iwlwifi: don't mess up QoS counters with non-QoS frames
Emmanuel Grumbach [Wed, 1 Feb 2012 15:01:32 +0000 (07:01 -0800)]
In my AMPDU rework, I rely on the sequence numbers of frames. But
I didn't check that the frame has a valid tid before updating the
tracking counters. As a result, the Tx queues were stalled. People
who hit this bug saw that we simply didn't let any data out.

This bug was introduced in 3.3.

This patch fixes that and checks that the frame is a QoS frame before
looking at its tid and changing the counters.

Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/iwlwifi/iwl-agn-tx.c
drivers/net/wireless/iwlwifi/iwl-commands.h
drivers/net/wireless/iwlwifi/iwl-trans-pcie.c

index 339e8d9..63bbc60 100644 (file)
@@ -91,6 +91,7 @@ static void iwlagn_tx_cmd_build_basic(struct iwl_priv *priv,
                tx_cmd->tid_tspec = qc[0] & 0xf;
                tx_flags &= ~TX_CMD_FLG_SEQ_CTL_MSK;
        } else {
+               tx_cmd->tid_tspec = IWL_TID_NON_QOS;
                if (info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ)
                        tx_flags |= TX_CMD_FLG_SEQ_CTL_MSK;
                else
@@ -808,6 +809,8 @@ static void iwl_rx_reply_tx_agg(struct iwl_priv *priv,
        u32 status = le16_to_cpu(tx_resp->status.status);
        int i;
 
+       WARN_ON(tid == IWL_TID_NON_QOS);
+
        if (agg->wait_for_ba)
                IWL_DEBUG_TX_REPLY(priv,
                        "got tx response w/o block-ack\n");
@@ -1035,10 +1038,13 @@ int iwlagn_rx_reply_tx(struct iwl_priv *priv, struct iwl_rx_mem_buffer *rxb,
                }
 
                __skb_queue_head_init(&skbs);
-               priv->tid_data[sta_id][tid].next_reclaimed = next_reclaimed;
 
-               IWL_DEBUG_TX_REPLY(priv, "Next reclaimed packet:%d",
-                                         next_reclaimed);
+               if (tid != IWL_TID_NON_QOS) {
+                       priv->tid_data[sta_id][tid].next_reclaimed =
+                               next_reclaimed;
+                       IWL_DEBUG_TX_REPLY(priv, "Next reclaimed packet:%d",
+                                                 next_reclaimed);
+               }
 
                /*we can free until ssn % q.n_bd not inclusive */
                WARN_ON(iwl_trans_reclaim(trans(priv), sta_id, tid, txq_id,
index 265de39..f822ac4 100644 (file)
@@ -815,6 +815,7 @@ struct iwl_qosparam_cmd {
 
 #define        IWL_INVALID_STATION     255
 #define IWL_MAX_TID_COUNT      8
+#define IWL_TID_NON_QOS IWL_MAX_TID_COUNT
 
 #define STA_FLG_TX_RATE_MSK            cpu_to_le32(1 << 2)
 #define STA_FLG_PWR_SAVE_MSK           cpu_to_le32(1 << 8)
index 67d6e32..324d06d 100644 (file)
@@ -1262,6 +1262,7 @@ static int iwl_trans_pcie_reclaim(struct iwl_trans *trans, int sta_id, int tid,
        txq->time_stamp = jiffies;
 
        if (unlikely(txq_id >= IWLAGN_FIRST_AMPDU_QUEUE &&
+                    tid != IWL_TID_NON_QOS &&
                     txq_id != trans_pcie->agg_txq[sta_id][tid])) {
                /*
                 * FIXME: this is a uCode bug which need to be addressed,