68886f3018
Improves airtime fairness, especially for devices with larger firmware buffers
Signed-off-by: Felix Fietkau <nbd@nbd.name>
(cherry-picked from commit a5888ad6b3)
112 lines
2.9 KiB
Diff
112 lines
2.9 KiB
Diff
From: Lorenzo Bianconi <lorenzo@kernel.org>
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Date: Sat, 9 Jan 2021 18:57:51 +0100
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Subject: [PATCH] mac80211: introduce aql_enable node in debugfs
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Introduce aql_enable node in debugfs in order to enable/disable aql.
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This is useful for debugging purpose.
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Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
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Link: https://lore.kernel.org/r/e7a934d5d84e4796c4f97ea5de4e66c824296b07.1610214851.git.lorenzo@kernel.org
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Signed-off-by: Johannes Berg <johannes.berg@intel.com>
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---
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--- a/net/mac80211/debugfs.c
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+++ b/net/mac80211/debugfs.c
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@@ -281,6 +281,56 @@ static const struct file_operations aql_
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.llseek = default_llseek,
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};
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+static ssize_t aql_enable_read(struct file *file, char __user *user_buf,
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+ size_t count, loff_t *ppos)
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+{
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+ char buf[3];
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+ int len;
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+
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+ len = scnprintf(buf, sizeof(buf), "%d\n",
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+ !static_key_false(&aql_disable.key));
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+
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+ return simple_read_from_buffer(user_buf, count, ppos, buf, len);
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+}
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+
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+static ssize_t aql_enable_write(struct file *file, const char __user *user_buf,
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+ size_t count, loff_t *ppos)
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+{
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+ bool aql_disabled = static_key_false(&aql_disable.key);
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+ char buf[3];
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+ size_t len;
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+
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+ if (count > sizeof(buf))
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+ return -EINVAL;
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+
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+ if (copy_from_user(buf, user_buf, count))
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+ return -EFAULT;
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+
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+ buf[sizeof(buf) - 1] = '\0';
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+ len = strlen(buf);
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+ if (len > 0 && buf[len - 1] == '\n')
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+ buf[len - 1] = 0;
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+
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+ if (buf[0] == '0' && buf[1] == '\0') {
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+ if (!aql_disabled)
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+ static_branch_inc(&aql_disable);
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+ } else if (buf[0] == '1' && buf[1] == '\0') {
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+ if (aql_disabled)
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+ static_branch_dec(&aql_disable);
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+ } else {
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+ return -EINVAL;
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+ }
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+
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+ return count;
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+}
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+
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+static const struct file_operations aql_enable_ops = {
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+ .write = aql_enable_write,
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+ .read = aql_enable_read,
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+ .open = simple_open,
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+ .llseek = default_llseek,
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+};
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+
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static ssize_t force_tx_status_read(struct file *file,
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char __user *user_buf,
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size_t count,
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@@ -569,6 +619,7 @@ void debugfs_hw_add(struct ieee80211_loc
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DEBUGFS_ADD(power);
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DEBUGFS_ADD(hw_conf);
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DEBUGFS_ADD_MODE(force_tx_status, 0600);
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+ DEBUGFS_ADD_MODE(aql_enable, 0600);
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if (local->ops->wake_tx_queue)
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DEBUGFS_ADD_MODE(aqm, 0600);
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--- a/net/mac80211/ieee80211_i.h
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+++ b/net/mac80211/ieee80211_i.h
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@@ -1140,6 +1140,8 @@ enum mac80211_scan_state {
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SCAN_ABORT,
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};
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+DECLARE_STATIC_KEY_FALSE(aql_disable);
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+
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struct ieee80211_local {
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/* embed the driver visible part.
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* don't cast (use the static inlines below), but we keep
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--- a/net/mac80211/tx.c
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+++ b/net/mac80211/tx.c
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@@ -3909,6 +3909,8 @@ void __ieee80211_schedule_txq(struct iee
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}
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EXPORT_SYMBOL(__ieee80211_schedule_txq);
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+DEFINE_STATIC_KEY_FALSE(aql_disable);
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+
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bool ieee80211_txq_airtime_check(struct ieee80211_hw *hw,
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struct ieee80211_txq *txq)
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{
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@@ -3918,6 +3920,9 @@ bool ieee80211_txq_airtime_check(struct
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if (!wiphy_ext_feature_isset(local->hw.wiphy, NL80211_EXT_FEATURE_AQL))
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return true;
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+ if (static_branch_unlikely(&aql_disable))
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+ return true;
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+
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if (!txq->sta)
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return true;
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