90c52e6f8f
Author: Gregory Nutt <gnutt@nuttx.org>
Run all .h and .c files modified in last PR through nxstyle.
Author: Xiang Xiao <xiaoxiang@xiaomi.com>
Net cleanup (#17)
* Fix the semaphore usage issue found in tcp/udp
1. The count semaphore need disable priority inheritance
2. Loop again if net_lockedwait return -EINTR
3. Call nxsem_trywait to avoid the race condition
4. Call nxsem_post instead of sem_post
* Put the work notifier into free list to avoid the heap fragment in the long run. Since the allocation strategy is encapsulated internally, we can even refine the implementation later.
* Network stack shouldn't allocate memory in the poll implementation to avoid the heap fragment in the long run, other modification include:
1. Select MM_IOB automatically since ICMP[v6] socket can't work without the read ahead buffer
2. Remove the net lock since xxx_callback_free already do the same thing
3. TCP/UDP poll should work even the read ahead buffer isn't enabled at all
* Add NET_ prefix for UDP_NOTIFIER and TCP_NOTIFIER option to align with other UDP/TCP option convention
* Remove the unused _SF_[IDLE|ACCEPT|SEND|RECV|MASK] flags since there are code to set/clear these flags, but nobody check them.
295 lines
8.7 KiB
C
295 lines
8.7 KiB
C
/****************************************************************************
|
|
* net/tcp/tcp_wrbuffer.c
|
|
*
|
|
* Copyright (C) 2007-2009, 2013-2014, 2018 Gregory Nutt. All rights
|
|
* reserved.
|
|
* Author: Gregory Nutt <gnutt@nuttx.org>
|
|
* Jason Jiang <jasonj@live.cn>
|
|
*
|
|
* 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/netconfig.h>
|
|
|
|
#if defined(CONFIG_DEBUG_FEATURES) && defined(CONFIG_NET_TCP_WRBUFFER_DEBUG)
|
|
/* Force debug output (from this file only) */
|
|
|
|
# undef CONFIG_DEBUG_NET
|
|
# define CONFIG_DEBUG_NET 1
|
|
#endif
|
|
|
|
#include <queue.h>
|
|
#include <string.h>
|
|
#include <assert.h>
|
|
#include <errno.h>
|
|
#include <debug.h>
|
|
|
|
#include <nuttx/semaphore.h>
|
|
#include <nuttx/net/net.h>
|
|
#include <nuttx/mm/iob.h>
|
|
|
|
#include "utils/utils.h"
|
|
#include "tcp/tcp.h"
|
|
|
|
#if defined(CONFIG_NET_TCP) && defined(CONFIG_NET_TCP_WRITE_BUFFERS)
|
|
|
|
/****************************************************************************
|
|
* Private Types
|
|
****************************************************************************/
|
|
|
|
/* Package all globals used by this logic into a structure */
|
|
|
|
struct wrbuffer_s
|
|
{
|
|
/* The semaphore to protect the buffers */
|
|
|
|
sem_t sem;
|
|
|
|
/* This is the list of available write buffers */
|
|
|
|
sq_queue_t freebuffers;
|
|
|
|
/* These are the pre-allocated write buffers */
|
|
|
|
struct tcp_wrbuffer_s buffers[CONFIG_NET_TCP_NWRBCHAINS];
|
|
};
|
|
|
|
/****************************************************************************
|
|
* Private Data
|
|
****************************************************************************/
|
|
|
|
/* This is the state of the global write buffer resource */
|
|
|
|
static struct wrbuffer_s g_wrbuffer;
|
|
|
|
/****************************************************************************
|
|
* Public Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Name: tcp_wrbuffer_initialize
|
|
*
|
|
* Description:
|
|
* Initialize the list of free write buffers
|
|
*
|
|
* Assumptions:
|
|
* Called once early initialization.
|
|
*
|
|
****************************************************************************/
|
|
|
|
void tcp_wrbuffer_initialize(void)
|
|
{
|
|
int i;
|
|
|
|
sq_init(&g_wrbuffer.freebuffers);
|
|
|
|
for (i = 0; i < CONFIG_NET_TCP_NWRBCHAINS; i++)
|
|
{
|
|
sq_addfirst(&g_wrbuffer.buffers[i].wb_node, &g_wrbuffer.freebuffers);
|
|
}
|
|
|
|
nxsem_init(&g_wrbuffer.sem, 0, CONFIG_NET_TCP_NWRBCHAINS);
|
|
nxsem_setprotocol(&g_wrbuffer.sem, SEM_PRIO_NONE);
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Name: tcp_wrbuffer_alloc
|
|
*
|
|
* Description:
|
|
* Allocate a TCP write buffer by taking a pre-allocated buffer from
|
|
* the free list. This function is called from TCP logic when a buffer
|
|
* of TCP data is about to sent
|
|
*
|
|
* Input Parameters:
|
|
* None
|
|
*
|
|
* Assumptions:
|
|
* Called from user logic with the network locked.
|
|
*
|
|
****************************************************************************/
|
|
|
|
FAR struct tcp_wrbuffer_s *tcp_wrbuffer_alloc(void)
|
|
{
|
|
FAR struct tcp_wrbuffer_s *wrb;
|
|
|
|
/* We need to allocate two things: (1) A write buffer structure and (2)
|
|
* at least one I/O buffer to start the chain.
