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_rgtr_async_events(bp, NULL, 0); 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; 160 161 avail_msix = hw_resc->resv_irqs - bp->cp_nr_rings; 162 edev->ulp_tbl[ulp_id].msix_requested = avail_msix; 163 } 164 bnxt_fill_msix_vecs(bp, ent); 165 edev->flags |= BNXT_EN_FLAG_MSIX_REQUESTED; 166 return avail_msix; 167 } 168 169 static int bnxt_free_msix_vecs(struct bnxt_en_dev *edev, int ulp_id) 170 { 171 struct net_device *dev = edev->net; 172 struct bnxt *bp = netdev_priv(dev); 173 174 ASSERT_RTNL(); 175 if (ulp_id != BNXT_ROCE_ULP) 176 return -EINVAL; 177 178 if (!(edev->flags & BNXT_EN_FLAG_MSIX_REQUESTED)) 179 return 0; 180 181 edev->ulp_tbl[ulp_id].msix_requested = 0; 182 edev->flags &= ~BNXT_EN_FLAG_MSIX_REQUESTED; 183 if (netif_running(dev)) { 184 bnxt_close_nic(bp, true, false); 185 bnxt_open_nic(bp, true, false); 186 } 187 return 0; 188 } 189 190 int bnxt_get_ulp_msix_num(struct bnxt *bp) 191 { 192 if (bnxt_ulp_registered(bp->edev, BNXT_ROCE_ULP)) { 193 struct bnxt_en_dev *edev = bp->edev; 194 195 return edev->ulp_tbl[BNXT_ROCE_ULP].msix_requested; 196 } 197 return 0; 198 } 199 200 int bnxt_get_ulp_msix_base(struct bnxt *bp) 201 { 202 if (bnxt_ulp_registered(bp->edev, BNXT_ROCE_ULP)) { 203 struct bnxt_en_dev *edev = bp->edev; 204 205 if (edev->ulp_tbl[BNXT_ROCE_ULP].msix_requested) 206 return edev->ulp_tbl[BNXT_ROCE_ULP].msix_base; 207 } 208 return 0; 209 } 210 211 int bnxt_get_ulp_stat_ctxs(struct bnxt *bp) 212 { 213 if (bnxt_ulp_registered(bp->edev, BNXT_ROCE_ULP)) 214 return BNXT_MIN_ROCE_STAT_CTXS; 215 216 return 0; 217 } 218 219 static int bnxt_send_msg(struct bnxt_en_dev *edev, int ulp_id, 220 struct bnxt_fw_msg *fw_msg) 221 { 222 struct net_device *dev = edev->net; 223 struct bnxt *bp = netdev_priv(dev); 224 struct input *req; 225 int rc; 226 227 mutex_lock(&bp->hwrm_cmd_lock); 228 req = fw_msg->msg; 229 req->resp_addr = cpu_to_le64(bp->hwrm_cmd_resp_dma_addr); 230 rc = _hwrm_send_message(bp, fw_msg->msg, fw_msg->msg_len, 231 fw_msg->timeout); 232 if (!rc) { 233 struct output *resp = bp->hwrm_cmd_resp_addr; 234 u32 len = le16_to_cpu(resp->resp_len); 235 236 if (fw_msg->resp_max_len < len) 237 len = fw_msg->resp_max_len; 238 239 memcpy(fw_msg->resp, resp, len); 240 } 241 mutex_unlock(&bp->hwrm_cmd_lock); 242 return rc; 243 } 244 245 static void bnxt_ulp_get(struct bnxt_ulp *ulp) 246 { 247 atomic_inc(&ulp->ref_count); 248 } 249 250 static void bnxt_ulp_put(struct bnxt_ulp *ulp) 251 { 252 atomic_dec(&ulp->ref_count); 253 } 254 255 void bnxt_ulp_stop(struct bnxt *bp) 256 { 257 struct bnxt_en_dev *edev = bp->edev; 258 struct bnxt_ulp_ops *ops; 259 int i; 260 261 if (!edev) 262 return; 263 264 for (i = 0; i < BNXT_MAX_ULP; i++) { 265 struct bnxt_ulp *ulp = &edev->ulp_tbl[i]; 266 267 ops = rtnl_dereference(ulp->ulp_ops); 268 if (!ops || !ops->ulp_stop) 269 continue; 270 ops->ulp_stop(ulp->handle); 271 } 272 } 273 274 void bnxt_ulp_start(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_start) 288 continue; 289 ops->ulp_start(ulp->handle); 290 } 291 } 292 293 void bnxt_ulp_sriov_cfg(struct bnxt *bp, int num_vfs) 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 rcu_read_lock(); 306 ops = rcu_dereference(ulp->ulp_ops); 307 if (!ops || !ops->ulp_sriov_config) { 308 rcu_read_unlock(); 309 continue; 310 } 311 bnxt_ulp_get(ulp); 312 rcu_read_unlock(); 313 ops->ulp_sriov_config(ulp->handle, num_vfs); 314 bnxt_ulp_put(ulp); 315 } 316 } 317 318 void bnxt_ulp_shutdown(struct bnxt *bp) 319 { 320 struct bnxt_en_dev *edev = bp->edev; 321 struct bnxt_ulp_ops *ops; 322 int i; 323 324 if (!edev) 325 return; 326 327 for (i = 0; i < BNXT_MAX_ULP; i++) { 328 struct bnxt_ulp *ulp = &edev->ulp_tbl[i]; 329 330 ops = rtnl_dereference(ulp->ulp_ops); 331 if (!ops || !ops->ulp_shutdown) 332 continue; 333 ops->ulp_shutdown(ulp->handle); 334 } 335 } 336 337 void bnxt_ulp_irq_stop(struct bnxt *bp) 338 { 339 struct bnxt_en_dev *edev = bp->edev; 340 struct bnxt_ulp_ops *ops; 341 342 if (!edev || !