void shutdown_netfront(struct netfront_dev *dev)
{
char* err = NULL;
XenbusState state;
char path[strlen(dev->backend) + 1 + 5 + 1];
char nodename[strlen(dev->nodename) + 1 + 5 + 1];
printk("close network: backend at %s\n",dev->backend);
snprintf(path, sizeof(path), "%s/state", dev->backend);
snprintf(nodename, sizeof(nodename), "%s/state", dev->nodename);
if ((err = xenbus_switch_state(XBT_NIL, nodename, XenbusStateClosing)) != NULL) {
printk("shutdown_netfront: error changing state to %d: %s\n",
XenbusStateClosing, err);
goto close;
}
state = xenbus_read_integer(path);
while (err == NULL && state < XenbusStateClosing)
err = xenbus_wait_for_state_change(path, &state, &dev->events);
if (err) free(err);
if ((err = xenbus_switch_state(XBT_NIL, nodename, XenbusStateClosed)) != NULL) {
printk("shutdown_netfront: error changing state to %d: %s\n",
XenbusStateClosed, err);
goto close;
}
state = xenbus_read_integer(path);
while (state < XenbusStateClosed) {
err = xenbus_wait_for_state_change(path, &state, &dev->events);
if (err) free(err);
}
if ((err = xenbus_switch_state(XBT_NIL, nodename, XenbusStateInitialising)) != NULL) {
printk("shutdown_netfront: error changing state to %d: %s\n",
XenbusStateInitialising, err);
goto close;
}
err = NULL;
state = xenbus_read_integer(path);
while (err == NULL && (state < XenbusStateInitWait || state >= XenbusStateClosed))
err = xenbus_wait_for_state_change(path, &state, &dev->events);
close:
if (err) free(err);
xenbus_unwatch_path_token(XBT_NIL, path, path);
snprintf(path, sizeof(path), "%s/tx-ring-ref", nodename);
xenbus_rm(XBT_NIL, path);
snprintf(path, sizeof(path), "%s/rx-ring-ref", nodename);
xenbus_rm(XBT_NIL, path);
snprintf(path, sizeof(path), "%s/event-channel", nodename);
xenbus_rm(XBT_NIL, path);
snprintf(path, sizeof(path), "%s/request-rx-copy", nodename);
xenbus_rm(XBT_NIL, path);
if (!err)
free_netfront(dev);
}
void shutdown_netfront(struct netfront_dev *dev)
{
char* err;
char *nodename = dev->nodename;
char path[strlen(dev->backend) + 1 + 5 + 1];
printk("close network: backend at %s\n",dev->backend);
snprintf(path, sizeof(path), "%s/state", dev->backend);
err = xenbus_printf(XBT_NIL, nodename, "state", "%u", 5); /* closing */
xenbus_wait_for_value(path, "5", &dev->events);
err = xenbus_printf(XBT_NIL, nodename, "state", "%u", 6);
xenbus_wait_for_value(path, "6", &dev->events);
err = xenbus_printf(XBT_NIL, nodename, "state", "%u", 1);
xenbus_wait_for_value(path, "2", &dev->events);
xenbus_unwatch_path(XBT_NIL, path);
snprintf(path, sizeof(path), "%s/tx-ring-ref", nodename);
xenbus_rm(XBT_NIL, path);
snprintf(path, sizeof(path), "%s/rx-ring-ref", nodename);
xenbus_rm(XBT_NIL, path);
snprintf(path, sizeof(path), "%s/event-channel", nodename);
xenbus_rm(XBT_NIL, path);
snprintf(path, sizeof(path), "%s/request-rx-copy", nodename);
xenbus_rm(XBT_NIL, path);
free_netfront(dev);
}
struct netfront_dev *init_netfront(char *_nodename, void (*thenetif_rx)(unsigned char* data, int len), unsigned char rawmac[6], char **ip)
{
xenbus_transaction_t xbt;
char* err;
