add a machinereadable version of ctdb stats/statistics
[metze/ctdb/wip.git] / ib / ibwrapper.c
index 5d2d35449b67d9bf313a49f8f7271983200d7ce9..f6e71687f324856d16868e61ce8e9f458d512822 100644 (file)
@@ -8,7 +8,7 @@
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
+ * the Free Software Foundation; either version 3 of the License, or
  * (at your option) any later version.
  *
  * This program is distributed in the hope that it will be useful,
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ * along with this program; if not, see <http://www.gnu.org/licenses/>.
  */
 
-#include "ibwrapper.h"
-
 #include <stdlib.h>
 #include <string.h>
 #include <stdio.h>
 #include <sys/socket.h>
 #include <netdb.h>
 #include <arpa/inet.h>
+#include <malloc.h>
+#include <assert.h>
+#include <unistd.h>
 
-#include <rdma/rdma_cma.h>
+#include "includes.h"
 #include "lib/events/events.h"
+#include "ibwrapper.h"
 
-#include "ibwrapper_internal.h"
+#include <infiniband/kern-abi.h>
+#include <rdma/rdma_cma_abi.h>
+#include <rdma/rdma_cma.h>
 
+#include "ibwrapper_internal.h"
+#include "lib/util/dlinklist.h"
 
 #define IBW_LASTERR_BUFSIZE 512
 static char ibw_lasterr[IBW_LASTERR_BUFSIZE];
 
-static ibw_mr *ibw_alloc_mr(ibw_ctx_priv *pctx)
+#define IBW_MAX_SEND_WR 256
+#define IBW_MAX_RECV_WR 1024
+#define IBW_RECV_BUFSIZE 256
+#define IBW_RECV_THRESHOLD (1 * 1024 * 1024)
+
+static void ibw_event_handler_verbs(struct event_context *ev,
+       struct fd_event *fde, uint16_t flags, void *private_data);
+static int ibw_fill_cq(struct ibw_conn *conn);
+static int ibw_wc_recv(struct ibw_conn *conn, struct ibv_wc *wc);
+static int ibw_wc_send(struct ibw_conn *conn, struct ibv_wc *wc);
+static int ibw_send_packet(struct ibw_conn *conn, void *buf, struct ibw_wr *p, uint32_t len);
+
+static void *ibw_alloc_mr(struct ibw_ctx_priv *pctx, struct ibw_conn_priv *pconn,
+       uint32_t n, struct ibv_mr **ppmr)
 {
+       void *buf;
+
+       DEBUG(DEBUG_DEBUG, ("ibw_alloc_mr(cmid=%p, n=%u)\n", pconn->cm_id, n));
+       buf = memalign(pctx->pagesize, n);
+       if (!buf) {
+               sprintf(ibw_lasterr, "couldn't allocate memory\n");
+               return NULL;
+       }
+
+       *ppmr = ibv_reg_mr(pconn->pd, buf, n, IBV_ACCESS_LOCAL_WRITE);
+       if (!*ppmr) {
+               sprintf(ibw_lasterr, "couldn't allocate mr\n");
+               free(buf);
+               return NULL;
+       }
+
+       return buf;
 }
 
-static int ibwctx_destruct(void *ptr)
+static void ibw_free_mr(char **ppbuf, struct ibv_mr **ppmr)
 {
-       ibw_ctx *pctx = talloc_get_type(ptr, ibw_ctx);
-       assert(pctx!=NULL);
+       DEBUG(DEBUG_DEBUG, ("ibw_free_mr(%p %p)\n", *ppbuf, *ppmr));
+       if (*ppmr!=NULL) {
+               ibv_dereg_mr(*ppmr);
+               *ppmr = NULL;
+       }
+       if (*ppbuf) {
+               free(*ppbuf);
+               *ppbuf = NULL;
+       }
+}
+
+static int ibw_init_memory(struct ibw_conn *conn)
+{
+       struct ibw_ctx_priv *pctx = talloc_get_type(conn->ctx->internal, struct ibw_ctx_priv);
+       struct ibw_conn_priv *pconn = talloc_get_type(conn->internal, struct ibw_conn_priv);
+       struct ibw_opts *opts = &pctx->opts;
+       int     i;
+       struct ibw_wr   *p;
+
+       DEBUG(DEBUG_DEBUG, ("ibw_init_memory(cmid: %p)\n", pconn->cm_id));
+       pconn->buf_send = ibw_alloc_mr(pctx, pconn,
+               opts->max_send_wr * opts->recv_bufsize, &pconn->mr_send);
+       if (!pconn->buf_send) {
+               sprintf(ibw_lasterr, "couldn't allocate work send buf\n");
+               return -1;
+       }
+
+       pconn->buf_recv = ibw_alloc_mr(pctx, pconn,
+               opts->max_recv_wr * opts->recv_bufsize, &pconn->mr_recv);
+       if (!pconn->buf_recv) {
+               sprintf(ibw_lasterr, "couldn't allocate work recv buf\n");
+               return -1;
+       }
+
+       pconn->wr_index = talloc_size(pconn, opts->max_send_wr * sizeof(struct ibw_wr *));
+       assert(pconn->wr_index!=NULL);
+
+       for(i=0; i<opts->max_send_wr; i++) {
+               p = pconn->wr_index[i] = talloc_zero(pconn, struct ibw_wr);
+               p->buf = pconn->buf_send + (i * opts->recv_bufsize);
+               p->wr_id = i;
+
+               DLIST_ADD(pconn->wr_list_avail, p);
+       }
+
+       return 0;
+}
+
+static int ibw_ctx_priv_destruct(struct ibw_ctx_priv *pctx)
+{
+       DEBUG(DEBUG_DEBUG, ("ibw_ctx_priv_destruct(%p)\n", pctx));
+
+       /* destroy cm */
+       if (pctx->cm_channel) {
+               rdma_destroy_event_channel(pctx->cm_channel);
+               pctx->cm_channel = NULL;
+       }
+       if (pctx->cm_channel_event) {
+               /* TODO: do we have to do this here? */
+               talloc_free(pctx->cm_channel_event);
+               pctx->cm_channel_event = NULL;
+       }
+       if (pctx->cm_id) {
+               rdma_destroy_id(pctx->cm_id);
+               pctx->cm_id = NULL;
+       }
+
+       return 0;
+}
+
+static int ibw_ctx_destruct(struct ibw_ctx *ctx)
+{
+       DEBUG(DEBUG_DEBUG, ("ibw_ctx_destruct(%p)\n", ctx));
+       return 0;
+}
+
+static int ibw_conn_priv_destruct(struct ibw_conn_priv *pconn)
+{
+       DEBUG(DEBUG_DEBUG, ("ibw_conn_priv_destruct(%p, cmid: %p)\n",
+               pconn, pconn->cm_id));
+
+       /* pconn->wr_index is freed by talloc */
+       /* pconn->wr_index[i] are freed by talloc */
+
+       /* destroy verbs */
+       if (pconn->cm_id!=NULL && pconn->cm_id->qp!=NULL) {
+               rdma_destroy_qp(pconn->cm_id);
+               pconn->cm_id->qp = NULL;
+       }
+
+       if (pconn->cq!=NULL) {
+               ibv_destroy_cq(pconn->cq);
+               pconn->cq = NULL;
+       }
+
+       if (pconn->verbs_channel!=NULL) {
+               ibv_destroy_comp_channel(pconn->verbs_channel);
+               pconn->verbs_channel = NULL;
+       }
+
+       /* must be freed here because its order is important */
+       if (pconn->verbs_channel_event) {
+               talloc_free(pconn->verbs_channel_event);
+               pconn->verbs_channel_event = NULL;
+       }
 
