1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright (c) 2019, Vladimir Oltean <olteanv@gmail.com>
4 #include <linux/if_vlan.h>
5 #include <linux/dsa/sja1105.h>
6 #include <linux/dsa/8021q.h>
7 #include <linux/packing.h>
10 /* Is this a TX or an RX header? */
11 #define SJA1110_HEADER_HOST_TO_SWITCH BIT(15)
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)
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))
22 /* Timestamp format (trailer present) */
23 #define SJA1110_RX_HEADER_TRAILER_POS(x) ((x) & GENMASK(11, 0))
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))
28 /* Meta frame format (for 2-step TX timestamps) */
29 #define SJA1110_RX_HEADER_N_TS(x) (((x) & GENMASK(8, 4)) >> 4)
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)
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))
41 /* Only valid if SJA1110_TX_HEADER_HAS_TRAILER is true */
42 #define SJA1110_TX_HEADER_TRAILER_POS(x) ((x) & GENMASK(10, 0))
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))
49 #define SJA1110_META_TSTAMP_SIZE 10
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
56 struct sja1105_tagger_private {
57 struct sja1105_tagger_data data; /* Must be first */
58 /* Protects concurrent access to the meta state machine
59 * from taggers running on multiple ports on SMP systems
62 struct sk_buff *stampable_skb;
63 struct kthread_worker *xmit_worker;
66 static struct sja1105_tagger_private *
67 sja1105_tagger_private(struct dsa_switch *ds)
69 return ds->tagger_data;
72 /* Similar to is_link_local_ether_addr(hdr->h_dest) but also covers PTP */
73 static inline bool sja1105_is_link_local(const struct sk_buff *skb)
75 const struct ethhdr *hdr = eth_hdr(skb);
76 u64 dmac = ether_addr_to_u64(hdr->h_dest);
78 if (ntohs(hdr->h_proto) == ETH_P_SJA1105_META)
80 if ((dmac & SJA1105_LINKLOCAL_FILTER_A_MASK) ==
81 SJA1105_LINKLOCAL_FILTER_A)
83 if ((dmac & SJA1105_LINKLOCAL_FILTER_B_MASK) ==
84 SJA1105_LINKLOCAL_FILTER_B)
97 static void sja1105_meta_unpack(const struct sk_buff *skb,
98 struct sja1105_meta *meta)
100 u8 *buf = skb_mac_header(skb) + ETH_HLEN;
102 /* UM10944.pdf section 4.2.17 AVB Parameters:
103 * Structure of the meta-data follow-up frame.
104 * It is in network byte order, so there are no quirks
105 * while unpacking the meta frame.
107 * Also SJA1105 E/T only populates bits 23:0 of the timestamp
108 * whereas P/Q/R/S does 32 bits. Since the structure is the
109 * same and the E/T puts zeroes in the high-order byte, use
110 * a unified unpacking command for both device series.
112 packing(buf, &meta->tstamp, 31, 0, 4, UNPACK, 0);
113 packing(buf + 4, &meta->dmac_byte_3, 7, 0, 1, UNPACK, 0);
114 packing(buf + 5, &meta->dmac_byte_4, 7, 0, 1, UNPACK, 0);
115 packing(buf + 6, &meta->source_port, 7, 0, 1, UNPACK, 0);
116 packing(buf + 7, &meta->switch_id, 7, 0, 1, UNPACK, 0);
119 static inline bool sja1105_is_meta_frame(const struct sk_buff *skb)
121 const struct ethhdr *hdr = eth_hdr(skb);
122 u64 smac = ether_addr_to_u64(hdr->h_source);
123 u64 dmac = ether_addr_to_u64(hdr->h_dest);
125 if (smac != SJA1105_META_SMAC)
127 if (dmac != SJA1105_META_DMAC)
129 if (ntohs(hdr->h_proto) != ETH_P_SJA1105_META)
134 /* Calls sja1105_port_deferred_xmit in sja1105_main.c */
135 static struct sk_buff *sja1105_defer_xmit(struct dsa_port *dp,
138 struct sja1105_tagger_data *tagger_data = sja1105_tagger_data(dp->ds);
139 struct sja1105_tagger_private *priv = sja1105_tagger_private(dp->ds);
140 void (*xmit_work_fn)(struct kthread_work *work);
141 struct sja1105_deferred_xmit_work *xmit_work;
142 struct kthread_worker *xmit_worker;
144 xmit_work_fn = tagger_data->xmit_work_fn;
145 xmit_worker = priv->xmit_worker;
147 if (!xmit_work_fn || !xmit_worker)
150 xmit_work = kzalloc(sizeof(*xmit_work), GFP_ATOMIC);
154 kthread_init_work(&xmit_work->work, xmit_work_fn);
155 /* Increase refcount so the kfree_skb in dsa_slave_xmit
156 * won't really free the packet.
