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 23 #include "bnxt_hsi.h" 24 #include "bnxt.h" 25 #include "bnxt_hwrm.h" 26 #include "bnxt_ulp.h" 27 28 static int bnxt_register_dev(struct bnxt_en_dev *edev, int ulp_id, 29 struct bnxt_ulp_ops *ulp_ops, void *handle) 30 { 31 struct net_device *dev = edev->net; 32 struct bnxt *bp = netdev_priv(dev); 33 struct bnxt_ulp *ulp; 34 35 ASSERT_RTNL(); 36 if (ulp_id >= BNXT_MAX_ULP) 37 return -EINVAL; 38 39 ulp = &edev->ulp_tbl[ulp_id]; 40 if (rcu_access_pointer(ulp->ulp_ops)) { 41 netdev_err(bp->dev, "ulp id %d already registered\n", ulp_id); 42 return -EBUSY; 43 } 44 if (ulp_id == BNXT_ROCE_ULP) { 45 unsigned int max_stat_ctxs; 46 47 max_stat_ctxs = bnxt_get_max_func_stat_ctxs(bp); 48 if (max_stat_ctxs <= BNXT_MIN_ROCE_STAT_CTXS || 49 bp->cp_nr_rings == max_stat_ctxs) 50 return -ENOMEM; 51 } 52 53 atomic_set(&ulp->ref_count, 0); 54 ulp->handle = handle; 55 rcu_assign_pointer(ulp->ulp_ops, ulp_ops); 56 57 if (ulp_id == BNXT_ROCE_ULP) { 58 if (test_bit(BNXT_STATE_OPEN, &bp->state)) 59 bnxt_hwrm_vnic_cfg(bp, 0); 60 } 61 62 return 0; 63 } 64 65 static int bnxt_unregister_dev(struct bnxt_en_dev *edev, int ulp_id) 66 { 67 struct net_device *dev = edev->net; 68 struct bnxt *bp = netdev_priv(dev); 69 struct bnxt_ulp *ulp; 70 int i = 0; 71 72 ASSERT_RTNL(); 73 if (ulp_id >= BNXT_MAX_ULP) 74 return -EINVAL; 75 76 ulp = &edev->ulp_tbl[ulp_id]; 77 if (!rcu_access_pointer(ulp->ulp_ops)) { 78 netdev_err(bp->dev, "ulp id %d not registered\n", ulp_id); 79 return -EINVAL; 80 } 81 if (ulp_id == BNXT_ROCE_ULP && ulp->msix_requested) 82 edev->en_ops->bnxt_free_msix(edev, ulp_id); 83 84 if (ulp->max_async_event_id) 85 bnxt_hwrm_func_drv_rgtr(bp, NULL, 0, true); 86 87 RCU_INIT_POINTER(ulp->ulp_ops, NULL); 88 synchronize_rcu(); 89 ulp->max_async_event_id = 0; 90 ulp->async_events_bmap = NULL; 91 while (atomic_read(&ulp->ref_count) != 0 && i < 10) { 92 msleep(100); 93 i++; 94 } 95 return 0; 96 } 97 98 static void bnxt_fill_msix_vecs(struct bnxt *bp, struct bnxt_msix_entry *ent) 99 { 100 struct bnxt_en_dev *edev = bp->edev; 101 int num_msix, idx, i; 102 103 num_msix = edev->ulp_tbl[BNXT_ROCE_ULP].msix_requested; 104 idx = edev->ulp_tbl[BNXT_ROCE_ULP].msix_base; 105 for (i = 0; i < num_msix; i++) { 106 ent[i].vector = bp->irq_tbl[idx + i].vector; 107 ent[i].ring_idx = idx + i; 108 if (bp->flags & BNXT_FLAG_CHIP_P5) { 109 ent[i].db_offset = DB_PF_OFFSET_P5; 110 if (BNXT_VF(bp)) 111 ent[i].db_offset = DB_VF_OFFSET_P5; 112 } else { 113 ent[i].db_offset = (idx + i) * 0x80; 114 } 115 } 116 } 117 118 static int bnxt_req_msix_vecs(struct bnxt_en_dev *edev, int ulp_id, 119 struct bnxt_msix_entry *ent, int num_msix) 120 { 121 struct net_device *dev = edev->net; 122 struct bnxt *bp = netdev_priv(dev); 123 struct bnxt_hw_resc *hw_resc; 124 int max_idx, max_cp_rings; 125 int avail_msix, idx; 126 int total_vecs; 127 int rc = 0; 128 129 ASSERT_RTNL(); 130 if (ulp_id != BNXT_ROCE_ULP) 131 return -EINVAL; 132 133 if (!