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authorAlexander Duyck <alexander.h.duyck@intel.com>2014-05-28 18:44:46 -0700
committerDavid S. Miller <davem@davemloft.net>2014-06-02 10:40:54 -0700
commit670e5b8eaf85704742bc3cb1df51fdd3ce08fc15 (patch)
treeb11726054cc9e4741d00666998c9010b59608f7b /net
parent3e820811583e7c7f8d7793775d82898e5136a855 (diff)
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@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/core/dev_addr_lists.c85
1 files changed, 85 insertions, 0 deletions
diff --git a/net/core/dev_addr_lists.c b/net/core/dev_addr_lists.c
index 329d5794e7dc..b6b230600b97 100644
--- a/net/core/dev_addr_lists.c
+++ b/net/core/dev_addr_lists.c
@@ -225,6 +225,91 @@ void __hw_addr_unsync(struct netdev_hw_addr_list *to_list,
}
EXPORT_SYMBOL(__hw_addr_unsync);
+/**
+ * __hw_addr_sync_dev - Synchonize device's multicast list
+ * @list: address list to syncronize
+ * @dev: device to sync
+ * @sync: function to call if address should be added
+ * @unsync: function to call if address should be removed
+ *
+ * This funciton is intended to be called from the ndo_set_rx_mode
+ * function of devices that require explicit address add/remove
+ * notifications. The unsync function may be NULL in which case
+ * the addresses requiring removal will simply be removed without
+ * any notification to the device.
+ **/
+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;
+
+ /* first go through and flush out any stale entries */
+ list_for_each_entry_safe(ha, tmp, &list->list, list) {
+ if (!ha->sync_cnt || ha->refcount != 1)
+ continue;
+
+ /* if unsync is defined and fails defer unsyncing address */
+ if (unsync && unsync(dev, ha->addr))
+ continue;
+
+ ha->sync_cnt--;
+ __hw_addr_del_entry(list, ha, false, false);
+ }
+
+ /* go through and sync new entries to the list */
+ list_for_each_entry_safe(ha, tmp, &list->list, list) {
+ if (ha->sync_cnt)
+ continue;
+
+ err = sync(dev, ha->addr);
+ if (err)
+ return err;
+
+ ha->sync_cnt++;
+ ha->refcount++;
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL(__hw_addr_sync_dev);
+
+/**
+ * __hw_addr_unsync_dev - Remove synchonized addresses from device
+ * @list: address list to remove syncronized addresses from
+ * @dev: device to sync
+ * @unsync: function to call if address should be removed
+ *
+ * Remove all addresses that were added to the device by __hw_addr_sync_dev().
+ * This function is intended to be called from the ndo_stop or ndo_open
+ * functions on devices that require explicit address add/remove
+ * notifications. If the unsync function pointer is NULL then this function
+ * can be used to just reset the sync_cnt for the addresses in the list.
+ **/
+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;
+
+ list_for_each_entry_safe(ha, tmp, &list->list, list) {
+ if (!ha->sync_cnt)
+ continue;
+
+ /* if unsync is defined and fails defer unsyncing address */
+ if (unsync && unsync(dev, ha->addr))
+ continue;
+
+ 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;