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Message-Id: <11847582511783-git-send-email-crquan@gmail.com>
Date: Wed, 18 Jul 2007 19:30:29 +0800
From: Denis Cheng <crquan@...il.com>
To: David Miller <davem@...emloft.net>
Cc: netdev@...r.kernel.org, kuznet@....inr.ac.ru,
Patrick McHardy <kaber@...sh.net>, pekkas@...core.fi,
jmorris@...ei.org, linux-kernel@...r.kernel.org,
Denis Cheng <crquan@...il.com>
Subject: [PATCH 2/2] net/core: some functions' definition order adjustment for readability
Signed-off-by: Denis Cheng <crquan@...il.com>
---
net/core/dev.c | 407 ++++++++++++++++++++++++++++----------------------------
1 files changed, 201 insertions(+), 206 deletions(-)
diff --git a/net/core/dev.c b/net/core/dev.c
index 16842af..ee567dd 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -2790,6 +2790,134 @@ int dev_unicast_add(struct net_device *dev, void *addr, int alen)
}
EXPORT_SYMBOL(dev_unicast_add);
+/*
+ * Device multicast list maintenance.
+ *
+ * This is used both by IP and by the user level maintenance functions.
+ * Unlike BSD we maintain a usage count on a given multicast address so
+ * that a casual user application can add/delete multicasts used by
+ * protocols without doing damage to the protocols when it deletes the
+ * entries. It also helps IP as it tracks overlapping maps.
+ *
+ * Device mc lists are changed by bh at least if IPv6 is enabled,
+ * so that it must be bh protected.
+ *
+ * We block accesses to device mc filters with netif_tx_lock.
+ */
+
+/*
+ * Delete a device level multicast
+ */
+int dev_mc_delete(struct net_device *dev, void *addr, int alen, int glbl)
+{
+ int err;
+
+ netif_tx_lock_bh(dev);
+ err = __dev_addr_delete(&dev->mc_list, &dev->mc_count,
+ addr, alen, glbl);
+ if (!err) {
+ /*
+ * We have altered the list, so the card
+ * loaded filter is now wrong. Fix it
+ */
+
+ __dev_set_rx_mode(dev);
+ }
+ netif_tx_unlock_bh(dev);
+ return err;
+}
+EXPORT_SYMBOL(dev_mc_delete);
+
+/*
+ * Add a device level multicast
+ */
+int dev_mc_add(struct net_device *dev, void *addr, int alen, int glbl)
+{
+ int err;
+
+ netif_tx_lock_bh(dev);
+ err = __dev_addr_add(&dev->mc_list, &dev->mc_count, addr, alen, glbl);
+ if (!err)
+ __dev_set_rx_mode(dev);
+ netif_tx_unlock_bh(dev);
+ return err;
+}
+EXPORT_SYMBOL(dev_mc_add);
+
+/**
+ * dev_mc_sync - Synchronize device's multicast list to another device
+ * @to: destination device
+ * @from: source device
+ *
+ * Add newly added addresses to the destination device and release
+ * addresses that have no users left. The source device must be
+ * locked by netif_tx_lock_bh.
+ *
+ * This function is intended to be called from the dev->set_multicast_list
+ * function of layered software devices.
+ */
+int dev_mc_sync(struct net_device *to, struct net_device *from)
+{
+ struct dev_addr_list *da;
+ int err = 0;
+
+ netif_tx_lock_bh(to);
+ for (da = from->mc_list; da != NULL; da = da->next) {
+ if (!da->da_synced) {
+ err = __dev_addr_add(&to->mc_list, &to->mc_count,
+ da->da_addr, da->da_addrlen, 0);
+ if (err < 0)
+ break;
+ da->da_synced = 1;
+ da->da_users++;
+ } else if (da->da_users == 1) {
+ __dev_addr_delete(&to->mc_list, &to->mc_count,
+ da->da_addr, da->da_addrlen, 0);
+ __dev_addr_delete(&from->mc_list, &from->mc_count,
+ da->da_addr, da->da_addrlen, 0);
+ }
+ }
+ if (!err)
+ __dev_set_rx_mode(to);
+ netif_tx_unlock_bh(to);
+
+ return err;
+}
+EXPORT_SYMBOL(dev_mc_sync);
+
+/**
+ * dev_mc_unsync - Remove synchronized addresses from the destination
+ * device
+ * @to: destination device
+ * @from: source device
+ *
+ * Remove all addresses that were added to the destination device by
+ * dev_mc_sync(). This function is intended to be called from the
+ * dev->stop function of layered software devices.
