if (qp->ibqp.qp_type == IB_QPT_SMI)
398 priv->s_sc = 0xf;
399 else
400 priv->s_sc = sc5;
401
402 dlid = opa_get_lid(rdma_ah_get_dlid(ah_attr), 16B);
403 if (!ppd->lid)
404 slid = be32_to_cpu(OPA_LID_PERMISSIVE);
405 else
406 slid = ppd->lid | (rdma_ah_get_path_bits(ah_attr) &
407 ((1 << ppd->lmc) - 1));
408
409 if (is_mgmt) {
410 l4 = OPA_16B_L4_FM;
411 pkey = hfi1_get_pkey(ibp, rvt_get_swqe_pkey_index(wqe));
412 hfi1_16B_set_qpn(&ps->s_txreq->phdr.hdr.opah.u.mgmt,
413 dest_qp, src_qp);
414 } else {
415 hfi1_make_bth_deth(qp, wqe, ohdr, &pkey, extra_bytes, true);
416 }
417 /* Convert dwords to flits */
418 len = (ps->s_txreq->hdr_dwords + nwords) >> 1;
419
420 /* Setup the packet */
421 ps->s_txreq->phdr.hdr.hdr_type = HFI1_PKT_TYPE_16B;
422 hfi1_make_16b_hdr(&ps->s_txreq->phdr.hdr.opah,
423 slid, dlid, len, pkey, 0, 0, l4, priv->s_sc);
424}
425
426/**
427 * hfi1_make_ud_req - construct a UD request packet
428 * @qp: the QP
429 * @ps: the current packet state
430 *
431 * Assume s_lock is held.
432 *
433 * Return 1 if constructed; otherwise, return 0.
434 */
435int hfi1_make_ud_req(struct rvt_qp *qp, struct hfi1_pkt_state *ps)
436{
437 struct hfi1_qp_priv *priv = qp->priv;
438 struct rdma_ah_attr *ah_attr;
439 struct hfi1_pportdata *ppd;
440 struct hfi1_ibport *ibp;
441 struct rvt_swqe *wqe;
442 int next_cur;
443 u32 lid;
444
445 ps->s_txreq = get_txreq(ps->dev, qp);
446 if (!ps->s_txreq)
447 goto bail_no_tx;
448
449 if (!(ib_rvt_state_ops[qp->state] & RVT_PROCESS_NEXT_SEND_OK)) {
450 if (!(ib_rvt_state_ops[qp->state] & RVT_FLUSH_SEND))
451 goto bail;
452 /* We are in the error state, flush the work request. */
453 if (qp->s_last == READ_ONCE(qp->s_head))
454 goto bail;
455 /* If DMAs are in progress, we can't flush immediately. */
456 if (iowait_sdma_pending(&priv->s_iowait)) {
457 qp->s_flags |= RVT_S_WAIT_DMA;
458 goto bail;
459 }
460 wqe = rvt_get_swqe_ptr(qp, qp->s_last);
461 rvt_send_complete(qp, wqe, IB_WC_WR_FLUSH_ERR);
462 goto done_free_tx;
463 }
464
465 /* see post_one_send() */
466 if (qp->s_cur == READ_ONCE(qp->s_head))
467 goto bail;
468
469 wqe = rvt_get_swqe_ptr(qp, qp->s_cur);
470 next_cur = qp->s_cur + 1;
471 if (next_cur >= qp->s_size)
472 next_cur = 0;
473
474 /* Construct the header. */
475 ibp = to_iport(qp->ibqp.device, qp->port_num);
476 ppd = ppd_from_ibp(ibp);
477 ah_attr = rvt_get_swqe_ah_attr(wqe);
478 priv->hdr_type = hfi1_get_hdr_type(ppd->lid, ah_attr);
479 if ((!hfi1_check_mcast(rdma_ah_get_dlid(ah_attr))) ||
480 (rdma_ah_get_dlid(ah_attr) == be32_to_cpu(OPA_LID_PERMISSIVE))) {
481 lid = rdma_ah_get_dlid(ah_attr) & ~((1 << ppd->lmc) - 1);
482 if (unlikely(!loopback &&
483 ((lid == ppd->lid) ||
484 ((lid == be32_to_cpu(OPA_LID_PERMISSIVE)) &&
485 (qp->ibqp.qp_type == IB_QPT_GSI))))) {
486 unsigned long tflags = ps->flags;
487 /*
488 * If DMAs are in progress, we can't generate
489 * a completion for the loopback packet since
490 * it would be out of order.
491 * Instead of waiting, we could queue a
492 * zero length descriptor so we get a callback.
493 */
494 if (iowait_sdma_pending(&priv->s_iowait)) {
495 qp->s_flags |= RVT_S_WAIT_DMA;
496 goto bail;
497 }
498 qp->s_cur = next_cur;
499 spin_unlock_irqrestore(&qp->s_lock, tflags);
500 ud_loopback(qp, wqe);
501 spin_lock_irqsave(&qp->s_lock, tflags);
502 ps->flags = tflags;
503 rvt_send_complete(qp, wqe, IB_WC_SUCCESS);
504 goto done_free_tx;
505 }
506 }
507
508 qp->s_cur = next_cur;
509 ps->s_txreq->s_cur_size = wqe->length;
510 ps->s_txreq->ss = &qp->s_sge;
511 qp->s_srate = rdma_ah_get_static_rate(ah_attr);
512 qp->srate_mbps = ib_rate_to_mbps(qp->s_srate);
513 qp->s_wqe = wqe;
514 qp->s_sge.sge = wqe->sg_list[0];
515 qp->s_sge.sg_list = wqe->sg_list + 1;
516 qp->s_sge.num_sge = wqe->wr.num_sge;
517 qp->s_sge.total_len = wqe->length;
518
519 /* Make the appropriate header */
520 hfi1_make_ud_req_tbl[priv->hdr_type](qp, ps, qp->s_wqe);
521 priv->s_sde = qp_to_sdma_engine(qp, priv->s_sc);
522 ps->s_txreq->sde = priv->s_sde;
523 priv->s_sendcontext = qp_to_send_context(qp, priv->s_sc);
524 ps->s_txreq->psc = priv->s_sendcontext;
525 /* disarm any ahg */
526 priv->s_ahg->ahgcount = 0;
527 priv->s_ahg->ahgidx = 0;
528 priv->s_ahg->tx_flags = 0;
529
530 return 1;
531
532done_free_tx:
533 hfi1_put_txreq(ps->s_txreq);
534 ps->s_txreq = NULL;
535 return 1;
536
537bail:
538 hfi1_put_txreq(ps->s_txreq);
539
540bail_no_tx:
541 ps->s_txreq = NULL;
542 qp->s_flags &= ~RVT_S_BUSY;
543 return 0;
544}
545
546/*
547 * Hardware can't check this so we do it here.
548 *
549 * This is a slightly different algorithm than the standard pkey check. It
550 * special cases the management keys and allows for 0x7fff and 0xffff to be in
551 * the table at the same time.
552 *
553 * @returns the index found or -1 if not found
554 */
555int hfi1_lookup_pkey_idx(struct hfi1_ibport *ibp, u16 pkey)
556{
557 struct hfi1_pportdata *ppd = ppd_from_ibp(ibp);
558 unsigned i;
559
560 if (pkey == FULL_MGMT_P_KEY || pkey == LIM_MGMT_P_KEY) {
561 unsigned lim_idx = -1;
562
563 for (i = 0; i < ARRAY_SIZE(ppd->pkeys); ++i) {
564 /* here we look for an exact match */
565 if (ppd->pkeys[i] == pkey)
566 return i;
567 if (ppd->pkeys[i] == LIM_MGMT_P_KEY)
568 lim_idx = i;
569 }
570
571 /* did not find 0xffff return 0x7fff idx if found */
572 if (pkey == FULL_MGMT_P_KEY)
573 return lim_idx;
574
575 /* no match... */
576 return -1;
577 }
578
579 pkey &= 0x7fff; /* remove limited/full membership bit */
580
581 for (i = 0; i < ARRAY_SIZE(ppd->pkeys); ++i)
582 if ((ppd->pkeys[i] & 0x7fff) == pkey)
583 return i;
584
585 /*
586 * Should not get here, this means hardware failed to validate pkeys.
