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Commit a8b92ca1 authored by Yishai Hadas's avatar Yishai Hadas Committed by Jason Gunthorpe
Browse files

IB/mlx5: Introduce DEVX 



Introduce DEVX to enable direct device commands in downstream patches
from this series.

In that mode of work the firmware manages the isolation between
processes' resources and as such a DEVX user id is created and assigned
to the given user context upon allocation request.

A capability check is done to make sure that this feature is really
supported by the firmware prior to creating the DEVX user id.

Signed-off-by: default avatarYishai Hadas <yishaih@mellanox.com>
Signed-off-by: default avatarLeon Romanovsky <leonro@mellanox.com>
Signed-off-by: default avatarJason Gunthorpe <jgg@mellanox.com>
parent 7dc08dcf

drivers/infiniband/hw/mlx5/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -3,3 +3,4 @@ obj-$(CONFIG_MLX5_INFINIBAND) += mlx5_ib.o 
mlx5_ib-y :=	main.o cq.o doorbell.o qp.o mem.o srq.o mr.o ah.o mad.o gsi.o ib_virt.o cmd.o cong.o

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

drivers/infiniband/hw/mlx5/devx.c

0 → 100644
+58 −0
Original line number Diff line number Diff line 
// 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"



int mlx5_ib_devx_create(struct mlx5_ib_dev *dev, struct mlx5_ib_ucontext *context)

{

	u32 in[MLX5_ST_SZ_DW(create_uctx_in)] = {0};

	u32 out[MLX5_ST_SZ_DW(general_obj_out_cmd_hdr)] = {0};

	u64 general_obj_types;

	void *uctx;

	void *hdr;

	int err;



	uctx = MLX5_ADDR_OF(create_uctx_in, in, uctx);

	hdr = MLX5_ADDR_OF(create_uctx_in, in, hdr);



	general_obj_types = MLX5_CAP_GEN_64(dev->mdev, general_obj_types);

	if (!(general_obj_types & MLX5_GENERAL_OBJ_TYPES_CAP_UCTX) ||

	    !(general_obj_types & MLX5_GENERAL_OBJ_TYPES_CAP_UMEM))

		return -EINVAL;



	if (!capable(CAP_NET_RAW))

		return -EPERM;



	MLX5_SET(general_obj_in_cmd_hdr, hdr, opcode, MLX5_CMD_OP_CREATE_GENERAL_OBJECT);

	MLX5_SET(general_obj_in_cmd_hdr, hdr, obj_type, MLX5_OBJ_TYPE_UCTX);



	err = mlx5_cmd_exec(dev->mdev, in, sizeof(in), out, sizeof(out));

	if (err)

		return err;



	context->devx_uid = MLX5_GET(general_obj_out_cmd_hdr, out, obj_id);

	return 0;

}



void mlx5_ib_devx_destroy(struct mlx5_ib_dev *dev,

			  struct mlx5_ib_ucontext *context)

{

	u32 in[MLX5_ST_SZ_DW(general_obj_in_cmd_hdr)] = {0};

	u32 out[MLX5_ST_SZ_DW(general_obj_out_cmd_hdr)] = {0};



	MLX5_SET(general_obj_in_cmd_hdr, in, opcode, MLX5_CMD_OP_DESTROY_GENERAL_OBJECT);

	MLX5_SET(general_obj_in_cmd_hdr, in, obj_type, MLX5_OBJ_TYPE_UCTX);

	MLX5_SET(general_obj_in_cmd_hdr, in, obj_id, context->devx_uid);



	mlx5_cmd_exec(dev->mdev, in, sizeof(in), out, sizeof(out));

}

drivers/infiniband/hw/mlx5/main.c

+21 −3
Original line number Diff line number Diff line
@@ -1650,8 +1650,8 @@ static struct ib_ucontext *mlx5_ib_alloc_ucontext(struct ib_device *ibdev, 
	if (err)

		return ERR_PTR(err);



	if (req.flags)

		return ERR_PTR(-EINVAL);

	if (req.flags & ~MLX5_IB_ALLOC_UCTX_DEVX)

		return ERR_PTR(-EOPNOTSUPP);



	if (req.comp_mask || req.reserved0 || req.reserved1 || req.reserved2)

		return ERR_PTR(-EOPNOTSUPP);
@@ -1735,6 +1735,18 @@ static struct ib_ucontext *mlx5_ib_alloc_ucontext(struct ib_device *ibdev, 
			goto out_uars;

