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 25 #include "bnxt_hsi.h" 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 } 105 106 int bnxt_register_dev(struct bnxt_en_dev *edev, 107 struct bnxt_ulp_ops *ulp_ops, 108 void *handle) 109 { 110 struct net_device *dev = edev->net; 111 struct bnxt *bp = netdev_priv(dev); 112 unsigned int max_stat_ctxs; 113 struct bnxt_ulp *ulp; 114 int rc = 0; 115 116 netdev_lock(dev); 117 mutex_lock(&edev->en_dev_lock); 118 if (!bp->irq_tbl) { 119 rc = -ENODEV; 120 goto exit; 121 } 122 max_stat_ctxs = bnxt_get_max_func_stat_ctxs(bp); 123 if (max_stat_ctxs <= BNXT_MIN_ROCE_STAT_CTXS || 124 bp->cp_nr_rings == max_stat_ctxs) { 125 rc = -ENOMEM; 126 goto exit; 127 } 128 129 ulp = edev->ulp_tbl; 130 ulp->handle = handle; 131 rcu_assign_pointer(ulp->ulp_ops, ulp_ops); 132 133 if (test_bit(BNXT_STATE_OPEN, &bp->state)) 134 bnxt_hwrm_vnic_cfg(bp, &bp->vnic_info[BNXT_VNIC_DEFAULT]); 135 136 edev->ulp_tbl->msix_requested = bnxt_get_ulp_msix_num(bp); 137 138 bnxt_fill_msix_vecs(bp, bp->edev->msix_entries); 139 edev->flags |= BNXT_EN_FLAG_MSIX_REQUESTED; 140 exit: 141 mutex_unlock(&edev->en_dev_lock); 142 netdev_unlock(dev); 143 return rc; 144 } 145 EXPORT_SYMBOL(bnxt_register_dev); 146 147 void bnxt_unregister_dev(struct bnxt_en_dev *edev) 148 { 149 struct net_device *dev = edev->net; 150 struct bnxt *bp = netdev_priv(dev); 151 struct bnxt_ulp *ulp; 152 153 ulp = edev->ulp_tbl; 154 netdev_lock(dev); 155 mutex_lock(&edev->en_dev_lock); 156 if (ulp->msix_requested) 157 edev->flags &= ~BNXT_EN_FLAG_MSIX_REQUESTED; 158 edev->ulp_tbl->msix_requested = 0; 159 160 if (ulp->max_async_event_id) 161 bnxt_hwrm_func_drv_rgtr(bp, NULL, 0, true); 162 163 RCU_INIT_POINTER(ulp->ulp_ops, NULL); 164 synchronize_rcu(); 165 ulp->max_async_event_id = 0; 166 ulp->async_events_bmap = NULL; 167 mutex_unlock(&edev->en_dev_lock); 168 netdev_unlock(dev); 169 return; 170 } 171 EXPORT_SYMBOL(bnxt_unregister_dev); 172 173 static int bnxt_set_dflt_ulp_msix(struct bnxt *bp) 174 { 175 int roce_msix = BNXT_MAX_ROCE_MSIX; 176 177 if (BNXT_VF(bp)) 178 roce_msix = BNXT_MAX_ROCE_MSIX_VF; 179 else if (bp->port_partition_type) 180 roce_msix = BNXT_MAX_ROCE_MSIX_NPAR_PF; 181 182 /* NQ MSIX vectors should match the number of CPUs plus 1 more for 183 * the CREQ MSIX, up to the default. 184 */ 185 return min_t(int, roce_msix, num_online_cpus() + 1); 186 } 187 188 int bnxt_send_msg(struct bnxt_en_dev *edev, 189 struct bnxt_fw_msg *fw_msg) 190 { 191 struct net_device *dev = edev->net; 192 struct bnxt *bp = netdev_priv(dev); 193 struct output *resp; 194 struct input *req; 195 u32 resp_len; 196 int rc; 197 198 if (bp->fw_reset_state) 199 return -EBUSY; 200 201 rc = hwrm_req_init(bp, req, 0 /* don't care */); 202 if (rc) 203 return rc; 204 205 rc = hwrm_req_replace(bp, req, fw_msg->msg, fw_msg->msg_len); 206 if (rc) 207 goto drop_req; 208 209 hwrm_req_timeout(bp, req, fw_msg->timeout); 210 resp = hwrm_req_hold(bp, req); 211 rc = hwrm_req_send(bp, req); 212 resp_len = le16_to_cpu(resp->resp_len); 213 if (resp_len) { 214 if (fw_msg->resp_max_len < resp_len) 215 resp_len = fw_msg->resp_max_len; 216 217 memcpy(fw_msg->resp, resp, resp_len); 218 } 219 drop_req: 220 hwrm_req_drop(bp, req); 221 return rc; 222 } 223 EXPORT_SYMBOL(bnxt_send_msg); 224 225 void bnxt_ulp_stop(struct bnxt *bp) 226 { 227 struct bnxt_aux_priv *aux_priv = bp->aux_priv; 228 struct bnxt_en_dev *edev = bp->edev; 229 230 if (!edev) 231 return; 232 233 mutex_lock(&edev->en_dev_lock); 234 if (!bnxt_ulp_registered(edev)) { 235 mutex_unlock(&edev->en_dev_lock); 236 return; 237 } 238 239 edev->flags |= BNXT_EN_FLAG_ULP_STOPPED; 240 if (aux_priv) { 241 struct auxiliary_device *adev; 242 243 adev = &aux_priv->aux_dev; 244 if (adev->dev.driver) { 245 const struct auxiliary_driver *adrv; 246 pm_message_t pm = {}; 247 248 adrv = to_auxiliary_drv(adev->dev.driver); 249 edev->en_state = bp->state; 250 adrv->suspend(adev, pm); 251 } 252 } 253 mutex_unlock(&edev->en_dev_lock); 254 } 255 256 void bnxt_ulp_start(struct bnxt *bp, int err) 257 { 258 struct bnxt_aux_priv *aux_priv = bp->aux_priv; 259 struct bnxt_en_dev *edev = bp->edev; 260 261 if (!edev) 262 return; 263 264 edev->flags &= ~BNXT_EN_FLAG_ULP_STOPPED; 265 266 if (err) 267 return; 268 269 mutex_lock(&edev->en_dev_lock); 270 if (!bnxt_ulp_registered(edev)) { 271 mutex_unlock(&edev->en_dev_lock); 272 return; 273 } 274 275 if (edev->ulp_tbl->msix_requested) 276 bnxt_fill_msix_vecs(bp, edev->msix_entries); 277 278 if (aux_priv) { 279 struct auxiliary_device *adev; 280 281 adev = &aux_priv->aux_dev; 282 if (adev->dev.driver) { 283 const struct auxiliary_driver *adrv; 284 285 adrv = to_auxiliary_drv(adev->dev.driver); 286 edev->en_state = bp->state; 287 adrv->resume(adev); 288 } 289 } 290 mutex_unlock(&edev->en_dev_lock); 291 } 292 293 void bnxt_ulp_irq_stop(struct bnxt *bp) 294 { 295 struct bnxt_en_dev *edev = bp->edev; 296 struct bnxt_ulp_ops *ops; 297 bool reset = false; 298 299 if (!edev || !(edev->flags & BNXT_EN_FLAG_MSIX_REQUESTED)) 300 return; 301 302 if (bnxt_ulp_registered(bp->edev)) { 303 struct bnxt_ulp *ulp = edev->ulp_tbl; 304 305 if (!ulp->msix_requested) 306 return; 307 308 ops = netdev_lock_dereference(ulp->ulp_ops, bp->dev); 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 } 315 } 316 317 void bnxt_ulp_irq_restart(struct bnxt *bp, int err) 318 { 319 struct bnxt_en_dev *edev = bp->edev; 320 struct bnxt_ulp_ops *ops; 321 322 if (!edev || !