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1/*
2 * Copyright (c) 2013-2017, Mellanox Technologies. All rights reserved.
3 *
4 * This software is available to you under a choice of one of two
5 * licenses. You may choose to be licensed under the terms of the GNU
6 * General Public License (GPL) Version 2, available from the file
7 * COPYING in the main directory of this source tree, or the
8 * OpenIB.org BSD license below:
9 *
10 * Redistribution and use in source and binary forms, with or
11 * without modification, are permitted provided that the following
12 * conditions are met:
13 *
14 * - Redistributions of source code must retain the above
15 * copyright notice, this list of conditions and the following
16 * disclaimer.
17 *
18 * - Redistributions in binary form must reproduce the above
19 * copyright notice, this list of conditions and the following
20 * disclaimer in the documentation and/or other materials
21 * provided with the distribution.
22 *
23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
30 * SOFTWARE.
31 */
32
33#include <linux/debugfs.h>
34
35#include "mlx5_ib.h"
36#include "cmd.h"
37
38enum mlx5_ib_cong_node_type {
39 MLX5_IB_RROCE_ECN_RP = 1,
40 MLX5_IB_RROCE_ECN_NP = 2,
41};
42
43static const char * const mlx5_ib_dbg_cc_name[] = {
44 "rp_clamp_tgt_rate",
45 "rp_clamp_tgt_rate_ati",
46 "rp_time_reset",
47 "rp_byte_reset",
48 "rp_threshold",
49 "rp_ai_rate",
50 "rp_max_rate",
51 "rp_hai_rate",
52 "rp_min_dec_fac",
53 "rp_min_rate",
54 "rp_rate_to_set_on_first_cnp",
55 "rp_dce_tcp_g",
56 "rp_dce_tcp_rtt",
57 "rp_rate_reduce_monitor_period",
58 "rp_initial_alpha_value",
59 "rp_gd",
60 "np_min_time_between_cnps",
61 "np_cnp_dscp",
62 "np_cnp_prio_mode",
63 "np_cnp_prio",
64};
65
66#define MLX5_IB_RP_CLAMP_TGT_RATE_ATTR BIT(1)
67#define MLX5_IB_RP_CLAMP_TGT_RATE_ATI_ATTR BIT(2)
68#define MLX5_IB_RP_TIME_RESET_ATTR BIT(3)
69#define MLX5_IB_RP_BYTE_RESET_ATTR BIT(4)
70#define MLX5_IB_RP_THRESHOLD_ATTR BIT(5)
71#define MLX5_IB_RP_MAX_RATE_ATTR BIT(6)
72#define MLX5_IB_RP_AI_RATE_ATTR BIT(7)
73#define MLX5_IB_RP_HAI_RATE_ATTR BIT(8)
74#define MLX5_IB_RP_MIN_DEC_FAC_ATTR BIT(9)
75#define MLX5_IB_RP_MIN_RATE_ATTR BIT(10)
76#define MLX5_IB_RP_RATE_TO_SET_ON_FIRST_CNP_ATTR BIT(11)
77#define MLX5_IB_RP_DCE_TCP_G_ATTR BIT(12)
78#define MLX5_IB_RP_DCE_TCP_RTT_ATTR BIT(13)
79#define MLX5_IB_RP_RATE_REDUCE_MONITOR_PERIOD_ATTR BIT(14)
80#define MLX5_IB_RP_INITIAL_ALPHA_VALUE_ATTR BIT(15)
81#define MLX5_IB_RP_GD_ATTR BIT(16)
82
83#define MLX5_IB_NP_MIN_TIME_BETWEEN_CNPS_ATTR BIT(2)
84#define MLX5_IB_NP_CNP_DSCP_ATTR BIT(3)
85#define MLX5_IB_NP_CNP_PRIO_MODE_ATTR BIT(4)
86
87static enum mlx5_ib_cong_node_type
88mlx5_ib_param_to_node(enum mlx5_ib_dbg_cc_types param_offset)
89{
90 if (param_offset >= MLX5_IB_DBG_CC_RP_CLAMP_TGT_RATE &&
91 param_offset <= MLX5_IB_DBG_CC_RP_GD)
92 return MLX5_IB_RROCE_ECN_RP;
