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_ulp.h" 26 27 static int bnxt_register_dev(struct bnxt_en_dev *edev, int ulp_id, 28 struct bnxt_ulp_ops *ulp_ops, void *handle) 29 { 30 struct net_device *dev = edev->net; 31 struct bnxt *bp = netdev_priv(dev); 32 struct bnxt_ulp *ulp; 33 34 ASSERT_RTNL(); 35 if (ulp_id >= BNXT_MAX_ULP) 36 return -EINVAL; 37 38 ulp = &edev->ulp_tbl[ulp_id]; 39 if (rcu_access_pointer(ulp->ulp_ops)) { 40 netdev_err(bp->dev, "ulp id %d already registered\n", ulp_id); 41 return -EBUSY; 42 } 43 if (ulp_id == BNXT_ROCE_ULP) { 44 unsigned int max_stat_ctxs; 45 46 max_stat_ctxs = bnxt_get_max_func_stat_ctxs(bp); 47 if (max_stat_ctxs <= BNXT_MIN_ROCE_STAT_CTXS || 48 bp->cp_nr_rings == max_stat_ctxs) 49 return -ENOMEM; 50 } 51 52 atomic_set(&ulp->ref_count, 0); 53 ulp->handle = handle; 54 rcu_assign_pointer(ulp->ulp_ops, ulp_ops); 55 56 if (ulp_id == BNXT_ROCE_ULP) { 57 if (test_bit(BNXT_STATE_OPEN, &bp->state)) 58 bnxt_hwrm_vnic_cfg(bp, 0); 59 } 60 61 return 0; 62 } 63 64 static int bnxt_unregister_dev(struct bnxt_en_dev *edev, int ulp_id) 65 { 66 struct net_device *dev = edev->net; 67 struct bnxt *bp = netdev_priv(dev); 68 struct bnxt_ulp *ulp; 69 int i = 0; 70 71 ASSERT_RTNL(); 72 if (ulp_id >= BNXT_MAX_ULP) 73 return -EINVAL; 74 75 ulp = &edev->ulp_tbl[ulp_id]; 76 if (!rcu_access_pointer(ulp->ulp_ops)) { 77 netdev_err(bp->dev, "ulp id %d not registered\n", ulp_id); 78 return -EINVAL; 79 } 80 if (ulp_id == BNXT_ROCE_ULP && ulp->msix_requested) 81 edev->en_ops->bnxt_free_msix(edev, ulp_id); 82 83 if (ulp->max_async_event_id) 84 bnxt_hwrm_func_drv_rgtr(bp, NULL, 0, true); 85 86 RCU_INIT_POINTER(ulp->ulp_ops, NULL); 87 synchronize_rcu(); 88 ulp->max_async_event_id = 0; 89 ulp->async_events_bmap = NULL; 90 while (atomic_read(&ulp->ref_count) != 0 && i < 10) { 91 msleep(100); 92 i++; 93 } 94 return 0; 95 } 96 97 static void bnxt_fill_msix_vecs(struct bnxt *bp, struct bnxt_msix_entry *ent) 98 { 99 struct bnxt_en_dev *edev = bp->edev; 100 int num_msix, idx, i; 101 102 num_msix = edev->ulp_tbl[BNXT_ROCE_ULP].msix_requested; 103 idx = edev->ulp_tbl[BNXT_ROCE_ULP].msix_base; 104 for (i = 0; i < num_msix; i++) { 105 ent[i].vector = bp->irq_tbl[idx + i].vector; 106 ent[i].ring_idx = idx + i; 107 if (bp->flags & BNXT_FLAG_CHIP_P5) { 108 ent[i].db_offset = DB_PF_OFFSET_P5; 109 if (BNXT_VF(bp)) 110 ent[i].db_offset = DB_VF_OFFSET_P5; 111 } else { 112 ent[i].db_offset = (idx + i) * 0x80; 113 } 114 } 115 } 116 117 static int bnxt_req_msix_vecs(struct bnxt_en_dev *edev, int ulp_id, 118 struct bnxt_msix_entry *ent, int num_msix) 119 { 120 struct net_device *dev = edev->net; 121 struct bnxt *bp = netdev_priv(dev); 122 struct bnxt_hw_resc *hw_resc; 123 int max_idx, max_cp_rings; 124 int avail_msix, idx; 125 int total_vecs; 126 int rc = 0; 127 128 ASSERT_RTNL(); 129 if (ulp_id != BNXT_ROCE_ULP) 130 return -EINVAL; 131 132 if (!