+ */
+void dev_mc_unsync(struct net_device *to, struct net_device *from)
+{
+ struct dev_addr_list *da;
+
+ netif_tx_lock_bh(from);
+ netif_tx_lock_bh(to);
+
+ for (da = from->mc_list; da != NULL; da = da->next) {
+ if (!da->da_synced)
+ continue;
+ __dev_addr_delete(&to->mc_list, &to->mc_count,
+ da->da_addr, da->da_addrlen, 0);
+ da->da_synced = 0;
+ __dev_addr_delete(&from->mc_list, &from->mc_count,
+ da->da_addr, da->da_addrlen, 0);
+ }
+ __dev_set_rx_mode(to);
+
+ netif_tx_unlock_bh(to);
+ netif_tx_unlock_bh(from);
+}
+EXPORT_SYMBOL(dev_mc_unsync);
+
static void __dev_addr_discard(struct dev_addr_list **list)
{
struct dev_addr_list *tmp;
@@ -3963,6 +4091,79 @@ static int __init netdev_dma_register(void)
static int __init netdev_dma_register(void) { return -ENODEV; }
#endif /* CONFIG_NET_DMA */
+#ifdef CONFIG_PROC_FS
+static void *dev_mc_seq_start(struct seq_file *seq, loff_t *pos)
+{
+ struct net_device *dev;
+ loff_t off = 0;
+
+ read_lock(&dev_base_lock);
+ for_each_netdev(dev) {
+ if (off++ == *pos)
+ return dev;
+ }
+ return NULL;
+}
+
+static void *dev_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
+{
+ ++*pos;
+ return next_net_device((struct net_device *)v);
+}
+
+static void dev_mc_seq_stop(struct seq_file *seq, void *v)
+{
+ read_unlock(&dev_base_lock);
+}
+
+static int dev_mc_seq_show(struct seq_file *seq, void *v)
+{
+ struct dev_addr_list *m;
+ struct net_device *dev = v;
+
+ netif_tx_lock_bh(dev);
+ for (m = dev->mc_list; m; m = m->next) {
+ int i;
+
+ seq_printf(seq, "%-4d %-15s %-5d %-5d ", dev->ifindex,
+ dev->name, m->dmi_users, m->dmi_gusers);
+
+ for (i = 0; i < m->dmi_addrlen; i++)
+ seq_printf(seq, "%02x", m->dmi_addr[i]);
+
+ seq_putc(seq, '\n');
+ }
+ netif_tx_unlock_bh(dev);
+ return 0;
+}
+
+static const struct seq_operations dev_mc_seq_ops = {
+ .start = dev_mc_seq_start,
+ .next = dev_mc_seq_next,
+ .stop = dev_mc_seq_stop,
+ .show = dev_mc_seq_show,
+};
+
+static int dev_mc_seq_open(struct inode *inode, struct file *file)
+{
+ return seq_open(file, &dev_mc_seq_ops);
+}
+
+static const struct file_operations dev_mc_seq_fops = {
+ .owner = THIS_MODULE,
+ .open = dev_mc_seq_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = seq_release,
+};
+
+#endif
+
+void __init dev_mcast_init(void)
+{
+ proc_net_fops_create("dev_mcast", 0, &dev_mc_seq_fops);
+}
+
/*
* Initialize the DEV module. At boot time this walks the device list and
* unhooks any devices that fail to initialise (normally hardware not
@@ -4076,209 +4277,3 @@ EXPORT_SYMBOL(dev_load);
#endif
EXPORT_PER_CPU_SYMBOL(softnet_data);
-
-/*
- * Device multicast list maintenance.
- *
- * This is used both by IP and by the user level maintenance functions.
- * Unlike BSD we maintain a usage count on a given multicast address so
- * that a casual user application can add/delete multicasts used by
- * protocols without doing damage to the protocols when it deletes the
- * entries. It also helps IP as it tracks overlapping maps.
- *
- * Device mc lists are changed by bh at least if IPv6 is enabled,
- * so that it must be bh protected.
- *
- * We block accesses to device mc filters with netif_tx_lock.
- */
-
-/*
- * Delete a device level multicast
- */
-
-int dev_mc_delete(struct net_device *dev, void *addr, int alen, int glbl)
-{
- int err;
-
- netif_tx_lock_bh(dev);
- err = __dev_addr_delete(&dev->mc_list, &dev->mc_count,
- addr, alen, glbl);
- if (!err) {
- /*
- * We have altered the list, so the card
- * loaded filter is now wrong. Fix it
- */
-
- __dev_set_rx_mode(dev);
- }
- netif_tx_unlock_bh(dev);
- return err;
-}
-
-/*
- * Add a device level multicast
- */
-
-int dev_mc_add(struct net_device *dev, void *addr, int alen, int glbl)
-{
- int err;
-
- netif_tx_lock_bh(dev);
- err = __dev_addr_add(&dev->mc_list, &dev->mc_count, addr, alen, glbl);
- if (!err)
- __dev_set_rx_mode(dev);
- netif_tx_unlock_bh(dev);
- return err;
-}
-
-/**
- * dev_mc_sync - Synchronize device's multicast list to another device
- * @to: destination device
- * @from: source device
- *
- * Add newly added addresses to the destination device and release
- * addresses that have no users left. The source device must be
- * locked by netif_tx_lock_bh.
