From patchwork Mon Jul 6 08:20:09 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Anton Ivanov X-Patchwork-Id: 1323417 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=openvswitch.org (client-ip=140.211.166.133; helo=hemlock.osuosl.org; envelope-from=ovs-dev-bounces@openvswitch.org; receiver=) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=cambridgegreys.com Received: from hemlock.osuosl.org (smtp2.osuosl.org [140.211.166.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 4B0dms318hz9sQt for ; Mon, 6 Jul 2020 18:20:45 +1000 (AEST) Received: from localhost (localhost [127.0.0.1]) by hemlock.osuosl.org (Postfix) with ESMTP id 8D15D886AF; Mon, 6 Jul 2020 08:20:43 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from hemlock.osuosl.org ([127.0.0.1]) by localhost (.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id eVLo9t3ZF8fo; Mon, 6 Jul 2020 08:20:41 +0000 (UTC) Received: from lists.linuxfoundation.org (lf-lists.osuosl.org [140.211.9.56]) by hemlock.osuosl.org (Postfix) with ESMTP id 349D1885E0; Mon, 6 Jul 2020 08:20:41 +0000 (UTC) Received: from lf-lists.osuosl.org (localhost [127.0.0.1]) by lists.linuxfoundation.org (Postfix) with ESMTP id 15FD7C08A8; Mon, 6 Jul 2020 08:20:41 +0000 (UTC) X-Original-To: dev@openvswitch.org Delivered-To: ovs-dev@lists.linuxfoundation.org Received: from hemlock.osuosl.org (smtp2.osuosl.org [140.211.166.133]) by lists.linuxfoundation.org (Postfix) with ESMTP id EF34CC016F for ; Mon, 6 Jul 2020 08:20:39 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by hemlock.osuosl.org (Postfix) with ESMTP id DC1CF88613 for ; Mon, 6 Jul 2020 08:20:39 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from hemlock.osuosl.org ([127.0.0.1]) by localhost (.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id V9ZFP9Di-1ru for ; Mon, 6 Jul 2020 08:20:37 +0000 (UTC) X-Greylist: from auto-whitelisted by SQLgrey-1.7.6 Received: from www.kot-begemot.co.uk (ivanoab7.miniserver.com [37.128.132.42]) by hemlock.osuosl.org (Postfix) with ESMTPS id 8C268885E0 for ; Mon, 6 Jul 2020 08:20:37 +0000 (UTC) Received: from tun252.jain.kot-begemot.co.uk ([192.168.18.6] helo=jain.kot-begemot.co.uk) by www.kot-begemot.co.uk with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1jsMMd-00068l-3V for dev@openvswitch.org; Mon, 06 Jul 2020 08:20:35 +0000 Received: from jain.kot-begemot.co.uk ([192.168.3.3]) by jain.kot-begemot.co.uk with esmtp (Exim 4.92) (envelope-from ) id 1jsMMZ-0007Tb-CU; Mon, 06 Jul 2020 09:20:33 +0100 From: anton.ivanov@cambridgegreys.com To: dev@openvswitch.org Date: Mon, 6 Jul 2020 09:20:09 +0100 Message-Id: <20200706082013.27446-2-anton.ivanov@cambridgegreys.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20200706082013.27446-1-anton.ivanov@cambridgegreys.com> References: <20200706082013.27446-1-anton.ivanov@cambridgegreys.com> MIME-Version: 1.0 X-Clacks-Overhead: GNU Terry Pratchett Cc: Anton Ivanov Subject: [ovs-dev] [PATCH 1/6] Make polling fds persistent X-BeenThere: ovs-dev@openvswitch.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: ovs-dev-bounces@openvswitch.org Sender: "dev" From: Anton Ivanov Saves on: 1. Allocation and disposal of a hash map per iteration in all threads 2. Re-population of the hashmap with all fds per iteration 3. Walking of the hashmap to construct a pollfd array per iteration 4. Allocating/deallocating the pollfd array per iteration 5. Decreases costs on various lookups Compared to older attempts to do this, this emulates strictly the old behaviour and is 100% backwards compatible with the old approach. Unix only - the unix poll loop has been pulled to a new file. Signed-off-by: Anton Ivanov --- lib/automake.mk | 3 +- lib/poll-loop-unix.c | 415 +++++++++++++++++++++++++++++++++++++++++++ lib/poll-loop.c | 19 +- 3 files changed, 418 insertions(+), 19 deletions(-) create mode 100644 lib/poll-loop-unix.c diff --git a/lib/automake.mk b/lib/automake.mk index 86940ccd2..39ff70650 100644 --- a/lib/automake.mk +++ b/lib/automake.mk @@ -242,7 +242,6 @@ lib_libopenvswitch_la_SOURCES = \ lib/perf-counter.c \ lib/stopwatch.h \ lib/stopwatch.c \ - lib/poll-loop.c \ lib/process.c \ lib/process.h \ lib/pvector.c \ @@ -349,6 +348,7 @@ lib_libopenvswitch_la_SOURCES += \ lib/route-table-stub.c \ lib/if-notifier-stub.c \ lib/stream-windows.c \ + lib/poll-loop.c \ lib/strsep.c else lib_libopenvswitch_la_SOURCES += \ @@ -357,6 +357,7 @@ lib_libopenvswitch_la_SOURCES += \ lib/signals.c \ lib/signals.h \ lib/socket-util-unix.c \ + lib/poll-loop-unix.c \ lib/stream-unix.c endif diff --git a/lib/poll-loop-unix.c b/lib/poll-loop-unix.c new file mode 100644 index 000000000..0fb137855 --- /dev/null +++ b/lib/poll-loop-unix.c @@ -0,0 +1,415 @@ +/* + * Copyright (c) 2020 Red Hat Inc + * Copyright (c) 2008, 2009, 2010, 2011, 2012, 2013, 2014 Nicira, Inc. + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at: + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +#include +#include "openvswitch/poll-loop.h" +#include +#include +#include +#include +#include +#include "coverage.h" +#include "openvswitch/dynamic-string.h" +#include "fatal-signal.h" +#include "openvswitch/list.h" +#include "ovs-thread.h" +#include "seq.h" +#include "socket-util.h" +#include "timeval.h" +#include "openvswitch/vlog.h" +#include "openvswitch/hmap.h" +#include "hash.h" + +VLOG_DEFINE_THIS_MODULE(poll_loop); + +COVERAGE_DEFINE(poll_create_node); +COVERAGE_DEFINE(poll_zero_timeout); + +#define POLLFD_INCREMENT 16; + +/* The poll_node structures are used solely as metadata for + * the pollfd array associated with the loop. That pollfd + * array is persistent and does not need to be regenerated + * on every iteration. + */ + +struct poll_node { + struct hmap_node hmap_node; + int index; /* index in the pollfd array */ + const char *where; /* Where poll_node was created. */ +}; + +struct poll_loop { + /* All active poll waiters. */ + struct hmap poll_nodes; + + /* Time at which to wake up the next call to poll_block(), LLONG_MIN to + * wake up immediately, or LLONG_MAX to wait forever. */ + long long int timeout_when; /* In msecs as returned by time_msec(). */ + const char *timeout_where; /* Where 'timeout_when' was set. */ + struct pollfd * watched; /* list of descriptors and event masks passed to poll */ + int watched_size; /* size of the watched allocation */ +}; + +static struct poll_loop *poll_loop(void); + +/* Look up the node with same fd or wevent. */ +static struct poll_node * +find_poll_node(struct poll_loop *loop, int fd) +{ + struct poll_node *node; + + HMAP_FOR_EACH_WITH_HASH (node, hmap_node, + hash_2words(fd, 0), + &loop->poll_nodes) { + if (fd && loop->watched[node->index].fd == fd) { + return node; + } + } + return NULL; +} + +/* On Unix based systems: + * + * Registers 'fd' as waiting for the specified 'events' (which should be + * POLLIN or POLLOUT or POLLIN | POLLOUT). The following call to + * poll_block() will wake up when 'fd' becomes ready for one or more of the + * requested events. The 'fd's are given to poll() function later. + * + * The event registration is one-shot: only the following call to + * poll_block() is affected. The event will need to be re-registered after + * poll_block() is called if it is to persist. + * + * ('where' is used in debug logging. Commonly one would use poll_fd_wait() to + * automatically provide the caller's source file and line number for + * 'where'.) */ + + +static void +poll_create_node(int fd, short int events, const char *where) +{ + struct poll_loop *loop = poll_loop(); + struct poll_node *node; + + COVERAGE_INC(poll_create_node); + + /* Check for duplicate. If found, "or" the events. */ + node = find_poll_node(loop, fd); + if (node) { + loop->watched[node->index].events |= events; + /* we overwrite the original where with the value for + * this invocation */ + node->where = where; + } else { + node = xzalloc(sizeof *node); + hmap_insert(&loop->poll_nodes, &node->hmap_node, + hash_2words(fd, 0)); + + /* If the hash has grown bigger than its matching pollfd array + * allocation, allocate a new one and copy all elements there + */ + if (hmap_count(&loop->poll_nodes) > loop->watched_size) { + struct pollfd *resized_watched; + + loop->watched_size += POLLFD_INCREMENT; + resized_watched = xzalloc(sizeof(struct pollfd) * loop->watched_size); + memcpy(resized_watched, loop->watched, sizeof(struct pollfd) * (loop->watched_size - 1)); + free(loop->watched); + loop->watched = resized_watched; + } + /* insert the new record at the end of the pollfd array */ + node->index = hmap_count(&loop->poll_nodes) - 1; + loop->watched[node->index].fd = fd; + loop->watched[node->index].events = events | POLLHUP | POLLERR; + node->where = where; + } +} + +/* Registers 'fd' as waiting for the specified 'events' (which should be POLLIN + * or POLLOUT or POLLIN | POLLOUT). The following call to poll_block() will + * wake up when 'fd' becomes ready for one or more of the requested events. + * + * The event registration is one-shot: only the following call to poll_block() + * is affected. The event will need to be re-registered after poll_block() is + * called if it is to persist. + * + * ('where' is used in debug logging. Commonly one would use poll_fd_wait() to + * automatically provide the caller's source file and line number for + * 'where'.) */ +void +poll_fd_wait_at(int fd, short int events, const char *where) +{ + poll_create_node(fd, events, where); +} + +/* Causes the following call to poll_block() to block for no more than 'msec' + * milliseconds. If 'msec' is nonpositive, the following call to poll_block() + * will not block at all. + * + * The timer registration is one-shot: only the following call to poll_block() + * is affected. The timer will need to be re-registered after poll_block() is + * called if it is to persist. + * + * ('where' is used in debug logging. Commonly one would use poll_timer_wait() + * to automatically provide the caller's source file and line number for + * 'where'.) */ +void +poll_timer_wait_at(long long int msec, const char *where) +{ + long long int now = time_msec(); + long long int when; + + if (msec <= 0) { + /* Wake up immediately. */ + when = LLONG_MIN; + } else if ((unsigned long long int) now + msec <= LLONG_MAX) { + /* Normal case. */ + when = now + msec; + } else { + /* now + msec would overflow. */ + when = LLONG_MAX; + } + + poll_timer_wait_until_at(when, where); +} + +/* Causes the following call to poll_block() to wake up when the current time, + * as returned by time_msec(), reaches 'when' or later. If 'when' is earlier + * than the current time, the following call to poll_block() will not block at + * all. + * + * The timer registration is one-shot: only the following call to poll_block() + * is affected. The timer will need to be re-registered after poll_block() is + * called if it is to persist. + * + * ('where' is used in debug logging. Commonly one would use + * poll_timer_wait_until() to automatically provide the caller's source file + * and line number for 'where'.) */ +void +poll_timer_wait_until_at(long long int when, const char *where) +{ + struct poll_loop *loop = poll_loop(); + if (when < loop->timeout_when) { + loop->timeout_when = when; + loop->timeout_where = where; + } +} + +/* Causes the following call to poll_block() to wake up immediately, without + * blocking. + * + * ('where' is used in debug logging. Commonly one would use + * poll_immediate_wake() to automatically provide the caller's source file and + * line number for 'where'.) */ +void +poll_immediate_wake_at(const char *where) +{ + poll_timer_wait_at(0, where); +} + +/* Logs, if appropriate, that the poll loop was awakened by an event + * registered at 'where' (typically a source file and line number). The other + * arguments have two possible interpretations: + * + * - If 'pollfd' is nonnull then it should be the "struct pollfd" that caused + * the wakeup. 