/*
 * 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) 2007, 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.
 *
 * lnet/klnds/o2iblnd/o2iblnd_cb.c
 *
 * Author: Eric Barton <eric@bartonsoftware.com>
 */

#include "o2iblnd.h"

#define MAX_CONN_RACES_BEFORE_ABORT 20

static void kiblnd_peer_alive(struct kib_peer_ni *peer_ni);
static void kiblnd_peer_connect_failed(struct kib_peer_ni *peer_ni, int active,
				       int error);
static void kiblnd_init_tx_msg(struct lnet_ni *ni, struct kib_tx *tx,
			       int type, int body_nob);
static int kiblnd_init_rdma(struct kib_conn *conn, struct kib_tx *tx, int type,
			    int resid, struct kib_rdma_desc *dstrd, u64 dstcookie);
static void kiblnd_queue_tx_locked(struct kib_tx *tx, struct kib_conn *conn);
static void kiblnd_queue_tx(struct kib_tx *tx, struct kib_conn *conn);

static void kiblnd_unmap_tx(struct kib_tx *tx);
static void kiblnd_check_sends_locked(struct kib_conn *conn);

void
kiblnd_tx_done(struct kib_tx *tx)
{
	struct lnet_msg *lntmsg[2];
	int         rc;
	int         i;

	LASSERT (!in_interrupt());
	LASSERT (!tx->tx_queued);               /* mustn't be queued for sending */
	LASSERT (tx->tx_sending == 0);          /* mustn't be awaiting sent callback */
	LASSERT (!tx->tx_waiting);              /* mustn't be awaiting peer_ni response */
	LASSERT (tx->tx_pool != NULL);

	kiblnd_unmap_tx(tx);

	/* tx may have up to 2 lnet msgs to finalise */
	lntmsg[0] = tx->tx_lntmsg[0]; tx->tx_lntmsg[0] = NULL;
	lntmsg[1] = tx->tx_lntmsg[1]; tx->tx_lntmsg[1] = NULL;
	rc = tx->tx_status;

	if (tx->tx_conn != NULL) {
		kiblnd_conn_decref(tx->tx_conn);
		tx->tx_conn = NULL;
	}

	tx->tx_nwrq = tx->tx_nsge = 0;
	tx->tx_status = 0;

	kiblnd_pool_free_node(&tx->tx_pool->tpo_pool, &tx->tx_list);

	/* delay finalize until my descs have been freed */
	for (i = 0; i < 2; i++) {
		if (lntmsg[i] == NULL)
			continue;

		/* propagate health status to LNet for requests */
		if (i == 0 && lntmsg[i])
			lntmsg[i]->msg_health_status = tx->tx_hstatus;

		lnet_finalize(lntmsg[i], rc);
	}
}

void
kiblnd_txlist_done(struct list_head *txlist, int status,
		   enum lnet_msg_hstatus hstatus)
{
	struct kib_tx *tx;

	while (!list_empty(txlist)) {
		tx = list_entry(txlist->next, struct kib_tx, tx_list);

		list_del(&tx->tx_list);
		/* complete now */
		tx->tx_waiting = 0;
		tx->tx_status = status;
		if (hstatus != LNET_MSG_STATUS_OK)
			tx->tx_hstatus = hstatus;
		kiblnd_tx_done(tx);
	}
}

static struct kib_tx *
kiblnd_get_idle_tx(struct lnet_ni *ni, lnet_nid_t target)
{
	struct kib_net *net = ni->ni_data;
	struct list_head *node;
	struct kib_tx *tx;
	struct kib_tx_poolset *tps;

	tps = net->ibn_tx_ps[lnet_cpt_of_nid(target, ni)];
	node = kiblnd_pool_alloc_node(&tps->tps_poolset);
        if (node == NULL)
                return NULL;
	tx = container_of(node, struct kib_tx, tx_list);

        LASSERT (tx->tx_nwrq == 0);
        LASSERT (!tx->tx_queued);
        LASSERT (tx->tx_sending == 0);
        LASSERT (!tx->tx_waiting);
        LASSERT (tx->tx_status == 0);
        LASSERT (tx->tx_conn == NULL);
        LASSERT (tx->tx_lntmsg[0] == NULL);
        LASSERT (tx->tx_lntmsg[1] == NULL);
        LASSERT (tx->tx_nfrags == 0);

	tx->tx_gaps = false;
	tx->tx_hstatus = LNET_MSG_STATUS_OK;

        return tx;
}

static void
kiblnd_drop_rx(struct kib_rx *rx)
{
	struct kib_conn *conn = rx->rx_conn;
	struct kib_sched_info *sched = conn->ibc_sched;
	unsigned long flags;

	spin_lock_irqsave(&sched->ibs_lock, flags);
	LASSERT(conn->ibc_nrx > 0);
	conn->ibc_nrx--;
	spin_unlock_irqrestore(&sched->ibs_lock, flags);

	kiblnd_conn_decref(conn);
}

int
kiblnd_post_rx(struct kib_rx *rx, int credit)
{
	struct kib_conn *conn = rx->rx_conn;
	struct kib_net *net = conn->ibc_peer->ibp_ni->ni_data;
	struct ib_recv_wr *bad_wrq = NULL;
#ifdef HAVE_IB_GET_DMA_MR
	struct ib_mr *mr = conn->ibc_hdev->ibh_mrs;
#endif
	int rc;

	LASSERT (net != NULL);
	LASSERT (!in_interrupt());
	LASSERT (credit == IBLND_POSTRX_NO_CREDIT ||
		 credit == IBLND_POSTRX_PEER_CREDIT ||
		 credit == IBLND_POSTRX_RSRVD_CREDIT);
#ifdef HAVE_IB_GET_DMA_MR
	LASSERT(mr != NULL);

	rx->rx_sge.lkey   = mr->lkey;
#else
	rx->rx_sge.lkey   = conn->ibc_hdev->ibh_pd->local_dma_lkey;
#endif
        rx->rx_sge.addr   = rx->rx_msgaddr;
        rx->rx_sge.length = IBLND_MSG_SIZE;

        rx->rx_wrq.next = NULL;
        rx->rx_wrq.sg_list = &rx->rx_sge;
        rx->rx_wrq.num_sge = 1;
        rx->rx_wrq.wr_id = kiblnd_ptr2wreqid(rx, IBLND_WID_RX);

        LASSERT (conn->ibc_state >= IBLND_CONN_INIT);
        LASSERT (rx->rx_nob >= 0);              /* not posted */

        if (conn->ibc_state > IBLND_CONN_ESTABLISHED) {
                kiblnd_drop_rx(rx);             /* No more posts for this rx */
                return 0;
        }

        rx->rx_nob = -1;                        /* flag posted */

	/* NB: need an extra reference after ib_post_recv because we don't
	 * own this rx (and rx::rx_conn) anymore, LU-5678.
	 */
	kiblnd_conn_addref(conn);
#ifdef HAVE_IB_POST_SEND_RECV_CONST
	rc = ib_post_recv(conn->ibc_cmid->qp, &rx->rx_wrq,
			  (const struct ib_recv_wr **)&bad_wrq);
#else
	rc = ib_post_recv(conn->ibc_cmid->qp, &rx->rx_wrq, &bad_wrq);
#endif
	if (unlikely(rc != 0)) {
		CERROR("Can't post rx for %s: %d, bad_wrq: %p\n",
		       libcfs_nid2str(conn->ibc_peer->ibp_nid), rc, bad_wrq);
		rx->rx_nob = 0;
	}

	if (conn->ibc_state < IBLND_CONN_ESTABLISHED) /* Initial post */
		goto out;

	if (unlikely(rc != 0)) {
		kiblnd_close_conn(conn, rc);
		kiblnd_drop_rx(rx);	/* No more posts for this rx */
		goto out;
	}

	if (credit == IBLND_POSTRX_NO_CREDIT)
		goto out;

	spin_lock(&conn->ibc_lock);
	if (credit == IBLND_POSTRX_PEER_CREDIT)
		conn->ibc_outstanding_credits++;
	else
		conn->ibc_reserved_credits++;
	kiblnd_check_sends_locked(conn);
	spin_unlock(&conn->ibc_lock);

out:
	kiblnd_conn_decref(conn);
	return rc;
}

static struct kib_tx *
kiblnd_find_waiting_tx_locked(struct kib_conn *conn, int txtype, u64 cookie)
{
	struct list_head *tmp;

	list_for_each(tmp, &conn->ibc_active_txs) {
		struct kib_tx *tx = list_entry(tmp, struct kib_tx, tx_list);

		LASSERT(!tx->tx_queued);
		LASSERT(tx->tx_sending != 0 || tx->tx_waiting);

		if (tx->tx_cookie != cookie)
			continue;

		if (tx->tx_waiting &&
		    tx->tx_msg->ibm_type == txtype)
			return tx;

		CWARN("Bad completion: %swaiting, type %x (wanted %x)\n",
		      tx->tx_waiting ? "" : "NOT ",
		      tx->tx_msg->ibm_type, txtype);
	}
	return NULL;
}

static void
kiblnd_handle_completion(struct kib_conn *conn, int txtype, int status, u64 cookie)
{
	struct kib_tx *tx;
	struct lnet_ni *ni = conn->ibc_peer->ibp_ni;
	int idle;

	spin_lock(&conn->ibc_lock);

	tx = kiblnd_find_waiting_tx_locked(conn, txtype, cookie);
	if (tx == NULL) {
		spin_unlock(&conn->ibc_lock);

		CWARN("Unmatched completion type %x cookie %#llx from %s\n",
		      txtype, cookie, libcfs_nid2str(conn->ibc_peer->ibp_nid));
		kiblnd_close_conn(conn, -EPROTO);
		return;
	}

	if (tx->tx_status == 0) {               /* success so far */
		if (status < 0) {               /* failed? */
			tx->tx_status = status;
			tx->tx_hstatus = LNET_MSG_STATUS_REMOTE_ERROR;
		} else if (txtype == IBLND_MSG_GET_REQ) {
			lnet_set_reply_msg_len(ni, tx->tx_lntmsg[1], status);
		}
	}

	tx->tx_waiting = 0;

	idle = !tx->tx_queued && (tx->tx_sending == 0);
	if (idle)
		list_del(&tx->tx_list);

	spin_unlock(&conn->ibc_lock);

	if (idle)
		kiblnd_tx_done(tx);
}

static void
kiblnd_send_completion(struct kib_conn *conn, int type, int status, u64 cookie)
{
	struct lnet_ni *ni = conn->ibc_peer->ibp_ni;
	struct kib_tx *tx = kiblnd_get_idle_tx(ni, conn->ibc_peer->ibp_nid);

        if (tx == NULL) {
                CERROR("Can't get tx for completion %x for %s\n",
                       type, libcfs_nid2str(conn->ibc_peer->ibp_nid));
                return;
        }

        tx->tx_msg->ibm_u.completion.ibcm_status = status;
        tx->tx_msg->ibm_u.completion.ibcm_cookie = cookie;
	kiblnd_init_tx_msg(ni, tx, type, sizeof(struct kib_completion_msg));

        kiblnd_queue_tx(tx, conn);
}

static void
kiblnd_handle_rx(struct kib_rx *rx)
{
	struct kib_msg *msg = rx->rx_msg;
	struct kib_conn   *conn = rx->rx_conn;
	struct lnet_ni *ni = conn->ibc_peer->ibp_ni;
        int           credits = msg->ibm_credits;
	struct kib_tx *tx;
        int           rc = 0;
        int           rc2;
        int           post_credit;

        LASSERT (conn->ibc_state >= IBLND_CONN_ESTABLISHED);

        CDEBUG (D_NET, "Received %x[%d] from %s\n",
                msg->ibm_type, credits,
                libcfs_nid2str(conn->ibc_peer->ibp_nid));

        if (credits != 0) {
                /* Have I received credits that will let me send? */
		spin_lock(&conn->ibc_lock);

		if (conn->ibc_credits + credits >
		    conn->ibc_queue_depth) {
			rc2 = conn->ibc_credits;
			spin_unlock(&conn->ibc_lock);

			CERROR("Bad credits from %s: %d + %d > %d\n",
			       libcfs_nid2str(conn->ibc_peer->ibp_nid),
			       rc2, credits,
			       conn->ibc_queue_depth);

			kiblnd_close_conn(conn, -EPROTO);
			kiblnd_post_rx(rx, IBLND_POSTRX_NO_CREDIT);
			return;
		}

                conn->ibc_credits += credits;

                /* This ensures the credit taken by NOOP can be returned */
                if (msg->ibm_type == IBLND_MSG_NOOP &&
                    !IBLND_OOB_CAPABLE(conn->ibc_version)) /* v1 only */
                        conn->ibc_outstanding_credits++;

		kiblnd_check_sends_locked(conn);
		spin_unlock(&conn->ibc_lock);
        }

        switch (msg->ibm_type) {
        default:
                CERROR("Bad IBLND message type %x from %s\n",
                       msg->ibm_type, libcfs_nid2str(conn->ibc_peer->ibp_nid));
                post_credit = IBLND_POSTRX_NO_CREDIT;
                rc = -EPROTO;
                break;

        case IBLND_MSG_NOOP:
                if (IBLND_OOB_CAPABLE(conn->ibc_version)) {
                        post_credit = IBLND_POSTRX_NO_CREDIT;
                        break;
                }

                if (credits != 0) /* credit already posted */
                        post_credit = IBLND_POSTRX_NO_CREDIT;
                else              /* a keepalive NOOP */
                        post_credit = IBLND_POSTRX_PEER_CREDIT;
                break;

        case IBLND_MSG_IMMEDIATE:
                post_credit = IBLND_POSTRX_DONT_POST;
                rc = lnet_parse(ni, &msg->ibm_u.immediate.ibim_hdr,
                                msg->ibm_srcnid, rx, 0);
                if (rc < 0)                     /* repost on error */
                        post_credit = IBLND_POSTRX_PEER_CREDIT;
                break;

        case IBLND_MSG_PUT_REQ:
                post_credit = IBLND_POSTRX_DONT_POST;
                rc = lnet_parse(ni, &msg->ibm_u.putreq.ibprm_hdr,
                                msg->ibm_srcnid, rx, 1);
                if (rc < 0)                     /* repost on error */
                        post_credit = IBLND_POSTRX_PEER_CREDIT;
                break;

        case IBLND_MSG_PUT_NAK:
                CWARN ("PUT_NACK from %s\n",
                       libcfs_nid2str(conn->ibc_peer->ibp_nid));
                post_credit = IBLND_POSTRX_RSRVD_CREDIT;
                kiblnd_handle_completion(conn, IBLND_MSG_PUT_REQ,
                                         msg->ibm_u.completion.ibcm_status,
                                         msg->ibm_u.completion.ibcm_cookie);
                break;

        case IBLND_MSG_PUT_ACK:
                post_credit = IBLND_POSTRX_RSRVD_CREDIT;

		spin_lock(&conn->ibc_lock);
		tx = kiblnd_find_waiting_tx_locked(conn, IBLND_MSG_PUT_REQ,
					msg->ibm_u.putack.ibpam_src_cookie);
		if (tx != NULL)
			list_del(&tx->tx_list);
		spin_unlock(&conn->ibc_lock);

                if (tx == NULL) {
                        CERROR("Unmatched PUT_ACK from %s\n",
                               libcfs_nid2str(conn->ibc_peer->ibp_nid));
                        rc = -EPROTO;
                        break;
                }

                LASSERT (tx->tx_waiting);
                /* CAVEAT EMPTOR: I could be racing with tx_complete, but...
                 * (a) I can overwrite tx_msg since my peer_ni has received it!
                 * (b) tx_waiting set tells tx_complete() it's not done. */

		tx->tx_nwrq = tx->tx_nsge = 0;	/* overwrite PUT_REQ */

                rc2 = kiblnd_init_rdma(conn, tx, IBLND_MSG_PUT_DONE,
                                       kiblnd_rd_size(&msg->ibm_u.putack.ibpam_rd),
                                       &msg->ibm_u.putack.ibpam_rd,
                                       msg->ibm_u.putack.ibpam_dst_cookie);
                if (rc2 < 0)
                        CERROR("Can't setup rdma for PUT to %s: %d\n",
                               libcfs_nid2str(conn->ibc_peer->ibp_nid), rc2);

		spin_lock(&conn->ibc_lock);
		tx->tx_waiting = 0;	/* clear waiting and queue atomically */
		kiblnd_queue_tx_locked(tx, conn);
		spin_unlock(&conn->ibc_lock);
		break;

        case IBLND_MSG_PUT_DONE:
                post_credit = IBLND_POSTRX_PEER_CREDIT;
                kiblnd_handle_completion(conn, IBLND_MSG_PUT_ACK,
                                         msg->ibm_u.completion.ibcm_status,
                                         msg->ibm_u.completion.ibcm_cookie);
                break;

        case IBLND_MSG_GET_REQ:
                post_credit = IBLND_POSTRX_DONT_POST;
                rc = lnet_parse(ni, &msg->ibm_u.get.ibgm_hdr,
                                msg->ibm_srcnid, rx, 1);
                if (rc < 0)                     /* repost on error */
                        post_credit = IBLND_POSTRX_PEER_CREDIT;
                break;

        case IBLND_MSG_GET_DONE:
                post_credit = IBLND_POSTRX_RSRVD_CREDIT;
                kiblnd_handle_completion(conn, IBLND_MSG_GET_REQ,
                                         msg->ibm_u.completion.ibcm_status,
                                         msg->ibm_u.completion.ibcm_cookie);
                break;
        }

        if (rc < 0)                             /* protocol error */
                kiblnd_close_conn(conn, rc);

        if (post_credit != IBLND_POSTRX_DONT_POST)
                kiblnd_post_rx(rx, post_credit);
}

static void
kiblnd_rx_complete(struct kib_rx *rx, int status, int nob)
{
	struct kib_msg *msg = rx->rx_msg;
	struct kib_conn   *conn = rx->rx_conn;
	struct lnet_ni *ni = conn->ibc_peer->ibp_ni;
	struct kib_net *net = ni->ni_data;
	int rc;
	int err = -EIO;

        LASSERT (net != NULL);
        LASSERT (rx->rx_nob < 0);               /* was posted */
        rx->rx_nob = 0;                         /* isn't now */

        if (conn->ibc_state > IBLND_CONN_ESTABLISHED)
                goto ignore;

        if (status != IB_WC_SUCCESS) {
                CNETERR("Rx from %s failed: %d\n",
                        libcfs_nid2str(conn->ibc_peer->ibp_nid), status);
                goto failed;
        }

