#define MWL8K_HIU_A2H_INTERRUPT_CLEAR_SEL 0x00000c38
#define MWL8K_HIU_A2H_INTERRUPT_STATUS_MASK 0x00000c3c
#define MWL8K_A2H_INT_DUMMY (1 << 20)
+#define MWL8K_A2H_INT_BA_WATCHDOG (1 << 14)
#define MWL8K_A2H_INT_CHNL_SWITCHED (1 << 11)
#define MWL8K_A2H_INT_QUEUE_EMPTY (1 << 10)
#define MWL8K_A2H_INT_RADAR_DETECT (1 << 7)
MWL8K_A2H_INT_MAC_EVENT | \
MWL8K_A2H_INT_OPC_DONE | \
MWL8K_A2H_INT_RX_READY | \
- MWL8K_A2H_INT_TX_DONE)
+ MWL8K_A2H_INT_TX_DONE | \
+ MWL8K_A2H_INT_BA_WATCHDOG)
#define MWL8K_RX_QUEUES 1
#define MWL8K_TX_WMM_QUEUES 4
u8 num_ampdu_queues;
spinlock_t stream_lock;
struct mwl8k_ampdu_stream ampdu[MWL8K_MAX_AMPDU_QUEUES];
+ struct work_struct watchdog_ba_handle;
/* firmware access */
struct mutex fw_mutex;
struct mwl8k_sta {
/* Index into station database. Returned by UPDATE_STADB. */
u8 peer_id;
+ u8 is_ampdu_allowed;
};
#define MWL8K_STA(_sta) ((struct mwl8k_sta *)&((_sta)->drv_priv))
#define MWL8K_CMD_ENABLE_SNIFFER 0x0150
#define MWL8K_CMD_SET_MAC_ADDR 0x0202 /* per-vif */
#define MWL8K_CMD_SET_RATEADAPT_MODE 0x0203
+#define MWL8K_CMD_GET_WATCHDOG_BITMAP 0x0205
#define MWL8K_CMD_BSS_START 0x1100 /* per-vif */
#define MWL8K_CMD_SET_NEW_STN 0x1111 /* per-vif */
#define MWL8K_CMD_UPDATE_ENCRYPTION 0x1122 /* per-vif */
MWL8K_CMDNAME(UPDATE_ENCRYPTION);
MWL8K_CMDNAME(UPDATE_STADB);
MWL8K_CMDNAME(BASTREAM);
+ MWL8K_CMDNAME(GET_WATCHDOG_BITMAP);
default:
snprintf(buf, bufsize, "0x%x", cmd);
}
MWL8K_TXD_STATUS_OK_RETRY | \
MWL8K_TXD_STATUS_OK_MORE_RETRY))
+/* The firmware will fill in the rate information
+ * for each packet that gets queued in the hardware
+ * in this structure
+ */
+
+struct rateinfo {
+ __le16 format:1;
+ __le16 short_gi:1;
+ __le16 band_width:1;
+ __le16 rate_id_mcs:6;
+ __le16 adv_coding:2;
+ __le16 antenna:2;
+ __le16 act_sub_chan:2;
+ __le16 preamble_type:1;
+ __le16 power_id:4;
+ __le16 antenna2:1;
+ __le16 reserved:1;
+ __le16 tx_bf_frame:1;
+ __le16 green_field:1;
+} __packed;
+
static int
mwl8k_txq_reclaim(struct ieee80211_hw *hw, int index, int limit, int force)
{
struct sk_buff *skb;
struct ieee80211_tx_info *info;
u32 status;
+ struct ieee80211_sta *sta;
+ struct mwl8k_sta *sta_info = NULL;
+ u16 rate_info;
+ struct rateinfo *rate;
+ struct ieee80211_hdr *wh;
tx = txq->head;
tx_desc = txq->txd + tx;
mwl8k_remove_dma_header(skb, tx_desc->qos_control);
+ wh = (struct ieee80211_hdr *) skb->data;
+
/* Mark descriptor as unused */
tx_desc->pkt_phys_addr = 0;
tx_desc->pkt_len = 0;
info = IEEE80211_SKB_CB(skb);
+ if (ieee80211_is_data(wh->frame_control)) {
+ sta = info->control.sta;
+ if (sta) {
+ sta_info = MWL8K_STA(sta);
+ BUG_ON(sta_info == NULL);
+ rate_info = le16_to_cpu(tx_desc->rate_info);
+ rate = (struct rateinfo *)&rate_info;
+ /* If rate is < 6.5 Mpbs for an ht station
+ * do not form an ampdu. If the station is a
+ * legacy station (format = 0), do not form an
+ * ampdu
+ */
+ if (rate->rate_id_mcs < 1 ||
+ rate->format == 0) {
+ sta_info->is_ampdu_allowed = false;
+ } else {
+ sta_info->is_ampdu_allowed = true;
+ }
+ }
+ }
+
ieee80211_tx_info_clear_status(info);
/* Rate control is happening in the firmware.
