static inline int sn_send_tx_queue(struct sn_queue *queue,
struct sn_device* dev, struct sk_buff* skb)
{
struct sn_tx_metadata tx_meta;
int ret = NET_XMIT_DROP;
#if LINUX_VERSION_CODE < KERNEL_VERSION(3,10,0)
if (queue->tx.opts.tci) {
skb = vlan_insert_tag(skb, queue->tx.opts.tci);
if (unlikely(!skb))
goto skip_send;
}
#else
if (queue->tx.opts.tci) {
skb = vlan_insert_tag(skb, htons(ETH_P_8021Q),
queue->tx.opts.tci);
if (unlikely(!skb))
goto skip_send;
}
if (queue->tx.opts.outer_tci) {
skb = vlan_insert_tag(skb, htons(ETH_P_8021AD),
queue->tx.opts.outer_tci);
if (unlikely(!skb))
goto skip_send;
}
#endif
skb_orphan(skb);
sn_set_tx_metadata(skb, &tx_meta);
ret = dev->ops->do_tx(queue, skb, &tx_meta);
skip_send:
switch (ret) {
case NET_XMIT_CN:
queue->tx.stats.throttled++;
/* fall through */
case NET_XMIT_SUCCESS:
queue->tx.stats.packets++;
queue->tx.stats.bytes += skb->len;
break;
case NET_XMIT_DROP:
queue->tx.stats.dropped++;
break;
case SN_NET_XMIT_BUFFERED:
/* should not free skb */
return NET_XMIT_SUCCESS;
}
dev_kfree_skb(skb);
return ret;
}
/* As a soft device without qdisc,
* this function returns NET_XMIT_* instead of NETDEV_TX_* */
static int sn_start_xmit(struct sk_buff *skb, struct net_device *netdev)
{
struct sn_device *dev = netdev_priv(netdev);
struct sn_queue *queue;
struct sn_tx_metadata tx_meta;
int ret;
u16 txq = skb->queue_mapping;
/* log_info("txq=%d cpu=%d\n", txq, raw_smp_processor_id()); */
if (unlikely(skb->len > MAX_LFRAME)) {
log_err("too large skb! (%d)\n", skb->len);
dev_kfree_skb(skb);
return NET_XMIT_DROP;
}
if (unlikely(skb_shinfo(skb)->frag_list)) {
log_err("frag_list is not NULL!\n");
dev_kfree_skb(skb);
return NET_XMIT_DROP;
}
if (unlikely(txq >= dev->num_txq)) {
log_err("invalid txq=%u\n", txq);
dev_kfree_skb(skb);
return NET_XMIT_DROP;
}
queue = dev->tx_queues[txq];
sn_set_tx_metadata(skb, &tx_meta);
ret = dev->ops->do_tx(queue, skb, &tx_meta);
if (unlikely(ret == NET_XMIT_DROP)) {
queue->tx_stats.dropped++;
} else {
queue->tx_stats.packets++;
queue->tx_stats.bytes += skb->len;
if (unlikely(ret == NET_XMIT_CN))
queue->tx_stats.throttled++;
}
dev_kfree_skb(skb);
return ret;
}
