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-rw-r--r--include/rdma/ib_verbs.h46
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.