/**************************************************************************** * 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 #include #include "mac802154.h" #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) /* Fake value for MAC header length */ #define MAC_HDRLEN 9 /**************************************************************************** * 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_pending; /* True: TX poll pending */ uint8_t lo_panid[2]; /* Fake PAN ID for testing */ WDOG_ID lo_polldog; /* TX poll timer */ struct work_s lo_work; /* For deferring poll work to the work queue */ FAR struct iob_s *lo_head; /* Head of IOBs queued for loopback */ FAR struct iob_s *lo_tail; /* Tail of IOBs queued for loopback */ /* This holds the information visible to the NuttX network */ struct sixlowpan_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]; static uint8_t g_eaddr[IEEE802154_EADDRSIZE] = { 0x0c, 0xfa, 0xde, 0x00, 0xde, 0xad, 0xbe, 0xef }; static uint8_t g_saddr[IEEE802154_SADDRSIZE] = { 0xab, 0xcd }; static uint8_t g_panid[IEEE802154_PANIDSIZE] = { 0xca, 0xfe }; /**************************************************************************** * Private Function Prototypes ****************************************************************************/ /* Utility functions */ static void lo_addr2ip(FAR struct net_driver_s *dev); static inline void lo_netmask(FAR struct net_driver_s *dev); /* Polling logic */ static int lo_loopback(FAR struct net_driver_s *dev); static void lo_loopback_work(FAR void *arg); 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 #ifdef CONFIG_NETDEV_IOCTL static int lo_ioctl(FAR struct net_driver_s *dev, int cmd, unsigned long arg); #endif static int lo_get_mhrlen(FAR struct sixlowpan_driver_s *netdev, FAR const struct ieee802154_frame_meta_s *meta); static int lo_req_data(FAR struct sixlowpan_driver_s *netdev, FAR const struct ieee802154_frame_meta_s *meta, FAR struct iob_s *framelist); /**************************************************************************** * Private Functions ****************************************************************************/ /**************************************************************************** * Name: lo_addr2ip * * Description: * Create a MAC-based IP address from the IEEE 802.15.14 short or extended * address assigned to the node. * * 128 112 96 80 64 48 32 16 * ---- ---- ---- ---- ---- ---- ---- ---- * fe80 0000 0000 0000 0000 00ff fe00 xxxx 2-byte short address IEEE 48-bit MAC * fe80 0000 0000 0000 xxxx xxxx xxxx xxxx 8-byte extended address IEEE EUI-64 * ****************************************************************************/ #ifdef CONFIG_NET_6LOWPAN_EXTENDEDADDR static void lo_addr2ip(FAR struct net_driver_s *dev) { /* Set the MAC address as the eaddr */ IEEE802154_EADDRCOPY(dev->d_mac.ieee802154.u8, g_eaddr); /* Set the IP address based on the eaddr */ dev->d_ipv6addr[0] = HTONS(0xfe80); dev->d_ipv6addr[1] = 0; dev->d_ipv6addr[2] = 0; dev->d_ipv6addr[3] = 0; dev->d_ipv6addr[4] = (uint16_t)g_eaddr[0] << 8 | (uint16_t)g_eaddr[1]; dev->d_ipv6addr[5] = (uint16_t)g_eaddr[2] << 8 | (uint16_t)g_eaddr[3]; dev->d_ipv6addr[6] = (uint16_t)g_eaddr[4] << 8 | (uint16_t)g_eaddr[5]; dev->d_ipv6addr[7] = (uint16_t)g_eaddr[6] << 8 | (uint16_t)g_eaddr[7]; dev->d_ipv6addr[4] ^= 0x200; } #else static void lo_addr2ip(FAR struct net_driver_s *dev) { /* Set the MAC address as the saddr */ IEEE802154_SADDRCOPY(dev->d_mac.ieee802154.u8, g_saddr); /* Set the IP address based on