1 // SPDX-License-Identifier: GPL-2.0 2 /* Copyright (c) 2019, Vladimir Oltean <olteanv@gmail.com> 3 */ 4 #include <linux/if_vlan.h> 5 #include <linux/dsa/sja1105.h> 6 #include <linux/dsa/8021q.h> 7 #include <linux/packing.h> 8 #include "dsa_priv.h" 9 10 /* Is this a TX or an RX header? */ 11 #define SJA1110_HEADER_HOST_TO_SWITCH BIT(15) 12 13 /* RX header */ 14 #define SJA1110_RX_HEADER_IS_METADATA BIT(14) 15 #define SJA1110_RX_HEADER_HOST_ONLY BIT(13) 16 #define SJA1110_RX_HEADER_HAS_TRAILER BIT(12) 17 18 /* Trap-to-host format (no trailer present) */ 19 #define SJA1110_RX_HEADER_SRC_PORT(x) (((x) & GENMASK(7, 4)) >> 4) 20 #define SJA1110_RX_HEADER_SWITCH_ID(x) ((x) & GENMASK(3, 0)) 21 22 /* Timestamp format (trailer present) */ 23 #define SJA1110_RX_HEADER_TRAILER_POS(x) ((x) & GENMASK(11, 0)) 24 25 #define SJA1110_RX_TRAILER_SWITCH_ID(x) (((x) & GENMASK(7, 4)) >> 4) 26 #define SJA1110_RX_TRAILER_SRC_PORT(x) ((x) & GENMASK(3, 0)) 27 28 /* Meta frame format (for 2-step TX timestamps) */ 29 #define SJA1110_RX_HEADER_N_TS(x) (((x) & GENMASK(8, 4)) >> 4) 30 31 /* TX header */ 32 #define SJA1110_TX_HEADER_UPDATE_TC BIT(14) 33 #define SJA1110_TX_HEADER_TAKE_TS BIT(13) 34 #define SJA1110_TX_HEADER_TAKE_TS_CASC BIT(12) 35 #define SJA1110_TX_HEADER_HAS_TRAILER BIT(11) 36 37 /* Only valid if SJA1110_TX_HEADER_HAS_TRAILER is false */ 38 #define SJA1110_TX_HEADER_PRIO(x) (((x) << 7) & GENMASK(10, 7)) 39 #define SJA1110_TX_HEADER_TSTAMP_ID(x) ((x) & GENMASK(7, 0)) 40 41 /* Only valid if SJA1110_TX_HEADER_HAS_TRAILER is true */ 42 #define SJA1110_TX_HEADER_TRAILER_POS(x) ((x) & GENMASK(10, 0)) 43 44 #define SJA1110_TX_TRAILER_TSTAMP_ID(x) (((x) << 24) & GENMASK(31, 24)) 45 #define SJA1110_TX_TRAILER_PRIO(x) (((x) << 21) & GENMASK(23, 21)) 46 #define SJA1110_TX_TRAILER_SWITCHID(x) (((x) << 12) & GENMASK(15, 12)) 47 #define SJA1110_TX_TRAILER_DESTPORTS(x) (((x) << 1) & GENMASK(11, 1)) 48 49 #define SJA1110_META_TSTAMP_SIZE 10 50 51 #define SJA1110_HEADER_LEN 4 52 #define SJA1110_RX_TRAILER_LEN 13 53 #define SJA1110_TX_TRAILER_LEN 4 54 #define SJA1110_MAX_PADDING_LEN 15 55 56 /* Similar to is_link_local_ether_addr(hdr->h_dest) but also covers PTP */ 57 static inline bool sja1105_is_link_local(const struct sk_buff *skb) 58 { 59 const struct ethhdr *hdr = eth_hdr(skb); 60 u64 dmac = ether_addr_to_u64(hdr->h_dest); 61 62 if (ntohs(hdr->h_proto) == ETH_P_SJA1105_META) 63 return false; 64 if ((dmac & SJA1105_LINKLOCAL_FILTER_A_MASK) == 65 SJA1105_LINKLOCAL_FILTER_A) 66 return true; 67 if ((dmac & SJA1105_LINKLOCAL_FILTER_B_MASK) == 68 SJA1105_LINKLOCAL_FILTER_B) 69 return true; 70 return false; 71 } 72 73 struct sja1105_meta { 74 u64 tstamp; 75 u64 dmac_byte_4; 76 u64 dmac_byte_3; 77 u64 source_port; 78 u64 switch_id; 79 }; 80 81 static void sja1105_meta_unpack(const struct sk_buff *skb, 82 struct sja1105_meta *meta) 83 { 84 u8 *buf = skb_mac_header(skb) + ETH_HLEN; 85 86 /* UM10944.pdf section 4.2.17 AVB Parameters: 87 * Structure of the meta-data follow-up frame. 