static ssize_t nic_receive(VLANClientState *nc, 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 = DO_UPCAST(NICState, nc, nc)->opaque; uint16_t rfd_status = 0xa000; static const uint8_t broadcast_macaddr[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; /* TODO: check multiple IA bit. */ if (s->configuration[20] & BIT(6)) { missing("Multiple IA bit"); return -1; } if (s->configuration[8] & 0x80) { /* CSMA is disabled. */ logout("%p received while CSMA is disabled\n", s); return -1; } else if (size < 64 && (s->configuration[7] & BIT(0))) { /* Short frame and configuration byte 7/0 (discard short receive) set: * Short frame is discarded */ logout("%p received short frame (%zu byte)\n", s, size); s->statistics.rx_short_frame_errors++; #if 0 return -1; #endif } else if ((size > MAX_ETH_FRAME_SIZE + 4) && !(s->configuration[18] & BIT(3))) { /* Long frame and configuration byte 18/3 (long receive ok) not set: * Long frames are discarded. */ logout("%p received long frame (%zu byte), ignored\n", s, size); return -1; } else if (memcmp(buf, s->conf.macaddr.a, 6) == 0) { /* !!! */ /* Frame matches individual address. */ /* TODO: check configuration byte 15/4 (ignore U/L). */ TRACE(RXTX, logout("%p received frame for me, len=%zu\n", s, size)); } else if (memcmp(buf, broadcast_macaddr, 6) == 0) { /* Broadcast frame. */ TRACE(RXTX, logout("%p received broadcast, len=%zu\n", s, size)); rfd_status |= 0x0002; } else if (buf[0] & 0x01) { /* Multicast frame. */ TRACE(RXTX, logout("%p received multicast, len=%zu,%s\n", s, size, nic_dump(buf, size))); if (s->configuration[21] & BIT(3)) { /* Multicast all bit is set, receive all multicast frames. */ } else { unsigned mcast_idx = compute_mcast_idx(buf); assert(mcast_idx < 64); if (s->mult[mcast_idx >> 3] & (1 << (mcast_idx & 7))) { /* Multicast frame is allowed in hash table. */ } else if (s->configuration[15] & BIT(0)) { /* Promiscuous: receive all. */ rfd_status |= 0x0004; } else { TRACE(RXTX, logout("%p multicast ignored\n", s)); return -1; } } /* TODO: Next not for promiscuous mode? */ rfd_status |= 0x0002; } else if (s->configuration[15] & BIT(0)) { /* Promiscuous: receive all. */ TRACE(RXTX, logout("%p received frame in promiscuous mode, len=%zu\n", s, size)); rfd_status |= 0x0004; } else { TRACE(RXTX, logout("%p received frame, ignored, len=%zu,%s\n", s, size, nic_dump(buf, size))); return size; } if (get_ru_state(s) != ru_ready) { /* No resources available. */ logout("no resources, state=%u\n", get_ru_state(s)); /* TODO: RNR interrupt only at first failed frame? */ eepro100_rnr_interrupt(s); s->statistics.rx_resource_errors++; #if 0 assert(!"no resources"); #endif return -1; } /* !!! */ 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); if (size > rfd_size) { logout("Receive buffer (%" PRId16 " bytes) too small for data " "(%zu bytes); data truncated\n", rfd_size, size); size = rfd_size; } if (size < 64) { rfd_status |= 0x0080; } TRACE(OTHER, 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. */ #if 0 eepro100_er_interrupt(s); #endif /* Receive CRC Transfer not supported. */ if (s->configuration[18] & BIT(2)) { missing("Receive CRC Transfer"); return -1; } /* TODO: check stripping enable bit. */ #if 0 assert(!(s->configuration[17] & BIT(0))); #endif 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 & COMMAND_EL) { /* EL bit is set, so this was the last frame. */ logout("receive: Running out of frames\n"); set_ru_state(s, ru_suspended); } if (rfd_command & COMMAND_S) { /* S bit is set. */ set_ru_state(s, ru_suspended); } return size; }