drivers/net/ethernet/broadcom/bnxt/bnxt_ulp.c

   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         struct bnxt_hw_resc *hw_resc;
 117         int max_idx, max_cp_rings;
 118         int avail_msix, idx;
 119         int total_vecs;
 120         int rc = 0;
 121
 122         ASSERT_RTNL();
 123         if (ulp_id != BNXT_ROCE_ULP)
 124                 return -EINVAL;
 125
 126         if (!(bp->flags & BNXT_FLAG_USING_MSIX))
 127                 return -ENODEV;
 128
 129         if (edev->ulp_tbl[ulp_id].msix_requested)
 130                 return -EAGAIN;
 131
 132         max_cp_rings = bnxt_get_max_func_cp_rings(bp);
 133         avail_msix = bnxt_get_avail_msix(bp, num_msix);
 134         if (!avail_msix)
 135                 return -ENOMEM;
 136         if (avail_msix > num_msix)
 137                 avail_msix = num_msix;
 138
 139         if (BNXT_NEW_RM(bp)) {
 140                 idx = bp->cp_nr_rings;
 141         } else {
 142                 max_idx = min_t(int, bp->total_irqs, max_cp_rings);
 143                 idx = max_idx - avail_msix;
 144         }
 145         edev->ulp_tbl[ulp_id].msix_base = idx;
 146         edev->ulp_tbl[ulp_id].msix_requested = avail_msix;
 147         hw_resc = &bp->hw_resc;
 148         total_vecs = idx + avail_msix;
 149         if (bp->total_irqs < total_vecs ||
 150             (BNXT_NEW_RM(bp) && hw_resc->resv_irqs < total_vecs)) {
 151                 if (netif_running(dev)) {
 152                         bnxt_close_nic(bp, true, false);
 153                         rc = bnxt_open_nic(bp, true, false);
 154                 } else {
 155                         rc = bnxt_reserve_rings(bp, true);
 156                 }
 157         }
 158         if (rc) {
 159                 edev->ulp_tbl[ulp_id].msix_requested = 0;
 160                 return -EAGAIN;
 161         }
 162
 163         if (BNXT_NEW_RM(bp)) {
 164                 int resv_msix;
 165
 166                 resv_msix = hw_resc->resv_irqs - bp->cp_nr_rings;
 167                 avail_msix = min_t(int, resv_msix, avail_msix);
 168                 edev->ulp_tbl[ulp_id].msix_requested = avail_msix;
 169         }
 170         bnxt_fill_msix_vecs(bp, ent);
 171         edev->flags |= BNXT_EN_FLAG_MSIX_REQUESTED;
 172         return avail_msix;
 173 }
 174
 175 static int bnxt_free_msix_vecs(struct bnxt_en_dev *edev, int ulp_id)
 176 {
 177         struct net_device *dev = edev->net;
 178         struct bnxt *bp = netdev_priv(dev);
 179
 180         ASSERT_RTNL();
 181         if (ulp_id != BNXT_ROCE_ULP)
 182                 return -EINVAL;
 183
 184         if (!(edev->flags & BNXT_EN_FLAG_MSIX_REQUESTED))
 185                 return 0;
 186
 187         edev->ulp_tbl[ulp_id].msix_requested = 0;
 188         edev->flags &= ~BNXT_EN_FLAG_MSIX_REQUESTED;
 189         if (netif_running(dev) && !(edev->flags & BNXT_EN_FLAG_ULP_STOPPED)) {
 190                 bnxt_close_nic(bp, true, false);
 191                 bnxt_open_nic(bp, true, false);
 192         }
 193         return 0;
 194 }
 195
 196 int bnxt_get_ulp_msix_num(struct bnxt *bp)
 197 {
 198         if (bnxt_ulp_registered(bp->edev, BNXT_ROCE_ULP)) {
 199                 struct bnxt_en_dev *edev = bp->edev;
 200
