a9ae1418b3
XC_PAGE_SIZE comes from the actual Xen libraries, while XEN_PAGE_SIZE is provided by QEMU itself in xen_backend_ops.h. For backends which may be built for emulation mode, use the latter. Signed-off-by: David Woodhouse <dwmw@amazon.co.uk> Reviewed-by: Paul Durrant <paul@xen.org>
414 lines
13 KiB
C
414 lines
13 KiB
C
/*
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* xen paravirt network card backend
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*
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* (c) Gerd Hoffmann <kraxel@redhat.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; under version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, see <http://www.gnu.org/licenses/>.
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*
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* Contributions after 2012-01-13 are licensed under the terms of the
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* GNU GPL, version 2 or (at your option) any later version.
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*/
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#include "qemu/osdep.h"
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#include <sys/socket.h>
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#include <sys/ioctl.h>
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#include <sys/wait.h>
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#include "net/net.h"
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#include "net/checksum.h"
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#include "net/util.h"
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#include "hw/xen/xen-legacy-backend.h"
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#include "hw/xen/interface/io/netif.h"
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/* ------------------------------------------------------------- */
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struct XenNetDev {
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struct XenLegacyDevice xendev; /* must be first */
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char *mac;
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int tx_work;
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int tx_ring_ref;
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int rx_ring_ref;
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struct netif_tx_sring *txs;
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struct netif_rx_sring *rxs;
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netif_tx_back_ring_t tx_ring;
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netif_rx_back_ring_t rx_ring;
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NICConf conf;
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NICState *nic;
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};
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/* ------------------------------------------------------------- */
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static void net_tx_response(struct XenNetDev *netdev, netif_tx_request_t *txp, int8_t st)
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{
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RING_IDX i = netdev->tx_ring.rsp_prod_pvt;
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netif_tx_response_t *resp;
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int notify;
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resp = RING_GET_RESPONSE(&netdev->tx_ring, i);
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resp->id = txp->id;
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resp->status = st;
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#if 0
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if (txp->flags & NETTXF_extra_info) {
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RING_GET_RESPONSE(&netdev->tx_ring, ++i)->status = NETIF_RSP_NULL;
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}
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#endif
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netdev->tx_ring.rsp_prod_pvt = ++i;
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RING_PUSH_RESPONSES_AND_CHECK_NOTIFY(&netdev->tx_ring, notify);
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if (notify) {
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xen_pv_send_notify(&netdev->xendev);
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}
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if (i == netdev->tx_ring.req_cons) {
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int more_to_do;
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RING_FINAL_CHECK_FOR_REQUESTS(&netdev->tx_ring, more_to_do);
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if (more_to_do) {
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netdev->tx_work++;
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}
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}
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}
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static void net_tx_error(struct XenNetDev *netdev, netif_tx_request_t *txp, RING_IDX end)
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{
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#if 0
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/*
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* Hmm, why netback fails everything in the ring?
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* Should we do that even when not supporting SG and TSO?
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*/
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RING_IDX cons = netdev->tx_ring.req_cons;
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do {
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make_tx_response(netif, txp, NETIF_RSP_ERROR);
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if (cons >= end) {
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break;
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}
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txp = RING_GET_REQUEST(&netdev->tx_ring, cons++);
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} while (1);
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netdev->tx_ring.req_cons = cons;
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netif_schedule_work(netif);
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netif_put(netif);
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#else
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net_tx_response(netdev, txp, NETIF_RSP_ERROR);
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#endif
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}
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static void net_tx_packets(struct XenNetDev *netdev)
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{
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netif_tx_request_t txreq;
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RING_IDX rc, rp;
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void *page;
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void *tmpbuf = NULL;
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for (;;) {
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rc = netdev->tx_ring.req_cons;
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rp = netdev->tx_ring.sring->req_prod;
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xen_rmb(); /* Ensure we see queued requests up to 'rp'. */
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while ((rc != rp)) {
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if (RING_REQUEST_CONS_OVERFLOW(&netdev->tx_ring, rc)) {
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break;
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}
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memcpy(&txreq, RING_GET_REQUEST(&netdev->tx_ring, rc), sizeof(txreq));
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netdev->tx_ring.req_cons = ++rc;
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#if 1
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/* should not happen in theory, we don't announce the *
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* feature-{sg,gso,whatelse} flags in xenstore (yet?) */
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if (txreq.flags & NETTXF_extra_info) {
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xen_pv_printf(&netdev->xendev, 0, "FIXME: extra info flag\n");
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net_tx_error(netdev, &txreq, rc);
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continue;
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}
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if (txreq.flags & NETTXF_more_data) {
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xen_pv_printf(&netdev->xendev, 0, "FIXME: more data flag\n");
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net_tx_error(netdev, &txreq, rc);
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continue;
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}
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#endif
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if (txreq.size < 14) {
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xen_pv_printf(&netdev->xendev, 0, "bad packet size: %d\n",
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txreq.size);