587 */
588 return -1;
589}
590
591void return_cnp_16B(struct hfi1_ibport *ibp, struct rvt_qp *qp,
592 u32 remote_qpn, u16 pkey, u32 slid, u32 dlid,
593 u8 sc5, const struct ib_grh *old_grh)
594{
595 u64 pbc, pbc_flags = 0;
596 u32 bth0, plen, vl, hwords = 7;
597 u16 len;
598 u8 l4;
599 struct hfi1_opa_header hdr;
600 struct ib_other_headers *ohdr;
601 struct pio_buf *pbuf;
602 struct send_context *ctxt = qp_to_send_context(qp, sc5);
603 struct hfi1_pportdata *ppd = ppd_from_ibp(ibp);
604 u32 nwords;
605
606 hdr.hdr_type = HFI1_PKT_TYPE_16B;
607 /* Populate length */
608 nwords = ((hfi1_get_16b_padding(hwords << 2, 0) +
609 SIZE_OF_LT) >> 2) + SIZE_OF_CRC;
610 if (old_grh) {
611 struct ib_grh *grh = &hdr.opah.u.l.grh;
612
613 grh->version_tclass_flow = old_grh->version_tclass_flow;
614 grh->paylen = cpu_to_be16(
615 (hwords - LRH_16B_DWORDS + nwords) << 2);
616 grh->hop_limit = 0xff;
617 grh->sgid = old_grh->dgid;
618 grh->dgid = old_grh->sgid;
619 ohdr = &hdr.opah.u.l.oth;
620 l4 = OPA_16B_L4_IB_GLOBAL;
621 hwords += sizeof(struct ib_grh) / sizeof(u32);
622 } else {
623 ohdr = &hdr.opah.u.oth;
624 l4 = OPA_16B_L4_IB_LOCAL;
625 }
626
627 /* BIT 16 to 19 is TVER. Bit 20 to 22 is pad cnt */
628 bth0 = (IB_OPCODE_CNP << 24) | (1 << 16) |
629 (hfi1_get_16b_padding(hwords << 2, 0) << 20);
630 ohdr->bth[0] = cpu_to_be32(bth0);
631
632 ohdr->bth[1] = cpu_to_be32(remote_qpn);
633 ohdr->bth[2] = 0; /* PSN 0 */
634
635 /* Convert dwords to flits */
636 len = (hwords + nwords) >> 1;
637 hfi1_make_16b_hdr(&hdr.opah, slid, dlid, len, pkey, 1, 0, l4, sc5);
638
639 plen = 2 /* PBC */ + hwords + nwords;
640 pbc_flags |= PBC_PACKET_BYPASS | PBC_INSERT_BYPASS_ICRC;
641 vl = sc_to_vlt(ppd->dd, sc5);
642 pbc = create_pbc(ppd, pbc_flags, qp->srate_mbps, vl, plen);
643 if (ctxt) {
644 pbuf = sc_buffer_alloc(ctxt, plen, NULL, NULL);
645 if (!IS_ERR_OR_NULL(pbuf)) {
646 trace_pio_output_ibhdr(ppd->dd, &hdr, sc5);
647 ppd->dd->pio_inline_send(ppd->dd, pbuf, pbc,
648 &hdr, hwords);
649 }
650 }
651}
652
653void return_cnp(struct hfi1_ibport *ibp, struct rvt_qp *qp, u32 remote_qpn,
654 u16 pkey, u32 slid, u32 dlid, u8 sc5,
655 const struct ib_grh *old_grh)
656{
657 u64 pbc, pbc_flags = 0;
658 u32 bth0, plen, vl, hwords = 5;
659 u16 lrh0;
660 u8 sl = ibp->sc_to_sl[sc5];
661 struct hfi1_opa_header hdr;
662 struct ib_other_headers *ohdr;
663 struct pio_buf *pbuf;
664 struct send_context *ctxt = qp_to_send_context(qp, sc5);
665 struct hfi1_pportdata *ppd = ppd_from_ibp(ibp);
666
667 hdr.hdr_type = HFI1_PKT_TYPE_9B;
668 if (old_grh) {
669 struct ib_grh *grh = &hdr.ibh.u.l.grh;
670
671 grh->version_tclass_flow = old_grh->version_tclass_flow;
672 grh->paylen = cpu_to_be16(
673 (hwords - LRH_9B_DWORDS + SIZE_OF_CRC) << 2);
674 grh->hop_limit = 0xff;
675 grh->sgid = old_grh->dgid;
676 grh->dgid = old_grh->sgid;
677 ohdr = &hdr.ibh.u.l.oth;
678 lrh0 = HFI1_LRH_GRH;
679 hwords += sizeof(struct ib_grh) / sizeof(u32);
680 } else {
681 ohdr = &hdr.ibh.u.oth;
682 lrh0 = HFI1_LRH_BTH;
683 }
684
685 lrh0 |= (sc5 & 0xf) << 12 | sl << 4;
686
687 bth0 = pkey | (IB_OPCODE_CNP << 24);
688 ohdr->bth[0] = cpu_to_be32(bth0);
689
690 ohdr->bth[1] = cpu_to_be32(remote_qpn | (1 << IB_BECN_SHIFT));
691 ohdr->bth[2] = 0; /* PSN 0 */
692
693 hfi1_make_ib_hdr(&hdr.ibh, lrh0, hwords + SIZE_OF_CRC, dlid, slid);
694 plen = 2 /* PBC */ + hwords;
695 pbc_flags |= (ib_is_sc5(sc5) << PBC_DC_INFO_SHIFT);
696 vl = sc_to_vlt(ppd->dd, sc5);
697 pbc = create_pbc(ppd, pbc_flags, qp->srate_mbps, vl, plen);
698 if (ctxt) {
699 pbuf = sc_buffer_alloc(ctxt, plen, NULL, NULL);
700 if (!IS_ERR_OR_NULL(pbuf)) {
701 trace_pio_output_ibhdr(ppd->dd, &hdr, sc5);
702 ppd->dd->pio_inline_send(ppd->dd, pbuf, pbc,
703 &hdr, hwords);
704 }
705 }
706}
707
708/*
709 * opa_smp_check() - Do the regular pkey checking, and the additional
710 * checks for SMPs specified in OPAv1 rev 1.0, 9/19/2016 update, section
711 * 9.10.25 ("SMA Packet Checks").
712 *
713 * Note that:
714 * - Checks are done using the pkey directly from the packet's BTH,
715 * and specifically _not_ the pkey that we attach to the completion,
716 * which may be different.
717 * - These checks are specifically for "non-local" SMPs (i.e., SMPs
718 * which originated on another node). SMPs which are sent from, and
719 * destined to this node are checked in opa_local_smp_check().
720 *
721 * At the point where opa_smp_check() is called, we know:
722 * - destination QP is QP0
723 *
724 * opa_smp_check() returns 0 if all checks succeed, 1 otherwise.
725 */
726static int opa_smp_check(struct hfi1_ibport *ibp, u16 pkey, u8 sc5,
727 struct rvt_qp *qp, u16 slid, struct opa_smp *smp)
728{
729 struct hfi1_pportdata *ppd = ppd_from_ibp(ibp);
730
731 /*
732 * I don't think it's possible for us to get here with sc != 0xf,
733 * but check it to be certain.
734 */
735 if (sc5 != 0xf)
736 return 1;
737
738 if (rcv_pkey_check(ppd, pkey, sc5, slid))
739 return 1;
740
741 /*
742 * At this point we know (and so don't need to check again) that
743 * the pkey is either LIM_MGMT_P_KEY, or FULL_MGMT_P_KEY
744 * (see ingress_pkey_check).
745 */
746 if (smp->mgmt_class != IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE &&
747 smp->mgmt_class != IB_MGMT_CLASS_SUBN_LID_ROUTED) {
748 ingress_pkey_table_fail(ppd, pkey, slid);
749 return 1;
750 }
751
752 /*
753 * SMPs fall into one of four (disjoint) categories:
754 * SMA request, SMA response, SMA trap, or SMA trap repress.
755 * Our response depends, in part, on which type of SMP we're
756 * processing.
757 *
758 * If this is an SMA response, skip the check here.
759 *
760 * If this is an SMA request or SMA trap repress:
761 * - pkey != FULL_MGMT_P_KEY =>
762 * increment port recv constraint errors, drop MAD
763 *
764 * Otherwise:
765 * - accept if the port is running an SM
766 * - drop MAD if it's an SMA trap
767 * - pkey == FULL_MGMT_P_KEY =>
768 * reply with unsupported method
769 * - pkey != FULL_MGMT_P_KEY =>
770 * increment port recv constraint errors, drop MAD
771 */
772 switch (smp->method) {
773 case IB_MGMT_METHOD_GET_RESP:
774 case IB_MGMT_METHOD_REPORT_RESP:
775 break;
776 case IB_MGMT_METHOD_GET:
777 case IB_MGMT_METHOD_SET:
778 case IB_MGMT_METHOD_REPORT:
779 case IB_MGMT_METHOD_TRAP_REPRESS:
780 if (pkey != FULL_MGMT_P_KEY) {
781 ingress_pkey_table_fail(ppd, pkey, slid);
782 return 1;
783 }
784 break;
785 default:
786 if (ibp->rvp.port_cap_flags & IB_PORT_SM)
787 return 0;
788 if (smp->method == IB_MGMT_METHOD_TRAP)
789 return 1;
790 if (pkey == FULL_MGMT_P_KEY) {
791 smp->status |= IB_SMP_UNSUP_METHOD;
792 return 0;
793 }
794 ingress_pkey_table_fail(ppd, pkey, slid);
795 return 1;
796 }
797 return 0;
798}
799
800/**
801 * hfi1_ud_rcv - receive an incoming UD packet
802 * @packet: the packet structure
803 *
804 * This is called from qp_rcv() to process an incoming UD packet
805 * for the given QP.
