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

   1 /* Broadcom NetXtreme-C/E network driver.
   2  *
   3  * Copyright (c) 2016-2017 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 #include <linux/pci.h>
  10 #include <linux/netdevice.h>
  11 #include <linux/etherdevice.h>
  12 #include <linux/rtnetlink.h>
  13 #include <linux/jhash.h>
  14 #include <net/pkt_cls.h>
  15
  16 #include "bnxt_hsi.h"
  17 #include "bnxt.h"
  18 #include "bnxt_vfr.h"
  19 #include "bnxt_devlink.h"
  20 #include "bnxt_tc.h"
  21
  22 #ifdef CONFIG_BNXT_SRIOV
  23
  24 #define CFA_HANDLE_INVALID              0xffff
  25 #define VF_IDX_INVALID                  0xffff
  26
  27 static int hwrm_cfa_vfr_alloc(struct bnxt *bp, u16 vf_idx,
  28                               u16 *tx_cfa_action, u16 *rx_cfa_code)
  29 {
  30         struct hwrm_cfa_vfr_alloc_output *resp = bp->hwrm_cmd_resp_addr;
  31         struct hwrm_cfa_vfr_alloc_input req = { 0 };
  32         int rc;
  33
  34         bnxt_hwrm_cmd_hdr_init(bp, &req, HWRM_CFA_VFR_ALLOC, -1, -1);
  35         req.vf_id = cpu_to_le16(vf_idx);
  36         sprintf(req.vfr_name, "vfr%d", vf_idx);
  37
  38         mutex_lock(&bp->hwrm_cmd_lock);
  39         rc = _hwrm_send_message(bp, &req, sizeof(req), HWRM_CMD_TIMEOUT);
  40         if (!rc) {
  41                 *tx_cfa_action = le16_to_cpu(resp->tx_cfa_action);
  42                 *rx_cfa_code = le16_to_cpu(resp->rx_cfa_code);
  43                 netdev_dbg(bp->dev, "tx_cfa_action=0x%x, rx_cfa_code=0x%x",
  44                            *tx_cfa_action, *rx_cfa_code);
  45         } else {
  46                 netdev_info(bp->dev, "%s error rc=%d", __func__, rc);
  47         }
  48
  49         mutex_unlock(&bp->hwrm_cmd_lock);
  50         return rc;
  51 }
  52
  53 static int hwrm_cfa_vfr_free(struct bnxt *bp, u16 vf_idx)
  54 {
  55         struct hwrm_cfa_vfr_free_input req = { 0 };
  56         int rc;
  57
  58         bnxt_hwrm_cmd_hdr_init(bp, &req, HWRM_CFA_VFR_FREE, -1, -1);
  59         sprintf(req.vfr_name, "vfr%d", vf_idx);
  60
  61         rc = hwrm_send_message(bp, &req, sizeof(req), HWRM_CMD_TIMEOUT);
  62         if (rc)
  63                 netdev_info(bp->dev, "%s error rc=%d", __func__, rc);
  64         return rc;
  65 }
  66
  67 static int bnxt_hwrm_vfr_qcfg(struct bnxt *bp, struct bnxt_vf_rep *vf_rep,
  68                               u16 *max_mtu)
  69 {
  70         struct hwrm_func_qcfg_output *resp = bp->hwrm_cmd_resp_addr;
  71         struct hwrm_func_qcfg_input req = {0};
  72         u16 mtu;
  73         int rc;
  74
  75         bnxt_hwrm_cmd_hdr_init(bp, &req, HWRM_FUNC_QCFG, -1, -1);
  76         req.fid = cpu_to_le16(bp->pf.vf[vf_rep->vf_idx].fw_fid);
  77
  78         mutex_lock(&bp->hwrm_cmd_lock);
  79
  80         rc = _hwrm_send_message(bp, &req, sizeof(req), HWRM_CMD_TIMEOUT);
  81         if (!rc) {
  82                 mtu = le16_to_cpu(resp->max_mtu_configured);
  83                 if (!mtu)
  84                         *max_mtu = BNXT_MAX_MTU;
  85                 else
  86                         *max_mtu = mtu;
  87         }
  88         mutex_unlock(&bp->hwrm_cmd_lock);
