5.4-stable review patch. If anyone has any objections, please let me know.
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From: Parav Pandit parav@nvidia.com
[ 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: 7025fcd36bd6 ("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 --- drivers/infiniband/core/addr.c | 10 +++------- 1 file changed, 3 insertions(+), 7 deletions(-)
diff --git a/drivers/infiniband/core/addr.c b/drivers/infiniband/core/addr.c index c9e63c692b6e8..48de2285922f8 100644 --- a/drivers/infiniband/core/addr.c +++ b/drivers/infiniband/core/addr.c @@ -459,14 +459,10 @@ 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; }