1f931551bSRalph Campbell /*
2f931551bSRalph Campbell * Copyright (c) 2006, 2007, 2008, 2009 QLogic Corporation. All rights reserved.
3f931551bSRalph Campbell * Copyright (c) 2005, 2006 PathScale, Inc. All rights reserved.
4f931551bSRalph Campbell *
5f931551bSRalph Campbell * This software is available to you under a choice of one of two
6f931551bSRalph Campbell * licenses. You may choose to be licensed under the terms of the GNU
7f931551bSRalph Campbell * General Public License (GPL) Version 2, available from the file
8f931551bSRalph Campbell * COPYING in the main directory of this source tree, or the
9f931551bSRalph Campbell * OpenIB.org BSD license below:
10f931551bSRalph Campbell *
11f931551bSRalph Campbell * Redistribution and use in source and binary forms, with or
12f931551bSRalph Campbell * without modification, are permitted provided that the following
13f931551bSRalph Campbell * conditions are met:
14f931551bSRalph Campbell *
15f931551bSRalph Campbell * - Redistributions of source code must retain the above
16f931551bSRalph Campbell * copyright notice, this list of conditions and the following
17f931551bSRalph Campbell * disclaimer.
18f931551bSRalph Campbell *
19f931551bSRalph Campbell * - Redistributions in binary form must reproduce the above
20f931551bSRalph Campbell * copyright notice, this list of conditions and the following
21f931551bSRalph Campbell * disclaimer in the documentation and/or other materials
22f931551bSRalph Campbell * provided with the distribution.
23f931551bSRalph Campbell *
24f931551bSRalph Campbell * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
25f931551bSRalph Campbell * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
26f931551bSRalph Campbell * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
27f931551bSRalph Campbell * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
28f931551bSRalph Campbell * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
29f931551bSRalph Campbell * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
30f931551bSRalph Campbell * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
31f931551bSRalph Campbell * SOFTWARE.
32f931551bSRalph Campbell */
33f931551bSRalph Campbell
34f931551bSRalph Campbell #include <linux/spinlock.h>
350629cb06SIra Weiny #include <rdma/ib_smi.h>
36f931551bSRalph Campbell
37f931551bSRalph Campbell #include "qib.h"
38f931551bSRalph Campbell #include "qib_mad.h"
39f931551bSRalph Campbell
40f931551bSRalph Campbell /*
41f931551bSRalph Campbell * Switch to alternate path.
42f931551bSRalph Campbell * The QP s_lock should be held and interrupts disabled.
43f931551bSRalph Campbell */
qib_migrate_qp(struct rvt_qp * qp)447c2e11feSDennis Dalessandro void qib_migrate_qp(struct rvt_qp *qp)
45f931551bSRalph Campbell {
46f931551bSRalph Campbell struct ib_event ev;
47f931551bSRalph Campbell
48f931551bSRalph Campbell qp->s_mig_state = IB_MIG_MIGRATED;
49f931551bSRalph Campbell qp->remote_ah_attr = qp->alt_ah_attr;
50d8966fcdSDasaratharaman Chandramouli qp->port_num = rdma_ah_get_port_num(&qp->alt_ah_attr);
51f931551bSRalph Campbell qp->s_pkey_index = qp->s_alt_pkey_index;
52f931551bSRalph Campbell
53f931551bSRalph Campbell ev.device = qp->ibqp.device;
54f931551bSRalph Campbell ev.element.qp = &qp->ibqp;
55f931551bSRalph Campbell ev.event = IB_EVENT_PATH_MIG;
56f931551bSRalph Campbell qp->ibqp.event_handler(&ev, qp->ibqp.qp_context);
57f931551bSRalph Campbell }
58f931551bSRalph Campbell
get_sguid(struct qib_ibport * ibp,unsigned index)59f931551bSRalph Campbell static __be64 get_sguid(struct qib_ibport *ibp, unsigned index)
60f931551bSRalph Campbell {
61f931551bSRalph Campbell if (!index) {
62f931551bSRalph Campbell struct qib_pportdata *ppd = ppd_from_ibp(ibp);
63f931551bSRalph Campbell
64f931551bSRalph Campbell return ppd->guid;
65a46a2802SMike Marciniszyn }
66f931551bSRalph Campbell return ibp->guids[index - 1];
67f931551bSRalph Campbell }
68f931551bSRalph Campbell
gid_ok(union ib_gid * gid,__be64 gid_prefix,__be64 id)69f931551bSRalph Campbell static int gid_ok(union ib_gid *gid, __be64 gid_prefix, __be64 id)
70f931551bSRalph Campbell {
71f931551bSRalph Campbell return (gid->global.interface_id == id &&
72f931551bSRalph Campbell (gid->global.subnet_prefix == gid_prefix ||
73f931551bSRalph Campbell gid->global.subnet_prefix == IB_DEFAULT_GID_PREFIX));
74f931551bSRalph Campbell }
75f931551bSRalph Campbell
76f931551bSRalph Campbell /*
77f931551bSRalph Campbell *
789fd5473dSMike Marciniszyn * This should be called with the QP r_lock held.
