libhns: Support flexible WQE buffer page size #1453
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To commit: ?? ("RDMA/hns: Support flexible WQE buffer page size").
Signed-off-by: Junxian Huang <[email protected]>
Currently, driver fixedly allocates 4K pages for userspace WQE buffer and results in HW reading WQE with a granularity of 4K even in a 64K system. HW has to switch pages every 4K, leading to a loss of performance. In order to improve performance, add support for userspace to allocate flexible WQE buffer page size between 4K to system PAGESIZE. During ibv_create_qp(), the userspace driver will dynamically select the appropriate page size based on ibv_qp_cap, thus improving performance without consuming too much memory. For old-version userspace driver that does not support this feature, the kernel driver will use a fixed 4K pagesize. Signed-off-by: Chengchang Tang <[email protected]> Signed-off-by: Junxian Huang <[email protected]>
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Currently, driver fixedly allocates 4K pages for userspace WQE buffer
and results in HW reading WQE with a granularity of 4K even in a 64K
system. HW has to switch pages every 4K, leading to a loss of performance.
In order to improve performance, add support for userspace to allocate
flexible WQE buffer page size between 4K to system PAGESIZE. During
ibv_create_qp(), the userspace driver will dynamically select the
appropriate page size based on ibv_qp_cap, thus improving performance
without consuming too much memory.
For old-version userspace driver that does not support this feature,
the kernel driver will use a fixed 4K pagesize.