93 else
94 return MLX5_IB_RROCE_ECN_NP;
95}
96
97static u32 mlx5_get_cc_param_val(void *field, int offset)
98{
99 switch (offset) {
100 case MLX5_IB_DBG_CC_RP_CLAMP_TGT_RATE:
101 return MLX5_GET(cong_control_r_roce_ecn_rp, field,
102 clamp_tgt_rate);
103 case MLX5_IB_DBG_CC_RP_CLAMP_TGT_RATE_ATI:
104 return MLX5_GET(cong_control_r_roce_ecn_rp, field,
105 clamp_tgt_rate_after_time_inc);
106 case MLX5_IB_DBG_CC_RP_TIME_RESET:
107 return MLX5_GET(cong_control_r_roce_ecn_rp, field,
108 rpg_time_reset);
109 case MLX5_IB_DBG_CC_RP_BYTE_RESET:
110 return MLX5_GET(cong_control_r_roce_ecn_rp, field,
111 rpg_byte_reset);
112 case MLX5_IB_DBG_CC_RP_THRESHOLD:
113 return MLX5_GET(cong_control_r_roce_ecn_rp, field,
114 rpg_threshold);
115 case MLX5_IB_DBG_CC_RP_AI_RATE:
116 return MLX5_GET(cong_control_r_roce_ecn_rp, field,
117 rpg_ai_rate);
118 case MLX5_IB_DBG_CC_RP_MAX_RATE:
119 return MLX5_GET(cong_control_r_roce_ecn_rp, field,
120 rpg_max_rate);
121 case MLX5_IB_DBG_CC_RP_HAI_RATE:
122 return MLX5_GET(cong_control_r_roce_ecn_rp, field,
123 rpg_hai_rate);
124 case MLX5_IB_DBG_CC_RP_MIN_DEC_FAC:
125 return MLX5_GET(cong_control_r_roce_ecn_rp, field,
126 rpg_min_dec_fac);
127 case MLX5_IB_DBG_CC_RP_MIN_RATE:
128 return MLX5_GET(cong_control_r_roce_ecn_rp, field,
129 rpg_min_rate);
130 case MLX5_IB_DBG_CC_RP_RATE_TO_SET_ON_FIRST_CNP:
131 return MLX5_GET(cong_control_r_roce_ecn_rp, field,
132 rate_to_set_on_first_cnp);
133 case MLX5_IB_DBG_CC_RP_DCE_TCP_G:
134 return MLX5_GET(cong_control_r_roce_ecn_rp, field,
135 dce_tcp_g);
136 case MLX5_IB_DBG_CC_RP_DCE_TCP_RTT:
137 return MLX5_GET(cong_control_r_roce_ecn_rp, field,
138 dce_tcp_rtt);
139 case MLX5_IB_DBG_CC_RP_RATE_REDUCE_MONITOR_PERIOD:
140 return MLX5_GET(cong_control_r_roce_ecn_rp, field,
141 rate_reduce_monitor_period);
142 case MLX5_IB_DBG_CC_RP_INITIAL_ALPHA_VALUE:
143 return MLX5_GET(cong_control_r_roce_ecn_rp, field,
144 initial_alpha_value);
145 case MLX5_IB_DBG_CC_RP_GD:
146 return MLX5_GET(cong_control_r_roce_ecn_rp, field,
147 rpg_gd);
148 case MLX5_IB_DBG_CC_NP_MIN_TIME_BETWEEN_CNPS:
149 return MLX5_GET(cong_control_r_roce_ecn_np, field,
150 min_time_between_cnps);
151 case MLX5_IB_DBG_CC_NP_CNP_DSCP:
152 return MLX5_GET(cong_control_r_roce_ecn_np, field,
153 cnp_dscp);
154 case MLX5_IB_DBG_CC_NP_CNP_PRIO_MODE:
155 return MLX5_GET(cong_control_r_roce_ecn_np, field,
156 cnp_prio_mode);
157 case MLX5_IB_DBG_CC_NP_CNP_PRIO:
158 return MLX5_GET(cong_control_r_roce_ecn_np, field,
159 cnp_802p_prio);
160 default:
161 return 0;
162 }
163}
164
165static void mlx5_ib_set_cc_param_mask_val(void *field, int offset,
166 u32 var, u32 *attr_mask)
167{
168 switch (offset) {
169 case MLX5_IB_DBG_CC_RP_CLAMP_TGT_RATE:
170 *attr_mask |= MLX5_IB_RP_CLAMP_TGT_RATE_ATTR;
171 MLX5_SET(cong_control_r_roce_ecn_rp, field,
172 clamp_tgt_rate, var);
173 break;
174 case MLX5_IB_DBG_CC_RP_CLAMP_TGT_RATE_ATI:
175 *attr_mask |= MLX5_IB_RP_CLAMP_TGT_RATE_ATI_ATTR;
176 MLX5_SET(cong_control_r_roce_ecn_rp, field,
177 clamp_tgt_rate_after_time_inc, var);
178 break;
179 case MLX5_IB_DBG_CC_RP_TIME_RESET:
180 *attr_mask |= MLX5_IB_RP_TIME_RESET_ATTR;
181 MLX5_SET(cong_control_r_roce_ecn_rp, field,
182 rpg_time_reset, var);
183 break;
184 case MLX5_IB_DBG_CC_RP_BYTE_RESET:
185 *attr_mask |= MLX5_IB_RP_BYTE_RESET_ATTR;
186 MLX5_SET(cong_control_r_roce_ecn_rp, field,
187 rpg_byte_reset, var);
188 break;
189 case MLX5_IB_DBG_CC_RP_THRESHOLD:
190 *attr_mask |= MLX5_IB_RP_THRESHOLD_ATTR;
191 MLX5_SET(cong_control_r_roce_ecn_rp, field,
192 rpg_threshold, var);
193 break;
194 case MLX5_IB_DBG_CC_RP_AI_RATE:
195 *attr_mask |= MLX5_IB_RP_AI_RATE_ATTR;
196 MLX5_SET(cong_control_r_roce_ecn_rp, field,
197 rpg_ai_rate, var);
198 break;
199 case MLX5_IB_DBG_CC_RP_MAX_RATE:
200 *attr_mask |= MLX5_IB_RP_MAX_RATE_ATTR;
201 MLX5_SET(cong_control_r_roce_ecn_rp, field,
202 rpg_max_rate, var);
203 break;
204 case MLX5_IB_DBG_CC_RP_HAI_RATE:
205 *attr_mask |= MLX5_IB_RP_HAI_RATE_ATTR;
206 MLX5_SET(cong_control_r_roce_ecn_rp, field,
207 rpg_hai_rate, var);
208 break;
209 case MLX5_IB_DBG_CC_RP_MIN_DEC_FAC:
210 *attr_mask |= MLX5_IB_RP_MIN_DEC_FAC_ATTR;
211 MLX5_SET(cong_control_r_roce_ecn_rp, field,
212 rpg_min_dec_fac, var);
213 break;
214 case MLX5_IB_DBG_CC_RP_MIN_RATE:
215 *attr_mask |= MLX5_IB_RP_MIN_RATE_ATTR;
216 MLX5_SET(cong_control_r_roce_ecn_rp, field,
217 rpg_min_rate, var);
218 break;
219 case MLX5_IB_DBG_CC_RP_RATE_TO_SET_ON_FIRST_CNP:
220 *attr_mask |= MLX5_IB_RP_RATE_TO_SET_ON_FIRST_CNP_ATTR;
221 MLX5_SET(cong_control_r_roce_ecn_rp, field,
222 rate_to_set_on_first_cnp, var);
223 break;
224 case MLX5_IB_DBG_CC_RP_DCE_TCP_G:
225 *attr_mask |= MLX5_IB_RP_DCE_TCP_G_ATTR;
226 MLX5_SET(cong_control_r_roce_ecn_rp, field,
227 dce_tcp_g, var);
228 break;
229 case MLX5_IB_DBG_CC_RP_DCE_TCP_RTT:
230 *attr_mask |= MLX5_IB_RP_DCE_TCP_RTT_ATTR;
231 MLX5_SET(cong_control_r_roce_ecn_rp, field,
232 dce_tcp_rtt, var);
233 break;
234 case MLX5_IB_DBG_CC_RP_RATE_REDUCE_MONITOR_PERIOD:
235 *attr_mask |= MLX5_IB_RP_RATE_REDUCE_MONITOR_PERIOD_ATTR;
236 MLX5_SET(cong_control_r_roce_ecn_rp, field,
237 rate_reduce_monitor_period, var);
238 break;
239 case MLX5_IB_DBG_CC_RP_INITIAL_ALPHA_VALUE:
240 *attr_mask |= MLX5_IB_RP_INITIAL_ALPHA_VALUE_ATTR;
241 MLX5_SET(cong_control_r_roce_ecn_rp, field,
242 initial_alpha_value, var);
243 break;
244 case MLX5_IB_DBG_CC_RP_GD:
245 *attr_mask |= MLX5_IB_RP_GD_ATTR;
246 MLX5_SET(cong_control_r_roce_ecn_rp, field,
247 rpg_gd, var);
248 break;
249 case MLX5_IB_DBG_CC_NP_MIN_TIME_BETWEEN_CNPS:
250 *attr_mask |= MLX5_IB_NP_MIN_TIME_BETWEEN_CNPS_ATTR;
251 MLX5_SET(cong_control_r_roce_ecn_np, field,
252 min_time_between_cnps, var);
253 break;
254 case MLX5_IB_DBG_CC_NP_CNP_DSCP:
255 *attr_mask |= MLX5_IB_NP_CNP_DSCP_ATTR;
