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2024-05-10 9999e48639b3cecb08ffb37358bcba3b48161b29 
 kernel/net/hsr/hsr_forward.c
....@@ -1,12 +1,10 @@
1
+// SPDX-License-Identifier: GPL-2.0
12 /* Copyright 2011-2014 Autronica Fire and Security AS
2
- *
3
- * This program is free software; you can redistribute it and/or modify it
4
- * under the terms of the GNU General Public License as published by the Free
5
- * Software Foundation; either version 2 of the License, or (at your option)
6
- * any later version.
73  *
84  * Author(s):
95  *	2011-2014 Arvid Brodin, arvid.brodin@alten.se
6
+ *
7
+ * Frame router for HSR and PRP.
108  */
119 
1210 #include "hsr_forward.h"
....@@ -17,21 +15,7 @@
1715 #include "hsr_main.h"
1816 #include "hsr_framereg.h"
1917 
20
-
2118 struct hsr_node;
22
-
23
-struct hsr_frame_info {
24
-	struct sk_buff *skb_std;
25
-	struct sk_buff *skb_hsr;
26
-	struct hsr_port *port_rcv;
27
-	struct hsr_node *node_src;
28
-	u16 sequence_nr;
29
-	bool is_supervision;
30
-	bool is_vlan;
31
-	bool is_local_dest;
32
-	bool is_local_exclusive;
33
-};
34
-
3519 
3620 /* The uses I can see for these HSR supervision frames are:
3721  * 1) Use the frames that are sent after node initialization ("HSR_TLV.Type =
....@@ -50,48 +34,49 @@
5034  */
5135 static bool is_supervision_frame(struct hsr_priv *hsr, struct sk_buff *skb)
5236 {
53
-	struct ethhdr *ethHdr;
54
-	struct hsr_sup_tag *hsrSupTag;
55
-	struct hsrv1_ethhdr_sp *hsrV1Hdr;
37
+	struct ethhdr *eth_hdr;
38
+	struct hsr_sup_tag *hsr_sup_tag;
39
+	struct hsrv1_ethhdr_sp *hsr_V1_hdr;
5640 
5741 	WARN_ON_ONCE(!skb_mac_header_was_set(skb));
58
-	ethHdr = (struct ethhdr *) skb_mac_header(skb);
42
+	eth_hdr = (struct ethhdr *)skb_mac_header(skb);
5943 
6044 	/* Correct addr? */
61
-	if (!ether_addr_equal(ethHdr->h_dest,
45
+	if (!ether_addr_equal(eth_hdr->h_dest,
6246 			      hsr->sup_multicast_addr))
6347 		return false;
6448 
6549 	/* Correct ether type?. */
66
-	if (!(ethHdr->h_proto == htons(ETH_P_PRP)
67
-			|| ethHdr->h_proto == htons(ETH_P_HSR)))
50
+	if (!(eth_hdr->h_proto == htons(ETH_P_PRP) ||
51
+	      eth_hdr->h_proto == htons(ETH_P_HSR)))
6852 		return false;
6953 
7054 	/* Get the supervision header from correct location. */
71
-	if (ethHdr->h_proto == htons(ETH_P_HSR)) { /* Okay HSRv1. */
72
-		hsrV1Hdr = (struct hsrv1_ethhdr_sp *) skb_mac_header(skb);
73
-		if (hsrV1Hdr->hsr.encap_proto != htons(ETH_P_PRP))
55
+	if (eth_hdr->h_proto == htons(ETH_P_HSR)) { /* Okay HSRv1. */
56
+		hsr_V1_hdr = (struct hsrv1_ethhdr_sp *)skb_mac_header(skb);
57
+		if (hsr_V1_hdr->hsr.encap_proto != htons(ETH_P_PRP))
7458 			return false;
7559 
76
-		hsrSupTag = &hsrV1Hdr->hsr_sup;
60
+		hsr_sup_tag = &hsr_V1_hdr->hsr_sup;
7761 	} else {
78
-		hsrSupTag = &((struct hsrv0_ethhdr_sp *) skb_mac_header(skb))->hsr_sup;
62
+		hsr_sup_tag =
63
+		     &((struct hsrv0_ethhdr_sp *)skb_mac_header(skb))->hsr_sup;
