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mt76: mt7915: add 802.11 encap offload support
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It is currently limited to 3-address mode AP and STA interfaces

Signed-off-by: Felix Fietkau <nbd@nbd.name>
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@nbd168
nbd168 committed Aug 22, 2020
1 parent 888990e commit 3a3306e
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Showing 6 changed files with 182 additions and 83 deletions.
1 change: 1 addition & 0 deletions mt7915/init.c
View file
Expand Up @@ -261,6 +261,7 @@ mt7915_init_wiphy(struct ieee80211_hw *hw)
wiphy_ext_feature_set(wiphy, NL80211_EXT_FEATURE_VHT_IBSS);

ieee80211_hw_set(hw, HAS_RATE_CONTROL);
ieee80211_hw_set(hw, SUPPORTS_TX_ENCAP_OFFLOAD);

hw->max_tx_fragments = 4;
}
Expand Down
233 changes: 150 additions & 83 deletions mt7915/mac.c
View file
Expand Up @@ -567,21 +567,137 @@ int mt7915_mac_fill_rx(struct mt7915_dev *dev, struct sk_buff *skb)
return 0;
}

static void
mt7915_mac_write_txwi_8023(struct mt7915_dev *dev, __le32 *txwi,
struct sk_buff *skb, struct mt76_wcid *wcid)
{

u8 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK;
struct ethhdr *ehdr = (struct ethhdr *)skb->data;
bool multicast = is_multicast_ether_addr(ehdr->h_dest);
u8 fc_type, fc_stype;
bool wmm = false;
u32 val;

if (wcid->sta) {
struct ieee80211_sta *sta;

sta = container_of((void *)wcid, struct ieee80211_sta, drv_priv);
wmm = sta->wme;
}

val = FIELD_PREP(MT_TXD1_HDR_FORMAT, MT_HDR_FORMAT_802_3) |
FIELD_PREP(MT_TXD1_TID, tid);

if (be16_to_cpu(ehdr->h_proto) >= ETH_P_802_3_MIN)
val |= MT_TXD1_ETH_802_3;

txwi[1] |= cpu_to_le32(val);

fc_type = IEEE80211_FTYPE_DATA >> 2;
fc_stype = wmm ? IEEE80211_STYPE_QOS_DATA >> 4 : 0;

val = FIELD_PREP(MT_TXD2_FRAME_TYPE, fc_type) |
FIELD_PREP(MT_TXD2_SUB_TYPE, fc_stype) |
FIELD_PREP(MT_TXD2_MULTICAST, multicast);

if (multicast)
val |= MT_TXD2_FIX_RATE;

txwi[2] |= cpu_to_le32(val);

val = FIELD_PREP(MT_TXD7_TYPE, fc_type) |
FIELD_PREP(MT_TXD7_SUB_TYPE, fc_stype);
txwi[7] |= cpu_to_le32(val);
}

static void
mt7915_mac_write_txwi_80211(struct mt7915_dev *dev, __le32 *txwi,
struct sk_buff *skb, struct ieee80211_key_conf *key)
{
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)skb->data;
struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
bool multicast = is_multicast_ether_addr(hdr->addr1);
u8 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK;
__le16 fc = hdr->frame_control;
u8 fc_type, fc_stype;
u32 val;

if (ieee80211_is_action(fc) &&
mgmt->u.action.category == WLAN_CATEGORY_BACK &&
mgmt->u.action.u.addba_req.action_code == WLAN_ACTION_ADDBA_REQ) {
u16 capab = le16_to_cpu(mgmt->u.action.u.addba_req.capab);

txwi[5] |= cpu_to_le32(MT_TXD5_ADD_BA);
tid = (capab >> 2) & IEEE80211_QOS_CTL_TID_MASK;
} else if (ieee80211_is_back_req(hdr->frame_control)) {
struct ieee80211_bar *bar = (struct ieee80211_bar *)hdr;
u16 control = le16_to_cpu(bar->control);

tid = FIELD_GET(IEEE80211_BAR_CTRL_TID_INFO_MASK, control);
}

val = FIELD_PREP(MT_TXD1_HDR_FORMAT, MT_HDR_FORMAT_802_11) |
FIELD_PREP(MT_TXD1_HDR_INFO,
ieee80211_get_hdrlen_from_skb(skb) / 2) |
FIELD_PREP(MT_TXD1_TID, tid);
txwi[1] |= cpu_to_le32(val);

fc_type = (le16_to_cpu(fc) & IEEE80211_FCTL_FTYPE) >> 2;
fc_stype = (le16_to_cpu(fc) & IEEE80211_FCTL_STYPE) >> 4;

val = FIELD_PREP(MT_TXD2_FRAME_TYPE, fc_type) |
FIELD_PREP(MT_TXD2_SUB_TYPE, fc_stype) |
FIELD_PREP(MT_TXD2_MULTICAST, multicast);

