RDMA/bnxt_re: Add support for MR Relaxed Ordering

Some of the adapters support Relaxed Ordering for the MRs.
Driver queries support for Memory region relax ordering  support from
firmware and  set relax ordering bit in REGISTER_MR request, if the users
request for the support. Also, this is supported only if the PCIe device
has enabled relaxed ordering attribute.
Reviewed-by: Chandramohan Akula <chandramohan.akula@broadcom.com>
Reviewed-by: Selvin Xavier <selvin.xavier@broadcom.com>
Reviewed-by: Vijay Kumar Mandadapu <vijaykumar.mandadapu@broadcom.com>
Signed-off-by: Kalesh AP <kalesh-anakkur.purayil@broadcom.com>
Signed-off-by: Selvin Xavier <selvin.xavier@broadcom.com>
Link: https://patch.msgid.link/1725256351-12751-5-git-send-email-selvin.xavier@broadcom.comSigned-off-by: Leon Romanovsky <leon@kernel.org>

drivers/infiniband/hw/bnxt_re/ib_verbs.c

@@ -115,6 +115,14 @@ static enum ib_access_flags __to_ib_access_flags(int qflags)
 	return iflags;
 };
 
+static void bnxt_re_check_and_set_relaxed_ordering(struct bnxt_re_dev *rdev,
+						   struct bnxt_qplib_mrw *qplib_mr)
+{
+	if (_is_relaxed_ordering_supported(rdev->dev_attr.dev_cap_flags2) &&
+	    pcie_relaxed_ordering_enabled(rdev->en_dev->pdev))
+		qplib_mr->flags |= CMDQ_REGISTER_MR_FLAGS_ENABLE_RO;
+}
+
 static int bnxt_re_build_sgl(struct ib_sge *ib_sg_list,
 			     struct bnxt_qplib_sge *sg_list, int num)
 {
@@ -3888,6 +3896,9 @@ struct ib_mr *bnxt_re_get_dma_mr(struct ib_pd *ib_pd, int mr_access_flags)
 	mr->qplib_mr.access_flags = __from_ib_access_flags(mr_access_flags);
 	mr->qplib_mr.type = CMDQ_ALLOCATE_MRW_MRW_FLAGS_PMR;
 
+	if (mr_access_flags & IB_ACCESS_RELAXED_ORDERING)
+		bnxt_re_check_and_set_relaxed_ordering(rdev, &mr->qplib_mr);
+
 	/* Allocate and register 0 as the address */
 	rc = bnxt_qplib_alloc_mrw(&rdev->qplib_res, &mr->qplib_mr);
 	if (rc)
@@ -4121,6 +4132,9 @@ static struct ib_mr *__bnxt_re_user_reg_mr(struct ib_pd *ib_pd, u64 length, u64
 	mr->qplib_mr.va = virt_addr;
 	mr->qplib_mr.total_size = length;
 
+	if (mr_access_flags & IB_ACCESS_RELAXED_ORDERING)
+		bnxt_re_check_and_set_relaxed_ordering(rdev, &mr->qplib_mr);
+
 	umem_pgs = ib_umem_num_dma_blocks(umem, page_size);
 	rc = bnxt_qplib_reg_mr(&rdev->qplib_res, &mr->qplib_mr, umem,
 			       umem_pgs, page_size);

drivers/infiniband/hw/bnxt_re/qplib_res.h

@@ -570,4 +570,9 @@ static inline bool _is_alloc_mr_unified(u16 dev_cap_flags)
 	return dev_cap_flags & CREQ_QUERY_FUNC_RESP_SB_MR_REGISTER_ALLOC;
 }
 
+static inline bool _is_relaxed_ordering_supported(u16 dev_cap_ext_flags2)
+{
+	return dev_cap_ext_flags2 & CREQ_QUERY_FUNC_RESP_SB_MEMORY_REGION_RO_SUPPORTED;
+}
+
 #endif /* __BNXT_QPLIB_RES_H__ */