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_vf_rep_open(struct net_device *dev) 68 { 69 struct bnxt_vf_rep *vf_rep = netdev_priv(dev); 70 struct bnxt *bp = vf_rep->bp; 71 72 /* Enable link and TX only if the parent PF is open. */ 73 if (netif_running(bp->dev)) { 74 netif_carrier_on(dev); 75 netif_tx_start_all_queues(dev); 76 } 77 return 0; 78 } 79 80 static int bnxt_vf_rep_close(struct net_device *dev) 81 { 82 netif_carrier_off(dev); 83 netif_tx_disable(dev); 84 85 return 0; 86 } 87 88 static netdev_tx_t bnxt_vf_rep_xmit(struct sk_buff *skb, 89 struct net_device *dev) 90 { 91 struct bnxt_vf_rep *vf_rep = netdev_priv(dev); 92 int rc, len = skb->len; 93 94 skb_dst_drop(skb); 95 dst_hold((struct dst_entry *)vf_rep->dst); 96 skb_dst_set(skb, (struct dst_entry *)vf_rep->dst); 97 skb->dev = vf_rep->dst->u.port_info.lower_dev; 98 99 rc = dev_queue_xmit(skb); 100 if (!rc) { 101 vf_rep->tx_stats.packets++; 102 vf_rep->tx_stats.bytes += len; 103 } 104 return rc; 105 } 106 107 static void 108 bnxt_vf_rep_get_stats64(struct net_device *dev, 109 struct rtnl_link_stats64 *stats) 110 { 111 struct bnxt_vf_rep *vf_rep = netdev_priv(dev); 112 113 stats->rx_packets = vf_rep->rx_stats.packets; 114 stats->rx_bytes = vf_rep->rx_stats.bytes; 115 stats->tx_packets = vf_rep->tx_stats.packets; 116 stats->tx_bytes = vf_rep->tx_stats.bytes; 117 } 118 119 static int bnxt_vf_rep_setup_tc_block_cb(enum tc_setup_type type, 120 void *type_data, 121 void *cb_priv) 122 { 123 struct bnxt_vf_rep *vf_rep = cb_priv; 124 struct bnxt *bp = vf_rep->bp; 125 int vf_fid = bp->pf.vf[vf_rep->vf_idx].fw_fid; 126 127 if (!bnxt_tc_flower_enabled(vf_rep->bp) || !tc_can_offload(bp->dev)) 128 return -EOPNOTSUPP; 129 130 switch (type) { 131 case TC_SETUP_CLSFLOWER: 132 return bnxt_tc_setup_flower(bp, vf_fid, type_data); 133 default: 134 return -EOPNOTSUPP; 135 } 136 } 137 138 static int bnxt_vf_rep_setup_tc_block(struct net_device *dev, 139 struct tc_block_offload *f) 140 { 141 struct bnxt_vf_rep *vf_rep = netdev_priv(dev); 142 143 if (f->binder_type != TCF_BLOCK_BINDER_TYPE_CLSACT_INGRESS) 144 return -EOPNOTSUPP; 145 146 switch (f->command) { 147 case TC_BLOCK_BIND: 148 return tcf_block_cb_register(f->block, 149 bnxt_vf_rep_setup_tc_block_cb, 150 vf_rep, vf_rep); 151 case TC_BLOCK_UNBIND: 152 tcf_block_cb_unregister(f->block, 153 bnxt_vf_rep_setup_tc_block_cb, vf_rep); 154 return 0; 155 default: 156 return -EOPNOTSUPP; 157 } 158 } 159 160 static int bnxt_vf_rep_setup_tc(struct net_device *dev, enum tc_setup_type type, 161 void *type_data) 162 { 163 switch (type) { 164 case TC_SETUP_BLOCK: 165 return bnxt_vf_rep_setup_tc_block(dev, type_data); 166 default: 167 return -EOPNOTSUPP; 168 } 169 } 170 171 struct net_device *bnxt_get_vf_rep(struct bnxt *bp, u16 cfa_code) 172 { 173 u16 vf_idx; 174 175 if (cfa_code && bp->cfa_code_map && BNXT_PF(bp)) { 176 vf_idx = bp->cfa_code_map[cfa_code]; 177 if (vf_idx != VF_IDX_INVALID) 178 return