1 /*
2  * Copyright (c) 2016 Hisilicon Limited.
3  *
4  * This software is available to you under a choice of one of two
5  * licenses.  You may choose to be licensed under the terms of the GNU
6  * General Public License (GPL) Version 2, available from the file
7  * COPYING in the main directory of this source tree, or the
8  * OpenIB.org BSD license below:
9  *
10  *     Redistribution and use in source and binary forms, with or
11  *     without modification, are permitted provided that the following
12  *     conditions are met:
13  *
14  *      - Redistributions of source code must retain the above
15  *        copyright notice, this list of conditions and the following
16  *        disclaimer.
17  *
18  *      - Redistributions in binary form must reproduce the above
19  *        copyright notice, this list of conditions and the following
20  *        disclaimer in the documentation and/or other materials
21  *        provided with the distribution.
22  *
23  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
25  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
26  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
27  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
28  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
29  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
30  * SOFTWARE.
31  */
32 
33 #include <linux/platform_device.h>
34 #include <rdma/ib_addr.h>
35 #include <rdma/ib_cache.h>
36 #include "hns_roce_device.h"
37 
38 #define HNS_ROCE_PORT_NUM_SHIFT		24
39 #define HNS_ROCE_VLAN_SL_BIT_MASK	7
40 #define HNS_ROCE_VLAN_SL_SHIFT		13
41 
42 int hns_roce_create_ah(struct ib_ah *ibah, struct rdma_ah_attr *ah_attr,
43 		       u32 flags, struct ib_udata *udata)
44 {
45 	struct hns_roce_dev *hr_dev = to_hr_dev(ibah->device);
46 	const struct ib_gid_attr *gid_attr;
47 	struct device *dev = hr_dev->dev;
48 	struct hns_roce_ah *ah = to_hr_ah(ibah);
49 	u16 vlan_tag = 0xffff;
50 	const struct ib_global_route *grh = rdma_ah_read_grh(ah_attr);
51 	bool vlan_en = false;
52 	int ret;
53 
54 	gid_attr = ah_attr->grh.sgid_attr;
55 	ret = rdma_read_gid_l2_fields(gid_attr, &vlan_tag, NULL);
56 	if (ret)
57 		return ret;
58 
59 	/* Get mac address */
60 	memcpy(ah->av.mac, ah_attr->roce.dmac, ETH_ALEN);
61 
62 	if (vlan_tag < VLAN_CFI_MASK) {
63 		vlan_en = true;
64 		vlan_tag |= (rdma_ah_get_sl(ah_attr) &
65 			     HNS_ROCE_VLAN_SL_BIT_MASK) <<
66 			     HNS_ROCE_VLAN_SL_SHIFT;
67 	}
68 
69 	ah->av.port = rdma_ah_get_port_num(ah_attr);
70 	ah->av.gid_index = grh->sgid_index;
71 	ah->av.vlan = vlan_tag;
72 	ah->av.vlan_en = vlan_en;
73 	dev_dbg(dev, "gid_index = 0x%x,vlan = 0x%x\n", ah->av.gid_index,
74 		ah->av.vlan);
75 
76 	if (rdma_ah_get_static_rate(ah_attr))
77 		ah->av.stat_rate = IB_RATE_10_GBPS;
78 
79 	memcpy(ah->av.dgid, grh->dgid.raw, HNS_ROCE_GID_SIZE);
80 	ah->av.sl = rdma_ah_get_sl(ah_attr);
81 
82 	return 0;
83 }
84 
85 int hns_roce_query_ah(struct ib_ah *ibah, struct rdma_ah_attr *ah_attr)
86 {
87 	struct hns_roce_ah *ah = to_hr_ah(ibah);
88 
89 	memset(ah_attr, 0, sizeof(*ah_attr));
90 
91 	rdma_ah_set_sl(ah_attr, ah->av.sl);
92 	rdma_ah_set_port_num(ah_attr, ah->av.port);
93 	rdma_ah_set_static_rate(ah_attr, ah->av.stat_rate);
94 	rdma_ah_set_grh(ah_attr, NULL, ah->av.flowlabel,
95 			ah->av.gid_index, ah->av.hop_limit, ah->av.tclass);
96 	rdma_ah_set_dgid_raw(ah_attr, ah->av.dgid);
97 
98 	return 0;
99 }
100 
101 void hns_roce_destroy_ah(struct ib_ah *ah, u32 flags)
102 {
103 	return;
104 }
105