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The first set of changes to incorporate Jason Jiangs TCP write buffering logic

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This commit is contained in:
Gregory Nutt 2014-01-13 17:11:01 -06:00
parent 486314ad05
commit a9e44cdfe0
14 changed files with 1488 additions and 629 deletions
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6
ChangeLog
View File

@ -6422,3 +6422,9 @@
the changes does not seem to do any harm (2014-1-13).
* net/connect.c and net/uip/uip_callback.c: prevent tcp_connect
callback from being double freed. From Max Holtzberg (2014-1-13).
* net/Kconfig and include/nuttx/net/uip/uipopt.h: Add configuration
support for forthcoming TCP write buffering (2014-1-13).
* net/net_send_buffered.c, net_send_unbuffered.c, and
uip/uip_tcpwrbuffer.c: First set of changes to bring in Jason
Jiang's TCP write buffering logic. Still not complete but
apparently harmless if not selected. (2014-1-13).

10
include/nuttx/net/net.h
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@ -51,7 +51,7 @@
#include <nuttx/net/uip/uip.h>
/****************************************************************************
* Definitions
* Pre-processor Definitions
****************************************************************************/
/* Socket descriptors are the index into the TCB sockets list, offset by the
@ -101,6 +101,12 @@ struct socket
#endif
#endif
FAR void *s_conn; /* Connection: struct uip_conn or uip_udp_conn */
#ifdef CONFIG_NET_TCP_WRBUFFER
/* Callback instance for TCP send */
FAR struct uip_callback_s *s_sndcb;
#endif
};
/* This defines a list of sockets indexed by the socket descriptor */
@ -108,7 +114,7 @@ struct socket
#if CONFIG_NSOCKET_DESCRIPTORS > 0
struct socketlist
{
sem_t sl_sem; /* Manage access to the socket list */
sem_t sl_sem; /* Manage access to the socket list */
struct socket sl_sockets[CONFIG_NSOCKET_DESCRIPTORS];
};
#endif

84
include/nuttx/net/uip/uip-tcp.h
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@ -144,15 +144,9 @@ struct uip_conn
{
dq_entry_t node; /* Implements a doubly linked list */
uip_ipaddr_t ripaddr; /* The IP address of the remote host */
uint16_t lport; /* The local TCP port, in network byte order */
uint16_t rport; /* The remoteTCP port, in network byte order */
uint8_t rcvseq[4]; /* The sequence number that we expect to
* receive next */
uint8_t sndseq[4]; /* The sequence number that was last sent by us */
uint16_t unacked; /* Number bytes sent but not yet ACKed */
uint16_t mss; /* Current maximum segment size for the
* connection */
uint16_t winsize; /* Current window size of the connection */
uint8_t crefs; /* Reference counts on this instance */
uint8_t sa; /* Retransmission time-out calculation state
* variable */
@ -163,6 +157,16 @@ struct uip_conn
uint8_t timer; /* The retransmission timer (units: half-seconds) */
uint8_t nrtx; /* The number of retransmissions for the last
* segment sent */
uint16_t lport; /* The local TCP port, in network byte order */
uint16_t rport; /* The remoteTCP port, in network byte order */
uint16_t mss; /* Current maximum segment size for the
* connection */
uint16_t winsize; /* Current window size of the connection */
#ifdef CONFIG_NET_TCP_WRBUFFER
uint32_t unacked; /* Number bytes sent but not yet ACKed */
#else
uint16_t unacked; /* Number bytes sent but not yet ACKed */
#endif
/* Read-ahead buffering.
*
@ -174,6 +178,17 @@ struct uip_conn
sq_queue_t readahead; /* Read-ahead buffering */
#endif
/* Write buffering */
#ifdef CONFIG_NET_TCP_WRITE_BUFFERS
sq_queue_t write_q; /* Write buffering for segments */
sq_queue_t unacked_q; /* Write buffering for un-ACKed segments */
size_t expired; /* Number segments retransmitted but not yet ACKed,
* it can only be updated at UIP_ESTABLISHED state */
size_t sent; /* The number of bytes sent */
uint32_t isn; /* Initial sequence number */
#endif
/* Listen backlog support
*
* blparent - The backlog parent. If this connection is backlogged,
@ -238,8 +253,22 @@ struct uip_conn
struct uip_readahead_s
{
sq_entry_t rh_node; /* Supports a singly linked list */
uint16_t rh_nbytes; /* Number of bytes available in this buffer */
uint8_t rh_buffer[CONFIG_NET_TCP_READAHEAD_BUFSIZE];
uint16_t rh_nbytes; /* Number of bytes available in this buffer */
uint8_t rh_buffer[CONFIG_NET_TCP_READAHEAD_BUFSIZE];
};
#endif
/* This structure supports TCP write buffering */
#ifdef CONFIG_NET_TCP_WRITE_BUFFERS
struct uip_wrbuffer_s
{
sq_entry_t wb_node; /* Supports a singly linked list */
uint32_t wb_seqno; /* Sequence number of the write segment */
uint16_t wb_nbytes; /* Number of bytes available in this buffer */
uint8_t wb_nrtx; /* The number of retransmissions for the last
* segment sent */
uint8_t wb_buffer[CONFIG_NET_TCP_WRITE_BUFSIZE];
};
#endif
@ -350,7 +379,7 @@ struct uip_tcpip_hdr
* normally something done by the implementation of the socket() API
*/
extern struct uip_conn *uip_tcpalloc(void);
struct uip_conn *uip_tcpalloc(void);
/* Allocate a new TCP data callback */
@ -361,14 +390,14 @@ extern struct uip_conn *uip_tcpalloc(void);
* be done by the implementation of close()
*/
extern void uip_tcpfree(struct uip_conn *conn);
void uip_tcpfree(struct uip_conn *conn);
/* Bind a TCP connection to a local address */
#ifdef CONFIG_NET_IPv6
extern int uip_tcpbind(struct uip_conn *conn, const struct sockaddr_in6 *addr);
int uip_tcpbind(struct uip_conn *conn, const struct sockaddr_in6 *addr);
#else
extern int uip_tcpbind(struct uip_conn *conn, const struct sockaddr_in *addr);
int uip_tcpbind(struct uip_conn *conn, const struct sockaddr_in *addr);
#endif
/* This function implements the UIP specific parts of the standard
@ -386,44 +415,51 @@ extern int uip_tcpbind(struct uip_conn *conn, const struct sockaddr_in *addr);
*/
#ifdef CONFIG_NET_IPv6
extern int uip_tcpconnect(struct uip_conn *conn, const struct sockaddr_in6 *addr);
int uip_tcpconnect(struct uip_conn *conn, const struct sockaddr_in6 *addr);
#else
extern int uip_tcpconnect(struct uip_conn *conn, const struct sockaddr_in *addr);
int uip_tcpconnect(struct uip_conn *conn, const struct sockaddr_in *addr);
#endif
/* Start listening to the port bound to the specified TCP connection */
extern int uip_listen(struct uip_conn *conn);
int uip_listen(struct uip_conn *conn);
/* Stop listening to the port bound to the specified TCP connection */
extern int uip_unlisten(struct uip_conn *conn);
int uip_unlisten(struct uip_conn *conn);
/* Access to TCP read-ahead buffers */
#ifdef CONFIG_NET_TCP_READAHEAD
extern struct uip_readahead_s *uip_tcpreadaheadalloc(void);
extern void uip_tcpreadaheadrelease(struct uip_readahead_s *buf);
struct uip_readahead_s *uip_tcpreadaheadalloc(void);
void uip_tcpreadaheadrelease(struct uip_readahead_s *buf);
#endif /* CONFIG_NET_TCP_READAHEAD */
/* Access to TCP write buffers */
#ifdef CONFIG_NET_TCP_WRITE_BUFFERS
FAR struct uip_wrbuffer_s *uip_tcpwrbuffer_alloc(FAR const struct timespec *abstime);
void uip_tcpwrbuffer_release(FAR struct uip_wrbuffer_s *buf);
#endif /* CONFIG_NET_NTCP_READAHEAD_BUFFERS */
/* Backlog support */
#ifdef CONFIG_NET_TCPBACKLOG
/* APIs to create and terminate TCP backlog support */
extern int uip_backlogcreate(FAR struct uip_conn *conn, int nblg);
extern int uip_backlogdestroy(FAR struct uip_conn *conn);
int uip_backlogcreate(FAR struct uip_conn *conn, int nblg);
int uip_backlogdestroy(FAR struct uip_conn *conn);
/* APIs to manage individual backlog actions */
extern int uip_backlogadd(FAR struct uip_conn *conn, FAR struct uip_conn *blconn);
int uip_backlogadd(FAR struct uip_conn *conn, FAR struct uip_conn *blconn);
#ifndef CONFIG_DISABLE_POLL
extern bool uip_backlogavailable(FAR struct uip_conn *conn);
bool uip_backlogavailable(FAR struct uip_conn *conn);
#else
# define uip_backlogavailable(conn) (false);
#endif
extern FAR struct uip_conn *uip_backlogremove(FAR struct uip_conn *conn);
extern int uip_backlogdelete(FAR struct uip_conn *conn, FAR struct uip_conn *blconn);
FAR struct uip_conn *uip_backlogremove(FAR struct uip_conn *conn);
int uip_backlogdelete(FAR struct uip_conn *conn, FAR struct uip_conn *blconn);
#else
# define uip_backlogcreate(conn,nblg) (-ENOSYS)