        LASSERT (nob >= 0);
        rx->rx_nob = nob;

        rc = kiblnd_unpack_msg(msg, rx->rx_nob);
        if (rc != 0) {
                CERROR ("Error %d unpacking rx from %s\n",
                        rc, libcfs_nid2str(conn->ibc_peer->ibp_nid));
                goto failed;
        }

        if (msg->ibm_srcnid != conn->ibc_peer->ibp_nid ||
            msg->ibm_dstnid != ni->ni_nid ||
            msg->ibm_srcstamp != conn->ibc_incarnation ||
            msg->ibm_dststamp != net->ibn_incarnation) {
                CERROR ("Stale rx from %s\n",
                        libcfs_nid2str(conn->ibc_peer->ibp_nid));
                err = -ESTALE;
                goto failed;
        }

        /* set time last known alive */
        kiblnd_peer_alive(conn->ibc_peer);

        /* racing with connection establishment/teardown! */

        if (conn->ibc_state < IBLND_CONN_ESTABLISHED) {
		rwlock_t  *g_lock = &kiblnd_data.kib_global_lock;
		unsigned long  flags;

		write_lock_irqsave(g_lock, flags);
		/* must check holding global lock to eliminate race */
		if (conn->ibc_state < IBLND_CONN_ESTABLISHED) {
			list_add_tail(&rx->rx_list, &conn->ibc_early_rxs);
			write_unlock_irqrestore(g_lock, flags);
			return;
		}
		write_unlock_irqrestore(g_lock, flags);
        }
        kiblnd_handle_rx(rx);
        return;

 failed:
        CDEBUG(D_NET, "rx %p conn %p\n", rx, conn);
        kiblnd_close_conn(conn, err);
 ignore:
        kiblnd_drop_rx(rx);                     /* Don't re-post rx. */
}

static int
kiblnd_fmr_map_tx(struct kib_net *net, struct kib_tx *tx,
		  struct kib_rdma_desc *rd, u32 nob)
{
	struct kib_hca_dev *hdev;
	struct kib_dev *dev;
	struct kib_fmr_poolset *fps;
	int			cpt;
	int			rc;
	int i;

	LASSERT(tx->tx_pool != NULL);
	LASSERT(tx->tx_pool->tpo_pool.po_owner != NULL);

	dev = net->ibn_dev;
	hdev = tx->tx_pool->tpo_hdev;
	cpt = tx->tx_pool->tpo_pool.po_owner->ps_cpt;

	/*
	 * If we're dealing with FastReg, but the device doesn't
	 * support GAPS and the tx has GAPS, then there is no real point
	 * in trying to map the memory, because it'll just fail. So
	 * preemptively fail with an appropriate message
	 */
	if ((dev->ibd_dev_caps & IBLND_DEV_CAPS_FASTREG_ENABLED) &&
	    !(dev->ibd_dev_caps & IBLND_DEV_CAPS_FASTREG_GAPS_SUPPORT) &&
	    tx->tx_gaps) {
		CERROR("Using FastReg with no GAPS support, but tx has gaps. "
		       "Try setting use_fastreg_gaps to 1\n");
		return -EPROTONOSUPPORT;
	}

	/*
	 * FMR does not support gaps but the tx has gaps then
	 * we should make sure that the number of fragments we'll be sending
	 * over fits within the number of fragments negotiated on the
	 * connection, otherwise, we won't be able to RDMA the data.
	 * We need to maintain the number of fragments negotiation on the
	 * connection for backwards compatibility.
	 */
	if (tx->tx_gaps && (dev->ibd_dev_caps & IBLND_DEV_CAPS_FMR_ENABLED)) {
		if (tx->tx_conn &&
		    tx->tx_conn->ibc_max_frags <= rd->rd_nfrags) {
			CERROR("TX number of frags (%d) is <= than connection"
			       " number of frags (%d). Consider setting peer's"
			       " map_on_demand to 256\n", tx->tx_nfrags,
			       tx->tx_conn->ibc_max_frags);
			return -EFBIG;
		}
	}

	fps = net->ibn_fmr_ps[cpt];
	rc = kiblnd_fmr_pool_map(fps, tx, rd, nob, 0, &tx->tx_fmr);
	if (rc != 0) {
		CERROR("Can't map %u pages: %d\n", nob, rc);
		return rc;
	}

	/*
	 * If rd is not tx_rd, it's going to get sent to a peer_ni, who will
	 * need the rkey
	 */
	rd->rd_key = tx->tx_fmr.fmr_key;
	/*
	 * for FastReg or FMR with no gaps we can accumulate all
	 * the fragments in one FastReg or FMR fragment.
	 */
	if (((dev->ibd_dev_caps & IBLND_DEV_CAPS_FMR_ENABLED) && !tx->tx_gaps) ||
	    (dev->ibd_dev_caps & IBLND_DEV_CAPS_FASTREG_ENABLED)) {
		/* FMR requires zero based address */
		if (dev->ibd_dev_caps & IBLND_DEV_CAPS_FMR_ENABLED)
			rd->rd_frags[0].rf_addr &= ~hdev->ibh_page_mask;
		rd->rd_frags[0].rf_nob = nob;
		rd->rd_nfrags = 1;
	} else {
		/*
		 * We're transmitting with gaps using FMR.
		 * We'll need to use multiple fragments and identify the
		 * zero based address of each fragment.
		 */
		for (i = 0; i < rd->rd_nfrags; i++) {
			rd->rd_frags[i].rf_addr &= ~hdev->ibh_page_mask;
			rd->rd_frags[i].rf_addr += i << hdev->ibh_page_shift;
		}
	}

	return 0;
}

static void
kiblnd_unmap_tx(struct kib_tx *tx)
{
	if (tx->tx_fmr.fmr_pfmr || tx->tx_fmr.fmr_frd)
		kiblnd_fmr_pool_unmap(&tx->tx_fmr, tx->tx_status);

	if (tx->tx_nfrags != 0) {
		kiblnd_dma_unmap_sg(tx->tx_pool->tpo_hdev->ibh_ibdev,
				    tx->tx_frags, tx->tx_nfrags, tx->tx_dmadir);
		tx->tx_nfrags = 0;
	}
}

#ifdef HAVE_IB_GET_DMA_MR
static struct ib_mr *
kiblnd_find_rd_dma_mr(struct lnet_ni *ni, struct kib_rdma_desc *rd)
{
	struct kib_net *net = ni->ni_data;
	struct kib_hca_dev *hdev = net->ibn_dev->ibd_hdev;
	struct lnet_ioctl_config_o2iblnd_tunables *tunables;

	tunables = &ni->ni_lnd_tunables.lnd_tun_u.lnd_o2ib;

	/*
	 * if map-on-demand is turned on and the device supports
	 * either FMR or FastReg then use that. Otherwise use global
	 * memory regions. If that's not available either, then you're
	 * dead in the water and fail the operation.
	 */
	if (tunables->lnd_map_on_demand &&
	    (net->ibn_dev->ibd_dev_caps & IBLND_DEV_CAPS_FASTREG_ENABLED ||
	     net->ibn_dev->ibd_dev_caps & IBLND_DEV_CAPS_FMR_ENABLED))
		return NULL;

	/*
	 * hdev->ibh_mrs can be NULL. This case is dealt with gracefully
	 * in the call chain. The mapping will fail with appropriate error
	 * message.
	 */
	return hdev->ibh_mrs;
}
#endif

static int kiblnd_map_tx(struct lnet_ni *ni, struct kib_tx *tx,
			 struct kib_rdma_desc *rd, int nfrags)
{
	struct kib_net *net = ni->ni_data;
	struct kib_hca_dev *hdev = net->ibn_dev->ibd_hdev;
#ifdef HAVE_IB_GET_DMA_MR
	struct ib_mr *mr = NULL;
#endif
	__u32 nob;
	int i;

        /* If rd is not tx_rd, it's going to get sent to a peer_ni and I'm the
         * RDMA sink */
        tx->tx_dmadir = (rd != tx->tx_rd) ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
	tx->tx_nfrags = nfrags;

	rd->rd_nfrags = kiblnd_dma_map_sg(hdev->ibh_ibdev, tx->tx_frags,
					  tx->tx_nfrags, tx->tx_dmadir);

        for (i = 0, nob = 0; i < rd->rd_nfrags; i++) {
                rd->rd_frags[i].rf_nob  = kiblnd_sg_dma_len(
                        hdev->ibh_ibdev, &tx->tx_frags[i]);
                rd->rd_frags[i].rf_addr = kiblnd_sg_dma_address(
                        hdev->ibh_ibdev, &tx->tx_frags[i]);
                nob += rd->rd_frags[i].rf_nob;
        }

#ifdef HAVE_IB_GET_DMA_MR
	mr = kiblnd_find_rd_dma_mr(ni, rd);
	if (mr != NULL) {
		/* found pre-mapping MR */
		rd->rd_key = (rd != tx->tx_rd) ? mr->rkey : mr->lkey;
		return 0;
	}
#endif

	if (net->ibn_fmr_ps != NULL)
		return kiblnd_fmr_map_tx(net, tx, rd, nob);

	return -EINVAL;
}

static int kiblnd_setup_rd_iov(struct lnet_ni *ni, struct kib_tx *tx,
			       struct kib_rdma_desc *rd, unsigned int niov,
			       struct kvec *iov, int offset, int nob)
{
	struct kib_net *net = ni->ni_data;
	struct page *page;
        struct scatterlist *sg;
        unsigned long       vaddr;
        int                 fragnob;
        int                 page_offset;
	unsigned int	    max_niov;

        LASSERT (nob > 0);
        LASSERT (niov > 0);
        LASSERT (net != NULL);

        while (offset >= iov->iov_len) {
                offset -= iov->iov_len;
                niov--;
                iov++;
                LASSERT (niov > 0);
        }

	max_niov = niov;

	sg = tx->tx_frags;
	do {
		LASSERT(niov > 0);

		vaddr = ((unsigned long)iov->iov_base) + offset;
		page_offset = vaddr & (PAGE_SIZE - 1);
		page = lnet_kvaddr_to_page(vaddr);
		if (page == NULL) {
			CERROR("Can't find page\n");
			return -EFAULT;
		}

		fragnob = min((int)(iov->iov_len - offset), nob);
		fragnob = min(fragnob, (int)PAGE_SIZE - page_offset);

		/*
		 * We're allowed to start at a non-aligned page offset in
		 * the first fragment and end at a non-aligned page offset
		 * in the last fragment.
		 */
		if ((fragnob < (int)PAGE_SIZE - page_offset) &&
		    (niov < max_niov) && nob > fragnob) {
			CDEBUG(D_NET, "fragnob %d < available page %d: with"
				      " remaining %d iovs with %d nob left\n",
			       fragnob, (int)PAGE_SIZE - page_offset, niov,
			       nob);
			tx->tx_gaps = true;
		}

		sg_set_page(sg, page, fragnob, page_offset);
		sg = sg_next(sg);
		if (!sg) {
			CERROR("lacking enough sg entries to map tx\n");
			return -EFAULT;
		}

                if (offset + fragnob < iov->iov_len) {
                        offset += fragnob;
                } else {
                        offset = 0;
                        iov++;
                        niov--;
                }
                nob -= fragnob;
        } while (nob > 0);

        return kiblnd_map_tx(ni, tx, rd, sg - tx->tx_frags);
}

static int kiblnd_setup_rd_kiov(struct lnet_ni *ni, struct kib_tx *tx,
				struct kib_rdma_desc *rd, int nkiov,
				lnet_kiov_t *kiov, int offset, int nob)
{
	struct kib_net *net = ni->ni_data;
	struct scatterlist *sg;
	int                 fragnob;
	int		    max_nkiov;

	CDEBUG(D_NET, "niov %d offset %d nob %d\n", nkiov, offset, nob);

	LASSERT(nob > 0);
	LASSERT(nkiov > 0);
	LASSERT(net != NULL);

	while (offset >= kiov->kiov_len) {
		offset -= kiov->kiov_len;
		nkiov--;
		kiov++;
		LASSERT(nkiov > 0);
	}

	max_nkiov = nkiov;

	sg = tx->tx_frags;
	do {
		LASSERT(nkiov > 0);

		fragnob = min((int)(kiov->kiov_len - offset), nob);

		/*
		 * We're allowed to start at a non-aligned page offset in
		 * the first fragment and end at a non-aligned page offset
		 * in the last fragment.
		 */
		if ((fragnob < (int)(kiov->kiov_len - offset)) &&
		    nkiov < max_nkiov && nob > fragnob) {
			CDEBUG(D_NET, "fragnob %d < available page %d: with"
				      " remaining %d kiovs with %d nob left\n",
			       fragnob, (int)(kiov->kiov_len - offset),
			       nkiov, nob);
			tx->tx_gaps = true;
		}

		sg_set_page(sg, kiov->kiov_page, fragnob,
			    kiov->kiov_offset + offset);
		sg = sg_next(sg);
		if (!sg) {
			CERROR("lacking enough sg entries to map tx\n");
			return -EFAULT;
		}

		offset = 0;
		kiov++;
		nkiov--;
		nob -= fragnob;
	} while (nob > 0);

	return kiblnd_map_tx(ni, tx, rd, sg - tx->tx_frags);
}

static int
kiblnd_post_tx_locked(struct kib_conn *conn, struct kib_tx *tx, int credit)
__must_hold(&conn->ibc_lock)
{
	struct kib_msg *msg = tx->tx_msg;
	struct kib_peer_ni *peer_ni = conn->ibc_peer;
	struct lnet_ni *ni = peer_ni->ibp_ni;
	int ver = conn->ibc_version;
	int rc;
	int done;

	LASSERT(tx->tx_queued);
	/* We rely on this for QP sizing */
	LASSERT(tx->tx_nwrq > 0 && tx->tx_nsge >= 0);
	LASSERT(tx->tx_nwrq <= 1 + conn->ibc_max_frags);

	LASSERT(credit == 0 || credit == 1);
	LASSERT(conn->ibc_outstanding_credits >= 0);
	LASSERT(conn->ibc_outstanding_credits <= conn->ibc_queue_depth);
	LASSERT(conn->ibc_credits >= 0);
	LASSERT(conn->ibc_credits <= conn->ibc_queue_depth);

	if (conn->ibc_nsends_posted ==
	    kiblnd_concurrent_sends(ver, ni)) {
		/* tx completions outstanding... */
		CDEBUG(D_NET, "%s: posted enough\n",
		       libcfs_nid2str(peer_ni->ibp_nid));
		return -EAGAIN;
	}

        if (credit != 0 && conn->ibc_credits == 0) {   /* no credits */
                CDEBUG(D_NET, "%s: no credits\n",
                       libcfs_nid2str(peer_ni->ibp_nid));
                return -EAGAIN;
        }

        if (credit != 0 && !IBLND_OOB_CAPABLE(ver) &&
            conn->ibc_credits == 1 &&   /* last credit reserved */
            msg->ibm_type != IBLND_MSG_NOOP) {      /* for NOOP */
                CDEBUG(D_NET, "%s: not using last credit\n",
                       libcfs_nid2str(peer_ni->ibp_nid));
                return -EAGAIN;
        }

        /* NB don't drop ibc_lock before bumping tx_sending */
	list_del(&tx->tx_list);
        tx->tx_queued = 0;

        if (msg->ibm_type == IBLND_MSG_NOOP &&
            (!kiblnd_need_noop(conn) ||     /* redundant NOOP */
             (IBLND_OOB_CAPABLE(ver) && /* posted enough NOOP */
              conn->ibc_noops_posted == IBLND_OOB_MSGS(ver)))) {
		/* OK to drop when posted enough NOOPs, since
		 * kiblnd_check_sends_locked will queue NOOP again when
		 * posted NOOPs complete */
		spin_unlock(&conn->ibc_lock);
		tx->tx_hstatus = LNET_MSG_STATUS_LOCAL_ERROR;
		kiblnd_tx_done(tx);
		spin_lock(&conn->ibc_lock);
                CDEBUG(D_NET, "%s(%d): redundant or enough NOOP\n",
                       libcfs_nid2str(peer_ni->ibp_nid),
                       conn->ibc_noops_posted);
                return 0;
        }

        kiblnd_pack_msg(peer_ni->ibp_ni, msg, ver, conn->ibc_outstanding_credits,
                        peer_ni->ibp_nid, conn->ibc_incarnation);

	conn->ibc_credits -= credit;
	conn->ibc_outstanding_credits = 0;
	conn->ibc_nsends_posted++;
	if (msg->ibm_type == IBLND_MSG_NOOP)
		conn->ibc_noops_posted++;

	/* CAVEAT EMPTOR!  This tx could be the PUT_DONE of an RDMA
	 * PUT.  If so, it was first queued here as a PUT_REQ, sent and
	 * stashed on ibc_active_txs, matched by an incoming PUT_ACK,
	 * and then re-queued here.  It's (just) possible that
	 * tx_sending is non-zero if we've not done the tx_complete()
	 * from the first send; hence the ++ rather than = below. */
	tx->tx_sending++;
	list_add(&tx->tx_list, &conn->ibc_active_txs);

        /* I'm still holding ibc_lock! */
        if (conn->ibc_state != IBLND_CONN_ESTABLISHED) {
                rc = -ECONNABORTED;
        } else if (tx->tx_pool->tpo_pool.po_failed ||
                 conn->ibc_hdev != tx->tx_pool->tpo_hdev) {
                /* close_conn will launch failover */
                rc = -ENETDOWN;
        } else {
		struct kib_fast_reg_descriptor *frd = tx->tx_fmr.fmr_frd;
		struct ib_send_wr *bad = &tx->tx_wrq[tx->tx_nwrq - 1].wr;
		struct ib_send_wr *wr  = &tx->tx_wrq[0].wr;

		if (frd != NULL) {
			if (!frd->frd_valid) {
				wr = &frd->frd_inv_wr.wr;
				wr->next = &frd->frd_fastreg_wr.wr;
			} else {
				wr = &frd->frd_fastreg_wr.wr;
			}
			frd->frd_fastreg_wr.wr.next = &tx->tx_wrq[0].wr;
		}

		LASSERTF(bad->wr_id == kiblnd_ptr2wreqid(tx, IBLND_WID_TX),
			 "bad wr_id %#llx, opc %d, flags %d, peer_ni: %s\n",
			 bad->wr_id, bad->opcode, bad->send_flags,
			 libcfs_nid2str(conn->ibc_peer->ibp_nid));

		bad = NULL;
		if (lnet_send_error_simulation(tx->tx_lntmsg[0], &tx->tx_hstatus))
			rc = -EINVAL;
		else
#ifdef HAVE_IB_POST_SEND_RECV_CONST
			rc = ib_post_send(conn->ibc_cmid->qp, wr,
					  (const struct ib_send_wr **)&bad);
#else
			rc = ib_post_send(conn->ibc_cmid->qp, wr, &bad);
#endif
	}

	conn->ibc_last_send = ktime_get();

        if (rc == 0)
                return 0;

