1 // SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
2 /*
3 * Copyright (c) 2020 Hewlett Packard Enterprise, Inc. All rights reserved.
4 */
5
6 #include "rxe.h"
7
rxe_alloc_mw(struct ib_mw * ibmw,struct ib_udata * udata)8 int rxe_alloc_mw(struct ib_mw *ibmw, struct ib_udata *udata)
9 {
10 struct rxe_mw *mw = to_rmw(ibmw);
11 struct rxe_pd *pd = to_rpd(ibmw->pd);
12 struct rxe_dev *rxe = to_rdev(ibmw->device);
13 int ret;
14
15 rxe_add_ref(pd);
16
17 ret = rxe_add_to_pool(&rxe->mw_pool, mw);
18 if (ret) {
19 rxe_drop_ref(pd);
20 return ret;
21 }
22
23 rxe_add_index(mw);
24 mw->rkey = ibmw->rkey = (mw->pelem.index << 8) | rxe_get_next_key(-1);
25 mw->state = (mw->ibmw.type == IB_MW_TYPE_2) ?
26 RXE_MW_STATE_FREE : RXE_MW_STATE_VALID;
27 spin_lock_init(&mw->lock);
28
29 return 0;
30 }
31
rxe_do_dealloc_mw(struct rxe_mw * mw)32 static void rxe_do_dealloc_mw(struct rxe_mw *mw)
33 {
34 if (mw->mr) {
35 struct rxe_mr *mr = mw->mr;
36
37 mw->mr = NULL;
38 atomic_dec(&mr->num_mw);
39 rxe_drop_ref(mr);
40 }
41
42 if (mw->qp) {
43 struct rxe_qp *qp = mw->qp;
44
45 mw->qp = NULL;
46 rxe_drop_ref(qp);
47 }
48
49 mw->access = 0;
50 mw->addr = 0;
51 mw->length = 0;
52 mw->state = RXE_MW_STATE_INVALID;
53 }
54
rxe_dealloc_mw(struct ib_mw * ibmw)55 int rxe_dealloc_mw(struct ib_mw *ibmw)
56 {
57 struct rxe_mw *mw = to_rmw(ibmw);
58 struct rxe_pd *pd = to_rpd(ibmw->pd);
59 unsigned long flags;
60
61 spin_lock_irqsave(&mw->lock, flags);
62 rxe_do_dealloc_mw(mw);
63 spin_unlock_irqrestore(&mw->lock, flags);
64
65 rxe_drop_ref(mw);
66 rxe_drop_ref(pd);
67
68 return 0;
69 }
70
rxe_check_bind_mw(struct rxe_qp * qp,struct rxe_send_wqe * wqe,struct rxe_mw * mw,struct rxe_mr * mr)71 static int rxe_check_bind_mw(struct rxe_qp *qp, struct rxe_send_wqe *wqe,
72 struct rxe_mw *mw, struct rxe_mr *mr)
73 {
74 if (mw->ibmw.type == IB_MW_TYPE_1) {
75 if (unlikely(mw->state != RXE_MW_STATE_VALID)) {
76 pr_err_once(
77 "attempt to bind a type 1 MW not in the valid state\n");
78 return -EINVAL;
79 }
80
81 /* o10-36.2.2 */
82 if (unlikely((mw->access & IB_ZERO_BASED))) {
83 pr_err_once("attempt to bind a zero based type 1 MW\n");
84 return -EINVAL;
85 }
86 }
87
88 if (mw->ibmw.type == IB_MW_TYPE_2) {
89 /* o10-37.2.30 */
90 if (unlikely(mw->state != RXE_MW_STATE_FREE)) {
91 pr_err_once(
92 "attempt to bind a type 2 MW not in the free state\n");
93 return -EINVAL;
94 }
95
96 /* C10-72 */
97 if (unlikely(qp->pd != to_rpd(mw->ibmw.pd))) {
98 pr_err_once(
99 "attempt to bind type 2 MW with qp with different PD\n");
100 return -EINVAL;
101 }
102
103 /* o10-37.2.40 */
104 if (unlikely(!mr || wqe->wr.wr.mw.length == 0)) {
105 pr_err_once(
106 "attempt to invalidate type 2 MW by binding with NULL or zero length MR\n");
107 return -EINVAL;
108 }
109 }
110
111 /* remaining checks only apply to a nonzero MR */
