/* * 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, 2017, 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 #include #include #include #include "ptlrpc_internal.h" #include /* for CFS_FAIL_PTLRPC_OST_BULK_CB2 */ /** * Helper function. Sends \a len bytes from \a base at offset \a offset * over \a conn connection to portal \a portal. * Returns 0 on success or error code. */ static int ptl_send_buf(struct lnet_handle_md *mdh, void *base, int len, enum lnet_ack_req ack, struct ptlrpc_cb_id *cbid, lnet_nid_t self, struct lnet_process_id peer_id, int portal, __u64 xid, unsigned int offset, struct lnet_handle_md *bulk_cookie) { int rc; struct lnet_md md; ENTRY; LASSERT (portal != 0); CDEBUG (D_INFO, "peer_id %s\n", libcfs_id2str(peer_id)); md.start = base; md.length = len; md.threshold = (ack == LNET_ACK_REQ) ? 2 : 1; md.options = PTLRPC_MD_OPTIONS; md.user_ptr = cbid; md.eq_handle = ptlrpc_eq_h; LNetInvalidateMDHandle(&md.bulk_handle); if (bulk_cookie) { md.bulk_handle = *bulk_cookie; md.options |= LNET_MD_BULK_HANDLE; } if (unlikely(ack == LNET_ACK_REQ && OBD_FAIL_CHECK_ORSET(OBD_FAIL_PTLRPC_ACK, OBD_FAIL_ONCE))){ /* don't ask for the ack to simulate failing client */ ack = LNET_NOACK_REQ; } rc = LNetMDBind (md, LNET_UNLINK, mdh); if (unlikely(rc != 0)) { CERROR ("LNetMDBind failed: %d\n", rc); LASSERT (rc == -ENOMEM); RETURN (-ENOMEM); } CDEBUG(D_NET, "Sending %d bytes to portal %d, xid %lld, offset %u\n", len, portal, xid, offset); rc = LNetPut(self, *mdh, ack, peer_id, portal, xid, offset, 0); if (unlikely(rc != 0)) { int rc2; /* We're going to get an UNLINK event when I unlink below, * which will complete just like any other failed send, so * I fall through and return success here! */ CERROR("LNetPut(%s, %d, %lld) failed: %d\n", libcfs_id2str(peer_id), portal, xid, rc); rc2 = LNetMDUnlink(*mdh); LASSERTF(rc2 == 0, "rc2 = %d\n", rc2); } RETURN (0); } static void mdunlink_iterate_helper(struct lnet_handle_md *bd_mds, int count) { int i; for (i = 0; i < count; i++) LNetMDUnlink(bd_mds[i]); } #ifdef HAVE_SERVER_SUPPORT /** * Prepare bulk descriptor for specified incoming request \a req that * can fit \a nfrags * pages. \a type is bulk type. \a portal is where * the bulk to be sent. Used on server-side after request was already * received. * Returns pointer to newly allocatrd initialized bulk descriptor or NULL on * error. */ struct ptlrpc_bulk_desc *ptlrpc_prep_bulk_exp(struct ptlrpc_request *req, unsigned nfrags, unsigned max_brw, unsigned int type, unsigned portal, const struct ptlrpc_bulk_frag_ops *ops) { struct obd_export *exp = req->rq_export; struct ptlrpc_bulk_desc *desc; ENTRY; LASSERT(ptlrpc_is_bulk_op_active(type)); desc = ptlrpc_new_bulk(nfrags, max_brw, type, portal, ops); if (desc == NULL) RETURN(NULL); desc->bd_export = class_export_get(exp); desc->bd_req = req; desc->bd_cbid.cbid_fn = server_bulk_callback; desc->bd_cbid.cbid_arg = desc; /* NB we don't assign rq_bulk here; server-side requests are * re-used, and the handler frees the bulk desc explicitly. */ return desc; } EXPORT_SYMBOL(ptlrpc_prep_bulk_exp); /** * Starts bulk transfer for descriptor \a desc on the server. * Returns 0 on success or error code. */ int ptlrpc_start_bulk_transfer(struct ptlrpc_bulk_desc *desc) { struct obd_export *exp = desc->bd_export; lnet_nid_t self_nid; struct lnet_process_id peer_id; int rc = 0; __u64 mbits; int posted_md; int