mt76: add API for testmode support

This can be used for calibration in the manufacturing process.
It supports sending a configurable number of packets with a specific rate
and configurable tx power levels / antenna settings.
It also supports receiving packets and showing some statistics, including
packet counters and detailed RSSI information.
It will only be compiled in if CONFIG_NL80211_TESTMODE is enabled

Signed-off-by: Felix Fietkau <nbd@nbd.name>

1 files changed, 497 insertions, 0 deletions

diff --git a/drivers/net/wireless/mediatek/mt76/testmode.c b/drivers/net/wireless/mediatek/mt76/testmode.c
new file mode 100644
index 000000000000..75bb02cdfdae
--- /dev/null
+++ b/drivers/net/wireless/mediatek/mt76/testmode.c
@@ -0,0 +1,497 @@
+// SPDX-License-Identifier: ISC
+/* Copyright (C) 2020 Felix Fietkau <nbd@nbd.name> */
+#include "mt76.h"
+
+static const struct nla_policy mt76_tm_policy[NUM_MT76_TM_ATTRS] = {
+	[MT76_TM_ATTR_RESET] = { .type = NLA_FLAG },
+	[MT76_TM_ATTR_STATE] = { .type = NLA_U8 },
+	[MT76_TM_ATTR_TX_COUNT] = { .type = NLA_U32 },
+	[MT76_TM_ATTR_TX_RATE_MODE] = { .type = NLA_U8 },
+	[MT76_TM_ATTR_TX_RATE_NSS] = { .type = NLA_U8 },
+	[MT76_TM_ATTR_TX_RATE_IDX] = { .type = NLA_U8 },
+	[MT76_TM_ATTR_TX_RATE_SGI] = { .type = NLA_U8 },
+	[MT76_TM_ATTR_TX_RATE_LDPC] = { .type = NLA_U8 },
+	[MT76_TM_ATTR_TX_ANTENNA] = { .type = NLA_U8 },
+	[MT76_TM_ATTR_TX_POWER_CONTROL] = { .type = NLA_U8 },
+	[MT76_TM_ATTR_TX_POWER] = { .type = NLA_NESTED },
+	[MT76_TM_ATTR_FREQ_OFFSET] = { .type = NLA_U32 },
+};
+
+void mt76_testmode_tx_pending(struct mt76_dev *dev)
+{
+	struct mt76_testmode_data *td = &dev->test;
+	struct mt76_wcid *wcid = &dev->global_wcid;
+	struct sk_buff *skb = td->tx_skb;
+	struct mt76_queue *q;
+	int qid;
+
+	if (!skb || !td->tx_pending)
+		return;
+
+	qid = skb_get_queue_mapping(skb);
+	q = dev->q_tx[qid].q;
+
+	spin_lock_bh(&q->lock);
+
+	while (td->tx_pending > 0 && q->queued < q->ndesc / 2) {
+		int ret;
+
+		ret = dev->queue_ops->tx_queue_skb(dev, qid, skb_get(skb), wcid, NULL);
+		if (ret < 0)
+			break;
+
+		td->tx_pending--;
+		td->tx_queued++;
+	}
+
+	dev->queue_ops->kick(dev, q);
+
+	spin_unlock_bh(&q->lock);
+}
+
+
+static int
+mt76_testmode_tx_init(struct mt76_dev *dev)
+{
+	struct mt76_testmode_data *td = &dev->test;
+	struct ieee80211_tx_info *info;
+	struct ieee80211_hdr *hdr;
+	struct sk_buff *skb;
+	u16 fc = IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA |
+		 IEEE80211_FCTL_FROMDS;
+	struct ieee80211_tx_rate *rate;
+	u8 max_nss = hweight8(dev->phy.antenna_mask);
+
+	if (td->tx_antenna_mask)
+		max_nss = min_t(u8, max_nss, hweight8(td->tx_antenna_mask));
+
+	skb = alloc_skb(td->tx_msdu_len, GFP_KERNEL);
