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

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[ Upstream commit 200651b9b8aadfbbec852f0e5d042d9abe75e2ab ]

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>
This commit is contained in:
Parav Pandit 2025-09-16 14:11:01 +03:00 committed by Greg Kroah-Hartman
parent 05639cb84e
commit 4703174764
1 changed files with 3 additions and 7 deletions
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10
drivers/infiniband/core/addr.c
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@ -460,14 +460,10 @@ static int addr_resolve_neigh(const struct dst_entry *dst,
{
int ret = 0;
if (ndev_flags & IFF_LOOPBACK) {
if (ndev_flags & IFF_LOOPBACK)
memcpy(addr->dst_dev_addr, addr->src_dev_addr, MAX_ADDR_LEN);
} else {
if (!(ndev_flags & IFF_NOARP)) {
/* If the device doesn't do ARP internally */
ret = fetch_ha(dst, addr, dst_in, seq);
}
}
else
ret = fetch_ha(dst, addr, dst_in, seq);
return ret;
}