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mwl8k: Initiate BA sessions

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Specifically, handle ampdu_action and attempt to start a BA
session on receiving the first qos packet from mac80211 for
transmission to a HT sta.  While the BA session is being created,
all the packets belonging to that stream will be dropped to
prevent sequence number mismatch at the recipient.

Contains contributions from:
Yogesh Powar <yogeshp@marvell.com>
Pradeep Nemavat <pnemavat@marvell.com>
Brian Cavagnolo <brian@cozybit.com>

Signed-off-by: Brian Cavagnolo <brian@cozybit.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Nishant Sarmukadam 2011-03-17 11:58:46 -07:00 committed by John W. Linville
parent ac109fd042
commit 65f3ddcd08
1 changed files with 187 additions and 7 deletions
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194
drivers/net/wireless/mwl8k.c
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@ -1577,7 +1577,8 @@ mwl8k_txq_reclaim(struct ieee80211_hw *hw, int index, int limit, int force)
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;
@ -1677,6 +1678,7 @@ mwl8k_txq_xmit(struct ieee80211_hw *hw, int index, struct sk_buff *skb)
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;
@ -1684,6 +1686,10 @@ mwl8k_txq_xmit(struct ieee80211_hw *hw, int index, struct sk_buff *skb)
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))
@ -1699,6 +1705,7 @@ mwl8k_txq_xmit(struct ieee80211_hw *hw, int index, struct sk_buff *skb)
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) {
@ -1726,12 +1733,70 @@ mwl8k_txq_xmit(struct ieee80211_hw *hw, int index, struct sk_buff *skb)
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.
*/
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;
}
@ -1740,12 +1805,22 @@ mwl8k_txq_xmit(struct ieee80211_hw *hw, int index, struct sk_buff *skb)
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);
@ -1764,12 +1839,20 @@ mwl8k_txq_xmit(struct ieee80211_hw *hw, int index, struct sk_buff *skb)
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);
}
}
@ -4632,21 +4715,118 @@ static int mwl8k_get_survey(struct ieee80211_hw *hw, int idx,
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 = {