| 1 | /*- |
| 2 | * Copyright (c) 2001-2002 Luigi Rizzo |
| 3 | * |
| 4 | * Supported by: the Xorp Project (www.xorp.org) |
| 5 | * |
| 6 | * Redistribution and use in source and binary forms, with or without |
| 7 | * modification, are permitted provided that the following conditions |
| 8 | * are met: |
| 9 | * 1. Redistributions of source code must retain the above copyright |
| 10 | * notice, this list of conditions and the following disclaimer. |
| 11 | * 2. Redistributions in binary form must reproduce the above copyright |
| 12 | * notice, this list of conditions and the following disclaimer in the |
| 13 | * documentation and/or other materials provided with the distribution. |
| 14 | * |
| 15 | * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND |
| 16 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 17 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 18 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE |
| 19 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 20 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 21 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 22 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 23 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 24 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 25 | * SUCH DAMAGE. |
| 26 | * |
| 27 | * $FreeBSD: src/sys/kern/kern_poll.c,v 1.2.2.4 2002/06/27 23:26:33 luigi Exp $ |
| 28 | * $DragonFly: src/sys/kern/kern_poll.c,v 1.48 2008/09/24 12:07:19 sephe Exp $ |
| 29 | */ |
| 30 | |
| 31 | #include "opt_polling.h" |
| 32 | |
| 33 | #include <sys/param.h> |
| 34 | #include <sys/kernel.h> |
| 35 | #include <sys/ktr.h> |
| 36 | #include <sys/socket.h> /* needed by net/if.h */ |
| 37 | #include <sys/sysctl.h> |
| 38 | |
| 39 | #include <sys/thread2.h> |
| 40 | #include <sys/msgport2.h> |
| 41 | |
| 42 | #include <net/if.h> /* for IFF_* flags */ |
| 43 | #include <net/netmsg2.h> |
| 44 | |
| 45 | /* |
| 46 | * Polling support for [network] device drivers. |
| 47 | * |
| 48 | * Drivers which support this feature try to register with the |
| 49 | * polling code. |
| 50 | * |
| 51 | * If registration is successful, the driver must disable interrupts, |
| 52 | * and further I/O is performed through the handler, which is invoked |
| 53 | * (at least once per clock tick) with 3 arguments: the "arg" passed at |
| 54 | * register time (a struct ifnet pointer), a command, and a "count" limit. |
| 55 | * |
| 56 | * The command can be one of the following: |
| 57 | * POLL_ONLY: quick move of "count" packets from input/output queues. |
| 58 | * POLL_AND_CHECK_STATUS: as above, plus check status registers or do |
| 59 | * other more expensive operations. This command is issued periodically |
| 60 | * but less frequently than POLL_ONLY. |
| 61 | * POLL_DEREGISTER: deregister and return to interrupt mode. |
| 62 | * POLL_REGISTER: register and disable interrupts |
| 63 | * |
| 64 | * The first two commands are only issued if the interface is marked as |
| 65 | * 'IFF_UP, IFF_RUNNING and IFF_POLLING', the last two only if IFF_RUNNING |
| 66 | * is set. |
| 67 | * |
| 68 | * The count limit specifies how much work the handler can do during the |
| 69 | * call -- typically this is the number of packets to be received, or |
| 70 | * transmitted, etc. (drivers are free to interpret this number, as long |
| 71 | * as the max time spent in the function grows roughly linearly with the |
| 72 | * count). |
| 73 | * |
| 74 | * Deregistration can be requested by the driver itself (typically in the |
| 75 | * *_stop() routine), or by the polling code, by invoking the handler. |
| 76 | * |
| 77 | * Polling can be enabled or disabled on particular CPU_X with the sysctl |
| 78 | * variable kern.polling.X.enable (default is 1, enabled) |
| 79 | * |
| 80 | * A second variable controls the sharing of CPU between polling/kernel |
| 81 | * network processing, and other activities (typically userlevel tasks): |
| 82 | * kern.polling.X.user_frac (between 0 and 100, default 50) sets the share |
| 83 | * of CPU allocated to user tasks. CPU is allocated proportionally to the |
| 84 | * shares, by dynamically adjusting the "count" (poll_burst). |
| 85 | * |
| 86 | * Other parameters can should be left to their default values. |
| 87 | * The following constraints hold |
| 88 | * |
| 89 | * 1 <= poll_burst <= poll_burst_max |
| 90 | * 1 <= poll_each_burst <= poll_burst_max |
| 91 | * MIN_POLL_BURST_MAX <= poll_burst_max <= MAX_POLL_BURST_MAX |
| 92 | */ |
| 93 | |
| 94 | #define MIN_POLL_BURST_MAX 10 |
| 95 | #define MAX_POLL_BURST_MAX 1000 |
| 96 | #define POLL_BURST_MAX 150 /* good for 100Mbit net and HZ=1000 */ |
| 97 | #define POLL_EACH_BURST 5 |
| 98 | |
| 99 | #ifndef DEVICE_POLLING_FREQ_MAX |
| 100 | #define DEVICE_POLLING_FREQ_MAX 30000 |
| 101 | #endif |
