From: Johannes Berg Date: Wed, 15 Jan 2020 11:25:50 +0000 (+0100) Subject: mac80211: use more bits for ack_frame_id X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=f2b18baca9539c6a3116d48b70972c7a2ba5d766;p=linux.git mac80211: use more bits for ack_frame_id It turns out that this wasn't a good idea, I hit a test failure in hwsim due to this. That particular failure was easily worked around, but it raised questions: if an AP needs to, for example, send action frames to each connected station, the current limit is nowhere near enough (especially if those stations are sleeping and the frames are queued for a while.) Shuffle around some bits to make more room for ack_frame_id to allow up to 8192 queued up frames, that's enough for queueing 4 frames to each connected station, even at the maximum of 2007 stations on a single AP. We take the bits from band (which currently only 2 but I leave 3 in case we add another band) and from the hw_queue, which can only need 4 since it has a limit of 16 queues. Fixes: 6912daed05e1 ("mac80211: Shrink the size of ack_frame_id to make room for tx_time_est") Signed-off-by: Johannes Berg Acked-by: Toke Høiland-Jørgensen Link: https://lore.kernel.org/r/20200115122549.b9a4ef9f4980.Ied52ed90150220b83a280009c590b65d125d087c@changeid Signed-off-by: Johannes Berg --- diff --git a/include/net/mac80211.h b/include/net/mac80211.h index aa145808e57a2..77e6b5a83b065 100644 --- a/include/net/mac80211.h +++ b/include/net/mac80211.h @@ -1004,12 +1004,11 @@ ieee80211_rate_get_vht_nss(const struct ieee80211_tx_rate *rate) struct ieee80211_tx_info { /* common information */ u32 flags; - u8 band; - - u8 hw_queue; - - u16 ack_frame_id:6; - u16 tx_time_est:10; + u32 band:3, + ack_frame_id:13, + hw_queue:4, + tx_time_est:10; + /* 2 free bits */ union { struct { diff --git a/net/mac80211/cfg.c b/net/mac80211/cfg.c index 000c742d05279..6aee699deb289 100644 --- a/net/mac80211/cfg.c +++ b/net/mac80211/cfg.c @@ -3450,7 +3450,7 @@ int ieee80211_attach_ack_skb(struct ieee80211_local *local, struct sk_buff *skb, spin_lock_irqsave(&local->ack_status_lock, spin_flags); id = idr_alloc(&local->ack_status_frames, ack_skb, - 1, 0x40, GFP_ATOMIC); + 1, 0x2000, GFP_ATOMIC); spin_unlock_irqrestore(&local->ack_status_lock, spin_flags); if (id < 0) { diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c index 4bd1faf4f779f..87def9cb91fff 100644 --- a/net/mac80211/tx.c +++ b/net/mac80211/tx.c @@ -2442,7 +2442,7 @@ static int ieee80211_store_ack_skb(struct ieee80211_local *local, spin_lock_irqsave(&local->ack_status_lock, flags); id = idr_alloc(&local->ack_status_frames, ack_skb, - 1, 0x40, GFP_ATOMIC); + 1, 0x2000, GFP_ATOMIC); spin_unlock_irqrestore(&local->ack_status_lock, flags); if (id >= 0) {