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1/*
2 * Copyright (c) 2006, 2007, 2008, 2009 QLogic Corporation. All rights reserved.
3 * Copyright (c) 2005, 2006 PathScale, Inc. All rights reserved.
4 *
5 * This software is available to you under a choice of one of two
6 * licenses. You may choose to be licensed under the terms of the GNU
7 * General Public License (GPL) Version 2, available from the file
8 * COPYING in the main directory of this source tree, or the
9 * OpenIB.org BSD license below:
10 *
11 * Redistribution and use in source and binary forms, with or
12 * without modification, are permitted provided that the following
13 * conditions are met:
14 *
15 * - Redistributions of source code must retain the above
16 * copyright notice, this list of conditions and the following
17 * disclaimer.
18 *
19 * - Redistributions in binary form must reproduce the above
20 * copyright notice, this list of conditions and the following
21 * disclaimer in the documentation and/or other materials
22 * provided with the distribution.
23 *
24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
25 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
26 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
27 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
28 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
29 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
30 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
31 * SOFTWARE.
32 */
33
34#include <linux/spinlock.h>
35#include <rdma/ib_smi.h>
36
37#include "qib.h"
38#include "qib_mad.h"
39
40/*
41 * Switch to alternate path.
42 * The QP s_lock should be held and interrupts disabled.
43 */
44void qib_migrate_qp(struct rvt_qp *qp)
45{
46 struct ib_event ev;
47
48 qp->s_mig_state = IB_MIG_MIGRATED;
49 qp->remote_ah_attr = qp->alt_ah_attr;
50 qp->port_num = rdma_ah_get_port_num(&qp->alt_ah_attr);
51 qp->s_pkey_index = qp->s_alt_pkey_index;
52
53 ev.device = qp->ibqp.device;
54 ev.element.qp = &qp->ibqp;
55 ev.event = IB_EVENT_PATH_MIG;
56 qp->ibqp.event_handler(&ev, qp->ibqp.qp_context);
57}
58
59static __be64 get_sguid(struct qib_ibport *ibp, unsigned index)
60{
61 if (!index) {
62 struct qib_pportdata *ppd = ppd_from_ibp(ibp);
63
64 return ppd->guid;
65 }
66 return ibp->guids[index - 1];
67}
68
69static int gid_ok(union ib_gid *gid, __be64 gid_prefix, __be64 id)
70{
71 return (gid->global.interface_id == id &&
72 (gid->global.subnet_prefix == gid_prefix ||
73 gid->global.subnet_prefix == IB_DEFAULT_GID_PREFIX));
74}
75
76/*
77 *
78 * This should be called with the QP r_lock held.
79 *
80 * The s_lock will be acquired around the qib_migrate_qp() call.
81 */
82int qib_ruc_check_hdr(struct qib_ibport *ibp, struct ib_header *hdr,
