net/bonding: Optionally allow ethernet slaves to keep own MAC
Update the "don't change MAC of slaves" functionality added in previous changes to be a generic option, rather than something tied to IB devices, as it's occasionally useful for regular ethernet devices as well. Adds "fail_over_mac" option (which is automatically enabled for IB slaves), applicable only to active-backup mode. Includes documentation update. Updates bonding driver version to 3.2.0. Signed-off-by: Jay Vosburgh <fubar@us.ibm.com> Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Jay Vosburgh
Jeff Garzik
parent
d90a162a4e
commit
dd957c57c5
4 changed files with 121 additions and 24 deletions
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@ -281,6 +281,39 @@ downdelay
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will be rounded down to the nearest multiple. The default
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value is 0.
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fail_over_mac
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Specifies whether active-backup mode should set all slaves to
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the same MAC address (the traditional behavior), or, when
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enabled, change the bond's MAC address when changing the
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active interface (i.e., fail over the MAC address itself).
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Fail over MAC is useful for devices that cannot ever alter
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their MAC address, or for devices that refuse incoming
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broadcasts with their own source MAC (which interferes with
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the ARP monitor).
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The down side of fail over MAC is that every device on the
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network must be updated via gratuitous ARP, vs. just updating
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a switch or set of switches (which often takes place for any
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traffic, not just ARP traffic, if the switch snoops incoming
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traffic to update its tables) for the traditional method. If
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the gratuitous ARP is lost, communication may be disrupted.
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When fail over MAC is used in conjuction with the mii monitor,
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devices which assert link up prior to being able to actually
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transmit and receive are particularly susecptible to loss of
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the gratuitous ARP, and an appropriate updelay setting may be
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required.
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A value of 0 disables fail over MAC, and is the default. A
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value of 1 enables fail over MAC. This option is enabled
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automatically if the first slave added cannot change its MAC
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address. This option may be modified via sysfs only when no
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slaves are present in the bond.
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This option was added in bonding version 3.2.0.
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lacp_rate
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Option specifying the rate in which we'll ask our link partner
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@ -98,6 +98,7 @@ static char *xmit_hash_policy = NULL;
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static int arp_interval = BOND_LINK_ARP_INTERV;
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static char *arp_ip_target[BOND_MAX_ARP_TARGETS] = { NULL, };
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static char *arp_validate = NULL;
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static int fail_over_mac = 0;
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struct bond_params bonding_defaults;
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module_param(max_bonds, int, 0);
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@ -131,6 +132,8 @@ module_param_array(arp_ip_target, charp, NULL, 0);
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MODULE_PARM_DESC(arp_ip_target, "arp targets in n.n.n.n form");
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module_param(arp_validate, charp, 0);
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MODULE_PARM_DESC(arp_validate, "validate src/dst of ARP probes: none (default), active, backup or all");
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module_param(fail_over_mac, int, 0);
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MODULE_PARM_DESC(fail_over_mac, "For active-backup, do not set all slaves to the same MAC. 0 of off (default), 1 for on.");
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/*----------------------------- Global variables ----------------------------*/
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@ -1100,7 +1103,7 @@ void bond_change_active_slave(struct bonding *bond, struct slave *new_active)
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/* when bonding does not set the slave MAC address, the bond MAC
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* address is the one of the active slave.
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*/
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if (new_active && !bond->do_set_mac_addr)
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if (new_active && bond->params.fail_over_mac)
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memcpy(bond->dev->dev_addr, new_active->dev->dev_addr,
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new_active->dev->addr_len);
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if (bond->curr_active_slave &&
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@ -1367,16 +1370,16 @@ int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
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if (slave_dev->set_mac_address == NULL) {
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if (bond->slave_cnt == 0) {
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printk(KERN_WARNING DRV_NAME
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": %s: Warning: The first slave device you "
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"specified does not support setting the MAC "
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"address. This bond MAC address would be that "
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"of the active slave.\n", bond_dev->name);
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bond->do_set_mac_addr = 0;
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} else if (bond->do_set_mac_addr) {
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": %s: Warning: The first slave device "
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"specified does not support setting the MAC "
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"address. Enabling the fail_over_mac option.",
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bond_dev->name);
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bond->params.fail_over_mac = 1;
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} else if (!bond->params.fail_over_mac) {
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printk(KERN_ERR DRV_NAME
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": %s: Error: The slave device you specified "
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"does not support setting the MAC addres,."
