Limit qp resources accepted for ibv_create_qp()
    
to the limits reported in ib_query_device().
Make sure that the limits returned to the caller following
qp creation also lie within the reported device limits.
(OFED 1.3 libmlx4 commit b612592e2c43472895ccc495183aa63980d8e7a5)
    
Signed-off-by: Jack Morgenstein <jackm@dev.mellanox.co.il>

Index: libmlx4/src/qp.c
===================================================================
--- libmlx4.orig/src/qp.c	2008-06-04 08:24:45.000000000 +0300
+++ libmlx4/src/qp.c	2008-06-04 08:24:49.000000000 +0300
@@ -619,6 +619,7 @@ void mlx4_set_sq_sizes(struct mlx4_qp *q
 		       enum ibv_qp_type type)
 {
 	int wqe_size;
+	struct mlx4_context *ctx = to_mctx(qp->ibv_qp.context);
 
 	wqe_size = (1 << qp->sq.wqe_shift) - sizeof (struct mlx4_wqe_ctrl_seg);
 	switch (type) {
@@ -636,8 +637,9 @@ void mlx4_set_sq_sizes(struct mlx4_qp *q
 	}
 
 	qp->sq.max_gs	     = wqe_size / sizeof (struct mlx4_wqe_data_seg);
-	cap->max_send_sge    = qp->sq.max_gs;
-	qp->sq.max_post	     = qp->sq.wqe_cnt - qp->sq_spare_wqes;
+	cap->max_send_sge    = min(ctx->max_sge, qp->sq.max_gs);
+	qp->sq.max_post	     = min(ctx->max_qp_wr,
+				   qp->sq.wqe_cnt - qp->sq_spare_wqes);
 	cap->max_send_wr     = qp->sq.max_post;
 
 	/*
Index: libmlx4/src/verbs.c
===================================================================
--- libmlx4.orig/src/verbs.c	2008-06-04 08:24:45.000000000 +0300
+++ libmlx4/src/verbs.c	2008-06-04 08:24:49.000000000 +0300
@@ -390,12 +390,14 @@ struct ibv_qp *mlx4_create_qp(struct ibv
 	struct ibv_create_qp_resp resp;
 	struct mlx4_qp		 *qp;
 	int			  ret;
+	struct mlx4_context	 *context = to_mctx(pd->context);
+
 
 	/* Sanity check QP size before proceeding */
-	if (attr->cap.max_send_wr     > 65536 ||
-	    attr->cap.max_recv_wr     > 65536 ||
-	    attr->cap.max_send_sge    > 64    ||
-	    attr->cap.max_recv_sge    > 64    ||
+	if (attr->cap.max_send_wr     > context->max_qp_wr ||
+	    attr->cap.max_recv_wr     > context->max_qp_wr ||
+	    attr->cap.max_send_sge    > context->max_sge   ||
+	    attr->cap.max_recv_sge    > context->max_sge   ||
 	    attr->cap.max_inline_data > 1024)
 		return NULL;
 
@@ -461,8 +463,14 @@ struct ibv_qp *mlx4_create_qp(struct ibv
 		goto err_destroy;
 	pthread_mutex_unlock(&to_mctx(pd->context)->qp_table_mutex);
 
-	qp->rq.wqe_cnt = qp->rq.max_post = attr->cap.max_recv_wr;
+	qp->rq.wqe_cnt = attr->cap.max_recv_wr;
 	qp->rq.max_gs  = attr->cap.max_recv_sge;
+
+	/* adjust rq maxima to not exceed reported device maxima */
+	attr->cap.max_recv_wr = min(context->max_qp_wr, attr->cap.max_recv_wr);
+	attr->cap.max_recv_sge = min(context->max_sge, attr->cap.max_recv_sge);
+
+	qp->rq.max_post = attr->cap.max_recv_wr;
 	mlx4_set_sq_sizes(qp, &attr->cap, attr->qp_type);
 
 	qp->doorbell_qpn    = htonl(qp->ibv_qp.qp_num << 8);