2
include/nuttx/net/uip/uipopt.h
View File

@ -16,7 +16,7 @@
* Note: Most of the configuration options in the uipopt.h should not
* be changed, but rather the per-project defconfig file.
*
* Copyright (C) 2007, 2011 Gregory Nutt. All rights reserved.
* Copyright (C) 2007, 2011, 2014 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* This logic was leveraged from uIP which also has a BSD-style license:

3
net/Kconfig
View File

@ -75,7 +75,7 @@ config NET_SOCKOPTS
config NET_SOLINGER
bool "SO_LINGER socket option"
default n
depends on NET_SOCKOPTS && !DISABLE_CLOCK
depends on NET_SOCKOPTS && NET_TCP_WRITE_BUFFERS && !DISABLE_CLOCK
---help---
Enable or disable support for the SO_LINGER socket option.
@ -210,6 +210,7 @@ config NET_TCPBACKLOG
config NET_TCP_SPLIT
bool "Enable packet splitting"
default n
depends on !NET_TCP_WRITE_BUFFERS
---help---
send() will not return until the transfer has been ACKed by the
recipient. But under RFC 1122, the host need not ACK each packet

10
net/Makefile
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@ -1,7 +1,7 @@
############################################################################
# net/Makefile
#
# Copyright (C) 2007, 2008, 2011-2013 Gregory Nutt. All rights reserved.
# Copyright (C) 2007, 2008, 2011-2014 Gregory Nutt. All rights reserved.
# Author: Gregory Nutt <gnutt@nuttx.org>
#
# Redistribution and use in source and binary forms, with or without
@ -41,13 +41,19 @@ ifeq ($(CONFIG_NET),y)
SOCK_ASRCS =
SOCK_CSRCS = bind.c connect.c getsockname.c recv.c recvfrom.c socket.c
SOCK_CSRCS += sendto.c net_sockets.c net_close.c net_dup.c net_dup2.c
SOCK_CSRCS += sendto.c net_sockets.c net_close.c net_dup.c net_dup2.c
SOCK_CSRCS += net_clone.c net_vfcntl.c
# TCP/IP support
ifeq ($(CONFIG_NET_TCP),y)
SOCK_CSRCS += send.c listen.c accept.c net_monitor.c
ifeq ($(CONFIG_NET_TCP_WRBUFFER),y)
SOCK_CSRCS += net_send_buffered.c
else
SOCK_CSRCS += net_send_unbuffered.c
endif
endif
# Socket options

9
net/net_close.c
View File

@ -196,8 +196,7 @@ static uint16_t netclose_interrupt(FAR struct uip_driver_s *dev,
}
}
#ifdef CONFIG_NET_SOLINGER
#ifndef CONFIG_DISABLE_CLOCK
#if defined(CONFIG_NET_SOLINGER) && !defined(CONFIG_DISABLE_CLOCK)
/* Check for a timeout. */
else if (pstate && close_timeout(pstate))
@ -208,8 +207,10 @@ static uint16_t netclose_interrupt(FAR struct uip_driver_s *dev,
pstate->cl_result = -ETIMEDOUT;
goto end_wait;
}
#endif /* CONFIG_DISABLE_CLOCK */
#endif /* CONFIG_NET_SOLINGER && !CONFIG_DISABLE_CLOCK */
#ifdef CONFIG_NET_TCP_WRITE_BUFFERS
/* Check if all outstanding bytes have been ACKed */
else if (pstate && conn->unacked != 0)
@ -222,7 +223,7 @@ static uint16_t netclose_interrupt(FAR struct uip_driver_s *dev,
flags = (flags & ~UIP_NEWDATA);
}
#endif /* CONFIG_NET_SOLINGER */
#endif /* CONFIG_NET_TCP_WRITE_BUFFERS */
else
{