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"but this bond uses this practice. \n"
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": %s: Error: The slave device specified "
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"does not support setting the MAC address, "
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"but fail_over_mac is not enabled.\n"
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, bond_dev->name);
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res = -EOPNOTSUPP;
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goto err_undo_flags;
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@ -1401,7 +1404,7 @@ int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
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*/
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memcpy(new_slave->perm_hwaddr, slave_dev->dev_addr, ETH_ALEN);
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if (bond->do_set_mac_addr) {
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if (!bond->params.fail_over_mac) {
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/*
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* Set slave to master's mac address. The application already
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* set the master's mac address to that of the first slave
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@ -1637,7 +1640,7 @@ err_close:
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dev_close(slave_dev);
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err_restore_mac:
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if (bond->do_set_mac_addr) {
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if (!bond->params.fail_over_mac) {
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memcpy(addr.sa_data, new_slave->perm_hwaddr, ETH_ALEN);
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addr.sa_family = slave_dev->type;
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dev_set_mac_address(slave_dev, &addr);
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@ -1814,7 +1817,7 @@ int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
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/* close slave before restoring its mac address */
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dev_close(slave_dev);
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if (bond->do_set_mac_addr) {
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if (!bond->params.fail_over_mac) {
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/* restore original ("permanent") mac address */
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memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN);
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addr.sa_family = slave_dev->type;
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@ -1935,7 +1938,7 @@ static int bond_release_all(struct net_device *bond_dev)
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/* close slave before restoring its mac address */
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dev_close(slave_dev);
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if (bond->do_set_mac_addr) {
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if (!bond->params.fail_over_mac) {
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/* restore original ("permanent") mac address*/
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memcpy(addr.sa_data, slave->perm_hwaddr, ETH_ALEN);
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addr.sa_family = slave_dev->type;
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@ -3060,9 +3063,15 @@ static void bond_info_show_master(struct seq_file *seq)
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curr = bond->curr_active_slave;
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read_unlock(&bond->curr_slave_lock);
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seq_printf(seq, "Bonding Mode: %s\n",
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seq_printf(seq, "Bonding Mode: %s",
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bond_mode_name(bond->params.mode));
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if (bond->params.mode == BOND_MODE_ACTIVEBACKUP &&
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bond->params.fail_over_mac)
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seq_printf(seq, " (fail_over_mac)");
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seq_printf(seq, "\n");
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if (bond->params.mode == BOND_MODE_XOR ||
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bond->params.mode == BOND_MODE_8023AD) {
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seq_printf(seq, "Transmit Hash Policy: %s (%d)\n",
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@ -3994,8 +4003,12 @@ static int bond_set_mac_address(struct net_device *bond_dev, void *addr)
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dprintk("bond=%p, name=%s\n", bond, (bond_dev ? bond_dev->name : "None"));
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if (!bond->do_set_mac_addr)
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return -EOPNOTSUPP;
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/*
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* If fail_over_mac is enabled, do nothing and return success.
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* Returning an error causes ifenslave to fail.