        /* free memory regions */
+       ibw_free_mr(&pconn->buf_send, &pconn->mr_send);
+       ibw_free_mr(&pconn->buf_recv, &pconn->mr_recv);
+
+       if (pconn->pd) {
+               ibv_dealloc_pd(pconn->pd);
+               pconn->pd = NULL;
+               DEBUG(DEBUG_DEBUG, ("pconn=%p pd deallocated\n", pconn));
+       }
+
+       if (pconn->cm_id) {
+               rdma_destroy_id(pconn->cm_id);
+               pconn->cm_id = NULL;
+               DEBUG(DEBUG_DEBUG, ("pconn=%p cm_id destroyed\n", pconn));
+       }
 
        return 0;
 }
 
-int ibw_process_event(ibw_ctx *ctx, int fd_index);
+static int ibw_wr_destruct(struct ibw_wr *wr)
+{
+       if (wr->buf_large!=NULL)
+               ibw_free_mr(&wr->buf_large, &wr->mr_large);
+       return 0;
+}
+
+static int ibw_conn_destruct(struct ibw_conn *conn)
+{
+       DEBUG(DEBUG_DEBUG, ("ibw_conn_destruct(%p)\n", conn));
+       
+       /* important here: ctx is a talloc _parent_ */
+       DLIST_REMOVE(conn->ctx->conn_list, conn);
+       return 0;
+}
 
