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, 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_rqtpool_create(rdev); 141 if (rc) { 142 device_printf(sc->dev, "error %d initializing rqt pool\n", rc); 143 goto err2; 144 } 145 rdev->status_page = (struct t4_dev_status_page *) 146 __get_free_page(GFP_KERNEL); 147 if (!rdev->status_page) { 148 rc = -ENOMEM; 149 goto err3; 150 } 151 rdev->status_page->qp_start = sc->vres.qp.start; 152 rdev->status_page->qp_size = sc->vres.qp.size; 153 rdev->status_page->cq_start = sc->vres.cq.start; 154 rdev->status_page->cq_size = sc->vres.cq.size; 155 156 /* T5 and above devices don't need Doorbell recovery logic, 157 * so db_off is always set to '0'. 158 */ 159 rdev->status_page->db_off = 0; 160 161 rdev->status_page->wc_supported = rdev->adap->iwt.wc_en; 162 163 rdev->free_workq = create_singlethread_workqueue("iw_cxgb4_free"); 164 if (!rdev->free_workq) { 165 rc = -ENOMEM; 166 goto err4; 167 } 168 return (0); 169 err4: 170 free_page((unsigned long)rdev->status_page); 171 err3: 172 c4iw_rqtpool_destroy(rdev); 173 err2: 174 c4iw_destroy_resource(&rdev->resource); 175 err1: 176 return (rc); 177 } 178 179 static void c4iw_rdev_close(struct c4iw_rdev *rdev) 180 { 181 free_page((unsigned long)rdev->status_page); 182 c4iw_rqtpool_destroy(rdev); 183 c4iw_destroy_resource(&rdev->resource); 184 } 185 186 static void 187 c4iw_dealloc(struct c4iw_dev *iwsc) 188 { 189 190 c4iw_rdev_close(&iwsc->rdev); 191 idr_destroy(&iwsc->cqidr); 192 idr_destroy(&iwsc->qpidr); 193 idr_destroy(&iwsc->mmidr); 194 ib_dealloc_device(&iwsc->ibdev); 195 } 196 197 static struct c4iw_dev * 198 c4iw_alloc(struct adapter *sc) 199 { 200 struct c4iw_dev *iwsc; 201 int rc; 202 203 iwsc = (struct c4iw_dev *)ib_alloc_device(sizeof(*iwsc)); 204 if (iwsc == NULL) { 205 device_printf(sc->dev, "Cannot allocate ib device.\n"); 206 return (ERR_PTR(-ENOMEM)); 207 } 208 iwsc->rdev.adap = sc; 209 210 /* init various hw-queue params based on lld info */ 211 iwsc->rdev.hw_queue.t4_eq_status_entries = 212 sc->params.sge.spg_len / EQ_ESIZE; 213 iwsc->rdev.hw_queue.t4_max_eq_size = 65520; 214 iwsc->rdev.hw_queue.t4_max_iq_size = 65520; 215 iwsc->rdev.hw_queue.t4_max_rq_size = 8192 - 216 iwsc->rdev.hw_queue.t4_eq_status_entries - 1; 217 iwsc->rdev.hw_queue.t4_max_sq_size = 218 iwsc->rdev.hw_queue.t4_max_eq_size - 219 iwsc->rdev.hw_queue.t4_eq_status_entries - 1; 220 iwsc->rdev.hw_queue.t4_max_qp_depth = 221 iwsc->rdev.hw_queue.t4_max_rq_size; 222 iwsc->rdev.hw_queue.t4_max_cq_depth = 223 iwsc->rdev.hw_queue.t4_max_iq_size - 2; 224 iwsc->rdev.hw_queue.t4_stat_len = iwsc->rdev.adap->params.sge.spg_len; 225 226 /* As T5 and above devices support BAR2 kernel doorbells & WC, we map 227 * all of BAR2, for both User and Kernel Doorbells-GTS. 228 */ 229 iwsc->rdev.bar2_kva = (void __iomem *)((u64)iwsc->rdev.adap->udbs_base); 230 iwsc->rdev.bar2_pa = vtophys(iwsc->rdev.adap->udbs_base); 231 iwsc->rdev.bar2_len = rman_get_size(iwsc->rdev.adap->udbs_res); 232 233 rc = c4iw_rdev_open(&iwsc->rdev); 234 if (rc != 0) { 235 device_printf(sc->dev, "Unable to open CXIO rdev (%d)\n", rc); 236 ib_dealloc_device(&iwsc->ibdev); 237 return (ERR_PTR(rc)); 238 } 239 240 idr_init(&iwsc->cqidr); 241 idr_init(&iwsc->qpidr); 242 idr_init(&iwsc->mmidr); 243 spin_lock_init(&iwsc->lock); 244 mutex_init(&iwsc->rdev.stats.lock); 245 iwsc->avail_ird = iwsc->rdev.adap->params.max_ird_adapter; 246 247 return (iwsc); 248 } 249 250 static int c4iw_mod_load(void); 251 static int c4iw_mod_unload(void); 252 static int c4iw_activate(struct adapter *); 253 static int c4iw_deactivate(struct adapter *); 254 static int c4iw_stop(struct adapter *); 255 static int c4iw_restart(struct adapter *); 256 257 static struct uld_info c4iw_uld_info = { 258 .uld_activate = c4iw_activate, 259 .uld_deactivate = c4iw_deactivate, 260 .uld_stop = c4iw_stop, 261 .uld_restart = c4iw_restart, 262 }; 263 264 static int 265 c4iw_activate(struct adapter *sc) 266 { 267 struct c4iw_dev *iwsc; 268 int rc; 269 270 ASSERT_SYNCHRONIZED_OP(sc); 271 272 if (is_t4(sc)) { 273 device_printf(sc->dev, "No iWARP support for T4 devices, " 274 "please install T5 or above devices.\n"); 275 return (ENOSYS); 276 } 277 278 if (uld_active(sc, ULD_IWARP)) { 279 KASSERT(0, ("%s: RDMA already enabled on sc %p", __func__, sc)); 280 return (0); 281 } 282 283 if (sc->rdmacaps == 0) { 284 device_printf(sc->dev, 285 "RDMA not supported or RDMA cap is not enabled.\n"); 286 return (ENOSYS); 287 } 288 289 iwsc = c4iw_alloc(sc); 290 if (IS_ERR(iwsc)) { 291 rc = -PTR_ERR(iwsc); 292 device_printf(sc->dev, "initialization failed: %d\n", rc); 293 return (rc); 294 } 295 296 sc->iwarp_softc = iwsc; 297 298 rc = -c4iw_register_device(iwsc); 299 if (rc) { 300 device_printf(sc->dev, "RDMA registration failed: %d\n", rc); 301 c4iw_dealloc(iwsc); 302 sc->iwarp_softc = NULL; 303 } 304 305 return (rc); 306 } 307 308 static int 309 c4iw_deactivate(struct adapter *sc) 310 { 311 struct c4iw_dev *iwsc = sc->iwarp_softc; 312 313 ASSERT_SYNCHRONIZED_OP(sc); 314 315 c4iw_unregister_device(iwsc); 316 c4iw_dealloc(iwsc); 317 sc->iwarp_softc = NULL; 318 319 return (0); 320 } 321 322 static int 323 c4iw_stop(struct adapter *sc) 324 { 325 struct c4iw_dev *iwsc = sc->iwarp_softc; 326 327 if (iwsc) { 328 struct ib_event event = {0}; 329 330 device_printf(sc->dev, "iWARP driver stopped.