char* message=NULL;
struct netif_tx_sring *txs;
struct netif_rx_sring *rxs;
int retry=0;
int i;
char* msg;
char nodename[256];
char path[256];
struct netfront_dev *dev;
static int netfrontends = 0;
if (!_nodename)
snprintf(nodename, sizeof(nodename), "device/vif/%d", netfrontends);
else
strncpy(nodename, _nodename, strlen(nodename));
netfrontends++;
if (!thenetif_rx)
thenetif_rx = netif_rx;
printk("************************ NETFRONT for %s **********\n\n\n", nodename);
dev = malloc(sizeof(*dev));
memset(dev, 0, sizeof(*dev));
dev->nodename = strdup(nodename);
#ifdef HAVE_LIBC
dev->fd = -1;
#endif
printk("net TX ring size %d\n", NET_TX_RING_SIZE);
printk("net RX ring size %d\n", NET_RX_RING_SIZE);
init_SEMAPHORE(&dev->tx_sem, NET_TX_RING_SIZE);
for(i=0;i<NET_TX_RING_SIZE;i++)
{
add_id_to_freelist(i,dev->tx_freelist);
dev->tx_buffers[i].page = NULL;
}
for(i=0;i<NET_RX_RING_SIZE;i++)
{
/* TODO: that's a lot of memory */
dev->rx_buffers[i].page = (char*)alloc_page();
}
snprintf(path, sizeof(path), "%s/backend-id", nodename);
dev->dom = xenbus_read_integer(path);
#ifdef HAVE_LIBC
if (thenetif_rx == NETIF_SELECT_RX)
evtchn_alloc_unbound(dev->dom, netfront_select_handler, dev, &dev->evtchn);
else
#endif
evtchn_alloc_unbound(dev->dom, netfront_handler, dev, &dev->evtchn);
txs = (struct netif_tx_sring *) alloc_page();
rxs = (struct netif_rx_sring *) alloc_page();
memset(txs,0,PAGE_SIZE);
memset(rxs,0,PAGE_SIZE);
SHARED_RING_INIT(txs);
SHARED_RING_INIT(rxs);
FRONT_RING_INIT(&dev->tx, txs, PAGE_SIZE);
FRONT_RING_INIT(&dev->rx, rxs, PAGE_SIZE);
dev->tx_ring_ref = gnttab_grant_access(dev->dom,virt_to_mfn(txs),0);
dev->rx_ring_ref = gnttab_grant_access(dev->dom,virt_to_mfn(rxs),0);
init_rx_buffers(dev);
dev->netif_rx = thenetif_rx;
dev->events = NULL;
again:
err = xenbus_transaction_start(&xbt);
if (err) {
printk("starting transaction\n");
}
err = xenbus_printf(xbt, nodename, "tx-ring-ref","%u",
dev->tx_ring_ref);
if (err) {
message = "writing tx ring-ref";
goto abort_transaction;
}
err = xenbus_printf(xbt, nodename, "rx-ring-ref","%u",
dev->rx_ring_ref);
if (err) {
message = "writing rx ring-ref";
goto abort_transaction;
}
err = xenbus_printf(xbt, nodename,
"event-channel", "%u", dev->evtchn);
if (err) {
message = "writing event-channel";
goto abort_transaction;
}
err = xenbus_printf(xbt, nodename, "request-rx-copy", "%u", 1);
if (err) {
message = "writing request-rx-copy";
goto abort_transaction;
}
snprintf(path, sizeof(path), "%s/state", nodename);
err = xenbus_switch_state(xbt, path, XenbusStateConnected);
if (err) {
message = "switching state";
goto abort_transaction;
}
err = xenbus_transaction_end(xbt, 0, &retry);
if (retry) {
goto again;
printk("completing transaction\n");
}
goto done;
abort_transaction:
xenbus_transaction_end(xbt, 1, &retry);
goto error;
done:
snprintf(path, sizeof(path), "%s/backend", nodename);
msg = xenbus_read(XBT_NIL, path, &dev->backend);
snprintf(path, sizeof(path), "%s/mac", nodename);
msg = xenbus_read(XBT_NIL, path, &dev->mac);
if ((dev->backend == NULL) || (dev->mac == NULL)) {