  89         return rc;
  90 }
  91
  92 static int bnxt_vf_rep_open(struct net_device *dev)
  93 {
  94         struct bnxt_vf_rep *vf_rep = netdev_priv(dev);
  95         struct bnxt *bp = vf_rep->bp;
  96
  97         /* Enable link and TX only if the parent PF is open. */
  98         if (netif_running(bp->dev)) {
  99                 netif_carrier_on(dev);
 100                 netif_tx_start_all_queues(dev);
 101         }
 102         return 0;
 103 }
 104
 105 static int bnxt_vf_rep_close(struct net_device *dev)
 106 {
 107         netif_carrier_off(dev);
 108         netif_tx_disable(dev);
 109
 110         return 0;
 111 }
 112
 113 static netdev_tx_t bnxt_vf_rep_xmit(struct sk_buff *skb,
 114                                     struct net_device *dev)
 115 {
 116         struct bnxt_vf_rep *vf_rep = netdev_priv(dev);
 117         int rc, len = skb->len;
 118
 119         skb_dst_drop(skb);
 120         dst_hold((struct dst_entry *)vf_rep->dst);
 121         skb_dst_set(skb, (struct dst_entry *)vf_rep->dst);
 122         skb->dev = vf_rep->dst->u.port_info.lower_dev;
 123
 124         rc = dev_queue_xmit(skb);
 125         if (!rc) {
 126                 vf_rep->tx_stats.packets++;
 127                 vf_rep->tx_stats.bytes += len;
 128         }
 129         return rc;
 130 }
 131
 132 static void
 133 bnxt_vf_rep_get_stats64(struct net_device *dev,
 134                         struct rtnl_link_stats64 *stats)
 135 {
 136         struct bnxt_vf_rep *vf_rep = netdev_priv(dev);
 137
 138         stats->rx_packets = vf_rep->rx_stats.packets;
 139         stats->rx_bytes = vf_rep->rx_stats.bytes;
 140         stats->tx_packets = vf_rep->tx_stats.packets;
 141         stats->tx_bytes = vf_rep->tx_stats.bytes;
 142 }
 143
 144 static int bnxt_vf_rep_setup_tc_block_cb(enum tc_setup_type type,
 145                                          void *type_data,
 146                                          void *cb_priv)
 147 {
 148         struct bnxt_vf_rep *vf_rep = cb_priv;
 149         struct bnxt *bp = vf_rep->bp;
 150         int vf_fid = bp->pf.vf[vf_rep->vf_idx].fw_fid;
 151
 152         if (!bnxt_tc_flower_enabled(vf_rep->bp) ||
 153             !tc_cls_can_offload_and_chain0(bp->dev, type_data))
 154                 return -EOPNOTSUPP;
 155
 156         switch (type) {
 157         case TC_SETUP_CLSFLOWER:
 158                 return bnxt_tc_setup_flower(bp, vf_fid, type_data);
 159         default:
 160                 return -EOPNOTSUPP;
 161         }
 162 }
 163
 164 static int bnxt_vf_rep_setup_tc_block(struct net_device *dev,
 165                                       struct tc_block_offload *f)
 166 {
 167         struct bnxt_vf_rep *vf_rep = netdev_priv(dev);
 168
 169         if (f->binder_type != TCF_BLOCK_BINDER_TYPE_CLSACT_INGRESS)
 170                 return -EOPNOTSUPP;
 171
 172         switch (f->command) {
 173         case TC_BLOCK_BIND:
 174                 return tcf_block_cb_register(f->block,
 175                                              bnxt_vf_rep_setup_tc_block_cb,
 176                                              vf_rep, vf_rep);
 177         case TC_BLOCK_UNBIND:
