Rev 37: Raw implementation done. in
http://samba.org/~tridge/psomogyi/
psomogyi at gamax.hu
psomogyi at gamax.hu
Tue Dec 12 18:09:17 GMT 2006
------------------------------------------------------------
revno: 37
revision-id: psomogyi at gamax.hu-20061212180916-0l7kmguiwpjm5nol
parent: psomogyi at gamax.hu-20061211185615-ctn1ctxak621vrhi
committer: Peter Somogyi <psomogyi at gamax.hu>
branch nick: ctdb
timestamp: Tue 2006-12-12 19:09:16 +0100
message:
Raw implementation done.
Let's start compilation...
modified:
ib/ibwrapper.c ibwrapper.c-20061204130028-0125b4f5a72f4b11
ib/ibwrapper.h ibwrapper.h-20061204130028-32755c6266dd3c49
ib/ibwrapper_internal.h ibwrapper_internal.h-20061204130028-47f0a7e658b16ca2
=== modified file 'ib/ibwrapper.c'
--- a/ib/ibwrapper.c 2006-12-11 18:56:15 +0000
+++ b/ib/ibwrapper.c 2006-12-12 18:09:16 +0000
@@ -42,33 +42,34 @@
#define IBW_LASTERR_BUFSIZE 512
static char ibw_lasterr[IBW_LASTERR_BUFSIZE];
+static void ibw_event_handler_verbs(struct event_context *ev,
+ struct fd_event *fde, uint16_t flags, void *private_data);
+
static int ibw_init_memory(ibw_conn *conn)
{
ibw_ctx_priv *pctx = talloc_get_type(conn->ctx->internal, ibw_ctx_priv);
ibw_conn_priv *pconn = talloc_get_type(conn->internal, ibw_conn_priv);
- int i, num_msg;
+ int i;
ibw_wr *p;
- /* didn't find any reason to split send & recv buffer handling */
- num_msg = pctx->opts.max_recv_wr + pctx->opts.max_send_wr;
-
- pconn->buf = memalign(pctx->page_size, pctx->opts.max_msg_size);
+ pconn->buf = memalign(pctx->page_size, pctx->max_msg_size);
if (!pconn->buf) {
sprintf(ibw_lasterr, "couldn't allocate work buf\n");
return -1;
}
- pconn->mr = ibv_reg_mr(pctx->pd, pconn->buf, pctx->opts.bufsize, IBV_ACCESS_LOCAL_WRITE);
+ pconn->mr = ibv_reg_mr(pctx->pd, pconn->buf,
+ pctx->qsize * pctx->max_msg_size, IBV_ACCESS_LOCAL_WRITE);
if (!pconn->mr) {
- sprintf(ibw_lasterr, "Couldn't allocate mr\n");
+ sprintf(ibw_lasterr, "couldn't allocate mr\n");
return -1;
}
- pconn->wr_index = talloc_size(pconn, num_msg * sizeof(ibw_wr *));
+ pconn->wr_index = talloc_size(pconn, pctx->qsize * sizeof(ibw_wr *));
- for(i=0; i<num_msg; i++) {
+ for(i=0; i<pctx->qsize; i++) {
p = pconn->wr_index[i] = talloc_zero(pconn, ibw_wr);
- p->msg = pconn->buf + (i * pconn->opts.max_msg_size);
+ p->msg = pconn->buf + (i * pctx->max_msg_size);
p->wr_id = i;
DLIST_ADD(pconn->mr_list_avail, p);
@@ -82,17 +83,6 @@
ibw_ctx *pctx = talloc_get_type(ctx->internal, ibw_ctx_priv);
assert(pctx!=NULL);
- if (pctx->verbs_channel) {
- ibv_destroy_comp_channel(pctx->verbs_channel);
- pctx->verbs_channel = NULL;
- }
-
- if (pctx->verbs_channel_event) {
- /* TODO: do we have to do this here? */
- talloc_free(pctx->verbs_channel_event);
- pctx->verbs_channel_event = NULL;
- }
-
if (pctx->pd) {
