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1 /*-
2  * Copyright (c) 2010-2011 Juniper Networks, Inc.
3  * All rights reserved.
4  *
5  * This software was developed by Robert N. M. Watson under contract
6  * to Juniper Networks, Inc.
7  *
8  * Redistribution and use in source and binary forms, with or without
9  * modification, are permitted provided that the following conditions
10  * are met:
11  * 1. Redistributions of source code must retain the above copyright
12  *    notice, this list of conditions and the following disclaimer.
13  * 2. Redistributions in binary form must reproduce the above copyright
14  *    notice, this list of conditions and the following disclaimer in the
15  *    documentation and/or other materials provided with the distribution.
16  *
17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27  * SUCH DAMAGE.
28  */
29
30 #include <sys/cdefs.h>
31
32 __FBSDID("$FreeBSD$");
33
34 #include <sys/param.h>
35 #include <sys/sysctl.h>
36
37 #include <sys/_lock.h>
38 #include <sys/_mutex.h>
39
40 #define _WANT_NETISR_INTERNAL
41 #include <net/netisr.h>
42 #include <net/netisr_internal.h>
43
44 #include <err.h>
45 #include <kvm.h>
46 #include <stdint.h>
47 #include <stdio.h>
48 #include <stdlib.h>
49 #include <stdbool.h>
50 #include <string.h>
51 #include <libxo/xo.h>
52 #include "netstat.h"
53
54 /*
55  * Print statistics for the kernel netisr subsystem.
56  */
57 static u_int                             bindthreads;
58 static u_int                             maxthreads;
59 static u_int                             numthreads;
60
61 static u_int                             defaultqlimit;
62 static u_int                             maxqlimit;
63
64 static char                              dispatch_policy[20];
65
66 static struct sysctl_netisr_proto       *proto_array;
67 static u_int                             proto_array_len;
68
69 static struct sysctl_netisr_workstream  *workstream_array;
70 static u_int                             workstream_array_len;
71
72 static struct sysctl_netisr_work        *work_array;
73 static u_int                             work_array_len;
74
75 static u_int                            *nws_array;
76
77 static u_int                             maxprot;
78
79 static void
80 netisr_dispatch_policy_to_string(u_int policy, char *buf,
81     size_t buflen)
82 {
83         const char *str;
84
85         switch (policy) {
86         case NETISR_DISPATCH_DEFAULT:
87                 str = "default";
88                 break;
89         case NETISR_DISPATCH_DEFERRED:
90                 str = "deferred";
91                 break;
92         case NETISR_DISPATCH_HYBRID:
93                 str = "hybrid";
94                 break;
95         case NETISR_DISPATCH_DIRECT:
96                 str = "direct";
97                 break;
98         default:
99                 str = "unknown";
100                 break;
101         }
102         snprintf(buf, buflen, "%s", str);
103 }
104
105 static void
106 netisr_load_kvm_uint(kvm_t *kd, const char *name, u_int *p)
107 {
108         struct nlist nl[] = {
109                 { .n_name = name },
110                 { .n_name = NULL },
111         };
112         int ret;
113
114         ret = kvm_nlist(kd, nl);
115         if (ret < 0)
116                 xo_errx(-1, "%s: kvm_nlist(%s): %s", __func__, name,
117                     kvm_geterr(kd));
118         if (ret != 0)
119                 xo_errx(-1, "%s: kvm_nlist(%s): unresolved symbol", __func__,
120                     name);
121         if (kvm_read(kd, nl[0].n_value, p, sizeof(*p)) != sizeof(*p))
122                 xo_errx(-1, "%s: kvm_read(%s): %s", __func__, name,
123                     kvm_geterr(kd));
124 }
125
126 /*
127  * Load a nul-terminated string from KVM up to 'limit', guarantee that the
128  * string in local memory is nul-terminated.
