/*
 * Copyright (c) 2016 Hisilicon Limited.
 *
 * 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 <linux/platform_device.h>
#include <rdma/ib_addr.h>
#include <rdma/ib_cache.h>
#include "hns_roce_device.h"

#define HNS_ROCE_PORT_NUM_SHIFT		24
#define HNS_ROCE_VLAN_SL_BIT_MASK	7
#define HNS_ROCE_VLAN_SL_SHIFT		13

struct ib_ah *hns_roce_create_ah(struct ib_pd *ibpd,
				 struct rdma_ah_attr *ah_attr,
				 struct ib_udata *udata)
{
	struct hns_roce_dev *hr_dev = to_hr_dev(ibpd->device);
	struct device *dev = &hr_dev->pdev->dev;
	struct ib_gid_attr gid_attr;
	struct hns_roce_ah *ah;
	u16 vlan_tag = 0xffff;
	struct in6_addr in6;
	const struct ib_global_route *grh = rdma_ah_read_grh(ah_attr);
	union ib_gid sgid;
	int ret;

	ah = kzalloc(sizeof(*ah), GFP_ATOMIC);
	if (!ah)
		return ERR_PTR(-ENOMEM);

	/* Get mac address */
	memcpy(&in6, grh->dgid.raw, sizeof(grh->dgid.raw));
	if (rdma_is_multicast_addr(&in6)) {
		rdma_get_mcast_mac(&in6, ah->av.mac);
	} else {
		u8 *dmac = rdma_ah_retrieve_dmac(ah_attr);

		if (!dmac) {
			kfree(ah);
			return ERR_PTR(-EINVAL);
		}
		memcpy(ah->av.mac, dmac, ETH_ALEN);
	}

	/* Get source gid */
	ret = ib_get_cached_gid(ibpd->device, rdma_ah_get_port_num(ah_attr),
				grh->sgid_index, &sgid, &gid_attr);
	if (ret) {
		dev_err(dev, "get sgid failed! ret = %d\n", ret);
		kfree(ah);
		return ERR_PTR(ret);
	}

	if (gid_attr.ndev) {
		if (is_vlan_dev(gid_attr.ndev))
			vlan_tag = vlan_dev_vlan_id(gid_attr.ndev);
		dev_put(gid_attr.ndev);
	}

	if (vlan_tag < 0x1000)
		vlan_tag |= (rdma_ah_get_sl(ah_attr) &
			     HNS_ROCE_VLAN_SL_BIT_MASK) <<
			     HNS_ROCE_VLAN_SL_SHIFT;

	ah->av.port_pd = cpu_to_be32(to_hr_pd(ibpd)->pdn |
				     (rdma_ah_get_port_num(ah_attr) <<
				     HNS_ROCE_PORT_NUM_SHIFT));
	ah->av.gid_index = grh->sgid_index;
	ah->av.vlan = cpu_to_le16(vlan_tag);
	dev_dbg(dev, "gid_index = 0x%x,vlan = 0x%x\n", ah->av.gid_index,
		ah->av.vlan);

	if (rdma_ah_get_static_rate(ah_attr))
		ah->av.stat_rate = IB_RATE_10_GBPS;

	memcpy(ah->av.dgid, grh->dgid.raw, HNS_ROCE_GID_SIZE);
	ah->av.sl_tclass_flowlabel = cpu_to_le32(rdma_ah_get_sl(ah_attr) <<
						 HNS_ROCE_SL_SHIFT);

	return &ah->ibah;
}

int hns_roce_query_ah(struct ib_ah *ibah, struct rdma_ah_attr *ah_attr)
{
	struct hns_roce_ah *ah = to_hr_ah(ibah);

	memset(ah_attr, 0, sizeof(*ah_attr));

	rdma_ah_set_sl(ah_attr, (le32_to_cpu(ah->av.sl_tclass_flowlabel) >>
				 HNS_ROCE_SL_SHIFT));
	rdma_ah_set_port_num(ah_attr, (le32_to_cpu(ah->av.port_pd) >>
				       HNS_ROCE_PORT_NUM_SHIFT));
	rdma_ah_set_static_rate(ah_attr, ah->av.stat_rate);
	rdma_ah_set_grh(ah_attr, NULL,
			(le32_to_cpu(ah->av.sl_tclass_flowlabel) &
			 HNS_ROCE_FLOW_LABLE_MASK), ah->av.gid_index,
			ah->av.hop_limit,
			(le32_to_cpu(ah->av.sl_tclass_flowlabel) >>
			 HNS_ROCE_TCLASS_SHIFT));
	rdma_ah_set_dgid_raw(ah_attr, ah->av.dgid);

	return 0;
}

int hns_roce_destroy_ah(struct ib_ah *ah)
{
	kfree(to_hr_ah(ah));

	return 0;
}