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 <linux/pci.h>
35 #include <rdma/ib_addr.h>
36 #include <rdma/ib_cache.h>
37 #include "hns_roce_device.h"
38 
39 static inline u16 get_ah_udp_sport(const struct rdma_ah_attr *ah_attr)
40 {
41 	u32 fl = ah_attr->grh.flow_label;
42 	u16 sport;
43 
44 	if (!fl)
45 		sport = get_random_u32() %
46 			(IB_ROCE_UDP_ENCAP_VALID_PORT_MAX + 1 -
47 			 IB_ROCE_UDP_ENCAP_VALID_PORT_MIN) +
48 			IB_ROCE_UDP_ENCAP_VALID_PORT_MIN;
49 	else
50 		sport = rdma_flow_label_to_udp_sport(fl);
51 
52 	return sport;
53 }
54 
55 int hns_roce_create_ah(struct ib_ah *ibah, struct rdma_ah_init_attr *init_attr,
56 		       struct ib_udata *udata)
57 {
58 	struct rdma_ah_attr *ah_attr = init_attr->ah_attr;
59 	const struct ib_global_route *grh = rdma_ah_read_grh(ah_attr);
60 	struct hns_roce_dev *hr_dev = to_hr_dev(ibah->device);
61 	struct hns_roce_ah *ah = to_hr_ah(ibah);
62 	int ret = 0;
63 
64 	if (hr_dev->pci_dev->revision <= PCI_REVISION_ID_HIP08 && udata)
65 		return -EOPNOTSUPP;
66 
67 	ah->av.port = rdma_ah_get_port_num(ah_attr);
68 	ah->av.gid_index = grh->sgid_index;
69 
70 	if (rdma_ah_get_static_rate(ah_attr))
71 		ah->av.stat_rate = IB_RATE_10_GBPS;
72 
73 	ah->av.hop_limit = grh->hop_limit;
74 	ah->av.flowlabel = grh->flow_label;
75 	ah->av.udp_sport = get_ah_udp_sport(ah_attr);
76 	ah->av.sl = rdma_ah_get_sl(ah_attr);
77 	ah->av.tclass = get_tclass(grh);
78 
79 	memcpy(ah->av.dgid, grh->dgid.raw, HNS_ROCE_GID_SIZE);
80 	memcpy(ah->av.mac, ah_attr->roce.dmac, ETH_ALEN);
81 
82 	/* HIP08 needs to record vlan info in Address Vector */
83 	if (hr_dev->pci_dev->revision <= PCI_REVISION_ID_HIP08) {
84 		ret = rdma_read_gid_l2_fields(ah_attr->grh.sgid_attr,
85 					      &ah->av.vlan_id, NULL);
86 		if (ret)
87 			return ret;
88 
89 		ah->av.vlan_en = ah->av.vlan_id < VLAN_N_VID;
90 	}
91 
92 	return ret;
93 }
94 
95 int hns_roce_query_ah(struct ib_ah *ibah, struct rdma_ah_attr *ah_attr)
96 {
97 	struct hns_roce_ah *ah = to_hr_ah(ibah);
98 
99 	memset(ah_attr, 0, sizeof(*ah_attr));
100 
101 	rdma_ah_set_sl(ah_attr, ah->av.sl);
102 	rdma_ah_set_port_num(ah_attr, ah->av.port);
103 	rdma_ah_set_static_rate(ah_attr, ah->av.stat_rate);
104 	rdma_ah_set_grh(ah_attr, NULL, ah->av.flowlabel,
105 			ah->av.gid_index, ah->av.hop_limit, ah->av.tclass);
106 	rdma_ah_set_dgid_raw(ah_attr, ah->av.dgid);
107 
108 	return 0;
109 }
110