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 LIST_HEAD(bnxt_vf_block_cb_list);
 165
 166 static int bnxt_vf_rep_setup_tc(struct net_device *dev, enum tc_setup_type type,
 167                                 void *type_data)
 168 {
 169         struct bnxt_vf_rep *vf_rep = netdev_priv(dev);
 170
 171         switch (type) {
 172         case TC_SETUP_BLOCK:
 173                 return flow_block_cb_setup_simple(type_data,
 174                                                   &bnxt_vf_block_cb_list,
 175                                                   bnxt_vf_rep_setup_tc_block_cb,
 176                                                   vf_rep, vf_rep, true);
 177         default:
 178                 return -EOPNOTSUPP;
 179         }
 180 }
 181
 182 struct net_device *bnxt_get_vf_rep(struct bnxt *bp, u16 cfa_code)
 183 {
 184         u16 vf_idx;
 185
 186         if (cfa_code && bp->cfa_code_map && BNXT_PF(bp)) {
 187                 vf_idx = bp->cfa_code_map[cfa_code];
 188                 if (vf_idx != VF_IDX_INVALID)
 189                         return bp->vf_reps[vf_idx]->dev;
 190         }
 191         return NULL;
 192 }
 193
 194 void bnxt_vf_rep_rx(struct bnxt *bp, struct sk_buff *skb)
 195 {
 196         struct bnxt_vf_rep *vf_rep = netdev_priv(skb->dev);
 197
 198         vf_rep->rx_stats.bytes += skb->len;
 199         vf_rep->rx_stats.packets++;
 200
 201         netif_receive_skb(skb);
 202 }
 203
 204 static int bnxt_vf_rep_get_phys_port_name(struct net_device *dev, char *buf,
 205                                           size_t len)
 206 {
 207         struct bnxt_vf_rep *vf_rep = netdev_priv(dev);
 208         struct pci_dev *pf_pdev = vf_rep->bp->pdev;
 209         int rc;
 210
 211         rc = snprintf(buf, len, "pf%dvf%d", PCI_FUNC(pf_pdev->devfn),
 212                       vf_rep->vf_idx);
 213         if (rc >= len)
 214                 return -EOPNOTSUPP;
 215         return 0;
 216 }
 217
 218 static void bnxt_vf_rep_get_drvinfo(struct net_device *dev,
 219                                     struct ethtool_drvinfo *info)
 220 {
 221         strlcpy(info->driver, DRV_MODULE_NAME, sizeof(info->driver));
 222         strlcpy(info->version, DRV_MODULE_VERSION, sizeof(info->version));
 223 }
 224
 225 static int bnxt_vf_rep_get_port_parent_id(struct net_device *dev,
 226                                           struct netdev_phys_item_id *ppid)
 227 {
 228         struct bnxt_vf_rep *vf_rep = netdev_priv(dev);
 229
 230         /* as only PORT_PARENT_ID is supported currently use common code
 231          * between PF and VF-rep for now.
