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 static bool sja1105_can_use_vlan_as_tags(const struct sk_buff *skb) 119 { 120 struct vlan_ethhdr *hdr = vlan_eth_hdr(skb); 121 u16 vlan_tci; 122 123 if (hdr->h_vlan_proto == htons(ETH_P_SJA1105)) 124 return true; 125 126 if (hdr->h_vlan_proto != htons(ETH_P_8021Q) && 127 !skb_vlan_tag_present(skb)) 128 return false; 129 130 if (skb_vlan_tag_present(skb)) 131 vlan_tci = skb_vlan_tag_get(skb); 132 else 133 vlan_tci = ntohs(hdr->h_vlan_TCI); 134 135 return vid_is_dsa_8021q(vlan_tci & VLAN_VID_MASK); 136 } 137 138 /* This is the first time the tagger sees the frame on RX. 139 * Figure out if we can decode it. 140 */ 141 static bool sja1105_filter(const struct sk_buff *skb, struct net_device *dev) 142 { 143 if (sja1105_can_use_vlan_as_tags(skb)) 144 return true; 145 if (sja1105_is_link_local(skb)) 146 return true; 147 if (sja1105_is_meta_frame(skb)) 148 return true; 149 return false; 150 } 151 152 /* Calls sja1105_port_deferred_xmit in sja1105_main.c */ 153 static struct sk_buff *sja1105_defer_xmit(struct sja1105_port *sp, 154 struct sk_buff *skb) 155 { 156 /* Increase refcount so the kfree_skb in dsa_slave_xmit 157 * won't really free the packet. 158 */ 159 skb_queue_tail(&sp->xmit_queue, skb_get(skb)); 160 kthread_queue_work(sp->xmit_worker, &sp->xmit_work); 161 162 return NULL; 163 } 164 165 static u16 sja1105_xmit_tpid(struct sja1105_port *sp) 166 { 167 return sp->xmit_tpid; 168 } 169 170 static struct sk_buff *sja1105_xmit(struct sk_buff *skb, 171 struct net_device *netdev) 172 { 173 struct dsa_port *dp = dsa_slave_to_port(netdev); 174 u16 tx_vid = dsa_8021q_tx_vid(dp->ds, dp->index); 175 u16 queue_mapping = skb_get_queue_mapping(skb); 176 u8 pcp = netdev_txq_to_tc(netdev, queue_mapping); 177 178 /* Transmitting management traffic does not rely upon switch tagging, 179 * but instead SPI-installed management routes. Part 2 of this 180 * is the .port_deferred_xmit driver callback. 181 */ 182 if (unlikely(sja1105_is_link_local(skb))) 183 return sja1105_defer_xmit(dp->priv, skb); 184 185 return dsa_8021q_xmit(skb, netdev, sja1105_xmit_tpid(dp->priv), 186 ((pcp << VLAN_PRIO_SHIFT) | tx_vid)); 187 } 188 189 static struct sk_buff *sja1110_xmit(struct sk_buff *skb, 190 struct net_device *netdev) 191 { 192 struct sk_buff *clone = SJA1105_SKB_CB(skb)->clone; 193 struct dsa_port *dp = dsa_slave_to_port(netdev); 194 u16 tx_vid = dsa_8021q_tx_vid(dp->ds, dp->index); 195 u16 queue_mapping = skb_get_queue_mapping(skb); 196 u8 pcp = netdev_txq_to_tc(netdev, queue_mapping); 197 struct ethhdr *eth_hdr; 198 __be32 *tx_trailer; 199 __be16 *tx_header; 200 int trailer_pos; 201 202 /* Transmitting control packets is done using in-band control 203 * extensions, while data packets are transmitted using 204 * tag_8021q TX VLANs. 