 178                 tcf_block_cb_unregister(f->block,
 179                                         bnxt_vf_rep_setup_tc_block_cb, vf_rep);
 180                 return 0;
 181         default:
 182                 return -EOPNOTSUPP;
 183         }
 184 }
 185
 186 static int bnxt_vf_rep_setup_tc(struct net_device *dev, enum tc_setup_type type,
 187                                 void *type_data)
 188 {
 189         switch (type) {
 190         case TC_SETUP_BLOCK:
 191                 return bnxt_vf_rep_setup_tc_block(dev, type_data);
 192         default:
 193                 return -EOPNOTSUPP;
 194         }
 195 }
 196
 197 struct net_device *bnxt_get_vf_rep(struct bnxt *bp, u16 cfa_code)
 198 {
 199         u16 vf_idx;
 200
 201         if (cfa_code && bp->cfa_code_map && BNXT_PF(bp)) {
 202                 vf_idx = bp->cfa_code_map[cfa_code];
 203                 if (vf_idx != VF_IDX_INVALID)
 204                         return bp->vf_reps[vf_idx]->dev;
 205         }
 206         return NULL;
 207 }
 208
 209 void bnxt_vf_rep_rx(struct bnxt *bp, struct sk_buff *skb)
 210 {
 211         struct bnxt_vf_rep *vf_rep = netdev_priv(skb->dev);
 212         struct bnxt_vf_rep_stats *rx_stats;
 213
 214         rx_stats = &vf_rep->rx_stats;
 215         vf_rep->rx_stats.bytes += skb->len;
 216         vf_rep->rx_stats.packets++;
 217
 218         netif_receive_skb(skb);
 219 }
 220
 221 static int bnxt_vf_rep_get_phys_port_name(struct net_device *dev, char *buf,
 222                                           size_t len)
 223 {
 224         struct bnxt_vf_rep *vf_rep = netdev_priv(dev);
 225         struct pci_dev *pf_pdev = vf_rep->bp->pdev;
 226         int rc;
 227
 228         rc = snprintf(buf, len, "pf%dvf%d", PCI_FUNC(pf_pdev->devfn),
 229                       vf_rep->vf_idx);
 230         if (rc >= len)
 231                 return -EOPNOTSUPP;
 232         return 0;
 233 }
 234
 235 static void bnxt_vf_rep_get_drvinfo(struct net_device *dev,
 236                                     struct ethtool_drvinfo *info)
 237 {
 238         strlcpy(info->driver, DRV_MODULE_NAME, sizeof(info->driver));
 239         strlcpy(info->version, DRV_MODULE_VERSION, sizeof(info->version));
 240 }
 241
 242 static int bnxt_vf_rep_port_attr_get(struct net_device *dev,
 243                                      struct switchdev_attr *attr)
 244 {
 245         struct bnxt_vf_rep *vf_rep = netdev_priv(dev);
 246
 247         /* as only PORT_PARENT_ID is supported currently use common code
 248          * between PF and VF-rep for now.
 249          */
 250         return bnxt_port_attr_get(vf_rep->bp, attr);
 251 }
 252
 253 static const struct switchdev_ops bnxt_vf_rep_switchdev_ops = {
 254         .switchdev_port_attr_get        = bnxt_vf_rep_port_attr_get
 255 };
 256
 257 static const struct ethtool_ops bnxt_vf_rep_ethtool_ops = {
 258         .get_drvinfo            = bnxt_vf_rep_get_drvinfo
 259 };
 260
 261 static const struct net_device_ops bnxt_vf_rep_netdev_ops = {
 262         .ndo_open               = bnxt_vf_rep_open,
 263         .ndo_stop               = bnxt_vf_rep_close,
