--- /dev/null
+/*
+ * 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.sun.com/software/products/lustre/docs/GPLv2.pdf
+ *
+ * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ *
+ * GPL HEADER END
+ */
+/*
+ * Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
+ * Use is subject to license terms.
+ *
+ * Copyright (c) 2010, 2012, 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 "../include/obd_support.h"
+#include "../include/obd_class.h"
+#include "../include/lustre_net.h"
+#include "../include/lu_object.h"
+#include "../../include/linux/lnet/types.h"
+#include "ptlrpc_internal.h"
+
+/* The following are visible and mutable through /sys/module/ptlrpc */
+int test_req_buffer_pressure = 0;
+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;
+
+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;
+
+ OBD_CPT_ALLOC_PTR(rqbd, svc->srv_cptable, svcpt->scp_cpt);
+ if (rqbd == NULL)
+ 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);
+ OBD_CPT_ALLOC_LARGE(rqbd->rqbd_buffer, svc->srv_cptable,
+ svcpt->scp_cpt, svc->srv_buf_size);
+ if (rqbd->rqbd_buffer == NULL) {
+ OBD_FREE_PTR(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;
+}
+
+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);
+
+ OBD_FREE_LARGE(rqbd->rqbd_buffer, svcpt->scp_service->srv_buf_size);
+ OBD_FREE_PTR(rqbd);
+}
+
+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 == NULL) {
+ 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;
+}
+
+/**
+ * Part of Rep-Ack logic.
+ * Puts a lock and its mode into reply state associated to request reply.
+ */
+void
+ptlrpc_save_lock(struct ptlrpc_request *req,
+ struct lustre_handle *lock, int mode, int no_ack)
+{
+ struct ptlrpc_reply_state *rs = req->rq_reply_state;
+ int idx;
+
+ LASSERT(rs != NULL);
+ LASSERT(rs->rs_nlocks < RS_MAX_LOCKS);
+
+ if (req->rq_export->exp_disconnected) {
+ ldlm_lock_decref(lock, mode);
+ } else {
+ idx = rs->rs_nlocks++;
+ rs->rs_locks[idx] = *lock;
+ rs->rs_modes[idx] = mode;
+ rs->rs_difficult = 1;
+ rs->rs_no_ack = !!no_ack;
+ }
+}
+EXPORT_SYMBOL(ptlrpc_save_lock);
+
+
+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_table 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;
+};
+
+struct rs_batch {
+ struct list_head rsb_replies;
+ unsigned int rsb_n_replies;
+ struct ptlrpc_service_part *rsb_svcpt;
+};
+
+/** reply handling service. */
+static struct ptlrpc_hr_service ptlrpc_hr;
+
+/**
+ * maximum number of replies scheduled in one batch
+ */
+#define MAX_SCHEDULED 256
+
+/**
+ * Initialize a reply batch.
+ *
+ * \param b batch
+ */
+static void rs_batch_init(struct rs_batch *b)
+{
+ memset(b, 0, sizeof(*b));
+ INIT_LIST_HEAD(&b->rsb_replies);
+}
+
+/**
+ * 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];
+}
+
+/**
+ * Dispatch all replies accumulated in the batch to one from
+ * dedicated reply handling threads.
+ *
+ * \param b batch
+ */
+static void rs_batch_dispatch(struct rs_batch *b)
+{
+ if (b->rsb_n_replies != 0) {
+ struct ptlrpc_hr_thread *hrt;
+
+ hrt = ptlrpc_hr_select(b->rsb_svcpt);
+
+ spin_lock(&hrt->hrt_lock);
+ list_splice_init(&b->rsb_replies, &hrt->hrt_queue);
+ spin_unlock(&hrt->hrt_lock);
+
+ wake_up(&hrt->hrt_waitq);
+ b->rsb_n_replies = 0;
+ }
+}
+
+/**
+ * Add a reply to a batch.
+ * Add one reply object to a batch, schedule batched replies if overload.