	}



	if (req.flags & MLX5_IB_ALLOC_UCTX_DEVX) {

		/* Block DEVX on Infiniband as of SELinux */

		if (mlx5_ib_port_link_layer(ibdev, 1) != IB_LINK_LAYER_ETHERNET) {

			err = -EPERM;

			goto out_td;

		}



		err = mlx5_ib_devx_create(dev, context);

		if (err)

			goto out_td;

	}



	INIT_LIST_HEAD(&context->vma_private_list);

	mutex_init(&context->vma_private_list_mutex);

	INIT_LIST_HEAD(&context->db_page_list);
@@ -1795,7 +1807,7 @@ static struct ib_ucontext *mlx5_ib_alloc_ucontext(struct ib_device *ibdev, 


	err = ib_copy_to_udata(udata, &resp, resp.response_length);

	if (err)

		goto out_td;

		goto out_mdev;



	bfregi->ver = ver;

	bfregi->num_low_latency_bfregs = req.num_low_latency_bfregs;
@@ -1805,6 +1817,9 @@ static struct ib_ucontext *mlx5_ib_alloc_ucontext(struct ib_device *ibdev, 


	return &context->ibucontext;



out_mdev:

	if (req.flags & MLX5_IB_ALLOC_UCTX_DEVX)

		mlx5_ib_devx_destroy(dev, context);

out_td:

	if (MLX5_CAP_GEN(dev->mdev, log_max_transport_domain))

		mlx5_ib_dealloc_transport_domain(dev, context->tdn);
@@ -1830,6 +1845,9 @@ static int mlx5_ib_dealloc_ucontext(struct ib_ucontext *ibcontext) 
	struct mlx5_ib_dev *dev = to_mdev(ibcontext->device);

	struct mlx5_bfreg_info *bfregi;



	if (context->devx_uid)

		mlx5_ib_devx_destroy(dev, context);



	bfregi = &context->bfregi;

	if (MLX5_CAP_GEN(dev->mdev, log_max_transport_domain))

		mlx5_ib_dealloc_transport_domain(dev, context->tdn);

drivers/infiniband/hw/mlx5/mlx5_ib.h

+13 −0
Original line number Diff line number Diff line
@@ -143,6 +143,7 @@ struct mlx5_ib_ucontext { 


	u64			lib_caps;

	DECLARE_BITMAP(dm_pages, MLX5_MAX_MEMIC_PAGES);

	u16			devx_uid;

};



static inline struct mlx5_ib_ucontext *to_mucontext(struct ib_ucontext *ibucontext)
@@ -1215,6 +1216,18 @@ struct mlx5_core_dev *mlx5_ib_get_native_port_mdev(struct mlx5_ib_dev *dev, 
void mlx5_ib_put_native_port_mdev(struct mlx5_ib_dev *dev,

				  u8 port_num);



#if IS_ENABLED(CONFIG_INFINIBAND_USER_ACCESS)

int mlx5_ib_devx_create(struct mlx5_ib_dev *dev,

			struct mlx5_ib_ucontext *context);

void mlx5_ib_devx_destroy(struct mlx5_ib_dev *dev,

			  struct mlx5_ib_ucontext *context);

#else

static inline int

mlx5_ib_devx_create(struct mlx5_ib_dev *dev,

		    struct mlx5_ib_ucontext *context) { return -EOPNOTSUPP; };

static inline void mlx5_ib_devx_destroy(struct mlx5_ib_dev *dev,

					struct mlx5_ib_ucontext *context) {}

#endif

static inline void init_query_mad(struct ib_smp *mad)

{

	mad->base_version  = 1;

include/uapi/rdma/mlx5-abi.h

+3 −0
Original line number Diff line number Diff line
@@ -76,6 +76,9 @@ enum mlx5_lib_caps { 
	MLX5_LIB_CAP_4K_UAR	= (__u64)1 << 0,

};



enum mlx5_ib_alloc_uctx_v2_flags {

	MLX5_IB_ALLOC_UCTX_DEVX	= 1 << 0,

};

struct mlx5_ib_alloc_ucontext_req_v2 {

	__u32	total_num_bfregs;

	__u32	num_low_latency_bfregs;