void shutdown_fbfront(struct fbfront_dev *dev)
{
char* err;
char *nodename = dev->nodename;
char path[strlen(dev->backend) + 1 + 5 + 1];
printk("close fb: 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);
// does not work yet
//xenbus_wait_for_value(path, "2", &dev->events);
xenbus_unwatch_path(XBT_NIL, path);
snprintf(path, sizeof(path), "%s/page-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/protocol", nodename);
xenbus_rm(XBT_NIL, path);
snprintf(path, sizeof(path), "%s/feature-update", nodename);
xenbus_rm(XBT_NIL, path);
unbind_evtchn(dev->evtchn);
free_fbfront(dev);
}
static void free_netfront(struct netfront_dev *dev)
{
int i;
free(dev->mac);
free(dev->backend);
#ifdef CONFIG_NETMAP
if (dev->netmap)
return;
#endif
for(i=0;i<NET_TX_RING_SIZE;i++)
down(&dev->tx_sem);
mask_evtchn(dev->evtchn);
gnttab_end_access(dev->rx_ring_ref);
gnttab_end_access(dev->tx_ring_ref);
free_page(dev->rx.sring);
free_page(dev->tx.sring);
unbind_evtchn(dev->evtchn);
for(i=0;i<NET_RX_RING_SIZE;i++) {
gnttab_end_access(dev->rx_buffers[i].gref);
free_page(dev->rx_buffers[i].page);
}
for(i=0;i<NET_TX_RING_SIZE;i++) {
if (dev->tx_buffers[i].page) {
gnttab_end_access(dev->tx_buffers[i].gref);
free_page(dev->tx_buffers[i].page);
}
}
}
static void free_netfront(struct netfront_dev *dev)
{
int i;
for(i=0;i<NET_TX_RING_SIZE;i++)
down(&dev->tx_sem);
mask_evtchn(dev->evtchn);
free(dev->mac);
free(dev->backend);
gnttab_end_access(dev->rx_ring_ref);
gnttab_end_access(dev->tx_ring_ref);
free_page(dev->rx.sring);
free_page(dev->tx.sring);
unbind_evtchn(dev->evtchn);
for(i=0;i<NET_RX_RING_SIZE;i++) {
gnttab_end_access(dev->rx_buffers[i].gref);
free_page(dev->rx_buffers[i].page);
}
for(i=0;i<NET_TX_RING_SIZE;i++)
if (dev->tx_buffers[i].page)
free_page(dev->tx_buffers[i].page);
free(dev->nodename);
free(dev);
}
void arch_unbind_ports(void)
{
if(debug_port != -1)
{
mask_evtchn(debug_port);
unbind_evtchn(debug_port);
}
}
int xc_evtchn_close(int xce_handle)
{
int i;
for (i = 0; i < MAX_EVTCHN_PORTS; i++)
if (files[xce_handle].evtchn.ports[i].bound)
unbind_evtchn(files[xce_handle].evtchn.ports[i].port);
files[xce_handle].type = FTYPE_NONE;
return 0;
}
static void free_kbdfront(struct kbdfront_dev *dev)
{
mask_evtchn(dev->evtchn);
free(dev->backend);
free_page(dev->page);
unbind_evtchn(dev->evtchn);
free(dev->nodename);
free(dev);
}
static void free_blkfront(struct blkfront_dev *dev)
{
mask_evtchn(dev->evtchn);
free(dev->backend);
gnttab_end_access(dev->ring_ref);
free_page(dev->ring.sring);
unbind_evtchn(dev->evtchn);
free(dev->nodename);
free(dev);
}
static void free_pcifront(struct pcifront_dev *dev)
{
mask_evtchn(dev->evtchn);
free(dev->backend);
gnttab_end_access(dev->info_ref);
free_page(dev->info);
unbind_evtchn(dev->evtchn);
free(dev->nodename);
free(dev);
}
static int tpmfront_connect(struct tpmfront_dev* dev)
{
char* err;
/* Create shared page */
dev->page = (vtpm_shared_page_t*) alloc_page();
if(dev->page == NULL) {
TPMFRONT_ERR("Unable to allocate page for shared memory\n");
goto error;
}
memset(dev->page, 0, PAGE_SIZE);
