1 /* Broadcom NetXtreme-C/E network driver. 2 * 3 * Copyright (c) 2016-2018 Broadcom Limited 4 * 5 * This program is free software; you can redistribute it and/or modify 6 * it under the terms of the GNU General Public License as published by 7 * the Free Software Foundation. 8 */ 9 10 #include <linux/module.h> 11 12 #include <linux/kernel.h> 13 #include <linux/errno.h> 14 #include <linux/interrupt.h> 15 #include <linux/pci.h> 16 #include <linux/netdevice.h> 17 #include <linux/rtnetlink.h> 18 #include <linux/bitops.h> 19 #include <linux/irq.h> 20 #include <asm/byteorder.h> 21 #include <linux/bitmap.h> 22 #include <linux/auxiliary_bus.h> 23 #include <net/netdev_lock.h> 24 #include <linux/bnxt/hsi.h> 25 26 #include "bnxt.h" 27 #include "bnxt_hwrm.h" 28 #include "bnxt_ulp.h" 29 30 static DEFINE_IDA(bnxt_aux_dev_ids); 31 32 static void bnxt_fill_msix_vecs(struct bnxt *bp, struct bnxt_msix_entry *ent) 33 { 34 struct bnxt_en_dev *edev = bp->edev; 35 int num_msix, i; 36 37 if (!edev->ulp_tbl->msix_requested) { 38 netdev_warn(bp->dev, "Requested MSI-X vectors insufficient\n"); 39 return; 40 } 41 num_msix = edev->ulp_tbl->msix_requested; 42 for (i = 0; i < num_msix; i++) { 43 ent[i].vector = bp->irq_tbl[i].vector; 44 ent[i].ring_idx = i; 45 if (bp->flags & BNXT_FLAG_CHIP_P5_PLUS) 46 ent[i].db_offset = bp->db_offset; 47 else 48 ent[i].db_offset = i * 0x80; 49 } 50 } 51 52 int bnxt_get_ulp_msix_num(struct bnxt *bp) 53 { 54 if (bp->edev) 55 return bp->edev->ulp_num_msix_vec; 56 return 0; 57 } 58 59 void bnxt_set_ulp_msix_num(struct bnxt *bp, int num) 60 { 61 if (bp->edev) 62 bp->edev->ulp_num_msix_vec = num; 63 } 64 65 int bnxt_get_ulp_msix_num_in_use(struct bnxt *bp) 66 { 67 if (bnxt_ulp_registered(bp->edev)) 68 return bp->edev->ulp_num_msix_vec; 69 return 0; 70 } 71 72 int bnxt_get_ulp_stat_ctxs(struct bnxt *bp) 73 { 74 if (bp->edev) 75 return bp->edev->ulp_num_ctxs; 76 return 0; 77 } 78 79 void bnxt_set_ulp_stat_ctxs(struct bnxt *bp, int num_ulp_ctx) 80 { 81 if (bp->edev) 82 bp->edev->ulp_num_ctxs = num_ulp_ctx; 83 } 84 85 int bnxt_get_ulp_stat_ctxs_in_use(struct bnxt *bp) 86 { 87 if (bnxt_ulp_registered(bp->edev)) 88 return bp->edev->ulp_num_ctxs; 89 return 0; 90 } 91 92 void bnxt_set_dflt_ulp_stat_ctxs(struct bnxt *bp) 93 { 94 if (bp->edev) { 95 bp->edev->ulp_num_ctxs = BNXT_MIN_ROCE_STAT_CTXS; 96 /* Reserve one additional stat_ctx for PF0 (except 97 * on 1-port NICs) as it also creates one stat_ctx 98 * for PF1 in case of RoCE bonding. 99 */ 100 if (BNXT_PF(bp) && !bp->pf.port_id && 101 bp->port_count > 1) 102 bp->edev->ulp_num_ctxs++; 103 104 /* Reserve one additional stat_ctx when the device is capable 105 * of supporting port mirroring on RDMA device. 