processed++;
}
- if (processed && priv->radio_on && !mutex_is_locked(&priv->fw_mutex))
+ if (index < MWL8K_TX_WMM_QUEUES && processed && priv->radio_on &&
+ !mutex_is_locked(&priv->fw_mutex))
ieee80211_wake_queue(hw, index);
return processed;
struct mwl8k_priv *priv = hw->priv;
struct ieee80211_tx_info *tx_info;
struct mwl8k_vif *mwl8k_vif;
+ struct ieee80211_sta *sta;
struct ieee80211_hdr *wh;
struct mwl8k_tx_queue *txq;
struct mwl8k_tx_desc *tx;
u32 txstatus;
u8 txdatarate;
u16 qos;
+ int txpriority;
+ u8 tid = 0;
+ struct mwl8k_ampdu_stream *stream = NULL;
+ bool start_ba_session = false;
wh = (struct ieee80211_hdr *)skb->data;
if (ieee80211_is_data_qos(wh->frame_control))
wh = &((struct mwl8k_dma_data *)skb->data)->wh;
tx_info = IEEE80211_SKB_CB(skb);
+ sta = tx_info->control.sta;
mwl8k_vif = MWL8K_VIF(tx_info->control.vif);
if (tx_info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ) {
qos |= MWL8K_QOS_ACK_POLICY_NORMAL;
}
+ txpriority = index;
+
+ if (ieee80211_is_data_qos(wh->frame_control) &&
+ skb->protocol != cpu_to_be16(ETH_P_PAE) &&
+ sta->ht_cap.ht_supported && priv->ap_fw) {
+ tid = qos & 0xf;
+ spin_lock(&priv->stream_lock);
+ stream = mwl8k_lookup_stream(hw, sta->addr, tid);
+ if (stream != NULL) {
+ if (stream->state == AMPDU_STREAM_ACTIVE) {
+ txpriority = stream->txq_idx;
+ index = stream->txq_idx;
+ } else if (stream->state == AMPDU_STREAM_NEW) {
+ /* We get here if the driver sends us packets
+ * after we've initiated a stream, but before
+ * our ampdu_action routine has been called
+ * with IEEE80211_AMPDU_TX_START to get the SSN
+ * for the ADDBA request. So this packet can
+ * go out with no risk of sequence number
+ * mismatch. No special handling is required.
+ */
+ } else {
+ /* Drop packets that would go out after the
+ * ADDBA request was sent but before the ADDBA
+ * response is received. If we don't do this,
+ * the recipient would probably receive it
+ * after the ADDBA request with SSN 0. This
+ * will cause the recipient's BA receive window
+ * to shift, which would cause the subsequent
+ * packets in the BA stream to be discarded.
+ * mac80211 queues our packets for us in this
+ * case, so this is really just a safety check.
