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