--- /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) 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/linux/libcfs/libcfs.h"
+# ifdef __mips64__
+# include <linux/kernel.h>
+# endif
+
+#include "../include/obd_class.h"
+#include "../include/lustre_net.h"
+#include "../include/lustre_sec.h"
+#include "ptlrpc_internal.h"
+
+lnet_handle_eq_t ptlrpc_eq_h;
+
+/*
+ * Client's outgoing request callback
+ */
+void request_out_callback(lnet_event_t *ev)
+{
+ struct ptlrpc_cb_id *cbid = ev->md.user_ptr;
+ struct ptlrpc_request *req = cbid->cbid_arg;
+
+ 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 = get_seconds();
+ if (ev->unlinked)
+ req->rq_req_unlink = 0;
+
+ 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;
+ ptlrpc_client_wake_req(req);
+ }
+ spin_unlock(&req->rq_lock);
+
+ ptlrpc_req_finished(req);
+}
+
+/*
+ * Client's incoming reply callback
+ */
+void reply_in_callback(lnet_event_t *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_unlink = 0;
+
+ 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_truncate = 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 */
+
+ if (req->rq_replied) /* already got the real reply */
+ 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 = get_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(lnet_event_t *ev)
+{
+ struct ptlrpc_cb_id *cbid = ev->md.user_ptr;
+ struct ptlrpc_bulk_desc *desc = cbid->cbid_arg;
+ struct ptlrpc_request *req;
+
+ LASSERT((desc->bd_type == BULK_PUT_SINK &&
+ ev->type == LNET_EVENT_PUT) ||
+ (desc->bd_type == BULK_GET_SOURCE &&
+ 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_usec >> 4; /* 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 += (1U << 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(lnet_event_t *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 == NULL) {
+ CERROR("Can't allocate incoming request descriptor: Dropping %s RPC from %s\n",
+ service->srv_name,
+ libcfs_id2str(ev->initiator));
+ return;
+ }
+ }
+
+ /* 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;
+ do_gettimeofday(&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;
+ spin_lock_init(&req->rq_lock);
+ INIT_LIST_HEAD(&req->rq_timed_list);
+ INIT_LIST_HEAD(&req->rq_exp_list);
+ atomic_set(&req->rq_refcount, 1);
+ 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(lnet_event_t *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)
+ ptlrpc_schedule_difficult_reply(rs);
+
+ spin_unlock(&rs->rs_lock);
+ spin_unlock(&svcpt->scp_rep_lock);
+ }
+}
+
+
+static void ptlrpc_master_callback(lnet_event_t *ev)
+{
+ struct ptlrpc_cb_id *cbid = ev->md.user_ptr;
+ void (*callback)(lnet_event_t *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,
+ lnet_process_id_t *peer, lnet_nid_t *self)
+{
+ int best_dist = 0;
+ __u32 best_order = 0;
+ int count = 0;
+ int rc = -ENOENT;
+ int portals_compatibility;
+ int dist;
+ __u32 order;
+ lnet_nid_t dst_nid;
+ lnet_nid_t src_nid;
+
+ portals_compatibility = LNetCtl(IOC_LIBCFS_PORTALS_COMPATIBILITY, NULL);
+
+ peer->pid = LUSTRE_SRV_LNET_PID;
+
+ /* 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;
+
+ if (portals_compatibility > 1) {
+ /* Strong portals compatibility: Zero the nid's
+ * NET, so if I'm reading new config logs, or
+ * getting configured by (new) lconf I can
+ * still talk to old servers. */
+ dst_nid = LNET_MKNID(0, LNET_NIDADDR(dst_nid));
+ src_nid = LNET_MKNID(0, LNET_NIDADDR(src_nid));
+ }
+ peer->nid = dst_nid;
+ *self = src_nid;
+ rc = 0;
+ }
+ }
+
+ CDEBUG(D_NET, "%s->%s\n", uuid->uuid, libcfs_id2str(*peer));
+ return rc;
+}
+
+void ptlrpc_ni_fini(void)
+{
+ wait_queue_head_t waitq;
+ struct l_wait_info lwi;
+ 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");
+
+ /* Wait for a bit */
+ init_waitqueue_head(&waitq);
+ lwi = LWI_TIMEOUT(cfs_time_seconds(2), NULL, NULL);
+ l_wait_event(waitq, 0, &lwi);
+ break;
+ }
+ }
+ /* notreached */
+}
+
+lnet_pid_t ptl_get_pid(void)
+{
+ lnet_pid_t pid;
+
+ pid = LUSTRE_SRV_LNET_PID;
+ return pid;
+}
+
+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 -ENOENT;
+ }
+
+ /* 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 -ENOMEM;
+}
+
+
+int ptlrpc_init_portals(void)
+{
+ int rc = ptlrpc_ni_init();
+
+ if (rc != 0) {
+ CERROR("network initialisation failed\n");
+ return -EIO;
+ }
+ 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();
+}
Code Review / kvmfornfv.git / blobdiff