557
net/net_send_buffered.c Normal file
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@ -0,0 +1,557 @@
/****************************************************************************
* net/net_send_buffered.c
*
* Copyright (C) 2007-2014 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/config.h>
#if defined(CONFIG_NET) && defined(CONFIG_NET_TCP) && \
defined(CONFIG_NET_TCP_WRITE_BUFFERS)
#include <sys/types.h>
#include <sys/socket.h>
#include <stdint.h>
#include <stdbool.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <debug.h>
#include <debug.h>
#include <arch/irq.h>
#include <nuttx/clock.h>
#include <nuttx/net/uip/uip-arp.h>
#include <nuttx/net/uip/uip-arch.h>
#ifdef CONFIG_NET_ARP_IPIN
# include <nuttx/net/uip/uip-arp.h>
#endif
#include "net_internal.h"
#include "uip/uip_internal.h"
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
#define TCPBUF ((struct uip_tcpip_hdr *)&dev->d_buf[UIP_LLH_LEN])
/****************************************************************************
* Private Types
****************************************************************************/
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Function: send_insert_seqment
*
* Description:
* Inserted a new segment in a write buffer, keep the segment queue in
* ascending order of seqno
*
* Parameters:
* pstate send state structure
*
* Returned Value:
* TRUE:timeout FALSE:no timeout
*
* Assumptions:
* Running at the interrupt level
*
****************************************************************************/
static void send_insert_seqment(FAR struct uip_write_s *segment,
FAR sq_queue_t *q)
{
sq_entry_t *entry = (sq_entry_t*)segment;
sq_entry_t *insert = NULL;
sq_entry_t *itr;
for (itr = sq_peek(q); itr; itr = sq_next(itr))
{
FAR struct uip_write_s *segment0 = (FAR struct uip_write_s*)itr;
if (segment0->wb_seqno < segment->wb_seqno)
{
insert = itr;
}
else
{
break;
}
}
if (insert)
{
sq_addafter(insert, entry, q);
}
else
{
sq_addfirst(entry, q);
}
}
/****************************************************************************
* Function: send_interrupt
*
* Description:
* This function is called from the interrupt level to perform the actual
* send operation when polled by the uIP layer.
*
* Parameters:
* dev The structure of the network driver that caused the interrupt
* conn The connection structure associated with the socket
* flags Set of events describing why the callback was invoked
*
* Returned Value:
* None
*
* Assumptions:
* Running at the interrupt level
*
****************************************************************************/
static uint16_t send_interrupt(FAR struct uip_driver_s *dev, FAR void *pvconn,
FAR void *pvpriv, uint16_t flags)
{
FAR struct uip_conn *conn = (FAR struct uip_conn*)pvconn;
FAR struct send_s *pstate = (FAR struct send_s *)pvpriv;
nllvdbg("flags: %04x\n", flags);
/* If this packet contains an acknowledgement, then update the count of
* acknowledged bytes.
*/
if ((flags & UIP_ACKDATA) != 0)
{
FAR sq_entry_t *entry, *next;
FAR struct uip_write_s *segment;
uint32_t ackno;
ackno = uip_tcpgetsequence(TCPBUF->ackno);
for (entry = sq_peek(&conn->unacked_q); entry; entry = next)
{
next = sq_next(entry);
segment = (FAR struct uip_write_s*)entry;
if (segment->wb_seqno < ackno)
{
nllvdbg("ACK: acked=%d buflen=%d ackno=%d\n",
segment->wb_seqno, segment->wb_nbytes, ackno);
/* Segment was ACKed. Remove from ACK waiting queue */
sq_rem(entry, &conn->unacked_q);
/* Return the write buffer to the pool of free buffers */
uip_tcpwritebuffrelease(segment);
}
}
}
/* Check for a loss of connection */
else if ((flags & (UIP_CLOSE | UIP_ABORT | UIP_TIMEDOUT)) != 0)
{
/* Report not connected */
nllvdbg("Lost connection\n");
net_lostconnection(psock, flags);
goto end_wait;
}
/* Check if we are being asked to retransmit data */
else if ((flags & UIP_REXMIT) != 0)
{
sq_entry_t *entry;
/* Put all segments that have been sent but not ACKed to write queue
* again note, the un-ACKed segment is put at the first of the write_q,
* so it can be sent as soon as possible.
*/
while ((entry=sq_remlast(&conn->unacked_q)))
{
struct uip_write_s *segment = (struct uip_write_s*)entry;
if (segment->wb_nrtx >= UIP_MAXRTX)
{
//conn->unacked -= segment->wb_nbytes;
/* Return the write buffer */
uip_tcpwritebuffrelease(segment);
/* NOTE expired is different from un-ACKed, it is designed to
* represent the number of segments that have been sent,
* retransmitted, and un-ACKed, if expired is not zero, the
* connection will be closed.
*
* field expired can only be updated at UIP_ESTABLISHED state
*/
conn->expired ++;
continue;
}
send_insert_seqment(segment, &conn->write_q);
}
}
/* Check if the outgoing packet is available (it may have been claimed
* by a sendto interrupt serving a different thread).
*/
if (dev->d_sndlen > 0)
{
/* Another thread has beat us sending data, wait for the next poll */
return flags;
}
/* We get here if (1) not all of the data has been ACKed, (2) we have been
* asked to retransmit data, (3) the connection is still healthy, and (4)
* the outgoing packet is available for our use. In this case, we are
* now free to send more data to receiver -- UNLESS the buffer contains
* unprocesed incoming data. In that event, we will have to wait for the
* next polling cycle.
*/
if ((conn->tcpstateflags & UIP_ESTABLISHED) &&
(flags & (UIP_POLL | UIP_REXMIT)) &&
!(sq_empty(&conn->write_q)))
{
/* Check if the destination IP address is in the ARP table. If not,
* then the send won't actually make it out... it will be replaced with
* an ARP request.
*
* NOTE 1: This could be an expensive check if there are a lot of
* entries in the ARP table.
*
* NOTE 2: If we are actually harvesting IP addresses on incomming IP
* packets, then this check should not be necessary; the MAC mapping
* should already be in the ARP table.
*/
#if defined(CONFIG_NET_ETHERNET) && !defined(CONFIG_NET_ARP_IPIN)
if (uip_arp_find(conn->ripaddr) != NULL)
#endif
{
FAR struct uip_write_s *segment;
FAR void *sndbuff;
size_tsndlen;
/* Get the amount of data that we can send in the next packet */
segment = (FAR struct uip_write_s*)sq_peek(&conn->write_q);
if (segment)
{
sndbuff = segment->wb_buffer;
sndlen = segment->wb_nbytes;
DEBUGASSERT(sndlen <= uip_mss(conn));
/* Check if we have "space" in the window */
if ((pstate->snd_sent - pstate->snd_acked + sndlen) < conn->winsize)
{
/* We are committed.. remove the segment from the queue. */
(void)sq_remfirst(&conn->write_q);
/* Set the sequence number for this segment. NOTE: uIP
* updates sndseq on receipt of ACK *before* this function
* is called. In that case sndseq will point to the next
* unacknowledged byte (which might have already been
* sent). We will overwrite the value of sndseq here
* before the packet is sent.
*/
if (segment->wb_nrtx == 0 && segment->wb_seqno == (unsigned)-1)
{
segment->wb_seqno = conn->isn + conn->sent;
}
uip_tcpsetsequence(conn->sndseq, segment->wb_seqno);
/* Then set-up to send that amount of data. (this won't
* actually happen until the polling cycle completes).
*/
uip_send(dev, sndbuff, sndlen);
/* Remember how much data we send out now so that we know
* when everything has been acknowledged. Just increment
* the amount of data sent. This will be needed in
* sequence* number calculations and we know that this is
* not a re-transmission. Re-transmissions do not go through
* this path.
*/
if (segment->wb_nrtx == 0)
{
conn->unacked += sndlen;
conn->sent += sndlen;
}
/* Increment the retransmission counter before expiration.
* NOTE we will not calculate the retransmission timer
* (RTT) to save cpu cycles, each send_insert_seqment
* segment will be retransmitted UIP_MAXRTX times in halt-
* second interval before expiration.
*/
segment->wb_nrtx ++;
/* The segment is waiting for ACK again */
send_insert_seqment(segment, &conn->unacked_q);
/* Only one data can be sent by low level driver at once,
* tell the caller stop polling the other connection.
*/
flags &= ~UIP_POLL;
}
}
}
}
/* Continue waiting */
return flags;
end_wait:
/* Do not allow any further callbacks */
psock->s_sndcb->flags = 0;
psock->s_sndcb->event = NULL;
return flags;
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Function: psock_send
*
* Description:
* The send() call may be used only when the socket is in a connected state
* (so that the intended recipient is known). The only difference between
* send() and write() is the presence of flags. With zero flags parameter,
* send() is equivalent to write(). Also, send(sockfd,buf,len,flags) is
* equivalent to sendto(sockfd,buf,len,flags,NULL,0).
*
* Parameters:
* psock An instance of the internal socket structure.
* buf Data to send
* len Length of data to send
* flags Send flags
*
* Returned Value:
* On success, returns the number of characters sent. On error,
* -1 is returned, and errno is set appropriately:
*
* EAGAIN or EWOULDBLOCK
* The socket is marked non-blocking and the requested operation
* would block.
* EBADF
* An invalid descriptor was specified.
* ECONNRESET
* Connection reset by peer.
* EDESTADDRREQ
* The socket is not connection-mode, and no peer address is set.
* EFAULT
* An invalid user space address was specified for a parameter.
* EINTR
* A signal occurred before any data was transmitted.
* EINVAL
* Invalid argument passed.
* EISCONN
* The connection-mode socket was connected already but a recipient
* was specified. (Now either this error is returned, or the recipient
* specification is ignored.)
* EMSGSIZE
* The socket type requires that message be sent atomically, and the
* size of the message to be sent made this impossible.
* ENOBUFS
* The output queue for a network interface was full. This generally
* indicates that the interface has stopped sending, but may be
* caused by transient congestion.
* ENOMEM
* No memory available.
* ENOTCONN
* The socket is not connected, and no target has been given.
* ENOTSOCK
* The argument s is not a socket.
* EOPNOTSUPP
* Some bit in the flags argument is inappropriate for the socket
* type.
* EPIPE
* The local end has been shut down on a connection oriented socket.
* In this case the process will also receive a SIGPIPE unless
* MSG_NOSIGNAL is set.
*
* Assumptions:
*
****************************************************************************/
ssize_t psock_send(FAR struct socket *psock, FAR const void *buf, size_t len,
int flags)
{
uip_lock_t save;
size_t completed = 0;
int err;
int ret = OK;
if (!psock || psock->s_crefs <= 0)
{
err = EBADF;
goto errout;
}
if (psock->s_type != SOCK_STREAM || !_SS_ISCONNECTED(psock->s_flags))
{
err = ENOTCONN;
goto errout;
}
/* Set the socket state to sending */
psock->s_flags = _SS_SETSTATE(psock->s_flags, _SF_SEND);
save = uip_lock();
if (len > 0)
{
struct uip_conn *conn = (struct uip_conn*)psock->s_conn;
if (!psock->s_sndcb)
{
psock->s_sndcb = uip_tcpcallbackalloc(conn);
/* Set up the callback in the connection */
psock->s_sndcb->flags = (UIP_ACKDATA | UIP_REXMIT |UIP_POLL | \
UIP_CLOSE | UIP_ABORT | UIP_TIMEDOUT);
psock->s_sndcb->priv = (void*)psock;
psock->s_sndcb->event = send_interrupt;
}
/* Allocate resources to receive a callback */
while (completed < len)
{
struct uip_write_s *segment = uip_tcpwritebuffalloc(NULL);
if (segment)
{
size_t cnt;
segment->wb_seqno = (unsigned)-1;
segment->wb_nrtx = 0;
if (len-completed > CONFIG_NET_TCP_WRITE_BUFSIZE)
{
cnt = CONFIG_NET_TCP_WRITE_BUFSIZE;
}
else
{
cnt = len - completed;
}
segment->wb_nbytes = cnt;
memcpy(segment->wb_buffer, (char*)buf+completed, cnt);
completed += cnt;
/* send_interrupt() will refer to all the write buffer by
* conn->writebuff
*/
sq_addlast(&segment->wb_node, &conn->write_q);
/* Notify the device driver of the availaibilty of TX data */
netdev_txnotify(&conn->ripaddr);
}
}
}
uip_unlock(save);
/* Set the socket state to idle */
psock->s_flags = _SS_SETSTATE(psock->s_flags, _SF_IDLE);
/* Check for a errors. Errors are signaled by negative errno values
* for the send length
*/
if (completed < 0)
{
err = completed;
goto errout;
}
/* If uip_lockedwait failed, then we were probably reawakened by a signal.
* In this case, uip_lockedwait will have set errno appropriately.
*/
if (ret < 0)
{
err = -ret;
goto errout;
}
/* Return the number of bytes actually sent */
return completed;
errout:
set_errno(err);
return ERROR;
}
#endif /* CONFIG_NET && CONFIG_NET_TCP && CONFIG_NET_TCP_WRITE_BUFFERS */

