1 /*
2  * Copyright (c) 2013-2015, Mellanox Technologies. All rights reserved.
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 "mlx5_ib.h"
34 
mlx5_ah_get_udp_sport(const struct mlx5_ib_dev * dev,const struct rdma_ah_attr * ah_attr)35 static __be16 mlx5_ah_get_udp_sport(const struct mlx5_ib_dev *dev,
36 				  const struct rdma_ah_attr *ah_attr)
37 {
38 	enum ib_gid_type gid_type = ah_attr->grh.sgid_attr->gid_type;
39 	__be16 sport;
40 
41 	if ((gid_type == IB_GID_TYPE_ROCE_UDP_ENCAP) &&
42 	    (rdma_ah_get_ah_flags(ah_attr) & IB_AH_GRH) &&
43 	    (ah_attr->grh.flow_label & IB_GRH_FLOWLABEL_MASK))
44 		sport = cpu_to_be16(
45 			rdma_flow_label_to_udp_sport(ah_attr->grh.flow_label));
46 	else
47 		sport = mlx5_get_roce_udp_sport_min(dev,
48 						    ah_attr->grh.sgid_attr);
49 
50 	return sport;
51 }
52 
create_ib_ah(struct mlx5_ib_dev * dev,struct mlx5_ib_ah * ah,struct rdma_ah_init_attr * init_attr)53 static void create_ib_ah(struct mlx5_ib_dev *dev, struct mlx5_ib_ah *ah,
54 			 struct rdma_ah_init_attr *init_attr)
55 {
56 	struct rdma_ah_attr *ah_attr = init_attr->ah_attr;
57 	enum ib_gid_type gid_type;
58 
59 	if (rdma_ah_get_ah_flags(ah_attr) & IB_AH_GRH) {
60 		const struct ib_global_route *grh = rdma_ah_read_grh(ah_attr);
61 
62 		memcpy(ah->av.rgid, &grh->dgid, 16);
63 		ah->av.grh_gid_fl = cpu_to_be32(grh->flow_label |
64 						(1 << 30) |
65 						grh->sgid_index << 20);
66 		ah->av.hop_limit = grh->hop_limit;
67 		ah->av.tclass = grh->traffic_class;
68 	}
69 
70 	ah->av.stat_rate_sl = (rdma_ah_get_static_rate(ah_attr) << 4);
71 
72 	if (ah_attr->type == RDMA_AH_ATTR_TYPE_ROCE) {
73 		if (init_attr->xmit_slave)
74 			ah->xmit_port =
75 				mlx5_lag_get_slave_port(dev->mdev,
76 							init_attr->xmit_slave);
77 		gid_type = ah_attr->grh.sgid_attr->gid_type;
78 
79 		memcpy(ah->av.rmac, ah_attr->roce.dmac,
80 		       sizeof(ah_attr->roce.dmac));
81 		ah->av.udp_sport = mlx5_ah_get_udp_sport(dev, ah_attr);
82 		ah->av.stat_rate_sl |= (rdma_ah_get_sl(ah_attr) & 0x7) << 1;
83 		if (gid_type == IB_GID_TYPE_ROCE_UDP_ENCAP)
84 #define MLX5_ECN_ENABLED BIT(1)
85 			ah->av.tclass |= MLX5_ECN_ENABLED;
86 	} else {
87 		ah->av.rlid = cpu_to_be16(rdma_ah_get_dlid(ah_attr));
88 		ah->av.fl_mlid = rdma_ah_get_path_bits(ah_attr) & 0x7f;
89 		ah->av.stat_rate_sl |= (rdma_ah_get_sl(ah_attr) & 0xf);
90 	}
91 }
92 
mlx5_ib_create_ah(struct ib_ah * ibah,struct rdma_ah_init_attr * init_attr,struct ib_udata * udata)93 int mlx5_ib_create_ah(struct ib_ah *ibah, struct rdma_ah_init_attr *init_attr,
94 		      struct ib_udata *udata)
95 
96 {
97 	struct rdma_ah_attr *ah_attr = init_attr->ah_attr;
98 	struct mlx5_ib_ah *ah = to_mah(ibah);
99 	struct mlx5_ib_dev *dev = to_mdev(ibah->device);
100 	enum rdma_ah_attr_type ah_type = ah_attr->type;
101 
102 	if ((ah_type == RDMA_AH_ATTR_TYPE_ROCE) &&
103 	    !(rdma_ah_get_ah_flags(ah_attr) & IB_AH_GRH))
104 		return -EINVAL;
105 
106 	if (ah_type == RDMA_AH_ATTR_TYPE_ROCE && udata) {
107 		int err;
108 		struct mlx5_ib_create_ah_resp resp = {};
109 		u32 min_resp_len =
110 			offsetofend(struct mlx5_ib_create_ah_resp, dmac);
111 
112 		if (udata->outlen < min_resp_len)
113 			return -EINVAL;
114 
115 		resp.response_length = min_resp_len;
116 
117 		memcpy(resp.dmac, ah_attr->roce.dmac, ETH_ALEN);
118 		err = ib_copy_to_udata(udata, &resp, resp.response_length);
119 		if (err)
120 			return err;
121 	}
122 
123 	create_ib_ah(dev, ah, init_attr);
124 	return 0;
125 }
126 
mlx5_ib_query_ah(struct ib_ah * ibah,struct rdma_ah_attr * ah_attr)127 int mlx5_ib_query_ah(struct ib_ah *ibah, struct rdma_ah_attr *ah_attr)
128 {
129 	struct mlx5_ib_ah *ah = to_mah(ibah);
130 	u32 tmp;
131 
132 	memset(ah_attr, 0, sizeof(*ah_attr));
133 	ah_attr->type = ibah->type;
134 
135 	tmp = be32_to_cpu(ah->av.grh_gid_fl);
136 	if (tmp & (1 << 30)) {
137 		rdma_ah_set_grh(ah_attr, NULL,
138 				tmp & 0xfffff,
139 				(tmp >> 20) & 0xff,
140 				ah->av.hop_limit,
141 				ah->av.tclass);
142 		rdma_ah_set_dgid_raw(ah_attr, ah->av.rgid);
143 	}
144 	rdma_ah_set_dlid(ah_attr, be16_to_cpu(ah->av.rlid));
145 	rdma_ah_set_static_rate(ah_attr, ah->av.stat_rate_sl >> 4);
146 	rdma_ah_set_sl(ah_attr, ah->av.stat_rate_sl & 0xf);
147 
148 	return 0;
149 }
150