1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2009-2013 Chelsio, Inc. All rights reserved. 5 * 6 * This software is available to you under a choice of one of two 7 * licenses. You may choose to be licensed under the terms of the GNU 8 * General Public License (GPL) Version 2, available from the file 9 * COPYING in the main directory of this source tree, or the 10 * OpenIB.org BSD license below: 11 * 12 * Redistribution and use in source and binary forms, with or 13 * without modification, are permitted provided that the following 14 * conditions are met: 15 * 16 * - Redistributions of source code must retain the above 17 * copyright notice, this list of conditions and the following 18 * disclaimer. 19 * 20 * - Redistributions in binary form must reproduce the above 21 * copyright notice, this list of conditions and the following 22 * disclaimer in the documentation and/or other materials 23 * provided with the distribution. 24 * 25 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 26 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 27 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 28 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 29 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 30 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 31 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 32 * SOFTWARE. 33 */ 34 #include <sys/cdefs.h> 35 #include "opt_inet.h" 36 37 #include <sys/ktr.h> 38 39 #include <linux/module.h> 40 #include <linux/moduleparam.h> 41 42 #include <rdma/ib_verbs.h> 43 #include <linux/idr.h> 44 45 #ifdef TCP_OFFLOAD 46 #include "iw_cxgbe.h" 47 48 void 49 c4iw_release_dev_ucontext(struct c4iw_rdev *rdev, 50 struct c4iw_dev_ucontext *uctx) 51 { 52 struct list_head *pos, *nxt; 53 struct c4iw_qid_list *entry; 54 55 mutex_lock(&uctx->lock); 56 list_for_each_safe(pos, nxt, &uctx->qpids) { 57 entry = list_entry(pos, struct c4iw_qid_list, entry); 58 list_del_init(&entry->entry); 59 if (!(entry->qid & rdev->qpmask)) { 60 c4iw_put_resource(&rdev->resource.qid_table, 61 entry->qid); 62 mutex_lock(&rdev->stats.lock); 63 rdev->stats.qid.cur -= rdev->qpmask + 1; 64 mutex_unlock(&rdev->stats.lock); 65 } 66 kfree(entry); 67 } 68 69 list_for_each_safe(pos, nxt, &uctx->cqids) { 70 entry = list_entry(pos, struct c4iw_qid_list, entry); 71 list_del_init(&entry->entry); 72 kfree(entry); 73 } 74 mutex_unlock(&uctx->lock); 75 } 76 77 void 78 c4iw_init_dev_ucontext(struct c4iw_rdev *rdev, struct c4iw_dev_ucontext *uctx) 79 { 80 81 INIT_LIST_HEAD(&uctx->qpids); 82 INIT_LIST_HEAD(&uctx->cqids); 83 mutex_init(&uctx->lock); 84 } 85 86 static int 87 c4iw_rdev_open(struct c4iw_rdev *rdev) 88 { 89 struct adapter *sc = rdev->adap; 90 struct sge_params *sp = &sc->params.sge; 91 int rc; 92 unsigned short ucq_density = 1 << sp->iq_s_qpp; /* # of user CQs/page */ 93 unsigned short udb_density = 1 << sp->eq_s_qpp; /* # of user DB/page */ 94 95 96 c4iw_init_dev_ucontext(rdev, &rdev->uctx); 97 98 /* 99 * This implementation assumes udb_density == ucq_density! Eventually 100 * we might need to support this