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Message-ID: <53B71E1C.1030806@alten.se>
Date: Fri, 4 Jul 2014 23:35:24 +0200
From: Arvid Brodin <arvid.brodin@...en.se>
To: "David S. Miller" <davem@...emloft.net>
CC: "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: [PATCH net-next 02/10] net/hsr: Switch from dev_add_pack() to netdev_rx_handler_register()
Also move the frame receive handler to hsr_slave.c.
Signed-off-by: Arvid Brodin <arvid.brodin@...en.se>
---
net/hsr/Makefile | 3 +-
net/hsr/hsr_device.c | 13 ++-
net/hsr/hsr_main.c | 248 +--------------------------------------------------
net/hsr/hsr_main.h | 3 +
net/hsr/hsr_slave.c | 243 +++++++++++++++++++++++++++++++++++++++++++++++++
net/hsr/hsr_slave.h | 20 +++++
6 files changed, 283 insertions(+), 247 deletions(-)
create mode 100644 net/hsr/hsr_slave.c
create mode 100644 net/hsr/hsr_slave.h
diff --git a/net/hsr/Makefile b/net/hsr/Makefile
index b68359f..b533b24 100644
--- a/net/hsr/Makefile
+++ b/net/hsr/Makefile
@@ -4,4 +4,5 @@
obj-$(CONFIG_HSR) += hsr.o
-hsr-y := hsr_main.o hsr_framereg.o hsr_device.o hsr_netlink.o
+hsr-y := hsr_main.o hsr_framereg.o hsr_device.o hsr_netlink.o \
+ hsr_slave.o
diff --git a/net/hsr/hsr_device.c b/net/hsr/hsr_device.c
index 4dc2a42..4e5d92a 100644
--- a/net/hsr/hsr_device.c
+++ b/net/hsr/hsr_device.c
@@ -19,6 +19,7 @@
#include <linux/rtnetlink.h>
#include <linux/pkt_sched.h>
#include "hsr_device.h"
+#include "hsr_slave.h"
#include "hsr_framereg.h"
#include "hsr_main.h"
@@ -393,7 +394,6 @@ static void restore_slaves(struct net_device *hsr_dev)
rtnl_lock();
- /* Restore promiscuity */
for (i = 0; i < HSR_MAX_SLAVE; i++) {
if (!hsr->slave[i])
continue;
@@ -402,8 +402,12 @@ static void restore_slaves(struct net_device *hsr_dev)
netdev_info(hsr_dev,
"Cannot restore slave promiscuity (%s, %d)\n",
hsr->slave[i]->name, res);
+
+ if (hsr->slave[i]->rx_handler == hsr_handle_frame)
+ netdev_rx_handler_unregister(hsr->slave[i]);
}
+
rtnl_unlock();
}
@@ -575,6 +579,13 @@ int hsr_dev_finalize(struct net_device *hsr_dev, struct net_device *slave[2],
}
}
+ for (i = 0; i < HSR_MAX_SLAVE; i++) {
+ res = netdev_rx_handler_register(slave[i], hsr_handle_frame,
+ hsr);
+ if (res)
+ goto fail;
+ }
+
/* Make sure we recognize frames from ourselves in hsr_rcv() */
res = hsr_create_self_node(&hsr->self_node_db, hsr_dev->dev_addr,
hsr->slave[1]->dev_addr);
diff --git a/net/hsr/hsr_main.c b/net/hsr/hsr_main.c
index 99b8fc4..bcda901 100644
--- a/net/hsr/hsr_main.c
+++ b/net/hsr/hsr_main.c
@@ -7,10 +7,6 @@
*
* Author(s):
* 2011-2014 Arvid Brodin, arvid.brodin@...en.se
- *
- * In addition to routines for registering and unregistering HSR support, this
- * file also contains the receive routine that handles all incoming frames with
- * Ethertype (protocol) ETH_P_PRP (HSRv0), and network device event handling.
