Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next

Pull networking updates from David Miller:

 1) Support IPV6 RA Captive Portal Identifier, from Maciej Żenczykowski.

 2) Use bio_vec in the networking instead of custom skb_frag_t, from
    Matthew Wilcox.

 3) Make use of xmit_more in r8169 driver, from Heiner Kallweit.

 4) Add devmap_hash to xdp, from Toke Høiland-Jørgensen.

 5) Support all variants of 5750X bnxt_en chips, from Michael Chan.

 6) More RTNL avoidance work in the core and mlx5 driver, from Vlad
    Buslov.

 7) Add TCP syn cookies bpf helper, from Petar Penkov.

 8) Add 'nettest' to selftests and use it, from David Ahern.

 9) Add extack support to drop_monitor, add packet alert mode and
    support for HW drops, from Ido Schimmel.

10) Add VLAN offload to stmmac, from Jose Abreu.

11) Lots of devm_platform_ioremap_resource() conversions, from
    YueHaibing.

12) Add IONIC driver, from Shannon Nelson.

13) Several kTLS cleanups, from Jakub Kicinski.

* git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next: (1930 commits)
  mlxsw: spectrum_buffers: Add the ability to query the CPU port's shared buffer
  mlxsw: spectrum: Register CPU port with devlink
  mlxsw: spectrum_buffers: Prevent changing CPU port's configuration
  net: ena: fix incorrect update of intr_delay_resolution
  net: ena: fix retrieval of nonadaptive interrupt moderation intervals
  net: ena: fix update of interrupt moderation register
  net: ena: remove all old adaptive rx interrupt moderation code from ena_com
  net: ena: remove ena_restore_ethtool_params() and relevant fields
  net: ena: remove old adaptive interrupt moderation code from ena_netdev
  net: ena: remove code duplication in ena_com_update_nonadaptive_moderation_interval _*()
  net: ena: enable the interrupt_moderation in driver_supported_features
  net: ena: reimplement set/get_coalesce()
  net: ena: switch to dim algorithm for rx adaptive interrupt moderation
  net: ena: add intr_moder_rx_interval to struct ena_com_dev and use it
  net: phy: adin: implement Energy Detect Powerdown mode via phy-tunable
  ethtool: implement Energy Detect Powerdown support via phy-tunable
  xen-netfront: do not assume sk_buff_head list is empty in error handling
  s390/ctcm: Delete unnecessary checks before the macro call “dev_kfree_skb”
  net: ena: don't wake up tx queue when down
  drop_monitor: Better sanitize notified packets
  ...

1 files changed, 242 insertions, 35 deletions

diff --git a/net/mac80211/rc80211_minstrel_ht.c b/net/mac80211/rc80211_minstrel_ht.c
index 5a882da82f0e..0ef2633349b5 100644
--- a/net/mac80211/rc80211_minstrel_ht.c
+++ b/net/mac80211/rc80211_minstrel_ht.c
@@ -18,6 +18,8 @@
 #define AVG_AMPDU_SIZE	16
 #define AVG_PKT_SIZE	1200
 
+#define SAMPLE_SWITCH_THR	100
+
 /* Number of bits for an average sized packet */
 #define MCS_NBITS ((AVG_PKT_SIZE * AVG_AMPDU_SIZE) << 3)
 
@@ -58,6 +60,7 @@
 	[GROUP_IDX(_streams, _sgi, _ht40)] = {				\
 	.streams = _streams,						\
 	.shift = _s,							\
+	.bw = _ht40,							\
 	.flags =							\
 		IEEE80211_TX_RC_MCS |					\
 		(_sgi ? IEEE80211_TX_RC_SHORT_GI : 0) |			\
@@ -94,6 +97,7 @@
 	[VHT_GROUP_IDX(_streams, _sgi, _bw)] = {			\
 	.streams = _streams,						\
 	.shift = _s,							\
+	.bw = _bw,							\
 	.flags =							\
 		IEEE80211_TX_RC_VHT_MCS |				\
 		(_sgi ? IEEE80211_TX_RC_SHORT_GI : 0) |			\
@@ -486,7 +490,7 @@ minstrel_ht_assign_best_tp_rates(struct minstrel_ht_sta *mi,
 	tmp_prob = mi->groups[tmp_group].rates[tmp_idx].prob_ewma;
 	tmp_mcs_tp = minstrel_ht_get_tp_avg(mi, tmp_group, tmp_idx, tmp_prob);
 