but for now fail the open. Also the 101 * cqid and qpid range must match for now. 102 */ 103 if (udb_density != ucq_density) { 104 device_printf(sc->dev, "unsupported udb/ucq densities %u/%u\n", 105 udb_density, ucq_density); 106 rc = -EINVAL; 107 goto err1; 108 } 109 if (sc->vres.qp.start != sc->vres.cq.start || 110 sc->vres.qp.size != sc->vres.cq.size) { 111 device_printf(sc->dev, "%s: unsupported qp and cq id ranges " 112 "qp start %u size %u cq start %u size %u\n", __func__, 113 sc->vres.qp.start, sc->vres.qp.size, sc->vres.cq.start, 114 sc->vres.cq.size); 115 rc = -EINVAL; 116 goto err1; 117 } 118 119 rdev->qpshift = PAGE_SHIFT - sp->eq_s_qpp; 120 rdev->qpmask = udb_density - 1; 121 rdev->cqshift = PAGE_SHIFT - sp->iq_s_qpp; 122 rdev->cqmask = ucq_density - 1; 123 124 if (c4iw_num_stags(rdev) == 0) { 125 rc = -EINVAL; 126 goto err1; 127 } 128 129 rdev->stats.pd.total = T4_MAX_NUM_PD; 130 rdev->stats.stag.total = sc->vres.stag.size; 131 rdev->stats.pbl.total = sc->vres.pbl.size; 132 rdev->stats.rqt.total = sc->vres.rq.size; 133 rdev->stats.qid.total = sc->vres.qp.size; 134 135 rc = c4iw_init_resource(rdev, c4iw_num_stags(rdev), T4_MAX_NUM_PD); 136 if (rc) { 137 device_printf(sc->dev, "error %d initializing resources\n", rc); 138 goto err1; 139 } 140 rc = c4iw_pblpool_create(rdev); 141 if (rc) { 142 device_printf(sc->dev, "error %d initializing pbl pool\n", rc); 143 goto err2; 144 } 145 rc = c4iw_rqtpool_create(rdev); 146 if (rc) { 147 device_printf(sc->dev, "error %d initializing rqt pool\n", rc); 148 goto err3; 149 } 150 rdev->status_page = (struct t4_dev_status_page *) 151 __get_free_page(GFP_KERNEL); 152 if (!rdev->status_page) { 153 rc = -ENOMEM; 154 goto err4; 155 } 156 rdev->status_page->qp_start = sc->vres.qp.start; 157 rdev->status_page->qp_size = sc->vres.qp.size; 158 rdev->status_page->cq_start = sc->vres.cq.start; 159 rdev->status_page->cq_size = sc->vres.cq.size; 160 161 /* T5 and above devices don't need Doorbell recovery logic, 162 * so db_off is always set to '0'. 163 */ 164 rdev->status_page->db_off = 0; 165 166 rdev->status_page->wc_supported = rdev->adap->iwt.wc_en; 167 168 rdev->free_workq = create_singlethread_workqueue("iw_cxgb4_free"); 169 if (!rdev->free_workq) { 170 rc = -ENOMEM; 171 goto err5; 172 } 173 return (0); 174 err5: 175 free_page((unsigned long)rdev->status_page); 176 err4: 177 c4iw_rqtpool_destroy(rdev); 178 err3: 179 c4iw_pblpool_destroy(rdev); 180 err2: 181 c4iw_destroy_resource(&rdev->resource); 182 err1: 183 return (rc); 184 } 185 186 static void c4iw_rdev_close(struct c4iw_rdev *rdev) 187 { 188 free_page((unsigned long)rdev->status_page); 189 c4iw_pblpool_destroy(rdev); 190 c4iw_rqtpool_destroy(rdev); 191 c4iw_destroy_resource(&rdev->resource); 192 } 193 194 static void 195 c4iw_dealloc(struct c4iw_dev *iwsc) 196 { 197 198 c4iw_rdev_close(&iwsc->rdev); 199 idr_destroy(&iwsc->cqidr); 200 idr_destroy(&iwsc->qpidr); 201 idr_destroy(&iwsc->mmidr); 202 ib_dealloc_device(&iwsc->ibdev); 203 } 204 205 static struct c4iw_dev * 206 c4iw_alloc(struct adapter *sc) 207 { 208 struct c4iw_dev *iwsc; 209 int rc; 210 211 iwsc = (struct c4iw_dev *)ib_alloc_device(sizeof(*iwsc)); 212 if (iwsc == NULL) { 213 device_printf(sc->dev, "Cannot allocate ib device.