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 edev->flags |= BNXT_EN_FLAG_MSIX_REQUESTED; 173 return avail_msix; 174 } 175 176 static int bnxt_free_msix_vecs(struct bnxt_en_dev *edev, int ulp_id) 177 { 178 struct net_device *dev = edev->net; 179 struct bnxt *bp = netdev_priv(dev); 180 181 ASSERT_RTNL(); 182 if (ulp_id != BNXT_ROCE_ULP) 183 return -EINVAL; 184 185 if (!(edev->flags & BNXT_EN_FLAG_MSIX_REQUESTED)) 186 return 0; 187 188 edev->ulp_tbl[ulp_id].msix_requested = 0; 189 edev->flags &= ~BNXT_EN_FLAG_MSIX_REQUESTED; 190 if (netif_running(dev)) { 191 bnxt_close_nic(bp, true, false); 192 bnxt_open_nic(bp, true, false); 193 } 194 return 0; 195 } 196 197 int bnxt_get_ulp_msix_num(struct bnxt *bp) 198 { 199 if (bnxt_ulp_registered(bp->edev, BNXT_ROCE_ULP)) { 200 struct bnxt_en_dev *edev = bp->edev; 201 202 return edev->ulp_tbl[BNXT_ROCE_ULP].msix_requested; 203 } 204 return 0; 205 } 206 207 int bnxt_get_ulp_msix_base(struct bnxt *bp) 208 { 209 if (bnxt_ulp_registered(bp->edev, BNXT_ROCE_ULP)) { 210 struct bnxt_en_dev *edev = bp->edev; 211 212 if (edev->ulp_tbl[BNXT_ROCE_ULP].msix_requested) 213 return edev->ulp_tbl[BNXT_ROCE_ULP].msix_base; 214 } 215 return 0; 216 } 217 218 static int bnxt_send_msg(struct bnxt_en_dev *edev, int ulp_id, 219 struct bnxt_fw_msg *fw_msg) 220 { 221 struct net_device *dev = edev->net; 222 struct bnxt *bp = netdev_priv(dev); 223 struct input *req; 224 int rc; 225 226 mutex_lock(&bp->hwrm_cmd_lock); 227 req = fw_msg->msg; 228 req->resp_addr = cpu_to_le64(bp->hwrm_cmd_resp_dma_addr); 229 rc = _hwrm_send_message(bp, fw_msg->msg, fw_msg->msg_len, 230 fw_msg->timeout); 231 if (!rc) { 232 struct output *resp = bp->hwrm_cmd_resp_addr; 233 u32 len = le16_to_cpu(resp->resp_len); 234 235 if (fw_msg->resp_max_len < len) 236 len = fw_msg->resp_max_len; 237 238 memcpy(fw_msg->resp, resp, len); 239 } 240 mutex_unlock(&bp->hwrm_cmd_lock); 241 return rc; 242 } 243 244 static void bnxt_ulp_get(struct bnxt_ulp *ulp) 245 { 246 atomic_inc(&ulp->ref_count); 247 } 248 249 static void bnxt_ulp_put(struct bnxt_ulp *ulp) 250 { 251 atomic_dec(&ulp->ref_count); 252 } 253 254 void bnxt_ulp_stop(struct bnxt *bp) 255 { 256 struct bnxt_en_dev *edev = bp->edev; 257 struct bnxt_ulp_ops *ops; 258 int i; 259 260 if (!edev) 261 return; 262 263 for (i = 0; i < BNXT_MAX_ULP; i++) { 264 struct bnxt_ulp *ulp = &edev->ulp_tbl[i]; 265 266 ops = rtnl_dereference(ulp->ulp_ops); 267 if (!ops || !ops->ulp_stop) 268 continue; 269 ops->ulp_stop(ulp->handle); 270 } 271 } 272 273 void bnxt_ulp_start(struct bnxt *bp) 274 { 275 struct bnxt_en_dev *edev = bp->edev; 276 struct bnxt_ulp_ops *ops; 277 int i; 278 279 if (!edev) 280 return; 281 282 for (i = 0; i < BNXT_MAX_ULP; i++) { 283 struct bnxt_ulp *ulp = &edev->ulp_tbl[i]; 284 285 ops = rtnl_dereference(ulp->ulp_ops); 286 if (!ops || !ops->ulp_start) 287 continue; 288 ops->ulp_start(ulp->handle); 289 } 290 } 291 292 void bnxt_ulp_sriov_cfg(struct bnxt *bp, int num_vfs) 293 { 294 struct bnxt_en_dev *edev = bp->edev; 295 struct bnxt_ulp_ops *ops; 296 int i; 297 298 if (!edev) 299 return; 300 301 for (i = 0; i < BNXT_MAX_ULP; i++) { 302 struct bnxt_ulp *ulp = &edev->ulp_tbl[i]; 303 304 rcu_read_lock(); 305 ops = rcu_dereference(ulp->ulp_ops); 306 if (!ops || !ops->ulp_sriov_config) { 307 rcu_read_unlock(); 308 continue; 309 } 310 bnxt_ulp_get(ulp); 311 rcu_read_unlock(); 312 ops->ulp_sriov_config(ulp->handle, num_vfs); 313 bnxt_ulp_put(ulp); 314 } 315 } 316 317 void bnxt_ulp_shutdown(struct bnxt *bp) 318 { 319 struct bnxt_en_dev *edev = bp->edev; 320 struct bnxt_ulp_ops *ops; 321 int i; 322 323 if (!edev) 324 return; 325 326 for (i = 0; i < BNXT_MAX_ULP; i++) { 327 struct bnxt_ulp *ulp = &edev->ulp_tbl[i]; 328 329 ops = rtnl_dereference(ulp->ulp_ops); 330 if (!ops || !ops->ulp_shutdown) 331 continue; 332 ops->ulp_shutdown(ulp->handle); 333 } 334 } 335 336 void bnxt_ulp_irq_stop(struct bnxt *bp) 337 { 338 struct bnxt_en_dev *edev = bp->edev; 339 struct bnxt_ulp_ops *ops; 340 341 if (!edev || !