(bp->flags & BNXT_FLAG_USING_MSIX)) 134 return -ENODEV; 135 136 if (edev->ulp_tbl[ulp_id].msix_requested) 137 return -EAGAIN; 138 139 max_cp_rings = bnxt_get_max_func_cp_rings(bp); 140 avail_msix = bnxt_get_avail_msix(bp, num_msix); 141 if (!avail_msix) 142 return -ENOMEM; 143 if (avail_msix > num_msix) 144 avail_msix = num_msix; 145 146 if (BNXT_NEW_RM(bp)) { 147 idx = bp->cp_nr_rings; 148 } else { 149 max_idx = min_t(int, bp->total_irqs, max_cp_rings); 150 idx = max_idx - avail_msix; 151 } 152 edev->ulp_tbl[ulp_id].msix_base = idx; 153 edev->ulp_tbl[ulp_id].msix_requested = avail_msix; 154 hw_resc = &bp->hw_resc; 155 total_vecs = idx + avail_msix; 156 if (bp->total_irqs < total_vecs || 157 (BNXT_NEW_RM(bp) && hw_resc->resv_irqs < total_vecs)) { 158 if (netif_running(dev)) { 159 bnxt_close_nic(bp, true, false); 160 rc = bnxt_open_nic(bp, true, false); 161 } else { 162 rc = bnxt_reserve_rings(bp, true); 163 } 164 } 165 if (rc) { 166 edev->ulp_tbl[ulp_id].msix_requested = 0; 167 return -EAGAIN; 168 } 169 170 if (BNXT_NEW_RM(bp)) { 171 int resv_msix; 172 173 resv_msix = hw_resc->resv_irqs - bp->cp_nr_rings; 174 avail_msix = min_t(int, resv_msix, avail_msix); 175 edev->ulp_tbl[ulp_id].msix_requested = avail_msix; 176 } 177 bnxt_fill_msix_vecs(bp, ent); 178 edev->flags |= BNXT_EN_FLAG_MSIX_REQUESTED; 179 return avail_msix; 180 } 181 182 static int bnxt_free_msix_vecs(struct bnxt_en_dev *edev, int ulp_id) 183 { 184 struct net_device *dev = edev->net; 185 struct bnxt *bp = netdev_priv(dev); 186 187 ASSERT_RTNL(); 188 if (ulp_id != BNXT_ROCE_ULP) 189 return -EINVAL; 190 191 if (!(edev->flags & BNXT_EN_FLAG_MSIX_REQUESTED)) 192 return 0; 193 194 edev->ulp_tbl[ulp_id].msix_requested = 0; 195 edev->flags &= ~BNXT_EN_FLAG_MSIX_REQUESTED; 196 if (netif_running(dev) && !(edev->flags & BNXT_EN_FLAG_ULP_STOPPED)) { 197 bnxt_close_nic(bp, true, false); 198 bnxt_open_nic(bp, true, false); 199 } 200 return 0; 201 } 202 203 int bnxt_get_ulp_msix_num(struct bnxt *bp) 204 { 205 if (bnxt_ulp_registered(bp->edev, BNXT_ROCE_ULP)) { 206 struct bnxt_en_dev *edev = bp->edev; 207 208 return edev->ulp_tbl[BNXT_ROCE_ULP].msix_requested; 209 } 210 return 0; 211 } 212 213 int bnxt_get_ulp_msix_base(struct bnxt *bp) 214 { 215 if (bnxt_ulp_registered(bp->edev, BNXT_ROCE_ULP)) { 216 struct bnxt_en_dev *edev = bp->edev; 217 218 if (edev->ulp_tbl[BNXT_ROCE_ULP].msix_requested) 219 return edev->ulp_tbl[BNXT_ROCE_ULP].msix_base; 220 } 221 return 0; 222 } 223 224 int bnxt_get_ulp_stat_ctxs(struct bnxt *bp) 225 { 226 if (bnxt_ulp_registered(bp->edev, BNXT_ROCE_ULP)) { 227 struct bnxt_en_dev *edev = bp->edev; 228 229 if (edev->ulp_tbl[BNXT_ROCE_ULP].msix_requested) 230 return BNXT_MIN_ROCE_STAT_CTXS; 231 } 232 233 return 0; 234 } 235 236 static int bnxt_send_msg(struct bnxt_en_dev *edev, int ulp_id, 237 struct bnxt_fw_msg *fw_msg) 238 { 239 struct net_device *dev = edev->net; 240 struct bnxt *bp = netdev_priv(dev); 241 struct output *resp; 242 struct input *req; 243 u32 resp_len; 244 int rc; 245 246 if (ulp_id != BNXT_ROCE_ULP && bp->fw_reset_state) 247 return -EBUSY; 248 249 rc = hwrm_req_init(bp, req, 0 /* don't care */); 250 if (rc) 251 return rc; 252 253 rc = hwrm_req_replace(bp, req, fw_msg->msg, fw_msg->msg_len); 