597 строки
15 KiB
C
597 строки
15 KiB
C
/* Copyright 2011-2013 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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* 2011-2013 Arvid Brodin, arvid.brodin@xdin.com
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*
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* This file contains device methods for creating, using and destroying
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* virtual HSR devices.
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*/
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#include <linux/netdevice.h>
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#include <linux/skbuff.h>
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#include <linux/etherdevice.h>
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#include <linux/if_arp.h>
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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_framereg.h"
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#include "hsr_main.h"
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static bool is_admin_up(struct net_device *dev)
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{
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return dev && (dev->flags & IFF_UP);
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}
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static bool is_slave_up(struct net_device *dev)
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{
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return dev && is_admin_up(dev) && netif_oper_up(dev);
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}
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static void __hsr_set_operstate(struct net_device *dev, int transition)
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{
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write_lock_bh(&dev_base_lock);
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if (dev->operstate != transition) {
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dev->operstate = transition;
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write_unlock_bh(&dev_base_lock);
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netdev_state_change(dev);
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} else {
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write_unlock_bh(&dev_base_lock);
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}
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}
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void hsr_set_operstate(struct net_device *hsr_dev, struct net_device *slave1,
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struct net_device *slave2)
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{
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if (!is_admin_up(hsr_dev)) {
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__hsr_set_operstate(hsr_dev, IF_OPER_DOWN);
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return;
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}
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if (is_slave_up(slave1) || is_slave_up(slave2))
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__hsr_set_operstate(hsr_dev, IF_OPER_UP);
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else
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__hsr_set_operstate(hsr_dev, IF_OPER_LOWERLAYERDOWN);
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}
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void hsr_set_carrier(struct net_device *hsr_dev, struct net_device *slave1,
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struct net_device *slave2)
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{
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if (is_slave_up(slave1) || is_slave_up(slave2))
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netif_carrier_on(hsr_dev);
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else
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netif_carrier_off(hsr_dev);
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}
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void hsr_check_announce(struct net_device *hsr_dev, int old_operstate)
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{
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struct hsr_priv *hsr_priv;
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hsr_priv = netdev_priv(hsr_dev);
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if ((hsr_dev->operstate == IF_OPER_UP) && (old_operstate != IF_OPER_UP)) {
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/* Went up */
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hsr_priv->announce_count = 0;
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hsr_priv->announce_timer.expires = jiffies +
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msecs_to_jiffies(HSR_ANNOUNCE_INTERVAL);
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add_timer(&hsr_priv->announce_timer);
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}
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if ((hsr_dev->operstate != IF_OPER_UP) && (old_operstate == IF_OPER_UP))
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/* Went down */
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del_timer(&hsr_priv->announce_timer);
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}
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int hsr_get_max_mtu(struct hsr_priv *hsr_priv)
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{
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int mtu_max;
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if (hsr_priv->slave[0] && hsr_priv->slave[1])
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mtu_max = min(hsr_priv->slave[0]->mtu, hsr_priv->slave[1]->mtu);
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else if (hsr_priv->slave[0])
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mtu_max = hsr_priv->slave[0]->mtu;
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else if (hsr_priv->slave[1])
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mtu_max = hsr_priv->slave[1]->mtu;
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else
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mtu_max = HSR_TAGLEN;
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return mtu_max - HSR_TAGLEN;
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}
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static int hsr_dev_change_mtu(struct net_device *dev, int new_mtu)
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{
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struct hsr_priv *hsr_priv;
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hsr_priv = netdev_priv(dev);
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if (new_mtu > hsr_get_max_mtu(hsr_priv)) {
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netdev_info(hsr_priv->dev, "A HSR master's MTU cannot be greater than the smallest MTU of its slaves minus the HSR Tag length (%d octets).\n",
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HSR_TAGLEN);
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return -EINVAL;
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}
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dev->mtu = new_mtu;
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return 0;
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}
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static int hsr_dev_open(struct net_device *dev)
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{
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struct hsr_priv *hsr_priv;
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int i;
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char *slave_name;
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hsr_priv = netdev_priv(dev);
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for (i = 0; i < HSR_MAX_SLAVE; i++) {
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if (hsr_priv->slave[i])
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slave_name = hsr_priv->slave[i]->name;
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else
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slave_name = "null";
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if (!is_slave_up(hsr_priv->slave[i]))
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netdev_warn(dev, "Slave %c (%s) is not up; please bring it up to get a working HSR network\n",
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'A' + i, slave_name);
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}
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return 0;
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}
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static int hsr_dev_close(struct net_device *dev)
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{
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/* Nothing to do here. We could try to restore the state of the slaves
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* to what they were before being changed by the hsr master dev's state,
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* but they might have been changed manually in the mean time too, so
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* taking them up or down here might be confusing and is probably not a
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* good idea.