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net_tx_error(netdev, &txreq, rc);
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continue;
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}
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if ((txreq.offset + txreq.size) > XEN_PAGE_SIZE) {
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xen_pv_printf(&netdev->xendev, 0, "error: page crossing\n");
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net_tx_error(netdev, &txreq, rc);
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continue;
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}
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xen_pv_printf(&netdev->xendev, 3,
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"tx packet ref %d, off %d, len %d, flags 0x%x%s%s%s%s\n",
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txreq.gref, txreq.offset, txreq.size, txreq.flags,
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(txreq.flags & NETTXF_csum_blank) ? " csum_blank" : "",
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(txreq.flags & NETTXF_data_validated) ? " data_validated" : "",
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(txreq.flags & NETTXF_more_data) ? " more_data" : "",
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(txreq.flags & NETTXF_extra_info) ? " extra_info" : "");
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page = xen_be_map_grant_ref(&netdev->xendev, txreq.gref,
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PROT_READ);
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if (page == NULL) {
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xen_pv_printf(&netdev->xendev, 0,
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"error: tx gref dereference failed (%d)\n",
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txreq.gref);
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net_tx_error(netdev, &txreq, rc);
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continue;
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}
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if (txreq.flags & NETTXF_csum_blank) {
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/* have read-only mapping -> can't fill checksum in-place */
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if (!tmpbuf) {
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tmpbuf = g_malloc(XEN_PAGE_SIZE);
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}
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memcpy(tmpbuf, page + txreq.offset, txreq.size);
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net_checksum_calculate(tmpbuf, txreq.size, CSUM_ALL);
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qemu_send_packet(qemu_get_queue(netdev->nic), tmpbuf,
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txreq.size);
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} else {
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qemu_send_packet(qemu_get_queue(netdev->nic),
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page + txreq.offset, txreq.size);
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}
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xen_be_unmap_grant_ref(&netdev->xendev, page, txreq.gref);
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net_tx_response(netdev, &txreq, NETIF_RSP_OKAY);
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}
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if (!netdev->tx_work) {
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break;
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}
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netdev->tx_work = 0;
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}
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g_free(tmpbuf);
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}
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/* ------------------------------------------------------------- */
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static void net_rx_response(struct XenNetDev *netdev,
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netif_rx_request_t *req, int8_t st,
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uint16_t offset, uint16_t size,
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uint16_t flags)
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{
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RING_IDX i = netdev->rx_ring.rsp_prod_pvt;
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netif_rx_response_t *resp;
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int notify;
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resp = RING_GET_RESPONSE(&netdev->rx_ring, i);
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resp->offset = offset;
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resp->flags = flags;
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resp->id = req->id;
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resp->status = (int16_t)size;
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if (st < 0) {
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resp->status = (int16_t)st;
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}
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xen_pv_printf(&netdev->xendev, 3,
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"rx response: idx %d, status %d, flags 0x%x\n",
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i, resp->status, resp->flags);
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netdev->rx_ring.rsp_prod_pvt = ++i;
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RING_PUSH_RESPONSES_AND_CHECK_NOTIFY(&netdev->rx_ring, notify);
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if (notify) {
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xen_pv_send_notify(&netdev->xendev);
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}
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}
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#define NET_IP_ALIGN 2
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static ssize_t net_rx_packet(NetClientState *nc, const uint8_t *buf, size_t size)
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{
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struct XenNetDev *netdev = qemu_get_nic_opaque(nc);
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netif_rx_request_t rxreq;
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RING_IDX rc, rp;
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void *page;
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if (netdev->xendev.be_state != XenbusStateConnected) {
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return -1;
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}
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rc = netdev->rx_ring.req_cons;
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rp = netdev->rx_ring.sring->req_prod;
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xen_rmb(); /* Ensure we see queued requests up to 'rp'. */
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if (rc == rp || RING_REQUEST_CONS_OVERFLOW(&netdev->rx_ring, rc)) {
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return 0;
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}
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if (size > XEN_PAGE_SIZE - NET_IP_ALIGN) {
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xen_pv_printf(&netdev->xendev, 0, "packet too big (%lu > %ld)",
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(unsigned long)size, XEN_PAGE_SIZE - NET_IP_ALIGN);
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return -1;
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}
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memcpy(&rxreq, RING_GET_REQUEST(&netdev->rx_ring, rc), sizeof(rxreq));
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netdev->rx_ring.req_cons = ++rc;
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page = xen_be_map_grant_ref(&netdev->xendev, rxreq.gref, PROT_WRITE);
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if (page == NULL) {
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xen_pv_printf(&netdev->xendev, 0,
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"error: rx gref dereference failed (%d)\n",
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rxreq.gref);
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net_rx_response(netdev, &rxreq, NETIF_RSP_ERROR, 0, 0, 0);
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return -1;
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}
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memcpy(page + NET_IP_ALIGN, buf, size);
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xen_be_unmap_grant_ref(&netdev->xendev, page, rxreq.gref);
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net_rx_response(netdev, &rxreq, NETIF_RSP_OKAY, NET_IP_ALIGN, size, 0);
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return size;
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}
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/* ------------------------------------------------------------- */
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static NetClientInfo net_xen_info = {
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.type = NET_CLIENT_DRIVER_NIC,
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.size = sizeof(NICState),
