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iwlegacy: gather all 4965 handlers in one place
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Handers belongs logically into 4965-mac.c file.

Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
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Stanislaw Gruszka authored and John W. Linville committed Feb 22, 2012
1 parent 93a984a commit 3dfea27
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Showing 4 changed files with 305 additions and 325 deletions.
307 changes: 305 additions & 2 deletions drivers/net/wireless/iwlegacy/4965-mac.c
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Original file line number Diff line number Diff line change
Expand Up @@ -2548,6 +2548,308 @@ il4965_tx_status_reply_compressed_ba(struct il_priv *il, struct il_ht_agg *agg,
return 0;
}

static inline bool
il4965_is_tx_success(u32 status)
{
status &= TX_STATUS_MSK;
return (status == TX_STATUS_SUCCESS || status == TX_STATUS_DIRECT_DONE);
}

static u8
il4965_find_station(struct il_priv *il, const u8 *addr)
{
int i;
int start = 0;
int ret = IL_INVALID_STATION;
unsigned long flags;

if (il->iw_mode == NL80211_IFTYPE_ADHOC)
start = IL_STA_ID;

if (is_broadcast_ether_addr(addr))
return il->hw_params.bcast_id;

spin_lock_irqsave(&il->sta_lock, flags);
for (i = start; i < il->hw_params.max_stations; i++)
if (il->stations[i].used &&
(!compare_ether_addr(il->stations[i].sta.sta.addr, addr))) {
ret = i;
goto out;
}

D_ASSOC("can not find STA %pM total %d\n", addr, il->num_stations);

out:
/*
* It may be possible that more commands interacting with stations
* arrive before we completed processing the adding of
* station
*/
if (ret != IL_INVALID_STATION &&
(!(il->stations[ret].used & IL_STA_UCODE_ACTIVE) ||
((il->stations[ret].used & IL_STA_UCODE_ACTIVE) &&
(il->stations[ret].used & IL_STA_UCODE_INPROGRESS)))) {
IL_ERR("Requested station info for sta %d before ready.\n",
ret);
ret = IL_INVALID_STATION;
}
spin_unlock_irqrestore(&il->sta_lock, flags);
return ret;
}

static int
il4965_get_ra_sta_id(struct il_priv *il, struct ieee80211_hdr *hdr)
{
if (il->iw_mode == NL80211_IFTYPE_STATION)
return IL_AP_ID;
else {
u8 *da = ieee80211_get_DA(hdr);

return il4965_find_station(il, da);
}
}

static inline u32
il4965_get_scd_ssn(struct il4965_tx_resp *tx_resp)
{
return le32_to_cpup(&tx_resp->u.status + tx_resp->frame_count) & MAX_SN;
}

static inline u32
il4965_tx_status_to_mac80211(u32 status)
{
status &= TX_STATUS_MSK;

switch (status) {
case TX_STATUS_SUCCESS:
case TX_STATUS_DIRECT_DONE:
return IEEE80211_TX_STAT_ACK;
case TX_STATUS_FAIL_DEST_PS:
return IEEE80211_TX_STAT_TX_FILTERED;
default:
return 0;
}
}

/**
* il4965_tx_status_reply_tx - Handle Tx response for frames in aggregation queue
*/
static int
il4965_tx_status_reply_tx(struct il_priv *il, struct il_ht_agg *agg,
struct il4965_tx_resp *tx_resp, int txq_id,
u16 start_idx)
{
u16 status;
struct agg_tx_status *frame_status = tx_resp->u.agg_status;
struct ieee80211_tx_info *info = NULL;
struct ieee80211_hdr *hdr = NULL;
u32 rate_n_flags = le32_to_cpu(tx_resp->rate_n_flags);
int i, sh, idx;
u16 seq;
if (agg->wait_for_ba)
D_TX_REPLY("got tx response w/o block-ack\n");

agg->frame_count = tx_resp->frame_count;
agg->start_idx = start_idx;
agg->rate_n_flags = rate_n_flags;
agg->bitmap = 0;

/* num frames attempted by Tx command */
if (agg->frame_count == 1) {
/* Only one frame was attempted; no block-ack will arrive */
status = le16_to_cpu(frame_status[0].status);
idx = start_idx;