88 * It is in network byte order, so there are no quirks 89 * while unpacking the meta frame. 90 * 91 * Also SJA1105 E/T only populates bits 23:0 of the timestamp 92 * whereas P/Q/R/S does 32 bits. Since the structure is the 93 * same and the E/T puts zeroes in the high-order byte, use 94 * a unified unpacking command for both device series. 95 */ 96 packing(buf, &meta->tstamp, 31, 0, 4, UNPACK, 0); 97 packing(buf + 4, &meta->dmac_byte_4, 7, 0, 1, UNPACK, 0); 98 packing(buf + 5, &meta->dmac_byte_3, 7, 0, 1, UNPACK, 0); 99 packing(buf + 6, &meta->source_port, 7, 0, 1, UNPACK, 0); 100 packing(buf + 7, &meta->switch_id, 7, 0, 1, UNPACK, 0); 101 } 102 103 static inline bool sja1105_is_meta_frame(const struct sk_buff *skb) 104 { 105 const struct ethhdr *hdr = eth_hdr(skb); 106 u64 smac = ether_addr_to_u64(hdr->h_source); 107 u64 dmac = ether_addr_to_u64(hdr->h_dest); 108 109 if (smac != SJA1105_META_SMAC) 110 return false; 111 if (dmac != SJA1105_META_DMAC) 112 return false; 113 if (ntohs(hdr->h_proto) != ETH_P_SJA1105_META) 114 return false; 115 return true; 116 } 117 118 /* Calls sja1105_port_deferred_xmit in sja1105_main.c */ 119 static struct sk_buff *sja1105_defer_xmit(struct dsa_port *dp, 120 struct sk_buff *skb) 121 { 122 struct sja1105_port *sp = dp->priv; 123 124 if (!dsa_port_is_sja1105(dp)) 125 return skb; 126 127 /* Increase refcount so the kfree_skb in dsa_slave_xmit 128 * won't really free the packet. 129 */ 130 skb_queue_tail(&sp->xmit_queue, skb_get(skb)); 131 kthread_queue_work(sp->xmit_worker, &sp->xmit_work); 132 133 return NULL; 134 } 135 136 /* Send VLAN tags with a TPID that blends in with whatever VLAN protocol a 137 * bridge spanning ports of this switch might have. 138 */ 139 static u16 sja1105_xmit_tpid(struct dsa_port *dp) 140 { 141 struct dsa_switch *ds = dp->ds; 142 struct dsa_port *other_dp; 143 u16 proto; 144 145 /* Since VLAN awareness is global, then if this port is VLAN-unaware, 146 * all ports are. Use the VLAN-unaware TPID used for tag_8021q. 147 */ 148 if (!dsa_port_is_vlan_filtering(dp)) 149 return ETH_P_SJA1105; 150 151 /* Port is VLAN-aware, so there is a bridge somewhere (a single one, 152 * we're sure about that). It may not be on this port though, so we 153 * need to find it. 154 */ 155 list_for_each_entry(other_dp, &ds->dst->ports, list) { 156 if (other_dp->ds != ds) 157 continue; 158 159 if (!other_dp->bridge_dev) 160 continue; 161 162 /* Error is returned only if CONFIG_BRIDGE_VLAN_FILTERING, 163 * which seems pointless to handle, as our port cannot become 164 * VLAN-aware in that case. 165 */ 166 br_vlan_get_proto(other_dp->bridge_dev, &proto); 167 168 return proto; 169 } 170 171 WARN_ONCE(1, "Port is VLAN-aware but cannot find associated bridge!