Chuck Lever bea28ac14c
RDMA/core: add MR support for bvec-based RDMA operations ...
The bvec-based RDMA API currently returns -EOPNOTSUPP when Memory
Region registration is required. This prevents iWARP devices from
using the bvec path, since iWARP requires MR registration for RDMA
READ operations. The force_mr debug parameter is also unusable with
bvec input.
Add rdma_rw_init_mr_wrs_bvec() to handle MR registration for bvec
arrays. The approach creates a synthetic scatterlist populated with
DMA addresses from the bvecs, then reuses the existing ib_map_mr_sg()
infrastructure. This avoids driver changes while keeping the
implementation small.
The synthetic scatterlist is stored in the rdma_rw_ctx for cleanup.
On destroy, the MRs are returned to the pool and the bvec DMA
mappings are released using the stored addresses.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com >
Link: https://patch.msgid.link/20260128005400.25147-4-cel@kernel.org
Reviewed-by: Christoph Hellwig <hch@lst.de >
Signed-off-by: Leon Romanovsky <leon@kernel.org >
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