ibv_dealloc_pd(pctx->pd);
pctx->pd = NULL;
@@ -149,6 +139,15 @@
ibv_destroy_cq(pconn->cq);
pconn->cq = NULL;
}
+ if (pconn->verbs_channel) {
+ ibv_destroy_comp_channel(pconn->verbs_channel);
+ pconn->verbs_channel = NULL;
+ }
+ if (pconn->verbs_channel_event) {
+ /* TODO: do we have to do this here? */
+ talloc_free(pconn->verbs_channel_event);
+ pconn->verbs_channel_event = NULL;
+ }
if (pconn->cm_id) {
rdma_destroy_id(pctx->cm_id);
pctx->cm_id = NULL;
@@ -195,30 +194,44 @@
struct ibv_qp_init_attr init_attr;
int rc;
+ /* init mr */
if (ibw_init_memory(conn))
return -1;
- pctx->cq = ibv_create_cq(conn->cm_id->verbs, pctx->opts.max_send_wr + pctx->opts.max_recv_wr,
- ctx, ctx->verbs_channel, 0);
+ /* 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);
+ goto cleanup;
+ }
+ DEBUG(10, "created channel %p\n", pconn->channel);
+
+ pconn->verbs_channel_event = event_add_fd(pctx->ectx, conn,
+ pconn->verbs_channel->fd, EVENT_FD_READ, ibw_event_handler_verbs, conn);
+
+ /* init cq */
+ pconn->cq = ibv_create_cq(conn->cm_id->verbs, pctx->qsize,
+ conn, pconn->verbs_channel, 0);
if (cq==NULL) {
sprintf(ibw_lasterr, "ibv_create_cq failed\n");
return -1;
}
- rc = ibv_req_notify_cq(pctx->cq, 0);
+ 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 = ctx->cq;
- init_attr.recv_cq = ctx->cq;
+ init_attr.send_cq = pconn->cq;
+ init_attr.recv_cq = pconn->cq;
rc = rdma_create_qp(conn->cm_id, pctx->pd, &init_attr);
if (rc) {
@@ -230,8 +243,83 @@
return rc;
}
-static void ibw_refill_cq(ibw_conn *conn)
-{
+static int ibw_refill_cq_recv(ibw_conn *conn)
+{
+ ibw_ctx_priv *pctx = talloc_get_type(conn->ctx->internal, ibw_ctx_priv);
+ ibw_conn_priv *pconn = talloc_get_type(conn->internal, ibw_conn_priv);
+ int i, rc;
+ struct ibv_sge list = {
+ .addr = (uintptr_t) NULL,
+ .length = pctx->max_msg_size,
+ .lkey = pconn->mr->lkey
+ };
+ struct ibv_recv_wr wr = {
+ .wr_id = 0,
+ .sg_list = &list,
+ .num_sge = 1,
+ };
+ struct ibv_recv_wr *bad_wr;
+ ibw_wr *p = pconn->wr_list_avail;
+
+ if (p==NULL) {
+ sprintf(ibw_last_err, "out of wr_list_avail");
+ DEBUG(0, ibw_last_err);
+ return -1;
+ }
+ DLIST_REMOVE(pconn->wr_list_avail, p);
+ DLIST_ADD(pconn->wr_list_used, p);
+ list.addr = p->msg;
+ wr.wr_id = p->wr_id;
+
+ rc = ibv_post_recv(pconn->qp, &wr, &bad_wr);
+ if (rc) {
+ sprintf(ibw_lasterr, "ibv_post_recv failed with %d\n", rc);
+ DEBUG(0, ibw_last_err);
+ return -2;
+ }
+
+ return 0;
+}
+
+static int ibw_fill_cq(ibw_conn *conn)
+{
+ ibw_ctx_priv *pctx = talloc_get_type(conn->ctx->internal, ibw_ctx_priv);
+ ibw_conn_priv *pconn = talloc_get_type(conn->internal, ibw_conn_priv);
+ int i, rc;
+ struct ibv_sge list = {
+ .addr = (uintptr_t) NULL,
+ .length = pctx->max_msg_size,
+ .lkey = pconn->mr->lkey
+ };
+ struct ibv_recv_wr wr = {
+ .wr_id = 0,
