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RDMA/irdma: Do not directly rely on IB_PD_UNSAFE_GLOBAL_RKEY

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[ Upstream commit 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: bb6d73d9ad ("RDMA/irdma: Prevent zero-length STAG registration")
Signed-off-by: Jacob Moroni <jmoroni@google.com>
Signed-off-by: Tatyana Nikolova <tatyana.e.nikolova@intel.com>
Link: https://patch.msgid.link/20251125025350.180-7-tatyana.e.nikolova@intel.com
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Jacob Moroni 2025-11-24 20:53:47 -06:00 • committed by Greg Kroah-Hartman
commit 6567f40a75
4 changed files with 12 additions and 10 deletions
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