IB/mlx5: Introduce flow steering matcher uapi object

Introduce flow steering matcher object and its create and destroy methods.

This matcher object holds some mlx5 specific driver properties that
matches the underlay device specification when an mlx5 flow steering group
is created.

It will be used in downstream patches to be part of mlx5 specific create
flow method.

Signed-off-by: Yishai Hadas <yishaih@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

drivers/infiniband/core/uverbs_std_types_flow_action.c

@@ -376,8 +376,7 @@ static const struct uverbs_attr_spec uverbs_flow_action_esp_keymat[] = {
 static const struct uverbs_attr_spec uverbs_flow_action_esp_replay[] = {
 	[IB_UVERBS_FLOW_ACTION_ESP_REPLAY_NONE] = {
 		.type = UVERBS_ATTR_TYPE_PTR_IN,
-		/* No need to specify any data */
+		UVERBS_ATTR_NO_DATA(),
-		UVERBS_ATTR_SIZE(0, 0),
 	},
 	[IB_UVERBS_FLOW_ACTION_ESP_REPLAY_BMP] = {
 		.type = UVERBS_ATTR_TYPE_PTR_IN,

drivers/infiniband/hw/mlx5/Makefile

@@ -4,3 +4,4 @@ mlx5_ib-y :=	main.o cq.o doorbell.o qp.o mem.o srq.o mr.o ah.o mad.o gsi.o ib_vi
 mlx5_ib-$(CONFIG_INFINIBAND_ON_DEMAND_PAGING) += odp.o
 mlx5_ib-$(CONFIG_MLX5_ESWITCH) += ib_rep.o
 mlx5_ib-$(CONFIG_INFINIBAND_USER_ACCESS) += devx.o
+mlx5_ib-$(CONFIG_INFINIBAND_USER_ACCESS) += flow.o

