Exemplo n.º 1
0
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);
}
Exemplo n.º 2
0
/**
 * 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);
}