vdpa/mlx5: Add support library for mlx5 VDPA implementation
Following patches introduce VDPA network driver for Mellanox Connectx6 devices. This patch provides functionality that will be used by those patches. Reviewed-by: Parav Pandit <parav@mellanox.com> Signed-off-by: Eli Cohen <eli@mellanox.com> Link: https://lore.kernel.org/r/20200804162048.22587-11-eli@mellanox.com Signed-off-by: Michael S. Tsirkin <mst@redhat.com>zero-sugar-mainline-defconfig
Eli Cohen
Michael S. Tsirkin
parent
89349be659
commit
29064bfdab
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@ -28,4 +28,13 @@ config IFCVF
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To compile this driver as a module, choose M here: the module will
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be called ifcvf.
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config MLX5_VDPA
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bool "MLX5 VDPA support library for ConnectX devices"
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depends on MLX5_CORE
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default n
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help
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Support library for Mellanox VDPA drivers. Provides code that is
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common for all types of VDPA drivers. The following drivers are planned:
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net, block.
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endif # VDPA
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@ -2,3 +2,4 @@
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obj-$(CONFIG_VDPA) += vdpa.o
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obj-$(CONFIG_VDPA_SIM) += vdpa_sim/
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obj-$(CONFIG_IFCVF) += ifcvf/
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obj-$(CONFIG_MLX5_VDPA) += mlx5/
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@ -0,0 +1 @@
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obj-$(CONFIG_MLX5_VDPA) += core/resources.o
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@ -0,0 +1 @@
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obj-y += resources.o
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@ -0,0 +1,57 @@
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/* SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB */
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/* Copyright (c) 2020 Mellanox Technologies Ltd. */
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#ifndef __MLX5_VDPA_H__
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#define __MLX5_VDPA_H__
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#include <linux/vdpa.h>
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#include <linux/mlx5/driver.h>
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struct mlx5_vdpa_resources {
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u32 pdn;
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struct mlx5_uars_page *uar;
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void __iomem *kick_addr;
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u16 uid;
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u32 null_mkey;
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bool valid;
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};
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struct mlx5_vdpa_dev {
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struct vdpa_device vdev;
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struct mlx5_core_dev *mdev;
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struct mlx5_vdpa_resources res;
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u64 mlx_features;
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u64 actual_features;
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u8 status;
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u32 max_vqs;
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u32 generation;
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};
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int mlx5_vdpa_alloc_pd(struct mlx5_vdpa_dev *dev, u32 *pdn, u16 uid);
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int mlx5_vdpa_dealloc_pd(struct mlx5_vdpa_dev *dev, u32 pdn, u16 uid);
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int mlx5_vdpa_get_null_mkey(struct mlx5_vdpa_dev *dev, u32 *null_mkey);
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int mlx5_vdpa_create_tis(struct mlx5_vdpa_dev *mvdev, void *in, u32 *tisn);
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void mlx5_vdpa_destroy_tis(struct mlx5_vdpa_dev *mvdev, u32 tisn);
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int mlx5_vdpa_create_rqt(struct mlx5_vdpa_dev *mvdev, void *in, int inlen, u32 *rqtn);
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void mlx5_vdpa_destroy_rqt(struct mlx5_vdpa_dev *mvdev, u32 rqtn);
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int mlx5_vdpa_create_tir(struct mlx5_vdpa_dev *mvdev, void *in, u32 *tirn);
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void mlx5_vdpa_destroy_tir(struct mlx5_vdpa_dev *mvdev, u32 tirn);
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int mlx5_vdpa_alloc_transport_domain(struct mlx5_vdpa_dev *mvdev, u32 *tdn);
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void mlx5_vdpa_dealloc_transport_domain(struct mlx5_vdpa_dev *mvdev, u32 tdn);
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int mlx5_vdpa_alloc_resources(struct mlx5_vdpa_dev *mvdev);
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void mlx5_vdpa_free_resources(struct mlx5_vdpa_dev *mvdev);
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#define mlx5_vdpa_warn(__dev, format, ...) \
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dev_warn((__dev)->mdev->device, "%s:%d:(pid %d) warning: " format, __func__, __LINE__, \
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current->pid, ##__VA_ARGS__)
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#define mlx5_vdpa_info(__dev, format, ...) \
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dev_info((__dev)->mdev->device, "%s:%d:(pid %d): " format, __func__, __LINE__, \
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current->pid, ##__VA_ARGS__)
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#define mlx5_vdpa_dbg(__dev, format, ...) \
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dev_debug((__dev)->mdev->device, "%s:%d:(pid %d): " format, __func__, __LINE__, \
