diff options
Diffstat (limited to 'drivers/staging/lustre/lustre/ptlrpc/service.c')
| -rw-r--r-- | drivers/staging/lustre/lustre/ptlrpc/service.c | 2807 |
1 files changed, 0 insertions, 2807 deletions
diff --git a/drivers/staging/lustre/lustre/ptlrpc/service.c b/drivers/staging/lustre/lustre/ptlrpc/service.c deleted file mode 100644 index 3fd8c746f460..000000000000 --- a/drivers/staging/lustre/lustre/ptlrpc/service.c +++ /dev/null @@ -1,2807 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -/* - * GPL HEADER START - * - * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 only, - * as published by the Free Software Foundation. - * - * This program is distributed in the hope that it will be useful, but - * WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - * General Public License version 2 for more details (a copy is included - * in the LICENSE file that accompanied this code). - * - * You should have received a copy of the GNU General Public License - * version 2 along with this program; If not, see - * http://www.gnu.org/licenses/gpl-2.0.html - * - * GPL HEADER END - */ -/* - * Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved. - * Use is subject to license terms. - * - * Copyright (c) 2010, 2015, Intel Corporation. - */ -/* - * This file is part of Lustre, http://www.lustre.org/ - * Lustre is a trademark of Sun Microsystems, Inc. - */ - -#define DEBUG_SUBSYSTEM S_RPC - -#include <linux/kthread.h> -#include <obd_support.h> -#include <obd_class.h> -#include <lustre_net.h> -#include <lu_object.h> -#include <uapi/linux/lnet/lnet-types.h> -#include "ptlrpc_internal.h" -#include <linux/libcfs/libcfs_cpu.h> -#include <linux/libcfs/libcfs_string.h> - -/* The following are visible and mutable through /sys/module/ptlrpc */ -int test_req_buffer_pressure; -module_param(test_req_buffer_pressure, int, 0444); -MODULE_PARM_DESC(test_req_buffer_pressure, "set non-zero to put pressure on request buffer pools"); -module_param(at_min, int, 0644); -MODULE_PARM_DESC(at_min, "Adaptive timeout minimum (sec)"); -module_param(at_max, int, 0644); -MODULE_PARM_DESC(at_max, "Adaptive timeout maximum (sec)"); -module_param(at_history, int, 0644); -MODULE_PARM_DESC(at_history, - "Adaptive timeouts remember the slowest event that took place within this period (sec)"); -module_param(at_early_margin, int, 0644); -MODULE_PARM_DESC(at_early_margin, "How soon before an RPC deadline to send an early reply"); -module_param(at_extra, int, 0644); -MODULE_PARM_DESC(at_extra, "How much extra time to give with each early reply"); - -/* forward ref */ -static int ptlrpc_server_post_idle_rqbds(struct ptlrpc_service_part *svcpt); -static void ptlrpc_server_hpreq_fini(struct ptlrpc_request *req); -static void ptlrpc_at_remove_timed(struct ptlrpc_request *req); - -/** Holds a list of all PTLRPC services */ -LIST_HEAD(ptlrpc_all_services); -/** Used to protect the \e ptlrpc_all_services list */ -struct mutex ptlrpc_all_services_mutex; - -static struct ptlrpc_request_buffer_desc * -ptlrpc_alloc_rqbd(struct ptlrpc_service_part *svcpt) -{ - struct ptlrpc_service *svc = svcpt->scp_service; - struct ptlrpc_request_buffer_desc *rqbd; - - rqbd = kzalloc_node(sizeof(*rqbd), GFP_NOFS, - cfs_cpt_spread_node(svc->srv_cptable, - svcpt->scp_cpt)); - if (!rqbd) - return NULL; - - rqbd->rqbd_svcpt = svcpt; - rqbd->rqbd_refcount = 0; - rqbd->rqbd_cbid.cbid_fn = request_in_callback; - rqbd->rqbd_cbid.cbid_arg = rqbd; - INIT_LIST_HEAD(&rqbd->rqbd_reqs); - rqbd->rqbd_buffer = kvzalloc_node(svc->srv_buf_size, GFP_KERNEL, - cfs_cpt_spread_node(svc->srv_cptable, - svcpt->scp_cpt)); - - if (!rqbd->rqbd_buffer) { - kfree(rqbd); - return NULL; - } - - spin_lock(&svcpt->scp_lock); - list_add(&rqbd->rqbd_list, &svcpt->scp_rqbd_idle); - svcpt->scp_nrqbds_total++; - spin_unlock(&svcpt->scp_lock); - - return rqbd; -} - -static void -ptlrpc_free_rqbd(struct ptlrpc_request_buffer_desc *rqbd) -{ - struct ptlrpc_service_part *svcpt = rqbd->rqbd_svcpt; - - LASSERT(rqbd->rqbd_refcount == 0); - LASSERT(list_empty(&rqbd->rqbd_reqs)); - - spin_lock(&svcpt->scp_lock); - list_del(&rqbd->rqbd_list); - svcpt->scp_nrqbds_total--; - spin_unlock(&svcpt->scp_lock); - - kvfree(rqbd->rqbd_buffer); - kfree(rqbd); -} - -static int -ptlrpc_grow_req_bufs(struct ptlrpc_service_part *svcpt, int post) -{ - struct ptlrpc_service *svc = svcpt->scp_service; - struct ptlrpc_request_buffer_desc *rqbd; - int rc = 0; - int i; - - if (svcpt->scp_rqbd_allocating) - goto try_post; - - spin_lock(&svcpt->scp_lock); - /* check again with lock */ - if (svcpt->scp_rqbd_allocating) { - /* NB: we might allow more than one thread in the future */ - LASSERT(svcpt->scp_rqbd_allocating == 1); - spin_unlock(&svcpt->scp_lock); - goto try_post; - } - - svcpt->scp_rqbd_allocating++; - spin_unlock(&svcpt->scp_lock); - - for (i = 0; i < svc->srv_nbuf_per_group; i++) { - /* NB: another thread might have recycled enough rqbds, we - * need to make sure it wouldn't over-allocate, see LU-1212. - */ - if (svcpt->scp_nrqbds_posted >= svc->srv_nbuf_per_group) - break; - - rqbd = ptlrpc_alloc_rqbd(svcpt); - - if (!rqbd) { - CERROR("%s: Can't allocate request buffer\n", - svc->srv_name); - rc = -ENOMEM; - break; - } - } - - spin_lock(&svcpt->scp_lock); - - LASSERT(svcpt->scp_rqbd_allocating == 1); - svcpt->scp_rqbd_allocating--; - - spin_unlock(&svcpt->scp_lock); - - CDEBUG(D_RPCTRACE, - "%s: allocate %d new %d-byte reqbufs (%d/%d left), rc = %d\n", - svc->srv_name, i, svc->srv_buf_size, svcpt->scp_nrqbds_posted, - svcpt->scp_nrqbds_total, rc); - - try_post: - if (post && rc == 0) - rc = ptlrpc_server_post_idle_rqbds(svcpt); - - return rc; -} - -struct ptlrpc_hr_partition; - -struct ptlrpc_hr_thread { - int hrt_id; /* thread ID */ - spinlock_t hrt_lock; - wait_queue_head_t hrt_waitq; - struct list_head hrt_queue; /* RS queue */ - struct ptlrpc_hr_partition *hrt_partition; -}; - -struct ptlrpc_hr_partition { - /* # of started threads */ - atomic_t hrp_nstarted; - /* # of stopped threads */ - atomic_t hrp_nstopped; - /* cpu partition id */ - int hrp_cpt; - /* round-robin rotor for choosing thread */ - int hrp_rotor; - /* total number of threads on this partition */ - int hrp_nthrs; - /* threads table */ - struct ptlrpc_hr_thread *hrp_thrs; -}; - -#define HRT_RUNNING 0 -#define HRT_STOPPING 1 - -struct ptlrpc_hr_service { - /* CPU partition table, it's just cfs_cpt_tab for now */ - struct cfs_cpt_table *hr_cpt_table; - /** controller sleep waitq */ - wait_queue_head_t hr_waitq; - unsigned int hr_stopping; - /** roundrobin rotor for non-affinity service */ - unsigned int hr_rotor; - /* partition data */ - struct ptlrpc_hr_partition **hr_partitions; -}; - -/** reply handling service. */ -static struct ptlrpc_hr_service ptlrpc_hr; - -/** - * Choose an hr thread to dispatch requests to. - */ -static struct ptlrpc_hr_thread * -ptlrpc_hr_select(struct ptlrpc_service_part *svcpt) -{ - struct ptlrpc_hr_partition *hrp; - unsigned int rotor; - - if (svcpt->scp_cpt >= 0 && - svcpt->scp_service->srv_cptable == ptlrpc_hr.hr_cpt_table) { - /* directly match partition */ - hrp = ptlrpc_hr.hr_partitions[svcpt->scp_cpt]; - - } else { - rotor = ptlrpc_hr.hr_rotor++; - rotor %= cfs_cpt_number(ptlrpc_hr.hr_cpt_table); - - hrp = ptlrpc_hr.hr_partitions[rotor]; - } - - rotor = hrp->hrp_rotor++; - return &hrp->hrp_thrs[rotor % hrp->hrp_nthrs]; -} - -/** - * Put reply state into a queue for processing because we received - * ACK from the client - */ -void ptlrpc_dispatch_difficult_reply(struct ptlrpc_reply_state *rs) -{ - struct ptlrpc_hr_thread *hrt; - - LASSERT(list_empty(&rs->rs_list)); - - hrt = ptlrpc_hr_select(rs->rs_svcpt); - - spin_lock(&hrt->hrt_lock); - list_add_tail(&rs->rs_list, &hrt->hrt_queue); - spin_unlock(&hrt->hrt_lock); - - wake_up(&hrt->hrt_waitq); -} - -void -ptlrpc_schedule_difficult_reply(struct ptlrpc_reply_state *rs) -{ - assert_spin_locked(&rs->rs_svcpt->scp_rep_lock); - assert_spin_locked(&rs->rs_lock); - LASSERT(rs->rs_difficult); - rs->rs_scheduled_ever = 1; /* flag any notification attempt */ - - if (rs->rs_scheduled) { /* being set up or already notified */ - return; - } - - rs->rs_scheduled = 1; - list_del_init(&rs->rs_list); - ptlrpc_dispatch_difficult_reply(rs); -} -EXPORT_SYMBOL(ptlrpc_schedule_difficult_reply); - -static int -ptlrpc_server_post_idle_rqbds(struct ptlrpc_service_part *svcpt) -{ - struct ptlrpc_request_buffer_desc *rqbd; - int rc; - int posted = 0; - - for (;;) { - spin_lock(&svcpt->scp_lock); - - if (list_empty(&svcpt->scp_rqbd_idle)) { - spin_unlock(&svcpt->scp_lock); - return posted; - } - - rqbd = list_entry(svcpt->scp_rqbd_idle.next, - struct ptlrpc_request_buffer_desc, - rqbd_list); - list_del(&rqbd->rqbd_list); - - /* assume we will post successfully */ - svcpt->scp_nrqbds_posted++; - list_add(&rqbd->rqbd_list, &svcpt->scp_rqbd_posted); - - spin_unlock(&svcpt->scp_lock); - - rc = ptlrpc_register_rqbd(rqbd); - if (rc != 0) - break; - - posted = 1; - } - - spin_lock(&svcpt->scp_lock); - - svcpt->scp_nrqbds_posted--; - list_del(&rqbd->rqbd_list); - list_add_tail(&rqbd->rqbd_list, &svcpt->scp_rqbd_idle); - - /* Don't complain if no request buffers are posted right now; LNET - * won't drop requests because we set the portal lazy! - */ - - spin_unlock(&svcpt->scp_lock); - - return -1; -} - -static void ptlrpc_at_timer(struct timer_list *t) -{ - struct ptlrpc_service_part *svcpt; - - svcpt = from_timer(svcpt, t, scp_at_timer); - - svcpt->scp_at_check = 1; - svcpt->scp_at_checktime = jiffies; - wake_up(&svcpt->scp_waitq); -} - -static