dev->ring_ref = gnttab_grant_access(dev->bedomid, virt_to_mfn(dev->page), 0);
TPMFRONT_DEBUG("grant ref is %lu\n", (unsigned long) dev->ring_ref);
/*Create event channel */
if(evtchn_alloc_unbound(dev->bedomid, tpmfront_handler, dev, &dev->evtchn)) {
TPMFRONT_ERR("Unable to allocate event channel\n");
goto error_postmap;
}
unmask_evtchn(dev->evtchn);
TPMFRONT_DEBUG("event channel is %lu\n", (unsigned long) dev->evtchn);
/* Write the entries to xenstore */
if(publish_xenbus(dev)) {
goto error_postevtchn;
}
/* Change state to connected */
dev->state = XenbusStateConnected;
/* Tell the backend that we are ready */
if((err = xenbus_printf(XBT_NIL, dev->nodename, "state", "%u", dev->state))) {
TPMFRONT_ERR("Unable to write to xenstore %s/state, value=%u", dev->nodename, XenbusStateConnected);
free(err);
goto error;
}
return 0;
error_postevtchn:
mask_evtchn(dev->evtchn);
unbind_evtchn(dev->evtchn);
error_postmap:
gnttab_end_access(dev->ring_ref);
free_page(dev->page);
error:
return -1;
}
int xc_evtchn_unbind(int xce_handle, evtchn_port_t port)
{
int i;
for (i = 0; i < MAX_EVTCHN_PORTS; i++)
if (files[xce_handle].evtchn.ports[i].port == port) {
files[xce_handle].evtchn.ports[i].port = -1;
break;
}
if (i == MAX_EVTCHN_PORTS) {
printf("Warning: couldn't find port %"PRId32" for xc handle %x\n", port, xce_handle);
errno = -EINVAL;
return -1;
}
files[xce_handle].evtchn.ports[i].bound = 0;
unbind_evtchn(port);
return 0;
}
void free_consfront(struct consfront_dev *dev)
{
char* err = NULL;
XenbusState state;
char path[strlen(dev->backend) + 1 + 5 + 1];
char nodename[strlen(dev->nodename) + 1 + 5 + 1];
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("free_consfront: 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("free_consfront: error changing state to %d: %s\n",
XenbusStateClosed, err);
goto close;
}
close:
if (err) free(err);
xenbus_unwatch_path_token(XBT_NIL, path, path);
mask_evtchn(dev->evtchn);
unbind_evtchn(dev->evtchn);
free(dev->backend);
free(dev->nodename);
gnttab_end_access(dev->ring_ref);
free_page(dev->ring);
free(dev);
}
/**
* Transmit function for pbufs which can handle checksum and segmentation offloading for TCPv4 and TCPv6
*/
err_t netfront_xmit_pbuf(struct netfront_dev *dev, struct pbuf *p, int co_type, int push)
{
struct netif_tx_request *first_tx;
struct netif_extra_info *gso;
int slots;
int used = 0;
#ifdef CONFIG_NETFRONT_GSO
int sego;
#endif /* CONFIG_NETFRONT_GSO */
#ifdef CONFIG_NETFRONT_WAITFORTX
unsigned long flags;
DEFINE_WAIT(w);
#endif /* CONFIG_NETFRONT_WAITFORTX */
/* Counts how many slots we require for this buf */
slots = netfront_count_pbuf_slots(dev, p);
#ifdef CONFIG_NETFRONT_GSO
#if TCP_GSO /* GSO flag is only available if lwIP is built with GSO support */
sego = (p->flags & PBUF_FLAG_GSO) ? 1 : 0;
#else
sego = 0;
#endif
/* GSO requires checksum offloading set */
BUG_ON(sego && !(co_type & (XEN_NETIF_GSO_TYPE_TCPV4 | XEN_NETIF_GSO_TYPE_TCPV6)));
#endif /* CONFIG_NETFRONT_GSO */
/* Checks if there are enough requests for this many slots (gso requires one slot more) */
#ifdef CONFIG_NETFRONT_GSO