| 102 | #define DEVICE_POLLING_FREQ_DEFAULT 2000 |
| 103 | |
| 104 | #define POLL_LIST_LEN 128 |
| 105 | struct pollrec { |
| 106 | struct ifnet *ifp; |
| 107 | }; |
| 108 | |
| 109 | #define POLLCTX_MAX 32 |
| 110 | |
| 111 | struct pollctx { |
| 112 | struct sysctl_ctx_list poll_sysctl_ctx; |
| 113 | struct sysctl_oid *poll_sysctl_tree; |
| 114 | |
| 115 | uint32_t poll_burst; /* state */ |
| 116 | uint32_t poll_each_burst; /* tunable */ |
| 117 | uint32_t poll_burst_max; /* tunable */ |
| 118 | uint32_t user_frac; /* tunable */ |
| 119 | int reg_frac_count; /* state */ |
| 120 | uint32_t reg_frac; /* tunable */ |
| 121 | uint32_t short_ticks; /* statistics */ |
| 122 | uint32_t lost_polls; /* statistics */ |
| 123 | uint32_t pending_polls; /* state */ |
| 124 | int residual_burst; /* state */ |
| 125 | uint32_t phase; /* state */ |
| 126 | uint32_t suspect; /* statistics */ |
| 127 | uint32_t stalled; /* statistics */ |
| 128 | struct timeval poll_start_t; /* state */ |
| 129 | struct timeval prev_t; /* state */ |
| 130 | |
| 131 | uint32_t poll_handlers; /* next free entry in pr[]. */ |
| 132 | struct pollrec pr[POLL_LIST_LEN]; |
| 133 | |
| 134 | int poll_cpuid; |
| 135 | struct systimer pollclock; |
| 136 | int polling_enabled; /* tunable */ |
| 137 | int pollhz; /* tunable */ |
| 138 | |
| 139 | struct netmsg_base poll_netmsg; |
| 140 | struct netmsg_base poll_more_netmsg; |
| 141 | }; |
| 142 | |
| 143 | static struct pollctx *poll_context[POLLCTX_MAX]; |
| 144 | |
| 145 | SYSCTL_NODE(_kern, OID_AUTO, polling, CTLFLAG_RW, 0, |
| 146 | "Device polling parameters"); |
| 147 | |
| 148 | static int poll_defcpu = -1; |
| 149 | SYSCTL_INT(_kern_polling, OID_AUTO, defcpu, CTLFLAG_RD, |
| 150 | &poll_defcpu, 0, "default CPU to run device polling"); |
| 151 | |
| 152 | static cpumask_t poll_cpumask0 = (cpumask_t)-1; |
| 153 | TUNABLE_ULONG("kern.polling.cpumask", (u_long *)&poll_cpumask0); |
| 154 | |
| 155 | static cpumask_t poll_cpumask; |
| 156 | SYSCTL_LONG(_kern_polling, OID_AUTO, cpumask, CTLFLAG_RD, |
| 157 | &poll_cpumask, 0, "CPUs that can run device polling"); |
| 158 | |
| 159 | static int polling_enabled = 1; /* global polling enable */ |
| 160 | TUNABLE_INT("kern.polling.enable", &polling_enabled); |
| 161 | |
| 162 | static int pollhz = DEVICE_POLLING_FREQ_DEFAULT; |
| 163 | TUNABLE_INT("kern.polling.pollhz", &pollhz); |
| 164 | |
| 165 | static int poll_burst_max = POLL_BURST_MAX; |
| 166 | TUNABLE_INT("kern.polling.burst_max", &poll_burst_max); |
| 167 | |
| 168 | static int poll_each_burst = POLL_EACH_BURST; |
| 169 | TUNABLE_INT("kern.polling.each_burst", &poll_each_burst); |
| 170 | |
| 171 | /* Netisr handlers */ |
| 172 | static void netisr_poll(netmsg_t); |
| 173 | static void netisr_pollmore(netmsg_t); |
| 174 | static void poll_register(netmsg_t); |
| 175 | static void poll_deregister(netmsg_t); |
| 176 | static void poll_sysctl_pollhz(netmsg_t); |
| 177 | static void poll_sysctl_polling(netmsg_t); |
| 178 | static void poll_sysctl_regfrac(netmsg_t); |
| 179 | static void poll_sysctl_burstmax(netmsg_t); |
| 180 | static void poll_sysctl_eachburst(netmsg_t); |
| 181 | |
| 182 | /* Systimer handler */ |
| 183 | static void pollclock(systimer_t, int, struct intrframe *); |
| 184 | |
| 185 | /* Sysctl handlers */ |
| 186 | static int sysctl_pollhz(SYSCTL_HANDLER_ARGS); |
| 187 | static int sysctl_polling(SYSCTL_HANDLER_ARGS); |
| 188 | static int sysctl_regfrac(SYSCTL_HANDLER_ARGS); |
| 189 | static int sysctl_burstmax(SYSCTL_HANDLER_ARGS); |
| 190 | static int sysctl_eachburst(SYSCTL_HANDLER_ARGS); |
| 191 | static void poll_add_sysctl(struct sysctl_ctx_list *, |
| 192 | struct sysctl_oid_list *, struct pollctx *); |
| 193 | |
| 194 | void init_device_poll_pcpu(int); /* per-cpu init routine */ |
| 195 | |
| 196 | #define POLL_KTR_STRING "ifp=%p" |
| 197 | #define POLL_KTR_ARG_SIZE (sizeof(void *)) |
| 198 | |
| 199 | #ifndef KTR_POLLING |
| 200 | #define KTR_POLLING KTR_ALL |
| 201 | #endif |
| 202 | KTR_INFO_MASTER(poll); |
| 203 | KTR_INFO(KTR_POLLING, poll, beg, 0, "ifp=%p", void *ifp); |
| 204 | KTR_INFO(KTR_POLLING, poll, end, 1, "ifp=%p", void *ifp); |
| 205 | |
| 206 | #define logpoll(name, arg) KTR_LOG(poll_ ## name, arg) |
| 207 | |
| 208 | static __inline void |
| 209 | poll_reset_state(struct pollctx *pctx) |
| 210 | { |
| 211 | crit_enter(); |
| 212 | pctx->poll_burst = 5; |
| 213 | pctx->reg_frac_count = 0; |
| 214 | pctx->pending_polls = 0; |
| 215 | pctx->residual_burst = 0; |
| 216 | pctx->phase = 0; |
| 217 | bzero(&pctx->poll_start_t, sizeof(pctx->poll_start_t)); |
| 218 | bzero(&pctx->prev_t, sizeof(pctx->prev_t)); |
| 219 | crit_exit(); |
| 220 | } |
| 221 | |
| 222 | /* |
| 223 | * Initialize per-cpu polling(4) context. Called from kern_clock.c: |
| 224 | */ |
| 225 | void |
| 226 | init_device_poll_pcpu(int cpuid) |
| 227 | { |