void -ptlrpc_server_nthreads_check(struct ptlrpc_service *svc, - struct ptlrpc_service_conf *conf) -{ - struct ptlrpc_service_thr_conf *tc = &conf->psc_thr; - unsigned int init; - unsigned int total; - unsigned int nthrs; - int weight; - - /* - * Common code for estimating & validating threads number. - * CPT affinity service could have percpt thread-pool instead - * of a global thread-pool, which means user might not always - * get the threads number they give it in conf::tc_nthrs_user - * even they did set. It's because we need to validate threads - * number for each CPT to guarantee each pool will have enough - * threads to keep the service healthy. - */ - init = PTLRPC_NTHRS_INIT + (svc->srv_ops.so_hpreq_handler != NULL); - init = max_t(int, init, tc->tc_nthrs_init); - - /* NB: please see comments in lustre_lnet.h for definition - * details of these members - */ - LASSERT(tc->tc_nthrs_max != 0); - - if (tc->tc_nthrs_user != 0) { - /* In case there is a reason to test a service with many - * threads, we give a less strict check here, it can - * be up to 8 * nthrs_max - */ - total = min(tc->tc_nthrs_max * 8, tc->tc_nthrs_user); - nthrs = total / svc->srv_ncpts; - init = max(init, nthrs); - goto out; - } - - total = tc->tc_nthrs_max; - if (tc->tc_nthrs_base == 0) { - /* don't care about base threads number per partition, - * this is most for non-affinity service - */ - nthrs = total / svc->srv_ncpts; - goto out; - } - - nthrs = tc->tc_nthrs_base; - if (svc->srv_ncpts == 1) { - int i; - - /* NB: Increase the base number if it's single partition - * and total number of cores/HTs is larger or equal to 4. - * result will always < 2 * nthrs_base - */ - weight = cfs_cpt_weight(svc->srv_cptable, CFS_CPT_ANY); - for (i = 1; (weight >> (i + 1)) != 0 && /* >= 4 cores/HTs */ - (tc->tc_nthrs_base >> i) != 0; i++) - nthrs += tc->tc_nthrs_base >> i; - } - - if (tc->tc_thr_factor != 0) { - int factor = tc->tc_thr_factor; - const int fade = 4; - - /* - * User wants to increase number of threads with for - * each CPU core/HT, most likely the factor is larger then - * one thread/core because service threads are supposed to - * be blocked by lock or wait for IO. - */ - /* - * Amdahl's law says that adding processors wouldn't give - * a linear increasing of parallelism, so it's nonsense to - * have too many threads no matter how many cores/HTs - * there are. - */ - /* weight is # of HTs */ - if (cpumask_weight(topology_sibling_cpumask(0)) > 1) { - /* depress thread factor for hyper-thread */ - factor = factor - (factor >> 1) + (factor >> 3); - } - - weight = cfs_cpt_weight(svc->srv_cptable, 0); - LASSERT(weight > 0); - - for (; factor > 0 && weight > 0; factor--, weight -= fade) - nthrs += min(weight, fade) * factor; - } - - if (nthrs * svc->srv_ncpts > tc->tc_nthrs_max) { - nthrs = max(tc->tc_nthrs_base, - tc->tc_nthrs_max / svc->srv_ncpts); - } - out: - nthrs = max(nthrs, tc->tc_nthrs_init); - svc->srv_nthrs_cpt_limit = nthrs; - svc->srv_nthrs_cpt_init = init; - - if (nthrs * svc->srv_ncpts > tc->tc_nthrs_max) { - CDEBUG(D_OTHER, "%s: This service may have more threads (%d) than the given soft limit (%d)\n", - svc->srv_name, nthrs * svc->srv_ncpts, - tc->tc_nthrs_max); - } -} - -/** - * Initialize percpt data for a service - */ -static int -ptlrpc_service_part_init(struct ptlrpc_service *svc, - struct ptlrpc_service_part *svcpt, int cpt) -{ - struct ptlrpc_at_array *array; - int size; - int index; - int rc; - - svcpt->scp_cpt = cpt; - INIT_LIST_HEAD(&svcpt->scp_threads); - - /* rqbd and incoming request queue */ - spin_lock_init(&svcpt->scp_lock); - INIT_LIST_HEAD(&svcpt->scp_rqbd_idle); - INIT_LIST_HEAD(&svcpt->scp_rqbd_posted); - INIT_LIST_HEAD(&svcpt->scp_req_incoming); - init_waitqueue_head(&svcpt->scp_waitq); - /* history request & rqbd list */ - INIT_LIST_HEAD(&svcpt->scp_hist_reqs); - INIT_LIST_HEAD(&svcpt->scp_hist_rqbds); - - /* active requests and hp requests */ - spin_lock_init(&svcpt->scp_req_lock); - - /* reply states */ - spin_lock_init(&svcpt->scp_rep_lock); - INIT_LIST_HEAD(&svcpt->scp_rep_active); - INIT_LIST_HEAD(&svcpt->scp_rep_idle); - init_waitqueue_head(&svcpt->scp_rep_waitq); - atomic_set(&svcpt->scp_nreps_difficult, 0); - - /* adaptive timeout */ - spin_lock_init(&svcpt->scp_at_lock); - array = &svcpt->scp_at_array; - - size = at_est2timeout(at_max); - array->paa_size = size; - array->paa_count = 0; - array->paa_deadline = -1; - - /* allocate memory for scp_at_array (ptlrpc_at_array) */ - array->paa_reqs_array = - kzalloc_node(sizeof(struct list_head) * size, GFP_NOFS, - cfs_cpt_spread_node(svc->srv_cptable, cpt)); - if (!array->paa_reqs_array) - return -ENOMEM; - - for (index = 0; index < size; index++) - INIT_LIST_HEAD(&array->paa_reqs_array[index]); - - array->paa_reqs_count = - kzalloc_node(sizeof(__u32) * size, GFP_NOFS, - cfs_cpt_spread_node(svc->srv_cptable, cpt)); - if (!array->paa_reqs_count) - goto free_reqs_array; - - timer_setup(&svcpt->scp_at_timer, ptlrpc_at_timer, 0); - - /* At SOW, service time should be quick; 10s seems generous. If client - * timeout is less than this, we'll be sending an early reply. - */ - at_init(&svcpt->scp_at_estimate, 10, 0); - - /* assign this before call ptlrpc_grow_req_bufs */ - svcpt->scp_service = svc; - /* Now allocate the request buffers, but don't post them now */ - rc = ptlrpc_grow_req_bufs(svcpt, 0); - /* We shouldn't be under memory pressure at startup, so - * fail if we can't allocate all our buffers at this time. - */ - if (rc != 0) - goto free_reqs_count; - - return 0; - -free_reqs_count: - kfree(array->paa_reqs_count); - array->paa_reqs_count = NULL; -free_reqs_array: - kfree(array->paa_reqs_array); - array->paa_reqs_array = NULL; - - return -ENOMEM; -} - -/** - * Initialize service on a given portal. - * This includes starting serving threads , allocating and posting rqbds and - * so on. - */ -struct ptlrpc_service * -ptlrpc_register_service(struct ptlrpc_service_conf *conf, - struct kset *parent, - struct dentry *debugfs_entry) -{ - struct ptlrpc_service_cpt_conf *cconf = &conf->psc_cpt; - struct ptlrpc_service *service; - struct ptlrpc_service_part *svcpt; - struct cfs_cpt_table *cptable; - __u32 *cpts = NULL; - int ncpts; - int cpt; - int rc; - int i; - - LASSERT(conf->psc_buf.bc_nbufs > 0); - LASSERT(conf->psc_buf.bc_buf_size >= - conf->psc_buf.bc_req_max_size + SPTLRPC_MAX_PAYLOAD); - LASSERT(conf->psc_thr.tc_ctx_tags != 0); - - cptable = cconf->cc_cptable; - if (!cptable) - cptable = cfs_cpt_tab; - - if (!conf->psc_thr.tc_cpu_affinity) { - ncpts = 1; - } else { - ncpts = cfs_cpt_number(cptable); - if (cconf->cc_pattern) { - struct cfs_expr_list *el; - - rc = cfs_expr_list_parse(cconf->cc_pattern, - strlen(cconf->cc_pattern), - 0, ncpts - 1, &el); - if (rc != 0) { - CERROR("%s: invalid CPT pattern string: %s", - conf->psc_name, cconf->cc_pattern); - return ERR_PTR(-EINVAL); - } - - rc = cfs_expr_list_values(el, ncpts, &cpts); - cfs_expr_list_free(el); - if (rc <= 0) { - CERROR("%s: failed to parse CPT array %s: %d\n", - conf->psc_name, cconf->cc_pattern, rc); - kfree(cpts); - return ERR_PTR(rc < 0 ? rc : -EINVAL); - } - ncpts = rc; - } - } - - service = kzalloc(offsetof(struct ptlrpc_service, srv_parts[ncpts]), - GFP_NOFS); - if (!service) { - kfree(cpts); - return ERR_PTR(-ENOMEM); - } - - service->srv_cptable = cptable; - service->srv_cpts = cpts; - service->srv_ncpts = ncpts; - - service->srv_cpt_bits = 0; /* it's zero already, easy to read... */ - while ((1 << service->srv_cpt_bits) < cfs_cpt_number(cptable)) - service->srv_cpt_bits++; - - /* public members */ - spin_lock_init(&service->srv_lock); - service->srv_name = conf->psc_name; - service->srv_watchdog_factor = conf->psc_watchdog_factor; - INIT_LIST_HEAD(&service->srv_list); /* for safety of cleanup */ - - /* buffer configuration */ - service->srv_nbuf_per_group = test_req_buffer_pressure ? - 1 : conf->psc_buf.bc_nbufs; - service->srv_max_req_size = conf->psc_buf.bc_req_max_size + - SPTLRPC_MAX_PAYLOAD; - service->srv_buf_size = conf->psc_buf.bc_buf_size; - service->srv_rep_portal = conf->psc_buf.bc_rep_portal; - service->srv_req_portal = conf->psc_buf.bc_req_portal; - - /* Increase max reply size to next power of two */ - service->srv_max_reply_size = 1; - while (service->srv_max_reply_size < - conf->psc_buf.bc_rep_max_size + SPTLRPC_MAX_PAYLOAD) - service->srv_max_reply_size <<= 1; - - service->srv_thread_name = conf->psc_thr.tc_thr_name; - service->srv_ctx_tags = conf->psc_thr.tc_ctx_tags; - service->srv_hpreq_ratio = PTLRPC_SVC_HP_RATIO; - service->srv_ops = conf->psc_ops; - - for (i = 0; i < ncpts; i++) { - if (!conf->psc_thr.tc_cpu_affinity) - cpt = CFS_CPT_ANY; - else - cpt = cpts ? cpts[i] : i; - - svcpt = kzalloc_node(sizeof(*svcpt), GFP_NOFS, - cfs_cpt_spread_node(cptable, cpt)); - if (!svcpt) { - rc = -ENOMEM; - goto failed; - } - - service->srv_parts[i] = svcpt; - rc = ptlrpc_service_part_init(service, svcpt, cpt); - if (rc != 0) - goto failed; - } - - ptlrpc_server_nthreads_check(service, conf); - - rc = LNetSetLazyPortal(service->srv_req_portal); - LASSERT(rc == 0); - - mutex_lock(&ptlrpc_all_services_mutex); - list_add(&service->srv_list, &ptlrpc_all_services); - mutex_unlock(&ptlrpc_all_services_mutex); - - if (parent) { - rc = ptlrpc_sysfs_register_service(parent, service); - if (rc) - goto failed; - } - - if (!IS_ERR_OR_NULL(debugfs_entry)) - ptlrpc_ldebugfs_register_service(debugfs_entry, service); - - rc = ptlrpc_service_nrs_setup(service); - if (rc != 0) - goto