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

   1 /* Broadcom NetXtreme-C/E network driver.
   2  *
   3  * Copyright (c) 2016 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 int bnxt_req_msix_vecs(struct bnxt_en_dev *edev, int ulp_id,
 105                               struct bnxt_msix_entry *ent, int num_msix)
 106 {
 107         struct net_device *dev = edev->net;
 108         struct bnxt *bp = netdev_priv(dev);
 109         int max_idx, max_cp_rings;
 110         int avail_msix, i, idx;
 111         int rc = 0;
 112
 113         ASSERT_RTNL();
 114         if (ulp_id != BNXT_ROCE_ULP)
 115                 return -EINVAL;
 116
 117         if (!(bp->flags & BNXT_FLAG_USING_MSIX))
 118                 return -ENODEV;
 119
 120         if (edev->ulp_tbl[ulp_id].msix_requested)
 121                 return -EAGAIN;
 122
 123         max_cp_rings = bnxt_get_max_func_cp_rings(bp);
 124         avail_msix = bnxt_get_avail_msix(bp, num_msix);
 125         if (!avail_msix)
 126                 return -ENOMEM;
 127         if (avail_msix > num_msix)
 128                 avail_msix = num_msix;
 129
 130         if (bp->flags & BNXT_FLAG_NEW_RM) {
 131                 idx = bp->cp_nr_rings;
 132         } else {
 133                 max_idx = min_t(int, bp->total_irqs, max_cp_rings);
 134                 idx = max_idx - avail_msix;
 135         }
 136         edev->ulp_tbl[ulp_id].msix_base = idx;
 137         edev->ulp_tbl[ulp_id].msix_requested = avail_msix;
 138         if (bp->total_irqs < (idx + avail_msix)) {
 139                 if (netif_running(dev)) {
 140                         bnxt_close_nic(bp, true, false);
 141                         rc = bnxt_open_nic(bp, true, false);
 142                 } else {
 143                         rc = bnxt_reserve_rings(bp);
 144                 }
 145         }
 146         if (rc) {
 147                 edev->ulp_tbl[ulp_id].msix_requested = 0;
 148                 return -EAGAIN;
 149         }
 150
 151         if (bp->flags & BNXT_FLAG_NEW_RM) {
 152                 struct bnxt_hw_resc *hw_resc = &bp->hw_resc;
 153
 154                 avail_msix = hw_resc->resv_cp_rings - bp->cp_nr_rings;
 155                 edev->ulp_tbl[ulp_id].msix_requested = avail_msix;
 156         }
 157         for (i = 0; i < avail_msix; i++) {
 158                 ent[i].vector = bp->irq_tbl[idx + i].vector;
 159                 ent[i].ring_idx = idx + i;
 160                 ent[i].db_offset = (idx + i) * 0x80;
 161         }
 162         bnxt_set_max_func_irqs(bp, bnxt_get_max_func_irqs(bp) - avail_msix);
 163         bnxt_set_max_func_cp_rings(bp, max_cp_rings - avail_msix);
 164         return avail_msix;
 165 }
 166
 167 static int bnxt_free_msix_vecs(struct bnxt_en_dev *edev, int ulp_id)
 168 {
 169         struct net_device *dev = edev->net;
 170         struct bnxt *bp = netdev_priv(dev);
 171         int max_cp_rings, msix_requested;
 172
 173         ASSERT_RTNL();
 174         if (ulp_id != BNXT_ROCE_ULP)
 175                 return -EINVAL;
 176
 177         max_cp_rings = bnxt_get_max_func_cp_rings(bp);
 178         msix_requested = edev->ulp_tbl[ulp_id].msix_requested;
 179         bnxt_set_max_func_cp_rings(bp, max_cp_rings + msix_requested);
 180         edev->ulp_tbl[ulp_id].msix_requested = 0;
 181         bnxt_set_max_func_irqs(bp, bnxt_get_max_func_irqs(bp) + msix_requested);
 182         if (netif_running(dev)) {
 183                 bnxt_close_nic(bp, true, false);
 184                 bnxt_open_nic(bp, true, false);
 185         }
 186         return 0;
 187 }
 188
 189 int bnxt_get_ulp_msix_num(struct bnxt *bp)
 190 {
 191         if (bnxt_ulp_registered(bp->edev, BNXT_ROCE_ULP)) {
