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