+ *
+ * \param b batch
+ * \param rs reply
+ */
+static void rs_batch_add(struct rs_batch *b, struct ptlrpc_reply_state *rs)
+{
+ struct ptlrpc_service_part *svcpt = rs->rs_svcpt;
+
+ if (svcpt != b->rsb_svcpt || b->rsb_n_replies >= MAX_SCHEDULED) {
+ if (b->rsb_svcpt != NULL) {
+ rs_batch_dispatch(b);
+ spin_unlock(&b->rsb_svcpt->scp_rep_lock);
+ }
+ spin_lock(&svcpt->scp_rep_lock);
+ b->rsb_svcpt = svcpt;
+ }
+ spin_lock(&rs->rs_lock);
+ rs->rs_scheduled_ever = 1;
+ if (rs->rs_scheduled == 0) {
+ list_move(&rs->rs_list, &b->rsb_replies);
+ rs->rs_scheduled = 1;
+ b->rsb_n_replies++;
+ }
+ rs->rs_committed = 1;
+ spin_unlock(&rs->rs_lock);
+}
+
+/**
+ * Reply batch finalization.
+ * Dispatch remaining replies from the batch
+ * and release remaining spinlock.
+ *
+ * \param b batch
+ */
+static void rs_batch_fini(struct rs_batch *b)
+{
+ if (b->rsb_svcpt != NULL) {
+ rs_batch_dispatch(b);
+ spin_unlock(&b->rsb_svcpt->scp_rep_lock);
+ }
+}
+
+#define DECLARE_RS_BATCH(b) struct rs_batch b
+
+
+/**
+ * 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);
+
+void ptlrpc_commit_replies(struct obd_export *exp)
+{
+ struct ptlrpc_reply_state *rs, *nxt;
+ DECLARE_RS_BATCH(batch);
+
+ rs_batch_init(&batch);
+ /* Find any replies that have been committed and get their service
+ * to attend to complete them. */
+
+ /* CAVEAT EMPTOR: spinlock ordering!!! */
+ spin_lock(&exp->exp_uncommitted_replies_lock);
+ list_for_each_entry_safe(rs, nxt, &exp->exp_uncommitted_replies,
+ rs_obd_list) {
+ LASSERT(rs->rs_difficult);
+ /* VBR: per-export last_committed */
+ LASSERT(rs->rs_export);
+ if (rs->rs_transno <= exp->exp_last_committed) {
+ list_del_init(&rs->rs_obd_list);
+ rs_batch_add(&batch, rs);
+ }
+ }
+ spin_unlock(&exp->exp_uncommitted_replies_lock);
+ rs_batch_fini(&batch);
+}
+EXPORT_SYMBOL(ptlrpc_commit_replies);
+
+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(unsigned long castmeharder)
+{
+ struct ptlrpc_service_part *svcpt;
+
+ svcpt = (struct ptlrpc_service_part *)castmeharder;
+
+ svcpt->scp_at_check = 1;
+ svcpt->scp_at_checktime = cfs_time_current();
+ 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 init;
+ unsigned total;
+ unsigned 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_thread_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) */
+ OBD_CPT_ALLOC(array->paa_reqs_array,
+ svc->srv_cptable, cpt, sizeof(struct list_head) * size);
+ if (array->paa_reqs_array == NULL)
+ return -ENOMEM;
+
+ for (index = 0; index < size; index++)
+ INIT_LIST_HEAD(&array->paa_reqs_array[index]);
+
+ OBD_CPT_ALLOC(array->paa_reqs_count,
+ svc->srv_cptable, cpt, sizeof(__u32) * size);
+ if (array->paa_reqs_count == NULL)
+ goto failed;
+
+ cfs_timer_init(&svcpt->scp_at_timer, ptlrpc_at_timer, svcpt);
+ /* 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 failed;
+
+ return 0;
+
+ failed:
+ if (array->paa_reqs_count != NULL) {
+ OBD_FREE(array->paa_reqs_count, sizeof(__u32) * size);
+ array->paa_reqs_count = NULL;
+ }
+
+ if (array->paa_reqs_array != NULL) {
+ OBD_FREE(array->paa_reqs_array,
+ sizeof(struct list_head) * array->paa_size);
+ 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 proc_dir_entry *proc_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 == NULL)
+ cptable = cfs_cpt_table;
+
+ if (!conf->psc_thr.tc_cpu_affinity) {
+ ncpts = 1;
+ } else {
+ ncpts = cfs_cpt_number(cptable);
+ if (cconf->cc_pattern != NULL) {
+ 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);
+ if (cpts != NULL)
+ OBD_FREE(cpts, sizeof(*cpts) * ncpts);
+ return ERR_PTR(rc < 0 ? rc : -EINVAL);
+ }
+ ncpts = rc;
+ }
+ }
+
+ OBD_ALLOC(service, offsetof(struct ptlrpc_service, srv_parts[ncpts]));
+ if (service == NULL) {
+ if (cpts != NULL)
+ OBD_FREE(cpts, sizeof(*cpts) * ncpts);
+ 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 != NULL ? cpts[i] : i;
+
+ OBD_CPT_ALLOC(svcpt, cptable, cpt, sizeof(*svcpt));
+ if (svcpt == NULL) {
+ 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 (proc_entry != NULL)
+ ptlrpc_lprocfs_register_service(proc_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.