'timeout' is ignored. + * + * - If 'pollfd' is NULL then 'timeout' is the number of milliseconds after + * which the poll loop woke up. + */ +static void +log_wakeup(const char *where, const struct pollfd *pollfd, int timeout) +{ + static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(10, 10); + enum vlog_level level; + int cpu_usage; + struct ds s; + + cpu_usage = get_cpu_usage(); + if (VLOG_IS_DBG_ENABLED()) { + level = VLL_DBG; + } else if (cpu_usage > 50 + && !thread_is_pmd() + && !VLOG_DROP_INFO(&rl)) { + level = VLL_INFO; + } else { + return; + } + + ds_init(&s); + ds_put_cstr(&s, "wakeup due to "); + if (pollfd) { + char *description = describe_fd(pollfd->fd); + if (pollfd->revents & POLLIN) { + ds_put_cstr(&s, "[POLLIN]"); + } + if (pollfd->revents & POLLOUT) { + ds_put_cstr(&s, "[POLLOUT]"); + } + if (pollfd->revents & POLLERR) { + ds_put_cstr(&s, "[POLLERR]"); + } + if (pollfd->revents & POLLHUP) { + ds_put_cstr(&s, "[POLLHUP]"); + } + if (pollfd->revents & POLLNVAL) { + ds_put_cstr(&s, "[POLLNVAL]"); + } + ds_put_format(&s, " on fd %d (%s)", pollfd->fd, description); + free(description); + } else { + ds_put_format(&s, "%d-ms timeout", timeout); + } + if (where) { + ds_put_format(&s, " at %s", where); + } + if (cpu_usage >= 0) { + ds_put_format(&s, " (%d%% CPU usage)", cpu_usage); + } + VLOG(level, "%s", ds_cstr(&s)); + ds_destroy(&s); +} + +static void +free_poll_nodes(struct poll_loop *loop) +{ + struct poll_node *node, *next; + + HMAP_FOR_EACH_SAFE (node, next, hmap_node, &loop->poll_nodes) { + hmap_remove(&loop->poll_nodes, &node->hmap_node); + free(node); + } +} + +/* Blocks until one or more of the events registered with poll_fd_wait() + * occurs, or until the minimum duration registered with poll_timer_wait() + * elapses, or not at all if poll_immediate_wake() has been called. */ +void +poll_block(void) +{ + struct poll_loop *loop = poll_loop(); + struct poll_node *node, *moved_node; + int elapsed; + int retval; + int i; + + /* Register fatal signal events before actually doing any real work for + * poll_block. */ + fatal_signal_wait(); + + if (loop->timeout_when == LLONG_MIN) { + COVERAGE_INC(poll_zero_timeout); + } + + timewarp_run(); + + /* We do not need to pre-process the pollfd array in any way - it is + * ready for use. + */ + + retval = time_poll(loop->watched, hmap_count(&loop->poll_nodes), NULL, + loop->timeout_when, &elapsed); + if (retval < 0) { + static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 5); + VLOG_ERR_RL(&rl, "poll: %s", ovs_strerror(-retval)); + } else if (!retval) { + log_wakeup(loop->timeout_where, NULL, elapsed); + } else if (get_cpu_usage() > 50 || VLOG_IS_DBG_ENABLED()) { + for (i = 0; i < hmap_count(&loop->poll_nodes); i++) { + if (loop->watched[i].revents) { + node = find_poll_node(loop, loop->watched[i].fd); + ovs_assert(node != NULL); + log_wakeup(node->where, &loop->watched[i], 0); + } + } + } + + /* Update the pollfd array to reproduce one-shot behaviour + * and reap any fds which have been closed in the meantime + */ + + i = 0; + while (i < hmap_count(&loop->poll_nodes)) { + node = find_poll_node(loop, loop->watched[i].fd); + ovs_assert(node != NULL); + if (loop->watched[i].revents & (POLLHUP | POLLNVAL)) { + /* FD was closed - reap */ + if (i < (hmap_count(&loop->poll_nodes) - 1)) { + /* move last record to this index position */ + moved_node = find_poll_node( + loop, + loop->watched[hmap_count(&loop->poll_nodes) - 1].fd); + ovs_assert(moved_node != NULL); + loop->watched[i] = loop->watched[hmap_count(&loop->poll_nodes) - 1]; + moved_node->index = i; + } + hmap_remove(&loop->poll_nodes, &node->hmap_node); + /* note - we do not i++ here as we have not processed the node + * which we have moved from the tail of the array into the hole + */ + } else { + /* Clear events to replicate one-shot behaviour. Leave file + * close related events intact so we can track file closures + */ + loop->watched[i].events = (POLLHUP & POLLERR); + i++; + } + } + + loop->timeout_when = LLONG_MAX; + loop->timeout_where = NULL; + + /* Handle any pending signals before doing anything else. */ + fatal_signal_run(); + + seq_woke(); +} + +static void +free_poll_loop(void *loop_) +{ + struct poll_loop *loop = loop_; + + free_poll_nodes(loop); + hmap_destroy(&loop->poll_nodes); + free(loop->watched); + free(loop); +} + +static struct poll_loop * +poll_loop(void) +{ + static struct ovsthread_once once = OVSTHREAD_ONCE_INITIALIZER; + static pthread_key_t key; + struct poll_loop *loop; + + if (ovsthread_once_start(&once)) { + xpthread_key_create(&key, free_poll_loop); + ovsthread_once_done(&once); + } + + loop = pthread_getspecific(key); + if (!loop) { + loop = xzalloc(sizeof *loop); + loop->timeout_when = LLONG_MAX; + hmap_init(&loop->poll_nodes); + loop->watched_size = POLLFD_INCREMENT; + loop->watched = xzalloc(sizeof(struct pollfd) * loop->watched_size); + xpthread_setspecific(key, loop); + } + return loop; +} diff --git a/lib/poll-loop.c b/lib/poll-loop.c index 4e751ff2c..0eef47ae8 100644 --- a/lib/poll-loop.c +++ b/lib/poll-loop.c @@ -77,14 +77,7 @@ find_poll_node(struct poll_loop *loop, int fd, HANDLE wevent) return NULL; } -/* On Unix based systems: - * - * Registers 'fd' as waiting for the specified 'events' (which should be - * POLLIN or POLLOUT or POLLIN | POLLOUT). The following call to - * poll_block() will wake up when 'fd' becomes ready for one or more of the - * requested events. The 'fd's are given to poll() function later. - * - * On Windows system: +/* On Windows system: * * If 'fd' is specified, create a new 'wevent'. Association of 'fd' and * 'wevent' for 'events' happens in poll_block(). If 'wevent' is specified, @@ -120,11 +113,9 @@ poll_create_node(int fd, HANDLE wevent, short int events, const char *where) hash_2words(fd, (uint32_t)wevent)); node->pollfd.fd = fd; node->pollfd.events = events; -#ifdef _WIN32 if (!wevent) { wevent = CreateEvent(NULL, FALSE, FALSE, NULL); } -#endif node->wevent = wevent; node->where = where; } @@ -149,7 +140,6 @@ poll_fd_wait_at(int fd, short int events, const char *where) poll_create_node(fd, 0, events, where); } -#ifdef _WIN32 /* Registers for the next call to poll_block() to wake up when 'wevent' is * signaled. * @@ -165,7 +155,6 @@ poll_wevent_wait_at(HANDLE wevent, const char *where) { poll_create_node(0, wevent, 0, where); } -#endif /* _WIN32 */ /* Causes the following call to poll_block() to block for no more than 'msec' * milliseconds. If 'msec' is nonpositive, the following call to poll_block() @@ -302,12 +291,10 @@ free_poll_nodes(struct poll_loop *loop) HMAP_FOR_EACH_SAFE (node, next, hmap_node, &loop->poll_nodes) { hmap_remove(&loop->poll_nodes, &node->hmap_node); -#ifdef _WIN32 if (node->wevent && node->pollfd.fd) { WSAEventSelect(node->pollfd.fd, NULL, 0); CloseHandle(node->wevent); } -#endif free(node); } } @@ -337,15 +324,12 @@ poll_block(void) timewarp_run(); pollfds = xmalloc(hmap_count(&loop->poll_nodes) * sizeof *pollfds); -#ifdef _WIN32 wevents = xmalloc(hmap_count(&loop->poll_nodes) * sizeof *wevents); -#endif /* Populate with all the fds and events. */ i = 0; HMAP_FOR_EACH (node, hmap_node, &loop->poll_nodes) { pollfds[i] = node->pollfd; -#ifdef _WIN32 wevents[i] = node->wevent; if (node->pollfd.fd && node->wevent) { short int wsa_events = 0; @@ -357,7 +341,6 @@ poll_block(void) } WSAEventSelect(node->pollfd.fd, node->wevent, wsa_events); } -#endif i++; } From patchwork Mon Jul 6 08:20:10 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Anton Ivanov X-Patchwork-Id: 1323421 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=openvswitch.org (client-ip=140.211.166.137; helo=fraxinus.osuosl.org; envelope-from=ovs-dev-bounces@openvswitch.org; receiver=) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=cambridgegreys.com Received: from fraxinus.osuosl.org (smtp4.osuosl.org [140.211.166.137]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 4B0dn03klZz9sQt for ; Mon, 6 Jul 2020 18:20:52 +1000 (AEST) Received: from localhost (localhost [127.0.0.1]) by fraxinus.osuosl.org (Postfix) with ESMTP id 13FE986CFC; Mon, 6 Jul 2020 08:20:51 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from fraxinus.osuosl.org ([127.0.0.1]) by localhost (.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id n0-74JZiqnQF; Mon, 6 Jul 2020 08:20:46 +0000 (UTC) Received: from lists.linuxfoundation.org (lf-lists.osuosl.org [140.211.9.56]) by fraxinus.osuosl.org (Postfix) with ESMTP id 0A22D86CF5; Mon, 6 Jul 2020 08:20:43 +0000 (UTC) Received: from lf-lists.osuosl.org (localhost [127.0.0.1]) by lists.linuxfoundation.org (Postfix) with ESMTP id D083DC08A9; Mon, 6 Jul 2020 08:20:42 +0000 (UTC) X-Original-To: dev@openvswitch.org Delivered-To: ovs-dev@lists.linuxfoundation.org Received: from whitealder.osuosl.org (smtp1.osuosl.org [140.211.166.138]) by lists.linuxfoundation.org (Postfix) with ESMTP id 09D5CC016F for ; Mon, 6 Jul 2020 08:20:41 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by whitealder.osuosl.org (Postfix) with ESMTP id 051CD87FDD for ; Mon, 6 Jul 2020 08:20:41 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from whitealder.osuosl.org ([127.0.0.1]) by localhost (.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id DB9+WQUbq-p6 for ; Mon, 6 Jul 2020 08:20:39 +0000 (UTC) X-Greylist: from auto-whitelisted by SQLgrey-1.7.6 Received: from www.kot-begemot.co.uk (ivanoab7.miniserver.com [37.128.132.42]) by whitealder.osuosl.org (Postfix) with ESMTPS id 04F4587F59 for ; Mon, 6 Jul 2020 08:20:38 +0000 (UTC) Received: from tun252.jain.kot-begemot.co.uk ([192.168.18.6] helo=jain.kot-begemot.co.uk) by www.kot-begemot.co.uk with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1jsMMe-00068p-NY for dev@openvswitch.org; Mon, 06 Jul 2020 08:20:37 +0000 Received: from jain.kot-begemot.co.uk ([192.168.3.3]) by jain.kot-begemot.co.uk with esmtp (Exim 4.92) (envelope-from ) id 1jsMMb-0007Tb-Kf; Mon, 06 Jul 2020 09:20:35 +0100 From: anton.ivanov@cambridgegreys.com To: dev@openvswitch.org Date: Mon, 6 Jul 2020 09:20:10 +0100 Message-Id: <20200706082013.27446-3-anton.ivanov@cambridgegreys.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20200706082013.27446-1-anton.ivanov@cambridgegreys.com> References: <20200706082013.27446-1-anton.ivanov@cambridgegreys.com> MIME-Version: 1.0 X-Clacks-Overhead: GNU Terry Pratchett Cc: Anton Ivanov Subject: [ovs-dev] [PATCH 2/6] Enable kernel probes and map stream probes onto them X-BeenThere: ovs-dev@openvswitch.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: ovs-dev-bounces@openvswitch.org Sender: "dev" From: Anton Ivanov 1. Fix probe logic. The stream_or_pstream_needs_probes function returning a mix of integer and boolean. As a result probes were NOT turned off in a number of cases on unix domain sockets and other transports where there should be no probing. It now returns -1 (do not know), 0 (no probe needed), 1 (definitely needs probes). 2. Allow delegating probing to keepalive facilities in the stream layer if avaialable. 