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mac80211: add an intermediate software queue implementation

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This allows drivers to request per-vif and per-sta-tid queues from which
they can pull frames. This makes it easier to keep the hardware queues
short, and to improve fairness between clients and vifs.

The task of scheduling packet transmission is left up to the driver -
queueing is controlled by mac80211. Drivers can only dequeue packets by
calling ieee80211_tx_dequeue. This makes it possible to add active queue
management later without changing drivers using this code.

This can also be used as a starting point to implement A-MSDU
aggregation in a way that does not add artificially induced latency.

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
[resolved minor context conflict, minor changes, endian annotations]
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Felix Fietkau
2015-03-27 21:30:37 +01:00
committed by Johannes Berg
parent cef2fc1ce4
commit ba8c3d6f16
12 changed files with 433 additions and 19 deletions
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22
net/mac80211/util.c
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@@ -308,6 +308,11 @@ void ieee80211_propagate_queue_wake(struct ieee80211_local *local, int queue)
for (ac = 0; ac < n_acs; ac++) {
int ac_queue = sdata->vif.hw_queue[ac];
if (local->ops->wake_tx_queue &&
(atomic_read(&sdata->txqs_len[ac]) >
local->hw.txq_ac_max_pending))
continue;
if (ac_queue == queue ||
(sdata->vif.cab_queue == queue &&
local->queue_stop_reasons[ac_queue] == 0 &&
@@ -3352,3 +3357,20 @@ u8 *ieee80211_add_wmm_info_ie(u8 *buf, u8 qosinfo)
return buf;
}
void ieee80211_init_tx_queue(struct ieee80211_sub_if_data *sdata,
struct sta_info *sta,
struct txq_info *txqi, int tid)
{
skb_queue_head_init(&txqi->queue);
txqi->txq.vif = &sdata->vif;
if (sta) {
txqi->txq.sta = &sta->sta;
sta->sta.txq[tid] = &txqi->txq;
txqi->txq.ac = ieee802_1d_to_ac[tid & 7];
} else {
sdata->vif.txq = &txqi->txq;
txqi->txq.ac = IEEE80211_AC_BE;
}
}