205 */ 206 if (likely(!sja1105_is_link_local(skb))) 207 return dsa_8021q_xmit(skb, netdev, sja1105_xmit_tpid(dp->priv), 208 ((pcp << VLAN_PRIO_SHIFT) | tx_vid)); 209 210 skb_push(skb, SJA1110_HEADER_LEN); 211 212 /* Move Ethernet header to the left, making space for DSA tag */ 213 memmove(skb->data, skb->data + SJA1110_HEADER_LEN, 2 * ETH_ALEN); 214 215 trailer_pos = skb->len; 216 217 /* On TX, skb->data points to skb_mac_header(skb) */ 218 eth_hdr = (struct ethhdr *)skb->data; 219 tx_header = (__be16 *)(eth_hdr + 1); 220 tx_trailer = skb_put(skb, SJA1110_TX_TRAILER_LEN); 221 222 eth_hdr->h_proto = htons(ETH_P_SJA1110); 223 224 *tx_header = htons(SJA1110_HEADER_HOST_TO_SWITCH | 225 SJA1110_TX_HEADER_HAS_TRAILER | 226 SJA1110_TX_HEADER_TRAILER_POS(trailer_pos)); 227 *tx_trailer = cpu_to_be32(SJA1110_TX_TRAILER_PRIO(pcp) | 228 SJA1110_TX_TRAILER_SWITCHID(dp->ds->index) | 229 SJA1110_TX_TRAILER_DESTPORTS(BIT(dp->index))); 230 if (clone) { 231 u8 ts_id = SJA1105_SKB_CB(clone)->ts_id; 232 233 *tx_header |= htons(SJA1110_TX_HEADER_TAKE_TS); 234 *tx_trailer |= cpu_to_be32(SJA1110_TX_TRAILER_TSTAMP_ID(ts_id)); 235 } 236 237 return skb; 238 } 239 240 static void sja1105_transfer_meta(struct sk_buff *skb, 241 const struct sja1105_meta *meta) 242 { 243 struct ethhdr *hdr = eth_hdr(skb); 244 245 hdr->h_dest[3] = meta->dmac_byte_3; 246 hdr->h_dest[4] = meta->dmac_byte_4; 247 SJA1105_SKB_CB(skb)->tstamp = meta->tstamp; 248 } 249 250 /* This is a simple state machine which follows the hardware mechanism of 251 * generating RX timestamps: 252 * 253 * After each timestampable skb (all traffic for which send_meta1 and 254 * send_meta0 is true, aka all MAC-filtered link-local traffic) a meta frame 255 * containing a partial timestamp is immediately generated by the switch and 256 * sent as a follow-up to the link-local frame on the CPU port. 257 * 258 * The meta frames have no unique identifier (such as sequence number) by which 259 * one may pair them to the correct timestampable frame. 260 * Instead, the switch has internal logic that ensures no frames are sent on 261 * the CPU port between a link-local timestampable frame and its corresponding 262 * meta follow-up. It also ensures strict ordering between ports (lower ports 263 * have higher priority towards the CPU port). For this reason, a per-port 264 * data structure is not needed/desirable. 265 * 266 * This function pairs the link-local frame with its partial timestamp from the 267 * meta follow-up frame. The full timestamp will be reconstructed later in a 268 * work queue. 269 */ 270 static struct sk_buff 271 *sja1105_rcv_meta_state_machine(struct sk_buff *skb, 272 struct sja1105_meta *meta, 273 bool is_link_local, 274 bool is_meta) 275 { 276 struct sja1105_port *sp; 277 struct dsa_port *dp; 278 279 dp = dsa_slave_to_port(skb->dev); 280 sp = dp->priv; 281 282 /* Step 1: A timestampable frame was received. 283 * Buffer it until we get its meta frame. 284 */ 285 if (is_link_local) { 286 if (!test_bit(SJA1105_HWTS_RX_EN, &sp->data->state)) 287 /* Do normal processing. */ 288 return skb; 289 290 spin_lock(&sp->data->meta_lock); 291 /* Was this a link-local frame instead of the meta 292 * that we were expecting? 293 */ 294 if (sp->data->stampable_skb) { 295 dev_err_ratelimited(dp->ds->dev, 296 "Expected meta frame, is %12llx " 297 "in the DSA master multicast filter?\n", 298 SJA1105_META_DMAC); 299 kfree_skb(sp->data->stampable_skb); 300 } 301 302 /* Hold a reference to avoid dsa_switch_rcv 303 * from freeing the skb. 304 */ 305 sp->data->stampable_skb = skb_get(skb); 306 spin_unlock(&sp->data->meta_lock); 307 308 /* Tell DSA we got nothing */ 309 return NULL; 310 311 /* Step 2: The meta frame arrived. 