83 int has_grh, struct rvt_qp *qp, u32 bth0)
84{
85 __be64 guid;
86 unsigned long flags;
87
88 if (qp->s_mig_state == IB_MIG_ARMED && (bth0 & IB_BTH_MIG_REQ)) {
89 if (!has_grh) {
90 if (rdma_ah_get_ah_flags(&qp->alt_ah_attr) &
91 IB_AH_GRH)
92 goto err;
93 } else {
94 const struct ib_global_route *grh;
95
96 if (!(rdma_ah_get_ah_flags(&qp->alt_ah_attr) &
97 IB_AH_GRH))
98 goto err;
99 grh = rdma_ah_read_grh(&qp->alt_ah_attr);
100 guid = get_sguid(ibp, grh->sgid_index);
101 if (!gid_ok(&hdr->u.l.grh.dgid,
102 ibp->rvp.gid_prefix, guid))
103 goto err;
104 if (!gid_ok(&hdr->u.l.grh.sgid,
105 grh->dgid.global.subnet_prefix,
106 grh->dgid.global.interface_id))
107 goto err;
108 }
109 if (!qib_pkey_ok((u16)bth0,
110 qib_get_pkey(ibp, qp->s_alt_pkey_index))) {
111 qib_bad_pkey(ibp,
112 (u16)bth0,
113 (be16_to_cpu(hdr->lrh[0]) >> 4) & 0xF,
114 0, qp->ibqp.qp_num,
115 hdr->lrh[3], hdr->lrh[1]);
116 goto err;
117 }
118 /* Validate the SLID. See Ch. 9.6.1.5 and 17.2.8 */
119 if ((be16_to_cpu(hdr->lrh[3]) !=
120 rdma_ah_get_dlid(&qp->alt_ah_attr)) ||
121 ppd_from_ibp(ibp)->port !=
122 rdma_ah_get_port_num(&qp->alt_ah_attr))
123 goto err;
124 spin_lock_irqsave(&qp->s_lock, flags);
125 qib_migrate_qp(qp);
126 spin_unlock_irqrestore(&qp->s_lock, flags);
127 } else {
128 if (!has_grh) {
129 if (rdma_ah_get_ah_flags(&qp->remote_ah_attr) &
130 IB_AH_GRH)
131 goto err;
132 } else {
133 const struct ib_global_route *grh;
134
135 if (!(rdma_ah_get_ah_flags(&qp->remote_ah_attr) &
136 IB_AH_GRH))
137 goto err;
138 grh = rdma_ah_read_grh(&qp->remote_ah_attr);
139 guid = get_sguid(ibp, grh->sgid_index);
140 if (!gid_ok(&hdr->u.l.grh.dgid,
141 ibp->rvp.gid_prefix, guid))
142 goto err;
143 if (!gid_ok(&hdr->u.l.grh.sgid,
144 grh->dgid.global.subnet_prefix,
145 grh->dgid.global.interface_id))
146 goto err;
147 }
148 if (!qib_pkey_ok((u16)bth0,
149 qib_get_pkey(ibp, qp->s_pkey_index))) {
150 qib_bad_pkey(ibp,
151 (u16)bth0,
152 (be16_to_cpu(hdr->lrh[0]) >> 4) & 0xF,
153 0, qp->ibqp.qp_num,
154 hdr->lrh[3], hdr->lrh[1]);
155 goto err;
156 }
157 /* Validate the SLID. See Ch. 9.6.1.5 */
158 if (be16_to_cpu(hdr->lrh[3]) !=
159 rdma_ah_get_dlid(&qp->remote_ah_attr) ||
160 ppd_from_ibp(ibp)->port != qp->port_num)
161 goto err;
162 if (qp->s_mig_state == IB_MIG_REARM &&
163 !(bth0 & IB_BTH_MIG_REQ))
164 qp->s_mig_state = IB_MIG_ARMED;
165 }
166
167 return 0;
168
169err:
170 return 1;
171}
172
173/**
174 * qib_make_grh - construct a GRH header
175 * @ibp: a pointer to the IB port
176 * @hdr: a pointer to the GRH header being constructed
177 * @grh: the global route address to send to
178 * @hwords: the number of 32 bit words of header being sent
179 * @nwords: the number of 32 bit words of data being sent
180 *
181 * Return the size of the header in 32 bit words.