+ .sg_list = &list,
+ .num_sge = 1,
+ };
+ struct ibv_recv_wr *bad_wr;
+ ibw_wr *p;
+
+ for(i = pctx->opts.max_recv_wr; i!=0; i--) {
+ p = pconn->wr_list_avail;
+ if (p==NULL) {
+ sprintf(ibw_last_err, "out of wr_list_avail");
+ DEBUG(0, ibw_last_err);
+ return -1;
+ }
+ DLIST_REMOVE(pconn->wr_list_avail, p);
+ DLIST_ADD(pconn->wr_list_used, p);
+ list.addr = p->msg;
+ wr.wr_id = p->wr_id;
+
+ rc = ibv_post_recv(pconn->qp, &wr, &bad_wr);
+ if (rc) {
+ sprintf(ibw_lasterr, "ibv_post_recv failed with %d\n", rc);
+ DEBUG(0, ibw_last_err);
+ return -2;
+ }
+ }
+
+ return 0;
}
static int ibw_manage_connect(ibw_conn *conn, struct rdma_cm_id *cma_id)
@@ -266,7 +354,6 @@
ibw_conn_priv *pconn = NULL;
struct rdma_cm_id *cma_id = NULL;
struct rdma_cm_event *event = NULL;
- int error = 0;
assert(ctx!=NULL);
@@ -274,8 +361,7 @@
if (rc) {
ctx->state = IBWS_ERROR;
sprintf(ibw_lasterr, "rdma_get_cm_event error %d\n", rc);
- DEBUG(0, ibw_lasterr);
- return;
+ goto error;
}
cma_id = event->id;
@@ -291,7 +377,7 @@
if (rc) {
ctx->state = ERROR;
sprintf(ibw_lasterr, "rdma_resolve_route error %d\n", rc);
- DEBUG(0, ibw_lasterr);
+ goto error;
}
/* continued at RDMA_CM_EVENT_ROUTE_RESOLVED */
break;
@@ -300,12 +386,13 @@
/* after RDMA_CM_EVENT_ADDR_RESOLVED: */
assert(pctx->state==IWINT_ADDR_RESOLVED);
pctx->state = IWINT_ROUTE_RESOLVED;
+ assert(cma_id->context!=NULL);
conn = talloc_get_type(cma_id->context, ibw_conn);
pconn = talloc_get_type(conn->internal, ibw_conn_priv);
rc = ibw_manage_connect(conn, cma_id);
if (rc)
- error = 1;
+ goto error;
break;
@@ -318,7 +405,6 @@
DEBUG(10, "pconn->cm_id %p\n", pconn->cm_id);
conn->state = IBWC_INIT;
-
pctx->connstate_func(ctx, conn);
/* continued at ibw_accept when invoked by the func above */
@@ -327,7 +413,7 @@
DEBUG(10, "pconn->cm_id %p wasn't accepted\n", pconn->cm_id);
} else {
if (ibw_setup_cq_qp(ctx, conn))
- error = 1;
+ goto error;
}
/* TODO: clarify whether if it's needed by upper layer: */
@@ -356,9 +442,8 @@
case RDMA_CM_EVENT_CONNECT_ERROR:
case RDMA_CM_EVENT_UNREACHABLE:
case RDMA_CM_EVENT_REJECTED:
- DEBUG(0, "cma event %d, error %d\n", event->event, event->status);
- error = 1;
- break;
+ sprintf(ibw_lasterr, "cma event %d, error %d\n", event->event, event->status);
+ goto error;
case RDMA_CM_EVENT_DISCONNECTED:
if (cma_id!=ctx->cm_id) {
@@ -369,6 +454,7 @@
talloc_free(conn);
+ /* if we are the last... */
if (ctx->conn_list==NULL)
rdma_disconnect(ctx->cm_id);
} else {
@@ -380,41 +466,106 @@
break;
case RDMA_CM_EVENT_DEVICE_REMOVAL:
- DEBUG(0, "cma detected device removal!\n");
- error = 1;
- break;
+ sprintf(ibw_lasterr, "cma detected device removal!\n");
+ goto error;
default:
- DEBUG(0, "unknown event %d\n", event->event);
- error = 1;
- break;
- }
-
- if (error) {
- DEBUG(0, ibw_lasterr);