-	if (tmp_cck_tp > tmp_mcs_tp) {
+	if (tmp_cck_tp_rate && tmp_cck_tp > tmp_mcs_tp) {
 		for(i = 0; i < MAX_THR_RATES; i++) {
 			minstrel_ht_sort_best_tp_rates(mi, tmp_cck_tp_rate[i],
 						       tmp_mcs_tp_rate);
@@ -526,6 +530,133 @@ minstrel_ht_prob_rate_reduce_streams(struct minstrel_ht_sta *mi)
 	}
 }
 
+static inline int
+minstrel_get_duration(int index)
+{
+	const struct mcs_group *group = &minstrel_mcs_groups[index / MCS_GROUP_RATES];
+	unsigned int duration = group->duration[index % MCS_GROUP_RATES];
+	return duration << group->shift;
+}
+
+static bool
+minstrel_ht_probe_group(struct minstrel_ht_sta *mi, const struct mcs_group *tp_group,
+						int tp_idx, const struct mcs_group *group)
+{
+	if (group->bw < tp_group->bw)
+		return false;
+
+	if (group->streams == tp_group->streams)
+		return true;
+
+	if (tp_idx < 4 && group->streams == tp_group->streams - 1)
+		return true;
+
+	return group->streams == tp_group->streams + 1;
+}
+
+static void
+minstrel_ht_find_probe_rates(struct minstrel_ht_sta *mi, u16 *rates, int *n_rates,
+			     bool faster_rate)
+{
+	const struct mcs_group *group, *tp_group;
+	int i, g, max_dur;
+	int tp_idx;
+
+	tp_group = &minstrel_mcs_groups[mi->max_tp_rate[0] / MCS_GROUP_RATES];
+	tp_idx = mi->max_tp_rate[0] % MCS_GROUP_RATES;
+
+	max_dur = minstrel_get_duration(mi->max_tp_rate[0]);
+	if (faster_rate)
+		max_dur -= max_dur / 16;
+
+	for (g = 0; g < MINSTREL_GROUPS_NB; g++) {
+		u16 supported = mi->supported[g];
+
+		if (!supported)
+			continue;
+
+		group = &minstrel_mcs_groups[g];
+		if (!minstrel_ht_probe_group(mi, tp_group, tp_idx, group))
+			continue;
+
+		for (i = 0; supported; supported >>= 1, i++) {
+			int idx;
+
+			if (!(supported & 1))
+				continue;
+
+			if ((group->duration[i] << group->shift) > max_dur)
+				continue;
+
+			idx = g * MCS_GROUP_RATES + i;
+			if (idx == mi->max_tp_rate[0])
+				continue;
+
+			rates[(*n_rates)++] = idx;
+			break;
+		}
+	}
+}
+
+static void
+minstrel_ht_rate_sample_switch(struct minstrel_priv *mp,
+			       struct minstrel_ht_sta *mi)
+{
+	struct minstrel_rate_stats *mrs;
+	u16 rates[MINSTREL_GROUPS_NB];
+	int n_rates = 0;
+	int probe_rate = 0;
+	bool faster_rate;
+	int i;
+	u8 random;
+
+	/*
+	 * Use rate switching instead of probing packets for devices with
+	 * little control over retry fallback behavior
+	 */
+	if (mp->hw->max_rates > 1)
+		return;
+
+	/*
+	 * If the current EWMA prob is >75%, look for a rate that's 6.25%
+	 * faster than the max tp rate.
+	 * If that fails, look again for a rate that is at least as fast
+	 */
+	mrs = minstrel_get_ratestats(mi, mi->max_tp_rate[0]);
+	faster_rate = mrs->prob_ewma > MINSTREL_FRAC(75, 100);
+	minstrel_ht_find_probe_rates(mi, rates, &n_rates, faster_rate);
+	if (!n_rates && faster_rate)
+		minstrel_ht_find_probe_rates(mi, rates, &n_rates, false);
+
+	/* If no suitable rate was found, try to pick the next one in the group */
+	if (!n_rates) {
+		int g_idx = mi->max_tp_rate[0] / MCS_GROUP_RATES;
+		u16 supported = mi->supported[g_idx];
+
+		supported >>= mi->max_tp_rate[0] % MCS_GROUP_RATES;
+		for (i = 0; supported; supported >>= 1, i++) {
+			if (!(supported & 1))
+				continue;
+
+			probe_rate = mi->max_tp_rate[0] + i;
+			goto out;
+		}
+
+		return;
+	}
+
+	i = 0;
+	if (n_rates > 1) {
+		random = prandom_u32();
+		i = random % n_rates;
+	}
+	probe_rate = rates[i];
+
+out:
+	mi->sample_rate = probe_rate;
+	mi->sample_mode = MINSTREL_SAMPLE_ACTIVE;
+}
+
 /*
  * Update rate statistics and select new primary rates
  *
@@ -536,7 +667,8 @@ minstrel_ht_prob_rate_reduce_streams(struct minstrel_ht_sta *mi)
  *    higher throughput rates, even if the probablity is a bit lower
  */
 static void
-minstrel_ht_update_stats(struct minstrel_priv *mp, struct minstrel_ht_sta *mi)
+minstrel_ht_update_stats(struct minstrel_priv *mp, struct minstrel_ht_sta *mi,
+			 bool sample)
 {
 	struct minstrel_mcs_group_data *mg;
 	struct minstrel_rate_stats *mrs;
@@ -544,6 +676,18 @@ minstrel_ht_update_stats(struct minstrel_priv *mp, struct minstrel_ht_sta *mi)
 	u16 tmp_mcs_tp_rate[MAX_THR_RATES], tmp_group_tp_rate[MAX_THR_RATES];
 	u16 tmp_cck_tp_rate[MAX_THR_RATES], index;
 