-static void ibw_process_cm_event(struct event_context *ev,
+struct ibw_conn *ibw_conn_new(struct ibw_ctx *ctx, TALLOC_CTX *mem_ctx)
+{
+       struct ibw_conn *conn;
+       struct ibw_conn_priv *pconn;
+
+       assert(ctx!=NULL);
+
+       conn = talloc_zero(mem_ctx, struct ibw_conn);
+       assert(conn!=NULL);
+       talloc_set_destructor(conn, ibw_conn_destruct);
+
+       pconn = talloc_zero(conn, struct ibw_conn_priv);
+       assert(pconn!=NULL);
+       talloc_set_destructor(pconn, ibw_conn_priv_destruct);
+
+       conn->ctx = ctx;
+       conn->internal = (void *)pconn;
+
+       DLIST_ADD(ctx->conn_list, conn);
+
+       return conn;
+}
+
+static int ibw_setup_cq_qp(struct ibw_conn *conn)
+{
+       struct ibw_ctx_priv *pctx = talloc_get_type(conn->ctx->internal, struct ibw_ctx_priv);
+       struct ibw_conn_priv *pconn = talloc_get_type(conn->internal, struct ibw_conn_priv);
+       struct ibv_qp_init_attr init_attr;
+       struct ibv_qp_attr attr;
+       int rc;
+
+       DEBUG(DEBUG_DEBUG, ("ibw_setup_cq_qp(cmid: %p)\n", pconn->cm_id));
+
+       /* init verbs */
+       pconn->verbs_channel = ibv_create_comp_channel(pconn->cm_id->verbs);
+       if (!pconn->verbs_channel) {
+               sprintf(ibw_lasterr, "ibv_create_comp_channel failed %d\n", errno);
+               return -1;
+       }
+       DEBUG(DEBUG_DEBUG, ("created channel %p\n", pconn->verbs_channel));
+
+       pconn->verbs_channel_event = event_add_fd(pctx->ectx, NULL, /* not pconn or conn */
+               pconn->verbs_channel->fd, EVENT_FD_READ, ibw_event_handler_verbs, conn);
+
+       pconn->pd = ibv_alloc_pd(pconn->cm_id->verbs);
+       if (!pconn->pd) {
+               sprintf(ibw_lasterr, "ibv_alloc_pd failed %d\n", errno);
+               return -1;
+       }
+       DEBUG(DEBUG_DEBUG, ("created pd %p\n", pconn->pd));
+
+       /* init mr */
+       if (ibw_init_memory(conn))
+               return -1;
+
+       /* init cq */
+       pconn->cq = ibv_create_cq(pconn->cm_id->verbs,
+               pctx->opts.max_recv_wr + pctx->opts.max_send_wr,
+               conn, pconn->verbs_channel, 0);
+       if (pconn->cq==NULL) {
+               sprintf(ibw_lasterr, "ibv_create_cq failed\n");
+               return -1;
+       }
+
+       rc = ibv_req_notify_cq(pconn->cq, 0);
+       if (rc) {
+               sprintf(ibw_lasterr, "ibv_req_notify_cq failed with %d\n", rc);
+               return rc;
+       }
+
+       /* init qp */
+       memset(&init_attr, 0, sizeof(init_attr));
+       init_attr.cap.max_send_wr = pctx->opts.max_send_wr;
+       init_attr.cap.max_recv_wr = pctx->opts.max_recv_wr;
+       init_attr.cap.max_recv_sge = 1;
+       init_attr.cap.max_send_sge = 1;
+       init_attr.qp_type = IBV_QPT_RC;
+       init_attr.send_cq = pconn->cq;
+       init_attr.recv_cq = pconn->cq;
+
+       rc = rdma_create_qp(pconn->cm_id, pconn->pd, &init_attr);
+       if (rc) {
+               sprintf(ibw_lasterr, "rdma_create_qp failed with %d\n", rc);
+               return rc;
+       }
+       /* elase result is in pconn->cm_id->qp */
+
+       rc = ibv_query_qp(pconn->cm_id->qp, &attr, IBV_QP_PATH_MTU, &init_attr);
+       if (rc) {
+               sprintf(ibw_lasterr, "ibv_query_qp failed with %d\n", rc);
+               return rc;
+       }
+
+       return ibw_fill_cq(conn);
+}
+
+static int ibw_refill_cq_recv(struct ibw_conn *conn)
+{
+       struct ibw_ctx_priv *pctx = talloc_get_type(conn->ctx->internal, struct ibw_ctx_priv);
+       struct ibw_conn_priv *pconn = talloc_get_type(conn->internal, struct ibw_conn_priv);
+       int     rc;
+       struct ibv_sge list = {
+               .addr   = (uintptr_t) NULL, /* filled below */
+               .length = pctx->opts.recv_bufsize,
+               .lkey   = pconn->mr_recv->lkey /* always the same */
+       };
+       struct ibv_recv_wr wr = {
+               .wr_id      = 0, /* filled below */
+               .sg_list    = &list,
+               .num_sge    = 1,
+       };
+       struct ibv_recv_wr *bad_wr;
+
+       DEBUG(DEBUG_DEBUG, ("ibw_refill_cq_recv(cmid: %p)\n", pconn->cm_id));
+
+       list.addr = (uintptr_t) pconn->buf_recv + pctx->opts.recv_bufsize * pconn->recv_index;
+       wr.wr_id = pconn->recv_index;
+       pconn->recv_index = (pconn->recv_index + 1) % pctx->opts.max_recv_wr;
+
+       rc = ibv_post_recv(pconn->cm_id->qp, &wr, &bad_wr);
+       if (rc) {
+               sprintf(ibw_lasterr, "refill/ibv_post_recv failed with %d\n", rc);
+               DEBUG(DEBUG_ERR, (ibw_lasterr));
+               return -2;
+       }
+
+       return 0;
+}
+
+static int ibw_fill_cq(struct ibw_conn *conn)
+{
+       struct ibw_ctx_priv *pctx = talloc_get_type(conn->ctx->internal, struct ibw_ctx_priv);
+       struct ibw_conn_priv *pconn = talloc_get_type(conn->internal, struct ibw_conn_priv);
+       int     i, rc;
+       struct ibv_sge list = {
+               .addr   = (uintptr_t) NULL, /* filled below */
+               .length = pctx->opts.recv_bufsize,
+               .lkey   = pconn->mr_recv->lkey /* always the same */
+       };
+       struct ibv_recv_wr wr = {
+               .wr_id      = 0, /* filled below */
+               .sg_list    = &list,
+               .num_sge    = 1,
+       };
+       struct ibv_recv_wr *bad_wr;
+
+       DEBUG(DEBUG_DEBUG, ("ibw_fill_cq(cmid: %p)\n", pconn->cm_id));
+
+       for(i = pctx->opts.max_recv_wr; i!=0; i--) {
+               list.addr = (uintptr_t) pconn->buf_recv + pctx->opts.recv_bufsize * pconn->recv_index;
+               wr.wr_id = pconn->recv_index;
+               pconn->recv_index = (pconn->recv_index + 1) % pctx->opts.max_recv_wr;
+
+               rc = ibv_post_recv(pconn->cm_id->qp, &wr, &bad_wr);
+               if (rc) {
+                       sprintf(ibw_lasterr, "fill/ibv_post_recv failed with %d\n", rc);
+                       DEBUG(DEBUG_ERR, (ibw_lasterr));
+                       return -2;
+               }
+       }
+
+       return 0;
+}
+
+static int ibw_manage_connect(struct ibw_conn *conn)
+{
+       struct rdma_conn_param conn_param;
+       struct ibw_conn_priv *pconn = talloc_get_type(conn->internal, struct ibw_conn_priv);
+       int     rc;
+
+       DEBUG(DEBUG_DEBUG, ("ibw_manage_connect(cmid: %p)\n", pconn->cm_id));
+
+       if (ibw_setup_cq_qp(conn))
+               return -1;
+
+       /* cm connect */
+       memset(&conn_param, 0, sizeof conn_param);
+       conn_param.responder_resources = 1;
+       conn_param.initiator_depth = 1;
+       conn_param.retry_count = 10;
+
+       rc = rdma_connect(pconn->cm_id, &conn_param);
+       if (rc)
+               sprintf(ibw_lasterr, "rdma_connect error %d\n", rc);
+
+       return rc;
+}
+
+static void ibw_event_handler_cm(struct event_context *ev,
        struct fd_event *fde, uint16_t flags, void *private_data)
 {
-       if (fde->
+       int     rc;
+       struct ibw_ctx  *ctx = talloc_get_type(private_data, struct ibw_ctx);
+       struct ibw_ctx_priv *pctx = talloc_get_type(ctx->internal, struct ibw_ctx_priv);
+       struct ibw_conn *conn = NULL;
+       struct ibw_conn_priv *pconn = NULL;
+       struct rdma_cm_id *cma_id = NULL;
+       struct rdma_cm_event *event = NULL;
+
+       assert(ctx!=NULL);
+
+       rc = rdma_get_cm_event(pctx->cm_channel, &event);
+       if (rc) {
+               ctx->state = IBWS_ERROR;
+               event = NULL;
+               sprintf(ibw_lasterr, "rdma_get_cm_event error %d\n", rc);
+               goto error;
+       }
+       cma_id = event->id;
+
+       DEBUG(DEBUG_DEBUG, ("cma_event type %d cma_id %p (%s)\n", event->event, cma_id,
+                 (cma_id == pctx->cm_id) ? "parent" : "child"));
+
+       switch (event->event) {
+       case RDMA_CM_EVENT_ADDR_RESOLVED:
+               DEBUG(DEBUG_DEBUG, ("RDMA_CM_EVENT_ADDR_RESOLVED\n"));
+               /* continuing from ibw_connect ... */
+               rc = rdma_resolve_route(cma_id, 2000);
+               if (rc) {
+                       sprintf(ibw_lasterr, "rdma_resolve_route error %d\n", rc);
+                       goto error;
+               }
+               /* continued at RDMA_CM_EVENT_ROUTE_RESOLVED */
+               break;
+
+       case RDMA_CM_EVENT_ROUTE_RESOLVED:
+               DEBUG(DEBUG_DEBUG, ("RDMA_CM_EVENT_ROUTE_RESOLVED\n"));
+               /* after RDMA_CM_EVENT_ADDR_RESOLVED: */
+               assert(cma_id->context!=NULL);
+               conn = talloc_get_type(cma_id->context, struct ibw_conn);
+
+               rc = ibw_manage_connect(conn);
+               if (rc)
+                       goto error;
+
+               break;
+
+       case RDMA_CM_EVENT_CONNECT_REQUEST:
+               DEBUG(DEBUG_DEBUG, ("RDMA_CM_EVENT_CONNECT_REQUEST\n"));
+               ctx->state = IBWS_CONNECT_REQUEST;
+               conn = ibw_conn_new(ctx, ctx);
+               pconn = talloc_get_type(conn->internal, struct ibw_conn_priv);
+               pconn->cm_id = cma_id; /* !!! event will be freed but id not */
+               cma_id->context = (void *)conn;
+               DEBUG(DEBUG_DEBUG, ("pconn->cm_id %p\n", pconn->cm_id));
+
+               if (ibw_setup_cq_qp(conn))
+                       goto error;
+
+               conn->state = IBWC_INIT;
+               pctx->connstate_func(ctx, conn);
+
+               /* continued at ibw_accept when invoked by the func above */
+               if (!pconn->is_accepted) {
+                       rc = rdma_reject(cma_id, NULL, 0);
+                       if (rc)
+                               DEBUG(DEBUG_ERR, ("rdma_reject failed with rc=%d\n", rc));
+                       talloc_free(conn);
+                       DEBUG(DEBUG_DEBUG, ("pconn->cm_id %p wasn't accepted\n", pconn->cm_id));
+               }
+
+               /* TODO: clarify whether if it's needed by upper layer: */
+               ctx->state = IBWS_READY;
+               pctx->connstate_func(ctx, NULL);
+
+               /* NOTE: more requests can arrive until RDMA_CM_EVENT_ESTABLISHED ! */
+               break;
+
+       case RDMA_CM_EVENT_ESTABLISHED:
+               /* expected after ibw_accept and ibw_connect[not directly] */
+               DEBUG(DEBUG_INFO, ("ESTABLISHED (conn: %p)\n", cma_id->context));
+               conn = talloc_get_type(cma_id->context, struct ibw_conn);
+               assert(conn!=NULL); /* important assumption */
+
+               DEBUG(DEBUG_DEBUG, ("ibw_setup_cq_qp succeeded (cmid=%p)\n", cma_id));
+
+               /* client conn is up */
+               conn->state = IBWC_CONNECTED;
+
+               /* both ctx and conn have changed */
+               pctx->connstate_func(ctx, conn);
+               break;
+
+       case RDMA_CM_EVENT_ADDR_ERROR:
+               sprintf(ibw_lasterr, "RDMA_CM_EVENT_ADDR_ERROR, error %d\n", event->status);
+       case RDMA_CM_EVENT_ROUTE_ERROR:
+               sprintf(ibw_lasterr, "RDMA_CM_EVENT_ROUTE_ERROR, error %d\n", event->status);
+       case RDMA_CM_EVENT_CONNECT_ERROR:
+               sprintf(ibw_lasterr, "RDMA_CM_EVENT_CONNECT_ERROR, error %d\n", event->status);
+       case RDMA_CM_EVENT_UNREACHABLE:
+               sprintf(ibw_lasterr, "RDMA_CM_EVENT_UNREACHABLE, error %d\n", event->status);
+               goto error;
+       case RDMA_CM_EVENT_REJECTED:
+               sprintf(ibw_lasterr, "RDMA_CM_EVENT_REJECTED, error %d\n", event->status);
+               DEBUG(DEBUG_INFO, ("cm event handler: %s", ibw_lasterr));
+               conn = talloc_get_type(cma_id->context, struct ibw_conn);
+               if (conn) {
+                       /* must be done BEFORE connstate */
+                       if ((rc=rdma_ack_cm_event(event)))
+                               DEBUG(DEBUG_ERR, ("reject/rdma_ack_cm_event failed with %d\n", rc));
+                       event = NULL; /* not to touch cma_id or conn */
+                       conn->state = IBWC_ERROR;
+                       /* it should free the conn */
+                       pctx->connstate_func(NULL, conn);
+               }
+               break; /* this is not strictly an error */
+
+       case RDMA_CM_EVENT_DISCONNECTED:
+               DEBUG(DEBUG_DEBUG, ("RDMA_CM_EVENT_DISCONNECTED\n"));
+               if ((rc=rdma_ack_cm_event(event)))
+                       DEBUG(DEBUG_ERR, ("disc/rdma_ack_cm_event failed with %d\n", rc));
+               event = NULL; /* don't ack more */
+
+               if (cma_id!=pctx->cm_id) {
+                       DEBUG(DEBUG_ERR, ("client DISCONNECT event cm_id=%p\n", cma_id));
+                       conn = talloc_get_type(cma_id->context, struct ibw_conn);
+                       conn->state = IBWC_DISCONNECTED;
+                       pctx->connstate_func(NULL, conn);
+               }
+               break;
+
+       case RDMA_CM_EVENT_DEVICE_REMOVAL:
+               sprintf(ibw_lasterr, "cma detected device removal!\n");
+               goto error;
+
+       default:
+               sprintf(ibw_lasterr, "unknown event %d\n", event->event);
+               goto error;
+       }
+
+       if (event!=NULL && (rc=rdma_ack_cm_event(event))) {
+               sprintf(ibw_lasterr, "rdma_ack_cm_event failed with %d\n", rc);
+               goto error;
+       }
+
+       return;
+error:
+       DEBUG(DEBUG_ERR, ("cm event handler: %s", ibw_lasterr));
+
+       if (event!=NULL) {
+               if (cma_id!=NULL && cma_id!=pctx->cm_id) {
+                       conn = talloc_get_type(cma_id->context, struct ibw_conn);
+                       if (conn) {
+                               conn->state = IBWC_ERROR;
+                               pctx->connstate_func(NULL, conn);
+                       }
+               } else {
+                       ctx->state = IBWS_ERROR;
+                       pctx->connstate_func(ctx, NULL);
+               }
+
+               if ((rc=rdma_ack_cm_event(event))!=0) {
+                       DEBUG(DEBUG_ERR, ("rdma_ack_cm_event failed with %d\n", rc));
+               }
+       }
+
+       return;
 }
 
