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authorStephen Hemminger <shemminger@vyatta.com>2009-08-27 13:55:11 +0000
committerDavid S. Miller <davem@davemloft.net>2009-08-28 23:31:55 -0700
commit3791decb5aa0202d2a2473d6cf4947d98e846c7a (patch)
tree43fa8ce25c787bf31b9d37545f6f840bbc8f1670 /net/core
parent3bda06a3d7987bfeabb218ac2f17ce22c34f13b3 (diff)
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pktgen: xmit logic reorganization
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>
Diffstat (limited to 'net/core')
-rw-r--r--net/core/pktgen.c55
1 files changed, 24 insertions, 31 deletions
diff --git a/net/core/pktgen.c b/net/core/pktgen.c
index 1b1f126..89fd232 100644
--- a/net/core/pktgen.c
+++ b/net/core/pktgen.c
@@ -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 */