799fd5473dSMike Marciniszyn *
809fd5473dSMike Marciniszyn * The s_lock will be acquired around the qib_migrate_qp() call.
81f931551bSRalph Campbell */
qib_ruc_check_hdr(struct qib_ibport * ibp,struct ib_header * hdr,int has_grh,struct rvt_qp * qp,u32 bth0)82261a4351SMike Marciniszyn int qib_ruc_check_hdr(struct qib_ibport *ibp, struct ib_header *hdr,
837c2e11feSDennis Dalessandro int has_grh, struct rvt_qp *qp, u32 bth0)
84f931551bSRalph Campbell {
85f931551bSRalph Campbell __be64 guid;
869fd5473dSMike Marciniszyn unsigned long flags;
87f931551bSRalph Campbell
88f931551bSRalph Campbell if (qp->s_mig_state == IB_MIG_ARMED && (bth0 & IB_BTH_MIG_REQ)) {
89f931551bSRalph Campbell if (!has_grh) {
90d8966fcdSDasaratharaman Chandramouli if (rdma_ah_get_ah_flags(&qp->alt_ah_attr) &
91d8966fcdSDasaratharaman Chandramouli IB_AH_GRH)
92f931551bSRalph Campbell goto err;
93f931551bSRalph Campbell } else {
94d8966fcdSDasaratharaman Chandramouli const struct ib_global_route *grh;
95d8966fcdSDasaratharaman Chandramouli
96d8966fcdSDasaratharaman Chandramouli if (!(rdma_ah_get_ah_flags(&qp->alt_ah_attr) &
97d8966fcdSDasaratharaman Chandramouli IB_AH_GRH))
98f931551bSRalph Campbell goto err;
99d8966fcdSDasaratharaman Chandramouli grh = rdma_ah_read_grh(&qp->alt_ah_attr);
100d8966fcdSDasaratharaman Chandramouli guid = get_sguid(ibp, grh->sgid_index);
101f24a6d48SHarish Chegondi if (!gid_ok(&hdr->u.l.grh.dgid,
102f24a6d48SHarish Chegondi ibp->rvp.gid_prefix, guid))
103f931551bSRalph Campbell goto err;
104f931551bSRalph Campbell if (!gid_ok(&hdr->u.l.grh.sgid,
105d8966fcdSDasaratharaman Chandramouli grh->dgid.global.subnet_prefix,
106d8966fcdSDasaratharaman Chandramouli grh->dgid.global.interface_id))
107f931551bSRalph Campbell goto err;
108f931551bSRalph Campbell }
109f931551bSRalph Campbell if (!qib_pkey_ok((u16)bth0,
110f931551bSRalph Campbell qib_get_pkey(ibp, qp->s_alt_pkey_index))) {
11113d84914SDennis Dalessandro qib_bad_pkey(ibp,
112f931551bSRalph Campbell (u16)bth0,
113f931551bSRalph Campbell (be16_to_cpu(hdr->lrh[0]) >> 4) & 0xF,
114f931551bSRalph Campbell 0, qp->ibqp.qp_num,
115f931551bSRalph Campbell hdr->lrh[3], hdr->lrh[1]);
116f931551bSRalph Campbell goto err;
117f931551bSRalph Campbell }
118f931551bSRalph Campbell /* Validate the SLID. See Ch. 9.6.1.5 and 17.2.8 */
119d8966fcdSDasaratharaman Chandramouli if ((be16_to_cpu(hdr->lrh[3]) !=
120d8966fcdSDasaratharaman Chandramouli rdma_ah_get_dlid(&qp->alt_ah_attr)) ||
121d8966fcdSDasaratharaman Chandramouli ppd_from_ibp(ibp)->port !=
122d8966fcdSDasaratharaman Chandramouli rdma_ah_get_port_num(&qp->alt_ah_attr))
123f931551bSRalph Campbell goto err;
1249fd5473dSMike Marciniszyn spin_lock_irqsave(&qp->s_lock, flags);
125f931551bSRalph Campbell qib_migrate_qp(qp);
1269fd5473dSMike Marciniszyn spin_unlock_irqrestore(&qp->s_lock, flags);
127f931551bSRalph Campbell } else {
128f931551bSRalph Campbell if (!has_grh) {
