1a86b377aa
Add a front end VDPA driver that registers in the VDPA bus and provides networking to a guest. The VDPA driver creates the necessary resources on the VF it is driving such that data path will be offloaded. Notifications are being communicated through the driver. Currently, only VFs are supported. In subsequent patches we will have devlink support to control which VF is used for VDPA and which function is used for regular networking. Reviewed-by: Parav Pandit <parav@mellanox.com> Signed-off-by: Eli Cohen <eli@mellanox.com> Link: https://lore.kernel.org/r/20200804162048.22587-13-eli@mellanox.com Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Acked-by: Jason Wang <jasowang@redhat.com>
76 lines
1.7 KiB
C
76 lines
1.7 KiB
C
// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
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/* Copyright (c) 2020 Mellanox Technologies Ltd. */
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#include <linux/module.h>
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#include <linux/mlx5/driver.h>
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#include <linux/mlx5/device.h>
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#include "mlx5_vdpa_ifc.h"
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#include "mlx5_vnet.h"
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MODULE_AUTHOR("Eli Cohen <eli@mellanox.com>");
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MODULE_DESCRIPTION("Mellanox VDPA driver");
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MODULE_LICENSE("Dual BSD/GPL");
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static bool required_caps_supported(struct mlx5_core_dev *mdev)
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{
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u8 event_mode;
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u64 got;
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got = MLX5_CAP_GEN_64(mdev, general_obj_types);
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if (!(got & MLX5_GENERAL_OBJ_TYPES_CAP_VIRTIO_NET_Q))
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return false;
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event_mode = MLX5_CAP_DEV_VDPA_EMULATION(mdev, event_mode);
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if (!(event_mode & MLX5_VIRTIO_Q_EVENT_MODE_QP_MODE))
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return false;
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if (!MLX5_CAP_DEV_VDPA_EMULATION(mdev, eth_frame_offload_type))
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return false;
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return true;
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}
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static void *mlx5_vdpa_add(struct mlx5_core_dev *mdev)
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{
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struct mlx5_vdpa_dev *vdev;
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if (mlx5_core_is_pf(mdev))
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return NULL;
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if (!required_caps_supported(mdev)) {
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dev_info(mdev->device, "virtio net emulation not supported\n");
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return NULL;
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}
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vdev = mlx5_vdpa_add_dev(mdev);
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if (IS_ERR(vdev))
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return NULL;
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return vdev;
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}
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static void mlx5_vdpa_remove(struct mlx5_core_dev *mdev, void *context)
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{
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struct mlx5_vdpa_dev *vdev = context;
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mlx5_vdpa_remove_dev(vdev);
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}
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static struct mlx5_interface mlx5_vdpa_interface = {
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.add = mlx5_vdpa_add,
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.remove = mlx5_vdpa_remove,
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.protocol = MLX5_INTERFACE_PROTOCOL_VDPA,
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};
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static int __init mlx5_vdpa_init(void)
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{
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return mlx5_register_interface(&mlx5_vdpa_interface);
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}
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static void __exit mlx5_vdpa_exit(void)
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{
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mlx5_unregister_interface(&mlx5_vdpa_interface);
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}
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module_init(mlx5_vdpa_init);
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module_exit(mlx5_vdpa_exit);
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