806 * Called at interrupt level.
807 */
808void hfi1_ud_rcv(struct hfi1_packet *packet)
809{
810 u32 hdrsize = packet->hlen;
811 struct ib_wc wc;
812 u32 src_qp;
813 u16 pkey;
814 int mgmt_pkey_idx = -1;
815 struct hfi1_ibport *ibp = rcd_to_iport(packet->rcd);
816 struct hfi1_pportdata *ppd = ppd_from_ibp(ibp);
817 void *data = packet->payload;
818 u32 tlen = packet->tlen;
819 struct rvt_qp *qp = packet->qp;
820 u8 sc5 = packet->sc;
821 u8 sl_from_sc;
822 u8 opcode = packet->opcode;
823 u8 sl = packet->sl;
824 u32 dlid = packet->dlid;
825 u32 slid = packet->slid;
826 u8 extra_bytes;
827 u8 l4 = 0;
828 bool dlid_is_permissive;
829 bool slid_is_permissive;
830 bool solicited = false;
831
832 extra_bytes = packet->pad + packet->extra_byte + (SIZE_OF_CRC << 2);
833
834 if (packet->etype == RHF_RCV_TYPE_BYPASS) {
835 u32 permissive_lid =
836 opa_get_lid(be32_to_cpu(OPA_LID_PERMISSIVE), 16B);
837
838 l4 = hfi1_16B_get_l4(packet->hdr);
839 pkey = hfi1_16B_get_pkey(packet->hdr);
840 dlid_is_permissive = (dlid == permissive_lid);
841 slid_is_permissive = (slid == permissive_lid);
842 } else {
843 pkey = ib_bth_get_pkey(packet->ohdr);
844 dlid_is_permissive = (dlid == be16_to_cpu(IB_LID_PERMISSIVE));
845 slid_is_permissive = (slid == be16_to_cpu(IB_LID_PERMISSIVE));
846 }
847 sl_from_sc = ibp->sc_to_sl[sc5];
848
849 if (likely(l4 != OPA_16B_L4_FM)) {
850 src_qp = ib_get_sqpn(packet->ohdr);
851 solicited = ib_bth_is_solicited(packet->ohdr);
852 } else {
853 src_qp = hfi1_16B_get_src_qpn(packet->mgmt);
854 }
855
856 process_ecn(qp, packet);
857 /*
858 * Get the number of bytes the message was padded by
859 * and drop incomplete packets.
860 */
861 if (unlikely(tlen < (hdrsize + extra_bytes)))
862 goto drop;
863
864 tlen -= hdrsize + extra_bytes;
865
866 /*
867 * Check that the permissive LID is only used on QP0
868 * and the QKEY matches (see 9.6.1.4.1 and 9.6.1.5.1).
869 */
870 if (qp->ibqp.qp_num) {
871 if (unlikely(dlid_is_permissive || slid_is_permissive))
872 goto drop;
873 if (qp->ibqp.qp_num > 1) {
874 if (unlikely(rcv_pkey_check(ppd, pkey, sc5, slid))) {
875 /*
876 * Traps will not be sent for packets dropped
877 * by the HW. This is fine, as sending trap
878 * for invalid pkeys is optional according to
879 * IB spec (release 1.3, section 10.9.4)
880 */
881 hfi1_bad_pkey(ibp,
882 pkey, sl,
883 src_qp, qp->ibqp.qp_num,
884 slid, dlid);
885 return;
886 }
887 } else {
888 /* GSI packet */
889 mgmt_pkey_idx = hfi1_lookup_pkey_idx(ibp, pkey);
890 if (mgmt_pkey_idx < 0)
891 goto drop;
892 }
893 if (unlikely(l4 != OPA_16B_L4_FM &&
894 ib_get_qkey(packet->ohdr) != qp->qkey))
895 return; /* Silent drop */
896
897 /* Drop invalid MAD packets (see 13.5.3.1). */
898 if (unlikely(qp->ibqp.qp_num == 1 &&
899 (tlen > 2048 || (sc5 == 0xF))))
900 goto drop;
901 } else {
902 /* Received on QP0, and so by definition, this is an SMP */
903 struct opa_smp *smp = (struct opa_smp *)data;
904
905 if (opa_smp_check(ibp, pkey, sc5, qp, slid, smp))
906 goto drop;
907
908 if (tlen > 2048)
909 goto drop;
910 if ((dlid_is_permissive || slid_is_permissive) &&
911 smp->mgmt_class != IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
912 goto drop;
913
914 /* look up SMI pkey */
915 mgmt_pkey_idx = hfi1_lookup_pkey_idx(ibp, pkey);
916 if (mgmt_pkey_idx < 0)
917 goto drop;
918 }
919
920 if (qp->ibqp.qp_num > 1 &&
921 opcode == IB_OPCODE_UD_SEND_ONLY_WITH_IMMEDIATE) {
922 wc.ex.imm_data = packet->ohdr->u.ud.imm_data;
923 wc.wc_flags = IB_WC_WITH_IMM;
924 } else if (opcode == IB_OPCODE_UD_SEND_ONLY) {
925 wc.ex.imm_data = 0;
926 wc.wc_flags = 0;
927 } else {
928 goto drop;
929 }
930
931 /*
932 * A GRH is expected to precede the data even if not
933 * present on the wire.
934 */
935 wc.byte_len = tlen + sizeof(struct ib_grh);
936
937 /*
938 * Get the next work request entry to find where to put the data.
939 */
940 if (qp->r_flags & RVT_R_REUSE_SGE) {
941 qp->r_flags &= ~RVT_R_REUSE_SGE;
942 } else {
943 int ret;
944
945 ret = rvt_get_rwqe(qp, false);
946 if (ret < 0) {
947 rvt_rc_error(qp, IB_WC_LOC_QP_OP_ERR);
948 return;
949 }
950 if (!ret) {
951 if (qp->ibqp.qp_num == 0)
952 ibp->rvp.n_vl15_dropped++;
953 return;
954 }
955 }
956 /* Silently drop packets which are too big. */
957 if (unlikely(wc.byte_len > qp->r_len)) {
958 qp->r_flags |= RVT_R_REUSE_SGE;
959 goto drop;
960 }
961 if (packet->grh) {
962 rvt_copy_sge(qp, &qp->r_sge, packet->grh,
963 sizeof(struct ib_grh), true, false);
964 wc.wc_flags |= IB_WC_GRH;
965 } else if (packet->etype == RHF_RCV_TYPE_BYPASS) {
966 struct ib_grh grh;
967 /*
968 * Assuming we only created 16B on the send side
969 * if we want to use large LIDs, since GRH was stripped
970 * out when creating 16B, add back the GRH here.
971 */
972 hfi1_make_ext_grh(packet, &grh, slid, dlid);
973 rvt_copy_sge(qp, &qp->r_sge, &grh,
974 sizeof(struct ib_grh), true, false);
975 wc.wc_flags |= IB_WC_GRH;
976 } else {
977 rvt_skip_sge(&qp->r_sge, sizeof(struct ib_grh), true);
978 }
979 rvt_copy_sge(qp, &qp->r_sge, data, wc.byte_len - sizeof(struct ib_grh),
980 true, false);
981 rvt_put_ss(&qp->r_sge);
982 if (!test_and_clear_bit(RVT_R_WRID_VALID, &qp->r_aflags))
983 return;
984 wc.wr_id = qp->r_wr_id;
985 wc.status = IB_WC_SUCCESS;
986 wc.opcode = IB_WC_RECV;
987 wc.vendor_err = 0;
988 wc.qp = &qp->ibqp;
989 wc.src_qp = src_qp;
990
991 if (qp->ibqp.qp_type == IB_QPT_GSI ||
992 qp->ibqp.qp_type == IB_QPT_SMI) {
993 if (mgmt_pkey_idx < 0) {
994 if (net_ratelimit()) {
995 struct hfi1_devdata *dd = ppd->dd;
996
997 dd_dev_err(dd, "QP type %d mgmt_pkey_idx < 0 and packet not dropped???\n",
998 qp->ibqp.qp_type);
999 mgmt_pkey_idx = 0;
1000 }
1001 }
1002 wc.pkey_index = (unsigned)mgmt_pkey_idx;
1003 } else {
1004 wc.pkey_index = 0;
1005 }
1006 if (slid_is_permissive)
1007 slid = be32_to_cpu(OPA_LID_PERMISSIVE);
1008 wc.slid = slid & U16_MAX;
1009 wc.sl = sl_from_sc;
1010
1011 /*
1012 * Save the LMC lower bits if the destination LID is a unicast LID.
