vdpa/mlx5: Connect mlx5_vdpa to auxiliary bus

Change module registration logic to use auxiliary bus instead of custom
made mlx5 register interface.

Signed-off-by: Leon Romanovsky <leonro@nvidia.com>

drivers/net/ethernet/mellanox/mlx5/core/dev.c

@@ -31,6 +31,7 @@
  */
 
 #include <linux/mlx5/driver.h>
+#include <linux/mlx5/mlx5_ifc_vdpa.h>
 #include "mlx5_core.h"
 
 static LIST_HEAD(intf_list);
@@ -51,10 +52,35 @@ enum {
 	MLX5_INTERFACE_ATTACHED,
 };
 
+static bool is_vnet_supported(struct mlx5_core_dev *dev)
+{
+	if (!IS_ENABLED(CONFIG_MLX5_VDPA_NET))
+		return false;
+
+	if (mlx5_core_is_pf(dev))
+		return false;
+
+	if (!(MLX5_CAP_GEN_64(dev, general_obj_types) &
+	      MLX5_GENERAL_OBJ_TYPES_CAP_VIRTIO_NET_Q))
+		return false;
+
+	if (!(MLX5_CAP_DEV_VDPA_EMULATION(dev, event_mode) &
+	      MLX5_VIRTIO_Q_EVENT_MODE_QP_MODE))
+		return false;
+
+	if (!MLX5_CAP_DEV_VDPA_EMULATION(dev, eth_frame_offload_type))
+		return false;
+
+	return true;
+}
+
 static const struct mlx5_adev_device {
 	const char *suffix;
 	bool (*is_supported)(struct mlx5_core_dev *dev);
-} mlx5_adev_devices[1] = {};
+} mlx5_adev_devices[] = {
+	[MLX5_INTERFACE_PROTOCOL_VDPA] = { .suffix = "vnet",
+					   .is_supported = &is_vnet_supported },
+};
 
 int mlx5_adev_idx_alloc(void)
 {

drivers/vdpa/mlx5/Makefile

@@ -1,4 +1,4 @@
 subdir-ccflags-y += -I$(srctree)/drivers/vdpa/mlx5/core
 
 obj-$(CONFIG_MLX5_VDPA_NET) += mlx5_vdpa.o
-mlx5_vdpa-$(CONFIG_MLX5_VDPA_NET) += net/main.o net/mlx5_vnet.o core/resources.o core/mr.o
+mlx5_vdpa-$(CONFIG_MLX5_VDPA_NET) += net/mlx5_vnet.o core/resources.o core/mr.o

drivers/vdpa/mlx5/net/mlx5_vnet.c

@@ -1,18 +1,28 @@
 // SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
 /* Copyright (c) 2020 Mellanox Technologies Ltd. */
 
+#include <linux/module.h>
 #include <linux/vdpa.h>
+#include <linux/vringh.h>
+#include <uapi/linux/virtio_net.h>
 #include <uapi/linux/virtio_ids.h>
 #include <linux/virtio_config.h>
+#include <linux/auxiliary_bus.h>
+#include <linux/mlx5/cq.h>
 #include <linux/mlx5/qp.h>
 #include <linux/mlx5/device.h>
+#include <linux/mlx5/driver.h>
 #include <linux/mlx5/vport.h>
 #include <linux/mlx5/fs.h>
-#include <linux/mlx5/device.h>
 #include <linux/mlx5/mlx5_ifc_vdpa.h>
-#include "mlx5_vnet.h"
 #include "mlx5_vdpa.h"
 
+MODULE_AUTHOR("Eli Cohen <eli@mellanox.com>");
+MODULE_DESCRIPTION("Mellanox VDPA driver");
+MODULE_LICENSE("Dual BSD/GPL");
+
+#define to_mlx5_vdpa_ndev(__mvdev)                                             \
+	container_of(__mvdev, struct mlx5_vdpa_net, mvdev)
 #define to_mvdev(__vdev) container_of((__vdev), struct mlx5_vdpa_dev, vdev)
 
 #define VALID_FEATURES_MASK                                                                        \
@@ -159,6 +169,11 @@ static bool mlx5_vdpa_debug;
 			mlx5_vdpa_info(mvdev, "%s\n", #_status);                                   \
 	} while (0)
 
+static inline u32 mlx5_vdpa_max_qps(int max_vqs)
+{
+	return max_vqs / 2;
+}
+
 static void print_status(struct mlx5_vdpa_dev *mvdev, u8 status, bool set)
 {
 	if (status & ~VALID_STATUS_MASK)
@@ -1928,8 +1943,11 @@ static void init_mvqs(struct mlx5_vdpa_net *ndev)
 	}
 }
 
-void *mlx5_vdpa_add_dev(struct mlx5_core_dev *mdev)
+static int mlx5v_probe(struct auxiliary_device *adev,
+		       const struct auxiliary_device_id *id)
 {
+	struct mlx5_adev *madev = container_of(adev, struct mlx5_adev, adev);
+	struct mlx5_core_dev *mdev = madev->mdev;
 	struct virtio_net_config *config;
 	struct mlx5_vdpa_dev *mvdev;
 	struct mlx5_vdpa_net *ndev;
@@ -1943,7 +1961,7 @@ void *mlx5_vdpa_add_dev(struct mlx5_core_dev *mdev)
 	ndev = vdpa_alloc_device(struct mlx5_vdpa_net, mvdev.vdev, mdev->device, &mlx5_vdpa_ops,
 				 2 * mlx5_vdpa_max_qps(max_vqs));
 	if (IS_ERR(ndev))
-		return ndev;
+		return PTR_ERR(ndev);
 
 	ndev->mvdev.max_vqs = max_vqs;
 	mvdev = &ndev->mvdev;
@@ -1972,7 +1990,8 @@ void *mlx5_vdpa_add_dev(struct mlx5_core_dev *mdev)
 	if (err)
 		goto err_reg;
 
-	return ndev;
+	dev_set_drvdata(&adev->dev, ndev);
+	return 0;
 
 err_reg:
 	free_resources(ndev);
@@ -1981,10 +2000,28 @@ void *mlx5_vdpa_add_dev(struct mlx5_core_dev *mdev)
 err_mtu:
 	mutex_destroy(&ndev->reslock);
 	put_device(&mvdev->vdev.dev);
-	return ERR_PTR(err);
+	return err;
 }
 
-void mlx5_vdpa_remove_dev(struct mlx5_vdpa_dev *mvdev)
+static void mlx5v_remove(struct auxiliary_device *adev)
 {
+	struct mlx5_vdpa_dev *mvdev = dev_get_drvdata(&adev->dev);
+
 	vdpa_unregister_device(&mvdev->vdev);
 }
+
+static const struct auxiliary_device_id mlx5v_id_table[] = {
+	{ .name = MLX5_ADEV_NAME ".vnet", },
+	{},
+};
+
+MODULE_DEVICE_TABLE(auxiliary, mlx5v_id_table);
+
+static struct auxiliary_driver mlx5v_driver = {
+	.name = "vnet",
+	.probe = mlx5v_probe,
+	.remove = mlx5v_remove,
+	.id_table = mlx5v_id_table,
+};
+
+module_auxiliary_driver(mlx5v_driver);