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                 if (bp->flags & BNXT_FLAG_CHIP_P5) {
 108                         ent[i].db_offset = DB_PF_OFFSET_P5;
 109                         if (BNXT_VF(bp))
 110                                 ent[i].db_offset = DB_VF_OFFSET_P5;
 111                 } else {
 112                         ent[i].db_offset = (idx + i) * 0x80;
 113                 }
 114         }
 115 }
 116
 117 static int bnxt_req_msix_vecs(struct bnxt_en_dev *edev, int ulp_id,
 118                               struct bnxt_msix_entry *ent, int num_msix)
 119 {
 120         struct net_device *dev = edev->net;
 121         struct bnxt *bp = netdev_priv(dev);
 122         struct bnxt_hw_resc *hw_resc;
 123         int max_idx, max_cp_rings;
 124         int avail_msix, idx;
 125         int total_vecs;
 126         int rc = 0;
 127
 128         ASSERT_RTNL();
 129         if (ulp_id != BNXT_ROCE_ULP)
 130                 return -EINVAL;
 131
 132         if (!(bp->flags & BNXT_FLAG_USING_MSIX))
 133                 return -ENODEV;
 134
 135         if (edev->ulp_tbl[ulp_id].msix_requested)
 136                 return -EAGAIN;
 137
 138         max_cp_rings = bnxt_get_max_func_cp_rings(bp);
 139         avail_msix = bnxt_get_avail_msix(bp, num_msix);
 140         if (!avail_msix)
 141                 return -ENOMEM;
 142         if (avail_msix > num_msix)
 143                 avail_msix = num_msix;
 144
 145         if (BNXT_NEW_RM(bp)) {
 146                 idx = bp->cp_nr_rings;
 147         } else {
 148                 max_idx = min_t(int, bp->total_irqs, max_cp_rings);
 149                 idx = max_idx - avail_msix;
 150         }
 151         edev->ulp_tbl[ulp_id].msix_base = idx;
 152         edev->ulp_tbl[ulp_id].msix_requested = avail_msix;
 153         hw_resc = &bp->hw_resc;
 154         total_vecs = idx + avail_msix;
 155         if (bp->total_irqs < total_vecs ||
 156             (BNXT_NEW_RM(bp) && hw_resc->resv_irqs < total_vecs)) {
 157                 if (netif_running(dev)) {
 158                         bnxt_close_nic(bp, true, false);
 159                         rc = bnxt_open_nic(bp, true, false);
 160                 } else {
 161                         rc = bnxt_reserve_rings(bp, true);
 162                 }
 163         }
 164         if (rc) {
 165                 edev->ulp_tbl[ulp_id].msix_requested = 0;
 166                 return -EAGAIN;
 167         }
 168
 169         if (BNXT_NEW_RM(bp)) {
 170                 int resv_msix;
 171
 172                 resv_msix = hw_resc->resv_irqs - bp->cp_nr_rings;
 173                 avail_msix = min_t(int, resv_msix, avail_msix);
 174                 edev->ulp_tbl[ulp_id].msix_requested = avail_msix;
 175         }
 176         bnxt_fill_msix_vecs(bp, ent);
 177         edev->flags |= BNXT_EN_FLAG_MSIX_REQUESTED;
 178         return avail_msix;
 179 }
 180
 181 static int bnxt_free_msix_vecs(struct bnxt_en_dev *edev, int ulp_id)
 182 {
 183         struct net_device *dev = edev->net;
 184         struct bnxt *bp = netdev_priv(dev);
 185
 186         ASSERT_RTNL();
 187         if (ulp_id != BNXT_ROCE_ULP)
 188                 return -EINVAL;
 189
 190         if (!(edev->flags & BNXT_EN_FLAG_MSIX_REQUESTED))
 191                 return 0;
 192
 193         edev->ulp_tbl[ulp_id].msix_requested = 0;
 194         edev->flags &= ~BNXT_EN_FLAG_MSIX_REQUESTED;
 195         if (netif_running(dev) && !(edev->flags & BNXT_EN_FLAG_ULP_STOPPED)) {
 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 int bnxt_get_ulp_stat_ctxs(struct bnxt *bp)
 224 {
 225         if (bnxt_ulp_registered(bp->edev, BNXT_ROCE_ULP))
 226                 return BNXT_MIN_ROCE_STAT_CTXS;
 227
 228         return 0;
 229 }
 230
 231 static int bnxt_send_msg(struct bnxt_en_dev *edev, int ulp_id,
 232                          struct bnxt_fw_msg *fw_msg)
 233 {
 234         struct net_device *dev = edev->net;
 235         struct bnxt *bp = netdev_priv(dev);
 236         struct input *req;
 237         int rc;
 238
 239         if (ulp_id != BNXT_ROCE_ULP && bp->fw_reset_state)
 240                 return -EBUSY;
 241
 242         mutex_lock(&bp->hwrm_cmd_lock);
