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