Don't call ibv_qp_to_qp_ex when hardware does not support extended QP

The sizeof 'struct ibv_qp' allocated by ibv_create_qp is 160.
If the memory holds the 'struct ibv_qp' was allocated at the
upper boundary of a memory page, cast it to 'struct verbs_qp',
whose size is 360, may across the memory page boundary. It will
trigger invalid memory access to the next memory page.

The issue can be reproduced with OPA and QIB HCA.

For example run over OPA:
 Server Node: $ ib_read_bw -F -N -n 1000 -u 20 -q 257 -s 4194304
 Client Node: $ ib_read_bw -F -N -n 1000 -u 20 -q 257 -s 4194304 <sever>

 Program received signal SIGSEGV, Segmentation fault.
 ibv_qp_to_qp_ex (qp=0x5555557a5f10) at libibverbs/verbs.c:624
 624             if (vqp->comp_mask & VERBS_QP_EX)
 (gdb) bt
 #0  ibv_qp_to_qp_ex (qp=0x5555557a5f10) at libibverbs/verbs.c:624
 #1  0x000055555556af4a in create_reg_qp_main (ctx=ctx@entry=0x7fffffffd500, user_param=user_param@entry=0x7fffffffd670, i=i@entry=21, num_of_qps=num_of_qps@entry=128)  at src/perftest_resources.c:1597
 #2  0x000055555556b6d7 in create_qp_main (num_of_qps=<optimized out>, i=21,  user_param=0x7fffffffd670, ctx=0x7fffffffd500) at src/perftest_resources.c:1613
 #3  ctx_init (ctx=0x7fffffffd500, user_param=0x7fffffffd670) at src/perftest_resources.c:1552
 #4  0x0000555555558e9c in main (argc=<optimized out>, argv=<optimized out>) at  src/read_bw.c:149

624             if (vqp->comp_mask & VERBS_QP_EX)
(gdb) p qp
$1 = (struct ibv_qp *) 0x5555557a5f10
(gdb) p vqp
$2 = (struct verbs_qp *) 0x5555557a5f10
(gdb) p *qp
$3 = {context = 0x55555578ad00, qp_context = 0x0, ....
(gdb) p *vqp
Cannot access memory at address 0x5555557a6000

Signed-off-by: Honggang Li <[email protected]>

src/perftest_resources.c

@@ -1649,14 +1649,16 @@ int create_reg_qp_main(struct pingpong_context *ctx,
 		return FAILURE;
 	}
 	#ifdef HAVE_IBV_WR_API
-	ctx->qpx[i] = ibv_qp_to_qp_ex(ctx->qp[i]);
-	#ifdef HAVE_MLX5DV
-	if (user_param->connection_type == DC)
-	{
-		ctx->dv_qp[i] = mlx5dv_qp_ex_from_ibv_qp_ex(ctx->qpx[i]);
+	if (!user_param->use_old_post_send) {
+		ctx->qpx[i] = ibv_qp_to_qp_ex(ctx->qp[i]);
+		#ifdef HAVE_MLX5DV
+		if (user_param->connection_type == DC)
+		{
+			ctx->dv_qp[i] = mlx5dv_qp_ex_from_ibv_qp_ex(ctx->qpx[i]);
+		}
+		#endif
 	}
 	#endif
-	#endif
 
 	return SUCCESS;
 }