iwlwifi: allow configure protection mode

Even driver use rts/cts protection mode for aggregation packets by default.
Allow the protection mode to be configure through debugfs

Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>

diff --git a/drivers/net/wireless/iwlwifi/iwl-debugfs.c b/drivers/net/wireless/iwlwifi/iwl-debugfs.c
index 86017ed..e0b31a2 100644 (file)
--- a/drivers/net/wireless/iwlwifi/iwl-debugfs.c
+++ b/drivers/net/wireless/iwlwifi/iwl-debugfs.c
@@ -1604,6 +1604,44 @@ static ssize_t iwl_dbgfs_bt_traffic_read(struct file *file,
        return ret;
 }
 
+static ssize_t iwl_dbgfs_protection_mode_read(struct file *file,
+                                       char __user *user_buf,
+                                       size_t count, loff_t *ppos)
+{
+       struct iwl_priv *priv = (struct iwl_priv *)file->private_data;
+
+       int pos = 0;
+       char buf[40];
+       const size_t bufsz = sizeof(buf);
+
+       pos += scnprintf(buf + pos, bufsz - pos, "use %s for aggregation\n",
+                        (priv->cfg->use_rts_for_aggregation) ? "rts/cts" :
+                        "cts-to-self");
+       return simple_read_from_buffer(user_buf, count, ppos, buf, pos);
+}
+
+static ssize_t iwl_dbgfs_protection_mode_write(struct file *file,
+                                       const char __user *user_buf,
+                                       size_t count, loff_t *ppos) {
+
+       struct iwl_priv *priv = file->private_data;
+       char buf[8];
+       int buf_size;
+       int rts;
+
+       memset(buf, 0, sizeof(buf));
+       buf_size = min(count, sizeof(buf) -  1);
+       if (copy_from_user(buf, user_buf, buf_size))
+               return -EFAULT;
+       if (sscanf(buf, "%d", &rts) != 1)
+               return -EINVAL;
+       if (rts)
+               priv->cfg->use_rts_for_aggregation = true;
+       else
+               priv->cfg->use_rts_for_aggregation = false;
+       return count;
+}
+
 DEBUGFS_READ_FILE_OPS(rx_statistics);
 DEBUGFS_READ_FILE_OPS(tx_statistics);
 DEBUGFS_READ_WRITE_FILE_OPS(traffic_log);
@@ -1629,6 +1667,7 @@ DEBUGFS_WRITE_FILE_OPS(txfifo_flush);
 DEBUGFS_READ_FILE_OPS(ucode_bt_stats);
 DEBUGFS_WRITE_FILE_OPS(monitor_period);
 DEBUGFS_READ_FILE_OPS(bt_traffic);
+DEBUGFS_READ_WRITE_FILE_OPS(protection_mode);
 
 /*
  * Create the debugfs files and directories
@@ -1689,6 +1728,7 @@ int iwl_dbgfs_register(struct iwl_priv *priv, const char *name)
        DEBUGFS_ADD_FILE(ucode_general_stats, dir_debug, S_IRUSR);
        if (priv->cfg->ops->lib->dev_txfifo_flush)
                DEBUGFS_ADD_FILE(txfifo_flush, dir_debug, S_IWUSR);
+       DEBUGFS_ADD_FILE(protection_mode, dir_debug, S_IWUSR | S_IRUSR);
 
        if (priv->cfg->sensitivity_calib_by_driver)
                DEBUGFS_ADD_FILE(sensitivity, dir_debug, S_IRUSR);