RDMA/rxe: Implement rereg_user_mr

Implement the two easy cases of ib_rereg_user_mr.

Link: https://lore.kernel.org/r/20230530221334.89432-7-rpearsonhpe@gmail.com
Signed-off-by: Bob Pearson <rpearsonhpe@gmail.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

diff --git a/drivers/infiniband/sw/rxe/rxe_verbs.c b/drivers/infiniband/sw/rxe/rxe_verbs.c
index bb2b9d4..f639633 100644 (file)
--- a/drivers/infiniband/sw/rxe/rxe_verbs.c
+++ b/drivers/infiniband/sw/rxe/rxe_verbs.c
@@ -1299,6 +1299,40 @@ err_free:
        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 2f2dc67..cb18b83 100644 (file)
--- 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;