*/
#include <linux/netdevice.h>
@@ -56,11 +52,10 @@ bool is_hsr_slave(struct net_device *dev)
return false;
}
-
/* If dev is a HSR slave device, return the virtual master device. Return NULL
* otherwise.
*/
-static struct hsr_priv *get_hsr_master(struct net_device *dev)
+struct hsr_priv *get_hsr_master(struct net_device *dev)
{
struct hsr_priv *hsr;
@@ -76,12 +71,11 @@ static struct hsr_priv *get_hsr_master(struct net_device *dev)
return NULL;
}
-
/* If dev is a HSR slave device, return the other slave device. Return NULL
* otherwise.
*/
-static struct net_device *get_other_slave(struct hsr_priv *hsr,
- struct net_device *dev)
+struct net_device *get_other_slave(struct hsr_priv *hsr,
+ struct net_device *dev)
{
if (dev == hsr->slave[0])
return hsr->slave[1];
@@ -197,239 +191,6 @@ static void prune_nodes_all(unsigned long data)
}
-static struct sk_buff *hsr_pull_tag(struct sk_buff *skb)
-{
- struct hsr_tag *hsr_tag;
- struct sk_buff *skb2;
-
- skb2 = skb_share_check(skb, GFP_ATOMIC);
- if (unlikely(!skb2))
- goto err_free;
- skb = skb2;
-
- if (unlikely(!pskb_may_pull(skb, HSR_HLEN)))
- goto err_free;
-
- hsr_tag = (struct hsr_tag *) skb->data;
- skb->protocol = hsr_tag->encap_proto;
- skb_pull(skb, HSR_HLEN);
-
- return skb;
-
-err_free:
- kfree_skb(skb);
- return NULL;
-}
-
-
-/* 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
- * the other node's counter has been reset for some reason.
- * --
- * Or not - resetting the counter and bridging the frame would create a
- * loop, unfortunately.
- *
- * 2) Use the LifeCheck frames to detect ring breaks. I.e. if no LifeCheck
- * frame is received from a particular node, we know something is wrong.
- * We just register these (as with normal frames) and throw them away.
- *
- * 3) Allow different MAC addresses for the two slave interfaces, using the
- * MacAddressA field.
- */
-static bool is_supervision_frame(struct hsr_priv *hsr, struct sk_buff *skb)
-{
- struct hsr_sup_tag *hsr_stag;
-
- if (!ether_addr_equal(eth_hdr(skb)->h_dest,
- hsr->sup_multicast_addr))
- return false;
-
- hsr_stag = (struct hsr_sup_tag *) skb->data;
- if (get_hsr_stag_path(hsr_stag) != 0x0f)
- return false;
- if ((hsr_stag->HSR_TLV_Type != HSR_TLV_ANNOUNCE) &&
- (hsr_stag->HSR_TLV_Type != HSR_TLV_LIFE_CHECK))
- return false;
- if (hsr_stag->HSR_TLV_Length != 12)
- return false;
-
- return true;
-}
-
-
-/* Implementation somewhat according to IEC-62439-3, p. 43
- */
-static int hsr_rcv(struct sk_buff *skb, struct net_device *dev,
- struct packet_type *pt, struct net_device *orig_dev)
-{
- struct hsr_priv *hsr;
- struct net_device *other_slave;
- struct hsr_node *node;
- bool deliver_to_self;
- struct sk_buff *skb_deliver;
- enum hsr_dev_idx dev_in_idx, dev_other_idx;
- bool dup_out;
- int ret;
-
- hsr = get_hsr_master(dev);
-
- if (!hsr) {
- /* Non-HSR-slave device 'dev' is connected to a HSR network */
- kfree_skb(skb);
- dev->stats.rx_errors++;
- return NET_RX_SUCCESS;
- }
-
- if (dev == hsr->slave[0]) {
- dev_in_idx = HSR_DEV_SLAVE_A;
- dev_other_idx = HSR_DEV_SLAVE_B;
