drivers/net/ixgbe/ixgbe_dcb.h

   1 /*******************************************************************************
   2
   3   Intel 10 Gigabit PCI Express Linux driver
   4   Copyright(c) 1999 - 2011 Intel Corporation.
   5
   6   This program is free software; you can redistribute it and/or modify it
   7   under the terms and conditions of the GNU General Public License,
   8   version 2, as published by the Free Software Foundation.
   9
  10   This program is distributed in the hope it will be useful, but WITHOUT
  11   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12   FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  13   more details.
  14
  15   You should have received a copy of the GNU General Public License along with
  16   this program; if not, write to the Free Software Foundation, Inc.,
  17   51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
  18
  19   The full GNU General Public License is included in this distribution in
  20   the file called "COPYING".
  21
  22   Contact Information:
  23   Linux NICS <linux.nics@intel.com>
  24   e1000-devel Mailing List <e1000-devel@lists.sourceforge.net>
  25   Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  26
  27 *******************************************************************************/
  28
  29 #ifndef _DCB_CONFIG_H_
  30 #define _DCB_CONFIG_H_
  31
  32 #include "ixgbe_type.h"
  33
  34 /* DCB data structures */
  35
  36 #define IXGBE_MAX_PACKET_BUFFERS 8
  37 #define MAX_USER_PRIORITY        8
  38 #define MAX_TRAFFIC_CLASS        8
  39 #define MAX_BW_GROUP             8
  40 #define BW_PERCENT               100
  41
  42 #define DCB_TX_CONFIG            0
  43 #define DCB_RX_CONFIG            1
  44
  45 /* DCB error Codes */
  46 #define DCB_SUCCESS              0
  47 #define DCB_ERR_CONFIG           -1
  48 #define DCB_ERR_PARAM            -2
  49
  50 /* Transmit and receive Errors */
  51 /* Error in bandwidth group allocation */
  52 #define DCB_ERR_BW_GROUP        -3
  53 /* Error in traffic class bandwidth allocation */
  54 #define DCB_ERR_TC_BW           -4
  55 /* Traffic class has both link strict and group strict enabled */
  56 #define DCB_ERR_LS_GS           -5
  57 /* Link strict traffic class has non zero bandwidth */
  58 #define DCB_ERR_LS_BW_NONZERO   -6
  59 /* Link strict bandwidth group has non zero bandwidth */
  60 #define DCB_ERR_LS_BWG_NONZERO  -7
  61 /*  Traffic class has zero bandwidth */
  62 #define DCB_ERR_TC_BW_ZERO      -8
  63
  64 #define DCB_NOT_IMPLEMENTED      0x7FFFFFFF
  65
  66 struct dcb_pfc_tc_debug {
  67         u8  tc;
  68         u8  pause_status;
  69         u64 pause_quanta;
  70 };
  71
  72 enum strict_prio_type {
  73         prio_none = 0,
  74         prio_group,
  75         prio_link
  76 };
  77
  78 /* DCB capability definitions */
  79 #define IXGBE_DCB_PG_SUPPORT        0x00000001
  80 #define IXGBE_DCB_PFC_SUPPORT       0x00000002
  81 #define IXGBE_DCB_BCN_SUPPORT       0x00000004
  82 #define IXGBE_DCB_UP2TC_SUPPORT     0x00000008
  83 #define IXGBE_DCB_GSP_SUPPORT       0x00000010
  84
  85 #define IXGBE_DCB_8_TC_SUPPORT      0x80
  86
  87 struct dcb_support {
  88         /* DCB capabilities */
  89         u32 capabilities;
  90
  91         /* Each bit represents a number of TCs configurable in the hw.
  92          * If 8 traffic classes can be configured, the value is 0x80.
