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List: linux-netdev
Subject: PATCH 2.4.3.7: net drvr probe fix
From: Jeff Garzik <jgarzik () mandrakesoft ! com>
Date: 2001-03-25 22:41:58
[Download RAW message or body]
The attached patch provides a solution for the problem where an
interface is not completely ready by the time /sbin/hotplug is called,
from init_etherdev. The patch also includes semi-related cleanups and
fixes found along the way.
Changes:
* Add alloc_etherdev, alloc_fddidev, alloc_hippi_dev, alloc_trdev, alloc_fcdev
* Add register_hipdev for API completeness
* Add inline source docs for init_fddidev, init_hippi_dev, init_trdev,
init_fcdev
* Move EXPORT_SYMBOL for public functions from net/netsyms.c to
drivers/net/net_init.c.
* Remove duplicate code by making unregister_foo functions simply call
unregister_netdev()
* Remove duplicate code by making register_foo functions simply call
new static function __register_netdev()
* Propagate returned error codes in register_netdev()
* Rename private tr_configure() to public tr_setup(), and remove no-op
tr_setup() function.
diff -u linux_2_4/drivers/net/net_init.c:1.1.1.8 linux_2_4/drivers/net/net_init.c:1.1.1.8.38.2
--- linux_2_4/drivers/net/net_init.c:1.1.1.8 Mon Feb 26 19:03:50 2001
+++ linux_2_4/drivers/net/net_init.c Sun Mar 25 12:43:06 2001
@@ -28,10 +28,12 @@
up. We now share common code and have regularised name
allocation setups. Abolished the 16 card limits.
03/19/2000 - jgarzik and Urban Widmark: init_etherdev 32-byte align
+ 03/21/2001 - jgarzik: alloc_etherdev and friends
*/
#include <linux/config.h>
+#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/types.h>
@@ -68,6 +70,33 @@
*/
+static struct net_device *alloc_netdev(int sizeof_priv, const char *mask,
+ void (*setup)(struct net_device *))
+{
+ struct net_device *dev;
+ int alloc_size;
+
+ /* ensure 32-byte alignment of the private area */
+ alloc_size = sizeof (*dev) + sizeof_priv + 31;
+
+ dev = (struct net_device *) kmalloc (alloc_size, GFP_KERNEL);
+ if (dev == NULL)
+ {
+ printk(KERN_ERR "alloc_dev: Unable to allocate device memory.\n");
+ return NULL;
+ }
+
+ memset(dev, 0, alloc_size);
+
+ if (sizeof_priv)
+ dev->priv = (void *) (((long)(dev + 1) + 31) & ~31);
+
+ setup(dev);
+ strcpy(dev->name, mask);
+
+ return dev;
+}
+
static struct net_device *init_alloc_dev(int sizeof_priv)
{
struct net_device *dev;
@@ -142,6 +171,17 @@
return dev;
}
+static int __register_netdev(struct net_device *dev)
+{
+ dev_init_buffers(dev);
+
+ if (dev->init && dev->init(dev) != 0) {
+ unregister_netdev(dev);
+ return -EIO;
+ }
+ return 0;
+}
+
/**
* init_etherdev - Register ethernet device
* @dev: An ethernet device structure to be filled in, or %NULL if a new
@@ -164,6 +204,25 @@
return init_netdev(dev, sizeof_priv, "eth%d", ether_setup);
}
+/**
+ * alloc_etherdev - Register ethernet device
+ * @sizeof_priv: Size of additional driver-private structure to be allocated
+ * for this ethernet device
+ *
+ * Fill in the fields of the device structure with ethernet-generic values.
+ *
+ * Constructs a new net device, complete with a private data area of
+ * size @sizeof_priv. A 32-byte (not bit) alignment is enforced for
+ * this private data area.
+ */
+
+struct net_device *alloc_etherdev(int sizeof_priv)
+{
+ return alloc_netdev(sizeof_priv, "eth%d", ether_setup);
+}
+
+EXPORT_SYMBOL(init_etherdev);
+EXPORT_SYMBOL(alloc_etherdev);
static int eth_mac_addr(struct net_device *dev, void *p)
{
@@ -184,11 +243,48 @@
#ifdef CONFIG_FDDI
+/**
+ * init_fddidev - Register FDDI device
+ * @dev: A FDDI device structure to be filled in, or %NULL if a new
+ * struct should be allocated.