- } else {
- dev_in_idx = HSR_DEV_SLAVE_B;
- dev_other_idx = HSR_DEV_SLAVE_A;
- }
-
- node = hsr_find_node(&hsr->self_node_db, skb);
- if (node) {
- /* Always kill frames sent by ourselves */
- kfree_skb(skb);
- return NET_RX_SUCCESS;
- }
-
- /* Is this frame a candidate for local reception? */
- deliver_to_self = false;
- if ((skb->pkt_type == PACKET_HOST) ||
- (skb->pkt_type == PACKET_MULTICAST) ||
- (skb->pkt_type == PACKET_BROADCAST))
- deliver_to_self = true;
- else if (ether_addr_equal(eth_hdr(skb)->h_dest,
- hsr->dev->dev_addr)) {
- skb->pkt_type = PACKET_HOST;
- deliver_to_self = true;
- }
-
-
- rcu_read_lock(); /* node_db */
- node = hsr_find_node(&hsr->node_db, skb);
-
- if (is_supervision_frame(hsr, skb)) {
- skb_pull(skb, sizeof(struct hsr_sup_tag));
- node = hsr_merge_node(hsr, node, skb, dev_in_idx);
- if (!node) {
- rcu_read_unlock(); /* node_db */
- kfree_skb(skb);
- hsr->dev->stats.rx_dropped++;
- return NET_RX_DROP;
- }
- skb_push(skb, sizeof(struct hsr_sup_tag));
- deliver_to_self = false;
- }
-
- if (!node) {
- /* Source node unknown; this might be a HSR frame from
- * another net (different multicast address). Ignore it.
- */
- rcu_read_unlock(); /* node_db */
- kfree_skb(skb);
- return NET_RX_SUCCESS;
- }
-
- /* Register ALL incoming frames as outgoing through the other interface.
- * This allows us to register frames as incoming only if they are valid
- * for the receiving interface, without using a specific counter for
- * incoming frames.
- */
- dup_out = hsr_register_frame_out(node, dev_other_idx, skb);
- if (!dup_out)
- hsr_register_frame_in(node, dev_in_idx);
-
- /* Forward this frame? */
- if (!dup_out && (skb->pkt_type != PACKET_HOST))
- other_slave = get_other_slave(hsr, dev);
- else
- other_slave = NULL;
-
- if (hsr_register_frame_out(node, HSR_DEV_MASTER, skb))
- deliver_to_self = false;
-
- rcu_read_unlock(); /* node_db */
-
- if (!deliver_to_self && !other_slave) {
- kfree_skb(skb);
- /* Circulated frame; silently remove it. */
- return NET_RX_SUCCESS;
- }
-
- skb_deliver = skb;
- if (deliver_to_self && other_slave) {
- /* skb_clone() is not enough since we will strip the hsr tag
- * and do address substitution below
- */
- skb_deliver = pskb_copy(skb, GFP_ATOMIC);
- if (!skb_deliver) {
- deliver_to_self = false;
- hsr->dev->stats.rx_dropped++;
- }
- }
-
- if (deliver_to_self) {
- bool multicast_frame;
-
- skb_deliver = hsr_pull_tag(skb_deliver);
- if (!skb_deliver) {
- hsr->dev->stats.rx_dropped++;
- goto forward;
- }
-#if !defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)
- /* Move everything in the header that is after the HSR tag,
- * to work around alignment problems caused by the 6-byte HSR
- * tag. In practice, this removes/overwrites the HSR tag in
- * the header and restores a "standard" packet.
- */
- memmove(skb_deliver->data - HSR_HLEN, skb_deliver->data,
- skb_headlen(skb_deliver));
-
- /* Adjust skb members so they correspond with the move above.
- * This cannot possibly underflow skb->data since hsr_pull_tag()
- * above succeeded.