159 xmit_work->skb = skb_get(skb);
161 kthread_queue_work(xmit_worker, &xmit_work->work);
166 /* Send VLAN tags with a TPID that blends in with whatever VLAN protocol a
167 * bridge spanning ports of this switch might have.
169 static u16 sja1105_xmit_tpid(struct dsa_port *dp)
171 struct dsa_switch *ds = dp->ds;
172 struct dsa_port *other_dp;
175 /* Since VLAN awareness is global, then if this port is VLAN-unaware,
176 * all ports are. Use the VLAN-unaware TPID used for tag_8021q.
178 if (!dsa_port_is_vlan_filtering(dp))
179 return ETH_P_SJA1105;
181 /* Port is VLAN-aware, so there is a bridge somewhere (a single one,
182 * we're sure about that). It may not be on this port though, so we
185 dsa_switch_for_each_port(other_dp, ds) {
186 struct net_device *br = dsa_port_bridge_dev_get(other_dp);
191 /* Error is returned only if CONFIG_BRIDGE_VLAN_FILTERING,
192 * which seems pointless to handle, as our port cannot become
193 * VLAN-aware in that case.
195 br_vlan_get_proto(br, &proto);
200 WARN_ONCE(1, "Port is VLAN-aware but cannot find associated bridge!\n");
202 return ETH_P_SJA1105;
205 static struct sk_buff *sja1105_imprecise_xmit(struct sk_buff *skb,
206 struct net_device *netdev)
208 struct dsa_port *dp = dsa_slave_to_port(netdev);
209 unsigned int bridge_num = dsa_port_bridge_num_get(dp);
210 struct net_device *br = dsa_port_bridge_dev_get(dp);
213 /* If the port is under a VLAN-aware bridge, just slide the
214 * VLAN-tagged packet into the FDB and hope for the best.
215 * This works because we support a single VLAN-aware bridge
216 * across the entire dst, and its VLANs cannot be shared with
217 * any standalone port.
219 if (br_vlan_enabled(br))
222 /* If the port is under a VLAN-unaware bridge, use an imprecise
223 * TX VLAN that targets the bridge's entire broadcast domain,
224 * instead of just the specific port.
226 tx_vid = dsa_tag_8021q_bridge_vid(bridge_num);
228 return dsa_8021q_xmit(skb, netdev, sja1105_xmit_tpid(dp), tx_vid);
231 /* Transform untagged control packets into pvid-tagged control packets so that
232 * all packets sent by this tagger are VLAN-tagged and we can configure the
233 * switch to drop untagged packets coming from the DSA master.
235 static struct sk_buff *sja1105_pvid_tag_control_pkt(struct dsa_port *dp,
236 struct sk_buff *skb, u8 pcp)
238 __be16 xmit_tpid = htons(sja1105_xmit_tpid(dp));
239 struct vlan_ethhdr *hdr;
241 /* If VLAN tag is in hwaccel area, move it to the payload
242 * to deal with both cases uniformly and to ensure that
243 * the VLANs are added in the right order.
