1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (c) 2015 National Instruments 4 * 5 * (C) Copyright 2015 6 * Joe Hershberger <joe.hershberger@ni.com> 7 */ 8 9 #include <asm/eth-raw-os.h> 10 #include <common.h> 11 #include <dm.h> 12 #include <malloc.h> 13 #include <net.h> 14 15 DECLARE_GLOBAL_DATA_PTR; 16 17 static int reply_arp; 18 static struct in_addr arp_ip; 19 20 static int sb_eth_raw_start(struct udevice *dev) 21 { 22 struct eth_sandbox_raw_priv *priv = dev_get_priv(dev); 23 struct eth_pdata *pdata = dev_get_platdata(dev); 24 int ret; 25 26 debug("eth_sandbox_raw: Start\n"); 27 28 ret = sandbox_eth_raw_os_start(priv, pdata->enetaddr); 29 if (priv->local) { 30 env_set("ipaddr", "127.0.0.1"); 31 env_set("serverip", "127.0.0.1"); 32 net_ip = string_to_ip("127.0.0.1"); 33 net_server_ip = net_ip; 34 } 35 return ret; 36 } 37 38 static int sb_eth_raw_send(struct udevice *dev, void *packet, int length) 39 { 40 struct eth_sandbox_raw_priv *priv = dev_get_priv(dev); 41 42 debug("eth_sandbox_raw: Send packet %d\n", length); 43 44 if (priv->local) { 45 struct ethernet_hdr *eth = packet; 46 47 if (ntohs(eth->et_protlen) == PROT_ARP) { 48 struct arp_hdr *arp = packet + ETHER_HDR_SIZE; 49 50 /** 51 * localhost works on a higher-level API in Linux than 52 * ARP packets, so fake it 53 */ 54 arp_ip = net_read_ip(&arp->ar_tpa); 55 reply_arp = 1; 56 return 0; 57 } 58 packet += ETHER_HDR_SIZE; 59 length -= ETHER_HDR_SIZE; 60 } 61 return sandbox_eth_raw_os_send(packet, length, priv); 62 } 63 64 static int sb_eth_raw_recv(struct udevice *dev, int flags, uchar **packetp) 65 { 66 struct eth_pdata *pdata = dev_get_platdata(dev); 67 struct eth_sandbox_raw_priv *priv = dev_get_priv(dev); 68 int retval = 0; 69 int length; 70 71 if (reply_arp) { 72 struct arp_hdr *arp = (void *)net_rx_packets[0] + 73 ETHER_HDR_SIZE; 74 75 /* 76 * Fake an ARP response. The u-boot network stack is sending an 77 * ARP request (to find the MAC address to address the actual 78 * packet to) and requires an ARP response to continue. Since 79 * this is the localhost interface, there is no Etherent level 80 * traffic at all, so there is no way to send an ARP request or 81 * to get a response. For this reason we fake the response to 82 * make the u-boot network stack happy. 83 */ 84 arp->ar_hrd = htons(ARP_ETHER); 85 arp->ar_pro = htons(PROT_IP); 86 arp->ar_hln = ARP_HLEN; 87 arp->ar_pln = ARP_PLEN; 88 arp->ar_op = htons(ARPOP_REPLY); 89 /* Any non-zero MAC address will work */ 90 memset(&arp->ar_sha, 0x01, ARP_HLEN); 91 /* Use whatever IP we were looking for (always 127.0.0.1?) */ 92 net_write_ip(&arp->ar_spa, arp_ip); 93 memcpy(&arp->ar_tha, pdata->enetaddr, ARP_HLEN); 94 net_write_ip(&arp->ar_tpa, net_ip); 95 length = ARP_HDR_SIZE; 96 } else { 97 /* If local, the Ethernet header won't be included; skip it */ 98 uchar *pktptr = priv->local ? 99 net_rx_packets[0] + ETHER_HDR_SIZE : net_rx_packets[0]; 100 101 retval = sandbox_eth_raw_os_recv(pktptr, &length, priv); 102 } 103 104 if (!retval && length) { 105 if (priv->local) { 106 struct ethernet_hdr *eth = (void *)net_rx_packets[0]; 107 108 /* Fill in enough of the missing Ethernet header */ 109 memcpy(eth->et_dest, pdata->enetaddr, ARP_HLEN); 110 memset(eth->et_src, 0x01, ARP_HLEN); 111 eth->et_protlen = htons(reply_arp ? PROT_ARP : PROT_IP); 112 reply_arp = 0; 113 length += ETHER_HDR_SIZE; 114 } 115 116 debug("eth_sandbox_raw: received packet %d\n", 117 length); 118 *packetp = net_rx_packets[0]; 119 return length; 120 } 121 return retval; 122 } 123 124 static void sb_eth_raw_stop(struct udevice *dev) 125 { 126 struct eth_sandbox_raw_priv *priv = dev_get_priv(dev); 127 128 debug("eth_sandbox_raw: Stop\n"); 129 130 sandbox_eth_raw_os_stop(priv); 131 } 132 133 static int sb_eth_raw_read_rom_hwaddr(struct udevice *dev) 134 { 135 struct eth_pdata *pdata = dev_get_platdata(dev); 136 137 net_random_ethaddr(pdata->enetaddr); 138 139 return 0; 140 } 141 142 static const struct eth_ops sb_eth_raw_ops = { 143 .start = sb_eth_raw_start, 144 .send = sb_eth_raw_send, 145 .recv = sb_eth_raw_recv, 146 .stop = sb_eth_raw_stop, 147 .read_rom_hwaddr = sb_eth_raw_read_rom_hwaddr, 148 }; 149 150 static int sb_eth_raw_ofdata_to_platdata(struct udevice *dev) 151 { 152 struct eth_pdata *pdata = dev_get_platdata(dev); 153 struct eth_sandbox_raw_priv *priv = dev_get_priv(dev); 154 const char *ifname; 155 u32 local; 156 int ret; 157 158 pdata->iobase = dev_read_addr(dev); 159 160 ifname = dev_read_string(dev, "host-raw-interface"); 161 if (ifname) { 162 strncpy(priv->host_ifname, ifname, IFNAMSIZ); 163 printf(": Using %s from DT\n", priv->host_ifname); 164 } 165 if (dev_read_u32(dev, "host-raw-interface-idx", 166 &priv->host_ifindex) < 0) { 167 priv->host_ifindex = 0; 168 } else { 169 ret = sandbox_eth_raw_os_idx_to_name(priv); 170 if (ret < 0) 171 return ret; 172 printf(": Using interface index %d from DT (%s)\n", 173 priv->host_ifindex, priv->host_ifname); 174 } 175 176 local = sandbox_eth_raw_os_is_local(priv->host_ifname); 177 if (local < 0) 178 return local; 179 priv->local = local; 180 181 return 0; 182 } 183 184 static const struct udevice_id sb_eth_raw_ids[] = { 185 { .compatible = "sandbox,eth-raw" }, 186 { } 187 }; 188 189 U_BOOT_DRIVER(eth_sandbox_raw) = { 190 .name = "eth_sandbox_raw", 191 .id = UCLASS_ETH, 192 .of_match = sb_eth_raw_ids, 193 .ofdata_to_platdata = sb_eth_raw_ofdata_to_platdata, 194 .ops = &sb_eth_raw_ops, 195 .priv_auto_alloc_size = sizeof(struct eth_sandbox_raw_priv), 196 .platdata_auto_alloc_size = sizeof(struct eth_pdata), 197 }; 198