D_TX_REPLY("FrameCnt = %d, StartIdx=%d idx=%d\n",
agg->frame_count, agg->start_idx, idx);

info = IEEE80211_SKB_CB(il->txq[txq_id].skbs[idx]);
info->status.rates[0].count = tx_resp->failure_frame + 1;
info->flags &= ~IEEE80211_TX_CTL_AMPDU;
info->flags |= il4965_tx_status_to_mac80211(status);
il4965_hwrate_to_tx_control(il, rate_n_flags, info);

D_TX_REPLY("1 Frame 0x%x failure :%d\n", status & 0xff,
tx_resp->failure_frame);
D_TX_REPLY("Rate Info rate_n_flags=%x\n", rate_n_flags);

agg->wait_for_ba = 0;
} else {
/* Two or more frames were attempted; expect block-ack */
u64 bitmap = 0;
int start = agg->start_idx;
struct sk_buff *skb;

/* Construct bit-map of pending frames within Tx win */
for (i = 0; i < agg->frame_count; i++) {
u16 sc;
status = le16_to_cpu(frame_status[i].status);
seq = le16_to_cpu(frame_status[i].sequence);
idx = SEQ_TO_IDX(seq);
txq_id = SEQ_TO_QUEUE(seq);

if (status &
(AGG_TX_STATE_FEW_BYTES_MSK |
AGG_TX_STATE_ABORT_MSK))
continue;

D_TX_REPLY("FrameCnt = %d, txq_id=%d idx=%d\n",
agg->frame_count, txq_id, idx);

skb = il->txq[txq_id].skbs[idx];
if (WARN_ON_ONCE(skb == NULL))
return -1;
hdr = (struct ieee80211_hdr *) skb->data;

sc = le16_to_cpu(hdr->seq_ctrl);
if (idx != (SEQ_TO_SN(sc) & 0xff)) {
IL_ERR("BUG_ON idx doesn't match seq control"
" idx=%d, seq_idx=%d, seq=%d\n", idx,
SEQ_TO_SN(sc), hdr->seq_ctrl);
return -1;
}

D_TX_REPLY("AGG Frame i=%d idx %d seq=%d\n", i, idx,
SEQ_TO_SN(sc));

sh = idx - start;
if (sh > 64) {
sh = (start - idx) + 0xff;
bitmap = bitmap << sh;
sh = 0;
start = idx;
} else if (sh < -64)
sh = 0xff - (start - idx);
else if (sh < 0) {
sh = start - idx;
start = idx;
bitmap = bitmap << sh;
sh = 0;
}
bitmap |= 1ULL << sh;
D_TX_REPLY("start=%d bitmap=0x%llx\n", start,
(unsigned long long)bitmap);
}

agg->bitmap = bitmap;
agg->start_idx = start;
D_TX_REPLY("Frames %d start_idx=%d bitmap=0x%llx\n",
agg->frame_count, agg->start_idx,
(unsigned long long)agg->bitmap);

if (bitmap)
agg->wait_for_ba = 1;
}
return 0;
}

/**
* il4965_hdl_tx - Handle standard (non-aggregation) Tx response
*/
static void
il4965_hdl_tx(struct il_priv *il, struct il_rx_buf *rxb)
{
struct il_rx_pkt *pkt = rxb_addr(rxb);
u16 sequence = le16_to_cpu(pkt->hdr.sequence);
int txq_id = SEQ_TO_QUEUE(sequence);
int idx = SEQ_TO_IDX(sequence);
struct il_tx_queue *txq = &il->txq[txq_id];
struct sk_buff *skb;
struct ieee80211_hdr *hdr;
struct ieee80211_tx_info *info;
struct il4965_tx_resp *tx_resp = (void *)&pkt->u.raw[0];
u32 status = le32_to_cpu(tx_resp->u.status);
int uninitialized_var(tid);
int sta_id;
int freed;
u8 *qc = NULL;
unsigned long flags;

