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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 <ruxandra.radulescu@nxp.com>
Signed-off-by: Li Yang <leoyang.li@nxp.com>
This commit is contained in:
Ioana Ciocoi Radulescu 2018-12-14 16:04:05 +00:00 committed by Li Yang
parent afb7742281
commit f1e250bf36
1 changed files with 1 additions and 0 deletions
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1
drivers/soc/fsl/dpio/dpio-service.c
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@ -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;
}