+	mi->sample_mode = MINSTREL_SAMPLE_IDLE;
+
+	if (sample) {
+		mi->total_packets_cur = mi->total_packets -
+					mi->total_packets_last;
+		mi->total_packets_last = mi->total_packets;
+	}
+	if (!mp->sample_switch)
+		sample = false;
+	if (mi->total_packets_cur < SAMPLE_SWITCH_THR && mp->sample_switch != 1)
+	    sample = false;
+
 	if (mi->ampdu_packets > 0) {
 		if (!ieee80211_hw_check(mp->hw, TX_STATUS_NO_AMPDU_LEN))
 			mi->avg_ampdu_len = minstrel_ewma(mi->avg_ampdu_len,
@@ -558,11 +702,19 @@ minstrel_ht_update_stats(struct minstrel_priv *mp, struct minstrel_ht_sta *mi)
 	mi->sample_slow = 0;
 	mi->sample_count = 0;
 
-	/* Initialize global rate indexes */
-	for(j = 0; j < MAX_THR_RATES; j++){
-		tmp_mcs_tp_rate[j] = 0;
-		tmp_cck_tp_rate[j] = 0;
-	}
+	memset(tmp_mcs_tp_rate, 0, sizeof(tmp_mcs_tp_rate));
+	memset(tmp_cck_tp_rate, 0, sizeof(tmp_cck_tp_rate));
+	if (mi->supported[MINSTREL_CCK_GROUP])
+		for (j = 0; j < ARRAY_SIZE(tmp_cck_tp_rate); j++)
+			tmp_cck_tp_rate[j] = MINSTREL_CCK_GROUP * MCS_GROUP_RATES;
+
+	if (mi->supported[MINSTREL_VHT_GROUP_0])
+		index = MINSTREL_VHT_GROUP_0 * MCS_GROUP_RATES;
+	else
+		index = MINSTREL_HT_GROUP_0 * MCS_GROUP_RATES;
+
+	for (j = 0; j < ARRAY_SIZE(tmp_mcs_tp_rate); j++)
+		tmp_mcs_tp_rate[j] = index;
 
 	/* Find best rate sets within all MCS groups*/
 	for (group = 0; group < ARRAY_SIZE(minstrel_mcs_groups); group++) {
@@ -575,7 +727,7 @@ minstrel_ht_update_stats(struct minstrel_priv *mp, struct minstrel_ht_sta *mi)
 
 		/* (re)Initialize group rate indexes */
 		for(j = 0; j < MAX_THR_RATES; j++)
-			tmp_group_tp_rate[j] = group;
+			tmp_group_tp_rate[j] = MCS_GROUP_RATES * group;
 
 		for (i = 0; i < MCS_GROUP_RATES; i++) {
 			if (!(mi->supported[group] & BIT(i)))
@@ -622,12 +774,16 @@ minstrel_ht_update_stats(struct minstrel_priv *mp, struct minstrel_ht_sta *mi)
 	/* try to sample all available rates during each interval */
 	mi->sample_count *= 8;
 
+	if (sample)
+		minstrel_ht_rate_sample_switch(mp, mi);
+
 #ifdef CONFIG_MAC80211_DEBUGFS
 	/* use fixed index if set */
 	if (mp->fixed_rate_idx != -1) {
 		for (i = 0; i < 4; i++)
 			mi->max_tp_rate[i] = mp->fixed_rate_idx;
 		mi->max_prob_rate = mp->fixed_rate_idx;
+		mi->sample_mode = MINSTREL_SAMPLE_IDLE;
 	}
 #endif
 