1013 */
1014 wc.dlid_path_bits = hfi1_check_mcast(dlid) ? 0 :
1015 dlid & ((1 << ppd_from_ibp(ibp)->lmc) - 1);
1016 wc.port_num = qp->port_num;
1017 /* Signal completion event if the solicited bit is set. */
1018 rvt_recv_cq(qp, &wc, solicited);
1019 return;
1020
1021drop:
1022 ibp->rvp.n_pkt_drops++;
1023}
1/*
2 * Copyright(c) 2015, 2016 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/net.h>
49#include <rdma/ib_smi.h>
50
51#include "hfi.h"
52#include "mad.h"
53#include "verbs_txreq.h"
54#include "qp.h"
55
56/* We support only two types - 9B and 16B for now */
57static const hfi1_make_req hfi1_make_ud_req_tbl[2] = {
58 [HFI1_PKT_TYPE_9B] = &hfi1_make_ud_req_9B,
59 [HFI1_PKT_TYPE_16B] = &hfi1_make_ud_req_16B
60};
61
62/**
63 * ud_loopback - handle send on loopback QPs
64 * @sqp: the sending QP
65 * @swqe: the send work request
66 *
67 * This is called from hfi1_make_ud_req() to forward a WQE addressed
68 * to the same HFI.
69 * Note that the receive interrupt handler may be calling hfi1_ud_rcv()
70 * while this is being called.
71 */
72static void ud_loopback(struct rvt_qp *sqp, struct rvt_swqe *swqe)
73{
74 struct hfi1_ibport *ibp = to_iport(sqp->ibqp.device, sqp->port_num);
75 struct hfi1_pportdata *ppd;
76 struct hfi1_qp_priv *priv = sqp->priv;
77 struct rvt_qp *qp;
78 struct rdma_ah_attr *ah_attr;
79 unsigned long flags;
80 struct rvt_sge_state ssge;
81 struct rvt_sge *sge;
82 struct ib_wc wc;
83 u32 length;
84 enum ib_qp_type sqptype, dqptype;
85
86 rcu_read_lock();
87
88 qp = rvt_lookup_qpn(ib_to_rvt(sqp->ibqp.device), &ibp->rvp,
89 swqe->ud_wr.remote_qpn);
90 if (!qp) {
91 ibp->rvp.n_pkt_drops++;
92 rcu_read_unlock();
93 return;
94 }
95
96 sqptype = sqp->ibqp.qp_type == IB_QPT_GSI ?
97 IB_QPT_UD : sqp->ibqp.qp_type;
98 dqptype = qp->ibqp.qp_type == IB_QPT_GSI ?
99 IB_QPT_UD : qp->ibqp.qp_type;
100
101 if (dqptype != sqptype ||
102 !(ib_rvt_state_ops[qp->state] & RVT_PROCESS_RECV_OK)) {
103 ibp->rvp.n_pkt_drops++;
104 goto drop;
105 }
106
107 ah_attr = &ibah_to_rvtah(swqe->ud_wr.ah)->attr;
108 ppd = ppd_from_ibp(ibp);
109
110 if (qp->ibqp.qp_num > 1) {
111 u16 pkey;
112 u32 slid;
113 u8 sc5 = ibp->sl_to_sc[rdma_ah_get_sl(ah_attr)];
114
115 pkey = hfi1_get_pkey(ibp, sqp->s_pkey_index);
116 slid = ppd->lid | (rdma_ah_get_path_bits(ah_attr) &
117 ((1 << ppd->lmc) - 1));
118 if (unlikely(ingress_pkey_check(ppd, pkey, sc5,
119 qp->s_pkey_index,
120 slid, false))) {
121 hfi1_bad_pkey(ibp, pkey,
122 rdma_ah_get_sl(ah_attr),
123 sqp->ibqp.qp_num, qp->ibqp.qp_num,
124 slid, rdma_ah_get_dlid(ah_attr));
125 goto drop;
126 }
127 }
128
129 /*
130 * Check that the qkey matches (except for QP0, see 9.6.1.4.1).
131 * Qkeys with the high order bit set mean use the
132 * qkey from the QP context instead of the WR (see 10.2.5).
133 */
134 if (qp->ibqp.qp_num) {
135 u32 qkey;
136
137 qkey = (int)swqe->ud_wr.remote_qkey < 0 ?
138 sqp->qkey : swqe->ud_wr.remote_qkey;
139 if (unlikely(qkey != qp->qkey))
140 goto drop; /* silently drop per IBTA spec */
141 }
142
143 /*
144 * A GRH is expected to precede the data even if not
145 * present on the wire.
146 */
147 length = swqe->length;
148 memset(&wc, 0, sizeof(wc));
149 wc.byte_len = length + sizeof(struct ib_grh);
150
151 if (swqe->wr.opcode == IB_WR_SEND_WITH_IMM) {
152 wc.wc_flags = IB_WC_WITH_IMM;
153 wc.ex.imm_data = swqe->wr.ex.imm_data;
154 }
155
156 spin_lock_irqsave(&qp->r_lock, flags);
157
158 /*
159 * Get the next work request entry to find where to put the data.
160 */
161 if (qp->r_flags & RVT_R_REUSE_SGE) {
162 qp->r_flags &= ~RVT_R_REUSE_SGE;
163 } else {
164 int ret;
165
166 ret = hfi1_rvt_get_rwqe(qp, 0);
167 if (ret < 0) {
168 rvt_rc_error(qp, IB_WC_LOC_QP_OP_ERR);
169 goto bail_unlock;
170 }
171 if (!ret) {
172 if (qp->ibqp.qp_num == 0)
173 ibp->rvp.n_vl15_dropped++;
174 goto bail_unlock;
175 }
176 }
177 /* Silently drop packets which are too big. */
178 if (unlikely(wc.byte_len > qp->r_len)) {
179 qp->r_flags |= RVT_R_REUSE_SGE;
180 ibp->rvp.n_pkt_drops++;
181 goto bail_unlock;
182 }
183
184 if (rdma_ah_get_ah_flags(ah_attr) & IB_AH_GRH) {
185 struct ib_grh grh;
186 struct ib_global_route grd = *(rdma_ah_read_grh(ah_attr));
187
188 /*
189 * For loopback packets with extended LIDs, the
190 * sgid_index in the GRH is 0 and the dgid is
191 * OPA GID of the sender. While creating a response
192 * to the loopback packet, IB core creates the new
193 * sgid_index from the DGID and that will be the
194 * OPA_GID_INDEX. The new dgid is from the sgid
195 * index and that will be in the IB GID format.
196 *
197 * We now have a case where the sent packet had a
198 * different sgid_index and dgid compared to the
199 * one that was received in response.
200 *
201 * Fix this inconsistency.
