diff options
Diffstat (limited to 'include/rdma/ib_verbs.h')
| -rw-r--r-- | include/rdma/ib_verbs.h | 46 |
1 files changed, 45 insertions, 1 deletions
diff --git a/include/rdma/ib_verbs.h b/include/rdma/ib_verbs.h index 8e726fff30fe..e1130c6c1377 100644 --- a/include/rdma/ib_verbs.h +++ b/include/rdma/ib_verbs.h @@ -1476,7 +1476,10 @@ struct ib_fmr_attr { struct ib_umem; enum rdma_remove_reason { - /* Userspace requested uobject deletion. Call could fail */ + /* + * Userspace requested uobject deletion or initial try + * to remove uobject via cleanup. Call could fail + */ RDMA_REMOVE_DESTROY, /* Context deletion. This call should delete the actual object itself */ RDMA_REMOVE_CLOSE, @@ -1503,6 +1506,7 @@ struct ib_ucontext { /* protects cleanup process from other actions */ struct rw_semaphore cleanup_rwsem; enum rdma_remove_reason cleanup_reason; + bool cleanup_retryable; struct pid *tgid; #ifdef CONFIG_INFINIBAND_ON_DEMAND_PAGING @@ -2685,6 +2689,46 @@ static inline bool ib_is_udata_cleared(struct ib_udata *udata, } /** + * ib_is_destroy_retryable - Check whether the uobject destruction + * is retryable. + * @ret: The initial destruction return code + * @why: remove reason + * @uobj: The uobject that is destroyed + * + * This function is a helper function that IB layer and low-level drivers + * can use to consider whether the destruction of the given uobject is + * retry-able. + * It checks the original return code, if it wasn't success the destruction + * is retryable according to the ucontext state (i.e. cleanup_retryable) and + * the remove reason. (i.e. why). + * Must be called with the object locked for destroy. + */ +static inline bool ib_is_destroy_retryable(int ret, enum rdma_remove_reason why, + struct ib_uobject *uobj) +{ + return ret && (why == RDMA_REMOVE_DESTROY || + uobj->context->cleanup_retryable); +} + +/** + * ib_destroy_usecnt - Called during destruction to check the usecnt + * @usecnt: The usecnt atomic + * @why: remove reason + * @uobj: The uobject that is destroyed + * + * Non-zero usecnts will block destruction unless destruction was triggered by + * a ucontext cleanup. + */ +static inline int ib_destroy_usecnt(atomic_t *usecnt, + enum rdma_remove_reason why, + struct ib_uobject *uobj) +{ + if (atomic_read(usecnt) && ib_is_destroy_retryable(-EBUSY, why, uobj)) + return -EBUSY; + return 0; +} + +/** * ib_modify_qp_is_ok - Check that the supplied attribute mask * contains all required attributes and no attributes not allowed for * the given QP state transition. |