bp->vf_reps[vf_idx]->dev; 179 } 180 return NULL; 181 } 182 183 void bnxt_vf_rep_rx(struct bnxt *bp, struct sk_buff *skb) 184 { 185 struct bnxt_vf_rep *vf_rep = netdev_priv(skb->dev); 186 struct bnxt_vf_rep_stats *rx_stats; 187 188 rx_stats = &vf_rep->rx_stats; 189 vf_rep->rx_stats.bytes += skb->len; 190 vf_rep->rx_stats.packets++; 191 192 netif_receive_skb(skb); 193 } 194 195 static int bnxt_vf_rep_get_phys_port_name(struct net_device *dev, char *buf, 196 size_t len) 197 { 198 struct bnxt_vf_rep *vf_rep = netdev_priv(dev); 199 struct pci_dev *pf_pdev = vf_rep->bp->pdev; 200 int rc; 201 202 rc = snprintf(buf, len, "pf%dvf%d", PCI_FUNC(pf_pdev->devfn), 203 vf_rep->vf_idx); 204 if (rc >= len) 205 return -EOPNOTSUPP; 206 return 0; 207 } 208 209 static void bnxt_vf_rep_get_drvinfo(struct net_device *dev, 210 struct ethtool_drvinfo *info) 211 { 212 strlcpy(info->driver, DRV_MODULE_NAME, sizeof(info->driver)); 213 strlcpy(info->version, DRV_MODULE_VERSION, sizeof(info->version)); 214 } 215 216 static int bnxt_vf_rep_port_attr_get(struct net_device *dev, 217 struct switchdev_attr *attr) 218 { 219 struct bnxt_vf_rep *vf_rep = netdev_priv(dev); 220 221 /* as only PORT_PARENT_ID is supported currently use common code 222 * between PF and VF-rep for now. 223 */ 224 return bnxt_port_attr_get(vf_rep->bp, attr); 225 } 226 227 static const struct switchdev_ops bnxt_vf_rep_switchdev_ops = { 228 .switchdev_port_attr_get = bnxt_vf_rep_port_attr_get 229 }; 230 231 static const struct ethtool_ops bnxt_vf_rep_ethtool_ops = { 232 .get_drvinfo = bnxt_vf_rep_get_drvinfo 233 }; 234 235 static const struct net_device_ops bnxt_vf_rep_netdev_ops = { 236 .ndo_open = bnxt_vf_rep_open, 237 .ndo_stop = bnxt_vf_rep_close, 238 .ndo_start_xmit = bnxt_vf_rep_xmit, 239 .ndo_get_stats64 = bnxt_vf_rep_get_stats64, 240 .ndo_setup_tc = bnxt_vf_rep_setup_tc, 241 .ndo_get_phys_port_name = bnxt_vf_rep_get_phys_port_name 242 }; 243 244 /* Called when the parent PF interface is closed: 245 * As the mode transition from SWITCHDEV to LEGACY 246 * happens under the rtnl_lock() this routine is safe 247 * under the rtnl_lock() 248 */ 249 void bnxt_vf_reps_close(struct bnxt *bp) 250 { 251 struct bnxt_vf_rep *vf_rep; 252 u16 num_vfs, i; 253 254 if (bp->eswitch_mode != DEVLINK_ESWITCH_MODE_SWITCHDEV) 255 return; 256 257 num_vfs = pci_num_vf(bp->pdev); 258 for (i = 0; i < num_vfs; i++) { 259 vf_rep = bp->vf_reps[i]; 260 if (netif_running(vf_rep->dev)) 261 bnxt_vf_rep_close(vf_rep->dev); 262 } 263 } 264 265 /* Called when the parent PF interface is opened (re-opened): 266 * As the mode transition from SWITCHDEV to LEGACY 267 * happen under the rtnl_lock() this routine is safe 268 * under the rtnl_lock() 269 */ 270 void bnxt_vf_reps_open(struct bnxt *bp) 271 { 272 int i; 273 274 if (bp->eswitch_mode != DEVLINK_ESWITCH_MODE_SWITCHDEV) 275 return; 276 277 for (i = 0; i < pci_num_vf(bp->pdev); i++) 278 bnxt_vf_rep_open(bp->vf_reps[i]->dev); 279 } 280 