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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@alten.se> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Arvid Brodin
David S. Miller
parent
70ebe4a471
commit
81ba6afd6e
6 changed files with 283 additions and 247 deletions
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@ -4,4 +4,5 @@
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obj-$(CONFIG_HSR) += hsr.o
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hsr-y := hsr_main.o hsr_framereg.o hsr_device.o hsr_netlink.o
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hsr-y := hsr_main.o hsr_framereg.o hsr_device.o hsr_netlink.o \
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hsr_slave.o
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@ -19,6 +19,7 @@
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#include <linux/rtnetlink.h>
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#include <linux/pkt_sched.h>
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#include "hsr_device.h"
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#include "hsr_slave.h"
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#include "hsr_framereg.h"
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#include "hsr_main.h"
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@ -393,7 +394,6 @@ static void restore_slaves(struct net_device *hsr_dev)
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rtnl_lock();
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/* Restore promiscuity */
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for (i = 0; i < HSR_MAX_SLAVE; i++) {
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if (!hsr->slave[i])
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continue;
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@ -402,8 +402,12 @@ static void restore_slaves(struct net_device *hsr_dev)
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netdev_info(hsr_dev,
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"Cannot restore slave promiscuity (%s, %d)\n",
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hsr->slave[i]->name, res);
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if (hsr->slave[i]->rx_handler == hsr_handle_frame)
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netdev_rx_handler_unregister(hsr->slave[i]);
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}
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rtnl_unlock();
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}
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@ -575,6 +579,13 @@ int hsr_dev_finalize(struct net_device *hsr_dev, struct net_device *slave[2],
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}
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}
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for (i = 0; i < HSR_MAX_SLAVE; i++) {
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res = netdev_rx_handler_register(slave[i], hsr_handle_frame,
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hsr);
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if (res)
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goto fail;
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}
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/* Make sure we recognize frames from ourselves in hsr_rcv() */
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res = hsr_create_self_node(&hsr->self_node_db, hsr_dev->dev_addr,
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hsr->slave[1]->dev_addr);
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@ -7,10 +7,6 @@
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*
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* Author(s):
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* 2011-2014 Arvid Brodin, arvid.brodin@alten.se
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*
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* In addition to routines for registering and unregistering HSR support, this
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* file also contains the receive routine that handles all incoming frames with
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* Ethertype (protocol) ETH_P_PRP (HSRv0), and network device event handling.
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*/
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#include <linux/netdevice.h>
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@ -56,11 +52,10 @@ bool is_hsr_slave(struct net_device *dev)
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return false;
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}
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/* If dev is a HSR slave device, return the virtual master device. Return NULL
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* otherwise.
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*/
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static struct hsr_priv *get_hsr_master(struct net_device *dev)
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struct hsr_priv *get_hsr_master(struct net_device *dev)
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{
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struct hsr_priv *hsr;
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@ -76,11 +71,10 @@ static struct hsr_priv *get_hsr_master(struct net_device *dev)
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return NULL;
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}
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/* If dev is a HSR slave device, return the other slave device. Return NULL
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* otherwise.
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*/
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static struct net_device *get_other_slave(struct hsr_priv *hsr,
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struct net_device *get_other_slave(struct hsr_priv *hsr,
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struct net_device *dev)
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{
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if (dev == hsr->slave[0])
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@ -197,239 +191,6 @@ static void prune_nodes_all(unsigned long data)
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}
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static struct sk_buff *hsr_pull_tag(struct sk_buff *skb)
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{
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struct hsr_tag *hsr_tag;
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struct sk_buff *skb2;
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skb2 = skb_share_check(skb, GFP_ATOMIC);
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if (unlikely(!skb2))
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goto err_free;
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skb = skb2;
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if (unlikely(!pskb_may_pull(skb, HSR_HLEN)))
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goto err_free;
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hsr_tag = (struct hsr_tag *) skb->data;
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skb->protocol = hsr_tag->encap_proto;
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skb_pull(skb, HSR_HLEN);
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return skb;
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err_free:
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kfree_skb(skb);
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return NULL;
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}
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/* The uses I can see for these HSR supervision frames are:
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* 1) Use the frames that are sent after node initialization ("HSR_TLV.Type =
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* 22") to reset any sequence_nr counters belonging to that node. Useful if
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* the other node's counter has been reset for some reason.
