diff options
Diffstat (limited to 'firmware/zpu/apps/txrx_uhd.c')
| -rw-r--r-- | firmware/zpu/apps/txrx_uhd.c | 35 |
1 files changed, 31 insertions, 4 deletions
diff --git a/firmware/zpu/apps/txrx_uhd.c b/firmware/zpu/apps/txrx_uhd.c index 9daf441e2..a4bfce0ec 100644 --- a/firmware/zpu/apps/txrx_uhd.c +++ b/firmware/zpu/apps/txrx_uhd.c @@ -92,8 +92,35 @@ static void handle_udp_data_packet( default: return; } - eth_mac_addr_t eth_mac_host; arp_cache_lookup_mac(&src.addr, ð_mac_host); - setup_framer(eth_mac_host, *ethernet_mac_addr(), src, dst, which); + //assume the packet destination is the packet source + //the arp cache lookup should never fail for this case + const struct socket_address src_addr = dst; + struct socket_address dst_addr = src; + eth_mac_addr_t eth_mac_dst; + arp_cache_lookup_mac(&dst_addr.addr, ð_mac_dst); + + //however, if this control packet has an alternative destination... + if (payload_len >= sizeof(usrp2_stream_ctrl_t)){ + + //parse the destination ip addr and udp port from the payload + const usrp2_stream_ctrl_t *stream_ctrl = (const usrp2_stream_ctrl_t *)payload; + dst_addr.addr.addr = stream_ctrl->ip_addr; + dst_addr.port = (uint16_t)stream_ctrl->udp_port; + struct ip_addr ip_dest = dst_addr.addr; + + //are we in the subnet? if not use the gateway + const uint32_t subnet_mask = get_subnet()->addr; + const bool in_subnet = ((get_ip_addr()->addr & subnet_mask) == (ip_dest.addr & subnet_mask)); + if (!in_subnet) ip_dest = *get_gateway(); + + //lookup the host ip address with ARP (this may fail) + const bool ok = arp_cache_lookup_mac(&ip_dest, ð_mac_dst); + if (!ok) net_common_send_arp_request(&ip_dest); + const uint32_t result = (ok)? 0 : ~0; + send_udp_pkt(dst.port, src, &result, sizeof(result)); + } + + setup_framer(eth_mac_dst, *ethernet_mac_addr(), dst_addr, src_addr, which); } #define OTW_GPIO_BANK_TO_NUM(bank) \ @@ -279,6 +306,7 @@ int main(void) { u2_init(); + arp_cache_init(); #ifdef BOOTLOADER putstr("\nUSRP N210 UDP bootloader\n"); #else @@ -294,8 +322,7 @@ main(void) //load the production FPGA image or firmware if appropriate do_the_bootload_thing(); //if we get here we've fallen through to safe firmware - set_default_mac_addr(); - set_default_ip_addr(); + eth_addrs_set_default(); #endif print_mac_addr(ethernet_mac_addr()); newline(); |