'\" t
.\"     Title: ieee80211_get_buffered_bc
.\"    Author: 
.\" Generator: DocBook XSL Stylesheets v1.79.1 <http://docbook.sf.net/>
.\"      Date: January 2017
.\"    Manual: Advanced driver interface
.\"    Source: Kernel Hackers Manual 4.8.15
.\"  Language: English
.\"
.TH "IEEE80211_GET_BUFFER" "9" "January 2017" "Kernel Hackers Manual 4\&.8\&." "Advanced driver interface"
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.SH "NAME"
ieee80211_get_buffered_bc \- accessing buffered broadcast and multicast frames
.SH "SYNOPSIS"
.HP \w'struct\ sk_buff\ *\ ieee80211_get_buffered_bc('u
.BI "struct sk_buff * ieee80211_get_buffered_bc(struct\ ieee80211_hw\ *\ " "hw" ", struct\ ieee80211_vif\ *\ " "vif" ");"
.SH "ARGUMENTS"
.PP
\fIhw\fR
.RS 4
pointer as obtained from
\fBieee80211_alloc_hw\fR\&.
.RE
.PP
\fIvif\fR
.RS 4
struct ieee80211_vif
pointer from the add_interface callback\&.
.RE
.SH "DESCRIPTION"
.PP
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\&.
.SH "RETURN"
.PP
A pointer to the next buffered skb or NULL if no more buffered frames are available\&.
.SH "NOTE"
.PP
buffered frames are returned only after DTIM beacon frame was generated with
\fBieee80211_beacon_get\fR
and the low\-level driver must thus call
\fBieee80211_beacon_get\fR
first\&.
\fBieee80211_get_buffered_bc\fR
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\&.
.SH "AUTHOR"
.PP
\fBJohannes Berg\fR <\&johannes@sipsolutions.net\&>
.RS 4
Author.
.RE
.SH "COPYRIGHT"
.br