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* --
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* Or not - resetting the counter and bridging the frame would create a
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* loop, unfortunately.
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*
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* 2) Use the LifeCheck frames to detect ring breaks. I.e. if no LifeCheck
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* frame is received from a particular node, we know something is wrong.
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* We just register these (as with normal frames) and throw them away.
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*
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* 3) Allow different MAC addresses for the two slave interfaces, using the
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* MacAddressA field.
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*/
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static bool is_supervision_frame(struct hsr_priv *hsr, struct sk_buff *skb)
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{
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struct hsr_sup_tag *hsr_stag;
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if (!ether_addr_equal(eth_hdr(skb)->h_dest,
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hsr->sup_multicast_addr))
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return false;
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hsr_stag = (struct hsr_sup_tag *) skb->data;
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if (get_hsr_stag_path(hsr_stag) != 0x0f)
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return false;
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if ((hsr_stag->HSR_TLV_Type != HSR_TLV_ANNOUNCE) &&
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(hsr_stag->HSR_TLV_Type != HSR_TLV_LIFE_CHECK))
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return false;
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if (hsr_stag->HSR_TLV_Length != 12)
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return false;
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return true;
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}
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/* Implementation somewhat according to IEC-62439-3, p. 43
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*/
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static int hsr_rcv(struct sk_buff *skb, struct net_device *dev,
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struct packet_type *pt, struct net_device *orig_dev)
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{
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struct hsr_priv *hsr;
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struct net_device *other_slave;
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struct hsr_node *node;
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bool deliver_to_self;
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struct sk_buff *skb_deliver;
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enum hsr_dev_idx dev_in_idx, dev_other_idx;
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bool dup_out;
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int ret;
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hsr = get_hsr_master(dev);
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if (!hsr) {
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/* Non-HSR-slave device 'dev' is connected to a HSR network */
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kfree_skb(skb);
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dev->stats.rx_errors++;
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return NET_RX_SUCCESS;
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}
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if (dev == hsr->slave[0]) {
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dev_in_idx = HSR_DEV_SLAVE_A;
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dev_other_idx = HSR_DEV_SLAVE_B;
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} else {
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dev_in_idx = HSR_DEV_SLAVE_B;
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dev_other_idx = HSR_DEV_SLAVE_A;
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}
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node = hsr_find_node(&hsr->self_node_db, skb);
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if (node) {
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/* Always kill frames sent by ourselves */
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kfree_skb(skb);
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return NET_RX_SUCCESS;
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}
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/* Is this frame a candidate for local reception? */
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deliver_to_self = false;
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if ((skb->pkt_type == PACKET_HOST) ||
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(skb->pkt_type == PACKET_MULTICAST) ||
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(skb->pkt_type == PACKET_BROADCAST))
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deliver_to_self = true;
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else if (ether_addr_equal(eth_hdr(skb)->h_dest,
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hsr->dev->dev_addr)) {
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skb->pkt_type = PACKET_HOST;
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deliver_to_self = true;
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}
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rcu_read_lock(); /* node_db */
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node = hsr_find_node(&hsr->node_db, skb);
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if (is_supervision_frame(hsr, skb)) {
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skb_pull(skb, sizeof(struct hsr_sup_tag));
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node = hsr_merge_node(hsr, node, skb, dev_in_idx);
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if (!node) {
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rcu_read_unlock(); /* node_db */
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kfree_skb(skb);
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hsr->dev->stats.rx_dropped++;
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return NET_RX_DROP;
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}
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skb_push(skb, sizeof(struct hsr_sup_tag));
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deliver_to_self = false;
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}
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if (!node) {
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/* Source node unknown; this might be a HSR frame from
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* another net (different multicast address). Ignore it.
