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[linux.git] / drivers / infiniband / hw / hfi1 / ud.c
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  */
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
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
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
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  */
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  */
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
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
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  */
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  */
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 }
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