if (idx >= txq->q.n_bd || il_queue_used(&txq->q, idx) == 0) {
IL_ERR("Read idx for DMA queue txq_id (%d) idx %d "
"is out of range [0-%d] %d %d\n", txq_id, idx,
txq->q.n_bd, txq->q.write_ptr, txq->q.read_ptr);
return;
}

txq->time_stamp = jiffies;

skb = txq->skbs[txq->q.read_ptr];
info = IEEE80211_SKB_CB(skb);
memset(&info->status, 0, sizeof(info->status));

hdr = (struct ieee80211_hdr *) skb->data;
if (ieee80211_is_data_qos(hdr->frame_control)) {
qc = ieee80211_get_qos_ctl(hdr);
tid = qc[0] & 0xf;
}

sta_id = il4965_get_ra_sta_id(il, hdr);
if (txq->sched_retry && unlikely(sta_id == IL_INVALID_STATION)) {
IL_ERR("Station not known\n");
return;
}

spin_lock_irqsave(&il->sta_lock, flags);
if (txq->sched_retry) {
const u32 scd_ssn = il4965_get_scd_ssn(tx_resp);
struct il_ht_agg *agg = NULL;
WARN_ON(!qc);

agg = &il->stations[sta_id].tid[tid].agg;

il4965_tx_status_reply_tx(il, agg, tx_resp, txq_id, idx);

/* check if BAR is needed */
if (tx_resp->frame_count == 1 &&
!il4965_is_tx_success(status))
info->flags |= IEEE80211_TX_STAT_AMPDU_NO_BACK;

if (txq->q.read_ptr != (scd_ssn & 0xff)) {
idx = il_queue_dec_wrap(scd_ssn & 0xff, txq->q.n_bd);
D_TX_REPLY("Retry scheduler reclaim scd_ssn "
"%d idx %d\n", scd_ssn, idx);
freed = il4965_tx_queue_reclaim(il, txq_id, idx);
if (qc)
il4965_free_tfds_in_queue(il, sta_id, tid,
freed);

if (il->mac80211_registered &&
il_queue_space(&txq->q) > txq->q.low_mark &&
agg->state != IL_EMPTYING_HW_QUEUE_DELBA)
il_wake_queue(il, txq);
}
} else {
info->status.rates[0].count = tx_resp->failure_frame + 1;
info->flags |= il4965_tx_status_to_mac80211(status);
il4965_hwrate_to_tx_control(il,
le32_to_cpu(tx_resp->rate_n_flags),
info);

D_TX_REPLY("TXQ %d status %s (0x%08x) "
"rate_n_flags 0x%x retries %d\n", txq_id,
il4965_get_tx_fail_reason(status), status,
le32_to_cpu(tx_resp->rate_n_flags),
tx_resp->failure_frame);

freed = il4965_tx_queue_reclaim(il, txq_id, idx);
if (qc && likely(sta_id != IL_INVALID_STATION))
il4965_free_tfds_in_queue(il, sta_id, tid, freed);
else if (sta_id == IL_INVALID_STATION)
D_TX_REPLY("Station not known\n");

if (il->mac80211_registered &&
il_queue_space(&txq->q) > txq->q.low_mark)
il_wake_queue(il, txq);
}
if (qc && likely(sta_id != IL_INVALID_STATION))
il4965_txq_check_empty(il, sta_id, tid, txq_id);

il4965_check_abort_status(il, tx_resp->frame_count, status);

spin_unlock_irqrestore(&il->sta_lock, flags);
}

/**
* translate ucode response to mac80211 tx status control values
*/
Expand Down Expand Up @@ -3868,10 +4170,11 @@ il4965_setup_handlers(struct il_priv *il)
/* Rx handlers */
il->handlers[N_RX_PHY] = il4965_hdl_rx_phy;
il->handlers[N_RX_MPDU] = il4965_hdl_rx;
il->handlers[N_RX] = il4965_hdl_rx;
/* block ack */
il->handlers[N_COMPRESSED_BA] = il4965_hdl_compressed_ba;
/* Set up hardware specific Rx handlers */
il->ops->lib->handler_setup(il);
/* Tx response */
il->handlers[C_TX] = il4965_hdl_tx;
}

/**
Expand Down
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