RDMA/core: Resolve MAC of next-hop device without ARP support

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[ Upstream commit 200651b9b8 ]

Currently, if the next-hop netdevice does not support ARP resolution,
the destination MAC address is silently set to zero without reporting
an error. This leads to incorrect behavior and may result in packet
transmission failures.

Fix this by deferring MAC resolution to the IP stack via neighbour
lookup, allowing proper resolution or error reporting as appropriate.

Fixes: 7025fcd36b ("IB: address translation to map IP toIB addresses (GIDs)")
Signed-off-by: Parav Pandit <parav@nvidia.com>
Reviewed-by: Vlad Dumitrescu <vdumitrescu@nvidia.com>
Signed-off-by: Edward Srouji <edwards@nvidia.com>
Link: https://patch.msgid.link/20250916111103.84069-3-edwards@nvidia.com
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

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Parav Pandit 2025-09-16 14:11:01 +03:00 • committed by Greg Kroah-Hartman

parent 11559d14ed

commit 5f4abda482

1 changed files with 3 additions and 7 deletions

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drivers/infiniband/core/addr.c

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