312 * Time to take the stampable skb out of the closet, annotate it 313 * with the partial timestamp, and pretend that we received it 314 * just now (basically masquerade the buffered frame as the meta 315 * frame, which serves no further purpose). 316 */ 317 } else if (is_meta) { 318 struct sk_buff *stampable_skb; 319 320 /* Drop the meta frame if we're not in the right state 321 * to process it. 322 */ 323 if (!test_bit(SJA1105_HWTS_RX_EN, &sp->data->state)) 324 return NULL; 325 326 spin_lock(&sp->data->meta_lock); 327 328 stampable_skb = sp->data->stampable_skb; 329 sp->data->stampable_skb = NULL; 330 331 /* Was this a meta frame instead of the link-local 332 * that we were expecting? 333 */ 334 if (!stampable_skb) { 335 dev_err_ratelimited(dp->ds->dev, 336 "Unexpected meta frame\n"); 337 spin_unlock(&sp->data->meta_lock); 338 return NULL; 339 } 340 341 if (stampable_skb->dev != skb->dev) { 342 dev_err_ratelimited(dp->ds->dev, 343 "Meta frame on wrong port\n"); 344 spin_unlock(&sp->data->meta_lock); 345 return NULL; 346 } 347 348 /* Free the meta frame and give DSA the buffered stampable_skb 349 * for further processing up the network stack. 350 */ 351 kfree_skb(skb); 352 skb = stampable_skb; 353 sja1105_transfer_meta(skb, meta); 354 355 spin_unlock(&sp->data->meta_lock); 356 } 357 358 return skb; 359 } 360 361 static void sja1105_decode_subvlan(struct sk_buff *skb, u16 subvlan) 362 { 363 struct dsa_port *dp = dsa_slave_to_port(skb->dev); 364 struct sja1105_port *sp = dp->priv; 365 u16 vid = sp->subvlan_map[subvlan]; 366 u16 vlan_tci; 367 368 if (vid == VLAN_N_VID) 369 return; 370 371 vlan_tci = (skb->priority << VLAN_PRIO_SHIFT) | vid; 372 __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), vlan_tci); 373 } 374 375 static bool sja1105_skb_has_tag_8021q(const struct sk_buff *skb) 376 { 377 u16 tpid = ntohs(eth_hdr(skb)->h_proto); 378 379 return tpid == ETH_P_SJA1105 || tpid == ETH_P_8021Q || 380 skb_vlan_tag_present(skb); 381 } 382 383 static bool sja1110_skb_has_inband_control_extension(const struct sk_buff *skb) 384 { 385 return ntohs(eth_hdr(skb)->h_proto) == ETH_P_SJA1110; 386 } 387 388 static struct sk_buff *sja1105_rcv(struct sk_buff *skb, 389 struct net_device *netdev, 390 struct packet_type *pt) 391 { 392 int source_port, switch_id, subvlan = 0; 393 struct sja1105_meta meta = {0}; 394 struct ethhdr *hdr; 395 bool is_link_local; 396 bool is_meta; 397 398 hdr = eth_hdr(skb); 399 is_link_local = sja1105_is_link_local(skb); 400 is_meta = sja1105_is_meta_frame(skb); 401 402 skb->offload_fwd_mark = 1; 403 404 if (sja1105_skb_has_tag_8021q(skb)) { 405 /* Normal traffic path. */ 406 dsa_8021q_rcv(skb, &source_port, &switch_id, &subvlan); 407 } else if (is_link_local) { 408 /* Management traffic path. Switch embeds the switch ID and 409 * port ID into bytes of the destination MAC, courtesy of 410 * the incl_srcpt options. 