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 rtnl_lock(); 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 rtnl_unlock(); 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 int i = 0; 152 153 ulp = edev->ulp_tbl; 154 rtnl_lock(); 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 while (atomic_read(&ulp->ref_count) != 0 && i < 10) { 168 msleep(100); 169 i++; 170 } 171 mutex_unlock(&edev->en_dev_lock); 172 rtnl_unlock(); 173 return; 174 } 175 EXPORT_SYMBOL(bnxt_unregister_dev); 176 177 static int bnxt_set_dflt_ulp_msix(struct bnxt *bp) 178 { 179 int roce_msix = BNXT_MAX_ROCE_MSIX; 180 181 if (BNXT_VF(bp)) 182 roce_msix = BNXT_MAX_ROCE_MSIX_VF; 183 else if (bp->port_partition_type) 184 roce_msix = BNXT_MAX_ROCE_MSIX_NPAR_PF; 185 186 /* NQ MSIX vectors should match the number of CPUs plus 1 more for 187 * the CREQ MSIX, up to the default. 188 */ 189 return min_t(int, roce_msix, num_online_cpus() + 1); 190 } 191 192 int bnxt_send_msg(struct bnxt_en_dev *edev, 193 struct bnxt_fw_msg *fw_msg) 194 { 195 struct net_device *dev = edev->net; 196 struct bnxt *bp = netdev_priv(dev); 197 struct output *resp; 198 struct input *req; 199 u32 resp_len; 200 int rc; 201 202 if (bp->fw_reset_state) 203 return -EBUSY; 204 205 rc = hwrm_req_init(bp, req, 0 /* don't care */); 206 if (rc) 207 return rc; 208 209 rc = hwrm_req_replace(bp, req, fw_msg->msg, fw_msg->msg_len); 210 if (rc) 211 return rc; 212 213 hwrm_req_timeout(bp, req, fw_msg->timeout); 214 resp = hwrm_req_hold(bp, req); 215 rc = hwrm_req_send(bp, req); 216 resp_len = le16_to_cpu(resp->resp_len); 217 if (resp_len) { 218 if (fw_msg->resp_max_len < resp_len) 219 resp_len = fw_msg->resp_max_len; 220 221 memcpy(fw_msg->resp, resp, resp_len); 222 } 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 mutex_unlock(&edev->en_dev_lock); 239 return; 240 } 241 242 edev->flags |= BNXT_EN_FLAG_ULP_STOPPED; 243 if (aux_priv) { 244 struct auxiliary_device *adev; 245 246 adev = &aux_priv->aux_dev; 247 if (adev->dev.driver) { 248 const struct auxiliary_driver *adrv; 249 pm_message_t pm = {}; 250 251 adrv = to_auxiliary_drv(adev->dev.driver); 252 edev->en_state = bp->state; 253 adrv->suspend(adev, pm); 254 } 255 } 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) 265 return; 266 267 edev->flags &= ~BNXT_EN_FLAG_ULP_STOPPED; 268 269 if (err) 270 return; 271 272 mutex_lock(&edev->en_dev_lock); 273 if (!bnxt_ulp_registered(edev)) { 274 mutex_unlock(&edev->en_dev_lock); 275 return; 276 } 277 278 if (edev->ulp_tbl->msix_requested) 279 bnxt_fill_msix_vecs(bp, edev->msix_entries); 280 281 if (aux_priv) { 282 struct auxiliary_device *adev; 283 284 adev = &aux_priv->aux_dev; 285 if (adev->dev.driver) { 286 const struct auxiliary_driver *adrv; 287 288 adrv = to_auxiliary_drv(adev->dev.driver); 289 edev->en_state = bp->state; 290 adrv->resume(adev); 291 } 292 } 293 mutex_unlock(&edev->en_dev_lock); 294 } 295 296 void bnxt_ulp_irq_stop(struct bnxt *bp) 297 { 298 struct bnxt_en_dev *edev = bp->edev; 299 struct bnxt_ulp_ops *ops; 300 301 if (!edev || !(edev->flags & BNXT_EN_FLAG_MSIX_REQUESTED)) 302 return; 303 304 if (bnxt_ulp_registered(bp->edev)) { 305 struct bnxt_ulp *ulp = edev->ulp_tbl; 306 307 if (!ulp->msix_requested) 308 return; 309 310 ops = rtnl_dereference(ulp->ulp_ops); 311 if (!ops || !ops->ulp_irq_stop) 312 return; 313 ops->ulp_irq_stop(ulp->handle); 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 = rtnl_dereference(ulp->ulp_ops); 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 int bnxt_register_async_events(struct bnxt_en_dev *edev, 349 unsigned long *events_bmap, 350 u16 max_id) 351 { 352 struct net_device *dev = edev->net; 353 struct bnxt *bp = netdev_priv(dev); 354 struct bnxt_ulp *ulp; 355 356 ulp = edev->ulp_tbl; 357 ulp->async_events_bmap = events_bmap; 358 /* Make sure bnxt_ulp_async_events() sees