1 files changed, 234 insertions, 0 deletions
diff --git a/drivers/infiniband/hw/mlx4/ah.c b/drivers/infiniband/hw/mlx4/ah.c
new file mode 100644
index 000000000..7321d6ab5
--- /dev/null
+++ b/drivers/infiniband/hw/mlx4/ah.c
@@ -0,0 +1,234 @@
+/*
+ * 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 <rdma/ib_addr.h>
+#include <rdma/ib_cache.h>
+
+#include <linux/slab.h>
+#include <linux/inet.h>
+#include <linux/string.h>
+#include <linux/mlx4/driver.h>
+
+#include "mlx4_ib.h"
+
+static void create_ib_ah(struct ib_ah *ib_ah, struct rdma_ah_attr *ah_attr)
+{
+	struct mlx4_ib_ah *ah = to_mah(ib_ah);
+	struct mlx4_dev *dev = to_mdev(ib_ah->device)->dev;
+
+	ah->av.ib.port_pd = cpu_to_be32(to_mpd(ib_ah->pd)->pdn |
+			    (rdma_ah_get_port_num(ah_attr) << 24));
+	ah->av.ib.g_slid  = rdma_ah_get_path_bits(ah_attr);
+	ah->av.ib.sl_tclass_flowlabel =
+			cpu_to_be32(rdma_ah_get_sl(ah_attr) << 28);
+	if (rdma_ah_get_ah_flags(ah_attr) & IB_AH_GRH) {
+		const struct ib_global_route *grh = rdma_ah_read_grh(ah_attr);
+
+		ah->av.ib.g_slid   |= 0x80;
+		ah->av.ib.gid_index = grh->sgid_index;
+		ah->av.ib.hop_limit = grh->hop_limit;
+		ah->av.ib.sl_tclass_flowlabel |=
+			cpu_to_be32((grh->traffic_class << 20) |
+				    grh->flow_label);
+		memcpy(ah->av.ib.dgid, grh->dgid.raw, 16);
+	}
+
+	ah->av.ib.dlid = cpu_to_be16(rdma_ah_get_dlid(ah_attr));
+	if (rdma_ah_get_static_rate(ah_attr)) {
+		u8 static_rate = rdma_ah_get_static_rate(ah_attr) +
+					MLX4_STAT_RATE_OFFSET;
+
+		while (static_rate > IB_RATE_2_5_GBPS + MLX4_STAT_RATE_OFFSET &&
+		       !(1 << static_rate & dev->caps.stat_rate_support))
+			--static_rate;
+		ah->av.ib.stat_rate = static_rate;
+	}
+}
+
+static int create_iboe_ah(struct ib_ah *ib_ah, struct rdma_ah_attr *ah_attr)
+{
+	struct mlx4_ib_dev *ibdev = to_mdev(ib_ah->device);
+	struct mlx4_ib_ah *ah = to_mah(ib_ah);
+	const struct ib_gid_attr *gid_attr;
+	struct mlx4_dev *dev = ibdev->dev;
+	int is_mcast = 0;
+	struct in6_addr in6;
+	u16 vlan_tag = 0xffff;
+	const struct ib_global_route *grh = rdma_ah_read_grh(ah_attr);
+	int ret;
+
+	memcpy(&in6, grh->dgid.raw, sizeof(in6));
+	if (rdma_is_multicast_addr(&in6))
+		is_mcast = 1;
+
+	memcpy(ah->av.eth.mac, ah_attr->roce.dmac, ETH_ALEN);
+	eth_zero_addr(ah->av.eth.s_mac);
+
+	/*
+	 * If sgid_attr is NULL we are being called by mlx4_ib_create_ah_slave
+	 * and we are directly creating an AV for a slave's gid_index.
+	 */
+	gid_attr = ah_attr->grh.sgid_attr;
+	if (gid_attr) {
+		ret = rdma_read_gid_l2_fields(gid_attr, &vlan_tag,
+					      &ah->av.eth.s_mac[0]);
+		if (ret)
+			return ret;
+
+		ret = mlx4_ib_gid_index_to_real_index(ibdev, gid_attr);
+		if (ret < 0)
+			return ret;
+		ah->av.eth.gid_index = ret;
+	} else {
+		/* mlx4_ib_create_ah_slave fills in the s_mac and the vlan */
+		ah->av.eth.gid_index = ah_attr->grh.sgid_index;
+	}
+
+	if (vlan_tag < 0x1000)
+		vlan_tag |= (rdma_ah_get_sl(ah_attr) & 7) << 13;
+	ah->av.eth.port_pd = cpu_to_be32(to_mpd(ib_ah->pd)->pdn |
+					 (rdma_ah_get_port_num(ah_attr) << 24));
+	ah->av.eth.vlan = cpu_to_be16(vlan_tag);
+	ah->av.eth.hop_limit = grh->hop_limit;
+	if (rdma_ah_get_static_rate(ah_attr)) {
+		ah->av.eth.stat_rate = rdma_ah_get_static_rate(ah_attr) +
+					MLX4_STAT_RATE_OFFSET;
+		while (ah->av.eth.stat_rate > IB_RATE_2_5_GBPS + MLX4_STAT_RATE_OFFSET &&
+		       !(1 << ah->av.eth.stat_rate & dev->caps.stat_rate_support))
+			--ah->av.eth.stat_rate;
+	}
+	ah->av.eth.sl_tclass_flowlabel |=
+			cpu_to_be32((grh->traffic_class << 20) |
+				    grh->flow_label);
+	/*
+	 * HW requires multicast LID so we just choose one.