-static int ibw_process_init_attrs(ibw_initattr *attr, int nattr, ibw_opts *opts)
+static void ibw_event_handler_verbs(struct event_context *ev,
+       struct fd_event *fde, uint16_t flags, void *private_data)
 {
-       int     i;
-       char *name, *value;
+       struct ibw_conn *conn = talloc_get_type(private_data, struct ibw_conn);
+       struct ibw_conn_priv *pconn = talloc_get_type(conn->internal, struct ibw_conn_priv);
+       struct ibw_ctx_priv *pctx = talloc_get_type(conn->ctx->internal, struct ibw_ctx_priv);
+
+       struct ibv_wc wc;
+       int rc;
+       struct ibv_cq *ev_cq;
+       void          *ev_ctx;
+
+       DEBUG(DEBUG_DEBUG, ("ibw_event_handler_verbs(%u)\n", (uint32_t)flags));
+
+       /* TODO: check whether if it's good to have more channels here... */
+       rc = ibv_get_cq_event(pconn->verbs_channel, &ev_cq, &ev_ctx);
+       if (rc) {
+               sprintf(ibw_lasterr, "Failed to get cq_event with %d\n", rc);
+               goto error;
+       }
+       if (ev_cq != pconn->cq) {
+               sprintf(ibw_lasterr, "ev_cq(%p) != pconn->cq(%p)\n", ev_cq, pconn->cq);
+               goto error;
+       }
+       rc = ibv_req_notify_cq(pconn->cq, 0);
+       if (rc) {
+               sprintf(ibw_lasterr, "Couldn't request CQ notification (%d)\n", rc);
+               goto error;
+       }
+
+       while((rc=ibv_poll_cq(pconn->cq, 1, &wc))==1) {
+               if (wc.status) {
+                       sprintf(ibw_lasterr, "cq completion failed status=%d, opcode=%d, rc=%d\n",
+                               wc.status, wc.opcode, rc);
+                       goto error;
+               }
+
+               switch(wc.opcode) {
+               case IBV_WC_SEND:
+                       DEBUG(DEBUG_DEBUG, ("send completion\n"));
+                       if (ibw_wc_send(conn, &wc))
+                               goto error;
+                       break;
+
+               case IBV_WC_RDMA_WRITE:
+                       DEBUG(DEBUG_DEBUG, ("rdma write completion\n"));
+                       break;
        
