/* netif_tx_lock held, process context with BHs disabled */
static int enic_hard_start_xmit(struct sk_buff *skb, struct net_device *netdev)
{
struct enic *enic = netdev_priv(netdev);
struct vnic_wq *wq = &enic->wq[0];
unsigned long flags;
if (skb->len <= 0) {
dev_kfree_skb(skb);
return NETDEV_TX_OK;
}
/* Non-TSO sends must fit within ENIC_NON_TSO_MAX_DESC descs,
* which is very likely. In the off chance it's going to take
* more than * ENIC_NON_TSO_MAX_DESC, linearize the skb.
*/
if (skb_shinfo(skb)->gso_size == 0 &&
skb_shinfo(skb)->nr_frags + 1 > ENIC_NON_TSO_MAX_DESC &&
skb_linearize(skb)) {
dev_kfree_skb(skb);
return NETDEV_TX_OK;
}
spin_lock_irqsave(&enic->wq_lock[0], flags);
if (vnic_wq_desc_avail(wq) < skb_shinfo(skb)->nr_frags + 1) {
netif_stop_queue(netdev);
/* This is a hard error, log it */
printk(KERN_ERR PFX "%s: BUG! Tx ring full when "
"queue awake!\n", netdev->name);
spin_unlock_irqrestore(&enic->wq_lock[0], flags);
return NETDEV_TX_BUSY;
}
enic_queue_wq_skb(enic, wq, skb);
if (vnic_wq_desc_avail(wq) < MAX_SKB_FRAGS + 1)
netif_stop_queue(netdev);
netdev->trans_start = jiffies;
spin_unlock_irqrestore(&enic->wq_lock[0], flags);
return NETDEV_TX_OK;
}
static netdev_tx_t enic_hard_start_xmit(struct sk_buff *skb,
struct net_device *netdev)
{
struct enic *enic = netdev_priv(netdev);
struct vnic_wq *wq = &enic->wq[0];
unsigned long flags;
if (skb->len <= 0) {
dev_kfree_skb(skb);
return NETDEV_TX_OK;
}
if (skb_shinfo(skb)->gso_size == 0 &&
skb_shinfo(skb)->nr_frags + 1 > ENIC_NON_TSO_MAX_DESC &&
skb_linearize(skb)) {
dev_kfree_skb(skb);
return NETDEV_TX_OK;
}
spin_lock_irqsave(&enic->wq_lock[0], flags);
if (vnic_wq_desc_avail(wq) <
skb_shinfo(skb)->nr_frags + ENIC_DESC_MAX_SPLITS) {
netif_stop_queue(netdev);
printk(KERN_ERR PFX "%s: BUG! Tx ring full when "
"queue awake!\n", netdev->name);
spin_unlock_irqrestore(&enic->wq_lock[0], flags);
return NETDEV_TX_BUSY;
}
enic_queue_wq_skb(enic, wq, skb);
if (vnic_wq_desc_avail(wq) < MAX_SKB_FRAGS + ENIC_DESC_MAX_SPLITS)
netif_stop_queue(netdev);
spin_unlock_irqrestore(&enic->wq_lock[0], flags);
return NETDEV_TX_OK;
}