- if (cma_id!=ctx->cm_id) {
- conn = talloc_get_type(cma_id->context, ibw_conn);
- conn->state = IBWC_ERROR;
- pctx->connstate_func(NULL, conn);
- } else {
- ctx->state = IBWS_ERROR;
- pctx->connstate_func(ctx, NULL);
- }
+ sprintf(ibw_lasterr, "unknown event %d\n", event->event);
+ goto error;
}
if ((rc=rdma_ack_cm_event(event))) {
sprintf(ibw_lasterr, "rdma_ack_cm_event failed with %d\n");
- DEBUG(0, ibw_lasterr, rc);
+ goto error;
+ }
+
+ return;
+error:
+ DEBUG(0, "cm event handler: %s", ibw_lasterr);
+ if (cma_id!=ctx->cm_id) {
+ conn = talloc_get_type(cma_id->context, ibw_conn);
+ if (conn)
+ conn->state = IBWC_ERROR;
+ pctx->connstate_func(NULL, conn);
+ } else {
+ ctx->state = IBWS_ERROR;
+ pctx->connstate_func(ctx, NULL);
}
}
static void ibw_event_handler_verbs(struct event_context *ev,
struct fd_event *fde, uint16_t flags, void *private_data)
{
- ibw_ctx *ctx = talloc_get_type(private_data, ibw_ctx);
- ibw_ctx_priv *pctx = talloc_get_type(ctx->internal, ibw_ctx_priv);
-
-
+ ibw_ctx *conn = talloc_get_type(private_data, ibw_conn);
+ ibw_ctx_priv *pconn = talloc_get_type(conn->internal, ibw_ctx_priv);
+ ibw_ctx *pctx = talloc_get_type(conn->ctx->internal, ibw_ctx_priv);
+
+ struct ibv_wc wc;
+ int rc;
+
+ rc = ibv_poll_cq(conn->cq, 1, &wc);
+ if (rc!=1) {
+ sprintf(ibw_lasterr, "ibv_poll_cq error %d\n", rc);
+ goto error;
+ }
+ if (wc.status) {
+ sprintf(ibw_lasterr, "cq completion failed status %d\n",
+ wc.status);
+ goto error;
+ }
+
+ switch(wc.opcode) {
+ case IBV_WC_SEND:
+ {
+ ibw_wr *p;
+
+ DEBUG(10, "send completion\n");
+ assert(pconn->qp->qp_num==wc.qp_num);
+ assert(wc.wr_id < pctx->qsize);
+ p = pconn->wr_index[wc.wr_id];
+ DLIST_REMOVE(pconn->wr_list_used, p);
+ DLIST_ADD(pconn->wr_list_avail, p);
+ }
+ break;
+
+ case IBV_WC_RDMA_WRITE:
+ DEBUG(10, "rdma write completion\n");
+ break;
+
+ case IBV_WC_RDMA_READ:
+ DEBUG(10, "rdma read completion\n");
+ break;
+
+ case IBV_WC_RECV:
+ {
+ ibw_wr *p;
+
+ assert(pconn->qp->qp_num==wc.qp_num);
+ assert(wc.wr_id < pctx->qsize);
+ p = pconn->wr_index[wc.wr_id];
+
+ DLIST_REMOVE(pconn->wr_list_used, p);
+ DLIST_ADD(pconn->wr_list_avail, p);
+
+ DEBUG(10, "recv completion\n");
+ assert(wc.byte_len <= pctx->max_msg_size);
+
+ pctx->receive_func(conn, p->msg, wc.byte_len);
+ if (ibw_refill_cq_recv(conn))
+ goto error;
+ }
+ break;
+
+ default:
+ sprintf(ibw_lasterr, "unknown completion %d\n", wc.opcode);
+ goto error;
+ }
+
+ return;
+error:
+ DEBUG(0, ibw_lasterr);
+ conn->status = IBWC_ERROR;
+ pctx->connstate_func(NULL, conn);
}
static int ibw_process_init_attrs(ibw_initattr *attr, int nattr, ibw_opts *opts)
@@ -424,7 +575,6 @@
opts->max_send_wr = 256;
opts->max_recv_wr = 1024;
- opts->max_msg_size = 1024;
for(i=0; i<nattr; i++) {
name = attr[i].name;
@@ -435,8 +585,6 @@