245 if (unlikely(skb_vlan_tag_present(skb))) {
246 skb = __vlan_hwaccel_push_inside(skb);
251 hdr = (struct vlan_ethhdr *)skb_mac_header(skb);
253 /* If skb is already VLAN-tagged, leave that VLAN ID in place */
254 if (hdr->h_vlan_proto == xmit_tpid)
257 return vlan_insert_tag(skb, xmit_tpid, (pcp << VLAN_PRIO_SHIFT) |
258 SJA1105_DEFAULT_VLAN);
261 static struct sk_buff *sja1105_xmit(struct sk_buff *skb,
262 struct net_device *netdev)
264 struct dsa_port *dp = dsa_slave_to_port(netdev);
265 u16 queue_mapping = skb_get_queue_mapping(skb);
266 u8 pcp = netdev_txq_to_tc(netdev, queue_mapping);
267 u16 tx_vid = dsa_tag_8021q_standalone_vid(dp);
269 if (skb->offload_fwd_mark)
270 return sja1105_imprecise_xmit(skb, netdev);
272 /* Transmitting management traffic does not rely upon switch tagging,
273 * but instead SPI-installed management routes. Part 2 of this
274 * is the .port_deferred_xmit driver callback.
276 if (unlikely(sja1105_is_link_local(skb))) {
277 skb = sja1105_pvid_tag_control_pkt(dp, skb, pcp);
281 return sja1105_defer_xmit(dp, skb);
284 return dsa_8021q_xmit(skb, netdev, sja1105_xmit_tpid(dp),
285 ((pcp << VLAN_PRIO_SHIFT) | tx_vid));
288 static struct sk_buff *sja1110_xmit(struct sk_buff *skb,
289 struct net_device *netdev)
291 struct sk_buff *clone = SJA1105_SKB_CB(skb)->clone;
292 struct dsa_port *dp = dsa_slave_to_port(netdev);
293 u16 queue_mapping = skb_get_queue_mapping(skb);
294 u8 pcp = netdev_txq_to_tc(netdev, queue_mapping);
295 u16 tx_vid = dsa_tag_8021q_standalone_vid(dp);
300 if (skb->offload_fwd_mark)
301 return sja1105_imprecise_xmit(skb, netdev);
303 /* Transmitting control packets is done using in-band control
304 * extensions, while data packets are transmitted using
305 * tag_8021q TX VLANs.
307 if (likely(!sja1105_is_link_local(skb)))
308 return dsa_8021q_xmit(skb, netdev, sja1105_xmit_tpid(dp),
309 ((pcp << VLAN_PRIO_SHIFT) | tx_vid));
311 skb = sja1105_pvid_tag_control_pkt(dp, skb, pcp);
315 skb_push(skb, SJA1110_HEADER_LEN);
317 dsa_alloc_etype_header(skb, SJA1110_HEADER_LEN);
319 trailer_pos = skb->len;
321 tx_header = dsa_etype_header_pos_tx(skb);
322 tx_trailer = skb_put(skb, SJA1110_TX_TRAILER_LEN);
324 tx_header[0] = htons(ETH_P_SJA1110);
325 tx_header[1] = htons(SJA1110_HEADER_HOST_TO_SWITCH |
326 SJA1110_TX_HEADER_HAS_TRAILER |
327 SJA1110_TX_HEADER_TRAILER_POS(trailer_pos));
328 *tx_trailer = cpu_to_be32(SJA1110_TX_TRAILER_PRIO(pcp) |
329 SJA1110_TX_TRAILER_SWITCHID(dp->ds->index) |
330 SJA1110_TX_TRAILER_DESTPORTS(BIT(dp->index)));
332 u8 ts_id = SJA1105_SKB_CB(clone)->ts_id;
334 tx_header[1] |= htons(SJA1110_TX_HEADER_TAKE_TS);
335 *tx_trailer |= cpu_to_be32(SJA1110_TX_TRAILER_TSTAMP_ID(ts_id));
341 static void sja1105_transfer_meta(struct sk_buff *skb,
342 const struct sja1105_meta *meta)
344 struct ethhdr *hdr = eth_hdr(skb);
346 hdr->h_dest[3] = meta->dmac_byte_3;
347 hdr->h_dest[4] = meta->dmac_byte_4;
348 SJA1105_SKB_CB(skb)->tstamp = meta->tstamp;
351 /* This is a simple state machine which follows the hardware mechanism of
352 * generating RX timestamps:
354 * After each timestampable skb (all traffic for which send_meta1 and
355 * send_meta0 is true, aka all MAC-filtered link-local traffic) a meta frame
356 * containing a partial timestamp is immediately generated by the switch and
357 * sent as a follow-up to the link-local frame on the CPU port.
