net/smc: optimize for smc_sndbuf_sync_sg_for_device and smc_rmb_sync_sg_for_cpu

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Some CPU, such as Xeon, can guarantee DMA cache coherency.
So it is no need to use dma sync APIs to flush cache on such CPUs.
In order to avoid calling dma sync APIs on the IO path, use the
dma_need_sync to check whether smc_buf_desc needs dma sync when
creating smc_buf_desc.

Signed-off-by: Guangguan Wang <guangguan.wang@linux.alibaba.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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Guangguan Wang 2022-07-14 17:44:01 +08:00 • committed by David S. Miller

parent 6d52e2de64

commit 0ef69e7884

4 changed files with 40 additions and 0 deletions

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8

net/smc/smc_core.c

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net/smc/smc_core.h

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29

net/smc/smc_ib.c

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net/smc/smc_ib.h

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