\n"); 172 173 return ETH_P_SJA1105; 174 } 175 176 static struct sk_buff *sja1105_imprecise_xmit(struct sk_buff *skb, 177 struct net_device *netdev) 178 { 179 struct dsa_port *dp = dsa_slave_to_port(netdev); 180 struct net_device *br = dp->bridge_dev; 181 u16 tx_vid; 182 183 /* If the port is under a VLAN-aware bridge, just slide the 184 * VLAN-tagged packet into the FDB and hope for the best. 185 * This works because we support a single VLAN-aware bridge 186 * across the entire dst, and its VLANs cannot be shared with 187 * any standalone port. 188 */ 189 if (br_vlan_enabled(br)) 190 return skb; 191 192 /* If the port is under a VLAN-unaware bridge, use an imprecise 193 * TX VLAN that targets the bridge's entire broadcast domain, 194 * instead of just the specific port. 195 */ 196 tx_vid = dsa_8021q_bridge_tx_fwd_offload_vid(dp->bridge_num); 197 198 return dsa_8021q_xmit(skb, netdev, sja1105_xmit_tpid(dp), tx_vid); 199 } 200 201 /* Transform untagged control packets into pvid-tagged control packets so that 202 * all packets sent by this tagger are VLAN-tagged and we can configure the 203 * switch to drop untagged packets coming from the DSA master. 204 */ 205 static struct sk_buff *sja1105_pvid_tag_control_pkt(struct dsa_port *dp, 206 struct sk_buff *skb, u8 pcp) 207 { 208 __be16 xmit_tpid = htons(sja1105_xmit_tpid(dp)); 209 struct vlan_ethhdr *hdr; 210 211 /* If VLAN tag is in hwaccel area, move it to the payload 212 * to deal with both cases uniformly and to ensure that 213 * the VLANs are added in the right order. 214 */ 215 if (unlikely(skb_vlan_tag_present(skb))) { 216 skb = __vlan_hwaccel_push_inside(skb); 217 if (!skb) 218 return NULL; 219 } 220 221 hdr = (struct vlan_ethhdr *)skb_mac_header(skb); 222 223 /* If skb is already VLAN-tagged, leave that VLAN ID in place */ 224 if (hdr->h_vlan_proto == xmit_tpid) 225 return skb; 226 227 return vlan_insert_tag(skb, xmit_tpid, (pcp << VLAN_PRIO_SHIFT) | 228 SJA1105_DEFAULT_VLAN); 229 } 230 231 static struct sk_buff *sja1105_xmit(struct sk_buff *skb, 232 struct net_device *netdev) 233 { 234 struct dsa_port *dp = dsa_slave_to_port(netdev); 235 u16 tx_vid = dsa_8021q_tx_vid(dp->ds, dp->index); 236 u16 queue_mapping = skb_get_queue_mapping(skb); 237 u8 pcp = netdev_txq_to_tc(netdev, queue_mapping); 238 239 if (skb->offload_fwd_mark) 240 return sja1105_imprecise_xmit(skb, netdev); 241 242 /* Transmitting management traffic does not rely upon switch tagging, 243 * but instead SPI-installed management routes. Part 2 of this 244 * is the .port_deferred_xmit driver callback. 