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【OLK-5.10同步】【上游smc补丁回合】 smc中dma操作相关的优化
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giree2
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2023-05-23 11:12
<!-- #请根据issue的类型在标题左侧下拉框中选择对应的选项（需求、缺陷或CVE等）--> <!-- #请根据issue相关的版本在里程碑中选择对应的节点，若是与版本无关，请选择“不关联里程碑”--> |commit | title | 说明 | |---|---|---| | 6d52e2de6415 | net/smc: remove redundant dma sync ops | smc_sndbufs是发送缓存区，CPU将数据写入，PCIE设备从中读取数据；因为PCIE设备不会写入缓冲区，所以需要smc_ib_sync_sg_for_device，而smc_ib_sync_sg_for_cpu是多余的。smc_rmbs是接收缓冲区，PCIE设备将数据写入，CPU从中读取数据。因为CPU不会写入缓冲区，所以需smc_ib_sync_sg_for_cpu，而smc_ib_sync_sg_for_device是多余的。 | |0ef69e788411| net/smc: optimize for smc_sndbuf_sync_sg_for_device and smc_rmb_sync_sg_for_cpu | 一些CPU可以保证DMA缓存一致性，比如Xeon。因此，在这些CPU上不需要使用dma sync API来刷新缓存。为了避免在IO路径上调用dma sync API，在创建smc_buf_desc时使用dma_need_sync来检查是否需要对smc_buf_desc进行dma sync。 |
<!-- #请根据issue的类型在标题左侧下拉框中选择对应的选项（需求、缺陷或CVE等）--> <!-- #请根据issue相关的版本在里程碑中选择对应的节点，若是与版本无关，请选择“不关联里程碑”--> |commit | title | 说明 | |---|---|---| | 6d52e2de6415 | net/smc: remove redundant dma sync ops | smc_sndbufs是发送缓存区，CPU将数据写入，PCIE设备从中读取数据；因为PCIE设备不会写入缓冲区，所以需要smc_ib_sync_sg_for_device，而smc_ib_sync_sg_for_cpu是多余的。smc_rmbs是接收缓冲区，PCIE设备将数据写入，CPU从中读取数据。因为CPU不会写入缓冲区，所以需smc_ib_sync_sg_for_cpu，而smc_ib_sync_sg_for_device是多余的。 | |0ef69e788411| net/smc: optimize for smc_sndbuf_sync_sg_for_device and smc_rmb_sync_sg_for_cpu | 一些CPU可以保证DMA缓存一致性，比如Xeon。因此，在这些CPU上不需要使用dma sync API来刷新缓存。为了避免在IO路径上调用dma sync API，在创建smc_buf_desc时使用dma_need_sync来检查是否需要对smc_buf_desc进行dma sync。 |
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