failed; - - CDEBUG(D_NET, "%s: Started, listening on portal %d\n", - service->srv_name, service->srv_req_portal); - - rc = ptlrpc_start_threads(service); - if (rc != 0) { - CERROR("Failed to start threads for service %s: %d\n", - service->srv_name, rc); - goto failed; - } - - return service; -failed: - ptlrpc_unregister_service(service); - return ERR_PTR(rc); -} -EXPORT_SYMBOL(ptlrpc_register_service); - -/** - * to actually free the request, must be called without holding svc_lock. - * note it's caller's responsibility to unlink req->rq_list. - */ -static void ptlrpc_server_free_request(struct ptlrpc_request *req) -{ - LASSERT(atomic_read(&req->rq_refcount) == 0); - LASSERT(list_empty(&req->rq_timed_list)); - - /* DEBUG_REQ() assumes the reply state of a request with a valid - * ref will not be destroyed until that reference is dropped. - */ - ptlrpc_req_drop_rs(req); - - sptlrpc_svc_ctx_decref(req); - - if (req != &req->rq_rqbd->rqbd_req) { - /* NB request buffers use an embedded - * req if the incoming req unlinked the - * MD; this isn't one of them! - */ - ptlrpc_request_cache_free(req); - } -} - -/** - * drop a reference count of the request. if it reaches 0, we either - * put it into history list, or free it immediately. - */ -static void ptlrpc_server_drop_request(struct ptlrpc_request *req) -{ - struct ptlrpc_request_buffer_desc *rqbd = req->rq_rqbd; - struct ptlrpc_service_part *svcpt = rqbd->rqbd_svcpt; - struct ptlrpc_service *svc = svcpt->scp_service; - int refcount; - - if (!atomic_dec_and_test(&req->rq_refcount)) - return; - - if (req->rq_at_linked) { - spin_lock(&svcpt->scp_at_lock); - /* recheck with lock, in case it's unlinked by - * ptlrpc_at_check_timed() - */ - if (likely(req->rq_at_linked)) - ptlrpc_at_remove_timed(req); - spin_unlock(&svcpt->scp_at_lock); - } - - LASSERT(list_empty(&req->rq_timed_list)); - - /* finalize request */ - if (req->rq_export) { - class_export_put(req->rq_export); - req->rq_export = NULL; - } - - spin_lock(&svcpt->scp_lock); - - list_add(&req->rq_list, &rqbd->rqbd_reqs); - - refcount = --(rqbd->rqbd_refcount); - if (refcount == 0) { - /* request buffer is now idle: add to history */ - list_del(&rqbd->rqbd_list); - - list_add_tail(&rqbd->rqbd_list, &svcpt->scp_hist_rqbds); - svcpt->scp_hist_nrqbds++; - - /* cull some history? - * I expect only about 1 or 2 rqbds need to be recycled here - */ - while (svcpt->scp_hist_nrqbds > svc->srv_hist_nrqbds_cpt_max) { - rqbd = list_entry(svcpt->scp_hist_rqbds.next, - struct ptlrpc_request_buffer_desc, - rqbd_list); - - list_del(&rqbd->rqbd_list); - svcpt->scp_hist_nrqbds--; - - /* remove rqbd's reqs from svc's req history while - * I've got the service lock - */ - list_for_each_entry(req, &rqbd->rqbd_reqs, rq_list) { - /* Track the highest culled req seq */ - if (req->rq_history_seq > - svcpt->scp_hist_seq_culled) { - svcpt->scp_hist_seq_culled = - req->rq_history_seq; - } - list_del(&req->rq_history_list); - } - - spin_unlock(&svcpt->scp_lock); - - while ((req = list_first_entry_or_null( - &rqbd->rqbd_reqs, - struct ptlrpc_request, rq_list))) { - list_del(&req->rq_list); - ptlrpc_server_free_request(req); - } - - spin_lock(&svcpt->scp_lock); - /* - * now all reqs including the embedded req has been - * disposed, schedule request buffer for re-use. - */ - LASSERT(atomic_read(&rqbd->rqbd_req.rq_refcount) == - 0); - list_add_tail(&rqbd->rqbd_list, &svcpt->scp_rqbd_idle); - } - - spin_unlock(&svcpt->scp_lock); - } else if (req->rq_reply_state && req->rq_reply_state->rs_prealloc) { - /* If we are low on memory, we are not interested in history */ - list_del(&req->rq_list); - list_del_init(&req->rq_history_list); - - /* Track the highest culled req seq */ - if (req->rq_history_seq > svcpt->scp_hist_seq_culled) - svcpt->scp_hist_seq_culled = req->rq_history_seq; - - spin_unlock(&svcpt->scp_lock); - - ptlrpc_server_free_request(req); - } else { - spin_unlock(&svcpt->scp_lock); - } -} - -/** - * to finish a request: stop sending more early replies, and release - * the request. - */ -static void ptlrpc_server_finish_request(struct ptlrpc_service_part *svcpt, - struct ptlrpc_request *req) -{ - ptlrpc_server_hpreq_fini(req); - - if (req->rq_session.lc_thread) { - lu_context_exit(&req->rq_session); - lu_context_fini(&req->rq_session); - } - - ptlrpc_server_drop_request(req); -} - -/** - * to finish a active request: stop sending more early replies, and release - * the request. should be called after we finished handling the request. - */ -static void ptlrpc_server_finish_active_request( - struct ptlrpc_service_part *svcpt, - struct ptlrpc_request *req) -{ - spin_lock(&svcpt->scp_req_lock); - ptlrpc_nrs_req_stop_nolock(req); - svcpt->scp_nreqs_active--; - if (req->rq_hp) - svcpt->scp_nhreqs_active--; - spin_unlock(&svcpt->scp_req_lock); - - ptlrpc_nrs_req_finalize(req); - - if (req->rq_export) - class_export_rpc_dec(req->rq_export); - - ptlrpc_server_finish_request(svcpt, req); -} - -/** - * Sanity check request \a req. - * Return 0 if all is ok, error code otherwise. - */ -static int ptlrpc_check_req(struct ptlrpc_request *req) -{ - struct obd_device *obd = req->rq_export->exp_obd; - int rc = 0; - - if (unlikely(lustre_msg_get_conn_cnt(req->rq_reqmsg) < - req->rq_export->exp_conn_cnt)) { - DEBUG_REQ(D_RPCTRACE, req, - "DROPPING req from old connection %d < %d", - lustre_msg_get_conn_cnt(req->rq_reqmsg), - req->rq_export->exp_conn_cnt); - return -EEXIST; - } - if (unlikely(!obd || obd->obd_fail)) { - /* - * Failing over, don't handle any more reqs, send - * error response instead. - */ - CDEBUG(D_RPCTRACE, "Dropping req %p for failed obd %s\n", - req, obd ? obd->obd_name : "unknown"); - rc = -ENODEV; - } else if (lustre_msg_get_flags(req->rq_reqmsg) & - (MSG_REPLAY | MSG_REQ_REPLAY_DONE)) { - DEBUG_REQ(D_ERROR, req, "Invalid replay without recovery"); - class_fail_export(req->rq_export); - rc = -ENODEV; - } else if (lustre_msg_get_transno(req->rq_reqmsg) != 0) { - DEBUG_REQ(D_ERROR, req, - "Invalid req with transno %llu without recovery", - lustre_msg_get_transno(req->rq_reqmsg)); - class_fail_export(req->rq_export); - rc = -ENODEV; - } - - if (unlikely(rc < 0)) { - req->rq_status = rc; - ptlrpc_error(req); - } - return rc; -} - -static void ptlrpc_at_set_timer(struct ptlrpc_service_part *svcpt) -{ - struct ptlrpc_at_array *array = &svcpt->scp_at_array; - __s32 next; - - if (array->paa_count == 0) { - del_timer(&svcpt->scp_at_timer); - return; - } - - /* Set timer for closest deadline */ - next = (__s32)(array->paa_deadline - ktime_get_real_seconds() - - at_early_margin); - if (next <= 0) { - ptlrpc_at_timer(&svcpt->scp_at_timer); - } else { - mod_timer(&svcpt->scp_at_timer, jiffies + next * HZ); - CDEBUG(D_INFO, "armed %s at %+ds\n", - svcpt->scp_service->srv_name, next); - } -} - -/* Add rpc to early reply check list */ -static int ptlrpc_at_add_timed(struct ptlrpc_request *req) -{ - struct ptlrpc_service_part *svcpt = req->rq_rqbd->rqbd_svcpt; - struct ptlrpc_at_array *array = &svcpt->scp_at_array; - struct ptlrpc_request *rq = NULL; - __u32 index; - - if (AT_OFF) - return 0; - - if (req->rq_no_reply) - return 0; - - if ((lustre_msghdr_get_flags(req->rq_reqmsg) & MSGHDR_AT_SUPPORT) == 0) - return -ENOSYS; - - spin_lock(&svcpt->scp_at_lock); - LASSERT(list_empty(&req->rq_timed_list)); - - div_u64_rem(req->rq_deadline, array->paa_size, &index); - if (array->paa_reqs_count[index] > 0) { - /* latest rpcs will have the latest deadlines in the list, - * so search backward. - */ - list_for_each_entry_reverse(rq, &array->paa_reqs_array[index], - rq_timed_list) { - if (req->rq_deadline >= rq->rq_deadline) { - list_add(&req->rq_timed_list, - &rq->rq_timed_list); - break; - } - } - } - - /* Add the request at the head of the list */ - if (list_empty(&req->rq_timed_list)) - list_add(&req->rq_timed_list, &array->paa_reqs_array[index]); - - spin_lock(&req->rq_lock); - req->rq_at_linked = 1; - spin_unlock(&req->rq_lock); - req->rq_at_index = index; - array->paa_reqs_count[index]++; - array->paa_count++; - if (array->paa_count == 1 || array->paa_deadline > req->rq_deadline) { - array->paa_deadline = req->rq_deadline; - ptlrpc_at_set_timer(svcpt); - } - spin_unlock(&svcpt->scp_at_lock); - - return 0; -} - -static void -ptlrpc_at_remove_timed(struct ptlrpc_request *req) -{ - struct ptlrpc_at_array *array; - - array = &req->rq_rqbd->rqbd_svcpt->scp_at_array; - - /* NB: must call with hold svcpt::scp_at_lock */ - LASSERT(!list_empty(&req->rq_timed_list)); - list_del_init(&req->rq_timed_list); - - spin_lock(&req->rq_lock); - req->rq_at_linked = 0; - spin_unlock(&req->rq_lock); - - array->paa_reqs_count[req->rq_at_index]--; - array->paa_count--; -} - -/* - * Attempt to extend the request deadline by sending an early reply to the - * client. - */ -static int ptlrpc_at_send_early_reply(struct ptlrpc_request *req) -{ - struct ptlrpc_service_part *svcpt = req->rq_rqbd->rqbd_svcpt; - struct ptlrpc_request *reqcopy; - struct lustre_msg *reqmsg; - long olddl = req->rq_deadline - ktime_get_real_seconds(); - time64_t newdl; - int rc; - - /* deadline is when the client expects us to reply, margin is the - * difference between clients' and servers' expectations - */ - DEBUG_REQ(D_ADAPTTO, req, - "%ssending early reply (deadline %+lds, margin %+lds) for %d+%d", - AT_OFF ? "AT off - not " : "", - olddl, olddl - at_get(&svcpt->scp_at_estimate), - at_get(&svcpt->scp_at_estimate), at_extra); - - if (AT_OFF) - return 0; - - if (olddl < 0) { - DEBUG_REQ(D_WARNING, req, "Already past deadline (%+lds), not sending early reply. Consider increasing at_early_margin (%d)?", - olddl, at_early_margin); - - /* Return an error so we're not re-added to the timed list. */ - return -ETIMEDOUT; - } - - if (!