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RDMA: Add NLDEV_GET_CHARDEV to allow char dev discovery and autoload

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Allow userspace to issue a netlink query against the ib_device for
something like "uverbs" and get back the char dev name, inode major/minor,
and interface ABI information for "uverbs0".

Since we are now in netlink this can also trigger a module autoload to
make the uverbs device come into existence.

Largely this will let us replace searching and reading inside sysfs to
setup devices, and provides an alternative (using driver_id) to device
name based provider binding for things like rxe.

Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
This commit is contained in:
Jason Gunthorpe
2019-06-13 21:38:18 -03:00
committed by Doug Ledford
parent 5d60c11154
commit 0e2d00eb6f
6 changed files with 221 additions and 0 deletions
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4
include/rdma/ib_verbs.h
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@@ -2684,10 +2684,14 @@ struct ib_device {
u32 iw_driver_flags;
};
struct ib_client_nl_info;
struct ib_client {
const char *name;
void (*add) (struct ib_device *);
void (*remove)(struct ib_device *, void *client_data);
int (*get_nl_info)(struct ib_device *ibdev, void *client_data,
struct ib_client_nl_info *res);
int (*get_global_nl_info)(struct ib_client_nl_info *res);
/* Returns the net_dev belonging to this ib_client and matching the
* given parameters.