diff options
| author | Parav Pandit <parav@nvidia.com> | 2021-04-18 16:55:52 +0300 |
|---|---|---|
| committer | Jason Gunthorpe <jgg@nvidia.com> | 2021-04-22 02:27:52 +0300 |
| commit | 4d51c3d9de4bf5b9d637966dce9d1df77ed93288 (patch) | |
| tree | d8045cedbcf93f61b083a7dd450d5b191a0b23c6 /drivers/infiniband | |
| parent | 45062f441590810772959d8e1f2b24ba57ce1bd9 (diff) | |
| download | linux-4d51c3d9de4bf5b9d637966dce9d1df77ed93288.tar.xz | |
RDMA/cma: Skip device which doesn't support CM
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.
cma_listen_on_all()
cma_listen_on_dev()
_cma_attach_to_dev()
rdma_listen() <- fails on a specific switchdev device
This is because rdma_listen() is hardwired to only work with iwarp or IB
CM compatible devices.
Hence, when a IB device doesn't support IB CM or IW CM, avoid adding such
device to the cma list so rdma_listen() can't even be called.
Link: https://lore.kernel.org/r/f9cac00d52864ea7c61295e43fb64cf4db4fdae6.1618753862.git.leonro@nvidia.com
Signed-off-by: Parav Pandit <parav@nvidia.com>
Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Diffstat (limited to 'drivers/infiniband')
| -rw-r--r-- | drivers/infiniband/core/cma.c | 14 |
1 files changed, 14 insertions, 0 deletions
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; |