total_md; struct lnet_md md; ENTRY; if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_BULK_PUT_NET)) RETURN(0); /* NB no locking required until desc is on the network */ LASSERT(desc->bd_md_count == 0); LASSERT(ptlrpc_is_bulk_op_active(desc->bd_type)); LASSERT(desc->bd_cbid.cbid_fn == server_bulk_callback); LASSERT(desc->bd_cbid.cbid_arg == desc); /* * Multi-Rail: get the preferred self and peer NIDs from the * request, so they are based on the route taken by the * message. */ self_nid = desc->bd_req->rq_self; peer_id = desc->bd_req->rq_source; /* NB total length may be 0 for a read past EOF, so we send 0 * length bulks, since the client expects bulk events. * * The client may not need all of the bulk mbits for the RPC. The RPC * used the mbits of the highest bulk mbits needed, and the server masks * off high bits to get bulk count for this RPC. LU-1431 */ mbits = desc->bd_req->rq_mbits & ~((__u64)desc->bd_md_max_brw - 1); total_md = desc->bd_req->rq_mbits - mbits + 1; desc->bd_md_count = total_md; desc->bd_failure = 0; md.user_ptr = &desc->bd_cbid; md.eq_handle = ptlrpc_eq_h; md.threshold = 2; /* SENT and ACK/REPLY */ for (posted_md = 0; posted_md < total_md; mbits++) { md.options = PTLRPC_MD_OPTIONS; /* NB it's assumed that source and sink buffer frags are * page-aligned. Otherwise we'd have to send client bulk * sizes over and split server buffer accordingly */ ptlrpc_fill_bulk_md(&md, desc, posted_md); rc = LNetMDBind(md, LNET_UNLINK, &desc->bd_mds[posted_md]); if (rc != 0) { CERROR("%s: LNetMDBind failed for MD %u: rc = %d\n", exp->exp_obd->obd_name, posted_md, rc); LASSERT(rc == -ENOMEM); if (posted_md == 0) { desc->bd_md_count = 0; RETURN(-ENOMEM); } break; } /* sanity.sh 224c: lets skip last md */ if (posted_md == desc->bd_md_max_brw - 1) OBD_FAIL_CHECK_RESET(OBD_FAIL_PTLRPC_CLIENT_BULK_CB3, CFS_FAIL_PTLRPC_OST_BULK_CB2); /* Network is about to get at the memory */ if (ptlrpc_is_bulk_put_source(desc->bd_type)) rc = LNetPut(self_nid, desc->bd_mds[posted_md], LNET_ACK_REQ, peer_id, desc->bd_portal, mbits, 0, 0); else rc = LNetGet(self_nid, desc->bd_mds[posted_md], peer_id, desc->bd_portal, mbits, 0, false); posted_md++; if (rc != 0) { CERROR("%s: failed bulk transfer with %s:%u x%llu: " "rc = %d\n", exp->exp_obd->obd_name, libcfs_id2str(peer_id), desc->bd_portal, mbits, rc); break; } } if (rc != 0) { /* Can't send, so we unlink the MD bound above. The UNLINK * event this creates will signal completion with failure, * so we return SUCCESS here! */ spin_lock(&desc->bd_lock); desc->bd_md_count -= total_md - posted_md; spin_unlock(&desc->bd_lock); LASSERT(desc->bd_md_count >= 0); mdunlink_iterate_helper(desc->bd_mds, posted_md); RETURN(0); } CDEBUG(D_NET, "Transferring %u pages %u bytes via portal %d " "id %s mbits %#llx-%#llx\n", desc->bd_iov_count, desc->bd_nob, desc->bd_portal, libcfs_id2str(peer_id), mbits - posted_md, mbits - 1); RETURN(0); } /** * Server side bulk abort. Idempotent. Not thread-safe (i.e. only * serialises with completion callback) */ void ptlrpc_abort_bulk(struct ptlrpc_bulk_desc *desc) { struct l_wait_info lwi; int rc; LASSERT(!in_interrupt()); /* might sleep */ if (!ptlrpc_server_bulk_active(desc)) /* completed or */ return; /* never started */ /* We used to poison the pages with 0xab here because we did not want to * send any meaningful data over the wire for evicted clients (bug 9297) * However, this is no longer