- * At this point in the protocol stack, the transport and
- * network headers have not been set yet, and we haven't touched
- * the mac header nor the head. So we only need to adjust data
- * and tail:
- */
- skb_deliver->data -= HSR_HLEN;
- skb_deliver->tail -= HSR_HLEN;
-#endif
- skb_deliver->dev = hsr->dev;
- hsr_addr_subst_source(hsr, skb_deliver);
- multicast_frame = (skb_deliver->pkt_type == PACKET_MULTICAST);
- ret = netif_rx(skb_deliver);
- if (ret == NET_RX_DROP) {
- hsr->dev->stats.rx_dropped++;
- } else {
- hsr->dev->stats.rx_packets++;
- hsr->dev->stats.rx_bytes += skb->len;
- if (multicast_frame)
- hsr->dev->stats.multicast++;
- }
- }
-
-forward:
- if (other_slave) {
- skb_push(skb, ETH_HLEN);
- skb->dev = other_slave;
- dev_queue_xmit(skb);
- }
-
- return NET_RX_SUCCESS;
-}
-
-
-static struct packet_type hsr_pt __read_mostly = {
- .type = htons(ETH_P_PRP),
- .func = hsr_rcv,
-};
-
static struct notifier_block hsr_nb = {
.notifier_call = hsr_netdev_notify, /* Slave event notifications */
};
@@ -441,8 +202,6 @@ static int __init hsr_init(void)
BUILD_BUG_ON(sizeof(struct hsr_tag) != HSR_HLEN);
- dev_add_pack(&hsr_pt);
-
init_timer(&prune_timer);
prune_timer.function = prune_nodes_all;
prune_timer.data = 0;
@@ -461,7 +220,6 @@ static void __exit hsr_exit(void)
unregister_netdevice_notifier(&hsr_nb);
del_timer_sync(&prune_timer);
hsr_netlink_exit();
- dev_remove_pack(&hsr_pt);
}
module_init(hsr_init);
diff --git a/net/hsr/hsr_main.h b/net/hsr/hsr_main.h
index 360a49a..d919321 100644
--- a/net/hsr/hsr_main.h
+++ b/net/hsr/hsr_main.h
@@ -162,5 +162,8 @@ struct hsr_priv {
void register_hsr_master(struct hsr_priv *hsr);
void unregister_hsr_master(struct hsr_priv *hsr);
bool is_hsr_slave(struct net_device *dev);
+struct hsr_priv *get_hsr_master(struct net_device *dev);
+struct net_device *get_other_slave(struct hsr_priv *hsr,
+ struct net_device *dev);
#endif /* __HSR_PRIVATE_H */
diff --git a/net/hsr/hsr_slave.c b/net/hsr/hsr_slave.c
new file mode 100644
index 0000000..7028146
--- /dev/null
+++ b/net/hsr/hsr_slave.c
@@ -0,0 +1,243 @@
+/* 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@...en.se
+ */
+
+#include "hsr_slave.h"
+#include <linux/etherdevice.h>
+#include "hsr_main.h"
+#include "hsr_framereg.h"
+
+
+static struct sk_buff *hsr_pull_tag(struct sk_buff *skb)
+{
+ struct hsr_tag *hsr_tag;
+ struct sk_buff *skb2;
+
+ skb2 = skb_share_check(skb, GFP_ATOMIC);
+ if (unlikely(!skb2))
+ goto err_free;
+ skb = skb2;
+
+ if (unlikely(!pskb_may_pull(skb, HSR_HLEN)))
+ goto err_free;
+
+ hsr_tag = (struct hsr_tag *) skb->data;
+ skb->protocol = hsr_tag->encap_proto;
+ skb_pull(skb, HSR_HLEN);
+
+ return skb;
+
+err_free:
+ kfree_skb(skb);
+ return NULL;
+}
+
+
+/* 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
+ * the other node's counter has been reset for some reason.
+ * --
+ * Or not - resetting the counter and bridging the frame would create a
+ * loop, unfortunately.
+ *
+ * 2) Use the LifeCheck frames to detect ring breaks. I.e. if no LifeCheck
+ * frame is received from a particular node, we know something is wrong.
+ * We just register these (as with normal frames) and throw them away.
+ *
+ * 3) Allow different MAC addresses for the two slave interfaces, using the
+ * MacAddressA field.