129d8966fcdSDasaratharaman Chandramouli if (rdma_ah_get_ah_flags(&qp->remote_ah_attr) &
130d8966fcdSDasaratharaman Chandramouli IB_AH_GRH)
131f931551bSRalph Campbell goto err;
132f931551bSRalph Campbell } else {
133d8966fcdSDasaratharaman Chandramouli const struct ib_global_route *grh;
134d8966fcdSDasaratharaman Chandramouli
135d8966fcdSDasaratharaman Chandramouli if (!(rdma_ah_get_ah_flags(&qp->remote_ah_attr) &
136d8966fcdSDasaratharaman Chandramouli IB_AH_GRH))
137f931551bSRalph Campbell goto err;
138d8966fcdSDasaratharaman Chandramouli grh = rdma_ah_read_grh(&qp->remote_ah_attr);
139d8966fcdSDasaratharaman Chandramouli guid = get_sguid(ibp, grh->sgid_index);
140f24a6d48SHarish Chegondi if (!gid_ok(&hdr->u.l.grh.dgid,
141f24a6d48SHarish Chegondi ibp->rvp.gid_prefix, guid))
142f931551bSRalph Campbell goto err;
143f931551bSRalph Campbell if (!gid_ok(&hdr->u.l.grh.sgid,
144d8966fcdSDasaratharaman Chandramouli grh->dgid.global.subnet_prefix,
145d8966fcdSDasaratharaman Chandramouli grh->dgid.global.interface_id))
146f931551bSRalph Campbell goto err;
147f931551bSRalph Campbell }
148f931551bSRalph Campbell if (!qib_pkey_ok((u16)bth0,
149f931551bSRalph Campbell qib_get_pkey(ibp, qp->s_pkey_index))) {
15013d84914SDennis Dalessandro qib_bad_pkey(ibp,
151f931551bSRalph Campbell (u16)bth0,
152f931551bSRalph Campbell (be16_to_cpu(hdr->lrh[0]) >> 4) & 0xF,
153f931551bSRalph Campbell 0, qp->ibqp.qp_num,
154f931551bSRalph Campbell hdr->lrh[3], hdr->lrh[1]);
155f931551bSRalph Campbell goto err;
156f931551bSRalph Campbell }
157f931551bSRalph Campbell /* Validate the SLID. See Ch. 9.6.1.5 */
158d8966fcdSDasaratharaman Chandramouli if (be16_to_cpu(hdr->lrh[3]) !=
159d8966fcdSDasaratharaman Chandramouli rdma_ah_get_dlid(&qp->remote_ah_attr) ||
160f931551bSRalph Campbell ppd_from_ibp(ibp)->port != qp->port_num)
161f931551bSRalph Campbell goto err;
162f931551bSRalph Campbell if (qp->s_mig_state == IB_MIG_REARM &&
163f931551bSRalph Campbell !(bth0 & IB_BTH_MIG_REQ))
164f931551bSRalph Campbell qp->s_mig_state = IB_MIG_ARMED;
165f931551bSRalph Campbell }
166f931551bSRalph Campbell
167f931551bSRalph Campbell return 0;
168f931551bSRalph Campbell
169f931551bSRalph Campbell err:
170f931551bSRalph Campbell return 1;
171f931551bSRalph Campbell }
172f931551bSRalph Campbell
173f931551bSRalph Campbell /**
174f931551bSRalph Campbell * qib_make_grh - construct a GRH header
175f931551bSRalph Campbell * @ibp: a pointer to the IB port
176f931551bSRalph Campbell * @hdr: a pointer to the GRH header being constructed
177f931551bSRalph Campbell * @grh: the global route address to send to
178f931551bSRalph Campbell * @hwords: the number of 32 bit words of header being sent
179f931551bSRalph Campbell * @nwords: the number of 32 bit words of data being sent
180f931551bSRalph Campbell *
181f931551bSRalph Campbell * Return the size of the header in 32 bit words.