        /* NB credits are transferred in the actual
         * message, which can only be the last work item */
        conn->ibc_credits += credit;
        conn->ibc_outstanding_credits += msg->ibm_credits;
        conn->ibc_nsends_posted--;
        if (msg->ibm_type == IBLND_MSG_NOOP)
                conn->ibc_noops_posted--;

        tx->tx_status = rc;
        tx->tx_waiting = 0;
        tx->tx_sending--;

        done = (tx->tx_sending == 0);
        if (done)
		list_del(&tx->tx_list);

	spin_unlock(&conn->ibc_lock);

        if (conn->ibc_state == IBLND_CONN_ESTABLISHED)
                CERROR("Error %d posting transmit to %s\n",
                       rc, libcfs_nid2str(peer_ni->ibp_nid));
        else
                CDEBUG(D_NET, "Error %d posting transmit to %s\n",
                       rc, libcfs_nid2str(peer_ni->ibp_nid));

        kiblnd_close_conn(conn, rc);

	if (done)
		kiblnd_tx_done(tx);

	spin_lock(&conn->ibc_lock);

	return -EIO;
}

static void
kiblnd_check_sends_locked(struct kib_conn *conn)
{
	int ver = conn->ibc_version;
	struct lnet_ni *ni = conn->ibc_peer->ibp_ni;
	struct kib_tx *tx;

        /* Don't send anything until after the connection is established */
        if (conn->ibc_state < IBLND_CONN_ESTABLISHED) {
                CDEBUG(D_NET, "%s too soon\n",
                       libcfs_nid2str(conn->ibc_peer->ibp_nid));
                return;
        }

	LASSERT(conn->ibc_nsends_posted <=
		kiblnd_concurrent_sends(ver, ni));
        LASSERT (!IBLND_OOB_CAPABLE(ver) ||
                 conn->ibc_noops_posted <= IBLND_OOB_MSGS(ver));
        LASSERT (conn->ibc_reserved_credits >= 0);

        while (conn->ibc_reserved_credits > 0 &&
	       !list_empty(&conn->ibc_tx_queue_rsrvd)) {
		tx = list_entry(conn->ibc_tx_queue_rsrvd.next,
				struct kib_tx, tx_list);
		list_move_tail(&tx->tx_list, &conn->ibc_tx_queue);
                conn->ibc_reserved_credits--;
        }

        if (kiblnd_need_noop(conn)) {
		spin_unlock(&conn->ibc_lock);

		tx = kiblnd_get_idle_tx(ni, conn->ibc_peer->ibp_nid);
		if (tx != NULL)
			kiblnd_init_tx_msg(ni, tx, IBLND_MSG_NOOP, 0);

		spin_lock(&conn->ibc_lock);
                if (tx != NULL)
                        kiblnd_queue_tx_locked(tx, conn);
        }

        for (;;) {
                int credit;

		if (!list_empty(&conn->ibc_tx_queue_nocred)) {
                        credit = 0;
			tx = list_entry(conn->ibc_tx_queue_nocred.next,
					struct kib_tx, tx_list);
		} else if (!list_empty(&conn->ibc_tx_noops)) {
                        LASSERT (!IBLND_OOB_CAPABLE(ver));
                        credit = 1;
			tx = list_entry(conn->ibc_tx_noops.next,
					struct kib_tx, tx_list);
		} else if (!list_empty(&conn->ibc_tx_queue)) {
                        credit = 1;
			tx = list_entry(conn->ibc_tx_queue.next,
					struct kib_tx, tx_list);
                } else
                        break;

                if (kiblnd_post_tx_locked(conn, tx, credit) != 0)
                        break;
        }
}

static void
kiblnd_tx_complete(struct kib_tx *tx, int status)
{
        int           failed = (status != IB_WC_SUCCESS);
	struct kib_conn   *conn = tx->tx_conn;
        int           idle;

        LASSERT (tx->tx_sending > 0);

        if (failed) {
                if (conn->ibc_state == IBLND_CONN_ESTABLISHED)
			CNETERR("Tx -> %s cookie %#llx"
                                " sending %d waiting %d: failed %d\n",
                                libcfs_nid2str(conn->ibc_peer->ibp_nid),
                                tx->tx_cookie, tx->tx_sending, tx->tx_waiting,
                                status);

                kiblnd_close_conn(conn, -EIO);
        } else {
                kiblnd_peer_alive(conn->ibc_peer);
        }

	spin_lock(&conn->ibc_lock);

        /* I could be racing with rdma completion.  Whoever makes 'tx' idle
         * gets to free it, which also drops its ref on 'conn'. */

        tx->tx_sending--;
        conn->ibc_nsends_posted--;
        if (tx->tx_msg->ibm_type == IBLND_MSG_NOOP)
                conn->ibc_noops_posted--;

        if (failed) {
		tx->tx_hstatus = LNET_MSG_STATUS_REMOTE_DROPPED;
                tx->tx_waiting = 0;             /* don't wait for peer_ni */
                tx->tx_status = -EIO;
        }

        idle = (tx->tx_sending == 0) &&         /* This is the final callback */
               !tx->tx_waiting &&               /* Not waiting for peer_ni */
               !tx->tx_queued;                  /* Not re-queued (PUT_DONE) */
        if (idle)
		list_del(&tx->tx_list);

	kiblnd_check_sends_locked(conn);
	spin_unlock(&conn->ibc_lock);

	if (idle)
		kiblnd_tx_done(tx);
}

static void
kiblnd_init_tx_msg(struct lnet_ni *ni, struct kib_tx *tx, int type,
		   int body_nob)
{
	struct kib_hca_dev *hdev = tx->tx_pool->tpo_hdev;
	struct ib_sge *sge = &tx->tx_msgsge;
	struct ib_rdma_wr *wrq;
	int nob = offsetof(struct kib_msg, ibm_u) + body_nob;
#ifdef HAVE_IB_GET_DMA_MR
	struct ib_mr *mr = hdev->ibh_mrs;
#endif

	LASSERT(tx->tx_nwrq >= 0);
	LASSERT(tx->tx_nwrq < IBLND_MAX_RDMA_FRAGS + 1);
	LASSERT(nob <= IBLND_MSG_SIZE);
#ifdef HAVE_IB_GET_DMA_MR
	LASSERT(mr != NULL);
#endif

	kiblnd_init_msg(tx->tx_msg, type, body_nob);

#ifdef HAVE_IB_GET_DMA_MR
	sge->lkey   = mr->lkey;
#else
	sge->lkey   = hdev->ibh_pd->local_dma_lkey;
#endif
	sge->addr   = tx->tx_msgaddr;
	sge->length = nob;

	wrq = &tx->tx_wrq[tx->tx_nwrq];
	memset(wrq, 0, sizeof(*wrq));

	wrq->wr.next		= NULL;
	wrq->wr.wr_id		= kiblnd_ptr2wreqid(tx, IBLND_WID_TX);
	wrq->wr.sg_list		= sge;
	wrq->wr.num_sge		= 1;
	wrq->wr.opcode		= IB_WR_SEND;
	wrq->wr.send_flags	= IB_SEND_SIGNALED;

	tx->tx_nwrq++;
}

static int
kiblnd_init_rdma(struct kib_conn *conn, struct kib_tx *tx, int type,
		 int resid, struct kib_rdma_desc *dstrd, u64 dstcookie)
{
	struct kib_msg *ibmsg = tx->tx_msg;
	struct kib_rdma_desc *srcrd = tx->tx_rd;
	struct ib_rdma_wr *wrq = NULL;
	struct ib_sge	  *sge;
	int		   rc  = resid;
	int		   srcidx;
	int		   dstidx;
	int		   sge_nob;
	int		   wrq_sge;

	LASSERT(!in_interrupt());
	LASSERT(tx->tx_nwrq == 0 && tx->tx_nsge == 0);
	LASSERT(type == IBLND_MSG_GET_DONE || type == IBLND_MSG_PUT_DONE);

	for (srcidx = dstidx = wrq_sge = sge_nob = 0;
	     resid > 0; resid -= sge_nob) {
		int	prev = dstidx;

		if (srcidx >= srcrd->rd_nfrags) {
			CERROR("Src buffer exhausted: %d frags\n", srcidx);
			rc = -EPROTO;
			break;
		}

		if (dstidx >= dstrd->rd_nfrags) {
			CERROR("Dst buffer exhausted: %d frags\n", dstidx);
			rc = -EPROTO;
			break;
		}

		if (tx->tx_nwrq >= conn->ibc_max_frags) {
			CERROR("RDMA has too many fragments for peer_ni %s (%d), "
			       "src idx/frags: %d/%d dst idx/frags: %d/%d\n",
			       libcfs_nid2str(conn->ibc_peer->ibp_nid),
			       conn->ibc_max_frags,
			       srcidx, srcrd->rd_nfrags,
			       dstidx, dstrd->rd_nfrags);
			rc = -EMSGSIZE;
			break;
		}

		sge_nob = min3(kiblnd_rd_frag_size(srcrd, srcidx),
			       kiblnd_rd_frag_size(dstrd, dstidx),
			       resid);

		sge = &tx->tx_sge[tx->tx_nsge];
		sge->addr   = kiblnd_rd_frag_addr(srcrd, srcidx);
		sge->lkey   = kiblnd_rd_frag_key(srcrd, srcidx);
		sge->length = sge_nob;

		if (wrq_sge == 0) {
			wrq = &tx->tx_wrq[tx->tx_nwrq];

			wrq->wr.next	= &(wrq + 1)->wr;
			wrq->wr.wr_id	= kiblnd_ptr2wreqid(tx, IBLND_WID_RDMA);
			wrq->wr.sg_list	= sge;
			wrq->wr.opcode	= IB_WR_RDMA_WRITE;
			wrq->wr.send_flags = 0;

#ifdef HAVE_IB_RDMA_WR
			wrq->remote_addr	= kiblnd_rd_frag_addr(dstrd,
								      dstidx);
			wrq->rkey		= kiblnd_rd_frag_key(dstrd,
								     dstidx);
#else
			wrq->wr.wr.rdma.remote_addr = kiblnd_rd_frag_addr(dstrd,
									dstidx);
			wrq->wr.wr.rdma.rkey	= kiblnd_rd_frag_key(dstrd,
								     dstidx);
#endif
		}

		srcidx = kiblnd_rd_consume_frag(srcrd, srcidx, sge_nob);
		dstidx = kiblnd_rd_consume_frag(dstrd, dstidx, sge_nob);

		wrq_sge++;
		if (wrq_sge == *kiblnd_tunables.kib_wrq_sge || dstidx != prev) {
			tx->tx_nwrq++;
			wrq->wr.num_sge = wrq_sge;
			wrq_sge = 0;
		}
		tx->tx_nsge++;
	}

	if (rc < 0)	/* no RDMA if completing with failure */
		tx->tx_nwrq = tx->tx_nsge = 0;

        ibmsg->ibm_u.completion.ibcm_status = rc;
        ibmsg->ibm_u.completion.ibcm_cookie = dstcookie;
        kiblnd_init_tx_msg(conn->ibc_peer->ibp_ni, tx,
			   type, sizeof(struct kib_completion_msg));

        return rc;
}

static void
kiblnd_queue_tx_locked(struct kib_tx *tx, struct kib_conn *conn)
{
	struct list_head *q;
	s64 timeout_ns;

	LASSERT(tx->tx_nwrq > 0);	/* work items set up */
	LASSERT(!tx->tx_queued);	/* not queued for sending already */
	LASSERT(conn->ibc_state >= IBLND_CONN_ESTABLISHED);

	if (conn->ibc_state >= IBLND_CONN_DISCONNECTED) {
		tx->tx_status = -ECONNABORTED;
		tx->tx_waiting = 0;
		if (tx->tx_conn != NULL) {
			/* PUT_DONE first attached to conn as a PUT_REQ */
			LASSERT(tx->tx_conn == conn);
			LASSERT(tx->tx_msg->ibm_type == IBLND_MSG_PUT_DONE);
			tx->tx_conn = NULL;
			kiblnd_conn_decref(conn);
		}
		list_add(&tx->tx_list, &conn->ibc_zombie_txs);

		return;
	}

	timeout_ns = lnet_get_lnd_timeout() * NSEC_PER_SEC;
	tx->tx_queued = 1;
	tx->tx_deadline = ktime_add_ns(ktime_get(), timeout_ns);

        if (tx->tx_conn == NULL) {
                kiblnd_conn_addref(conn);
                tx->tx_conn = conn;
                LASSERT (tx->tx_msg->ibm_type != IBLND_MSG_PUT_DONE);
        } else {
                /* PUT_DONE first attached to conn as a PUT_REQ */
                LASSERT (tx->tx_conn == conn);
                LASSERT (tx->tx_msg->ibm_type == IBLND_MSG_PUT_DONE);
        }

        switch (tx->tx_msg->ibm_type) {
        default:
                LBUG();

        case IBLND_MSG_PUT_REQ:
        case IBLND_MSG_GET_REQ:
                q = &conn->ibc_tx_queue_rsrvd;
                break;

        case IBLND_MSG_PUT_NAK:
        case IBLND_MSG_PUT_ACK:
        case IBLND_MSG_PUT_DONE:
        case IBLND_MSG_GET_DONE:
                q = &conn->ibc_tx_queue_nocred;
                break;

        case IBLND_MSG_NOOP:
                if (IBLND_OOB_CAPABLE(conn->ibc_version))
                        q = &conn->ibc_tx_queue_nocred;
                else
                        q = &conn->ibc_tx_noops;
                break;

        case IBLND_MSG_IMMEDIATE:
                q = &conn->ibc_tx_queue;
                break;
        }

	list_add_tail(&tx->tx_list, q);
}

static void
kiblnd_queue_tx(struct kib_tx *tx, struct kib_conn *conn)
{
	spin_lock(&conn->ibc_lock);
	kiblnd_queue_tx_locked(tx, conn);
	kiblnd_check_sends_locked(conn);
	spin_unlock(&conn->ibc_lock);
}

static int kiblnd_resolve_addr(struct rdma_cm_id *cmid,
                               struct sockaddr_in *srcaddr,
                               struct sockaddr_in *dstaddr,
                               int timeout_ms)
{
        unsigned short port;
        int rc;

        /* allow the port to be reused */
        rc = rdma_set_reuseaddr(cmid, 1);
        if (rc != 0) {
                CERROR("Unable to set reuse on cmid: %d\n", rc);
                return rc;
        }

        /* look for a free privileged port */
        for (port = PROT_SOCK-1; port > 0; port--) {
                srcaddr->sin_port = htons(port);
                rc = rdma_resolve_addr(cmid,
                                       (struct sockaddr *)srcaddr,
                                       (struct sockaddr *)dstaddr,
                                       timeout_ms);
                if (rc == 0) {
                        CDEBUG(D_NET, "bound to port %hu\n", port);
                        return 0;
                } else if (rc == -EADDRINUSE || rc == -EADDRNOTAVAIL) {
                        CDEBUG(D_NET, "bind to port %hu failed: %d\n",
                               port, rc);
                } else {
                        return rc;
                }
        }

        CERROR("Failed to bind to a free privileged port\n");
        return rc;
}

static void
kiblnd_connect_peer(struct kib_peer_ni *peer_ni)
{
        struct rdma_cm_id *cmid;
	struct kib_dev *dev;
	struct kib_net *net = peer_ni->ibp_ni->ni_data;
        struct sockaddr_in srcaddr;
        struct sockaddr_in dstaddr;
	int rc;

        LASSERT (net != NULL);
        LASSERT (peer_ni->ibp_connecting > 0);

	cmid = kiblnd_rdma_create_id(peer_ni->ibp_ni->ni_net_ns,
				     kiblnd_cm_callback, peer_ni,
				     RDMA_PS_TCP, IB_QPT_RC);

        if (IS_ERR(cmid)) {
                CERROR("Can't create CMID for %s: %ld\n",
                       libcfs_nid2str(peer_ni->ibp_nid), PTR_ERR(cmid));
                rc = PTR_ERR(cmid);
                goto failed;
        }

        dev = net->ibn_dev;
        memset(&srcaddr, 0, sizeof(srcaddr));
        srcaddr.sin_family = AF_INET;
        srcaddr.sin_addr.s_addr = htonl(dev->ibd_ifip);

        memset(&dstaddr, 0, sizeof(dstaddr));
        dstaddr.sin_family = AF_INET;
        dstaddr.sin_port = htons(*kiblnd_tunables.kib_service);
        dstaddr.sin_addr.s_addr = htonl(LNET_NIDADDR(peer_ni->ibp_nid));

        kiblnd_peer_addref(peer_ni);               /* cmid's ref */

	if (*kiblnd_tunables.kib_use_priv_port) {
		rc = kiblnd_resolve_addr(cmid, &srcaddr, &dstaddr,
					 lnet_get_lnd_timeout() * 1000);
	} else {
		rc = rdma_resolve_addr(cmid,
				       (struct sockaddr *)&srcaddr,
				       (struct sockaddr *)&dstaddr,
				       lnet_get_lnd_timeout() * 1000);
	}
	if (rc != 0) {
		/* Can't initiate address resolution:  */
		CERROR("Can't resolve addr for %s: %d\n",
		       libcfs_nid2str(peer_ni->ibp_nid), rc);
		goto failed2;
	}

	return;

 failed2:
	kiblnd_peer_connect_failed(peer_ni, 1, rc);
	kiblnd_peer_decref(peer_ni);               /* cmid's ref */
	rdma_destroy_id(cmid);
	return;
 failed:
	kiblnd_peer_connect_failed(peer_ni, 1, rc);
}

bool
kiblnd_reconnect_peer(struct kib_peer_ni *peer_ni)
{
	rwlock_t *glock = &kiblnd_data.kib_global_lock;
	char *reason = NULL;
	LIST_HEAD(txs);
	unsigned long flags;

	write_lock_irqsave(glock, flags);
	if (peer_ni->ibp_reconnecting == 0) {
		if (peer_ni->ibp_accepting)
			reason = "accepting";
		else if (peer_ni->ibp_connecting)
			reason = "connecting";
		else if (!list_empty(&peer_ni->ibp_conns))
			reason = "connected";
		else /* connected then closed */
			reason = "closed";

		goto no_reconnect;
	}

	if (peer_ni->ibp_accepting)
		CNETERR("Detecting race between accepting and reconnecting\n");
	peer_ni->ibp_reconnecting--;

	if (!kiblnd_peer_active(peer_ni)) {
		list_splice_init(&peer_ni->ibp_tx_queue, &txs);
		reason = "unlinked";
		goto no_reconnect;
	}

	peer_ni->ibp_connecting++;
	peer_ni->ibp_reconnected++;

	write_unlock_irqrestore(glock, flags);

	kiblnd_connect_peer(peer_ni);
	return true;

 no_reconnect:
	write_unlock_irqrestore(glock, flags);