| 228 | struct pollctx *pctx; |
| 229 | char cpuid_str[3]; |
| 230 | |
| 231 | if (cpuid >= POLLCTX_MAX) |
| 232 | return; |
| 233 | |
| 234 | if ((CPUMASK(cpuid) & poll_cpumask0) == 0) |
| 235 | return; |
| 236 | |
| 237 | if (poll_burst_max < MIN_POLL_BURST_MAX) |
| 238 | poll_burst_max = MIN_POLL_BURST_MAX; |
| 239 | else if (poll_burst_max > MAX_POLL_BURST_MAX) |
| 240 | poll_burst_max = MAX_POLL_BURST_MAX; |
| 241 | |
| 242 | if (poll_each_burst > poll_burst_max) |
| 243 | poll_each_burst = poll_burst_max; |
| 244 | |
| 245 | poll_cpumask |= CPUMASK(cpuid); |
| 246 | |
| 247 | pctx = kmalloc(sizeof(*pctx), M_DEVBUF, M_WAITOK | M_ZERO); |
| 248 | |
| 249 | pctx->poll_each_burst = poll_each_burst; |
| 250 | pctx->poll_burst_max = poll_burst_max; |
| 251 | pctx->user_frac = 50; |
| 252 | pctx->reg_frac = 20; |
| 253 | pctx->polling_enabled = polling_enabled; |
| 254 | pctx->pollhz = pollhz; |
| 255 | pctx->poll_cpuid = cpuid; |
| 256 | poll_reset_state(pctx); |
| 257 | |
| 258 | netmsg_init(&pctx->poll_netmsg, NULL, &netisr_adone_rport, |
| 259 | 0, netisr_poll); |
| 260 | #ifdef INVARIANTS |
| 261 | pctx->poll_netmsg.lmsg.u.ms_resultp = pctx; |
| 262 | #endif |
| 263 | |
| 264 | netmsg_init(&pctx->poll_more_netmsg, NULL, &netisr_adone_rport, |
| 265 | 0, netisr_pollmore); |
| 266 | #ifdef INVARIANTS |
| 267 | pctx->poll_more_netmsg.lmsg.u.ms_resultp = pctx; |
| 268 | #endif |
| 269 | |
| 270 | KASSERT(cpuid < POLLCTX_MAX, ("cpu id must < %d", cpuid)); |
| 271 | poll_context[cpuid] = pctx; |
| 272 | |
| 273 | if (poll_defcpu < 0) { |
| 274 | poll_defcpu = cpuid; |
| 275 | |
| 276 | /* |
| 277 | * Initialize global sysctl nodes, for compat |
| 278 | */ |
| 279 | poll_add_sysctl(NULL, SYSCTL_STATIC_CHILDREN(_kern_polling), |
| 280 | pctx); |
| 281 | } |
| 282 | |
| 283 | /* |
| 284 | * Initialize per-cpu sysctl nodes |
| 285 | */ |
| 286 | ksnprintf(cpuid_str, sizeof(cpuid_str), "%d", pctx->poll_cpuid); |
| 287 | |
| 288 | sysctl_ctx_init(&pctx->poll_sysctl_ctx); |
| 289 | pctx->poll_sysctl_tree = SYSCTL_ADD_NODE(&pctx->poll_sysctl_ctx, |
| 290 | SYSCTL_STATIC_CHILDREN(_kern_polling), |
| 291 | OID_AUTO, cpuid_str, CTLFLAG_RD, 0, ""); |
| 292 | poll_add_sysctl(&pctx->poll_sysctl_ctx, |
| 293 | SYSCTL_CHILDREN(pctx->poll_sysctl_tree), pctx); |
| 294 | |
| 295 | /* |
| 296 | * Initialize systimer |
| 297 | */ |
| 298 | systimer_init_periodic_nq(&pctx->pollclock, pollclock, pctx, 1); |
| 299 | } |
| 300 | |
| 301 | static void |
| 302 | schedpoll_oncpu(netmsg_t msg) |
| 303 | { |
| 304 | if (msg->lmsg.ms_flags & MSGF_DONE) |
| 305 | lwkt_sendmsg(cpu_portfn(mycpuid), &msg->lmsg); |
| 306 | } |
| 307 | |
| 308 | static __inline void |
| 309 | schedpoll(struct pollctx *pctx) |
| 310 | { |
| 311 | crit_enter(); |
| 312 | schedpoll_oncpu((netmsg_t)&pctx->poll_netmsg); |
| 313 | crit_exit(); |
| 314 | } |
| 315 | |
| 316 | static __inline void |
| 317 | schedpollmore(struct pollctx *pctx) |
| 318 | { |
| 319 | schedpoll_oncpu((netmsg_t)&pctx->poll_more_netmsg); |
| 320 | } |
| 321 | |
| 322 | /* |
| 323 | * Set the polling frequency |
| 324 | */ |
| 325 | static int |
| 326 | sysctl_pollhz(SYSCTL_HANDLER_ARGS) |
| 327 | { |
| 328 | struct pollctx *pctx = arg1; |
| 329 | struct netmsg_base msg; |
| 330 | lwkt_port_t port; |
| 331 | int error, phz; |
| 332 | |
| 333 | phz = pctx->pollhz; |
| 334 | error = sysctl_handle_int(oidp, &phz, 0, req); |
| 335 | if (error || req->newptr == NULL) |
| 336 | return error; |
| 337 | if (phz <= 0) |
| 338 | return EINVAL; |
| 339 | else if (phz > DEVICE_POLLING_FREQ_MAX) |
| 340 | phz = DEVICE_POLLING_FREQ_MAX; |
| 341 | |
| 342 | netmsg_init(&msg, NULL, &curthread->td_msgport, |
| 343 | 0, poll_sysctl_pollhz); |
| 344 | msg.lmsg.u.ms_result = phz; |
| 345 | |
| 346 | port = cpu_portfn(pctx->poll_cpuid); |
| 347 | lwkt_domsg(port, &msg.lmsg, 0); |
| 348 | return 0; |
| 349 | } |
| 350 | |
| 351 | /* |
| 352 | * Master enable. |
| 353 | */ |
| 354 | static int |
| 355 | sysctl_polling(SYSCTL_HANDLER_ARGS) |
| 356 | { |
| 357 | struct pollctx *pctx = arg1; |
| 358 | struct netmsg_base msg; |
| 359 | lwkt_port_t port; |
| 360 | int error, enabled; |
| 361 | |
| 362 | enabled = pctx->polling_enabled; |
| 363 | error = sysctl_handle_int(oidp, &enabled, 0, req); |
| 364 | if (error || req->newptr == NULL) |
| 365 | return error; |
| 366 | |
| 367 | netmsg_init(&msg, NULL, &curthread->td_msgport, |
| 368 | 0, poll_sysctl_polling); |
| 369 | msg.lmsg.u.ms_result = enabled; |
| 370 | |
| 371 | port = cpu_portfn(pctx->poll_cpuid); |
| 372 | lwkt_domsg(port, &msg.lmsg, 0); |
| 373 | return 0; |
| 374 | } |
| 375 | |
| 376 | static int |
| 377 | sysctl_regfrac(SYSCTL_HANDLER_ARGS) |
| 378 | { |
| 379 | struct pollctx *pctx = arg1; |
| 380 | struct netmsg_base msg; |
| 381 | lwkt_port_t port; |
| 382 | uint32_t reg_frac; |
| 383 | int error; |
| 384 | |