245 */ 246 if (unlikely(sja1105_is_link_local(skb))) { 247 skb = sja1105_pvid_tag_control_pkt(dp, skb, pcp); 248 if (!skb) 249 return NULL; 250 251 return sja1105_defer_xmit(dp, skb); 252 } 253 254 return dsa_8021q_xmit(skb, netdev, sja1105_xmit_tpid(dp), 255 ((pcp << VLAN_PRIO_SHIFT) | tx_vid)); 256 } 257 258 static struct sk_buff *sja1110_xmit(struct sk_buff *skb, 259 struct net_device *netdev) 260 { 261 struct sk_buff *clone = SJA1105_SKB_CB(skb)->clone; 262 struct dsa_port *dp = dsa_slave_to_port(netdev); 263 u16 tx_vid = dsa_8021q_tx_vid(dp->ds, dp->index); 264 u16 queue_mapping = skb_get_queue_mapping(skb); 265 u8 pcp = netdev_txq_to_tc(netdev, queue_mapping); 266 __be32 *tx_trailer; 267 __be16 *tx_header; 268 int trailer_pos; 269 270 if (skb->offload_fwd_mark) 271 return sja1105_imprecise_xmit(skb, netdev); 272 273 /* Transmitting control packets is done using in-band control 274 * extensions, while data packets are transmitted using 275 * tag_8021q TX VLANs. 276 */ 277 if (likely(!sja1105_is_link_local(skb))) 278 return dsa_8021q_xmit(skb, netdev, sja1105_xmit_tpid(dp), 279 ((pcp << VLAN_PRIO_SHIFT) | tx_vid)); 280 281 skb = sja1105_pvid_tag_control_pkt(dp, skb, pcp); 282 if (!skb) 283 return NULL; 284 285 skb_push(skb, SJA1110_HEADER_LEN); 286 287 dsa_alloc_etype_header(skb, SJA1110_HEADER_LEN); 288 289 trailer_pos = skb->len; 290 291 tx_header = dsa_etype_header_pos_tx(skb); 292 tx_trailer = skb_put(skb, SJA1110_TX_TRAILER_LEN); 293 294 tx_header[0] = htons(ETH_P_SJA1110); 295 tx_header[1] = htons(SJA1110_HEADER_HOST_TO_SWITCH | 296 SJA1110_TX_HEADER_HAS_TRAILER | 297 SJA1110_TX_HEADER_TRAILER_POS(trailer_pos)); 298 *tx_trailer = cpu_to_be32(SJA1110_TX_TRAILER_PRIO(pcp) | 299 SJA1110_TX_TRAILER_SWITCHID(dp->ds->index) | 300 SJA1110_TX_TRAILER_DESTPORTS(BIT(dp->index))); 301 if (clone) { 302 u8 ts_id = SJA1105_SKB_CB(clone)->ts_id; 303 304 tx_header[1] |= htons(SJA1110_TX_HEADER_TAKE_TS); 305 *tx_trailer |= cpu_to_be32(SJA1110_TX_TRAILER_TSTAMP_ID(ts_id)); 306 } 307 308 return skb; 309 } 310 311 static void sja1105_transfer_meta(struct sk_buff *skb, 312 const struct sja1105_meta *meta) 313 { 314 struct ethhdr *hdr = eth_hdr(skb); 315 316 hdr->h_dest[3] = meta->dmac_byte_3; 317 hdr->h_dest[4] = meta->dmac_byte_4; 318 SJA1105_SKB_CB(skb)->tstamp = meta->tstamp; 319 } 320 321 /* This is a simple state machine which follows the hardware mechanism of 322 * generating RX timestamps: 323 * 324 * After each timestampable skb (all traffic for which send_meta1 and 325 * send_meta0 is true, aka all MAC-filtered link-local traffic) a meta frame 326 * containing a partial timestamp is immediately generated by the switch and 327 * sent as a follow-up to the link-local frame on the CPU port. 328 * 329 * The meta frames have no unique identifier (such as sequence number) by which 330 * one may pair them to the correct timestampable frame. 331 * Instead, the switch has internal logic that ensures no frames are sent on 332 * the CPU port between a link-local timestampable frame and its corresponding 333 * meta follow-up. It also ensures strict ordering between ports (lower ports 334 * have higher priority towards the CPU port). For this reason, a per-port 335 * data structure is not needed/desirable. 