256 MLX5_SET(cong_control_r_roce_ecn_np, field, cnp_dscp, var);
257 break;
258 case MLX5_IB_DBG_CC_NP_CNP_PRIO_MODE:
259 *attr_mask |= MLX5_IB_NP_CNP_PRIO_MODE_ATTR;
260 MLX5_SET(cong_control_r_roce_ecn_np, field, cnp_prio_mode, var);
261 break;
262 case MLX5_IB_DBG_CC_NP_CNP_PRIO:
263 *attr_mask |= MLX5_IB_NP_CNP_PRIO_MODE_ATTR;
264 MLX5_SET(cong_control_r_roce_ecn_np, field, cnp_prio_mode, 0);
265 MLX5_SET(cong_control_r_roce_ecn_np, field, cnp_802p_prio, var);
266 break;
267 }
268}
269
270static int mlx5_ib_get_cc_params(struct mlx5_ib_dev *dev, u32 port_num,
271 int offset, u32 *var)
272{
273 int outlen = MLX5_ST_SZ_BYTES(query_cong_params_out);
274 void *out;
275 void *field;
276 int err;
277 enum mlx5_ib_cong_node_type node;
278 struct mlx5_core_dev *mdev;
279
280 /* Takes a 1-based port number */
281 mdev = mlx5_ib_get_native_port_mdev(dev, port_num + 1, NULL);
282 if (!mdev)
283 return -ENODEV;
284
285 out = kvzalloc(outlen, GFP_KERNEL);
286 if (!out) {
287 err = -ENOMEM;
288 goto alloc_err;
289 }
290
291 node = mlx5_ib_param_to_node(offset);
292
293 err = mlx5_cmd_query_cong_params(mdev, node, out);
294 if (err)
295 goto free;
296
297 field = MLX5_ADDR_OF(query_cong_params_out, out, congestion_parameters);
298 *var = mlx5_get_cc_param_val(field, offset);
299
300free:
301 kvfree(out);
302alloc_err:
303 mlx5_ib_put_native_port_mdev(dev, port_num + 1);
304 return err;
305}
306
307static int mlx5_ib_set_cc_params(struct mlx5_ib_dev *dev, u32 port_num,
308 int offset, u32 var)
309{
310 int inlen = MLX5_ST_SZ_BYTES(modify_cong_params_in);
311 void *in;
312 void *field;
313 enum mlx5_ib_cong_node_type node;
314 struct mlx5_core_dev *mdev;
315 u32 attr_mask = 0;
316 int err;
317
318 /* Takes a 1-based port number */
319 mdev = mlx5_ib_get_native_port_mdev(dev, port_num + 1, NULL);
320 if (!mdev)
321 return -ENODEV;
322
323 in = kvzalloc(inlen, GFP_KERNEL);
324 if (!in) {
325 err = -ENOMEM;
326 goto alloc_err;
327 }
328
329 MLX5_SET(modify_cong_params_in, in, opcode,
330 MLX5_CMD_OP_MODIFY_CONG_PARAMS);
331
332 node = mlx5_ib_param_to_node(offset);
333 MLX5_SET(modify_cong_params_in, in, cong_protocol, node);
334
335 field = MLX5_ADDR_OF(modify_cong_params_in, in, congestion_parameters);
336 mlx5_ib_set_cc_param_mask_val(field, offset, var, &attr_mask);
337
338 field = MLX5_ADDR_OF(modify_cong_params_in, in, field_select);
339 MLX5_SET(field_select_r_roce_rp, field, field_select_r_roce_rp,
340 attr_mask);
341
342 err = mlx5_cmd_exec_in(dev->mdev, modify_cong_params, in);
343 kvfree(in);
344alloc_err:
345 mlx5_ib_put_native_port_mdev(dev, port_num + 1);
346 return err;
347}
348
349static ssize_t set_param(struct file *filp, const char __user *buf,
350 size_t count, loff_t *pos)
351{
352 struct mlx5_ib_dbg_param *param = filp->private_data;
353 int offset = param->offset;
354 char lbuf[11] = { };
355 u32 var;
356 int ret;
357