 192                 struct bnxt_en_dev *edev = bp->edev;
 193
 194                 return edev->ulp_tbl[BNXT_ROCE_ULP].msix_requested;
 195         }
 196         return 0;
 197 }
 198
 199 int bnxt_get_ulp_msix_base(struct bnxt *bp)
 200 {
 201         if (bnxt_ulp_registered(bp->edev, BNXT_ROCE_ULP)) {
 202                 struct bnxt_en_dev *edev = bp->edev;
 203
 204                 if (edev->ulp_tbl[BNXT_ROCE_ULP].msix_requested)
 205                         return edev->ulp_tbl[BNXT_ROCE_ULP].msix_base;
 206         }
 207         return 0;
 208 }
 209
 210 void bnxt_subtract_ulp_resources(struct bnxt *bp, int ulp_id)
 211 {
 212         ASSERT_RTNL();
 213         if (bnxt_ulp_registered(bp->edev, ulp_id)) {
 214                 struct bnxt_en_dev *edev = bp->edev;
 215                 unsigned int msix_req, max;
 216
 217                 msix_req = edev->ulp_tbl[ulp_id].msix_requested;
 218                 max = bnxt_get_max_func_cp_rings(bp);
 219                 bnxt_set_max_func_cp_rings(bp, max - msix_req);
 220                 max = bnxt_get_max_func_stat_ctxs(bp);
 221                 bnxt_set_max_func_stat_ctxs(bp, max - 1);
 222         }
 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         mutex_lock(&bp->hwrm_cmd_lock);
 234         req = fw_msg->msg;
 235         req->resp_addr = cpu_to_le64(bp->hwrm_cmd_resp_dma_addr);
 236         rc = _hwrm_send_message(bp, fw_msg->msg, fw_msg->msg_len,
 237                                 fw_msg->timeout);
 238         if (!rc) {
 239                 struct output *resp = bp->hwrm_cmd_resp_addr;
 240                 u32 len = le16_to_cpu(resp->resp_len);
 241
 242                 if (fw_msg->resp_max_len < len)
 243                         len = fw_msg->resp_max_len;
 244
 245                 memcpy(fw_msg->resp, resp, len);
 246         }
 247         mutex_unlock(&bp->hwrm_cmd_lock);
 248         return rc;
 249 }
 250
 251 static void bnxt_ulp_get(struct bnxt_ulp *ulp)
 252 {
 253         atomic_inc(&ulp->ref_count);
 254 }
 255
 256 static void bnxt_ulp_put(struct bnxt_ulp *ulp)
 257 {
 258         atomic_dec(&ulp->ref_count);
 259 }
 260
 261 void bnxt_ulp_stop(struct bnxt *bp)
 262 {
 263         struct bnxt_en_dev *edev = bp->edev;
 264         struct bnxt_ulp_ops *ops;
 265         int i;
 266
 267         if (!edev)
 268                 return;
 269
 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)
 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         for (i = 0; i < BNXT_MAX_ULP; i++) {
 290                 struct bnxt_ulp *ulp = &edev->ulp_tbl[i];
 291
 292                 ops = rtnl_dereference(ulp->ulp_ops);
 293                 if (!ops || !ops->ulp_start)
 294                         continue;
 295                 ops->ulp_start(ulp->handle);
 296         }
 297 }
 298
 299 void bnxt_ulp_sriov_cfg(struct bnxt *bp, int num_vfs)
 300 {
 301         struct bnxt_en_dev *edev = bp->edev;
 302         struct bnxt_ulp_ops *ops;
 303         int i;
 304
 305         if (!edev)
 306                 return;
 307
 308         for (i = 0; i < BNXT_MAX_ULP; i++) {
 309                 struct bnxt_ulp *ulp = &edev->ulp_tbl[i];
 310
 311                 rcu_read_lock();
 312                 ops = rcu_dereference(ulp->ulp_ops);
 313                 if (!ops || !ops->ulp_sriov_config) {
 314                         rcu_read_unlock();
 315                         continue;
 316                 }
 317                 bnxt_ulp_get(ulp);
 318                 rcu_read_unlock();
 319                 ops->ulp_sriov_config(ulp->handle, num_vfs);
 320                 bnxt_ulp_put(ulp);
 321         }
 322 }
 323
