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1 | /******************************************************************************* |
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 | ||
30 | #include "ixgbe.h" | |
31 | #include "ixgbe_type.h" | |
32 | #include "ixgbe_dcb.h" | |
33 | #include "ixgbe_dcb_82598.h" | |
34 | ||
35 | /** | |
36 | * ixgbe_dcb_config - Struct containing DCB settings. | |
37 | * @dcb_config: Pointer to DCB config structure | |
38 | * | |
39 | * This function checks DCB rules for DCB settings. | |
40 | * The following rules are checked: | |
41 | * 1. The sum of bandwidth percentages of all Bandwidth Groups must total 100%. | |
42 | * 2. The sum of bandwidth percentages of all Traffic Classes within a Bandwidth | |
43 | * Group must total 100. | |
44 | * 3. A Traffic Class should not be set to both Link Strict Priority | |
45 | * and Group Strict Priority. | |
46 | * 4. Link strict Bandwidth Groups can only have link strict traffic classes | |
47 | * with zero bandwidth. | |
48 | */ | |
49 | s32 ixgbe_dcb_check_config(struct ixgbe_dcb_config *dcb_config) | |
50 | { | |
51 | struct tc_bw_alloc *p; | |
52 | s32 ret_val = 0; | |
53 | u8 i, j, bw = 0, bw_id; | |
54 | u8 bw_sum[2][MAX_BW_GROUP]; | |
55 | bool link_strict[2][MAX_BW_GROUP]; | |
56 | ||
57 | memset(bw_sum, 0, sizeof(bw_sum)); | |
58 | memset(link_strict, 0, sizeof(link_strict)); | |
59 | ||
60 | /* First Tx, then Rx */ | |
61 | for (i = 0; i < 2; i++) { | |
62 | /* Check each traffic class for rule violation */ | |
63 | for (j = 0; j < MAX_TRAFFIC_CLASS; j++) { | |
64 | p = &dcb_config->tc_config[j].path[i]; | |
65 | ||
66 | bw = p->bwg_percent; | |
67 | bw_id = p->bwg_id; | |
68 | ||
69 | if (bw_id >= MAX_BW_GROUP) { | |
70 | ret_val = DCB_ERR_CONFIG; | |
71 | goto err_config; | |
72 | } | |
73 | if (p->prio_type == prio_link) { | |
74 | link_strict[i][bw_id] = true; | |
75 | /* Link strict should have zero bandwidth */ | |
76 | if (bw) { | |
77 | ret_val = DCB_ERR_LS_BW_NONZERO; | |
78 | goto err_config; | |
79 | } | |
80 | } else if (!bw) { | |
81 | /* | |
82 | * Traffic classes without link strict | |
83 | * should have non-zero bandwidth. | |
84 | */ | |
85 | ret_val = DCB_ERR_TC_BW_ZERO; | |
86 | goto err_config; | |
87 | } | |
88 | bw_sum[i][bw_id] += bw; | |
89 | } | |
90 | ||
91 | bw = 0; | |
92 | ||
93 | /* Check each bandwidth group for rule violation */ | |
94 | for (j = 0; j < MAX_BW_GROUP; j++) { | |
95 | bw += dcb_config->bw_percentage[i][j]; | |
96 | /* | |
97 | * Sum of bandwidth percentages of all traffic classes | |
98 | * within a Bandwidth Group must total 100 except for | |
99 | * link strict group (zero bandwidth). | |
100 | */ | |
101 | if (link_strict[i][j]) { | |
102 | if (bw_sum[i][j]) { | |
103 | /* | |
104 | * Link strict group should have zero | |
105 | * bandwidth. | |
106 | */ | |
107 | ret_val = DCB_ERR_LS_BWG_NONZERO; | |
108 | goto err_config; | |
109 | } | |
110 | } else if (bw_sum[i][j] != BW_PERCENT && | |
111 | bw_sum[i][j] != 0) { | |
112 | ret_val = DCB_ERR_TC_BW; | |
113 | goto err_config; | |
114 | } | |
115 | } | |
116 | ||
117 | if (bw != BW_PERCENT) { | |
118 | ret_val = DCB_ERR_BW_GROUP; | |
119 | goto err_config; | |
120 | } | |
121 | } | |
122 | ||
123 | err_config: | |
124 | return ret_val; | |
125 | } | |
126 | ||
127 | /** | |
128 | * ixgbe_dcb_calculate_tc_credits - Calculates traffic class credits | |
129 | * @ixgbe_dcb_config: Struct containing DCB settings. | |
130 | * @direction: Configuring either Tx or Rx. | |
131 | * | |
132 | * This function calculates the credits allocated to each traffic class. | |
133 | * It should be called only after the rules are checked by | |