 243         req = fw_msg->msg;
 244         req->resp_addr = cpu_to_le64(bp->hwrm_cmd_resp_dma_addr);
 245         rc = _hwrm_send_message(bp, fw_msg->msg, fw_msg->msg_len,
 246                                 fw_msg->timeout);
 247         if (!rc) {
 248                 struct output *resp = bp->hwrm_cmd_resp_addr;
 249                 u32 len = le16_to_cpu(resp->resp_len);
 250
 251                 if (fw_msg->resp_max_len < len)
 252                         len = fw_msg->resp_max_len;
 253
 254                 memcpy(fw_msg->resp, resp, len);
 255         }
 256         mutex_unlock(&bp->hwrm_cmd_lock);
 257         return rc;
 258 }
 259
 260 static void bnxt_ulp_get(struct bnxt_ulp *ulp)
 261 {
 262         atomic_inc(&ulp->ref_count);
 263 }
 264
 265 static void bnxt_ulp_put(struct bnxt_ulp *ulp)
 266 {
 267         atomic_dec(&ulp->ref_count);
 268 }
 269
 270 void bnxt_ulp_stop(struct bnxt *bp)
 271 {
 272         struct bnxt_en_dev *edev = bp->edev;
 273         struct bnxt_ulp_ops *ops;
 274         int i;
 275
 276         if (!edev)
 277                 return;
 278
 279         edev->flags |= BNXT_EN_FLAG_ULP_STOPPED;
 280         for (i = 0; i < BNXT_MAX_ULP; i++) {
 281                 struct bnxt_ulp *ulp = &edev->ulp_tbl[i];
 282
 283                 ops = rtnl_dereference(ulp->ulp_ops);
 284                 if (!ops || !ops->ulp_stop)
 285                         continue;
 286                 ops->ulp_stop(ulp->handle);
 287         }
 288 }
 289
 290 void bnxt_ulp_start(struct bnxt *bp, int err)
 291 {
 292         struct bnxt_en_dev *edev = bp->edev;
 293         struct bnxt_ulp_ops *ops;
 294         int i;
 295
 296         if (!edev)
 297                 return;
 298
 299         edev->flags &= ~BNXT_EN_FLAG_ULP_STOPPED;
 300
 301         if (err)
 302                 return;
 303
 304         for (i = 0; i < BNXT_MAX_ULP; i++) {
 305                 struct bnxt_ulp *ulp = &edev->ulp_tbl[i];
 306
 307                 ops = rtnl_dereference(ulp->ulp_ops);
 308                 if (!ops || !ops->ulp_start)
 309                         continue;
 310                 ops->ulp_start(ulp->handle);
 311         }
 312 }
 313
 314 void bnxt_ulp_sriov_cfg(struct bnxt *bp, int num_vfs)
 315 {
 316         struct bnxt_en_dev *edev = bp->edev;
 317         struct bnxt_ulp_ops *ops;
 318         int i;
 319
 320         if (!edev)
 321                 return;
 322
 323         for (i = 0; i < BNXT_MAX_ULP; i++) {
 324                 struct bnxt_ulp *ulp = &edev->ulp_tbl[i];
 325
 326                 rcu_read_lock();
 327                 ops = rcu_dereference(ulp->ulp_ops);
 328                 if (!ops || !ops->ulp_sriov_config) {
 329                         rcu_read_unlock();
 330                         continue;
 331                 }
 332                 bnxt_ulp_get(ulp);
 333                 rcu_read_unlock();
 334                 ops->ulp_sriov_config(ulp->handle, num_vfs);
 335                 bnxt_ulp_put(ulp);
 336         }
 337 }
 338
 339 void bnxt_ulp_shutdown(struct bnxt *bp)
 340 {
 341         struct bnxt_en_dev *edev = bp->edev;
 342         struct bnxt_ulp_ops *ops;
 343         int i;
 344
 345         if (!edev)
 346                 return;
 347
 348         for (i = 0; i < BNXT_MAX_ULP; i++) {
 349                 struct bnxt_ulp *ulp = &edev->ulp_tbl[i];
 350
 351                 ops = rtnl_dereference(ulp->ulp_ops);
 352                 if (!ops || !ops->ulp_shutdown)
 353                         continue;
 354                 ops->ulp_shutdown(ulp->handle);
 355         }
 356 }
 357
 358 void bnxt_ulp_irq_stop(struct bnxt *bp)
 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
 369                 if (!ulp->msix_requested)
 370                         return;
 371
 372                 ops = rtnl_dereference(ulp->ulp_ops);
 373                 if (!ops || !ops->ulp_irq_stop)
 374                         return;
 375                 ops->ulp_irq_stop(ulp->handle);
 376         }
 377 }
 378
 379 void bnxt_ulp_irq_restart(struct bnxt *bp, int err)
 380 {
 381         struct bnxt_en_dev *edev = bp->edev;
 382         struct bnxt_ulp_ops *ops;
 383
 384         if (!edev || !(edev->flags & BNXT_EN_FLAG_MSIX_REQUESTED))
