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Date: Mon, 15 Apr 2013 15:09:56 -0400
From: Vlad Yasevich <vyasevic@...hat.com>
To: netdev@...r.kernel.org
Cc: Vlad Yasevich <vyasevic@...hat.com>, Jiri Pirko <jiri@...nulli.us>
Subject: [PATCH 1/2] net: add dev_uc_sync_multiple() and dev_mc_sync_multiple() api
The current implementation of dev_uc_sync/unsync() assumes that there is
a strict 1-to-1 relationship between the source and destination of the case.
This is not always the case. Some virtual devices aggreated a number
of lower devices and need to sync the address to all of them. The current
API falls short there.
This patch introduces a new dev_uc_sync_multiple() api that can be called
in the above circumstances and allows sync to work for every invocation.
CC: Jiri Pirko <jiri@...nulli.us>
Signed-off-by: Vlad Yasevich <vyasevic@...hat.com>
---
include/linux/netdevice.h | 3 +
net/core/dev_addr_lists.c | 210 ++++++++++++++++++++++++++++++++++++---------
2 files changed, 171 insertions(+), 42 deletions(-)
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 6151e90..4c5d42a 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -211,6 +211,7 @@ struct netdev_hw_addr {
#define NETDEV_HW_ADDR_T_UNICAST 4
#define NETDEV_HW_ADDR_T_MULTICAST 5
bool global_use;
+ int sync_cnt;
int refcount;
int synced;
struct rcu_head rcu_head;
@@ -2621,6 +2622,7 @@ extern int dev_uc_add(struct net_device *dev, const unsigned char *addr);
extern int dev_uc_add_excl(struct net_device *dev, const unsigned char *addr);
extern int dev_uc_del(struct net_device *dev, const unsigned char *addr);
extern int dev_uc_sync(struct net_device *to, struct net_device *from);
+extern int dev_uc_sync_multiple(struct net_device *to, struct net_device *from);
extern void dev_uc_unsync(struct net_device *to, struct net_device *from);
extern void dev_uc_flush(struct net_device *dev);
extern void dev_uc_init(struct net_device *dev);
@@ -2632,6 +2634,7 @@ extern int dev_mc_add_excl(struct net_device *dev, const unsigned char *addr);
extern int dev_mc_del(struct net_device *dev, const unsigned char *addr);
extern int dev_mc_del_global(struct net_device *dev, const unsigned char *addr);
extern int dev_mc_sync(struct net_device *to, struct net_device *from);
+extern int dev_mc_sync_multiple(struct net_device *to, struct net_device *from);
extern void dev_mc_unsync(struct net_device *to, struct net_device *from);
extern void dev_mc_flush(struct net_device *dev);
extern void dev_mc_init(struct net_device *dev);
diff --git a/net/core/dev_addr_lists.c b/net/core/dev_addr_lists.c
index abdc9e6..c013f38 100644
--- a/net/core/dev_addr_lists.c
+++ b/net/core/dev_addr_lists.c
@@ -22,7 +22,8 @@
static int __hw_addr_create_ex(struct netdev_hw_addr_list *list,
const unsigned char *addr, int addr_len,
- unsigned char addr_type, bool global)
+ unsigned char addr_type, bool global,
+ bool sync)
{
struct netdev_hw_addr *ha;
int alloc_size;
@@ -37,7 +38,7 @@ static int __hw_addr_create_ex(struct netdev_hw_addr_list *list,
ha->type = addr_type;
ha->refcount = 1;
ha->global_use = global;
- ha->synced = 0;
+ ha->synced = sync;
list_add_tail_rcu(&ha->list, &list->list);
list->count++;
@@ -46,7 +47,7 @@ static int __hw_addr_create_ex(struct netdev_hw_addr_list *list,
static int __hw_addr_add_ex(struct netdev_hw_addr_list *list,
const unsigned char *addr, int addr_len,
- unsigned char addr_type, bool global)
+ unsigned char addr_type, bool global, bool sync)
{
struct netdev_hw_addr *ha;
@@ -63,43 +64,62 @@ static int __hw_addr_add_ex(struct netdev_hw_addr_list *list,
else
ha->global_use = true;
}
+ if (sync) {
+ if (ha->synced)
+ return 0;
+ else
+ ha->synced = true;
+ }
ha->refcount++;
return 0;
}
}
- return __hw_addr_create_ex(list, addr, addr_len, addr_type, global);
+ return __hw_addr_create_ex(list, addr, addr_len, addr_type, global,
+ sync);
}
static int __hw_addr_add(struct netdev_hw_addr_list *list,
const unsigned char *addr, int addr_len,
unsigned char addr_type)
{
- return __hw_addr_add_ex(list, addr, addr_len, addr_type, false);
+ return __hw_addr_add_ex(list, addr, addr_len, addr_type, false, false);
+}
+
+static int __hw_addr_del_entry(struct netdev_hw_addr_list *list,
+ struct netdev_hw_addr *ha, bool global,
+ bool sync)
+{
+ if (global && !ha->global_use)