safe now that we use the page cache on the * OSS (bug 20560) */ /* The unlink ensures the callback happens ASAP and is the last * one. If it fails, it must be because completion just happened, * but we must still l_wait_event() in this case, to give liblustre * a chance to run server_bulk_callback()*/ mdunlink_iterate_helper(desc->bd_mds, desc->bd_md_max_brw); for (;;) { /* 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(desc->bd_waitq, !ptlrpc_server_bulk_active(desc), &lwi); if (rc == 0) return; LASSERT(rc == -ETIMEDOUT); CWARN("Unexpectedly long timeout: desc %p\n", desc); } } #endif /* HAVE_SERVER_SUPPORT */ /** * Register bulk at the sender for later transfer. * Returns 0 on success or error code. */ int ptlrpc_register_bulk(struct ptlrpc_request *req) { struct ptlrpc_bulk_desc *desc = req->rq_bulk; struct lnet_process_id peer; int rc = 0; int rc2; int posted_md; int total_md; __u64 mbits; struct lnet_handle_me me_h; struct lnet_md md; ENTRY; if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_BULK_GET_NET)) RETURN(0); /* NB no locking required until desc is on the network */ LASSERT(desc->bd_nob > 0); LASSERT(desc->bd_md_count == 0); LASSERT(desc->bd_md_max_brw <= PTLRPC_BULK_OPS_COUNT); LASSERT(desc->bd_iov_count <= PTLRPC_MAX_BRW_PAGES); LASSERT(desc->bd_req != NULL); LASSERT(ptlrpc_is_bulk_op_passive(desc->bd_type)); /* cleanup the state of the bulk for it will be reused */ if (req->rq_resend || req->rq_send_state == LUSTRE_IMP_REPLAY) desc->bd_nob_transferred = 0; else if (desc->bd_nob_transferred != 0) /* If the network failed after an RPC was sent, this condition * could happen. Rather than assert (was here before), return * an EIO error. */ RETURN(-EIO); desc->bd_failure = 0; peer = desc->bd_import->imp_connection->c_peer; LASSERT(desc->bd_cbid.cbid_fn == client_bulk_callback); LASSERT(desc->bd_cbid.cbid_arg == desc); total_md = (desc->bd_iov_count + LNET_MAX_IOV - 1) / LNET_MAX_IOV; /* rq_mbits is matchbits of the final bulk */ mbits = req->rq_mbits - total_md + 1; LASSERTF(mbits == (req->rq_mbits & PTLRPC_BULK_OPS_MASK), "first mbits = x%llu, last mbits = x%llu\n", mbits, req->rq_mbits); LASSERTF(!(desc->bd_registered && req->rq_send_state != LUSTRE_IMP_REPLAY) || mbits != desc->bd_last_mbits, "registered: %d rq_mbits: %llu bd_last_mbits: %llu\n", desc->bd_registered, mbits, desc->bd_last_mbits); desc->bd_registered = 1; desc->bd_last_mbits = mbits; desc->bd_md_count = total_md; md.user_ptr = &desc->bd_cbid; md.eq_handle = ptlrpc_eq_h; md.threshold = 1; /* PUT or GET */ for (posted_md = 0; posted_md < total_md; posted_md++, mbits++) { md.options = PTLRPC_MD_OPTIONS | (ptlrpc_is_bulk_op_get(desc->bd_type) ? LNET_MD_OP_GET : LNET_MD_OP_PUT); ptlrpc_fill_bulk_md(&md, desc, posted_md); if (posted_md > 0 && posted_md + 1 == total_md && OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_BULK_ATTACH)) { rc = -ENOMEM; } else { rc = LNetMEAttach(desc->bd_portal, peer, mbits, 0, LNET_UNLINK, LNET_INS_AFTER, &me_h); } if (rc != 0) { CERROR("%s: LNetMEAttach failed x%llu/%d: rc = %d\n", desc->bd_import->imp_obd->obd_name, mbits, posted_md, rc); break; } /* About to let the network at it... */ rc = LNetMDAttach(me_h, md, LNET_UNLINK, &desc->bd_mds[posted_md]); if (rc != 0) { CERROR("%s: LNetMDAttach failed x%llu/%d: rc = %d\n", desc->bd_import->imp_obd->obd_name, mbits, posted_md, rc); rc2 = LNetMEUnlink(me_h); LASSERT(rc2 == 0); break; } } if (rc != 0) { LASSERT(rc == -ENOMEM); spin_lock(&desc->bd_lock); desc->bd_md_count -= total_md - posted_md; spin_unlock(&desc->bd_lock); LASSERT(desc->bd_md_count >= 0); mdunlink_iterate_helper(desc->bd_mds, desc->bd_md_max_brw); req->rq_status = -ENOMEM; desc->bd_registered = 0; RETURN(-ENOMEM); } spin_lock(&desc->bd_lock); /* Holler if peer manages to touch buffers before he knows the mbits */ if (desc->bd_md_count != total_md) CWARN("%s: Peer %s touched %d buffers while I registered\n", desc->bd_import->imp_obd->obd_name, libcfs_id2str(peer), total_md - desc->bd_md_count); spin_unlock(&desc->bd_lock); CDEBUG(D_NET, "Setup %u bulk %s buffers: %u pages %u bytes, " "mbits x%#llx-%#llx, portal %u\n", desc->bd_md_count, ptlrpc_is_bulk_op_get(desc->bd_type) ? "get-source" : "put-sink", desc->bd_iov_count, desc->bd_nob, desc->bd_last_mbits, req->rq_mbits, desc->bd_portal); RETURN(0); } /** * Disconnect a bulk desc from the network. Idempotent. Not * thread-safe (i.e. only interlocks with completion callback). * Returns 1 on success or 0 if network unregistration failed for whatever * reason. */ int ptlrpc_unregister_bulk(struct ptlrpc_request *req, int async) { struct ptlrpc_bulk_desc *desc = req->rq_bulk; struct l_wait_info lwi; int rc; ENTRY; LASSERT(!in_interrupt()); /* might sleep */ /* Let's setup deadline for reply unlink. */ if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_LONG_BULK_UNLINK) && async && req->rq_bulk_deadline == 0 && cfs_fail_val == 0) req->rq_bulk_deadline = ktime_get_real_seconds() + LONG_UNLINK; if (ptlrpc_client_bulk_active(req) == 0) /* completed or */ RETURN(1); /* never registered */ LASSERT(desc->bd_req == req); /* bd_req NULL until registered */ /* the unlink ensures the callback happens ASAP and is the last * one. If it fails, it must be because completion just happened, * but we must still l_wait_event() in this case to give liblustre * a chance to run client_bulk_callback() */ mdunlink_iterate_helper(desc->bd_mds, desc->bd_md_max_brw); if (ptlrpc_client_bulk_active(req) == 0) /* completed or */ RETURN(1); /* never registered */ /* Move to "Unregistering" phase as bulk was not unlinked yet. */ ptlrpc_rqphase_move(req, RQ_PHASE_UNREG_BULK); /* Do not wait for unlink to finish. */ if (async) RETURN(0); for (;;) { /* The wq argument is ignored by user-space wait_event macros */ wait_queue_head_t *wq = (req->rq_set != NULL) ? &req->rq_set->set_waitq : &req->rq_reply_waitq; /* * 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(*wq, !ptlrpc_client_bulk_active(req), &lwi); if (rc == 0) { ptlrpc_rqphase_move(req, req->rq_next_phase); RETURN(1); } LASSERT(rc == -ETIMEDOUT); DEBUG_REQ(D_WARNING, req, "Unexpectedly long timeout: desc %p", desc); } RETURN(0); } static void ptlrpc_at_set_reply(struct ptlrpc_request *req, int flags) { struct ptlrpc_service_part *svcpt = req->rq_rqbd->rqbd_svcpt; struct ptlrpc_service *svc = svcpt->scp_service; int service_time = max_t(int, ktime_get_real_seconds() - req->rq_arrival_time.tv_sec, 1); if (!(flags & PTLRPC_REPLY_EARLY) && (req->rq_type != PTL_RPC_MSG_ERR) && (req->rq_reqmsg != NULL) && !