+ * @sizeof_priv: Size of additional driver-private structure to be allocated
+ * for this ethernet device
+ *
+ * Fill in the fields of the device structure with FDDI-generic values.
+ *
+ * If no device structure is passed, a new one is constructed, complete with
+ * a private data area of size @sizeof_priv. A 32-byte (not bit)
+ * alignment is enforced for this private data area.
+ *
+ * If an empty string area is passed as dev->name, or a new structure is made,
+ * a new name string is constructed.
+ */
+
struct net_device *init_fddidev(struct net_device *dev, int sizeof_priv)
{
return init_netdev(dev, sizeof_priv, "fddi%d", fddi_setup);
}
+/**
+ * alloc_fddidev - Register FDDI device
+ * @sizeof_priv: Size of additional driver-private structure to be allocated
+ * for this FDDI device
+ *
+ * Fill in the fields of the device structure with FDDI-generic values.
+ *
+ * Constructs a new net device, complete with a private data area of
+ * size @sizeof_priv. A 32-byte (not bit) alignment is enforced for
+ * this private data area.
+ */
+
+struct net_device *alloc_fddidev(int sizeof_priv)
+{
+ return alloc_netdev(sizeof_priv, "fddi%d", fddi_setup);
+}
+
+EXPORT_SYMBOL(init_fddidev);
+EXPORT_SYMBOL(alloc_fddidev);
+
static int fddi_change_mtu(struct net_device *dev, int new_mtu)
{
if ((new_mtu < FDDI_K_SNAP_HLEN) || (new_mtu > FDDI_K_SNAP_DLEN))
@@ -227,19 +323,59 @@
}
+/**
+ * init_hippi_dev - Register HIPPI device
+ * @dev: A HIPPI device structure to be filled in, or %NULL if a new
+ * struct should be allocated.
+ * @sizeof_priv: Size of additional driver-private structure to be allocated
+ * for this ethernet device
+ *
+ * Fill in the fields of the device structure with HIPPI-generic values.
+ *
+ * If no device structure is passed, a new one is constructed, complete with
+ * a private data area of size @sizeof_priv. A 32-byte (not bit)
+ * alignment is enforced for this private data area.
+ *
+ * If an empty string area is passed as dev->name, or a new structure is made,
+ * a new name string is constructed.
+ */
+
struct net_device *init_hippi_dev(struct net_device *dev, int sizeof_priv)
{
return init_netdev(dev, sizeof_priv, "hip%d", hippi_setup);
}
+/**
+ * alloc_hippi_dev - Register HIPPI device
+ * @sizeof_priv: Size of additional driver-private structure to be allocated
+ * for this HIPPI device
+ *
+ * Fill in the fields of the device structure with HIPPI-generic values.
+ *
+ * Constructs a new net device, complete with a private data area of
+ * size @sizeof_priv. A 32-byte (not bit) alignment is enforced for
+ * this private data area.