359 * The meta frames have no unique identifier (such as sequence number) by which
360 * one may pair them to the correct timestampable frame.
361 * Instead, the switch has internal logic that ensures no frames are sent on
362 * the CPU port between a link-local timestampable frame and its corresponding
363 * meta follow-up. It also ensures strict ordering between ports (lower ports
364 * have higher priority towards the CPU port). For this reason, a per-port
365 * data structure is not needed/desirable.
367 * This function pairs the link-local frame with its partial timestamp from the
368 * meta follow-up frame. The full timestamp will be reconstructed later in a
371 static struct sk_buff
372 *sja1105_rcv_meta_state_machine(struct sk_buff *skb,
373 struct sja1105_meta *meta,
377 /* Step 1: A timestampable frame was received.
378 * Buffer it until we get its meta frame.
381 struct dsa_port *dp = dsa_slave_to_port(skb->dev);
382 struct sja1105_tagger_private *priv;
383 struct dsa_switch *ds = dp->ds;
385 priv = sja1105_tagger_private(ds);
387 spin_lock(&priv->meta_lock);
388 /* Was this a link-local frame instead of the meta
389 * that we were expecting?
391 if (priv->stampable_skb) {
392 dev_err_ratelimited(ds->dev,
393 "Expected meta frame, is %12llx "
394 "in the DSA master multicast filter?\n",
396 kfree_skb(priv->stampable_skb);
399 /* Hold a reference to avoid dsa_switch_rcv
400 * from freeing the skb.
402 priv->stampable_skb = skb_get(skb);
403 spin_unlock(&priv->meta_lock);
405 /* Tell DSA we got nothing */
408 /* Step 2: The meta frame arrived.
409 * Time to take the stampable skb out of the closet, annotate it
410 * with the partial timestamp, and pretend that we received it
411 * just now (basically masquerade the buffered frame as the meta
412 * frame, which serves no further purpose).
414 } else if (is_meta) {
415 struct dsa_port *dp = dsa_slave_to_port(skb->dev);
416 struct sja1105_tagger_private *priv;
417 struct dsa_switch *ds = dp->ds;
418 struct sk_buff *stampable_skb;
420 priv = sja1105_tagger_private(ds);
422 spin_lock(&priv->meta_lock);
424 stampable_skb = priv->stampable_skb;
425 priv->stampable_skb = NULL;
427 /* Was this a meta frame instead of the link-local
428 * that we were expecting?
430 if (!stampable_skb) {
431 dev_err_ratelimited(ds->dev,
432 "Unexpected meta frame\n");
433 spin_unlock(&priv->meta_lock);
437 if (stampable_skb->dev != skb->dev) {
438 dev_err_ratelimited(ds->dev,
439 "Meta frame on wrong port\n");
440 spin_unlock(&priv->meta_lock);
444 /* Free the meta frame and give DSA the buffered stampable_skb
445 * for further processing up the network stack.