 232          */
 233         return bnxt_get_port_parent_id(vf_rep->bp->dev, ppid);
 234 }
 235
 236 static const struct ethtool_ops bnxt_vf_rep_ethtool_ops = {
 237         .get_drvinfo            = bnxt_vf_rep_get_drvinfo
 238 };
 239
 240 static const struct net_device_ops bnxt_vf_rep_netdev_ops = {
 241         .ndo_open               = bnxt_vf_rep_open,
 242         .ndo_stop               = bnxt_vf_rep_close,
 243         .ndo_start_xmit         = bnxt_vf_rep_xmit,
 244         .ndo_get_stats64        = bnxt_vf_rep_get_stats64,
 245         .ndo_setup_tc           = bnxt_vf_rep_setup_tc,
 246         .ndo_get_port_parent_id = bnxt_vf_rep_get_port_parent_id,
 247         .ndo_get_phys_port_name = bnxt_vf_rep_get_phys_port_name
 248 };
 249
 250 bool bnxt_dev_is_vf_rep(struct net_device *dev)
 251 {
 252         return dev->netdev_ops == &bnxt_vf_rep_netdev_ops;
 253 }
 254
 255 /* Called when the parent PF interface is closed:
 256  * As the mode transition from SWITCHDEV to LEGACY
 257  * happens under the rtnl_lock() this routine is safe
 258  * under the rtnl_lock()
 259  */
 260 void bnxt_vf_reps_close(struct bnxt *bp)
 261 {
 262         struct bnxt_vf_rep *vf_rep;
 263         u16 num_vfs, i;
 264
 265         if (bp->eswitch_mode != DEVLINK_ESWITCH_MODE_SWITCHDEV)
 266                 return;
 267
 268         num_vfs = pci_num_vf(bp->pdev);
 269         for (i = 0; i < num_vfs; i++) {
 270                 vf_rep = bp->vf_reps[i];
 271                 if (netif_running(vf_rep->dev))
 272                         bnxt_vf_rep_close(vf_rep->dev);
 273         }
 274 }
 275
 276 /* Called when the parent PF interface is opened (re-opened):
 277  * As the mode transition from SWITCHDEV to LEGACY
 278  * happen under the rtnl_lock() this routine is safe
 279  * under the rtnl_lock()
 280  */
 281 void bnxt_vf_reps_open(struct bnxt *bp)
 282 {
 283         int i;
 284
 285         if (bp->eswitch_mode != DEVLINK_ESWITCH_MODE_SWITCHDEV)
 286                 return;
 287
 288         for (i = 0; i < pci_num_vf(bp->pdev); i++)
 289                 bnxt_vf_rep_open(bp->vf_reps[i]->dev);
 290 }
 291
 292 static void __bnxt_vf_reps_destroy(struct bnxt *bp)
 293 {
 294         u16 num_vfs = pci_num_vf(bp->pdev);
 295         struct bnxt_vf_rep *vf_rep;
 296         int i;
 297
 298         for (i = 0; i < num_vfs; i++) {
 299                 vf_rep = bp->vf_reps[i];
 300                 if (vf_rep) {
 301                         dst_release((struct dst_entry *)vf_rep->dst);
 302
 303                         if (vf_rep->tx_cfa_action != CFA_HANDLE_INVALID)
 304                                 hwrm_cfa_vfr_free(bp, vf_rep->vf_idx);
 305
 306                         if (vf_rep->dev) {
 307                                 /* if register_netdev failed, then netdev_ops
 308                                  * would have been set to NULL
 309                                  */
 310                                 if (vf_rep->dev->netdev_ops)
 311                                         unregister_netdev(vf_rep->dev);
 312                                 free_netdev(vf_rep->dev);
 313                         }
 314                 }
 315         }
 316
 317         kfree(bp->vf_reps);
 318         bp->vf_reps = NULL;
 319 }
 320
 321 void bnxt_vf_reps_destroy(struct bnxt *bp)
 322 {
 323         bool closed = false;
 324
 325         if (bp->eswitch_mode != DEVLINK_ESWITCH_MODE_SWITCHDEV)
 326                 return;
 327
 328         if (!bp->vf_reps)
 329                 return;
 330
 331         /* Ensure that parent PF's and VF-reps' RX/TX has been quiesced
 332          * before proceeding with VF-rep cleanup.
