xref: /freebsd/sys/dev/mlx5/mlx5_ib/mlx5_ib_ah.c (revision 1de7b4b805ddbf2429da511c053686ac4591ed89)
1 /*-
2  * Copyright (c) 2013-2015, Mellanox Technologies, Ltd.  All rights reserved.
3  *
4  * Redistribution and use in source and binary forms, with or without
5  * modification, are permitted provided that the following conditions
6  * are met:
7  * 1. Redistributions of source code must retain the above copyright
8  *    notice, this list of conditions and the following disclaimer.
9  * 2. Redistributions in binary form must reproduce the above copyright
10  *    notice, this list of conditions and the following disclaimer in the
11  *    documentation and/or other materials provided with the distribution.
12  *
13  * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS `AS IS' AND
14  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
16  * ARE DISCLAIMED.  IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
17  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
18  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
19  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
20  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
21  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
22  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
23  * SUCH DAMAGE.
24  *
25  * $FreeBSD$
26  */
27 
28 #include "mlx5_ib.h"
29 
30 static struct ib_ah *create_ib_ah(struct mlx5_ib_dev *dev,
31 				  struct mlx5_ib_ah *ah,
32 				  struct ib_ah_attr *ah_attr,
33 				  enum rdma_link_layer ll)
34 {
35 	if (ah_attr->ah_flags & IB_AH_GRH) {
36 		memcpy(ah->av.rgid, &ah_attr->grh.dgid, 16);
37 		ah->av.grh_gid_fl = cpu_to_be32(ah_attr->grh.flow_label |
38 						(1 << 30) |
39 						ah_attr->grh.sgid_index << 20);
40 		ah->av.hop_limit = ah_attr->grh.hop_limit;
41 		ah->av.tclass = ah_attr->grh.traffic_class;
42 	}
43 
44 	ah->av.stat_rate_sl = (ah_attr->static_rate << 4);
45 
46 	if (ll == IB_LINK_LAYER_ETHERNET) {
47 		memcpy(ah->av.rmac, ah_attr->dmac, sizeof(ah_attr->dmac));
48 		ah->av.udp_sport =
49 			mlx5_get_roce_udp_sport(dev,
50 						ah_attr->port_num,
51 						ah_attr->grh.sgid_index);
52 		ah->av.stat_rate_sl |= (ah_attr->sl & 0x7) << 1;
53 	} else {
54 		ah->av.rlid = cpu_to_be16(ah_attr->dlid);
55 		ah->av.fl_mlid = ah_attr->src_path_bits & 0x7f;
56 		ah->av.stat_rate_sl |= (ah_attr->sl & 0xf);
57 	}
58 
59 	return &ah->ibah;
60 }
61 
62 struct ib_ah *mlx5_ib_create_ah(struct ib_pd *pd, struct ib_ah_attr *ah_attr)
63 {
64 	struct mlx5_ib_ah *ah;
65 	struct mlx5_ib_dev *dev = to_mdev(pd->device);
66 	enum rdma_link_layer ll;
67 
68 	ll = pd->device->get_link_layer(pd->device, ah_attr->port_num);
69 
70 	if (ll == IB_LINK_LAYER_ETHERNET && !(ah_attr->ah_flags & IB_AH_GRH))
71 		return ERR_PTR(-EINVAL);
72 
73 	ah = kzalloc(sizeof(*ah), GFP_ATOMIC);
74 	if (!ah)
75 		return ERR_PTR(-ENOMEM);
76 
77 	return create_ib_ah(dev, ah, ah_attr, ll); /* never fails */
78 }
79 
80 int mlx5_ib_query_ah(struct ib_ah *ibah, struct ib_ah_attr *ah_attr)
81 {
82 	struct mlx5_ib_ah *ah = to_mah(ibah);
83 	u32 tmp;
84 
85 	memset(ah_attr, 0, sizeof(*ah_attr));
86 
87 	tmp = be32_to_cpu(ah->av.grh_gid_fl);
88 	if (tmp & (1 << 30)) {
89 		ah_attr->ah_flags = IB_AH_GRH;
90 		ah_attr->grh.sgid_index = (tmp >> 20) & 0xff;
91 		ah_attr->grh.flow_label = tmp & 0xfffff;
92 		memcpy(&ah_attr->grh.dgid, ah->av.rgid, 16);
93 		ah_attr->grh.hop_limit = ah->av.hop_limit;
94 		ah_attr->grh.traffic_class = ah->av.tclass;
95 	}
96 	ah_attr->dlid = be16_to_cpu(ah->av.rlid);
97 	ah_attr->static_rate = ah->av.stat_rate_sl >> 4;
98 	ah_attr->sl = ah->av.stat_rate_sl & 0xf;
99 
100 	return 0;
101 }
102 
103 int mlx5_ib_destroy_ah(struct ib_ah *ah)
104 {
105 	kfree(to_mah(ah));
106 	return 0;
107 }
108