	CWARN("Abort reconnection of %s: %s\n",
	      libcfs_nid2str(peer_ni->ibp_nid), reason);
	kiblnd_txlist_done(&txs, -ECONNABORTED,
			   LNET_MSG_STATUS_LOCAL_ABORTED);
	return false;
}

void
kiblnd_launch_tx(struct lnet_ni *ni, struct kib_tx *tx, lnet_nid_t nid)
{
	struct kib_peer_ni *peer_ni;
	struct kib_peer_ni *peer2;
	struct kib_conn *conn;
	rwlock_t *g_lock = &kiblnd_data.kib_global_lock;
        unsigned long      flags;
        int                rc;
	int		   i;
	struct lnet_ioctl_config_o2iblnd_tunables *tunables;

        /* If I get here, I've committed to send, so I complete the tx with
         * failure on any problems */

        LASSERT (tx == NULL || tx->tx_conn == NULL); /* only set when assigned a conn */
        LASSERT (tx == NULL || tx->tx_nwrq > 0);     /* work items have been set up */

        /* First time, just use a read lock since I expect to find my peer_ni
         * connected */
	read_lock_irqsave(g_lock, flags);

        peer_ni = kiblnd_find_peer_locked(ni, nid);
	if (peer_ni != NULL && !list_empty(&peer_ni->ibp_conns)) {
                /* Found a peer_ni with an established connection */
                conn = kiblnd_get_conn_locked(peer_ni);
                kiblnd_conn_addref(conn); /* 1 ref for me... */

		read_unlock_irqrestore(g_lock, flags);

                if (tx != NULL)
                        kiblnd_queue_tx(tx, conn);
                kiblnd_conn_decref(conn); /* ...to here */
                return;
        }

	read_unlock(g_lock);
	/* Re-try with a write lock */
	write_lock(g_lock);

        peer_ni = kiblnd_find_peer_locked(ni, nid);
        if (peer_ni != NULL) {
		if (list_empty(&peer_ni->ibp_conns)) {
                        /* found a peer_ni, but it's still connecting... */
			LASSERT(kiblnd_peer_connecting(peer_ni));
                        if (tx != NULL)
				list_add_tail(&tx->tx_list,
                                                  &peer_ni->ibp_tx_queue);
			write_unlock_irqrestore(g_lock, flags);
		} else {
			conn = kiblnd_get_conn_locked(peer_ni);
			kiblnd_conn_addref(conn); /* 1 ref for me... */

			write_unlock_irqrestore(g_lock, flags);

                        if (tx != NULL)
                                kiblnd_queue_tx(tx, conn);
                        kiblnd_conn_decref(conn); /* ...to here */
                }
                return;
        }

	write_unlock_irqrestore(g_lock, flags);

	/* Allocate a peer_ni ready to add to the peer_ni table and retry */
	rc = kiblnd_create_peer(ni, &peer_ni, nid);
	if (rc != 0) {
		CERROR("Can't create peer_ni %s\n", libcfs_nid2str(nid));
		if (tx != NULL) {
			tx->tx_status = -EHOSTUNREACH;
			tx->tx_waiting = 0;
			tx->tx_hstatus = LNET_MSG_STATUS_LOCAL_ERROR;
			kiblnd_tx_done(tx);
		}
		return;
	}

	write_lock_irqsave(g_lock, flags);

        peer2 = kiblnd_find_peer_locked(ni, nid);
        if (peer2 != NULL) {
		if (list_empty(&peer2->ibp_conns)) {
                        /* found a peer_ni, but it's still connecting... */
			LASSERT(kiblnd_peer_connecting(peer2));
                        if (tx != NULL)
				list_add_tail(&tx->tx_list,
                                                  &peer2->ibp_tx_queue);
			write_unlock_irqrestore(g_lock, flags);
		} else {
			conn = kiblnd_get_conn_locked(peer2);
			kiblnd_conn_addref(conn); /* 1 ref for me... */

			write_unlock_irqrestore(g_lock, flags);

                        if (tx != NULL)
                                kiblnd_queue_tx(tx, conn);
                        kiblnd_conn_decref(conn); /* ...to here */
                }

                kiblnd_peer_decref(peer_ni);
                return;
        }

	/* Brand new peer_ni */
	LASSERT(peer_ni->ibp_connecting == 0);
	tunables = &peer_ni->ibp_ni->ni_lnd_tunables.lnd_tun_u.lnd_o2ib;
	peer_ni->ibp_connecting = tunables->lnd_conns_per_peer;

	/* always called with a ref on ni, which prevents ni being shutdown */
	LASSERT(((struct kib_net *)ni->ni_data)->ibn_shutdown == 0);

	if (tx != NULL)
		list_add_tail(&tx->tx_list, &peer_ni->ibp_tx_queue);

        kiblnd_peer_addref(peer_ni);
	list_add_tail(&peer_ni->ibp_list, kiblnd_nid2peerlist(nid));

	write_unlock_irqrestore(g_lock, flags);

	for (i = 0; i < tunables->lnd_conns_per_peer; i++)
		kiblnd_connect_peer(peer_ni);
        kiblnd_peer_decref(peer_ni);
}

int
kiblnd_send(struct lnet_ni *ni, void *private, struct lnet_msg *lntmsg)
{
	struct lnet_hdr *hdr = &lntmsg->msg_hdr;
	int               type = lntmsg->msg_type;
	struct lnet_process_id target = lntmsg->msg_target;
	int               target_is_router = lntmsg->msg_target_is_router;
	int               routing = lntmsg->msg_routing;
	unsigned int      payload_niov = lntmsg->msg_niov;
	struct kvec      *payload_iov = lntmsg->msg_iov;
	lnet_kiov_t      *payload_kiov = lntmsg->msg_kiov;
	unsigned int      payload_offset = lntmsg->msg_offset;
	unsigned int      payload_nob = lntmsg->msg_len;
	struct kib_msg *ibmsg;
	struct kib_rdma_desc *rd;
	struct kib_tx *tx;
	int               nob;
	int               rc;

        /* NB 'private' is different depending on what we're sending.... */

        CDEBUG(D_NET, "sending %d bytes in %d frags to %s\n",
               payload_nob, payload_niov, libcfs_id2str(target));

	LASSERT (payload_nob == 0 || payload_niov > 0);
	LASSERT (payload_niov <= LNET_MAX_IOV);

	/* Thread context */
	LASSERT (!in_interrupt());
	/* payload is either all vaddrs or all pages */
	LASSERT (!(payload_kiov != NULL && payload_iov != NULL));

	switch (type) {
	default:
		LBUG();
		return (-EIO);

        case LNET_MSG_ACK:
                LASSERT (payload_nob == 0);
                break;

        case LNET_MSG_GET:
                if (routing || target_is_router)
                        break;                  /* send IMMEDIATE */

                /* is the REPLY message too small for RDMA? */
		nob = offsetof(struct kib_msg, ibm_u.immediate.ibim_payload[lntmsg->msg_md->md_length]);
                if (nob <= IBLND_MSG_SIZE)
                        break;                  /* send IMMEDIATE */

		tx = kiblnd_get_idle_tx(ni, target.nid);
		if (tx == NULL) {
			CERROR("Can't allocate txd for GET to %s\n",
			       libcfs_nid2str(target.nid));
			return -ENOMEM;
		}

		ibmsg = tx->tx_msg;
		rd = &ibmsg->ibm_u.get.ibgm_rd;
		if ((lntmsg->msg_md->md_options & LNET_MD_KIOV) == 0)
			rc = kiblnd_setup_rd_iov(ni, tx, rd,
						 lntmsg->msg_md->md_niov,
						 lntmsg->msg_md->md_iov.iov,
						 0, lntmsg->msg_md->md_length);
		else
			rc = kiblnd_setup_rd_kiov(ni, tx, rd,
						  lntmsg->msg_md->md_niov,
						  lntmsg->msg_md->md_iov.kiov,
						  0, lntmsg->msg_md->md_length);
		if (rc != 0) {
			CERROR("Can't setup GET sink for %s: %d\n",
			       libcfs_nid2str(target.nid), rc);
			tx->tx_hstatus = LNET_MSG_STATUS_LOCAL_ERROR;
			kiblnd_tx_done(tx);
			return -EIO;
		}

		nob = offsetof(struct kib_get_msg, ibgm_rd.rd_frags[rd->rd_nfrags]);
		ibmsg->ibm_u.get.ibgm_cookie = tx->tx_cookie;
		ibmsg->ibm_u.get.ibgm_hdr = *hdr;

                kiblnd_init_tx_msg(ni, tx, IBLND_MSG_GET_REQ, nob);

                tx->tx_lntmsg[1] = lnet_create_reply_msg(ni, lntmsg);
		if (tx->tx_lntmsg[1] == NULL) {
			CERROR("Can't create reply for GET -> %s\n",
			       libcfs_nid2str(target.nid));
			kiblnd_tx_done(tx);
			return -EIO;
		}

                tx->tx_lntmsg[0] = lntmsg;      /* finalise lntmsg[0,1] on completion */
                tx->tx_waiting = 1;             /* waiting for GET_DONE */
                kiblnd_launch_tx(ni, tx, target.nid);
                return 0;

        case LNET_MSG_REPLY:
        case LNET_MSG_PUT:
                /* Is the payload small enough not to need RDMA? */
		nob = offsetof(struct kib_msg, ibm_u.immediate.ibim_payload[payload_nob]);
                if (nob <= IBLND_MSG_SIZE)
                        break;                  /* send IMMEDIATE */

		tx = kiblnd_get_idle_tx(ni, target.nid);
                if (tx == NULL) {
                        CERROR("Can't allocate %s txd for %s\n",
                               type == LNET_MSG_PUT ? "PUT" : "REPLY",
                               libcfs_nid2str(target.nid));
                        return -ENOMEM;
                }

                if (payload_kiov == NULL)
                        rc = kiblnd_setup_rd_iov(ni, tx, tx->tx_rd,
                                                 payload_niov, payload_iov,
                                                 payload_offset, payload_nob);
                else
                        rc = kiblnd_setup_rd_kiov(ni, tx, tx->tx_rd,
                                                  payload_niov, payload_kiov,
                                                  payload_offset, payload_nob);
		if (rc != 0) {
			CERROR("Can't setup PUT src for %s: %d\n",
			       libcfs_nid2str(target.nid), rc);
			kiblnd_tx_done(tx);
			return -EIO;
		}

                ibmsg = tx->tx_msg;
                ibmsg->ibm_u.putreq.ibprm_hdr = *hdr;
                ibmsg->ibm_u.putreq.ibprm_cookie = tx->tx_cookie;
		kiblnd_init_tx_msg(ni, tx, IBLND_MSG_PUT_REQ,
				   sizeof(struct kib_putreq_msg));

                tx->tx_lntmsg[0] = lntmsg;      /* finalise lntmsg on completion */
                tx->tx_waiting = 1;             /* waiting for PUT_{ACK,NAK} */
                kiblnd_launch_tx(ni, tx, target.nid);
                return 0;
        }

	/* send IMMEDIATE */
	LASSERT(offsetof(struct kib_msg, ibm_u.immediate.ibim_payload[payload_nob])
		<= IBLND_MSG_SIZE);

	tx = kiblnd_get_idle_tx(ni, target.nid);
        if (tx == NULL) {
                CERROR ("Can't send %d to %s: tx descs exhausted\n",
                        type, libcfs_nid2str(target.nid));
                return -ENOMEM;
        }

        ibmsg = tx->tx_msg;
        ibmsg->ibm_u.immediate.ibim_hdr = *hdr;

        if (payload_kiov != NULL)
                lnet_copy_kiov2flat(IBLND_MSG_SIZE, ibmsg,
				    offsetof(struct kib_msg, ibm_u.immediate.ibim_payload),
                                    payload_niov, payload_kiov,
                                    payload_offset, payload_nob);
        else
                lnet_copy_iov2flat(IBLND_MSG_SIZE, ibmsg,
				   offsetof(struct kib_msg, ibm_u.immediate.ibim_payload),
                                   payload_niov, payload_iov,
                                   payload_offset, payload_nob);

	nob = offsetof(struct kib_immediate_msg, ibim_payload[payload_nob]);
        kiblnd_init_tx_msg(ni, tx, IBLND_MSG_IMMEDIATE, nob);

        tx->tx_lntmsg[0] = lntmsg;              /* finalise lntmsg on completion */
        kiblnd_launch_tx(ni, tx, target.nid);
        return 0;
}

static void
kiblnd_reply(struct lnet_ni *ni, struct kib_rx *rx, struct lnet_msg *lntmsg)
{
	struct lnet_process_id target = lntmsg->msg_target;
        unsigned int      niov = lntmsg->msg_niov;
	struct kvec      *iov = lntmsg->msg_iov;
        lnet_kiov_t      *kiov = lntmsg->msg_kiov;
        unsigned int      offset = lntmsg->msg_offset;
        unsigned int      nob = lntmsg->msg_len;
	struct kib_tx *tx;
        int               rc;

	tx = kiblnd_get_idle_tx(ni, rx->rx_conn->ibc_peer->ibp_nid);
        if (tx == NULL) {
                CERROR("Can't get tx for REPLY to %s\n",
                       libcfs_nid2str(target.nid));
                goto failed_0;
        }

        if (nob == 0)
                rc = 0;
        else if (kiov == NULL)
                rc = kiblnd_setup_rd_iov(ni, tx, tx->tx_rd,
                                         niov, iov, offset, nob);
        else
                rc = kiblnd_setup_rd_kiov(ni, tx, tx->tx_rd,
                                          niov, kiov, offset, nob);

        if (rc != 0) {
                CERROR("Can't setup GET src for %s: %d\n",
                       libcfs_nid2str(target.nid), rc);
                goto failed_1;
        }

        rc = kiblnd_init_rdma(rx->rx_conn, tx,
                              IBLND_MSG_GET_DONE, nob,
                              &rx->rx_msg->ibm_u.get.ibgm_rd,
                              rx->rx_msg->ibm_u.get.ibgm_cookie);
        if (rc < 0) {
                CERROR("Can't setup rdma for GET from %s: %d\n",
                       libcfs_nid2str(target.nid), rc);
                goto failed_1;
        }

	if (nob == 0) {
		/* No RDMA: local completion may happen now! */
		lnet_finalize(lntmsg, 0);
	} else {
		/* RDMA: lnet_finalize(lntmsg) when it
		 * completes */
		tx->tx_lntmsg[0] = lntmsg;
	}

        kiblnd_queue_tx(tx, rx->rx_conn);
        return;


failed_1:
	tx->tx_hstatus = LNET_MSG_STATUS_LOCAL_ERROR;
	kiblnd_tx_done(tx);
failed_0:
	lnet_finalize(lntmsg, -EIO);
}

int
kiblnd_recv(struct lnet_ni *ni, void *private, struct lnet_msg *lntmsg,
	    int delayed, unsigned int niov, struct kvec *iov, lnet_kiov_t *kiov,
	    unsigned int offset, unsigned int mlen, unsigned int rlen)
{
	struct kib_rx *rx = private;
	struct kib_msg *rxmsg = rx->rx_msg;
	struct kib_conn *conn = rx->rx_conn;
	struct kib_tx *tx;
	__u64	     ibprm_cookie;
	int          nob;
	int          post_credit = IBLND_POSTRX_PEER_CREDIT;
	int          rc = 0;

	LASSERT (mlen <= rlen);
	LASSERT (!in_interrupt());
	/* Either all pages or all vaddrs */
	LASSERT (!(kiov != NULL && iov != NULL));

	switch (rxmsg->ibm_type) {
	default:
		LBUG();

        case IBLND_MSG_IMMEDIATE:
		nob = offsetof(struct kib_msg, ibm_u.immediate.ibim_payload[rlen]);
                if (nob > rx->rx_nob) {
                        CERROR ("Immediate message from %s too big: %d(%d)\n",
                                libcfs_nid2str(rxmsg->ibm_u.immediate.ibim_hdr.src_nid),
                                nob, rx->rx_nob);
                        rc = -EPROTO;
                        break;
                }

                if (kiov != NULL)
                        lnet_copy_flat2kiov(niov, kiov, offset,
                                            IBLND_MSG_SIZE, rxmsg,
					    offsetof(struct kib_msg, ibm_u.immediate.ibim_payload),
                                            mlen);
                else
                        lnet_copy_flat2iov(niov, iov, offset,
                                           IBLND_MSG_SIZE, rxmsg,
					   offsetof(struct kib_msg, ibm_u.immediate.ibim_payload),
                                           mlen);
		lnet_finalize(lntmsg, 0);
		break;

	case IBLND_MSG_PUT_REQ: {
		struct kib_msg	*txmsg;
		struct kib_rdma_desc *rd;
		ibprm_cookie = rxmsg->ibm_u.putreq.ibprm_cookie;

		if (mlen == 0) {
			lnet_finalize(lntmsg, 0);
			kiblnd_send_completion(rx->rx_conn, IBLND_MSG_PUT_NAK,
					       0, ibprm_cookie);
			break;
		}

		tx = kiblnd_get_idle_tx(ni, conn->ibc_peer->ibp_nid);
                if (tx == NULL) {
                        CERROR("Can't allocate tx for %s\n",
                               libcfs_nid2str(conn->ibc_peer->ibp_nid));
                        /* Not replying will break the connection */
                        rc = -ENOMEM;
                        break;
                }

		txmsg = tx->tx_msg;
		rd = &txmsg->ibm_u.putack.ibpam_rd;
		if (kiov == NULL)
			rc = kiblnd_setup_rd_iov(ni, tx, rd,
						 niov, iov, offset, mlen);
		else
			rc = kiblnd_setup_rd_kiov(ni, tx, rd,
						  niov, kiov, offset, mlen);
		if (rc != 0) {
			CERROR("Can't setup PUT sink for %s: %d\n",
			       libcfs_nid2str(conn->ibc_peer->ibp_nid), rc);
			tx->tx_hstatus = LNET_MSG_STATUS_LOCAL_ERROR;
			kiblnd_tx_done(tx);
			/* tell peer_ni it's over */
			kiblnd_send_completion(rx->rx_conn, IBLND_MSG_PUT_NAK,
					       rc, ibprm_cookie);
			break;
		}

		nob = offsetof(struct kib_putack_msg, ibpam_rd.rd_frags[rd->rd_nfrags]);
		txmsg->ibm_u.putack.ibpam_src_cookie = ibprm_cookie;
		txmsg->ibm_u.putack.ibpam_dst_cookie = tx->tx_cookie;

                kiblnd_init_tx_msg(ni, tx, IBLND_MSG_PUT_ACK, nob);

                tx->tx_lntmsg[0] = lntmsg;      /* finalise lntmsg on completion */
                tx->tx_waiting = 1;             /* waiting for PUT_DONE */
                kiblnd_queue_tx(tx, conn);