+ */
+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;
+ struct list_head *tmp;
+ struct list_head *nxt;
+
+ 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(tmp, &rqbd->rqbd_reqs) {
+ req = list_entry(tmp, struct ptlrpc_request,
+ 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);
+
+ list_for_each_safe(tmp, nxt, &rqbd->rqbd_reqs) {
+ req = list_entry(rqbd->rqbd_reqs.next,
+ 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);
+ }
+}
+
+/** Change request export and move hp request from old export to new */
+void ptlrpc_request_change_export(struct ptlrpc_request *req,
+ struct obd_export *export)
+{
+ if (req->rq_export != NULL) {
+ if (!list_empty(&req->rq_exp_list)) {
+ /* remove rq_exp_list from last export */
+ 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);
+
+ /* export has one reference already, so it`s safe to
+ * add req to export queue here and get another
+ * reference for request later */
+ spin_lock_bh(&export->exp_rpc_lock);
+ list_add(&req->rq_exp_list, &export->exp_hp_rpcs);
+ spin_unlock_bh(&export->exp_rpc_lock);
+ }
+ class_export_rpc_dec(req->rq_export);
+ class_export_put(req->rq_export);
+ }
+
+ /* request takes one export refcount */
+ req->rq_export = class_export_get(export);
+ class_export_rpc_inc(export);
+
+ return;
+}
+
+/**
+ * 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);
+
+ 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 != NULL)
+ class_export_rpc_dec(req->rq_export);
+
+ ptlrpc_server_finish_request(svcpt, req);
+}
+
+/**
+ * This function makes sure dead exports are evicted in a timely manner.
+ * This function is only called when some export receives a message (i.e.,
+ * the network is up.)