129  */
130 static void
131 netisr_load_kvm_string(kvm_t *kd, uintptr_t addr, char *dest, u_int limit)
132 {
133         u_int i;
134
135         for (i = 0; i < limit; i++) {
136                 if (kvm_read(kd, addr + i, &dest[i], sizeof(dest[i])) !=
137                     sizeof(dest[i]))
138                         xo_err(-1, "%s: kvm_read: %s", __func__,
139                             kvm_geterr(kd));
140                 if (dest[i] == '\0')
141                         break;
142         }
143         dest[limit - 1] = '\0';
144 }
145
146 static const char *
147 netisr_proto2name(u_int proto)
148 {
149         u_int i;
150
151         for (i = 0; i < proto_array_len; i++) {
152                 if (proto_array[i].snp_proto == proto)
153                         return (proto_array[i].snp_name);
154         }
155         return ("unknown");
156 }
157
158 static int
159 netisr_protoispresent(u_int proto)
160 {
161         u_int i;
162
163         for (i = 0; i < proto_array_len; i++) {
164                 if (proto_array[i].snp_proto == proto)
165                         return (1);
166         }
167         return (0);
168 }
169
170 static void
171 netisr_load_kvm_config(kvm_t *kd)
172 {
173         u_int tmp;
174
175         netisr_load_kvm_uint(kd, "_netisr_bindthreads", &bindthreads);
176         netisr_load_kvm_uint(kd, "_netisr_maxthreads", &maxthreads);
177         netisr_load_kvm_uint(kd, "_nws_count", &numthreads);
178
179         netisr_load_kvm_uint(kd, "_netisr_defaultqlimit", &defaultqlimit);
180         netisr_load_kvm_uint(kd, "_netisr_maxqlimit", &maxqlimit);
181
182         netisr_load_kvm_uint(kd, "_netisr_dispatch_policy", &tmp);
183         netisr_dispatch_policy_to_string(tmp, dispatch_policy,
184             sizeof(dispatch_policy));
185 }
186
187 static void
188 netisr_load_sysctl_uint(const char *name, u_int *p)
189 {
190         size_t retlen;
191
192         retlen = sizeof(u_int);
193         if (sysctlbyname(name, p, &retlen, NULL, 0) < 0)
194                 xo_err(-1, "%s", name);
195         if (retlen != sizeof(u_int))
196                 xo_errx(-1, "%s: invalid len %ju", name, (uintmax_t)retlen);
197 }
198
199 static void
200 netisr_load_sysctl_string(const char *name, char *p, size_t len)
201 {
202         size_t retlen;
203
204         retlen = len;
205         if (sysctlbyname(name, p, &retlen, NULL, 0) < 0)
206                 xo_err(-1, "%s", name);
207         p[len - 1] = '\0';
208 }
209
210 static void
211 netisr_load_sysctl_config(void)
212 {
213
214         netisr_load_sysctl_uint("net.isr.bindthreads", &bindthreads);
215         netisr_load_sysctl_uint("net.isr.maxthreads", &maxthreads);
216         netisr_load_sysctl_uint("net.isr.numthreads", &numthreads);
217
218         netisr_load_sysctl_uint("net.isr.defaultqlimit", &defaultqlimit);
219         netisr_load_sysctl_uint("net.isr.maxqlimit", &maxqlimit);
220
221         netisr_load_sysctl_string("net.isr.dispatch", dispatch_policy,
222             sizeof(dispatch_policy));
223 }
224
225 static void
226 netisr_load_kvm_proto(kvm_t *kd)
227 {
228         struct nlist nl[] = {
229 #define NLIST_NETISR_PROTO      0
230                 { .n_name = "_netisr_proto" },
231                 { .n_name = NULL },
232         };
233         struct netisr_proto *np_array, *npp;
234         u_int i, protocount;
235         struct sysctl_netisr_proto *snpp;
236         size_t len;
237         int ret;
238
239         /*
240          * Kernel compile-time and user compile-time definitions of
241          * NETISR_MAXPROT must match, as we use that to size work arrays.