411 */ 412 source_port = hdr->h_dest[3]; 413 switch_id = hdr->h_dest[4]; 414 /* Clear the DMAC bytes that were mangled by the switch */ 415 hdr->h_dest[3] = 0; 416 hdr->h_dest[4] = 0; 417 } else if (is_meta) { 418 sja1105_meta_unpack(skb, &meta); 419 source_port = meta.source_port; 420 switch_id = meta.switch_id; 421 } else { 422 return NULL; 423 } 424 425 skb->dev = dsa_master_find_slave(netdev, switch_id, source_port); 426 if (!skb->dev) { 427 netdev_warn(netdev, "Couldn't decode source port\n"); 428 return NULL; 429 } 430 431 if (subvlan) 432 sja1105_decode_subvlan(skb, subvlan); 433 434 return sja1105_rcv_meta_state_machine(skb, &meta, is_link_local, 435 is_meta); 436 } 437 438 static struct sk_buff *sja1110_rcv_meta(struct sk_buff *skb, u16 rx_header) 439 { 440 int switch_id = SJA1110_RX_HEADER_SWITCH_ID(rx_header); 441 int n_ts = SJA1110_RX_HEADER_N_TS(rx_header); 442 struct net_device *master = skb->dev; 443 struct dsa_port *cpu_dp; 444 u8 *buf = skb->data + 2; 445 struct dsa_switch *ds; 446 int i; 447 448 cpu_dp = master->dsa_ptr; 449 ds = dsa_switch_find(cpu_dp->dst->index, switch_id); 450 if (!ds) { 451 net_err_ratelimited("%s: cannot find switch id %d\n", 452 master->name, switch_id); 453 return NULL; 454 } 455 456 for (i = 0; i <= n_ts; i++) { 457 u8 ts_id, source_port, dir; 458 u64 tstamp; 459 460 ts_id = buf[0]; 461 source_port = (buf[1] & GENMASK(7, 4)) >> 4; 462 dir = (buf[1] & BIT(3)) >> 3; 463 tstamp = be64_to_cpu(*(__be64 *)(buf + 2)); 464 465 sja1110_process_meta_tstamp(ds, source_port, ts_id, dir, 466 tstamp); 467 468 buf += SJA1110_META_TSTAMP_SIZE; 469 } 470 471 /* Discard the meta frame, we've consumed the timestamps it contained */ 472 return NULL; 473 } 474 475 static struct sk_buff *sja1110_rcv_inband_control_extension(struct sk_buff *skb, 476 int *source_port, 477 int *switch_id) 478 { 479 u16 rx_header; 480 481 if (unlikely(!pskb_may_pull(skb, SJA1110_HEADER_LEN))) 482 return NULL; 483 484 /* skb->data points to skb_mac_header(skb) + ETH_HLEN, which is exactly 485 * what we need because the caller has checked the EtherType (which is 486 * located 2 bytes back) and we just need a pointer to the header that 487 * comes afterwards. 488 */ 489 rx_header = ntohs(*(__be16 *)skb->data); 490 491 if (rx_header & SJA1110_RX_HEADER_IS_METADATA) 492 return sja1110_rcv_meta(skb, rx_header); 493 494 /* Timestamp frame, we have a trailer */ 495 if (rx_header & SJA1110_RX_HEADER_HAS_TRAILER) { 496 int start_of_padding = SJA1110_RX_HEADER_TRAILER_POS(rx_header); 497 u8 *rx_trailer = skb_tail_pointer(skb) - SJA1110_RX_TRAILER_LEN; 498 u64 *tstamp = &SJA1105_SKB_CB(skb)->tstamp; 499 u8 last_byte = rx_trailer[12]; 500 501 /* The timestamp is unaligned, so we need to use packing() 502 * to get it 503 */ 504 packing(rx_trailer, tstamp, 63, 0, 8, UNPACK, 0); 505 506 *source_port = SJA1110_RX_TRAILER_SRC_PORT(last_byte); 507 *switch_id = SJA1110_RX_TRAILER_SWITCH_ID(last_byte); 508 509 /* skb->len counts from skb->data, while start_of_padding 510 * counts from the destination MAC address. Right now skb->data 511 * is still as set by the DSA master, so to trim away the 512 * padding and trailer we need to account for the fact that 513 * skb->data points to skb_mac_header(skb) + ETH_HLEN. 514 */ 515 pskb_trim_rcsum(skb, start_of_padding - ETH_HLEN); 516 /* Trap-to-host frame, no timestamp trailer */ 517 } else { 518 *source_port = SJA1110_RX_HEADER_SRC_PORT(rx_header); 519 *switch_id = SJA1110_RX_HEADER_SWITCH_ID(rx_header); 520 } 521 522 /* Advance skb->data past the DSA header */ 523 skb_pull_rcsum(skb, SJA1110_HEADER_LEN); 524 525 /* Remove the DSA header */ 526 memmove(skb->data - ETH_HLEN, skb->data - ETH_HLEN - SJA1110_HEADER_LEN, 527 2 * ETH_ALEN); 528 529 /* With skb->data in its final place, update the MAC header 530 * so that eth_hdr() continues to works properly. 