3. Provide TCP KEEPALIVE probing at stream layer on supported platforms for stream-ssl and stream-tcp. Signed-off-by: Anton Ivanov --- lib/jsonrpc.c | 36 +++++++++++++++++++++++++++++++- lib/socket-util.c | 48 +++++++++++++++++++++++++++++++++++++++++++ lib/socket-util.h | 8 ++++++++ lib/stream-fd.c | 9 ++++++++ lib/stream-provider.h | 6 ++++++ lib/stream-ssl.c | 8 ++++++++ lib/stream-tcp.c | 1 + lib/stream-unix.c | 6 ++++++ lib/stream-windows.c | 1 + lib/stream.c | 26 +++++++++++++++++------ lib/stream.h | 3 ++- 11 files changed, 144 insertions(+), 8 deletions(-) diff --git a/lib/jsonrpc.c b/lib/jsonrpc.c index ed748dbde..830b9910f 100644 --- a/lib/jsonrpc.c +++ b/lib/jsonrpc.c @@ -787,6 +787,7 @@ struct jsonrpc_session { int last_error; unsigned int seqno; uint8_t dscp; + int probe_interval; }; static void @@ -839,6 +840,7 @@ jsonrpc_session_open_multiple(const struct svec *remotes, bool retry) s->seqno = 0; s->dscp = 0; s->last_error = 0; + s->probe_interval = reconnect_get_probe_interval(s->reconnect); const char *name = reconnect_get_name(s->reconnect); if (!pstream_verify_name(name)) { @@ -850,6 +852,7 @@ jsonrpc_session_open_multiple(const struct svec *remotes, bool retry) if (!stream_or_pstream_needs_probes(name)) { reconnect_set_probe_interval(s->reconnect, 0); + s->probe_interval = 0; } return s; @@ -879,6 +882,12 @@ jsonrpc_session_open_unreliably(struct jsonrpc *jsonrpc, uint8_t dscp) s->stream = NULL; s->pstream = NULL; s->seqno = 1; + s->probe_interval = reconnect_get_probe_interval(s->reconnect); + + if (!stream_or_pstream_needs_probes(reconnect_get_name(s->reconnect))) { + reconnect_set_probe_interval(s->reconnect, 0); + s->probe_interval = 0; + } return s; } @@ -934,6 +943,12 @@ jsonrpc_session_connect(struct jsonrpc_session *s) error = jsonrpc_stream_open(name, &s->stream, s->dscp); if (!error) { reconnect_connecting(s->reconnect, time_msec()); + if (stream_set_probe_interval(s->stream, s->probe_interval)) { + /* we have delegated probing to the stream layer */ + reconnect_set_probe_interval(s->reconnect, 0); + } else { + reconnect_set_probe_interval(s->reconnect, s->probe_interval); + } } else { s->last_error = error; } @@ -967,6 +982,12 @@ jsonrpc_session_run(struct jsonrpc_session *s) jsonrpc_session_disconnect(s); } reconnect_connected(s->reconnect, time_msec()); + if (stream_set_probe_interval(stream, s->probe_interval)) { + /* we have delegated probing to the stream layer */ + reconnect_set_probe_interval(s->reconnect, 0); + } else { + reconnect_set_probe_interval(s->reconnect, s->probe_interval); + } s->rpc = jsonrpc_open(stream); s->seqno++; } else if (error != EAGAIN) { @@ -1008,6 +1029,12 @@ jsonrpc_session_run(struct jsonrpc_session *s) if (!error) { reconnect_connected(s->reconnect, time_msec()); s->rpc = jsonrpc_open(s->stream); + if (stream_set_probe_interval(s->stream, s->probe_interval)) { + /* we have delegated probing to the stream layer */ + reconnect_set_probe_interval(s->reconnect, 0); + } else { + reconnect_set_probe_interval(s->reconnect, s->probe_interval); + } s->stream = NULL; s->seqno++; } else if (error != EAGAIN) { @@ -1231,7 +1258,14 @@ void jsonrpc_session_set_probe_interval(struct jsonrpc_session *s, int probe_interval) { - reconnect_set_probe_interval(s->reconnect, probe_interval); + s->probe_interval = probe_interval; + if (s->stream) { + if (stream_set_probe_interval(s->stream, probe_interval)) { + reconnect_set_probe_interval(s->reconnect, 0); + } else { + reconnect_set_probe_interval(s->reconnect, probe_interval); + } + } } /* Sets the DSCP value used for 's''s connection to 'dscp'. If this is diff --git a/lib/socket-util.c b/lib/socket-util.c index 4f1ffecf5..3aad89d23 100644 --- a/lib/socket-util.c +++ b/lib/socket-util.c @@ -114,6 +114,54 @@ setsockopt_tcp_nodelay(int fd) } } +#ifdef HAS_KERNEL_KEEPALIVES +bool tcp_set_probe_interval(int fd, int probe_interval) { + int on = 1; + int retval; + int value; + + on = 1; + retval = setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, &on, sizeof on); + if (retval) { + retval = sock_errno(); + VLOG_DBG("setsockopt(SO_KEEPALIVE): %s", sock_strerror(retval)); + return false; + } + value = 2; + retval = setsockopt(fd, + IPPROTO_TCP, TCP_KEEPCNT, &value, sizeof value); + if (retval) { + retval = sock_errno(); + VLOG_DBG("setsockopt(TCP_KEEPCNT): %s", sock_strerror(retval)); + goto params_failed; + } + value = probe_interval; + retval = setsockopt(fd, + IPPROTO_TCP, TCP_KEEPIDLE, &value, sizeof value); + if (retval) { + retval = sock_errno(); + VLOG_DBG("setsockopt(TCP_KEEPIDLE): %s", sock_strerror(retval)); + goto params_failed; + } + value = probe_interval; + retval = setsockopt(fd, + IPPROTO_TCP, TCP_KEEPINTVL, &value, sizeof value); + if (retval) { + retval = sock_errno(); + VLOG_DBG("setsockopt(SO_KEEPALIVE): %s", sock_strerror(retval)); + goto params_failed; + } + return true; +params_failed: + on = 0; + retval = setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, &on, sizeof on); + return false; +#else +bool tcp_set_probe_interval(int fd OVS_UNUSED, int probe_interval OVS_UNUSED) { + return false; +#endif +} + /* Sets the DSCP value of socket 'fd' to 'dscp', which must be 63 or less. * 'family' must indicate the socket's address family (AF_INET or AF_INET6, to * do anything useful). */ diff --git a/lib/socket-util.h b/lib/socket-util.h index 9ccb7d4cc..2439e2f78 100644 --- a/lib/socket-util.h +++ b/lib/socket-util.h @@ -27,6 +27,7 @@ #include "openvswitch/types.h" #include #include +#include struct ds; @@ -181,4 +182,11 @@ static inline int sock_errno(void) #endif } +#if defined (SO_KEEPALIVE) && defined (TCP_KEEPCNT) && \ + defined (TCP_KEEPIDLE) && defined (TCP_KEEPINTVL) +#define HAS_KERNEL_KEEPALIVES 1 +#endif + +bool tcp_set_probe_interval(int fd, int probe_interval); + #endif /* socket-util.h */ diff --git a/lib/stream-fd.c b/lib/stream-fd.c index 46ee7ae27..30622929b 100644 --- a/lib/stream-fd.c +++ b/lib/stream-fd.c @@ -162,6 +162,14 @@ fd_wait(struct stream *stream, enum stream_wait_type wait) } } +static bool fd_set_probe_interval(struct stream *stream, int probe_interval) { + struct stream_fd *sf = stream_fd_cast(stream); + + return tcp_set_probe_interval(sf->fd, probe_interval); +} + + + static const struct stream_class stream_fd_class = { "fd", /* name */ false, /* needs_probes */ @@ -173,6 +181,7 @@ static const struct stream_class stream_fd_class = { NULL, /* run */ NULL, /* run_wait */ fd_wait, /* wait */ + fd_set_probe_interval, /* set_probe_interval */ }; /* Passive file descriptor stream. */ diff --git a/lib/stream-provider.h b/lib/stream-provider.h index 75f4f059b..6c28cb50b 100644 --- a/lib/stream-provider.h +++ b/lib/stream-provider.h @@ -124,6 +124,12 @@ struct stream_class { /* Arranges for the poll loop to wake up when 'stream' is ready to take an * action of the given 'type'. */ void (*wait)(struct stream *stream, enum stream_wait_type type); + /* Sets low level keepalives if supported + * + * If successful returns true + * + */ + bool (*set_probe_interval)(struct stream *stream, int probe_interval); }; /* Passive listener for incoming stream connections. diff --git a/lib/stream-ssl.c b/lib/stream-ssl.c index 078fcbc3a..575c55f5b 100644 --- a/lib/stream-ssl.c +++ b/lib/stream-ssl.c @@ -789,6 +789,13 @@ ssl_run(struct stream *stream) } } +static bool ssl_set_probe_interval(struct stream *stream, int probe_interval) { + struct ssl_stream *sslv = ssl_stream_cast(stream); + + return tcp_set_probe_interval(sslv->fd, probe_interval); +} + + static void ssl_run_wait(struct stream *stream) { @@ -861,6 +868,7 @@ const struct stream_class ssl_stream_class = { ssl_run, /* run */ ssl_run_wait, /* run_wait */ ssl_wait, /* wait */ + ssl_set_probe_interval, /* set_probe_interval */ }; /* Passive SSL. */ diff --git a/lib/stream-tcp.c b/lib/stream-tcp.c index e8dc2bfaa..67c912105 100644 --- a/lib/stream-tcp.c +++ b/lib/stream-tcp.c @@ -73,6 +73,7 @@ const struct stream_class tcp_stream_class = { NULL, /* run */ NULL, /* run_wait */ NULL, /* wait */ + NULL, }; /* Passive TCP. */ diff --git a/lib/stream-unix.c b/lib/stream-unix.c index d265efb83..4e96720ab 100644 --- a/lib/stream-unix.c +++ b/lib/stream-unix.c @@ -62,6 +62,11 @@ unix_open(const char *name, char *suffix, struct stream **streamp, AF_UNIX, streamp); } +static bool unix_set_probe_interval(struct stream *stream OVS_UNUSED, int probe_interval OVS_UNUSED) { + + return true; +} + const struct stream_class unix_stream_class = { "unix", /* name */ false, /* needs_probes */ @@ -73,6 +78,7 @@ const struct stream_class unix_stream_class = { NULL, /* run */ NULL, /* run_wait */ NULL, /* wait */ + unix_set_probe_interval, }; /* Passive UNIX socket. */ diff --git a/lib/stream-windows.c b/lib/stream-windows.c index 5c4c55e5d..836112f75 100644 --- a/lib/stream-windows.c +++ b/lib/stream-windows.c @@ -374,6 +374,7 @@ const struct stream_class windows_stream_class = { NULL, /* run */ NULL, /* run_wait */ windows_wait, /* wait */ + NULL, }; struct pwindows_pstream diff --git a/lib/stream.c b/lib/stream.c index e246b3773..9902c9ba4 100644 --- a/lib/stream.c +++ b/lib/stream.c @@ -430,6 +430,19 @@ stream_wait(struct stream *stream, enum stream_wait_type wait) (stream->class->wait)(stream, wait); } + +bool stream_set_probe_interval(struct stream *stream, int probe_interval) { + if (! stream->class->needs_probes) { + return true; + } + if (probe_interval && stream->class->set_probe_interval) { + return (stream->class->set_probe_interval)( + stream, probe_interval / 1000); + } + return false; +} + + void stream_connect_wait(struct stream *stream) { @@ -498,11 +511,13 @@ pstream_verify_name(const char *name) return pstream_lookup_class(name, &class); } -/* Returns 1 if the stream or pstream specified by 'name' needs periodic probes +/* Returns true if the stream or pstream specified by 'name' needs periodic probes * to verify connectivity. For [p]streams which need probes, it can take a - * long time to notice the connection has been dropped. Returns 0 if the - * stream or pstream does not need probes, and -1 if 'name' is not valid. */ -int + * long time to notice the connection has been dropped. Returns false if the + * stream or pstream does not need probes as well as when the name cannot + * be matched. */ + +bool stream_or_pstream_needs_probes(const char *name) { const struct pstream_class *pclass; @@ -512,9 +527,8 @@ stream_or_pstream_needs_probes(const char *name) return class->needs_probes; } else if (!pstream_lookup_class(name, &pclass)) { return pclass->needs_probes; - } else { - return -1; } + return false; } /* Attempts to start listening for remote stream connections. 'name' is a diff --git a/lib/stream.h b/lib/stream.h index 77bffa498..6765c7d15 100644 --- a/lib/stream.h +++ b/lib/stream.h @@ -40,6 +40,7 @@ const char *stream_get_name(const struct stream *); int stream_connect(struct stream *); int stream_recv(struct stream *, void *buffer, size_t n); int stream_send(struct stream *, const void *buffer, size_t n); +bool stream_set_probe_interval(struct stream *, int probe_interval); void stream_run(struct stream *); void stream_run_wait(struct stream *); @@ -80,7 +81,7 @@ int pstream_open_with_default_port(const char *name, bool stream_parse_target_with_default_port(const char *target, int default_port, struct sockaddr_storage *ss); -int stream_or_pstream_needs_probes(const char *name); +bool stream_or_pstream_needs_probes(const char *name); /* Error reporting. */ From patchwork Mon Jul 6 08:20:11 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Anton Ivanov X-Patchwork-Id: 1323418 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=openvswitch.org (client-ip=140.211.166.137; helo=fraxinus.osuosl.org; envelope-from=ovs-dev-bounces@openvswitch.org; receiver=) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=cambridgegreys.com Received: from fraxinus.osuosl.org (smtp4.osuosl.org [140.211.166.137]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 4B0dmt46fKz9sSd for ; Mon, 6 Jul 2020 18:20:46 +1000 (AEST) Received: from localhost (localhost [127.0.0.1]) by fraxinus.osuosl.org (Postfix) with ESMTP id C677F86D9D; Mon, 6 Jul 2020 08:20:44 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from fraxinus.osuosl.org ([127.0.0.1]) by localhost (.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id YDvw2G87ZPtC; Mon, 6 Jul 2020 08:20:43 +0000 (UTC) Received: from lists.linuxfoundation.org (lf-lists.osuosl.org [140.211.9.56]) by fraxinus.osuosl.org (Postfix) with ESMTP id DC3BF86D24; Mon, 6 Jul 2020 08:20:41 +0000 (UTC) Received: from lf-lists.osuosl.org (localhost [127.0.0.1]) by lists.linuxfoundation.org (Postfix) with ESMTP id BFA99C1797; Mon, 6 Jul 2020 08:20:41 +0000 (UTC) X-Original-To: dev@openvswitch.org Delivered-To: ovs-dev@lists.linuxfoundation.org Received: from fraxinus.osuosl.org (smtp4.osuosl.org [140.211.166.137]) by lists.linuxfoundation.org (Postfix) with ESMTP id 508F7C016F for ; Mon, 6 Jul 2020 08:20:40 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by fraxinus.osuosl.org (Postfix) with ESMTP id 3FFCB86B9E for ; Mon, 6 Jul 2020 08:20:40 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from fraxinus.osuosl.org ([127.0.0.1]) by localhost (.