2013-12-16 20:39:54

by Felix Fietkau

Subject: [PATCH v2 3.13] mac80211: move "bufferable MMPDU" check to fix AP mode scan

The check needs to apply to both multicast and unicast packets,
otherwise probe requests on AP mode scans are sent through the multicast
buffer queue, which adds long delays (often longer than the scanning
interval).

Cc: [email protected]
Signed-off-by: Felix Fietkau <[email protected]>
---
net/mac80211/tx.c | 23 +++++++++++++----------
1 file changed, 13 insertions(+), 10 deletions(-)

diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c
index 002ded2..76d54ae 100644
--- a/net/mac80211/tx.c
+++ b/net/mac80211/tx.c
@@ -464,7 +464,6 @@ ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx)
{
struct sta_info *sta = tx->sta;
struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
- struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
struct ieee80211_local *local = tx->local;

if (unlikely(!sta))
@@ -475,15 +474,6 @@ ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx)
!(info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER))) {
int ac = skb_get_queue_mapping(tx->skb);

- /* only deauth, disassoc and action are bufferable MMPDUs */
- if (ieee80211_is_mgmt(hdr->frame_control) &&
- !ieee80211_is_deauth(hdr->frame_control) &&
- !ieee80211_is_disassoc(hdr->frame_control) &&
- !ieee80211_is_action(hdr->frame_control)) {
- info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER;
- return TX_CONTINUE;
- }
-
ps_dbg(sta->sdata, "STA %pM aid %d: PS buffer for AC %d\n",
sta->sta.addr, sta->sta.aid, ac);
if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
@@ -526,9 +516,22 @@ ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx)
static ieee80211_tx_result debug_noinline
ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx)
{
+ struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
+ struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
+
if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED))
return TX_CONTINUE;

+ /* only deauth, disassoc and action are bufferable MMPDUs */
+ if (ieee80211_is_mgmt(hdr->frame_control) &&
+ !ieee80211_is_deauth(hdr->frame_control) &&
+ !ieee80211_is_disassoc(hdr->frame_control) &&
+ !ieee80211_is_action(hdr->frame_control)) {
+ if (tx->flags & IEEE80211_TX_UNICAST)
+ info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER;
+ return TX_CONTINUE;
+ }
+
if (tx->flags & IEEE80211_TX_UNICAST)
return ieee80211_tx_h_unicast_ps_buf(tx);
else
--
1.8.3.4 (Apple Git-47)

2013-12-16 20:44:50

by Johannes Berg

Subject: Re: [PATCH v2 3.13] mac80211: move "bufferable MMPDU" check to fix AP mode scan

On Mon, 2013-12-16 at 21:39 +0100, Felix Fietkau wrote:
> The check needs to apply to both multicast and unicast packets,
> otherwise probe requests on AP mode scans are sent through the multicast
> buffer queue, which adds long delays (often longer than the scanning
> interval).

Applied.

johannes