+	if (!skb)
+		return -ENOMEM;
+
+	dev_kfree_skb(td->tx_skb);
+	td->tx_skb = skb;
+	hdr = __skb_put_zero(skb, td->tx_msdu_len);
+	hdr->frame_control = cpu_to_le16(fc);
+	memcpy(hdr->addr1, dev->macaddr, sizeof(dev->macaddr));
+	memcpy(hdr->addr2, dev->macaddr, sizeof(dev->macaddr));
+	memcpy(hdr->addr3, dev->macaddr, sizeof(dev->macaddr));
+
+	info = IEEE80211_SKB_CB(skb);
+	info->flags = IEEE80211_TX_CTL_INJECTED |
+		      IEEE80211_TX_CTL_NO_ACK |
+		      IEEE80211_TX_CTL_NO_PS_BUFFER;
+	rate = &info->control.rates[0];
+	rate->count = 1;
+	rate->idx = td->tx_rate_idx;
+
+	switch (td->tx_rate_mode) {
+	case MT76_TM_TX_MODE_CCK:
+		if (dev->phy.chandef.chan->band != NL80211_BAND_2GHZ)
+			return -EINVAL;
+
+		if (rate->idx > 4)
+			return -EINVAL;
+		break;
+	case MT76_TM_TX_MODE_OFDM:
+		if (dev->phy.chandef.chan->band != NL80211_BAND_2GHZ)
+			break;
+
+		if (rate->idx > 8)
+			return -EINVAL;
+
+		rate->idx += 4;
+		break;
+	case MT76_TM_TX_MODE_HT:
+		if (rate->idx > 8 * max_nss &&
+			!(rate->idx == 32 &&
+			  dev->phy.chandef.width >= NL80211_CHAN_WIDTH_40))
+			return -EINVAL;
+
+		rate->flags |= IEEE80211_TX_RC_MCS;
+		break;
+	case MT76_TM_TX_MODE_VHT:
+		if (rate->idx > 9)
+			return -EINVAL;
+
+		if (td->tx_rate_nss > max_nss)
+			return -EINVAL;
+
+		ieee80211_rate_set_vht(rate, td->tx_rate_idx, td->tx_rate_nss);
+		rate->flags |= IEEE80211_TX_RC_VHT_MCS;
+		break;
+	default:
+		break;
+	}
+
+	if (td->tx_rate_sgi)
+		rate->flags |= IEEE80211_TX_RC_SHORT_GI;
+
+	if (td->tx_rate_ldpc)
+		info->flags |= IEEE80211_TX_CTL_LDPC;
+
+	if (td->tx_rate_mode >= MT76_TM_TX_MODE_HT) {
+		switch (dev->phy.chandef.width) {
+		case NL80211_CHAN_WIDTH_40:
+			rate->flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
+			break;
+		case NL80211_CHAN_WIDTH_80:
+			rate->flags |= IEEE80211_TX_RC_80_MHZ_WIDTH;
+			break;
+		case NL80211_CHAN_WIDTH_80P80:
+		case NL80211_CHAN_WIDTH_160:
+			rate->flags |= IEEE80211_TX_RC_160_MHZ_WIDTH;
+			break;
+		default:
+			break;
+		}
+	}
+
+	skb_set_queue_mapping(skb, IEEE80211_AC_BE);
+
+	return 0;
+}
+
+static void
+mt76_testmode_tx_start(struct mt76_dev *dev)
+{
+	struct mt76_testmode_data *td = &dev->test;
+
+	td->tx_queued = 0;
+	td->tx_done = 0;
+	td->tx_pending = td->tx_count;
+	tasklet_schedule(&dev->tx_tasklet);
+}
+
+static void
+mt76_testmode_tx_stop(struct mt76_dev *dev)
+{
+	struct mt76_testmode_data *td = &dev->test;
+
+	tasklet_disable(&dev->tx_tasklet);
+
+	td->tx_pending = 0;
+
+	tasklet_enable(&dev->tx_tasklet);
+
+	wait_event_timeout(dev->tx_wait, td->tx_done == td->tx_queued, 10 * HZ);
+
+	dev_kfree_skb(td->tx_skb);
+	td->tx_skb = NULL;
+}
+
+static inline void