(edev->flags & BNXT_EN_FLAG_MSIX_REQUESTED)) 343 return; 344 345 if (bnxt_ulp_registered(bp->edev, BNXT_ROCE_ULP)) { 346 struct bnxt_ulp *ulp = &edev->ulp_tbl[BNXT_ROCE_ULP]; 347 348 if (!ulp->msix_requested) 349 return; 350 351 ops = rtnl_dereference(ulp->ulp_ops); 352 if (!ops || !ops->ulp_irq_stop) 353 return; 354 ops->ulp_irq_stop(ulp->handle); 355 } 356 } 357 358 void bnxt_ulp_irq_restart(struct bnxt *bp, int err) 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 struct bnxt_msix_entry *ent = NULL; 369 370 if (!ulp->msix_requested) 371 return; 372 373 ops = rtnl_dereference(ulp->ulp_ops); 374 if (!ops || !ops->ulp_irq_restart) 375 return; 376 377 if (!err) { 378 ent = kcalloc(ulp->msix_requested, sizeof(*ent), 379 GFP_KERNEL); 380 if (!ent) 381 return; 382 bnxt_fill_msix_vecs(bp, ent); 383 } 384 ops->ulp_irq_restart(ulp->handle, ent); 385 kfree(ent); 386 } 387 } 388 389 void bnxt_ulp_async_events(struct bnxt *bp, struct hwrm_async_event_cmpl *cmpl) 390 { 391 u16 event_id = le16_to_cpu(cmpl->event_id); 392 struct bnxt_en_dev *edev = bp->edev; 393 struct bnxt_ulp_ops *ops; 394 int i; 395 396 if (!edev) 397 return; 398 399 rcu_read_lock(); 400 for (i = 0; i < BNXT_MAX_ULP; i++) { 401 struct bnxt_ulp *ulp = &edev->ulp_tbl[i]; 402 403 ops = rcu_dereference(ulp->ulp_ops); 404 if (!ops || !ops->ulp_async_notifier) 405 continue; 406 if (!ulp->async_events_bmap || 407 event_id > ulp->max_async_event_id) 408 continue; 409 410 /* Read max_async_event_id first before testing the bitmap. */ 411 smp_rmb(); 412 if (test_bit(event_id, ulp->async_events_bmap)) 413 ops->ulp_async_notifier(ulp->handle, cmpl); 414 } 415 rcu_read_unlock(); 416 } 417 418 static int bnxt_register_async_events(struct bnxt_en_dev *edev, int ulp_id, 419 unsigned long *events_bmap, u16 max_id) 420 { 421 struct net_device *dev = edev->net; 422 struct bnxt *bp = netdev_priv(dev); 423 struct bnxt_ulp *ulp; 424 425 if (ulp_id >= BNXT_MAX_ULP) 426 return -EINVAL; 427 428 ulp = &edev->ulp_tbl[ulp_id]; 429 ulp->async_events_bmap = events_bmap; 430 /* Make sure bnxt_ulp_async_events() sees this order */ 431 smp_wmb(); 432 ulp->max_async_event_id = max_id; 433 bnxt_hwrm_func_rgtr_async_events(bp, events_bmap, max_id + 1); 434 return 0; 435 } 436 437 static const struct bnxt_en_ops bnxt_en_ops_tbl = { 438 .bnxt_register_device = bnxt_register_dev, 439 .bnxt_unregister_device = bnxt_unregister_dev, 440 .bnxt_request_msix = bnxt_req_msix_vecs, 441 .bnxt_free_msix = bnxt_free_msix_vecs, 442 .bnxt_send_fw_msg = bnxt_send_msg, 443 .bnxt_register_fw_async_events = bnxt_register_async_events, 444 }; 445 446 struct bnxt_en_dev *bnxt_ulp_probe(struct net_device *dev) 447 { 448 struct bnxt *bp = netdev_priv(dev); 449 struct bnxt_en_dev *edev; 450 451 edev = bp->edev; 452 if (!edev) { 453 edev = kzalloc(sizeof(*edev), GFP_KERNEL); 454 if (!edev) 455 return ERR_PTR(-ENOMEM); 456 edev->en_ops = &bnxt_en_ops_tbl; 457 if (bp->flags & BNXT_FLAG_ROCEV1_CAP) 458 edev->flags |= BNXT_EN_FLAG_ROCEV1_CAP; 459 if (bp->flags & BNXT_FLAG_ROCEV2_CAP) 460 edev->flags |= BNXT_EN_FLAG_ROCEV2_CAP; 461 edev->net = dev; 462 edev->pdev = bp->pdev; 463 bp->edev = edev; 464 } 465 return bp->edev; 466 } 467