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id LOa4SwCr2a9e for ; Mon, 6 Jul 2020 08:20:39 +0000 (UTC) X-Greylist: from auto-whitelisted by SQLgrey-1.7.6 Received: from www.kot-begemot.co.uk (ivanoab7.miniserver.com [37.128.132.42]) by fraxinus.osuosl.org (Postfix) with ESMTPS id A3A7F86D16 for ; Mon, 6 Jul 2020 08:20:39 +0000 (UTC) Received: from tun252.jain.kot-begemot.co.uk ([192.168.18.6] helo=jain.kot-begemot.co.uk) by www.kot-begemot.co.uk with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1jsMMg-00068t-8z for dev@openvswitch.org; Mon, 06 Jul 2020 08:20:38 +0000 Received: from jain.kot-begemot.co.uk ([192.168.3.3]) by jain.kot-begemot.co.uk with esmtp (Exim 4.92) (envelope-from ) id 1jsMMd-0007Tb-Hl; Mon, 06 Jul 2020 09:20:37 +0100 From: anton.ivanov@cambridgegreys.com To: dev@openvswitch.org Date: Mon, 6 Jul 2020 09:20:11 +0100 Message-Id: <20200706082013.27446-4-anton.ivanov@cambridgegreys.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20200706082013.27446-1-anton.ivanov@cambridgegreys.com> References: <20200706082013.27446-1-anton.ivanov@cambridgegreys.com> MIME-Version: 1.0 X-Clacks-Overhead: GNU Terry Pratchett Cc: Anton Ivanov Subject: [ovs-dev] [PATCH 3/6] Make ByteQ safe for simultaneous producer/consumer X-BeenThere: ovs-dev@openvswitch.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: ovs-dev-bounces@openvswitch.org Sender: "dev" From: Anton Ivanov A ByteQ with unlocked head and tail is unsafe for simultaneous consume/produce. If simultaneous use is desired, these either need to be locked or there needs to be a third atomic or lock guarded variable "used". An atomic "used" allows the producer to enqueue safely because it "owns" the head and even if the consumer changes the head it will only increase the space available versus the value in "used". Once the data has been written and the enqueued should be made visible it fenced and the used is updated. Similar for "consumer" - it can safely consume now as it "owns" tail and never reads beyond tail + used (wrapped around as needed). Signed-off-by: Anton Ivanov --- lib/byteq.c | 17 ++++++++++++++++- lib/byteq.h | 7 ++++++- 2 files changed, 22 insertions(+), 2 deletions(-) diff --git a/lib/byteq.c b/lib/byteq.c index 3f865cf9e..da40c2530 100644 --- a/lib/byteq.c +++ b/lib/byteq.c @@ -19,6 +19,7 @@ #include #include #include "util.h" +#include "ovs-atomic.h" /* Initializes 'q' as an empty byteq that uses the 'size' bytes of 'buffer' to * store data. 'size' must be a power of 2. @@ -32,13 +33,16 @@ byteq_init(struct byteq *q, uint8_t *buffer, size_t size) q->buffer = buffer; q->size = size; q->head = q->tail = 0; + q->used = ATOMIC_VAR_INIT(0); } /* Returns the number of bytes current queued in 'q'. */ int byteq_used(const struct byteq *q) { - return q->head - q->tail; + int retval; + atomic_read_relaxed(&q->used, &retval); + return retval; } /* Returns the number of bytes that can be added to 'q' without overflow. */ @@ -68,9 +72,11 @@ byteq_is_full(const struct byteq *q) void byteq_put(struct byteq *q, uint8_t c) { + int discard; ovs_assert(!byteq_is_full(q)); *byteq_head(q) = c; q->head++; + atomic_add(&q->used, 1, &discard); } /* Adds the 'n' bytes in 'p' at the head of 'q', which must have at least 'n' @@ -79,6 +85,7 @@ void byteq_putn(struct byteq *q, const void *p_, size_t n) { const uint8_t *p = p_; + int discard; ovs_assert(byteq_avail(q) >= n); while (n > 0) { size_t chunk = MIN(n, byteq_headroom(q)); @@ -86,6 +93,7 @@ byteq_putn(struct byteq *q, const void *p_, size_t n) byteq_advance_head(q, chunk); p += chunk; n -= chunk; + atomic_add(&q->used, chunk, &discard); } } @@ -103,9 +111,11 @@ uint8_t byteq_get(struct byteq *q) { uint8_t c; + int discard; ovs_assert(!byteq_is_empty(q)); c = *byteq_tail(q); q->tail++; + atomic_sub(&q->used, 1, &discard); return c; } @@ -168,8 +178,10 @@ byteq_tail(const struct byteq *q) void byteq_advance_tail(struct byteq *q, unsigned int n) { + int discard; ovs_assert(byteq_tailroom(q) >= n); q->tail += n; + atomic_sub_relaxed(&q->used, n, &discard); } /* Returns the byte after the last in-use byte of 'q', the point at which new @@ -195,6 +207,9 @@ byteq_headroom(const struct byteq *q) void byteq_advance_head(struct byteq *q, unsigned int n) { + int discard; ovs_assert(byteq_headroom(q) >= n); q->head += n; + atomic_thread_fence(memory_order_release); + atomic_add_relaxed(&q->used, n, &discard); } diff --git a/lib/byteq.h b/lib/byteq.h index d73e3684e..5078dd7a4 100644 --- a/lib/byteq.h +++ b/lib/byteq.h @@ -19,13 +19,18 @@ #include #include #include +#include "ovs-atomic.h" -/* General-purpose circular queue of bytes. */ +/* General-purpose circular queue of bytes. + * Thread safe for simultaneous use by a SINGLE producer and SINGLE + * consumer (1:1). + */ struct byteq { uint8_t *buffer; /* Circular queue. */ unsigned int size; /* Number of bytes allocated for 'buffer'. */ unsigned int head; /* Head of queue. */ unsigned int tail; /* Chases the head. */ + atomic_int used; }; void byteq_init(struct byteq *, uint8_t *buffer, size_t size); From patchwork Mon Jul 6 08:20:12 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Anton Ivanov X-Patchwork-Id: 1323420 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=openvswitch.org (client-ip=140.211.166.137; helo=fraxinus.osuosl.org; envelope-from=ovs-dev-bounces@openvswitch.org; receiver=) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=cambridgegreys.com Received: from fraxinus.osuosl.org (smtp4.osuosl.org [140.211.166.137]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 4B0dmz295fz9sQt for ; Mon, 6 Jul 2020 18:20:51 +1000 (AEST) Received: from localhost (localhost [127.0.0.1]) by fraxinus.osuosl.org (Postfix) with ESMTP id A4B6486D76; Mon, 6 Jul 2020 08:20:49 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from fraxinus.osuosl.org ([127.0.0.1]) by localhost (.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Vtcl366joxil; Mon, 6 Jul 2020 08:20:48 +0000 (UTC) Received: from lists.linuxfoundation.org (lf-lists.osuosl.org [140.211.9.56]) by fraxinus.osuosl.org (Postfix) with ESMTP id F192E86D78; Mon, 6 Jul 2020 08:20:43 +0000 (UTC) Received: from lf-lists.osuosl.org (localhost [127.0.0.1]) by lists.linuxfoundation.org (Postfix) with ESMTP id BD63DC08A9; Mon, 6 Jul 2020 08:20:43 +0000 (UTC) X-Original-To: dev@openvswitch.org Delivered-To: ovs-dev@lists.linuxfoundation.org Received: from hemlock.osuosl.org (smtp2.osuosl.org [140.211.166.133]) by lists.linuxfoundation.org (Postfix) with ESMTP id 1F143C0893 for ; Mon, 6 Jul 2020 08:20:42 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by hemlock.osuosl.org (Postfix) with ESMTP id 1C2D48869A for ; Mon, 6 Jul 2020 08:20:42 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from hemlock.osuosl.org ([127.0.0.1]) by localhost (.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id nxGLS+KoOaYX for ; Mon, 6 Jul 2020 08:20:41 +0000 (UTC) X-Greylist: from auto-whitelisted by SQLgrey-1.7.6 Received: from www.kot-begemot.co.uk (ivanoab7.miniserver.com [37.128.132.42]) by hemlock.osuosl.org (Postfix) with ESMTPS id 570DE88672 for ; Mon, 6 Jul 2020 08:20:41 +0000 (UTC) Received: from tun252.jain.kot-begemot.co.uk ([192.168.18.6] helo=jain.kot-begemot.co.uk) by www.kot-begemot.co.uk with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1jsMMh-00068x-VH for dev@openvswitch.org; Mon, 06 Jul 2020 08:20:40 +0000 Received: from jain.kot-begemot.co.uk ([192.168.3.3]) by jain.kot-begemot.co.uk with esmtp (Exim 4.92) (envelope-from ) id 1jsMMf-0007Tb-96; Mon, 06 Jul 2020 09:20:38 +0100 From: anton.ivanov@cambridgegreys.com To: dev@openvswitch.org Date: Mon, 6 Jul 2020 09:20:12 +0100 Message-Id: <20200706082013.27446-5-anton.ivanov@cambridgegreys.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20200706082013.27446-1-anton.ivanov@cambridgegreys.com> References: <20200706082013.27446-1-anton.ivanov@cambridgegreys.com> MIME-Version: 1.0 X-Clacks-Overhead: GNU Terry Pratchett Cc: Anton Ivanov Subject: [ovs-dev] [PATCH 4/6] Fixes for build with extra warnings X-BeenThere: ovs-dev@openvswitch.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: ovs-dev-bounces@openvswitch.org Sender: "dev" From: Anton Ivanov Signed-off-by: Anton Ivanov --- lib/byteq.c | 14 +++++++------- lib/byteq.h | 12 ++++++------ 2 files changed, 13 insertions(+), 13 deletions(-) diff --git a/lib/byteq.c b/lib/byteq.c index da40c2530..8a7b4f1dc 100644 --- a/lib/byteq.c +++ b/lib/byteq.c @@ -38,16 +38,16 @@ byteq_init(struct byteq *q, uint8_t *buffer, size_t size) /* Returns the number of bytes current queued in 'q'. */ int -byteq_used(const struct byteq *q) +byteq_used(struct byteq *q) { - int retval; + atomic_int retval; atomic_read_relaxed(&q->used, &retval); return retval; } /* Returns the number of bytes that can be added to 'q' without overflow. */ int -byteq_avail(const struct byteq *q) +byteq_avail(struct byteq *q) { return q->size - byteq_used(q); } @@ -55,7 +55,7 @@ byteq_avail(const struct byteq *q) /* Returns true if no bytes are queued in 'q', * false if at least one byte is queued. */ bool -byteq_is_empty(const struct byteq *q) +byteq_is_empty(struct byteq *q) { return !byteq_used(q); } @@ -63,7 +63,7 @@ byteq_is_empty(const struct byteq *q) /* Returns true if 'q' has no room to queue additional bytes, * false if 'q' has room for at least one more byte. */ bool -byteq_is_full(const struct byteq *q) +byteq_is_full(struct byteq *q) { return !byteq_avail(q); } @@ -158,7 +158,7 @@ byteq_read(struct byteq *q, int fd) /* Returns the number of contiguous bytes of in-use space starting at the tail * of 'q'. */ int -byteq_tailroom(const struct byteq *q) +byteq_tailroom(struct byteq *q) { int used = byteq_used(q); int tail_to_end = q->size - (q->tail & (q->size - 1)); @@ -195,7 +195,7 @@ byteq_head(struct byteq *q) /* Returns the number of contiguous bytes of free space starting at the head * of 'q'. */ int -byteq_headroom(const struct byteq *q) +byteq_headroom(struct byteq *q) { int avail = byteq_avail(q); int head_to_end = q->size - (q->head & (q->size - 1)); diff --git a/lib/byteq.h b/lib/byteq.h index 5078dd7a4..0128f2f1d 100644 --- a/lib/byteq.h +++ b/lib/byteq.h @@ -34,10 +34,10 @@ struct byteq { }; void byteq_init(struct byteq *, uint8_t *buffer, size_t size); -int byteq_used(const struct byteq *); -int byteq_avail(const struct byteq *); -bool byteq_is_empty(const struct byteq *); -bool byteq_is_full(const struct byteq *); +int byteq_used(struct byteq *); +int byteq_avail(struct byteq *); +bool byteq_is_empty(struct byteq *); +bool byteq_is_full(struct byteq *); void byteq_put(struct byteq *, uint8_t c); void byteq_putn(struct byteq *, const void *, size_t n); void byteq_put_string(struct byteq *, const char *); @@ -46,9 +46,9 @@ int byteq_write(struct byteq *, int fd); int byteq_read(struct byteq *, int fd); uint8_t *byteq_head(struct byteq *); -int byteq_headroom(const struct byteq *); +int byteq_headroom(struct byteq *); void byteq_advance_head(struct byteq *, unsigned int n); -int byteq_tailroom(const struct byteq *); +int byteq_tailroom(struct byteq *); const uint8_t *byteq_tail(const struct byteq *); void byteq_advance_tail(struct byteq *, unsigned int n); From patchwork Mon Jul 6 08:20:13 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Anton Ivanov X-Patchwork-Id: 1323425 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=openvswitch.org (client-ip=140.211.166.137; helo=fraxinus.osuosl.org; envelope-from=ovs-dev-bounces@openvswitch.org; receiver=) Authentication-Results: ozlabs.org; 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Mon, 6 Jul 2020 08:21:10 +0000 (UTC) X-Original-To: dev@openvswitch.org Delivered-To: ovs-dev@lists.linuxfoundation.org Received: from silver.osuosl.org (smtp3.osuosl.org [140.211.166.136]) by lists.linuxfoundation.org (Postfix) with ESMTP id 80C4DC0893 for ; Mon, 6 Jul 2020 08:21:09 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by silver.osuosl.org (Postfix) with ESMTP id 668A2226FF for ; Mon, 6 Jul 2020 08:21:09 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from silver.osuosl.org ([127.0.0.1]) by localhost (.