(bp->flags & BNXT_FLAG_USING_MSIX)) 133 return -ENODEV; 134 135 if (edev->ulp_tbl[ulp_id].msix_requested) 136 return -EAGAIN; 137 138 max_cp_rings = bnxt_get_max_func_cp_rings(bp); 139 avail_msix = bnxt_get_avail_msix(bp, num_msix); 140 if (!avail_msix) 141 return -ENOMEM; 142 if (avail_msix > num_msix) 143 avail_msix = num_msix; 144 145 if (BNXT_NEW_RM(bp)) { 146 idx = bp->cp_nr_rings; 147 } else { 148 max_idx = min_t(int, bp->total_irqs, max_cp_rings); 149 idx = max_idx - avail_msix; 150 } 151 edev->ulp_tbl[ulp_id].msix_base = idx; 152 edev->ulp_tbl[ulp_id].msix_requested = avail_msix; 153 hw_resc = &bp->hw_resc; 154 total_vecs = idx + avail_msix; 155 if (bp->total_irqs < total_vecs || 156 (BNXT_NEW_RM(bp) && hw_resc->resv_irqs < total_vecs)) { 157 if (netif_running(dev)) { 158 bnxt_close_nic(bp, true, false); 159 rc = bnxt_open_nic(bp, true, false); 160 } else { 161 rc = bnxt_reserve_rings(bp, true); 162 } 163 } 164 if (rc) { 165 edev->ulp_tbl[ulp_id].msix_requested = 0; 166 return -EAGAIN; 167 } 168 169 if (BNXT_NEW_RM(bp)) { 170 int resv_msix; 171 172 resv_msix = hw_resc->resv_irqs - bp->cp_nr_rings; 173 avail_msix = min_t(int, resv_msix, avail_msix); 174 edev->ulp_tbl[ulp_id].msix_requested = avail_msix; 175 } 176 bnxt_fill_msix_vecs(bp, ent); 177 edev->flags |= BNXT_EN_FLAG_MSIX_REQUESTED; 178 return avail_msix; 179 } 180 181 static int bnxt_free_msix_vecs(struct bnxt_en_dev *edev, int ulp_id) 182 { 183 struct net_device *dev = edev->net; 184 struct bnxt *bp = netdev_priv(dev); 185 186 ASSERT_RTNL(); 187 if (ulp_id != BNXT_ROCE_ULP) 188 return -EINVAL; 189 190 if (!(edev->flags & BNXT_EN_FLAG_MSIX_REQUESTED)) 191 return 0; 192 193 edev->ulp_tbl[ulp_id].msix_requested = 0; 194 edev->flags &= ~BNXT_EN_FLAG_MSIX_REQUESTED; 195 if (netif_running(dev) && !(edev->flags & BNXT_EN_FLAG_ULP_STOPPED)) { 196 bnxt_close_nic(bp, true, false); 197 bnxt_open_nic(bp, true, false); 198 } 199 return 0; 200 } 201 202 int bnxt_get_ulp_msix_num(struct bnxt *bp) 203 { 204 if (bnxt_ulp_registered(bp->edev, BNXT_ROCE_ULP)) { 205 struct bnxt_en_dev *edev = bp->edev; 206 207 return edev->ulp_tbl[BNXT_ROCE_ULP].msix_requested; 208 } 209 return 0; 210 } 211 212 int bnxt_get_ulp_msix_base(struct bnxt *bp) 213 { 214 if (bnxt_ulp_registered(bp->edev, BNXT_ROCE_ULP)) { 215 struct bnxt_en_dev *edev = bp->edev; 216 217 if (edev->ulp_tbl[BNXT_ROCE_ULP].msix_requested) 218 return edev->ulp_tbl[BNXT_ROCE_ULP].msix_base; 219 } 220 return 0; 221 } 222 223 int bnxt_get_ulp_stat_ctxs(struct bnxt *bp) 224 { 225 if (bnxt_ulp_registered(bp->edev, BNXT_ROCE_ULP)) 226 return BNXT_MIN_ROCE_STAT_CTXS; 227 228 return 0; 229 } 230 231 static int bnxt_send_msg(struct bnxt_en_dev *edev, int ulp_id, 232 struct bnxt_fw_msg *fw_msg) 233 { 234 struct net_device *dev = edev->net; 235 struct bnxt *bp = netdev_priv(dev); 236 struct input *req; 237 int rc; 238 239 if (ulp_id != BNXT_ROCE_ULP && bp->fw_reset_state) 240 return -EBUSY; 241 242 mutex_lock(&bp->hwrm_cmd_lock); 243 req = fw_msg->msg; 244 req->resp_addr = cpu_to_le64(bp->hwrm_cmd_resp_dma_addr); 245 rc = _hwrm_send_message(bp, fw_msg->msg, fw_msg->msg_len, 