7964 	}
8065 
81
-	if ((hsrSupTag->HSR_TLV_Type != HSR_TLV_ANNOUNCE) &&
82
-	    (hsrSupTag->HSR_TLV_Type != HSR_TLV_LIFE_CHECK))
66
+	if (hsr_sup_tag->HSR_TLV_type != HSR_TLV_ANNOUNCE &&
67
+	    hsr_sup_tag->HSR_TLV_type != HSR_TLV_LIFE_CHECK &&
68
+	    hsr_sup_tag->HSR_TLV_type != PRP_TLV_LIFE_CHECK_DD &&
69
+	    hsr_sup_tag->HSR_TLV_type != PRP_TLV_LIFE_CHECK_DA)
8370 		return false;
84
-	if ((hsrSupTag->HSR_TLV_Length != 12) &&
85
-			(hsrSupTag->HSR_TLV_Length !=
86
-					sizeof(struct hsr_sup_payload)))
71
+	if (hsr_sup_tag->HSR_TLV_length != 12 &&
72
+	    hsr_sup_tag->HSR_TLV_length != sizeof(struct hsr_sup_payload))
8773 		return false;
8874 
8975 	return true;
9076 }
9177 
92
-
93
-static struct sk_buff *create_stripped_skb(struct sk_buff *skb_in,
94
-					   struct hsr_frame_info *frame)
78
+static struct sk_buff *create_stripped_skb_hsr(struct sk_buff *skb_in,
79
+					       struct hsr_frame_info *frame)
9580 {
9681 	struct sk_buff *skb;
9782 	int copylen;
....@@ -100,7 +85,7 @@
10085 	skb_pull(skb_in, HSR_HLEN);
10186 	skb = __pskb_copy(skb_in, skb_headroom(skb_in) - HSR_HLEN, GFP_ATOMIC);
10287 	skb_push(skb_in, HSR_HLEN);
103
-	if (skb == NULL)
88
+	if (!skb)
10489 		return NULL;
10590 
10691 	skb_reset_mac_header(skb);
....@@ -108,7 +93,7 @@
10893 	if (skb->ip_summed == CHECKSUM_PARTIAL)
10994 		skb->csum_start -= HSR_HLEN;
11095 
111
-	copylen = 2*ETH_ALEN;
96
+	copylen = 2 * ETH_ALEN;
11297 	if (frame->is_vlan)
11398 		copylen += VLAN_HLEN;
11499 	src = skb_mac_header(skb_in);
....@@ -119,52 +104,157 @@
119104 	return skb;
120105 }
121106 
122
-static struct sk_buff *frame_get_stripped_skb(struct hsr_frame_info *frame,
123
-					      struct hsr_port *port)
107
+struct sk_buff *hsr_get_untagged_frame(struct hsr_frame_info *frame,
108
+				       struct hsr_port *port)
124109 {
125
-	if (!frame->skb_std)
126
-		frame->skb_std = create_stripped_skb(frame->skb_hsr, frame);
110
+	if (!frame->skb_std) {
111
+		if (frame->skb_hsr)
112
+			frame->skb_std =
113
+				create_stripped_skb_hsr(frame->skb_hsr, frame);
114
+		else
115
+			netdev_warn_once(port->dev,
116
+					 "Unexpected frame received in hsr_get_untagged_frame()\n");
117
+
118
+		if (!frame->skb_std)
119
+			return NULL;
120
+	}
121
+
127122 	return skb_clone(frame->skb_std, GFP_ATOMIC);
128123 }
129124 
130
-
131
-static void hsr_fill_tag(struct sk_buff *skb, struct hsr_frame_info *frame,
132
-			 struct hsr_port *port, u8 protoVersion)
125
+struct sk_buff *prp_get_untagged_frame(struct hsr_frame_info *frame,
126
+				       struct hsr_port *port)
133127 {
134
-	struct hsr_ethhdr *hsr_ethhdr;
128
+	if (!frame->skb_std) {
129
+		if (frame->skb_prp) {
130
+			/* trim the skb by len - HSR_HLEN to exclude RCT */
131
+			skb_trim(frame->skb_prp,
132
+				 frame->skb_prp->len - HSR_HLEN);
133
+			frame->skb_std =
134
+				__pskb_copy(frame->skb_prp,
135
+					    skb_headroom(frame->skb_prp),