449 sja1105_transfer_meta(skb, meta);
451 spin_unlock(&priv->meta_lock);
457 static bool sja1105_skb_has_tag_8021q(const struct sk_buff *skb)
459 u16 tpid = ntohs(eth_hdr(skb)->h_proto);
461 return tpid == ETH_P_SJA1105 || tpid == ETH_P_8021Q ||
462 skb_vlan_tag_present(skb);
465 static bool sja1110_skb_has_inband_control_extension(const struct sk_buff *skb)
467 return ntohs(eth_hdr(skb)->h_proto) == ETH_P_SJA1110;
470 /* If the VLAN in the packet is a tag_8021q one, set @source_port and
471 * @switch_id and strip the header. Otherwise set @vid and keep it in the
474 static void sja1105_vlan_rcv(struct sk_buff *skb, int *source_port,
475 int *switch_id, int *vbid, u16 *vid)
477 struct vlan_ethhdr *hdr = (struct vlan_ethhdr *)skb_mac_header(skb);
480 if (skb_vlan_tag_present(skb))
481 vlan_tci = skb_vlan_tag_get(skb);
483 vlan_tci = ntohs(hdr->h_vlan_TCI);
485 if (vid_is_dsa_8021q(vlan_tci & VLAN_VID_MASK))
486 return dsa_8021q_rcv(skb, source_port, switch_id, vbid);
488 /* Try our best with imprecise RX */
489 *vid = vlan_tci & VLAN_VID_MASK;
492 static struct sk_buff *sja1105_rcv(struct sk_buff *skb,
493 struct net_device *netdev)
495 int source_port = -1, switch_id = -1, vbid = -1;
496 struct sja1105_meta meta = {0};
503 is_link_local = sja1105_is_link_local(skb);
504 is_meta = sja1105_is_meta_frame(skb);
507 /* Management traffic path. Switch embeds the switch ID and
508 * port ID into bytes of the destination MAC, courtesy of
509 * the incl_srcpt options.
511 source_port = hdr->h_dest[3];
512 switch_id = hdr->h_dest[4];
513 } else if (is_meta) {
514 sja1105_meta_unpack(skb, &meta);
515 source_port = meta.source_port;
516 switch_id = meta.switch_id;
519 /* Normal data plane traffic and link-local frames are tagged with
520 * a tag_8021q VLAN which we have to strip
522 if (sja1105_skb_has_tag_8021q(skb)) {
523 int tmp_source_port = -1, tmp_switch_id = -1;
525 sja1105_vlan_rcv(skb, &tmp_source_port, &tmp_switch_id, &vbid,
527 /* Preserve the source information from the INCL_SRCPT option,
528 * if available. This allows us to not overwrite a valid source
529 * port and switch ID with zeroes when receiving link-local
530 * frames from a VLAN-unaware bridged port (non-zero vbid) or a
531 * VLAN-aware bridged port (non-zero vid). Furthermore, the
532 * tag_8021q source port information is only of trust when the
533 * vbid is 0 (precise port). Otherwise, tmp_source_port and
534 * tmp_switch_id will be zeroes.
536 if (vbid == 0 && source_port == -1)
537 source_port = tmp_source_port;
538 if (vbid == 0 && switch_id == -1)
539 switch_id = tmp_switch_id;
540 } else if (source_port == -1 && switch_id == -1) {
541 /* Packets with no source information have no chance of
542 * getting accepted, drop them straight away.