202 */
203 if (priv->hdr_type == HFI1_PKT_TYPE_16B) {
204 if (grd.sgid_index == 0)
205 grd.sgid_index = OPA_GID_INDEX;
206
207 if (ib_is_opa_gid(&grd.dgid))
208 grd.dgid.global.interface_id =
209 cpu_to_be64(ppd->guids[HFI1_PORT_GUID_INDEX]);
210 }
211
212 hfi1_make_grh(ibp, &grh, &grd, 0, 0);
213 hfi1_copy_sge(&qp->r_sge, &grh,
214 sizeof(grh), true, false);
215 wc.wc_flags |= IB_WC_GRH;
216 } else {
217 rvt_skip_sge(&qp->r_sge, sizeof(struct ib_grh), true);
218 }
219 ssge.sg_list = swqe->sg_list + 1;
220 ssge.sge = *swqe->sg_list;
221 ssge.num_sge = swqe->wr.num_sge;
222 sge = &ssge.sge;
223 while (length) {
224 u32 len = sge->length;
225
226 if (len > length)
227 len = length;
228 if (len > sge->sge_length)
229 len = sge->sge_length;
230 WARN_ON_ONCE(len == 0);
231 hfi1_copy_sge(&qp->r_sge, sge->vaddr, len, true, false);
232 sge->vaddr += len;
233 sge->length -= len;
234 sge->sge_length -= len;
235 if (sge->sge_length == 0) {
236 if (--ssge.num_sge)
237 *sge = *ssge.sg_list++;
238 } else if (sge->length == 0 && sge->mr->lkey) {
239 if (++sge->n >= RVT_SEGSZ) {
240 if (++sge->m >= sge->mr->mapsz)
241 break;
242 sge->n = 0;
243 }
244 sge->vaddr =
245 sge->mr->map[sge->m]->segs[sge->n].vaddr;
246 sge->length =
247 sge->mr->map[sge->m]->segs[sge->n].length;
248 }
249 length -= len;
250 }
251 rvt_put_ss(&qp->r_sge);
252 if (!test_and_clear_bit(RVT_R_WRID_VALID, &qp->r_aflags))
253 goto bail_unlock;
254 wc.wr_id = qp->r_wr_id;
255 wc.status = IB_WC_SUCCESS;
256 wc.opcode = IB_WC_RECV;
257 wc.qp = &qp->ibqp;
258 wc.src_qp = sqp->ibqp.qp_num;
259 if (qp->ibqp.qp_type == IB_QPT_GSI || qp->ibqp.qp_type == IB_QPT_SMI) {
260 if (sqp->ibqp.qp_type == IB_QPT_GSI ||
261 sqp->ibqp.qp_type == IB_QPT_SMI)
262 wc.pkey_index = swqe->ud_wr.pkey_index;
263 else
264 wc.pkey_index = sqp->s_pkey_index;
265 } else {
266 wc.pkey_index = 0;
267 }
268 wc.slid = (ppd->lid | (rdma_ah_get_path_bits(ah_attr) &
269 ((1 << ppd->lmc) - 1))) & U16_MAX;
270 /* Check for loopback when the port lid is not set */
271 if (wc.slid == 0 && sqp->ibqp.qp_type == IB_QPT_GSI)
272 wc.slid = be16_to_cpu(IB_LID_PERMISSIVE);
273 wc.sl = rdma_ah_get_sl(ah_attr);
274 wc.dlid_path_bits = rdma_ah_get_dlid(ah_attr) & ((1 << ppd->lmc) - 1);
275 wc.port_num = qp->port_num;
276 /* Signal completion event if the solicited bit is set. */
277 rvt_cq_enter(ibcq_to_rvtcq(qp->ibqp.recv_cq), &wc,
278 swqe->wr.send_flags & IB_SEND_SOLICITED);
279 ibp->rvp.n_loop_pkts++;
280bail_unlock:
281 spin_unlock_irqrestore(&qp->r_lock, flags);
282drop:
283 rcu_read_unlock();
284}
285
286static void hfi1_make_bth_deth(struct rvt_qp *qp, struct rvt_swqe *wqe,
287 struct ib_other_headers *ohdr,
288 u16 *pkey, u32 extra_bytes, bool bypass)
289{
290 u32 bth0;
291 struct hfi1_ibport *ibp;
292
293 ibp = to_iport(qp->ibqp.device, qp->port_num);
294 if (wqe->wr.opcode == IB_WR_SEND_WITH_IMM) {
295 ohdr->u.ud.imm_data = wqe->wr.ex.imm_data;
296 bth0 = IB_OPCODE_UD_SEND_ONLY_WITH_IMMEDIATE << 24;
297 } else {
298 bth0 = IB_OPCODE_UD_SEND_ONLY << 24;
299 }
300
301 if (wqe->wr.send_flags & IB_SEND_SOLICITED)
302 bth0 |= IB_BTH_SOLICITED;
303 bth0 |= extra_bytes << 20;
304 if (qp->ibqp.qp_type == IB_QPT_GSI || qp->ibqp.qp_type == IB_QPT_SMI)
305 *pkey = hfi1_get_pkey(ibp, wqe->ud_wr.pkey_index);
306 else
307 *pkey = hfi1_get_pkey(ibp, qp->s_pkey_index);
308 if (!bypass)
309 bth0 |= *pkey;
310 ohdr->bth[0] = cpu_to_be32(bth0);
311 ohdr->bth[1] = cpu_to_be32(wqe->ud_wr.remote_qpn);
312 ohdr->bth[2] = cpu_to_be32(mask_psn(wqe->psn));
313 /*
314 * Qkeys with the high order bit set mean use the
315 * qkey from the QP context instead of the WR (see 10.2.5).
316 */
317 ohdr->u.ud.deth[0] = cpu_to_be32((int)wqe->ud_wr.remote_qkey < 0 ?
318 qp->qkey : wqe->ud_wr.remote_qkey);
319 ohdr->u.ud.deth[1] = cpu_to_be32(qp->ibqp.qp_num);
320}
321
322void hfi1_make_ud_req_9B(struct rvt_qp *qp, struct hfi1_pkt_state *ps,
323 struct rvt_swqe *wqe)
324{
325 u32 nwords, extra_bytes;
326 u16 len, slid, dlid, pkey;
327 u16 lrh0 = 0;
328 u8 sc5;
329 struct hfi1_qp_priv *priv = qp->priv;
330 struct ib_other_headers *ohdr;
331 struct rdma_ah_attr *ah_attr;
332 struct hfi1_pportdata *ppd;
333 struct hfi1_ibport *ibp;
334 struct ib_grh *grh;
335
336 ibp = to_iport(qp->ibqp.device, qp->port_num);
337 ppd = ppd_from_ibp(ibp);
338 ah_attr = &ibah_to_rvtah(wqe->ud_wr.ah)->attr;
339
340 extra_bytes = -wqe->length & 3;
341 nwords = ((wqe->length + extra_bytes) >> 2) + SIZE_OF_CRC;
342 /* header size in dwords LRH+BTH+DETH = (8+12+8)/4. */
343 ps->s_txreq->hdr_dwords = 7;
344 if (wqe->wr.opcode == IB_WR_SEND_WITH_IMM)
345 ps->s_txreq->hdr_dwords++;
346
347 if (rdma_ah_get_ah_flags(ah_attr) & IB_AH_GRH) {
348 grh = &ps->s_txreq->phdr.hdr.ibh.u.l.grh;
349 ps->s_txreq->hdr_dwords +=
350 hfi1_make_grh(ibp, grh, rdma_ah_read_grh(ah_attr),
351 ps->s_txreq->hdr_dwords - LRH_9B_DWORDS,
352 nwords);
353 lrh0 = HFI1_LRH_GRH;
354 ohdr = &ps->s_txreq->phdr.hdr.ibh.u.l.oth;
355 } else {
356 lrh0 = HFI1_LRH_BTH;
357 ohdr = &ps->s_txreq->phdr.hdr.ibh.u.oth;
358 }
359
360 sc5 = ibp->sl_to_sc[rdma_ah_get_sl(ah_attr)];
361 lrh0 |= (rdma_ah_get_sl(ah_attr) & 0xf) << 4;
362 if (qp->ibqp.qp_type == IB_QPT_SMI) {
363 lrh0 |= 0xF000; /* Set VL (see ch. 13.5.3.1) */
364 priv->s_sc = 0xf;
365 } else {
366 lrh0 |= (sc5 & 0xf) << 12;
367 priv->s_sc = sc5;
368 }
369
370 dlid = opa_get_lid(rdma_ah_get_dlid(ah_attr), 9B);
371 if (dlid == be16_to_cpu(IB_LID_PERMISSIVE)) {
372 slid = be16_to_cpu(IB_LID_PERMISSIVE);
373 } else {
374 u16 lid = (u16)ppd->lid;
375
376 if (lid) {
377 lid |= rdma_ah_get_path_bits(ah_attr) &
378 ((1 << ppd->lmc) - 1);
379 slid = lid;
380 } else {
381 slid = be16_to_cpu(IB_LID_PERMISSIVE);
382 }
383 }
384 hfi1_make_bth_deth(qp, wqe, ohdr, &pkey, extra_bytes, false);
385 len = ps->s_txreq->hdr_dwords + nwords;
386
387 /* Setup the packet */
388 ps->s_txreq->phdr.hdr.hdr_type = HFI1_PKT_TYPE_9B;
389 hfi1_make_ib_hdr(&ps->s_txreq->phdr.hdr.ibh,
390 lrh0, len, dlid, slid);
391}
392
393void hfi1_make_ud_req_16B(struct rvt_qp *qp, struct hfi1_pkt_state *ps,
394 struct rvt_swqe *wqe)
395{
396 struct hfi1_qp_priv *priv = qp->priv;
397 struct ib_other_headers *ohdr;
398 struct rdma_ah_attr *ah_attr;
399 struct hfi1_pportdata *ppd;
400 struct hfi1_ibport *ibp;
401 u32 dlid, slid, nwords, extra_bytes;
402 u16 len, pkey;
403 u8 l4, sc5;
404
405 ibp = to_iport(qp->ibqp.device, qp->port_num);
406 ppd = ppd_from_ibp(ibp);
407 ah_attr = &ibah_to_rvtah(wqe->ud_wr.ah)->attr;
408 /* header size in dwords 16B LRH+BTH+DETH = (16+12+8)/4. */
409 ps->s_txreq->hdr_dwords = 9;
410 if (wqe->wr.opcode == IB_WR_SEND_WITH_IMM)
411 ps->s_txreq->hdr_dwords++;
412
413 /* SW provides space for CRC and LT for bypass packets. */
414 extra_bytes = hfi1_get_16b_padding((ps->s_txreq->hdr_dwords << 2),
415 wqe->length);
416 nwords = ((wqe->length + extra_bytes + SIZE_OF_LT) >> 2) + SIZE_OF_CRC;
417
418 if ((rdma_ah_get_ah_flags(ah_attr) & IB_AH_GRH) &&
419 hfi1_check_mcast(rdma_ah_get_dlid(ah_attr))) {
420 struct ib_grh *grh;
421 struct ib_global_route *grd = rdma_ah_retrieve_grh(ah_attr);
422 /*
423 * Ensure OPA GIDs are transformed to IB gids
424 * before creating the GRH.
