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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
30#include "ixgbe.h"
31#include "ixgbe_type.h"
32#include "ixgbe_dcb.h"
33#include "ixgbe_dcb_82598.h"
34#include "ixgbe_dcb_82599.h"
35
36/**
37 * ixgbe_ieee_credits - This calculates the ieee traffic class
38 * credits from the configured bandwidth percentages. Credits
39 * are the smallest unit programmable into the underlying
40 * hardware. The IEEE 802.1Qaz specification do not use bandwidth
41 * groups so this is much simplified from the CEE case.
42 */
43s32 ixgbe_ieee_credits(__u8 *bw, __u16 *refill, __u16 *max, int max_frame)
44{
45 int min_percent = 100;
46 int min_credit, multiplier;
47 int i;
48
49 min_credit = ((max_frame / 2) + DCB_CREDIT_QUANTUM - 1) /
50 DCB_CREDIT_QUANTUM;
51
52 for (i = 0; i < MAX_TRAFFIC_CLASS; i++) {
53 if (bw[i] < min_percent && bw[i])
54 min_percent = bw[i];
55 }
56
57 multiplier = (min_credit / min_percent) + 1;
58
59 /* Find out the hw credits for each TC */
60 for (i = 0; i < MAX_TRAFFIC_CLASS; i++) {
61 int val = min(bw[i] * multiplier, MAX_CREDIT_REFILL);
62
63 if (val < min_credit)
64 val = min_credit;
65 refill[i] = val;
66
67 max[i] = bw[i] ? (bw[i] * MAX_CREDIT)/100 : min_credit;
68 }
69 return 0;
70}
71
72/**
73 * ixgbe_dcb_calculate_tc_credits - Calculates traffic class credits
74 * @ixgbe_dcb_config: Struct containing DCB settings.
75 * @direction: Configuring either Tx or Rx.
76 *
77 * This function calculates the credits allocated to each traffic class.
78 * It should be called only after the rules are checked by
79 * ixgbe_dcb_check_config().
80 */
81s32 ixgbe_dcb_calculate_tc_credits(struct ixgbe_hw *hw,
82 struct ixgbe_dcb_config *dcb_config,
83 int max_frame, u8 direction)
84{
85 struct tc_bw_alloc *p;
86 int min_credit;
87 int min_multiplier;
88 int min_percent = 100;
89 s32 ret_val = 0;
90 /* Initialization values default for Tx settings */
91 u32 credit_refill = 0;
92 u32 credit_max = 0;
93 u16 link_percentage = 0;
94 u8 bw_percent = 0;
95 u8 i;
96
97 if (dcb_config == NULL) {
98 ret_val = DCB_ERR_CONFIG;
99 goto out;
100 }
101
102 min_credit = ((max_frame / 2) + DCB_CREDIT_QUANTUM - 1) /
103 DCB_CREDIT_QUANTUM;
104
105 /* Find smallest link percentage */
106 for (i = 0; i < MAX_TRAFFIC_CLASS; i++) {
107 p = &dcb_config->tc_config[i].path[direction];
108 bw_percent = dcb_config->bw_percentage[direction][p->bwg_id];
109 link_percentage = p->bwg_percent;
110
111 link_percentage = (link_percentage * bw_percent) / 100;
112
113 if (link_percentage && link_percentage < min_percent)
114 min_percent = link_percentage;
115 }
116
117 /*
118 * The ratio between traffic classes will control the bandwidth
119 * percentages seen on the wire. To calculate this ratio we use
120 * a multiplier. It is required that the refill credits must be
121 * larger than the max frame size so here we find the smallest
122 * multiplier that will allow all bandwidth percentages to be
123 * greater than the max frame size.
124 */
125 min_multiplier = (min_credit / min_percent) + 1;
126
127 /* Find out the link percentage for each TC first */
128 for (i = 0; i < MAX_TRAFFIC_CLASS; i++) {
129 p = &dcb_config->tc_config[i].path[direction];
130 bw_percent = dcb_config->bw_percentage[direction][p->bwg_id];
131
132 link_percentage = p->bwg_percent;
133 /* Must be careful of integer division for very small nums */
134 link_percentage = (link_percentage * bw_percent) / 100;
135 if (p->bwg_percent > 0 && link_percentage == 0)
136 link_percentage = 1;
137
138 /* Save link_percentage for reference */
139 p->link_percent = (u8)link_percentage;
140
141 /* Calculate credit refill ratio using multiplier */
142 credit_refill = min(link_percentage * min_multiplier,
143 MAX_CREDIT_REFILL);
144 p->data_credits_refill = (u16)credit_refill;
145
146 /* Calculate maximum credit for the TC */
147 credit_max = (link_percentage * MAX_CREDIT) / 100;
148
149 /*
150 * Adjustment based on rule checking, if the percentage
151 * of a TC is too small, the maximum credit may not be
152 * enough to send out a jumbo frame in data plane arbitration.
153 */
154 if (credit_max && (credit_max < min_credit))
155 credit_max = min_credit;
156
157 if (direction == DCB_TX_CONFIG) {
158 /*
159 * Adjustment based on rule checking, if the
160 * percentage of a TC is too small, the maximum
161 * credit may not be enough to send out a TSO
162 * packet in descriptor plane arbitration.
