2 * Copyright (c) 2015 National Instruments
5 * Joe Hershberger <joe.hershberger@ni.com>
7 * SPDX-License-Identifier: GPL-2.0
15 DECLARE_GLOBAL_DATA_PTR;
18 * struct eth_sandbox_priv - memory for sandbox mock driver
20 * fake_host_hwaddr: MAC address of mocked machine
21 * fake_host_ipaddr: IP address of mocked machine
22 * recv_packet_buffer: buffer of the packet returned as received
23 * recv_packet_length: length of the packet returned as received
25 struct eth_sandbox_priv {
26 uchar fake_host_hwaddr[ARP_HLEN];
27 struct in_addr fake_host_ipaddr;
28 uchar *recv_packet_buffer;
29 int recv_packet_length;
32 static bool disabled[8] = {false};
35 * sandbox_eth_disable_response()
37 * index - The alias index (also DM seq number)
38 * disable - If non-zero, ignore sent packets and don't send mock response
40 void sandbox_eth_disable_response(int index, bool disable)
42 disabled[index] = disable;
45 static int sb_eth_start(struct udevice *dev)
47 struct eth_sandbox_priv *priv = dev_get_priv(dev);
49 debug("eth_sandbox: Start\n");
51 fdtdec_get_byte_array(gd->fdt_blob, dev->of_offset, "fake-host-hwaddr",
52 priv->fake_host_hwaddr, ARP_HLEN);
53 priv->recv_packet_buffer = net_rx_packets[0];
57 static int sb_eth_send(struct udevice *dev, void *packet, int length)
59 struct eth_sandbox_priv *priv = dev_get_priv(dev);
60 struct ethernet_hdr *eth = packet;
62 debug("eth_sandbox: Send packet %d\n", length);
64 if (dev->seq >= 0 && dev->seq < ARRAY_SIZE(disabled) &&
68 if (ntohs(eth->et_protlen) == PROT_ARP) {
69 struct arp_hdr *arp = packet + ETHER_HDR_SIZE;
71 if (ntohs(arp->ar_op) == ARPOP_REQUEST) {
72 struct ethernet_hdr *eth_recv;
73 struct arp_hdr *arp_recv;
75 /* store this as the assumed IP of the fake host */
76 priv->fake_host_ipaddr = net_read_ip(&arp->ar_tpa);
77 /* Formulate a fake response */
78 eth_recv = (void *)priv->recv_packet_buffer;
79 memcpy(eth_recv->et_dest, eth->et_src, ARP_HLEN);
80 memcpy(eth_recv->et_src, priv->fake_host_hwaddr,
82 eth_recv->et_protlen = htons(PROT_ARP);
84 arp_recv = (void *)priv->recv_packet_buffer +
86 arp_recv->ar_hrd = htons(ARP_ETHER);
87 arp_recv->ar_pro = htons(PROT_IP);
88 arp_recv->ar_hln = ARP_HLEN;
89 arp_recv->ar_pln = ARP_PLEN;
90 arp_recv->ar_op = htons(ARPOP_REPLY);
91 memcpy(&arp_recv->ar_sha, priv->fake_host_hwaddr,
93 net_write_ip(&arp_recv->ar_spa, priv->fake_host_ipaddr);
94 memcpy(&arp_recv->ar_tha, &arp->ar_sha, ARP_HLEN);
95 net_copy_ip(&arp_recv->ar_tpa, &arp->ar_spa);
97 priv->recv_packet_length = ETHER_HDR_SIZE +
100 } else if (ntohs(eth->et_protlen) == PROT_IP) {
101 struct ip_udp_hdr *ip = packet + ETHER_HDR_SIZE;
103 if (ip->ip_p == IPPROTO_ICMP) {
104 struct icmp_hdr *icmp = (struct icmp_hdr *)&ip->udp_src;
106 if (icmp->type == ICMP_ECHO_REQUEST) {
107 struct ethernet_hdr *eth_recv;
108 struct ip_udp_hdr *ipr;
109 struct icmp_hdr *icmpr;
111 /* reply to the ping */
112 memcpy(priv->recv_packet_buffer, packet,
114 eth_recv = (void *)priv->recv_packet_buffer;
115 ipr = (void *)priv->recv_packet_buffer +
117 icmpr = (struct icmp_hdr *)&ipr->udp_src;
118 memcpy(eth_recv->et_dest, eth->et_src,
120 memcpy(eth_recv->et_src, priv->fake_host_hwaddr,
124 net_copy_ip((void *)&ipr->ip_dst, &ip->ip_src);
125 net_write_ip((void *)&ipr->ip_src,
126 priv->fake_host_ipaddr);
127 ipr->ip_sum = compute_ip_checksum(ipr,
130 icmpr->type = ICMP_ECHO_REPLY;
132 icmpr->checksum = compute_ip_checksum(icmpr,
135 priv->recv_packet_length = length;
143 static int sb_eth_recv(struct udevice *dev, uchar **packetp)
145 struct eth_sandbox_priv *priv = dev_get_priv(dev);
147 if (priv->recv_packet_length) {
148 int lcl_recv_packet_length = priv->recv_packet_length;
150 debug("eth_sandbox: received packet %d\n",
151 priv->recv_packet_length);
152 priv->recv_packet_length = 0;
153 *packetp = priv->recv_packet_buffer;
154 return lcl_recv_packet_length;
159 static void sb_eth_stop(struct udevice *dev)
161 debug("eth_sandbox: Stop\n");
164 static int sb_eth_write_hwaddr(struct udevice *dev)
166 struct eth_pdata *pdata = dev_get_platdata(dev);
168 debug("eth_sandbox %s: Write HW ADDR - %pM\n", dev->name,
173 static const struct eth_ops sb_eth_ops = {
174 .start = sb_eth_start,
178 .write_hwaddr = sb_eth_write_hwaddr,
181 static int sb_eth_remove(struct udevice *dev)
186 static int sb_eth_ofdata_to_platdata(struct udevice *dev)
188 struct eth_pdata *pdata = dev_get_platdata(dev);
190 pdata->iobase = dev_get_addr(dev);
194 static const struct udevice_id sb_eth_ids[] = {
195 { .compatible = "sandbox,eth" },
199 U_BOOT_DRIVER(eth_sandbox) = {
200 .name = "eth_sandbox",
202 .of_match = sb_eth_ids,
203 .ofdata_to_platdata = sb_eth_ofdata_to_platdata,
204 .remove = sb_eth_remove,
206 .priv_auto_alloc_size = sizeof(struct eth_sandbox_priv),
207 .platdata_auto_alloc_size = sizeof(struct eth_pdata),