136
+					    GFP_ATOMIC);
137
+		} else {
138
+			/* Unexpected */
139
+			WARN_ONCE(1, "%s:%d: Unexpected frame received (port_src %s)\n",
140
+				  __FILE__, __LINE__, port->dev->name);
141
+			return NULL;
142
+		}
143
+	}
144
+
145
+	return skb_clone(frame->skb_std, GFP_ATOMIC);
146
+}
147
+
148
+static void prp_set_lan_id(struct prp_rct *trailer,
149
+			   struct hsr_port *port)
150
+{
135151 	int lane_id;
136
-	int lsdu_size;
137152 
138153 	if (port->type == HSR_PT_SLAVE_A)
139154 		lane_id = 0;
140155 	else
141156 		lane_id = 1;
142157 
158
+	/* Add net_id in the upper 3 bits of lane_id */
159
+	lane_id |= port->hsr->net_id;
160
+	set_prp_lan_id(trailer, lane_id);
161
+}
162
+
163
+/* Tailroom for PRP rct should have been created before calling this */
164
+static struct sk_buff *prp_fill_rct(struct sk_buff *skb,
165
+				    struct hsr_frame_info *frame,
166
+				    struct hsr_port *port)
167
+{
168
+	struct prp_rct *trailer;
169
+	int min_size = ETH_ZLEN;
170
+	int lsdu_size;
171
+
172
+	if (!skb)
173
+		return skb;
174
+
175
+	if (frame->is_vlan)
176
+		min_size = VLAN_ETH_ZLEN;
177
+
178
+	if (skb_put_padto(skb, min_size))
179
+		return NULL;
180
+
181
+	trailer = (struct prp_rct *)skb_put(skb, HSR_HLEN);
182
+	lsdu_size = skb->len - 14;
183
+	if (frame->is_vlan)
184
+		lsdu_size -= 4;
185
+	prp_set_lan_id(trailer, port);
186
+	set_prp_LSDU_size(trailer, lsdu_size);
187
+	trailer->sequence_nr = htons(frame->sequence_nr);
188
+	trailer->PRP_suffix = htons(ETH_P_PRP);
189
+	skb->protocol = eth_hdr(skb)->h_proto;
190
+
191
+	return skb;
192
+}
193
+
194
+static void hsr_set_path_id(struct hsr_ethhdr *hsr_ethhdr,
195
+			    struct hsr_port *port)
196
+{
197
+	int path_id;
198
+
199
+	if (port->type == HSR_PT_SLAVE_A)
200
+		path_id = 0;
201
+	else
202
+		path_id = 1;
203
+
204
+	set_hsr_tag_path(&hsr_ethhdr->hsr_tag, path_id);
205
+}
206
+
207
+static struct sk_buff *hsr_fill_tag(struct sk_buff *skb,
208
+				    struct hsr_frame_info *frame,
209
+				    struct hsr_port *port, u8 proto_version)
210
+{
211
+	struct hsr_ethhdr *hsr_ethhdr;
212
+	int lsdu_size;
213
+
214
+	/* pad to minimum packet size which is 60 + 6 (HSR tag) */
215
+	if (skb_put_padto(skb, ETH_ZLEN + HSR_HLEN))
216
+		return NULL;
217
+
143218 	lsdu_size = skb->len - 14;
144219 	if (frame->is_vlan)
145220 		lsdu_size -= 4;
146221 
147
-	hsr_ethhdr = (struct hsr_ethhdr *) skb_mac_header(skb);
222
+	hsr_ethhdr = (struct hsr_ethhdr *)skb_mac_header(skb);
148223 
149
-	set_hsr_tag_path(&hsr_ethhdr->hsr_tag, lane_id);
224
+	hsr_set_path_id(hsr_ethhdr, port);
150225 	set_hsr_tag_LSDU_size(&hsr_ethhdr->hsr_tag, lsdu_size);
151226 	hsr_ethhdr->hsr_tag.sequence_nr = htons(frame->sequence_nr);
152227 	hsr_ethhdr->hsr_tag.encap_proto = hsr_ethhdr->ethhdr.h_proto;
153
-	hsr_ethhdr->ethhdr.h_proto = htons(protoVersion ?
228
+	hsr_ethhdr->ethhdr.h_proto = htons(proto_version ?