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Yhm7n1uyRos8 for ; Mon, 6 Jul 2020 08:20:47 +0000 (UTC) X-Greylist: from auto-whitelisted by SQLgrey-1.7.6 Received: from www.kot-begemot.co.uk (ivanoab7.miniserver.com [37.128.132.42]) by silver.osuosl.org (Postfix) with ESMTPS id 76E2422225 for ; Mon, 6 Jul 2020 08:20:46 +0000 (UTC) Received: from tun252.jain.kot-begemot.co.uk ([192.168.18.6] helo=jain.kot-begemot.co.uk) by www.kot-begemot.co.uk with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1jsMMl-000691-M4 for dev@openvswitch.org; Mon, 06 Jul 2020 08:20:44 +0000 Received: from jain.kot-begemot.co.uk ([192.168.3.3]) by jain.kot-begemot.co.uk with esmtp (Exim 4.92) (envelope-from ) id 1jsMMg-0007Tb-Vy; Mon, 06 Jul 2020 09:20:41 +0100 From: anton.ivanov@cambridgegreys.com To: dev@openvswitch.org Date: Mon, 6 Jul 2020 09:20:13 +0100 Message-Id: <20200706082013.27446-6-anton.ivanov@cambridgegreys.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20200706082013.27446-1-anton.ivanov@cambridgegreys.com> References: <20200706082013.27446-1-anton.ivanov@cambridgegreys.com> MIME-Version: 1.0 X-Clacks-Overhead: GNU Terry Pratchett Cc: Anton Ivanov Subject: [ovs-dev] [PATCH 5/6] Introduce async IO in JSONRPC X-BeenThere: ovs-dev@openvswitch.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: ovs-dev-bounces@openvswitch.org Sender: "dev" From: Anton Ivanov 1. Pull out buffering and send/receive ops from json rpc 2. Make the SSL send zero copy (it was creating an ofpbuf out of an existing ofpbuf data without necessity). 3. Add vector IO to stream-fd to make flushing more efficient. Also makes queueing for stream-fd and stream-ssl roughly identical. 4. Unify backlog management 5. Make use of the full capacity of the incoming buffer and not only when it is empty. 6. Allow for IO to be run in worker threads 7. Various minor fixes to enable async io - make rx errors visible to tx and vice versa. Make activity tracking for reconnect async friendly, etc. 8. Enable Async IO in ovsdb Signed-off-by: Anton Ivanov --- lib/async-io.c | 521 +++++++++++++++++++++++++++++++++++++++++ lib/async-io.h | 86 +++++++ lib/automake.mk | 2 + lib/jsonrpc.c | 151 +++++------- lib/stream-fd.c | 85 +++++++ lib/stream-provider.h | 34 ++- lib/stream-ssl.c | 64 ++++- lib/stream-tcp.c | 2 + lib/stream-unix.c | 2 + lib/stream-windows.c | 2 + ovsdb/jsonrpc-server.c | 33 ++- ovsdb/ovsdb-server.c | 2 + 12 files changed, 873 insertions(+), 111 deletions(-) create mode 100644 lib/async-io.c create mode 100644 lib/async-io.h diff --git a/lib/async-io.c b/lib/async-io.c new file mode 100644 index 000000000..39b39301c --- /dev/null +++ b/lib/async-io.c @@ -0,0 +1,521 @@ +/* + * Copyright (c) 2020 Red Hat Inc + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at: + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +#include +#include "stream-provider.h" +#include +#include +#include +#include +#include +#include +#include +#include +#include "coverage.h" +#include "fatal-signal.h" +#include "flow.h" +#include "jsonrpc.h" +#include "openflow/nicira-ext.h" +#include "openflow/openflow.h" +#include "openvswitch/dynamic-string.h" +#include "openvswitch/ofp-print.h" +#include "openvswitch/ofpbuf.h" +#include "openvswitch/vlog.h" +#include "ovs-thread.h" +#include "ovs-atomic.h" +#include "packets.h" +#include "openvswitch/poll-loop.h" +#include "random.h" +#include "socket-util.h" +#include "util.h" +#include "timeval.h" +#include "async-io.h" +#include "ovs-numa.h" + +VLOG_DEFINE_THIS_MODULE(async_io); + +static bool allow_async_io = false; + +static bool async_io_setup = false; +static bool kill_async_io = false; + +static struct ovs_mutex init_mutex = OVS_MUTEX_INITIALIZER; + +static struct ovs_list io_pools = OVS_LIST_INITIALIZER(&io_pools); + +static int pool_size; + +static struct async_io_pool *io_pool = NULL; + +static int do_async_recv(struct async_data *data); +static int do_stream_flush(struct async_data *data); + +static inline bool not_in_error(struct async_data *data) { + int rx_error, tx_error; + + if (!data->valid) { + return false; + } + + atomic_read_relaxed(&data->rx_error, &rx_error); + atomic_read_relaxed(&data->tx_error, &tx_error); + + return ( + ((rx_error > 0) || (rx_error == -EAGAIN)) && + ((tx_error >= 0) || (tx_error == -EAGAIN)) + ); +} + +static inline bool in_error(struct async_data *data) { + return ! not_in_error(data); +} + + +static void *default_async_io_helper(void *arg) { + struct async_io_control *io_control = + (struct async_io_control *) arg; + struct async_data *data; + int retval; + + do { + ovs_mutex_lock(&io_control->mutex); + latch_poll(&io_control->async_latch); + LIST_FOR_EACH (data, list_node, &io_control->work_items) { + long backlog, oldbacklog; + ovs_mutex_lock(&data->mutex); + retval = -EAGAIN; + if (not_in_error(data)) { + /* + * We stop reading if the input queue is full + */ + if (byteq_headroom(&data->input) != 0) { + retval = do_async_recv(data); + } else { + poll_timer_wait(1); + retval = 0; + } + } + if (not_in_error(data) && (retval > 0 || retval == -EAGAIN)) { + stream_recv_wait(data->stream); + } + atomic_read_relaxed(&data->backlog, &oldbacklog); + if (not_in_error(data)) { + stream_run(data->stream); + do_stream_flush(data); + } + atomic_read_relaxed(&data->backlog, &backlog); + if (not_in_error(data)) { + if (backlog) { + /* upper layers will refuse to process rx + * until the tx is clear, so no point + * notifying them + */ + stream_send_wait(data->stream); + } + if (!byteq_is_empty(&data->input) || oldbacklog) { + latch_set(&data->rx_notify); + } + } + if (data->valid && in_error(data)) { + /* make sure that the other thread(s) notice any errors. + * this should not be an else because errors may have + * changed inside the ifs above. + */ + latch_set(&data->rx_notify); + data->valid = false; + } + if (not_in_error(data)) { + stream_run_wait(data->stream); + } + ovs_mutex_unlock(&data->mutex); + } + ovs_mutex_unlock(&io_control->mutex); + latch_wait(&io_control->async_latch); + poll_block(); + } while (!kill_async_io); + return arg; +} + +static void async_io_hook(void *aux OVS_UNUSED) { + int i; + static struct async_io_pool *pool; + kill_async_io = true; + LIST_FOR_EACH (pool, list_node, &io_pools) { + for (i = 0; i < pool->size ; i++) { + latch_set(&pool->controls[i].async_latch); + latch_destroy(&pool->controls[i].async_latch); + } + } +} + +static void setup_async_io(void) { + int cores, nodes; + + nodes = ovs_numa_get_n_numas(); + if (nodes == OVS_NUMA_UNSPEC || nodes <= 0) { + nodes = 1; + } + cores = ovs_numa_get_n_cores(); + if (cores == OVS_CORE_UNSPEC || cores <= 0) { + pool_size = 4; + } else { + pool_size = cores / nodes; + } + fatal_signal_add_hook(async_io_hook, NULL, NULL, true); + async_io_setup = true; +} + +struct async_io_pool *add_pool(void *(*start)(void *)){ + + struct async_io_pool *new_pool = NULL; + struct async_io_control *io_control; + int i; + + ovs_mutex_lock(&init_mutex); + + if (!async_io_setup) { + setup_async_io(); + } + + new_pool = xmalloc(sizeof(struct async_io_pool)); + new_pool->size = pool_size; /* we may make this more dynamic later */ + + ovs_list_push_back(&io_pools, &new_pool->list_node); + + new_pool->controls = + xmalloc(sizeof(struct async_io_control) * new_pool->size); + for (i = 0; i < new_pool->size; i++) { + io_control = &new_pool->controls[i]; + latch_init(&io_control->async_latch); + ovs_mutex_init(&io_control->mutex); + ovs_list_init(&io_control->work_items); + } + for (i = 0; i < pool_size; i++) { + ovs_thread_create("async io helper", start, &new_pool->controls[i]); + } + ovs_mutex_unlock(&init_mutex); + return new_pool; +} + +void +async_init_data(struct async_data *data, struct stream *stream) +{ + struct async_io_control *target_control; + unsigned int buffer_size; + + data->stream = stream; +#ifdef __linux__ + buffer_size = getpagesize(); + if (!is_pow2(buffer_size)) { + buffer_size = ASYNC_BUFFER_SIZE; + } +#else + buffer_size = ASYNC_BUFFER_SIZE; +#endif +#if (_POSIX_C_SOURCE >= 200112L || _XOPEN_SOURCE >= 600) + /* try to allocate a buffer_size as aligned, that by default is one page + * if that fails, fall back to normal memory allocation. + */ + if (posix_memalign( + (void **) &data->input_buffer, buffer_size, buffer_size)) { + data->input_buffer = xmalloc(buffer_size); + } +#else + data->input_buffer = xmalloc(buffer_size); +#endif + byteq_init(&data->input, data->input_buffer, buffer_size); + ovs_list_init(&data->output); + data->output_count = 0; + data->rx_error = ATOMIC_VAR_INIT(-EAGAIN); + data->tx_error = ATOMIC_VAR_INIT(0); + data->active = ATOMIC_VAR_INIT(false); + data->backlog = ATOMIC_VAR_INIT(0); + ovs_mutex_init(&data->mutex); + data->async_mode = allow_async_io; + data->valid = true; + if (data->async_mode) { + if (!io_pool) { + io_pool = add_pool(default_async_io_helper); + } + data->async_id = random_uint32(); + target_control = &io_pool->controls[data->async_id % io_pool->size]; + /* these are just fd pairs, no need to play with pointers, we + * can pass them around + */ + data->tx_run_notify = target_control->async_latch; + latch_init(&data->rx_notify); + ovs_mutex_lock(&target_control->mutex); + ovs_list_push_back(&target_control->work_items, &data->list_node); + ovs_mutex_unlock(&target_control->mutex); + latch_set(&target_control->async_latch); + } +} + +void +async_stream_enable(struct async_data *data) +{ + data->async_mode = allow_async_io; +} + +void +async_stream_disable(struct async_data *data) +{ + struct async_io_control *target_control; + bool needs_wake = false; + + + if (data->async_mode) { + if (not_in_error(data) && (async_get_backlog(data) > 0)) { + needs_wake = true; + latch_poll(&data->rx_notify); + latch_wait(&data->rx_notify); + latch_set(&data->tx_run_notify); + /* limit this to 50ms - should be enough for + * a single flush and we will not get stuck here + * waiting for a send to complete + */ + poll_timer_wait(50); + poll_block(); + } + if (needs_wake) { + /* we have lost all poll-wait info because we block()-ed + * locally, we need to force the upper layers to rerun so + * that they reinstate the correct waits + */ + poll_immediate_wake(); + } + target_control = &io_pool->controls[data->async_id % io_pool->size]; + ovs_mutex_lock(&target_control->mutex); + ovs_list_remove(&data->list_node); + ovs_mutex_unlock(&target_control->mutex); + data->async_mode = false; + latch_destroy(&data->rx_notify); + } + if (data->input_buffer) { + free(data->input_buffer); + data->input_buffer = NULL; + } +} + +void +async_cleanup_data(struct async_data *data) +{ + if (async_get_backlog(data)) { + ofpbuf_list_delete(&data->output); + } + atomic_store_relaxed(&data->backlog, 0); + data->output_count = 0; +} + +/* Routines intended for async IO */ + +long async_stream_enqueue(struct async_data *data, struct ofpbuf *buf) { + long retval = -EAGAIN; + long discard; + + ovs_mutex_lock(&data->mutex); + if (buf) { + ovs_list_push_back(&data->output, &buf->list_node); + data->output_count ++; + atomic_add_relaxed(&data->backlog, buf->size, &discard); + atomic_thread_fence(memory_order_release); + } + atomic_read_relaxed(&data->backlog, &retval); + ovs_mutex_unlock(&data->mutex); + return retval; +} + +static int do_stream_flush(struct async_data *data) { + struct ofpbuf *buf; + int count = 0; + bool stamp = false; + int retval = -stream_connect(data->stream); + long discard; + + if (!retval) { + while (!ovs_list_is_empty(&data->output) && count < 10) { + buf = ofpbuf_from_list(data->output.next); + if (data->stream->class->enqueue) { + ovs_list_remove(&buf->list_node); + retval = (data->stream->class->enqueue)(data->stream, buf); + if (retval > 0) { + data->output_count--; + } else { + ovs_list_push_front(&data->output, &buf->list_node); + } + } else { + retval = stream_send(data->stream, buf->data, buf->size); + if (retval > 0) { + stamp = true; + atomic_sub_relaxed(&data->backlog, retval, &discard); + ofpbuf_pull(buf, retval); + if (!buf->size) { + /* stream now owns buf */ + ovs_list_remove(&buf->list_node); + data->output_count--; + ofpbuf_delete(buf); + } + } + } + if (retval <= 0) { + break; + } + count++; + } + if (data->stream->class->flush && (retval >= 0 || retval == -EAGAIN)) { + (data->stream->class->flush)(data->stream, &retval); + if (retval > 0) { + stamp = true; + atomic_sub_relaxed(&data->backlog, retval, &discard); + } + } + if (stamp) { + atomic_store_relaxed(&data->active, true); + } + } + atomic_store_relaxed(&data->tx_error, retval); + return retval; +} + +int async_stream_flush(struct async_data *data) { + int retval; + + if (data->async_mode) { + atomic_read_relaxed(&data->tx_error, &retval); + if (retval >= 0) { + retval = -EAGAIN; /* fake a busy so that upper layers do not + * retry, we will flush the backlog in the + * background + */ + } + if (async_get_backlog(data)) { + latch_set(&data->tx_run_notify); + } + } else { + retval = do_stream_flush(data); + } + return retval; +} + +static int do_async_recv(struct async_data *data) { + size_t chunk; + int retval; + + atomic_read_relaxed(&data->rx_error, &retval); + if (retval > 0 || retval == -EAGAIN) { + chunk = byteq_headroom(&data->input); + if (chunk > 0) { + retval = stream_recv( + data->stream, byteq_head(&data->input), chunk); + if (retval > 0) { + byteq_advance_head(&data->input, retval); + } + } + } + if (retval > 0 || retval == -EAGAIN) { + retval = byteq_used(&data->input); + if (retval == 0) { + retval = -EAGAIN; + } + } + atomic_store_relaxed(&data->rx_error, retval); + return retval; +} + + +int async_stream_recv(struct async_data *data) { + int retval = -EAGAIN; + + if (data->async_mode) { + atomic_read_relaxed(&data->rx_error, &retval); + /* clear RX notifications */ + latch_poll(&data->rx_notify); + /* fake a retval from byteq usage */ + if (retval > 0 || retval == -EAGAIN) { + retval = byteq_used(&data->input); + if (retval == 0) { + retval = -EAGAIN; + } + } + } else { + retval = do_async_recv(data); + } + return retval; +} + +void async_stream_run(struct async_data *data) { + if (!data->async_mode) { + stream_run(data->stream); + } else { + latch_set(&data->tx_run_notify); + } + } + +void async_io_kick(struct async_data *data) { + if (data->async_mode) { + latch_set(&data->tx_run_notify); + } +} + +void async_recv_wait(struct async_data *data) { + if (data->async_mode) { + latch_poll(&data->rx_notify); + latch_wait(&data->rx_notify); + } else { + stream_recv_wait(data->stream); + } +} + +void async_io_enable(void) { + allow_async_io = true; +} + +/* Accessors for JSON RPC */ + +struct byteq *async_get_input(struct async_data *data) { + return &data->input; +} +struct stream *async_get_stream(struct async_data *data) { + return data->stream; +} + +bool async_output_is_empty(struct async_data *data) { + bool retval; + ovs_mutex_lock(&data->mutex); + /* backlog tracks backlog across the full stack all the + * way to the actual send. It is the source of truth + * if we have output or not so anybody asking if we + * have output should be told if we have backlog + * instead. + */ + retval = (data->backlog == 0); + ovs_mutex_unlock(&data->mutex); + return retval; +} + +long async_get_backlog(struct async_data *data) { + long retval; + /* This is used only by the unixctl connection + * so not worth it to convert backlog to atomics + */ + atomic_read_relaxed(&data->backlog, &retval); + return retval; +} + +bool async_get_active(struct async_data *data) { + bool test = true; + return atomic_compare_exchange_weak(&data->active, &test, false); +} diff --git a/lib/async-io.h b/lib/async-io.h new file mode 100644 index 000000000..dea070ee6 --- /dev/null +++ b/lib/async-io.h @@ -0,0 +1,86 @@ +/* + * Copyright (c) 2020 Red Hat, Inc + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at: + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +#ifndef ASYNC_IO_H +#define ASYNC_IO_H 1 + +#include +#include +#include +#include +#include "openvswitch/types.h" +#include "openvswitch/ofpbuf.h" +#include "socket-util.h" +#include "ovs-atomic.h" +#include "ovs-thread.h" +#include "latch.h" +#include "byteq.h" +#include "util.h" + +#define ASYNC_BUFFER_SIZE (4096) + +struct stream; + +struct async_data { + struct stream *stream; + struct ovs_list output; + struct ovs_list list_node; + long backlog; + size_t output_count; + atomic_bool active; + atomic_int rx_error, tx_error; + uint32_t async_id; + struct latch rx_notify, tx_run_notify; + struct ovs_mutex mutex; + bool async_mode, valid; + struct byteq input; + uint8_t *input_buffer; +}; + +struct async_io_control { + struct latch async_latch; + struct ovs_list work_items; + struct ovs_mutex mutex; +}; + +struct async_io_pool { + struct ovs_list list_node; + struct async_io_control *controls; + int size; +}; + +struct async_io_pool *add_pool(void *(*start)(void *)); + +long async_stream_enqueue(struct async_data *, struct ofpbuf *buf); +int async_stream_flush(struct async_data *); +int async_stream_recv(struct async_data *); +struct byteq *async_get_input(struct async_data *); +struct stream *async_get_stream(struct async_data *); +bool async_output_is_empty(struct async_data *); +long async_get_backlog(struct async_data *); +bool async_get_active(struct async_data *); + +void async_stream_enable(struct async_data *); +void async_stream_disable(struct async_data *); + +void async_init_data(struct async_data *, struct stream *); +void async_cleanup_data(struct async_data *); +void async_stream_run(struct async_data *data); +void async_io_kick(struct async_data *data); +void async_recv_wait(struct async_data *data); +void async_io_enable(void); + +#endif /* async-io.h */ diff --git a/lib/automake.mk b/lib/automake.mk index 39ff70650..d00a9a2ff 100644 --- a/lib/automake.mk +++ b/lib/automake.mk @@ -24,6 +24,8 @@ lib_libopenvswitch_la_SOURCES = \ lib/aes128.c \ lib/aes128.h \ lib/async-append.h \ + lib/async-io.h \ + lib/async-io.c \ lib/backtrace.c \ lib/backtrace.h \ lib/bfd.c \ diff --git a/lib/jsonrpc.c b/lib/jsonrpc.c index 830b9910f..0ab83a0d7 100644 --- a/lib/jsonrpc.c +++ b/lib/jsonrpc.c @@ -30,28 +30,23 @@ #include "openvswitch/poll-loop.h" #include "reconnect.h" #include "stream.h" +#include "stream-provider.h" #include "svec.h" #include "timeval.h" +#include "async-io.h" #include "openvswitch/vlog.h" VLOG_DEFINE_THIS_MODULE(jsonrpc); struct jsonrpc { - struct stream *stream; char *name; int status; - - /* Input. */ - struct byteq input; - uint8_t input_buffer[4096]; struct json_parser *parser; - - /* Output. */ - struct ovs_list output; /* Contains "struct ofpbuf"s. */ - size_t output_count; /* Number of elements in "output". */ - size_t backlog; + struct async_data data; }; +#define MIN_IDLE_TIME 10 + /* Rate limit for error messages. */ static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(5, 5); @@ -59,6 +54,11 @@ static struct jsonrpc_msg *jsonrpc_parse_received_message(struct jsonrpc *); static void jsonrpc_cleanup(struct jsonrpc *); static void jsonrpc_error(struct jsonrpc *, int error); +static inline struct async_data *adata(struct jsonrpc *rpc) { + return &rpc->data; +} + + /* This is just the same as stream_open() except that it uses the default * JSONRPC port if none is specified. */ int @@ -86,10 +86,8 @@ jsonrpc_open(struct stream *stream) rpc = xzalloc(sizeof *rpc); rpc->name = xstrdup(stream_get_name(stream)); - rpc->stream = stream; - byteq_init(&rpc->input, rpc->input_buffer, sizeof rpc->input_buffer); - ovs_list_init(&rpc->output); - + async_init_data(adata(rpc), stream); + async_stream_enable(adata(rpc)); return rpc; } @@ -109,33 +107,22 @@ jsonrpc_close(struct jsonrpc *rpc) void jsonrpc_run(struct jsonrpc *rpc) { + int retval; if (rpc->status) { return; } - stream_run(rpc->stream); - while (!ovs_list_is_empty(&rpc->output)) { - struct ofpbuf *buf = ofpbuf_from_list(rpc->output.next); - int retval; - - retval = stream_send(rpc->stream, buf->data, buf->size); - if (retval >= 0) { - rpc->backlog -= retval; - ofpbuf_pull(buf, retval); - if (!buf->size) { - ovs_list_remove(&buf->list_node); - rpc->output_count--; - ofpbuf_delete(buf); - } - } else { + async_stream_run(adata(rpc)); + do { + retval = async_stream_flush(&rpc->data); + if (retval < 0) { if (retval != -EAGAIN) { VLOG_WARN_RL(&rl, "%s: send error: %s", rpc->name, ovs_strerror(-retval)); jsonrpc_error(rpc, -retval); } - break; } - } + } while (retval > 0); } /* Arranges for the poll loop to wake up when 'rpc' needs to perform @@ -144,9 +131,13 @@ void jsonrpc_wait(struct jsonrpc *rpc) { if (!rpc->status) { - stream_run_wait(rpc->stream); - if (!ovs_list_is_empty(&rpc->output)) { - stream_send_wait(rpc->stream); + if (adata(rpc)->async_mode) { + async_recv_wait(adata(rpc)); + } else { + stream_run_wait(rpc->data.stream); + if (!async_output_is_empty(adata(rpc))) { + stream_send_wait(async_get_stream(adata(rpc))); + } } } } @@ -175,7 +166,7 @@ jsonrpc_get_status(const struct jsonrpc *rpc) size_t jsonrpc_get_backlog(const struct jsonrpc *rpc) { - return rpc->status ? 0 : rpc->backlog; + return rpc->status ? 0 : async_get_backlog(adata((struct jsonrpc *) rpc)); } /* Returns the number of bytes that have been received on 'rpc''s underlying @@ -183,7 +174,7 @@ jsonrpc_get_backlog(const struct jsonrpc *rpc) unsigned int jsonrpc_get_received_bytes(const struct jsonrpc *rpc) { - return rpc->input.head; + return async_get_input(adata((struct jsonrpc *) rpc))->head; } /* Returns 'rpc''s name, that is, the name returned by stream_get_name() for @@ -234,13 +225,13 @@ jsonrpc_log_msg(const struct jsonrpc *rpc, const char *title, * buffered in 'rpc'.) * * Always takes ownership of 'msg', regardless of success. */ + int jsonrpc_send(struct jsonrpc *rpc, struct jsonrpc_msg *msg) { struct ofpbuf *buf; struct json *json; struct ds ds = DS_EMPTY_INITIALIZER; - size_t length; if (rpc->status) { jsonrpc_msg_destroy(msg); @@ -251,24 +242,13 @@ jsonrpc_send(struct jsonrpc *rpc, struct jsonrpc_msg *msg) json = jsonrpc_msg_to_json(msg); json_to_ds(json, 0, &ds); - length = ds.length; json_destroy(json); buf = xmalloc(sizeof *buf); ofpbuf_use_ds(buf, &ds); - ovs_list_push_back(&rpc->output, &buf->list_node); - rpc->output_count++; - rpc->backlog += length; - - if (rpc->output_count >= 50) { - VLOG_INFO_RL(&rl, "excessive sending backlog, jsonrpc: %s, num of" - " msgs: %"PRIuSIZE", backlog: %"PRIuSIZE".", rpc->name, - rpc->output_count, rpc->backlog); - } + async_stream_enqueue(adata(rpc), buf); - if (rpc->backlog == length) { - jsonrpc_run(rpc); - } + jsonrpc_run(rpc); return rpc->status; } @@ -291,7 +271,7 @@ jsonrpc_send(struct jsonrpc *rpc, struct jsonrpc_msg *msg) int jsonrpc_recv(struct jsonrpc *rpc, struct jsonrpc_msg **msgp) { - int i; + int i, retval; *msgp = NULL; if (rpc->status) { @@ -302,36 +282,32 @@ jsonrpc_recv(struct jsonrpc *rpc, struct jsonrpc_msg **msgp) size_t n, used; /* Fill our input buffer if it's empty. */ - if (byteq_is_empty(&rpc->input)) { - size_t chunk; - int retval; - - chunk = byteq_headroom(&rpc->input); - retval = stream_recv(rpc->stream, byteq_head(&rpc->input), chunk); - if (retval < 0) { - if (retval == -EAGAIN) { - return EAGAIN; - } else { - VLOG_WARN_RL(&rl, "%s: receive error: %s", - rpc->name, ovs_strerror(-retval)); - jsonrpc_error(rpc, -retval); - return rpc->status; - } - } else if (retval == 0) { - jsonrpc_error(rpc, EOF); - return EOF; + retval = async_stream_recv(adata(rpc)); + if (retval < 0) { + if (retval == -EAGAIN) { + return EAGAIN; + } else { + VLOG_WARN_RL(&rl, "%s: receive error: %s", + rpc->name, ovs_strerror(-retval)); + jsonrpc_error(rpc, -retval); + return rpc->status; } - byteq_advance_head(&rpc->input, retval); + } else if (retval == 0) { + jsonrpc_error(rpc, EOF); + return EOF; } /* We have some input. Feed it into the JSON parser. */ if (!rpc->parser) { rpc->parser = json_parser_create(0); } - n = byteq_tailroom(&rpc->input); + n = byteq_tailroom(async_get_input(adata(rpc))); + if (n == 0) { + break; + } used = json_parser_feed(rpc->parser, - (char *) byteq_tail(&rpc->input), n); - byteq_advance_tail(&rpc->input, used); + (char *) byteq_tail(async_get_input(adata(rpc))), n); + byteq_advance_tail(async_get_input(adata(rpc)), used); /* If we have complete JSON, attempt to parse it as JSON-RPC. */ if (json_parser_is_done(rpc->parser)) { @@ -341,7 +317,7 @@ jsonrpc_recv(struct jsonrpc *rpc, struct jsonrpc_msg **msgp) } if (rpc->status) { - const struct byteq *q = &rpc->input; + const struct byteq *q = async_get_input(adata(rpc)); if (q->head <= q->size) { stream_report_content(q->buffer, q->head, STREAM_JSONRPC, &this_module, rpc->name); @@ -359,10 +335,10 @@ jsonrpc_recv(struct jsonrpc *rpc, struct jsonrpc_msg **msgp) void jsonrpc_recv_wait(struct jsonrpc *rpc) { - if (rpc->status || !byteq_is_empty(&rpc->input)) { + if (rpc->status || !byteq_is_empty(async_get_input(adata(rpc)))) { poll_immediate_wake_at(rpc->name); } else { - stream_recv_wait(rpc->stream); + async_recv_wait(adata(rpc)); } } @@ -385,7 +361,7 @@ jsonrpc_send_block(struct jsonrpc *rpc, struct jsonrpc_msg *msg) for (;;) { jsonrpc_run(rpc); - if (ovs_list_is_empty(&rpc->output) || rpc->status) { + if (async_output_is_empty(adata(rpc)) || rpc->status) { return rpc->status; } jsonrpc_wait(rpc); @@ -495,15 +471,14 @@ jsonrpc_error(struct jsonrpc *rpc, int error) static void jsonrpc_cleanup(struct jsonrpc *rpc) { - stream_close(rpc->stream); - rpc->stream = NULL; + async_stream_disable(adata(rpc)); + stream_close(rpc->data.stream); + rpc->data.stream = NULL; json_parser_abort(rpc->parser); rpc->parser = NULL; - ofpbuf_list_delete(&rpc->output); - rpc->backlog = 0; - rpc->output_count = 0; + async_cleanup_data(adata(rpc)); } static struct jsonrpc_msg * @@ -998,12 +973,14 @@ jsonrpc_session_run(struct jsonrpc_session *s) } if (s->rpc) { - size_t backlog; int error; + bool active = async_get_active(adata(s->rpc)); - backlog = jsonrpc_get_backlog(s->rpc); jsonrpc_run(s->rpc); - if (jsonrpc_get_backlog(s->rpc) < backlog) { + + active |= async_get_active(adata(s->rpc)); + + if (active) { /* Data previously caught in a queue was successfully sent (or * there's an error, which we'll catch below.) * @@ -1103,8 +1080,8 @@ jsonrpc_session_get_name(const struct jsonrpc_session *s) const char * jsonrpc_session_get_id(const struct jsonrpc_session *s) { - if (s->rpc && s->rpc->stream) { - return stream_get_peer_id(s->rpc->stream); + if (s->rpc && async_get_stream(adata(s->rpc))) { + return stream_get_peer_id(adata(s->rpc)->stream); } else { return NULL; } diff --git a/lib/stream-fd.c b/lib/stream-fd.c index 30622929b..6a6353002 100644 --- a/lib/stream-fd.c +++ b/lib/stream-fd.c @@ -30,6 +30,7 @@ #include "stream-provider.h" #include "stream.h" #include "openvswitch/vlog.h" +#include "openvswitch/list.h" VLOG_DEFINE_THIS_MODULE(stream_fd); @@ -40,6 +41,9 @@ struct stream_fd struct stream stream; int fd; int fd_type; + bool can_read, can_write; + struct ovs_list output; + int queue_depth; }; static const struct stream_class stream_fd_class; @@ -67,6 +71,10 @@ new_fd_stream(char *name, int fd, int connect_status, int fd_type, stream_init(&s->stream, &stream_fd_class, connect_status, name); s->fd = fd; s->fd_type = fd_type; + s->queue_depth = 0; + s->can_read = true; + s->can_write = true; + ovs_list_init(&s->output); *streamp = &s->stream; return 0; } @@ -83,6 +91,7 @@ fd_close(struct stream *stream) { struct stream_fd *s = stream_fd_cast(stream); closesocket(s->fd); + ofpbuf_list_delete(&s->output); free(s); } @@ -111,6 +120,11 @@ fd_recv(struct stream *stream, void *buffer, size_t n) if (error == WSAEWOULDBLOCK) { error = EAGAIN; } +#endif +#ifdef __linux__ + if (error == ENOBUFS) { + error = EAGAIN; + } #endif if (error != EAGAIN) { VLOG_DBG_RL(&rl, "recv: %s", sock_strerror(error)); @@ -170,6 +184,75 @@ static bool fd_set_probe_interval(struct stream *stream, int probe_interval) { +static int +fd_enqueue(struct stream *stream, struct ofpbuf *buf) +{ + struct stream_fd *sfd = stream_fd_cast(stream); + ovs_list_push_back(&sfd->output, &buf->list_node); + sfd->queue_depth ++; + return buf->size; +} + +static bool +fd_flush(struct stream *stream, int *retval) +{ + struct stream_fd *sfd = stream_fd_cast(stream); + int old_q_depth; + + if (sfd->queue_depth == 0) { + * retval = -EAGAIN; + return true; + } else { + int sent, i = 0; + struct msghdr msg; + struct ofpbuf *buf; + + msg.msg_name = NULL; + msg.msg_namelen = 0; + msg.msg_iov = xmalloc(sizeof(struct iovec) * sfd->queue_depth); + msg.msg_iovlen = sfd->queue_depth; + msg.msg_control = NULL; + msg.msg_controllen = 0; + msg.msg_flags = 0; + + LIST_FOR_EACH (buf, list_node, &sfd->output) { + msg.msg_iov[i].iov_base = buf->data; + msg.msg_iov[i].iov_len = buf->size; + i++; + } + + sent = sendmsg(sfd->fd, &msg, 0); + + free(msg.msg_iov); + + if (sent > 0) { + * retval = sent; + old_q_depth = sfd->queue_depth; + for (i = 0; i < old_q_depth ; i++) { + buf = ofpbuf_from_list(sfd->output.next); + if (buf->size > sent) { + ofpbuf_pull(buf, sent); + sent = 0; + } else { + sent -= buf->size; + sfd->queue_depth --; + ovs_list_remove(&buf->list_node); + ofpbuf_delete(buf); + } + if (sent == 0) { + break; + } + } + return true; + } else { + *retval = -sock_errno(); + return false; + } + } +} + + + static const struct stream_class stream_fd_class = { "fd", /* name */ false, /* needs_probes */ @@ -182,6 +265,8 @@ static const struct stream_class stream_fd_class = { NULL, /* run_wait */ fd_wait, /* wait */ fd_set_probe_interval, /* set_probe_interval */ + fd_enqueue, /* enqueue */ + fd_flush, /* flush */ }; /* Passive file descriptor stream. */ diff --git a/lib/stream-provider.h b/lib/stream-provider.h index 6c28cb50b..993c2f742 100644 --- a/lib/stream-provider.h +++ b/lib/stream-provider.h @@ -18,9 +18,13 @@ #define STREAM_PROVIDER_H 1 #include +#include +#include "openvswitch/list.h" +#include "openvswitch/ofpbuf.h" +#include "openvswitch/thread.h" #include "stream.h" - -/* Active stream connection. */ +#include "byteq.h" +#include "latch.h" /* Active stream connection. * @@ -130,6 +134,31 @@ struct stream_class { * */ bool (*set_probe_interval)(struct stream *stream, int probe_interval); + /* Enqueues an ofpbuf and surrenders its ownership to the + * stream + * + * - If successful - stream now owns the buffer, returns + * backlog size + * + * - On error, negative value, buffer is not claimed by + * the stream. + * + * The enqueue function must not block. If no bytes can be immediately + * accepted for transmission, it should return -EAGAIN immediately. */ + int (*enqueue)(struct stream *stream, struct ofpbuf *buf); + /* Flushes any stream buffers + * + * - If successful returns true and retval contains the backlog size + * + * - If partially successful (EAGAIN), returns false and retval is + * a positive backlog size + * + * - If unsuccessful, returns false and retval contains a negative + * error value + * + * The flush function must not block. If buffers cannot be flushed + * completely it should return "partial success" immediately. */ + bool (*flush)(struct stream *stream, int *retval); }; /* Passive listener for incoming stream connections. @@ -190,6 +219,7 @@ struct pstream_class { /* Arranges for the poll loop to wake up when a connection is ready to be * accepted on 'pstream'. */ void (*wait)(struct pstream *pstream); + }; /* Active and passive stream classes. */ diff --git a/lib/stream-ssl.c b/lib/stream-ssl.c index 575c55f5b..38a07bf6a 100644 --- a/lib/stream-ssl.c +++ b/lib/stream-ssl.c @@ -85,6 +85,8 @@ struct ssl_stream SSL *ssl; struct ofpbuf *txbuf; unsigned int session_nr; + int last_enqueued; + long backlog_to_report; /* rx_want and tx_want record the result of the last call to SSL_read() * and SSL_write(), respectively: @@ -304,6 +306,8 @@ new_ssl_stream(char *name, char *server_name, int fd, enum session_type type, sslv->rx_want = sslv->tx_want = SSL_NOTHING; sslv->session_nr = next_session_nr++; sslv->n_head = 0; + sslv->last_enqueued = 0; + sslv->backlog_to_report = 0; if (VLOG_IS_DBG_ENABLED()) { SSL_set_msg_callback(ssl, ssl_protocol_cb); @@ -784,8 +788,59 @@ ssl_run(struct stream *stream) { struct ssl_stream *sslv = ssl_stream_cast(stream); - if (sslv->txbuf && ssl_do_tx(stream) != EAGAIN) { - ssl_clear_txbuf(sslv); + if (sslv->txbuf) { + if (ssl_do_tx(stream) != EAGAIN) { + sslv->backlog_to_report += sslv->last_enqueued; + ssl_clear_txbuf(sslv); + } + } +} + +static int +ssl_enqueue(struct stream *stream, struct ofpbuf *buf) +{ + int n = buf->size; + struct ssl_stream *sslv = ssl_stream_cast(stream); + if (sslv->txbuf) { + return -EAGAIN; + } + sslv->txbuf = buf; + sslv->last_enqueued = n; + return n; +} + +static bool +ssl_flush(struct stream *stream, int *retval) +{ + struct ssl_stream *sslv = ssl_stream_cast(stream); + + if (!sslv->txbuf) { + if (sslv->backlog_to_report) { + * retval = sslv->backlog_to_report; + sslv->backlog_to_report = 0; + } else { + * retval = -EAGAIN; + } + return true; + } else { + int error; + + error = ssl_do_tx(stream); + switch (error) { + case 0: + ssl_clear_txbuf(sslv); + * retval = sslv->backlog_to_report + sslv->last_enqueued; + sslv->backlog_to_report = 0; + sslv->last_enqueued = 0; + return true; + case EAGAIN: + * retval = 0; + return false; + default: + ssl_clear_txbuf(sslv); + * retval = -error; + return false; + } } } @@ -847,8 +902,7 @@ ssl_wait(struct stream *stream, enum stream_wait_type wait) /* We have room in our tx queue. */ poll_immediate_wake(); } else { - /* stream_run_wait() will do the right thing; don't bother with - * redundancy. */ + poll_fd_wait(sslv->fd, POLLOUT); } break; @@ -869,6 +923,8 @@ const struct stream_class ssl_stream_class = { ssl_run_wait, /* run_wait */ ssl_wait, /* wait */ ssl_set_probe_interval, /* set_probe_interval */ + ssl_enqueue, /* send_buf */ + ssl_flush, }; /* Passive SSL. */ diff --git a/lib/stream-tcp.c b/lib/stream-tcp.c index 67c912105..7821c1dd1 100644 --- a/lib/stream-tcp.c +++ b/lib/stream-tcp.c @@ -74,6 +74,8 @@ const struct stream_class tcp_stream_class = { NULL, /* run_wait */ NULL, /* wait */ NULL, + NULL, /* enqueue */ + NULL, /* flush */ }; /* Passive TCP. */ diff --git a/lib/stream-unix.c b/lib/stream-unix.c index 4e96720ab..7c8987638 100644 --- a/lib/stream-unix.c +++ b/lib/stream-unix.c @@ -79,6 +79,8 @@ const struct stream_class unix_stream_class = { NULL, /* run_wait */ NULL, /* wait */ unix_set_probe_interval, + NULL, + NULL, }; /* Passive UNIX socket. */ diff --git a/lib/stream-windows.c b/lib/stream-windows.c index 836112f75..d40e55d5c 100644 --- a/lib/stream-windows.c +++ b/lib/stream-windows.c @@ -375,6 +375,8 @@ const struct stream_class windows_stream_class = { NULL, /* run_wait */ windows_wait, /* wait */ NULL, + NULL, /* enqueue */ + NULL, /* flush */ }; struct pwindows_pstream diff --git a/ovsdb/jsonrpc-server.c b/ovsdb/jsonrpc-server.c index 4e2dfc3d7..850b31b9e 100644 --- a/ovsdb/jsonrpc-server.c +++ b/ovsdb/jsonrpc-server.c @@ -540,6 +540,8 @@ ovsdb_jsonrpc_session_close(struct ovsdb_jsonrpc_session *s) static int ovsdb_jsonrpc_session_run(struct ovsdb_jsonrpc_session *s) { + struct jsonrpc_msg *msg; + jsonrpc_session_run(s->js); if (s->js_seqno != jsonrpc_session_get_seqno(s->js)) { s->js_seqno = jsonrpc_session_get_seqno(s->js); @@ -549,25 +551,20 @@ ovsdb_jsonrpc_session_run(struct ovsdb_jsonrpc_session *s) } ovsdb_jsonrpc_trigger_complete_done(s); + ovsdb_jsonrpc_monitor_flush_all(s); - if (!jsonrpc_session_get_backlog(s->js)) { - struct jsonrpc_msg *msg; - - ovsdb_jsonrpc_monitor_flush_all(s); - - msg = jsonrpc_session_recv(s->js); - if (msg) { - if (msg->type == JSONRPC_REQUEST) { - ovsdb_jsonrpc_session_got_request(s, msg); - } else if (msg->type == JSONRPC_NOTIFY) { - ovsdb_jsonrpc_session_got_notify(s, msg); - } else { - VLOG_WARN("%s: received unexpected %s message", - jsonrpc_session_get_name(s->js), - jsonrpc_msg_type_to_string(msg->type)); - jsonrpc_session_force_reconnect(s->js); - jsonrpc_msg_destroy(msg); - } + msg = jsonrpc_session_recv(s->js); + if (msg) { + if (msg->type == JSONRPC_REQUEST) { + ovsdb_jsonrpc_session_got_request(s, msg); + } else if (msg->type == JSONRPC_NOTIFY) { + ovsdb_jsonrpc_session_got_notify(s, msg); + } else { + VLOG_WARN("%s: received unexpected %s message", + jsonrpc_session_get_name(s->js), + jsonrpc_msg_type_to_string(msg->type)); + jsonrpc_session_force_reconnect(s->js); + jsonrpc_msg_destroy(msg); } } return jsonrpc_session_is_alive(s->js) ? 