134 | * ixgbe_dcb_check_config(). | |
135 | */ | |
136 | s32 ixgbe_dcb_calculate_tc_credits(struct ixgbe_dcb_config *dcb_config, | |
137 | u8 direction) | |
138 | { | |
139 | struct tc_bw_alloc *p; | |
140 | s32 ret_val = 0; | |
141 | /* Initialization values default for Tx settings */ | |
142 | u32 credit_refill = 0; | |
143 | u32 credit_max = 0; | |
144 | u16 link_percentage = 0; | |
145 | u8 bw_percent = 0; | |
146 | u8 i; | |
147 | ||
148 | if (dcb_config == NULL) { | |
149 | ret_val = DCB_ERR_CONFIG; | |
150 | goto out; | |
151 | } | |
152 | ||
153 | /* Find out the link percentage for each TC first */ | |
154 | for (i = 0; i < MAX_TRAFFIC_CLASS; i++) { | |
155 | p = &dcb_config->tc_config[i].path[direction]; | |
156 | bw_percent = dcb_config->bw_percentage[direction][p->bwg_id]; | |
157 | ||
158 | link_percentage = p->bwg_percent; | |
159 | /* Must be careful of integer division for very small nums */ | |
160 | link_percentage = (link_percentage * bw_percent) / 100; | |
161 | if (p->bwg_percent > 0 && link_percentage == 0) | |
162 | link_percentage = 1; | |
163 | ||
164 | /* Save link_percentage for reference */ | |
165 | p->link_percent = (u8)link_percentage; | |
166 | ||
167 | /* Calculate credit refill and save it */ | |
168 | credit_refill = link_percentage * MINIMUM_CREDIT_REFILL; | |
169 | p->data_credits_refill = (u16)credit_refill; | |
170 | ||
171 | /* Calculate maximum credit for the TC */ | |
172 | credit_max = (link_percentage * MAX_CREDIT) / 100; | |
173 | ||
174 | /* | |
175 | * Adjustment based on rule checking, if the percentage | |
176 | * of a TC is too small, the maximum credit may not be | |
177 | * enough to send out a jumbo frame in data plane arbitration. | |
178 | */ | |
179 | if (credit_max && (credit_max < MINIMUM_CREDIT_FOR_JUMBO)) | |
180 | credit_max = MINIMUM_CREDIT_FOR_JUMBO; | |
181 | ||
182 | if (direction == DCB_TX_CONFIG) { | |
183 | /* | |
184 | * Adjustment based on rule checking, if the | |
185 | * percentage of a TC is too small, the maximum | |
186 | * credit may not be enough to send out a TSO | |
187 | * packet in descriptor plane arbitration. | |
188 | */ | |
189 | if (credit_max && | |
190 | (credit_max < MINIMUM_CREDIT_FOR_TSO)) | |
191 | credit_max = MINIMUM_CREDIT_FOR_TSO; | |
192 | ||
193 | dcb_config->tc_config[i].desc_credits_max = | |
194 | (u16)credit_max; | |
195 | } | |
196 | ||
197 | p->data_credits_max = (u16)credit_max; | |
198 | } | |
199 | ||
200 | out: | |
201 | return ret_val; | |
202 | } | |
203 | ||
204 | /** | |
205 | * ixgbe_dcb_get_tc_stats - Returns status of each traffic class | |
206 | * @hw: pointer to hardware structure | |
207 | * @stats: pointer to statistics structure | |
208 | * @tc_count: Number of elements in bwg_array. | |
209 | * | |
210 | * This function returns the status data for each of the Traffic Classes in use. | |
211 | */ | |
212 | s32 ixgbe_dcb_get_tc_stats(struct ixgbe_hw *hw, struct ixgbe_hw_stats *stats, | |
213 | u8 tc_count) | |
214 | { | |
215 | s32 ret = 0; | |
216 | if (hw->mac.type == ixgbe_mac_82598EB) | |
217 | ret = ixgbe_dcb_get_tc_stats_82598(hw, stats, tc_count); | |
218 | return ret; | |
219 | } | |
220 | ||
221 | /** | |
222 | * ixgbe_dcb_get_pfc_stats - Returns CBFC status of each traffic class | |
223 | * hw - pointer to hardware structure | |
224 | * stats - pointer to statistics structure | |
225 | * tc_count - Number of elements in bwg_array. | |
226 | * | |
227 | * This function returns the CBFC status data for each of the Traffic Classes. | |
228 | */ | |
229 | s32 ixgbe_dcb_get_pfc_stats(struct ixgbe_hw *hw, struct ixgbe_hw_stats *stats, | |
230 | u8 tc_count) | |
