static void nic_receive(void *opaque, const uint8_t * buf, size_t size) { /* TODO: * - Magic packets should set bit 30 in power management driver register. * - Interesting packets should set bit 29 in power management driver register. */ EEPRO100State *s = opaque; uint16_t rfd_status = 0xa000; static const uint8_t broadcast_macaddr[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; /* TODO: check multiple IA bit. */ assert(!(s->configuration[20] & BIT(6))); if (s->configuration[8] & 0x80) { /* CSMA is disabled. */ logout("%p received while CSMA is disabled\n", s); return; } else if (size < 64 && (s->configuration[7] & 1)) { /* Short frame and configuration byte 7/0 (discard short receive) set: * Short frame is discarded */ logout("%p received short frame (%d byte)\n", s, size); s->statistics.rx_short_frame_errors++; //~ return; } else if ((size > MAX_ETH_FRAME_SIZE + 4) && !(s->configuration[18] & 8)) { /* Long frame and configuration byte 18/3 (long receive ok) not set: * Long frames are discarded. */ logout("%p received long frame (%d byte), ignored\n", s, size); return; } else if (memcmp(buf, s->macaddr, 6) == 0) { // !!! /* Frame matches individual address. */ /* TODO: check configuration byte 15/4 (ignore U/L). */ logout("%p received frame for me, len=%d\n", s, size); } else if (memcmp(buf, broadcast_macaddr, 6) == 0) { /* Broadcast frame. */ logout("%p received broadcast, len=%d\n", s, size); rfd_status |= 0x0002; } else if (buf[0] & 0x01) { // !!! /* Multicast frame. */ logout("%p received multicast, len=%d\n", s, size); /* TODO: check multicast all bit. */ assert(!(s->configuration[21] & BIT(3))); int mcast_idx = compute_mcast_idx(buf); if (!(s->mult[mcast_idx >> 3] & (1 << (mcast_idx & 7)))) { return; } rfd_status |= 0x0002; } else if (s->configuration[15] & 1) { /* Promiscuous: receive all. */ logout("%p received frame in promiscuous mode, len=%d\n", s, size); rfd_status |= 0x0004; } else { logout("%p received frame, ignored, len=%d,%s\n", s, size, nic_dump(buf, size)); return; } if (get_ru_state(s) != ru_ready) { /* No ressources available. */ logout("no ressources, state=%u\n", get_ru_state(s)); s->statistics.rx_resource_errors++; //~ assert(!"no ressources"); return; } //~ !!! //~ $3 = {status = 0x0, command = 0xc000, link = 0x2d220, rx_buf_addr = 0x207dc, count = 0x0, size = 0x5f8, packet = {0x0 <repeats 1518 times>}} eepro100_rx_t rx; cpu_physical_memory_read(s->ru_base + s->ru_offset, (uint8_t *) & rx, offsetof(eepro100_rx_t, packet)); uint16_t rfd_command = le16_to_cpu(rx.command); uint16_t rfd_size = le16_to_cpu(rx.size); assert(size <= rfd_size); if (size < 64) { rfd_status |= 0x0080; } logout("command 0x%04x, link 0x%08x, addr 0x%08x, size %u\n", rfd_command, rx.link, rx.rx_buf_addr, rfd_size); stw_phys(s->ru_base + s->ru_offset + offsetof(eepro100_rx_t, status), rfd_status); stw_phys(s->ru_base + s->ru_offset + offsetof(eepro100_rx_t, count), size); /* Early receive interrupt not supported. */ //~ eepro100_er_interrupt(s); /* Receive CRC Transfer not supported. */ assert(!(s->configuration[18] & 4)); /* TODO: check stripping enable bit. */ //~ assert(!(s->configuration[17] & 1)); cpu_physical_memory_write(s->ru_base + s->ru_offset + offsetof(eepro100_rx_t, packet), buf, size); s->statistics.rx_good_frames++; eepro100_fr_interrupt(s); s->ru_offset = le32_to_cpu(rx.link); if (rfd_command & 0x8000) { /* EL bit is set, so this was the last frame. */ assert(0); } if (rfd_command & 0x4000) { /* S bit is set. */ set_ru_state(s, ru_suspended); } }