1
2
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
11static inline bool sja1105_is_link_local(const struct sk_buff *skb)
12{
13 const struct ethhdr *hdr = eth_hdr(skb);
14 u64 dmac = ether_addr_to_u64(hdr->h_dest);
15
16 if (ntohs(hdr->h_proto) == ETH_P_SJA1105_META)
17 return false;
18 if ((dmac & SJA1105_LINKLOCAL_FILTER_A_MASK) ==
19 SJA1105_LINKLOCAL_FILTER_A)
20 return true;
21 if ((dmac & SJA1105_LINKLOCAL_FILTER_B_MASK) ==
22 SJA1105_LINKLOCAL_FILTER_B)
23 return true;
24 return false;
25}
26
27struct sja1105_meta {
28 u64 tstamp;
29 u64 dmac_byte_4;
30 u64 dmac_byte_3;
31 u64 source_port;
32 u64 switch_id;
33};
34
35static void sja1105_meta_unpack(const struct sk_buff *skb,
36 struct sja1105_meta *meta)
37{
38 u8 *buf = skb_mac_header(skb) + ETH_HLEN;
39
40
41
42
43
44
45
46
47
48
49
50 packing(buf, &meta->tstamp, 31, 0, 4, UNPACK, 0);
51 packing(buf + 4, &meta->dmac_byte_4, 7, 0, 1, UNPACK, 0);
52 packing(buf + 5, &meta->dmac_byte_3, 7, 0, 1, UNPACK, 0);
53 packing(buf + 6, &meta->source_port, 7, 0, 1, UNPACK, 0);
54 packing(buf + 7, &meta->switch_id, 7, 0, 1, UNPACK, 0);
55}
56
57static inline bool sja1105_is_meta_frame(const struct sk_buff *skb)
58{
59 const struct ethhdr *hdr = eth_hdr(skb);
60 u64 smac = ether_addr_to_u64(hdr->h_source);
61 u64 dmac = ether_addr_to_u64(hdr->h_dest);
62
63 if (smac != SJA1105_META_SMAC)
64 return false;
65 if (dmac != SJA1105_META_DMAC)
66 return false;
67 if (ntohs(hdr->h_proto) != ETH_P_SJA1105_META)
68 return false;
69 return true;
70}
71
72
73
74
75static bool sja1105_filter(const struct sk_buff *skb, struct net_device *dev)
76{
77 if (!dsa_port_is_vlan_filtering(dev->dsa_ptr))
78 return true;
79 if (sja1105_is_link_local(skb))
80 return true;
81 if (sja1105_is_meta_frame(skb))
82 return true;
83 return false;
84}
85
86
87static struct sk_buff *sja1105_defer_xmit(struct sja1105_port *sp,
88 struct sk_buff *skb)
89{
90
91
92
93 skb_queue_tail(&sp->xmit_queue, skb_get(skb));
94 kthread_queue_work(sp->xmit_worker, &sp->xmit_work);
95
96 return NULL;
97}
98
99static struct sk_buff *sja1105_xmit(struct sk_buff *skb,
100 struct net_device *netdev)
101{
102 struct dsa_port *dp = dsa_slave_to_port(netdev);
103 u16 tx_vid = dsa_8021q_tx_vid(dp->ds, dp->index);
104 u16 queue_mapping = skb_get_queue_mapping(skb);
105 u8 pcp = netdev_txq_to_tc(netdev, queue_mapping);
106
107
108
109
110
111 if (unlikely(sja1105_is_link_local(skb)))
112 return sja1105_defer_xmit(dp->priv, skb);
113
114
115
116
117
118
119 if (dsa_port_is_vlan_filtering(dp))
120 return skb;
121
122 return dsa_8021q_xmit(skb, netdev, ETH_P_SJA1105,
123 ((pcp << VLAN_PRIO_SHIFT) | tx_vid));
124}
125
126static void sja1105_transfer_meta(struct sk_buff *skb,
127 const struct sja1105_meta *meta)
128{
129 struct ethhdr *hdr = eth_hdr(skb);
130
131 hdr->h_dest[3] = meta->dmac_byte_3;
132 hdr->h_dest[4] = meta->dmac_byte_4;
133 SJA1105_SKB_CB(skb)->meta_tstamp = meta->tstamp;
134}
135
136
137
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154
155
156static struct sk_buff
157*sja1105_rcv_meta_state_machine(struct sk_buff *skb,
158 struct sja1105_meta *meta,
159 bool is_link_local,
160 bool is_meta)
161{
162 struct sja1105_port *sp;
163 struct dsa_port *dp;
164
165 dp = dsa_slave_to_port(skb->dev);