(edev->flags & BNXT_EN_FLAG_MSIX_REQUESTED)) 342 return; 343 344 if (bnxt_ulp_registered(bp->edev, BNXT_ROCE_ULP)) { 345 struct bnxt_ulp *ulp = &edev->ulp_tbl[BNXT_ROCE_ULP]; 346 347 if (!ulp->msix_requested) 348 return; 349 350 ops = rtnl_dereference(ulp->ulp_ops); 351 if (!ops || !ops->ulp_irq_stop) 352 return; 353 ops->ulp_irq_stop(ulp->handle); 354 } 355 } 356 357 void bnxt_ulp_irq_restart(struct bnxt *bp, int err) 358 { 359 struct bnxt_en_dev *edev = bp->edev; 360 struct bnxt_ulp_ops *ops; 361 362 if (!edev || !(edev->flags & BNXT_EN_FLAG_MSIX_REQUESTED)) 363 return; 364 365 if (bnxt_ulp_registered(bp->edev, BNXT_ROCE_ULP)) { 366 struct bnxt_ulp *ulp = &edev->ulp_tbl[BNXT_ROCE_ULP]; 367 struct bnxt_msix_entry *ent = NULL; 368 369 if (!ulp->msix_requested) 370 return; 371 372 ops = rtnl_dereference(ulp->ulp_ops); 373 if (!ops || !ops->ulp_irq_restart) 374 return; 375 376 if (!err) { 377 ent = kcalloc(ulp->msix_requested, sizeof(*ent), 378 GFP_KERNEL); 379 if (!ent) 380 return; 381 bnxt_fill_msix_vecs(bp, ent); 382 } 383 ops->ulp_irq_restart(ulp->handle, ent); 384 kfree(ent); 385 } 386 } 387 388 void bnxt_ulp_async_events(struct bnxt *bp, struct hwrm_async_event_cmpl *cmpl) 389 { 390 u16 event_id = le16_to_cpu(cmpl->event_id); 391 struct bnxt_en_dev *edev = bp->edev; 392 struct bnxt_ulp_ops *ops; 393 int i; 394 395 if (!edev) 396 return; 397 398 rcu_read_lock(); 399 for (i = 0; i < BNXT_MAX_ULP; i++) { 400 struct bnxt_ulp *ulp = &edev->ulp_tbl[i]; 401 402 ops = rcu_dereference(ulp->ulp_ops); 403 if (!ops || !ops->ulp_async_notifier) 404 continue; 405 if (!ulp->async_events_bmap || 406 event_id > ulp->max_async_event_id) 407 continue; 408 409 /* Read max_async_event_id first before testing the bitmap. */ 410 smp_rmb(); 411 if (test_bit(event_id, ulp->async_events_bmap)) 412 ops->ulp_async_notifier(ulp->handle, cmpl); 413 } 414 rcu_read_unlock(); 415 } 416 417 static int bnxt_register_async_events(struct bnxt_en_dev *edev, int ulp_id, 418 unsigned long *events_bmap, u16 max_id) 419 { 420 struct net_device *dev = edev->net; 421 struct bnxt *bp = netdev_priv(dev); 422 struct bnxt_ulp *ulp; 423 424 if (ulp_id >= BNXT_MAX_ULP) 425 return -EINVAL; 426 427 ulp = &edev->ulp_tbl[ulp_id]; 428 ulp->async_events_bmap = events_bmap; 429 /* Make sure bnxt_ulp_async_events() sees this order */ 430 smp_wmb(); 431 ulp->max_async_event_id = max_id; 432 bnxt_hwrm_func_rgtr_async_events(bp, events_bmap, max_id + 1); 433 return 0; 434 } 435 436 static const struct bnxt_en_ops bnxt_en_ops_tbl = { 437 .bnxt_register_device = bnxt_register_dev, 438 .bnxt_unregister_device = bnxt_unregister_dev, 439 .bnxt_request_msix = bnxt_req_msix_vecs, 440 .bnxt_free_msix = bnxt_free_msix_vecs, 441 .bnxt_send_fw_msg = bnxt_send_msg, 442 .bnxt_register_fw_async_events = bnxt_register_async_events, 443 }; 444 445 struct bnxt_en_dev *bnxt_ulp_probe(struct net_device *dev) 446 { 447 struct bnxt *bp = netdev_priv(dev); 448 struct bnxt_en_dev *edev; 449 450 edev = bp->edev; 451 if (!edev) { 452 edev = kzalloc(sizeof(*edev), GFP_KERNEL); 453 if (!edev) 454 return ERR_PTR(-ENOMEM); 455 edev->en_ops = &bnxt_en_ops_tbl; 456 if (bp->flags & BNXT_FLAG_ROCEV1_CAP) 457 edev->flags |= BNXT_EN_FLAG_ROCEV1_CAP; 458 if (bp->flags & BNXT_FLAG_ROCEV2_CAP) 459 edev->flags |= BNXT_EN_FLAG_ROCEV2_CAP; 460 edev->net = dev; 461 edev->pdev = bp->pdev; 462 bp->edev = edev; 463 } 464 return bp->edev; 465 } 466