638
net/net_send_unbuffered.c Normal file
View File

@ -0,0 +1,638 @@
/****************************************************************************
* net/net_send_unbuffered.c
*
* Copyright (C) 2007-2014 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* 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/config.h>
#if defined(CONFIG_NET) && defined(CONFIG_NET_TCP) && \
!defined(CONFIG_NET_TCP_WRITE_BUFFERS)
#include <sys/types.h>
#include <sys/socket.h>
#include <stdint.h>
#include <stdbool.h>
#include <string.h>
#include <errno.h>
#include <debug.h>
#include <arch/irq.h>
#include <nuttx/clock.h>
#include <nuttx/net/uip/uip-arp.h>
#include <nuttx/net/uip/uip-arch.h>
#ifdef CONFIG_NET_ARP_IPIN
# include <nuttx/net/uip/uip-arp.h>
#endif
#include "net_internal.h"
#include "uip/uip_internal.h"
/****************************************************************************
* Definitions
****************************************************************************/
#if defined(CONFIG_NET_TCP_SPLIT) && !defined(CONFIG_NET_TCP_SPLIT_SIZE)
# define CONFIG_NET_TCP_SPLIT_SIZE 40
#endif
#define TCPBUF ((struct uip_tcpip_hdr *)&dev->d_buf[UIP_LLH_LEN])
/****************************************************************************
* Private Types
****************************************************************************/
/* This structure holds the state of the send operation until it can be
* operated upon from the interrupt level.
*/
struct send_s
{
FAR struct socket *snd_sock; /* Points to the parent socket structure */
FAR struct uip_callback_s *snd_cb; /* Reference to callback instance */
sem_t snd_sem; /* Used to wake up the waiting thread */
FAR const uint8_t *snd_buffer; /* Points to the buffer of data to send */
size_t snd_buflen; /* Number of bytes in the buffer to send */
ssize_t snd_sent; /* The number of bytes sent */
uint32_t snd_isn; /* Initial sequence number */
uint32_t snd_acked; /* The number of bytes acked */
#if defined(CONFIG_NET_SOCKOPTS) && !defined(CONFIG_DISABLE_CLOCK)
uint32_t snd_time; /* Last send time for determining timeout */
#endif
#if defined(CONFIG_NET_TCP_SPLIT)
bool snd_odd; /* True: Odd packet in pair transaction */
#endif
};
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Function: send_timeout
*
* Description:
* Check for send timeout.
*
* Parameters:
* pstate send state structure
*
* Returned Value:
* TRUE:timeout FALSE:no timeout
*
* Assumptions:
* Running at the interrupt level
*
****************************************************************************/
#if defined(CONFIG_NET_SOCKOPTS) && !defined(CONFIG_DISABLE_CLOCK)
static inline int send_timeout(FAR struct send_s *pstate)
{
FAR struct socket *psock = 0;
/* Check for a timeout configured via setsockopts(SO_SNDTIMEO).
* If none... we well let the send wait forever.
*/
psock = pstate->snd_sock;
if (psock && psock->s_sndtimeo != 0)
{
/* Check if the configured timeout has elapsed */
return net_timeo(pstate->snd_time, psock->s_sndtimeo);
}
/* No timeout */
return FALSE;
}
#endif /* CONFIG_NET_SOCKOPTS && !CONFIG_DISABLE_CLOCK */
/****************************************************************************
* Function: send_interrupt
*
* Description:
* This function is called from the interrupt level to perform the actual
* send operation when polled by the uIP layer.
*
* Parameters:
* dev The structure of the network driver that caused the interrupt
* conn The connection structure associated with the socket
* flags Set of events describing why the callback was invoked
*
* Returned Value:
* None
*
* Assumptions:
* Running at the interrupt level
*
****************************************************************************/
static uint16_t send_interrupt(FAR struct uip_driver_s *dev, FAR void *pvconn,
FAR void *pvpriv, uint16_t flags)
{
FAR struct uip_conn *conn = (FAR struct uip_conn*)pvconn;
FAR struct send_s *pstate = (FAR struct send_s *)pvpriv;
nllvdbg("flags: %04x acked: %d sent: %d\n",
flags, pstate->snd_acked, pstate->snd_sent);
/* If this packet contains an acknowledgement, then update the count of
* acknowledged bytes.
*/
if ((flags & UIP_ACKDATA) != 0)
{
/* Update the timeout */
#if defined(CONFIG_NET_SOCKOPTS) && !defined(CONFIG_DISABLE_CLOCK)
pstate->snd_time = clock_systimer();
#endif
/* The current acknowledgement number number is the (relative) offset
* of the of the next byte needed by the receiver. The snd_isn is the
* offset of the first byte to send to the receiver. The difference
* is the number of bytes to be acknowledged.
*/
pstate->snd_acked = uip_tcpgetsequence(TCPBUF->ackno) - pstate->snd_isn;
nllvdbg("ACK: acked=%d sent=%d buflen=%d\n",
pstate->snd_acked, pstate->snd_sent, pstate->snd_buflen);
/* Have all of the bytes in the buffer been sent and acknowledged? */
if (pstate->snd_acked >= pstate->snd_buflen)
{
/* Yes. Then pstate->snd_buflen should hold the number of bytes
* actually sent.
*/
goto end_wait;
}
/* No.. fall through to send more data if necessary */
}
/* Check if we are being asked to retransmit data */
else if ((flags & UIP_REXMIT) != 0)
{
/* Yes.. in this case, reset the number of bytes that have been sent
* to the number of bytes that have been ACKed.
*/
pstate->snd_sent = pstate->snd_acked;
#if defined(CONFIG_NET_TCP_SPLIT)
/* Reset the even/odd indicator to even since we need to
* retransmit.
*/
pstate->snd_odd = false;
#endif
/* Fall through to re-send data from the last that was ACKed */
}
/* Check for a loss of connection */
else if ((flags & (UIP_CLOSE|UIP_ABORT|UIP_TIMEDOUT)) != 0)
{
/* Report not connected */
nllvdbg("Lost connection\n");
net_lostconnection(pstate->snd_sock, flags);
pstate->snd_sent = -ENOTCONN;
goto end_wait;
}
/* Check if the outgoing packet is available (it may have been claimed
* by a sendto interrupt serving a different thread).
*/
#if 0 /* We can't really support multiple senders on the same TCP socket */
else if (dev->d_sndlen > 0)
{
/* Another thread has beat us sending data, wait for the next poll */
return flags;
}
#endif
/* We get here if (1) not all of the data has been ACKed, (2) we have been
* asked to retransmit data, (3) the connection is still healthy, and (4)
* the outgoing packet is available for our use. In this case, we are
* now free to send more data to receiver -- UNLESS the buffer contains
* unprocessed incoming data. In that event, we will have to wait for the
* next polling cycle.
*/
if ((flags & UIP_NEWDATA) == 0 && pstate->snd_sent < pstate->snd_buflen)
{
uint32_t seqno;
/* Get the amount of data that we can send in the next packet */
uint32_t sndlen = pstate->snd_buflen - pstate->snd_sent;
#if defined(CONFIG_NET_TCP_SPLIT)
/* RFC 1122 states that a host may delay ACKing for up to 500ms but
* must respond to every second segment). This logic here will trick
* the RFC 1122 recipient into responding sooner. This logic will be
* activated if:
*
* 1. An even number of packets has been send (where zero is an even
* number),
* 2. There is more data be sent (more than or equal to
* CONFIG_NET_TCP_SPLIT_SIZE), but
* 3. Not enough data for two packets.
*
* Then we will split the remaining, single packet into two partial
* packets. This will stimulate the RFC 1122 peer to ACK sooner.
*
* Don't try to split very small packets (less than CONFIG_NET_TCP_SPLIT_SIZE).
* Only the first even packet and the last odd packets could have
* sndlen less than CONFIG_NET_TCP_SPLIT_SIZE. The value of sndlen on
* the last even packet is guaranteed to be at least MSS/2 by the
* logic below.
*/
if (sndlen >= CONFIG_NET_TCP_SPLIT_SIZE)
{
/* sndlen is the number of bytes remaining to be sent.
* uip_mss(conn) will return the number of bytes that can sent
* in one packet. The difference, then, is the number of bytes
* that would be sent in the next packet after this one.
*/
int32_t next_sndlen = sndlen - uip_mss(conn);
/* Is this the even packet in the packet pair transaction? */
if (!pstate->snd_odd)
{
/* next_sndlen <= 0 means that the entire remaining data
* could fit into this single packet. This is condition
* in which we must do the split.
*/
if (next_sndlen <= 0)
{
/* Split so that there will be an odd packet. Here