163 */
164 if ((hw->mac.type == ixgbe_mac_82598EB) &&
165 credit_max &&
166 (credit_max < MINIMUM_CREDIT_FOR_TSO))
167 credit_max = MINIMUM_CREDIT_FOR_TSO;
168
169 dcb_config->tc_config[i].desc_credits_max =
170 (u16)credit_max;
171 }
172
173 p->data_credits_max = (u16)credit_max;
174 }
175
176out:
177 return ret_val;
178}
179
180void ixgbe_dcb_unpack_pfc(struct ixgbe_dcb_config *cfg, u8 *pfc_en)
181{
182 int i;
183
184 *pfc_en = 0;
185 for (i = 0; i < MAX_TRAFFIC_CLASS; i++)
186 *pfc_en |= (cfg->tc_config[i].dcb_pfc & 0xF) << i;
187}
188
189void ixgbe_dcb_unpack_refill(struct ixgbe_dcb_config *cfg, int direction,
190 u16 *refill)
191{
192 struct tc_bw_alloc *p;
193 int i;
194
195 for (i = 0; i < MAX_TRAFFIC_CLASS; i++) {
196 p = &cfg->tc_config[i].path[direction];
197 refill[i] = p->data_credits_refill;
198 }
199}
200
201void ixgbe_dcb_unpack_max(struct ixgbe_dcb_config *cfg, u16 *max)
202{
203 int i;
204
205 for (i = 0; i < MAX_TRAFFIC_CLASS; i++)
206 max[i] = cfg->tc_config[i].desc_credits_max;
207}
208
209void ixgbe_dcb_unpack_bwgid(struct ixgbe_dcb_config *cfg, int direction,
210 u8 *bwgid)
211{
212 struct tc_bw_alloc *p;
213 int i;
214
215 for (i = 0; i < MAX_TRAFFIC_CLASS; i++) {
216 p = &cfg->tc_config[i].path[direction];
217 bwgid[i] = p->bwg_id;
218 }
219}
220
221void ixgbe_dcb_unpack_prio(struct ixgbe_dcb_config *cfg, int direction,
222 u8 *ptype)
223{
224 struct tc_bw_alloc *p;
225 int i;
226
227 for (i = 0; i < MAX_TRAFFIC_CLASS; i++) {
228 p = &cfg->tc_config[i].path[direction];
229 ptype[i] = p->prio_type;
230 }
231}
232
233/**
234 * ixgbe_dcb_hw_config - Config and enable DCB
235 * @hw: pointer to hardware structure
236 * @dcb_config: pointer to ixgbe_dcb_config structure
237 *
238 * Configure dcb settings and enable dcb mode.
239 */
240s32 ixgbe_dcb_hw_config(struct ixgbe_hw *hw,
241 struct ixgbe_dcb_config *dcb_config)
242{
243 s32 ret = 0;
244 u8 pfc_en;
245 u8 ptype[MAX_TRAFFIC_CLASS];
246 u8 bwgid[MAX_TRAFFIC_CLASS];
247 u16 refill[MAX_TRAFFIC_CLASS];
248 u16 max[MAX_TRAFFIC_CLASS];
249 /* CEE does not define a priority to tc mapping so map 1:1 */
250 u8 prio_tc[MAX_TRAFFIC_CLASS] = {0, 1, 2, 3, 4, 5, 6, 7};
251
252 /* Unpack CEE standard containers */
253 ixgbe_dcb_unpack_pfc(dcb_config, &pfc_en);
254 ixgbe_dcb_unpack_refill(dcb_config, DCB_TX_CONFIG, refill);
255 ixgbe_dcb_unpack_max(dcb_config, max);
256 ixgbe_dcb_unpack_bwgid(dcb_config, DCB_TX_CONFIG, bwgid);
257 ixgbe_dcb_unpack_prio(dcb_config, DCB_TX_CONFIG, ptype);
258
259 switch (hw->mac.type) {
260 case ixgbe_mac_82598EB:
261 ret = ixgbe_dcb_hw_config_82598(hw, pfc_en, refill, max,
262 bwgid, ptype);
263 break;
264 case ixgbe_mac_82599EB:
265 case ixgbe_mac_X540:
266 ret = ixgbe_dcb_hw_config_82599(hw, pfc_en, refill, max,
267 bwgid, ptype, prio_tc);
268 break;
269 default:
270 break;
271 }
272 return ret;
273}
274
275/* Helper routines to abstract HW specifics from DCB netlink ops */
276s32 ixgbe_dcb_hw_pfc_config(struct ixgbe_hw *hw, u8 pfc_en)
277{
278 int ret = -EINVAL;
279
280 switch (hw->mac.type) {
281 case ixgbe_mac_82598EB:
282 ret = ixgbe_dcb_config_pfc_82598(hw, pfc_en);
283 break;
284 case ixgbe_mac_82599EB:
285 case ixgbe_mac_X540:
286 ret = ixgbe_dcb_config_pfc_82599(hw, pfc_en);
287 break;
288 default:
289 break;
290 }
291 return ret;
292}
293
294s32 ixgbe_dcb_hw_ets_config(struct ixgbe_hw *hw,
295 u16 *refill, u16 *max, u8 *bwg_id,
296 u8 *prio_type, u8 *prio_tc)
297{
298 switch (hw->mac.type) {
299 case ixgbe_mac_82598EB:
300 ixgbe_dcb_config_rx_arbiter_82598(hw, refill, max,
301 prio_type);
302 ixgbe_dcb_config_tx_desc_arbiter_82598(hw, refill, max,
303 bwg_id, prio_type);
304 ixgbe_dcb_config_tx_data_arbiter_82598(hw, refill, max,
305 bwg_id, prio_type);
306 break;
307 case ixgbe_mac_82599EB:
308 case ixgbe_mac_X540:
309 ixgbe_dcb_config_rx_arbiter_82599(hw, refill, max,
310 bwg_id, prio_type, prio_tc);
311 ixgbe_dcb_config_tx_desc_arbiter_82599(hw, refill, max,
312 bwg_id, prio_type);
313 ixgbe_dcb_config_tx_data_arbiter_82599(hw, refill, max, bwg_id,
314 prio_type, prio_tc);
315 break;
316 default:
317 break;
318 }
319 return 0;
320}