(lustre_msghdr_get_flags(req->rq_reqmsg) & MSGHDR_AT_SUPPORT)) { - DEBUG_REQ(D_INFO, req, "Wanted to ask client for more time, but no AT support"); - return -ENOSYS; - } - - /* - * We want to extend the request deadline by at_extra seconds, - * so we set our service estimate to reflect how much time has - * passed since this request arrived plus an additional - * at_extra seconds. The client will calculate the new deadline - * based on this service estimate (plus some additional time to - * account for network latency). See ptlrpc_at_recv_early_reply - */ - at_measured(&svcpt->scp_at_estimate, at_extra + - ktime_get_real_seconds() - req->rq_arrival_time.tv_sec); - newdl = req->rq_arrival_time.tv_sec + at_get(&svcpt->scp_at_estimate); - - /* Check to see if we've actually increased the deadline - - * we may be past adaptive_max - */ - if (req->rq_deadline >= newdl) { - DEBUG_REQ(D_WARNING, req, "Couldn't add any time (%ld/%lld), not sending early reply\n", - olddl, newdl - ktime_get_real_seconds()); - return -ETIMEDOUT; - } - - reqcopy = ptlrpc_request_cache_alloc(GFP_NOFS); - if (!reqcopy) - return -ENOMEM; - reqmsg = kvzalloc(req->rq_reqlen, GFP_NOFS); - if (!reqmsg) { - rc = -ENOMEM; - goto out_free; - } - - *reqcopy = *req; - reqcopy->rq_reply_state = NULL; - reqcopy->rq_rep_swab_mask = 0; - reqcopy->rq_pack_bulk = 0; - reqcopy->rq_pack_udesc = 0; - reqcopy->rq_packed_final = 0; - sptlrpc_svc_ctx_addref(reqcopy); - /* We only need the reqmsg for the magic */ - reqcopy->rq_reqmsg = reqmsg; - memcpy(reqmsg, req->rq_reqmsg, req->rq_reqlen); - - LASSERT(atomic_read(&req->rq_refcount)); - /** if it is last refcount then early reply isn't needed */ - if (atomic_read(&req->rq_refcount) == 1) { - DEBUG_REQ(D_ADAPTTO, reqcopy, "Normal reply already sent out, abort sending early reply\n"); - rc = -EINVAL; - goto out; - } - - /* Connection ref */ - reqcopy->rq_export = class_conn2export( - lustre_msg_get_handle(reqcopy->rq_reqmsg)); - if (!reqcopy->rq_export) { - rc = -ENODEV; - goto out; - } - - /* RPC ref */ - class_export_rpc_inc(reqcopy->rq_export); - if (reqcopy->rq_export->exp_obd && - reqcopy->rq_export->exp_obd->obd_fail) { - rc = -ENODEV; - goto out_put; - } - - rc = lustre_pack_reply_flags(reqcopy, 1, NULL, NULL, LPRFL_EARLY_REPLY); - if (rc) - goto out_put; - - rc = ptlrpc_send_reply(reqcopy, PTLRPC_REPLY_EARLY); - - if (!rc) { - /* Adjust our own deadline to what we told the client */ - req->rq_deadline = newdl; - req->rq_early_count++; /* number sent, server side */ - } else { - DEBUG_REQ(D_ERROR, req, "Early reply send failed %d", rc); - } - - /* Free the (early) reply state from lustre_pack_reply. - * (ptlrpc_send_reply takes it's own rs ref, so this is safe here) - */ - ptlrpc_req_drop_rs(reqcopy); - -out_put: - class_export_rpc_dec(reqcopy->rq_export); - class_export_put(reqcopy->rq_export); -out: - sptlrpc_svc_ctx_decref(reqcopy); - kvfree(reqmsg); -out_free: - ptlrpc_request_cache_free(reqcopy); - return rc; -} - -/* Send early replies to everybody expiring within at_early_margin - * asking for at_extra time - */ -static void ptlrpc_at_check_timed(struct ptlrpc_service_part *svcpt) -{ - struct ptlrpc_at_array *array = &svcpt->scp_at_array; - struct ptlrpc_request *rq, *n; - struct list_head work_list; - __u32 index, count; - time64_t deadline; - time64_t now = ktime_get_real_seconds(); - long delay; - int first, counter = 0; - - spin_lock(&svcpt->scp_at_lock); - if (svcpt->scp_at_check == 0) { - spin_unlock(&svcpt->scp_at_lock); - return; - } - delay = jiffies - svcpt->scp_at_checktime; - svcpt->scp_at_check = 0; - - if (array->paa_count == 0) { - spin_unlock(&svcpt->scp_at_lock); - return; - } - - /* The timer went off, but maybe the nearest rpc already completed. */ - first = array->paa_deadline - now; - if (first > at_early_margin) { - /* We've still got plenty of time. Reset the timer. */ - ptlrpc_at_set_timer(svcpt); - spin_unlock(&svcpt->scp_at_lock); - return; - } - - /* We're close to a timeout, and we don't know how much longer the - * server will take. Send early replies to everyone expiring soon. - */ - INIT_LIST_HEAD(&work_list); - deadline = -1; - div_u64_rem(array->paa_deadline, array->paa_size, &index); - count = array->paa_count; - while (count > 0) { - count -= array->paa_reqs_count[index]; - list_for_each_entry_safe(rq, n, &array->paa_reqs_array[index], - rq_timed_list) { - if (rq->rq_deadline > now + at_early_margin) { - /* update the earliest deadline */ - if (deadline == -1 || - rq->rq_deadline < deadline) - deadline = rq->rq_deadline; - break; - } - - ptlrpc_at_remove_timed(rq); - /** - * ptlrpc_server_drop_request() may drop - * refcount to 0 already. Let's check this and - * don't add entry to work_list - */ - if (likely(atomic_inc_not_zero(&rq->rq_refcount))) - list_add(&rq->rq_timed_list, &work_list); - counter++; - } - - if (++index >= array->paa_size) - index = 0; - } - array->paa_deadline = deadline; - /* we have a new earliest deadline, restart the timer */ - ptlrpc_at_set_timer(svcpt); - - spin_unlock(&svcpt->scp_at_lock); - - CDEBUG(D_ADAPTTO, "timeout in %+ds, asking for %d secs on %d early replies\n", - first, at_extra, counter); - if (first < 0) { - /* We're already past request deadlines before we even get a - * chance to send early replies - */ - LCONSOLE_WARN("%s: This server is not able to keep up with request traffic (cpu-bound).\n", - svcpt->scp_service->srv_name); - CWARN("earlyQ=%d reqQ=%d recA=%d, svcEst=%d, delay=%ld(jiff)\n", - counter, svcpt->scp_nreqs_incoming, - svcpt->scp_nreqs_active, - at_get(&svcpt->scp_at_estimate), delay); - } - - /* we took additional refcount so entries can't be deleted from list, no - * locking is needed - */ - while (!list_empty(&work_list)) { - rq = list_entry(work_list.next, struct ptlrpc_request, - rq_timed_list); - list_del_init(&rq->rq_timed_list); - - if (ptlrpc_at_send_early_reply(rq) == 0) - ptlrpc_at_add_timed(rq); - - ptlrpc_server_drop_request(rq); - } -} - -/** - * Put the request to the export list if the request may become - * a high priority one. - */ -static int ptlrpc_server_hpreq_init(struct ptlrpc_service_part *svcpt, - struct ptlrpc_request *req) -{ - int rc = 0; - - if (svcpt->scp_service->srv_ops.so_hpreq_handler) { - rc = svcpt->scp_service->srv_ops.so_hpreq_handler(req); - if (rc < 0) - return rc; - LASSERT(rc == 0); - } - if (req->rq_export && req->rq_ops) { - /* Perform request specific check. We should do this check - * before the request is added into exp_hp_rpcs list otherwise - * it may hit swab race at LU-1044. - */ - if (req->rq_ops->hpreq_check) { - rc = req->rq_ops->hpreq_check(req); - if (rc == -ESTALE) { - req->rq_status = rc; - ptlrpc_error(req); - } - /** can only return error, - * 0 for normal request, - * or 1 for high priority request - */ - LASSERT(rc <= 1); - } - - spin_lock_bh(&req->rq_export->exp_rpc_lock); - list_add(&req->rq_exp_list, &req->rq_export->exp_hp_rpcs); - spin_unlock_bh(&req->rq_export->exp_rpc_lock); - } - - ptlrpc_nrs_req_initialize(svcpt, req, rc); - - return rc; -} - -/** Remove the request from the export list. */ -static void ptlrpc_server_hpreq_fini(struct ptlrpc_request *req) -{ - if (req->rq_export && req->rq_ops) { - /* refresh lock timeout again so that client has more - * room to send lock cancel RPC. - */ - if (req->rq_ops->hpreq_fini) - req->rq_ops->hpreq_fini(req); - - spin_lock_bh(&req->rq_export->exp_rpc_lock); - list_del_init(&req->rq_exp_list); - spin_unlock_bh(&req->rq_export->exp_rpc_lock); - } -} - -static int ptlrpc_server_request_add(struct ptlrpc_service_part *svcpt, - struct ptlrpc_request *req) -{ - int rc; - - rc = ptlrpc_server_hpreq_init(svcpt, req); - if (rc < 0) - return rc; - - ptlrpc_nrs_req_add(svcpt, req, !!rc); - - return 0; -} - -/** - * Allow to handle high priority request - * User can call it w/o any lock but need to hold - * ptlrpc_service_part::scp_req_lock to get reliable result - */ -static bool ptlrpc_server_allow_high(struct ptlrpc_service_part *svcpt, - bool force) -{ - int running = svcpt->scp_nthrs_running; - - if (!nrs_svcpt_has_hp(svcpt)) - return false; - - if (force) - return true; - - if (unlikely(svcpt->scp_service->srv_req_portal == MDS_REQUEST_PORTAL && - CFS_FAIL_PRECHECK(OBD_FAIL_PTLRPC_CANCEL_RESEND))) { - /* leave just 1 thread for normal RPCs */ - running = PTLRPC_NTHRS_INIT; - if (svcpt->scp_service->srv_ops.so_hpreq_handler) - running += 1; - } - - if (svcpt->scp_nreqs_active >= running - 1) - return false; - - if (svcpt->scp_nhreqs_active == 0) - return true; - - return !ptlrpc_nrs_req_pending_nolock(svcpt, false) || - svcpt->scp_hreq_count < svcpt->scp_service->srv_hpreq_ratio; -} - -static bool ptlrpc_server_high_pending(struct ptlrpc_service_part *svcpt, - bool force) -{ - return ptlrpc_server_allow_high(svcpt, force) && - ptlrpc_nrs_req_pending_nolock(svcpt, true); -} - -/** - * Only allow normal priority requests on a service that has a high-priority - * queue if forced (i.e. cleanup), if there are other high priority requests - * already being processed (i.e. those threads can service more high-priority - * requests), or if there are enough idle threads that a later thread can do - * a high priority request. - * User can call it w/o any lock but need to hold - * ptlrpc_service_part::scp_req_lock to get reliable result - */ -static