106 */ 107 if (BNXT_MIRROR_ON_ROCE_CAP(bp)) 108 bp->edev->ulp_num_ctxs++; 109 } 110 } 111 112 int bnxt_register_dev(struct bnxt_en_dev *edev, 113 struct bnxt_ulp_ops *ulp_ops, 114 void *handle) 115 { 116 struct net_device *dev = edev->net; 117 struct bnxt *bp = netdev_priv(dev); 118 unsigned int max_stat_ctxs; 119 struct bnxt_ulp *ulp; 120 int rc = 0; 121 122 netdev_lock(dev); 123 mutex_lock(&edev->en_dev_lock); 124 if (!bp->irq_tbl) { 125 rc = -ENODEV; 126 goto exit; 127 } 128 max_stat_ctxs = bnxt_get_max_func_stat_ctxs(bp); 129 if (max_stat_ctxs <= BNXT_MIN_ROCE_STAT_CTXS || 130 bp->cp_nr_rings == max_stat_ctxs) { 131 rc = -ENOMEM; 132 goto exit; 133 } 134 135 ulp = edev->ulp_tbl; 136 ulp->handle = handle; 137 rcu_assign_pointer(ulp->ulp_ops, ulp_ops); 138 139 if (test_bit(BNXT_STATE_OPEN, &bp->state)) 140 bnxt_hwrm_vnic_cfg(bp, &bp->vnic_info[BNXT_VNIC_DEFAULT]); 141 142 edev->ulp_tbl->msix_requested = bnxt_get_ulp_msix_num(bp); 143 144 bnxt_fill_msix_vecs(bp, bp->edev->msix_entries); 145 exit: 146 mutex_unlock(&edev->en_dev_lock); 147 netdev_unlock(dev); 148 return rc; 149 } 150 EXPORT_SYMBOL(bnxt_register_dev); 151 152 void bnxt_unregister_dev(struct bnxt_en_dev *edev) 153 { 154 struct net_device *dev = edev->net; 155 struct bnxt *bp = netdev_priv(dev); 156 struct bnxt_ulp *ulp; 157 158 ulp = edev->ulp_tbl; 159 netdev_lock(dev); 160 mutex_lock(&edev->en_dev_lock); 161 edev->ulp_tbl->msix_requested = 0; 162 163 if (ulp->max_async_event_id) 164 bnxt_hwrm_func_drv_rgtr(bp, NULL, 0, true); 165 166 RCU_INIT_POINTER(ulp->ulp_ops, NULL); 167 synchronize_rcu(); 168 ulp->max_async_event_id = 0; 169 ulp->async_events_bmap = NULL; 170 mutex_unlock(&edev->en_dev_lock); 171 netdev_unlock(dev); 172 return; 173 } 174 EXPORT_SYMBOL(bnxt_unregister_dev); 175 176 static int bnxt_set_dflt_ulp_msix(struct bnxt *bp) 177 { 178 int roce_msix = BNXT_MAX_ROCE_MSIX; 179 180 if (BNXT_VF(bp)) 181 roce_msix = BNXT_MAX_ROCE_MSIX_VF; 182 else if (bp->port_partition_type) 183 roce_msix = BNXT_MAX_ROCE_MSIX_NPAR_PF; 184 185 /* NQ MSIX vectors should match the number of CPUs plus 1 more for 186 * the CREQ MSIX, up to the default. 187 */ 188 return min_t(int, roce_msix, num_online_cpus() + 1); 189 } 190 191 int bnxt_send_msg(struct bnxt_en_dev *edev, 192 struct bnxt_fw_msg *fw_msg) 193 { 194 struct net_device *dev = edev->net; 195 struct bnxt *bp = netdev_priv(dev); 196 struct output *resp; 197 struct input *req; 198 u32 resp_len; 199 int rc; 200 201 if (bp->fw_reset_state) 202 return -EBUSY; 203 204 rc = hwrm_req_init(bp, req, 0 /* don't care */); 205 if (rc) 206 return rc; 207 208 rc = hwrm_req_replace(bp, req, fw_msg->msg, fw_msg->msg_len); 209 if (rc) 210 goto drop_req; 211 212 hwrm_req_timeout(bp, req, fw_msg->timeout); 213 resp = hwrm_req_hold(bp, req); 214 rc = hwrm_req_send(bp, req); 215 resp_len = le16_to_cpu(resp->resp_len); 216 if (resp_len) { 217 if (fw_msg->resp_max_len < resp_len) 218 resp_len = fw_msg->resp_max_len; 219 220 memcpy(fw_msg->resp, resp, resp_len); 221 } 222 drop_req: 223 hwrm_req_drop(bp, req); 224 return rc; 225 } 226 EXPORT_SYMBOL(bnxt_send_msg); 227 228 void bnxt_ulp_stop(struct bnxt *bp) 229 { 230 struct bnxt_aux_priv *aux_priv = bp->aux_priv; 231 struct bnxt_en_dev *edev = bp->edev; 232 233 if (!edev) 234 return; 235 236 mutex_lock(&edev->en_dev_lock); 237 if (!bnxt_ulp_registered(edev) || 238 (edev->flags & BNXT_EN_FLAG_ULP_STOPPED)) 239 goto ulp_stop_exit; 240 241 edev->flags |= BNXT_EN_FLAG_ULP_STOPPED; 242 if (aux_priv) { 243 struct auxiliary_device *adev; 244 245 adev = &aux_priv->aux_dev; 246 if (adev->dev.driver) { 247 const struct auxiliary_driver *adrv; 248 pm_message_t pm = {}; 249 250 adrv = to_auxiliary_drv(adev->dev.driver); 251 edev->en_state = bp->state; 252 adrv->suspend(adev, pm); 253 } 254 } 255 ulp_stop_exit: 256 mutex_unlock(&edev->en_dev_lock); 257 } 258 259 void bnxt_ulp_start(struct bnxt *bp, int err) 260 { 261 struct bnxt_aux_priv *aux_priv = bp->aux_priv; 262 struct bnxt_en_dev *edev = bp->edev; 263 264 if (!edev || err) 265 return; 266 267 mutex_lock(&edev->en_dev_lock); 268 if (!bnxt_ulp_registered(edev) || 269 !(edev->flags & BNXT_EN_FLAG_ULP_STOPPED)) 270 goto ulp_start_exit; 271 272 if (edev->ulp_tbl->msix_requested) 273 bnxt_fill_msix_vecs(bp, edev->msix_entries); 274 275 if (aux_priv) { 276 struct auxiliary_device *adev; 277 278 adev = &aux_priv->aux_dev; 279 if (adev->dev.driver) { 280 const struct auxiliary_driver *adrv; 281 282 adrv = to_auxiliary_drv(adev->dev.driver); 283 edev->en_state = bp->state; 284 adrv->resume(adev); 285 } 286 } 287 ulp_start_exit: 288 edev->flags &= ~BNXT_EN_FLAG_ULP_STOPPED; 289 mutex_unlock(&edev->en_dev_lock); 290 } 291 292 void bnxt_ulp_irq_stop(struct bnxt *bp) 293 { 294 struct bnxt_en_dev *edev = bp->edev; 295 struct bnxt_ulp_ops *ops; 296 bool reset = false; 297 298 if (!edev) 299 return; 300 301 if (bnxt_ulp_registered(bp->edev)) { 302 struct bnxt_ulp *ulp = edev->ulp_tbl; 303 304 if (!ulp->msix_requested) 305 return; 306 307 ops = netdev_lock_dereference(ulp->ulp_ops, bp->dev); 308 if (!ops || !ops->ulp_irq_stop) 309 return; 310 if (test_bit(BNXT_STATE_FW_RESET_DET, &bp->state)) 311 reset = true; 312 ops->ulp_irq_stop(ulp->handle, reset); 313 } 314 } 315 316 void bnxt_ulp_irq_restart(struct bnxt *bp, int err) 317 { 318 struct bnxt_en_dev *edev = bp->edev; 319 struct bnxt_ulp_ops *ops; 320 321 if (!edev) 322 return; 323 324 if (bnxt_ulp_registered(bp->edev)) { 325 struct bnxt_ulp *ulp = edev->ulp_tbl; 326 