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dpif-netdev: drop swapping

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emc_processing() moves all the missed packets towards the beginning of
packet array; matched packets are queued up into flow queues. Since the
remaining of the packet array is not used anymore, don't bother swap
packet pointers to save cycles and simplify logic.

Signed-off-by: Andy Zhou <azhou@ovn.org>
Acked-by: Daniele Di Proietto <diproiettod@vmware.com>
This commit is contained in:
Andy Zhou
2016-01-25 18:48:19 -08:00
parent 3d88a620f1
commit d1aa0b94d8
1 changed files with 3 additions and 12 deletions
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15
lib/dpif-netdev.c
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@@ -3285,14 +3285,6 @@ dp_netdev_queue_batches(struct dp_packet *pkt,
packet_batch_update(batch, pkt, mf);
}
static inline void
dp_packet_swap(struct dp_packet **a, struct dp_packet **b)
{
struct dp_packet *tmp = *a;
*a = *b;
*b = tmp;
}
/* Try to process all ('cnt') the 'packets' using only the exact match cache
* 'flow_cache'. If a flow is not found for a packet 'packets[i]', the
* miniflow is copied into 'keys' and the packet pointer is moved at the
@@ -3333,10 +3325,9 @@ emc_processing(struct dp_netdev_pmd_thread *pmd, struct dp_packet **packets,
dp_netdev_queue_batches(packets[i], flow, &key.mf, batches,
n_batches);
} else {
if (i != n_missed) {
dp_packet_swap(&packets[i], &packets[n_missed]);
}
/* Exact match cache missed. Group missed packets together at
* the beginning of the 'packets' array. */
packets[n_missed] = packets[i];
keys[n_missed++] = key;
}
}