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| author | Alexander Aring <alex.aring@gmail.com> | 2015-09-28 13:36:26 +0300 |
|---|---|---|
| committer | Marcel Holtmann <marcel@holtmann.org> | 2015-09-30 14:21:32 +0300 |
| commit | b40988c438c2405a177ae54ff4baa08c720c296f (patch) | |
| tree | 255faa1cdb6a7398d61df143b563b42916998c69 /net/mac802154/iface.c | |
| parent | d58a2fa903c18f97aac30cd3c4c8a378a2c647c4 (diff) | |
| download | linux-b40988c438c2405a177ae54ff4baa08c720c296f.tar.xz | |
ieee802154: change mtu size behaviour
This patch changes the mtu size of 802.15.4 interfaces. The current
setting is the meaning of the maximum transport unit with mac header,
which is 127 bytes according 802.15.4. The linux meaning of the mtu size
field is the maximum payload of a mac frame. Like in ethernet, which is
1500 bytes.
We have dynamic length of mac frames in 802.15.4, this is why we assume
the minimum header length which is hard_header_len. This contains fc and
sequence fields. These can evaluated by driver layer without additional
checks. We currently don't support to set the FCS from userspace, so we
need to subtract this from mtu size as well.
Signed-off-by: Alexander Aring <alex.aring@gmail.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
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; } |