On 05/05/2015 01:30 PM, Jesper Dangaard Brouer wrote:
<snip>
diff --git a/net/core/pktgen.c b/net/core/pktgen.c
index 43bb215..85195b2 100644
--- a/net/core/pktgen.c
+++ b/net/core/pktgen.c
@@ -210,6 +210,10 @@
<snip>
@@ -3320,6 +3358,7 @@ static void pktgen_xmit(struct pktgen_dev *pkt_dev)
unsigned int burst = ACCESS_ONCE(pkt_dev->burst);
struct net_device *odev = pkt_dev->odev;
struct netdev_queue *txq;
+ struct sk_buff *skb;
int ret;
/* If device is offline, then don't send */
@@ -3352,11 +3391,45 @@ static void pktgen_xmit(struct pktgen_dev *pkt_dev)
pkt_dev->last_pkt_size = pkt_dev->skb->len;
pkt_dev->allocated_skbs++;
pkt_dev->clone_count = 0; /* reset counter */
+ if (pkt_dev->xmit_mode == M_RX_INJECT)
+ pkt_dev->skb->protocol = eth_type_trans(pkt_dev->skb,
+
pkt_dev->skb->dev);
}
I was just wondering. Since M_RX_INJECT is not compatible with
clone_skb couldn't the lines added above be moved down into the block
below so that you could avoid the additional conditional jump?
if (pkt_dev->delay && pkt_dev->last_ok)
spin(pkt_dev, pkt_dev->next_tx);
+ if (pkt_dev->xmit_mode == M_RX_INJECT) {
+ skb = pkt_dev->skb;
+ atomic_add(burst, &skb->users);
+ local_bh_disable();
+ do {
+ ret = netif_receive_skb(skb);
+ if (ret == NET_RX_DROP)
+ pkt_dev->errors++;
+ pkt_dev->sofar++;
+ pkt_dev->seq_num++;
+ if (atomic_read(&skb->users) != burst) {
+ /* skb was queued by rps/rfs or taps,
+ * so cannot reuse this skb
+ */
+ atomic_sub(burst - 1, &skb->users);
+ /* get out of the loop and wait
+ * until skb is consumed
+ */
+ pkt_dev->last_ok = 1;
+ break;
+ }
+ /* skb was 'freed' by stack, so clean few
+ * bits and reuse it
+ */
+#ifdef CONFIG_NET_CLS_ACT
+ skb->tc_verd = 0; /* reset reclass/redir ttl */
+#endif
+ } while (--burst > 0);
+ goto out; /* Skips xmit_mode M_TX */
+ }
+
txq = skb_get_tx_queue(odev, pkt_dev->skb);
local_bh_disable();
@@ -3404,6 +3477,7 @@ xmit_more:
unlock:
HARD_TX_UNLOCK(odev, txq);
+out:
local_bh_enable();
/* If pkt_dev->count is zero, then run forever */
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