static int net_connect(struct XenDevice *xendev) { struct XenNetDev *netdev = container_of(xendev, struct XenNetDev, xendev); int rx_copy; if (xenstore_read_fe_int(&netdev->xendev, "tx-ring-ref", &netdev->tx_ring_ref) == -1) { return -1; } if (xenstore_read_fe_int(&netdev->xendev, "rx-ring-ref", &netdev->rx_ring_ref) == -1) { return 1; } if (xenstore_read_fe_int(&netdev->xendev, "event-channel", &netdev->xendev.remote_port) == -1) { return -1; } if (xenstore_read_fe_int(&netdev->xendev, "request-rx-copy", &rx_copy) == -1) { rx_copy = 0; } if (rx_copy == 0) { xen_be_printf(&netdev->xendev, 0, "frontend doesn't support rx-copy.\n"); return -1; } netdev->txs = xengnttab_map_grant_ref(netdev->xendev.gnttabdev, netdev->xendev.dom, netdev->tx_ring_ref, PROT_READ | PROT_WRITE); if (!netdev->txs) { return -1; } netdev->rxs = xengnttab_map_grant_ref(netdev->xendev.gnttabdev, netdev->xendev.dom, netdev->rx_ring_ref, PROT_READ | PROT_WRITE); if (!netdev->rxs) { xengnttab_unmap(netdev->xendev.gnttabdev, netdev->txs, 1); netdev->txs = NULL; return -1; } BACK_RING_INIT(&netdev->tx_ring, netdev->txs, XC_PAGE_SIZE); BACK_RING_INIT(&netdev->rx_ring, netdev->rxs, XC_PAGE_SIZE); xen_be_bind_evtchn(&netdev->xendev); xen_be_printf(&netdev->xendev, 1, "ok: tx-ring-ref %d, rx-ring-ref %d, " "remote port %d, local port %d\n", netdev->tx_ring_ref, netdev->rx_ring_ref, netdev->xendev.remote_port, netdev->xendev.local_port); net_tx_packets(netdev); return 0; }
void *xc_gnttab_map_grant_ref(xc_gnttab *xcg, uint32_t domid, uint32_t ref, int prot) { return xengnttab_map_grant_ref(xcg, domid, ref, prot); }
static ssize_t net_rx_packet(NetClientState *nc, const uint8_t *buf, size_t size) { struct XenNetDev *netdev = qemu_get_nic_opaque(nc); netif_rx_request_t rxreq; RING_IDX rc, rp; void *page; if (netdev->xendev.be_state != XenbusStateConnected) { return -1; } rc = netdev->rx_ring.req_cons; rp = netdev->rx_ring.sring->req_prod; xen_rmb(); /* Ensure we see queued requests up to 'rp'. */ if (rc == rp || RING_REQUEST_CONS_OVERFLOW(&netdev->rx_ring, rc)) { return 0; } if (size > XC_PAGE_SIZE - NET_IP_ALIGN) { xen_be_printf(&netdev->xendev, 0, "packet too big (%lu > %ld)", (unsigned long)size, XC_PAGE_SIZE - NET_IP_ALIGN); return -1; } memcpy(&rxreq, RING_GET_REQUEST(&netdev->rx_ring, rc), sizeof(rxreq)); netdev->rx_ring.req_cons = ++rc; page = xengnttab_map_grant_ref(netdev->xendev.gnttabdev, netdev->xendev.dom, rxreq.gref, PROT_WRITE); if (page == NULL) { xen_be_printf(&netdev->xendev, 0, "error: rx gref dereference failed (%d)\n", rxreq.gref); net_rx_response(netdev, &rxreq, NETIF_RSP_ERROR, 0, 0, 0); return -1; } memcpy(page + NET_IP_ALIGN, buf, size); xengnttab_unmap(netdev->xendev.gnttabdev, page, 1); net_rx_response(netdev, &rxreq, NETIF_RSP_OKAY, NET_IP_ALIGN, size, 0); return size; }