BUG_ON(!netfront_tx_possible(dev, slots + sego));
#else
BUG_ON(!netfront_tx_possible(dev, slots));
#endif /* CONFIG_NETFRONT_GSO */
#ifdef CONFIG_NETFRONT_WAITFORTX
local_irq_save(flags);
#endif /* CONFIG_NETFRONT_WAITFORTX */
#ifdef CONFIG_NETFRONT_GSO
if (unlikely(!netfront_tx_available(dev, slots + sego))) {
#else
if (unlikely(!netfront_tx_available(dev, slots))) {
#endif /* CONFIG_NETFRONT_GSO */
netfront_xmit_push(dev);
#ifdef CONFIG_NETFRONT_WAITFORTX
try_again:
#ifdef CONFIG_NETFRONT_GSO
if (!netfront_tx_available(dev, slots + sego)) {
#else
if (!netfront_tx_available(dev, slots)) {
#endif /* CONFIG_NETFRONT_GSO */
#ifndef CONFIG_NETFRONT_WAITFORTX_BUSYLOOP
add_waiter(w, netfront_txqueue); /* release thread until space is free'd */
local_irq_restore(flags);
schedule();
local_irq_save(flags);
#endif /* !CONFIG_NETFRONT_WAITFORTX_BUSYLOOP */
netfront_tx_buf_gc(dev);
goto try_again;
}
remove_waiter(w, netfront_txqueue); /* release thread until space is free'd */
#else
return ERR_MEM;
#endif /* CONFIG_NETFRONT_WAITFORTX */
}
#ifdef CONFIG_NETFRONT_WAITFORTX
local_irq_restore(flags);
#endif /* CONFIG_NETFRONT_WAITFORTX */
/* Set extras if packet is GSO kind */
first_tx = netfront_get_page(dev);
ASSERT(first_tx != NULL);
#if defined CONFIG_NETFRONT_GSO && TCP_GSO
if (sego) {
gso = (struct netif_extra_info *) RING_GET_REQUEST(&dev->tx, dev->tx.req_prod_pvt++);
first_tx->flags |= NETTXF_extra_info;
gso->u.gso.size = p->gso_size; /* segmentation size */
gso->u.gso.type = co_type; /* XEN_NETIF_GSO_TYPE_TCPV4, XEN_NETIF_GSO_TYPE_TCPV6 */
gso->u.gso.pad = 0;
gso->u.gso.features = 0;
gso->type = XEN_NETIF_EXTRA_TYPE_GSO;
gso->flags = 0;
used++;
}
#endif /* CONFIG_NETFRONT_GSO */
/* Make TX requests for the pbuf */
#ifdef CONFIG_NETFRONT_PERSISTENT_GRANTS
netfront_make_txreqs_pgnt(dev, first_tx, p, &used);
#else
netfront_make_txreqs(dev, first_tx, p, &used);
#endif
ASSERT(slots >= used); /* we should have taken at most the number slots that we estimated before */
ASSERT(slots <= XEN_NETIF_NR_SLOTS_MIN); /* we should never take more slots than the backend supports */
/* partially checksummed (offload enabled), or checksummed */
first_tx->flags |= co_type ? ((NETTXF_csum_blank) | (NETTXF_data_validated)) : (NETTXF_data_validated);
push |= (((dev)->tx.req_prod_pvt - (dev)->tx.rsp_cons) <= NET_TX_RING_SIZE / 2);
if (push)
netfront_xmit_push(dev);
#ifdef CONFIG_NETFRONT_STATS
++dev->txpkts;
dev->txbytes += p->tot_len;
#endif
dprintk("tx: %c%c%c %u bytes (%u slots)\n", sego ? 'S' : '-', co_type ? 'C' : '-', push ? 'P' : '-', p->tot_len, slots);
return ERR_OK;
}
void netfront_xmit_push(struct netfront_dev *dev)
{
int flags;
netfront_xmit_notify(dev);
/* Collects any outstanding responses for more requests */
local_irq_save(flags);
netfront_tx_buf_gc(dev);
local_irq_restore(flags);
}
void netfront_set_rx_pbuf_handler(struct netfront_dev *dev,
void (*thenetif_rx)(struct pbuf *p, void *arg),
void *arg)
{
if (dev->netif_rx_pbuf && dev->netif_rx_pbuf != netif_rx_pbuf)
printk("Replacing netif_rx_pbuf handler for dev %s\n", dev->nodename);
dev->netif_rx = NULL;