the saddr */ dev->d_ipv6addr[0] = HTONS(0xfe80); dev->d_ipv6addr[1] = 0; dev->d_ipv6addr[2] = 0; dev->d_ipv6addr[3] = 0; dev->d_ipv6addr[4] = 0; dev->d_ipv6addr[5] = HTONS(0x00ff); dev->d_ipv6addr[6] = HTONS(0xfe00); dev->d_ipv6addr[7] = (uint16_t)g_saddr[0] << 8 | (uint16_t)g_saddr[1]; dev->d_ipv6addr[7] ^= 0x200; } #endif /**************************************************************************** * Name: lo_netmask * * Description: * Create a netmask of a MAC-based IP address which may be based on either * the IEEE 802.15.14 short or extended address of the MAC. * * 128 112 96 80 64 48 32 16 * ---- ---- ---- ---- ---- ---- ---- ---- * fe80 0000 0000 0000 0000 00ff fe00 xxxx 2-byte short address IEEE 48-bit MAC * fe80 0000 0000 0000 xxxx xxxx xxxx xxxx 8-byte extended address IEEE EUI-64 * ****************************************************************************/ static inline void lo_netmask(FAR struct net_driver_s *dev) { dev->d_ipv6netmask[0] = 0xffff; dev->d_ipv6netmask[1] = 0xffff; dev->d_ipv6netmask[2] = 0xffff; dev->d_ipv6netmask[3] = 0xffff; #ifdef CONFIG_NET_6LOWPAN_EXTENDEDADDR dev->d_ipv6netmask[4] = 0; dev->d_ipv6netmask[5] = 0; dev->d_ipv6netmask[6] = 0; dev->d_ipv6netmask[7] = 0; #else dev->d_ipv6netmask[4] = 0xffff; dev->d_ipv6netmask[5] = 0xffff; dev->d_ipv6netmask[6] = 0xffff; dev->d_ipv6netmask[7] = 0; #endif } /**************************************************************************** * Name: lo_loopback * * 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_loopback(FAR struct net_driver_s *dev) { FAR struct lo_driver_s *priv = (FAR struct lo_driver_s *)dev->d_private; struct ieee802154_data_ind_s ind; FAR struct iob_s *iob; int ret; /* Create some fake metadata */ memset(&ind, 0, sizeof(struct ieee802154_data_ind_s)); #ifdef CONFIG_NET_6LOWPAN_EXTENDEDADDR ind.src.mode = IEEE802154_ADDRMODE_EXTENDED; ind.dest.mode = IEEE802154_ADDRMODE_EXTENDED; #else ind.src.mode = IEEE802154_ADDRMODE_SHORT; ind.dest.mode = IEEE802154_ADDRMODE_SHORT; #endif /* On loopback the local address is both the source and destination. */ IEEE802154_PANIDCOPY(ind.src.panid, g_panid); IEEE802154_SADDRCOPY(ind.src.saddr, g_saddr); IEEE802154_EADDRCOPY(ind.src.eaddr, g_eaddr); IEEE802154_PANIDCOPY(ind.dest.panid, g_panid); IEEE802154_SADDRCOPY(ind.dest.saddr, g_saddr); IEEE802154_EADDRCOPY(ind.dest.eaddr, g_eaddr); /* Loop while there framelist to be sent, i.e., while the freme list is not * emtpy. Sending, of course, just means relaying back through the network * for this driver. */ while (priv->lo_head != NULL) { ninfo("Looping frame IOB %p\n", iob); /* Increment statistics */ NETDEV_RXPACKETS(&priv->lo_ieee.r_dev); /* Remove the IOB from the queue */ iob = priv->lo_head; priv->lo_head = iob->io_flink; iob->io_flink = NULL; /* Did the framelist become empty? */ if (priv->lo_head == NULL) { priv->lo_tail = NULL; } /* Return the next frame to the network */ ninfo("Send frame %p to the network: Offset=%u Length=%u\n", iob, iob->io_offset, iob->io_len); ret = sixlowpan_input(&priv->lo_ieee, iob, &ind); /* Increment statistics */ NETDEV_TXPACKETS(&priv->lo_ieee.r_dev); if (ret < 0) { nerr("ERROR: sixlowpan_input returned %d\n", ret); NETDEV_TXERRORS(&priv->lo_ieee.r_dev); NETDEV_ERRORS(&priv->lo_ieee.r_dev); } } return 0; } /**************************************************************************** * Name: lo_loopback_work * * Description: * Perform loopback of received framelist. * * Parameters: * arg - The argument passed when work_queue() as