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 24 #include "bnxt_hsi.h" 25 #include "bnxt.h" 26 #include "bnxt_hwrm.h" 27 #include "bnxt_ulp.h" 28 29 static DEFINE_IDA(bnxt_aux_dev_ids); 30 31 static void bnxt_fill_msix_vecs(struct bnxt *bp, struct bnxt_msix_entry *ent) 32 { 33 struct bnxt_en_dev *edev = bp->edev; 34 int num_msix, i; 35 36 if (!edev->ulp_tbl->msix_requested) { 37 netdev_warn(bp->dev, "Requested MSI-X vectors insufficient\n"); 38 return; 39 } 40 num_msix = edev->ulp_tbl->msix_requested; 41 for (i = 0; i < num_msix; i++) { 42 ent[i].vector = bp->irq_tbl[i].vector; 43 ent[i].ring_idx = i; 44 if (bp->flags & BNXT_FLAG_CHIP_P5_PLUS) 45 ent[i].db_offset = bp->db_offset; 46 else 47 ent[i].db_offset = i * 0x80; 48 } 49 } 50 51 int bnxt_get_ulp_msix_num(struct bnxt *bp) 52 { 53 if (bp->edev) 54 return bp->edev->ulp_num_msix_vec; 55 return 0; 56 } 57 58 void bnxt_set_ulp_msix_num(struct bnxt *bp, int num) 59 { 60 if (bp->edev) 61 bp->edev->ulp_num_msix_vec = num; 62 } 63 64 int bnxt_get_ulp_msix_num_in_use(struct bnxt *bp) 65 { 66 if (bnxt_ulp_registered(bp->edev)) 67 return bp->edev->ulp_num_msix_vec; 68 return 0; 69 } 70 71 int bnxt_get_ulp_stat_ctxs(struct bnxt *bp) 72 { 73 if (bp->edev) 74 return bp->edev->ulp_num_ctxs; 75 return 0; 76 } 77 78 void bnxt_set_ulp_stat_ctxs(struct bnxt *bp, int num_ulp_ctx) 79 { 80 if (bp->edev) 81 bp->edev->ulp_num_ctxs = num_ulp_ctx; 82 } 83 84 int bnxt_get_ulp_stat_ctxs_in_use(struct bnxt *bp) 85 { 86 if (bnxt_ulp_registered(bp->edev)) 87 return bp->edev->ulp_num_ctxs; 88 return 0; 89 } 90 91 void bnxt_set_dflt_ulp_stat_ctxs(struct bnxt *bp) 92 { 93 if (bp->edev) { 94 bp->edev->ulp_num_ctxs = BNXT_MIN_ROCE_STAT_CTXS; 95 /* Reserve one additional stat_ctx for PF0 (except 96 * on 1-port NICs) as it also creates one stat_ctx 97 * for PF1 in case of RoCE bonding. 98 */ 99 if (BNXT_PF(bp) && !bp->pf.port_id && 100 bp->port_count > 1) 101 bp->edev->ulp_num_ctxs++; 102 } 103 } 104 105 int bnxt_register_dev(struct bnxt_en_dev *edev, 106 struct bnxt_ulp_ops *ulp_ops, 107 void *handle) 108 { 109 struct net_device *dev = edev->net; 110 struct bnxt *bp = netdev_priv(dev); 111 unsigned int max_stat_ctxs; 112 struct bnxt_ulp *ulp; 113 int rc = 0; 114 115 netdev_lock(dev); 116 mutex_lock(&edev->en_dev_lock); 117 if (!bp->irq_tbl) { 118 rc = -ENODEV; 119 goto exit; 120 } 121 max_stat_ctxs = bnxt_get_max_func_stat_ctxs(bp); 122 if (max_stat_ctxs <= BNXT_MIN_ROCE_STAT_CTXS || 123 bp->cp_nr_rings == max_stat_ctxs) { 124 rc = -ENOMEM; 125 goto exit; 126 } 127 128 ulp = edev->ulp_tbl; 129 ulp->handle = handle; 130 rcu_assign_pointer(ulp->ulp_ops, ulp_ops); 131 132 if (test_bit(BNXT_STATE_OPEN, &bp->state)) 133 bnxt_hwrm_vnic_cfg(bp, &bp->vnic_info[BNXT_VNIC_DEFAULT]); 134 135 edev->ulp_tbl->msix_requested = bnxt_get_ulp_msix_num(bp); 136 137 bnxt_fill_msix_vecs(bp, bp->edev->msix_entries); 138 edev->flags |= BNXT_EN_FLAG_MSIX_REQUESTED; 139 exit: 140 mutex_unlock(&edev->en_dev_lock); 141 netdev_unlock(dev); 142 return rc; 143 } 144 EXPORT_SYMBOL(bnxt_register_dev); 145 146 void bnxt_unregister_dev(struct bnxt_en_dev *edev) 147 { 148 struct net_device *dev = edev->net; 149 struct bnxt *bp = netdev_priv(dev); 150 struct bnxt_ulp *ulp; 151 152 ulp = edev->ulp_tbl; 153 netdev_lock(dev); 154 mutex_lock(&edev->en_dev_lock); 155 if (ulp->msix_requested) 156 edev->flags &= ~BNXT_EN_FLAG_MSIX_REQUESTED; 157 edev->ulp_tbl->msix_requested = 0; 158 159 if (ulp->max_async_event_id) 160 bnxt_hwrm_func_drv_rgtr(bp, NULL, 0, true); 161 162 RCU_INIT_POINTER(ulp->ulp_ops, NULL); 163 synchronize_rcu(); 164 ulp->max_async_event_id = 0; 165 ulp->async_events_bmap = NULL; 166 mutex_unlock(&edev->en_dev_lock); 167 netdev_unlock(dev); 168 return; 169 } 170 EXPORT_SYMBOL(bnxt_unregister_dev); 171 172 static int bnxt_set_dflt_ulp_msix(struct bnxt *bp) 173 { 174 int roce_msix = BNXT_MAX_ROCE_MSIX; 175 176 if (BNXT_VF(bp)) 177 roce_msix = BNXT_MAX_ROCE_MSIX_VF; 178 else if (bp->port_partition_type) 179 roce_msix = BNXT_MAX_ROCE_MSIX_NPAR_PF; 180 181 /* NQ MSIX vectors should match the number of CPUs plus 1 more for 182 * the CREQ MSIX, up to the default. 183 */ 184 return min_t(int, roce_msix, num_online_cpus() + 1); 185 } 186 187 int bnxt_send_msg(struct bnxt_en_dev *edev, 188 struct bnxt_fw_msg *fw_msg) 189 { 190 struct net_device *dev = edev->net; 191 struct bnxt *bp = netdev_priv(dev); 192 struct output *resp; 193 struct input *req; 194 u32 resp_len; 195 int rc; 196 197 if (bp->fw_reset_state) 198 return -EBUSY; 199 200 rc = hwrm_req_init(bp, req, 0 /* don't care */); 201 if (rc) 202 return rc; 203 204 rc = hwrm_req_replace(bp, req, fw_msg->msg, fw_msg->msg_len); 205 if (rc) 206 goto drop_req; 207 208 hwrm_req_timeout(bp, req, fw_msg->timeout); 209 resp = hwrm_req_hold(bp, req); 210 rc = hwrm_req_send(bp, req); 211 resp_len = le16_to_cpu(resp->resp_len); 212 if (resp_len) { 213 if (fw_msg->resp_max_len < resp_len) 214 resp_len = fw_msg->resp_max_len; 215 216 memcpy(fw_msg->resp, resp, resp_len); 217 } 218 drop_req: 219 hwrm_req_drop(bp, req); 220 return rc; 221 } 222 EXPORT_SYMBOL(bnxt_send_msg); 223 224 void bnxt_ulp_stop(struct bnxt *bp) 225 { 226 struct bnxt_aux_priv *aux_priv = bp->aux_priv; 227 struct bnxt_en_dev *edev = bp->edev; 228 229 if (!edev) 230 return; 231 232 mutex_lock(&edev->en_dev_lock); 233 if (!bnxt_ulp_registered(edev)) { 234 mutex_unlock(&edev->en_dev_lock); 235 return; 236 } 237 238 edev->flags |= BNXT_EN_FLAG_ULP_STOPPED; 239 if (aux_priv) { 240 struct auxiliary_device *adev; 241 242 adev = &aux_priv->aux_dev; 243 if (adev->dev.driver) { 244 const struct auxiliary_driver *adrv; 245 pm_message_t pm = {}; 246 247 adrv = to_auxiliary_drv(adev->dev.driver); 248 edev->en_state = bp->state; 249 adrv->suspend(adev, pm); 250 } 251 } 252 mutex_unlock(&edev->en_dev_lock); 253 } 254 255 void bnxt_ulp_start(struct bnxt *bp, int err) 256 { 257 struct bnxt_aux_priv *aux_priv = bp->aux_priv; 258 struct bnxt_en_dev *edev = bp->edev; 259 260 if (!edev) 261 return; 262 263 edev->flags &= ~BNXT_EN_FLAG_ULP_STOPPED; 264 265 if (err) 266 return; 267 268 mutex_lock(&edev->en_dev_lock); 269 if (!bnxt_ulp_registered(edev)) { 270 mutex_unlock(&edev->en_dev_lock); 271 return; 272 } 273 274 if (edev->ulp_tbl->msix_requested) 275 bnxt_fill_msix_vecs(bp, edev->msix_entries); 276 277 if (aux_priv) { 278 struct auxiliary_device *adev; 279 280 adev = &aux_priv->aux_dev; 281 if (adev->dev.driver) { 282 const struct auxiliary_driver *adrv; 283 284 adrv = to_auxiliary_drv(adev->dev.driver); 285 edev->en_state = bp->state; 286 adrv->resume(adev); 287 } 288 } 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 || !