358 if (count > sizeof(lbuf))
359 return -EINVAL;
360
361 if (copy_from_user(lbuf, buf, count))
362 return -EFAULT;
363
364 lbuf[sizeof(lbuf) - 1] = '\0';
365
366 if (kstrtou32(lbuf, 0, &var))
367 return -EINVAL;
368
369 ret = mlx5_ib_set_cc_params(param->dev, param->port_num, offset, var);
370 return ret ? ret : count;
371}
372
373static ssize_t get_param(struct file *filp, char __user *buf, size_t count,
374 loff_t *pos)
375{
376 struct mlx5_ib_dbg_param *param = filp->private_data;
377 int offset = param->offset;
378 u32 var = 0;
379 int ret;
380 char lbuf[11];
381
382 ret = mlx5_ib_get_cc_params(param->dev, param->port_num, offset, &var);
383 if (ret)
384 return ret;
385
386 ret = snprintf(lbuf, sizeof(lbuf), "%d\n", var);
387 if (ret < 0)
388 return ret;
389
390 return simple_read_from_buffer(buf, count, pos, lbuf, ret);
391}
392
393static const struct file_operations dbg_cc_fops = {
394 .owner = THIS_MODULE,
395 .open = simple_open,
396 .write = set_param,
397 .read = get_param,
398};
399
400void mlx5_ib_cleanup_cong_debugfs(struct mlx5_ib_dev *dev, u32 port_num)
401{
402 if (!mlx5_debugfs_root ||
403 !dev->port[port_num].dbg_cc_params ||
404 !dev->port[port_num].dbg_cc_params->root)
405 return;
406
407 debugfs_remove_recursive(dev->port[port_num].dbg_cc_params->root);
408 kfree(dev->port[port_num].dbg_cc_params);
409 dev->port[port_num].dbg_cc_params = NULL;
410}
411
412void mlx5_ib_init_cong_debugfs(struct mlx5_ib_dev *dev, u32 port_num)
413{
414 struct mlx5_ib_dbg_cc_params *dbg_cc_params;
415 struct mlx5_core_dev *mdev;
416 int i;
417
418 if (!mlx5_debugfs_root)
419 return;
420
421 /* Takes a 1-based port number */
422 mdev = mlx5_ib_get_native_port_mdev(dev, port_num + 1, NULL);
423 if (!mdev)
424 return;
425
426 if (!MLX5_CAP_GEN(mdev, cc_query_allowed) ||
427 !MLX5_CAP_GEN(mdev, cc_modify_allowed))
428 goto put_mdev;
429
430 dbg_cc_params = kzalloc(sizeof(*dbg_cc_params), GFP_KERNEL);
431 if (!dbg_cc_params)
432 goto err;
433
434 dev->port[port_num].dbg_cc_params = dbg_cc_params;
435
436 dbg_cc_params->root = debugfs_create_dir("cc_params", mlx5_debugfs_get_dev_root(mdev));
437
438 for (i = 0; i < MLX5_IB_DBG_CC_MAX; i++) {
439 dbg_cc_params->params[i].offset = i;
440 dbg_cc_params->params[i].dev = dev;
441 dbg_cc_params->params[i].port_num = port_num;
442 dbg_cc_params->params[i].dentry =
443 debugfs_create_file(mlx5_ib_dbg_cc_name[i],
444 0600, dbg_cc_params->root,
445 &dbg_cc_params->params[i],
446 &dbg_cc_fops);
447 }
448
449put_mdev:
450 mlx5_ib_put_native_port_mdev(dev, port_num + 1);
451 return;
452
453err:
454 mlx5_ib_warn(dev, "cong debugfs failure\n");
455 mlx5_ib_cleanup_cong_debugfs(dev, port_num);
456 mlx5_ib_put_native_port_mdev(dev, port_num + 1);
457
458 /*
459 * We don't want to fail driver if debugfs failed to initialize,
460 * so we are not forwarding error to the user.
461 */
462 return;
463}