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*/
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return 0;
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}
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static void hsr_fill_tag(struct hsr_ethhdr *hsr_ethhdr, struct hsr_priv *hsr_priv)
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{
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unsigned long irqflags;
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/* IEC 62439-1:2010, p 48, says the 4-bit "path" field can take values
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* between 0001-1001 ("ring identifier", for regular HSR frames),
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* or 1111 ("HSR management", supervision frames). Unfortunately, the
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* spec writers forgot to explain what a "ring identifier" is, or
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* how it is used. So we just set this to 0001 for regular frames,
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* and 1111 for supervision frames.
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*/
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set_hsr_tag_path(&hsr_ethhdr->hsr_tag, 0x1);
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/* IEC 62439-1:2010, p 12: "The link service data unit in an Ethernet
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* frame is the content of the frame located between the Length/Type
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* field and the Frame Check Sequence."
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*
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* IEC 62439-3, p 48, specifies the "original LPDU" to include the
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* original "LT" field (what "LT" means is not explained anywhere as
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* far as I can see - perhaps "Length/Type"?). So LSDU_size might
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* equal original length + 2.
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* Also, the fact that this field is not used anywhere (might be used
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* by a RedBox connecting HSR and PRP nets?) means I cannot test its
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* correctness. Instead of guessing, I set this to 0 here, to make any
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* problems immediately apparent. Anyone using this driver with PRP/HSR
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* RedBoxes might need to fix this...
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*/
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set_hsr_tag_LSDU_size(&hsr_ethhdr->hsr_tag, 0);
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spin_lock_irqsave(&hsr_priv->seqnr_lock, irqflags);
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hsr_ethhdr->hsr_tag.sequence_nr = htons(hsr_priv->sequence_nr);
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hsr_priv->sequence_nr++;
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spin_unlock_irqrestore(&hsr_priv->seqnr_lock, irqflags);
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hsr_ethhdr->hsr_tag.encap_proto = hsr_ethhdr->ethhdr.h_proto;
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hsr_ethhdr->ethhdr.h_proto = htons(ETH_P_PRP);
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}
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static int slave_xmit(struct sk_buff *skb, struct hsr_priv *hsr_priv,
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enum hsr_dev_idx dev_idx)
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{
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struct hsr_ethhdr *hsr_ethhdr;
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hsr_ethhdr = (struct hsr_ethhdr *) skb->data;
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skb->dev = hsr_priv->slave[dev_idx];
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hsr_addr_subst_dest(hsr_priv, &hsr_ethhdr->ethhdr, dev_idx);
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/* Address substitution (IEC62439-3 pp 26, 50): replace mac
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* address of outgoing frame with that of the outgoing slave's.
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*/
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memcpy(hsr_ethhdr->ethhdr.h_source, skb->dev->dev_addr, ETH_ALEN);
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return dev_queue_xmit(skb);
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}
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static int hsr_dev_xmit(struct sk_buff *skb, struct net_device *dev)
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{
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struct hsr_priv *hsr_priv;
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struct hsr_ethhdr *hsr_ethhdr;
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struct sk_buff *skb2;
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int res1, res2;
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hsr_priv = netdev_priv(dev);
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hsr_ethhdr = (struct hsr_ethhdr *) skb->data;
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if ((skb->protocol != htons(ETH_P_PRP)) ||
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(hsr_ethhdr->ethhdr.h_proto != htons(ETH_P_PRP))) {
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hsr_fill_tag(hsr_ethhdr, hsr_priv);
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skb->protocol = htons(ETH_P_PRP);
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}
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skb2 = pskb_copy(skb, GFP_ATOMIC);
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res1 = NET_XMIT_DROP;
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if (likely(hsr_priv->slave[HSR_DEV_SLAVE_A]))
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res1 = slave_xmit(skb, hsr_priv, HSR_DEV_SLAVE_A);
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res2 = NET_XMIT_DROP;
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if (likely(skb2 && hsr_priv->slave[HSR_DEV_SLAVE_B]))
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res2 = slave_xmit(skb2, hsr_priv, HSR_DEV_SLAVE_B);
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if (likely(res1 == NET_XMIT_SUCCESS || res1 == NET_XMIT_CN ||
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res2 == NET_XMIT_SUCCESS || res2 == NET_XMIT_CN)) {
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hsr_priv->dev->stats.tx_packets++;
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hsr_priv->dev->stats.tx_bytes += skb->len;
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} else {
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hsr_priv->dev->stats.tx_dropped++;
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}
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return NETDEV_TX_OK;
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}
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static int hsr_header_create(struct sk_buff *skb, struct net_device *dev,
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unsigned short type, const void *daddr,
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const void *saddr, unsigned int len)
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{
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int res;
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/* Make room for the HSR tag now. We will fill it in later (in
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* hsr_dev_xmit)
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*/
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if (skb_headroom(skb) < HSR_TAGLEN + ETH_HLEN)
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return -ENOBUFS;
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skb_push(skb, HSR_TAGLEN);
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/* To allow VLAN/HSR combos we should probably use
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* res = dev_hard_header(skb, dev, type, daddr, saddr, len + HSR_TAGLEN);
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* here instead. It would require other changes too, though - e.g.