(edev->flags & BNXT_EN_FLAG_MSIX_REQUESTED)) 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 netdev_lock(bp->dev); 308 ops = rcu_dereference(ulp->ulp_ops); 309 if (!ops || !ops->ulp_irq_stop) 310 return; 311 if (test_bit(BNXT_STATE_FW_RESET_DET, &bp->state)) 312 reset = true; 313 ops->ulp_irq_stop(ulp->handle, reset); 314 netdev_unlock(bp->dev); 315 } 316 } 317 318 void bnxt_ulp_irq_restart(struct bnxt *bp, int err) 319 { 320 struct bnxt_en_dev *edev = bp->edev; 321 struct bnxt_ulp_ops *ops; 322 323 if (!edev || !(edev->flags & BNXT_EN_FLAG_MSIX_REQUESTED)) 324 return; 325 326 if (bnxt_ulp_registered(bp->edev)) { 327 struct bnxt_ulp *ulp = edev->ulp_tbl; 328 struct bnxt_msix_entry *ent = NULL; 329 330 if (!ulp->msix_requested) 331 return; 332 333 netdev_lock(bp->dev); 334 ops = rcu_dereference(ulp->ulp_ops); 335 if (!ops || !ops->ulp_irq_restart) 336 return; 337 338 if (!err) { 339 ent = kcalloc(ulp->msix_requested, sizeof(*ent), 340 GFP_KERNEL); 341 if (!ent) 342 return; 343 bnxt_fill_msix_vecs(bp, ent); 344 } 345 ops->ulp_irq_restart(ulp->handle, ent); 346 netdev_unlock(bp->dev); 347 kfree(ent); 348 } 349 } 350 351 void bnxt_ulp_async_events(struct bnxt *bp, struct hwrm_async_event_cmpl *cmpl) 352 { 353 u16 event_id = le16_to_cpu(cmpl->event_id); 354 struct bnxt_en_dev *edev = bp->edev; 355 struct bnxt_ulp_ops *ops; 356 struct bnxt_ulp *ulp; 357 358 if (!bnxt_ulp_registered(edev)) 359 return; 360 ulp = edev->ulp_tbl; 361 362 rcu_read_lock(); 363 364 ops = rcu_dereference(ulp->ulp_ops); 365 if (!ops || !ops->ulp_async_notifier) 366 goto exit_unlock_rcu; 367 if (!ulp->async_events_bmap || event_id > ulp->max_async_event_id) 368 goto exit_unlock_rcu; 369 370 /* Read max_async_event_id first before testing the bitmap. */ 371 smp_rmb(); 372 373 if (test_bit(event_id, ulp->async_events_bmap)) 374 ops->ulp_async_notifier(ulp->handle, cmpl); 375 exit_unlock_rcu: 376 rcu_read_unlock(); 377 } 378 379 void bnxt_register_async_events(struct bnxt_en_dev *edev, 380 unsigned long *events_bmap, u16 max_id) 381 { 382 struct net_device *dev = edev->net; 383 struct bnxt *bp = netdev_priv(dev); 384 struct bnxt_ulp *ulp; 385 386 ulp = edev->ulp_tbl; 387 ulp->async_events_bmap = events_bmap; 388 /* Make sure bnxt_ulp_async_events() sees this order */ 389 smp_wmb(); 390 ulp->max_async_event_id = max_id; 391 bnxt_hwrm_func_drv_rgtr(bp, events_bmap, max_id + 1, true); 392 } 393 EXPORT_SYMBOL(bnxt_register_async_events); 394 395 void bnxt_rdma_aux_device_uninit(struct bnxt *bp) 396 { 397 struct bnxt_aux_priv *aux_priv; 398 struct auxiliary_device *adev; 399 400 /* Skip if no auxiliary device init was done. */ 401 if (!bp->aux_priv) 402 return; 403 404 aux_priv = bp->aux_priv; 405 adev = &aux_priv->aux_dev; 406 auxiliary_device_uninit(adev); 407 } 408 409 static void bnxt_aux_dev_release(struct device *dev) 410 { 411 struct bnxt_aux_priv *aux_priv = 412 container_of(dev, struct bnxt_aux_priv, aux_dev.dev); 413 struct bnxt *bp = netdev_priv(aux_priv->edev->net); 414 415 