Merge branch 'net-hsr-improvements-and-bug-fixes'

Murali Karicheri says:

====================
net: hsr: improvements and bug fixes

This series has some coding style fixes and other bug fixes.
Patch 12/14, I have also done SPDX conversion. Not sure if
that is the only thing needed and is correct. So please pay
close attention to this patch before merge as I would like to
avoid any issue related to licensing applicable for this code.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

net/hsr/Makefile

@@ -6,3 +6,4 @@ obj-$(CONFIG_HSR)	+= hsr.o
 
 hsr-y			:= hsr_main.o hsr_framereg.o hsr_device.o \
 			   hsr_netlink.o hsr_slave.o hsr_forward.o
+hsr-$(CONFIG_DEBUG_FS) += hsr_prp_debugfs.o

net/hsr/hsr_device.c

+// SPDX-License-Identifier: GPL-2.0
 /* Copyright 2011-2014 Autronica Fire and Security AS
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
  *
  * Author(s):
  *	2011-2014 Arvid Brodin, arvid.brodin@alten.se
@@ -23,7 +19,6 @@
 #include "hsr_main.h"
 #include "hsr_forward.h"
 
-
 static bool is_admin_up(struct net_device *dev)
 {
 	return dev && (dev->flags & IFF_UP);
@@ -68,7 +63,7 @@ static bool hsr_check_carrier(struct hsr_port *master)
 
 	rcu_read_lock();
 	hsr_for_each_port(master->hsr, port)
-		if ((port->type != HSR_PT_MASTER) && is_slave_up(port->dev)) {
+		if (port->type != HSR_PT_MASTER && is_slave_up(port->dev)) {
 			has_carrier = true;
 			break;
 		}
@@ -82,7 +77,6 @@ static bool hsr_check_carrier(struct hsr_port *master)
 	return has_carrier;
 }
 
-
 static void hsr_check_announce(struct net_device *hsr_dev,
 			       unsigned char old_operstate)
 {
@@ -90,15 +84,14 @@ static void hsr_check_announce(struct net_device *hsr_dev,
 
 	hsr = netdev_priv(hsr_dev);
 
-	if ((hsr_dev->operstate == IF_OPER_UP)
-			&& (old_operstate != IF_OPER_UP)) {
+	if (hsr_dev->operstate == IF_OPER_UP && old_operstate != IF_OPER_UP) {
 		/* Went up */
 		hsr->announce_count = 0;
 		mod_timer(&hsr->announce_timer,
 			  jiffies + msecs_to_jiffies(HSR_ANNOUNCE_INTERVAL));
 	}
 
-	if ((hsr_dev->operstate != IF_OPER_UP) && (old_operstate == IF_OPER_UP))
+	if (hsr_dev->operstate != IF_OPER_UP && old_operstate == IF_OPER_UP)
 		/* Went down */
 		del_timer(&hsr->announce_timer);
 }
@@ -136,7 +129,6 @@ int hsr_get_max_mtu(struct hsr_priv *hsr)
 	return mtu_max - HSR_HLEN;
 }
 
-
 static int hsr_dev_change_mtu(struct net_device *dev, int new_mtu)
 {
 	struct hsr_priv *hsr;
@@ -191,14 +183,12 @@ static int hsr_dev_open(struct net_device *dev)
 	return 0;
 }
 
-
 static int hsr_dev_close(struct net_device *dev)
 {
 	/* Nothing to do here. */
 	return 0;
 }
 
-
 static netdev_features_t hsr_features_recompute(struct hsr_priv *hsr,
 						netdev_features_t features)
 {
@@ -231,7 +221,6 @@ static netdev_features_t hsr_fix_features(struct net_device *dev,
 	return hsr_features_recompute(hsr, features);
 }
 
-
 static int hsr_dev_xmit(struct sk_buff *skb, struct net_device *dev)
 {
 	struct hsr_priv *hsr = netdev_priv(dev);
@@ -244,14 +233,13 @@ static int hsr_dev_xmit(struct sk_buff *skb, struct net_device *dev)
 	return NETDEV_TX_OK;
 }
 
-
 static const struct header_ops hsr_header_ops = {
 	.create	 = eth_header,
 	.parse	 = eth_header_parse,
 };
 
 static void send_hsr_supervision_frame(struct hsr_port *master,
-		u8 type, u8 hsrVer)
+				       u8 type, u8 hsr_ver)
 {
 	struct sk_buff *skb;
 	int hlen, tlen;
@@ -262,39 +250,38 @@ static void send_hsr_supervision_frame(struct hsr_port *master,
 
 	hlen = LL_RESERVED_SPACE(master->dev);
 	tlen = master->dev->needed_tailroom;
-	skb = dev_alloc_skb(
-			sizeof(struct hsr_tag) +
-			sizeof(struct hsr_sup_tag) +
-			sizeof(struct hsr_sup_payload) + hlen + tlen);
+	skb = dev_alloc_skb(sizeof(struct hsr_tag) +
+			    sizeof(struct hsr_sup_tag) +
+			    sizeof(struct hsr_sup_payload) + hlen + tlen);
 
-	if (skb == NULL)
+	if (!skb)
 		return;
 
 	skb_reserve(skb, hlen);
 
 	skb->dev = master->dev;
-	skb->protocol = htons(hsrVer ? ETH_P_HSR : ETH_P_PRP);
+	skb->protocol = htons(hsr_ver ? ETH_P_HSR : ETH_P_PRP);
 	skb->priority = TC_PRIO_CONTROL;
 
-	if (dev_hard_header(skb, skb->dev, (hsrVer ? ETH_P_HSR : ETH_P_PRP),
+	if (dev_hard_header(skb, skb->dev, (hsr_ver ? ETH_P_HSR : ETH_P_PRP),
 			    master->hsr->sup_multicast_addr,
 			    skb->dev->dev_addr, skb->len) <= 0)
 		goto out;
 	skb_reset_mac_header(skb);
 
