diff options
Diffstat (limited to 'hw/xen_nic.c')
| -rw-r--r-- | hw/xen_nic.c | 439 |
1 files changed, 0 insertions, 439 deletions
diff --git a/hw/xen_nic.c b/hw/xen_nic.c deleted file mode 100644 index b6d36793b3..0000000000 --- a/hw/xen_nic.c +++ /dev/null @@ -1,439 +0,0 @@ -/* - * xen paravirt network card backend - * - * (c) Gerd Hoffmann <kraxel@redhat.com> - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; under version 2 of the License. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License along - * with this program; if not, see <http://www.gnu.org/licenses/>. - * - * Contributions after 2012-01-13 are licensed under the terms of the - * GNU GPL, version 2 or (at your option) any later version. - */ - -#include <stdio.h> -#include <stdlib.h> -#include <stdarg.h> -#include <string.h> -#include <unistd.h> -#include <signal.h> -#include <inttypes.h> -#include <fcntl.h> -#include <errno.h> -#include <sys/socket.h> -#include <sys/ioctl.h> -#include <sys/types.h> -#include <sys/stat.h> -#include <sys/mman.h> -#include <sys/wait.h> - -#include "hw/hw.h" -#include "net/net.h" -#include "net/checksum.h" -#include "net/util.h" -#include "hw/xen_backend.h" - -#include <xen/io/netif.h> - -/* ------------------------------------------------------------- */ - -struct XenNetDev { - struct XenDevice xendev; /* must be first */ - char *mac; - int tx_work; - int tx_ring_ref; - int rx_ring_ref; - struct netif_tx_sring *txs; - struct netif_rx_sring *rxs; - netif_tx_back_ring_t tx_ring; - netif_rx_back_ring_t rx_ring; - NICConf conf; - NICState *nic; -}; - -/* ------------------------------------------------------------- */ - -static void net_tx_response(struct XenNetDev *netdev, netif_tx_request_t *txp, int8_t st) -{ - RING_IDX i = netdev->tx_ring.rsp_prod_pvt; - netif_tx_response_t *resp; - int notify; - - resp = RING_GET_RESPONSE(&netdev->tx_ring, i); - resp->id = txp->id; - resp->status = st; - -#if 0 - if (txp->flags & NETTXF_extra_info) { - RING_GET_RESPONSE(&netdev->tx_ring, ++i)->status = NETIF_RSP_NULL; - } -#endif - - netdev->tx_ring.rsp_prod_pvt = ++i; - RING_PUSH_RESPONSES_AND_CHECK_NOTIFY(&netdev->tx_ring, notify); - if (notify) { - xen_be_send_notify(&netdev->xendev); - } - - if (i == netdev->tx_ring.req_cons) { - int more_to_do; - RING_FINAL_CHECK_FOR_REQUESTS(&netdev->tx_ring, more_to_do); - if (more_to_do) { - netdev->tx_work++; - } - } -} - -static void net_tx_error(struct XenNetDev *netdev, netif_tx_request_t *txp, RING_IDX end) -{ -#if 0 - /* - * Hmm, why netback fails everything in the ring? - * Should we do that even when not supporting SG and TSO? - */ - RING_IDX cons = netdev->tx_ring.req_cons; - - do { - make_tx_response(netif, txp, NETIF_RSP_ERROR); - if (cons >= end) { - break; - } - txp = RING_GET_REQUEST(&netdev->tx_ring, cons++); - } while (1); - netdev->tx_ring.req_cons = cons; - netif_schedule_work(netif); - netif_put(netif); -#else - net_tx_response(netdev, txp, NETIF_RSP_ERROR); -#endif -} - -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 = xc_gnttab_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); - } - xc_gnttab_munmap(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); -} - -/* ------------------------------------------------------------- */ - -static void net_rx_response(struct XenNetDev *netdev, - netif_rx_request_t *req, int8_t st, - uint16_t offset, uint16_t size, - uint16_t flags) -{ - RING_IDX i = netdev->rx_ring.rsp_prod_pvt; - netif_rx_response_t *resp; - int notify; - - resp = RING_GET_RESPONSE(&netdev->rx_ring, i); - resp->offset = offset; - resp->flags = flags; - resp->id = req->id; - resp->status = (int16_t)size; - if (st < 0) { - resp->status = (int16_t)st; - } - - xen_be_printf(&netdev->xendev, 3, "rx response: idx %d, status %d, flags 