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authorFelix Fietkau <nbd@nbd.name>2019-01-16 22:32:12 +0100
committerJohannes Berg <johannes.berg@intel.com>2019-01-19 09:56:56 +0100
commit77f7ffdc335de8541a2a40618781ed0b76cee9f7 (patch)
treedfa578402b5831d3c5de1094295b02b216be334b
parenta8d418d9ac25f85a9caf652a4b2d07ec790474ab (diff)
mac80211: minstrel_ht: add flag to indicate missing/inaccurate tx A-MPDU length
Some hardware (e.g. MediaTek MT7603) cannot report A-MPDU length in tx status information. Add support for a flag to indicate that, to allow minstrel_ht to use a fixed value in its internal calculation (which gives better results than just defaulting to 1). Signed-off-by: Felix Fietkau <nbd@nbd.name> Signed-off-by: Johannes Berg <johannes.berg@intel.com>
-rw-r--r--include/net/mac80211.h4
-rw-r--r--net/mac80211/debugfs.c1
-rw-r--r--net/mac80211/rc80211_minstrel_ht.c25
-rw-r--r--net/mac80211/rc80211_minstrel_ht_debugfs.c7
4 files changed, 29 insertions, 8 deletions
diff --git a/include/net/mac80211.h b/include/net/mac80211.h
index 5d36eacf401e..a285c2bfd14e 100644
--- a/include/net/mac80211.h
+++ b/include/net/mac80211.h
@@ -2190,6 +2190,9 @@ struct ieee80211_txq {
* MMPDUs on station interfaces. This of course requires the driver to use
* TXQs to start with.
*
+ * @IEEE80211_HW_TX_STATUS_NO_AMPDU_LEN: Driver does not report accurate A-MPDU
+ * length in tx status information
+ *
* @NUM_IEEE80211_HW_FLAGS: number of hardware flags, used for sizing arrays
*/
enum ieee80211_hw_flags {
@@ -2238,6 +2241,7 @@ enum ieee80211_hw_flags {
IEEE80211_HW_BUFF_MMPDU_TXQ,
IEEE80211_HW_SUPPORTS_VHT_EXT_NSS_BW,
IEEE80211_HW_STA_MMPDU_TXQ,
+ IEEE80211_HW_TX_STATUS_NO_AMPDU_LEN,
/* keep last, obviously */
NUM_IEEE80211_HW_FLAGS
diff --git a/net/mac80211/debugfs.c b/net/mac80211/debugfs.c
index 81c5fec2eae7..343ad0a915e4 100644
--- a/net/mac80211/debugfs.c
+++ b/net/mac80211/debugfs.c
@@ -218,6 +218,7 @@ static const char *hw_flag_names[] = {
FLAG(BUFF_MMPDU_TXQ),
FLAG(SUPPORTS_VHT_EXT_NSS_BW),
FLAG(STA_MMPDU_TXQ),
+ FLAG(TX_STATUS_NO_AMPDU_LEN),
#undef FLAG
};
diff --git a/net/mac80211/rc80211_minstrel_ht.c b/net/mac80211/rc80211_minstrel_ht.c
index f466ec37d161..ccaf951e4e31 100644
--- a/net/mac80211/rc80211_minstrel_ht.c
+++ b/net/mac80211/rc80211_minstrel_ht.c
@@ -294,6 +294,15 @@ minstrel_get_ratestats(struct minstrel_ht_sta *mi, int index)
return &mi->groups[index / MCS_GROUP_RATES].rates[index % MCS_GROUP_RATES];
}
+static unsigned int
+minstrel_ht_avg_ampdu_len(struct minstrel_ht_sta *mi)
+{
+ if (!mi->avg_ampdu_len)
+ return AVG_AMPDU_SIZE;
+
+ return MINSTREL_TRUNC(mi->avg_ampdu_len);
+}
+
/*
