[PATCH for-next 4/4] RDMA/bnxt_re: Add support for MR Relaxed Ordering

[Selvin Xavier <selvin.xavier@broadcom.com>]

From: Kalesh AP <kalesh-anakkur.purayil@broadcom.com>

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>
---
 drivers/infiniband/hw/bnxt_re/ib_verbs.c  | 14 ++++++++++++++
 drivers/infiniband/hw/bnxt_re/qplib_res.h |  5 +++++
 2 files changed, 19 insertions(+)

diff --git a/drivers/infiniband/hw/bnxt_re/ib_verbs.c b/drivers/infiniband/hw/bnxt_re/ib_verbs.c
index 50cf3ec..a081580 100644
--- a/drivers/infiniband/hw/bnxt_re/ib_verbs.c
+++ b/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)
 {
@@ -3875,6 +3883,9 @@ 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)
@@ -4108,6 +4119,9 @@ 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);
diff --git a/drivers/infiniband/hw/bnxt_re/qplib_res.h b/drivers/infiniband/hw/bnxt_re/qplib_res.h
index b452b2f..049805a 100644
--- a/drivers/infiniband/hw/bnxt_re/qplib_res.h
+++ b/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__ */
-- 
2.5.5