\n"); 214 return (ERR_PTR(-ENOMEM)); 215 } 216 iwsc->rdev.adap = sc; 217 218 /* init various hw-queue params based on lld info */ 219 iwsc->rdev.hw_queue.t4_eq_status_entries = 220 sc->params.sge.spg_len / EQ_ESIZE; 221 iwsc->rdev.hw_queue.t4_max_eq_size = 65520; 222 iwsc->rdev.hw_queue.t4_max_iq_size = 65520; 223 iwsc->rdev.hw_queue.t4_max_rq_size = 8192 - 224 iwsc->rdev.hw_queue.t4_eq_status_entries - 1; 225 iwsc->rdev.hw_queue.t4_max_sq_size = 226 iwsc->rdev.hw_queue.t4_max_eq_size - 227 iwsc->rdev.hw_queue.t4_eq_status_entries - 1; 228 iwsc->rdev.hw_queue.t4_max_qp_depth = 229 iwsc->rdev.hw_queue.t4_max_rq_size; 230 iwsc->rdev.hw_queue.t4_max_cq_depth = 231 iwsc->rdev.hw_queue.t4_max_iq_size - 2; 232 iwsc->rdev.hw_queue.t4_stat_len = iwsc->rdev.adap->params.sge.spg_len; 233 234 /* As T5 and above devices support BAR2 kernel doorbells & WC, we map 235 * all of BAR2, for both User and Kernel Doorbells-GTS. 236 */ 237 iwsc->rdev.bar2_kva = (void __iomem *)((u64)iwsc->rdev.adap->udbs_base); 238 iwsc->rdev.bar2_pa = vtophys(iwsc->rdev.adap->udbs_base); 239 iwsc->rdev.bar2_len = rman_get_size(iwsc->rdev.adap->udbs_res); 240 241 rc = c4iw_rdev_open(&iwsc->rdev); 242 if (rc != 0) { 243 device_printf(sc->dev, "Unable to open CXIO rdev (%d)\n", rc); 244 ib_dealloc_device(&iwsc->ibdev); 245 return (ERR_PTR(rc)); 246 } 247 248 idr_init(&iwsc->cqidr); 249 idr_init(&iwsc->qpidr); 250 idr_init(&iwsc->mmidr); 251 spin_lock_init(&iwsc->lock); 252 mutex_init(&iwsc->rdev.stats.lock); 253 iwsc->avail_ird = iwsc->rdev.adap->params.max_ird_adapter; 254 255 return (iwsc); 256 } 257 258 static int c4iw_mod_load(void); 259 static int c4iw_mod_unload(void); 260 static int c4iw_activate(struct adapter *); 261 static int c4iw_deactivate(struct adapter *); 262 static int c4iw_stop(struct adapter *); 263 264 static struct uld_info c4iw_uld_info = { 265 .uld_activate = c4iw_activate, 266 .uld_deactivate = c4iw_deactivate, 267 .uld_stop = c4iw_stop, 268 }; 269 270 static int 271 c4iw_activate(struct adapter *sc) 272 { 273 struct c4iw_dev *iwsc; 274 int rc; 275 276 ASSERT_SYNCHRONIZED_OP(sc); 277 278 if (is_t4(sc)) { 279 device_printf(sc->dev, "No iWARP support for T4 devices, " 280 "please install T5 or above devices.\n"); 281 return (ENOSYS); 282 } 283 284 if (uld_active(sc, ULD_IWARP)) { 285 KASSERT(0, ("%s: RDMA already eanbled on sc %p", __func__, sc)); 286 return (0); 287 } 288 289 if (sc->rdmacaps == 0) { 290 device_printf(sc->dev, 291 "RDMA not supported or RDMA cap is not enabled.