+ */
+struct net_device *alloc_hippi_dev(int sizeof_priv)
+{
+ return alloc_netdev(sizeof_priv, "hip%d", hippi_setup);
+}
+
+int register_hipdev(struct net_device *dev)
+{
+ return __register_netdev(dev);
+}
+
void unregister_hipdev(struct net_device *dev)
{
- rtnl_lock();
- unregister_netdevice(dev);
- rtnl_unlock();
+ unregister_netdev(dev);
}
+EXPORT_SYMBOL(init_hippi_dev);
+EXPORT_SYMBOL(alloc_hippi_dev);
+EXPORT_SYMBOL(register_hipdev);
+EXPORT_SYMBOL(unregister_hipdev);
static int hippi_neigh_setup_dev(struct net_device *dev, struct neigh_parms *p)
{
@@ -283,6 +419,7 @@
dev_init_buffers(dev);
}
+EXPORT_SYMBOL(ether_setup);
#ifdef CONFIG_FDDI
@@ -312,6 +449,7 @@
return;
}
+EXPORT_SYMBOL(fddi_setup);
#endif /* CONFIG_FDDI */
@@ -349,6 +487,7 @@
dev_init_buffers(dev);
}
+EXPORT_SYMBOL(hippi_setup);
#endif /* CONFIG_HIPPI */
#if defined(CONFIG_ATALK) || defined(CONFIG_ATALK_MODULE)
@@ -387,6 +526,7 @@
dev_init_buffers(dev);
}
+EXPORT_SYMBOL(ltalk_setup);
#endif /* CONFIG_ATALK || CONFIG_ATALK_MODULE */
@@ -403,8 +543,8 @@
if (strchr(dev->name, '%'))
{
- err = -EBUSY;
- if(dev_alloc_name(dev, dev->name)<0)
+ err = dev_alloc_name(dev, dev->name);
+ if (err < 0)
goto out;
}
@@ -414,17 +554,12 @@
if (dev->name[0]==0 || dev->name[0]==' ')
{
- err = -EBUSY;
- if(dev_alloc_name(dev, "eth%d")<0)
+ err = dev_alloc_name(dev, "eth%d");
+ if (err < 0)
goto out;
}
-
-
- err = -EIO;
- if (register_netdevice(dev))
- goto out;
- err = 0;
+ err = register_netdevice(dev);
out:
rtnl_unlock();
@@ -438,10 +573,12 @@
rtnl_unlock();
}
+EXPORT_SYMBOL(register_netdev);
+EXPORT_SYMBOL(unregister_netdev);
#ifdef CONFIG_TR
-static void tr_configure(struct net_device *dev)
+void tr_setup(struct net_device *dev)
{
/*
* Configure and register
@@ -462,32 +599,61 @@
dev->flags = IFF_BROADCAST | IFF_MULTICAST ;
}
+/**
+ * init_trdev - Register token ring device
+ * @dev: A token ring device structure to be filled in, or %NULL if a new
+ * struct should be allocated.
+ * @sizeof_priv: Size of additional driver-private structure to be allocated
+ * for this ethernet device
+ *
+ * Fill in the fields of the device structure with token ring-generic values.
+ *
+ * If no device structure is passed, a new one is constructed, complete with
+ * a private data area of size @sizeof_priv. A 32-byte (not bit)
+ * alignment is enforced for this private data area.
+ *
+ * If an empty string area is passed as dev->name, or a new structure is made,
+ * a new name string is constructed.
+ */
+
struct net_device *init_trdev(struct net_device *dev, int sizeof_priv)
{
- return init_netdev(dev, sizeof_priv, "tr%d", tr_configure);
+ return init_netdev(dev, sizeof_priv, "tr%d", tr_setup);
}
-void tr_setup(struct net_device *dev)
+/**
+ * alloc_trdev - Register token ring device
+ * @sizeof_priv: Size of additional driver-private structure to be allocated
+ * for this token ring device
+ *
+ * Fill in the fields of the device structure with token ring-generic values.
+ *
+ * Constructs a new net device, complete with a private data area of
+ * size @sizeof_priv. A 32-byte (not bit) alignment is enforced for
+ * this private data area.
+ */
+
+struct net_device *alloc_trdev(int sizeof_priv)
{
+ return alloc_netdev(sizeof_priv, "tr%d", tr_setup);
}
int register_trdev(struct net_device *dev)
{
- dev_init_buffers(dev);
-
- if (dev->init && dev->init(dev) != 0) {
- unregister_trdev(dev);
- return -EIO;
- }
- return 0;
+ return __register_netdev(dev);
}
void unregister_trdev(struct net_device *dev)
{
- rtnl_lock();
- unregister_netdevice(dev);
- rtnl_unlock();
+ unregister_netdev(dev);
}
+
+EXPORT_SYMBOL(tr_setup);
+EXPORT_SYMBOL(init_trdev);
+EXPORT_SYMBOL(alloc_trdev);
+EXPORT_SYMBOL(register_trdev);
+EXPORT_SYMBOL(unregister_trdev);
+
#endif /* CONFIG_TR */
@@ -509,31 +675,62 @@
/* New-style flags. */
dev->flags = IFF_BROADCAST;
dev_init_buffers(dev);
- return;
}
+/**
+ * init_fcdev - Register fibre channel device
+ * @dev: A fibre channel device structure to be filled in, or %NULL if a new
+ * struct should be allocated.