 264         .ndo_start_xmit         = bnxt_vf_rep_xmit,
 265         .ndo_get_stats64        = bnxt_vf_rep_get_stats64,
 266         .ndo_setup_tc           = bnxt_vf_rep_setup_tc,
 267         .ndo_get_phys_port_name = bnxt_vf_rep_get_phys_port_name
 268 };
 269
 270 bool bnxt_dev_is_vf_rep(struct net_device *dev)
 271 {
 272         return dev->netdev_ops == &bnxt_vf_rep_netdev_ops;
 273 }
 274
 275 /* Called when the parent PF interface is closed:
 276  * As the mode transition from SWITCHDEV to LEGACY
 277  * happens under the rtnl_lock() this routine is safe
 278  * under the rtnl_lock()
 279  */
 280 void bnxt_vf_reps_close(struct bnxt *bp)
 281 {
 282         struct bnxt_vf_rep *vf_rep;
 283         u16 num_vfs, i;
 284
 285         if (bp->eswitch_mode != DEVLINK_ESWITCH_MODE_SWITCHDEV)
 286                 return;
 287
 288         num_vfs = pci_num_vf(bp->pdev);
 289         for (i = 0; i < num_vfs; i++) {
 290                 vf_rep = bp->vf_reps[i];
 291                 if (netif_running(vf_rep->dev))
 292                         bnxt_vf_rep_close(vf_rep->dev);
 293         }
 294 }
 295
 296 /* Called when the parent PF interface is opened (re-opened):
 297  * As the mode transition from SWITCHDEV to LEGACY
 298  * happen under the rtnl_lock() this routine is safe
 299  * under the rtnl_lock()
 300  */
 301 void bnxt_vf_reps_open(struct bnxt *bp)
 302 {
 303         int i;
 304
 305         if (bp->eswitch_mode != DEVLINK_ESWITCH_MODE_SWITCHDEV)
 306                 return;
 307
 308         for (i = 0; i < pci_num_vf(bp->pdev); i++)
 309                 bnxt_vf_rep_open(bp->vf_reps[i]->dev);
 310 }
 311
 312 static void __bnxt_vf_reps_destroy(struct bnxt *bp)
 313 {
 314         u16 num_vfs = pci_num_vf(bp->pdev);
 315         struct bnxt_vf_rep *vf_rep;
 316         int i;
 317
 318         for (i = 0; i < num_vfs; i++) {
 319                 vf_rep = bp->vf_reps[i];
 320                 if (vf_rep) {
 321                         dst_release((struct dst_entry *)vf_rep->dst);
 322
 323                         if (vf_rep->tx_cfa_action != CFA_HANDLE_INVALID)
 324                                 hwrm_cfa_vfr_free(bp, vf_rep->vf_idx);
 325
 326                         if (vf_rep->dev) {
 327                                 /* if register_netdev failed, then netdev_ops
 328                                  * would have been set to NULL
 329                                  */
 330                                 if (vf_rep->dev->netdev_ops)
 331                                         unregister_netdev(vf_rep->dev);
 332                                 free_netdev(vf_rep->dev);
 333                         }
 334                 }
 335         }
 336
 337         kfree(bp->vf_reps);
 338         bp->vf_reps = NULL;
 339 }
 340
 341 void bnxt_vf_reps_destroy(struct bnxt *bp)
 342 {
 343         bool closed = false;
 344
 345         if (bp->eswitch_mode != DEVLINK_ESWITCH_MODE_SWITCHDEV)
 346                 return;
 347
 348         if (!bp->vf_reps)
 349                 return;
 350
 351         /* Ensure that parent PF's and VF-reps' RX/TX has been quiesced
 352          * before proceeding with VF-rep cleanup.