182f931551bSRalph Campbell */
qib_make_grh(struct qib_ibport * ibp,struct ib_grh * hdr,const struct ib_global_route * grh,u32 hwords,u32 nwords)183f931551bSRalph Campbell u32 qib_make_grh(struct qib_ibport *ibp, struct ib_grh *hdr,
184d8966fcdSDasaratharaman Chandramouli const struct ib_global_route *grh, u32 hwords, u32 nwords)
185f931551bSRalph Campbell {
186f931551bSRalph Campbell hdr->version_tclass_flow =
187f931551bSRalph Campbell cpu_to_be32((IB_GRH_VERSION << IB_GRH_VERSION_SHIFT) |
188f931551bSRalph Campbell (grh->traffic_class << IB_GRH_TCLASS_SHIFT) |
189f931551bSRalph Campbell (grh->flow_label << IB_GRH_FLOW_SHIFT));
190f931551bSRalph Campbell hdr->paylen = cpu_to_be16((hwords - 2 + nwords + SIZE_OF_CRC) << 2);
191f931551bSRalph Campbell /* next_hdr is defined by C8-7 in ch. 8.4.1 */
192f931551bSRalph Campbell hdr->next_hdr = IB_GRH_NEXT_HDR;
193f931551bSRalph Campbell hdr->hop_limit = grh->hop_limit;
194f931551bSRalph Campbell /* The SGID is 32-bit aligned. */
195f24a6d48SHarish Chegondi hdr->sgid.global.subnet_prefix = ibp->rvp.gid_prefix;
19627147273SKamenee Arumugam if (!grh->sgid_index)
19727147273SKamenee Arumugam hdr->sgid.global.interface_id = ppd_from_ibp(ibp)->guid;
19827147273SKamenee Arumugam else if (grh->sgid_index < QIB_GUIDS_PER_PORT)
19927147273SKamenee Arumugam hdr->sgid.global.interface_id = ibp->guids[grh->sgid_index - 1];
200f931551bSRalph Campbell hdr->dgid = grh->dgid;
201f931551bSRalph Campbell
202f931551bSRalph Campbell /* GRH header size in 32-bit words. */
203f931551bSRalph Campbell return sizeof(struct ib_grh) / sizeof(u32);
204f931551bSRalph Campbell }
205f931551bSRalph Campbell
qib_make_ruc_header(struct rvt_qp * qp,struct ib_other_headers * ohdr,u32 bth0,u32 bth2)206261a4351SMike Marciniszyn void qib_make_ruc_header(struct rvt_qp *qp, struct ib_other_headers *ohdr,
207f931551bSRalph Campbell u32 bth0, u32 bth2)
208f931551bSRalph Campbell {
209ffc26907SDennis Dalessandro struct qib_qp_priv *priv = qp->priv;
210f931551bSRalph Campbell struct qib_ibport *ibp = to_iport(qp->ibqp.device, qp->port_num);
211f931551bSRalph Campbell u16 lrh0;
212f931551bSRalph Campbell u32 nwords;
213f931551bSRalph Campbell u32 extra_bytes;
214f931551bSRalph Campbell
215f931551bSRalph Campbell /* Construct the header. */
216f931551bSRalph Campbell extra_bytes = -qp->s_cur_size & 3;
217f931551bSRalph Campbell nwords = (qp->s_cur_size + extra_bytes) >> 2;
218f931551bSRalph Campbell lrh0 = QIB_LRH_BTH;
219d8966fcdSDasaratharaman Chandramouli if (unlikely(rdma_ah_get_ah_flags(&qp->remote_ah_attr) & IB_AH_GRH)) {