                /* reposted buffer reserved for PUT_DONE */
                post_credit = IBLND_POSTRX_NO_CREDIT;
                break;
		}

        case IBLND_MSG_GET_REQ:
                if (lntmsg != NULL) {
                        /* Optimized GET; RDMA lntmsg's payload */
                        kiblnd_reply(ni, rx, lntmsg);
                } else {
                        /* GET didn't match anything */
                        kiblnd_send_completion(rx->rx_conn, IBLND_MSG_GET_DONE,
                                               -ENODATA,
                                               rxmsg->ibm_u.get.ibgm_cookie);
                }
                break;
        }

        kiblnd_post_rx(rx, post_credit);
        return rc;
}

int
kiblnd_thread_start(int (*fn)(void *arg), void *arg, char *name)
{
	struct task_struct *task = kthread_run(fn, arg, name);

	if (IS_ERR(task))
		return PTR_ERR(task);

	atomic_inc(&kiblnd_data.kib_nthreads);
	return 0;
}

static void
kiblnd_thread_fini (void)
{
	atomic_dec (&kiblnd_data.kib_nthreads);
}

static void
kiblnd_peer_alive(struct kib_peer_ni *peer_ni)
{
	/* This is racy, but everyone's only writing ktime_get_seconds() */
	peer_ni->ibp_last_alive = ktime_get_seconds();
	smp_mb();
}

static void
kiblnd_peer_notify(struct kib_peer_ni *peer_ni)
{
	int           error = 0;
	time64_t last_alive = 0;
	unsigned long flags;

	read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);

	if (kiblnd_peer_idle(peer_ni) && peer_ni->ibp_error != 0) {
		error = peer_ni->ibp_error;
		peer_ni->ibp_error = 0;

		last_alive = peer_ni->ibp_last_alive;
	}

	read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);

	if (error != 0)
		lnet_notify(peer_ni->ibp_ni,
			    peer_ni->ibp_nid, false, false, last_alive);
}

void
kiblnd_close_conn_locked(struct kib_conn *conn, int error)
{
        /* This just does the immediate housekeeping.  'error' is zero for a
         * normal shutdown which can happen only after the connection has been
         * established.  If the connection is established, schedule the
         * connection to be finished off by the connd.  Otherwise the connd is
         * already dealing with it (either to set it up or tear it down).
         * Caller holds kib_global_lock exclusively in irq context */
	struct kib_peer_ni *peer_ni = conn->ibc_peer;
	struct kib_dev *dev;
	unsigned long flags;

        LASSERT (error != 0 || conn->ibc_state >= IBLND_CONN_ESTABLISHED);

        if (error != 0 && conn->ibc_comms_error == 0)
                conn->ibc_comms_error = error;

        if (conn->ibc_state != IBLND_CONN_ESTABLISHED)
                return; /* already being handled  */

        if (error == 0 &&
	    list_empty(&conn->ibc_tx_noops) &&
	    list_empty(&conn->ibc_tx_queue) &&
	    list_empty(&conn->ibc_tx_queue_rsrvd) &&
	    list_empty(&conn->ibc_tx_queue_nocred) &&
	    list_empty(&conn->ibc_active_txs)) {
                CDEBUG(D_NET, "closing conn to %s\n", 
                       libcfs_nid2str(peer_ni->ibp_nid));
        } else {
                CNETERR("Closing conn to %s: error %d%s%s%s%s%s\n",
                       libcfs_nid2str(peer_ni->ibp_nid), error,
		       list_empty(&conn->ibc_tx_queue) ? "" : "(sending)",
		       list_empty(&conn->ibc_tx_noops) ? "" : "(sending_noops)",
		       list_empty(&conn->ibc_tx_queue_rsrvd) ?
						"" : "(sending_rsrvd)",
		       list_empty(&conn->ibc_tx_queue_nocred) ?
						 "" : "(sending_nocred)",
		       list_empty(&conn->ibc_active_txs) ? "" : "(waiting)");
	}

	dev = ((struct kib_net *)peer_ni->ibp_ni->ni_data)->ibn_dev;
	if (peer_ni->ibp_next_conn == conn)
		/* clear next_conn so it won't be used */
		peer_ni->ibp_next_conn = NULL;
	list_del(&conn->ibc_list);
	/* connd (see below) takes over ibc_list's ref */

	if (list_empty(&peer_ni->ibp_conns) &&    /* no more conns */
            kiblnd_peer_active(peer_ni)) {         /* still in peer_ni table */
                kiblnd_unlink_peer_locked(peer_ni);

                /* set/clear error on last conn */
                peer_ni->ibp_error = conn->ibc_comms_error;
        }

        kiblnd_set_conn_state(conn, IBLND_CONN_CLOSING);

	if (error != 0 &&
	    kiblnd_dev_can_failover(dev)) {
		list_add_tail(&dev->ibd_fail_list,
			      &kiblnd_data.kib_failed_devs);
		wake_up(&kiblnd_data.kib_failover_waitq);
	}

	spin_lock_irqsave(&kiblnd_data.kib_connd_lock, flags);

	list_add_tail(&conn->ibc_list, &kiblnd_data.kib_connd_conns);
	wake_up(&kiblnd_data.kib_connd_waitq);

	spin_unlock_irqrestore(&kiblnd_data.kib_connd_lock, flags);
}

void
kiblnd_close_conn(struct kib_conn *conn, int error)
{
	unsigned long flags;

	write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);

	kiblnd_close_conn_locked(conn, error);

	write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
}

static void
kiblnd_handle_early_rxs(struct kib_conn *conn)
{
	unsigned long flags;
	struct kib_rx *rx;

	LASSERT(!in_interrupt());
	LASSERT(conn->ibc_state >= IBLND_CONN_ESTABLISHED);

	write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
	while (!list_empty(&conn->ibc_early_rxs)) {
		rx = list_entry(conn->ibc_early_rxs.next,
				struct kib_rx, rx_list);
		list_del(&rx->rx_list);
		write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);

		kiblnd_handle_rx(rx);

		write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
	}
	write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
}

void
kiblnd_abort_txs(struct kib_conn *conn, struct list_head *txs)
{
	LIST_HEAD(zombies);
	struct list_head	*tmp;
	struct list_head	*nxt;
	struct kib_tx *tx;

	spin_lock(&conn->ibc_lock);

	list_for_each_safe(tmp, nxt, txs) {
		tx = list_entry(tmp, struct kib_tx, tx_list);

		if (txs == &conn->ibc_active_txs) {
			LASSERT(!tx->tx_queued);
			LASSERT(tx->tx_waiting ||
				tx->tx_sending != 0);
			if (conn->ibc_comms_error == -ETIMEDOUT) {
				if (tx->tx_waiting && !tx->tx_sending)
					tx->tx_hstatus =
					  LNET_MSG_STATUS_REMOTE_TIMEOUT;
				else if (tx->tx_sending)
					tx->tx_hstatus =
					  LNET_MSG_STATUS_NETWORK_TIMEOUT;
			}
		} else {
			LASSERT(tx->tx_queued);
			if (conn->ibc_comms_error == -ETIMEDOUT)
				tx->tx_hstatus = LNET_MSG_STATUS_LOCAL_TIMEOUT;
			else
				tx->tx_hstatus = LNET_MSG_STATUS_LOCAL_ERROR;
		}

		tx->tx_status = -ECONNABORTED;
		tx->tx_waiting = 0;

		/*
		 * TODO: This makes an assumption that
		 * kiblnd_tx_complete() will be called for each tx. If
		 * that event is dropped we could end up with stale
		 * connections floating around. We'd like to deal with
		 * that in a better way.
		 *
		 * Also that means we can exceed the timeout by many
		 * seconds.
		 */
		if (tx->tx_sending == 0) {
			tx->tx_queued = 0;
			list_move(&tx->tx_list, &zombies);
		}
	}

	spin_unlock(&conn->ibc_lock);

	/*
	 * aborting transmits occurs when finalizing the connection.
	 * The connection is finalized on error.
	 * Passing LNET_MSG_STATUS_OK to txlist_done() will not
	 * override the value already set in tx->tx_hstatus above.
	 */
	kiblnd_txlist_done(&zombies, -ECONNABORTED, LNET_MSG_STATUS_OK);
}

static void
kiblnd_finalise_conn(struct kib_conn *conn)
{
	LASSERT (!in_interrupt());
	LASSERT (conn->ibc_state > IBLND_CONN_INIT);

	/* abort_receives moves QP state to IB_QPS_ERR.  This is only required
	 * for connections that didn't get as far as being connected, because
	 * rdma_disconnect() does this for free. */
	kiblnd_abort_receives(conn);

	kiblnd_set_conn_state(conn, IBLND_CONN_DISCONNECTED);

	/* Complete all tx descs not waiting for sends to complete.
	 * NB we should be safe from RDMA now that the QP has changed state */

	kiblnd_abort_txs(conn, &conn->ibc_tx_noops);
	kiblnd_abort_txs(conn, &conn->ibc_tx_queue);
	kiblnd_abort_txs(conn, &conn->ibc_tx_queue_rsrvd);
	kiblnd_abort_txs(conn, &conn->ibc_tx_queue_nocred);
	kiblnd_abort_txs(conn, &conn->ibc_active_txs);

	kiblnd_handle_early_rxs(conn);
}

static void
kiblnd_peer_connect_failed(struct kib_peer_ni *peer_ni, int active,
			   int error)
{
	LIST_HEAD(zombies);
	unsigned long	flags;

	LASSERT (error != 0);
	LASSERT (!in_interrupt());

	write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);

	if (active) {
		LASSERT(peer_ni->ibp_connecting > 0);
		peer_ni->ibp_connecting--;
	} else {
		LASSERT (peer_ni->ibp_accepting > 0);
		peer_ni->ibp_accepting--;
	}

	if (kiblnd_peer_connecting(peer_ni)) {
		/* another connection attempt under way... */
		write_unlock_irqrestore(&kiblnd_data.kib_global_lock,
					flags);
		return;
	}

	peer_ni->ibp_reconnected = 0;
	if (list_empty(&peer_ni->ibp_conns)) {
		/* Take peer_ni's blocked transmits to complete with error */
		list_splice_init(&peer_ni->ibp_tx_queue, &zombies);

		if (kiblnd_peer_active(peer_ni))
			kiblnd_unlink_peer_locked(peer_ni);

		peer_ni->ibp_error = error;
	} else {
		/* Can't have blocked transmits if there are connections */
		LASSERT(list_empty(&peer_ni->ibp_tx_queue));
	}

	write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);

	kiblnd_peer_notify(peer_ni);

	if (list_empty(&zombies))
		return;

	CNETERR("Deleting messages for %s: connection failed\n",
		libcfs_nid2str(peer_ni->ibp_nid));

	kiblnd_txlist_done(&zombies, error,
			   LNET_MSG_STATUS_LOCAL_DROPPED);
}

static void
kiblnd_connreq_done(struct kib_conn *conn, int status)
{
	struct kib_peer_ni *peer_ni = conn->ibc_peer;
	struct kib_tx *tx;
	LIST_HEAD(txs);
	unsigned long	 flags;
	int		 active;

        active = (conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT);

	CDEBUG(D_NET,"%s: active(%d), version(%x), status(%d)\n",
	       libcfs_nid2str(peer_ni->ibp_nid), active,
	       conn->ibc_version, status);

	LASSERT (!in_interrupt());
	LASSERT ((conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT &&
		  peer_ni->ibp_connecting > 0) ||
		 (conn->ibc_state == IBLND_CONN_PASSIVE_WAIT &&
		  peer_ni->ibp_accepting > 0));

        LIBCFS_FREE(conn->ibc_connvars, sizeof(*conn->ibc_connvars));
        conn->ibc_connvars = NULL;

        if (status != 0) {
                /* failed to establish connection */
                kiblnd_peer_connect_failed(peer_ni, active, status);
                kiblnd_finalise_conn(conn);
                return;
        }

        /* connection established */
	write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);

	conn->ibc_last_send = ktime_get();
        kiblnd_set_conn_state(conn, IBLND_CONN_ESTABLISHED);
        kiblnd_peer_alive(peer_ni);

	/* Add conn to peer_ni's list and nuke any dangling conns from a different
	 * peer_ni instance... */
	kiblnd_conn_addref(conn);	/* +1 ref for ibc_list */
	list_add(&conn->ibc_list, &peer_ni->ibp_conns);
	peer_ni->ibp_reconnected = 0;
	if (active)
		peer_ni->ibp_connecting--;
	else
		peer_ni->ibp_accepting--;

        if (peer_ni->ibp_version == 0) {
                peer_ni->ibp_version     = conn->ibc_version;
                peer_ni->ibp_incarnation = conn->ibc_incarnation;
        }

        if (peer_ni->ibp_version     != conn->ibc_version ||
            peer_ni->ibp_incarnation != conn->ibc_incarnation) {
                kiblnd_close_stale_conns_locked(peer_ni, conn->ibc_version,
                                                conn->ibc_incarnation);
                peer_ni->ibp_version     = conn->ibc_version;
                peer_ni->ibp_incarnation = conn->ibc_incarnation;
        }

	/* grab pending txs while I have the lock */
	list_splice_init(&peer_ni->ibp_tx_queue, &txs);

        if (!kiblnd_peer_active(peer_ni) ||        /* peer_ni has been deleted */
            conn->ibc_comms_error != 0) {       /* error has happened already */

                /* start to shut down connection */
                kiblnd_close_conn_locked(conn, -ECONNABORTED);
		write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);

		kiblnd_txlist_done(&txs, -ECONNABORTED,
				   LNET_MSG_STATUS_LOCAL_ERROR);

		return;
	}

	/* +1 ref for myself, this connection is visible to other threads
	 * now, refcount of peer:ibp_conns can be released by connection
	 * close from either a different thread, or the calling of
	 * kiblnd_check_sends_locked() below. See bz21911 for details.
	 */
	kiblnd_conn_addref(conn);
	write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);

	/* Schedule blocked txs
	 * Note: if we are running with conns_per_peer > 1, these blocked
	 * txs will all get scheduled to the first connection which gets
	 * scheduled.  We won't be using round robin on this first batch.
	 */
	spin_lock(&conn->ibc_lock);
	while (!list_empty(&txs)) {
		tx = list_entry(txs.next, struct kib_tx, tx_list);
		list_del(&tx->tx_list);

		kiblnd_queue_tx_locked(tx, conn);
	}
	kiblnd_check_sends_locked(conn);
	spin_unlock(&conn->ibc_lock);

	/* schedule blocked rxs */
	kiblnd_handle_early_rxs(conn);
	kiblnd_conn_decref(conn);
}

static void
kiblnd_reject(struct rdma_cm_id *cmid, struct kib_rej *rej)
{
        int          rc;

        rc = rdma_reject(cmid, rej, sizeof(*rej));

        if (rc != 0)
                CWARN("Error %d sending reject\n", rc);
}

static int
kiblnd_passive_connect(struct rdma_cm_id *cmid, void *priv, int priv_nob)
{
	rwlock_t		*g_lock = &kiblnd_data.kib_global_lock;
	struct kib_msg *reqmsg = priv;
	struct kib_msg *ackmsg;
	struct kib_dev *ibdev;
	struct kib_peer_ni *peer_ni;
	struct kib_peer_ni *peer2;
	struct kib_conn *conn;
	struct lnet_ni *ni = NULL;
	struct kib_net *net = NULL;
        lnet_nid_t             nid;
        struct rdma_conn_param cp;
	struct kib_rej rej;
	int                    version = IBLND_MSG_VERSION;
	unsigned long          flags;
	int                    rc;
	struct sockaddr_in    *peer_addr;
	LASSERT (!in_interrupt());

	/* cmid inherits 'context' from the corresponding listener id */
	ibdev = cmid->context;
	LASSERT(ibdev);

        memset(&rej, 0, sizeof(rej));
        rej.ibr_magic                = IBLND_MSG_MAGIC;
        rej.ibr_why                  = IBLND_REJECT_FATAL;
        rej.ibr_cp.ibcp_max_msg_size = IBLND_MSG_SIZE;

        peer_addr = (struct sockaddr_in *)&(cmid->route.addr.dst_addr);
        if (*kiblnd_tunables.kib_require_priv_port &&
            ntohs(peer_addr->sin_port) >= PROT_SOCK) {
		__u32 ip = ntohl(peer_addr->sin_addr.s_addr);
		CERROR("peer_ni's port (%pI4h:%hu) is not privileged\n",
		       &ip, ntohs(peer_addr->sin_port));
		goto failed;
	}

	if (priv_nob < offsetof(struct kib_msg, ibm_type)) {
		CERROR("Short connection request\n");
		goto failed;
	}

	/* Future protocol version compatibility support!  If the
	 * o2iblnd-specific protocol changes, or when LNET unifies
	 * protocols over all LNDs, the initial connection will
	 * negotiate a protocol version.  I trap this here to avoid
	 * console errors; the reject tells the peer_ni which protocol I
	 * speak. */
	if (reqmsg->ibm_magic == LNET_PROTO_MAGIC ||
	    reqmsg->ibm_magic == __swab32(LNET_PROTO_MAGIC))
		goto failed;
	if (reqmsg->ibm_magic == IBLND_MSG_MAGIC &&
	    reqmsg->ibm_version != IBLND_MSG_VERSION &&
	    reqmsg->ibm_version != IBLND_MSG_VERSION_1)
		goto failed;
	if (reqmsg->ibm_magic == __swab32(IBLND_MSG_MAGIC) &&
	    reqmsg->ibm_version != __swab16(IBLND_MSG_VERSION) &&
	    reqmsg->ibm_version != __swab16(IBLND_MSG_VERSION_1))
		goto failed;

	rc = kiblnd_unpack_msg(reqmsg, priv_nob);
	if (rc != 0) {
		CERROR("Can't parse connection request: %d\n", rc);
		goto failed;
	}

	nid = reqmsg->ibm_srcnid;
	ni  = lnet_nid2ni_addref(reqmsg->ibm_dstnid);

	if (ni != NULL) {
		net = (struct kib_net *)ni->ni_data;
		rej.ibr_incarnation = net->ibn_incarnation;
	}

	if (ni == NULL ||                         /* no matching net */
	    ni->ni_nid != reqmsg->ibm_dstnid ||   /* right NET, wrong NID! */
	    net->ibn_dev != ibdev) {              /* wrong device */
		CERROR("Can't accept conn from %s on %s (%s:%d:%pI4h): "
		       "bad dst nid %s\n", libcfs_nid2str(nid),
		       ni == NULL ? "NA" : libcfs_nid2str(ni->ni_nid),
		       ibdev->ibd_ifname, ibdev->ibd_nnets,
			&ibdev->ibd_ifip,
		       libcfs_nid2str(reqmsg->ibm_dstnid));

		goto failed;
	}

       /* check time stamp as soon as possible */
	if (reqmsg->ibm_dststamp != 0 &&
	    reqmsg->ibm_dststamp != net->ibn_incarnation) {
		CWARN("Stale connection request\n");
		rej.ibr_why = IBLND_REJECT_CONN_STALE;
		goto failed;
	}