 353          */
 354         rtnl_lock();
 355         if (netif_running(bp->dev)) {
 356                 bnxt_close_nic(bp, false, false);
 357                 closed = true;
 358         }
 359         /* un-publish cfa_code_map so that RX path can't see it anymore */
 360         kfree(bp->cfa_code_map);
 361         bp->cfa_code_map = NULL;
 362         bp->eswitch_mode = DEVLINK_ESWITCH_MODE_LEGACY;
 363
 364         if (closed)
 365                 bnxt_open_nic(bp, false, false);
 366         rtnl_unlock();
 367
 368         /* Need to call vf_reps_destroy() outside of rntl_lock
 369          * as unregister_netdev takes rtnl_lock
 370          */
 371         __bnxt_vf_reps_destroy(bp);
 372 }
 373
 374 /* Use the OUI of the PF's perm addr and report the same mac addr
 375  * for the same VF-rep each time
 376  */
 377 static void bnxt_vf_rep_eth_addr_gen(u8 *src_mac, u16 vf_idx, u8 *mac)
 378 {
 379         u32 addr;
 380
 381         ether_addr_copy(mac, src_mac);
 382
 383         addr = jhash(src_mac, ETH_ALEN, 0) + vf_idx;
 384         mac[3] = (u8)(addr & 0xFF);
 385         mac[4] = (u8)((addr >> 8) & 0xFF);
 386         mac[5] = (u8)((addr >> 16) & 0xFF);
 387 }
 388
 389 static void bnxt_vf_rep_netdev_init(struct bnxt *bp, struct bnxt_vf_rep *vf_rep,
 390                                     struct net_device *dev)
 391 {
 392         struct net_device *pf_dev = bp->dev;
 393         u16 max_mtu;
 394
 395         dev->netdev_ops = &bnxt_vf_rep_netdev_ops;
 396         dev->ethtool_ops = &bnxt_vf_rep_ethtool_ops;
 397         SWITCHDEV_SET_OPS(dev, &bnxt_vf_rep_switchdev_ops);
 398         /* Just inherit all the featues of the parent PF as the VF-R
 399          * uses the RX/TX rings of the parent PF
 400          */
 401         dev->hw_features = pf_dev->hw_features;
 402         dev->gso_partial_features = pf_dev->gso_partial_features;
 403         dev->vlan_features = pf_dev->vlan_features;
 404         dev->hw_enc_features = pf_dev->hw_enc_features;
 405         dev->features |= pf_dev->features;
 406         bnxt_vf_rep_eth_addr_gen(bp->pf.mac_addr, vf_rep->vf_idx,
 407                                  dev->perm_addr);
 408         ether_addr_copy(dev->dev_addr, dev->perm_addr);
 409         /* Set VF-Rep's max-mtu to the corresponding VF's max-mtu */
 410         if (!bnxt_hwrm_vfr_qcfg(bp, vf_rep, &max_mtu))
 411                 dev->max_mtu = max_mtu;
 412         dev->min_mtu = ETH_ZLEN;
 413 }
 414
 415 static int bnxt_pcie_dsn_get(struct bnxt *bp, u8 dsn[])
 416 {
 417         struct pci_dev *pdev = bp->pdev;
 418         int pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_DSN);
 419         u32 dw;
 420
 421         if (!pos) {
 422                 netdev_info(bp->dev, "Unable do read adapter's DSN");
 423                 return -EOPNOTSUPP;
 424         }
 425
 426         /* DSN (two dw) is at an offset of 4 from the cap pos */
 427         pos += 4;
 428         pci_read_config_dword(pdev, pos, &dw);
 429         put_unaligned_le32(dw, &dsn[0]);
 430         pci_read_config_dword(pdev, pos + 4, &dw);
 431         put_unaligned_le32(dw, &dsn[4]);
 432         return 0;
 433 }
 434
 435 static int bnxt_vf_reps_create(struct bnxt *bp)
 436 {
 437         u16 *cfa_code_map = NULL, num_vfs = pci_num_vf(bp->pdev);
 438         struct bnxt_vf_rep *vf_rep;
 439         struct net_device *dev;
 440         int rc, i;
 441
 442         bp->vf_reps = kcalloc(num_vfs, sizeof(vf_rep), GFP_KERNEL);
 443         if (!bp->vf_reps)
 444                 return -ENOMEM;
 445
 446         /* storage for cfa_code to vf-idx mapping */
 447         cfa_code_map = kmalloc_array(MAX_CFA_CODE, sizeof(*bp->cfa_code_map),
 448                                      GFP_KERNEL);
 449         if (!cfa_code_map) {
 450                 rc = -ENOMEM;
 451                 goto err;
 452         }
 453         for (i = 0; i < MAX_CFA_CODE; i++)
 454                 cfa_code_map[i] = VF_IDX_INVALID;
 455
 456         for (i = 0; i < num_vfs; i++) {