+	 */
+	if (is_mcast)
+		ah->av.ib.dlid = cpu_to_be16(0xc000);
+
+	memcpy(ah->av.eth.dgid, grh->dgid.raw, 16);
+	ah->av.eth.sl_tclass_flowlabel |= cpu_to_be32(rdma_ah_get_sl(ah_attr)
+						      << 29);
+	return 0;
+}
+
+int mlx4_ib_create_ah(struct ib_ah *ib_ah, struct rdma_ah_init_attr *init_attr,
+		      struct ib_udata *udata)
+{
+	struct rdma_ah_attr *ah_attr = init_attr->ah_attr;
+
+	if (ah_attr->type == RDMA_AH_ATTR_TYPE_ROCE) {
+		if (!(rdma_ah_get_ah_flags(ah_attr) & IB_AH_GRH))
+			return -EINVAL;
+		/*
+		 * TBD: need to handle the case when we get
+		 * called in an atomic context and there we
+		 * might sleep.  We don't expect this
+		 * currently since we're working with link
+		 * local addresses which we can translate
+		 * without going to sleep.
+		 */
+		return create_iboe_ah(ib_ah, ah_attr);
+	}
+
+	create_ib_ah(ib_ah, ah_attr);
+	return 0;
+}
+
+int mlx4_ib_create_ah_slave(struct ib_ah *ah, struct rdma_ah_attr *ah_attr,
+			    int slave_sgid_index, u8 *s_mac, u16 vlan_tag)
+{
+	struct rdma_ah_attr slave_attr = *ah_attr;
+	struct rdma_ah_init_attr init_attr = {};
+	struct mlx4_ib_ah *mah = to_mah(ah);
+	int ret;
+
+	slave_attr.grh.sgid_attr = NULL;
+	slave_attr.grh.sgid_index = slave_sgid_index;
+	init_attr.ah_attr = &slave_attr;
+	ret = mlx4_ib_create_ah(ah, &init_attr, NULL);
+	if (ret)
+		return ret;
+
+	ah->type = ah_attr->type;
+
+	/* get rid of force-loopback bit */
+	mah->av.ib.port_pd &= cpu_to_be32(0x7FFFFFFF);
+
+	if (ah_attr->type == RDMA_AH_ATTR_TYPE_ROCE)
+		memcpy(mah->av.eth.s_mac, s_mac, 6);
+
+	if (vlan_tag < 0x1000)
+		vlan_tag |= (rdma_ah_get_sl(ah_attr) & 7) << 13;
+	mah->av.eth.vlan = cpu_to_be16(vlan_tag);
+
+	return 0;
+}
+
+int mlx4_ib_query_ah(struct ib_ah *ibah, struct rdma_ah_attr *ah_attr)
+{
+	struct mlx4_ib_ah *ah = to_mah(ibah);
+	int port_num = be32_to_cpu(ah->av.ib.port_pd) >> 24;
+
+	memset(ah_attr, 0, sizeof *ah_attr);
+	ah_attr->type = ibah->type;
+
+	if (ah_attr->type == RDMA_AH_ATTR_TYPE_ROCE) {
+		rdma_ah_set_dlid(ah_attr, 0);
+		rdma_ah_set_sl(ah_attr,
+			       be32_to_cpu(ah->av.eth.sl_tclass_flowlabel)
+			       >> 29);
+	} else {
+		rdma_ah_set_dlid(ah_attr, be16_to_cpu(ah->av.ib.dlid));
+		rdma_ah_set_sl(ah_attr,
+			       be32_to_cpu(ah->av.ib.sl_tclass_flowlabel)
+			       >> 28);
+	}
+
+	rdma_ah_set_port_num(ah_attr, port_num);
+	if (ah->av.ib.stat_rate)
+		rdma_ah_set_static_rate(ah_attr,
+					ah->av.ib.stat_rate -
+					MLX4_STAT_RATE_OFFSET);
+	rdma_ah_set_path_bits(ah_attr, ah->av.ib.g_slid & 0x7F);
+	if (mlx4_ib_ah_grh_present(ah)) {
+		u32 tc_fl = be32_to_cpu(ah->av.ib.sl_tclass_flowlabel);
+
+		rdma_ah_set_grh(ah_attr, NULL,
+				tc_fl & 0xfffff, ah->av.ib.gid_index,
+				ah->av.ib.hop_limit,
+				tc_fl >> 20);
+		rdma_ah_set_dgid_raw(ah_attr, ah->av.ib.dgid);
+	}
+
+	return 0;
+}