bool ptlrpc_server_allow_normal(struct ptlrpc_service_part *svcpt, - bool force) -{ - int running = svcpt->scp_nthrs_running; - - if (unlikely(svcpt->scp_service->srv_req_portal == MDS_REQUEST_PORTAL && - CFS_FAIL_PRECHECK(OBD_FAIL_PTLRPC_CANCEL_RESEND))) { - /* leave just 1 thread for normal RPCs */ - running = PTLRPC_NTHRS_INIT; - if (svcpt->scp_service->srv_ops.so_hpreq_handler) - running += 1; - } - - if (force || - svcpt->scp_nreqs_active < running - 2) - return true; - - if (svcpt->scp_nreqs_active >= running - 1) - return false; - - return svcpt->scp_nhreqs_active > 0 || !nrs_svcpt_has_hp(svcpt); -} - -static bool ptlrpc_server_normal_pending(struct ptlrpc_service_part *svcpt, - bool force) -{ - return ptlrpc_server_allow_normal(svcpt, force) && - ptlrpc_nrs_req_pending_nolock(svcpt, false); -} - -/** - * Returns true if there are requests available in incoming - * request queue for processing and it is allowed to fetch them. - * User can call it w/o any lock but need to hold ptlrpc_service::scp_req_lock - * to get reliable result - * \see ptlrpc_server_allow_normal - * \see ptlrpc_server_allow high - */ -static inline bool -ptlrpc_server_request_pending(struct ptlrpc_service_part *svcpt, bool force) -{ - return ptlrpc_server_high_pending(svcpt, force) || - ptlrpc_server_normal_pending(svcpt, force); -} - -/** - * Fetch a request for processing from queue of unprocessed requests. - * Favors high-priority requests. - * Returns a pointer to fetched request. - */ -static struct ptlrpc_request * -ptlrpc_server_request_get(struct ptlrpc_service_part *svcpt, bool force) -{ - struct ptlrpc_request *req = NULL; - - spin_lock(&svcpt->scp_req_lock); - - if (ptlrpc_server_high_pending(svcpt, force)) { - req = ptlrpc_nrs_req_get_nolock(svcpt, true, force); - if (req) { - svcpt->scp_hreq_count++; - goto got_request; - } - } - - if (ptlrpc_server_normal_pending(svcpt, force)) { - req = ptlrpc_nrs_req_get_nolock(svcpt, false, force); - if (req) { - svcpt->scp_hreq_count = 0; - goto got_request; - } - } - - spin_unlock(&svcpt->scp_req_lock); - return NULL; - -got_request: - svcpt->scp_nreqs_active++; - if (req->rq_hp) - svcpt->scp_nhreqs_active++; - - spin_unlock(&svcpt->scp_req_lock); - - if (likely(req->rq_export)) - class_export_rpc_inc(req->rq_export); - - return req; -} - -/** - * Handle freshly incoming reqs, add to timed early reply list, - * pass on to regular request queue. - * All incoming requests pass through here before getting into - * ptlrpc_server_handle_req later on. - */ -static int -ptlrpc_server_handle_req_in(struct ptlrpc_service_part *svcpt, - struct ptlrpc_thread *thread) -{ - struct ptlrpc_service *svc = svcpt->scp_service; - struct ptlrpc_request *req; - __u32 deadline; - int rc; - - spin_lock(&svcpt->scp_lock); - if (list_empty(&svcpt->scp_req_incoming)) { - spin_unlock(&svcpt->scp_lock); - return 0; - } - - req = list_entry(svcpt->scp_req_incoming.next, - struct ptlrpc_request, rq_list); - list_del_init(&req->rq_list); - svcpt->scp_nreqs_incoming--; - /* Consider this still a "queued" request as far as stats are - * concerned - */ - spin_unlock(&svcpt->scp_lock); - - /* go through security check/transform */ - rc = sptlrpc_svc_unwrap_request(req); - switch (rc) { - case SECSVC_OK: - break; - case SECSVC_COMPLETE: - target_send_reply(req, 0, OBD_FAIL_MDS_ALL_REPLY_NET); - goto err_req; - case SECSVC_DROP: - goto err_req; - default: - LBUG(); - } - - /* - * for null-flavored rpc, msg has been unpacked by sptlrpc, although - * redo it wouldn't be harmful. - */ - if (SPTLRPC_FLVR_POLICY(req->rq_flvr.sf_rpc) != SPTLRPC_POLICY_NULL) { - rc = ptlrpc_unpack_req_msg(req, req->rq_reqlen); - if (rc != 0) { - CERROR("error unpacking request: ptl %d from %s x%llu\n", - svc->srv_req_portal, libcfs_id2str(req->rq_peer), - req->rq_xid); - goto err_req; - } - } - - rc = lustre_unpack_req_ptlrpc_body(req, MSG_PTLRPC_BODY_OFF); - if (rc) { - CERROR("error unpacking ptlrpc body: ptl %d from %s x%llu\n", - svc->srv_req_portal, libcfs_id2str(req->rq_peer), - req->rq_xid); - goto err_req; - } - - if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_DROP_REQ_OPC) && - lustre_msg_get_opc(req->rq_reqmsg) == cfs_fail_val) { - CERROR("drop incoming rpc opc %u, x%llu\n", - cfs_fail_val, req->rq_xid); - goto err_req; - } - - rc = -EINVAL; - if (lustre_msg_get_type(req->rq_reqmsg) != PTL_RPC_MSG_REQUEST) { - CERROR("wrong packet type received (type=%u) from %s\n", - lustre_msg_get_type(req->rq_reqmsg), - libcfs_id2str(req->rq_peer)); - goto err_req; - } - - switch (lustre_msg_get_opc(req->rq_reqmsg)) { - case MDS_WRITEPAGE: - case OST_WRITE: - req->rq_bulk_write = 1; - break; - case MDS_READPAGE: - case OST_READ: - case MGS_CONFIG_READ: - req->rq_bulk_read = 1; - break; - } - - CDEBUG(D_RPCTRACE, "got req x%llu\n", req->rq_xid); - - req->rq_export = class_conn2export( - lustre_msg_get_handle(req->rq_reqmsg)); - if (req->rq_export) { - rc = ptlrpc_check_req(req); - if (rc == 0) { - rc = sptlrpc_target_export_check(req->rq_export, req); - if (rc) - DEBUG_REQ(D_ERROR, req, "DROPPING req with illegal security flavor,"); - } - - if (rc) - goto err_req; - } - - /* req_in handling should/must be fast */ - if (ktime_get_real_seconds() - req->rq_arrival_time.tv_sec > 5) - DEBUG_REQ(D_WARNING, req, "Slow req_in handling %llds", - (s64)(ktime_get_real_seconds() - - req->rq_arrival_time.tv_sec)); - - /* Set rpc server deadline and add it to the timed list */ - deadline = (lustre_msghdr_get_flags(req->rq_reqmsg) & - MSGHDR_AT_SUPPORT) ? - /* The max time the client expects us to take */ - lustre_msg_get_timeout(req->rq_reqmsg) : obd_timeout; - req->rq_deadline = req->rq_arrival_time.tv_sec + deadline; - if (unlikely(deadline == 0)) { - DEBUG_REQ(D_ERROR, req, "Dropping request with 0 timeout"); - goto err_req; - } - - req->rq_svc_thread = thread; - if (thread) { - /* initialize request session, it is needed for request - * processing by target - */ - rc = lu_context_init(&req->rq_session, - LCT_SERVER_SESSION | LCT_NOREF); - if (rc) { - CERROR("%s: failure to initialize session: rc = %d\n", - thread->t_name, rc); - goto err_req; - } - req->rq_session.lc_thread = thread; - lu_context_enter(&req->rq_session); - req->rq_svc_thread->t_env->le_ses = &req->rq_session; - } - - ptlrpc_at_add_timed(req); - - /* Move it over to the request processing queue */ - rc = ptlrpc_server_request_add(svcpt, req); - if (rc) - goto err_req; - - wake_up(&svcpt->scp_waitq); - return 1; - -err_req: - ptlrpc_server_finish_request(svcpt, req); - - return 1; -} - -/** - * Main incoming request handling logic. - * Calls handler function from service to do actual processing. - */ -static int -ptlrpc_server_handle_request(struct ptlrpc_service_part *svcpt, - struct ptlrpc_thread *thread) -{ - struct ptlrpc_service *svc = svcpt->scp_service; - struct ptlrpc_request *request; - struct timespec64 work_start; - struct timespec64 work_end; - struct timespec64 timediff; - struct timespec64 arrived; - unsigned long timediff_usecs; - unsigned long arrived_usecs; - int fail_opc = 0; - - request = ptlrpc_server_request_get(svcpt, false); - if (!request) - return 0; - - if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_HPREQ_NOTIMEOUT)) - fail_opc = OBD_FAIL_PTLRPC_HPREQ_NOTIMEOUT; - else if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_HPREQ_TIMEOUT)) - fail_opc = OBD_FAIL_PTLRPC_HPREQ_TIMEOUT; - - if (unlikely(fail_opc)) { - if (request->rq_export && request->rq_ops) - OBD_FAIL_TIMEOUT(fail_opc, 4); - } - - ptlrpc_rqphase_move(request, RQ_PHASE_INTERPRET); - - if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_DUMP_LOG)) - libcfs_debug_dumplog(); - - ktime_get_real_ts64(&work_start); - timediff = timespec64_sub(work_start, request->rq_arrival_time); - timediff_usecs = timediff.tv_sec * USEC_PER_SEC + - timediff.tv_nsec / NSEC_PER_USEC; - if (likely(svc->srv_stats)) { - lprocfs_counter_add(svc->srv_stats, PTLRPC_REQWAIT_CNTR, - timediff_usecs); - lprocfs_counter_add(svc->srv_stats, PTLRPC_REQQDEPTH_CNTR, - svcpt->scp_nreqs_incoming); - lprocfs_counter_add(svc->srv_stats, PTLRPC_REQACTIVE_CNTR, - svcpt->scp_nreqs_active); - lprocfs_counter_add(svc->srv_stats, PTLRPC_TIMEOUT, - at_get(&svcpt->scp_at_estimate)); - } - - if (likely(request->rq_export)) { - if (unlikely(ptlrpc_check_req(request))) - goto put_conn; - } - - /* Discard requests queued for longer than the deadline. - * The deadline is increased if we send an early reply. - */ - if (ktime_get_real_seconds() > request->rq_deadline) { - DEBUG_REQ(D_ERROR, request, "Dropping timed-out request from %s: deadline %lld:%llds ago\n", - libcfs_id2str(request->rq_peer), - request->rq_deadline - - request->rq_arrival_time.tv_sec, - ktime_get_real_seconds() - request->rq_deadline); - goto put_conn; - } - - CDEBUG(D_RPCTRACE, "Handling RPC pname:cluuid+ref:pid:xid:nid:opc %s:%s+%d:%d:x%llu:%s:%d\n", - current->comm, - (request->rq_export ? - (char *)request->rq_export->exp_client_uuid.uuid : "0"), - (request->rq_export ? - atomic_read(&request->rq_export->exp_refcount) : -99), - lustre_msg_get_status(request->rq_reqmsg), request->rq_xid, - libcfs_id2str(request->rq_peer), - lustre_msg_get_opc(request->rq_reqmsg)); - - if (lustre_msg_get_opc(request->rq_reqmsg) != OBD_PING) - CFS_FAIL_TIMEOUT_MS(OBD_FAIL_PTLRPC_PAUSE_REQ, cfs_fail_val); - - CDEBUG(D_NET, "got req %llu\n", request->rq_xid); - - /* re-assign request and sesson thread to the current one */ - request->rq_svc_thread = thread; - if (thread) { - LASSERT(request->rq_session.lc_thread); - request->rq_session.lc_thread = thread; - request->rq_session.lc_cookie = 0x55; - thread->t_env->le_ses = &request->rq_session; - } - svc->srv_ops.so_req_handler(request); - - ptlrpc_rqphase_move(request, RQ_PHASE_COMPLETE); - -put_conn: - if (unlikely(ktime_get_real_seconds() > request->rq_deadline)) { - DEBUG_REQ(D_WARNING, request, - "Request took longer than estimated (%lld:%llds); " - "client may timeout.", - (s64)request->rq_deadline - - request->rq_arrival_time.tv_sec, - (s64)ktime_get_real_seconds() - request->rq_deadline); - } - - ktime_get_real_ts64(&work_end); - timediff = timespec64_sub(work_end, work_start); - timediff_usecs = timediff.tv_sec * USEC_PER_SEC + - timediff.tv_nsec / NSEC_PER_USEC; - arrived = timespec64_sub(work_end, request->rq_arrival_time); - arrived_usecs = arrived.tv_sec * USEC_PER_SEC + - arrived.tv_nsec / NSEC_PER_USEC; - CDEBUG(D_RPCTRACE, "Handled RPC pname:cluuid+ref:pid:xid:nid:opc %s:%s+%d:%d:x%llu:%s:%d Request processed in %ldus (%ldus total) trans %llu rc %d/%d\n", - current->comm, - (request->rq_export ? - (char *)request->rq_export->exp_client_uuid.uuid : "0"), - (request->rq_export ? - atomic_read(&request->rq_export->exp_refcount) : -99), - lustre_msg_get_status(request->rq_reqmsg), - request->rq_xid, - libcfs_id2str(request->rq_peer), - lustre_msg_get_opc(request->rq_reqmsg), - timediff_usecs, - arrived_usecs, - (request->rq_repmsg ? - lustre_msg_get_transno(request->rq_repmsg) : - request->rq_transno), - request->rq_status, - (request->rq_repmsg ? - lustre_msg_get_status(request->rq_repmsg) : -999)); - if (likely(svc->srv_stats && request->rq_reqmsg)) { - __u32 op = lustre_msg_get_opc(request->rq_reqmsg); - int opc = opcode_offset(op); - - if (opc > 0 && !(op == LDLM_ENQUEUE || op == MDS_REINT)) { - LASSERT(opc < LUSTRE_MAX_OPCODES); - lprocfs_counter_add(svc->srv_stats, - opc + EXTRA_MAX_OPCODES, - timediff_usecs); - } - } - if (unlikely(request->rq_early_count)) { - DEBUG_REQ(D_ADAPTTO, request, - "sent %d early replies before finishing in %llds", - request->rq_early_count, - (s64)work_end.tv_sec - - request->rq_arrival_time.tv_sec); - } - - ptlrpc_server_finish_active_request(svcpt, request); - - return 1; -} - -/** - * An internal function to process a single reply state object. - */ -static int -ptlrpc_handle_rs(struct ptlrpc_reply_state *rs) -{ - struct ptlrpc_service_part *svcpt = rs->rs_svcpt; - struct ptlrpc_service *svc = svcpt->scp_service; - struct obd_export *exp; - int nlocks; - int been_handled; - - exp = rs->rs_export; - - LASSERT(rs->rs_difficult); - LASSERT(rs->rs_scheduled); - LASSERT(list_empty(&rs->rs_list)); - - spin_lock(&exp->exp_lock); - /* Noop if removed already */ - list_del_init(&rs->rs_exp_list); - spin_unlock(&exp->exp_lock); - - /* The disk commit callback holds exp_uncommitted_replies_lock while it - * iterates over newly committed replies, removing them from - * exp_uncommitted_replies. It then drops this lock and schedules the - * replies it found for handling here. - * - * We can avoid contention for exp_uncommitted_replies_lock between the - * HRT threads and further commit callbacks by checking rs_committed - * which is set in the commit callback while it holds both - * rs_lock and exp_uncommitted_reples. - * - * If we see rs_committed clear, the commit callback _may_ not have - * handled this reply yet and we race with it to grab - * exp_uncommitted_replies_lock before removing the reply from - * exp_uncommitted_replies. Note that if we lose the race and the - * reply has already been removed, list_del_init() is a noop. - * - * If we see rs_committed set, we know the commit callback is handling, - * or has handled this reply since store reordering might allow us to - * see rs_committed set out of sequence. But since this is done - * holding rs_lock, we can be sure it has all completed once we hold - * rs_lock, which we do right next. - */ - if (!rs->rs_committed) { - spin_lock(&exp->exp_uncommitted_replies_lock); - list_del_init(&rs->rs_obd_list); - spin_unlock(&exp->exp_uncommitted_replies_lock); - } - - spin_lock(&rs->rs_lock); - - been_handled = rs->rs_handled; - rs->rs_handled = 1; - - nlocks = rs->rs_nlocks; /* atomic "steal", but */ - rs->rs_nlocks = 0; /* locks still on rs_locks! */ - - if (nlocks == 0 && !been_handled) { - /* If we see this, we should already have seen the warning - * in mds_steal_ack_locks() - */ - CDEBUG(D_HA, "All locks stolen from rs %p x%lld.t%lld o%d NID %s\n", - rs, - rs->rs_xid, rs->rs_transno, rs->rs_opc, - libcfs_nid2str(exp->exp_connection->c_peer.nid)); - } - - if ((!been_handled && rs->rs_on_net) || nlocks > 0) { - spin_unlock(&rs->rs_lock); - - if (!been_handled && rs->rs_on_net) { - LNetMDUnlink(rs->rs_md_h); - /* Ignore return code; we're racing with completion */ - } - - while (nlocks-- > 0) - ldlm_lock_decref(&rs->rs_locks[nlocks], - rs->rs_modes[nlocks]); - - spin_lock(&rs->rs_lock); - } - - rs->rs_scheduled = 0; - - if (!rs->rs_on_net) { - /* Off the net */ - spin_unlock(&rs->rs_lock); - - class_export_put(exp); - rs->rs_export = NULL; - ptlrpc_rs_decref(rs); - if (atomic_dec_and_test(&svcpt->scp_nreps_difficult) && - svc->srv_is_stopping) - wake_up_all(&svcpt->scp_waitq); - return 1; - } - - /* still on the net; callback will schedule */ - spin_unlock(&rs->rs_lock); - return 1; -} - -static void -ptlrpc_check_rqbd_pool(struct ptlrpc_service_part *svcpt) -{ - int avail = svcpt->scp_nrqbds_posted; - int low_water = test_req_buffer_pressure ? 0 : - svcpt->scp_service->srv_nbuf_per_group / 2; - - /* NB I'm not locking; just looking. */ - - /* CAVEAT EMPTOR: We might be allocating buffers here because we've - * allowed the request history to grow out of control. We could put a - * sanity check on that here and cull some history if we need the - * space. - */ - - if (avail <= low_water) - ptlrpc_grow_req_bufs(svcpt, 1); - - if (svcpt->scp_service->srv_stats) { - lprocfs_counter_add(svcpt->scp_service->srv_stats, - PTLRPC_REQBUF_AVAIL_CNTR, avail); - } -} - -static inline int -ptlrpc_threads_enough(struct ptlrpc_service_part *svcpt) -{ - return svcpt->scp_nreqs_active < - svcpt->scp_nthrs_running - 1 - - (svcpt->scp_service->srv_ops.so_hpreq_handler != NULL); -} - -/** - * allowed to create more threads - * user can call it w/o any lock but need to hold - * ptlrpc_service_part::scp_lock to get reliable result - */ -static inline int -ptlrpc_threads_increasable(struct ptlrpc_service_part *svcpt) -{ - return svcpt->scp_nthrs_running + - svcpt->scp_nthrs_starting < - svcpt->scp_service->srv_nthrs_cpt_limit; -} - -/** - * too many requests and allowed to create more threads - */ -static inline int -ptlrpc_threads_need_create(struct ptlrpc_service_part *svcpt) -{ - return !ptlrpc_threads_enough(svcpt) && - ptlrpc_threads_increasable(svcpt); -} - -static inline int -ptlrpc_thread_stopping(struct ptlrpc_thread *thread) -{ - return thread_is_stopping(thread) || - thread->t_svcpt->scp_service->srv_is_stopping; -} - -static inline int -ptlrpc_rqbd_pending(struct ptlrpc_service_part *svcpt) -{ - return !list_empty(&svcpt->scp_rqbd_idle) && - svcpt->scp_rqbd_timeout == 0; -} - -static inline int -ptlrpc_at_check(struct ptlrpc_service_part *svcpt) -{ - return svcpt->scp_at_check; -} - -/** - * requests wait on preprocessing - * user can call it w/o any lock but need to hold - * ptlrpc_service_part::scp_lock to get reliable result - */ -static inline int -ptlrpc_server_request_incoming(struct ptlrpc_service_part *svcpt) -{ - return !list_empty(&svcpt->scp_req_incoming); -} - -/* We perfer lifo queuing, but kernel doesn't provide that yet. */ -#ifndef wait_event_idle_exclusive_lifo -#define wait_event_idle_exclusive_lifo wait_event_idle_exclusive -#define wait_event_idle_exclusive_lifo_timeout wait_event_idle_exclusive_timeout -#endif - -static __attribute__((__noinline__)) int -ptlrpc_wait_event(struct ptlrpc_service_part *svcpt, - struct ptlrpc_thread *thread) -{ - /* Don't exit while there are replies to be handled */ - - /* XXX: Add this back when libcfs watchdog is merged upstream - lc_watchdog_disable(thread->t_watchdog); - */ - - cond_resched(); - - if (svcpt->scp_rqbd_timeout == 0) - wait_event_idle_exclusive_lifo( - svcpt->scp_waitq, - ptlrpc_thread_stopping(thread) || - ptlrpc_server_request_incoming(svcpt) || - ptlrpc_server_request_pending(svcpt, - false) || - ptlrpc_rqbd_pending(svcpt) || - ptlrpc_at_check(svcpt)); - else if (0 == wait_event_idle_exclusive_lifo_timeout( - svcpt->scp_waitq, - ptlrpc_thread_stopping(thread) || - ptlrpc_server_request_incoming(svcpt) || - ptlrpc_server_request_pending(svcpt, - false) || - ptlrpc_rqbd_pending(svcpt) || - ptlrpc_at_check(svcpt), - svcpt->scp_rqbd_timeout)) - svcpt->scp_rqbd_timeout = 0; - - if (ptlrpc_thread_stopping(thread)) - return -EINTR; - - /* - lc_watchdog_touch(thread->t_watchdog, - ptlrpc_server_get_timeout(svcpt)); - */ - return 0; -} - -/** - * Main thread body for service threads. - * Waits in a loop waiting for new requests to process to appear. - * Every time an incoming requests is added to its queue, a waitq - * is woken up and one of the threads will handle it. - */ -static int ptlrpc_main(void *arg) -{ - struct ptlrpc_thread *thread = arg; - struct ptlrpc_service_part *svcpt = thread->t_svcpt; - struct ptlrpc_service *svc = svcpt->scp_service; - struct ptlrpc_reply_state *rs; - struct group_info *ginfo = NULL; - struct lu_env *env; - int counter = 0, rc = 0; - - thread->t_pid = current->pid; - unshare_fs_struct(); - - /* NB: we