drivers/net/ethernet/intel/ixgbe/ixgbe_dcb.h

   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
  41 struct dcb_pfc_tc_debug {
  42         u8  tc;
  43         u8  pause_status;
  44         u64 pause_quanta;
  45 };
  46
  47 enum 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
  62 struct 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 */
  74 struct 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
  85 enum 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 */
  93 struct 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
 101 struct dcb_num_tcs {
 102         u8 pg_tcs;
 103         u8 pfc_tcs;
 104 };
 105
 106 struct 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 */
 118 void ixgbe_dcb_unpack_pfc(struct ixgbe_dcb_config *cfg, u8 *pfc_en);
 119 void ixgbe_dcb_unpack_refill(struct ixgbe_dcb_config *, int, u16 *);
 120 void ixgbe_dcb_unpack_max(struct ixgbe_dcb_config *, u16 *);
 121 void ixgbe_dcb_unpack_bwgid(struct ixgbe_dcb_config *, int, u8 *);
 122 void ixgbe_dcb_unpack_prio(struct ixgbe_dcb_config *, int, u8 *);
 123 void ixgbe_dcb_unpack_map(struct ixgbe_dcb_config *, int, u8 *);
 124 u8 ixgbe_dcb_get_tc_from_up(struct ixgbe_dcb_config *, int, u8);
 125
 126 /* DCB credits calculation */
 127 s32 ixgbe_dcb_calculate_tc_credits(struct ixgbe_hw *,
 128                                    struct ixgbe_dcb_config *, int, u8);
 129
 130 /* DCB hw initialization */
 131 s32 ixgbe_dcb_hw_ets(struct ixgbe_hw *hw, struct ieee_ets *ets, int max);
 132 s32 ixgbe_dcb_hw_ets_config(struct ixgbe_hw *hw, u16 *refill, u16 *max,
 133                             u8 *bwg_id, u8 *prio_type, u8 *tc_prio);
 134 s32 ixgbe_dcb_hw_pfc_config(struct ixgbe_hw *hw, u8 pfc_en, u8 *tc_prio);
 135 s32 ixgbe_dcb_hw_config(struct ixgbe_hw *, struct ixgbe_dcb_config *);
 136
 137 void 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 */