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| author | Michal Kazior <michal.kazior@tieto.com> | 2016-01-25 14:43:24 +0100 |
|---|---|---|
| committer | Jiri Slaby <jslaby@suse.cz> | 2016-04-20 08:46:47 +0200 |
| commit | a566941a4a3d88ec8235f7cc56902558d40e7042 (patch) | |
| tree | 531ce7508425d6e054318be2d6daa8e48984c322 /net | |
| parent | bc2d8a1f629272916b402b40d54bd3ac4c0c6595 (diff) | |
| download | lwn-a566941a4a3d88ec8235f7cc56902558d40e7042.tar.gz lwn-a566941a4a3d88ec8235f7cc56902558d40e7042.zip | |
mac80211: fix unnecessary frame drops in mesh fwding
commit cf44012810ccdd8fd947518e965cb04b7b8498be upstream.
The ieee80211_queue_stopped() expects hw queue
number but it was given raw WMM AC number instead.
This could cause frame drops and problems with
traffic in some cases - most notably if driver
doesn't map AC numbers to queue numbers 1:1 and
uses ieee80211_stop_queues() and
ieee80211_wake_queue() only without ever calling
ieee80211_wake_queues().
On ath10k it was possible to hit this problem in
the following case:
1. wlan0 uses queue 0
(ath10k maps queues per vif)
2. offchannel uses queue 15
3. queues 1-14 are unused
4. ieee80211_stop_queues()
5. ieee80211_wake_queue(q=0)
6. ieee80211_wake_queue(q=15)
(other queues are not woken up because both
driver and mac80211 know other queues are
unused)
7. ieee80211_rx_h_mesh_fwding()
8. ieee80211_select_queue_80211() returns 2
9. ieee80211_queue_stopped(q=2) returns true
10. frame is dropped (oops!)
Fixes: d3c1597b8d1b ("mac80211: fix forwarded mesh frame queue mapping")
Signed-off-by: Michal Kazior <michal.kazior@tieto.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Diffstat (limited to 'net')
| -rw-r--r-- | net/mac80211/rx.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c index 198fd6e1f6d4..834a41830778 100644 --- a/net/mac80211/rx.c +++ b/net/mac80211/rx.c @@ -2058,7 +2058,7 @@ ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx) struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; __le16 reason = cpu_to_le16(WLAN_REASON_MESH_PATH_NOFORWARD); - u16 q, hdrlen; + u16 ac, q, hdrlen; hdr = (struct ieee80211_hdr *) skb->data; hdrlen = ieee80211_hdrlen(hdr->frame_control); @@ -2128,7 +2128,8 @@ ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx) ether_addr_equal(sdata->vif.addr, hdr->addr3)) return RX_CONTINUE; - q = ieee80211_select_queue_80211(sdata, skb, hdr); + ac = ieee80211_select_queue_80211(sdata, skb, hdr); + q = sdata->vif.hw_queue[ac]; if (ieee80211_queue_stopped(&local->hw, q)) { IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion); return RX_DROP_MONITOR; |