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Commit 537a5057 authored by Ilan Tayari's avatar Ilan Tayari Committed by Saeed Mahameed
Browse files

net/mlx5: FPGA, Add high-speed connection routines 



An FPGA high-speed connection has two endpoints, an FPGA QP and a
ConnectX QP.
Add library routines to create and connect the endpoints of an
FPGA high-speed connection.

These routines allow creating and interacting with both types of
connections: Shell and Sandbox Unit (SBU).

Shell connection provides an interface to the FPGA's address space,
which includes the configuration space and the DDR.
Use of the shell connection will be introduced in a later patchset.

SBU connection provides a command and/or data interface to the
application-specific logic within the FPGA.
Use of the SBU connection will be introduced in a later patch in
this patchset.

Some struct definitions are added to a new header file sdk.h, which
will be extended in later patches in the patchset.
This header file will contain the in-kernel FPGA client driver API.

Signed-off-by: default avatarIlan Tayari <ilant@mellanox.com>
Signed-off-by: default avatarSaeed Mahameed <saeedm@mellanox.com>
parent 6062118d

drivers/net/ethernet/mellanox/mlx5/core/Makefile

+1 −1
Original line number Diff line number Diff line
@@ -6,7 +6,7 @@ mlx5_core-y := main.o cmd.o debugfs.o fw.o eq.o uar.o pagealloc.o \ 
		mad.o transobj.o vport.o sriov.o fs_cmd.o fs_core.o \

		fs_counters.o rl.o lag.o dev.o lib/gid.o



mlx5_core-$(CONFIG_MLX5_FPGA) += fpga/cmd.o fpga/core.o

mlx5_core-$(CONFIG_MLX5_FPGA) += fpga/cmd.o fpga/core.o fpga/conn.o



mlx5_core-$(CONFIG_MLX5_CORE_EN) += wq.o eswitch.o eswitch_offloads.o \

		en_main.o en_common.o en_fs.o en_ethtool.o en_tx.o \

drivers/net/ethernet/mellanox/mlx5/core/fpga/conn.c

0 → 100644
+1042 −0

File added.

Preview size limit exceeded, changes collapsed.

drivers/net/ethernet/mellanox/mlx5/core/fpga/conn.h

0 → 100644
+96 −0
Original line number Diff line number Diff line 
/*

 * Copyright (c) 2017 Mellanox Technologies. All rights reserved.

 *

 * This software is available to you under a choice of one of two

 * licenses.  You may choose to be licensed under the terms of the GNU

 * General Public License (GPL) Version 2, available from the file

 * COPYING in the main directory of this source tree, or the

 * OpenIB.org BSD license below:

 *

 *     Redistribution and use in source and binary forms, with or

 *     without modification, are permitted provided that the following

 *     conditions are met:

 *

 *      - Redistributions of source code must retain the above

 *        copyright notice, this list of conditions and the following

 *        disclaimer.

 *

 *      - Redistributions in binary form must reproduce the above

 *        copyright notice, this list of conditions and the following

 *        disclaimer in the documentation and/or other materials

 *        provided with the distribution.

 *

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,

 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF

 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND

 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS

 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN

 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN

 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE

 * SOFTWARE.

 *

 */



#ifndef __MLX5_FPGA_CONN_H__

#define __MLX5_FPGA_CONN_H__



#include <linux/mlx5/cq.h>

#include <linux/mlx5/qp.h>



#include "fpga/core.h"

#include "fpga/sdk.h"

#include "wq.h"



struct mlx5_fpga_conn {

	struct mlx5_fpga_device *fdev;



	void (*recv_cb)(void *cb_arg, struct mlx5_fpga_dma_buf *buf);

	void *cb_arg;



	/* FPGA QP */

	u32 fpga_qpc[MLX5_ST_SZ_DW(fpga_qpc)];

	u32 fpga_qpn;



	/* CQ */

	struct {

		struct mlx5_cqwq wq;

		struct mlx5_frag_wq_ctrl wq_ctrl;

		struct mlx5_core_cq mcq;

		struct tasklet_struct tasklet;

	} cq;



	/* QP */

	struct {

		bool active;

		int sgid_index;

		struct mlx5_wq_qp wq;

		struct mlx5_wq_ctrl wq_ctrl;

		struct mlx5_core_qp mqp;

		struct {

			spinlock_t lock; /* Protects all SQ state */

			unsigned int pc;

			unsigned int cc;

			unsigned int size;

			struct mlx5_fpga_dma_buf **bufs;

			struct list_head backlog;

		} sq;

		struct {

			unsigned int pc;

			unsigned int cc;

			unsigned int size;

			struct mlx5_fpga_dma_buf **bufs;

		} rq;

	} qp;

};



int mlx5_fpga_conn_device_init(struct mlx5_fpga_device *fdev);

void mlx5_fpga_conn_device_cleanup(struct mlx5_fpga_device *fdev);

struct mlx5_fpga_conn *

mlx5_fpga_conn_create(struct mlx5_fpga_device *fdev,

		      struct mlx5_fpga_conn_attr *attr,

		      enum mlx5_ifc_fpga_qp_type qp_type);

void mlx5_fpga_conn_destroy(struct mlx5_fpga_conn *conn);

int mlx5_fpga_conn_send(struct mlx5_fpga_conn *conn,

			struct mlx5_fpga_dma_buf *buf);



#endif /* __MLX5_FPGA_CONN_H__ */

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

+12 −0
Original line number Diff line number Diff line
@@ -37,6 +37,7 @@ 
#include "mlx5_core.h"

#include "lib/mlx5.h"

#include "fpga/core.h"

#include "fpga/conn.h"



static const char *const mlx5_fpga_error_strings[] = {

	"Null Syndrome",
@@ -127,7 +128,17 @@ int mlx5_fpga_device_start(struct mlx5_core_dev *mdev) 


	max_num_qps = MLX5_CAP_FPGA(mdev, shell_caps.max_num_qps);

	err = mlx5_core_reserve_gids(mdev, max_num_qps);

	if (err)

		goto out;



	err = mlx5_fpga_conn_device_init(fdev);

	if (err)

		goto err_rsvd_gid;



	goto out;



err_rsvd_gid:

	mlx5_core_unreserve_gids(mdev, max_num_qps);

out:

	spin_lock_irqsave(&fdev->state_lock, flags);

	fdev->state = err ? MLX5_FPGA_STATUS_FAILURE : MLX5_FPGA_STATUS_SUCCESS;
@@ -173,6 +184,7 @@ void mlx5_fpga_device_stop(struct mlx5_core_dev *mdev) 
	fdev->state = MLX5_FPGA_STATUS_NONE;

	spin_unlock_irqrestore(&fdev->state_lock, flags);



	mlx5_fpga_conn_device_cleanup(fdev);

	max_num_qps = MLX5_CAP_FPGA(mdev, shell_caps.max_num_qps);

	mlx5_core_unreserve_gids(mdev, max_num_qps);

}

drivers/net/ethernet/mellanox/mlx5/core/fpga/core.h

+7 −0
Original line number Diff line number Diff line
@@ -44,6 +44,13 @@ struct mlx5_fpga_device { 
	enum mlx5_fpga_status state;

	enum mlx5_fpga_image last_admin_image;

	enum mlx5_fpga_image last_oper_image;



	/* QP Connection resources */

	struct {

		u32 pdn;

		struct mlx5_core_mkey mkey;

		struct mlx5_uars_page *uar;

	} conn_res;

};



#define mlx5_fpga_dbg(__adev, format, ...) \