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net/smc: optimize for smc_sndbuf_sync_sg_for_device and smc_rmb_sync_sg_for_cpu
authorGuangguan Wang <guangguan.wang@linux.alibaba.com>
Thu, 14 Jul 2022 09:44:01 +0000 (17:44 +0800)
committerDavid S. Miller <davem@davemloft.net>
Mon, 18 Jul 2022 10:19:17 +0000 (11:19 +0100)
commit0ef69e788411cba2af017db731a9fc62d255e9ac
tree4eef442d258216d382747071b839592992519931tree | snapshot
parent6d52e2de6415b7a035b3e8dc4ccffd0da25bbfb9commit | diff
net/smc: optimize for smc_sndbuf_sync_sg_for_device and smc_rmb_sync_sg_for_cpu

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>
net/smc/smc_core.c diff | blob | history
net/smc/smc_core.h diff | blob | history
net/smc/smc_ib.c diff | blob | history
net/smc/smc_ib.h diff | blob | history
Domain: System / Kernel;