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* separate headers for each slave etc...
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*/
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res = eth_header(skb, dev, type, daddr, saddr, len + HSR_TAGLEN);
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if (res <= 0)
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return res;
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skb_reset_mac_header(skb);
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return res + HSR_TAGLEN;
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}
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static const struct header_ops hsr_header_ops = {
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.create = hsr_header_create,
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.parse = eth_header_parse,
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};
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/* HSR:2010 supervision frames should be padded so that the whole frame,
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* including headers and FCS, is 64 bytes (without VLAN).
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*/
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static int hsr_pad(int size)
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{
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const int min_size = ETH_ZLEN - HSR_TAGLEN - ETH_HLEN;
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if (size >= min_size)
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return size;
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return min_size;
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}
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static void send_hsr_supervision_frame(struct net_device *hsr_dev, u8 type)
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{
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struct hsr_priv *hsr_priv;
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struct sk_buff *skb;
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int hlen, tlen;
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struct hsr_sup_tag *hsr_stag;
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struct hsr_sup_payload *hsr_sp;
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unsigned long irqflags;
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hlen = LL_RESERVED_SPACE(hsr_dev);
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tlen = hsr_dev->needed_tailroom;
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skb = alloc_skb(hsr_pad(sizeof(struct hsr_sup_payload)) + hlen + tlen,
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GFP_ATOMIC);
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if (skb == NULL)
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return;
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hsr_priv = netdev_priv(hsr_dev);
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skb_reserve(skb, hlen);
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skb->dev = hsr_dev;
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skb->protocol = htons(ETH_P_PRP);
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skb->priority = TC_PRIO_CONTROL;
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if (dev_hard_header(skb, skb->dev, ETH_P_PRP,
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hsr_priv->sup_multicast_addr,
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skb->dev->dev_addr, skb->len) < 0)
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goto out;
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skb_pull(skb, sizeof(struct ethhdr));
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hsr_stag = (typeof(hsr_stag)) skb->data;
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set_hsr_stag_path(hsr_stag, 0xf);
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set_hsr_stag_HSR_Ver(hsr_stag, 0);
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spin_lock_irqsave(&hsr_priv->seqnr_lock, irqflags);
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hsr_stag->sequence_nr = htons(hsr_priv->sequence_nr);
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hsr_priv->sequence_nr++;
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spin_unlock_irqrestore(&hsr_priv->seqnr_lock, irqflags);
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hsr_stag->HSR_TLV_Type = type;
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hsr_stag->HSR_TLV_Length = 12;
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skb_push(skb, sizeof(struct ethhdr));
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/* Payload: MacAddressA */
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hsr_sp = (typeof(hsr_sp)) skb_put(skb, sizeof(*hsr_sp));
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memcpy(hsr_sp->MacAddressA, hsr_dev->dev_addr, ETH_ALEN);
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dev_queue_xmit(skb);
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return;
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out:
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kfree_skb(skb);
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}
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/* Announce (supervision frame) timer function
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*/
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static void hsr_announce(unsigned long data)
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{
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struct hsr_priv *hsr_priv;
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hsr_priv = (struct hsr_priv *) data;
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if (hsr_priv->announce_count < 3) {
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send_hsr_supervision_frame(hsr_priv->dev, HSR_TLV_ANNOUNCE);
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hsr_priv->announce_count++;
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} else {
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send_hsr_supervision_frame(hsr_priv->dev, HSR_TLV_LIFE_CHECK);
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}
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if (hsr_priv->announce_count < 3)
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hsr_priv->announce_timer.expires = jiffies +
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msecs_to_jiffies(HSR_ANNOUNCE_INTERVAL);
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else
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hsr_priv->announce_timer.expires = jiffies +
