From: Jiri Pirko <[email protected]> Document the rdma_cm configfs limitation: configfs is global, so same-named RDMA devices in different net namespaces cannot both be represented there.
Signed-off-by: Jiri Pirko <[email protected]> --- Documentation/ABI/testing/configfs-rdma_cm | 4 ++++ drivers/infiniband/core/cma_configfs.c | 4 ++++ 2 files changed, 8 insertions(+) diff --git a/Documentation/ABI/testing/configfs-rdma_cm b/Documentation/ABI/testing/configfs-rdma_cm index 74f9506f42e7..739f7b6a1259 100644 --- a/Documentation/ABI/testing/configfs-rdma_cm +++ b/Documentation/ABI/testing/configfs-rdma_cm @@ -12,6 +12,10 @@ Description: Interface is used to configure RDMA-cable HCAs in respect to for this HCA has to be created: mkdir -p /config/rdma_cm/<hca> + Note: configfs has no network namespace support, so this + interface cannot represent two devices that share a name in + different network namespaces (possible in exclusive netns mode). + What: /config/rdma_cm/<hca>/ports/<port-num>/default_roce_mode Date: November 29, 2015 diff --git a/drivers/infiniband/core/cma_configfs.c b/drivers/infiniband/core/cma_configfs.c index 891e52afb8f4..c389d4e37b6b 100644 --- a/drivers/infiniband/core/cma_configfs.c +++ b/drivers/infiniband/core/cma_configfs.c @@ -65,6 +65,10 @@ static struct cma_dev_port_group *to_dev_port_group(struct config_item *item) return container_of(group, struct cma_dev_port_group, group); } +/* + * configfs is not net namespace aware, so a name shared by devices in + * different namespaces resolves to the first match here. + */ static bool filter_by_name(struct ib_device *ib_dev, void *cookie) { return !strcmp(dev_name(&ib_dev->dev), cookie); -- 2.54.0