182 */
183u32 qib_make_grh(struct qib_ibport *ibp, struct ib_grh *hdr,
184 const struct ib_global_route *grh, u32 hwords, u32 nwords)
185{
186 hdr->version_tclass_flow =
187 cpu_to_be32((IB_GRH_VERSION << IB_GRH_VERSION_SHIFT) |
188 (grh->traffic_class << IB_GRH_TCLASS_SHIFT) |
189 (grh->flow_label << IB_GRH_FLOW_SHIFT));
190 hdr->paylen = cpu_to_be16((hwords - 2 + nwords + SIZE_OF_CRC) << 2);
191 /* next_hdr is defined by C8-7 in ch. 8.4.1 */
192 hdr->next_hdr = IB_GRH_NEXT_HDR;
193 hdr->hop_limit = grh->hop_limit;
194 /* The SGID is 32-bit aligned. */
195 hdr->sgid.global.subnet_prefix = ibp->rvp.gid_prefix;
196 if (!grh->sgid_index)
197 hdr->sgid.global.interface_id = ppd_from_ibp(ibp)->guid;
198 else if (grh->sgid_index < QIB_GUIDS_PER_PORT)
199 hdr->sgid.global.interface_id = ibp->guids[grh->sgid_index - 1];
200 hdr->dgid = grh->dgid;
201
202 /* GRH header size in 32-bit words. */
203 return sizeof(struct ib_grh) / sizeof(u32);
204}
205
206void qib_make_ruc_header(struct rvt_qp *qp, struct ib_other_headers *ohdr,
207 u32 bth0, u32 bth2)
208{
209 struct qib_qp_priv *priv = qp->priv;
210 struct qib_ibport *ibp = to_iport(qp->ibqp.device, qp->port_num);
211 u16 lrh0;
212 u32 nwords;
213 u32 extra_bytes;
214
215 /* Construct the header. */
216 extra_bytes = -qp->s_cur_size & 3;
217 nwords = (qp->s_cur_size + extra_bytes) >> 2;
218 lrh0 = QIB_LRH_BTH;
219 if (unlikely(rdma_ah_get_ah_flags(&qp->remote_ah_attr) & IB_AH_GRH)) {
220 qp->s_hdrwords +=
221 qib_make_grh(ibp, &priv->s_hdr->u.l.grh,
222 rdma_ah_read_grh(&qp->remote_ah_attr),
223 qp->s_hdrwords, nwords);
224 lrh0 = QIB_LRH_GRH;
225 }
226 lrh0 |= ibp->sl_to_vl[rdma_ah_get_sl(&qp->remote_ah_attr)] << 12 |
227 rdma_ah_get_sl(&qp->remote_ah_attr) << 4;
228 priv->s_hdr->lrh[0] = cpu_to_be16(lrh0);
229 priv->s_hdr->lrh[1] =
230 cpu_to_be16(rdma_ah_get_dlid(&qp->remote_ah_attr));
231 priv->s_hdr->lrh[2] =
232 cpu_to_be16(qp->s_hdrwords + nwords + SIZE_OF_CRC);
233 priv->s_hdr->lrh[3] =
234 cpu_to_be16(ppd_from_ibp(ibp)->lid |
235 rdma_ah_get_path_bits(&qp->remote_ah_attr));
236 bth0 |= qib_get_pkey(ibp, qp->s_pkey_index);
237 bth0 |= extra_bytes << 20;
238 if (qp->s_mig_state == IB_MIG_MIGRATED)
239 bth0 |= IB_BTH_MIG_REQ;
240 ohdr->bth[0] = cpu_to_be32(bth0);
241 ohdr->bth[1] = cpu_to_be32(qp->remote_qpn);
242 ohdr->bth[2] = cpu_to_be32(bth2);
243 this_cpu_inc(ibp->pmastats->n_unicast_xmit);
244}
245
246void _qib_do_send(struct work_struct *work)
247{
248 struct qib_qp_priv *priv = container_of(work, struct qib_qp_priv,
249 s_work);
250 struct rvt_qp *qp = priv->owner;
251
252 qib_do_send(qp);
253}
254
255/**
256 * qib_do_send - perform a send on a QP
257 * @qp: pointer to the QP
258 *
259 * Process entries in the send work queue until credit or queue is
260 * exhausted. Only allow one CPU to send a packet per QP (tasklet).
261 * Otherwise, two threads could send packets out of order.
