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Date: Tue, 25 Jun 2013 11:32:16 -0700
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org,
Christian Lamparter <chunkeey@...glemail.com>,
"John W. Linville" <linville@...driver.com>,
Stanislaw Gruszka <sgruszka@...hat.com>
Subject: [ 29/95] carl9170: fix frame drop and WARN due to minstrel_ht change
3.9-stable review patch. If anyone has any objections, please let me know.
------------------
From: Christian Lamparter <chunkeey@...glemail.com>
commit 5f34608fa2acbfef5a06d0072a978c9943c28a2d upstream.
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@...glemail.com>
Signed-off-by: John W. Linville <linville@...driver.com>
Cc: Stanislaw Gruszka <sgruszka@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
drivers/net/wireless/ath/carl9170/tx.c | 69 +++++++++++++--------------------
1 file changed, 28 insertions(+), 41 deletions(-)
--- a/drivers/net/wireless/ath/carl9170/tx.c
+++ b/drivers/net/wireless/ath/carl9170/tx.c
@@ -387,8 +387,7 @@ static void carl9170_tx_status_process_a
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 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 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 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 *a
}
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 @@ err_unlock:
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
* 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);
--
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