-	if (hsrVer > 0) {
+	if (hsr_ver > 0) {
 		hsr_tag = skb_put(skb, sizeof(struct hsr_tag));
 		hsr_tag->encap_proto = htons(ETH_P_PRP);
 		set_hsr_tag_LSDU_size(hsr_tag, HSR_V1_SUP_LSDUSIZE);
 	}
 
 	hsr_stag = skb_put(skb, sizeof(struct hsr_sup_tag));
-	set_hsr_stag_path(hsr_stag, (hsrVer ? 0x0 : 0xf));
-	set_hsr_stag_HSR_Ver(hsr_stag, hsrVer);
+	set_hsr_stag_path(hsr_stag, (hsr_ver ? 0x0 : 0xf));
+	set_hsr_stag_HSR_ver(hsr_stag, hsr_ver);
 
 	/* From HSRv1 on we have separate supervision sequence numbers. */
 	spin_lock_irqsave(&master->hsr->seqnr_lock, irqflags);
-	if (hsrVer > 0) {
+	if (hsr_ver > 0) {
 		hsr_stag->sequence_nr = htons(master->hsr->sup_sequence_nr);
 		hsr_tag->sequence_nr = htons(master->hsr->sequence_nr);
 		master->hsr->sup_sequence_nr++;
@@ -305,13 +292,14 @@ static void send_hsr_supervision_frame(struct hsr_port *master,
 	}
 	spin_unlock_irqrestore(&master->hsr->seqnr_lock, irqflags);
 
-	hsr_stag->HSR_TLV_Type = type;
+	hsr_stag->HSR_TLV_type = type;
 	/* TODO: Why 12 in HSRv0? */
-	hsr_stag->HSR_TLV_Length = hsrVer ? sizeof(struct hsr_sup_payload) : 12;
+	hsr_stag->HSR_TLV_length =
+				hsr_ver ? sizeof(struct hsr_sup_payload) : 12;
 
 	/* Payload: MacAddressA */
 	hsr_sp = skb_put(skb, sizeof(struct hsr_sup_payload));
-	ether_addr_copy(hsr_sp->MacAddressA, master->dev->dev_addr);
+	ether_addr_copy(hsr_sp->macaddress_A, master->dev->dev_addr);
 
 	if (skb_put_padto(skb, ETH_ZLEN + HSR_HLEN))
 		return;
@@ -324,7 +312,6 @@ static void send_hsr_supervision_frame(struct hsr_port *master,
 	kfree_skb(skb);
 }
 
-
 /* Announce (supervision frame) timer function
  */
 static void hsr_announce(struct timer_list *t)
@@ -338,15 +325,15 @@ static void hsr_announce(struct timer_list *t)
 	rcu_read_lock();
 	master = hsr_port_get_hsr(hsr, HSR_PT_MASTER);
 
-	if (hsr->announce_count < 3 && hsr->protVersion == 0) {
+	if (hsr->announce_count < 3 && hsr->prot_version == 0) {
 		send_hsr_supervision_frame(master, HSR_TLV_ANNOUNCE,
-				hsr->protVersion);
+					   hsr->prot_version);
 		hsr->announce_count++;
 
 		interval = msecs_to_jiffies(HSR_ANNOUNCE_INTERVAL);
 	} else {
 		send_hsr_supervision_frame(master, HSR_TLV_LIFE_CHECK,
-				hsr->protVersion);
+					   hsr->prot_version);
 
 		interval = msecs_to_jiffies(HSR_LIFE_CHECK_INTERVAL);
 	}
@@ -357,7 +344,6 @@ static void hsr_announce(struct timer_list *t)
 	rcu_read_unlock();
 }
 
-
 /* According to comments in the declaration of struct net_device, this function
  * is "Called from unregister, can be used to call free_netdev". Ok then...
  */
@@ -368,6 +354,8 @@ static void hsr_dev_destroy(struct net_device *hsr_dev)
 
 	hsr = netdev_priv(hsr_dev);
 
+	hsr_prp_debugfs_term(hsr);
+
 	rtnl_lock();
 	hsr_for_each_port(hsr, port)
 		hsr_del_port(port);
@@ -423,7 +411,6 @@ void hsr_dev_setup(struct net_device *dev)
 	dev->features |= NETIF_F_NETNS_LOCAL;
 }
 
-
 /* Return true if dev is a HSR master; return false otherwise.
  */
 inline bool is_hsr_master(struct net_device *dev)
@@ -467,7 +454,7 @@ int hsr_dev_finalize(struct net_device *hsr_dev, struct net_device *slave[2],
 	ether_addr_copy(hsr->sup_multicast_addr, def_multicast_addr);
 	hsr->sup_multicast_addr[ETH_ALEN - 1] = multicast_spec;
 
-	hsr->protVersion = protocol_version;
+	hsr->prot_version = protocol_version;
 
 	/* FIXME: should I modify the value of these?
 	 *
@@ -498,6 +485,9 @@ int hsr_dev_finalize(struct net_device *hsr_dev, struct net_device *slave[2],
 		goto fail;
 
 	mod_timer(&hsr->prune_timer, jiffies + msecs_to_jiffies(PRUNE_PERIOD));
+	res = hsr_prp_debugfs_init(hsr);
+	if (res)
+		goto fail;
 
 	return 0;
 

net/hsr/hsr_device.h

+/* SPDX-License-Identifier: GPL-2.0 */
 /* Copyright 2011-2014 Autronica Fire and Security AS
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
  *
  * Author(s):
  *	2011-2014 Arvid Brodin, arvid.brodin@alten.se

net/hsr/hsr_forward.c

+// SPDX-License-Identifier: GPL-2.0
 /* Copyright 2011-2014 Autronica Fire and Security AS
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
  *
  * Author(s):
  *	2011-2014 Arvid Brodin, arvid.brodin@alten.se
@@ -17,7 +13,6 @@
 #include "hsr_main.h"
 #include "hsr_framereg.h"
 
-
 struct hsr_node;
 
 struct hsr_frame_info {
@@ -32,7 +27,6 @@ struct hsr_frame_info {
 	bool is_local_exclusive;
 };
 
-
 /* The uses I can see for these HSR supervision frames are:
  * 1) Use the frames that are sent after node initialization ("HSR_TLV.Type =
  *    22") to reset any sequence_nr counters belonging to that node. Useful if
@@ -50,46 +44,45 @@ struct hsr_frame_info {
  */
 static bool is_supervision_frame(struct hsr_priv *hsr, struct sk_buff *skb)
 {
-	struct ethhdr *ethHdr;
-	struct hsr_sup_tag *hsrSupTag;
-	struct hsrv1_ethhdr_sp *hsrV1Hdr;
+	struct ethhdr *eth_hdr;
+	struct hsr_sup_tag *hsr_sup_tag;
+	struct hsrv1_ethhdr_sp *hsr_V1_hdr;
 