	/* I can accept peer_ni's version */
	version = reqmsg->ibm_version;

	if (reqmsg->ibm_type != IBLND_MSG_CONNREQ) {
		CERROR("Unexpected connreq msg type: %x from %s\n",
		       reqmsg->ibm_type, libcfs_nid2str(nid));
		goto failed;
	}

	if (reqmsg->ibm_u.connparams.ibcp_queue_depth >
	    kiblnd_msg_queue_size(version, ni)) {
		CERROR("Can't accept conn from %s, queue depth too large: "
		       " %d (<=%d wanted)\n",
		       libcfs_nid2str(nid),
		       reqmsg->ibm_u.connparams.ibcp_queue_depth,
		       kiblnd_msg_queue_size(version, ni));

		if (version == IBLND_MSG_VERSION)
			rej.ibr_why = IBLND_REJECT_MSG_QUEUE_SIZE;

		goto failed;
	}

	if (reqmsg->ibm_u.connparams.ibcp_max_frags >
	    IBLND_MAX_RDMA_FRAGS) {
		CWARN("Can't accept conn from %s (version %x): "
		      "max_frags %d too large (%d wanted)\n",
		      libcfs_nid2str(nid), version,
		      reqmsg->ibm_u.connparams.ibcp_max_frags,
		      IBLND_MAX_RDMA_FRAGS);

		if (version >= IBLND_MSG_VERSION)
			rej.ibr_why = IBLND_REJECT_RDMA_FRAGS;

		goto failed;
	} else if (reqmsg->ibm_u.connparams.ibcp_max_frags <
		   IBLND_MAX_RDMA_FRAGS &&
		   net->ibn_fmr_ps == NULL) {
		CWARN("Can't accept conn from %s (version %x): "
		      "max_frags %d incompatible without FMR pool "
		      "(%d wanted)\n",
		      libcfs_nid2str(nid), version,
		      reqmsg->ibm_u.connparams.ibcp_max_frags,
		      IBLND_MAX_RDMA_FRAGS);

		if (version == IBLND_MSG_VERSION)
			rej.ibr_why = IBLND_REJECT_RDMA_FRAGS;

		goto failed;
	}

        if (reqmsg->ibm_u.connparams.ibcp_max_msg_size > IBLND_MSG_SIZE) {
                CERROR("Can't accept %s: message size %d too big (%d max)\n",
                       libcfs_nid2str(nid),
                       reqmsg->ibm_u.connparams.ibcp_max_msg_size,
                       IBLND_MSG_SIZE);
                goto failed;
        }

	/* assume 'nid' is a new peer_ni; create  */
	rc = kiblnd_create_peer(ni, &peer_ni, nid);
	if (rc != 0) {
		CERROR("Can't create peer_ni for %s\n", libcfs_nid2str(nid));
		rej.ibr_why = IBLND_REJECT_NO_RESOURCES;
		goto failed;
	}

	/* We have validated the peer's parameters so use those */
	peer_ni->ibp_max_frags = reqmsg->ibm_u.connparams.ibcp_max_frags;
	peer_ni->ibp_queue_depth = reqmsg->ibm_u.connparams.ibcp_queue_depth;

	write_lock_irqsave(g_lock, flags);

        peer2 = kiblnd_find_peer_locked(ni, nid);
        if (peer2 != NULL) {
                if (peer2->ibp_version == 0) {
                        peer2->ibp_version     = version;
                        peer2->ibp_incarnation = reqmsg->ibm_srcstamp;
                }

                /* not the guy I've talked with */
                if (peer2->ibp_incarnation != reqmsg->ibm_srcstamp ||
                    peer2->ibp_version     != version) {
			kiblnd_close_peer_conns_locked(peer2, -ESTALE);

			if (kiblnd_peer_active(peer2)) {
				peer2->ibp_incarnation = reqmsg->ibm_srcstamp;
				peer2->ibp_version = version;
			}
			write_unlock_irqrestore(g_lock, flags);

			CWARN("Conn stale %s version %x/%x incarnation %llu/%llu\n",
			      libcfs_nid2str(nid), peer2->ibp_version, version,
			      peer2->ibp_incarnation, reqmsg->ibm_srcstamp);

                        kiblnd_peer_decref(peer_ni);
                        rej.ibr_why = IBLND_REJECT_CONN_STALE;
                        goto failed;
                }

		/* Tie-break connection race in favour of the higher NID.
		 * If we keep running into a race condition multiple times,
		 * we have to assume that the connection attempt with the
		 * higher NID is stuck in a connecting state and will never
		 * recover.  As such, we pass through this if-block and let
		 * the lower NID connection win so we can move forward.
		 */
		if (peer2->ibp_connecting != 0 &&
		    nid < ni->ni_nid && peer2->ibp_races <
		    MAX_CONN_RACES_BEFORE_ABORT) {
			peer2->ibp_races++;
			write_unlock_irqrestore(g_lock, flags);

			CDEBUG(D_NET, "Conn race %s\n",
			       libcfs_nid2str(peer2->ibp_nid));

			kiblnd_peer_decref(peer_ni);
			rej.ibr_why = IBLND_REJECT_CONN_RACE;
			goto failed;
		}
		if (peer2->ibp_races >= MAX_CONN_RACES_BEFORE_ABORT)
			CNETERR("Conn race %s: unresolved after %d attempts, letting lower NID win\n",
				libcfs_nid2str(peer2->ibp_nid),
				MAX_CONN_RACES_BEFORE_ABORT);
		/*
		 * passive connection is allowed even this peer_ni is waiting for
		 * reconnection.
		 */
		peer2->ibp_reconnecting = 0;
		peer2->ibp_races = 0;
		peer2->ibp_accepting++;
		kiblnd_peer_addref(peer2);

		/* Race with kiblnd_launch_tx (active connect) to create peer_ni
		 * so copy validated parameters since we now know what the
		 * peer_ni's limits are */
		peer2->ibp_max_frags = peer_ni->ibp_max_frags;
		peer2->ibp_queue_depth = peer_ni->ibp_queue_depth;

		write_unlock_irqrestore(g_lock, flags);
                kiblnd_peer_decref(peer_ni);
                peer_ni = peer2;
        } else {
                /* Brand new peer_ni */
                LASSERT (peer_ni->ibp_accepting == 0);
                LASSERT (peer_ni->ibp_version == 0 &&
                         peer_ni->ibp_incarnation == 0);

                peer_ni->ibp_accepting   = 1;
                peer_ni->ibp_version     = version;
                peer_ni->ibp_incarnation = reqmsg->ibm_srcstamp;

                /* I have a ref on ni that prevents it being shutdown */
                LASSERT (net->ibn_shutdown == 0);

                kiblnd_peer_addref(peer_ni);
		list_add_tail(&peer_ni->ibp_list, kiblnd_nid2peerlist(nid));

		write_unlock_irqrestore(g_lock, flags);
        }

	conn = kiblnd_create_conn(peer_ni, cmid, IBLND_CONN_PASSIVE_WAIT, version);
        if (conn == NULL) {
                kiblnd_peer_connect_failed(peer_ni, 0, -ENOMEM);
                kiblnd_peer_decref(peer_ni);
                rej.ibr_why = IBLND_REJECT_NO_RESOURCES;
                goto failed;
        }

        /* conn now "owns" cmid, so I return success from here on to ensure the
         * CM callback doesn't destroy cmid. */
	conn->ibc_incarnation      = reqmsg->ibm_srcstamp;
	conn->ibc_credits          = conn->ibc_queue_depth;
	conn->ibc_reserved_credits = conn->ibc_queue_depth;
	LASSERT(conn->ibc_credits + conn->ibc_reserved_credits +
		IBLND_OOB_MSGS(version) <= IBLND_RX_MSGS(conn));

        ackmsg = &conn->ibc_connvars->cv_msg;
        memset(ackmsg, 0, sizeof(*ackmsg));

        kiblnd_init_msg(ackmsg, IBLND_MSG_CONNACK,
                        sizeof(ackmsg->ibm_u.connparams));
	ackmsg->ibm_u.connparams.ibcp_queue_depth  = conn->ibc_queue_depth;
	ackmsg->ibm_u.connparams.ibcp_max_frags    = conn->ibc_max_frags;
	ackmsg->ibm_u.connparams.ibcp_max_msg_size = IBLND_MSG_SIZE;

        kiblnd_pack_msg(ni, ackmsg, version, 0, nid, reqmsg->ibm_srcstamp);

        memset(&cp, 0, sizeof(cp));
        cp.private_data        = ackmsg;
        cp.private_data_len    = ackmsg->ibm_nob;
        cp.responder_resources = 0;             /* No atomic ops or RDMA reads */
        cp.initiator_depth     = 0;
        cp.flow_control        = 1;
        cp.retry_count         = *kiblnd_tunables.kib_retry_count;
        cp.rnr_retry_count     = *kiblnd_tunables.kib_rnr_retry_count;

        CDEBUG(D_NET, "Accept %s\n", libcfs_nid2str(nid));

        rc = rdma_accept(cmid, &cp);
        if (rc != 0) {
                CERROR("Can't accept %s: %d\n", libcfs_nid2str(nid), rc);
                rej.ibr_version = version;
                rej.ibr_why     = IBLND_REJECT_FATAL;

                kiblnd_reject(cmid, &rej);
                kiblnd_connreq_done(conn, rc);
                kiblnd_conn_decref(conn);
        }

        lnet_ni_decref(ni);
        return 0;

 failed:
	if (ni != NULL) {
		rej.ibr_cp.ibcp_queue_depth =
			kiblnd_msg_queue_size(version, ni);
		rej.ibr_cp.ibcp_max_frags   = IBLND_MAX_RDMA_FRAGS;
		lnet_ni_decref(ni);
	}

	rej.ibr_version = version;
	kiblnd_reject(cmid, &rej);

	return -ECONNREFUSED;
}

static void
kiblnd_check_reconnect(struct kib_conn *conn, int version,
		       u64 incarnation, int why, struct kib_connparams *cp)
{
	rwlock_t	*glock = &kiblnd_data.kib_global_lock;
	struct kib_peer_ni *peer_ni = conn->ibc_peer;
	char		*reason;
	int		 msg_size = IBLND_MSG_SIZE;
	int		 frag_num = -1;
	int		 queue_dep = -1;
	bool		 reconnect;
	unsigned long	 flags;

	LASSERT(conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT);
	LASSERT(peer_ni->ibp_connecting > 0);	/* 'conn' at least */

	if (cp) {
		msg_size	= cp->ibcp_max_msg_size;
		frag_num	= cp->ibcp_max_frags;
		queue_dep	= cp->ibcp_queue_depth;
	}

	write_lock_irqsave(glock, flags);
	/* retry connection if it's still needed and no other connection
	 * attempts (active or passive) are in progress
	 * NB: reconnect is still needed even when ibp_tx_queue is
	 * empty if ibp_version != version because reconnect may be
	 * initiated.
	 */
	reconnect = (!list_empty(&peer_ni->ibp_tx_queue) ||
		     peer_ni->ibp_version != version) &&
		    peer_ni->ibp_connecting &&
		    peer_ni->ibp_accepting == 0;
	if (!reconnect) {
		reason = "no need";
		goto out;
	}

        switch (why) {
        default:
                reason = "Unknown";
                break;

	case IBLND_REJECT_RDMA_FRAGS: {
		struct lnet_ioctl_config_o2iblnd_tunables *tunables;

		if (!cp) {
			reason = "can't negotiate max frags";
			goto out;
		}
		tunables = &peer_ni->ibp_ni->ni_lnd_tunables.lnd_tun_u.lnd_o2ib;
#ifdef HAVE_IB_GET_DMA_MR
		/*
		 * This check only makes sense if the kernel supports global
		 * memory registration. Otherwise, map_on_demand will never == 0
		 */
		if (!tunables->lnd_map_on_demand) {
			reason = "map_on_demand must be enabled";
			goto out;
		}
#endif
		if (conn->ibc_max_frags <= frag_num) {
			reason = "unsupported max frags";
			goto out;
		}

		peer_ni->ibp_max_frags = frag_num;
		reason = "rdma fragments";
		break;
	}
	case IBLND_REJECT_MSG_QUEUE_SIZE:
		if (!cp) {
			reason = "can't negotiate queue depth";
			goto out;
		}
		if (conn->ibc_queue_depth <= queue_dep) {
			reason = "unsupported queue depth";
			goto out;
		}

		peer_ni->ibp_queue_depth = queue_dep;
		reason = "queue depth";
		break;

        case IBLND_REJECT_CONN_STALE:
                reason = "stale";
                break;

        case IBLND_REJECT_CONN_RACE:
                reason = "conn race";
                break;

        case IBLND_REJECT_CONN_UNCOMPAT:
                reason = "version negotiation";
                break;

	case IBLND_REJECT_INVALID_SRV_ID:
		reason = "invalid service id";
		break;
        }

	conn->ibc_reconnect = 1;
	peer_ni->ibp_reconnecting++;
	peer_ni->ibp_version = version;
	if (incarnation != 0)
		peer_ni->ibp_incarnation = incarnation;
 out:
	write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);

	CNETERR("%s: %s (%s), %x, %x, msg_size: %d, queue_depth: %d/%d, max_frags: %d/%d\n",
		libcfs_nid2str(peer_ni->ibp_nid),
		reconnect ? "reconnect" : "don't reconnect",
		reason, IBLND_MSG_VERSION, version, msg_size,
		conn->ibc_queue_depth, queue_dep,
		conn->ibc_max_frags, frag_num);
	/*
	 * if conn::ibc_reconnect is TRUE, connd will reconnect to the peer_ni
	 * while destroying the zombie
	 */
}

static void
kiblnd_rejected(struct kib_conn *conn, int reason, void *priv, int priv_nob)
{
	struct kib_peer_ni *peer_ni = conn->ibc_peer;

	LASSERT (!in_interrupt());
	LASSERT (conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT);

	switch (reason) {
	case IB_CM_REJ_STALE_CONN:
		kiblnd_check_reconnect(conn, IBLND_MSG_VERSION, 0,
				       IBLND_REJECT_CONN_STALE, NULL);
		break;

        case IB_CM_REJ_INVALID_SERVICE_ID:
		kiblnd_check_reconnect(conn, IBLND_MSG_VERSION, 0,
				       IBLND_REJECT_INVALID_SRV_ID, NULL);
                CNETERR("%s rejected: no listener at %d\n",
                        libcfs_nid2str(peer_ni->ibp_nid),
                        *kiblnd_tunables.kib_service);
                break;

        case IB_CM_REJ_CONSUMER_DEFINED:
		if (priv_nob >= offsetof(struct kib_rej, ibr_padding)) {
			struct kib_rej *rej = priv;
			struct kib_connparams *cp = NULL;
                        int               flip        = 0;
                        __u64             incarnation = -1;

                        /* NB. default incarnation is -1 because:
                         * a) V1 will ignore dst incarnation in connreq.
                         * b) V2 will provide incarnation while rejecting me,
                         *    -1 will be overwrote.
                         *
                         * if I try to connect to a V1 peer_ni with V2 protocol,
                         * it rejected me then upgrade to V2, I have no idea
                         * about the upgrading and try to reconnect with V1,
                         * in this case upgraded V2 can find out I'm trying to
                         * talk to the old guy and reject me(incarnation is -1). 
                         */

                        if (rej->ibr_magic == __swab32(IBLND_MSG_MAGIC) ||
                            rej->ibr_magic == __swab32(LNET_PROTO_MAGIC)) {
                                __swab32s(&rej->ibr_magic);
                                __swab16s(&rej->ibr_version);
                                flip = 1;
                        }

			if (priv_nob >= sizeof(struct kib_rej) &&
                            rej->ibr_version > IBLND_MSG_VERSION_1) {
                                /* priv_nob is always 148 in current version
                                 * of OFED, so we still need to check version.
                                 * (define of IB_CM_REJ_PRIVATE_DATA_SIZE) */
                                cp = &rej->ibr_cp;

                                if (flip) {
                                        __swab64s(&rej->ibr_incarnation);
                                        __swab16s(&cp->ibcp_queue_depth);
                                        __swab16s(&cp->ibcp_max_frags);
                                        __swab32s(&cp->ibcp_max_msg_size);
                                }

                                incarnation = rej->ibr_incarnation;
                        }

                        if (rej->ibr_magic != IBLND_MSG_MAGIC &&
                            rej->ibr_magic != LNET_PROTO_MAGIC) {
                                CERROR("%s rejected: consumer defined fatal error\n",
                                       libcfs_nid2str(peer_ni->ibp_nid));
                                break;
                        }

                        if (rej->ibr_version != IBLND_MSG_VERSION &&
                            rej->ibr_version != IBLND_MSG_VERSION_1) {
                                CERROR("%s rejected: o2iblnd version %x error\n",
                                       libcfs_nid2str(peer_ni->ibp_nid),
                                       rej->ibr_version);
                                break;
                        }

                        if (rej->ibr_why     == IBLND_REJECT_FATAL &&
                            rej->ibr_version == IBLND_MSG_VERSION_1) {
                                CDEBUG(D_NET, "rejected by old version peer_ni %s: %x\n",
                                       libcfs_nid2str(peer_ni->ibp_nid), rej->ibr_version);

                                if (conn->ibc_version != IBLND_MSG_VERSION_1)
                                        rej->ibr_why = IBLND_REJECT_CONN_UNCOMPAT;
                        }

                        switch (rej->ibr_why) {
                        case IBLND_REJECT_CONN_RACE:
                        case IBLND_REJECT_CONN_STALE:
                        case IBLND_REJECT_CONN_UNCOMPAT:
			case IBLND_REJECT_MSG_QUEUE_SIZE:
			case IBLND_REJECT_RDMA_FRAGS:
				kiblnd_check_reconnect(conn, rej->ibr_version,
						incarnation, rej->ibr_why, cp);
                                break;