 385                 return;
 386
 387         if (bnxt_ulp_registered(bp->edev, BNXT_ROCE_ULP)) {
 388                 struct bnxt_ulp *ulp = &edev->ulp_tbl[BNXT_ROCE_ULP];
 389                 struct bnxt_msix_entry *ent = NULL;
 390
 391                 if (!ulp->msix_requested)
 392                         return;
 393
 394                 ops = rtnl_dereference(ulp->ulp_ops);
 395                 if (!ops || !ops->ulp_irq_restart)
 396                         return;
 397
 398                 if (!err) {
 399                         ent = kcalloc(ulp->msix_requested, sizeof(*ent),
 400                                       GFP_KERNEL);
 401                         if (!ent)
 402                                 return;
 403                         bnxt_fill_msix_vecs(bp, ent);
 404                 }
 405                 ops->ulp_irq_restart(ulp->handle, ent);
 406                 kfree(ent);
 407         }
 408 }
 409
 410 void bnxt_ulp_async_events(struct bnxt *bp, struct hwrm_async_event_cmpl *cmpl)
 411 {
 412         u16 event_id = le16_to_cpu(cmpl->event_id);
 413         struct bnxt_en_dev *edev = bp->edev;
 414         struct bnxt_ulp_ops *ops;
 415         int i;
 416
 417         if (!edev)
 418                 return;
 419
 420         rcu_read_lock();
 421         for (i = 0; i < BNXT_MAX_ULP; i++) {
 422                 struct bnxt_ulp *ulp = &edev->ulp_tbl[i];
 423
 424                 ops = rcu_dereference(ulp->ulp_ops);
 425                 if (!ops || !ops->ulp_async_notifier)
 426                         continue;
 427                 if (!ulp->async_events_bmap ||
 428                     event_id > ulp->max_async_event_id)
 429                         continue;
 430
 431                 /* Read max_async_event_id first before testing the bitmap. */
 432                 smp_rmb();
 433                 if (test_bit(event_id, ulp->async_events_bmap))
 434                         ops->ulp_async_notifier(ulp->handle, cmpl);
 435         }
 436         rcu_read_unlock();
 437 }
 438
 439 static int bnxt_register_async_events(struct bnxt_en_dev *edev, int ulp_id,
 440                                       unsigned long *events_bmap, u16 max_id)
 441 {
 442         struct net_device *dev = edev->net;
 443         struct bnxt *bp = netdev_priv(dev);
 444         struct bnxt_ulp *ulp;
 445
 446         if (ulp_id >= BNXT_MAX_ULP)
 447                 return -EINVAL;
 448
 449         ulp = &edev->ulp_tbl[ulp_id];
 450         ulp->async_events_bmap = events_bmap;
 451         /* Make sure bnxt_ulp_async_events() sees this order */
 452         smp_wmb();
 453         ulp->max_async_event_id = max_id;
 454         bnxt_hwrm_func_drv_rgtr(bp, events_bmap, max_id + 1, true);
 455         return 0;
 456 }
 457
 458 static const struct bnxt_en_ops bnxt_en_ops_tbl = {
 459         .bnxt_register_device   = bnxt_register_dev,
 460         .bnxt_unregister_device = bnxt_unregister_dev,
 461         .bnxt_request_msix      = bnxt_req_msix_vecs,
 462         .bnxt_free_msix         = bnxt_free_msix_vecs,
 463         .bnxt_send_fw_msg       = bnxt_send_msg,
 464         .bnxt_register_fw_async_events  = bnxt_register_async_events,
 465 };
 466
 467 struct bnxt_en_dev *bnxt_ulp_probe(struct net_device *dev)
 468 {
 469         struct bnxt *bp = netdev_priv(dev);
 470         struct bnxt_en_dev *edev;
 471
 472         edev = bp->edev;
 473         if (!edev) {
 474                 edev = kzalloc(sizeof(*edev), GFP_KERNEL);
 475                 if (!edev)
 476                         return ERR_PTR(-ENOMEM);
 477                 edev->en_ops = &bnxt_en_ops_tbl;
 478                 if (bp->flags & BNXT_FLAG_ROCEV1_CAP)
 479                         edev->flags |= BNXT_EN_FLAG_ROCEV1_CAP;
 480                 if (bp->flags & BNXT_FLAG_ROCEV2_CAP)
 481                         edev->flags |= BNXT_EN_FLAG_ROCEV2_CAP;
 482                 edev->net = dev;
 483                 edev->pdev = bp->pdev;
 484                 edev->l2_db_size = bp->db_size;
 485                 edev->l2_db_size_nc = bp->db_size;
 486                 bp->edev = edev;
 487         }
 488         return bp->edev;
 489 }