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
 112         ASSERT_RTNL();
 113         if (ulp_id != BNXT_ROCE_ULP)
 114                 return -EINVAL;
 115
 116         if (!(bp->flags & BNXT_FLAG_USING_MSIX))
 117                 return -ENODEV;
 118
 119         max_cp_rings = bnxt_get_max_func_cp_rings(bp);
 120         max_idx = min_t(int, bp->total_irqs, max_cp_rings);
 121         avail_msix = max_idx - bp->cp_nr_rings;
 122         if (!avail_msix)
 123                 return -ENOMEM;
 124         if (avail_msix > num_msix)
 125                 avail_msix = num_msix;
 126
 127         idx = max_idx - avail_msix;
 128         for (i = 0; i < avail_msix; i++) {
 129                 ent[i].vector = bp->irq_tbl[idx + i].vector;
 130                 ent[i].ring_idx = idx + i;
 131                 ent[i].db_offset = (idx + i) * 0x80;
 132         }
 133         bnxt_set_max_func_irqs(bp, max_idx - avail_msix);
 134         bnxt_set_max_func_cp_rings(bp, max_cp_rings - avail_msix);
 135         edev->ulp_tbl[ulp_id].msix_requested = avail_msix;
 136         return avail_msix;
 137 }
 138
 139 static int bnxt_free_msix_vecs(struct bnxt_en_dev *edev, int ulp_id)
 140 {
 141         struct net_device *dev = edev->net;
 142         struct bnxt *bp = netdev_priv(dev);
 143         int max_cp_rings, msix_requested;
 144
 145         ASSERT_RTNL();
 146         if (ulp_id != BNXT_ROCE_ULP)
 147                 return -EINVAL;
 148
 149         max_cp_rings = bnxt_get_max_func_cp_rings(bp);
 150         msix_requested = edev->ulp_tbl[ulp_id].msix_requested;
 151         bnxt_set_max_func_cp_rings(bp, max_cp_rings + msix_requested);
 152         edev->ulp_tbl[ulp_id].msix_requested = 0;
 153         bnxt_set_max_func_irqs(bp, bp->total_irqs);
 154         return 0;
 155 }
 156
 157 void bnxt_subtract_ulp_resources(struct bnxt *bp, int ulp_id)
 158 {
 159         ASSERT_RTNL();
 160         if (bnxt_ulp_registered(bp->edev, ulp_id)) {
 161                 struct bnxt_en_dev *edev = bp->edev;
 162                 unsigned int msix_req, max;
 163
 164                 msix_req = edev->ulp_tbl[ulp_id].msix_requested;
 165                 max = bnxt_get_max_func_cp_rings(bp);
 166                 bnxt_set_max_func_cp_rings(bp, max - msix_req);
 167                 max = bnxt_get_max_func_stat_ctxs(bp);
 168                 bnxt_set_max_func_stat_ctxs(bp, max - 1);
 169         }
 170 }
 171
 172 static int bnxt_send_msg(struct bnxt_en_dev *edev, int ulp_id,
 173                          struct bnxt_fw_msg *fw_msg)
 174 {
 175         struct net_device *dev = edev->net;
 176         struct bnxt *bp = netdev_priv(dev);
 177         struct input *req;
 178         int rc;
 179
 180         mutex_lock(&bp->hwrm_cmd_lock);
 181         req = fw_msg->msg;
 182         req->resp_addr = cpu_to_le64(bp->hwrm_cmd_resp_dma_addr);
 183         rc = _hwrm_send_message(bp, fw_msg->msg, fw_msg->msg_len,
 184                                 fw_msg->timeout);
 185         if (!rc) {
 186                 struct output *resp = bp->hwrm_cmd_resp_addr;
 187                 u32 len = le16_to_cpu(resp->resp_len);
 188
 189                 if (fw_msg->resp_max_len < len)
 190                         len = fw_msg->resp_max_len;
 191
 192                 memcpy(fw_msg->resp, resp, len);
 193         }
 194         mutex_unlock(&bp->hwrm_cmd_lock);
 195         return rc;
 196 }
 197
 198 static void bnxt_ulp_get(struct bnxt_ulp *ulp)
 199 {
 200         atomic_inc(&ulp->ref_count);
 201 }
 202
 203 static void bnxt_ulp_put(struct bnxt_ulp *ulp)
 204 {
 205         atomic_dec(&ulp->ref_count);
 206 }
 207
 208 void bnxt_ulp_stop(struct bnxt *bp)
 209 {
 210         struct bnxt_en_dev *edev = bp->edev;
 211         struct bnxt_ulp_ops *ops;
 212         int i;
 213
 214         if (!edev)
 215                 return;
 216
 217         for (i = 0; i < BNXT_MAX_ULP; i++) {
 218                 struct bnxt_ulp *ulp = &edev->ulp_tbl[i];
 219
 220                 ops = rtnl_dereference(ulp->ulp_ops);
 221                 if (!ops || !ops->ulp_stop)
 222                         continue;
 223                 ops->ulp_stop(ulp->handle);
 224         }
 225 }
 226
 227 void bnxt_ulp_start(struct bnxt *bp)
 228 {
 229         struct bnxt_en_dev *edev = bp->edev;
 230         struct bnxt_ulp_ops *ops;
 231         int i;
 232
 233         if (!edev)
 234                 return;
 235
 236         for (i = 0; i < BNXT_MAX_ULP; i++) {
 237                 struct bnxt_ulp *ulp = &edev->ulp_tbl[i];
 238