242          */
243         netisr_load_kvm_uint(kd, "_netisr_maxprot", &maxprot);
244         if (maxprot != NETISR_MAXPROT)
245                 xo_errx(-1, "%s: NETISR_MAXPROT mismatch", __func__);
246         len = maxprot * sizeof(*np_array);
247         np_array = malloc(len);
248         if (np_array == NULL)
249                 xo_err(-1, "%s: malloc", __func__);
250         ret = kvm_nlist(kd, nl);
251         if (ret < 0)
252                 xo_errx(-1, "%s: kvm_nlist(_netisr_proto): %s", __func__,
253                     kvm_geterr(kd));
254         if (ret != 0)
255                 xo_errx(-1, "%s: kvm_nlist(_netisr_proto): unresolved symbol",
256                     __func__);
257         if (kvm_read(kd, nl[NLIST_NETISR_PROTO].n_value, np_array, len) !=
258             (ssize_t)len)
259                 xo_errx(-1, "%s: kvm_read(_netisr_proto): %s", __func__,
260                     kvm_geterr(kd));
261
262         /*
263          * Size and allocate memory to hold only live protocols.
264          */
265         protocount = 0;
266         for (i = 0; i < maxprot; i++) {
267                 if (np_array[i].np_name == NULL)
268                         continue;
269                 protocount++;
270         }
271         proto_array = calloc(protocount, sizeof(*proto_array));
272         if (proto_array == NULL)
273                 err(-1, "malloc");
274         protocount = 0;
275         for (i = 0; i < maxprot; i++) {
276                 npp = &np_array[i];
277                 if (npp->np_name == NULL)
278                         continue;
279                 snpp = &proto_array[protocount];
280                 snpp->snp_version = sizeof(*snpp);
281                 netisr_load_kvm_string(kd, (uintptr_t)npp->np_name,
282                     snpp->snp_name, sizeof(snpp->snp_name));
283                 snpp->snp_proto = i;
284                 snpp->snp_qlimit = npp->np_qlimit;
285                 snpp->snp_policy = npp->np_policy;
286                 snpp->snp_dispatch = npp->np_dispatch;
287                 if (npp->np_m2flow != NULL)
288                         snpp->snp_flags |= NETISR_SNP_FLAGS_M2FLOW;
289                 if (npp->np_m2cpuid != NULL)
290                         snpp->snp_flags |= NETISR_SNP_FLAGS_M2CPUID;
291                 if (npp->np_drainedcpu != NULL)
292                         snpp->snp_flags |= NETISR_SNP_FLAGS_DRAINEDCPU;
293                 protocount++;
294         }
295         proto_array_len = protocount;
296         free(np_array);
297 }
298
299 static void
300 netisr_load_sysctl_proto(void)
301 {
302         size_t len;
303
304         if (sysctlbyname("net.isr.proto", NULL, &len, NULL, 0) < 0)
305                 xo_err(-1, "net.isr.proto: query len");
306         if (len % sizeof(*proto_array) != 0)
307                 xo_errx(-1, "net.isr.proto: invalid len");
308         proto_array = malloc(len);
309         if (proto_array == NULL)
310                 xo_err(-1, "malloc");
311         if (sysctlbyname("net.isr.proto", proto_array, &len, NULL, 0) < 0)
312                 xo_err(-1, "net.isr.proto: query data");
313         if (len % sizeof(*proto_array) != 0)
314                 xo_errx(-1, "net.isr.proto: invalid len");
315         proto_array_len = len / sizeof(*proto_array);
316         if (proto_array_len < 1)
317                 xo_errx(-1, "net.isr.proto: no data");
318         if (proto_array[0].snp_version != sizeof(proto_array[0]))
319                 xo_errx(-1, "net.isr.proto: invalid version");
320 }
321
322 static void
323 netisr_load_kvm_workstream(kvm_t *kd)
324 {
325         struct nlist nl[] = {
326 #define NLIST_NWS_ARRAY         0
327                 { .n_name = "_nws_array" },
328                 { .n_name = NULL },