 333          */
 334         rtnl_lock();
 335         if (netif_running(bp->dev)) {
 336                 bnxt_close_nic(bp, false, false);
 337                 closed = true;
 338         }
 339         /* un-publish cfa_code_map so that RX path can't see it anymore */
 340         kfree(bp->cfa_code_map);
 341         bp->cfa_code_map = NULL;
 342         bp->eswitch_mode = DEVLINK_ESWITCH_MODE_LEGACY;
 343
 344         if (closed)
 345                 bnxt_open_nic(bp, false, false);
 346         rtnl_unlock();
 347
 348         /* Need to call vf_reps_destroy() outside of rntl_lock
 349          * as unregister_netdev takes rtnl_lock
 350          */
 351         __bnxt_vf_reps_destroy(bp);
 352 }
 353
 354 /* Use the OUI of the PF's perm addr and report the same mac addr
 355  * for the same VF-rep each time
 356  */
 357 static void bnxt_vf_rep_eth_addr_gen(u8 *src_mac, u16 vf_idx, u8 *mac)
 358 {
 359         u32 addr;
 360
 361         ether_addr_copy(mac, src_mac);
 362
 363         addr = jhash(src_mac, ETH_ALEN, 0) + vf_idx;
 364         mac[3] = (u8)(addr & 0xFF);
 365         mac[4] = (u8)((addr >> 8) & 0xFF);
 366         mac[5] = (u8)((addr >> 16) & 0xFF);
 367 }
 368
 369 static void bnxt_vf_rep_netdev_init(struct bnxt *bp, struct bnxt_vf_rep *vf_rep,
 370                                     struct net_device *dev)
 371 {
 372         struct net_device *pf_dev = bp->dev;
 373         u16 max_mtu;
 374
 375         dev->netdev_ops = &bnxt_vf_rep_netdev_ops;
 376         dev->ethtool_ops = &bnxt_vf_rep_ethtool_ops;
 377         /* Just inherit all the featues of the parent PF as the VF-R
 378          * uses the RX/TX rings of the parent PF
 379          */
 380         dev->hw_features = pf_dev->hw_features;
 381         dev->gso_partial_features = pf_dev->gso_partial_features;
 382         dev->vlan_features = pf_dev->vlan_features;
 383         dev->hw_enc_features = pf_dev->hw_enc_features;
 384         dev->features |= pf_dev->features;
 385         bnxt_vf_rep_eth_addr_gen(bp->pf.mac_addr, vf_rep->vf_idx,
 386                                  dev->perm_addr);
 387         ether_addr_copy(dev->dev_addr, dev->perm_addr);
 388         /* Set VF-Rep's max-mtu to the corresponding VF's max-mtu */
 389         if (!bnxt_hwrm_vfr_qcfg(bp, vf_rep, &max_mtu))
 390                 dev->max_mtu = max_mtu;
 391         dev->min_mtu = ETH_ZLEN;
 392 }
 393
 394 static int bnxt_vf_reps_create(struct bnxt *bp)
 395 {
 396         u16 *cfa_code_map = NULL, num_vfs = pci_num_vf(bp->pdev);
 397         struct bnxt_vf_rep *vf_rep;
 398         struct net_device *dev;
 399         int rc, i;
 400
 401         bp->vf_reps = kcalloc(num_vfs, sizeof(vf_rep), GFP_KERNEL);
 402         if (!bp->vf_reps)
 403                 return -ENOMEM;
 404
 405         /* storage for cfa_code to vf-idx mapping */
 406         cfa_code_map = kmalloc_array(MAX_CFA_CODE, sizeof(*bp->cfa_code_map),
 407                                      GFP_KERNEL);
 408         if (!cfa_code_map) {
 409                 rc = -ENOMEM;
 410                 goto err;
 411         }
 412         for (i = 0; i < MAX_CFA_CODE; i++)
 413                 cfa_code_map[i] = VF_IDX_INVALID;
 414
 415         for (i = 0; i < num_vfs; i++) {
 416                 dev = alloc_etherdev(sizeof(*vf_rep));
 417                 if (!dev) {
 418                         rc = -ENOMEM;
 419                         goto err;
 420                 }
 421
 422                 vf_rep = netdev_priv(dev);
 423                 bp->vf_reps[i] = vf_rep;
 424                 vf_rep->dev = dev;
 425                 vf_rep->bp = bp;
 426                 vf_rep->vf_idx = i;
 427                 vf_rep->tx_cfa_action = CFA_HANDLE_INVALID;