 239                 ops = rtnl_dereference(ulp->ulp_ops);
 240                 if (!ops || !ops->ulp_start)
 241                         continue;
 242                 ops->ulp_start(ulp->handle);
 243         }
 244 }
 245
 246 void bnxt_ulp_sriov_cfg(struct bnxt *bp, int num_vfs)
 247 {
 248         struct bnxt_en_dev *edev = bp->edev;
 249         struct bnxt_ulp_ops *ops;
 250         int i;
 251
 252         if (!edev)
 253                 return;
 254
 255         for (i = 0; i < BNXT_MAX_ULP; i++) {
 256                 struct bnxt_ulp *ulp = &edev->ulp_tbl[i];
 257
 258                 rcu_read_lock();
 259                 ops = rcu_dereference(ulp->ulp_ops);
 260                 if (!ops || !ops->ulp_sriov_config) {
 261                         rcu_read_unlock();
 262                         continue;
 263                 }
 264                 bnxt_ulp_get(ulp);
 265                 rcu_read_unlock();
 266                 ops->ulp_sriov_config(ulp->handle, num_vfs);
 267                 bnxt_ulp_put(ulp);
 268         }
 269 }
 270
 271 void bnxt_ulp_shutdown(struct bnxt *bp)
 272 {
 273         struct bnxt_en_dev *edev = bp->edev;
 274         struct bnxt_ulp_ops *ops;
 275         int i;
 276
 277         if (!edev)
 278                 return;
 279
 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_shutdown)
 285                         continue;
 286                 ops->ulp_shutdown(ulp->handle);
 287         }
 288 }
 289
 290 void bnxt_ulp_async_events(struct bnxt *bp, struct hwrm_async_event_cmpl *cmpl)
 291 {
 292         u16 event_id = le16_to_cpu(cmpl->event_id);
 293         struct bnxt_en_dev *edev = bp->edev;
 294         struct bnxt_ulp_ops *ops;
 295         int i;
 296
 297         if (!edev)
 298                 return;
 299
 300         rcu_read_lock();
 301         for (i = 0; i < BNXT_MAX_ULP; i++) {
 302                 struct bnxt_ulp *ulp = &edev->ulp_tbl[i];
 303
 304                 ops = rcu_dereference(ulp->ulp_ops);
 305                 if (!ops || !ops->ulp_async_notifier)
 306                         continue;
 307                 if (!ulp->async_events_bmap ||
 308                     event_id > ulp->max_async_event_id)
 309                         continue;
 310
 311                 /* Read max_async_event_id first before testing the bitmap. */
 312                 smp_rmb();
 313                 if (test_bit(event_id, ulp->async_events_bmap))
 314                         ops->ulp_async_notifier(ulp->handle, cmpl);
 315         }
 316         rcu_read_unlock();
 317 }
 318
 319 static int bnxt_register_async_events(struct bnxt_en_dev *edev, int ulp_id,
 320                                       unsigned long *events_bmap, u16 max_id)
 321 {
 322         struct net_device *dev = edev->net;
 323         struct bnxt *bp = netdev_priv(dev);
 324         struct bnxt_ulp *ulp;
 325
 326         if (ulp_id >= BNXT_MAX_ULP)
 327                 return -EINVAL;
 328
 329         ulp = &edev->ulp_tbl[ulp_id];
 330         ulp->async_events_bmap = events_bmap;
 331         /* Make sure bnxt_ulp_async_events() sees this order */
 332         smp_wmb();
 333         ulp->max_async_event_id = max_id;
 334         bnxt_hwrm_func_rgtr_async_events(bp, events_bmap, max_id + 1);
 335         return 0;
 336 }
 337
 338 static const struct bnxt_en_ops bnxt_en_ops_tbl = {
 339         .bnxt_register_device   = bnxt_register_dev,
 340         .bnxt_unregister_device = bnxt_unregister_dev,
 341         .bnxt_request_msix      = bnxt_req_msix_vecs,
 342         .bnxt_free_msix         = bnxt_free_msix_vecs,
 343         .bnxt_send_fw_msg       = bnxt_send_msg,
 344         .bnxt_register_fw_async_events  = bnxt_register_async_events,
 345 };
 346
 347 struct bnxt_en_dev *bnxt_ulp_probe(struct net_device *dev)
 348 {
 349         struct bnxt *bp = netdev_priv(dev);
 350         struct bnxt_en_dev *edev;
 351
 352         edev = bp->edev;
 353         if (!edev) {
 354                 edev = kzalloc(sizeof(*edev), GFP_KERNEL);
 355                 if (!edev)
 356                         return ERR_PTR(-ENOMEM);
 357                 edev->en_ops = &bnxt_en_ops_tbl;
 358                 if (bp->flags & BNXT_FLAG_ROCEV1_CAP)
 359                         edev->flags |= BNXT_EN_FLAG_ROCEV1_CAP;
 360                 if (bp->flags & BNXT_FLAG_ROCEV2_CAP)
 361                         edev->flags |= BNXT_EN_FLAG_ROCEV2_CAP;
 362                 edev->net = dev;
 363                 edev->pdev = bp->pdev;
 364                 bp->edev = edev;
 365         }
 366         return bp->edev;
 367 }