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*/
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if (bond->params.fail_over_mac)
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return 0;
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if (!is_valid_ether_addr(sa->sa_data)) {
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return -EADDRNOTAVAIL;
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@ -4384,10 +4397,6 @@ static int bond_init(struct net_device *bond_dev, struct bond_params *params)
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#ifdef CONFIG_PROC_FS
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bond_create_proc_entry(bond);
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#endif
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/* set do_set_mac_addr to true on startup */
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bond->do_set_mac_addr = 1;
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list_add_tail(&bond->bond_list, &bond_dev_list);
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return 0;
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@ -4721,6 +4730,11 @@ static int bond_check_params(struct bond_params *params)
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primary = NULL;
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}
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if (fail_over_mac && (bond_mode != BOND_MODE_ACTIVEBACKUP))
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printk(KERN_WARNING DRV_NAME
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": Warning: fail_over_mac only affects "
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"active-backup mode.\n");
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/* fill params struct with the proper values */
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params->mode = bond_mode;
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params->xmit_policy = xmit_hashtype;
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@ -4732,6 +4746,7 @@ static int bond_check_params(struct bond_params *params)
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params->use_carrier = use_carrier;
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params->lacp_fast = lacp_fast;
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params->primary[0] = 0;
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params->fail_over_mac = fail_over_mac;
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if (primary) {
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strncpy(params->primary, primary, IFNAMSIZ);
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@ -567,6 +567,54 @@ static ssize_t bonding_store_arp_validate(struct device *d,
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static DEVICE_ATTR(arp_validate, S_IRUGO | S_IWUSR, bonding_show_arp_validate, bonding_store_arp_validate);
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/*
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* Show and store fail_over_mac. User only allowed to change the
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* value when there are no slaves.
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*/
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static ssize_t bonding_show_fail_over_mac(struct device *d, struct device_attribute *attr, char *buf)
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{
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struct bonding *bond = to_bond(d);
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return sprintf(buf, "%d\n", bond->params.fail_over_mac) + 1;
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}
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static ssize_t bonding_store_fail_over_mac(struct device *d, struct device_attribute *attr, const char *buf, size_t count)
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{
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int new_value;
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int ret = count;
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struct bonding *bond = to_bond(d);
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if (bond->slave_cnt != 0) {
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printk(KERN_ERR DRV_NAME
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": %s: Can't alter fail_over_mac with slaves in bond.\n",
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bond->dev->name);
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ret = -EPERM;
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goto out;
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}
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if (sscanf(buf, "%d", &new_value) != 1) {
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printk(KERN_ERR DRV_NAME
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": %s: no fail_over_mac value specified.\n",
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bond->dev->name);
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ret = -EINVAL;
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goto out;
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}
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if ((new_value == 0) || (new_value == 1)) {
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bond->params.fail_over_mac = new_value;
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printk(KERN_INFO DRV_NAME ": %s: Setting fail_over_mac to %d.\n",
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bond->dev->name, new_value);
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} else {
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printk(KERN_INFO DRV_NAME
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": %s: Ignoring invalid fail_over_mac value %d.\n",
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bond->dev->name, new_value);
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}
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out:
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return ret;
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}
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static DEVICE_ATTR(fail_over_mac, S_IRUGO | S_IWUSR, bonding_show_fail_over_mac, bonding_store_fail_over_mac);
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/*
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* Show and set the arp timer interval. There are two tricky bits
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* here. First, if ARP monitoring is activated, then we must disable
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@ -1388,6 +1436,7 @@ static DEVICE_ATTR(ad_partner_mac, S_IRUGO, bonding_show_ad_partner_mac, NULL);
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static struct attribute *per_bond_attrs[] = {
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&dev_attr_slaves.attr,
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&dev_attr_mode.attr,
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&dev_attr_fail_over_mac.attr,
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&dev_attr_arp_validate.attr,
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&dev_attr_arp_interval.attr,
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&dev_attr_arp_ip_target.attr,
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@ -22,8 +22,8 @@
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#include "bond_3ad.h"
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#include "bond_alb.h"
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#define DRV_VERSION "3.1.3"
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#define DRV_RELDATE "June 13, 2007"
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#define DRV_VERSION "3.2.0"
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#define DRV_RELDATE "September 13, 2007"
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#define DRV_NAME "bonding"
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#define DRV_DESCRIPTION "Ethernet Channel Bonding Driver"
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@ -128,6 +128,7 @@ struct bond_params {
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int arp_interval;
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int arp_validate;
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int use_carrier;
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int fail_over_mac;
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int updelay;
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int downdelay;
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int lacp_fast;
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@ -186,7 +187,6 @@ struct bonding {
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struct timer_list mii_timer;
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struct timer_list arp_timer;
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s8 kill_timers;
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s8 do_set_mac_addr;
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s8 send_grat_arp;
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s8 setup_by_slave;
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struct net_device_stats stats;
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