+ */
+static void ptlrpc_update_export_timer(struct obd_export *exp, long extra_delay)
+{
+ struct obd_export *oldest_exp;
+ time_t oldest_time, new_time;
+
+ LASSERT(exp);
+
+ /* Compensate for slow machines, etc, by faking our request time
+ into the future. Although this can break the strict time-ordering
+ of the list, we can be really lazy here - we don't have to evict
+ at the exact right moment. Eventually, all silent exports
+ will make it to the top of the list. */
+
+ /* Do not pay attention on 1sec or smaller renewals. */
+ new_time = get_seconds() + extra_delay;
+ if (exp->exp_last_request_time + 1 /*second */ >= new_time)
+ return;
+
+ exp->exp_last_request_time = new_time;
+
+ /* exports may get disconnected from the chain even though the
+ export has references, so we must keep the spin lock while
+ manipulating the lists */
+ spin_lock(&exp->exp_obd->obd_dev_lock);
+
+ if (list_empty(&exp->exp_obd_chain_timed)) {
+ /* this one is not timed */
+ spin_unlock(&exp->exp_obd->obd_dev_lock);
+ return;
+ }
+
+ list_move_tail(&exp->exp_obd_chain_timed,
+ &exp->exp_obd->obd_exports_timed);
+
+ oldest_exp = list_entry(exp->exp_obd->obd_exports_timed.next,
+ struct obd_export, exp_obd_chain_timed);
+ oldest_time = oldest_exp->exp_last_request_time;
+ spin_unlock(&exp->exp_obd->obd_dev_lock);
+
+ if (exp->exp_obd->obd_recovering) {
+ /* be nice to everyone during recovery */
+ return;
+ }
+
+ /* Note - racing to start/reset the obd_eviction timer is safe */
+ if (exp->exp_obd->obd_eviction_timer == 0) {
+ /* Check if the oldest entry is expired. */
+ if (get_seconds() > (oldest_time + PING_EVICT_TIMEOUT +
+ extra_delay)) {
+ /* We need a second timer, in case the net was down and
+ * it just came back. Since the pinger may skip every
+ * other PING_INTERVAL (see note in ptlrpc_pinger_main),
+ * we better wait for 3. */
+ exp->exp_obd->obd_eviction_timer =
+ get_seconds() + 3 * PING_INTERVAL;
+ CDEBUG(D_HA, "%s: Think about evicting %s from "CFS_TIME_T"\n",
+ exp->exp_obd->obd_name,
+ obd_export_nid2str(oldest_exp), oldest_time);
+ }
+ } else {
+ if (get_seconds() >
+ (exp->exp_obd->obd_eviction_timer + extra_delay)) {
+ /* The evictor won't evict anyone who we've heard from
+ * recently, so we don't have to check before we start
+ * it. */
+ if (!ping_evictor_wake(exp))
+ exp->exp_obd->obd_eviction_timer = 0;
+ }
+ }
+}
+
+/**
+ * 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 == NULL || 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 != NULL) ? obd->obd_name : "unknown");
+ rc = -ENODEV;
+ } else if (lustre_msg_get_flags(req->rq_reqmsg) &
+ (MSG_REPLAY | MSG_REQ_REPLAY_DONE) &&
+ !obd->obd_recovering) {
+ 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 &&
+ !obd->obd_recovering) {
+ 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) {
+ cfs_timer_disarm(&svcpt->scp_at_timer);
+ return;
+ }
+
+ /* Set timer for closest deadline */
+ next = (__s32)(array->paa_deadline - get_seconds() -
+ at_early_margin);
+ if (next <= 0) {
+ ptlrpc_at_timer((unsigned long)svcpt);
+ } else {
+ cfs_timer_arm(&svcpt->scp_at_timer, cfs_time_shift(next));
+ 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));
+
+ index = (unsigned long)req->rq_deadline % array->paa_size;
+ 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--;
+}
+
+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 - get_seconds();
+ time_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;
+ }
+
+ if (req->rq_export &&
+ lustre_msg_get_flags(req->rq_reqmsg) &
+ (MSG_REPLAY | MSG_REQ_REPLAY_DONE | MSG_LOCK_REPLAY_DONE)) {
+ /* During recovery, we don't want to send too many early
+ * replies, but on the other hand we want to make sure the
+ * client has enough time to resend if the rpc is lost. So
+ * during the recovery period send at least 4 early replies,
+ * spacing them every at_extra if we can. at_estimate should
+ * always equal this fixed value during recovery. */
+ at_measured(&svcpt->scp_at_estimate, min(at_extra,
+ req->rq_export->exp_obd->obd_recovery_timeout / 4));
+ } else {
+ /* Fake our processing time into the future to ask the clients
+ * for some extra amount of time */
+ at_measured(&svcpt->scp_at_estimate, at_extra +
+ get_seconds() -
+ req->rq_arrival_time.tv_sec);
+
+ /* Check to see if we've actually increased the deadline -
+ * we may be past adaptive_max */
+ if (req->rq_deadline >= req->rq_arrival_time.tv_sec +
+ at_get(&svcpt->scp_at_estimate)) {