printk("%s: backend/mac failed\n", __func__);
goto error;
}
printk("backend at %s\n",dev->backend);
printk("mac is %s\n",dev->mac);
{
XenbusState state;
char path[strlen(dev->backend) + 1 + 5 + 1];
snprintf(path, sizeof(path), "%s/state", dev->backend);
xenbus_watch_path_token(XBT_NIL, path, path, &dev->events);
err = NULL;
state = xenbus_read_integer(path);
while (err == NULL && state < XenbusStateConnected)
err = xenbus_wait_for_state_change(path, &state, &dev->events);
if (state != XenbusStateConnected) {
printk("backend not avalable, state=%d\n", state);
xenbus_unwatch_path(XBT_NIL, path);
goto error;
}
if (ip) {
snprintf(path, sizeof(path), "%s/ip", dev->backend);
xenbus_read(XBT_NIL, path, ip);
}
}
printk("**************************\n");
unmask_evtchn(dev->evtchn);
/* Special conversion specifier 'hh' needed for __ia64__. Without
this mini-os panics with 'Unaligned reference'. */
if (rawmac)
sscanf(dev->mac,"%hhx:%hhx:%hhx:%hhx:%hhx:%hhx",
&rawmac[0],
&rawmac[1],
&rawmac[2],
&rawmac[3],
&rawmac[4],
&rawmac[5]);
return dev;
error:
free_netfront(dev);
return NULL;
}
static struct netfront_dev *_init_netfront(struct netfront_dev *dev,
unsigned char rawmac[6],
char **ip)
{
xenbus_transaction_t xbt;
char* err = NULL;
const char* message=NULL;
struct netif_tx_sring *txs;
struct netif_rx_sring *rxs;
int feature_split_evtchn;
int retry=0;
int i;
char* msg = NULL;
char path[256];
snprintf(path, sizeof(path), "%s/backend-id", dev->nodename);
dev->dom = xenbus_read_integer(path);
snprintf(path, sizeof(path), "%s/backend", dev->nodename);
msg = xenbus_read(XBT_NIL, path, &dev->backend);
snprintf(path, sizeof(path), "%s/mac", dev->nodename);
msg = xenbus_read(XBT_NIL, path, &dev->mac);
if ((dev->backend == NULL) || (dev->mac == NULL)) {
printk("%s: backend/mac failed\n", __func__);
goto error;
}
#ifdef CONFIG_NETMAP
snprintf(path, sizeof(path), "%s/feature-netmap", dev->backend);
dev->netmap = xenbus_read_integer(path) > 0 ? 1 : 0;
if (dev->netmap) {
dev->na = init_netfront_netmap(dev, dev->netif_rx);
goto skip;
}
#endif
/* Check feature-split-event-channels */
snprintf(path, sizeof(path), "%s/feature-split-event-channels",
dev->backend);
feature_split_evtchn = xenbus_read_integer(path) > 0 ? 1 : 0;
#ifdef HAVE_LIBC
/* Force the use of a single event channel */
if (dev->netif_rx == NETIF_SELECT_RX)
feature_split_evtchn = 0;
#endif
printk("************************ NETFRONT for %s **********\n\n\n",
dev->nodename);
init_SEMAPHORE(&dev->tx_sem, NET_TX_RING_SIZE);
for(i=0;i<NET_TX_RING_SIZE;i++)
{
add_id_to_freelist(i,dev->tx_freelist);
#if defined CONFIG_NETFRONT_PERSISTENT_GRANTS || !defined CONFIG_NETFRONT_LWIP_ONLY
dev->tx_buffers[i].page = (void*)alloc_page();
BUG_ON(dev->tx_buffers[i].page == NULL);
#ifdef CONFIG_NETFRONT_PERSISTENT_GRANTS
dev->tx_buffers[i].gref = gnttab_grant_access(dev->dom,
virt_to_mfn(dev->tx_buffers[i].page), 0);
BUG_ON(dev->tx_buffers[i].gref == GRANT_INVALID_REF);
dprintk("tx[%d]: page = %p, gref=0x%x\n", i, dev->tx_buffers[i].page, dev->tx_buffers[i].gref);
#endif
#endif
}
