/**************************************************************************** * wireless/iee802154/mac802154_loopback.c * * Copyright (C) 2017 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 #include #include #include #include #include #include #include #include #include #include #include #include #include #ifndef CONFIG_NET_LOOPBACK # include #endif #ifdef CONFIG_IEEE802154_LOOPBACK /**************************************************************************** * Pre-processor Definitions ****************************************************************************/ /* We need to have the work queue to handle SPI interrupts */ #if !defined(CONFIG_SCHED_WORKQUEUE) # error Worker thread support is required (CONFIG_SCHED_WORKQUEUE) #else # if defined(CONFIG_IEEE802154_LOOPBACK_HPWORK) # define LPBKWORK HPWORK # elif defined(CONFIG_IEEE802154_LOOPBACK_LPWORK) # define LPBKWORK LPWORK # else # error Neither CONFIG_IEEE802154_LOOPBACK_HPWORK nor CONFIG_IEEE802154_LOOPBACK_LPWORK defined # endif #endif /* TX poll delay = 1 seconds. CLK_TCK is the number of clock ticks per second */ #define LO_WDDELAY (1*CLK_TCK) /**************************************************************************** * Private Types ****************************************************************************/ /* The lo_driver_s encapsulates all state information for a single hardware * interface */ struct lo_driver_s { bool lo_bifup; /* true:ifup false:ifdown */ bool lo_txdone; /* One RX packet was looped back */ WDOG_ID lo_polldog; /* TX poll timer */ struct work_s lo_work; /* For deferring poll work to the work queue */ /* This holds the information visible to the NuttX network */ struct ieee802154_driver_s lo_ieee; /* Interface understood by the network */ }; /**************************************************************************** * Private Data ****************************************************************************/ static struct lo_driver_s g_loopback; static uint8_t g_iobuffer[CONFIG_NET_6LOWPAN_MTU + CONFIG_NET_GUARDSIZE]; #ifndef CONFIG_NET_LOOPBACK static const net_ipv6addr_t g_lo_ipv6addr = { HTONS(0), HTONS(0), HTONS(0), HTONS(0), HTONS(0), HTONS(0), HTONS(0), HTONS(1) }; #endif /**************************************************************************** * Private Function Prototypes ****************************************************************************/ /* Polling logic */ static int lo_txpoll(FAR struct net_driver_s *dev); static void lo_poll_work(FAR void *arg); static void lo_poll_expiry(int argc, wdparm_t arg, ...); /* NuttX callback functions */ static int lo_ifup(FAR struct net_driver_s *dev); static int lo_ifdown(FAR struct net_driver_s *dev); static void lo_txavail_work(FAR void *arg); static int lo_txavail(FAR struct net_driver_s *dev); #if defined(CONFIG_NET_IGMP) || defined(CONFIG_NET_ICMPv6) static int lo_addmac(FAR struct net_driver_s *dev, FAR const uint8_t *mac); #ifdef CONFIG_NET_IGMP static int lo_rmmac(FAR struct net_driver_s *dev, FAR const uint8_t *mac); #endif #endif /**************************************************************************** * Private Functions ****************************************************************************/ /**************************************************************************** * Function: lo_txpoll * * Description: * Check if the network has any outgoing packets ready to send. This is * a callback from devif_poll() or devif_timer(). devif_poll() will be * called only during normal TX polling. * * Parameters: * dev - Reference to the NuttX driver state structure * * Returned Value: * OK on success; a negated errno on failure * * Assumptions: * May or may not be called from an interrupt handler. In either case, * the network is locked. * ****************************************************************************/ static int lo_txpoll(FAR struct net_driver_s *dev) { FAR struct lo_driver_s *priv = (FAR struct lo_driver_s *)dev->d_private; FAR struct iob_s *head; FAR struct iob_s *tail; FAR struct iob_s *iob; int ret; /* Remove the queued IOBs from driver structure */ head = priv->lo_ieee.i_framelist; /* Find the tail of the IOB queue */ for (tail = NULL, iob = head; iob != NULL; tail = iob, iob = iob->io_flink); /* Loop while there frames to be sent, i.e., while the IOB list is not * emtpy. Sending, of course, just means relaying back through the network * for this driver. */ while (!FRAME_IOB_EMPTY(&priv->lo_ieee)) { /* Remove the IOB from the queue */ FRAME_IOB_REMOVE(&priv->lo_ieee, iob); /* Is the queue now empty? */ if (FRAME_IOB_EMPTY(&priv->lo_ieee)) { tail = NULL; } /* Return the next frame to the network */ iob->io_flink = NULL; priv->lo_ieee.i_framelist = iob; ninfo("Send frame %p to the network. Length=%u\n", iob, iob->io_len); ret = sixlowpan_input(&priv->lo_ieee); if (ret < 0) { nerr("ERROR: sixlowpan_input returned %d\n", ret); } /* What if the network responds with more frames to send? */ if (priv->lo_ieee.i_framelist != NULL) { /* Append the new list to the tail of the queue */ iob = priv->lo_ieee.i_framelist; priv->lo_ieee.i_framelist = NULL; if (tail == NULL) { head = iob; } else { tail->io_flink = iob; } /* Find the new tail of the IOB queue */ for (tail = iob, iob = iob->io_flink; iob != NULL; tail = iob, iob = iob->io_flink); } priv->lo_txdone = true; } return 0; } /**************************************************************************** * Function: lo_poll_work * * Description: * Perform periodic polling from the worker thread * * Parameters: * arg - The argument passed when work_queue() as called. * * Returned Value: * OK on success * * Assumptions: * The network is locked * ****************************************************************************/ static void lo_poll_work(FAR void *arg) { FAR struct lo_driver_s *priv = (FAR struct lo_driver_s *)arg; /* Perform the poll */ net_lock(); priv->lo_txdone = false; (void)devif_timer(&priv->lo_ieee.i_dev, lo_txpoll); /* Was something received and looped back? */ while (priv->lo_txdone) { /* Yes, poll again for more TX data */ priv->lo_txdone = false; (void)devif_poll(&priv->lo_ieee.i_dev, lo_txpoll); } /* Setup the watchdog poll timer again */ (void)wd_start(priv->lo_polldog, LO_WDDELAY, lo_poll_expiry, 1, priv); net_unlock(); } /**************************************************************************** * Function: lo_poll_expiry * * Description: * Periodic timer handler. Called from the timer interrupt handler. * * Parameters: * argc - The number of available arguments * arg - The first argument * * Returned Value: * None * * Assumptions: * The network is locked. * ****************************************************************************/ static void lo_poll_expiry(int argc, wdparm_t arg, ...) { FAR struct lo_driver_s *priv = (FAR struct lo_driver_s *)arg; /* Schedule to perform the interrupt processing on the worker thread. */ work_queue(LPBKWORK, &priv->lo_work, lo_poll_work, priv, 0); } /**************************************************************************** * Function: lo_ifup * * Description: * NuttX Callback: Bring up the Ethernet interface when an IP address is * provided * * Parameters: * dev - Reference to the NuttX driver state structure * * Returned Value: * None * * Assumptions: * ****************************************************************************/ static int lo_ifup(FAR struct net_driver_s *dev) { FAR struct lo_driver_s *priv = (FAR struct lo_driver_s *)dev->d_private; #if CONFIG_NET_6LOWPAN_RIMEADDR_SIZE == 2 ninfo("Bringing up: Rime %02x:%02x PANID=%04x\n", dev->d_ipv6addr[0], dev->d_ipv6addr[1], priv->lo_ieee.i_panid); #elif CONFIG_NET_6LOWPAN_RIMEADDR_SIZE == 8 ninfo("Bringing up: Rime %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x PANID=%04x\n", dev->d_ipv6addr[0], dev->d_ipv6addr[1], dev->d_ipv6addr[2], dev->d_ipv6addr[3], dev->d_ipv6addr[4], dev->d_ipv6addr[5], dev->d_ipv6addr[6], dev->d_ipv6addr[7], priv->lo_ieee.i_panid); #endif /* Set and activate a timer process */ (void)wd_start(priv->lo_polldog, LO_WDDELAY, lo_poll_expiry, 1, (wdparm_t)priv); priv->lo_bifup = true; return OK; } /**************************************************************************** * Function: lo_ifdown * * Description: * NuttX Callback: Stop the interface. * * Parameters: * dev - Reference to the NuttX driver state structure * * Returned Value: * None * * Assumptions: * ****************************************************************************/ static int lo_ifdown(FAR struct net_driver_s *dev) { FAR struct lo_driver_s *priv = (FAR struct lo_driver_s *)dev->d_private; /* Cancel the TX poll timer and TX timeout timers */ wd_cancel(priv->lo_polldog); /* Mark the device "down" */ priv->lo_bifup = false; return OK; } /**************************************************************************** * Function: lo_txavail_work * * Description: * Perform an out-of-cycle poll on the worker thread. * * Parameters: * arg - Reference to the NuttX driver state structure (cast to void*) * * Returned Value: * None * * Assumptions: * Called on the higher priority worker thread. * ****************************************************************************/ static void lo_txavail_work(FAR