 	WARN_ON_ONCE(!skb_mac_header_was_set(skb));
-	ethHdr = (struct ethhdr *) skb_mac_header(skb);
+	eth_hdr = (struct ethhdr *)skb_mac_header(skb);
 
 	/* Correct addr? */
-	if (!ether_addr_equal(ethHdr->h_dest,
+	if (!ether_addr_equal(eth_hdr->h_dest,
 			      hsr->sup_multicast_addr))
 		return false;
 
 	/* Correct ether type?. */
-	if (!(ethHdr->h_proto == htons(ETH_P_PRP)
-			|| ethHdr->h_proto == htons(ETH_P_HSR)))
+	if (!(eth_hdr->h_proto == htons(ETH_P_PRP) ||
+	      eth_hdr->h_proto == htons(ETH_P_HSR)))
 		return false;
 
 	/* Get the supervision header from correct location. */
-	if (ethHdr->h_proto == htons(ETH_P_HSR)) { /* Okay HSRv1. */
-		hsrV1Hdr = (struct hsrv1_ethhdr_sp *) skb_mac_header(skb);
-		if (hsrV1Hdr->hsr.encap_proto != htons(ETH_P_PRP))
+	if (eth_hdr->h_proto == htons(ETH_P_HSR)) { /* Okay HSRv1. */
+		hsr_V1_hdr = (struct hsrv1_ethhdr_sp *)skb_mac_header(skb);
+		if (hsr_V1_hdr->hsr.encap_proto != htons(ETH_P_PRP))
 			return false;
 
-		hsrSupTag = &hsrV1Hdr->hsr_sup;
+		hsr_sup_tag = &hsr_V1_hdr->hsr_sup;
 	} else {
-		hsrSupTag = &((struct hsrv0_ethhdr_sp *) skb_mac_header(skb))->hsr_sup;
+		hsr_sup_tag =
+		     &((struct hsrv0_ethhdr_sp *)skb_mac_header(skb))->hsr_sup;
 	}
 
-	if ((hsrSupTag->HSR_TLV_Type != HSR_TLV_ANNOUNCE) &&
-	    (hsrSupTag->HSR_TLV_Type != HSR_TLV_LIFE_CHECK))
+	if (hsr_sup_tag->HSR_TLV_type != HSR_TLV_ANNOUNCE &&
+	    hsr_sup_tag->HSR_TLV_type != HSR_TLV_LIFE_CHECK)
 		return false;
-	if ((hsrSupTag->HSR_TLV_Length != 12) &&
-			(hsrSupTag->HSR_TLV_Length !=
-					sizeof(struct hsr_sup_payload)))
+	if (hsr_sup_tag->HSR_TLV_length != 12 &&
+	    hsr_sup_tag->HSR_TLV_length != sizeof(struct hsr_sup_payload))
 		return false;
 
 	return true;
 }
 
-
 static struct sk_buff *create_stripped_skb(struct sk_buff *skb_in,
 					   struct hsr_frame_info *frame)
 {
@@ -100,7 +93,7 @@ static struct sk_buff *create_stripped_skb(struct sk_buff *skb_in,
 	skb_pull(skb_in, HSR_HLEN);
 	skb = __pskb_copy(skb_in, skb_headroom(skb_in) - HSR_HLEN, GFP_ATOMIC);
 	skb_push(skb_in, HSR_HLEN);
-	if (skb == NULL)
+	if (!skb)
 		return NULL;
 
 	skb_reset_mac_header(skb);
@@ -108,7 +101,7 @@ static struct sk_buff *create_stripped_skb(struct sk_buff *skb_in,
 	if (skb->ip_summed == CHECKSUM_PARTIAL)
 		skb->csum_start -= HSR_HLEN;
 
-	copylen = 2*ETH_ALEN;
+	copylen = 2 * ETH_ALEN;
 	if (frame->is_vlan)
 		copylen += VLAN_HLEN;
 	src = skb_mac_header(skb_in);
@@ -127,9 +120,8 @@ static struct sk_buff *frame_get_stripped_skb(struct hsr_frame_info *frame,
 	return skb_clone(frame->skb_std, GFP_ATOMIC);
 }
 
-
 static void hsr_fill_tag(struct sk_buff *skb, struct hsr_frame_info *frame,
-			 struct hsr_port *port, u8 protoVersion)
+			 struct hsr_port *port, u8 proto_version)
 {
 	struct hsr_ethhdr *hsr_ethhdr;
 	int lane_id;
@@ -144,13 +136,13 @@ static void hsr_fill_tag(struct sk_buff *skb, struct hsr_frame_info *frame,
 	if (frame->is_vlan)
 		lsdu_size -= 4;
 
-	hsr_ethhdr = (struct hsr_ethhdr *) skb_mac_header(skb);
+	hsr_ethhdr = (struct hsr_ethhdr *)skb_mac_header(skb);
 
 	set_hsr_tag_path(&hsr_ethhdr->hsr_tag, lane_id);
 	set_hsr_tag_LSDU_size(&hsr_ethhdr->hsr_tag, lsdu_size);
 	hsr_ethhdr->hsr_tag.sequence_nr = htons(frame->sequence_nr);
 	hsr_ethhdr->hsr_tag.encap_proto = hsr_ethhdr->ethhdr.h_proto;
-	hsr_ethhdr->ethhdr.h_proto = htons(protoVersion ?
+	hsr_ethhdr->ethhdr.h_proto = htons(proto_version ?
 			ETH_P_HSR : ETH_P_PRP);
 }
 
@@ -164,7 +156,7 @@ static struct sk_buff *create_tagged_skb(struct sk_buff *skb_o,
 
 	/* Create the new skb with enough headroom to fit the HSR tag */
 	skb = __pskb_copy(skb_o, skb_headroom(skb_o) + HSR_HLEN, GFP_ATOMIC);
-	if (skb == NULL)
+	if (!skb)
 		return NULL;
 	skb_reset_mac_header(skb);
 
