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