+ * @sizeof_priv: Size of additional driver-private structure to be allocated
+ * for this ethernet device
+ *
+ * Fill in the fields of the device structure with fibre channel-generic values.
+ *
+ * If no device structure is passed, a new one is constructed, complete with
+ * a private data area of size @sizeof_priv. A 32-byte (not bit)
+ * alignment is enforced for this private data area.
+ *
+ * If an empty string area is passed as dev->name, or a new structure is made,
+ * a new name string is constructed.
+ */
struct net_device *init_fcdev(struct net_device *dev, int sizeof_priv)
{
return init_netdev(dev, sizeof_priv, "fc%d", fc_setup);
}
+/**
+ * alloc_fcdev - Register fibre channel device
+ * @sizeof_priv: Size of additional driver-private structure to be allocated
+ * for this fibre channel device
+ *
+ * Fill in the fields of the device structure with fibre channel-generic values.
+ *
+ * Constructs a new net device, complete with a private data area of
+ * size @sizeof_priv. A 32-byte (not bit) alignment is enforced for
+ * this private data area.
+ */
+
+struct net_device *alloc_fcdev(int sizeof_priv)
+{
+ return alloc_netdev(sizeof_priv, "fc%d", fc_setup);
+}
+
int register_fcdev(struct net_device *dev)
{
- dev_init_buffers(dev);
- if (dev->init && dev->init(dev) != 0) {
- unregister_fcdev(dev);
- return -EIO;
- }
- return 0;
+ return __register_netdev(dev);
}
void unregister_fcdev(struct net_device *dev)
{
- rtnl_lock();
- unregister_netdevice(dev);
- rtnl_unlock();
+ unregister_netdev(dev);
}
+
+EXPORT_SYMBOL(fc_setup);
+EXPORT_SYMBOL(init_fcdev);
+EXPORT_SYMBOL(alloc_fcdev);
+EXPORT_SYMBOL(register_fcdev);
+EXPORT_SYMBOL(unregister_fcdev);
#endif /* CONFIG_NET_FC */
diff -u linux_2_4/include/linux/etherdevice.h:1.1.1.15 linux_2_4/include/linux/etherdevice.h:1.1.1.15.4.1
--- linux_2_4/include/linux/etherdevice.h:1.1.1.15 Fri Mar 23 08:14:53 2001
+++ linux_2_4/include/linux/etherdevice.h Fri Mar 23 20:04:23 2001
@@ -38,19 +38,28 @@
struct hh_cache *hh);
extern int eth_header_parse(struct sk_buff *skb,
unsigned char *haddr);
-extern struct net_device * init_etherdev(struct net_device *, int);
+extern struct net_device *init_etherdev(struct net_device *dev, int sizeof_priv);
+extern struct net_device *alloc_etherdev(int sizeof_priv);
-static __inline__ void eth_copy_and_sum (struct sk_buff *dest, unsigned char *src, int len, int base)
+static inline void eth_copy_and_sum (struct sk_buff *dest, unsigned char *src, int len, int base)
{
memcpy (dest->data, src, len);
}
-/* Check that the ethernet address (MAC) is not 00:00:00:00:00:00 and is not
- * a multicast address. Return true if the address is valid.
+/**
+ * is_valid_ether_addr - Determine if the given Ethernet address is valid
+ * @addr: Pointer to a six-byte array containing the Ethernet address
+ *
+ * Check that the Ethernet address (MAC) is not 00:00:00:00:00:00, is not
+ * a multicast address, and is not FF:FF:FF:FF:FF:FF.
+ *
+ * Return true if the address is valid.