+               case IBV_WC_RDMA_READ:
+                       DEBUG(DEBUG_DEBUG, ("rdma read completion\n"));
+                       break;
+
+               case IBV_WC_RECV:
+                       DEBUG(DEBUG_DEBUG, ("recv completion\n"));
+                       if (ibw_wc_recv(conn, &wc))
+                               goto error;
+                       break;
+
+               default:
+                       sprintf(ibw_lasterr, "unknown completion %d\n", wc.opcode);
+                       goto error;
+               }
+       }
+       if (rc!=0) {
+               sprintf(ibw_lasterr, "ibv_poll_cq error %d\n", rc);
+               goto error;
+       }
+
+       ibv_ack_cq_events(pconn->cq, 1);
+
+       return;
+error:
+       ibv_ack_cq_events(pconn->cq, 1);
+
+       DEBUG(DEBUG_ERR, (ibw_lasterr));
+       
+       if (conn->state!=IBWC_ERROR) {
+               conn->state = IBWC_ERROR;
+               pctx->connstate_func(NULL, conn);
+       }
+}
+
+static int ibw_process_queue(struct ibw_conn *conn)
+{
+       struct ibw_conn_priv *pconn = talloc_get_type(conn->internal, struct ibw_conn_priv);
+       struct ibw_ctx_priv *pctx;
+       struct ibw_wr   *p;
+       int     rc;
+       uint32_t        msg_size;
+
+       if (pconn->queue==NULL)
+               return 0; /* NOP */
+
+       p = pconn->queue;
+
+       /* we must have at least 1 fragment to send */
+       assert(p->queued_ref_cnt>0);
+       p->queued_ref_cnt--;
+
+       pctx = talloc_get_type(conn->ctx->internal, struct ibw_ctx_priv);
+       msg_size = (p->queued_ref_cnt) ? pctx->opts.recv_bufsize : p->queued_rlen;
+
+       assert(p->queued_msg!=NULL);
+       assert(msg_size!=0);
+
+       DEBUG(DEBUG_DEBUG, ("ibw_process_queue refcnt=%d msgsize=%u\n",
+               p->queued_ref_cnt, msg_size));
+
+       rc = ibw_send_packet(conn, p->queued_msg, p, msg_size);
+
+       /* was this the last fragment? */
+       if (p->queued_ref_cnt) {
+               p->queued_msg += pctx->opts.recv_bufsize;
+       } else {
+               DLIST_REMOVE2(pconn->queue, p, qprev, qnext);
+               p->queued_msg = NULL;
+       }
+
+       return rc;
+}
+
+static int ibw_wc_send(struct ibw_conn *conn, struct ibv_wc *wc)
+{
+       struct ibw_ctx_priv *pctx = talloc_get_type(conn->ctx->internal, struct ibw_ctx_priv);
+       struct ibw_conn_priv *pconn = talloc_get_type(conn->internal, struct ibw_conn_priv);
+       struct ibw_wr   *p;
+       int     send_index;
+
+       DEBUG(DEBUG_DEBUG, ("ibw_wc_send(cmid: %p, wr_id: %u, bl: %u)\n",
+               pconn->cm_id, (uint32_t)wc->wr_id, (uint32_t)wc->byte_len));
+
+       assert(pconn->cm_id->qp->qp_num==wc->qp_num);
+       assert(wc->wr_id >= pctx->opts.max_recv_wr);
+       send_index = wc->wr_id - pctx->opts.max_recv_wr;
+       pconn->wr_sent--;
+
+       if (send_index < pctx->opts.max_send_wr) {
+               DEBUG(DEBUG_DEBUG, ("ibw_wc_send#1 %u\n", (int)wc->wr_id));
+               p = pconn->wr_index[send_index];
+               if (p->buf_large!=NULL) {
+                       if (p->ref_cnt) {
+                               /* awaiting more of it... */
+                               p->ref_cnt--;
+                       } else {
+                               ibw_free_mr(&p->buf_large, &p->mr_large);
+                               DLIST_REMOVE(pconn->wr_list_used, p);
+                               DLIST_ADD(pconn->wr_list_avail, p);
+                       }
+               } else { /* nasty - but necessary */
+                       DLIST_REMOVE(pconn->wr_list_used, p);
+                       DLIST_ADD(pconn->wr_list_avail, p);
+               }
+       } else { /* "extra" request - not optimized */
+               DEBUG(DEBUG_DEBUG, ("ibw_wc_send#2 %u\n", (int)wc->wr_id));
+               for(p=pconn->extra_sent; p!=NULL; p=p->next)
+                       if ((p->wr_id + pctx->opts.max_recv_wr)==(int)wc->wr_id)
+                               break;
+               if (p==NULL) {
+                       sprintf(ibw_lasterr, "failed to find wr_id %d\n", (int)wc->wr_id);
+                               return -1;
+               }
+               if (p->ref_cnt) {
+                       p->ref_cnt--;
+               } else {
+                       ibw_free_mr(&p->buf_large, &p->mr_large);
+                       DLIST_REMOVE(pconn->extra_sent, p);
+                       DLIST_ADD(pconn->extra_avail, p);
+               }
+       }
+
+       return ibw_process_queue(conn);
+}
+
+static int ibw_append_to_part(struct ibw_conn_priv *pconn,
+       struct ibw_part *part, char **pp, uint32_t add_len, int info)
+{
+       DEBUG(DEBUG_DEBUG, ("ibw_append_to_part: cmid=%p, (bs=%u, len=%u, tr=%u), al=%u, i=%u\n",
+               pconn->cm_id, part->bufsize, part->len, part->to_read, add_len, info));
+
+       /* allocate more if necessary - it's an "evergrowing" buffer... */
+       if (part->len + add_len > part->bufsize) {
+               if (part->buf==NULL) {
+                       assert(part->len==0);
+                       part->buf = talloc_size(pconn, add_len);
+                       if (part->buf==NULL) {
+                               sprintf(ibw_lasterr, "recv talloc_size error (%u) #%d\n",
+                                       add_len, info);
+                               return -1;
+                       }
+                       part->bufsize = add_len;
+               } else {
+                       part->buf = talloc_realloc_size(pconn,
+                               part->buf, part->len + add_len);
+                       if (part->buf==NULL) {
+                               sprintf(ibw_lasterr, "recv realloc error (%u + %u) #%d\n",
+                                       part->len, add_len, info);
+                               return -1;
+                       }
+               }
+               part->bufsize = part->len + add_len;
+       }
+
+       /* consume pp */
+       memcpy(part->buf + part->len, *pp, add_len);
+       *pp += add_len;
+       part->len += add_len;
+       part->to_read -= add_len;
+
+       return 0;
+}
+
+static int ibw_wc_mem_threshold(struct ibw_conn_priv *pconn,
+       struct ibw_part *part, uint32_t threshold)
+{
+       DEBUG(DEBUG_DEBUG, ("ibw_wc_mem_threshold: cmid=%p, (bs=%u, len=%u, tr=%u), thr=%u\n",
+               pconn->cm_id, part->bufsize, part->len, part->to_read, threshold));
+
+       if (part->bufsize > threshold) {
+               DEBUG(DEBUG_DEBUG, ("ibw_wc_mem_threshold: cmid=%p, %u > %u\n",
+                       pconn->cm_id, part->bufsize, threshold));
+               talloc_free(part->buf);
+               part->buf = talloc_size(pconn, threshold);
+               if (part->buf==NULL) {
+                       sprintf(ibw_lasterr, "talloc_size failed\n");
+                       return -1;
+               }
+               part->bufsize = threshold;
+       }
+       return 0;
+}
+
+static int ibw_wc_recv(struct ibw_conn *conn, struct ibv_wc *wc)
+{
+       struct ibw_ctx_priv *pctx = talloc_get_type(conn->ctx->internal, struct ibw_ctx_priv);
+       struct ibw_conn_priv *pconn = talloc_get_type(conn->internal, struct ibw_conn_priv);
+       struct ibw_part *part = &pconn->part;
+       char    *p;
+       uint32_t        remain = wc->byte_len;
+
+       DEBUG(DEBUG_DEBUG, ("ibw_wc_recv: cmid=%p, wr_id: %u, bl: %u\n",
+               pconn->cm_id, (uint32_t)wc->wr_id, remain));
+
+       assert(pconn->cm_id->qp->qp_num==wc->qp_num);
+       assert((int)wc->wr_id < pctx->opts.max_recv_wr);
+       assert(wc->byte_len <= pctx->opts.recv_bufsize);
+
+       p = pconn->buf_recv + ((int)wc->wr_id * pctx->opts.recv_bufsize);
+
+       while(remain) {
+               /* here always true: (part->len!=0 && part->to_read!=0) ||
+                       (part->len==0 && part->to_read==0) */
+               if (part->len) { /* is there a partial msg to be continued? */
+                       int read_len = (part->to_read<=remain) ? part->to_read : remain;
+                       if (ibw_append_to_part(pconn, part, &p, read_len, 421))
+                               goto error;
+                       remain -= read_len;
+
+                       if (part->len<=sizeof(uint32_t) && part->to_read==0) {
+                               assert(part->len==sizeof(uint32_t));
+                               /* set it again now... */
+                               part->to_read = *((uint32_t *)(part->buf)); /* TODO: ntohl */
+                               if (part->to_read<sizeof(uint32_t)) {
+                                       sprintf(ibw_lasterr, "got msglen=%u #2\n", part->to_read);
+                                       goto error;
+                               }
+                               part->to_read -= sizeof(uint32_t); /* it's already read */
+                       }
+
+                       if (part->to_read==0) {
+                               if (pctx->receive_func(conn, part->buf, part->len) != 0) {
+                                       goto error;
+                               }
+                               part->len = 0; /* tells not having partial data (any more) */
+                               if (ibw_wc_mem_threshold(pconn, part, pctx->opts.recv_threshold))
+                                       goto error;
+                       }
+               } else {
+                       if (remain>=sizeof(uint32_t)) {
+                               uint32_t msglen = *(uint32_t *)p; /* TODO: ntohl */
+                               if (msglen<sizeof(uint32_t)) {
+                                       sprintf(ibw_lasterr, "got msglen=%u\n", msglen);
+                                       goto error;
+                               }
+
+                               /* mostly awaited case: */
+                               if (msglen<=remain) {
+                                       if (pctx->receive_func(conn, p, msglen) != 0) {
+                                               goto error;
+                                       }
+                                       p += msglen;
+                                       remain -= msglen;
+                               } else {
+                                       part->to_read = msglen;
+                                       /* part->len is already 0 */
+                                       if (ibw_append_to_part(pconn, part, &p, remain, 422))
+                                               goto error;
+                                       remain = 0; /* to be continued ... */
+                                       /* part->to_read > 0 here */
+                               }
+                       } else { /* edge case: */
+                               part->to_read = sizeof(uint32_t);
+                               /* part->len is already 0 */
+                               if (ibw_append_to_part(pconn, part, &p, remain, 423))
+                                       goto error;
+                               remain = 0;
+                               /* part->to_read > 0 here */
+                       }
+               }
+       } /* <remain> is always decreased at least by 1 */
+
+       if (ibw_refill_cq_recv(conn))
+               goto error;
+
+       return 0;
+
+error:
+       DEBUG(DEBUG_ERR, ("ibw_wc_recv error: %s", ibw_lasterr));
+       return -1;
+}
+
+static int ibw_process_init_attrs(struct ibw_initattr *attr, int nattr, struct ibw_opts *opts)
+{
+       int     i;
+       const char *name, *value;
+
+       DEBUG(DEBUG_DEBUG, ("ibw_process_init_attrs: nattr: %d\n", nattr));
+
+       opts->max_send_wr = IBW_MAX_SEND_WR;
+       opts->max_recv_wr = IBW_MAX_RECV_WR;
+       opts->recv_bufsize = IBW_RECV_BUFSIZE;
+       opts->recv_threshold = IBW_RECV_THRESHOLD;
+
        for(i=0; i<nattr; i++) {
                name = attr[i].name;
                value = attr[i].value;
 
