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RDMA/core: Add module param to disable device sharing among net ns 

Add module parameter to change a sharing mode of ib_core early in the
boot process. This parameter helps to those systems where modern up
to date rdma tool (iproute2) package may not be available during
kernel upgrade cycle.

Signed-off-by: Parav Pandit <parav@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
This commit is contained in:
Parav Pandit 2019-02-26 14:01:45 +02:00 committed by Jason Gunthorpe
parent 5417783eab
commit a56bc45b27
1 changed files with 7 additions and 0 deletions
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7
drivers/infiniband/core/device.c
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@ -127,6 +127,10 @@ static DEFINE_XARRAY_FLAGS(rdma_nets, XA_FLAGS_ALLOC);
*/
static DECLARE_RWSEM(rdma_nets_rwsem);
static bool ib_devices_shared_netns = true;
module_param_named(netns_mode, ib_devices_shared_netns, bool, 0444);
MODULE_PARM_DESC(netns_mode,
"Share device among net namespaces; default=1 (shared)");
/*
* xarray has this behavior where it won't iterate over NULL values stored in
* allocated arrays. So we need our own iterator to see all values stored in
@ -736,6 +740,9 @@ static int add_one_compat_dev(struct ib_device *device,
struct ib_core_device *cdev;
int ret;
if (!ib_devices_shared_netns)
return 0;
/*
* Create and add compat device in all namespaces other than where it
* is currently bound to.