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->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 (bp->flags & BNXT_FLAG_NEW_RM) {
 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 (bp->flags & BNXT_FLAG_NEW_RM) {
 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         bnxt_set_max_func_cp_rings(bp, max_cp_rings - avail_msix);
 173         edev->flags |= BNXT_EN_FLAG_MSIX_REQUESTED;
 174         return avail_msix;
 175 }
 176
 177 static int bnxt_free_msix_vecs(struct bnxt_en_dev *edev, int ulp_id)
 178 {
 179         struct net_device *dev = edev->net;
 180         struct bnxt *bp = netdev_priv(dev);
 181         int max_cp_rings, msix_requested;
 182
 183         ASSERT_RTNL();
 184         if (ulp_id != BNXT_ROCE_ULP)
 185                 return -EINVAL;
 186
 187         if (!(edev->flags & BNXT_EN_FLAG_MSIX_REQUESTED))
 188                 return 0;
 189
 190         max_cp_rings = bnxt_get_max_func_cp_rings(bp);
 191         msix_requested = edev->ulp_tbl[ulp_id].msix_requested;
 192         bnxt_set_max_func_cp_rings(bp, max_cp_rings + msix_requested);
 193         edev->ulp_tbl[ulp_id].msix_requested = 0;
 194         edev->flags &= ~BNXT_EN_FLAG_MSIX_REQUESTED;
 195         if (netif_running(dev)) {
 196                 bnxt_close_nic(bp, true, false);
 197                 bnxt_open_nic(bp, true, false);
 198         }
 199         return 0;
 200 }
 201
 202 int bnxt_get_ulp_msix_num(struct bnxt *bp)
 203 {
 204         if (bnxt_ulp_registered(bp->edev, BNXT_ROCE_ULP)) {
 205                 struct bnxt_en_dev *edev = bp->edev;
 206
 207                 return edev->ulp_tbl[BNXT_ROCE_ULP].msix_requested;
 208         }
 209         return 0;
 210 }
 211
 212 int bnxt_get_ulp_msix_base(struct bnxt *bp)
 213 {
 214         if (bnxt_ulp_registered(bp->edev, BNXT_ROCE_ULP)) {
 215                 struct bnxt_en_dev *edev = bp->edev;
 216
 217                 if (edev->ulp_tbl[BNXT_ROCE_ULP].msix_requested)
 218                         return edev->ulp_tbl[BNXT_ROCE_ULP].msix_base;
 219         }
 220         return 0;
 221 }
 222
 223 void bnxt_subtract_ulp_resources(struct bnxt *bp, int ulp_id)
 224 {
 225         ASSERT_RTNL();
 226         if (bnxt_ulp_registered(bp->edev, ulp_id)) {
 227                 struct bnxt_en_dev *edev = bp->edev;
 228                 unsigned int msix_req, max;
 229
 230                 msix_req = edev->ulp_tbl[ulp_id].msix_requested;
 231                 max = bnxt_get_max_func_cp_rings(bp);
 232                 bnxt_set_max_func_cp_rings(bp, max - msix_req);
 233                 max = bnxt_get_max_func_stat_ctxs(bp);
 234                 bnxt_set_max_func_stat_ctxs(bp, max - 1);
 235         }
 236 }
 237
 238 static int bnxt_send_msg(struct bnxt_en_dev *edev, int ulp_id,
 239                          struct bnxt_fw_msg *fw_msg)
 240 {
 241         struct net_device *dev = edev->net;
 242         struct bnxt *bp = netdev_priv(dev);
 243         struct input *req;
 244         int rc;
 245
 246         mutex_lock(&bp->hwrm_cmd_lock);
 247         req = fw_msg->msg;
 248         req->resp_addr = cpu_to_le64(bp->hwrm_cmd_resp_dma_addr);
 249         rc = _hwrm_send_message(bp, fw_msg->msg, fw_msg->msg_len,
 250                                 fw_msg->timeout);
 251         if (!rc) {
 252                 struct output *resp = bp->hwrm_cmd_resp_addr;
 253                 u32 len = le16_to_cpu(resp->resp_len);
 254
 255                 if (fw_msg->resp_max_len < len)
 256                         len = fw_msg->resp_max_len;
 257
 258                 memcpy(fw_msg->resp, resp, len);
 259         }
