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1/*******************************************************************************
2
3 Intel 10 Gigabit PCI Express Linux driver
4 Copyright(c) 1999 - 2014 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 */
43static s32 ixgbe_ieee_credits(__u8 *bw, __u16 *refill,
44 __u16 *max, int max_frame)
45{
46 int min_percent = 100;
47 int min_credit, multiplier;
48 int i;
49
50 min_credit = ((max_frame / 2) + DCB_CREDIT_QUANTUM - 1) /
51 DCB_CREDIT_QUANTUM;
52
53 for (i = 0; i < MAX_TRAFFIC_CLASS; i++) {
54 if (bw[i] < min_percent && bw[i])
55 min_percent = bw[i];
56 }
57
58 multiplier = (min_credit / min_percent) + 1;
59
60 /* Find out the hw credits for each TC */
61 for (i = 0; i < MAX_TRAFFIC_CLASS; i++) {
62 int val = min(bw[i] * multiplier, MAX_CREDIT_REFILL);
63
64 if (val < min_credit)
65 val = min_credit;
66 refill[i] = val;
67
68 max[i] = bw[i] ? (bw[i] * MAX_CREDIT)/100 : min_credit;
69 }
70 return 0;
71}
72
73/**
74 * ixgbe_dcb_calculate_tc_credits - Calculates traffic class credits
75 * @ixgbe_dcb_config: Struct containing DCB settings.
76 * @direction: Configuring either Tx or Rx.
77 *
78 * This function calculates the credits allocated to each traffic class.
79 * It should be called only after the rules are checked by
80 * ixgbe_dcb_check_config().
81 */
82s32 ixgbe_dcb_calculate_tc_credits(struct ixgbe_hw *hw,
83 struct ixgbe_dcb_config *dcb_config,
84 int max_frame, u8 direction)
85{
86 struct tc_bw_alloc *p;
87 int min_credit;
88 int min_multiplier;
89 int min_percent = 100;
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)
98 return DCB_ERR_CONFIG;
99
100 min_credit = ((max_frame / 2) + DCB_CREDIT_QUANTUM - 1) /
101 DCB_CREDIT_QUANTUM;
102
103 /* Find smallest link percentage */
104 for (i = 0; i < MAX_TRAFFIC_CLASS; i++) {
105 p = &dcb_config->tc_config[i].path[direction];
106 bw_percent = dcb_config->bw_percentage[direction][p->bwg_id];
107 link_percentage = p->bwg_percent;
108
109 link_percentage = (link_percentage * bw_percent) / 100;
110
111 if (link_percentage && link_percentage < min_percent)
112 min_percent = link_percentage;
113 }
114
115 /*
116 * The ratio between traffic classes will control the bandwidth
117 * percentages seen on the wire. To calculate this ratio we use
118 * a multiplier. It is required that the refill credits must be
119 * larger than the max frame size so here we find the smallest
120 * multiplier that will allow all bandwidth percentages to be
121 * greater than the max frame size.
122 */
123 min_multiplier = (min_credit / min_percent) + 1;
124
125 /* Find out the link percentage for each TC first */
126 for (i = 0; i < MAX_TRAFFIC_CLASS; i++) {
127 p = &dcb_config->tc_config[i].path[direction];
128 bw_percent = dcb_config->bw_percentage[direction][p->bwg_id];
129
130 link_percentage = p->bwg_percent;
131 /* Must be careful of integer division for very small nums */
132 link_percentage = (link_percentage * bw_percent) / 100;
133 if (p->bwg_percent > 0 && link_percentage == 0)
134 link_percentage = 1;
135
136 /* Save link_percentage for reference */
137 p->link_percent = (u8)link_percentage;
138
139 /* Calculate credit refill ratio using multiplier */
140 credit_refill = min(link_percentage * min_multiplier,
141 MAX_CREDIT_REFILL);
142
143 /* Refill at least minimum credit */
144 if (credit_refill < min_credit)
145 credit_refill = min_credit;
146
147 p->data_credits_refill = (u16)credit_refill;
148
149 /* Calculate maximum credit for the TC */
150 credit_max = (link_percentage * MAX_CREDIT) / 100;
151
152 /*
153 * Adjustment based on rule checking, if the percentage
154 * of a TC is too small, the maximum credit may not be
155 * enough to send out a jumbo frame in data plane arbitration.
156 */
157 if (credit_max < min_credit)
158 credit_max = min_credit;
159
160 if (direction == DCB_TX_CONFIG) {
161 /*
162 * Adjustment based on rule checking, if the
163 * percentage of a TC is too small, the maximum
164 * credit may not be enough to send out a TSO
165 * packet in descriptor plane arbitration.
