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 #include <linux/auxiliary_bus.h> 23 24 #include "bnxt_hsi.h" 25 #include "bnxt.h" 26 #include "bnxt_hwrm.h" 27 #include "bnxt_ulp.h" 28 29 static DEFINE_IDA(bnxt_aux_dev_ids); 30 31 static void bnxt_fill_msix_vecs(struct bnxt *bp, struct bnxt_msix_entry *ent) 32 { 33 struct bnxt_en_dev *edev = bp->edev; 34 int num_msix, idx, i; 35 36 if (!edev->ulp_tbl->msix_requested) { 37 netdev_warn(bp->dev, "Requested MSI-X vectors insufficient\n"); 38 return; 39 } 40 num_msix = edev->ulp_tbl->msix_requested; 41 idx = edev->ulp_tbl->msix_base; 42 for (i = 0; i < num_msix; i++) { 43 ent[i].vector = bp->irq_tbl[idx + i].vector; 44 ent[i].ring_idx = idx + i; 45 if (bp->flags & BNXT_FLAG_CHIP_P5) { 46 ent[i].db_offset = DB_PF_OFFSET_P5; 47 if (BNXT_VF(bp)) 48 ent[i].db_offset = DB_VF_OFFSET_P5; 49 } else { 50 ent[i].db_offset = (idx + i) * 0x80; 51 } 52 } 53 } 54 55 int bnxt_register_dev(struct bnxt_en_dev *edev, 56 struct bnxt_ulp_ops *ulp_ops, 57 void *handle) 58 { 59 struct net_device *dev = edev->net; 60 struct bnxt *bp = netdev_priv(dev); 61 unsigned int max_stat_ctxs; 62 struct bnxt_ulp *ulp; 63 64 max_stat_ctxs = bnxt_get_max_func_stat_ctxs(bp); 65 if (max_stat_ctxs <= BNXT_MIN_ROCE_STAT_CTXS || 66 bp->cp_nr_rings == max_stat_ctxs) 67 return -ENOMEM; 68 69 ulp = edev->ulp_tbl; 70 if (!ulp) 71 return -ENOMEM; 72 73 ulp->handle = handle; 74 rcu_assign_pointer(ulp->ulp_ops, ulp_ops); 75 76 if (test_bit(BNXT_STATE_OPEN, &bp->state)) 77 bnxt_hwrm_vnic_cfg(bp, 0); 78 79 bnxt_fill_msix_vecs(bp, bp->edev->msix_entries); 80 edev->flags |= BNXT_EN_FLAG_MSIX_REQUESTED; 81 return 0; 82 } 83 EXPORT_SYMBOL(bnxt_register_dev); 84 85 void bnxt_unregister_dev(struct bnxt_en_dev *edev) 86 { 87 struct net_device *dev = edev->net; 88 struct bnxt *bp = netdev_priv(dev); 89 struct bnxt_ulp *ulp; 90 int i = 0; 91 92 ulp = edev->ulp_tbl; 93 if (ulp->msix_requested) 94 edev->flags &= ~BNXT_EN_FLAG_MSIX_REQUESTED; 95 96 if (ulp->max_async_event_id) 97 bnxt_hwrm_func_drv_rgtr(bp, NULL, 0, true); 98 99 RCU_INIT_POINTER(ulp->ulp_ops, NULL); 100 synchronize_rcu(); 101 ulp->max_async_event_id = 0; 102 ulp->async_events_bmap = NULL; 103 while (atomic_read(&ulp->ref_count) != 0 && i < 10) { 104 msleep(100); 105 i++; 106 } 107 return; 108 } 109 EXPORT_SYMBOL(bnxt_unregister_dev); 110 111 int bnxt_get_ulp_msix_num(struct bnxt *bp) 112 { 113 u32 roce_msix = BNXT_VF(bp) ? 114 BNXT_MAX_VF_ROCE_MSIX : BNXT_MAX_ROCE_MSIX; 115 116 return ((bp->flags & BNXT_FLAG_ROCE_CAP) ? 117 min_t(u32, roce_msix, num_online_cpus()) : 0); 118 } 119 120 int bnxt_get_ulp_msix_base(struct bnxt *bp) 121 { 122 if (bnxt_ulp_registered(bp->edev)) { 123 struct bnxt_en_dev *edev = bp->edev; 124 125 if (edev->ulp_tbl->msix_requested) 126 return edev->ulp_tbl->msix_base; 127 } 128 return 0; 129 } 130 131 int bnxt_get_ulp_stat_ctxs(struct bnxt *bp) 132 { 133 if (bnxt_ulp_registered(bp->edev)) { 134 struct bnxt_en_dev *edev = bp->edev; 135 136 if (edev->ulp_tbl->msix_requested) 137 return BNXT_MIN_ROCE_STAT_CTXS; 138 } 139 140 return 0; 141 } 142 143 int bnxt_send_msg(struct bnxt_en_dev *edev, 144 struct bnxt_fw_msg *fw_msg) 145 { 146 struct net_device *dev = edev->net; 147 struct bnxt *bp = netdev_priv(dev); 148 struct output *resp; 149 struct input *req; 150 u32 resp_len; 