262 */
263void qib_do_send(struct rvt_qp *qp)
264{
265 struct qib_qp_priv *priv = qp->priv;
266 struct qib_ibport *ibp = to_iport(qp->ibqp.device, qp->port_num);
267 struct qib_pportdata *ppd = ppd_from_ibp(ibp);
268 int (*make_req)(struct rvt_qp *qp, unsigned long *flags);
269 unsigned long flags;
270
271 if ((qp->ibqp.qp_type == IB_QPT_RC ||
272 qp->ibqp.qp_type == IB_QPT_UC) &&
273 (rdma_ah_get_dlid(&qp->remote_ah_attr) &
274 ~((1 << ppd->lmc) - 1)) == ppd->lid) {
275 rvt_ruc_loopback(qp);
276 return;
277 }
278
279 if (qp->ibqp.qp_type == IB_QPT_RC)
280 make_req = qib_make_rc_req;
281 else if (qp->ibqp.qp_type == IB_QPT_UC)
282 make_req = qib_make_uc_req;
283 else
284 make_req = qib_make_ud_req;
285
286 spin_lock_irqsave(&qp->s_lock, flags);
287
288 /* Return if we are already busy processing a work request. */
289 if (!qib_send_ok(qp)) {
290 spin_unlock_irqrestore(&qp->s_lock, flags);
291 return;
292 }
293
294 qp->s_flags |= RVT_S_BUSY;
295
296 do {
297 /* Check for a constructed packet to be sent. */
298 if (qp->s_hdrwords != 0) {
299 spin_unlock_irqrestore(&qp->s_lock, flags);
300 /*
301 * If the packet cannot be sent now, return and
302 * the send tasklet will be woken up later.
303 */
304 if (qib_verbs_send(qp, priv->s_hdr, qp->s_hdrwords,
305 qp->s_cur_sge, qp->s_cur_size))
306 return;
307 /* Record that s_hdr is empty. */
308 qp->s_hdrwords = 0;
309 spin_lock_irqsave(&qp->s_lock, flags);
310 }
311 } while (make_req(qp, &flags));
312
313 spin_unlock_irqrestore(&qp->s_lock, flags);
314}
1/*
2 * Copyright (c) 2006, 2007, 2008, 2009 QLogic Corporation. All rights reserved.
3 * Copyright (c) 2005, 2006 PathScale, Inc. All rights reserved.
4 *
5 * This software is available to you under a choice of one of two
6 * licenses. You may choose to be licensed under the terms of the GNU
7 * General Public License (GPL) Version 2, available from the file
8 * COPYING in the main directory of this source tree, or the
9 * OpenIB.org BSD license below:
10 *
11 * Redistribution and use in source and binary forms, with or
12 * without modification, are permitted provided that the following
13 * conditions are met:
14 *
15 * - Redistributions of source code must retain the above
16 * copyright notice, this list of conditions and the following
17 * disclaimer.
18 *
19 * - Redistributions in binary form must reproduce the above
20 * copyright notice, this list of conditions and the following
21 * disclaimer in the documentation and/or other materials
22 * provided with the distribution.
23 *
24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
25 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
26 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
27 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
28 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
29 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
30 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
31 * SOFTWARE.
32 */
33
34#include <linux/spinlock.h>
35#include <rdma/ib_smi.h>
36
37#include "qib.h"
38#include "qib_mad.h"
39
40/*
41 * Switch to alternate path.
42 * The QP s_lock should be held and interrupts disabled.
