package/kernel/mac80211/patches/559-ath9k-dynack-set-max-timeout-according-to-channel-wi.patch

   1 From 3f737abb7d53cc80d619a3b4a30b6fa63cdc8df7 Mon Sep 17 00:00:00 2001
   2 From: Lorenzo Bianconi <lorenzo@kernel.org>
   3 Date: Tue, 20 Aug 2019 18:20:21 +0200
   4 Subject: [PATCH 3/4] ath9k: dynack: set max timeout according to channel width
   5
   6 Compute maximum configurable ackimeout/ctstimeout according to channel
   7 width (clockrate)
   8
   9 Tested-by: Koen Vandeputte <koen.vandeputte@ncentric.com>
  10 Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
  11 ---
  12  drivers/net/wireless/ath/ath9k/dynack.c | 38 +++++++++++++++++++------
  13  1 file changed, 30 insertions(+), 8 deletions(-)
  14
  15 diff --git a/drivers/net/wireless/ath/ath9k/dynack.c b/drivers/net/wireless/ath/ath9k/dynack.c
  16 index 398ea872751f..fe9181533de3 100644
  17 --- a/drivers/net/wireless/ath/ath9k/dynack.c
  18 +++ b/drivers/net/wireless/ath/ath9k/dynack.c
  19 @@ -20,11 +20,30 @@
  20
  21  #define COMPUTE_TO             (5 * HZ)
  22  #define LATEACK_DELAY          (10 * HZ)
  23 -#define LATEACK_TO             256
  24 -#define MAX_DELAY              300
  25  #define EWMA_LEVEL             96
  26  #define EWMA_DIV               128
  27
  28 +/**
  29 + * ath_dynack_get_max_to - set max timeout according to channel width
  30 + * @ah: ath hw
  31 + *
  32 + */
  33 +static u32 ath_dynack_get_max_to(struct ath_hw *ah)
  34 +{
  35 +       const struct ath9k_channel *chan = ah->curchan;
  36 +
  37 +       if (!chan)
  38 +               return 300;
  39 +
  40 +       if (IS_CHAN_HT40(chan))
  41 +               return 300;
  42 +       if (IS_CHAN_HALF_RATE(chan))
  43 +               return 750;
  44 +       if (IS_CHAN_QUARTER_RATE(chan))
  45 +               return 1500;
  46 +       return 600;
  47 +}
  48 +
  49  /**
  50   * ath_dynack_ewma - EWMA (Exponentially Weighted Moving Average) calculation
  51   *
  52 @@ -126,15 +145,16 @@ static void ath_dynack_compute_ackto(struct ath_hw *ah)
  53   */
  54  static void ath_dynack_compute_to(struct ath_hw *ah)
  55  {
  56 -       u32 ackto, ack_ts;
  57 -       u8 *dst, *src;
  58 +       struct ath_dynack *da = &ah->dynack;
  59 +       u32 ackto, ack_ts, max_to;
  60         struct ieee80211_sta *sta;
  61 -       struct ath_node *an;
  62         struct ts_info *st_ts;
  63 -       struct ath_dynack *da = &ah->dynack;
  64 +       struct ath_node *an;
  65 +       u8 *dst, *src;
  66
  67         rcu_read_lock();
  68
  69 +       max_to = ath_dynack_get_max_to(ah);
  70         while (da->st_rbf.h_rb != da->st_rbf.t_rb &&
  71                da->ack_rbf.h_rb != da->ack_rbf.t_rb) {
  72                 ack_ts = da->ack_rbf.tstamp[da->ack_rbf.h_rb];
  73 @@ -150,7 +170,7 @@ static void ath_dynack_compute_to(struct ath_hw *ah)
  74                 if (ack_ts > st_ts->tstamp + st_ts->dur) {
  75                         ackto = ack_ts - st_ts->tstamp - st_ts->dur;
  76
  77 -                       if (ackto < MAX_DELAY) {
  78 +                       if (ackto < max_to) {
  79                                 sta = ieee80211_find_sta_by_ifaddr(ah->hw, dst,
  80                                                                    src);
  81                                 if (sta) {
  82 @@ -207,8 +227,10 @@ void ath_dynack_sample_tx_ts(struct ath_hw *ah, struct sk_buff *skb,
  83                 if (ieee80211_is_assoc_req(hdr->frame_control) ||
  84                     ieee80211_is_assoc_resp(hdr->frame_control) ||
  85                     ieee80211_is_auth(hdr->frame_control)) {
  86 +                       u32 max_to = ath_dynack_get_max_to(ah);
  87 +
  88                         ath_dbg(common, DYNACK, "late ack\n");
  89 -                       ath_dynack_set_timeout(ah, LATEACK_TO);
  90 +                       ath_dynack_set_timeout(ah, max_to);
  91                         if (sta) {
  92                                 struct ath_node *an;
  93
  94 --
  95 2.17.1
  96