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.receive = net_rx_packet,
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};
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static int net_init(struct XenLegacyDevice *xendev)
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{
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struct XenNetDev *netdev = container_of(xendev, struct XenNetDev, xendev);
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/* read xenstore entries */
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if (netdev->mac == NULL) {
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netdev->mac = xenstore_read_be_str(&netdev->xendev, "mac");
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}
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/* do we have all we need? */
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if (netdev->mac == NULL) {
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return -1;
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}
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if (net_parse_macaddr(netdev->conf.macaddr.a, netdev->mac) < 0) {
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return -1;
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}
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netdev->nic = qemu_new_nic(&net_xen_info, &netdev->conf,
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"xen", NULL, netdev);
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qemu_set_info_str(qemu_get_queue(netdev->nic),
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"nic: xenbus vif macaddr=%s", netdev->mac);
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/* fill info */
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xenstore_write_be_int(&netdev->xendev, "feature-rx-copy", 1);
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xenstore_write_be_int(&netdev->xendev, "feature-rx-flip", 0);
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return 0;
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}
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static int net_connect(struct XenLegacyDevice *xendev)
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{
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struct XenNetDev *netdev = container_of(xendev, struct XenNetDev, xendev);
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int rx_copy;
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if (xenstore_read_fe_int(&netdev->xendev, "tx-ring-ref",
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&netdev->tx_ring_ref) == -1) {
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return -1;
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}
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if (xenstore_read_fe_int(&netdev->xendev, "rx-ring-ref",
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&netdev->rx_ring_ref) == -1) {
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return 1;
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}
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if (xenstore_read_fe_int(&netdev->xendev, "event-channel",
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&netdev->xendev.remote_port) == -1) {
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return -1;
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}
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if (xenstore_read_fe_int(&netdev->xendev, "request-rx-copy", &rx_copy) == -1) {
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rx_copy = 0;
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}
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if (rx_copy == 0) {
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xen_pv_printf(&netdev->xendev, 0,
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"frontend doesn't support rx-copy.\n");
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return -1;
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}
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netdev->txs = xen_be_map_grant_ref(&netdev->xendev,
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netdev->tx_ring_ref,
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PROT_READ | PROT_WRITE);
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if (!netdev->txs) {
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return -1;
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}
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netdev->rxs = xen_be_map_grant_ref(&netdev->xendev,
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netdev->rx_ring_ref,
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PROT_READ | PROT_WRITE);
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if (!netdev->rxs) {
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xen_be_unmap_grant_ref(&netdev->xendev, netdev->txs,
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netdev->tx_ring_ref);
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netdev->txs = NULL;
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return -1;
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}
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BACK_RING_INIT(&netdev->tx_ring, netdev->txs, XEN_PAGE_SIZE);
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BACK_RING_INIT(&netdev->rx_ring, netdev->rxs, XEN_PAGE_SIZE);
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xen_be_bind_evtchn(&netdev->xendev);
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xen_pv_printf(&netdev->xendev, 1, "ok: tx-ring-ref %d, rx-ring-ref %d, "
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"remote port %d, local port %d\n",
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netdev->tx_ring_ref, netdev->rx_ring_ref,
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netdev->xendev.remote_port, netdev->xendev.local_port);
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net_tx_packets(netdev);
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return 0;
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}
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static void net_disconnect(struct XenLegacyDevice *xendev)
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{
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struct XenNetDev *netdev = container_of(xendev, struct XenNetDev, xendev);
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xen_pv_unbind_evtchn(&netdev->xendev);
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if (netdev->txs) {
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xen_be_unmap_grant_ref(&netdev->xendev, netdev->txs,
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netdev->tx_ring_ref);
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netdev->txs = NULL;
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}
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if (netdev->rxs) {
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xen_be_unmap_grant_ref(&netdev->xendev, netdev->rxs,
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netdev->rx_ring_ref);
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netdev->rxs = NULL;
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}
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}
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static void net_event(struct XenLegacyDevice *xendev)
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{
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struct XenNetDev *netdev = container_of(xendev, struct XenNetDev, xendev);
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net_tx_packets(netdev);
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qemu_flush_queued_packets(qemu_get_queue(netdev->nic));
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}
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static int net_free(struct XenLegacyDevice *xendev)
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{
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struct XenNetDev *netdev = container_of(xendev, struct XenNetDev, xendev);
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if (netdev->nic) {
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qemu_del_nic(netdev->nic);
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netdev->nic = NULL;
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}
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g_free(netdev->mac);
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netdev->mac = NULL;
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return 0;
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}
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/* ------------------------------------------------------------- */
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struct XenDevOps xen_netdev_ops = {
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.size = sizeof(struct XenNetDev),
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.flags = DEVOPS_FLAG_NEED_GNTDEV,
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.init = net_init,
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.initialise = net_connect,
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.event = net_event,
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.disconnect = net_disconnect,
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.free = net_free,
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};
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