called. * * Returned Value: * OK on success * * Assumptions: * The network is locked * ****************************************************************************/ static void lo_loopback_work(FAR void *arg) { FAR struct lo_driver_s *priv = (FAR struct lo_driver_s *)arg; /* Perform the loopback */ net_lock(); (void)lo_loopback(&priv->lo_ieee.r_dev); net_unlock(); } /**************************************************************************** * Name: 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(); (void)devif_timer(&priv->lo_ieee.r_dev, lo_loopback); /* Setup the watchdog poll timer again */ (void)wd_start(priv->lo_polldog, LO_WDDELAY, lo_poll_expiry, 1, priv); net_unlock(); } /**************************************************************************** * Name: 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; if (!work_available(&priv->lo_work) || priv->lo_head != NULL) { nwarn("WARNING: lo_work NOT available\n"); priv->lo_pending = true; } else { /* Schedule to perform the interrupt processing on the worker thread. */ priv->lo_pending = false; work_queue(LPBKWORK, &priv->lo_work, lo_poll_work, priv, 0); } } /**************************************************************************** * Name: 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; ninfo("Bringing up: IPv6 %04x:%04x:%04x:%04x:%04x:%04x:%04x:%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]); #ifdef CONFIG_NET_6LOWPAN_EXTENDEDADDR ninfo(" Node: %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x PANID=%02x:%02x\n", dev->d_mac.ieee802154.u8[0], dev->d_mac.ieee802154.u8[1], dev->d_mac.ieee802154.u8[2], dev->d_mac.ieee802154.u8[3], dev->d_mac.ieee802154.u8[4], dev->d_mac.ieee802154.u8[5], dev->d_mac.ieee802154.u8[6], dev->d_mac.ieee802154.u8[7], priv->lo_panid[0], priv->lo_panid[1]); #else ninfo(" Node: %02x:%02x PANID=%02x:%02x\n", dev->d_mac.ieee802154.u8[0], dev->d_mac.ieee802154.u8[1], priv->lo_panid[0], priv->lo_panid[1]); #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; } /**************************************************************************** * Name: 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; ninfo("IP up: %u\n", priv->lo_bifup); /* Cancel the TX poll timer and TX timeout timers */ wd_cancel(priv->lo_polldog); /* Mark the device "down" */ priv->lo_bifup = false; return OK; } /**************************************************************************** * Name: 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; ninfo("TX available work. IP up: %u\n", priv->lo_bifup); /* Ignore the notification if the interface is not yet up */ net_lock(); if (priv->lo_bifup) { /* If so, then poll the network for new XMIT data */ (void)devif_poll(&priv->lo_ieee.r_dev, lo_loopback); } net_unlock(); } /**************************************************************************** * Name: 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; ninfo("Available: %u\n", work_available(&priv->lo_work)); /* Is our single work structure available? It may not be if there are * pending actions and we will have to ignore the Tx availability * action. */ if (!work_available(&priv->lo_work) || priv->lo_head != NULL) { nwarn("WARNING: lo_work NOT available\n"); priv->lo_pending = true; } else { /* Schedule to perform the interrupt processing on the worker thread. */ priv->lo_pending = false; work_queue(LPBKWORK, &priv->lo_work, lo_txavail_work, priv, 0); } return OK; } /**************************************************************************** * Name: 