* we know that 0 < sndlen <= MSS
*/
sndlen = (sndlen / 2) + 1;
}
}
/* No... this is the odd packet in the packet pair transaction */
else
{
/* Will there be another (even) packet afer this one?
* (next_sndlen > 0) Will the split condition occur on that
* next, even packet? ((next_sndlen - uip_mss(conn)) < 0) If
* so, then perform the split now to avoid the case where the
* byte count is less than CONFIG_NET_TCP_SPLIT_SIZE on the
* next pair.
*/
if (next_sndlen > 0 && (next_sndlen - uip_mss(conn)) < 0)
{
/* Here, we know that sndlen must be MSS < sndlen <= 2*MSS
* and so (sndlen / 2) is <= MSS.
*/
sndlen /= 2;
}
}
}
/* Toggle the even/odd indicator */
pstate->snd_odd ^= true;
#endif /* CONFIG_NET_TCP_SPLIT */
if (sndlen > uip_mss(conn))
{
sndlen = uip_mss(conn);
}
/* Check if we have "space" in the window */
if ((pstate->snd_sent - pstate->snd_acked + sndlen) < conn->winsize)
{
/* Set the sequence number for this packet. NOTE: uIP updates
* sndseq on recept of ACK *before* this function is called. In that
* case sndseq will point to the next unacknowledged byte (which might
* have already been sent). We will overwrite the value of sndseq
* here before the packet is sent.
*/
seqno = pstate->snd_sent + pstate->snd_isn;
nllvdbg("SEND: sndseq %08x->%08x\n", conn->sndseq, seqno);
uip_tcpsetsequence(conn->sndseq, seqno);
/* Then set-up to send that amount of data. (this won't actually
* happen until the polling cycle completes).
*/
uip_send(dev, &pstate->snd_buffer[pstate->snd_sent], sndlen);
/* Check if the destination IP address is in the ARP table. If not,
* then the send won't actually make it out... it will be replaced with
* an ARP request.
*
* NOTE 1: This could be an expensive check if there are a lot of entries
* in the ARP table. Hence, we only check on the first packet -- when
* snd_sent is zero.
*
* NOTE 2: If we are actually harvesting IP addresses on incoming IP
* packets, then this check should not be necessary; the MAC mapping
* should already be in the ARP table.
*/
#if defined(CONFIG_NET_ETHERNET) && !defined(CONFIG_NET_ARP_IPIN)
if (pstate->snd_sent != 0 || uip_arp_find(conn->ripaddr) != NULL)
#endif
{
/* Update the amount of data sent (but not necessarily ACKed) */
pstate->snd_sent += sndlen;
nllvdbg("SEND: acked=%d sent=%d buflen=%d\n",
pstate->snd_acked, pstate->snd_sent, pstate->snd_buflen);
}
}
}
/* All data has been sent and we are just waiting for ACK or re-transmit
* indications to complete the send. Check for a timeout.
*/
#if defined(CONFIG_NET_SOCKOPTS) && !defined(CONFIG_DISABLE_CLOCK)
if (send_timeout(pstate))
{
/* Yes.. report the timeout */
nlldbg("SEND timeout\n");
pstate->snd_sent = -ETIMEDOUT;
goto end_wait;
}
#endif /* CONFIG_NET_SOCKOPTS && !CONFIG_DISABLE_CLOCK */
/* Continue waiting */
return flags;
end_wait:
/* Do not allow any further callbacks */
pstate->snd_cb->flags = 0;
pstate->snd_cb->priv = NULL;
pstate->snd_cb->event = NULL;
/* There are no outstanding, unacknowledged bytes */
conn->unacked = 0;
/* Wake up the waiting thread */
sem_post(&pstate->snd_sem);
return flags;
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Function: psock_send
*
* Description:
* The send() call may be used only when the socket is in a connected state
* (so that the intended recipient is known). The only difference between
* send() and write() is the presence of flags. With zero flags parameter,
* send() is equivalent to write(). Also, send(sockfd,buf,len,flags) is
* equivalent to sendto(sockfd,buf,len,flags,NULL,0).
*
* Parameters:
* psock An instance of the internal socket structure.
* buf Data to send
* len Length of data to send
* flags Send flags
*
* Returned Value:
* On success, returns the number of characters sent. On error,
* -1 is returned, and errno is set appropriately:
*
* EAGAIN or EWOULDBLOCK
* The socket is marked non-blocking and the requested operation
* would block.
* EBADF
* An invalid descriptor was specified.
* ECONNRESET
* Connection reset by peer.
* EDESTADDRREQ
* The socket is not connection-mode, and no peer address is set.
* EFAULT
* An invalid user space address was specified for a parameter.
* EINTR
* A signal occurred before any data was transmitted.
* EINVAL
* Invalid argument passed.
* EISCONN
* The connection-mode socket was connected already but a recipient
* was specified. (Now either this error is returned, or the recipient
* specification is ignored.)
* EMSGSIZE
* The socket type requires that message be sent atomically, and the
* size of the message to be sent made this impossible.
* ENOBUFS
* The output queue for a network interface was full. This generally
* indicates that the interface has stopped sending, but may be
* caused by transient congestion.
* ENOMEM
* No memory available.
* ENOTCONN
* The socket is not connected, and no target has been given.
* ENOTSOCK
* The argument s is not a socket.
* EOPNOTSUPP
* Some bit in the flags argument is inappropriate for the socket
* type.
* EPIPE
* The local end has been shut down on a connection oriented socket.
* In this case the process will also receive a SIGPIPE unless
* MSG_NOSIGNAL is set.
*
* Assumptions:
*
****************************************************************************/
ssize_t psock_send(FAR struct socket *psock, FAR const void *buf, size_t len,
int flags)
{
struct send_s state;
uip_lock_t save;
int err;
int ret = OK;
/* Verify that the sockfd corresponds to valid, allocated socket */
if (!psock || psock->s_crefs <= 0)
{
err = EBADF;
goto errout;
}
/* If this is an un-connected socket, then return ENOTCONN */
if (psock->s_type != SOCK_STREAM || !_SS_ISCONNECTED(psock->s_flags))
{
err = ENOTCONN;
goto errout;
}
/* Set the socket state to sending */
psock->s_flags = _SS_SETSTATE(psock->s_flags, _SF_SEND);
/* Perform the TCP send operation */
/* Initialize the state structure. This is done with interrupts
* disabled because we don't want anything to happen until we
* are ready.
*/
save = uip_lock();
memset(&state, 0, sizeof(struct send_s));
(void)sem_init(&state. snd_sem, 0, 0); /* Doesn't really fail */
state.snd_sock = psock; /* Socket descriptor to use */
state.snd_buflen = len; /* Number of bytes to send */
state.snd_buffer = buf; /* Buffer to send from */
if (len > 0)
{
struct uip_conn *conn = (struct uip_conn*)psock->s_conn;
/* Allocate resources to receive a callback */
state.snd_cb = uip_tcpcallbackalloc(conn);
if (state.snd_cb)
{
/* Get the initial sequence number that will be used */
state.snd_isn = uip_tcpgetsequence(conn->sndseq);
/* There is no outstanding, unacknowledged data after this
* initial sequence number.
*/
conn->unacked = 0;
/* Set the initial time for calculating timeouts */
#if defined(CONFIG_NET_SOCKOPTS) && !defined(CONFIG_DISABLE_CLOCK)
state.snd_time = clock_systimer();
#endif
/* Set up the callback in the connection */
state.snd_cb->flags = UIP_ACKDATA|UIP_REXMIT|UIP_POLL|UIP_CLOSE|UIP_ABORT|UIP_TIMEDOUT;
state.snd_cb->priv = (void*)&state;
state.snd_cb->event = send_interrupt;
/* Notify the device driver of the availability of TX data */
netdev_txnotify(conn->ripaddr);
/* Wait for the send to complete or an error to occur: NOTES: (1)
* uip_lockedwait will also terminate if a signal is received, (2) interrupts
* may be disabled! They will be re-enabled while the task sleeps and
* automatically re-enabled when the task restarts.
*/
ret = uip_lockedwait(&state. snd_sem);
/* Make sure that no further interrupts are processed */
uip_tcpcallbackfree(conn, state.snd_cb);
}
}
sem_destroy(&state. snd_sem);
uip_unlock(save);
/* Set the socket state to idle */
psock->s_flags = _SS_SETSTATE(psock->s_flags, _SF_IDLE);
/* Check for a errors. Errors are signalled by negative errno values
* for the send length
*/
if (state.snd_sent < 0)
{
err = state.snd_sent;
goto errout;
}
/* If uip_lockedwait failed, then we were probably reawakened by a signal. In
* this case, uip_lockedwait will have set errno appropriately.
*/
if (ret < 0)
{
err = -ret;
goto errout;
}
/* Return the number of bytes actually sent */
return state.snd_sent;
errout:
set_errno(err);
return ERROR;
}
#endif /* CONFIG_NET && CONFIG_NET_TCP && !CONFIG_NET_TCP_WRITE_BUFFERS */