| 385 | reg_frac = pctx->reg_frac; |
| 386 | error = sysctl_handle_int(oidp, ®_frac, 0, req); |
| 387 | if (error || req->newptr == NULL) |
| 388 | return error; |
| 389 | |
| 390 | netmsg_init(&msg, NULL, &curthread->td_msgport, |
| 391 | 0, poll_sysctl_regfrac); |
| 392 | msg.lmsg.u.ms_result = reg_frac; |
| 393 | |
| 394 | port = cpu_portfn(pctx->poll_cpuid); |
| 395 | lwkt_domsg(port, &msg.lmsg, 0); |
| 396 | return 0; |
| 397 | } |
| 398 | |
| 399 | static int |
| 400 | sysctl_burstmax(SYSCTL_HANDLER_ARGS) |
| 401 | { |
| 402 | struct pollctx *pctx = arg1; |
| 403 | struct netmsg_base msg; |
| 404 | lwkt_port_t port; |
| 405 | uint32_t burst_max; |
| 406 | int error; |
| 407 | |
| 408 | burst_max = pctx->poll_burst_max; |
| 409 | error = sysctl_handle_int(oidp, &burst_max, 0, req); |
| 410 | if (error || req->newptr == NULL) |
| 411 | return error; |
| 412 | if (burst_max < MIN_POLL_BURST_MAX) |
| 413 | burst_max = MIN_POLL_BURST_MAX; |
| 414 | else if (burst_max > MAX_POLL_BURST_MAX) |
| 415 | burst_max = MAX_POLL_BURST_MAX; |
| 416 | |
| 417 | netmsg_init(&msg, NULL, &curthread->td_msgport, |
| 418 | 0, poll_sysctl_burstmax); |
| 419 | msg.lmsg.u.ms_result = burst_max; |
| 420 | |
| 421 | port = cpu_portfn(pctx->poll_cpuid); |
| 422 | lwkt_domsg(port, &msg.lmsg, 0); |
| 423 | return 0; |
| 424 | } |
| 425 | |
| 426 | static int |
| 427 | sysctl_eachburst(SYSCTL_HANDLER_ARGS) |
| 428 | { |
| 429 | struct pollctx *pctx = arg1; |
| 430 | struct netmsg_base msg; |
| 431 | lwkt_port_t port; |
| 432 | uint32_t each_burst; |
| 433 | int error; |
| 434 | |
| 435 | each_burst = pctx->poll_each_burst; |
| 436 | error = sysctl_handle_int(oidp, &each_burst, 0, req); |
| 437 | if (error || req->newptr == NULL) |
| 438 | return error; |
| 439 | |
| 440 | netmsg_init(&msg, NULL, &curthread->td_msgport, |
| 441 | 0, poll_sysctl_eachburst); |
| 442 | msg.lmsg.u.ms_result = each_burst; |
| 443 | |
| 444 | port = cpu_portfn(pctx->poll_cpuid); |
| 445 | lwkt_domsg(port, &msg.lmsg, 0); |
| 446 | return 0; |
| 447 | } |
| 448 | |
| 449 | /* |
| 450 | * Hook from polling systimer. Tries to schedule a netisr, but keeps |
| 451 | * track of lost ticks due to the previous handler taking too long. |
| 452 | * Normally, this should not happen, because polling handler should |
| 453 | * run for a short time. However, in some cases (e.g. when there are |
| 454 | * changes in link status etc.) the drivers take a very long time |
| 455 | * (even in the order of milliseconds) to reset and reconfigure the |
| 456 | * device, causing apparent lost polls. |
| 457 | * |
| 458 | * The first part of the code is just for debugging purposes, and tries |
| 459 | * to count how often hardclock ticks are shorter than they should, |
| 460 | * meaning either stray interrupts or delayed events. |
| 461 | * |
| 462 | * WARNING! called from fastint or IPI, the MP lock might not be held. |
| 463 | */ |
| 464 | static void |
| 465 | pollclock(systimer_t info, int in_ipi __unused, |
| 466 | struct intrframe *frame __unused) |
| 467 | { |
| 468 | struct pollctx *pctx = info->data; |
| 469 | struct timeval t; |
| 470 | int delta; |
| 471 | |
| 472 | if (pctx->poll_handlers == 0) |
| 473 | return; |
| 474 | |
| 475 | microuptime(&t); |
| 476 | delta = (t.tv_usec - pctx->prev_t.tv_usec) + |
| 477 | (t.tv_sec - pctx->prev_t.tv_sec)*1000000; |
| 478 | if (delta * pctx->pollhz < 500000) |
| 479 | pctx->short_ticks++; |
| 480 | else |
| 481 | pctx->prev_t = t; |
| 482 | |
| 483 | if (pctx->pending_polls > 100) { |
| 484 | /* |
| 485 | * Too much, assume it has stalled (not always true |
| 486 | * see comment above). |
| 487 | */ |
| 488 | pctx->stalled++; |
| 489 | pctx->pending_polls = 0; |
| 490 | pctx->phase = 0; |
| 491 | } |
| 492 | |
| 493 | if (pctx->phase <= 2) { |
| 494 | if (pctx->phase != 0) |
| 495 | pctx->suspect++; |
| 496 | pctx->phase = 1; |
| 497 | schedpoll(pctx); |
| 498 | pctx->phase = 2; |
| 499 | } |
| 500 | if (pctx->pending_polls++ > 0) |
| 501 | pctx->lost_polls++; |
| 502 | } |
| 503 | |
| 504 | /* |
| 505 | * netisr_pollmore is called after other netisr's, possibly scheduling |
| 506 | * another NETISR_POLL call, or adapting the burst size for the next cycle. |
| 507 | * |
| 508 | * It is very bad to fetch large bursts of packets from a single card at once, |
| 509 | * because the burst could take a long time to be completely processed leading |
| 510 | * to unfairness. To reduce the problem, and also to account better for time |
| 511 | * spent in network-related processing, we split the burst in smaller chunks |
| 512 | * of fixed size, giving control to the other netisr's between chunks. This |
| 513 | * helps in improving the fairness, reducing livelock (because we emulate more |
| 514 | * closely the "process to completion" that we have with fastforwarding) and |
