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author | Shiraz Saleem <shiraz.saleem@intel.com> | 2019-04-02 14:52:52 -0500 |
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committer | Jason Gunthorpe <jgg@mellanox.com> | 2019-04-08 13:05:24 -0300 |
commit | d10bcf947a3ea240351a8182d71e4aa9c8ddba56 (patch) | |
tree | e2aff327b72cf6a8591935aaad4c77f70294c0a6 /drivers/infiniband/ulp/opa_vnic/opa_vnic_vema.c | |
parent | RDMA/cm: Remove useless zeroing of static global variable (diff) | |
download | linux-dev-d10bcf947a3ea240351a8182d71e4aa9c8ddba56.tar.xz linux-dev-d10bcf947a3ea240351a8182d71e4aa9c8ddba56.zip |
RDMA/umem: Combine contiguous PAGE_SIZE regions in SGEs
Combine contiguous regions of PAGE_SIZE pages into single scatter list
entry while building the scatter table for a umem. This minimizes the
number of the entries in the scatter list and reduces the DMA mapping
overhead, particularly with the IOMMU.
Set default max_seg_size in core for IB devices to 2G and do not combine
if we exceed this limit.
Also, purge npages in struct ib_umem as we now DMA map the umem SGL with
sg_nents and npage computation is not needed. Drivers should now be using
ib_umem_num_pages(), so fix the last stragglers.
Move npages tracking to ib_umem_odp as ODP drivers still need it.
Suggested-by: Jason Gunthorpe <jgg@ziepe.ca>
Reviewed-by: Michael J. Ruhl <michael.j.ruhl@intel.com>
Reviewed-by: Ira Weiny <ira.weiny@intel.com>
Acked-by: Adit Ranadive <aditr@vmware.com>
Signed-off-by: Shiraz Saleem <shiraz.saleem@intel.com>
Tested-by: Gal Pressman <galpress@amazon.com>
Tested-by: Selvin Xavier <selvin.xavier@broadcom.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Diffstat (limited to '')
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