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2f90b865 AD |
1 | /******************************************************************************* |
2 | ||
3 | Intel 10 Gigabit PCI Express Linux driver | |
a52055e0 | 4 | Copyright(c) 1999 - 2011 Intel Corporation. |
2f90b865 AD |
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" | |
235ea828 | 34 | #include "ixgbe_dcb_82599.h" |
2f90b865 | 35 | |
d033d526 JF |
36 | /** |
37 | * ixgbe_ieee_credits - This calculates the ieee traffic class | |
38 | * credits from the configured bandwidth percentages. Credits | |
25985edc | 39 | * are the smallest unit programmable into the underlying |
d033d526 JF |
40 | * hardware. The IEEE 802.1Qaz specification do not use bandwidth |
41 | * groups so this is much simplified from the CEE case. | |
42 | */ | |
43 | s32 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 | ||
1390a594 | 67 | max[i] = bw[i] ? (bw[i] * MAX_CREDIT)/100 : min_credit; |
d033d526 JF |
68 | } |
69 | return 0; | |
70 | } | |
71 | ||
2f90b865 AD |
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 | */ | |
80ab193d JF |
81 | s32 ixgbe_dcb_calculate_tc_credits(struct ixgbe_hw *hw, |
82 | struct ixgbe_dcb_config *dcb_config, | |
9806307a | 83 | int max_frame, u8 direction) |
2f90b865 AD |
84 | { |
85 | struct tc_bw_alloc *p; | |
9806307a JF |
86 | int min_credit; |
87 | int min_multiplier; | |
88 | int min_percent = 100; | |
2f90b865 AD |
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 | ||
9806307a JF |
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 | ||
2f90b865 AD |
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 | ||
9806307a JF |
141 | /* Calculate credit refill ratio using multiplier */ |
142 | credit_refill = min(link_percentage * min_multiplier, | |
143 | MAX_CREDIT_REFILL); | |
2f90b865 AD |
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 | */ | |
9806307a JF |
154 | if (credit_max && (credit_max < min_credit)) |
155 | credit_max = min_credit; | |
2f90b865 AD |
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 | */ | |
80ab193d JF |
164 | if ((hw->mac.type == ixgbe_mac_82598EB) && |
165 | credit_max && | |
2f90b865 AD |
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 | ||
176 | out: | |
177 | return ret_val; | |
178 | } | |
179 | ||
55320cb5 JF |
180 | void 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 | ||
189 | void 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 | ||
201 | void 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 | ||
209 | void 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 | ||
221 | void 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 | ||
2f90b865 AD |
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 | */ | |
240 | s32 ixgbe_dcb_hw_config(struct ixgbe_hw *hw, | |
241 | struct ixgbe_dcb_config *dcb_config) | |
242 | { | |
243 | s32 ret = 0; | |
55320cb5 JF |
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]; | |
17049d30 JF |
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}; | |
55320cb5 JF |
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 | ||
b93a2226 DS |
259 | switch (hw->mac.type) { |
260 | case ixgbe_mac_82598EB: | |
80605c65 JF |
261 | ret = ixgbe_dcb_hw_config_82598(hw, pfc_en, refill, max, |
262 | bwgid, ptype); | |
b93a2226 DS |
263 | break; |
264 | case ixgbe_mac_82599EB: | |
265 | case ixgbe_mac_X540: | |
80605c65 JF |
266 | ret = ixgbe_dcb_hw_config_82599(hw, pfc_en, refill, max, |
267 | bwgid, ptype, prio_tc); | |
b93a2226 DS |
268 | break; |
269 | default: | |
270 | break; | |
271 | } | |
2f90b865 AD |
272 | return ret; |
273 | } | |
274 | ||
d033d526 JF |
275 | /* Helper routines to abstract HW specifics from DCB netlink ops */ |
276 | s32 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 | ||
294 | s32 ixgbe_dcb_hw_ets_config(struct ixgbe_hw *hw, | |
17049d30 JF |
295 | u16 *refill, u16 *max, u8 *bwg_id, |
296 | u8 *prio_type, u8 *prio_tc) | |
d033d526 | 297 | { |
d033d526 JF |
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, | |
17049d30 | 310 | bwg_id, prio_type, prio_tc); |
d033d526 JF |
311 | ixgbe_dcb_config_tx_desc_arbiter_82599(hw, refill, max, |
312 | bwg_id, prio_type); | |
17049d30 JF |
313 | ixgbe_dcb_config_tx_data_arbiter_82599(hw, refill, max, bwg_id, |
314 | prio_type, prio_tc); | |
d033d526 JF |
315 | break; |
316 | default: | |
317 | break; | |
318 | } | |
319 | return 0; | |
320 | } |