#if defined CONFIG_NETFRONT_PERSISTENT_GRANTS || !defined CONFIG_NETFRONT_LWIP_ONLY
printk("net TX ring size %d, %lu KB\n", NET_TX_RING_SIZE, (unsigned long)(NET_TX_RING_SIZE * PAGE_SIZE)/1024);
#else
printk("net TX ring size %d\n", NET_TX_RING_SIZE);
#endif
#ifdef CONFIG_NETFRONT_PERSISTENT_GRANTS
for(i=0;i<NET_RX_RING_SIZE;i++)
{
/* TODO: that's a lot of memory */
dev->rx_buffers[i].page = (void*)alloc_page();
BUG_ON(dev->rx_buffers[i].page == NULL);
dprintk("rx[%d]: page = %p\n", i, dev->rx_buffers[i].page);
}
printk("net RX ring size %d, %lu KB\n", NET_RX_RING_SIZE, (unsigned long)(NET_RX_RING_SIZE * PAGE_SIZE)/1024);
#else
for(i=0;i<NET_RX_RING_SIZE;i++)
dev->rx_buffers[i] = NULL;
for(i=0;i<NET_RX_BUFFERS;i++)
{
/* allocate rx buffer pool */
dev->rx_buffer_pool[i].page = (void*)alloc_page();
BUG_ON(dev->rx_buffer_pool[i].page == NULL);
dprintk("rx[%d]: page = %p\n", i, dev->rx_buffer_pool[i].page);
add_id_to_freelist(i,dev->rx_freelist);
}
dev->rx_avail = NET_RX_BUFFERS;
printk("net RX ring size %d, %lu KB buffer space\n", NET_RX_RING_SIZE, (unsigned long)(NET_RX_BUFFERS * PAGE_SIZE)/1024);
#endif
if (feature_split_evtchn) {
evtchn_alloc_unbound(dev->dom, netfront_tx_handler, dev,
&dev->tx_evtchn);
evtchn_alloc_unbound(dev->dom, netfront_rx_handler, dev,
&dev->rx_evtchn);
printk("split event channels enabled\n");
} else {
#ifdef HAVE_LIBC
if (dev->netif_rx == NETIF_SELECT_RX)
evtchn_alloc_unbound(dev->dom, netfront_select_handler,
dev, &dev->tx_evtchn);
else
#endif
evtchn_alloc_unbound(dev->dom, netfront_handler,
dev, &dev->tx_evtchn);
dev->rx_evtchn = dev->tx_evtchn;
}
#ifdef CONFIG_NETFRONT_PERSISTENT_GRANTS
printk("persistent grants enabled\n");
#endif
txs = (struct netif_tx_sring *) alloc_page();
rxs = (struct netif_rx_sring *) alloc_page();
memset(txs,0,PAGE_SIZE);
memset(rxs,0,PAGE_SIZE);
SHARED_RING_INIT(txs);
SHARED_RING_INIT(rxs);
FRONT_RING_INIT(&dev->tx, txs, PAGE_SIZE);
FRONT_RING_INIT(&dev->rx, rxs, PAGE_SIZE);
dev->tx_ring_ref = gnttab_grant_access(dev->dom,virt_to_mfn(txs),0);
BUG_ON(dev->tx_ring_ref == GRANT_INVALID_REF);
dev->rx_ring_ref = gnttab_grant_access(dev->dom,virt_to_mfn(rxs),0);
BUG_ON(dev->rx_ring_ref == GRANT_INVALID_REF);
init_rx_buffers(dev);
dev->events = NULL;
again:
err = xenbus_transaction_start(&xbt);
if (err) {
printk("starting transaction\n");
free(err);
}
err = xenbus_printf(xbt, dev->nodename, "tx-ring-ref","%u",
dev->tx_ring_ref);
if (err) {
message = "writing tx ring-ref";
goto abort_transaction;
}
err = xenbus_printf(xbt, dev->nodename, "rx-ring-ref","%u",
dev->rx_ring_ref);
if (err) {
message = "writing rx ring-ref";
goto abort_transaction;
}
if (feature_split_evtchn) {
err = xenbus_printf(xbt, dev->nodename,
"event-channel-tx", "%u", dev->tx_evtchn);
if (err) {
message = "writing event-channel-tx";
goto abort_transaction;
}
err = xenbus_printf(xbt, dev->nodename,
"event-channel-rx", "%u", dev->rx_evtchn);
if (err) {
message = "writing event-channel-rx";
goto abort_transaction;
}
} else {
err = xenbus_printf(xbt, dev->nodename,
"event-channel", "%u", dev->tx_evtchn);