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*/
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rcu_read_unlock(); /* node_db */
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kfree_skb(skb);
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return NET_RX_SUCCESS;
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}
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/* Register ALL incoming frames as outgoing through the other interface.
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* This allows us to register frames as incoming only if they are valid
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* for the receiving interface, without using a specific counter for
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* incoming frames.
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*/
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dup_out = hsr_register_frame_out(node, dev_other_idx, skb);
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if (!dup_out)
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hsr_register_frame_in(node, dev_in_idx);
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/* Forward this frame? */
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if (!dup_out && (skb->pkt_type != PACKET_HOST))
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other_slave = get_other_slave(hsr, dev);
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else
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other_slave = NULL;
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if (hsr_register_frame_out(node, HSR_DEV_MASTER, skb))
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deliver_to_self = false;
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rcu_read_unlock(); /* node_db */
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if (!deliver_to_self && !other_slave) {
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kfree_skb(skb);
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/* Circulated frame; silently remove it. */
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return NET_RX_SUCCESS;
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}
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skb_deliver = skb;
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if (deliver_to_self && other_slave) {
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/* skb_clone() is not enough since we will strip the hsr tag
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* and do address substitution below
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*/
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skb_deliver = pskb_copy(skb, GFP_ATOMIC);
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if (!skb_deliver) {
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deliver_to_self = false;
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hsr->dev->stats.rx_dropped++;
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}
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}
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if (deliver_to_self) {
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bool multicast_frame;
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skb_deliver = hsr_pull_tag(skb_deliver);
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if (!skb_deliver) {
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hsr->dev->stats.rx_dropped++;
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goto forward;
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}
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#if !defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)
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/* Move everything in the header that is after the HSR tag,
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* to work around alignment problems caused by the 6-byte HSR
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* tag. In practice, this removes/overwrites the HSR tag in
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* the header and restores a "standard" packet.
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*/
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memmove(skb_deliver->data - HSR_HLEN, skb_deliver->data,
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skb_headlen(skb_deliver));
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/* Adjust skb members so they correspond with the move above.
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* This cannot possibly underflow skb->data since hsr_pull_tag()
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* above succeeded.
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* At this point in the protocol stack, the transport and
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* network headers have not been set yet, and we haven't touched
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* the mac header nor the head. So we only need to adjust data
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* and tail:
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*/
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skb_deliver->data -= HSR_HLEN;
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skb_deliver->tail -= HSR_HLEN;
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#endif
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skb_deliver->dev = hsr->dev;
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hsr_addr_subst_source(hsr, skb_deliver);
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multicast_frame = (skb_deliver->pkt_type == PACKET_MULTICAST);
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ret = netif_rx(skb_deliver);
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if (ret == NET_RX_DROP) {
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hsr->dev->stats.rx_dropped++;
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} else {
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hsr->dev->stats.rx_packets++;
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hsr->dev->stats.rx_bytes += skb->len;
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if (multicast_frame)
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hsr->dev->stats.multicast++;
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}
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}
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forward:
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if (other_slave) {
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skb_push(skb, ETH_HLEN);
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skb->dev = other_slave;
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dev_queue_xmit(skb);
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}
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return NET_RX_SUCCESS;
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}
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static struct packet_type hsr_pt __read_mostly = {
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.type = htons(ETH_P_PRP),
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.func = hsr_rcv,
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};
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static struct notifier_block hsr_nb = {
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.notifier_call = hsr_netdev_notify, /* Slave event notifications */
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};
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@ -441,8 +202,6 @@ static int __init hsr_init(void)
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BUILD_BUG_ON(sizeof(struct hsr_tag) != HSR_HLEN);
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dev_add_pack(&hsr_pt);
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init_timer(&prune_timer);
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prune_timer.function = prune_nodes_all;
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prune_timer.data = 0;