                assert(name!=NULL && value!=NULL);
-               if (strcmp(name, "dev_name")==0)
-                       opts->opts.dev_name = talloc_strdup(ctx, value);
-               else if (strcmp(name, "rx_depth")==0)
-                       opts->rx_depth = atoi(value);
-               else if (strcmp(name, "mtu")==0)
-                       opts->mtu = atoi(value);
+               if (strcmp(name, "max_send_wr")==0)
+                       opts->max_send_wr = atoi(value);
+               else if (strcmp(name, "max_recv_wr")==0)
+                       opts->max_recv_wr = atoi(value);
+               else if (strcmp(name, "recv_bufsize")==0)
+                       opts->recv_bufsize = atoi(value);
+               else if (strcmp(name, "recv_threshold")==0)
+                       opts->recv_threshold = atoi(value);
                else {
                        sprintf(ibw_lasterr, "ibw_init: unknown name %s\n", name);
                        return -1;
@@ -88,116 +936,430 @@ static int ibw_process_init_attrs(ibw_initattr *attr, int nattr, ibw_opts *opts)
        return 0;
 }
 
-ibw_ctx *ibw_init(ibw_initattr *attr, int nattr,
+struct ibw_ctx *ibw_init(struct ibw_initattr *attr, int nattr,
        void *ctx_userdata,
        ibw_connstate_fn_t ibw_connstate,
-       ibw_receive_fn_t ibw_receive)
+       ibw_receive_fn_t ibw_receive,
+       struct event_context *ectx)
 {
-       ibw_ctx *ctx = talloc_zero(NULL, ibw_ctx);
-       ibw_ctx_priv *pctx;
+       struct ibw_ctx *ctx = talloc_zero(NULL, struct ibw_ctx);
+       struct ibw_ctx_priv *pctx;
        int     rc;
-       ibw_event_ud *event_priv;
 
+       DEBUG(DEBUG_DEBUG, ("ibw_init(ctx_userdata: %p, ectx: %p)\n", ctx_userdata, ectx));
+
+       /* initialize basic data structures */
        memset(ibw_lasterr, 0, IBW_LASTERR_BUFSIZE);
 
        assert(ctx!=NULL);
        ibw_lasterr[0] = '\0';
-       talloc_set_destructor(ctx, ibwctx_destruct);
-       ctx->userdata = userdata;
+       talloc_set_destructor(ctx, ibw_ctx_destruct);
+       ctx->ctx_userdata = ctx_userdata;
 
-       pctx = talloc_zero(ctx, ibw_ctx_priv);
+       pctx = talloc_zero(ctx, struct ibw_ctx_priv);
+       talloc_set_destructor(pctx, ibw_ctx_priv_destruct);
        ctx->internal = (void *)pctx;
        assert(pctx!=NULL);
 
        pctx->connstate_func = ibw_connstate;
        pctx->receive_func = ibw_receive;
 
-       assert((pctx->ectx = event_context_init(ctx))!=NULL);
+       pctx->ectx = ectx;
 
        /* process attributes */
-       if (ibw_process_init_attrs(attr, nattr, pctx->opts))
+       if (ibw_process_init_attrs(attr, nattr, &pctx->opts))
                goto cleanup;
 
-       /* initialize CM stuff */
+       /* init cm */
        pctx->cm_channel = rdma_create_event_channel();
        if (!pctx->cm_channel) {
-               ret = errno;
-               sprintf(ibw_lasterr, "rdma_create_event_channel error %d\n", ret);
+               sprintf(ibw_lasterr, "rdma_create_event_channel error %d\n", errno);
                goto cleanup;
        }
 
-       event_priv = talloc_zero(ctx, ibw_event_ud);
-       event_priv->ctx = ctx;
-       event_priv->id = IBWET_CM;
-
        pctx->cm_channel_event = event_add_fd(pctx->ectx, pctx,
-               pctx->cm_channel->fd, EVENT_FD_READ, ibw_process_cm_event, event_priv);
+               pctx->cm_channel->fd, EVENT_FD_READ, ibw_event_handler_cm, ctx);
 
-       rc = rdma_create_id(pctx->cm_channel, &pctx->cm_id, cb, RDMA_PS_TCP);
+#if RDMA_USER_CM_MAX_ABI_VERSION >= 2
+       rc = rdma_create_id(pctx->cm_channel, &pctx->cm_id, ctx, RDMA_PS_TCP);
+#else
+       rc = rdma_create_id(pctx->cm_channel, &pctx->cm_id, ctx);
+#endif
        if (rc) {
                rc = errno;
                sprintf(ibw_lasterr, "rdma_create_id error %d\n", rc);
                goto cleanup;
        }
-       DEBUG(10, "created cm_id %p\n", pctx->cm_id);
+       DEBUG(DEBUG_DEBUG, ("created cm_id %p\n", pctx->cm_id));
 
-       /* allocate ib memory regions */
+       pctx->pagesize = sysconf(_SC_PAGESIZE);
 
        return ctx;
-
+       /* don't put code here */
 cleanup:
+       DEBUG(DEBUG_ERR, (ibw_lasterr));
+
        if (ctx)
                talloc_free(ctx);
 
        return NULL;
 }
 
-int ibw_stop(ibw_ctx *ctx)
+int ibw_stop(struct ibw_ctx *ctx)
+{
+       struct ibw_ctx_priv *pctx = (struct ibw_ctx_priv *)ctx->internal;
+       struct ibw_conn *p;
+
+       DEBUG(DEBUG_DEBUG, ("ibw_stop\n"));
+
+       for(p=ctx->conn_list; p!=NULL; p=p->next) {
+               if (ctx->state==IBWC_ERROR || ctx->state==IBWC_CONNECTED) {
+                       if (ibw_disconnect(p))
+                               return -1;
+               }
+       }
+
+       ctx->state = IBWS_STOPPED;
+       pctx->connstate_func(ctx, NULL);
+
+       return 0;
+}
+
+int ibw_bind(struct ibw_ctx *ctx, struct sockaddr_in *my_addr)
 {
-       ibw_ctx_priv *pctx = (ibw_ctx_priv *)ctx->internal;
+       struct ibw_ctx_priv *pctx = (struct ibw_ctx_priv *)ctx->internal;
+       int     rc;
 
+       DEBUG(DEBUG_DEBUG, ("ibw_bind: addr=%s, port=%u\n",
+               inet_ntoa(my_addr->sin_addr), ntohs(my_addr->sin_port)));
+       rc = rdma_bind_addr(pctx->cm_id, (struct sockaddr *) my_addr);
+       if (rc) {
+               sprintf(ibw_lasterr, "rdma_bind_addr error %d\n", rc);
+               DEBUG(DEBUG_ERR, (ibw_lasterr));
+               return rc;
+       }
+       DEBUG(DEBUG_DEBUG, ("rdma_bind_addr successful\n"));
+
+       return 0;
 }
 