+ */
+ wiphy_warn(hw->wiphy,
+ "Cannot send packet while ADDBA "
+ "dialog is underway.\n");
+ spin_unlock(&priv->stream_lock);
+ dev_kfree_skb(skb);
+ return;
+ }
+ } else {
+ /* Defer calling mwl8k_start_stream so that the current
+ * skb can go out before the ADDBA request. This
+ * prevents sequence number mismatch at the recepient
+ * as described above.
+ */
+ if (MWL8K_STA(sta)->is_ampdu_allowed) {
+ stream = mwl8k_add_stream(hw, sta, tid);
+ if (stream != NULL)
+ start_ba_session = true;
+ }
+ }
+ spin_unlock(&priv->stream_lock);
+ }
+
dma = pci_map_single(priv->pdev, skb->data,
skb->len, PCI_DMA_TODEVICE);
if (pci_dma_mapping_error(priv->pdev, dma)) {
wiphy_debug(hw->wiphy,
"failed to dma map skb, dropping TX frame.\n");
+ if (start_ba_session) {
+ spin_lock(&priv->stream_lock);
+ mwl8k_remove_stream(hw, stream);
+ spin_unlock(&priv->stream_lock);
+ }
dev_kfree_skb(skb);
return;
}
txq = priv->txq + index;
+ if (index >= MWL8K_TX_WMM_QUEUES && txq->len >= MWL8K_TX_DESCS) {
+ /* This is the case in which the tx packet is destined for an
+ * AMPDU queue and that AMPDU queue is full. Because we don't
+ * start and stop the AMPDU queues, we must drop these packets.
+ */
+ dev_kfree_skb(skb);
+ spin_unlock_bh(&priv->tx_lock);
+ return;
+ }
+
BUG_ON(txq->skb[txq->tail] != NULL);
txq->skb[txq->tail] = skb;
tx = txq->txd + txq->tail;
tx->data_rate = txdatarate;
- tx->tx_priority = index;
+ tx->tx_priority = txpriority;
tx->qos_control = cpu_to_le16(qos);
tx->pkt_phys_addr = cpu_to_le32(dma);
tx->pkt_len = cpu_to_le16(skb->len);
if (txq->tail == MWL8K_TX_DESCS)
txq->tail = 0;
- if (txq->head == txq->tail)
+ if (txq->head == txq->tail && index < MWL8K_TX_WMM_QUEUES)
ieee80211_stop_queue(hw, index);
mwl8k_tx_start(priv);
spin_unlock_bh(&priv->tx_lock);
+
+ /* Initiate the ampdu session here */
+ if (start_ba_session) {
+ spin_lock(&priv->stream_lock);
+ if (mwl8k_start_stream(hw, stream))
+ mwl8k_remove_stream(hw, stream);
+ spin_unlock(&priv->stream_lock);
+ }
}
return rc;
}
+/*
+ * CMD_GET_WATCHDOG_BITMAP.
+ */
+struct mwl8k_cmd_get_watchdog_bitmap {
+ struct mwl8k_cmd_pkt header;
+ u8 bitmap;
+} __packed;
+
+static int mwl8k_cmd_get_watchdog_bitmap(struct ieee80211_hw *hw, u8 *bitmap)
+{
+ struct mwl8k_cmd_get_watchdog_bitmap *cmd;
+ int rc;
+
+ cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
+ if (cmd == NULL)
+ return -ENOMEM;
+
+ cmd->header.code = cpu_to_le16(MWL8K_CMD_GET_WATCHDOG_BITMAP);
+ cmd->header.length = cpu_to_le16(sizeof(*cmd));
+
+ rc = mwl8k_post_cmd(hw, &cmd->header);
+ if (!rc)
+ *bitmap = cmd->bitmap;
+
+ kfree(cmd);
+
+ return rc;
+}
+
+#define INVALID_BA 0xAA
+static void mwl8k_watchdog_ba_events(struct work_struct *work)
+{
+ int rc;
+ u8 bitmap = 0, stream_index;
+ struct mwl8k_ampdu_stream *streams;
+ struct mwl8k_priv *priv =
+ container_of(work, struct mwl8k_priv, watchdog_ba_handle);
+
+ rc = mwl8k_cmd_get_watchdog_bitmap(priv->hw, &bitmap);
+ if (rc)
+ return;
+
+ if (bitmap == INVALID_BA)
+ return;
+
+ /* the bitmap is the hw queue number. Map it to the ampdu queue. */
+ stream_index = bitmap - MWL8K_TX_WMM_QUEUES;
+
+ BUG_ON(stream_index >= priv->num_ampdu_queues);
+
+ streams = &priv->ampdu[stream_index];
+
+ if (streams->state == AMPDU_STREAM_ACTIVE)
+ ieee80211_stop_tx_ba_session(streams->sta, streams->tid);
+
+ return;
+}
+
+
/*
* CMD_BSS_START.
