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 */
16 static 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 */
ud_loopback(struct rvt_qp * sqp,struct rvt_swqe * swqe)31 static 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++;
218 bail_unlock:
219 spin_unlock_irqrestore(&qp->r_lock, flags);
220 drop:
221 rcu_read_unlock();
222 }
223
hfi1_make_bth_deth(struct rvt_qp * qp,struct rvt_swqe * wqe,struct ib_other_headers * ohdr,u16 * pkey,u32 extra_bytes,bool bypass)224 static 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
hfi1_make_ud_req_9B(struct rvt_qp * qp,struct hfi1_pkt_state * ps,struct rvt_swqe * wqe)261 void 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
hfi1_make_ud_req_16B(struct rvt_qp * qp,struct hfi1_pkt_state * ps,struct rvt_swqe * wqe)332 void 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 */
hfi1_make_ud_req(struct rvt_qp * qp,struct hfi1_pkt_state * ps)435 int 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
532 done_free_tx:
533 hfi1_put_txreq(ps->s_txreq);
534 ps->s_txreq = NULL;
535 return 1;
536
537 bail:
538 hfi1_put_txreq(ps->s_txreq);
539
540 bail_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 */
hfi1_lookup_pkey_idx(struct hfi1_ibport * ibp,u16 pkey)555 int 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
return_cnp_16B(struct hfi1_ibport * ibp,struct rvt_qp * qp,u32 remote_qpn,u16 pkey,u32 slid,u32 dlid,u8 sc5,const struct ib_grh * old_grh)591 void 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
return_cnp(struct hfi1_ibport * ibp,struct rvt_qp * qp,u32 remote_qpn,u16 pkey,u32 slid,u32 dlid,u8 sc5,const struct ib_grh * old_grh)653 void 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 */
opa_smp_check(struct hfi1_ibport * ibp,u16 pkey,u8 sc5,struct rvt_qp * qp,u16 slid,struct opa_smp * smp)726 static 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 */
hfi1_ud_rcv(struct hfi1_packet * packet)808 void 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
1021 drop:
1022 ibp->rvp.n_pkt_drops++;
1023 }
1024