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 ent[i].db_offset = (idx + i) * 0x80; 108 } 109 } 110 111 static int bnxt_req_msix_vecs(struct bnxt_en_dev *edev, int ulp_id, 112 struct bnxt_msix_entry *ent, int num_msix) 113 { 114 struct net_device *dev = edev->net; 115 struct bnxt *bp = netdev_priv(dev); 116 int max_idx, max_cp_rings; 117 int avail_msix, idx; 118 int rc = 0; 119 120 ASSERT_RTNL(); 121 if (ulp_id != BNXT_ROCE_ULP) 122 return -EINVAL; 123 124 if (!(bp->flags & BNXT_FLAG_USING_MSIX)) 125 return -ENODEV; 126 127 if (edev->ulp_tbl[ulp_id].msix_requested) 128 return -EAGAIN; 129 130 max_cp_rings = bnxt_get_max_func_cp_rings(bp); 131 avail_msix = bnxt_get_avail_msix(bp, num_msix); 132 if (!avail_msix) 133 return -ENOMEM; 134 if (avail_msix > num_msix) 135 avail_msix = num_msix; 136 137 if (BNXT_NEW_RM(bp)) { 138 idx = bp->cp_nr_rings; 139 } else { 140 max_idx = min_t(int, bp->total_irqs, max_cp_rings); 141 idx = max_idx - avail_msix; 142 } 143 edev->ulp_tbl[ulp_id].msix_base = idx; 144 edev->ulp_tbl[ulp_id].msix_requested = avail_msix; 145 if (bp->total_irqs < (idx + avail_msix)) { 146 if (netif_running(dev)) { 147 bnxt_close_nic(bp, true, false); 148 rc = bnxt_open_nic(bp, true, false); 149 } else { 150 rc = bnxt_reserve_rings(bp, true); 151 } 152 } 153 if (rc) { 154 edev->ulp_tbl[ulp_id].msix_requested = 0; 155 return -EAGAIN; 156 } 157 158 if (BNXT_NEW_RM(bp)) { 159 struct bnxt_hw_resc *hw_resc = &bp->hw_resc; 160 int resv_msix; 161 162 resv_msix = hw_resc->resv_irqs - bp->cp_nr_rings; 163 avail_msix = min_t(int, resv_msix, avail_msix); 164 edev->ulp_tbl[ulp_id].msix_requested = avail_msix; 165 } 166 bnxt_fill_msix_vecs(bp, ent); 167 edev->flags |= BNXT_EN_FLAG_MSIX_REQUESTED; 168 return avail_msix; 169 } 170 171 static int bnxt_free_msix_vecs(struct bnxt_en_dev *edev, int ulp_id) 172 { 173 struct net_device *dev = edev->net; 174 struct bnxt *bp = netdev_priv(dev); 175 176 ASSERT_RTNL(); 177 if (ulp_id != BNXT_ROCE_ULP) 178 return -EINVAL; 179 180 if (!(edev->flags & BNXT_EN_FLAG_MSIX_REQUESTED)) 181 return 0; 182 183 edev->ulp_tbl[ulp_id].msix_requested = 0; 184 edev->flags &= ~BNXT_EN_FLAG_MSIX_REQUESTED; 185 if (netif_running(dev) && !(edev->flags & BNXT_EN_FLAG_ULP_STOPPED)) { 186 bnxt_close_nic(bp, true, false); 187 bnxt_open_nic(bp, true, false); 188 } 189 return 0; 190 } 191 192 int bnxt_get_ulp_msix_num(struct bnxt *bp) 193 { 194 if (bnxt_ulp_registered(bp->edev, BNXT_ROCE_ULP)) { 195 struct bnxt_en_dev *edev = bp->edev; 196 197 return edev->ulp_tbl[BNXT_ROCE_ULP].msix_requested; 198 } 199 return 0; 200 } 201 202 int bnxt_get_ulp_msix_base(struct bnxt *bp) 203 { 204 if (bnxt_ulp_registered(bp->edev, BNXT_ROCE_ULP)) { 205 struct bnxt_en_dev *edev = bp->edev; 206 207 if (edev->ulp_tbl[BNXT_ROCE_ULP].msix_requested) 208 return edev->ulp_tbl[BNXT_ROCE_ULP].msix_base; 209 } 210 return 0; 211 } 212 213 int bnxt_get_ulp_stat_ctxs(struct bnxt *bp) 214 { 215 if (bnxt_ulp_registered(bp->edev, BNXT_ROCE_ULP)) 216 return BNXT_MIN_ROCE_STAT_CTXS; 217 218 return 0; 219 } 220 221 static int bnxt_send_msg(struct