示例#1
0
文件: niobuf.c 项目: AK101111/linux
/**
 * 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 lnet_process_id_t match_id = {LNET_NID_ANY, LNET_PID_ANY};
	int rc;
	lnet_md_t md;
	lnet_handle_me_t 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;
}
示例#2
0
文件: niobuf.c 项目: a2hojsjsjs/linux
/**
 * 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 ptlrpc_connection *connection;
	lnet_handle_me_t reply_me_h;
	lnet_md_t reply_md;
	struct obd_device *obd = request->rq_import->imp_obd;

	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) &&
		(request->rq_import->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 = request->rq_import->imp_connection;

	lustre_msg_set_handle(request->rq_reqmsg,
			      &request->rq_import->imp_remote_handle);
	lustre_msg_set_type(request->rq_reqmsg, PTL_RPC_MSG_REQUEST);
	lustre_msg_set_conn_cnt(request->rq_reqmsg,
				request->rq_import->imp_conn_cnt);
	lustre_msghdr_set_flags(request->rq_reqmsg,
				request->rq_import->imp_msghdr_flags);

	if (request->rq_resend)
		lustre_msg_add_flags(request->rq_reqmsg, MSG_RESENT);

	if (request->rq_memalloc)
		mpflag = cfs_memory_pressure_get_and_set();

	rc = sptlrpc_cli_wrap_request(request);
	if (rc)
		goto out;

	/* bulk register should be done after wrap_request() */
	if (request->rq_bulk != NULL) {
		rc = ptlrpc_register_bulk(request);
		if (rc != 0)
			goto out;
	}

	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;
			}
		} 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);
			rc = -ENOMEM;
			goto cleanup_bulk;
		}
	}

	spin_lock(&request->rq_lock);
	/* If the MD attach succeeds, there _will_ be a reply_in callback */
	request->rq_receiving_reply = !noreply;
	request->rq_req_unlink = 1;
	/* We are responsible for unlinking the reply buffer */
	request->rq_reply_unlink = !noreply;
	/* Clear any flags that may be present from previous sends. */
	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_truncate = 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 unset rq_reply_unlink,
		   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);
			rc = -ENOMEM;
			goto cleanup_me;
		}

		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(&request->rq_import->imp_inflight));

	OBD_FAIL_TIMEOUT(OBD_FAIL_PTLRPC_DELAY_SEND, request->rq_timeout + 5);

	ktime_get_real_ts64(&request->rq_arrival_time);
	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(request->rq_import);

	DEBUG_REQ(D_INFO, request, "send flg=%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,
			  connection,
			  request->rq_request_portal,
			  request->rq_xid, 0);
	if (rc == 0)
		goto out;

	ptlrpc_req_finished(request);
	if (noreply)
		goto out;

 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 (request->rq_memalloc)
		cfs_memory_pressure_restore(mpflag);
	return rc;
}
示例#3
0
文件: niobuf.c 项目: a2hojsjsjs/linux
/**
 * Register bulk at the sender for later transfer.
 * Returns 0 on success or error code.
 */
static int ptlrpc_register_bulk(struct ptlrpc_request *req)
{
	struct ptlrpc_bulk_desc *desc = req->rq_bulk;
	lnet_process_id_t peer;
	int rc = 0;
	int rc2;
	int posted_md;
	int total_md;
	__u64 xid;
	lnet_handle_me_t me_h;
	lnet_md_t md;

	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(desc->bd_type == BULK_PUT_SINK ||
		desc->bd_type == BULK_GET_SOURCE);

	/* 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
		LASSERT(desc->bd_nob_transferred == 0);

	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);

	/* An XID is only used for a single request from the client.
	 * For retried bulk transfers, a new XID will be allocated in
	 * in ptlrpc_check_set() if it needs to be resent, so it is not
	 * using the same RDMA match bits after an error.
	 *
	 * For multi-bulk RPCs, rq_xid is the last XID needed for bulks. The
	 * first bulk XID is power-of-two aligned before rq_xid. LU-1431 */
	xid = req->rq_xid & ~((__u64)desc->bd_md_max_brw - 1);
	LASSERTF(!(desc->bd_registered &&
		   req->rq_send_state != LUSTRE_IMP_REPLAY) ||
		 xid != desc->bd_last_xid,
		 "registered: %d  rq_xid: %llu bd_last_xid: %llu\n",
		 desc->bd_registered, xid, desc->bd_last_xid);

	total_md = (desc->bd_iov_count + LNET_MAX_IOV - 1) / LNET_MAX_IOV;
	desc->bd_registered = 1;
	desc->bd_last_xid = xid;
	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++, xid++) {
		md.options = PTLRPC_MD_OPTIONS |
			     ((desc->bd_type == BULK_GET_SOURCE) ?
			      LNET_MD_OP_GET : LNET_MD_OP_PUT);
		ptlrpc_fill_bulk_md(&md, desc, posted_md);

		rc = LNetMEAttach(desc->bd_portal, peer, xid, 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, xid,
			       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, xid,
			       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;
		return -ENOMEM;
	}

	/* Set rq_xid to matchbits of the final bulk so that server can
	 * infer the number of bulks that were prepared */
	req->rq_xid = --xid;
	LASSERTF(desc->bd_last_xid == (req->rq_xid & PTLRPC_BULK_OPS_MASK),
		 "bd_last_xid = x%llu, rq_xid = x%llu\n",
		 desc->bd_last_xid, req->rq_xid);

	spin_lock(&desc->bd_lock);
	/* Holler if peer manages to touch buffers before he knows the xid */
	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, xid x%#llx-%#llx, portal %u\n",
	       desc->bd_md_count,
	       desc->bd_type == BULK_GET_SOURCE ? "get-source" : "put-sink",
	       desc->bd_iov_count, desc->bd_nob,
	       desc->bd_last_xid, req->rq_xid, desc->bd_portal);

	return 0;
}
示例#4
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 ptlrpc_connection *connection;
        lnet_handle_me_t  reply_me_h;
        lnet_md_t         reply_md;
	struct obd_import *imp = request->rq_import;
	struct obd_device *obd = imp->imp_obd;
        ENTRY;

        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);
		request->rq_mbits = request->rq_xid;
		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");
	} else 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: "LPU64", replied: "LPU64", "
			  "list_empty:%d\n", 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 == -ENOMEM)
		/* set rq_sent so that this request is treated
		 * as a delayed send in the upper layers */
		request->rq_sent = cfs_time_current_sec();
	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(out, rc);
        }

        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 "LPU64
                       ", 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);

	do_gettimeofday(&request->rq_sent_tv);
	request->rq_sent = cfs_time_current_sec();
	/* 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 flg=%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,
                          connection,
                          request->rq_request_portal,
                          request->rq_xid, 0);
	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 (request->rq_memalloc)
                cfs_memory_pressure_restore(mpflag);
        return rc;
}
示例#5
0
/**
 * 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;
	lnet_process_id_t peer;
	int rc = 0;
	int rc2;
	int posted_md;
	int total_md;
	__u64 mbits;
	lnet_handle_me_t  me_h;
	lnet_md_t         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
		LASSERT(desc->bd_nob_transferred == 0);

	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"LPU64", last mbits = x"LPU64"\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: "LPU64" bd_last_mbits: "LPU64"\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);

		rc = LNetMEAttach(desc->bd_portal, peer, mbits, 0,
				  LNET_UNLINK, LNET_INS_AFTER, &me_h);
		if (rc != 0) {
			CERROR("%s: LNetMEAttach failed x"LPU64"/%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"LPU64"/%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;
		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"LPX64"-"LPX64", 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);
}