112 if (!mr)
113 return 0;
114
115 if (unlikely(mr->access & IB_ZERO_BASED)) {
116 pr_err_once("attempt to bind MW to zero based MR\n");
117 return -EINVAL;
118 }
119
120 /* C10-73 */
121 if (unlikely(!(mr->access & IB_ACCESS_MW_BIND))) {
122 pr_err_once(
123 "attempt to bind an MW to an MR without bind access\n");
124 return -EINVAL;
125 }
126
127 /* C10-74 */
128 if (unlikely((mw->access &
129 (IB_ACCESS_REMOTE_WRITE | IB_ACCESS_REMOTE_ATOMIC)) &&
130 !(mr->access & IB_ACCESS_LOCAL_WRITE))) {
131 pr_err_once(
132 "attempt to bind an writeable MW to an MR without local write access\n");
133 return -EINVAL;
134 }
135
136 /* C10-75 */
137 if (mw->access & IB_ZERO_BASED) {
138 if (unlikely(wqe->wr.wr.mw.length > mr->length)) {
139 pr_err_once(
140 "attempt to bind a ZB MW outside of the MR\n");
141 return -EINVAL;
142 }
143 } else {
144 if (unlikely((wqe->wr.wr.mw.addr < mr->iova) ||
145 ((wqe->wr.wr.mw.addr + wqe->wr.wr.mw.length) >
146 (mr->iova + mr->length)))) {
147 pr_err_once(
148 "attempt to bind a VA MW outside of the MR\n");
149 return -EINVAL;
150 }
151 }
152
153 return 0;
154 }
155
rxe_do_bind_mw(struct rxe_qp * qp,struct rxe_send_wqe * wqe,struct rxe_mw * mw,struct rxe_mr * mr)156 static void rxe_do_bind_mw(struct rxe_qp *qp, struct rxe_send_wqe *wqe,
157 struct rxe_mw *mw, struct rxe_mr *mr)
158 {
159 u32 key = wqe->wr.wr.mw.rkey & 0xff;
160
161 mw->rkey = (mw->rkey & ~0xff) | key;
162 mw->access = wqe->wr.wr.mw.access;
163 mw->state = RXE_MW_STATE_VALID;
164 mw->addr = wqe->wr.wr.mw.addr;
165 mw->length = wqe->wr.wr.mw.length;
166
167 if (mw->mr) {
168 rxe_drop_ref(mw->mr);
169 atomic_dec(&mw->mr->num_mw);
170 mw->mr = NULL;
171 }
172
173 if (mw->length) {
174 mw->mr = mr;
175 atomic_inc(&mr->num_mw);
176 rxe_add_ref(mr);
177 }
178
179 if (mw->ibmw.type == IB_MW_TYPE_2) {
180 rxe_add_ref(qp);
181 mw->qp = qp;
182 }
183 }
184
rxe_bind_mw(struct rxe_qp * qp,struct rxe_send_wqe * wqe)185 int rxe_bind_mw(struct rxe_qp *qp, struct rxe_send_wqe *wqe)
186 {
187 int ret;
188 struct rxe_mw *mw;
189 struct rxe_mr *mr;
190 struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
191 u32 mw_rkey = wqe->wr.wr.mw.mw_rkey;
192 u32 mr_lkey = wqe->wr.wr.mw.mr_lkey;
193 unsigned long flags;
194
195 mw = rxe_pool_get_index(&rxe->mw_pool, mw_rkey >> 8);
196 if (unlikely(!mw)) {
197 ret = -EINVAL;
198 goto err;
199 }
200
201 if (unlikely(mw->rkey != mw_rkey)) {
202 ret = -EINVAL;
203 goto err_drop_mw;
204 }
205
206 if (likely(wqe->wr.wr.mw.length)) {
207 mr = rxe_pool_get_index(&rxe->mr_pool, mr_lkey >> 8);
208 if (unlikely(!mr)) {
209 ret = -EINVAL;
210 goto err_drop_mw;
211 }
212
213 if (unlikely(mr->lkey != mr_lkey)) {
214 ret = -EINVAL;
215 goto err_drop_mr;
216 }
217 } else {
218 mr = NULL;
219 }
220
221 spin_lock_irqsave(&mw->lock, flags);