(edev->flags & BNXT_EN_FLAG_MSIX_REQUESTED)) 323 return; 324 325 if (bnxt_ulp_registered(bp->edev)) { 326 struct bnxt_ulp *ulp = edev->ulp_tbl; 327 struct bnxt_msix_entry *ent = NULL; 328 329 if (!ulp->msix_requested) 330 return; 331 332 ops = netdev_lock_dereference(ulp->ulp_ops, bp->dev); 333 if (!ops || !ops->ulp_irq_restart) 334 return; 335 336 if (!err) { 337 ent = kcalloc(ulp->msix_requested, sizeof(*ent), 338 GFP_KERNEL); 339 if (!ent) 340 return; 341 bnxt_fill_msix_vecs(bp, ent); 342 } 343 ops->ulp_irq_restart(ulp->handle, ent); 344 kfree(ent); 345 } 346 } 347 348 void bnxt_ulp_async_events(struct bnxt *bp, struct hwrm_async_event_cmpl *cmpl) 349 { 350 u16 event_id = le16_to_cpu(cmpl->event_id); 351 struct bnxt_en_dev *edev = bp->edev; 352 struct bnxt_ulp_ops *ops; 353 struct bnxt_ulp *ulp; 354 355 if (!bnxt_ulp_registered(edev)) 356 return; 357 ulp = edev->ulp_tbl; 358 359 rcu_read_lock(); 360 361 ops = rcu_dereference(ulp->ulp_ops); 362 if (!ops || !ops->ulp_async_notifier) 363 goto exit_unlock_rcu; 364 if (!ulp->async_events_bmap || event_id > ulp->max_async_event_id) 365 goto exit_unlock_rcu; 366 367 /* Read max_async_event_id first before testing the bitmap. */ 368 smp_rmb(); 369 370 if (test_bit(event_id, ulp->async_events_bmap)) 371 ops->ulp_async_notifier(ulp->handle, cmpl); 372 exit_unlock_rcu: 373 rcu_read_unlock(); 374 } 375 376 void bnxt_register_async_events(struct bnxt_en_dev *edev, 377 unsigned long *events_bmap, u16 max_id) 378 { 379 struct net_device *dev = edev->net; 380 struct bnxt *bp = netdev_priv(dev); 381 struct bnxt_ulp *ulp; 382 383 ulp = edev->ulp_tbl; 384 ulp->async_events_bmap = events_bmap; 385 /* Make sure bnxt_ulp_async_events() sees this order */ 386 smp_wmb(); 387 ulp->max_async_event_id = max_id; 388 bnxt_hwrm_func_drv_rgtr(bp, events_bmap, max_id + 1, true); 389 } 390 EXPORT_SYMBOL(bnxt_register_async_events); 391 392 void bnxt_rdma_aux_device_uninit(struct bnxt *bp) 393 { 394 struct bnxt_aux_priv *aux_priv; 395 struct auxiliary_device *adev; 396 397 /* Skip if no auxiliary device init was done. */ 398 if (!bp->aux_priv) 399 return; 400 401 aux_priv = bp->aux_priv; 402 adev = &aux_priv->aux_dev; 403 auxiliary_device_uninit(adev); 404 } 405 406 static void bnxt_aux_dev_release(struct device *dev) 407 { 408 struct bnxt_aux_priv *aux_priv = 409 container_of(dev, struct bnxt_aux_priv, aux_dev.dev); 410 struct bnxt *bp = netdev_priv(aux_priv->edev->net); 411 412 ida_free(&bnxt_aux_dev_ids, aux_priv->id); 413 kfree(aux_priv->edev->ulp_tbl); 414 bp->edev = NULL; 415 kfree(aux_priv->edev); 416 kfree(aux_priv); 417 bp->aux_priv = NULL; 418 } 419 420 void bnxt_rdma_aux_device_del(struct bnxt *bp) 421 { 422 if (!bp->edev) 423 return; 424 425 auxiliary_device_delete(&bp->aux_priv->aux_dev); 426 } 427 428 static void bnxt_set_edev_info(struct bnxt_en_dev *edev, struct bnxt *bp) 429 { 430 edev->net = bp->dev; 