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@ -461,7 +220,6 @@ static void __exit hsr_exit(void)
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unregister_netdevice_notifier(&hsr_nb);
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del_timer_sync(&prune_timer);
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hsr_netlink_exit();
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dev_remove_pack(&hsr_pt);
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}
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module_init(hsr_init);
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@ -162,5 +162,8 @@ struct hsr_priv {
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void register_hsr_master(struct hsr_priv *hsr);
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void unregister_hsr_master(struct hsr_priv *hsr);
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bool is_hsr_slave(struct net_device *dev);
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struct hsr_priv *get_hsr_master(struct net_device *dev);
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struct net_device *get_other_slave(struct hsr_priv *hsr,
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struct net_device *dev);
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#endif /* __HSR_PRIVATE_H */
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243
net/hsr/hsr_slave.c
Normal file
243
net/hsr/hsr_slave.c
Normal file
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@ -0,0 +1,243 @@
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/* Copyright 2011-2014 Autronica Fire and Security AS
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*
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* This program is free software; you can redistribute it and/or modify it
|
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* under the terms of the GNU General Public License as published by the Free
|
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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* Author(s):
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* 2011-2014 Arvid Brodin, arvid.brodin@alten.se
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*/
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#include "hsr_slave.h"
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#include <linux/etherdevice.h>
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#include "hsr_main.h"
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#include "hsr_framereg.h"
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static struct sk_buff *hsr_pull_tag(struct sk_buff *skb)
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{
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struct hsr_tag *hsr_tag;
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struct sk_buff *skb2;
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skb2 = skb_share_check(skb, GFP_ATOMIC);
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if (unlikely(!skb2))
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goto err_free;
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skb = skb2;
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if (unlikely(!pskb_may_pull(skb, HSR_HLEN)))
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goto err_free;
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hsr_tag = (struct hsr_tag *) skb->data;
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skb->protocol = hsr_tag->encap_proto;
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skb_pull(skb, HSR_HLEN);
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return skb;
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err_free:
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kfree_skb(skb);
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return NULL;
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}
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|
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|
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/* The uses I can see for these HSR supervision frames are:
|
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* 1) Use the frames that are sent after node initialization ("HSR_TLV.Type =
|
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* 22") to reset any sequence_nr counters belonging to that node. Useful if
|
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* the other node's counter has been reset for some reason.
|
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* --
|
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* Or not - resetting the counter and bridging the frame would create a
|
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* loop, unfortunately.
|
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*
|
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* 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.
|
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*
|
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* 3) Allow different MAC addresses for the two slave interfaces, using the
|
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* MacAddressA field.
|
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*/
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static bool is_supervision_frame(struct hsr_priv *hsr, struct sk_buff *skb)
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{
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struct hsr_sup_tag *hsr_stag;
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if (!ether_addr_equal(eth_hdr(skb)->h_dest,
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hsr->sup_multicast_addr))
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return false;
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hsr_stag = (struct hsr_sup_tag *) skb->data;
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if (get_hsr_stag_path(hsr_stag) != 0x0f)
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return false;
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if ((hsr_stag->HSR_TLV_Type != HSR_TLV_ANNOUNCE) &&
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(hsr_stag->HSR_TLV_Type != HSR_TLV_LIFE_CHECK))
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return false;
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if (hsr_stag->HSR_TLV_Length != 12)
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return false;
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return true;
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}
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|
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/* Implementation somewhat according to IEC-62439-3, p. 43
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*/
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rx_handler_result_t hsr_handle_frame(struct sk_buff **pskb)
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{
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struct sk_buff *skb = *pskb;
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struct net_device *dev = skb->dev;
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struct hsr_priv *hsr;
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struct net_device *other_slave;
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struct hsr_node *node;
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bool deliver_to_self;
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struct sk_buff *skb_deliver;
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enum hsr_dev_idx dev_in_idx, dev_other_idx;
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bool dup_out;
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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;
|
||||
}
|
||||
20
net/hsr/hsr_slave.h
Normal file
20
net/hsr/hsr_slave.h
Normal file
|
|
@ -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@alten.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 */
|
||||
Loading…
Reference in a new issue