| 515 | * accounting for the work performed in low level handling and forwarding. |
| 516 | */ |
| 517 | |
| 518 | /* ARGSUSED */ |
| 519 | static void |
| 520 | netisr_pollmore(netmsg_t msg) |
| 521 | { |
| 522 | struct pollctx *pctx; |
| 523 | struct timeval t; |
| 524 | int kern_load, cpuid; |
| 525 | uint32_t pending_polls; |
| 526 | |
| 527 | cpuid = mycpu->gd_cpuid; |
| 528 | KKASSERT(cpuid < POLLCTX_MAX); |
| 529 | |
| 530 | pctx = poll_context[cpuid]; |
| 531 | KKASSERT(pctx != NULL); |
| 532 | KKASSERT(pctx->poll_cpuid == cpuid); |
| 533 | KKASSERT(pctx == msg->lmsg.u.ms_resultp); |
| 534 | |
| 535 | lwkt_replymsg(&msg->lmsg, 0); |
| 536 | |
| 537 | if (pctx->poll_handlers == 0) |
| 538 | return; |
| 539 | |
| 540 | KASSERT(pctx->polling_enabled, |
| 541 | ("# of registered poll handlers are not zero, " |
| 542 | "but polling is not enabled\n")); |
| 543 | |
| 544 | pctx->phase = 5; |
| 545 | if (pctx->residual_burst > 0) { |
| 546 | schedpoll(pctx); |
| 547 | /* will run immediately on return, followed by netisrs */ |
| 548 | return; |
| 549 | } |
| 550 | /* here we can account time spent in netisr's in this tick */ |
| 551 | microuptime(&t); |
| 552 | kern_load = (t.tv_usec - pctx->poll_start_t.tv_usec) + |
| 553 | (t.tv_sec - pctx->poll_start_t.tv_sec)*1000000; /* us */ |
| 554 | kern_load = (kern_load * pctx->pollhz) / 10000; /* 0..100 */ |
| 555 | if (kern_load > (100 - pctx->user_frac)) { /* try decrease ticks */ |
| 556 | if (pctx->poll_burst > 1) |
| 557 | pctx->poll_burst--; |
| 558 | } else { |
| 559 | if (pctx->poll_burst < pctx->poll_burst_max) |
| 560 | pctx->poll_burst++; |
| 561 | } |
| 562 | |
| 563 | crit_enter(); |
| 564 | pctx->pending_polls--; |
| 565 | pending_polls = pctx->pending_polls; |
| 566 | crit_exit(); |
| 567 | |
| 568 | if (pending_polls == 0) { /* we are done */ |
| 569 | pctx->phase = 0; |
| 570 | } else { |
| 571 | /* |
| 572 | * Last cycle was long and caused us to miss one or more |
| 573 | * hardclock ticks. Restart processing again, but slightly |
| 574 | * reduce the burst size to prevent that this happens again. |
| 575 | */ |
| 576 | pctx->poll_burst -= (pctx->poll_burst / 8); |
| 577 | if (pctx->poll_burst < 1) |
| 578 | pctx->poll_burst = 1; |
| 579 | schedpoll(pctx); |
| 580 | pctx->phase = 6; |
| 581 | } |
| 582 | } |
| 583 | |
| 584 | /* |
| 585 | * netisr_poll is scheduled by schedpoll when appropriate, typically once |
| 586 | * per polling systimer tick. |
| 587 | * |
| 588 | * Note that the message is replied immediately in order to allow a new |
| 589 | * ISR to be scheduled in the handler. |
| 590 | * |
| 591 | * XXX each registration should indicate whether it needs a critical |
| 592 | * section to operate. |
| 593 | */ |
| 594 | /* ARGSUSED */ |
| 595 | static void |
| 596 | netisr_poll(netmsg_t msg) |
| 597 | { |
| 598 | struct pollctx *pctx; |
| 599 | int i, cycles, cpuid; |
| 600 | enum poll_cmd arg = POLL_ONLY; |
| 601 | |
| 602 | cpuid = mycpu->gd_cpuid; |
| 603 | KKASSERT(cpuid < POLLCTX_MAX); |
| 604 | |
| 605 | pctx = poll_context[cpuid]; |
| 606 | KKASSERT(pctx != NULL); |
| 607 | KKASSERT(pctx->poll_cpuid == cpuid); |
| 608 | KKASSERT(pctx == msg->lmsg.u.ms_resultp); |
| 609 | |
| 610 | crit_enter(); |
| 611 | lwkt_replymsg(&msg->lmsg, 0); |
| 612 | crit_exit(); |
| 613 | |
| 614 | if (pctx->poll_handlers == 0) |
| 615 | return; |
| 616 | |
| 617 | KASSERT(pctx->polling_enabled, |
| 618 | ("# of registered poll handlers are not zero, " |
| 619 | "but polling is not enabled\n")); |
| 620 | |
| 621 | pctx->phase = 3; |
| 622 | if (pctx->residual_burst == 0) { /* first call in this tick */ |
| 623 | microuptime(&pctx->poll_start_t); |
| 624 | |
| 625 | if (pctx->reg_frac_count-- == 0) { |
| 626 | arg = POLL_AND_CHECK_STATUS; |
| 627 | pctx->reg_frac_count = pctx->reg_frac - 1; |
| 628 | } |
| 629 | |
| 630 | pctx->residual_burst = pctx->poll_burst; |
| 631 | } |
| 632 | cycles = (pctx->residual_burst < pctx->poll_each_burst) ? |
| 633 | pctx->residual_burst : pctx->poll_each_burst; |
| 634 | pctx->residual_burst -= cycles; |
| 635 | |
| 636 | for (i = 0 ; i < pctx->poll_handlers ; i++) { |
| 637 | struct ifnet *ifp = pctx->pr[i].ifp; |
| 638 | |
| 639 | if (!ifnet_tryserialize_main(ifp)) |
| 640 | continue; |
| 641 | |
| 642 | if ((ifp->if_flags & (IFF_UP|IFF_RUNNING|IFF_POLLING)) |
| 643 | == (IFF_UP|IFF_RUNNING|IFF_POLLING)) { |
| 644 | logpoll(beg, ifp); |
| 645 | crit_enter(); |
| 646 | ifp->if_poll(ifp, arg, cycles); |
| 647 | crit_exit(); |
| 648 | logpoll(end, ifp); |
| 649 | } |
| 650 | |
| 651 | ifnet_deserialize_main(ifp); |
| 652 | } |
| 653 | |
| 654 | schedpollmore(pctx); |
| 655 | pctx->phase = 4; |
| 656 | } |
| 657 | |
| 658 | static void |
| 659 | poll_register(netmsg_t msg) |
| 660 | { |
| 661 | struct ifnet *ifp = msg->lmsg.u.ms_resultp; |
| 662 | struct pollctx *pctx; |