+ */
+static bool is_supervision_frame(struct hsr_priv *hsr, struct sk_buff *skb)
+{
+ struct hsr_sup_tag *hsr_stag;
+
+ if (!ether_addr_equal(eth_hdr(skb)->h_dest,
+ hsr->sup_multicast_addr))
+ return false;
+
+ hsr_stag = (struct hsr_sup_tag *) skb->data;
+ if (get_hsr_stag_path(hsr_stag) != 0x0f)
+ return false;
+ if ((hsr_stag->HSR_TLV_Type != HSR_TLV_ANNOUNCE) &&
+ (hsr_stag->HSR_TLV_Type != HSR_TLV_LIFE_CHECK))
+ return false;
+ if (hsr_stag->HSR_TLV_Length != 12)
+ return false;
+
+ return true;
+}
+
+
+/* Implementation somewhat according to IEC-62439-3, p. 43
+ */
+rx_handler_result_t hsr_handle_frame(struct sk_buff **pskb)
+{
+ struct sk_buff *skb = *pskb;
+ struct net_device *dev = skb->dev;
+ struct hsr_priv *hsr;
+ struct net_device *other_slave;
+ struct hsr_node *node;
+ bool deliver_to_self;
+ struct sk_buff *skb_deliver;
+ enum hsr_dev_idx dev_in_idx, dev_other_idx;
+ bool dup_out;
+ int ret;
+
+ if (eth_hdr(skb)->h_proto != htons(ETH_P_PRP))
+ return RX_HANDLER_PASS;
+
+ hsr = get_hsr_master(dev);
+ if (!hsr) {
+ WARN_ON_ONCE(1);
+ return RX_HANDLER_PASS;
+ }
+
+ if (dev == hsr->slave[0]) {
+ dev_in_idx = HSR_DEV_SLAVE_A;
+ dev_other_idx = HSR_DEV_SLAVE_B;
+ } else {
+ dev_in_idx = HSR_DEV_SLAVE_B;
+ dev_other_idx = HSR_DEV_SLAVE_A;
+ }
+
+ node = hsr_find_node(&hsr->self_node_db, skb);
+ if (node) {
+ /* Always kill frames sent by ourselves */
+ kfree_skb(skb);
+ return RX_HANDLER_CONSUMED;
+ }
+
+ /* Is this frame a candidate for local reception? */
+ deliver_to_self = false;
+ if ((skb->pkt_type == PACKET_HOST) ||
+ (skb->pkt_type == PACKET_MULTICAST) ||
+ (skb->pkt_type == PACKET_BROADCAST))
+ deliver_to_self = true;
+ else if (ether_addr_equal(eth_hdr(skb)->h_dest, hsr->dev->dev_addr)) {
+ skb->pkt_type = PACKET_HOST;
+ deliver_to_self = true;
+ }
+
+
+ rcu_read_lock(); /* node_db */
+ node = hsr_find_node(&hsr->node_db, skb);
+
+ if (is_supervision_frame(hsr, skb)) {
+ skb_pull(skb, sizeof(struct hsr_sup_tag));
+ node = hsr_merge_node(hsr, node, skb, dev_in_idx);
+ if (!node) {
+ rcu_read_unlock(); /* node_db */
+ kfree_skb(skb);
+ hsr->dev->stats.rx_dropped++;
+ return RX_HANDLER_CONSUMED;
+ }
+ skb_push(skb, sizeof(struct hsr_sup_tag));
+ deliver_to_self = false;
+ }
+
+ if (!node) {
+ /* Source node unknown; this might be a HSR frame from
+ * another net (different multicast address). Ignore it.
+ */
+ rcu_read_unlock(); /* node_db */
+ kfree_skb(skb);
+ return RX_HANDLER_CONSUMED;
+ }
+
+ /* Register ALL incoming frames as outgoing through the other interface.
+ * This allows us to register frames as incoming only if they are valid
+ * for the receiving interface, without using a specific counter for
+ * incoming frames.
