drivers/infiniband/hw/hns/hns_roce_ah.c

   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 <rdma/ib_addr.h>
  35 #include <rdma/ib_cache.h>
  36 #include "hns_roce_device.h"
  37
  38 #define HNS_ROCE_PORT_NUM_SHIFT         24
  39 #define HNS_ROCE_VLAN_SL_BIT_MASK       7
  40 #define HNS_ROCE_VLAN_SL_SHIFT          13
  41
  42 struct ib_ah *hns_roce_create_ah(struct ib_pd *ibpd,
  43                                  struct rdma_ah_attr *ah_attr,
  44                                  u32 flags,
  45                                  struct ib_udata *udata)
  46 {
  47         struct hns_roce_dev *hr_dev = to_hr_dev(ibpd->device);
  48         const struct ib_gid_attr *gid_attr;
  49         struct device *dev = hr_dev->dev;
  50         struct hns_roce_ah *ah;
  51         u16 vlan_tag = 0xffff;
  52         const struct ib_global_route *grh = rdma_ah_read_grh(ah_attr);
  53         bool vlan_en = false;
  54
  55         ah = kzalloc(sizeof(*ah), GFP_ATOMIC);
  56         if (!ah)
  57                 return ERR_PTR(-ENOMEM);
  58
  59         /* Get mac address */
  60         memcpy(ah->av.mac, ah_attr->roce.dmac, ETH_ALEN);
  61
  62         gid_attr = ah_attr->grh.sgid_attr;
  63         if (is_vlan_dev(gid_attr->ndev)) {
  64                 vlan_tag = vlan_dev_vlan_id(gid_attr->ndev);
  65                 vlan_en = true;
  66         }
  67
  68         if (vlan_tag < 0x1000)
  69                 vlan_tag |= (rdma_ah_get_sl(ah_attr) &
  70                              HNS_ROCE_VLAN_SL_BIT_MASK) <<
  71                              HNS_ROCE_VLAN_SL_SHIFT;
  72
  73         ah->av.port_pd = cpu_to_be32(to_hr_pd(ibpd)->pdn |
  74                                      (rdma_ah_get_port_num(ah_attr) <<
  75                                      HNS_ROCE_PORT_NUM_SHIFT));
  76         ah->av.gid_index = grh->sgid_index;
  77         ah->av.vlan = cpu_to_le16(vlan_tag);
  78         ah->av.vlan_en = vlan_en;
  79         dev_dbg(dev, "gid_index = 0x%x,vlan = 0x%x\n", ah->av.gid_index,
  80                 ah->av.vlan);
  81
  82         if (rdma_ah_get_static_rate(ah_attr))
  83                 ah->av.stat_rate = IB_RATE_10_GBPS;
  84
  85         memcpy(ah->av.dgid, grh->dgid.raw, HNS_ROCE_GID_SIZE);
  86         ah->av.sl_tclass_flowlabel = cpu_to_le32(rdma_ah_get_sl(ah_attr) <<
  87                                                  HNS_ROCE_SL_SHIFT);
  88
  89         return &ah->ibah;
  90 }
  91
  92 int hns_roce_query_ah(struct ib_ah *ibah, struct rdma_ah_attr *ah_attr)
  93 {
  94         struct hns_roce_ah *ah = to_hr_ah(ibah);
  95
  96         memset(ah_attr, 0, sizeof(*ah_attr));
  97
  98         rdma_ah_set_sl(ah_attr, (le32_to_cpu(ah->av.sl_tclass_flowlabel) >>
  99                                  HNS_ROCE_SL_SHIFT));
 100         rdma_ah_set_port_num(ah_attr, (le32_to_cpu(ah->av.port_pd) >>
 101                                        HNS_ROCE_PORT_NUM_SHIFT));
 102         rdma_ah_set_static_rate(ah_attr, ah->av.stat_rate);
 103         rdma_ah_set_grh(ah_attr, NULL,
 104                         (le32_to_cpu(ah->av.sl_tclass_flowlabel) &
 105                          HNS_ROCE_FLOW_LABEL_MASK), ah->av.gid_index,
 106                         ah->av.hop_limit,
 107                         (le32_to_cpu(ah->av.sl_tclass_flowlabel) >>
 108                          HNS_ROCE_TCLASS_SHIFT));
 109         rdma_ah_set_dgid_raw(ah_attr, ah->av.dgid);
 110
 111         return 0;
 112 }
 113
 114 int hns_roce_destroy_ah(struct ib_ah *ah, u32 flags)
 115 {
 116         kfree(to_hr_ah(ah));
 117
 118         return 0;
 119 }