0 : ETIMEDOUT; diff --git a/ovsdb/ovsdb-server.c b/ovsdb/ovsdb-server.c index ef4e996df..d3953f4d9 100644 --- a/ovsdb/ovsdb-server.c +++ b/ovsdb/ovsdb-server.c @@ -59,6 +59,7 @@ #include "perf-counter.h" #include "ovsdb-util.h" #include "openvswitch/vlog.h" +#include "async-io.h" VLOG_DEFINE_THIS_MODULE(ovsdb_server); @@ -398,6 +399,7 @@ main(int argc, char *argv[]) } daemonize_complete(); + async_io_enable(); if (!run_command) { /* ovsdb-server is usually a long-running process, in which case it From patchwork Mon Jul 6 08:20:14 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Anton Ivanov X-Patchwork-Id: 1323423 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; 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Mon, 6 Jul 2020 08:20:46 +0000 (UTC) Received: from tun252.jain.kot-begemot.co.uk ([192.168.18.6] helo=jain.kot-begemot.co.uk) by www.kot-begemot.co.uk with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1jsMMm-000692-Lc for dev@openvswitch.org; Mon, 06 Jul 2020 08:20:45 +0000 Received: from jain.kot-begemot.co.uk ([192.168.3.3]) by jain.kot-begemot.co.uk with esmtp (Exim 4.92) (envelope-from ) id 1jsMMj-0007Tb-Lq; Mon, 06 Jul 2020 09:20:43 +0100 From: anton.ivanov@cambridgegreys.com To: dev@openvswitch.org Date: Mon, 6 Jul 2020 09:20:14 +0100 Message-Id: <20200706082013.27446-7-anton.ivanov@cambridgegreys.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20200706082013.27446-1-anton.ivanov@cambridgegreys.com> References: <20200706082013.27446-1-anton.ivanov@cambridgegreys.com> MIME-Version: 1.0 X-Clacks-Overhead: GNU Terry Pratchett Cc: Anton Ivanov Subject: [ovs-dev] [PATCH 6/6] Disable "merge updates on backlogged connections" test X-BeenThere: ovs-dev@openvswitch.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: ovs-dev-bounces@openvswitch.org Sender: "dev" From: Anton Ivanov The merge on backlogged behavior is predicated on prohibiting processing of incoming transactions while there is an outstanding backlog. This behavior does not make sense if the xmit/recv is async from actual business logic. Signed-off-by: Anton Ivanov --- tests/ovsdb-server.at | 190 +++++++++++++++++++++--------------------- 1 file changed, 95 insertions(+), 95 deletions(-) diff --git a/tests/ovsdb-server.at b/tests/ovsdb-server.at index 0b15758f2..e389d721a 100644 --- a/tests/ovsdb-server.at +++ b/tests/ovsdb-server.at @@ -1128,103 +1128,103 @@ AT_KEYWORDS([ovsdb server convert needs-conversion cluster]) ovsdb_check_online_conversion cluster AT_CLEANUP -AT_SETUP([ovsdb-server combines updates on backlogged connections]) -on_exit 'kill `cat *.pid`' - -# The maximum socket receive buffer size is important for this test, which -# tests behavior when the receive buffer overflows. -if test -e /proc/sys/net/core/rmem_max; then - # Linux - rmem_max=`cat /proc/sys/net/core/rmem_max` -elif rmem_max=`sysctl -n net.inet.tcp.recvbuf_max 2>/dev/null`; then - : # FreeBSD, NetBSD -else - # Don't know how to get maximum socket receive buffer on this OS - AT_SKIP_IF([:]) -fi - -# Calculate the number of iterations we need to queue. Each of the -# iterations we execute, by itself, yields a monitor update of about -# 25 kB, so fill up that much space plus a few for luck. -n_iterations=`expr $rmem_max / 25000 + 5` -echo rmem_max=$rmem_max n_iterations=$n_iterations - -# If there's too much queuing skip the test to avoid timing out. -AT_SKIP_IF([test $rmem_max -gt 1048576]) - -# Calculate the exact number of monitor updates expected for $n_iterations, -# assuming no updates are combined. The "extra" update is for the initial -# contents of the database. -n_updates=`expr $n_iterations \* 3 + 1` - -# Start an ovsdb-server with the vswitchd schema. -OVSDB_INIT([db]) -AT_CHECK([ovsdb-server --detach --no-chdir --pidfile --log-file --remote=punix:db.sock db], - [0], [ignore], [ignore]) - -# Executes a set of transactions that add a bridge with 100 ports, and -# then deletes that bridge. This yields three monitor updates that -# add up to about 25 kB in size. +#AT_SETUP([ovsdb-server combines updates on backlogged connections]) +#on_exit 'kill `cat *.pid`' # -# The update also increments a counter held in the database so that we can -# verify that the overall effect of the transactions took effect (e.g. -# monitor updates at the end weren't just dropped). We add an arbitrary -# string to the counter to make grepping for it more reliable. -counter=0 -trigger_big_update () { - counter=`expr $counter + 1` - ovs-vsctl --no-wait -- set open_vswitch . system_version=xyzzy$counter - ovs-vsctl --no-wait -- add-br br0 $add - ovs-vsctl --no-wait -- del-br br0 -} -add_ports () { - for j in `seq 1 100`; do - printf " -- add-port br0 p%d" $j - done -} -add=`add_ports` - -AT_CAPTURE_FILE([ovsdb-client.err]) -AT_CAPTURE_FILE([ovsdb-client-nonblock.err]) - - -# Start an ovsdb-client monitoring all changes to the database, -# By default, it is non-blocking, and will get update message -# for each ovsdb-server transaactions. -AT_CHECK([ovsdb-client --detach --no-chdir --pidfile=nonblock.pid monitor ALL >ovsdb-client-nonblock.out 2>ovsdb-client-nonblock.err]) - -# Start an ovsdb-client monitoring all changes to the database, -# make it block to force the buffers to fill up, and then execute -# enough iterations that ovsdb-server starts combining updates. -AT_CHECK([ovsdb-client --detach --no-chdir --pidfile monitor ALL >ovsdb-client.out 2>ovsdb-client.err]) -AT_CHECK([ovs-appctl -t ovsdb-client ovsdb-client/block]) -for i in `seq 1 $n_iterations`; do - echo "blocked update ($i of $n_iterations)" - trigger_big_update $i -done -AT_CHECK([ovs-appctl -t ovsdb-client ovsdb-client/unblock]) -OVS_WAIT_UNTIL([grep "xyzzy$counter" ovsdb-client.out]) -OVS_WAIT_UNTIL([grep "xyzzy$counter" ovsdb-client-nonblock.out]) -OVS_APP_EXIT_AND_WAIT([ovsdb-client]) -AT_CHECK([kill `cat nonblock.pid`]) - -# Count the number of updates in the ovsdb-client output, by counting -# the number of changes to the Open_vSwitch table. (All of our -# transactions modify the Open_vSwitch table.) It should be less than -# $n_updates updates. +## The maximum socket receive buffer size is important for this test, which +## tests behavior when the receive buffer overflows. +#if test -e /proc/sys/net/core/rmem_max; then +# # Linux +# rmem_max=`cat /proc/sys/net/core/rmem_max` +#elif rmem_max=`sysctl -n net.inet.tcp.recvbuf_max 2>/dev/null`; then +# : # FreeBSD, NetBSD +#else +# # Don't know how to get maximum socket receive buffer on this OS +# AT_SKIP_IF([:]) +#fi # -# Check that the counter is what we expect. -logged_updates=`grep -c '^Open_vSwitch' ovsdb-client.out` -logged_nonblock_updates=`grep -c '^Open_vSwitch' ovsdb-client-nonblock.out` -echo "logged_nonblock_updates=$logged_nonblock_updates (expected less or equal to $n_updates)" -echo "logged_updates=$logged_updates (expected less than $logged_nonblock_updates)" -AT_CHECK([test $logged_nonblock_updates -le $n_updates]) -AT_CHECK([test $logged_updates -lt $logged_nonblock_updates]) -AT_CHECK_UNQUOTED([ovs-vsctl get open_vswitch . system_version], [0], - [xyzzy$counter -]) -OVS_APP_EXIT_AND_WAIT([ovsdb-server]) -AT_CLEANUP +## Calculate the number of iterations we need to queue. Each of the +## iterations we execute, by itself, yields a monitor update of about +## 25 kB, so fill up that much space plus a few for luck. +#n_iterations=`expr $rmem_max / 25000 + 5` +#echo rmem_max=$rmem_max n_iterations=$n_iterations +# +## If there's too much queuing skip the test to avoid timing out. +#AT_SKIP_IF([test $rmem_max -gt 1048576]) +# +## Calculate the exact number of monitor updates expected for $n_iterations, +## assuming no updates are combined. The "extra" update is for the initial +## contents of the database. +#n_updates=`expr $n_iterations \* 3 + 1` +# +## Start an ovsdb-server with the vswitchd schema. +#OVSDB_INIT([db]) +#AT_CHECK([ovsdb-server --detach --no-chdir --pidfile --log-file --remote=punix:db.sock db], +# [0], [ignore], [ignore]) +# +## Executes a set of transactions that add a bridge with 100 ports, and +## then deletes that bridge. This yields three monitor updates that +## add up to about 25 kB in size. +## +## The update also increments a counter held in the database so that we can +## verify that the overall effect of the transactions took effect (e.g. +## monitor updates at the end weren't just dropped). We add an arbitrary +## string to the counter to make grepping for it more reliable. +#counter=0 +#trigger_big_update () { +# counter=`expr $counter + 1` +# ovs-vsctl --no-wait -- set open_vswitch . system_version=xyzzy$counter +# ovs-vsctl --no-wait -- add-br br0 $add +# ovs-vsctl --no-wait -- del-br br0 +#} +#add_ports () { +# for j in `seq 1 100`; do +# printf " -- add-port br0 p%d" $j +# done +#} +#add=`add_ports` +# +#AT_CAPTURE_FILE([ovsdb-client.err]) +#AT_CAPTURE_FILE([ovsdb-client-nonblock.err]) +# +# +## Start an ovsdb-client monitoring all changes to the database, +## By default, it is non-blocking, and will get update message +## for each ovsdb-server transaactions. +#AT_CHECK([ovsdb-client --detach --no-chdir --pidfile=nonblock.pid monitor ALL >ovsdb-client-nonblock.out 2>ovsdb-client-nonblock.err]) +# +## Start an ovsdb-client monitoring all changes to the database, +## make it block to force the buffers to fill up, and then execute +## enough iterations that ovsdb-server starts combining updates. +#AT_CHECK([ovsdb-client --detach --no-chdir --pidfile monitor ALL >ovsdb-client.out 2>ovsdb-client.err]) +#AT_CHECK([ovs-appctl -t ovsdb-client ovsdb-client/block]) +#for i in `seq 1 $n_iterations`; do +# echo "blocked update ($i of $n_iterations)" +# trigger_big_update $i +#done +#AT_CHECK([ovs-appctl -t ovsdb-client ovsdb-client/unblock]) +#OVS_WAIT_UNTIL([grep "xyzzy$counter" ovsdb-client.out]) +#OVS_WAIT_UNTIL([grep "xyzzy$counter" ovsdb-client-nonblock.out]) +#OVS_APP_EXIT_AND_WAIT([ovsdb-client]) +#AT_CHECK([kill `cat nonblock.pid`]) +# +## Count the number of updates in the ovsdb-client output, by counting +## the number of changes to the Open_vSwitch table. (All of our +## transactions modify the Open_vSwitch table.) It should be less than +## $n_updates updates. +## +## Check that the counter is what we expect. +#logged_updates=`grep -c '^Open_vSwitch' ovsdb-client.out` +#logged_nonblock_updates=`grep -c '^Open_vSwitch' ovsdb-client-nonblock.out` +#echo "logged_nonblock_updates=$logged_nonblock_updates (expected less or equal to $n_updates)" +#echo "logged_updates=$logged_updates (expected less than $logged_nonblock_updates)" +#AT_CHECK([test $logged_nonblock_updates -le $n_updates]) +#AT_CHECK([test $logged_updates -lt $logged_nonblock_updates]) +#AT_CHECK_UNQUOTED([ovs-vsctl get open_vswitch . system_version], [0], +# [xyzzy$counter +#]) +#OVS_APP_EXIT_AND_WAIT([ovsdb-server]) +#AT_CLEANUP AT_BANNER([OVSDB -- ovsdb-server transactions (SSL IPv4 sockets)])