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- From: Felix Fietkau <[email protected]>
- Date: Wed, 16 Jan 2019 21:47:54 +0100
- Subject: [PATCH] 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 <[email protected]>
- ---
- --- a/include/net/mac80211.h
- +++ b/include/net/mac80211.h
- @@ -2130,6 +2130,9 @@ struct ieee80211_txq {
- * @IEEE80211_HW_NEEDS_ALIGNED4_SKBS: Driver need aligned skbs to four-byte.
- * Padding will be added after ieee80211_hdr, before IV/LLC.
- *
- + * @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 {
- @@ -2176,6 +2179,7 @@ enum ieee80211_hw_flags {
- IEEE80211_HW_DEAUTH_NEED_MGD_TX_PREP,
- IEEE80211_HW_DOESNT_SUPPORT_QOS_NDP,
- IEEE80211_HW_NEEDS_ALIGNED4_SKBS,
- + IEEE80211_HW_TX_STATUS_NO_AMPDU_LEN,
-
- /* keep last, obviously */
- NUM_IEEE80211_HW_FLAGS
- --- a/net/mac80211/debugfs.c
- +++ b/net/mac80211/debugfs.c
- @@ -215,6 +215,7 @@ static const char *hw_flag_names[] = {
- FLAG(DEAUTH_NEED_MGD_TX_PREP),
- FLAG(DOESNT_SUPPORT_QOS_NDP),
- FLAG(NEEDS_ALIGNED4_SKBS),
- + FLAG(TX_STATUS_NO_AMPDU_LEN),
- #undef FLAG
- };
-
- --- a/net/mac80211/rc80211_minstrel_ht.c
- +++ b/net/mac80211/rc80211_minstrel_ht.c
- @@ -294,6 +294,15 @@ minstrel_get_ratestats(struct minstrel_h
- 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_h
- 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
- 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
- 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
- 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);
- --- a/net/mac80211/rc80211_minstrel_ht_debugfs.c
- +++ b/net/mac80211/rc80211_minstrel_ht_debugfs.c
- @@ -163,9 +163,10 @@ minstrel_ht_stats_open(struct inode *ino
- "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);
-
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