576
net/send.c
View File

@ -1,7 +1,7 @@
/****************************************************************************
* net/send.c
*
* Copyright (C) 2007-2013 Gregory Nutt. All rights reserved.
* Copyright (C) 2007-2014 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* Redistribution and use in source and binary forms, with or without
@ -43,598 +43,24 @@
#include <sys/types.h>
#include <sys/socket.h>
#include <stdint.h>
#include <stdbool.h>
#include <string.h>
#include <errno.h>
#include <debug.h>
#include <arch/irq.h>
#include <nuttx/clock.h>
#include <nuttx/net/uip/uip-arp.h>
#include <nuttx/net/uip/uip-arch.h>
#ifdef CONFIG_NET_ARP_IPIN
# include <nuttx/net/uip/uip-arp.h>
#endif
#include "net_internal.h"
#include "uip/uip_internal.h"
/****************************************************************************
* Definitions
****************************************************************************/
#if defined(CONFIG_NET_TCP_SPLIT) && !defined(CONFIG_NET_TCP_SPLIT_SIZE)
# define CONFIG_NET_TCP_SPLIT_SIZE 40
#endif
#define TCPBUF ((struct uip_tcpip_hdr *)&dev->d_buf[UIP_LLH_LEN])
/****************************************************************************
* Private Types
****************************************************************************/
/* This structure holds the state of the send operation until it can be
* operated upon from the interrupt level.
*/
struct send_s
{
FAR struct socket *snd_sock; /* Points to the parent socket structure */
FAR struct uip_callback_s *snd_cb; /* Reference to callback instance */
sem_t snd_sem; /* Used to wake up the waiting thread */
FAR const uint8_t *snd_buffer; /* Points to the buffer of data to send */
size_t snd_buflen; /* Number of bytes in the buffer to send */
ssize_t snd_sent; /* The number of bytes sent */
uint32_t snd_isn; /* Initial sequence number */
uint32_t snd_acked; /* The number of bytes acked */
#if defined(CONFIG_NET_SOCKOPTS) && !defined(CONFIG_DISABLE_CLOCK)
uint32_t snd_time; /* Last send time for determining timeout */
#endif
#if defined(CONFIG_NET_TCP_SPLIT)
bool snd_odd; /* True: Odd packet in pair transaction */
#endif
};
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Function: send_timeout
*
* Description:
* Check for send timeout.
*
* Parameters:
* pstate send state structure
*
* Returned Value:
* TRUE:timeout FALSE:no timeout
*
* Assumptions:
* Running at the interrupt level
*
****************************************************************************/
#if defined(CONFIG_NET_SOCKOPTS) && !defined(CONFIG_DISABLE_CLOCK)
static inline int send_timeout(FAR struct send_s *pstate)
{
FAR struct socket *psock = 0;
/* Check for a timeout configured via setsockopts(SO_SNDTIMEO).
* If none... we well let the send wait forever.
*/
psock = pstate->snd_sock;
if (psock && psock->s_sndtimeo != 0)
{
/* Check if the configured timeout has elapsed */
return net_timeo(pstate->snd_time, psock->s_sndtimeo);
}
/* No timeout */
return FALSE;
}
#endif /* CONFIG_NET_SOCKOPTS && !CONFIG_DISABLE_CLOCK */
/****************************************************************************
* Function: send_interrupt
*
* Description:
* This function is called from the interrupt level to perform the actual
* send operation when polled by the uIP layer.
*
* Parameters:
* dev The sructure of the network driver that caused the interrupt
* conn The connection structure associated with the socket
* flags Set of events describing why the callback was invoked
*
* Returned Value:
* None
*
* Assumptions:
* Running at the interrupt level
*
****************************************************************************/
static uint16_t send_interrupt(FAR struct uip_driver_s *dev, FAR void *pvconn,
FAR void *pvpriv, uint16_t flags)
{
FAR struct uip_conn *conn = (FAR struct uip_conn*)pvconn;
FAR struct send_s *pstate = (FAR struct send_s *)pvpriv;
nllvdbg("flags: %04x acked: %d sent: %d\n",
flags, pstate->snd_acked, pstate->snd_sent);
/* If this packet contains an acknowledgement, then update the count of
* acknowldged bytes.
*/
if ((flags & UIP_ACKDATA) != 0)
{
/* Update the timeout */
#if defined(CONFIG_NET_SOCKOPTS) && !defined(CONFIG_DISABLE_CLOCK)
pstate->snd_time = clock_systimer();
#endif
/* The current acknowledgement number number is the (relative) offset
* of the of the next byte needed by the receiver. The snd_isn is the
* offset of the first byte to send to the receiver. The difference
* is the number of bytes to be acknowledged.
*/
pstate->snd_acked = uip_tcpgetsequence(TCPBUF->ackno) - pstate->snd_isn;
nllvdbg("ACK: acked=%d sent=%d buflen=%d\n",
pstate->snd_acked, pstate->snd_sent, pstate->snd_buflen);
/* Have all of the bytes in the buffer been sent and acknowledged? */
if (pstate->snd_acked >= pstate->snd_buflen)
{
/* Yes. Then pstate->snd_buflen should hold the number of bytes
* actually sent.
*/
goto end_wait;
}
/* No.. fall through to send more data if necessary */
}
/* Check if we are being asked to retransmit data */
else if ((flags & UIP_REXMIT) != 0)
{
/* Yes.. in this case, reset the number of bytes that have been sent
* to the number of bytes that have been ACKed.
*/
pstate->snd_sent = pstate->snd_acked;
#if defined(CONFIG_NET_TCP_SPLIT)
/* Reset the even/odd indicator to even since we need to
* retransmit.
*/
pstate->snd_odd = false;
#endif
/* Fall through to re-send data from the last that was ACKed */
}
/* Check for a loss of connection */
else if ((flags & (UIP_CLOSE|UIP_ABORT|UIP_TIMEDOUT)) != 0)
{
/* Report not connected */
nllvdbg("Lost connection\n");
net_lostconnection(pstate->snd_sock, flags);
pstate->snd_sent = -ENOTCONN;
goto end_wait;
}
/* Check if the outgoing packet is available (it may have been claimed
* by a sendto interrupt serving a different thread).
*/
#if 0 /* We can't really support multiple senders on the same TCP socket */
else if (dev->d_sndlen > 0)
{
/* Another thread has beat us sending data, wait for the next poll */
return flags;
}
#endif
/* We get here if (1) not all of the data has been ACKed, (2) we have been
* asked to retransmit data, (3) the connection is still healthy, and (4)
* the outgoing packet is available for our use. In this case, we are
* now free to send more data to receiver -- UNLESS the buffer contains
* unprocessing incoming data. In that event, we will have to wait for the
* next polling cycle.
*/
if ((flags & UIP_NEWDATA) == 0 && pstate->snd_sent < pstate->snd_buflen)
{
uint32_t seqno;
/* Get the amount of data that we can send in the next packet */
uint32_t sndlen = pstate->snd_buflen - pstate->snd_sent;
#if defined(CONFIG_NET_TCP_SPLIT)
/* RFC 1122 states that a host may delay ACKing for up to 500ms but
* must respond to every second segment). This logic here will trick
* the RFC 1122 recipient into responding sooner. This logic will be
* activated if:
*
* 1. An even number of packets has been send (where zero is an even
* number),
* 2. There is more data be sent (more than or equal to
* CONFIG_NET_TCP_SPLIT_SIZE), but
* 3. Not enough data for two packets.
*
* Then we will split the remaining, single packet into two partial
* packets. This will stimulate the RFC 1122 peer to ACK sooner.
*
* Don't try to split very small packets (less than CONFIG_NET_TCP_SPLIT_SIZE).
* Only the first even packet and the last odd packets could have
* sndlen less than CONFIG_NET_TCP_SPLIT_SIZE. The value of sndlen on
* the last even packet is guaranteed to be at least MSS/2 by the
* logic below.
*/
if (sndlen >= CONFIG_NET_TCP_SPLIT_SIZE)
{
/* sndlen is the number of bytes remaining to be sent.
* uip_mss(conn) will return the number of bytes that can sent
* in one packet. The difference, then, is the number of bytes
* that would be sent in the next packet after this one.
*/
int32_t next_sndlen = sndlen - uip_mss(conn);
/* Is this the even packet in the packet pair transaction? */
if (!pstate->snd_odd)
{
/* next_sndlen <= 0 means that the entire remaining data
* could fit into this single packet. This is condition
* in which we must do the split.
*/
if (next_sndlen <= 0)
{
/* Split so that there will be an odd packet. Here
* we know that 0 < sndlen <= MSS
*/
