ibv_open_device (3) - Linux Manuals

ibv_open_device: open and close an RDMA device context


ibv_open_device, ibv_close_device - open and close an RDMA device context


#include <infiniband/verbs.h>

struct ibv_context *ibv_open_device(struct ibv_device *device);

int ibv_close_device(struct ibv_context *context);


ibv_open_device() opens the device device and creates a context for further use.

ibv_close_device() closes the device context context.


ibv_open_device() returns a pointer to the allocated device context, or NULL if the request fails.

ibv_close_device() returns 0 on success, -1 on failure.


ibv_close_device() does not release all the resources allocated using context context. To avoid resource leaks, the user should release all associated resources before closing a context.

Setting the environment variable **RDMAV_ALLOW_DISASSOC_DESTROY** tells the library to relate an EIO from destroy commands as a success as the kernel resources were already released. This comes to prevent memory leakage in the user space area upon device disassociation. Applications using this flag cannot call ibv_get_cq_event or ibv_get_async_event concurrently with any call to an object destruction function.


Dotan Barak <dotanba [at] gmail.com>