[dpdk-dev] [PATCH v1 16/38] common/mlx5: glue VAR allocation

[Matan Azrad <matan@mellanox.com>]

Virtio access region(VAR) is the UAR that allocated for virtio emulation
access.

Add rdma-core operations to allocate and free VAR.

Signed-off-by: Matan Azrad <matan@mellanox.com>
---
 drivers/common/mlx5/Makefile    |  5 +++++
 drivers/common/mlx5/meson.build |  1 +
 drivers/common/mlx5/mlx5_glue.c | 26 ++++++++++++++++++++++++++
 drivers/common/mlx5/mlx5_glue.h |  8 ++++++++
 4 files changed, 40 insertions(+)

diff --git a/drivers/common/mlx5/Makefile b/drivers/common/mlx5/Makefile
index 6b618ad..82403a2 100644
--- a/drivers/common/mlx5/Makefile
+++ b/drivers/common/mlx5/Makefile
@@ -175,6 +175,11 @@ mlx5_autoconf.h.new: $(RTE_SDK)/buildtools/auto-config-h.sh
 		enum MLX5_MMAP_GET_NC_PAGES_CMD \
 		$(AUTOCONF_OUTPUT)
 	$Q sh -- '$<' '$@' \
+		HAVE_IBV_VAR \
+		infiniband/mlx5dv.h \
+		func mlx5dv_alloc_var \
+		$(AUTOCONF_OUTPUT)
+	$Q sh -- '$<' '$@' \
 		HAVE_ETHTOOL_LINK_MODE_25G \
 		/usr/include/linux/ethtool.h \
 		enum ETHTOOL_LINK_MODE_25000baseCR_Full_BIT \
diff --git a/drivers/common/mlx5/meson.build b/drivers/common/mlx5/meson.build
index fa11fd9..74419c6 100644
--- a/drivers/common/mlx5/meson.build
+++ b/drivers/common/mlx5/meson.build
@@ -120,6 +120,7 @@ if build
 		'MLX5DV_DR_DOMAIN_TYPE_FDB' ],
 		[ 'HAVE_MLX5DV_DR_VLAN', 'infiniband/mlx5dv.h',
 		'mlx5dv_dr_action_create_push_vlan' ],
+		[ 'HAVE_IBV_VAR', 'infiniband/mlx5dv.h', 'mlx5dv_alloc_var' ],
 		[ 'HAVE_SUPPORTED_40000baseKR4_Full', 'linux/ethtool.h',
 		'SUPPORTED_40000baseKR4_Full' ],
 		[ 'HAVE_SUPPORTED_40000baseCR4_Full', 'linux/ethtool.h',
diff --git a/drivers/common/mlx5/mlx5_glue.c b/drivers/common/mlx5/mlx5_glue.c
index 8fbe6fd..a3e392c 100644
--- a/drivers/common/mlx5/mlx5_glue.c
+++ b/drivers/common/mlx5/mlx5_glue.c
@@ -1160,6 +1160,30 @@
 #endif
 }
 
+static struct mlx5dv_var *
+mlx5_glue_dv_alloc_var(struct ibv_context *context, uint32_t flags)
+{
+#ifdef HAVE_IBV_VAR
+	return mlx5dv_alloc_var(context, flags);
+#else
+	(void)context;
+	(void)flags;
+	errno = ENOTSUP;
+	return NULL;
+#endif
+}
+
+static void
+mlx5_glue_dv_free_var(struct mlx5dv_var *var)
+{
+#ifdef HAVE_IBV_VAR
+	mlx5dv_free_var(var);
+#else
+	(void)var;
+	errno = ENOTSUP;
+#endif
+}
+
 alignas(RTE_CACHE_LINE_SIZE)
 const struct mlx5_glue *mlx5_glue = &(const struct mlx5_glue){
 	.version = MLX5_GLUE_VERSION,
@@ -1267,4 +1291,6 @@
 	.devx_get_event = mlx5_glue_devx_get_event,
 	.devx_alloc_uar = mlx5_glue_devx_alloc_uar,
 	.devx_free_uar = mlx5_glue_devx_free_uar,
+	.dv_alloc_var = mlx5_glue_dv_alloc_var,
+	.dv_free_var = mlx5_glue_dv_free_var,
 };
diff --git a/drivers/common/mlx5/mlx5_glue.h b/drivers/common/mlx5/mlx5_glue.h
index 7d9256e..6238b43 100644
--- a/drivers/common/mlx5/mlx5_glue.h
+++ b/drivers/common/mlx5/mlx5_glue.h
@@ -93,6 +93,11 @@
 #define MLX5DV_DEVX_CREATE_EVENT_CHANNEL_FLAGS_OMIT_EV_DATA 1
 #endif
 
+#ifndef HAVE_IBV_VAR
+struct mlx5dv_var { uint32_t page_id; uint32_t length; off_t mmap_off;
+			uint64_t comp_mask; };
+#endif
+
 /* LIB_GLUE_VERSION must be updated every time this structure is modified. */
 struct mlx5_glue {
 	const char *version;
@@ -231,6 +236,9 @@ struct mlx5_glue {
 	int (*dv_destroy_flow)(void *flow);
 	int (*dv_destroy_flow_matcher)(void *matcher);
 	struct ibv_context *(*dv_open_device)(struct ibv_device *device);
+	struct mlx5dv_var *(*dv_alloc_var)(struct ibv_context *context,
+					   uint32_t flags);
+	void (*dv_free_var)(struct mlx5dv_var *var);
 	struct mlx5dv_devx_uar *(*devx_alloc_uar)(struct ibv_context *context,
 						  uint32_t flags);
 	void (*devx_free_uar)(struct mlx5dv_devx_uar *devx_uar);
-- 
1.8.3.1