From f1e250bf365962519c96a1255b2fe34b6c0d6c60 Mon Sep 17 00:00:00 2001 From: Ioana Ciocoi Radulescu Date: Fri, 14 Dec 2018 16:04:05 +0000 Subject: [PATCH] soc: fsl: dpio: Add prefetch instruction In dpaa2_io_store_next(), if the current dequeue entry is not the last, prefetch the next one as most likely it will be requested shortly by the consumer driver. This brings a ~3% improvement for dpaa2 ethernet driver IP forwarding with small size frames. Signed-off-by: Ioana Radulescu Signed-off-by: Li Yang --- drivers/soc/fsl/dpio/dpio-service.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/soc/fsl/dpio/dpio-service.c b/drivers/soc/fsl/dpio/dpio-service.c index bc801934602a..5389336463c0 100644 --- a/drivers/soc/fsl/dpio/dpio-service.c +++ b/drivers/soc/fsl/dpio/dpio-service.c @@ -630,6 +630,7 @@ struct dpaa2_dq *dpaa2_io_store_next(struct dpaa2_io_store *s, int *is_last) if (!(dpaa2_dq_flags(ret) & DPAA2_DQ_STAT_VALIDFRAME)) ret = NULL; } else { + prefetch(&s->vaddr[s->idx]); *is_last = 0; }