+ DEBUG_REQ(D_WARNING, req, "Couldn't add any time (%ld/%ld), not sending early reply\n",
+ olddl, req->rq_arrival_time.tv_sec +
+ at_get(&svcpt->scp_at_estimate) -
+ get_seconds());
+ return -ETIMEDOUT;
+ }
+ }
+ newdl = get_seconds() + at_get(&svcpt->scp_at_estimate);
+
+ reqcopy = ptlrpc_request_cache_alloc(GFP_NOFS);
+ if (reqcopy == NULL)
+ return -ENOMEM;
+ OBD_ALLOC_LARGE(reqmsg, req->rq_reqlen);
+ 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 == NULL) {
+ 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);
+ OBD_FREE_LARGE(reqmsg, req->rq_reqlen);
+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 int 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;
+ time_t deadline;
+ time_t now = get_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 0;
+ }
+ delay = cfs_time_sub(cfs_time_current(), svcpt->scp_at_checktime);
+ svcpt->scp_at_check = 0;
+
+ if (array->paa_count == 0) {
+ spin_unlock(&svcpt->scp_at_lock);
+ return 0;
+ }
+
+ /* 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 0;
+ }
+
+ /* 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;
+ index = (unsigned long)array->paa_deadline % array->paa_size;
+ 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=" CFS_DURATION_T "(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);
+ }
+
+ return 1; /* return "did_something" for liblustre */
+}
+
+/**
+ * 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);
+ /**
+ * XXX: Out of all current
+ * ptlrpc_hpreq_ops::hpreq_check(), only
+ * ldlm_cancel_hpreq_check() can return an error code;
+ * other functions assert in similar places, which seems
+ * odd. What also does not seem right is that handlers
+ * for those RPCs do not assert on the same checks, but
+ * rather handle the error cases. e.g. see
+ * ost_rw_hpreq_check(), and ost_brw_read(),
+ * ost_brw_write().
+ */
+ if (rc < 0)
+ return rc;
+ LASSERT(rc == 0 || 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_hpreq_check(struct ptlrpc_request *req)
+{
+ return 1;
+}
+
+static struct ptlrpc_hpreq_ops ptlrpc_hpreq_common = {
+ .hpreq_check = ptlrpc_hpreq_check,
+};
+
+/* Hi-Priority RPC check by RPC operation code. */
+int ptlrpc_hpreq_handler(struct ptlrpc_request *req)
+{
+ int opc = lustre_msg_get_opc(req->rq_reqmsg);
+
+ /* Check for export to let only reconnects for not yet evicted
+ * export to become a HP rpc. */
+ if ((req->rq_export != NULL) &&
+ (opc == OBD_PING || opc == MDS_CONNECT || opc == OST_CONNECT))
+ req->rq_ops = &ptlrpc_hpreq_common;
+
+ return 0;
+}
+EXPORT_SYMBOL(ptlrpc_hpreq_handler);
+
+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 != NULL)
+ 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 != NULL)
+ 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 != NULL) {
+ 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 != NULL) {
+ 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;
+ ptlrpc_update_export_timer(req->rq_export, 0);
+ }
+
+ /* req_in handling should/must be fast */
+ if (get_seconds() - req->rq_arrival_time.tv_sec > 5)
+ DEBUG_REQ(D_WARNING, req, "Slow req_in handling "CFS_DURATION_T"s",
+ cfs_time_sub(get_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;
+
+ 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 timeval work_start;
+ struct timeval work_end;
+ long timediff;
+ int rc;
+ int fail_opc = 0;
+
+ request = ptlrpc_server_request_get(svcpt, false);
+ if (request == NULL)
+ 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();
+
+ do_gettimeofday(&work_start);
+ timediff = cfs_timeval_sub(&work_start, &request->rq_arrival_time,
+ NULL);
+ if (likely(svc->srv_stats != NULL)) {
+ lprocfs_counter_add(svc->srv_stats, PTLRPC_REQWAIT_CNTR,
+ timediff);
+ 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));
+ }
+
+ rc = lu_context_init(&request->rq_session, LCT_SESSION | LCT_NOREF);
+ if (rc) {
+ CERROR("Failure to initialize session: %d\n", rc);
+ goto out_req;
+ }
+ request->rq_session.lc_thread = thread;
+ request->rq_session.lc_cookie = 0x5;
+ lu_context_enter(&request->rq_session);
+
+ CDEBUG(D_NET, "got req %llu\n", request->rq_xid);
+
+ request->rq_svc_thread = thread;
+ if (thread)
+ request->rq_svc_thread->t_env->le_ses = &request->rq_session;
+
+ if (likely(request->rq_export)) {
+ if (unlikely(ptlrpc_check_req(request)))
+ goto put_conn;
+ ptlrpc_update_export_timer(request->rq_export, timediff >> 19);
+ }
+
+ /* Discard requests queued for longer than the deadline.