- *
- * This function is intended to be called from the dev->set_multicast_list
- * function of layered software devices.
- */
-int dev_mc_sync(struct net_device *to, struct net_device *from)
-{
- struct dev_addr_list *da;
- int err = 0;
-
- netif_tx_lock_bh(to);
- for (da = from->mc_list; da != NULL; da = da->next) {
- if (!da->da_synced) {
- err = __dev_addr_add(&to->mc_list, &to->mc_count,
- da->da_addr, da->da_addrlen, 0);
- if (err < 0)
- break;
- da->da_synced = 1;
- da->da_users++;
- } else if (da->da_users == 1) {
- __dev_addr_delete(&to->mc_list, &to->mc_count,
- da->da_addr, da->da_addrlen, 0);
- __dev_addr_delete(&from->mc_list, &from->mc_count,
- da->da_addr, da->da_addrlen, 0);
- }
- }
- if (!err)
- __dev_set_rx_mode(to);
- netif_tx_unlock_bh(to);
-
- return err;
-}
-EXPORT_SYMBOL(dev_mc_sync);
-
-
-/**
- * dev_mc_unsync - Remove synchronized addresses from the destination
- * device
- * @to: destination device
- * @from: source device
- *
- * Remove all addresses that were added to the destination device by
- * dev_mc_sync(). This function is intended to be called from the
- * dev->stop function of layered software devices.
- */
-void dev_mc_unsync(struct net_device *to, struct net_device *from)
-{
- struct dev_addr_list *da;
-
- netif_tx_lock_bh(from);
- netif_tx_lock_bh(to);
-
- for (da = from->mc_list; da != NULL; da = da->next) {
- if (!da->da_synced)
- continue;
- __dev_addr_delete(&to->mc_list, &to->mc_count,
- da->da_addr, da->da_addrlen, 0);
- da->da_synced = 0;
- __dev_addr_delete(&from->mc_list, &from->mc_count,
- da->da_addr, da->da_addrlen, 0);
- }
- __dev_set_rx_mode(to);
-
- netif_tx_unlock_bh(to);
- netif_tx_unlock_bh(from);
-}
-EXPORT_SYMBOL(dev_mc_unsync);
-
-#ifdef CONFIG_PROC_FS
-static void *dev_mc_seq_start(struct seq_file *seq, loff_t *pos)
-{
- struct net_device *dev;
- loff_t off = 0;
-
- read_lock(&dev_base_lock);
- for_each_netdev(dev) {
- if (off++ == *pos)
- return dev;
- }
- return NULL;
-}
-
-static void *dev_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
-{
- ++*pos;
- return next_net_device((struct net_device *)v);
-}
-
-static void dev_mc_seq_stop(struct seq_file *seq, void *v)
-{
- read_unlock(&dev_base_lock);
-}
-
-
-static int dev_mc_seq_show(struct seq_file *seq, void *v)
-{
- struct dev_addr_list *m;
- struct net_device *dev = v;
-
- netif_tx_lock_bh(dev);
- for (m = dev->mc_list; m; m = m->next) {
- int i;
-
- seq_printf(seq, "%-4d %-15s %-5d %-5d ", dev->ifindex,
- dev->name, m->dmi_users, m->dmi_gusers);
-
- for (i = 0; i < m->dmi_addrlen; i++)
- seq_printf(seq, "%02x", m->dmi_addr[i]);
-
- seq_putc(seq, '\n');
- }
- netif_tx_unlock_bh(dev);
- return 0;
-}
-
-static const struct seq_operations dev_mc_seq_ops = {
- .start = dev_mc_seq_start,
- .next = dev_mc_seq_next,
- .stop = dev_mc_seq_stop,
- .show = dev_mc_seq_show,
-};
-
-static int dev_mc_seq_open(struct inode *inode, struct file *file)
-{
- return seq_open(file, &dev_mc_seq_ops);
-}
-
-static const struct file_operations dev_mc_seq_fops = {
- .owner = THIS_MODULE,
- .open = dev_mc_seq_open,
- .read = seq_read,
- .llseek = seq_lseek,
- .release = seq_release,
-};
-
-#endif
-
-void __init dev_mcast_init(void)
-{
- proc_net_fops_create("dev_mcast", 0, &dev_mc_seq_fops);
-}
-
-EXPORT_SYMBOL(dev_mc_add);
-EXPORT_SYMBOL(dev_mc_delete);
--
1.5.2.2
-
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