272 lines
8.6 KiB
C
272 lines
8.6 KiB
C
/****************************************************************************
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* net/pkt/pkt_send.c
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*
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* Copyright (C) 2014, 2016-2017 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#if defined(CONFIG_NET) && defined(CONFIG_NET_PKT)
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <stdint.h>
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#include <stdbool.h>
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#include <string.h>
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#include <errno.h>
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#include <debug.h>
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#include <arch/irq.h>
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#include <nuttx/semaphore.h>
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#include <nuttx/net/netdev.h>
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#include <nuttx/net/net.h>
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#include <nuttx/net/ip.h>
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#include "netdev/netdev.h"
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#include "devif/devif.h"
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#include "socket/socket.h"
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#include "pkt/pkt.h"
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/****************************************************************************
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* Private Types
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****************************************************************************/
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/* This structure holds the state of the send operation until it can be
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* operated upon by the event handler.
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*/
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struct send_s
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{
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FAR struct socket *snd_sock; /* Points to the parent socket structure */
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FAR struct devif_callback_s *snd_cb; /* Reference to callback instance */
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sem_t snd_sem; /* Used to wake up the waiting thread */
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FAR const uint8_t *snd_buffer; /* Points to the buffer of data to send */
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size_t snd_buflen; /* Number of bytes in the buffer to send */
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ssize_t snd_sent; /* The number of bytes sent */
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};
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: psock_send_eventhandler
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****************************************************************************/
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static uint16_t psock_send_eventhandler(FAR struct net_driver_s *dev,
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FAR void *pvconn,
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FAR void *pvpriv, uint16_t flags)
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{
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FAR struct send_s *pstate = (FAR struct send_s *)pvpriv;
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ninfo("flags: %04x sent: %d\n", flags, pstate->snd_sent);
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if (pstate)
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{
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/* Check if the outgoing packet is available. It may have been claimed
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* by a send event handler serving a different thread -OR- if the
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* output buffer currently contains unprocessed incoming data. In
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* these cases we will just have to wait for the next polling cycle.
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*/
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if (dev->d_sndlen > 0 || (flags & PKT_NEWDATA) != 0)
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{
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/* Another thread has beat us sending data or the buffer is busy,
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* Check for a timeout. If not timed out, wait for the next
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* polling cycle and check again.
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*/
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/* No timeout. Just wait for the next polling cycle */
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return flags;
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}
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/* It looks like we are good to send the data */
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else
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{
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/* Copy the packet data into the device packet buffer and send it */
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devif_pkt_send(dev, pstate->snd_buffer, pstate->snd_buflen);
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pstate->snd_sent = pstate->snd_buflen;
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/* Make sure no ARP request overwrites this ARP request. This
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* flag will be cleared in arp_out().
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*/
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IFF_SET_NOARP(dev->d_flags);
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}
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/* Don't allow any further call backs. */
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pstate->snd_cb->flags = 0;
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pstate->snd_cb->priv = NULL;
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pstate->snd_cb->event = NULL;
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/* Wake up the waiting thread */
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nxsem_post(&pstate->snd_sem);
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}
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return flags;
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}
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: psock_pkt_send
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*
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* Description:
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* The psock_pkt_send() call may be used only when the packet socket is in
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* a connected state (so that the intended recipient is known).
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*
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* Input Parameters:
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* psock An instance of the internal socket structure.
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* buf Data to send
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* len Length of data to send
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*
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* Returned Value:
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* On success, returns the number of characters sent. On error,
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* a negated errno value is retruend. See send() for the complete list
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* of return values.
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*
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****************************************************************************/
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ssize_t psock_pkt_send(FAR struct socket *psock, FAR const void *buf,
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size_t len)
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{
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FAR struct net_driver_s *dev;
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struct send_s state;
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int ret = OK;
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/* Verify that the sockfd corresponds to valid, allocated socket */
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if (!psock || psock->s_crefs <= 0)
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{
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return -EBADF;
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}
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/* Get the device driver that will service this transfer */
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dev = pkt_find_device((FAR struct pkt_conn_s *)psock->s_conn);
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if (dev == NULL)
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{
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return -ENODEV;
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}
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/* Perform the send operation */
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/* Initialize the state structure. This is done with the network locked
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* because we don't want anything to happen until we are ready.
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*/
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net_lock();
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memset(&state, 0, sizeof(struct send_s));
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/* This semaphore is used for signaling and, hence, should not have
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* priority inheritance enabled.
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*/
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nxsem_init(&state.snd_sem, 0, 0); /* Doesn't really fail */
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nxsem_setprotocol(&state.snd_sem, SEM_PRIO_NONE);
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state.snd_sock = psock; /* Socket descriptor to use */
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state.snd_buflen = len; /* Number of bytes to send */
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state.snd_buffer = buf; /* Buffer to send from */
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if (len > 0)
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{
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FAR struct pkt_conn_s *conn = (FAR struct pkt_conn_s *)psock->s_conn;
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/* Allocate resource to receive a callback */
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state.snd_cb = pkt_callback_alloc(dev, conn);
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if (state.snd_cb)
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{
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/* Set up the callback in the connection */
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state.snd_cb->flags = PKT_POLL;
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state.snd_cb->priv = (FAR void *)&state;
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state.snd_cb->event = psock_send_eventhandler;
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/* Notify the device driver that new TX data is available. */
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netdev_txnotify_dev(dev);
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/* Wait for the send to complete or an error to occur.
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* net_lockedwait will also terminate if a signal is received.
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*/
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ret = net_lockedwait(&state.snd_sem);
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/* Make sure that no further events are processed */
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pkt_callback_free(dev, conn, state.snd_cb);
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}
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}
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nxsem_destroy(&state.snd_sem);
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net_unlock();
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/* Check for a errors, Errors are signalled by negative errno values
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* for the send length
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*/
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if (state.snd_sent < 0)
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{
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return state.snd_sent;
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}
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/* If net_lockedwait failed, then we were probably reawakened by a signal.
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* In this case, net_lockedwait will have returned negated errno
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* appropriately.
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*/
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if (ret < 0)
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{
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return ret;
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}
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/* Return the number of bytes actually sent */
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return state.snd_sent;
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}
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#endif /* CONFIG_NET && CONFIG_NET_PKT */
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