329         };
330         struct netisr_workstream nws;
331         struct sysctl_netisr_workstream *snwsp;
332         struct sysctl_netisr_work *snwp;
333         struct netisr_work *nwp;
334         struct nlist nl_nws[2];
335         u_int counter, cpuid, proto, wsid;
336         size_t len;
337         int ret;
338
339         len = numthreads * sizeof(*nws_array);
340         nws_array = malloc(len);
341         if (nws_array == NULL)
342                 xo_err(-1, "malloc");
343         ret = kvm_nlist(kd, nl);
344         if (ret < 0)
345                 xo_errx(-1, "%s: kvm_nlist: %s", __func__, kvm_geterr(kd));
346         if (ret != 0)
347                 xo_errx(-1, "%s: kvm_nlist: unresolved symbol", __func__);
348         if (kvm_read(kd, nl[NLIST_NWS_ARRAY].n_value, nws_array, len) !=
349             (ssize_t)len)
350                 xo_errx(-1, "%s: kvm_read(_nws_array): %s", __func__,
351                     kvm_geterr(kd));
352         workstream_array = calloc(numthreads, sizeof(*workstream_array));
353         if (workstream_array == NULL)
354                 xo_err(-1, "calloc");
355         workstream_array_len = numthreads;
356         work_array = calloc(numthreads * proto_array_len, sizeof(*work_array));
357         if (work_array == NULL)
358                 xo_err(-1, "calloc");
359         counter = 0;
360         for (wsid = 0; wsid < numthreads; wsid++) {
361                 cpuid = nws_array[wsid];
362                 if (kvm_dpcpu_setcpu(kd, cpuid) < 0)
363                         xo_errx(-1, "%s: kvm_dpcpu_setcpu(%u): %s", __func__,
364                             cpuid, kvm_geterr(kd));
365                 bzero(nl_nws, sizeof(nl_nws));
366                 nl_nws[0].n_name = "_nws";
367                 ret = kvm_nlist(kd, nl_nws);
368                 if (ret < 0)
369                         xo_errx(-1, "%s: kvm_nlist looking up nws on CPU "
370                             "%u: %s", __func__, cpuid, kvm_geterr(kd));
371                 if (ret != 0)
372                         xo_errx(-1, "%s: kvm_nlist(nws): unresolved symbol on "
373                             "CPU %u", __func__, cpuid);
374                 if (kvm_read(kd, nl_nws[0].n_value, &nws, sizeof(nws)) !=
375                     sizeof(nws))
376                         xo_errx(-1, "%s: kvm_read(nw): %s", __func__,
377                             kvm_geterr(kd));
378                 snwsp = &workstream_array[wsid];
379                 snwsp->snws_version = sizeof(*snwsp);
380                 snwsp->snws_wsid = cpuid;
381                 snwsp->snws_cpu = cpuid;
382                 if (nws.nws_intr_event != NULL)
383                         snwsp->snws_flags |= NETISR_SNWS_FLAGS_INTR;
384
385                 /*
386                  * Extract the CPU's per-protocol work information.
387                  */
388                 xo_emit("counting to maxprot: {:maxprot/%u}\n", maxprot);
389                 for (proto = 0; proto < maxprot; proto++) {
390                         if (!netisr_protoispresent(proto))
391                                 continue;
392                         nwp = &nws.nws_work[proto];
393                         snwp = &work_array[counter];
394                         snwp->snw_version = sizeof(*snwp);
395                         snwp->snw_wsid = cpuid;
396                         snwp->snw_proto = proto;
397                         snwp->snw_len = nwp->nw_len;
398                         snwp->snw_watermark = nwp->nw_watermark;
399                         snwp->snw_dispatched = nwp->nw_dispatched;
400                         snwp->snw_hybrid_dispatched =
401                             nwp->nw_hybrid_dispatched;
402                         snwp->snw_qdrops = nwp->nw_qdrops;