-int ibw_bind(ibw_ctx *ctx, struct sockaddr_in *my_addr)
+int ibw_listen(struct ibw_ctx *ctx, int backlog)
 {
-       ibw_ctx_priv *pctx = (ibw_ctx_priv *)ctx->internal;
+       struct ibw_ctx_priv *pctx = talloc_get_type(ctx->internal, struct ibw_ctx_priv);
+       int     rc;
+
+       DEBUG(DEBUG_DEBUG, ("ibw_listen\n"));
+       rc = rdma_listen(pctx->cm_id, backlog);
+       if (rc) {
+               sprintf(ibw_lasterr, "rdma_listen failed: %d\n", rc);
+               DEBUG(DEBUG_ERR, (ibw_lasterr));
+               return rc;
+       }
+
+       return 0;
 }
 
-int ibw_listen(ibw_ctx *ctx, int backlog)
+int ibw_accept(struct ibw_ctx *ctx, struct ibw_conn *conn, void *conn_userdata)
 {
-       ibw_ctx_priv *pctx = (ibw_ctx_priv *)ctx->internal;
+       struct ibw_conn_priv *pconn = talloc_get_type(conn->internal, struct ibw_conn_priv);
+       struct rdma_conn_param  conn_param;
+       int     rc;
+
+       DEBUG(DEBUG_DEBUG, ("ibw_accept: cmid=%p\n", pconn->cm_id));
+       conn->conn_userdata = conn_userdata;
+
+       memset(&conn_param, 0, sizeof(struct rdma_conn_param));
+       conn_param.responder_resources = 1;
+       conn_param.initiator_depth = 1;
+       rc = rdma_accept(pconn->cm_id, &conn_param);
+       if (rc) {
+               sprintf(ibw_lasterr, "rdma_accept failed %d\n", rc);
+               DEBUG(DEBUG_ERR, (ibw_lasterr));
+               return -1;;
+       }
+
+       pconn->is_accepted = 1;
+
+       /* continued at RDMA_CM_EVENT_ESTABLISHED */
+
+       return 0;
 }
 
-int ibw_accept(ibw_ctx *ctx, void *conn_userdata)
+int ibw_connect(struct ibw_conn *conn, struct sockaddr_in *serv_addr, void *conn_userdata)
 {
-       ibw_ctx_priv *pctx = (ibw_ctx_priv *)ctx->internal;
+       struct ibw_ctx_priv *pctx = talloc_get_type(conn->ctx->internal, struct ibw_ctx_priv);
+       struct ibw_conn_priv *pconn = NULL;
+       int     rc;
+
+       assert(conn!=NULL);
+
+       conn->conn_userdata = conn_userdata;
+       pconn = talloc_get_type(conn->internal, struct ibw_conn_priv);
+       DEBUG(DEBUG_DEBUG, ("ibw_connect: addr=%s, port=%u\n", inet_ntoa(serv_addr->sin_addr),
+               ntohs(serv_addr->sin_port)));
+
+       /* clean previous - probably half - initialization */
+       if (ibw_conn_priv_destruct(pconn)) {
+               DEBUG(DEBUG_ERR, ("ibw_connect/ibw_pconn_destruct failed for cm_id=%p\n", pconn->cm_id));
+               return -1;
+       }
+
+       /* init cm */
+#if RDMA_USER_CM_MAX_ABI_VERSION >= 2
+       rc = rdma_create_id(pctx->cm_channel, &pconn->cm_id, conn, RDMA_PS_TCP);
+#else
+       rc = rdma_create_id(pctx->cm_channel, &pconn->cm_id, conn);
+#endif
+       if (rc) {
+               rc = errno;
+               sprintf(ibw_lasterr, "ibw_connect/rdma_create_id error %d\n", rc);
+               talloc_free(conn);
+               return -1;
+       }
+       DEBUG(DEBUG_DEBUG, ("ibw_connect: rdma_create_id succeeded, cm_id=%p\n", pconn->cm_id));
+
+       rc = rdma_resolve_addr(pconn->cm_id, NULL, (struct sockaddr *) serv_addr, 2000);
+       if (rc) {
+               sprintf(ibw_lasterr, "rdma_resolve_addr error %d\n", rc);
+               DEBUG(DEBUG_ERR, (ibw_lasterr));
+               talloc_free(conn);
+               return -1;
+       }
+
+       /* continued at RDMA_CM_EVENT_ADDR_RESOLVED */
+
+       return 0;
 }
 
-int ibw_connect(ibw_ctx *ctx, struct sockaddr_in *serv_addr, void *conn_userdata)
+int ibw_disconnect(struct ibw_conn *conn)
 {
-       ibw_ctx_priv *pctx = (ibw_ctx_priv *)ctx->internal;
+       int     rc;
+       struct ibw_conn_priv *pconn = talloc_get_type(conn->internal, struct ibw_conn_priv);
+
+       DEBUG(DEBUG_DEBUG, ("ibw_disconnect: cmid=%p\n", pconn->cm_id));
+
+       assert(pconn!=NULL);
+
+       switch(conn->state) {
+       case IBWC_ERROR:
+               ibw_conn_priv_destruct(pconn); /* do this here right now */
+               break;
+       case IBWC_CONNECTED:
+               rc = rdma_disconnect(pconn->cm_id);
+               if (rc) {
+                       sprintf(ibw_lasterr, "ibw_disconnect failed with %d\n", rc);
+                       DEBUG(DEBUG_ERR, (ibw_lasterr));
+                       return rc;
+               }
+               break;
+       default:
+               DEBUG(DEBUG_DEBUG, ("invalid state for disconnect: %d\n", conn->state));
+               break;
+       }
+
+       return 0;
 }
 
-void ibw_disconnect(ibw_conn *conn)
+int ibw_alloc_send_buf(struct ibw_conn *conn, void **buf, void **key, uint32_t len)
 {
-       ibw_ctx_priv *pctx = (ibw_ctx_priv *)ctx->internal;
+       struct ibw_ctx_priv *pctx = talloc_get_type(conn->ctx->internal, struct ibw_ctx_priv);
+       struct ibw_conn_priv *pconn = talloc_get_type(conn->internal, struct ibw_conn_priv);
+       struct ibw_wr *p = pconn->wr_list_avail;
+
+       if (p!=NULL) {
+               DEBUG(DEBUG_DEBUG, ("ibw_alloc_send_buf#1: cmid=%p, len=%d\n", pconn->cm_id, len));
+
+               DLIST_REMOVE(pconn->wr_list_avail, p);
+               DLIST_ADD(pconn->wr_list_used, p);
+
+               if (len <= pctx->opts.recv_bufsize) {
+                       *buf = (void *)p->buf;
+               } else {
+                       p->buf_large = ibw_alloc_mr(pctx, pconn, len, &p->mr_large);
+                       if (p->buf_large==NULL) {
+                               sprintf(ibw_lasterr, "ibw_alloc_mr#1 failed\n");
+                               goto error;
+                       }
+                       *buf = (void *)p->buf_large;
+               }
+               /* p->wr_id is already filled in ibw_init_memory */
+       } else {
+               DEBUG(DEBUG_DEBUG, ("ibw_alloc_send_buf#2: cmid=%p, len=%d\n", pconn->cm_id, len));
+               /* not optimized */
+               p = pconn->extra_avail;
+               if (!p) {
+                       p = pconn->extra_avail = talloc_zero(pconn, struct ibw_wr);
+                       talloc_set_destructor(p, ibw_wr_destruct);
+                       if (p==NULL) {
+                               sprintf(ibw_lasterr, "talloc_zero failed (emax: %u)\n", pconn->extra_max);
+                               goto error;
+                       }
+                       p->wr_id = pctx->opts.max_send_wr + pconn->extra_max;
+                       pconn->extra_max++;
+                       switch(pconn->extra_max) {
+                               case 1: DEBUG(DEBUG_INFO, ("warning: queue performed\n")); break;
+                               case 10: DEBUG(DEBUG_INFO, ("warning: queue reached 10\n")); break;
+                               case 100: DEBUG(DEBUG_INFO, ("warning: queue reached 100\n")); break;
+                               case 1000: DEBUG(DEBUG_INFO, ("warning: queue reached 1000\n")); break;
+                               default: break;
+                       }
+               }
+
+               p->buf_large = ibw_alloc_mr(pctx, pconn, len, &p->mr_large);
+               if (p->buf_large==NULL) {
+                       sprintf(ibw_lasterr, "ibw_alloc_mr#2 failed\n");
+                       goto error;
+               }
+               *buf = (void *)p->buf_large;
+
+               DLIST_REMOVE(pconn->extra_avail, p);
+               /* we don't have prepared index for this, so that
+                * we will have to find this by wr_id later on */
+               DLIST_ADD(pconn->extra_sent, p);
+       }
+
+       *key = (void *)p;
+
+       return 0;
+error:
+       DEBUG(DEBUG_ERR, ("ibw_alloc_send_buf error: %s", ibw_lasterr));
+       return -1;
 }
 