222
223 ret = rxe_check_bind_mw(qp, wqe, mw, mr);
224 if (ret)
225 goto err_unlock;
226
227 rxe_do_bind_mw(qp, wqe, mw, mr);
228 err_unlock:
229 spin_unlock_irqrestore(&mw->lock, flags);
230 err_drop_mr:
231 if (mr)
232 rxe_drop_ref(mr);
233 err_drop_mw:
234 rxe_drop_ref(mw);
235 err:
236 return ret;
237 }
238
rxe_check_invalidate_mw(struct rxe_qp * qp,struct rxe_mw * mw)239 static int rxe_check_invalidate_mw(struct rxe_qp *qp, struct rxe_mw *mw)
240 {
241 if (unlikely(mw->state == RXE_MW_STATE_INVALID))
242 return -EINVAL;
243
244 /* o10-37.2.26 */
245 if (unlikely(mw->ibmw.type == IB_MW_TYPE_1))
246 return -EINVAL;
247
248 return 0;
249 }
250
rxe_do_invalidate_mw(struct rxe_mw * mw)251 static void rxe_do_invalidate_mw(struct rxe_mw *mw)
252 {
253 struct rxe_qp *qp;
254 struct rxe_mr *mr;
255
256 /* valid type 2 MW will always have a QP pointer */
257 qp = mw->qp;
258 mw->qp = NULL;
259 rxe_drop_ref(qp);
260
261 /* valid type 2 MW will always have an MR pointer */
262 mr = mw->mr;
263 mw->mr = NULL;
264 atomic_dec(&mr->num_mw);
265 rxe_drop_ref(mr);
266
267 mw->access = 0;
268 mw->addr = 0;
269 mw->length = 0;
270 mw->state = RXE_MW_STATE_FREE;
271 }
272
rxe_invalidate_mw(struct rxe_qp * qp,u32 rkey)273 int rxe_invalidate_mw(struct rxe_qp *qp, u32 rkey)
274 {
275 struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
276 unsigned long flags;
277 struct rxe_mw *mw;
278 int ret;
279
280 mw = rxe_pool_get_index(&rxe->mw_pool, rkey >> 8);
281 if (!mw) {
282 ret = -EINVAL;
283 goto err;
284 }
285
286 if (rkey != mw->rkey) {
287 ret = -EINVAL;
288 goto err_drop_ref;
289 }
290
291 spin_lock_irqsave(&mw->lock, flags);
292
293 ret = rxe_check_invalidate_mw(qp, mw);
294 if (ret)
295 goto err_unlock;
296
297 rxe_do_invalidate_mw(mw);
298 err_unlock:
299 spin_unlock_irqrestore(&mw->lock, flags);
300 err_drop_ref:
301 rxe_drop_ref(mw);
302 err:
303 return ret;
304 }
305
rxe_lookup_mw(struct rxe_qp * qp,int access,u32 rkey)306 struct rxe_mw *rxe_lookup_mw(struct rxe_qp *qp, int access, u32 rkey)
307 {
308 struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
309 struct rxe_pd *pd = to_rpd(qp->ibqp.pd);
310 struct rxe_mw *mw;
311 int index = rkey >> 8;
312
313 mw = rxe_pool_get_index(&rxe->mw_pool, index);
314 if (!mw)
315 return NULL;
316
317 if (unlikely((mw->rkey != rkey) || rxe_mw_pd(mw) != pd ||
318 (mw->ibmw.type == IB_MW_TYPE_2 && mw->qp != qp) ||
319 (mw->length == 0) ||
320 (access && !(access & mw->access)) ||
321 mw->state != RXE_MW_STATE_VALID)) {
322 rxe_drop_ref(mw);
323 return NULL;
324 }
325
326 return mw;
327 }
328
rxe_mw_cleanup(struct rxe_pool_entry * elem)329 void rxe_mw_cleanup(struct rxe_pool_entry *elem)
330 {
331 struct rxe_mw *mw = container_of(elem, typeof(*mw), pelem);
332
333 rxe_drop_index(mw);
334 }
335