246 fw_msg->timeout); 247 if (!rc) { 248 struct output *resp = bp->hwrm_cmd_resp_addr; 249 u32 len = le16_to_cpu(resp->resp_len); 250 251 if (fw_msg->resp_max_len < len) 252 len = fw_msg->resp_max_len; 253 254 memcpy(fw_msg->resp, resp, len); 255 } 256 mutex_unlock(&bp->hwrm_cmd_lock); 257 return rc; 258 } 259 260 static void bnxt_ulp_get(struct bnxt_ulp *ulp) 261 { 262 atomic_inc(&ulp->ref_count); 263 } 264 265 static void bnxt_ulp_put(struct bnxt_ulp *ulp) 266 { 267 atomic_dec(&ulp->ref_count); 268 } 269 270 void bnxt_ulp_stop(struct bnxt *bp) 271 { 272 struct bnxt_en_dev *edev = bp->edev; 273 struct bnxt_ulp_ops *ops; 274 int i; 275 276 if (!edev) 277 return; 278 279 edev->flags |= BNXT_EN_FLAG_ULP_STOPPED; 280 for (i = 0; i < BNXT_MAX_ULP; i++) { 281 struct bnxt_ulp *ulp = &edev->ulp_tbl[i]; 282 283 ops = rtnl_dereference(ulp->ulp_ops); 284 if (!ops || !ops->ulp_stop) 285 continue; 286 ops->ulp_stop(ulp->handle); 287 } 288 } 289 290 void bnxt_ulp_start(struct bnxt *bp, int err) 291 { 292 struct bnxt_en_dev *edev = bp->edev; 293 struct bnxt_ulp_ops *ops; 294 int i; 295 296 if (!edev) 297 return; 298 299 edev->flags &= ~BNXT_EN_FLAG_ULP_STOPPED; 300 301 if (err) 302 return; 303 304 for (i = 0; i < BNXT_MAX_ULP; i++) { 305 struct bnxt_ulp *ulp = &edev->ulp_tbl[i]; 306 307 ops = rtnl_dereference(ulp->ulp_ops); 308 if (!ops || !ops->ulp_start) 309 continue; 310 ops->ulp_start(ulp->handle); 311 } 312 } 313 314 void bnxt_ulp_sriov_cfg(struct bnxt *bp, int num_vfs) 315 { 316 struct bnxt_en_dev *edev = bp->edev; 317 struct bnxt_ulp_ops *ops; 318 int i; 319 320 if (!edev) 321 return; 322 323 for (i = 0; i < BNXT_MAX_ULP; i++) { 324 struct bnxt_ulp *ulp = &edev->ulp_tbl[i]; 325 326 rcu_read_lock(); 327 ops = rcu_dereference(ulp->ulp_ops); 328 if (!ops || !ops->ulp_sriov_config) { 329 rcu_read_unlock(); 330 continue; 331 } 332 bnxt_ulp_get(ulp); 333 rcu_read_unlock(); 334 ops->ulp_sriov_config(ulp->handle, num_vfs); 335 bnxt_ulp_put(ulp); 336 } 337 } 338 339 void bnxt_ulp_shutdown(struct bnxt *bp) 340 { 341 struct bnxt_en_dev *edev = bp->edev; 342 struct bnxt_ulp_ops *ops; 343 int i; 344 345 if (!edev) 346 return; 347 348 for (i = 0; i < BNXT_MAX_ULP; i++) { 349 struct bnxt_ulp *ulp = &edev->ulp_tbl[i]; 350 351 ops = rtnl_dereference(ulp->ulp_ops); 352 if (!ops || !ops->ulp_shutdown) 353 continue; 354 ops->ulp_shutdown(ulp->handle); 355 } 356 } 357 358 void bnxt_ulp_irq_stop(struct bnxt *bp) 359 { 360 struct bnxt_en_dev *edev = bp->edev; 361 struct bnxt_ulp_ops *ops; 362 363 if (!edev || !(edev->flags & BNXT_EN_FLAG_MSIX_REQUESTED)) 364 return; 365 366 if (bnxt_ulp_registered(bp->edev, BNXT_ROCE_ULP)) { 367 struct bnxt_ulp *ulp = &edev->ulp_tbl[BNXT_ROCE_ULP]; 368 369 if (!ulp->msix_requested) 370 return; 371 372 ops = rtnl_dereference(ulp->ulp_ops); 373 if (!ops || !ops->ulp_irq_stop) 374 return; 375 ops->ulp_irq_stop(ulp->handle); 376 } 377 } 378 379 void bnxt_ulp_irq_restart(struct bnxt *bp, int err) 380 { 381 struct bnxt_en_dev *edev = bp->edev; 382 struct bnxt_ulp_ops *ops; 383 384 if (!edev || !