425 */
426 if (grd->sgid_index == OPA_GID_INDEX) {
427 dd_dev_warn(ppd->dd, "Bad sgid_index. sgid_index: %d\n",
428 grd->sgid_index);
429 grd->sgid_index = 0;
430 }
431 grh = &ps->s_txreq->phdr.hdr.opah.u.l.grh;
432 ps->s_txreq->hdr_dwords += hfi1_make_grh(
433 ibp, grh, grd,
434 ps->s_txreq->hdr_dwords - LRH_16B_DWORDS,
435 nwords);
436 ohdr = &ps->s_txreq->phdr.hdr.opah.u.l.oth;
437 l4 = OPA_16B_L4_IB_GLOBAL;
438 } else {
439 ohdr = &ps->s_txreq->phdr.hdr.opah.u.oth;
440 l4 = OPA_16B_L4_IB_LOCAL;
441 }
442
443 sc5 = ibp->sl_to_sc[rdma_ah_get_sl(ah_attr)];
444 if (qp->ibqp.qp_type == IB_QPT_SMI)
445 priv->s_sc = 0xf;
446 else
447 priv->s_sc = sc5;
448
449 dlid = opa_get_lid(rdma_ah_get_dlid(ah_attr), 16B);
450 if (!ppd->lid)
451 slid = be32_to_cpu(OPA_LID_PERMISSIVE);
452 else
453 slid = ppd->lid | (rdma_ah_get_path_bits(ah_attr) &
454 ((1 << ppd->lmc) - 1));
455
456 hfi1_make_bth_deth(qp, wqe, ohdr, &pkey, extra_bytes, true);
457 /* Convert dwords to flits */
458 len = (ps->s_txreq->hdr_dwords + nwords) >> 1;
459
460 /* Setup the packet */
461 ps->s_txreq->phdr.hdr.hdr_type = HFI1_PKT_TYPE_16B;
462 hfi1_make_16b_hdr(&ps->s_txreq->phdr.hdr.opah,
463 slid, dlid, len, pkey, 0, 0, l4, priv->s_sc);
464}
465
466/**
467 * hfi1_make_ud_req - construct a UD request packet
468 * @qp: the QP
469 *
470 * Assume s_lock is held.
471 *
472 * Return 1 if constructed; otherwise, return 0.
473 */
474int hfi1_make_ud_req(struct rvt_qp *qp, struct hfi1_pkt_state *ps)
475{
476 struct hfi1_qp_priv *priv = qp->priv;
477 struct rdma_ah_attr *ah_attr;
478 struct hfi1_pportdata *ppd;
479 struct hfi1_ibport *ibp;
480 struct rvt_swqe *wqe;
481 int next_cur;
482 u32 lid;
483
484 ps->s_txreq = get_txreq(ps->dev, qp);
485 if (IS_ERR(ps->s_txreq))
486 goto bail_no_tx;
487
488 if (!(ib_rvt_state_ops[qp->state] & RVT_PROCESS_NEXT_SEND_OK)) {
489 if (!(ib_rvt_state_ops[qp->state] & RVT_FLUSH_SEND))
490 goto bail;
491 /* We are in the error state, flush the work request. */
492 if (qp->s_last == READ_ONCE(qp->s_head))
493 goto bail;
494 /* If DMAs are in progress, we can't flush immediately. */
495 if (iowait_sdma_pending(&priv->s_iowait)) {
496 qp->s_flags |= RVT_S_WAIT_DMA;
497 goto bail;
498 }
499 wqe = rvt_get_swqe_ptr(qp, qp->s_last);
500 hfi1_send_complete(qp, wqe, IB_WC_WR_FLUSH_ERR);
501 goto done_free_tx;
502 }
503
504 /* see post_one_send() */
505 if (qp->s_cur == READ_ONCE(qp->s_head))
506 goto bail;
507
508 wqe = rvt_get_swqe_ptr(qp, qp->s_cur);
509 next_cur = qp->s_cur + 1;
510 if (next_cur >= qp->s_size)
511 next_cur = 0;
512
513 /* Construct the header. */
514 ibp = to_iport(qp->ibqp.device, qp->port_num);
515 ppd = ppd_from_ibp(ibp);
516 ah_attr = &ibah_to_rvtah(wqe->ud_wr.ah)->attr;
517 priv->hdr_type = hfi1_get_hdr_type(ppd->lid, ah_attr);
518 if ((!hfi1_check_mcast(rdma_ah_get_dlid(ah_attr))) ||
519 (rdma_ah_get_dlid(ah_attr) == be32_to_cpu(OPA_LID_PERMISSIVE))) {
520 lid = rdma_ah_get_dlid(ah_attr) & ~((1 << ppd->lmc) - 1);
521 if (unlikely(!loopback &&
522 ((lid == ppd->lid) ||
523 ((lid == be32_to_cpu(OPA_LID_PERMISSIVE)) &&
524 (qp->ibqp.qp_type == IB_QPT_GSI))))) {
525 unsigned long tflags = ps->flags;
526 /*
527 * If DMAs are in progress, we can't generate
528 * a completion for the loopback packet since
529 * it would be out of order.
530 * Instead of waiting, we could queue a
531 * zero length descriptor so we get a callback.
532 */
533 if (iowait_sdma_pending(&priv->s_iowait)) {
534 qp->s_flags |= RVT_S_WAIT_DMA;
535 goto bail;
536 }
537 qp->s_cur = next_cur;
538 spin_unlock_irqrestore(&qp->s_lock, tflags);
539 ud_loopback(qp, wqe);
540 spin_lock_irqsave(&qp->s_lock, tflags);
541 ps->flags = tflags;
542 hfi1_send_complete(qp, wqe, IB_WC_SUCCESS);
543 goto done_free_tx;
544 }
545 }
546
547 qp->s_cur = next_cur;
548 ps->s_txreq->s_cur_size = wqe->length;
549 ps->s_txreq->ss = &qp->s_sge;
550 qp->s_srate = rdma_ah_get_static_rate(ah_attr);
551 qp->srate_mbps = ib_rate_to_mbps(qp->s_srate);
552 qp->s_wqe = wqe;
553 qp->s_sge.sge = wqe->sg_list[0];
554 qp->s_sge.sg_list = wqe->sg_list + 1;
555 qp->s_sge.num_sge = wqe->wr.num_sge;
556 qp->s_sge.total_len = wqe->length;
557
558 /* Make the appropriate header */
559 hfi1_make_ud_req_tbl[priv->hdr_type](qp, ps, qp->s_wqe);
560 priv->s_sde = qp_to_sdma_engine(qp, priv->s_sc);
561 ps->s_txreq->sde = priv->s_sde;
562 priv->s_sendcontext = qp_to_send_context(qp, priv->s_sc);
563 ps->s_txreq->psc = priv->s_sendcontext;
564 /* disarm any ahg */
565 priv->s_ahg->ahgcount = 0;
566 priv->s_ahg->ahgidx = 0;
567 priv->s_ahg->tx_flags = 0;
568
569 return 1;
570
571done_free_tx:
572 hfi1_put_txreq(ps->s_txreq);
573 ps->s_txreq = NULL;
574 return 1;
575
576bail:
577 hfi1_put_txreq(ps->s_txreq);
578
579bail_no_tx:
580 ps->s_txreq = NULL;
581 qp->s_flags &= ~RVT_S_BUSY;
582 return 0;
583}
584
585/*
586 * Hardware can't check this so we do it here.
587 *
588 * This is a slightly different algorithm than the standard pkey check. It
589 * special cases the management keys and allows for 0x7fff and 0xffff to be in
590 * the table at the same time.
591 *
592 * @returns the index found or -1 if not found
593 */
594int hfi1_lookup_pkey_idx(struct hfi1_ibport *ibp, u16 pkey)
595{
596 struct hfi1_pportdata *ppd = ppd_from_ibp(ibp);
597 unsigned i;
598
599 if (pkey == FULL_MGMT_P_KEY || pkey == LIM_MGMT_P_KEY) {
600 unsigned lim_idx = -1;
601
602 for (i = 0; i < ARRAY_SIZE(ppd->pkeys); ++i) {
603 /* here we look for an exact match */
604 if (ppd->pkeys[i] == pkey)
605 return i;
606 if (ppd->pkeys[i] == LIM_MGMT_P_KEY)
607 lim_idx = i;
608 }
609
610 /* did not find 0xffff return 0x7fff idx if found */
611 if (pkey == FULL_MGMT_P_KEY)
612 return lim_idx;
613
614 /* no match... */
615 return -1;
616 }
617
618 pkey &= 0x7fff; /* remove limited/full membership bit */
619
620 for (i = 0; i < ARRAY_SIZE(ppd->pkeys); ++i)
621 if ((ppd->pkeys[i] & 0x7fff) == pkey)
622 return i;
623
624 /*
625 * Should not get here, this means hardware failed to validate pkeys.