dev->netif_rx_pbuf = thenetif_rx;
dev->netif_rx_arg = arg;
}
#endif
static void free_netfront(struct netfront_dev *dev)
{
int i;
int separate_tx_rx_irq = (dev->tx_evtchn != dev->rx_evtchn);
free(dev->mac);
free(dev->backend);
#ifdef CONFIG_NETMAP
if (dev->netmap)
return;
#endif
for(i=0; i<NET_TX_RING_SIZE; i++)
down(&dev->tx_sem);
mask_evtchn(dev->tx_evtchn);
if (separate_tx_rx_irq)
mask_evtchn(dev->rx_evtchn);
gnttab_end_access(dev->rx_ring_ref);
gnttab_end_access(dev->tx_ring_ref);
free_page(dev->rx.sring);
free_page(dev->tx.sring);
unbind_evtchn(dev->tx_evtchn);
if (separate_tx_rx_irq)
unbind_evtchn(dev->rx_evtchn);
#ifdef CONFIG_NETFRONT_PERSISTENT_GRANTS
for(i=0; i<NET_RX_RING_SIZE; i++) {
if (dev->rx_buffers[i].page) {
gnttab_end_access(dev->rx_buffers[i].gref);
free_page(dev->rx_buffers[i].page);
}
}
#else
for(i=0; i<NET_RX_BUFFERS; i++) {
if (dev->rx_buffer_pool[i].page) {
if (dev->rx_buffer_pool[i].gref != GRANT_INVALID_REF)
gnttab_end_access(dev->rx_buffer_pool[i].gref);
free_page(dev->rx_buffer_pool[i].page);
}
}
#endif
#if defined CONFIG_NETFRONT_PERSISTENT_GRANTS || !defined CONFIG_NETFRONT_LWIP_ONLY
for(i=0; i<NET_TX_RING_SIZE; i++) {
if (dev->tx_buffers[i].page) {
#ifndef CONFIG_NETFRONT_PERSISTENT_GRANTS
if (dev->tx_buffers[i].gref != GRANT_INVALID_REF)
#endif
gnttab_end_access(dev->tx_buffers[i].gref);
free_page(dev->tx_buffers[i].page);
}
}
#endif
}
void shutdown_tpmfront(struct tpmfront_dev* dev)
{
char* err;
char path[512];
if(dev == NULL) {
return;
}
TPMFRONT_LOG("Shutting down tpmfront\n");
/* disconnect */
if(dev->state == XenbusStateConnected) {
/* Tell backend we are closing */
dev->state = XenbusStateClosing;
if((err = xenbus_printf(XBT_NIL, dev->nodename, "state", "%u", (unsigned int) dev->state))) {
TPMFRONT_ERR("Unable to write to %s, error was %s", dev->nodename, err);
free(err);
}
/* Clean up xenstore entries */
snprintf(path, 512, "%s/event-channel", dev->nodename);
if((err = xenbus_rm(XBT_NIL, path))) {
free(err);
}
snprintf(path, 512, "%s/ring-ref", dev->nodename);
if((err = xenbus_rm(XBT_NIL, path))) {
free(err);
}
/* Tell backend we are closed */
dev->state = XenbusStateClosed;
if((err = xenbus_printf(XBT_NIL, dev->nodename, "state", "%u", (unsigned int) dev->state))) {
TPMFRONT_ERR("Unable to write to %s, error was %s", dev->nodename, err);
free(err);
}
/* Wait for the backend to close and unmap shared pages, ignore any errors */
wait_for_backend_state_changed(dev, XenbusStateClosed);
/* Prepare for a later reopen (possibly by a kexec'd kernel) */
dev->state = XenbusStateInitialising;
if((err = xenbus_printf(XBT_NIL, dev->nodename, "state", "%u", (unsigned int) dev->state))) {
TPMFRONT_ERR("Unable to write to %s, error was %s", dev->nodename, err);
free(err);
}
/* Close event channel and unmap shared page */
mask_evtchn(dev->evtchn);
unbind_evtchn(dev->evtchn);
gnttab_end_access(dev->ring_ref);
free_page(dev->page);
}
/* Cleanup memory usage */
if(dev->respbuf) {
free(dev->respbuf);
}
if(dev->bepath) {
free(dev->bepath);
}
if(dev->nodename) {
free(dev->nodename);
}
free(dev);
}
