1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright (c) 2015 National Instruments
6 * Joe Hershberger <joe.hershberger@ni.com>
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};
33 static bool skip_timeout;
36 * sandbox_eth_disable_response()
38 * index - The alias index (also DM seq number)
39 * disable - If non-zero, ignore sent packets and don't send mock response
41 void sandbox_eth_disable_response(int index, bool disable)
43 disabled[index] = disable;
47 * sandbox_eth_skip_timeout()
49 * When the first packet read is attempted, fast-forward time
51 void sandbox_eth_skip_timeout(void)
56 static int sb_eth_start(struct udevice *dev)
58 struct eth_sandbox_priv *priv = dev_get_priv(dev);
60 debug("eth_sandbox: Start\n");
62 priv->recv_packet_buffer = net_rx_packets[0];
67 static int sb_eth_send(struct udevice *dev, void *packet, int length)
69 struct eth_sandbox_priv *priv = dev_get_priv(dev);
70 struct ethernet_hdr *eth = packet;
72 debug("eth_sandbox: Send packet %d\n", length);
74 if (dev->seq >= 0 && dev->seq < ARRAY_SIZE(disabled) &&
78 if (ntohs(eth->et_protlen) == PROT_ARP) {
79 struct arp_hdr *arp = packet + ETHER_HDR_SIZE;
81 if (ntohs(arp->ar_op) == ARPOP_REQUEST) {
82 struct ethernet_hdr *eth_recv;
83 struct arp_hdr *arp_recv;
85 /* store this as the assumed IP of the fake host */
86 priv->fake_host_ipaddr = net_read_ip(&arp->ar_tpa);
87 /* Formulate a fake response */
88 eth_recv = (void *)priv->recv_packet_buffer;
89 memcpy(eth_recv->et_dest, eth->et_src, ARP_HLEN);
90 memcpy(eth_recv->et_src, priv->fake_host_hwaddr,
92 eth_recv->et_protlen = htons(PROT_ARP);
94 arp_recv = (void *)priv->recv_packet_buffer +
96 arp_recv->ar_hrd = htons(ARP_ETHER);
97 arp_recv->ar_pro = htons(PROT_IP);
98 arp_recv->ar_hln = ARP_HLEN;
99 arp_recv->ar_pln = ARP_PLEN;
100 arp_recv->ar_op = htons(ARPOP_REPLY);
101 memcpy(&arp_recv->ar_sha, priv->fake_host_hwaddr,
103 net_write_ip(&arp_recv->ar_spa, priv->fake_host_ipaddr);
104 memcpy(&arp_recv->ar_tha, &arp->ar_sha, ARP_HLEN);
105 net_copy_ip(&arp_recv->ar_tpa, &arp->ar_spa);
107 priv->recv_packet_length = ETHER_HDR_SIZE +
110 } else if (ntohs(eth->et_protlen) == PROT_IP) {
111 struct ip_udp_hdr *ip = packet + ETHER_HDR_SIZE;
113 if (ip->ip_p == IPPROTO_ICMP) {
114 struct icmp_hdr *icmp = (struct icmp_hdr *)&ip->udp_src;
116 if (icmp->type == ICMP_ECHO_REQUEST) {
117 struct ethernet_hdr *eth_recv;
118 struct ip_udp_hdr *ipr;
119 struct icmp_hdr *icmpr;
121 /* reply to the ping */
122 memcpy(priv->recv_packet_buffer, packet,
124 eth_recv = (void *)priv->recv_packet_buffer;
125 ipr = (void *)priv->recv_packet_buffer +
127 icmpr = (struct icmp_hdr *)&ipr->udp_src;
128 memcpy(eth_recv->et_dest, eth->et_src,
130 memcpy(eth_recv->et_src, priv->fake_host_hwaddr,
134 net_copy_ip((void *)&ipr->ip_dst, &ip->ip_src);
135 net_write_ip((void *)&ipr->ip_src,
136 priv->fake_host_ipaddr);
137 ipr->ip_sum = compute_ip_checksum(ipr,
140 icmpr->type = ICMP_ECHO_REPLY;
142 icmpr->checksum = compute_ip_checksum(icmpr,
145 priv->recv_packet_length = length;
153 static int sb_eth_recv(struct udevice *dev, int flags, uchar **packetp)
155 struct eth_sandbox_priv *priv = dev_get_priv(dev);
158 sandbox_timer_add_offset(11000UL);
159 skip_timeout = false;
162 if (priv->recv_packet_length) {
163 int lcl_recv_packet_length = priv->recv_packet_length;
165 debug("eth_sandbox: received packet %d\n",
166 priv->recv_packet_length);
167 priv->recv_packet_length = 0;
168 *packetp = priv->recv_packet_buffer;
169 return lcl_recv_packet_length;
174 static void sb_eth_stop(struct udevice *dev)
176 debug("eth_sandbox: Stop\n");
179 static int sb_eth_write_hwaddr(struct udevice *dev)
181 struct eth_pdata *pdata = dev_get_platdata(dev);
183 debug("eth_sandbox %s: Write HW ADDR - %pM\n", dev->name,
188 static const struct eth_ops sb_eth_ops = {
189 .start = sb_eth_start,
193 .write_hwaddr = sb_eth_write_hwaddr,
196 static int sb_eth_remove(struct udevice *dev)
201 static int sb_eth_ofdata_to_platdata(struct udevice *dev)
203 struct eth_pdata *pdata = dev_get_platdata(dev);
204 struct eth_sandbox_priv *priv = dev_get_priv(dev);
207 pdata->iobase = dev_read_addr(dev);
209 mac = dev_read_u8_array_ptr(dev, "fake-host-hwaddr", ARP_HLEN);
211 printf("'fake-host-hwaddr' is missing from the DT\n");
214 memcpy(priv->fake_host_hwaddr, mac, ARP_HLEN);
219 static const struct udevice_id sb_eth_ids[] = {
220 { .compatible = "sandbox,eth" },
224 U_BOOT_DRIVER(eth_sandbox) = {
225 .name = "eth_sandbox",
227 .of_match = sb_eth_ids,
228 .ofdata_to_platdata = sb_eth_ofdata_to_platdata,
229 .remove = sb_eth_remove,
231 .priv_auto_alloc_size = sizeof(struct eth_sandbox_priv),
232 .platdata_auto_alloc_size = sizeof(struct eth_pdata),