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Date: Wed, 14 May 2014 16:37:27 -0700
From: Alexander Duyck <alexander.h.duyck@...el.com>
To: netdev@...r.kernel.org
Cc: jeffrey.t.kirsher@...el.com, davem@...emloft.net, jpirko@...hat.com
Subject: [RFC PATCH] net: Add support for device specific address syncing
This change provides a function to be used in order to break the
ndo_set_rx_mode call into a set of address add and remove calls. The code
is based on the implementation of dev_uc_sync/dev_mc_sync. Since they
essentially do the same thing but with only one dev I simply named my
functions __dev_uc_sync/__dev_mc_sync.
I also implemented an unsync version of the functions as well to allow for
cleanup on close.
Signed-off-by: Alexander Duyck <alexander.h.duyck@...el.com>
---
I still have to do some testing on this patch, but I am looking to see if
this is the correct approach or if the community would prefer I take a
different one.
include/linux/netdevice.h | 77 +++++++++++++++++++++++++++++++++++++++++++++
net/core/dev_addr_lists.c | 46 +++++++++++++++++++++++++++
2 files changed, 123 insertions(+), 0 deletions(-)
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index adc4658..d2dabf4 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -2998,6 +2998,13 @@ int __hw_addr_sync(struct netdev_hw_addr_list *to_list,
struct netdev_hw_addr_list *from_list, int addr_len);
void __hw_addr_unsync(struct netdev_hw_addr_list *to_list,
struct netdev_hw_addr_list *from_list, int addr_len);
+int __hw_addr_sync_dev(struct netdev_hw_addr_list *list,
+ struct net_device *dev,
+ int (*sync)(struct net_device *, const unsigned char *),
+ int (*unsync)(struct net_device *, const unsigned char *));
+void __hw_addr_unsync_dev(struct netdev_hw_addr_list *list,
+ struct net_device *dev,
+ int (*unsync)(struct net_device *, const unsigned char *));
void __hw_addr_init(struct netdev_hw_addr_list *list);
/* Functions used for device addresses handling */
@@ -3018,6 +3025,41 @@ void dev_uc_unsync(struct net_device *to, struct net_device *from);
void dev_uc_flush(struct net_device *dev);
void dev_uc_init(struct net_device *dev);
+/**
+ * __dev_uc_sync - Synchonize device's unicast list
+ * @dev: device to sync
+ * @sync: function to call if address should be added
+ * @unsync: function to call if address should be removed
+ *
+ * Add newly added addresses to the interface, and release
+ * addresses that have been deleted.
+ *
+ * This funciton is intended to be called from the ndo_set_rx_mode
+ * function of devices that require explicit address add/remove
+ * notifications.
+ **/
+static inline int __dev_uc_sync(struct net_device *dev,
+ int (*sync)(struct net_device *, const unsigned char *),
+ int (*unsync)(struct net_device *, const unsigned char *))
+{
+ return __hw_addr_sync_dev(&dev->uc, dev, sync, unsync);
+}
+
+/**
+ * __dev_uc_unsync - Remove synchonized addresses from device
+ * @dev: device to sync
+ * @unsync: function to call if address should be removed
+ *
+ * Remove all addresses that were added to the device by dev_uc_sync().
+ * This function is intended to be called from the ndo_stop function on devices
+ * that require explicit address add/remove notifications.
+ **/
+static inline void __dev_uc_unsync(struct net_device *dev,
+ int (*unsync)(struct net_device *, const unsigned char *))
+{
+ __hw_addr_unsync_dev(&dev->uc, dev, unsync);
+}
+
/* Functions used for multicast addresses handling */
int dev_mc_add(struct net_device *dev, const unsigned char *addr);
int dev_mc_add_global(struct net_device *dev, const unsigned char *addr);
@@ -3030,6 +3072,41 @@ void dev_mc_unsync(struct net_device *to, struct net_device *from);
void dev_mc_flush(struct net_device *dev);
void dev_mc_init(struct net_device *dev);
+/**
+ * __dev_mc_sync - Synchonize device's multicast list
+ * @dev: device to sync
+ * @sync: function to call if address should be added
+ * @unsync: function to call if address should be removed
+ *
+ * Add newly added addresses to the interface, and release
+ * addresses that have been deleted.
+ *
+ * This funciton is intended to be called from the ndo_set_rx_mode
+ * function of devices that require explicit address add/remove
+ * notifications.
+ **/
+static inline int __dev_mc_sync(struct net_device *dev,
+ int (*sync)(struct net_device *, const unsigned char *),
+ int (*unsync)(struct net_device *, const unsigned char *))
+{
+ return __hw_addr_sync_dev(&dev->mc, dev, sync, unsync);
+}
+
+/**
+ * __dev_mc_unsync - Remove synchonized addresses from device
+ * @dev: device to sync
+ * @unsync: function to call if address should be removed
+ *
+ * Remove all addresses that were added to the device by dev_mc_sync().
+ * This function is intended to be called from the ndo_stop function on devices
+ * that require explicit address add/remove notifications.
+ **/
+static inline void __dev_mc_unsync(struct net_device *dev,
+ int (*unsync)(struct net_device *, const unsigned char *))
+{
+ __hw_addr_unsync_dev(&dev->mc, dev, unsync);
+}
+
/* Functions used for secondary unicast and multicast support */
void dev_set_rx_mode(struct net_device *dev);
void __dev_set_rx_mode(struct net_device *dev);
diff --git a/net/core/dev_addr_lists.c b/net/core/dev_addr_lists.c
index 329d579..e6f0f55 100644
--- a/net/core/dev_addr_lists.c
+++ b/net/core/dev_addr_lists.c
@@ -225,6 +225,52 @@ void __hw_addr_unsync(struct netdev_hw_addr_list *to_list,
}
EXPORT_SYMBOL(__hw_addr_unsync);
+int __hw_addr_sync_dev(struct netdev_hw_addr_list *list,
+ struct net_device *dev,
+ int (*sync)(struct net_device *, const unsigned char *),
+ int (*unsync)(struct net_device *, const unsigned char *))
+{
+ struct netdev_hw_addr *ha, *tmp;
+ int err = 0;
+
+ list_for_each_entry_safe(ha, tmp, &list->list, list) {
+ if (!ha->sync_cnt) {
+ err = sync(dev, ha->addr);
+ if (err)
+ break;
+ ha->sync_cnt++;
+ ha->refcount++;
+ } else if (ha->refcount == 1) {
+ err = unsync(dev, ha->addr);
+ if (!err) {
+ ha->sync_cnt--;
+ __hw_addr_del_entry(list, ha, false, false);
+ }
+ }
+ }
+ return err;
+}
+EXPORT_SYMBOL(__hw_addr_sync_dev);
+
+void __hw_addr_unsync_dev(struct netdev_hw_addr_list *list,
+ struct net_device *dev,
+ int (*unsync)(struct net_device *, const unsigned char *))
+{
+ struct netdev_hw_addr *ha, *tmp;
+ int err;
+
+ list_for_each_entry_safe(ha, tmp, &list->list, list) {
+ if (!ha->sync_cnt)
+ continue;
+ err = unsync(dev, ha->addr);
+ if (!err) {
+ ha->sync_cnt--;
+ __hw_addr_del_entry(list, ha, false, false);
+ }
+ }
+}
+EXPORT_SYMBOL(__hw_addr_unsync_dev);
+
static void __hw_addr_flush(struct netdev_hw_addr_list *list)
{
struct netdev_hw_addr *ha, *tmp;
--
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