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current->pid, ##__VA_ARGS__)
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#endif /* __MLX5_VDPA_H__ */
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@ -0,0 +1,281 @@
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// 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/mlx5/driver.h>
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#include "mlx5_vdpa.h"
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static int alloc_pd(struct mlx5_vdpa_dev *dev, u32 *pdn, u16 uid)
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{
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struct mlx5_core_dev *mdev = dev->mdev;
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u32 out[MLX5_ST_SZ_DW(alloc_pd_out)] = {};
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u32 in[MLX5_ST_SZ_DW(alloc_pd_in)] = {};
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int err;
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MLX5_SET(alloc_pd_in, in, opcode, MLX5_CMD_OP_ALLOC_PD);
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MLX5_SET(alloc_pd_in, in, uid, uid);
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err = mlx5_cmd_exec_inout(mdev, alloc_pd, in, out);
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if (!err)
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*pdn = MLX5_GET(alloc_pd_out, out, pd);
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return err;
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}
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static int dealloc_pd(struct mlx5_vdpa_dev *dev, u32 pdn, u16 uid)
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{
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u32 in[MLX5_ST_SZ_DW(dealloc_pd_in)] = {};
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struct mlx5_core_dev *mdev = dev->mdev;
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MLX5_SET(dealloc_pd_in, in, opcode, MLX5_CMD_OP_DEALLOC_PD);
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MLX5_SET(dealloc_pd_in, in, pd, pdn);
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MLX5_SET(dealloc_pd_in, in, uid, uid);
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return mlx5_cmd_exec_in(mdev, dealloc_pd, in);
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}
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static int get_null_mkey(struct mlx5_vdpa_dev *dev, u32 *null_mkey)
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{
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u32 out[MLX5_ST_SZ_DW(query_special_contexts_out)] = {};
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u32 in[MLX5_ST_SZ_DW(query_special_contexts_in)] = {};
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struct mlx5_core_dev *mdev = dev->mdev;
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int err;
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MLX5_SET(query_special_contexts_in, in, opcode, MLX5_CMD_OP_QUERY_SPECIAL_CONTEXTS);
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err = mlx5_cmd_exec_inout(mdev, query_special_contexts, in, out);
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if (!err)
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*null_mkey = MLX5_GET(query_special_contexts_out, out, null_mkey);
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return err;
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}
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static int create_uctx(struct mlx5_vdpa_dev *mvdev, u16 *uid)
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{
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u32 out[MLX5_ST_SZ_DW(create_uctx_out)] = {};
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int inlen;
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void *in;
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int err;
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/* 0 means not supported */
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if (!MLX5_CAP_GEN(mvdev->mdev, log_max_uctx))
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return -EOPNOTSUPP;
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inlen = MLX5_ST_SZ_BYTES(create_uctx_in);
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in = kzalloc(inlen, GFP_KERNEL);
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if (!in)
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return -ENOMEM;
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MLX5_SET(create_uctx_in, in, opcode, MLX5_CMD_OP_CREATE_UCTX);
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MLX5_SET(create_uctx_in, in, uctx.cap, MLX5_UCTX_CAP_RAW_TX);
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err = mlx5_cmd_exec(mvdev->mdev, in, inlen, out, sizeof(out));
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kfree(in);
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if (!err)
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*uid = MLX5_GET(create_uctx_out, out, uid);
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return err;
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}
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static void destroy_uctx(struct mlx5_vdpa_dev *mvdev, u32 uid)
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{
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u32 out[MLX5_ST_SZ_DW(destroy_uctx_out)] = {};
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u32 in[MLX5_ST_SZ_DW(destroy_uctx_in)] = {};
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MLX5_SET(destroy_uctx_in, in, opcode, MLX5_CMD_OP_DESTROY_UCTX);
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MLX5_SET(destroy_uctx_in, in, uid, uid);
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mlx5_cmd_exec(mvdev->mdev, in, sizeof(in), out, sizeof(out));
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}
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int mlx5_vdpa_create_tis(struct mlx5_vdpa_dev *mvdev, void *in, u32 *tisn)
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{
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u32 out[MLX5_ST_SZ_DW(create_tis_out)] = {};
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int err;
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MLX5_SET(create_tis_in, in, opcode, MLX5_CMD_OP_CREATE_TIS);
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MLX5_SET(create_tis_in, in, uid, mvdev->res.uid);