626 */
627 return -1;
628}
629
630void return_cnp_16B(struct hfi1_ibport *ibp, struct rvt_qp *qp,
631 u32 remote_qpn, u16 pkey, u32 slid, u32 dlid,
632 u8 sc5, const struct ib_grh *old_grh)
633{
634 u64 pbc, pbc_flags = 0;
635 u32 bth0, plen, vl, hwords = 7;
636 u16 len;
637 u8 l4;
638 struct hfi1_16b_header hdr;
639 struct ib_other_headers *ohdr;
640 struct pio_buf *pbuf;
641 struct send_context *ctxt = qp_to_send_context(qp, sc5);
642 struct hfi1_pportdata *ppd = ppd_from_ibp(ibp);
643 u32 nwords;
644
645 /* Populate length */
646 nwords = ((hfi1_get_16b_padding(hwords << 2, 0) +
647 SIZE_OF_LT) >> 2) + SIZE_OF_CRC;
648 if (old_grh) {
649 struct ib_grh *grh = &hdr.u.l.grh;
650
651 grh->version_tclass_flow = old_grh->version_tclass_flow;
652 grh->paylen = cpu_to_be16(
653 (hwords - LRH_16B_DWORDS + nwords) << 2);
654 grh->hop_limit = 0xff;
655 grh->sgid = old_grh->dgid;
656 grh->dgid = old_grh->sgid;
657 ohdr = &hdr.u.l.oth;
658 l4 = OPA_16B_L4_IB_GLOBAL;
659 hwords += sizeof(struct ib_grh) / sizeof(u32);
660 } else {
661 ohdr = &hdr.u.oth;
662 l4 = OPA_16B_L4_IB_LOCAL;
663 }
664
665 /* BIT 16 to 19 is TVER. Bit 20 to 22 is pad cnt */
666 bth0 = (IB_OPCODE_CNP << 24) | (1 << 16) |
667 (hfi1_get_16b_padding(hwords << 2, 0) << 20);
668 ohdr->bth[0] = cpu_to_be32(bth0);
669
670 ohdr->bth[1] = cpu_to_be32(remote_qpn);
671 ohdr->bth[2] = 0; /* PSN 0 */
672
673 /* Convert dwords to flits */
674 len = (hwords + nwords) >> 1;
675 hfi1_make_16b_hdr(&hdr, slid, dlid, len, pkey, 1, 0, l4, sc5);
676
677 plen = 2 /* PBC */ + hwords + nwords;
678 pbc_flags |= PBC_PACKET_BYPASS | PBC_INSERT_BYPASS_ICRC;
679 vl = sc_to_vlt(ppd->dd, sc5);
680 pbc = create_pbc(ppd, pbc_flags, qp->srate_mbps, vl, plen);
681 if (ctxt) {
682 pbuf = sc_buffer_alloc(ctxt, plen, NULL, NULL);
683 if (pbuf)
684 ppd->dd->pio_inline_send(ppd->dd, pbuf, pbc,
685 &hdr, hwords);
686 }
687}
688
689void return_cnp(struct hfi1_ibport *ibp, struct rvt_qp *qp, u32 remote_qpn,
690 u16 pkey, u32 slid, u32 dlid, u8 sc5,
691 const struct ib_grh *old_grh)
692{
693 u64 pbc, pbc_flags = 0;
694 u32 bth0, plen, vl, hwords = 5;
695 u16 lrh0;
696 u8 sl = ibp->sc_to_sl[sc5];
697 struct ib_header hdr;
698 struct ib_other_headers *ohdr;
699 struct pio_buf *pbuf;
700 struct send_context *ctxt = qp_to_send_context(qp, sc5);
701 struct hfi1_pportdata *ppd = ppd_from_ibp(ibp);
702
703 if (old_grh) {
704 struct ib_grh *grh = &hdr.u.l.grh;
705
706 grh->version_tclass_flow = old_grh->version_tclass_flow;
707 grh->paylen = cpu_to_be16(
708 (hwords - LRH_9B_DWORDS + SIZE_OF_CRC) << 2);
709 grh->hop_limit = 0xff;
710 grh->sgid = old_grh->dgid;
711 grh->dgid = old_grh->sgid;
712 ohdr = &hdr.u.l.oth;
713 lrh0 = HFI1_LRH_GRH;
714 hwords += sizeof(struct ib_grh) / sizeof(u32);
715 } else {
716 ohdr = &hdr.u.oth;
717 lrh0 = HFI1_LRH_BTH;
718 }
719
720 lrh0 |= (sc5 & 0xf) << 12 | sl << 4;
721
722 bth0 = pkey | (IB_OPCODE_CNP << 24);
723 ohdr->bth[0] = cpu_to_be32(bth0);
724
725 ohdr->bth[1] = cpu_to_be32(remote_qpn | (1 << IB_BECN_SHIFT));
726 ohdr->bth[2] = 0; /* PSN 0 */
727
728 hfi1_make_ib_hdr(&hdr, lrh0, hwords + SIZE_OF_CRC, dlid, slid);
729 plen = 2 /* PBC */ + hwords;
730 pbc_flags |= (ib_is_sc5(sc5) << PBC_DC_INFO_SHIFT);
731 vl = sc_to_vlt(ppd->dd, sc5);
732 pbc = create_pbc(ppd, pbc_flags, qp->srate_mbps, vl, plen);
733 if (ctxt) {
734 pbuf = sc_buffer_alloc(ctxt, plen, NULL, NULL);
735 if (pbuf)
736 ppd->dd->pio_inline_send(ppd->dd, pbuf, pbc,
737 &hdr, hwords);
738 }
739}
740
741/*
742 * opa_smp_check() - Do the regular pkey checking, and the additional
743 * checks for SMPs specified in OPAv1 rev 1.0, 9/19/2016 update, section
744 * 9.10.25 ("SMA Packet Checks").
745 *
746 * Note that:
747 * - Checks are done using the pkey directly from the packet's BTH,
748 * and specifically _not_ the pkey that we attach to the completion,
749 * which may be different.
750 * - These checks are specifically for "non-local" SMPs (i.e., SMPs
751 * which originated on another node). SMPs which are sent from, and
752 * destined to this node are checked in opa_local_smp_check().
753 *
754 * At the point where opa_smp_check() is called, we know:
755 * - destination QP is QP0
756 *
757 * opa_smp_check() returns 0 if all checks succeed, 1 otherwise.
758 */
759static int opa_smp_check(struct hfi1_ibport *ibp, u16 pkey, u8 sc5,
760 struct rvt_qp *qp, u16 slid, struct opa_smp *smp)
761{
762 struct hfi1_pportdata *ppd = ppd_from_ibp(ibp);
763
764 /*
765 * I don't think it's possible for us to get here with sc != 0xf,
766 * but check it to be certain.
767 */
768 if (sc5 != 0xf)
769 return 1;
770
771 if (rcv_pkey_check(ppd, pkey, sc5, slid))
772 return 1;
773
774 /*
775 * At this point we know (and so don't need to check again) that
776 * the pkey is either LIM_MGMT_P_KEY, or FULL_MGMT_P_KEY
777 * (see ingress_pkey_check).
778 */
779 if (smp->mgmt_class != IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE &&
780 smp->mgmt_class != IB_MGMT_CLASS_SUBN_LID_ROUTED) {
781 ingress_pkey_table_fail(ppd, pkey, slid);
782 return 1;
783 }
784
785 /*
786 * SMPs fall into one of four (disjoint) categories:
787 * SMA request, SMA response, SMA trap, or SMA trap repress.
788 * Our response depends, in part, on which type of SMP we're
789 * processing.
790 *
791 * If this is an SMA response, skip the check here.
792 *
793 * If this is an SMA request or SMA trap repress:
794 * - pkey != FULL_MGMT_P_KEY =>
795 * increment port recv constraint errors, drop MAD
796 *
797 * Otherwise:
798 * - accept if the port is running an SM
799 * - drop MAD if it's an SMA trap
800 * - pkey == FULL_MGMT_P_KEY =>
801 * reply with unsupported method
802 * - pkey != FULL_MGMT_P_KEY =>
803 * increment port recv constraint errors, drop MAD
804 */
805 switch (smp->method) {
806 case IB_MGMT_METHOD_GET_RESP:
807 case IB_MGMT_METHOD_REPORT_RESP:
808 break;
809 case IB_MGMT_METHOD_GET:
810 case IB_MGMT_METHOD_SET:
811 case IB_MGMT_METHOD_REPORT:
812 case IB_MGMT_METHOD_TRAP_REPRESS:
813 if (pkey != FULL_MGMT_P_KEY) {
814 ingress_pkey_table_fail(ppd, pkey, slid);
815 return 1;
816 }
817 break;
818 default:
819 if (ibp->rvp.port_cap_flags & IB_PORT_SM)
820 return 0;
821 if (smp->method == IB_MGMT_METHOD_TRAP)
822 return 1;
823 if (pkey == FULL_MGMT_P_KEY) {
824 smp->status |= IB_SMP_UNSUP_METHOD;
825 return 0;
826 }
827 ingress_pkey_table_fail(ppd, pkey, slid);
828 return 1;
829 }
830 return 0;
831}
832
833/**
834 * hfi1_ud_rcv - receive an incoming UD packet
835 * @ibp: the port the packet came in on
836 * @hdr: the packet header
837 * @rcv_flags: flags relevant to rcv processing
838 * @data: the packet data
839 * @tlen: the packet length
840 * @qp: the QP the packet came on
841 *
842 * This is called from qp_rcv() to process an incoming UD packet
843 * for the given QP.