 260         mutex_unlock(&bp->hwrm_cmd_lock);
 261         return rc;
 262 }
 263
 264 static void bnxt_ulp_get(struct bnxt_ulp *ulp)
 265 {
 266         atomic_inc(&ulp->ref_count);
 267 }
 268
 269 static void bnxt_ulp_put(struct bnxt_ulp *ulp)
 270 {
 271         atomic_dec(&ulp->ref_count);
 272 }
 273
 274 void bnxt_ulp_stop(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_stop)
 288                         continue;
 289                 ops->ulp_stop(ulp->handle);
 290         }
 291 }
 292
 293 void bnxt_ulp_start(struct bnxt *bp)
 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                 ops = rtnl_dereference(ulp->ulp_ops);
 306                 if (!ops || !ops->ulp_start)
 307                         continue;
 308                 ops->ulp_start(ulp->handle);
 309         }
 310 }
 311
 312 void bnxt_ulp_sriov_cfg(struct bnxt *bp, int num_vfs)
 313 {
 314         struct bnxt_en_dev *edev = bp->edev;
 315         struct bnxt_ulp_ops *ops;
 316         int i;
 317
 318         if (!edev)
 319                 return;
 320
 321         for (i = 0; i < BNXT_MAX_ULP; i++) {
 322                 struct bnxt_ulp *ulp = &edev->ulp_tbl[i];
 323
 324                 rcu_read_lock();
 325                 ops = rcu_dereference(ulp->ulp_ops);
 326                 if (!ops || !ops->ulp_sriov_config) {
 327                         rcu_read_unlock();
 328                         continue;
 329                 }
 330                 bnxt_ulp_get(ulp);
 331                 rcu_read_unlock();
 332                 ops->ulp_sriov_config(ulp->handle, num_vfs);
 333                 bnxt_ulp_put(ulp);
 334         }
 335 }
 336
 337 void bnxt_ulp_shutdown(struct bnxt *bp)
 338 {
 339         struct bnxt_en_dev *edev = bp->edev;
 340         struct bnxt_ulp_ops *ops;
 341         int i;
 342
 343         if (!edev)
 344                 return;
 345
 346         for (i = 0; i < BNXT_MAX_ULP; i++) {
 347                 struct bnxt_ulp *ulp = &edev->ulp_tbl[i];
 348
 349                 ops = rtnl_dereference(ulp->ulp_ops);
 350                 if (!ops || !ops->ulp_shutdown)
 351                         continue;
 352                 ops->ulp_shutdown(ulp->handle);
 353         }
 354 }
 355
 356 void bnxt_ulp_irq_stop(struct bnxt *bp)
 357 {
 358         struct bnxt_en_dev *edev = bp->edev;
 359         struct bnxt_ulp_ops *ops;
 360
 361         if (!edev || !(edev->flags & BNXT_EN_FLAG_MSIX_REQUESTED))
 362                 return;
 363
 364         if (bnxt_ulp_registered(bp->edev, BNXT_ROCE_ULP)) {
 365                 struct bnxt_ulp *ulp = &edev->ulp_tbl[BNXT_ROCE_ULP];
 366
 367                 if (!ulp->msix_requested)
 368                         return;
 369
 370                 ops = rtnl_dereference(ulp->ulp_ops);
 371                 if (!ops || !ops->ulp_irq_stop)
 372                         return;
 373                 ops->ulp_irq_stop(ulp->handle);
 374         }
 375 }
 376
 377 void bnxt_ulp_irq_restart(struct bnxt *bp, int err)
 378 {
 379         struct bnxt_en_dev *edev = bp->edev;
 380         struct bnxt_ulp_ops *ops;
 381
 382         if (!edev || !(edev->flags & BNXT_EN_FLAG_MSIX_REQUESTED))
 383                 return;
 384
 385         if (bnxt_ulp_registered(bp->edev, BNXT_ROCE_ULP)) {
 386                 struct bnxt_ulp *ulp = &edev->ulp_tbl[BNXT_ROCE_ULP];
 387                 struct bnxt_msix_entry *ent = NULL;
 388
 389                 if (!ulp->msix_requested)
 390                         return;
 391
 392                 ops = rtnl_dereference(ulp->ulp_ops);
 393                 if (!ops || !ops->ulp_irq_restart)
