iwlwifi: move tx reclaim flow into iwl-tx

This patch
1. moves TX reclaim flow into iwl-tx
2. separates command queue and tx queue reclaim flow

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

1 files changed, 108 insertions, 0 deletions

diff --git a/drivers/net/wireless/iwlwifi/iwl-tx.c b/drivers/net/wireless/iwlwifi/iwl-tx.c
index 885a4c11ac49..b2b2ed29602a 100644
--- a/drivers/net/wireless/iwlwifi/iwl-tx.c
+++ b/drivers/net/wireless/iwlwifi/iwl-tx.c
@@ -1060,6 +1060,114 @@ int iwl_enqueue_hcmd(struct iwl_priv *priv, struct iwl_host_cmd *cmd)
         return ret ? ret : idx;
 }
 
+int iwl_tx_queue_reclaim(struct iwl_priv *priv, int txq_id, int index)
+{
+        struct iwl_tx_queue *txq = &priv->txq[txq_id];
+        struct iwl_queue *q = &txq->q;
+        struct iwl_tx_info *tx_info;
+        int nfreed = 0;
+
+        if ((index >= q->n_bd) || (iwl_queue_used(q, index) == 0)) {
+                IWL_ERROR("Read index for DMA queue txq id (%d), index %d, "
+                          "is out of range [0-%d] %d %d.\n", txq_id,
+                          index, q->n_bd, q->write_ptr, q->read_ptr);
+                return 0;
+        }
+
+        for (index = iwl_queue_inc_wrap(index, q->n_bd); q->read_ptr != index;
+                q->read_ptr = iwl_queue_inc_wrap(q->read_ptr, q->n_bd)) {
+
+                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);
+
+                nfreed++;
+        }
+        return nfreed;
+}
+EXPORT_SYMBOL(iwl_tx_queue_reclaim);
+
+
+/**
+ * iwl_hcmd_queue_reclaim - Reclaim TX command queue entries already Tx'd
+ *
+ * When FW advances 'R' index, all entries between old and new 'R' index
+ * need to be reclaimed. As result, some free space forms.  If there is
+ * enough free space (> low mark), wake the stack that feeds us.
+ */
+static void iwl_hcmd_queue_reclaim(struct iwl_priv *priv, int txq_id, int index)
+{
+        struct iwl_tx_queue *txq = &priv->txq[txq_id];
+        struct iwl_queue *q = &txq->q;
+        int nfreed = 0;
+
+        if ((index >= q->n_bd) || (iwl_queue_used(q, index) == 0)) {
+                IWL_ERROR("Read index for DMA queue txq id (%d), index %d, "
+                          "is out of range [0-%d] %d %d.\n", txq_id,
+                          index, q->n_bd, q->write_ptr, q->read_ptr);
+                return;
+        }
+
+        for (index = iwl_queue_inc_wrap(index, q->n_bd); q->read_ptr != index;
+                q->read_ptr = iwl_queue_inc_wrap(q->read_ptr, q->n_bd)) {
+
+                if (nfreed > 1) {
+                        IWL_ERROR("HCMD skipped: index (%d) %d %d\n", index,
+                                        q->write_ptr, q->read_ptr);
+                        queue_work(priv->workqueue, &priv->restart);
+                }
+                nfreed++;
+        }
+}
+
+/**
+ * iwl_tx_cmd_complete - Pull unused buffers off the queue and reclaim them
+ * @rxb: Rx buffer to reclaim
+ *
+ * If an Rx buffer has an async callback associated with it the callback
+ * will be executed.  The attached skb (if present) will only be freed
+ * if the callback returns 1
+ */
+void iwl_tx_cmd_complete(struct iwl_priv *priv, struct iwl_rx_mem_buffer *rxb)
+{
+        struct iwl_rx_packet *pkt = (struct iwl_rx_packet *)rxb->skb->data;
+        u16 sequence = le16_to_cpu(pkt->hdr.sequence);
+        int txq_id = SEQ_TO_QUEUE(sequence);
+        int index = SEQ_TO_INDEX(sequence);
+        int huge = sequence & SEQ_HUGE_FRAME;
+        int cmd_index;
+        struct iwl_cmd *cmd;
+
+        /* If a Tx command is being handled and it isn't in the actual
+         * command queue then there a command routing bug has been introduced
+         * in the queue management code. */
+        if (txq_id != IWL_CMD_QUEUE_NUM)
+                IWL_ERROR("Error wrong command queue %d command id 0x%X\n",
+                          txq_id, pkt->hdr.cmd);
+        BUG_ON(txq_id != IWL_CMD_QUEUE_NUM);
+
+        cmd_index = get_cmd_index(&priv->txq[IWL_CMD_QUEUE_NUM].q, index, huge);
+        cmd = &priv->txq[IWL_CMD_QUEUE_NUM].cmd[cmd_index];
+
+        /* Input error checking is done when commands are added to queue. */
+        if (cmd->meta.flags & CMD_WANT_SKB) {
+                cmd->meta.source->u.skb = rxb->skb;
+                rxb->skb = NULL;
+        } else if (cmd->meta.u.callback &&
+                   !cmd->meta.u.callback(priv, cmd, rxb->skb))
+                rxb->skb = NULL;
+
+        iwl_hcmd_queue_reclaim(priv, txq_id, index);
+
+        if (!(cmd->meta.flags & CMD_ASYNC)) {
+                clear_bit(STATUS_HCMD_ACTIVE, &priv->status);
+                wake_up_interruptible(&priv->wait_command_queue);
+        }
+}
+EXPORT_SYMBOL(iwl_tx_cmd_complete);
+
+
 #ifdef CONFIG_IWLWIF_DEBUG
 #define TX_STATUS_ENTRY(x) case TX_STATUS_FAIL_ ## x: return #x