 324 void bnxt_ulp_shutdown(struct bnxt *bp)
 325 {
 326         struct bnxt_en_dev *edev = bp->edev;
 327         struct bnxt_ulp_ops *ops;
 328         int i;
 329
 330         if (!edev)
 331                 return;
 332
 333         for (i = 0; i < BNXT_MAX_ULP; i++) {
 334                 struct bnxt_ulp *ulp = &edev->ulp_tbl[i];
 335
 336                 ops = rtnl_dereference(ulp->ulp_ops);
 337                 if (!ops || !ops->ulp_shutdown)
 338                         continue;
 339                 ops->ulp_shutdown(ulp->handle);
 340         }
 341 }
 342
 343 void bnxt_ulp_async_events(struct bnxt *bp, struct hwrm_async_event_cmpl *cmpl)
 344 {
 345         u16 event_id = le16_to_cpu(cmpl->event_id);
 346         struct bnxt_en_dev *edev = bp->edev;
 347         struct bnxt_ulp_ops *ops;
 348         int i;
 349
 350         if (!edev)
 351                 return;
 352
 353         rcu_read_lock();
 354         for (i = 0; i < BNXT_MAX_ULP; i++) {
 355                 struct bnxt_ulp *ulp = &edev->ulp_tbl[i];
 356
 357                 ops = rcu_dereference(ulp->ulp_ops);
 358                 if (!ops || !ops->ulp_async_notifier)
 359                         continue;
 360                 if (!ulp->async_events_bmap ||
 361                     event_id > ulp->max_async_event_id)
 362                         continue;
 363
 364                 /* Read max_async_event_id first before testing the bitmap. */
 365                 smp_rmb();
 366                 if (test_bit(event_id, ulp->async_events_bmap))
 367                         ops->ulp_async_notifier(ulp->handle, cmpl);
 368         }
 369         rcu_read_unlock();
 370 }
 371
 372 static int bnxt_register_async_events(struct bnxt_en_dev *edev, int ulp_id,
 373                                       unsigned long *events_bmap, u16 max_id)
 374 {
 375         struct net_device *dev = edev->net;
 376         struct bnxt *bp = netdev_priv(dev);
 377         struct bnxt_ulp *ulp;
 378
 379         if (ulp_id >= BNXT_MAX_ULP)
 380                 return -EINVAL;
 381
 382         ulp = &edev->ulp_tbl[ulp_id];
 383         ulp->async_events_bmap = events_bmap;
 384         /* Make sure bnxt_ulp_async_events() sees this order */
 385         smp_wmb();
 386         ulp->max_async_event_id = max_id;
 387         bnxt_hwrm_func_rgtr_async_events(bp, events_bmap, max_id + 1);
 388         return 0;
 389 }
 390
 391 static const struct bnxt_en_ops bnxt_en_ops_tbl = {
 392         .bnxt_register_device   = bnxt_register_dev,
 393         .bnxt_unregister_device = bnxt_unregister_dev,
 394         .bnxt_request_msix      = bnxt_req_msix_vecs,
 395         .bnxt_free_msix         = bnxt_free_msix_vecs,
 396         .bnxt_send_fw_msg       = bnxt_send_msg,
 397         .bnxt_register_fw_async_events  = bnxt_register_async_events,
 398 };
 399
 400 struct bnxt_en_dev *bnxt_ulp_probe(struct net_device *dev)
 401 {
 402         struct bnxt *bp = netdev_priv(dev);
 403         struct bnxt_en_dev *edev;
 404
 405         edev = bp->edev;
 406         if (!edev) {
 407                 edev = kzalloc(sizeof(*edev), GFP_KERNEL);
 408                 if (!edev)
 409                         return ERR_PTR(-ENOMEM);
 410                 edev->en_ops = &bnxt_en_ops_tbl;
 411                 if (bp->flags & BNXT_FLAG_ROCEV1_CAP)
 412                         edev->flags |= BNXT_EN_FLAG_ROCEV1_CAP;
 413                 if (bp->flags & BNXT_FLAG_ROCEV2_CAP)
 414                         edev->flags |= BNXT_EN_FLAG_ROCEV2_CAP;
 415                 edev->net = dev;
 416                 edev->pdev = bp->pdev;
 417                 bp->edev = edev;
 418         }
 419         return bp->edev;
 420 }