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) { #ifdef CONFIG_NET_6LOWPAN_EXTENDEDADDR ninfo("MAC: %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n", mac[0], mac[1], mac[2], mac[3], mac[4], mac[5], mac[6], mac[7]); #else ninfo("MAC: %02x:%02x\n", mac[0], mac[1]); #endif /* There is no multicast support in the loopback driver */ return OK; } #endif /**************************************************************************** * Name: 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) { #ifdef CONFIG_NET_6LOWPAN_EXTENDEDADDR ninfo("MAC: %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n", mac[0], mac[1], mac[2], mac[3], mac[4], mac[5], mac[6], mac[7]); #else ninfo("MAC: %02x:%02x\n", mac[0], mac[1]); #endif /* There is no multicast support in the loopback driver */ return OK; } #endif /**************************************************************************** * Name: macnet_ioctl * * Description: * Handle network IOCTL commands directed to this device. * * Parameters: * dev - Reference to the NuttX driver state structure * cmd - The IOCTL command * arg - The argument for the IOCTL command * * Returned Value: * OK on success; Negated errno on failure. * * Assumptions: * ****************************************************************************/ #ifdef CONFIG_NETDEV_IOCTL static int lo_ioctl(FAR struct net_driver_s *dev, int cmd, unsigned long arg) { FAR struct lo_driver_s *priv; DEBUGASSERT(dev != NULL && dev->d_private != NULL); priv = (FAR struct lo_driver_s *)dev->d_private; UNUSED(priv); /* Check for IOCTLs aimed at the IEEE802.15.4 MAC layer */ if (_MAC802154IOCVALID(cmd)) { FAR struct ieee802154_netmac_s *netmac = (FAR struct ieee802154_netmac_s *)arg; DEBUGASSERT(netmac != NULL); if (cmd == MAC802154IOC_MLME_SET_REQUEST) { FAR struct ieee802154_set_req_s *setreq = &netmac->u.setreq; switch (setreq->attr) { case IEEE802154_ATTR_MAC_PANID: IEEE802154_PANIDCOPY(g_panid, setreq->attrval.mac.panid); break; case IEEE802154_ATTR_MAC_EADDR: IEEE802154_EADDRCOPY(g_eaddr, setreq->attrval.mac.eaddr); #ifdef CONFIG_NET_6LOWPAN_EXTENDEDADDR lo_addr2ip(dev); #endif break; case IEEE802154_ATTR_MAC_SADDR: IEEE802154_SADDRCOPY(g_saddr, setreq->attrval.mac.saddr); #ifndef CONFIG_NET_6LOWPAN_EXTENDEDADDR lo_addr2ip(dev); #endif break; default: return -ENOTTY; } return OK; } else if (cmd == MAC802154IOC_MLME_GET_REQUEST) { FAR struct ieee802154_get_req_s *getreq = &netmac->u.getreq; switch (getreq->attr) { case IEEE802154_ATTR_MAC_PANID: IEEE802154_PANIDCOPY(getreq->attrval.mac.panid, g_panid); break; case IEEE802154_ATTR_MAC_EADDR: IEEE802154_EADDRCOPY(getreq->attrval.mac.eaddr, g_eaddr); break; case IEEE802154_ATTR_MAC_SADDR: IEEE802154_SADDRCOPY(getreq->attrval.mac.saddr, g_saddr); break; default: return -ENOTTY; } return OK; } else { /* Not a supported IEEE 802.15.4 MAC IOCTL command */ return -ENOTTY; } } else { /* Not a valid IEEE 802.15.4 MAC IOCTL command */ return -ENOTTY; } } #endif /**************************************************************************** * Name: lo_get_mhrlen * * Description: * Calculate the MAC header length given the frame meta-data. * * Input parameters: * netdev - The networkd device that will mediate the MAC interface * meta - Meta data needed to recreate the MAC header * * Returned Value: * A non-negative MAC headeer length is returned on success; a negated * errno value is returned on any failure. * ****************************************************************************/ static int lo_get_mhrlen(FAR struct sixlowpan_driver_s *netdev, FAR const struct ieee802154_frame_meta_s *meta) { return MAC_HDRLEN; } /**************************************************************************** * Name: lo_req_data * * Description: * Requests the transfer of a list of frames to the MAC. * * Input parameters: * netdev - The networkd device that will mediate the MAC interface * meta - Meta data needed to recreate the MAC header * framelist - Head of a list of frames to be transferred. * * Returned Value: * Zero (OK) returned on success; a negated errno value is returned on * any failure. * ****************************************************************************/ static int lo_req_data(FAR struct sixlowpan_driver_s *netdev, FAR const struct ieee802154_frame_meta_s *meta, FAR struct iob_s *framelist) { FAR struct lo_driver_s *priv; FAR struct iob_s *iob; DEBUGASSERT(netdev != NULL && netdev->r_dev.d_private != NULL && framelist != NULL); priv = (FAR struct lo_driver_s *)netdev->r_dev.d_private; /* Add the incoming list of framelist to queue of framelist to loopback */ for (iob = framelist; iob != NULL; iob = framelist) { /* Increment statistics */ NETDEV_RXPACKETS(&priv->lo_ieee.r_dev); /* Remove the IOB from the queue */ framelist = iob->io_flink; iob->io_flink = NULL; ninfo("Queuing frame IOB %p\n", iob); /* Just zero the MAC header for test purposes */ DEBUGASSERT(iob->io_offset == MAC_HDRLEN); memset(iob->io_data, 0, MAC_HDRLEN); /* Add the IOB to the tail of the queue of framelist to be looped back */ if (priv->lo_tail == NULL) { priv->lo_head = iob; } else { priv->lo_tail->io_flink = iob; } priv->lo_tail = iob; } /* Schedule to serialize the poll on the worker thread. */ work_queue(LPBKWORK, &priv->lo_work, lo_loopback_work, priv, 0); return OK; } /**************************************************************************** * Public Functions ****************************************************************************/ /**************************************************************************** * Name: ieee8021514_loopback * * Description: * Initialize and register the Ieee802.15.4 MAC loopback network driver. * * Parameters: * None * * Returned Value: * OK on success; Negated errno on failure. * * Assumptions: * ****************************************************************************/ int ieee8021514_loopback(void) { FAR struct lo_driver_s *priv; FAR struct sixlowpan_driver_s *radio; FAR struct net_driver_s *dev; ninfo("Initializing\n"); /* Get the interface structure associated with this interface number. */ priv = &g_loopback; /* Initialize the driver structure */ memset(priv, 0, sizeof(struct lo_driver_s)); radio = &priv->lo_ieee; dev = &radio->r_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 #ifdef CONFIG_NETDEV_IOCTL dev->d_ioctl = lo_ioctl; /* Handle network IOCTL commands */ #endif dev->d_buf = g_iobuffer; /* Attach the IO buffer */ dev->d_private = (FAR void *)priv; /* Used to recover private state from dev */ /* Set the network mask and advertise our MAC-based IP address */ lo_netmask(dev); lo_addr2ip(dev); /* Initialize the Network frame-related callbacks */ radio->r_get_mhrlen = lo_get_mhrlen; /* Get MAC header length */ radio->r_req_data = lo_req_data; /* Enqueue frame for transmission */ /* 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 be * performed. */ (void)netdev_register(&priv->lo_ieee.r_dev, NET_LL_IEEE802154); /* Put the network in the UP state */ dev->d_flags = IFF_UP; return lo_ifup(&priv->lo_ieee.r_dev); } #endif /* CONFIG_IEEE802154_LOOPBACK */