+ The deadline is increased if we send an early reply. */
+ if (get_seconds() > request->rq_deadline) {
+ DEBUG_REQ(D_ERROR, request, "Dropping timed-out request from %s: deadline " CFS_DURATION_T ":" CFS_DURATION_T "s ago\n",
+ libcfs_id2str(request->rq_peer),
+ cfs_time_sub(request->rq_deadline,
+ request->rq_arrival_time.tv_sec),
+ cfs_time_sub(get_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);
+
+ rc = svc->srv_ops.so_req_handler(request);
+
+ ptlrpc_rqphase_move(request, RQ_PHASE_COMPLETE);
+
+put_conn:
+ lu_context_exit(&request->rq_session);
+ lu_context_fini(&request->rq_session);
+
+ if (unlikely(get_seconds() > request->rq_deadline)) {
+ DEBUG_REQ(D_WARNING, request,
+ "Request took longer than estimated ("
+ CFS_DURATION_T":"CFS_DURATION_T
+ "s); client may timeout.",
+ cfs_time_sub(request->rq_deadline,
+ request->rq_arrival_time.tv_sec),
+ cfs_time_sub(get_seconds(),
+ request->rq_deadline));
+ }
+
+ do_gettimeofday(&work_end);
+ timediff = cfs_timeval_sub(&work_end, &work_start, NULL);
+ 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,
+ cfs_timeval_sub(&work_end, &request->rq_arrival_time, NULL),
+ (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 != NULL && request->rq_reqmsg != NULL)) {
+ __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);
+ }
+ }
+ if (unlikely(request->rq_early_count)) {
+ DEBUG_REQ(D_ADAPTTO, request,
+ "sent %d early replies before finishing in "
+ CFS_DURATION_T"s",
+ request->rq_early_count,
+ cfs_time_sub(work_end.tv_sec,
+ request->rq_arrival_time.tv_sec));
+ }
+
+out_req:
+ 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 int
+ptlrpc_retry_rqbds(void *arg)
+{
+ struct ptlrpc_service_part *svcpt = (struct ptlrpc_service_part *)arg;
+
+ svcpt->scp_rqbd_timeout = 0;
+ return -ETIMEDOUT;
+}
+
+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);
+}
+
+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 */
+ struct l_wait_info lwi = LWI_TIMEOUT(svcpt->scp_rqbd_timeout,
+ ptlrpc_retry_rqbds, svcpt);
+
+ /* XXX: Add this back when libcfs watchdog is merged upstream
+ lc_watchdog_disable(thread->t_watchdog);
+ */
+
+ cond_resched();
+
+ l_wait_event_exclusive_head(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), &lwi);
+
+ 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 = (struct ptlrpc_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 != NULL) {
+ rc = svc->srv_ops.so_thr_init(thread);
+ if (rc)
+ goto out;
+ }
+
+ OBD_ALLOC_PTR(env);
+ if (env == NULL) {
+ 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 */
+ OBD_ALLOC_LARGE(rs, svc->srv_max_reply_size);
+ 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 = cfs_time_seconds(1) / 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 != NULL)
+ svc->srv_ops.so_thr_done(thread);
+
+ if (env != NULL) {
+ lu_context_fini(&env->le_ctx);
+ OBD_FREE_PTR(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 = (struct ptlrpc_hr_thread *)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) {
+ l_wait_condition(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 == NULL)
+ 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 == NULL)