(lustre_msg_get_flags(req->rq_reqmsg) & (MSG_RESENT | MSG_REPLAY | MSG_REQ_REPLAY_DONE | MSG_LOCK_REPLAY_DONE))) { /* early replies, errors and recovery requests don't count * toward our service time estimate */ int oldse = at_measured(&svcpt->scp_at_estimate, service_time); if (oldse != 0) { DEBUG_REQ(D_ADAPTTO, req, "svc %s changed estimate from %d to %d", svc->srv_name, oldse, at_get(&svcpt->scp_at_estimate)); } } /* Report actual service time for client latency calc */ lustre_msg_set_service_time(req->rq_repmsg, service_time); /* Report service time estimate for future client reqs, but report 0 * (to be ignored by client) if it's an error reply during recovery. * b=15815 */ if (req->rq_type == PTL_RPC_MSG_ERR && (req->rq_export == NULL || req->rq_export->exp_obd->obd_recovering)) { lustre_msg_set_timeout(req->rq_repmsg, 0); } else { time64_t timeout; if (req->rq_export && req->rq_reqmsg != NULL && (flags & PTLRPC_REPLY_EARLY) && lustre_msg_get_flags(req->rq_reqmsg) & (MSG_REPLAY | MSG_REQ_REPLAY_DONE | MSG_LOCK_REPLAY_DONE)) { struct obd_device *exp_obd = req->rq_export->exp_obd; timeout = ktime_get_real_seconds() - req->rq_arrival_time.tv_sec + min_t(time64_t, at_extra, exp_obd->obd_recovery_timeout / 4); } else { timeout = at_get(&svcpt->scp_at_estimate); } lustre_msg_set_timeout(req->rq_repmsg, timeout); } if (req->rq_reqmsg && !(lustre_msghdr_get_flags(req->rq_reqmsg) & MSGHDR_AT_SUPPORT)) { CDEBUG(D_ADAPTTO, "No early reply support: flags=%#x " "req_flags=%#x magic=%x/%x len=%d\n", flags, lustre_msg_get_flags(req->rq_reqmsg), lustre_msg_get_magic(req->rq_reqmsg), lustre_msg_get_magic(req->rq_repmsg), req->rq_replen); } } /** * Send request reply from request \a req reply buffer. * \a flags defines reply types * Returns 0 on success or error code */ int ptlrpc_send_reply(struct ptlrpc_request *req, int flags) { struct ptlrpc_reply_state *rs = req->rq_reply_state; struct ptlrpc_connection *conn; int rc; /* We must already have a reply buffer (only ptlrpc_error() may be * called without one). The reply generated by sptlrpc layer (e.g. * error notify, etc.) might have NULL rq->reqmsg; Otherwise we must * have a request buffer which is either the actual (swabbed) incoming * request, or a saved copy if this is a req saved in * target_queue_final_reply(). */ LASSERT (req->rq_no_reply == 0); LASSERT (req->rq_reqbuf != NULL); LASSERT (rs != NULL); LASSERT ((flags & PTLRPC_REPLY_MAYBE_DIFFICULT) || !rs->rs_difficult); LASSERT (req->rq_repmsg != NULL); LASSERT (req->rq_repmsg == rs->rs_msg); LASSERT (rs->rs_cb_id.cbid_fn == reply_out_callback); LASSERT (rs->rs_cb_id.cbid_arg == rs); /* There may be no rq_export during failover */ if (unlikely(req->rq_export && req->rq_export->exp_obd && req->rq_export->exp_obd->obd_fail)) { /* Failed obd's only send ENODEV */ req->rq_type = PTL_RPC_MSG_ERR; req->rq_status = -ENODEV; CDEBUG(D_HA, "sending ENODEV from failed obd %d\n", req->rq_export->exp_obd->obd_minor); } if (req->rq_type != PTL_RPC_MSG_ERR) req->rq_type = PTL_RPC_MSG_REPLY; lustre_msg_set_type(req->rq_repmsg, req->rq_type); lustre_msg_set_status(req->rq_repmsg, ptlrpc_status_hton(req->rq_status)); lustre_msg_set_opc(req->rq_repmsg, req->rq_reqmsg ? lustre_msg_get_opc(req->rq_reqmsg) : 0); target_pack_pool_reply(req); ptlrpc_at_set_reply(req, flags); if (req->rq_export == NULL || req->rq_export->exp_connection == NULL) conn = ptlrpc_connection_get(req->rq_peer, req->rq_self, NULL); else conn = ptlrpc_connection_addref(req->rq_export->exp_connection); if (unlikely(conn == NULL)) { CERROR("not replying on NULL connection\n"); /* bug 9635 */ return -ENOTCONN; } ptlrpc_rs_addref(rs); /* +1 ref for the