/**************************************************************************** * net/pkt/pkt_send.c * * Copyright (C) 2014 Gregory Nutt. All rights reserved. * Author: Gregory Nutt * * 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 #if defined(CONFIG_NET) && defined(CONFIG_NET_PKT) #include #include #include #include #include #include #include #include #include #include #include #include #include "netdev/netdev.h" #include "devif/devif.h" #include "socket/socket.h" #include "pkt/pkt.h" /**************************************************************************** * Pre-processor Definitions ****************************************************************************/ /**************************************************************************** * 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 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 ****************************************************************************/ /**************************************************************************** * Function: psock_send_interrupt ****************************************************************************/ static uint16_t psock_send_interrupt(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; nllvdbg("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 interrupt 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 */ sem_post(&pstate->snd_sem); } return flags; } /**************************************************************************** * Public Functions ****************************************************************************/ /**************************************************************************** * Function: 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). * * 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, * -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. * 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_pkt_send(FAR struct socket *psock, FAR const void *buf, size_t len) { FAR struct net_driver_s *dev; struct send_s state; net_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; } /* Get the device driver that will service this transfer */ dev = pkt_find_device((FAR struct pkt_conn_s *)psock->s_conn); if (dev == NULL) { err = ENODEV; goto errout; } /* 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 interrupts * disabled because we don't want anything to happen until we * are ready. */ save = net_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) { 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 = (void*)&state; state.snd_cb->event = psock_send_interrupt; /* 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: NOTES: (1) * net_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 = net_lockedwait(&state.snd_sem); /* Make sure that no further interrupts are processed */ pkt_callback_free(dev, conn, state.snd_cb); } } sem_destroy(&state.snd_sem); net_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 net_lockedwait failed, then we were probably reawakened by a signal. In * this case, net_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_PKT */