static ssize_t spapr_vlan_receive(NetClientState *nc, const uint8_t *buf, size_t size) { VIOsPAPRDevice *sdev = DO_UPCAST(NICState, nc, nc)->opaque; VIOsPAPRVLANDevice *dev = (VIOsPAPRVLANDevice *)sdev; vlan_bd_t rxq_bd = vio_ldq(sdev, dev->buf_list + VLAN_RXQ_BD_OFF); vlan_bd_t bd; int buf_ptr = dev->use_buf_ptr; uint64_t handle; uint8_t control; dprintf("spapr_vlan_receive() [%s] rx_bufs=%d\n", sdev->qdev.id, dev->rx_bufs); if (!dev->isopen) { return -1; } if (!dev->rx_bufs) { return -1; } do { buf_ptr += 8; if (buf_ptr >= SPAPR_TCE_PAGE_SIZE) { buf_ptr = VLAN_RX_BDS_OFF; } bd = vio_ldq(sdev, dev->buf_list + buf_ptr); dprintf("use_buf_ptr=%d bd=0x%016llx\n", buf_ptr, (unsigned long long)bd); } while ((!(bd & VLAN_BD_VALID) || (VLAN_BD_LEN(bd) < (size + 8))) && (buf_ptr != dev->use_buf_ptr)); if (!(bd & VLAN_BD_VALID) || (VLAN_BD_LEN(bd) < (size + 8))) { /* Failed to find a suitable buffer */ return -1; } /* Remove the buffer from the pool */ dev->rx_bufs--; dev->use_buf_ptr = buf_ptr; vio_stq(sdev, dev->buf_list + dev->use_buf_ptr, 0); dprintf("Found buffer: ptr=%d num=%d\n", dev->use_buf_ptr, dev->rx_bufs); /* Transfer the packet data */ if (spapr_vio_dma_write(sdev, VLAN_BD_ADDR(bd) + 8, buf, size) < 0) { return -1; } dprintf("spapr_vlan_receive: DMA write completed\n"); /* Update the receive queue */ control = VLAN_RXQC_TOGGLE | VLAN_RXQC_VALID; if (rxq_bd & VLAN_BD_TOGGLE) { control ^= VLAN_RXQC_TOGGLE; } handle = vio_ldq(sdev, VLAN_BD_ADDR(bd)); vio_stq(sdev, VLAN_BD_ADDR(rxq_bd) + dev->rxq_ptr + 8, handle); vio_stl(sdev, VLAN_BD_ADDR(rxq_bd) + dev->rxq_ptr + 4, size); vio_sth(sdev, VLAN_BD_ADDR(rxq_bd) + dev->rxq_ptr + 2, 8); vio_stb(sdev, VLAN_BD_ADDR(rxq_bd) + dev->rxq_ptr, control); dprintf("wrote rxq entry (ptr=0x%llx): 0x%016llx 0x%016llx\n", (unsigned long long)dev->rxq_ptr, (unsigned long long)vio_ldq(sdev, VLAN_BD_ADDR(rxq_bd) + dev->rxq_ptr), (unsigned long long)vio_ldq(sdev, VLAN_BD_ADDR(rxq_bd) + dev->rxq_ptr + 8)); dev->rxq_ptr += 16; if (dev->rxq_ptr >= VLAN_BD_LEN(rxq_bd)) { dev->rxq_ptr = 0; vio_stq(sdev, dev->buf_list + VLAN_RXQ_BD_OFF, rxq_bd ^ VLAN_BD_TOGGLE); } if (sdev->signal_state & 1) { qemu_irq_pulse(sdev->qirq); } return size; }