154229 			ETH_P_HSR : ETH_P_PRP);
230
+	skb->protocol = hsr_ethhdr->ethhdr.h_proto;
231
+
232
+	return skb;
155233 }
156234 
157
-static struct sk_buff *create_tagged_skb(struct sk_buff *skb_o,
158
-					 struct hsr_frame_info *frame,
159
-					 struct hsr_port *port)
235
+/* If the original frame was an HSR tagged frame, just clone it to be sent
236
+ * unchanged. Otherwise, create a private frame especially tagged for 'port'.
237
+ */
238
+struct sk_buff *hsr_create_tagged_frame(struct hsr_frame_info *frame,
239
+					struct hsr_port *port)
160240 {
161
-	int movelen;
162241 	unsigned char *dst, *src;
163242 	struct sk_buff *skb;
243
+	int movelen;
244
+
245
+	if (frame->skb_hsr) {
246
+		struct hsr_ethhdr *hsr_ethhdr =
247
+			(struct hsr_ethhdr *)skb_mac_header(frame->skb_hsr);
248
+
249
+		/* set the lane id properly */
250
+		hsr_set_path_id(hsr_ethhdr, port);
251
+		return skb_clone(frame->skb_hsr, GFP_ATOMIC);
252
+	}
164253 
165254 	/* Create the new skb with enough headroom to fit the HSR tag */
166
-	skb = __pskb_copy(skb_o, skb_headroom(skb_o) + HSR_HLEN, GFP_ATOMIC);
167
-	if (skb == NULL)
255
+	skb = __pskb_copy(frame->skb_std,
256
+			  skb_headroom(frame->skb_std) + HSR_HLEN, GFP_ATOMIC);
257
+	if (!skb)
168258 		return NULL;
169259 	skb_reset_mac_header(skb);
170260 
....@@ -180,44 +270,53 @@
180270 	memmove(dst, src, movelen);
181271 	skb_reset_mac_header(skb);
182272 
183
-	hsr_fill_tag(skb, frame, port, port->hsr->protVersion);
273
+	/* skb_put_padto free skb on error and hsr_fill_tag returns NULL in
274
+	 * that case
275
+	 */
276
+	return hsr_fill_tag(skb, frame, port, port->hsr->prot_version);
277
+}
278
+
279
+struct sk_buff *prp_create_tagged_frame(struct hsr_frame_info *frame,
280
+					struct hsr_port *port)
281
+{
282
+	struct sk_buff *skb;
283
+
284
+	if (frame->skb_prp) {
285
+		struct prp_rct *trailer = skb_get_PRP_rct(frame->skb_prp);
286
+
287
+		if (trailer) {
288
+			prp_set_lan_id(trailer, port);
289
+		} else {
290
+			WARN_ONCE(!trailer, "errored PRP skb");
291
+			return NULL;
292
+		}
293
+		return skb_clone(frame->skb_prp, GFP_ATOMIC);
294
+	}
295
+
296
+	skb = skb_copy_expand(frame->skb_std, 0,
297
+			      skb_tailroom(frame->skb_std) + HSR_HLEN,
298
+			      GFP_ATOMIC);
299
+	prp_fill_rct(skb, frame, port);
184300 
185301 	return skb;
186302 }
187
-
188
-/* If the original frame was an HSR tagged frame, just clone it to be sent
189
- * unchanged. Otherwise, create a private frame especially tagged for 'port'.