431 edev->pdev = bp->pdev; 432 edev->l2_db_size = bp->db_size; 433 edev->l2_db_size_nc = bp->db_size; 434 edev->l2_db_offset = bp->db_offset; 435 mutex_init(&edev->en_dev_lock); 436 437 if (bp->flags & BNXT_FLAG_ROCEV1_CAP) 438 edev->flags |= BNXT_EN_FLAG_ROCEV1_CAP; 439 if (bp->flags & BNXT_FLAG_ROCEV2_CAP) 440 edev->flags |= BNXT_EN_FLAG_ROCEV2_CAP; 441 if (bp->flags & BNXT_FLAG_VF) 442 edev->flags |= BNXT_EN_FLAG_VF; 443 if (BNXT_ROCE_VF_RESC_CAP(bp)) 444 edev->flags |= BNXT_EN_FLAG_ROCE_VF_RES_MGMT; 445 if (BNXT_SW_RES_LMT(bp)) 446 edev->flags |= BNXT_EN_FLAG_SW_RES_LMT; 447 448 edev->chip_num = bp->chip_num; 449 edev->hw_ring_stats_size = bp->hw_ring_stats_size; 450 edev->pf_port_id = bp->pf.port_id; 451 edev->en_state = bp->state; 452 edev->bar0 = bp->bar0; 453 } 454 455 void bnxt_rdma_aux_device_add(struct bnxt *bp) 456 { 457 struct auxiliary_device *aux_dev; 458 int rc; 459 460 if (!bp->edev) 461 return; 462 463 aux_dev = &bp->aux_priv->aux_dev; 464 rc = auxiliary_device_add(aux_dev); 465 if (rc) { 466 netdev_warn(bp->dev, "Failed to add auxiliary device for ROCE\n"); 467 auxiliary_device_uninit(aux_dev); 468 bp->flags &= ~BNXT_FLAG_ROCE_CAP; 469 } 470 } 471 472 void bnxt_rdma_aux_device_init(struct bnxt *bp) 473 { 474 struct auxiliary_device *aux_dev; 475 struct bnxt_aux_priv *aux_priv; 476 struct bnxt_en_dev *edev; 477 struct bnxt_ulp *ulp; 478 int rc; 479 480 if (!(bp->flags & BNXT_FLAG_ROCE_CAP)) 481 return; 482 483 aux_priv = kzalloc(sizeof(*bp->aux_priv), GFP_KERNEL); 484 if (!aux_priv) 485 goto exit; 486 487 aux_priv->id = ida_alloc(&bnxt_aux_dev_ids, GFP_KERNEL); 488 if (aux_priv->id < 0) { 489 netdev_warn(bp->dev, 490 "ida alloc failed for ROCE auxiliary device\n"); 491 kfree(aux_priv); 492 goto exit; 493 } 494 495 aux_dev = &aux_priv->aux_dev; 496 aux_dev->id = aux_priv->id; 497 aux_dev->name = "rdma"; 498 aux_dev->dev.parent = &bp->pdev->dev; 499 aux_dev->dev.release = bnxt_aux_dev_release; 500 501 rc = auxiliary_device_init(aux_dev); 502 if (rc) { 503 ida_free(&bnxt_aux_dev_ids, aux_priv->id); 504 kfree(aux_priv); 505 goto exit; 506 } 507 bp->aux_priv = aux_priv; 508 509 /* From this point, all cleanup will happen via the .release callback & 510 * any error unwinding will need to include a call to 511 * auxiliary_device_uninit. 512 */ 513 edev = kzalloc(sizeof(*edev), GFP_KERNEL); 514 if (!edev) 515 goto aux_dev_uninit; 516 517 aux_priv->edev = edev; 518 519 ulp = kzalloc(sizeof(*ulp), GFP_KERNEL); 520 if (!ulp) 521 goto aux_dev_uninit; 522 523 edev->ulp_tbl = ulp; 524 bp->edev = edev; 525 bnxt_set_edev_info(edev, bp); 526 bp->ulp_num_msix_want = bnxt_set_dflt_ulp_msix(bp); 527 528 return; 529 530 aux_dev_uninit: 531 auxiliary_device_uninit(aux_dev); 532 exit: 533 bp->flags &= ~BNXT_FLAG_ROCE_CAP; 534 } 535