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[RFC,v1,3/7] net/ena: relax the rmb for DMA

Message ID 20200313091835.58039-4-gavin.hu@arm.com (mailing list archive)
State RFC, archived
Delegated to: Ferruh Yigit
Headers
Series relax barriers for ENA PMD and small fixes |

Checks

Context Check Description
ci/checkpatch success coding style OK
ci/Intel-compilation fail Compilation issues

Commit Message

Gavin Hu March 13, 2020, 9:18 a.m. UTC 
  The user space DPDK rte_cio_rmb barrier in definition corresponds to the
kernel dma_rmb barrier on all supported architectures[1][2][3].

As it is called in the data path[4], redefine it to relax the barrier and
uplift the performance.

[1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/
linux.git/tree/arch/x86/include/asm/barrier.h?h=v5.5#n54
[2] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/
linux.git/tree/arch/powerpc/include/asm/barrier.h?h=v5.5#n46
[3] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/
linux.git/tree/arch/arm64/include/asm/barrier.h?h=v5.5#n48
[4] http://code.dpdk.org/dpdk/v20.02/source/drivers/net/ena/
ena_ethdev.c#L2021

Fixes: b68309be44c0 ("net/ena/base: update communication layer for the ENAv2")
Cc: stable@dpdk.org

Signed-off-by: Gavin Hu <gavin.hu@arm.com>
Reviewed-by: Honnappa Nagarahalli <honnappa.nagarahalli@arm.com>
---
 drivers/net/ena/base/ena_plat_dpdk.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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Patch

diff --git a/drivers/net/ena/base/ena_plat_dpdk.h b/drivers/net/ena/base/ena_plat_dpdk.h
index b611fb204..60327a726 100644
--- a/drivers/net/ena/base/ena_plat_dpdk.h
+++ b/drivers/net/ena/base/ena_plat_dpdk.h
@@ -254,7 +254,7 @@  extern uint32_t ena_alloc_cnt;
 #define msleep(x) rte_delay_us(x * 1000)
 #define udelay(x) rte_delay_us(x)
 
-#define dma_rmb() rmb()
+#define dma_rmb() rte_cio_rmb()
 
 #define MAX_ERRNO       4095
 #define IS_ERR(x) (((unsigned long)x) >= (unsigned long)-MAX_ERRNO)