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- /****************************************************************************
- * net/pkt/pkt_send.c
- *
- * Copyright (C) 2014, 2016-2017 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_PKT)
- #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/semaphore.h>
- #include <nuttx/net/netdev.h>
- #include <nuttx/net/net.h>
- #include <nuttx/net/ip.h>
- #include "netdev/netdev.h"
- #include "devif/devif.h"
- #include "socket/socket.h"
- #include "pkt/pkt.h"
- /****************************************************************************
- * Private Types
- ****************************************************************************/
- /* This structure holds the state of the send operation until it can be
- * operated upon by the event handler.
- */
- struct send_s
- {
- FAR struct socket *snd_sock; /* Points to the parent socket structure */
- FAR struct devif_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 */
- };
- /****************************************************************************
- * Private Functions
- ****************************************************************************/
- /****************************************************************************
- * Name: psock_send_eventhandler
- ****************************************************************************/
- static uint16_t psock_send_eventhandler(FAR struct net_driver_s *dev,
- FAR void *pvconn,
- FAR void *pvpriv, uint16_t flags)
- {
- FAR struct send_s *pstate = (FAR struct send_s *)pvpriv;
- ninfo("flags: %04x sent: %d\n", flags, pstate->snd_sent);
- if (pstate)
- {
- /* Check if the outgoing packet is available. It may have been claimed
- * by a send event handler serving a different thread -OR- if the
- * output buffer currently contains unprocessed incoming data. In
- * these cases we will just have to wait for the next polling cycle.
- */
- if (dev->d_sndlen > 0 || (flags & PKT_NEWDATA) != 0)
- {
- /* Another thread has beat us sending data or the buffer is busy,
- * Check for a timeout. If not timed out, wait for the next
- * polling cycle and check again.
- */
- /* No timeout. Just wait for the next polling cycle */
- return flags;
- }
- /* It looks like we are good to send the data */
- else
- {
- /* Copy the packet data into the device packet buffer and send it */
- devif_pkt_send(dev, pstate->snd_buffer, pstate->snd_buflen);
- pstate->snd_sent = pstate->snd_buflen;
- /* Make sure no ARP request overwrites this ARP request. This
- * flag will be cleared in arp_out().
- */
- IFF_SET_NOARP(dev->d_flags);
- }
- /* Don't allow any further call backs. */
- pstate->snd_cb->flags = 0;
- pstate->snd_cb->priv = NULL;
- pstate->snd_cb->event = NULL;
- /* Wake up the waiting thread */
- nxsem_post(&pstate->snd_sem);
- }
- return flags;
- }
- /****************************************************************************
- * Public Functions
- ****************************************************************************/
- /****************************************************************************
- * Name: psock_pkt_send
- *
- * Description:
- * The psock_pkt_send() call may be used only when the packet socket is in a
- * connected state (so that the intended recipient is known).
- *
- * Input Parameters:
- * psock An instance of the internal socket structure.
- * buf Data to send
- * len Length of data to send
- *
- * Returned Value:
- * On success, returns the number of characters sent. On error,
- * a negated errno value is retruend. See send() for the complete list
- * of return values.
- *
- ****************************************************************************/
- ssize_t psock_pkt_send(FAR struct socket *psock, FAR const void *buf,
- size_t len)
- {
- FAR struct net_driver_s *dev;
- struct send_s state;
- int ret = OK;
- /* Verify that the sockfd corresponds to valid, allocated socket */
- if (!psock || psock->s_crefs <= 0)
- {
- return -EBADF;
- }
- /* Get the device driver that will service this transfer */
- dev = pkt_find_device((FAR struct pkt_conn_s *)psock->s_conn);
- if (dev == NULL)
- {
- return -ENODEV;
- }
- /* Set the socket state to sending */
- psock->s_flags = _SS_SETSTATE(psock->s_flags, _SF_SEND);
- /* Perform the send operation */
- /* Initialize the state structure. This is done with the network locked
- * because we don't want anything to happen until we are ready.
- */
- net_lock();
- memset(&state, 0, sizeof(struct send_s));
- /* This semaphore is used for signaling and, hence, should not have
- * priority inheritance enabled.
- */
- (void)nxsem_init(&state.snd_sem, 0, 0); /* Doesn't really fail */
- (void)nxsem_setprotocol(&state.snd_sem, SEM_PRIO_NONE);
- 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)
- {
- FAR struct pkt_conn_s *conn = (FAR struct pkt_conn_s *)psock->s_conn;
- /* Allocate resource to receive a callback */
- state.snd_cb = pkt_callback_alloc(dev, conn);
- if (state.snd_cb)
- {
- /* Set up the callback in the connection */
- state.snd_cb->flags = PKT_POLL;
- state.snd_cb->priv = (FAR void *)&state;
- state.snd_cb->event = psock_send_eventhandler;
- /* Notify the device driver that new TX data is available. */
- netdev_txnotify_dev(dev);
- /* Wait for the send to complete or an error to occur.
- * net_lockedwait will also terminate if a signal is received.
- */
- ret = net_lockedwait(&state.snd_sem);
- /* Make sure that no further events are processed */
- pkt_callback_free(dev, conn, state.snd_cb);
- }
- }
- nxsem_destroy(&state.snd_sem);
- net_unlock();
- /* 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)
- {
- return state.snd_sent;
- }
- /* If net_lockedwait failed, then we were probably reawakened by a signal. In
- * this case, net_lockedwait will have returned negated errno appropriately.
- */
- if (ret < 0)
- {
- return ret;
- }
- /* Return the number of bytes actually sent */
- return state.snd_sent;
- }
- #endif /* CONFIG_NET && CONFIG_NET_PKT */
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