0x%x\n", - i, resp->status, resp->flags); - - netdev->rx_ring.rsp_prod_pvt = ++i; - RING_PUSH_RESPONSES_AND_CHECK_NOTIFY(&netdev->rx_ring, notify); - if (notify) { - xen_be_send_notify(&netdev->xendev); - } -} - -#define NET_IP_ALIGN 2 - -static int net_rx_ok(NetClientState *nc) -{ - struct XenNetDev *netdev = qemu_get_nic_opaque(nc); - RING_IDX rc, rp; - - if (netdev->xendev.be_state != XenbusStateConnected) { - return 0; - } - - rc = netdev->rx_ring.req_cons; - rp = netdev->rx_ring.sring->req_prod; - xen_rmb(); - - if (rc == rp || RING_REQUEST_CONS_OVERFLOW(&netdev->rx_ring, rc)) { - xen_be_printf(&netdev->xendev, 2, "%s: no rx buffers (%d/%d)\n", - __FUNCTION__, rc, rp); - return 0; - } - return 1; -} - -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)) { - xen_be_printf(&netdev->xendev, 2, "no buffer, drop packet\n"); - return -1; - } - 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 = xc_gnttab_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); - xc_gnttab_munmap(netdev->xendev.gnttabdev, page, 1); - net_rx_response(netdev, &rxreq, NETIF_RSP_OKAY, NET_IP_ALIGN, size, 0); - - return size; -} - -/* ------------------------------------------------------------- */ - -static NetClientInfo net_xen_info = { - .type = NET_CLIENT_OPTIONS_KIND_NIC, - .size = sizeof(NICState), - .can_receive = net_rx_ok, - .receive = net_rx_packet, -}; - -static int net_init(struct XenDevice *xendev) -{ - struct XenNetDev *netdev = container_of(xendev, struct XenNetDev, xendev); - - /* read xenstore entries */ - if (netdev->mac == NULL) { - netdev->mac = xenstore_read_be_str(&netdev->xendev, "mac"); - } - - /* do we have all we need? */ - if (netdev->mac == NULL) { - return -1; - } - - if (net_parse_macaddr(netdev->conf.macaddr.a, netdev->mac) < 0) { - return -1; - } - - netdev->nic = qemu_new_nic(&net_xen_info, &netdev->conf, - "xen", NULL, netdev); - - snprintf(qemu_get_queue(netdev->nic)->info_str, - sizeof(qemu_get_queue(netdev->nic)->info_str), - "nic: xenbus vif macaddr=%s", netdev->mac); - - /* fill info */ - xenstore_write_be_int(&netdev->xendev, "feature-rx-copy", 1); - xenstore_write_be_int(&netdev->xendev, "feature-rx-flip", 0); - - return 0; -} - -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 = xc_gnttab_map_grant_ref(netdev->xendev.gnttabdev, - netdev->xendev.dom, - netdev->tx_ring_ref, - PROT_READ | PROT_WRITE); - netdev->rxs = xc_gnttab_map_grant_ref(netdev->xendev.gnttabdev, - netdev->xendev.dom, - netdev->rx_ring_ref, - PROT_READ | PROT_WRITE); - if (!netdev->txs || !netdev->rxs) { - 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; -} - -static void net_disconnect(struct XenDevice *xendev) -{ - struct XenNetDev *netdev = container_of(xendev, struct XenNetDev, xendev); - - xen_be_unbind_evtchn(&netdev->xendev); - - if (netdev->txs) { - xc_gnttab_munmap(netdev->xendev.gnttabdev, netdev->txs, 1); - netdev->txs = NULL; - } - if (netdev->rxs) { - xc_gnttab_munmap(netdev->xendev.gnttabdev, netdev->rxs, 1); - netdev->rxs = NULL; - } - if (netdev->nic) { - qemu_del_nic(netdev->nic); - netdev->nic = NULL; - } -} - -static void net_event(struct XenDevice *xendev) -{ - struct XenNetDev *netdev = container_of(xendev, struct XenNetDev, xendev); - net_tx_packets(netdev); - qemu_flush_queued_packets(qemu_get_queue(netdev->nic)); -} - -static int net_free(struct XenDevice *xendev) -{ - struct XenNetDev *netdev = container_of(xendev, struct XenNetDev, xendev); - - g_free(netdev->mac); - return 0; -} - -/* ------------------------------------------------------------- */ - -struct XenDevOps xen_netdev_ops = { - .size = sizeof(struct XenNetDev), - .flags = DEVOPS_FLAG_NEED_GNTDEV, - .init = net_init, - .initialise = net_connect, - .event = net_event, - .disconnect = net_disconnect, - .free = net_free, -}; |