will call cfs_cpt_bind() for all threads, because we - * might want to run lustre server only on a subset of system CPUs, - * in that case ->scp_cpt is CFS_CPT_ANY - */ - rc = cfs_cpt_bind(svc->srv_cptable, svcpt->scp_cpt); - if (rc != 0) { - CWARN("%s: failed to bind %s on CPT %d\n", - svc->srv_name, thread->t_name, svcpt->scp_cpt); - } - - ginfo = groups_alloc(0); - if (!ginfo) { - rc = -ENOMEM; - goto out; - } - - set_current_groups(ginfo); - put_group_info(ginfo); - - if (svc->srv_ops.so_thr_init) { - rc = svc->srv_ops.so_thr_init(thread); - if (rc) - goto out; - } - - env = kzalloc(sizeof(*env), GFP_KERNEL); - if (!env) { - rc = -ENOMEM; - goto out_srv_fini; - } - - rc = lu_context_init(&env->le_ctx, - svc->srv_ctx_tags | LCT_REMEMBER | LCT_NOREF); - if (rc) - goto out_srv_fini; - - thread->t_env = env; - env->le_ctx.lc_thread = thread; - env->le_ctx.lc_cookie = 0x6; - - while (!list_empty(&svcpt->scp_rqbd_idle)) { - rc = ptlrpc_server_post_idle_rqbds(svcpt); - if (rc >= 0) - continue; - - CERROR("Failed to post rqbd for %s on CPT %d: %d\n", - svc->srv_name, svcpt->scp_cpt, rc); - goto out_srv_fini; - } - - /* Alloc reply state structure for this one */ - rs = kvzalloc(svc->srv_max_reply_size, GFP_KERNEL); - if (!rs) { - rc = -ENOMEM; - goto out_srv_fini; - } - - spin_lock(&svcpt->scp_lock); - - LASSERT(thread_is_starting(thread)); - thread_clear_flags(thread, SVC_STARTING); - - LASSERT(svcpt->scp_nthrs_starting == 1); - svcpt->scp_nthrs_starting--; - - /* SVC_STOPPING may already be set here if someone else is trying - * to stop the service while this new thread has been dynamically - * forked. We still set SVC_RUNNING to let our creator know that - * we are now running, however we will exit as soon as possible - */ - thread_add_flags(thread, SVC_RUNNING); - svcpt->scp_nthrs_running++; - spin_unlock(&svcpt->scp_lock); - - /* wake up our creator in case he's still waiting. */ - wake_up(&thread->t_ctl_waitq); - - /* - thread->t_watchdog = lc_watchdog_add(ptlrpc_server_get_timeout(svcpt), - NULL, NULL); - */ - - spin_lock(&svcpt->scp_rep_lock); - list_add(&rs->rs_list, &svcpt->scp_rep_idle); - wake_up(&svcpt->scp_rep_waitq); - spin_unlock(&svcpt->scp_rep_lock); - - CDEBUG(D_NET, "service thread %d (#%d) started\n", thread->t_id, - svcpt->scp_nthrs_running); - - /* XXX maintain a list of all managed devices: insert here */ - while (!ptlrpc_thread_stopping(thread)) { - if (ptlrpc_wait_event(svcpt, thread)) - break; - - ptlrpc_check_rqbd_pool(svcpt); - - if (ptlrpc_threads_need_create(svcpt)) { - /* Ignore return code - we tried... */ - ptlrpc_start_thread(svcpt, 0); - } - - /* Process all incoming reqs before handling any */ - if (ptlrpc_server_request_incoming(svcpt)) { - lu_context_enter(&env->le_ctx); - env->le_ses = NULL; - ptlrpc_server_handle_req_in(svcpt, thread); - lu_context_exit(&env->le_ctx); - - /* but limit ourselves in case of flood */ - if (counter++ < 100) - continue; - counter = 0; - } - - if (ptlrpc_at_check(svcpt)) - ptlrpc_at_check_timed(svcpt); - - if (ptlrpc_server_request_pending(svcpt, false)) { - lu_context_enter(&env->le_ctx); - ptlrpc_server_handle_request(svcpt, thread); - lu_context_exit(&env->le_ctx); - } - - if (ptlrpc_rqbd_pending(svcpt) && - ptlrpc_server_post_idle_rqbds(svcpt) < 0) { - /* I just failed to repost request buffers. - * Wait for a timeout (unless something else - * happens) before I try again - */ - svcpt->scp_rqbd_timeout = HZ / 10; - CDEBUG(D_RPCTRACE, "Posted buffers: %d\n", - svcpt->scp_nrqbds_posted); - } - } - - /* - lc_watchdog_delete(thread->t_watchdog); - thread->t_watchdog = NULL; - */ - -out_srv_fini: - /* - * deconstruct service specific state created by ptlrpc_start_thread() - */ - if (svc->srv_ops.so_thr_done) - svc->srv_ops.so_thr_done(thread); - - if (env) { - lu_context_fini(&env->le_ctx); - kfree(env); - } -out: - CDEBUG(D_RPCTRACE, "service thread [ %p : %u ] %d exiting: rc %d\n", - thread, thread->t_pid, thread->t_id, rc); - - spin_lock(&svcpt->scp_lock); - if (thread_test_and_clear_flags(thread, SVC_STARTING)) - svcpt->scp_nthrs_starting--; - - if (thread_test_and_clear_flags(thread, SVC_RUNNING)) { - /* must know immediately */ - svcpt->scp_nthrs_running--; - } - - thread->t_id = rc; - thread_add_flags(thread, SVC_STOPPED); - - wake_up(&thread->t_ctl_waitq); - spin_unlock(&svcpt->scp_lock); - - return rc; -} - -static int hrt_dont_sleep(struct ptlrpc_hr_thread *hrt, - struct list_head *replies) -{ - int result; - - spin_lock(&hrt->hrt_lock); - - list_splice_init(&hrt->hrt_queue, replies); - result = ptlrpc_hr.hr_stopping || !list_empty(replies); - - spin_unlock(&hrt->hrt_lock); - return result; -} - -/** - * Main body of "handle reply" function. - * It processes acked reply states - */ -static int ptlrpc_hr_main(void *arg) -{ - struct ptlrpc_hr_thread *hrt = arg; - struct ptlrpc_hr_partition *hrp = hrt->hrt_partition; - LIST_HEAD(replies); - char threadname[20]; - int rc; - - snprintf(threadname, sizeof(threadname), "ptlrpc_hr%02d_%03d", - hrp->hrp_cpt, hrt->hrt_id); - unshare_fs_struct(); - - rc = cfs_cpt_bind(ptlrpc_hr.hr_cpt_table, hrp->hrp_cpt); - if (rc != 0) { - CWARN("Failed to bind %s on CPT %d of CPT table %p: rc = %d\n", - threadname, hrp->hrp_cpt, ptlrpc_hr.hr_cpt_table, rc); - } - - atomic_inc(&hrp->hrp_nstarted); - wake_up(&ptlrpc_hr.hr_waitq); - - while (!ptlrpc_hr.hr_stopping) { - wait_event_idle(hrt->hrt_waitq, hrt_dont_sleep(hrt, &replies)); - - while (!list_empty(&replies)) { - struct ptlrpc_reply_state *rs; - - rs = list_entry(replies.prev, struct ptlrpc_reply_state, - rs_list); - list_del_init(&rs->rs_list); - ptlrpc_handle_rs(rs); - } - } - - atomic_inc(&hrp->hrp_nstopped); - wake_up(&ptlrpc_hr.hr_waitq); - - return 0; -} - -static void ptlrpc_stop_hr_threads(void) -{ - struct ptlrpc_hr_partition *hrp; - int i; - int j; - - ptlrpc_hr.hr_stopping = 1; - - cfs_percpt_for_each(hrp, i, ptlrpc_hr.hr_partitions) { - if (!hrp->hrp_thrs) - continue; /* uninitialized */ - for (j = 0; j < hrp->hrp_nthrs; j++) - wake_up_all(&hrp->hrp_thrs[j].hrt_waitq); - } - - cfs_percpt_for_each(hrp, i, ptlrpc_hr.hr_partitions) { - if (!hrp->hrp_thrs) - continue; /* uninitialized */ - wait_event(ptlrpc_hr.hr_waitq, - atomic_read(&hrp->hrp_nstopped) == - atomic_read(&hrp->hrp_nstarted)); - } -} - -static int ptlrpc_start_hr_threads(void) -{ - struct ptlrpc_hr_partition *hrp; - int i; - int j; - - cfs_percpt_for_each(hrp, i, ptlrpc_hr.hr_partitions) { - int rc = 0; - - for (j = 0; j < hrp->hrp_nthrs; j++) { - struct ptlrpc_hr_thread *hrt = &hrp->hrp_thrs[j]; - struct task_struct *task; - - task = kthread_run(ptlrpc_hr_main, - &hrp->hrp_thrs[j], - "ptlrpc_hr%02d_%03d", - hrp->hrp_cpt, hrt->hrt_id); - if (IS_ERR(task)) { - rc = PTR_ERR(task); - break; - } - } - wait_event(ptlrpc_hr.hr_waitq, - atomic_read(&hrp->hrp_nstarted) == j); - - if (rc < 0) { - CERROR("cannot start reply handler thread %d:%d: rc = %d\n", - i, j, rc); - ptlrpc_stop_hr_threads(); - return rc; - } - } - return 0; -} - -static void ptlrpc_svcpt_stop_threads(struct ptlrpc_service_part *svcpt) -{ - struct ptlrpc_thread *thread; - LIST_HEAD(zombie); - - CDEBUG(D_INFO, "Stopping threads for service %s\n", - svcpt->scp_service->srv_name); - - spin_lock(&svcpt->scp_lock); - /* let the thread know that we would like it to stop asap */ - list_for_each_entry(thread, &svcpt->scp_threads, t_link) { - CDEBUG(D_INFO, "Stopping thread %s #%u\n", - svcpt->scp_service->srv_thread_name, thread->t_id); - thread_add_flags(thread, SVC_STOPPING); - } - - wake_up_all(&svcpt->scp_waitq); - - while (!list_empty(&svcpt->scp_threads)) { - thread = list_entry(svcpt->scp_threads.next, - struct ptlrpc_thread, t_link); - if (thread_is_stopped(thread)) { - list_del(&thread->t_link); - list_add(&thread->t_link, &zombie); - continue; - } - spin_unlock(&svcpt->scp_lock); - - CDEBUG(D_INFO, "waiting for stopping-thread %s #%u\n", - svcpt->scp_service->srv_thread_name, thread->t_id); - wait_event_idle(thread->t_ctl_waitq, - thread_is_stopped(thread)); - - spin_lock(&svcpt->scp_lock); - } - - spin_unlock(&svcpt->scp_lock); - - while (!list_empty(&zombie)) { - thread = list_entry(zombie.next, - struct ptlrpc_thread, t_link); - list_del(&thread->t_link); - kfree(thread); - } -} - -/** - * Stops all threads of a particular service \a svc - */ -static void ptlrpc_stop_all_threads(struct ptlrpc_service *svc) -{ - struct ptlrpc_service_part *svcpt; - int i; - - ptlrpc_service_for_each_part(svcpt, i, svc) { - if (svcpt->scp_service) - ptlrpc_svcpt_stop_threads(svcpt); - } -} - -int ptlrpc_start_threads(struct ptlrpc_service *svc) -{ - int rc = 0; - int i; - int j; - - /* We require 2 threads min, see note in ptlrpc_server_handle_request */ - LASSERT(svc->srv_nthrs_cpt_init >= PTLRPC_NTHRS_INIT); - - for (i = 0; i < svc->srv_ncpts; i++) { - for (j = 0; j < svc->srv_nthrs_cpt_init; j++) { - rc = ptlrpc_start_thread(svc->srv_parts[i], 1); - if (rc == 0) - continue; - - if (rc != -EMFILE) - goto failed; - /* We have enough threads, don't start more. b=15759 */ - break; - } - } - - return 0; - failed: - CERROR("cannot start %s thread #%d_%d: rc %d\n", - svc->srv_thread_name, i, j, rc); - ptlrpc_stop_all_threads(svc); - return rc; -} - -int ptlrpc_start_thread(struct ptlrpc_service_part *svcpt, int wait) -{ - struct ptlrpc_thread *thread; - struct ptlrpc_service *svc; - struct task_struct *task; - int rc; - - svc = svcpt->scp_service; - - CDEBUG(D_RPCTRACE, "%s[%d] started %d min %d max %d\n", - svc->srv_name, svcpt->scp_cpt, svcpt->scp_nthrs_running, - svc->srv_nthrs_cpt_init, svc->srv_nthrs_cpt_limit); - - again: - if (unlikely(svc->srv_is_stopping)) - return -ESRCH; - - if (!ptlrpc_threads_increasable(svcpt) || - (OBD_FAIL_CHECK(OBD_FAIL_TGT_TOOMANY_THREADS) && - svcpt->scp_nthrs_running == svc->srv_nthrs_cpt_init - 1)) - return -EMFILE; - - thread = kzalloc_node(sizeof(*thread), GFP_NOFS, - cfs_cpt_spread_node(svc->srv_cptable, - svcpt->scp_cpt)); - if (!thread) - return -ENOMEM; - init_waitqueue_head(&thread->t_ctl_waitq); - - spin_lock(&svcpt->scp_lock); - if (!ptlrpc_threads_increasable(svcpt)) { - spin_unlock(&svcpt->scp_lock); - kfree(thread); - return -EMFILE; - } - - if (svcpt->scp_nthrs_starting != 0) { - /* serialize starting because some modules (obdfilter) - * might require unique and contiguous t_id - */ - LASSERT(svcpt->scp_nthrs_starting == 1); - spin_unlock(&svcpt->scp_lock); - kfree(thread); - if (wait) { - CDEBUG(D_INFO, "Waiting for creating thread %s #%d\n", - svc->srv_thread_name, svcpt->scp_thr_nextid); - schedule(); - goto again; - } - - CDEBUG(D_INFO, "Creating thread %s #%d race, retry later\n", - svc->srv_thread_name, svcpt->scp_thr_nextid); - return -EAGAIN; - } - - svcpt->scp_nthrs_starting++; - thread->t_id = svcpt->scp_thr_nextid++; - thread_add_flags(thread, SVC_STARTING); - thread->t_svcpt = svcpt; - - list_add(&thread->t_link, &svcpt->scp_threads); - spin_unlock(&svcpt->scp_lock); - - if (svcpt->scp_cpt >= 0) { - snprintf(thread->t_name, sizeof(thread->t_name), "%s%02d_%03d", - svc->srv_thread_name, svcpt->scp_cpt, thread->t_id); - } else { - snprintf(thread->t_name, sizeof(thread->t_name), "%s_%04d", - svc->srv_thread_name, thread->t_id); - } - - CDEBUG(D_RPCTRACE, "starting thread '%s'\n", thread->t_name); - task = kthread_run(ptlrpc_main, thread, "%s", thread->t_name); - if (IS_ERR(task)) { - rc = PTR_ERR(task); - CERROR("cannot start thread '%s': rc = %d\n", - thread->t_name, rc); - spin_lock(&svcpt->scp_lock); - --svcpt->scp_nthrs_starting; - if (thread_is_stopping(thread)) { - /* this ptlrpc_thread is being handled - * by ptlrpc_svcpt_stop_threads now - */ - thread_add_flags(thread, SVC_STOPPED); - wake_up(&thread->t_ctl_waitq); - spin_unlock(&svcpt->scp_lock); - } else { - list_del(&thread->t_link); - spin_unlock(&svcpt->scp_lock); - kfree(thread); - } - return rc; - } - - if (!wait) - return 0; - - wait_event_idle(thread->t_ctl_waitq, - thread_is_running(thread) || thread_is_stopped(thread)); - - rc = thread_is_stopped(thread) ? thread->t_id : 0; - return rc; -} - -int ptlrpc_hr_init(void) -{ - struct ptlrpc_hr_partition *hrp; - struct ptlrpc_hr_thread *hrt; - int rc; - int i; - int j; - int weight; - - memset(&ptlrpc_hr, 0, sizeof(ptlrpc_hr)); - ptlrpc_hr.hr_cpt_table = cfs_cpt_tab; - - ptlrpc_hr.hr_partitions = cfs_percpt_alloc(ptlrpc_hr.hr_cpt_table, - sizeof(*hrp)); - if (!ptlrpc_hr.hr_partitions) - return -ENOMEM; - - init_waitqueue_head(&ptlrpc_hr.hr_waitq); - - weight = cpumask_weight(topology_sibling_cpumask(0)); - - cfs_percpt_for_each(hrp, i, ptlrpc_hr.hr_partitions) { - hrp->hrp_cpt = i; - - atomic_set(&hrp->hrp_nstarted, 0); - atomic_set(&hrp->hrp_nstopped, 0); - - hrp->hrp_nthrs = cfs_cpt_weight(ptlrpc_hr.hr_cpt_table, i); - hrp->hrp_nthrs /= weight; - if (hrp->hrp_nthrs == 0) - hrp->hrp_nthrs = 1; - - hrp->hrp_thrs = - kzalloc_node(hrp->hrp_nthrs * sizeof(*hrt), GFP_NOFS, - cfs_cpt_spread_node(ptlrpc_hr.hr_cpt_table, - i)); - if (!hrp->hrp_thrs) { - rc = -ENOMEM; - goto out; - } - - for (j = 0; j < hrp->hrp_nthrs; j++) { - hrt = &hrp->hrp_thrs[j]; - - hrt->hrt_id = j; - hrt->hrt_partition = hrp; - init_waitqueue_head(&hrt->hrt_waitq); - spin_lock_init(&hrt->hrt_lock); - INIT_LIST_HEAD(&hrt->hrt_queue); - } - } - - rc = ptlrpc_start_hr_threads(); -out: - if (rc != 0) - ptlrpc_hr_fini(); - return rc; -} - -void ptlrpc_hr_fini(void) -{ - struct ptlrpc_hr_partition *hrp; - int i; - - if (!ptlrpc_hr.hr_partitions) - return; - - ptlrpc_stop_hr_threads(); - - cfs_percpt_for_each(hrp, i, ptlrpc_hr.hr_partitions) { - kfree(hrp->hrp_thrs); - } - - cfs_percpt_free(ptlrpc_hr.hr_partitions); - ptlrpc_hr.hr_partitions = NULL; -} - -/** - * Wait until all already scheduled replies are processed. - */ -static void ptlrpc_wait_replies(struct ptlrpc_service_part *svcpt) -{ - while (1) { - int rc; - - rc = wait_event_idle_timeout( - svcpt->scp_waitq, - atomic_read(&svcpt->scp_nreps_difficult) == 0, - 10 * HZ); - if (rc > 0) - break; - CWARN("Unexpectedly long timeout %s %p\n", - svcpt->scp_service->srv_name, svcpt->scp_service); - } -} - -static void -ptlrpc_service_del_atimer(struct ptlrpc_service *svc) -{ - struct ptlrpc_service_part *svcpt; - int i; - - /* early disarm AT timer... */ - ptlrpc_service_for_each_part(svcpt, i, svc) { - if (svcpt->scp_service) - del_timer(&svcpt->scp_at_timer); - } -} - -static void -ptlrpc_service_unlink_rqbd(struct ptlrpc_service *svc) -{ - struct ptlrpc_service_part *svcpt; - struct ptlrpc_request_buffer_desc *rqbd; - int cnt; - int rc; - int i; - - /* All history will be culled when the next request buffer is - * freed in ptlrpc_service_purge_all() - */ - svc->srv_hist_nrqbds_cpt_max = 0; - - rc = LNetClearLazyPortal(svc->srv_req_portal); - LASSERT(rc == 0); - - ptlrpc_service_for_each_part(svcpt, i, svc) { - if (!svcpt->scp_service) - break; - - /* Unlink all the request buffers. This forces a 'final' - * event with its 'unlink' flag set for each posted rqbd - */ - list_for_each_entry(rqbd, &svcpt->scp_rqbd_posted, - rqbd_list) { - rc = LNetMDUnlink(rqbd->rqbd_md_h); - LASSERT(rc == 0 || rc == -ENOENT); - } - } - - ptlrpc_service_for_each_part(svcpt, i, svc) { - if (!svcpt->scp_service) - break; - - /* Wait for the network to release any buffers - * it's currently filling - */ - spin_lock(&svcpt->scp_lock); - while (svcpt->scp_nrqbds_posted != 0) { - spin_unlock(&svcpt->scp_lock); - /* Network access will complete in finite time but - * the HUGE timeout lets us CWARN for visibility - * of sluggish LNDs - */ - cnt = 0; - while (cnt < LONG_UNLINK && - (rc = wait_event_idle_timeout(svcpt->scp_waitq, - svcpt->scp_nrqbds_posted == 0, - HZ)) == 0) - cnt++; - if (rc == 0) { - CWARN("Service %s waiting for request buffers\n", - svcpt->scp_service->srv_name); - } - spin_lock(&svcpt->scp_lock); - } - spin_unlock(&svcpt->scp_lock); - } -} - -static void -ptlrpc_service_purge_all(struct ptlrpc_service *svc) -{ - struct ptlrpc_service_part *svcpt; - struct ptlrpc_request_buffer_desc *rqbd; - struct ptlrpc_request *req; - struct ptlrpc_reply_state *rs; - int i; - - ptlrpc_service_for_each_part(svcpt, i, svc) { - if (!svcpt->scp_service) - break; - - spin_lock(&svcpt->scp_rep_lock); - while (!list_empty(&svcpt->scp_rep_active)) { - rs = list_entry(svcpt->scp_rep_active.next, - struct ptlrpc_reply_state, rs_list); - spin_lock(&rs->rs_lock); - ptlrpc_schedule_difficult_reply(rs); - spin_unlock(&rs->rs_lock); - } - spin_unlock(&svcpt->scp_rep_lock); - - /* purge the request queue. NB No new replies (rqbds - * all unlinked) and no service threads, so I'm the only - * thread noodling the request queue now - */ - while (!list_empty(&svcpt->scp_req_incoming)) { - req = list_entry(svcpt->scp_req_incoming.next, - struct ptlrpc_request, rq_list); - - list_del(&req->rq_list); - svcpt->scp_nreqs_incoming--; - ptlrpc_server_finish_request(svcpt, req); - } - - while (ptlrpc_server_request_pending(svcpt, true)) { - req = ptlrpc_server_request_get(svcpt, true); - ptlrpc_server_finish_active_request(svcpt, req); - } - - LASSERT(list_empty(&svcpt->scp_rqbd_posted)); - LASSERT(svcpt->scp_nreqs_incoming == 0); - LASSERT(svcpt->scp_nreqs_active == 0); - /* history should have been culled by - * ptlrpc_server_finish_request - */ - LASSERT(svcpt->scp_hist_nrqbds == 0); - - /* Now free all the request buffers since nothing - * references them any more... - */ - - while (!list_empty(&svcpt->scp_rqbd_idle)) { - rqbd = list_entry(svcpt->scp_rqbd_idle.next, - struct ptlrpc_request_buffer_desc, - rqbd_list); - ptlrpc_free_rqbd(rqbd); - } - ptlrpc_wait_replies(svcpt); - - while (!list_empty(&svcpt->scp_rep_idle)) { - rs = list_entry(svcpt->scp_rep_idle.next, - struct ptlrpc_reply_state, - rs_list); - list_del(&rs->rs_list); - kvfree(rs); - } - } -} - -static void -ptlrpc_service_free(struct ptlrpc_service *svc) -{ - struct ptlrpc_service_part *svcpt; - struct ptlrpc_at_array *array; - int i; - - ptlrpc_service_for_each_part(svcpt, i, svc) { - if (!svcpt->scp_service) - break; - - /* In case somebody rearmed this in the meantime */ - del_timer(&svcpt->scp_at_timer); - array = &svcpt->scp_at_array; - - kfree(array->paa_reqs_array); - array->paa_reqs_array = NULL; - kfree(array->paa_reqs_count); - array->paa_reqs_count = NULL; - } - - ptlrpc_service_for_each_part(svcpt, i, svc) - kfree(svcpt); - - if (svc->srv_cpts) - cfs_expr_list_values_free(svc->srv_cpts, svc->srv_ncpts); - - kfree(svc); -} - -int ptlrpc_unregister_service(struct ptlrpc_service *service) -{ - CDEBUG(D_NET, "%s: tearing down\n", service->srv_name); - - service->srv_is_stopping = 1; - - mutex_lock(&ptlrpc_all_services_mutex); - list_del_init(&service->srv_list); - mutex_unlock(&ptlrpc_all_services_mutex); - - ptlrpc_service_del_atimer(service); - ptlrpc_stop_all_threads(service); - - ptlrpc_service_unlink_rqbd(service); - ptlrpc_service_purge_all(service); - ptlrpc_service_nrs_cleanup(service); - - ptlrpc_lprocfs_unregister_service(service); - ptlrpc_sysfs_unregister_service(service); - - ptlrpc_service_free(service); - - return 0; -} -EXPORT_SYMBOL(ptlrpc_unregister_service); |