diff options
author | Jason Gunthorpe <jgg@mellanox.com> | 2020-01-21 09:55:04 -0400 |
---|---|---|
committer | Jason Gunthorpe <jgg@mellanox.com> | 2020-01-21 09:55:04 -0400 |
commit | e8b3a426fb4a9e2856a69b6e19de044c7416c316 (patch) | |
tree | e902f402349a14df8a733e8d4f417122673f6c24 /include/rdma/ib_verbs.h | |
parent | eaad647e5cc27f7b46a27f3b85b14c4c8a64bffa (diff) | |
parent | b2dfc6765e45a3154800333234e4952b5412d792 (diff) | |
download | blackbird-op-linux-e8b3a426fb4a9e2856a69b6e19de044c7416c316.tar.gz blackbird-op-linux-e8b3a426fb4a9e2856a69b6e19de044c7416c316.zip |
Merge tag 'rds-odp-for-5.5' into rdma.git for-next
From https://git.kernel.org/pub/scm/linux/kernel/git/leon/linux-rdma
Leon Romanovsky says:
====================
Use ODP MRs for kernel ULPs
The following series extends MR creation routines to allow creation of
user MRs through kernel ULPs as a proxy. The immediate use case is to
allow RDS to work over FS-DAX, which requires ODP (on-demand-paging)
MRs to be created and such MRs were not possible to create prior this
series.
The first part of this patchset extends RDMA to have special verb
ib_reg_user_mr(). The common use case that uses this function is a
userspace application that allocates memory for HCA access but the
responsibility to register the memory at the HCA is on an kernel ULP.
This ULP acts as an agent for the userspace application.
The second part provides advise MR functionality for ULPs. This is
integral part of ODP flows and used to trigger pagefaults in advance
to prepare memory before running working set.
The third part is actual user of those in-kernel APIs.
====================
* tag 'rds-odp-for-5.5':
net/rds: Use prefetch for On-Demand-Paging MR
net/rds: Handle ODP mr registration/unregistration
net/rds: Detect need of On-Demand-Paging memory registration
RDMA/mlx5: Fix handling of IOVA != user_va in ODP paths
IB/mlx5: Mask out unsupported ODP capabilities for kernel QPs
RDMA/mlx5: Don't fake udata for kernel path
IB/mlx5: Add ODP WQE handlers for kernel QPs
IB/core: Add interface to advise_mr for kernel users
IB/core: Introduce ib_reg_user_mr
IB: Allow calls to ib_umem_get from kernel ULPs
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Diffstat (limited to 'include/rdma/ib_verbs.h')
-rw-r--r-- | include/rdma/ib_verbs.h | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/include/rdma/ib_verbs.h b/include/rdma/ib_verbs.h index 6506df9f31ae..1f779fad3a1e 100644 --- a/include/rdma/ib_verbs.h +++ b/include/rdma/ib_verbs.h @@ -4166,6 +4166,15 @@ static inline void ib_dma_free_coherent(struct ib_device *dev, dma_free_coherent(dev->dma_device, size, cpu_addr, dma_handle); } +/* ib_reg_user_mr - register a memory region for virtual addresses from kernel + * space. This function should be called when 'current' is the owning MM. + */ +struct ib_mr *ib_reg_user_mr(struct ib_pd *pd, u64 start, u64 length, + u64 virt_addr, int mr_access_flags); + +/* ib_advise_mr - give an advice about an address range in a memory region */ +int ib_advise_mr(struct ib_pd *pd, enum ib_uverbs_advise_mr_advice advice, + u32 flags, struct ib_sge *sg_list, u32 num_sge); /** * ib_dereg_mr_user - Deregisters a memory region and removes it from the * HCA translation table. |