drivers/infiniband/hw/mlx5/flow.c

@@ -0,0 +1,134 @@
+// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
+/*
+ * Copyright (c) 2018, Mellanox Technologies inc.  All rights reserved.
+ */
+
+#include <rdma/ib_user_verbs.h>
+#include <rdma/ib_verbs.h>
+#include <rdma/uverbs_types.h>
+#include <rdma/uverbs_ioctl.h>
+#include <rdma/mlx5_user_ioctl_cmds.h>
+#include <rdma/ib_umem.h>
+#include <linux/mlx5/driver.h>
+#include <linux/mlx5/fs.h>
+#include "mlx5_ib.h"
+
+#define UVERBS_MODULE_NAME mlx5_ib
+#include <rdma/uverbs_named_ioctl.h>
+
+static const struct uverbs_attr_spec mlx5_ib_flow_type[] = {
+	[MLX5_IB_FLOW_TYPE_NORMAL] = {
+		.type = UVERBS_ATTR_TYPE_PTR_IN,
+		.u.ptr = {
+			.len = sizeof(u16), /* data is priority */
+			.min_len = sizeof(u16),
+		}
+	},
+	[MLX5_IB_FLOW_TYPE_SNIFFER] = {
+		.type = UVERBS_ATTR_TYPE_PTR_IN,
+		UVERBS_ATTR_NO_DATA(),
+	},
+	[MLX5_IB_FLOW_TYPE_ALL_DEFAULT] = {
+		.type = UVERBS_ATTR_TYPE_PTR_IN,
+		UVERBS_ATTR_NO_DATA(),
+	},
+	[MLX5_IB_FLOW_TYPE_MC_DEFAULT] = {
+		.type = UVERBS_ATTR_TYPE_PTR_IN,
+		UVERBS_ATTR_NO_DATA(),
+	},
+};
+
+static int flow_matcher_cleanup(struct ib_uobject *uobject,
+				enum rdma_remove_reason why)
+{
+	struct mlx5_ib_flow_matcher *obj = uobject->object;
+	int ret;
+
+	ret = ib_destroy_usecnt(&obj->usecnt, why, uobject);
+	if (ret)
+		return ret;
+
+	kfree(obj);
+	return 0;
+}
+
+static int UVERBS_HANDLER(MLX5_IB_METHOD_FLOW_MATCHER_CREATE)(
+	struct ib_device *ib_dev, struct ib_uverbs_file *file,
+	struct uverbs_attr_bundle *attrs)
+{
+	struct ib_uobject *uobj = uverbs_attr_get_uobject(
+		attrs, MLX5_IB_ATTR_FLOW_MATCHER_CREATE_HANDLE);
+	struct mlx5_ib_dev *dev = to_mdev(uobj->context->device);
+	struct mlx5_ib_flow_matcher *obj;
+	int err;
+
+	obj = kzalloc(sizeof(struct mlx5_ib_flow_matcher), GFP_KERNEL);
+	if (!obj)
+		return -ENOMEM;
+
+	obj->mask_len = uverbs_attr_get_len(
+		attrs, MLX5_IB_ATTR_FLOW_MATCHER_MATCH_MASK);
+	err = uverbs_copy_from(&obj->matcher_mask,
+			       attrs,
+			       MLX5_IB_ATTR_FLOW_MATCHER_MATCH_MASK);
+	if (err)
+		goto end;
+
+	obj->flow_type = uverbs_attr_get_enum_id(
+		attrs, MLX5_IB_ATTR_FLOW_MATCHER_FLOW_TYPE);
+
+	if (obj->flow_type == MLX5_IB_FLOW_TYPE_NORMAL) {
+		err = uverbs_copy_from(&obj->priority,
+				       attrs,
+				       MLX5_IB_ATTR_FLOW_MATCHER_FLOW_TYPE);
+		if (err)
+			goto end;
+	}
+
+	err = uverbs_copy_from(&obj->match_criteria_enable,
+			       attrs,
+			       MLX5_IB_ATTR_FLOW_MATCHER_MATCH_CRITERIA);
+	if (err)
+		goto end;
+
+	uobj->object = obj;
+	obj->mdev = dev->mdev;
+	atomic_set(&obj->usecnt, 0);
+	return 0;
+
+end:
+	kfree(obj);
+	return err;
+}
+
+DECLARE_UVERBS_NAMED_METHOD(
+	MLX5_IB_METHOD_FLOW_MATCHER_CREATE,
+	UVERBS_ATTR_IDR(MLX5_IB_ATTR_FLOW_MATCHER_CREATE_HANDLE,
+			MLX5_IB_OBJECT_FLOW_MATCHER,
+			UVERBS_ACCESS_NEW,
+			UA_MANDATORY),
+	UVERBS_ATTR_PTR_IN(
+		MLX5_IB_ATTR_FLOW_MATCHER_MATCH_MASK,
+		UVERBS_ATTR_SIZE(1, sizeof(struct mlx5_ib_match_params)),
+		UA_MANDATORY),
+	UVERBS_ATTR_ENUM_IN(MLX5_IB_ATTR_FLOW_MATCHER_FLOW_TYPE,
+			    mlx5_ib_flow_type,
+			    UA_MANDATORY),
+	UVERBS_ATTR_PTR_IN(MLX5_IB_ATTR_FLOW_MATCHER_MATCH_CRITERIA,
+			   UVERBS_ATTR_TYPE(u8),
+			   UA_MANDATORY));
+
+DECLARE_UVERBS_NAMED_METHOD_DESTROY(
+	MLX5_IB_METHOD_FLOW_MATCHER_DESTROY,
+	UVERBS_ATTR_IDR(MLX5_IB_ATTR_FLOW_MATCHER_DESTROY_HANDLE,
+			MLX5_IB_OBJECT_FLOW_MATCHER,
+			UVERBS_ACCESS_DESTROY,
+			UA_MANDATORY));
+
+DECLARE_UVERBS_NAMED_OBJECT(MLX5_IB_OBJECT_FLOW_MATCHER,
+			    UVERBS_TYPE_ALLOC_IDR(flow_matcher_cleanup),
+			    &UVERBS_METHOD(MLX5_IB_METHOD_FLOW_MATCHER_CREATE),
+			    &UVERBS_METHOD(MLX5_IB_METHOD_FLOW_MATCHER_DESTROY));
+
+DECLARE_UVERBS_OBJECT_TREE(flow_objects,
+			   &UVERBS_OBJECT(MLX5_IB_OBJECT_FLOW_MATCHER));

drivers/infiniband/hw/mlx5/mlx5_ib.h

@@ -46,6 +46,7 @@
 #include <rdma/ib_user_verbs.h>
 #include <rdma/mlx5-abi.h>
 #include <rdma/uverbs_ioctl.h>
+#include <rdma/mlx5_user_ioctl_cmds.h>
 
