IB/core: Add user MR re-registration support

Memory re-registration is a feature that enables changing the
attributes of a memory region registered by user-space, including PD,
translation (address and length) and access flags.

Add the required support in uverbs and the kernel verbs API.

Signed-off-by: Matan Barak <matanb@mellanox.com>
Signed-off-by: Or Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>

1 files changed, 9 insertions, 1 deletions

diff --git a/include/rdma/ib_verbs.h b/include/rdma/ib_verbs.h
index 7ccef342f724..ed44cc07a7b3 100644
--- a/include/rdma/ib_verbs.h
+++ b/include/rdma/ib_verbs.h
@@ -1097,7 +1097,8 @@ struct ib_mr_attr {
 enum ib_mr_rereg_flags {
         IB_MR_REREG_TRANS       = 1,
         IB_MR_REREG_PD          = (1<<1),
-        IB_MR_REREG_ACCESS      = (1<<2)
+        IB_MR_REREG_ACCESS      = (1<<2),
+        IB_MR_REREG_SUPPORTED   = ((IB_MR_REREG_ACCESS << 1) - 1)
 };
 
 /**
@@ -1547,6 +1548,13 @@ struct ib_device {
                                                   u64 virt_addr,
                                                   int mr_access_flags,
                                                   struct ib_udata *udata);
+        int                        (*rereg_user_mr)(struct ib_mr *mr,
+                                                    int flags,
+                                                    u64 start, u64 length,
+                                                    u64 virt_addr,
+                                                    int mr_access_flags,
+                                                    struct ib_pd *pd,
+                                                    struct ib_udata *udata);
         int                        (*query_mr)(struct ib_mr *mr,
                                                struct ib_mr_attr *mr_attr);
         int                        (*dereg_mr)(struct ib_mr *mr);