*/
-static __inline__ int is_valid_ether_addr( u8 *addr )
+static inline int is_valid_ether_addr( u8 *addr )
{
- return !(addr[0]&1) && memcmp( addr, "\0\0\0\0\0\0", 6);
+ const char zaddr[6] = {0,};
+
+ return !(addr[0]&1) && memcmp( addr, zaddr, 6);
}
#endif
diff -u linux_2_4/include/linux/fcdevice.h:1.1.1.1 linux_2_4/include/linux/fcdevice.h:1.1.1.1.182.1
--- linux_2_4/include/linux/fcdevice.h:1.1.1.1 Sun Oct 22 12:36:14 2000
+++ linux_2_4/include/linux/fcdevice.h Fri Mar 23 20:04:23 2001
@@ -33,7 +33,10 @@
extern int fc_rebuild_header(struct sk_buff *skb);
//extern unsigned short fc_type_trans(struct sk_buff *skb, struct net_device *dev);
-extern struct net_device * init_fcdev(struct net_device *, int);
+extern struct net_device *init_fcdev(struct net_device *dev, int sizeof_priv);
+extern struct net_device *alloc_fcdev(int sizeof_priv);
+extern int register_fcdev(struct net_device *dev);
+extern void unregister_fcdev(struct net_device *dev);
#endif
diff -u linux_2_4/include/linux/fddidevice.h:1.1.1.2 linux_2_4/include/linux/fddidevice.h:1.1.1.2.174.1
--- linux_2_4/include/linux/fddidevice.h:1.1.1.2 Sun Oct 22 13:44:24 2000
+++ linux_2_4/include/linux/fddidevice.h Fri Mar 23 20:04:23 2001
@@ -34,7 +34,8 @@
extern int fddi_rebuild_header(struct sk_buff *skb);
extern unsigned short fddi_type_trans(struct sk_buff *skb,
struct net_device *dev);
-extern struct net_device * init_fddidev(struct net_device *, int);
+extern struct net_device *init_fddidev(struct net_device *dev, int sizeof_priv);
+extern struct net_device *alloc_fddidev(int sizeof_priv);
#endif
#endif /* _LINUX_FDDIDEVICE_H */
diff -u linux_2_4/include/linux/hippidevice.h:1.1.1.1 linux_2_4/include/linux/hippidevice.h:1.1.1.1.182.1
--- linux_2_4/include/linux/hippidevice.h:1.1.1.1 Sun Oct 22 12:36:13 2000
+++ linux_2_4/include/linux/hippidevice.h Fri Mar 23 20:04:23 2001
@@ -51,7 +51,9 @@
extern void hippi_net_init(void);
void hippi_setup(struct net_device *dev);
-extern struct net_device *init_hippi_dev(struct net_device *, int);
+extern struct net_device *init_hippi_dev(struct net_device *dev, int sizeof_priv);
+extern struct net_device *alloc_hippi_dev(int sizeof_priv);
+extern int register_hipdev(struct net_device *dev);
extern void unregister_hipdev(struct net_device *dev);
#endif
diff -u linux_2_4/include/linux/netdevice.h:1.1.1.23 linux_2_4/include/linux/netdevice.h:1.1.1.23.2.1
--- linux_2_4/include/linux/netdevice.h:1.1.1.23 Fri Mar 23 19:21:18 2001
+++ linux_2_4/include/linux/netdevice.h Fri Mar 23 20:04:23 2001
@@ -41,6 +41,9 @@
struct divert_blk;
+#define HAVE_ALLOC_NETDEV /* feature macro: alloc_xxxdev
+ functions are available. */
+
#define NET_XMIT_SUCCESS 0
#define NET_XMIT_DROP 1 /* skb dropped */
#define NET_XMIT_CN 2 /* congestion notification */
@@ -633,10 +636,6 @@
/* Support for loadable net-drivers */
extern int register_netdev(struct net_device *dev);
extern void unregister_netdev(struct net_device *dev);