| 663 | int rc, cpuid; |
| 664 | |
| 665 | cpuid = mycpu->gd_cpuid; |
| 666 | KKASSERT(cpuid < POLLCTX_MAX); |
| 667 | |
| 668 | pctx = poll_context[cpuid]; |
| 669 | KKASSERT(pctx != NULL); |
| 670 | KKASSERT(pctx->poll_cpuid == cpuid); |
| 671 | |
| 672 | if (pctx->polling_enabled == 0) { |
| 673 | /* Polling disabled, cannot register */ |
| 674 | rc = EOPNOTSUPP; |
| 675 | goto back; |
| 676 | } |
| 677 | |
| 678 | /* |
| 679 | * Check if there is room. |
| 680 | */ |
| 681 | if (pctx->poll_handlers >= POLL_LIST_LEN) { |
| 682 | /* |
| 683 | * List full, cannot register more entries. |
| 684 | * This should never happen; if it does, it is probably a |
| 685 | * broken driver trying to register multiple times. Checking |
| 686 | * this at runtime is expensive, and won't solve the problem |
| 687 | * anyways, so just report a few times and then give up. |
| 688 | */ |
| 689 | static int verbose = 10; /* XXX */ |
| 690 | if (verbose >0) { |
| 691 | kprintf("poll handlers list full, " |
| 692 | "maybe a broken driver ?\n"); |
| 693 | verbose--; |
| 694 | } |
| 695 | rc = ENOMEM; |
| 696 | } else { |
| 697 | pctx->pr[pctx->poll_handlers].ifp = ifp; |
| 698 | pctx->poll_handlers++; |
| 699 | rc = 0; |
| 700 | |
| 701 | if (pctx->poll_handlers == 1) { |
| 702 | KKASSERT(pctx->polling_enabled); |
| 703 | systimer_adjust_periodic(&pctx->pollclock, |
| 704 | pctx->pollhz); |
| 705 | } |
| 706 | } |
| 707 | back: |
| 708 | lwkt_replymsg(&msg->lmsg, rc); |
| 709 | } |
| 710 | |
| 711 | /* |
| 712 | * Try to register routine for polling. Returns 1 if successful |
| 713 | * (and polling should be enabled), 0 otherwise. |
| 714 | * |
| 715 | * Called from mainline code only, not called from an interrupt. |
| 716 | */ |
| 717 | int |
| 718 | ether_poll_register(struct ifnet *ifp) |
| 719 | { |
| 720 | if (poll_defcpu < 0) |
| 721 | return 0; |
| 722 | KKASSERT(poll_defcpu < POLLCTX_MAX); |
| 723 | |
| 724 | return ether_pollcpu_register(ifp, poll_defcpu); |
| 725 | } |
| 726 | |
| 727 | int |
| 728 | ether_pollcpu_register(struct ifnet *ifp, int cpuid) |
| 729 | { |
| 730 | struct netmsg_base msg; |
| 731 | lwkt_port_t port; |
| 732 | int rc; |
| 733 | |
| 734 | if (ifp->if_poll == NULL) { |
| 735 | /* Device does not support polling */ |
| 736 | return 0; |
| 737 | } |
| 738 | |
| 739 | if (cpuid < 0 || cpuid >= POLLCTX_MAX) |
| 740 | return 0; |
| 741 | |
| 742 | if ((CPUMASK(cpuid) & poll_cpumask) == 0) { |
| 743 | /* Polling is not supported on 'cpuid' */ |
| 744 | return 0; |
| 745 | } |
| 746 | KKASSERT(poll_context[cpuid] != NULL); |
| 747 | |
| 748 | /* |
| 749 | * Attempt to register. Interlock with IFF_POLLING. |
| 750 | */ |
| 751 | crit_enter(); /* XXX MP - not mp safe */ |
| 752 | |
| 753 | ifnet_serialize_all(ifp); |
| 754 | if (ifp->if_flags & IFF_POLLING) { |
| 755 | /* Already polling */ |
| 756 | KKASSERT(ifp->if_poll_cpuid >= 0); |
| 757 | ifnet_deserialize_all(ifp); |
| 758 | crit_exit(); |
| 759 | return 0; |
| 760 | } |
| 761 | KKASSERT(ifp->if_poll_cpuid < 0); |
| 762 | ifp->if_flags |= IFF_POLLING; |
| 763 | ifp->if_poll_cpuid = cpuid; |
| 764 | if (ifp->if_flags & IFF_RUNNING) |
| 765 | ifp->if_poll(ifp, POLL_REGISTER, 0); |
| 766 | ifnet_deserialize_all(ifp); |
| 767 | |
| 768 | netmsg_init(&msg, NULL, &curthread->td_msgport, |
| 769 | 0, poll_register); |
| 770 | msg.lmsg.u.ms_resultp = ifp; |
| 771 | |
| 772 | port = cpu_portfn(cpuid); |
| 773 | lwkt_domsg(port, &msg.lmsg, 0); |
| 774 | |
| 775 | if (msg.lmsg.ms_error) { |
| 776 | ifnet_serialize_all(ifp); |
| 777 | ifp->if_flags &= ~IFF_POLLING; |
| 778 | ifp->if_poll_cpuid = -1; |
| 779 | if (ifp->if_flags & IFF_RUNNING) |
| 780 | ifp->if_poll(ifp, POLL_DEREGISTER, 0); |
| 781 | ifnet_deserialize_all(ifp); |
| 782 | rc = 0; |
| 783 | } else { |
| 784 | rc = 1; |
| 785 | } |
| 786 | |
| 787 | crit_exit(); |
| 788 | return rc; |
| 789 | } |
| 790 | |
| 791 | static void |
| 792 | poll_deregister(netmsg_t msg) |
| 793 | { |
| 794 | struct ifnet *ifp = msg->lmsg.u.ms_resultp; |
| 795 | struct pollctx *pctx; |
| 796 | int rc, i, cpuid; |
| 797 | |
| 798 | cpuid = mycpu->gd_cpuid; |
| 799 | KKASSERT(cpuid < POLLCTX_MAX); |
| 800 | |
| 801 | pctx = poll_context[cpuid]; |
| 802 | KKASSERT(pctx != NULL); |
| 803 | KKASSERT(pctx->poll_cpuid == cpuid); |
| 804 | |
| 805 | for (i = 0 ; i < pctx->poll_handlers ; i++) { |
| 806 | if (pctx->pr[i].ifp == ifp) /* Found it */ |
| 807 | break; |
| 808 | } |
| 809 | if (i == pctx->poll_handlers) { |
| 810 | kprintf("ether_poll_deregister: ifp not found!!!\n"); |
| 811 | rc = ENOENT; |
| 812 | } else { |
| 813 | pctx->poll_handlers--; |
| 814 | if (i < pctx->poll_handlers) { |
| 815 | /* Last entry replaces this one. */ |
| 816 | pctx->pr[i].ifp = pctx->pr[pctx->poll_handlers].ifp; |
| 817 | } |
| 818 | |
| 819 | if (pctx->poll_handlers == 0) { |