-int ibw_process_event(ibw_ctx *ctx, ...)
+
+static int ibw_send_packet(struct ibw_conn *conn, void *buf, struct ibw_wr *p, uint32_t len)
 {
-       ibw_ctx_priv *pctx = (ibw_ctx_priv *)ctx->internal;
+       struct ibw_ctx_priv *pctx = talloc_get_type(conn->ctx->internal, struct ibw_ctx_priv);
+       struct ibw_conn_priv *pconn = talloc_get_type(conn->internal, struct ibw_conn_priv);
+       int     rc;
+
+       /* can we send it right now? */
+       if (pconn->wr_sent<pctx->opts.max_send_wr) {
+               struct ibv_send_wr *bad_wr;
+               struct ibv_sge list = {
+                       .addr   = (uintptr_t)buf,
+                       .length = len,
+                       .lkey   = pconn->mr_send->lkey
+               };
+               struct ibv_send_wr wr = {
+                       .wr_id      = p->wr_id + pctx->opts.max_recv_wr,
+                       .sg_list    = &list,
+                       .num_sge    = 1,
+                       .opcode     = IBV_WR_SEND,
+                       .send_flags = IBV_SEND_SIGNALED,
+               };
+
+               if (p->buf_large==NULL) {
+                       DEBUG(DEBUG_DEBUG, ("ibw_send#normal(cmid: %p, wrid: %u, n: %d)\n",
+                               pconn->cm_id, (uint32_t)wr.wr_id, len));
+               } else {
+                       DEBUG(DEBUG_DEBUG, ("ibw_send#large(cmid: %p, wrid: %u, n: %d)\n",
+                               pconn->cm_id, (uint32_t)wr.wr_id, len));
+                       list.lkey = p->mr_large->lkey;
+               }
+
+               rc = ibv_post_send(pconn->cm_id->qp, &wr, &bad_wr);
+               if (rc) {
+                       sprintf(ibw_lasterr, "ibv_post_send error %d (%d)\n",
+                               rc, pconn->wr_sent);
+                       goto error;
+               }
+
+               pconn->wr_sent++;
+
+               return rc;
+       } /* else put the request into our own queue: */
+
+       DEBUG(DEBUG_DEBUG, ("ibw_send#queued(cmid: %p, len: %u)\n", pconn->cm_id, len));
+
+       /* TODO: clarify how to continue when state==IBWC_STOPPED */
+
+       /* to be sent by ibw_wc_send */
+       /* regardless "normal" or [a part of] "large" packet */
+       if (!p->queued_ref_cnt) {
+               DLIST_ADD_END2(pconn->queue, p, struct ibw_wr *,
+                       qprev, qnext); /* TODO: optimize */
+               p->queued_msg = buf;
+       }
+       p->queued_ref_cnt++;
+       p->queued_rlen = len; /* last wins; see ibw_wc_send */
+
+       return 0;
+error:
+       DEBUG(DEBUG_ERR, (ibw_lasterr));
+       return -1;
 }
 
-int ibw_alloc_send_buf(ibw_conn *conn, void **buf, void **key, int n)
+int ibw_send(struct ibw_conn *conn, void *buf, void *key, uint32_t len)
 {
+       struct ibw_ctx_priv *pctx = talloc_get_type(conn->ctx->internal, struct ibw_ctx_priv);
+       struct ibw_wr *p = talloc_get_type(key, struct ibw_wr);
+       int     rc;
+
+       assert(len>=sizeof(uint32_t));
+       assert((*((uint32_t *)buf)==len)); /* TODO: htonl */
+
+       if (len > pctx->opts.recv_bufsize) {
+               struct ibw_conn_priv *pconn = talloc_get_type(conn->internal, struct ibw_conn_priv);
+               int     rlen = len;
+               char    *packet = (char *)buf;
+               uint32_t        recv_bufsize = pctx->opts.recv_bufsize;
+
+               DEBUG(DEBUG_DEBUG, ("ibw_send#frag(cmid: %p, buf: %p, len: %u)\n",
+                       pconn->cm_id, buf, len));
+
+               /* single threaded => no race here: */
+               assert(p->ref_cnt==0);
+               while(rlen > recv_bufsize) {
+                       rc = ibw_send_packet(conn, packet, p, recv_bufsize);
+                       if (rc)
+                               return rc;
+                       packet += recv_bufsize;
+                       rlen -= recv_bufsize;
+                       p->ref_cnt++; /* not good to have it in ibw_send_packet */
+               }
+               if (rlen) {
+                       rc = ibw_send_packet(conn, packet, p, rlen);
+                       p->ref_cnt++; /* not good to have it in ibw_send_packet */
+               }
+               p->ref_cnt--; /* for the same handling */
+       } else {
+               assert(p->ref_cnt==0);
+               assert(p->queued_ref_cnt==0);
+
+               rc = ibw_send_packet(conn, buf, p, len);
+       }
+       return rc;
 }
 
-int ibw_send(ibw_conn *conn, void *buf, void *key, int n)
+int ibw_cancel_send_buf(struct ibw_conn *conn, void *buf, void *key)
 {
+       struct ibw_ctx_priv *pctx = talloc_get_type(conn->ctx->internal, struct ibw_ctx_priv);
+       struct ibw_conn_priv *pconn = talloc_get_type(conn->internal, struct ibw_conn_priv);
+       struct ibw_wr *p = talloc_get_type(key, struct ibw_wr);
 
+       assert(p!=NULL);
+       assert(buf!=NULL);
+       assert(conn!=NULL);
+
+       if (p->buf_large!=NULL)
+               ibw_free_mr(&p->buf_large, &p->mr_large);
+
+       /* parallel case */
+       if (p->wr_id < pctx->opts.max_send_wr) {
+               DEBUG(DEBUG_DEBUG, ("ibw_cancel_send_buf#1 %u", (int)p->wr_id));
+               DLIST_REMOVE(pconn->wr_list_used, p);
+               DLIST_ADD(pconn->wr_list_avail, p);
+       } else { /* "extra" packet */
+               DEBUG(DEBUG_DEBUG, ("ibw_cancel_send_buf#2 %u", (int)p->wr_id));
+               DLIST_REMOVE(pconn->extra_sent, p);
+               DLIST_ADD(pconn->extra_avail, p);
+       }
+
+       return 0;
 }
 
-const char *ibw_getLastError()
+const char *ibw_getLastError(void)
 {
        return ibw_lasterr;
 }