                        case IBLND_REJECT_NO_RESOURCES:
                                CERROR("%s rejected: o2iblnd no resources\n",
                                       libcfs_nid2str(peer_ni->ibp_nid));
                                break;

                        case IBLND_REJECT_FATAL:
                                CERROR("%s rejected: o2iblnd fatal error\n",
                                       libcfs_nid2str(peer_ni->ibp_nid));
                                break;

                        default:
                                CERROR("%s rejected: o2iblnd reason %d\n",
                                       libcfs_nid2str(peer_ni->ibp_nid),
                                       rej->ibr_why);
                                break;
                        }
                        break;
                }
                /* fall through */
        default:
                CNETERR("%s rejected: reason %d, size %d\n",
                        libcfs_nid2str(peer_ni->ibp_nid), reason, priv_nob);
                break;
        }

        kiblnd_connreq_done(conn, -ECONNREFUSED);
}

static void
kiblnd_check_connreply(struct kib_conn *conn, void *priv, int priv_nob)
{
	struct kib_peer_ni *peer_ni = conn->ibc_peer;
	struct lnet_ni *ni = peer_ni->ibp_ni;
	struct kib_net *net = ni->ni_data;
	struct kib_msg *msg = priv;
        int            ver  = conn->ibc_version;
        int            rc   = kiblnd_unpack_msg(msg, priv_nob);
        unsigned long  flags;

        LASSERT (net != NULL);

        if (rc != 0) {
                CERROR("Can't unpack connack from %s: %d\n",
                       libcfs_nid2str(peer_ni->ibp_nid), rc);
                goto failed;
        }

        if (msg->ibm_type != IBLND_MSG_CONNACK) {
                CERROR("Unexpected message %d from %s\n",
                       msg->ibm_type, libcfs_nid2str(peer_ni->ibp_nid));
                rc = -EPROTO;
                goto failed;
        }

        if (ver != msg->ibm_version) {
                CERROR("%s replied version %x is different with "
                       "requested version %x\n",
                       libcfs_nid2str(peer_ni->ibp_nid), msg->ibm_version, ver);
                rc = -EPROTO;
                goto failed;
        }

	if (msg->ibm_u.connparams.ibcp_queue_depth >
	    conn->ibc_queue_depth) {
		CERROR("%s has incompatible queue depth %d (<=%d wanted)\n",
		       libcfs_nid2str(peer_ni->ibp_nid),
		       msg->ibm_u.connparams.ibcp_queue_depth,
		       conn->ibc_queue_depth);
		rc = -EPROTO;
		goto failed;
	}

	if (msg->ibm_u.connparams.ibcp_max_frags >
	    conn->ibc_max_frags) {
		CERROR("%s has incompatible max_frags %d (<=%d wanted)\n",
		       libcfs_nid2str(peer_ni->ibp_nid),
		       msg->ibm_u.connparams.ibcp_max_frags,
		       conn->ibc_max_frags);
		rc = -EPROTO;
		goto failed;
	}

        if (msg->ibm_u.connparams.ibcp_max_msg_size > IBLND_MSG_SIZE) {
                CERROR("%s max message size %d too big (%d max)\n",
                       libcfs_nid2str(peer_ni->ibp_nid),
                       msg->ibm_u.connparams.ibcp_max_msg_size,
                       IBLND_MSG_SIZE);
                rc = -EPROTO;
                goto failed;
        }

	read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
	if (msg->ibm_dstnid == ni->ni_nid &&
	    msg->ibm_dststamp == net->ibn_incarnation)
		rc = 0;
	else
		rc = -ESTALE;
	read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);

        if (rc != 0) {
                CERROR("Bad connection reply from %s, rc = %d, "
                       "version: %x max_frags: %d\n",
                       libcfs_nid2str(peer_ni->ibp_nid), rc,
                       msg->ibm_version, msg->ibm_u.connparams.ibcp_max_frags);
                goto failed;
        }

	conn->ibc_incarnation      = msg->ibm_srcstamp;
	conn->ibc_credits          = msg->ibm_u.connparams.ibcp_queue_depth;
	conn->ibc_reserved_credits = msg->ibm_u.connparams.ibcp_queue_depth;
	conn->ibc_queue_depth      = msg->ibm_u.connparams.ibcp_queue_depth;
	conn->ibc_max_frags        = msg->ibm_u.connparams.ibcp_max_frags;
	LASSERT(conn->ibc_credits + conn->ibc_reserved_credits +
		IBLND_OOB_MSGS(ver) <= IBLND_RX_MSGS(conn));

        kiblnd_connreq_done(conn, 0);
        return;

 failed:
        /* NB My QP has already established itself, so I handle anything going
         * wrong here by setting ibc_comms_error.
         * kiblnd_connreq_done(0) moves the conn state to ESTABLISHED, but then
         * immediately tears it down. */

        LASSERT (rc != 0);
        conn->ibc_comms_error = rc;
        kiblnd_connreq_done(conn, 0);
}

static int
kiblnd_active_connect(struct rdma_cm_id *cmid)
{
	struct kib_peer_ni *peer_ni = cmid->context;
	struct kib_conn *conn;
	struct kib_msg *msg;
	struct rdma_conn_param cp;
        int                      version;
        __u64                    incarnation;
        unsigned long            flags;
        int                      rc;

	read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);

	incarnation = peer_ni->ibp_incarnation;
	version     = (peer_ni->ibp_version == 0) ? IBLND_MSG_VERSION :
						 peer_ni->ibp_version;

	read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);

	conn = kiblnd_create_conn(peer_ni, cmid, IBLND_CONN_ACTIVE_CONNECT,
				  version);
        if (conn == NULL) {
                kiblnd_peer_connect_failed(peer_ni, 1, -ENOMEM);
                kiblnd_peer_decref(peer_ni); /* lose cmid's ref */
                return -ENOMEM;
        }

        /* conn "owns" cmid now, so I return success from here on to ensure the
         * CM callback doesn't destroy cmid. conn also takes over cmid's ref
         * on peer_ni */

        msg = &conn->ibc_connvars->cv_msg;

	memset(msg, 0, sizeof(*msg));
	kiblnd_init_msg(msg, IBLND_MSG_CONNREQ, sizeof(msg->ibm_u.connparams));
	msg->ibm_u.connparams.ibcp_queue_depth  = conn->ibc_queue_depth;
	msg->ibm_u.connparams.ibcp_max_frags    = conn->ibc_max_frags;
	msg->ibm_u.connparams.ibcp_max_msg_size = IBLND_MSG_SIZE;

        kiblnd_pack_msg(peer_ni->ibp_ni, msg, version,
                        0, peer_ni->ibp_nid, incarnation);

        memset(&cp, 0, sizeof(cp));
        cp.private_data        = msg;
        cp.private_data_len    = msg->ibm_nob;
        cp.responder_resources = 0;             /* No atomic ops or RDMA reads */
        cp.initiator_depth     = 0;
        cp.flow_control        = 1;
        cp.retry_count         = *kiblnd_tunables.kib_retry_count;
        cp.rnr_retry_count     = *kiblnd_tunables.kib_rnr_retry_count;

        LASSERT(cmid->context == (void *)conn);
        LASSERT(conn->ibc_cmid == cmid);

        rc = rdma_connect(cmid, &cp);
        if (rc != 0) {
                CERROR("Can't connect to %s: %d\n",
                       libcfs_nid2str(peer_ni->ibp_nid), rc);
                kiblnd_connreq_done(conn, rc);
                kiblnd_conn_decref(conn);
        }

        return 0;
}

int
kiblnd_cm_callback(struct rdma_cm_id *cmid, struct rdma_cm_event *event)
{
	struct kib_peer_ni *peer_ni;
	struct kib_conn *conn;
	int rc;

	switch (event->event) {
	default:
                CERROR("Unexpected event: %d, status: %d\n",
                       event->event, event->status);
                LBUG();

	case RDMA_CM_EVENT_CONNECT_REQUEST:
                /* destroy cmid on failure */
		rc = kiblnd_passive_connect(cmid,
                                            (void *)KIBLND_CONN_PARAM(event),
                                            KIBLND_CONN_PARAM_LEN(event));
                CDEBUG(D_NET, "connreq: %d\n", rc);
                return rc;

	case RDMA_CM_EVENT_ADDR_ERROR:
		peer_ni = cmid->context;
                CNETERR("%s: ADDR ERROR %d\n",
                       libcfs_nid2str(peer_ni->ibp_nid), event->status);
                kiblnd_peer_connect_failed(peer_ni, 1, -EHOSTUNREACH);
                kiblnd_peer_decref(peer_ni);
                return -EHOSTUNREACH;      /* rc != 0 destroys cmid */

	case RDMA_CM_EVENT_ADDR_RESOLVED:
		peer_ni = cmid->context;

                CDEBUG(D_NET,"%s Addr resolved: %d\n",
                       libcfs_nid2str(peer_ni->ibp_nid), event->status);

                if (event->status != 0) {
                        CNETERR("Can't resolve address for %s: %d\n",
                                libcfs_nid2str(peer_ni->ibp_nid), event->status);
                        rc = event->status;
		} else {
			rc = rdma_resolve_route(
				cmid, lnet_get_lnd_timeout() * 1000);
			if (rc == 0) {
				struct kib_net *net = peer_ni->ibp_ni->ni_data;
				struct kib_dev *dev = net->ibn_dev;

				CDEBUG(D_NET, "%s: connection bound to "\
				       "%s:%pI4h:%s\n",
				       libcfs_nid2str(peer_ni->ibp_nid),
				       dev->ibd_ifname,
				       &dev->ibd_ifip, cmid->device->name);

				return 0;
			}

                        /* Can't initiate route resolution */
                        CERROR("Can't resolve route for %s: %d\n",
                               libcfs_nid2str(peer_ni->ibp_nid), rc);
                }
                kiblnd_peer_connect_failed(peer_ni, 1, rc);
                kiblnd_peer_decref(peer_ni);
                return rc;                      /* rc != 0 destroys cmid */

	case RDMA_CM_EVENT_ROUTE_ERROR:
		peer_ni = cmid->context;
                CNETERR("%s: ROUTE ERROR %d\n",
                        libcfs_nid2str(peer_ni->ibp_nid), event->status);
                kiblnd_peer_connect_failed(peer_ni, 1, -EHOSTUNREACH);
                kiblnd_peer_decref(peer_ni);
                return -EHOSTUNREACH;           /* rc != 0 destroys cmid */

	case RDMA_CM_EVENT_ROUTE_RESOLVED:
		peer_ni = cmid->context;
                CDEBUG(D_NET,"%s Route resolved: %d\n",
                       libcfs_nid2str(peer_ni->ibp_nid), event->status);

                if (event->status == 0)
                        return kiblnd_active_connect(cmid);

                CNETERR("Can't resolve route for %s: %d\n",
                       libcfs_nid2str(peer_ni->ibp_nid), event->status);
                kiblnd_peer_connect_failed(peer_ni, 1, event->status);
                kiblnd_peer_decref(peer_ni);
                return event->status;           /* rc != 0 destroys cmid */

	case RDMA_CM_EVENT_UNREACHABLE:
		conn = cmid->context;
                LASSERT(conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT ||
                        conn->ibc_state == IBLND_CONN_PASSIVE_WAIT);
                CNETERR("%s: UNREACHABLE %d\n",
                       libcfs_nid2str(conn->ibc_peer->ibp_nid), event->status);
                kiblnd_connreq_done(conn, -ENETDOWN);
                kiblnd_conn_decref(conn);
                return 0;

	case RDMA_CM_EVENT_CONNECT_ERROR:
		conn = cmid->context;
                LASSERT(conn->ibc_state == IBLND_CONN_ACTIVE_CONNECT ||
                        conn->ibc_state == IBLND_CONN_PASSIVE_WAIT);
                CNETERR("%s: CONNECT ERROR %d\n",
                        libcfs_nid2str(conn->ibc_peer->ibp_nid), event->status);
                kiblnd_connreq_done(conn, -ENOTCONN);
                kiblnd_conn_decref(conn);
                return 0;

	case RDMA_CM_EVENT_REJECTED:
		conn = cmid->context;
                switch (conn->ibc_state) {
                default:
                        LBUG();

                case IBLND_CONN_PASSIVE_WAIT:
                        CERROR ("%s: REJECTED %d\n",
                                libcfs_nid2str(conn->ibc_peer->ibp_nid),
                                event->status);
                        kiblnd_connreq_done(conn, -ECONNRESET);
                        break;

                case IBLND_CONN_ACTIVE_CONNECT:
                        kiblnd_rejected(conn, event->status,
                                        (void *)KIBLND_CONN_PARAM(event),
                                        KIBLND_CONN_PARAM_LEN(event));
                        break;
                }
                kiblnd_conn_decref(conn);
                return 0;

	case RDMA_CM_EVENT_ESTABLISHED:
		conn = cmid->context;
                switch (conn->ibc_state) {
                default:
                        LBUG();

                case IBLND_CONN_PASSIVE_WAIT:
                        CDEBUG(D_NET, "ESTABLISHED (passive): %s\n",
                               libcfs_nid2str(conn->ibc_peer->ibp_nid));
                        kiblnd_connreq_done(conn, 0);
                        break;

                case IBLND_CONN_ACTIVE_CONNECT:
                        CDEBUG(D_NET, "ESTABLISHED(active): %s\n",
                               libcfs_nid2str(conn->ibc_peer->ibp_nid));
                        kiblnd_check_connreply(conn,
                                               (void *)KIBLND_CONN_PARAM(event),
                                               KIBLND_CONN_PARAM_LEN(event));
                        break;
                }
                /* net keeps its ref on conn! */
                return 0;

        case RDMA_CM_EVENT_TIMEWAIT_EXIT:
                CDEBUG(D_NET, "Ignore TIMEWAIT_EXIT event\n");
                return 0;

	case RDMA_CM_EVENT_DISCONNECTED:
		conn = cmid->context;
                if (conn->ibc_state < IBLND_CONN_ESTABLISHED) {
                        CERROR("%s DISCONNECTED\n",
                               libcfs_nid2str(conn->ibc_peer->ibp_nid));
                        kiblnd_connreq_done(conn, -ECONNRESET);
                } else {
                        kiblnd_close_conn(conn, 0);
                }
                kiblnd_conn_decref(conn);
                cmid->context = NULL;
                return 0;

        case RDMA_CM_EVENT_DEVICE_REMOVAL:
                LCONSOLE_ERROR_MSG(0x131,
                                   "Received notification of device removal\n"
                                   "Please shutdown LNET to allow this to proceed\n");
                /* Can't remove network from underneath LNET for now, so I have
                 * to ignore this */
                return 0;

        case RDMA_CM_EVENT_ADDR_CHANGE:
                LCONSOLE_INFO("Physical link changed (eg hca/port)\n");
                return 0;
        }
}

static int
kiblnd_check_txs_locked(struct kib_conn *conn, struct list_head *txs)
{
	struct kib_tx *tx;
	struct list_head *ttmp;

	list_for_each(ttmp, txs) {
		tx = list_entry(ttmp, struct kib_tx, tx_list);

		if (txs != &conn->ibc_active_txs) {
			LASSERT(tx->tx_queued);
		} else {
			LASSERT(!tx->tx_queued);
			LASSERT(tx->tx_waiting || tx->tx_sending != 0);
		}

		if (ktime_compare(ktime_get(), tx->tx_deadline) >= 0) {
			CERROR("Timed out tx: %s, %lld seconds\n",
			       kiblnd_queue2str(conn, txs),
			       ktime_ms_delta(ktime_get(),
					      tx->tx_deadline) / MSEC_PER_SEC);
			return 1;
		}
	}

	return 0;
}

static int
kiblnd_conn_timed_out_locked(struct kib_conn *conn)
{
        return  kiblnd_check_txs_locked(conn, &conn->ibc_tx_queue) ||
                kiblnd_check_txs_locked(conn, &conn->ibc_tx_noops) ||
                kiblnd_check_txs_locked(conn, &conn->ibc_tx_queue_rsrvd) ||
                kiblnd_check_txs_locked(conn, &conn->ibc_tx_queue_nocred) ||
                kiblnd_check_txs_locked(conn, &conn->ibc_active_txs);
}

static void
kiblnd_check_conns (int idx)
{
	LIST_HEAD(closes);
	LIST_HEAD(checksends);
	LIST_HEAD(timedout_txs);
	struct list_head *peers = &kiblnd_data.kib_peers[idx];
	struct list_head *ptmp;
	struct kib_peer_ni *peer_ni;
	struct kib_conn	*conn;
	struct kib_tx *tx, *tx_tmp;
	struct list_head *ctmp;
	unsigned long	  flags;

	/* NB. We expect to have a look at all the peers and not find any
	 * RDMAs to time out, so we just use a shared lock while we
	 * take a look... */
	write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);

	list_for_each(ptmp, peers) {
		peer_ni = list_entry(ptmp, struct kib_peer_ni, ibp_list);

		/* Check tx_deadline */
		list_for_each_entry_safe(tx, tx_tmp, &peer_ni->ibp_tx_queue, tx_list) {
			if (ktime_compare(ktime_get(), tx->tx_deadline) >= 0) {
				CWARN("Timed out tx for %s: %lld seconds\n",
				      libcfs_nid2str(peer_ni->ibp_nid),
				      ktime_ms_delta(ktime_get(),
						     tx->tx_deadline) / MSEC_PER_SEC);
				list_move(&tx->tx_list, &timedout_txs);
			}
		}

		list_for_each(ctmp, &peer_ni->ibp_conns) {
			int timedout;
			int sendnoop;

			conn = list_entry(ctmp, struct kib_conn, ibc_list);

			LASSERT(conn->ibc_state == IBLND_CONN_ESTABLISHED);

			spin_lock(&conn->ibc_lock);

			sendnoop = kiblnd_need_noop(conn);
			timedout = kiblnd_conn_timed_out_locked(conn);
			if (!sendnoop && !timedout) {
				spin_unlock(&conn->ibc_lock);
				continue;
			}

			if (timedout) {
				CERROR("Timed out RDMA with %s (%lld): "
				       "c: %u, oc: %u, rc: %u\n",
				       libcfs_nid2str(peer_ni->ibp_nid),
				       ktime_get_seconds() - peer_ni->ibp_last_alive,
				       conn->ibc_credits,
				       conn->ibc_outstanding_credits,
				       conn->ibc_reserved_credits);
				list_add(&conn->ibc_connd_list, &closes);
			} else {
				list_add(&conn->ibc_connd_list, &checksends);
			}
			/* +ref for 'closes' or 'checksends' */
			kiblnd_conn_addref(conn);

			spin_unlock(&conn->ibc_lock);
		}
	}

	write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);

	if (!list_empty(&timedout_txs))
		kiblnd_txlist_done(&timedout_txs, -ETIMEDOUT,
				   LNET_MSG_STATUS_LOCAL_TIMEOUT);