  93          */
  94         u8  traffic_classes;
  95         u8  pfc_traffic_classes;
  96 };
  97
  98 /* Traffic class bandwidth allocation per direction */
  99 struct tc_bw_alloc {
 100         u8 bwg_id;                /* Bandwidth Group (BWG) ID */
 101         u8 bwg_percent;           /* % of BWG's bandwidth */
 102         u8 link_percent;          /* % of link bandwidth */
 103         u8 up_to_tc_bitmap;       /* User Priority to Traffic Class mapping */
 104         u16 data_credits_refill;  /* Credit refill amount in 64B granularity */
 105         u16 data_credits_max;     /* Max credits for a configured packet buffer
 106                                    * in 64B granularity.*/
 107         enum strict_prio_type prio_type; /* Link or Group Strict Priority */
 108 };
 109
 110 enum dcb_pfc_type {
 111         pfc_disabled = 0,
 112         pfc_enabled_full,
 113         pfc_enabled_tx,
 114         pfc_enabled_rx
 115 };
 116
 117 /* Traffic class configuration */
 118 struct tc_configuration {
 119         struct tc_bw_alloc path[2]; /* One each for Tx/Rx */
 120         enum dcb_pfc_type  dcb_pfc; /* Class based flow control setting */
 121
 122         u16 desc_credits_max; /* For Tx Descriptor arbitration */
 123         u8 tc; /* Traffic class (TC) */
 124 };
 125
 126 struct dcb_num_tcs {
 127         u8 pg_tcs;
 128         u8 pfc_tcs;
 129 };
 130
 131 struct ixgbe_dcb_config {
 132         struct dcb_support support;
 133         struct dcb_num_tcs num_tcs;
 134         struct tc_configuration tc_config[MAX_TRAFFIC_CLASS];
 135         u8     bw_percentage[2][MAX_BW_GROUP]; /* One each for Tx/Rx */
 136         bool   pfc_mode_enable;
 137
 138         u32  dcb_cfg_version; /* Not used...OS-specific? */
 139         u32  link_speed; /* For bandwidth allocation validation purpose */
 140 };
 141
 142 /* DCB driver APIs */
 143 void ixgbe_dcb_unpack_pfc(struct ixgbe_dcb_config *cfg, u8 *pfc_en);
 144 void ixgbe_dcb_unpack_refill(struct ixgbe_dcb_config *, int, u16 *);
 145 void ixgbe_dcb_unpack_max(struct ixgbe_dcb_config *, u16 *);
 146 void ixgbe_dcb_unpack_bwgid(struct ixgbe_dcb_config *, int, u8 *);
 147 void ixgbe_dcb_unpack_prio(struct ixgbe_dcb_config *, int, u8 *);
 148
 149 /* DCB credits calculation */
 150 s32 ixgbe_ieee_credits(__u8 *bw, __u16 *refill, __u16 *max, int max_frame);
 151 s32 ixgbe_dcb_calculate_tc_credits(struct ixgbe_hw *,
 152                                    struct ixgbe_dcb_config *, int, u8);
 153
 154 /* DCB hw initialization */
 155 s32 ixgbe_dcb_hw_ets_config(struct ixgbe_hw *hw, u16 *refill, u16 *max,
 156                             u8 *bwg_id, u8 *prio_type, u8 *tc_prio);
 157 s32 ixgbe_dcb_hw_pfc_config(struct ixgbe_hw *hw, u8 pfc_en);
 158 s32 ixgbe_dcb_hw_config(struct ixgbe_hw *, struct ixgbe_dcb_config *);
 159
 160 /* DCB definitions for credit calculation */
 161 #define DCB_CREDIT_QUANTUM      64   /* DCB Quantum */
 162 #define MAX_CREDIT_REFILL       511  /* 0x1FF * 64B = 32704B */
 163 #define DCB_MAX_TSO_SIZE        (32*1024) /* MAX TSO packet size supported in DCB mode */
 164 #define MINIMUM_CREDIT_FOR_TSO  (DCB_MAX_TSO_SIZE/64 + 1) /* 513 for 32KB TSO packet */
 165 #define MAX_CREDIT              4095 /* Maximum credit supported: 256KB * 1204 / 64B */
 166
 167 #endif /* _DCB_CONFIG_H */