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| author | Sagi Grimberg <[email protected]> | 2016-03-31 16:03:25 +0000 |
|---|---|---|
| committer | Doug Ledford <[email protected]> | 2016-04-28 14:49:17 +0000 |
| commit | 986ef95ecdd3eb6fa29433e68faa94c7624083be (patch) | |
| tree | 1b0d6700daf564a1507f8c3226678cf7044d488a /drivers/gpu/drm/amd/amdgpu/amdgpu_object.c | |
| parent | RDMA/iw_cxgb4: Fix bar2 virt addr calculation for T4 chips (diff) | |
| download | kernel-986ef95ecdd3eb6fa29433e68faa94c7624083be.tar.gz kernel-986ef95ecdd3eb6fa29433e68faa94c7624083be.zip | |
IB/mlx5: Expose correct max_sge_rd limit
mlx5 devices (Connect-IB, ConnectX-4, ConnectX-4-LX) has a limitation
where rdma read work queue entries cannot exceed 512 bytes.
A rdma_read wqe needs to fit in 512 bytes:
- wqe control segment (16 bytes)
- rdma segment (16 bytes)
- scatter elements (16 bytes each)
So max_sge_rd should be: (512 - 16 - 16) / 16 = 30.
Cc: [email protected]
Reported-by: Christoph Hellwig <[email protected]>
Tested-by: Christoph Hellwig <[email protected]>
Signed-off-by: Sagi Grimberg <[email protected]>
Signed-off-by: Leon Romanovsky <[email protected]>
Signed-off-by: Doug Ledford <[email protected]>
Diffstat (limited to 'drivers/gpu/drm/amd/amdgpu/amdgpu_object.c')
0 files changed, 0 insertions, 0 deletions