254 if (rc) 255 return rc; 256 257 hwrm_req_timeout(bp, req, fw_msg->timeout); 258 resp = hwrm_req_hold(bp, req); 259 rc = hwrm_req_send(bp, req); 260 resp_len = le16_to_cpu(resp->resp_len); 261 if (resp_len) { 262 if (fw_msg->resp_max_len < resp_len) 263 resp_len = fw_msg->resp_max_len; 264 265 memcpy(fw_msg->resp, resp, resp_len); 266 } 267 hwrm_req_drop(bp, req); 268 return rc; 269 } 270 271 static void bnxt_ulp_get(struct bnxt_ulp *ulp) 272 { 273 atomic_inc(&ulp->ref_count); 274 } 275 276 static void bnxt_ulp_put(struct bnxt_ulp *ulp) 277 { 278 atomic_dec(&ulp->ref_count); 279 } 280 281 void bnxt_ulp_stop(struct bnxt *bp) 282 { 283 struct bnxt_en_dev *edev = bp->edev; 284 struct bnxt_ulp_ops *ops; 285 int i; 286 287 if (!edev) 288 return; 289 290 edev->flags |= BNXT_EN_FLAG_ULP_STOPPED; 291 for (i = 0; i < BNXT_MAX_ULP; i++) { 292 struct bnxt_ulp *ulp = &edev->ulp_tbl[i]; 293 294 ops = rtnl_dereference(ulp->ulp_ops); 295 if (!ops || !ops->ulp_stop) 296 continue; 297 ops->ulp_stop(ulp->handle); 298 } 299 } 300 301 void bnxt_ulp_start(struct bnxt *bp, int err) 302 { 303 struct bnxt_en_dev *edev = bp->edev; 304 struct bnxt_ulp_ops *ops; 305 int i; 306 307 if (!edev) 308 return; 309 310 edev->flags &= ~BNXT_EN_FLAG_ULP_STOPPED; 311 312 if (err) 313 return; 314 315 for (i = 0; i < BNXT_MAX_ULP; i++) { 316 struct bnxt_ulp *ulp = &edev->ulp_tbl[i]; 317 318 ops = rtnl_dereference(ulp->ulp_ops); 319 if (!ops || !ops->ulp_start) 320 continue; 321 ops->ulp_start(ulp->handle); 322 } 323 } 324 325 void bnxt_ulp_sriov_cfg(struct bnxt *bp, int num_vfs) 326 { 327 struct bnxt_en_dev *edev = bp->edev; 328 struct bnxt_ulp_ops *ops; 329 int i; 330 331 if (!edev) 332 return; 333 334 for (i = 0; i < BNXT_MAX_ULP; i++) { 335 struct bnxt_ulp *ulp = &edev->ulp_tbl[i]; 336 337 rcu_read_lock(); 338 ops = rcu_dereference(ulp->ulp_ops); 339 if (!ops || !ops->ulp_sriov_config) { 340 rcu_read_unlock(); 341 continue; 342 } 343 bnxt_ulp_get(ulp); 344 rcu_read_unlock(); 345 ops->ulp_sriov_config(ulp->handle, num_vfs); 346 bnxt_ulp_put(ulp); 347 } 348 } 349 350 void bnxt_ulp_shutdown(struct bnxt *bp) 351 { 352 struct bnxt_en_dev *edev = bp->edev; 353 struct bnxt_ulp_ops *ops; 354 int i; 355 356 if (!edev) 357 return; 358 359 for (i = 0; i < BNXT_MAX_ULP; i++) { 360 struct bnxt_ulp *ulp = &edev->ulp_tbl[i]; 361 362 ops = rtnl_dereference(ulp->ulp_ops); 363 if (!ops || !ops->ulp_shutdown) 364 continue; 365 ops->ulp_shutdown(ulp->handle); 366 } 367 } 368 369 void bnxt_ulp_irq_stop(struct bnxt *bp) 370 { 371 struct bnxt_en_dev *edev = bp->edev; 372 struct bnxt_ulp_ops *ops; 373 374 if (!edev || !(edev->flags & BNXT_EN_FLAG_MSIX_REQUESTED)) 375 return; 376 377 if (bnxt_ulp_registered(bp->edev, BNXT_ROCE_ULP)) { 378 struct bnxt_ulp *ulp = &edev->ulp_tbl[BNXT_ROCE_ULP]; 379 380 if (!ulp->msix_requested) 381 return; 382 383 ops = rtnl_dereference(ulp->ulp_ops); 384 if (!ops || !ops->ulp_irq_stop) 385 return; 386 ops->ulp_irq_stop(ulp->handle); 387 } 388 } 389 390 void bnxt_ulp_irq_restart(struct bnxt *bp, int err) 391 { 392 struct bnxt_en_dev *edev = bp->edev; 393 struct bnxt_ulp_ops *ops; 394 395 if (!edev || !