403                         snwp->snw_queued = nwp->nw_queued;
404                         snwp->snw_handled = nwp->nw_handled;
405                         counter++;
406                 }
407         }
408         work_array_len = counter;
409 }
410
411 static void
412 netisr_load_sysctl_workstream(void)
413 {
414         size_t len;
415
416         if (sysctlbyname("net.isr.workstream", NULL, &len, NULL, 0) < 0)
417                 xo_err(-1, "net.isr.workstream: query len");
418         if (len % sizeof(*workstream_array) != 0)
419                 xo_errx(-1, "net.isr.workstream: invalid len");
420         workstream_array = malloc(len);
421         if (workstream_array == NULL)
422                 xo_err(-1, "malloc");
423         if (sysctlbyname("net.isr.workstream", workstream_array, &len, NULL,
424             0) < 0)
425                 xo_err(-1, "net.isr.workstream: query data");
426         if (len % sizeof(*workstream_array) != 0)
427                 xo_errx(-1, "net.isr.workstream: invalid len");
428         workstream_array_len = len / sizeof(*workstream_array);
429         if (workstream_array_len < 1)
430                 xo_errx(-1, "net.isr.workstream: no data");
431         if (workstream_array[0].snws_version != sizeof(workstream_array[0]))
432                 xo_errx(-1, "net.isr.workstream: invalid version");
433 }
434
435 static void
436 netisr_load_sysctl_work(void)
437 {
438         size_t len;
439
440         if (sysctlbyname("net.isr.work", NULL, &len, NULL, 0) < 0)
441                 xo_err(-1, "net.isr.work: query len");
442         if (len % sizeof(*work_array) != 0)
443                 xo_errx(-1, "net.isr.work: invalid len");
444         work_array = malloc(len);
445         if (work_array == NULL)
446                 xo_err(-1, "malloc");
447         if (sysctlbyname("net.isr.work", work_array, &len, NULL, 0) < 0)
448                 xo_err(-1, "net.isr.work: query data");
449         if (len % sizeof(*work_array) != 0)
450                 xo_errx(-1, "net.isr.work: invalid len");
451         work_array_len = len / sizeof(*work_array);
452         if (work_array_len < 1)
453                 xo_errx(-1, "net.isr.work: no data");
454         if (work_array[0].snw_version != sizeof(work_array[0]))
455                 xo_errx(-1, "net.isr.work: invalid version");
456 }
457
458 static void
459 netisr_print_proto(struct sysctl_netisr_proto *snpp)
460 {
461         char tmp[20];
462
463         xo_emit("{[:-6}{k:name/%s}{]:}", snpp->snp_name);
464         xo_emit(" {:protocol/%5u}", snpp->snp_proto);
465         xo_emit(" {:queue-limit/%6u}", snpp->snp_qlimit);
466         xo_emit(" {:policy-type/%6s}",
467             (snpp->snp_policy == NETISR_POLICY_SOURCE) ?  "source" :
468             (snpp->snp_policy == NETISR_POLICY_FLOW) ? "flow" :
469             (snpp->snp_policy == NETISR_POLICY_CPU) ? "cpu" : "-");
470         netisr_dispatch_policy_to_string(snpp->snp_dispatch, tmp,
471             sizeof(tmp));
472         xo_emit(" {:policy/%8s}", tmp);
473         xo_emit("   {:flags/%s%s%s}\n",
474             (snpp->snp_flags & NETISR_SNP_FLAGS_M2CPUID) ?  "C" : "-",
475             (snpp->snp_flags & NETISR_SNP_FLAGS_DRAINEDCPU) ?  "D" : "-",
476             (snpp->snp_flags & NETISR_SNP_FLAGS_M2FLOW) ? "F" : "-");
477 }
478
479 static void
480 netisr_print_workstream(struct sysctl_netisr_workstream *snwsp)
481 {
482         struct sysctl_netisr_work *snwp;
483         u_int i;
484
485         xo_open_list("work");
486         for (i = 0; i < work_array_len; i++) {
487                 snwp = &work_array[i];
488                 if (snwp->snw_wsid != snwsp->snws_wsid)
489                         continue;
490                 xo_open_instance("work");