static int con_initialise(struct XenDevice *xendev) { struct XenConsole *con = container_of(xendev, struct XenConsole, xendev); int limit; if (xenstore_read_int(con->console, "ring-ref", &con->ring_ref) == -1) return -1; if (xenstore_read_int(con->console, "port", &con->xendev.remote_port) == -1) return -1; if (xenstore_read_int(con->console, "limit", &limit) == 0) con->buffer.max_capacity = limit; if (!xendev->dev) { xen_pfn_t mfn = con->ring_ref; con->sring = xenforeignmemory_map(xen_fmem, con->xendev.dom, PROT_READ|PROT_WRITE, 1, &mfn, NULL); } else { con->sring = xengnttab_map_grant_ref(xendev->gnttabdev, con->xendev.dom, con->ring_ref, PROT_READ|PROT_WRITE); } if (!con->sring) return -1; xen_be_bind_evtchn(&con->xendev); qemu_chr_fe_set_handlers(&con->chr, xencons_can_receive, xencons_receive, NULL, NULL, con, NULL, true); xen_pv_printf(xendev, 1, "ring mfn %d, remote port %d, local port %d, limit %zd\n", con->ring_ref, con->xendev.remote_port, con->xendev.local_port, con->buffer.max_capacity); return 0; }
static void net_tx_packets(struct XenNetDev *netdev) { netif_tx_request_t txreq; RING_IDX rc, rp; void *page; void *tmpbuf = NULL; for (;;) { rc = netdev->tx_ring.req_cons; rp = netdev->tx_ring.sring->req_prod; xen_rmb(); /* Ensure we see queued requests up to 'rp'. */ while ((rc != rp)) { if (RING_REQUEST_CONS_OVERFLOW(&netdev->tx_ring, rc)) { break; } memcpy(&txreq, RING_GET_REQUEST(&netdev->tx_ring, rc), sizeof(txreq)); netdev->tx_ring.req_cons = ++rc; #if 1 /* should not happen in theory, we don't announce the * * feature-{sg,gso,whatelse} flags in xenstore (yet?) */ if (txreq.flags & NETTXF_extra_info) { xen_be_printf(&netdev->xendev, 0, "FIXME: extra info flag\n"); net_tx_error(netdev, &txreq, rc); continue; } if (txreq.flags & NETTXF_more_data) { xen_be_printf(&netdev->xendev, 0, "FIXME: more data flag\n"); net_tx_error(netdev, &txreq, rc); continue; } #endif if (txreq.size < 14) { xen_be_printf(&netdev->xendev, 0, "bad packet size: %d\n", txreq.size); net_tx_error(netdev, &txreq, rc); continue; } if ((txreq.offset + txreq.size) > XC_PAGE_SIZE) { xen_be_printf(&netdev->xendev, 0, "error: page crossing\n"); net_tx_error(netdev, &txreq, rc); continue; } xen_be_printf(&netdev->xendev, 3, "tx packet ref %d, off %d, len %d, flags 0x%x%s%s%s%s\n", txreq.gref, txreq.offset, txreq.size, txreq.flags, (txreq.flags & NETTXF_csum_blank) ? " csum_blank" : "", (txreq.flags & NETTXF_data_validated) ? " data_validated" : "", (txreq.flags & NETTXF_more_data) ? " more_data" : "", (txreq.flags & NETTXF_extra_info) ? " extra_info" : ""); page = xengnttab_map_grant_ref(netdev->xendev.gnttabdev, netdev->xendev.dom, txreq.gref, PROT_READ); if (page == NULL) { xen_be_printf(&netdev->xendev, 0, "error: tx gref dereference failed (%d)\n", txreq.gref); net_tx_error(netdev, &txreq, rc); continue; } if (txreq.flags & NETTXF_csum_blank) { /* have read-only mapping -> can't fill checksum in-place */ if (!tmpbuf) { tmpbuf = g_malloc(XC_PAGE_SIZE); } memcpy(tmpbuf, page + txreq.offset, txreq.size); net_checksum_calculate(tmpbuf, txreq.size); qemu_send_packet(qemu_get_queue(netdev->nic), tmpbuf, txreq.size); } else { qemu_send_packet(qemu_get_queue(netdev->nic), page + txreq.offset, txreq.size); } xengnttab_unmap(netdev->xendev.gnttabdev, page, 1); net_tx_response(netdev, &txreq, NETIF_RSP_OKAY); } if (!netdev->tx_work) { break; } netdev->tx_work = 0; } g_free(tmpbuf); }