STRUCT IEEE80211_TX_(9) The basic mac80211 driver inte STRUCT IEEE80211_TX_(9)NAMEstruct_ieee80211_tx_rate - rate selection/status
SYNOPSIS
struct ieee80211_tx_rate {
s8 idx;
u16 count:5;
u16 flags:11;
};
MEMBERS
idx
rate index to attempt to send with
count
number of tries in this rate before going to the next rate
flags
rate control flags (enum mac80211_rate_control_flags)
DESCRIPTION
A value of -1 for idx indicates an invalid rate and, if used in an
array of retry rates, that no more rates should be tried.
When used for transmit status reporting, the driver should always
report the rate along with the flags it used.
struct ieee80211_tx_info contains an array of these structs in the
control information, and it will be filled by the rate control
algorithm according to what should be sent. For example, if this array
contains, in the format { <idx>, <count> } the information { 3, 2 }, {
2, 2 }, { 1, 4 }, { -1, 0 }, { -1, 0 } then this means that the frame
should be transmitted up to twice at rate 3, up to twice at rate 2, and
up to four times at rate 1 if it doesn't get acknowledged. Say it gets
acknowledged by the peer after the fifth attempt, the status
information should then contain { 3, 2 }, { 2, 2 }, { 1, 1 }, { -1, 0 }
... since it was transmitted twice at rate 3, twice at rate 2 and once
at rate 1 after which we received an acknowledgement.
AUTHOR
Johannes Berg <johannes@sipsolutions.net>
Author.
COPYRIGHTKernel Hackers Manual 3.11 November 2013 STRUCT IEEE80211_TX_(9)