	/* Handle timeout by closing the whole
	 * connection. We can only be sure RDMA activity
	 * has ceased once the QP has been modified. */
	while (!list_empty(&closes)) {
		conn = list_entry(closes.next,
				  struct kib_conn, ibc_connd_list);
		list_del(&conn->ibc_connd_list);
		kiblnd_close_conn(conn, -ETIMEDOUT);
		kiblnd_conn_decref(conn);
	}

	/* In case we have enough credits to return via a
	 * NOOP, but there were no non-blocking tx descs
	 * free to do it last time... */
	while (!list_empty(&checksends)) {
		conn = list_entry(checksends.next,
				  struct kib_conn, ibc_connd_list);
		list_del(&conn->ibc_connd_list);

		spin_lock(&conn->ibc_lock);
		kiblnd_check_sends_locked(conn);
		spin_unlock(&conn->ibc_lock);

		kiblnd_conn_decref(conn);
	}
}

static void
kiblnd_disconnect_conn(struct kib_conn *conn)
{
	LASSERT (!in_interrupt());
	LASSERT (current == kiblnd_data.kib_connd);
	LASSERT (conn->ibc_state == IBLND_CONN_CLOSING);

	rdma_disconnect(conn->ibc_cmid);
	kiblnd_finalise_conn(conn);

	kiblnd_peer_notify(conn->ibc_peer);
}

/*
 * High-water for reconnection to the same peer_ni, reconnection attempt should
 * be delayed after trying more than KIB_RECONN_HIGH_RACE.
 */
#define KIB_RECONN_HIGH_RACE	10
/*
 * Allow connd to take a break and handle other things after consecutive
 * reconnection attemps.
 */
#define KIB_RECONN_BREAK	100

int
kiblnd_connd (void *arg)
{
	spinlock_t	  *lock= &kiblnd_data.kib_connd_lock;
	wait_queue_entry_t wait;
	unsigned long      flags;
	struct kib_conn *conn;
	int                timeout;
	int                i;
	int                dropped_lock;
	int                peer_index = 0;
	unsigned long      deadline = jiffies;

	cfs_block_allsigs();

	init_waitqueue_entry(&wait, current);
	kiblnd_data.kib_connd = current;

	spin_lock_irqsave(lock, flags);

	while (!kiblnd_data.kib_shutdown) {
		int reconn = 0;

                dropped_lock = 0;

		if (!list_empty(&kiblnd_data.kib_connd_zombies)) {
			struct kib_peer_ni *peer_ni = NULL;

			conn = list_entry(kiblnd_data.kib_connd_zombies.next,
					  struct kib_conn, ibc_list);
			list_del(&conn->ibc_list);
			if (conn->ibc_reconnect) {
				peer_ni = conn->ibc_peer;
				kiblnd_peer_addref(peer_ni);
			}

			spin_unlock_irqrestore(lock, flags);
			dropped_lock = 1;

			kiblnd_destroy_conn(conn);

			spin_lock_irqsave(lock, flags);
			if (!peer_ni) {
				LIBCFS_FREE(conn, sizeof(*conn));
				continue;
			}

			conn->ibc_peer = peer_ni;
			if (peer_ni->ibp_reconnected < KIB_RECONN_HIGH_RACE)
				list_add_tail(&conn->ibc_list,
					      &kiblnd_data.kib_reconn_list);
			else
				list_add_tail(&conn->ibc_list,
					      &kiblnd_data.kib_reconn_wait);
		}

		if (!list_empty(&kiblnd_data.kib_connd_conns)) {
			conn = list_entry(kiblnd_data.kib_connd_conns.next,
					  struct kib_conn, ibc_list);
			list_del(&conn->ibc_list);

			spin_unlock_irqrestore(lock, flags);
			dropped_lock = 1;

			kiblnd_disconnect_conn(conn);
			kiblnd_conn_decref(conn);

			spin_lock_irqsave(lock, flags);
                }

		while (reconn < KIB_RECONN_BREAK) {
			if (kiblnd_data.kib_reconn_sec !=
			    ktime_get_real_seconds()) {
				kiblnd_data.kib_reconn_sec = ktime_get_real_seconds();
				list_splice_init(&kiblnd_data.kib_reconn_wait,
						 &kiblnd_data.kib_reconn_list);
			}

			if (list_empty(&kiblnd_data.kib_reconn_list))
				break;

			conn = list_entry(kiblnd_data.kib_reconn_list.next,
					  struct kib_conn, ibc_list);
			list_del(&conn->ibc_list);

			spin_unlock_irqrestore(lock, flags);
			dropped_lock = 1;

			reconn += kiblnd_reconnect_peer(conn->ibc_peer);
			kiblnd_peer_decref(conn->ibc_peer);
			LIBCFS_FREE(conn, sizeof(*conn));

			spin_lock_irqsave(lock, flags);
		}

                /* careful with the jiffy wrap... */
                timeout = (int)(deadline - jiffies);
                if (timeout <= 0) {
                        const int n = 4;
                        const int p = 1;
                        int       chunk = kiblnd_data.kib_peer_hash_size;
			unsigned int lnd_timeout;

			spin_unlock_irqrestore(lock, flags);
                        dropped_lock = 1;

                        /* Time to check for RDMA timeouts on a few more
                         * peers: I do checks every 'p' seconds on a
                         * proportion of the peer_ni table and I need to check
                         * every connection 'n' times within a timeout
                         * interval, to ensure I detect a timeout on any
                         * connection within (n+1)/n times the timeout
                         * interval. */

			lnd_timeout = lnet_get_lnd_timeout();
			if (lnd_timeout > n * p)
				chunk = (chunk * n * p) / lnd_timeout;
			if (chunk == 0)
				chunk = 1;

			for (i = 0; i < chunk; i++) {
				kiblnd_check_conns(peer_index);
				peer_index = (peer_index + 1) %
					     kiblnd_data.kib_peer_hash_size;
			}

			deadline += cfs_time_seconds(p);
			spin_lock_irqsave(lock, flags);
		}

		if (dropped_lock)
			continue;

		/* Nothing to do for 'timeout'  */
		set_current_state(TASK_INTERRUPTIBLE);
		add_wait_queue(&kiblnd_data.kib_connd_waitq, &wait);
		spin_unlock_irqrestore(lock, flags);

		schedule_timeout(timeout);

		set_current_state(TASK_RUNNING);
		remove_wait_queue(&kiblnd_data.kib_connd_waitq, &wait);
		spin_lock_irqsave(lock, flags);
	}

	spin_unlock_irqrestore(lock, flags);

	kiblnd_thread_fini();
	return 0;
}

void
kiblnd_qp_event(struct ib_event *event, void *arg)
{
	struct kib_conn *conn = arg;

	switch (event->event) {
	case IB_EVENT_COMM_EST:
		CDEBUG(D_NET, "%s established\n",
		       libcfs_nid2str(conn->ibc_peer->ibp_nid));
		/* We received a packet but connection isn't established
		 * probably handshake packet was lost, so free to
		 * force make connection established */
		rdma_notify(conn->ibc_cmid, IB_EVENT_COMM_EST);
		return;

	case IB_EVENT_PORT_ERR:
	case IB_EVENT_DEVICE_FATAL:
		CERROR("Fatal device error for NI %s\n",
		       libcfs_nid2str(conn->ibc_peer->ibp_ni->ni_nid));
		atomic_set(&conn->ibc_peer->ibp_ni->ni_fatal_error_on, 1);
		return;

	case IB_EVENT_PORT_ACTIVE:
		CERROR("Port reactivated for NI %s\n",
		       libcfs_nid2str(conn->ibc_peer->ibp_ni->ni_nid));
		atomic_set(&conn->ibc_peer->ibp_ni->ni_fatal_error_on, 0);
		return;

	default:
		CERROR("%s: Async QP event type %d\n",
		       libcfs_nid2str(conn->ibc_peer->ibp_nid), event->event);
		return;
	}
}

static void
kiblnd_complete (struct ib_wc *wc)
{
	switch (kiblnd_wreqid2type(wc->wr_id)) {
	default:
		LBUG();

	case IBLND_WID_MR:
		if (wc->status != IB_WC_SUCCESS &&
		    wc->status != IB_WC_WR_FLUSH_ERR)
			CNETERR("FastReg failed: %d\n", wc->status);
		return;

        case IBLND_WID_RDMA:
                /* We only get RDMA completion notification if it fails.  All
                 * subsequent work items, including the final SEND will fail
                 * too.  However we can't print out any more info about the
                 * failing RDMA because 'tx' might be back on the idle list or
                 * even reused already if we didn't manage to post all our work
                 * items */
                CNETERR("RDMA (tx: %p) failed: %d\n",
                        kiblnd_wreqid2ptr(wc->wr_id), wc->status);
                return;

        case IBLND_WID_TX:
                kiblnd_tx_complete(kiblnd_wreqid2ptr(wc->wr_id), wc->status);
                return;

        case IBLND_WID_RX:
                kiblnd_rx_complete(kiblnd_wreqid2ptr(wc->wr_id), wc->status,
                                   wc->byte_len);
                return;
        }
}

void
kiblnd_cq_completion(struct ib_cq *cq, void *arg)
{
	/* NB I'm not allowed to schedule this conn once its refcount has
	 * reached 0.  Since fundamentally I'm racing with scheduler threads
	 * consuming my CQ I could be called after all completions have
	 * occurred.  But in this case, ibc_nrx == 0 && ibc_nsends_posted == 0
	 * and this CQ is about to be destroyed so I NOOP. */
	struct kib_conn	*conn = arg;
	struct kib_sched_info *sched = conn->ibc_sched;
	unsigned long flags;

	LASSERT(cq == conn->ibc_cq);

	spin_lock_irqsave(&sched->ibs_lock, flags);

	conn->ibc_ready = 1;

	if (!conn->ibc_scheduled &&
	    (conn->ibc_nrx > 0 ||
	     conn->ibc_nsends_posted > 0)) {
		kiblnd_conn_addref(conn); /* +1 ref for sched_conns */
		conn->ibc_scheduled = 1;
		list_add_tail(&conn->ibc_sched_list, &sched->ibs_conns);

		if (waitqueue_active(&sched->ibs_waitq))
			wake_up(&sched->ibs_waitq);
	}

	spin_unlock_irqrestore(&sched->ibs_lock, flags);
}

void
kiblnd_cq_event(struct ib_event *event, void *arg)
{
	struct kib_conn *conn = arg;

        CERROR("%s: async CQ event type %d\n",
               libcfs_nid2str(conn->ibc_peer->ibp_nid), event->event);
}

int
kiblnd_scheduler(void *arg)
{
	long			id = (long)arg;
	struct kib_sched_info	*sched;
	struct kib_conn	*conn;
	wait_queue_entry_t      wait;
	unsigned long		flags;
	struct ib_wc		wc;
	int			did_something;
	int			busy_loops = 0;
	int			rc;

	cfs_block_allsigs();

	init_waitqueue_entry(&wait, current);

	sched = kiblnd_data.kib_scheds[KIB_THREAD_CPT(id)];

	rc = cfs_cpt_bind(lnet_cpt_table(), sched->ibs_cpt);
	if (rc != 0) {
		CWARN("Unable to bind on CPU partition %d, please verify "
		      "whether all CPUs are healthy and reload modules if "
		      "necessary, otherwise your system might under risk of "
		      "low performance\n", sched->ibs_cpt);
	}

	spin_lock_irqsave(&sched->ibs_lock, flags);

	while (!kiblnd_data.kib_shutdown) {
		if (busy_loops++ >= IBLND_RESCHED) {
			spin_unlock_irqrestore(&sched->ibs_lock, flags);

			cond_resched();
			busy_loops = 0;

			spin_lock_irqsave(&sched->ibs_lock, flags);
		}

		did_something = 0;

		if (!list_empty(&sched->ibs_conns)) {
			conn = list_entry(sched->ibs_conns.next,
					  struct kib_conn, ibc_sched_list);
			/* take over kib_sched_conns' ref on conn... */
			LASSERT(conn->ibc_scheduled);
			list_del(&conn->ibc_sched_list);
			conn->ibc_ready = 0;

			spin_unlock_irqrestore(&sched->ibs_lock, flags);

			wc.wr_id = IBLND_WID_INVAL;

                        rc = ib_poll_cq(conn->ibc_cq, 1, &wc);
                        if (rc == 0) {
                                rc = ib_req_notify_cq(conn->ibc_cq,
                                                      IB_CQ_NEXT_COMP);
                                if (rc < 0) {
                                        CWARN("%s: ib_req_notify_cq failed: %d, "
                                              "closing connection\n",
                                              libcfs_nid2str(conn->ibc_peer->ibp_nid), rc);
                                        kiblnd_close_conn(conn, -EIO);
                                        kiblnd_conn_decref(conn);
					spin_lock_irqsave(&sched->ibs_lock,
							      flags);
					continue;
				}

				rc = ib_poll_cq(conn->ibc_cq, 1, &wc);
			}

			if (unlikely(rc > 0 && wc.wr_id == IBLND_WID_INVAL)) {
				LCONSOLE_ERROR(
					"ib_poll_cq (rc: %d) returned invalid "
					"wr_id, opcode %d, status: %d, "
					"vendor_err: %d, conn: %s status: %d\n"
					"please upgrade firmware and OFED or "
					"contact vendor.\n", rc,
					wc.opcode, wc.status, wc.vendor_err,
					libcfs_nid2str(conn->ibc_peer->ibp_nid),
					conn->ibc_state);
				rc = -EINVAL;
			}

			if (rc < 0) {
				CWARN("%s: ib_poll_cq failed: %d, "
				      "closing connection\n",
				      libcfs_nid2str(conn->ibc_peer->ibp_nid),
				      rc);
				kiblnd_close_conn(conn, -EIO);
				kiblnd_conn_decref(conn);
				spin_lock_irqsave(&sched->ibs_lock, flags);
				continue;
			}

			spin_lock_irqsave(&sched->ibs_lock, flags);

			if (rc != 0 || conn->ibc_ready) {
				/* There may be another completion waiting; get
				 * another scheduler to check while I handle
				 * this one... */
				/* +1 ref for sched_conns */
				kiblnd_conn_addref(conn);
				list_add_tail(&conn->ibc_sched_list,
						  &sched->ibs_conns);
				if (waitqueue_active(&sched->ibs_waitq))
					wake_up(&sched->ibs_waitq);
			} else {
				conn->ibc_scheduled = 0;
			}

			if (rc != 0) {
				spin_unlock_irqrestore(&sched->ibs_lock, flags);
				kiblnd_complete(&wc);

				spin_lock_irqsave(&sched->ibs_lock, flags);
                        }

                        kiblnd_conn_decref(conn); /* ...drop my ref from above */
                        did_something = 1;
                }

                if (did_something)
                        continue;

		set_current_state(TASK_INTERRUPTIBLE);
		add_wait_queue_exclusive(&sched->ibs_waitq, &wait);
		spin_unlock_irqrestore(&sched->ibs_lock, flags);

		schedule();
		busy_loops = 0;

		remove_wait_queue(&sched->ibs_waitq, &wait);
		set_current_state(TASK_RUNNING);
		spin_lock_irqsave(&sched->ibs_lock, flags);
	}

	spin_unlock_irqrestore(&sched->ibs_lock, flags);

	kiblnd_thread_fini();
	return 0;
}

int
kiblnd_failover_thread(void *arg)
{
	rwlock_t	*glock = &kiblnd_data.kib_global_lock;
	struct kib_dev *dev;
	struct net *ns = arg;
	wait_queue_entry_t wait;
	unsigned long	 flags;
	int		 rc;

	LASSERT(*kiblnd_tunables.kib_dev_failover != 0);

	cfs_block_allsigs();

	init_waitqueue_entry(&wait, current);
	write_lock_irqsave(glock, flags);

        while (!kiblnd_data.kib_shutdown) {
                int     do_failover = 0;
                int     long_sleep;

		list_for_each_entry(dev, &kiblnd_data.kib_failed_devs,
                                    ibd_fail_list) {
			if (ktime_get_seconds() < dev->ibd_next_failover)
                                continue;
                        do_failover = 1;
                        break;
                }

                if (do_failover) {
			list_del_init(&dev->ibd_fail_list);
                        dev->ibd_failover = 1;
			write_unlock_irqrestore(glock, flags);

			rc = kiblnd_dev_failover(dev, ns);

			write_lock_irqsave(glock, flags);

                        LASSERT (dev->ibd_failover);
                        dev->ibd_failover = 0;
                        if (rc >= 0) { /* Device is OK or failover succeed */
				dev->ibd_next_failover = ktime_get_seconds() + 3;
                                continue;
                        }

                        /* failed to failover, retry later */
			dev->ibd_next_failover = ktime_get_seconds() +
						 min(dev->ibd_failed_failover, 10);
                        if (kiblnd_dev_can_failover(dev)) {
				list_add_tail(&dev->ibd_fail_list,
                                              &kiblnd_data.kib_failed_devs);
                        }

                        continue;
                }

                /* long sleep if no more pending failover */
		long_sleep = list_empty(&kiblnd_data.kib_failed_devs);

		set_current_state(TASK_INTERRUPTIBLE);
		add_wait_queue(&kiblnd_data.kib_failover_waitq, &wait);
		write_unlock_irqrestore(glock, flags);

		rc = schedule_timeout(long_sleep ? cfs_time_seconds(10) :
						   cfs_time_seconds(1));
		set_current_state(TASK_RUNNING);
		remove_wait_queue(&kiblnd_data.kib_failover_waitq, &wait);
		write_lock_irqsave(glock, flags);

                if (!long_sleep || rc != 0)
                        continue;

                /* have a long sleep, routine check all active devices,
                 * we need checking like this because if there is not active
                 * connection on the dev and no SEND from local, we may listen
                 * on wrong HCA for ever while there is a bonding failover */
		list_for_each_entry(dev, &kiblnd_data.kib_devs, ibd_list) {
                        if (kiblnd_dev_can_failover(dev)) {
				list_add_tail(&dev->ibd_fail_list,
                                              &kiblnd_data.kib_failed_devs);
                        }
                }
        }

	write_unlock_irqrestore(glock, flags);

        kiblnd_thread_fini();
        return 0;
}