-extern int register_trdev(struct net_device *dev);
-extern void unregister_trdev(struct net_device *dev);
-extern int register_fcdev(struct net_device *dev);
-extern void unregister_fcdev(struct net_device *dev);
/* Functions used for multicast support */
extern void dev_mc_upload(struct net_device *dev);
extern int dev_mc_delete(struct net_device *dev, void *addr, int alen, int all);
diff -u linux_2_4/include/linux/trdevice.h:1.1.1.1 linux_2_4/include/linux/trdevice.h:1.1.1.1.182.1
--- linux_2_4/include/linux/trdevice.h:1.1.1.1 Sun Oct 22 12:36:03 2000
+++ linux_2_4/include/linux/trdevice.h Fri Mar 23 20:04:23 2001
@@ -33,7 +33,10 @@
void *saddr, unsigned len);
extern int tr_rebuild_header(struct sk_buff *skb);
extern unsigned short tr_type_trans(struct sk_buff *skb, struct net_device *dev);
-extern struct net_device * init_trdev(struct net_device *, int);
+extern struct net_device *init_trdev(struct net_device *dev, int sizeof_priv);
+extern struct net_device *alloc_trdev(int sizeof_priv);
+extern int register_trdev(struct net_device *dev);
+extern void unregister_trdev(struct net_device *dev);
#endif
diff -u linux_2_4/net/netsyms.c:1.1.1.25 linux_2_4/net/netsyms.c:1.1.1.25.2.1
--- linux_2_4/net/netsyms.c:1.1.1.25 Fri Mar 23 19:23:31 2001
+++ linux_2_4/net/netsyms.c Fri Mar 23 20:04:23 2001
@@ -432,33 +432,19 @@
#endif /* CONFIG_INET */
#ifdef CONFIG_TR
-EXPORT_SYMBOL(tr_setup);
EXPORT_SYMBOL(tr_type_trans);
-EXPORT_SYMBOL(register_trdev);
-EXPORT_SYMBOL(unregister_trdev);
-EXPORT_SYMBOL(init_trdev);
#endif
-#ifdef CONFIG_NET_FC
-EXPORT_SYMBOL(register_fcdev);
-EXPORT_SYMBOL(unregister_fcdev);
-EXPORT_SYMBOL(init_fcdev);
-#endif
-
/* Device callback registration */
EXPORT_SYMBOL(register_netdevice_notifier);
EXPORT_SYMBOL(unregister_netdevice_notifier);
/* support for loadable net drivers */
#ifdef CONFIG_NET
-EXPORT_SYMBOL(init_etherdev);
EXPORT_SYMBOL(loopback_dev);
EXPORT_SYMBOL(register_netdevice);
EXPORT_SYMBOL(unregister_netdevice);
-EXPORT_SYMBOL(register_netdev);
-EXPORT_SYMBOL(unregister_netdev);
EXPORT_SYMBOL(netdev_state_change);
-EXPORT_SYMBOL(ether_setup);
EXPORT_SYMBOL(dev_new_index);
EXPORT_SYMBOL(dev_get_by_index);
EXPORT_SYMBOL(__dev_get_by_index);
@@ -469,8 +455,6 @@
EXPORT_SYMBOL(eth_type_trans);
#ifdef CONFIG_FDDI
EXPORT_SYMBOL(fddi_type_trans);
-EXPORT_SYMBOL(fddi_setup);
-EXPORT_SYMBOL(init_fddidev);
#endif /* CONFIG_FDDI */
#if 0
EXPORT_SYMBOL(eth_copy_and_sum);
@@ -511,8 +495,6 @@
#ifdef CONFIG_HIPPI
EXPORT_SYMBOL(hippi_type_trans);
-EXPORT_SYMBOL(init_hippi_dev);
-EXPORT_SYMBOL(unregister_hipdev);
#endif
#ifdef CONFIG_SYSCTL
@@ -522,12 +504,6 @@
EXPORT_SYMBOL(sysctl_ip_default_ttl);
#endif
#endif
-
-#if defined(CONFIG_ATALK) || defined(CONFIG_ATALK_MODULE)
-#include<linux/if_ltalk.h>
-EXPORT_SYMBOL(ltalk_setup);
-#endif
-
/* Packet scheduler modules want these. */
EXPORT_SYMBOL(qdisc_destroy);
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