190
- */
191
-static struct sk_buff *frame_get_tagged_skb(struct hsr_frame_info *frame,
192
-					    struct hsr_port *port)
193
-{
194
-	if (frame->skb_hsr)
195
-		return skb_clone(frame->skb_hsr, GFP_ATOMIC);
196
-
197
-	if ((port->type != HSR_PT_SLAVE_A) && (port->type != HSR_PT_SLAVE_B)) {
198
-		WARN_ONCE(1, "HSR: Bug: trying to create a tagged frame for a non-ring port");
199
-		return NULL;
200
-	}
201
-
202
-	return create_tagged_skb(frame->skb_std, frame, port);
203
-}
204
-
205303 
206304 static void hsr_deliver_master(struct sk_buff *skb, struct net_device *dev,
207305 			       struct hsr_node *node_src)
208306 {
209307 	bool was_multicast_frame;
210
-	int res;
308
+	int res, recv_len;
211309 
212310 	was_multicast_frame = (skb->pkt_type == PACKET_MULTICAST);
213311 	hsr_addr_subst_source(node_src, skb);
214312 	skb_pull(skb, ETH_HLEN);
313
+	recv_len = skb->len;
215314 	res = netif_rx(skb);
216315 	if (res == NET_RX_DROP) {
217316 		dev->stats.rx_dropped++;
218317 	} else {
219318 		dev->stats.rx_packets++;
220
-		dev->stats.rx_bytes += skb->len;
319
+		dev->stats.rx_bytes += recv_len;
221320 		if (was_multicast_frame)
222321 			dev->stats.multicast++;
223322 	}
....@@ -237,10 +336,18 @@
237336 	return dev_queue_xmit(skb);
238337 }
239338 
339
+bool prp_drop_frame(struct hsr_frame_info *frame, struct hsr_port *port)
340
+{
341
+	return ((frame->port_rcv->type == HSR_PT_SLAVE_A &&
342
+		 port->type ==  HSR_PT_SLAVE_B) ||
343
+		(frame->port_rcv->type == HSR_PT_SLAVE_B &&
344
+		 port->type ==  HSR_PT_SLAVE_A));
345
+}
240346 
241347 /* Forward the frame through all devices except:
242348  * - Back through the receiving device
243349  * - If it's a HSR frame: through a device where it has passed before
350
+ * - if it's a PRP frame: through another PRP slave device (no bridge)
244351  * - To the local HSR master only if the frame is directly addressed to it, or
245352  *   a non-supervision multicast or broadcast frame.
246353  *
....@@ -255,36 +362,46 @@
255362 	struct sk_buff *skb;
256363 
257364 	hsr_for_each_port(frame->port_rcv->hsr, port) {
365
+		struct hsr_priv *hsr = port->hsr;
258366 		/* Don't send frame back the way it came */
259367 		if (port == frame->port_rcv)
260368 			continue;
261369 
262370 		/* Don't deliver locally unless we should */
263
-		if ((port->type == HSR_PT_MASTER) && !frame->is_local_dest)
371
+		if (port->type == HSR_PT_MASTER && !frame->is_local_dest)
264372 			continue;
265373 
266374 		/* Deliver frames directly addressed to us to master only */
267
-		if ((port->type != HSR_PT_MASTER) && frame->is_local_exclusive)
375
+		if (port->type != HSR_PT_MASTER && frame->is_local_exclusive)
268376 			continue;
269377 
270
-		/* Don't send frame over port where it has been sent before */
271
-		if (hsr_register_frame_out(port, frame->node_src,
378
+		/* Don't send frame over port where it has been sent before.
379
+		 * Also fro SAN, this shouldn't be done.
380
+		 */
381
+		if (!frame->is_from_san &&
382
+		    hsr_register_frame_out(port, frame->node_src,
272383 					   frame->sequence_nr))
273384 			continue;
274385 
275
-		if (frame->is_supervision && (port->type == HSR_PT_MASTER)) {
276
-			hsr_handle_sup_frame(frame->skb_hsr,
277
-					     frame->node_src,
278
-					     frame->port_rcv);
386
+		if (frame->is_supervision && port->type == HSR_PT_MASTER) {
387
+			hsr_handle_sup_frame(frame);
279388 			continue;
280389 		}
281390 
391
+		/* Check if frame is to be dropped. Eg. for PRP no forward
392
+		 * between ports.