@@ -180,7 +172,7 @@ static struct sk_buff *create_tagged_skb(struct sk_buff *skb_o,
 	memmove(dst, src, movelen);
 	skb_reset_mac_header(skb);
 
-	hsr_fill_tag(skb, frame, port, port->hsr->protVersion);
+	hsr_fill_tag(skb, frame, port, port->hsr->prot_version);
 
 	return skb;
 }
@@ -194,7 +186,7 @@ static struct sk_buff *frame_get_tagged_skb(struct hsr_frame_info *frame,
 	if (frame->skb_hsr)
 		return skb_clone(frame->skb_hsr, GFP_ATOMIC);
 
-	if ((port->type != HSR_PT_SLAVE_A) && (port->type != HSR_PT_SLAVE_B)) {
+	if (port->type != HSR_PT_SLAVE_A && port->type != HSR_PT_SLAVE_B) {
 		WARN_ONCE(1, "HSR: Bug: trying to create a tagged frame for a non-ring port");
 		return NULL;
 	}
@@ -202,7 +194,6 @@ static struct sk_buff *frame_get_tagged_skb(struct hsr_frame_info *frame,
 	return create_tagged_skb(frame->skb_std, frame, port);
 }
 
-
 static void hsr_deliver_master(struct sk_buff *skb, struct net_device *dev,
 			       struct hsr_node *node_src)
 {
@@ -237,7 +228,6 @@ static int hsr_xmit(struct sk_buff *skb, struct hsr_port *port,
 	return dev_queue_xmit(skb);
 }
 
-
 /* Forward the frame through all devices except:
  * - Back through the receiving device
  * - If it's a HSR frame: through a device where it has passed before
@@ -260,11 +250,11 @@ static void hsr_forward_do(struct hsr_frame_info *frame)
 			continue;
 
 		/* Don't deliver locally unless we should */
-		if ((port->type == HSR_PT_MASTER) && !frame->is_local_dest)
+		if (port->type == HSR_PT_MASTER && !frame->is_local_dest)
 			continue;
 
 		/* Deliver frames directly addressed to us to master only */
-		if ((port->type != HSR_PT_MASTER) && frame->is_local_exclusive)
+		if (port->type != HSR_PT_MASTER && frame->is_local_exclusive)
 			continue;
 
 		/* Don't send frame over port where it has been sent before */
@@ -272,7 +262,7 @@ static void hsr_forward_do(struct hsr_frame_info *frame)
 					   frame->sequence_nr))
 			continue;
 
-		if (frame->is_supervision && (port->type == HSR_PT_MASTER)) {
+		if (frame->is_supervision && port->type == HSR_PT_MASTER) {
 			hsr_handle_sup_frame(frame->skb_hsr,
 					     frame->node_src,
 					     frame->port_rcv);
@@ -283,7 +273,7 @@ static void hsr_forward_do(struct hsr_frame_info *frame)
 			skb = frame_get_tagged_skb(frame, port);
 		else
 			skb = frame_get_stripped_skb(frame, port);
-		if (skb == NULL) {
+		if (!skb) {
 			/* FIXME: Record the dropped frame? */
 			continue;
 		}
@@ -296,7 +286,6 @@ static void hsr_forward_do(struct hsr_frame_info *frame)
 	}
 }
 
-
 static void check_local_dest(struct hsr_priv *hsr, struct sk_buff *skb,
 			     struct hsr_frame_info *frame)
 {
@@ -307,16 +296,15 @@ static void check_local_dest(struct hsr_priv *hsr, struct sk_buff *skb,
 		frame->is_local_exclusive = false;
 	}
 
-	if ((skb->pkt_type == PACKET_HOST) ||
-	    (skb->pkt_type == PACKET_MULTICAST) ||
-	    (skb->pkt_type == PACKET_BROADCAST)) {
+	if (skb->pkt_type == PACKET_HOST ||
+	    skb->pkt_type == PACKET_MULTICAST ||
+	    skb->pkt_type == PACKET_BROADCAST) {
 		frame->is_local_dest = true;
 	} else {
 		frame->is_local_dest = false;
 	}
 }
 
-
 static int hsr_fill_frame_info(struct hsr_frame_info *frame,
 			       struct sk_buff *skb, struct hsr_port *port)
 {
@@ -325,18 +313,18 @@ static int hsr_fill_frame_info(struct hsr_frame_info *frame,
 
 	frame->is_supervision = is_supervision_frame(port->hsr, skb);
 	frame->node_src = hsr_get_node(port, skb, frame->is_supervision);
-	if (frame->node_src == NULL)
+	if (!frame->node_src)
 		return -1; /* Unknown node and !is_supervision, or no mem */
 
-	ethhdr = (struct ethhdr *) skb_mac_header(skb);
+	ethhdr = (struct ethhdr *)skb_mac_header(skb);
 	frame->is_vlan = false;
 	if (ethhdr->h_proto == htons(ETH_P_8021Q)) {
 		frame->is_vlan = true;
 		/* FIXME: */
 		WARN_ONCE(1, "HSR: VLAN not yet supported");
 	}
-	if (ethhdr->h_proto == htons(ETH_P_PRP)
-			|| ethhdr->h_proto == htons(ETH_P_HSR)) {
+	if (ethhdr->h_proto == htons(ETH_P_PRP) ||
+	    ethhdr->h_proto == htons(ETH_P_HSR)) {
 		frame->skb_std = NULL;
 		frame->skb_hsr = skb;
 		frame->sequence_nr = hsr_get_skb_sequence_nr(skb);
@@ -372,9 +360,9 @@ void hsr_forward_skb(struct sk_buff *skb, struct hsr_port *port)
 	hsr_register_frame_in(frame.node_src, port, frame.sequence_nr);
 	hsr_forward_do(&frame);
 
-	if (frame.skb_hsr != NULL)
+	if (frame.skb_hsr)
 		kfree_skb(frame.skb_hsr);
-	if (frame.skb_std != NULL)
+	if (frame.skb_std)
 		kfree_skb(frame.skb_std);
 	return;
 

net/hsr/hsr_forward.h

+/* SPDX-License-Identifier: GPL-2.0 */
 /* Copyright 2011-2014 Autronica Fire and Security AS
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
  *
  * Author(s):
  *	2011-2014 Arvid Brodin, arvid.brodin@alten.se

net/hsr/hsr_framereg.h

+/* SPDX-License-Identifier: GPL-2.0 */
 /* Copyright 2011-2014 Autronica Fire and Security AS
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
  *
  * Author(s):
  *	2011-2014 Arvid Brodin, arvid.brodin@alten.se
@@ -52,4 +48,16 @@ int hsr_get_node_data(struct hsr_priv *hsr,
 		      int *if2_age,
 		      u16 *if2_seq);
 