547 if (source_port != -1 && switch_id != -1)
548 skb->dev = dsa_master_find_slave(netdev, switch_id, source_port);
550 skb->dev = dsa_tag_8021q_find_port_by_vbid(netdev, vbid);
552 skb->dev = dsa_find_designated_bridge_port_by_vid(netdev, vid);
554 netdev_warn(netdev, "Couldn't decode source port\n");
559 dsa_default_offload_fwd_mark(skb);
561 return sja1105_rcv_meta_state_machine(skb, &meta, is_link_local,
565 static struct sk_buff *sja1110_rcv_meta(struct sk_buff *skb, u16 rx_header)
567 u8 *buf = dsa_etype_header_pos_rx(skb) + SJA1110_HEADER_LEN;
568 int switch_id = SJA1110_RX_HEADER_SWITCH_ID(rx_header);
569 int n_ts = SJA1110_RX_HEADER_N_TS(rx_header);
570 struct sja1105_tagger_data *tagger_data;
571 struct net_device *master = skb->dev;
572 struct dsa_port *cpu_dp;
573 struct dsa_switch *ds;
576 cpu_dp = master->dsa_ptr;
577 ds = dsa_switch_find(cpu_dp->dst->index, switch_id);
579 net_err_ratelimited("%s: cannot find switch id %d\n",
580 master->name, switch_id);
584 tagger_data = sja1105_tagger_data(ds);
585 if (!tagger_data->meta_tstamp_handler)
588 for (i = 0; i <= n_ts; i++) {
589 u8 ts_id, source_port, dir;
593 source_port = (buf[1] & GENMASK(7, 4)) >> 4;
594 dir = (buf[1] & BIT(3)) >> 3;
595 tstamp = be64_to_cpu(*(__be64 *)(buf + 2));
597 tagger_data->meta_tstamp_handler(ds, source_port, ts_id, dir,
600 buf += SJA1110_META_TSTAMP_SIZE;
603 /* Discard the meta frame, we've consumed the timestamps it contained */
607 static struct sk_buff *sja1110_rcv_inband_control_extension(struct sk_buff *skb,
614 if (unlikely(!pskb_may_pull(skb, SJA1110_HEADER_LEN)))
617 /* skb->data points to skb_mac_header(skb) + ETH_HLEN, which is exactly
618 * what we need because the caller has checked the EtherType (which is
619 * located 2 bytes back) and we just need a pointer to the header that
622 rx_header = ntohs(*(__be16 *)skb->data);
624 if (rx_header & SJA1110_RX_HEADER_HOST_ONLY)
627 if (rx_header & SJA1110_RX_HEADER_IS_METADATA)
628 return sja1110_rcv_meta(skb, rx_header);
630 /* Timestamp frame, we have a trailer */
631 if (rx_header & SJA1110_RX_HEADER_HAS_TRAILER) {
632 int start_of_padding = SJA1110_RX_HEADER_TRAILER_POS(rx_header);
633 u8 *rx_trailer = skb_tail_pointer(skb) - SJA1110_RX_TRAILER_LEN;
634 u64 *tstamp = &SJA1105_SKB_CB(skb)->tstamp;
635 u8 last_byte = rx_trailer[12];
637 /* The timestamp is unaligned, so we need to use packing()
640 packing(rx_trailer, tstamp, 63, 0, 8, UNPACK, 0);
642 *source_port = SJA1110_RX_TRAILER_SRC_PORT(last_byte);
643 *switch_id = SJA1110_RX_TRAILER_SWITCH_ID(last_byte);
645 /* skb->len counts from skb->data, while start_of_padding
646 * counts from the destination MAC address. Right now skb->data
647 * is still as set by the DSA master, so to trim away the
648 * padding and trailer we need to account for the fact that
649 * skb->data points to skb_mac_header(skb) + ETH_HLEN.
651 if (pskb_trim_rcsum(skb, start_of_padding - ETH_HLEN))
653 /* Trap-to-host frame, no timestamp trailer */
655 *source_port = SJA1110_RX_HEADER_SRC_PORT(rx_header);
656 *switch_id = SJA1110_RX_HEADER_SWITCH_ID(rx_header);
659 /* Advance skb->data past the DSA header */
660 skb_pull_rcsum(skb, SJA1110_HEADER_LEN);
662 dsa_strip_etype_header(skb, SJA1110_HEADER_LEN);
664 /* With skb->data in its final place, update the MAC header
665 * so that eth_hdr() continues to works properly.