844 * Called at interrupt level.
845 */
846void hfi1_ud_rcv(struct hfi1_packet *packet)
847{
848 struct ib_other_headers *ohdr = packet->ohdr;
849 u32 hdrsize = packet->hlen;
850 struct ib_wc wc;
851 u32 qkey;
852 u32 src_qp;
853 u16 pkey;
854 int mgmt_pkey_idx = -1;
855 struct hfi1_ibport *ibp = rcd_to_iport(packet->rcd);
856 struct hfi1_pportdata *ppd = ppd_from_ibp(ibp);
857 void *data = packet->payload;
858 u32 tlen = packet->tlen;
859 struct rvt_qp *qp = packet->qp;
860 u8 sc5 = packet->sc;
861 u8 sl_from_sc;
862 u8 opcode = packet->opcode;
863 u8 sl = packet->sl;
864 u32 dlid = packet->dlid;
865 u32 slid = packet->slid;
866 u8 extra_bytes;
867 bool dlid_is_permissive;
868 bool slid_is_permissive;
869
870 extra_bytes = packet->pad + packet->extra_byte + (SIZE_OF_CRC << 2);
871 qkey = ib_get_qkey(ohdr);
872 src_qp = ib_get_sqpn(ohdr);
873
874 if (packet->etype == RHF_RCV_TYPE_BYPASS) {
875 u32 permissive_lid =
876 opa_get_lid(be32_to_cpu(OPA_LID_PERMISSIVE), 16B);
877
878 pkey = hfi1_16B_get_pkey(packet->hdr);
879 dlid_is_permissive = (dlid == permissive_lid);
880 slid_is_permissive = (slid == permissive_lid);
881 } else {
882 pkey = ib_bth_get_pkey(ohdr);
883 dlid_is_permissive = (dlid == be16_to_cpu(IB_LID_PERMISSIVE));
884 slid_is_permissive = (slid == be16_to_cpu(IB_LID_PERMISSIVE));
885 }
886 sl_from_sc = ibp->sc_to_sl[sc5];
887
888 process_ecn(qp, packet, (opcode != IB_OPCODE_CNP));
889 /*
890 * Get the number of bytes the message was padded by
891 * and drop incomplete packets.
892 */
893 if (unlikely(tlen < (hdrsize + extra_bytes)))
894 goto drop;
895
896 tlen -= hdrsize + extra_bytes;
897
898 /*
899 * Check that the permissive LID is only used on QP0
900 * and the QKEY matches (see 9.6.1.4.1 and 9.6.1.5.1).
901 */
902 if (qp->ibqp.qp_num) {
903 if (unlikely(dlid_is_permissive || slid_is_permissive))
904 goto drop;
905 if (qp->ibqp.qp_num > 1) {
906 if (unlikely(rcv_pkey_check(ppd, pkey, sc5, slid))) {
907 /*
908 * Traps will not be sent for packets dropped
909 * by the HW. This is fine, as sending trap
910 * for invalid pkeys is optional according to
911 * IB spec (release 1.3, section 10.9.4)
912 */
913 hfi1_bad_pkey(ibp,
914 pkey, sl,
915 src_qp, qp->ibqp.qp_num,
916 slid, dlid);
917 return;
918 }
919 } else {
920 /* GSI packet */
921 mgmt_pkey_idx = hfi1_lookup_pkey_idx(ibp, pkey);
922 if (mgmt_pkey_idx < 0)
923 goto drop;
924 }
925 if (unlikely(qkey != qp->qkey)) /* Silent drop */
926 return;
927
928 /* Drop invalid MAD packets (see 13.5.3.1). */
929 if (unlikely(qp->ibqp.qp_num == 1 &&
930 (tlen > 2048 || (sc5 == 0xF))))
931 goto drop;
932 } else {
933 /* Received on QP0, and so by definition, this is an SMP */
934 struct opa_smp *smp = (struct opa_smp *)data;
935
936 if (opa_smp_check(ibp, pkey, sc5, qp, slid, smp))
937 goto drop;
938
939 if (tlen > 2048)
940 goto drop;
941 if ((dlid_is_permissive || slid_is_permissive) &&
942 smp->mgmt_class != IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
943 goto drop;
944
945 /* look up SMI pkey */
946 mgmt_pkey_idx = hfi1_lookup_pkey_idx(ibp, pkey);
947 if (mgmt_pkey_idx < 0)
948 goto drop;
949 }
950
951 if (qp->ibqp.qp_num > 1 &&
952 opcode == IB_OPCODE_UD_SEND_ONLY_WITH_IMMEDIATE) {
953 wc.ex.imm_data = ohdr->u.ud.imm_data;
954 wc.wc_flags = IB_WC_WITH_IMM;
955 tlen -= sizeof(u32);
956 } else if (opcode == IB_OPCODE_UD_SEND_ONLY) {
957 wc.ex.imm_data = 0;
958 wc.wc_flags = 0;
959 } else {
960 goto drop;
961 }
962
963 /*
964 * A GRH is expected to precede the data even if not
965 * present on the wire.
966 */
967 wc.byte_len = tlen + sizeof(struct ib_grh);
968
969 /*
970 * Get the next work request entry to find where to put the data.
971 */
972 if (qp->r_flags & RVT_R_REUSE_SGE) {
973 qp->r_flags &= ~RVT_R_REUSE_SGE;
974 } else {
975 int ret;
976
977 ret = hfi1_rvt_get_rwqe(qp, 0);
978 if (ret < 0) {
979 rvt_rc_error(qp, IB_WC_LOC_QP_OP_ERR);
980 return;
981 }
982 if (!ret) {
983 if (qp->ibqp.qp_num == 0)
984 ibp->rvp.n_vl15_dropped++;
985 return;
986 }
987 }
988 /* Silently drop packets which are too big. */
989 if (unlikely(wc.byte_len > qp->r_len)) {
990 qp->r_flags |= RVT_R_REUSE_SGE;
991 goto drop;
992 }
993 if (packet->grh) {
994 hfi1_copy_sge(&qp->r_sge, packet->grh,
995 sizeof(struct ib_grh), true, false);
996 wc.wc_flags |= IB_WC_GRH;
997 } else if (packet->etype == RHF_RCV_TYPE_BYPASS) {
998 struct ib_grh grh;
999 /*
1000 * Assuming we only created 16B on the send side
1001 * if we want to use large LIDs, since GRH was stripped
1002 * out when creating 16B, add back the GRH here.
1003 */
1004 hfi1_make_ext_grh(packet, &grh, slid, dlid);
1005 hfi1_copy_sge(&qp->r_sge, &grh,
1006 sizeof(struct ib_grh), true, false);
1007 wc.wc_flags |= IB_WC_GRH;
1008 } else {
1009 rvt_skip_sge(&qp->r_sge, sizeof(struct ib_grh), true);
1010 }
1011 hfi1_copy_sge(&qp->r_sge, data, wc.byte_len - sizeof(struct ib_grh),
1012 true, false);
1013 rvt_put_ss(&qp->r_sge);
1014 if (!test_and_clear_bit(RVT_R_WRID_VALID, &qp->r_aflags))
1015 return;
1016 wc.wr_id = qp->r_wr_id;
1017 wc.status = IB_WC_SUCCESS;
1018 wc.opcode = IB_WC_RECV;
1019 wc.vendor_err = 0;
1020 wc.qp = &qp->ibqp;
1021 wc.src_qp = src_qp;
1022
1023 if (qp->ibqp.qp_type == IB_QPT_GSI ||
1024 qp->ibqp.qp_type == IB_QPT_SMI) {
1025 if (mgmt_pkey_idx < 0) {
1026 if (net_ratelimit()) {
1027 struct hfi1_devdata *dd = ppd->dd;
1028
1029 dd_dev_err(dd, "QP type %d mgmt_pkey_idx < 0 and packet not dropped???\n",
1030 qp->ibqp.qp_type);
1031 mgmt_pkey_idx = 0;
1032 }
1033 }
1034 wc.pkey_index = (unsigned)mgmt_pkey_idx;
1035 } else {
1036 wc.pkey_index = 0;
1037 }
1038 if (slid_is_permissive)
1039 slid = be32_to_cpu(OPA_LID_PERMISSIVE);
1040 wc.slid = slid & U16_MAX;
1041 wc.sl = sl_from_sc;
1042
1043 /*
1044 * Save the LMC lower bits if the destination LID is a unicast LID.
1045 */
1046 wc.dlid_path_bits = hfi1_check_mcast(dlid) ? 0 :
1047 dlid & ((1 << ppd_from_ibp(ibp)->lmc) - 1);
1048 wc.port_num = qp->port_num;
1049 /* Signal completion event if the solicited bit is set. */
1050 rvt_cq_enter(ibcq_to_rvtcq(qp->ibqp.recv_cq), &wc,
1051 ib_bth_is_solicited(ohdr));
1052 return;
1053
1054drop:
1055 ibp->rvp.n_pkt_drops++;
1056}