1 /*
2  * Copyright (c) 2018, Mellanox Technologies. All rights reserved.
3  *
4  * This software is available to you under a choice of one of two
5  * licenses.  You may choose to be licensed under the terms of the GNU
6  * General Public License (GPL) Version 2, available from the file
7  * COPYING in the main directory of this source tree, or the
8  * OpenIB.org BSD license below:
9  *
10  *     Redistribution and use in source and binary forms, with or
11  *     without modification, are permitted provided that the following
12  *     conditions are met:
13  *
14  *      - Redistributions of source code must retain the above
15  *        copyright notice, this list of conditions and the following
16  *        disclaimer.
17  *
18  *      - Redistributions in binary form must reproduce the above
19  *        copyright notice, this list of conditions and the following
20  *        disclaimer in the documentation and/or other materials
21  *        provided with the distribution.
22  *
23  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
25  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
26  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
27  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
28  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
29  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
30  * SOFTWARE.
31  */
32 #ifndef __MLX5_EN_PORT_BUFFER_H__
33 #define __MLX5_EN_PORT_BUFFER_H__
34 
35 #include "en.h"
36 #include "port.h"
37 
38 #define MLX5E_MAX_BUFFER 8
39 #define MLX5E_BUFFER_CELL_SHIFT 7
40 #define MLX5E_DEFAULT_CABLE_LEN 7 /* 7 meters */
41 
42 #define MLX5_BUFFER_SUPPORTED(mdev) (MLX5_CAP_GEN(mdev, pcam_reg) && \
43 				     MLX5_CAP_PCAM_REG(mdev, pbmc) && \
44 				     MLX5_CAP_PCAM_REG(mdev, pptb))
45 
46 enum {
47 	MLX5E_PORT_BUFFER_CABLE_LEN   = BIT(0),
48 	MLX5E_PORT_BUFFER_PFC         = BIT(1),
49 	MLX5E_PORT_BUFFER_PRIO2BUFFER = BIT(2),
50 	MLX5E_PORT_BUFFER_SIZE        = BIT(3),
51 };
52 
53 struct mlx5e_bufferx_reg {
54 	u8   lossy;
55 	u8   epsb;
56 	u32  size;
57 	u32  xoff;
58 	u32  xon;
59 };
60 
61 struct mlx5e_port_buffer {
62 	u32                       port_buffer_size;
63 	u32                       spare_buffer_size;
64 	struct mlx5e_bufferx_reg  buffer[MLX5E_MAX_BUFFER];
65 };
66 
67 int mlx5e_port_manual_buffer_config(struct mlx5e_priv *priv,
68 				    u32 change, unsigned int mtu,
69 				    struct ieee_pfc *pfc,
70 				    u32 *buffer_size,
71 				    u8 *prio2buffer);
72 
73 int mlx5e_port_query_buffer(struct mlx5e_priv *priv,
74 			    struct mlx5e_port_buffer *port_buffer);
75 #endif
76