package/kernel/mac80211/patches/subsys/380-mac80211-introduce-aql_enable-node-in-debugfs.patch

   1 From: Lorenzo Bianconi <lorenzo@kernel.org>
   2 Date: Sat, 9 Jan 2021 18:57:51 +0100
   3 Subject: [PATCH] mac80211: introduce aql_enable node in debugfs
   4
   5 Introduce aql_enable node in debugfs in order to enable/disable aql.
   6 This is useful for debugging purpose.
   7
   8 Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
   9 Link: https://lore.kernel.org/r/e7a934d5d84e4796c4f97ea5de4e66c824296b07.1610214851.git.lorenzo@kernel.org
  10 Signed-off-by: Johannes Berg <johannes.berg@intel.com>
  11 ---
  12
  13 --- a/net/mac80211/debugfs.c
  14 +++ b/net/mac80211/debugfs.c
  15 @@ -281,6 +281,56 @@ static const struct file_operations aql_
  16         .llseek = default_llseek,
  17  };
  18
  19 +static ssize_t aql_enable_read(struct file *file, char __user *user_buf,
  20 +                              size_t count, loff_t *ppos)
  21 +{
  22 +       char buf[3];
  23 +       int len;
  24 +
  25 +       len = scnprintf(buf, sizeof(buf), "%d\n",
  26 +                       !static_key_false(&aql_disable.key));
  27 +
  28 +       return simple_read_from_buffer(user_buf, count, ppos, buf, len);
  29 +}
  30 +
  31 +static ssize_t aql_enable_write(struct file *file, const char __user *user_buf,
  32 +                               size_t count, loff_t *ppos)
  33 +{
  34 +       bool aql_disabled = static_key_false(&aql_disable.key);
  35 +       char buf[3];
  36 +       size_t len;
  37 +
  38 +       if (count > sizeof(buf))
  39 +               return -EINVAL;
  40 +
  41 +       if (copy_from_user(buf, user_buf, count))
  42 +               return -EFAULT;
  43 +
  44 +       buf[sizeof(buf) - 1] = '\0';
  45 +       len = strlen(buf);
  46 +       if (len > 0 && buf[len - 1] == '\n')
  47 +               buf[len - 1] = 0;
  48 +
  49 +       if (buf[0] == '0' && buf[1] == '\0') {
  50 +               if (!aql_disabled)
  51 +                       static_branch_inc(&aql_disable);
  52 +       } else if (buf[0] == '1' && buf[1] == '\0') {
  53 +               if (aql_disabled)
  54 +                       static_branch_dec(&aql_disable);
  55 +       } else {
  56 +               return -EINVAL;
  57 +       }
  58 +
  59 +       return count;
  60 +}
  61 +
  62 +static const struct file_operations aql_enable_ops = {
  63 +       .write = aql_enable_write,
  64 +       .read = aql_enable_read,
  65 +       .open = simple_open,
  66 +       .llseek = default_llseek,
  67 +};
  68 +
  69  static ssize_t force_tx_status_read(struct file *file,
  70                                     char __user *user_buf,
  71                                     size_t count,
  72 @@ -569,6 +619,7 @@ void debugfs_hw_add(struct ieee80211_loc
  73         DEBUGFS_ADD(power);
  74         DEBUGFS_ADD(hw_conf);
  75         DEBUGFS_ADD_MODE(force_tx_status, 0600);
  76 +       DEBUGFS_ADD_MODE(aql_enable, 0600);
  77
  78         if (local->ops->wake_tx_queue)
  79                 DEBUGFS_ADD_MODE(aqm, 0600);
  80 --- a/net/mac80211/ieee80211_i.h
  81 +++ b/net/mac80211/ieee80211_i.h
  82 @@ -1140,6 +1140,8 @@ enum mac80211_scan_state {
  83         SCAN_ABORT,
  84  };
  85
  86 +DECLARE_STATIC_KEY_FALSE(aql_disable);
  87 +
  88  struct ieee80211_local {
  89         /* embed the driver visible part.
  90          * don't cast (use the static inlines below), but we keep
  91 --- a/net/mac80211/tx.c
  92 +++ b/net/mac80211/tx.c
  93 @@ -3887,6 +3887,8 @@ void __ieee80211_schedule_txq(struct iee
  94  }
  95  EXPORT_SYMBOL(__ieee80211_schedule_txq);
  96
  97 +DEFINE_STATIC_KEY_FALSE(aql_disable);
  98 +
  99  bool ieee80211_txq_airtime_check(struct ieee80211_hw *hw,
 100                                  struct ieee80211_txq *txq)
 101  {
 102 @@ -3896,6 +3898,9 @@ bool ieee80211_txq_airtime_check(struct
 103         if (!wiphy_ext_feature_isset(local->hw.wiphy, NL80211_EXT_FEATURE_AQL))
 104                 return true;
 105
 106 +       if (static_branch_unlikely(&aql_disable))
 107 +               return true;
 108 +
 109         if (!txq->sta)
 110                 return true;
 111