this order */ 359 smp_wmb(); 360 ulp->max_async_event_id = max_id; 361 bnxt_hwrm_func_drv_rgtr(bp, events_bmap, max_id + 1, true); 362 return 0; 363 } 364 EXPORT_SYMBOL(bnxt_register_async_events); 365 366 void bnxt_rdma_aux_device_uninit(struct bnxt *bp) 367 { 368 struct bnxt_aux_priv *aux_priv; 369 struct auxiliary_device *adev; 370 371 /* Skip if no auxiliary device init was done. */ 372 if (!bp->aux_priv) 373 return; 374 375 aux_priv = bp->aux_priv; 376 adev = &aux_priv->aux_dev; 377 auxiliary_device_uninit(adev); 378 } 379 380 static void bnxt_aux_dev_release(struct device *dev) 381 { 382 struct bnxt_aux_priv *aux_priv = 383 container_of(dev, struct bnxt_aux_priv, aux_dev.dev); 384 struct bnxt *bp = netdev_priv(aux_priv->edev->net); 385 386 ida_free(&bnxt_aux_dev_ids, aux_priv->id); 387 kfree(aux_priv->edev->ulp_tbl); 388 bp->edev = NULL; 389 kfree(aux_priv->edev); 390 kfree(aux_priv); 391 bp->aux_priv = NULL; 392 } 393 394 void bnxt_rdma_aux_device_del(struct bnxt *bp) 395 { 396 if (!bp->edev) 397 return; 398 399 auxiliary_device_delete(&bp->aux_priv->aux_dev); 400 } 401 402 static void bnxt_set_edev_info(struct bnxt_en_dev *edev, struct bnxt *bp) 403 { 404 edev->net = bp->dev; 405 edev->pdev = bp->pdev; 406 edev->l2_db_size = bp->db_size; 407 edev->l2_db_size_nc = bp->db_size; 408 edev->l2_db_offset = bp->db_offset; 409 mutex_init(&edev->en_dev_lock); 410 411 if (bp->flags & BNXT_FLAG_ROCEV1_CAP) 412 edev->flags |= BNXT_EN_FLAG_ROCEV1_CAP; 413 if (bp->flags & BNXT_FLAG_ROCEV2_CAP) 414 edev->flags |= BNXT_EN_FLAG_ROCEV2_CAP; 415 if (bp->flags & BNXT_FLAG_VF) 416 edev->flags |= BNXT_EN_FLAG_VF; 417 418 edev->chip_num = bp->chip_num; 419 edev->hw_ring_stats_size = bp->hw_ring_stats_size; 420 edev->pf_port_id = bp->pf.port_id; 421 edev->en_state = bp->state; 422 edev->bar0 = bp->bar0; 423 } 424 425 void bnxt_rdma_aux_device_add(struct bnxt *bp) 426 { 427 struct auxiliary_device *aux_dev; 428 int rc; 429 430 if (!bp->edev) 431 return; 432 433 aux_dev = &bp->aux_priv->aux_dev; 434 rc = auxiliary_device_add(aux_dev); 435 if (rc) { 436 netdev_warn(bp->dev, "Failed to add auxiliary device for ROCE\n"); 437 auxiliary_device_uninit(aux_dev); 438 bp->flags &= ~BNXT_FLAG_ROCE_CAP; 439 } 440 } 441 442 void bnxt_rdma_aux_device_init(struct bnxt *bp) 443 { 444 struct auxiliary_device *aux_dev; 445 struct bnxt_aux_priv *aux_priv; 446 struct bnxt_en_dev *edev; 447 struct bnxt_ulp *ulp; 448 int rc; 449 450 if (!(bp->flags & BNXT_FLAG_ROCE_CAP)) 451 return; 452 453 aux_priv = kzalloc(sizeof(*bp->aux_priv), GFP_KERNEL); 454 if (!aux_priv) 455 goto exit; 456 457 aux_priv->id = ida_alloc(&bnxt_aux_dev_ids, GFP_KERNEL); 458 if (aux_priv->id < 0) { 459 netdev_warn(bp->dev, 460 "ida alloc failed for ROCE auxiliary device\n"); 461 kfree(aux_priv); 462 goto exit; 463 } 464 465 aux_dev = &aux_priv->aux_dev; 466 aux_dev->id = aux_priv->id; 467 aux_dev->name = "rdma"; 468 aux_dev->dev.parent = &bp->pdev->dev; 469 aux_dev->dev.release = bnxt_aux_dev_release; 470 471 rc = auxiliary_device_init(aux_dev); 472 if (rc) { 473 ida_free(&bnxt_aux_dev_ids, aux_priv->id); 474 kfree(aux_priv); 475 goto exit; 476 } 477 bp->aux_priv = aux_priv; 478 479 /* From this point, all cleanup will happen via the .release callback & 480 * any error unwinding will need to include a call to 481 * auxiliary_device_uninit. 482 */ 483 edev = kzalloc(sizeof(*edev), GFP_KERNEL); 484 if (!edev) 485 goto aux_dev_uninit; 486 487 aux_priv->edev = edev; 488 489 ulp = kzalloc(sizeof(*ulp), GFP_KERNEL); 490 if (!ulp) 491 goto aux_dev_uninit; 492 493 edev->ulp_tbl = ulp; 494 bp->edev = edev; 495 bnxt_set_edev_info(edev, bp); 496 bp->ulp_num_msix_want = bnxt_set_dflt_ulp_msix(bp); 497 498 return; 499 500 aux_dev_uninit: 501 auxiliary_device_uninit(aux_dev); 502 exit: 503 bp->flags &= ~BNXT_FLAG_ROCE_CAP; 504 } 505