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mac80211: document TX aggregation (and small cleanup)

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Add documentation and move ieee80211_start_tx_ba_cb_irqsafe to right
after ieee80211_start_tx_ba_cb.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Johannes Berg 2009-02-10 21:25:49 +01:00 committed by John W. Linville
parent 955d3fe3e8
commit 86ab6c5a6c
1 changed files with 51 additions and 25 deletions
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76
net/mac80211/agg-tx.c
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@ -18,6 +18,31 @@
#include "ieee80211_i.h"
#include "wme.h"
/**
* DOC: TX aggregation
*
* Aggregation on the TX side requires setting the hardware flag
* %IEEE80211_HW_AMPDU_AGGREGATION as well as, if present, the @ampdu_queues
* hardware parameter to the number of hardware AMPDU queues. If there are no
* hardware queues then the driver will (currently) have to do all frame
* buffering.
*
* When TX aggregation is started by some subsystem (usually the rate control
* algorithm would be appropriate) by calling the
* ieee80211_start_tx_ba_session() function, the driver will be notified via
* its @ampdu_action function, with the %IEEE80211_AMPDU_TX_START action.
*
* In response to that, the driver is later required to call the
* ieee80211_start_tx_ba_cb() (or ieee80211_start_tx_ba_cb_irqsafe())
* function, which will start the aggregation session.
*
* Similarly, when the aggregation session is stopped by
* ieee80211_stop_tx_ba_session(), the driver's @ampdu_action function will
* be called with the action %IEEE80211_AMPDU_TX_STOP. In this case, the
* call must not fail, and the driver must later call ieee80211_stop_tx_ba_cb()
* (or ieee80211_stop_tx_ba_cb_irqsafe()).
*/
static void ieee80211_send_addba_request(struct ieee80211_sub_if_data *sdata,
const u8 *da, u16 tid,
u8 dialog_token, u16 start_seq_num,
@ -363,6 +388,31 @@ void ieee80211_start_tx_ba_cb(struct ieee80211_hw *hw, u8 *ra, u16 tid)
}
EXPORT_SYMBOL(ieee80211_start_tx_ba_cb);
void ieee80211_start_tx_ba_cb_irqsafe(struct ieee80211_hw *hw,
const u8 *ra, u16 tid)
{
struct ieee80211_local *local = hw_to_local(hw);
struct ieee80211_ra_tid *ra_tid;
struct sk_buff *skb = dev_alloc_skb(0);
if (unlikely(!skb)) {
#ifdef CONFIG_MAC80211_HT_DEBUG
if (net_ratelimit())
printk(KERN_WARNING "%s: Not enough memory, "
"dropping start BA session", skb->dev->name);
#endif
return;
}
ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
memcpy(&ra_tid->ra, ra, ETH_ALEN);
ra_tid->tid = tid;
skb->pkt_type = IEEE80211_ADDBA_MSG;
skb_queue_tail(&local->skb_queue, skb);
tasklet_schedule(&local->tasklet);
}
EXPORT_SYMBOL(ieee80211_start_tx_ba_cb_irqsafe);
int ieee80211_stop_tx_ba_session(struct ieee80211_hw *hw,
u8 *ra, u16 tid,
@ -492,31 +542,6 @@ void ieee80211_stop_tx_ba_cb(struct ieee80211_hw *hw, u8 *ra, u8 tid)
}
EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb);
void ieee80211_start_tx_ba_cb_irqsafe(struct ieee80211_hw *hw,
const u8 *ra, u16 tid)
{
struct ieee80211_local *local = hw_to_local(hw);
struct ieee80211_ra_tid *ra_tid;
struct sk_buff *skb = dev_alloc_skb(0);
if (unlikely(!skb)) {
#ifdef CONFIG_MAC80211_HT_DEBUG
if (net_ratelimit())
printk(KERN_WARNING "%s: Not enough memory, "
"dropping start BA session", skb->dev->name);
#endif
return;
}
ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
memcpy(&ra_tid->ra, ra, ETH_ALEN);
ra_tid->tid = tid;
skb->pkt_type = IEEE80211_ADDBA_MSG;
skb_queue_tail(&local->skb_queue, skb);
tasklet_schedule(&local->tasklet);
}
EXPORT_SYMBOL(ieee80211_start_tx_ba_cb_irqsafe);
void ieee80211_stop_tx_ba_cb_irqsafe(struct ieee80211_hw *hw,
const u8 *ra, u16 tid)
{
@ -542,6 +567,7 @@ void ieee80211_stop_tx_ba_cb_irqsafe(struct ieee80211_hw *hw,
}
EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb_irqsafe);
void ieee80211_process_addba_resp(struct ieee80211_local *local,
struct sta_info *sta,
struct ieee80211_mgmt *mgmt,