43 */
44void qib_migrate_qp(struct rvt_qp *qp)
45{
46 struct ib_event ev;
47
48 qp->s_mig_state = IB_MIG_MIGRATED;
49 qp->remote_ah_attr = qp->alt_ah_attr;
50 qp->port_num = rdma_ah_get_port_num(&qp->alt_ah_attr);
51 qp->s_pkey_index = qp->s_alt_pkey_index;
52
53 ev.device = qp->ibqp.device;
54 ev.element.qp = &qp->ibqp;
55 ev.event = IB_EVENT_PATH_MIG;
56 qp->ibqp.event_handler(&ev, qp->ibqp.qp_context);
57}
58
59static __be64 get_sguid(struct qib_ibport *ibp, unsigned index)
60{
61 if (!index) {
62 struct qib_pportdata *ppd = ppd_from_ibp(ibp);
63
64 return ppd->guid;
65 }
66 return ibp->guids[index - 1];
67}
68
69static int gid_ok(union ib_gid *gid, __be64 gid_prefix, __be64 id)
70{
71 return (gid->global.interface_id == id &&
72 (gid->global.subnet_prefix == gid_prefix ||
73 gid->global.subnet_prefix == IB_DEFAULT_GID_PREFIX));
74}
75
76/*
77 *
78 * This should be called with the QP r_lock held.
79 *
80 * The s_lock will be acquired around the qib_migrate_qp() call.
81 */
82int qib_ruc_check_hdr(struct qib_ibport *ibp, struct ib_header *hdr,
83 int has_grh, struct rvt_qp *qp, u32 bth0)
84{
85 __be64 guid;
86 unsigned long flags;
87
88 if (qp->s_mig_state == IB_MIG_ARMED && (bth0 & IB_BTH_MIG_REQ)) {
89 if (!has_grh) {
90 if (rdma_ah_get_ah_flags(&qp->alt_ah_attr) &
91 IB_AH_GRH)
92 goto err;
93 } else {
94 const struct ib_global_route *grh;
95
96 if (!(rdma_ah_get_ah_flags(&qp->alt_ah_attr) &
97 IB_AH_GRH))
98 goto err;
99 grh = rdma_ah_read_grh(&qp->alt_ah_attr);
100 guid = get_sguid(ibp, grh->sgid_index);
101 if (!gid_ok(&hdr->u.l.grh.dgid,
102 ibp->rvp.gid_prefix, guid))
103 goto err;
104 if (!gid_ok(&hdr->u.l.grh.sgid,
105 grh->dgid.global.subnet_prefix,
106 grh->dgid.global.interface_id))
107 goto err;
108 }
109 if (!qib_pkey_ok((u16)bth0,
110 qib_get_pkey(ibp, qp->s_alt_pkey_index))) {
111 qib_bad_pkey(ibp,
112 (u16)bth0,
113 (be16_to_cpu(hdr->lrh[0]) >> 4) & 0xF,
114 0, qp->ibqp.qp_num,
115 hdr->lrh[3], hdr->lrh[1]);
116 goto err;
117 }
118 /* Validate the SLID. See Ch. 9.6.1.5 and 17.2.8 */
119 if ((be16_to_cpu(hdr->lrh[3]) !=
120 rdma_ah_get_dlid(&qp->alt_ah_attr)) ||
121 ppd_from_ibp(ibp)->port !=
122 rdma_ah_get_port_num(&qp->alt_ah_attr))
123 goto err;
124 spin_lock_irqsave(&qp->s_lock, flags);
125 qib_migrate_qp(qp);
126 spin_unlock_irqrestore(&qp->s_lock, flags);
127 } else {
128 if (!has_grh) {
129 if (rdma_ah_get_ah_flags(&qp->remote_ah_attr) &
130 IB_AH_GRH)
131 goto err;
132 } else {
133 const struct ib_global_route *grh;
134
135 if (!(rdma_ah_get_ah_flags(&qp->remote_ah_attr) &
136 IB_AH_GRH))
137 goto err;
138 grh = rdma_ah_read_grh(&qp->remote_ah_attr);
139 guid = get_sguid(ibp, grh->sgid_index);
140 if (!gid_ok(&hdr->u.l.grh.dgid,
141 ibp->rvp.gid_prefix, guid))
142 goto err;
