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71d3bdae5e
The HW disables bounds checking for MRs with a length of zero, so
the driver will only allow a zero length MR if the "all_memory"
flag is set, and this flag is only set if IB_PD_UNSAFE_GLOBAL_RKEY
is set for the PD.
This means that the "get_dma_mr" method will currently fail unless
the IB_PD_UNSAFE_GLOBAL_RKEY flag is set. This has not been an issue
because the "get_dma_mr" method is only ever invoked if the device
does not support the local DMA key or if IB_PD_UNSAFE_GLOBAL_RKEY
is set, and so far, all IRDMA HW supports the local DMA lkey.
However, some new HW does not support the local DMA lkey, so the
"get_dma_mr" method needs to work without IB_PD_UNSAFE_GLOBAL_RKEY
being set.
To support HW that does not allow the local DMA lkey, the logic has
been changed to pass an explicit flag to indicate when a dma_mr is
being created so that the zero length will be allowed.
Also, the "all_memory" flag has been forced to false for normal MR
allocation since these MRs are never supposed to provide global
unsafe rkey semantics anyway; only the MR created with "get_dma_mr"
should support this.
Fixes:
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||
|---|---|---|
| arch | ||
| block | ||
| certs | ||
| crypto | ||
| Documentation | ||
| drivers | ||
| fs | ||
| include | ||
| init | ||
| io_uring | ||
| ipc | ||
| kernel | ||
| lib | ||
| LICENSES | ||
| mm | ||
| net | ||
| rust | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .clippy.toml | ||
| .cocciconfig | ||
| .editorconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| .pylintrc | ||
| .rustfmt.toml | ||
| COPYING | ||
| CREDITS | ||
| Kbuild | ||
| Kconfig | ||
| MAINTAINERS | ||
| Makefile | ||
| README | ||
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.