ida_free(&bnxt_aux_dev_ids, aux_priv->id); 416 kfree(aux_priv->edev->ulp_tbl); 417 bp->edev = NULL; 418 kfree(aux_priv->edev); 419 kfree(aux_priv); 420 bp->aux_priv = NULL; 421 } 422 423 void bnxt_rdma_aux_device_del(struct bnxt *bp) 424 { 425 if (!bp->edev) 426 return; 427 428 auxiliary_device_delete(&bp->aux_priv->aux_dev); 429 } 430 431 static void bnxt_set_edev_info(struct bnxt_en_dev *edev, struct bnxt *bp) 432 { 433 edev->net = bp->dev; 434 edev->pdev = bp->pdev; 435 edev->l2_db_size = bp->db_size; 436 edev->l2_db_size_nc = bp->db_size; 437 edev->l2_db_offset = bp->db_offset; 438 mutex_init(&edev->en_dev_lock); 439 440 if (bp->flags & BNXT_FLAG_ROCEV1_CAP) 441 edev->flags |= BNXT_EN_FLAG_ROCEV1_CAP; 442 if (bp->flags & BNXT_FLAG_ROCEV2_CAP) 443 edev->flags |= BNXT_EN_FLAG_ROCEV2_CAP; 444 if (bp->flags & BNXT_FLAG_VF) 445 edev->flags |= BNXT_EN_FLAG_VF; 446 if (BNXT_ROCE_VF_RESC_CAP(bp)) 447 edev->flags |= BNXT_EN_FLAG_ROCE_VF_RES_MGMT; 448 if (BNXT_SW_RES_LMT(bp)) 449 edev->flags |= BNXT_EN_FLAG_SW_RES_LMT; 450 451 edev->chip_num = bp->chip_num; 452 edev->hw_ring_stats_size = bp->hw_ring_stats_size; 453 edev->pf_port_id = bp->pf.port_id; 454 edev->en_state = bp->state; 455 edev->bar0 = bp->bar0; 456 } 457 458 void bnxt_rdma_aux_device_add(struct bnxt *bp) 459 { 460 struct auxiliary_device *aux_dev; 461 int rc; 462 463 if (!bp->edev) 464 return; 465 466 aux_dev = &bp->aux_priv->aux_dev; 467 rc = auxiliary_device_add(aux_dev); 468 if (rc) { 469 netdev_warn(bp->dev, "Failed to add auxiliary device for ROCE\n"); 470 auxiliary_device_uninit(aux_dev); 471 bp->flags &= ~BNXT_FLAG_ROCE_CAP; 472 } 473 } 474 475 void bnxt_rdma_aux_device_init(struct bnxt *bp) 476 { 477 struct auxiliary_device *aux_dev; 478 struct bnxt_aux_priv *aux_priv; 479 struct bnxt_en_dev *edev; 480 struct bnxt_ulp *ulp; 481 int rc; 482 483 if (!(bp->flags & BNXT_FLAG_ROCE_CAP)) 484 return; 485 486 aux_priv = kzalloc(sizeof(*bp->aux_priv), GFP_KERNEL); 487 if (!aux_priv) 488 goto exit; 489 490 aux_priv->id = ida_alloc(&bnxt_aux_dev_ids, GFP_KERNEL); 491 if (aux_priv->id < 0) { 492 netdev_warn(bp->dev, 493 "ida alloc failed for ROCE auxiliary device\n"); 494 kfree(aux_priv); 495 goto exit; 496 } 497 498 aux_dev = &aux_priv->aux_dev; 499 aux_dev->id = aux_priv->id; 500 aux_dev->name = "rdma"; 501 aux_dev->dev.parent = &bp->pdev->dev; 502 aux_dev->dev.release = bnxt_aux_dev_release; 503 504 rc = auxiliary_device_init(aux_dev); 505 if (rc) { 506 ida_free(&bnxt_aux_dev_ids, aux_priv->id); 507 kfree(aux_priv); 508 goto exit; 509 } 510 bp->aux_priv = aux_priv; 511 512 /* From this point, all cleanup will happen via the .release callback & 513 * any error unwinding will need to include a call to 514 * auxiliary_device_uninit. 515 */ 516 edev = kzalloc(sizeof(*edev), GFP_KERNEL); 517 if (!edev) 518 goto aux_dev_uninit; 519 520 aux_priv->edev = edev; 521 522 ulp = kzalloc(sizeof(*ulp), GFP_KERNEL); 523 if (!ulp) 524 goto aux_dev_uninit; 525 526 edev->ulp_tbl = ulp; 527 bp->edev = edev; 528 bnxt_set_edev_info(edev, bp); 529 bp->ulp_num_msix_want = bnxt_set_dflt_ulp_msix(bp); 530 531 return; 532 533 aux_dev_uninit: 534 auxiliary_device_uninit(aux_dev); 535 exit: 536 bp->flags &= ~BNXT_FLAG_ROCE_CAP; 537 } 538