From: Jay Vosburgh Date: Sat, 14 Jun 2008 01:12:04 +0000 (-0700) Subject: bonding: Allow setting max_bonds to zero X-Git-Tag: v2.6.27-rc1~969^2~289^2~1 X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b8a9787eddb0e4665f31dd1d64584732b2b5d051;p=linux-2.6 bonding: Allow setting max_bonds to zero Permit bonding to function rationally if max_bonds is set to zero. This will load the module, but create no master devices (which can be created via sysfs). Requires some change to bond_create_sysfs; currently, the netdev sysfs directory is determined from the first bonding device created, but this is no longer possible. Instead, an interface from net/core is created to create and destroy files in net_class. Based on a patch submitted by Phil Oester . Modified by Jay Vosburgh to fix the sysfs issue mentioned above and to update the documentation. Signed-off-by: Phil Oester Signed-off-by: Jay Vosburgh Signed-off-by: Jeff Garzik --- diff --git a/Documentation/networking/bonding.txt b/Documentation/networking/bonding.txt index 370b7da73a..7fa7fe71d7 100644 --- a/Documentation/networking/bonding.txt +++ b/Documentation/networking/bonding.txt @@ -376,7 +376,8 @@ max_bonds Specifies the number of bonding devices to create for this instance of the bonding driver. E.g., if max_bonds is 3, and the bonding driver is not already loaded, then bond0, bond1 - and bond2 will be created. The default value is 1. + and bond2 will be created. The default value is 1. Specifying + a value of 0 will load bonding, but will not create any devices. miimon diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c index 3b6d66a8ab..d57b65dc2c 100644 --- a/drivers/net/bonding/bond_main.c +++ b/drivers/net/bonding/bond_main.c @@ -4750,11 +4750,11 @@ static int bond_check_params(struct bond_params *params) } } - if (max_bonds < 1 || max_bonds > INT_MAX) { + if (max_bonds < 0 || max_bonds > INT_MAX) { printk(KERN_WARNING DRV_NAME ": Warning: max_bonds (%d) not in range %d-%d, so it " "was reset to BOND_DEFAULT_MAX_BONDS (%d)\n", - max_bonds, 1, INT_MAX, BOND_DEFAULT_MAX_BONDS); + max_bonds, 0, INT_MAX, BOND_DEFAULT_MAX_BONDS); max_bonds = BOND_DEFAULT_MAX_BONDS; } @@ -4953,7 +4953,7 @@ static int bond_check_params(struct bond_params *params) printk("\n"); - } else { + } else if (max_bonds) { /* miimon and arp_interval not set, we need one so things * work as expected, see bonding.txt for details */ diff --git a/drivers/net/bonding/bond_sysfs.c b/drivers/net/bonding/bond_sysfs.c index dd265c69b0..6caac0ffb2 100644 --- a/drivers/net/bonding/bond_sysfs.c +++ b/drivers/net/bonding/bond_sysfs.c @@ -53,7 +53,6 @@ extern struct bond_parm_tbl arp_validate_tbl[]; extern struct bond_parm_tbl fail_over_mac_tbl[]; static int expected_refcount = -1; -static struct class *netdev_class; /*--------------------------- Data Structures -----------------------------*/ /* Bonding sysfs lock. Why can't we just use the subsystem lock? @@ -1447,19 +1446,9 @@ static struct attribute_group bonding_group = { */ int bond_create_sysfs(void) { - int ret = 0; - struct bonding *firstbond; - - /* get the netdev class pointer */ - firstbond = container_of(bond_dev_list.next, struct bonding, bond_list); - if (!firstbond) - return -ENODEV; - - netdev_class = firstbond->dev->dev.class; - if (!netdev_class) - return -ENODEV; + int ret; - ret = class_create_file(netdev_class, &class_attr_bonding_masters); + ret = netdev_class_create_file(&class_attr_bonding_masters); /* * Permit multiple loads of the module by ignoring failures to * create the bonding_masters sysfs file. Bonding devices @@ -1478,10 +1467,6 @@ int bond_create_sysfs(void) printk(KERN_ERR "network device named %s already exists in sysfs", class_attr_bonding_masters.attr.name); - else { - netdev_class = NULL; - return 0; - } } return ret; @@ -1493,8 +1478,7 @@ int bond_create_sysfs(void) */ void bond_destroy_sysfs(void) { - if (netdev_class) - class_remove_file(netdev_class, &class_attr_bonding_masters); + netdev_class_remove_file(&class_attr_bonding_masters); } /* diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h index e92fc839ab..9ccbfac3fd 100644 --- a/include/linux/netdevice.h +++ b/include/linux/netdevice.h @@ -1506,6 +1506,9 @@ extern void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos); extern void dev_seq_stop(struct seq_file *seq, void *v); #endif +extern int netdev_class_create_file(struct class_attribute *class_attr); +extern void netdev_class_remove_file(struct class_attribute *class_attr); + extern void linkwatch_run_queue(void); extern int netdev_compute_features(unsigned long all, unsigned long one); diff --git a/net/core/net-sysfs.c b/net/core/net-sysfs.c index dccd737ea2..3f79413192 100644 --- a/net/core/net-sysfs.c +++ b/net/core/net-sysfs.c @@ -468,6 +468,19 @@ int netdev_register_kobject(struct net_device *net) return device_add(dev); } +int netdev_class_create_file(struct class_attribute *class_attr) +{ + return class_create_file(&net_class, class_attr); +} + +void netdev_class_remove_file(struct class_attribute *class_attr) +{ + class_remove_file(&net_class, class_attr); +} + +EXPORT_SYMBOL(netdev_class_create_file); +EXPORT_SYMBOL(netdev_class_remove_file); + void netdev_initialize_kobject(struct net_device *net) { struct device *device = &(net->dev);