if (err) {
message = "writing event-channel";
goto abort_transaction;
}
}
err = xenbus_printf(xbt, dev->nodename, "feature-rx-notify", "%u", 1);
if (err) {
message = "writing feature-rx-notify";
goto abort_transaction;
}
#ifdef CONFIG_NETFRONT_PERSISTENT_GRANTS
err = xenbus_printf(xbt, dev->nodename, "feature-persistent", "%u", 1);
if (err) {
message = "writing feature-persistent";
goto abort_transaction;
}
#endif
err = xenbus_printf(xbt, dev->nodename, "request-rx-copy", "%u", 1);
if (err) {
message = "writing request-rx-copy";
goto abort_transaction;
}
#if defined(CONFIG_NETFRONT_GSO) && defined(HAVE_LWIP)
err = xenbus_printf(xbt, dev->nodename, "feature-sg", "%u", 1);
if (err) {
message = "writing feature-sg";
goto abort_transaction;
}
err = xenbus_printf(xbt, dev->nodename, "feature-gso-tcpv4", "%u", 1);
if (err) {
message = "writing feature-gso-tcpv4";
goto abort_transaction;
}
err = xenbus_printf(xbt, dev->nodename, "feature-gso-tcpv6", "%u", 1);
if (err) {
message = "writing feature-gso-tcpv6";
goto abort_transaction;
}
#endif
snprintf(path, sizeof(path), "%s/state", dev->nodename);
err = xenbus_switch_state(xbt, path, XenbusStateConnected);
if (err) {
message = "switching state";
goto abort_transaction;
}
err = xenbus_transaction_end(xbt, 0, &retry);
free(err);
if (retry) {
goto again;
printk("completing transaction\n");
}
goto done;
abort_transaction:
free(err);
err = xenbus_transaction_end(xbt, 1, &retry);
printk("Abort transaction %s\n", message);
goto error;
done:
snprintf(path, sizeof(path), "%s/mac", dev->nodename);
msg = xenbus_read(XBT_NIL, path, &dev->mac);
if (dev->mac == NULL) {
printk("%s: backend/mac failed\n", __func__);
goto error;
}
printk("backend at %s\n",dev->backend);
printk("mac is %s\n",dev->mac);
{
XenbusState state;
char path[strlen(dev->backend) + strlen("/state") + 1];
snprintf(path, sizeof(path), "%s/state", dev->backend);
xenbus_watch_path_token(XBT_NIL, path, path, &dev->events);
err = NULL;
state = xenbus_read_integer(path);
while (err == NULL && state < XenbusStateConnected)
err = xenbus_wait_for_state_change(path, &state, &dev->events);
if (state != XenbusStateConnected) {
printk("backend not avalable, state=%d\n", state);
xenbus_unwatch_path_token(XBT_NIL, path, path);
goto error;
}
if (ip) {
snprintf(path, sizeof(path), "%s/ip", dev->backend);
xenbus_read(XBT_NIL, path, ip);
}
}
printk("**************************\n");
unmask_evtchn(dev->tx_evtchn);
if (feature_split_evtchn)
unmask_evtchn(dev->rx_evtchn);
#ifdef CONFIG_NETMAP
skip:
if (dev->netmap)
connect_netfront(dev);
#endif
/* Special conversion specifier 'hh' needed for __ia64__. Without
this mini-os panics with 'Unaligned reference'. */
if (rawmac)
sscanf(dev->mac,"%hhx:%hhx:%hhx:%hhx:%hhx:%hhx",
&rawmac[0],
&rawmac[1],
&rawmac[2],
&rawmac[3],
&rawmac[4],
&rawmac[5]);
#ifdef CONFIG_SELECT_POLL
dev->fd = alloc_fd(FTYPE_TAP);
files[dev->fd].read = 0;
#endif
#ifdef CONFIG_NETFRONT_STATS
netfront_reset_txcounters(dev);
#endif
return dev;
error:
free(msg);
free(err);
free_netfront(dev);
return NULL;
}