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NTB bug and documentation fixes, new device IDs, performance

Browse source 
improvements, and adding a mailing list to MAINTAINERS for NTB.
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Merge tag 'ntb-4.3' of git://github.com/jonmason/ntb

Pull NTB fixes from Jon Mason:
 "NTB bug and documentation fixes, new device IDs, performance
  improvements, and adding a mailing list to MAINTAINERS for NTB"

* tag 'ntb-4.3' of git://github.com/jonmason/ntb:
  NTB: Fix range check on memory window index
  NTB: Improve index handling in B2B MW workaround
  NTB: Fix documentation for ntb_peer_db_clear.
  NTB: Fix documentation for ntb_link_is_up
  NTB: Use unique DMA channels for TX and RX
  NTB: Remove dma_sync_wait from ntb_async_rx
  NTB: Clean up QP stats info
  NTB: Make the transport list in order of discovery
  NTB: Add PCI Device IDs for Broadwell Xeon
  NTB: Add flow control to the ntb_netdev
  NTB: Add list to MAINTAINERS
This commit is contained in:
Linus Torvalds 2015-09-11 19:29:00 -07:00
commit ded0e250b5
7 changed files with 210 additions and 47 deletions
Download patch file Download diff file Expand all files Collapse all files

77
drivers/net/ntb_netdev.c
View file

@ -61,11 +61,21 @@ MODULE_VERSION(NTB_NETDEV_VER);
MODULE_LICENSE("Dual BSD/GPL");
MODULE_AUTHOR("Intel Corporation");
/* Time in usecs for tx resource reaper */
static unsigned int tx_time = 1;
/* Number of descriptors to free before resuming tx */
static unsigned int tx_start = 10;
/* Number of descriptors still available before stop upper layer tx */
static unsigned int tx_stop = 5;
struct ntb_netdev {
struct list_head list;
struct pci_dev *pdev;
struct net_device *ndev;
struct ntb_transport_qp *qp;
struct timer_list tx_timer;
};
#define NTB_TX_TIMEOUT_MS 1000
@ -136,11 +146,42 @@ enqueue_again:
}
}
static int __ntb_netdev_maybe_stop_tx(struct net_device *netdev,
struct ntb_transport_qp *qp, int size)
{
struct ntb_netdev *dev = netdev_priv(netdev);
netif_stop_queue(netdev);
/* Make sure to see the latest value of ntb_transport_tx_free_entry()
* since the queue was last started.
*/
smp_mb();
if (likely(ntb_transport_tx_free_entry(qp) < size)) {
mod_timer(&dev->tx_timer, jiffies + usecs_to_jiffies(tx_time));
return -EBUSY;
}
netif_start_queue(netdev);
return 0;
}
static int ntb_netdev_maybe_stop_tx(struct net_device *ndev,
struct ntb_transport_qp *qp, int size)
{
if (netif_queue_stopped(ndev) ||
(ntb_transport_tx_free_entry(qp) >= size))
return 0;
return __ntb_netdev_maybe_stop_tx(ndev, qp, size);
}
static void ntb_netdev_tx_handler(struct ntb_transport_qp *qp, void *qp_data,
void *data, int len)
{
struct net_device *ndev = qp_data;
struct sk_buff *skb;
struct ntb_netdev *dev = netdev_priv(ndev);
skb = data;
if (!skb || !ndev)
@ -155,6 +196,15 @@ static void ntb_netdev_tx_handler(struct ntb_transport_qp *qp, void *qp_data,
}
dev_kfree_skb(skb);
if (ntb_transport_tx_free_entry(dev->qp) >= tx_start) {
/* Make sure anybody stopping the queue after this sees the new
* value of ntb_transport_tx_free_entry()
*/
smp_mb();
if (netif_queue_stopped(ndev))
netif_wake_queue(ndev);
}
}
static netdev_tx_t ntb_netdev_start_xmit(struct sk_buff *skb,
@ -163,10 +213,15 @@ static netdev_tx_t ntb_netdev_start_xmit(struct sk_buff *skb,
struct ntb_netdev *dev = netdev_priv(ndev);
int rc;
ntb_netdev_maybe_stop_tx(ndev, dev->qp, tx_stop);
rc = ntb_transport_tx_enqueue(dev->qp, skb, skb->data, skb->len);
if (rc)
goto err;
/* check for next submit */
ntb_netdev_maybe_stop_tx(ndev, dev->qp, tx_stop);
return NETDEV_TX_OK;
err:
@ -175,6 +230,23 @@ err:
return NETDEV_TX_BUSY;
}
static void ntb_netdev_tx_timer(unsigned long data)
{
struct net_device *ndev = (struct net_device *)data;
struct ntb_netdev *dev = netdev_priv(ndev);
if (ntb_transport_tx_free_entry(dev->qp) < tx_stop) {
mod_timer(&dev->tx_timer, jiffies + msecs_to_jiffies(tx_time));
} else {
/* Make sure anybody stopping the queue after this sees the new
* value of ntb_transport_tx_free_entry()
*/
smp_mb();
if (netif_queue_stopped(ndev))
netif_wake_queue(ndev);
}
}
static int ntb_netdev_open(struct net_device *ndev)
{
struct ntb_netdev *dev = netdev_priv(ndev);
@ -197,8 +269,11 @@ static int ntb_netdev_open(struct net_device *ndev)
}
}
setup_timer(&dev->tx_timer, ntb_netdev_tx_timer, (unsigned long)ndev);
netif_carrier_off(ndev);
ntb_transport_link_up(dev->qp);
netif_start_queue(ndev);
return 0;
@ -219,6 +294,8 @@ static int ntb_netdev_close(struct net_device *ndev)
while ((skb = ntb_transport_rx_remove(dev->qp, &len)))
dev_kfree_skb(skb);
del_timer_sync(&dev->tx_timer);
return 0;
}