|
|
*
|
|
* Allocate the write buffer structure first then the IOB. In order to
|
|
* avoid deadlocks, we will need to free the IOB first, then the write
|
|
* buffer
|
|
*/
|
|
|
|
while (net_lockedwait(&g_wrbuffer.sem) < 0);
|
|
|
|
/* Now, we are guaranteed to have a write buffer structure reserved
|
|
* for us in the free list.
|
|
*/
|
|
|
|
wrb = (FAR struct tcp_wrbuffer_s *)sq_remfirst(&g_wrbuffer.freebuffers);
|
|
DEBUGASSERT(wrb);
|
|
memset(wrb, 0, sizeof(struct tcp_wrbuffer_s));
|
|
|
|
/* Now get the first I/O buffer for the write buffer structure */
|
|
|
|
wrb->wb_iob = net_ioballoc(false, IOBUSER_NET_TCP_WRITEBUFFER);
|
|
|
|
/* Did we get an IOB? We should always get one except under some really
|
|
* weird error conditions.
|
|
*/
|
|
|
|
if (wrb->wb_iob == NULL)
|
|
{
|
|
nerr("ERROR: Failed to allocate I/O buffer\n");
|
|
tcp_wrbuffer_release(wrb);
|
|
return NULL;
|
|
}
|
|
|
|
return wrb;
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Name: tcp_wrbuffer_tryalloc
|
|
*
|
|
* Description:
|
|
* Try to allocate a TCP write buffer by taking a pre-allocated buffer from
|
|
* the free list. This function is called from TCP logic when a buffer
|
|
* of TCP data is about to be sent on a non-blocking socket. Returns
|
|
* immediately if the allocation failed.
|
|
*
|
|
* Input parameters:
|
|
* None
|
|
*
|
|
* Assumptions:
|
|
* Called from user logic with the network locked. Will return if no buffer
|
|
* is available.
|
|
*
|
|
****************************************************************************/
|
|
|
|
FAR struct tcp_wrbuffer_s *tcp_wrbuffer_tryalloc(void)
|
|
{
|
|
FAR struct tcp_wrbuffer_s *wrb;
|
|
|
|
/* We need to allocate two things: (1) A write buffer structure and (2)
|
|
* at least one I/O buffer to start the chain.
|
|
*
|
|
* Allocate the write buffer structure first then the IOBG. In order to
|
|
* avoid deadlocks, we will need to free the IOB first, then the write
|
|
* buffer
|
|
*/
|
|
|
|
if (nxsem_trywait(&g_wrbuffer.sem) != OK)
|
|
{
|
|
return NULL;
|
|
}
|
|
|
|
/* Now, we are guaranteed to have a write buffer structure reserved
|
|
* for us in the free list.
|
|
*/
|
|
|
|
wrb = (FAR struct tcp_wrbuffer_s *)sq_remfirst(&g_wrbuffer.freebuffers);
|
|
DEBUGASSERT(wrb);
|
|
memset(wrb, 0, sizeof(struct tcp_wrbuffer_s));
|
|
|
|
/* Now get the first I/O buffer for the write buffer structure */
|
|
|
|
wrb->wb_iob = iob_tryalloc(false, IOBUSER_NET_TCP_WRITEBUFFER);
|
|
if (!wrb->wb_iob)
|
|
{
|
|
nerr("ERROR: Failed to allocate I/O buffer\n");
|
|
tcp_wrbuffer_release(wrb);
|
|
return NULL;
|
|
}
|
|
|
|
return wrb;
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Name: tcp_wrbuffer_release
|
|
*
|
|
* Description:
|
|
* Release a TCP write buffer by returning the buffer to the free list.
|
|
* This function is called from user logic after it is consumed the
|
|
* buffered data.
|
|
*
|
|
* Assumptions:
|
|
* This function must be called with the network locked.
|
|
*
|
|
****************************************************************************/
|
|
|
|
void tcp_wrbuffer_release(FAR struct tcp_wrbuffer_s *wrb)
|
|
{
|
|
DEBUGASSERT(wrb != NULL);
|
|
|
|
/* To avoid deadlocks, we must following this ordering: Release the I/O
|
|
* buffer chain first, then the write buffer structure.
|
|
*/
|
|
|
|
if (wrb->wb_iob != NULL)
|
|
{
|
|
iob_free_chain(wrb->wb_iob, IOBUSER_NET_TCP_WRITEBUFFER);
|
|
}
|
|
|
|
/* Then free the write buffer structure */
|
|
|
|
sq_addlast(&wrb->wb_node, &g_wrbuffer.freebuffers);
|
|
nxsem_post(&g_wrbuffer.sem);
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Name: tcp_wrbuffer_test
|
|
*
|
|
* Description:
|
|
* Check if there is room in the write buffer. Does not reserve any space.
|
|
*
|
|
* Assumptions:
|
|
* None.
|
|
*
|
|
****************************************************************************/
|
|
|
|
int tcp_wrbuffer_test(void)
|
|
{
|
|
int val = 0;
|
|
int ret;
|
|
|
|
ret = nxsem_getvalue(&g_wrbuffer.sem, &val);
|
|
if (ret >= 0)
|
|
{
|
|
ret = val > 0 ? OK : -ENOSPC;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
#endif /* CONFIG_NET_TCP && CONFIG_NET_TCP_WRITE_BUFFERS */
|