411 lines
13 KiB
C
411 lines
13 KiB
C
/*
|
|
* 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 "qemu/osdep.h"
|
|
#include <sys/socket.h>
|
|
#include <sys/ioctl.h>
|
|
#include <sys/wait.h>
|
|
|
|
#include "net/net.h"
|
|
#include "net/checksum.h"
|
|
#include "net/util.h"
|
|
#include "hw/xen/xen-legacy-backend.h"
|
|
|
|
#include "hw/xen/interface/io/netif.h"
|
|
|
|
/* ------------------------------------------------------------- */
|
|
|
|
struct XenNetDev {
|
|
struct XenLegacyDevice 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_pv_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_pv_printf(&netdev->xendev, 0, "FIXME: extra info flag\n");
|
|
net_tx_error(netdev, &txreq, rc);
|
|
continue;
|
|
}
|
|
if (txreq.flags & NETTXF_more_data) {
|
|
xen_pv_printf(&netdev->xendev, 0, "FIXME: more data flag\n");
|
|
net_tx_error(netdev, &txreq, rc);
|
|
continue;
|
|
}
|
|
#endif
|
|
|
|
if (txreq.size < 14) {
|
|
xen_pv_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_pv_printf(&netdev->xendev, 0, "error: page crossing\n");
|
|
net_tx_error(netdev, &txreq, rc);
|
|
continue;
|
|
}
|
|
|
|
xen_pv_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 = xen_be_map_grant_ref(&netdev->xendev, txreq.gref,
|
|
PROT_READ);
|
|
if (page == NULL) {
|
|
xen_pv_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);
|
|
}
|
|
xen_be_unmap_grant_ref(&netdev->xendev, page);
|
|
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_pv_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_pv_send_notify(&netdev->xendev);
|
|
}
|
|
}
|
|
|
|
#define NET_IP_ALIGN 2
|
|
|
|
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_pv_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 = xen_be_map_grant_ref(&netdev->xendev, rxreq.gref, PROT_WRITE);
|
|
if (page == NULL) {
|
|
xen_pv_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);
|
|
xen_be_unmap_grant_ref(&netdev->xendev, page);
|
|
net_rx_response(netdev, &rxreq, NETIF_RSP_OKAY, NET_IP_ALIGN, size, 0);
|
|
|
|
return size;
|
|
}
|
|
|
|
/* ------------------------------------------------------------- */
|
|
|
|
static NetClientInfo net_xen_info = {
|
|
.type = NET_CLIENT_DRIVER_NIC,
|
|
.size = sizeof(NICState),
|
|
.receive = net_rx_packet,
|
|
};
|
|
|
|
static int net_init(struct XenLegacyDevice *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 XenLegacyDevice *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_pv_printf(&netdev->xendev, 0,
|
|
"frontend doesn't support rx-copy.\n");
|
|
return -1;
|
|
}
|
|
|
|
netdev->txs = xen_be_map_grant_ref(&netdev->xendev,
|
|
netdev->tx_ring_ref,
|
|
PROT_READ | PROT_WRITE);
|
|
if (!netdev->txs) {
|
|
return -1;
|
|
}
|
|
netdev->rxs = xen_be_map_grant_ref(&netdev->xendev,
|
|
netdev->rx_ring_ref,
|
|
PROT_READ | PROT_WRITE);
|
|
if (!netdev->rxs) {
|
|
xen_be_unmap_grant_ref(&netdev->xendev, netdev->txs);
|
|
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_pv_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 XenLegacyDevice *xendev)
|
|
{
|
|
struct XenNetDev *netdev = container_of(xendev, struct XenNetDev, xendev);
|
|
|
|
xen_pv_unbind_evtchn(&netdev->xendev);
|
|
|
|
if (netdev->txs) {
|
|
xen_be_unmap_grant_ref(&netdev->xendev, netdev->txs);
|
|
netdev->txs = NULL;
|
|
}
|
|
if (netdev->rxs) {
|
|
xen_be_unmap_grant_ref(&netdev->xendev, netdev->rxs);
|
|
netdev->rxs = NULL;
|
|
}
|
|
}
|
|
|
|
static void net_event(struct XenLegacyDevice *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 XenLegacyDevice *xendev)
|
|
{
|
|
struct XenNetDev *netdev = container_of(xendev, struct XenNetDev, xendev);
|
|
|
|
if (netdev->nic) {
|
|
qemu_del_nic(netdev->nic);
|
|
netdev->nic = NULL;
|
|
}
|
|
g_free(netdev->mac);
|
|
netdev->mac = NULL;
|
|
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,
|
|
};
|