336 * 337 * This function pairs the link-local frame with its partial timestamp from the 338 * meta follow-up frame. The full timestamp will be reconstructed later in a 339 * work queue. 340 */ 341 static struct sk_buff 342 *sja1105_rcv_meta_state_machine(struct sk_buff *skb, 343 struct sja1105_meta *meta, 344 bool is_link_local, 345 bool is_meta) 346 { 347 /* Step 1: A timestampable frame was received. 348 * Buffer it until we get its meta frame. 349 */ 350 if (is_link_local) { 351 struct dsa_port *dp = dsa_slave_to_port(skb->dev); 352 struct sja1105_port *sp = dp->priv; 353 354 if (unlikely(!dsa_port_is_sja1105(dp))) 355 return skb; 356 357 if (!test_bit(SJA1105_HWTS_RX_EN, &sp->data->state)) 358 /* Do normal processing. */ 359 return skb; 360 361 spin_lock(&sp->data->meta_lock); 362 /* Was this a link-local frame instead of the meta 363 * that we were expecting? 364 */ 365 if (sp->data->stampable_skb) { 366 dev_err_ratelimited(dp->ds->dev, 367 "Expected meta frame, is %12llx " 368 "in the DSA master multicast filter?\n", 369 SJA1105_META_DMAC); 370 kfree_skb(sp->data->stampable_skb); 371 } 372 373 /* Hold a reference to avoid dsa_switch_rcv 374 * from freeing the skb. 375 */ 376 sp->data->stampable_skb = skb_get(skb); 377 spin_unlock(&sp->data->meta_lock); 378 379 /* Tell DSA we got nothing */ 380 return NULL; 381 382 /* Step 2: The meta frame arrived. 383 * Time to take the stampable skb out of the closet, annotate it 384 * with the partial timestamp, and pretend that we received it 385 * just now (basically masquerade the buffered frame as the meta 386 * frame, which serves no further purpose). 387 */ 388 } else if (is_meta) { 389 struct dsa_port *dp = dsa_slave_to_port(skb->dev); 390 struct sja1105_port *sp = dp->priv; 391 struct sk_buff *stampable_skb; 392 393 if (unlikely(!dsa_port_is_sja1105(dp))) 394 return skb; 395 396 /* Drop the meta frame if we're not in the right state 397 * to process it. 398 */ 399 if (!test_bit(SJA1105_HWTS_RX_EN, &sp->data->state)) 400 return NULL; 401 402 spin_lock(&sp->data->meta_lock); 403 404 stampable_skb = sp->data->stampable_skb; 405 sp->data->stampable_skb = NULL; 406 407 /* Was this a meta frame instead of the link-local 408 * that we were expecting? 409 */ 410 if (!stampable_skb) { 411 dev_err_ratelimited(dp->ds->dev, 412 "Unexpected meta frame\n"); 413 spin_unlock(&sp->data->meta_lock); 414 return NULL; 415 } 416 417 if (stampable_skb->dev != skb->dev) { 418 dev_err_ratelimited(dp->ds->dev, 419 "Meta frame on wrong port\n"); 420 spin_unlock(&sp->data->meta_lock); 421 return NULL; 422 } 423 424 /* Free the meta frame and give DSA the buffered stampable_skb 425 * for further processing up the network stack. 