if (key && multicast && ieee80211_is_robust_mgmt_frame(skb) &&
key->cipher == WLAN_CIPHER_SUITE_AES_CMAC) {
val |= MT_TXD2_BIP;
txwi[3] &= ~cpu_to_le32(MT_TXD3_PROTECT_FRAME);
}

if (!ieee80211_is_data(fc) || multicast)
val |= MT_TXD2_FIX_RATE;

txwi[2] |= cpu_to_le32(val);

if (ieee80211_is_beacon(fc)) {
txwi[3] &= ~cpu_to_le32(MT_TXD3_SW_POWER_MGMT);
txwi[3] |= cpu_to_le32(MT_TXD3_REM_TX_COUNT);
}

if (info->flags & IEEE80211_TX_CTL_INJECTED) {
u16 seqno = le16_to_cpu(hdr->seq_ctrl);

if (ieee80211_is_back_req(hdr->frame_control)) {
struct ieee80211_bar *bar;

bar = (struct ieee80211_bar *)skb->data;
seqno = le16_to_cpu(bar->start_seq_num);
}

val = MT_TXD3_SN_VALID |
FIELD_PREP(MT_TXD3_SEQ, IEEE80211_SEQ_TO_SN(seqno));
txwi[3] |= cpu_to_le32(val);
}

val = FIELD_PREP(MT_TXD7_TYPE, fc_type) |
FIELD_PREP(MT_TXD7_SUB_TYPE, fc_stype);
txwi[7] |= cpu_to_le32(val);
}

void mt7915_mac_write_txwi(struct mt7915_dev *dev, __le32 *txwi,
struct sk_buff *skb, struct mt76_wcid *wcid,
struct ieee80211_key_conf *key, bool beacon)
{
struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)skb->data;
bool multicast = is_multicast_ether_addr(hdr->addr1);
struct ieee80211_vif *vif = info->control.vif;
struct mt76_phy *mphy = &dev->mphy;
bool ext_phy = info->hw_queue & MT_TX_HW_QUEUE_EXT_PHY;
u8 fc_type, fc_stype, p_fmt, q_idx, omac_idx = 0, wmm_idx = 0;
__le16 fc = hdr->frame_control;
u16 tx_count = 15, seqno = 0;
u8 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK;
u8 p_fmt, q_idx, omac_idx = 0, wmm_idx = 0;
bool is_8023 = info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP;
u16 tx_count = 15;
u32 val;

if (vif) {
Expand All @@ -594,13 +710,6 @@ void mt7915_mac_write_txwi(struct mt7915_dev *dev, __le32 *txwi,
if (ext_phy && dev->mt76.phy2)
mphy = dev->mt76.phy2;

fc_type = (le16_to_cpu(fc) & IEEE80211_FCTL_FTYPE) >> 2;
fc_stype = (le16_to_cpu(fc) & IEEE80211_FCTL_STYPE) >> 4;

txwi[4] = 0;
txwi[5] = 0;
txwi[6] = 0;

if (beacon) {
p_fmt = MT_TX_TYPE_FW;
q_idx = MT_LMAC_BCN0;
Expand All @@ -613,59 +722,45 @@ void mt7915_mac_write_txwi(struct mt7915_dev *dev, __le32 *txwi,
mt7915_lmac_mapping(dev, skb_get_queue_mapping(skb));
}

if (ieee80211_is_action(fc) &&
mgmt->u.action.category == WLAN_CATEGORY_BACK &&
mgmt->u.action.u.addba_req.action_code == WLAN_ACTION_ADDBA_REQ) {
u16 capab = le16_to_cpu(mgmt->u.action.u.addba_req.capab);

txwi[5] |= cpu_to_le32(MT_TXD5_ADD_BA);
tid = (capab >> 2) & IEEE80211_QOS_CTL_TID_MASK;
} else if (ieee80211_is_back_req(hdr->frame_control)) {
struct ieee80211_bar *bar = (struct ieee80211_bar *)hdr;
u16 control = le16_to_cpu(bar->control);

tid = FIELD_GET(IEEE80211_BAR_CTRL_TID_INFO_MASK, control);
}

val = FIELD_PREP(MT_TXD0_TX_BYTES, skb->len + MT_TXD_SIZE) |
FIELD_PREP(MT_TXD0_PKT_FMT, p_fmt) |
FIELD_PREP(MT_TXD0_Q_IDX, q_idx);
txwi[0] = cpu_to_le32(val);

val = MT_TXD1_LONG_FORMAT |
FIELD_PREP(MT_TXD1_WLAN_IDX, wcid->idx) |
FIELD_PREP(MT_TXD1_HDR_FORMAT, MT_HDR_FORMAT_802_11) |
FIELD_PREP(MT_TXD1_HDR_INFO,
ieee80211_get_hdrlen_from_skb(skb) / 2) |
FIELD_PREP(MT_TXD1_TID, tid) |
FIELD_PREP(MT_TXD1_OWN_MAC, omac_idx);

