diff mbox series

[v2,6/7] net/qede: prefetch next packet to free

Message ID 0451d740c7207319f7aa09d9f73adefdee9efd4c.1616754844.git.bnemeth@redhat.com (mailing list archive)
State Accepted
Delegated to: Jerin Jacob
Headers show
Series Optimize qede use of Rx/Tx entries | expand


Context Check Description
ci/checkpatch success coding style OK

Commit Message

Balazs Nemeth March 26, 2021, 11:01 a.m. UTC
While handling the current mbuf, pull the next mbuf into the cache. Note
that the last four mbufs pulled into the cache are not handled, but that
doesn't matter.

Signed-off-by: Balazs Nemeth <bnemeth@redhat.com>
Reviewed-by: Igor Russkikh <irusskikh@marvell.com>
 drivers/net/qede/qede_rxtx.c | 6 ++++++
 1 file changed, 6 insertions(+)
diff mbox series


diff --git a/drivers/net/qede/qede_rxtx.c b/drivers/net/qede/qede_rxtx.c
index 4f58abfbf..ed3617160 100644
--- a/drivers/net/qede/qede_rxtx.c
+++ b/drivers/net/qede/qede_rxtx.c
@@ -917,6 +917,12 @@  qede_process_tx_compl(__rte_unused struct ecore_dev *edev,
 		nb_segs = mbuf->nb_segs;
 		remaining -= nb_segs;
+		/* Prefetch the next mbuf. Note that at least the last 4 mbufs
+		 * that are prefetched will not be used in the current call.
+		 */
+		rte_mbuf_prefetch_part1(txq->sw_tx_ring[(idx + 4) & mask]);
+		rte_mbuf_prefetch_part2(txq->sw_tx_ring[(idx + 4) & mask]);
 		PMD_TX_LOG(DEBUG, txq, "nb_segs to free %u\n", nb_segs);
 		while (nb_segs) {