* Return current throughput based on the average A-MPDU length, taking into
* account the expected number of retransmissions and their expected length
@@ -309,7 +318,7 @@ minstrel_ht_get_tp_avg(struct minstrel_ht_sta *mi, int group, int rate,
return 0;
if (group != MINSTREL_CCK_GROUP)
- nsecs = 1000 * mi->overhead / MINSTREL_TRUNC(mi->avg_ampdu_len);
+ nsecs = 1000 * mi->overhead / minstrel_ht_avg_ampdu_len(mi);
nsecs += minstrel_mcs_groups[group].duration[rate] <<
minstrel_mcs_groups[group].shift;
@@ -503,8 +512,12 @@ minstrel_ht_update_stats(struct minstrel_priv *mp, struct minstrel_ht_sta *mi)
u16 tmp_cck_tp_rate[MAX_THR_RATES], index;
if (mi->ampdu_packets > 0) {
- mi->avg_ampdu_len = minstrel_ewma(mi->avg_ampdu_len,
- MINSTREL_FRAC(mi->ampdu_len, mi->ampdu_packets), EWMA_LEVEL);
+ if (!ieee80211_hw_check(mp->hw, TX_STATUS_NO_AMPDU_LEN))
+ mi->avg_ampdu_len = minstrel_ewma(mi->avg_ampdu_len,
+ MINSTREL_FRAC(mi->ampdu_len, mi->ampdu_packets),
+ EWMA_LEVEL);
+ else
+ mi->avg_ampdu_len = 0;
mi->ampdu_len = 0;
mi->ampdu_packets = 0;
}
@@ -709,7 +722,9 @@ minstrel_ht_tx_status(void *priv, struct ieee80211_supported_band *sband,
mi->ampdu_len += info->status.ampdu_len;
if (!mi->sample_wait && !mi->sample_tries && mi->sample_count > 0) {
- mi->sample_wait = 16 + 2 * MINSTREL_TRUNC(mi->avg_ampdu_len);
+ int avg_ampdu_len = minstrel_ht_avg_ampdu_len(mi);
+
+ mi->sample_wait = 16 + 2 * avg_ampdu_len;
mi->sample_tries = 1;
mi->sample_count--;
}
@@ -777,7 +792,7 @@ minstrel_calc_retransmit(struct minstrel_priv *mp, struct minstrel_ht_sta *mi,
unsigned int cw = mp->cw_min;
unsigned int ctime = 0;
unsigned int t_slot = 9; /* FIXME */
- unsigned int ampdu_len = MINSTREL_TRUNC(mi->avg_ampdu_len);
+ unsigned int ampdu_len = minstrel_ht_avg_ampdu_len(mi);
unsigned int overhead = 0, overhead_rtscts = 0;
mrs = minstrel_get_ratestats(mi, index);
diff --git a/net/mac80211/rc80211_minstrel_ht_debugfs.c b/net/mac80211/rc80211_minstrel_ht_debugfs.c
index 57820a5f2c16..31641d0b0f5c 100644
--- a/net/mac80211/rc80211_minstrel_ht_debugfs.c
+++ b/net/mac80211/rc80211_minstrel_ht_debugfs.c
@@ -160,9 +160,10 @@ minstrel_ht_stats_open(struct inode *inode, struct file *file)
"lookaround %d\n",
max(0, (int) mi->total_packets - (int) mi->sample_packets),
mi->sample_packets);
- p += sprintf(p, "Average # of aggregated frames per A-MPDU: %d.%d\n",
- MINSTREL_TRUNC(mi->avg_ampdu_len),
- MINSTREL_TRUNC(mi->avg_ampdu_len * 10) % 10);
+ if (mi->avg_ampdu_len)
+ p += sprintf(p, "Average # of aggregated frames per A-MPDU: %d.%d\n",
+ MINSTREL_TRUNC(mi->avg_ampdu_len),
+ MINSTREL_TRUNC(mi->avg_ampdu_len * 10) % 10);
ms->len = p - ms->buf;
WARN_ON(ms->len + sizeof(*ms) > 32768);