+struct hsr_node {
+	struct list_head	mac_list;
+	unsigned char		macaddress_A[ETH_ALEN];
+	unsigned char		macaddress_B[ETH_ALEN];
+	/* Local slave through which AddrB frames are received from this node */
+	enum hsr_port_type	addr_B_port;
+	unsigned long		time_in[HSR_PT_PORTS];
+	bool			time_in_stale[HSR_PT_PORTS];
+	u16			seq_out[HSR_PT_PORTS];
+	struct rcu_head		rcu_head;
+};
+
 #endif /* __HSR_FRAMEREG_H */

net/hsr/hsr_main.c

+// SPDX-License-Identifier: GPL-2.0
 /* Copyright 2011-2014 Autronica Fire and Security AS
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
  *
  * Author(s):
  *	2011-2014 Arvid Brodin, arvid.brodin@alten.se
@@ -19,7 +15,6 @@
 #include "hsr_framereg.h"
 #include "hsr_slave.h"
 
-
 static int hsr_netdev_notify(struct notifier_block *nb, unsigned long event,
 			     void *ptr)
 {
@@ -31,12 +26,12 @@ static int hsr_netdev_notify(struct notifier_block *nb, unsigned long event,
 
 	dev = netdev_notifier_info_to_dev(ptr);
 	port = hsr_port_get_rtnl(dev);
-	if (port == NULL) {
+	if (!port) {
 		if (!is_hsr_master(dev))
 			return NOTIFY_DONE;	/* Not an HSR device */
 		hsr = netdev_priv(dev);
 		port = hsr_port_get_hsr(hsr, HSR_PT_MASTER);
-		if (port == NULL) {
+		if (!port) {
 			/* Resend of notification concerning removed device? */
 			return NOTIFY_DONE;
 		}
@@ -63,7 +58,8 @@ static int hsr_netdev_notify(struct notifier_block *nb, unsigned long event,
 
 		if (port->type == HSR_PT_SLAVE_A) {
 			ether_addr_copy(master->dev->dev_addr, dev->dev_addr);
-			call_netdevice_notifiers(NETDEV_CHANGEADDR, master->dev);
+			call_netdevice_notifiers(NETDEV_CHANGEADDR,
+						 master->dev);
 		}
 
 		/* Make sure we recognize frames from ourselves in hsr_rcv() */
@@ -97,7 +93,6 @@ static int hsr_netdev_notify(struct notifier_block *nb, unsigned long event,
 	return NOTIFY_DONE;
 }
 
-
 struct hsr_port *hsr_port_get_hsr(struct hsr_priv *hsr, enum hsr_port_type pt)
 {
 	struct hsr_port *port;
@@ -112,7 +107,6 @@ static struct notifier_block hsr_nb = {
 	.notifier_call = hsr_netdev_notify,	/* Slave event notifications */
 };
 
-
 static int __init hsr_init(void)
 {
 	int res;

net/hsr/hsr_main.h

+/* SPDX-License-Identifier: GPL-2.0 */
 /* Copyright 2011-2014 Autronica Fire and Security AS
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
  *
  * Author(s):
  *	2011-2014 Arvid Brodin, arvid.brodin@alten.se
@@ -15,7 +11,6 @@
 #include <linux/netdevice.h>
 #include <linux/list.h>
 
-
 /* Time constants as specified in the HSR specification (IEC-62439-3 2010)
  * Table 8.
  * All values in milliseconds.
@@ -24,7 +19,6 @@
 #define HSR_NODE_FORGET_TIME		60000 /* ms */
 #define HSR_ANNOUNCE_INTERVAL		  100 /* ms */
 
-
 /* By how much may slave1 and slave2 timestamps of latest received frame from
  * each node differ before we notify of communication problem?
  */
@@ -32,17 +26,14 @@
 #define HSR_SEQNR_START			(USHRT_MAX - 1024)
 #define HSR_SUP_SEQNR_START		(HSR_SEQNR_START / 2)
 
-
 /* How often shall we check for broken ring and remove node entries older than
  * HSR_NODE_FORGET_TIME?
  */
 #define PRUNE_PERIOD			 3000 /* ms */
 
-
 #define HSR_TLV_ANNOUNCE		   22
 #define HSR_TLV_LIFE_CHECK		   23
 
-
 /* HSR Tag.
  * As defined in IEC-62439-3:2010, the HSR tag is really { ethertype = 0x88FB,
  * path, LSDU_size, sequence Nr }. But we let eth_header() create { h_dest,
@@ -83,15 +74,14 @@ static inline u16 get_hsr_tag_LSDU_size(struct hsr_tag *ht)
 
 static inline void set_hsr_tag_path(struct hsr_tag *ht, u16 path)
 {
-	ht->path_and_LSDU_size = htons(
-			(ntohs(ht->path_and_LSDU_size) & 0x0FFF) | (path << 12));
+	ht->path_and_LSDU_size =
+		htons((ntohs(ht->path_and_LSDU_size) & 0x0FFF) | (path << 12));
 }
 
 static inline void set_hsr_tag_LSDU_size(struct hsr_tag *ht, u16 LSDU_size)
 {
-	ht->path_and_LSDU_size = htons(
-			(ntohs(ht->path_and_LSDU_size) & 0xF000) |
-			(LSDU_size & 0x0FFF));
+	ht->path_and_LSDU_size = htons((ntohs(ht->path_and_LSDU_size) &
+				       0xF000) | (LSDU_size & 0x0FFF));
 }
 
 struct hsr_ethhdr {
@@ -99,39 +89,38 @@ struct hsr_ethhdr {
 	struct hsr_tag	hsr_tag;
 } __packed;
 