sndlen = (sndlen / 2) + 1;
}
}
/* No... this is the odd packet in the packet pair transaction */
else
{
/* Will there be another (even) packet afer this one?
* (next_sndlen > 0) Will the split conidition occur on that
* next, even packet? ((next_sndlen - uip_mss(conn)) < 0) If
* so, then perform the split now to avoid the case where the
* byte count is less than CONFIG_NET_TCP_SPLIT_SIZE on the
* next pair.
*/
if (next_sndlen > 0 && (next_sndlen - uip_mss(conn)) < 0)
{
/* Here, we know that sndlen must be MSS < sndlen <= 2*MSS
* and so (sndlen / 2) is <= MSS.
*/
sndlen /= 2;
}
}
}
/* Toggle the even/odd indicator */
pstate->snd_odd ^= true;
#endif /* CONFIG_NET_TCP_SPLIT */
if (sndlen > uip_mss(conn))
{
sndlen = uip_mss(conn);
}
/* Check if we have "space" in the window */
if ((pstate->snd_sent - pstate->snd_acked + sndlen) < conn->winsize)
{
/* Set the sequence number for this packet. NOTE: uIP updates
* sndseq on recept of ACK *before* this function is called. In that
* case sndseq will point to the next unacknowledge byte (which might
* have already been sent). We will overwrite the value of sndseq
* here before the packet is sent.
*/
seqno = pstate->snd_sent + pstate->snd_isn;
nllvdbg("SEND: sndseq %08x->%08x\n", conn->sndseq, seqno);
uip_tcpsetsequence(conn->sndseq, seqno);
/* Then set-up to send that amount of data. (this won't actually
* happen until the polling cycle completes).
*/
uip_send(dev, &pstate->snd_buffer[pstate->snd_sent], sndlen);
/* Check if the destination IP address is in the ARP table. If not,
* then the send won't actually make it out... it will be replaced with
* an ARP request.
*
* NOTE 1: This could be an expensive check if there are a lot of entries
* in the ARP table. Hence, we only check on the first packet -- when
* snd_sent is zero.
*
* NOTE 2: If we are actually harvesting IP addresses on incomming IP
* packets, then this check should not be necessary; the MAC mapping
* should already be in the ARP table.
*/
#if defined(CONFIG_NET_ETHERNET) && !defined(CONFIG_NET_ARP_IPIN)
if (pstate->snd_sent != 0 || uip_arp_find(conn->ripaddr) != NULL)
#endif
{
/* Update the amount of data sent (but not necessarily ACKed) */
pstate->snd_sent += sndlen;
nllvdbg("SEND: acked=%d sent=%d buflen=%d\n",
pstate->snd_acked, pstate->snd_sent, pstate->snd_buflen);
}
}
}
/* All data has been sent and we are just waiting for ACK or re-transmit
* indications to complete the send. Check for a timeout.
*/
#if defined(CONFIG_NET_SOCKOPTS) && !defined(CONFIG_DISABLE_CLOCK)
if (send_timeout(pstate))
{
/* Yes.. report the timeout */
nlldbg("SEND timeout\n");
pstate->snd_sent = -ETIMEDOUT;
goto end_wait;
}
#endif /* CONFIG_NET_SOCKOPTS && !CONFIG_DISABLE_CLOCK */
/* Continue waiting */
return flags;
end_wait:
/* Do not allow any further callbacks */
pstate->snd_cb->flags = 0;
pstate->snd_cb->priv = NULL;
pstate->snd_cb->event = NULL;
/* There are no outstanding, unacknowledged bytes */
conn->unacked = 0;
/* Wake up the waiting thread */
sem_post(&pstate->snd_sem);
return flags;
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Function: psock_send
*
* Description:
* The send() call may be used only when the socket is in a connected state
* (so that the intended recipient is known). The only difference between
* send() and write() is the presence of flags. With zero flags parameter,
* send() is equivalent to write(). Also, send(sockfd,buf,len,flags) is
* equivalent to sendto(sockfd,buf,len,flags,NULL,0).
*
* Parameters:
* psock An instance of the internal socket structure.
* buf Data to send
* len Length of data to send
* flags Send flags
*
* Returned Value:
* On success, returns the number of characters sent. On error,
* -1 is returned, and errno is set appropriately:
*
* EAGAIN or EWOULDBLOCK
* The socket is marked non-blocking and the requested operation
* would block.
* EBADF
* An invalid descriptor was specified.
* ECONNRESET
* Connection reset by peer.
* EDESTADDRREQ
* The socket is not connection-mode, and no peer address is set.
* EFAULT
* An invalid user space address was specified for a parameter.
* EINTR
* A signal occurred before any data was transmitted.
* EINVAL
* Invalid argument passed.
* EISCONN
* The connection-mode socket was connected already but a recipient
* was specified. (Now either this error is returned, or the recipient
* specification is ignored.)
* EMSGSIZE
* The socket type requires that message be sent atomically, and the
* size of the message to be sent made this impossible.
* ENOBUFS
* The output queue for a network interface was full. This generally
* indicates that the interface has stopped sending, but may be
* caused by transient congestion.
* ENOMEM
* No memory available.
* ENOTCONN
* The socket is not connected, and no target has been given.
* ENOTSOCK
* The argument s is not a socket.
* EOPNOTSUPP
* Some bit in the flags argument is inappropriate for the socket
* type.
* EPIPE
* The local end has been shut down on a connection oriented socket.
* In this case the process will also receive a SIGPIPE unless
* MSG_NOSIGNAL is set.
*
* Assumptions:
*
****************************************************************************/
ssize_t psock_send(FAR struct socket *psock, FAR const void *buf, size_t len,
int flags)
{
struct send_s state;
uip_lock_t save;
int err;
int ret = OK;
/* Verify that the sockfd corresponds to valid, allocated socket */
if (!psock || psock->s_crefs <= 0)
{
err = EBADF;
goto errout;
}
/* If this is an un-connected socket, then return ENOTCONN */
if (psock->s_type != SOCK_STREAM || !_SS_ISCONNECTED(psock->s_flags))
{
err = ENOTCONN;
goto errout;
}
/* Set the socket state to sending */
psock->s_flags = _SS_SETSTATE(psock->s_flags, _SF_SEND);
/* Perform the TCP send operation */
/* Initialize the state structure. This is done with interrupts
* disabled because we don't want anything to happen until we
* are ready.
*/
save = uip_lock();
memset(&state, 0, sizeof(struct send_s));
(void)sem_init(&state. snd_sem, 0, 0); /* Doesn't really fail */
state.snd_sock = psock; /* Socket descriptor to use */
state.snd_buflen = len; /* Number of bytes to send */
state.snd_buffer = buf; /* Buffer to send from */
if (len > 0)
{
struct uip_conn *conn = (struct uip_conn*)psock->s_conn;
/* Allocate resources to receive a callback */
state.snd_cb = uip_tcpcallbackalloc(conn);
if (state.snd_cb)
{
/* Get the initial sequence number that will be used */
state.snd_isn = uip_tcpgetsequence(conn->sndseq);
/* There is no outstanding, unacknowledged data after this
* initial sequence number.
*/
conn->unacked = 0;
/* Set the initial time for calculating timeouts */
#if defined(CONFIG_NET_SOCKOPTS) && !defined(CONFIG_DISABLE_CLOCK)
state.snd_time = clock_systimer();
#endif
/* Set up the callback in the connection */
state.snd_cb->flags = UIP_ACKDATA|UIP_REXMIT|UIP_POLL|UIP_CLOSE|UIP_ABORT|UIP_TIMEDOUT;
state.snd_cb->priv = (void*)&state;
state.snd_cb->event = send_interrupt;
/* Notify the device driver of the availaibilty of TX data */
netdev_txnotify(conn->ripaddr);
/* Wait for the send to complete or an error to occur: NOTES: (1)
* uip_lockedwait will also terminate if a signal is received, (2) interrupts
* may be disabled! They will be re-enabled while the task sleeps and
* automatically re-enabled when the task restarts.
*/
ret = uip_lockedwait(&state. snd_sem);
/* Make sure that no further interrupts are processed */
uip_tcpcallbackfree(conn, state.snd_cb);
}
}
sem_destroy(&state. snd_sem);
uip_unlock(save);
/* Set the socket state to idle */
psock->s_flags = _SS_SETSTATE(psock->s_flags, _SF_IDLE);
/* Check for a errors. Errors are signaled by negative errno values
* for the send length
*/
if (state.snd_sent < 0)
{
err = state.snd_sent;
goto errout;
}
/* If uip_lockedwait failed, then we were probably reawakened by a signal. In
* this case, uip_lockedwait will have set errno appropriately.
*/
if (ret < 0)
{
err = -ret;
goto errout;
}
/* Return the number of bytes actually sent */
return state.snd_sent;
errout:
set_errno(err);
return ERROR;
}
/****************************************************************************
* Function: send
*