bnxt_en_dev *edev, int ulp_id, 222 struct bnxt_fw_msg *fw_msg) 223 { 224 struct net_device *dev = edev->net; 225 struct bnxt *bp = netdev_priv(dev); 226 struct input *req; 227 int rc; 228 229 if (ulp_id != BNXT_ROCE_ULP && bp->fw_reset_state) 230 return -EBUSY; 231 232 mutex_lock(&bp->hwrm_cmd_lock); 233 req = fw_msg->msg; 234 req->resp_addr = cpu_to_le64(bp->hwrm_cmd_resp_dma_addr); 235 rc = _hwrm_send_message(bp, fw_msg->msg, fw_msg->msg_len, 236 fw_msg->timeout); 237 if (!rc) { 238 struct output *resp = bp->hwrm_cmd_resp_addr; 239 u32 len = le16_to_cpu(resp->resp_len); 240 241 if (fw_msg->resp_max_len < len) 242 len = fw_msg->resp_max_len; 243 244 memcpy(fw_msg->resp, resp, len); 245 } 246 mutex_unlock(&bp->hwrm_cmd_lock); 247 return rc; 248 } 249 250 static void bnxt_ulp_get(struct bnxt_ulp *ulp) 251 { 252 atomic_inc(&ulp->ref_count); 253 } 254 255 static void bnxt_ulp_put(struct bnxt_ulp *ulp) 256 { 257 atomic_dec(&ulp->ref_count); 258 } 259 260 void bnxt_ulp_stop(struct bnxt *bp) 261 { 262 struct bnxt_en_dev *edev = bp->edev; 263 struct bnxt_ulp_ops *ops; 264 int i; 265 266 if (!edev) 267 return; 268 269 edev->flags |= BNXT_EN_FLAG_ULP_STOPPED; 270 for (i = 0; i < BNXT_MAX_ULP; i++) { 271 struct bnxt_ulp *ulp = &edev->ulp_tbl[i]; 272 273 ops = rtnl_dereference(ulp->ulp_ops); 274 if (!ops || !ops->ulp_stop) 275 continue; 276 ops->ulp_stop(ulp->handle); 277 } 278 } 279 280 void bnxt_ulp_start(struct bnxt *bp, int err) 281 { 282 struct bnxt_en_dev *edev = bp->edev; 283 struct bnxt_ulp_ops *ops; 284 int i; 285 286 if (!edev) 287 return; 288 289 edev->flags &= ~BNXT_EN_FLAG_ULP_STOPPED; 290 291 if (err) 292 return; 293 294 for (i = 0; i < BNXT_MAX_ULP; i++) { 295 struct bnxt_ulp *ulp = &edev->ulp_tbl[i]; 296 297 ops = rtnl_dereference(ulp->ulp_ops); 298 if (!ops || !ops->ulp_start) 299 continue; 300 ops->ulp_start(ulp->handle); 301 } 302 } 303 304 void bnxt_ulp_sriov_cfg(struct bnxt *bp, int num_vfs) 305 { 306 struct bnxt_en_dev *edev = bp->edev; 307 struct bnxt_ulp_ops *ops; 308 int i; 309 310 if (!edev) 311 return; 312 313 for (i = 0; i < BNXT_MAX_ULP; i++) { 314 struct bnxt_ulp *ulp = &edev->ulp_tbl[i]; 315 316 rcu_read_lock(); 317 ops = rcu_dereference(ulp->ulp_ops); 318 if (!ops || !ops->ulp_sriov_config) { 319 rcu_read_unlock(); 320 continue; 321 } 322 bnxt_ulp_get(ulp); 323 rcu_read_unlock(); 324 ops->ulp_sriov_config(ulp->handle, num_vfs); 325 bnxt_ulp_put(ulp); 326 } 327 } 328 329 void bnxt_ulp_shutdown(struct bnxt *bp) 330 { 331 struct bnxt_en_dev *edev = bp->edev; 332 struct bnxt_ulp_ops *ops; 333 int i; 334 335 if (!edev) 336 return; 337 338 for (i = 0; i < BNXT_MAX_ULP; i++) { 339 struct bnxt_ulp *ulp = &edev->ulp_tbl[i]; 340 341 ops = rtnl_dereference(ulp->ulp_ops); 342 if (!ops || !ops->ulp_shutdown) 343 continue; 344 ops->ulp_shutdown(ulp->handle); 345 } 346 } 347 348 void bnxt_ulp_irq_stop(struct bnxt *bp) 349 { 350 struct bnxt_en_dev *edev = bp->edev; 351 struct bnxt_ulp_ops *ops; 352 353 if (!edev || !