+mt76_testmode_param_set(struct mt76_testmode_data *td, u16 idx)
+{
+	td->param_set[idx / 32] |= BIT(idx % 32);
+}
+
+static inline bool
+mt76_testmode_param_present(struct mt76_testmode_data *td, u16 idx)
+{
+	return td->param_set[idx / 32] & BIT(idx % 32);
+}
+
+static void
+mt76_testmode_init_defaults(struct mt76_dev *dev)
+{
+	struct mt76_testmode_data *td = &dev->test;
+
+	if (td->tx_msdu_len > 0)
+		return;
+
+	td->tx_msdu_len = 1024;
+	td->tx_count = 1;
+	td->tx_rate_mode = MT76_TM_TX_MODE_OFDM;
+	td->tx_rate_nss = 1;
+}
+
+static int
+__mt76_testmode_set_state(struct mt76_dev *dev, enum mt76_testmode_state state)
+{
+	enum mt76_testmode_state prev_state = dev->test.state;
+	int err;
+
+	if (prev_state == MT76_TM_STATE_TX_FRAMES)
+		mt76_testmode_tx_stop(dev);
+
+	if (state == MT76_TM_STATE_TX_FRAMES) {
+		err = mt76_testmode_tx_init(dev);
+		if (err)
+			return err;
+	}
+
+	err = dev->test_ops->set_state(dev, state);
+	if (err) {
+		if (state == MT76_TM_STATE_TX_FRAMES)
+			mt76_testmode_tx_stop(dev);
+
+		return err;
+	}
+
+	if (state == MT76_TM_STATE_TX_FRAMES)
+		mt76_testmode_tx_start(dev);
+	else if (state == MT76_TM_STATE_RX_FRAMES) {
+		memset(&dev->test.rx_stats, 0, sizeof(dev->test.rx_stats));
+	}
+
+	dev->test.state = state;
+
+	return 0;
+}
+
+int mt76_testmode_set_state(struct mt76_dev *dev, enum mt76_testmode_state state)
+{
+	struct mt76_testmode_data *td = &dev->test;
+	struct ieee80211_hw *hw = dev->phy.hw;
+
+	if (state == td->state && state == MT76_TM_STATE_OFF)
+		return 0;
+
+	if (state > MT76_TM_STATE_OFF &&
+	    (!test_bit(MT76_STATE_RUNNING, &dev->phy.state) ||
+	     !(hw->conf.flags & IEEE80211_CONF_MONITOR)))
+		return -ENOTCONN;
+
+	if (state != MT76_TM_STATE_IDLE &&
+	    td->state != MT76_TM_STATE_IDLE) {
+		int ret;
+
+		ret = __mt76_testmode_set_state(dev, MT76_TM_STATE_IDLE);
+		if (ret)
+			return ret;
+	}
+
+	return __mt76_testmode_set_state(dev, state);
+
+}
+EXPORT_SYMBOL(mt76_testmode_set_state);
+
+static int
+mt76_tm_get_u8(struct nlattr *attr, u8 *dest, u8 min, u8 max)
+{
+	u8 val;
+
+	if (!attr)
+		return 0;
+
+	val = nla_get_u8(attr);
+	if (val < min || val > max)
+		return -EINVAL;
+
+	*dest = val;
+	return 0;
+}
+
+int mt76_testmode_cmd(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
+		      void *data, int len)
+{
+	struct mt76_phy *phy = hw->priv;
+	struct mt76_dev *dev = phy->dev;
+	struct mt76_testmode_data *td = &dev->test;
+	struct nlattr *tb[NUM_MT76_TM_ATTRS];
+	u32 state;
+	int err;
+	int i;
+
+	if (!dev->test_ops)
+		return -EOPNOTSUPP;
+
+	err = nla_parse_deprecated(tb, MT76_TM_ATTR_MAX, data, len,
+				   mt76_tm_policy, NULL);
+	if (err)
+		return err;
+
+	err = -EINVAL;
+
+	mutex_lock(&dev->mutex);
+