struct bnxt_msix_entry *ent = NULL; 327 328 if (!ulp->msix_requested) 329 return; 330 331 ops = netdev_lock_dereference(ulp->ulp_ops, bp->dev); 332 if (!ops || !ops->ulp_irq_restart) 333 return; 334 335 if (!err) { 336 ent = kzalloc_objs(*ent, ulp->msix_requested); 337 if (!ent) 338 return; 339 bnxt_fill_msix_vecs(bp, ent); 340 } 341 ops->ulp_irq_restart(ulp->handle, ent); 342 kfree(ent); 343 } 344 } 345 346 void bnxt_ulp_async_events(struct bnxt *bp, struct hwrm_async_event_cmpl *cmpl) 347 { 348 u16 event_id = le16_to_cpu(cmpl->event_id); 349 struct bnxt_en_dev *edev = bp->edev; 350 struct bnxt_ulp_ops *ops; 351 struct bnxt_ulp *ulp; 352 353 if (!bnxt_ulp_registered(edev)) 354 return; 355 ulp = edev->ulp_tbl; 356 357 rcu_read_lock(); 358 359 ops = rcu_dereference(ulp->ulp_ops); 360 if (!ops || !ops->ulp_async_notifier) 361 goto exit_unlock_rcu; 362 if (!ulp->async_events_bmap || event_id > ulp->max_async_event_id) 363 goto exit_unlock_rcu; 364 365 /* Read max_async_event_id first before testing the bitmap. */ 366 smp_rmb(); 367 368 if (test_bit(event_id, ulp->async_events_bmap)) 369 ops->ulp_async_notifier(ulp->handle, cmpl); 370 exit_unlock_rcu: 371 rcu_read_unlock(); 372 } 373 374 void bnxt_register_async_events(struct bnxt_en_dev *edev, 375 unsigned long *events_bmap, u16 max_id) 376 { 377 struct net_device *dev = edev->net; 378 struct bnxt *bp = netdev_priv(dev); 379 struct bnxt_ulp *ulp; 380 381 ulp = edev->ulp_tbl; 382 ulp->async_events_bmap = events_bmap; 383 /* Make sure bnxt_ulp_async_events() sees this order */ 384 smp_wmb(); 385 ulp->max_async_event_id = max_id; 386 bnxt_hwrm_func_drv_rgtr(bp, events_bmap, max_id + 1, true); 387 } 388 EXPORT_SYMBOL(bnxt_register_async_events); 389 390 void bnxt_rdma_aux_device_uninit(struct bnxt *bp) 391 { 392 struct bnxt_aux_priv *aux_priv; 393 struct auxiliary_device *adev; 394 395 /* Skip if no auxiliary device init was done. */ 396 if (!bp->aux_priv) 397 return; 398 399 aux_priv = bp->aux_priv; 400 adev = &aux_priv->aux_dev; 401 auxiliary_device_uninit(adev); 402 } 403 404 static void bnxt_aux_dev_release(struct device *dev) 405 { 406 struct bnxt_aux_priv *aux_priv = 407 container_of(dev, struct bnxt_aux_priv, aux_dev.dev); 408 struct bnxt *bp = netdev_priv(aux_priv->edev->net); 409 410 ida_free(&bnxt_aux_dev_ids, aux_priv->id); 411 kfree(aux_priv->edev->ulp_tbl); 412 bp->edev = NULL; 413 kfree(aux_priv->edev); 414 kfree(aux_priv); 415 bp->aux_priv = NULL; 416 } 417 418 void bnxt_rdma_aux_device_del(struct bnxt *bp) 419 { 420 if (!bp->edev) 421 return; 422 423 auxiliary_device_delete(&bp->aux_priv->aux_dev); 424 } 425 426 static void bnxt_set_edev_info(struct bnxt_en_dev *edev, struct bnxt *bp) 427 { 428 edev->net = bp->dev; 429 