opts->max_send_wr = atoi(value);
else if (strcmp(name, "max_recv_wr")==0)
opts->max_recv_wr = atoi(value);
- else if (strcmp(name, "max_msg_size")==0)
- opts->bufsize = atoi(value);
else {
sprintf(ibw_lasterr, "ibw_init: unknown name %s\n", name);
return -1;
@@ -449,7 +597,8 @@
void *ctx_userdata,
ibw_connstate_fn_t ibw_connstate,
ibw_receive_fn_t ibw_receive,
- event_content *ectx)
+ event_content *ectx,
+ int max_msg_size)
{
ibw_ctx *ctx = talloc_zero(NULL, ibw_ctx);
ibw_ctx_priv *pctx;
@@ -487,7 +636,7 @@
pctx->cm_channel_event = event_add_fd(pctx->ectx, pctx,
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);
+ rc = rdma_create_id(pctx->cm_channel, &pctx->cm_id, ctx, RDMA_PS_TCP);
if (rc) {
rc = errno;
sprintf(ibw_lasterr, "rdma_create_id error %d\n", rc);
@@ -503,17 +652,9 @@
}
DEBUG(10, "created pd %p\n", pctx->pd);
- pctx->verbs_channel = ibv_create_comp_channel(cm_id->verbs);
- if (!pctx->verbs_channel) {
- sprintf(ibw_lasterr, "ibv_create_comp_channel failed %d\n", errno);
- goto cleanup;
- }
- DEBUG(10, "created channel %p\n", pctx->channel);
-
- pctx->verbs_channel_event = event_add_fd(pctx->ectx, pctx,
- pctx->verbs_channel->fd, EVENT_FD_READ, ibw_event_handler_verbs, ctx);
-
pctx->pagesize = sysconf(_SC_PAGESIZE);
+ pctx->qsize = pctx->opts.max_send_wr + pctx->opts.max_recv_wr;
+ pctx->max_msg_size = max_msg_size;
return ctx;
/* don't put code here */
@@ -529,7 +670,16 @@
int ibw_stop(ibw_ctx *ctx)
{
ibw_ctx_priv *pctx = (ibw_ctx_priv *)ctx->internal;
-
+ ibw_conn *p;
+
+ 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;
+ }
+ }
+
+ return 0;
}
int ibw_bind(ibw_ctx *ctx, struct sockaddr_in *my_addr)
@@ -633,7 +783,7 @@
return 0;
}
-int ibw_alloc_send_buf(ibw_conn *conn, void **buf, void **key, int *maxsize)
+int ibw_alloc_send_buf(ibw_conn *conn, void **buf, void **key)
{
ibw_conn_priv *pconn = talloc_get_type(conn->internal, ibw_conn_priv);
ibw_ctx_priv *pctx = talloc_get_type(conn->ctx->internal, ibw_ctx_priv);
@@ -644,8 +794,6 @@
return -1;
}
- *maxsize = pctx->opts.max_msg_size;
-
DLIST_REMOVE(pctx->wr_list_avail, p);
DLIST_ADD(pctx->wr_list_used, p);
@@ -674,8 +822,7 @@
struct ibv_send_wr *bad_wr;
assert(p->msg==(char *)buf);
-
- p->conn = conn; /* set it only now */
+ assert(n<=pctx->max_msg_size);
return ibv_post_send(conn->qp, &wr, &bad_wr);
}
=== modified file 'ib/ibwrapper.h'
--- a/ib/ibwrapper.h 2006-12-11 18:56:15 +0000
+++ b/ib/ibwrapper.h 2006-12-12 18:09:16 +0000
@@ -87,13 +87,15 @@
/*
* settings: array of (name, value) pairs
* where name is one of:
- * dev_name [default is the first one]
- * rx_depth [default is 500]
- * mtu [default is 1024]
- * ib_port [default is 1]
+ * max_send_wr [default is 256]
+ * max_recv_wr [default is 1024]
+ * <...>
*
* Must be called _ONCE_ for each node.