531 */ 532 skb_set_mac_header(skb, -ETH_HLEN); 533 534 return skb; 535 } 536 537 static struct sk_buff *sja1110_rcv(struct sk_buff *skb, 538 struct net_device *netdev, 539 struct packet_type *pt) 540 { 541 int source_port = -1, switch_id = -1, subvlan = 0; 542 543 skb->offload_fwd_mark = 1; 544 545 if (sja1110_skb_has_inband_control_extension(skb)) { 546 skb = sja1110_rcv_inband_control_extension(skb, &source_port, 547 &switch_id); 548 if (!skb) 549 return NULL; 550 } 551 552 /* Packets with in-band control extensions might still have RX VLANs */ 553 if (likely(sja1105_skb_has_tag_8021q(skb))) 554 dsa_8021q_rcv(skb, &source_port, &switch_id, &subvlan); 555 556 skb->dev = dsa_master_find_slave(netdev, switch_id, source_port); 557 if (!skb->dev) { 558 netdev_warn(netdev, 559 "Couldn't decode source port %d and switch id %d\n", 560 source_port, switch_id); 561 return NULL; 562 } 563 564 if (subvlan) 565 sja1105_decode_subvlan(skb, subvlan); 566 567 return skb; 568 } 569 570 static void sja1105_flow_dissect(const struct sk_buff *skb, __be16 *proto, 571 int *offset) 572 { 573 /* No tag added for management frames, all ok */ 574 if (unlikely(sja1105_is_link_local(skb))) 575 return; 576 577 dsa_tag_generic_flow_dissect(skb, proto, offset); 578 } 579 580 static void sja1110_flow_dissect(const struct sk_buff *skb, __be16 *proto, 581 int *offset) 582 { 583 /* Management frames have 2 DSA tags on RX, so the needed_headroom we 584 * declared is fine for the generic dissector adjustment procedure. 585 */ 586 if (unlikely(sja1105_is_link_local(skb))) 587 return dsa_tag_generic_flow_dissect(skb, proto, offset); 588 589 /* For the rest, there is a single DSA tag, the tag_8021q one */ 590 *offset = VLAN_HLEN; 591 *proto = ((__be16 *)skb->data)[(VLAN_HLEN / 2) - 1]; 592 } 593 594 static const struct dsa_device_ops sja1105_netdev_ops = { 595 .name = "sja1105", 596 .proto = DSA_TAG_PROTO_SJA1105, 597 .xmit = sja1105_xmit, 598 .rcv = sja1105_rcv, 599 .filter = sja1105_filter, 600 .needed_headroom = VLAN_HLEN, 601 .flow_dissect = sja1105_flow_dissect, 602 .promisc_on_master = true, 603 }; 604 605 DSA_TAG_DRIVER(sja1105_netdev_ops); 606 MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_SJA1105); 607 608 static const struct dsa_device_ops sja1110_netdev_ops = { 609 .name = "sja1110", 610 .proto = DSA_TAG_PROTO_SJA1110, 611 .xmit = sja1110_xmit, 612 .rcv = sja1110_rcv, 613 .filter = sja1105_filter, 614 .flow_dissect = sja1110_flow_dissect, 615 .needed_headroom = SJA1110_HEADER_LEN + VLAN_HLEN, 616 .needed_tailroom = SJA1110_RX_TRAILER_LEN + SJA1110_MAX_PADDING_LEN, 617 }; 618 619 DSA_TAG_DRIVER(sja1110_netdev_ops); 620 MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_SJA1110); 621 622 static struct dsa_tag_driver *sja1105_tag_driver_array[] = { 623 &DSA_TAG_DRIVER_NAME(sja1105_netdev_ops), 624 &DSA_TAG_DRIVER_NAME(sja1110_netdev_ops), 625 }; 626 627 module_dsa_tag_drivers(sja1105_tag_driver_array); 628 629 MODULE_LICENSE("GPL v2"); 630