wimax/i2400m: reserve additional space in the TX queue's buffer while allocating...

Increase the possibilities of including at least one payload by reserving
some additional space in the TX queue while allocating TX queue's space
for new message header. Please refer the documentation in the code for details.

Signed-off-by: Prasanna S. Panchamukhi <prasannax.s.panchamukhi@intel.com>

diff --git a/drivers/net/wimax/i2400m/i2400m.h b/drivers/net/wimax/i2400m/i2400m.h
index b8c7dbfead498a3b04b77165baf9c7ece39e7792..1babc55b131224ea39a3285bdf26c2b9b52f3053 100644 (file)
--- a/drivers/net/wimax/i2400m/i2400m.h
+++ b/drivers/net/wimax/i2400m/i2400m.h
@@ -242,6 +242,11 @@ struct i2400m_barker_db;
  *     so we have a tx_blk_size variable that the bus layer sets to
  *     tell the engine how much of that we need.
  *
+ * @bus_tx_room_min: [fill] Minimum room required while allocating
+ *     TX queue's buffer space for message header. SDIO requires
+ *     224 bytes and USB 16 bytes. Refer bus specific driver code
+ *     for details.
+ *
  * @bus_pl_size_max: [fill] Maximum payload size.
  *
  * @bus_setup: [optional fill] Function called by the bus-generic code
@@ -573,6 +578,7 @@ struct i2400m {
        wait_queue_head_t state_wq;     /* Woken up when on state updates */
 
        size_t bus_tx_block_size;
+       size_t bus_tx_room_min;
        size_t bus_pl_size_max;
        unsigned bus_bm_retries;
 

diff --git a/drivers/net/wimax/i2400m/tx.c b/drivers/net/wimax/i2400m/tx.c
index 609f1ca6e9fc98737f96fda7f879b0a6f0f0448d..3f819efc06b597b46f4f1a60b52cad88f9bf7e72 100644 (file)
--- a/drivers/net/wimax/i2400m/tx.c
+++ b/drivers/net/wimax/i2400m/tx.c
@@ -563,8 +563,17 @@ void i2400m_tx_new(struct i2400m *i2400m)
        struct i2400m_msg_hdr *tx_msg;
        bool try_head = 0;
        BUG_ON(i2400m->tx_msg != NULL);
+       /*
+        * In certain situations, TX queue might have enough space to
+        * accommodate the new message header I2400M_TX_PLD_SIZE, but
+        * might not have enough space to accommodate the payloads.
+        * Adding bus_tx_room_min padding while allocating a new TX message
+        * increases the possibilities of including at least one payload of the
+        * size <= bus_tx_room_min.
+        */
 try_head:
-       tx_msg = i2400m_tx_fifo_push(i2400m, I2400M_TX_PLD_SIZE, 0, try_head);
+       tx_msg = i2400m_tx_fifo_push(i2400m, I2400M_TX_PLD_SIZE,
+                                    i2400m->bus_tx_room_min, try_head);
        if (tx_msg == NULL)
                goto out;
        else if (tx_msg == TAIL_FULL) {