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