281 static void __bnxt_vf_reps_destroy(struct bnxt *bp) 282 { 283 u16 num_vfs = pci_num_vf(bp->pdev); 284 struct bnxt_vf_rep *vf_rep; 285 int i; 286 287 for (i = 0; i < num_vfs; i++) { 288 vf_rep = bp->vf_reps[i]; 289 if (vf_rep) { 290 dst_release((struct dst_entry *)vf_rep->dst); 291 292 if (vf_rep->tx_cfa_action != CFA_HANDLE_INVALID) 293 hwrm_cfa_vfr_free(bp, vf_rep->vf_idx); 294 295 if (vf_rep->dev) { 296 /* if register_netdev failed, then netdev_ops 297 * would have been set to NULL 298 */ 299 if (vf_rep->dev->netdev_ops) 300 unregister_netdev(vf_rep->dev); 301 free_netdev(vf_rep->dev); 302 } 303 } 304 } 305 306 kfree(bp->vf_reps); 307 bp->vf_reps = NULL; 308 } 309 310 void bnxt_vf_reps_destroy(struct bnxt *bp) 311 { 312 bool closed = false; 313 314 if (bp->eswitch_mode != DEVLINK_ESWITCH_MODE_SWITCHDEV) 315 return; 316 317 if (!bp->vf_reps) 318 return; 319 320 /* Ensure that parent PF's and VF-reps' RX/TX has been quiesced 321 * before proceeding with VF-rep cleanup. 322 */ 323 rtnl_lock(); 324 if (netif_running(bp->dev)) { 325 bnxt_close_nic(bp, false, false); 326 closed = true; 327 } 328 /* un-publish cfa_code_map so that RX path can't see it anymore */ 329 kfree(bp->cfa_code_map); 330 bp->cfa_code_map = NULL; 331 bp->eswitch_mode = DEVLINK_ESWITCH_MODE_LEGACY; 332 333 if (closed) 334 bnxt_open_nic(bp, false, false); 335 rtnl_unlock(); 336 337 /* Need to call vf_reps_destroy() outside of rntl_lock 338 * as unregister_netdev takes rtnl_lock 339 */ 340 __bnxt_vf_reps_destroy(bp); 341 } 342 343 /* Use the OUI of the PF's perm addr and report the same mac addr 344 * for the same VF-rep each time 345 */ 346 static void bnxt_vf_rep_eth_addr_gen(u8 *src_mac, u16 vf_idx, u8 *mac) 347 { 348 u32 addr; 349 350 ether_addr_copy(mac, src_mac); 351 352 addr = jhash(src_mac, ETH_ALEN, 0) + vf_idx; 353 mac[3] = (u8)(addr & 0xFF); 354 mac[4] = (u8)((addr >> 8) & 0xFF); 355 mac[5] = (u8)((addr >> 16) & 0xFF); 356 } 357 358 static void bnxt_vf_rep_netdev_init(struct bnxt *bp, struct bnxt_vf_rep *vf_rep, 359 struct net_device *dev) 360 { 361 struct net_device *pf_dev = bp->dev; 362 363 dev->netdev_ops = &bnxt_vf_rep_netdev_ops; 364 dev->ethtool_ops = &bnxt_vf_rep_ethtool_ops; 365 SWITCHDEV_SET_OPS(dev, &bnxt_vf_rep_switchdev_ops); 366 /* Just inherit all the featues of the parent PF as the VF-R 367 * uses the RX/TX rings of the parent PF 368 */ 369 dev->hw_features = pf_dev->hw_features; 370 dev->gso_partial_features = pf_dev->gso_partial_features; 371 dev->vlan_features = pf_dev->vlan_features; 372 dev->hw_enc_features = pf_dev->hw_enc_features; 373 dev->features |= pf_dev->features; 374 bnxt_vf_rep_eth_addr_gen(bp->pf.mac_addr, vf_rep->vf_idx, 375 dev->perm_addr); 376 ether_addr_copy(dev->dev_addr, dev->perm_addr); 377 } 378 379 static int bnxt_vf_reps_create(struct bnxt *bp) 380 { 381 u16 *cfa_code_map = NULL, num_vfs = pci_num_vf(bp->pdev); 382 struct bnxt_vf_rep *vf_rep; 383 struct net_device *dev; 