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author | Ivan Khoronzhuk <ivan.khoronzhuk@linaro.org> | 2018-11-08 23:27:54 +0300 |
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committer | David S. Miller <davem@davemloft.net> | 2018-11-09 07:30:57 +0300 |
commit | e7946760de5852f32c4e52ce47f37e85346981b9 (patch) | |
tree | 0d128b48eaede2259167293cf23c622e04b5e837 /net/core/dev_addr_lists.c | |
parent | 29e12207174a58ac8cab4914d0a7ce5e6c872646 (diff) | |
download | linux-e7946760de5852f32c4e52ce47f37e85346981b9.tar.xz |
net: core: dev_addr_lists: add auxiliary func to handle reference address updates
In order to avoid all table update, and only remove or add new
address, the auxiliary function exists, named __hw_addr_sync_dev().
It allows end driver do nothing when nothing changed and add/rm when
concrete address is firstly added or lastly removed. But it doesn't
include cases when an address of real device or vlan was reused by
other vlans or vlan/macval devices.
For handaling events when address was reused/unreused the patch adds
new auxiliary routine - __hw_addr_ref_sync_dev(). It allows to do
nothing when nothing was changed and do updates only for an address
being added/reused/deleted/unreused. Thus, clone address changes for
vlans can be mirrored in the table. The function is exclusive with
__hw_addr_sync_dev(). It's responsibility of the end driver to
identify address vlan device, if it needs so.
Signed-off-by: Ivan Khoronzhuk <ivan.khoronzhuk@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/core/dev_addr_lists.c')
-rw-r--r-- | net/core/dev_addr_lists.c | 97 |
1 files changed, 97 insertions, 0 deletions
diff --git a/net/core/dev_addr_lists.c b/net/core/dev_addr_lists.c index d884d8f5f0e5..81a8cd4ea3bd 100644 --- a/net/core/dev_addr_lists.c +++ b/net/core/dev_addr_lists.c @@ -278,6 +278,103 @@ int __hw_addr_sync_dev(struct netdev_hw_addr_list *list, EXPORT_SYMBOL(__hw_addr_sync_dev); /** + * __hw_addr_ref_sync_dev - Synchronize device's multicast address list taking + * into account references + * @list: address list to synchronize + * @dev: device to sync + * @sync: function to call if address or reference on it should be added + * @unsync: function to call if address or some reference on it should removed + * + * This function is intended to be called from the ndo_set_rx_mode + * function of devices that require explicit address or references on it + * add/remove notifications. The unsync function may be NULL in which case + * the addresses or references on it requiring removal will simply be + * removed without any notification to the device. That is responsibility of + * the driver to identify and distribute address or references on it between + * internal address tables. + **/ +int __hw_addr_ref_sync_dev(struct netdev_hw_addr_list *list, + struct net_device *dev, + int (*sync)(struct net_device *, + const unsigned char *, int), + int (*unsync)(struct net_device *, + const unsigned char *, int)) +{ + struct netdev_hw_addr *ha, *tmp; + int err, ref_cnt; + + /* first go through and flush out any unsynced/stale entries */ + list_for_each_entry_safe(ha, tmp, &list->list, list) { + /* sync if address is not used */ + if ((ha->sync_cnt << 1) <= ha->refcount) + continue; + + /* if fails defer unsyncing address */ + ref_cnt = ha->refcount - ha->sync_cnt; + if (unsync && unsync(dev, ha->addr, ref_cnt)) + continue; + + ha->refcount = (ref_cnt << 1) + 1; + ha->sync_cnt = ref_cnt; + __hw_addr_del_entry(list, ha, false, false); + } + + /* go through and sync updated/new entries to the list */ + list_for_each_entry_safe(ha, tmp, &list->list, list) { + /* sync if address added or reused */ + if ((ha->sync_cnt << 1) >= ha->refcount) + continue; + + ref_cnt = ha->refcount - ha->sync_cnt; + err = sync(dev, ha->addr, ref_cnt); + if (err) + return err; + + ha->refcount = ref_cnt << 1; + ha->sync_cnt = ref_cnt; + } + + return 0; +} +EXPORT_SYMBOL(__hw_addr_ref_sync_dev); + +/** + * __hw_addr_ref_unsync_dev - Remove synchronized addresses and references on + * it from device + * @list: address list to remove synchronized addresses (references on it) from + * @dev: device to sync + * @unsync: function to call if address and references on it should be removed + * + * Remove all addresses that were added to the device by + * __hw_addr_ref_sync_dev(). This function is intended to be called from the + * ndo_stop or ndo_open functions on devices that require explicit address (or + * references on it) 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_ref_unsync_dev(struct netdev_hw_addr_list *list, + struct net_device *dev, + int (*unsync)(struct net_device *, + const unsigned char *, int)) +{ + struct netdev_hw_addr *ha, *tmp; + + list_for_each_entry_safe(ha, tmp, &list->list, list) { + if (!ha->sync_cnt) + continue; + + /* if fails defer unsyncing address */ + if (unsync && unsync(dev, ha->addr, ha->sync_cnt)) + continue; + + ha->refcount -= ha->sync_cnt - 1; + ha->sync_cnt = 0; + __hw_addr_del_entry(list, ha, false, false); + } +} +EXPORT_SYMBOL(__hw_addr_ref_unsync_dev); + +/** * __hw_addr_unsync_dev - Remove synchronized addresses from device * @list: address list to remove synchronized addresses from * @dev: device to sync |