network */ rc = sptlrpc_svc_wrap_reply(req); if (unlikely(rc)) goto out; req->rq_sent = ktime_get_real_seconds(); rc = ptl_send_buf(&rs->rs_md_h, rs->rs_repbuf, rs->rs_repdata_len, (rs->rs_difficult && !rs->rs_no_ack) ? LNET_ACK_REQ : LNET_NOACK_REQ, &rs->rs_cb_id, req->rq_self, req->rq_source, ptlrpc_req2svc(req)->srv_rep_portal, req->rq_xid, req->rq_reply_off, NULL); out: if (unlikely(rc != 0)) ptlrpc_req_drop_rs(req); ptlrpc_connection_put(conn); return rc; } int ptlrpc_reply (struct ptlrpc_request *req) { if (req->rq_no_reply) return 0; else return (ptlrpc_send_reply(req, 0)); } /** * For request \a req send an error reply back. Create empty * reply buffers if necessary. */ int ptlrpc_send_error(struct ptlrpc_request *req, int may_be_difficult) { int rc; ENTRY; if (req->rq_no_reply) RETURN(0); if (!req->rq_repmsg) { rc = lustre_pack_reply(req, 1, NULL, NULL); if (rc) RETURN(rc); } if (req->rq_status != -ENOSPC && req->rq_status != -EACCES && req->rq_status != -EPERM && req->rq_status != -ENOENT && req->rq_status != -EINPROGRESS && req->rq_status != -EDQUOT) req->rq_type = PTL_RPC_MSG_ERR; rc = ptlrpc_send_reply(req, may_be_difficult); RETURN(rc); } int ptlrpc_error(struct ptlrpc_request *req) { return ptlrpc_send_error(req, 0); } /** * Send request \a request. * if \a noreply is set, don't expect any reply back and don't set up * reply buffers. * Returns 0 on success or error code. */ int ptl_send_rpc(struct ptlrpc_request *request, int noreply) { int rc; int rc2; int mpflag = 0; struct lnet_handle_md bulk_cookie; struct ptlrpc_connection *connection; struct lnet_handle_me reply_me_h; struct lnet_md reply_md; struct obd_import *imp = request->rq_import; struct obd_device *obd = imp->imp_obd; ENTRY; LNetInvalidateMDHandle(&bulk_cookie); if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_DROP_RPC)) RETURN(0); LASSERT(request->rq_type == PTL_RPC_MSG_REQUEST); LASSERT(request->rq_wait_ctx == 0); /* If this is a re-transmit, we're required to have disengaged * cleanly from the previous attempt */ LASSERT(!request->rq_receiving_reply); LASSERT(!((lustre_msg_get_flags(request->rq_reqmsg) & MSG_REPLAY) && (imp->imp_state == LUSTRE_IMP_FULL))); if (unlikely(obd != NULL && obd->obd_fail)) { CDEBUG(D_HA, "muting rpc for failed imp obd %s\n", obd->obd_name); /* this prevents us from waiting in ptlrpc_queue_wait */ spin_lock(&request->rq_lock); request->rq_err = 1; spin_unlock(&request->rq_lock); request->rq_status = -ENODEV; RETURN(-ENODEV); } connection = imp->imp_connection; lustre_msg_set_handle(request->rq_reqmsg, &imp->imp_remote_handle); lustre_msg_set_type(request->rq_reqmsg, PTL_RPC_MSG_REQUEST); lustre_msg_set_conn_cnt(request->rq_reqmsg, imp->imp_conn_cnt); lustre_msghdr_set_flags(request->rq_reqmsg, imp->imp_msghdr_flags); /* If it's the first time to resend the request for EINPROGRESS, * we need to allocate a new XID (see after_reply()), it's different * from the resend for reply timeout. */ if (request->rq_nr_resend != 0 && list_empty(&request->rq_unreplied_list)) { __u64 min_xid = 0; /* resend for EINPROGRESS, allocate new xid to avoid reply * reconstruction */ spin_lock(&imp->imp_lock); ptlrpc_assign_next_xid_nolock(request); min_xid = ptlrpc_known_replied_xid(imp); spin_unlock(&imp->imp_lock); lustre_msg_set_last_xid(request->rq_reqmsg, min_xid); DEBUG_REQ(D_RPCTRACE, request, "Allocating new XID for resend on EINPROGRESS"); } if (request->rq_bulk != NULL) { ptlrpc_set_bulk_mbits(request); lustre_msg_set_mbits(request->rq_reqmsg, request->rq_mbits); } if (list_empty(&request->rq_unreplied_list) || request->rq_xid <= imp->imp_known_replied_xid) { DEBUG_REQ(D_ERROR, request, "xid=%llu, replied=%llu, list_empty=%d", request->rq_xid, imp->imp_known_replied_xid, list_empty(&request->rq_unreplied_list)); LBUG(); } /** For enabled AT all request should have AT_SUPPORT in the * FULL import state when OBD_CONNECT_AT is set */ LASSERT(AT_OFF || imp->imp_state != LUSTRE_IMP_FULL || (imp->imp_msghdr_flags & MSGHDR_AT_SUPPORT) || !(imp->imp_connect_data.ocd_connect_flags & OBD_CONNECT_AT)); if (request->rq_resend) { lustre_msg_add_flags(request->rq_reqmsg, MSG_RESENT); if (request->rq_resend_cb != NULL) request->rq_resend_cb(request, &request->rq_async_args); } if (request->rq_memalloc) mpflag = cfs_memory_pressure_get_and_set(); rc = sptlrpc_cli_wrap_request(request); if (rc) GOTO(out, rc); /* bulk register should be done after wrap_request() */ if (request->rq_bulk != NULL) { rc = ptlrpc_register_bulk (request); if (rc != 0) GOTO(cleanup_bulk, rc); /* * All the mds in the request will have the same cpt * encoded in the cookie. So we can just get the first * one. */ bulk_cookie = request->rq_bulk->bd_mds[0]; } if (!noreply) { LASSERT (request->rq_replen != 0); if (request->rq_repbuf == NULL) { LASSERT(request->rq_repdata == NULL); LASSERT(request->rq_repmsg == NULL); rc = sptlrpc_cli_alloc_repbuf(request, request->rq_replen); if (rc) { /* this prevents us from looping in * ptlrpc_queue_wait */ spin_lock(&request->rq_lock); request->rq_err = 1; spin_unlock(&request->rq_lock); request->rq_status = rc; GOTO(cleanup_bulk, rc); } } else { request->rq_repdata = NULL; request->rq_repmsg = NULL; } rc = LNetMEAttach(request->rq_reply_portal,/*XXX FIXME bug 249*/ connection->c_peer, request->rq_xid, 0, LNET_UNLINK, LNET_INS_AFTER, &reply_me_h); if (rc != 0) { CERROR("LNetMEAttach failed: %d\n", rc); LASSERT (rc == -ENOMEM); GOTO(cleanup_bulk, rc = -ENOMEM); } } spin_lock(&request->rq_lock); /* We are responsible for unlinking the reply buffer */ request->rq_reply_unlinked = noreply; request->rq_receiving_reply = !noreply; /* Clear any flags that may be present from previous sends. */ request->rq_req_unlinked = 0; request->rq_replied = 0; request->rq_err = 0; request->rq_timedout = 0; request->rq_net_err = 0; request->rq_resend = 0; request->rq_restart = 0; request->rq_reply_truncated = 0; spin_unlock(&request->rq_lock); if (!noreply) { reply_md.start = request->rq_repbuf; reply_md.length = request->rq_repbuf_len; /* Allow multiple early replies */ reply_md.threshold = LNET_MD_THRESH_INF; /* Manage remote for early replies */ reply_md.options = PTLRPC_MD_OPTIONS | LNET_MD_OP_PUT | LNET_MD_MANAGE_REMOTE | LNET_MD_TRUNCATE; /* allow to make EOVERFLOW error */; reply_md.user_ptr = &request->rq_reply_cbid; reply_md.eq_handle = ptlrpc_eq_h; /* We must see the unlink callback to set rq_reply_unlinked, * so we can't auto-unlink */ rc = LNetMDAttach(reply_me_h, reply_md, LNET_RETAIN, &request->rq_reply_md_h); if (rc != 0) { CERROR("LNetMDAttach failed: %d\n", rc); LASSERT (rc == -ENOMEM); spin_lock(&request->rq_lock); /* ...but the MD attach didn't succeed... */ request->rq_receiving_reply = 0; spin_unlock(&request->rq_lock); GOTO(cleanup_me, rc = -ENOMEM); } CDEBUG(D_NET, "Setup reply buffer: %u bytes, xid %llu" ", portal %u\n", request->rq_repbuf_len, request->rq_xid, request->rq_reply_portal); } /* add references on request for request_out_callback */ ptlrpc_request_addref(request); if (obd != NULL && obd->obd_svc_stats != NULL) lprocfs_counter_add(obd->obd_svc_stats, PTLRPC_REQACTIVE_CNTR, atomic_read(&imp->imp_inflight)); OBD_FAIL_TIMEOUT(OBD_FAIL_PTLRPC_DELAY_SEND, request->rq_timeout + 5); request->rq_sent_ns = ktime_get_real(); request->rq_sent = ktime_get_real_seconds(); /* We give the server rq_timeout secs to process the req, and add the network latency for our local timeout. */ request->rq_deadline = request->rq_sent + request->rq_timeout + ptlrpc_at_get_net_latency(request); ptlrpc_pinger_sending_on_import(imp); DEBUG_REQ(D_INFO, request, "send flags=%x", lustre_msg_get_flags(request->rq_reqmsg)); rc = ptl_send_buf(&request->rq_req_md_h, request->rq_reqbuf, request->rq_reqdata_len, LNET_NOACK_REQ, &request->rq_req_cbid, LNET_NID_ANY, connection->c_peer, request->rq_request_portal, request->rq_xid, 0, &bulk_cookie); if (likely(rc == 0)) GOTO(out, rc); request->rq_req_unlinked = 1; ptlrpc_req_finished(request); if (noreply) GOTO(out, rc); cleanup_me: /* MEUnlink is safe; the PUT didn't even get off the ground, and * nobody apart from the PUT's target has the right nid+XID to * access the reply buffer. */ rc2 = LNetMEUnlink(reply_me_h); LASSERT (rc2 == 0); /* UNLINKED callback called synchronously */ LASSERT(!request->rq_receiving_reply); cleanup_bulk: /* We do sync unlink here as there was no real transfer here so * the chance to have long unlink to sluggish net is smaller here. */ ptlrpc_unregister_bulk(request, 0); out: if (rc == -ENOMEM) { /* set rq_sent so that this request is treated * as a delayed send in the upper layers */ request->rq_sent = ktime_get_real_seconds(); } if (request->rq_memalloc) cfs_memory_pressure_restore(mpflag); return rc; } EXPORT_SYMBOL(ptl_send_rpc); /** * Register request buffer descriptor for request receiving. */ int ptlrpc_register_rqbd(struct ptlrpc_request_buffer_desc *rqbd) { struct ptlrpc_service *service = rqbd->rqbd_svcpt->scp_service; static struct lnet_process_id match_id = { .nid = LNET_NID_ANY, .pid = LNET_PID_ANY }; int rc; struct lnet_md md; struct lnet_handle_me me_h; CDEBUG(D_NET, "LNetMEAttach: portal %d\n", service->srv_req_portal); if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_RQBD)) return (-ENOMEM); /* NB: CPT affinity service should use new LNet flag LNET_INS_LOCAL, * which means buffer can only be attached on local CPT, and LND * threads can find it by grabbing a local lock */ rc = LNetMEAttach(service->srv_req_portal, match_id, 0, ~0, LNET_UNLINK, rqbd->rqbd_svcpt->scp_cpt >= 0 ? LNET_INS_LOCAL : LNET_INS_AFTER, &me_h); if (rc != 0) { CERROR("LNetMEAttach failed: %d\n", rc); return (-ENOMEM); } LASSERT(rqbd->rqbd_refcount == 0); rqbd->rqbd_refcount = 1; md.start = rqbd->rqbd_buffer; md.length = service->srv_buf_size; md.max_size = service->srv_max_req_size; md.threshold = LNET_MD_THRESH_INF; md.options = PTLRPC_MD_OPTIONS | LNET_MD_OP_PUT | LNET_MD_MAX_SIZE; md.user_ptr = &rqbd->rqbd_cbid; md.eq_handle = ptlrpc_eq_h; rc = LNetMDAttach(me_h, md, LNET_UNLINK, &rqbd->rqbd_md_h); if (rc == 0) return (0); CERROR("LNetMDAttach failed: %d; \n", rc); LASSERT (rc == -ENOMEM); rc = LNetMEUnlink (me_h); LASSERT (rc == 0); rqbd->rqbd_refcount = 0; return (-ENOMEM); }