diff options
Diffstat (limited to 'drivers/staging/lustre/lustre/ptlrpc/events.c')
| -rw-r--r-- | drivers/staging/lustre/lustre/ptlrpc/events.c | 585 |
1 files changed, 0 insertions, 585 deletions
diff --git a/drivers/staging/lustre/lustre/ptlrpc/events.c b/drivers/staging/lustre/lustre/ptlrpc/events.c deleted file mode 100644 index 130bacc2c891..000000000000 --- a/drivers/staging/lustre/lustre/ptlrpc/events.c +++ /dev/null @@ -1,585 +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) 2012, 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/libcfs/libcfs.h> -# ifdef __mips64__ -# include <linux/kernel.h> -# endif - -#include <obd_class.h> -#include <lustre_net.h> -#include <lustre_sec.h> -#include "ptlrpc_internal.h" - -struct lnet_handle_eq ptlrpc_eq_h; - -/* - * Client's outgoing request callback - */ -void request_out_callback(struct lnet_event *ev) -{ - struct ptlrpc_cb_id *cbid = ev->md.user_ptr; - struct ptlrpc_request *req = cbid->cbid_arg; - bool wakeup = false; - - LASSERT(ev->type == LNET_EVENT_SEND || ev->type == LNET_EVENT_UNLINK); - LASSERT(ev->unlinked); - - DEBUG_REQ(D_NET, req, "type %d, status %d", ev->type, ev->status); - - sptlrpc_request_out_callback(req); - - spin_lock(&req->rq_lock); - req->rq_real_sent = ktime_get_real_seconds(); - req->rq_req_unlinked = 1; - /* reply_in_callback happened before request_out_callback? */ - if (req->rq_reply_unlinked) - wakeup = true; - - if (ev->type == LNET_EVENT_UNLINK || ev->status != 0) { - /* Failed send: make it seem like the reply timed out, just - * like failing sends in client.c does currently... - */ - req->rq_net_err = 1; - wakeup = true; - } - - if (wakeup) - ptlrpc_client_wake_req(req); - - spin_unlock(&req->rq_lock); - - ptlrpc_req_finished(req); -} - -/* - * Client's incoming reply callback - */ -void reply_in_callback(struct lnet_event *ev) -{ - struct ptlrpc_cb_id *cbid = ev->md.user_ptr; - struct ptlrpc_request *req = cbid->cbid_arg; - - DEBUG_REQ(D_NET, req, "type %d, status %d", ev->type, ev->status); - - LASSERT(ev->type == LNET_EVENT_PUT || ev->type == LNET_EVENT_UNLINK); - LASSERT(ev->md.start == req->rq_repbuf); - LASSERT(ev->offset + ev->mlength <= req->rq_repbuf_len); - /* We've set LNET_MD_MANAGE_REMOTE for all outgoing requests - * for adaptive timeouts' early reply. - */ - LASSERT((ev->md.options & LNET_MD_MANAGE_REMOTE) != 0); - - spin_lock(&req->rq_lock); - - req->rq_receiving_reply = 0; - req->rq_early = 0; - if (ev->unlinked) - req->rq_reply_unlinked = 1; - - if (ev->status) - goto out_wake; - - if (ev->type == LNET_EVENT_UNLINK) { - LASSERT(ev->unlinked); - DEBUG_REQ(D_NET, req, "unlink"); - goto out_wake; - } - - if (ev->mlength < ev->rlength) { - CDEBUG(D_RPCTRACE, "truncate req %p rpc %d - %d+%d\n", req, - req->rq_replen, ev->rlength, ev->offset); - req->rq_reply_truncated = 1; - req->rq_replied = 1; - req->rq_status = -EOVERFLOW; - req->rq_nob_received = ev->rlength + ev->offset; - goto out_wake; - } - - if ((ev->offset == 0) && - ((lustre_msghdr_get_flags(req->rq_reqmsg) & MSGHDR_AT_SUPPORT))) { - /* Early reply */ - DEBUG_REQ(D_ADAPTTO, req, - "Early reply received: mlen=%u offset=%d replen=%d replied=%d unlinked=%d", - ev->mlength, ev->offset, - req->rq_replen, req->rq_replied, ev->unlinked); - - req->rq_early_count++; /* number received, client side */ - - /* already got the real reply or buffers are already unlinked */ - if (req->rq_replied || req->rq_reply_unlinked == 1) - goto out_wake; - - req->rq_early = 1; - req->rq_reply_off = ev->offset; - req->rq_nob_received = ev->mlength; - /* And we're still receiving */ - req->rq_receiving_reply = 1; - } else { - /* Real reply */ - req->rq_rep_swab_mask = 0; - req->rq_replied = 1; - /* Got reply, no resend required */ - req->rq_resend = 0; - req->rq_reply_off = ev->offset; - req->rq_nob_received = ev->mlength; - /* LNetMDUnlink can't be called under the LNET_LOCK, - * so we must unlink in ptlrpc_unregister_reply - */ - DEBUG_REQ(D_INFO, req, - "reply in flags=%x mlen=%u offset=%d replen=%d", - lustre_msg_get_flags(req->rq_reqmsg), - ev->mlength, ev->offset, req->rq_replen); - } - - req->rq_import->imp_last_reply_time = ktime_get_real_seconds(); - -out_wake: - /* NB don't unlock till after wakeup; req can disappear under us - * since we don't have our own ref - */ - ptlrpc_client_wake_req(req); - spin_unlock(&req->rq_lock); -} - -/* - * Client's bulk has been written/read - */ -void client_bulk_callback(struct lnet_event *ev) -{ - struct ptlrpc_cb_id *cbid = ev->md.user_ptr; - struct ptlrpc_bulk_desc *desc = cbid->cbid_arg; - struct ptlrpc_request *req; - - LASSERT((ptlrpc_is_bulk_put_sink(desc->bd_type) && - ev->type == LNET_EVENT_PUT) || - (ptlrpc_is_bulk_get_source(desc->bd_type) && - ev->type == LNET_EVENT_GET) || - ev->type == LNET_EVENT_UNLINK); - LASSERT(ev->unlinked); - - if (CFS_FAIL_CHECK_ORSET(OBD_FAIL_PTLRPC_CLIENT_BULK_CB, CFS_FAIL_ONCE)) - ev->status = -EIO; - - if (CFS_FAIL_CHECK_ORSET(OBD_FAIL_PTLRPC_CLIENT_BULK_CB2, - CFS_FAIL_ONCE)) - ev->status = -EIO; - - CDEBUG((ev->status == 0) ? D_NET : D_ERROR, - "event type %d, status %d, desc %p\n", - ev->type, ev->status, desc); - - spin_lock(&desc->bd_lock); - req = desc->bd_req; - LASSERT(desc->bd_md_count > 0); - desc->bd_md_count--; - - if (ev->type != LNET_EVENT_UNLINK && ev->status == 0) { - desc->bd_nob_transferred += ev->mlength; - desc->bd_sender = ev->sender; - } else { - /* start reconnect and resend if network error hit */ - spin_lock(&req->rq_lock); - req->rq_net_err = 1; - spin_unlock(&req->rq_lock); - } - - if (ev->status != 0) - desc->bd_failure = 1; - - /* NB don't unlock till after wakeup; desc can disappear under us - * otherwise - */ - if (desc->bd_md_count == 0) - ptlrpc_client_wake_req(desc->bd_req); - - spin_unlock(&desc->bd_lock); -} - -/* - * We will have percpt request history list for ptlrpc service in upcoming - * patches because we don't want to be serialized by current per-service - * history operations. So we require history ID can (somehow) show arriving - * order w/o grabbing global lock, and user can sort them in userspace. - * - * This is how we generate history ID for ptlrpc_request: - * ---------------------------------------------------- - * | 32 bits | 16 bits | (16 - X)bits | X bits | - * ---------------------------------------------------- - * | seconds | usec / 16 | sequence | CPT id | - * ---------------------------------------------------- - * - * it might not be precise but should be good enough. - */ - -#define REQS_CPT_BITS(svcpt) ((svcpt)->scp_service->srv_cpt_bits) - -#define REQS_SEC_SHIFT 32 -#define REQS_USEC_SHIFT 16 -#define REQS_SEQ_SHIFT(svcpt) REQS_CPT_BITS(svcpt) - -static void ptlrpc_req_add_history(struct ptlrpc_service_part *svcpt, - struct ptlrpc_request *req) -{ - __u64 sec = req->rq_arrival_time.tv_sec; - __u32 usec = req->rq_arrival_time.tv_nsec / NSEC_PER_USEC / 16; /* usec / 16 */ - __u64 new_seq; - - /* set sequence ID for request and add it to history list, - * it must be called with hold svcpt::scp_lock - */ - - new_seq = (sec << REQS_SEC_SHIFT) | - (usec << REQS_USEC_SHIFT) | - (svcpt->scp_cpt < 0 ? 