*
+ * max_msg_size is the maximum size of a message
+ * (max_send_wr + max_recv_wr) * max_msg_size bytes allocated per connection
+ *
* returns non-NULL on success
*
* talloc_free must be called for the result in IBWS_STOPPED;
@@ -104,7 +106,8 @@
void *ctx_userdata,
ibw_connstate_fn_t ibw_connstate,
ibw_receive_fn_t ibw_receive,
- event_content *ectx);
+ event_content *ectx,
+ int max_msg_size);
/*
* Must be called in states of (IBWS_ERROR, IBWS_READY, IBWS_CONNECT_REQUEST)
@@ -178,16 +181,17 @@
* You have to use this buf to fill in before send.
* It's just to avoid memcpy.in ibw_send.
* Use the same (buf, key) pair with ibw_send.
- * Don't use more space than maxsize.
+ * Don't use more space than maxsize (see ibw_init).
*
* Returns 0 on success.
*/
-int ibw_alloc_send_buf(ibw_conn *conn, void **buf, void **key, int *maxsize);
+int ibw_alloc_send_buf(ibw_conn *conn, void **buf, void **key);
/*
* Send the message in one
* Can be invoked any times (should fit into buffers) and at any time
* (in conn->state=IBWC_CONNECTED)
+ * n must be less or equal than max_msg_size (see ibw_init)
*
* You mustn't use (buf, key) any more for sending.
*/
=== modified file 'ib/ibwrapper_internal.h'
--- a/ib/ibwrapper_internal.h 2006-12-11 18:56:15 +0000
+++ b/ib/ibwrapper_internal.h 2006-12-12 18:09:16 +0000
@@ -24,12 +24,10 @@
typedef struct _ibw_opts {
int max_send_wr;
int max_recv_wr;
- int max_msg_size;
} ibw_opts;
typedef struct _ibw_wr {
- char *msg; /* initialized in ibw_init_memory once */
- ibw_conn *conn; /*valid only when in wr_list_used */
+ char *msg; /* initialized in ibw_init_memory once per connection */
int wr_id; /* position in wr_index list; also used as wr id */
struct _ibw_wr *next, *prev; /* in wr_list_avail or wr_list_used */
} ibw_wr;
@@ -51,28 +49,28 @@
struct rdma_event_channel *cm_channel;
struct fd_event *cm_channel_event;
- struct rdma_event_channel *cm_channel;
- struct fd_event *cm_channel_event;
- struct ibv_comp_channel *verbs_channel;
- struct fd_event *verbs_channel_event;
-
struct ibv_pd *pd;
- ibw_connstate_fn_t connstate_func;
- ibw_receive_fn_t receive_func;
+ ibw_connstate_fn_t connstate_func; /* see ibw_init */
+ ibw_receive_fn_t receive_func; /* see ibw_init */
long pagesize; /* sysconf result for memalign */
+ int qsize; /* opts.max_send_wr + opts.max_recv_wr */
+ int max_msg_size; /* see ibw_init */
} ibw_ctx_priv;
typedef struct _ibw_conn_priv {
+ struct ibv_comp_channel *verbs_channel;
+ struct fd_event *verbs_channel_event;
+
struct rdma_cm_id *cm_id; /* client's cm id */
int is_accepted;
struct ibv_cq *cq; /* qp is in cm_id */
struct ibv_mr *mr;
- char *buf; /* fixed size (opts.bufsize) buffer for send/recv */
+ char *buf; /* fixed size (qsize * opts.max_msg_size) buffer for send/recv */
ibw_wr *wr_list_avail;
ibw_wr *wr_list_used;
- ibw_wr **wr_index; /* array[0..(max_send_wr + max_recv_wr)-1] of (ibw_wr *) */
+ ibw_wr **wr_index; /* array[0..(qsize-1)] of (ibw_wr *) */
} ibw_conn_priv;
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