231 | { | |
232 | s32 ret = 0; | |
233 | if (hw->mac.type == ixgbe_mac_82598EB) | |
234 | ret = ixgbe_dcb_get_pfc_stats_82598(hw, stats, tc_count); | |
235 | return ret; | |
236 | } | |
237 | ||
238 | /** | |
239 | * ixgbe_dcb_config_rx_arbiter - Config Rx arbiter | |
240 | * @hw: pointer to hardware structure | |
241 | * @dcb_config: pointer to ixgbe_dcb_config structure | |
242 | * | |
243 | * Configure Rx Data Arbiter and credits for each traffic class. | |
244 | */ | |
245 | s32 ixgbe_dcb_config_rx_arbiter(struct ixgbe_hw *hw, | |
246 | struct ixgbe_dcb_config *dcb_config) | |
247 | { | |
248 | s32 ret = 0; | |
249 | if (hw->mac.type == ixgbe_mac_82598EB) | |
250 | ret = ixgbe_dcb_config_rx_arbiter_82598(hw, dcb_config); | |
251 | return ret; | |
252 | } | |
253 | ||
254 | /** | |
255 | * ixgbe_dcb_config_tx_desc_arbiter - Config Tx Desc arbiter | |
256 | * @hw: pointer to hardware structure | |
257 | * @dcb_config: pointer to ixgbe_dcb_config structure | |
258 | * | |
259 | * Configure Tx Descriptor Arbiter and credits for each traffic class. | |
260 | */ | |
261 | s32 ixgbe_dcb_config_tx_desc_arbiter(struct ixgbe_hw *hw, | |
262 | struct ixgbe_dcb_config *dcb_config) | |
263 | { | |
264 | s32 ret = 0; | |
265 | if (hw->mac.type == ixgbe_mac_82598EB) | |
266 | ret = ixgbe_dcb_config_tx_desc_arbiter_82598(hw, dcb_config); | |
267 | return ret; | |
268 | } | |
269 | ||
270 | /** | |
271 | * ixgbe_dcb_config_tx_data_arbiter - Config Tx data arbiter | |
272 | * @hw: pointer to hardware structure | |
273 | * @dcb_config: pointer to ixgbe_dcb_config structure | |
274 | * | |
275 | * Configure Tx Data Arbiter and credits for each traffic class. | |
276 | */ | |
277 | s32 ixgbe_dcb_config_tx_data_arbiter(struct ixgbe_hw *hw, | |
278 | struct ixgbe_dcb_config *dcb_config) | |
279 | { | |
280 | s32 ret = 0; | |
281 | if (hw->mac.type == ixgbe_mac_82598EB) | |
282 | ret = ixgbe_dcb_config_tx_data_arbiter_82598(hw, dcb_config); | |
283 | return ret; | |
284 | } | |
285 | ||
286 | /** | |
287 | * ixgbe_dcb_config_pfc - Config priority flow control | |
288 | * @hw: pointer to hardware structure | |
289 | * @dcb_config: pointer to ixgbe_dcb_config structure | |
290 | * | |
291 | * Configure Priority Flow Control for each traffic class. | |
292 | */ | |
293 | s32 ixgbe_dcb_config_pfc(struct ixgbe_hw *hw, | |
294 | struct ixgbe_dcb_config *dcb_config) | |
295 | { | |
296 | s32 ret = 0; | |
297 | if (hw->mac.type == ixgbe_mac_82598EB) | |
298 | ret = ixgbe_dcb_config_pfc_82598(hw, dcb_config); | |
299 | return ret; | |
300 | } | |
301 | ||
302 | /** | |
303 | * ixgbe_dcb_config_tc_stats - Config traffic class statistics | |
304 | * @hw: pointer to hardware structure | |
305 | * | |
306 | * Configure queue statistics registers, all queues belonging to same traffic | |
307 | * class uses a single set of queue statistics counters. | |
308 | */ | |
309 | s32 ixgbe_dcb_config_tc_stats(struct ixgbe_hw *hw) | |
310 | { | |
311 | s32 ret = 0; | |
312 | if (hw->mac.type == ixgbe_mac_82598EB) | |
313 | ret = ixgbe_dcb_config_tc_stats_82598(hw); | |
314 | return ret; | |
315 | } | |
316 | ||
317 | /** | |
318 | * ixgbe_dcb_hw_config - Config and enable DCB | |
319 | * @hw: pointer to hardware structure | |
320 | * @dcb_config: pointer to ixgbe_dcb_config structure | |
321 | * | |
322 | * Configure dcb settings and enable dcb mode. | |
323 | */ | |
324 | s32 ixgbe_dcb_hw_config(struct ixgbe_hw *hw, | |
325 | struct ixgbe_dcb_config *dcb_config) | |
326 | { | |
327 | s32 ret = 0; | |
328 | if (hw->mac.type == ixgbe_mac_82598EB) | |
329 | ret = ixgbe_dcb_hw_config_82598(hw, dcb_config); | |
330 | return ret; | |
331 | } | |
332 |