 428
 429                 /* get cfa handles from FW */
 430                 rc = hwrm_cfa_vfr_alloc(bp, vf_rep->vf_idx,
 431                                         &vf_rep->tx_cfa_action,
 432                                         &vf_rep->rx_cfa_code);
 433                 if (rc) {
 434                         rc = -ENOLINK;
 435                         goto err;
 436                 }
 437                 cfa_code_map[vf_rep->rx_cfa_code] = vf_rep->vf_idx;
 438
 439                 vf_rep->dst = metadata_dst_alloc(0, METADATA_HW_PORT_MUX,
 440                                                  GFP_KERNEL);
 441                 if (!vf_rep->dst) {
 442                         rc = -ENOMEM;
 443                         goto err;
 444                 }
 445                 /* only cfa_action is needed to mux a packet while TXing */
 446                 vf_rep->dst->u.port_info.port_id = vf_rep->tx_cfa_action;
 447                 vf_rep->dst->u.port_info.lower_dev = bp->dev;
 448
 449                 bnxt_vf_rep_netdev_init(bp, vf_rep, dev);
 450                 rc = register_netdev(dev);
 451                 if (rc) {
 452                         /* no need for unregister_netdev in cleanup */
 453                         dev->netdev_ops = NULL;
 454                         goto err;
 455                 }
 456         }
 457
 458         /* publish cfa_code_map only after all VF-reps have been initialized */
 459         bp->cfa_code_map = cfa_code_map;
 460         bp->eswitch_mode = DEVLINK_ESWITCH_MODE_SWITCHDEV;
 461         netif_keep_dst(bp->dev);
 462         return 0;
 463
 464 err:
 465         netdev_info(bp->dev, "%s error=%d", __func__, rc);
 466         kfree(cfa_code_map);
 467         __bnxt_vf_reps_destroy(bp);
 468         return rc;
 469 }
 470
 471 /* Devlink related routines */
 472 int bnxt_dl_eswitch_mode_get(struct devlink *devlink, u16 *mode)
 473 {
 474         struct bnxt *bp = bnxt_get_bp_from_dl(devlink);
 475
 476         *mode = bp->eswitch_mode;
 477         return 0;
 478 }
 479
 480 int bnxt_dl_eswitch_mode_set(struct devlink *devlink, u16 mode,
 481                              struct netlink_ext_ack *extack)
 482 {
 483         struct bnxt *bp = bnxt_get_bp_from_dl(devlink);
 484         int rc = 0;
 485
 486         mutex_lock(&bp->sriov_lock);
 487         if (bp->eswitch_mode == mode) {
 488                 netdev_info(bp->dev, "already in %s eswitch mode",
 489                             mode == DEVLINK_ESWITCH_MODE_LEGACY ?
 490                             "legacy" : "switchdev");
 491                 rc = -EINVAL;
 492                 goto done;
 493         }
 494
 495         switch (mode) {
 496         case DEVLINK_ESWITCH_MODE_LEGACY:
 497                 bnxt_vf_reps_destroy(bp);
 498                 break;
 499
 500         case DEVLINK_ESWITCH_MODE_SWITCHDEV:
 501                 if (bp->hwrm_spec_code < 0x10803) {
 502                         netdev_warn(bp->dev, "FW does not support SRIOV E-Switch SWITCHDEV mode\n");
 503                         rc = -ENOTSUPP;
 504                         goto done;
 505                 }
 506
 507                 if (pci_num_vf(bp->pdev) == 0) {
 508                         netdev_info(bp->dev, "Enable VFs before setting switchdev mode");
 509                         rc = -EPERM;
 510                         goto done;
 511                 }
 512                 rc = bnxt_vf_reps_create(bp);
 513                 break;
 514
 515         default:
 516                 rc = -EINVAL;
 517                 goto done;
 518         }
 519 done:
 520         mutex_unlock(&bp->sriov_lock);
 521         return rc;
 522 }
 523
 524 #endif