From: Parav Pandit <parav@xxxxxxxxxx>
A switchdev RDMA device do not support IB CM. When such device is added
to the RDMA CM's device list, when application invokes rdma_listen(),
cma attempts to listen to such device, however it has IB CM attribute
disabled
.
Due to this, rdma_listen() call fails to listen for other non
switchdev devices as well.
A below error message can be seen.
infiniband mlx5_0: RDMA CMA: cma_listen_on_dev, error -38
A failing call flow is below.
rdma_listen()
cma_listen_on_all()
cma_listen_on_dev()
_cma_attach_to_dev()
rdma_listen() <- fails on a specific switchdev device
Hence, when a IB device doesn't support IB CM or IW CM, avoid adding
such device to the cma list.
Signed-off-by: Parav Pandit <parav@xxxxxxxxxx>
Signed-off-by: Leon Romanovsky <leonro@xxxxxxxxxx>
---
drivers/infiniband/core/cma.c | 14 ++++++++++++++
1 file changed, 14 insertions(+)
diff --git a/drivers/infiniband/core/cma.c b/drivers/infiniband/core/cma.c
index bb7bd024f3bd..2dc302a83014 100644
--- a/drivers/infiniband/core/cma.c
+++ b/drivers/infiniband/core/cma.c
@@ -4900,6 +4900,17 @@ static void cma_process_remove(struct cma_device *cma_dev)
wait_for_completion(&cma_dev->comp);
}
+static bool cma_supported(struct ib_device *device)
+{
+ u32 i;
+
+ rdma_for_each_port(device, i) {
+ if (rdma_cap_ib_cm(device, i) || rdma_cap_iw_cm(device, i))
+ return true;
+ }
+ return false;
+}
+
static int cma_add_one(struct ib_device *device)
{
struct rdma_id_private *to_destroy;
@@ -4909,6 +4920,9 @@ static int cma_add_one(struct ib_device *device)
int ret;
u32 i;
+ if (!cma_supported(device))
+ return -EOPNOTSUPP;
+
cma_dev = kmalloc(sizeof(*cma_dev), GFP_KERNEL);
if (!cma_dev)
return -ENOMEM;
--
2.30.2