220d8966fcdSDasaratharaman Chandramouli qp->s_hdrwords +=
221d8966fcdSDasaratharaman Chandramouli qib_make_grh(ibp, &priv->s_hdr->u.l.grh,
222d8966fcdSDasaratharaman Chandramouli rdma_ah_read_grh(&qp->remote_ah_attr),
223f931551bSRalph Campbell qp->s_hdrwords, nwords);
224f931551bSRalph Campbell lrh0 = QIB_LRH_GRH;
225f931551bSRalph Campbell }
226d8966fcdSDasaratharaman Chandramouli lrh0 |= ibp->sl_to_vl[rdma_ah_get_sl(&qp->remote_ah_attr)] << 12 |
227d8966fcdSDasaratharaman Chandramouli rdma_ah_get_sl(&qp->remote_ah_attr) << 4;
228ffc26907SDennis Dalessandro priv->s_hdr->lrh[0] = cpu_to_be16(lrh0);
229d8966fcdSDasaratharaman Chandramouli priv->s_hdr->lrh[1] =
230d8966fcdSDasaratharaman Chandramouli cpu_to_be16(rdma_ah_get_dlid(&qp->remote_ah_attr));
231ffc26907SDennis Dalessandro priv->s_hdr->lrh[2] =
232ffc26907SDennis Dalessandro cpu_to_be16(qp->s_hdrwords + nwords + SIZE_OF_CRC);
233d8966fcdSDasaratharaman Chandramouli priv->s_hdr->lrh[3] =
234d8966fcdSDasaratharaman Chandramouli cpu_to_be16(ppd_from_ibp(ibp)->lid |
235d8966fcdSDasaratharaman Chandramouli rdma_ah_get_path_bits(&qp->remote_ah_attr));
236f931551bSRalph Campbell bth0 |= qib_get_pkey(ibp, qp->s_pkey_index);
237f931551bSRalph Campbell bth0 |= extra_bytes << 20;
238f931551bSRalph Campbell if (qp->s_mig_state == IB_MIG_MIGRATED)
239f931551bSRalph Campbell bth0 |= IB_BTH_MIG_REQ;
240f931551bSRalph Campbell ohdr->bth[0] = cpu_to_be32(bth0);
241f931551bSRalph Campbell ohdr->bth[1] = cpu_to_be32(qp->remote_qpn);
242f931551bSRalph Campbell ohdr->bth[2] = cpu_to_be32(bth2);
2437d7632adSMike Marciniszyn this_cpu_inc(ibp->pmastats->n_unicast_xmit);
244f931551bSRalph Campbell }
245f931551bSRalph Campbell
_qib_do_send(struct work_struct * work)246db3ef0ebSHarish Chegondi void _qib_do_send(struct work_struct *work)
247db3ef0ebSHarish Chegondi {
248db3ef0ebSHarish Chegondi struct qib_qp_priv *priv = container_of(work, struct qib_qp_priv,
249db3ef0ebSHarish Chegondi s_work);
250db3ef0ebSHarish Chegondi struct rvt_qp *qp = priv->owner;
251db3ef0ebSHarish Chegondi
252db3ef0ebSHarish Chegondi qib_do_send(qp);
253db3ef0ebSHarish Chegondi }
254db3ef0ebSHarish Chegondi
255f931551bSRalph Campbell /**
256f931551bSRalph Campbell * qib_do_send - perform a send on a QP
257db3ef0ebSHarish Chegondi * @qp: pointer to the QP
258f931551bSRalph Campbell *
259f931551bSRalph Campbell * Process entries in the send work queue until credit or queue is
260f931551bSRalph Campbell * exhausted. Only allow one CPU to send a packet per QP (tasklet).