166 sp = dp->priv;
167
168
169
170
171 if (is_link_local) {
172 if (!test_bit(SJA1105_HWTS_RX_EN, &sp->data->state))
173
174 return skb;
175
176 spin_lock(&sp->data->meta_lock);
177
178
179
180 if (sp->data->stampable_skb) {
181 dev_err_ratelimited(dp->ds->dev,
182 "Expected meta frame, is %12llx "
183 "in the DSA master multicast filter?\n",
184 SJA1105_META_DMAC);
185 kfree_skb(sp->data->stampable_skb);
186 }
187
188
189
190
191 sp->data->stampable_skb = skb_get(skb);
192 spin_unlock(&sp->data->meta_lock);
193
194
195 return NULL;
196
197
198
199
200
201
202
203 } else if (is_meta) {
204 struct sk_buff *stampable_skb;
205
206
207
208
209 if (!test_bit(SJA1105_HWTS_RX_EN, &sp->data->state))
210 return NULL;
211
212 spin_lock(&sp->data->meta_lock);
213
214 stampable_skb = sp->data->stampable_skb;
215 sp->data->stampable_skb = NULL;
216
217
218
219
220 if (!stampable_skb) {
221 dev_err_ratelimited(dp->ds->dev,
222 "Unexpected meta frame\n");
223 spin_unlock(&sp->data->meta_lock);
224 return NULL;
225 }
226
227 if (stampable_skb->dev != skb->dev) {
228 dev_err_ratelimited(dp->ds->dev,
229 "Meta frame on wrong port\n");
230 spin_unlock(&sp->data->meta_lock);
231 return NULL;
232 }
233
234
235
236
237 kfree_skb(skb);
238 skb = stampable_skb;
239 sja1105_transfer_meta(skb, meta);
240
241 spin_unlock(&sp->data->meta_lock);
242 }
243
244 return skb;
245}
246
247static struct sk_buff *sja1105_rcv(struct sk_buff *skb,
248 struct net_device *netdev,
249 struct packet_type *pt)
250{
251 struct sja1105_meta meta = {0};
252 int source_port, switch_id;
253 struct ethhdr *hdr;
254 u16 tpid, vid, tci;
255 bool is_link_local;
256 bool is_tagged;
257 bool is_meta;
258
259 hdr = eth_hdr(skb);
260 tpid = ntohs(hdr->h_proto);
261 is_tagged = (tpid == ETH_P_SJA1105);
262 is_link_local = sja1105_is_link_local(skb);
263 is_meta = sja1105_is_meta_frame(skb);
264
265 skb->offload_fwd_mark = 1;
266
267 if (is_tagged) {
268
269 skb_push_rcsum(skb, ETH_HLEN);
270 __skb_vlan_pop(skb, &tci);
271 skb_pull_rcsum(skb, ETH_HLEN);
272 skb_reset_network_header(skb);
273 skb_reset_transport_header(skb);
274
275 vid = tci & VLAN_VID_MASK;
276 source_port = dsa_8021q_rx_source_port(vid);
277 switch_id = dsa_8021q_rx_switch_id(vid);
278 skb->priority = (tci & VLAN_PRIO_MASK) >> VLAN_PRIO_SHIFT;
279 } else if (is_link_local) {
280
281
282
283
284 source_port = hdr->h_dest[3];
285 switch_id = hdr->h_dest[4];
286
287 hdr->h_dest[3] = 0;
288 hdr->h_dest[4] = 0;
289 } else if (is_meta) {
290 sja1105_meta_unpack(skb, &meta);
291 source_port = meta.source_port;
292 switch_id = meta.switch_id;
293 } else {
294 return NULL;
295 }
296
297 skb->dev = dsa_master_find_slave(netdev, switch_id, source_port);
298 if (!skb->dev) {
299 netdev_warn(netdev, "Couldn't decode source port\n");
300 return NULL;
301 }
302
303 return sja1105_rcv_meta_state_machine(skb, &meta, is_link_local,
304 is_meta);
305}
306
307static struct dsa_device_ops sja1105_netdev_ops = {
308 .name = "sja1105",
309 .proto = DSA_TAG_PROTO_SJA1105,
310 .xmit = sja1105_xmit,
311 .rcv = sja1105_rcv,
312 .filter = sja1105_filter,
313 .overhead = VLAN_HLEN,
314};
315
316MODULE_LICENSE("GPL v2");
317MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_SJA1105);
318
319module_dsa_tag_driver(sja1105_netdev_ops);
320