| 820 | systimer_adjust_periodic(&pctx->pollclock, 1); |
| 821 | poll_reset_state(pctx); |
| 822 | } |
| 823 | rc = 0; |
| 824 | } |
| 825 | lwkt_replymsg(&msg->lmsg, rc); |
| 826 | } |
| 827 | |
| 828 | /* |
| 829 | * Remove interface from the polling list. Occurs when polling is turned |
| 830 | * off. Called from mainline code only, not called from an interrupt. |
| 831 | */ |
| 832 | int |
| 833 | ether_poll_deregister(struct ifnet *ifp) |
| 834 | { |
| 835 | struct netmsg_base msg; |
| 836 | lwkt_port_t port; |
| 837 | int rc, cpuid; |
| 838 | |
| 839 | KKASSERT(ifp != NULL); |
| 840 | |
| 841 | if (ifp->if_poll == NULL) |
| 842 | return 0; |
| 843 | |
| 844 | crit_enter(); |
| 845 | |
| 846 | ifnet_serialize_all(ifp); |
| 847 | if ((ifp->if_flags & IFF_POLLING) == 0) { |
| 848 | KKASSERT(ifp->if_poll_cpuid < 0); |
| 849 | ifnet_deserialize_all(ifp); |
| 850 | crit_exit(); |
| 851 | return 0; |
| 852 | } |
| 853 | |
| 854 | cpuid = ifp->if_poll_cpuid; |
| 855 | KKASSERT(cpuid >= 0); |
| 856 | KKASSERT(poll_context[cpuid] != NULL); |
| 857 | |
| 858 | ifp->if_flags &= ~IFF_POLLING; |
| 859 | ifp->if_poll_cpuid = -1; |
| 860 | ifnet_deserialize_all(ifp); |
| 861 | |
| 862 | netmsg_init(&msg, NULL, &curthread->td_msgport, |
| 863 | 0, poll_deregister); |
| 864 | msg.lmsg.u.ms_resultp = ifp; |
| 865 | |
| 866 | port = cpu_portfn(cpuid); |
| 867 | lwkt_domsg(port, &msg.lmsg, 0); |
| 868 | |
| 869 | if (!msg.lmsg.ms_error) { |
| 870 | ifnet_serialize_all(ifp); |
| 871 | if (ifp->if_flags & IFF_RUNNING) |
| 872 | ifp->if_poll(ifp, POLL_DEREGISTER, 1); |
| 873 | ifnet_deserialize_all(ifp); |
| 874 | rc = 1; |
| 875 | } else { |
| 876 | rc = 0; |
| 877 | } |
| 878 | |
| 879 | crit_exit(); |
| 880 | return rc; |
| 881 | } |
| 882 | |
| 883 | static void |
| 884 | poll_add_sysctl(struct sysctl_ctx_list *ctx, struct sysctl_oid_list *parent, |
| 885 | struct pollctx *pctx) |
| 886 | { |
| 887 | SYSCTL_ADD_PROC(ctx, parent, OID_AUTO, "enable", |
| 888 | CTLTYPE_INT | CTLFLAG_RW, pctx, 0, sysctl_polling, |
| 889 | "I", "Polling enabled"); |
| 890 | |
| 891 | SYSCTL_ADD_PROC(ctx, parent, OID_AUTO, "pollhz", |
| 892 | CTLTYPE_INT | CTLFLAG_RW, pctx, 0, sysctl_pollhz, |
| 893 | "I", "Device polling frequency"); |
| 894 | |
| 895 | SYSCTL_ADD_PROC(ctx, parent, OID_AUTO, "reg_frac", |
| 896 | CTLTYPE_UINT | CTLFLAG_RW, pctx, 0, sysctl_regfrac, |
| 897 | "IU", "Every this many cycles poll register"); |
| 898 | |
| 899 | SYSCTL_ADD_PROC(ctx, parent, OID_AUTO, "burst_max", |
| 900 | CTLTYPE_UINT | CTLFLAG_RW, pctx, 0, sysctl_burstmax, |
| 901 | "IU", "Max Polling burst size"); |
| 902 | |
| 903 | SYSCTL_ADD_PROC(ctx, parent, OID_AUTO, "each_burst", |
| 904 | CTLTYPE_UINT | CTLFLAG_RW, pctx, 0, sysctl_eachburst, |
| 905 | "IU", "Max size of each burst"); |
| 906 | |
| 907 | SYSCTL_ADD_UINT(ctx, parent, OID_AUTO, "phase", CTLFLAG_RD, |
| 908 | &pctx->phase, 0, "Polling phase"); |
| 909 | |
| 910 | SYSCTL_ADD_UINT(ctx, parent, OID_AUTO, "suspect", CTLFLAG_RW, |
| 911 | &pctx->suspect, 0, "suspect event"); |
| 912 | |
| 913 | SYSCTL_ADD_UINT(ctx, parent, OID_AUTO, "stalled", CTLFLAG_RW, |
| 914 | &pctx->stalled, 0, "potential stalls"); |
| 915 | |
| 916 | SYSCTL_ADD_UINT(ctx, parent, OID_AUTO, "burst", CTLFLAG_RD, |
| 917 | &pctx->poll_burst, 0, "Current polling burst size"); |
| 918 | |
| 919 | SYSCTL_ADD_UINT(ctx, parent, OID_AUTO, "user_frac", CTLFLAG_RW, |
| 920 | &pctx->user_frac, 0, |
| 921 | "Desired user fraction of cpu time"); |
| 922 | |
| 923 | SYSCTL_ADD_UINT(ctx, parent, OID_AUTO, "short_ticks", CTLFLAG_RW, |
| 924 | &pctx->short_ticks, 0, |
| 925 | "Hardclock ticks shorter than they should be"); |
| 926 | |
| 927 | SYSCTL_ADD_UINT(ctx, parent, OID_AUTO, "lost_polls", CTLFLAG_RW, |
| 928 | &pctx->lost_polls, 0, |
| 929 | "How many times we would have lost a poll tick"); |
| 930 | |
| 931 | SYSCTL_ADD_UINT(ctx, parent, OID_AUTO, "pending_polls", CTLFLAG_RD, |
| 932 | &pctx->pending_polls, 0, "Do we need to poll again"); |
| 933 | |
| 934 | SYSCTL_ADD_INT(ctx, parent, OID_AUTO, "residual_burst", CTLFLAG_RD, |
| 935 | &pctx->residual_burst, 0, |
| 936 | "# of residual cycles in burst"); |
| 937 | |
| 938 | SYSCTL_ADD_UINT(ctx, parent, OID_AUTO, "handlers", CTLFLAG_RD, |
| 939 | &pctx->poll_handlers, 0, |
| 940 | "Number of registered poll handlers"); |
| 941 | } |
| 942 | |
| 943 | static void |
| 944 | poll_sysctl_pollhz(netmsg_t msg) |
| 945 | { |
| 946 | struct pollctx *pctx; |
| 947 | int cpuid; |
| 948 | |
| 949 | cpuid = mycpu->gd_cpuid; |
| 950 | KKASSERT(cpuid < POLLCTX_MAX); |
| 951 | |
| 952 | pctx = poll_context[cpuid]; |
| 953 | KKASSERT(pctx != NULL); |
| 954 | KKASSERT(pctx->poll_cpuid == cpuid); |
| 955 | |
| 956 | /* |
| 957 | * If polling is disabled or there is no device registered, |
| 958 | * don't adjust polling systimer frequency. |
