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nvme: find numa distance only if controller has valid numa id 

On system where native nvme multipath is configured and iopolicy
is set to numa but the nvme controller numa node id is undefined
or -1 (NUMA_NO_NODE) then avoid calculating node distance for
finding optimal io path. In such case we may access numa distance
table with invalid index and that may potentially refer to incorrect
memory. So this patch ensures that if the nvme controller numa node
id is -1 then instead of calculating node distance for finding optimal
io path, we set the numa node distance of such controller to default 10
(LOCAL_DISTANCE).

Link: https://lore.kernel.org/all/20240413090614.678353-1-nilay@linux.ibm.com/
Signed-off-by: Nilay Shroff <nilay@linux.ibm.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com>
Signed-off-by: Keith Busch <kbusch@kernel.org>
This commit is contained in:
Nilay Shroff 2024-04-16 13:49:23 +05:30 committed by Keith Busch
parent 0bc2e80b9b
commit 863fe60ed2
1 changed files with 2 additions and 1 deletions
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3
drivers/nvme/host/multipath.c
View File

@ -247,7 +247,8 @@ static struct nvme_ns *__nvme_find_path(struct nvme_ns_head *head, int node)
if (nvme_path_is_disabled(ns))
continue;
if (READ_ONCE(head->subsys->iopolicy) == NVME_IOPOLICY_NUMA)
if (ns->ctrl->numa_node != NUMA_NO_NODE &&
READ_ONCE(head->subsys->iopolicy) == NVME_IOPOLICY_NUMA)
distance = node_distance(node, ns->ctrl->numa_node);
else
distance = LOCAL_DISTANCE;