(edev->flags & BNXT_EN_FLAG_MSIX_REQUESTED)) 354 return; 355 356 if (bnxt_ulp_registered(bp->edev, BNXT_ROCE_ULP)) { 357 struct bnxt_ulp *ulp = &edev->ulp_tbl[BNXT_ROCE_ULP]; 358 359 if (!ulp->msix_requested) 360 return; 361 362 ops = rtnl_dereference(ulp->ulp_ops); 363 if (!ops || !ops->ulp_irq_stop) 364 return; 365 ops->ulp_irq_stop(ulp->handle); 366 } 367 } 368 369 void bnxt_ulp_irq_restart(struct bnxt *bp, int err) 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 struct bnxt_msix_entry *ent = NULL; 380 381 if (!ulp->msix_requested) 382 return; 383 384 ops = rtnl_dereference(ulp->ulp_ops); 385 if (!ops || !ops->ulp_irq_restart) 386 return; 387 388 if (!err) { 389 ent = kcalloc(ulp->msix_requested, sizeof(*ent), 390 GFP_KERNEL); 391 if (!ent) 392 return; 393 bnxt_fill_msix_vecs(bp, ent); 394 } 395 ops->ulp_irq_restart(ulp->handle, ent); 396 kfree(ent); 397 } 398 } 399 400 void bnxt_ulp_async_events(struct bnxt *bp, struct hwrm_async_event_cmpl *cmpl) 401 { 402 u16 event_id = le16_to_cpu(cmpl->event_id); 403 struct bnxt_en_dev *edev = bp->edev; 404 struct bnxt_ulp_ops *ops; 405 int i; 406 407 if (!edev) 408 return; 409 410 rcu_read_lock(); 411 for (i = 0; i < BNXT_MAX_ULP; i++) { 412 struct bnxt_ulp *ulp = &edev->ulp_tbl[i]; 413 414 ops = rcu_dereference(ulp->ulp_ops); 415 if (!ops || !ops->ulp_async_notifier) 416 continue; 417 if (!ulp->async_events_bmap || 418 event_id > ulp->max_async_event_id) 419 continue; 420 421 /* Read max_async_event_id first before testing the bitmap. */ 422 smp_rmb(); 423 if (test_bit(event_id, ulp->async_events_bmap)) 424 ops->ulp_async_notifier(ulp->handle, cmpl); 425 } 426 rcu_read_unlock(); 427 } 428 429 static int bnxt_register_async_events(struct bnxt_en_dev *edev, int ulp_id, 430 unsigned long *events_bmap, u16 max_id) 431 { 432 struct net_device *dev = edev->net; 433 struct bnxt *bp = netdev_priv(dev); 434 struct bnxt_ulp *ulp; 435 436 if (ulp_id >= BNXT_MAX_ULP) 437 return -EINVAL; 438 439 ulp = &edev->ulp_tbl[ulp_id]; 440 ulp->async_events_bmap = events_bmap; 441 /* Make sure bnxt_ulp_async_events() sees this order */ 442 smp_wmb(); 443 ulp->max_async_event_id = max_id; 444 bnxt_hwrm_func_drv_rgtr(bp, events_bmap, max_id + 1, true); 445 return 0; 446 } 447 448 static const struct bnxt_en_ops bnxt_en_ops_tbl = { 449 .bnxt_register_device = bnxt_register_dev, 450 .bnxt_unregister_device = bnxt_unregister_dev, 451 .bnxt_request_msix = bnxt_req_msix_vecs, 452 .bnxt_free_msix = bnxt_free_msix_vecs, 453 .bnxt_send_fw_msg = bnxt_send_msg, 454 .bnxt_register_fw_async_events = bnxt_register_async_events, 455 }; 456 457 struct bnxt_en_dev *bnxt_ulp_probe(struct net_device *dev) 458 { 459 struct bnxt *bp = netdev_priv(dev); 460 struct bnxt_en_dev *edev; 461 462 edev = bp->edev; 463 if (!edev) { 464 edev = kzalloc(sizeof(*edev), GFP_KERNEL); 465 if (!edev) 466 return ERR_PTR(-ENOMEM); 467 edev->en_ops = &bnxt_en_ops_tbl; 468 if (bp->flags & BNXT_FLAG_ROCEV1_CAP) 469 edev->flags |= BNXT_EN_FLAG_ROCEV1_CAP; 470 if (bp->flags & BNXT_FLAG_ROCEV2_CAP) 471 edev->flags |= BNXT_EN_FLAG_ROCEV2_CAP; 472 edev->net = dev; 473 edev->pdev = bp->pdev; 474 bp->edev = edev; 475 } 476 return bp->edev; 477 } 478