static netdev_tx_t
kni_loopback_xmit(struct sk_buff *skb,
struct net_device *dev)
{
skb_orphan(skb);
if (skb->vlan_tci == 1){
//Need to be sent to the fastpath
kni_net_tx(skb, dev);
}else{
/* it's OK to use per_cpu_ptr() because BHs are off */
netif_rx(skb);
}
return NETDEV_TX_OK;
}
/*
* RX: loopback with enqueue/dequeue fifos and sk buffer copies.
*/
static void
kni_net_rx_lo_fifo_skb(struct kni_dev *kni)
{
unsigned ret;
uint32_t len;
unsigned i, num_rq, num_fq, num;
struct rte_kni_mbuf *kva;
struct rte_kni_mbuf *va[MBUF_BURST_SZ];
void * data_kva;
struct sk_buff *skb;
struct net_device *dev = kni->net_dev;
/* Get the number of entries in rx_q */
num_rq = kni_fifo_count(kni->rx_q);
/* Get the number of free entries in free_q */
num_fq = kni_fifo_free_count(kni->free_q);
/* Calculate the number of entries to dequeue from rx_q */
num = min(num_rq, num_fq);
num = min(num, (unsigned)MBUF_BURST_SZ);
/* Return if no entry to dequeue from rx_q */
if (num == 0)
return;
/* Burst dequeue mbufs from rx_q */
ret = kni_fifo_get(kni->rx_q, (void **)va, num);
if (ret == 0)
return;
/* Copy mbufs to sk buffer and then call tx interface */
for (i = 0; i < num; i++) {
kva = (void *)va[i] - kni->mbuf_va + kni->mbuf_kva;
len = kva->data_len;
data_kva = kva->buf_addr + kva->data_off - kni->mbuf_va +
kni->mbuf_kva;
skb = dev_alloc_skb(len + 2);
if (skb == NULL)
KNI_ERR("Out of mem, dropping pkts\n");
else {
/* Align IP on 16B boundary */
skb_reserve(skb, 2);
memcpy(skb_put(skb, len), data_kva, len);
skb->dev = dev;
skb->ip_summed = CHECKSUM_UNNECESSARY;
dev_kfree_skb(skb);
}
/* Simulate real usage, allocate/copy skb twice */
skb = dev_alloc_skb(len + 2);
if (skb == NULL) {
KNI_ERR("Out of mem, dropping pkts\n");
kni->stats.rx_dropped++;
}
else {
/* Align IP on 16B boundary */
skb_reserve(skb, 2);
memcpy(skb_put(skb, len), data_kva, len);
skb->dev = dev;
skb->ip_summed = CHECKSUM_UNNECESSARY;
kni->stats.rx_bytes += len;
kni->stats.rx_packets++;
/* call tx interface */
kni_net_tx(skb, dev);
}
}
/* enqueue all the mbufs from rx_q into free_q */
ret = kni_fifo_put(kni->free_q, (void **)&va, num);
if (ret != num)
/* Failing should not happen */
KNI_ERR("Fail to enqueue mbufs into free_q\n");
}
