[dpdk-dev] [PATCH v2 1/5] common/mlx5: glue MR registration with IOVA

[Matan Azrad <matan@nvidia.com>]

From: Michael Baum <michaelba@oss.nvidia.com>

Add support for rdma-core API to register IOVA MR.
The API gets the process VA, size, and IOVA and returns a memory region
with space pointed by a specific IOVA.

So any access in this MR should come with an address that is relative to
the IOVA specified in the API.

Fixes: cc07a42da250 ("vdpa/mlx5: prepare memory regions")
Cc: stable@dpdk.org

Signed-off-by: Michael Baum <michaelba@oss.nvidia.com>
Signed-off-by: Matan Azrad <matan@nvidia.com>
---
 drivers/common/mlx5/linux/meson.build |  2 ++
 drivers/common/mlx5/linux/mlx5_glue.c | 18 ++++++++++++++++++
 drivers/common/mlx5/linux/mlx5_glue.h |  3 +++
 3 files changed, 23 insertions(+)

diff --git a/drivers/common/mlx5/linux/meson.build b/drivers/common/mlx5/linux/meson.build
index 2dcd27b778..7909f23e21 100644
--- a/drivers/common/mlx5/linux/meson.build
+++ b/drivers/common/mlx5/linux/meson.build
@@ -200,6 +200,8 @@ has_sym_args = [
             'MLX5DV_DR_ACTION_FLAGS_ASO_CT_DIRECTION_INITIATOR' ],
         [ 'HAVE_MLX5_DR_ALLOW_DUPLICATE', 'infiniband/mlx5dv.h',
             'mlx5dv_dr_domain_allow_duplicate_rules' ],
+        [ 'HAVE_MLX5_IBV_REG_MR_IOVA', 'infiniband/verbs.h',
+            'ibv_reg_mr_iova' ],
 ]
 config = configuration_data()
 foreach arg:has_sym_args
diff --git a/drivers/common/mlx5/linux/mlx5_glue.c b/drivers/common/mlx5/linux/mlx5_glue.c
index 037ca961a0..bc6622053f 100644
--- a/drivers/common/mlx5/linux/mlx5_glue.c
+++ b/drivers/common/mlx5/linux/mlx5_glue.c
@@ -224,6 +224,23 @@ mlx5_glue_reg_mr(struct ibv_pd *pd, void *addr, size_t length, int access)
 	return ibv_reg_mr(pd, addr, length, access);
 }
 
+static struct ibv_mr *
+mlx5_glue_reg_mr_iova(struct ibv_pd *pd, void *addr, size_t length,
+		      uint64_t iova, int access)
+{
+#ifdef HAVE_MLX5_IBV_REG_MR_IOVA
+		return ibv_reg_mr_iova(pd, addr, length, iova, access);
+#else
+	(void)pd;
+	(void)addr;
+	(void)length;
+	(void)iova;
+	(void)access;
+	errno = ENOTSUP;
+	return NULL;
+#endif
+}
+
 static struct ibv_mr *
 mlx5_glue_alloc_null_mr(struct ibv_pd *pd)
 {
@@ -1412,6 +1429,7 @@ const struct mlx5_glue *mlx5_glue = &(const struct mlx5_glue) {
 	.destroy_qp = mlx5_glue_destroy_qp,
 	.modify_qp = mlx5_glue_modify_qp,
 	.reg_mr = mlx5_glue_reg_mr,
+	.reg_mr_iova = mlx5_glue_reg_mr_iova,
 	.alloc_null_mr = mlx5_glue_alloc_null_mr,
 	.dereg_mr = mlx5_glue_dereg_mr,
 	.create_counter_set = mlx5_glue_create_counter_set,
diff --git a/drivers/common/mlx5/linux/mlx5_glue.h b/drivers/common/mlx5/linux/mlx5_glue.h
index f39ef2dac7..4e6d31f263 100644
--- a/drivers/common/mlx5/linux/mlx5_glue.h
+++ b/drivers/common/mlx5/linux/mlx5_glue.h
@@ -197,6 +197,9 @@ struct mlx5_glue {
 			 int attr_mask);
 	struct ibv_mr *(*reg_mr)(struct ibv_pd *pd, void *addr,
 				 size_t length, int access);
+	struct ibv_mr *(*reg_mr_iova)(struct ibv_pd *pd, void *addr,
+				      size_t length, uint64_t iova,
+				      int access);
 	struct ibv_mr *(*alloc_null_mr)(struct ibv_pd *pd);
 	int (*dereg_mr)(struct ibv_mr *mr);
 	struct ibv_counter_set *(*create_counter_set)
-- 
2.25.1