 201                 return edev->ulp_tbl[BNXT_ROCE_ULP].msix_requested;
 202         }
 203         return 0;
 204 }
 205
 206 int bnxt_get_ulp_msix_base(struct bnxt *bp)
 207 {
 208         if (bnxt_ulp_registered(bp->edev, BNXT_ROCE_ULP)) {
 209                 struct bnxt_en_dev *edev = bp->edev;
 210
 211                 if (edev->ulp_tbl[BNXT_ROCE_ULP].msix_requested)
 212                         return edev->ulp_tbl[BNXT_ROCE_ULP].msix_base;
 213         }
 214         return 0;
 215 }
 216
 217 int bnxt_get_ulp_stat_ctxs(struct bnxt *bp)
 218 {
 219         if (bnxt_ulp_registered(bp->edev, BNXT_ROCE_ULP))
 220                 return BNXT_MIN_ROCE_STAT_CTXS;
 221
 222         return 0;
 223 }
 224
 225 static int bnxt_send_msg(struct bnxt_en_dev *edev, int ulp_id,
 226                          struct bnxt_fw_msg *fw_msg)
 227 {
 228         struct net_device *dev = edev->net;
 229         struct bnxt *bp = netdev_priv(dev);
 230         struct input *req;
 231         int rc;
 232
 233         if (ulp_id != BNXT_ROCE_ULP && bp->fw_reset_state)
 234                 return -EBUSY;
 235
 236         mutex_lock(&bp->hwrm_cmd_lock);
 237         req = fw_msg->msg;
 238         req->resp_addr = cpu_to_le64(bp->hwrm_cmd_resp_dma_addr);
 239         rc = _hwrm_send_message(bp, fw_msg->msg, fw_msg->msg_len,
 240                                 fw_msg->timeout);
 241         if (!rc) {
 242                 struct output *resp = bp->hwrm_cmd_resp_addr;
 243                 u32 len = le16_to_cpu(resp->resp_len);
 244
 245                 if (fw_msg->resp_max_len < len)
 246                         len = fw_msg->resp_max_len;
 247
 248                 memcpy(fw_msg->resp, resp, len);
 249         }
 250         mutex_unlock(&bp->hwrm_cmd_lock);
 251         return rc;
 252 }
 253
 254 static void bnxt_ulp_get(struct bnxt_ulp *ulp)
 255 {
 256         atomic_inc(&ulp->ref_count);
 257 }
 258
 259 static void bnxt_ulp_put(struct bnxt_ulp *ulp)
 260 {
 261         atomic_dec(&ulp->ref_count);
 262 }
 263
 264 void bnxt_ulp_stop(struct bnxt *bp)
 265 {
 266         struct bnxt_en_dev *edev = bp->edev;
 267         struct bnxt_ulp_ops *ops;
 268         int i;
 269
 270         if (!edev)
 271                 return;
 272
 273         edev->flags |= BNXT_EN_FLAG_ULP_STOPPED;
 274         for (i = 0; i < BNXT_MAX_ULP; i++) {
 275                 struct bnxt_ulp *ulp = &edev->ulp_tbl[i];
 276
 277                 ops = rtnl_dereference(ulp->ulp_ops);
 278                 if (!ops || !ops->ulp_stop)
 279                         continue;
 280                 ops->ulp_stop(ulp->handle);
 281         }
 282 }
 283
 284 void bnxt_ulp_start(struct bnxt *bp, int err)
 285 {
 286         struct bnxt_en_dev *edev = bp->edev;
 287         struct bnxt_ulp_ops *ops;
 288         int i;
 289
 290         if (!edev)
 291                 return;
 292
 293         edev->flags &= ~BNXT_EN_FLAG_ULP_STOPPED;
 294
 295         if (err)
 296                 return;
 297
 298         for (i = 0; i < BNXT_MAX_ULP; i++) {
 299                 struct bnxt_ulp *ulp = &edev->ulp_tbl[i];
 300
 301                 ops = rtnl_dereference(ulp->ulp_ops);
 302                 if (!ops || !ops->ulp_start)
 303                         continue;
