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[for-next,0/2] RDMA/erdma: Add non-4K page size support

Message ID 20230220102015.43047-1-chengyou@linux.alibaba.com (mailing list archive)
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Series RDMA/erdma: Add non-4K page size support | expand

Message

Cheng Xu Feb. 20, 2023, 10:20 a.m. UTC 
Hi,

This series introduces non-4K page size support. For some aarch64
distributions, the default page size is 64K, not 4K. Current erdma can
not work correctly for these systems. There are two reasons: one is that
the kernel driver passes the kernel's page size to HW, but HW always
treats 4096 as the basic page size. The second reason is that the user
space provider uses 4096 to map the doorbell space which is right for
4096 page size only.

So, we fix these issues in this patchset:
- #1 fixes the issue that put wrong value in CMD to HW if PAGE_SIZE is
  not 4096.
- #2 returns the necessary information for userspace to call mmap. This
  commit requires changes in userspace provider. PR is [1].

Thanks,
Cheng Xu

[1] https://github.com/linux-rdma/rdma-core/pull/1313

Cheng Xu (2):
  RDMA/erdma: Use fixed hardware page size
  RDMA/erdma: Support larger page size with doorbell allocation

 drivers/infiniband/hw/erdma/erdma_hw.h    |  4 ++
 drivers/infiniband/hw/erdma/erdma_verbs.c | 57 +++++++++++------------
 drivers/infiniband/hw/erdma/erdma_verbs.h |  5 +-
 include/uapi/rdma/erdma-abi.h             |  5 +-
 4 files changed, 36 insertions(+), 35 deletions(-)