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Alexander Duyck2f90b862008-11-20 20:52:10 -08001/*******************************************************************************
2
3 Intel 10 Gigabit PCI Express Linux driver
4 Copyright(c) 1999 - 2007 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
66struct dcb_pfc_tc_debug {
67 u8 tc;
68 u8 pause_status;
69 u64 pause_quanta;
70};
71
72enum strict_prio_type {
73 prio_none = 0,
74 prio_group,
75 prio_link
76};
77
78/* Traffic class bandwidth allocation per direction */
79struct tc_bw_alloc {
80 u8 bwg_id; /* Bandwidth Group (BWG) ID */
81 u8 bwg_percent; /* % of BWG's bandwidth */
82 u8 link_percent; /* % of link bandwidth */
83 u8 up_to_tc_bitmap; /* User Priority to Traffic Class mapping */
84 u16 data_credits_refill; /* Credit refill amount in 64B granularity */
85 u16 data_credits_max; /* Max credits for a configured packet buffer
86 * in 64B granularity.*/
87 enum strict_prio_type prio_type; /* Link or Group Strict Priority */
88};
89
90enum dcb_pfc_type {
91 pfc_disabled = 0,
92 pfc_enabled_full,
93 pfc_enabled_tx,
94 pfc_enabled_rx
95};
96
97/* Traffic class configuration */
98struct tc_configuration {
99 struct tc_bw_alloc path[2]; /* One each for Tx/Rx */
100 enum dcb_pfc_type dcb_pfc; /* Class based flow control setting */
101
102 u16 desc_credits_max; /* For Tx Descriptor arbitration */
103 u8 tc; /* Traffic class (TC) */
104};
105
106enum dcb_rx_pba_cfg {
107 pba_equal, /* PBA[0-7] each use 64KB FIFO */
108 pba_80_48 /* PBA[0-3] each use 80KB, PBA[4-7] each use 48KB */
109};
110
Alexander Duyck859ee3c2008-11-20 21:10:23 -0800111/*
112 * This structure contains many values encoded as fixed-point
113 * numbers, meaning that some of bits are dedicated to the
114 * magnitude and others to the fraction part. In the comments
115 * this is shown as f=n, where n is the number of fraction bits.
116 * These fraction bits are always the low-order bits. The size
117 * of the magnitude is not specified.
118 */
119struct bcn_config {
120 u32 rp_admin_mode[MAX_TRAFFIC_CLASS]; /* BCN enabled, per TC */
121 u32 bcna_option[2]; /* BCNA Port + MAC Addr */
122 u32 rp_w; /* Derivative Weight, f=3 */
123 u32 rp_gi; /* Increase Gain, f=12 */
124 u32 rp_gd; /* Decrease Gain, f=12 */
125 u32 rp_ru; /* Rate Unit */
126 u32 rp_alpha; /* Max Decrease Factor, f=12 */
127 u32 rp_beta; /* Max Increase Factor, f=12 */
128 u32 rp_ri; /* Initial Rate */
129 u32 rp_td; /* Drift Interval Timer */
130 u32 rp_rd; /* Drift Increase */
131 u32 rp_tmax; /* Severe Congestion Backoff Timer Range */
132 u32 rp_rmin; /* Severe Congestion Restart Rate */
133 u32 rp_wrtt; /* RTT Moving Average Weight */
134};
135
Alexander Duyck2f90b862008-11-20 20:52:10 -0800136struct ixgbe_dcb_config {
Alexander Duyck859ee3c2008-11-20 21:10:23 -0800137 struct bcn_config bcn;
138
Alexander Duyck2f90b862008-11-20 20:52:10 -0800139 struct tc_configuration tc_config[MAX_TRAFFIC_CLASS];
140 u8 bw_percentage[2][MAX_BW_GROUP]; /* One each for Tx/Rx */
141
142 bool round_robin_enable;
143
144 enum dcb_rx_pba_cfg rx_pba_cfg;
145
146 u32 dcb_cfg_version; /* Not used...OS-specific? */
147 u32 link_speed; /* For bandwidth allocation validation purpose */
148};
149
150/* DCB driver APIs */
151
152/* DCB rule checking function.*/
153s32 ixgbe_dcb_check_config(struct ixgbe_dcb_config *config);
154
155/* DCB credits calculation */
156s32 ixgbe_dcb_calculate_tc_credits(struct ixgbe_dcb_config *, u8);
157
158/* DCB PFC functions */
159s32 ixgbe_dcb_config_pfc(struct ixgbe_hw *, struct ixgbe_dcb_config *g);
160s32 ixgbe_dcb_get_pfc_stats(struct ixgbe_hw *, struct ixgbe_hw_stats *, u8);
161
162/* DCB traffic class stats */
163s32 ixgbe_dcb_config_tc_stats(struct ixgbe_hw *);
164s32 ixgbe_dcb_get_tc_stats(struct ixgbe_hw *, struct ixgbe_hw_stats *, u8);
165
166/* DCB config arbiters */
167s32 ixgbe_dcb_config_tx_desc_arbiter(struct ixgbe_hw *,
168 struct ixgbe_dcb_config *);
169s32 ixgbe_dcb_config_tx_data_arbiter(struct ixgbe_hw *,
170 struct ixgbe_dcb_config *);
171s32 ixgbe_dcb_config_rx_arbiter(struct ixgbe_hw *, struct ixgbe_dcb_config *);
172
173/* DCB hw initialization */
174s32 ixgbe_dcb_hw_config(struct ixgbe_hw *, struct ixgbe_dcb_config *);
175
176/* DCB definitions for credit calculation */
177#define MAX_CREDIT_REFILL 511 /* 0x1FF * 64B = 32704B */
178#define MINIMUM_CREDIT_REFILL 5 /* 5*64B = 320B */
179#define MINIMUM_CREDIT_FOR_JUMBO 145 /* 145= UpperBound((9*1024+54)/64B) for 9KB jumbo frame */
180#define DCB_MAX_TSO_SIZE (32*1024) /* MAX TSO packet size supported in DCB mode */
181#define MINIMUM_CREDIT_FOR_TSO (DCB_MAX_TSO_SIZE/64 + 1) /* 513 for 32KB TSO packet */
182#define MAX_CREDIT 4095 /* Maximum credit supported: 256KB * 1204 / 64B */
183
184#endif /* _DCB_CONFIG_H */