-
 /* HSR Supervision Frame data types.
  * Field names as defined in the IEC:2010 standard for HSR.
  */
 struct hsr_sup_tag {
-	__be16		path_and_HSR_Ver;
+	__be16		path_and_HSR_ver;
 	__be16		sequence_nr;
-	__u8		HSR_TLV_Type;
-	__u8		HSR_TLV_Length;
+	__u8		HSR_TLV_type;
+	__u8		HSR_TLV_length;
 } __packed;
 
 struct hsr_sup_payload {
-	unsigned char	MacAddressA[ETH_ALEN];
+	unsigned char	macaddress_A[ETH_ALEN];
 } __packed;
 
 static inline u16 get_hsr_stag_path(struct hsr_sup_tag *hst)
 {
-	return get_hsr_tag_path((struct hsr_tag *) hst);
+	return get_hsr_tag_path((struct hsr_tag *)hst);
 }
 
 static inline u16 get_hsr_stag_HSR_ver(struct hsr_sup_tag *hst)
 {
-	return get_hsr_tag_LSDU_size((struct hsr_tag *) hst);
+	return get_hsr_tag_LSDU_size((struct hsr_tag *)hst);
 }
 
 static inline void set_hsr_stag_path(struct hsr_sup_tag *hst, u16 path)
 {
-	set_hsr_tag_path((struct hsr_tag *) hst, path);
+	set_hsr_tag_path((struct hsr_tag *)hst, path);
 }
 
-static inline void set_hsr_stag_HSR_Ver(struct hsr_sup_tag *hst, u16 HSR_Ver)
+static inline void set_hsr_stag_HSR_ver(struct hsr_sup_tag *hst, u16 HSR_ver)
 {
-	set_hsr_tag_LSDU_size((struct hsr_tag *) hst, HSR_Ver);
+	set_hsr_tag_LSDU_size((struct hsr_tag *)hst, HSR_ver);
 }
 
 struct hsrv0_ethhdr_sp {
@@ -145,7 +134,6 @@ struct hsrv1_ethhdr_sp {
 	struct hsr_sup_tag	hsr_sup;
 } __packed;
 
-
 enum hsr_port_type {
 	HSR_PT_NONE = 0,	/* Must be 0, used by framereg */
 	HSR_PT_SLAVE_A,
@@ -171,10 +159,14 @@ struct hsr_priv {
 	struct timer_list	prune_timer;
 	int announce_count;
 	u16 sequence_nr;
-	u16 sup_sequence_nr;			/* For HSRv1 separate seq_nr for supervision */
-	u8 protVersion;					/* Indicate if HSRv0 or HSRv1. */
+	u16 sup_sequence_nr;	/* For HSRv1 separate seq_nr for supervision */
+	u8 prot_version;		/* Indicate if HSRv0 or HSRv1. */
 	spinlock_t seqnr_lock;			/* locking for sequence_nr */
 	unsigned char		sup_multicast_addr[ETH_ALEN];
+#ifdef	CONFIG_DEBUG_FS
+	struct dentry *node_tbl_root;
+	struct dentry *node_tbl_file;
+#endif
 };
 
 #define hsr_for_each_port(hsr, port) \
@@ -187,8 +179,21 @@ static inline u16 hsr_get_skb_sequence_nr(struct sk_buff *skb)
 {
 	struct hsr_ethhdr *hsr_ethhdr;
 
-	hsr_ethhdr = (struct hsr_ethhdr *) skb_mac_header(skb);
+	hsr_ethhdr = (struct hsr_ethhdr *)skb_mac_header(skb);
 	return ntohs(hsr_ethhdr->hsr_tag.sequence_nr);
 }
 
+#if IS_ENABLED(CONFIG_DEBUG_FS)
+int hsr_prp_debugfs_init(struct hsr_priv *priv);
+void hsr_prp_debugfs_term(struct hsr_priv *priv);
+#else
+static inline int hsr_prp_debugfs_init(struct hsr_priv *priv)
+{
+	return 0;
+}
+
+static inline void hsr_prp_debugfs_term(struct hsr_priv *priv)
+{}
+#endif
+
 #endif /*  __HSR_PRIVATE_H */

net/hsr/hsr_netlink.c

+// SPDX-License-Identifier: GPL-2.0
 /* Copyright 2011-2014 Autronica Fire and Security AS
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
  *
  * Author(s):
  *	2011-2014 Arvid Brodin, arvid.brodin@alten.se
@@ -28,7 +24,6 @@ static const struct nla_policy hsr_policy[IFLA_HSR_MAX + 1] = {
 	[IFLA_HSR_SEQ_NR]		= { .type = NLA_U16 },
 };
 
-
 /* Here, it seems a netdevice has already been allocated for us, and the
  * hsr_dev_setup routine has been executed. Nice!
  */
@@ -47,12 +42,14 @@ static int hsr_newlink(struct net *src_net, struct net_device *dev,
 		netdev_info(dev, "HSR: Slave1 device not specified\n");
 		return -EINVAL;
 	}
-	link[0] = __dev_get_by_index(src_net, nla_get_u32(data[IFLA_HSR_SLAVE1]));
+	link[0] = __dev_get_by_index(src_net,
+				     nla_get_u32(data[IFLA_HSR_SLAVE1]));
 	if (!data[IFLA_HSR_SLAVE2]) {
 		netdev_info(dev, "HSR: Slave2 device not specified\n");
 		return -EINVAL;
 	}
-	link[1] = __dev_get_by_index(src_net, nla_get_u32(data[IFLA_HSR_SLAVE2]));
+	link[1] = __dev_get_by_index(src_net,
+				     nla_get_u32(data[IFLA_HSR_SLAVE2]));
 
 	if (!link[0] || !link[1])
 		return -ENODEV;
@@ -119,8 +116,6 @@ static struct rtnl_link_ops hsr_link_ops __read_mostly = {
 	.fill_info	= hsr_fill_info,
 };
 
-
-
 /* attribute policy */
 static const struct nla_policy hsr_genl_policy[HSR_A_MAX + 1] = {
 	[HSR_A_NODE_ADDR] = { .len = ETH_ALEN },
@@ -138,8 +133,6 @@ static const struct genl_multicast_group hsr_mcgrps[] = {
 	{ .name = "hsr-network", },
 };
 