393
+		 */
394
+		if (hsr->proto_ops->drop_frame &&
395
+		    hsr->proto_ops->drop_frame(frame, port))
396
+			continue;
397
+
282398 		if (port->type != HSR_PT_MASTER)
283
-			skb = frame_get_tagged_skb(frame, port);
399
+			skb = hsr->proto_ops->create_tagged_frame(frame, port);
284400 		else
285
-			skb = frame_get_stripped_skb(frame, port);
286
-		if (skb == NULL) {
287
-			/* FIXME: Record the dropped frame? */
401
+			skb = hsr->proto_ops->get_untagged_frame(frame, port);
402
+
403
+		if (!skb) {
404
+			frame->port_rcv->dev->stats.rx_dropped++;
288405 			continue;
289406 		}
290407 
....@@ -296,7 +413,6 @@
296413 	}
297414 }
298415 
299
-
300416 static void check_local_dest(struct hsr_priv *hsr, struct sk_buff *skb,
301417 			     struct hsr_frame_info *frame)
302418 {
....@@ -307,50 +423,123 @@
307423 		frame->is_local_exclusive = false;
308424 	}
309425 
310
-	if ((skb->pkt_type == PACKET_HOST) ||
311
-	    (skb->pkt_type == PACKET_MULTICAST) ||
312
-	    (skb->pkt_type == PACKET_BROADCAST)) {
426
+	if (skb->pkt_type == PACKET_HOST ||
427
+	    skb->pkt_type == PACKET_MULTICAST ||
428
+	    skb->pkt_type == PACKET_BROADCAST) {
313429 		frame->is_local_dest = true;
314430 	} else {
315431 		frame->is_local_dest = false;
316432 	}
317433 }
318434 
319
-
320
-static int hsr_fill_frame_info(struct hsr_frame_info *frame,
321
-			       struct sk_buff *skb, struct hsr_port *port)
435
+static void handle_std_frame(struct sk_buff *skb,
436
+			     struct hsr_frame_info *frame)
322437 {
323
-	struct ethhdr *ethhdr;
324
-	unsigned long irqflags;
438
+	struct hsr_port *port = frame->port_rcv;
439
+	struct hsr_priv *hsr = port->hsr;
325440 
326
-	frame->is_supervision = is_supervision_frame(port->hsr, skb);
327
-	frame->node_src = hsr_get_node(port, skb, frame->is_supervision);
328
-	if (frame->node_src == NULL)
329
-		return -1; /* Unknown node and !is_supervision, or no mem */
441
+	frame->skb_hsr = NULL;
442
+	frame->skb_prp = NULL;
443
+	frame->skb_std = skb;
330444 
331
-	ethhdr = (struct ethhdr *) skb_mac_header(skb);
332
-	frame->is_vlan = false;
333
-	if (ethhdr->h_proto == htons(ETH_P_8021Q)) {
334
-		frame->is_vlan = true;
335
-		/* FIXME: */
336
-		WARN_ONCE(1, "HSR: VLAN not yet supported");
445
+	if (port->type != HSR_PT_MASTER) {
446
+		frame->is_from_san = true;
447
+	} else {
448
+		/* Sequence nr for the master node */
449
+		lockdep_assert_held(&hsr->seqnr_lock);
450
+		frame->sequence_nr = hsr->sequence_nr;
451
+		hsr->sequence_nr++;
337452 	}
338
-	if (ethhdr->h_proto == htons(ETH_P_PRP)
339
-			|| ethhdr->h_proto == htons(ETH_P_HSR)) {
453
+}
454
+
455
+int hsr_fill_frame_info(__be16 proto, struct sk_buff *skb,
456
+			struct hsr_frame_info *frame)
457
+{
458
+	struct hsr_port *port = frame->port_rcv;
459
+	struct hsr_priv *hsr = port->hsr;
460
+
461
+	/* HSRv0 supervisory frames double as a tag so treat them as tagged. */
462
+	if ((!hsr->prot_version && proto == htons(ETH_P_PRP)) ||
463
+	    proto == htons(ETH_P_HSR)) {
464
+		/* Check if skb contains hsr_ethhdr */
465
+		if (skb->mac_len < sizeof(struct hsr_ethhdr))
466
+			return -EINVAL;
467
+
468
+		/* HSR tagged frame :- Data or Supervision */
340469 		frame->skb_std = NULL;
470
+		frame->skb_prp = NULL;
341471 		frame->skb_hsr = skb;
342472 		frame->sequence_nr = hsr_get_skb_sequence_nr(skb);
343
-	} else {
344
-		frame->skb_std = skb;
345
-		frame->skb_hsr = NULL;
346
-		/* Sequence nr for the master node */
347
-		spin_lock_irqsave(&port->hsr->seqnr_lock, irqflags);