 304                 ops->ulp_start(ulp->handle);
 305         }
 306 }
 307
 308 void bnxt_ulp_sriov_cfg(struct bnxt *bp, int num_vfs)
 309 {
 310         struct bnxt_en_dev *edev = bp->edev;
 311         struct bnxt_ulp_ops *ops;
 312         int i;
 313
 314         if (!edev)
 315                 return;
 316
 317         for (i = 0; i < BNXT_MAX_ULP; i++) {
 318                 struct bnxt_ulp *ulp = &edev->ulp_tbl[i];
 319
 320                 rcu_read_lock();
 321                 ops = rcu_dereference(ulp->ulp_ops);
 322                 if (!ops || !ops->ulp_sriov_config) {
 323                         rcu_read_unlock();
 324                         continue;
 325                 }
 326                 bnxt_ulp_get(ulp);
 327                 rcu_read_unlock();
 328                 ops->ulp_sriov_config(ulp->handle, num_vfs);
 329                 bnxt_ulp_put(ulp);
 330         }
 331 }
 332
 333 void bnxt_ulp_shutdown(struct bnxt *bp)
 334 {
 335         struct bnxt_en_dev *edev = bp->edev;
 336         struct bnxt_ulp_ops *ops;
 337         int i;
 338
 339         if (!edev)
 340                 return;
 341
 342         for (i = 0; i < BNXT_MAX_ULP; i++) {
 343                 struct bnxt_ulp *ulp = &edev->ulp_tbl[i];
 344
 345                 ops = rtnl_dereference(ulp->ulp_ops);
 346                 if (!ops || !ops->ulp_shutdown)
 347                         continue;
 348                 ops->ulp_shutdown(ulp->handle);
 349         }
 350 }
 351
 352 void bnxt_ulp_irq_stop(struct bnxt *bp)
 353 {
 354         struct bnxt_en_dev *edev = bp->edev;
 355         struct bnxt_ulp_ops *ops;
 356
 357         if (!edev || !(edev->flags & BNXT_EN_FLAG_MSIX_REQUESTED))
 358                 return;
 359
 360         if (bnxt_ulp_registered(bp->edev, BNXT_ROCE_ULP)) {
 361                 struct bnxt_ulp *ulp = &edev->ulp_tbl[BNXT_ROCE_ULP];
 362
 363                 if (!ulp->msix_requested)
 364                         return;
 365
 366                 ops = rtnl_dereference(ulp->ulp_ops);
 367                 if (!ops || !ops->ulp_irq_stop)
 368                         return;
 369                 ops->ulp_irq_stop(ulp->handle);
 370         }
 371 }
 372
 373 void bnxt_ulp_irq_restart(struct bnxt *bp, int err)
 374 {
 375         struct bnxt_en_dev *edev = bp->edev;
 376         struct bnxt_ulp_ops *ops;
 377
 378         if (!edev || !(edev->flags & BNXT_EN_FLAG_MSIX_REQUESTED))
 379                 return;
 380
 381         if (bnxt_ulp_registered(bp->edev, BNXT_ROCE_ULP)) {
 382                 struct bnxt_ulp *ulp = &edev->ulp_tbl[BNXT_ROCE_ULP];
 383                 struct bnxt_msix_entry *ent = NULL;
 384
 385                 if (!ulp->msix_requested)
 386                         return;
 387
 388                 ops = rtnl_dereference(ulp->ulp_ops);
 389                 if (!ops || !ops->ulp_irq_restart)
 390                         return;
 391
 392                 if (!err) {
 393                         ent = kcalloc(ulp->msix_requested, sizeof(*ent),
 394                                       GFP_KERNEL);
 395                         if (!ent)
 396                                 return;
 397                         bnxt_fill_msix_vecs(bp, ent);
 398                 }