-
-
 /* This is called if for some node with MAC address addr, we only get frames
  * over one of the slave interfaces. This would indicate an open network ring
  * (i.e. a link has failed somewhere).
@@ -156,7 +149,8 @@ void hsr_nl_ringerror(struct hsr_priv *hsr, unsigned char addr[ETH_ALEN],
 	if (!skb)
 		goto fail;
 
-	msg_head = genlmsg_put(skb, 0, 0, &hsr_genl_family, 0, HSR_C_RING_ERROR);
+	msg_head = genlmsg_put(skb, 0, 0, &hsr_genl_family, 0,
+			       HSR_C_RING_ERROR);
 	if (!msg_head)
 		goto nla_put_failure;
 
@@ -201,7 +195,6 @@ void hsr_nl_nodedown(struct hsr_priv *hsr, unsigned char addr[ETH_ALEN])
 	if (!msg_head)
 		goto nla_put_failure;
 
-
 	res = nla_put(skb, HSR_A_NODE_ADDR, ETH_ALEN, addr);
 	if (res < 0)
 		goto nla_put_failure;
@@ -221,7 +214,6 @@ void hsr_nl_nodedown(struct hsr_priv *hsr, unsigned char addr[ETH_ALEN])
 	rcu_read_unlock();
 }
 
-
 /* HSR_C_GET_NODE_STATUS lets userspace query the internal HSR node table
  * about the status of a specific node in the network, defined by its MAC
  * address.
@@ -260,15 +252,13 @@ static int hsr_get_node_status(struct sk_buff *skb_in, struct genl_info *info)
 		goto invalid;
 
 	hsr_dev = __dev_get_by_index(genl_info_net(info),
-					nla_get_u32(info->attrs[HSR_A_IFINDEX]));
+				     nla_get_u32(info->attrs[HSR_A_IFINDEX]));
 	if (!hsr_dev)
 		goto invalid;
 	if (!is_hsr_master(hsr_dev))
 		goto invalid;
 
-
 	/* Send reply */
-
 	skb_out = genlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
 	if (!skb_out) {
 		res = -ENOMEM;
@@ -276,8 +266,8 @@ static int hsr_get_node_status(struct sk_buff *skb_in, struct genl_info *info)
 	}
 
 	msg_head = genlmsg_put(skb_out, NETLINK_CB(skb_in).portid,
-				info->snd_seq, &hsr_genl_family, 0,
-				HSR_C_SET_NODE_STATUS);
+			       info->snd_seq, &hsr_genl_family, 0,
+			       HSR_C_SET_NODE_STATUS);
 	if (!msg_head) {
 		res = -ENOMEM;
 		goto nla_put_failure;
@@ -289,28 +279,30 @@ static int hsr_get_node_status(struct sk_buff *skb_in, struct genl_info *info)
 
 	hsr = netdev_priv(hsr_dev);
 	res = hsr_get_node_data(hsr,
-			(unsigned char *) nla_data(info->attrs[HSR_A_NODE_ADDR]),
-			hsr_node_addr_b,
-			&addr_b_ifindex,
-			&hsr_node_if1_age,
-			&hsr_node_if1_seq,
-			&hsr_node_if2_age,
-			&hsr_node_if2_seq);
+				(unsigned char *)
+				nla_data(info->attrs[HSR_A_NODE_ADDR]),
+					 hsr_node_addr_b,
+					 &addr_b_ifindex,
+					 &hsr_node_if1_age,
+					 &hsr_node_if1_seq,
+					 &hsr_node_if2_age,
+					 &hsr_node_if2_seq);
 	if (res < 0)
 		goto nla_put_failure;
 
 	res = nla_put(skb_out, HSR_A_NODE_ADDR, ETH_ALEN,
-					nla_data(info->attrs[HSR_A_NODE_ADDR]));
+		      nla_data(info->attrs[HSR_A_NODE_ADDR]));
 	if (res < 0)
 		goto nla_put_failure;
 
 	if (addr_b_ifindex > -1) {
 		res = nla_put(skb_out, HSR_A_NODE_ADDR_B, ETH_ALEN,
-								hsr_node_addr_b);
+			      hsr_node_addr_b);
 		if (res < 0)
 			goto nla_put_failure;
 
-		res = nla_put_u32(skb_out, HSR_A_ADDR_B_IFINDEX, addr_b_ifindex);
+		res = nla_put_u32(skb_out, HSR_A_ADDR_B_IFINDEX,
+				  addr_b_ifindex);
 		if (res < 0)
 			goto nla_put_failure;
 	}
@@ -392,9 +384,7 @@ static int hsr_get_node_list(struct sk_buff *skb_in, struct genl_info *info)
 	if (!is_hsr_master(hsr_dev))
 		goto invalid;
 
-
 	/* Send reply */
-
 	skb_out = genlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
 	if (!skb_out) {
 		res = -ENOMEM;
@@ -402,8 +392,8 @@ static int hsr_get_node_list(struct sk_buff *skb_in, struct genl_info *info)
 	}
 
 	msg_head = genlmsg_put(skb_out, NETLINK_CB(skb_in).portid,
-				info->snd_seq, &hsr_genl_family, 0,
-				HSR_C_SET_NODE_LIST);
+			       info->snd_seq, &hsr_genl_family, 0,
+			       HSR_C_SET_NODE_LIST);
 	if (!msg_head) {
 		res = -ENOMEM;
 		goto nla_put_failure;
@@ -444,7 +434,6 @@ static int hsr_get_node_list(struct sk_buff *skb_in, struct genl_info *info)
 	return res;
 }
 