+ return -ENOENT;
+
+ if (sync && !ha->synced)
+ return -ENOENT;
+
+ if (global)
+ ha->global_use = false;
+
+ if (sync)
+ ha->synced = false;
+
+ if (--ha->refcount)
+ return 0;
+ list_del_rcu(&ha->list);
+ kfree_rcu(ha, rcu_head);
+ list->count--;
+ return 0;
}
static int __hw_addr_del_ex(struct netdev_hw_addr_list *list,
const unsigned char *addr, int addr_len,
- unsigned char addr_type, bool global)
+ unsigned char addr_type, bool global, bool sync)
{
struct netdev_hw_addr *ha;
list_for_each_entry(ha, &list->list, list) {
if (!memcmp(ha->addr, addr, addr_len) &&
- (ha->type == addr_type || !addr_type)) {
- if (global) {
- if (!ha->global_use)
- break;
- else
- ha->global_use = false;
- }
- if (--ha->refcount)
- return 0;
- list_del_rcu(&ha->list);
- kfree_rcu(ha, rcu_head);
- list->count--;
- return 0;
- }
+ (ha->type == addr_type || !addr_type))
+ return __hw_addr_del_entry(list, ha, global, sync);
}
return -ENOENT;
}
@@ -108,7 +128,57 @@ static int __hw_addr_del(struct netdev_hw_addr_list *list,
const unsigned char *addr, int addr_len,
unsigned char addr_type)
{
- return __hw_addr_del_ex(list, addr, addr_len, addr_type, false);
+ return __hw_addr_del_ex(list, addr, addr_len, addr_type, false, false);
+}
+
+static int __hw_addr_sync_one(struct netdev_hw_addr_list *to_list,
+ struct netdev_hw_addr *ha,
+ int addr_len)
+{
+ int err;
+
+ err = __hw_addr_add_ex(to_list, ha->addr, addr_len, ha->type,
+ false, true);
+ if (err)
+ return err;
+ ha->sync_cnt++;
+ ha->refcount++;
+
+ return 0;
+}
+
+static void __hw_addr_unsync_one(struct netdev_hw_addr_list *to_list,
+ struct netdev_hw_addr_list *from_list,
+ struct netdev_hw_addr *ha,
+ int addr_len)
+{
+ int err;
+
+ err = __hw_addr_del_ex(to_list, ha->addr, addr_len, ha->type,
+ false, true);
+ if (err)
+ return;
+ ha->sync_cnt--;
+ __hw_addr_del_entry(from_list, ha, false, true);
+}
+
+static int __hw_addr_sync_multiple(struct netdev_hw_addr_list *to_list,
+ struct netdev_hw_addr_list *from_list,
+ int addr_len)
+{
+ int err = 0;
+ struct netdev_hw_addr *ha, *tmp;
+
+ list_for_each_entry_safe(ha, tmp, &from_list->list, list) {
+ if (ha->sync_cnt == ha->refcount) {
+ __hw_addr_unsync_one(to_list, from_list, ha, addr_len);
+ } else {
+ err = __hw_addr_sync_one(to_list, ha, addr_len);
+ if (err)
+ break;
+ }
+ }
+ return err;
}
int __hw_addr_add_multiple(struct netdev_hw_addr_list *to_list,
@@ -152,6 +222,11 @@ void __hw_addr_del_multiple(struct netdev_hw_addr_list *to_list,
}
EXPORT_SYMBOL(__hw_addr_del_multiple);
+/* This function only works where there is a strict 1-1 relationship
+ * between source and destionation of they synch. If you ever need to
+ * sync addresses to more then 1 destination, you need to use
+ * __hw_addr_sync_multiple().
+ */
int __hw_addr_sync(struct netdev_hw_addr_list *to_list,
struct netdev_hw_addr_list *from_list,
int addr_len)
@@ -160,17 +235,12 @@ int __hw_addr_sync(struct netdev_hw_addr_list *to_list,
struct netdev_hw_addr *ha, *tmp;
list_for_each_entry_safe(ha, tmp, &from_list->list, list) {
- if (!ha->synced) {
- err = __hw_addr_add(to_list, ha->addr,
- addr_len, ha->type);
+ if (!ha->sync_cnt) {
+ err = __hw_addr_sync_one(to_list, ha, addr_len);
if (err)
break;
- ha->synced++;
- ha->refcount++;
- } else if (ha->refcount == 1) {
- __hw_addr_del(to_list, ha->addr, addr_len, ha->type);
- __hw_addr_del(from_list, ha->addr, addr_len, ha->type);
- }
+ } else if (ha->refcount == 1)
+ __hw_addr_unsync_one(to_list, from_list, ha, addr_len);
}
return err;
}
@@ -183,13 +253,8 @@ void __hw_addr_unsync(struct netdev_hw_addr_list *to_list,
struct netdev_hw_addr *ha, *tmp;
list_for_each_entry_safe(ha, tmp, &from_list->list, list) {
- if (ha->synced) {
- __hw_addr_del(to_list, ha->addr,
- addr_len, ha->type);
- ha->synced--;
- __hw_addr_del(from_list, ha->addr,
- addr_len, ha->type);
- }
+ if (ha->sync_cnt)
+ __hw_addr_unsync_one(to_list, from_list, ha, addr_len);
}
}
EXPORT_SYMBOL(__hw_addr_unsync);
@@ -406,7 +471,7 @@ int dev_uc_add_excl(struct net_device *dev, const unsigned char *addr)
}
}
err = __hw_addr_create_ex(&dev->uc, addr, dev->addr_len,
- NETDEV_HW_ADDR_T_UNICAST, true);
+ NETDEV_HW_ADDR_T_UNICAST, true, false);
if (!err)
__dev_set_rx_mode(dev);
out:
@@ -469,7 +534,8 @@ EXPORT_SYMBOL(dev_uc_del);
* locked by netif_addr_lock_bh.
