1 files changed, 130 insertions, 0 deletions
diff --git a/nuttx/net/uip/uip_tcpreadahead.c b/nuttx/net/uip/uip_tcpreadahead.c
new file mode 100644
index 000000000..21ed58b99
--- /dev/null
+++ b/nuttx/net/uip/uip_tcpreadahead.c
@@ -0,0 +1,130 @@
+/****************************************************************************
+ * net/uip/uip_tcpreadahead.c
+ *
+ *   Copyright (C) 2007-2009 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/net/uip/uipopt.h>
+#if defined(CONFIG_NET) && defined(CONFIG_NET_TCP) && (CONFIG_NET_NTCP_READAHEAD_BUFFERS > 0)
+
+#include <queue.h>
+#include <debug.h>
+
+#include <nuttx/net/uip/uip.h>
+
+#include "uip_internal.h"
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+/* These are the pre-allocated read-ahead buffers */
+
+static struct uip_readahead_s g_buffers[CONFIG_NET_NTCP_READAHEAD_BUFFERS];
+
+/* This is the list of available read-ahead buffers */
+
+static sq_queue_t g_freebuffers;
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Function: uip_tcpreadaheadinit
+ *
+ * Description:
+ *   Initialize the list of free read-ahead buffers
+ *
+ * Assumptions:
+ *   Called once early initialization.
+ *
+ ****************************************************************************/
+
+void uip_tcpreadaheadinit(void)
+{
+  int i;
+
+  sq_init(&g_freebuffers);
+  for (i = 0; i < CONFIG_NET_NTCP_READAHEAD_BUFFERS; i++)
+    {
+      sq_addfirst(&g_buffers[i].rh_node, &g_freebuffers);
+    }
+}
+
+/****************************************************************************
+ * Function: uip_tcpreadaheadalloc
+ *
+ * Description:
+ *   Allocate a TCP read-ahead buffer by taking a pre-allocated buffer from
+ *   the free list.  This function is called from TCP logic when new,
+ *   incoming TCP data is received but there is no user logic recving the
+ *   the data.  Note: malloc() cannot be used because this function is
+ *   called from interrupt level.
+ *
+ * Assumptions:
+ *   Called from interrupt level with interrupts disabled.
+ *
+ ****************************************************************************/
+
+struct uip_readahead_s *uip_tcpreadaheadalloc(void)
+{
+  return (struct uip_readahead_s*)sq_remfirst(&g_freebuffers);
+}
+
+/****************************************************************************
+ * Function: uip_tcpreadaheadrelease
+ *
+ * Description:
+ *   Release a TCP read-ahead buffer by returning the buffer to the free list.
+ *   This function is called from user logic after it is consumed the buffered
+ *   data.
+ *
+ * Assumptions:
+ *   Called from user logic BUT with interrupts disabled.
+ *
+ ****************************************************************************/
+
+void uip_tcpreadaheadrelease(struct uip_readahead_s *buf)
+{
+  sq_addfirst(&buf->rh_node, &g_freebuffers);
+}
+
+#endif /* CONFIG_NET && CONFIG_NET_TCP && CONFIG_NET_NTCP_READAHEAD_BUFFERS*/