\n"); 331 iwsc->rdev.flags |= T4_IW_STOPPED; 332 event.event = IB_EVENT_DEVICE_FATAL; 333 event.device = &iwsc->ibdev; 334 ib_dispatch_event(&event); 335 } 336 337 return (0); 338 } 339 340 static int 341 c4iw_restart(struct adapter *sc) 342 { 343 struct c4iw_dev *iwsc = sc->iwarp_softc; 344 345 if (iwsc) { 346 device_printf(sc->dev, "iWARP driver restarted.\n"); 347 iwsc->rdev.flags &= ~T4_IW_STOPPED; 348 } 349 return (0); 350 } 351 352 static void 353 c4iw_activate_all(struct adapter *sc, void *arg __unused) 354 { 355 356 if (begin_synchronized_op(sc, NULL, SLEEP_OK | INTR_OK, "t4iwact") != 0) 357 return; 358 359 /* Activate iWARP if any port on this adapter has IFCAP_TOE enabled. */ 360 if (sc->offload_map && !uld_active(sc, ULD_IWARP)) 361 (void) t4_activate_uld(sc, ULD_IWARP); 362 363 end_synchronized_op(sc, 0); 364 } 365 366 static void 367 c4iw_deactivate_all(struct adapter *sc, void *arg __unused) 368 { 369 370 if (begin_synchronized_op(sc, NULL, SLEEP_OK | INTR_OK, "t4iwdea") != 0) 371 return; 372 373 if (uld_active(sc, ULD_IWARP)) 374 (void) t4_deactivate_uld(sc, ULD_IWARP); 375 376 end_synchronized_op(sc, 0); 377 } 378 379 static int 380 c4iw_mod_load(void) 381 { 382 int rc; 383 384 rc = -c4iw_cm_init(); 385 if (rc != 0) 386 return (rc); 387 388 rc = t4_register_uld(&c4iw_uld_info, ULD_IWARP); 389 if (rc != 0) { 390 c4iw_cm_term(); 391 return (rc); 392 } 393 394 t4_iterate(c4iw_activate_all, NULL); 395 396 return (rc); 397 } 398 399 static int 400 c4iw_mod_unload(void) 401 { 402 403 t4_iterate(c4iw_deactivate_all, NULL); 404 405 c4iw_cm_term(); 406 407 if (t4_unregister_uld(&c4iw_uld_info, ULD_IWARP) == EBUSY) 408 return (EBUSY); 409 410 return (0); 411 } 412 413 #endif 414 415 /* 416 * t4_tom won't load on kernels without TCP_OFFLOAD and this module's dependency 417 * on t4_tom ensures that it won't either. So we don't directly check for 418 * TCP_OFFLOAD here. 419 */ 420 static int 421 c4iw_modevent(module_t mod, int cmd, void *arg) 422 { 423 int rc = 0; 424 425 #ifdef TCP_OFFLOAD 426 switch (cmd) { 427 case MOD_LOAD: 428 rc = c4iw_mod_load(); 429 if (rc == 0) 430 printf("iw_cxgbe: Chelsio T5/T6 RDMA driver loaded.\n"); 431 break; 432 433 case MOD_UNLOAD: 434 rc = c4iw_mod_unload(); 435 break; 436 437 default: 438 rc = EINVAL; 439 } 440 #else 441 printf("t4_tom: compiled without TCP_OFFLOAD support.\n"); 442 rc = EOPNOTSUPP; 443 #endif 444 return (rc); 445 } 446 447 static moduledata_t c4iw_mod_data = { 448 "iw_cxgbe", 449 c4iw_modevent, 450 0 451 }; 452 453 MODULE_VERSION(iw_cxgbe, 1); 454 MODULE_DEPEND(iw_cxgbe, t4nex, 1, 1, 1); 455 MODULE_DEPEND(iw_cxgbe, t4_tom, 1, 1, 1); 456 MODULE_DEPEND(iw_cxgbe, ibcore, 1, 1, 1); 457 MODULE_DEPEND(iw_cxgbe, linuxkpi, 1, 1, 1); 458 DECLARE_MODULE(iw_cxgbe, c4iw_mod_data, SI_SUB_EXEC, SI_ORDER_ANY); 459