+	if (tb[MT76_TM_ATTR_RESET]) {
+		mt76_testmode_set_state(dev, MT76_TM_STATE_OFF);
+		memset(td, 0, sizeof(*td));
+	}
+
+	mt76_testmode_init_defaults(dev);
+
+	if (tb[MT76_TM_ATTR_TX_COUNT])
+		td->tx_count = nla_get_u32(tb[MT76_TM_ATTR_TX_COUNT]);
+
+	if (tb[MT76_TM_ATTR_TX_LENGTH]) {
+		u32 val = nla_get_u32(tb[MT76_TM_ATTR_TX_LENGTH]);
+
+		if (val > IEEE80211_MAX_FRAME_LEN ||
+		    val < sizeof(struct ieee80211_hdr))
+			goto out;
+
+		td->tx_msdu_len = val;
+	}
+
+	if (tb[MT76_TM_ATTR_TX_RATE_IDX])
+		td->tx_rate_idx = nla_get_u8(tb[MT76_TM_ATTR_TX_RATE_IDX]);
+
+	if (mt76_tm_get_u8(tb[MT76_TM_ATTR_TX_RATE_MODE], &td->tx_rate_mode,
+			   0, MT76_TM_TX_MODE_MAX) ||
+	    mt76_tm_get_u8(tb[MT76_TM_ATTR_TX_RATE_NSS], &td->tx_rate_nss,
+			   1, hweight8(phy->antenna_mask)) ||
+	    mt76_tm_get_u8(tb[MT76_TM_ATTR_TX_RATE_SGI], &td->tx_rate_sgi, 0, 1) ||
+	    mt76_tm_get_u8(tb[MT76_TM_ATTR_TX_RATE_LDPC], &td->tx_rate_ldpc, 0, 1) ||
+	    mt76_tm_get_u8(tb[MT76_TM_ATTR_TX_ANTENNA], &td->tx_antenna_mask, 1,
+			   phy->antenna_mask) ||
+	    mt76_tm_get_u8(tb[MT76_TM_ATTR_TX_POWER_CONTROL],
+			   &td->tx_power_control, 0, 1))
+		goto out;
+
+	if (tb[MT76_TM_ATTR_FREQ_OFFSET])
+		td->freq_offset = nla_get_u32(tb[MT76_TM_ATTR_FREQ_OFFSET]);
+
+	if (tb[MT76_TM_ATTR_STATE]) {
+		state = nla_get_u32(tb[MT76_TM_ATTR_STATE]);
+		if (state > MT76_TM_STATE_MAX)
+			goto out;
+	} else {
+		state = td->state;
+	}
+
+	if (tb[MT76_TM_ATTR_TX_POWER]) {
+		struct nlattr *cur;
+		int idx = 0;
+		int rem;
+
+		nla_for_each_nested(cur, tb[MT76_TM_ATTR_TX_POWER], rem) {
+			if (nla_len(cur) != 1 ||
+			    idx >= ARRAY_SIZE(td->tx_power))
+				goto out;
+
+			td->tx_power[idx++] = nla_get_u8(cur);
+		}
+	}
+
+	if (dev->test_ops->set_params) {
+		err = dev->test_ops->set_params(dev, tb, state);
+		if (err)
+			goto out;
+	}
+
+	for (i = MT76_TM_ATTR_STATE; i < ARRAY_SIZE(tb); i++)
+		if (tb[i])
+			mt76_testmode_param_set(td, i);
+
+	err = 0;
+	if (tb[MT76_TM_ATTR_STATE])
+		err = mt76_testmode_set_state(dev, state);
+
+out:
+	mutex_unlock(&dev->mutex);
+
+	return err;
+}
+EXPORT_SYMBOL(mt76_testmode_cmd);
+
+static int
+mt76_testmode_dump_stats(struct mt76_dev *dev, struct sk_buff *msg)
+{
+	struct mt76_testmode_data *td = &dev->test;
+	u64 rx_packets = 0;
+	u64 rx_fcs_error = 0;
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(td->rx_stats.packets); i++) {
+		rx_packets += td->rx_stats.packets[i];
+		rx_fcs_error += td->rx_stats.fcs_error[i];
+	}
+
+	if (nla_put_u32(msg, MT76_TM_STATS_ATTR_TX_PENDING, td->tx_pending) ||
+	    nla_put_u32(msg, MT76_TM_STATS_ATTR_TX_QUEUED, td->tx_queued) ||
+	    nla_put_u32(msg, MT76_TM_STATS_ATTR_TX_DONE, td->tx_done) ||