-
 static const struct genl_ops hsr_ops[] = {
 	{
 		.cmd = HSR_C_GET_NODE_STATUS,

net/hsr/hsr_netlink.h

+/* SPDX-License-Identifier: GPL-2.0 */
 /* Copyright 2011-2014 Autronica Fire and Security AS
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
  *
  * Author(s):
  *	2011-2014 Arvid Brodin, arvid.brodin@alten.se

net/hsr/hsr_prp_debugfs.c

+/*
+ * hsr_prp_debugfs code
+ * Copyright (C) 2017 Texas Instruments Incorporated
+ *
+ * Author(s):
+ *	Murali Karicheri <m-karicheri2@ti.com?
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+#include <linux/module.h>
+#include <linux/errno.h>
+#include <linux/debugfs.h>
+#include "hsr_main.h"
+#include "hsr_framereg.h"
+
+static void print_mac_address(struct seq_file *sfp, unsigned char *mac)
+{
+	seq_printf(sfp, "%02x:%02x:%02x:%02x:%02x:%02x:",
+		   mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);
+}
+
+/* hsr_prp_node_table_show - Formats and prints node_table entries */
+static int
+hsr_prp_node_table_show(struct seq_file *sfp, void *data)
+{
+	struct hsr_priv *priv = (struct hsr_priv *)sfp->private;
+	struct hsr_node *node;
+
+	seq_puts(sfp, "Node Table entries\n");
+	seq_puts(sfp, "MAC-Address-A,   MAC-Address-B, time_in[A], ");
+	seq_puts(sfp, "time_in[B], Address-B port\n");
+	rcu_read_lock();
+	list_for_each_entry_rcu(node, &priv->node_db, mac_list) {
+		/* skip self node */
+		if (hsr_addr_is_self(priv, node->macaddress_A))
+			continue;
+		print_mac_address(sfp, &node->macaddress_A[0]);
+		seq_puts(sfp, " ");
+		print_mac_address(sfp, &node->macaddress_B[0]);
+		seq_printf(sfp, "0x%lx, ", node->time_in[HSR_PT_SLAVE_A]);
+		seq_printf(sfp, "0x%lx ", node->time_in[HSR_PT_SLAVE_B]);
+		seq_printf(sfp, "0x%x\n", node->addr_B_port);
+	}
+	rcu_read_unlock();
+	return 0;
+}
+
+/* hsr_prp_node_table_open - Open the node_table file
+ *
+ * Description:
+ * This routine opens a debugfs file node_table of specific hsr device
+ */
+static int
+hsr_prp_node_table_open(struct inode *inode, struct file *filp)
+{
+	return single_open(filp, hsr_prp_node_table_show, inode->i_private);
+}
+
+static const struct file_operations hsr_prp_fops = {
+	.owner	= THIS_MODULE,
+	.open	= hsr_prp_node_table_open,
+	.read	= seq_read,
+	.llseek = seq_lseek,
+	.release = single_release,
+};
+
+/* hsr_prp_debugfs_init - create hsr-prp node_table file for dumping
+ * the node table
+ *
+ * Description:
+ * When debugfs is configured this routine sets up the node_table file per
+ * hsr/prp device for dumping the node_table entries
+ */
+int hsr_prp_debugfs_init(struct hsr_priv *priv)
+{
+	int rc = -1;
+	struct dentry *de = NULL;
+
+	de = debugfs_create_dir("hsr", NULL);
+	if (!de) {
+		pr_err("Cannot create hsr-prp debugfs root\n");
+		return rc;
+	}
+
+	priv->node_tbl_root = de;
+
+	de = debugfs_create_file("node_table", S_IFREG | 0444,
+				 priv->node_tbl_root, priv,
+				 &hsr_prp_fops);
+	if (!de) {
+		pr_err("Cannot create hsr-prp node_table directory\n");
+		return rc;
+	}
+	priv->node_tbl_file = de;
+	rc = 0;
+
+	return rc;
+}
+
+/* hsr_prp_debugfs_term - Tear down debugfs intrastructure
+ *
+ * Description:
+ * When Debufs is configured this routine removes debugfs file system
+ * elements that are specific to hsr-prp
+ */
+void
+hsr_prp_debugfs_term(struct hsr_priv *priv)
+{
+	debugfs_remove(priv->node_tbl_file);
+	priv->node_tbl_file = NULL;
+	debugfs_remove(priv->node_tbl_root);
+	priv->node_tbl_root = NULL;
+}

net/hsr/hsr_slave.c

+// SPDX-License-Identifier: GPL-2.0
 /* Copyright 2011-2014 Autronica Fire and Security AS
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
  *
  * Author(s):
  *	2011-2014 Arvid Brodin, arvid.brodin@alten.se
@@ -18,7 +14,6 @@
 #include "hsr_forward.h"
 #include "hsr_framereg.h"
 
-
 static rx_handler_result_t hsr_handle_frame(struct sk_buff **pskb)
 {
 	struct sk_buff *skb = *pskb;
@@ -61,12 +56,11 @@ bool hsr_port_exists(const struct net_device *dev)
 	return rcu_access_pointer(dev->rx_handler) == hsr_handle_frame;
 }
 
-
 static int hsr_check_dev_ok(struct net_device *dev)
 {
 	/* Don't allow HSR on non-ethernet like devices */
-	if ((dev->flags & IFF_LOOPBACK) || (dev->type != ARPHRD_ETHER) ||
-	    (dev->addr_len != ETH_ALEN)) {
+	if ((dev->flags & IFF_LOOPBACK) || dev->type != ARPHRD_ETHER ||
+	    dev->addr_len != ETH_ALEN) {
 		netdev_info(dev, "Cannot use loopback or non-ethernet device as HSR slave.\n");
 		return -EINVAL;
 	}
@@ -99,7 +93,6 @@ static int hsr_check_dev_ok(struct net_device *dev)
 	return 0;
 }
 
-
 /* Setup device to be added to the HSR bridge. */
 static int hsr_portdev_setup(struct net_device *dev, struct hsr_port *port)
 {
@@ -143,11 +136,11 @@ int hsr_add_port(struct hsr_priv *hsr, struct net_device *dev,
 	}
 
 	port = hsr_port_get_hsr(hsr, type);
-	if (port != NULL)
+	if (port)
 		return -EBUSY;	/* This port already exists */
 
 	port = kzalloc(sizeof(*port), GFP_KERNEL);
-	if (port == NULL)
+	if (!port)
 		return -ENOMEM;
 
 	if (type != HSR_PT_MASTER) {
@@ -184,7 +177,7 @@ void hsr_del_port(struct hsr_port *port)
 	list_del_rcu(&port->port_list);
 
 	if (port != master) {
-		if (master != NULL) {
+		if (master) {
 			netdev_update_features(master->dev);
 			dev_set_mtu(master->dev, hsr_get_max_mtu(hsr));
 		}

net/hsr/hsr_slave.h

+/* SPDX-License-Identifier: GPL-2.0 */
 /* Copyright 2011-2014 Autronica Fire and Security AS
  *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * Author(s):
  *	2011-2014 Arvid Brodin, arvid.brodin@alten.se
  */