*/
tasklet_schedule(&priv->poll_rx_task);
}
+ if (status & MWL8K_A2H_INT_BA_WATCHDOG) {
+ status &= ~MWL8K_A2H_INT_BA_WATCHDOG;
+ ieee80211_queue_work(hw, &priv->watchdog_ba_handle);
+ }
+
if (status)
iowrite32(~status, priv->regs + MWL8K_HIU_A2H_INTERRUPT_STATUS);
/* Stop finalize join worker */
cancel_work_sync(&priv->finalize_join_worker);
+ cancel_work_sync(&priv->watchdog_ba_handle);
if (priv->beacon_skb != NULL)
dev_kfree_skb(priv->beacon_skb);
ret = mwl8k_cmd_update_stadb_add(hw, vif, sta);
if (ret >= 0) {
MWL8K_STA(sta)->peer_id = ret;
+ if (sta->ht_cap.ht_supported)
+ MWL8K_STA(sta)->is_ampdu_allowed = true;
ret = 0;
}
return 0;
}
+#define MAX_AMPDU_ATTEMPTS 5
+
static int
mwl8k_ampdu_action(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
enum ieee80211_ampdu_mlme_action action,
struct ieee80211_sta *sta, u16 tid, u16 *ssn,
u8 buf_size)
{
+
+ int i, rc = 0;
+ struct mwl8k_priv *priv = hw->priv;
+ struct mwl8k_ampdu_stream *stream;
+ u8 *addr = sta->addr;
+
+ if (!(hw->flags & IEEE80211_HW_AMPDU_AGGREGATION))
+ return -ENOTSUPP;
+
+ spin_lock(&priv->stream_lock);
+ stream = mwl8k_lookup_stream(hw, addr, tid);
+
switch (action) {
case IEEE80211_AMPDU_RX_START:
case IEEE80211_AMPDU_RX_STOP:
- if (!(hw->flags & IEEE80211_HW_AMPDU_AGGREGATION))
- return -ENOTSUPP;
- return 0;
+ break;
+ case IEEE80211_AMPDU_TX_START:
+ /* By the time we get here the hw queues may contain outgoing
+ * packets for this RA/TID that are not part of this BA
+ * session. The hw will assign sequence numbers to these
+ * packets as they go out. So if we query the hw for its next
+ * sequence number and use that for the SSN here, it may end up
+ * being wrong, which will lead to sequence number mismatch at
+ * the recipient. To avoid this, we reset the sequence number
+ * to O for the first MPDU in this BA stream.
+ */
+ *ssn = 0;
+ if (stream == NULL) {
+ /* This means that somebody outside this driver called
+ * ieee80211_start_tx_ba_session. This is unexpected
+ * because we do our own rate control. Just warn and
+ * move on.