+	    nla_put_u64_64bit(msg, MT76_TM_STATS_ATTR_RX_PACKETS, rx_packets,
+			      MT76_TM_STATS_ATTR_PAD) ||
+	    nla_put_u64_64bit(msg, MT76_TM_STATS_ATTR_RX_FCS_ERROR, rx_fcs_error,
+			      MT76_TM_STATS_ATTR_PAD))
+		return -EMSGSIZE;
+
+	if (dev->test_ops->dump_stats)
+		return dev->test_ops->dump_stats(dev, msg);
+
+	return 0;
+}
+
+int mt76_testmode_dump(struct ieee80211_hw *hw, struct sk_buff *msg,
+		       struct netlink_callback *cb, void *data, int len)
+{
+	struct mt76_phy *phy = hw->priv;
+	struct mt76_dev *dev = phy->dev;
+	struct mt76_testmode_data *td = &dev->test;
+	struct nlattr *tb[NUM_MT76_TM_ATTRS] = {};
+	int err = 0;
+	void *a;
+	int i;
+
+	if (!dev->test_ops)
+		return -EOPNOTSUPP;
+
+	if (cb->args[2]++ > 0)
+		return -ENOENT;
+
+	if (data) {
+		err = nla_parse_deprecated(tb, MT76_TM_ATTR_MAX, data, len,
+					   mt76_tm_policy, NULL);
+		if (err)
+			return err;
+	}
+
+	mutex_lock(&dev->mutex);
+
+	if (tb[MT76_TM_ATTR_STATS]) {
+		a = nla_nest_start(msg, MT76_TM_ATTR_STATS);
+		err = mt76_testmode_dump_stats(dev, msg);
+		nla_nest_end(msg, a);
+
+		goto out;
+	}
+
+	mt76_testmode_init_defaults(dev);
+
+	err = -EMSGSIZE;
+	if (nla_put_u32(msg, MT76_TM_ATTR_STATE, td->state))
+		goto out;
+
+	if (td->mtd_name &&
+	    (nla_put_string(msg, MT76_TM_ATTR_MTD_PART, td->mtd_name) ||
+	     nla_put_u32(msg, MT76_TM_ATTR_MTD_OFFSET, td->mtd_offset)))
+		goto out;
+
+	if (nla_put_u32(msg, MT76_TM_ATTR_TX_COUNT, td->tx_count) ||
+	    nla_put_u32(msg, MT76_TM_ATTR_TX_LENGTH, td->tx_msdu_len) ||
+	    nla_put_u8(msg, MT76_TM_ATTR_TX_RATE_MODE, td->tx_rate_mode) ||
+	    nla_put_u8(msg, MT76_TM_ATTR_TX_RATE_NSS, td->tx_rate_nss) ||
+	    nla_put_u8(msg, MT76_TM_ATTR_TX_RATE_IDX, td->tx_rate_idx) ||
+	    nla_put_u8(msg, MT76_TM_ATTR_TX_RATE_SGI, td->tx_rate_sgi) ||
+	    nla_put_u8(msg, MT76_TM_ATTR_TX_RATE_LDPC, td->tx_rate_ldpc) ||
+	    (mt76_testmode_param_present(td, MT76_TM_ATTR_TX_ANTENNA) &&
+	     nla_put_u8(msg, MT76_TM_ATTR_TX_ANTENNA, td->tx_antenna_mask)) ||
+	    (mt76_testmode_param_present(td, MT76_TM_ATTR_TX_POWER_CONTROL) &&
+	     nla_put_u8(msg, MT76_TM_ATTR_TX_POWER_CONTROL, td->tx_power_control)) ||
+	    (mt76_testmode_param_present(td, MT76_TM_ATTR_FREQ_OFFSET) &&
+	     nla_put_u8(msg, MT76_TM_ATTR_FREQ_OFFSET, td->freq_offset)))
+		goto out;
+
+	if (mt76_testmode_param_present(td, MT76_TM_ATTR_TX_POWER)) {
+		a = nla_nest_start(msg, MT76_TM_ATTR_TX_POWER);
+		if (!a)
+			goto out;
+
+		for (i = 0; i < ARRAY_SIZE(td->tx_power); i++)
+			if (nla_put_u8(msg, i, td->tx_power[i]))
+				goto out;
+
+		nla_nest_end(msg, a);
+	}
+
+	err = 0;
+
+out:
+	mutex_unlock(&dev->mutex);
+
+	return err;
+}
+EXPORT_SYMBOL(mt76_testmode_dump);