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msecs_to_jiffies(HSR_LIFE_CHECK_INTERVAL);
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if (is_admin_up(hsr_priv->dev))
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add_timer(&hsr_priv->announce_timer);
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}
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static void restore_slaves(struct net_device *hsr_dev)
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{
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struct hsr_priv *hsr_priv;
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int i;
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int res;
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hsr_priv = netdev_priv(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_priv->slave[i])
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continue;
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res = dev_set_promiscuity(hsr_priv->slave[i], -1);
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if (res)
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netdev_info(hsr_dev,
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"Cannot restore slave promiscuity (%s, %d)\n",
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hsr_priv->slave[i]->name, res);
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}
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rtnl_unlock();
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}
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static void reclaim_hsr_dev(struct rcu_head *rh)
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{
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struct hsr_priv *hsr_priv;
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hsr_priv = container_of(rh, struct hsr_priv, rcu_head);
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free_netdev(hsr_priv->dev);
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}
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/* According to comments in the declaration of struct net_device, this function
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* is "Called from unregister, can be used to call free_netdev". Ok then...
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*/
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static void hsr_dev_destroy(struct net_device *hsr_dev)
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{
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struct hsr_priv *hsr_priv;
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hsr_priv = netdev_priv(hsr_dev);
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del_timer(&hsr_priv->announce_timer);
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unregister_hsr_master(hsr_priv); /* calls list_del_rcu on hsr_priv */
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restore_slaves(hsr_dev);
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call_rcu(&hsr_priv->rcu_head, reclaim_hsr_dev); /* reclaim hsr_priv */
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}
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static const struct net_device_ops hsr_device_ops = {
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.ndo_change_mtu = hsr_dev_change_mtu,
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.ndo_open = hsr_dev_open,
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.ndo_stop = hsr_dev_close,
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.ndo_start_xmit = hsr_dev_xmit,
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};
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void hsr_dev_setup(struct net_device *dev)
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{
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random_ether_addr(dev->dev_addr);
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ether_setup(dev);
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dev->header_ops = &hsr_header_ops;
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dev->netdev_ops = &hsr_device_ops;
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dev->tx_queue_len = 0;
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dev->destructor = hsr_dev_destroy;
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}
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/* Return true if dev is a HSR master; return false otherwise.
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*/
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bool is_hsr_master(struct net_device *dev)
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{
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return (dev->netdev_ops->ndo_start_xmit == hsr_dev_xmit);
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}
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static int check_slave_ok(struct net_device *dev)
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{
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/* Don't allow HSR on non-ethernet like devices */
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if ((dev->flags & IFF_LOOPBACK) || (dev->type != ARPHRD_ETHER) ||
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(dev->addr_len != ETH_ALEN)) {
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netdev_info(dev, "Cannot use loopback or non-ethernet device as HSR slave.\n");
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return -EINVAL;
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}
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/* Don't allow enslaving hsr devices */
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if (is_hsr_master(dev)) {
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netdev_info(dev, "Cannot create trees of HSR devices.\n");
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return -EINVAL;
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}
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if (is_hsr_slave(dev)) {
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netdev_info(dev, "This device is already a HSR slave.\n");
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return -EINVAL;
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}
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if (dev->priv_flags & IFF_802_1Q_VLAN) {
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netdev_info(dev, "HSR on top of VLAN is not yet supported in this driver.\n");
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return -EINVAL;
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}
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/* HSR over bonded devices has not been tested, but I'm not sure it
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* won't work...