0 : svcpt->scp_cpt); - - if (new_seq > svcpt->scp_hist_seq) { - /* This handles the initial case of scp_hist_seq == 0 or - * we just jumped into a new time window - */ - svcpt->scp_hist_seq = new_seq; - } else { - LASSERT(REQS_SEQ_SHIFT(svcpt) < REQS_USEC_SHIFT); - /* NB: increase sequence number in current usec bucket, - * however, it's possible that we used up all bits for - * sequence and jumped into the next usec bucket (future time), - * then we hope there will be less RPCs per bucket at some - * point, and sequence will catch up again - */ - svcpt->scp_hist_seq += (1ULL << REQS_SEQ_SHIFT(svcpt)); - new_seq = svcpt->scp_hist_seq; - } - - req->rq_history_seq = new_seq; - - list_add_tail(&req->rq_history_list, &svcpt->scp_hist_reqs); -} - -/* - * Server's incoming request callback - */ -void request_in_callback(struct lnet_event *ev) -{ - struct ptlrpc_cb_id *cbid = ev->md.user_ptr; - struct ptlrpc_request_buffer_desc *rqbd = cbid->cbid_arg; - struct ptlrpc_service_part *svcpt = rqbd->rqbd_svcpt; - struct ptlrpc_service *service = svcpt->scp_service; - struct ptlrpc_request *req; - - LASSERT(ev->type == LNET_EVENT_PUT || - ev->type == LNET_EVENT_UNLINK); - LASSERT((char *)ev->md.start >= rqbd->rqbd_buffer); - LASSERT((char *)ev->md.start + ev->offset + ev->mlength <= - rqbd->rqbd_buffer + service->srv_buf_size); - - CDEBUG((ev->status == 0) ? D_NET : D_ERROR, - "event type %d, status %d, service %s\n", - ev->type, ev->status, service->srv_name); - - if (ev->unlinked) { - /* If this is the last request message to fit in the - * request buffer we can use the request object embedded in - * rqbd. Note that if we failed to allocate a request, - * we'd have to re-post the rqbd, which we can't do in this - * context. - */ - req = &rqbd->rqbd_req; - memset(req, 0, sizeof(*req)); - } else { - LASSERT(ev->type == LNET_EVENT_PUT); - if (ev->status != 0) { - /* We moaned above already... */ - return; - } - req = ptlrpc_request_cache_alloc(GFP_ATOMIC); - if (!req) { - CERROR("Can't allocate incoming request descriptor: Dropping %s RPC from %s\n", - service->srv_name, - libcfs_id2str(ev->initiator)); - return; - } - } - - ptlrpc_srv_req_init(req); - /* NB we ABSOLUTELY RELY on req being zeroed, so pointers are NULL, - * flags are reset and scalars are zero. We only set the message - * size to non-zero if this was a successful receive. - */ - req->rq_xid = ev->match_bits; - req->rq_reqbuf = ev->md.start + ev->offset; - if (ev->type == LNET_EVENT_PUT && ev->status == 0) - req->rq_reqdata_len = ev->mlength; - ktime_get_real_ts64(&req->rq_arrival_time); - req->rq_peer = ev->initiator; - req->rq_self = ev->target.nid; - req->rq_rqbd = rqbd; - req->rq_phase = RQ_PHASE_NEW; - if (ev->type == LNET_EVENT_PUT) - CDEBUG(D_INFO, "incoming req@%p x%llu msgsize %u\n", - req, req->rq_xid, ev->mlength); - - CDEBUG(D_RPCTRACE, "peer: %s\n", libcfs_id2str(req->rq_peer)); - - spin_lock(&svcpt->scp_lock); - - ptlrpc_req_add_history(svcpt, req); - - if (ev->unlinked) { - svcpt->scp_nrqbds_posted--; - CDEBUG(D_INFO, "Buffer complete: %d buffers still posted\n", - svcpt->scp_nrqbds_posted); - - /* Normally, don't complain about 0 buffers posted; LNET won't - * drop incoming reqs since we set the portal lazy - */ - if (test_req_buffer_pressure && - ev->type != LNET_EVENT_UNLINK && - svcpt->scp_nrqbds_posted == 0) - CWARN("All %s request buffers busy\n", - service->srv_name); - - /* req takes over the network's ref on rqbd */ - } else { - /* req takes a ref on rqbd */ - rqbd->rqbd_refcount++; - } - - list_add_tail(&req->rq_list, &svcpt->scp_req_incoming); - svcpt->scp_nreqs_incoming++; - - /* NB everything can disappear under us once the request - * has been queued and we unlock, so do the wake now... - */ - wake_up(&svcpt->scp_waitq); - - spin_unlock(&svcpt->scp_lock); -} - -/* - * Server's outgoing reply callback - */ -void reply_out_callback(struct lnet_event *ev) -{ - struct ptlrpc_cb_id *cbid = ev->md.user_ptr; - struct ptlrpc_reply_state *rs = cbid->cbid_arg; - struct ptlrpc_service_part *svcpt = rs->rs_svcpt; - - LASSERT(ev->type == LNET_EVENT_SEND || - ev->type == LNET_EVENT_ACK || - ev->type == LNET_EVENT_UNLINK); - - if (!rs->rs_difficult) { - /* 'Easy' replies have no further processing so I drop the - * net's ref on 'rs' - */ - LASSERT(ev->unlinked); - ptlrpc_rs_decref(rs); - return; - } - - LASSERT(rs->rs_on_net); - - if (ev->unlinked) { - /* Last network callback. The net's ref on 'rs' stays put - * until ptlrpc_handle_rs() is done with it - */ - spin_lock(&svcpt->scp_rep_lock); - spin_lock(&rs->rs_lock); - - rs->rs_on_net = 0; - if (!rs->rs_no_ack || - rs->rs_transno <= - rs->rs_export->exp_obd->obd_last_committed || - list_empty(&rs->rs_obd_list)) - ptlrpc_schedule_difficult_reply(rs); - - spin_unlock(&rs->rs_lock); - spin_unlock(&svcpt->scp_rep_lock); - } -} - -static void ptlrpc_master_callback(struct lnet_event *ev) -{ - struct ptlrpc_cb_id *cbid = ev->md.user_ptr; - void (*callback)(struct lnet_event *ev) = cbid->cbid_fn; - - /* Honestly, it's best to find out early. */ - LASSERT(cbid->cbid_arg != LP_POISON); - LASSERT(callback == request_out_callback || - callback == reply_in_callback || - callback == client_bulk_callback || - callback == request_in_callback || - callback == reply_out_callback); - - callback(ev); -} - -int ptlrpc_uuid_to_peer(struct obd_uuid *uuid, - struct lnet_process_id *peer, lnet_nid_t *self) -{ - int best_dist = 0; - __u32 best_order = 0; - int count = 0; - int rc = -ENOENT; - int dist; - __u32 order; - lnet_nid_t dst_nid; - lnet_nid_t src_nid; - - peer->pid = LNET_PID_LUSTRE; - - /* Choose the matching UUID that's closest */ - while (lustre_uuid_to_peer(uuid->uuid, &dst_nid, count++) == 0) { - dist = LNetDist(dst_nid, &src_nid, &order); - if (dist < 0) - continue; - - if (dist == 0) { /* local! use loopback LND */ - peer->nid = *self = LNET_MKNID(LNET_MKNET(LOLND, 0), 0); - rc = 0; - break; - } - - if (rc < 0 || - dist < best_dist || - (dist == best_dist && order < best_order)) { - best_dist = dist; - best_order = order; - - peer->nid = dst_nid; - *self = src_nid; - rc = 0; - } - } - - CDEBUG(D_NET, "%s->%s\n", uuid->uuid, libcfs_id2str(*peer)); - return rc; -} - -static void ptlrpc_ni_fini(void) -{ - int rc; - int retries; - - /* Wait for the event queue to become idle since there may still be - * messages in flight with pending events (i.e. the fire-and-forget - * messages == client requests and "non-difficult" server - * replies - */ - - for (retries = 0;; retries++) { - rc = LNetEQFree(ptlrpc_eq_h); - switch (rc) { - default: - LBUG(); - - case 0: - LNetNIFini(); - return; - - case -EBUSY: - if (retries != 0) - CWARN("Event queue still busy\n"); - - schedule_timeout_uninterruptible(2 * HZ); - break; - } - } - /* notreached */ -} - -static lnet_pid_t ptl_get_pid(void) -{ - lnet_pid_t pid; - - pid = LNET_PID_LUSTRE; - return pid; -} - -static int ptlrpc_ni_init(void) -{ - int rc; - lnet_pid_t pid; - - pid = ptl_get_pid(); - CDEBUG(D_NET, "My pid is: %x\n", pid); - - /* We're not passing any limits yet... */ - rc = LNetNIInit(pid); - if (rc < 0) { - CDEBUG(D_NET, "Can't init network interface: %d\n", rc); - return rc; - } - - /* CAVEAT EMPTOR: how we process portals events is _radically_ - * different depending on... - */ - /* kernel LNet calls our master callback when there are new event, - * because we are guaranteed to get every event via callback, - * so we just set EQ size to 0 to avoid overhead of serializing - * enqueue/dequeue operations in LNet. - */ - rc = LNetEQAlloc(0, ptlrpc_master_callback, &ptlrpc_eq_h); - if (rc == 0) - return 0; - - CERROR("Failed to allocate event queue: %d\n", rc); - LNetNIFini(); - - return rc; -} - -int ptlrpc_init_portals(void) -{ - int rc = ptlrpc_ni_init(); - - if (rc != 0) { - CERROR("network initialisation failed\n"); - return rc; - } - rc = ptlrpcd_addref(); - if (rc == 0) - return 0; - - CERROR("rpcd initialisation failed\n"); - ptlrpc_ni_fini(); - return rc; -} - -void ptlrpc_exit_portals(void) -{ - ptlrpcd_decref(); - ptlrpc_ni_fini(); -} |