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                                  struct ib_udata *udata)
  45 {
  46         struct hns_roce_dev *hr_dev = to_hr_dev(ibpd->device);
  47         struct device *dev = &hr_dev->pdev->dev;
  48         struct ib_gid_attr gid_attr;
  49         struct hns_roce_ah *ah;
  50         u16 vlan_tag = 0xffff;
  51         struct in6_addr in6;
  52         const struct ib_global_route *grh = rdma_ah_read_grh(ah_attr);
  53         union ib_gid sgid;
  54         int ret;
  55
  56         ah = kzalloc(sizeof(*ah), GFP_ATOMIC);
  57         if (!ah)
  58                 return ERR_PTR(-ENOMEM);
  59
  60         /* Get mac address */
  61         memcpy(&in6, grh->dgid.raw, sizeof(grh->dgid.raw));
  62         if (rdma_is_multicast_addr(&in6)) {
  63                 rdma_get_mcast_mac(&in6, ah->av.mac);
  64         } else {
  65                 u8 *dmac = rdma_ah_retrieve_dmac(ah_attr);
  66
  67                 if (!dmac) {
  68                         kfree(ah);
  69                         return ERR_PTR(-EINVAL);
  70                 }
  71                 memcpy(ah->av.mac, dmac, ETH_ALEN);
  72         }
  73
  74         /* Get source gid */
  75         ret = ib_get_cached_gid(ibpd->device, rdma_ah_get_port_num(ah_attr),
  76                                 grh->sgid_index, &sgid, &gid_attr);
  77         if (ret) {
  78                 dev_err(dev, "get sgid failed! ret = %d\n", ret);
  79                 kfree(ah);
  80                 return ERR_PTR(ret);
  81         }
  82
  83         if (gid_attr.ndev) {
  84                 if (is_vlan_dev(gid_attr.ndev))
  85                         vlan_tag = vlan_dev_vlan_id(gid_attr.ndev);
  86                 dev_put(gid_attr.ndev);
  87         }
  88
  89         if (vlan_tag < 0x1000)
  90                 vlan_tag |= (rdma_ah_get_sl(ah_attr) &
  91                              HNS_ROCE_VLAN_SL_BIT_MASK) <<
  92                              HNS_ROCE_VLAN_SL_SHIFT;
  93
  94         ah->av.port_pd = cpu_to_be32(to_hr_pd(ibpd)->pdn |
  95                                      (rdma_ah_get_port_num(ah_attr) <<
  96                                      HNS_ROCE_PORT_NUM_SHIFT));
  97         ah->av.gid_index = grh->sgid_index;
  98         ah->av.vlan = cpu_to_le16(vlan_tag);
  99         dev_dbg(dev, "gid_index = 0x%x,vlan = 0x%x\n", ah->av.gid_index,
 100                 ah->av.vlan);
 101
 102         if (rdma_ah_get_static_rate(ah_attr))
 103                 ah->av.stat_rate = IB_RATE_10_GBPS;
 104
 105         memcpy(ah->av.dgid, grh->dgid.raw, HNS_ROCE_GID_SIZE);
 106         ah->av.sl_tclass_flowlabel = cpu_to_le32(rdma_ah_get_sl(ah_attr) <<
 107                                                  HNS_ROCE_SL_SHIFT);
 108
 109         return &ah->ibah;
 110 }
 111
 112 int hns_roce_query_ah(struct ib_ah *ibah, struct rdma_ah_attr *ah_attr)
 113 {
 114         struct hns_roce_ah *ah = to_hr_ah(ibah);
 115
 116         memset(ah_attr, 0, sizeof(*ah_attr));
 117
 118         rdma_ah_set_sl(ah_attr, (le32_to_cpu(ah->av.sl_tclass_flowlabel) >>
 119                                  HNS_ROCE_SL_SHIFT));
 120         rdma_ah_set_port_num(ah_attr, (le32_to_cpu(ah->av.port_pd) >>
 121                                        HNS_ROCE_PORT_NUM_SHIFT));
 122         rdma_ah_set_static_rate(ah_attr, ah->av.stat_rate);
 123         rdma_ah_set_grh(ah_attr, NULL,
 124                         (le32_to_cpu(ah->av.sl_tclass_flowlabel) &
 125                          HNS_ROCE_FLOW_LABLE_MASK), ah->av.gid_index,
 126                         ah->av.hop_limit,
 127                         (le32_to_cpu(ah->av.sl_tclass_flowlabel) >>
 128                          HNS_ROCE_TCLASS_SHIFT));
 129         rdma_ah_set_dgid_raw(ah_attr, ah->av.dgid);
 130
 131         return 0;
 132 }
 133
 134 int hns_roce_destroy_ah(struct ib_ah *ah)
 135 {
 136         kfree(to_hr_ah(ah));
 137
 138         return 0;
 139 }