if (ext_phy && q_idx >= MT_LMAC_ALTX0 && q_idx <= MT_LMAC_BCN0)
val |= MT_TXD1_TGID;

txwi[1] = cpu_to_le32(val);

val = FIELD_PREP(MT_TXD2_FRAME_TYPE, fc_type) |
FIELD_PREP(MT_TXD2_SUB_TYPE, fc_stype) |
FIELD_PREP(MT_TXD2_MULTICAST, multicast);
if (key) {
if (multicast && ieee80211_is_robust_mgmt_frame(skb) &&
key->cipher == WLAN_CIPHER_SUITE_AES_CMAC) {
val |= MT_TXD2_BIP;
txwi[3] = 0;
} else {
txwi[3] = cpu_to_le32(MT_TXD3_PROTECT_FRAME);
}
} else {
txwi[3] = 0;
}
txwi[2] = cpu_to_le32(val);
txwi[2] = 0;

val = MT_TXD3_SW_POWER_MGMT |
FIELD_PREP(MT_TXD3_REM_TX_COUNT, tx_count);
if (key)
val |= MT_TXD3_PROTECT_FRAME;
if (info->flags & IEEE80211_TX_CTL_NO_ACK)
val |= MT_TXD3_NO_ACK;

txwi[3] = cpu_to_le32(val);
txwi[4] = 0;
txwi[5] = 0;
txwi[6] = 0;
txwi[7] = wcid->amsdu ? cpu_to_le32(MT_TXD7_HW_AMSDU) : 0;

if (!ieee80211_is_data(fc) || multicast) {
if (is_8023)
mt7915_mac_write_txwi_8023(dev, txwi, skb, wcid);
else
mt7915_mac_write_txwi_80211(dev, txwi, skb, key);

if (txwi[2] & cpu_to_le32(MT_TXD2_FIX_RATE)) {
u16 rate;

/* hardware won't add HTC for mgmt/ctrl frame */
txwi[2] |= cpu_to_le32(MT_TXD2_FIX_RATE | MT_TXD2_HTC_VLD);
txwi[2] |= cpu_to_le32(MT_TXD2_HTC_VLD);

if (mphy->chandef.chan->band == NL80211_BAND_5GHZ)
rate = MT7915_5G_RATE_DEFAULT;
Expand All @@ -677,36 +772,6 @@ void mt7915_mac_write_txwi(struct mt7915_dev *dev, __le32 *txwi,
txwi[6] |= cpu_to_le32(val);
txwi[3] |= cpu_to_le32(MT_TXD3_BA_DISABLE);
}

if (!ieee80211_is_beacon(fc))
txwi[3] |= cpu_to_le32(MT_TXD3_SW_POWER_MGMT);
else
tx_count = 0x1f;

if (info->flags & IEEE80211_TX_CTL_NO_ACK)
txwi[3] |= cpu_to_le32(MT_TXD3_NO_ACK);

val = FIELD_PREP(MT_TXD7_TYPE, fc_type) |
FIELD_PREP(MT_TXD7_SUB_TYPE, fc_stype);
if (wcid->amsdu)
val |= MT_TXD7_HW_AMSDU;
txwi[7] = cpu_to_le32(val);

val = FIELD_PREP(MT_TXD3_REM_TX_COUNT, tx_count);
if (info->flags & IEEE80211_TX_CTL_INJECTED) {
seqno = le16_to_cpu(hdr->seq_ctrl);

if (ieee80211_is_back_req(hdr->frame_control)) {
struct ieee80211_bar *bar;

bar = (struct ieee80211_bar *)skb->data;
seqno = le16_to_cpu(bar->start_seq_num);
}

val |= MT_TXD3_SN_VALID |
FIELD_PREP(MT_TXD3_SEQ, IEEE80211_SEQ_TO_SN(seqno));
}
txwi[3] |= cpu_to_le32(val);
}

int mt7915_tx_prepare_skb(struct mt76_dev *mdev, void *txwi_ptr,
Expand All @@ -728,11 +793,11 @@ int mt7915_tx_prepare_skb(struct mt76_dev *mdev, void *txwi_ptr,
if (!wcid)
wcid = &dev->mt76.global_wcid;

cb->wcid = wcid->idx;

mt7915_mac_write_txwi(dev, txwi_ptr, tx_info->skb, wcid, key,
false);

cb->wcid = wcid->idx;