348
-		frame->sequence_nr = port->hsr->sequence_nr;
349
-		port->hsr->sequence_nr++;
350
-		spin_unlock_irqrestore(&port->hsr->seqnr_lock, irqflags);
473
+		return 0;
351474 	}
352475 
476
+	/* Standard frame or PRP from master port */
477
+	handle_std_frame(skb, frame);
478
+
479
+	return 0;
480
+}
481
+
482
+int prp_fill_frame_info(__be16 proto, struct sk_buff *skb,
483
+			struct hsr_frame_info *frame)
484
+{
485
+	/* Supervision frame */
486
+	struct prp_rct *rct = skb_get_PRP_rct(skb);
487
+
488
+	if (rct &&
489
+	    prp_check_lsdu_size(skb, rct, frame->is_supervision)) {
490
+		frame->skb_hsr = NULL;
491
+		frame->skb_std = NULL;
492
+		frame->skb_prp = skb;
493
+		frame->sequence_nr = prp_get_skb_sequence_nr(rct);
494
+		return 0;
495
+	}
496
+	handle_std_frame(skb, frame);
497
+
498
+	return 0;
499
+}
500
+
501
+static int fill_frame_info(struct hsr_frame_info *frame,
502
+			   struct sk_buff *skb, struct hsr_port *port)
503
+{
504
+	struct hsr_priv *hsr = port->hsr;
505
+	struct hsr_vlan_ethhdr *vlan_hdr;
506
+	struct ethhdr *ethhdr;
507
+	__be16 proto;
508
+	int ret;
509
+
510
+	/* Check if skb contains ethhdr */
511
+	if (skb->mac_len < sizeof(struct ethhdr))
512
+		return -EINVAL;
513
+
514
+	memset(frame, 0, sizeof(*frame));
515
+	frame->is_supervision = is_supervision_frame(port->hsr, skb);
516
+	frame->node_src = hsr_get_node(port, &hsr->node_db, skb,
517
+				       frame->is_supervision,
518
+				       port->type);
519
+	if (!frame->node_src)
520
+		return -1; /* Unknown node and !is_supervision, or no mem */
521
+
522
+	ethhdr = (struct ethhdr *)skb_mac_header(skb);
523
+	frame->is_vlan = false;
524
+	proto = ethhdr->h_proto;
525
+
526
+	if (proto == htons(ETH_P_8021Q))
527
+		frame->is_vlan = true;
528
+
529
+	if (frame->is_vlan) {
530
+		vlan_hdr = (struct hsr_vlan_ethhdr *)ethhdr;
531
+		proto = vlan_hdr->vlanhdr.h_vlan_encapsulated_proto;
532
+		/* FIXME: */
533
+		netdev_warn_once(skb->dev, "VLAN not yet supported");
534
+		return -EINVAL;
535
+	}
536
+
537
+	frame->is_from_san = false;
353538 	frame->port_rcv = port;
539
+	ret = hsr->proto_ops->fill_frame_info(proto, skb, frame);
540
+	if (ret)
541
+		return ret;
542
+
354543 	check_local_dest(port->hsr, skb, frame);
355544 
356545 	return 0;
....@@ -361,24 +550,28 @@
361550 {
362551 	struct hsr_frame_info frame;
363552 
364
-	if (skb_mac_header(skb) != skb->data) {
365
-		WARN_ONCE(1, "%s:%d: Malformed frame (port_src %s)\n",
366
-			  __FILE__, __LINE__, port->dev->name);
553
+	rcu_read_lock();
554
+	if (fill_frame_info(&frame, skb, port) < 0)
367555 		goto out_drop;
368
-	}
369556 
370
-	if (hsr_fill_frame_info(&frame, skb, port) < 0)
371
-		goto out_drop;
372557 	hsr_register_frame_in(frame.node_src, port, frame.sequence_nr);
373558 	hsr_forward_do(&frame);
559
+	rcu_read_unlock();
560
+	/* Gets called for ingress frames as well as egress from master port.
561
+	 * So check and increment stats for master port only here.
562
+	 */
563
+	if (port->type == HSR_PT_MASTER) {
564
+		port->dev->stats.tx_packets++;
565
+		port->dev->stats.tx_bytes += skb->len;
566
+	}
374567 
375
-	if (frame.skb_hsr != NULL)
376
-		kfree_skb(frame.skb_hsr);
377
-	if (frame.skb_std != NULL)
378
-		kfree_skb(frame.skb_std);
568
+	kfree_skb(frame.skb_hsr);
569
+	kfree_skb(frame.skb_prp);
570
+	kfree_skb(frame.skb_std);
379571 	return;
380572 
381573 out_drop:
574
+	rcu_read_unlock();
382575 	port->dev->stats.tx_dropped++;
383576 	kfree_skb(skb);
384577 }