+ */
+ dup_out = hsr_register_frame_out(node, dev_other_idx, skb);
+ if (!dup_out)
+ hsr_register_frame_in(node, dev_in_idx);
+
+ /* Forward this frame? */
+ if (!dup_out && (skb->pkt_type != PACKET_HOST))
+ other_slave = get_other_slave(hsr, dev);
+ else
+ other_slave = NULL;
+
+ if (hsr_register_frame_out(node, HSR_DEV_MASTER, skb))
+ deliver_to_self = false;
+
+ rcu_read_unlock(); /* node_db */
+
+ if (!deliver_to_self && !other_slave) {
+ kfree_skb(skb);
+ /* Circulated frame; silently remove it. */
+ return RX_HANDLER_CONSUMED;
+ }
+
+ skb_deliver = skb;
+ if (deliver_to_self && other_slave) {
+ /* skb_clone() is not enough since we will strip the hsr tag
+ * and do address substitution below
+ */
+ skb_deliver = pskb_copy(skb, GFP_ATOMIC);
+ if (!skb_deliver) {
+ deliver_to_self = false;
+ hsr->dev->stats.rx_dropped++;
+ }
+ }
+
+ if (deliver_to_self) {
+ bool multicast_frame;
+
+ skb_deliver = hsr_pull_tag(skb_deliver);
+ if (!skb_deliver) {
+ hsr->dev->stats.rx_dropped++;
+ goto forward;
+ }
+#if !defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)
+ /* Move everything in the header that is after the HSR tag,
+ * to work around alignment problems caused by the 6-byte HSR
+ * tag. In practice, this removes/overwrites the HSR tag in
+ * the header and restores a "standard" packet.
+ */
+ memmove(skb_deliver->data - HSR_HLEN, skb_deliver->data,
+ skb_headlen(skb_deliver));
+
+ /* Adjust skb members so they correspond with the move above.
+ * This cannot possibly underflow skb->data since hsr_pull_tag()
+ * above succeeded.
+ * At this point in the protocol stack, the transport and
+ * network headers have not been set yet, and we haven't touched
+ * the mac header nor the head. So we only need to adjust data
+ * and tail:
+ */
+ skb_deliver->data -= HSR_HLEN;
+ skb_deliver->tail -= HSR_HLEN;
+#endif
+ skb_deliver->dev = hsr->dev;
+ hsr_addr_subst_source(hsr, skb_deliver);
+ multicast_frame = (skb_deliver->pkt_type == PACKET_MULTICAST);
+ ret = netif_rx(skb_deliver);
+ if (ret == NET_RX_DROP) {
+ hsr->dev->stats.rx_dropped++;
+ } else {
+ hsr->dev->stats.rx_packets++;
+ hsr->dev->stats.rx_bytes += skb->len;
+ if (multicast_frame)
+ hsr->dev->stats.multicast++;
+ }
+ }
+
+forward:
+ if (other_slave) {
+ skb_push(skb, ETH_HLEN);
+ skb->dev = other_slave;
+ dev_queue_xmit(skb);
+ }
+
+ return RX_HANDLER_CONSUMED;
+}
diff --git a/net/hsr/hsr_slave.h b/net/hsr/hsr_slave.h
new file mode 100644
index 0000000..ae90c8d
--- /dev/null
+++ b/net/hsr/hsr_slave.h
@@ -0,0 +1,20 @@
+/* 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@...en.se
+ */
+
+#ifndef __HSR_SLAVE_H
+#define __HSR_SLAVE_H
+
+#include <linux/skbuff.h>
+#include <linux/netdevice.h>
+
+rx_handler_result_t hsr_handle_frame(struct sk_buff **pskb);
+
+#endif /* __HSR_SLAVE_H */
--
1.8.3.2
--
Arvid Brodin | Consultant (Linux)
ALTEN | Knarrarnäsgatan 7 | SE-164 40 Kista | Sweden
arvid.brodin@...en.se | www.alten.se/en/
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