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| author |   Shiraz Saleem <shiraz.saleem@intel.com> | 2019-04-02 14:52:52 -0500 |
|---|---|---|
| committer |   Jason Gunthorpe <jgg@mellanox.com> | 2019-04-08 13:05:24 -0300 |
| commit | d10bcf947a3ea240351a8182d71e4aa9c8ddba56 (patch) | |
| tree | e2aff327b72cf6a8591935aaad4c77f70294c0a6 /include/rdma/ib_umem.h | |
| 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 'include/rdma/ib_umem.h')
| -rw-r--r-- | include/rdma/ib_umem.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/include/rdma/ib_umem.h b/include/rdma/ib_umem.h index 73af05db04c7..b13a2e9a50d4 100644 --- a/include/rdma/ib_umem.h +++ b/include/rdma/ib_umem.h @@ -53,7 +53,7 @@ struct ib_umem { struct work_struct work; struct sg_table sg_head; int nmap; - int npages; + unsigned int sg_nents; }; /* Returns the offset of the umem start relative to the first page. */ |