@@ -731,15 +887,17 @@ minstrel_ht_tx_status(void *priv, struct ieee80211_supported_band *sband,
 	struct minstrel_ht_sta_priv *msp = priv_sta;
 	struct minstrel_ht_sta *mi = &msp->ht;
 	struct ieee80211_tx_rate *ar = info->status.rates;
-	struct minstrel_rate_stats *rate, *rate2;
+	struct minstrel_rate_stats *rate, *rate2, *rate_sample = NULL;
 	struct minstrel_priv *mp = priv;
 	bool last, update = false;
+	bool sample_status = false;
 	int i;
 
 	if (!msp->is_ht)
 		return mac80211_minstrel.tx_status_ext(priv, sband,
 						       &msp->legacy, st);
 
+
 	/* This packet was aggregated but doesn't carry status info */
 	if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
 	    !(info->flags & IEEE80211_TX_STAT_AMPDU))
@@ -765,12 +923,17 @@ minstrel_ht_tx_status(void *priv, struct ieee80211_supported_band *sband,
 	if (info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE)
 		mi->sample_packets += info->status.ampdu_len;
 
+	if (mi->sample_mode != MINSTREL_SAMPLE_IDLE)
+		rate_sample = minstrel_get_ratestats(mi, mi->sample_rate);
+
 	last = !minstrel_ht_txstat_valid(mp, &ar[0]);
 	for (i = 0; !last; i++) {
 		last = (i == IEEE80211_TX_MAX_RATES - 1) ||
 		       !minstrel_ht_txstat_valid(mp, &ar[i + 1]);
 
 		rate = minstrel_ht_get_stats(mp, mi, &ar[i]);
+		if (rate == rate_sample)
+			sample_status = true;
 
 		if (last)
 			rate->success += info->status.ampdu_ack_len;
@@ -778,44 +941,60 @@ minstrel_ht_tx_status(void *priv, struct ieee80211_supported_band *sband,
 		rate->attempts += ar[i].count * info->status.ampdu_len;
 	}
 
-	/*
-	 * check for sudden death of spatial multiplexing,
-	 * downgrade to a lower number of streams if necessary.
-	 */
-	rate = minstrel_get_ratestats(mi, mi->max_tp_rate[0]);
-	if (rate->attempts > 30 &&
-	    MINSTREL_FRAC(rate->success, rate->attempts) <
-	    MINSTREL_FRAC(20, 100)) {
-		minstrel_downgrade_rate(mi, &mi->max_tp_rate[0], true);
+	switch (mi->sample_mode) {
+	case MINSTREL_SAMPLE_IDLE:
+		break;
+
+	case MINSTREL_SAMPLE_ACTIVE:
+		if (!sample_status)
+			break;
+
+		mi->sample_mode = MINSTREL_SAMPLE_PENDING;
 		update = true;
-	}
+		break;
+
+	case MINSTREL_SAMPLE_PENDING:
+		if (sample_status)
+			break;
 
-	rate2 = minstrel_get_ratestats(mi, mi->max_tp_rate[1]);
-	if (rate2->attempts > 30 &&
-	    MINSTREL_FRAC(rate2->success, rate2->attempts) <
-	    MINSTREL_FRAC(20, 100)) {
-		minstrel_downgrade_rate(mi, &mi->max_tp_rate[1], false);
 		update = true;
+		minstrel_ht_update_stats(mp, mi, false);
+		break;
+	}
+
+
+	if (mp->hw->max_rates > 1) {
+		/*
+		 * check for sudden death of spatial multiplexing,
+		 * downgrade to a lower number of streams if necessary.
+		 */
+		rate = minstrel_get_ratestats(mi, mi->max_tp_rate[0]);
+		if (rate->attempts > 30 &&
+		    MINSTREL_FRAC(rate->success, rate->attempts) <
+		    MINSTREL_FRAC(20, 100)) {
+			minstrel_downgrade_rate(mi, &mi->max_tp_rate[0], true);
+			update = true;
+		}
+
+		rate2 = minstrel_get_ratestats(mi, mi->max_tp_rate[1]);
+		if (rate2->attempts > 30 &&
+		    MINSTREL_FRAC(rate2->success, rate2->attempts) <
+		    MINSTREL_FRAC(20, 100)) {
+			minstrel_downgrade_rate(mi, &mi->max_tp_rate[1], false);
+			update = true;
+		}
 	}
 