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err = mlx5_cmd_exec_inout(mvdev->mdev, create_tis, in, out);
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if (!err)
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*tisn = MLX5_GET(create_tis_out, out, tisn);
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return err;
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}
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void mlx5_vdpa_destroy_tis(struct mlx5_vdpa_dev *mvdev, u32 tisn)
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{
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u32 in[MLX5_ST_SZ_DW(destroy_tis_in)] = {};
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MLX5_SET(destroy_tis_in, in, opcode, MLX5_CMD_OP_DESTROY_TIS);
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MLX5_SET(destroy_tis_in, in, uid, mvdev->res.uid);
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MLX5_SET(destroy_tis_in, in, tisn, tisn);
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mlx5_cmd_exec_in(mvdev->mdev, destroy_tis, in);
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}
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int mlx5_vdpa_create_rqt(struct mlx5_vdpa_dev *mvdev, void *in, int inlen, u32 *rqtn)
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{
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u32 out[MLX5_ST_SZ_DW(create_rqt_out)] = {};
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int err;
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MLX5_SET(create_rqt_in, in, opcode, MLX5_CMD_OP_CREATE_RQT);
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err = mlx5_cmd_exec(mvdev->mdev, in, inlen, out, sizeof(out));
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if (!err)
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*rqtn = MLX5_GET(create_rqt_out, out, rqtn);
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return err;
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}
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void mlx5_vdpa_destroy_rqt(struct mlx5_vdpa_dev *mvdev, u32 rqtn)
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{
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u32 in[MLX5_ST_SZ_DW(destroy_rqt_in)] = {};
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MLX5_SET(destroy_rqt_in, in, opcode, MLX5_CMD_OP_DESTROY_RQT);
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MLX5_SET(destroy_rqt_in, in, uid, mvdev->res.uid);
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MLX5_SET(destroy_rqt_in, in, rqtn, rqtn);
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mlx5_cmd_exec_in(mvdev->mdev, destroy_rqt, in);
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}
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int mlx5_vdpa_create_tir(struct mlx5_vdpa_dev *mvdev, void *in, u32 *tirn)
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{
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u32 out[MLX5_ST_SZ_DW(create_tir_out)] = {};
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int err;
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MLX5_SET(create_tir_in, in, opcode, MLX5_CMD_OP_CREATE_TIR);
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err = mlx5_cmd_exec_inout(mvdev->mdev, create_tir, in, out);
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if (!err)
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*tirn = MLX5_GET(create_tir_out, out, tirn);
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return err;
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}
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void mlx5_vdpa_destroy_tir(struct mlx5_vdpa_dev *mvdev, u32 tirn)
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{
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u32 in[MLX5_ST_SZ_DW(destroy_tir_in)] = {};
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MLX5_SET(destroy_tir_in, in, opcode, MLX5_CMD_OP_DESTROY_TIR);
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MLX5_SET(destroy_tir_in, in, uid, mvdev->res.uid);
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MLX5_SET(destroy_tir_in, in, tirn, tirn);
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mlx5_cmd_exec_in(mvdev->mdev, destroy_tir, in);
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}
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int mlx5_vdpa_alloc_transport_domain(struct mlx5_vdpa_dev *mvdev, u32 *tdn)
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{
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u32 out[MLX5_ST_SZ_DW(alloc_transport_domain_out)] = {};
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u32 in[MLX5_ST_SZ_DW(alloc_transport_domain_in)] = {};
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int err;
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MLX5_SET(alloc_transport_domain_in, in, opcode, MLX5_CMD_OP_ALLOC_TRANSPORT_DOMAIN);
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MLX5_SET(alloc_transport_domain_in, in, uid, mvdev->res.uid);
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err = mlx5_cmd_exec_inout(mvdev->mdev, alloc_transport_domain, in, out);
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if (!err)
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*tdn = MLX5_GET(alloc_transport_domain_out, out, transport_domain);
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return err;
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}
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void mlx5_vdpa_dealloc_transport_domain(struct mlx5_vdpa_dev *mvdev, u32 tdn)
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{
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u32 in[MLX5_ST_SZ_DW(dealloc_transport_domain_in)] = {};
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MLX5_SET(dealloc_transport_domain_in, in, opcode, MLX5_CMD_OP_DEALLOC_TRANSPORT_DOMAIN);
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MLX5_SET(dealloc_transport_domain_in, in, uid, mvdev->res.uid);
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MLX5_SET(dealloc_transport_domain_in, in, transport_domain, tdn);
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mlx5_cmd_exec_in(mvdev->mdev, dealloc_transport_domain, in);
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}
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int mlx5_vdpa_create_mkey(struct mlx5_vdpa_dev *mvdev, struct mlx5_core_mkey *mkey, u32 *in,
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int inlen)