14
net/socket.c
View File

@ -1,7 +1,7 @@
/****************************************************************************
* net/socket.c
*
* Copyright (C) 2007-2009, 2012 Gregory Nutt. All rights reserved.
* Copyright (C) 2007-2009, 2012, 2014 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* Redistribution and use in source and binary forms, with or without
@ -128,6 +128,9 @@ int psock_socket(int domain, int type, int protocol, FAR struct socket *psock)
psock->s_type = type;
psock->s_conn = NULL;
#ifdef CONFIG_NET_TCP_WRBUFFER
psock->s_sndcb = NULL;
#endif
/* Allocate the appropriate connection structure. This reserves the
* the connection structure is is unallocated at this point. It will
@ -153,8 +156,11 @@ int psock_socket(int domain, int type, int protocol, FAR struct socket *psock)
*/
DEBUGASSERT(conn->crefs == 0);
psock->s_conn = conn;
conn->crefs = 1;
psock->s_conn = conn;
conn->crefs = 1;
#ifdef CONFIG_NET_TCP_WRBUFFER
psock->s_sndcb = NULL;
#endif
}
}
break;
@ -282,5 +288,3 @@ errout:
}
#endif /* CONFIG_NET */

36
net/uip/Make.defs
View File

@ -1,7 +1,7 @@
############################################################################
# Make.defs
# net/uip/Make.defs
#
# Copyright (C) 2007, 2009-20010 Gregory Nutt. All rights reserved.
# Copyright (C) 2007, 2009-2010, 2014 Gregory Nutt. All rights reserved.
# Author: Gregory Nutt <gnutt@nuttx.org>
#
# Redistribution and use in source and binary forms, with or without
@ -40,8 +40,8 @@ ifeq ($(CONFIG_NET),y)
# Common IP source files
UIP_CSRCS += uip_initialize.c uip_setipid.c uip_input.c uip_send.c \
uip_poll.c uip_chksum.c uip_callback.c
UIP_CSRCS += uip_initialize.c uip_setipid.c uip_input.c uip_send.c
UIP_CSRCS += uip_poll.c uip_chksum.c uip_callback.c
# Non-interrupt level support required?
@ -65,18 +65,28 @@ endif
ifeq ($(CONFIG_NET_TCP),y)
UIP_CSRCS += uip_tcpconn.c uip_tcpseqno.c uip_tcppoll.c uip_tcptimer.c uip_tcpsend.c \
uip_tcpinput.c uip_tcpappsend.c uip_listen.c uip_tcpcallback.c \
uip_tcpreadahead.c uip_tcpbacklog.c
UIP_CSRCS += uip_tcpconn.c uip_tcpseqno.c uip_tcppoll.c uip_tcptimer.c
UIP_CSRCS += uip_tcpsend.c uip_tcpinput.c uip_tcpappsend.c uip_listen.c
UIP_CSRCS += uip_tcpcallback.c uip_tcpbacklog.c
endif
# Buffering
ifeq ($(CONFIG_NET_TCP_READAHEAD),y)
UIP_CSRCS += uip_tcpreadahead.c
endif
ifeq ($(CONFIG_NET_TCP_WRBUFFER),y)
UIP_CSRCS += uip_tcpwrbuffer.c
endif
# UDP source files
ifeq ($(CONFIG_NET_UDP),y)
UIP_CSRCS += uip_udpconn.c uip_udppoll.c uip_udpsend.c uip_udpinput.c \
uip_udpcallback.c
UIP_CSRCS += uip_udpconn.c uip_udppoll.c uip_udpsend.c uip_udpinput.c
UIP_CSRCS += uip_udpcallback.c
endif
@ -95,12 +105,10 @@ endif
# IGMP source files
ifeq ($(CONFIG_NET_IGMP),y)
UIP_CSRCS += uip_igmpgroup.c uip_igmpinit.c uip_igmpinput.c uip_igmpjoin.c \
uip_igmpleave.c uip_igmpmsg.c uip_igmpsend.c uip_igmptimer.c \
uip_mcastmac.c
UIP_CSRCS += uip_igmpgroup.c uip_igmpinit.c uip_igmpinput.c uip_igmpjoin.c
UIP_CSRCS += uip_igmpleave.c uip_igmpmsg.c uip_igmpsend.c uip_igmptimer.c
UIP_CSRCS += uip_mcastmac.c
endif
endif
endif

7
net/uip/uip_initialize.c
View File

@ -139,6 +139,12 @@ void uip_initialize(void)
#endif
#endif /* CONFIG_NET_TCP */
/* Initialize the TCP/IP write buffering */
#ifdef CONFIG_NET_TCP_WRITE_BUFFERS
uip_tcpwrbuffer_init();
#endif
/* Initialize the UDP connection structures */
#ifdef CONFIG_NET_UDP
@ -152,4 +158,3 @@ void uip_initialize(void)
#endif
}
#endif /* CONFIG_NET */

165
net/uip/uip_tcpwrbuffer.c Normal file
View File

@ -0,0 +1,165 @@
/****************************************************************************
* net/uip/uip_tcpwrbuffer.c
*
* Copyright (C) 2007-2009, 2013-2014 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/uip/uipopt.h>
#if defined(CONFIG_NET) && defined(CONFIG_NET_TCP) && defined(CONFIG_NET_TCP_WRITE_BUFFERS)
#include <queue.h>
#include <semaphore.h>
#include <debug.h>
#include "uip_internal.h"
/****************************************************************************
* 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 uip_wrbuffer_s buffers[CONFIG_NET_NTCP_WRITE_BUFFERS];
};
/****************************************************************************
* Private Data
****************************************************************************/
/* This is the state of the global write buffer resource */
static struct wrbuffer_s g_wrbuffer;
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Function: uip_tcpwrbuffer_init
*
* Description:
* Initialize the list of free write buffers
*
* Assumptions:
* Called once early initialization.
*
****************************************************************************/
void uip_tcpwrbuffer_init(void)
{
int i;
sq_init(&g_wrbuffer.freebuffers);
for (i = 0; i < CONFIG_NET_NTCP_WRITE_BUFFERS; i++)
{
sq_addfirst(&g_wrbuffer.buffers[i].wb_node, &g_wrbuffer.freebuffers);
}
sem_init(&g_wrbuffer.sem, 0, CONFIG_NET_NTCP_WRITE_BUFFERS);
}
/****************************************************************************
* Function: uip_tcpwrbuffer_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
*
* Assumptions:
* Called from user logic with interrupts enabled.
*
****************************************************************************/
FAR struct uip_wrbuffer_s *uip_tcpwrbuffer_alloc(FAR const struct timespec *abstime)
{
int ret;
if (abstime)
{
ret = sem_timedwait(&g_wrbuffer.sem, abstime);
}
else
{
ret = sem_wait(&g_wrbuffer.sem);
}
if (ret != 0)
{
return NULL;
}
return (FAR struct uip_wrbuffer_s*)sq_remfirst(&g_wrbuffer.freebuffers);
}
/****************************************************************************
* Function: uip_tcpwrbuffer_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:
* Called from interrupt level with interrupts disabled.
*
****************************************************************************/
void uip_tcpwrbuffer_release(FAR struct uip_wrbuffer_s *wrbuffer)
{
sq_addlast(&wrbuffer->wb_node, &g_wrbuffer.freebuffers);
sem_post(&g_wrbuffer.sem);
}
#endif /* CONFIG_NET && CONFIG_NET_TCP && CONFIG_NET_NTCP_WRITE_BUFFERS*/