edev->pdev = bp->pdev; 430 edev->l2_db_size = bp->db_size; 431 edev->l2_db_size_nc = bp->db_size; 432 edev->l2_db_offset = bp->db_offset; 433 mutex_init(&edev->en_dev_lock); 434 435 if (bp->flags & BNXT_FLAG_ROCEV1_CAP) 436 edev->flags |= BNXT_EN_FLAG_ROCEV1_CAP; 437 if (bp->flags & BNXT_FLAG_ROCEV2_CAP) 438 edev->flags |= BNXT_EN_FLAG_ROCEV2_CAP; 439 if (bp->flags & BNXT_FLAG_VF) 440 edev->flags |= BNXT_EN_FLAG_VF; 441 if (BNXT_ROCE_VF_RESC_CAP(bp)) 442 edev->flags |= BNXT_EN_FLAG_ROCE_VF_RES_MGMT; 443 if (BNXT_SW_RES_LMT(bp)) 444 edev->flags |= BNXT_EN_FLAG_SW_RES_LMT; 445 446 edev->chip_num = bp->chip_num; 447 edev->hw_ring_stats_size = bp->hw_ring_stats_size; 448 edev->pf_port_id = bp->pf.port_id; 449 edev->en_state = bp->state; 450 edev->bar0 = bp->bar0; 451 } 452 453 void bnxt_rdma_aux_device_add(struct bnxt *bp) 454 { 455 struct auxiliary_device *aux_dev; 456 int rc; 457 458 if (!bp->edev) 459 return; 460 461 aux_dev = &bp->aux_priv->aux_dev; 462 rc = auxiliary_device_add(aux_dev); 463 if (rc) { 464 netdev_warn(bp->dev, "Failed to add auxiliary device for ROCE\n"); 465 auxiliary_device_uninit(aux_dev); 466 bp->flags &= ~BNXT_FLAG_ROCE_CAP; 467 } 468 } 469 470 void bnxt_rdma_aux_device_init(struct bnxt *bp) 471 { 472 struct auxiliary_device *aux_dev; 473 struct bnxt_aux_priv *aux_priv; 474 struct bnxt_en_dev *edev; 475 struct bnxt_ulp *ulp; 476 int rc; 477 478 if (!(bp->flags & BNXT_FLAG_ROCE_CAP)) 479 return; 480 481 aux_priv = kzalloc_obj(*bp->aux_priv); 482 if (!aux_priv) 483 goto exit; 484 485 aux_priv->id = ida_alloc(&bnxt_aux_dev_ids, GFP_KERNEL); 486 if (aux_priv->id < 0) { 487 netdev_warn(bp->dev, 488 "ida alloc failed for ROCE auxiliary device\n"); 489 kfree(aux_priv); 490 goto exit; 491 } 492 493 aux_dev = &aux_priv->aux_dev; 494 aux_dev->id = aux_priv->id; 495 aux_dev->name = "rdma"; 496 aux_dev->dev.parent = &bp->pdev->dev; 497 aux_dev->dev.release = bnxt_aux_dev_release; 498 499 rc = auxiliary_device_init(aux_dev); 500 if (rc) { 501 ida_free(&bnxt_aux_dev_ids, aux_priv->id); 502 kfree(aux_priv); 503 goto exit; 504 } 505 bp->aux_priv = aux_priv; 506 507 /* From this point, all cleanup will happen via the .release callback & 508 * any error unwinding will need to include a call to 509 * auxiliary_device_uninit. 510 */ 511 edev = kzalloc_obj(*edev); 512 if (!edev) 513 goto aux_dev_uninit; 514 515 aux_priv->edev = edev; 516 517 ulp = kzalloc_obj(*ulp); 518 if (!ulp) 519 goto aux_dev_uninit; 520 521 edev->ulp_tbl = ulp; 522 bp->edev = edev; 523 bnxt_set_edev_info(edev, bp); 524 bp->ulp_num_msix_want = bnxt_set_dflt_ulp_msix(bp); 525 526 return; 527 528 aux_dev_uninit: 529 auxiliary_device_uninit(aux_dev); 530 exit: 531 bp->flags &= ~BNXT_FLAG_ROCE_CAP; 532 } 533