diff options
Diffstat (limited to 'net/mac802154/iface.c')
| -rw-r--r-- | net/mac802154/iface.c | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/net/mac802154/iface.c b/net/mac802154/iface.c index 3954bcff70e4..7079cd32a7ad 100644 --- a/net/mac802154/iface.c +++ b/net/mac802154/iface.c @@ -547,7 +547,17 @@ static void ieee802154_if_setup(struct net_device *dev) */ dev->needed_tailroom = IEEE802154_MAX_AUTH_TAG_LEN + IEEE802154_FCS_LEN; - dev->mtu = IEEE802154_MTU; + /* The mtu size is the payload without mac header in this case. + * We have a dynamic length header with a minimum header length + * which is hard_header_len. In this case we let mtu to the size + * of maximum payload which is IEEE802154_MTU - IEEE802154_FCS_LEN - + * hard_header_len. The FCS which is set by hardware or ndo_start_xmit + * and the minimum mac header which can be evaluated inside driver + * layer. The rest of mac header will be part of payload if greater + * than hard_header_len. + */ + dev->mtu = IEEE802154_MTU - IEEE802154_FCS_LEN - + dev->hard_header_len; dev->tx_queue_len = 300; dev->flags = IFF_NOARP | IFF_BROADCAST; } |