166 */
167 if ((hw->mac.type == ixgbe_mac_82598EB) &&
168 credit_max &&
169 (credit_max < MINIMUM_CREDIT_FOR_TSO))
170 credit_max = MINIMUM_CREDIT_FOR_TSO;
171
172 dcb_config->tc_config[i].desc_credits_max =
173 (u16)credit_max;
174 }
175
176 p->data_credits_max = (u16)credit_max;
177 }
178
179 return 0;
180}
181
182void ixgbe_dcb_unpack_pfc(struct ixgbe_dcb_config *cfg, u8 *pfc_en)
183{
184 struct tc_configuration *tc_config = &cfg->tc_config[0];
185 int tc;
186
187 for (*pfc_en = 0, tc = 0; tc < MAX_TRAFFIC_CLASS; tc++) {
188 if (tc_config[tc].dcb_pfc != pfc_disabled)
189 *pfc_en |= 1 << tc;
190 }
191}
192
193void ixgbe_dcb_unpack_refill(struct ixgbe_dcb_config *cfg, int direction,
194 u16 *refill)
195{
196 struct tc_configuration *tc_config = &cfg->tc_config[0];
197 int tc;
198
199 for (tc = 0; tc < MAX_TRAFFIC_CLASS; tc++)
200 refill[tc] = tc_config[tc].path[direction].data_credits_refill;
201}
202
203void ixgbe_dcb_unpack_max(struct ixgbe_dcb_config *cfg, u16 *max)
204{
205 struct tc_configuration *tc_config = &cfg->tc_config[0];
206 int tc;
207
208 for (tc = 0; tc < MAX_TRAFFIC_CLASS; tc++)
209 max[tc] = tc_config[tc].desc_credits_max;
210}
211
212void ixgbe_dcb_unpack_bwgid(struct ixgbe_dcb_config *cfg, int direction,
213 u8 *bwgid)
214{
215 struct tc_configuration *tc_config = &cfg->tc_config[0];
216 int tc;
217
218 for (tc = 0; tc < MAX_TRAFFIC_CLASS; tc++)
219 bwgid[tc] = tc_config[tc].path[direction].bwg_id;
220}
221
222void ixgbe_dcb_unpack_prio(struct ixgbe_dcb_config *cfg, int direction,
223 u8 *ptype)
224{
225 struct tc_configuration *tc_config = &cfg->tc_config[0];
226 int tc;
227
228 for (tc = 0; tc < MAX_TRAFFIC_CLASS; tc++)
229 ptype[tc] = tc_config[tc].path[direction].prio_type;
230}
231
232u8 ixgbe_dcb_get_tc_from_up(struct ixgbe_dcb_config *cfg, int direction, u8 up)
233{
234 struct tc_configuration *tc_config = &cfg->tc_config[0];
235 u8 prio_mask = 1 << up;
236 u8 tc = cfg->num_tcs.pg_tcs;
237
238 /* If tc is 0 then DCB is likely not enabled or supported */
239 if (!tc)
240 return 0;
241
242 /*
243 * Test from maximum TC to 1 and report the first match we find. If
244 * we find no match we can assume that the TC is 0 since the TC must
245 * be set for all user priorities
246 */
247 for (tc--; tc; tc--) {
248 if (prio_mask & tc_config[tc].path[direction].up_to_tc_bitmap)
249 break;
250 }
251
252 return tc;
253}
254
255void ixgbe_dcb_unpack_map(struct ixgbe_dcb_config *cfg, int direction, u8 *map)
256{
257 u8 up;
258
259 for (up = 0; up < MAX_USER_PRIORITY; up++)
260 map[up] = ixgbe_dcb_get_tc_from_up(cfg, direction, up);
261}
262
263/**
264 * ixgbe_dcb_hw_config - Config and enable DCB
265 * @hw: pointer to hardware structure
266 * @dcb_config: pointer to ixgbe_dcb_config structure
267 *
268 * Configure dcb settings and enable dcb mode.