 399                 ops->ulp_irq_restart(ulp->handle, ent);
 400                 kfree(ent);
 401         }
 402 }
 403
 404 void bnxt_ulp_async_events(struct bnxt *bp, struct hwrm_async_event_cmpl *cmpl)
 405 {
 406         u16 event_id = le16_to_cpu(cmpl->event_id);
 407         struct bnxt_en_dev *edev = bp->edev;
 408         struct bnxt_ulp_ops *ops;
 409         int i;
 410
 411         if (!edev)
 412                 return;
 413
 414         rcu_read_lock();
 415         for (i = 0; i < BNXT_MAX_ULP; i++) {
 416                 struct bnxt_ulp *ulp = &edev->ulp_tbl[i];
 417
 418                 ops = rcu_dereference(ulp->ulp_ops);
 419                 if (!ops || !ops->ulp_async_notifier)
 420                         continue;
 421                 if (!ulp->async_events_bmap ||
 422                     event_id > ulp->max_async_event_id)
 423                         continue;
 424
 425                 /* Read max_async_event_id first before testing the bitmap. */
 426                 smp_rmb();
 427                 if (test_bit(event_id, ulp->async_events_bmap))
 428                         ops->ulp_async_notifier(ulp->handle, cmpl);
 429         }
 430         rcu_read_unlock();
 431 }
 432
 433 static int bnxt_register_async_events(struct bnxt_en_dev *edev, int ulp_id,
 434                                       unsigned long *events_bmap, u16 max_id)
 435 {
 436         struct net_device *dev = edev->net;
 437         struct bnxt *bp = netdev_priv(dev);
 438         struct bnxt_ulp *ulp;
 439
 440         if (ulp_id >= BNXT_MAX_ULP)
 441                 return -EINVAL;
 442
 443         ulp = &edev->ulp_tbl[ulp_id];
 444         ulp->async_events_bmap = events_bmap;
 445         /* Make sure bnxt_ulp_async_events() sees this order */
 446         smp_wmb();
 447         ulp->max_async_event_id = max_id;
 448         bnxt_hwrm_func_drv_rgtr(bp, events_bmap, max_id + 1, true);
 449         return 0;
 450 }
 451
 452 static const struct bnxt_en_ops bnxt_en_ops_tbl = {
 453         .bnxt_register_device   = bnxt_register_dev,
 454         .bnxt_unregister_device = bnxt_unregister_dev,
 455         .bnxt_request_msix      = bnxt_req_msix_vecs,
 456         .bnxt_free_msix         = bnxt_free_msix_vecs,
 457         .bnxt_send_fw_msg       = bnxt_send_msg,
 458         .bnxt_register_fw_async_events  = bnxt_register_async_events,
 459 };
 460
 461 struct bnxt_en_dev *bnxt_ulp_probe(struct net_device *dev)
 462 {
 463         struct bnxt *bp = netdev_priv(dev);
 464         struct bnxt_en_dev *edev;
 465
 466         edev = bp->edev;
 467         if (!edev) {
 468                 edev = kzalloc(sizeof(*edev), GFP_KERNEL);
 469                 if (!edev)
 470                         return ERR_PTR(-ENOMEM);
 471                 edev->en_ops = &bnxt_en_ops_tbl;
 472                 if (bp->flags & BNXT_FLAG_ROCEV1_CAP)
 473                         edev->flags |= BNXT_EN_FLAG_ROCEV1_CAP;
 474                 if (bp->flags & BNXT_FLAG_ROCEV2_CAP)
 475                         edev->flags |= BNXT_EN_FLAG_ROCEV2_CAP;
 476                 edev->net = dev;
 477                 edev->pdev = bp->pdev;
 478                 bp->edev = edev;
 479         }
 480         return bp->edev;
 481 }