(edev->flags & BNXT_EN_FLAG_MSIX_REQUESTED)) 385 return; 386 387 if (bnxt_ulp_registered(bp->edev, BNXT_ROCE_ULP)) { 388 struct bnxt_ulp *ulp = &edev->ulp_tbl[BNXT_ROCE_ULP]; 389 struct bnxt_msix_entry *ent = NULL; 390 391 if (!ulp->msix_requested) 392 return; 393 394 ops = rtnl_dereference(ulp->ulp_ops); 395 if (!ops || !ops->ulp_irq_restart) 396 return; 397 398 if (!err) { 399 ent = kcalloc(ulp->msix_requested, sizeof(*ent), 400 GFP_KERNEL); 401 if (!ent) 402 return; 403 bnxt_fill_msix_vecs(bp, ent); 404 } 405 ops->ulp_irq_restart(ulp->handle, ent); 406 kfree(ent); 407 } 408 } 409 410 void bnxt_ulp_async_events(struct bnxt *bp, struct hwrm_async_event_cmpl *cmpl) 411 { 412 u16 event_id = le16_to_cpu(cmpl->event_id); 413 struct bnxt_en_dev *edev = bp->edev; 414 struct bnxt_ulp_ops *ops; 415 int i; 416 417 if (!edev) 418 return; 419 420 rcu_read_lock(); 421 for (i = 0; i < BNXT_MAX_ULP; i++) { 422 struct bnxt_ulp *ulp = &edev->ulp_tbl[i]; 423 424 ops = rcu_dereference(ulp->ulp_ops); 425 if (!ops || !ops->ulp_async_notifier) 426 continue; 427 if (!ulp->async_events_bmap || 428 event_id > ulp->max_async_event_id) 429 continue; 430 431 /* Read max_async_event_id first before testing the bitmap. */ 432 smp_rmb(); 433 if (test_bit(event_id, ulp->async_events_bmap)) 434 ops->ulp_async_notifier(ulp->handle, cmpl); 435 } 436 rcu_read_unlock(); 437 } 438 439 static int bnxt_register_async_events(struct bnxt_en_dev *edev, int ulp_id, 440 unsigned long *events_bmap, u16 max_id) 441 { 442 struct net_device *dev = edev->net; 443 struct bnxt *bp = netdev_priv(dev); 444 struct bnxt_ulp *ulp; 445 446 if (ulp_id >= BNXT_MAX_ULP) 447 return -EINVAL; 448 449 ulp = &edev->ulp_tbl[ulp_id]; 450 ulp->async_events_bmap = events_bmap; 451 /* Make sure bnxt_ulp_async_events() sees this order */ 452 smp_wmb(); 453 ulp->max_async_event_id = max_id; 454 bnxt_hwrm_func_drv_rgtr(bp, events_bmap, max_id + 1, true); 455 return 0; 456 } 457 458 static const struct bnxt_en_ops bnxt_en_ops_tbl = { 459 .bnxt_register_device = bnxt_register_dev, 460 .bnxt_unregister_device = bnxt_unregister_dev, 461 .bnxt_request_msix = bnxt_req_msix_vecs, 462 .bnxt_free_msix = bnxt_free_msix_vecs, 463 .bnxt_send_fw_msg = bnxt_send_msg, 464 .bnxt_register_fw_async_events = bnxt_register_async_events, 465 }; 466 467 struct bnxt_en_dev *bnxt_ulp_probe(struct net_device *dev) 468 { 469 struct bnxt *bp = netdev_priv(dev); 470 struct bnxt_en_dev *edev; 471 472 edev = bp->edev; 473 if (!edev) { 474 edev = kzalloc(sizeof(*edev), GFP_KERNEL); 475 if (!edev) 476 return ERR_PTR(-ENOMEM); 477 edev->en_ops = &bnxt_en_ops_tbl; 478 if (bp->flags & BNXT_FLAG_ROCEV1_CAP) 479 edev->flags |= BNXT_EN_FLAG_ROCEV1_CAP; 480 if (bp->flags & BNXT_FLAG_ROCEV2_CAP) 481 edev->flags |= BNXT_EN_FLAG_ROCEV2_CAP; 482 edev->net = dev; 483 edev->pdev = bp->pdev; 484 edev->l2_db_size = bp->db_size; 485 edev->l2_db_size_nc = bp->db_size; 486 bp->edev = edev; 487 } 488 return bp->edev; 489 } 490