void *arg) { FAR struct lo_driver_s *priv = (FAR struct lo_driver_s *)arg; /* Ignore the notification if the interface is not yet up */ net_lock(); if (priv->lo_bifup) { do { /* If so, then poll the network for new XMIT data */ priv->lo_txdone = false; (void)devif_poll(&priv->lo_ieee.i_dev, lo_txpoll); } while (priv->lo_txdone); } net_unlock(); } /**************************************************************************** * Function: lo_txavail * * Description: * Driver callback invoked when new TX data is available. This is a * stimulus perform an out-of-cycle poll and, thereby, reduce the TX * latency. * * Parameters: * dev - Reference to the NuttX driver state structure * * Returned Value: * None * * Assumptions: * Called in normal user mode * ****************************************************************************/ static int lo_txavail(FAR struct net_driver_s *dev) { FAR struct lo_driver_s *priv = (FAR struct lo_driver_s *)dev->d_private; /* Is our single work structure available? It may not be if there are * pending interrupt actions and we will have to ignore the Tx * availability action. */ if (work_available(&priv->lo_work)) { /* Schedule to serialize the poll on the worker thread. */ work_queue(LPBKWORK, &priv->lo_work, lo_txavail_work, priv, 0); } return OK; } /**************************************************************************** * Function: lo_addmac * * Description: * NuttX Callback: Add the specified MAC address to the hardware multicast * address filtering * * Parameters: * dev - Reference to the NuttX driver state structure * mac - The MAC address to be added * * Returned Value: * None * * Assumptions: * ****************************************************************************/ #if defined(CONFIG_NET_IGMP) || defined(CONFIG_NET_ICMPv6) static int lo_addmac(FAR struct net_driver_s *dev, FAR const uint8_t *mac) { /* There is no multicast support in the loopback driver */ return OK; } #endif /**************************************************************************** * Function: lo_rmmac * * Description: * NuttX Callback: Remove the specified MAC address from the hardware multicast * address filtering * * Parameters: * dev - Reference to the NuttX driver state structure * mac - The MAC address to be removed * * Returned Value: * None * * Assumptions: * ****************************************************************************/ #ifdef CONFIG_NET_IGMP static int lo_rmmac(FAR struct net_driver_s *dev, FAR const uint8_t *mac) { /* There is no multicast support in the loopback driver */ return OK; } #endif /**************************************************************************** * Public Functions ****************************************************************************/ /**************************************************************************** * Function: localhost_initialize * * Description: * Initialize the Ethernet controller and driver * * Parameters: * intf - In the case where there are multiple EMACs, this value * identifies which EMAC is to be initialized. * * Returned Value: * OK on success; Negated errno on failure. * * Assumptions: * ****************************************************************************/ int localhost_initialize(void) { FAR struct lo_driver_s *priv; FAR struct net_driver_s *dev; /* Get the interface structure associated with this interface number. */ priv = &g_loopback; /* Initialize the driver structure */ memset(priv, 0, sizeof(struct lo_driver_s)); dev = &priv->lo_ieee.i_dev; dev->d_ifup = lo_ifup; /* I/F up (new IP address) callback */ dev->d_ifdown = lo_ifdown; /* I/F down callback */ dev->d_txavail = lo_txavail; /* New TX data callback */ #ifdef CONFIG_NET_IGMP dev->d_addmac = lo_addmac; /* Add multicast MAC address */ dev->d_rmmac = lo_rmmac; /* Remove multicast MAC address */ #endif dev->d_buf = g_iobuffer; /* Attach the IO buffer */ dev->d_private = (FAR void *)priv; /* Used to recover private state from dev */ /* Create a watchdog for timing polling for and timing of transmissions */ priv->lo_polldog = wd_create(); /* Create periodic poll timer */ /* Register the loopabck device with the OS so that socket IOCTLs can b * performed. */ (void)netdev_register(&priv->lo_ieee.i_dev, NET_LL_IEEE802154); /* Set the local loopback IP address */ net_ipv6addr_copy(dev->d_ipv6addr, g_lo_ipv6addr); net_ipv6addr_copy(dev->d_ipv6draddr, g_lo_ipv6addr); net_ipv6addr_copy(dev->d_ipv6netmask, g_ipv6_alloneaddr); /* Put the network in the UP state */ dev->d_flags = IFF_UP; return lo_ifup(&priv->lo_ieee.i_dev); } #endif /* CONFIG_IEEE802154_LOOPBACK */