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 if (!(bp->flags & BNXT_FLAG_DSN_VALID)) 402 return -ENODEV; 403 404 bp->vf_reps = kcalloc(num_vfs, sizeof(vf_rep), GFP_KERNEL); 405 if (!bp->vf_reps) 406 return -ENOMEM; 407 408 /* storage for cfa_code to vf-idx mapping */ 409 cfa_code_map = kmalloc_array(MAX_CFA_CODE, sizeof(*bp->cfa_code_map), 410 GFP_KERNEL); 411 if (!cfa_code_map) { 412 rc = -ENOMEM; 413 goto err; 414 } 415 for (i = 0; i < MAX_CFA_CODE; i++) 416 cfa_code_map[i] = VF_IDX_INVALID; 417 418 for (i = 0; i < num_vfs; i++) { 419 dev = alloc_etherdev(sizeof(*vf_rep)); 420 if (!dev) { 421 rc = -ENOMEM; 422 goto err; 423 } 424 425 vf_rep = netdev_priv(dev); 426 bp->vf_reps[i] = vf_rep; 427 vf_rep->dev = dev; 428 vf_rep->bp = bp; 429 vf_rep->vf_idx = i; 430 vf_rep->tx_cfa_action = CFA_HANDLE_INVALID; 431 432 /* get cfa handles from FW */ 433 rc = hwrm_cfa_vfr_alloc(bp, vf_rep->vf_idx, 434 &vf_rep->tx_cfa_action, 435 &vf_rep->rx_cfa_code); 436 if (rc) { 437 rc = -ENOLINK; 438 goto err; 439 } 440 cfa_code_map[vf_rep->rx_cfa_code] = vf_rep->vf_idx; 441 442 vf_rep->dst = metadata_dst_alloc(0, METADATA_HW_PORT_MUX, 443 GFP_KERNEL); 444 if (!vf_rep->dst) { 445 rc = -ENOMEM; 446 goto err; 447 } 448 /* only cfa_action is needed to mux a packet while TXing */ 449 vf_rep->dst->u.port_info.port_id = vf_rep->tx_cfa_action; 450 vf_rep->dst->u.port_info.lower_dev = bp->dev; 451 452 bnxt_vf_rep_netdev_init(bp, vf_rep, dev); 453 rc = register_netdev(dev); 454 if (rc) { 455 /* no need for unregister_netdev in cleanup */ 456 dev->netdev_ops = NULL; 457 goto err; 458 } 459 } 460 461 /* publish cfa_code_map only after all VF-reps have been initialized */ 462 bp->cfa_code_map = cfa_code_map; 463 bp->eswitch_mode = DEVLINK_ESWITCH_MODE_SWITCHDEV; 464 netif_keep_dst(bp->dev); 465 return 0; 466 467 err: 468 netdev_info(bp->dev, "%s error=%d", __func__, rc); 469 kfree(cfa_code_map); 470 __bnxt_vf_reps_destroy(bp); 471 return rc; 472 } 473 474 /* Devlink related routines */ 475 int bnxt_dl_eswitch_mode_get(struct devlink *devlink, u16 *mode) 476 { 477 struct bnxt *bp = bnxt_get_bp_from_dl(devlink); 478 479 *mode = bp->eswitch_mode; 480 return 0; 481 } 482 483 int bnxt_dl_eswitch_mode_set(struct devlink *devlink, u16 mode, 484 struct netlink_ext_ack *extack) 485 { 486 struct bnxt *bp = bnxt_get_bp_from_dl(devlink); 487 int rc = 0; 488 489 mutex_lock(&bp->sriov_lock); 490 if (bp->eswitch_mode == mode) { 491 netdev_info(bp->dev, "already in %s eswitch mode", 492 mode == DEVLINK_ESWITCH_MODE_LEGACY ? 493 "legacy" : "switchdev"); 494 rc = -EINVAL; 495 goto done; 496 } 497 498 switch (mode) { 499 case DEVLINK_ESWITCH_MODE_LEGACY: 500 bnxt_vf_reps_destroy(bp); 501 break; 502 503 case DEVLINK_ESWITCH_MODE_SWITCHDEV: 504 if (bp->hwrm_spec_code < 0x10803) { 505 netdev_warn(bp->dev, "FW does not support SRIOV E-Switch SWITCHDEV mode\n"); 506 rc = -ENOTSUPP; 507 goto done; 508 } 509 510 if (pci_num_vf(bp->pdev) == 0) { 511 netdev_info(bp->dev, "Enable VFs before setting switchdev mode"); 512 rc = -EPERM; 513 goto done; 514 } 515 rc = bnxt_vf_reps_create(bp); 516 break; 517 518 default: 519 rc = -EINVAL; 520 goto done; 521 } 522 done: 523 mutex_unlock(&bp->sriov_lock); 524 return rc; 525 } 526 527 #endif 528