+ 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];
+ rc = PTR_ERR(kthread_run(ptlrpc_hr_main,
+ &hrp->hrp_thrs[j],
+ "ptlrpc_hr%02d_%03d",
+ hrp->hrp_cpt,
+ hrt->hrt_id));
+ if (IS_ERR_VALUE(rc))
+ break;
+ }
+ wait_event(ptlrpc_hr.hr_waitq,
+ atomic_read(&hrp->hrp_nstarted) == j);
+ if (!IS_ERR_VALUE(rc))
+ continue;
+
+ CERROR("Reply handling thread %d:%d Failed on starting: 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 l_wait_info lwi = { 0 };
+ 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);
+ l_wait_event(thread->t_ctl_waitq,
+ thread_is_stopped(thread), &lwi);
+
+ 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);
+ OBD_FREE_PTR(thread);
+ }
+}
+
+/**
+ * Stops all threads of a particular service \a svc
+ */
+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 != NULL)
+ ptlrpc_svcpt_stop_threads(svcpt);
+ }
+}
+EXPORT_SYMBOL(ptlrpc_stop_all_threads);
+
+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;
+}
+EXPORT_SYMBOL(ptlrpc_start_threads);
+
+int ptlrpc_start_thread(struct ptlrpc_service_part *svcpt, int wait)
+{
+ struct l_wait_info lwi = { 0 };
+ struct ptlrpc_thread *thread;
+ struct ptlrpc_service *svc;
+ int rc;
+
+ LASSERT(svcpt != NULL);
+
+ 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;
+
+ OBD_CPT_ALLOC_PTR(thread, svc->srv_cptable, svcpt->scp_cpt);
+ if (thread == NULL)
+ return -ENOMEM;
+ init_waitqueue_head(&thread->t_ctl_waitq);
+
+ spin_lock(&svcpt->scp_lock);
+ if (!ptlrpc_threads_increasable(svcpt)) {
+ spin_unlock(&svcpt->scp_lock);
+ OBD_FREE_PTR(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);
+ OBD_FREE_PTR(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);
+ rc = PTR_ERR(kthread_run(ptlrpc_main, thread, "%s", thread->t_name));
+ if (IS_ERR_VALUE(rc)) {
+ 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);
+ OBD_FREE_PTR(thread);
+ }
+ return rc;
+ }
+
+ if (!wait)
+ return 0;
+
+ l_wait_event(thread->t_ctl_waitq,
+ thread_is_running(thread) || thread_is_stopped(thread),
+ &lwi);
+
+ 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_table;
+
+ ptlrpc_hr.hr_partitions = cfs_percpt_alloc(ptlrpc_hr.hr_cpt_table,
+ sizeof(*hrp));
+ if (ptlrpc_hr.hr_partitions == NULL)
+ return -ENOMEM;
+
+ init_waitqueue_head(&ptlrpc_hr.hr_waitq);
+
+ weight = cpumask_weight(topology_thread_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;
+
+ LASSERT(hrp->hrp_nthrs > 0);
+ OBD_CPT_ALLOC(hrp->hrp_thrs, ptlrpc_hr.hr_cpt_table, i,
+ hrp->hrp_nthrs * sizeof(*hrt));
+ if (hrp->hrp_thrs == NULL) {
+ 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 == NULL)
+ return;
+
+ ptlrpc_stop_hr_threads();
+
+ cfs_percpt_for_each(hrp, i, ptlrpc_hr.hr_partitions) {
+ if (hrp->hrp_thrs != NULL) {
+ OBD_FREE(hrp->hrp_thrs,
+ hrp->hrp_nthrs * sizeof(hrp->hrp_thrs[0]));
+ }
+ }
+
+ 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;
+ struct l_wait_info lwi = LWI_TIMEOUT(cfs_time_seconds(10),
+ NULL, NULL);
+
+ rc = l_wait_event(svcpt->scp_waitq,
+ atomic_read(&svcpt->scp_nreps_difficult) == 0, &lwi);
+ 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 != NULL)