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{
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u32 lout[MLX5_ST_SZ_DW(create_mkey_out)] = {};
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u32 mkey_index;
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void *mkc;
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int err;
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MLX5_SET(create_mkey_in, in, opcode, MLX5_CMD_OP_CREATE_MKEY);
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MLX5_SET(create_mkey_in, in, uid, mvdev->res.uid);
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err = mlx5_cmd_exec(mvdev->mdev, in, inlen, lout, sizeof(lout));
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if (err)
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return err;
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mkc = MLX5_ADDR_OF(create_mkey_in, in, memory_key_mkey_entry);
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mkey_index = MLX5_GET(create_mkey_out, lout, mkey_index);
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mkey->iova = MLX5_GET64(mkc, mkc, start_addr);
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mkey->size = MLX5_GET64(mkc, mkc, len);
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mkey->key |= mlx5_idx_to_mkey(mkey_index);
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mkey->pd = MLX5_GET(mkc, mkc, pd);
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return 0;
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}
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int mlx5_vdpa_destroy_mkey(struct mlx5_vdpa_dev *mvdev, struct mlx5_core_mkey *mkey)
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{
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u32 in[MLX5_ST_SZ_DW(destroy_mkey_in)] = {};
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MLX5_SET(destroy_mkey_in, in, uid, mvdev->res.uid);
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MLX5_SET(destroy_mkey_in, in, opcode, MLX5_CMD_OP_DESTROY_MKEY);
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MLX5_SET(destroy_mkey_in, in, mkey_index, mlx5_mkey_to_idx(mkey->key));
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return mlx5_cmd_exec_in(mvdev->mdev, destroy_mkey, in);
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}
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int mlx5_vdpa_alloc_resources(struct mlx5_vdpa_dev *mvdev)
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{
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u64 offset = MLX5_CAP64_DEV_VDPA_EMULATION(mvdev->mdev, doorbell_bar_offset);
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struct mlx5_vdpa_resources *res = &mvdev->res;
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struct mlx5_core_dev *mdev = mvdev->mdev;
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u64 kick_addr;
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int err;
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if (res->valid) {
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mlx5_vdpa_warn(mvdev, "resources already allocated\n");
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return -EINVAL;
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}
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res->uar = mlx5_get_uars_page(mdev);
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if (IS_ERR(res->uar)) {
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err = PTR_ERR(res->uar);
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goto err_uars;
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}
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err = create_uctx(mvdev, &res->uid);
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if (err)
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goto err_uctx;
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err = alloc_pd(mvdev, &res->pdn, res->uid);
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if (err)
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goto err_pd;
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err = get_null_mkey(mvdev, &res->null_mkey);
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if (err)
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goto err_key;
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kick_addr = pci_resource_start(mdev->pdev, 0) + offset;
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res->kick_addr = ioremap(kick_addr, PAGE_SIZE);
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if (!res->kick_addr) {
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err = -ENOMEM;
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goto err_key;
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}
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res->valid = true;
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return 0;
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err_key:
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dealloc_pd(mvdev, res->pdn, res->uid);
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err_pd:
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destroy_uctx(mvdev, res->uid);
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err_uctx:
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mlx5_put_uars_page(mdev, res->uar);
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err_uars:
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return err;
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}
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void mlx5_vdpa_free_resources(struct mlx5_vdpa_dev *mvdev)
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{
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struct mlx5_vdpa_resources *res = &mvdev->res;
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if (!res->valid)
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return;
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iounmap(res->kick_addr);
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res->kick_addr = NULL;
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dealloc_pd(mvdev, res->pdn, res->uid);
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destroy_uctx(mvdev, res->uid);
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mlx5_put_uars_page(mvdev->mdev, res->uar);
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res->valid = false;
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}
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