*
* This function is intended to be called from the dev->set_rx_mode
- * function of layered software devices.
+ * function of layered software devices. This function assumes that
+ * addresses will only ever be synced to the @to devices and no other.
*/
int dev_uc_sync(struct net_device *to, struct net_device *from)
{
@@ -488,6 +554,36 @@ int dev_uc_sync(struct net_device *to, struct net_device *from)
EXPORT_SYMBOL(dev_uc_sync);
/**
+ * dev_uc_sync_multiple - Synchronize device's unicast list to another
+ * device, but allow for multiple calls to sync to multiple devices.
+ * @to: destination device
+ * @from: source device
+ *
+ * Add newly added addresses to the destination device and release
+ * addresses that have been deleted from the source. The source device
+ * must be locked by netif_addr_lock_bh.
+ *
+ * This function is intended to be called from the dev->set_rx_mode
+ * function of layered software devices. It allows for a single source
+ * device to be synced to multiple destination devices.
+ */
+int dev_uc_sync_multiple(struct net_device *to, struct net_device *from)
+{
+ int err = 0;
+
+ if (to->addr_len != from->addr_len)
+ return -EINVAL;
+
+ netif_addr_lock_nested(to);
+ err = __hw_addr_sync_multiple(&to->uc, &from->uc, to->addr_len);
+ if (!err)
+ __dev_set_rx_mode(to);
+ netif_addr_unlock(to);
+ return err;
+}
+EXPORT_SYMBOL(dev_uc_sync_multiple);
+
+/**
* dev_uc_unsync - Remove synchronized addresses from the destination device
* @to: destination device
* @from: source device
@@ -559,7 +655,7 @@ int dev_mc_add_excl(struct net_device *dev, const unsigned char *addr)
}
}
err = __hw_addr_create_ex(&dev->mc, addr, dev->addr_len,
- NETDEV_HW_ADDR_T_MULTICAST, true);
+ NETDEV_HW_ADDR_T_MULTICAST, true, false);
if (!err)
__dev_set_rx_mode(dev);
out:
@@ -575,7 +671,7 @@ static int __dev_mc_add(struct net_device *dev, const unsigned char *addr,
netif_addr_lock_bh(dev);
err = __hw_addr_add_ex(&dev->mc, addr, dev->addr_len,
- NETDEV_HW_ADDR_T_MULTICAST, global);
+ NETDEV_HW_ADDR_T_MULTICAST, global, false);
if (!err)
__dev_set_rx_mode(dev);
netif_addr_unlock_bh(dev);
@@ -615,7 +711,7 @@ static int __dev_mc_del(struct net_device *dev, const unsigned char *addr,
netif_addr_lock_bh(dev);
err = __hw_addr_del_ex(&dev->mc, addr, dev->addr_len,
- NETDEV_HW_ADDR_T_MULTICAST, global);
+ NETDEV_HW_ADDR_T_MULTICAST, global, false);
if (!err)
__dev_set_rx_mode(dev);
netif_addr_unlock_bh(dev);
@@ -679,6 +775,36 @@ int dev_mc_sync(struct net_device *to, struct net_device *from)
EXPORT_SYMBOL(dev_mc_sync);
/**
+ * dev_mc_sync_multiple - Synchronize device's unicast list to another
+ * device, but allow for multiple calls to sync to multiple devices.
+ * @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_addr_lock_bh.
+ *
+ * This function is intended to be called from the ndo_set_rx_mode
+ * function of layered software devices. It allows for a single
+ * source device to be synced to multiple destination devices.
+ */
+int dev_mc_sync_multiple(struct net_device *to, struct net_device *from)
+{
+ int err = 0;
+
+ if (to->addr_len != from->addr_len)
+ return -EINVAL;
+
+ netif_addr_lock_nested(to);
+ err = __hw_addr_sync(&to->mc, &from->mc, to->addr_len);
+ if (!err)
+ __dev_set_rx_mode(to);
+ netif_addr_unlock(to);
+ return err;
+}
+EXPORT_SYMBOL(dev_mc_sync_multiple);
+
+/**
* dev_mc_unsync - Remove synchronized addresses from the destination device
* @to: destination device
* @from: source device
--
1.7.7.6
--
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