151 int rc; 152 153 if (bp->fw_reset_state) 154 return -EBUSY; 155 156 rc = hwrm_req_init(bp, req, 0 /* don't care */); 157 if (rc) 158 return rc; 159 160 rc = hwrm_req_replace(bp, req, fw_msg->msg, fw_msg->msg_len); 161 if (rc) 162 return rc; 163 164 hwrm_req_timeout(bp, req, fw_msg->timeout); 165 resp = hwrm_req_hold(bp, req); 166 rc = hwrm_req_send(bp, req); 167 resp_len = le16_to_cpu(resp->resp_len); 168 if (resp_len) { 169 if (fw_msg->resp_max_len < resp_len) 170 resp_len = fw_msg->resp_max_len; 171 172 memcpy(fw_msg->resp, resp, resp_len); 173 } 174 hwrm_req_drop(bp, req); 175 return rc; 176 } 177 EXPORT_SYMBOL(bnxt_send_msg); 178 179 void bnxt_ulp_stop(struct bnxt *bp) 180 { 181 struct bnxt_aux_priv *aux_priv = bp->aux_priv; 182 struct bnxt_en_dev *edev = bp->edev; 183 184 if (!edev) 185 return; 186 187 edev->flags |= BNXT_EN_FLAG_ULP_STOPPED; 188 if (aux_priv) { 189 struct auxiliary_device *adev; 190 191 adev = &aux_priv->aux_dev; 192 if (adev->dev.driver) { 193 struct auxiliary_driver *adrv; 194 pm_message_t pm = {}; 195 196 adrv = to_auxiliary_drv(adev->dev.driver); 197 edev->en_state = bp->state; 198 adrv->suspend(adev, pm); 199 } 200 } 201 } 202 203 void bnxt_ulp_start(struct bnxt *bp, int err) 204 { 205 struct bnxt_aux_priv *aux_priv = bp->aux_priv; 206 struct bnxt_en_dev *edev = bp->edev; 207 208 if (!edev) 209 return; 210 211 edev->flags &= ~BNXT_EN_FLAG_ULP_STOPPED; 212 213 if (err) 214 return; 215 216 if (aux_priv) { 217 struct auxiliary_device *adev; 218 219 adev = &aux_priv->aux_dev; 220 if (adev->dev.driver) { 221 struct auxiliary_driver *adrv; 222 223 adrv = to_auxiliary_drv(adev->dev.driver); 224 edev->en_state = bp->state; 225 adrv->resume(adev); 226 } 227 } 228 229 } 230 231 void bnxt_ulp_irq_stop(struct bnxt *bp) 232 { 233 struct bnxt_en_dev *edev = bp->edev; 234 struct bnxt_ulp_ops *ops; 235 236 if (!edev || !(edev->flags & BNXT_EN_FLAG_MSIX_REQUESTED)) 237 return; 238 239 if (bnxt_ulp_registered(bp->edev)) { 240 struct bnxt_ulp *ulp = edev->ulp_tbl; 241 242 if (!ulp->msix_requested) 243 return; 244 245 ops = rtnl_dereference(ulp->ulp_ops); 246 if (!ops || !ops->ulp_irq_stop) 247 return; 248 ops->ulp_irq_stop(ulp->handle); 249 } 250 } 251 252 void bnxt_ulp_irq_restart(struct bnxt *bp, int err) 253 { 254 struct bnxt_en_dev *edev = bp->edev; 255 struct bnxt_ulp_ops *ops; 256 257 if (!edev || !(edev->flags & BNXT_EN_FLAG_MSIX_REQUESTED)) 258 return; 259 260 if (bnxt_ulp_registered(bp->edev)) { 261 struct bnxt_ulp *ulp = edev->ulp_tbl; 262 struct bnxt_msix_entry *ent = NULL; 263 264 if (!ulp->msix_requested) 265 return; 266 267 ops = rtnl_dereference(ulp->ulp_ops); 268 if (!ops || !ops->ulp_irq_restart) 269 return; 270 271 if (!err) { 272 ent = kcalloc(ulp->msix_requested, sizeof(*ent), 273 GFP_KERNEL); 274 if (!ent) 275 return; 276 bnxt_fill_msix_vecs(bp, ent); 277 } 278 ops->ulp_irq_restart(ulp->handle, ent); 279 kfree(ent); 280 } 281 } 282 283 int bnxt_register_async_events(struct bnxt_en_dev *edev, 284 unsigned long *events_bmap, 285 u16 max_id) 286 { 287 struct net_device *dev = edev->net; 288 struct bnxt *bp = netdev_priv(dev); 289 struct bnxt_ulp *ulp; 290 291 ulp = edev->ulp_tbl; 292 ulp->async_events_bmap = events_bmap; 293 /* Make sure bnxt_ulp_async_events() sees this order */ 294 smp_wmb(); 295 ulp->max_async_event_id = max_id; 296 bnxt_hwrm_func_drv_rgtr(bp, events_bmap, max_id + 1, true); 297 return 0; 298 } 299 EXPORT_SYMBOL(bnxt_register_async_events); 300 301 void bnxt_rdma_aux_device_uninit(struct bnxt *bp) 302 { 303 struct bnxt_aux_priv *aux_priv; 304 struct auxiliary_device *adev; 305 306 /* Skip if no auxiliary device init was done. */ 307 if (!bp->aux_priv) 308 return; 309 310 aux_priv = bp->aux_priv; 311 adev = &aux_priv->aux_dev; 312 auxiliary_device_delete(adev); 313 auxiliary_device_uninit(adev); 314 } 315 316 static void bnxt_aux_dev_release(struct device *dev) 317 { 318 struct bnxt_aux_priv *aux_priv = 319 container_of(dev, struct bnxt_aux_priv, aux_dev.dev); 320 struct bnxt *bp = netdev_priv(aux_priv->edev->net); 321 322 ida_free(&bnxt_aux_dev_ids, aux_priv->id); 323 kfree(aux_priv->edev->ulp_tbl); 324 bp->edev = NULL; 325 kfree(aux_priv->edev); 326 kfree(aux_priv); 327 bp->aux_priv = NULL; 328 } 329 330 static void bnxt_set_edev_info(struct bnxt_en_dev *edev, struct bnxt *bp) 331 { 332 edev->net = bp->dev; 333 edev->pdev = bp->pdev; 334 edev->l2_db_size = bp->db_size; 335 edev->l2_db_size_nc = bp->db_size; 336 337 if (bp->flags & BNXT_FLAG_ROCEV1_CAP) 338 edev->flags |= BNXT_EN_FLAG_ROCEV1_CAP; 339 if (bp->flags & BNXT_FLAG_ROCEV2_CAP) 340 edev->flags |= BNXT_EN_FLAG_ROCEV2_CAP; 341 if (bp->flags & BNXT_FLAG_VF) 342 edev->flags |= BNXT_EN_FLAG_VF; 343 344 edev->chip_num = bp->chip_num; 345 edev->hw_ring_stats_size = bp->hw_ring_stats_size; 346 edev->pf_port_id = bp->pf.port_id; 347 edev->en_state = bp->state; 348 349 edev->ulp_tbl->msix_requested = bnxt_get_ulp_msix_num(bp); 350 } 351 352 void bnxt_rdma_aux_device_init(struct bnxt *bp) 353 { 354 struct auxiliary_device *aux_dev; 355 struct bnxt_aux_priv *aux_priv; 356 struct bnxt_en_dev *edev; 357 struct bnxt_ulp *ulp; 358 int rc; 359 360 if (!(bp->flags & BNXT_FLAG_ROCE_CAP)) 361 return; 362 363 aux_priv = kzalloc(sizeof(*bp->aux_priv), GFP_KERNEL); 364 if (!aux_priv) 365 goto exit; 366 367 aux_priv->id = ida_alloc(&bnxt_aux_dev_ids, GFP_KERNEL); 368 if (aux_priv->id < 0) { 369 netdev_warn(bp->dev, 370 "ida alloc failed for ROCE auxiliary device\n"); 371 kfree(aux_priv); 372 goto exit; 373 } 374 375 aux_dev = &aux_priv->aux_dev; 376 aux_dev->id = aux_priv->id; 377 aux_dev->name = "rdma"; 378 aux_dev->dev.parent = &bp->pdev->dev; 379 aux_dev->dev.release = bnxt_aux_dev_release; 380 381 rc = auxiliary_device_init(aux_dev); 382 if (rc) { 383 ida_free(&bnxt_aux_dev_ids, aux_priv->id); 384 kfree(aux_priv); 385 goto exit; 386 } 387 bp->aux_priv = aux_priv; 388 389 /* From this point, all cleanup will happen via the .release callback & 390 * any error unwinding will need to include a call to 391 * auxiliary_device_uninit. 392 */ 393 edev = kzalloc(sizeof(*edev), GFP_KERNEL); 394 if (!edev) 395 goto aux_dev_uninit; 396 397 ulp = kzalloc(sizeof(*ulp), GFP_KERNEL); 398 if (!ulp) 399 goto aux_dev_uninit; 400 401 edev->ulp_tbl = ulp; 402 aux_priv->edev = edev; 403 bp->edev = edev; 404 bnxt_set_edev_info(edev, bp); 405 406 rc = auxiliary_device_add(aux_dev); 407 if (rc) { 408 netdev_warn(bp->dev, 409 "Failed to add auxiliary device for ROCE\n"); 410 goto aux_dev_uninit; 411 } 412 413 return; 414 415 aux_dev_uninit: 416 auxiliary_device_uninit(aux_dev); 417 exit: 418 bp->flags &= ~BNXT_FLAG_ROCE_CAP; 419 } 420