diff --git a/drivers/infiniband/hw/mlx4/ah.c b/drivers/infiniband/hw/mlx4/ah.c
new file mode 100644
index 0000000..c75ac94
--- /dev/null
+++ b/drivers/infiniband/hw/mlx4/ah.c
@@ -0,0 +1,100 @@
+/*
+ * Copyright (c) 2007 Cisco Systems, Inc. All rights reserved.
+ *
+ * This software is available to you under a choice of one of two
+ * licenses.  You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the
+ * OpenIB.org BSD license below:
+ *
+ *     Redistribution and use in source and binary forms, with or
+ *     without modification, are permitted provided that the following
+ *     conditions are met:
+ *
+ *      - Redistributions of source code must retain the above
+ *        copyright notice, this list of conditions and the following
+ *        disclaimer.
+ *
+ *      - Redistributions in binary form must reproduce the above
+ *        copyright notice, this list of conditions and the following
+ *        disclaimer in the documentation and/or other materials
+ *        provided with the distribution.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#include "mlx4_ib.h"
+
+struct ib_ah *mlx4_ib_create_ah(struct ib_pd *pd, struct ib_ah_attr *ah_attr)
+{
+	struct mlx4_dev *dev = to_mdev(pd->device)->dev;
+	struct mlx4_ib_ah *ah;
+
+	ah = kmalloc(sizeof *ah, GFP_ATOMIC);
+	if (!ah)
+		return ERR_PTR(-ENOMEM);
+
+	memset(&ah->av, 0, sizeof ah->av);
+
+	ah->av.port_pd = cpu_to_be32(to_mpd(pd)->pdn | (ah_attr->port_num << 24));
+	ah->av.g_slid  = ah_attr->src_path_bits;
+	ah->av.dlid    = cpu_to_be16(ah_attr->dlid);
+	if (ah_attr->static_rate) {
+		ah->av.stat_rate = ah_attr->static_rate + MLX4_STAT_RATE_OFFSET;
+		while (ah->av.stat_rate > IB_RATE_2_5_GBPS + MLX4_STAT_RATE_OFFSET &&
+		       !(1 << ah->av.stat_rate & dev->caps.stat_rate_support))
+			--ah->av.stat_rate;
+	}
+	ah->av.sl_tclass_flowlabel = cpu_to_be32(ah_attr->sl << 28);
+	if (ah_attr->ah_flags & IB_AH_GRH) {
+		ah->av.g_slid   |= 0x80;
+		ah->av.gid_index = ah_attr->grh.sgid_index;
+		ah->av.hop_limit = ah_attr->grh.hop_limit;
+		ah->av.sl_tclass_flowlabel |=
+			cpu_to_be32((ah_attr->grh.traffic_class << 20) |
+				    ah_attr->grh.flow_label);
+		memcpy(ah->av.dgid, ah_attr->grh.dgid.raw, 16);
+	}
+
+	return &ah->ibah;
+}
+
+int mlx4_ib_query_ah(struct ib_ah *ibah, struct ib_ah_attr *ah_attr)
+{
+	struct mlx4_ib_ah *ah = to_mah(ibah);
+
+	memset(ah_attr, 0, sizeof *ah_attr);
+	ah_attr->dlid	       = be16_to_cpu(ah->av.dlid);
+	ah_attr->sl	       = be32_to_cpu(ah->av.sl_tclass_flowlabel) >> 28;
+	ah_attr->port_num      = be32_to_cpu(ah->av.port_pd) >> 24;
+	if (ah->av.stat_rate)
+		ah_attr->static_rate = ah->av.stat_rate - MLX4_STAT_RATE_OFFSET;
+	ah_attr->src_path_bits = ah->av.g_slid & 0x7F;
+
+	if (mlx4_ib_ah_grh_present(ah)) {
+		ah_attr->ah_flags = IB_AH_GRH;
+
+		ah_attr->grh.traffic_class =
+			be32_to_cpu(ah->av.sl_tclass_flowlabel) >> 20;
+		ah_attr->grh.flow_label =
+			be32_to_cpu(ah->av.sl_tclass_flowlabel) & 0xfffff;
+		ah_attr->grh.hop_limit  = ah->av.hop_limit;
+		ah_attr->grh.sgid_index = ah->av.gid_index;
+		memcpy(ah_attr->grh.dgid.raw, ah->av.dgid, 16);
+	}
+
+	return 0;
+}
+
+int mlx4_ib_destroy_ah(struct ib_ah *ah)
+{
+	kfree(to_mah(ah));
+	return 0;
+}