+ */
+ wiphy_warn(hw->wiphy, "Unexpected call to %s. "
+ "Proceeding anyway.\n", __func__);
+ stream = mwl8k_add_stream(hw, sta, tid);
+ }
+ if (stream == NULL) {
+ wiphy_debug(hw->wiphy, "no free AMPDU streams\n");
+ rc = -EBUSY;
+ break;
+ }
+ stream->state = AMPDU_STREAM_IN_PROGRESS;
+
+ /* Release the lock before we do the time consuming stuff */
+ spin_unlock(&priv->stream_lock);
+ for (i = 0; i < MAX_AMPDU_ATTEMPTS; i++) {
+ rc = mwl8k_check_ba(hw, stream);
+
+ if (!rc)
+ break;
+ /*
+ * HW queues take time to be flushed, give them
+ * sufficient time
+ */
+
+ msleep(1000);
+ }
+ spin_lock(&priv->stream_lock);
+ if (rc) {
+ wiphy_err(hw->wiphy, "Stream for tid %d busy after %d"
+ " attempts\n", tid, MAX_AMPDU_ATTEMPTS);
+ mwl8k_remove_stream(hw, stream);
+ rc = -EBUSY;
+ break;
+ }
+ ieee80211_start_tx_ba_cb_irqsafe(vif, addr, tid);
+ break;
+ case IEEE80211_AMPDU_TX_STOP:
+ if (stream == NULL)
+ break;
+ if (stream->state == AMPDU_STREAM_ACTIVE) {
+ spin_unlock(&priv->stream_lock);
+ mwl8k_destroy_ba(hw, stream);
+ spin_lock(&priv->stream_lock);
+ }
+ mwl8k_remove_stream(hw, stream);
+ ieee80211_stop_tx_ba_cb_irqsafe(vif, addr, tid);
+ break;
+ case IEEE80211_AMPDU_TX_OPERATIONAL:
+ BUG_ON(stream == NULL);
+ BUG_ON(stream->state != AMPDU_STREAM_IN_PROGRESS);
+ spin_unlock(&priv->stream_lock);
+ rc = mwl8k_create_ba(hw, stream, buf_size);
+ spin_lock(&priv->stream_lock);
+ if (!rc)
+ stream->state = AMPDU_STREAM_ACTIVE;
+ else {
+ spin_unlock(&priv->stream_lock);
+ mwl8k_destroy_ba(hw, stream);
+ spin_lock(&priv->stream_lock);
+ wiphy_debug(hw->wiphy,
+ "Failed adding stream for sta %pM tid %d\n",
+ addr, tid);
+ mwl8k_remove_stream(hw, stream);
+ }
+ break;
+
default:
- return -ENOTSUPP;
+ rc = -ENOTSUPP;
}
+
+ spin_unlock(&priv->stream_lock);
+ return rc;
}
static const struct ieee80211_ops mwl8k_ops = {
iowrite32(0, priv->regs + MWL8K_HIU_A2H_INTERRUPT_STATUS);
iowrite32(0, priv->regs + MWL8K_HIU_A2H_INTERRUPT_MASK);
- iowrite32(MWL8K_A2H_INT_TX_DONE | MWL8K_A2H_INT_RX_READY,
+ iowrite32(MWL8K_A2H_INT_TX_DONE|MWL8K_A2H_INT_RX_READY|
+ MWL8K_A2H_INT_BA_WATCHDOG,
priv->regs + MWL8K_HIU_A2H_INTERRUPT_CLEAR_SEL);
iowrite32(0xffffffff, priv->regs + MWL8K_HIU_A2H_INTERRUPT_STATUS_MASK);
/* Finalize join worker */
INIT_WORK(&priv->finalize_join_worker, mwl8k_finalize_join_worker);
+ /* Handle watchdog ba events */
+ INIT_WORK(&priv->watchdog_ba_handle, mwl8k_watchdog_ba_events);
/* TX reclaim and RX tasklets. */
tasklet_init(&priv->poll_tx_task, mwl8k_tx_poll, (unsigned long)hw);
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