iwlwifi: implement txq invalidate byte count table

This is required to overcome a bug in 5000 HW byte count table.

Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

3 files changed, 28 insertions, 2 deletions

diff --git a/drivers/net/wireless/iwlwifi/iwl-5000.c b/drivers/net/wireless/iwlwifi/iwl-5000.c
index dc9f3b683795..6a10526d939b 100644
--- a/drivers/net/wireless/iwlwifi/iwl-5000.c
+++ b/drivers/net/wireless/iwlwifi/iwl-5000.c
@@ -955,6 +955,26 @@ static void iwl5000_txq_update_byte_cnt_tbl(struct iwl_priv *priv,
         }
 }
 
+static void iwl5000_txq_inval_byte_cnt_tbl(struct iwl_priv *priv,
+                                           struct iwl_tx_queue *txq)
+{
+        int txq_id = txq->q.id;
+        struct iwl5000_shared *shared_data = priv->shared_virt;
+        u8 sta = 0;
+
+        if (txq_id != IWL_CMD_QUEUE_NUM)
+                sta = txq->cmd[txq->q.read_ptr].cmd.tx.sta_id;
+
+        shared_data->queues_byte_cnt_tbls[txq_id].tfd_offset[txq->q.read_ptr].
+                                        val = cpu_to_le16(1 | (sta << 12));
+
+        if (txq->q.write_ptr < IWL50_MAX_WIN_SIZE) {
+                shared_data->queues_byte_cnt_tbls[txq_id].
+                        tfd_offset[IWL50_QUEUE_SIZE + txq->q.read_ptr].
+                                val = cpu_to_le16(1 | (sta << 12));
+        }
+}
+
 static u16 iwl5000_build_addsta_hcmd(const struct iwl_addsta_cmd *cmd, u8 *data)
 {
         u16 size = (u16)sizeof(struct iwl_addsta_cmd);
@@ -1248,6 +1268,7 @@ static struct iwl_lib_ops iwl5000_lib = {
         .free_shared_mem = iwl5000_free_shared_mem,
         .shared_mem_rx_idx = iwl5000_shared_mem_rx_idx,
         .txq_update_byte_cnt_tbl = iwl5000_txq_update_byte_cnt_tbl,
+        .txq_inval_byte_cnt_tbl = iwl5000_txq_inval_byte_cnt_tbl,
         .txq_set_sched = iwl5000_txq_set_sched,
         .rx_handler_setup = iwl5000_rx_handler_setup,
         .is_valid_rtc_data_addr = iwl5000_hw_valid_rtc_data_addr,
diff --git a/drivers/net/wireless/iwlwifi/iwl-core.h b/drivers/net/wireless/iwlwifi/iwl-core.h
index 8264b4e65857..1941a9184aa2 100644
--- a/drivers/net/wireless/iwlwifi/iwl-core.h
+++ b/drivers/net/wireless/iwlwifi/iwl-core.h
@@ -107,10 +107,12 @@ struct iwl_lib_ops {
         void (*txq_update_byte_cnt_tbl)(struct iwl_priv *priv,
                                         struct iwl_tx_queue *txq,
                                         u16 byte_cnt);
+        void (*txq_inval_byte_cnt_tbl)(struct iwl_priv *priv,
+                                       struct iwl_tx_queue *txq);
+        void (*txq_set_sched)(struct iwl_priv *priv, u32 mask);
         /* setup Rx handler */
         void (*rx_handler_setup)(struct iwl_priv *priv);
         /* nic Tx fifo handling */
-        void (*txq_set_sched)(struct iwl_priv *priv, u32 mask);
         /* alive notification after init uCode load */
         void (*init_alive_start)(struct iwl_priv *priv);
         /* alive notification */
diff --git a/drivers/net/wireless/iwlwifi/iwl-tx.c b/drivers/net/wireless/iwlwifi/iwl-tx.c
index b2b2ed29602a..224bcec21e5b 100644
--- a/drivers/net/wireless/iwlwifi/iwl-tx.c
+++ b/drivers/net/wireless/iwlwifi/iwl-tx.c
@@ -1080,8 +1080,11 @@ int iwl_tx_queue_reclaim(struct iwl_priv *priv, int txq_id, int index)
                 tx_info = &txq->txb[txq->q.read_ptr];
                 ieee80211_tx_status_irqsafe(priv->hw, tx_info->skb[0]);
                 tx_info->skb[0] = NULL;
-                iwl_hw_txq_free_tfd(priv, txq);
 
+                if (priv->cfg->ops->lib->txq_inval_byte_cnt_tbl)
+                        priv->cfg->ops->lib->txq_inval_byte_cnt_tbl(priv, txq);
+
+                iwl_hw_txq_free_tfd(priv, txq);
                 nfreed++;
         }
         return nfreed;