 457                 dev = alloc_etherdev(sizeof(*vf_rep));
 458                 if (!dev) {
 459                         rc = -ENOMEM;
 460                         goto err;
 461                 }
 462
 463                 vf_rep = netdev_priv(dev);
 464                 bp->vf_reps[i] = vf_rep;
 465                 vf_rep->dev = dev;
 466                 vf_rep->bp = bp;
 467                 vf_rep->vf_idx = i;
 468                 vf_rep->tx_cfa_action = CFA_HANDLE_INVALID;
 469
 470                 /* get cfa handles from FW */
 471                 rc = hwrm_cfa_vfr_alloc(bp, vf_rep->vf_idx,
 472                                         &vf_rep->tx_cfa_action,
 473                                         &vf_rep->rx_cfa_code);
 474                 if (rc) {
 475                         rc = -ENOLINK;
 476                         goto err;
 477                 }
 478                 cfa_code_map[vf_rep->rx_cfa_code] = vf_rep->vf_idx;
 479
 480                 vf_rep->dst = metadata_dst_alloc(0, METADATA_HW_PORT_MUX,
 481                                                  GFP_KERNEL);
 482                 if (!vf_rep->dst) {
 483                         rc = -ENOMEM;
 484                         goto err;
 485                 }
 486                 /* only cfa_action is needed to mux a packet while TXing */
 487                 vf_rep->dst->u.port_info.port_id = vf_rep->tx_cfa_action;
 488                 vf_rep->dst->u.port_info.lower_dev = bp->dev;
 489
 490                 bnxt_vf_rep_netdev_init(bp, vf_rep, dev);
 491                 rc = register_netdev(dev);
 492                 if (rc) {
 493                         /* no need for unregister_netdev in cleanup */
 494                         dev->netdev_ops = NULL;
 495                         goto err;
 496                 }
 497         }
 498
 499         /* Read the adapter's DSN to use as the eswitch switch_id */
 500         rc = bnxt_pcie_dsn_get(bp, bp->switch_id);
 501         if (rc)
 502                 goto err;
 503
 504         /* publish cfa_code_map only after all VF-reps have been initialized */
 505         bp->cfa_code_map = cfa_code_map;
 506         bp->eswitch_mode = DEVLINK_ESWITCH_MODE_SWITCHDEV;
 507         netif_keep_dst(bp->dev);
 508         return 0;
 509
 510 err:
 511         netdev_info(bp->dev, "%s error=%d", __func__, rc);
 512         kfree(cfa_code_map);
 513         __bnxt_vf_reps_destroy(bp);
 514         return rc;
 515 }
 516
 517 /* Devlink related routines */
 518 int bnxt_dl_eswitch_mode_get(struct devlink *devlink, u16 *mode)
 519 {
 520         struct bnxt *bp = bnxt_get_bp_from_dl(devlink);
 521
 522         *mode = bp->eswitch_mode;
 523         return 0;
 524 }
 525
 526 int bnxt_dl_eswitch_mode_set(struct devlink *devlink, u16 mode)
 527 {
 528         struct bnxt *bp = bnxt_get_bp_from_dl(devlink);
 529         int rc = 0;
 530
 531         mutex_lock(&bp->sriov_lock);
 532         if (bp->eswitch_mode == mode) {
 533                 netdev_info(bp->dev, "already in %s eswitch mode",
 534                             mode == DEVLINK_ESWITCH_MODE_LEGACY ?
 535                             "legacy" : "switchdev");
 536                 rc = -EINVAL;
 537                 goto done;
 538         }
 539
 540         switch (mode) {
 541         case DEVLINK_ESWITCH_MODE_LEGACY:
 542                 bnxt_vf_reps_destroy(bp);
 543                 break;
 544
 545         case DEVLINK_ESWITCH_MODE_SWITCHDEV:
 546                 if (pci_num_vf(bp->pdev) == 0) {
 547                         netdev_info(bp->dev,
 548                                     "Enable VFs before setting switchdev mode");
 549                         rc = -EPERM;
 550                         goto done;
 551                 }
 552                 rc = bnxt_vf_reps_create(bp);
 553                 break;
 554
 555         default:
 556                 rc = -EINVAL;
 557                 goto done;
 558         }
 559 done:
 560         mutex_unlock(&bp->sriov_lock);
 561         return rc;
 562 }
 563
 564 #endif