269 */
270s32 ixgbe_dcb_hw_config(struct ixgbe_hw *hw,
271 struct ixgbe_dcb_config *dcb_config)
272{
273 u8 pfc_en;
274 u8 ptype[MAX_TRAFFIC_CLASS];
275 u8 bwgid[MAX_TRAFFIC_CLASS];
276 u8 prio_tc[MAX_TRAFFIC_CLASS];
277 u16 refill[MAX_TRAFFIC_CLASS];
278 u16 max[MAX_TRAFFIC_CLASS];
279
280 /* Unpack CEE standard containers */
281 ixgbe_dcb_unpack_pfc(dcb_config, &pfc_en);
282 ixgbe_dcb_unpack_refill(dcb_config, DCB_TX_CONFIG, refill);
283 ixgbe_dcb_unpack_max(dcb_config, max);
284 ixgbe_dcb_unpack_bwgid(dcb_config, DCB_TX_CONFIG, bwgid);
285 ixgbe_dcb_unpack_prio(dcb_config, DCB_TX_CONFIG, ptype);
286 ixgbe_dcb_unpack_map(dcb_config, DCB_TX_CONFIG, prio_tc);
287
288 switch (hw->mac.type) {
289 case ixgbe_mac_82598EB:
290 return ixgbe_dcb_hw_config_82598(hw, pfc_en, refill, max,
291 bwgid, ptype);
292 case ixgbe_mac_82599EB:
293 case ixgbe_mac_X540:
294 case ixgbe_mac_X550:
295 case ixgbe_mac_X550EM_x:
296 return ixgbe_dcb_hw_config_82599(hw, pfc_en, refill, max,
297 bwgid, ptype, prio_tc);
298 default:
299 break;
300 }
301 return 0;
302}
303
304/* Helper routines to abstract HW specifics from DCB netlink ops */
305s32 ixgbe_dcb_hw_pfc_config(struct ixgbe_hw *hw, u8 pfc_en, u8 *prio_tc)
306{
307 switch (hw->mac.type) {
308 case ixgbe_mac_82598EB:
309 return ixgbe_dcb_config_pfc_82598(hw, pfc_en);
310 case ixgbe_mac_82599EB:
311 case ixgbe_mac_X540:
312 case ixgbe_mac_X550:
313 case ixgbe_mac_X550EM_x:
314 return ixgbe_dcb_config_pfc_82599(hw, pfc_en, prio_tc);
315 default:
316 break;
317 }
318 return -EINVAL;
319}
320
321s32 ixgbe_dcb_hw_ets(struct ixgbe_hw *hw, struct ieee_ets *ets, int max_frame)
322{
323 __u16 refill[IEEE_8021QAZ_MAX_TCS], max[IEEE_8021QAZ_MAX_TCS];
324 __u8 prio_type[IEEE_8021QAZ_MAX_TCS];
325 int i;
326
327 /* naively give each TC a bwg to map onto CEE hardware */
328 __u8 bwg_id[IEEE_8021QAZ_MAX_TCS] = {0, 1, 2, 3, 4, 5, 6, 7};
329
330 /* Map TSA onto CEE prio type */
331 for (i = 0; i < IEEE_8021QAZ_MAX_TCS; i++) {
332 switch (ets->tc_tsa[i]) {
333 case IEEE_8021QAZ_TSA_STRICT:
334 prio_type[i] = 2;
335 break;
336 case IEEE_8021QAZ_TSA_ETS:
337 prio_type[i] = 0;
338 break;
339 default:
340 /* Hardware only supports priority strict or
341 * ETS transmission selection algorithms if
342 * we receive some other value from dcbnl
343 * throw an error
344 */
345 return -EINVAL;
346 }
347 }
348
349 ixgbe_ieee_credits(ets->tc_tx_bw, refill, max, max_frame);
350 return ixgbe_dcb_hw_ets_config(hw, refill, max,
351 bwg_id, prio_type, ets->prio_tc);
352}
353
354s32 ixgbe_dcb_hw_ets_config(struct ixgbe_hw *hw,
355 u16 *refill, u16 *max, u8 *bwg_id,
356 u8 *prio_type, u8 *prio_tc)
357{
358 switch (hw->mac.type) {
359 case ixgbe_mac_82598EB:
360 ixgbe_dcb_config_rx_arbiter_82598(hw, refill, max,
361 prio_type);
362 ixgbe_dcb_config_tx_desc_arbiter_82598(hw, refill, max,
363 bwg_id, prio_type);
364 ixgbe_dcb_config_tx_data_arbiter_82598(hw, refill, max,
365 bwg_id, prio_type);
366 break;
367 case ixgbe_mac_82599EB:
368 case ixgbe_mac_X540:
369 case ixgbe_mac_X550:
370 case ixgbe_mac_X550EM_x:
371 ixgbe_dcb_config_rx_arbiter_82599(hw, refill, max,
372 bwg_id, prio_type, prio_tc);
373 ixgbe_dcb_config_tx_desc_arbiter_82599(hw, refill, max,
374 bwg_id, prio_type);
375 ixgbe_dcb_config_tx_data_arbiter_82599(hw, refill, max, bwg_id,
376 prio_type, prio_tc);
377 break;
378 default:
379 break;
380 }
381 return 0;
382}
383
384static void ixgbe_dcb_read_rtrup2tc_82599(struct ixgbe_hw *hw, u8 *map)
385{
386 u32 reg, i;
387
388 reg = IXGBE_READ_REG(hw, IXGBE_RTRUP2TC);
389 for (i = 0; i < MAX_USER_PRIORITY; i++)
390 map[i] = IXGBE_RTRUP2TC_UP_MASK &
391 (reg >> (i * IXGBE_RTRUP2TC_UP_SHIFT));
392}
393
394void ixgbe_dcb_read_rtrup2tc(struct ixgbe_hw *hw, u8 *map)
395{
396 switch (hw->mac.type) {
397 case ixgbe_mac_82599EB:
398 case ixgbe_mac_X540:
399 case ixgbe_mac_X550:
400 case ixgbe_mac_X550EM_x:
401 ixgbe_dcb_read_rtrup2tc_82599(hw, map);
402 break;
403 default:
404 break;
405 }
406}