426 */ 427 kfree_skb(skb); 428 skb = stampable_skb; 429 sja1105_transfer_meta(skb, meta); 430 431 spin_unlock(&sp->data->meta_lock); 432 } 433 434 return skb; 435 } 436 437 static bool sja1105_skb_has_tag_8021q(const struct sk_buff *skb) 438 { 439 u16 tpid = ntohs(eth_hdr(skb)->h_proto); 440 441 return tpid == ETH_P_SJA1105 || tpid == ETH_P_8021Q || 442 skb_vlan_tag_present(skb); 443 } 444 445 static bool sja1110_skb_has_inband_control_extension(const struct sk_buff *skb) 446 { 447 return ntohs(eth_hdr(skb)->h_proto) == ETH_P_SJA1110; 448 } 449 450 /* If the VLAN in the packet is a tag_8021q one, set @source_port and 451 * @switch_id and strip the header. Otherwise set @vid and keep it in the 452 * packet. 453 */ 454 static void sja1105_vlan_rcv(struct sk_buff *skb, int *source_port, 455 int *switch_id, u16 *vid) 456 { 457 struct vlan_ethhdr *hdr = (struct vlan_ethhdr *)skb_mac_header(skb); 458 u16 vlan_tci; 459 460 if (skb_vlan_tag_present(skb)) 461 vlan_tci = skb_vlan_tag_get(skb); 462 else 463 vlan_tci = ntohs(hdr->h_vlan_TCI); 464 465 if (vid_is_dsa_8021q_rxvlan(vlan_tci & VLAN_VID_MASK)) 466 return dsa_8021q_rcv(skb, source_port, switch_id); 467 468 /* Try our best with imprecise RX */ 469 *vid = vlan_tci & VLAN_VID_MASK; 470 } 471 472 static struct sk_buff *sja1105_rcv(struct sk_buff *skb, 473 struct net_device *netdev) 474 { 475 int source_port = -1, switch_id = -1; 476 struct sja1105_meta meta = {0}; 477 struct ethhdr *hdr; 478 bool is_link_local; 479 bool is_meta; 480 u16 vid; 481 482 hdr = eth_hdr(skb); 483 is_link_local = sja1105_is_link_local(skb); 484 is_meta = sja1105_is_meta_frame(skb); 485 486 if (sja1105_skb_has_tag_8021q(skb)) { 487 /* Normal traffic path. */ 488 sja1105_vlan_rcv(skb, &source_port, &switch_id, &vid); 489 } else if (is_link_local) { 490 /* Management traffic path. Switch embeds the switch ID and 491 * port ID into bytes of the destination MAC, courtesy of 492 * the incl_srcpt options. 493 */ 494 source_port = hdr->h_dest[3]; 495 switch_id = hdr->h_dest[4]; 496 /* Clear the DMAC bytes that were mangled by the switch */ 497 hdr->h_dest[3] = 0; 498 hdr->h_dest[4] = 0; 499 } else if (is_meta) { 500 sja1105_meta_unpack(skb, &meta); 501 source_port = meta.source_port; 502 switch_id = meta.switch_id; 503 } else { 504 return NULL; 505 } 506 507 if (source_port == -1 || switch_id == -1) 508 skb->dev = dsa_find_designated_bridge_port_by_vid(netdev, vid); 509 else 510 skb->dev = dsa_master_find_slave(netdev, switch_id, source_port); 511 if (!skb->dev) { 512 netdev_warn(netdev, "Couldn't decode source port\n"); 513 return NULL; 514 } 515 516 if (!is_link_local) 517 dsa_default_offload_fwd_mark(skb); 518 519 return sja1105_rcv_meta_state_machine(skb, &meta, is_link_local, 520 is_meta); 521 } 522 523 static struct sk_buff *sja1110_rcv_meta(struct sk_buff *skb, u16 rx_header) 524 { 525 u8 *buf = dsa_etype_header_pos_rx(skb) + SJA1110_HEADER_LEN; 526 int switch_id = SJA1110_RX_HEADER_SWITCH_ID(rx_header); 527 int n_ts = SJA1110_RX_HEADER_N_TS(rx_header); 528 struct net_device *master = skb->dev; 529 struct dsa_port *cpu_dp; 530 struct dsa_switch *ds; 531 int i; 532 533 cpu_dp = master->dsa_ptr; 534 ds = dsa_switch_find(cpu_dp->dst->index, switch_id); 535 if (!ds) { 536 net_err_ratelimited("%s: cannot find switch id %d\n", 537 master->name, switch_id); 538 return NULL; 539 } 540 541 for (i = 0; i <= n_ts; i++) { 542 u8 ts_id, source_port, dir; 543 u64 tstamp; 544 545 ts_id = buf[0]; 546 source_port = (buf[1] & GENMASK(7, 4)) >> 4; 547 dir = (buf[1] & BIT(3)) >> 3; 548 tstamp = be64_to_cpu(*(__be64 *)(buf + 2)); 549 550 sja1110_process_meta_tstamp(ds, source_port, ts_id, dir, 551 tstamp); 552 553 buf += SJA1110_META_TSTAMP_SIZE; 554 } 555 556 /* Discard the meta frame, we've consumed the timestamps it contained */ 557 return NULL; 558 } 559 560 static struct sk_buff *sja1110_rcv_inband_control_extension(struct sk_buff *skb, 561 int *source_port, 562 int *switch_id, 563 bool *host_only) 564 { 565 u16 rx_header; 566 567 if (unlikely(!pskb_may_pull(skb, SJA1110_HEADER_LEN))) 568 return NULL; 569 570 /* skb->data points to skb_mac_header(skb) + ETH_HLEN, which is exactly 571 * what we need because the caller has checked the EtherType (which is 572 * located 2 bytes back) and we just need a pointer to the header that 573 * comes afterwards. 574 */ 575 rx_header = ntohs(*(__be16 *)skb->data); 576 577 if (rx_header & SJA1110_RX_HEADER_HOST_ONLY) 578 *host_only = true; 579 580 if (rx_header & SJA1110_RX_HEADER_IS_METADATA) 581 return sja1110_rcv_meta(skb, rx_header); 582 583 /* Timestamp frame, we have a trailer */ 584 if (rx_header & SJA1110_RX_HEADER_HAS_TRAILER) { 585 int start_of_padding = SJA1110_RX_HEADER_TRAILER_POS(rx_header); 586 u8 *rx_trailer = skb_tail_pointer(skb) - SJA1110_RX_TRAILER_LEN; 587 u64 *tstamp = &SJA1105_SKB_CB(skb)->tstamp; 588 u8 last_byte = rx_trailer[12]; 589 590 /* The timestamp is unaligned, so we need to use packing() 591 * to get it 592 */ 593 packing(rx_trailer, tstamp, 63, 0, 8, UNPACK, 0); 594 595 *source_port = SJA1110_RX_TRAILER_SRC_PORT(last_byte); 596 *switch_id = SJA1110_RX_TRAILER_SWITCH_ID(last_byte); 597 598 /* skb->len counts from skb->data, while start_of_padding 599 * counts from the destination MAC address. Right now skb->data 600 * is still as set by the DSA master, so to trim away the 601 * padding and trailer we need to account for the fact that 602 * skb->data points to skb_mac_header(skb) + ETH_HLEN. 603 */ 604 pskb_trim_rcsum(skb, start_of_padding - ETH_HLEN); 605 /* Trap-to-host frame, no timestamp trailer */ 606 } else { 607 *source_port = SJA1110_RX_HEADER_SRC_PORT(rx_header); 608 *switch_id = SJA1110_RX_HEADER_SWITCH_ID(rx_header); 609 } 610 611 /* Advance skb->data past the DSA header */ 612 skb_pull_rcsum(skb, SJA1110_HEADER_LEN); 613 614 dsa_strip_etype_header(skb, SJA1110_HEADER_LEN); 615 616 /* With skb->data in its final place, update the MAC header 617 * so that eth_hdr() continues to works properly. 