491                 xo_emit("{t:workstream/%4u} ", snwsp->snws_wsid);
492                 xo_emit("{t:cpu/%3u} ", snwsp->snws_cpu);
493                 xo_emit("{P:  }");
494                 xo_emit("{t:name/%-6s}", netisr_proto2name(snwp->snw_proto));
495                 xo_emit(" {t:length/%5u}", snwp->snw_len);
496                 xo_emit(" {t:watermark/%5u}", snwp->snw_watermark);
497                 xo_emit(" {t:dispatched/%8ju}", snwp->snw_dispatched);
498                 xo_emit(" {t:hybrid-dispatched/%8ju}",
499                     snwp->snw_hybrid_dispatched);
500                 xo_emit(" {t:queue-drops/%8ju}", snwp->snw_qdrops);
501                 xo_emit(" {t:queued/%8ju}", snwp->snw_queued);
502                 xo_emit(" {t:handled/%8ju}", snwp->snw_handled);
503                 xo_emit("\n");
504                 xo_close_instance("work");
505         }
506         xo_close_list("work");
507 }
508
509 void
510 netisr_stats(void *kvmd)
511 {
512         struct sysctl_netisr_workstream *snwsp;
513         struct sysctl_netisr_proto *snpp;
514         kvm_t *kd = kvmd;
515         u_int i;
516
517         if (live) {
518                 netisr_load_sysctl_config();
519                 netisr_load_sysctl_proto();
520                 netisr_load_sysctl_workstream();
521                 netisr_load_sysctl_work();
522         } else {
523                 if (kd == NULL)
524                         xo_errx(-1, "netisr_stats: !live but !kd");
525                 netisr_load_kvm_config(kd);
526                 netisr_load_kvm_proto(kd);
527                 netisr_load_kvm_workstream(kd);         /* Also does work. */
528         }
529
530         xo_open_container("netisr");
531
532         xo_emit("{T:Configuration}:\n");
533         xo_emit("{T:/%-25s} {T:/%12s} {T:/%12s}\n",
534             "Setting", "Current", "Limit");
535         xo_emit("{T:/%-25s} {T:/%12u} {T:/%12u}\n",
536             "Thread count", numthreads, maxthreads);
537         xo_emit("{T:/%-25s} {T:/%12u} {T:/%12u}\n",
538             "Default queue limit", defaultqlimit, maxqlimit);
539         xo_emit("{T:/%-25s} {T:/%12s} {T:/%12s}\n",
540             "Dispatch policy", dispatch_policy, "n/a");
541         xo_emit("{T:/%-25s} {T:/%12s} {T:/%12s}\n",
542             "Threads bound to CPUs", bindthreads ? "enabled" : "disabled",
543             "n/a");
544         xo_emit("\n");
545
546         xo_emit("{T:Protocols}:\n");
547         xo_emit("{T:/%-6s} {T:/%5s} {T:/%6s} {T:/%-6s} {T:/%-8s} {T:/%-5s}\n",
548             "Name", "Proto", "QLimit", "Policy", "Dispatch", "Flags");
549         xo_open_list("protocol");
550         for (i = 0; i < proto_array_len; i++) {
551                 xo_open_instance("protocol");
552                 snpp = &proto_array[i];
553                 netisr_print_proto(snpp);
554                 xo_close_instance("protocol");
555         }
556         xo_close_list("protocol");
557         xo_emit("\n");
558
559         xo_emit("{T:Workstreams}:\n");
560         xo_emit("{T:/%4s} {T:/%3s} ", "WSID", "CPU");
561         xo_emit("{P:/%2s}", "");
562         xo_emit("{T:/%-6s} {T:/%5s} {T:/%5s} {T:/%8s} {T:/%8s} {T:/%8s} "
563             "{T:/%8s} {T:/%8s}\n",
564             "Name", "Len", "WMark", "Disp'd", "HDisp'd", "QDrops", "Queued",
565             "Handled");
566         xo_open_list("workstream");
567         for (i = 0; i < workstream_array_len; i++) {
568                 xo_open_instance("workstream");
569                 snwsp = &workstream_array[i];
570                 netisr_print_workstream(snwsp);
571                 xo_close_instance("workstream");
572         }
573         xo_close_list("workstream");
574         xo_close_container("netisr");
575 }