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33#include "mlx5_ib.h"
34
35static __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
53static 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
93int 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
127int 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