| 959 | * Polling systimer frequency will be adjusted once polling |
| 960 | * is enabled and there are registered devices. |
| 961 | */ |
| 962 | pctx->pollhz = msg->lmsg.u.ms_result; |
| 963 | if (pctx->polling_enabled && pctx->poll_handlers) |
| 964 | systimer_adjust_periodic(&pctx->pollclock, pctx->pollhz); |
| 965 | |
| 966 | /* |
| 967 | * Make sure that reg_frac and reg_frac_count are within valid range. |
| 968 | */ |
| 969 | if (pctx->reg_frac > pctx->pollhz) { |
| 970 | pctx->reg_frac = pctx->pollhz; |
| 971 | if (pctx->reg_frac_count > pctx->reg_frac) |
| 972 | pctx->reg_frac_count = pctx->reg_frac - 1; |
| 973 | } |
| 974 | |
| 975 | lwkt_replymsg(&msg->lmsg, 0); |
| 976 | } |
| 977 | |
| 978 | static void |
| 979 | poll_sysctl_polling(netmsg_t msg) |
| 980 | { |
| 981 | struct pollctx *pctx; |
| 982 | int cpuid; |
| 983 | |
| 984 | cpuid = mycpu->gd_cpuid; |
| 985 | KKASSERT(cpuid < POLLCTX_MAX); |
| 986 | |
| 987 | pctx = poll_context[cpuid]; |
| 988 | KKASSERT(pctx != NULL); |
| 989 | KKASSERT(pctx->poll_cpuid == cpuid); |
| 990 | |
| 991 | /* |
| 992 | * If polling is disabled or there is no device registered, |
| 993 | * cut the polling systimer frequency to 1hz. |
| 994 | */ |
| 995 | pctx->polling_enabled = msg->lmsg.u.ms_result; |
| 996 | if (pctx->polling_enabled && pctx->poll_handlers) { |
| 997 | systimer_adjust_periodic(&pctx->pollclock, pctx->pollhz); |
| 998 | } else { |
| 999 | systimer_adjust_periodic(&pctx->pollclock, 1); |
| 1000 | poll_reset_state(pctx); |
| 1001 | } |
| 1002 | |
| 1003 | if (!pctx->polling_enabled && pctx->poll_handlers != 0) { |
| 1004 | int i; |
| 1005 | |
| 1006 | for (i = 0 ; i < pctx->poll_handlers ; i++) { |
| 1007 | struct ifnet *ifp = pctx->pr[i].ifp; |
| 1008 | |
| 1009 | ifnet_serialize_all(ifp); |
| 1010 | |
| 1011 | if ((ifp->if_flags & IFF_POLLING) == 0) { |
| 1012 | KKASSERT(ifp->if_poll_cpuid < 0); |
| 1013 | ifnet_deserialize_all(ifp); |
| 1014 | continue; |
| 1015 | } |
| 1016 | ifp->if_flags &= ~IFF_POLLING; |
| 1017 | ifp->if_poll_cpuid = -1; |
| 1018 | |
| 1019 | /* |
| 1020 | * Only call the interface deregistration |
| 1021 | * function if the interface is still |
| 1022 | * running. |
| 1023 | */ |
| 1024 | if (ifp->if_flags & IFF_RUNNING) |
| 1025 | ifp->if_poll(ifp, POLL_DEREGISTER, 1); |
| 1026 | |
| 1027 | ifnet_deserialize_all(ifp); |
| 1028 | } |
| 1029 | pctx->poll_handlers = 0; |
| 1030 | } |
| 1031 | |
| 1032 | lwkt_replymsg(&msg->lmsg, 0); |
| 1033 | } |
| 1034 | |
| 1035 | static void |
| 1036 | poll_sysctl_regfrac(netmsg_t msg) |
| 1037 | { |
| 1038 | struct pollctx *pctx; |
| 1039 | uint32_t reg_frac; |
| 1040 | int cpuid; |
| 1041 | |
| 1042 | cpuid = mycpu->gd_cpuid; |
| 1043 | KKASSERT(cpuid < POLLCTX_MAX); |
| 1044 | |
| 1045 | pctx = poll_context[cpuid]; |
| 1046 | KKASSERT(pctx != NULL); |
| 1047 | KKASSERT(pctx->poll_cpuid == cpuid); |
| 1048 | |
| 1049 | reg_frac = msg->lmsg.u.ms_result; |
| 1050 | if (reg_frac > pctx->pollhz) |
| 1051 | reg_frac = pctx->pollhz; |
| 1052 | else if (reg_frac < 1) |
| 1053 | reg_frac = 1; |
| 1054 | |
| 1055 | pctx->reg_frac = reg_frac; |
| 1056 | if (pctx->reg_frac_count > pctx->reg_frac) |
| 1057 | pctx->reg_frac_count = pctx->reg_frac - 1; |
| 1058 | |
| 1059 | lwkt_replymsg(&msg->lmsg, 0); |
| 1060 | } |
| 1061 | |
| 1062 | static void |
| 1063 | poll_sysctl_burstmax(netmsg_t msg) |
| 1064 | { |
| 1065 | struct pollctx *pctx; |
| 1066 | int cpuid; |
| 1067 | |
| 1068 | cpuid = mycpu->gd_cpuid; |
| 1069 | KKASSERT(cpuid < POLLCTX_MAX); |
| 1070 | |
| 1071 | pctx = poll_context[cpuid]; |
| 1072 | KKASSERT(pctx != NULL); |
| 1073 | KKASSERT(pctx->poll_cpuid == cpuid); |
| 1074 | |
| 1075 | pctx->poll_burst_max = msg->lmsg.u.ms_result; |
| 1076 | if (pctx->poll_each_burst > pctx->poll_burst_max) |
| 1077 | pctx->poll_each_burst = pctx->poll_burst_max; |
| 1078 | if (pctx->poll_burst > pctx->poll_burst_max) |
| 1079 | pctx->poll_burst = pctx->poll_burst_max; |
| 1080 | if (pctx->residual_burst > pctx->poll_burst_max) |
| 1081 | pctx->residual_burst = pctx->poll_burst_max; |
| 1082 | |
| 1083 | lwkt_replymsg(&msg->lmsg, 0); |
| 1084 | } |
| 1085 | |
| 1086 | static void |
| 1087 | poll_sysctl_eachburst(netmsg_t msg) |
| 1088 | { |
| 1089 | struct pollctx *pctx; |
| 1090 | uint32_t each_burst; |
| 1091 | int cpuid; |
| 1092 | |
| 1093 | cpuid = mycpu->gd_cpuid; |
| 1094 | KKASSERT(cpuid < POLLCTX_MAX); |
| 1095 | |
| 1096 | pctx = poll_context[cpuid]; |
| 1097 | KKASSERT(pctx != NULL); |
| 1098 | KKASSERT(pctx->poll_cpuid == cpuid); |
| 1099 | |
| 1100 | each_burst = msg->lmsg.u.ms_result; |
| 1101 | if (each_burst > pctx->poll_burst_max) |
| 1102 | each_burst = pctx->poll_burst_max; |
| 1103 | else if (each_burst < 1) |
| 1104 | each_burst = 1; |
| 1105 | pctx->poll_each_burst = each_burst; |
| 1106 | |
| 1107 | lwkt_replymsg(&msg->lmsg, 0); |
| 1108 | } |