txp = (struct mt7915_txp *)(txwi + MT_TXD_SIZE);
for (i = 0; i < nbuf; i++) {
txp->buf[i] = cpu_to_le32(tx_info->buf[i + 1].addr);
Expand All @@ -750,7 +815,8 @@ int mt7915_tx_prepare_skb(struct mt76_dev *mdev, void *txwi_ptr,
if (!key)
txp->flags |= cpu_to_le16(MT_CT_INFO_NONE_CIPHER_FRAME);

if (ieee80211_is_mgmt(hdr->frame_control))
if (!(info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) &&
ieee80211_is_mgmt(hdr->frame_control))
txp->flags |= cpu_to_le16(MT_CT_INFO_MGMT_FRAME);

if (vif) {
Expand Down Expand Up @@ -843,7 +909,8 @@ mt7915_tx_complete_status(struct mt76_dev *mdev, struct sk_buff *skb,

info->status.tx_time = 0;

if (info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS) {
if (info->flags & (IEEE80211_TX_CTL_REQ_TX_STATUS |
IEEE80211_TX_CTL_HW_80211_ENCAP)) {
mt7915_tx_status(sta, hw, info, skb);
return;
}
Expand Down
1 change: 1 addition & 0 deletions mt7915/mac.h
View file
Expand Up @@ -176,6 +176,7 @@ enum tx_mcu_port_q_idx {
#define MT_TXD1_HDR_PAD GENMASK(19, 18)
#define MT_TXD1_HDR_FORMAT GENMASK(17, 16)
#define MT_TXD1_HDR_INFO GENMASK(15, 11)
#define MT_TXD1_ETH_802_3 BIT(15)
#define MT_TXD1_VTA BIT(10)
#define MT_TXD1_WLAN_IDX GENMASK(9, 0)

Expand Down
19 changes: 19 additions & 0 deletions mt7915/mcu.c
View file
Expand Up @@ -1688,6 +1688,24 @@ mt7915_mcu_wtbl_ht_tlv(struct sk_buff *skb, struct ieee80211_sta *sta,
mt7915_mcu_wtbl_smps_tlv(skb, sta, sta_wtbl, wtbl_tlv);
}

static void
mt7915_mcu_wtbl_hdr_trans_tlv(struct sk_buff *skb, struct ieee80211_vif *vif,
struct ieee80211_sta *sta,
void *sta_wtbl, void *wtbl_tlv)
{
struct wtbl_hdr_trans *htr = NULL;
struct tlv *tlv;

tlv = mt7915_mcu_add_nested_tlv(skb, WTBL_HDR_TRANS, sizeof(*htr),
wtbl_tlv, sta_wtbl);
htr = (struct wtbl_hdr_trans *)tlv;
htr->no_rx_trans = true;
if (vif->type == NL80211_IFTYPE_STATION)
htr->to_ds = true;
else
htr->from_ds = true;
}

int mt7915_mcu_add_smps(struct mt7915_dev *dev, struct ieee80211_vif *vif,
struct ieee80211_sta *sta)
{
Expand Down Expand Up @@ -2277,6 +2295,7 @@ int mt7915_mcu_add_sta(struct mt7915_dev *dev, struct ieee80211_vif *vif,
sta_wtbl, &skb);
if (enable) {
mt7915_mcu_wtbl_generic_tlv(skb, vif, sta, sta_wtbl, wtbl_hdr);
mt7915_mcu_wtbl_hdr_trans_tlv(skb, vif, sta, sta_wtbl, wtbl_hdr);
if (sta)
mt7915_mcu_wtbl_ht_tlv(skb, sta, sta_wtbl, wtbl_hdr);
}
Expand Down
10 changes: 10 additions & 0 deletions mt7915/mcu.h
View file
Expand Up @@ -551,6 +551,15 @@ struct wtbl_vht {
u8 rsv[4];
} __packed;

struct wtbl_hdr_trans {
__le16 tag;
__le16 len;
u8 to_ds;
u8 from_ds;
u8 no_rx_trans;
u8 _rsv;
};

enum {
MT_BA_TYPE_INVALID,
MT_BA_TYPE_ORIGINATOR,
Expand Down Expand Up @@ -972,6 +981,7 @@ enum {
sizeof(struct wtbl_rx) + \
sizeof(struct wtbl_ht) + \
sizeof(struct wtbl_vht) + \
sizeof(struct wtbl_hdr_trans) +\
sizeof(struct wtbl_ba) + \
sizeof(struct wtbl_smps))

Expand Down
1 change: 1 addition & 0 deletions tx.c
View file
Expand Up @@ -288,6 +288,7 @@ mt76_tx(struct mt76_phy *phy, struct ieee80211_sta *sta,
}

if ((dev->drv->drv_flags & MT_DRV_HW_MGMT_TXQ) &&
!(info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) &&
!ieee80211_is_data(hdr->frame_control) &&
!ieee80211_is_bufferable_mmpdu(hdr->frame_control)) {
qid = MT_TXQ_PSD;
Expand Down

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