261f931551bSRalph Campbell * Otherwise, two threads could send packets out of order.
262f931551bSRalph Campbell */
qib_do_send(struct rvt_qp * qp)263db3ef0ebSHarish Chegondi void qib_do_send(struct rvt_qp *qp)
264f931551bSRalph Campbell {
265db3ef0ebSHarish Chegondi struct qib_qp_priv *priv = qp->priv;
266f931551bSRalph Campbell struct qib_ibport *ibp = to_iport(qp->ibqp.device, qp->port_num);
267f931551bSRalph Campbell struct qib_pportdata *ppd = ppd_from_ibp(ibp);
268747f4d7aSMike Marciniszyn int (*make_req)(struct rvt_qp *qp, unsigned long *flags);
269f931551bSRalph Campbell unsigned long flags;
270f931551bSRalph Campbell
271f931551bSRalph Campbell if ((qp->ibqp.qp_type == IB_QPT_RC ||
272f931551bSRalph Campbell qp->ibqp.qp_type == IB_QPT_UC) &&
273d8966fcdSDasaratharaman Chandramouli (rdma_ah_get_dlid(&qp->remote_ah_attr) &
274d8966fcdSDasaratharaman Chandramouli ~((1 << ppd->lmc) - 1)) == ppd->lid) {
275*15703461SVenkata Sandeep Dhanalakota rvt_ruc_loopback(qp);
276f931551bSRalph Campbell return;
277f931551bSRalph Campbell }
278f931551bSRalph Campbell
279f931551bSRalph Campbell if (qp->ibqp.qp_type == IB_QPT_RC)
280f931551bSRalph Campbell make_req = qib_make_rc_req;
281f931551bSRalph Campbell else if (qp->ibqp.qp_type == IB_QPT_UC)
282f931551bSRalph Campbell make_req = qib_make_uc_req;
283f931551bSRalph Campbell else
284f931551bSRalph Campbell make_req = qib_make_ud_req;
285f931551bSRalph Campbell
286f931551bSRalph Campbell spin_lock_irqsave(&qp->s_lock, flags);
287f931551bSRalph Campbell
288f931551bSRalph Campbell /* Return if we are already busy processing a work request. */
289f931551bSRalph Campbell if (!qib_send_ok(qp)) {
290f931551bSRalph Campbell spin_unlock_irqrestore(&qp->s_lock, flags);
291f931551bSRalph Campbell return;
292f931551bSRalph Campbell }
293f931551bSRalph Campbell
29401ba79d4SHarish Chegondi qp->s_flags |= RVT_S_BUSY;
295f931551bSRalph Campbell
296f931551bSRalph Campbell do {
297f931551bSRalph Campbell /* Check for a constructed packet to be sent. */
298f931551bSRalph Campbell if (qp->s_hdrwords != 0) {
29946a80d62SMike Marciniszyn spin_unlock_irqrestore(&qp->s_lock, flags);
300f931551bSRalph Campbell /*
301f931551bSRalph Campbell * If the packet cannot be sent now, return and
302f931551bSRalph Campbell * the send tasklet will be woken up later.
303f931551bSRalph Campbell */
304ffc26907SDennis Dalessandro if (qib_verbs_send(qp, priv->s_hdr, qp->s_hdrwords,
305f931551bSRalph Campbell qp->s_cur_sge, qp->s_cur_size))
30646a80d62SMike Marciniszyn return;
307f931551bSRalph Campbell /* Record that s_hdr is empty. */
308f931551bSRalph Campbell qp->s_hdrwords = 0;
30946a80d62SMike Marciniszyn spin_lock_irqsave(&qp->s_lock, flags);
310f931551bSRalph Campbell }
311747f4d7aSMike Marciniszyn } while (make_req(qp, &flags));
31246a80d62SMike Marciniszyn
31346a80d62SMike Marciniszyn spin_unlock_irqrestore(&qp->s_lock, flags);
314f931551bSRalph Campbell }
315