618 */ 619 skb_set_mac_header(skb, -ETH_HLEN); 620 621 return skb; 622 } 623 624 static struct sk_buff *sja1110_rcv(struct sk_buff *skb, 625 struct net_device *netdev) 626 { 627 int source_port = -1, switch_id = -1; 628 bool host_only = false; 629 u16 vid = 0; 630 631 if (sja1110_skb_has_inband_control_extension(skb)) { 632 skb = sja1110_rcv_inband_control_extension(skb, &source_port, 633 &switch_id, 634 &host_only); 635 if (!skb) 636 return NULL; 637 } 638 639 /* Packets with in-band control extensions might still have RX VLANs */ 640 if (likely(sja1105_skb_has_tag_8021q(skb))) 641 sja1105_vlan_rcv(skb, &source_port, &switch_id, &vid); 642 643 if (source_port == -1 || switch_id == -1) 644 skb->dev = dsa_find_designated_bridge_port_by_vid(netdev, vid); 645 else 646 skb->dev = dsa_master_find_slave(netdev, switch_id, source_port); 647 if (!skb->dev) { 648 netdev_warn(netdev, "Couldn't decode source port\n"); 649 return NULL; 650 } 651 652 if (!host_only) 653 dsa_default_offload_fwd_mark(skb); 654 655 return skb; 656 } 657 658 static void sja1105_flow_dissect(const struct sk_buff *skb, __be16 *proto, 659 int *offset) 660 { 661 /* No tag added for management frames, all ok */ 662 if (unlikely(sja1105_is_link_local(skb))) 663 return; 664 665 dsa_tag_generic_flow_dissect(skb, proto, offset); 666 } 667 668 static void sja1110_flow_dissect(const struct sk_buff *skb, __be16 *proto, 669 int *offset) 670 { 671 /* Management frames have 2 DSA tags on RX, so the needed_headroom we 672 * declared is fine for the generic dissector adjustment procedure. 673 */ 674 if (unlikely(sja1105_is_link_local(skb))) 675 return dsa_tag_generic_flow_dissect(skb, proto, offset); 676 677 /* For the rest, there is a single DSA tag, the tag_8021q one */ 678 *offset = VLAN_HLEN; 679 *proto = ((__be16 *)skb->data)[(VLAN_HLEN / 2) - 1]; 680 } 681 682 static const struct dsa_device_ops sja1105_netdev_ops = { 683 .name = "sja1105", 684 .proto = DSA_TAG_PROTO_SJA1105, 685 .xmit = sja1105_xmit, 686 .rcv = sja1105_rcv, 687 .needed_headroom = VLAN_HLEN, 688 .flow_dissect = sja1105_flow_dissect, 689 .promisc_on_master = true, 690 }; 691 692 DSA_TAG_DRIVER(sja1105_netdev_ops); 693 MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_SJA1105); 694 695 static const struct dsa_device_ops sja1110_netdev_ops = { 696 .name = "sja1110", 697 .proto = DSA_TAG_PROTO_SJA1110, 698 .xmit = sja1110_xmit, 699 .rcv = sja1110_rcv, 700 .flow_dissect = sja1110_flow_dissect, 701 .needed_headroom = SJA1110_HEADER_LEN + VLAN_HLEN, 702 .needed_tailroom = SJA1110_RX_TRAILER_LEN + SJA1110_MAX_PADDING_LEN, 703 }; 704 705 DSA_TAG_DRIVER(sja1110_netdev_ops); 706 MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_SJA1110); 707 708 static struct dsa_tag_driver *sja1105_tag_driver_array[] = { 709 &DSA_TAG_DRIVER_NAME(sja1105_netdev_ops), 710 &DSA_TAG_DRIVER_NAME(sja1110_netdev_ops), 711 }; 712 713 module_dsa_tag_drivers(sja1105_tag_driver_array); 714 715 MODULE_LICENSE("GPL v2"); 716