667 skb_set_mac_header(skb, -ETH_HLEN);
672 static struct sk_buff *sja1110_rcv(struct sk_buff *skb,
673 struct net_device *netdev)
675 int source_port = -1, switch_id = -1, vbid = -1;
676 bool host_only = false;
679 if (sja1110_skb_has_inband_control_extension(skb)) {
680 skb = sja1110_rcv_inband_control_extension(skb, &source_port,
687 /* Packets with in-band control extensions might still have RX VLANs */
688 if (likely(sja1105_skb_has_tag_8021q(skb)))
689 sja1105_vlan_rcv(skb, &source_port, &switch_id, &vbid, &vid);
692 skb->dev = dsa_tag_8021q_find_port_by_vbid(netdev, vbid);
693 else if (source_port == -1 || switch_id == -1)
694 skb->dev = dsa_find_designated_bridge_port_by_vid(netdev, vid);
696 skb->dev = dsa_master_find_slave(netdev, switch_id, source_port);
698 netdev_warn(netdev, "Couldn't decode source port\n");
703 dsa_default_offload_fwd_mark(skb);
708 static void sja1105_flow_dissect(const struct sk_buff *skb, __be16 *proto,
711 /* No tag added for management frames, all ok */
712 if (unlikely(sja1105_is_link_local(skb)))
715 dsa_tag_generic_flow_dissect(skb, proto, offset);
718 static void sja1110_flow_dissect(const struct sk_buff *skb, __be16 *proto,
721 /* Management frames have 2 DSA tags on RX, so the needed_headroom we
722 * declared is fine for the generic dissector adjustment procedure.
724 if (unlikely(sja1105_is_link_local(skb)))
725 return dsa_tag_generic_flow_dissect(skb, proto, offset);
727 /* For the rest, there is a single DSA tag, the tag_8021q one */
729 *proto = ((__be16 *)skb->data)[(VLAN_HLEN / 2) - 1];
732 static void sja1105_disconnect(struct dsa_switch *ds)
734 struct sja1105_tagger_private *priv = ds->tagger_data;
736 kthread_destroy_worker(priv->xmit_worker);
738 ds->tagger_data = NULL;
741 static int sja1105_connect(struct dsa_switch *ds)
743 struct sja1105_tagger_private *priv;
744 struct kthread_worker *xmit_worker;
747 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
751 spin_lock_init(&priv->meta_lock);
753 xmit_worker = kthread_create_worker(0, "dsa%d:%d_xmit",
754 ds->dst->index, ds->index);
755 if (IS_ERR(xmit_worker)) {
756 err = PTR_ERR(xmit_worker);
761 priv->xmit_worker = xmit_worker;
762 ds->tagger_data = priv;
767 static const struct dsa_device_ops sja1105_netdev_ops = {
769 .proto = DSA_TAG_PROTO_SJA1105,
770 .xmit = sja1105_xmit,
772 .connect = sja1105_connect,
773 .disconnect = sja1105_disconnect,
774 .needed_headroom = VLAN_HLEN,
775 .flow_dissect = sja1105_flow_dissect,
776 .promisc_on_master = true,
779 DSA_TAG_DRIVER(sja1105_netdev_ops);
780 MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_SJA1105);
782 static const struct dsa_device_ops sja1110_netdev_ops = {
784 .proto = DSA_TAG_PROTO_SJA1110,
785 .xmit = sja1110_xmit,
787 .connect = sja1105_connect,
788 .disconnect = sja1105_disconnect,
789 .flow_dissect = sja1110_flow_dissect,
790 .needed_headroom = SJA1110_HEADER_LEN + VLAN_HLEN,
791 .needed_tailroom = SJA1110_RX_TRAILER_LEN + SJA1110_MAX_PADDING_LEN,
794 DSA_TAG_DRIVER(sja1110_netdev_ops);
795 MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_SJA1110);
797 static struct dsa_tag_driver *sja1105_tag_driver_array[] = {
798 &DSA_TAG_DRIVER_NAME(sja1105_netdev_ops),
799 &DSA_TAG_DRIVER_NAME(sja1110_netdev_ops),
802 module_dsa_tag_drivers(sja1105_tag_driver_array);
804 MODULE_LICENSE("GPL v2");