void netfront_xmit(struct netfront_dev *dev, unsigned char* data,int len)
{
int flags;
struct netif_tx_request *tx;
RING_IDX i;
int notify;
unsigned short id;
struct net_buffer* buf;
void* page;
#ifdef CONFIG_NETMAP
if (dev->netmap) {
netmap_netfront_xmit(dev->na, data, len);
return;
}
#endif
BUG_ON(len > PAGE_SIZE);
down(&dev->tx_sem);
local_irq_save(flags);
id = get_id_from_freelist(dev->tx_freelist);
local_irq_restore(flags);
buf = &dev->tx_buffers[id];
page = buf->page;
i = dev->tx.req_prod_pvt;
tx = RING_GET_REQUEST(&dev->tx, i);
memcpy(page,data,len);
tx->gref = buf->gref;
tx->offset=0;
tx->size = len;
tx->flags=0;
tx->id = id;
dev->tx.req_prod_pvt = i + 1;
wmb();
RING_PUSH_REQUESTS_AND_CHECK_NOTIFY(&dev->tx, notify);
if(notify) notify_remote_via_evtchn(dev->evtchn);
local_irq_save(flags);
network_tx_buf_gc(dev);
local_irq_restore(flags);
}
/**
* Transmit function for raw buffers (non-GSO/TCO)
*/
void netfront_xmit(struct netfront_dev *dev, unsigned char *data, int len)
{
int flags;
struct netif_tx_request *tx;
struct net_txbuffer* buf;
void* page;
#ifdef CONFIG_NETMAP
if (dev->netmap) {
netmap_netfront_xmit(dev->na, data, len);
return;
}
#endif
BUG_ON(len > PAGE_SIZE);
if (!netfront_tx_available(dev, 1))
goto out;
tx = netfront_get_page(dev);
ASSERT(tx != NULL);
buf = &dev->tx_buffers[tx->id];
page = buf->page;
#ifndef CONFIG_NETFRONT_PERSISTENT_GRANTS
tx->gref = buf->gref = gnttab_grant_access(dev->dom,
virt_to_mfn(page), 0);
BUG_ON(tx->gref == GRANT_INVALID_REF);
#endif
NETIF_MEMCPY(page, data, len);
tx->flags |= (NETTXF_data_validated);
tx->size = len;
#ifdef CONFIG_NETFRONT_STATS
++dev->txpkts;
dev->txbytes += len;
#endif
netfront_xmit_notify(dev);
dprintk("tx: raw %d\n", len);
out:
local_irq_save(flags);
netfront_tx_buf_gc(dev);
local_irq_restore(flags);
}