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mac802154: correct max sifs size handling

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This patch fix the max sifs size correction when the
IEEE802154_HW_TX_OMIT_CKSUM flag is set. With this flag the sk_buff
doesn't contain the CRC, because the transceiver will add the CRC
while transmit.

Also add some defines for the max sifs frame size value and frame check
sequence according to 802.15.4 standard.

Signed-off-by: Alexander Aring <[email protected]>
Acked-by: Marc Kleine-Budde <[email protected]>
Signed-off-by: Marcel Holtmann <[email protected]>
This commit is contained in:
Alexander Aring 2015-03-04 21:19:59 +01:00 • committed by Marcel Holtmann
commit 3f3c4bb5ec
2 changed files with 14 additions and 1 deletions
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13
net/mac802154/util.c
View file

@ -65,8 +65,19 @@ void ieee802154_xmit_complete(struct ieee802154_hw *hw, struct sk_buff *skb,
{
if (ifs_handling) {
struct ieee802154_local *local = hw_to_local(hw);
u8 max_sifs_size;
if (skb->len > 18)
/* If transceiver sets CRC on his own we need to use lifs
* threshold len above 16 otherwise 18, because it's not
* part of skb->len.
*/
if (hw->flags & IEEE802154_HW_TX_OMIT_CKSUM)
max_sifs_size = IEEE802154_MAX_SIFS_FRAME_SIZE -
IEEE802154_FCS_LEN;
else
max_sifs_size = IEEE802154_MAX_SIFS_FRAME_SIZE;
if (skb->len > max_sifs_size)
hrtimer_start(&local->ifs_timer,
ktime_set(0, hw->phy->lifs_period * NSEC_PER_USEC),
HRTIMER_MODE_REL);