143 if (!gid_ok(&hdr->u.l.grh.sgid,
144 grh->dgid.global.subnet_prefix,
145 grh->dgid.global.interface_id))
146 goto err;
147 }
148 if (!qib_pkey_ok((u16)bth0,
149 qib_get_pkey(ibp, qp->s_pkey_index))) {
150 qib_bad_pkey(ibp,
151 (u16)bth0,
152 (be16_to_cpu(hdr->lrh[0]) >> 4) & 0xF,
153 0, qp->ibqp.qp_num,
154 hdr->lrh[3], hdr->lrh[1]);
155 goto err;
156 }
157 /* Validate the SLID. See Ch. 9.6.1.5 */
158 if (be16_to_cpu(hdr->lrh[3]) !=
159 rdma_ah_get_dlid(&qp->remote_ah_attr) ||
160 ppd_from_ibp(ibp)->port != qp->port_num)
161 goto err;
162 if (qp->s_mig_state == IB_MIG_REARM &&
163 !(bth0 & IB_BTH_MIG_REQ))
164 qp->s_mig_state = IB_MIG_ARMED;
165 }
166
167 return 0;
168
169err:
170 return 1;
171}
172
173/**
174 * qib_make_grh - construct a GRH header
175 * @ibp: a pointer to the IB port
176 * @hdr: a pointer to the GRH header being constructed
177 * @grh: the global route address to send to
178 * @hwords: the number of 32 bit words of header being sent
179 * @nwords: the number of 32 bit words of data being sent
180 *
181 * Return the size of the header in 32 bit words.
182 */
183u32 qib_make_grh(struct qib_ibport *ibp, struct ib_grh *hdr,
184 const struct ib_global_route *grh, u32 hwords, u32 nwords)
185{
186 hdr->version_tclass_flow =
187 cpu_to_be32((IB_GRH_VERSION << IB_GRH_VERSION_SHIFT) |
188 (grh->traffic_class << IB_GRH_TCLASS_SHIFT) |
189 (grh->flow_label << IB_GRH_FLOW_SHIFT));
190 hdr->paylen = cpu_to_be16((hwords - 2 + nwords + SIZE_OF_CRC) << 2);
191 /* next_hdr is defined by C8-7 in ch. 8.4.1 */
192 hdr->next_hdr = IB_GRH_NEXT_HDR;
193 hdr->hop_limit = grh->hop_limit;
194 /* The SGID is 32-bit aligned. */
195 hdr->sgid.global.subnet_prefix = ibp->rvp.gid_prefix;
196 if (!grh->sgid_index)
197 hdr->sgid.global.interface_id = ppd_from_ibp(ibp)->guid;
198 else if (grh->sgid_index < QIB_GUIDS_PER_PORT)
199 hdr->sgid.global.interface_id = ibp->guids[grh->sgid_index - 1];
200 hdr->dgid = grh->dgid;
201
202 /* GRH header size in 32-bit words. */
203 return sizeof(struct ib_grh) / sizeof(u32);
204}
205
206void qib_make_ruc_header(struct rvt_qp *qp, struct ib_other_headers *ohdr,
207 u32 bth0, u32 bth2)
208{
209 struct qib_qp_priv *priv = qp->priv;
210 struct qib_ibport *ibp = to_iport(qp->ibqp.device, qp->port_num);
211 u16 lrh0;
212 u32 nwords;
213 u32 extra_bytes;
214
215 /* Construct the header. */
216 extra_bytes = -qp->s_cur_size & 3;
217 nwords = (qp->s_cur_size + extra_bytes) >> 2;
218 lrh0 = QIB_LRH_BTH;
219 if (unlikely(rdma_ah_get_ah_flags(&qp->remote_ah_attr) & IB_AH_GRH)) {
220 qp->s_hdrwords +=
221 qib_make_grh(ibp, &priv->s_hdr->u.l.grh,
222 rdma_ah_read_grh(&qp->remote_ah_attr),
223 qp->s_hdrwords, nwords);
224 lrh0 = QIB_LRH_GRH;
225 }
226 lrh0 |= ibp->sl_to_vl[rdma_ah_get_sl(&qp->remote_ah_attr)] << 12 |
