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>

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;