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pktgen: xmit logic reorganization

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Do some reorganization of transmit logic path:
   * move transmit queue full idle to separate routine
   * add a cpu_relax()
   * eliminate some of the uneeded goto's
   * if queue is still stopped, go back to main thread loop.
   * don't give up transmitting if quantum is exhausted (be greedy)

Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Stephen Hemminger 2009-08-27 13:55:11 +00:00 committed by David S. Miller
parent 3bda06a3d7
commit 3791decb5a
1 changed files with 24 additions and 31 deletions
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55
net/core/pktgen.c
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@ -3339,6 +3339,18 @@ static void pktgen_rem_thread(struct pktgen_thread *t)
mutex_unlock(&pktgen_thread_lock);
}
static void idle(struct pktgen_dev *pkt_dev)
{
u64 idle_start = getCurUs();
if (need_resched())
schedule();
else
cpu_relax();
pkt_dev->idle_acc += getCurUs() - idle_start;
}
static void pktgen_xmit(struct pktgen_dev *pkt_dev)
{
struct net_device *odev = pkt_dev->odev;
@ -3361,7 +3373,7 @@ static void pktgen_xmit(struct pktgen_dev *pkt_dev)
if (pkt_dev->delay_us == 0x7FFFFFFF) {
pkt_dev->next_tx_us = getCurUs() + pkt_dev->delay_us;
pkt_dev->next_tx_ns = pkt_dev->delay_ns;
goto out;
return;
}
}
@ -3373,26 +3385,14 @@ static void pktgen_xmit(struct pktgen_dev *pkt_dev)
}
txq = netdev_get_tx_queue(odev, queue_map);
if (netif_tx_queue_stopped(txq) ||
netif_tx_queue_frozen(txq) ||
need_resched()) {
u64 idle_start = getCurUs();
if (!netif_running(odev)) {
/* Did we saturate the queue already? */
if (netif_tx_queue_stopped(txq) || netif_tx_queue_frozen(txq)) {
/* If device is down, then all queues are permnantly frozen */
if (netif_running(odev))
idle(pkt_dev);
else
pktgen_stop_device(pkt_dev);
goto out;
}
if (need_resched())
schedule();
pkt_dev->idle_acc += getCurUs() - idle_start;
if (netif_tx_queue_stopped(txq) ||
netif_tx_queue_frozen(txq)) {
pkt_dev->next_tx_us = getCurUs(); /* TODO */
pkt_dev->next_tx_ns = 0;
goto out; /* Try the next interface */
}
return;
}
if (pkt_dev->last_ok || !pkt_dev->skb) {
@ -3407,7 +3407,7 @@ static void pktgen_xmit(struct pktgen_dev *pkt_dev)
"allocate skb in fill_packet.\n");
schedule();
pkt_dev->clone_count--; /* back out increment, OOM */
goto out;
return;
}
pkt_dev->allocated_skbs++;
pkt_dev->clone_count = 0; /* reset counter */
@ -3419,9 +3419,9 @@ static void pktgen_xmit(struct pktgen_dev *pkt_dev)
txq = netdev_get_tx_queue(odev, queue_map);
__netif_tx_lock_bh(txq);
if (!netif_tx_queue_stopped(txq) &&
!netif_tx_queue_frozen(txq)) {
if (unlikely(netif_tx_queue_stopped(txq) || netif_tx_queue_frozen(txq)))
pkt_dev->last_ok = 0;
else {
atomic_inc(&(pkt_dev->skb->users));
retry_now:
ret = (*xmit)(pkt_dev->skb, odev);
@ -3458,13 +3458,6 @@ static void pktgen_xmit(struct pktgen_dev *pkt_dev)
pkt_dev->next_tx_ns -= 1000;
}
}
else { /* Retry it next time */
pkt_dev->last_ok = 0;
pkt_dev->next_tx_us = getCurUs(); /* TODO */
pkt_dev->next_tx_ns = 0;
}
__netif_tx_unlock_bh(txq);
/* If pkt_dev->count is zero, then run forever */