384 int rc, i; 385 386 bp->vf_reps = kcalloc(num_vfs, sizeof(vf_rep), GFP_KERNEL); 387 if (!bp->vf_reps) 388 return -ENOMEM; 389 390 /* storage for cfa_code to vf-idx mapping */ 391 cfa_code_map = kmalloc(sizeof(*bp->cfa_code_map) * MAX_CFA_CODE, 392 GFP_KERNEL); 393 if (!cfa_code_map) { 394 rc = -ENOMEM; 395 goto err; 396 } 397 for (i = 0; i < MAX_CFA_CODE; i++) 398 cfa_code_map[i] = VF_IDX_INVALID; 399 400 for (i = 0; i < num_vfs; i++) { 401 dev = alloc_etherdev(sizeof(*vf_rep)); 402 if (!dev) { 403 rc = -ENOMEM; 404 goto err; 405 } 406 407 vf_rep = netdev_priv(dev); 408 bp->vf_reps[i] = vf_rep; 409 vf_rep->dev = dev; 410 vf_rep->bp = bp; 411 vf_rep->vf_idx = i; 412 vf_rep->tx_cfa_action = CFA_HANDLE_INVALID; 413 414 /* get cfa handles from FW */ 415 rc = hwrm_cfa_vfr_alloc(bp, vf_rep->vf_idx, 416 &vf_rep->tx_cfa_action, 417 &vf_rep->rx_cfa_code); 418 if (rc) { 419 rc = -ENOLINK; 420 goto err; 421 } 422 cfa_code_map[vf_rep->rx_cfa_code] = vf_rep->vf_idx; 423 424 vf_rep->dst = metadata_dst_alloc(0, METADATA_HW_PORT_MUX, 425 GFP_KERNEL); 426 if (!vf_rep->dst) { 427 rc = -ENOMEM; 428 goto err; 429 } 430 /* only cfa_action is needed to mux a packet while TXing */ 431 vf_rep->dst->u.port_info.port_id = vf_rep->tx_cfa_action; 432 vf_rep->dst->u.port_info.lower_dev = bp->dev; 433 434 bnxt_vf_rep_netdev_init(bp, vf_rep, dev); 435 rc = register_netdev(dev); 436 if (rc) { 437 /* no need for unregister_netdev in cleanup */ 438 dev->netdev_ops = NULL; 439 goto err; 440 } 441 } 442 443 /* publish cfa_code_map only after all VF-reps have been initialized */ 444 bp->cfa_code_map = cfa_code_map; 445 bp->eswitch_mode = DEVLINK_ESWITCH_MODE_SWITCHDEV; 446 netif_keep_dst(bp->dev); 447 return 0; 448 449 err: 450 netdev_info(bp->dev, "%s error=%d", __func__, rc); 451 kfree(cfa_code_map); 452 __bnxt_vf_reps_destroy(bp); 453 return rc; 454 } 455 456 /* Devlink related routines */ 457 int bnxt_dl_eswitch_mode_get(struct devlink *devlink, u16 *mode) 458 { 459 struct bnxt *bp = bnxt_get_bp_from_dl(devlink); 460 461 *mode = bp->eswitch_mode; 462 return 0; 463 } 464 465 int bnxt_dl_eswitch_mode_set(struct devlink *devlink, u16 mode) 466 { 467 struct bnxt *bp = bnxt_get_bp_from_dl(devlink); 468 int rc = 0; 469 470 mutex_lock(&bp->sriov_lock); 471 if (bp->eswitch_mode == mode) { 472 netdev_info(bp->dev, "already in %s eswitch mode", 473 mode == DEVLINK_ESWITCH_MODE_LEGACY ? 474 "legacy" : "switchdev"); 475 rc = -EINVAL; 476 goto done; 477 } 478 479 switch (mode) { 480 case DEVLINK_ESWITCH_MODE_LEGACY: 481 bnxt_vf_reps_destroy(bp); 482 break; 483 484 case DEVLINK_ESWITCH_MODE_SWITCHDEV: 485 if (pci_num_vf(bp->pdev) == 0) { 486 netdev_info(bp->dev, 487 "Enable VFs before setting switchdev mode"); 488 rc = -EPERM; 489 goto done; 490 } 491 rc = bnxt_vf_reps_create(bp); 492 break; 493 494 default: 495 rc = -EINVAL; 496 goto done; 497 } 498 done: 499 mutex_unlock(&bp->sriov_lock); 500 return rc; 501 } 502 503 #endif 504