[PATCH for-next 6/6] RDMA/rxe: Implement rereg_user_mr

[Bob Pearson <rpearsonhpe@gmail.com>]

Implement the two easy cases of ib_rereg_user_mr.

Signed-off-by: Bob Pearson <rpearsonhpe@gmail.com>
---
 drivers/infiniband/sw/rxe/rxe_verbs.c | 35 +++++++++++++++++++++++++++
 drivers/infiniband/sw/rxe/rxe_verbs.h |  5 ++++
 2 files changed, 40 insertions(+)

diff --git a/drivers/infiniband/sw/rxe/rxe_verbs.c b/drivers/infiniband/sw/rxe/rxe_verbs.c
index bb2b9d40e242..f6396333bcef 100644
--- a/drivers/infiniband/sw/rxe/rxe_verbs.c
+++ b/drivers/infiniband/sw/rxe/rxe_verbs.c
@@ -1299,6 +1299,40 @@ static struct ib_mr *rxe_reg_user_mr(struct ib_pd *ibpd, u64 start,
 	return ERR_PTR(err);
 }
 
+static struct ib_mr *rxe_rereg_user_mr(struct ib_mr *ibmr, int flags,
+				       u64 start, u64 length, u64 iova,
+				       int access, struct ib_pd *ibpd,
+				       struct ib_udata *udata)
+{
+	struct rxe_mr *mr = to_rmr(ibmr);
+	struct rxe_pd *old_pd = to_rpd(ibmr->pd);
+	struct rxe_pd *pd = to_rpd(ibpd);
+
+	/* for now only support the two easy cases:
+	 * rereg_pd and rereg_access
+	 */
+	if (flags & ~RXE_MR_REREG_SUPPORTED) {
+		rxe_err_mr(mr, "flags = %#x not supported", flags);
+		return ERR_PTR(-EOPNOTSUPP);
+	}
+
+	if (flags & IB_MR_REREG_PD) {
+		rxe_put(old_pd);
+		rxe_get(pd);
+		mr->ibmr.pd = ibpd;
+	}
+
+	if (flags & IB_MR_REREG_ACCESS) {
+		if (access & ~RXE_ACCESS_SUPPORTED_MR) {
+			rxe_err_mr(mr, "access = %#x not supported", access);
+			return ERR_PTR(-EOPNOTSUPP);
+		}
+		mr->access = access;
+	}
+
+	return NULL;
+}
+
 static struct ib_mr *rxe_alloc_mr(struct ib_pd *ibpd, enum ib_mr_type mr_type,
 				  u32 max_num_sg)
 {
@@ -1451,6 +1485,7 @@ static const struct ib_device_ops rxe_dev_ops = {
 	.query_srq = rxe_query_srq,
 	.reg_user_mr = rxe_reg_user_mr,
 	.req_notify_cq = rxe_req_notify_cq,
+	.rereg_user_mr = rxe_rereg_user_mr,
 	.resize_cq = rxe_resize_cq,
 
 	INIT_RDMA_OBJ_SIZE(ib_ah, rxe_ah, ibah),
diff --git a/drivers/infiniband/sw/rxe/rxe_verbs.h b/drivers/infiniband/sw/rxe/rxe_verbs.h
index 2f2dc67f03dd..cb18b83b73c1 100644
--- a/drivers/infiniband/sw/rxe/rxe_verbs.h
+++ b/drivers/infiniband/sw/rxe/rxe_verbs.h
@@ -284,6 +284,11 @@ enum rxe_mr_lookup_type {
 	RXE_LOOKUP_REMOTE,
 };
 
+enum rxe_rereg {
+	RXE_MR_REREG_SUPPORTED	= IB_MR_REREG_PD
+				| IB_MR_REREG_ACCESS,
+};
+
 static inline int rkey_is_mw(u32 rkey)
 {
 	u32 index = rkey >> 8;
-- 
2.39.2