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carl9170: fix frame drop and WARN due to minstrel_ht change

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With "mac80211/minstrel_ht: add support for using CCK rates"
minstrel_ht selects legacy CCK rates as viable rates for
outgoing frames which might be sent as part of an A-MPDU
[IEEE80211_TX_CTL_AMPDU is set].

This behavior triggered the following WARN_ON in the driver:
> WARNING: at carl9170/tx.c:995 carl9170_op_tx+0x1dd/0x6fd
The driver assumed that the rate control algorithm made a
mistake and dropped the frame.

This patch removes the noisy warning altogether and allows
said A-MPDU frames with CCK sample and/or fallback rates to
be transmitted seamlessly.

Signed-off-by: Christian Lamparter <chunkeey@googlemail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Christian Lamparter 2013-02-22 01:30:44 +01:00 committed by John W. Linville
parent a829148435
commit 5f34608fa2
1 changed files with 28 additions and 41 deletions
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69
drivers/net/wireless/ath/carl9170/tx.c
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@ -387,8 +387,7 @@ static void carl9170_tx_status_process_ampdu(struct ar9170 *ar,
u8 tid;
if (!(txinfo->flags & IEEE80211_TX_CTL_AMPDU) ||
txinfo->flags & IEEE80211_TX_CTL_INJECTED ||
(!(super->f.mac_control & cpu_to_le16(AR9170_TX_MAC_AGGR))))
txinfo->flags & IEEE80211_TX_CTL_INJECTED)
return;
rcu_read_lock();
@ -981,30 +980,6 @@ static int carl9170_tx_prepare(struct ar9170 *ar,
SET_VAL(CARL9170_TX_SUPER_AMPDU_FACTOR,
txc->s.ampdu_settings, factor);
for (i = 0; i < CARL9170_TX_MAX_RATES; i++) {
txrate = &info->control.rates[i];
if (txrate->idx >= 0) {
txc->s.ri[i] =
CARL9170_TX_SUPER_RI_AMPDU;
if (WARN_ON(!(txrate->flags &
IEEE80211_TX_RC_MCS))) {
/*
* Not sure if it's even possible
* to aggregate non-ht rates with
* this HW.
*/
goto err_out;
}
continue;
}
txrate->idx = 0;
txrate->count = ar->hw->max_rate_tries;
}
mac_tmp |= cpu_to_le16(AR9170_TX_MAC_AGGR);
}
/*
@ -1012,11 +987,31 @@ static int carl9170_tx_prepare(struct ar9170 *ar,
* taken from mac_control. For all fallback rate, the firmware
* updates the mac_control flags from the rate info field.
*/
for (i = 1; i < CARL9170_TX_MAX_RATES; i++) {
for (i = 0; i < CARL9170_TX_MAX_RATES; i++) {
__le32 phy_set;
txrate = &info->control.rates[i];
if (txrate->idx < 0)
break;
phy_set = carl9170_tx_physet(ar, info, txrate);
if (i == 0) {
/* first rate - part of the hw's frame header */
txc->f.phy_control = phy_set;
if (ampdu && txrate->flags & IEEE80211_TX_RC_MCS)
mac_tmp |= cpu_to_le16(AR9170_TX_MAC_AGGR);
if (carl9170_tx_rts_check(ar, txrate, ampdu, no_ack))
mac_tmp |= cpu_to_le16(AR9170_TX_MAC_PROT_RTS);
else if (carl9170_tx_cts_check(ar, txrate))
mac_tmp |= cpu_to_le16(AR9170_TX_MAC_PROT_CTS);
} else {
/* fallback rates are stored in the firmware's
* retry rate set array.
*/
txc->s.rr[i - 1] = phy_set;
}
SET_VAL(CARL9170_TX_SUPER_RI_TRIES, txc->s.ri[i],
txrate->count);
@ -1027,21 +1022,13 @@ static int carl9170_tx_prepare(struct ar9170 *ar,
txc->s.ri[i] |= (AR9170_TX_MAC_PROT_CTS <<
CARL9170_TX_SUPER_RI_ERP_PROT_S);
txc->s.rr[i - 1] = carl9170_tx_physet(ar, info, txrate);
if (ampdu && (txrate->flags & IEEE80211_TX_RC_MCS))
txc->s.ri[i] |= CARL9170_TX_SUPER_RI_AMPDU;
}
txrate = &info->control.rates[0];
SET_VAL(CARL9170_TX_SUPER_RI_TRIES, txc->s.ri[0], txrate->count);
if (carl9170_tx_rts_check(ar, txrate, ampdu, no_ack))
mac_tmp |= cpu_to_le16(AR9170_TX_MAC_PROT_RTS);
else if (carl9170_tx_cts_check(ar, txrate))
mac_tmp |= cpu_to_le16(AR9170_TX_MAC_PROT_CTS);
txc->s.len = cpu_to_le16(skb->len);
txc->f.length = cpu_to_le16(len + FCS_LEN);
txc->f.mac_control = mac_tmp;
txc->f.phy_control = carl9170_tx_physet(ar, info, txrate);
arinfo = (void *)info->rate_driver_data;
arinfo->timeout = jiffies;
@ -1381,9 +1368,9 @@ static void carl9170_tx(struct ar9170 *ar)
}
static bool carl9170_tx_ampdu_queue(struct ar9170 *ar,
struct ieee80211_sta *sta, struct sk_buff *skb)
struct ieee80211_sta *sta, struct sk_buff *skb,
struct ieee80211_tx_info *txinfo)
{
struct _carl9170_tx_superframe *super = (void *) skb->data;
struct carl9170_sta_info *sta_info;
struct carl9170_sta_tid *agg;
struct sk_buff *iter;
@ -1450,7 +1437,7 @@ static bool carl9170_tx_ampdu_queue(struct ar9170 *ar,
err_unlock_rcu:
rcu_read_unlock();
super->f.mac_control &= ~cpu_to_le16(AR9170_TX_MAC_AGGR);
txinfo->flags &= ~IEEE80211_TX_CTL_AMPDU;
carl9170_tx_status(ar, skb, false);
ar->tx_dropped++;
return false;
@ -1492,7 +1479,7 @@ void carl9170_op_tx(struct ieee80211_hw *hw,
* sta == NULL checks are redundant in this
* special case.
*/
run = carl9170_tx_ampdu_queue(ar, sta, skb);
run = carl9170_tx_ampdu_queue(ar, sta, skb, info);
if (run)
carl9170_tx_ampdu(ar);