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Diffstat (limited to 'nuttx/net/uip/uip-tcpreadahead.c')
-rw-r--r-- | nuttx/net/uip/uip-tcpreadahead.c | 132 |
1 files changed, 132 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..6c4c78f1e --- /dev/null +++ b/nuttx/net/uip/uip-tcpreadahead.c @@ -0,0 +1,132 @@ +/**************************************************************************** + * net/uip/uip-tcpreadahead.c + * + * Copyright (C) 2007 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 <net/uip/uipopt.h> +#if defined(CONFIG_NET) && (CONFIG_NET_NTCP_READAHEAD_BUFFERS > 0) + +#include <sys/types.h> +#include <queue.h> +#include <debug.h> + +#include <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_NTCP_READAHEAD_BUFFERS*/ |