|
|
*/
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
/* Default multicast address for HSR Supervision frames */
|
|
static const unsigned char def_multicast_addr[ETH_ALEN] = {
|
|
0x01, 0x15, 0x4e, 0x00, 0x01, 0x00
|
|
};
|
|
|
|
int hsr_dev_finalize(struct net_device *hsr_dev, struct net_device *slave[2],
|
|
unsigned char multicast_spec)
|
|
{
|
|
struct hsr_priv *hsr_priv;
|
|
int i;
|
|
int res;
|
|
|
|
hsr_priv = netdev_priv(hsr_dev);
|
|
hsr_priv->dev = hsr_dev;
|
|
INIT_LIST_HEAD(&hsr_priv->node_db);
|
|
INIT_LIST_HEAD(&hsr_priv->self_node_db);
|
|
for (i = 0; i < HSR_MAX_SLAVE; i++)
|
|
hsr_priv->slave[i] = slave[i];
|
|
|
|
spin_lock_init(&hsr_priv->seqnr_lock);
|
|
/* Overflow soon to find bugs easier: */
|
|
hsr_priv->sequence_nr = USHRT_MAX - 1024;
|
|
|
|
init_timer(&hsr_priv->announce_timer);
|
|
hsr_priv->announce_timer.function = hsr_announce;
|
|
hsr_priv->announce_timer.data = (unsigned long) hsr_priv;
|
|
|
|
memcpy(hsr_priv->sup_multicast_addr, def_multicast_addr, ETH_ALEN);
|
|
hsr_priv->sup_multicast_addr[ETH_ALEN - 1] = multicast_spec;
|
|
|
|
/* FIXME: should I modify the value of these?
|
|
*
|
|
* - hsr_dev->flags - i.e.
|
|
* IFF_MASTER/SLAVE?
|
|
* - hsr_dev->priv_flags - i.e.
|
|
* IFF_EBRIDGE?
|
|
* IFF_TX_SKB_SHARING?
|
|
* IFF_HSR_MASTER/SLAVE?
|
|
*/
|
|
|
|
for (i = 0; i < HSR_MAX_SLAVE; i++) {
|
|
res = check_slave_ok(slave[i]);
|
|
if (res)
|
|
return res;
|
|
}
|
|
|
|
hsr_dev->features = slave[0]->features & slave[1]->features;
|
|
/* Prevent recursive tx locking */
|
|
hsr_dev->features |= NETIF_F_LLTX;
|
|
/* VLAN on top of HSR needs testing and probably some work on
|
|
* hsr_header_create() etc.
|
|
*/
|
|
hsr_dev->features |= NETIF_F_VLAN_CHALLENGED;
|
|
|
|
/* Set hsr_dev's MAC address to that of mac_slave1 */
|
|
memcpy(hsr_dev->dev_addr, hsr_priv->slave[0]->dev_addr, ETH_ALEN);
|
|
|
|
/* Set required header length */
|
|
for (i = 0; i < HSR_MAX_SLAVE; i++) {
|
|
if (slave[i]->hard_header_len + HSR_TAGLEN >
|
|
hsr_dev->hard_header_len)
|
|
hsr_dev->hard_header_len =
|
|
slave[i]->hard_header_len + HSR_TAGLEN;
|
|
}
|
|
|
|
/* MTU */
|
|
for (i = 0; i < HSR_MAX_SLAVE; i++)
|
|
if (slave[i]->mtu - HSR_TAGLEN < hsr_dev->mtu)
|
|
hsr_dev->mtu = slave[i]->mtu - HSR_TAGLEN;
|
|
|
|
/* Make sure the 1st call to netif_carrier_on() gets through */
|
|
netif_carrier_off(hsr_dev);
|
|
|
|
/* Promiscuity */
|
|
for (i = 0; i < HSR_MAX_SLAVE; i++) {
|
|
res = dev_set_promiscuity(slave[i], 1);
|
|
if (res) {
|
|
netdev_info(hsr_dev, "Cannot set slave promiscuity (%s, %d)\n",
|
|
slave[i]->name, res);
|
|
goto fail;
|
|
}
|
|
}
|
|
|
|
/* Make sure we recognize frames from ourselves in hsr_rcv() */
|
|
res = hsr_create_self_node(&hsr_priv->self_node_db,
|
|
hsr_dev->dev_addr,
|
|
hsr_priv->slave[1]->dev_addr);
|
|
if (res < 0)
|
|
goto fail;
|
|
|
|
res = register_netdevice(hsr_dev);
|
|
if (res)
|
|
goto fail;
|
|
|
|
register_hsr_master(hsr_priv);
|
|
|
|
return 0;
|
|
|
|
fail:
|
|
restore_slaves(hsr_dev);
|
|
return res;
|
|
}
|