 	if (time_after(jiffies, mi->last_stats_update +
 				(mp->update_interval / 2 * HZ) / 1000)) {
 		update = true;
-		minstrel_ht_update_stats(mp, mi);
+		minstrel_ht_update_stats(mp, mi, true);
 	}
 
 	if (update)
 		minstrel_ht_update_rates(mp, mi);
 }
 
-static inline int
-minstrel_get_duration(int index)
-{
-	const struct mcs_group *group = &minstrel_mcs_groups[index / MCS_GROUP_RATES];
-	unsigned int duration = group->duration[index % MCS_GROUP_RATES];
-	return duration << group->shift;
-}
-
 static void
 minstrel_calc_retransmit(struct minstrel_priv *mp, struct minstrel_ht_sta *mi,
                          int index)
@@ -980,14 +1159,18 @@ static void
 minstrel_ht_update_rates(struct minstrel_priv *mp, struct minstrel_ht_sta *mi)
 {
 	struct ieee80211_sta_rates *rates;
+	u16 first_rate = mi->max_tp_rate[0];
 	int i = 0;
 
+	if (mi->sample_mode == MINSTREL_SAMPLE_ACTIVE)
+		first_rate = mi->sample_rate;
+
 	rates = kzalloc(sizeof(*rates), GFP_ATOMIC);
 	if (!rates)
 		return;
 
 	/* Start with max_tp_rate[0] */
-	minstrel_ht_set_rate(mp, mi, rates, i++, mi->max_tp_rate[0]);
+	minstrel_ht_set_rate(mp, mi, rates, i++, first_rate);
 
 	if (mp->hw->max_rates >= 3) {
 		/* At least 3 tx rates supported, use max_tp_rate[1] next */
@@ -1012,6 +1195,11 @@ minstrel_get_sample_rate(struct minstrel_priv *mp, struct minstrel_ht_sta *mi)
 	int tp_rate1, tp_rate2;
 	int sample_idx = 0;
 
+	if (mp->hw->max_rates == 1 && mp->sample_switch &&
+	    (mi->total_packets_cur >= SAMPLE_SWITCH_THR ||
+	     mp->sample_switch == 1))
+		return -1;
+
 	if (mi->sample_wait > 0) {
 		mi->sample_wait--;
 		return -1;
@@ -1059,6 +1247,21 @@ minstrel_get_sample_rate(struct minstrel_priv *mp, struct minstrel_ht_sta *mi)
 	    minstrel_get_duration(mi->max_prob_rate) * 3 < sample_dur)
 		return -1;
 
+
+	/*
+	 * For devices with no configurable multi-rate retry, skip sampling
+	 * below the per-group max throughput rate, and only use one sampling
+	 * attempt per rate
+	 */
+	if (mp->hw->max_rates == 1 &&
+	    (minstrel_get_duration(mg->max_group_tp_rate[0]) < sample_dur ||
+	     mrs->attempts))
+		return -1;
+
+	/* Skip already sampled slow rates */
+	if (sample_dur >= minstrel_get_duration(tp_rate1) && mrs->attempts)
+		return -1;
+
 	/*
 	 * Make sure that lower rates get sampled only occasionally,
 	 * if the link is working perfectly.
@@ -1318,7 +1521,7 @@ minstrel_ht_update_caps(void *priv, struct ieee80211_supported_band *sband,
 	mi->supported[MINSTREL_CCK_GROUP] |= mi->cck_supported_short << 4;
 
 	/* create an initial rate table with the lowest supported rates */
-	minstrel_ht_update_stats(mp, mi);
+	minstrel_ht_update_stats(mp, mi, true);
 	minstrel_ht_update_rates(mp, mi);
 
 	return;
@@ -1436,6 +1639,8 @@ minstrel_ht_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
 	if (!mp)
 		return NULL;
 
+	mp->sample_switch = -1;
+
 	/* contention window settings
 	 * Just an approximation. Using the per-queue values would complicate
 	 * the calculations and is probably unnecessary */
@@ -1467,6 +1672,8 @@ minstrel_ht_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
 	mp->fixed_rate_idx = (u32) -1;
 	debugfs_create_u32("fixed_rate_idx", S_IRUGO | S_IWUGO, debugfsdir,
 			   &mp->fixed_rate_idx);
+	debugfs_create_u32("sample_switch", S_IRUGO | S_IWUSR, debugfsdir,
+			   &mp->sample_switch);
 #endif
 
 	minstrel_ht_init_cck_rates(mp);