ieee80211_get_buffered_bc — accessing buffered broadcast and multicast frames
struct sk_buff * ieee80211_get_buffered_bc ( | struct ieee80211_hw * hw, |
struct ieee80211_vif * vif); |
hw
pointer as obtained from ieee80211_alloc_hw.
vifstruct ieee80211_vif pointer from the add_interface callback.
Function for accessing buffered broadcast and multicast frames. If hardware/firmware does not implement buffering of broadcast/multicast frames when power saving is used, 802.11 code buffers them in the host memory. The low-level driver uses this function to fetch next buffered frame. In most cases, this is used when generating beacon frame. This function returns a pointer to the next buffered skb or NULL if no more buffered frames are available.
buffered frames are returned only after DTIM beacon frame was
generated with ieee80211_beacon_get and the low-level driver must thus
call ieee80211_beacon_get first. ieee80211_get_buffered_bc returns
NULL if the previous generated beacon was not DTIM, so the low-level driver
does not need to check for DTIM beacons separately and should be able to
use common code for all beacons.