(edev->flags & BNXT_EN_FLAG_MSIX_REQUESTED)) 396 return; 397 398 if (bnxt_ulp_registered(bp->edev, BNXT_ROCE_ULP)) { 399 struct bnxt_ulp *ulp = &edev->ulp_tbl[BNXT_ROCE_ULP]; 400 struct bnxt_msix_entry *ent = NULL; 401 402 if (!ulp->msix_requested) 403 return; 404 405 ops = rtnl_dereference(ulp->ulp_ops); 406 if (!ops || !ops->ulp_irq_restart) 407 return; 408 409 if (!err) { 410 ent = kcalloc(ulp->msix_requested, sizeof(*ent), 411 GFP_KERNEL); 412 if (!ent) 413 return; 414 bnxt_fill_msix_vecs(bp, ent); 415 } 416 ops->ulp_irq_restart(ulp->handle, ent); 417 kfree(ent); 418 } 419 } 420 421 void bnxt_ulp_async_events(struct bnxt *bp, struct hwrm_async_event_cmpl *cmpl) 422 { 423 u16 event_id = le16_to_cpu(cmpl->event_id); 424 struct bnxt_en_dev *edev = bp->edev; 425 struct bnxt_ulp_ops *ops; 426 int i; 427 428 if (!edev) 429 return; 430 431 rcu_read_lock(); 432 for (i = 0; i < BNXT_MAX_ULP; i++) { 433 struct bnxt_ulp *ulp = &edev->ulp_tbl[i]; 434 435 ops = rcu_dereference(ulp->ulp_ops); 436 if (!ops || !ops->ulp_async_notifier) 437 continue; 438 if (!ulp->async_events_bmap || 439 event_id > ulp->max_async_event_id) 440 continue; 441 442 /* Read max_async_event_id first before testing the bitmap. */ 443 smp_rmb(); 444 if (test_bit(event_id, ulp->async_events_bmap)) 445 ops->ulp_async_notifier(ulp->handle, cmpl); 446 } 447 rcu_read_unlock(); 448 } 449 450 static int bnxt_register_async_events(struct bnxt_en_dev *edev, int ulp_id, 451 unsigned long *events_bmap, u16 max_id) 452 { 453 struct net_device *dev = edev->net; 454 struct bnxt *bp = netdev_priv(dev); 455 struct bnxt_ulp *ulp; 456 457 if (ulp_id >= BNXT_MAX_ULP) 458 return -EINVAL; 459 460 ulp = &edev->ulp_tbl[ulp_id]; 461 ulp->async_events_bmap = events_bmap; 462 /* Make sure bnxt_ulp_async_events() sees this order */ 463 smp_wmb(); 464 ulp->max_async_event_id = max_id; 465 bnxt_hwrm_func_drv_rgtr(bp, events_bmap, max_id + 1, true); 466 return 0; 467 } 468 469 static const struct bnxt_en_ops bnxt_en_ops_tbl = { 470 .bnxt_register_device = bnxt_register_dev, 471 .bnxt_unregister_device = bnxt_unregister_dev, 472 .bnxt_request_msix = bnxt_req_msix_vecs, 473 .bnxt_free_msix = bnxt_free_msix_vecs, 474 .bnxt_send_fw_msg = bnxt_send_msg, 475 .bnxt_register_fw_async_events = bnxt_register_async_events, 476 }; 477 478 struct bnxt_en_dev *bnxt_ulp_probe(struct net_device *dev) 479 { 480 struct bnxt *bp = netdev_priv(dev); 481 struct bnxt_en_dev *edev; 482 483 edev = bp->edev; 484 if (!edev) { 485 edev = kzalloc(sizeof(*edev), GFP_KERNEL); 486 if (!edev) 487 return ERR_PTR(-ENOMEM); 488 edev->en_ops = &bnxt_en_ops_tbl; 489 edev->net = dev; 490 edev->pdev = bp->pdev; 491 edev->l2_db_size = bp->db_size; 492 edev->l2_db_size_nc = bp->db_size; 493 bp->edev = edev; 494 } 495 edev->flags &= ~BNXT_EN_FLAG_ROCE_CAP; 496 if (bp->flags & BNXT_FLAG_ROCEV1_CAP) 497 edev->flags |= BNXT_EN_FLAG_ROCEV1_CAP; 498 if (bp->flags & BNXT_FLAG_ROCEV2_CAP) 499 edev->flags |= BNXT_EN_FLAG_ROCEV2_CAP; 500 return bp->edev; 501 } 502 EXPORT_SYMBOL(bnxt_ulp_probe); 503