1/* SPDX-License-Identifier: GPL-2.0 */
  2/* Copyright(c) 1999 - 2018 Intel Corporation. */
  3
  4#ifndef _DCB_CONFIG_H_
  5#define _DCB_CONFIG_H_
  6
  7#include <linux/dcbnl.h>
  8#include "ixgbe_type.h"
  9
 10/* DCB data structures */
 11
 12#define IXGBE_MAX_PACKET_BUFFERS 8
 13#define MAX_USER_PRIORITY        8
 14#define MAX_BW_GROUP             8
 15#define BW_PERCENT               100
 16
 17#define DCB_TX_CONFIG            0
 18#define DCB_RX_CONFIG            1
 19
 20/* DCB error Codes */
 21#define DCB_SUCCESS              0
 22#define DCB_ERR_CONFIG           -1
 23#define DCB_ERR_PARAM            -2
 24
 25/* Transmit and receive Errors */
 26/* Error in bandwidth group allocation */
 27#define DCB_ERR_BW_GROUP        -3
 28/* Error in traffic class bandwidth allocation */
 29#define DCB_ERR_TC_BW           -4
 30/* Traffic class has both link strict and group strict enabled */
 31#define DCB_ERR_LS_GS           -5
 32/* Link strict traffic class has non zero bandwidth */
 33#define DCB_ERR_LS_BW_NONZERO   -6
 34/* Link strict bandwidth group has non zero bandwidth */
 35#define DCB_ERR_LS_BWG_NONZERO  -7
 36/*  Traffic class has zero bandwidth */
 37#define DCB_ERR_TC_BW_ZERO      -8
 38
 39#define DCB_NOT_IMPLEMENTED      0x7FFFFFFF
 40
 41struct dcb_pfc_tc_debug {
 42	u8  tc;
 43	u8  pause_status;
 44	u64 pause_quanta;
 45};
 46
 47enum strict_prio_type {
 48	prio_none = 0,
 49	prio_group,
 50	prio_link
 51};
 52
 53/* DCB capability definitions */
 54#define IXGBE_DCB_PG_SUPPORT        0x00000001
 55#define IXGBE_DCB_PFC_SUPPORT       0x00000002
 56#define IXGBE_DCB_BCN_SUPPORT       0x00000004
 57#define IXGBE_DCB_UP2TC_SUPPORT     0x00000008
 58#define IXGBE_DCB_GSP_SUPPORT       0x00000010
 59
 60#define IXGBE_DCB_8_TC_SUPPORT      0x80
 61
 62struct dcb_support {
 63	/* DCB capabilities */
 64	u32 capabilities;
 65
 66	/* Each bit represents a number of TCs configurable in the hw.
 67	 * If 8 traffic classes can be configured, the value is 0x80.
 68	 */
 69	u8  traffic_classes;
 70	u8  pfc_traffic_classes;
 71};
 72
 73/* Traffic class bandwidth allocation per direction */
 74struct tc_bw_alloc {
 75	u8 bwg_id;		  /* Bandwidth Group (BWG) ID */
 76	u8 bwg_percent;		  /* % of BWG's bandwidth */
 77	u8 link_percent;	  /* % of link bandwidth */
 78	u8 up_to_tc_bitmap;	  /* User Priority to Traffic Class mapping */
 79	u16 data_credits_refill;  /* Credit refill amount in 64B granularity */
 80	u16 data_credits_max;	  /* Max credits for a configured packet buffer
 81				   * in 64B granularity.*/
 82	enum strict_prio_type prio_type; /* Link or Group Strict Priority */
 83};
 84
 85enum dcb_pfc_type {
 86	pfc_disabled = 0,
 87	pfc_enabled_full,
 88	pfc_enabled_tx,
 89	pfc_enabled_rx
 90};
 91
 92/* Traffic class configuration */
 93struct tc_configuration {
 94	struct tc_bw_alloc path[2]; /* One each for Tx/Rx */
 95	enum dcb_pfc_type  dcb_pfc; /* Class based flow control setting */
 96
 97	u16 desc_credits_max; /* For Tx Descriptor arbitration */
 98	u8 tc; /* Traffic class (TC) */
 99};
100
101struct dcb_num_tcs {
102	u8 pg_tcs;
103	u8 pfc_tcs;
104};
105
106struct ixgbe_dcb_config {
107	struct dcb_support support;
108	struct dcb_num_tcs num_tcs;
109	struct tc_configuration tc_config[MAX_TRAFFIC_CLASS];
110	u8     bw_percentage[2][MAX_BW_GROUP]; /* One each for Tx/Rx */
111	bool   pfc_mode_enable;
112
113	u32  dcb_cfg_version; /* Not used...OS-specific? */
114	u32  link_speed; /* For bandwidth allocation validation purpose */
115};
116
117/* DCB driver APIs */
118void ixgbe_dcb_unpack_pfc(struct ixgbe_dcb_config *cfg, u8 *pfc_en);
119void ixgbe_dcb_unpack_refill(struct ixgbe_dcb_config *, int, u16 *);
120void ixgbe_dcb_unpack_max(struct ixgbe_dcb_config *, u16 *);
121void ixgbe_dcb_unpack_bwgid(struct ixgbe_dcb_config *, int, u8 *);
122void ixgbe_dcb_unpack_prio(struct ixgbe_dcb_config *, int, u8 *);
123void ixgbe_dcb_unpack_map(struct ixgbe_dcb_config *, int, u8 *);
124u8 ixgbe_dcb_get_tc_from_up(struct ixgbe_dcb_config *, int, u8);
125
126/* DCB credits calculation */
127int ixgbe_dcb_calculate_tc_credits(struct ixgbe_hw *,
128				   struct ixgbe_dcb_config *, int, u8);
129
130/* DCB hw initialization */
131int ixgbe_dcb_hw_ets(struct ixgbe_hw *hw, struct ieee_ets *ets, int max);
132int ixgbe_dcb_hw_ets_config(struct ixgbe_hw *hw, u16 *refill, u16 *max,
133			    u8 *bwg_id, u8 *prio_type, u8 *tc_prio);
134int ixgbe_dcb_hw_pfc_config(struct ixgbe_hw *hw, u8 pfc_en, u8 *tc_prio);
135int ixgbe_dcb_hw_config(struct ixgbe_hw *, struct ixgbe_dcb_config *);
136
137void ixgbe_dcb_read_rtrup2tc(struct ixgbe_hw *hw, u8 *map);
138
139/* DCB definitions for credit calculation */
140#define DCB_CREDIT_QUANTUM	64   /* DCB Quantum */
141#define MAX_CREDIT_REFILL       511  /* 0x1FF * 64B = 32704B */
142#define DCB_MAX_TSO_SIZE        (32*1024) /* MAX TSO packet size supported in DCB mode */
143#define MINIMUM_CREDIT_FOR_TSO  (DCB_MAX_TSO_SIZE/64 + 1) /* 513 for 32KB TSO packet */
144#define MAX_CREDIT              4095 /* Maximum credit supported: 256KB * 1204 / 64B */
145
146#endif /* _DCB_CONFIG_H */