 #define mlx5_ib_dbg(dev, format, arg...)				\
 pr_debug("%s:%s:%d:(pid %d): " format, (dev)->ib_dev.name, __func__,	\
@@ -173,6 +174,16 @@ struct mlx5_ib_flow_handler {
 	struct ib_counters		*ibcounters;
 };
 
+struct mlx5_ib_flow_matcher {
+	struct mlx5_ib_match_params matcher_mask;
+	int			mask_len;
+	enum mlx5_ib_flow_type	flow_type;
+	u16			priority;
+	struct mlx5_core_dev	*mdev;
+	atomic_t		usecnt;
+	u8			match_criteria_enable;
+};
+
 struct mlx5_ib_flow_db {
 	struct mlx5_ib_flow_prio	prios[MLX5_IB_NUM_FLOW_FT];
 	struct mlx5_ib_flow_prio	sniffer[MLX5_IB_NUM_SNIFFER_FTS];

include/rdma/uverbs_ioctl.h

@@ -204,6 +204,8 @@ struct uverbs_object_tree_def {
 #define UVERBS_ATTR_SIZE(_min_len, _len)			\
 	.u.ptr.min_len = _min_len, .u.ptr.len = _len
 
+#define UVERBS_ATTR_NO_DATA() UVERBS_ATTR_SIZE(0, 0)
+
 /*
  * Specifies a uapi structure that cannot be extended. The user must always
  * supply the whole structure and nothing more. The structure must be declared

include/uapi/rdma/mlx5_user_ioctl_cmds.h

@@ -33,6 +33,7 @@
 #ifndef MLX5_USER_IOCTL_CMDS_H
 #define MLX5_USER_IOCTL_CMDS_H
 
+#include <linux/types.h>
 #include <rdma/ib_user_ioctl_cmds.h>
 
 enum mlx5_ib_create_flow_action_attrs {
@@ -112,10 +113,40 @@ enum mlx5_ib_devx_umem_methods {
 	MLX5_IB_METHOD_DEVX_UMEM_DEREG,
 };
 
-enum mlx5_ib_devx_objects {
+enum mlx5_ib_objects {
 	MLX5_IB_OBJECT_DEVX = (1U << UVERBS_ID_NS_SHIFT),
 	MLX5_IB_OBJECT_DEVX_OBJ,
 	MLX5_IB_OBJECT_DEVX_UMEM,
+	MLX5_IB_OBJECT_FLOW_MATCHER,
+};
+
+enum mlx5_ib_flow_matcher_create_attrs {
+	MLX5_IB_ATTR_FLOW_MATCHER_CREATE_HANDLE = (1U << UVERBS_ID_NS_SHIFT),
+	MLX5_IB_ATTR_FLOW_MATCHER_MATCH_MASK,
+	MLX5_IB_ATTR_FLOW_MATCHER_FLOW_TYPE,
+	MLX5_IB_ATTR_FLOW_MATCHER_MATCH_CRITERIA,
+};
+
+enum mlx5_ib_flow_matcher_destroy_attrs {
+	MLX5_IB_ATTR_FLOW_MATCHER_DESTROY_HANDLE = (1U << UVERBS_ID_NS_SHIFT),
+};
+
+enum mlx5_ib_flow_matcher_methods {
+	MLX5_IB_METHOD_FLOW_MATCHER_CREATE = (1U << UVERBS_ID_NS_SHIFT),
+	MLX5_IB_METHOD_FLOW_MATCHER_DESTROY,
+};
+
+#define MLX5_IB_DW_MATCH_PARAM 0x80
+
+struct mlx5_ib_match_params {
+	__u32	match_params[MLX5_IB_DW_MATCH_PARAM];
+};
+
+enum mlx5_ib_flow_type {
+	MLX5_IB_FLOW_TYPE_NORMAL,
+	MLX5_IB_FLOW_TYPE_SNIFFER,
+	MLX5_IB_FLOW_TYPE_ALL_DEFAULT,
+	MLX5_IB_FLOW_TYPE_MC_DEFAULT,
 };
 
 #endif