This function returns the namespace of a struct ib_device if the RDMA
subsystem is in exclusive network namespace mode. If the subsystem is
in shared namespace mode, this function returns NULL.
Signed-off-by: Ka-Cheong Poon <ka-cheong.poon@xxxxxxxxxx>
---
drivers/infiniband/core/device.c | 16 ++++++++++++++++
include/rdma/ib_verbs.h | 1 +
2 files changed, 17 insertions(+)
diff --git a/drivers/infiniband/core/device.c b/drivers/infiniband/core/device.c
index c36b4d2b61e0..a3dd95bf3050 100644
--- a/drivers/infiniband/core/device.c
+++ b/drivers/infiniband/core/device.c
@@ -144,6 +144,22 @@ bool rdma_dev_access_netns(const struct ib_device *dev, const struct net *net)
}
EXPORT_SYMBOL(rdma_dev_access_netns);
+/**
+ * rdma_dev_to_netns() - Return the net namespace of a given device if the
+ * RDMA subsystem is in exclusive network namespace
+ * mode. If it is in shared namespace mode, this
+ * function returns NULL. Caller can use it to
+ * differentiate the two modes of the RDMA subsystem.
+ *
+ * @device: Pointer to rdma device to get the namespace
+ */
+struct net *rdma_dev_to_netns(const struct ib_device *device)
+{
+ return ib_devices_shared_netns ? NULL :
+ read_pnet(&device->coredev.rdma_net);
+}
+EXPORT_SYMBOL(rdma_dev_to_netns);
+
/*
* 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
diff --git a/include/rdma/ib_verbs.h b/include/rdma/ib_verbs.h
index c0b2fa7e9b95..aeced1a3324f 100644
--- a/include/rdma/ib_verbs.h
+++ b/include/rdma/ib_verbs.h
@@ -4715,6 +4715,7 @@ static inline struct ib_device *rdma_device_to_ibdev(struct device *device)
bool rdma_dev_access_netns(const struct ib_device *device,
const struct net *net);
+struct net *rdma_dev_to_netns(const struct ib_device *device);
#define IB_ROCE_UDP_ENCAP_VALID_PORT_MIN (0xC000)
#define IB_GRH_FLOWLABEL_MASK (0x000FFFFF)
--
2.18.4