\n"); 292 return (ENOSYS); 293 } 294 295 iwsc = c4iw_alloc(sc); 296 if (IS_ERR(iwsc)) { 297 rc = -PTR_ERR(iwsc); 298 device_printf(sc->dev, "initialization failed: %d\n", rc); 299 return (rc); 300 } 301 302 sc->iwarp_softc = iwsc; 303 304 rc = -c4iw_register_device(iwsc); 305 if (rc) { 306 device_printf(sc->dev, "RDMA registration failed: %d\n", rc); 307 c4iw_dealloc(iwsc); 308 sc->iwarp_softc = NULL; 309 } 310 311 return (rc); 312 } 313 314 static int 315 c4iw_deactivate(struct adapter *sc) 316 { 317 struct c4iw_dev *iwsc = sc->iwarp_softc; 318 319 ASSERT_SYNCHRONIZED_OP(sc); 320 321 c4iw_unregister_device(iwsc); 322 c4iw_dealloc(iwsc); 323 sc->iwarp_softc = NULL; 324 325 return (0); 326 } 327 328 static int 329 c4iw_stop(struct adapter *sc) 330 { 331 struct c4iw_dev *iwsc = sc->iwarp_softc; 332 333 if (iwsc) { 334 struct ib_event event = {0}; 335 336 device_printf(sc->dev, 337 "iWARP driver received FATAL ERROR event.\n"); 338 iwsc->rdev.flags |= T4_FATAL_ERROR; 339 event.event = IB_EVENT_DEVICE_FATAL; 340 event.device = &iwsc->ibdev; 341 ib_dispatch_event(&event); 342 } 343 344 return (0); 345 } 346 347 static void 348 c4iw_activate_all(struct adapter *sc, void *arg __unused) 349 { 350 351 if (begin_synchronized_op(sc, NULL, SLEEP_OK | INTR_OK, "t4iwact") != 0) 352 return; 353 354 /* Activate iWARP if any port on this adapter has IFCAP_TOE enabled. */ 355 if (sc->offload_map && !uld_active(sc, ULD_IWARP)) 356 (void) t4_activate_uld(sc, ULD_IWARP); 357 358 end_synchronized_op(sc, 0); 359 } 360 361 static void 362 c4iw_deactivate_all(struct adapter *sc, void *arg __unused) 363 { 364 365 if (begin_synchronized_op(sc, NULL, SLEEP_OK | INTR_OK, "t4iwdea") != 0) 366 return; 367 368 if (uld_active(sc, ULD_IWARP)) 369 (void) t4_deactivate_uld(sc, ULD_IWARP); 370 371 end_synchronized_op(sc, 0); 372 } 373 374 static int 375 c4iw_mod_load(void) 376 { 377 int rc; 378 379 rc = -c4iw_cm_init(); 380 if (rc != 0) 381 return (rc); 382 383 rc = t4_register_uld(&c4iw_uld_info, ULD_IWARP); 384 if (rc != 0) { 385 c4iw_cm_term(); 386 return (rc); 387 } 388 389 t4_iterate(c4iw_activate_all, NULL); 390 391 return (rc); 392 } 393 394 static int 395 c4iw_mod_unload(void) 396 { 397 398 t4_iterate(c4iw_deactivate_all, NULL); 399 400 c4iw_cm_term(); 401 402 if (t4_unregister_uld(&c4iw_uld_info, ULD_IWARP) == EBUSY) 403 return (EBUSY); 404 405 return (0); 406 } 407 408 #endif 409 410 /* 411 * t4_tom won't load on kernels without TCP_OFFLOAD and this module's dependency 412 * on t4_tom ensures that it won't either. So we don't directly check for 413 * TCP_OFFLOAD here. 414 */ 415 static int 416 c4iw_modevent(module_t mod, int cmd, void *arg) 417 { 418 int rc = 0; 419 420 #ifdef TCP_OFFLOAD 421 switch (cmd) { 422 case MOD_LOAD: 423 rc = c4iw_mod_load(); 424 if (rc == 0) 425 printf("iw_cxgbe: Chelsio T5/T6 RDMA driver loaded.\n"); 426 break; 427 428 case MOD_UNLOAD: 429 rc = c4iw_mod_unload(); 430 break; 431 432 default: 433 rc = EINVAL; 434 } 435 #else 436 printf("t4_tom: compiled without TCP_OFFLOAD support.\n"); 437 rc = EOPNOTSUPP; 438 #endif 439 return (rc); 440 } 441 442 static moduledata_t c4iw_mod_data = { 443 "iw_cxgbe", 444 c4iw_modevent, 445 0 446 }; 447 448 MODULE_VERSION(iw_cxgbe, 1); 449 MODULE_DEPEND(iw_cxgbe, t4nex, 1, 1, 1); 450 MODULE_DEPEND(iw_cxgbe, t4_tom, 1, 1, 1); 451 MODULE_DEPEND(iw_cxgbe, ibcore, 1, 1, 1); 452 MODULE_DEPEND(iw_cxgbe, linuxkpi, 1, 1, 1); 453 DECLARE_MODULE(iw_cxgbe, c4iw_mod_data, SI_SUB_EXEC, SI_ORDER_ANY); 454