227 rdma_ah_get_sl(&qp->remote_ah_attr) << 4;
228 priv->s_hdr->lrh[0] = cpu_to_be16(lrh0);
229 priv->s_hdr->lrh[1] =
230 cpu_to_be16(rdma_ah_get_dlid(&qp->remote_ah_attr));
231 priv->s_hdr->lrh[2] =
232 cpu_to_be16(qp->s_hdrwords + nwords + SIZE_OF_CRC);
233 priv->s_hdr->lrh[3] =
234 cpu_to_be16(ppd_from_ibp(ibp)->lid |
235 rdma_ah_get_path_bits(&qp->remote_ah_attr));
236 bth0 |= qib_get_pkey(ibp, qp->s_pkey_index);
237 bth0 |= extra_bytes << 20;
238 if (qp->s_mig_state == IB_MIG_MIGRATED)
239 bth0 |= IB_BTH_MIG_REQ;
240 ohdr->bth[0] = cpu_to_be32(bth0);
241 ohdr->bth[1] = cpu_to_be32(qp->remote_qpn);
242 ohdr->bth[2] = cpu_to_be32(bth2);
243 this_cpu_inc(ibp->pmastats->n_unicast_xmit);
244}
245
246void _qib_do_send(struct work_struct *work)
247{
248 struct qib_qp_priv *priv = container_of(work, struct qib_qp_priv,
249 s_work);
250 struct rvt_qp *qp = priv->owner;
251
252 qib_do_send(qp);
253}
254
255/**
256 * qib_do_send - perform a send on a QP
257 * @qp: pointer to the QP
258 *
259 * Process entries in the send work queue until credit or queue is
260 * exhausted. Only allow one CPU to send a packet per QP (tasklet).
261 * Otherwise, two threads could send packets out of order.
262 */
263void qib_do_send(struct rvt_qp *qp)
264{
265 struct qib_qp_priv *priv = qp->priv;
266 struct qib_ibport *ibp = to_iport(qp->ibqp.device, qp->port_num);
267 struct qib_pportdata *ppd = ppd_from_ibp(ibp);
268 int (*make_req)(struct rvt_qp *qp, unsigned long *flags);
269 unsigned long flags;
270
271 if ((qp->ibqp.qp_type == IB_QPT_RC ||
272 qp->ibqp.qp_type == IB_QPT_UC) &&
273 (rdma_ah_get_dlid(&qp->remote_ah_attr) &
274 ~((1 << ppd->lmc) - 1)) == ppd->lid) {
275 rvt_ruc_loopback(qp);
276 return;
277 }
278
279 if (qp->ibqp.qp_type == IB_QPT_RC)
280 make_req = qib_make_rc_req;
281 else if (qp->ibqp.qp_type == IB_QPT_UC)
282 make_req = qib_make_uc_req;
283 else
284 make_req = qib_make_ud_req;
285
286 spin_lock_irqsave(&qp->s_lock, flags);
287
288 /* Return if we are already busy processing a work request. */
289 if (!qib_send_ok(qp)) {
290 spin_unlock_irqrestore(&qp->s_lock, flags);
291 return;
292 }
293
294 qp->s_flags |= RVT_S_BUSY;
295
296 do {
297 /* Check for a constructed packet to be sent. */
298 if (qp->s_hdrwords != 0) {
299 spin_unlock_irqrestore(&qp->s_lock, flags);
300 /*
301 * If the packet cannot be sent now, return and
302 * the send tasklet will be woken up later.
303 */
304 if (qib_verbs_send(qp, priv->s_hdr, qp->s_hdrwords,
305 qp->s_cur_sge, qp->s_cur_size))
306 return;
307 /* Record that s_hdr is empty. */
308 qp->s_hdrwords = 0;
309 spin_lock_irqsave(&qp->s_lock, flags);
310 }
311 } while (make_req(qp, &flags));
312
313 spin_unlock_irqrestore(&qp->s_lock, flags);
314}