+ cfs_timer_disarm(&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;
+ struct l_wait_info lwi;
+ 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 == NULL)
+ 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 == NULL)
+ 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 NALs */
+ lwi = LWI_TIMEOUT_INTERVAL(
+ cfs_time_seconds(LONG_UNLINK),
+ cfs_time_seconds(1), NULL, NULL);
+ rc = l_wait_event(svcpt->scp_waitq,
+ svcpt->scp_nrqbds_posted == 0, &lwi);
+ if (rc == -ETIMEDOUT) {
+ 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 == NULL)
+ 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);
+ OBD_FREE_LARGE(rs, svc->srv_max_reply_size);
+ }
+ }
+}
+
+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 == NULL)
+ break;
+
+ /* In case somebody rearmed this in the meantime */
+ cfs_timer_disarm(&svcpt->scp_at_timer);
+ array = &svcpt->scp_at_array;
+
+ if (array->paa_reqs_array != NULL) {
+ OBD_FREE(array->paa_reqs_array,
+ sizeof(struct list_head) * array->paa_size);
+ array->paa_reqs_array = NULL;
+ }
+
+ if (array->paa_reqs_count != NULL) {
+ OBD_FREE(array->paa_reqs_count,
+ sizeof(__u32) * array->paa_size);
+ array->paa_reqs_count = NULL;
+ }
+ }
+
+ ptlrpc_service_for_each_part(svcpt, i, svc)
+ OBD_FREE_PTR(svcpt);
+
+ if (svc->srv_cpts != NULL)
+ cfs_expr_list_values_free(svc->srv_cpts, svc->srv_ncpts);
+
+ OBD_FREE(svc, offsetof(struct ptlrpc_service,
+ srv_parts[svc->srv_ncpts]));
+}
+
+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_service_free(service);
+
+ return 0;
+}
+EXPORT_SYMBOL(ptlrpc_unregister_service);
+
+/**
+ * Returns 0 if the service is healthy.
+ *
+ * Right now, it just checks to make sure that requests aren't languishing
+ * in the queue. We'll use this health check to govern whether a node needs
+ * to be shot, so it's intentionally non-aggressive. */
+int ptlrpc_svcpt_health_check(struct ptlrpc_service_part *svcpt)
+{
+ struct ptlrpc_request *request = NULL;
+ struct timeval right_now;
+ long timediff;
+
+ do_gettimeofday(&right_now);
+
+ spin_lock(&svcpt->scp_req_lock);
+ /* How long has the next entry been waiting? */
+ if (ptlrpc_server_high_pending(svcpt, true))
+ request = ptlrpc_nrs_req_peek_nolock(svcpt, true);
+ else if (ptlrpc_server_normal_pending(svcpt, true))
+ request = ptlrpc_nrs_req_peek_nolock(svcpt, false);
+
+ if (request == NULL) {
+ spin_unlock(&svcpt->scp_req_lock);
+ return 0;
+ }
+
+ timediff = cfs_timeval_sub(&right_now, &request->rq_arrival_time, NULL);
+ spin_unlock(&svcpt->scp_req_lock);
+
+ if ((timediff / ONE_MILLION) >
+ (AT_OFF ? obd_timeout * 3 / 2 : at_max)) {
+ CERROR("%s: unhealthy - request has been waiting %lds\n",
+ svcpt->scp_service->srv_name, timediff / ONE_MILLION);
+ return -1;
+ }
+
+ return 0;
+}
+
+int
+ptlrpc_service_health_check(struct ptlrpc_service *svc)
+{
+ struct ptlrpc_service_part *svcpt;
+ int i;
+
+ if (svc == NULL)
+ return 0;
+
+ ptlrpc_service_for_each_part(svcpt, i, svc) {
+ int rc = ptlrpc_svcpt_health_check(svcpt);
+
+ if (rc != 0)
+ return rc;
+ }
+ return 0;
+}
+EXPORT_SYMBOL(ptlrpc_service_health_check);
Code Review / kvmfornfv.git / blobdiff