 394                         return;
 395
 396                 if (!err) {
 397                         ent = kcalloc(ulp->msix_requested, sizeof(*ent),
 398                                       GFP_KERNEL);
 399                         if (!ent)
 400                                 return;
 401                         bnxt_fill_msix_vecs(bp, ent);
 402                 }
 403                 ops->ulp_irq_restart(ulp->handle, ent);
 404                 kfree(ent);
 405         }
 406 }
 407
 408 void bnxt_ulp_async_events(struct bnxt *bp, struct hwrm_async_event_cmpl *cmpl)
 409 {
 410         u16 event_id = le16_to_cpu(cmpl->event_id);
 411         struct bnxt_en_dev *edev = bp->edev;
 412         struct bnxt_ulp_ops *ops;
 413         int i;
 414
 415         if (!edev)
 416                 return;
 417
 418         rcu_read_lock();
 419         for (i = 0; i < BNXT_MAX_ULP; i++) {
 420                 struct bnxt_ulp *ulp = &edev->ulp_tbl[i];
 421
 422                 ops = rcu_dereference(ulp->ulp_ops);
 423                 if (!ops || !ops->ulp_async_notifier)
 424                         continue;
 425                 if (!ulp->async_events_bmap ||
 426                     event_id > ulp->max_async_event_id)
 427                         continue;
 428
 429                 /* Read max_async_event_id first before testing the bitmap. */
 430                 smp_rmb();
 431                 if (test_bit(event_id, ulp->async_events_bmap))
 432                         ops->ulp_async_notifier(ulp->handle, cmpl);
 433         }
 434         rcu_read_unlock();
 435 }
 436
 437 static int bnxt_register_async_events(struct bnxt_en_dev *edev, int ulp_id,
 438                                       unsigned long *events_bmap, u16 max_id)
 439 {
 440         struct net_device *dev = edev->net;
 441         struct bnxt *bp = netdev_priv(dev);
 442         struct bnxt_ulp *ulp;
 443
 444         if (ulp_id >= BNXT_MAX_ULP)
 445                 return -EINVAL;
 446
 447         ulp = &edev->ulp_tbl[ulp_id];
 448         ulp->async_events_bmap = events_bmap;
 449         /* Make sure bnxt_ulp_async_events() sees this order */
 450         smp_wmb();
 451         ulp->max_async_event_id = max_id;
 452         bnxt_hwrm_func_rgtr_async_events(bp, events_bmap, max_id + 1);
 453         return 0;
 454 }
 455
 456 static const struct bnxt_en_ops bnxt_en_ops_tbl = {
 457         .bnxt_register_device   = bnxt_register_dev,
 458         .bnxt_unregister_device = bnxt_unregister_dev,
 459         .bnxt_request_msix      = bnxt_req_msix_vecs,
 460         .bnxt_free_msix         = bnxt_free_msix_vecs,
 461         .bnxt_send_fw_msg       = bnxt_send_msg,
 462         .bnxt_register_fw_async_events  = bnxt_register_async_events,
 463 };
 464
 465 struct bnxt_en_dev *bnxt_ulp_probe(struct net_device *dev)
 466 {
 467         struct bnxt *bp = netdev_priv(dev);
 468         struct bnxt_en_dev *edev;
 469
 470         edev = bp->edev;
 471         if (!edev) {
 472                 edev = kzalloc(sizeof(*edev), GFP_KERNEL);
 473                 if (!edev)
 474                         return ERR_PTR(-ENOMEM);
 475                 edev->en_ops = &bnxt_en_ops_tbl;
 476                 if (bp->flags & BNXT_FLAG_ROCEV1_CAP)
 477                         edev->flags |= BNXT_EN_FLAG_ROCEV1_CAP;
 478                 if (bp->flags & BNXT_FLAG_ROCEV2_CAP)
 479                         edev->flags |= BNXT_EN_FLAG_ROCEV2_CAP;
 480                 edev->net = dev;
 481                 edev->pdev = bp->pdev;
 482                 bp->edev = edev;
 483         }
 484         return bp->edev;
 485 }